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To solve the high NOx emissions associated with a 600 MWe utility boiler with enhanced-ignition axial control low NOx (EI–XCL) burners, continuous improvement of the previously proposed centrally fuel-rich (CFR) burner technology lies on three aspects: (1) the 36 EI–XCL burners in the original furnace were retrofitted with CFR burners; (2) the 26 over fire air (OFA) ports in two layers have been added...
The influence of using sub-stoichiometric ratios on pulverized-coal combustion and NO formation and reduction in a pulverized-coal combustion test system with a swirl burner was investigated. Local gas components, gas temperature, the char burnout rate, and carbon and nitrogen release rates were measured at different positions in the test facility. A method for determining the fuel-rich zone boundary...
The progression of ignition was numerically simulated with the aim of realizing a full-scale tiny-oil ignition burner that is identical to the burner used in an 800MWe utility boiler. The numerical simulations were conducted for four excess air ratios, 0.56, 0.75, 0.98 and 1.14 (corresponding to primary air velocities of 17, 23, 30 and 35 m/s, respectively), which were chosen because they had been...
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