Divided central tube of a combined quenching and scrubbing system for an entrained flow gasification reactor

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, the system comprising

• 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 an injector injects quenching water into the stream of crude gas and liquid slag, and wherein the tube screen is configured in the shape of an upright bell and comprises windings of a tube that are welded gas tight to one another for preventing passage of crude gas through the tube screen,
• 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,
• the crude gas is sprayed from above with quenching water through at least one nozzle ring on a route of the crude gas between the water surface and the crude gas outlet.