城市干污泥热解气化

针对包头市南郊污水处理厂污水污泥，采用先热解后对热解残渣进行气化的方法探讨城市污泥的有效利用方式。污泥热解实验取升温速率（20~60℃·min-1）和终温（400~600℃）作为影响因素，得出各热解产物产率的变化规律。结果表明，污泥热解在终温为600℃时失重率达到57.53%，焦油产率在450℃达到峰值。污泥残渣的气化分别以水蒸气和CO2作为气化剂，探讨了800~1 000℃范围内的气化产品气组分变化规律。以水蒸气为气化剂时，污泥热解残渣的可制备富氢产品气，产品气中H2体积分数随着反应温度的增加而增加，1 000℃时H2含量可达68.83%，H2+CO含量达到81.36%，低位热值为9.18 MJ·Nm-3。以CO2作为气化剂时，产品气中富含CO，温度越高CO含量越高，1 000℃时到达最大值53.84%，产品气低位热值为7.25 MJ·Nm-3。

Pyrolysis and Gasification of Municipal Dry Sludge

The main objective of this study is to discuss the effective utilization of municipal sludge by method of gasification after pyrolysis, the sludge is from Baotou south suburb sewage treatment plant. The variation law of pyrolysis yields were obtained at heating rate from 20 to 60℃·min-1 and final pyrolysis temperatures in the range from 400 to 600℃. The results showed that the weight loss rate was 57.53% at the final temperature of 600℃, and the tar yield reached the maximum value of 26.25% at 450℃. Gasification of sludge pyrolysis residue was carried out with steam and CO2 as the gasification agent respectively, the variation of the composition of gasification product gas at temperatures from 800 to 1 000℃ was discussed. The experimental results showed that the product gas of gasification of pyrolysis residue is hydrogen-rich gas using steam as gasification agent, the volume percentage of H2 in the product gas increased with the increase of reaction temperature, the content of H2 was up to 68.83%, and that of H2+CO reached 81.36%, and the low heating value is 9.18 MJ·Nm-3. With CO2 as the gasification agent, the main component in the product gas is CO. The higher the temperature, the lager the CO content. It was up to 53.84%, and the low heating value of the product gas is 7.25 MJ·Nm-3 at temperature of 1 000℃.