CN-224214236-U - Elastic heat recovery system with steam supplementing valve under deep peak regulation of steam turbine

CN224214236UCN 224214236 UCN224214236 UCN 224214236UCN-224214236-U

Abstract

The utility model relates to the technical field of thermal power generation, in particular to an elastic regenerative system with a steam supplementing valve under deep peak regulation of a steam turbine, which comprises a deaerator, a preposed pump, a water supply pump, an existing final-stage high-pressure heater, a boiler and a high-pressure cylinder, wherein the deaerator, the preposed pump and the water supply pump are sequentially communicated, a water supply outlet of the water supply pump is communicated with a water supply inlet of the existing final-stage high-pressure heater, a water supply outlet of the existing final-stage high-pressure heater is communicated with a water supply inlet of the boiler, a steam outlet of the boiler is communicated with a steam inlet of the high-pressure cylinder, a steam outlet of the high-pressure cylinder is communicated with a steam inlet of the existing final-stage high-pressure heater, a steam outlet of the high-pressure cylinder is communicated with a steam inlet of the boiler, and an outlet of the main steam valve is communicated with a steam inlet of the boiler. The utility model can improve the fuel utilization rate.

Inventors

GAO HONGFU
TANG YANZHI
ZHAO JIE
YIN LIGUO
FENG YUWEI
HUANG TAIMING
QIU GUOMIN
BIAN RUIMING
Zong Yuezhuo
ZHU YONGQIAN

Assignees

华润电力(锡林郭勒)有限公司

Dates

Publication Date: 20260508
Application Date: 20250527

Claims (10)

1. The utility model provides an elastic backheating system under steam turbine degree of depth peak shaving of area steam compensating valve, includes deaerator (1), pre-pump (2), water feeding pump (3), current final-stage high pressure heater (4), boiler (5), high pressure cylinder (6), wherein, deaerator (1), pre-pump (2), water feeding pump (3) communicate in proper order, water feeding pump (3) water feeding export with current final-stage high pressure heater (4) water feeding entry intercommunication, current final-stage high pressure heater (4) water feeding export with boiler (5) water feeding entry intercommunication, boiler (5) steam outlet with high pressure cylinder (6) steam inlet intercommunication, high pressure cylinder (6) steam inlet with current final-stage high pressure heater (4) steam inlet intercommunication, characterized by still includes main valve (7), steam compensating valve (8), hot secondary air heater (9), main valve (7) with the parallel arrangement of compensating valve (8), and both inlets and boiler (5) steam outlet with high pressure cylinder (6) steam inlet intercommunication, high pressure cylinder (6) steam outlet and high pressure cylinder (8) steam inlet intercommunication, and the steam outlet of the hot overgrate air heater (9) is communicated with the steam inlet of the boiler (5).
2. The elastic backheating system under deep peak shaving of steam turbine with steam supplementing valve according to claim 1, further comprising a power generation controller, wherein the power generation controller is respectively in communication connection with the main steam valve (7) and the steam supplementing valve (8).
3. The elastic backheating system under deep peak shaving of a steam turbine with a steam supplementing valve according to claim 1 or 2, further comprising a newly added final-stage high-pressure heater (10), wherein a steam outlet of the hot overgrate air heater (9) is also communicated with a steam inlet of the newly added final-stage high-pressure heater (10), a water supply outlet of the newly added final-stage high-pressure heater (10) is communicated with a water supply inlet of the boiler (5), and a water supply inlet of the newly added final-stage high-pressure heater (10) is communicated with a water supply outlet of the existing final-stage high-pressure heater (4).
4. The elastic heat recovery system under deep peak shaving of steam turbine with steam supplementing valve according to claim 3, further comprising a low pressure cylinder (11), a condenser (12) and a thermal well (13) which are sequentially connected, wherein a water supply inlet of the newly added final-stage high-pressure heater (10) is further communicated with the condenser (12), and the thermal well (13) is communicated with the deaerator (1).
5. The elastic backheating system under deep peak shaving of the steam turbine with the steam supplementing valve according to claim 4, wherein a water level regulating valve is further arranged in the newly added last-stage high-pressure heater (10).
6. The elastic backheating system with steam supplementing valve under deep peaking according to claim 1, wherein the water supply outlet of the water supply pump (3) is also communicated with the water supply inlet of the deaerator (1).
7. The elastic backheating system with steam supplementing valve under deep peaking of steam turbine according to claim 1, further comprising a hot primary air heater (14), wherein the steam extraction port of the high-pressure cylinder (6) is communicated with the steam inlet of the hot primary air heater (14), and the steam outlet of the hot primary air heater (14) is communicated with the steam inlet of the existing final-stage high-pressure heater (4).
8. The elastic backheating system with steam compensating valve under deep peaking according to claim 7, further comprising a medium pressure cylinder (15), wherein the steam extraction port of the high pressure cylinder (6) is communicated with the steam inlet of the medium pressure cylinder (15), and the steam outlet of the medium pressure cylinder (15) is communicated with the steam inlet of the hot primary air heater (14).
9. The elastic backheating system under deep peak shaving of steam turbine with steam compensating valve according to claim 3, wherein the existing final-stage high-pressure heater (4) comprises a No. 1 high-pressure heater (41), a No. 2 high-pressure heater (42) and a No. 3 high-pressure heater (43) which are communicated sequentially through pipelines, a water supply outlet of the No. 1 high-pressure heater (41) is communicated with a water supply inlet of the newly added final-stage high-pressure heater (10), and a water supply inlet of the No. 3 high-pressure heater (43) is communicated with a water supply outlet of the water supply pump (3).
10. The elastic heat recovery system under deep peak shaving of the steam turbine with the steam supplementing valve according to claim 1, wherein the boiler (5) comprises an economizer (51), a water cooling wall (52) and a superheater (53), and the economizer (51), the water cooling wall (52) and the superheater (53) are sequentially connected through pipelines.

