摘要
煤制替代天然气(SNG)的核心技术是甲烷合成工艺。通过深入研究甲烷合成反应的影响因素,分析甲烷合成特点及反应平衡曲线发现:多段反应可以解决甲烷合成的强放热问题;选择高CH^4含量的气化技术对于降低装置规模具有重大影响;氢碳比模数保持在2.9~3.05(左半区)可以使SNG产品质量更加稳定;分水设施能提高产品气中的CH^4含量。基于以上研究,提出2种新的甲烷合成工艺:三段串并联工艺降低了循环气量、压缩机功耗及反应器尺寸;一次通过式集成工艺无需循环,增大了原料气的一次通过效率。两种新工艺各有不同的优势。
Methanation is the key process for coal to SNG.This paper analyzes the main influential factors of methanation process,the reaction characteristics and the equilibrium curve.It is found that multistage reactions could resolve the strongly exothermic reaction problem of methanation synthesis,the selection of high CH_4 content gasification technology plays a significant role in reducing the scale of SNG plant,maintaining the H_2 to carbon ratio module between 2.9to 3.05 can make the SNG product quality more stable,and the water separation equipment can enhance the CH_4 content of the product.Based on the researches above,two new methanation processes are proposed.Compared with foreign technologies,three-stage methanation process can reduce the flow rate of recycle gas,the power consumption of compressor and the size of reactor.Once-through integrated process without recycle gas can improve the once-through rate of raw gas.The two processes have different advantages.
出处
《石油化工设计》
CAS
2017年第1期1-4,8,共5页
Petrochemical Design
关键词
替代天然气
甲烷合成
合成天然气
工艺
Substitute natural gas
Methane synthesis
Synthetic natural gas
Process