An integrated fluidized bed (IFB) reactor with a two-stage configuration has been developed to process small-size coal particles for the simultaneous production of CH₄-rich syngas and high-quality tar, in which coal pyrolysis occurred in an upper transport bed (TB) within an atmosphere mixing steam and syngas generated by steam-oxygen gasification of coal or char in a lower fluidized bed (FB). The coupling effect was investigated by combining non-catalytic/catalytic pyrolysis and gasification in a pressurized IFB. Having TB pyrolysis obviously raised CH₄ yield (also its content in producer gas) and tar yield. The respective contributions to CH₄ formation from the TB pyrolysis and FB gasification were mainly relevant to operating pressure and Ca(OH)₂ catalyst. Raising pressure facilitated CH₄ formation. When lignite was treated without catalyst, the contribution from TB pyrolysis was greater than that from FB gasification as hydropyrolysis was intensified by pressure in H₂-rich gas atmosphere from the FB gasifier. Adding catalyst into lignite reversed their contributions. The FB catalytic gasification formed more CH₄ because Ca(OH)₂ functioned well as a catalyst for CH₄ formation in pressurized gasification. With elevated pressure or/and the addition of Ca(OH)₂, pyrolysis tar yield decreased in different degrees but its quality was improved. With the combination effect of pressure and Ca(OH)₂, producer gas from the tested IFB reactor was highly rich in CH₄ to reach 10.8 vol%, with as well a high H₂/CO ratio of 2.3 that is suitable for making SNG. The obtained tar had its light tar content as high as 95 wt%.

已开发出具有两阶段配置的集成流化床（IFB）反应器，可处理小尺寸的煤颗粒，以同时生产富含CH _4的合成气和高质量的焦油，其中煤的热解发生在上部运输床中（TB）在大气中混合蒸汽和合成气，这些蒸汽和合成气是通过下部流化床（FB）中的煤或炭的蒸汽-氧气气化而产生的。通过在加压IFB中结合非催化/催化热解和气化研究耦合效应。进行TB热解明显提高了CH _4的收率（也包括其在生产气中的含量）和焦油的收率。TB热解和FB气化对CH ₄形成的贡献主要与工作压力和Ca（OH）有关₂催化剂。升高压力促进了CH _4的形成。当褐煤在没有催化剂的情况下处理时，TB热解的贡献大于FB气化的贡献，因为通过FB气化器在富含H _2的气体气氛中加氢热解。在褐煤中添加催化剂可逆转其贡献。FB催化气化可形成更多的CH _4，因为Ca（OH）₂在加压气化中可作为CH ₄形成催化剂。随着压力的升高和/或Ca（OH）_2的添加，热解焦油收率有不同程度的下降，但其质量有所提高。结合压力和Ca（OH）_2的作用，来自经过测试的IFB反应器的生产气富含CH ₄达到10.8 vol％，并且H ₂ / CO比率高达2.3，适合于生产SNG。所得焦油的轻焦油含量高达95重量％。