JPH02268809A - Thermal plant system provided with wet type stack gas treatment equipment - Google Patents
Thermal plant system provided with wet type stack gas treatment equipmentInfo
- Publication number
- JPH02268809A JPH02268809A JP1091025A JP9102589A JPH02268809A JP H02268809 A JPH02268809 A JP H02268809A JP 1091025 A JP1091025 A JP 1091025A JP 9102589 A JP9102589 A JP 9102589A JP H02268809 A JPH02268809 A JP H02268809A
- Authority
- JP
- Japan
- Prior art keywords
- gas treatment
- wet type
- fuel
- treatment device
- wastewater
- 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
- 239000002351 wastewater Substances 0.000 claims abstract description 25
- 238000002485 combustion reaction Methods 0.000 claims abstract description 13
- 239000000446 fuel Substances 0.000 claims abstract description 12
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 18
- 239000003546 flue gas Substances 0.000 claims description 18
- 239000007789 gas Substances 0.000 claims description 14
- 238000010521 absorption reaction Methods 0.000 abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 16
- 239000000126 substance Substances 0.000 abstract description 8
- 239000003250 coal slurry Substances 0.000 abstract description 6
- 238000006386 neutralization reaction Methods 0.000 abstract description 6
- 239000007787 solid Substances 0.000 abstract description 6
- 239000006228 supernatant Substances 0.000 abstract description 5
- 239000007788 liquid Substances 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 239000002562 thickening agent Substances 0.000 abstract 2
- 239000002699 waste material Substances 0.000 abstract 1
- 238000006477 desulfuration reaction Methods 0.000 description 15
- 230000023556 desulfurization Effects 0.000 description 15
- 239000002002 slurry Substances 0.000 description 12
- 238000004065 wastewater treatment Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 5
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000000428 dust Substances 0.000 description 4
- 239000010440 gypsum Substances 0.000 description 4
- 229910052602 gypsum Inorganic materials 0.000 description 4
- 239000008235 industrial water Substances 0.000 description 4
- 239000004071 soot Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 239000012717 electrostatic precipitator Substances 0.000 description 3
- 229910052736 halogen Inorganic materials 0.000 description 3
- 150000002366 halogen compounds Chemical class 0.000 description 3
- 150000002367 halogens Chemical class 0.000 description 3
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 2
- 230000002745 absorbent Effects 0.000 description 2
- 239000002250 absorbent Substances 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 229910052801 chlorine Inorganic materials 0.000 description 2
- 239000000460 chlorine Substances 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000000034 method Methods 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
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 150000002222 fluorine compounds Chemical class 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- RPACBEVZENYWOL-XFULWGLBSA-M sodium;(2r)-2-[6-(4-chlorophenoxy)hexyl]oxirane-2-carboxylate Chemical compound [Na+].C=1C=C(Cl)C=CC=1OCCCCCC[C@]1(C(=O)[O-])CO1 RPACBEVZENYWOL-XFULWGLBSA-M 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、湿式排煙処理装置を備えた火力プラントシス
テムに係り、特に排煙処理によって排出される排水の処
理に好適なものに関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a thermal power plant system equipped with a wet flue gas treatment device, and particularly to one suitable for treating wastewater discharged by flue gas treatment.
大気汚染を防止するため、燃焼排ガス中の硫黄酸化物の
除去装置として、湿式石灰石−石膏法による湿式排煙脱
硫装置が広く実用化されている。In order to prevent air pollution, wet flue gas desulfurization equipment using a wet limestone-gypsum method has been widely put into practical use as a device for removing sulfur oxides from combustion exhaust gas.
石炭焚きボイラ排ガスに適用される湿式排煙脱硫装置は
、硫黄酸化物やばいじんを除去するだけでなく、排ガス
中のハロゲンガスをも吸収除去するようになっている。Wet flue gas desulfurization equipment applied to coal-fired boiler exhaust gas not only removes sulfur oxides and soot, but also absorbs and removes halogen gas from the exhaust gas.
