Patents Assigned to Wilhelm Environmental Technologies
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Patent number: 6045770Abstract: A flue gas conditioning system (FGC) for conditioning the flue gas flowing in a flue from a boiler to an electrostatic precipitator by injecting sulfur trioxide into the flue gas upstream of the electrostatic precipitator. The FGC has a source (52) of granulated sulfur which is transported by a conveyor (54) to a sulfur furnace (60) where it is combusted in sulfur dioxide. The sulfur dioxide flows from the sulfur furnace (60) into a catalytic converter 62 which generates sulfur trioxide therefrom. The sulfur trioxide flows from the catalytic converter 62 into probes 64 which are mounted in the flue duct. Alternatively, the FGC has a source (70) of emulsoid sulfur which is pumped by a sulfur pump (72) to the inlet of an atomizing spray nozzle (200) which atomizes the emulsoid sulfur and sprays it into sulfur furnace (50).Type: GrantFiled: June 3, 1997Date of Patent: April 4, 2000Assignee: Wilhelm Environmental TechnologiesInventors: Richard L. Batttles, Kent S. Duncan, deceased, David L. Woracek, Michael J. Lentz
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Patent number: 5681375Abstract: Disclosed is an improved system for treating boiler flue gas to improve the removal of particulate matter contained therein by electrostatic precipitation.Type: GrantFiled: July 16, 1996Date of Patent: October 28, 1997Assignee: Wilhelm Environmental Technologies, Inc.Inventors: Judson H. West, II, Robert A. Wright
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Patent number: 5665142Abstract: A flue gas conditioning system and method generates and introduces sulfur trioxide into flue gas produced by a boiler to condition the flue gas before it passes through an electrostatic precipitator. Flue gas is withdrawn from the flue duct which couples the boiler to the electrostatic precipitator and cleaned to provide a source of sulfur dioxide. The withdrawn flue gas is passed through a heater and then into a catalytic converter which converts native SO.sub.2 in the flue gas into SO.sub.3 which is then introduced back into the flue duct to condition the flue gas. The SO.sub.Type: GrantFiled: November 19, 1996Date of Patent: September 9, 1997Assignee: Wilhelm Environmental Technologies, Inc.Inventor: Robert A. Wright
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Patent number: 5547495Abstract: The present invention provides a flue gas conditioning system and method for generating conditioning agent used in the removal of entrained particles in a flue gas flow with an electrostatic precipitator. The invention involves a catalytic converter that is operable between an operative position where the flue gas is exposed to the catalyst and converts SO.sub.2 contained in the flue gas to SO.sub.3 when conditioning agent is needed and an inoperative position where the flue gas is not exposed to the catalyst when conditioning agent is no longer needed. The catalytic converter and related assembly may take variable configurations to accommodate various flue gas ductworks and space limitations and may carry one or more SO.sub.2 /SO.sub.3 converters providing a plurality of open and generally parallel flow paths of the flue gas.Type: GrantFiled: May 13, 1994Date of Patent: August 20, 1996Assignee: Wilhelm Environmental Technologies, Inc.Inventor: Robert A. Wright
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Patent number: 5449390Abstract: A flue gas conditioning system uses the waste heat of the flue gas to heat a sulfuric acid solution to add sufficient heat energy to the solution to vaporize the solution before being injected into the flue gas to condition the flue gas so that particulate removal by a precipitator is enhanced.Type: GrantFiled: March 8, 1994Date of Patent: September 12, 1995Assignee: Wilhelm Environmental Technologies, Inc.Inventors: Kent S. Duncan, Robert A. Wright
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Patent number: 5356597Abstract: The present invention provides a flue gas conditioning system and method for generating conditioning agent used in the removal of entrained particles in a flue gas flow with an electrostatic precipitator. The invention involves the use of a catalytic converter movable between an operative position where the flue gas flows through the catalyst and converts SO.sub.2 contained in the flue gas to SO.sub.3 when conditioning agent is needed and an inoperative position where the flue gas does not flow through the catalyst when conditioning agent is no longer needed. The movable catalytic converter and related assembly may take variable configurations to accommodate various flue gas ductworks and space limitations and may carry one or more SO.sub.2 /SO.sub.3 converters providing a plurality of open and generally parallel flow paths of the flue gas that are formed by a catalyst effective over a wide range of temperatures for the controlled conversion of preferably a low percentage of SO.sub.2 in the flue gas to SO.Type: GrantFiled: July 30, 1992Date of Patent: October 18, 1994Assignee: Wilhelm Environmental Technologies, Inc.Inventors: Robert A. Wright, George R. Dennis
