JP2013002392A - Power generation equipment for refuse incinerator and control method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide power generation equipment for a refuse incinerator and the control method of the equipment for effectively using surplus steam for heat-utilizing equipment so as to improve overall energy efficiency of the power generation equipment, and ensure safety even when a turbine trip occurs.SOLUTION: The power generation equipment is controlled in such a manner that, when the pressure of high-pressure steam supplied to a steam turbine exceeds a predetermined value, part of the high-pressure steam is released to a low-pressure steam reservoir to maintain the pressure of the high-pressure steam supplied to the steam turbine at the predetermined value, and the extraction amount of extracted steam is regulated to keep the inner pressure of the low-pressure steam reservoir within a predetermined pressure range. When the amount of high-pressure steam to be released to the low-pressure steam reservoir exceeds a steam amount that can hold the inner pressure of the low-pressure steam reservoir within the predetermined pressure range by the restricting the extraction amount, the high-pressure steam is released to a condenser through a turbine bypass line so as to hold the inner pressure of the low-pressure steam reservoir within the predetermined pressure range.

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 by the heat utilization facility, and the output of the generator 4 can be increased.

In the waste incinerator power generation facility of FIG. 6, when surplus steam is generated, the extraction steam control valve Vd is closed, the surplus steam heat utilization control valves Va and Vf are opened, and the low pressure steam is transmitted through the turbine bypass line 20 a and the surplus steam heat utilization line 21. Steam is sent to the reservoir 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, and the output of the steam turbine generator 4 can be increased.

JP 2006-284018 A

The power generation facility for the waste incinerator shown in FIG. 5 can be operated in a state where the steam turbine 3 is operating. However, if the steam turbine trips and the amount of steam in the turbine bypass increases rapidly, excess steam heat is generated. The utilization control valve Va is rapidly opened to send a large amount of turbine bypass steam to the low-pressure steam reservoir 14 through the surplus steam heat utilization line 17, and then the turbine bypass control valve Vb ₁ is suddenly opened to flow into the low-pressure steam reservoir 14. Are sent to the low-pressure steam condenser 5 through the turbine bypass line 18.

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.

The power generation facility for the waste incinerator shown in FIG. 6 can be operated in a state where the steam turbine 3 is operating, but when the turbine trips, the surplus steam heat utilization control valve Va and the turbine bypass control valve Vb ₂ are suddenly turned on. It opens and a large amount of turbine bypass steam is sent to the low pressure steam condenser 5 through the turbine bypass lines 20a and 20b. 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 effectively utilizes 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 main purpose is to provide a power generation facility for a waste incinerator and a control method thereof that can avoid a dangerous pressure state that activates a safety valve even when a turbine trip occurs while improving the energy efficiency of To do.

  In order to achieve the above object, a power generation facility for a waste incinerator according to the present invention generates a boiler that uses waste heat of a waste incinerator, a steam turbine that is driven by high-pressure steam from the boiler, and generates power using 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 utilizes the heat of the steam, a high-pressure steam from the boiler that bypasses the steam turbine and is connected to the condenser so that it can be supplied to the condenser, and a steam amount control device. The surplus steam heat utilization line that connects part of the high-pressure steam to the low-pressure steam reservoir so that it can 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 maintained at the predetermined value by allowing a part of the high-pressure steam to escape to the low-pressure steam reservoir. However, the extraction amount of the extraction steam is controlled so as to keep the inside of the low-pressure steam reservoir within a predetermined pressure range, and the amount of the high-pressure steam released to the low-pressure steam reservoir is controlled by the restriction of the extraction amount. When the pressure in the steam reservoir exceeds the amount of steam that can be maintained in the predetermined pressure range, the high pressure steam is condensed through the turbine bypass line so that the low pressure steam reservoir is maintained in the predetermined pressure range. It is controlled to escape to the vessel.

  In order to achieve the above object, the present invention provides 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 electric power using the steam turbine, and the steam Utilizing a condenser for condensing the low-pressure steam that has passed through the 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, and the heat of the steam in the low-pressure steam reservoir A high-pressure steam from the boiler, and a turbine bypass line connected to be able to supply the condenser with the high-pressure steam bypassing the steam turbine, and a part of the high-pressure steam is stored in the low-pressure steam reservoir. A surplus steam heat utilization line connected to be able to be supplied to the turbine and the turbine bypass line are a separate system for controlling a power generation facility for a refuse incinerator, which is used for the steam turbine. When the pressure of the high-pressure steam to be discharged exceeds a predetermined value, the extracted steam is maintained while maintaining the pressure of the high-pressure steam supplied to the steam turbine at the predetermined value by allowing a part of the high-pressure steam to escape to the low-pressure steam reservoir. The amount of high-pressure steam released to the low-pressure steam reservoir is controlled by the restriction of the amount of extraction, so that the pressure in the low-pressure steam reservoir is controlled to keep the inside of the low-pressure steam reservoir within a predetermined pressure range. When the amount of steam that can be maintained within the predetermined pressure range is exceeded, control is performed so that high-pressure steam is released to the condenser through the turbine bypass line so that the low-pressure steam reservoir is maintained within the predetermined pressure range. It is characterized by doing.

