JP5656754B2 - Power generation facility for waste incinerator and control method thereof - Google Patents

Description

  The present invention relates to a control system and a control method for a power generation facility for a waste incinerator, and more particularly to a power generation facility for a waste incinerator for effectively using surplus steam and a control method therefor.

  Conventionally, power generation facilities for waste incinerators that generate power using waste heat from waste incinerators are composed of the same equipment as general thermal power plants, and perform Rankine cycle using steam as the working fluid. As shown in Fig. 3, as the main equipment, boiler 1 and superheater 2 generate steam with high pressure and temperature by absorbing the combustion heat of waste generated in an incinerator (not shown), and convert the energy of steam into power A steam turbine 3 that generates electric power by being driven by the steam turbine 3, and a low-pressure steam condenser 5 that returns low-pressure steam that has finished work in the steam turbine 3 back to water. Furthermore, the power generation equipment for the refuse incinerator includes, as ancillary equipment, steam extracted from the boiler feed pump 6, deaerator 7, deaerator feed water pump 8, steam air preheater 9, condensate tank 10, and steam turbine 3. It includes a deaerator 7 that uses heat, a residual heat utilization facility 11 such as a hot water supply facility and a heating facility, an economizer 12, a high-pressure steam reservoir 13, a low-pressure steam reservoir 14, and the like.

  In the power generation equipment attached to the waste incinerator, it is generally necessary to install power generation equipment corresponding to high-quality waste from low-quality waste.

  Therefore, for example, if the steam turbine 3 is designed for high-quality waste with the largest amount of generated steam and all steam generated from low-quality waste to high-quality waste is swallowed by the steam turbine, the frequency of occurrence is highest throughout the year. When incineration of standard waste that is assumed to be high is incinerated, the steam turbine has a low load operation, and there is a problem that power generation output and power generation efficiency decrease.

  Therefore, as shown in FIG. 4, when the steam turbine 3 is designed with reference waste or slightly higher waste quality than the reference waste, and excess steam is generated, the low-pressure steam condenser 5 passes through the bypass line 15. A power generation facility for a waste incinerator configured to condensate the entire amount has been proposed. However, in this case, there is a problem that the energy of the surplus steam is released to the atmosphere and cannot be used effectively.

  Therefore, as shown in FIG. 5 and FIG. 6, when the amount of steam in the high-pressure steam supply line 16 that supplies steam to the steam turbine 3 exceeds the maximum swallowing amount of the steam turbine 3, part or all of the surplus steam. Waste incineration for the purpose of increasing the output of the generator 4 by reducing the amount of steam extracted from the steam turbine 3 by effectively using the heat in the heat utilization facilities such as the deaerator 7 and the surplus heat utilization facility 11 A power generation facility for a furnace has been proposed (Patent Document 1, etc.).

In the waste incinerator power generation facility of FIG. 5, when surplus steam is generated, the extraction steam control valve Vd is closed, the surplus steam heat utilization control valve Va is opened, and steam is sent to the low pressure steam reservoir 14 through the surplus steam heat utilization line 17. The surplus steam sent to the low-pressure steam reservoir 14 is effectively used in heat utilization equipment such as the residual heat utilization equipment 11 and the deaerator 7. When there is surplus steam that can be used in the heat utilization equipment, the turbine bypass control valve Vb ₁ is opened, and surplus steam that is used in the heat utilization equipment is passed through the turbine bypass line 18 in the low-pressure steam condenser 5. Condensate. The amount of extracted steam from the extraction line 19 can be reduced by the amount of surplus steam used in the heat utilization facility, the output of the generator 4 can be increased, and the maximum possible power generation amount can be obtained in some cases.

