Kinetic analysis of coupled effects of CO2 and H2 additions on laminar lean premixed dimethyl ether flames is performed at atmospheric pressure. The coupled effects of H2/CO2 additions on major species, intermediate s...Kinetic analysis of coupled effects of CO2 and H2 additions on laminar lean premixed dimethyl ether flames is performed at atmospheric pressure. The coupled effects of H2/CO2 additions on major species, intermediate stable species and radicals are discussed and analyzed in detail. The dilution, thermal and chemical effects of H2 and CO2 are separated and identified. The results show that H2 addition can slightly mitigate the CO2 chemical effects on decreasing the temperatures, H radical concen- tration, acetylene mole fraction and formaldehyde concentration. After CO2 is added, the H2 chemical effects on increasing the temperatures are enhanced. DME oxidation is promoted by the H2 chemical effects, which is further strengthened by the CO2 addition. Moreover, CO2 addition can reduce the H2 chemical effects on increasing the H radical mole fraction, but strengthen the H2 chemical effects on increasing the production of HO2 and C2H2. CH2O formation can be promoted by the H2 chemical effects, which is enhanced by the CO2 addition. In actually, the H2/CO2 coupled chemical effects almost have no obvious in- fluence on the temperatures and HO2 mole fraction. DME consumption is delayed by the H2/CO2 coupled chemical effects. Furthermore, the H2/CO2 coupled chemical effects can decrease the H radical mole fraction, CH4 concentration, C2H2 mole fraction, CH2O concentration and CHaCHO mole fraction, but increase the CO concentration.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.51576100&51306091)the Jiangsu Provincial Natural Science Foundation of China(Grant Nos.BK20140034&BK20130758)+1 种基金Jiangsu “Shuangchuang Program”the Jiangsu Provincial Project of “Six Talent Summit”(Grant No.2014-XNY-002)
文摘Kinetic analysis of coupled effects of CO2 and H2 additions on laminar lean premixed dimethyl ether flames is performed at atmospheric pressure. The coupled effects of H2/CO2 additions on major species, intermediate stable species and radicals are discussed and analyzed in detail. The dilution, thermal and chemical effects of H2 and CO2 are separated and identified. The results show that H2 addition can slightly mitigate the CO2 chemical effects on decreasing the temperatures, H radical concen- tration, acetylene mole fraction and formaldehyde concentration. After CO2 is added, the H2 chemical effects on increasing the temperatures are enhanced. DME oxidation is promoted by the H2 chemical effects, which is further strengthened by the CO2 addition. Moreover, CO2 addition can reduce the H2 chemical effects on increasing the H radical mole fraction, but strengthen the H2 chemical effects on increasing the production of HO2 and C2H2. CH2O formation can be promoted by the H2 chemical effects, which is enhanced by the CO2 addition. In actually, the H2/CO2 coupled chemical effects almost have no obvious in- fluence on the temperatures and HO2 mole fraction. DME consumption is delayed by the H2/CO2 coupled chemical effects. Furthermore, the H2/CO2 coupled chemical effects can decrease the H radical mole fraction, CH4 concentration, C2H2 mole fraction, CH2O concentration and CHaCHO mole fraction, but increase the CO concentration.
文摘目的:探讨凉血清肺散、米诺环素联合治疗玫瑰痤疮的临床应用效果。方法:对照组玫瑰痤疮患者经米诺环素治疗,研究组玫瑰痤疮患者给予米诺环素、凉血清肺散联合治疗。结果:研究组治疗后总有效率(87.76%)显著优于对照组(71.43%)(P <0.05);治疗后研究组皮肤病生活质量指标调查表(Dermatology Life Quality-index,DLQI)评分改善效果优于对照组(P<0.05);研究组药物相关各项不良反应发生率与对照组对比均无显著差异(P> 0.05)。结论:利用凉血清肺散、米诺环素联合治疗玫瑰痤疮效果显著,有利于保障临床疗效及预后,对维持其良好的生活质量、身心健康均具有重要价值。
