重气泄漏扩散是一种危害性较大的多发事故,而一旦在人口密集区域发生泄漏事故,周围居民将处境危险。重气泄漏后一般沿地面扩散,而地形条件是影响其扩散行为的重要因素。本文利用计算流体力学方法(CFD)对Thorney Island Trial026实验条...重气泄漏扩散是一种危害性较大的多发事故,而一旦在人口密集区域发生泄漏事故,周围居民将处境危险。重气泄漏后一般沿地面扩散,而地形条件是影响其扩散行为的重要因素。本文利用计算流体力学方法(CFD)对Thorney Island Trial026实验条件进行了数值模拟,考察障碍物对气体扩散的影响并与实验结果进行对比。结果表明,模拟结果与实验数据的吻合性较好,证明CFD软件能够较准确地模拟障碍物地形条件下的重气扩散过程。展开更多
To improve the separation performance of a supersonic gas separation device for the treatment of gas mixture with a single heavy component, a novel structure with shorter settlement distance was constructed and a meth...To improve the separation performance of a supersonic gas separation device for the treatment of gas mixture with a single heavy component, a novel structure with shorter settlement distance was constructed and a method of droplet enlargement was applied. A series of experiments were carried out in the improved separation device under various conditions, using air-ethanol vapor as the medium and micro water droplets as nucleation cen- ters. The effects of the inlet pressure, temperature and relative humidity, the swirling intensity, and mass flow rate of water on the separation performance were investigated. The separation was improved by increasing the inlet pressure and relative humidity. With the decrease of swirling intensity and mass flow rate of water, the separation efficiency increased first and then decreased. The inlet temperature had a slight effect on the separation. The results showed that the separation performance was effectively improved using the proposed structure and method, and the best separation in this study was obtained with the ethanol removal rate about 55% and dew point depression 27 K. The addition of water had little pollution to the air-ethanol vapor system since the water carry-over rate was within the range of -2 %-0 in most cases.展开更多
Coalbed gas （CBG） in Enhong syncline, eastern Yunnan China, is character- ized by high concentration of heavy hydrocarbon with the highest content of ethane, which is more than 30%. Some previous investigators pai...Coalbed gas （CBG） in Enhong syncline, eastern Yunnan China, is character- ized by high concentration of heavy hydrocarbon with the highest content of ethane, which is more than 30%. Some previous investigators paid much attention to the abnormal concentration of heavy hydrocar- bon in the CBG of Enhong, but few have researched on its origin. This article describes the characteristics of abnormal high concentration of heavy hydrocarbon in Enhong syncline and analyzes its reason from the aspects of origin and evolution of heavy hydrocarbon by carbon isotope, coal petrography, and coal rank. Features of gas carbon isotope composition display that there is no inorganic gas or off components in the CBG, which is classified to thermogenetic gas produced by humic material, with characteristic of secondary biogenic gas in shallow coal seam. The concentration of heavy hydrocarbon in Enhong syncline increases with the increase of vitrinite, vitrinite/inertinite ratio, and hydrogen/carbon ratio and decreases with the increase of inertinite, so hydrogen-rich vitrinite may be a very important factor resulting in the abnormal concentration of heavy hydrocarbon. It also increases with the increase of degree of coalifica-tion of coking to lean coals during which the peak of heavy hydrocarbon generation is reached. Therefore, we think that high concentration of heavy hydrocarbon originated from the coupling effect of higher content of the hydrogen-rich vitrinite in the coal and the coal rank of coking to lean coals.展开更多
文摘重气泄漏扩散是一种危害性较大的多发事故,而一旦在人口密集区域发生泄漏事故,周围居民将处境危险。重气泄漏后一般沿地面扩散,而地形条件是影响其扩散行为的重要因素。本文利用计算流体力学方法(CFD)对Thorney Island Trial026实验条件进行了数值模拟,考察障碍物对气体扩散的影响并与实验结果进行对比。结果表明,模拟结果与实验数据的吻合性较好,证明CFD软件能够较准确地模拟障碍物地形条件下的重气扩散过程。
基金Supported by the Natural Science Foundation of Liaoning Province, China （20052193） and Ph.D. Programs Foundation of Ministry of Education o f China （20070141045）.
文摘To improve the separation performance of a supersonic gas separation device for the treatment of gas mixture with a single heavy component, a novel structure with shorter settlement distance was constructed and a method of droplet enlargement was applied. A series of experiments were carried out in the improved separation device under various conditions, using air-ethanol vapor as the medium and micro water droplets as nucleation cen- ters. The effects of the inlet pressure, temperature and relative humidity, the swirling intensity, and mass flow rate of water on the separation performance were investigated. The separation was improved by increasing the inlet pressure and relative humidity. With the decrease of swirling intensity and mass flow rate of water, the separation efficiency increased first and then decreased. The inlet temperature had a slight effect on the separation. The results showed that the separation performance was effectively improved using the proposed structure and method, and the best separation in this study was obtained with the ethanol removal rate about 55% and dew point depression 27 K. The addition of water had little pollution to the air-ethanol vapor system since the water carry-over rate was within the range of -2 %-0 in most cases.
基金supported by the National Natural Science Foundation of China (No.40730422)the National Science and Technology Key Special Project of China (No.2011ZX05034)the Fundamental Research Funds for the Central Universities of China (No.2010QNA51)
文摘Coalbed gas （CBG） in Enhong syncline, eastern Yunnan China, is character- ized by high concentration of heavy hydrocarbon with the highest content of ethane, which is more than 30%. Some previous investigators paid much attention to the abnormal concentration of heavy hydrocar- bon in the CBG of Enhong, but few have researched on its origin. This article describes the characteristics of abnormal high concentration of heavy hydrocarbon in Enhong syncline and analyzes its reason from the aspects of origin and evolution of heavy hydrocarbon by carbon isotope, coal petrography, and coal rank. Features of gas carbon isotope composition display that there is no inorganic gas or off components in the CBG, which is classified to thermogenetic gas produced by humic material, with characteristic of secondary biogenic gas in shallow coal seam. The concentration of heavy hydrocarbon in Enhong syncline increases with the increase of vitrinite, vitrinite/inertinite ratio, and hydrogen/carbon ratio and decreases with the increase of inertinite, so hydrogen-rich vitrinite may be a very important factor resulting in the abnormal concentration of heavy hydrocarbon. It also increases with the increase of degree of coalifica-tion of coking to lean coals during which the peak of heavy hydrocarbon generation is reached. Therefore, we think that high concentration of heavy hydrocarbon originated from the coupling effect of higher content of the hydrogen-rich vitrinite in the coal and the coal rank of coking to lean coals.
