JPH07213867A - Boiler waste gas treating device - Google Patents
Boiler waste gas treating deviceInfo
- Publication number
- JPH07213867A JPH07213867A JP6014350A JP1435094A JPH07213867A JP H07213867 A JPH07213867 A JP H07213867A JP 6014350 A JP6014350 A JP 6014350A JP 1435094 A JP1435094 A JP 1435094A JP H07213867 A JPH07213867 A JP H07213867A
- Authority
- JP
- Japan
- Prior art keywords
- boiler
- denitrator
- air preheater
- heat exchanger
- gas
- 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.)
- Pending
Links
Landscapes
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Chimneys And Flues (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は石炭、油、ガスなどの化
石燃料や産業副生燃料を燃焼させるボイラの排ガス処理
装置、特に脱硝装置におけるＳＯ2 酸化作用を抑制する
ために脱硝装置通過ガスの温度を低下させる手段に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas treatment apparatus for a boiler that burns fossil fuels such as coal, oil and gas and industrial by-product fuels, and in particular, a denitration apparatus passing gas for suppressing SO 2 oxidation in a denitration apparatus. The means for reducing the temperature of.
【０００２】[0002]
【従来の技術】図３は従来のボイラにおける排ガス系統
の一例を示す図である。従来のボイラにおいては節炭器
（１）などボイラ伝熱面出口に脱硝装置（２）を設置
し、その下流に空気予熱器（３）等の熱交換器を配置し
ている。前記燃料を燃焼させるボイラの燃焼排ガス中に
は、窒素酸化物（以下ＮＯx と記す）の他に燃料中に含
まれたＳ分から発生する硫黄酸化物（以下ＳＯx と記
す）が含まれている。脱硝装置は、ＮＯx の除去を目的
として通例ボイラ出口に設置されるが、一方で脱硝触媒
の種類や成分によっては酸化作用を有するから、その場
合にはＳＯ2 が酸化してＳＯ3 が生成する。触媒のＳＯ
2 酸化作用は、通過ガス温度が高い程高い。2. Description of the Related Art FIG. 3 is a diagram showing an example of an exhaust gas system in a conventional boiler. In a conventional boiler, a denitration device (2) is installed at the boiler heat transfer surface outlet such as a coal economizer (1), and a heat exchanger such as an air preheater (3) is arranged downstream thereof. In the combustion exhaust gas of the boiler that burns the fuel, in addition to nitrogen oxides (hereinafter referred to as NO x ), sulfur oxides (hereinafter referred to as SO x ) generated from S components contained in the fuel are included. There is. The denitration device is usually installed at the boiler outlet for the purpose of removing NO x , but on the other hand, it has an oxidizing action depending on the type and components of the denitration catalyst. In that case, SO 2 is oxidized and SO 3 is produced. To do. SO of catalyst
2 The oxidation effect is higher as the passing gas temperature is higher.
【０００３】[0003]
【発明が解決しようとする課題】脱硝装置は、触媒の脱
硝性能維持の観点から温度条件を限定しており、一般に
ボイラ出口、場合によってはボイラの中間部に設置され
る。したがって脱硝装置を通過するガスの温度はボイラ
の運転状況によって変化する。通過ガスの温度が何らか
の要因で上昇すると、脱硝装置のＳＯ2 酸化率も上昇
し、ＳＯ3 が増加する。このＳＯ3 は空気予熱器の伝熱
エレメントや電気集塵器の電極、煙道部材等を腐食さ
せ、更にその腐食を防止するために空気予熱器出口ガス
にアンモニアを混入する場合には、硫安生成により煤塵
量が増加する等々の問題の原因となる。このようにＳＯ
3 の増加は設備面、運用面で致命的とも言えるものであ
る。The denitration device has a limited temperature condition from the viewpoint of maintaining the denitration performance of the catalyst, and is generally installed at the boiler outlet, or in some cases in the middle of the boiler. Therefore, the temperature of the gas passing through the denitration device changes depending on the operating conditions of the boiler. If the temperature of the passing gas rises for some reason, the SO 2 oxidation rate of the denitration device also rises and SO 3 increases. This SO 3 corrodes the heat transfer element of the air preheater, the electrode of the electrostatic precipitator, the flue member, and the like, and when ammonia is mixed into the air preheater outlet gas to prevent the corrosion, ammonium sulfate is used. The generation causes problems such as an increase in the amount of soot and dust. SO like this
The increase of 3 can be said to be fatal in terms of equipment and operation.
