Method and device for producing synthesis gases by partial oxidation of slurries prepared from fuels containing ash and full quenching of the crude gas
View Patent ↗A method and device for the gasification of solid fuels such as bituminous coals, and cokes such as those from bituminous coals, lignite coals, and biomasses, as well as petroleum cokes, that are ground fine and mixed with water or oil to obtain fuel-in-liquid suspensions, so-called slurries, and their gasification together with an oxidizing medium containing free oxygen, by partial oxidation at pressures between atmospheric pressure and 100 bar, and at temperatures between 1200 and 1900° C. in an entrained flow reactor. The method includes slurry preparation and infeed to the reactor, gasification in an entrained flow reactor with cooled reaction chamber contour, full quenching of the crude gas to saturation temperature that may be 180-260° C. depending on the gasification pressure, and wet or dry dust separation. The crude gas is pretreated so that it can be fed to further technological steps such as crude gas conversion, H 2 S and CO 2 removal, and synthesis.
1. A device for the gasification of solid fuels such as bituminous coals and cokes such as bituminous or lignite coke, biomass coke, and petroleum coke in the entrained flow with an oxidizing medium containing free oxygen, comprising:
a system for preparing and feeding slurry made from slurry fuel with a grain size of <200 μm, water and added surfactant, such that the slurry has a solids concentration of 40-70 wt %;
a reactor for the gasification of supplied powdered fuel with an oxidizing medium containing free oxygen, said reactor operating at a pressure between atmospheric pressure and 100 bar and at a temperature between 1200 and 1900° C. and comprising a supply pipe for slurried fuel received from said system and a line for the oxidizing medium, which is fed by burners into a reaction chamber having a cooling shield consisting of water-cooled pipes welded gas-tight and an outlet device;
a quenching cooler with no internals, said quenching cooler being connected to the reactor and having nozzles arranged in one or more nozzle rings through which is sprayed water for quenching, said nozzles being flush with an inner jacket; and
a gas cleanser comprising a crude gas scrubber and partial condenser, or a device for dry dust separation, connected to the quenching cooler.
2. A device pursuant to claim 1 , wherein there is an opening in the quenching cooler for the crude gas, and an opening for slag with a water bath.
3. A device pursuant to claim 1 , wherein there are a crude gas scrubber and a partial condenser as the gas cleanser.
4. A device pursuant to claim 3 , wherein the crude gas scrubber comprises a single- or multiple-stage Venturi scrubber.
5. A device pursuant to claim 1 , wherein the gas cleanser is a mechanical dry dust separator.
6. A device pursuant to claim 1 , further comprising a crude gas converter or a desulfurization system following the gas cleanser.