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Title:: Enrichment Effect of Methane Escaped from Hot Springs in the Tengchong Volcanic Area

Author(s):: RAN hua; ZHAO Ci-ping; CHEN Kun-hua; (Earthquake Administration of Yunnan Province,Kunming 650224,Yunnan,China)

Keywords:: methane enrichment; gas sampling; improvement; spring; Tengchong volcano

摘要:: 对具有甲烷富集功能的温泉逸出气体取样装置在腾冲火山区部分泉点采集样品的现场富集效果进行了分析,发现CO₂含量和温度对甲烷富集效果的影响较大。在CO₂含量很高(90%)的情况下,温度相对较高(>50℃)的泉点富集效果好,而低温泉点(<50℃)富集效果差,原因是:温度越高化学反应速率越大,反应越充分; 高CO₂的低温泉水中饱和的HCO^-₃与NaOH反应,消耗掉了大量的NaOH,导致NaOH

Abstract:: We sampled methane escaped from the hot spring in the Tengchong volcanic area,and analyzed the effect of enriching methane of sampling equipment.We find that the enrichment effect is constrained by both content of CO₂ in spring and temperature of spring water.When the content of CO₂ is high(>90%),the enrichment effect of methane from high-temperature spring(>50℃)is better than that from low-temperature ones(<50℃).This is because that the temperature impacts chemistry reaction speed or the ability for CO₂ to dissolve into spring water.In the condition of high temperature,the content of HCO^-₃ in spring water is low and the reaction velocity between CO₂ and NaOH solution is quick.In the condition of low temperature,because the content of HCO^-₃ in spring water is saturated or supersaturated,it makes NaOH depleted and the absorption of CO₂ weaken.We improve sampling method for low temperature springs by two measures,using more clear water(purified water)to compound CO₂ absorption solution(NaOH solution)and employing manually-controlling the flow of gas which enters the sample-collecting installation.These measures increase the effect of CH₄ enrichment significantly.