• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2019, Vol. 55 ›› Issue (10): 185-197.doi: 10.3901/JME.2019.10.185

• 可再生能源与工程热物理 • 上一篇    下一篇

设置0号高压加热器对超临界直流锅炉排烟温度的定量影响模型

李勇1, 王艳红1, 曹丽华1, 胡鹏飞1, 宁哲2, 董恩伏3   

  1. 1. 东北电力大学能源与动力工程学院 吉林 132012;
    2. 西安热工研究院有限公司 西安 710054;
    3. 国网辽宁省电力有限公司 沈阳 110804
  • 收稿日期:2018-05-21 修回日期:2019-01-21 出版日期:2019-05-20 发布日期:2019-05-20
  • 通讯作者: 王艳红(通信作者),男,1985年出生,博士研究生,讲师。主要研究方向为电站锅炉热经济性诊断及优化运行。E-mail:wangyanhong1985@126.com
  • 作者简介:李勇,男,1964年出生,教授,博士研究生导师。主要研究方向为火电机组经济性诊断及优化运行。E-mail:liyong6883@163.com
  • 基金资助:
    国家重点研发计划(2017YFB0902100)、国家自然科学基金(51576036)和吉林市科技创新发展计划(201750236)资助项目

Quantitative Effect Model of Setting No.0 High Pressure Heater on Exhaust Flue Gas Temperature of Supercritical Once-through Boiler

LI Yong1, WANG Yanhong1, CAO Lihua1, HU Pengfei1, NING Zhe2, DONG Enfu3   

  1. 1. School of Energy and Power Engineering, Northeast Dianli University, Jilin 132012;
    2. Xi'an Thermal Power Research Institute Co., Ltd., Xi'an 710054;
    3. State Grid Liaoning Electric Power Supply Co., Ltd., Shenyang 110804
  • Received:2018-05-21 Revised:2019-01-21 Online:2019-05-20 Published:2019-05-20

摘要: 目前超临界机组设置0号高压加热器后给水温度和锅炉排烟温度之间的函数关系及其影响机理尚不清楚,这不仅对火电机组设置0号高压加热器后机组性能的评价造成了障碍,也不利于超临界机组运行参数的调整和机组性能的优化。通过建立超临界机组给水温度和锅炉排烟温度之间的定量分析模型,给出超临界机组给水温度变化后引起燃料量、排烟温度、SCR入口烟温及锅炉热效率的变化关系和相互影响机理,同时给出锅炉燃料量和给水温度分别对锅炉排烟温度的定量影响程度和影响机理。结果指明,在不同的给水温度变化范围,排烟温度对燃料量和给水温度变化的敏感程度不同。在75% BMCR和100% BMCR工况,当给水温度升高值低于40℃时,锅炉排烟温度随给水温度升高而增加,之后随着给水温度的继续升高,受燃料量大幅下降的影响,锅炉排烟温度又会降低。而在50% BMCR和30% BMCR工况,排烟温度和给水温度的变化趋势一致。所得结论澄清了超临界机组给水温度对排烟温度的影响程度及其影响机理,对于设置0号高压加热器后机组性能的评价奠定了理论基础。

关键词: 分析模型, 给水温度, 锅炉效率, 排烟温度, 直流锅炉

Abstract: At present, the functional relationship between the feed water temperature and the exhaust flue gas temperature of boiler after the installation of No. 0 high-pressure heater of supercritical unit and its influencing mechanism are still unclear. This not only causes obstacles to the performance evaluation of thermal power unit with No. 0 high-pressure heater, but also is not conducive to the adjustment of operation parameters of supercritical unit and the optimization of unit performance. A quantitative analysis model of supercritical unit between feed water temperature and exhaust flue gas temperature of boiler is established, the relationship between the change of feed water temperature of supercritical units and the changes of fuel quantity, exhaust flue gas temperature, SCR inlet flue gas temperature and boiler thermal efficiency and their interaction mechanism are given. Meanwhile, the quantitative influence degree and influence mechanism of boiler fuel quantity and feed water temperature on exhaust flue gas temperature are given respectively. The results show that the flue gas temperature has different sensitivity to the changes of fuel quantity and feed water temperature in different range of feed water temperature. At 75% BMCR and 100% BMCR conditions, when the increase value of feed water temperature is lower than 40℃, the exhaust flue gas temperature of boiler increases with the increase of feed water temperature, afterwards, as the feed water temperature continues to rise, the exhaust flue gas temperature of boiler will decrease due to the dramatic decrease of fuel quantity. At 50% BMCR and 30% BMCR, the change trend of exhaust flue gas temperature and feed water temperature is the same. The conclusion clarifies the influence degree and mechanism of the feed water temperature on the exhaust gas temperature of supercritical units, and lays a theoretical foundation for the performance evaluation of supercritical unit after the installation of No. 0 high-pressure heater.

Key words: analysis model, boiler efficiency, exhaust flue gas temperature, feed water temperature, once-through boiler

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