Gregory M Gitman

US Patent:

50429647, Aug 27, 1991

Filed:

Jan 2, 1990

Appl. No.:

7/464613

Inventors:

Gregory M. Gitman - Duluth GA

Assignee:

American Combustion, Inc. - Norcross GA

International Classification:

F27B 1400

US Classification:

432 13

Abstract:

A method and corresponding apparatus for improving the control and efficiency of a combustion reaction in a flash smelting furnace, having the steps of mixing a first oxidizing gas having a first oxygen concentration with solid particles consisting of at least one combustible component and at least one incombustible component, directing the mixture of solid particles and said first oxidizing gas into a combustion chamber of the flash smelting furnace, burning the mixture of solid particles and oxidizing gas in a first flame portion to provide for the smelting of the solid particles, directing an auxiliary fuel into the combustion chamber to surround said first flame portion, directing a second oxidizing gas having a second oxygen concentration into the combustion chamber to surround the first flame portion and mix with the auxiliary fuel, burning the auxiliary fuel and the second oxidizing gas to create a second flame portion surrounding the first flame portion, controlling the flow of the first and second oxidizing gases and the auxiliary fuel to provide a temperature gradient between the first flame portion and the second flame portion for maintaining a desired temperature of the particles leaving the flame envelope during the first stage of smelting, accumulating treated material downstream of said flame envelope, and further directing a stream of additional oxidizing gas to oxidize at least a fraction of combustible components left inside the accumulated material.

US Patent:

57889210, Aug 4, 1998

Filed:

Oct 29, 1996

Appl. No.:

8/739718

Inventors:

Gregory M. Gitman - Atlanta GA
Grigori Galperine - Novokuznetsk, RU
Stanislav I. Zhigach - St. Petersburg, RU

Assignee:

American Combustion, Inc. - Norcross GA

International Classification:

C22B 916

US Classification:

266225

Abstract:

A burner/injector for providing a localized impingement flame or multiple flames for scrap heating and melting through use of a fluid fuel and at least one oxygen rich oxidizing gas. The burner/injector includes a liquid-cooled combustor for generating an impinging flame directed toward a scrap pile and a structure for injecting a controllable amount of a solid carbonaceous fuel and a controllable flow of high velocity oxidizing gas into space that has been previously occupied by the impinging flame. The burner/injector may be equipped to inject a solid slag forming materials and/or slag deoxidizing materials, and/or to inject an additional oxidizing gas for burning a small portion of preheated scrap, post-combustion of CO and iron-carbon melt refining. The burner/injector may be arranged as a simple liquid-cooled combustor permanently mounted through the furnace wall or roof, and may be equipped with single or multiple channels for injection of solid material and high velocity oxidizing gas. Separate injecting lances for high velocity oxidizing gas and/or solid carbonaceous fuel may be mounted on the furnace.

US Patent:

54177405, May 23, 1995

Filed:

Jun 22, 1994

Appl. No.:

8/263518

Inventors:

Grigori Galperin - Novokuznetsk, RU
Anatoli Boutchenkov - Novokuznetsk, RU
Gregory M. Gitman - Atlanta GA
Rafik Aizatulov - Novokuznetsk, RU

Assignee:

ZapTech Corporation - Norcross GA

International Classification:

C21C 532

US Classification:

75528

Abstract:

A method of steelmaking in an at least partially refractory lined furnace. The process includes the steps of retaining a portion of a hot liquid slag from a previous heat, and altering the retained slag with basic slag forming material to increase its basicity, melting temperature, and viscosity, and to reduce its melting temperature below the melting point. The altering step is performed before charging ferrous materials for a new heat. Altered slag is then positioned on the bottom of the furnace, or on the furnace walls, or both, using a slag coating technique. Ferrous metal is then charged, after which a second charge of basic slag forming materials may be added prior to and/or during the first controllable oxygen blow. A slagging off step is conducted after less than one-half of the oxygen is introduced into the heat and when the mass of oxygen already introduced is sufficient to oxidize approximately all of the silicon introduced with hot liquid metal charged into the furnace.

US Patent:

59548550, Sep 21, 1999

Filed:

Apr 22, 1997

Appl. No.:

8/837678

Inventors:

Gregory M. Gitman - Atlanta GA
Grigori Galperine - Novokuznetsk, RU
Stanislav I. Zhigach - St. Petersburg, RU

Assignee:

American Combustion, Inc. - Norcross GA

International Classification:

C21B 1312

US Classification:

75 1042

Abstract:

A method of melting and refining metals by high-temperature impinging combustion products generated by a single or multiple oxy-fuel or fuel/oxygen/air combustors that direct a flame towards a predetermined area of scrap to be melted. Once a portion of charged scrap contacted by the flame or flames is melted, an injection of solid carbonaceous fuel is initiated, preferably through a combustion tunnel of at least one of the combustors. High velocity oxygen is directed, simultaneously with carbonaceous material, through at least one dedicated nozzle toward injected solid carbonaceous fuel to mix with this fuel and to generate CO, which is capable of forming foamy slag. Optionally, a supersonic stream of multiple streams of additional oxygen is directed toward the iron--carbon melt to initiate rapid melt refining.

