| 摘要 |
In a process for producing a fuel gas from a solid fuel by a gasification of solid fuel under a pressure of about 15-100 bars by a treatment with steam and a gas which contains free oxygen, cooling the raw gas to a temperature of about 150 DEG -200 DEG C. and saturating it with water vapor, removing condensate which has formed so that the raw gas contains hydrocarbons having a boiling range from about 20 DEG to 400 DEG C. in an amount of about 10-100 g per standard m3 of dry gas and has a CO:H2O volume ratio of about 0.8-2, and subjecting the raw gas to a shift conversion, the improvement which comprises dividing the raw gas into first and second partial streams in a ratio of about 1:10 to 1:1, feeding the first partial stream with a surplus of water vapor to a first shift conversion stage at an inlet temperature of about 280 DEG -450 DEG C., and passing through a second shift conversion stage a mixture of effluent gas from the first shift conversion stage and at least part of the second partial stream of raw gas at a temperature of about 300 DEG -500 DEG C., while maintaining a pressure of about 15-100 bars in the shift conversion stages. Advantageously water vapor is added to the raw gas entering the first shift conversion stage in at least about 70% of the stoichiometric amount required for shift conversion of all the carbon monoxide contained in the entire raw gas.
|
