松木屑催化气化制取富氢燃气

Catalytic gasification of pine sawdust for producing hydrogen-rich gas

以松木屑为生物质原料,水蒸气为气化介质,使用自制镍基复合催化剂Ni-CaO,在固定床气化炉中进行生物质催化气化反应,考察了催化剂用量、气化温度和水蒸气流量对生物质水蒸气气化制氢特性的影响。结果表明,当催化剂与原料质量比由0增加至1.5时,H_2体积分数由45.58%增至60.23%,产氢率由38.80g/kg增至93.75g/kg,当催化剂与原料质量比为2时,两者均有增加,但是变化不明显。温度从700℃增至750℃时,燃气中H_2的体积分数由54.24%增至60.23%,CO_2由21.09%降至13.18%,继续升高温度,H_2的体积分数和燃气热值均逐渐降低,以Ni-CaO为催化剂时750℃是制取富氢燃气的最佳气化温度。当气化温度为750℃,催化剂与原料质量比为1.5,水蒸气通入量为0.34g/(min·g)时,H_2体积分数为60.23%,产氢率为93.75g/kg,燃气热值为12.13MJ/m^3。

Steam catalytic gasification experiments of pine sawdust to produce hydrogen-rich gas were carried out in a high-temperature fixed bed reactor with Ni-CaO as the catalyst. The influence of catalyst dosage, gasification temperature and steam flow rate on hydrogen content were investigated. The results showed that by increasing the catalyst to sawdust ratio from 0 to 1.5 （g/g）, the hydrogen content was increased from 45.58% to 60.23%, and the hydrogen yield was increased from 38.80 g/kg to 93.75g/kg, whereas the hydrogen content and hydrogen yield only showed a modest increase when the ratio was changed into 2. Increasing the gasification temperature from 700℃ to 750℃ significantly increased the hydrogen content from 54.24% to 60.23%, and decreased the carbon dioxide content from 21.09% to 13.18%, but higher temperature gave rise to a decrease in the hydrogen content and the low heating value.When the best gasification temperature was taken as 750℃, and the catalyst to sawdust ratio and the steam flow rate were 1.5（g/g） and 0.34g/（min-g）, the resulting hydrogen content, dry gas yield and low heating value were 60.23%, 93.75g/kg, and 12.13MJ/m^3, respectively.