WO2019053803A1 - Auxiliary power generation system and thermal power plant - Google Patents

Auxiliary power generation system and thermal power plant Download PDF

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Publication number
WO2019053803A1
WO2019053803A1 PCT/JP2017/033027 JP2017033027W WO2019053803A1 WO 2019053803 A1 WO2019053803 A1 WO 2019053803A1 JP 2017033027 W JP2017033027 W JP 2017033027W WO 2019053803 A1 WO2019053803 A1 WO 2019053803A1
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WO
WIPO (PCT)
Prior art keywords
power generation
steam
line
supply line
heat
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PCT/JP2017/033027
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French (fr)
Japanese (ja)
Inventor
博昭 谷川
泰孝 和田
福見　拓也
宏 蓮池
Original Assignee
中国電力株式会社
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Application filed by 中国電力株式会社 filed Critical 中国電力株式会社
Priority to JP2018500946A priority Critical patent/JP6354923B1/en
Priority to PCT/JP2017/033027 priority patent/WO2019053803A1/en
Publication of WO2019053803A1 publication Critical patent/WO2019053803A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
    • F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
    • F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
    • F01K23/10—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle with exhaust fluid of one cycle heating the fluid in another cycle

Definitions

  • the present invention relates to a power generation assistance system and a thermal power plant.
  • a power generation facility that generates steam by burning fossil fuel in a boiler and supplies overheated steam to a steam turbine to generate power.
  • a power generation facility if the temperature of water supplied to the boiler can be increased, the power generation efficiency is improved. Therefore, it is practiced to preheat water supplied to the boiler with the extracted steam extracted from the steam turbine.
  • a steam turbine plant has been proposed in which a heat source (for example, another boiler) derived from renewable energy is separately provided and the water supplied to the boiler is preheated using this heat source (for example, see Patent Document 1) .
  • auxiliary equipment equipment for generating heat from renewable energy
  • the operating rate utilization factor of the auxiliary equipment
  • the utilization factor of the auxiliary facility is lowered, and the economic evaluation of the auxiliary facility is lowered.
  • the power generating equipment may be stopped for a long time (for example, half a year), and the auxiliary equipment is also stopped for a long time.
  • the evaluation of the economics of the auxiliary equipment is greatly reduced. Therefore, it is important on the installation to increase the utilization factor of the auxiliary equipment.
  • An object of the present invention is to provide a power generation assistance system and a thermal power plant capable of improving the capacity factor.
  • the present invention is a power generation assistance system that is disposed in a thermal power plant having a plurality of power generation facilities that supply steam from a boiler that generates fossil fuel by burning fossil fuel to generate steam to generate power, and assists the power generation by the power generation facility.
  • a bypass line connected to each of the plurality of water supply lines connected from the turbines of the power generation equipment to the boiler, and bypassing the water supply line, and a steam generation unit generating steam using heat derived from renewable energy
  • a heat exchanger for preheating water flowing therethrough.
  • the bypass line is disposed across a plurality of the power generation facilities, and is provided for one heat exchange line passing through the heat exchanger and for each of the plurality of power generation facilities, and the upstream side of the heat exchange lines
  • a plurality of bypass lines are provided for each of the plurality of power generation facilities, and a plurality of heat exchangers are provided for each of the bypass lines.
  • a plurality of the heat exchangers are provided, and one heat exchange line is disposed across the plurality of the heat exchangers.
  • the auxiliary power generation system further includes a flow control valve for controlling supply of steam from the heat exchange steam supply line to the heat exchanger, and the heat exchange steam supply line includes a plurality of heat exchangers. It is preferable to provide a main steam supply line disposed across and a secondary steam supply line connecting the main steam supply line and the heat exchanger. Further, the control of the supply of steam is not limited to the flow valve, and may be controlled by a mechanism including a removable short pipe, a closing flange and the like.
  • the said mechanism controls the supply flow rate of the steam from the said steam supply line for heat exchange to the said heat exchanger, respectively.
  • a power generation assistance system is provided on the upstream side of the bypass line across the heat exchanger for each of the plurality of power generation facilities, and an inlet valve that controls acceptance of each of the plurality of power generation facilities to the bypass line.
  • an outlet valve provided downstream of the bypass line across the heat exchanger for each of the plurality of power generation facilities and controlling discharge from the bypass line to the plurality of power generation facilities.
  • the outlet valve controls the flow rate of water discharged from the bypass line to each of the plurality of power generation facilities.
  • the inlet valve controls the flow rate of water received from each of the plurality of power generation facilities to the bypass line.
  • the said inlet valve and the said outlet valve are opened and closed according to the operating condition of the corresponding said power generation equipment.
  • a condensate line is connected to the heat exchanger on the upstream side and to the steam generation unit on the downstream side, and passes through condensate of steam preheated water flowing through the bypass line; It is preferable to further include a pump disposed in the condensate line between the heat exchanger and the steam generation unit that generates steam using heat derived from renewable energy.
  • the present invention also relates to a thermal power plant comprising a steam generation auxiliary system and a plurality of power generation facilities connected to the power generation auxiliary system.
  • the thermal power plant 1 includes a plurality of power generation facilities 10 (systems, units) and a power generation assistance system 100.
  • the thermal power plant 1 generates steam using the heat generated by burning fossil fuel to generate electricity.
  • the thermal power plant 1 preheats water to be steam using heat derived from renewable energy (for example, wind power, solar power, geothermal heat, combustion heat of RDF (waste solid fuel, Refused Derived Fuel), etc.) Do.
  • renewable energy for example, wind power, solar power, geothermal heat, combustion heat of RDF (waste solid fuel, Refused Derived Fuel), etc.
  • Each of the plurality of power generation facilities 10 includes a boiler 11, a steam generation line for power generation 12, a turbine 13, a generator 14, a condenser 15, a water supply line 16, a water supply heater 17, and a bleed line 18.
  • the "line” in this specification is a generic term of the line which can distribute
  • the boiler 11 generates steam from water using the heat generated by burning fossil fuel. Specifically, the boiler 11 generates superheated steam for power generation using the combustion heat of fossil fuel.
  • One end of the power generation steam supply line 12 is connected to the boiler 11. Overheated steam generated by the boiler 11 flows through the power generation steam supply line 12.
  • the turbine 13 is connected to the other end of the power generation steam supply line 12.
  • the turbine 13 is a steam turbine.
  • the turbine 13 is rotated about the rotation shaft (not shown) by the superheated steam supplied from the boiler 11.
  • the turbine 13 is rotated about a rotation shaft (not shown) by an axial power generated by expansion of the superheated steam flowing in from the power generation steam supply line 12.
  • the generator 14 is connected to the turbine 13. Specifically, the generator 14 is connected to the rotation shaft of the turbine 13. The generator 14 generates power by rotation of the rotation shaft of the turbine 13.
  • the condenser 15 is disposed at the outlet of the turbine 13.
  • the turbine exhaust (steam) that has rotated the turbine 13 flows into the condenser 15.
  • the condenser 15 cools the turbine exhaust with cooling water (not shown) to generate condensed water. Further, the condenser 15 combines drain water, which will be described later, with condensed water to generate water to be supplied to the boiler 11.
  • One end of the water supply line 16 is connected to the condenser 15, and the other end is connected to the boiler 11.
  • the water generated by the condenser 15 flows through the water supply line 16 toward the boiler 11.
  • One end of the bleed line 18 is connected to the turbine 13. Steam extracted from a part of the steam flowing into the turbine 13 flows through the bleed line 18.
  • the feed water heater 17 is disposed in the water feed line 16. Further, the other end of the bleed line 18 is connected to the feed water heater 17, and the extracted steam flows into the inside.
  • the feed water heater 17 exchanges heat between the water flowing through the water feed line 16 and the extracted steam to preheat the water flowing through the water feed line 16.
  • the feed water heater 17 sends drain water, in which the extracted steam is condensed by heat exchange, to the condenser 15 through the drain water flow line 19.
  • the power generation assistance system 100 is a system for assisting the power generation by the power generation facility 10, and is installed in parallel to the plurality of power generation facilities 10. Specifically, the power generation assistance system 100 is a system for supplying heat derived from renewable energy to the power generation facility 10 by preheating water flowing through the water supply line 16.
  • the auxiliary power generation system 100 includes a bypass line 110, a steam generation unit 120, a heat exchange steam supply line 130, a heat exchanger 140, a condensate line 150, a pump 160, an inlet valve 170, and an outlet valve 180. And.
  • the bypass line 110 is connected to each of the water supply lines 16 of the plurality of power generation facilities 10 and bypasses the water supply line 16. That is, the bypass line 110 is a line for receiving water from the upstream side of the water supply line 16 and discharging it to the downstream side of the water supply line 16.
  • the bypass line 110 includes one heat exchange line 111, a plurality of receiving lines 112, and a plurality of dispensing lines 113.
  • the heat exchange line 111 is disposed across the plurality of power generation facilities 10. In other words, the heat exchange line 111 is disposed as a line common to the plurality of power generation facilities 10.
  • the heat exchange line 111 is a line through which the water received from the plurality of power generation facilities 10 flows.
  • the heat exchange line 111 passes through a heat exchanger 140 described later.
  • the receiving line 112 is provided for each of the plurality of power generation facilities 10 and connects the upstream side of the heat exchange line 111 and the upstream side of the water supply line 16. Specifically, the upstream end of the receiving line 112 is connected to the upstream of the water supply line 16 of the power generation facility 10, and the downstream end of the receiving line 112 is connected to the heat exchange line 111.
  • the delivery line 113 is provided for each of the plurality of power generation facilities 10, and connects the downstream side of the heat exchange line 111 and the downstream side of the water supply line 16. Specifically, the upstream end of the dispensing line 113 is connected to the downstream side of the heat exchange line 111, and the downstream end of the dispensing line 113 is connected to the downstream side of the water supply line 16 of the power generation facility 10 .
  • the steam generation unit 120 generates steam for heat exchange (for preheating) using heat derived from renewable energy.
  • the steam generation unit 120 generates steam using heat derived from renewable energy (eg, sunlight, geothermal energy, wind power, combustion of RDF, etc.).
  • the steam generation unit 120 is, for example, a boiler 11 that burns RDF, and generates steam using the combustion heat of RDF.
  • One end of the heat exchange steam supply line 130 is connected to the steam generation unit 120.
  • the steam supplied from the steam generation unit 120 flows through the heat exchange steam supply line 130.
  • the heat exchanger 140 is connected to the other end of the heat exchange steam supply line 130.
  • a part of the bypass line 110 is disposed inside.
  • a part between the upstream side and the downstream side of the heat exchange line 111 is disposed inside.
  • the heat exchanger 140 uses the steam supplied from the heat exchange steam supply line 130 to preheat water flowing through the bypass line 110 (heat exchange line 111).
  • the heat exchanger 140 brings the steam introduced into the interior from the heat exchange steam supply line 130 into contact with the bypass line 110 (the heat exchange line 111), thereby introducing the introduced steam and the bypass line 110 (the heat exchange line 111). Heat is exchanged with the water flowing through the heat exchange line 111).
  • One end (upstream side) of the condensate line 150 is connected to the heat exchanger 140, and the other end (downstream side) is connected to the steam generation unit 120.
  • the condensate line 150 steam condensate that has preheated water flowing in the bypass line 110 flows. That is, the condensate of the steam heat-exchanged in the heat exchanger 140 flows through the condensate line 150.
  • the pump 160 is provided in the condensate line 150. Specifically, the pump 160 is disposed in the condensate line 150 between the heat exchanger 140 and the steam generation unit 120 that generates steam using heat derived from renewable energy. The pump 160 sends, to the steam generation unit 120, the condensed steam of the heat exchanged with the water flowing through the bypass line 110 in the heat exchanger 140.
  • the inlet valve 170 is provided for each of the plurality of power generation facilities 10 and is provided on the upstream side of the bypass line 110 with the heat exchanger 140 interposed therebetween.
  • the inlet valve 170 is provided at each of the connections between the water supply line 16 and the reception line 112 to open and close the communication between the water supply line 16 and the reception line 112.
  • the inlet valve 170 controls the reception of water from each of the plurality of power generation facilities 10 to the bypass line 110 (the heat exchange line 111) by opening and closing the connection with the reception line 112.
  • a plurality of outlet valves 180 are provided for each of the plurality of power generation facilities 10 and provided downstream of the bypass line 110 with the heat exchanger 140 interposed therebetween.
