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...When G.G. Hubbard learned of his future son-in-law's invention, he called it "only a toy." His daughter was engaged to a young man named Alexander Graham Bell.
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| Number | Title | Issue Date |
| 7351387 | Method for removing impurities accumulated in a scrubbing fluid A method for removing impurities accumulated in a scrubbing fluid in a flue gas scrubber and effluents from the scrubber. The flue gases are scrubbed with a scrubbing fluid that includes a calcium-containing absorbent. The scrubbing fluid containing gypsum and other... | 04/01/2008 |
| 7334415 | Cooling system and method for using cooling system A cooling system is provided having a first heat exchanger for heating a cooling liquid, a second heat exchanger, which preferably comprises an evaporator, for cooling the cooling liquid, and a pump for guiding the cooling liquid through the first and second heat ex... | 02/26/2008 |
| 7247284 | Method and apparatus for regeneration of flue gas scrubber caustic solutions A process to regenerate wet flue gas scrubber purge liquid into NaOH caustic suitable for make-up caustic for the scrubber is disclosed. Further, sulfur is removed from waste effluent in the form of gypsum with the process described herein. Lime is added to the spen... | 07/24/2007 |
| 7179438 | Methods and apparatus for recovering gypsum and magnesium hydroxide The present invention provides methods and apparatus for treating flue gas containing sulfur dioxide using a scrubber, and more particularly relates to recovering gypsum and magnesium hydroxide products from the scrubber blowdown. The gypsum and magnesium hydroxide ... | 02/20/2007 |
| 7153481 | Method and device for separating sulphur dioxide from a gas A device (1) for separating sulphur dioxide from a gas (4) by means of an absorption liquid has an inlet (2) for gas (4) containing sulphur dioxide, an outlet (18) for gas (16), from which sulphur dioxide has been separated,... | 12/26/2006 |
| 7094382 | Method and a device for the separation of sulphur dioxide from a gas A device (1) for separating sulphur dioxide from a gas has an inlet (2) for the gas (4) and an outlet (42) for gas (40), from which sulphur dioxide has been separated. An apertured plate (20) is arranged between the inlet ( | 08/22/2006 |
| 7048899 | Removing NOx, SO, and Hg from a gas stream using limestone regeneration 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 h... | 05/23/2006 |
| 6997119 | Combustion emissions control and utilization of byproducts A process for controlling both fireside ash deposits and corrosion, and fouling, corrosion, and emissions due to SO3 formation within a fossil-fuel-fired combustion system, such as a furnace forming part of an electrical power generating plant. A solution... | 02/14/2006 |
| 6932952 | Method and apparatus for wet type flue-gas desulfurization A wet type exhaust gas desulfurization method includes sucking liquid in a liquid reservoir containing a sulphur compound formed from sulphur dioxide contained in exhaust gas so as to form a flow of the liquid, reducing the flow of the liquid in diameter to form a d... | 08/23/2005 |
| 6863875 | Flue gas treating system and process In a flue gas treating system, an absorption tower (21), a reheating section (22) and a fan (23) are arranged in line on a vertical axis so as to function as at least a part of a stack for emitting the treated flue gas into the atmosphere. Moreo... | 03/08/2005 |
| 6793740 | Method for cleaning pressurized containers containing moisture sensitive chemicals The present invention relates to a method for cleaning a pressurized container having at least one chemical contained therein. The pressurized container may be any type of container able to store chemicals under pressure. Preferably, however, the container is a rail... | 09/21/2004 |
| 6572832 | Method of removing sulfur dioxide from a gaseous stream in a wet scrubbing unit Sulfur dioxide is removed from a gaseous stream using an aqueous scrubbing slurry of magnesium and calcium scrubbing components where the process is carried out where lime and magnesium hydroxide are blended to give a molar ratio of between about 1.0 to 2... | 06/03/2003 |
| 6555082 | Method for wet flue gas desulfurization and device for implementing said method A method and apparatus for wet flue gas desulfurization in a two-circuit washer having two washers for an absorption agent based on suspensions containing calcium compounds, a sump for supplying the absorption agent to the first washer, and a container fo... | 04/29/2003 |
