Coupling peak regulation system based on intermediate exhaust and low-pressure steam extraction cooling and operation method thereof

Abstract

The invention discloses a coupling peak regulation system based on intermediate exhaust and low-pressure steam extraction cooling and an operation method thereof. The coupling peak regulation system comprises a first conventional unit system generator set (13) and a second conventional unit system generator set (14). The first conventional unit system generator set (13) comprises a first medium-pressure cylinder (7), a first low-pressure cylinder (8), a first condensate pump (11), a first low-pressure cylinder steam extraction pipe (19) and a first medium-pressure cylinder steam exhaust control and isolation valve group (1); and the second conventional unit system generator set (14) comprises a second medium-pressure cylinder (9), a second low-pressure cylinder (10), a second condensate pump (12), a second low-pressure cylinder steam extraction pipe (20) and a second medium-pressure cylinder steam exhaust control and isolation valve group (2). According to the operation method, flexible switching between the first conventional unit system generator set (13) and the second conventional unit system generator set (14) is achieved. The deep peak regulation capacity of the unit can be improved without technical transformation on the boiler side, and the operation flexibility of the unit is improved.

Description

technical field [0001] The invention belongs to the technical field of thermal power generation, and in particular relates to a coupled peak regulation system based on middle exhaust and low-pressure steam extraction cooling and an operation method thereof. Background technique [0002] At present, domestic large-capacity thermal power plants widely adopt the unit system operation method, that is, one boiler supplies steam to one steam turbine, and the steam turbine drives the generator to generate electricity, forming an independent power generation unit of boiler-turbine-generator. There is basically no horizontal connection between each power generation unit. Due to the minimum stable combustion output limit of coal-fired boilers without auxiliary fuel, the minimum electrical load of existing thermal power units is generally limited to about 30%-40%, and further reduction will have an adverse effect on the safe and continuous operation of the boiler. Chinese Invention Pa...

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Problems solved by technology

Due to the minimum stable combustion output limit of coal-fired boilers without auxiliary fuel, the minimum electrical load of existing thermal power units is generally limited to about 30%-40%, and further reduction will have an adverse effect on the safe and continuous operation of the boiler

Chinese Invention Patent Publication CN109653810A discloses a thermal system with one furnace and two machines switching operation. By adding superheated steam and reheated steam bypass and control valves, when one boiler fails, the other boiler is used to drive the two boilers. Steam turbine power generation, at this time, the unit has a certain peak-shaving capability, but the system layout is relatively complicated, the operation flexibility is low, and the operability in the actual operation of the power plant is poor

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