In the waste incinerator power generation facility of FIG. 6, when surplus steam is generated, the extraction steam control valve is closed, the surplus steam heat utilization control valves Va and Vf are opened, and the low-pressure steam reservoir through the turbine bypass line 20 a and the surplus steam heat utilization line 21. Send steam to 14. The surplus steam sent to the low-pressure steam reservoir 14 is effectively used in heat utilization equipment such as the residual heat utilization equipment 11 and the deaerator 7. When there is surplus steam that can be used in the heat utilization equipment, the turbine bypass control valve Vb ₂ is opened, and surplus steam that is used in the heat utilization equipment is released to the low-pressure steam condenser 5 through the turbine bypass line 20b. And condensate. The amount of extracted steam from the extraction line 19 can be reduced by the amount of surplus steam used in the heat utilization facility, the output of the steam turbine generator 4 can be increased, and the maximum possible power generation amount can be obtained in some cases. it can.

JP 2006-284018 A

  The power generation facility for the refuse incinerator shown in FIG. 5 can obtain the maximum possible power generation amount depending on the case, but may not obtain the maximum possible power generation amount, and the power generation efficiency is not always good.

In addition, the operation with the steam turbine 3 in operation is possible. However, when the steam turbine trips and the amount of turbine bypass steam suddenly increases, the surplus steam heat utilization control valve Va is opened rapidly to surplus steam. A large amount of turbine bypass steam is sent to the low-pressure steam reservoir 14 through the heat utilization line 17, and then the large amount of steam flowing into the low-pressure steam reservoir 14 by suddenly opening the turbine bypass control valve Vb ₁ is transmitted through the turbine bypass line 18. Send to water container 5. In this case, since the flow characteristics and operation characteristics of the surplus steam heat utilization control valve Va and the turbine bypass control valve Vb ₁ are different, the pressure in the low-pressure steam reservoir 14 between the valves fluctuates. When the pressure in the low-pressure steam reservoir 14 fluctuates, the pressure of the equipment installed in the subsequent stage of the low-pressure steam reservoir 14 also fluctuates, and there is a risk that safety valves (not shown) will operate in various places and the deaerator pressure will fluctuate. is there.

Even the power generation facility for the refuse incinerator shown in FIG. 6 can obtain the maximum possible power generation amount in some cases, but the maximum possible power generation amount may not be obtained, and the power generation efficiency is not always good. In addition, the operation in a state where the steam turbine 3 is operating is possible, but when the turbine trips, the surplus steam heat utilization control valve Va and the turbine bypass control valve Vb ₂ are opened rapidly and through the turbine bypass lines 20a and 20b. A large amount of turbine bypass steam is sent to the low-pressure steam condenser 5. In this case, since the flow characteristics and operation characteristics of the surplus steam heat utilization control valve Va and the turbine bypass control valve Vb ₂ are different, the pressure in the piping between the two valves varies, and the inlet pressure of the surplus steam heat utilization control valve Vf varies. To do. When the inlet pressure of the surplus steam heat utilization control valve Vf varies, the pressure of the low pressure steam reservoir 14 at the rear stage of the surplus steam heat utilization control valve Vf also varies. When the pressure in the low-pressure steam reservoir 14 fluctuates, the pressure of the equipment installed in the subsequent stage of the low-pressure steam reservoir 14 also fluctuates, and there is a risk that safety valves (not shown) will operate in various places and the deaerator pressure will fluctuate. is there.

  Therefore, the present invention provides the maximum power generation amount while effectively utilizing the surplus steam for heat utilization equipment such as residual heat utilization equipment and deaerator heating when the amount of steam supplied to the steam turbine exceeds the maximum swallowing amount of the steam turbine. The present invention provides a power generation facility for a waste incinerator and a control method thereof that can improve the energy efficiency of the entire power generation facility and avoid a dangerous state such as operating a safety valve even when a turbine trip occurs. The main purpose.