  • the outlet valve 180 is provided in each of the payout lines 113 to open and close the payout line 113.
  • the outlet valve 180 controls the discharge of water to the plurality of power generation facilities 10 by opening and closing the discharge line 113.
  • the operation of the power generation assistance system 100 will be described.
  • an operation of preheating water flowing through the bypass line 110 using the steam generated by the steam generation unit 120 will be described.
  • steam generation unit 120 steam is generated using heat derived from renewable energy.
  • the steam generated by the steam generation unit 120 flows through the heat exchange steam supply line 130 and is supplied to the heat exchanger 140.
  • the steam supplied to the heat exchanger 140 is introduced into the heat exchanger 140.
  • the steam introduced into the heat exchanger 140 is cooled by heat exchange with water flowing through the bypass line 110 (heat exchange line 111).
  • the cooled steam is condensed (drain water) and discharged from the heat exchanger 140 to the condensing line 150.
  • the condensed water discharged to the condensed water line 150 is pressurized by the pump 160 and returned to the steam generation unit 120.
  • the inlet valve 170 and the outlet valve 180 By opening the inlet valve 170 and the outlet valve 180 arranged corresponding to each of the plurality of power generation facilities 10, water from the water supply line 16 of the plurality of power generation facilities 10 passes through the receiving line 112 and a heat exchange line Accepted at 111 The water received in the heat exchange line 111 is preheated through the heat exchanger 140 and discharged to the water supply line 16 of each power generation facility 10 through the discharge line 113.
  • the inlet valve 170 and the outlet valve 180 corresponding to the power generation facility 10 to be stopped are closed. Thereby, the reception and the discharge of the water from the water supply line 16 of the power generation facility 10 to be closed to the bypass line 110 (the heat exchange line 111) are stopped.
  • the inlet valve 170 and the outlet valve 180 corresponding to the other power generation facility 10 are not closed, the reception and discharge of water from the water supply line 16 of the other power generation facility 10 to the bypass line 110 (heat exchange line 111). Will continue.
  • the reception and discharge of water from the water supply line 16 of the other power generation facility 10 to the bypass line 110 is continued.
  • a bypass line 110 is connected to each of the water supply lines 16 connected to the boiler 11 from the turbines 13 of the plurality of power generation facilities 10 and bypasses the water supply line 16, and derived from renewable energy It is connected to the steam generation unit 120 that generates steam using heat, the heat exchange steam supply line 130 through which the steam supplied from the steam generation unit 120 flows, and the heat exchange steam supply line 130, and the heat exchange steam And a heat exchanger 140 for preheating the water flowing through the bypass line 110 using the steam introduced from the supply line 130.
  • the water preheated using the heat derived from the renewable energy can be supplied to the water supply line 16 through the bypass line 110.
  • the bleed air from the bleed line 18 can be reduced, and the power generation efficiency can be improved.
  • the water supplied to the boiler 11 can be preheated using the heat derived from the renewable energy, carbon dioxide can be reduced by reducing the amount of fossil fuel used, and the economy can be improved.
  • the steam generation unit 120 can be kept operating since it can be received from the water supply line 16 of the other power generation facilities 10 to the bypass line 110. Since the steam generation unit 120 does not have to be stopped, the facility utilization rate of the power generation assistance system 100 can be improved.
  • the bypass line 110 is disposed across the plurality of power generation facilities 10, and is provided for one heat exchange line 111 passing through the heat exchanger 140 and each of the plurality of power generation facilities 10;
  • a receiving line 112 connecting the upstream side and the upstream side of the water supply line 16 and a discharge line 113 provided for each of the plurality of power generation facilities 10 and connecting the downstream side of the heat exchange line 111 and the downstream side of the water supply line 16 And included.
  • the power generation assistance system 100 is further provided upstream of the bypass line 110 across the heat exchanger 140 for each of the plurality of power generation facilities 10, and controls acceptance of each of the plurality of power generation facilities 10 to the bypass line 110
  • An inlet valve 170, and an outlet valve 180 provided downstream of the bypass line 110 across the heat exchanger 140 for each of the plurality of power generation facilities 10 and controlling the discharge from the bypass line 110 to the plurality of power generation facilities 10; It included.
  • the power generation facility 10 that receives water from the water supply line 16 to the bypass line 110 can be selectively changed. Therefore, the heat of the steam generation unit 120 can be dispersed and efficiently supplied to the power generation facility 10 in operation.
  • the inlet valve 170 and the outlet valve 180 are opened and closed in accordance with the operating condition of the corresponding power generation facility 10. Thereby, the heat generated by the steam generation unit 120 can be efficiently distributed to the power generation facility 10 in operation, and the power generation efficiency can be improved.
  • the power generation assistance system 100a according to the second embodiment is different from the first embodiment in that a plurality of bypass lines 110a are provided for each of a plurality of power generation facilities 10, as shown in FIG.
  • the power generation assistance system 100 a according to the second embodiment includes a plurality of pumps 160 a instead of the pump 160.
  • the power generation assisting system 100a according to the second embodiment includes a plurality of flow valves 190. As shown in FIG. 3, one pump 160a may be provided. Further, the flow valve 190 having a function of controlling the supply of steam may be on the inlet side of the heat exchanger 140a.
  • Each of the plurality of bypass lines 110 a is provided for each power generation facility 10. That is, the bypass line 110 a is provided in a pair with the power generation facility 10. Each of the bypass lines 110 a is provided as a line that bypasses the water supply line 16 of the power generation facility 10, the upstream end is connected to the upstream end of the water supply line 16, and the downstream end is downstream of the water supply line 16. Connected to the end.
  • the heat exchanger 140a is disposed in each of the plurality of bypass lines 110a. That is, the heat exchanger 140a is provided in a pair with the bypass line 110a.
  • the inlet valve 170a is disposed upstream of the plurality of bypass lines 110a.
  • the outlet valve 180a is disposed downstream of the plurality of bypass lines 110a.
  • the heat exchange steam supply line 130a includes one main steam supply line 131a and a plurality of secondary steam supply lines 132a.
  • the main steam supply line 131a is disposed across the plurality of heat exchangers 140a. In other words, the main steam supply line 131a is disposed as a common line to the plurality of heat exchangers 140a.
  • the upstream end of the main steam supply line 131 a is connected to the steam generation unit 120. The steam generated by the steam generation unit 120 flows through the main steam supply line 131a.
  • Each of the plurality of secondary steam supply lines 132a is disposed corresponding to the heat exchanger 140a, and the upstream end is connected to the main steam supply line 131a.
  • the downstream end of each of the plurality of secondary steam supply lines 132a is connected to the heat exchanger 140a. That is, the auxiliary steam supply line 132a is provided in a pair with the heat exchanger 140a.
  • the condensate line 150 includes a plurality of secondary condensate lines 151a and one main condensate line 152a.
  • the upstream ends of the plurality of secondary condensate lines 151a are respectively connected to the heat exchanger 140a.
  • the downstream end of each of the plurality of secondary condensing lines 151a is connected to the main condensing line 152a. That is, the auxiliary condensing line 151a is provided in a pair with the heat exchanger 140a.
  • the condensed water discharged from the heat exchanger 140a flows through the auxiliary condensed water line 151a.
  • Each of the pumps 160a is disposed in the condensate line 150a. Specifically, each of the pumps 160a is disposed in the secondary condensate line 151a. That is, the pump 160a is provided in a pair with the heat exchanger 140a. The pump 160 a pressurizes the condensate discharged from the heat exchanger 140 a and sends it to the steam generation unit 120.
  • the flow valve 190 is disposed in the condensate line 150. Specifically, each of the flow valves 190 is disposed in the secondary condensate line 151a, and is disposed downstream of the pump 160a. That is, the flow valve 190 is disposed in a pair with the heat exchanger 140a and the pump 160a.
  • the flow valve 190 opens and closes the secondary condensing line 151a to control the inflow of condensing water from the heat exchanger 140a to the primary condensing line 152a.
  • each of the plurality of flow valves 190 controls the supply of steam from the heat exchange steam supply line 130a (the secondary steam supply line 132a) to the heat exchanger 140a.
  • the flow valve 190 controls the supply flow rate of steam from the heat exchange steam supply line 130a to the heat exchanger.
  • the flow control valve 190 controls to supply 10 t / h of steam to one heat exchanger 140a, and controls to supply 20 t / h of steam to another heat exchanger 140a.
  • the downstream end of the main condensate line 152 a is connected to the steam generator 120. Condensed water that has flowed in from the plurality of sub-condensing lines 151 a flows through the main condensing line 152 a.
  • the pump 160a is arrange
  • the pump 160 a pressurizes the condensate discharged from the heat exchanger 140 a and sends it to the steam generation unit 120.
  • the steam supplied to each heat exchanger 140a is introduced into the inside of the heat exchanger 140a.
  • the steam introduced into the heat exchanger 140a exchanges heat with water flowing through the bypass line 110a to be cooled.
  • the cooled steam becomes condensed water (drain water), and is discharged from the respective heat exchangers 140 a to the auxiliary water condensing line 151 a.
  • the condensate discharged to the secondary condensate line 151a is pressurized by the respective pumps 160a and flows into the primary condensate line 152a.
  • the condensed water joined at the main condensed water line 152a is returned to the steam generation unit 120.
  • the inlet valve 170 a and the outlet valve 180 a of the bypass line 110 a connected to the power generation facility 10 to be stopped are closed. Thereby, reception of water from the water supply line 16 of the power generation facility 10 to be stopped to the bypass line 110a is stopped. Also, the supply of steam to the heat exchanger 140a for preheating the water flowing through the bypass line 110a whose reception has been stopped is also stopped. Specifically, the flow valve 190 disposed in the secondary condensate line 151a connected to the heat exchanger 140a is closed to stop the supply of steam.
  • the operation of the pump 160a disposed in the same secondary condensate line 151a as the secondary condensate line 151a in which the closed flow valve 190 is disposed is also stopped.
  • reception and discharge of water from the water supply line 16 of the power generation facility 10 to be stopped to the bypass line 110a are stopped, while reception and discharge of water from the other power generation facility 10 to the bypass line 110a is continued.
  • reception and the discharge of water from the water supply line 16 of the other power generation facility 10 to the bypass line 110a are continued.
  • the mechanism is configured to control the amount of steam supplied from the heat exchange steam supply line to the heat exchanger.
  • the amount of steam supplied to each of the heat exchangers 140a can be made different. Therefore, an appropriate amount of steam can be supplied to each heat exchanger 140a according to the amount of water flowing through the bypass line 110, the amount of heat required for preheating, and the like.
  • a plurality of bypass lines 110a are provided for each of the plurality of power generation facilities 10, and a plurality of heat exchangers 140a are provided for each of the bypass lines 110a.
  • the power generation assistance system 100a further includes a flow valve 190 that controls the supply of steam from the heat exchange steam supply line 130a to the heat exchanger 140a.
  • a main steam supply line 131a disposed across the plurality of heat exchangers 140a
  • a secondary steam supply line 132a connecting the main steam supply line 131a and the heat exchanger 140a
  • a heat exchange steam supply line 130a a heat exchange steam supply line 130a.
  • Steam can be supplied from the main steam supply line 131a to the plurality of heat exchangers 140a via the secondary steam supply line 132a.
  • the supply of steam to each of the heat exchangers 140a can be controlled by opening and closing the flow valve 190. Therefore, since the supply of steam to the heat exchanger 140a can be switched according to the operating condition of the power generation facility 10, the heat derived from the regenerated energy can be used efficiently.
  • one heat exchanger 140 is used, but the invention is not limited thereto.
  • a plurality of heat exchangers 140 may be provided, and the heat exchange lines 111 may be disposed to pass through the plurality of heat exchangers 140.
  • redundancy may be enhanced by setting at least one of the heat exchange line 111, the heat exchange steam supply line 130, and the condensate line 150 as a plurality of lines (systems).
  • a plurality of heat exchangers may be used properly for each temperature range in which heat exchange is performed. By selecting materials that are cost minimal at each temperature, a lower cost system can be obtained.
  • the bypass line 110a bypassing the water supply line 16 of the power generation facility 10 is separately provided in each power generation facility 10.
  • the line 111 may be provided across the plurality of heat exchangers 140a in the second embodiment, and the bypass lines 110a of the plurality of power generation facilities 10 may be connected to the plurality of heat exchangers 140a. That is, although the bypass line 110a bypassing the water supply line 16 of the power generation facility 10 is separately provided in each power generation facility 10, the present invention is not limited thereto.
