JPH11201435A - Waste incineration generator plant and load control method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve follow-up performance to varying power demands, by adding a precedent operation means to a combustion air quantity adjusting means and a waste charge rate adjusting means, and adding a waste charge rate delay operation means at a load variation first stage and the waste charge rate accelerating operation means at load variation second stage. SOLUTION: A precedent operation means is added to a combustion air quantity adjusting means 52 and waste charge rate adjusting means 51, and adding a waste charge rate delay operation means at a load variation first stage and the waste charge rate accelerating operation means 51 at load variation second stage. In the combustion air quantity adjusting means and waste charge rate adjusting means 52, for the precedent control of the combustion air quantity according to the change ratio of a load demand value, a target value of the combustion air quantity is computed, based on specified equations. A charge rate accelerating operation function in the waste charge rate adjusting means 51 recovers the delay of the charge rate at the load variation at first stage, and at the load variation second stage the waste is charged in precedence of the load demand value to avoid the response delay.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a load control method for a refuse incineration power plant having a refuse incinerator, a waste heat boiler for recovering thermal energy from its combustion gas and generating electricity, and a steam turbine generator. The present invention relates to a control method for improving load following characteristics in consideration of heat generation amount fluctuation characteristics when changing the amount of waste in an incinerator.

[0002]

2. Description of the Related Art Conventional control techniques relating to load control mainly aim at stabilizing the power generation output during steady load operation. That is, the main purpose is to suppress the fluctuation of the power generation output due to the fluctuation of the heat generation amount of the refuse even when the refuse input amount is constant. For example, in the first prior art (Japanese Patent Application Laid-Open No. Hei 5-313301), a part of the exhaust gas from a combustion type superheater is supplied for secondary combustion in an incinerator, and the supply amount is adjusted to stabilize the output. Is being planned. In the second prior art (Japanese Patent Laid-Open No. 6-193805), a part of the exhaust gas from the combustion type superheater is used as a heat source for preheating the primary combustion air of the incinerator. The output is stabilized by adjusting. Further, in a third prior art (Japanese Patent Laid-Open No. 6-109203), in a configuration in which a feed water heater by steam turbine bleeding and an outlet side of an accumulator are connected to a bleed pipe, opening and closing of a bleed valve in response to excess or deficiency of generated steam. The output is stabilized by closing and opening the accumulator outlet valve. In addition, the fourth prior art (Japanese Patent Laid-Open No. 7-260)
No. 105) controls the steam temperature by adjusting the amount of fuel to the combustion type superheater, and secures the necessary amount of steam by adjusting the amount of spray to the superheating steam.

[0003] However, in the above prior art,
When the load demand value is changed, when the amount of waste input is greatly increased or decreased, rapid and stable load following operation is difficult due to the large reverse response and response delay of the heat generation of the waste as described below. Met.

[0004]

When the load fluctuates, the control requires
The following two points are problematic.

(1) When the amount of waste is increased to cope with an increase in the load, the amount of water brought by the waste increases, and thus energy consumption as heat of evaporation increases until ignition occurs. Therefore, the amount of heat contributing to the generation of steam temporarily decreases, and the power generation output shows a reverse response. Further, the amount of heat generated after the ignition of the refuse increases, but the power generation output shows a large response delay.

(2) When the amount of waste is reduced in order to cope with a load drop, it takes time to reduce the amount of heat generated by the combustion of the already-entered waste, and a large response delay occurs in reducing the power output. .

[0007] Therefore, an object of the present invention is to solve the above-mentioned problem that makes rapid and stable load following operation difficult by control technology.

[0008]

According to the present invention, in order to solve the above-mentioned problems, the means for adjusting the amount of combustion air and the means for adjusting the amount of waste are devised as follows.

First, in order to suppress the reverse response when the load rises, a preceding operation means is added to the combustion air amount adjusting means,
As the waste input adjustment means, a waste input delay operation means for the initial stage of load change and a waste input acceleration operation unit for the latter stage of the load change are added. Further, in order to improve the response at the time of the load drop, a preceding operation means is added to the combustion air amount adjusting means and the dust input amount adjusting means.

