反冲洗降膜式污水源热泵机组供热性能实验测试

doi:10.16085/j.issn.1000-6613.2021-1120

化工进展 ›› 2022, Vol. 41 ›› Issue (5): 2698-2705.DOI: 10.16085/j.issn.1000-6613.2021-1120

反冲洗降膜式污水源热泵机组供热性能实验测试

张群力¹^,²^,³(), 杨一雄¹, 张新超³, 刘芳¹

^1.北京建筑大学供热、供燃气、通风与空调工程北京市重点实验室，北京 100044
^2.北京建筑大学北京节能减排与城乡可持续发展省部共建协同创新中心，北京 100044
^3.湖南大学土木工程学院，湖南长沙 410082

收稿日期:2021-05-27 修回日期:2021-08-28 出版日期:2022-05-05 发布日期:2022-05-24
通讯作者: 张群力
作者简介:张群力（1977—），男，博士，教授，研究方向为供热节能。E-mail：zhangqunli@bucea.edu.cn。
基金资助:
北京建筑大学市属高校基本科研业务费专项(X20026);北京建筑大学研究生创新项目(PG2020032)

Experimental test on heating performance of backwash falling film sewage source heat pump unit

ZHANG Qunli¹^,²^,³(), YANG Yixiong¹, ZHANG Xinchao³, LIU Fang¹

^1.Beijing Key Lab of Heating, Gas Supply, Ventilating and Air Conditioning Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China
^2.Beijing Energy Conservation & Sustainable Urban and Rural Development Provincial and Ministry Co-construction Collaboration Innovation Center, Beijing University of Civil Engineering and Architecture, Beijing 100044, China
^3.College of Civil Engineering, Hunan University, Changsha 410082, Hunan, China

Received:2021-05-27 Revised:2021-08-28 Online:2022-05-05 Published:2022-05-24
Contact: ZHANG Qunli

摘要/Abstract

摘要：

污水源热泵供热是城市污水热能利用的重要途径。为提高原生污水源热泵机组回收城市污水余热的能效，本文提出反冲洗降膜式污水源热泵机组供热系统，建立了污水源热泵机组供热性能实验系统，可与满液式污水热泵机组的供热性能进行比较研究，为解决直接换热式污水源热泵系统遇到的原生污水堵塞问题，本文还设计了污水反冲洗系统，并测试了反冲洗频率和时长对机组换热性能的影响。实验结果表明：降膜式污水蒸发器的平均传热系数要显著高于满液式污水蒸发器，降膜式污水蒸发器的平均传热系数比满液式污水蒸发器高了60.17％；在文中工况下，利用降膜式污水蒸发器的污水源热泵机组的供热性能系数要显著高于满液式污水蒸发器的污水源热泵机组，降膜式污水源热泵机组的供热性能系数比满液式污水蒸发器高了9.52%；污水反冲洗方式可以有效解决直接换热式原生污水源热泵系统的堵塞问题，在使用反冲洗模式时，反冲洗的时间间隔应尽可能短，以确保平均传热系数不会减小。因此，利用反冲洗降膜式蒸发器的污水源热泵机组可以更加高效地利用污水热能。

关键词: 废水, 泵, 降膜式蒸发器, 传热, 反冲洗

Abstract:

Heating by wastewater source heat pump (WWSHP) is an important way for urban sewage heat utilization. In order to improve the energy efficiency of the original WWSHP unit in recovering urban sewage waste heat, the heating system of the backwash falling film WWSHP unit was proposed, which can be compared with the heating performance of the full liquid WWSHP unit. The sewage backwash system was also designed to reduce primary sewage blockage in the direct heat exchange WWSHP. Experimental results showed that the average overall heat transfer coefficient (OHTC) of the wastewater falling film evaporator (WFFE) was significantly higher than that of the wastewater flooded evaporator (WFE). The average OHTC of the WFFE was 60.17% higher than that of the WFE. Under the working conditions tested, the heating performance coefficient of the WWSHP with WFFE was significantly higher than that with WFE. The average coefficient of performance in falling film mode was 9.52% higher than that in the flooded mode. The wastewater backwash can solve the blocking problem of direct heat exchange primary WWSHP unit. When using the backwash mode, the time interval for backwashing should be as short as possible to ensure that the average heat transfer coefficient will not decrease. Therefore, the WWSHP unit using the backwash falling film evaporator can use the sewage heat more efficiently.

Key words: waste water, pump, falling film evaporator, heat transfer, backwash

中图分类号:

X703

张群力, 杨一雄, 张新超, 刘芳. 反冲洗降膜式污水源热泵机组供热性能实验测试[J]. 化工进展, 2022, 41(5): 2698-2705.

ZHANG Qunli, YANG Yixiong, ZHANG Xinchao, LIU Fang. Experimental test on heating performance of backwash falling film sewage source heat pump unit[J]. Chemical Industry and Engineering Progress, 2022, 41(5): 2698-2705.

图/表 14

参考文献 17

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参数	数值
壳体直径/mm	450
壳体长度/m	2.158
换热管内径/mm	16.15
换热管外径/mm	16.25
管心距/mm	20.5
分程管心距/mm	36
换热管数/根	60
换热管长度/m	1.87
换热管管程数	4
换热面积/m²	5.7

参数	数值
壳体直径/mm	450
壳体长度/m	2.158
换热管内径/mm	16.15
换热管外径/mm	16.25
管心距/mm	20.5
分程管心距/mm	36
换热管数/根	60
换热管长度/m	1.87
换热管管程数	4
换热面积/m²	5.7

参数	数值
换热管直径/mm	25.4
管心距/mm	32
换热管数/根	374
换热管长度/m	4.25
换热管管程数	4
换热面积/m²	5.7

参数	数值
换热管直径/mm	25.4
管心距/mm	32
换热管数/根	374
换热管长度/m	4.25
换热管管程数	4
换热面积/m²	5.7

设备名称	型号/参数	数量	备注
压缩机	SZ147A4ALB	2台	两台压缩机并联
冷凝器	换热面积12.9m²	1台	热水管
降膜式污水蒸发器	换热面积5.7m²	1台	污水管
满液式污水蒸发器	换热面积5.7m²	1台	污水管
电磁阀	DN50	4个
时间继电器	DH48	1个
控制柜		1套	持续监控实验数据
制冷剂	R134a

反冲洗降膜式污水源热泵机组供热性能实验测试

Experimental test on heating performance of backwash falling film sewage source heat pump unit

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图/表 14

参考文献 17

相关文章 15

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Metrics

本文评价

测量仪器	型号/参数	数量	精度
电磁流量计	速度范围0.3～12m/s	2	± 0.3%
压力传感器	压力范围0～18.2bar	6	± 0.5%
热电偶温度计	K型	6	± 0.2%
功率计	三相/ 4线		± 0.2%

名称	不确定度
蒸发器换热量	± 1.4%
冷凝器换热量	± 1.4%
污水源热泵机组供热系数	± 1.8%
污水换热器总传热系数	± 3.9%

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