Incinerador de leito fluidizado para lama, e, método de incineração em leito fluidizado para lama

摘要

An inside of an incinerator body 1 into which sludge is fed is divided into a lower portion, a portion above the lower portion, and a top portion in a height direction. The lower portion serves as a pyrolysis zone 3 for supplying fluidizing air having an air ratio of 1.1 or less together with fuel to thermally decompose the sludge while fluidizing the sludge. The portion above the lower portion serves as an over bed combustion zone 4 for supplying only combustion air having an air ratio of 0.1 to 0.3 to form a local high temperature place to decompose N 2 O. The top portion serves as a perfect combustion zone 5 for perfectly combusting unburned contents. The quantity of N 2 O generated during sludge incineration can be drastically reduced while maintaining the use quantity of auxiliary fuel at the same level as that of a conventional incineration method. When an auxiliary fuel reaction zone 10 for supplying only the auxiliary fuel between the pyrolysis zone 3 and the bed upper combustion zone 4 to decompose N 2 O is formed, the quantity of N 2 O generated can be further reduced.