閉口(kou)杯(bei)法(fa)石油產品閃點(dian)儀實驗內容和要求

石油(you)氣或油(you)品蒸汽(qi)與(yu)空氣的混合(he)物(wu)(wu)(wu),在一定(ding)(ding)濃(nong)度(du)(du)(du)范(fan)(fan)圍(wei)內, 遇(yu)到明火(huo)能產生爆(bao)炸(zha)。如果混合(he)氣中(zhong)可燃(ran)氣體過少或過多,超出.上(shang)(shang)(shang)述濃(nong)度(du)(du)(du)范(fan)(fan)圍(wei),混合(he)物(wu)(wu)(wu)不(bu)會(hui)爆(bao)炸(zha)。此(ci)濃(nong)度(du)(du)(du)范(fan)(fan)圍(wei)稱為爆(bao)炸(zha)范(fan)(fan)圍(wei),其上(shang)(shang)(shang)限(xian)(xian)濃(nong)度(du)(du)(du)稱為爆(bao)炸(zha).上(shang)(shang)(shang)限(xian)(xian)，下限(xian)(xian)濃(nong)度(du)(du)(du)稱為爆(bao)炸(zha)下限(xian)(xian)。爆(bao)炸(zha)范(fan)(fan)圍(wei)決定(ding)(ding)于(yu)混合(he)物(wu)(wu)(wu)的化學組(zu)成和物(wu)(wu)(wu)理條(tiao)件,如測定(ding)(ding)它的方法、溫度(du)(du)(du)、壓(ya)力等。當其他(ta)條(tiao)件不(bu)變時,在石油(you)產品液面上(shang)(shang)(shang)的蒸汽(qi)濃(nong)度(du)(du)(du),決定(ding)(ding)于(yu)油(you)品的溫度(du)(du)(du)。當

蒸汽濃度達到爆(bao)炸下限(xian)(汽油(you)以外(wai)的各種產(chan)品(pin)(pin))或爆(bao)炸上限(xian)(汽油(you))時的油(you)品(pin)(pin)溫度稱為閃(shan)(shan)點(dian)由(you)于油(you)品(pin)(pin)液面上部(bu)的蒸汽濃度和爆(bao)炸限(xian)度與油(you)品(pin)(pin)溫度以外(wai)的條件(jian)如加(jia)熱溫度、蒸發(fa)速(su)度、蒸發(fa)空間的大小、勵等(deng)有(you)關(guan),所(suo)以石(shi)油(you)產(chan)品(pin)(pin)的閃(shan)(shan)點(dian)與測定儀器及操作方法(fa)有(you)密切關(guan)系,是一個條件(jian)性很強(qiang)的指標。外(wai)界壓(ya)力對閃(shan)(shan)點(dian)影響(xiang)很大,在外(wai)壓(ya)超過一定范圍時 ,需進行壓(ya)力校正。