集中供热管网热泵梯级利用的节能设计与实践分析

Energy-saving Design and Practical Analysis of Cascade Utilization of Heat Pumps in Centralized Heating Pipeline Network

摘要:

针对集中供热管网中大量低温回水热量未能充分利用的问题,文章采用理论分析与工程实践相结合的方法,构建以吸收式热泵、压缩式热泵等为主的多种利用系统结构,并建立系统能效评价指标体系。研究结果表明,在大同某供热改造工程中,热泵梯级利用使一次网回水温度由65 ℃降至39 ℃,管网输配能力提升38%;某乏汽余热梯级回收集中供暖系统的运行数据显示,系统余热总回收量为64.91×10⁴ GJ,节能率为49.11%。

Abstract:

In response to the problem of insufficient utilization of a large amount of low-temperature return water heat in centralized heating pipelines, this article adopts a combination of theoretical analysis and engineering practice to construct multiple utilization system structures mainly using absorption heat pumps, compression heat pumps, etc., and establishes a system energy efficiency evaluation index system. The research results show that in a heating renovation project in Datong, the cascade utilization of heat pumps reduced the return water temperature of the primary network from 65 ℃ to 39 ℃, and increased the transmission and distribution capacity of the network by 38%. The operation data of a certain exhaust steam waste heat cascade recovery centralized heating system shows that the total amount of waste heat recovered by the system is 64.91×10⁴ GJ, with an energy-saving rate of 49.11%.