Effect of releasing dissolved gas from water though decompression on flow stability of water facility

doi:10.11949/0438-1157.20191455

Abstract

Abstract:

The effect of dissolved gas in water on the flow stability and measurement accuracy are analyzed for water flow, and a microbubble exhaust valve was installed for comparison experiments. The theoretical analysis and experimental tests show that the dissolved gas in water will separate and precipitate due to the pressure difference between the front and rear ends after undergoing the decompression process, and then form free tiny bubbles, which will affect the flow stability and measurement accuracy of the water-flow calibrated facility. When water flows through the microbubble exhaust valve, it can capture the tiny bubbles separated from the water, thus improving the flow stability and measurement accuracy of the water flow device. The microbubble exhaust valve can make the flow stability reach the level of 0.1%－0.2%, and put forward a new influence factor for the design of water flow standard device and the study of flow stability.

Key words: flow stability, bubble, solubility, Henry s law, gas releasing by decompressing

摘要：

针对水流量标准装置分析了水中溶解气对流量稳定性和计量精度的影响，并安装了微泡排气阀进行对比实验。经理论分析和实验测试表明，水中溶解气在经历减压过程后会由于前后端压差而分离析出，然后形成游离的微小气泡，这些微小气泡在水中继续流动，这会影响水流量标准装置的流量稳定性和计量精度，当水流经微泡排气阀后，微泡排气阀可以捕捉从水中分离析出的微小气泡，从而提高了水流量装置的流量稳定性和计量精度，可使流量稳定性达到0.1%～0.2%的水平，为水流量标准装置的设计和流量稳定性的研究分析了一种新的影响因素并就此提供了解决方案。

关键词: 流量稳定性, 气泡, 溶解性, 亨利定律, 减压释放

CLC Number:

O 642

Yuhao LIU, Ying XU, Tao ZHANG, Qinghua FENG, Fengfeng QI. Effect of releasing dissolved gas from water though decompression on flow stability of water facility[J]. CIESC Journal, 2020, 71(5): 2069-2075.

刘雨豪, 徐英, 张涛, 冯庆华, 齐锋锋. 减压释放水中溶解气对水装置流量稳定性的影响[J]. 化工学报, 2020, 71(5): 2069-2075.

Figures/Tables 8

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测试时间	无微泡排气阀流量稳定性/%	有微泡排气阀流量稳定性/%
第1分钟内	0.315	0.250
第2分钟内	0.301	0.208
第3分钟内	0.316	0.192
第4分钟内	0.328	0.220
第5分钟内	0.318	0.201
第6分钟内	0.290	0.200
第7分钟内	0.245	0.184
第8分钟内	0.235	0.200
第9分钟内	0.197	0.180
第10分钟内	0.240	0.220

测试时间	无微泡排气阀流量稳定性/%	有微泡排气阀流量稳定性/%
第1分钟内	0.315	0.250
第2分钟内	0.301	0.208
第3分钟内	0.316	0.192
第4分钟内	0.328	0.220
第5分钟内	0.318	0.201
第6分钟内	0.290	0.200
第7分钟内	0.245	0.184
第8分钟内	0.235	0.200
第9分钟内	0.197	0.180
第10分钟内	0.240	0.220

测试时间	无微泡排气阀流量稳定性/%	有微泡排气阀流量稳定性/%
第1分钟内	0.257	0.174
第2分钟内	0.277	0.165
第3分钟内	0.309	0.166
第4分钟内	0.300	0.180
第5分钟内	0.286	0.180
第6分钟内	0.348	0.167
第7分钟内	0.317	0.186
第8分钟内	0.309	0.120
第9分钟内	0.286	0.220
第10分钟内	0.260	0.196

测试时间	无微泡排气阀流量稳定性/%	有微泡排气阀流量稳定性/%
第1分钟内	0.257	0.174
第2分钟内	0.277	0.165
第3分钟内	0.309	0.166
第4分钟内	0.300	0.180
第5分钟内	0.286	0.180
第6分钟内	0.348	0.167
第7分钟内	0.317	0.186
第8分钟内	0.309	0.120
第9分钟内	0.286	0.220
第10分钟内	0.260	0.196

水泵频率/Hz	无微泡排气阀流量稳定性/%	有微泡排气阀流量稳定性/%
27	0.234	0.170
38	0.268	0.159