关键词: 褐煤气化, 孔隙, 比表面积, 气流床反应器

Abstract: Shengli brown coal was gasified by using a laboratory entrained flow reactor at 900℃ under the atmospheres of H₂O, O₂ and their mixture, and pore structure features were investigated. The shapes of adsorption isothermal curves obtained from the chars under various atmospheres were Type II and the shapes of the adsorption loop curves were Type H3. There was a relatively continuous and integral pore system of chars with similar pore structures. Pore diameter distribution was influenced by reaction atmosphere. The quantity of macropores of char was less under all three atmospheres;the order of mesoporesfrom more to less was H₂O > O₂> H₂O+1%O₂, and the order of micropores was the reverse. The specific surface area of char presented the trend of increasing at first, then maintaining steady with the increase of H₂O. The specific surface area of char during gasification under H₂O+1%O₂ mixture atmosphere increased by more than 30 times. It increased linearly with the increase of O₂ at low concentration of oxygen. The relational expression for conversion versus ratio of micropore volume and total pore volume, and conversion versus specific surface area was X=0.196(V_m/V)+45.651, X=0.037S+48.066.

Key words: brown coal gasification, porosity, special surface area, entrained-flow reactor