Methods for removing air pollutants from combustion flue gas
First Claim
1. A method for removing gas components from a combustion flue gas including one or more of NO, SO3, CO, light hydrocarbons, and mercury vapor, the method comprising the step of contacting the combustion flue gas with an injection liquid including atomized droplets of a mixture of aqueous hydrogen peroxide solution having a concentration from about 1% to about 50% and methanol in an amount such that the mole ratio of the sum of the hydrogen peroxide and methanol to the sum of any such NO, SO3, CO, light hydrocarbons and mercury vapor contained in the combustion flue gas is in a range from about 0.5 to about 2, and the concentration of the mixture of hydrogen peroxide and methanol in the combustion flue gas is less than about 1000 ppm, at a flue gas temperature in a range from about 650 K (377°
- C.) to about 1100 K (827°
C.), wherein the mixture of hydrogen peroxide and methanol substantially converts any NO, SO3, CO, light hydrocarbons, and mercury vapor in the combustion flue gas to NO2, SO2, CO2, and HgO by a chain propagating reaction in the combustion flue gas.
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Abstract
A method is provided for preventing the release of air pollutants with combustion flue gases emitted to the atmosphere by the removal of one or more of nitric oxide, sulfur trioxide, light hydrocarbons, carbon monoxide, and trace amounts of mercury from combustion flue gas streams. The method converts nitric oxide to nitrogen dioxide, sulfur trioxide to sulfur dioxide, removes light hydrocarbons in the form of carbon dioxide, reduces the concentration of carbon monoxide, and removes mercury vapor in the form of mercury oxide, by the addition of hydrogen peroxide or a mixture of hydrogen peroxide and methanol to a combustion flue gas at a temperature in the range from about 650 K (377° C.) to 1100 K (827° C.).
169 Citations
24 Claims
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1. A method for removing gas components from a combustion flue gas including one or more of NO, SO3, CO, light hydrocarbons, and mercury vapor, the method comprising the step of contacting the combustion flue gas with an injection liquid including atomized droplets of a mixture of aqueous hydrogen peroxide solution having a concentration from about 1% to about 50% and methanol in an amount such that the mole ratio of the sum of the hydrogen peroxide and methanol to the sum of any such NO, SO3, CO, light hydrocarbons and mercury vapor contained in the combustion flue gas is in a range from about 0.5 to about 2, and the concentration of the mixture of hydrogen peroxide and methanol in the combustion flue gas is less than about 1000 ppm, at a flue gas temperature in a range from about 650 K (377°
- C.) to about 1100 K (827°
C.), wherein the mixture of hydrogen peroxide and methanol substantially converts any NO, SO3, CO, light hydrocarbons, and mercury vapor in the combustion flue gas to NO2, SO2, CO2, and HgO by a chain propagating reaction in the combustion flue gas. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- C.) to about 1100 K (827°
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13. A method for removing gas components from a combustion flue gas including one or more of NO, SO3, CO, light hydrocarbons, and mercury vapor, the method comprising the step of contacting the combustion flue gas with an injection liquid including atomized droplets of a mixture of aqueous hydrogen peroxide solution having a concentration from about 10% to about 30% and methanol in an amount such that the mole ratio of the sum of the hydrogen peroxide and methanol to the sum of any such NO, SO3, CO, light hydrocarbons and mercury vapor contained in the combustion flue gas is in a range from about 0.5 to about 2, and the concentration of the mixture of hydrogen peroxide and methanol in the combustion flue gas is less than about 500 ppm, at a flue gas temperature in a range from about 650 K (377°
- C.) to about 1100 K (827°
C.), wherein the mixture of hydrogen peroxide and methanol substantially converts any NO, SO3, CO, light hydrocarbons, and mercury vapor in the combustion flue gas to NO2, SO2, CO2, and HgO by a chain propagating reaction in the combustion flue gas. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
- C.) to about 1100 K (827°
Specification