JP2001208324A - Method for determining target remaining amount of refuse in refuse incinerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten an adjustment period in the operation of a refuse incinerator, and to reduce the load of persons who carry out adjustment by obtaining a target remaining amount of refuse based on past operation result data. SOLUTION: In this method for determining the target remaining amount of refuse in an incinerator that burns refuse 3 while the remaining amount of the refuse is maintained constantly on a combustion fire lattice 5, the average value of vapor flowrate of vapor being generated by an exhaust gas being generated by the incineration of the refuse 3 in an operation cycle immediately before is obtained, and a negative correction value being set based on the average value of vapor flow rate and a target vapor flow rate is added to the target remaining amount of the refuse being set in the operation cycle immediately before when the average value of vapor flowrate is larger than the preset target vapor flowrate. On the other hand, when the average value of vapor flowrate is smaller than the target, a positive correction value being set based on the average value of vapor flowrate and the target vapor flowrate is added, thus calculating the target remaining amount of the refuse of the next operation cycle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for determining a target amount of waste retained in a refuse incinerator, and more particularly, to a method for controlling the amount of retained refuse on a combustion grate in a refuse incinerator having a combustion grate. The present invention relates to a method for determining a target garbage retention amount at the time of control.

[0002]

2. Description of the Related Art Waste incinerators play an important role in treating various wastes discharged in daily life.

[0003] In recent years, interest in recovering enormous heat energy generated by the incineration of waste as waste has increased, and a waste incinerator equipped with a boiler power generation facility has been put into practical use.

In a refuse incinerator provided with such a boiler power generation facility, refuse introduced into the hopper by a crane or the like is carried into the furnace by a dust supply device provided at the bottom of the hopper. The combustion grate in the furnace has, for example, a structure in which fixed parts and movable parts are alternately arranged with a certain inclination in the refuse sending direction.

[0005] The refuse supplied to the furnace by this dust supply device is placed on a combustion grate. Then, the combustion grate provided at an inclination is moved in this inclination direction. A wind box is disposed below the combustion grate, and the wind box is supplied with combustion air from a combustion air fan.

[0006] The refuse is efficiently burned by combustion air blown from below in the process of moving on the combustion grate in the inclined direction. The exhaust gas generated by the combustion of the refuse is guided to the chimney and discharged out of the furnace. During this discharging process, the heat of the exhaust gas is recovered by a steam generating boiler.

[0007] In the incinerator with such a configuration, in order to stabilize the amount of generated steam which directly affects the stabilization of the amount of generated electric power, or to stabilize the temperature at the furnace outlet which is closely related to the generation of dioxin. Automatic combustion control for controlling the combustion state to be constant is performed.

[0008] Specifically, there are adjustment of the amount of combustion air supplied to the combustion grate, adjustment of the moving speed of the combustion grate, adjustment of the amount of refuse supplied, adjustment of the amount of refuse accumulated on the combustion grate, and the like. Conventionally, it has been recognized that for stable combustion, it is important to stabilize the amount of dust retained on a combustion grate to a constant amount (Japanese Patent Application No. 9-181153).

[0009]

However, such a conventional refuse incinerator has the following problems.

[0010] That is, in a conventional refuse incinerator, a skilled garbage incinerator coordinator can determine how much the target garbage retention amount, which is the target value of the garbage retention amount, should be optimized for several days. It is performed by checking the combustion state by spending an adjustment period of up to several months, and determining the target waste retention amount while repeating fine adjustment based on experience and feeling.

Therefore, the operation of the waste incinerator is not only stable until the target waste retention amount is determined,
There is a problem that the operation rate of the waste incinerator is reduced by spending a long time adjusting the target waste accumulation amount.

[0012] Further, since the target waste accumulation amount is determined by the experience and feeling of the coordinator, there is also a problem that the coordinator is greatly burdened.

The present invention has been made in view of such circumstances, and a target waste accumulation amount determined by a skilled waste incinerator coordinator over time based on past operation results data. Accordingly, it is an object of the present invention to provide a method for determining a target waste accumulation amount in a refuse incinerator capable of shortening the adjustment period in the operation of the refuse incinerator and reducing the burden on the coordinator.

[0014]

Means for Solving the Problems In order to achieve the above object, the present invention takes the following measures.

That is, the invention according to claim 1 is a method for determining a target amount of retained garbage in a refuse incinerator that incinerates garbage while keeping the amount of garbage retained on a combustion grate,
The average value of the steam flow rate of the steam generated by the exhaust gas generated by the incineration of the refuse in the immediately preceding operation cycle is obtained, and the average value of the steam flow rate is larger than the predetermined target steam flow rate in the target waste accumulation amount set in the immediately preceding operation cycle. In this case, a negative correction value set based on the steam flow average value and the target steam flow is added, and when the steam flow average value is smaller than the target steam flow, the steam flow average value and the target steam flow are compared. By adding a positive correction value set based on this, the target waste accumulation amount in the next operation cycle is calculated.

