你知道開口閃點(dian)試驗(yan)儀的實驗(yan)原理嗎

實驗原理︰

按照所用閃(shan)(shan)(shan)(shan)點(dian)測(ce)(ce)(ce)定器的(de)型式,閃(shan)(shan)(shan)(shan)點(dian)可分為閉(bi)(bi)口閃(shan)(shan)(shan)(shan)點(dian)和(he)開(kai)口閃(shan)(shan)(shan)(shan)點(dian)兩種。每種油(you)(you)品是(shi)測(ce)(ce)(ce)閉(bi)(bi)口閃(shan)(shan)(shan)(shan)點(dian)還是(shi)測(ce)(ce)(ce)開(kai)口閃(shan)(shan)(shan)(shan)點(dian)要按產品質(zhi)量(liang)指標規定進行。一般地,蒸(zheng)發(fa)性較大的(de)石油(you)(you)產品多(duo)測(ce)(ce)(ce)閉(bi)(bi)口閃(shan)(shan)(shan)(shan)點(dian),因為測(ce)(ce)(ce)定開(kai)口閃(shan)(shan)(shan)(shan)點(dian)時,油(you)(you)品受熱后所形成的(de)蒸(zheng)氣(qi)(qi)不斷向周(zhou)圍空氣(qi)(qi)擴散,使測(ce)(ce)(ce)得的(de)閃(shan)(shan)(shan)(shan)點(dian)偏高。對多(duo)數(shu)潤滑油(you)(you)及重質(zhi)油(you)(you),由于(yu)蒸(zheng)發(fa)性小,則多(duo)測(ce)(ce)(ce)開(kai)口閃(shan)(shan)(shan)(shan)點(dian)。

閉(bi)口閃點(dian)的(de)測定原(yuan)理是把試(shi)樣裝入(ru)(ru)油(you)杯中(zhong)(zhong)到(dao)環狀標記處,把試(shi)樣在連續攪(jiao)拌下用很慢的(de)、恒定的(de)速度加熱,在規(gui)定的(de)溫度間隔,同時中(zhong)(zhong)斷(duan)攪(jiao)拌的(de)情況下,將(jiang)一小火焰(yan)引(yin)入(ru)(ru)杯中(zhong)(zhong),試(shi)驗火焰(yan)引(yin)起試(shi)樣上的(de)蒸(zheng)氣閃火時的(de)zui低溫度作(zuo)為閉(bi)口閃點(dian)。

開口(kou)閃(shan)(shan)點(dian)測定(ding)原(yuan)理是(shi)把(ba)試樣(yang)裝入(ru)試驗杯中到規定(ding)的(de)刻線。首先升(sheng)(sheng)高試樣(yang)的(de)溫度,然(ran)后緩慢升(sheng)(sheng)溫,當接近閃(shan)(shan)點(dian)時,恒速升(sheng)(sheng)溫。在規定(ding)的(de)溫度間隔,以一個小的(de)試驗火焰(yan)橫著通(tong)過(guo)試杯,用試驗火焰(yan)使液體表面上的(de)蒸氣發(fa)生點(dian)火的(de)zui低(di)溫度作(zuo)為開口(kou)閃(shan)(shan)點(dian)的(de)測定(ding)結果。