| 6254843 | Process for the reclamation of calcium sulfite produced by a calcium-based FGD system A method of producing calcium sulfate with a flue gas scrubbing facility having a gas-liquid contactor that uses a calcium-based slurry to absorb sulfur dioxide from a flue gas containing acidic gases, wherein a byproduct containing calcium sulfite precip... | 07/03/2001 |
| 6126910 | Method for removing acid gases from flue gas A method is provided for removing contaminants, such as sulfur trioxide, sulfur dioxide and hydrogen halides, out of a gas, such as an exhaust gas from a coal or oil fired burner, by injecting a bisulfite containing solution into the gas so that the bisul... | 10/03/2000 |
| 6099816 | Process for desulfurizing a sulfur-dioxide containing gas A desulfurization process using magnesium sulfites in a clear solution has the discharge from a wet scrubbing unit passed to a reaction tank. A silica-containing solid particulate material, such as sand, is added to the reaction tank and lime is added to ... | 08/08/2000 |
| 6030494 | Method of treating melodorous gases of a pulp mill A method is provided for reducing emissions of harmful nitrogen compounds from a pulp mill (e.g. kraft mill) having malodorous gases which include ammonia and reduced sulphur compounds therein. The method is practiced by (a) treating the pulp mill malodor... | 02/29/2000 |
| 5614158 | Process for removing sulfur dioxide from gases and producing gypsum and purified magnesium hydroxide In a process for removing sulfur dioxide from a gas stream using an aqueous solution of magnesium scrubbing components and subsequent oxidation of the magnesium sulfite produced which is regenerated by addition of lime, a pure magnesium hydroxide product ... | 03/25/1997 |
| 5605552 | Wet type flue gas desulfurization apparatus A wet type flue gas desulfurization apparatus in which desulfurization of flue gas is carried out through gas/liquid phase contact of flue gas with an absorbent slurry. More particularly, disclosed in a combined absorption tower comprising an absorbent sl... | 02/25/1997 |
| 5486341 | Entrainment separator for high velocity gases Sulfur oxides (SOx) are scrubbed from combustion effluents with aqueous limestone slurries with greater efficiency due to the use of an improved entrainment separator. In the preferred embodiment of a single-loop, counter-current limestone wet ... | 01/23/1996 |
| 5458744 | Process to produce hydrogen and/or hemihydrate calcium sulphate from calcium sulphite A process for producing hydrogen and/or hemihydrate calcium sulphate from calcium sulphite. Waste solid containing calcium sulphite and other calcium salts is treated by the addition of aqueous sulphur dioxide solution or sulphuric acid solution to produc... | 10/17/1995 |
| 5403568 | Horizontal wet scrubbing apparatus and method for removing sulfur dioxide from a gaseous stream A horizontal wet scrubbing apparatus and method for removing sulfur dioxide from hot flue gases. The apparatus has a horizontally disposed housing through which the hot flue gases are passed, and at least one liquid injection manifold vertically disposed ... | 04/04/1995 |
| 5366716 | Method for recovering sulphur dioxide from the chemical circulation of a sulphate pulp mill Sulphur dioxide is separated from the flue gases of a cellulose pulp mill by absorbing it into a sodium sulphite solution. Sulphur dioxide is regenerated from the sodium bisulphite solution produced by an evaporation-crystallization method utilizing therm... | 11/22/1994 |
| 5312609 | Method of sulfur dioxide removal from gaseous streams with -hemihydrate gypsum product formation A method is provided for removing sulfur dioxide from a hot gaseous stream while directly producing -hemihydrate gypsum from a scrubber effluent. A portion of an aqueous scrubbing medium containing calcium and magnesium sulfite is removed from a sc... | 05/17/1994 |
| 5310498 | Sulfur dioxide removal from gases using a modified lime A wet scrubbing process for removing sulfur dioxide from combustion gases uses an aqueous slurry containing calcium components resulting from the slaking of lime, with the slaked lime formed by mixing lime with water containing a calcium sulfur-oxide salt... | 05/10/1994 |
| 5270026 | Sulfur dioxide scrubbing process producing purified magnesium hydroxide A process for removing sulfur dioxide from flue gases where calcium sulfate and magnesium hydroxide are produced, with the magnesium hydroxide separated in an impure state and purified by addition of water thereto to dissolve contaminant calcium sulfate. ... | 12/14/1993 |
