Abstract: To reclaim and utilize biogas produced during sludge treatment process in sewage treatment plants,the schemes and flow processes for utilizing the biogas were studied.A direct-fired heat pump heating system based on biogas from sewage treatment plant was structured,and the configuration and economic analysis of the system were also made.Results indicated that compared with coal-fired boiler,gas-fired boiler and electricity driven heat pump,a biogas direct-fired heat pump system of 600 kW input power,which was assumed to operate in heating mode for 300 days annually,could save 510 t of standard coal or 3.25?10⁵ m³ of natural gas or 7.72?10⁵ kW穐 of electricity.The initial cost of the system could be paid back in no more than 2.6 years.Therefore,this heating system was featured by good economic,energy saving and emission reduction properties,and the economic and environmental interests produced by the system should be significant.

Key words: sewage treatment plant, biogas, biogas purification, direct-fired heat pump, flow process, energy saving and emission reduction

摘要： 为了回收利用污水厂处理污泥过程中产生的沼气,研究了利用污水厂沼气能源的方案、工艺流程,构建出基于污水厂沼气的直燃型热泵供热系统,并进行了系统配置与经济性分析。结果表明:与燃煤锅炉、燃气锅炉以及电动热泵相比,以污水厂沼气为燃料,输入功率为600 kW的直燃型热泵系统,按年供热运行300天计,可分别节约标准煤510 t、天然气3.25×10⁵ m³、用电量7.72×10⁵ kW·h,投资回收期最长不超过2.6年。因此,该供热系统具有经济性高和节能减排的特点,经济效益和环保效益显著。

关键词: 污水厂, 沼气, 沼气净化, 直燃型热泵, 工艺流程, 节能减排