このようなボイラの排ガス処理装置を第３図に示す。図
示のように、ボイラ１の排ガスは、まず通常乾式集じん
機２においてばいじんが除去される。その後、吸収塔３
に導かれて二酸化硫黄とハロゲン化合物が除去されると
ともに、乾式集じん機２で除去しきれなかったばいじん
が除去される。FIG. 3 shows an exhaust gas treatment device for such a boiler. As shown in the figure, the exhaust gas from the boiler 1 is usually subjected to a dry dust collector 2 in which soot and dust are removed. After that, absorption tower 3
In addition to removing sulfur dioxide and halogen compounds, the dust that could not be removed by the dry dust collector 2 is also removed.
吸収塔３では吸収剤としての石灰石を含んでなる吸収剤
スラリを循環ライン４を通して循環スプレーさせ、二酸
化硫黄とハロゲン化合物を捕集除去する。この際、排ガ
スがスラリにより冷却され、これによりスラリ中の水が
蒸発する。そこで、蒸発水を補うために新しい工業用水
とシラフナ６のシラフナ上澄水８が吸収塔戻りライン９
より吸収塔３へ供給される。一方、スラリ中に吸収され
たハロゲン化合物（主に塩化物）は溶解度が高いため系
内で濃縮し、ステンレス系材料の腐食を起こす。そこで
、腐食を防ぐため、シラフナ６のシラフナ上澄水８の一
部を吸収塔戻りライン９から連続的に抜出し、系内の塩
素濃度を一定の値以下となるようにする。この抜出され
た脱硫排水１０は塩素の他、同様に吸収されたフッ素や
系内で副生されたＣＯＤ起因物質を含むためそのまま系
外へ排出することはできない。そこで排水処理装置が設
けられている。In the absorption tower 3, an absorbent slurry containing limestone as an absorbent is circulated and sprayed through a circulation line 4 to collect and remove sulfur dioxide and halogen compounds. At this time, the exhaust gas is cooled by the slurry, and the water in the slurry evaporates. Therefore, in order to supplement the evaporated water, new industrial water and Shirafuna supernatant water 8 from Shirafuna 6 are sent to the absorption tower return line 9.
is supplied to the absorption tower 3. On the other hand, the halogen compounds (mainly chlorides) absorbed in the slurry have high solubility, so they concentrate in the system and cause corrosion of stainless steel materials. Therefore, in order to prevent corrosion, a portion of the Shirafuna supernatant water 8 of the Shirafuna 6 is continuously extracted from the absorption tower return line 9 to keep the chlorine concentration in the system below a certain value. This extracted desulfurization wastewater 10 contains not only chlorine but also absorbed fluorine and COD-causing substances produced as by-products in the system, so it cannot be discharged to the outside of the system as it is. Therefore, wastewater treatment equipment is provided.
［発明が解決しようとする課題］
ところが、一般に湿式排煙脱硫装置などの湿式排煙処理
装置における排水処理は処理すべき排水の量が大であり
、かつ種々の物質を除去するとともに、ＰＨ等の調整が
要求されることから、大形で複雑な処理プロセスのもの
になるという問題がある。例えば、上記の排水処理装置
２０における処理は、通常排水中の固形物を除去した後
、アルカリ（Ｃａ塩、Ｎａ塩）等を添加してフッ素化合
物を除去し、その後ＣＯＤ起因物質（Ｓ２０６′−等）
をイオン吸着樹脂等により除去してｐＨ調節するように
なっている。[Problems to be Solved by the Invention] However, in general, wastewater treatment in wet flue gas treatment equipment such as wet flue gas desulfurization equipment requires a large amount of wastewater to be treated, and in addition to removing various substances, PH etc. The problem is that this requires a large and complicated processing process. For example, the treatment in the wastewater treatment device 20 described above usually involves removing solid matter from wastewater, adding alkali (Ca salt, Na salt), etc. to remove fluorine compounds, and then removing COD-causing substances (S206'- etc)
The pH is adjusted by removing it using an ion adsorption resin or the like.
本発明の目的は、上記従来技術の問題を解決することに
あり、言い換えれば、排水処理装置の処理量を軽減して
、装置を小形化できる湿式排煙処理装置を備えた火力プ
ラントシステムを提供することにある。An object of the present invention is to solve the problems of the prior art described above. In other words, it is an object of the present invention to provide a thermal power plant system equipped with a wet flue gas treatment device that can reduce the processing amount of the wastewater treatment device and downsize the device. It's about doing.
