Patent US5121700A successfully refreshed from Google Patents.
US5121700A
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US
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Method and apparatus for improving fluid flow and gas mixing in boilers
Assignee: Boiler Island Air Systems Inc
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Filing: 1990-09-24
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Granted: 1992-06-16
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Expires: 2010-09-24
Abstract
Abstract This invention is directed to a method and apparatus for improving fluid flow and gas mixing in boilers. More particularly, this invention pertains to a method and apparatus for improved fluid flow and gas mixing in kraft recovery boilers for increased energy efficiency, reduced TRS emissions and increased capacity. The method of introducing air into a boiler furnace comprises: (a) introducing air through at least one opening located on at least a first wall of the interior of the furnace; and (b) introducing air through at least one second opening located on a second wall of the interior of the furnace opposed to the first wall at the same, or different, elevations. The method of introducing air into a boiler furnace may also comprise: (a) introducing air into the furnace in the form of a first set of small and large jets originating from one wall of the interior of the furnace; and (b) introducing air into the furnace in the form of a second set of small and large jets originating from the wall of the interior of the furnace opposite the first wall. The locations of the sources of the first set of small and large jets may be placed so that they oppose the sources of the second set of small and large jets, with small jets opposing large jets, and vice versa. The sizes of the jets may be regulated by varying opening size, number of openings in groups of openings, air pressure upstream of the openings, or combinations thereof.
Inventors
- 👤 Brian R. Blackwell
- 👤 Colin MacCallum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:02
CPC Classifications
F; F23; F23G; F23G7/00; F23G7/04; F23C; F23C5/00; F23C5/08; F23C5/28; F23C7/00; F23C7/02; F23L; F23L1/00; F23L9/00; F23L9/06; F23C2201/00; F23C2201/10; F23C2201/101; F23G2207/00; F23G2207/30; F23G2209/00; F23G2209/10; F23G2209/101
Claims Analysis
Total Claims: 41
Claim 1
Independent Claim
114 words
A method for introducing primary air at the lowest airflow elevation into a boiler furnace having four walls, said method comprising: (a) introducing air through at least one first jet located at a given elevation on a first wall of the interior of the boiler furnace; (b) introducing air substantially at said given elevation through at least one second jet located on a second wall of the interior of the boiler furnace opposed to the first wall; (c) introducing substantially no air at substantially said given elevation through the remaining walls; wherein (d) said first and second jets are arranged in opposed pairs with each pair including a large jet and a small jet.
Claim 2
Independent Claim
114 words
A method for introducing primary air at the lowest airflow elevation into a boiler furnace having four walls, said method comprising: (a) introducing air through at least one first jet located at a given elevation on a first wall of the interior of the boiler furnace; (b) introducing air substantially at said given elevation through at least one second jet located on a second wall of the interior of the boiler furnace opposed to the first wall; (c) introducing substantially no air at substantially said given elevation through the remaining walls; wherein (d) said first and second jets are arranged in opposed pairs with each pair including a large jet and a small jet.
Claim 3
Dependent Claim
31 words
The method according to claim 1 wherein said first jets comprise a single large port and said second jets comprise a single small port that is opposed to said large port.
Claim 4
Dependent Claim
40 words
The method according to claim 1 wherein said first and second jets comprise single similarly sized ports and high pressure air is introduced into one of said ports and low pressure air is introduced into the other of said ports.
Claim 5
Dependent Claim
25 words
A method according to claim 1 wherein a large jet opposes a small jet and a small jet opposes a large jet in each pair.
Claim 6
Dependent Claim
65 words
The method according to claim 1 wherein: (a) said first jets comprise a first set of small and large ports; (b) said second jets comprise a second set of small and large ports; and (c) the positions of the ports in said first and second sets are arranged so that each small port opposes a large port and each large port opposes a small port.
Claim 7
Dependent Claim
20 words
The method according to claim 5 wherein the small and large ports in said first set alternate with one another.
Claim 8
Dependent Claim
20 words
The method according to claim 6 wherein the small and large ports in said second set alternate with one another.
Claim 9
Dependent Claim
49 words
The method according to claim 1 wherein said first and second jets comprise opposed sets of similarly sized ports and high pressure air is introduced into one port in each pair of ports in said sets and low pressure air is introduced into the opposed port in such pair.
