Experimental Study About Pyrolysis of Sludge in a Fixed-Bed Reactor

摘要

By pyrolysis, dealing with sludge is very efficient, safe and economic. In order to investigate the pyrolysis characteristic of sludge, a series of experiments were carried out in an external heating fixed-bed reactor at different pyrolysis temperatures. The results show that the major constituent of pyrolysis gas is CO_2, CH4 and H_2, and the yield rises with increasing temperature. The calorific value of pyrolysis gas can be up to 12.5MJ/m~3 at 600°C. The yield of pyrolysis gas is about 2.34%~6%, and the yield rises with the increasing temperature. The major constituent of pyrolysis carbon is ash. The yield of ash is about 67%~72%, and the yield decreases with the increasing temperature. The pyrolysis liquid of sludge is a kind of fetid liquid which has the upper and lower layers. The yield of pyrolysis liquid is about 29%~31%, and the yield is less affected by pyrolysis temperature.