According to a second aspect of the present invention, there is provided a method for determining a target waste retention amount in a waste incinerator for incinerating waste while keeping the waste retention amount constant on a combustion grate, comprising: The average temperature of the exhaust gas at the outlet of the incinerator from which the exhaust gas is discharged is determined, and the average temperature of the exhaust gas at the furnace is set to the target waste retention amount set in the immediately preceding operation cycle. If the outlet exhaust gas temperature upper limit reference value is larger than the furnace outlet exhaust gas temperature average value and a negative correction value set based on the furnace outlet exhaust gas temperature upper limit reference value, the furnace outlet exhaust gas temperature average value is determined in advance If the temperature is lower than the furnace outlet exhaust gas temperature lower limit reference value, a positive correction value set based on the furnace outlet exhaust gas temperature average value and the furnace outlet exhaust gas temperature lower limit reference value is added to determine the value of the next operation cycle. To calculate the garbage retention amount.

According to a third aspect of the present invention, there is provided a method for determining a target amount of retained refuse in a refuse incinerator for incinerating refuse while maintaining the amount of refuse on the combustion grate, the method comprising: The temperature average value is obtained, and if the temperature average value of the combustion grate is larger than a predetermined combustion grate temperature reference value, the target gust retention amount set in the immediately preceding operation cycle is equal to the temperature average value of the combustion grate. By adding a positive correction value set based on the combustion grate temperature reference value, the target waste accumulation amount in the next operation cycle is calculated.

According to a fourth aspect of the present invention, there is provided a method for determining a target amount of retained garbage in a refuse incinerator for incinerating refuse on a combustion grate while keeping the amount of refuse constant, the method comprising: Obtain the exhaust gas residence time, which is the residence time of the exhaust gas at or above the temperature in the refuse incinerator, and when the exhaust gas residence time is smaller than the predetermined exhaust gas retention reference time to the target waste retention amount set in the immediately preceding operation cycle, Calculates a target waste retention amount in the next operation cycle by adding a positive correction value set based on the exhaust gas retention time and the exhaust gas retention reference time.

According to a fifth aspect of the present invention, there is provided a method for determining a target amount of retained refuse in a refuse incinerator for incinerating refuse while maintaining the amount of refuse on the combustion grate, the method comprising: Temperature average value, average value of steam flow rate of steam generated by exhaust gas generated by incineration of refuse, average temperature value of furnace exit exhaust gas which is average temperature value of exhaust gas at incinerator outlet where exhaust gas is discharged from refuse incinerator, And the exhaust gas residence time, which is the residence time of the exhaust gas at or above the predetermined reference temperature in the waste incinerator, is calculated. If it is larger than the flow rate, the first set based on the average steam flow rate and the target steam flow rate
If the steam flow average is smaller than the target steam flow, a first positive correction value set based on the steam flow average and the target steam flow is added, and the furnace outlet exhaust gas is added. If the temperature average value is larger than a predetermined furnace outlet exhaust gas temperature upper limit reference value, a second negative correction value set based on the furnace outlet exhaust gas temperature average value and the furnace outlet exhaust gas temperature upper limit reference value is further added. In addition, when the furnace outlet exhaust gas temperature average value is smaller than a predetermined furnace outlet exhaust gas temperature lower limit reference value, the second corrector set based on the furnace outlet exhaust gas temperature average value and the furnace outlet exhaust gas temperature lower limit reference value. If the average value of the temperature of the combustion grate is larger than a predetermined combustion grate temperature reference value, the correction value is set based on the temperature average value of the combustion grate and the combustion grate temperature reference value. The third positive correction value When the exhaust gas retention time is smaller than a predetermined exhaust gas retention reference time, a fourth positive correction value set on the basis of the exhaust gas retention time and the exhaust gas retention reference time is further added, so that the next operation cycle Calculate the target waste accumulation amount.

Therefore, in the method for determining the target waste accumulation amount according to the first to fifth aspects of the present invention, the target waste accumulation amount is automatically adjusted based on the measured value obtained while operating the waste incinerator. be able to.

