论文部分内容阅读
主要研究碱金属盐对生物质催化气化制氢的影响。以K_2CO_3为催化剂研究气化温度和水蒸气生物质比对麦秆水蒸气气化影响时发现在低温、低水蒸气量条件下,K_2CO_3对麦秆热解的催化作用占主导地位;随气化温度和S/B的增加,K_2CO_3对麦秆焦的水蒸气气化催化作用逐渐增强,在700℃、S/B为4时达到最大,得到最大H_2浓度和产量;随气化温度继续增加,K_2CO_3和SiO_2反应生成没有催化作用的、低熔点的钾盐,导致K_2CO_3逐渐失活,在800℃时由于灰的熔融甚至抑制麦秆的水蒸气气化制氢。不同赋存形式的钾盐对麦秆的水蒸气气化有不同的催化效果,K_2SO_4和KCl都会抑制氢气生成而促进焦炭产生;与此相反,K_2CO_3和CH_3COOK都会显著促进麦秆的水蒸气气化制取氢气,并且K_2CO_3的催化效果要优于CH_3COOK。
The main study of alkali metal salts on biomass catalytic gasification of hydrogen production. K_2CO_3 as a catalyst to study the effect of gasification temperature and water vapor ratio on steam gasification of wheat straw showed that under the condition of low temperature and low water vapor, the catalytic effect of K_2CO_3 on the pyrolysis of wheat straw dominates. With the gasification Temperature and S / B increase, K_2CO_3 gradually enhances the catalytic effect of K_2CO_3 on the steam gasification of corn coke, reaches the maximum at 700 ℃ and S / B of 4, and the maximum H_2 concentration and yield are obtained. With the increase of gasification temperature, K 2 CO 3 reacts with SiO 2 to form a low melting point potassium salt without catalysis, which leads to the gradual deactivation of K 2 CO 3. At 800 ℃, hydrogen production is even inhibited by the steam melting of straw due to the melting of the ash. K 2 SO 4 and KCl both inhibited the formation of hydrogen and promoted the coke production. On the contrary, both K 2 CO 3 and CH 3 COOK promoted the steam gasification of wheat straw Preparation of hydrogen, and K_2CO_3 catalytic effect is better than CH_3COOK.