JPH0459558B2 - - Google Patents
Info
- Publication number
- JPH0459558B2 JPH0459558B2 JP3385085A JP3385085A JPH0459558B2 JP H0459558 B2 JPH0459558 B2 JP H0459558B2 JP 3385085 A JP3385085 A JP 3385085A JP 3385085 A JP3385085 A JP 3385085A JP H0459558 B2 JPH0459558 B2 JP H0459558B2
- Authority
- JP
- Japan
- Prior art keywords
- air preheater
- ammonium sulfate
- temperature
- acidic ammonium
- temperature element
- 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
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 claims description 13
- 229910052921 ammonium sulfate Inorganic materials 0.000 claims description 12
- 235000011130 ammonium sulphate Nutrition 0.000 claims description 12
- 230000002378 acidificating effect Effects 0.000 claims description 11
- 238000004140 cleaning Methods 0.000 claims description 9
- 230000001172 regenerating effect Effects 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 8
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 8
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 229910021529 ammonia Inorganic materials 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 1
- -1 sulfuric acid compound Chemical class 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G9/00—Cleaning by flushing or washing, e.g. with chemical solvents
- F28G9/005—Cleaning by flushing or washing, e.g. with chemical solvents of regenerative heat exchanger
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Air Supply (AREA)
- Treating Waste Gases (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は再生回転式空気予熱器に係る改良に関
する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to improvements in regenerative rotary air preheaters.
（従来の技術）
近年公害規制はますます厳しくなり、窒素酸化
物（NOx）の低減のため脱硝装置を設置したボ
イラが急速に増えており、特に大容量の石炭焚ボ
イラでは脱硝装置は不可欠といつても過言ではな
い。ところが脱硝装置ではアンモニア（NH3）
を使用するため、未反応のアンモニアが排ガス中
のSO3と反応して、いわゆる酸性硫安（NH4
HSO4）を形成し、これが下流側にある空気予熱
器にて深刻な閉塞を起し、ボイラプラントが運転
継続不能となる事態が起つている。(Conventional technology) In recent years, pollution regulations have become increasingly strict, and the number of boilers equipped with denitrification equipment to reduce nitrogen oxides (NOx) is rapidly increasing.Denitrification equipment is especially essential for large-capacity coal-fired boilers. It's always no exaggeration. However, in the denitration equipment, ammonia (NH 3 )
Because of this, unreacted ammonia reacts with SO 3 in the exhaust gas to form so-called acidic ammonium sulfate (NH 4
HSO 4 ) is formed, which causes a serious blockage in the downstream air preheater, making it impossible for the boiler plant to continue operating.
第４図にボイラプラントの系統図を示す。１は
ボイラ、２は脱硝装置、３は空気予熱器、４は集
塵器、５は脱硫装置、６，７は送風機、８は煙突
である。集塵器４はボイラ１と脱硝装置２の間に
設置されるケースもあるが基本的問題は同じであ
る。脱硝装置２の前でアンモニアNH3が注入さ
れ、次のような反応によつて排ガス中の窒素酸化
物を低減する。 Figure 4 shows a system diagram of the boiler plant. 1 is a boiler, 2 is a denitrification device, 3 is an air preheater, 4 is a dust collector, 5 is a desulfurization device, 6 and 7 are blowers, and 8 is a chimney. In some cases, the dust collector 4 is installed between the boiler 1 and the denitrification device 2, but the basic problem is the same. Ammonia NH 3 is injected in front of the denitrification device 2, and nitrogen oxides in the exhaust gas are reduced through the following reaction.
4NO＋4NH3＋O2→4N2＋6H2Ｏ
2NO2＋4NH3＋O2→3N2＋6H2Ｏ
しかしながら注入したNH3の一部が未反応で残
り、これが排ガス中のSO3と反応して次のような
硫安化合物を生成する。 4NO+4NH 3 +O 2 →4N 2 +6H 2 O 2NO 2 +4NH 3 +O 2 →3N 2 +6H 2 O However, some of the injected NH 3 remains unreacted, and this reacts with SO 3 in the exhaust gas to form the following: Produces ammonium sulfate compounds.
NH3＋H2Ｏ＋SO3→NH4HSO4（酸性硫安）
NH4HSO4＋NH3→（NH4）2SO4（硫安）
このうち酸性硫安（NH4HSO4）は通常温度域
150〜240℃付近にて生成し、強い付着力を有して
いる。 NH 3 +H 2 O + SO 3 →NH 4 HSO 4 (acidic ammonium sulfate) NH 4 HSO 4 +NH 3 → (NH 4 ) 2 SO 4 (ammonium sulfate) Of these, acidic ammonium sulfate (NH 4 HSO 4 ) is in the normal temperature range
It is generated around 150-240℃ and has strong adhesive force.
