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文摘
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针对电石坨冷却速度较慢的问题,应用气固换热理论与ANSYS软件,建立电石在传统冷却环境和实验冷却环境下的换热模型,并对电石冷却过程进行数值模拟,得到电石从电石锅内凝固冷却到出锅后经历自然对流与辐射换热耦合或强制对流冷却方式时温度的变化规律。结果表明,模拟结果与实验结果具有良好的一致性,以此模型为基础进行数值计算,确定了电石在实验条件下的最快冷却方式,即电石在传统冷却工艺下经历8.6 h,进入电石罩进行风冷,在电石表面平均风速为2.85 m/s时,继续冷却15.23 h后即可达到破碎要求,这使电石冷却过程较传统缩短了12.17 h。分析不同风速下电石的冷却速度,随着风速的增加,电石冷却速度加快,当冷却风速为10.5 m/s时,电石整体冷却时间为21.02 h。 |
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其他语种文摘
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For the slow cooling rate of calcium carbide,a heat transfer model of calcium carbide is built based on fluid-solid heat transfer theory and ANSYS numerical simulation. The heat transfer process of calcium carbide under different cooling conditions is studied, from the solidification in pot to the forced convection cooling or coupled cooling by natural convection and radiation,and the temperature variation trend of calcium carbide is obtained. According to the field experiment in a calcium carbide factory in northwestern China, the trend of calcium carbide temperature variation is validated in the ANSYS simulation. With this validated model, the optimum cooling time can be determined by the numerical calculation. That is,after 8.6 hours of cooling time in traditional mode, the calcium carbide is delivered to the windcooling device. And then with 2.85 m/s of the average wind velocity on the calcium carbide surface of, and 15.23 hours of wind cooling, the calcium carbide can meet the requirement of crush. The cooling time is saved by 12.17 hours with this optimum condition,compared to the traditional method. Furthermore, the cooling rate of calcium carbide under different wind speeds is also analyzed by this model. The results show that the cooling rate of calcium carbide accelerates with wind speed. When the cooling wind speed is 10.5m/s, the entire cooling time of calcium carbide is 21.02 h. |
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来源
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热能动力工程
,2018,33(11):81-86 【扩展库】
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DOI
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10.16146/j.cnki.rndlgc.2018.11.013
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关键词
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电石
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数值模拟
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区域网格
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温度场
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地址
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1.
(保定)华北电力大学能源动力与机械工程学院, 河北, 保定, 071003
2.
中国科学院大学工程科学学院, 北京, 100049
3.
中国科学院力学研究所, 北京, 100190
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1001-2060 |
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学科
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能源与动力工程 |
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基金
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国家重点研发计划
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文献收藏号
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CSCD:6404445
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