不(bu)同(tong)危(wei)險(xian)環(huan)(huan)境(jing)(jing)(jing)應當選用(yong)不(bu)同(tong)類(lei)型的(de)(de)(de)防爆(bao)(bao)(bao)電氣設備,并采(cai)用(yong)不(bu)同(tong)的(de)(de)(de)防爆(bao)(bao)(bao)措(cuo)施。因此,首先必須(xu)正(zheng)確劃分所在環(huan)(huan)境(jing)(jing)(jing)危(wei)險(xian)區(qu)域的(de)(de)(de)大小(xiao)(xiao)和(he)(he)級別。 門)氣體、蒸氣爆(bao)(bao)(bao)炸危(wei)險(xian)環(huan)(huan)境(jing)(jing)(jing)根據爆(bao)(bao)(bao)炸性(xing)氣體混合(he)物出(chu)現的(de)(de)(de)頻繁程度(du)和(he)(he)持續時間將此類(lei)危(wei)險(xian)環(huan)(huan)境(jing)(jing)(jing)分為0,區(qu)、1區(qu)和(he)(he)2區(qu)。危(wei)險(xian)區(qu)域的(de)(de)(de)大小(xiao)(xiao)受通風條件、釋放源(yuan)特征和(he)(he)危(wei)險(xian)物品性(xing)能參數的(de)(de)(de)影響(xiang)。
①0區(qu)(0級危(wei)險區(qu)域(yu))指正常運(yun)行時(shi)連續出(chu)現(xian)(xian)或長時(shi)間(jian)(jian)出(chu)現(xian)(xian)或短時(shi)間(jian)(jian)頻繁(fan)出(chu)現(xian)(xian)爆炸(zha)性氣體(ti)、蒸(zheng)氣或薄霧的區(qu)域(yu)。除有危(wei)險物質的封閉空間(jian)(jian)(如密閉容器內部(bu)(bu)空間(jian)(jian)、固定頂液體(ti)貯罐(guan)內部(bu)(bu)空間(jian)(jian)等(deng))以外,很少存在(zai)0區(qu)。
②1區(qu)(1級危險(xian)區(qu)域(yu))指正常(chang)運行時預計周期性出(chu)(chu)現(xian)(xian)或偶(ou)然出(chu)(chu)現(xian)(xian)爆炸性氣(qi)體、蒸氣(qi)或薄(bo)霧的區(qu)域(yu)。 ③2區(qu)(2級危險(xian)區(qu)域(yu))指正常(chang)運行時不出(chu)(chu)現(xian)(xian),即使出(chu)(chu)現(xian)(xian)也只是(shi)短時間偶(ou)然出(chu)(chu)現(xian)(xian)爆炸性氣(qi)體、蒸氣(qi)或薄(bo)霧的區(qu)域(yu)。
電氣(qi)(qi)(qi)(qi)的(de)(de)(de)爆(bao)(bao)炸(zha)是與火(huo)災(zai)有聯系的(de)(de)(de),發(fa)生火(huo)災(zai)的(de)(de)(de)同時(shi)發(fa)生爆(bao)(bao)炸(zha)。因(yin)此,防(fang)爆(bao)(bao)安全除(chu)按防(fang)火(huo)安全要求外應(ying)(ying)(ying)當(dang)(dang)根據(ju)安裝地點(dian)的(de)(de)(de)危(wei)(wei)(wei)險(xian)(xian)等級、危(wei)(wei)(wei)險(xian)(xian)物(wu)質(zhi)的(de)(de)(de)組(zu)別(bie)(bie)(bie)和(he)級別(bie)(bie)(bie)、電氣(qi)(qi)(qi)(qi)設(she)(she)備(bei)(bei)的(de)(de)(de)種類(lei)和(he)使用(yong)條件(jian)選用(yong)爆(bao)(bao)炸(zha)危(wei)(wei)(wei)險(xian)(xian)環(huan)境(jing)(jing)的(de)(de)(de)電氣(qi)(qi)(qi)(qi)設(she)(she)備(bei)(bei)。所選用(yong)電氣(qi)(qi)(qi)(qi)設(she)(she)備(bei)(bei)的(de)(de)(de)組(zu)別(bie)(bie)(bie)和(he)級別(bie)(bie)(bie)不應(ying)(ying)(ying)低于該環(huan)境(jing)(jing)中危(wei)(wei)(wei)險(xian)(xian)物(wu)質(zhi)的(de)(de)(de)組(zu)別(bie)(bie)(bie)和(he)級別(bie)(bie)(bie)。當(dang)(dang)存在(zai)兩種以(yi)上危(wei)(wei)(wei)險(xian)(xian)物(wu)質(zhi)時(shi),應(ying)(ying)(ying)按危(wei)(wei)(wei)險(xian)(xian)程度(du)較高(gao)的(de)(de)(de)危(wei)(wei)(wei)險(xian)(xian)物(wu)質(zhi)選用(yong)。在(zai)爆(bao)(bao)炸(zha)危(wei)(wei)(wei)險(xian)(xian)環(huan)境(jing)(jing),應(ying)(ying)(ying)盡(jin)量少(shao)用(yong)或不用(yong)攜(xie)帶式(shi)電氣(qi)(qi)(qi)(qi)設(she)(she)備(bei)(bei),應(ying)(ying)(ying)盡(jin)量少(shao)安裝插(cha)銷座。 防(fang)爆(bao)(bao)電氣(qi)(qi)(qi)(qi)線路(lu)的(de)(de)(de)安裝在(zai)爆(bao)(bao)炸(zha)危(wei)(wei)(wei)險(xian)(xian)環(huan)境(jing)(jing)和(he)火(huo)災(zai)危(wei)(wei)(wei)險(xian)(xian)環(huan)境(jing)(jing),電氣(qi)(qi)(qi)(qi)線路(lu)的(de)(de)(de)安裝位置(zhi)、敷設(she)(she)方(fang)式(shi)、導(dao)線材質(zhi)、連接方(fang)法等均應(ying)(ying)(ying)與區(qu)域危(wei)(wei)(wei)險(xian)(xian)等級相適應(ying)(ying)(ying)。 防(fang)爆(bao)(bao)安全技(ji)術