Patents by Inventor Joanna L. Duncan
Joanna L. Duncan has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 7052662Abstract: A process and apparatus for removing SO2, NO, and NO2 from a gas stream having the steps of oxidizing a portion of the NO in the flue gas stream to NO2, scrubbing the SO2, NO, and NO2 with an alkali scrubbing solution, and removing any alkali aerosols generated by the scrubbing in a wet electrostatic precipitator. The process can also remove Hg by oxidizing it to oxidized mercury and removing it in the scrubbing solution and wet electrostatic precipitator. Alkali sulfates, which are valuable fertilizers, can be withdrawn from the rubbing solution.Type: GrantFiled: June 28, 2002Date of Patent: May 30, 2006Assignee: Powerspan Corp.Inventors: Joanna L. Duncan, Christopher R. McLarnon, Francis R. Alix
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Patent number: 7048899Abstract: A process and apparatus for removing SO2, NO, and NO2 from a gas stream having the steps of oxidizing a portion of the NO in the flue gas stream to NO2, scrubbing the SO2, NO, and NO2 with an ammonia, ammonium hydroxide, alkali hydroxide or carbonate scrubbing solution, regenerating the scrubbing solution with limestone, and removing any particulate matter and aerosols generated by the scrubbing step in a wet electrostatic precipitator. The process can also remove Hg by oxidizing it to oxidized Hg and removing it in the wet electrostatic precipitator. The scrubbing solution is preferably regenerated with limestone or magnesium, and results in a Group II sulfite or sulfate that can be recovered and sold, or landfilled.Type: GrantFiled: August 12, 2002Date of Patent: May 23, 2006Assignee: Powerspan Corp.Inventors: Francis R. Alix, Joanna L. Duncan, Christopher R. McLarnon
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Patent number: 6991771Abstract: A process and apparatus for removing SO2, NO, and NO2 from a gas stream having the steps of oxidizing a portion of the NO in the flue gas stream to NO2, scrubbing the SO2, NO, and NO2 with an ammonia scrubbing solution, and removing any ammonia aerosols generated by the scrubbing in a wet electrostatic precipitator. The process can also remove Hg by oxidizing it to HgO and removing it in the wet electrostatic precipitator. Ammonium sulfate, a valuable fertilizer, can be withdrawn from the scrubbing solution.Type: GrantFiled: December 5, 2003Date of Patent: January 31, 2006Assignee: Powerspan Corp.Inventors: Joanna L. Duncan, Christopher R. McLarnon, Francis R. Alix
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Patent number: 6936231Abstract: A process and apparatus for removing SO2, O, and NO2 from a gas stream having the steps of oxidizing a portion of the NO in the flue gas stream to NO2, scrubbing the SO2, NO, and NO2 with an ammonia scrubbing solution, and removing any ammonia aerosols generated by the scrubbing in a wet electrostatic precipitator. The process can also remove Hg by oxidizing it to HgO and removing it in the wet electrostatic precipitator. Ammonium sulfate, a valuable fertilizer, can be withdrawn from the scrubbing solution.Type: GrantFiled: December 6, 2001Date of Patent: August 30, 2005Assignee: Powerspan Corp.Inventors: Joanna L. Duncan, Christopher R. McLarnon, Francis R. Alix
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Publication number: 20040105802Abstract: A process and apparatus for removing S02, NO, and N02 from a gas stream having the steps of oxidizing a portion of the NO in the flue gas stream to N02, scrubbing the S02, NO, and N02 with an ammonia scrubbing solution, and removing any ammonia aerosols generated by the scrubbing in a wet electrostatic precipitator. The process can also remove Hg by oxidizing it to HgO and removing it in the wet electrostatic precipitator. Ammonium sulfate, a valuable fertilizer, can be withdrawn from the scrubbing solution.Type: ApplicationFiled: December 5, 2003Publication date: June 3, 2004Applicant: POWERSPAN CORP.Inventors: Joanna L. Duncan, Christopher R. McLarnon, Francis R. Alix
