湿牛粪催化热解制取富氢气体

HYDROGEN-RICH GAS PRODUCTION FROM WET CATTLE MANURE BY CATALYTIC PYROLYSIS

以SiO_2、CaO、牛粪灰以及K_2CO_3为催化剂,对湿牛粪进行热解气化制富氢气体的试验研究。结果表明,各催化剂对牛粪热裂解反应催化作用的强弱顺序依次为K_2CO_3>牛粪灰>CaO>SiO_2。在催化反应过程中,SiO_2的催化方向是牛粪热解液化产焦油方向而非热解气化产热解气方向,CaO对牛粪热解产焦油和产热解气均具有较好的催化作用,牛粪灰的催化作用主要表现在焦炭与水蒸气的蒸汽重整反应上,而K_2CO_3主要表现在焦油的二次裂解与蒸汽重整反应上。从经济成本与催化效果角度综合考量,牛粪灰催化湿牛粪热解制取富氢气体具有良好的实际应用价值。

Experiments were conducted to produce hydrogen-rich gas by using directly wet cattle manure as raw materials by catalytic pyrolysis in this research. The used catalytic consisted of silica （SiO2）, calcium oxide （CaO） , cattle manure ash, and potassium carbonate （K2CO3）. Experimental results indicated that the order of catalytic effect for each catalytic is K2CO3〉cattle manure ash〉CaO〉SiO2. During the pyrolysis process of cattle manures, the positive effect of SiO2 is to produce more tar, not gas products. It is different that CaO has positive effect for the produce of both tar and gas. Comparing with SiO2 and CaO, cattle manure ash has a stronger promotion for the pyrolysis process of cattle manures. The effect is to accelerate the steam reform reaction between char and steam. Moreover, comparing with cattle manure ash, the catalytic effect of K2CO3 is to promote the second pyrolysis of tar as well as the steam reform reaction between tar and steam. Considering both economic cost and catalytic efficiency, cattle manure ash is an attractive alternative for the catalytic pyrolysis of wet cattle manures to produce hydrogen-rich gas in real applications.