高碱煤在低负荷时的着火稳燃特性研究
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摘要
建立炉膛热平衡简化模型,从进入炉膛的风粉气流着火热计算着手,研究了煤粉燃烧产生的热量不同的去向,认为只要炉膛输入热量大于其他部分利用的热量之和,低负荷下炉膛的稳燃就能得到保证,基于此,结合某330 MW机组锅炉在低负荷运行时进行了研究。结果表明,在6个不同的低负荷运行下,风粉气流的着火热能得到保障,着火热在90.85 MW时为18 395.6 kW,此时炉膛输入热量扣去其他部分的利用热量之后,还剩余10 470.8 kW,在实际机组运行中的运行数据也显示该机组在不到30%负荷下能正常运行,本文的研究具有一定的工程参考借鉴作用。
In this paper,a simplified model of heat balance in boiler furnace is established. Starting from the calculation of the heat of pulverized coal powder and air flow into the furnace,the different direction of heat produced by pulverized coal combustion is studied.It is showed that the steady combustion of the furnace can be guaranteed under the low load as long as the input heat of the furnace is greater than that of the other parts. The boiler of a 330 MW unit is studied at low load. Results show that under 6 different low load wording conditions,the heat energy of the pulverized powder and air flow are guaranteed and the fire heat is 18 395.6 kW at 90.85 MW. At this condition,the furnace input heat is buckled to other parts of the use of heat,and the remaining 10 470.8 kW is left. The actual operation of the unit also shows that 30% rated load is guaranteed. This study can be refered at low load of boiler operation.
In this paper,a simplified model of heat balance in boiler furnace is established. Starting from the calculation of the heat of pulverized coal powder and air flow into the furnace,the different direction of heat produced by pulverized coal combustion is studied.It is showed that the steady combustion of the furnace can be guaranteed under the low load as long as the input heat of the furnace is greater than that of the other parts. The boiler of a 330 MW unit is studied at low load. Results show that under 6 different low load wording conditions,the heat energy of the pulverized powder and air flow are guaranteed and the fire heat is 18 395.6 kW at 90.85 MW. At this condition,the furnace input heat is buckled to other parts of the use of heat,and the remaining 10 470.8 kW is left. The actual operation of the unit also shows that 30% rated load is guaranteed. This study can be refered at low load of boiler operation.
引文
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[10]景雪晖,陶玉洁,李涛,等.不同采矿深度准东煤物化特性和燃烧性能研究[J].能源工程,2014.1:70-74.
[11]郭朝令,徐建国.煤粉气流着火热的计算[J].河南教育学院学报:自然科学版,1999(2):35-36.
[12]丁立新.电厂锅炉原理[M].北京:中国电力出版社,2006:93-101.
[2]乌晓江,张翔,陈楠.高岭土对新疆高碱煤沾污结渣特性的影响研究[J].锅炉技术,2017,48(2):5-9.
[3]杨忠灿,刘家利,何红光.新疆准东煤特性研究及其锅炉选型[J].热力发电,2012,39(8):38-44.
[4]阎维平,徐通模,许晋源.煤粉气流着火存在最佳煤粉浓度的试验研究[J].动力工程,1994,12(4):28-32.
[5]许晋源,徐通模.燃烧学[M].北京:北京工业出版社,1979.
[6]傅维标.煤燃烧理论及其宏观通用规律[M].北京:清华大学出版社,2003.
[7]薛瑞轩,施宏波,张宁,等.两种高钠煤的掺烧结渣特性对比试验[J].煤炭学报,2017,42(11):3021-3027.
[8]魏博,文彪,谭厚章,等.准东煤掺混焦炭燃烧特性研究[J].热力发电,2017,46(6):51-55.
[9]何宏舟,庄煌煌.准东煤与福建无烟煤燃烧特性的对比实验研究[J].热科学与技术,2015,14(3):184-188.
[10]景雪晖,陶玉洁,李涛,等.不同采矿深度准东煤物化特性和燃烧性能研究[J].能源工程,2014.1:70-74.
[11]郭朝令,徐建国.煤粉气流着火热的计算[J].河南教育学院学报:自然科学版,1999(2):35-36.
[12]丁立新.电厂锅炉原理[M].北京:中国电力出版社,2006:93-101.