  According to the present invention, when the pressure supplied to the steam turbine exceeds a predetermined value due to the high-pressure steam supplied to the steam turbine exceeding the maximum swallowing amount of the steam turbine, the extraction amount of the steam turbine is limited. The amount of steam generated by the steam turbine is increased by reducing or eliminating the amount of steam extracted from the steam turbine and flowing the steam toward the exhaust side of the steam turbine to increase the power generation amount of the generator driven by the steam turbine. Steam is supplied to the heat utilization equipment such as a deaerator through the low-pressure steam reservoir while maintaining the vapor pressure of the low-pressure steam reservoir within a predetermined range by letting it escape to the low-pressure steam reservoir. The overall energy efficiency can be improved, and when the turbine trips, etc., the turbine bypass line separate from the surplus steam heat utilization line is used. Since releasing the high pressure steam through, it is possible to avoid dangerous pressure conditions such as to actuate the safety valve of excess steam heat utilization line.

  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 by a high-pressure steam supply line 16, and a steam turbine 3. Generator 4 for generating electricity, condenser 5 connected to steam turbine 3 and condensate line 22, high-pressure steam reservoir 13 interposed in high-pressure steam supply line 16, high-pressure steam reservoir 13 and surplus steam heat utilization line 17, a low-pressure steam reservoir 14 connected at 17, a heat utilization facility such as a deaerator 7 connected to the low-pressure steam reservoir 14, a residual heat utilization facility 11 such as a hot water supply facility and a heating facility, a high-pressure steam supply line 16 and a condensate. A turbine bypass line 15 connecting the lie 22, an extraction line 19 for extracting the extracted steam from the steam turbine 3 and supplying the extracted steam to the low-pressure steam reservoir 14, and surplus interposed in the surplus steam heat utilization line 17 An air heat utilization control valve Va, a turbine bypass control valve Vb interposed in the turbine bypass line 15, an extraction steam control valve Vd interposed in the extraction line 19, and a first pressure for detecting the steam pressure in the high-pressure steam supply line 16. The detection signal is received from the pressure detector PA, the second pressure detector PB for detecting the vapor pressure of the low-pressure steam reservoir 14, the first pressure detector PA and the second pressure detector PB, and the surplus steam heat utilization control valve Va is received. A steam amount control device 23 for controlling 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.

  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).

  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), Based on the detected pressure (Pb) of the second pressure detector PB so that the steam pressure in the low-pressure steam reservoir 14 is maintained at a predetermined value (P2) set in relation to the low-pressure steam reservoir 14. The surplus steam heat utilization control valve Va is controlled. This predetermined value (P2) is, for example, the operating 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, the surplus steam heat utilization 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 greater than a predetermined value (P1) (that is, Pa ≧ P1), the steam The quantity control device 23 switches to the surplus steam utilization operation mode (step S4).

  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, surplus steam is utilized in the heat utilization facility, so that the surplus steam heat utilization control valve Va is opened from the initial state, and surplus steam exceeding the maximum swallowing amount of the steam turbine 3 is surplus steam heat utilization line. 17 to the low pressure steam reservoir 14.

  In the surplus steam utilization operation mode, first, it is determined whether or not the detected pressure (Pb) in the low pressure steam reservoir 14 by the second pressure detector PB is equal to or less than a predetermined value (P2) (step S5).

  When the detected pressure (Pb) in the low pressure steam reservoir 14 by the second pressure detector PB is determined to be equal to or less than the predetermined value (P2) in step S5, by adjusting the opening degree of the surplus steam heat utilization control valve Va, The surplus steam heat utilization control valve Va is controlled so that the detected pressure (Pa) of the first pressure detector PA becomes a predetermined value (P1), surplus steam is sent to the low pressure steam reservoir 14 through the surplus steam heat utilization line 17, While the pressure of the steam supplied to the steam turbine 3 is kept at a predetermined value (P1), the pressure in the low-pressure steam reservoir 14 is determined based on the detected pressure (Pb) of the second pressure detector PB. The extraction steam control valve Vd is controlled so as to be a predetermined value (P2) by increasing the opening degree of (step S6).