第５図にボイラ出口の温度線図を示すが、空気
予熱器は通常入口ガス温度350〜400℃出口ガス温
度130〜150℃程度で運転されるためまず例外なく
上記酸性硫安の生成域を通過することになる。こ
のため酸性硫安が空気予熱器の中に付着し、更に
排ガス中のダストを捕足したりして、非常に粘着
力のある付着物が生成し、ついには伝熱面の閉塞
を起してボイラプラントが連続運転不能となる。
このためユニツトを停止し、空気予熱器を洗浄し
て付着物を除去することが必要となり、非常に深
刻な問題となつている。 Figure 5 shows the temperature diagram at the boiler outlet. Since the air preheater is normally operated at an inlet gas temperature of 350 to 400 degrees Celsius and an outlet gas temperature of 130 to 150 degrees Celsius, the air preheater passes through the above acidic ammonium sulfate generation region without exception. I will do it. As a result, acidic ammonium sulfate adheres to the inside of the air preheater, and also traps dust in the exhaust gas, forming extremely sticky deposits that eventually clog the heat transfer surface and cause boiler damage. The plant becomes unable to operate continuously.
This necessitates shutting down the unit and cleaning the air preheater to remove deposits, which is a very serious problem.
（考案が解決しようとする問題点）
本発明が解決しようとするのは上記のごとき問
題点であり、また本発明は、高い経済性と低公害
性により連続運転が望まれる脱硝装置付のボイラ
が酸性硫安による空気予熱器閉塞のため頻繁に停
止を余儀なくされている状態を改善することを目
的とするものである。（問題点を解決しようとす
る手段）
本発明は、かかる目的に対し、再生回転式空気
予熱器の酸性硫安付着域である中温エレメントを
セクター構造とし容易に空気予熱器外へ取出せる
構造とし、付着物を有する中温エレメントを空気
予熱器外へ引出してこれを専用の洗浄装置を用い
て付着物を除去すると共に下流側低温エレメント
の加熱による付着物除去を行う空気予熱器洗浄装
置を供するものである。(Problems to be Solved by the Invention) The present invention aims to solve the above-mentioned problems, and the present invention also provides a boiler equipped with a denitrification device that is desired to be operated continuously due to its high economic efficiency and low pollution. The purpose is to improve the situation where the air preheater is frequently forced to shut down due to blockage of the air preheater due to acidic ammonium sulfate. (Means for Solving the Problems) To achieve this objective, the present invention provides a structure in which the intermediate temperature element, which is the acidic ammonium sulfate deposition area of the regenerative rotary air preheater, has a sector structure so that it can be easily taken out of the air preheater. This equipment provides an air preheater cleaning device that removes the deposits by pulling out the intermediate temperature element having deposits outside the air preheater and removing the deposits using a dedicated cleaning device, and also by heating the downstream low temperature element. be.
（実施例）
以下、本発明の１実施例を第１図ないし第３図
に示し、その構成、作用を説明する。第２図は第
１図のＡ−Ａ矢視図、第３図は第１図のＢ部詳細
図である。１０は空気予熱器本体（以下AHと略
記する）、１１は酸性硫安の付着する中温層エレ
メントである。中温層エレメントは放射状のセク
ター方式とし簡単にAH外に引き出せる構造とな
つている。中温層エレメント１１は駆動機１４に
よつて、引出用ガイドレール１３の上を滑りなが
ら、AH外へ引出される。エレメントがAH外へ
引出されるとシールカバー１２が閉じてAHの気
密を保つようになつている。引出された中温エレ
メントは噴射ポンプ１５により加圧された温水が
噴射ノズル１６によつて噴射され、エレメント上
に付着又は閉塞している酸性硫安を洗浄除去す
る。洗浄水は排水パイプ１７にて受け、配管を通
して排水ポンプ２０により処理槽迄移送する。洗
浄装置の詳細を第３図に示すが１８はレールプレ
ート、１９はシールリングでいずれも洗浄水が
AH廻りに飛散汚染することを防止するためのも
のである。(Embodiment) Hereinafter, one embodiment of the present invention is shown in FIGS. 1 to 3, and its structure and operation will be explained. 2 is a view taken along the line A--A in FIG. 1, and FIG. 3 is a detailed view of section B in FIG. 1. 10 is an air preheater main body (hereinafter abbreviated as AH), and 11 is a medium temperature layer element to which acidic ammonium sulfate is attached. The mid-temperature layer element has a radial sector type structure that allows it to be easily pulled out of the AH. The middle temperature layer element 11 is pulled out of the AH by the driving machine 14 while sliding on the pull-out guide rail 13. When the element is pulled out of the AH, the seal cover 12 is closed to keep the AH airtight. Hot water pressurized by the injection pump 15 is injected through the injection nozzle 16 to the drawn out medium-temperature element to wash and remove acidic ammonium sulfate adhering to or clogging the element. Washing water is received by a drain pipe 17 and transferred to a treatment tank by a drain pump 20 through the pipe. The details of the cleaning device are shown in Figure 3, where 18 is a rail plate and 19 is a seal ring, both of which are supplied with cleaning water.
