Processes for gasification of a carbonaceous feedstock
    7.
    发明授权
    Processes for gasification of a carbonaceous feedstock 有权
    碳质原料气化方法

    公开(公告)号:US08202913B2

    公开(公告)日:2012-06-19

    申请号:US12604695

    申请日:2009-10-23

    IPC分类号: C07C27/00 C10L3/00

    摘要: The present invention relates to processes and continuous processes for preparing gaseous products, and in particular, methane via the catalytic gasification of carbonaceous feedstocks in the presence of steam. In one aspect of the invention, the processes comprise at least partially combusting a first carbonaceous feedstock with an oxygen-rich gas stream, a recycle steam stream, and an aqueous make-up stream in an oxygen-blown gasifier, under suitable temperature and pressure, to generate a first gas stream comprising hydrogen, carbon monoxide and superheated steam; and reacting a second carbonaceous feedstock and the first gas stream in a catalytic gasifier in the presence of a gasification catalyst under suitable temperature and pressure to form a second gas stream comprising a plurality of gaseous products comprising methane, carbon dioxide, hydrogen, carbon monoxide and hydrogen sulfide. The processes can comprise using at least one catalytic methanator to convert carbon monoxide and hydrogen in the gaseous products to methane and in certain embodiments do not recycle carbon monoxide or hydrogen to the gasifier. Heat energy recovered from the catalytic gasification can be used to generate the recycle steam stream.

    摘要翻译: 本发明涉及用于在蒸汽存在下通过碳质原料的催化气化来制备气态产物,特别是甲烷的方法和连续方法。 在本发明的一个方面,该方法包括在合适的温度和压力下,在吹氧气化器中至少部分地燃烧第一含碳原料与富氧气流,再循环蒸汽流和含水补充料流 以产生包含氢气,一氧化碳和过热蒸汽的第一气流; 以及在气化催化剂存在下,在合适的温度和压力下使催化气化器中的第二碳质原料与第一气流反应,形成第二气流,其包含多个包含甲烷,二氧化碳,氢气,一氧化碳和 硫化氢。 该方法可以包括使用至少一种催化甲烷化器将气态产物中的一氧化碳和氢气转化成甲烷,并且在某些实施方案中不将一氧化碳或氢气循环到气化器。 从催化气化回收的热能可用于产生再循环蒸汽流。