Upgrading and heat supply system for steam turbine exhaust steam waste heat

Abstract

The invention relates to the technical field of heat and power cogeneration, and discloses an upgrading and heat supply system for steam turbine exhaust steam waste heat. The upgrading and heat supplysystem comprises a heat network primary heat supply loop, a steam turbine and a compressor, wherein the heat network primary heat supply loop comprises a first heat exchanger, a second heat exchangerand a third heat exchanger, a primary heating network water outlet of the first heat exchanger communicates with a secondary heating network water inlet of the second heat exchanger, a secondary heating network water outlet of the second heat exchanger communicates with a first water inlet of the third heat exchanger, and a first water outlet of the third heat exchanger communicates with a primary heating network return water inlet of the first heat exchanger; and an exhaust steam outlet of the steam turbine communicates with an exhaust steam inlet of the heat exchanger and an exhaust steam inlet of the compressor, and an exhaust steam outlet of the compressor communicates with an exhaust steam inlet of the second heat exchanger. The upgrading and heat supply system for steam turbine exhaust steam waste heat can achieve effective utilization of all exhaust steam waste heat of the steam turbine under any electric load condition, and has the double advantages of high efficiency and highoperation flexibility of a gradient heat supply system.

Description

technical field [0001] The invention relates to the technical field of cogeneration of heat and power, in particular to a heat supply system for improving quality and supplying waste heat from exhaust steam of a steam turbine. Background technique [0002] With the continuous development of my country's national economy and the rapid upgrading of consumption structure, the demand for primary energy consumption is increasing year by year. In order to change the extensive economic growth mode of "high energy consumption, high emission, uncoordinated, and low efficiency", the Chinese government has taken industrial structure optimization, consumption reduction, and environmental protection as the primary prerequisites for economic development. As the power industry is a large energy consumer, the in-depth research and popularization and application of power station energy saving and emission reduction technologies are particularly important. At present, thermal power generatio...

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Problems solved by technology

[0007] The purpose of the present invention is to provide a steam turbine exhaust waste heat quality-improving heating system to solve the problem that the existing low-level energy heating technology cannot achieve thermoelectric decoupling operation while taking into account the economical operation

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