Dust separation from the crude gas of an entrained flow gasifier

摘要

A multistage gas washing system is applied for dust separation from crude gases of entrained flow gasification of pulverized fuels under pressures up to 10 MPa and temperatures which are greater than the melting point of the fuel ash. A first stage comprises a modified quenching system and a downstream washing column, which operates as a bubble column. A second washing stage comprises one or more Venturi washers connected in series. A third washing stage comprises multiple high-pressure atomization units of washing water, a partial condenser for cooling the crude gas by 1 to 15° C. with condensate formation, and a separation column, which is equipped with washing surfaces and a plastic-coated demister.

主权项

1. A multistage crude gas washing apparatus for an entrained flow gasification plant comprising:
an entrained gas flow gasification chamber configured to operate at pressures up to 10 MPa and temperatures up to 1900° C. to produce a crude gas; a first crude gas washing stage having a quenching chamber connected downstream of the gasification chamber and configured to coarsely purify the crude gas generated in the gasification chamber, the first stage including injecting devices configured to inject water into the crude gas, cool the crude gas to a temperature between 150 and 250° C., and saturate the crude gas with water vapor; a washing column located downstream of the quenching chamber, the washing column having a bottom part having a water bath, the washing column configured to cause the crude gas to flow through the water bath as a bubble column; a second crude gas washing stage located downstream of the washing column, the second crude gas washing stage including at least one Venturi washer for the crude gas and a washing water separator located downstream of the at least one Venturi washer and configured to separate washing water from the crude gas flow; a third crude gas washing stage located downstream of the water separator, the third crude gas washing stage having a high-pressure injection nozzle configured to inject finely-dispersed washing water that is free of solid material into the crude gas; and a demister located within the third crude gas washing stage.