JPH10169953A - Starting-up operation control method of sludge incinerator and apparatus therefor and medium of fuzzy inference combustion control program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a smooth shift to the normal operation from a rising operation by a method wherein a changing rate of the temperature of a hearth at rising time per unit time obtained from the temperature of the hearth is determined as input variable and a flow rate of a furnace bottom burner auxiliary fuel or the like as output variable to perform a control for assuring a rising rate of the temperature of the hearth. SOLUTION: A furnace floor temperature sensor 12 is connected to the input side of a controller 21 and a valve 16 for a heath gun auxiliary fuel or the like is connected to the output side thereof. The controller 21 is provided with a means for calculating a changing rate of the temperature of the hearth at a rising operation which calculates a difference per unit time Δt between the temperature T of the hearth at the time (t) and the temperature T(t-Δt) at the time (t-Δt) of the like to determine a changing rate of the temperature of the hearth at the rising time or the like. A control is performed using a changing rate of the temperature of the hearth at the rising time per unit time obtained based on the temperature of the hearth obtained by a feedback as input variable and a flow rate of an auxiliary fuel of a hearth burner 6 and a flow rate of an auxiliary fuel of a hearth gun 10 as output variables to raise the temperature of the hearth at a set rising rate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sludge incinerator start-up operation control method and apparatus for raising the temperature of a sludge incinerator from a start-up operation to a steady operation, and a medium for a fuzzy inference combustion control program.

[0002]

2. Description of the Related Art In general, in a sewage treatment plant, suspended solids originally contained in inflowing sewage and surplus sludge solids are generated as sludge by biological treatment which is a general method of sewage treatment. A sludge incinerator is used to incinerate such sludge. In the sludge incinerator, the hearth temperature is in a steady state at a high temperature of around 800 ° C., and the sludge is incinerated.

[0003] In order to make the hearth temperature in a sludge incinerator a steady state of a high temperature, the sludge incinerator is started from a low temperature,
The temperature is raised. At the time of start-up operation, control for accurately performing a temperature raising process is required. Sludge incinerators are known as shown in FIG. In the figure, reference numeral 1 denotes a sludge incinerator, and the sludge incinerator 1 has a furnace body 2.

[0004] The interior of the furnace body 2 is divided into a furnace bottom 4 and a hearth 5 via an air distribution plate 3. A furnace bottom burner 6 is attached to a lower portion of the air distribution plate 3 of the wall 2A on one side of the furnace body 2. The furnace bottom burner 6 raises the temperature of the furnace bottom 4 to a high temperature state before incinerating the sludge. An air inlet 7 is provided in a lower portion of the air distribution plate 3 of the wall 2B on the other side of the furnace body 2.

[0005] In the hearth section 5, sand having a large heat capacity for instantaneously incinerating sludge containing moisture is made to flow. An outlet 8 for discharging combustion gas is formed at the upper end 2C of the furnace body 2. An exhaust pipe 8A is connected to the outlet 8, and an exhaust gas oxygen concentration sensor 8B is interposed in the exhaust pipe 8A.

A sludge supply device 9 and a hearth gun 10 located below the sludge supply device 9 are mounted on an upper portion of the air distribution plate 3 of the wall 2A on one side of the furnace body 2. . The sludge supply device 9 supplies sludge dehydrated by an appropriate amount of water (still containing water) into the furnace body 2. The hearth gun 10 is for supplying fuel to the furnace body 2, and raises the hearth temperature of the hearth 5.

A furnace bottom temperature sensor 11 is mounted on the lower part of the air distribution plate 3 on the other side wall 2 B of the furnace body 2.
A hearth temperature sensor 12 is mounted on an upper portion of the air distribution plate 3 of the other wall portion 2B. Furnace bottom temperature sensor 11
Is for detecting the temperature of the furnace bottom 4 of the sludge incinerator 1. The hearth temperature sensor 12 detects the temperature of the hearth 5 of the sludge incinerator 1.

The furnace bottom burner 6 is connected to the tip of a first fuel supply pipe 13, and a furnace bottom burner auxiliary fuel valve 14 is provided in the middle of the first fuel supply pipe 13. The hearth gun 10 is connected to a tip of a second fuel supply pipe 15, and a hearth gun auxiliary fuel valve 16 is interposed in the middle of the second fuel supply pipe 15. The hearth temperature sensor 11 and the hearth temperature sensor 12 are connected to the input side of the control device 17, and the hearth gun auxiliary fuel valve 16 and the hearth burner auxiliary fuel valve 14 are connected to the output side of the control device 17. I have.

Thus, air is taken into the furnace bottom 4 from the air inlet 7, the air in the furnace bottom 4 is heated by the furnace bottom burner 6, and the furnace bottom 4 is heated by the furnace bottom burner 6. The heated air is sent as hot air from the furnace bottom 4 to the hearth 5 via the air distribution plate 3. With this hot air, the hearth 5 is maintained in a uniform fluidized bed. The furnace floor 5 is heated in advance by hot air from the furnace bottom 4. When the hearth temperature of the hearth portion 5 becomes close to 600 ° C., the heating operation is also performed simultaneously by the hearth gun 10, and the screw feeder rotation speed of the sludge supply device 9 is gradually increased to the rated value of the sludge supply amount. When it is determined that the hearth temperature has been stabilized at a constant target value, the hearth burner 6 is stopped by an operator's judgment, and the hearth gun 10 operates to maintain the hearth temperature in a steady state.

During the steady operation of the sludge combustion furnace 1, sludge is supplied to the hearth 5 by the sludge supply device 9, and the sludge is instantaneously heated by high-temperature fluidized sand, incinerated, and incinerated with flowing air. The ash is separated from the fluidized sand and discharged from the discharge port 8. And, in order to stabilize the combustion of sludge in the sludge incinerator, the hearth temperature is kept constant. next,
The start-up operation control method of the sludge incinerator will be described with reference to FIG.

By heating the furnace bottom 4 with the furnace bottom burner 6, the furnace floor 5 is heated and the furnace floor temperature is raised. The rise in the hearth temperature is shown in the figure, and the set value of the hearth temperature can be manually increased in accordance with the rise in the hearth temperature. The temperature rise curve of the furnace bottom temperature is configured in a step shape as shown in the figure, and the set value of the furnace bottom temperature is from 500 ° C. to 60 ° C.
The temperature is graded from 0 ° C. → 700 ° C. → 850 ° C.

For example, in the section of the set value of the furnace bottom temperature of 500 ° C., the controller 17 measures the furnace bottom temperature detected by the furnace bottom temperature sensor 11 by the PID control. By adjusting the opening degree of the bottom burner auxiliary fuel valve 14 in accordance with the difference, the flow rate of the auxiliary fuel of the bottom burner 6 is controlled, and the bottom temperature is controlled so as to become the set value of 500 ° C. Is done.

When the hearth temperature of the hearth section 5 becomes close to 600 ° C., a predetermined set value is provided, and the hearth gun 10 simultaneously raises the temperature. If the hearth temperature fluctuates significantly and the hearth temperature is likely to be out of the target range, the flow rate of the auxiliary fuel supplied to the hearth gun 10 is controlled manually by the operator.

[0014]

However, since the hearth burner 6 and the hearth gun 10 only adjust the flow rate of the auxiliary fuel to the set value, the hearth temperature and the furnace temperature until the set value is reached are reached. The rate of rise of the bottom temperature depends on the success, and it is not possible to clearly grasp the timing of sludge introduction into the furnace body 2 of the sludge incinerator 1, and it is also necessary to shorten the start-up operation time or to slightly delay it. Adjustment of the rate of increase in the hearth temperature is often troublesome because the operator must manually intervene at any time to change the set value of the auxiliary fuel flow rate of the hearth burner 6 and the hearth gun 10. Was.

Further, the furnace bottom burner 6 has a
Since the hearth gun 10 adjusts the flow rate of the auxiliary fuel with respect to the hearth temperature, when the temperature in winter is low, the hearth temperature in the hearth 5 is hard to rise, and only the hearth temperature rises. May be. If the temperature difference between the hearth temperature and the hearth temperature exceeds 300 ° C., the damage in the furnace body 2 proceeds due to the difference in thermal expansion, and the sludge incinerator 1
There is a problem that the life of the device is shortened.

In the temperature raising operation during the start-up operation of the furnace body 2, it is necessary for the operator to constantly monitor the furnace bottom temperature, the hearth temperature, the temperature difference between the furnace bottom temperature and the hearth temperature, and the rate of rise of the hearth temperature. If the hearth temperature does not follow the target ascending speed, the user manually intervenes in changing the hearth temperature or the set value of the hearth temperature and operating the flow rate of the auxiliary fuel of the hearth burner 6 and the hearth gun 10. There was a case.

When the furnace bottom temperature and the hearth temperature are brought closer to the set values, PID control can be performed. However, the deviation increased, and the hearth gun auxiliary fuel valve 1
6. The opening of the bottom burner auxiliary fuel valve 14 is 100%
Accordingly, there is a problem that the bottom fuel and the hearth temperature do not rise in accordance with the supply amount of the auxiliary fuel of the hearth burner 6 and the hearth gun 10, and the auxiliary fuel is wasted.

Further, when shifting from the start-up operation to the steady operation, if the timing of the operation for stopping the furnace bottom burner 6 and the operation for charging sludge into the furnace is late, the hearth temperature is set to the target value. As a result, the auxiliary fuel is wasted, and the life of the furnace body 2 due to damage in the furnace body 2 is shortened. On the other hand, if the timing of the operation is determined too early, the temperature of the hearth reaches a steady state (target value) later, which causes a delay in the incineration operation.

In particular, when performing intermittent operation without continuous operation for 24 hours, the operation of raising the temperature until the steady state is reached and the operation of monitoring the temperature in the furnace must be repeated for each operation. The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to surely adjust a rate of increase in a hearth temperature, prevent an excessive increase in only a furnace bottom temperature, and perform a start-up operation. It is an object of the present invention to provide a sludge incinerator start-up operation control method and apparatus thereof, and a medium for a fuzzy inference combustion control program, which can be smoothly shifted from a time to a proper operation at an appropriate timing.

[0020]

According to the first aspect of the present invention,
By heating the hearth with a hearth burner, the hearth located above the hearth is heated to raise the hearth temperature,
When the hearth temperature reaches a predetermined temperature, the hearth temperature obtained by feedback in the sludge incinerator start-up operation control method in which the hearth is heated by a hearth burner and a hearth gun to raise the hearth temperature. By controlling the rate of change of the hearth temperature at start-up per unit time obtained from the hearth temperature as an input variable, and controlling the flow rate of the hearth burner auxiliary fuel and the flow rate of the hearth gun auxiliary fuel as output variables, the hearth The temperature is increased at a set rate of increase.

According to a second aspect of the present invention, in the method for controlling the start-up operation of a sludge incinerator according to the first aspect, the hearth temperature is set to a plurality of rising rates. A third aspect of the present invention is the sludge incinerator startup control method according to the first or second aspect, wherein the hearth temperature is set to a rising rate that changes from a gentle slope to a steep slope. And

According to a fourth aspect of the present invention, in the method for controlling the start-up operation of a sludge incinerator according to any one of the first to third aspects, a temperature difference between the furnace bottom temperature and the hearth temperature is used as a control input variable. It is characterized by being added within 300 ° C.

According to a fifth aspect of the present invention, there is provided a method for controlling the start-up operation of a sludge incinerator according to any one of the first to fourth aspects, wherein the control input variable is a constant with respect to a unit time obtained by the hearth temperature. It is characterized in that the hearth temperature change rate is constantly added. The invention according to claim 6 is the invention according to claim 1.
The sludge incinerator start-up operation control method according to any one of claims 5 to 9, wherein the control is performed by fuzzy inference.

According to a seventh aspect of the present invention, the furnace bottom is heated by the furnace bottom burner, thereby heating the furnace floor disposed above the furnace bottom to increase the furnace floor temperature. When the floor temperature reaches a predetermined temperature, in the start-up operation control device of the sludge incinerator, which raises the hearth temperature by heating the hearth with a hearth burner and a hearth gun, the temperature of the hearth of the sludge incinerator is controlled. A hearth temperature sensor for detecting the temperature, a control device having the hearth temperature sensor connected to the input side, a valve for the hearth burner auxiliary fuel and a valve for the hearth gun auxiliary fuel connected to the output side of the control device. The control device includes: a startup hearth temperature change rate calculating unit that calculates a startup hearth temperature change rate per unit time based on a hearth temperature obtained by feedback; and a startup hearth temperature change rate. As an input variable, the opening of the bottom burner auxiliary fuel valve was determined. And a fuzzy inference unit for inferring and outputting the flow rate of the hearth burner auxiliary fuel and the flow rate of the hearth gun auxiliary fuel that determines the opening of the hearth gun auxiliary fuel valve. When the rate of change is small, the flow rate of the hearth burner auxiliary fuel is large, and as the hearth temperature change rate at startup increases, the flow rate of the hearth burner auxiliary fuel decreases. ,
The target value of the rate of change of the hearth temperature at startup is used as a reference label, and the membership function group of the rate of change of the hearth temperature at startup is formed by dividing the vicinity of the target value and dividing it into a plurality of sections. It is characterized by doing.

According to the present invention, the rate of change of the hearth temperature at the time of start-up is inputted, and if the rate of change of the hearth temperature at the time of start-up is small, the flow rate of the bottom burner auxiliary fuel is large, and A first rule group consisting of a plurality of rules in which the flow rate of the hearth burner auxiliary fuel decreases as the rate of change increases, and a target value of the rate of change of the hearth temperature at startup as a reference label and The hearth that determines the opening of the bottom burner auxiliary fuel valve by fuzzy inference in light of the membership function group of the hearth temperature change rate at start-up formed by dividing the neighborhood and dividing it into multiple sections The computer in the fuzzy inference unit records a fuzzy inference combustion control program that outputs the flow rate of the burner auxiliary fuel and the flow rate of the hearth gun auxiliary fuel that determines the opening of the hearth gun auxiliary fuel valve. It is a medium.

