Patent US4704971A successfully refreshed from Google Patents.
US4704971A
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Pulverized-coal burner
Assignee: Brennstoffinstitut Freiberg
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Filing: 1986-12-05
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Granted: 1987-11-10
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Expires: 2006-12-05
Abstract
Abstract The invention relates to burners for the gasification of pulverized coal--injected in a dense phase--with steam and oxygen, and it can be employed for coal gasification in the chemical industry. Objects of the present invention are to increase the reliability in operation of the burner and to improve the quality of the gas obtained from the gasification process. The burner should be designed in such a way that a reliable operation is attained under the conditions of the gasification process (e. g. high pressures and temperatures within the gasifier). The design of the pulverized-coal feeding device, the water-cooled jacket and the swirl chamber according to the invention are described in detail.
Inventors
- 👤 Klaus Fleischer
- 👤 Peter Gohler
- 👤 Rolf Mangler
- 👤 Christian Reuther
- 👤 Manfred Schingnitz
- 👤 Friedrich Berger
- 👤 Ernest Gudymov
- 👤 Vladimir Semenov
- 👤 Vasilij Fedotov
- 👤 Boris Rodionov
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:28
CPC Classifications
C; C10; C10J; C10J3/00; C10J3/46; C10J3/48; C10J3/485; C10J3/487; C10J3/50; C10J3/506; C10J3/72; C10J3/74; C10J3/76; C10J2300/00; C10J2300/09; C10J2300/0953; C10J2300/0956; C10J2300/0959; C10J2300/0973; C10J2300/0976
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
322 words
A pulverized-coal burner comprising a housing (1) with an inlet pipe connection (2) for the supply of a mixture of steam and an oxidizing agent; a central tube (3) with a duct (4) for supplying a fuel gas, a duct (5) for supplying an oxidizing agent, and a combustion chamber (6) arranged at the lower end of said central tube with said duct opening into said combustion chamber; a pipe section (7) arranged between the housing (1) and the central tube (3) thereby forming annular chambers; a pulverized-coal feeding device provided in the annular chamber between the central tube (3) and said pipe section (7); a transverse partition provided between the central tube (3) and the pipe section (7) which forms a swirl chamber (14) opening at the bottom, into which the pulverized-coal feeding device extends; a bottom plate (8) closing the annular chamber between the pipe section (7) and the housing (1); a water-cooled jacket (10) enclosing the housing (1), the bottom plate (8) and the pipe section (7); and a great number of discharge nozzles (9) for the supply of a mixture of steam and an oxidizing agent, these nozzles being provided in said bottom plate (8), passing through the water-cooled jacket (10) and opening to the outside; and characterized in that an annular plate (18) is provided between the plate (8) and the water-cooled jacket (10), this plate having openings corresponding to the discharge nozzles (9), one edge of this annular plate (18) being fixed to the bottom plate (8) and the other edge, to the jacket (10); that the openings in said plate (18) are provided with sleeves (19) arranged coaxially with the corresponding discharge nozzles (9) in such a way that annular clearances are formed between said discharge nozzles (9) and said sleeves (19), said sleeves (19) extending into cup-shaped recesses (20) provided coaxially in the surface of the water-cooled jacket (10) thereby forming clearances as well.
Claim 2
Dependent Claim
322 words
A pulverized-coal burner comprising a housing (1) with an inlet pipe connection (2) for the supply of a mixture of steam and an oxidizing agent; a central tube (3) with a duct (4) for supplying a fuel gas, a duct (5) for supplying an oxidizing agent, and a combustion chamber (6) arranged at the lower end of said central tube with said duct opening into said combustion chamber; a pipe section (7) arranged between the housing (1) and the central tube (3) thereby forming annular chambers; a pulverized-coal feeding device provided in the annular chamber between the central tube (3) and said pipe section (7); a transverse partition provided between the central tube (3) and the pipe section (7) which forms a swirl chamber (14) opening at the bottom, into which the pulverized-coal feeding device extends; a bottom plate (8) closing the annular chamber between the pipe section (7) and the housing (1); a water-cooled jacket (10) enclosing the housing (1), the bottom plate (8) and the pipe section (7); and a great number of discharge nozzles (9) for the supply of a mixture of steam and an oxidizing agent, these nozzles being provided in said bottom plate (8), passing through the water-cooled jacket (10) and opening to the outside; and characterized in that an annular plate (18) is provided between the plate (8) and the water-cooled jacket (10), this plate having openings corresponding to the discharge nozzles (9), one edge of this annular plate (18) being fixed to the bottom plate (8) and the other edge, to the jacket (10); that the openings in said plate (18) are provided with sleeves (19) arranged coaxially with the corresponding discharge nozzles (9) in such a way that annular clearances are formed between said discharge nozzles (9) and said sleeves (19), said sleeves (19) extending into cup-shaped recesses (20) provided coaxially in the surface of the water-cooled jacket (10) thereby forming clearances as well.