  In order to achieve the above object, a power generation facility for a waste incinerator according to the present invention generates a boiler using waste heat from a waste incinerator, a steam turbine driven by high-pressure steam from the boiler, and power generated by the steam turbine. A generator, a condenser for condensing the low-pressure steam that has passed through the steam turbine, a low-pressure steam reservoir connected to be able to supply a part of the high-pressure steam and the extracted steam of the steam turbine, and the low-pressure steam reservoir A heat utilization facility that uses the heat of the steam, a turbine bypass line that bypasses the steam turbine and supplies the high-pressure steam from the boiler to the condenser, and a steam amount control device, The surplus steam heat utilization line for connecting a part of the high-pressure steam to the low-pressure steam reservoir so as to be able to be supplied and the turbine bypass line are separate systems, and the steam amount control device, When the pressure of the high-pressure steam supplied to the steam turbine exceeds a predetermined value, the pressure of the high-pressure steam supplied to the steam turbine is released to the predetermined value by escaping a part of the high-pressure steam to the low-pressure steam reservoir. While controlling the extraction amount of the extraction steam so that the power generation amount of the generator approaches the maximum value, and the pressure in the low-pressure steam reservoir fluctuates due to the fluctuation of the extraction amount accompanying the control of the extraction amount The amount of high-pressure steam released to the low-pressure steam reservoir is controlled so that the pressure in the low-pressure steam reservoir is maintained within a predetermined pressure range, and the pressure of the high-pressure steam supplied to the steam turbine is greater than the predetermined value. When the high predetermined upper limit is exceeded, the turbine bypass line is opened, and the pressure of the high-pressure steam supplied from the boiler to the steam turbine is equal to or lower than the upper limit set value. And controlling the amount of steam of the turbine bypass line as.

  In order to achieve the above object, a method for controlling a power generation facility for a waste incinerator according to the present invention includes a boiler that uses waste heat of a waste incinerator, a steam turbine that is driven by high-pressure steam from the boiler, A generator for generating electricity by a steam turbine; a condenser for condensing the low-pressure steam that has passed through the steam turbine; and a low-pressure steam reservoir connected to be able to supply a part of the high-pressure steam and the extracted steam of the steam turbine; A heat utilization facility that utilizes the heat of the steam in the low-pressure steam reservoir, and a turbine bypass line that connects the high-pressure steam from the boiler so as to bypass the steam turbine and be supplied to the condenser, A method for controlling a waste incinerator facility in which a surplus steam heat utilization line for connecting a part of high-pressure steam to the low-pressure steam reservoir and the turbine bypass line are separate systems When the pressure of the high-pressure steam supplied to the steam turbine exceeds a predetermined value, the pressure of the high-pressure steam supplied to the steam turbine is reduced by releasing a part of the high-pressure steam to the low-pressure steam reservoir. While maintaining the predetermined value, the extraction amount of the extraction steam is controlled so that the power generation amount of the generator approaches the maximum value, and when the pressure in the low-pressure steam reservoir fluctuates due to the fluctuation of the extraction amount, the low pressure Controlling the amount of high-pressure steam released to the low-pressure steam reservoir so as to keep the pressure in the steam reservoir within a predetermined pressure range, and a predetermined upper limit value in which the pressure of the high-pressure steam supplied to the steam turbine is higher than the predetermined value The turbine bypass line is opened, and the pressure of the high-pressure steam supplied from the boiler to the steam turbine is set to be equal to or lower than the upper limit set value. And controlling the amount of steam bottle bypass line.

  According to the present invention, when the pressure supplied to the steam turbine exceeds a predetermined value because the high-pressure steam supplied to the steam turbine exceeds the maximum swallowing amount of the steam turbine, By adjusting the extraction amount, the generation amount of the steam turbine generator is increased by reducing or eliminating the extraction steam amount of the steam turbine and flowing the steam to the exhaust side of the steam turbine, and a part of the generated surplus steam Alternatively, the entire steam is supplied to the heat utilization equipment via the low-pressure steam reservoir, so that the surplus steam can be used effectively and the energy efficiency of the entire power generation equipment can be improved. Since high-pressure steam is released through a separate turbine bypass line, the safety valve of the surplus steam utilization line is activated. It is possible to avoid a dangerous situation.

