点火能量对粉尘爆炸行为的影响

蒯念生; 黄卫星; 袁旌杰; 杜兵; 李宗珊; 伍毅

doi:10.11883/1001-1455(2012)04-0432-07

点火能量对粉尘爆炸行为的影响

doi: 10.11883/1001-1455(2012)04-0432-07

1.
四川大学化学工程学院,四川成都610065

详细信息

通讯作者:
黄卫星

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出版历程
- 刊出日期: 2012-07-25

Influenceofignitionenergyondustexplosionbehavior

1.
SchoolofChemicalEngineering,SichuanUniversity,Chengdu610065,Sichuan,China

More Information

Corresponding author: HUANG Wei-xing

摘要

摘要: 为防控工业粉尘爆炸和完善粉尘爆炸测试方法,在Siwek20L球形爆炸测试系统内,实验研究了不同点火能量下高、低挥发性粉尘的爆炸行为。对粉尘爆炸猛度(最大爆炸压力、最大升压速率和燃烧持续时间)、敏感度(爆炸下限)及惰性介质的抑爆效力随点火能量的变化规律进行了重点探讨。结果表明,增加点火能量能提高粉尘云爆炸能量和燃烧速率,低挥发性粉尘爆炸行为受点火能量的影响更显著。低挥发性粉尘在低质量浓度下无法被低点火能量充分引燃,爆炸不良效应显著;随着粉尘质量浓度的增加,爆炸不良效应不断减弱直至消失。低挥发性粉尘爆炸下限随点火能量增加急剧下降,而高挥发性粉尘爆炸下限受点火能量影响较小。惰性介质抑爆效力随点火能量增加而下降。建议采用5~10kJ点火能量考察低挥发性粉尘爆炸下限及惰性介质对粉尘爆炸的抑制效力。研究结果有助于理解粉尘爆炸规律、完善测试方法和安全设计。
- 爆炸力学 /
- 点火能量 /
- 爆炸不良效应 /
- 粉尘爆炸 /
- 挥发性 /
- 爆炸下限
Abstract: Inordertopreventandcontrolindustrialdustexplosionandimprovetheaccuracyofdust explosiontests,anexperimentalresearchwascarriedouttohaveaninsightintotheexplosionbehaviorofhigh- andlow-volatiledustsinducedbydifferentignitionenergiesbyusingaSiwek20Lsphericalexplosiontestsystem. Ignitionenergyeffectondustexplosionbrisance(max.explosionpressure, max.pressurerisingrateandcombustionduration)andsensitivity (lowerexplosionlimit)andthe variationofexplosionsuppressioneffectivenessofinertsubstancealongwiththeignitionenergywere explored.Resultsshowthathigherignitionenergyimprovestheexplosionenergyreleaseandcombustionrateofdustcloud; theeffectofignitionenergyonexplosionbehaviorismoresignificantforless volatiledust.Incompletedeflagrationoflow-volatiledustundertheconditionoflowignitionenergy resultsintheadverseeffectofexplosion.Theadverseeffectofexplosionbecomesinconspicuousas thedustconcentrationincreases.Thelowerexplosionlimitdecreasessharplywiththeriseofignition energyforlow-volatiledust,whilethelowerexplosionlimitofhigh-volatiledustisnotsosensitiveto ignitionenergy.Moreover,explosionsuppressioneffectivenessofinertsubstancedecreaseswiththe riseofignitionenergy.Theignitionenergyof5~10kJisthemostappropriateforunderstandingthe lowerexplosionlimitoflow-volatiledustandtheexplosionsuppressioneffectivenessofinertsubstance. Theaboveresultsmaybevaluableforunderstandingthedustexplosioncharacteristicsand completingthecurrentdustexplosioncharacteristicstestandsafetydesign.
- mechanicsofexplosion /
- ignitionenergy /
- adverseeffectofexplosion /
- dustexplosion /
- volatility /
- lowerexplosionlimi