David J Hand

US Patent:

43959563, Aug 2, 1983

Filed:

Feb 22, 1982

Appl. No.:

6/351267

Inventors:

Calvin H. Hand - Tappahannock VA
David J. Hand - Warsaw VA
John A. Careatti - Howertons VA

International Classification:

F23B 500
F23K 300

US Classification:

110235

Abstract:

A bio-mass burner having a continuous feed on demand to a first combustion chamber that contains a hollow grate structure. The novel method of operation includes the use of at least one venturi tube which is in fluid communication with the hollow grate structure to establish an air flow into a second combustion chamber. Primary air to support combustion in the first chamber is supplied to the underside of the grate structure. Secondary air to support combustion in the second chamber is supplied through the hollow grate structure and then to the venturi tube in a sufficiently tortuous path through the first combustion chamber to insure that the air is superheated at the outlet of the venturi tube. A baffle arrangement in the first combustion chamber directs the fuel product toward the grate structure and assists in preventing any unburned gases from being ejected into the atmosphere.

US Patent:

51780763, Jan 12, 1993

Filed:

Sep 6, 1991

Appl. No.:

7/755735

Inventors:

David J. Hand - Warsaw VA
Calvin H. Hand - Denver CO
Stan E. Abrams - Castle Rock CO

International Classification:

F23B 500

US Classification:

110210

Abstract:

A bio-mass burner construction for alternate fuels at temperatures from about 1,800 degrees F. to about 2,800 degrees F. to replace oil and gas burners. The burner utilizes a first burning chamber having a falling fuel, entrained bed zone positioned above a traveling grate having a porous metallic woven belt. Primary air is directed through the porous belt to establish an oxygen-starved first burning chamber. A second burning chamber in fluid communication with the first burning chamber, but having a restricted diameter, effectively provides a hot air gas nozzle. The second burning chamber receives a superheated secondary air source from cored apertures in interfitting refractory block members which provide a refractory lining for a portion of the first burning chamber and receive heat from the first burning chamber to heat the secondary air. In larger sized units a plurality of conveyors constitute the traveling grate with the conveyors being arranged in head-to-head stepped relationship so that unburned fuel received by gravity from the entrained bed zone is agitated or jostled to enhance its burning. An automatic ash removal system receives ashes from the traveling grate in a U-shaped trough through which travels a heavy duty auger.

US Patent:

43411991, Jul 27, 1982

Filed:

Jun 13, 1980

Appl. No.:

6/159226

Inventors:

Calvin H. Hand - Tappahannock VA
David J. Hand - Warsaw VA
John A. Careatti - Howertons VA

International Classification:

F23H 102
F23H 300

US Classification:

126163A

Abstract:

A bio-mass burner having a continuous feed on demand to a first combustion chamber that contains a hollow grate structure. The novel method of operation includes the use of at least one venturi tube which is in fluid communication with the hollow grate structure to establish an air flow into a second combustion chamber. Primary air to support combustion in the first chamber is supplied to the underside of the grate structure. Secondary air to support combustion in the second chamber is supplied through the hollow grate structure and then to the venturi tube in a sufficiently tortuous path through the first combustion chamber to insure that the air is superheated at the outlet of the venturi tube. A baffle arrangement in the first combustion chamber directs the fuel product toward the grate structure and assists in preventing any unburned gases from being ejected into the atmosphere.

US Patent:

44754710, Oct 9, 1984

Filed:

May 31, 1983

Appl. No.:

6/499488

Inventors:

Calvin H. Hand - Tappahannock VA
David J. Hand - Warsaw VA
John A. Careatti - Howertons VA

International Classification:

F23B 500
F23K 300

US Classification:

110345

Abstract:

A bio-mass burner having a continuous feed on demand to a first combustion chamber that contains a hollow grate structure. The novel method of operation includes the use of at least one venturi tube which is in fluid communication with the hollow grate structure to establish an air flow into a second combustion chamber. Primary air to support combustion in the first chamber is supplied to the underside of the grate structure. Secondary air to support combustion in the second chamber is supplied through the hollow grate structure and then to the venturi tube in a sufficiently tortuous path through the first combustion chamber to insure that the air is superheated at the outlet of the venturi tube. A baffle arrangement in the first combustion chamber directs the fuel product toward the grate structure and assists in preventing any unburned gases from being ejected into the atmosphere.

US Patent:

52841030, Feb 8, 1994

Filed:

Dec 4, 1992

Appl. No.:

7/985707

Inventors:

David J. Hand - Warsaw VA
Calvin H. Hand - Denver CO
Stan E. Abrams - Castle Rock CO

Assignee:

Waste Conversion Systems, Inc. - Englewood CO

International Classification:

F23G 500
F23D 102

US Classification:

110255

Abstract:

A bio-mass burner construction for alternate fuels at temperatures from about 1,800 degrees F. to about 2,800 degrees F. to replace oil and gas burners. The burner utilizes a first burning chamber having a falling fuel, entrained bed zone positioned above a traveling grate having a porous metallic woven belt. Primary air is directed through the porous belt to establish an oxygen-starved first burning chamber. A second burning chamber in fluid communication with the first burning chamber, but having a restricted diameter, effectively provides a hot air gas nozzle. The second burning chamber receives a superheated secondary air source from cored apertures in interfitting refractory block members which provide a refractory lining for a portion of the first burning chamber and receive heat from the first burning chamber to heat the secondary air. In larger sized units a plurality of conveyors constitute the traveling grate with the conveyors being arranged in head-to-head stepped relationship so that unburned fuel received by gravity from the entrained bed zone is agitated or jostled to enhance its burning. An automatic ash removal system receives ashes from the traveling grate in a U-shaped trough through which travels a heavy duty auger.