O_2/CO_2条件下煤泥球团的燃烧特性实验研究
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摘要
在水平管式炉中O2/CO2条件下对山西吕梁烟煤煤泥进行燃烧实验,研究颗粒直径及氧气体积分数对预干燥煤泥球团燃烧特性的影响.采用热电偶测量煤泥球团燃烧过程中内部温度的变化,并通过高清摄像机同步记录预干燥煤泥球团的燃烧过程.在炉温为800℃、氧气体积分数分别为10%、20%、30%、40%以及50%的条件下,对6～12 mm范围内4个不同直径的煤泥球团进行燃烧实验研究.结果表明:不同氧气体积分数下的预干燥煤泥球团呈现出不同的着火方式;煤泥球团内部达到的最高温度随着氧气体积分数的提高而提高,但与煤泥球团直径关系不大;同一粒径下,富氧燃烧条件有助于煤泥的燃尽;煤泥着火延迟时间随氧气体积分数的提高而减少.
To understand combustion characteristics of Lvliang bituminous coal slime from Shanxi Province and to study the effects of changing particle diameter and oxygen volume fraction,O2/CO2 combustion experiments of coal slime pellets were carried out,in which the thermocouple was used to online measure the inner temperature during the combustion process,and simultaneously the whole combustion process was monitored by a high-resolution camera. The results indicate that the dry coal slime pellets show different ignition modes at 800 ℃ under different conditions of 10% ～ 50% O2 concentrations. The maximum inner temperature of the coal slime pellets increases with the increasing of volume fraction,but irrelated with its diameter. The enrichment of oxygen facilitates burnout of the coal slime pellets with same particle sizes. The ignition delay time decreases as the volume fraction increases.
To understand combustion characteristics of Lvliang bituminous coal slime from Shanxi Province and to study the effects of changing particle diameter and oxygen volume fraction,O2/CO2 combustion experiments of coal slime pellets were carried out,in which the thermocouple was used to online measure the inner temperature during the combustion process,and simultaneously the whole combustion process was monitored by a high-resolution camera. The results indicate that the dry coal slime pellets show different ignition modes at 800 ℃ under different conditions of 10% ～ 50% O2 concentrations. The maximum inner temperature of the coal slime pellets increases with the increasing of volume fraction,but irrelated with its diameter. The enrichment of oxygen facilitates burnout of the coal slime pellets with same particle sizes. The ignition delay time decreases as the volume fraction increases.
引文
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[2]MA Xingmin,ZHAO Q Z,GAO S G,et al. Suction characteristics of a thick material pump at high concentrations of coal slime[J]. International Journal of Mining Science and Technology,2008,18(2):210. DOI:10.1016/S1006-1266(08)60044-9
[3]倪明江,罗卫红,黄国权,等.煤水混合物在流化床燃烧过程中的凝聚结团现象[J].浙江大学学报(自然科学版),1986,20(6):43NI Mingjiang,LUO Weihong,HUANG Guoquan,et al. Agglomeration of CWM in fluidized bed combustor[J]. Journal of Zhejiang University,1986,20(6):43
[4]司玉成,杜美利.煤泥利用研究进展[J].广东化工,2017(4):79SI Yucheng,DU Meili. Research progress of slime utilization[J].Guangdong Chemical Industry,2017(4):79
[5]李宁,雷宏彬,田忠文,等.煤泥资源化利用关键技术研究分析[J].煤炭工程,2011,43(12):100LI Ning,LEI Hongbin,TIAN Zhongwen,et al. The research and analysis of key technology of coal slime utilization[J]. Coal Engineering,2011,43(12):100
[6] LIU H B,LIU Z L. Recycling utilization patterns of coal mining waste in China[J]. Resources Conservation&Recycling,2010,54(12):1331. DOI:10.1016/j.resconrec.2010.05.005
[7]MATHEKGA H I,OBOIRIEN B O,NORTH B C. A review of oxyfuel combustion in fluidized bed reactors[J]. International Journal of Energy Research,2016,40(7):878. DOI:10.1002/er.3486
[8]NIU S L,HAN K H,LU C M. Characteristic of coal combustion in oxygen/carbon dioxide atmosphere and nitric oxide release during this process[J]. Energy Conversion&Management,2011,52(1):532. DOI:10.1016/j.enconman.2010.07.028
[9]WANG C,LEI M,LIU H,et al. Combustion characteristics and nitric oxide release of the pulverized coals under oxy-enrich conditions[J]. Industrial&Engineering Chemistry Research,2012,51(44):14355. DOI:10.1021/ie301097c
[10]NIU S,CHEN M,LI Y,et al. Evaluation on the oxy-fuel combustion behavior of dried sewage sludge[J]. Fuel,2016,178:129. DOI:10.1016/j.fuel.2016.03.053
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