JP2805495B2 - Thermal power plant system with wet flue gas treatment equipment - Google Patents
Thermal power plant system with wet flue gas treatment equipmentInfo
- Publication number
- JP2805495B2 JP2805495B2 JP1091025A JP9102589A JP2805495B2 JP 2805495 B2 JP2805495 B2 JP 2805495B2 JP 1091025 A JP1091025 A JP 1091025A JP 9102589 A JP9102589 A JP 9102589A JP 2805495 B2 JP2805495 B2 JP 2805495B2
- Authority
- JP
- Japan
- Prior art keywords
- flue gas
- gas treatment
- power plant
- thermal power
- wet
- 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 - Fee Related
Links
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims description 19
- 239000003546 flue gas Substances 0.000 title claims description 19
- 239000002351 wastewater Substances 0.000 claims description 17
- 239000007789 gas Substances 0.000 claims description 15
- 238000002485 combustion reaction Methods 0.000 claims description 10
- 239000000446 fuel Substances 0.000 claims description 8
- 238000006477 desulfuration reaction Methods 0.000 description 15
- 230000023556 desulfurization Effects 0.000 description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 15
- 238000010521 absorption reaction Methods 0.000 description 14
- 239000002002 slurry Substances 0.000 description 12
- 239000000428 dust Substances 0.000 description 8
- 239000002562 thickening agent Substances 0.000 description 8
- 238000004065 wastewater treatment Methods 0.000 description 8
- 238000006386 neutralization reaction Methods 0.000 description 6
- 239000003250 coal slurry Substances 0.000 description 5
- 239000007787 solid Substances 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
- 230000000694 effects Effects 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
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000006228 supernatant Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 230000002745 absorbent Effects 0.000 description 3
- 239000002250 absorbent Substances 0.000 description 3
- 239000003513 alkali Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 239000000460 chlorine Substances 0.000 description 3
- 239000003245 coal 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
- 239000007788 liquid Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 2
- 229910052801 chlorine Inorganic materials 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
- 239000000203 mixture Substances 0.000 description 2
- 239000012716 precipitator 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
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 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
- 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
- 230000003472 neutralizing effect Effects 0.000 description 1
- 238000010979 pH adjustment Methods 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
- 239000004071 soot Substances 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
Landscapes
- Chimneys And Flues (AREA)
- Treating Waste Gases (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
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。Description: TECHNICAL FIELD The present invention relates to a thermal power plant system provided with a wet-type flue gas treatment device, and more particularly to a thermal power plant system suitable for treating waste water 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, a wet flue gas desulfurization device based on a wet limestone-gypsum method has been widely used 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、硫黄酸化分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。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。A wet-type flue gas desulfurization apparatus applied to coal-fired boiler exhaust gas not only removes sulfur oxides and dust, but also absorbs and removes halogen gas in the exhaust gas. FIG. 3 shows an exhaust gas treatment apparatus for such a boiler. As shown in the drawing, the exhaust gas from the boiler 1 is firstly subjected to dust removal in a normal dry dust collector 2. Thereafter, the mixture is guided to the absorption tower 3 to remove sulfur dioxide and halogen compounds, and soot that cannot be removed by the dry dust collector 2 is 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
水とシックナ６のシックナ上澄水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、シックナ６のシックナ上澄水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, whereby water in the slurry evaporates. Then, fresh industrial water and thickener supernatant water 8 of thickener 6 are supplied to the absorption tower 3 from the absorption tower return line 9 in order to supplement the evaporated water. On the other hand, the halogen compound (mainly chloride) absorbed in the slurry is concentrated in the system due to its high solubility, causing corrosion of the stainless steel material. Therefore, in order to prevent corrosion, a part of the thickener supernatant water 8 of the thickener 6 is continuously withdrawn from the absorption tower return line 9 so that the chlorine concentration in the system becomes a certain value or less. The extracted desulfurization effluent 10 cannot be directly discharged out of the system because it contains not only chlorine but also fluorine which has been similarly absorbed and COD-derived substances by-produced in the system. Therefore, a wastewater treatment device is provided.
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（S2O6 2-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。However, in general, wastewater treatment in a wet flue gas treatment device such as a wet flue gas desulfurization device requires a large amount of wastewater to be treated and removes various substances, and requires adjustment of PH and the like. There is a problem that the process becomes large and complicated. For example, the above wastewater treatment device
Treatment at 20 is usually after removing solids in the wastewater,
Alkali (Ca salt, Na salt) was added and the like to remove the fluorine compound, so that the pH adjustment was removed by subsequent COD caused material (S 2 O 6 2-, etc.) ion adsorption resin.
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。SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art, in other words, to provide a thermal power plant system equipped with a wet-type flue gas treatment apparatus capable of reducing the amount of treatment of a wastewater treatment apparatus and downsizing the apparatus. Is to do.
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, in a thermal power plant system including a combustion device and a wet flue gas treatment device for treating exhaust gas of the combustion device, at least wastewater discharged from the wet flue gas treatment device. It is characterized in that a part is added to the fuel supplied to the combustion device for processing.
このような構成とするとにより、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が可能になる。With this configuration, at least a part of the waste water of the wet-type flue gas treatment device added to the fuel is evaporated in the combustion device, and the contained material is guided to the wet-type flue gas treatment device together with the exhaust gas, and the absorbent is used. Absorption removal by slurry or the like is repeatedly performed. As a result, the amount of wastewater discharged out of the system is reduced, and the wastewater treatment device can be downsized.