本発明は、上記目的を達成するため、燃焼装置と、この
燃焼装置の排ガスを処理する湿式排煙処理装置とを含ん
でなる火力プラントシステムにおいて、湿式排煙処理装
置から排出される排水の少なくとも一部を、前記燃焼装
置に供給される燃料に添加して処理する手段を設けたこ
とを特徴とする。In order to achieve the above object, the present invention provides a thermal power plant system including a combustion device and a wet flue gas treatment device for treating exhaust gas from the combustion device, in which at least one of the wastewater discharged from the wet flue gas treatment device is treated. The present invention is characterized in that a means is provided for adding a portion of the fuel to the fuel supplied to the combustion device for processing.
このような構成とすることにより、燃料に添加された湿
式排煙処理装置の排水の少なくとも一部は、燃焼装置に
て蒸発され、含有物質は排ガスとともに湿式排煙処理装
置に導びかれ、吸収剤スラリ等による吸収除去が繰返し
行なわれる。その結果、系外へ排出する排水の量が低減
され、排水処理装置を小形化することが可能になる。With this configuration, at least a part of the waste water from the wet flue gas treatment device added to the fuel is evaporated in the combustion device, and the contained substances are guided to the wet flue gas treatment device along with the exhaust gas and absorbed. Absorption and removal using a chemical slurry or the like is repeated. As a result, the amount of wastewater discharged outside the system is reduced, making it possible to downsize the wastewater treatment device.
また、燃焼装置の燃料として微粉炭スラリか用いられる
火力プラントシステムにあっては、微粉炭スラリ用の液
体として一般に大量の水が用いられる。このスラリ用液
体として又はその一部として上記排水を適用することが
望ましい。これによれば、排水の全量をスラリ用水とす
ることができ。Furthermore, in thermal power plant systems that use pulverized coal slurry as fuel for combustion equipment, a large amount of water is generally used as the liquid for the pulverized coal slurry. It is desirable to apply the waste water as the slurry liquid or as part of it. According to this, the entire amount of wastewater can be used as slurry water.
格別な排水処理が不要になるとともに、スラリ用水とし
ての工業用水を大幅に節約できる。Not only does special wastewater treatment become unnecessary, but industrial water used as slurry water can be significantly saved.
なお、湿式排煙処理装置のシステム構成によっては、脱
硫装置の吸収塔の前で、排水ガス中のばいじんやハロゲ
ンガスを水スプレー等により除去する場合がある。この
場合の排水はＰＨが低いので、微粉炭のスラリ用水とし
て適用するには、アルカリを添加して中和処理すること
が望ましい。Depending on the system configuration of the wet flue gas treatment device, soot and halogen gas in the waste gas may be removed by water spray or the like in front of the absorption tower of the desulfurization device. Since the wastewater in this case has a low pH, it is desirable to neutralize it by adding an alkali in order to use it as slurry water for pulverized coal.
しかし、上記ばいじんやハロゲンガスの除去を、排煙脱
硫の吸収塔で同時に行なうシステムの場合には、吸収塔
から生ずる脱硫排水のＰＨはあまり低くないので、中和
処理することなく、そのまま微粉炭のスラリ用水とする
ことが可能である。However, in the case of a system in which the above-mentioned soot and halogen gas are removed at the same time in an absorption tower for flue gas desulfurization, the pH of the desulfurization wastewater generated from the absorption tower is not very low, so pulverized as it is without being neutralized. It is possible to use it as slurry water.
以下、本発明を実施例に基づいて説明する。 Hereinafter, the present invention will be explained based on examples.
第１図に本発明が適用された火力プラントシステムの一
実施例構成図を示す。なお、第３図と同一機能同一構成
のものについては、同一符号を付して説明を省略する。FIG. 1 shows a configuration diagram of an embodiment of a thermal power plant system to which the present invention is applied. Components having the same functions and configurations as those in FIG. 3 are given the same reference numerals and their explanations will be omitted.
