JPS6359730B2 - - Google Patents
Info
- Publication number
- JPS6359730B2 JPS6359730B2 JP60298906A JP29890685A JPS6359730B2 JP S6359730 B2 JPS6359730 B2 JP S6359730B2 JP 60298906 A JP60298906 A JP 60298906A JP 29890685 A JP29890685 A JP 29890685A JP S6359730 B2 JPS6359730 B2 JP S6359730B2
- Authority
- JP
- Japan
- Prior art keywords
- denitrification
- tower
- gas
- desulfurization
- sox
- 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
- 239000007789 gas Substances 0.000 claims description 36
- 238000006477 desulfuration reaction Methods 0.000 claims description 29
- 230000023556 desulfurization Effects 0.000 claims description 29
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 15
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 15
- 238000011084 recovery Methods 0.000 claims description 11
- 229910052717 sulfur Inorganic materials 0.000 claims description 11
- 239000011593 sulfur Substances 0.000 claims description 11
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 10
- 229910021529 ammonia Inorganic materials 0.000 claims description 4
- 238000003795 desorption Methods 0.000 claims description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 2
- 239000003546 flue gas Substances 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910000069 nitrogen hydride Inorganic materials 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)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Description
【発明の詳細な説明】
（技術分野）
本発明は、活性炭を使用した排ガスの乾式脱硫
脱硝装置に関し、特に大巾に負荷が変動する場合
においても、効果的に脱硝を行うことの出来る処
理装置に関する。Detailed Description of the Invention (Technical Field) The present invention relates to a dry-type desulfurization and denitration equipment for exhaust gas using activated carbon, and in particular to a treatment equipment that can effectively denitrate even when the load fluctuates widely. Regarding.
（従来技術）
一般に、活性炭を使用して排ガスの脱硫および
脱硝を行う乾式脱硫脱硝二段処理装置は、脱硫塔
と脱硝塔において、これらの塔内を排ガスが順次
通過する際に、それぞれ重点的に脱硫および脱硝
処理を行うようになつているものである。すなわ
ち排ガスは、まず脱硫塔で脱硫された後、脱硝塔
で脱硝される。(Prior art) In general, a dry desulfurization and denitrification two-stage treatment equipment that uses activated carbon to desulfurize and denitrify exhaust gas has a desulfurization tower and a denitrification tower. It is designed to perform desulfurization and denitrification treatment. That is, the exhaust gas is first desulfurized in a desulfurization tower, and then denitrated in a denitrification tower.
ここで、脱硝塔において80％以上の脱硝率を
得、かつNH3のリーク量を20ppm以下に押える
ためには、脱硝塔入口におけるSO2濃度が30〜
100ppmである必要がある。しかしガス中のSO2
濃度が1000ppmから400ppmに大巾に変化する場
合には、脱硝塔入口のSO2濃度は50ppm以下とな
り、この状態で脱硝塔でのNH3リークを20ppm
以下に押えようとすると、全脱硝率を80％以上に
維持出来なくなり、反対に脱硝率を上げようとす
れば、NH3リークが増大してしまうこととなる。 Here, in order to obtain a denitrification rate of 80% or more in the denitrification tower and to suppress the leakage amount of NH 3 to 20 ppm or less, the SO 2 concentration at the denitrification tower inlet must be 30 to 30%.
Must be 100ppm. But SO 2 in gas
When the concentration changes widely from 1000ppm to 400ppm, the SO 2 concentration at the inlet of the denitrification tower becomes 50ppm or less, and in this state, the NH 3 leakage in the denitrification tower is reduced to 20ppm.
If you try to keep the total denitrification rate below 80%, you will not be able to maintain the total denitrification rate above 80%, and if you try to increase the denitrification rate, the NH 3 leak will increase.
また脱硫脱硝装置を設計する場合、排ガス中に
含まれているSOx、NOx濃度により基本数値が
異なるが、一般的には高濃度、高負荷に対応して
設計しておけば、低濃度、低負荷の場合にも高効
率を達成することが出来る。 In addition, when designing a desulfurization and denitrification equipment, the basic values differ depending on the concentration of SOx and NOx contained in the exhaust gas, but in general, if it is designed for high concentrations and high loads, it is possible to High efficiency can also be achieved under load.
