Wide-load heating and energy-saving system of back-pressure small steam turbine driven induced draft fan

Abstract

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, including a main steam turbine, a back-pressure small steam turbine, an induced draft fan, a boiler reheater, a deaerator and a low-pressure heater. The exhaust end of the high-pressure cylinder is connected to the steam inlet end of the boiler reheater, and one of the outlet ends of the boiler reheater is connected to the steam inlet end of the medium-pressure cylinder to form a reheat circuit; one of the outlet ends of the boiler reheater 2. Connect the steam inlet end of the back-pressure small steam turbine to form a heating circuit; the power output end of the back-pressure small steam turbine is connected to the drive input end of the induced draft fan to form the drive circuit of the induced draft fan; one of the exhaust ports of the medium-pressure cylinder passes through The regenerative steam extraction pipeline is connected to the steam inlet end of the deaerator, and the second outlet of the medium-pressure cylinder is connected to the steam inlet end of the low-pressure heater through the steam extraction pipeline to form a regenerative circuit; the low-pressure heater, condensate pipeline, The steam extraction and supplementary structure of the heating circuit is formed between the connecting pipelines of the deaerator and the medium-pressure cylinder and the heating pipe network. The invention not only improves the heating operation economy, but also has the advantages of higher operation adjustment flexibility and better heating 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 extracting steam and heat supply, and the inherent narrow load operation flexibility of the back pressure steam turbine, and the lack of electric load peak regulation. Provide a large-capacity thermal power generation unit heating system with high-efficiency wide-load heating and full-load power grid peak-shaving capabilities

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