JPH0638926B2 - Exhaust gas treatment method from coal-fired boiler - Google Patents
Exhaust gas treatment method from coal-fired boilerInfo
- Publication number
- JPH0638926B2 JPH0638926B2 JP2532886A JP2532886A JPH0638926B2 JP H0638926 B2 JPH0638926 B2 JP H0638926B2 JP 2532886 A JP2532886 A JP 2532886A JP 2532886 A JP2532886 A JP 2532886A JP H0638926 B2 JPH0638926 B2 JP H0638926B2
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- coal
- fired boiler
- dry
- gas treatment
- 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 - Lifetime
Links
- 238000000034 method Methods 0.000 title claims description 16
- 239000002351 wastewater Substances 0.000 claims description 9
- 239000012718 dry electrostatic precipitator Substances 0.000 claims description 5
- 239000012719 wet electrostatic precipitator Substances 0.000 claims description 5
- 239000003245 coal Substances 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 40
- 239000000428 dust Substances 0.000 description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 238000003795 desorption Methods 0.000 description 6
- 238000002347 injection Methods 0.000 description 6
- 239000007924 injection Substances 0.000 description 6
- 230000007423 decrease Effects 0.000 description 5
- 239000011734 sodium Substances 0.000 description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000003546 flue gas Substances 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 239000003513 alkali Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 239000012717 electrostatic precipitator Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 238000002407 reforming Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 150000003388 sodium compounds Chemical class 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/01—Pretreatment of the gases prior to electrostatic precipitation
- B03C3/013—Conditioning by chemical additives, e.g. with SO3
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Chimneys And Flues (AREA)
- Treating Waste Gases (AREA)
- Electrostatic Separation (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、石炭焚ボイラの排煙処理システムにおける除
塵性能を向上するための排ガス処理方法に関する。Description: TECHNICAL FIELD The present invention relates to an exhaust gas treatment method for improving dust removal performance in a flue gas treatment system of a coal-fired boiler.
石炭焚ボイラからの排煙処理は、従来第３図に示すシル
テムを用いて行なわれている。即ち、ボイラ１からは一
般に350℃程度の排ガスが排出される。この排ガスは空
気余熱器２で燃焼用空気と熱交換され、130℃程度に冷
却されて乾式電気集塵器（乾式ＥＰ）３に導入される。
乾式ＥＰ３で除塵された排ガスは、ガス−ガス熱交換器
４で再び熱交換されて約100℃程度にまで冷却された
後、排煙脱硫装置（排脱装置）５，６でＳＯｘの吸収が
行なわれ、ここで排ガスの温度は約60℃程度にまで低下
する。脱硫された排ガスは湿式電気集塵器（湿式ＥＰ）
７に導入され、再びダスト及びミスト等が除塵される。
湿式ＥＰを出た排ガスは、ガス−ガス熱交換器８で熱交
換され、白煙防止のために約100℃程度に昇温された上
で煙突９から大気中に放出される。The flue gas treatment from a coal-fired boiler has been conventionally performed using a siltem shown in FIG. That is, exhaust gas of about 350 ° C. is generally discharged from the boiler 1. This exhaust gas is heat-exchanged with the combustion air in the air preheater 2, cooled to about 130 ° C., and introduced into the dry electrostatic precipitator (dry EP) 3.
The exhaust gas dedusted by the dry type EP3 is again heat-exchanged by the gas-gas heat exchanger 4 and cooled down to about 100 ° C., and then the SOx absorption by the flue gas desulfurization devices (exhaust desorption devices) 5, 6 The temperature of the exhaust gas is reduced to about 60 ° C. The desulfurized exhaust gas is a wet electrostatic precipitator (wet EP)
Introduced in 7, the dust and mist are removed again.
The exhaust gas emitted from the wet EP is heat-exchanged by the gas-gas heat exchanger 8, heated to about 100 ° C. to prevent white smoke, and then discharged from the chimney 9 to the atmosphere.
