Apparatus and method for enhancing the performance of a particulate collection device
Patent 5567226 Issued on October 22, 1996. Estimated Expiration Date: 
November 14, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
November 14, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 1291745 2356717 3523407 3665676 3782905 Method of conditioning flue gas to electrostatic precipitator Method of conditioning flue gas to electrostatic precipitator Method of injecting ammonia into a flue for waste gases Method and apparatus for conditioning flue gas with a mist of H2 SO4 Dry impact capture of aerosol particulates InventorsApplicationNo. 338362 filed on 11/14/1994US Classes:95/3, Concentration sensed95/58, With addition of solid, gas, or vapor96/52, With means for vapor or liquid contact (e.g., for gas separation, cooling, conditioning, etc.)96/53, Liquid spray means96/74, With nonelectrical gas treating or conditioning means110/345, Exhaust gas; e.g., pollution control, etc.423/243.06Ammonium compound reactantExaminersPrimary: Chiesa, Richard L.Attorney, Agent or FirmInternational ClassB03C 003/013AbstractThe present invention provides an apparatus and method to improve the performance of a variety of particulate collection devices. Gaseous ammonia is injected by one or more injectors into a waste gas upstream from a particulate collection device. The amount of ammonia injected from each injector is controlled so that the local concentration of ammonia in the waste gas is approximately the same as the corresponding local concentration of sulfur trioxide in the waste gas. The flow of ammonia from each injector is controlled by measuring several local sulfur trioxide concentrations in the waste stream after the ammonia has been injected. The sulfur trioxide can occur naturally or result from injection. By keeping the concentration of ammonia approximately equal to the concentration of sulfur trioxide, ammonia and sulfur trioxide react to form a liquid product. This liquid reaction product coats the surfaces of particles entrained in the gas stream. Once coated, the particles' electrical conductivity is altered so that they are more easily collected by devices employing electrostatic attraction. The liquid coating also causes the particles to agglomerate and these larger agglomerates are easier to collect.Other References
Field of SearchWith addition of solid, gas, or vaporConcentration sensed Concentration sensed Ammonium compound reactant Electrostatic field or electrical discharge With means for vapor or liquid contact (e.g., for gas separation, cooling, conditioning, etc.) Liquid spray means With nonelectrical gas treating or conditioning means Exhaust gas; e.g., pollution control, etc. FLEXIBLE OR COLLAPSIBLE BAG TYPE MULTIPLE BAG TYPE FILTERS IN CHAMBER |
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