【０００４】前記のとおり、脱硝装置のＳＯ2 酸化作用
は通過ガス温度が上昇すると上昇する傾向にある。ボイ
ラで排ガス温度を下げるにはボイラの熱吸収量を増す必
要があるが、ボイラとしての必要熱吸収量は蒸気条件か
ら定まっているから、ボイラ側でのガス温度を低減する
のは限界がある。化石燃料を燃焼するボイラでは、燃料
中の灰分などによる伝熱面の汚れが避けられず、ボイラ
出口（脱硝装置入口）の燃焼排ガス温度もこれに伴い上
昇するから、脱硝装置におけるＳＯ2 酸化率も上昇す
る。したがって脱硝装置のＳＯ2 酸化率上昇を抑制する
には、脱硝装置入口ガス温度を低く保つ必要がある。As described above, the SO 2 oxidation function of the denitration device tends to increase as the passing gas temperature increases. In order to reduce the exhaust gas temperature in the boiler, it is necessary to increase the heat absorption amount of the boiler, but the required heat absorption amount of the boiler is determined by the steam conditions, so there is a limit to reducing the gas temperature on the boiler side. . In the boiler for burning fossil fuels, unavoidable dirt heat transfer surface due to ash in the fuel, because the combustion exhaust gas temperature of the boiler outlet (denitrator entrance) also rises Accordingly, SO 2 oxidation rate in denitrator Also rises. Therefore, in order to suppress an increase in the SO 2 oxidation rate of the denitration device, it is necessary to keep the denitration device inlet gas temperature low.
【０００５】[0005]
【課題を解決するための手段】本発明者は、前記従来の
課題を解決するために、節炭器を出たボイラ燃焼排ガス
を熱交換器に導入して温度を低下させた後、脱硝装置に
導入するようにしたことを特徴とするボイラ排ガス処理
装置を提案するものである。In order to solve the above-mentioned conventional problems, the inventor of the present invention introduced a boiler combustion exhaust gas from a economizer into a heat exchanger to lower the temperature, and then a denitration device. The present invention proposes a boiler exhaust gas treatment device characterized by being introduced into
【０００６】[0006]
【作用】本発明においては、ボイラ出口の節炭器と脱硝
装置の間に熱交換器を設け、ボイラ燃焼排ガスを冷却す
るので、脱硝触媒のＳＯ2 酸化作用が抑制されて、脱硝
装置の後流に配された機器の腐食が防止され、また煤塵
発生量が低減する。In the present invention, a heat exchanger is provided between the economizer at the outlet of the boiler and the denitration device to cool the boiler combustion exhaust gas, so that the SO 2 oxidizing action of the denitration catalyst is suppressed and the Corrosion of equipment placed in the stream is prevented, and the amount of dust generation is reduced.
【０００７】[0007]
【実施例】図１は本発明の第１実施例を示す系統図であ
る。本実施例は、ボイラの節炭器（１）と脱硝装置
（２）との間に熱交換器として第１の空気予熱器（４）
を設け、脱硝装置（２）の下流に第２の空気予熱器
（５）を配置した例である。このように、脱硝装置
（２）のガス流れ上流側にも熱交換器（４）を設けるこ
とにより、脱硝装置（２）入口のガス温度を、脱硝触媒
のＳＯ2 酸化率上昇が防止されるような適正範囲に、低
減・維持するものである。1 is a system diagram showing a first embodiment of the present invention. In this embodiment, a first air preheater (4) is provided as a heat exchanger between the boiler economizer (1) and the denitration device (2).
