催化剂添加方式及微波干燥对煤催化气化的影响

煤催化气化过程中催化剂的添加方法主要有机械混合和浸渍法混合。以CaO为催化剂,利用自建固定床实验台研究了不同添加方法在不同的恒温条件下对煤气化转化率的影响。实验结果表明:机械混合添加CaO几乎没有催化作用,而浸渍法添加CaO催化活性高,不仅初始反应速率大,且在恒温700℃和800℃工况下气化反应110 min后煤焦转化率分别高出原煤直接气化30%和25%左右。另外,本实验尝试将微波干燥应用在煤催化气化过程中来改进常规浸渍法,经验证:与鼓风干燥箱干燥相比,气化反应110min后在恒温800℃工况下煤焦转化率基本接近一致,在低温700℃和高温850℃时转化率略微高1%～2%左右。

Effects of catalytic gasification of coal on different adding methods of catalyst and the microwave drying

Mechanical mixing and immersion method are two main adding methods of catalyst in catalytic gasification of coal.Taking CaO as the catalyst,effects of different adding methods on gasification of coal was investigated in different temperatures by a fixed-bed reactor.Experimental results show that mechanical mixing does not improve the gasification conversion rate.However,immersion method has a greater initial reaction rate and when gasification reaction proceeds to 110min the gasification conversion rate is about 30%~25% higher than direct gasification of coal at 700℃and 800℃.Moreover,microwave drying was applied in catalytic gasification of coal to improve the conventional immersion method.Experimental results show that in 110min the gasification conversion rate with microwave drying is close to the rate with the blowing drying oven at 800℃and is about 1% to 2% higher than by oven drying at 700℃and 850℃.