According to a ninth aspect of the present invention, in the fuzzy inference unit according to the seventh aspect, the flow rate of the hearth burner auxiliary fuel is large when the rate of change of the hearth temperature at startup is small, and the rate of change of the hearth temperature during startup is small. A second rule group consisting of a plurality of rules relating to a decrease in the flow rate of the bottom burner auxiliary fuel as the flow rate increases, and a hearth gun auxiliary fuel inferring a startup hearth temperature change rate as an input variable. When the rate of change of the hearth temperature at startup is small, the flow rate of the hearth gun auxiliary fuel is large, and the flow rate of the hearth gun auxiliary fuel decreases as the rate of change of the hearth temperature increases at startup. A third rule group consisting of rules, wherein a plurality of target values in the membership function group of the rate of change in the hearth temperature during the raising are provided.

According to a tenth aspect of the present invention, the rate of change of the hearth temperature at the time of start-up is input. A first rule group consisting of a plurality of rules in which the flow rate of the bottom burner auxiliary fuel decreases as the rate of change increases, and the flow rate of the bottom burner auxiliary fuel increases when the rate of change in the hearth temperature at startup is small. The second rule group consisting of a plurality of rules related to the fact that the flow rate of the hearth burner auxiliary fuel decreases as the rate of change of the hearth temperature at startup increases, and the rate of change of the hearth temperature at startup as an input variable. On the other hand, the hearth gun auxiliary fuel is inferred and output, and when the rate of change in the hearth temperature at startup is small, the flow rate of the hearth gun auxiliary fuel is large, and as the rate of change of the hearth temperature at startup increases, the hearth gun auxiliary fuel is increased. Flow rate The third rule group consisting of a plurality of rules and a plurality of target values are formed, and the target value of the rate of change in the hearth temperature at startup is used as a reference label, and the vicinity of the target value is divided into a plurality of sections. In light of the membership function group of the hearth temperature change rate at startup which is formed by allocation,
The fuzzy inference is performed, and the flow rate of the hearth burner auxiliary fuel that determines the opening of the hearth burner auxiliary fuel valve and the flow rate of the hearth gun auxiliary fuel that determines the opening degree of the hearth gun auxiliary fuel valve are output. This is a medium in which a fuzzy inference combustion control program in which a computer in the inference unit functions is recorded.

According to an eleventh aspect of the present invention, the control device according to the seventh aspect has a temperature difference calculating means for calculating a temperature difference between the hearth temperature and the hearth temperature. The fuzzy inference unit uses a temperature difference as an input variable, and has a plurality of rules such that the flow rate of the bottom burner auxiliary fuel increases when the temperature difference is small, and the flow rate of the bottom burner auxiliary fuel decreases as the temperature difference increases. A fourth rule group and a temperature difference membership function group formed by dividing the vicinity of the reference label into a plurality of sections while using the target temperature difference between the hearth temperature and the hearth temperature as a reference label. It is characterized by having.

According to a twelfth aspect of the present invention, the rate of change of the hearth temperature at start-up and the temperature difference are input, and if the rate of change of the hearth temperature at start-up is small, the flow rate of the bottom burner auxiliary fuel is large, A first rule group consisting of a plurality of rules in which the flow rate of the bottom burner auxiliary fuel decreases as the rate of change of the hearth temperature increases, A second rule group consisting of a plurality of rules in which the flow rate is large and the flow rate of the hearth burner auxiliary fuel decreases as the rate of change of the hearth temperature at startup increases, and the hearth temperature at startup as an input variable The hearth gun auxiliary fuel is inferred for the change rate, and if the hearth temperature change rate at startup is small, the flow rate of the hearth gun auxiliary fuel is large, and the hearth temperature change rate at startup increases as the hearth temperature change rate increases. Low auxiliary fuel flow And a third rule group consisting of a plurality of rules having a relationship that the flow rate of the bottom burner auxiliary fuel increases when the temperature difference is small, and the flow rate of the bottom burner auxiliary fuel decreases as the temperature difference increases. A fourth rule group having rules and a plurality of target values are formed, and a target value of the rate of change of the hearth temperature at startup is used as a reference label, and the vicinity of the target value is divided and allocated to a plurality of sections. Is formed by using the membership function group of the hearth temperature change rate at startup and the target values of the hearth temperature and the hearth temperature as a reference label and dividing the vicinity of the reference label into a plurality of sections. Fuzzy inference in light of the membership function group of the temperature difference to determine the opening of the bottom burner auxiliary fuel valve. Moth So as to output the flow rate of auxiliary fuel, a medium in which a fuzzy inference combustion control program a computer to function in the fuzzy inference unit.

According to a thirteenth aspect of the present invention, the control device according to the seventh or eleventh aspect calculates a steady state hearth temperature change rate per unit time obtained based on the hearth temperature. The fuzzy inference unit according to any one of claims 7 to 11, wherein the steady-state hearth temperature change rate is used as an input variable, the target value of the steady-state hearth temperature is used as a reference label, and the target value is set. Is formed by dividing the neighborhood of, and assigning a plurality of labels to a narrow section, the membership function of the smallest label among the labels of the narrow section and the membership function of the next smaller label adjacent to the membership function of this label Is used as a reference label with the hearth temperature membership functions that do not substantially overlap with the target value of the steady-state hearth temperature change rate, and divides the vicinity of the target value into multiple sections. In the case of the membership function group of the steady-state hearth temperature change rate and the smallest label among the labels in the narrow section of the membership function group of the hearth temperature, the steady-state hearth as an input variable A fifth rule group consisting of a plurality of rules relating to a relationship in which the hearth gun auxiliary fuel is inferred and output with respect to the temperature change rate, wherein the second rule group and the third rule group are labels of narrow sections. , The label being one step smaller than the membership function of the smallest label among the labels.

According to a fourteenth aspect of the present invention, the rate of change of the hearth temperature at startup, the temperature difference, and the rate of change of the hearth temperature during steady state are input,
The flow rate of the hearth burner auxiliary fuel is large when the rate of change of the hearth temperature at startup is small, and the flow rate of the bottom fuel burner auxiliary fuel is decreased as the rate of change of the hearth temperature at the start-up increases. With the first rule group, when the rate of change of the hearth temperature at startup is small, the flow rate of the hearth burner auxiliary fuel is large, and as the rate of change of the hearth temperature at startup increases, the flow rate of the hearth burner auxiliary fuel decreases. A second rule group consisting of a plurality of rules of relations, the second rule group consisting of labels one step smaller than the membership function of the smallest label among labels in a narrow section, and a hearth at startup as an input variable The hearth gun auxiliary fuel is inferred with respect to the temperature change rate.If the hearth temperature change rate at startup is small, the flow rate of the hearth gun auxiliary fuel is large, and the furnace hearth temperature change rate at startup increases as the hearth temperature change rate increases. floor A third rule group consisting of a plurality of rules for reducing the flow rate of auxiliary fuel, the rule being formed by a label one step smaller adjacent to the membership function of the smallest label among the labels in the narrow section; A fourth rule group having a plurality of rules in which the flow rate of the bottom burner auxiliary fuel is large when the difference is small and the flow rate of the bottom burner auxiliary fuel is small as the temperature difference is large; In the case of the smallest label among the labels in the narrow section of the function group, a fifth rule consisting of a plurality of rules of a relation that the hearth gun auxiliary fuel is inferred and output with respect to the steady-state hearth temperature change rate as an input variable. And a set of target values, the target value of the rate of change of the hearth temperature at startup is used as a reference label, and the area around the target value is divided and assigned to multiple sections. Is formed by using the membership function group of the hearth temperature change rate at startup and the target values of the hearth temperature and the hearth temperature as a reference label and dividing the vicinity of the reference label into a plurality of sections. The membership function group of the temperature difference and the target temperature difference of the steady-state hearth temperature are used as a reference label, and the vicinity of the target value is divided and a plurality of labels are assigned to a narrow section. The membership function of the smallest label among them and the membership function of the label one step smaller adjacent to the membership function of this label are a group of membership functions of the hearth temperature that do not substantially overlap with each other, and the rate of steady-state hearth temperature change. The target value is used as the reference label, and the vicinity of the target value is divided and divided into multiple sections. Then, the flow rate of the hearth burner auxiliary fuel that determines the opening of the hearth burner auxiliary fuel valve and the flow rate of the hearth gun auxiliary fuel that determines the opening of the hearth gun auxiliary fuel valve are determined by fuzzy inference. A medium in which a fuzzy inference combustion control program in which a computer in a fuzzy inference unit functions is recorded.

(Function) In the first aspect of the present invention,
By heating the hearth with a hearth burner, the hearth located above the hearth is heated to raise the hearth temperature,
When the hearth temperature reaches a predetermined temperature, the hearth temperature obtained by feedback in the sludge incinerator start-up operation control method in which the hearth is heated by a hearth burner and a hearth gun to raise the hearth temperature. By controlling the rate of change of the hearth temperature at start-up per unit time obtained from the hearth temperature as an input variable, and controlling the flow rate of the hearth burner auxiliary fuel and the flow rate of the hearth gun auxiliary fuel as output variables, the hearth Increase the temperature at the set rate.

In the second aspect of the present invention, the first aspect is provided.
In the start-up operation control method for the sludge incinerator described above, the hearth temperature is set to a plurality of rising rates. According to a third aspect of the present invention, in the method for controlling the start-up operation of a sludge incinerator according to the first or second aspect, the hearth temperature is set to a rising rate that changes from a gentle slope to a steep slope.

According to the fourth aspect of the present invention, the first aspect is provided.
In the start-up operation control method for a sludge incinerator according to any one of claims 3 to 4, a temperature difference between the furnace bottom temperature and the hearth temperature within 300 ° C is added to the control input variable. According to a fifth aspect of the present invention, in the method for controlling the start-up operation of a sludge incinerator according to any one of the first to fourth aspects,
As a control input variable, a steady-state hearth temperature change rate per unit time obtained from the hearth temperature is added.

In the invention according to claim 6, claim 1 is
In the start-up operation control method for a sludge incinerator according to any one of claims 5 to 5, the control is performed by fuzzy inference. In the invention according to claim 7, the hearth temperature is measured by the hearth temperature sensor. The hearth temperature is input to the fuzzy inference unit of the control device as an input variable, and at the same time, is sent to the hearth temperature change rate calculating means at startup.

[0036] In the start-up time of hearth temperature change rate calculating means, for example, the difference between the unit time Delta] t of the furnace bed temperature at time t T _t and time (t-Δt) at the hearth temperature _{T (t-} Δ _{t) ( Tt−} T _{(t− Δt)} ) is calculated as the rate of change of the hearth temperature at startup, and the rate of change of the hearth temperature at startup is input to the fuzzy inference unit. In the fuzzy inference unit, fuzzy inference is performed as follows.

First, input variables (hearth temperature, hearth temperature change rate at startup) are input to the fuzzy inference unit, and the selected rules are applied. The flow rate of the floor gun auxiliary fuel is output as a correction amount or an absolute value. The valve for the hearth burner auxiliary fuel has a rotation angle opening corresponding to the flow rate of the hearth burner auxiliary fuel. The auxiliary fuel is sent to the hearth burner in the state of the opening degree. The furnace bottom is heated by the furnace bottom burner. The heating of the furnace bottom heats the hearth above the furnace bottom, increasing the hearth temperature.

The hearth gun auxiliary fuel valve has a rotation angle opening corresponding to the flow rate of the hearth gun auxiliary fuel. The auxiliary fuel is sent to the hearth gun in the state of the opening degree. When the hearth temperature reaches a predetermined temperature, the hearth is heated by the hearth burner and the hearth gun. The flow rate of the bottom burner auxiliary fuel and the flow rate of the hearth gun auxiliary fuel are controlled. The hearth temperature indicating the combustion state of the controlled system resulting from the combustion of the auxiliary fuel and the rate of change of the hearth temperature at startup change, and the hearth temperature is fed back to the fuzzy inference unit.

The fact that the hearth temperature rises at the startup hearth temperature change rate of, for example, a target value of 25 ° C./h will be described. It consists of hearth temperature and rate of change of hearth temperature at start-up as input variables, fuzzy inference part, hearth burner auxiliary fuel flow rate as output variables, hearth temperature indicating the combustion state of controlled system, hearth temperature The temperature system forms a closed loop and converges to a balanced state. The rate of change in the hearth temperature at startup converges to the reference label (target value 25 ° C./h) of the membership function group.

In the fuzzy inference unit, the first
The flow rate of the bottom hearth burner auxiliary fuel changes according to the change in the hearth temperature change rate at startup according to the rule group.The hearth temperature change rate at startup is determined by the membership function of the reference label The membership function is applied and converges to the reference label (25 ° C./h). The fuzzy inference unit uses the target value of the hearth temperature change rate at startup as a reference label and divides the vicinity of the target value into multiple sections to form a membership of the hearth temperature change rate at startup. It has a group of functions.

Accordingly, for example, when the rate of change of the hearth temperature at startup as an input variable to be fed back is just improved (target value: 25 ° C./h), the label is ZR, and the first rule group is determined by the fuzzy inference unit. Applied, the bottom burner auxiliary fuel flow label is ZR and the temperature system is converging to a balanced state. When the rate of change of the hearth temperature at start-up, which indicates the result of the combustion state, changes from the state where the target value (25 ° C./h) has been reached, fuzzy inference is made based on these labels, and fuzzy inference is made according to the change in the combustion state. The flow rate of the furnace bottom burner auxiliary fuel is output from the section. In other words, in a state where the flow rate of the hearth burner auxiliary fuel does not change and the rate of change of the hearth temperature at the time of start-up is kept in a state that is just right, when the state of the rate of change of the hearth temperature deviates, the hearth The flow rate of the burner auxiliary fuel is controlled so as to change (increase or decrease) with respect to the previous flow rate of the hearth burner auxiliary fuel.

