我国中小城镇众多，能源供应尤其是热力供应，城市干线往往难以覆盖，中小城镇的采暖需求多以建设于城镇周边热源厂通过热水锅炉满足。为了加快实现中小城镇清洁供能，文章提出了一种协同利用城市污水低温热源，弃风、弃光电量及清洁燃煤蒸汽背压机组的综合能源供应系统。在采暖季，采用污水源热泵利用弃风、弃光电能吸收城镇污水中低温热量，对热网水进行初级加热，利用燃煤蒸汽背压机组排汽进行二次加热，实现热网水梯级升温，加热热源能级匹配。利用污水源热泵一方面可利用低价弃风、弃光电量吸收城镇污水的低温余热，另一方面可降低清洁燃煤蒸汽背压机组的配置容量，减少化石能源的消耗，该系统可为北方城镇低碳供能提供有益参考。

There are many medium and small towns in the north of China, and these districts are hard to be covered by main line of energy supply, particularly heating power supply. Hot-water boiler is the common equipment to meet heating demand which is installed around the town. This paper presents an integrated multi-energy supply system which uses low temperature exhaust heat of sewage, abandoned wind and photovoltaic power, coal-fired chemical energy. In heating season, the heat-supply water is heated by sewage source heat pump first, and then heated by exhaust steam of coal-fired unit. The low cost abandoned wind and photovoltaic power can be used to extract heat from sewage by sewage source heat pump, so the capacity of coal-fired unit can also be reduced. This system can make use of much renewable energy and reduce fossil energy consumption and it is a beneficial reference to implement low-carbon energy supply for medium and small cities and towns in the north of China.