大同煤在等离子体热解中生成HCN和NH_3的研究  被引量:6

Formation of HCN and NH_3 during Datong coal pyrolysis in arc plasma jet

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作  者:鲍卫仁[1] 章劲草[1] 申曙光[1] 曹青[1] 吕永康[1] 

机构地区:[1]太原理工大学煤科学与技术教育部和山西省重点实验室,山西太原030024

出  处:《煤炭学报》2006年第2期232-236,共5页Journal of China Coal Society

基  金:国家自然科学基金资助项目(20576086);山西省科技攻关项目(051161)

摘  要:对大同煤中氮在等离子体反应器内的转化进行了研究,考察了输煤速率、输入功率和反应气氛等实验条件对HCN和NH3生成的影响,同时基于G ibbs自由能最小原理,计算了C-H-O-N的热力学平衡组成.实验和计算结果表明:煤中氮在等离子体中主要以HCN形式存在,也有少量氮转化为NH3.随着温度的升高,理论计算得到HCN的产率逐渐增大而NH3的产率逐渐降低,而实验结果却显示HCN和NH3的产率逐渐升高.在纯Ar等离子气氛中随供煤速率的增加,HCN的产率呈先增大后减小的趋势,NH3的变化趋势相反;随反应器输入功率的提高,HCN和NH3的产率逐渐增大.H2的引入有利于HCN和NH3的生成,CO2降低了HCN和NH3的产率,而O2有利于NH3的生成,但也促进了HCN的进一步转化.The formation of HCN and NH3 from coal - N was investigated in a plasma coal pyrolysis reactor. Based on Gibbs free energy minimization principle, Thermodynamic equilibrium fraction of C - H - O - N was calculated. The results from experiments and calculation suggest that HCN is the main product of coal - N at high temperature. Only a little coal -N converted to NH3. As the temperature increases, the yields of HCN and NH3 increases from the experimental results, but the theoretic calculated results show that HCN gradually increases and NH3 decreases. The possible reason is the influence of practical operating condition. The yield of HCN increases firstly and then decreases with increasing coal feeding rate, but NH3 is reverse. Enhancement of input power leas to the increase of HCN and NH3 yields. H2 acting as the reactive atmosphere benefits to the formation of HCN and NH3, and CO2 may reduce the yields of HCN and NH3, 02 enhance the formation of NH3, but promotes the furthermore conversion of HCN.

关 键 词: 等离子体热解 HCN NH3 

分 类 号:TQ530.2[化学工程—煤化学工程]

 

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