污水处理厂多能互补的综合能源供应系统构建及经济性分析

Construction of multi-energy complementary integrated energy supply system for sewage treatment plant and its economic analysis

在节约能源、降低排放的压力下,利用可再生能源成为企业实现降本增效的重要手段。污水处理厂结合所在地太阳能资源丰富、建构筑物遮挡率低以及污水热源丰富的优势,在厂内建设分布式光伏,安装污水源热泵,构建了多能互补的综合能源供应系统。系统中污水处理厂日均处理水量为4万m^3,用电量巨大;光伏发电供污水处理及污水源热泵使用,剩余电量上网出售,平均年发电量为1 059 018 k W·h,平均年等效利用小时数为1 170,自用率达94%,每年节约电费及余电上网收入为119万元;同时,污水源热泵比空调系统年节约电量150 763 k W·h。多能互补的综合能源供应系统每年节约标准煤387.1 t,减排483.6 t二氧化碳以及其他大气污染物,可提高资源利用率,促进节能减排,有效降低生产运营成本。

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 40 000 m3,which consumes a huge amount of electricity. The photovoltaic power generation system,whose average annual electricity production is 1 059 018 kW ·h,average annual equivalent utilization hours are 1 170 and self-use rate is94%,could provide sufficient electricity for sewage treatment system and sewage source heat pumps,and the remaining electricity could be sold online,which would save 1 190 000 yuan for the plant in total. In addition,compared with the air conditioner system,the sewage source heat pumps also could save electricity150 763 kW ·h. In conclusion,the multi-energy complementary integrated energy supply system could save standard coal 387. 1 t and reduce emissions of CO_2 and other pollutions 483. 6 t year,and which is helpful to improve the resource utilization rate,promote energy conservation and emissions reduction and reduce the operation costs.