JPH0459559B2 - - Google Patents
Info
- Publication number
- JPH0459559B2 JPH0459559B2 JP3305585A JP3305585A JPH0459559B2 JP H0459559 B2 JPH0459559 B2 JP H0459559B2 JP 3305585 A JP3305585 A JP 3305585A JP 3305585 A JP3305585 A JP 3305585A JP H0459559 B2 JPH0459559 B2 JP H0459559B2
- Authority
- JP
- Japan
- Prior art keywords
- temperature section
- medium
- air preheater
- high temperature
- ammonium sulfate
- 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
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 2
- 230000008929 regeneration Effects 0.000 claims 1
- 238000011069 regeneration method Methods 0.000 claims 1
- -1 sulfuric acid compound Chemical class 0.000 claims 1
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 16
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 15
- 235000011130 ammonium sulphate Nutrition 0.000 description 15
- 230000002378 acidificating effect Effects 0.000 description 13
- 239000007789 gas Substances 0.000 description 11
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 6
- 230000001172 regenerating effect Effects 0.000 description 6
- 229910021529 ammonia Inorganic materials 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Landscapes
- Air Supply (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の改良に関す
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３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 3 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 produced at around 150-240℃ and has strong adhesive force.
第４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 4 shows a temperature diagram at the boiler outlet, and since air preheaters are normally operated at an inlet gas temperature of 350 to 400°C and an outlet gas temperature of 130 to 150°C, the above-mentioned acidic ammonium sulfate generation region will pass through. 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 the boiler to evaporate. The plant becomes unable to operate continuously. This necessitates shutting down the unit and cleaning the air preheater to remove deposits.
It has become a very serious problem.
（発明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
題点である。そしてさらに具体的に述べれば、従
来の再生回転式空気予熱器１２は第５図に示す様
にガス流れ上流側より高温部エレメント９、中温
部エレメント１０、低温部エレメント１１から構
成されている。空気予熱器１２は、本体外側面部
に駆動外輪として歯車１３が装備されている。歯
車１３には駆動装置１４が設置されている。図に
示すように、空気予熱器１２全体を１ケの駆動機
構で動作させているため、酸性硫安発生域に当る
中温部エレメント１０の温度をコントロールでき
ない難点がある。(Problems to be Solved by the Invention) The problems to be solved by the present invention are as described above. More specifically, the conventional regenerative rotary air preheater 12 is comprised of a high temperature section element 9, a medium temperature section element 10, and a low temperature section element 11 from the upstream side of the gas flow, as shown in FIG. The air preheater 12 is equipped with a gear 13 as a driving outer wheel on the outer surface of the main body. A drive device 14 is installed on the gear 13. As shown in the figure, since the entire air preheater 12 is operated by one drive mechanism, there is a drawback that the temperature of the medium temperature element 10, which corresponds to the area where acidic ammonium sulfate is generated, cannot be controlled.
本発明はかかる問題点の解消を目的とするもの
であり、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可能とする再生回転式
空気予熱器を得ることを目的とするものである。 The present invention aims to solve these problems, and boilers equipped with denitrification equipment, which are desired to operate continuously due to their high economic efficiency and low pollution, are forced to stop frequently due to blockage of the air preheater by acidic ammonium sulfate. The purpose is to obtain a regenerative rotary air preheater that makes it possible to improve the situation in which
（問題点を解決するための手段）
かかる目的に対し本発明は、高温部と中低温部
との回転速度に差を与え、かつ高温部のエレメン
トの１部を除去してなり、中・低温部エレメント
に部分的に高温ガスを流すことにより中温部又は
低温部に付着した硫酸化合物を除去することを特
徴とする再生回転式空気予熱器を供するものであ
る。(Means for Solving the Problems) To achieve this purpose, the present invention provides a difference in rotational speed between the high temperature section and the medium and low temperature section, and also removes a part of the element in the high temperature section. The present invention provides a regenerative rotary air preheater characterized in that sulfuric acid compounds adhering to a medium-temperature section or a low-temperature section are removed by partially flowing high-temperature gas through the section element.
