Wide-load heat supply energy saving system of back pressure type small turbine driving induced draft fan

Abstract

The invention relates to a wide-load heat supply energy saving system of a back pressure type small turbine driving induced draft fan. The system comprises a main turbine, a back pressure type small turbine, an induced draft fan, a boiler reheater, a deaerator and a low-pressure heater, wherein a steam discharge end of a high-pressure cylinder in the main turbine is connected with a steam inlet end of the boiler reheater; one of steam outlet ends of the boiler reheater is connected with a steam inlet end of a medium-pressure cylinder to form a reheating loop; the other one of the steam outlet ends of the boiler reheater is connected with a steam inlet end of the back pressure type small turbine to form a heat supply loop; a power output end of the back pressure type small turbine is connected with a driving input end of the induced draft fan to form an induced draft fan driving loop; one of steam discharge ports of the medium-pressure cylinder is connected with a steam inlet end of the deaerator through a heat return steam extracting pipe; the other one of the steam discharge ports of the medium-pressure cylinder is connected with a steam inlet end of the low-pressure heater through a steam extracting pipe to form a heat returning loop; and a steam extracting and replenishing structure of the heat supply loop is formed between all connecting pipelines of the low-pressure heater, a condensed water pipe, the deaerator and the medium-pressure cylinder and a heat supply pipe network. The system improves the heat supply operation economy, and has the advantages of higher operation adjusting flexibility and better heat supply economy.

Description

technical field [0001] The invention relates to a wide-load heat supply and energy-saving system for a back-pressure small steam turbine driving an induced draft fan, which is suitable for heat supply in a thermal power plant. It belongs to the technical field of thermal power generation equipment. Background technique [0002] At present, the application of high-efficiency turbo-generator sets has become the focus of power optimization allocation, while strict energy-saving and emission-reduction indicators require the shutdown of small self-owned power plants and heating boilers of various enterprises, so that large-scale conventional coal-fired power plants need to have both peak-shaving and heating capacity requirements. For the heat supply units of coal-fired conventional thermal power plants, the main thermal systems include reheat system, heat recovery system, heat supply system and induced draft fan system. The reheat system means that the exhaust steam after the h...

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Problems solved by technology

[0007] The purpose of the present invention is to solve the disadvantages of the existing condensing steam turbine driving the induced draft fan, such as the poor economy of steam extraction and heat supply, and the inherent poor flexibility of narrow load operation of the back pressure steam turbine, and the lack of electric load peak regulation capability. Provide a large-capacity thermal power generation unit heating system with high-efficiency wide-load heating and full-load grid peak-shaving capabilities

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