Even if the rate of change of the hearth temperature at start-up, which is an input variable, changes and deviates from the target value, which is a convergence value, the convergence value at which the rate of change of the hearth temperature at start-up is maintained at a good state is maintained. Then, the rate of change in the hearth temperature at the start-up converges to the original convergence value. In this state, the rate of change of the hearth temperature at startup and the flow rate of the bottom fuel burner auxiliary fuel are in a balanced state,
The fact that the rate of change in the hearth temperature during startup is just right is consequently judged to be appropriate.

In this manner, the rate of change of the hearth temperature at startup, which is an input variable, is controlled and converged to the target value of 25 ° C./h. In the invention described in claim 8, the fuzzy inference unit is executed by a medium in which a fuzzy inference combustion control program is recorded.

That is, the rate of change of the hearth temperature at the time of start-up is input, and when the rate of change of the hearth temperature at the time of start-up is small, the flow rate of the bottom burner auxiliary fuel is large, and as the rate of change of the hearth temperature at the time of start-up increases. A first rule group including a plurality of rules related to a decrease in the flow rate of the hearth burner auxiliary fuel, and a target value of the rate of change in the hearth temperature at the time of start-up being used as a reference label and dividing the vicinity of the target value into a plurality of groups. The flow rate of the bottom-burner auxiliary fuel, The flow rate of the hearth gun auxiliary fuel that determines the opening of the hearth gun auxiliary fuel valve is output.

In the ninth aspect of the present invention, there are a plurality of target values of the rate of change of the hearth temperature at the time of start-up, but the case where there are two target values will be described as an example. The control according to the ninth aspect of the present invention is the same as the control according to the seventh aspect of the present invention, and different points will be described. The hearth temperature changes from the rate of change of the hearth temperature at the start of the first target value (for example, 25 ° C./h) to the rate of change of the hearth temperature at the start of the second target value (eg, 100 ° C./h). And rise.

The second target value at which the rate of change of the hearth temperature at the time of startup converges is a label (for example, PL1) apart from the reference label in the membership function group of the rate of change of the hearth temperature at startup. In the fuzzy inference unit, a second rule group and a third rule group are applied. In the second rule group, the flow rate of the hearth burner auxiliary fuel changes in accordance with the change in the hearth temperature change rate at startup, and the hearth temperature change rate at startup depends on the membership function of the label PL1 and its membership function. A nearby membership function is applied and converges to label PL1.

In the third rule group, the flow rate of the hearth gun auxiliary fuel changes in response to the change in the rate of change of the hearth temperature at startup. The function and the membership functions near it are applied and converge to the label PL1. Second rule group, third
By applying the rule group, the rate of increase in the hearth temperature changes from a gentle slope (first target value of 25 ° C./h) to a steep slope (second target value of 100 ° C./h).

That is, even if the rate of change of the hearth temperature at startup as an input variable changes and deviates from the convergence value (label PL1) as the second target value, the rate of change of the hearth temperature at startup is just good. The state shifts to a convergence value that the state is maintained, and the rate of change in the hearth temperature at startup converges to the original convergence value. In this state, the rate of change of the hearth temperature at startup, the flow rate of the bottom burner auxiliary fuel, and the flow rate of the hearth gun auxiliary fuel are balanced, and the rate of change of the hearth temperature at startup is the second target value. Is determined to be appropriate as a result.

In this manner, the hearth temperature is calculated from the rate of change of the hearth temperature at the start-up of the first target value of 25 ° C./h to the rate of change of the hearth temperature at the start of the second target value of 100 ° C./h. The rate of change of the hearth temperature during startup, which is an input variable, is controlled and converged to a first target value of 25 ° C./h, and then converged to a second target value of 100 ° C./h. You. According to the tenth aspect of the present invention, the fuzzy inference unit is executed by a medium in which a fuzzy inference combustion control program is recorded.

That is, the rate of change of the hearth temperature at the time of start-up is input. A first rule group including a plurality of rules related to a decrease in the flow rate of the hearth burner auxiliary fuel, and a flow rate of the hearth burner auxiliary fuel that is large when the rate of change in the hearth temperature at startup is small; A second rule group consisting of a plurality of rules in which the flow rate of the hearth burner auxiliary fuel decreases as the temperature change rate increases, and the hearth gun assist rate with respect to the startup hearth temperature change rate as an input variable. When the fuel is inferred and the hearth temperature change rate at startup is small, the flow rate of the hearth gun auxiliary fuel is large, and as the hearth temperature change rate at startup increases, the flow rate of the hearth gun auxiliary fuel decreases. Multiple routs of And a plurality of target values, and the target value of the rate of change of the hearth temperature at the time of startup is used as a reference label, and the vicinity of the target value is divided and divided into a plurality of sections. The flow rate of the hearth burner auxiliary fuel, which determines the opening of the hearth burner auxiliary fuel valve, and the hearth gun auxiliary fuel valve, which are fuzzy inferred in view of the membership function group of the hearth temperature change rate at startup. The flow rate of the hearth gun auxiliary fuel that determines the opening degree of the hearth gun is output.

According to the eleventh aspect of the present invention, the temperature difference between the hearth temperature and the hearth temperature is such that the hearth temperature is three times lower than the hearth temperature.
It is controlled within the range of 00 ° C. higher. This will be described below. Hearth temperature, temperature difference and rate of change of hearth temperature at startup, fuzzy inference part as input variables, hearth burner auxiliary fuel flow rate as output variables, hearth temperature indicating combustion state of controlled system, hearth A temperature system consisting of temperatures forms a closed loop and converges to a balanced state. The target temperature difference at which the temperature difference converges is the reference label ZR (within 300 ° C. of the temperature difference membership function group). In the fuzzy inference unit, in the fourth rule group, the flow rate of the bottom burner auxiliary fuel changes in response to the change in the temperature difference, and the temperature difference is determined by the membership function of the reference label and the membership function in the vicinity thereof. Applied and converge to the reference label.

When the temperature difference indicating the result of the combustion state changes from the state where the temperature has reached the target value (reference label ZR), fuzzy inference is made based on these labels. The flow rate of the burner auxiliary fuel is output. Even if the temperature difference, which is an input variable, changes and deviates from the convergence value, which is the target temperature difference, the temperature shifts to a convergence value in which a good state is maintained, and the temperature difference converges to the original convergence value. In this state, the temperature difference and the flow rate of the furnace bottom burner auxiliary fuel are in a well-balanced state, and it is determined that the temperature difference being just right is appropriate as a result.

In this way, the temperature difference, which is an input variable, is controlled and converged on the target temperature difference. In a twelfth aspect of the present invention, the fuzzy inference unit is executed by a medium storing a fuzzy inference combustion control program. That is, the rate of change in the hearth temperature at startup and the temperature difference are input, and when the rate of change in the hearth temperature at startup is small, the flow rate of the bottom burner auxiliary fuel is large, and as the rate of change in the hearth temperature at startup increases. A first rule group consisting of a plurality of rules related to a decrease in the flow rate of the hearth burner auxiliary fuel, and a flow rate of the hearth burner auxiliary fuel being large when the rate of change in the hearth temperature at startup is small, and A second rule group consisting of a plurality of rules in which the flow rate of the hearth burner auxiliary fuel decreases as the temperature change rate increases, and a heart rate gun assist rate with respect to the startup hearth temperature change rate as an input variable. When the fuel is inferred and the hearth temperature change rate at startup is small, the flow rate of the hearth gun auxiliary fuel is large, and the flow rate of the hearth gun auxiliary fuel decreases as the hearth temperature change rate at startup increases. Multiple rules And a fourth rule having a relationship that the flow rate of the bottom burner auxiliary fuel increases when the temperature difference is small and the flow rate of the bottom burner auxiliary fuel decreases as the temperature difference increases. A group and a plurality of target values are formed, and the target value of the rate of change of the hearth temperature at the time of start-up is used as a reference label, and the vicinity of the target value is divided and divided into a plurality of sections to form a start-up hearth. A membership function group for the temperature change rate and a membership function group for the temperature difference formed by dividing the vicinity of the reference label into multiple sections by using the hearth temperature and the target value of the hearth temperature as the reference label In view of the above, the fuzzy inference is performed, and the flow rate of the hearth burner auxiliary fuel that determines the opening of the hearth burner auxiliary fuel valve and the flow rate of the hearth gun auxiliary fuel that determines the opening degree of the hearth gun auxiliary fuel valve are output. Sa That.

According to the thirteenth aspect of the present invention, control for shifting from the start-up operation to the steady operation will be described. First, input variables (hearth temperature, rate of change in hearth temperature at startup) are input to the fuzzy inference unit, the selected rules are applied, and the flow rate of the bottom burner auxiliary fuel, hearth gun auxiliary The fuel flow is output.

The bottom burner auxiliary fuel valve has a rotation angle opening corresponding to the flow rate of the bottom burner auxiliary fuel. The auxiliary fuel is sent to the hearth burner in the state of the opening degree. The furnace bottom is heated by the furnace bottom burner. The heating of the furnace bottom heats the hearth above the furnace bottom, increasing the hearth temperature. The hearth gun auxiliary fuel valve has an opening of a rotation angle corresponding to the flow rate of the hearth gun auxiliary fuel. The auxiliary fuel is sent to the hearth gun in the state of the opening degree. Hearth temperature is for example 60
At about 0 ° C. or higher, the hearth is heated by the hearth burner and the hearth gun.

The hearth temperature indicating the combustion state of the controlled system resulting from the combustion of the auxiliary fuel, the hearth temperature change rate at startup, and the hearth temperature change rate in the steady state change, and the hearth temperature is changed by the fuzzy inference unit. Will be fed back. Hereinafter, a specific description will be given. The fuzzy inference unit uses the target value of the hearth temperature in the steady state as a reference label, divides the vicinity of the target value, and allocates a plurality of labels to a narrow section. The membership function of the label NM and the one-step smaller label adjacent to the membership function of the label NM, for example, the membership function of the NL, are a group of membership functions of the hearth temperature that do not substantially overlap with each other, and the steady-state hearth temperature change rate. The target value of is used as a reference label and the vicinity of the target value is divided and divided into a plurality of sections to form a membership function group of steady-state hearth temperature change rate, and the smallest label among narrow section labels In the case of (NM), there are a plurality of rules of a relationship in which the hearth gun auxiliary fuel is inferred and output with respect to the steady-state hearth temperature change rate as an input variable. A fifth rule group, wherein the second rule group and the third rule group are one step smaller labels (NL) adjacent to the membership function of the smallest label (NM) among the labels in the narrow section. Holds.

Therefore, when the hearth temperature rises and the fifth rule group is applied, in the fifth rule group, if the hearth temperature label is in the NL range, the rate of change in the hearth temperature at startup ( Second
And the third rule group) are applied, and the rate of change in the hearth temperature at startup is converged to the second target value of 100 ° C./h.

The hearth temperature changes from a rising state to a steady state, but the steady state convergence value of the hearth temperature is set to a temperature range near the reference label (805 ° C.). The value is near the reference label (for example, 0 ° C./h). Therefore, at the same time that the hearth temperature label is in the range of NM, the membership function of the hearth temperature is hardly applied to the membership function of the label NL. Has little effect on the output due to the membership function of the label NL), the membership function of the label NM is applied, and hearth gun auxiliary fuel is supplied.

When the hearth temperature label is in the range of NM,
The application of the hearth temperature change rate at startup (the second rule group and the third rule group) is almost cancelled, and at the same time, the steady-state hearth temperature change rate is applied. Value 0 ° C /
h. The hearth temperature is controlled from a rising state (steep inclination) to a steady state (horizontal angle). Then, in the fuzzy inference unit, the flow rate of the hearth gun auxiliary fuel changes according to the change of the steady-state hearth temperature change rate in the fifth rule group,
The constant hearth temperature change rate converges on the reference label (0 ° C./h) by applying the membership function of the reference label and the membership functions near the reference label.

As described above, when the hearth temperature label is NM or more, the hearth temperature is controlled from a steep slope to a horizontal angle. The hearth temperature is a reference label for the membership function (eg, 80
5 ° C) and the rate of change in the hearth temperature at startup is 0 ° C / h
Converges to As described above, the hearth temperature is controlled from a rising state (steep inclination) to a steady state (horizontal angle).