[0010] In the combustion air amount adjusting means, the advance operation means increases the air amount prior to the load increase, thereby activating the combustion of the already-injected waste in advance, thereby delaying the response when the amount of introduced waste is increased. Acts to suppress the
Further, the waste input delay operation means in the waste input adjusting means also acts to suppress the reverse response because the waste input is increased after the activated combustion of the waste is activated. In addition, the refuse input acceleration means in the refuse input adjusting means recovers the delay of the refuse input amount at the initial stage of the load fluctuation, and prevents a response delay by inputting refuse in advance in the latter stage of the load increase. Act like so.

On the other hand, when the load drops, the air amount is reduced prior to the load drop by the preceding operation means in the combustion air amount adjusting means, so that the combustion of the already-injected refuse is inactivated in advance, thereby reducing the load drop. Acts to increase responsiveness. Also, in the dust input amount adjusting means, the dust input amount advance operation means reduces the dust input amount in advance, thereby acting to increase the responsiveness of the load drop.

As described above, according to the present invention, the input amounts of the dust and the combustion air are appropriately adjusted in consideration of the combustion characteristics of the dust, so that the rapid and stable response to a large load change request is achieved. Load follow-up control becomes possible.

Embodiments of the present invention include the following.

(1) In a refuse incineration power plant that recovers thermal energy from a refuse incinerator and its combustion gas in a waste heat boiler and guides generated steam to a steam turbine to generate power, each corresponds to a load change request signal. It has a refuse input adjustment means and a combustion air quantity adjustment means that operate, and the combustion air quantity adjustment means has a preceding operation function in response to a load increase, and the refuse input quantity adjustment means has refuse input for the initial stage of load fluctuation. Waste incineration power generation characterized by adding an amount delay operation means and an acceleration operation means for the latter stage of load fluctuation, and adding a preceding operation means to the combustion air amount adjustment means and the waste input amount adjustment means in response to a load drop. Plant load control method.

(2) In a refuse incinerator and a waste incineration power plant that recovers thermal energy from the combustion gas of the refuse by a waste heat boiler and guides the generated steam to a steam turbine to generate power, each corresponds to a load change request signal. A load control unit for a refuse incineration power plant, comprising: a refuse input amount adjusting unit that operates; a combustion air amount adjusting unit; and a preceding operation unit is added to the combustion air amount adjusting unit in response to a load increase. Method.

(3) In a refuse incineration power plant that recovers thermal energy from a refuse incinerator and its combustion gas in a waste heat boiler and guides generated steam to a steam turbine to generate power, each corresponds to a load change request signal. Activated refuse input amount adjusting means and combustion air amount adjusting means, and in response to an increase in load, a preceding operation means is added to the combustion air amount adjusting means, and refuse input amount adjusting means is provided with a delay operation means. A load control method for a refuse incineration power plant, wherein acceleration control means is added.

(4) In a refuse incineration power plant that recovers thermal energy from a refuse incinerator and its combustion gas by a waste heat boiler and guides generated steam to a steam turbine to generate power, each corresponds to a load change request signal. Activated refuse input amount adjusting means and combustion air amount adjusting means, and in response to an increase in load, a preceding operation means is added to the combustion air amount adjusting means, and refuse input amount adjusting means is provided with a delay operation means. A load control method for a refuse incineration power plant, wherein acceleration operation means is added, and preceding operation means is added to the waste input adjustment means in response to a load drop.

(5) In the load control method for a refuse incineration power plant according to any one of (1) to (4), constants used in the refuse input amount adjusting means and the combustion air amount adjusting means may be set in advance from outside. Load control method that can be set to

(6) In the load control method for a refuse incineration power plant according to any one of (1) to (4), a constant used by the refuse input amount adjusting means and the combustion air amount adjusting means is loaded by the means. A load control method which appropriately calculates and decides in consideration of a change rate, a load change width, a load level, and the like.

