Thermal power plant black-start power supply and waste heat recycle combined system and application method

Abstract

The invention mainly relates to a thermal power plant black-start power supply and waste heat recycle combined system and an application method. The system comprises a waste heat steam turbine, a waste heat steam turbine generator, a condenser, a condensate water pump, a start-up boiler deaerator, a start-up boiler water feeding pump, a start-up boiler, a low-grade steam pipe net, a chemical desalting device, a sea water desalting device and a fresh water tank; a control valve B is arranged on a steam outlet pipe of the start-up boiler, one path of valve back steam is connected with the sea water desalting device through a control valve A, the other path of the valve back steam sequentially passes through a control valve C and a control valve E to be connected with a steam inlet pipe of the waste heat steam turbine; and a control valve D is arranged on a main pipe of the low-grade steam pipe net, one path of valve back steam is connected with the steam inlet pipe of the waste heat steam turbine, and the other path of valve back steam is connected with the sea water desalting device. According to the thermal power plant black-start power supply and waste heat recycle combined systemand the application method, the black-start power supply problem of a thermal power plant operating through an isolated net is solved, moreover, during normal operation, the surplus low-grade steam can be recycled for sea water desalting treatment and electric energy supply, so that energy waste is reduced, and the environment is protected.

Description

technical field [0001] The invention relates to black start and waste heat recovery and utilization technology of a thermal power plant, and mainly relates to a black start power supply and waste heat recovery and utilization combined system and use method of a thermal power plant. Background technique [0002] For refineries built on isolated islands, it is generally difficult to obtain power from the grid. For these refineries, it is necessary to build self-provided thermal power plants to provide electricity and heat for their production and life. Thermal power plants built under such circumstances cannot be connected to the large power grid and can only operate in isolation. When a thermal power plant operating on an isolated grid is shut down due to circuit failure or other reasons, it needs to be restarted. This kind of startup is called black start. During black start, the reverse power transmission of the large power grid cannot be used to provide starting power for...

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Problems solved by technology

The steam required for seawater desalination generally comes from the low-grade steam pipeline network of the refinery, but seawater desalination may not be able to fully utilize the low-grade steam, and there will be more There is a surplus of low-grade steam, if this part of steam is discharged directly, it will waste energy and pollute the environment

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