In the fourteenth aspect of the present invention, the fuzzy inference unit is executed by a medium in which a fuzzy inference combustion control program is recorded. That is, the rate of change of the hearth temperature at start-up, the temperature difference, and the rate of change of the hearth temperature at steady state are input. A first rule group including a plurality of rules in which the flow rate of the hearth burner auxiliary fuel decreases as the rate of change in the floor temperature increases, and the flow rate of the furnace bottom burner auxiliary fuel when the rate of change in the hearth temperature at startup increases. Is large, and the flow rate of the bottom fuel burner auxiliary fuel decreases as the rate of change in the hearth temperature at startup increases, and it is adjacent to the membership function of the smallest label among the labels in a narrow section. The hearth gun auxiliary fuel is inferred and output with respect to the second rule group that is satisfied by the label one step smaller and the hearth temperature change rate at startup as an input variable. Small and hearth It consists of a number of rules in which the flow rate of the hearth gun auxiliary fuel decreases as the flow rate of the auxiliary fuel increases and the rate of change in the hearth temperature during startup increases. The third rule group, which is formed by a label one step smaller adjacent to the ship function, shows that the flow rate of the bottom burner auxiliary fuel increases when the temperature difference is small, and the flow rate of the bottom burner auxiliary fuel increases as the temperature difference increases. In the case of the fourth rule group having a plurality of rules of decreasing relation and the smallest label among the labels in the narrow section of the membership function group of the hearth temperature, the steady-state hearth temperature change rate as an input variable A fifth rule group composed of a plurality of rules relating to the inference output of the hearth gun auxiliary fuel to the target, and a plurality of target values, the target of the hearth temperature change rate at startup Is used as a reference label, and a group of membership functions for the rate of change of the hearth temperature at startup, which is formed by dividing the vicinity of the target value into multiple sections, and the target values of the hearth temperature and the hearth temperature A group of temperature difference membership functions formed by dividing the vicinity of the reference label and assigning it to multiple sections as a label, and the target temperature difference of the steady state hearth temperature as the reference label and the vicinity of the target value Is formed by dividing a plurality of labels into narrow sections, and the membership function of the smallest label among the labels of the narrow section and the membership function of the next smaller label adjacent to the membership function of this label are approximately A group of non-overlapping hearth temperature membership functions and a steady-state hearth temperature change rate target value are used as a reference label. The flow rate of the bottom burner auxiliary fuel, the flow rate of the hearth burner auxiliary fuel, which is fuzzy inferred in light of the membership function group of the steady state hearth temperature change rate formed by allocating the The flow rate of the hearth gun auxiliary fuel that determines the opening of the gun auxiliary fuel valve is output.

[0062]

Embodiments of the present invention will be described below with reference to the drawings. According to FIGS. 1 to 13, a method for controlling a start-up operation of a sludge incinerator according to an embodiment of the invention according to claims 1 to 6, and claims 7, 9, 11, and 13. A start-up operation control device for a sludge incinerator according to an embodiment of the present invention;
The media according to claim 10, 12, and 14 will be described. The structure of the sludge incinerator according to the present embodiment is the same as that of a conventional sludge incinerator, and the same components will be denoted by the same reference numerals, and the description thereof will be omitted, and only different portions will be described.

In FIG. 1, reference numeral 21 denotes a control device, and a furnace bottom temperature sensor 11 and a hearth temperature sensor 12 are connected to the input side of the control device 21. Further, a valve 14 for hearth burner auxiliary fuel and a valve 16 for hearth gun auxiliary fuel are connected to the output side of the control device 21. As shown in FIG. 2, the control device 21 includes a startup hearth temperature change rate calculation unit 22, a steady-state hearth temperature change rate calculation unit 23, a temperature difference calculation unit 24, a fuzzy inference unit 25, It comprises a hearth burner valve operation amount calculation means 26 and a hearth gun valve operation amount calculation means 27.

The startup hearth temperature change rate calculating means 22
During the start-up operation, the hearth temperature T _t at time _t and the time (t
_(Difference of _{t-delta t)} unit time _{Δt (T t -T (t- Δ} t) hearth temperature T) calculated in -.DELTA.t), is intended to obtain a startup time hearth temperature change rate . Steady hearth temperature change rate calculating section 23, the difference between the steady-state operation, the hearth at time t a temperature T _t and time (t-Delta] t) in the hearth temperature T _{(t-delta t)} time unit Delta] t ( _Tt- T _{(t- [} Delta] _t) ) to obtain a steady-state hearth temperature change rate.

The temperature difference calculation means 24 obtains a temperature difference by subtracting the hearth temperature from the hearth temperature. The fuzzy inference unit 25 includes a first rule group 28 shown in Tables 1 and 2 below.
A, a knowledge 28 having a second rule group 28B, a third rule group 28C, a fourth rule group 28D, a fifth rule group 28E, a hearth temperature membership function group 29, and a hearth temperature Membership function group 30, temperature difference membership function group 31, startup hearth temperature change rate membership function group 32, steady-state hearth temperature change rate membership function group 33, hearth It comprises a membership function group 34 for the correction amount of the flow rate of the burner auxiliary fuel, a membership function group 35 for a correction amount of the flow rate of the hearth gun auxiliary fuel, and a fuzzy inference engine 36. The fuzzy inference unit 25 includes, for example, a fuzzy chip, a floppy,
OM is recorded as a fuzzy inference combustion control program on the medium. The fuzzy inference unit 25 is executed by the medium in which the fuzzy inference combustion control program is recorded.

[Table 1]

[Table 2] The knowledge 28 is represented by “IF input variable THEN output variable (inference output)”, and input variables are hearth temperature, hearth temperature, hearth temperature change rate at startup, hearth temperature change rate at steady state, and temperature. In the difference, the output variables are the correction amount of the bottom burner auxiliary fuel flow rate and the correction amount of the hearth gun auxiliary fuel flow rate.

The first rule group 28A includes rules 9-10
When the rate of change of the hearth temperature at startup, which is an input variable, is small, the correction amount of the flow rate of the bottom burner auxiliary fuel, which is an output variable, is large, and the rate of change of the hearth temperature at startup, which is an input variable, is large. It is composed of a plurality of rules that reduce the amount of correction of the flow rate of the bottom burner auxiliary fuel, which is the output variable, as the output variable becomes. For example, in the case where the rate of change of the hearth temperature at startup is ZR, if the rate of change of the hearth temperature during startup increases from ZR to PS, the correction amount of the flow rate of the bottom burner auxiliary fuel becomes ZR →
There is a relationship that becomes smaller with NS.

The second rule group 28B includes rules 12-1
6, when the rate of change of the hearth temperature at start-up, which is an input variable, is small, the amount of correction of the flow rate of the bottom burner auxiliary fuel, which is an output variable, is large, and the rate of change of the It consists of a plurality of rules that the correction amount of the flow rate of the bottom burner auxiliary fuel, which is the output variable, decreases as the value increases. For example, when the hearth temperature is NL, the correction rate PL of the flow rate of the hearth burner auxiliary fuel corresponds to the startup hearth temperature change rate ZR, and the startup hearth temperature change rate ZR → As the order of PS → PM → PL1 → PL2 becomes larger, the correction amount of the flow rate of the furnace bottom burner auxiliary fuel becomes PL → PM
→ PS → ZR → NS.

The third rule group 28C includes rules 47 to 5
The hearth gun auxiliary fuel is inferred and output with respect to the hearth temperature change rate at start-up as an input variable. If the input hearth temperature change rate at startup is small, the furnace As the correction amount of the flow rate of the bottom burner auxiliary fuel is large and the rate of change in the hearth temperature at startup which is an input variable is large, the correction amount of the flow rate of the bottom burner auxiliary fuel which is an output variable is small. Consists of rules. For example, when the hearth temperature is NL, the correction rate PL of the flow rate of the hearth burner auxiliary fuel corresponds to the NM of the hearth temperature change rate at startup, and the hearth temperature change rate at startup is NM → NS → ZR →
As PS → PM → PL1 → PL2 increases, the correction amount of the flow rate of the furnace bottom burner auxiliary fuel becomes PL → PL → PL →
PM → PS → ZR → NM.

The fourth rule group 28D comprises rules 1 to 8. When the temperature difference is small, the amount of correction of the flow rate of the bottom burner auxiliary fuel is large, and as the temperature difference increases, the flow rate of the bottom burner auxiliary fuel is increased. It is composed of a plurality of rules with a relation that the correction amount becomes small. For example, if the hearth temperature is NLL (shown in the hearth temperature membership function in FIG. 4),
The correction amount PS of the flow rate of the bottom burner auxiliary fuel corresponds to the NS of the temperature difference, and as the temperature difference increases from NS → ZR → PS → PM, the correction amount of the flow rate of the bottom burner auxiliary fuel becomes PS → There is a relationship that becomes smaller as ZR → NS → NM.

The fifth rule group 28E includes rules 54 to 6
0, the hearth gun auxiliary fuel infers the steady-state hearth temperature change rate as an input variable in the case of the smallest label (NM) among the labels in a narrow section in the hearth temperature membership function. It is output.
Rules 54 to 60 indicate that the correction amount of the hearth gun auxiliary fuel is large when the steady state hearth temperature change rate is small, and the correction amount of the hearth gun auxiliary fuel flow amount is increased as the steady state hearth temperature change rate increases. It consists of a plurality of rules of decreasing relation. For example, when the hearth temperature is NM, as the steady-state hearth temperature change rate increases as NL → NM → NS → ZR → PS → PM → PL, the correction amount of the flow rate of the hearth gun auxiliary fuel becomes PL → There is a relationship that becomes smaller in the order of PL → PL → PM → PS → ZR → NL.

Next, each membership function group 29,3
0, 31, 32, 33, 34 and 35 are shown in FIGS.
This will be described below. In the figure, the entire range of input variables and output variables is assigned with a plurality of labels, and membership functions are shown. The horizontal axis represents input / output values of input / output variables, and the vertical axis represents grades. I have. As a label,
A reference label (ZR), one or more positive labels that are evaluated as an upper state with respect to the reference label, and one or more negative labels that are evaluated as a lower state with respect to the reference label are attached. For example, at the hearth temperature, seven types of labels are assigned as follows.

NLL: (very low) fairly small NL; (very low) very small NM; (low) small NS: (slightly low) slightly small ZR: (just right) as it is PS: (slightly high) slightly large PM: (High) Large In addition, several types of input variables and output variables other than the hearth temperature are similarly determined according to each variable. In particular, in the startup hearth temperature change rate in FIG. 8, PL1 is determined as a label larger than PM and PL2 is determined as a label larger than PL1.

The hearth temperature membership function group 29 is shown in FIGS. In the figure, the reference label ZR = the target value (905 ° C.), and the labels (NM, NS, ZR, PS) are formed by allocating the vicinity of the target value of the hearth temperature (788 ° C. to 815 ° C.) to a plurality of sections. A membership function is formed corresponding to the label (NM, NS, ZR, PS). (788 ° C-815
° C), the section of the label (NM, NS, ZR, PS) is narrow, and the label (NL) other than (788 ° C to 815 ° C)
L, NL, PM) are wide.

The membership function of the smallest label NM among the labels in the narrow section and the membership function of the next smaller label NL adjacent to the membership function of this label NM do not substantially overlap. The phrase “substantially no overlap” refers to not only “when there is no agreement” but also “when there is almost no agreement”. FIG. 5 shows that the straight line L1 of the membership function of the label NL and the straight line L2 of the membership function of the label NM are grade 0.
A case where they meet near 00 and hardly match each other is shown. “No match at all” is the case where the straight line L1 is at the position indicated by the dotted line L3 in FIG.

The membership function group 30 for the furnace bottom temperature is
As shown in FIG. In the figure, the reference label ZR = the target value (650 ° C.), and the vicinity of the target value of the furnace bottom temperature (630 ° C.)
670 ° C) to a plurality of sections and label (NS,
ZR, PS) are respectively formed, and the labels (NS, Z) are formed.
(R, PS). Labels (NS, 630 ° C to 670 ° C)
The section of (ZR, PS) is narrow, and the section of the label (NM, PM, PL) other than (630 ° C. to 670 ° C.) is wide.

The membership function group 31 of the temperature difference is shown in FIG.
And the reference label ZR = target value (200 ° C.),
The case where the temperature difference increases is plus, and the case where the temperature difference decreases is minus. The section (175 ° C. to 250 ° C.) is allocated to a plurality of sections, and the label (ZR, PS) is the target range.

FIG. 8 shows a membership function group 32 of the hearth temperature change rate at the time of startup. In the figure, the reference label ZR is set to the first target value (25 ° C./h), and the case where the rate of change in the hearth temperature is increased is plus, and the case where it is decreased is minus. The section (5 ° C./h to 35 ° C./h) is allocated to a plurality of sections, and the label (NS, ZR) is the target range. PL1 = second target value (100 ° C./h)
The case where the hearth temperature change rate increases from PL1 with respect to PL1 is PL2, and the case where it decreases decreases is PM. The section (70 ° C./h to 110 ° C./h) is allocated to a plurality of sections, and the label (PM, PL1) is the target range.

The membership function group 33 of the steady-state hearth temperature change rate is shown in FIG. 9, where the reference label ZR = the target value (0 ° C./h), and the case where the hearth temperature change rate increases is added. A decrease is considered negative. Section (-4
(0 ° C./h to 40 ° C./h) is assigned to a plurality of sections, and the labels (NM, NS, ZR, PS, PM) are the target range.

FIG. 10 shows the membership function group 34 for the correction amount of the flow rate of the bottom burner auxiliary fuel. The reference label ZR = 2000 (dimensionless), and the label (NL, N
(M, NS, ZR, PS, PM, PL). A membership function group 35 for the correction amount of the hearth gun auxiliary fuel flow rate is shown in FIG. Assuming that the reference label ZR = 2000 (dimensionless), membership functions corresponding to the labels (NL, NM, NS, ZR, PS, PM, PL) are shown.

The fuzzy inference engine 36 calculates the hearth temperature,
By taking the hearth temperature, the hearth temperature and the temperature difference between the hearth temperature, the rate of change of the hearth temperature at start-up, and the rate of change of the hearth temperature during steady state as input variables, and illuminating the input variables with knowledge 28, The relevant rules are selected from the knowledge 28 and the membership function groups 29, 30, 31, 32, 33, 34,
The fuzzy inference is executed via 35 to output the corrected amount of the hearth burner auxiliary fuel flow rate and the corrected amount of the hearth gun auxiliary fuel flow rate.

