Ronald M Bell

US Patent:

49826727, Jan 8, 1991

Filed:

Feb 23, 1990

Appl. No.:

7/488376

Inventors:

Ronald D. Bell - Austin TX

Assignee:

Radian Corporation - Austin TX

International Classification:

F23G 706

US Classification:

110346

Abstract:

A process for low NOX incineration which involves incinerating hazardous waste to produce a gaseous stream, adding combustible material to produce a combustible gas stream having combustible material in excess of the oxygen in the combustible gas stream, incinerating the combustible gas stream in a reducing atmosphere to produce a heated oxygen-depleted gaseous stream, converting at least a portion of the heat in the oxygen depleted stream into steam, adding air to the oxygen depleted stream to produce a stoichiometric excess of oxygen in the resultant stream relative to combustible material present in the resultant stream, passing the resultant stream over an oxidizing catalyst to produce an oxidized gaseous stream, removing heat from the oxidized stream, and venting the resultant cooled stream. A system for carrying out the foregoing process is also provided.

US Patent:

50222260, Jun 11, 1991

Filed:

Mar 26, 1990

Appl. No.:

7/499165

Inventors:

Ronald D. Bell - Austin TX

Assignee:

Radian Corporation - Austin TX

International Classification:

F01N 318

US Classification:

60274

Abstract:

A process and system for low NO. sub. x cogeneration to produce electricity and useful heat. Fuel and oxygen are provided to an internal combustion engine connected to drive an electric generator, to thereby generate electricity. An exhaust stream is recovered from the engine at a temperature of about 500. degree. to 1000. degree. F. which includes from about 6 to 15 percent oxygen. Fuel is added to the exhaust stream to create a fuel-rich mixture, the quantity of fuel being sufficient to react with the oxygen and reduce the NO. sub. x in said exhaust stream. The fuel-enriched stream is provided to an afterburner, and the fuel, NO. sub. x and available oxygen are reacted to provide a heated oxygen-depleted stream. The oxygen-depleted stream is cooled in a heat exchanger. Conversion oxygen is admixed with the cooled stream which is then passed over a catalyst bed under overall reducing conditions.

US Patent:

51602547, Nov 3, 1992

Filed:

Oct 4, 1991

Appl. No.:

7/771660

Inventors:

Ronald D. Bell - Austin TX
William C. Gardiner - Austin TX
John R. Howell - Austin TX
Ronald D. Matthews - Austin TX
Steven P. Nichols - Austin TX

Assignee:

Radian Corporation and the Board of Regents - Austin TX
The University of Texas System - Austin TX

International Classification:

F23D 1416

US Classification:

431 7

Abstract:

Apparatus for controlled low NO. sub. x combustion. First and second combustion zones are provided, each filled with a porous high temperature resistant matrix, the void spaces of which provide sites at which substantially all of the combustion occurs. The second zone is downstream of the first zone. Means are provided for mixing fuel and a gaseous source of oxygen and providing the resultant combustible mixture to the input end of the first combustion zone to establish fuel-lean conditions therein; and means for feeding the combustion products from the first zone to the second zone and augmenting same with further oxygen and sufficient additional fuel to create fuel-rich burning conditions therein to complete the oxidation of the products from the first zone. Cooling means are preferably mounted in proximity to the input end of the first combustion zone, for maintaining the temperature of the said combustible mixture at the input end below ignition temperature, thereby limiting the flame produced by combustion in the porous matrix to the downstream side of the cooling means. The corresponding method is also disclosed and claimed.

US Patent:

51781018, Jan 12, 1993

Filed:

Mar 9, 1992

Appl. No.:

7/848120

Inventors:

Ronald D. Bell - Austin TX

Assignee:

Radian Corporation - Austin TX

International Classification:

B09B 300
F22B 100

US Classification:

122 4D

Abstract:

A method and corresponding system are provided for reducing quantities of oxides of nitrogen, including N. sub. 2 O, that are generated in a coal-fired fluidized bed boiler, the exhaust stream from the fluidized bed boiler being at a temperature of about 600. degree. -650. degree. F. and including from about 3 to 6% oxygen, from about 50 to 500 ppmv of NO. sub. x and from about 50 to 300 ppmv of N. sub. 2 O. Pursuant to the invention, the exhaust stream is flowed through a thermal reaction zone at which fuel and air are burned, to provide a modified heated stream which includes small quantities of combustibles and of oxygen. The modified heated stream is passed over a first catalyst bed under overall reducing conditions, the quantity of oxygen in the stream being in stoichiometric excess of the amount of NO. sub. 2 O and NO. sub. x, but less than the amount of said combustibles; whereby the N. sub.

