东北大学学报（自然科学版）
東北大學學報（自然科學版）
동북대학학보（자연과학판）
JOURNAL OF NORTHEASTERN UNIVERSITY（NATURAL SCIENCE）
2015年
9期
1316-1320
,共5页
粉尘爆炸%泄放设计%静态动作压力%最大泄爆压力%泄放关系式
粉塵爆炸%洩放設計%靜態動作壓力%最大洩爆壓力%洩放關繫式
분진폭작%설방설계%정태동작압력%최대설폭압력%설방관계식
dust explosion%venting design%static activation overpressure%maximum reduced overpressure%venting correlation
粉尘爆炸泄放设计标准的可靠性对能否实现爆炸防护尤为关键.以中径70μm 石松子粉尘为介质,采用20 L 球形粉尘爆炸装置进行了4种泄放口径、静态动作压力在0.12~0.6 MPa 的爆炸泄放实验,对比了实验值与 NFPA 68和 EN 14491计算值.结果表明,NFPA 68在预测高静态动作压力下的泄放面积时,随着泄放口径的增大,预测结果由保守变为危险,但预测结果精度较好且数值稳定；EN 14491在预测高静态动作压力下的泄放面积时非常保守,预测精度较差,数据不可靠.依据两种标准推荐的经验函数关系,分析了NFPA 68和 EN 14491在预测高静态动作压力时产生这种差异的原因.
粉塵爆炸洩放設計標準的可靠性對能否實現爆炸防護尤為關鍵.以中徑70μm 石鬆子粉塵為介質,採用20 L 毬形粉塵爆炸裝置進行瞭4種洩放口徑、靜態動作壓力在0.12~0.6 MPa 的爆炸洩放實驗,對比瞭實驗值與 NFPA 68和 EN 14491計算值.結果錶明,NFPA 68在預測高靜態動作壓力下的洩放麵積時,隨著洩放口徑的增大,預測結果由保守變為危險,但預測結果精度較好且數值穩定；EN 14491在預測高靜態動作壓力下的洩放麵積時非常保守,預測精度較差,數據不可靠.依據兩種標準推薦的經驗函數關繫,分析瞭NFPA 68和 EN 14491在預測高靜態動作壓力時產生這種差異的原因.
분진폭작설방설계표준적가고성대능부실현폭작방호우위관건.이중경70μm 석송자분진위개질,채용20 L 구형분진폭작장치진행료4충설방구경、정태동작압력재0.12~0.6 MPa 적폭작설방실험,대비료실험치여 NFPA 68화 EN 14491계산치.결과표명,NFPA 68재예측고정태동작압력하적설방면적시,수착설방구경적증대,예측결과유보수변위위험,단예측결과정도교호차수치은정；EN 14491재예측고정태동작압력하적설방면적시비상보수,예측정도교차,수거불가고.의거량충표준추천적경험함수관계,분석료NFPA 68화 EN 14491재예측고정태동작압력시산생저충차이적원인.
The reliability of dust explosion venting standards is of great importance to explosion protection.Dust explosion venting experiments with four venting diameters under elevated static activation overpressures ranging from 0.12 to 0.6 MPa were performed in the 20-liter chamber. The lycopodium dusts with a median diameter of 70 μm were adopted.The experimental results were compared with the predictive values calculated by NFPA 68 and EN 14491 .The results indicated that NFPA 68 results tend to be conservative for small venting diameters and dangerous for larger venting diameters.It was found that the prediction results of NFPA 68 correlation have a good accuracy and are stable under elevated static activation overpressures.However,the prediction results of EN 14491 are inaccurate and unstable,which tend to be very conservative. The huge divergence between NFPA 68 and EN 14491 results under elevated static overpressures was analyzed based on the correlations of the empirical functions proposed by the standards.
