洁净煤技术

2020, v.26;No.128(04) 140-146

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煤粉流态化预热气态组分CO/CO_2生成转化特性研究
Study on the formation and conversion characteristics of gaseous component CO/CO_2 with fluidized preheating pulverized coal

刘玉华;刘敬樟;吕清刚;朱建国;朱书骏;
LIU Yuhua;LIU Jingzhang;LYU Qinggang;ZHU Jianguo;ZHU Shujun;Institute of Engineering Thermophysics,Chinese Academy of Sciences;University of Chinese Academy of Sciences;Institute of Mechanics,Chinese Academy of Sciences;

摘要(Abstract):

基于循环流化床预热的燃烧系统是一种新型的清洁燃烧技术,其流态化预热后煤气中CO/CO_2比值对后续燃烧和排放影响较大,研究正确反映CO/CO_2比值的焦炭燃烧模型有助于进一步了解该流态化预热过程。笔者基于燃料流态化预热转化过程,研究典型的预热空气富氧气氛(O_2/N2)、富氧气氛(O_2/CO_2)以及燃料种类变化对预热后气态组分中CO/CO_2生成转化特性的影响,分析现有焦炭燃烧模型与流态化预热过程的匹配程度。试验数据和模型预测对比分析表明,空气富氧气氛下,氧气浓度从21%增至28.2%的过程中,神木半焦流态化预热过程产生的预热气体中CO_2占比减少,CO占比增多,CO/CO_2比值从0.81增至1.45;神木烟煤在该气氛预热时,各参数与神木半焦呈现同样的变化趋势,且随氧气浓度从21.0%增至24.4%,CO/CO_2比值从0.51增至0.76。富氧气氛时神木半焦预热产生的CO与神木烟煤相比产量更高,CO/CO_2比值随氧气浓度增大而增大,但与空气富氧气氛下相比递增幅度较小。神木烟煤预热气体组分CO/CO_2的试验数据与Tognotti提出的焦炭燃烧模型预测值吻合度最高,富氧气氛下试验与预测结果误差在9%以内。
The preheating combustion technology based on circulating fluidized bed proposed is one of the new clean coal combustion technologies.The O_2/CO_2 ratio in the gas after fluidized preheating process has a great influence on the subsequent combustion and emissions.Exploring the coke combustion model that can correctly reflect the O_2/CO_2 ratio will help to further understand the fluidized preheating process.Based on the pulverized coal fluidized preheating conversion process,the typical preheated air-rich atmosphere( O_2/N2),oxygenrich atmosphere( O_2/CO_2),and fuel type change were used to study the conversion characteristics of the gaseous component CO/CO_2 after preheating.Moreover,the degree of matching between the existing coke combustion model and the fluidized preheating process was analyzed.The experimental data and model predictions show that in the air-rich oxygen atmosphere,as the oxygen concentration increases from 21% to 28.2%,the proportion of CO_2 in the preheated gas produced by Shenmu semi-coke fluidized preheating process decreases,the proportion of CO increases,and the CO/CO_2 ratio increases from 0.81 to 1.45.When Shenmu bituminous coal is preheated in the same atmosphere,the above-mentioned parameters show the same tendency as Shenmu semi-coke,and the CO/CO_2 ratio increases from 0.51 to0.76 as the oxygen concentration increases from 21.0% to 24.4%.In the oxygen-rich atmosphere,the CO produced by Shenmu semi-coke preheating is higher than that of Shenmu bituminous coal. The CO/CO_2 ratio also increases with the increase of oxygen concentration,but compared with the air-enriched atmosphere,the increasing degree is smaller. The experimental data of the preheated gas component CO/CO_2 of Shenmu bituminous coal is the most consistent with the prediction of the coke combustion model proposed by Tognotti,and the error of experiment and prediction results is within 9% under oxygen-rich atmosphere

关键词(KeyWords): 预热燃烧;空气富氧;富氧气氛;CO/CO_2
preheating combustion;air-rich oxygen;oxygen-rich atmosphere;CO/CO_2

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划资助项目(2017YFB0602001);; 国家自然科学基金资助项目(51876204)

作者(Author): 刘玉华;刘敬樟;吕清刚;朱建国;朱书骏;
LIU Yuhua;LIU Jingzhang;LYU Qinggang;ZHU Jianguo;ZHU Shujun;Institute of Engineering Thermophysics,Chinese Academy of Sciences;University of Chinese Academy of Sciences;Institute of Mechanics,Chinese Academy of Sciences;

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DOI: 10.13226/j.issn.1006-6772.19110602

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