Claim 3
Dependent Claim
32 words
A pulverized-coal burner according to claim 1, characterized in that the water-cooled jacket (10) has an external surface which is provided with a refractory layer at least in the bottom area (21).
Claim 4
Dependent Claim
64 words
A pulverized-coal burner according to claim 1, characterized in that the swirl chamber (14) is provided with a helical swirling device whose inlet (24) is connected to the pulverized-coal feeding device which is shaped like a tube (15) arranged helically around the central tube (3) and which changes into a duct having a rectangular cross section (17) and opening into the swirl chamber (14).
Claim 5
Dependent Claim
35 words
A pulverized-coal burner as defined in claim 3, characterized in that the helical swirling device consists of a cylindrical part (22) and an adjacent conical part (23), with an Archimedean spiral serving as a guide.
Claim 6
Dependent Claim
31 words
A pulverized-coal burner according to claim 2, characterized in that the thickness of the refractory layer (21) corresponds to the height of the cup-shaped recesses (20) in the water-cooled jacket (10).
Claim 7
Dependent Claim
268 words
A pulverized-coal burner comprising a housing (1) with an inlet pipe connection (2) for the supply of a mixture of steam and an oxidizing agent; a central tube (3) with a duct (4) for supplying a fuel gas, a duct (5) for supplying an oxidizing agent, and a combustion chamber 6 arranged at the lower end of said central tube with said duct opening into said combustion chamber; a pipe section (7) arranged between the housing (1) and the central tube (3) thereby forming annular chambers; a pulverized-coal feeding device provided in the annular chamber between the central tube 3 and said pipe section (7); a transverse partition provided between the central tube (3) and the pipe section (7) which forms a swirl chamber (14) opening at the bottom, into which the pulverized-coal feeding device extends; a bottom plate (8) closing the annular chamber between the pipe section (7) and the housing (1); a water-cooled jacket (10) enclosing the housing (1), the bottom plate (8) and the pipe section (7); and a great number of discharge nozzles (9) for the supply of a mixture of steam and an oxidizing agent, these nozzles being provided in said bottom plate (8), passing through the water-cooled jacket (10) and opening to the outside; and characterized in that the swirl chamber (14) is provided with a helical swirling device whose inlet (24) is connected with the pulverized-coal feeding device which is shaped like a tube (15) arranged helically around the central tube (3) and which changes into a duct having a rectangular cross section (17) and opening into the swirl chamber (14).
Claim 8
Dependent Claim
268 words
A pulverized-coal burner comprising a housing (1) with an inlet pipe connection (2) for the supply of a mixture of steam and an oxidizing agent; a central tube (3) with a duct (4) for supplying a fuel gas, a duct (5) for supplying an oxidizing agent, and a combustion chamber 6 arranged at the lower end of said central tube with said duct opening into said combustion chamber; a pipe section (7) arranged between the housing (1) and the central tube (3) thereby forming annular chambers; a pulverized-coal feeding device provided in the annular chamber between the central tube 3 and said pipe section (7); a transverse partition provided between the central tube (3) and the pipe section (7) which forms a swirl chamber (14) opening at the bottom, into which the pulverized-coal feeding device extends; a bottom plate (8) closing the annular chamber between the pipe section (7) and the housing (1); a water-cooled jacket (10) enclosing the housing (1), the bottom plate (8) and the pipe section (7); and a great number of discharge nozzles (9) for the supply of a mixture of steam and an oxidizing agent, these nozzles being provided in said bottom plate (8), passing through the water-cooled jacket (10) and opening to the outside; and characterized in that the swirl chamber (14) is provided with a helical swirling device whose inlet (24) is connected with the pulverized-coal feeding device which is shaped like a tube (15) arranged helically around the central tube (3) and which changes into a duct having a rectangular cross section (17) and opening into the swirl chamber (14).
Claim 9
Dependent Claim
34 words
A pulverized-coal burner according to claim 6, characterized in that the helical swirling device consists of a cylindrical part (22) and an adjacent conical part (23), with an Archimedean spiral serving as a guide.
References Cited (Backward Citations)
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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) | 1990-11-09 | 1991-05-11 | 1991-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-09 | 1995-05-11 | 1995-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-09 | 1999-05-11 | 1999-11-10 | $7700.00 | Window Closed / Lapsed |