（実施例）
以下、本発明の実施例を第１図および第２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矢視図である。９は空気予熱器・高温部エ
レメント、１０は中温部エレメント、１１は低温
部エレメントを示す。空気予熱器１２は、高温部
９と中低温部１０，１１とに駆動機構が分れてい
る。高温部９には歯車１３、駆動装置１４が装備
されている。中・低温部１０，１１にも同様に歯
車１５、駆動装置１６が装備されている。一方、
空気予熱器１２の高温部９は、エレメント１７が
一部取外してある。１８は高温部の荷重を支える
ベアリング、１９は高温部と中・低温部とが回転
差をもつため、その境界部の気密を保つためのシ
ールである。(Example) Hereinafter, an example of the present invention will be shown in FIG. 1 and FIG. 2, and its structure and operation will be explained. FIG. 2 is a view taken along the line A--A in FIG. 1. Reference numeral 9 indicates an air preheater/high temperature section element, 10 indicates an intermediate temperature section element, and 11 indicates a low temperature section element. The air preheater 12 has a drive mechanism divided into a high temperature section 9 and medium and low temperature sections 10 and 11. The high temperature section 9 is equipped with a gear 13 and a drive device 14. Similarly, the medium and low temperature sections 10 and 11 are equipped with a gear 15 and a drive device 16. on the other hand,
In the high temperature section 9 of the air preheater 12, the element 17 is partially removed. 18 is a bearing that supports the load of the high temperature section, and 19 is a seal that maintains airtightness at the boundary between the high temperature section and the medium/low temperature section since there is a rotation difference between the high temperature section and the medium/low temperature section.
かかる構成により、空気予熱器１２の高温部９
の駆動装置１４と、中・低温部１０，１１の駆動
装置１６は回転速度が変えられるようになつてい
る。従つて、酸性硫安発生域に当る中温部エレメ
ント１０に高温ガスをバイパスさせることにより
中温部エレメントを通過する流速が上がり、又、
酸性硫安発生域の中温部エレメント１０の温度が
上昇することによる温度差の相乗作用により酸性
硫安の付着を防止することができる。高温部９と
中・低温部１０，１１の回転速度に差が設けてあ
るため高温ガスは適当な時間インタバルでまんべ
んなく中・低温部を加熱し、付着した酸性硫安を
離脱・除去せしめる。なお高温部エレメントの１
部１７は除いてあるため、その分伝熱面積として
は減るが、その割合は最小に止めてあるため全体
の伝熱効率の低下は最小に抑えることができる。 With this configuration, the high temperature section 9 of the air preheater 12
The rotational speed of the drive device 14 and the drive device 16 of the medium/low temperature sections 10 and 11 can be changed. Therefore, by bypassing the high temperature gas to the medium temperature element 10, which corresponds to the area where acidic ammonium sulfate is generated, the flow rate passing through the medium temperature element increases, and
Adhesion of acidic ammonium sulfate can be prevented by the synergistic effect of the temperature difference caused by the rise in the temperature of the intermediate temperature element 10 in the acidic ammonium sulfate generation area. Since there is a difference in rotational speed between the high temperature section 9 and the medium and low temperature sections 10 and 11, the high temperature gas evenly heats the medium and low temperature sections at appropriate time intervals to separate and remove the attached acidic ammonium sulfate. Note that 1 of the high temperature element
Since the portion 17 is removed, the heat transfer area is reduced accordingly, but since the proportion thereof is kept to a minimum, the decrease in the overall heat transfer efficiency can be suppressed to a minimum.
（発明の効果）
以上説明したごとく、本発明装置は、空気予熱
器中に酸性硫安が付着しにくく、かつ万一付着し
ても容易に除去可能とした点、即ち酸性硫安の付
着部に高温ガスを流し付着物を離脱除去し、なお
かつ全体の熱交換効率の低下を最小に抑えること
ができるものである。そして本発明の効果は、上
述の中温部に付着する酸性硫安のみならず低温部
に付着する硫安に対しても同様な効果を有する。(Effects of the Invention) As explained above, the device of the present invention makes it difficult for acidic ammonium sulfate to adhere to the air preheater, and even if it does adhere, it can be easily removed. It is possible to remove deposits by flowing gas, and to minimize the decrease in overall heat exchange efficiency. The effect of the present invention has the same effect not only on acidic ammonium sulfate adhering to the above-mentioned medium temperature section but also on ammonium sulfate adhering to the low temperature section.
