Portland cement for SO.sub.2 control in coal-fired power plants

• US 4,555,392 A
• Filed: 10/17/1984
• Issued: 11/26/1985
• Est. Priority Date: 10/17/1984
• Status: Expired due to Fees

• Current Assignee: United States Department of Energy
• Original Assignee: United States Department of Energy
• Inventors: Steinberg, Meyer
• Primary Examiner(s): Heller, Gregory A.
• Application Number:
  US06/661,842
• Time in Patent Office: 405 Days
• Field of Search: 423/242 A, 423/242 R, 423/244 A, 423/244 R, 110/343, 110/345
• US Class Current: 423/244.05
• CPC Class Codes: B01D 53/508 by treating the gases with solids
• CPC Class Codes: C04B 7/28 from combustion residues, e.g. ashes or slags from waste incinerationC04B7/243 , C04B7/26 take precedence
• CPC Class Codes: C10L 9/10 by using additives
• CPC Class Codes: F23J 7/00 Arrangement of devices for supplying chemicals to fire
• CPC Class Codes: Y02P 40/10 Production of cement, e.g. improving or optimising the production methods; Cement grinding

Abstract

There is described a method of removing oxides of sulfur from the emissions of fossil fuel combustion by injecting portland cement into the boiler with the fuel, the combustion air, or downstream with the combustion gases. There is also described the cement products that result from this method.

Claims

1. A method for reducing the sulfur dioxide emissions produced from the burning of fossil fuels which comprises directly injecting into a furnace boiler portland cement particles, in sufficient quantity so that the amount of portland cement present will be from about 2.8 to 5.6 times the amount of sulfur in the fuel being burned, based on the weight of the fuel, so that said cement particles react with said sulfur dioxide and remove said sulfur dioxide from the exhaust gas before the exhaust gas exits the boiler system.

2. A method as in claim 1, wherein the portland cement is injected into the system with the fossil fuel.

3. A method as in claim 1, wherein the portland cement is injected into the system with the combustion air.

4. A method as in claim 1, wherein the portland cement is injected into the combustion gases of the system.

5. A method as in claim 1, wherein the portland cement is type III portland cement.