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Patent number: 5350441Abstract: Improved apparatus and methods for the treatment of boiler flue gas with sulfur trioxide conditioning agent include the beneficial use of catalytic converters that can be located immediately adjacent the injection site for their sulfur trioxide output, that can be individually sized and manufactured for variable required conditioning agent outputs, that can be individually controlled and can provide substantially improved conversion efficiency and that can provide an efficient, flexible, effective and relatively inexpensive multi-boiler flue conditioning system.Type: GrantFiled: March 22, 1993Date of Patent: September 27, 1994Assignee: Wilhelm Environmental Technologies, Inc.Inventor: Robert A. Wright
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Patent number: 5288309Abstract: The present invention relates to a flue gas conditioning agent demand control apparatus for controlling a flow of conditioning agent for removal of entrained particles in a flue gas with an electrostatic precipitator having at least one charging electrode and at least one collecting electrode through the use of a signal determined from a rate of discharge of a charged electrode of the electrostatic precipitator.Type: GrantFiled: May 14, 1992Date of Patent: February 22, 1994Assignee: Wilhelm Environmental Technologies, Inc.Inventor: Robert A. Wright
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Patent number: 5288303Abstract: A flue gas conditioning system features a self-contained sulfur burner control loop that operates to maintain a constant desired temperature supply of sulfur dioxide in air by varying the rate of supply of sulfur fuel to the sulfur burner, and the absence of device in the sulfur flow path to measure or monitor sulfur flow rate. In the system, a conditioning agent demand signal operates either a means to supply the sulfur burner with a flow of air, or an air heater in the air flow path upstream of the sulfur burner, or both, to provide conditions that would increase or decrease the temperature of the sulfur burner output absent the self-contained sulfur burner control loop, and as a result of the operation of the self-contained sulfur burner control loop, systems of the invention can provide a demanded flow of sulfur dioxide and air at a substantially constant concentration and a desired temperature to a catalytic converter in response to a conditioning agent demand signal.Type: GrantFiled: April 7, 1992Date of Patent: February 22, 1994Assignee: Wilhelm Environmental Technologies, Inc.Inventors: David L. Woracek, Robert A. Wright
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Patent number: 5261931Abstract: SO.sub.3 flue gas-condition systems (10) provide a controlled flow of flue gas-conditioning agent such as SO.sub.3 into a boiler flue gas and its entrained particulate material ahead of an electrostatic precipitator (14). The systems (10) monitor the opacity of the stack effluent and precipitator power and operate to maintain a flow of SO.sub.3 -conditioning agent into the boiler flue gas to provide minimal opacity of the stack effluent. The systems operate at SO.sub.3 -conditioning agent flow rate corresponding to minimal opacity of the stack effluent and to eliminate corrections that may be due to transient operating conditions such as boiler upsets, precipitator rapping and the like. The systems include features providing improved conversion of SO.sub.2 into SO.sub.3, integrated assemblies to provide a flow of SO.sub.2 and sulfur dioxide conversion units adapted to convert SO.sub.2 into SO.sub.3 at a plurality of remote SO.sub.3 injection sites.Type: GrantFiled: September 14, 1992Date of Patent: November 16, 1993Assignee: Wilhelm Environmental Technologies, Inc.Inventor: Robert A. Wright
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Patent number: 5240470Abstract: The present invention provides a flue gas conditioning system and method for generating conditioning agent used in the removal of entrained particles in a flue gas flow with an electrostatic precipitator. The invention involves the use of a catalytic converter movable between an operative position where the flue gas flows through the catalyst and converts SO.sub.2 contained in the flue gas to SO.sub.3 when conditioning agent is needed and an inoperative position where the flue gas does not flow through the catalyst when conditioning agent is no longer needed. The movable catalytic converter and related assembly may take variable configurations to accommodate various flue gas ductworks and space limitations.Type: GrantFiled: July 1, 1992Date of Patent: August 31, 1993Assignee: Wilhelm Environmental Technologies, Inc.Inventor: Robert A. Wright
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Patent number: 5032154Abstract: SO.sub.3 flue gas-condition systems provide a controlled flow of flue gas-conditioning agent such as SO.sub.3 into a boiler flue gas and its entrained particulate material ahead of an electrostatic precipitator. The systems monitor the opacity of the stack effluent and operate to maintain a flow of SO.sub.3 -conditioning agent into the boiler flue gas to provide minimal opacity of the stack effluent. The systems operate to hunt and operate at SO.sub.3 -conditioning agent flow rate corresponding to minimal opacity of the stack effluent and to eliminate corrections that may be due to transient operating conditions such as boiler upsets, precipitator rapping and the like. The systems include features providing improved conversion of SO.sub.2 l into SO.sub.3, integrated assemblies to provide SO.sub.2 from sulfur and sulfur dioxide conversion units adapted to convert SO.sub.2 into SO.sub.3 at a plurality of remote SO.sub.3 injection sites.Type: GrantFiled: March 15, 1990Date of Patent: July 16, 1991Assignee: Wilhelm Environmental Technologies, Inc.Inventor: Robert A. Wright