JPS6154462B2 - - Google Patents
Info
- Publication number
- JPS6154462B2 JPS6154462B2 JP1975582A JP1975582A JPS6154462B2 JP S6154462 B2 JPS6154462 B2 JP S6154462B2 JP 1975582 A JP1975582 A JP 1975582A JP 1975582 A JP1975582 A JP 1975582A JP S6154462 B2 JPS6154462 B2 JP S6154462B2
- Authority
- JP
- Japan
- Prior art keywords
- dust
- amount
- exhaust gas
- electrostatic precipitator
- exhaust
- 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
- 239000000428 dust Substances 0.000 claims description 66
- 238000006477 desulfuration reaction Methods 0.000 claims description 9
- 230000023556 desulfurization Effects 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 6
- 238000011144 upstream manufacturing Methods 0.000 claims description 2
- 239000012717 electrostatic precipitator Substances 0.000 description 17
- 238000005260 corrosion Methods 0.000 description 11
- 230000007797 corrosion Effects 0.000 description 11
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 10
- 239000003595 mist Substances 0.000 description 8
- 239000002245 particle Substances 0.000 description 5
- 238000003303 reheating Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 206010022000 influenza Diseases 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
Landscapes
- Filtering Of Dispersed Particles In Gases (AREA)
- Chimneys And Flues (AREA)
- Treating Waste Gases (AREA)
- Electrostatic Separation (AREA)
Description
【発明の詳細な説明】
本発明は、石炭焚ボイラ用等の排ガス処理シス
テムにおいて、その下流側機器の腐食の原因にな
つているSO3除去のための、該システムにおける
集塵装置の運転制御方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention is an exhaust gas treatment system for a coal-fired boiler, etc., in which operation control of a dust collector in the system is performed to remove SO 3 , which is a cause of corrosion in downstream equipment. It is about the method.
石炭焚ボイラ用の排ガス処理システムによつて
従来例を説明すると、第１図に示すように石炭焚
ボイラ１、脱硝装置２、空気予熱器３、電気集塵
装置４、フアンｆ、再加熱用ガス−ガスヒータ
５、脱硫装置６、煙突７によつて構成され、石炭
焚ボイラ１の排ガス中に存在するSO3は、通常、
空気予熱器３で大半が硫酸ミストとなりその大部
分が排ガス中のダストに付着して、空気予熱器３
の下流に配設されている電気集塵装置４で捕集さ
れるが、前記SO3の一部はガス状のままで電気集
塵装置４を通過する。その通過SO3は、フアンｆ
にて再加熱用ガス−ガスヒータ５で硫酸ミストに
なるけれども、電気集塵装置４の下流側であるた
め排気中の媒塵（ダスト）量が微量になつている
ため十分に媒塵に付着されないで残存する。 To explain a conventional example using an exhaust gas treatment system for a coal-fired boiler, as shown in Fig. 1, a coal-fired boiler 1, a denitrification device 2, an air preheater 3, an electrostatic precipitator 4, a fan The SO 3 present in the exhaust gas of the coal-fired boiler 1, which is composed of a gas-gas heater 5, a desulfurization device 6, and a chimney 7, is usually
Most of it becomes sulfuric acid mist in the air preheater 3, and most of it adheres to the dust in the exhaust gas, and the air preheater 3
However, a part of the SO 3 passes through the electrostatic precipitator 4 while remaining in a gaseous state. Its passing SO 3 is Juan f
Although the reheating gas is turned into sulfuric acid mist by the gas heater 5, the amount of dust in the exhaust gas is very small because it is on the downstream side of the electrostatic precipitator 4, so it is not sufficiently attached to the dust. remains.
従つて、前記の残存SO3ミストが再加熱用ガス
ーガスヒータ５あるいは脱硫装置６から煙突７に
到る煙道を著しく腐食させる原因になつている。 Therefore, the residual SO 3 mist causes significant corrosion of the flue leading from the reheating gas-gas heater 5 or the desulfurization device 6 to the chimney 7.
