造纸黑液对苇秆水热碳化的影响

Effects of papermaking black liquor on hydrothermal carbonization of reed stalk

以芦苇秆为物料并对比纯水环境,考察了造纸黑液和芦苇秆质量比(液固比)对生物质水热碳化过程的影响。结果表明,随着液固比增加,水热焦产率从42.20%下降至31.87%,均低于纯水中相应水热焦产率;碳质量分数为67.01%~69.04%,稍高于纯水环境中对应参数。两种环境下,水热焦H/C和O/C原子质量比均进入褐煤区域。造纸黑液促进了芦苇秆中有机物的溶解,液固比增加至10以后,水热焦高位热值最高为28.06 MJ/kg,能量密度约为1.7,燃料比大于1,液体产物pH约为4。

The effect of the mass ratio(liquid-solid ratio)of papermaking black liquor to reed stalk on the hydrothermal carbonization of reed stalk is investigated with pure water as a comparison condition.It is shown from the results that with the increase of liquid-solid ratio,the yield of hydrochar decreases from 42.2%to 31.9%under black liquor condition,which is lower than that under pure water condition.The contents of carbon in hydrochar are in the range of 67%-69.04%,slightly higher than those under pure water condition.Under both conditions,the H/C and O/C atomic ratios of hydrochar enter the range of lignite.Black liquor promotes the dissolution of organic matter in reed stalk.The highest calorific value of hydrochar is 28 MJ·kg-1,the energy density is about 1.7,the fuel ratio is greater than 1,and the pH value of liquid product is about 4 when the liquid-solid ratio increases to 10.