According to a sixth aspect of the present invention, there is provided a method for determining a target waste retention amount in a waste incinerator according to the fifth aspect,
The target waste accumulation amount in the past operation cycle, the lower calorific value of refuse that is the calorific value per unit weight of refuse containing moisture,
The amount of refuse supplied, which is the amount of refuse supplied to the refuse incinerator per unit time, is stored in association with each other, and based on the stored target refuse retention amount, refuse lower heating value, and refuse supply amount in the past operation cycle. Then, a function that expresses the target waste accumulation amount by the lower heat generation amount and the dust supply amount is obtained, and the target waste accumulation amount in the next operation cycle is calculated using this function.

Therefore, in the method for determining the target waste accumulation amount according to the sixth aspect of the present invention, the target waste accumulation amount is determined based on a function consisting of the lower heat generation amount and the dust supply amount calculated based on the past operation results. The amount can be determined.

[0023]

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) A first embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a schematic diagram showing an example of a refuse incinerator to which the method for determining a target refuse retention amount according to the first embodiment is applied.

That is, the refuse incinerator to which the method for determining the target waste accumulation amount according to the present embodiment is applied is a hopper 2
And a furnace 1 for incinerating the refuse 3, a combustion air fan 8 and a blower fan 18 for supplying combustion air to the furnace 1, and an arithmetic unit 17 for controlling operation.

The hopper 2 includes a dust feeding device 4 driven by a driving device 9.

The dust supplying device 4 supplies the waste 3 to the furnace 1, and the driving device 9 reciprocates the dust supplying device 4 in the horizontal direction. As a result, the dust supply device 4 removes the waste 3 put into the hopper 2 into the combustion grate 5 in the furnace 1.
Extrude and supply (described below).

The furnace 1 has a combustion grate 5, an ash drop 6,
Wind box 7 (7a to 7d), furnace outlet 10, chimney 11,
Heat exchanger 12, pressure gauge 14 (14a-14d), flow meter 15 (15a-15d), furnace pressure gauge 16, secondary air inlet 19, and thermometer 20 (20a-20d)
And a thermometer 21.

The combustion grate 5 is provided with a fixed portion (not shown) and a movable portion (not shown), which are alternately arranged with a certain inclination in the dust feeding direction. Then, the movable part (not shown) reciprocates to push the refuse 3 obliquely upward and forward, thereby stirring the refuse 3 on the combustion grate 5,
It is extruded to the ash fall port 6 on the downstream side in the garbage feeding direction.

Further, the combustion grate 5 is provided with a wind box 7 below. In the present embodiment, there are four wind boxes 7, and the wind boxes 7a to 7d are arranged in order from the hopper 2 side. The combustion grate 5 above the wind boxes 7 (7a to 7d) includes thermometers 20 (20a to 20d), respectively, and is connected to a combustion air fan 8 provided outside the furnace 1 respectively. The combustion air fan 8 supplies combustion air.

The thermometer 20 (20a to 20d)
The temperature of the combustion grate 5 at the upper position of each wind box 7 (7a to 7d) is measured.

On the other hand, each of the wind boxes 7 (7a to 7d) is provided with a pressure gauge 14 (14a to 14d) and a damper (not shown). Pressure gauge 14 (14a-14d)
Measures the air pressure supplied from the combustion air fan 8 to each of the wind boxes 7 (7a to 7d). A damper (not shown) adjusts the amount of combustion air supplied from the combustion air fan 8 to its own wind box 7.

Further, each wind box 7 (7a to 7d) is provided with a flow meter 15 (15a to 15d) in each supply path of combustion air from the combustion air fan 8 to each wind box 7 (7a to 7d). I have. The flow meters 15 (15a to 15d) measure the flow rates of the combustion air supplied from the combustion air fan 8 to the wind boxes 7 (7a to 7d).

The dust 3 supplied on the combustion grate 5 is blown by a combustion air fan 8 into wind boxes 7 (7a to 7d).
And is efficiently combusted by the combustion air that blows up from below the combustion grate 5 to ash. Further, the ash is pushed out to the ash drop port 6 by the movable portion of the combustion grate 5, falls through the ash drop port 6, and is discharged out of the furnace 1.

When the refuse 3 is burned on the combustion grate 5, the combustion of the refuse 3 generates exhaust gas. The exhaust gas is supplied to a furnace outlet 10 provided at the upper part of the furnace 1 and the furnace outlet 10. Is discharged outside the furnace 1 through a chimney 11 connected to the furnace.

The furnace outlet 10 includes a heat exchanger 12 including a heat transfer tube 12a and a boiler 12b, and a thermometer 21. The thermometer 21 measures the temperature of the exhaust gas at the furnace outlet 10. The cooling water flows through the heat transfer tube 12a, and the cooling water removes heat from the exhaust gas. Thereby, steam is generated in the boiler 12b.

