大型水泥分解炉O_2/CO_2燃烧的数值模拟研究
Numerical simulation of O_2/CO_2 combustion in large cement precalciner
查看参考文献27篇
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文摘
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水泥行业是CO_2排放量仅次于电力行业的第二大源头, CO_2引起的温室效应正不断加剧,因此CO_2减排刻不容缓,水泥炉窑O_2/CO_2燃烧技术在CO_2减排方面具有很大的应用价值.本文选取3200 t/d水泥生产线TTF型分解炉为研究对象,采用天河二号超级计算机,开展大规模并行计算CFD仿真数值模拟,研究了煤粉混合空气燃烧与煤粉混合O_2/CO_2燃烧对炉内速度场、温度场、物料组分分布及NOx浓度分布的影响.结果表明: O_2/CO_2燃烧技术与常规空气助燃方式相比,炉内速度场分布及生料分解率基本一致,不会影响分解炉的正常工作,而且炉内超温区域减少,高温刷墙现象得到有效缓解;同时分解炉出口排放的NOx浓度极大减少,由995 mg/m~3大幅降低至96 mg/m~3,从而可以取消后续脱硝处理工艺,节省投资;另外,分解炉出口烟气中近乎纯净的高浓度CO_2也非常有利于回收再利用,可以有效缓解温室效应. |
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其他语种文摘
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The cement industry is the second largest source of CO_2 emissions after the power industry. The greenhouse effect caused by CO_2 is increasing nowadays, so CO_2 emission reduction is urgent, the cement precalciner kiln O_2/CO_2 combustion technology has great application value in CO_2 emission reduction. This paper selects 3200 t/d TTF cement precalciner as the research object, and Tianhe-2 supercomputer is used to carry out massive parallel CFD numerical simulation. Numerical simulation was used to study on the effects of pulverized coal combustion mixed air with pulverized coal combustion mixed O_2/CO_2 on velocity field, temperature field, material composition distribution and NOx concentration distribution. The results show that the O_2/CO_2 combustion technology has similar velocity field distribution and raw material decomposition ratio when compared with the conventional air combustion, and it will not affect the operation of the precalciner. Besides, the over-temperature zone in the precalciner is reduced, the temperature-brushing phenomenon is effectively alleviated, and the NOx concentration at the outlet reduced greatly from 995 to 96 mg/m~3, so that the posttreatment De-NOx process can be removed to reduce investments. Furthermore, the nearly pure high-concentration CO_2 in the flue gas is easy to be captured and reused, alleviating the greenhouse effect. |
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来源
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中国科学. 技术科学
,2019,49(9):1080-1088 【核心库】
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DOI
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10.1360/sst-2019-0047
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关键词
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分解炉
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O_2/CO_2燃烧
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CO_2减排
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脱硝
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数值模拟
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地址
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1.
中国科学院力学研究所, 高温气体动力学国家重点实验室, 北京, 100190
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中国科学院大学工程科学学院, 北京, 100049
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(保定)华北电力大学能源动力与机械工程学院, 保定, 071000
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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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1674-7259 |
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学科
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行业污染、废物处理与综合利用 |
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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:6579438
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