Energy and Exergy Analysis on China’s Natural Gas Urban District Heating Systems for Replacing Coal: A Case Study of Beijing
DOI:
https://doi.org/10.13052/dgaej2156-3306.2912Keywords:
CHP, urban district heating, distributed energy system, heat pump heating, exergy efficiency, combined cycle.Abstract
China has been vigorously developing natural gas-based urban
district heating (UDH) for years to reduce air pollution. Various UDH
systems are proposed for a case in the urban area of Beijing. This study
investigates the effects of load percentages of different prime movers on
the technical performances of several UDH systems at different ambient temperatures. A decrease in the gas turbine load percentage results
in an obvious decrease in the exergy efficiency of the UDH system. The
calculation results of heating and power outputs, energy and exergy inputs, and exergy efficiency of the UDH systems under different working
conditions are presented. The heating association of distributed energy
system and on-demand heat pump heating can reach the highest average-exergy-efficiency among the UDH systems. This optimal natural
gas-based UDH system should be promoted in China instead of natural
gas-fired heating boilers to replace coal-based UDH.
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