(7) A refuse incinerator and a refuse incineration power plant that recovers thermal energy from the combustion gas in a waste heat boiler and guides the generated steam to a steam turbine to generate power correspond to the load change request signal. It has a refuse input adjustment means and a combustion air quantity adjustment means that operate, and the combustion air quantity adjustment means has a preceding operation function in response to a load increase, and the refuse input quantity adjustment means has refuse input for the initial stage of load fluctuation. A delay operation means and an acceleration operation means for the latter stage of the load change are added, and a preceding operation means is added to the combustion air amount adjustment means and the refuse input amount adjustment means in response to a load drop, and the various operations are executed. Waste incineration characterized by predicting a value ahead of the current time, that is, a future value, correcting the various operations in accordance with the predicted value, and actually operating the corrected value. Power plant load control method.

(8) In a plant comprising a plurality of units, a waste incineration power generation facility for recovering thermal energy from a waste incinerator and its combustion gas by a waste heat boiler and guiding generated steam to a steam turbine to generate power is defined as one unit. And a combustion air amount adjusting means that operates in response to the load change request signal, and a combustion air amount adjusting means that operates in response to a load increase. The adjusting means is provided with a waste input delay operation means for the initial stage of load change and an acceleration operating means for the latter stage of load change, and the preceding operation means is provided for the combustion air amount adjusting means and the waste input adjusting means in response to the load drop. A load control method for a refuse incineration power plant, which is added.

(9) Combustion-type refuse incineration in which thermal energy is recovered from a refuse incinerator and its combustion gas by a waste heat boiler, the generated steam is heated by a combustion heater, and then guided to a steam turbine for power generation. The power plant has a waste input amount adjusting means and a combustion air amount adjusting means which respectively operate in response to the load change request signal, and the combustion air amount adjusting means has a preceding operation function in response to a load increase. In addition to the waste input adjustment means, a waste input delay operation means for the initial stage of load fluctuation and an acceleration operation means for the latter stage of load fluctuation are added.
A load control method for a refuse incineration power plant, wherein prior operation means is added to the combustion air amount adjusting means and the refuse input amount adjusting means in response to a load drop.

(10) Thermal energy is recovered from a refuse incinerator and its combustion gas by a waste heat boiler, and the generated steam is guided to a steam turbine to generate power. Also, a gas turbine power generation facility and its waste heat recovery boiler are combined. In the combined waste incineration power plant, the waste incineration power adjustment unit and the combustion air amount adjustment unit that operate in response to the load change request signal are respectively provided. Is a precedence operation function, a waste input adjustment means is provided with a waste input delay operation means for the initial stage of load change and an acceleration operation means for the latter stage of load change, and the combustion air amount adjustment unit and the waste input amount are provided in response to a load drop. A load control method for a refuse incineration power plant, wherein a preceding operation means is added to the adjustment means.

(11) Thermal energy is recovered from the refuse incinerator and its combustion gas by a waste heat boiler, the generated steam is led to a steam turbine, and steam is temporarily extracted from the middle stage of the steam turbine. In a boiler reheat-type incineration power plant that reheats and introduces power to the subsequent stage of the steam turbine again to generate power, a waste input amount adjusting means that operates in response to a load change request signal, and a combustion air amount. Adjustment means, corresponding to the load rise, the combustion air amount adjustment means has a preceding operation function, and the waste input adjustment means has a waste input delay operation means for the initial stage of load fluctuation and an acceleration operation means for the latter stage of the load fluctuation. A load control method for a refuse incineration power plant, wherein a preceding operation means is added to the combustion air amount adjusting means and the refuse input amount adjusting means in response to a load drop. .