  Conventionally, the maximum swallowed steam amount of a steam turbine is considered to be a waste quality (for example 10 % Increase) was often set as the turbine design waste quality, but according to the present invention, even if surplus steam is generated, the power generation amount of the generator by the steam turbine can be increased. It is possible to design the amount of steam with the standard waste, and as a result, the steam turbine can be designed more compactly than before, and the power generation efficiency with the standard waste can be improved.

It is a system diagram showing one embodiment of the power generation equipment for a refuse incinerator according to the present invention. It is a control flowchart of the power generation equipment for refuse incinerators of FIG. It is a system diagram which shows one form of the conventional power generation equipment for refuse incinerators. It is a system diagram which shows the other form of the conventional power generation equipment for refuse incinerators. It is a system diagram which shows the further another form of the conventional power generation equipment for refuse incinerators. It is a system diagram which shows the further another form of the conventional power generation equipment for refuse incinerators.

  A power generation facility for a waste incinerator and a control method thereof according to the present invention will be described below with reference to FIGS. 1 and 2. In addition, the same code | symbol was attached | subjected to the same component through the said prior art example.

  As shown in FIG. 1, a power generation facility for a waste incinerator includes a boiler 1 that uses waste heat from an outside incinerator, a steam turbine 3 that is connected to the boiler 1 through a high-pressure steam supply line 16, and a steam turbine 3. The generator 4 that generates power, the power generation detector G that detects the power generation amount of the generator 4, the condenser 5 that is connected to the steam turbine 3 by the condensate line 22, and the high-pressure steam supply line 16 are interposed. High pressure steam reservoir 13, low pressure steam reservoir 14 connected to high pressure steam reservoir 13 and surplus steam heat utilization line 17, deaerator 7 connected to low pressure steam reservoir 14, residual heat utilization facilities such as hot water supply facilities and heating facilities 11, a turbine bypass line 15 that connects the high-pressure steam supply line 16 and the condensate lie 22, and an extraction line 19 that extracts the steam from the steam turbine 3 and supplies the extracted steam to the low-pressure steam reservoir 14. The surplus steam heat utilization control valve Va interposed in the surplus steam heat utilization line 17, the turbine bypass control valve Vb interposed in the turbine bypass line 15, the extraction steam control valve Vd interposed in the extraction line 19, and the high pressure steam A first pressure detector PA for detecting the vapor pressure in the supply line 16, a second pressure detector PB for detecting the vapor pressure in the low-pressure steam reservoir 14, a first pressure detector PA, a second pressure detector PB, and A steam amount control device 23 that receives a detection signal from the power generation amount detector G and controls the surplus steam heat utilization control valve Va, the turbine bypass control valve Vb, the extraction steam control valve Vd, and the like. The surplus steam heat utilization line 17 and the turbine bypass line 15 are separated from the high-pressure steam reservoir 13 by a steam supply system.

  A turbine inlet shut-off valve Ve is usually provided near the turbine inlet of the high-pressure steam supply line 16. The turbine inlet shut-off valve Ve can be used in response to a command from the central control room (not shown) or the on-site control panel where the steam turbine is installed in the event of an abnormality in the rotational speed, shaft vibration, bearing portion, etc. of the steam turbine. Shut off the inflow of steam to the turbine and stop the steam turbine rapidly. Note that shutting off the inflow of steam to the steam turbine and rapidly stopping the steam turbine is referred to as a turbine trip.

  The surplus steam heat utilization control valve Va, the turbine bypass control valve Vb, and the extraction steam control valve Vd are control valves capable of adjusting the opening, for example, proportional control valves.

  The control procedure by the steam amount control device 23 will be described below with reference to the control flowchart of FIG.

  At the start, that is, in the initial state where the steam turbine 3 is stopped, the surplus steam heat utilization control valve Va and the turbine bypass control valve Vb are open, and the turbine inlet shut-off valve Ve and the extraction steam control valve Vd are closed. Yes.