Calculating means 26 for valve operation amount for hearth burner
Is based on the following equation determines the flow rate M _G of the furnace bottom burners auxiliary fuel by the input of the flow rate of the correction amount of the furnace bottom burners auxiliary fuel,
In which the flow rate M _G of the furnace bottom burners auxiliary fuel determine the opening of the furnace bottom burners auxiliary fuel valve 14. Here _{M G = K · (ΔM G} -2000) · G G + M GF, M G: hearth burners auxiliary fuel flow rate (m ³ / h) K: proportionality constant _{^{(m 3 / h) ΔM G}} : Fuzzy Inference Correction amount (dimensionless) of the flow rate of the auxiliary fuel for the hearth burner (dimensionless) G _G : control gain (dimensionless) M _GF : previous operation amount (m ³ / h) The opening degree of the hearth gun auxiliary fuel valve 16 is obtained in the same manner as the bottom burner valve operation amount calculation means 26.

Next, the operation of this embodiment will be described with reference to FIGS. FIG. 3 is a block diagram showing a signal flow. FIG. 12 is a diagram showing target temperature rise curves of the furnace bottom temperature and the hearth temperature. The furnace floor temperature and the furnace bottom temperature are controlled along the target temperature rise curve in FIG. 12 from the start-up operation to the steady operation, and are also controlled during the steady operation. At the time of steady operation, the hearth temperature is in a steady state near 805 ° C., and sludge can be incinerated. This will be described below.

The hearth temperature is measured by the hearth temperature sensor 12. The hearth temperature is determined by the fuzzy inference unit 2 of the controller 21.
5 is input as an input variable, and at the same time, sent to the startup hearth temperature change rate calculation means 22 and the steady-state hearth temperature change rate calculation means 23. The furnace bottom temperature sensor 11 measures the furnace bottom temperature. The furnace bottom temperature is input to the fuzzy inference unit 25 of the control device 21 as an input variable.

[0084] difference between the unit time Delta] t of the start-up time of hearth temperature change rate calculating means 22, the furnace bed temperature at time t T _t and time (t-Δt) at the hearth temperature _{T (t-} Δ _{t) ( Tt−} T _{(t− Δt)} ) is calculated as the rate of change in the hearth temperature at startup, and the rate of change in the hearth temperature is input to the fuzzy inference unit 25. The start-up hearth temperature change rate calculating means 22 is operated during the start-up operation.

In the steady state hearth temperature change rate calculating means 23,
The difference ( _Tt- T _{(t- [} Delta] _t) ) between the hearth temperature _Tt at time _t and the unit time [Delta] _t of the hearth temperature T _{(t- [} Delta] _t) at time _{(t- [} Delta] _t ) is determined at the time of startup. The floor temperature change rate is calculated as the floor temperature change rate, and the steady-state hearth temperature change rate is input to the fuzzy inference unit 25. The constant hearth temperature change rate calculating means 23 is operated at the stage of transition from the start-up operation to the steady operation and during the steady operation.

In the temperature difference calculating means 24, the temperature difference is obtained by subtracting the hearth temperature from the hearth temperature. The temperature difference is input to the fuzzy inference unit 25 as an input variable. In the fuzzy inference unit 25, fuzzy inference is performed as follows. (1) At startup operation First, input variables (hearth temperature, hearth temperature, hearth temperature change rate at startup, temperature difference) are input to the fuzzy inference unit 25,
The selected rule is applied, and the fuzzy inference unit 25 infers and outputs the corrected amount of the hearth burner auxiliary fuel flow rate and the corrected amount of the hearth gun auxiliary fuel flow rate. Fuzzy inference unit 25
, The corrected amount of the flow rate of the hearth burner auxiliary fuel and the corrected amount of the flow rate of the hearth gun auxiliary fuel are inferred and output by the well-known defuzzification using the knowledge 28 and the membership function groups 29 to 35.

The valve 14 for the bottom burner auxiliary fuel has a rotation angle opening corresponding to the correction amount of the flow rate of the bottom burner auxiliary fuel. The auxiliary fuel is sent to the furnace bottom burner 6 in the state of the opening degree. The furnace bottom 4 is heated by the furnace bottom burner 6. The heating of the furnace bottom 4 heats the hearth 5 above the furnace bottom 4 and raises the hearth temperature. The hearth gun auxiliary fuel valve 16 has an opening of a rotation angle corresponding to the correction amount of the flow rate of the hearth gun auxiliary fuel. The auxiliary fuel is sent to the hearth gun 10 in the state of the opening degree. When the hearth temperature reaches around 600 ° C,
The hearth section 5 is heated by the hearth burner 6 and the hearth gun 10.

The correction amount of the hearth burner auxiliary fuel and the correction amount of the hearth gun auxiliary fuel are controlled so as to obtain the rise curves of the hearth temperature and the hearth temperature in FIG. The hearth temperature, the hearth temperature, and the rate of change in the hearth temperature at startup, which indicate the combustion state of the controlled system resulting from the combustion of the auxiliary fuel, change, and the hearth temperature is fed back to the fuzzy inference unit 25.

(A), (B), (C) and (D) will be described below. (A): In a range where the hearth temperature is smaller than 650 ° C., the hearth temperature increases at the startup hearth temperature change rate of the first target value of 25 ° C./h. (B): The hearth temperature is 600 ° C. In a range larger than around 0 ° C., the hearth temperature changes from the first target value of 25 ° C./h at the start-up hearth temperature change rate to the second target value of 100 ° C./h at the start-up hearth temperature change rate. (C): The temperature difference between the hearth temperature and the hearth temperature is controlled within a range of 200 ° C. higher than the hearth temperature. (D): The hearth temperature is 600 ° C. In the range larger than near,
First, (A) In a range where the hearth temperature is lower than 650 ° C, the hearth temperature is changed to the first target value of 25 ° C / h at the time of start-up hearth temperature change rate. Explain that it rises.

Hearth temperature and rate of change of hearth temperature at start-up as input variables, fuzzy inference section 25, hearth burner auxiliary fuel flow rate correction variables as output variables, hearth indicating combustion state of controlled system The temperature system consisting of the temperature and the furnace bottom temperature forms a closed loop and converges to a balanced state.
The rate of change in the hearth temperature at startup converges to the reference label (first target value 25 ° C./h) of the membership function group 32 in FIG.

In the fuzzy inference unit 25, the first rule group 28A (rules 9 and 10) changes the amount of correction of the flow rate of the bottom burner auxiliary fuel in accordance with the change in the rate of change in the hearth temperature at startup. As for the rate of change of the hearth temperature at startup, the membership function of the reference label and the membership functions near the reference label are applied, and the rate converges on the reference label (25 ° C./h).

Therefore, for example, when the rate of change of the hearth temperature at the start-up as an input variable to be fed back is just improved (first target value 25 ° C./h), the fuzzy inference unit 25 sets the first rule group 28A to Rule 9 is applied, the label is ZR, the label of the correction amount of the bottom burner auxiliary fuel flow is ZR, and the temperature system has converged to a balanced state.

Here, the fuzzy inference unit 25 uses the target value of the rate of change of the hearth temperature at the time of startup as a reference label and divides the vicinity of the target value into a plurality of sections to form a startup furnace. Floor temperature change rate membership function group 32
When the rate of change of the hearth temperature at startup is small, the amount of correction of the flow rate of the bottom burner auxiliary fuel is large, and as the rate of change of the hearth temperature at startup increases, the correction amount of the flow rate of the bottom burner auxiliary fuel is small. It has a first rule group 28A (rules 9 to 10) composed of a plurality of rules having the following relationship.

Therefore, when the rate of change of the hearth temperature at startup increases from this state and changes from the label ZR to, for example, the label PS, the correction amount of the flow rate of the bottom burner auxiliary fuel changes from the label ZR to NS ( Rule 10). As a result, the correction amount of the flow rate of the bottom burner auxiliary fuel is reduced, the calorific value at the bottom 4 is reduced, the amount of heat transmitted from the bottom 4 to the bottom 5 is reduced, and the bottom The temperature change rate decreases, and the label PS returns to the original convergence value (label ZR).

As described above, when the rate of change of the hearth temperature at start-up, which indicates the result of the combustion state, has changed from the state where the first target value (25 ° C./h) has been reached, fuzzy inference is made based on these labels. The fuzzy inference unit 25 outputs a correction amount of the flow rate of the bottom burner auxiliary fuel according to the change of the combustion state. That is, in a state in which the correction amount of the flow rate of the hearth burner auxiliary fuel does not change and the state in which the rate of change in the hearth temperature at startup is just good is maintained (rule 9), the state of the rate of change in the hearth temperature is When the state is deviated, the correction amount of the flow rate of the bottom burner auxiliary fuel is controlled to be changed (increase or decrease) with respect to the previous correction amount of the flow rate of the hearth burner auxiliary fuel.

Even when the rate of change of the hearth temperature at startup, which is an input variable, changes and deviates from the first target value of 25 ° C./h, which is a convergence value, a state in which the rate of change of the hearth temperature at startup is just good is maintained. The convergence value is maintained, and the rate of change in the hearth temperature during startup converges to the original convergence value. In this state, the rate of change of the hearth temperature at startup and the correction amount of the flow rate of the bottom burner auxiliary fuel are in a well-balanced state, and it is consequently appropriate that the rate of change of the hearth temperature at startup is just good. It will be determined that there is.

In this manner, the rate of change of the hearth temperature at startup, which is an input variable, is controlled and converged to the first target value of 25 ° C./h. (B) In the range where the hearth temperature is higher than around 600 ° C., the hearth temperature is raised from the rate of change of the hearth temperature at the time of the first target value of 25 ° C./h to the second target value of 100 ° C./h. An explanation will be given of the fact that the hourly hearth temperature changes and rises.

As shown in FIG. 12, the hearth temperature was 600 ° C.
In a range smaller than the vicinity, the rate of increase of the hearth temperature is set to a gentle slope (first target value of 25 ° C./h). On the right side of the curved point X, the steep slope (second target value 100 ° C./h) is set. The control in (B) is the same as that in (A), and different points will be described.

In the range where the hearth temperature is greater than around 600 ° C., the second target value at which the rate of change of the hearth temperature at startup is converged is the label PL1 in the membership function group 32 of FIG.
(100 ° C./h). In the fuzzy inference unit 25, the second rule group 28B (rules 12 to 1)
6), the third rule group 28C (rules 47 to 53) is applied.

In the second rule group 28B, the correction amount of the flow rate of the auxiliary fuel for the hearth burner changes in accordance with the change in the rate of change of the hearth temperature at the time of start-up.
1 and the membership functions near it are applied and converge to the label PL1. In the third rule group 28C, the correction amount of the flow rate of the hearth gun auxiliary fuel changes in accordance with the change in the hearth temperature change rate at startup, and the hearth temperature change rate at startup is a member of the label PL1. The ship function and its surrounding membership functions are applied,
Converge on label PL1.

Second rule group 28B, third rule group 2
By applying 8C, the rate of increase in the hearth temperature changes from a gentle slope (first target value of 25 ° C./h) to a steep slope (second target value of 100 ° C./h) at the bending point X. Here, the fuzzy inference unit 25
When the rate of change of the hearth temperature at startup is small, the amount of correction of the flow rate of the bottom burner auxiliary fuel is large, and as the rate of change of the hearth temperature at startup increases, the correction amount of the flow rate of the bottom burner auxiliary fuel is small. A second rule group 28B consisting of a plurality of rules having the following relationship and the hearth gun auxiliary fuel are inferred and output as an input variable with respect to the rate of change of the hearth temperature at startup, and the rate of change of the hearth temperature at startup is small. And a third rule comprising a plurality of rules in which the correction amount of the flow rate of the hearth gun auxiliary fuel is large, and the correction amount of the flow rate of the hearth gun auxiliary fuel is small as the rate of change of the hearth temperature at startup increases. Group 28C (rules 47 to 53).

Therefore, for example, assuming that the rate of change of the hearth temperature at the time of startup is 25 ° C./h, the fuzzy inference unit 25 uses the rules 12 and 3 of the second rule group 28B.
The rule 49 of the rule group 28C is applied. Rule 1
In 2, the label is ZR and the label of the correction amount of the flow rate of the bottom burner auxiliary fuel is PL. Accordingly, the amount of correction of the flow rate of the bottom burner auxiliary fuel increases, the calorific value in the bottom 4 increases, the amount of heat transferred from the bottom 4 to the bottom 5 increases, and the bottom temperature at startup increases. The rate of change increases.

In the rule 49 of the third rule group 28C applied at the same time, the label of the correction amount of the flow rate of the hearth gun auxiliary fuel is PL. Therefore, the correction amount of the flow rate of the hearth gun auxiliary fuel increases, and the calorific value of the hearth portion 5 increases,
The rate of change in hearth temperature at startup increases. In this way, the rate of rise of the hearth temperature is gradually inclined at the bending point X (the first target value 25).
° C / h) toward a steep slope (second target value 100 ° C / h).

Then, the rate of change of the hearth temperature at startup as an input variable to be fed back is the second target value of 100 ° C.
At / h, the label becomes PL1, and the fuzzy inference unit 25 applies the rule 15 of the second rule group 28B and the rule 52 of the third rule group 28C. According to rule 15, the label of the correction amount of the bottom burner auxiliary fuel flow rate is ZR.
It has become. In the rule 52 applied at the same time, the label of the correction amount of the flow rate of the hearth gun auxiliary fuel is ZR. In this state, the temperature system is balanced.

From this balanced state, the rate of change in the hearth temperature at startup increases for some reason and the label P
When changing from L1 to, for example, the label PL2, the correction amount of the flow rate of the hearth burner auxiliary fuel changes from the label ZR to NS (rule 16). At the same time, the correction amount of the hearth gun auxiliary fuel flow rate changes from the label ZR to NM (Rule 5).
3). As a result, the amount of correction of the flow rate of the bottom burner auxiliary fuel is reduced, and the calorific value at the bottom 4 is reduced.
The amount of heat transferred from the furnace to the hearth 5 decreases, and the rate of change in the hearth temperature during startup decreases. At the same time, the amount of correction of the flow rate of the hearth gun auxiliary fuel decreases, the calorific value in the hearth section 5 decreases, the hearth temperature change rate at startup decreases, and the label P
From L2, it returns to the original convergence value (label PL1).