This heat exchanger 12 is connected to a steam flow meter 13 provided outside the furnace 1,
Measures the flow rate of steam generated in the boiler 12b.

Further, the furnace 1 is provided with an in-furnace pressure gauge 16 and a secondary air inlet 19 above the combustion grate 5. Furnace pressure gauge 16 measures the internal pressure P _H of the furnace 1. The secondary air inlet 19 is connected to a blower fan 18 provided outside the furnace 1, and the blower fan 18 blows air into the furnace 1 through the secondary air inlet 19, Control combustion.

The arithmetic unit 17 calculates the steam flow rate Q _s measured by the steam flow meter 13 and the air pressure P _L (P _La ) below the combustion grate 5 measured by the pressure gauges 14 (14a to 14d).
P _{L d} ), the amount of combustion air Q (Q _a ) supplied to the combustion grate 5 measured by the flow meter 15 (15a to 15d).
Q _d ), the air pressure P _{H above} the combustion grate 5 measured by the in-furnace pressure gauge 16, the temperature T (T _{a to} T _d ) of the combustion grate 5 measured by the thermometer 20 (20 a to 20 d). ), carried out with respectively acquired measured furnace exit exhaust gas temperature T _o to a temperature gauge 21, operation of the waste holdup shown below using them, and the calculation of the target waste holdup. The arithmetic unit 17 controls the driving device 9 that drives the dust feeding device 4.

The arithmetic unit 17 calculates the amount of accumulated dust every 10 seconds, for example, as described below, using the above-described measured data.

[0042] The arithmetic unit 17, and an upper air pressure _{P H} of the combustion grate 5, which is measured by the furnace pressure gauge 16, pressure gauge 14 (14a to 14d) of the lower combustion grate 5 measured by The difference (P _L -P _H ) from the air pressure P _L (P _{La to} P _Ld ) is determined by the amount of combustion air Q passing through the wind box 7.
Divided by _(Q a ~Q _d).

This pressure difference (P _Li -P _H ) is
Corresponds to the amount of refuse accumulated on the combustion grate 5 above. For example, (P _La −P _H ) corresponds to the amount of dust accumulated on the combustion grate 5 above the wind box 7a.

However, this pressure difference (P _Li −
Since P _H ) depends on the size of the combustion air amount Q (Q _{a to} Q _d ), the pressure difference per unit flow rate of the combustion air can be obtained by dividing by the combustion air amount Q _i passing through the wind box 7. To exclude the effect of the difference in combustion air volume.

[0045] At this time, the combustion air quantity _{Q i} and the pressure difference _{(P Li}
Because the relationship between the -P _H) is non-linear, giving a exponential term n to the combustion air quantity Q _i to remove the influence. The exponent term n is a constant, and a value is used so that the amount of waste accumulated in the following equation (1) is constant regardless of the combustion air amount Q. Therefore, since the unit of the dust retention amount is determined by the value of the exponent term n, it is treated as dimensionless.

That is, the arithmetic unit 17 calculates the combustion grate 5 above the wind boxes 7 (7a to 7d) based on the following equation (1).
The amount of waste accumulated is calculated for each location i (i = a to d).

(Garbage retention amount)_i= (Pressure P in the wind box_Li-Furnace pressure P_H) / (Combustion air amount Q passing through the wind box_i) ⁿ  (1) When the pressure loss of the combustion grate 5 itself cannot be ignored.
Is the combustion air quantity Q_iAnd the pressure loss of the combustion grate 5 itself
Relationship is determined in advance, and the pressure loss value
Box pressure P_Li-Furnace pressure P_H)
Pressure difference.

Further, the arithmetic unit 17 calculates the target waste accumulation amount in each operation cycle (for example, an operation cycle of 15 minutes) using the measurement data as described above. The calculation of the target waste accumulation amount is calculated by adding a correction value calculated based on the measurement data acquired in the immediately preceding operation cycle to the target waste accumulation amount in the immediately preceding operation cycle.

FIG. 2 is a diagram showing a list of examples of calculation methods of the correction values based on the measurement data obtained in the immediately preceding operation cycle.

[0050] That is, the arithmetic unit 17, the steam flow rate mean value Q _s ave just before operation cycle from the measured data described above (e.g., operation cycle of 15 minutes)., Furnace outlet exhaust gas temperature mean T
_o ave., the average temperature T _i ave. of the combustion grate 5, and the residence time t of the exhaust gas having a temperature equal to or higher than a predetermined reference temperature in the furnace 1.
The calculated vapor flow rate mean value Q _s ave. Target steam flow rate determined in advance and Q _s tag. The correction value 1 corresponding to the ratio of the condition of FIG. 2 a
Is calculated according to the formula shown in the calculation method of Incidentally, k ₁ to k ₅ shown in the column of operation method of FIG. 2 is a positive constant.