  As shown in FIG. 2A, the steam amount control device 23 determines whether or not the detected pressure (Pa) of the first pressure detector PA is equal to or higher than the steam turbine operable lower limit set pressure (P0) (step). S1). Here, P0 is, for example, 3.6 MPa.

  When the steam pressure control device 23 determines in step S1 that the detected pressure (Pa) of the first pressure detector PA is smaller than the steam turbine operable lower limit set pressure (P0) (that is, Pa <P0), Maintain state. In the initial state, based on the detected pressure (Pb) of the second pressure detector PB so that the steam pressure in the low-pressure steam reservoir 14 becomes a predetermined value (P2) set in relation to the low-pressure steam reservoir 14. Then, the surplus steam heat utilization control valve Va is controlled. This predetermined value (P2) is, for example, the rated pressure of the low-pressure steam reservoir 14, and is, for example, 0.5 MPa.

  When the steam pressure control device 23 determines that the detected pressure (Pa) of the first pressure detector PA is equal to or higher than the steam turbine operable lower limit set pressure (P0) (ie, Pa ≧ P0) in step S1, the detected pressure ( It is determined whether Pa) is less than a predetermined value (P1) set in relation to the steam turbine (step S2). The predetermined value (P1) is, for example, a turbine rated pressure, and is, for example, 3.7 MPa.

  When it is determined in step S2 that the detected pressure (Pa) of the first pressure detector PA is less than the predetermined value (P1) (ie, Pa <P1), the steam amount control device 23 performs control in the normal operation mode (step S3). ).

  In the normal operation mode, as a basic operation, the surplus steam heat use control valve Va and the turbine bypass control valve Vb are closed, and the turbine inlet cutoff valve Ve is opened. Further, the extraction steam control valve Vd is controlled based on the detected pressure (Pb) of the second pressure detector PB so that the steam pressure (Pb) in the low-pressure steam reservoir 14 becomes a predetermined value (P2).

  When the steam amount of the high-pressure steam increases and the steam amount control device 23 determines in step S2 that the detected pressure (Pa) of the first pressure detector PA is equal to or higher than a predetermined value (P1) (ie, Pa ≧ P1), the steam amount The control device 23 switches the operation mode from the normal operation mode to the surplus steam utilization operation mode (step S4).

  In the surplus steam utilization operation mode, while ensuring the maximum swallowed steam amount of the steam turbine 3, the amount of extraction is reduced to the point where the power generation amount becomes maximum, and surplus steam is supplied to the heat utilization equipment via the surplus steam heat utilization line. Control to do.

  Note that the amount of steam supplied to the steam turbine 3 can be derived from the detected pressure (Pa) of the first pressure detector PA, and the maximum swallowed steam amount of the steam turbine is the steam corresponding to the rated pressure of the steam turbine. Amount. Therefore, in the surplus steam utilization operation mode, the extraction pressure (Pa) of the first pressure detector PA is ensured to be equal to or higher than the rated pressure of the steam turbine 3, and the amount of extraction is reduced, and the surplus steam heat utilization control valve Va is controlled. The opening degree is increased and surplus steam is supplied to the low-pressure steam reservoir 14.

  In the surplus steam utilization operation mode, the initial state is temporarily set. The initial state of the surplus steam utilization operation mode is the same as the normal operation mode, that is, the surplus steam heat utilization control valve Va and the turbine bypass control valve Vb are closed, the turbine inlet shut-off valve Ve is opened, and the steam in the low pressure steam reservoir 14 is opened. This is a state in which the opening degree of the extraction steam control valve Vd is controlled so that the pressure (Pb) becomes a predetermined value (P2).