(12) Thermal energy is recovered from the refuse incinerator and its combustion gas by a waste heat boiler, the generated steam is led to a steam turbine, and steam is once extracted from the middle stage of the steam turbine, and the extracted steam is separated. In the externally independent reheating type waste incineration power plant that reheats with the heated heater and introduces it again to the subsequent stage of the steam turbine to generate power, the waste input adjusting means that operates in response to the load change request signal, It has an air amount adjusting means, and the combustion air amount adjusting means has a preceding operation function in response to a load rise, and the waste input adjusting means has a waste input delay operation means for an initial load change and an acceleration operation for a late load change. A waste incineration power plant load characterized by adding means for controlling the amount of air for combustion and the means for adjusting the amount of waste input in response to a load drop. Your way.

(13) Thermal energy is recovered from the refuse incinerator and its combustion gas by a waste heat boiler, the generated steam is led to a steam turbine, and steam is once extracted from the middle stage of the steam turbine. In the moisture separation and reheating type waste incineration power plant, which guides the separated steam to reheat the separated steam and introduces it again to the subsequent stage of the steam turbine to generate power, adjusts the amount of waste to be operated in response to the load change request signal Means for controlling the amount of combustion air, wherein the means for adjusting the amount of combustion air corresponds to a load increase, and the means for adjusting the amount of waste input means the means for delaying the amount of waste input with respect to the initial stage of load fluctuation. A waste incineration power plant characterized by adding acceleration operation means for the later period of fluctuation and adding advance operation means to the combustion air amount adjustment means and the waste input amount adjustment means in response to a load drop. Cement load control method.

(14) Thermal energy is recovered from the refuse incinerator and its combustion gas by a waste heat boiler, the generated steam is guided to a steam turbine, a part of the steam is extracted from the middle stage of the steam turbine, and power is generated. In a feed water heating type waste incineration power plant that uses the extracted steam for heating the boiler feed water, the waste water incineration power plant has a waste input amount adjusting unit and a combustion air amount adjusting unit that are operated in response to a load change request signal, and the load increases. To cope with the situation, a preceding operation function is added to the combustion air amount adjustment means, and a waste input amount delay operation means for the initial stage of load fluctuations and an acceleration operation means for the latter stage of the load fluctuations are added to the waste input adjustment means to cope with the load drop. A load control method for a refuse incineration power plant, wherein a preceding operation means is added to the combustion air amount adjusting means and the refuse input amount adjusting means.

[0028]

FIG. 1 shows the overall configuration of a refuse power generation plant 100 according to an embodiment of the present invention and input / output signals of a load control device 200. In this plant, the refuse introduced into the stoker-type incinerator 1 by the pusher 2 is burned by the combustion air 4 sent by the blower 3, and the heat energy of the high-temperature combustion gas is generated by the waste heat boiler 5. The power is supplied to a load (not shown) as a power generation output 8 by a steam turbine 6 driven by the generated steam and a generator 7 connected thereto. Exhaust gas 9 after driving the steam turbine 6 is condensed by a condenser 10 to be deaerated 11
And sent to the economizer 13 of the waste heat boiler 5 by the water supply pump 12. The feed water heated by the economizer 13 evaporates in the evaporator 15 via the drum 14 and is further superheated in the superheater 16 to become superheated steam 17. The superheated steam 17 is sent to an accumulator 18 and then further heated to a main steam 20 by a combustion type superheater 19. A part of the superheated steam 17 is sent to the deaerator 11 via the accumulator 18 and is used as the degassing steam 21.

As an input signal to the load control device 200, a target load L set by the load demand value setting unit 22 is set.
_STR2 , times t ₁ and t ₂ set by the load change period setting units 23a and 23b, the actual load L _STA detected by the wattmeter 33, the superheated steam temperature T _SH detected by the steam temperature detectors 24 and 25, and the main steam. The temperature T _MS , the main steam pressure P _MS detected by the pressure detector 26, and the waste heat boiler drum level X _DL detected by the drum level detector 27 are included.

Output signals for load control include a pusher operation cycle F _P for controlling the amount of waste input,
Blower rotation speed N _AF for controlling the amount of combustion air, opening A _SP of spray flow control valve 29 for controlling superheated steam temperature by desuperheater 28, rotation speed N _BFP of feed water pump for controlling feed water flow. , The opening A _CV for the steam turbine control valve 30 for controlling the steam amount flowing into the steam turbine, and the opening A _HF for the fuel amount adjusting valve 31 for the combustion type superheater 19.