The furnace outlet exhaust gas temperature mean T _o ave. Is, when a predetermined furnace outlet exhaust gas temperature limit reference value T _o max. Greater than the furnace outlet exhaust gas temperature mean T _o ave. And the furnace outlet exhaust gas temperature correction value 2 in accordance with the difference between the upper limit reference value T _o max.
Is calculated according to the equation shown in the calculation method of the condition b in FIG.

[0052] Furnace outlet exhaust gas temperature mean T _o ave. Is, when a predetermined furnace outlet exhaust gas temperature lower reference value T _o min. Less than the furnace outlet exhaust gas temperature mean T _o ave. And the furnace outlet exhaust gas temperature correction value 3 corresponding to a difference between the lower limit reference value T _o min.
Is calculated according to the equation shown in the calculation method of the condition c in FIG.

If the average temperature T _i ave. Of the combustion grate 5 is higher than the predetermined reference temperature T _i tag., The average temperature T _i ave. Of the combustion grate 5 and the reference temperature T _i ave. _i ta
The correction value 4 corresponding to the difference from g. is calculated according to the equation shown in the method of calculating the condition d in FIG.

If the exhaust gas residence time t at or above the predetermined reference temperature is smaller than the predetermined reference set time ttag., A correction value 5 corresponding to the difference between the exhaust gas residence time t and the reference set time ttag. Is calculated according to the equation shown in the calculation method of the condition e in FIG.

Then, the correction value 1 to the correction value 5 calculated as described above are all added to the target waste accumulation amount in the immediately preceding operation cycle to determine the target waste accumulation amount in the next operation cycle. In addition,
If you do not want twist one of the compensation values may be the appropriate constants k _n zero and (k n _{= 0).}

Next, the operation of the refuse incinerator to which the method for determining the target refuse retention amount according to the present embodiment configured as described above is applied will be described.

FIG. 3 is a flowchart showing a method of operating a waste incinerator to which the method for determining a target waste accumulation amount according to the first embodiment is applied.

The refuse 3 put into the hopper 2 is pushed out by a dust supply device 4 and supplied onto a combustion grate 5 in the furnace 1.

The refuse 3 thus supplied onto the combustion grate 5 is supplied to the wind box 7 (7a to 7a) on the combustion grate 5.
The combustion air is supplied from the combustion air fan 8 via d) and is efficiently burned to ash.

The amount of combustion air Q supplied to the combustion grate 5
Is a flow meter 15 provided for each wind box 7 (7a to 7d).
(15a to 15d), and each wind box 7 (7a
～7D) measured combustion air quantity _Q per _(Q a to Q _d) is outputted to the arithmetic unit 17.

The air pressure below the combustion grate 5 is
Each of the wind boxes 7 (7a to 7d) is measured by a pressure gauge 14 (14a to 14d) provided below the combustion grate 5 corresponding to each of the wind boxes 7 (7a to 7d). The measured pressure P _L (P _{La to} P _Ld ) is calculated by the arithmetic unit 17.
Is output to

Further, the temperature of the combustion grate 5 is set in each wind box 7.
The temperature is measured by the thermometer 20 (20a to 20d) provided on the combustion grate 5 corresponding to the position of (7a to 7d), and is measured corresponding to the position of each wind box 7 (7a to 7d). temperature _{T (T} a ~T _d) is outputted to the arithmetic unit 17.

On the other hand, the ash generated by burning the refuse 3 is pushed out to the ash drop port 6 by the movable part of the combustion grate 5,
The ash falls through the ash drop 6 and is discharged out of the furnace 1. at the same time,
Exhaust gas is generated by combustion of the refuse 3, and the pressure of the furnace 1 is increased. This pressure P _H, as well as measured by the furnace pressure gauge 16, the measurement result is output to the arithmetic unit 17.

Further, the exhaust gas exchanges heat with the cooling water flowing inside the heat transfer tube 12a provided at the furnace outlet 10 in the upper part of the furnace 1. Thereby, steam is generated in the boiler 12b. Flow rate Q _s of the vapor, while being measured by the vapor flow meter 13, it is outputted to the arithmetic unit 17. Further, the exhaust gas temperature _{T o} in the furnace outlet 10,
It is measured by the thermometer 21 and output to the arithmetic unit 17.

The exhaust gas after heat exchange with the cooling water flowing inside the heat transfer tube 12 a is discharged out of the furnace 1 through a chimney 11 connected to a furnace outlet 10.