吸収塔３から抜出された石膏を含有する吸収液はシラフ
ナ６に導びかれ、ここにおいて大部分の固形物（石膏が
主成分）が分離除去される。分離された石膏１１は脱水
機７にて脱水されて排出される。The absorption liquid containing gypsum extracted from the absorption tower 3 is led to the Shirafuna 6, where most of the solids (mainly composed of gypsum) are separated and removed. The separated gypsum 11 is dehydrated in a dehydrator 7 and discharged.
一方、シラフナ６の上澄水８の一部は脱硫排水１０とし
て抜出されて中和槽１３に導びかれ、ここにおいて中和
処理がなされる。中和剤としてＮａＯＨ，Ｃａ（○Ｈ）
２等のアルカリ剤１２が添加されるようになっている。On the other hand, a part of the supernatant water 8 of the Shirafuna 6 is extracted as desulfurization wastewater 10 and led to a neutralization tank 13, where it is neutralized. NaOH, Ca (○H) as a neutralizing agent
An alkaline agent 12 such as No. 2 is added.
中和処理された脱硫排水は供給管１４を介して微粉炭ス
ラリ（ＣｏａｆｆＷ ａ ｔ ｅ ｒ Ｍ ｉ ｘ ｔ
ｕ ｒ ｅ ）製造装置１７に供給される。このＣＷ
Ｍ製造装置１７は微粉炭１５と脱硫排水を混合するとと
もに、薬品１６を混合して、取扱いが容易な微粉炭スラ
リ（ＣＷＭ燃料）を製造する。なお、所定の埋伏のＣＷ
Ｍ燃料を製造するにあたって脱硫排水だけでは不足な場
合がある。この場合は別途工業用水等を補充する。The neutralized desulfurization wastewater is transferred to pulverized coal slurry (CoafWaterMixt) via the supply pipe 14.
u r e ) is supplied to the manufacturing device 17 . This CW
The M production device 17 mixes pulverized coal 15 and desulfurization wastewater, and also mixes chemicals 16 to produce pulverized coal slurry (CWM fuel) that is easy to handle. In addition, the prescribed impaction CW
In producing M fuel, desulfurization wastewater alone may not be sufficient. In this case, add industrial water, etc. separately.
このようにして生成されたＣＷＭ燃料をボイラ１にて燃
焼させると、ＣＷＭ中の水は蒸発され、一方脱硫排水中
の不純物は中和槽１３で添加したアルカリ剤と化合し固
形物となり排ガスに同伴して排出される。この排ガスに
同伴した固形物は電気集じん機２により捕集除去される
。また、電気集じん機２で捕１集しきれなかった固形物
やガス状物質は吸収塔３にて吸収除去される。When the CWM fuel thus generated is combusted in the boiler 1, the water in the CWM is evaporated, while the impurities in the desulfurization wastewater are combined with the alkaline agent added in the neutralization tank 13 and become solids, which are released into the exhaust gas. It is ejected along with it. The solid matter accompanying this exhaust gas is collected and removed by the electrostatic precipitator 2. In addition, solid matter and gaseous substances that cannot be completely collected by the electrostatic precipitator 2 are absorbed and removed by the absorption tower 3.
このようにして、本実施例によれば、湿式排煙脱硫装置
からの排水を格別な排水処理装置で処理する必要がなく
なることから、システム構成が簡単になり、装置が小形
化されるとともに、運転経費が軽減され、経済的な利益
が大きいという効果がある。In this way, according to this embodiment, there is no need to treat the waste water from the wet flue gas desulfurization equipment with a special waste water treatment equipment, so the system configuration is simplified and the equipment is made smaller. The effect is that operating costs are reduced and economic benefits are large.
なお、吸収塔３の手前にベンチュリスクラバ等の湿式除
しん装置を設けた場合、その排水を中和槽１３で中和処
理してＣＷＭのスラリ用水とじて用いることもできる。In addition, when a wet desaturation device such as a Venturi scrubber is provided before the absorption tower 3, the wastewater can be neutralized in the neutralization tank 13 and used as slurry water for CWM.
また、第１図実施例によれば、ＣＷＭ用のスラリ用水（
例えば１００ ｔ／ｈ）としての工業用水を大幅に節約
でき、経済的効果が著しい。Furthermore, according to the embodiment in FIG. 1, slurry water for CWM (
For example, 100 t/h) of industrial water can be saved significantly, and the economic effect is significant.
