摘要
基于吉布斯自由能最小化原理,在Aspen Plus软件上建立了Ni O-CH4化学链燃烧模型。通过计算反应器内的化学平衡,分析了反应物摩尔比、反应温度、反应压力和气体流量等对反应器出口气相产物组成的影响,明确了Ni O-CH4化学链燃烧的反应机理,进而对Ni O-CH4化学链燃烧的反应条件进行了优化。实验结果表明,当n（Ni O）∶n（CH4）≤1时,燃料的燃烧以甲烷重整反应为主;当14时,全部发生还原反应,生成CO2和H2O。当n（Ni O）∶n（CH4）=4、反应温度为1 000~1 100 K时,Ni O-CH4化学链燃烧效率的效率最高;适当提高反应压力有助于提高CH4化学链燃烧效率,抑制其他反应的发生,但反应压力不宜大于8 MPa;在满足燃烧器功率的要求下,应尽量降低气体流量。
Based on the Gibbs free energy minimization principle,a Ni O-CH4 chemical looping combustion model was established by means of the Aspen Plus software. By calculating the chemical equilibrium in the reactor,the influences of molar ratio of reactants,reactor temperature and operation pressure on the composition of the gas products at the reactor outlet were investigated,and then the reaction conditions of the Ni O-CH4 chemical looping combustion were optimized. It was showed that,when the molar ratio of the reactants was n（Ni O）∶n（CH4）≤1,methane reforming was the main reaction. When 1n（Ni O）∶n（CH4）≤4,reduction reaction gradually increased and the reforming reaction gradually decreased. When n（Ni O）∶n（CH4）4,only the reduction reaction occurred to generate CO2 and H2 O. When the mole ratio of Ni O-CH4 was kept at 4 and the reactor temperature was between 1 000-1 100 K,the maximum efficiency of the CH4 chemical looping combustion could be obtained. Increasing operating pressure could improve the effi ciency of the CH4 chemical looping combustion and inhibit side-reactions,but the pressure should not be higher than 8 MPa.
出处
《石油化工》
CAS
CSCD
北大核心
2016年第3期280-284,共5页
Petrochemical Technology
基金
动力工程多相流国家重点实验室开放课题:陕西省自然科学基础研究计划项目(2015JM5229)
关键词
化学链燃烧
镍基载氧剂
甲烷
chemical-looping combustion
Ni-based oxygen carrier
methane