As described above, the arithmetic unit 17 calculates the combustion air amount Q, the combustion grate lower pressure P _L , the combustion grate temperature T, the furnace pressure P _H , from the measurement values measured by the detectors as described above.
For steam flow rate Q _s, the average value in the immediately preceding operation cycle is computed (S1).

Next, a correction value as shown in FIG.
補正 correction value 5) is calculated, and the correction value is added to the target refuse accumulation amount in the immediately preceding operation cycle to calculate the target refuse accumulation amount in the next operation cycle (S2). In addition,
At this time, the calculated target waste accumulation amount is stored in the memory of the arithmetic unit 17 together with the Hu and the dust supply amount.

Further, the amount of the accumulated dust is calculated based on the above-mentioned equation (1) (S3).

The drive unit 9 is controlled by the arithmetic unit 17 based on the deviation between the target waste accumulation amount calculated in this way and the waste accumulation amount calculation value (S4). As a result, the waste supply amount is adjusted, and the waste accumulation amount follows the target waste accumulation amount (S5).

By repeatedly performing such calculation / control at intervals of, for example, 10 seconds (S6: No), the correction value of the target waste retention amount finally approaches zero (the combustion state in the furnace becomes the target value). ), The refuse incinerator will be operated in an optimal state.

After such an operation has been performed for a predetermined time (for example, 15 minutes) (S6: Yes) (S7: No), the process proceeds to the next operation cycle, and the steps after step S1 are repeated.

As described above, in the method for determining the target waste accumulation amount in the waste incinerator according to the present embodiment,
By operating the refuse incinerator,
Based on the measurements obtained, the target waste retention can be automatically adjusted to achieve the target combustion state in the furnace.

As a result, the burden on the coordinator of the waste incinerator can be reduced, and the waste incinerator can be operated in an optimal state.

(Second Embodiment) A second embodiment of the present invention will be described with reference to FIGS.

A refuse incinerator to which the method for determining a target refuse retention amount according to the second embodiment of the present invention is applied has the same configuration as the refuse incinerator shown in FIG. Only the part will be described.

That is, in the refuse incinerator to which the method for determining the target stagnation amount according to the second embodiment is applied, the arithmetic unit 17 receives a function and parameter input for calculating the target stagnation amount, and In addition, it is possible to control the operation of the refuse incinerator based on the input functions and parameters.

Next, the operation of the refuse incinerator to which the method for determining the target stagnation amount according to the present embodiment configured as described above is applied will be described.

The operation method of the waste incinerator to which the method for determining the target waste accumulation amount according to the present embodiment is applied employs the method for determining the target waste accumulation amount according to the first embodiment shown in FIG. It is the same as the operation method of the rubbish incinerator, except for the method of calculating the target waste accumulation amount shown in S5.

Therefore, only the method of calculating the target waste accumulation amount shown in S5 will be described below.

FIG. 4 is a flowchart showing a method for calculating a target waste accumulation amount in a waste incinerator to which the method for determining a target waste accumulation amount according to the second embodiment is applied.

First, based on the target waste accumulation amount, the lower heat generation amount (Hu), and the dust amount stored in the memory of the arithmetic unit 17, the target waste accumulation amount is expressed as the lower heat generation amount and the dust amount. The function is analyzed (S51).

FIG. 5 is a relationship diagram showing an example of Hu and the target waste accumulation amount when the amount of dust supplied is 105 t / day.

The horizontal axis in FIG. 5 is Hu and the unit is Kcal /
kg. The vertical axis represents the target waste accumulation amount, and the target waste accumulation amount is treated as dimensionless as described above. Therefore, the value shown on the vertical axis indicates that Hu is 2300K.
It is a relative value when the target waste retention amount in the case of cal / kg is 1.

The black portions shown in FIG. 5 are actual data, and the solid lines shown in FIG. 5 are regression lines obtained based on these actual data. In this way, the relational expression between Hu and the target garbage retention amount at various supply amounts is analyzed.
This analysis may be performed in the arithmetic unit 17 or the coordinator may take out the data stored in the memory of the arithmetic unit 17 and perform the analysis on an off-line computer.

The function and necessary parameters thus obtained are input to the arithmetic unit 17 (S5).
2). This input work may be analyzed by the arithmetic unit 17 by itself, and the result may be held as it is, or an adjuster may input the result to the arithmetic unit 17 from outside.

Based on these functions, parameters, and Hu and dust amount data in the current operation cycle, the arithmetic unit 1
In 7, the target waste accumulation amount is calculated (S53).

Thereafter, S6 shown in the flowchart of FIG.
Then, the driving device 9 is controlled based on the target waste accumulation amount, and the waste supply amount is adjusted.