Claim 10
Dependent Claim
30 words
The method according to claim 8 wherein each set has ports having high pressure air introduced therein alternating with ports in the same set having low pressure air introduced therein.
Claim 11
Dependent Claim
43 words
The method according to claim 5 or 8 wherein the ports in said first set are pointed downwardly, horizontally, or slightly upwardly, and the ports in said second set are pointed downwardly, horizontally, or slightly upwardly into the interior of the boiler furnace.
Claim 12
Dependent Claim
34 words
The method according to claim 1 wherein third and fourth pairs of opposed small and large jets are located at substantially common elevations in the boiler furnace higher than said first and second jets.
Claim 13
Dependent Claim
31 words
The method according to claim 11 wherein said third jets comprise a single large port and said fourth jets comprise a single small port that is opposed to said large port.
Claim 14
Dependent Claim
40 words
The method according to claim 11 wherein said third and fourth jets comprise single similarly sized ports and high pressure air is introduced into one of said ports and low pressure air is introduced into the other of said ports.
Claim 15
Dependent Claim
49 words
The method according to claim 11 wherein the third and fourth jets comprise opposed sets of similarly sized ports and high pressure air is introduced into one port in each pair of ports in said sets and low pressure air is introduced into the opposed port in such pair.
Claim 16
Dependent Claim
30 words
The method according to claim 14 wherein each set has ports having high pressure air introduced therein alternating with ports in the same set having low pressure air introduced therein.
Claim 17
Dependent Claim
65 words
The method according to claim 11 wherein: (a) said third jets comprise a third set of small and large ports; (b) said fourth jets comprise a fourth set of small and large ports; and (c) the positions of the ports in said third and fourth sets are arranged so that each small port opposes a large port and each large port opposes a small port.
Claim 18
Dependent Claim
20 words
The method according to claim 16 wherein the small and large ports in said third set alternate with one another.
Claim 19
Dependent Claim
20 words
The method according to claim 17 wherein the small and large ports in said fourth sets alternate with one another.
Claim 20
Dependent Claim
43 words
The method according to claim 16 or 15 wherein the ports in said third set are pointed downwardly, horizontally, or slightly upwardly, and the ports in said fourth set are pointed downwardly, horizontally, or slightly upwardly, into the interior of the boiler furnace.
Claim 21
Independent Claim
114 words
A method for introducing air at levels above the primary level, into a boiler furnace having four walls, said method comprising: (a) introducing air through at least one first jet located at a given elevation on a first wall of the interior of the boiler furnace; (b) introducing air substantially at said given elevation through at least one second jet located on a second wall of the interior of the boiler furnace opposed to the first wall; (c) introducing substantially no air at substantially said given elevation through the remaining walls; wherein (d) said first and second jets are arranged in opposed pairs with each pair including a large jet and a small jet.
Claim 22
Independent Claim
114 words
A method for introducing air at levels above the primary level, into a boiler furnace having four walls, said method comprising: (a) introducing air through at least one first jet located at a given elevation on a first wall of the interior of the boiler furnace; (b) introducing air substantially at said given elevation through at least one second jet located on a second wall of the interior of the boiler furnace opposed to the first wall; (c) introducing substantially no air at substantially said given elevation through the remaining walls; wherein (d) said first and second jets are arranged in opposed pairs with each pair including a large jet and a small jet.
Claim 23
Dependent Claim
31 words
The method according to claim 20 wherein said first jets comprise a single large port and said second jets comprise a single small port that is opposed to said large port.
Claim 24
Dependent Claim
40 words
The method according to claim 20 wherein said first and second jets comprise single similarly sized ports and high pressure air is introduced into one of said ports and low pressure air is introduced into the other of said ports.
Claim 25
Dependent Claim
25 words
A method according to claim 20 wherein a large jet opposes a small jet and a small jet opposes a large jet in each pair.
Claim 26
Dependent Claim
46 words
The method according to claim 20 wherein said first and second jets comprise opposed sets of similarly sized ports and high pressure air is introduced into one port in each pair of ports and low pressure air is introduced into the opposed port in such pair.