As described above, even when the rate of change of the hearth temperature at startup as an input variable changes and deviates from the convergence value (label PL1) as the second target value, the rate of change of the hearth temperature at startup is not changed. The state shifts to a convergence value that just keeps a good state, and the rate of change of the hearth temperature at startup converges to the original convergence value. In this state, the rate of change of the hearth temperature at startup, the correction amount of the flow rate of the hearth burner auxiliary fuel, and the correction amount of the flow rate of the hearth gun auxiliary fuel are balanced. Is determined to be appropriate as a result.

In this manner, the rate of change of the hearth temperature at startup, which is an input variable, is controlled, and the second target value 100 ° C./h
Converges. (C) The fact that the temperature difference between the hearth temperature and the hearth temperature is controlled within a range in which the hearth temperature is 200 ° C. higher than the hearth temperature will be described. Hearth temperature as input variables, temperature difference and rate of change of hearth temperature at startup, fuzzy inference unit 25, hearth burner auxiliary fuel as output variable Corrected amount of hearth, hearth indicating combustion state of controlled system The temperature system consisting of the temperature and the furnace bottom temperature forms a closed loop and converges to a balanced state. In the range where the hearth temperature is smaller than 650 ° C., the target value at which the temperature difference converges is a reference label (200 ° C. of the membership function group 31 in FIG. 7). In the fuzzy inference unit 25, the fourth rule group 28D (rule 1)
In 8), the correction amount of the hearth burner auxiliary fuel flow rate changes in response to the change in the temperature difference. The membership function of the reference label and the membership function in the vicinity are applied to the temperature difference. (200 ° C.).

Here, the fuzzy inference unit 25 (when the hearth temperature is NLL) indicates that if the temperature difference is small, the amount of correction of the flow rate of the hearth burner auxiliary fuel is large, and as the temperature difference increases, the hearth burner auxiliary fuel is increased. Has a fourth rule group 28D (rules 1 to 8) having a plurality of rules that reduce the amount of correction of the flow rate. Therefore, for example, the temperature difference as an input variable to be fed back is just improved (20
0 ° C.), the fourth rule group 28D
Rule 2 is applied. In Rule 2, the label is ZR and the label for the correction amount of the bottom burner auxiliary fuel flow rate is ZR, and the temperature system converges to a balanced state.

From this state, the temperature difference increases and the label Z
When changing from R to, for example, the label PS, the correction amount of the flow rate of the hearth burner auxiliary fuel changes from the label ZR to NS (rule 3). As a result, the correction amount of the flow rate of the furnace bottom burner auxiliary fuel is reduced, the calorific value at the furnace bottom 4 is reduced, and the amount of heat transmitted from the furnace bottom 4 to the hearth 5 is reduced. The amount decreases, the temperature difference decreases, and the label PS returns to the original convergence value (label ZR).

As described above, when the temperature difference indicating the result of the combustion state changes from the state in which the target value has reached 200 ° C., fuzzy inference is made based on these labels. The corrected amount of the flow rate of the bottom burner auxiliary fuel is output. Even if the temperature difference, which is an input variable, changes and deviates from the convergence value, which is the target value, the temperature difference shifts to a convergence value in which a good state is maintained, and the temperature difference converges to the original convergence value. In this state, the temperature difference and the correction amount of the flow rate of the hearth burner auxiliary fuel are in a balanced state, and it is determined that the temperature difference being just right is appropriate as a result.

In this way, the temperature difference, which is an input variable, is controlled and converged to the target value of 200 ° C. (D) Explain that the furnace bottom temperature is controlled to 650 ° C. in the range where the furnace bottom temperature is higher than around 600 ° C. FIG.
As shown in the figure, the furnace bottom temperature is set to the target value of 650 ° C. in the range where the furnace bottom temperature is higher than around 600 ° C. The control in (D) is the same as that in (A), and different points will be described.

In the range where the hearth temperature is higher than around 600 ° C., the target value at which the hearth temperature converges is labeled ZR (650 ° C.) in the membership function group 30 in FIG.
In the fuzzy inference unit 25, (rules 17 to 46)
Is applied. In rules 17 to 46, the correction amount of the flow rate of the bottom burner auxiliary fuel changes in accordance with the change in the bottom temperature, and the membership function of the label ZR and the membership function in the vicinity thereof are applied to the bottom temperature. , Label Z
Converge to R.

When the furnace bottom temperature as an input variable to be fed back reaches 650 ° C., the fuzzy inference unit 2
At 5, the rules 32-36 are applied. In this state, the temperature system is balanced. (2) Transition from start-up operation to steady-state operation First, input variables (hearth temperature, hearth temperature change rate at start-up)
Is input to the fuzzy inference unit 25, the selected rule is applied, and the fuzzy inference unit 25 outputs the corrected amount of the hearth burner auxiliary fuel and the corrected amount of the hearth gun auxiliary fuel. In the fuzzy inference unit 25, the knowledge 28,
By using the membership functions 29 to 35, the corrected amount of the hearth burner auxiliary fuel and the corrected amount of the hearth gun auxiliary fuel are inferred and output by well-known defuzzification.

The bottom burner auxiliary fuel valve 14 has an opening of the rotation angle corresponding to the correction amount of the flow rate of the bottom burner auxiliary fuel. The auxiliary fuel is sent to the furnace bottom burner 6 in the state of the opening degree. The furnace bottom 4 is heated by the furnace bottom burner 6. The heating of the furnace bottom 4 heats the hearth 5 above the furnace bottom 4 and raises the hearth temperature. The hearth gun auxiliary fuel valve 16 has an opening of a rotation angle corresponding to the correction amount of the flow rate of the hearth gun auxiliary fuel. The auxiliary fuel is sent to the hearth gun 10 in the state of the opening degree. When the hearth temperature reaches around 600 ° C,
The hearth section 5 is heated by the hearth burner 6 and the hearth gun 10.

The correction amount of the hearth burner auxiliary fuel flow rate and the correction amount of the hearth gun auxiliary fuel flow rate are controlled so as to obtain the rise curves of the hearth temperature and the hearth temperature in FIG. The hearth temperature, the hearth temperature, the rate of change of the hearth temperature at startup, and the rate of change of the hearth temperature in the steady state, which indicate the combustion state of the controlled system resulting from the combustion of the auxiliary fuel, are changed. The temperature is fed back to the fuzzy inference unit 25.

Hereinafter, a specific description will be given. When the hearth temperature rises and the hearth temperature label is in the NL range, the rate of change in the hearth temperature at startup is the second rule group 28B (rules 12 to 1).
6), the third rule group 28C (rules 47 to 53) is applied, and the hearth temperature change rate at the time of startup is set to the second target value 100
° C / h.

Here, the fuzzy inference unit 25 includes a plurality of rules for a relation in which the hearth gun auxiliary fuel is inferred and output with respect to the steady-state hearth temperature change rate as an input variable in the case of the label (NM). Fifth rule group 28E (54
To 60), and the second rule group 28B (rules 12 to
16), third rule group 28C (rules 47 to 53)
Holds for a label NL one step smaller than the membership function of the smallest label NM among labels in a narrow section.

The hearth temperature changes from a rising state to a steady state, but the steady state convergence value of the hearth temperature is set to a temperature range near the reference label (805 ° C.). The value is (0 ° C./h) near the reference label. Therefore, at the same time that the hearth temperature label is in the NM range, the hearth temperature membership function 29 hardly applies the membership function of the label NL (when the grade (degree of conformity) in NL is small). Has little effect on the output due to the membership function of the label NL), the membership function of the label NM is applied, and hearth gun auxiliary fuel is supplied.

When the hearth temperature label is in the range of NM,
The rate of change in the hearth temperature at the time of start-up is determined by the second rule group 28B (rules 12 to 16) and the third rule group 28C (rules 47 to 47).
53) is almost canceled (if the grades (degrees of conformity) in the labels PM, PL1, and PL2 of the hearth temperature change rate at startup are small, the labels PM, PL1, and PL2
At the same time, the steady-state hearth temperature change rate is applied, and the hearth temperature rise rate converges to the target value of 0 ° C./h. Therefore,
The hearth temperature is controlled from a rising state (steep inclination) to a steady state (horizontal angle). That is, in the fuzzy inference unit 25, in the fifth rule group 28E (rules 54 to 60), the correction amount of the flow rate of the hearth gun auxiliary fuel changes in accordance with the change in the steady-state hearth temperature change rate. Constant hearth temperature change rate is
The membership function of the reference label and the membership functions in the vicinity are applied, and the reference label (0 ° C /
h).

Thus, when the hearth temperature label is NM or more, the hearth temperature is controlled from a steep slope to a horizontal angle. The hearth temperature converges to 805 ° C., and the rate of change in the hearth temperature upon startup converges to 0 ° C./h. FIG. 13 shows the control device 2
The experimental result of the control by No. 1 is shown. In the figure, 15 ° C./h→10° C./h→30° C./h→60° C./h
The hearth temperature is controlled by the set rise rate, and the rise rate of the hearth temperature smoothly shifts from a steep angle of 60 ° C / h to a steady state (810 ° C) of 0 ° C / h in a horizontal state. Have been. It also shows that the furnace bottom temperature is about 200 ° C. higher than the furnace floor temperature.

According to the above configuration, the following effects can be obtained. First, the fuzzy inference unit 25 increases the flow rate of the bottom burner auxiliary fuel when the rate of change in the hearth temperature at startup is small,
A first rule group 28A (rules 9 to 10) comprising a plurality of rules in which the flow rate of the hearth burner auxiliary fuel decreases as the rate of change of the hearth temperature at startup increases, and the hearth temperature change at startup. The target value of the rate (25 ° C./h) is used as a reference label, and a membership function group 32 of the rate of change of the hearth temperature at startup is formed by dividing the vicinity of the target value and allocating it to a plurality of sections. Therefore, in the fuzzy inference unit 25, the first rule group 28A (rules 9-1)
0) and the membership function group 32 of the rate of change of the hearth temperature at the time of start-up, the hearth temperature can be increased at the set rate of increase (25 ° C./h).

As described above, the hearth temperature can be increased at the set rate (25 ° C./h), so that the hearth temperature and the hearth temperature are maintained until the hearth temperature reaches a steady state. Sludge incinerator 1 without ascending speed
It is possible to clearly understand when to put sludge into the furnace, and to adjust the rate of increase in the hearth temperature to speed up or slightly delay the start-up operation by setting the rate of increase in the hearth temperature. The auxiliary fuel flow of the hearth burner 6 and the hearth gun 10 can be automatically set without manual intervention by an operator, and the incineration process can be easily managed.

Then, the hearth temperature can be raised at a set rate without any manual intervention by a worker, and the operation of changing the set value of the auxiliary fuel flow rate of the hearth burner 6 and the hearth gun 10 can be performed. And the management of the incineration process can be facilitated. Further, the furnace bottom temperature and the furnace floor temperature rise in accordance with the supply amount of the auxiliary fuel of the hearth burner 6 and the hearth gun 10, so that the auxiliary fuel can be saved.

Second, the fuzzy inference unit 25 increases the flow rate of the bottom burner auxiliary fuel when the rate of change of the hearth temperature at startup is small, and increases the flow rate of the bottom furnace burner as the rate of change of the hearth temperature during startup increases. A second rule group 28 </ b> B (rules 12 to 1) including a plurality of rules related to a reduction in the fuel flow rate
6), the hearth gun auxiliary fuel is inferred with respect to the rate of change of the hearth temperature at startup as an input variable. If the rate of change of the hearth temperature at startup is small, the flow rate of the hearth gun auxiliary fuel is large, and A third rule group 28C (rules 47 to 53) composed of a plurality of rules in which the flow rate of the hearth gun auxiliary fuel decreases as the rate of change in the hearth temperature during raising increases.
Since the target values in the membership function group 32 of the rate of change of the hearth temperature at the time of startup are the first target value (25 ° C./h) and the second target value (100 ° C./h). The hearth temperature can be set to a plurality (two in this embodiment) of the rate of increase.

The hearth temperature is set to a plurality of rising rates (25 ° C./h when the hearth temperature is lower than around 600 ° C., and 100 ° C./h when the hearth temperature is higher than around 600 ° C.). By setting the rate of increase, it is easy to adjust the rate of increase in the hearth temperature, for example, to shorten or slightly delay the start-up operation, thereby making it easier to manage the incineration process.

Third, the rate of rise of the hearth temperature is 6%.
When the temperature is lower than around 00 ° C, the rate is 25 ° C / h and the hearth temperature is 6
When the temperature is higher than around 00 ° C., the rate is 100 ° C./h. Therefore, the rate of increase in the hearth temperature is changed from 25 ° C./h to 100 ° C./h with a steep slope, and the time for the start-up operation of the hearth temperature is reduced. Can be shortened. Fourth, the fuzzy inference unit 25 determines that the hearth temperature is N
In the case of LL, if the temperature difference is small, the flow rate of the bottom burner auxiliary fuel is large, and the fourth rule group 28D (1) having a plurality of rules such that the flow rate of the bottom burner auxiliary fuel decreases as the temperature difference increases. 8), the hearth temperature and the target value of the hearth temperature (200 ° C.) are used as a reference label, and the vicinity of the reference label is divided and divided into a plurality of sections to form a membership function group 31 of temperature differences. Therefore, the temperature difference between the hearth temperature and the hearth temperature is calculated by the fourth rule group 28D (rules 1 to 8) and the membership function group 31 of the temperature difference. 200 from hearth temperature
Can be controlled within a high range.

