JP3105774B2 - Soot removal device in boiler duct - Google Patents
Soot removal device in boiler ductInfo
- Publication number
- JP3105774B2 JP3105774B2 JP07290914A JP29091495A JP3105774B2 JP 3105774 B2 JP3105774 B2 JP 3105774B2 JP 07290914 A JP07290914 A JP 07290914A JP 29091495 A JP29091495 A JP 29091495A JP 3105774 B2 JP3105774 B2 JP 3105774B2
- Authority
- JP
- Japan
- Prior art keywords
- air preheater
- air
- duct
- boiler
- steam
- 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 - Fee Related
Links
- 239000004071 soot Substances 0.000 title claims description 23
- 239000000428 dust Substances 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 239000000446 fuel Substances 0.000 description 9
- 229910052717 sulfur Inorganic materials 0.000 description 7
- 239000011593 sulfur Substances 0.000 description 7
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 5
- 239000002253 acid Substances 0.000 description 5
- 238000004140 cleaning Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 102220008421 rs193922681 Human genes 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Landscapes
- Air Supply (AREA)
- Incineration Of Waste (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、硫黄含有量の多い
燃料を使用するボイラにおいて、ボイラダクト内に空気
予熱器（ＡＨ）と蒸気式空気予熱器（ＳＡＨ）が配置さ
れた場合、空気予熱器から落下する酸性灰堆積による蒸
気式空気予熱器エレメントの閉鎖、腐食の防止を目的と
した除煤装置に関する。BACKGROUND OF THE INVENTION The present invention relates to a boiler using a fuel having a high sulfur content, wherein an air preheater (AH) and a steam type air preheater (SAH) are arranged in a boiler duct. The present invention relates to a soot removal device for closing a steam-type air preheater element and preventing corrosion due to accumulation of acid ash falling from the air.
【０００２】[0002]
【従来の技術】図４は従来の低硫黄燃料を使用したボイ
ラの空気予熱器付近の配置略図である。燃焼に必要な空
気は空気ダクト４を通して押込ファン（ＦＤＦ）３によ
って取り込まれ、蒸気式空気予熱器２、空気予熱器１を
通って、高温となった空気が火炉に送り込まれる。2. Description of the Related Art FIG. 4 is a schematic view showing the arrangement of a conventional boiler using a low sulfur fuel in the vicinity of an air preheater. Air required for combustion is taken in by a forced air fan (FDF) 3 through an air duct 4, passes through a steam type air preheater 2 and an air preheater 1, and hot air is sent to a furnace.
【０００３】一般的にこのようなボイラの場合、空気予
熱器１の低温エレメント部が、排ガス中のＳＯｘの酸露
点以下になると硫酸を発生し金属腐食の原因となるた
め、空気側の温度を蒸気式空気予熱器２によってあらか
じめ加熱することで、排ガスダクト５側の空気予熱器低
温エレメント部が酸露点以下になることを防止してい
る。Generally, in such a boiler, when the low-temperature element portion of the air preheater 1 becomes lower than the acid dew point of SOx in exhaust gas, sulfuric acid is generated and causes metal corrosion. Preheating by the steam air preheater 2 prevents the low temperature element of the air preheater on the exhaust gas duct 5 side from falling below the acid dew point.
【０００４】また、排ガス中の灰による空気予熱器１閉
鎖への配慮から空気予熱器１は縦軸置きになっており、
その配置上の都合から蒸気式空気予熱器２も縦置きにな
り空気予熱器１の下部に設置されている場合が多い。The air preheater 1 is placed on the vertical axis in consideration of closing of the air preheater 1 due to ash in exhaust gas.
In many cases, the steam-type air preheater 2 is also installed vertically below the air preheater 1 because of its layout.
【０００５】灰による予熱器エレメント閉鎖対策とし
て、空気予熱器側には洗浄装置であるスーツブロア（Ｓ
Ｂ）が配置されており、運転中における洗浄も可能であ
るが、蒸気式空気予熱器には設置されていないのが一般
的である。[0005] As a countermeasure against closing of the preheater element by ash, a suit blower (S) as a cleaning device is provided on the air preheater side.
B) is arranged and cleaning during operation is possible, but is generally not installed in the steam-type air preheater.