  If it is determined in step S5 that the detected pressure (Pb) in the low pressure steam reservoir 14 by the second pressure detector PB is greater than the predetermined value (P2) of the low pressure steam reservoir 14 (ie, Pb> P2), the second pressure is further increased. It is determined whether or not the detected pressure (Pb) by the detector PB is equal to or lower than an upper limit set value (P3 (for example, 0.6 MPa)) set as an upper limit of the low-pressure steam reservoir 14 (step S7). The upper limit set value (P3) is set to a level at which the safety valve of the device installed at the subsequent stage of the low pressure steam reservoir 14 is not operated.

  If it is determined in step S7 that the detected pressure (Pb) by the second pressure detector PB is equal to or lower than the upper limit set value (P3) of the low-pressure steam reservoir 14 (ie, Pb ≦ P3), the opening degree of the extraction steam control valve Vd is decreased. Based on the detected pressure (Pa) of the first pressure detector PA by adjusting the opening of the surplus steam heat utilization control valve Va while lowering the pressure of the low-pressure steam reservoir 14 to approach the predetermined value (P2). Control is performed to maintain the pressure supplied to the steam turbine at a predetermined value (P1) (step S8).

  When the amount of steam passing through the surplus steam heat utilization line 17 increases and the detected pressure (Pb) of the low-pressure steam reservoir 14 exceeds the upper limit set value (P3) even when the extraction steam control valve Vd is fully closed, in step S7 When it is determined that the detected pressure (Pb) by the second pressure detector PB is larger than the upper limit set value (P3) of the low-pressure steam reservoir 14, the opening degree of the excess steam heat utilization control valve Va is decreased, and the low-pressure steam reservoir 14 The detected pressure (Pb) is controlled so as not to exceed the upper limit set value (P3) (step S9).

  In the normal operation mode (step S3), the pressure (Pb) of the low-pressure steam reservoir 14 is controlled to be a predetermined 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 predetermined 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 predetermined value P2.

  It is determined whether or not the pressure (Pa) of the high-pressure steam supply line 16 is equal to or lower than the upper limit set value (P4) of the steam turbine 3 by reducing the opening degree of the surplus steam heat utilization control valve Va in step S9 (step S9). S10).

  If it is determined in step S10 that the detected pressure (Pa) of the first pressure detector PA exceeds the upper limit set value (P4), the opening of the turbine bypass control valve Vb is increased (step S11), and the high pressure When the pressure of the steam supply line 16 is decreased and the detected pressure (Pa) of the first pressure detector PA is determined to be equal to or lower than the upper limit set value (P4), the turbine bypass is set so as not to exceed the upper limit set value (P4). The opening degree of the control valve Vb is decreased (step S12) so that as much high-pressure steam as possible is supplied to the steam turbine 3.

  Since the turbine inlet shutoff valve Ve at the steam turbine inlet is shut off during the turbine trip, the detected pressure (Pa) of the first pressure detector PA rises rapidly and exceeds the upper limit set value (P4). In that case, the turbine bypass control valve Vb is rapidly opened, and the high-pressure steam is released to the low-pressure steam condenser 5 through the turbine 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 connecting a part of the high-pressure steam to the low-pressure steam reservoir so as to be able to supply the turbine bypass line connected to the condenser by bypassing the steam turbine; The steam heat utilization line 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 steam amount control device allows a part of the high-pressure steam to escape to the low-pressure steam reservoir so that the high-pressure steam supplied to the steam turbine While maintaining the pressure at the predetermined value, the amount of extracted steam is controlled so as to hold the inside of the low-pressure steam reservoir within a predetermined pressure range, and the amount of steam of the high-pressure steam released to the low-pressure steam reservoir is When the pressure in the low-pressure steam reservoir exceeds the amount of steam that can be maintained within the predetermined pressure range due to the restriction of the amount of extraction, the turbine bypass line is configured to maintain the low-pressure steam reservoir within the predetermined pressure range. A power generation facility for a waste incinerator, wherein high pressure steam is controlled to escape through the condenser. 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 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 the part of the high-pressure steam to the low-pressure steam reservoir so that it can be supplied. A method for controlling a power generation facility for a refuse incinerator, wherein the turbine 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 maintained at the predetermined value by allowing a part of the high-pressure steam to escape to the low-pressure steam reservoir. However, the extraction amount of the extraction steam is controlled so as to keep the inside of the low-pressure steam reservoir within a predetermined pressure range, and the amount of the high-pressure steam released to the low-pressure steam reservoir is controlled by the restriction of the extraction amount. When the pressure in the steam reservoir exceeds the amount of steam that can be maintained in the predetermined pressure range, the high pressure steam is condensed through the turbine bypass line so that the low pressure steam reservoir is maintained in the predetermined pressure range. The control method is characterized in that control is performed so as to escape.

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