Description

Elastic heat recovery system with steam supplementing valve under deep peak regulation of steam turbine Technical Field The utility model relates to the technical field of thermal power generation, in particular to an elastic heat recovery system with a steam supplementing valve under deep peak regulation of a steam turbine. Background Thermal power generation is a power generation mode in which chemical energy in fuel is converted into heat energy by burning fossil fuel (such as coal, petroleum and natural gas) or biomass fuel, and then a power generator is driven by a thermodynamic cycle system (such as a steam turbine and a gas turbine) to generate electric energy. The thermal efficiency of the existing thermal power generation system is lower, the carbon conversion is incomplete, the thermal efficiency of a conventional coal-fired power plant is usually 30% -40%, which means that about 60% -70% of fuel energy is dissipated in the form of waste heat and is not converted into electric energy. Disclosure of utility model The utility model aims to overcome the defect of low thermal efficiency of the traditional thermal power generation system, and provides an elastic heat recovery system with a steam supplementing valve under deep peak regulation of a steam turbine, which can improve the fuel utilization rate, save energy and improve the thermal efficiency. In order to solve the technical problems, the utility model adopts the following technical scheme: The utility model provides an elasticity heat recovery system under high-pressure steam turbine degree of depth peak shaving of area make-up valve, includes deaerator, pre-pump, feed pump, current final-stage high-pressure heater, boiler, high-pressure cylinder, wherein, deaerator, pre-pump, feed pump communicate in proper order, feed pump water outlet with current final-stage high-pressure heater water inlet intercommunication, current final-stage high-pressure heater water outlet with boiler water inlet intercommunication, boiler steam outlet with high-pressure cylinder steam inlet intercommunication, high-pressure cylinder steam outlet with current final-stage high-pressure heater steam inlet intercommunication, still include main steam valve, make-up valve, hot overgrate air heater, main steam valve with the make-up valve parallelly connected sets up, and both's entry all with boiler steam outlet intercommunication, main steam valve's export with high-pressure cylinder steam inlet intercommunication, make-up valve's export and high-pressure cylinder water outlet all with hot overgrate air heater inlet intercommunication, hot overgrate air heater steam outlet intercommunication with boiler steam inlet. The elastic heat recovery system with the steam supplementing valve under the deep peak regulation of the steam turbine is coupled with the tail flue gas waste heat of the boiler through the steam supplementing valve to carry out secondary utilization, heat is supplied to the hot secondary air heater, the temperature of the hot secondary air is improved, the combustion efficiency is optimized, the temperature of the hot secondary air is stably maintained in a designed threshold interval, the loss rate of a cold source is reduced by 15% -25%, the frequency modulation dynamic performance index of a unit can be improved, the comprehensive power supply coal consumption is reduced, and the problem of coupling of end difference increase and insufficient frequency modulation capacity of the heat recovery system under the deep peak regulation working condition is effectively solved. Specifically, the high-pressure steam from the tail part of the boiler is regulated through the main steam valve and the steam supplementing valve, so that under the condition that the requirement of the high-pressure cylinder is met, the rest high-temperature high-pressure steam directly enters the hot secondary air heater to heat the hot secondary air, and the hot secondary air is heated and returned to the boiler, thereby realizing the secondary utilization of waste heat, further improving the fuel utilization rate, saving energy and improving the heat efficiency. Further, the engine control system also comprises an electricity generation amount controller which is respectively in communication connection with the main steam valve and the steam supplementing valve. The proportion control of the main steam valve and the steam supplementing valve is carried out on the high-temperature high-pressure steam from the tail part of the boiler by utilizing the generated energy controller, so that the rest high-temperature high-pressure steam directly enters the boiler hot secondary air heater and is heated by utilizing waste heat under the condition of meeting the generated energy requirement of the high-pressure cylinder, and the automatic control is realized. Further, the boiler water supply system further comprises a newly-increased last-stage high-pressure heater, the steam outlet of the