JP2002326015A - Exhaust gas treatment method and apparatus - Google Patents
Exhaust gas treatment method and apparatusInfo
- Publication number
- JP2002326015A JP2002326015A JP2001136168A JP2001136168A JP2002326015A JP 2002326015 A JP2002326015 A JP 2002326015A JP 2001136168 A JP2001136168 A JP 2001136168A JP 2001136168 A JP2001136168 A JP 2001136168A JP 2002326015 A JP2002326015 A JP 2002326015A
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- ammonia
- temperature
- cooling
- dust
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 13
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 69
- 239000000428 dust Substances 0.000 claims abstract description 45
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 33
- 238000001816 cooling Methods 0.000 claims abstract description 29
- AKEJUJNQAAGONA-UHFFFAOYSA-N sulfur trioxide Chemical compound O=S(=O)=O AKEJUJNQAAGONA-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000002253 acid Substances 0.000 claims abstract description 15
- 238000002347 injection Methods 0.000 claims abstract description 13
- 239000007924 injection Substances 0.000 claims abstract description 13
- 239000007789 gas Substances 0.000 claims description 84
- 239000002912 waste gas Substances 0.000 claims 1
- 150000001875 compounds Chemical class 0.000 abstract description 8
- 239000012718 dry electrostatic precipitator Substances 0.000 abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 12
- 239000002245 particle Substances 0.000 description 10
- 239000007921 spray Substances 0.000 description 9
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 8
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 8
- 235000011130 ammonium sulphate Nutrition 0.000 description 8
- 238000002485 combustion reaction Methods 0.000 description 5
- 239000012717 electrostatic precipitator Substances 0.000 description 5
- 239000012716 precipitator Substances 0.000 description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000002378 acidificating effect Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000000295 fuel oil Substances 0.000 description 2
- 239000003595 mist Substances 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 239000002006 petroleum coke Substances 0.000 description 2
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical class S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 2
- 229910052815 sulfur oxide Inorganic materials 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 101100219325 Phaseolus vulgaris BA13 gene Proteins 0.000 description 1
- BIGPRXCJEDHCLP-UHFFFAOYSA-N ammonium bisulfate Chemical compound [NH4+].OS([O-])(=O)=O BIGPRXCJEDHCLP-UHFFFAOYSA-N 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 235000011116 calcium hydroxide Nutrition 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 230000009972 noncorrosive effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000012719 wet electrostatic precipitator Substances 0.000 description 1
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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Landscapes
- Treating Waste Gases (AREA)
Abstract
(57)【要約】
【課題】排ガス中の三酸化硫黄と、この排ガス中に注入
したアンモニアとの生成化合物を集塵装置で効率良く捕
集することのできる排ガス処理方法及び装置を提供す
る。
【解決手段】本発明に係る排ガス処理装置１０は、冷却
装置１８で冷却した排ガスに、アンモニア注入配管４０
からアンモニアを注入し、その生成化合物を乾式電気集
塵装置２０で捕集することによって、排ガス中から三酸
化硫黄を除去する。制御装置３６は、冷却装置１８の出
口に設けた温度検出器３８の検出値が、酸露点よりも５
〜２０℃低い値になるように、流量調節バルブ３４を調
節する。
(57) Abstract: Provided is an exhaust gas treatment method and apparatus capable of efficiently collecting a compound formed of sulfur trioxide in exhaust gas and ammonia injected into the exhaust gas by a dust collector. An exhaust gas treatment apparatus according to the present invention includes an exhaust gas cooled by a cooling device and an ammonia injection pipe.
From the exhaust gas, and the resulting compound is collected by the dry electrostatic precipitator 20 to remove sulfur trioxide from the exhaust gas. The control device 36 determines that the value detected by the temperature detector 38 provided at the outlet of the cooling device 18 is 5 degrees below the acid dew point.
The flow control valve 34 is adjusted so that the value becomes lower by ２０20 ° C.
Description
【０００１】[0001]
【発明の属する技術分野】本発明は排ガス処理方法及び
装置に係り、特に、三酸化硫黄が含まれる排ガスにアン
モニアを注入し、生成されたダストを乾式電気集塵装置
で捕集することによって排ガス中から三酸化硫黄を除去
する排ガス処理方法及び装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for treating exhaust gas, and more particularly to an exhaust gas containing sulfur trioxide by injecting ammonia into the exhaust gas and collecting the generated dust by a dry type electrostatic precipitator. The present invention relates to an exhaust gas treatment method and apparatus for removing sulfur trioxide from inside.
