Water evolution characteristics of piston compressors under varying operating conditions based on the moisture separation coefficient

doi:10.19799/j.cnki.2095-4239.2021.0346

Abstract

Abstract:

The expansion and heat absorption process in compressed-air energy storage (CAES) systems cause water vapor in the compressed air to freeze, which not only causes mechanical damage to the expander blades but also affects the expander performance. Herein, the interstage water evolution characteristics of multistage piston compressors in the energy storage subsystem are investigated to provide a reference for designing compressor systems and pretreatment of the compressed air before the inlet of the expander. First, the compression and enhancement factors are comprehensively considered, and the water evolution process is derived using the method of moisture evolution coefficient. The expressions of water evolution at different levels were obtained, and the suction and exhaust pressure and temperature, exhaust volume, separator level, and other parameters were sampled. The water evolution characteristics at each stage of the compressor were examined under various operating conditions. As the exhaust pressure of the compressor increased from 1.5 to 9.0 MPa, liquid water was not precipitated when the wet air passed through the first stage of the compressor. The theoretical and experimental results of water discharge at different stages vary from 0 to 10%.

Key words: compressed air energy storage, piston compressor, interstage condensed water, humidity air

CLC Number:

TH 457

Ran XU, Zhitao ZUO, Ao LI, Xia WANG, Ming CHEN, Haisheng CHEN. Water evolution characteristics of piston compressors under varying operating conditions based on the moisture separation coefficient[J]. Energy Storage Science and Technology, 2021, 10(5): 1556-1564.

Figures/Tables 10

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排气压力/MPa	二级计算值/(kg·h^-1)	三级计算值/(kg·h^-1)	四级计算值/(kg·h^-1)	五级计算值/(kg·h^-1)
1.81686	61.6989	21.15284	2.57536	4.07147
2.23532	62.25604	25.12674	5.9993	3.03963
2.54782	57.24528	29.23315	5.63257	3.94956
3.02926	56.93688	26.97622	5.56465	4.3412
3.37057	54.25568	26.3881	5.55831	4.63594
3.70065	55.99889	24.32745	5.93007	4.43581
4.21628	58.06155	22.85599	6.94215	4.00324
4.39499	57.17601	23.24329	7.57461	3.28392
4.74362	57.86547	23.63455	8.20369	3.22844
5.08151	54.74876	22.7441	7.79499	3.31372
5.54245	52.28301	24.39384	7.42308	5.0282
5.91549	55.40382	21.03305	7.11788	4.86697
6.48874	62.59014	20.91824	7.19558	4.98453
6.87546	62.75424	20.53967	6.97236	4.82207
7.26999	67.21293	21.3235	7.11101	4.84979
7.67819	71.16939	21.97167	7.21554	4.94981
7.86569	69.73376	21.95691	7.14489	4.89348
8.42038	66.80875	22.42398	7.42137	4.93671
8.80319	64.02165	22.83083	7.34191	4.9032

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