Abstract
Most of the sewage sludge generated in usual sewage disposal plants is burned at atmospheric pressure fluidized bed incinerators. In these plants, energy recovery by heat exchange of an exhaust gas and combustion air and defogging air is performed. From the viewpoint of global warming prevention, energy usage of exhaust gas is asked further. In this study, a new energy recovering system from sewage sludge is proposed. This system consists of a pressurized fluidized bed combustor (PFBC) and turbo machinery. The sewage sludge is incinerated in the PFBC and the pressurized high temperature exhaust gas drives a turbine directly. We compared 3 new systems combined of PFBC and turbo machinery with the existing system from a viewpoint of CO_2 emissions and power consumption.