Is provided, and the second air preheater (5) is arranged downstream of the denitration device (2). Thus, by providing the heat exchanger (4) also on the upstream side of the gas flow of the denitration device (2), the gas temperature at the denitration device (2) inlet can be prevented from increasing the SO 2 oxidation rate of the denitration catalyst. It is intended to reduce and maintain such an appropriate range.
【０００８】熱交換器（４）としては、再生回転式空気
予熱器、鋼管式空気予熱器など、ボイラ排ガスと燃焼用
空気で熱交換するものの他、ボイラ排ガスで補助蒸気を
発生させるなど、形式や冷却媒体を問わない。The heat exchanger (4) is a regenerative rotary air preheater, a steel pipe air preheater or the like that exchanges heat between the boiler exhaust gas and the combustion air, or a type that generates auxiliary steam from the boiler exhaust gas. And any cooling medium.
【０００９】次に図２は本発明の第２実施例を示す系統
図である。前記第１実施例は、空気がまず第２の空気予
熱器（５）に入り、その後第１の空気予熱器（４）へ入
る、いわゆる直列方式であったが、本第２実施例は、第
１と第２の空気予熱器（４），（５）に空気を配分する
並列方式である。作用・効果は前記第１実施例と同様で
ある。Next, FIG. 2 is a system diagram showing a second embodiment of the present invention. In the first embodiment, the air first enters the second air preheater (5) and then enters the first air preheater (4), which is a so-called series method. This is a parallel system in which air is distributed to the first and second air preheaters (4) and (5). The operation and effect are similar to those of the first embodiment.
【００１０】[0010]
【発明の効果】本発明においては、ボイラ出口の節炭器
から脱硝装置までの間に熱交換器を設置し、脱硝装置入
口のボイラ排ガスを冷却することにより、脱硝触媒のＳ
Ｏ2 酸化作用を抑制することができる。その結果、脱硝
装置の後流に配置された機器・設備の低温腐食を軽減で
きる。According to the present invention, a heat exchanger is installed between the economizer at the outlet of the boiler and the denitration device, and the boiler exhaust gas at the inlet of the denitration device is cooled, so that the S of the denitration catalyst is reduced.
O 2 oxidation effect can be suppressed. As a result, it is possible to reduce low-temperature corrosion of equipment and facilities arranged downstream of the denitration device.
【００１１】電気集塵器では、電極の腐食防止のため、
入口でガス中へアンモニアを散布して、ＳＯ2 が酸化し
て生成したＳＯ3 と反応させて硫安としている。この硫
安はガス中に煤塵として存在するため、電気集塵器入口
の煤塵濃度はＳＯ3 濃度が高い程高くなるが、本発明に
よりＳＯ2 酸化作用が抑制されれば、ＳＯ3 濃度が低く
維持され、電気集塵器入口煤塵濃度が高くならず、した
がって過大な設備が不要となる。In the electrostatic precipitator, in order to prevent corrosion of the electrodes,
Ammonia is sparged into the gas at the inlet and reacted with SO 3 generated by the oxidation of SO 2 to give ammonium sulfate. Since this ammonium sulfate exists as soot in the gas, the soot concentration at the inlet of the electrostatic precipitator becomes higher as the SO 3 concentration becomes higher, but if the SO 2 oxidation effect is suppressed by the present invention, the SO 3 concentration is kept low. As a result, the dust concentration at the entrance of the electrostatic precipitator does not become high, and therefore, excessive equipment is unnecessary.
