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基于数值模拟的锥形煤仓积煤自燃特征

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煤仓自燃区域隐蔽性强、灭火难度大.为明确锥形煤仓积煤在动态堆积和风流量变化条件下对氧化自燃的影响,利用COMSOL软件建立煤斗下料期间煤斗内气固两相流动、煤炭动态滞留堆积、缓慢氧化升温的多场耦合数值仿真模型.结果表明,漏风流量在0.2~3.0 m3/h的范围内与氧气浓度的增加呈现正相关,漏入风流量越大,积煤的氧化越充分,自燃危险性越强.积煤厚度增加、漏入风流量增加,会显著提高煤斗中积煤的自燃危险.当积煤厚度大于3 m、风流量大于0.3 m3/min的条件下煤斗中积煤存在较强的自燃倾向性.
Characteristics of coal spontaneous combustion in conical coal bunker based on numerical simulation
Coal bunker self-ignition area has strong concealment and is difficult to extinguish.To clarify the influence of dy-namic stacking and changes in air volume on oxidative spontaneous combustion of coal in a conical coal bunker,a multi-field coupled numerical simulation model is developed using COMSOL software for gas-solid two-phase flow,coal dynamic reten-tion and stacking,and slow calefactive oxidation during coal hopper feeding.The results show that there is a positive correla-tion between the air leakage and the increase in oxygen concentration at the range of 0.2~3.0 m3/h of air volume.The lar-ger the air leakage volume,the more thorough the oxidation of accumulated coal,and the stronger the risk of spontaneous combustion.The increase of accumulated coal thickness and air leakage volume can significantly boost the danger of coal combustion in the coal hopper.There is a clear tendency for spontaneous combustion of the coal accumulated in the coal hopper when the accumulated coal is thicker than 3 m and the air volume is greater than 0.3 m3/h.

conical coal bunkercoal spontaneous combustioncoal accumulation thicknessair volume

钟越峰、赵婉婷、张振亚

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宁波众茂杭州湾热电有限公司,浙江宁波 315300

宁波工程学院安全工程学院,浙江宁波 315211

宁波工程学院建筑与交通工程学院,浙江宁波 315211

锥形煤仓 煤自燃 积煤厚度 风量

2024

陕西煤炭
陕西省煤炭工业协会 神华神东煤炭集团有限责任公司 陕西煤业化工集团有限责任公司

陕西煤炭

影响因子:0.204
ISSN:1671-749X
年,卷(期):2024.43(7)