EP0280568A2
Expired / Lapsed
EP
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Apparatus for low concentration NOx combustion
Assignee: Mitsubishi Power Ltd
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Filing: 1988-02-26
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Granted: —
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Expires: 2008-02-26
Abstract
Abstract A combustion apparatus for low concentration NOx for burning gas, oil and coal along the same axis, provided with a means (4,5,6) for carrying pulverized coal by a primary air, a means (2,11,13) for feeding a gas fuel through a gas nozzle (3,12), a means (17,18,20) for separating combustion air into a secondary air and a tertiary air and feeding these airs, and a means (2,3) for feeding and spraying an oil, and which apparatus is characterized by providing an annular space part (44) between the flow paths of the secondary air and the tertiary air; and also arranging the gas nozzle (12) penetrating through the annular space part (44) in a movable manner in the axial direction.
Inventors
- 👤 Tadahisa Kure Works Masai
- 👤 Shigeki Kure Works Morita
- 👤 Shigeto Kure Works Nakashita
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 20:30
CPC Classifications
F; F23; F23D; F23D17/00; F23D1/00
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
227 words
An apparatus for low concentration NOx combustion which comprises: a pulverized coal-feeding pipe (pulverized coal pipe) inserted into a burner throat 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; an auxiliary fuel-feeding pipe inserted into the pulverized coal pipe and a nozzle provided at the tip end of said pipe; a secondary air passageway formed between the pulverized coal pipe and a secondary air-feeding pipe, said secondary air-feeding pipe being concentric with the pulverized coal pipe and provided on the outer peripheral side of the pulverized coal pipe; a tertiary 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 said secondary air passageway and that into said tertiary air passageway; a flame-retaining means provided about the exit of said pulverized coal pipe; a means for feeding oil or gas into the auxiliary fuel-feeding pipe; an annular space part provided on the inner peripherical side of the secondary air-feeding pipe; gas-feeding pipes inserted in said annular space part in a movable manner in the axial direction thereof, the tip end of the gas-feeding pipe being provided with a gas nozzle; a means for feeding gas into said gas-feeding pipe.
Claim 2
Independent Claim
227 words
An apparatus for low concentration NOx combustion which comprises: a pulverized coal-feeding pipe (pulverized coal pipe) inserted into a burner throat 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; an auxiliary fuel-feeding pipe inserted into the pulverized coal pipe and a nozzle provided at the tip end of said pipe; a secondary air passageway formed between the pulverized coal pipe and a secondary air-feeding pipe, said secondary air-feeding pipe being concentric with the pulverized coal pipe and provided on the outer peripheral side of the pulverized coal pipe; a tertiary 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 said secondary air passageway and that into said tertiary air passageway; a flame-retaining means provided about the exit of said pulverized coal pipe; a means for feeding oil or gas into the auxiliary fuel-feeding pipe; an annular space part provided on the inner peripherical side of the secondary air-feeding pipe; gas-feeding pipes inserted in said annular space part in a movable manner in the axial direction thereof, the tip end of the gas-feeding pipe being provided with a gas nozzle; a means for feeding gas into said gas-feeding pipe.
Claim 3
Dependent Claim
60 words
An apparatus for low concentration NOx combustion according to claim 1, wherein said annular space is surrounding by a secondary inner sleeve, a secondary outer sleeve and annular end plates provided at the both ends of said sleeves to form said annular space part, said annular end plates having a plurality of holes through which said gas-feeding pipes are penetrated.
Claim 4
Dependent Claim
29 words
An apparatus for low concentration NOx combustion according to claim 2, wherein said outer secondary sleeve is common with and constituted of a part of said secondary air-feeding pipe.
Claim 5
Dependent Claim
26 words
An apparatus for low concentration NOx combustion according to claim 1, wherein a guide sleeve is provided at the tip end of said secondary air-feeding pipe.
Claim 6
Dependent Claim
46 words
An apparatus for low concentration NOx combustion according to claim 1, wherein said gas nozzle is provided with a sub-hole besides main ejecting hole of said gas nozzle, which sub-hole is arranged so that gas ejected from said sub-hole can be fed to said annular plate.
Claim 7
Dependent Claim
37 words
An apparatus for low concentration NOx combustion according to claim 1, wherein said flame-retaining means is a plate having a L-letter form cross-section provided at the tip end of said pulverized coal pipe and encircling said pipe.
Claim 8
Dependent Claim
54 words
An apparatus for low concentration NOx combustion according to claim 6, wherein said flame retaining plate provided at the tip end of said pulverized coal pipe has a projected part toward the center of said pulverized coal pipe, the inner diameter of said projected part being smaller than that of said pulverized coal pipe.
Claim 9
Dependent Claim
25 words
An apparatus for low concentration NOx combustion according to claim 7, wherein the inner edge of said projected part is of convex and concave shape.
Claim 10
Dependent Claim
54 words
An apparatus for low concentration NOx combustion according to claim 1, wherein an annular plate having a projected part toward the center of said secondary air-feeding pipe is provided at the tip end of said secondary air-feeding pipe, the inner diameter of said projected part being smaller than that of said secondary air-feeding pipe.
Claim 11
Dependent Claim
25 words
An apparatus for low concentration NOx combustion according to claim 9, wherein the inner edge of said projected part is of convex and concave shape.
Claim 12
Dependent Claim
39 words
An apparatus for low concentration NOx combustion according to claim 2, wherein a guide sleeve is provided at the tip end of said secondary outer sleeve and the other end thereof is extended to form said annular end plate.
Claim 13
Dependent Claim
38 words
An apparatus for low concentration NOx combustion according to claim 2, wherein one or a plurality of holes for introducing a portion of said secondary air is provided on said secondary outer sleeve or said secondary inner sleeve.
Claim 14
Dependent Claim
35 words
An apparatus for low concentration NOx combustion according to claim 2, wherein an annular gap for passing a portion of said secondary air is provided between said secondary outer sleeve and said secondary air-feeding pipe.
References Cited (Backward Citations)
No citation records indexed.
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