FIG. 2 shows the combustion characteristics of refuse, which is a direct factor that makes load control difficult. When the load rises, as shown in FIG. 1A, increasing the amount of waste increases the amount of water brought by the waste, so that energy consumption as heat of evaporation increases until the introduced waste is ignited.
Therefore, an inverse response is exhibited in which the amount of heat contributing to the generation of steam temporarily decreases. As a result, the power generation output also makes a reverse response. Further, the amount of generated heat gradually increases after the ignition of dust, but it takes time to reach a steady state, and the power generation output shows a large response delay.

On the other hand, when the load is reduced, as shown in FIG. 2B, when the amount of waste is reduced, it takes a long time to reduce the calorific value because the remaining waste already injected continues to burn.
A large response delay is exhibited until a steady state is reached. Therefore, the response of the power generation output to a steady state is further delayed.

FIG. 3 is a functional block diagram of a load control device 200 according to an embodiment of the present invention. In the present invention, a new control means indicated by a thick line is added to a conventional load control means conventionally used as indicated by a thin line in FIG.

First, the conventional control means will be described. The conventional control means comprises six control loops which operate in response to the instantaneous load request value L _STR (t). That is, the refuse input amount control loop 211, the combustion air amount control loop 212, the superheated steam temperature control loop 213, and the main steam temperature control loop 2
14, a main steam pressure control loop 215, and a feedwater flow rate control loop 216. Control loops 211, 212, 213,
_{Reference numerals 214} , ₂₁₅ , and _{216 denote} a target waste input amount G _GFR0 , a target combustion air amount G _AFR0 , a target superheated steam temperature T _SHR , and a target main steam temperature T _{MSR which} are required according to the instantaneous load request value L _STR (t). , Target main steam pressure P _MSRX , target drum level X
_DLR is converted to function generators 41, 42, 43, 44, 45, 46.
It is calculated by: However, target main steam pressure P _MSRX above the actual target value with the value P _MSR obtained by subtracting the correction value [Delta] P _MSR calculated by the correction function 50 in accordance with the load deviation [Delta] L _STR. The target values T _SHR , T _MSR , P _MSR , X _DLR
, The detected values T _SH , T _MS , P _MS , X
_DL is fed back, and each deviation ΔT _SH , ΔT _MS ,
ΔP _MS and ΔX _DL are converted to proportional-integral type adjusters 53, 54, 55,
And outputs the output results as the respective target manipulated _variables G _SPR , G _HFR , A _CVR , and G BFPR.
By setting 4, 65, 66, the spray flow control valve opening A _SP , the combustion type superheater fuel amount control valve opening A _HF , the steam turbine control valve opening A _CV , and the feedwater pump rotation speed _NBFP are determined. The operation is performed so as to match the target operation amount. Further, the target waste input amount G _GFR0 (= G _GFR ) in the waste input amount control loop 211 and the combustion air amount control loop 212
In regard to the target combustion air amount G _AFR0 (= G _AFR), is controlled by pusher operating cycle F _P and the blower rotation speed N _AF corresponding thereto is determined by the operation means 61 and 62.

With respect to the conventional load control means described above,
In the present invention, in order to solve the above-mentioned problem, an instantaneous target load demand value generating means 210, a refuse input amount adjusting means 51, and a combustion air amount adjusting means 52 are provided as new control means indicated by a thick line in FIG. . Further, as means accompanying these, a load request value setting unit 22 for setting the next target load L _STR2 and a load change period setting unit 23a for setting the start time t ₁ and the end time t ₂ of the load change. , 23b, function generators 47, 48, 49, and a constant setting unit 57
a, 57b, 58, 59a, and 59b. However, the function generators 47 and 48 are the same as the function generator 41 in the conventional means.
The function generator 49 is the same as the function generator 42 in the conventional means.