US Patent:

51414325, Aug 25, 1992

Filed:

Mar 15, 1991

Appl. No.:

7/670286

Inventors:

Ronald D. Bell - Austin TX
William C. Gardiner - Austin TX
John R. Howell - Austin TX
Mark M. Koeroghlian - Austin TX
Ronald D. Matthews - Austin TX
Steven P. Nichols - Austin TX

Assignee:

Radian Corporation - Austin TX
The Board of Regents, The University of Texas System - Austin TX

International Classification:

F23D 340

US Classification:

431 7

Abstract:

Burner apparatus for use in controlled low NO. sub. x combustion. Mixing and flow-directing means receive and mix fuel and air provided thereto and form a flow of the resulting combustible mixture. A combustion zone defined by a porous high temperature-resistant matrix includes an input end for receiving the combustible flow. Cooling means are mounted in proximity to the input end of the combustion zone, for maintaining the temperature of the flowing combustible mixture proximate the input end below ignition temperature, thereby limiting the flame produced by combustion in the porous matrix to the downstream side of the cooling means. The method for controlled low NO. sub. x combustion is also disclosed and claimed.

US Patent:

52243346, Jul 6, 1993

Filed:

Jul 1, 1992

Appl. No.:

7/907122

Inventors:

Ronald D. Bell - Austin TX

Assignee:

Radian Corporation - Austin TX

International Classification:

F01N 318

US Classification:

60274

Abstract:

A process and system for low NO. sub. x cogeneration to produce electricity and useful heat. Fuel and oxygen are provided to an internal combustion engine connected to drive an electric generator, to thereby generate electricity. An exhaust stream is recovered from the engine at a temperature of about 500. degree. to 1000. degree. F. which includes from about 6 to 15 percent oxygen. Fuel is added to the exhaust stream to create a fuel-rich mixture, the quantity of fuel being sufficient to react with oxygen and reduce the NO. sub. x in said exhaust stream. The fuel-enriched stream is provided to an afterburner, and the fuel, NO. sub. x and available oxygen are reacted to provide a heated oxygen-depleted stream. The oxygen-depleted stream is cooled in a first heat exchanger. Conversion oxygen is admixed with the cooled stream which is then passed over a catalyst bed under overall reducing conditions.

US Patent:

50805770, Jan 14, 1992

Filed:

May 24, 1991

Appl. No.:

7/708090

Inventors:

Ronald D. Bell - Austin TX
William C. Gardiner - Austin TX
John R. Howell - Austin TX
Ronald D. Matthews - Austin TX
Steven P. Nichols - Austin TX

International Classification:

F23D 340

US Classification:

431 7

Abstract:

Low NO. sub. x combustion is effected by a method wherein a fuel, e. g. , natural gas, and a source of oxygen, e. g. , air, are mixed and the mixture is combusted in at least two successive combustion zones filled with a porous matrix, the void spaces of which provide sites at which substantially all of the said combustion occurs; viz. a first zone wherein the mixture is fuel-rich, and a second zone wherein the mixture is fuel-lean. Preferably, the method utilizes an additional combustion zone which precedes or is upstream of the first zone and is filled with a said porous matrix, wherein the mixture is fuel-lean. Apparatus for low NO. sub. x combustion is also provided which includes an arrangement for mixing fuel and oxygen, and at least first and second combustion zones filled with a said porous matrix, and means for providing a fuel-oxygen mixture to said first zone which is fuel rich, and for adjusting the resulting combustion products flowed to the second zone with additional fuel and oxygen as to provide a fuel-lean mixture therein. Preferably the apparatus also includes a zone or stage filled with a said porous matrix which precedes or is upstream of the first zone, to which the fuel and oxygen are initially provided as to establish fuel-lean conditions therein.

US Patent:

49360884, Jun 26, 1990

Filed:

Oct 3, 1988

Appl. No.:

7/252778

Inventors:

Ronald D. Bell - Austin TX

Assignee:

Radian Corporation - Austin TX

International Classification:

F02C 334

US Classification:

60 3906

Abstract:

A process for low NOX cogeneration to produce electricity and heat which involves combusting fuel to produce a gaseous stream of combustion products, passing the gaseous stream through a turbine to generate electricity, and to produce a gaseous exhaust stream, adding additional fuel to the exhaust stream, to provide a fuel-rich gas stream having fuel in excess of the oxygen in the combustible gas stream, treating the fuel-rich gas stream in a reducing atmosphere to produce a heated oxygen-depleted gaseous stream, converting at least a portion of the heat in the oxygen depleted stream into steam, adding air to the oxygen-depleted stream to produce a stoichiometric excess of oxygen in the resultant stream relative to fuel present in the resultant stream, passing the resultant stream over an oxidizing catalyst to produce an oxidized gaseous stream, removing heat from the oxidized stream, and venting the resultant cooled stream, the process further providing for cycling to the combusting step at least some of the oxidized gaseous stream. An apparatus system for carrying out this process is also provided.