  • one heat exchange line 111 of the first embodiment may be employed for a plurality of heat exchangers 140a.
  • one heat exchange line 111 may be disposed across the plurality of heat exchangers 140 and may be provided to pass through the plurality of heat exchangers 140 a.
  • each power generation facility 10 (bypass line 110a) may be connected to one heat exchange line 111.
  • the main steam supply line 131a was one, it is not restrict
  • a plurality of main steam supply lines 131a may be provided to enhance redundancy.
  • redundancy may be enhanced by providing a plurality of main condensate lines 152a.
  • the inlet valve 170 and the outlet valve 180 corresponding to the power generation facility 10 to be stopped are closed for opening and closing the inlet valve 170 and the outlet valve 180, but the invention is not limited thereto.
  • the inlet valve 170 and the outlet valve 180 may be determined to be closed or opened according to the thermal energy that each of the power generation facilities 10 can accept and the thermal energy that can be provided by the power generation assistance system 100, 100a.
  • the inlet valve 170 and the outlet valve 180 of the power generation facility 10 having large allowable thermal energy are opened, and the inlet valve 170 and the outlet valve 180 of the small power generation facility 10 having acceptable thermal energy. May be closed. Thereby, the thermal efficiency of the thermal power plant 1 whole can be improved.
  • the inlet valve 170 may control the flow rate of water received from each of the plurality of power generation facilities 10 to the bypass line 110.
  • the outlet valve 180 may control the flow rate of water discharged from each of the plurality of bypass lines 110 to each of the power generation facilities 10.
  • the inlet valves 170 may be controlled to receive different amounts of water from each of the power generation facilities 10, and the outlet valves 180 may dispense different amounts of water to each of the power generation facilities 10. It may be controlled.
  • the inlet valve 170 may be controlled to receive 20 t / h of water from one power generation facility 10 and may be controlled to receive 5 t / h of water from another power generation facility 10.
  • outlet valve 180 may be controlled to dispense 20 t / h of water to one power generation facility 10 and may be controlled to dispense 5 t / h of water to another power generation facility 10.
  • the amount of water flowing through the bypass line 110 can be changed for each power generation facility 10, and control in line with the situation for each power generation facility 10 can be realized.

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  • Chemical & Material Sciences (AREA)
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  • General Engineering & Computer Science (AREA)
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Abstract

The present invention provides an auxiliary power generation system and a thermal power plant, wherein the facility utilization rate can be improved. This auxiliary power generation system 100 is provided with: bypass lines 110 which are connected to respective water supply lines 16 that are connected from turbines 13 to boilers 11 in a plurality of power generation facilities 10, and bypass the water supply lines 16; a steam generation unit 120 which generates steam by using heat derived from renewable energy; a heat exchanging-steam supply line 130 in which the steam supplied from the steam generation unit 120 circulates; and a heat exchanger 140 which is connected to the heat exchanging-steam supply line 130 and uses the steam introduced from the heat exchanging-steam supply line 130 to pre-heat water circulating in the bypass lines 110.

Description

発電補助システム及び火力発電プラントPower generation assistance system and thermal power plant
　本発明は、発電補助システム及び火力発電プラントに関する。 The present invention relates to a power generation assistance system and a thermal power plant.
　従来より、ボイラにおいて化石燃料を燃焼することで蒸気を発生させ、蒸気タービンに過熱蒸気を供給することで発電する発電設備が知られている。一般的に、このような発電設備では、ボイラに供給される水の温度を高くすることができれば、発電効率が向上する。そこで、蒸気タービンから抽気された抽気蒸気でボイラに供給される水を予熱することが行われている。また、再生可能エネルギーに由来する熱源（例えば、他のボイラ）を別途設け、この熱源を用いてボイラに給水される水を予熱する蒸気タービンプラントが提案されている（例えば、特許文献１参照）。 BACKGROUND ART Conventionally, a power generation facility is known that generates steam by burning fossil fuel in a boiler and supplies overheated steam to a steam turbine to generate power. In general, in such a power generation facility, if the temperature of water supplied to the boiler can be increased, the power generation efficiency is improved. Therefore, it is practiced to preheat water supplied to the boiler with the extracted steam extracted from the steam turbine. In addition, a steam turbine plant has been proposed in which a heat source (for example, another boiler) derived from renewable energy is separately provided and the water supplied to the boiler is preheated using this heat source (for example, see Patent Document 1) .
特開２０１５－５２４２７号公報JP, 2015-52427, A
　ところで、再生可能エネルギーから熱を生成する設備（以下、補助設備という）を発電設備とは別途設ける場合、補助設備の稼働率（設備利用率）を考慮する必要がある。例えば、発電設備が停止するとともに補助設備を停止する場合、補助設備の設備利用率が低下し、補助設備の経済性評価が低下する。特に、発電設備の点検等では長期間（例えば、半年間等）、発電設備が停止することがあり、補助設備も長期間停止することとなる。すると、補助設備の経済性評価が大きく低下する。そこで、補助設備の設備利用率を高めることが設置の上で重要となる。 When equipment for generating heat from renewable energy (hereinafter referred to as auxiliary equipment) is provided separately from the power generation equipment, it is necessary to consider the operating rate (utilization factor of the auxiliary equipment) of the auxiliary equipment. For example, when the power generation facility is shut down and the auxiliary facility is shut down, the utilization factor of the auxiliary facility is lowered, and the economic evaluation of the auxiliary facility is lowered. In particular, in the inspection of the power generating equipment, the power generating equipment may be stopped for a long time (for example, half a year), and the auxiliary equipment is also stopped for a long time. As a result, the evaluation of the economics of the auxiliary equipment is greatly reduced. Therefore, it is important on the installation to increase the utilization factor of the auxiliary equipment.
　特許文献１に記載された蒸気タービンプラントでは、発電設備ごとに補助設備を設けており、発電設備が停止した場合、補助設備から供給される熱が余剰となる。このため、補助設備を有効に活用することができず、補助設備の設備利用率を向上することはできない。 In the steam turbine plant described in Patent Document 1, an auxiliary facility is provided for each power generation facility, and when the power generation facility stops, the heat supplied from the auxiliary facility becomes surplus. Therefore, the auxiliary equipment can not be used effectively, and the equipment utilization rate of the auxiliary equipment can not be improved.
　本発明は、設備利用率を向上することが可能な発電補助システム及び火力発電プラントを提供することを目的とする。 An object of the present invention is to provide a power generation assistance system and a thermal power plant capable of improving the capacity factor.
　本発明は、化石燃料を燃焼させて蒸気を生成するボイラからタービンに蒸気を供給して発電する発電設備を複数有する火力発電プラントに配置され、前記発電設備による発電を補助する発電補助システムであって、複数の前記発電設備のタービンからボイラに接続される給水ラインのそれぞれに接続され、給水ラインをバイパスするバイパスラインと、再生可能エネルギーに由来する熱を用いて蒸気を生成する蒸気生成部と、前記蒸気生成部から供給される蒸気が流通する熱交換用蒸気供給ラインと、前記熱交換用蒸気供給ラインに接続され、前記熱交換用蒸気供給ラインから導入される蒸気を用いて前記バイパスラインを流通する水を予熱する熱交換器と、を備える発電補助システムに関する。 The present invention is a power generation assistance system that is disposed in a thermal power plant having a plurality of power generation facilities that supply steam from a boiler that generates fossil fuel by burning fossil fuel to generate steam to generate power, and assists the power generation by the power generation facility. And a bypass line connected to each of the plurality of water supply lines connected from the turbines of the power generation equipment to the boiler, and bypassing the water supply line, and a steam generation unit generating steam using heat derived from renewable energy A heat exchange steam supply line through which steam supplied from the steam generation unit flows, and the bypass line connected to the heat exchange steam supply line using the steam introduced from the heat exchange steam supply line And a heat exchanger for preheating water flowing therethrough.
　また、前記バイパスラインは、複数の前記発電設備に跨って配置され、前記熱交換器を通る１つの熱交換用ラインと、複数の前記発電設備ごとに設けられ、前記熱交換用ラインの上流側と給水ラインの上流側とを接続する受入ラインと、複数の前記発電設備ごとに設けられ、前記熱交換用ラインの下流側と給水ラインの下流側とを接続する払出ラインと、を備えることが好ましい。 The bypass line is disposed across a plurality of the power generation facilities, and is provided for one heat exchange line passing through the heat exchanger and for each of the plurality of power generation facilities, and the upstream side of the heat exchange lines A receiving line connecting the water supply line and the upstream side of the water supply line, and a dispensing line provided for each of the plurality of power generation facilities and connecting the downstream side of the heat exchange line and the downstream side of the water supply line. preferable.
　また、前記バイパスラインは、複数の前記発電設備ごとに複数設けられ、前記熱交換器は、前記バイパスラインごとに複数設けられることが好ましい。 Preferably, a plurality of bypass lines are provided for each of the plurality of power generation facilities, and a plurality of heat exchangers are provided for each of the bypass lines.
　また、前記熱交換器は複数設けられ、１つの前記熱交換用ラインは、複数の前記熱交換器に跨って配置されることが好ましい。 Preferably, a plurality of the heat exchangers are provided, and one heat exchange line is disposed across the plurality of the heat exchangers.
　また、発電補助システムは、前記熱交換用蒸気供給ラインから前記熱交換器への蒸気の供給をそれぞれ制御する流通弁を更に備え、前記熱交換用蒸気供給ラインは、複数の前記熱交換器に跨って配置される主蒸気供給ラインと、前記主蒸気供給ラインと前記熱交換器とを接続する副蒸気供給ラインと、を備えることが好ましい。また、蒸気の供給の制御は、流通弁に制限されず、取り外し可能な短管や閉止フランジなどを含む機構で制御しても良い。 In addition, the auxiliary power generation system further includes a flow control valve for controlling supply of steam from the heat exchange steam supply line to the heat exchanger, and the heat exchange steam supply line includes a plurality of heat exchangers. It is preferable to provide a main steam supply line disposed across and a secondary steam supply line connecting the main steam supply line and the heat exchanger. Further, the control of the supply of steam is not limited to the flow valve, and may be controlled by a mechanism including a removable short pipe, a closing flange and the like.
　また、前記機構が、前記熱交換用蒸気供給ラインから前記熱交換器への蒸気の供給流量をそれぞれ制御することが好ましい。 Moreover, it is preferable that the said mechanism controls the supply flow rate of the steam from the said steam supply line for heat exchange to the said heat exchanger, respectively.
　また、発電補助システムは、複数の前記発電設備ごとに前記熱交換器を挟んで前記バイパスラインの上流側に設けられ、複数の前記発電設備のそれぞれから前記バイパスラインへの受入を制御する入口弁と、複数の前記発電設備ごとに前記熱交換器を挟んで前記バイパスラインの下流側に設けられ、前記バイパスラインから複数の前記発電設備への払出を制御する出口弁と、を更に備えることが好ましい。 In addition, a power generation assistance system is provided on the upstream side of the bypass line across the heat exchanger for each of the plurality of power generation facilities, and an inlet valve that controls acceptance of each of the plurality of power generation facilities to the bypass line. And an outlet valve provided downstream of the bypass line across the heat exchanger for each of the plurality of power generation facilities and controlling discharge from the bypass line to the plurality of power generation facilities. preferable.
　また、前記出口弁が，前記バイパスラインから複数の前記発電設備のそれぞれへ払出する水の流量を制御することが好ましい。 Preferably, the outlet valve controls the flow rate of water discharged from the bypass line to each of the plurality of power generation facilities.
　また、前記入口弁が，複数の前記発電設備のそれぞれから前記バイパスラインへ受入する水の流量を制御することが好ましい。 Preferably, the inlet valve controls the flow rate of water received from each of the plurality of power generation facilities to the bypass line.
　また、前記入口弁及び前記出口弁は、対応する前記発電設備の運転状況に応じて開閉されることが好ましい。 Moreover, it is preferable that the said inlet valve and the said outlet valve are opened and closed according to the operating condition of the corresponding said power generation equipment.
　また、発電補助システムは、上流側が前記熱交換器に接続され、下流側が前記蒸気生成部に接続され、前記バイパスラインを流通する水を予熱した蒸気の復水を流通する復水ラインと、前記熱交換器と再生可能エネルギーに由来する熱を用いて蒸気を生成する前記蒸気生成部との間の前記復水ラインに配置されるポンプと、を更に備えることが好ましい。 In the power generation assistance system, a condensate line is connected to the heat exchanger on the upstream side and to the steam generation unit on the downstream side, and passes through condensate of steam preheated water flowing through the bypass line; It is preferable to further include a pump disposed in the condensate line between the heat exchanger and the steam generation unit that generates steam using heat derived from renewable energy.
