福建无烟粉煤流化床混合气催化气化表观动力学的研究

APPARENT KINETICS OF CATALYTIC GASIFICATION ON PULVERIZED FUJIAN ANTHRACITE WITH MIXING GAS IN FLUIDIZED BEDS

在一模试流化床中 ,首次报道了福建劣质无烟粉煤 (挥发分 <5 % )采用工业副产碱盐为主制备的复合催化剂进行混合气催化气化的结果。指出这一复合催化剂适宜的添加饱和度为 10 % ;表观动力学实验表明在该添加饱和度下 ,使反应表观活化能由无催化剂时的Ea=76 0 3kJ mol降为Ea=45 83kJ mol(几乎降低了 40 % ) ,并且在气化温度 85 0℃条件下 ,其表观反应速率常数比无催化剂时提高 2 7倍 ;在气化温度 85 0～ 90 0℃ ,催化剂浓度 10 %的适宜操作范围 ,可获得产气率V =3 77～ 3 5 8m3 kg(1kg煤 ) ,煤气热值QLHV =5 31～ 6 0 3MJ m3 与冷煤气效率 η =79 72～ 85 73%的良好结果。这对劣质无烟粉煤催化气化生产燃料气与化工副产碱盐制取廉价催化剂的工业化实践具有重要的应用价值与可操作的现实意义。

The catalytic gasification of a low-quality pulverized Fujian anthracite with volatile matter less than 5%, using an alkali-salt by-product from chemical plants as dominant component of the mixed catalyst (MC) and steam/air as gasification agent was investigated in a small-scale fluidized bed It indicated that the suitable concentration of MC is about 10% The apparent activation energy (E a) can be reduced from 76 03 kJ/mol in non-catalyst case to 45 83 kJ/mol in catalytic gasification being 60% of the former At temperature of 850℃, the apparent reaction-rate constant (k) in catalytic gasification can be increased to 2 7 times as compared to non-catalyst one Under the gasification temperature of 850～900℃ and the MC concentration of 10% conditions, the optimum results, i e the higher gas yield (V=3 77～3 57m 3/kg·coal), and low-heating value (Q LHV =5 31～6 03 MJ/m 3) and better cold coal gas efficiency (η-79 72～85 93%), can be obtained