【０００６】[0006]
【発明が解決しようとする課題】ボイラ排ガスによって
空気を加熱する空気予熱器と、その下方に蒸気式空気予
熱器を配置したボイラダクト構成の場合において、ボイ
ラ内で硫黄含有量の多い燃料を燃焼させると、ボイラユ
ニット停止時に、空気予熱器低温部エレメント下端付近
の付着酸性灰が雰囲気温度の低下と共に蒸気式空気予熱
器の空気ダクトへも落下し、蒸気式空気予熱器上部に堆
積してエレメントを閉塞してしまう不都合が生じる（図
５参照）。In the case of an air preheater for heating air by boiler exhaust gas and a boiler duct having a steam type air preheater disposed below the air preheater, fuel having a high sulfur content is burned in the boiler. When the boiler unit is stopped, the acid ash adhering near the lower end of the low-temperature element of the air preheater falls into the air duct of the steam air preheater as the ambient temperature decreases, and accumulates on the upper part of the steam air preheater to remove the element. The inconvenience of blocking occurs (see FIG. 5).
【０００７】このエレメント封鎖により、ユニット再起
動時において、空気側の円滑な流動が阻害される為、押
込ファンの能力低下、出口ドラフト上昇が起こり、適切
なドラフト制御が行えなくなる問題が生じていた。[0007] When the unit is restarted, the smooth flow of the air side is hindered by the blockage of the element, so that the performance of the push-in fan is reduced and the draft of the outlet rises, so that there has been a problem that appropriate draft control cannot be performed. .
【０００８】本発明は、上記問題を解決するため、ボイ
ラダクト内に設置した空気予熱器から蒸気式空気予熱器
にボイラダクト内を落下して来る煤じんを除去でき、し
かも既存の配置機器の改造を最小限にとどめ、低コスト
で対処可能な除煤装置を提供することを課題とするもの
である。According to the present invention, to solve the above-mentioned problems, it is possible to remove soot and dust falling from the air preheater installed in the boiler duct to the steam-type air preheater in the boiler duct, and to modify existing equipment. It is an object of the present invention to provide a soot removing device which can be dealt with at a low cost while keeping it to a minimum.
【０００９】[0009]
【課題を解決するための手段】本発明は、ボイラ排ガス
によって空気を加熱する空気予熱器とその下方に蒸気式
空気加熱器とを配設したボイラダクトにおける前記課題
を解決するため、その空気予熱器と蒸気式空気予熱器の
間に、空気流動を許容するが同空気ダクト内を落下して
来る煤じんを受けとめる除煤構造物を配置したボイラダ
クトにおける除煤装置を提供する。SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems in a boiler duct having an air preheater for heating air by boiler exhaust gas and a steam type air heater below the air preheater. A soot removal device in a boiler duct in which a soot removal structure that allows air flow but receives soot and dust falling in the air duct is disposed between the boiler duct and a steam type air preheater.
【００１０】この除煤構造物としては、山形を下方に向
けて複数本のアングル材を千鳥状に配置した構成のもの
など、下方からの空気流動に対し抵抗にならずに降灰を
受けとめるように構成した適宜の構造のものを採用して
よい。The soot removing structure has a structure in which a plurality of angle members are arranged in a zigzag shape with the mountain shape facing downward so as to receive ash fall without resistance to air flow from below. An appropriate structure may be adopted.
【００１１】本発明によって空気ダクト内に配置された
除煤構造物は、落下して来る灰を堆積させ、蒸気式空気
予熱器エレメントへの灰の堆積を防止する。ユニット停
止時にこの除煤構造物に堆積した灰は起動前に回収し、
次回ユニット停止時に備える。[0011] The soot removal structure disposed in the air duct according to the present invention accumulates falling ash and prevents ash from accumulating on the steam air preheater element. The ash that has accumulated on this de-soot structure when the unit is stopped is collected before starting,
Prepare for the next unit stop.
【００１２】このようにして本発明によれば、比較的簡
単に低コストで、蒸気式空気予熱器への降灰による不都
合に対応ができる。本発明は、例えばこれから将来、低
硫黄燃料から高硫黄含有燃料への燃料転換を行う場合、
そのダクト構造から発生する上記課題に対し、有効な解
決手段である。As described above, according to the present invention, it is possible to relatively easily cope with the inconvenience caused by ash fall on the steam-type air preheater at low cost. The present invention, for example, in the future, when performing fuel conversion from low sulfur fuel to high sulfur content fuel,
This is an effective solution to the above-mentioned problem arising from the duct structure.
【００１３】[0013]
【発明の実施の形態】以下、本発明の除煤装置を図１〜
図３に示した実施の一形態に基づいて具体的に説明す
る。なお、以下の実施の形態において、図４，図５に示
した従来の装置と同じ構成の部分には説明を簡単にする
ため同じ符号を付してある。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a soot removing apparatus according to the present invention will be described with reference to FIGS.