Hereinafter, these means will be specifically described step by step.

The instantaneous target load demand value generating means 210 _{calculates the} next set target load L _STR2 and the load change start time t.
_{Based on 1} and the end time t ₂ , a ramp-shaped instantaneous target load request value L _STR (t) is generated according to the following equation.

[0038]

L _STR1 = L _STR (t) (t <t ₁ ) (1)

[0039]

(Equation 2)

In the above equation, L _STR1 means a target load request value at the start of a load change.

Next, in the combustion air amount adjusting means 52, in order to control the combustion air amount in advance in accordance with the rate of change of the required load value L _STR (t), the target value of the combustion air amount is calculated according to the following equation. Calculate the value _GAFR .

[0042]

(Equation 3)

In the above equation, G _AFR0 and G _AFR2 are based on the load demand values L _STR (t) and L _STR2 , respectively.
It is a value uniquely determined from 49. Also, K _AU and K _AD
Is the rate of change of the load request value L _STR (t) (dL _STR (t) / d
It is a constant for determining the bias amount for pre-operating the combustion air amount in proportion to t), and both have positive values. Therefore, it acts as a positive bias when the load rises (when the load change rate is positive) and acts as a negative bias when the load drops (when the load change rate is negative).

Next, in the refuse input amount adjusting means 51,
When the load increases, the target waste input amount G _GFR is determined according to the following equation.

[0045]

(Equation 4)

In the above equation, G _GFR1 and G _GFR2 are function generators 47 and 48 based on the load demand values L _STR1 and L _STR2.
Is a value uniquely determined from. Δt ₁ is a delay time for delaying the increase start time of the waste input amount,
t ₂ is an acceleration time for advancing the increase completion time of the waste input amount. That is, the increase start time of the garbage input is (t ₁ +
Δt ₁ ), and the increase completion time is (t ₁ −Δt ₂ ).
Also, at the time of load drop, the target waste input amount _GGFR is determined according to the following equation.

[0047]

(Equation 5)

In the above equation, G _AFR0 is the load demand value L
_This is a value uniquely determined by the function generator 41 based on _STR (t). K _GD is the rate of change of the required load value L _STR (t)
It is a constant for determining a bias amount for precedingly operating the combustion air amount in proportion to (dL _STR (t) / dt).
Has a positive value. Therefore, when the load drops (when the load change rate is negative), it acts as a negative bias.

FIG. 4 shows the effect of the load control characteristics according to the embodiment of the present invention. When the target load changes in the form of a ramp, in the conventional method, as shown by the broken line, both the waste input amount G _GFR0 and the combustion air amount G _AFR0 are simply changed in the form of a ramp in accordance with the load request value. The actual load L _SRA generates a reverse response and a large response delay when the load increases for the reason described above, and a large response delay also occurs when the load decreases. In contrast, according to the present invention,
The preceding operation works on the combustion air amount G _AFR both when the load increases and when the load decreases, and the preceding operation works on the waste input amount G _GFR when the load decreases. Further, a delay operation is performed on the waste input amount G _GFR at the initial stage when the load is increased, and thereafter, an acceleration operation is performed. As a result of these operations, the actual load L _SRA quickly and stably follows the load change request value L _SRR .

That is, in the combustion air amount adjusting means 52, the response delay is suppressed by activating the combustion of the already-injected waste in advance by increasing the air amount prior to the load increase by the advance operation function. Is acting like. Furthermore, the waste input delay operation function of the waste input adjusting means 51 also acts to suppress the reverse response caused by the evaporative heat consumption in order to increase the waste input after waiting for the activation of the combustion of the already input waste. I have. In addition, the garbage charge acceleration operation function of the garbage charge adjustment means recovers the delay of the garbage charge in the initial stage of the load fluctuation, and in the latter half of the load increase, the refuse is charged earlier than the load request value. It works to prevent a response delay. On the other hand, at the time of load drop, by reducing the air amount prior to the load drop by the preceding operation function of the combustion air amount adjusting means 52, the combustion of the already-injected refuse is inactivated in advance, so that the response of the load drop is reduced. Is acting to raise. Also, the refuse input amount adjusting means 51 acts to increase the responsiveness of the load drop by reducing the refuse input amount ahead of the load request value by the preceding operation function.

