煤堆自燃升温规律与漏风特征的数值模拟

发布时间：2018-08-06 15:59

【摘要】：为了研究露天煤堆内部的漏风分布特征以及漏风特征对煤自燃升温的影响,在考虑风压、热压和质量扩散等驱动力的情况下建立了二维干燥煤堆传热传质数学模型,利用FLUENT软件对煤堆内部漏风分布与升温规律进行分析。计算结果表明:煤堆在迎风面漏风风速最高,背风面最低,中间递减,高温区位于迎风坡附近漏风强度适中,氧气充足的蓄热区。大气风速越低煤堆升温速率越慢,低于临界风速,煤堆可以安全存放。风速较高时,风速对煤堆自燃的影响主要体现在高温区位置,而非升温速率。现场可根据风速、煤堆松散度、堆放方式等因素事先评估自燃危险性,以便及时采取措施,提高防火工作效率。
[Abstract]:In order to study the air leakage distribution characteristics and the influence of air leakage characteristics on coal spontaneous combustion temperature, a mathematical model of heat and mass transfer of a two-dimensional dry coal reactor was established considering the driving forces such as wind pressure, hot pressure and mass diffusion. The distribution of air leakage and the law of temperature rise in coal pile are analyzed by FLUENT software. The results show that the coal pile has the highest wind speed on the upwind surface, the lowest at the leeward surface and the decreasing in the middle, and the high temperature area is located in the heat storage area with moderate leakage intensity and abundant oxygen near the upwind slope. The lower the atmospheric wind speed, the slower the heating rate of coal heap is, and the lower the critical wind speed, the safer the coal pile can be stored. When the wind speed is high, the influence of wind speed on spontaneous combustion of coal pile is mainly reflected in the high temperature area, not the heating rate. The spontaneous combustion risk can be evaluated in advance according to wind speed, coal pile looseness, stacking mode and so on, in order to take measures in time and improve the efficiency of fire prevention.
【作者单位】：河南理工大学能源科学与工程学院;河南工程学院安全工程系;河南省高校重点实验室培训基地;
【基金】：河南省科技攻关项目(132102210448)
【分类号】：TD752.2

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