US Patent:

52862771, Feb 15, 1994

Filed:

May 26, 1992

Appl. No.:

7/889018

Inventors:

Rafik Aizatulov - Novokuznetsk, SU
Grigori Galperine - Novokuznetsk, SU
Gregory Gitman - Atlanta GA
Jakov Grenader - Moscow, SU
Boris Kustov - Novokuznetsk, SU

Assignee:

Zaptech Corporation - Norcross GA

International Classification:

C21C 532

US Classification:

75523

Abstract:

A steelmaking process is disclosed utilizes solid ferrous metallic material as a substantial part of the metallic charge and uses heat released by combustion of two different types of carbonaceous materials and steel scrap that have been strategically charged inside of at least a partially refractory lined steelmaking vessel. One of the carbonaceous materials contains a high content of volatile hydrocarbons and is primarily responsible for early preheating and partial melting of the solid ferrous material. The second carbonaceous material contains a low content of volatile hydrocarbons and is primarily responsible for providing a reducing capability to the slag, for carburizing the melt and for providing additional heat generated by combustion which is used to enhance heating and melting of solid ferrous materials. This method of steelmaking also consists of the controllable introduction of oxygen rich oxidizing gas which initially is used for combustion of said hydrocarbons in the carbonaceous materials to melt solid ferrous metallic material and further is used for refining the resultant molten pool of ferrous material before tapping. Slag forming material is used at the bottom of the furnace to provide for continuous refining of molten ferrous material throughout entire steelmaking process.

US Patent:

RE342980, Jun 29, 1993

Filed:

Aug 28, 1991

Appl. No.:

7/751864

Inventors:

Gregory M. Gitman - Duluth GA
Boris M. Khudenko - Atlanta GA

Assignee:

American Combustion, Inc. - Norcross GA

International Classification:

F23D 1400

US Classification:

431 5

Abstract:

The invention relates to an afterburner apparatus and an incineration system and methods of waste destruction in primary incineration combustion means and afterburner means which both preferably utilize at least two different oxidizing gases. By varying the ratio of said oxidizing gases, the amount of total oxygen and nitrogen delivered in either means can be dynamically adjusted in accordance with the process requirements. Varying the flows of at least two oxydizing gases and auxiliary fuel in both the primary incinerator and afterburner makes it possible to operate the system under fluctuating waste loading conditions, by controlling temperature, partial pressure of oxygen and heat available for the process as a function of said ratio.

US Patent:

50627899, Nov 5, 1991

Filed:

Aug 27, 1990

Appl. No.:

7/574500

Inventors:

Gregory M. Gitman - Duluth GA

International Classification:

F23D 2100

US Classification:

431 9

Abstract:

Furnace gas is aspirated through furnace gas conduits (44) to the low pressure throats (42) of the Venturi conduits (41) that move high oxygen content gas to the combustion chamber (28) of the aspirating burner (20). Fuel is injected through fuel conduit (46) to the combustion chamber (28) to mix with the gases and form the flame in the combustion chamber which is emitted at high velocity from the burner into the furnace.

US Patent:

58583025, Jan 12, 1999

Filed:

Nov 6, 1996

Appl. No.:

8/746206

Inventors:

Gregory M. Gitman - Atlanta GA
Grigori Galperine - Novokuznetsk, RU
Stanislav I. Zhigach - St. Petersburg, RU

Assignee:

American Combustion, Inc. - Norcross GA

International Classification:

C21B 1312

US Classification:

266182

Abstract:

A burner/injector for providing a localized impingement flame or multiple flames for scrap heating and melting through use of a fluid fuel and at least one oxygen rich oxidizing gas. The burner/injector includes a liquid-cooled combustor for generating an impinging flame directed toward a scrap pile and a structure for injecting a controllable amount of a solid carbonaceous fuel and a controllable flow of high velocity oxidizing gas into space that has been previously occupied by the impinging flame. The burner/injector may be equipped to inject a solid slag forming materials and/or slag deoxidizing materials and/or to inject an additional oxidizing gas for burning a small portion of preheated scrap, post-combustion of CO and iron-carbon melt refining. The burner/injector may be arranged as a simple liquid-cooled combustor permanently mounted through the furnace wall or roof, and may be equipped with single or multiple channels for injection of solid material and high velocity oxidizing gas. Separate injecting lances for high velocity oxidizing gas and/or solid carbonaceous fuel may be mounted on the furnace.