常见可燃气体含量不同单位下换算

,,,,,,,,,,,

,不同单位含义及换算示例,,,,,,,,,

,单位,,含义,,,,举例,,,

,LEL,LEL,可燃蒸气、气体或粉尘与空气组成的混合物遇火源即能发生爆炸的最低浓度（可燃蒸气、气体的浓度，按体积比计算）,,,,25LEL%是指为爆炸下限的25%,,,

,VOL,VOL,:气体体积百分比，是物理单位,,,,5%VOL是指特定气体在空气中的体积占5%,,,

,ppm,ppm,气体体积百分比含量的百万分之一，无量纲常量,,,,5ppmCO是指空气中含有百万分之五的CO,,,

,mg/m³,mg/m³,一般作为空气污染物浓度的表示方法，表示每立方米空气中所含污染物的质量数,,,,表示每立方米空气中所含污染物的质量数，5000mg/m3表示每立方米空气中所含NO的质量为5000mg即5g,,,

,LEL换算成ppm,LEL换算成ppm,ppm=%LEL*LEL（VOL%）*100,,,,35%LEL的甲烷，它的LEL为2VOL%，按ppm显示为35（%LEL）*2（VOL%）*100=7000ppm,,,

,LEL换算成VOL,LEL换算成VOL,VOL%=%LEL*LEL（VOL%）/100,,,,"如甲烷的爆炸下限是5%VOL，所以10LEL的甲烷气体有以下对应关系

10%LEL=5000ppm=0.5%VOL",,,

,ppm换算成mg/m3,ppm换算成mg/m3,"mg/m3=M/22.4·ppm·[273/(273+T)]*（Ba/101325）

M-气体分子量，

ppm-测定的体积浓度值

T-温度

Ba-压力",,,,"如5000ppm的甲烷，因甲烷分子量约为26，

则26/22.4*5000=5822mg/m3",,,

,四者关系,,一般来说VOL是数量级最大的；LEL用于测爆的场合；ppm用于较为精准的测量，ppm和VOL数值相差10000倍。mg/m³多用来表示空气污染物浓度,,,,,,,

,不同可燃气体单位换算关系,,,,,,,,,

,气体,化学式,"爆炸下限

(体积分数)","爆炸上限

（体积分数）",分子量,"气体浓度

LEL",按VOL,按ppm,"按mg/m3

（0℃常压）","按g/m3

（0℃常压）"

,甲烷,CH4,5.0%,15.0%,26.083,10.0%,0.5%,5000,5822.1,5.822

,乙烷,C2H4,3.0%,15.5%,30.070,10.0%,0.3%,3000,4027.2,4.027

,丙烷,C3H8,2.2%,9.5%,44.096,1.0%,0.0%,220,433.1,0.433

,丁烷,C4H10,1.9%,8.5%,58.120,10.0%,0.2%,1900,4929.8,4.930

,氢,H2,4.0%,75.0%,2.016,10.0%,0.4%,4000,360.0,0.360

,异丁烷,C4H10,1.9%,8.4%,58.120,10.0%,0.2%,1900,4929.8,4.930

,一氧化碳,C0,12.5%,74.0%,28.010,10.0%,1.3%,12500,15630.6,15.631

,硫化氢,H2S,4.3%,45.0%,34.082,10.0%,0.4%,4300,6542.5,6.543

,乙醇,C2H5OH,3.4%,19.0%,46.070,10.0%,0.3%,3400,6992.8,6.993

,乙烯,C2H4,2.8%,32.0%,28.060,10.0%,0.3%,2800,3507.5,3.508

,乙炔,C2H2,1.5%,100.0%,26.040,10.0%,0.2%,1500,1743.8,1.744

,乙醛,CH3OH,4.0%,57.0%,44.053,10.0%,0.4%,4000,7866.6,7.867

,甲醇,CH3OH,5.5%,44.0%,32.040,10.0%,0.6%,5500,7867.0,7.867

,丙醇,C3H8,2.2%,13.5%,60.100,10.0%,0.2%,2200,5902.7,5.903

,丙烯,C3H6,2.4%,10.3%,42.080,5.0%,0.1%,1200,2254.3,2.254

,氨,NH3,15.0%,30.2%,17.031,10.0%,1.5%,15000,11404.7,11.405

,苯,C6H6,1.2%,8.0%,78.110,5.0%,0.1%,600,2092.2,2.092

,苯乙烯,C8H8,1.1%,8.0%,104.150,5.0%,0.1%,550,2557.3,2.557

,氯乙烯,C3H3CL,3.8%,31.0%,62.498,5.0%,0.2%,1900,5301.2,5.301

,一氯甲烷,CH3CL,8.1%,17.4%,50.490,10.0%,0.8%,8100,18257.5,18.258

,二氯甲烷,CH2CL2,15.5%,66.4%,8