また、燃焼装置の燃料として微粉炭スラリが用いられ
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、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。In addition, in a thermal power plant system in which pulverized coal slurry is used as fuel for a combustion device, a large amount of water is generally used as a liquid for pulverized coal slurry. It is desirable to apply the wastewater as a slurry liquid or as a part thereof. According to this, the entire amount of the wastewater can be used as slurry water, and no special wastewater treatment is required, and industrial water as slurry water can be largely 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。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。In addition, depending on the system configuration of the wet type flue gas treatment device,
In some cases, dust and halogen gas in exhaust gas are removed by water spray or the like in front of an absorption tower of a desulfurization device. Since the wastewater in this case has a low PH, it is preferable to add an alkali and neutralize the wastewater in order to use it as slurry water for pulverized coal. However, in the case of a system in which the above dust and halogen gas are removed simultaneously in the flue gas desulfurization absorption tower, the PH of the desulfurization effluent generated from the absorption tower is not very low. Can be used 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 described 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。吸収塔３から抜出された石膏を含有する吸収液はシ
ックナ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。FIG. 1 shows a configuration diagram of an embodiment of a thermal power plant system to which the present invention is applied. The components having the same functions and the same configuration as those in FIG. 3 are denoted by the same reference numerals, and description thereof is omitted. The gypsum-containing absorption liquid extracted from the absorption tower 3 is guided to the thickener 6, where most of the solid matter (mainly gypsum) is separated and removed. The separated gypsum 11 is dehydrated by the dehydrator 7 and discharged.
一方、シックナ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（OH）２等のアル
カリ剤12が添加されるようになっている。中和処理され
た脱硫排水は供給間14を介して微粉炭スラリ（Coal Wat
er Mixture）製造装置17に供給される。このCWM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、所定の性状のCWM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。On the other hand, a part of the supernatant water 8 of the thickener 6 is withdrawn as desulfurization wastewater 10 and led to a neutralization tank 13 where neutralization treatment is performed. As a neutralizing agent, an alkaline agent 12 such as NaOH or Ca (OH) 2 is added. The neutralized desulfurization effluent is supplied to pulverized coal slurry (Coal Wat
er Mixture) is supplied to the manufacturing apparatus 17. This CWM production equipment 17 mixes pulverized coal 15 with desulfurization wastewater,
Pulverized coal slurry (CWM fuel) that is easy to handle
To manufacture. In some cases, desulfurization effluent alone is not enough to produce CWM fuel of a predetermined property. In this case, replenish 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 thus produced CWM fuel is burned in the boiler 1, the water in the CWM is evaporated, while the impurities in the desulfurization effluent are combined with the alkali agent added in the neutralization tank 13 to become solids and become exhaust gas. It is discharged with accompanying. Solid matter accompanying the exhaust gas is collected and removed by the electric precipitator 2. The solids and gaseous substances that cannot be collected by the electric 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 the present embodiment, the wastewater from the wet flue gas desulfurization device does not need to be treated by a special wastewater treatment device, so that the system configuration is simplified and the device is downsized. This has the effect of reducing operating costs and increasing economic benefits.
なお、吸収塔３の手前にベンチュリスクラバ等の湿式
除じ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のスラリ用水として用いることもできる。When a wet dust removal device such as a venturi scrubber is provided in front of 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100t/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。In addition, according to the embodiment of FIG. 1, industrial water as slurry water for CWM (for example, 100 t / h) can be largely saved,
Economic effect is remarkable.
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が低くなる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 present invention. This embodiment is a system in the case where the pH of the desulfurization wastewater 10 becomes low, and the treatment of the neutralization tank 13 in the embodiment of FIG. 1 is omitted.
以上説明したように、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 described above, according to the present invention, since at least a part of the waste water of the wet-type flue gas treatment device is added to the fuel of the combustion device, the treatment amount of the waste water treatment device is reduced and the device is reduced. There is an effect that the size can be reduced.
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
……シックナ、８……シックナ上澄水、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 present invention, and FIG. 3 is a system configuration diagram of a conventional example. 1 ... boiler, 2 ... electric dust collector, 3 ... absorption tower, 6
... thickener, 8 ... thickener supernatant water, 10 ... desulfurization drainage, 13 ... neutralization tank, 17 ... pulverized coal slurry production equipment.
フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) B01D 53/50 C02F 1/02 F23J 15/00Continuation of front page (58) Field surveyed (Int.Cl. 6 , DB name) B01D 53/50 C02F 1/02 F23J 15/00
Claims (1)
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湿式排煙
処理装置を備えた火力プラントシステム。1. A thermal power plant system comprising a combustion device and a wet flue gas treatment device for treating exhaust gas from the combustion device, wherein at least a part of the waste water discharged from the wet flue gas treatment device is subjected to the combustion. A thermal power plant system provided with a wet-type flue gas treatment device, characterized by comprising means for adding and treating the fuel supplied to the device.
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 JPH02268809A (en) | 1990-11-02 |
| JP2805495B2 true 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 (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102620275A (en) * | 2012-03-28 | 2012-08-01 | 浙江省电力试验研究院 | Commissioning method of bypass-free wet desulphurization system of coal-fired unit by means of tiny-oil ignition |
Families Citing this family (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 |
| JP5299600B2 (en) * | 2007-08-15 | 2013-09-25 | 株式会社Ｉｈｉ | Exhaust gas treatment method and exhaust gas treatment apparatus |
-
1989
- 1989-04-11 JP JP1091025A patent/JP2805495B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102620275A (en) * | 2012-03-28 | 2012-08-01 | 浙江省电力试验研究院 | Commissioning method of bypass-free wet desulphurization system of coal-fired unit by means of tiny-oil ignition |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02268809A (en) | 1990-11-02 |
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