【０００２】[0002]
【従来の技術】残さ油や石油コークスなどを燃焼する
と、その燃焼排ガスには、三酸化硫黄（ＳＯ3 ）が含ま
れる。ＳＯ3 は、腐食性の高い硫酸ミストとなるおそれ
があるので、排ガス中から除去する必要がある。そこ
で、従来は、燃焼排ガス中にアンモニアガスを注入する
ことによって硫酸アンモニウムなどの反応化合物を生成
し、その反応化合物のダストを乾式電気集塵装置で捕集
することによって、ＳＯ3 を除去していた。2. Description of the Related Art When residual oil or petroleum coke is burned, its combustion exhaust gas contains sulfur trioxide (SO 3 ). Since SO 3 may become a highly corrosive sulfuric acid mist, it needs to be removed from the exhaust gas. Therefore, conventionally, to produce a reaction compound such as ammonium sulfate by injecting ammonia gas in the combustion exhaust gas by collecting dust of the reaction compounds in the dry electrostatic precipitator and was removed SO 3 .
【０００３】アンモニアとＳＯ3 の反応化合物は、アン
モニア注入時の排ガス温度やＳＯ3に対するアンモニア
のモル比によって異なり、排ガス温度が高い場合やアン
モニアのモル比が小さい場合には、反応化合物として酸
性硫安が生成されやすい。酸性硫安は、液化すると腐食
性を有するので、電気集塵装置などに防食処理を施さね
ばならず、コストが増加する問題がある。酸性硫安の生
成を抑制するためには、注入アンモニアのモル比を増加
すればよいが、その場合には未反応のリークアンモニア
が多くなり、これを処理する装置が別途必要になる。[0003] The reaction compound of ammonia and SO 3 varies depending on the temperature of the exhaust gas at the time of injection of ammonia and the molar ratio of ammonia to SO 3 . Is easy to be generated. Since acidic ammonium sulfate has a corrosive property when liquefied, it has to be subjected to anticorrosion treatment for an electric dust collector or the like, and there is a problem that the cost increases. In order to suppress the production of acidic ammonium sulfate, the molar ratio of the injected ammonia may be increased, but in that case, the amount of unreacted leaked ammonia increases, and a separate apparatus for treating this is required.
【０００４】このような問題を解消するため、特開平２
−２６５６１８号公報には、液体のアンモニアを排ガス
中に注入し、アンモニアの注入と同時に排ガスの温度を
１５０℃以下に下げる方法が提案されている。また、特
開平７−３０８５４０号公報には、排ガスを酸性硫安の
融点（１４７℃）以下に調温してからアンモニアを注入
する方法が提案されている。これらの方法は、酸性硫安
を腐食性のない固体状のダストとして捕集することによ
って、電気集塵装置の腐食を防止している。To solve such a problem, Japanese Patent Laid-Open No.
Japanese Patent Application No. 265618 proposes a method in which liquid ammonia is injected into exhaust gas and the temperature of the exhaust gas is lowered to 150 ° C. or lower at the same time as the injection of ammonia. Further, Japanese Patent Application Laid-Open No. 7-308540 proposes a method of injecting ammonia after adjusting the temperature of exhaust gas to a temperature equal to or lower than the melting point of acid ammonium sulfate (147 ° C.). These methods prevent the corrosion of the electrostatic precipitator by collecting the acidic ammonium sulfate as non-corrosive solid dust.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、ＳＯ3
とアンモニアの反応で生成されるダストは、粒径が小さ
く、単位ガス中に占める粒子の表面積の総和が大きいと
いう問題がある。したがって、このダストを含む排ガス
を乾式電気集塵装置に導くと、空間電荷効果によって放
電電流が抑制されるため、ダストを十分に帯電できず、
集塵効率が低下する。集塵効率を向上させるためには、
装置容量を大きくして帯電時間を増加させればよいが、
装置の設置スペースや装置重量の面から、より小型の装
置が望まれている背景があり、装置を大型化することは
できない。SUMMARY OF THE INVENTION However, SO 3
Dust generated by the reaction between ammonia and ammonia has a problem that the particle size is small and the total surface area of the particles in the unit gas is large. Therefore, when the exhaust gas containing this dust is guided to the dry type electrostatic precipitator, the discharge current is suppressed by the space charge effect, so that the dust cannot be sufficiently charged.
Dust collection efficiency decreases. To improve dust collection efficiency,
The charging time can be increased by increasing the device capacity,
In view of the installation space of the apparatus and the weight of the apparatus, there is a background that a smaller apparatus is desired, and the apparatus cannot be increased in size.
【０００６】本発明はこのような事情に鑑みてなされた
もので、排ガス中の三酸化硫黄と、この排ガス中に注入
したアンモニアとの生成化合物を集塵装置で効率良く捕
集することのできる排ガス処理方法及び装置を提供する
ことを目的とする。The present invention has been made in view of such circumstances, and it is possible to efficiently collect a compound formed of sulfur trioxide in exhaust gas and ammonia injected into the exhaust gas by a dust collector. An object of the present invention is to provide an exhaust gas treatment method and apparatus.
【０００７】[0007]
【課題を解決する為の手段】請求項１記載の発明は前記
目的を達成するために、三酸化硫黄が含まれる排ガス中
にアンモニアを注入し、アンモニアの注入によって生成
されたダストを集塵装置で捕集することによって、前記
三酸化硫黄を前記排ガス中から除去する排ガス処理方法
において、前記アンモニアが注入される前の排ガスを、
冷却手段によって冷却するとともに、冷却された排ガス
の温度が酸露点よりも５〜２０度低い値になるように前
記冷却手段による前記排ガスの冷却量を制御することを
特徴としている。According to a first aspect of the present invention, in order to achieve the above object, ammonia is injected into exhaust gas containing sulfur trioxide, and dust generated by the injection of ammonia is collected by a dust collector. By collecting in the exhaust gas treatment method for removing the sulfur trioxide from the exhaust gas, the exhaust gas before the ammonia is injected,
In addition to cooling by the cooling means, the cooling amount of the exhaust gas by the cooling means is controlled so that the temperature of the cooled exhaust gas is lower by 5 to 20 degrees than the acid dew point.
【０００８】請求項２記載の発明は前記目的を達成する
ために、三酸化硫黄が含まれる排ガス中にアンモニアを
注入する注入手段と、該注入手段がアンモニアを注入す
ることにより生成されたダストを捕集する集塵装置とを
備えた排ガス処理装置において、前記注入手段がアンモ
ニアを注入する前の排ガスを冷却する冷却手段と、該冷
却手段で冷却した排ガスの温度を検出する温度検出手段
と、該温度検出手段の検出値が酸露点よりも５〜２０度
低い値になるように前記冷却手段による前記排ガスの冷
却量を制御する制御手段と、を備えたことを特徴として
いる。According to a second aspect of the present invention, there is provided an injection means for injecting ammonia into an exhaust gas containing sulfur trioxide, and a dust generated by injecting the ammonia into the exhaust gas. In an exhaust gas treatment device provided with a dust collecting device that collects, a cooling unit that cools the exhaust gas before the injection unit injects ammonia, a temperature detection unit that detects a temperature of the exhaust gas cooled by the cooling unit, Control means for controlling the cooling amount of the exhaust gas by the cooling means so that the value detected by the temperature detecting means is a value lower by 5 to 20 degrees than the acid dew point.
【０００９】本発明によれば、排ガスの温度を酸露点よ
りも５〜２０度低くした後にアンモニアを注入するの
で、生成される反応化合物のダストの粒径が大きくな
り、集塵効率が向上する。According to the present invention, since ammonia is injected after the temperature of the exhaust gas is lowered by 5 to 20 degrees from the acid dew point, the particle size of the generated reactive compound dust increases, and the dust collection efficiency improves. .
【００１０】[0010]
【発明の実施の形態】以下添付図面に従って、本発明に
係る排ガス処理方法及び装置の好ましい実施の形態につ
いて詳説する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of an exhaust gas treatment method and apparatus according to the present invention will be described below in detail with reference to the accompanying drawings.
【００１１】図１は、本発明に係る排ガス処理装置１０
を示すフロー図である。FIG. 1 shows an exhaust gas treatment apparatus 10 according to the present invention.
It is a flowchart which shows.
【００１２】同図に示すように、排ガス処理装置１０
は、ボイラ１２の後段に、脱硝装置１４、エアヒータ１
６、冷却装置１８、乾式電気集塵装置２０、湿式脱硫装
置２２、湿式電気集塵装置２４、煙突２６が順に配設さ
れ、これらがダクト２８ａ〜２８ｇによって連通されて
いる。As shown in FIG.
A denitration device 14 and an air heater 1
6, a cooling device 18, a dry electric precipitator 20, a wet desulfurizer 22, a wet electric precipitator 24, and a chimney 26 are arranged in this order, and these are communicated by ducts 28a to 28g.
【００１３】ボイラ１２は、重油、残さ油、重質油、石
油コークス等の石油系燃料を燃焼させ、硫黄酸化物を多
く含む約４００℃の燃焼排ガスを後段に排出する。ボイ
ラ１２から排出された排ガスは、まず、脱硝装置１４に
導入され、排ガス中のＮＯxが除去される。次いで、排
ガスは、エアヒータ１６に導入されて熱回収され、約１
７０℃に冷却される。エアヒータ１６は、排ガスから回
収した熱によって燃焼用空気（不図示）を昇温させ、こ
の燃焼用空気をボイラ１２に供給する。The boiler 12 burns a petroleum-based fuel such as heavy oil, residual oil, heavy oil, petroleum coke, etc., and discharges a flue gas of about 400 ° C. containing a large amount of sulfur oxides at a later stage. Exhaust gas discharged from the boiler 12 is first introduced into a denitration apparatus 14, NO x in the exhaust gas are removed. Next, the exhaust gas is introduced into the air heater 16 and heat is recovered.
Cool to 70 ° C. The air heater 16 raises the temperature of the combustion air (not shown) by the heat recovered from the exhaust gas, and supplies the combustion air to the boiler 12.
【００１４】エアヒータ１６を通過した排ガスは、冷却
装置１８に導入される。冷却装置１８の内部にはノズル
３０が設けられ、このノズル３０には、配管３２が連通
されている。したがって、配管３２を介してノズル３０
に水を供給すると、ノズル３０から水が噴霧され、冷却
装置１８を通過する排ガスが冷却される。The exhaust gas having passed through the air heater 16 is introduced into a cooling device 18. A nozzle 30 is provided inside the cooling device 18, and a pipe 32 is connected to the nozzle 30. Therefore, the nozzle 30 is connected via the pipe 32.
Is supplied from the nozzle 30, water is sprayed from the nozzle 30, and the exhaust gas passing through the cooling device 18 is cooled.
【００１５】配管３２には、流量調節バルブ３４が配設
され、この流量調節バルブ３４の開度を調節することに
よって、ノズル３０に供給される水の流量が調節され
る。すなわち、ノズル３０から噴霧される水の流量（以
下、スプレ水の流量）が調節され、よって、冷却装置１
８を通過する排ガスの温度が調節される。なお、流量調
節バルブ３４は信号ケーブルを介して制御装置３６に接
続されており、制御装置３６によってその開度が調節さ
れる。A flow control valve 34 is provided in the pipe 32, and the flow rate of water supplied to the nozzle 30 is controlled by adjusting the opening of the flow control valve 34. That is, the flow rate of the water sprayed from the nozzle 30 (hereinafter, the flow rate of the spray water) is adjusted.
The temperature of the exhaust gas passing through 8 is adjusted. The flow control valve 34 is connected to a control device 36 via a signal cable, and the control device 36 adjusts the opening degree.
【００１６】冷却装置１８の出口側には、排ガスの温度
を検出する温度検出器３８が設けられている。温度検出
器３８は信号ケーブルを介して制御装置３６に接続され
ており、制御装置３６は、温度検出器３８から出力され
た検出信号に基づいて、流量調節バルブ３４の開度を調
節する。具体的には、温度検出器３８の検出値が酸露点
の５〜２０℃低い温度になるように流量調節バルブ３４
の開度を調節する。At the outlet side of the cooling device 18, a temperature detector 38 for detecting the temperature of the exhaust gas is provided. The temperature detector 38 is connected to the control device 36 via a signal cable, and the control device 36 adjusts the opening of the flow control valve 34 based on the detection signal output from the temperature detector 38. Specifically, the flow control valve 34 is adjusted so that the value detected by the temperature detector 38 is 5 to 20 ° C. lower than the acid dew point.
Adjust the opening of.
【００１７】冷却装置１８と乾式電気集塵装置２０とを
連通する配管２８ｄには、アンモニア注入配管４０が設
けられ、このアンモニア注入配管４０からアンモニアガ
スが排ガス中に注入される。注入されたアンモニアは排
ガス中のＳＯ3 と反応し、硫安を生成する。その際、酸
露点よりも温度が５〜２０℃低い排ガス中にアンモニア
を注入するので、硫安のダストは、粒径が大きくなる。An ammonia injection pipe 40 is provided in a pipe 28d that communicates the cooling device 18 and the dry type electrostatic precipitator 20, and ammonia gas is injected into exhaust gas from the ammonia injection pipe 40. The injected ammonia reacts with SO 3 in the exhaust gas to produce ammonium sulfate. At that time, since ammonia is injected into the exhaust gas whose temperature is lower than the acid dew point by 5 to 20 ° C., the particle size of the ammonium sulfate dust increases.
【００１８】硫安のダストを含む排ガスは、乾式電気集
塵装置２０に導入される。乾式電気集塵装置２０は、排
ガス中のダストに荷電を与え、帯電したダストをクーロ
ン力によって捕集する。このとき、ダストの粒径が大き
いので、乾式電気集塵装置２０の捕集効率が大きい。Exhaust gas containing ammonium sulfate dust is introduced into a dry electric precipitator 20. The dry electrostatic precipitator 20 applies a charge to the dust in the exhaust gas, and collects the charged dust by Coulomb force. At this time, since the particle diameter of the dust is large, the collection efficiency of the dry electrostatic precipitator 20 is high.
【００１９】ダストが捕集された排ガスは、湿式脱硫装
置２２に導入される。湿式脱硫装置２２は、消石灰や水
酸化マグネシウム等のスラリを排ガス中に噴霧すること
によって、主に排ガス中の二酸化硫黄を吸収除去する。The exhaust gas from which the dust has been collected is introduced into a wet desulfurizer 22. The wet desulfurization device 22 mainly absorbs and removes sulfur dioxide in the exhaust gas by spraying a slurry such as slaked lime or magnesium hydroxide into the exhaust gas.
【００２０】二酸化硫黄が除去された排ガスは、湿式電
気集塵装置２４に導入され、排ガス中のミストが除去さ
れる。以上により、排ガス中から硫黄酸化物などの有害
物質が除去され、その排ガスが、煙突２６から大気に放
出される。The exhaust gas from which the sulfur dioxide has been removed is introduced into a wet electrostatic precipitator 24, where mist in the exhaust gas is removed. As described above, harmful substances such as sulfur oxides are removed from the exhaust gas, and the exhaust gas is released from the chimney 26 to the atmosphere.
【００２１】以下に、排ガスの温度を酸露点よりも５〜
２０℃低い温度に制御した根拠について図２に基づいて
説明する。図２は、図１に示す排ガス処理装置１０で実
験を行った結果であり、ＳＯ3 濃度が３０ppm の排ガス
を冷却装置１８に導入し、スプレ水の流量を変化させな
がら、乾式電気集塵装置２０の入口でのフライングダス
トの粒径、及び、乾式電気集塵装置２０での一定印加電
圧下における放電電流値を測定したものである。In the following, the temperature of the exhaust gas is set to be 5 to 5 from the acid dew point.
The grounds for controlling the temperature to be lower by 20 ° C. will be described with reference to FIG. FIG. 2 shows the results of an experiment conducted with the exhaust gas treatment apparatus 10 shown in FIG. 1. The exhaust gas having an SO 3 concentration of 30 ppm was introduced into the cooling device 18, and the flow rate of the spray water was changed. In the figure, the particle size of the flying dust at the entrance of No. 20 and the discharge current value at a constant applied voltage in the dry electrostatic precipitator 20 were measured.
【００２２】図２から分かるように、スプレ水の流量の
変化に伴って、フライングダストの平均粒径も変化す
る。具体的には、平均粒径は、スプレ水の流量が約４．
８(L/h) の時をピークとして、約４．３〜５．３(L/h)
の範囲で著しく増加している。同様に、乾式電気集塵装
置２０における放電電流値も、スプレ水の流量が約４．
８(L/h) の時をピークとして、約４．３〜５．３(L/h)
の時に著しく増加している。As can be seen from FIG. 2, the average particle size of the flying dust changes as the flow rate of the spray water changes. Specifically, the average particle size is such that the flow rate of the spray water is about 4.
Approximately 4.3 to 5.3 (L / h) with the peak at 8 (L / h)
In the range. Similarly, as for the discharge current value in the dry type electrostatic precipitator 20, the flow rate of the spray water is about 4.
Approximately 4.3 to 5.3 (L / h) with the peak at 8 (L / h)
At the time of the increase.
【００２３】また、スプレ水の流量の変化に伴って、冷
却装置１８の出口側での排ガス温度（温度検出器３８の
検出値）も変化し、スプレ水の流量が約４．３〜５．３
(L/h) の時、約１２５〜１３５℃であった。Further, with the change in the flow rate of the spray water, the temperature of the exhaust gas at the outlet side of the cooling device 18 (the value detected by the temperature detector 38) also changes, so that the flow rate of the spray water is about 4.3-5. 3
(L / h), it was about 125 to 135 ° C.
【００２４】乾式電気集塵装置２０の集塵性能は、一般
にダスト粒径や放電電流値に影響され、これらの大きい
方が集塵効率が高い。したがって、ガス温度を約１２５
〜１３５℃に調節すれば、ダスト粒径が大きくなり、放
電電流が多く流れるので、乾式電気集塵装置２０の集塵
効率が上昇する。The dust collecting performance of the dry electric dust collecting apparatus 20 is generally affected by the particle diameter of the dust and the discharge current value, and the larger these are, the higher the dust collecting efficiency is. Therefore, the gas temperature is about 125
If the temperature is adjusted to 135 ° C., the dust particle size increases, and a large amount of discharge current flows, so that the dust collection efficiency of the dry electric dust collector 20 increases.
【００２５】図３は、排ガスのＳＯ3 濃度を３０ppm 、
６０ppm 、１００ppm 、１５０ppmと変化させて、上記
実験を繰り返し行った結果である。同表において、酸露
点とは、燃焼排ガス中の硫酸蒸気が凝縮し始める（最
高）温度であり、文献（例えば日本金属学会会報第１６
巻第３号、１３３頁）から引用される。FIG. 3 shows that the SO 3 concentration of the exhaust gas is 30 ppm,
These are the results of repeating the above experiment while changing the values to 60 ppm, 100 ppm, and 150 ppm. In the same table, the acid dew point is the temperature at which sulfuric acid vapor in the combustion exhaust gas starts to condense (maximum), and is described in the literature (for example, the Japan Institute of Metals Society 16
Vol. 3, p. 133).
【００２６】同図に示すように、放電電流が増加するス
プレ水の流量は、ＳＯ3 濃度が高くなるに連れて低下し
ている。また、放電電流が増加するガス温度は、ＳＯ3
濃度が高くなるに連れて増加している。このガス温度を
酸露点と比較すると、放電電流が増加するガス温度は、
酸露点よりも８〜１８℃程度低い値であることが分か
る。As shown in the figure, the flow rate of the spray water at which the discharge current increases decreases as the SO 3 concentration increases. The gas temperature at which the discharge current increases is SO 3
It increases as the concentration increases. Comparing this gas temperature with the acid dew point, the gas temperature at which the discharge current increases is
It can be seen that the value is about 8 to 18 ° C. lower than the acid dew point.
【００２７】したがって、酸露点よりも８〜１８℃程度
低い温度に制御すれば、乾式電気集塵装置２０の放電電
流が著しく大きくなり、乾式電気集塵装置２０の集塵効
率が大きく向上する。ただし、排ガスの温度を酸露点よ
りも５〜２０℃程度低い温度に制御した場合にも、放電
電流がある程度大きくなるので、乾式電気集塵装置２０
の集塵効率は向上する。Therefore, when the temperature is controlled to be about 8 to 18 ° C. lower than the acid dew point, the discharge current of the dry electric precipitator 20 is significantly increased, and the dust collecting efficiency of the dry electric precipitator 20 is greatly improved. However, even when the temperature of the exhaust gas is controlled to a temperature lower by about 5 to 20 ° C. than the acid dew point, the discharge current increases to some extent.
The dust collection efficiency is improved.
【００２８】このように本実施の形態は、冷却装置１８
の出口側の排ガス温度を検出し、この検出値が酸露点よ
りも５〜２０℃低くなるように流量調節バルブ３４を制
御しているので、乾式電気集塵装置２０の集塵効率を向
上させることができる。したがって、ＳＯ3 を含む排ガ
ス中にアンモニアを注入することによって生成された硫
安のダストを確実に除去することができる。As described above, in the present embodiment, the cooling device 18
The exhaust gas temperature at the outlet side is detected, and the flow control valve 34 is controlled so that the detected value is lower than the acid dew point by 5 to 20 ° C., so that the dust collection efficiency of the dry electric dust collector 20 is improved. be able to. Therefore, it is possible to reliably remove the ammonium sulfate dust generated by injecting ammonia into the exhaust gas containing SO 3 .
【００２９】なお、上述した実施の形態は、スプレ水の
流量を調節することによって、排ガスの温度を調節した
が、これに限定するものではなく、噴霧する水の温度を
制御して排ガスの温度を調節してもよい。また、他の冷
却方法によって排ガスの温度を調節してもよい。In the above-described embodiment, the temperature of the exhaust gas is adjusted by adjusting the flow rate of the spray water. However, the present invention is not limited to this. May be adjusted. Further, the temperature of the exhaust gas may be adjusted by another cooling method.
【００３０】[0030]
【発明の効果】以上説明したように本発明に係る排ガス
処理方法及び装置によれば、排ガスの温度を酸露点より
５〜２０度低くした後にアンモニアを注入したので、生
成される反応化合物のダストの粒径が大きくなり、集塵
効率が向上する。As described above, according to the exhaust gas treatment method and apparatus according to the present invention, ammonia is injected after the temperature of the exhaust gas is lowered by 5 to 20 degrees from the acid dew point, so that the reactive compound dust produced is produced. And the dust collection efficiency is improved.
【図１】本発明に係る排ガス処理装置のフローを示す図FIG. 1 is a diagram showing a flow of an exhaust gas treatment apparatus according to the present invention.
【図２】図１の排ガス処理装置を用いて行った実験結果
を示す図FIG. 2 is a view showing the results of an experiment performed using the exhaust gas treatment apparatus of FIG. 1;
【図３】排ガス中の三酸化硫黄の濃度変化に伴う実験結
果を示す表図FIG. 3 is a table showing experimental results accompanying changes in the concentration of sulfur trioxide in exhaust gas.
１０…排ガス処理装置、１２…ボイラ、１４…脱硝装
置、１６…エアヒータ、１８…冷却装置、２０…乾式電
気集塵装置、２２…湿式脱硫装置、２４…湿式電気集塵
装置、２６…煙突、２８ａ〜２８ｇ…ダクト、３０…ノ
ズル、３２…配管、３４…流量調節バルブ、３６…制御
装置、３８…温度検出器、４０…アンモニア注入配管Reference Signs List 10 exhaust gas treatment device, 12 boiler, 14 denitration device, 16 air heater, 18 cooling device, 20 dry electric dust collector, 22 wet desulfurizer, 24 wet electric dust collector, 26 chimney, 28a to 28g: duct, 30: nozzle, 32: pipe, 34: flow control valve, 36: control device, 38: temperature detector, 40: ammonia injection pipe
フロントページの続き (72)発明者 榊原 貞夫 東京都千代田区内神田１丁目１番14号 日 立プラント建設株式会社内 Ｆターム(参考） 4D002 AA02 AA12 BA02 BA03 BA13 BA14 BA16 CA01 DA05 DA06 DA07 DA12 DA35 EA01 EA02 EA05 FA06 GA01 GA02 GA03 GB03 GB05 GB11 HA02 Continued on the front page (72) Inventor Sadao Sakakibara 1-1-1-14 Uchikanda, Chiyoda-ku, Tokyo F-term in Hitachi Plant Construction Co., Ltd. 4D002 AA02 AA12 BA02 BA03 BA13 BA14 BA16 CA01 DA05 DA06 DA07 DA12 DA35 EA01 EA02 EA05 FA06 GA01 GA02 GA03 GB03 GB05 GB11 HA02
Claims (2)
アを注入し、アンモニアの注入によって生成されたダス
トを集塵装置で捕らえる捕集することによって、前記三
酸化硫黄を前記排ガス中から除去する排ガス処理方法に
おいて、 前記アンモニアが注入される前の排ガスを、冷却手段に
よって冷却するとともに、冷却された排ガスの温度が酸
露点よりも５〜２０度低い値になるように前記冷却手段
による前記排ガスの冷却量を制御することを特徴とする
排ガス処理方法。1. An ammonia is injected into an exhaust gas containing sulfur trioxide, and the dust generated by the injection of the ammonia is trapped and collected by a dust collector, whereby the sulfur trioxide is removed from the exhaust gas. In the exhaust gas treatment method, the exhaust gas before the ammonia is injected is cooled by a cooling unit, and the exhaust gas is cooled by the cooling unit such that the temperature of the cooled exhaust gas is a value lower by 5 to 20 degrees than an acid dew point. An exhaust gas treatment method comprising controlling a cooling amount of a waste gas.
アを注入する注入手段と、該注入手段がアンモニアを注
入することにより生成されたダストを捕集する集塵装置
とを備えた排ガス処理装置において、 前記注入手段がアンモニアを注入する前の排ガスを冷却
する冷却手段と、 該冷却手段で冷却した排ガスの温度を検出する温度検出
手段と、 該温度検出手段の検出値が酸露点よりも５〜２０度低い
値になるように前記冷却手段による前記排ガスの冷却量
を制御する制御手段と、 を備えたことを特徴とする排ガス処理装置。2. An exhaust gas treatment apparatus comprising: an injection means for injecting ammonia into an exhaust gas containing sulfur trioxide; and a dust collector for collecting dust generated by injecting the ammonia with the injection means. A cooling means for cooling the exhaust gas before the injection means injects ammonia; a temperature detecting means for detecting a temperature of the exhaust gas cooled by the cooling means; Control means for controlling a cooling amount of the exhaust gas by the cooling means so as to have a value lower by 20 degrees.
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| JP2001136168A JP3603811B2 (en) | 2001-05-07 | 2001-05-07 | Exhaust gas treatment method and apparatus |
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|---|---|---|---|
| JP2001136168A JP3603811B2 (en) | 2001-05-07 | 2001-05-07 | Exhaust gas treatment method and apparatus |
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| JP3603811B2 JP3603811B2 (en) | 2004-12-22 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008136486A1 (en) * | 2007-05-01 | 2008-11-13 | Hitachi Plant Technologies, Ltd. | Exhaust gas treatment method and device |
| JP2010234322A (en) * | 2009-03-31 | 2010-10-21 | Chugoku Electric Power Co Inc:The | Exhaust gas purification method and exhaust gas purification apparatus |
| JP2015166090A (en) * | 2010-05-31 | 2015-09-24 | 三菱重工業株式会社 | Exhaust gas treatment system and exhaust gas treatment method |
| JP2015166089A (en) * | 2010-05-31 | 2015-09-24 | 三菱重工業株式会社 | Exhaust gas treatment system and exhaust gas treatment method |
| JP2015193005A (en) * | 2010-05-31 | 2015-11-05 | 三菱重工業株式会社 | exhaust gas treatment system and method |
| US9381461B2 (en) | 2010-05-31 | 2016-07-05 | Mitsubishi Heavy Industries, Ltd. | Air pollution control system and method |
-
2001
- 2001-05-07 JP JP2001136168A patent/JP3603811B2/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008136486A1 (en) * | 2007-05-01 | 2008-11-13 | Hitachi Plant Technologies, Ltd. | Exhaust gas treatment method and device |
| JP2010234322A (en) * | 2009-03-31 | 2010-10-21 | Chugoku Electric Power Co Inc:The | Exhaust gas purification method and exhaust gas purification apparatus |
| JP2015166090A (en) * | 2010-05-31 | 2015-09-24 | 三菱重工業株式会社 | Exhaust gas treatment system and exhaust gas treatment method |
| JP2015166089A (en) * | 2010-05-31 | 2015-09-24 | 三菱重工業株式会社 | Exhaust gas treatment system and exhaust gas treatment method |
| JP2015193005A (en) * | 2010-05-31 | 2015-11-05 | 三菱重工業株式会社 | exhaust gas treatment system and method |
| US9381461B2 (en) | 2010-05-31 | 2016-07-05 | Mitsubishi Heavy Industries, Ltd. | Air pollution control system and method |
| US10835862B2 (en) | 2010-05-31 | 2020-11-17 | Mitsubishi Heavy Industries Engineering, Ltd. | Air pollution control system and method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3603811B2 (en) | 2004-12-22 |
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