JPH026401B2 - - Google Patents
Info
- Publication number
- JPH026401B2 JPH026401B2 JP59103731A JP10373184A JPH026401B2 JP H026401 B2 JPH026401 B2 JP H026401B2 JP 59103731 A JP59103731 A JP 59103731A JP 10373184 A JP10373184 A JP 10373184A JP H026401 B2 JPH026401 B2 JP H026401B2
- Authority
- JP
- Japan
- Prior art keywords
- nox
- combustion
- grate
- gas
- combustion furnace
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23B—METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
- F23B7/00—Combustion techniques; Other solid-fuel combustion apparatus
- F23B7/002—Combustion techniques; Other solid-fuel combustion apparatus characterised by gas flow arrangements
- F23B7/007—Combustion techniques; Other solid-fuel combustion apparatus characterised by gas flow arrangements with fluegas recirculation to combustion chamber
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Solid-Fuel Combustion (AREA)
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、固体燃料を移床火格子上で燃焼させ
る燃焼炉に関する。より詳くは、NOxの発生を
抑制した燃焼炉に関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a combustion furnace for burning solid fuel on a moving grate. More specifically, the present invention relates to a combustion furnace that suppresses the generation of NOx.
従来の技術
固体燃料を移床火格子上で燃焼させる陸用ボイ
ラ等の燃焼炉では、火格子の前半部で燃焼が活発
に行われ、燃料層から発生するガス中には酸素は
殆んど含まれず、NOx及び還元性のNH3、HCN
等のガスが多量に含まれるのに対し、火格子末端
部では、高酸素濃度のガスが発生する。従来の燃
焼炉では、これら２種類のガスは殆んど混合しな
いで上昇するため、前者の可燃性ガスを完全燃焼
させるため、炉上部から多量の空気を供給する
が、高酸素濃度の空気と一気に接触することによ
つて、高濃度のNOxが発生する。Conventional technology In a combustion furnace such as a land boiler that burns solid fuel on a moving bed grate, combustion occurs actively in the front half of the grate, and there is almost no oxygen in the gas generated from the fuel layer. Contains no NOx and reducing NH 3 , HCN
However, at the end of the grate, gas with a high oxygen concentration is generated. In conventional combustion furnaces, these two types of gas rise without mixing with each other, so in order to completely burn the former flammable gas, a large amount of air is supplied from the top of the furnace. A high concentration of NOx is generated by contacting them all at once.
このような従来の燃焼炉を第２図に示す。 Such a conventional combustion furnace is shown in FIG.
第２図の燃焼炉では、フイーダー１によつて移
床火格子２上に供給された燃料は、燃焼用空気３
によつて燃焼し、発生した発生ガス４は、燃焼炉
５を経て炉外に排出され、熱交換器６によつて減
温される。また、燃焼灰７は、火格子末端より排
出される。火格子２上の燃焼ガスの分布は、高可
燃ガス濃度域（NOx及び還元性のHCN、NH3を
含む）８と、高酸素濃度域９に分かれるが、これ
ら両者は容易に混合しないため、炉上部からの多
量の空気の供給によつて完全燃焼をはかるが、そ
の際、高濃度のNOxが発生することになる。 In the combustion furnace shown in FIG.
The gas 4 generated by combustion is discharged outside the furnace through a combustion furnace 5, and its temperature is reduced by a heat exchanger 6. Further, the combustion ash 7 is discharged from the end of the grate. The distribution of combustion gas on the grate 2 is divided into a high combustible gas concentration area (including NOx and reducing HCN and NH3 ) 8 and a high oxygen concentration area 9, but since these two do not mix easily, Complete combustion is achieved by supplying a large amount of air from the top of the furnace, but a high concentration of NOx is generated during this process.
すなわち、現状の燃焼炉では、NOx濃度が高
く、そのままでは、NOx排出規制をクリアでき
ない。 In other words, current combustion furnaces have high NOx concentrations and cannot pass NOx emission regulations if they are left unchanged.
発明が解決しようとする問題点
本発明は、上記従来の燃焼炉での欠点を解消
し、排出NOx濃度を低減し、NOx排出規制をク
リアすることのできる燃焼炉を提供するものであ
る。Problems to be Solved by the Invention The present invention provides a combustion furnace that can eliminate the drawbacks of the conventional combustion furnaces described above, reduce the exhaust NOx concentration, and meet NOx emission regulations.
