JPS629805B2 - - Google Patents
Info
- Publication number
- JPS629805B2 JPS629805B2 JP54036197A JP3619779A JPS629805B2 JP S629805 B2 JPS629805 B2 JP S629805B2 JP 54036197 A JP54036197 A JP 54036197A JP 3619779 A JP3619779 A JP 3619779A JP S629805 B2 JPS629805 B2 JP S629805B2
- Authority
- JP
- Japan
- Prior art keywords
- duct
- boiler
- flue
- exhaust gas
- air
- 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
Links
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
- Chimneys And Flues (AREA)
- Incineration Of Waste (AREA)
Description
【発明の詳細な説明】
この発明はボイラのダクト装置に係り、特にダ
クトの硫酸露点腐食を防止する装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a duct device for a boiler, and more particularly to a device for preventing sulfuric acid dew point corrosion of a duct.
最近原子力発電設備の拡充により、大型火力発
電設備が中間負荷火力として運用されることが多
くなつて来た。これに伴いボイラ設備の起動・停
止の回数が多くなつてきている。起動・停止の回
数が多くなることにより、必然的にボイラ諸設備
の各装置に熱衝撃を与える回数が多くなる。とり
わけ、空気予熱器と集塵器の間の煙道ではガス温
度が低いため、元来灰の付着、堆積が多く、起
動・停止による熱衝撃によりこの付着、堆積した
灰が剥離し、短時間に多量の灰が発生することに
なる。この煙道には集塵器が設置されているが、
上記の如き多量の灰が一時に発生すると、集塵器
の処理能力を超え、このため除塵されなかつて灰
が大気中に放出されることになる。この熱衝撃に
よる灰の発生の防止には、ボイラ停止時において
も、低温域である空気予熱器−集塵器間の煙道、
および集塵器−煙突間の煙道を加温しておくこと
が効果的である。この加温手段として、複数基の
ボイラが設置してある場合には、各ボイラの空気
予熱器−集塵器間の煙道をウオーミングダクトで
接続し、運転中のボイラダクトから排ガスを抽出
し、この排ガスをウオーミングダクトを介して運
転を停止したボイラの空気予熱器−集塵器間の煙
道に導入し加温する方法が行なわれている。しか
しこの方法によると次の如き問題が生ずる。例え
ば一基のボイラを点検のために停止した場合、停
止したボイラの煙道にボイラ排ガスが流入してい
るため、点検が不可能となることである。このた
め、ボイラを点検のため停止する場合を想定して
ウオーミングダクトにダンパを設け、点検中のボ
イラダクト内に排ガスが流入しないよう構成した
ものが提供された。しかしこのダンパを設けた型
式のものにおいてはさらに新たな問題が生じた。
ウオーミングダクトの各々のダンパを閉とするこ
とによりウオーミングダクト内に排ガスが滞留
し、この排ガスの温度が徐々に降下してゆく。こ
の結果ダクト内が露点以下の温度となると排ガス
中の水分が凝結し、さらに排ガス中のSO3がこの
凝結水に溶融して硫酸（H2SO4）となりいわゆる
硫酸露点腐食を起こす。このような問題は含塵亜
硫酸ガス又は亜硫酸ガスを含むガスの流れるダク
トについては共通する問題である。 With the recent expansion of nuclear power generation facilities, large thermal power generation facilities are increasingly being operated as intermediate load thermal power plants. As a result, the number of times boiler equipment is started and stopped is increasing. As the number of starts and stops increases, the number of times thermal shock is applied to each device of the boiler equipment inevitably increases. In particular, because the gas temperature is low in the flue between the air preheater and the dust collector, there is a lot of ash adhesion and accumulation, and the thermal shock caused by startup and shutdown causes this adhesion and accumulation of ash to peel off, resulting in a short period of time. A large amount of ash will be generated. A dust collector is installed in this flue, but
When such a large amount of ash is generated at once, it exceeds the processing capacity of the dust collector, and therefore, the ash that is not removed is released into the atmosphere. To prevent the generation of ash due to this thermal shock, even when the boiler is stopped, the flue between the air preheater and the dust collector, which is in the low temperature range,
It is also effective to heat the flue between the dust collector and the chimney. As this heating means, when multiple boilers are installed, the flue between the air preheater and dust collector of each boiler is connected with a warming duct, and the exhaust gas is extracted from the boiler duct in operation. A method is used in which this exhaust gas is introduced through a warming duct into a flue between an air preheater and a dust collector of a boiler whose operation has been stopped, and heated. However, this method causes the following problems. For example, when one boiler is stopped for inspection, the boiler exhaust gas flows into the flue of the stopped boiler, making the inspection impossible. For this reason, a damper has been provided in the warming duct to prevent exhaust gas from flowing into the boiler duct during inspection in case the boiler is stopped for inspection. However, a new problem arose with this type of damper.
By closing each damper of the warming duct, the exhaust gas stays in the warming duct, and the temperature of this exhaust gas gradually decreases. As a result, when the temperature inside the duct falls below the dew point, moisture in the exhaust gas condenses, and SO 3 in the exhaust gas melts into the condensed water to form sulfuric acid (H 2 SO 4 ), causing so-called sulfuric acid dew point corrosion. Such a problem is common to ducts through which dust-containing sulfur dioxide gas or gas containing sulfur dioxide gas flows.
この発明の目的は上記した従来技術の欠点を除
去し、ボイラ装置のダクト硫酸腐食を防止する装
置を提供することにある。 An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and to provide a device for preventing sulfuric acid corrosion in ducts of boiler equipment.
要するにこの発明は亜硫酸ガスを含むガス、特
にこれに加えてダスを含むガスの流れるダクトを
該ガスが流れないときはシールエアを該ガス中の
亜硫酸ガスの露点以上の温度の気体として供給
し、ガスパージし、ダクトの硫酸腐食を防止する
装置である。 In short, this invention supplies seal air as a gas with a temperature higher than the dew point of the sulfur dioxide gas in the duct when the gas does not flow through a duct through which a gas containing sulfur dioxide gas, particularly a gas containing dust in addition to the sulfur dioxide gas, is used for gas purge. This is a device that prevents sulfuric acid corrosion of ducts.
以下この発明の実施例を添付図面に基づいて説
明する。 Embodiments of the present invention will be described below based on the accompanying drawings.
第１図において、１および２は各ボイラであつ
て、これらボイラ１（第１のボイラ）および２
（第２のボイラ）には各々同様な空気供給風道お
よび排ガス煙道が設けてある。これをボイラ１を
例にとつて説明すると、押し込み通風機４（第１
の押込通風機）により供給された燃焼用空気は通
風機出口ダンパ１６を経て燃焼用空気供給風道７
（第１の風道）から空気予熱器３に至り、排ガス
と熱交換して加熱された後ボイラ１に流入する。
排ガスは前記空気予熱器３において燃焼用空気に
伝熱した後空気予熱器−集塵器間煙道１０（第１
の煙道）を経て集塵器５に至り除塵後煙突６から
大気中に放出される。前記ボイラ２もこのボイラ
１と同様に構成してある。これらボイラ１および
２の空気予熱器−集塵器間煙道１０および１０ａ
（第２の煙道）はダンパ１４および１４ａを介し
てウオーミングダクト１２により接続してある。
さらにこのウオーミングダクト１２と各ボイラの
燃焼用空気供給風道７（第１の風道）および７ａ
（第２の風道）はシールエアダクト１３および１
３ａにより接続してある。１５および１５ａはシ
ールエアダクト１３および１３ａに設けたダンパ
である。 In FIG. 1, 1 and 2 are boilers, and these boilers 1 (first boiler) and 2
(second boilers) are each provided with similar air supply ducts and exhaust gas flues. To explain this using boiler 1 as an example, forced draft fan 4 (first
The combustion air supplied by the forced draft fan) passes through the draft fan outlet damper 16 and then enters the combustion air supply air duct 7.
The air flows from the first air passage to the air preheater 3, where it is heated by exchanging heat with the exhaust gas, and then flows into the boiler 1.
The exhaust gas transfers heat to the combustion air in the air preheater 3, and then passes through the air preheater-dust collector flue 10 (first
It reaches the dust collector 5 through the chimney (flue) and is discharged into the atmosphere from the chimney 6 after dust removal. The boiler 2 is also constructed similarly to the boiler 1. Air preheater-dust collector flues 10 and 10a of these boilers 1 and 2
(second flue) is connected by a warming duct 12 via dampers 14 and 14a.
Furthermore, this warming duct 12 and each boiler's combustion air supply air duct 7 (first air duct) and 7a
(second air duct) is the seal air duct 13 and 1
3a. 15 and 15a are dampers provided in the seal air ducts 13 and 13a.
