1) methanometry
甲烷测量法
2) methane detection
甲烷检测
1.
The analysis and the test show that one circuit can improve the stability of output signal and sensibility and the other can increase accuracy for methane detection by its linear output.
在检测甲烷气体时 ,通过反馈调节电路使催化传感元件或补偿元件上的电压保持不变 ,从而得到了两种不同工作原理的新型检测电路 ,它们对甲烷检测输出特性会产生不同的影响 。
2.
A new technique of methane detection, with constant voltage and low temperature of sensor, is developed.
提出了一种定压低温式甲烷检测方法,并分析了其工作原理和特点。
3.
Aiming at the shortcomings of existed methane detection device of coal mine,the paper(proposed) a design scheme of methane infrared detection system of coal mine based on detection principle of spectral absorption.
针对现有煤矿甲烷检测装置存在的缺点,文章提出了一种基于光谱吸收检测原理的煤矿甲烷红外检测系统的设计方案,分析了红外差分吸收检测原理,详细介绍了系统硬件及软件设计。
5) methane content
甲烷含量
1.
By the effective analysis of coal thickness,coa quality,hydrological condition,hidden depth of the coal bed surrounding rock and so on on coal bed methane content in Daxing Well Field expounds slorag of coal bed methane regular pattern and evaluales the necessity and possibity of prospecting and developing of coal bed gas in this area.
通过对铁法煤田大兴井田煤厚、煤质、水文地质条件、埋藏深度、煤层围岩物性特征等因素对煤层甲烷含量的影响分析,阐述该区煤层甲烷赋存规律,同时评价了该区煤层气勘探开发的必要性和可能性。
2.
It is analysed that the utilization of Ende powdered coal gas-making technology in methanol co-production process can result in a 20% high of CO 2 and a three to five times rise of methane content in gas in view of the characteristics of Ende powdered coal gasification and operational fluidized bed gasification parameters at hand.
根据恩德粉煤气化的特点 ,及已有的沸腾床气化数据 ,分析认为 :联醇工艺采用恩德粉煤制气 ,将使煤气中CO2 含量高达 2 0 % ,甲烷含量升高 3~ 5倍。
6) methane flux
甲烷通量
1.
The relationship of sulfate-methane interface with the methane flux and the underlying gas hydrate;
硫酸盐-甲烷界面与甲烷通量及下伏天然气水合物赋存的关系
2.
The sulfate-methane interface is an important biogeochemical identification interface for the areas with high methane flux and containing gas hydrate.
南海北部陆坡的柱状沉积物孔隙水数据的分析显示,其硫酸盐-甲烷界面埋深比较浅,表明该海域的甲烷通量较高。
3.
In 2007,the enclosed chamber technique was used and the measurements on methane flux from Spartina alterniflora were taken during three periods(before the flood,in the course of rising and ebbing tide,and after the ebb) in the Shanyutan wetland which is the largest wetland in the Min River estuary region.
2007年利用静态箱-气相色谱仪法对闽江河口湿地外来入侵种互花米草斑块甲烷通量进行测定。
补充资料:甲烷
甲烷 methane 最简单的烷烃,分子式CH4。广泛存在于自然界。天然气含甲烷60%~98%(体积),与石油伴生的油田气含甲烷31%~90%。煤层中的甲烷在煤矿坑道中聚集,是引起煤矿爆炸的根源。池沼中植物遗体在水中被厌氧菌分解产生含甲烷的气体,因此甲烷又称沼气。 甲烷为无色无臭的易燃气体 。熔点-182℃,沸点-164℃,相对密度0.5547(0℃)。在水中的溶解度很小,易溶于乙醇和乙醚。能生成结晶的水合物,其组成与压力和温度有关。甲烷在空气中燃烧,生成二氧化碳和水,并放出大量的热。空气中含甲烷5%~15.4%(体积)时,遇火或电火花能猛烈爆炸;空气中甲烷的含量过高,造成氧的含量远低于正常水平(如甲烷为43%,氧为12%),则能使人窒息。 甲烷部分燃烧,或在高温和催化剂存在下与水蒸气作用,生成一氧化碳和氢的混合物,即合成气,可作为合成甲醇的原料。合成气继续与水蒸气作用,则生成二氧化碳和较多的氢,用氢氧化钠吸收二氧化碳后得到的氢气可以作为合成氨的原料。甲烷在高温下热解生成乙炔;在氨存在下部分氧化生成氢氰酸: 甲烷在光照或加热下与氯作用,生成一氯甲烷;一氯甲烷继续氯化,生成二氯甲烷、三氯甲烷和四氯化碳,控制反应条件,可使某种氯化物为主要产物。甲烷在气相与硝酸作用,生成硝基甲烷: CH4+HNO3→CH3NO2+H2O |
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