本発明は、従来の排ガス処理システムにおける
前記したような難点を解消するにあり、排ガス処
理システムにおいて、脱硫装置の上流側に配設さ
れている集塵装置の出側排気中の媒塵およびSO3
を検出し、同検出値に基づく媒塵量／SO3量が予
め設定された所定値範囲に入るよう前記集塵装置
の集塵性能を調節してその排出媒塵量を制御し、
前記排出媒塵に前記SO3を付着させて除去する点
に特徴を有し、その目的とする処は、排気中の媒
塵がSO3の付着剤としての役割をなすことに着目
し、集塵装置の性能を調整することによりSO3の
付着に必要な媒塵量を確保して、SO3の除去を可
能とした排ガス処理システムにおける集塵装置の
運転制御方法を供する点にある。 The present invention aims to solve the above-mentioned difficulties in conventional exhaust gas treatment systems. 3
and controlling the amount of discharged dust by adjusting the dust collection performance of the dust collector so that the amount of dust/SO 3 based on the detected value falls within a predetermined value range,
It is characterized by the fact that the SO 3 is removed by adhering to the exhaust dust, and its purpose is to focus on the fact that the dust in the exhaust acts as an adhesion agent for SO 3 , and to collect it. The object of the present invention is to provide a method for controlling the operation of a dust collector in an exhaust gas treatment system, which makes it possible to remove SO 3 by adjusting the performance of the dust device to ensure the amount of dust necessary for adhesion of SO 3 .
本発明は、前記した構成になつており、脱硫装
置の上流側に配設されている集塵装置の出側排気
中の媒塵およびSO3を検出し、同検出値に基づく
媒塵量／SO3量が予め設定された所定値範囲に入
るよう集塵装置の集塵性能を調節してその排出媒
塵量を制御しているので、集塵装置の出側排気中
のSO3量に応じそれの付着に必要な排出媒塵量が
確保されることになり、前記SO3が媒塵に付着さ
れ下流側の脱硫装置によつて除去される。従つ
て、集塵装置の下流側におけるSO3および媒塵が
十分に除去され下流側機器、煙道等における腐食
を防止することができる。 The present invention has the above-mentioned configuration, detects the dust and SO 3 in the outlet exhaust of the dust collector disposed upstream of the desulfurization equipment, and detects the amount of dust and SO 3 based on the detected value. Since the amount of exhaust media is controlled by adjusting the dust collection performance of the dust collector so that the amount of SO 3 falls within a preset value range, the amount of SO 3 in the exhaust air on the exit side of the dust collector is controlled. Accordingly, the amount of discharged dust necessary for the adhesion of the SO 3 is secured, and the SO 3 is adhered to the dust and removed by the desulfurization device on the downstream side. Therefore, SO 3 and dust particles on the downstream side of the dust collector can be sufficiently removed, and corrosion in downstream equipment, flues, etc. can be prevented.
以下、本発明の実施例を図面を参照して説明す
る。 Embodiments of the present invention will be described below with reference to the drawings.
第１図に示すような石炭焚ボイラ用の排ガス処
理システムにおける排気中のSO3は、通常次のよ
うな挙動をする。即ち、ボイラ燃焼過程で発生す
るSOXの主成分であるSO2は、ボイラ伝熱面ある
いは脱硝装置２の反応器でSO3に転換し、通常脱
硝装置２の出口の排気中に20〜30ppm存在す
る。このSO3は脱硝装置２の出口温度域（350〜
370℃程度）では大部分がガス状であるが、空気
予熱器３の中の低温部で冷されて大半が硫酸ミス
トとなり、その大部分が媒塵（ダスト）に付着し
空気予熱器３の下流側に設置された電気集塵装置
４が媒塵と一緒に捕集される。 SO 3 in the exhaust gas from an exhaust gas treatment system for a coal-fired boiler as shown in Figure 1 normally behaves as follows. That is, SO 2 , which is the main component of SO exist. This SO 3 is in the outlet temperature range of denitrification equipment 2 (350~
(about 370℃), most of it is in a gaseous state, but it is cooled in the low-temperature section of the air preheater 3 and most of it becomes sulfuric acid mist, and most of it adheres to the dust and is removed from the air preheater 3. An electrostatic precipitator 4 installed on the downstream side collects the dust together with the dust.
しかし、空気予熱器３の出口に存在する少量の
ガス状SO3は、電気集塵装置４では殆んど捕集さ
れずに通過して、下流側の再加熱用ガス−ガスヒ
ータ５に到達し、この際、そのガス状のSO3は再
加熱用ガス−ガスヒータ５内で冷却されて硫酸ミ
ストになる。この段階で存在する硫酸ミスト量は
通常少量であるが、空気予熱器３部と異なり、電
気集塵装置４による集塵後であるため、通常その
SO3が付着するための媒塵も微量になつている。
そのため、SO3ミストは媒塵に付着されないまま
で残存することになり、当然のことながら、この
残存SO3は再加熱用ガス−ガスヒータ５あるいは
それ以降のダクトにおける腐食の原因になつてい
る。 However, a small amount of gaseous SO 3 present at the outlet of the air preheater 3 passes through the electrostatic precipitator 4 without being collected and reaches the reheating gas-gas heater 5 on the downstream side. At this time, the gaseous SO 3 is cooled in the reheating gas-gas heater 5 and becomes sulfuric acid mist. The amount of sulfuric acid mist present at this stage is usually small, but unlike the air preheater 3, this is after the dust has been collected by the electrostatic precipitator 4.
The amount of dust that causes SO 3 to adhere is also small.
Therefore, the SO 3 mist remains without being attached to the dust, and as a matter of course, this residual SO 3 causes corrosion in the reheating gas-gas heater 5 or the duct after it.
また、第１図に示した石炭焚ボイラ用の排ガス
処理システム中におけるSO3は前記したような複
雑な挙動をなすとともに、そのSO3の発生量、形
態（ガス状、ミスト状）は燃料性状（石炭中の硫
黄分）、SO2→SO3転化率、ガス温度、媒塵濃度に
よつて大きく影響を受けて変化する。従つて、排
ガス処理システムにおいて、SO3による腐食防止
対策を考える場合には前記したような要因を考慮
し該システムを構成する各機器の特性を踏まえて
総合的に判断する必要がある。 Additionally, SO 3 in the exhaust gas treatment system for the coal-fired boiler shown in Figure 1 behaves in the complicated manner described above, and the amount and form (gaseous, mist) of SO 3 depend on the fuel properties. It is greatly influenced by (sulfur content in coal), SO 2 → SO 3 conversion rate, gas temperature, and dust concentration. Therefore, when considering measures to prevent corrosion due to SO 3 in an exhaust gas treatment system, it is necessary to take into account the above-mentioned factors and make a comprehensive judgment based on the characteristics of each device that constitutes the system.
よつて、本発明においては、前記したような排
ガス処理システム中におけるSO3の挙動および各
機器の特性を生かした総合判断により、排気中の
媒塵（ダスト）によるSO3付着剤としての役割、
電気集塵装置における集塵性能の調節容易性およ
び脱硫装置におけるダストに付着されたSO3除去
性能に着目して、それらの機能を有効に活用する
ことによつて電気集塵装置の下流側におけるSO3
を除去しそれによる腐食を防止するようにしたも
のである。 Therefore, in the present invention, based on a comprehensive judgment that takes into account the behavior of SO 3 in the exhaust gas treatment system as described above and the characteristics of each device, the role of SO 3 as an adhesive by dust in the exhaust gas,
By focusing on the ease of adjusting the dust collection performance of electrostatic precipitators and the ability to remove SO 3 attached to dust in desulfurization equipment, we will effectively utilize these functions to improve the SO 3
This is to prevent corrosion caused by the removal of .
具体的に説明すると、電気集塵装置４の下流側
におけるダクト等の材料腐食量と、電気集塵装置
４の出側排気中における媒塵量／SO3量との間に
は、第３図に示すような一定の関係があつて、
SO3量に対して媒塵量が大巾に少ない場合には材
料腐食量が極めて高いが、SO3量に対して媒塵量
が増加するに従つて材料腐食量が急激に低減し、
媒塵量／SO3量が10（mg/m3N/mg/m3N）程度にな
ると低く保たれて腐食防止効果が十分に得られる
ため、媒塵量／SO3量を少なくとも５〜10の範囲
に保つSO3量に対する媒塵量を確保する必要があ
る。 Specifically, there is a difference between the amount of corrosion of materials such as ducts on the downstream side of the electrostatic precipitator 4 and the amount of medium dust/SO 3 in the outlet exhaust of the electrostatic precipitator 4 as shown in Fig. 3. There is a certain relationship as shown in
When the amount of dust is significantly smaller than the amount of SO 3 , the amount of material corrosion is extremely high, but as the amount of dust increases relative to the amount of SO 3 , the amount of material corrosion decreases rapidly.
When the amount of dust/SO 3 is about 10 (mg/m 3 N/mg/m 3 N), it is kept low and a sufficient corrosion prevention effect can be obtained, so the amount of dust/SO 3 should be at least 5 to 5. It is necessary to secure the amount of dust for the amount of SO3 that is kept within the range of 10.
前記した電気集塵装置４の出側排気中における
適正な媒塵量確保手段としては、第２図に示すよ
うに電気集塵装置４の出側に配設した媒塵濃度お
よびSO3濃度計１０によつて、出側排気中の媒塵
濃度とSO3濃度とを検出し、その両検出値をフイ
ードバツク信号として電気集塵装置効率調節装置
のミニコンピユータ１３に発信し、ミニコンピユ
ータ１３では前記発信を受けて媒塵量／SO3量に
換算しかつ設定された所定値と比較して調節信号
を発し、各マイクロコンピユータ１４を介し電気
集塵装置４の各区劃毎に付設されている各電源装
置１５の荷電電流を制御するようになつており、
電気集塵装置４は前記荷電電流の制御によつて集
塵性能が変化し、SO3量に適応した媒塵量が自動
調節によつて排出されるようになる。即ち、電気
集塵装置４の出側排気中のSO3量が多い場合は、
それに応じて媒塵量も多くなるように制御され
て、媒塵量／SO3量が前記したような適量の所定
値範囲に入るように自動的に制御される。 As a means for ensuring an appropriate amount of dust in the exhaust gas on the outlet side of the electrostatic precipitator 4, as shown in FIG . 10 detects the dust concentration and SO 3 concentration in the outlet exhaust gas, and sends both detected values as feedback signals to the minicomputer 13 of the electrostatic precipitator efficiency adjustment device. In response to the transmission, it is converted into the amount of dust/SO 3 , compared with a predetermined value, and an adjustment signal is issued. It is designed to control the charging current of the power supply device 15,
The dust collecting performance of the electrostatic precipitator 4 is changed by controlling the charging current, and the amount of dust adapted to the amount of SO 3 is automatically adjusted to be discharged. That is, if the amount of SO 3 in the exhaust air on the outlet side of the electrostatic precipitator 4 is large,
The amount of dust particles is controlled to increase accordingly, and the amount of dust particles/SO 3 amount is automatically controlled to fall within the appropriate predetermined value range as described above.
従つて、前記したような電気集塵装置の運転制
御方法によれば、電気集塵装置４の出側排気中の
SO3量が付着するのに適量は媒塵量が該出側排気
中に存在されることになり、該SO3の殆んど全部
が該媒塵に付着され、かつ、下流側の脱硫装置６
における冷却塔、吸収塔で除去されるため、SO3
による腐食は第３図に示すように殆んど発生しな
い。 Therefore, according to the operation control method of the electrostatic precipitator 4 as described above, the exhaust gas on the outlet side of the electrostatic precipitator 4
An appropriate amount of dust is present in the outlet exhaust gas for the amount of SO 3 to adhere, and almost all of the SO 3 is attached to the dust and is removed from the downstream desulfurization equipment. 6
SO 3 is removed in cooling towers and absorption towers.
Almost no corrosion occurs as shown in Figure 3.
なお、前記した方法によればSO3量の増加に伴
つて媒塵量も増加されることになるが、SO3量自
体が少量であるため、その付着に要する媒塵量も
少量ですみ、この程度の媒塵量は下流側の脱硫装
置による集塵作用によつて十分に捕集可能であつ
て、煙突側の排ガス中の媒塵量増加は見られな
い。 In addition, according to the method described above, the amount of dust particles will increase as the amount of SO 3 increases, but since the amount of SO 3 itself is small, the amount of dust particles required for its attachment is also small. This amount of dust can be sufficiently collected by the dust collecting action of the desulfurization device on the downstream side, and no increase in the amount of dust in the exhaust gas on the chimney side is observed.
また、前記実施例では電気集塵装置による場合
について説明したが、他種の集塵装置によること
も可能である。 Furthermore, although the above embodiments have been described using an electrostatic precipitator, other types of dust collectors may also be used.
以上本発明を実施例について説明したが、勿論
本発明はこのような実施例にだけ局限されるもの
ではなく、本発明の精神を逸脱しない範囲内で
種々の設計の改変を施しうるものである。 Although the present invention has been described above with reference to embodiments, it goes without saying that the present invention is not limited to such embodiments, and that various design modifications can be made without departing from the spirit of the present invention. .
第１図は従来の排ガス処理システムの概要図、
第２図は本発明方法に用いられる集塵装置の集塵
性能調節機構図、第３図は腐食量と媒塵量／SO3
量との関係説明図である。
４：電気集塵装置、６：脱硫装置、１０：媒塵
濃度およびSO3濃度計、１３：ミニコンピユー
タ、１４：マイクロコンピユータ、１５：電源装
置。
Figure 1 is a schematic diagram of a conventional exhaust gas treatment system.
Figure 2 is a diagram of the dust collection performance adjustment mechanism of the dust collector used in the method of the present invention, and Figure 3 is the amount of corrosion and amount of dust/SO 3
It is an explanatory diagram of the relationship with quantity. 4: Electrostatic precipitator, 6: Desulfurization device, 10: Medium dust concentration and SO 3 concentration meter, 13: Mini computer, 14: Micro computer, 15: Power supply device.
Claims (1)
流側に配設されている集塵装置の出側排気中の媒
塵およびSO3を検出し、同検出値に基づく媒塵
量／SO3量が予め設定された所定値範囲に入るよ
う前記集塵装置の集塵性能を調節してその排出媒
塵量を制御し、前記排出媒塵に前記SO3を付着さ
せて除去することに特徴を有する排ガス処理シス
テムにおける集塵装置の運転制御方法。1 In the exhaust gas treatment system, the amount of dust and SO 3 in the outlet exhaust of the dust collector installed upstream of the desulfurization device is detected, and the amount of dust and SO 3 is preset based on the detected value. The exhaust gas treatment is characterized in that the dust collection performance of the dust collector is adjusted to fall within a predetermined value range, thereby controlling the amount of the discharged dust, and the SO 3 is attached to the discharged dust and removed. A method for controlling the operation of a dust collector in a system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57019755A JPS58137427A (en) | 1982-02-12 | 1982-02-12 | Method for controlling operation of dust collecting apparatus in exhaust gas treating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57019755A JPS58137427A (en) | 1982-02-12 | 1982-02-12 | Method for controlling operation of dust collecting apparatus in exhaust gas treating system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58137427A JPS58137427A (en) | 1983-08-15 |
| JPS6154462B2 true JPS6154462B2 (en) | 1986-11-22 |
Family
ID=12008157
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57019755A Granted JPS58137427A (en) | 1982-02-12 | 1982-02-12 | Method for controlling operation of dust collecting apparatus in exhaust gas treating system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58137427A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH112403A (en) * | 1997-06-11 | 1999-01-06 | Babcock Hitachi Kk | Boiler apparatus |
| CN1303278C (en) * | 2003-03-31 | 2007-03-07 | Lg电子株式会社 | Steam jet front load washing machine |
| CN1308529C (en) * | 2003-04-14 | 2007-04-04 | Lg电子株式会社 | Washing method for steam jet washing machine |
| WO2025253712A1 (en) * | 2024-06-05 | 2025-12-11 | 三菱重工業株式会社 | Exhaust gas treatment system, dust collection device, and method for controlling exhaust gas treatment system |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6668819B2 (en) * | 2016-02-29 | 2020-03-18 | 中国電力株式会社 | Coal-fired power plant |
-
1982
- 1982-02-12 JP JP57019755A patent/JPS58137427A/en active Granted
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH112403A (en) * | 1997-06-11 | 1999-01-06 | Babcock Hitachi Kk | Boiler apparatus |
| CN1303278C (en) * | 2003-03-31 | 2007-03-07 | Lg电子株式会社 | Steam jet front load washing machine |
| CN1308529C (en) * | 2003-04-14 | 2007-04-04 | Lg电子株式会社 | Washing method for steam jet washing machine |
| WO2025253712A1 (en) * | 2024-06-05 | 2025-12-11 | 三菱重工業株式会社 | Exhaust gas treatment system, dust collection device, and method for controlling exhaust gas treatment system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58137427A (en) | 1983-08-15 |
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