Study on carrier gas humidification and evaporation technology for treatment of cutting waste liquid

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Abstract Using air as the carrier gas, the evaporation and concentration experiment of cutting waste liquid was carried out in the evaporation tower, and the influence of operating conditions on the evaporation process was explored. With the increase of carrier gas flow rate, the volumetric mass transfer coefficient, evaporation capacity, and pressure drop all increase, and the VOC concentration of the outlet carrier gas decreases. With the increase of carrier gas temperature and circulation flow rate, the volumetric mass transfer coefficient, evaporation capacity, pressure drop and the outlet carrier gas VOC concentration all increase. Under the present experimental conditions, the maximum volumetric mass transfer coefficient and evaporation are 13.95 g·(m³·s)^-1 and 3.39 kg·h^-1, respectively. The maximum VOC concentration of the outlet carrier gas is 6.2 mg·L^-1, which is less than the value specified in the Comprehensive Emission Standard of Air Pollutants. The results of researches show that the carrier gas humidification evaporation process can effectively concentrate the cutting waste liquid, laying a foundation for industrial application.

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	Articles by authors
	SU Libo
	XIE Lixin
	XU Shichang
	YANG Lingling

Keywords： carrier gas humidification and evaporation cutting waste liquid concentration reduction low-grade heat source

Received 2021-04-21;

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SU Libo, XIE Lixin, XU Shichang, YANG Lingling.Study on carrier gas humidification and evaporation technology for treatment of cutting waste liquid[J] Chemcial Industry and Engineering, 2022,V39(6): 75-82

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