A specific description will be given based on the embodiment shown in FIG. In the following embodiments, the same components as those of the conventional apparatus shown in FIGS. 4 and 5 are denoted by the same reference numerals for simplification of description.
【００１４】本発明による除煤装置では、図１に示すよ
うに空気ダクト４において、空気予熱器１とその下方の
蒸気式空気予熱器２の間に、下方からの空気通過は許容
するが、空気予熱器１から落下して来る降下灰は通過さ
せない機能をもつ除煤構造物６が配設されている。In the soot removal apparatus according to the present invention, as shown in FIG. 1, air can be allowed to pass from below through the air duct 4 between the air preheater 1 and the steam-type air preheater 2 therebelow. A soot removal structure 6 having a function of preventing ash falling from the air preheater 1 from passing therethrough is provided.
【００１５】次に、本発明のこのような概念によって構
成された除煤構造物６について図２，図３によって説明
する。図２，図３において空気予熱器１、蒸気式空気予
熱器２の間の空気ダクト４内には、空気予熱器１方向に
開いたアングル７を紙面垂直方向に長手をもって千鳥配
列に複数本配置している。Next, the soot removing structure 6 constructed according to the concept of the present invention will be described with reference to FIGS. 2 and 3, in the air duct 4 between the air preheater 1 and the steam-type air preheater 2, a plurality of angles 7 opened in the direction of the air preheater 1 are arranged in a zigzag arrangement with a length in the direction perpendicular to the paper. doing.
【００１６】図２は通常運転時の状態を示しており、空
気ダクト４を通して押込ファン３によって取り込まれた
空気は蒸気式空気予熱器２を通過し、アングル７の列に
入る。このときアングル７は空気の流れ方向に対して山
形が向かい合うかたちとなり、またアングルの配列が千
鳥状になっているため、空気の流れが比較的阻害されず
円滑に流れるようになっている。FIG. 2 shows a state during normal operation, in which air taken in by the pushing fan 3 through the air duct 4 passes through the steam-type air preheater 2 and enters a row of angles 7. At this time, the angle 7 has a shape in which the angle is opposed to the air flow direction, and the arrangement of the angles is staggered, so that the air flow is relatively undisturbed and flows smoothly.
【００１７】一方、図３はユニット停止時の状態を示し
ている。このとき、空気予熱器１のまわりでは雰囲気の
温度低下により空気予熱器低温ユニット下部から排ガス
中のＳＯｘの影響により酸性灰が発生し、重力によって
落下する。この結果、落下した灰は空気予熱器２下にあ
るアングル７のＶ形のくぼみに堆積することになり、ア
ングル７の下にある蒸気式空気予熱器２への灰の堆積を
防ぐ役割をする。FIG. 3 shows a state when the unit is stopped. At this time, around the air preheater 1, an acid ash is generated from the lower part of the low temperature unit of the air preheater due to the influence of SOx in the exhaust gas due to a decrease in the temperature of the atmosphere, and falls by gravity. As a result, the fallen ash will accumulate in the V-shaped recess of the angle 7 below the air preheater 2 and serve to prevent ash from accumulating on the steam-type air preheater 2 below the angle 7. .
【００１８】堆積した灰はアングル７のくぼみから物理
的に除去することになるが、アングル７が存在しない場
合に比べ、蒸気式空気予熱器エレメントの清掃の手間が
なくなり、簡単に行うことが出来る。アングル７から灰
を除去した後、ユニットの再起動を行えば、図２の状態
に戻ることになり、次回のユニット停止時に備えること
ができることになる。Although the deposited ash is physically removed from the recess of the angle 7, cleaning of the steam-type air preheater element is easier than in the case where the angle 7 is not present, and can be performed easily. . If the unit is restarted after the ash is removed from the angle 7, the state returns to the state shown in FIG. 2, and it is possible to prepare for the next stop of the unit.
【００１９】[0019]
【発明の効果】以上説明したように、本発明はボイラ排
ガスによって空気を加熱する空気予熱器とその下方に蒸
気式空気加熱器とを配設したボイラダクトにおいて、そ
の空気予熱器と蒸気式空気予熱器との間に、空気流動を
許容するが空気ダクト内を落下して来る煤じんを受けと
める除煤構造物を配置したもので、既存の機器配置の改
造を最小限にとどめ、低コストで降灰に対処する除煤装
置を提供することができる。As described above, the present invention relates to a boiler duct having an air preheater for heating air by boiler exhaust gas and a steam type air heater below the air preheater, the air preheater and the steam type air preheater. A soot removal structure that allows air flow but catches soot and dust that has fallen in the air duct is placed between the equipment and the ash fall at a low cost, minimizing the modification of the existing equipment layout. Can be provided.