In the surplus steam utilization operation mode, the steam amount control device 23 first decreases the degree of opening of the extraction steam control valve Vd by a predetermined amount to adjust the extraction steam amount so as to maximize the power generation amount (step S5). ). As a result, it is determined whether the power generation amount of the power generation amount detector G has increased (step S6). If the power generation amount has increased, the opening degree of the extraction steam control valve Vd is further decreased by a predetermined degree. This operation is performed until the power generation amount does not increase (that is, the power generation amount becomes maximum).
When the power generation amount detected by the power generation amount detector G is reduced as a result of reducing the opening degree of the extraction steam control valve Vd in step S5, the opening degree of the extraction steam control valve Vd is increased by a predetermined degree (step S7). ). As a result, it is determined whether or not the surplus steam heat utilization control valve Va is fully closed (step S8). If the surplus steam heat utilization control valve Va is not fully closed, the power generation amount detected by the power generation amount detector G is detected. (Step S9), if the amount of power generation has increased, the process returns to step S7 to further increase the opening degree of the extraction steam control valve Vd by a predetermined degree, and the amount of power generation has not increased Returns to step S5 and decreases the opening degree of the extraction steam control valve Vd.

  By adjusting the opening degree of the extraction steam control valve Vd as described above, control is performed so as to search for a point where the power generation amount becomes maximum.

In steps S5 and S7, the pressure in the low-pressure steam reservoir 14 is increased or decreased by increasing or decreasing the opening degree of the extraction steam control valve Vd, but the steam amount control device 23 adjusts the opening degree of the surplus steam heat utilization control valve Va. By doing so, the detected pressure (Pb) of the low-pressure steam reservoir 14 is controlled to be the set value P2.
Specifically, in step S5, when the steam supplied to the low-pressure steam reservoir is reduced by restricting the extraction steam and the pressure (Pb) in the low-pressure steam reservoir 14 becomes equal to or lower than the set value (P2), the surplus steam The opening degree of the heat utilization control valve Va is increased. In step S7, when the amount of extracted steam increases and the pressure (Pb) in the low-pressure steam reservoir 14 exceeds the set value (P2), the opening degree of the surplus steam heat utilization control valve Va is decreased.

  If it is determined in step S8 that the surplus steam heat utilization control valve Va is fully closed in step S8 because the opening degree of the surplus steam heat utilization control valve Va is reduced, that is, if the surplus steam amount becomes zero, again. Returning to the start point, the normal operation mode (step S3) or the surplus steam using operation mode (step S4) is entered through steps S1 and S2.

  In the normal operation mode (step S3), the pressure (Pb) of the low-pressure steam reservoir 14 is controlled to be the set value P2 by adjusting the opening degree of the extraction steam control valve Vd, and the surplus steam heat utilization control valve Va is Although it is basically fully closed, when the steam turbine 3 is in partial load operation and the extraction steam pressure supplied from the extraction line 19 decreases, the pressure (Pb) in the low-pressure steam reservoir 14 even if the extraction steam control valve Vd is fully opened. May become lower than the set value P2, in this case, the steam pressure of the low pressure steam reservoir 14 is increased by increasing the opening of the surplus steam heat utilization control valve Va and supplying steam to the low pressure steam reservoir 14. Control is made to return to the set value P2.

  As shown in FIG. 2 (b), the steam amount control device 23 sets a set value P3 (as a predetermined upper limit value) in which the turbine inlet pressure (Pa) is higher than the set value (P1) that is a start condition of the surplus steam utilization operation mode. For example, it is determined whether the pressure is less than or equal to 3.8 MPa (step S10). When the set value P3 as the predetermined upper limit value is exceeded, the opening of the turbine bypass control valve Vb is increased (step S11), and when the set value P3 becomes lower than the set value P3. The opening degree of the turbine bypass control valve Vb is decreased so as not to exceed the set value P3 (step S12).

  During the turbine trip, the turbine inlet shut-off valve Ve is shut off. The turbine inlet pressure (Pa) rises rapidly due to the sudden closing of the turbine inlet shut-off valve Ve and exceeds the set value (P3), so the steam control device 23 opens the turbine bypass control valve Vb rapidly (step S12), and the turbine The bypass steam is released to the condenser 5 through the bypass line 15. Since the turbine bypass line 15 does not pass through the low-pressure steam reservoir 14, even if the high-pressure steam escapes to the condenser 5 through the turbine bypass line 15, a safety valve for equipment installed at the subsequent stage of the low-pressure steam reservoir 14. (Not shown) is not operated, and fluctuations in the deaerator pressure can be suppressed.

