酸预处理对生物质热裂解规律影响的实验研究

在自制的热裂解机理实验台上进行了不同酸处理对稻壳以及白松的热裂解影响实验研究。经过盐酸浸泡后，稻壳中的金属离子含量明显降低；经盐酸洗涤后的稻壳热裂解焦油产量升高，由原始物料时的41.74%增加到7%盐酸洗涤后的52.88%，而气体和焦炭产量相应降低，并且随着盐酸浓度的增加，对应的趋势更加明显。酸洗涤后稻壳热裂解气体产物主要由CO和CO₂组成，其产量相比原样都有所降低；不同种类的酸对生物质热裂解规律的影响存在差异，盐酸因其去离子效果最好而对生物质热裂解产物分布影响最强；对白松原样以及酸洗后白松的微观结构进行了电镜分析，结果发现，硫酸对白松的微观结构产生了明显的影响。

Experimental study of the effect of acid-wash pretreatment on biomass pyrolysis

The influence of acid-washing pretreatment on biomass pyrolysis was experimentally studied in a radiation reactor. The results show that the metal ions content of rice husk treated by acids is reduced markedly. The yield of tar from pyrolysis of rice husk treated by 7% HCl increased from 41.74% to 52.88%, and the yields of gas and char decrease. The influence will be more remarkable with the increase of acid concentration. The gaseous products of pyrolysis of HCl-treated rice husk mainly consist of CO and CO_2 which yields decreased metal ions content when compared with those of the raw sample. The effects of H_2SO_4, HCl, and H_3PO_4 on biomass pyrolysis are different. HCl has the strongest effect on the pyrolysis products distribution because of the least amounts of K~+ remained after HCl treatment. The microstructures of biomass are damaged seriously by H_2SO_4 treatment.