| 5266285 | Sodium-enhanced lime scrubbing method for removing sulfur dioxide from gaseous streams Sulfur dioxide is removed from a gaseous stream by contact with a lime slurry which contains sulfur to produce thiosulfate ions and 2,000-10,000 ppm of effective sodium ions to effect removal of the sulfur dioxide A bleed stream, removed from the scrubbin... | 11/30/1993 |
| 5266287 | Regenerable flue gas desulfurization system A regenerable flue gas desulfurization system whose end product is preferably a commercial quality gypsum (such as for use in wallboard or the like) or other product easily landfilled. Accordingly, sulfur containing flue gas is passed through an absorber ... | 11/30/1993 |
| 5260045 | Modification of magnesium-enhanced lime flue gas desulfurization process to improve solids dewatering An improved wet magnesium-enhanced lime flue gas desulfurization system and process are provided. The magnesium-enhanced lime slurry process for removing sulfur dioxide from flue gas to produce gas that is substantially free from sulfur dioxide and calciu... | 11/09/1993 |
| 5246679 | Addition of organophosphonates for size control of wet calcium-based FGD byproduct solids under inhibited oxidation conditions A process for producing large, regularly-shaped crystalline calcium sulfite solids in a wet calcium-based flue gas desulfurization system is provided. A chemical crystal modifier, preferably an organophosphonate, is added to the calcium sulfite-containing... | 09/21/1993 |
| 5246678 | High-performance flue-gas desulfurization process A desulfurization process which comprises the steps of bringing a combustion exhaust gas into contact with a gypsum slurry containing 1% or less of calcium carbonate in a first absorption tower, and then bringing the combustion exhaust gas into contact wi... | 09/21/1993 |
| 5246471 | Method and apparatus for gas liquid contact A gas-liquid contact system for absorption of gaseous contaminants in an absorptive liquid where contact is attained by a controlled flow relationship between the gas and the liquid forming a fluidized liquid mass for intimate contact between the two.... | 09/21/1993 |
| 5084255 | Sulfur dioxide removal process with gypsum and magnesium hydroxide production Sulfur dioxide is removed from flue gases using an aqueous solution of magnesium components in a wet scrubber, with oxidation of a portion of the aqueous discharge from the scrubber. Calcium sulfate is added to the portion of aqueous discharge at the oxid... | 01/28/1992 |
| 5082639 | Sulfur dioxide removal from gases using a modified lime A wet scrubbing process for removing sulfur dioxide from combustion gases uses an aqueous slurry containing calcium components resulting from the slaking of lime, with the slaked lime formed by mixing lime with water containing a calcium sulfur-oxide salt... | 01/21/1992 |
| 5077023 | Reduction in the rate of oxidation of sulfite solutions The rates of oxidation of sulfite/bisulfite-containing solutions in gas-liquid scrubbers for removing SO2 from gases are reduced by adding oxidation inhibitors to the solutions in an amount of from 0.02 to 20 mmol per hour and per square meter ... | 12/31/1991 |
| 5075085 | Desulfurizing method for exhaust gas from combustor A method and equipment for desulfurizing exhaust gas from a combustor in which the exhaust gas containing SO2 from the combustor is brought into contact with SO2 absorbent to remove SO2 and is blown down out of the system;... | 12/24/1991 |
| 5047218 | Sweetening of sulfur-containing gases using ozone A process which reduces the amount of sulfur compounds present in a feed gas is disclosed. A gas containing sulfur compounds is admixed with an ozone-containing gas. This admixture is then contacted with a scrubbing composition to obtain a gas and a produ... | 09/10/1991 |
| 5039499 | Process for desulfurization of sulfur dioxide-containing gas streams A process for desulfurizing sulfur dioxide-containing gases wherein the sulfur-containing gases are contacted with an aqueous solution of magnesium hydroxide in a wet scrubber, wherein magnesium sulfite and magnesium bisulfite are formed, a portion of spe... | 08/13/1991 |
| 4996032 | Process for removing sulfur dioxide from flue gases A process for removing sulfur dioxide from a flue gas in a wet scrubber with an aqueous slurry formed from calcium hydroxide and magnesium hydroxide with magnesium hydroxide or magnesium oxide recovered therefrom. A thickened sludge from a thickener conta... | 02/26/1991 |
| 4976937 | Sulfur dioxide removal from flue gases with sulfite oxidation inhibition A method for removing sulfur dioxide from flue gases in a wet scrubbing system where calcium thiosulfate and calcium polysulfides are formed by the reaction of lime and emulsified sulfur and the mixture added to a recycle tank of the wet scrubber where it... | 12/11/1990 |
