The direct discharge of flue gas from the tail of coal-fired utility boilers will cause a lot of waste heat and water loss. Based on the selective permeability of ceramic membrane tubes and the hygroscopicity of lithium bromide solution

a membrane semi-open absorption heat pump system is proposed in this paper

in which multi-channel ceramic membrane tube absorbers absorb waste heat and moisture from flue gas

and high temperature generators

regenerators and gas-liquid separators realize the regeneration of lithium bromide solution. Taking a 330 MW coalfired utility boiler as an example

the effects of circulating fluid parameter

regenerative steam flow and heat exchange amount change inside the absorber on the dewatering performance and heat recovery of membrane semi-open absorption heat pump system are analyzed. The results show that

the flow rate of lithium bromide solution is positively correlated with the outlet temperature and dehydration amount of the solution. The increase of the heat absorbed by condensate water in the absorber increases the dehydration amount

but decreases the outlet temperature of the solution. The change of flow rate of the regenerative steam will change the heat distribution of each part of the system

and the increase of flow rate of the regenerative steam can reduce the heat of driving heat source and improve the heat recovery performance of the system

but with a limit value.