As described above, the method of determining the target waste accumulation amount according to the present embodiment is the same as the method of determining the target waste accumulation amount described in the first embodiment, except that the target waste accumulation amount in the past operation cycle is The lower heat generation amount (Hu) and the amount of garbage are stored in association with each other, and the target garbage accumulation amount is calculated from the stored target garbage amount, the garbage lower heat generation amount, and the garbage collection amount in the stored past operation cycle. Low calorific value (H
This is a method for determining a target waste accumulation amount, characterized in that a function represented by u) and a dust supply amount is obtained, and the target waste accumulation amount in the next operation cycle is calculated using the function.

As described above, in the method for determining the target waste accumulation amount in the waste incinerator according to the present embodiment,
Obtain a function of Hu representing the target waste accumulation amount and the dust amount,
Calculate the target waste accumulation amount according to this function,
The operation control of the waste incinerator is performed based on the calculated target waste accumulation amount.

Therefore, even when the waste incinerator is started, the target waste retention amount can be set based on this function, the Hu of the waste to be introduced, and the amount of dust supplied. The target waste accumulation amount calculated by the function obtained in this way is
It becomes almost equal to the target waste accumulation amount judged by a skilled adjuster based on a long-time adjustment operation.

As a result, the time for adjusting and operating the waste incinerator can be shortened, and the operating rate of the waste incinerator can be increased.

Further, the burden on the coordinator of the refuse incinerator can be reduced.

[0093]

As described above, according to the method for determining a target waste retention amount in a waste incinerator according to the present invention, a target waste retention amount determined by a skilled waste incinerator coordinator over time is considered. Is obtained based on the past operation result data.

As described above, it is possible to realize a method for determining a target waste accumulation amount that can reduce the adjustment period in the operation of the waste incinerator and reduce the burden on the coordinator.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing an example of a waste incinerator to which a method for determining a target waste retention amount according to a first embodiment is applied.

FIG. 2 is a diagram showing a list of examples of a method of calculating a correction value based on measurement data obtained in a last operation cycle.

FIG. 3 is a flowchart showing a method for operating a waste incinerator to which a method for determining a target waste accumulation amount according to the first embodiment is applied.

FIG. 4 is a flowchart showing a method for calculating a target waste accumulation amount in a waste incinerator to which a method for determining a target waste accumulation amount according to the second embodiment is applied.

FIG. 5 is a relationship diagram showing an example of Hu and a target garbage retention amount when the amount of dust supplied is 105 t / day.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Furnace, 2 ... Hopper, 3 ... Garbage, 4 ... Dust supply device, 5 ... Burning grate, 6 ... Ash fall port, 7 ... Wind box, 8 ... Combustion air fan, 9 ... Drive device, 10 ... Furnace outlet , 11: chimney, 12: heat exchanger, 13: steam flow meter, 14: pressure gauge, 15: flow meter, 16: furnace pressure gauge, 17: arithmetic unit, 18: blowing fan, 19: secondary air blowing Mouth, 20, 21, ... thermometer.

Continuing on the front page (72) Inventor Manabu Kuroda 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. (72) Inventor Satoshi Fujii 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Stock Within the Company (72) Inventor Shigeyuki Doi 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Japan Pipe Co., Ltd. (72) Inventor Yasuhiro Miyakoshi 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Japan Pipe Co., Ltd. F term (reference) 3K062 AA01 AB01 AC01 BA02 BA05 CB03 CB04 CB05 CB09 DA01 DA07 DA11 DA16 DB01

Claims (6)