第２図に本発明の他の実施例を示す。本実施例は脱硫排
水１０のＰＨが低くない場合のシステムであり、第１図
実施例における中和槽１３の処理が省略されている。FIG. 2 shows another embodiment of the invention. This embodiment is a system in which the pH of the desulfurization wastewater 10 is not low, and the treatment in the neutralization tank 13 in the embodiment of FIG. 1 is omitted.
以上説明したように１本発明によれば、湿式排煙処理装
置の排水の少なくとも一部を燃焼装置の燃料に添加する
ようにしていることから、排水処理装置の処理量を軽減
して装置を小形化することができるという効果がある。As explained above, according to the present invention, at least a portion of the wastewater from the wet flue gas treatment device is added to the fuel of the combustion device, thereby reducing the processing amount of the wastewater treatment device and increasing the efficiency of the device. It has the effect of being able to be made smaller.
第１図は本発明の一実施例のシステム構成図、第２図は
本発明の他の実施例のシステム構成図、第３図は従来例
のシステム構成図である。
１・・・ボイラ、２・・・電気集じん機、３・・・吸収
塔、６・・・シラフナ、８・・・シラフナ上澄水、１０
・・・脱硫排水、
１３・・・中和槽、
１７・・・微粉炭スラリ製
造装置。FIG. 1 is a system configuration diagram of one embodiment of the present invention, FIG. 2 is a system configuration diagram of another embodiment of the invention, and FIG. 3 is a system configuration diagram of a conventional example. 1... Boiler, 2... Electrostatic precipitator, 3... Absorption tower, 6... Shirafuna, 8... Shirafuna supernatant water, 10
...Desulfurization wastewater, 13.. Neutralization tank, 17.. Pulverized coal slurry production equipment.
Claims (1)
排煙処理装置とを含んでなる火力プラントシステムにお
いて、湿式排煙処理装置から排出される排水の少なくと
も一部を、前記燃焼装置に供給される燃料に添加して処
理する手段を設けたことを特徴とする湿式排煙処理装置
を備えた火力プラントシステム。1. In a thermal power plant system comprising a combustion device and a wet flue gas treatment device for treating exhaust gas from the combustion device, at least a portion of the wastewater discharged from the wet flue gas treatment device is supplied to the combustion device. What is claimed is: 1. A thermal power plant system equipped with a wet flue gas treatment device, characterized in that it is provided with means for adding and treating fuel to be treated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1091025A JP2805495B2 (en) | 1989-04-11 | 1989-04-11 | Thermal power plant system with wet flue gas treatment equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1091025A JP2805495B2 (en) | 1989-04-11 | 1989-04-11 | Thermal power plant system with wet flue gas treatment equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02268809A true JPH02268809A (en) | 1990-11-02 |
| JP2805495B2 JP2805495B2 (en) | 1998-09-30 |
Family
ID=14014990
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1091025A Expired - Fee Related JP2805495B2 (en) | 1989-04-11 | 1989-04-11 | Thermal power plant system with wet flue gas treatment equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2805495B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5447771A (en) * | 1993-06-30 | 1995-09-05 | E. I. Du Pont De Nemours And Company | Fiber bilobal cross-sections and carpets prepared therefrom having a silk-like luster and soft hand |
| JP2009045521A (en) * | 2007-08-15 | 2009-03-05 | Ihi Corp | Exhaust gas treating method and treatment apparatus |
Families Citing this family (1)
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| CN102620275B (en) * | 2012-03-28 | 2013-11-06 | 浙江省电力公司电力科学研究院 | Commissioning method of bypass-free wet desulphurization system of coal-fired unit by means of tiny-oil ignition |
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1989
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5447771A (en) * | 1993-06-30 | 1995-09-05 | E. I. Du Pont De Nemours And Company | Fiber bilobal cross-sections and carpets prepared therefrom having a silk-like luster and soft hand |
| JP2009045521A (en) * | 2007-08-15 | 2009-03-05 | Ihi Corp | Exhaust gas treating method and treatment apparatus |
Also Published As
| Publication number | Publication date |
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| JP2805495B2 (en) | 1998-09-30 |
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