1 Boiler 3 Steam Turbine 5 Condenser 13 High Pressure Steam Reservoir 14 Low Pressure Steam Reservoir 15 Turbine Bypass Line 23 Steam Volume Control Device

Claims (2)

A boiler that uses waste heat from a waste incinerator, a steam turbine that is driven by high-pressure steam from the boiler, a generator that generates electricity using the steam turbine, and a condenser that condenses the low-pressure steam that has passed through the steam turbine A low-pressure steam reservoir connected to be able to supply a part of the high-pressure steam and the extraction steam of the steam turbine, heat utilization equipment that uses heat of the steam of the low-pressure steam reservoir, and high-pressure steam from the boiler A surplus steam that includes a turbine bypass line that bypasses the steam turbine and is connected to the condenser so that the steam can be supplied, and a steam amount control device, and that connects a part of the high pressure steam to the low pressure steam reservoir The heat utilization line and the turbine bypass line are separate systems,
The steam amount control device includes:
When the pressure of the high-pressure steam supplied to the steam turbine exceeds a predetermined value, the pressure of the high-pressure steam supplied to the steam turbine is released to the predetermined value by escaping a part of the high-pressure steam to the low-pressure steam reservoir. While controlling the extraction amount of the extraction steam so that the power generation amount of the generator approaches the maximum value, and the pressure in the low-pressure steam reservoir fluctuates due to the fluctuation of the extraction amount accompanying the control of the extraction amount Controlling the amount of high-pressure steam released to the low-pressure steam reservoir so as to maintain the pressure in the low-pressure steam reservoir within a predetermined pressure range when
When the pressure of the high-pressure steam supplied to the steam turbine exceeds a predetermined upper limit value higher than the predetermined value, the turbine bypass line is opened, and the pressure of the high-pressure steam supplied from the boiler to the steam turbine is the upper limit. A power generation facility for a waste incinerator, wherein the amount of steam in the turbine bypass line is controlled to be equal to or less than a set value. A boiler that uses waste heat from a waste incinerator, a steam turbine that is driven by high-pressure steam from the boiler, a generator that generates power using the steam turbine, and a condenser that condenses the low-pressure steam that has passed through the steam turbine A low-pressure steam reservoir connected to be able to supply a part of the high-pressure steam and the extraction steam of the steam turbine, heat utilization equipment that uses heat of the steam of the low-pressure steam reservoir, and high-pressure steam from the boiler A turbine bypass line that bypasses the steam turbine and is connected to the condenser so that the steam can be supplied, and a surplus steam heat utilization line that connects a part of the high-pressure steam to the low-pressure steam reservoir so that the turbine can be supplied. A method for controlling a waste incinerator facility in which the bypass line is a separate system,
When the pressure of the high-pressure steam supplied to the steam turbine exceeds a predetermined value, the pressure of the high-pressure steam supplied to the steam turbine is set to the predetermined value by escaping a part of the high-pressure steam to the low-pressure steam reservoir. While holding, control the extraction amount of the extraction steam so that the power generation amount of the generator approaches the maximum value, and when the pressure in the low-pressure steam reservoir fluctuates due to the fluctuation of the extraction amount, Controlling the amount of steam of the high-pressure steam released to the low-pressure steam reservoir so as to keep the pressure within a predetermined pressure range;
When the pressure of the high-pressure steam supplied to the steam turbine exceeds a predetermined upper limit value higher than the predetermined value, the turbine bypass line is opened, and the pressure of the high-pressure steam supplied from the boiler to the steam turbine is the upper limit. A method for controlling a power generation facility for a refuse incinerator, wherein the amount of steam in the turbine bypass line is controlled to be equal to or less than a set value.

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