US3818869A
Expired / Lapsed
US
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Method of operating a combined gasification-steam generating plant
Assignee: Combustion Engineering Inc
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Filing: 1973-01-02
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Granted: 1974-06-25
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Expires: 1993-01-02
Abstract
Abstract A steam generating plant is provided which includes an entrainment, slagging, air blown atmospheric pressure coal gasifier, a heat recovery train, atmospheric pressure desulfurization and a steam generator designed to burn the low Btu fuel gas produced in the gasifier. Heat recovered from the gas produced in the gasifier is used to raise the temperature of a portion of the steam generator feedwater, generate steam for use in the gasifier, and to reheat the fuel gas following desulfurization. Heat recovered from boiler flue gas is utilized in drying and preheating the reactants to the gasifier.
Inventors
- 👤 H Blaskowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:47
CPC Classifications
C; C10; C10J; C10J3/00; C10J3/72; C10J3/86; C10J3/46; C10J3/466; C10J3/48; C10J3/50; C10J3/506; C10J3/74; C10J3/82; C10J3/84; C10J3/845; C10J2300/00; C10J2300/09; C10J2300/0903; C10J2300/0906; C10J2300/0909; C10J2300/0913; C10J2300/093; C10J2300/0953; C10J2300/0956; C10J2300/0959; C10J2300/0973; C10J2300/0976; C10J2300/12; C10J2300/1253; C10J2300/18; C10J2300/1807; C10J2300/1861; C10J2300/1884; C10J2300/1892; Y; Y02; Y02P; Y02P20/00; Y02P20/10; Y02P20/129
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
123 words
A method of operating a steam generating plant in conjunction with a coal gasification plant which produces gaseous fuel to be burned in the steam generating plant, comprising the steps of: producing a low Btu gaseous fuel in said gasifier by the reaction at high temperatures of oxygen and steam with a solid carbonaceous fuel; flowing the gaseous fuel from the gasifier in heat exchange relation with a flow of water; passing said flow of water through the walls of said gasifier to effect the cooling thereof; burning said gaseous fuel in said steam generating plant to produce heat for the generation of steam therein; and conducting the hot water exiting from said gasifier walls to the boiler of said steam generating plant.
Claim 2
Independent Claim
123 words
A method of operating a steam generating plant in conjunction with a coal gasification plant which produces gaseous fuel to be burned in the steam generating plant, comprising the steps of: producing a low Btu gaseous fuel in said gasifier by the reaction at high temperatures of oxygen and steam with a solid carbonaceous fuel; flowing the gaseous fuel from the gasifier in heat exchange relation with a flow of water; passing said flow of water through the walls of said gasifier to effect the cooling thereof; burning said gaseous fuel in said steam generating plant to produce heat for the generation of steam therein; and conducting the hot water exiting from said gasifier walls to the boiler of said steam generating plant.
Claim 3
Independent Claim
130 words
A method of operating a steam generating plant in conjunction with a coal gasification plant which produces gaseous fuel to be burned in the steam generating plant, comprising the steps of: burning a first reactant stream of pulverized coal and preheated stoichiometric air in said gasifier to produce hot product of combustion gases; reacting a second reactant stream of pulverized coal and steam with said hot product of combustion gases in said gasifier to produce a low Btu gaseous fuel therein; flowing water through the walls of said gasifier to effect the cooling thereof; burning said gaseous fuel in said steam generating plant to produce heat for the generation of steam therein; and conducting the hot water exiting from said gasifier walls to the boiler of said steam generating plant.
Claim 4
Independent Claim
130 words
A method of operating a steam generating plant in conjunction with a coal gasification plant which produces gaseous fuel to be burned in the steam generating plant, comprising the steps of: burning a first reactant stream of pulverized coal and preheated stoichiometric air in said gasifier to produce hot product of combustion gases; reacting a second reactant stream of pulverized coal and steam with said hot product of combustion gases in said gasifier to produce a low Btu gaseous fuel therein; flowing water through the walls of said gasifier to effect the cooling thereof; burning said gaseous fuel in said steam generating plant to produce heat for the generation of steam therein; and conducting the hot water exiting from said gasifier walls to the boiler of said steam generating plant.