　また、本発明は、蒸気発電補助システムと、発電補助システムに接続される複数の発電設備と、を備える火力発電プラントに関する。 The present invention also relates to a thermal power plant comprising a steam generation auxiliary system and a plurality of power generation facilities connected to the power generation auxiliary system.
　本発明によれば、設備利用率を向上することが可能な発電補助システム及び火力発電プラントを提供することができる。 According to the present invention, it is possible to provide a power generation assistance system and a thermal power plant capable of improving the facility utilization rate.
本発明の第１実施形態に係る発電補助システムを備える火力発電プラントの概略構成図である。BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic block diagram of a thermal-power-generation plant provided with the power generation assistance system which concerns on 1st Embodiment of this invention. 本発明の第２実施形態に係る発電補助システムを備える火力発電プラントの概略構成図である。It is a schematic block diagram of a thermal power generation plant provided with a power generation assistance system concerning a 2nd embodiment of the present invention. 第２実施形態の発電補助システムを備える火力発電プラントの他の概略構成図である。It is another schematic block diagram of a thermal power generation plant provided with the power generation assistance system of 2nd Embodiment.
　以下、本発明に係る発電補助システム及び火力発電プラントの各実施形態について図面を参照して説明する。 Hereinafter, embodiments of a power generation assistance system and a thermal power plant according to the present invention will be described with reference to the drawings.
［第１実施形態］
　まず、本発明の第１実施形態に係る発電補助システム１００及び火力発電プラント１について、図１を参照して説明する。
　火力発電プラント１は、図１に示すように、複数の発電設備１０（系統、号機）と、発電補助システム１００と、を備える。火力発電プラント１は、化石燃料を燃焼させることで発生した熱を用いて蒸気を生成して発電する。また、火力発電プラント１は、再生可能エネルギー（例えば、風力、太陽光、地熱、ＲＤＦ（廃棄物固形燃料、Ｒｅｆｕｓｅ　Ｄｅｒｉｖｅｄ　Ｆｕｅｌ）の燃焼熱等）に由来する熱を用いて蒸気となる水を予熱する。 First Embodiment
First, a power generation assistance system 100 and a thermal power plant 1 according to a first embodiment of the present invention will be described with reference to FIG.
As shown in FIG. 1, the thermal power plant 1 includes a plurality of power generation facilities 10 (systems, units) and a power generation assistance system 100. The thermal power plant 1 generates steam using the heat generated by burning fossil fuel to generate electricity. In addition, the thermal power plant 1 preheats water to be steam using heat derived from renewable energy (for example, wind power, solar power, geothermal heat, combustion heat of RDF (waste solid fuel, Refused Derived Fuel), etc.) Do.
　複数の発電設備１０のそれぞれは、ボイラ１１と、発電用蒸気供給ライン１２と、タービン１３と、発電機１４と、復水器１５と、給水ライン１６と、給水加熱器１７と、抽気ライン１８と、を備える。なお、本明細書における「ライン」とは、流路、径路、管路等の流体の流通が可能なラインの総称である。 Each of the plurality of power generation facilities 10 includes a boiler 11, a steam generation line for power generation 12, a turbine 13, a generator 14, a condenser 15, a water supply line 16, a water supply heater 17, and a bleed line 18. And. In addition, the "line" in this specification is a generic term of the line which can distribute | circulate the fluid of a flow path, a path, a pipe line etc.
　ボイラ１１は、化石燃料を燃焼させて発生した熱を用いて水から蒸気を生成する。具体的には、ボイラ１１は、化石燃料の燃焼熱を用いて発電用の過熱蒸気を生成する。 The boiler 11 generates steam from water using the heat generated by burning fossil fuel. Specifically, the boiler 11 generates superheated steam for power generation using the combustion heat of fossil fuel.
　発電用蒸気供給ライン１２は、一端がボイラ１１に接続される。発電用蒸気供給ライン１２には、ボイラ１１で生成された過熱蒸気が流通する。 One end of the power generation steam supply line 12 is connected to the boiler 11. Overheated steam generated by the boiler 11 flows through the power generation steam supply line 12.
　タービン１３は、発電用蒸気供給ライン１２の他端に接続される。本実施形態において、タービン１３は蒸気タービンである。タービン１３は、ボイラ１１から供給される過熱蒸気により、回転軸（図示せず）を軸心として回動する。具体的には、タービン１３は、発電用蒸気供給ライン１２から流入した過熱蒸気が膨張することで発生する軸動力により、回転軸（図示せず）を軸心として回転する。 The turbine 13 is connected to the other end of the power generation steam supply line 12. In the present embodiment, the turbine 13 is a steam turbine. The turbine 13 is rotated about the rotation shaft (not shown) by the superheated steam supplied from the boiler 11. Specifically, the turbine 13 is rotated about a rotation shaft (not shown) by an axial power generated by expansion of the superheated steam flowing in from the power generation steam supply line 12.
　発電機１４は、タービン１３に接続される。具体的には、発電機１４は、タービン１３の回転軸に接続される。発電機１４は、タービン１３の回転軸の回動によって発電する。 The generator 14 is connected to the turbine 13. Specifically, the generator 14 is connected to the rotation shaft of the turbine 13. The generator 14 generates power by rotation of the rotation shaft of the turbine 13.
　復水器１５は、タービン１３の出口に配置される。復水器１５には、タービン１３を回転させたタービン排気（蒸気）が流入する。復水器１５は、冷却水（図示せず）でタービン排気を冷却して復水を生成する。また、復水器１５は、後述するドレン水を復水に合流させてボイラ１１に供給される水を生成する。 The condenser 15 is disposed at the outlet of the turbine 13. The turbine exhaust (steam) that has rotated the turbine 13 flows into the condenser 15. The condenser 15 cools the turbine exhaust with cooling water (not shown) to generate condensed water. Further, the condenser 15 combines drain water, which will be described later, with condensed water to generate water to be supplied to the boiler 11.
　給水ライン１６は、一端が復水器１５に接続され、他端がボイラ１１に接続される。給水ライン１６には、復水器１５により生成された水がボイラ１１に向けて流通する。 One end of the water supply line 16 is connected to the condenser 15, and the other end is connected to the boiler 11. The water generated by the condenser 15 flows through the water supply line 16 toward the boiler 11.
　抽気ライン１８は、一端がタービン１３に接続される。抽気ライン１８には、タービン１３に流入した蒸気の一部から抽気された蒸気が流通する。 One end of the bleed line 18 is connected to the turbine 13. Steam extracted from a part of the steam flowing into the turbine 13 flows through the bleed line 18.
　給水加熱器１７は、給水ライン１６に配置される。また、給水加熱器１７には、抽気ライン１８の他端が接続され、抽気された蒸気が内部に流入する。給水加熱器１７は、給水ライン１６を流通する水と抽気された蒸気との間で熱交換して給水ライン１６を流通する水を予熱する。給水加熱器１７は、抽気された蒸気が熱交換により凝縮したドレン水をドレン水流通ライン１９を介して復水器１５に送る。 The feed water heater 17 is disposed in the water feed line 16. Further, the other end of the bleed line 18 is connected to the feed water heater 17, and the extracted steam flows into the inside. The feed water heater 17 exchanges heat between the water flowing through the water feed line 16 and the extracted steam to preheat the water flowing through the water feed line 16. The feed water heater 17 sends drain water, in which the extracted steam is condensed by heat exchange, to the condenser 15 through the drain water flow line 19.
　発電補助システム１００は、発電設備１０による発電を補助するシステムであり、複数の発電設備１０に並設される。具体的には、発電補助システム１００は、給水ライン１６を流通する水を予熱することで、再生可能エネルギーに由来する熱を発電設備１０に供給するシステムである。発電補助システム１００は、バイパスライン１１０と、蒸気生成部１２０と、熱交換用蒸気供給ライン１３０と、熱交換器１４０と、復水ライン１５０と、ポンプ１６０と、入口弁１７０と、出口弁１８０と、を備える。 The power generation assistance system 100 is a system for assisting the power generation by the power generation facility 10, and is installed in parallel to the plurality of power generation facilities 10. Specifically, the power generation assistance system 100 is a system for supplying heat derived from renewable energy to the power generation facility 10 by preheating water flowing through the water supply line 16. The auxiliary power generation system 100 includes a bypass line 110, a steam generation unit 120, a heat exchange steam supply line 130, a heat exchanger 140, a condensate line 150, a pump 160, an inlet valve 170, and an outlet valve 180. And.
　バイパスライン１１０は、複数の発電設備１０の給水ライン１６のそれぞれに接続され、給水ライン１６をバイパスする。即ち、バイパスライン１１０は、給水ライン１６の上流側から水を受入して、給水ライン１６の下流側に払出するラインである。バイパスライン１１０は、１つの熱交換用ライン１１１と、複数の受入ライン１１２と、複数の払出ライン１１３と、を備える。 The bypass line 110 is connected to each of the water supply lines 16 of the plurality of power generation facilities 10 and bypasses the water supply line 16. That is, the bypass line 110 is a line for receiving water from the upstream side of the water supply line 16 and discharging it to the downstream side of the water supply line 16. The bypass line 110 includes one heat exchange line 111, a plurality of receiving lines 112, and a plurality of dispensing lines 113.
　熱交換用ライン１１１は、複数の発電設備１０に跨って配置される。換言すると、熱交換用ライン１１１は、複数の発電設備１０に共通のラインとして配置される。熱交換用ライン１１１は、複数の発電設備１０から受入された水が流通するラインである。熱交換用ライン１１１は、後述する熱交換器１４０を通る。 The heat exchange line 111 is disposed across the plurality of power generation facilities 10. In other words, the heat exchange line 111 is disposed as a line common to the plurality of power generation facilities 10. The heat exchange line 111 is a line through which the water received from the plurality of power generation facilities 10 flows. The heat exchange line 111 passes through a heat exchanger 140 described later.
　受入ライン１１２は、複数の発電設備１０ごとに設けられ、熱交換用ライン１１１の上流側と給水ライン１６の上流側とを接続する。具体的に、受入ライン１１２の上流側端部は、発電設備１０の給水ライン１６の上流側に接続され、受入ライン１１２の下流側端部は、熱交換用ライン１１１に接続される。 The receiving line 112 is provided for each of the plurality of power generation facilities 10 and connects the upstream side of the heat exchange line 111 and the upstream side of the water supply line 16. Specifically, the upstream end of the receiving line 112 is connected to the upstream of the water supply line 16 of the power generation facility 10, and the downstream end of the receiving line 112 is connected to the heat exchange line 111.
　払出ライン１１３は、複数の発電設備１０ごとに設けられ、熱交換用ライン１１１の下流側と給水ライン１６の下流側とを接続する。具体的に、払出ライン１１３の上流側端部は、熱交換用ライン１１１の下流側に接続され、払出ライン１１３の下流側端部は、発電設備１０の給水ライン１６の下流側に接続される。 The delivery line 113 is provided for each of the plurality of power generation facilities 10, and connects the downstream side of the heat exchange line 111 and the downstream side of the water supply line 16. Specifically, the upstream end of the dispensing line 113 is connected to the downstream side of the heat exchange line 111, and the downstream end of the dispensing line 113 is connected to the downstream side of the water supply line 16 of the power generation facility 10 .
　蒸気生成部１２０は、再生可能エネルギーに由来する熱を用いて熱交換用（予熱用）の蒸気を生成する。蒸気生成部１２０は、再生可能エネルギー（例えば、太陽光、地熱、風力、又はＲＤＦの燃焼等）に由来する熱を用いて蒸気を生成する。本実施形態において、蒸気生成部１２０は、一例としてＲＤＦを燃焼するボイラ１１であり、ＲＤＦの燃焼熱を用いて蒸気を生成する。 The steam generation unit 120 generates steam for heat exchange (for preheating) using heat derived from renewable energy. The steam generation unit 120 generates steam using heat derived from renewable energy (eg, sunlight, geothermal energy, wind power, combustion of RDF, etc.). In the present embodiment, the steam generation unit 120 is, for example, a boiler 11 that burns RDF, and generates steam using the combustion heat of RDF.
　熱交換用蒸気供給ライン１３０は、一端が蒸気生成部１２０に接続される。熱交換用蒸気供給ライン１３０には、蒸気生成部１２０から供給される蒸気が流通する。 One end of the heat exchange steam supply line 130 is connected to the steam generation unit 120. The steam supplied from the steam generation unit 120 flows through the heat exchange steam supply line 130.
　熱交換器１４０は、熱交換用蒸気供給ライン１３０の他端に接続される。また、熱交換器１４０には、バイパスライン１１０の一部が内部に配置される。具体的には、熱交換器１４０には、熱交換用ライン１１１の上流側と下流側の間の一部が内部に配置される。熱交換器１４０は、熱交換用蒸気供給ライン１３０から供給される蒸気を用いてバイパスライン１１０（熱交換用ライン１１１）を流通する水を予熱する。具体的には、熱交換器１４０は、熱交換用蒸気供給ライン１３０から内部に導入される蒸気をバイパスライン１１０（熱交換用ライン１１１）に接触させることで、導入した蒸気とバイパスライン１１０（熱交換用ライン１１１）を流通する水との間で熱交換する。 The heat exchanger 140 is connected to the other end of the heat exchange steam supply line 130. In the heat exchanger 140, a part of the bypass line 110 is disposed inside. Specifically, in the heat exchanger 140, a part between the upstream side and the downstream side of the heat exchange line 111 is disposed inside. The heat exchanger 140 uses the steam supplied from the heat exchange steam supply line 130 to preheat water flowing through the bypass line 110 (heat exchange line 111). Specifically, the heat exchanger 140 brings the steam introduced into the interior from the heat exchange steam supply line 130 into contact with the bypass line 110 (the heat exchange line 111), thereby introducing the introduced steam and the bypass line 110 (the heat exchange line 111). Heat is exchanged with the water flowing through the heat exchange line 111).
　復水ライン１５０は、一端（上流側）が熱交換器１４０に接続され、他端（下流側）が蒸気生成部１２０に接続される。復水ライン１５０には、バイパスライン１１０を流通する水を予熱した蒸気の復水が流通する。即ち、復水ライン１５０には、熱交換器１４０において熱交換した蒸気の復水が流通する。 One end (upstream side) of the condensate line 150 is connected to the heat exchanger 140, and the other end (downstream side) is connected to the steam generation unit 120. In the condensate line 150, steam condensate that has preheated water flowing in the bypass line 110 flows. That is, the condensate of the steam heat-exchanged in the heat exchanger 140 flows through the condensate line 150.
　ポンプ１６０は、復水ライン１５０に設けられる。具体的には、ポンプ１６０は、熱交換器１４０と再生可能エネルギーに由来する熱を用いて蒸気を生成する蒸気生成部１２０との間の復水ライン１５０に配置される。ポンプ１６０は、熱交換器１４０においてバイパスライン１１０を流通する水と熱交換した蒸気の復水を蒸気生成部１２０へ送る。 The pump 160 is provided in the condensate line 150. Specifically, the pump 160 is disposed in the condensate line 150 between the heat exchanger 140 and the steam generation unit 120 that generates steam using heat derived from renewable energy. The pump 160 sends, to the steam generation unit 120, the condensed steam of the heat exchanged with the water flowing through the bypass line 110 in the heat exchanger 140.
　入口弁１７０は、複数の発電設備１０ごとに設けられ、熱交換器１４０を挟んでバイパスライン１１０の上流側に設けられる。本実施形態において、入口弁１７０は、給水ライン１６と受入ライン１１２の連絡部のそれぞれに設けられ、給水ライン１６と受入ライン１１２との連絡を開閉する。入口弁１７０は、受入ライン１１２との連絡部を開閉することで、複数の発電設備１０のそれぞれからバイパスライン１１０（熱交換用ライン１１１）への水の受入を制御する。 The inlet valve 170 is provided for each of the plurality of power generation facilities 10 and is provided on the upstream side of the bypass line 110 with the heat exchanger 140 interposed therebetween. In the present embodiment, the inlet valve 170 is provided at each of the connections between the water supply line 16 and the reception line 112 to open and close the communication between the water supply line 16 and the reception line 112. The inlet valve 170 controls the reception of water from each of the plurality of power generation facilities 10 to the bypass line 110 (the heat exchange line 111) by opening and closing the connection with the reception line 112.
　出口弁１８０は、複数の発電設備１０ごとに複数設けられ、熱交換器１４０を挟んでバイパスライン１１０の下流側に設けられる。本実施形態において、出口弁１８０は、払出ライン１１３のそれぞれに設けられ、払出ライン１１３を開閉する。出口弁１８０は、払出ライン１１３を開閉することで、複数の発電設備１０への水の払出を制御する。 A plurality of outlet valves 180 are provided for each of the plurality of power generation facilities 10 and provided downstream of the bypass line 110 with the heat exchanger 140 interposed therebetween. In the present embodiment, the outlet valve 180 is provided in each of the payout lines 113 to open and close the payout line 113. The outlet valve 180 controls the discharge of water to the plurality of power generation facilities 10 by opening and closing the discharge line 113.
　次に、発電補助システム１００の動作について説明する。
　まず、蒸気生成部１２０で生成された蒸気を用いてバイパスライン１１０を流通する水を予熱する動作について説明する。
　蒸気生成部１２０において、再生可能エネルギーに由来する熱を用いて蒸気が生成される。蒸気生成部１２０で生成された蒸気は、熱交換用蒸気供給ライン１３０を流通して熱交換器１４０に供給される。 Next, the operation of the power generation assistance system 100 will be described.
First, an operation of preheating water flowing through the bypass line 110 using the steam generated by the steam generation unit 120 will be described.
In the steam generation unit 120, steam is generated using heat derived from renewable energy. The steam generated by the steam generation unit 120 flows through the heat exchange steam supply line 130 and is supplied to the heat exchanger 140.
　熱交換器１４０に供給された蒸気は、熱交換器１４０の内部に導入される。熱交換器１４０の内部に導入された蒸気は、バイパスライン１１０（熱交換用ライン１１１）を流通する水との間で熱交換して冷却される。冷却された蒸気は、復水（ドレン水）となり、熱交換器１４０から復水ライン１５０に排出される。
　復水ライン１５０に排出された復水は、ポンプ１６０により加圧され、蒸気生成部１２０に還流する。 The steam supplied to the heat exchanger 140 is introduced into the heat exchanger 140. The steam introduced into the heat exchanger 140 is cooled by heat exchange with water flowing through the bypass line 110 (heat exchange line 111). The cooled steam is condensed (drain water) and discharged from the heat exchanger 140 to the condensing line 150.
The condensed water discharged to the condensed water line 150 is pressurized by the pump 160 and returned to the steam generation unit 120.
　次に、入口弁１７０及び出口弁１８０の動作について説明する。
　複数の発電設備１０のそれぞれに対応して配置された入口弁１７０及び出口弁１８０が開放されることで、複数の発電設備１０の給水ライン１６から水が受入ライン１１２を通って熱交換用ライン１１１に受入される。熱交換用ライン１１１に受入された水は、熱交換器１４０を通って予熱され、払出ライン１１３を通ってそれぞれの発電設備１０の給水ライン１６に払出される。 Next, the operation of the inlet valve 170 and the outlet valve 180 will be described.
By opening the inlet valve 170 and the outlet valve 180 arranged corresponding to each of the plurality of power generation facilities 10, water from the water supply line 16 of the plurality of power generation facilities 10 passes through the receiving line 112 and a heat exchange line Accepted at 111 The water received in the heat exchange line 111 is preheated through the heat exchanger 140 and discharged to the water supply line 16 of each power generation facility 10 through the discharge line 113.
　複数の発電設備１０のうち、１台が点検等により停止する場合、停止される発電設備１０に対応する入口弁１７０及び出口弁１８０が閉止される。これにより、閉止される発電設備１０の給水ライン１６からバイパスライン１１０（熱交換用ライン１１１）への水の受入及び払出は停止する。一方、他の発電設備１０に対応する入口弁１７０及び出口弁１８０が閉止されないことで、他の発電設備１０の給水ライン１６からバイパスライン１１０（熱交換用ライン１１１）への水の受入及び払出は継続される。また、複数系統が点検等により停止する場合であっても、他の発電設備１０の給水ライン１６からバイパスライン１１０（熱交換用ライン１１１）への水の受入及び払出は継続される。 When one of the plurality of power generation facilities 10 is stopped due to inspection or the like, the inlet valve 170 and the outlet valve 180 corresponding to the power generation facility 10 to be stopped are closed. Thereby, the reception and the discharge of the water from the water supply line 16 of the power generation facility 10 to be closed to the bypass line 110 (the heat exchange line 111) are stopped. On the other hand, since the inlet valve 170 and the outlet valve 180 corresponding to the other power generation facility 10 are not closed, the reception and discharge of water from the water supply line 16 of the other power generation facility 10 to the bypass line 110 (heat exchange line 111). Will continue. In addition, even when a plurality of systems are stopped due to inspection or the like, the reception and discharge of water from the water supply line 16 of the other power generation facility 10 to the bypass line 110 (the heat exchange line 111) is continued.
　以上のような第１実施形態に係る発電補助システム１００及び火力発電プラント１によれば、以下の効果を奏する。
（１）発電補助システム１００を、複数の発電設備１０のタービン１３からボイラ１１に接続される給水ライン１６のそれぞれに接続され、給水ライン１６をバイパスするバイパスライン１１０と、再生可能エネルギーに由来する熱を用いて蒸気を生成する蒸気生成部１２０と、蒸気生成部１２０から供給される蒸気が流通する熱交換用蒸気供給ライン１３０と、熱交換用蒸気供給ライン１３０に接続され、熱交換用蒸気供給ライン１３０から導入される蒸気を用いてバイパスライン１１０を流通する水を予熱する熱交換器１４０と、を含んで構成した。これにより、バイパスライン１１０を介して、再生可能エネルギーに由来する熱を用いて予熱した水を給水ライン１６に供給することができる。これにより、抽気ライン１８からの抽気を減らすことができ、発電効率を向上することができる。また、再生可能エネルギーに由来する熱を用いてボイラ１１に供給される水を予熱できるので、化石燃料の使用量を減らすことによる二酸化炭素の削減や、経済性を向上することができる。また、複数の発電設備１０の一部が停止した場合であっても、他の発電設備１０の給水ライン１６からバイパスライン１１０へ受入できるので、蒸気生成部１２０を運転させ続けることができる。蒸気生成部１２０を停止させずともよいので、発電補助システム１００の設備利用率を向上することができる。 According to the power generation assistance system 100 and the thermal power plant 1 according to the first embodiment as described above, the following effects can be obtained.
(1) A bypass line 110 is connected to each of the water supply lines 16 connected to the boiler 11 from the turbines 13 of the plurality of power generation facilities 10 and bypasses the water supply line 16, and derived from renewable energy It is connected to the steam generation unit 120 that generates steam using heat, the heat exchange steam supply line 130 through which the steam supplied from the steam generation unit 120 flows, and the heat exchange steam supply line 130, and the heat exchange steam And a heat exchanger 140 for preheating the water flowing through the bypass line 110 using the steam introduced from the supply line 130. Thereby, the water preheated using the heat derived from the renewable energy can be supplied to the water supply line 16 through the bypass line 110. Thereby, the bleed air from the bleed line 18 can be reduced, and the power generation efficiency can be improved. In addition, since the water supplied to the boiler 11 can be preheated using the heat derived from the renewable energy, carbon dioxide can be reduced by reducing the amount of fossil fuel used, and the economy can be improved. In addition, even when a part of the plurality of power generation facilities 10 is stopped, the steam generation unit 120 can be kept operating since it can be received from the water supply line 16 of the other power generation facilities 10 to the bypass line 110. Since the steam generation unit 120 does not have to be stopped, the facility utilization rate of the power generation assistance system 100 can be improved.
（２）バイパスライン１１０を、複数の発電設備１０に跨って配置され、熱交換器１４０を通る１つの熱交換用ライン１１１と、複数の発電設備１０ごとに設けられ、熱交換用ライン１１１の上流側と給水ライン１６の上流側とを接続する受入ライン１１２と、複数の発電設備１０ごとに設けられ、熱交換用ライン１１１の下流側と給水ライン１６の下流側とを接続する払出ライン１１３と、を含んで構成した。これにより、複数の発電設備１０の給水ライン１６から受入した水を１つの熱交換器１４０で予熱することができるので、熱効率を高めることができる。 (2) The bypass line 110 is disposed across the plurality of power generation facilities 10, and is provided for one heat exchange line 111 passing through the heat exchanger 140 and each of the plurality of power generation facilities 10; A receiving line 112 connecting the upstream side and the upstream side of the water supply line 16 and a discharge line 113 provided for each of the plurality of power generation facilities 10 and connecting the downstream side of the heat exchange line 111 and the downstream side of the water supply line 16 And included. Thereby, since the water received from the water supply line 16 of the plurality of power generation facilities 10 can be preheated by one heat exchanger 140, the thermal efficiency can be enhanced.
（３）発電補助システム１００を更に、複数の発電設備１０ごとに熱交換器１４０を挟んでバイパスライン１１０の上流側に設けられ、複数の発電設備１０のそれぞれからバイパスライン１１０への受入を制御する入口弁１７０と、複数の発電設備１０ごとに熱交換器１４０を挟んでバイパスライン１１０の下流側に設けられ、バイパスライン１１０から複数の発電設備１０への払出を制御する出口弁１８０と、を含んで構成した。これにより、給水ライン１６からバイパスライン１１０に水を受入する発電設備１０を選択的に変更できる。従って、運転している発電設備１０に対して蒸気生成部１２０の熱を分散して効率良く供給できる。 (3) The power generation assistance system 100 is further provided upstream of the bypass line 110 across the heat exchanger 140 for each of the plurality of power generation facilities 10, and controls acceptance of each of the plurality of power generation facilities 10 to the bypass line 110 An inlet valve 170, and an outlet valve 180 provided downstream of the bypass line 110 across the heat exchanger 140 for each of the plurality of power generation facilities 10 and controlling the discharge from the bypass line 110 to the plurality of power generation facilities 10; It included. Thus, the power generation facility 10 that receives water from the water supply line 16 to the bypass line 110 can be selectively changed. Therefore, the heat of the steam generation unit 120 can be dispersed and efficiently supplied to the power generation facility 10 in operation.
（４）入口弁１７０及び出口弁１８０を、対応する発電設備１０の運転状況に応じて開閉するようにした。これにより、運転中の発電設備１０に対して蒸気生成部１２０で生成された熱を効率よく振り分けることができ、発電効率を向上することができる。 (4) The inlet valve 170 and the outlet valve 180 are opened and closed in accordance with the operating condition of the corresponding power generation facility 10. Thereby, the heat generated by the steam generation unit 120 can be efficiently distributed to the power generation facility 10 in operation, and the power generation efficiency can be improved.
［第２実施形態］
　次に、本発明の第２実施形態に係る発電補助システム１００ａについて、図２及び図３を参照して説明する。第２実施形態の説明にあたって、同一構成要件については同一符号を付し、その説明を省略もしくは簡略化する。
　第２実施形態に係る発電補助システム１００ａでは、図２に示すように、バイパスライン１１０ａが、複数の発電設備１０ごとに複数設けられる点等で、第１実施形態と異なる。第２実施形態に係る発電補助システム１００ａは、ポンプ１６０に代えて、複数のポンプ１６０ａを備える。また、第２実施形態に係る発電補助システム１００ａは、複数の流通弁１９０を備える。なお，図３に示すようにポンプ１６０ａは１台でも良い。また蒸気の供給を制御する機能を持つ流通弁１９０は熱交換器１４０ａ入口側でも良い。 Second Embodiment
Next, a power generation assisting system 100 a according to a second embodiment of the present invention will be described with reference to FIGS. 2 and 3. In the description of the second embodiment, the same components will be assigned the same reference numerals, and the description thereof will be omitted or simplified.
The power generation assistance system 100a according to the second embodiment is different from the first embodiment in that a plurality of bypass lines 110a are provided for each of a plurality of power generation facilities 10, as shown in FIG. The power generation assistance system 100 a according to the second embodiment includes a plurality of pumps 160 a instead of the pump 160. Further, the power generation assisting system 100a according to the second embodiment includes a plurality of flow valves 190. As shown in FIG. 3, one pump 160a may be provided. Further, the flow valve 190 having a function of controlling the supply of steam may be on the inlet side of the heat exchanger 140a.
　複数のバイパスライン１１０ａのそれぞれは、発電設備１０ごとに設けられる。即ち、バイパスライン１１０ａは、発電設備１０と一対に設けられる。バイパスライン１１０ａのそれぞれは、発電設備１０の給水ライン１６をバイパスするラインとして設けられ、上流側端部が給水ライン１６の上流側端部に接続され、下流側端部が給水ライン１６の下流側端部に接続される。 Each of the plurality of bypass lines 110 a is provided for each power generation facility 10. That is, the bypass line 110 a is provided in a pair with the power generation facility 10. Each of the bypass lines 110 a is provided as a line that bypasses the water supply line 16 of the power generation facility 10, the upstream end is connected to the upstream end of the water supply line 16, and the downstream end is downstream of the water supply line 16. Connected to the end.
　熱交換器１４０ａは、複数のバイパスライン１１０ａのそれぞれに配置される。即ち、熱交換器１４０ａは、バイパスライン１１０ａと一対に設けられる。 The heat exchanger 140a is disposed in each of the plurality of bypass lines 110a. That is, the heat exchanger 140a is provided in a pair with the bypass line 110a.
　入口弁１７０ａは、複数のバイパスライン１１０ａの上流側にそれぞれ配置される。
　出口弁１８０ａは、複数のバイパスライン１１０ａの下流側にそれぞれ配置される。 The inlet valve 170a is disposed upstream of the plurality of bypass lines 110a.
The outlet valve 180a is disposed downstream of the plurality of bypass lines 110a.
　熱交換用蒸気供給ライン１３０ａは、１つの主蒸気供給ライン１３１ａと、複数の副蒸気供給ライン１３２ａと、を備える。
　主蒸気供給ライン１３１ａは、複数の熱交換器１４０ａに跨って配置される。換言すると、主蒸気供給ライン１３１ａは、複数の熱交換器１４０ａに対して共通のラインとして配置される。主蒸気供給ライン１３１ａは、上流側の端部が蒸気生成部１２０に接続される。主蒸気供給ライン１３１ａには、蒸気生成部１２０で生成された蒸気が流通する。 The heat exchange steam supply line 130a includes one main steam supply line 131a and a plurality of secondary steam supply lines 132a.
The main steam supply line 131a is disposed across the plurality of heat exchangers 140a. In other words, the main steam supply line 131a is disposed as a common line to the plurality of heat exchangers 140a. The upstream end of the main steam supply line 131 a is connected to the steam generation unit 120. The steam generated by the steam generation unit 120 flows through the main steam supply line 131a.
　複数の副蒸気供給ライン１３２ａのそれぞれは、熱交換器１４０ａに対応して配置され、上流側の端部が主蒸気供給ライン１３１ａに接続される。複数の副蒸気供給ライン１３２ａのそれぞれの下流側の端部は、熱交換器１４０ａに接続される。即ち、副蒸気供給ライン１３２ａは、熱交換器１４０ａと一対に設けられる。 Each of the plurality of secondary steam supply lines 132a is disposed corresponding to the heat exchanger 140a, and the upstream end is connected to the main steam supply line 131a. The downstream end of each of the plurality of secondary steam supply lines 132a is connected to the heat exchanger 140a. That is, the auxiliary steam supply line 132a is provided in a pair with the heat exchanger 140a.
　復水ライン１５０は、複数の副復水ライン１５１ａと、１つの主復水ライン１５２ａと、を備える。
　複数の副復水ライン１５１ａの上流側の端部は、熱交換器１４０ａにそれぞれ接続される。複数の副復水ライン１５１ａのそれぞれの下流側の端部は、主復水ライン１５２ａに接続される。即ち、副復水ライン１５１ａは、熱交換器１４０ａと一対に設けられる。副復水ライン１５１ａには、熱交換器１４０ａから排出される復水が流通する。 The condensate line 150 includes a plurality of secondary condensate lines 151a and one main condensate line 152a.
The upstream ends of the plurality of secondary condensate lines 151a are respectively connected to the heat exchanger 140a. The downstream end of each of the plurality of secondary condensing lines 151a is connected to the main condensing line 152a. That is, the auxiliary condensing line 151a is provided in a pair with the heat exchanger 140a. The condensed water discharged from the heat exchanger 140a flows through the auxiliary condensed water line 151a.
　ポンプ１６０ａのそれぞれは、復水ライン１５０ａに配置される。具体的には、ポンプ１６０ａのそれぞれは、副復水ライン１５１ａに配置される。即ち、ポンプ１６０ａは、熱交換器１４０ａと一対に設けられる。ポンプ１６０ａは、熱交換器１４０ａから排出された復水を加圧して、蒸気生成部１２０に送る。 Each of the pumps 160a is disposed in the condensate line 150a. Specifically, each of the pumps 160a is disposed in the secondary condensate line 151a. That is, the pump 160a is provided in a pair with the heat exchanger 140a. The pump 160 a pressurizes the condensate discharged from the heat exchanger 140 a and sends it to the steam generation unit 120.
　流通弁１９０は、復水ライン１５０に配置される。具体的には、流通弁１９０のそれぞれは、副復水ライン１５１ａに配置され、ポンプ１６０ａよりも下流側に配置される。即ち、流通弁１９０は、熱交換器１４０ａ及びポンプ１６０ａと一対に配置される。流通弁１９０は、副復水ライン１５１ａを開閉して、熱交換器１４０ａから主復水ライン１５２ａへの復水の流入を制御する。換言すると、複数の流通弁１９０のそれぞれは、熱交換用蒸気供給ライン１３０ａ（副蒸気供給ライン１３２ａ）から熱交換器１４０ａへの蒸気の供給を制御する。具体的には、流通弁１９０は、熱交換用蒸気供給ライン１３０ａから熱交換器への蒸気の供給流量をそれぞれ制御する。例えば、流通弁１９０は、一つの熱交換器１４０ａに１０ｔ／ｈの蒸気を供給するように制御し、他の一つの熱交換器１４０ａに２０ｔ／ｈの蒸気を供給するように制御する。 The flow valve 190 is disposed in the condensate line 150. Specifically, each of the flow valves 190 is disposed in the secondary condensate line 151a, and is disposed downstream of the pump 160a. That is, the flow valve 190 is disposed in a pair with the heat exchanger 140a and the pump 160a. The flow valve 190 opens and closes the secondary condensing line 151a to control the inflow of condensing water from the heat exchanger 140a to the primary condensing line 152a. In other words, each of the plurality of flow valves 190 controls the supply of steam from the heat exchange steam supply line 130a (the secondary steam supply line 132a) to the heat exchanger 140a. Specifically, the flow valve 190 controls the supply flow rate of steam from the heat exchange steam supply line 130a to the heat exchanger. For example, the flow control valve 190 controls to supply 10 t / h of steam to one heat exchanger 140a, and controls to supply 20 t / h of steam to another heat exchanger 140a.
　主復水ライン１５２ａは、下流側の端部が蒸気生成部１２０に接続される。主復水ライン１５２ａには、複数の副復水ライン１５１ａから流入した復水が流通する。 The downstream end of the main condensate line 152 a is connected to the steam generator 120. Condensed water that has flowed in from the plurality of sub-condensing lines 151 a flows through the main condensing line 152 a.
　ポンプ１６０ａは、複数の副復水ライン１５１ａのそれぞれに配置される。ポンプ１６０ａは、熱交換器１４０ａから排出された復水を加圧して、蒸気生成部１２０に送る。 The pump 160a is arrange | positioned at each of the some secondary condensed water line 151a. The pump 160 a pressurizes the condensate discharged from the heat exchanger 140 a and sends it to the steam generation unit 120.
　次に、本実施形態に係る発電補助システム１００ａ及び火力発電プラント１の動作を説明する。
　まず、蒸気生成部１２０で生成された蒸気を用いてバイパスライン１１０ａを流通する水を予熱する動作について説明する。
　蒸気生成部１２０において、再生可能エネルギーに由来する熱を用いて蒸気が生成される。蒸気生成部１２０で生成された蒸気は、主蒸気供給ライン１３１ａを流通して、複数の副蒸気供給ライン１３２ａに分岐する。分岐した蒸気は、それぞれの熱交換器１４０ａに供給される。 Next, operations of the power generation assistance system 100a and the thermal power plant 1 according to the present embodiment will be described.
First, an operation of preheating water flowing through the bypass line 110 a using the steam generated by the steam generation unit 120 will be described.
In the steam generation unit 120, steam is generated using heat derived from renewable energy. The steam generated by the steam generation unit 120 flows through the main steam supply line 131a and branches into a plurality of secondary steam supply lines 132a. The branched steam is supplied to each heat exchanger 140a.
　それぞれの熱交換器１４０ａに供給された蒸気は、熱交換器１４０ａの内部に導入される。熱交換器１４０ａの内部に導入された蒸気は、バイパスライン１１０ａを流通する水との間で熱交換して冷却される。冷却された蒸気は、復水（ドレン水）となり、それぞれの熱交換器１４０ａから副復水ライン１５１ａに排出される。副復水ライン１５１ａに排出された復水は、それぞれのポンプ１６０ａにより加圧され、主復水ライン１５２ａに流入する。主復水ライン１５２ａで合流した復水は、蒸気生成部１２０に還流する。 The steam supplied to each heat exchanger 140a is introduced into the inside of the heat exchanger 140a. The steam introduced into the heat exchanger 140a exchanges heat with water flowing through the bypass line 110a to be cooled. The cooled steam becomes condensed water (drain water), and is discharged from the respective heat exchangers 140 a to the auxiliary water condensing line 151 a. The condensate discharged to the secondary condensate line 151a is pressurized by the respective pumps 160a and flows into the primary condensate line 152a. The condensed water joined at the main condensed water line 152a is returned to the steam generation unit 120.
　次に、入口弁１７０ａ、出口弁１８０ａ、ポンプ１６０ａ、及び流通弁１９０の動作について説明する。
　複数のバイパスライン１１０ａのそれぞれに配置された入口弁１７０ａ及び出口弁１８０ａが開放されることで、複数の発電設備１０のそれぞれの給水ライン１６からバイパスライン１１０ａに水が受入される。また、流通弁１９０のそれぞれが開放され、ポンプ１６０ａのそれぞれが動作することで、副蒸気供給ライン１３２ａを流通する蒸気が熱交換器１４０ａに導入される。バイパスライン１１０ａを流通する水は、バイパスライン１１０ａごとに配置された熱交換器１４０ａを通って予熱され、それぞれの発電設備１０の給水ライン１６に払出される。 Next, operations of the inlet valve 170a, the outlet valve 180a, the pump 160a, and the flow valve 190 will be described.
By opening the inlet valve 170a and the outlet valve 180a arranged in each of the plurality of bypass lines 110a, water is received from the water supply line 16 of each of the plurality of power generation facilities 10 into the bypass line 110a. Further, the flow valves 190 are opened and the pumps 160a are operated, whereby the steam flowing through the auxiliary steam supply line 132a is introduced into the heat exchanger 140a. The water flowing through the bypass line 110a is preheated through the heat exchangers 140a arranged for each bypass line 110a, and is discharged to the water supply line 16 of each power generation facility 10.
　複数の発電設備１０のうち、１台が点検等により停止される場合、停止される発電設備１０に接続されたバイパスライン１１０ａの入口弁１７０ａ及び出口弁１８０ａが閉止される。これにより、停止される発電設備１０の給水ライン１６からバイパスライン１１０ａへの水の受入が停止される。また、受入が停止されたバイパスライン１１０ａを流通する水を予熱する熱交換器１４０ａへの蒸気の供給も停止される。具体的には、熱交換器１４０ａに接続されている副復水ライン１５１ａに配置された流通弁１９０が閉止され蒸気の供給が停止される。なお，閉止された流通弁１９０が配置されている副復水ライン１５１ａと同じ副復水ライン１５１ａに配置されたポンプ１６０ａの動作も停止される。以上により、停止される発電設備１０の給水ライン１６からバイパスライン１１０ａへの水の受入及び払出が停止する一方、他の発電設備１０からバイパスライン１１０ａへの水の受入及び払出は継続される。また、複数台が点検等により停止する場合であっても、他の発電設備１０の給水ライン１６からバイパスライン１１０ａへの水の受入及び払出が継続される。 When one of the plurality of power generation facilities 10 is stopped due to inspection or the like, the inlet valve 170 a and the outlet valve 180 a of the bypass line 110 a connected to the power generation facility 10 to be stopped are closed. Thereby, reception of water from the water supply line 16 of the power generation facility 10 to be stopped to the bypass line 110a is stopped. Also, the supply of steam to the heat exchanger 140a for preheating the water flowing through the bypass line 110a whose reception has been stopped is also stopped. Specifically, the flow valve 190 disposed in the secondary condensate line 151a connected to the heat exchanger 140a is closed to stop the supply of steam. The operation of the pump 160a disposed in the same secondary condensate line 151a as the secondary condensate line 151a in which the closed flow valve 190 is disposed is also stopped. By the above, reception and discharge of water from the water supply line 16 of the power generation facility 10 to be stopped to the bypass line 110a are stopped, while reception and discharge of water from the other power generation facility 10 to the bypass line 110a is continued. In addition, even when a plurality of units stop due to inspection or the like, the reception and the discharge of water from the water supply line 16 of the other power generation facility 10 to the bypass line 110a are continued.
　以上のような第２実施形態に係る発電補助システム１００ａ及び火力発電プラント１によれば、上記（１）の効果に加え、以下の効果を奏する。 According to the power generation assistance system 100a and the thermal power plant 1 according to the second embodiment as described above, in addition to the effect of the above (1), the following effects can be obtained.
（５）機構を、熱交換用蒸気供給ラインから熱交換器への蒸気の供給量をそれぞれ制御するように構成した。これにより、熱交換器１４０ａのそれぞれに供給される蒸気量を異ならせることができる。従って、バイパスライン１１０を流通する水の量や、予熱に必要な熱量等に応じて熱交換器１４０ａごとに適切な蒸気量を供給することができる。 (5) The mechanism is configured to control the amount of steam supplied from the heat exchange steam supply line to the heat exchanger. Thereby, the amount of steam supplied to each of the heat exchangers 140a can be made different. Therefore, an appropriate amount of steam can be supplied to each heat exchanger 140a according to the amount of water flowing through the bypass line 110, the amount of heat required for preheating, and the like.
（６）バイパスライン１１０ａを、複数の発電設備１０ごとに複数設け、熱交換器１４０ａを、バイパスライン１１０ａごとに複数設けた。これにより、バイパスライン１１０ａや熱交換器１４０ａの一部を点検等により停止したとしても、他のバイパスライン１１０ａや熱交換器１４０ａを用いて他の発電設備１０に供給される水を予熱することができるので、発電効率を向上することができる。また、冗長性が高まるので、信頼性を向上できる。 (6) A plurality of bypass lines 110a are provided for each of the plurality of power generation facilities 10, and a plurality of heat exchangers 140a are provided for each of the bypass lines 110a. Thereby, even if the bypass line 110a or a part of the heat exchanger 140a is stopped by inspection or the like, the water supplied to the other power generation facility 10 is preheated using the other bypass line 110a or the heat exchanger 140a. Power generation efficiency can be improved. In addition, since the redundancy is increased, the reliability can be improved.
（７）発電補助システム１００ａを更に、熱交換用蒸気供給ライン１３０ａから熱交換器１４０ａへの蒸気の供給をそれぞれ制御する流通弁１９０を含んで構成した。また、熱交換用蒸気供給ライン１３０ａを、複数の熱交換器１４０ａに跨って配置される主蒸気供給ライン１３１ａと、主蒸気供給ライン１３１ａと熱交換器１４０ａとを接続する副蒸気供給ライン１３２ａと、を含んで構成した。主蒸気供給ライン１３１ａから副蒸気供給ライン１３２ａを介して、複数の熱交換器１４０ａに蒸気を供給することができる。また、流通弁１９０を開閉することで、熱交換器１４０ａのそれぞれへの蒸気の供給を制御することができる。従って、発電設備１０の運転状況に応じて熱交換器１４０ａへの蒸気の供給を切り換えることができるので、再生エネルギーに由来する熱を効率的に用いることができる。 (7) The power generation assistance system 100a further includes a flow valve 190 that controls the supply of steam from the heat exchange steam supply line 130a to the heat exchanger 140a. Further, a main steam supply line 131a disposed across the plurality of heat exchangers 140a, a secondary steam supply line 132a connecting the main steam supply line 131a and the heat exchanger 140a, and a heat exchange steam supply line 130a. And included. Steam can be supplied from the main steam supply line 131a to the plurality of heat exchangers 140a via the secondary steam supply line 132a. Further, the supply of steam to each of the heat exchangers 140a can be controlled by opening and closing the flow valve 190. Therefore, since the supply of steam to the heat exchanger 140a can be switched according to the operating condition of the power generation facility 10, the heat derived from the regenerated energy can be used efficiently.
　以上、本発明の発電補助システム及び火力発電プラントの好ましい各実施形態につき説明したが、本発明は、上述の実施形態に制限されるものではなく、適宜変更が可能である。 As mentioned above, although demonstrated per preferable embodiment of the power generation auxiliary | assistant system of this invention, and a thermal-power-generation plant, this invention is not restrict | limited to the above-mentioned embodiment, It can change suitably.
　例えば、第１実施形態において、熱交換器１４０を１つとしたが、これに制限されない。例えば、熱交換器１４０が複数設けられ、熱交換用ライン１１１が複数の熱交換器１４０を通るように配置されてもよい。これにより、一部の熱交換器１４０をメンテナンス等で停止したとしても、発電補助システム１００を継続して動作させることができる。従って、発電補助システム１００の設備利用率を向上することができる。また、熱交換用ライン１１１、熱交換用蒸気供給ライン１３０、及び復水ライン１５０の少なくとも１つを複数ライン（系統）として、冗長性を高めるようにしてもよい。
　また例えば，熱交換を行う温度域毎に複数の熱交換器を使い分けても良い。各温度においてコストミニマムな材料を、それぞれ選定する事で、より低価格なシステムとすることができる。 For example, in the first embodiment, one heat exchanger 140 is used, but the invention is not limited thereto. For example, a plurality of heat exchangers 140 may be provided, and the heat exchange lines 111 may be disposed to pass through the plurality of heat exchangers 140. As a result, even if some of the heat exchangers 140 are stopped for maintenance or the like, the auxiliary power generation system 100 can be operated continuously. Therefore, the equipment utilization factor of the power generation assistance system 100 can be improved. Further, redundancy may be enhanced by setting at least one of the heat exchange line 111, the heat exchange steam supply line 130, and the condensate line 150 as a plurality of lines (systems).
Further, for example, a plurality of heat exchangers may be used properly for each temperature range in which heat exchange is performed. By selecting materials that are cost minimal at each temperature, a lower cost system can be obtained.
　また、第２実施形態において、発電設備１０の給水ライン１６をバイパスするバイパスライン１１０ａを各発電設備１０に個別に設けることとしたが、第１実施形態の熱交換器１４０を通る１つの熱交換用ライン１１１を，第２実施形態における複数の熱交換器１４０ａに跨って設け，複数の前記発電設備１０のバイパスライン１１０ａを，複数の熱交換器１４０ａへ接続しても良い。即ち、発電設備１０の給水ライン１６をバイパスするバイパスライン１１０ａを各発電設備１０に個別に設けることにしたが、これに制限されない。例えば、複数設けられる熱交換器１４０ａに対して、第１実施形態の１つの熱交換用ライン１１１を採用してもよい。この場合、１つの熱交換用ライン１１１は、複数の熱交換器１４０に跨って配置され、複数の熱交換器１４０ａを通るように設けられて良い。そして、各発電設備１０（のバイパスライン１１０ａ）は、１つの熱交換用ライン１１１に接続されて良い。
　また、主蒸気供給ライン１３１ａを１つとしたが、これに制限されない。例えば、主蒸気供給ライン１３１ａを複数系統にして、冗長性を高めるようにしてもよい。また、主復水ライン１５２ａを複数系統にして、冗長性を高めるようにしてもよい。 Further, in the second embodiment, the bypass line 110a bypassing the water supply line 16 of the power generation facility 10 is separately provided in each power generation facility 10. However, one heat exchange passing through the heat exchanger 140 of the first embodiment The line 111 may be provided across the plurality of heat exchangers 140a in the second embodiment, and the bypass lines 110a of the plurality of power generation facilities 10 may be connected to the plurality of heat exchangers 140a. That is, although the bypass line 110a bypassing the water supply line 16 of the power generation facility 10 is separately provided in each power generation facility 10, the present invention is not limited thereto. For example, one heat exchange line 111 of the first embodiment may be employed for a plurality of heat exchangers 140a. In this case, one heat exchange line 111 may be disposed across the plurality of heat exchangers 140 and may be provided to pass through the plurality of heat exchangers 140 a. And each power generation facility 10 (bypass line 110a) may be connected to one heat exchange line 111.
Moreover, although the main steam supply line 131a was one, it is not restrict | limited to this. For example, a plurality of main steam supply lines 131a may be provided to enhance redundancy. Also, redundancy may be enhanced by providing a plurality of main condensate lines 152a.
　また、上記各実施形態において、入口弁１７０及び出口弁１８０の開閉について、停止する発電設備１０に対応する入口弁１７０及び出口弁１８０を閉止することとしたが、これに制限されない。発電設備１０のそれぞれが許容可能な熱エネルギーと、発電補助システム１００，１００ａが提供可能な熱エネルギーとに応じて、閉止又は開放する入口弁１７０及び出口弁１８０を決定してもよい。例えば、複数の発電設備１０のうち、許容可能な熱エネルギーが大きい発電設備１０の入口弁１７０及び出口弁１８０を開放し、許容可能な熱エネルギーの小さい発電設備１０の入口弁１７０及び出口弁１８０を閉止してもよい。これにより、火力発電プラント１全体の熱効率を向上することができる。 Further, in the above embodiments, the inlet valve 170 and the outlet valve 180 corresponding to the power generation facility 10 to be stopped are closed for opening and closing the inlet valve 170 and the outlet valve 180, but the invention is not limited thereto. The inlet valve 170 and the outlet valve 180 may be determined to be closed or opened according to the thermal energy that each of the power generation facilities 10 can accept and the thermal energy that can be provided by the power generation assistance system 100, 100a. For example, among the plurality of power generation facilities 10, the inlet valve 170 and the outlet valve 180 of the power generation facility 10 having large allowable thermal energy are opened, and the inlet valve 170 and the outlet valve 180 of the small power generation facility 10 having acceptable thermal energy. May be closed. Thereby, the thermal efficiency of the thermal power plant 1 whole can be improved.
　また、上記各実施形態において、入口弁１７０は、複数の発電設備１０のそれぞれからバイパスライン１１０へ受入する水の流量を制御してもよい。また、出口弁１８０は、複数のバイパスライン１１０から発電設備１０のそれぞれへ払出する水の流量を制御してもよい。具体的には、入口弁１７０は、発電設備１０のそれぞれから異なる量の水を受入するように制御されてよく、出口弁１８０は、発電設備１０のそれぞれに異なる量の水を払出すように制御されてよい。例えば、入口弁１７０は、一つの発電設備１０から２０ｔ／ｈの水を受入するように制御され、他の一つの発電設備１０から５ｔ／ｈの水を受入するように制御されてもよい。また、出口弁１８０は、一つの発電設備１０に２０ｔ／ｈの水を払出すように制御され、他の一つの発電設備１０に５ｔ／ｈの水を払出すように制御されてよい。これにより、発電設備１０ごとに、バイパスライン１１０を流通する水の量を変化させることができ、発電設備１０ごとの状況に即した制御を実現することができる。 In each of the above embodiments, the inlet valve 170 may control the flow rate of water received from each of the plurality of power generation facilities 10 to the bypass line 110. In addition, the outlet valve 180 may control the flow rate of water discharged from each of the plurality of bypass lines 110 to each of the power generation facilities 10. Specifically, the inlet valves 170 may be controlled to receive different amounts of water from each of the power generation facilities 10, and the outlet valves 180 may dispense different amounts of water to each of the power generation facilities 10. It may be controlled. For example, the inlet valve 170 may be controlled to receive 20 t / h of water from one power generation facility 10 and may be controlled to receive 5 t / h of water from another power generation facility 10. Further, the outlet valve 180 may be controlled to dispense 20 t / h of water to one power generation facility 10 and may be controlled to dispense 5 t / h of water to another power generation facility 10. As a result, the amount of water flowing through the bypass line 110 can be changed for each power generation facility 10, and control in line with the situation for each power generation facility 10 can be realized.
　１　火力発電プラント
　１０　発電設備
　１１　ボイラ
　１３　タービン
　１６　給水ライン
　１００，１００ａ　発電補助システム
　１１０，１１０ａ　バイパスライン
　１１１　熱交換用ライン
　１１２　受入ライン
　１１３　払出ライン
　１２０　蒸気生成部
　１３０，１３０ａ　熱交換用蒸気供給ライン
　１３１ａ　主蒸気供給ライン
　１３２ａ　副蒸気供給ライン
　１４０，１４０ａ　熱交換器
　１７０，１７０ａ　入口弁
　１８０，１８０ａ　出口弁
　１９０　流通弁 DESCRIPTION OF SYMBOLS 1 thermal power plant 10 power generation facility 11 boiler 13 turbine 16 water supply line 100, 100a power generation auxiliary system 110, 110a bypass line 111 heat exchange line 112 reception line 113 discharge line 120 steam generation unit 130, 130a heat exchange steam supply line 131a Main steam supply line 132a Secondary steam supply line 140, 140a Heat exchanger 170, 170a Inlet valve 180, 180a Outlet valve 190 Flow valve

Claims (12)

  1. 　化石燃料を燃焼させて蒸気を生成するボイラからタービンに蒸気を供給して発電する発電設備を複数有する火力発電プラントに配置され、前記発電設備による発電を補助する発電補助システムであって、
    　複数の前記発電設備のタービンからボイラに接続される給水ラインのそれぞれに接続され、給水ラインをバイパスするバイパスラインと、
    　再生可能エネルギーに由来する熱を用いて蒸気を生成する蒸気生成部と、
    　前記蒸気生成部から供給される蒸気が流通する熱交換用蒸気供給ラインと、
    　前記熱交換用蒸気供給ラインに接続され、前記熱交換用蒸気供給ラインから導入される蒸気を用いて前記バイパスラインを流通する水を予熱する熱交換器と、
    を備える発電補助システム。     A power generation assistance system disposed in a thermal power plant having a plurality of power generation facilities for generating steam from a boiler that produces fossil fuel by burning fossil fuel and generating steam, and assisting power generation by the power generation facility,
    A bypass line connected to each of a plurality of water supply lines connected from the turbines of the power generation facility to the boiler and bypassing the water supply line;
    A steam generation unit that generates steam using heat derived from renewable energy;
    A heat exchange steam supply line through which the steam supplied from the steam generation unit flows;
    A heat exchanger connected to the heat exchange steam supply line and preheating water flowing through the bypass line using the steam introduced from the heat exchange steam supply line;
    Power generation assistance system equipped with
  2. 　前記バイパスラインは、
    　複数の前記発電設備に跨って配置され、前記熱交換器を通る１つの熱交換用ラインと、
    　複数の前記発電設備ごとに設けられ、前記熱交換用ラインの上流側と給水ラインの上流側とを接続する受入ラインと、
    　複数の前記発電設備ごとに設けられ、前記熱交換用ラインの下流側と給水ラインの下流側とを接続する払出ラインと、
    を備える請求項１に記載の発電補助システム。     The bypass line is
    One heat exchange line disposed across the plurality of power generation facilities and passing through the heat exchanger;
    A receiving line provided for each of the plurality of power generation facilities and connecting the upstream side of the heat exchange line and the upstream side of the water supply line;
    A discharge line provided for each of the plurality of power generation facilities and connecting the downstream side of the heat exchange line and the downstream side of the water supply line;
    The power generation assistance system according to claim 1 comprising:
  3. 　前記バイパスラインは、複数の前記発電設備ごとに複数設けられ、
    　前記熱交換器は、前記バイパスラインごとに複数設けられる請求項１に記載の発電補助システム。     A plurality of bypass lines are provided for each of the plurality of power generation facilities,
    The power generation assist system according to claim 1, wherein a plurality of the heat exchangers are provided for each of the bypass lines.
  4. 　前記熱交換器は複数設けられ、
    　１つの前記熱交換用ラインは、複数の前記熱交換器に跨って配置される請求項２に記載の発電補助システム。     A plurality of the heat exchangers are provided,
    The power generation assistance system according to claim 2, wherein one heat exchange line is disposed across a plurality of the heat exchangers.
  5. 　前記熱交換用蒸気供給ラインから前記熱交換器への蒸気の供給をそれぞれ制御する機構を更に備え、
    　前記熱交換用蒸気供給ラインは、
    　複数の前記熱交換器に跨って配置される主蒸気供給ラインと、
    　前記主蒸気供給ラインと前記熱交換器とを接続する副蒸気供給ラインと、
    を備える請求項３又は４に記載の発電補助システム。     The system further comprises a mechanism for controlling the supply of steam from the heat exchange steam supply line to the heat exchanger,
    The heat exchange steam supply line is
    A main steam supply line disposed across the plurality of heat exchangers;
    An auxiliary steam supply line connecting the main steam supply line and the heat exchanger;
    The power generation assistance system according to claim 3 or 4 provided with.
  6. 　前記機構が、前記熱交換用蒸気供給ラインから前記熱交換器への蒸気の供給流量をそれぞれ制御する、請求項５に記載の発電補助システム。 The power generation assistance system according to claim 5, wherein the mechanism respectively controls a supply flow rate of steam from the heat exchange steam supply line to the heat exchanger.
  7. 　複数の前記発電設備ごとに前記熱交換器を挟んで前記バイパスラインの上流側に設けられ、複数の前記発電設備のそれぞれから前記バイパスラインへの受入を制御する入口弁と、
    　複数の前記発電設備ごとに前記熱交換器を挟んで前記バイパスラインの下流側に設けられ、前記バイパスラインから複数の前記発電設備への払出を制御する出口弁と、
    を更に備える請求項１から６のいずれか一項に記載の発電補助システム。     An inlet valve provided upstream of the bypass line across the heat exchanger for each of the plurality of power generation facilities and controlling an acceptance of each of the plurality of power generation facilities to the bypass line;
    An outlet valve provided downstream of the bypass line across the heat exchanger for each of a plurality of the power generation facilities, and controlling discharge from the bypass line to the plurality of the power generation facilities;
    The power generation assistance system according to any one of claims 1 to 6, further comprising:
  8. 　前記出口弁が，前記バイパスラインから複数の前記発電設備のそれぞれへ払出する水の流量を制御する、請求項７に記載の発電補助システム。 The power generation assistance system according to claim 7, wherein the outlet valve controls a flow rate of water discharged from the bypass line to each of the plurality of power generation facilities.
  9. 　前記入口弁が，複数の前記発電設備のそれぞれから前記バイパスラインへ受入する水の流量を制御する、請求項７又は８に記載の発電補助システム。 The power generation assistance system according to claim 7, wherein the inlet valve controls a flow rate of water received from each of the plurality of power generation facilities to the bypass line.
  10. 　前記入口弁及び前記出口弁は、対応する前記発電設備の運転状況に応じて開閉される、請求項７から９のいずれか一項に記載の発電補助システム。 The power generation assistance system according to any one of claims 7 to 9, wherein the inlet valve and the outlet valve are opened and closed according to the operating condition of the corresponding power generation facility.
  11. 　上流側が前記熱交換器に接続され、下流側が前記蒸気生成部に接続され、前記バイパスラインを流通する水を予熱した蒸気の復水を流通する復水ラインと、
    　前記熱交換器と再生可能エネルギーに由来する熱を用いて蒸気を生成する前記蒸気生成部との間の前記復水ラインに配置されるポンプと、
    を更に備える請求項１から１０のいずれか一項に記載の発電補助システム。     An upstream side connected to the heat exchanger, a downstream side connected to the steam generation unit, and a condensate line for circulating condensate of steam preheated water flowing through the bypass line;
    A pump disposed in the condensate line between the heat exchanger and the steam generating unit that generates steam using heat derived from renewable energy;
    The power generation assistance system according to any one of claims 1 to 10, further comprising:
  12. 　請求項１から１１のいずれか一項に記載の発電補助システムと、
    　前記発電補助システムに接続される複数の発電設備と、
    を備える火力発電プラント。     The power generation assistance system according to any one of claims 1 to 11,
    A plurality of power generation facilities connected to the power generation assistance system;
    Thermal power plant equipped with
PCT/JP2017/033027 2017-09-13 2017-09-13 Auxiliary power generation system and thermal power plant WO2019053803A1 (en)

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