しかし脱硫脱硝二段処理の場合には、高濃度
SOxの高負荷で設計した装置で低負荷運転を行う
と、脱硫塔での脱硫効率が上がり過ぎ、脱硝塔に
入るガス中のSOx濃度が、脱硝塔における脱硝効
率を維持するのに必要な濃度30〜100ppmよりも
下回つてしまうことになる。このように脱硝塔入
口のSOx濃度が低い場合には、注入したNH3の
リークが多くなり、所定の脱硝率を得ることが出
来ない。 However, in the case of two-stage desulfurization and denitrification treatment, high concentration
If a device designed for a high SOx load is operated at a low load, the desulfurization efficiency in the desulfurization tower will increase too much, and the SOx concentration in the gas entering the denitrification tower will be lower than the concentration necessary to maintain the denitrification efficiency in the denitrification tower. This will result in a drop below 30 to 100 ppm. When the SOx concentration at the inlet of the denitrification tower is low as described above, leakage of the injected NH 3 increases, making it impossible to obtain a predetermined denitrification rate.
以上のような問題から、従来の脱硫脱硝装置に
おいては、大巾なガス中のSOx濃度の変動があつ
た場合に十分な脱硝効率を維持するのが困難であ
るといつた欠点を有するものであつた。 Due to the above-mentioned problems, conventional desulfurization and denitrification equipment has the disadvantage that it is difficult to maintain sufficient denitrification efficiency when there are wide fluctuations in the SOx concentration in the gas. It was hot.
（目的）
この発明は、以上のような従来の脱硫脱硝二段
処理装置における欠点を解消するために為された
ものであつて、負荷変動すなわちガス中のSOx濃
度の大巾な変動があつた場合であつても、常に所
定の脱硝効率を維持することの出来る脱硫脱硝二
段処理装置を提供することを目的とするものであ
る。(Purpose) This invention was made to eliminate the drawbacks of the conventional two-stage desulfurization and denitrification treatment equipment as described above. It is an object of the present invention to provide a two-stage desulfurization and denitrification treatment device that can always maintain a predetermined denitrification efficiency even when
（構成）
この発明は、上記目的を達成するため、アンモ
ニアが供給される脱硫塔および脱硝塔内を排ガス
が順次通過することによつて、排ガスの脱硫およ
び脱硝処理を行い、脱離塔で活性炭からSOxを分
離し、イオウ回収装置において前記SOxを還元し
て単体イオウを回収してオフガスを排出する乾式
脱硫脱硝装置において、前記イオウ回収装置から
排出されたオフガスを脱硝塔排ガス入口に導入す
るためのオフガス配管を設けたものである。(Structure) In order to achieve the above object, the present invention performs desulfurization and denitration treatment of the exhaust gas by sequentially passing through a desulfurization tower and a denitrification tower to which ammonia is supplied, and activates carbon in the desorption tower. In a dry desulfurization and denitrification device that separates SOx from the sulfur recovery device, reduces the SOx in a sulfur recovery device, recovers elemental sulfur, and discharges off-gas, for introducing the off-gas discharged from the sulfur recovery device into the denitrification tower exhaust gas inlet. This is equipped with off-gas piping.
以下この発明を、図面に示す実施例に基づいて
さらに詳細に説明を行う。 The present invention will be explained in more detail below based on embodiments shown in the drawings.
第１図において、脱硫塔１および脱硝塔２には
活性炭Ａが循環して供給されるようになつてお
り、この脱硫塔１に排ガスＢが導入されるように
なつている。そして脱硫塔１を通過して脱硫処理
された排ガスは脱硝塔２に導入され、脱硝処理
後、排気される。また脱硫塔１および脱硝塔２で
脱硫および脱硝処理を行つた活性炭は脱離塔３に
導入され、この脱離塔３において活性炭から高濃
度SOxが分離排出される。 In FIG. 1, activated carbon A is circulated and supplied to a desulfurization tower 1 and a denitrification tower 2, and an exhaust gas B is introduced into the desulfurization tower 1. The exhaust gas that has passed through the desulfurization tower 1 and has been desulfurized is introduced into the denitration tower 2, and after the denitration treatment is exhausted. Furthermore, the activated carbon that has been desulfurized and denitrated in the desulfurization tower 1 and the denitrification tower 2 is introduced into a desorption tower 3, where highly concentrated SOx is separated and discharged from the activated carbon.