ところで、ボイラ１から排出される排ガスは石炭の種類
によってダストの性状が異なり、また排ガスの電気抵抗
率は温度によって変動する。これらの要素は上記の排ガ
ス処理システムにおける乾式ＥＰの集塵器性能に多大の
影響を与える。By the way, the exhaust gas discharged from the boiler 1 has different dust properties depending on the type of coal, and the electrical resistivity of the exhaust gas varies depending on the temperature. These factors have a great influence on the dust collector performance of the dry EP in the above exhaust gas treatment system.
第４図に示したように、一般に乾式ＥＰの集塵効率は排
ガスの電気抵抗率（Ω・cm）が高くなるほど低下する。
また、排ガスの電気抵抗率はダスト中のアルカリ成分の
含有量が高いほど低く、所定の温度範囲では温度の上昇
に伴って高くなる。従って、乾式ＥＰの集塵効率を高め
るためには、排ガス中のアルカリ成分含有率（主にナト
リウム）が高く、また温度が低い方が望ましい。As shown in FIG. 4, the dust collection efficiency of dry EP generally decreases as the electric resistivity (Ω · cm) of exhaust gas increases.
Further, the electrical resistivity of the exhaust gas becomes lower as the content of the alkaline component in the dust becomes higher, and becomes higher in the predetermined temperature range as the temperature rises. Therefore, in order to improve the dust collection efficiency of the dry EP, it is desirable that the content of alkali components (mainly sodium) in the exhaust gas is high and the temperature is low.
そこで、乾式ＥＰの集塵効率を高める方法として、煙道
注水により排ガス温度を調整すると同時にダストを調湿
する方法、或いはアルカリ成分（主にナトリウム化合
物）をボイラ炉内または煙道内に注入してダストを改質
する方法が夫々個々的に行なわれている。Therefore, as a method of increasing the dust collection efficiency of the dry EP, a method of adjusting the exhaust gas temperature by flue water injection and simultaneously controlling the humidity of the dust, or injecting an alkaline component (mainly a sodium compound) into the boiler furnace or the flue Each method of modifying dust is individually performed.
上記従来の方法では、乾式ＥＰの集塵効率向上に有効な
二つの方法が個々的に行なわれているため、その効果が
充分に発揮されていない問題がある。また、その両者を
単に独立に併用しただけでは、排ガス処理システムにお
ける経済性の要請を満たせないことになる。In the above-mentioned conventional method, since two methods effective for improving the dust collecting efficiency of the dry EP are individually performed, there is a problem that the effect is not sufficiently exhibited. Further, simply using both of them independently cannot satisfy the demand for economy in the exhaust gas treatment system.
そこで、本発明は排ガス処理システムで乾式ＥＰの集塵
効率向上のために従来行なわれている二つの方法を統一
的に併用し、経済的に処理効率を高めることができる方
法を提供しようとするものである。Therefore, the present invention intends to provide a method capable of economically increasing the treatment efficiency by integrally using two methods conventionally used for improving the dust collection efficiency of a dry EP in an exhaust gas treatment system. It is a thing.
本発明では石炭焚ボイラからの排ガス処理システムを構
成する湿式ＥＰに着目し、これに使用されているアルカ
リ成分量の多い排水を有効に利用することによって、乾
式ＥＰの集塵効率向上のために従来行なわれている二つ
の方法を統一的かつ経済的に併用することを可能とした
ものである。In the present invention, attention is paid to a wet EP that constitutes an exhaust gas treatment system from a coal-fired boiler, and by effectively utilizing wastewater having a large amount of alkaline components used therein, in order to improve the dust collection efficiency of a dry EP. This makes it possible to use the two conventional methods in a unified and economical manner.
