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Experimental and simulation study on preheating pulverized coal and air flow by a heat exchanger using thermal oil

机译：热油预热粉煤和空气流动的实验和仿真研究

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摘要

Utility boilers consume a lot of fuel oil during the startup and low-load operation, which leads to the rise of power generation costs and environmental pollution problems. A finned shell-and-tube heat exchanger is proposed to preheat pulverized coal and air flow using thermal oil. Pilot-scale heat exchange tests were carried out to study the effects of the oil temperature, air temperature, air velocity, oil flow rate, coal-air ratio on the preheating performance and resistance properties of the system. Meanwhile, Computational fluid dynamic (CFD) numerical simulations were conducted. The tests verified the technical feasibility of the heat exchanger using thermal oil to preheat the primary air. The proposed preheating process is conducive to environmental protection and energy-saving. The test results show that when the coal-to-air ratio is 0.15, the 190 ?C of thermal oil can preheat the pulverized coal and air flow from 65.2 ?C to above 115 ?C. This preheating process will improve the ignition performance of the pulverized coal and air flow, which is favorable for startup and stable operation of the pulverized coal boiler, particularly when the boiler load is low.
机译：公用事业锅炉在启动和低负荷运行期间消耗了大量燃料油，从而导致发电成本和环境污染问题的兴起。提出了一种翅片的壳管热交换器，用于使用热油预热粉煤和空气流量。进行试验级热交换试验，以研究油温，空气温度，空气速度，油流速，煤气比对系统的预热性能和耐药性的影响。同时，进行了计算流体动态（CFD）数值模拟。测试验证了热交换器使用热油来预热初级空气的技术可行性。提出的预热过程有利于环保和节能。试验结果表明，当煤至空比为0.15时，热油的190℃可以将粉煤和空气流量从65.2℃预热至115℃。该预热过程将提高粉煤和空气流的点火性能，这有利于粉煤泵的启动和稳定运行，特别是当锅炉负荷低时。

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  • 来源
    《Fuel》 |2021年第15期|120417.1-120417.11|共11页
  • 作者

    Lai Zhenya; Zhou Hao; Li Yuan; Zhang Pingan; Mao Rui; Ren Liming; Zhou Mingxi;

  • 作者单位

    Zhejiang Univ Inst Thermal Power Engn State Key Lab Clean Energy Utilizat Hangzhou 310027 Peoples R China;

    Zhejiang Univ Inst Thermal Power Engn State Key Lab Clean Energy Utilizat Hangzhou 310027 Peoples R China;

    Rundian Energy Sci & Technol Co Ltd Zhengzhou 450052 Peoples R China;

    Rundian Energy Sci & Technol Co Ltd Zhengzhou 450052 Peoples R China;

    Rundian Energy Sci & Technol Co Ltd Zhengzhou 450052 Peoples R China;

    Rundian Energy Sci & Technol Co Ltd Zhengzhou 450052 Peoples R China;

    Zhejiang Univ Inst Thermal Power Engn State Key Lab Clean Energy Utilizat Hangzhou 310027 Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Utility boiler; Pulverized coal; Preheat; Heat exchanger; Ignition characteristics;

    机译：公用事业锅炉;煤粉;预热;换热器;点火特性;

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