WIRBELSCHICHTFEUERUNG

摘要

The invention relates to a fluidised-bed combustion system, in particular for burning sorted, comminuted domestic refuse and domestic-refuse-like waste and sewage sludge, in which fluidised-bed combustion system fluidising gas is fed to the fuel bed through a tuyere bottom, in the reactor compartment of which fluidised-bed combustion system an eddy zone and a zone more or less free of solids result, to which is connected a gas flue equipped with ancillary heating surfaces. In order to be able almost completely to burn fuel having different calorific values and burn-off behaviour, such as domestic refuse, domestic-refuse-like waste and sewage sludge, and, at the same time, to oppose corrosion in the heating surfaces connected downstream, a) connected to the slightly inclined tuyere bottom is a likewise slightly inclined feed grid on the discharge end of which is arranged a swinging ash cut-off gate, b) the tuyere bottom and the feed grid are connected to separate combustion-air feed means or fluidising-medium feed means, c) the reactor cross-section is widened above the secondary air feed means, and overfire air nozzles are arranged above the widening. In an alternative configuration of the invention, the fluidised-bed combustion system is provided with a particle separator arranged between the burner and the back path.