即ち、本発明による石炭焚ボイラからの排ガス処理方法
は、乾式電気集塵器で排ガス中の固形分を除去した後、
更に湿式電気集塵器で除去する石炭焚ボイラからの排ガ
ス処理方法において、アルカリ成分を含んだ湿式電気集
塵器からの排水を乾式電気集塵器の前の煙道内に噴霧注
入することを特徴とするものである。That is, the method for treating exhaust gas from a coal-fired boiler according to the present invention, after removing the solid content in the exhaust gas with a dry electrostatic precipitator,
Further, in a method for treating exhaust gas from a coal-fired boiler to be removed by a wet electrostatic precipitator, drainage from the wet electrostatic precipitator containing an alkaline component is spray-injected into the flue in front of the dry electrostatic precipitator. It is what
湿式ＥＰでは排水中に含まれるＳＯ３の中和剤としてＮ
ａＯＨ等のアルカリ剤を添加しているから、その排水は
アルカリリッチになっている。従って、この湿式ＥＰの
排水を用いることによって、アルカリ剤を別途使用する
ことなく、ガス温度低下させるための注水とアルカリ添
加による排ガスの改質とを同時に達成し、乾式ＥＰの集
塵効率を顕著に向上することができる。In wet EP, N is used as a neutralizing agent for SO 3 contained in wastewater.
Since an alkaline agent such as aOH is added, the wastewater is rich in alkali. Therefore, by using the waste water of this wet EP, it is possible to achieve water injection for lowering the gas temperature and reforming of the exhaust gas by addition of alkali at the same time without separately using an alkaline agent, and to significantly improve the dust collection efficiency of dry EP. Can be improved.
また、湿式ＥＰからの排水の一部（フロー水）は、通常
は冷却水として排脱装置の冷却塔に循環されるから、そ
の一部を分岐して煙道注水に利用できる。従って、新た
に水を補給しなくても水および熱の収支上は何等問題な
い。In addition, since a part of the drainage (flow water) from the wet EP is normally circulated as cooling water to the cooling tower of the exhaust / desorption device, a part thereof can be branched and used for flue water injection. Therefore, there is no problem in terms of the balance of water and heat without supplying new water.
なお、注水源として排脱装置からの排水を使用すること
も考えられるが、一部の排脱方式では排水がＣａリッチ
であるため、これを乾式ＥＰの上流に注水するとダスト
の電気抵抗率を逆に高める傾向にある。従って、ガス温
度の低下による集塵性の向上を相殺してしまうため、本
発明では特に湿式ＥＰからの排水を利用することにした
ものである。Although it is possible to use the drainage from the drainage device as a water injection source, since the drainage is Ca-rich in some drainage methods, if this is poured upstream of the dry EP, the electrical resistivity of the dust will be reduced. On the contrary, it tends to increase. Therefore, since the improvement of the dust collecting property due to the decrease of the gas temperature is offset, the present invention uses the waste water from the wet EP in particular.
第１図は、本発明による排ガス処理方法の一実施例を示
すフローチャートである。同図において、１は石炭焚ボ
イラ、２は空気余熱器、３は乾式ＥＰ、４はガス−ガス
熱交換器、５は排脱装置の冷却塔、６は排脱措置の吸収
塔、７は湿式ＥＰ、８はガス−ガス熱交換器、９は煙突
であり、これらは従来の排ガス処理システムに用いられ
ているものと同じで、ボイラ１からの排ガスは矢印に従
って順次処理された上で煙突９から大気中に放出され
る。その際、この実施例では湿式ＥＰからライン１１及
びバルブ１０１を通って排脱装置の冷却塔５に循環され
る排水の一部を分岐し、ライン１２及びバルブ１０２を
通して乾式ＥＰ３に導入される直前の煙道排ガス中に注
入する。その注入量はボイラ負荷、排ガスの温度、石炭
の種類等に応じ、調整弁１０１，１０２の開度を調整し
て制御する。また、ＥＰ出口や煙突入口等に設置された
煤塵濃度計の指示値変化基いて同様に流量を制御するこ
とも可能である。なお、湿式ＥＰ排水中のアルカリ分が
不足する場合には、湿式ＥＰ中に導入される工水にＮａ
ＯＨを添加補給すればよい。FIG. 1 is a flow chart showing an embodiment of the exhaust gas treatment method according to the present invention. In the figure, 1 is a coal-fired boiler, 2 is an air preheater, 3 is a dry EP, 4 is a gas-gas heat exchanger, 5 is a cooling tower of an exhaust / desorption device, 6 is an absorption tower of an exhaust / desorption device, and 7 is Wet EP, 8 is a gas-gas heat exchanger, and 9 is a chimney. These are the same as those used in the conventional exhaust gas treatment system. Exhaust gas from the boiler 1 is sequentially treated according to the arrow and then the chimney. 9 is released into the atmosphere. At this time, in this embodiment, a part of the waste water circulated from the wet EP through the line 11 and the valve 10 1 to the cooling tower 5 of the exhaust device is branched and introduced into the dry EP 3 through the line 12 and the valve 10 2. Inject into the flue gas just before The injection amount is controlled by adjusting the openings of the adjusting valves 10 1 and 10 2 according to the boiler load, the temperature of exhaust gas, the type of coal, and the like. It is also possible to control the flow rate in the same manner based on the change in the indicated value of the dust concentration meter installed at the EP outlet or the chimney inlet. If the alkaline content in the wet EP wastewater is insufficient, the working water introduced into the wet EP will have Na.