Therefore, it is possible to suppress an increase in the furnace bottom temperature alone, prevent damage in the furnace 2 due to a difference in thermal expansion, and improve the durability of the sludge incinerator 1. Fifth, the fuzzy inference unit 25 uses the hearth temperature obtained by the feedback, the hearth temperature change rate at startup and the steady-state hearth temperature change rate per unit time obtained from the hearth temperature as input variables, The target value (805 ° C) of the hearth temperature in the steady state is used as a reference label, and a plurality of labels (NM, NS, ZR, PS) are divided in a narrow section (788 ° C to 815 ° C) by dividing the vicinity of the target value. Allocated and formed, the smallest label N among labels in a narrow section
The membership function of M and the membership function of the label NL which is one step smaller than the membership function of the label NM and the membership function group 29 of the hearth temperature which do not substantially overlap with each other, Target value (0 ° C /
h) is used as a reference label, and a steady-state hearth temperature change rate membership function group 33 formed by dividing the vicinity of the target value and assigning it to a plurality of sections (NM, NS, ZR, PS, PM). In the case of the smallest label NM among the labels in the narrow section, a fifth rule composed of a plurality of rules of a relationship in which the hearth gun auxiliary fuel is inferred and output with respect to the steady-state hearth temperature change rate as an input variable. Group 28E (rules 54 to 60), a second rule group 28B (rules 12 to 16), and a third rule group 28C (rule 47).
53) are formed by a label NL which is one step smaller than the membership function of the smallest label NM among the labels in the narrow section. The application of the second rule group 28C (rules 12 to 16) and the third rule group 28C (rules 47 to 53) in the hearth temperature change rate is almost canceled (the label PM of the hearth temperature change rate at startup). , PL1, PL
In the case where the grade (degree of conformity) in No. 2 is small, the influence of the membership function of the labels PM, PL1, and PL2 on the output is small, and at the same time, the steady-state hearth temperature change rate is applied. Therefore, the rate of increase in the hearth temperature is converged to the target value of 0 ° C./h, and the hearth temperature can be controlled from a rising state (steep inclination) to a steady state (horizontal).

As described above, the hearth temperature of the hearth section 5 can be controlled from the rising state to the steady state. Therefore, by using the hearth temperature obtained by the feedback, the hearth temperature change rate at startup and the steady-state hearth temperature change rate per unit time obtained from the hearth temperature as input variables, the The floor temperature can be smoothly controlled from a rising state to a steady state.

As a result, a smooth transition can be made from the start-up operation to the steady operation, and the operation of stopping the furnace bottom burner 6 and the operation of pouring sludge into the furnace are performed at the optimal timing, thereby reducing the temperature of the furnace floor. Convergence to the target value in the shortest time can prevent waste of fuel, damage in the furnace, and delay of incineration work. Sixth, control of multiple input variables and multiple output variables can be easily performed by fuzzy inference.

In the present embodiment, the target values in the membership function group of the rate of change in the hearth temperature at startup are two, the first target value and the second target value. The hearth temperature can be set to three or more rise rates. Further, in the present embodiment, the temperature difference between the hearth temperature and the hearth temperature converges to 200 ° C., but is not limited to 200 ° C. Any temperature difference can be used. Further, the temperature difference does not necessarily have to be a constant value of 200 ° C. That is, the rise rate of the furnace bottom temperature and the rise rate of the hearth temperature need not be the same value.

In the present embodiment, the flow rate of the furnace bottom burner auxiliary fuel output by the fuzzy inference unit 25 includes the correction amount of the flow rate of the furnace bottom burner auxiliary fuel.
By adjusting the flow rate of the bottom burner auxiliary fuel, the valve 1 for the bottom burner auxiliary fuel is adjusted to the opening of the rotation angle corresponding to them.
4 is adjusted, but the absolute value of the flow rate of the hearth burner auxiliary fuel may be used as the flow rate of the hearth burner auxiliary fuel. In the present embodiment, the flow rate of the hearth gun auxiliary fuel output by the fuzzy inference unit 25 is as follows.
The correction amount of the flow rate of the hearth gun auxiliary fuel is listed, and the correction amount of the flow rate of the hearth gun auxiliary fuel adjusts the valve 16 for the hearth gun auxiliary fuel to the opening degree of the rotation angle corresponding thereto. The flow rate of the hearth gun auxiliary fuel may be an absolute value of the flow rate of the hearth gun auxiliary fuel.

Further, in the present embodiment, the control is performed by the multi-input, multi-output fuzzy inference unit 25, but the present invention is not limited to such control. For example, a start-up operation in which the values of the hearth temperature, the hearth temperature, the temperature difference between the hearth temperature and the hearth temperature, the rate of change of the hearth temperature at startup, and the rate of change of the hearth temperature during steady state are described in a multi-element matrix. And a storage device for storing the optimum flow rate of the bottom hearth burner auxiliary fuel and the flow rate of the hearth gun auxiliary fuel corresponding to this optimum combination table. The flow rate of the hearth burner auxiliary fuel and the flow rate of the hearth gun auxiliary fuel can also be controlled.

[0133]

According to the first aspect of the present invention, the hearth temperature can be increased at a set rate, so that the hearth temperature and the hearth temperature are maintained until the hearth temperature reaches a steady state. It is possible to clearly understand the timing of sludge introduction into the sludge incinerator without having to rely on the temperature rise rate, and to make the start-up operation time faster or slightly delayed. The rate of rise of the hearth temperature can be adjusted only by setting the rate of rise of the hearth temperature, and the flow rate of the auxiliary fuel for the hearth burner and hearth gun can be automatically set without manual intervention by the operator. The incineration process can be easily managed.

Further, the operation of changing the set value of the flow rate of the auxiliary fuel for the hearth burner and the hearth gun is eliminated, and the management of the incineration process can be facilitated. Further, the furnace bottom temperature and the hearth temperature rise in accordance with the supply amount of the auxiliary fuel for the hearth burner and the hearth gun, and the auxiliary fuel can be saved. According to the second aspect of the invention, the same effect as that of the first aspect of the invention is obtained.

In addition, since the hearth temperature is set to a plurality of rise rates, it is easy to adjust the rise rate of the hearth temperature to make the start-up operation time earlier or slightly delayed. The management of the incineration process can be made easier. According to the third aspect of the invention, the same effect as the first or second aspect of the invention is obtained.

In addition, by changing the rate of increase in the hearth temperature to a steep slope, the time required for the startup operation of the hearth temperature can be shortened. According to the fourth aspect of the invention, the same effects as those of the first to third aspects of the invention are obtained. In addition, the temperature difference between the hearth temperature and the hearth temperature can be controlled within a range where the hearth temperature is 300 ° C. higher than the hearth temperature. Therefore, it is possible to suppress an increase in only the furnace bottom temperature, prevent damage in the furnace due to a difference in thermal expansion, and improve durability of the sludge incinerator.

According to the fifth aspect of the present invention, the same effects as those of the first to fourth aspects of the invention are obtained. In addition, the hearth temperature obtained at the time of start-up and the steady-state hearth temperature change rate per unit time obtained from the hearth temperature obtained from the feedback, The hearth temperature can be controlled from a startup state to a steady state.

As a result, the operation can smoothly transition from the start-up operation to the steady operation, and the operation of stopping the furnace bottom burner and the operation of introducing sludge into the furnace are performed at the optimum timing, and the temperature of the hearth temperature can be controlled. The values can be converged in the shortest time to prevent waste of fuel, damage in the furnace, and delay of incineration work. According to the sixth aspect of the present invention, the same effects as those of the first to fifth aspects of the invention are obtained.

In addition, a multi-input variable,
Control of multiple output variables can be performed easily. According to the seventh aspect of the present invention, the fuzzy inference unit increases the flow rate of the bottom burner auxiliary fuel when the rate of change of the hearth temperature at startup is small, and increases the hearth temperature as the rate of change of the hearth temperature during startup increases. A first rule group including a plurality of rules related to a decrease in the flow rate of the burner auxiliary fuel, and a target value of the rate of change of the hearth temperature at the time of start-up being used as a reference label and dividing the vicinity of the target value into a plurality of sections. The fuzzy inference unit has a first rule group and a membership of the hearth temperature change rate at startup in the fuzzy inference unit. By applying the function group, the hearth temperature is increased at a set rate,
An effect similar to that of the first aspect is obtained.

According to the eighth aspect of the present invention, the same effect as the effect of the fuzzy inference unit in the seventh aspect of the invention can be obtained. According to the ninth aspect of the present invention, the fuzzy inference unit increases the flow rate of the hearth burner auxiliary fuel when the rate of change of the hearth temperature at startup is small, and increases the hearth temperature as the rate of change of the hearth temperature during startup increases. A second rule group consisting of a plurality of rules relating to a decrease in the flow rate of the burner auxiliary fuel; and a hearth gun auxiliary fuel inferred and output as an input variable for the hearth temperature change rate at startup. A third rule consisting of a plurality of rules related to a relationship in which the flow rate of the hearth gun auxiliary fuel is large when the floor temperature change rate is small, and the flow rate of the hearth gun auxiliary fuel is reduced as the hearth temperature change rate at startup increases. The target value in the membership function group of the hearth temperature change rate at start-up is plural, so that the hearth temperature can be set to plural raise rates. Has the same effect as the invention of

According to the tenth aspect, the ninth aspect is provided.
The same effect as the effect by the fuzzy inference unit in the described invention is exerted. According to the eleventh aspect of the present invention, the fuzzy inference unit includes a plurality of pieces of the relationship that the flow rate of the bottom burner auxiliary fuel increases when the temperature difference is small, and the flow rate of the bottom burner auxiliary fuel decreases as the temperature difference increases. A fourth rule group having a rule, a temperature formed by dividing a vicinity of the reference label into a plurality of sections by dividing the vicinity of the reference label into a plurality of sections while using a target temperature difference between the hearth temperature and the hearth temperature (within 300 ° C.) as a reference label. Since it has the difference membership function group, the temperature difference between the hearth temperature and the hearth temperature is calculated by the fourth rule group and the membership function group of the temperature difference. It can be controlled within the range 300 ° C. higher than the temperature. Therefore,
The same effect as that of the fourth aspect is obtained.

According to the twelfth aspect, according to the first aspect,
The same effect as the effect by the fuzzy inference unit in the invention described in 1 is achieved. According to the thirteenth aspect of the present invention, the fuzzy inference unit calculates the hearth temperature obtained at the time of feedback, the rate of change of the hearth temperature at start-up, and the rate of change of the hearth temperature during the steady state with respect to a unit time obtained from the hearth temperature. Is used as an input variable, and a target value of the hearth temperature in a steady state is used as a reference label, and a plurality of labels are formed by allocating a plurality of labels to a narrow section by dividing the vicinity of the target value, for example, The label NM membership function and the membership function of the label NL which is one stage smaller than the membership function of the label NM, for example, are a membership function group of hearth temperatures that are not substantially overlapping, and a membership function group of the hearth temperature change rate in a steady state. A membership function group for the steady-state hearth temperature change rate formed by dividing the vicinity of the target value into a plurality of sections while using the target value as a reference label, In the case of the smallest label (NM) among the labels of the section, a fifth rule composed of a plurality of rules relating to a relationship in which the hearth gun auxiliary fuel is inferred and output with respect to the steady-state hearth temperature change rate as an input variable. And the second rule group and the third rule group have the smallest label (N
M), the label of the hearth temperature is NM
, The application of the hearth temperature change rate at startup is almost canceled (for example, the label P of the hearth temperature change rate at startup).
When the grades (degrees of conformity) in M, PL1, and PL2 are small, the influence on the output by the membership functions of the labels PM, PL1, and PL2 is small.
The constant hearth temperature change rate is applied, and the hearth temperature rise rate converges to a target value (for example, 0 ° C./h). The hearth temperature can be controlled from a rising state (steep inclination) to a steady state (horizontal angle).

As described above, the hearth temperature of the hearth is controlled from the start-up state to the steady state, and the same effect as the fifth aspect of the present invention can be obtained. According to the fourteenth aspect, the same effect as the effect of the fuzzy inference unit in the thirteenth aspect can be obtained.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a sludge incinerator according to the present embodiment.

FIG. 2 is a configuration diagram showing a start-up operation control device of the sludge incinerator.

FIG. 3 is a block diagram showing a signal flow in the start-up operation control device.

FIG. 4 is a diagram showing a membership function group of hearth temperatures in a fuzzy inference unit of the start-up operation control device.

FIG. 5 is an enlarged view showing a membership function group near a label ZR in a steady state of the hearth temperature in FIG. 4;

FIG. 6 is a diagram showing a membership function group of a furnace bottom temperature in a fuzzy inference unit of the start-up operation control device.

FIG. 7 is a diagram showing a membership function group of a temperature difference between the hearth temperature and the hearth temperature in FIG. 4;

FIG. 8 is a diagram showing a membership function group of a hearth temperature change rate at startup in a fuzzy inference unit of the startup operation control device.

FIG. 9 is a diagram showing a membership function group of a steady-state hearth temperature change rate in a fuzzy inference unit of the start-up operation control device.

FIG. 10 is a diagram showing a membership function group of a correction amount of a flow rate of a bottom burner auxiliary fuel in a fuzzy inference unit of the start-up operation control device.

FIG. 11 is a diagram showing a membership function group of the correction amount of the flow rate of the hearth gun auxiliary fuel in the fuzzy inference unit of the start-up operation control device.

FIG. 12 is a diagram showing a target temperature rise curve of a furnace bottom temperature and a furnace floor temperature by a control method using the start-up operation control device of the sludge incinerator.

FIG. 13 is a data diagram showing experimental results obtained by a control method using the start-up operation control device for the sludge incinerator.

FIG. 14 is a configuration diagram showing a conventional sludge incinerator.

