A method for of reducing the acidity and lowering the acid dewpoint of flue gas, the method steps including partially combusting the fuel in a first stage to create a reducing environment; maintaining the reducing environment for a sufficient time period such that reducible acids are reduced to achi
A method for of reducing the acidity and lowering the acid dewpoint of flue gas, the method steps including partially combusting the fuel in a first stage to create a reducing environment; maintaining the reducing environment for a sufficient time period such that reducible acids are reduced to achieve a desirable acidity concentration in the flue gas; and combusting the remainder of the fuel and combustion intermediates in a second stage with oxidizing environment; thereby decreasing the acidity and lowering the acid dewpoint of the flue gas by reducing the acid concentration of the gas.
대표청구항▼
1. A method of operating a coal-burning power plant combustion system having a stack to lower an acid dewpoint temperature of a flue gas, the method comprising the steps of: obtaining a coal-burning power plant;partially combusting a fuel including coal in a first stage to create a chemically reduci
1. A method of operating a coal-burning power plant combustion system having a stack to lower an acid dewpoint temperature of a flue gas, the method comprising the steps of: obtaining a coal-burning power plant;partially combusting a fuel including coal in a first stage to create a chemically reducing environment in situ, wherein the ratio of the concentration of reducing radicals to oxidizing radicals is greater than about 10;adjusting the reducing environment for a sufficient time period such that the flue gas acid dewpoint temperature is lowered to a temperature lower than the temperature of flue gas traveling through the stack by reducing SO3 formed during combustion to SO2 by electron addition; andcombusting the remainder of the fuel and combustion intermediates in a second stage with an oxidizing environment. 2. The method of claim 1, including the step of micro-staging the first stage fuel combustion. 3. The method of claim 2, wherein the micro-staging is provided through the use of low-NOx burners. 4. The method of claim 1, including the step of macro-staging the first stage of fuel combustion. 5. The method of claim 4, wherein the macro-staging is provided through the use of over-fired air. 6. The method of claim 1, including a combination of micro-staging and macro-staging. 7. The method of claim 6, wherein the micro-staging is provided by low-Nox burners and the macro-staging is provided by over-fired air. 8. The method of claim 1, wherein the fuel is coal having an S content in the range of 0.8% S to 3.0% S, and wherein the oxidizing environment is produced at least in part by over-fired air provided at a percent, based on total air, in the range of 10% to 30%. 9. A method of operating a coal-burning power plant combustion system to decrease the acid dewpoint temperature of its flue gas to a temperature lower than the temperature of flue gas traveling through a stack of the combustion system, the method comprising the steps of: obtaining a coal-burning power plant;partially combusting a fuel including coal in a first stage to create a chemically reducing environment in situ wherein the ratio of the concentration of reducing radicals to oxidizing radicals is greater than about 1;combusting the remainder of the fuel and combustion intermediates in a second stage with an oxidizing environment;measuring the acid dewpoint of the flue gas;measuring the temperature of the flue gas traveling through the stack; andif the measured acid dewpoint temperature is higher than the measured flue gas temperature, adjusting the reducing environment for a sufficient time period such that SO3 formed during combustion is reduced to SO2 by electron addition to decrease the acid dewpoint temperature of the flue gas. 10. The method of claim 9, including the step of micro-staging the first stage fuel combustion. 11. The method of claim 10, wherein the micro-staging is provided through the use of low-NOx burners. 12. The method of claim 9, including the step of macro-staging the first stage of fuel combustion. 13. The method of claim 12, wherein the macro-staging is provided through the use of over-fired air. 14. The method of claim 9, including a combination of micro-staging and macro-staging. 15. The method of claim 14, wherein the micro-staging is provided by low-Nox burners and the macro-staging is provided by over-fired air. 16. The method of claim 9, wherein the fuel is coal having an S content in the range of 0.8% S to 3.0% S, and wherein the oxidizing environment is produced at least in part by over-fired air provided at a percent, based on total air, in the range of 10% to 30%. 17. The method of claim 1, wherein SO3 concentration is adjusted to between 15 to 20 ppm at an ESP component of the combustion system, thereby optimizing ESP function. 18. The method of claim 9, wherein SO3 concentration is adjusted to between 15 to 20 ppm at an ESP component of the combustion system, thereby optimizing ESP function. 19. The method of claim 1, wherein the coal-burning power plant has a load in the range of 70 MWnet to 182 MWnet. 20. The method of claim 8, wherein the coal-burning power plant has a load in the range of 70 MWnet to 182 MWnet.
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