EP0160146A2
Expired / Lapsed
EP
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Apparatus for coal combustion
Assignee: Mitsubishi Power Ltd
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Filing: 1984-07-03
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Granted: —
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Expires: 2004-07-03
Abstract
Abstract A coal combustion apparatus capable of improving NO x reduction to a large extent is provided, which apparatus comprises a pulverized coal-feeding pipe (abbreviated to coal pipe) inserted into a burner throat on the lateral wall of a combustion furnace and for feeding the coal and air into the furnace; a means for feeding the coal and air into the coal pipe; a secondary air passageway formed between the coal pipe and a secondary air-feeding pipe provided on the outer peripheral side of the coal pipe; a ternary air passageway formed on the outer peripheral side of the secondary air-feeding pipe; a means for feeding air or an oxygen-containing gas into the secondary air passageway and that into the ternary air passageway; and a bluff body having a cross-section of a L-letter form provided at the tip end of the coal pipe.
Inventors
- 👤 Shigeki Kure Works Morita
- 👤 Tadahisa Kure Works Masai
- 👤 Shigeto Kure Works Nakashita
- 👤 Toshio Kure Works Uemura
- 👤 Fumio Kure Works Kouda
- 👤 Tsuyoshi Kure Works Nawata
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 20:40
CPC Classifications
F; F23; F23D; F23D1/00; F23D1/02
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
146 words
An apparatus for coal combustion which comprises; a pulverized coal-feeding pipe 8 (hereinafter referred to as pulverized coal pipe) inserted into a burner throat 18 on the lateral wall of a combustion furnace and for feeding pulverized coal together with air into the combustion furnace; a means for feeding pulverized coal and air into the pulverized coal pipe 8; a secondary air passageway formed between the pulverized coal pipe 8 and a secondary air-feeding pipe 10 provided on the outer peripheral side of the pulverized coal pipe 8; a ternary air passageway formed on the outer peripheral side of the secondary air-feeding pipe 10; a means for feeding air or an oxygen-containing gas into said secondary air passageway and into said ternary air passageway; and a flange 20 having an L-shaped cross-section surrounding the tip end of the pulverized coal pipe 8 and extending away therefrom.
Claim 2
Independent Claim
146 words
An apparatus for coal combustion which comprises; a pulverized coal-feeding pipe 8 (hereinafter referred to as pulverized coal pipe) inserted into a burner throat 18 on the lateral wall of a combustion furnace and for feeding pulverized coal together with air into the combustion furnace; a means for feeding pulverized coal and air into the pulverized coal pipe 8; a secondary air passageway formed between the pulverized coal pipe 8 and a secondary air-feeding pipe 10 provided on the outer peripheral side of the pulverized coal pipe 8; a ternary air passageway formed on the outer peripheral side of the secondary air-feeding pipe 10; a means for feeding air or an oxygen-containing gas into said secondary air passageway and into said ternary air passageway; and a flange 20 having an L-shaped cross-section surrounding the tip end of the pulverized coal pipe 8 and extending away therefrom.
Claim 3
Dependent Claim
45 words
An apparatus according to Claim 1, wherein the ratio of the inner dimension d l of said flange 20 to the inner diameter d 2 of said pulverized coal pipe 8 (d l /d 2 ) is in the range of from 0.7 to 1.0.
Claim 4
Dependent Claim
28 words
An apparatus according to Claim 1 or Claim 2, wherein the angle formed between two sides of the L-shape of said flange 20 is 90 0 or more.
Claim 5
Independent Claim
82 words
An apparatus according to any one of Claims 1 to 3, wherein the ratio of the difference between the outer diameter d 3 of said flange 20 and the inner diameter d 2 of said pulverized coal pipe 8 (d 3 -d 2 ) to the difference between the inner diameter d 4 of said secondary air pipe 10 and the inner diameter d 2 of said pulverized coal pipe 8 (d 4 -d 2 ), i.e. (d3-d2)/(d4-d2) is 0.5 or more.
Claim 6
Independent Claim
45 words
An apparatus according to any foregoing claim, wherein an outward guide sleeve 22 is provided at the tip end of said secondary air-feeding pipe 8, and the angle 8 2 that the guide sleeve 22 makes with the horizontal axis is 30 0 or more.
Claim 7
Independent Claim
25 words
An apparatus according to any foregoing claim, wherein said burner throat 18 forms a funnel-like part 26 having its diameter enlarged toward the combustion furnace.
Claim 8
Dependent Claim
93 words
An apparatus according to Claim 5, wherein said burner throat 18 forms a furnnel-like part 26 having its diameter enlarged toward the combustion furnace, and the ratio of the difference between the outer diameter d 5 of said guide sleeve 22 and the inner diameter d 4 of said secondary air-feeding pipe 10 (d 5 -d 4 ) to the difference between the inner diameter d 6 of said burner throat 18 and the inner diameter d 4 of said secondary air-feeding pipe 10 (d 6 -d 4 ) is 0.5 or more.
Claim 9
Independent Claim
27 words
An apparatus according to any foregoing claim wherein a whirling means 16, 16A is provided in the respective passageways of said secondary air and said ternary air.
Claim 10
Dependent Claim
26 words
An apparatus according to Claim 8, wherein the whirling direction of said secondary air is the same as or contrary to that of said ternary air.
Claim 11
Independent Claim
47 words
An apparatus according to any foregoing claim, wherein said secondary air passageway and said ternary air passageway independently have a respective air box 12, 14 to thereby make it possible to independently control the respective flow amounts and injection pressures of said secondary air and ternary air.
Claim 12
Independent Claim
48 words
An apparatus according to any one of Claims 1 to 9, wherein said secondary air passageway and said ternary air passageway independently have a respective fan, to thereby make it possible to independently control the respective flow amounts and injection pressures of said secondary air and ternary air.
Claim 13
Independent Claim
53 words
An apparatus according to any one of Claims 1 to 9, wherein said secondary air passageway and said ternary air passageway independently have either an air box 12, 14 or a fan, to thereby make it possible to independently control the respective flow amount and injection pressures of said secondary and ternary airs.
Claim 14
Independent Claim
28 words
An apparatus according to any foregoing claim, constructed so that the amount of said ternary air injected can be 2.5 times or more that of said secondary air.
References Cited (Backward Citations)
No citation records indexed.
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