問題点を解決するための手段
本発明は、固体燃料を移床火格子上で燃焼させ
る燃焼炉において、該火格子の上部に燃焼再循環
ガスを吹込む再循環ガス流路を連通させたことを
特徴とする燃焼炉に関する。Means for Solving the Problems The present invention provides a combustion furnace in which solid fuel is burned on a moving bed grate, in which a recirculation gas passage through which combustion recirculation gas is blown is communicated with the upper part of the grate. The present invention relates to a combustion furnace characterized by:
作 用 本発明装置の概要を第１図に示す。Effect An outline of the device of the present invention is shown in FIG.
第１図において、符号１〜９は、第２図のもの
と共通である。本発明装置では、火格子２の上部
に、熱交換器６より排出される低酸素濃度の再循
環ガス１０を吹込むため、高可燃ガス濃度域８と
高酸素濃度域９が低酸素状況下で良好に混合し、
高可燃ガス濃度域８中のNOxは、HCN、NH3等
の還元性ガスによつて還元され、NOxの発生が
抑制できる。 In FIG. 1, numerals 1 to 9 are the same as those in FIG. In the device of the present invention, since the recirculated gas 10 with a low oxygen concentration discharged from the heat exchanger 6 is blown into the upper part of the grate 2, the high combustible gas concentration area 8 and the high oxygen concentration area 9 are under a low oxygen condition. Mix well with
NOx in the high combustible gas concentration region 8 is reduced by reducing gases such as HCN and NH 3 , and the generation of NOx can be suppressed.
高可燃ガス濃度（NOx及びHCN、NH3）領域
８の還元性ガスHCN、NH3は、高酸素濃度条件
下では、NOxへの転換率が高くなるが、低酸素
濃度条件下では、NOxをN2に還元する作用をも
つ。従つて、HCN、NH3をNOxに転換させず、
且つ、NOxの還元に役立てるには、低酸素濃度
条件下でHCN、NH3とNOxを十分に混合させる
ことが必要であり、これは、低酸素濃度の再循環
ガスを火格子２上に吹込むことによつて可能にな
る。本発明装置によれば、例えば、O24〜６％、
温度250〜350℃程度の再循環ガスを導入すること
により、20〜30％程度のNOx低減率を得ること
ができる。 High combustible gas concentration (NOx and HCN, NH 3 ) Reducing gases HCN and NH 3 in region 8 have a high conversion rate to NOx under high oxygen concentration conditions, but under low oxygen concentration conditions, they convert into NOx. It has the effect of reducing to N2 . Therefore, HCN and NH 3 are not converted to NOx,
In addition, to help reduce NOx, it is necessary to sufficiently mix HCN, NH 3 and NOx under low oxygen concentration conditions, which requires blowing the recirculated gas with low oxygen concentration onto the grate 2. This becomes possible by incorporating According to the device of the present invention, for example, O 2 4-6%,
By introducing recirculated gas at a temperature of about 250 to 350°C, a NOx reduction rate of about 20 to 30% can be obtained.
発明の効果
燃料層の上部に低酸素濃度の再循環ガスを吹込
むことによつて、燃料層から発生する２種類のガ
スを混合させ、NH8、NCNによるNOxの還元を
図ることができる。Effects of the Invention By blowing recirculated gas with a low oxygen concentration into the upper part of the fuel layer, two types of gases generated from the fuel layer can be mixed, and NOx can be reduced by NH 8 and NCN.
第１図は、本発明に係る燃焼炉の概要を示し、
第２図は、従来の燃焼炉の概要を示す。
FIG. 1 shows an outline of a combustion furnace according to the present invention,
FIG. 2 shows an outline of a conventional combustion furnace.
Claims (1)
において、該火格子の上部に燃焼再循環ガスを吹
込む再循環ガス流路を連通させたことを特徴とす
る燃焼炉。1. A combustion furnace in which solid fuel is combusted on a moving grate, characterized in that a recirculating gas passage through which combustion recirculating gas is blown is connected to the upper part of the grate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10373184A JPS60248904A (en) | 1984-05-24 | 1984-05-24 | Combustion furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10373184A JPS60248904A (en) | 1984-05-24 | 1984-05-24 | Combustion furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60248904A JPS60248904A (en) | 1985-12-09 |
| JPH026401B2 true JPH026401B2 (en) | 1990-02-09 |
Family
ID=14361784
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10373184A Granted JPS60248904A (en) | 1984-05-24 | 1984-05-24 | Combustion furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60248904A (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS586307A (en) * | 1981-07-04 | 1983-01-13 | Osaka Gas Co Ltd | Method for combustion of solid fuel |
-
1984
- 1984-05-24 JP JP10373184A patent/JPS60248904A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60248904A (en) | 1985-12-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |