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

An energy-saving system and back pressure technology, applied in heating systems, hot water central heating systems, household heating, etc. Poor thermal economy and other problems, to achieve the effect of reducing operation and maintenance costs, improving operation economy, and reducing start-up costs

Active Publication Date: 2021-07-27
CHINA ENERGY ENG GRP GUANGDONG ELECTRIC POWER DESIGN INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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

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specific Embodiment 1

[0027] refer to figure 1 The wide-load heating and energy-saving system of the back-pressure small steam turbine driving the induced draft fan shown includes the main steam turbine, the back-pressure small steam turbine 62, the induced draft fan 5, the boiler reheater 4, the deaerator 7 and the low-pressure heater 8, The main steam turbine is equipped with a high-pressure cylinder 1 and a medium-pressure cylinder 2. The exhaust end of the high-pressure cylinder 1 is connected to the steam inlet end of the boiler reheater 4 through a high-temperature exhaust pipe 101, and one of the outlet ends of the boiler reheater 4 is connected to The steam inlet end of the medium-pressure cylinder 2 constitutes a reheat circuit; the second steam outlet end of the boiler reheater 4 is connected to the steam inlet end of the back-pressure small steam turbine 62 through a sub-high temperature steam pipe 111 to form a back-pressure small steam turbine. Heat supply circuit; the power output end...

specific Embodiment 2

[0030] refer to figure 2 As shown, the technical feature of this embodiment is that the water pump 5 is two 50% capacity driven induced draft fans, and the two 50% capacity driven induced draft fans supply water to two back pressure small steam turbines 62 respectively. All the other are with embodiment 1.

specific Embodiment 3

[0032] refer to image 3As shown, the technical features of this embodiment are: the heat supply pipe network 501 communicates with the third exhaust port of the medium-pressure cylinder 2 and the steam inlet end of the low-pressure heater 8 through the steam extraction pipe 201, forming a structure for heating condensed water and The extraction and admission steam structure of the heating circuit. The heat supply pipe network 501 is connected to the steam extraction pipe 203 through a switching pipe 502, and the switching pipe 502 is connected to the heat recovery circuit through the steam extraction pipe 203 to form a low-load high heat recovery balance pipe. The induced draft fan 5 is a 100% capacity driven induced draft fan. The low pressure heater 8 is a 100% capacity heater. All the other are with embodiment 1.

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F24D3/00F22B33/18
Inventor 杨劲郑赟范永春潘灏马雪松李伟科范旭
Owner CHINA ENERGY ENG GRP GUANGDONG ELECTRIC POWER DESIGN INST CO LTD
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