閉(bi)口杯法石油(you)產品閃點儀實(shi)驗內容(rong)和要求

石(shi)油(you)(you)氣(qi)(qi)(qi)或(huo)油(you)(you)品(pin)蒸(zheng)汽與空氣(qi)(qi)(qi)的(de)(de)混合(he)物,在一定(ding)(ding)濃(nong)度(du)范(fan)圍內, 遇到明火能產生爆(bao)(bao)(bao)炸。如(ru)果混合(he)氣(qi)(qi)(qi)中(zhong)可燃氣(qi)(qi)(qi)體(ti)過少(shao)或(huo)過多,超出.上(shang)(shang)述濃(nong)度(du)范(fan)圍,混合(he)物不會爆(bao)(bao)(bao)炸。此濃(nong)度(du)范(fan)圍稱(cheng)(cheng)為爆(bao)(bao)(bao)炸范(fan)圍,其上(shang)(shang)限(xian)(xian)濃(nong)度(du)稱(cheng)(cheng)為爆(bao)(bao)(bao)炸.上(shang)(shang)限(xian)(xian)，下(xia)限(xian)(xian)濃(nong)度(du)稱(cheng)(cheng)為爆(bao)(bao)(bao)炸下(xia)限(xian)(xian)。爆(bao)(bao)(bao)炸范(fan)圍決定(ding)(ding)于混合(he)物的(de)(de)化學組成和(he)物理條件(jian),如(ru)測(ce)定(ding)(ding)它的(de)(de)方(fang)法、溫度(du)、壓力(li)等。當其他條件(jian)不變時,在石(shi)油(you)(you)產品(pin)液面(mian)上(shang)(shang)的(de)(de)蒸(zheng)汽濃(nong)度(du),決定(ding)(ding)于油(you)(you)品(pin)的(de)(de)溫度(du)。當

蒸汽(qi)濃度(du)達到爆炸(zha)下限(汽(qi)油以外的(de)各(ge)種產品(pin))或爆炸(zha)上(shang)限(汽(qi)油)時(shi)(shi)的(de)油品(pin)溫(wen)度(du)稱為閃點由于油品(pin)液面上(shang)部(bu)的(de)蒸汽(qi)濃度(du)和(he)爆炸(zha)限度(du)與油品(pin)溫(wen)度(du)以外的(de)條件(jian)如加熱溫(wen)度(du)、蒸發速(su)度(du)、蒸發空(kong)間的(de)大(da)小、勵等(deng)有(you)關(guan),所以石油產品(pin)的(de)閃點與測(ce)定儀器及操作方法(fa)有(you)密切關(guan)系,是一個條件(jian)性很(hen)強的(de)指標(biao)。外界壓力對閃點影響很(hen)大(da),在外壓超過一定范(fan)圍時(shi)(shi) ,需進(jin)行壓力校正。