This is to prevent scattering contamination around the AH.
（発明の効果）
以上説明したごとく、従来AHに付着した酸性
硫安を除去するには、AHを停止してガス温度を
150℃付近迄冷却してから洗浄していたため、数
日間の停止期間が必要であつたが本発明による
と、運転中でも（引出し中極く短時間AHの回転
を停止）中温エレメントのみを引出して、しかも
付着状況を目視確認しながら行うことが出来るた
め確実な洗浄・除去が行える。なお中温エレメン
トの引抜いたセクターの下流側にある低温エレメ
ントは高温ガスで乾燥されることになるため、低
温エレメントに硫酸化合物が付着していた場合は
この除去効果も併せ有する。(Effects of the invention) As explained above, in order to remove acidic ammonium sulfate attached to AH, the AH must be stopped and the gas temperature lowered.
Since cleaning was performed after cooling to around 150°C, a shutdown period of several days was required, but according to the present invention, only the medium temperature element can be pulled out even during operation (the rotation of the AH is stopped for a very short period of time during extraction). Furthermore, since the adhesion status can be visually checked, cleaning and removal can be carried out reliably. Note that since the low-temperature element located downstream of the sector from which the medium-temperature element has been pulled out will be dried with high-temperature gas, if a sulfuric acid compound has adhered to the low-temperature element, this also has the effect of removing it.
第１図は本発明の１実施例の説明図、第２図は
第１図のＡ−Ａ矢視図、第３図は第１図のＢ部詳
細図、第４図はボイラプラントの系統図、第５図
はボイラ出口の温度線図である。
１０……空気予熱器本体、１１……中温層エレ
メント、１２……シールカバー、１３……ガイド
レール、１４……駆動機、１５……噴射ポンプ、
１６……噴射ノズル、１７……排水パイプ。
Fig. 1 is an explanatory diagram of one embodiment of the present invention, Fig. 2 is a view taken along the line A-A in Fig. 1, Fig. 3 is a detailed view of section B in Fig. 1, and Fig. 4 is a system of a boiler plant. Figure 5 is a temperature diagram at the boiler outlet. 10... Air preheater main body, 11... Middle temperature layer element, 12... Seal cover, 13... Guide rail, 14... Drive machine, 15... Injection pump,
16...Injection nozzle, 17...Drainage pipe.
Claims (1)
る中温エレメントをセクター構造とし容易に空気
予熱器外へ取出せる構造とし、付着物を有する中
温エレメントを空気予熱器外へ引出して、これを
専用の洗浄装置を用いて付着物を除去すると共に
下流側低温エレメントの加熱による付着物除去を
行う空気予熱器洗浄装置。1 The medium-temperature element, which is the area where acidic ammonium sulfate is deposited in the regenerative rotary air preheater, has a sector structure so that it can be easily taken out of the air preheater. An air preheater cleaning device that uses a cleaning device to remove deposits and also removes deposits by heating a downstream low-temperature element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3385085A JPS61195296A (en) | 1985-02-22 | 1985-02-22 | Device for cleaning air preheater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3385085A JPS61195296A (en) | 1985-02-22 | 1985-02-22 | Device for cleaning air preheater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61195296A JPS61195296A (en) | 1986-08-29 |
| JPH0459558B2 true JPH0459558B2 (en) | 1992-09-22 |
Family
ID=12397976
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3385085A Granted JPS61195296A (en) | 1985-02-22 | 1985-02-22 | Device for cleaning air preheater |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61195296A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2700860B2 (en) * | 1994-06-13 | 1998-01-21 | 廉正 赤澤 | Air conditioner cleaning method and its cleaning device |
| JP2009168357A (en) * | 2008-01-17 | 2009-07-30 | Chugoku Electric Power Co Inc:The | Attachment washing method and washing apparatus for air preheater |
| JP5025685B2 (en) * | 2009-05-25 | 2012-09-12 | 中国電力株式会社 | Cleaning confirmation method |
| US9587894B2 (en) | 2014-01-13 | 2017-03-07 | General Electric Technology Gmbh | Heat exchanger effluent collector |
-
1985
- 1985-02-22 JP JP3385085A patent/JPS61195296A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61195296A (en) | 1986-08-29 |
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