【００１２】電気集塵器入口でガス中にアンモニアを散
布しない場合には、ＳＯ3 が更に下流へ持ち越され、最
終的にはミスト状となって煙突から放出される。この場
合にも本発明によってＳＯ3 濃度を低く維持すれば、ミ
スト状ＳＯ3 量も低減できる。When ammonia is not sparged into the gas at the inlet of the electrostatic precipitator, SO 3 is carried further downstream, and is finally discharged from the chimney in the form of mist. Even in this case, if the SO 3 concentration is kept low by the present invention, the amount of mist-like SO 3 can also be reduced.
【図１】図１は本発明の第１実施例を示す系統図であ
る。FIG. 1 is a system diagram showing a first embodiment of the present invention.
【図２】図２は本発明の第２実施例を示す系統図であ
る。FIG. 2 is a system diagram showing a second embodiment of the present invention.
【図３】図３は従来のボイラにおける排ガス系統の一例
を示す図である。FIG. 3 is a diagram showing an example of an exhaust gas system in a conventional boiler.
（１） 節炭器 （２） 脱硝装置 （３） 空気予熱器 （４） 第１の空気予熱器 （５） 第２の空気予熱器 (1) Carbon economizer (2) DeNOx device (3) Air preheater (4) First air preheater (5) Second air preheater
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 6908−3Ｋ Ｆ２３Ｊ 15/00 Ｂ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Office reference number FI technical display location 6908-3K F23J 15/00 B
Claims (1)
器に導入して温度を低下させた後、脱硝装置に導入する
ようにしたことを特徴とするボイラ排ガス処理装置。1. A boiler exhaust gas treatment apparatus, characterized in that the boiler combustion exhaust gas leaving the economizer is introduced into a heat exchanger to lower the temperature and then introduced into a denitration device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6014350A JPH07213867A (en) | 1994-02-08 | 1994-02-08 | Boiler waste gas treating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6014350A JPH07213867A (en) | 1994-02-08 | 1994-02-08 | Boiler waste gas treating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07213867A true JPH07213867A (en) | 1995-08-15 |
Family
ID=11858625
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6014350A Pending JPH07213867A (en) | 1994-02-08 | 1994-02-08 | Boiler waste gas treating device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07213867A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006308269A (en) * | 2004-11-29 | 2006-11-09 | Mitsubishi Heavy Ind Ltd | Heat recovery equipment |
| CN102635869A (en) * | 2012-05-08 | 2012-08-15 | 上海锅炉厂有限公司 | Boiler with denitration device and boiler modification method |
| CN103443405A (en) * | 2011-03-04 | 2013-12-11 | 福斯特惠勒北美有限公司 | Method of and apparatus for selective catalytic NOx reduction in a power boiler |
| CN108592443A (en) * | 2018-04-16 | 2018-09-28 | 中冶南方工程技术有限公司 | Smoke absorption formula refrigeration system and its generating means |
-
1994
- 1994-02-08 JP JP6014350A patent/JPH07213867A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006308269A (en) * | 2004-11-29 | 2006-11-09 | Mitsubishi Heavy Ind Ltd | Heat recovery equipment |
| US8099959B2 (en) | 2004-11-29 | 2012-01-24 | Mitsubishi Heavy Industries, Ltd. | Heat recovery equipment |
| US8209985B2 (en) | 2004-11-29 | 2012-07-03 | Mitsubishi Heavy Industries, Ltd. | Heat recovery equipment |
| CN103443405A (en) * | 2011-03-04 | 2013-12-11 | 福斯特惠勒北美有限公司 | Method of and apparatus for selective catalytic NOx reduction in a power boiler |
| JP2014514134A (en) * | 2011-03-04 | 2014-06-19 | フォスター ホイーラ ノース アメリカ コーポレイション | Selective catalyst NOX reduction method and apparatus in power generation boiler |
| CN102635869A (en) * | 2012-05-08 | 2012-08-15 | 上海锅炉厂有限公司 | Boiler with denitration device and boiler modification method |
| CN108592443A (en) * | 2018-04-16 | 2018-09-28 | 中冶南方工程技术有限公司 | Smoke absorption formula refrigeration system and its generating means |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20031118 |