[Claims] 1. A method for determining a target waste retention amount in a refuse incinerator that incinerates refuse while maintaining a constant refuse retention amount on a combustion grate, wherein the target waste retention amount is determined by an exhaust gas generated by incineration of the refuse in the immediately preceding operation cycle. The average steam flow rate of the generated steam is obtained, and the target waste retention amount set in the immediately preceding operation cycle, if the average steam flow rate is greater than a predetermined target steam flow rate, the average steam flow rate value and A negative correction value set based on the target steam flow is added, and when the average steam flow is smaller than the target steam flow, a negative correction value is set based on the average steam flow and the target steam flow. A method for determining a target waste accumulation amount in a refuse incinerator, comprising calculating a target waste accumulation amount in a next operation cycle by adding a positive correction value. 2. A method for determining a target waste retention amount in a refuse incinerator that incinerates refuse while maintaining the refuse retention amount on a combustion grate, wherein the exhaust gas is discharged from the refuse incinerator in a previous operation cycle. The furnace exhaust gas temperature average value which is the temperature average value of the exhaust gas at the incinerator outlet to be obtained is obtained, and the furnace exhaust gas temperature average value is determined in advance in the target waste retention amount set in the immediately preceding operation cycle. If the outlet exhaust gas temperature upper limit reference value is greater than the furnace outlet exhaust gas temperature average value and a negative correction value set based on the furnace outlet exhaust gas temperature upper limit reference value, the furnace outlet exhaust gas temperature average value If it is smaller than a predetermined furnace outlet exhaust gas temperature lower limit reference value, a positive correction value set based on the furnace outlet exhaust gas temperature average value and the furnace outlet exhaust gas temperature lower limit reference value is added. Method of determining the target waste holdup in incinerator and calculates the target waste holdup follows operation cycle by. 3. A method for determining a target waste retention amount in a refuse incinerator that incinerates refuse while maintaining the refuse retention amount on a combustion grate, comprising: determining a temperature average value of the combustion grate in the immediately preceding operation cycle. When the average temperature of the combustion grate is larger than a predetermined combustion grate temperature reference value, the target gust retention amount set in the immediately preceding operation cycle is determined. A method for determining a target waste accumulation amount in a refuse incinerator, comprising calculating a target waste accumulation amount in a next operation cycle by adding a positive correction value set based on a combustion grate temperature reference value. 4. A method for determining a target waste retention amount in a refuse incinerator that incinerates refuse on a combustion grate while keeping the refuse retention amount constant, the exhaust gas having a temperature not lower than a predetermined reference temperature in a previous operation cycle. Obtain the exhaust gas retention time, which is the residence time in the waste incinerator, the target waste retention amount set in the immediately preceding operation cycle, if the exhaust gas retention time is smaller than a predetermined exhaust gas retention reference time Calculating a target waste retention amount in the next operation cycle by adding a positive correction value set based on the exhaust gas retention time and the exhaust gas retention reference time, the target waste retention amount in a waste incinerator. How to determine. 5. A method for determining a target waste retention amount in a refuse incinerator that incinerates refuse while maintaining the refuse retention amount on a combustion grate, comprising: a temperature average value of the combustion grate in a immediately preceding operation cycle; The average value of the steam flow rate of the steam generated by the exhaust gas generated by incineration of the refuse, the average temperature value of the exhaust gas at the furnace outlet, which is the average value of the temperature of the exhaust gas at the incinerator outlet where the exhaust gas is discharged from the refuse incinerator, And the exhaust gas retention time, which is the residence time of the exhaust gas at or above a predetermined reference temperature in the refuse incinerator, is determined, and the target steam retention amount set in the immediately preceding operation cycle, the steam flow rate average value is determined in advance. If the target steam flow rate is larger than the predetermined target steam flow rate, a first negative correction value set based on the steam flow rate average value and the target steam flow rate is added, and the steam flow rate average value is calculated. If smaller than the target steam flow rate,
Adding a first positive correction value set based on the steam flow average value and the target steam flow rate, when the furnace outlet exhaust gas temperature average value is larger than a predetermined furnace outlet exhaust gas upper limit reference value, Further adding a second negative correction value set based on the furnace outlet exhaust gas temperature average value and the furnace outlet exhaust gas upper limit reference value, wherein the furnace outlet exhaust gas temperature average value is a predetermined furnace outlet exhaust gas temperature. If smaller than the lower limit reference value, further add a second positive correction value set based on the furnace outlet exhaust gas temperature average value and the furnace outlet exhaust gas temperature lower limit reference value, the temperature average of the combustion grate If the value is larger than the predetermined combustion grate temperature reference value, a third positive correction value set based on the combustion grate temperature average value and the combustion grate temperature reference value is further added. The exhaust gas residence time If it is shorter than the predetermined exhaust gas retention reference time, the target waste retention in the next operation cycle is further added by adding a fourth positive correction value set based on the exhaust gas retention time and the exhaust gas retention reference time. A method for determining a target waste accumulation amount in a waste incinerator, wherein the amount is calculated. 6. A method for determining a target waste retention amount in a waste incinerator according to claim 5, wherein the target waste retention amount in a past operation cycle and a calorific value per unit weight of waste containing moisture are lower. Calorific value,
The amount of refuse supplied, which is the amount of refuse supplied to the refuse incinerator per unit time, is stored in association with each other, and the stored target refuse amount, the refuse lower heating value, and the refuse in the stored past operation cycle are stored. From the amount of dust
A refuse incinerator characterized by calculating a function representing the target refuse accumulation amount by the refuse lower heating value and the refuse supply amount, and using the function to calculate a target refuse retention amount for the next operation cycle. Of the target waste accumulation amount in Japan.