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可(ke)燃(ran)氣體
衡量可燃(ran)氣(qi)(qi)(qi)(qi)體(ti)(ti)發生(sheng)爆(bao)炸(zha)的(de)(de)(de)(de)指標是(shi)爆(bao)炸(zha)極限,分為爆(bao)炸(zha)下限(LEL,Lower Explosive Limit)和爆(bao)炸(zha)上限UEL (Lower Explosive Limit)。低于爆(bao)炸(zha)下限,混合氣(qi)(qi)(qi)(qi)中的(de)(de)(de)(de)可燃(ran)氣(qi)(qi)(qi)(qi)的(de)(de)(de)(de)含量不足,不能引起燃(ran)燒或爆(bao)炸(zha);高于上限混合氣(qi)(qi)(qi)(qi)中的(de)(de)(de)(de)氧氣(qi)(qi)(qi)(qi)的(de)(de)(de)(de)含量不足,也不能引起燃(ran)燒或爆(bao)炸(zha)。LEL和UEL之(zhi)間的(de)(de)(de)(de)濃(nong)度表(biao)示可燃(ran)性氣(qi)(qi)(qi)(qi)體(ti)(ti)爆(bao)炸(zha)危險程度。
由于(yu)各種可燃(ran)性氣(qi)體(ti)的(de)(de)爆(bao)(bao)(bao)(bao)炸(zha)極(ji)限(xian)濃(nong)(nong)(nong)度(du)(du)(du)有很(hen)(hen)大差(cha)異,例如甲烷(wan)(wan)的(de)(de)爆(bao)(bao)(bao)(bao)炸(zha)下限(xian)濃(nong)(nong)(nong)度(du)(du)(du)為(wei)(wei)(wei)5%VOL,一(yi)氧化碳(tan)的(de)(de)爆(bao)(bao)(bao)(bao)炸(zha)下限(xian)濃(nong)(nong)(nong)度(du)(du)(du)為(wei)(wei)(wei)12.5%VOL,很(hen)(hen)難統(tong)一(yi)用濃(nong)(nong)(nong)度(du)(du)(du)表(biao)(biao)示(shi)(shi),所以爆(bao)(bao)(bao)(bao)炸(zha)極(ji)限(xian)值(zhi)(zhi)根據體(ti)積(ji)百(bai)分(fen)比濃(nong)(nong)(nong)度(du)(du)(du)換(huan)算為(wei)(wei)(wei)相對的(de)(de)百(bai)分(fen)比來(lai)表(biao)(biao)示(shi)(shi),取值(zhi)(zhi)范圍從0%~100%,表(biao)(biao)示(shi)(shi)為(wei)(wei)(wei)0%LEL~100%LEL,低于(yu)0%LEL肯定(ding)不(bu)會發生(sheng)爆(bao)(bao)(bao)(bao)炸(zha),達到或(huo)高于(yu)100%LEL時如遇(yu)火(huo)源則肯定(ding)發生(sheng)爆(bao)(bao)(bao)(bao)炸(zha),在0%LEL到100%LEL之間的(de)(de)數值(zhi)(zhi)與發生(sheng)爆(bao)(bao)(bao)(bao)炸(zha)的(de)(de)危險程度(du)(du)(du)成正比,例如當(dang)甲烷(wan)(wan)濃(nong)(nong)(nong)度(du)(du)(du)為(wei)(wei)(wei)5%VOL及一(yi)氧化碳(tan)濃(nong)(nong)(nong)度(du)(du)(du)為(wei)(wei)(wei)12.5%VOL時都表(biao)(biao)示(shi)(shi)為(wei)(wei)(wei)100%LEL,濃(nong)(nong)(nong)度(du)(du)(du)分(fen)別(bie)為(wei)(wei)(wei)2.5%VOL和6.25%VOL時都表(biao)(biao)示(shi)(shi)為(wei)(wei)(wei)50%LEL,雖(sui)然(ran)二者(zhe)的(de)(de)濃(nong)(nong)(nong)度(du)(du)(du)值(zhi)(zhi)不(bu)同,但爆(bao)(bao)(bao)(bao)炸(zha)危險性是相同的(de)(de)。
有毒氣體
表示有毒有害氣體危險程度的參(can)數主(zhu)要有以下指標(biao):
以上數據主要針(zhen)對工業生產場所,而對于(yu)民用室內空氣質量,其標準要更加嚴(yan)格。
有毒(du)氣體(ti) | TWA (mg/m3) | STEL (mg/m3) | MAC (mg/m3) | 室內(nei)空氣標準(zhun) (mg/m3) |
---|---|---|---|---|
一氧化碳CO | 20 | 30 | - | 10 |
硫化氫H2S | - | - | 10 | - |
二(er)氧(yang)化硫SO2 | 5 | 10 | - | 0.5 |
二氧化氮(dan)NO2 | 5 | 10 | - | 0.24 |
氨氣NH3 | 20 | 30 | - | 0.2 |
Cl2 | - | - | 1 | - |
氰化氫HCH | - | - | 1 | - |
磷(lin)化氫PH3 | - | - | 0.3 | - |
苯 | 6 | 10 | - | 0.11 |
TVOC | - | - | - | 0.6 |
以上數(shu)據來源于:
GBZ 2.1-2007 工(gong)作場所(suo)有害因(yin)素(su)職業接觸限(xian)值
GBZT 210.1-2008 職(zhi)業衛(wei)生標(biao)準制定指南
GBZT 223-2009工(gong)作場(chang)所有毒氣體檢測報警裝置設置規范
GB 12710-2008 焦化(hua)安全規(gui)程
GB-T 18883-2002 室內空氣質量標準
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