この活性炭から分離されたSOxはイオウ回収装
置４に導入され、このイオウ回収装置４において
還元されて単体イオウＣとしてイオウタンク５に
回収される。 The SOx separated from the activated carbon is introduced into a sulfur recovery device 4, where it is reduced and recovered as elemental sulfur C in a sulfur tank 5.
なお、脱硫塔１および脱硝塔２には、それぞれ
入口においてアンモニアＤが供給されるようにな
つている。 Note that ammonia D is supplied to the desulfurization tower 1 and the denitrification tower 2 at their respective inlets.
以上の処理工程は、従来の脱硫脱硝二段処理装
置の処理工程と同様である。 The above treatment steps are similar to those of a conventional two-stage desulfurization and denitrification treatment device.
本発明は、上記処理装置のイオウ回収装置４と
脱硝塔２の入口との間にオフガス配管６，７を設
け、イオウ回収装置から排出されるオフガスＥを
脱硝塔２の入口に導入することが出来るようにし
たものであり、かつオフガス配管７の途中に切替
バルブ８を設けて、オフガスＥの供給量を調節す
ることが出来るようにしたものである。 The present invention provides off-gas pipes 6 and 7 between the sulfur recovery device 4 of the treatment equipment and the inlet of the denitrification tower 2, so that the off-gas E discharged from the sulfur recovery device can be introduced into the inlet of the denitrification tower 2. In addition, a switching valve 8 is provided in the middle of the off-gas pipe 7 so that the amount of off-gas E supplied can be adjusted.
ここでイオウ回収装置４における単体イオウの
回収率は90〜95％が限度であり、例えば排ガスＢ
中のSOxが500ppmである場合、オフガスＥ中に
残留するSOxは、排ガス換算で50ppmである。従
来は、このオフガスは大気放出した場合、全体の
脱硫率を低下させることになるので、配管９によ
つて再度脱硫塔入口に導入して処理を行つていた
ものである。 Here, the recovery rate of elemental sulfur in the sulfur recovery device 4 is limited to 90 to 95%, for example, the exhaust gas B
If the SOx in the off-gas E is 500 ppm, the SOx remaining in the off-gas E is 50 ppm in terms of exhaust gas. Conventionally, if this off-gas were released into the atmosphere, it would reduce the overall desulfurization rate, so it was once again introduced into the desulfurization tower inlet via piping 9 for treatment.
上記脱硫脱硝二段処理装置によれば、高濃度
SOx（800〜1000ppm）で計画された装置で、低濃
度（400〜600ppm）の排ガスを処理しようとする
場合、バルブ８を開け、オフガスＥをオフガス配
管６，７から脱硝塔２の入口に導き脱硝塔入口で
のSOx濃度が30〜100ppmの範囲で維持されるよ
うにコントロールしてやれば、低負荷SOxの排ガ
スについても常に所定の脱硝効率を維持すること
が可能となるものである。なおこの発明は、ガス
中のSOx濃度が4.0％以上変動する場合に有効で
ある。 According to the above-mentioned two-stage desulfurization and denitrification treatment equipment, high concentration
When attempting to treat low concentration (400 to 600 ppm) exhaust gas in a device designed for SOx (800 to 1000 ppm), open valve 8 and guide off gas E from off gas pipes 6 and 7 to the inlet of denitrification tower 2. By controlling the SOx concentration at the inlet of the denitrification tower to be maintained within the range of 30 to 100 ppm, it is possible to always maintain a predetermined denitrification efficiency even for low-load SOx exhaust gas. Note that this invention is effective when the SOx concentration in the gas fluctuates by 4.0% or more.