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Publication number: 20030175190Abstract: A process and apparatus for removing SO2, O, and NO2 from a gas stream having the steps of oxidizing a portion of the NO in the flue gas stream to NO2, scrubbing the SO2, NO, and NO2 with an ammonia scrubbing solution, and removing any ammonia aerosols generated by the scrubbing in a wet electrostatic precipitator. The process can also remove Hg by oxidizing it to HgO and removing it in the wet electrostatic precipitator. Ammonium sulfate, a valuable fertilizer, can be withdrawn from the scrubbing solution.Type: ApplicationFiled: December 6, 2001Publication date: September 18, 2003Applicant: Powerspan Corp.Inventors: Joanna L. Duncan, Christopher R. McLarnon, Francis R. Alix
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Patent number: 6605263Abstract: A process and apparatus for removing SO2 from a gas stream having the steps of scrubbing the SO2 with an ammonia scrubbing solution and removing any aerosols generated by the scrubbing in a wet electrostatic precipitator. The scrubbing solution is maintained at a pH between 6 and 8 to increase the speed of absorption of SO2, to Increase the ratio of sulfite to bisulfite which also facilitates the oxidation of SO2, and to avoid the need to use exotic, corrosion resistant alloys. Ammonium sulfate, a valuable fertilizer, can be withdrawn from the scrubbing solution.Type: GrantFiled: January 31, 2002Date of Patent: August 12, 2003Assignee: Powerspan Corp.Inventors: Francis R. Alix, Joanna L. Duncan, Christopher R. McLarnon
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Publication number: 20030108466Abstract: A process and apparatus for removing SO2, NO, and NO2 from a gas stream having the steps of oxidizing a portion of the NO in the flue gas stream to NO2, scrubbing the SO2, NO, and NO2 with an ammonia, ammonium hydroxide, alkali hydroxide or carbonate scrubbing solution, regenerating the scrubbing solution with limestone, and removing any particulate matter and aerosols generated by the scrubbing step in a wet electrostatic precipitator. The process can also remove Hg by oxidizing it to oxidized Hg and removing it in the wet electrostatic precipitator. The scrubbing solution is preferably regenerated with limestone or magnesium, and results in a Group II sulfite or sulfate that can be recovered and sold, or landfilled.Type: ApplicationFiled: August 12, 2002Publication date: June 12, 2003Applicant: Powerspan Corp.Inventors: Francis R. Alix, Joanna L. Duncan, Christopher R. McLarnon
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Publication number: 20030108472Abstract: A process and apparatus for removing SO2, NO, and NO2 from a gas stream having the steps of oxidizing a portion of the NO in the flue gas stream to NO2, scrubbing the SO2, NO, and NO2 with an alkali scrubbing solution, and removing any alkali aerosols generated by the scrubbing in a wet electrostatic precipitator. The process can also remove Hg by oxidizing it to oxidized mercury and removing it in the scrubbing solution and wet electrostatic precipitator. Alkali sulfates, which are valuable fertilizers, can be withdrawn from the rubbing solution.Type: ApplicationFiled: June 28, 2002Publication date: June 12, 2003Applicant: Powerspan Corp.Inventors: Joanna L. Duncan, Christopher R. McLarnon, Francis R. Alix
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Publication number: 20030108469Abstract: A process and apparatus for removing SO2 from a gas stream having the steps of scrubbing the SO2 with an ammonia scrubbing solution and removing any aerosols generated by the scrubbing in a wet electrostatic precipitator. Ammonium sulfate, a valuable fertilizer, can be withdrawn from the scrubbing solution.Type: ApplicationFiled: January 31, 2002Publication date: June 12, 2003Applicant: Powerspan Corp.Inventors: Francis R. Alix, Joanna L. Duncan, Christopher R. McLarnon