System and method for semi-coke blending combustion of coal-fired power plant with Brown gas for catalytic combustion supporting

• Main Authors: WANG PENGQIAN, JIN LIYAN, WANG CHANG'AN, WANG CHAOWEI, CHE DEFU
• Format: Patent
• Language: Chinese; English
• Published: 03.12.2019
• Subjects: AIR; AIR SUPPLY; BLASTING; COMBINED HEATING AND REFRIGERATION SYSTEMS; COMBUSTION APPARATUS; COMBUSTION PROCESSES; DRAUGHT-INDUCING; HEAT EXCHANGE IN GENERAL; HEAT PUMP SYSTEMS; HEATING; LIGHTING; LIQUEFACTION SOLIDIFICATION OF GASES; LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS; MANUFACTURE OR STORAGE OF ICE; MECHANICAL ENGINEERING; METHODSOR APPARATUS FOR COMBUSTION USING FLUID FUELOR SOLID FUEL SUSPENDED IN; MIXTURES BY PRESSURE AND COLD TREATMENT; REFRIGERATION OR COOLING; STEAM OR VAPOUR CONDENSERS; SUPPLYING NON-COMBUSTIBLE LIQUID OR GAS; WEAPONS

The invention discloses a system and a method for semi-coke blending combustion of a coal-fired power plant with Brown gas for catalytic combustion supporting. Low-rank coal pyrolysis semicoke and bituminous coal are subjected to mixed combustion, the Brown gas is distributed at a primary air nozzle in a sandwich air mode for catalytic combustion supporting on the semicoke, so that the problems that the semicoke is difficult to burn and poor in burnout performance can be effectively solved. Oxygen-rich air generated by a cryogenic air separation nitrogen making machine is preheated through smoke and then serves as oxygen-rich over-fire air, and the excess air coefficient of the main combustion area is controlled to be 0.8 or below, so that the reducibility of the main combustion area is enhanced, sufficient combustion of fuel can be guaranteed while NOx emission is effectively controlled, and the combustion efficiency of the boiler is improved. Flue gas and exhaust steam of a steam turbine are condensed throu