Low-temperature afterheat using system and afterheat using method

Abstract

The invention relates to a low-temperature afterheat using system and an afterheat using method. At present, the afterheat using system and the afterheat using method capable meeting requirements of energy-saving and emission reduction, and slightly influencing on the power generation are not existed. The low-temperature afterheat using system is characterized by comprising a 1# low-pressure cylinder, a 2# low-pressure cylinder, a 1# condenser, a 2# condenser, a circular water outlet mother pipe and a hot pump water inlet branch pipe; the 1# low-pressure cylinder is connected with the 1# condenser, and the 2# low-pressure cylinder is connected with the 2# condenser; one end of the hot pump water inlet branch pipe is connected to the circular water outlet mother pipe. The afterheat using method is characterized in that when the outside hot load demand at the beginning and last periods of heat supply is low; according to temperature of circular water entering an absorbing type hot pump, the circular water flow of an upper cooling tower is adjusted through controlling the opening degree of an isolating valve of the circular water outlet mother pipe. The low-temperature afterheat using system can be flexibly arranged and switched at any time, so that the requirements of saving energy and reducing emission are satisfied, and the influence on the power generation amount is small.

Description

technical field [0001] The invention relates to a low-temperature waste heat utilization system and a waste heat utilization method, in particular to a heat network heating system and a waste heat utilization method of a wet-cooling unit thermal power plant, especially suitable for the heat supply of 300MW double low-pressure cylinders which are changed from a pure condensing unit to a heating unit Unit or 600MW class double back pressure condenser heating unit. Background technique [0002] In recent years, with the rapid development of urban central heating on the one hand, and the pressure and assessment upgrade of thermal power plants for energy conservation and emission reduction on the other hand, the use of absorption heat pumps to recover the waste heat of circulating water of steam turbines in thermal power plants has been applied on a large scale. However, the currently used models are basically steam extraction heating units. Absorption heat pump recovery of stea...

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Problems solved by technology

[0005] To sum up, at present there is no 300MW or 600MW dual-low pressure system suitable for pure condensing reform heating supply with reasonable structural design and flexible system settings that can be switched at any time, which not only meets the requirements of energy saving and emission reduction, but also has little impact on power generation Low temperature waste heat utilization system and waste heat utilization method of cylinder condenser heating unit

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