As described above, according to the present invention, the input amounts of the dust and the combustion air are appropriately adjusted based on the combustion characteristics of the dust, so that rapid and stable load following control can be performed even for a large load change request. Becomes possible.

In the above embodiment of the present invention, preceding operation means is added to the combustion air amount adjusting means 52 and the dust input amount adjusting means 51, and the waste input amount adjusting means 51 is further provided with a delay operating means and an acceleration operating means. The case where all of these functions were added is also shown. However, it is not always necessary to add all means as in the embodiment in a refuse incineration power plant in which the load fluctuation is relatively slow. For example, a satisfactory load following characteristic may be obtained only by adding the preceding operation means in response to the load increase of the combustion air amount adjusting means 52. If this is not sufficient, a satisfactory load following characteristic may be obtained by adding delay operation means and acceleration operation means to the refuse input amount adjusting means 51. If the load response delay at the time of the load drop becomes a problem, a satisfactory load following characteristic may be obtained by loading the waste operation amount adjusting means 51 with the preceding operation means. In this way, various means for improving the load following ability of the present invention may be combined and applied as needed.

In the above embodiment of the present invention, the constants t ₁ , t ₂ , k _GD , k _AU , and k _AD set in the constant setting units 57 a, 57 b, 58, 59 a, 59 b are used as the combustion air amount adjusting means 52. Alternatively, it is set from the outside of the refuse input amount adjusting means 51, but it is not always necessary to use such a method, and the calculation is appropriately determined in consideration of the load change rate, the load change width, the load level, and the like inside each of them. As a matter of course, the present invention can be applied without changing the essence.

In the above embodiment of the present invention, the case where a plant having a combustion type superheater is controlled is described. However, the present invention can be applied to a plant having no combustion type superheater as described below. For example, there are a plant of a type in which steam generated from a waste heat boiler is directly guided to a steam turbine via an accumulator, and a combined plant of gas turbine power generation equipment and its waste heat recovery boiler. Furthermore, steam is once extracted from the middle stage of the steam turbine, guided to a waste heat boiler and reheated, and then introduced again to the latter stage of the steam turbine. An external independent reheating plant that heats, a moisture separation reheating plant that guides the extracted steam to the moisture separator and reheats the separated steam, or a regeneration cycle plant that uses the extracted steam for heating the boiler feed water Also in the above, the present invention can be applied as it is to control in a refuse incinerator.

In the above-described embodiment of the present invention, the preceding operation and the delay operation are described as a method of uniquely determining the preceding operation and the delay operation based on the load request value and a preset constant, and executing the operation. Even if a method in which a value before the current time, that is, a future value is predicted in advance, and the operation is corrected according to the predicted value, a better load following ability can be realized without changing the essence of the present invention. It is.

In the above embodiment of the present invention, the case of a plant comprising one unit of power generation equipment has been described. However, when the amount of waste in the plant is large, the plant is often operated by a plurality of units. However, it goes without saying that the present invention can be applied without loss of generality.

[0057]

The first effect of the present invention is that when the input amount of refuse as fuel in an incinerator is changed in response to a load change request, the reverse response of the power generation output caused by a complicated change in the calorific value. It is possible to supply high-quality power with rapid and stable followability to fluctuating power demand.

Further, the second effect of the present invention is that, since fluctuations in the calorific value in the incinerator and unnecessary fluctuations in the heat input to the steam turbine can be suppressed, the incinerator, the waste heat boiler and the steam turbine can be used. It is to be able to suppress the life consumption of the plant component equipment.

[Brief description of the drawings]

FIG. 1 is a diagram showing an overall configuration of a refuse power generation plant according to an embodiment of the present invention and input / output signals of load control means.