【００２０】本発明による装置は、特にボイラの燃料を
低硫黄燃料から硫黄含有量の多い燃料に切り替える改造
を行う場合、空気予熱器まわりで発生する降灰による蒸
気式空気予熱器エレメントの閉塞に対し有効な手段であ
る。The device according to the invention is particularly suitable for retrofits in which the fuel of the boiler is switched from a low-sulfur fuel to a high-sulfur fuel, against the blockage of the steam-type air preheater element due to ash fall around the air preheater. It is an effective means.
【図１】本発明による除煤装置の概念図。FIG. 1 is a conceptual diagram of a soot removal device according to the present invention.
【図２】本発明の実施の一形態に係わる除煤装置の運転
時の状態を示す説明図。FIG. 2 is an explanatory diagram showing a state during operation of the soot removing device according to the embodiment of the present invention.
【図３】本発明の実施の一形態に係わる除煤装置の停缶
時の状態を示す説明図。FIG. 3 is an explanatory diagram showing a state of the soot removing device according to the embodiment of the present invention when the can is stopped.
【図４】従来のボイラにみられる運転時の空気予熱器ま
わりのダクト断面図。FIG. 4 is a cross-sectional view of a duct around an air preheater during operation as seen in a conventional boiler.
【図５】従来のボイラにみられる停缶時の空気予熱器ま
わりのダクト断面図。FIG. 5 is a cross-sectional view of a duct around an air preheater in a conventional boiler when the tank is stopped.
１ 空気予熱器（ＡＨ） ２ 蒸気式空気予熱器（ＳＡＨ） ３ 押込通風機（ＦＤＦ） ４ 空気ダクト ５ 排ガスダクト ６ 除煤構造物 ７ Ｖ形のアングル DESCRIPTION OF SYMBOLS 1 Air preheater (AH) 2 Steam type air preheater (SAH) 3 Push ventilation (FDF) 4 Air duct 5 Exhaust gas duct 6 Soot removal structure 7 V type angle
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) F23J 3/00 F23L 1/00 F23L 15/02 F23J 3/04 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 7 , DB name) F23J 3/00 F23L 1/00 F23L 15/02 F23J 3/04
Claims (1)
気予熱器とその下方に蒸気式空気加熱器とを配設したボ
イラダクトにおいて、前記空気予熱器と前記蒸気式空気
予熱器の間に、空気流動を許容するが同空気ダクト内を
落下して来る煤じんを受けとめる除煤構造物を配置した
ことを特徴とするボイラダクトにおける除煤装置。In a boiler duct having an air preheater for heating air by boiler exhaust gas and a steam type air heater below the air preheater, an air flow is generated between the air preheater and the steam type air preheater. A soot removing device in a boiler duct, wherein a soot removing structure that allows but receives soot and dust falling in the air duct is arranged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07290914A JP3105774B2 (en) | 1995-11-09 | 1995-11-09 | Soot removal device in boiler duct |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07290914A JP3105774B2 (en) | 1995-11-09 | 1995-11-09 | Soot removal device in boiler duct |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09133336A JPH09133336A (en) | 1997-05-20 |
| JP3105774B2 true JP3105774B2 (en) | 2000-11-06 |
Family
ID=17762149
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP07290914A Expired - Fee Related JP3105774B2 (en) | 1995-11-09 | 1995-11-09 | Soot removal device in boiler duct |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3105774B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0676779U (en) * | 1992-01-27 | 1994-10-28 | 株式会社カクダイ | Switching valve with purified water spout |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111810982B (en) * | 2020-06-24 | 2025-05-13 | 东方电气集团东方锅炉股份有限公司 | Rotary air preheater system and working method thereof |
| CN115597082A (en) * | 2022-10-24 | 2023-01-13 | 吉林同鑫热力集团股份有限公司（Cn） | Energy-concerving and environment-protective air preheating equipment that is used for coal fired boiler |
-
1995
- 1995-11-09 JP JP07290914A patent/JP3105774B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0676779U (en) * | 1992-01-27 | 1994-10-28 | 株式会社カクダイ | Switching valve with purified water spout |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09133336A (en) | 1997-05-20 |
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