Combined heat and power system for directly recovering exhaust afterheat of power station steam turbine by absorption heat pump

Abstract

The invention relates to a combined heat and power system for directly recovering exhaust afterheat of a power station steam turbine by an absorption heat pump, which is used for recovering the exhaust afterheat of the power station steam turbine. The combined heat and power system comprises a power plant boiler (1), the steam turbine (2), an electric generator (3), a steam turbine exhaust pipe (4), a condenser (5), a cooling tower or an air cooling system (6), a water circulating pump (7), an exhaust condensate pump (8), a steam extraction and water condensation boiler pipe (9), the absorption heat pump (10), a hot water return pipe (11), a hot water outlet pipe (12) and a steam turbine extraction pipe (13), wherein the absorption heat pump (10) comprises a generator (14), a condenser (15), an absorber (16) and an evaporator (17). The combined heat and power system is characterized in that: low-pressure steam pipes discharged by the steam turbine (2) are divided into two paths, wherein one path is connected with the condenser (5) through the steam turbine exhaust pipe (4), while the other path is connected with the evaporator (17) of the absorption heat pump (10) through a steam turbine exhaust evaporator tube (19). The combined heat and power system can more effectively recycle low-grade exhaust condensation heat of a power plant, and reduces the temperature loss, improves the supply water temperature of hot water, and reduces the system investment and operating cost on the premise of not changing the exhaust back pressure.

Description

(1) Technical field [0001] The invention relates to an absorption heat pump system for directly recovering waste heat from exhaust steam of a steam turbine in a power station. It is used to recover the exhaust heat of steam turbines in power stations. (2) Background technology [0002] my country's winter heating, urban central heating, production process central heating and other hot water pipe networks adopt the centralized heating mode of combined heat and power in thermal power plants in many cases. Even in heating conditions, there is still a large amount of low-grade exhaust steam waste heat after steam turbine power generation that cannot be utilized, and is discharged into the atmosphere through circulating water (usually through cooling towers) or air cooling systems, affecting the overall efficiency of energy utilization. [0003] Such as figure 1 As shown, at present, the hot water for central heating generally adopts the medium-pressure steam (generally 0.3-1.0...

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Problems solved by technology

However, this kind of indirect extraction of steam turbine exhaust waste heat through waste water will increase the investment of waste water system (especially for air-cooling systems), the power consumption of water pumps, and the temperature loss caused by heat exchange between exhaust steam and waste water will affect the centralized supply. Unfavorable factors such as hot water temperature rise

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