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A method of minimizing the production of SOx and NOx in the burning of a fuel containing significant amounts of SOx and NOx precursors in which the fuel is treated to remove significant amounts of SOx precursors without the removal of significant amounts of NOx precursors and the fuel is thereafter

A method of minimizing the production of SOx and NOx in the burning of a fuel containing significant amounts of SOx and NOx precursors in which the fuel is treated to remove significant amounts of SOx precursors without the removal of significant amounts of NOx precursors and the fuel is thereafter burned in a two-stage, rich-lean burning step in which significant amounts of the NOx precursors are converted to N2. Treating the fuel to remove SOx precursors is preferrably carried out in the presence of an oxidizing agent, such as H2O2, a reducing agent, such as hydrogen, and/or steam, and still more preferably, the oxidizing agent, the reducing agent and steam are generated by burning an auxiliary fuel and passing the effluent thereof to the step of treating the fuel to remove SOx precursors.

대표청구항 ▼

A method for minimizing the production of SOx and NOx in the burning of a primary fuel containing significant amounts of SOx and NOx precursors, comprising: (a) burning an auxiliary fuel in the presence of a combustion supporting material, sufficient to supply oxygen in an amount greater than the st

A method for minimizing the production of SOx and NOx in the burning of a primary fuel containing significant amounts of SOx and NOx precursors, comprising: (a) burning an auxiliary fuel in the presence of a combustion supporting material, sufficient to supply oxygen in an amount greater than the stoichiometric amount necessary to burn all of said auxiliary fuel, and for a residence time sufficient to produce significant amounts of hydrogen and abruptly terminating said step of burning said auxiliary fuel, before significant amounts of other products are formed from the thus produced hydrogen, to produce an auxiliary fuel effluent containing significant amounts of hydrogen; (b) contacting said primary fuel with said auxiliary effluent in a hydrodesulfurization step, under conditions sufficient to remove significant amounts of SOx precursors from said primary fuel but insufficient to remove significant amounts of said NOx precursors from said primary fuel, to produce a primary fuel containing significant amounts of NOx precursors and reduced amounts of SOx precursors; (c) carrying out fuel-rich combustion by burning the thus hydrodesulfurized primary fuel in a combustion zone in the presence of a combustion supporting material, sufficient to supply oxygen in an amount less than the stoichiometric amount necessary to burn all of said primary fuel, and for a residence time sufficient to convert a major portion of said NOx precursors to N2, to produce an effluent containing significant amounts of N2 and unburned and partially burned fuel; (d) abruptly terminating said fuel-rich combustion and initiating fuel-lean combustion; and (e) carrying out fuel-lean combustion of said effluent containing significant amounts of unburned and partially burned fuel by burning said effluent in the presence of an additional amount of combustion supporting material, sufficient to supply oxygen in an amount sufficient to provide an overall amount of oxygen at least as great as the stoichiometric amount necessary to burn all of said primary fuel, and for a residence time sufficient to essentially complete the combustion of said primary fuel, to produce a flue gas predominating in N2 and CO2 and containing substantially reduced amounts of SOx and NOx.