以上の構成の装置の作動状態を説明する。例え
ばボイラ２が点検のため停止している場合には、
ウオーミングダクト１２のダクト１４および１４
ａは閉となつてこの間に排ガスが滞留している。
この排ガスの滞留部に対してシールエアダクト１
３により燃焼用空気を強制的に圧入する。この場
合燃焼用空気は押込通風機４により高い圧力を保
つているため滞留排ガスを排除しこれと置換す
る。排除された排ガスは閉となつているダンパ１
４および１４ａの間隙から煙道１０，１０ａに排
出除去される。この場合、ダンパ１５と１４，お
よび１５ａと１４ａを各々連動させ、ダンパ１４
および１４ａが閉となつた場合には自動的にダン
パ１５および１５ａを開とするよう構成してもよ
い。 The operating state of the device having the above configuration will be explained. For example, if boiler 2 is stopped for inspection,
Ducts 14 and 14 of warming duct 12
A is closed and exhaust gas is retained during this time.
Seal air duct 1 is installed for this exhaust gas retention area.
3 forcibly injects combustion air. In this case, since the combustion air is maintained at a high pressure by the forced draft fan 4, the accumulated exhaust gas is removed and replaced with this. Damper 1, which is closed, removes the exhaust gas
It is discharged and removed from the gap between 4 and 14a into the flue 10, 10a. In this case, dampers 15 and 14 and dampers 15a and 14a are respectively linked, and damper 14
The dampers 15 and 15a may be automatically opened when the dampers 15 and 14a are closed.
この発明によれば亜硫酸ガスを含むダクトに滞
留した排ガスをシールエアにより排除し、代りに
シールエアを充填するので、そのダクトに硫酸露
点腐食が生じない。 According to this invention, the exhaust gas accumulated in the duct containing sulfur dioxide gas is removed by seal air and sealed air is filled instead, so that sulfuric acid dew point corrosion does not occur in the duct.
第１図はこの発明に係る装置を用いたボイラ装
置の系統図である。
１，２……ボイラ、３……空気予熱器、４……
押込通風機、７，７ａ……燃焼用空気供給風道、
１０，１０ａ……空気予熱器−集塵器間煙道、１
２……ウオーミングダクト、１３，１３ａ……シ
ールエアダクト、１４，１４ａ，１５，１５ａ…
…ダンパ。
FIG. 1 is a system diagram of a boiler apparatus using the apparatus according to the present invention. 1, 2... Boiler, 3... Air preheater, 4...
Forced draft fan, 7, 7a... Combustion air supply duct,
10, 10a...Air preheater-dust collector flue, 1
2... Warming duct, 13, 13a... Seal air duct, 14, 14a, 15, 15a...
…damper.
Claims (1)
を導く第１の煙道を有する第１のボイラ，燃焼用
空気を供給する第２の風道及び排ガスを導く第２
の煙道を有する第２のボイラ、前記第１及び第２
の風道に設けられている第１及び第２の押込通風
機、該第１及び第２の押込通風機後流側の前記第
１及び第２風道から夫々前記第２及び第１の煙道
に連通するダクト、及び該ダクトに設けられたダ
ンパからなることを特徴とするダクトの硫酸腐食
防止装置。1 A first boiler having a first wind duct that supplies combustion air and a first flue that guides exhaust gas, a second wind duct that supplies combustion air and a second flue that guides exhaust gas.
a second boiler having a flue of said first and second boilers;
first and second forced ventilation fans provided in the air ducts, and the second and first smoke from the first and second air ducts on the downstream side of the first and second forced ventilation fans, respectively. A sulfuric acid corrosion prevention device for a duct, comprising a duct communicating with a road and a damper provided in the duct.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3619779A JPS55128722A (en) | 1979-03-29 | 1979-03-29 | Sulfuric acid corrosion-proof device for warmer duct |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3619779A JPS55128722A (en) | 1979-03-29 | 1979-03-29 | Sulfuric acid corrosion-proof device for warmer duct |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55128722A JPS55128722A (en) | 1980-10-04 |
| JPS629805B2 true JPS629805B2 (en) | 1987-03-03 |
Family
ID=12462995
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3619779A Granted JPS55128722A (en) | 1979-03-29 | 1979-03-29 | Sulfuric acid corrosion-proof device for warmer duct |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55128722A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59147927A (en) * | 1983-02-12 | 1984-08-24 | Ebara Corp | Corrosion prevention of incineration facilities |
-
1979
- 1979-03-29 JP JP3619779A patent/JPS55128722A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS55128722A (en) | 1980-10-04 |
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