Claim 5
Dependent Claim
45 words
The method of claim 2 including the steps of flowing the hot gaseous fuel from the gasifier in heat exchange relation with process water to form steam; and mixing the steam formed in the preceedIng step with pulverized coal to form said second reactant stream.
Claim 6
Dependent Claim
70 words
The method of claim 2 including the steps of: flowing the hot flue gases from the steam generating plant in heat exchange relation with atmospheric air to raise the temperature of said air; mixing a first portion of said air with pulverized coal to dry the coal; and mixing a second portion of said air along with said previously mixed air and pulverized coal, to form said first reactant stream.
Claim 7
Dependent Claim
56 words
The method of claim 2 including the steps of: mixing a quantity of hot flue gases from the steam generating plant with pulverized coal to lower the moisture content of the coal; separating the dry pulverized coal from the hot flue gases; and; mixing the dry puvlerized coal with steam to form said second reactant stream.
Claim 8
Independent Claim
161 words
A method of operating a steam generating plant in conjunction with a coal gasification plant which produces gaseous fuel to be burned in the steam generating plant, comprising the steps of: producing a low Btu gaseous fuel in said gasifier by the reaction at high temperatures of oxygen and steam with a solid carbonaceous fuel; flowing water through the walls of said gasifier to effect the cooling thereof; cooling the gaseous fuel from the gasifier by passing it in heat exchange relation with the fluid in one half of a fluid coupled heat exchanger; removing the H2S from the gaseous fuel; reheating the cleaned gas by passing it in heat exchange relation with the fluid in the second half of said fluid coupled heat exchanger; burning said gaseous fuel in said steam generating plant to produce heat for the generation of steam therein; and conducting the hot water exiting from said gasifier walls to the boiler of said steam generating plant.
Claim 9
Independent Claim
161 words
A method of operating a steam generating plant in conjunction with a coal gasification plant which produces gaseous fuel to be burned in the steam generating plant, comprising the steps of: producing a low Btu gaseous fuel in said gasifier by the reaction at high temperatures of oxygen and steam with a solid carbonaceous fuel; flowing water through the walls of said gasifier to effect the cooling thereof; cooling the gaseous fuel from the gasifier by passing it in heat exchange relation with the fluid in one half of a fluid coupled heat exchanger; removing the H2S from the gaseous fuel; reheating the cleaned gas by passing it in heat exchange relation with the fluid in the second half of said fluid coupled heat exchanger; burning said gaseous fuel in said steam generating plant to produce heat for the generation of steam therein; and conducting the hot water exiting from said gasifier walls to the boiler of said steam generating plant.
Claim 10
Dependent Claim
58 words
The method of claim 1 wherein the step of producing a low Btu gaseous fuel comprises the steps of: burning a first reactant stream of pulverized coal and preheated stoichiometric air in said gasifier to produce hot product of combustion gases; and reacting a second stream of pulverized coal and steam with said hot product of combustion gases.
Claim 11
Dependent Claim
45 words
The method of claim 7 including the steps of: flowing the hot gaseous fuel from the gasifier in heat exchange relation with process water to form steam; and mixing the steam formed in the preceeding step with pulverized coal to form said second reactant stream.
Claim 12
Dependent Claim
119 words
The method of claim 8 including the steps of: flowing the hot flue gas from the steam generating plant in heat exchange relation with atmospheric air to raise the temperature of the air; mixing a first portion of said heated air with pulverized coal to dry the coal; mixing a second portion of said air along with said previously mixed air and pulverized coal, to form said first reactant stream; mixing a quantity of hot flue gases from the steam generating plant with pulverized coal to dry the coal; separating the dry pulverized coal from the hot flue gases; and using said dry pulverized coal as the coal which is mixed with steam to form said second reactant stream.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |