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首页> 外文期刊>Energy >A new waste heat district heating system with combined heat and power (CHP) based on ejector heat exchangers and absorption heat pumps
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A new waste heat district heating system with combined heat and power (CHP) based on ejector heat exchangers and absorption heat pumps

机译：基于喷射热交换器和吸收式热泵的新型热电联产废热集中供热系统

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摘要

A new waste heat district heating system with CHP based on ejector heat exchangers and absorption heat pumps (DH-EHE) is presented to decrease heating energy consumption of existing CHP systems by recovering waste heat of exhausted steam from a steam turbine, which could also increase heat transmission capacity of the primary heating network (PHN) by decreasing temperature of the return water of existing PHN. A new ejector heat exchanger based on ejector refrigeration cycle is invented to decrease temperature of the return water of PHN to 30 ℃ under the designed case. DH-EHE is analyzed in terms of laws of thermodynamics and economics. Compared to conventional district heating systems with CHP (CDH), DH-EHE can decrease consumption of steam extracted from a steam turbine by 41.4% and increase heat transmission capacity of the existing PHN by 66.7% without changing the flow rate of circulating water. The heating cost of DH-EHE is 8.62 ¥/GJ less than that of CDH. Compared to CDH, the recovery period of additional investment of DH-EHE is about two years. DH-EHE shows better economic and environmental benefits, which is promising for both district heating systems for long-distance heat transmission and waste heat district heating systems.
机译：提出了一种基于喷射热交换器和吸收式热泵的带有CHP的新型余热区域供热系统，通过回收蒸汽轮机排出的蒸汽余热来减少现有CHP系统的热能消耗，这也可能增加通过降低现有PHN的回水温度来实现一次热网（PHN）的热传递能力。在设计方案下，发明了一种基于喷射器制冷循环的新型喷射器热交换器，将PHN的回水温度降低到30℃。 DH-EHE是根据热力学和经济学定律进行分析的。与传统的带有CHP（CDH）的区域供热系统相比，DH-EHE可以在不改变循环水流量的情况下，将蒸汽轮机抽取的蒸汽消耗降低41.4％，将现有PHN的传热能力提高66.7％。 DH-EHE的加热成本比CDH少8.62¥/ GJ。与CDH相比，DH-EHE追加投资的回收期约为两年。 DH-EHE具有更好的经济和环境效益，这对于长距离传热的区域供热系统和余热区域供热系统都是有希望的。

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