第２図は、NH3リークが一定の場合（出口
NH3が10ppmの場合）の脱硝塔入口のSOx濃度
と脱硝率との関係を示したものであつて、この図
からSOx濃度が30〜100ppmの範囲において、80
％以上の脱硝率が得られることが分る。 Figure 2 shows the case where NH3 leakage is constant (outlet
This figure shows the relationship between the SOx concentration at the inlet of the denitrification tower and the denitrification rate when NH 3 is 10 ppm.
% or more can be obtained.
（効果）
以上のようにこの発明は、イオウ回収装置から
排出されたオフガスを、脱硝塔入口に導入するよ
うにしたことにより、高濃度SOxに対応して計画
された処理装置で、低濃度SOxの排ガスの脱硫脱
硝処理を行う場合であつても、脱硝塔入口のSOx
濃度を一定に維持できることによつて、大巾に負
荷が変動する場合であつても、常に所定の脱硝効
率を維持することが出来るという優れた効果を有
するものである。(Effects) As described above, this invention is a treatment device designed to deal with high concentration SOx, by introducing the off-gas discharged from the sulfur recovery device into the inlet of the denitrification tower, and is capable of handling low concentration SOx. Even when desulfurization and denitration treatment is performed on flue gas, SOx at the entrance of the denitrification tower
By being able to maintain a constant concentration, it has the excellent effect of always maintaining a predetermined denitrification efficiency even when the load fluctuates widely.
第１図はこの発明の一実施例を示す概略構成
図、第２図はNH3リークが一定の場合の脱硝塔
入口のSOx濃度と脱硝率との関係を示す図であ
る。
１…脱硫塔、２…脱硝塔、４…イオウ回収装
置、６，７…オフガス配管、８…切替バルブ、Ｂ
…排ガス、Ｄ…アンモニア、Ｅ…オフガス。
FIG. 1 is a schematic diagram showing an embodiment of the present invention, and FIG. 2 is a diagram showing the relationship between the SOx concentration at the inlet of the denitrification tower and the denitrification rate when the NH 3 leakage is constant. 1... Desulfurization tower, 2... Denitration tower, 4... Sulfur recovery device, 6, 7... Off gas piping, 8... Switching valve, B
...Exhaust gas, D...Ammonia, E...Off gas.
Claims (1)
内を排ガスが順次通過することによつて、排ガス
の脱硫および脱硝処理を行い、脱離塔で活性炭か
らSOxを分離し、イオウ回収装置において前記
SOxを還元して単体イオウを回収し、オフガスを
排出する乾式脱硫脱硝二段処理装置において、前
記イオウ回収装置から排出されたオフガスを脱硝
塔排ガス入口に導入するためのオフガス配管を設
けたことを特徴とする乾式脱硫脱硝二段処理装
置。1 The exhaust gas is desulfurized and denitrated by sequentially passing through the desulfurization tower into which ammonia is injected and the denitrification tower. SOx is separated from activated carbon in the desorption tower, and the
In a dry desulfurization and denitrification two-stage treatment device that reduces SOx, recovers elemental sulfur, and discharges off-gas, an off-gas pipe is provided to introduce the off-gas discharged from the sulfur recovery device into the denitrification tower flue gas inlet. Features: Dry desulfurization and denitrification two-stage treatment equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60298906A JPS62155924A (en) | 1985-12-28 | 1985-12-28 | Two-stage treatment equipment for desulfurization and denitration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60298906A JPS62155924A (en) | 1985-12-28 | 1985-12-28 | Two-stage treatment equipment for desulfurization and denitration |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62155924A JPS62155924A (en) | 1987-07-10 |
| JPS6359730B2 true JPS6359730B2 (en) | 1988-11-21 |
Family
ID=17865693
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60298906A Granted JPS62155924A (en) | 1985-12-28 | 1985-12-28 | Two-stage treatment equipment for desulfurization and denitration |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62155924A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017179107A1 (en) * | 2016-04-11 | 2017-10-19 | 日揮株式会社 | Exhaust gas processing system |
-
1985
- 1985-12-28 JP JP60298906A patent/JPS62155924A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62155924A (en) | 1987-07-10 |
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