第１図は本発明の再生回転式空気予熱器の説明
図、第２図は、第１図のＡ−Ａ矢視図、第３図は
ボイラプラントの系統図、第４図はボイラ出口の
温度線図、第５図は従来の再生回転式空気予熱器
の説明図である。
９……空気予熱器高温部エレメント、１０……
同中温部エレメント、１１……同低温部エレメン
ト、１２……空気予熱器、１４，１６……駆動装
置。
Fig. 1 is an explanatory diagram of the regenerative rotary air preheater of the present invention, Fig. 2 is a view taken along the line A-A in Fig. 1, Fig. 3 is a system diagram of the boiler plant, and Fig. 4 is a diagram of the boiler outlet. The temperature diagram in FIG. 5 is an explanatory diagram of a conventional regenerative rotary air preheater. 9... Air preheater high temperature section element, 10...
Medium temperature section element, 11... Low temperature section element, 12... Air preheater, 14, 16... Drive device.
Claims (1)
かつ、高温部のエレメントの１部を除去してな
り、中・低温部エレメントに部分的に高温ガスを
流すことにより中温部又は低温部に付着した硫酸
化合物を除去することを特徴とする再生回転式空
気予熱器。1 Give a difference in the rotational speed between the high temperature section and the medium and low temperature section,
and a regeneration rotation characterized in that a part of the element in the high temperature section is removed, and the sulfuric acid compound adhering to the medium temperature section or the low temperature section is removed by partially flowing high temperature gas through the medium and low temperature section elements. Type air preheater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3305585A JPS61191899A (en) | 1985-02-21 | 1985-02-21 | Regenerative rotary type air preheater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3305585A JPS61191899A (en) | 1985-02-21 | 1985-02-21 | Regenerative rotary type air preheater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61191899A JPS61191899A (en) | 1986-08-26 |
| JPH0459559B2 true JPH0459559B2 (en) | 1992-09-22 |
Family
ID=12376072
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3305585A Granted JPS61191899A (en) | 1985-02-21 | 1985-02-21 | Regenerative rotary type air preheater |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61191899A (en) |
-
1985
- 1985-02-21 JP JP3305585A patent/JPS61191899A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61191899A (en) | 1986-08-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6264905B1 (en) | Method and apparatus for reducing “ammonia slip” in SCR and/or SNCR NOX removal applications | |
| CA2498263C (en) | Exhaust smoke-processing system | |
| US20040253158A1 (en) | Method for removing mercury in exhaust gas and system therefor | |
| US20050180905A1 (en) | Multi-stage heat absorbing reactor and process for SCR of NOx and for oxidation of elemental mercury | |
| CN104033921B (en) | A kind of device and method preventing ammonium hydrogen sulfate from blocking coal-burning boiler air preheater | |
| JPS5824174B2 (en) | Exhaust gas treatment method | |
| CN108159876B (en) | A kind of processing device, method and use of sintering flue gas | |
| JP2011017524A (en) | Method for cleaning air preheater in operating state | |
| US20240390838A1 (en) | A system for reducing ammonium bisulfate blockage in air preheaters of coal-fired power plants | |
| JPH0459559B2 (en) | ||
| JP3572139B2 (en) | Heat exchanger and flue gas treatment device provided with the same | |
| JP2003517562A (en) | Rotary regenerative air preheater rotor | |
| JPH0459558B2 (en) | ||
| JPS61195293A (en) | Regenerative rotary type air preheater | |
| JPS61195295A (en) | Regenerative rotary type air preheater with dust removing function | |
| JPS61191898A (en) | Structure of soot blower for regenerative rotary type air preheater | |
| CN112628792B (en) | Separation type air preheating system for preventing ABS (anti-lock brake System) of air preheater from being blocked and operation method | |
| JPS61195291A (en) | Regenerative rotary type air preheater | |
| JPS61191900A (en) | Regenerative rotary type air preheater | |
| JPS61195297A (en) | Regenerative rotary type air preheater | |
| JPS61195294A (en) | Regenerative rotary type air preheater | |
| CN108413438B (en) | Self-cleaning horizontal tubular air preheater | |
| JPH0148809B2 (en) | ||
| JP2548499Y2 (en) | Exhaust gas purification device for internal combustion engine | |
| JPS61195298A (en) | Regenerative rotary type air preheater |