System for deeply recovering smoke waste heat through absorbing type heat pump and two-stage heat exchanger

Abstract

The invention provides a system for deeply recovering smoke waste heat through an absorbing type heat pump and a two-stage heat exchanger, and belongs to the technical field of recovering and utilizing of smoke waste heat of boilers of thermal power plants. The system comprises a smoke channel, a waste heat recovering tower, the absorbing type heat pump and a heat exchanger; smoke in a reverse flowing type spraying tower is in direct contact with low-temperature spraying water and exchanges heat with the low-temperature spraying water; after temperature increases, the spraying circulating water transfers heat to the cold end of the absorbing type heat pump through a two-stage plate type heat exchanger; heat recovered by the heat pump from the cold is used for heating returned by a primarynet of the hot end under the driving of a driving heat source; and water recovered by a heat supply network is heated to reach the temperature as requirement and then is returned to the heat supply network. Compared with the prior art, the system has the advantages that the absorbing type heat pump is combined with the heat exchanger to recover smoke waste heat, and the smoke exhausting temperature can be decreased to be 20-30 DEG C, and thus the sensible heat and the potential heat in the smoke can be fully utilized; the waste heat recovery rate is high; the system efficiency is improved; andmeanwhile, the system is high in economy, efficiency and environmental protection performance.

Description

Technical field [0001] The invention belongs to the technical field of recovery and utilization of flue gas waste heat of thermal power plant boilers, and particularly relates to a flue gas waste heat deep recovery system adopting an absorption heat pump and a two-stage heat exchanger. Background technique [0002] In recent years, the country has attached great importance to energy conservation and emission reduction. How to improve the thermal efficiency of the boiler and make full use of the waste heat of the boiler flue gas has become one of the research hotspots. At present, most coal-fired thermal power plants adopt low-temperature economizer waste heat recovery technology, which can only recover about 20% of the flue gas waste heat, and a large part of the flue gas's sensible heat and latent heat are not fully utilized. [0003] In order to recover and reuse the flue gas waste heat, if the flue gas waste heat recovery tower is used to spray and condense the low temperature ...

AI Technical Summary

Problems solved by technology

At present, most coal-fired thermal power plants adopt low-temperature economizer waste heat recovery and utilization technology, which can only recover about 20% of the waste heat of the flue gas, and a large part of the sensible heat and latent heat in the flue gas has not been fully utilized

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