FIG. 2 is a diagram showing the combustion characteristics of refuse, which is a factor that makes load control difficult.

FIG. 3 is a functional block diagram of a load control device according to an embodiment of the present invention.

FIG. 4 is a diagram showing the effect of load control characteristics according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Incinerator, 4 ... Combustion air, 5 ... Waste heat boiler, 6 ... Steam turbine, 7 ... Generator, 51 ... Waste input amount adjusting means,
52: combustion air amount adjusting means, 200: load control device,
210: Instantaneous target load request value generation means.

Claims (7)

[Claims] A waste incinerator, a waste heat boiler for recovering thermal energy from the combustion gas, a steam turbine driven by steam generated in the waste heat boiler, and a control signal in response to a load change request signal. A waste incineration power plant having a load control device for outputting the waste air in the load control device, the load control device comprising waste input amount adjusting means and combustion air amount adjusting means operating in response to a load change request signal; A pre-operation function for pre-operating the amount of combustion air in response to a load change is added to the adjusting means, and the refuse input adjusting means is provided with a function for delaying the refuse input operation at the initial stage of load increase and a refuse input operation thereafter. A refuse incineration power plant characterized by adding a function of accelerating and a function of precedingly controlling a refuse input amount in response to a load drop. 2. A waste incinerator, a waste heat boiler for recovering thermal energy from the combustion gas, a steam turbine driven by steam generated by the waste heat boiler, and a control signal in response to a load change request signal. A waste incineration power plant having a load control device for outputting the waste air in the load control device, the load control device comprising waste input amount adjusting means and combustion air amount adjusting means operating in response to a load change request signal; A refuse incineration power plant, characterized in that a pre-operation function for pre-operating the amount of combustion air in response to a load increase is added to the adjusting means. 3. A waste incinerator, a waste heat boiler for recovering thermal energy from the combustion gas, a steam turbine driven by steam generated by the waste heat boiler, and a control signal in response to a load change request signal. A waste incineration power plant having a load control device for outputting the waste air in the load control device, the load control device comprising waste input amount adjusting means and combustion air amount adjusting means operating in response to a load change request signal; A pre-operation function of pre-operating the amount of combustion air in response to a load increase is added to the adjusting means, and the waste input amount adjusting means is provided with a function of delaying the operation of the initial input of the load and an operation of inputting the waste thereafter. A refuse incineration power plant characterized by the addition of an accelerating function. 4. A waste incinerator, a waste heat boiler for recovering thermal energy from the combustion gas, a steam turbine driven by steam generated by the waste heat boiler, and a control signal in response to a load change request signal. A waste incineration power plant having a load control device for outputting the waste air in the load control device, the load control device comprising waste input amount adjusting means and combustion air amount adjusting means operating in response to a load change request signal; A pre-operation function of pre-operating the amount of combustion air in response to a load increase is added to the adjusting means, and the waste input amount adjusting means is provided with a function of delaying the operation of the initial input of the load and an operation of inputting the waste thereafter. A refuse incineration power plant characterized by adding a function of accelerating and a function of precedingly controlling a refuse input amount in response to a load drop. 5. A load control method for a refuse incineration power plant for recovering thermal energy contained in combustion gas of a refuse incinerator by a waste heat boiler and guiding generated steam to a steam turbine for power generation. A load control method for a refuse incineration power plant, wherein the amount of combustion air is preliminarily operated in response to the above. 6. A load control method for a refuse incineration power plant that recovers thermal energy contained in combustion gas of a refuse incinerator by a waste heat boiler and guides generated steam to a steam turbine to generate power. A load control method for a refuse incineration power plant, wherein the amount of air is changed in advance and the change in the amount of refuse is started later than the load rising time. 7. A load control method for a refuse incineration power plant for recovering thermal energy contained in a combustion gas of a refuse incinerator by a waste heat boiler and guiding generated steam to a steam turbine for power generation. A load control method for a refuse incineration power plant, wherein the amount of air is increased first and the amount of combustion air and the amount of waste are reduced first when the load decreases.