摘要
用直径200mm的外热式固定床反应器,以城市生活污泥为试验物料,在250-700℃之间对其进行了中低温热解的试验研究,得到气、液、固3种热解产物的产率随热解温度的变化规律。结果表明,固体产物的产率随热解终温的升高而下降,在250-450℃范围内减少较快,在450-700℃范围内减少非常缓慢;而热解液产率在450℃以下呈上升趋势,450-550℃热解液产率较高,550℃达最高值43%,550℃以上呈下降趋势;液态产物中有明显的分层现象,最下层为热解产生的水分及水溶性有机物,中间层为脂肪酸类及硫醇类物质,最上层为脂肪族、烯族碳氢类物质;热解气产率在整个试验温度范围内均呈增加趋势,450℃后气体产生速率明显增加。450℃左右,有机物发生二次裂解反应。这些规律为城市生活污泥热解技术的实际工业应用提供了可靠的基础性资料。
The pyrolysis experiments of sewage sludge at low and middle temperature range from 250℃ to 700℃ were carried out in a Ф200mm external-heat fixed bed reactor. The influence of final pyrogenation temperature on product yield of gases, liquids and solid residues was studied. It was found that the fraction of solid yield decreased during increasing the final pyrolysis temperature, the decrease was sharp at 250 - 450℃, but the decrease became slowness at 450 - 700℃. And the liquid yield increased gradually during the increasing of final pyrogenation temperature below 450℃. The liquids yield was higher at 450 - 550℃, and the highest yield rate was 43% （550℃）. When the final pyrogenation temperature exceeded 550℃, the liquids yield would decrease. In addition the liquids delamination appeared. Water and certain hydrosoluble organic compounds were at the bottom. Fatty acids and thioalcohol types were in the middle. Olefinic, aliphatic hydrocarbons were on the top. The gas yield rate increased at whole experiment temperature and increased evidently above 450℃ .There was secondary pyrogenation for organic compound about 450℃ .All the results can offer reliable base data for the application of pyrogenation technique of sewage sludge.
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2006年第8期835-840,共6页
Acta Energiae Solaris Sinica
基金
国家自然科学基金项目(50378062)
天津大学211工程建设项目
关键词
污水污泥
热解
产物分布
固定床
终温
sewage sludge
pyrogenation
product distribution
fixed bed
final temperature of pyrogenation
