Powerspan Corp.

Tecogen, Inc.

Zero Emissions Technology Inc.

Thermo Power Corporation

Christopher R McLarnon

Francis R Alix

Joanna L Duncan

S Edward Neister

Ronald W Breault

Virendra K Mathur

Frank G Medros

Frederick E Becker

Phillip D Boyle

A process and apparatus for removing SO, NO, and NOfrom a gas stream having the steps of oxidizing a portion of the NO in the flue gas stream to NO, scrubbing the SO, NO, and NOwith 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 Alkali sulfates, which are valuable fertilizers, can be withdrawn from the rubbing solution.

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A process and apparatus for removing SO, NO, and NOfrom a gas stream having the steps of oxidizing a portion of the NO in the flue gas stream to NO, scrubbing the SO, NO, and NOwith 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.

A process and apparatus for removing SO, NO, and NOfrom a gas stream having the steps of oxidizing a portion of the NO in the flue gas stream to NO, scrubbing the SO, NO, and NOwith 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 Ammonium sulfate, a valuable fertilizer, can be withdrawn from the scrubbing solution.

A process and apparatus for removing SO, O, and NOfrom a gas stream having the steps of oxidizing a portion of the NO in the flue gas stream to NO, scrubbing the SO, NO, and NOwith 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.

NOx, Hg, and SO2 removal using ammonia

A process and apparatus for removing SO from a gas stream having the steps of scrubbing the SO 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 SO , to Increase the ratio of sulfite to bisulfite which also facilitates the oxidation of SO , and to avoid the need to use exotic, corrosion resistant alloys. Ammonium sulfate, a valuable fertilizer, can be withdrawn from the scrubbing solution.

Sulfur dioxide removal using ammonia

A process for reducing particulate, Hg, NOx, and SO.sub.2 emissions from the combustion of fossil fuel while providing the capability of producing an end product that is commercially useful comprising the steps of oxidizing Hg, NOx and SO.sub.2 using a barrier discharge reactor to produce the HgO and acids HNO.sub.3 and H.sub.2 SO.sub.4, collecting the HgO, acids and particulates in a wet ESP, and then draining them from the wet ESP to remove them from the flue gas stream.

Barrier discharge conversion of SO.sub.2 and NOx to acids

Barrier discharge conversion of Hg, SO.sub.2 and NOx

A process and apparatus for reducing particulate, nitrogen oxides ('NOx'), sulfur dioxide ('SO.sub.2 '), and mercury ('Hg') emissions from the combustion exhaust of fossil fuel fired plants while producing an end product that is commercially useful, comprising the steps of oxidizing Hg, NOx and SO.sub.2 using a barrier, pulse, corona, or electron beam electrical discharge apparatus to produce HgO and the acids HNO.sub.3 and H.sub.2 SO.sub.4, collecting the HgO, acids and particulates in a wet ESP, and separating the particulates from the collected acid mixture, then separating and concentrated the acids for industrial use.

Barrier discharge conversion of SO.sub.2  and NOx to acids

This invention presents an NO.sub.x environment effective reduction apparatus comprising a sulfur tolerant, high water vapor (about 3% to about 18%) tolerant, packing-free coronal-catalyst. In one embodiment the invention comprises an NO.sub.x reduction apparatus of high water vapor tolerant coronal-catalyst adapted and configured for hypercritical presentation of an electrical field to an NO.sub.x bearing gas stream, where the electrical field has a minimum field power density of at least about 75 watts/cubic meter, and optionally, accompanying downstream scrubbers. In a particular embodiment, downstream wet or dry absorption arrest particular NO.sub.x reduction products NO.sub.2 and HNO.sub.3, optionally upon exposure to an arresting agent, including basic, caustic, or alkali materials such as CaO or NH.sub.3.

Coronal-catalytic apparatus and method for NO.sub.x reduction

This invention presents an NO.sub.x environment effective reduction apparatus comprising a sulfur tolerant coronal-catalyst such as high dielectric coronal-catalysts like glass wool, ceramic-glass wool or zirconium glass wool and method of use. In one embodiment the invention comprises an NO.sub.x reduction apparatus of sulfur tolerant coronal-catalyst adapted and configured for hypercritical presentation to an NO.sub.x bearing gas stream at a minimum of at least about 75 watts/cubic meter.

Growing community of inventors

Exeter, NH, United States of America

Christopher R McLarnon