DIVIDED CENTRAL TUBE OF A COMBINED QUENCHING AND SCRUBBING SYSTEM FOR AN ENTRAINED FLOW GASIFICATION REACTOR

摘要

Devices for a three-stage scrubbing system for treatment of hot crude gases and liquid slag by an entrained flow gasification. Crude gas and slag are conducted downward into a water bath in a central tube. The upper part of the central tube consists of a double-threaded tube screen welded in a gas-tight manner, in which water is injected directly as the first scrubbing and cooling stage in the interior thereof. In the water bath, a bubble column is formed, which simultaneously constitutes the second scrubbing and cooling stage. Surface bodies arranged in three layers increase the scrubbing effect. After leaving the bubble column, the crude gas is again sprayed with water in a cavity, wherein one or more nozzle rings are disposed. This forms the third scrubbing stage. The crude gas then leaves the quenching and scrubbing apparatus in steam-saturated form at 200-220° C. and is sent to further treatment.

主权项

1. A crude gas scrubbing system configured and operable for having a high separation level of particles in an entrained flow gasification unit for the reaction of ash-containing fuels with a gasifying agent containing free oxygen to give a crude gas having a high hydrogen content, in which
a gasification reactor operable at temperatures of 1200 to 1900° C. and process pressures up to 10 MPa for processing the fuel through the reactor and for converting the fuel to crude gas and liquid slag, a quencher arranged beneath the gasification reactor, a gas and slag outlet from the reactor into the quencher for transferring the crude gas and liquid slag into the quencher, a central tube in the quencher and connected to the gas and slag outlet and the central tube also dips into a water bath at a lower end of the quencher, an upper section of the central tube comprises a tube screen through which cooling water flows, and a lower section of the central tube comprises a smooth tube, in the region of the tube screen injector injects quenching water into the stream of crude gas and liquid slag, at the lower end of the central tube the slag is separated out into the water bath and the crude gas rises upward within a bubble column outside the central tube, a crude gas outlet in the pressure casing of the quencher through which the crude gas leaves the quencher, at least one nozzle ring on the quencher between the surface of the water bath and the crude gas outlet and the at least one nozzle ring is configured for spraying the crude gas with quenching water.