OH may be added and supplemented.
上記実施例の方法における作用および効果を説明すれば
次の通りである。The operation and effect of the method of the above embodiment will be described below.
第２図は、代表的なアルカリ化合物であるＮａ化合物の
水溶液を噴霧した時のダスト電気抵抗率の特性変化例
を、無噴霧時の特性変化と比較して示す線図である。図
示のように、無噴霧時の運転ダスト電器抵抗率が図中Ａ
で示されるのに対し、これにＮａ水溶液を噴霧した時の
ダスト電器抵抗率特性は、Ｎａ分添加の寄与によって図
中Ｂ′にまで低下し、更に注水によるガス温度低下の寄
与により図中Ｂに示す値にまで移動する。この場合の電
気抵抗率の低下幅は１０〜１０２Ωcm程度である。この
結果から明らかなように、上記実施例によれば乾式ＥＰ
７における集塵効率を顕著に向上することができる。効
率の向上幅は、使用する石炭の種類およびガス条件によ
って異なる。FIG. 2 is a diagram showing a characteristic change example of the dust electric resistivity when an aqueous solution of a Na compound, which is a typical alkaline compound, is sprayed, in comparison with a characteristic change in the absence of spraying. As shown in the figure, the operating dust electric appliance resistivity without spray is A in the figure.
On the other hand, the dust electric resistivity characteristic when sprayed with an aqueous Na solution decreases to B ′ in the figure due to the contribution of Na content addition, and B in the figure due to the contribution of the decrease in gas temperature due to water injection. Move to the value shown in. In this case, the range of decrease in electrical resistivity is about 10 to 10 2 Ωcm. As is clear from this result, according to the above embodiment, the dry EP
The dust collection efficiency in 7 can be remarkably improved. The extent of improvement in efficiency depends on the type of coal used and gas conditions.
また、排ガスシステム中で実際に発生する排水を用いて
実施しているから、特別にコストが増大することはな
く、極めて経済的である。Further, since the waste water actually generated in the exhaust gas system is used for the implementation, the cost is not particularly increased and it is extremely economical.
以上詳述したように、本発明によれば石炭焚ボイラから
の排ガス処理システムに用いられている乾式電気集塵器
の集塵効率を顕著に向上でき、且つ極めて経済的である
等、顕著な効果が得られるものである。As described in detail above, according to the present invention, the dust collection efficiency of the dry type electrostatic precipitator used in the exhaust gas treatment system from the coal-fired boiler can be remarkably improved, and it is extremely economical. The effect can be obtained.
【図面の簡単な説明】 第１図は本発明による排ガス処理方法の一実施例を示す
フローチャート、第２図は石炭炊きボイラ排ガス中にＮ
ａ化合物を含む水溶液を噴霧したときのダスト電器抵抗
率変化を示す線図、第３図は石炭炊きボイラに従来用い
られている排ガス処理システムの説明図、第４図は排ガ
スダスト電気抵抗率と乾式ＥＰの集塵効率との関係を示
す線図である。 １……石炭焚ボイラ、２……空気余熱器、３……乾式Ｅ
Ｐ、４，８……ガス−ガス熱交換器、５……排脱装置の
冷却塔、６……排脱装置の吸収塔、７……湿式ＥＰ、９
……煙突、１０１，１０２……流量調整弁BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flow chart showing an embodiment of an exhaust gas treatment method according to the present invention, and FIG. 2 is a flow chart showing N in the exhaust gas of a coal-fired boiler.
