关键词: 煤种, 天然气, 共气化, 合成气

Abstract: Coal and natural gas co-gasifying process is a new technology to produce synthesis gas based on natural gas steam reforming and coal gasification. A moving bed was used as the reactor in hot simulation experiments. With anthracite, lean and fat coals and coke as the raw materials, the effect of different coal types on the temperature in the flame zone was studied. The effect of coal type on the ingredients of synthesis gas, the methane and steam conversions was investigated in the experiments. With the coals as the raw materials, the results showed that the temperature in the flame zone and the content of active compounds (H2+CO) were higher than those of coke. In addition, the H2/CO ratio of synthesis gas was close to the value calculated by thermodynamic equilibrium. For the crude synthesis gas produced in this work, the content of active compounds is not less than 92%, the rudimental methane less than 2%, and the H2/CO ratio in the range of 1~2. The steam conversion rate is more than 75%, and the methane conversion rate over 90%. The higher ash content of coal is advantageous to the coal and natural gas co-gasifying process. The experimental results have proved that the coal and natural gas co-gasifying process is a new technology to produce synthesis gas suitable to the resource characteristics in China.

Key words: coal type, natural gas, co-gasifying, synthesis gas