Claim 27
Dependent Claim
30 words
The method according to claim 24 wherein ports in each set having high pressure air introduced therein alternate with ports in the same set having low pressure air introduced therein.
Claim 28
Dependent Claim
62 words
The method according to claim 20 wherein: (a) said first jets comprise a first set of small and large ports; (b) said second jets comprise a second set of small and large ports; and (c) the positions of the ports in said sets are arranged so that each small port opposes a large port and each large port opposes a small port.
Claim 29
Dependent Claim
20 words
The method according to claim 26 wherein the small and large ports in said first set alternate with one another.
Claim 30
Dependent Claim
20 words
The method according to claim 27 wherein the small and large ports in said second set alternate with one another.
Claim 31
Dependent Claim
43 words
The method according to claim 26 or 25 wherein the ports in said first set are pointed downwardly, horizontally, or slightly upwardly, and the ports in said second set are pointed downwardly, horizontally, or slightly upwardly, into the interior of the boiler furnace.
Claim 32
Independent Claim
120 words
A method for introducing primary air at the lowest air flow elevation into a boiler furnace having four walls, said method comprising: (a) introducing air through at least one first jet located at a given elevation on a first wall of the interior of the boiler furnace; (b) introducing air at substantially said given elevation through at least one second jet located on a second wall of the interior of the boiler furnace opposed to the first wall; (c) introducing substantially no air at substantially said given elevation through the remaining walls; (d) wherein third and fourth pairs of opposed small and large jets are located at substantially common elevations in the boiler furnace higher than first and second jets.
Claim 33
Independent Claim
120 words
A method for introducing primary air at the lowest air flow elevation into a boiler furnace having four walls, said method comprising: (a) introducing air through at least one first jet located at a given elevation on a first wall of the interior of the boiler furnace; (b) introducing air at substantially said given elevation through at least one second jet located on a second wall of the interior of the boiler furnace opposed to the first wall; (c) introducing substantially no air at substantially said given elevation through the remaining walls; (d) wherein third and fourth pairs of opposed small and large jets are located at substantially common elevations in the boiler furnace higher than first and second jets.
Claim 34
Dependent Claim
31 words
The method according to claim 30 wherein said third jets comprise a single large port and said fourth jets comprise a single small port that is opposed to said large port.
Claim 35
Dependent Claim
39 words
The method according to claim 30 wherein said third and fourth jets comprise single similarly-sized ports and high pressure air is introduced into one of said ports and low pressure air is introduced into the other of said ports.
Claim 36
Dependent Claim
65 words
The method according to claim 30 wherein: (a) said third jets comprise a third set of small and large ports; (b) said fourth jets comprise a fourth set of small and large ports; and (c) the positions of the ports in said third and fourth sets are arranged so that each small port opposed a large port and each large port opposes a small port.
Claim 37
Dependent Claim
20 words
The method according to claim 33 wherein the small and large ports in said third set alternate with one another.
Claim 38
Dependent Claim
20 words
The method according to claim 34 wherein the small and large ports in said fourth set alternate with one another.
Claim 39
Dependent Claim
48 words
The method according to claim 30 wherein the third and fourth jets comprise opposed sets of similarly-sized ports and high pressure air is introduced into one port in each pair of ports in said sets and low pressure air is introduced into the opposed port in such pair.
Claim 40
Dependent Claim
30 words
The method according to claim 36 wherein each set has ports having high pressure air introduced therein alternating with ports in the same set having low pressure air introduced therein.
Claim 41
Dependent Claim
43 words
The method according to claim 33 or 37 wherein the ports in said third set are pointed downwardly, horizontally, or slightly upwardly, and the ports in said fourth set are pointed downwardly, horizontally, or slightly upwardly, into the interior of the boiler furnace.
References Cited (Backward Citations)
US1473665A
Cited
US2730997A
Cited
US3048131A
Cited
US4246853A
Cited
US4712491A
Cited
US4744312A
Cited
US4785744A
Cited
US4823710A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-06-16 | 1995-12-16 | 1996-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-16 | 1999-12-16 | 2000-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-16 | 2003-12-16 | 2004-06-16 | $7700.00 | Window Closed / Lapsed |