Application analysis of core equipment for waste heat recovery of low-temperature flue gas

The characteristics and applicability of flue gas heat exchangers and lithium bromide absorption heat pumps in waste heat recovery of low-temperature flue gas are comprehensively analysed. In terms of the flue gas heat exchanger selection, compared with direct contact heat exchangers, indirect contact heat exchangers have a smaller volume, lower resistance, less land occupation and simpler system, but lower temperature requirement for low-temperature water. In the selection of lithium bromide absorption heat pumps, the heating characteristics of single effect lithium bromide absorption heat pumps and double effect lithium bromide absorption heat pumps and matching with different heat exchangers are analysed. The practical application shows that double effect heat pumps have low heating temperature and high efficiency，which is suitable for matching with direct contact heat exchangers, and that single effect heat pumps are more applicable and widely used, which is suitable for matching with two types of heat exchangers.