A diagram showing a change in dust electric appliance resistivity when an aqueous solution containing a compound is sprayed, FIG. 3 is an explanatory diagram of an exhaust gas treatment system conventionally used in a coal-fired boiler, and FIG. 4 is an exhaust gas dust electrical resistivity. It is a diagram which shows the relationship with the dust collection efficiency of dry EP. 1 ... Coal-fired boiler, 2 ... Air preheater, 3 ... Dry type E
P, 4, 8 ... Gas-gas heat exchanger, 5 ... Cooling tower for exhaust / desorption device, 6 ... Absorption tower for exhaust / desorption device, 7 ... Wet EP, 9
...... Chimney 10 1 , 10 2 ...... Flow rate control valve
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｂ０３Ｃ 3/16 ＺＡＢ Ｚ 8925−4Ｄ (72)発明者 尾谷 英彦 兵庫県神戸市兵庫区和田崎町１丁目１番１ 号 三菱重工業株式会社神戸造船所内 (56)参考文献 特開 昭54−77279（ＪＰ，Ａ) 特開 昭60−156563（ＪＰ，Ａ)─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification number Internal reference number FI Technical display location B03C 3/16 ZAB Z 8925-4D (72) Inventor Hidehiko Otani Wadazaki Town, Hyogo Ward, Kobe City, Hyogo Prefecture 1-1-1 Mitsubishi Heavy Industries, Ltd. Kobe Shipyard (56) Reference JP 54-77279 (JP, A) JP 60-156563 (JP, A)
Claims (1)
した後、更に湿式電気集塵器で除去する石炭焚ボイラか
らの排ガス処理方法において、アルカリ成分を含んだ湿
式電気集塵器からの排水を乾式電気集塵器の前の煙道内
に噴霧注入することを特徴とする石炭焚ボイラからの排
ガス処理方法。1. A method for treating exhaust gas from a coal-fired boiler, in which solids in exhaust gas are removed by a dry electrostatic precipitator and then removed by a wet electrostatic precipitator, a wet electrostatic precipitator containing an alkaline component. A method of treating exhaust gas from a coal-fired boiler, characterized in that the wastewater from the coal is injected into the flue in front of the dry electrostatic precipitator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2532886A JPH0638926B2 (en) | 1986-02-07 | 1986-02-07 | Exhaust gas treatment method from coal-fired boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2532886A JPH0638926B2 (en) | 1986-02-07 | 1986-02-07 | Exhaust gas treatment method from coal-fired boiler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62183859A JPS62183859A (en) | 1987-08-12 |
| JPH0638926B2 true JPH0638926B2 (en) | 1994-05-25 |
Family
ID=12162879
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2532886A Expired - Lifetime JPH0638926B2 (en) | 1986-02-07 | 1986-02-07 | Exhaust gas treatment method from coal-fired boiler |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0638926B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07110109A (en) * | 1993-10-13 | 1995-04-25 | Mitsubishi Heavy Ind Ltd | Dry type simplified desulfurizer |
| CN1296655C (en) * | 2004-09-10 | 2007-01-24 | 南京东大能源环保科技有限公司 | Apparatus and method for treating incineration exhaust gas of dry-wet mixed solid waste |
| JP2007326079A (en) * | 2006-06-09 | 2007-12-20 | Mhi Environment Engineering Co Ltd | Flue gas treatment system and method of coal burning boiler |
| JP4853737B2 (en) * | 2008-02-22 | 2012-01-11 | 株式会社日立プラントテクノロジー | Exhaust gas treatment method and apparatus |
-
1986
- 1986-02-07 JP JP2532886A patent/JPH0638926B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62183859A (en) | 1987-08-12 |
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| EXPY | Cancellation because of completion of term |