天然气催化部分氧化制合成气工艺模拟及中试放大

利用Aspen plus软件,对天然气催化部分氧化制合成气的中试工程问题进行了研究,通过模拟计算及中试试验,考察了原料气的进料方式、预热温度以及放热氧化反应与吸热重整反应的能量耦合等对反应过程的影响.热力学计算结果表明,在2 MPa的压力下,反应温度需高于1273 K,合成气收率才能大于80％,而在近似绝热的反应条件下原料气预热温度则需控制在773 ～ 923 K.开发出适于天然气催化部分氧化制合成气的热量耦合型固定床反应装置,进料方式采用双流道外混合型喷嘴,模拟计算及中试试验表明该技术方案可行.

Process simulation and pilot-plant study on catalytic partial oxidation of natural gas to syngas

Engineering issues for catalytic partial oxidation of natural gas to syngas were studied in a pilot plant using Aspen plus software.The effects of introduction method of feed gases,preheating temperature of feeds and coupling of exothermic oxidation reactions with endothermic reforming reactions on the reaction process were investigated through simulation and experiment.The thermodynamic calculation results showed that at a pressure of 2.0 MPa,the reaction temperature should reach at least 1273 K in order to obtain a yield of CO higher than 80％.To reach such a high reaction temperature under adiabatic conditions,the feed gases needed to be preheated to a temperature within the range of 773-923 K.A thermally coupled fixed-bed reactor suitable for natural gas catalytic partial oxidation process was developed,an external mixing nozzle with double channel was adopted in the pilot unit,and this consideration was proved to be feasible based on thermodynamic calculation and experimental validations.