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2. 发明公开

EP0259927A1 Process to produce a high methane content gas mixture from coal 失效
标题翻译：韦尔法罕zur Herstellung eines METHreichen气体aus Kohle。
公开(公告)号：EP0259927A1
公开(公告)日：1988-03-16
申请号：EP87201683.7
申请日：1987-09-07
申请人： ENIRICERCHE S.p.A. , SNAM S.p.A.
发明人： Bruno, Giacomo , Carvani, Luigi , Passoni, Giovanni
IPC分类号： C07C1/00
CPC分类号： C10J3/02 , C07C1/00 , C07C9/04 , C10J2300/0903 , C10J2300/093 , C10J2300/0956 , C10J2300/0959 , C10J2300/0973 , C10J2300/0983 , C10J2300/0986 , C10J2300/1678 , C10J2300/1807 , C10L3/08 , C10L5/04 , C10L9/10
摘要： A process is disclosed, to produce a high methane content gas mixture from coal, comprising the following steps:

a) coal grinding to a granulometry not larger than 5 mm, preferably not larger than 2 mm;
b) addition of one or more alkali and/or alkali-earth compounds to the ground coal, wherein the alkali or alkali-earth ions are in an amount comprised within the range of from 4 to 20% by weight relatively to dry, ash-free coal, and possible subsequent drying of the additive-containing coal;
c) possible pelletizing of the additive-containing coal, so to obtain tablets whose maximum dimension is comprised within the range of from 3 mm to 5 cm, preferably of from 3 mm to 2 cm;
d) gasification of the additive-containing coal and methanation of the produced gas, in one single step with a fixed bed of countercurrently descending coal with steam, and in the presence of an amount of air not larger than 35% by weight, relatively to the ash-free dry coal and/or of an amount of essentially pure oxygen amount comprised within the range of from 1 to 25% by weight relatively to the ash-free dry coal, by operating under a pressure higher than 25 abs.atm and at a temperature comprised within the range of from 400 to 850°C, preferably of from 450 to 750°C;
e) removal from the gas produced in the (d) step of unreacted steam, and of the condensible compounds formed;
f) removal of the acidic gases from the high methane content gas mixture obtained.
摘要翻译：公开了一种从煤产生高甲烷含量气体混合物的方法，包括以下步骤：a）将煤粉磨成不大于5mm，优选不大于2mm的粒度; b）向研磨的煤中加入一种或多种碱金属和/或碱土金属化合物，其中所述碱金属或碱土金属离子的含量相对于干的灰分为4-20％煤炭，可能随后干燥含添加剂的煤; c）可能的含有添加剂的煤的造粒，以获得最大尺寸在3mm至5cm，优选3mm至2cm范围内的片剂; d）含有添加剂的煤的气化和产生的气体的甲烷化，在一个单一步骤中，具有用蒸汽逆流下降的煤的固定床，并且在不大于35重量％的空气的量的存在下，相对于无灰干煤和/或基本上纯的氧量的量相对于无灰的干煤在1至25重量％的范围内，通过在高于25atm的压力下操作，以及在400-850℃，优选450-750℃的温度范围内; e）从未反应蒸汽的（d）步骤产生的气体和形成的可冷凝化合物中除去; f）从获得的高甲烷含量气体混合物中除去酸性气体。一个

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