Economic analysis of low temperature flue gas waste heat utilization in distributed energy system

Abstract

Abstract:

Taking LM2500+G4 gas turbine combined cycle distributed energy system as a research object, the heat of low temperature flue gas is absorbed by expanded heat exchange surface at the tail of the waste heat boiler. And the waterwater heat exchanger and the hot water storage tank are arranged for hot water storage. There are 9 configuration schemes for domestic hot water supplying system using flue gas waste heat, according to 3 waste heat utilization amounts and 3 kinds of transmission modes.Their economical characteristics are analyzed under certain hot water or tap water price level. The investment recovery period of 9 configuration schemes are all between 1~3 years, which are of good economy. With unchanged water transmission mode, the more waste heat is utilized, the better system economy will be. And with constant waste heat utilization, the shorter water storage time is, the better system economy will be.

Key words:

distributed energy system, waste heat utilization of low temperature flue gas, economic analysis, payback period

JIANG Ting1,2，XU Jingjing1,2，MA Qin1,2，YU Li1,2.

Economic analysis of low temperature flue gas waste heat utilization in distributed energy system

[J]. Huadian Technology, 2019, 41(5): 46-49.

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Economic analysis of low temperature flue gas waste heat utilization in distributed energy system

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