氧量对天然焦蒸汽气化特性的影响研究  

Study of the Influence of the Oxygen Quantity on Natural Coke Steam Gasification Characteristics

作　　者：向文国[1] 赵长遂[1] 庞克亮 

机构地区：[1]东南大学能源与环境学院,江苏南京210096 [2]国家电站燃烧工程技术研究中心,辽宁沈阳110034

出　　处：《热能动力工程》2010年第1期97-101,共5页Journal of Engineering for Thermal Energy and Power

基　　金：国家自然科学基金资助项目(90410009;50776018);国家重点基础研究973基金资助项目(2007CB210101)

摘　　要：在小型流化床(50mm、高1600mm)实验装置上对沛城煤矿天然焦-蒸汽气化反应进行实验研究,考察蒸汽中掺入氧气,共同作为气化介质对气化反应产气量、碳转化率、煤气热值和煤气组分等因素的影响,同时与ASPENPLUS软件对其气化过程的模拟结果进行了对比。实验中,天然焦试样量0.2kg/h,蒸汽量1.05kg/h,气化温度900℃,实验结果表明:气化介质中氧量明显影响天然焦蒸汽气化特性。随着氧含量的增加,初始阶段(0～0.2L/min)煤气产量提高了1.76倍,碳转化率提高了1.94倍,两者均显著增加;随着氧量的进一步增加(0.2～1.0L/min),其增加幅度趋缓,产气量增加1.16倍,碳转化率增加1.34倍。煤气中有效气体(H2+CO+CH4)的体积分数和煤气热值均持续减少,有效气体份额从76.9%下降到54.3%,煤气热值从9.01MJ/m3减少到6.34MJ/m3,而CO2体积分数增加明显,从23.1%增加到37.3%。Aspen模拟结果与实验结果基本一致,具有实际指导意义。On a small-sized fluidized bed (diameter 50 mm and height 1 600 mm) test rig,an experimental study has been performed of Peicheng-originated natural coke-steam gasification reaction. The influence of the gasification medium steam,when mixed with oxygen,on the gas production capacity,carbon conversion rate,coal gas heating value and gas constituents etc. was investigated and compared with the simulation results of the gasification process obtained by using software ASPEN PLUS. During the test,the amount of natural coke sample has reached 0.2 kg/h,the steam flow rate was 1.05 kg/h and the gasification temperature was 900 ℃. The test results show that the oxygen content in the gasification medium influences evidently the natural coke steam gasification characteristics. With an increase of the oxygen content (0~0.2 L/min) in the initial stage,the coal gas production capacity will increaase by 1.76 times,and the carbon conversion rate,by 1.94 times,both of which rise remarkably. With a further increase of the oxygen content (0.2~1 L/min),the growth margin will gradually decrease,the gas production capacity,increase by 1.16 times and the carbon conversion rate will rise by 1.34 times. The volumetric fraction of effective gases (H2+CO+CH4) in the coal gas and its heating value will continue to go down. The effective gas proportion will descend from 76.9% to 54.3 % and the heating value of the coal gas,decrease from 9.01 MJ/m3 to 6.34 MJ/m3,but the volumetric fraction of CO2 will increase obviously,from 23.1 % to 37.3 %. The simulation results obtained by using software ASPEN basically correspond with the test ones. Therefore,the foregoing can offer guidance for practical engineering applications.

关 键 词：天然焦 流化床 模拟 蒸汽气化 氧量 

分 类 号：TQ533[化学工程—煤化学工程]