Novel bottom-mounted back pressure heat supply steam turbine and operation method thereof

Abstract

The invention discloses a novel bottom-mounted back pressure heat supply steam turbine and an operation method thereof. The novel bottom-mounted back pressure heat supply steam turbine and the operation method thereof are used in a steam extraction heating heat circulation system of a large pure condensing steam turbine unit. A thermal power plant thermal cycle system includes a boiler and a mainsteam turbine unit. A bottom-mounted back pressure heat supply steam turbine unit comprises a small steam turbine, a steam inlet pipe system and a valve, a high pressure cylinder vacuum pump, a steamexhaust pipe system downstream of a high pressure cylinder, a three-way valve, and a small power frequency generator. The thermal power plant thermal cycle system operates at 40% or more of a grid load command, steam enters the high pressure cylinder of the bottom-mounted back pressure heat supply steam turbine, the high pressure cylinder exhausts steam, a low pressure cylinder continues to expandto do work. The thermal power plant thermal cycle system operates at 40% or less of the grid load command, steam intake of the high pressure cylinder of the bottom-mounted back pressure heat supply steam turbine is stopped, steam enters through the lower pressure cylinder, and the high pressure cylinder vacuum pump of the small steam turbine is started. The novel bottom-mounted back pressure heatsupply steam turbine improves efficiency based on a conventional bottom-mounted back pressure heat supply steam turbine, and the energy utilization rate and comprehensive economy of a heat supply system is maximized as much as possible.

Description

technical field [0001] The invention discloses a novel bottom-mounted back-pressure heat supply steam turbine and an operation method thereof, which are used in a large-scale pure condensing steam turbine unit for extracting steam and supplying heat to a thermodynamic cycle system. Background technique [0002] my country's central heating began in the 1990s and has developed rapidly. [0003] Using large-scale pure condensing turbine units to extract steam and replace surrounding small thermal power units for heat supply can not only improve the thermal energy utilization rate of large thermal power units, but also shut down small units with high energy consumption and high pollution, reduce regional coal consumption, and reduce pollution emissions. This has become an important measure for the whole society to control carbon emissions, and promotes the construction of a resource-saving and environment-friendly society. [0004] For the heating power plants that have realiz...

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Problems solved by technology

[0007] In order to make up for the deficiencies in the current operation, solve the problems of unreasonable enthalpy drop distribution of traditional bottom-mounted back pressure heating steam turbines, and low efficiency of small steam turbines under variable operating conditions of the main engine load, and maximize the use of the pressure difference energy of steam extraction to improve The efficiency of small steam turbines

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