节能技术与应用64节能ENERGYCONSERVATIONNO.012023山东某老旧小区大温差清洁供暖系统应用分析沈鲁光1闫冬梅1文静1，2左晓栋1李东旭1马振杰1（1.临沂智慧新能源科技有限公司，山东临沂276000；2.临沂智慧新能源研究院，山东临沂276000）摘要：以山东某老旧小区片区为例，采用高效梯级利用污水低品质热的大温差清洁供暖工艺进行供暖改造，对改造后系统的节能及技术经济性进行探究分析。结果表明：采用双级污水源热泵+乙二醇换热器结构工艺，可以有效实现污水低品质热的高效梯级利用，降低第二级热泵蒸发器因中水温度过低导致的结冰、胀裂风险，最低可实现中水1.5℃超低温排放；用户侧针对不同末端形式、不同温度的供暖水需求，采用梯级降温供暖工艺，实现小流量、大温差供暖；与燃气锅炉供暖工艺相比，污水源热泵供暖工艺采用电能驱动，不受天然气价格及气量限制的影响，供暖稳定性较好，且运行成本较低，可盈利4.19元/m2，项目主设备投资回收期约5.7年。关键词：低品质热；梯级利用；大温差；污水源热泵；清洁供暖中图分类号：TK11文献标识码：B文章编号：1004-7948（2023）01-0064-04doi：10.3969/j.issn.1004-7948.2023.01.017ApplicationanalysisofcleanheatingsystemwithlargetemperaturedifferenceinanoldresidentialareainShandongSHENLu-guangYANDong-meiWENJingZUOXiao-dongLIDong-xuMAZhen-jieAbstract：TakinganoldresidentialareainShandongasanexample,ahigh-efficiencystep-by-steplargetemperaturedifferencecleanheatingprocessusingthelow-qualityheatofsewageisadoptedforheatingrenovation,andtheenergy-savingandtechnicaleconomyofthereformedsystemareanalyzed.Theresultsshowthatthetwo-stagesewagesourceheatpump+ethyleneglycolheatexchangerstructureprocesscaneffectivelyrealizethehigh-efficiencycascadeutilizationoflow-qualitysewageheat,andavoidtheriskoffreezingandcrackingoftheevaporatorofthesecond-stageheatpumpcausedbythelowtemperatureofreclaimedwater,andcanrealizetheultra-lowtemperaturedischargeofreclaimedwaterat1.5℃atthelowest.Accordingtothedemandofheatingwaterwithdifferentterminalformsanddifferenttemperatures,usersadoptthecascadecoolingheatingtechnologytorealizesmallflowandlargetemperaturedifferenceheating.Comparedwiththegasboilerheatingprocess,thesewagesourceheatpump...
