Abstract:Under the pressures of energy conservation and emissions reduction, the utilization of renewable energy becomes an important means to reduce cost and improve efficiency of an enterprise. Combining with the local advantages of rich solar energy resources, low shielding rate of buildings and rich sewage heat sources, the sewage treatment plant builds distributed photovoltaic system and installs sewage source heat pumps in plant, which constructs a multienergy complementary integrated energy supply system. In the system, the average treatment capacity of sewage treatment plant is 40000m3, which consumes a huge amount of electricity. The photovoltaic power generation system, whose average annual electricity production is 1059018kW·h, average annual equivalent utilization hours are 1170 and selfuse rate is 94%, could provide sufficient electricity for sewage treatment system and sewage source heat pumps, and the remaining electricity could be sold online, which would save 1190000 yuan for the plant in total. In addition, compared with the air conditioner system, the sewage source heat pumps also could save electricity 150763kW·h. In conclusion, the multienergy complementary integrated energy supply system could save standard coal 387.1t and reduce emissions of CO2 and other pollutions 483.6t year, and which is helpful to improve the resource utilization rate, promote energy conservation and emissions reduction and reduce the operation costs.

Keywords:multienergy complement, integrated energy supply system, sewage treatment plant, distributed photovoltaic, sewage source heat pump, energy conservation and environmental protection