FIG. 15 is an explanatory diagram showing a method of controlling a furnace bottom temperature and a furnace bed temperature of a conventional sludge incinerator.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Sludge incinerator 4 Hearth bottom 5 Hearth part 6 Hearth burner 10 Hearth gun 11 Hearth temperature sensor 12 Hearth temperature sensor 14 Hearth burner auxiliary fuel valve 16 Hearth gun auxiliary fuel valve 21 Control device 22 Standing Heating hearth temperature change rate calculation means during raising 23 Steady hearth temperature change rate calculation means 24 Temperature difference calculation means 25 Fuzzy inference unit 26 Hearth burner valve operation amount calculation means 27 Hearth gun valve operation amount calculation means 29 Hearth Membership function group of temperature 30 Membership function group of hearth temperature 31 Membership function group of temperature difference between hearth temperature and hearth temperature 32 Membership function group of hearth temperature change rate at start-up 33 Constant hearth Membership function group of temperature change rate 34 Membership function group of correction amount of hearth burner auxiliary fuel flow rate 35 Membership function group 36 fuzzy inference engine

──────────────────────────────────────────────────続 き Continuing on the front page (51) Int.Cl. ⁶ Identification symbol FI G05B 13/02 G05B 13/02 N (72) Inventor Kazuaki Iijima 1-4-1, Yurakucho, Chiyoda-ku, Tokyo Sanki Industrial Co., Ltd. Within the company (72) Inventor Kaoru Kato 1-4-1, Yurakucho, Chiyoda-ku, Tokyo Sanki Kogyo Co., Ltd. (72) Inventor Satoshi Sasaki 1-4-1, Yurakucho, Chiyoda-ku, Tokyo Sanki Kogyo Co., Ltd.

Claims (14)

[Claims] 1. A furnace bottom is heated by a furnace bottom burner, thereby heating a hearth disposed above the furnace bottom to increase the hearth temperature. When the hearth temperature reaches a predetermined temperature, the furnace is heated. In the start-up operation control method of a sludge incinerator, which heats the hearth by heating the hearth with a bottom burner and hearth gun, the hearth temperature obtained by feedback and the unit time obtained by the hearth temperature Using the hearth temperature change rate at startup as an input variable and controlling the hearth burner auxiliary fuel flow rate and hearth gun auxiliary fuel flow rate as output variables, raise the hearth temperature at the set rate of rise. A method for controlling a start-up operation of a sludge incinerator, comprising: 2. The method for controlling a start-up operation of a sludge incinerator according to claim 1, wherein the hearth temperature is set to a plurality of rising rates. 3. The method for controlling a start-up operation of a sludge incinerator according to claim 1, wherein the hearth temperature is set to a rising rate that changes from a gentle slope to a steep slope. 4. The sludge incinerator according to claim 1, wherein a temperature difference between the furnace bottom temperature and the hearth temperature is added within 300 ° C. to the input variables of the control. Start-up operation control method. 5. The sludge according to claim 1, wherein a rate of change in the steady-state hearth temperature per unit time obtained from the hearth temperature is added to the control input variable. Start-up operation control method for incinerator. 6. The method according to claim 1, wherein the control is performed by fuzzy inference. 7. A furnace bottom is heated by a furnace bottom burner, thereby heating a hearth disposed above the furnace bottom to increase the hearth temperature. When the furnace bottom burner,
A hearth temperature sensor for detecting the temperature of the hearth of the sludge incinerator, in a start-up operation control device for the sludge incinerator, which heats the hearth with a hearth gun to raise the hearth temperature; And a hearth burner auxiliary fuel valve and a hearth gun auxiliary fuel valve connected to the output side of the control device. The control device includes a hearth obtained by feedback. Calculating means of the rate of change of the hearth temperature at start-up per unit time based on the temperature, and means for calculating the rate of change of the hearth temperature at start-up; And a fuzzy inference unit for inferring and outputting the flow rate of the bottom burner auxiliary fuel for determining the degree of opening, and the flow rate of the hearth gun auxiliary fuel for determining the opening degree of the hearth gun auxiliary fuel valve. When the floor temperature change rate is small A first rule group consisting of a plurality of rules related to a relationship in which the flow rate of the bottom burner auxiliary fuel is large and the flow rate of the bottom burner auxiliary fuel decreases as the rate of change in the hearth temperature at startup increases; The target function of the temperature change rate is used as a reference label, and the membership function group of the hearth temperature change rate at startup which is formed by dividing the vicinity of the target value and dividing it into a plurality of sections is formed. Characteristic sludge incinerator start-up operation control device. 8. A hearth temperature change rate at the time of startup is input. If the hearth temperature change rate at the time of startup is small, the flow rate of the bottom burner auxiliary fuel is large, and the hearth temperature change rate at the time of startup becomes large. A first rule group including a plurality of rules related to a decrease in the flow rate of the hearth burner auxiliary fuel, and a target value of the rate of change in the hearth temperature at the time of start-up being used as a reference label and dividing the vicinity of the target value into a plurality of groups. Fuzzy inference in light of the membership function group of the rate of change of the hearth temperature at startup which is formed by allocating to the section of, and the flow rate of the hearth burner auxiliary fuel, which determines the opening of the hearth burner auxiliary fuel valve, A medium that records a fuzzy inference combustion control program in which a computer in a fuzzy inference unit functions so as to output a flow rate of the hearth gun auxiliary fuel that determines the opening of the hearth gun auxiliary fuel valve. 9. The fuzzy inference unit according to claim 7, wherein the lower the rate of change of the hearth temperature at startup, the larger the flow rate of the bottom burner auxiliary fuel, and the lower the rate of change of the hearth temperature at start-up. A second rule group consisting of a plurality of rules related to a decrease in the flow rate of the burner auxiliary fuel, and a hearth gun auxiliary fuel inferred and output for the hearth temperature change rate at startup as an input variable. The third rule, which is based on a plurality of rules, is that when the hearth temperature change rate is small, the flow rate of the hearth gun auxiliary fuel is large, and the flow rate of the hearth gun auxiliary fuel is reduced as the hearth temperature change rate at startup increases. A start-up operation control device for a sludge incinerator, comprising: a set of rules; and a plurality of target values in a group of membership functions for a rate of change in the hearth temperature at startup. 10. A rate of change of the hearth temperature at the time of startup is input. If the rate of change of the hearth temperature at the time of startup is small, the flow rate of the bottom burner auxiliary fuel increases, and the rate of change of the hearth temperature at the time of startup increases. A first rule group consisting of a plurality of rules related to a decrease in the flow rate of the hearth burner auxiliary fuel, and a flow rate of the hearth burner auxiliary fuel being large when the rate of change in the hearth temperature at startup is small, and A second rule group consisting of a plurality of rules in which the flow rate of the hearth burner auxiliary fuel decreases as the temperature change rate increases, and a heart rate gun assist rate with respect to the startup hearth temperature change rate as an input variable. When the fuel is inferred and the hearth temperature change rate at startup is small, the flow rate of the hearth gun auxiliary fuel is large, and the flow rate of the hearth gun auxiliary fuel decreases as the hearth temperature change rate at startup increases. From multiple rules of A plurality of third rule groups and target values are formed, and the target value of the rate of change in the hearth temperature at startup is used as a reference label, and the vicinity of the target value is divided and divided into a plurality of sections. Fuzzy reasoning is performed in light of the membership function group of the rate of change of the hearth temperature at startup, and the flow rate of the hearth burner auxiliary fuel, which determines the opening of the hearth burner auxiliary fuel valve, A medium that records a fuzzy inference combustion control program in which a computer in a fuzzy inference unit functions so as to output the flow rate of the hearth gun auxiliary fuel that determines the opening degree. 11. A control device according to claim 7, further comprising a temperature difference calculating means for calculating a temperature difference between the hearth temperature and the hearth temperature, wherein the fuzzy inference unit according to claim 7 or 9 comprises: When the temperature difference is small, the flow rate of the bottom burner auxiliary fuel is large,
A fourth rule group having a plurality of rules in which the flow rate of the bottom burner auxiliary fuel decreases as the temperature difference increases; and a target label of the bottom temperature and the bottom temperature as a reference label and a vicinity of the reference label. And a membership function group of a temperature difference formed by dividing the temperature into a plurality of sections and dividing the temperature into a plurality of sections. 12. The rate of change of the hearth temperature at start-up and the temperature difference are inputted. If the rate of change of the hearth temperature at start-up is small, the flow rate of the bottom burner auxiliary fuel is large, and the rate of change of the hearth temperature at start-up is reduced. A first rule group consisting of a plurality of rules in which the flow rate of the bottom burner auxiliary fuel decreases as the size increases, and the flow rate of the bottom burner auxiliary fuel increases when the rate of change in the hearth temperature during startup is small, and A second rule group consisting of a plurality of rules related to a decrease in the flow rate of the bottom burner auxiliary fuel as the rate of change in the hearth temperature increases when the hearth temperature change rate at startup increases as the input variable. If the floor gun auxiliary fuel is inferred and the hearth temperature change rate at startup is small, the flow rate of the hearth gun auxiliary fuel is large, and as the hearth temperature change rate at startup increases, the flow rate of the hearth gun auxiliary fuel increases. Multiple relations in a smaller relationship And a fourth rule group having a relationship that the flow rate of the bottom burner auxiliary fuel increases when the temperature difference is small and the flow rate of the bottom burner auxiliary fuel decreases as the temperature difference increases. A set of rules and a set of target values are formed, and the target value of the rate of change of the hearth temperature at the time of start-up is used as a reference label, and the vicinity of the target value is divided and divided into a plurality of sections to be formed. Membership function group of hearth temperature change rate and membership of temperature difference formed by dividing the vicinity of the reference label into multiple sections by using the hearth temperature and the target value of the hearth temperature as reference labels Fuzzy inference in light of the function group and the flow rate of hearth burner auxiliary fuel to determine the opening of the hearth burner auxiliary fuel valve and the flow rate of the hearth gun auxiliary fuel to determine the opening of the hearth gun auxiliary fuel valve Out To manner, medium recording fuzzy inference combustion control program a computer to function in the fuzzy inference unit. 13. The controller according to claim 7, further comprising: a steady-state hearth temperature change rate calculating means for calculating a steady-state hearth temperature change rate per unit time obtained based on the hearth temperature. The fuzzy inference unit according to any one of claims 7 to 11 uses the constant hearth temperature change rate as an input variable, uses the target temperature difference of the steady state hearth temperature as a reference label, and divides the vicinity of the target value. Are formed by allocating a plurality of labels to a narrow section, and the membership function of the smallest label among the labels of the narrow section and the membership function of the next lower label adjacent to the membership function of this label substantially overlap. It is formed by assigning a group of membership functions for the hearth temperature that does not exist and the target value of the rate of change in the hearth temperature at regular times as a reference label, and dividing the vicinity of the target value into multiple sections. In the case of the membership function group of constant hearth temperature change rate and the smallest label among the labels in the narrow section of the hearth temperature membership function group, the steady-state hearth temperature change rate as an input variable And a fifth rule group consisting of a plurality of rules related to a relation in which the hearth gun auxiliary fuel is inferred and output. The second rule group and the third rule group are the smallest of labels in a narrow section. A start-up operation control device for a sludge incinerator, wherein the start-up operation control device is constituted by a label one step smaller than a label membership function. 14. The rate of change of the hearth temperature at start-up, the temperature difference, and the rate of change of the hearth temperature at steady state are inputted. A first rule group consisting of a plurality of rules in which the flow rate of the hearth burner auxiliary fuel decreases as the rate of change of the hearth temperature at startup increases, It consists of a number of rules in which the flow rate of the bottom burner auxiliary fuel decreases as the fuel flow rate increases and the hearth temperature change rate at startup increases.The membership function of the smallest label among the labels in a narrow section A second set of rules, which is formed by a label one step smaller adjacent to and a hearth gun auxiliary fuel is inferred and output for the hearth temperature change rate at startup as an input variable, and the hearth temperature at startup is Small change rate The flow rate of the hearth gun auxiliary fuel is large, and the flow rate of the hearth gun auxiliary fuel decreases as the rate of change in the hearth temperature at startup increases. The third rule group, which is established by a label one step smaller adjacent to the membership function of the above, is that if the temperature difference is small, the flow rate of the bottom burner auxiliary fuel is large, and as the temperature difference becomes large, the bottom burner auxiliary fuel is reduced. In the case of a fourth rule group having a plurality of rules related to a decrease in flow rate and the smallest label among labels in a narrow section of the membership function group of the hearth temperature, the steady-state hearth temperature as an input variable A fifth rule group consisting of a plurality of rules relating to a relationship in which the hearth gun auxiliary fuel is inferred and output with respect to the rate of change, and a plurality of target values are constituted. Membership function group of rate of change of hearth temperature at start-up, which is formed by dividing the vicinity of the target value into multiple sections by using the target value as the reference label, and the target values of the hearth temperature and the hearth temperature Is used as the reference label, the membership function group of the temperature difference formed by dividing the vicinity of the reference label and dividing it into a plurality of sections, and the target temperature difference of the steady state hearth temperature as the reference label and the target value Is formed by dividing the neighborhood of, and assigning a plurality of labels to a narrow section, the membership function of the smallest label among the labels of the narrow section and the membership function of the next smaller label adjacent to the membership function of this label Is used as a reference label with the hearth temperature membership function group that does not substantially overlap with the target value of the steady-state Fuzzy inference in light of the membership function group of the rate of change of the hearth temperature in the steady state formed by allocating to the section of, and the flow rate of the hearth burner auxiliary fuel, which determines the opening of the hearth burner auxiliary fuel valve, A medium storing a fuzzy inference combustion control program in which a computer in a fuzzy inference unit functions so as to output a flow rate of a hearth gun auxiliary fuel that determines an opening of a floor gun auxiliary fuel valve.