Abstract:

Due to the influence of mass concentration characteristics and corrosivity of lithium bromide solution, the exhaust gas temperature of the flue gas hot water lithium bromide unit of buildingtype distributed energy system cannot be lower than 160℃ during cooling period in summer. In order to reduce the exhaust gas temperature of the system, it proposes 2 schemes which are setting up a flue gas hot water heat exchanger at the exhaust outlet of the lithium bromide unit and providing domestic hot water externally, or increasing hot water flow that flow into the lithium bromide unit. Taking a distributed energy system project as an example, the annual average energy utilization efficiency of the 2 schemes are calculated and the results show that setting up flue gas hot water heat exchanger can reduce the system exhaust gas temperature, and greatly improve the annual average energy utilization efficiency.

Key words:

buildingtype natural gas distributed energy system, flue gas hot water lithium bromide unit, exhaust gas temperature, flue gas hot water heat exchanger, annual average energy utilization efficiency