JPH0691963B2 - Cleaning water circulation method for wet electrostatic precipitator - Google Patents
Cleaning water circulation method for wet electrostatic precipitatorInfo
- Publication number
- JPH0691963B2 JPH0691963B2 JP2532486A JP2532486A JPH0691963B2 JP H0691963 B2 JPH0691963 B2 JP H0691963B2 JP 2532486 A JP2532486 A JP 2532486A JP 2532486 A JP2532486 A JP 2532486A JP H0691963 B2 JPH0691963 B2 JP H0691963B2
- Authority
- JP
- Japan
- Prior art keywords
- electrostatic precipitator
- water
- wet electrostatic
- cleaning water
- circulating water
- 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
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
- B03C3/34—Constructional details or accessories or operation thereof
- B03C3/74—Cleaning the electrodes
- B03C3/78—Cleaning the electrodes by washing
Landscapes
- Electrostatic Separation (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は電極の洗滌水として、新水および一部または全
量の循環水を使用する湿式電気集じん装置の洗滌水循環
方法に関するものである。Description: TECHNICAL FIELD The present invention relates to a cleaning water circulating method for a wet electrostatic precipitator, which uses fresh water and a part or all of circulating water as cleaning water for electrodes.
電気集じん装置の１つに、電極の洗滌水として新水およ
び一部または全量の循環水を使用する湿式電気集じん装
置がある。第３図は、従来から実施されているこの種の
湿式電気集じん装置の洗浄系統の一例を示したものであ
る。第３図において、１は湿式電気集じん装置（内部の
電極等は省略している）、２は湿式電気集じん装置１の
ホッパ部、３は湿式電気集じん装置１排水のPH測定用の
PHタンク、４は排水タンク、５は循環水タンク、６は苛
性ソーダタンク、７は補給水タンク、８は循環水ポン
プ、９はストレーナ、10はブロー水ポンプ、11は苛性ソ
ーダ溶液ポンプ、12は補給水ポンプ、13はかくはん用モ
ータを夫々示すものである。One of the electrostatic precipitators is a wet electrostatic precipitator that uses fresh water and a part or all of circulating water as cleaning water for electrodes. FIG. 3 shows an example of a cleaning system of a wet electrostatic precipitator of this type which has been conventionally implemented. In FIG. 3, 1 is a wet electrostatic precipitator (internal electrodes and the like are omitted), 2 is a hopper portion of the wet electrostatic precipitator 1, and 3 is a pH measurement for the drainage of the wet electrostatic precipitator 1.
PH tank, 4 drainage tank, 5 circulating water tank, 6 caustic soda tank, 7 make-up water tank, 8 circulating water pump, 9 strainer, 10 blow water pump, 11 caustic soda solution pump, 12 supply Water pump and 13 are agitation motors, respectively.
かかる湿式電気集じん装置の運転は、次のように行なっ
ている。すなわち、湿式電気集じん装置１で処理するガ
ス中に，SO2ガスやH2SO4分を含むミストやダスト等酸性
物質を含む場合、循環水のPHがしだいに低下して湿式電
気集じん装置１の内部電極等の腐蝕が激しくなるので、
通常，湿式電気集じん装置１からの排水のPHがPHタンク
３において一定値（例えばPH3〜５）以上となるよう
に、循環水タンク５において苛性ソーダ等のアルカリ分
を添加し,PHを約10以上に高くして湿式電気集じん装置
１にスプレイするようにしている。The wet electrostatic precipitator is operated as follows. That is, when the gas processed by the wet electrostatic precipitator 1 contains an acidic substance such as mist or dust containing SO 2 gas or H 2 SO 4 content, the pH of the circulating water gradually decreases, and the wet electrostatic precipitator collects. Since the internal electrodes of the device 1 are corroded severely,
Usually, in the circulating water tank 5, an alkaline component such as caustic soda is added so that the pH of the wastewater from the wet electrostatic precipitator 1 becomes a certain value (eg, PH3 to 5) or more in the PH tank 3, and the PH is about 10%. The wet electrostatic precipitator 1 is sprayed higher than the above.
ところで、上述の湿式電気集じん装置１を石灰−石こう
法湿式脱硫装置の後硫側へ設置した場合や、供給する新
水中に含まれるCa分が多い場合、あるいは脱硫装置から
キャリオーバしてくるCa分が多い場合には、電気集じん
装置洗滌循環水中のCa濃度が次第に濃縮され、洗滌水PH
が約10以上と高い場合は配管中で石こうが折出力し、電
気集じん装置内に設置した図示しないスプレイノズルを
閉塞させると共に，ストレーナ９の詰りや配管のスケー
リングによって、正常な運転を阻害することがある。そ
こで、従来ではこのような問題を防止するため、湿式電
気集じん装置１に混入するCa分を想定して、循環水中の
Ca濃度を石こうが折出しない範囲にバランスするようブ
ロー水を増加させるようにしている。しかしながら、こ
のような方法では混入するCa濃度が高い場合に、ブロー
水の量が多くなって排水の処理コストが高くなったり、
予想以上のCaの混入があった場合でもブロー水の量が全
体の水バランス上増加できないケースがあり問題となっ
ている。By the way, when the above-mentioned wet electrostatic precipitator 1 is installed on the post-sulfurization side of a lime-gypsum wet desulfurization apparatus, or when a large amount of Ca is contained in the fresh water to be supplied, or when Ca is carried over from the desulfurization apparatus. If there is a large amount of water, the concentration of Ca in the circulating water for cleaning the electrostatic precipitator will gradually increase, and the cleaning water PH
If the value is higher than about 10, gypsum will be broken out in the pipe, block the spray nozzle (not shown) installed in the electrostatic precipitator, block the strainer 9 and hinder normal operation by scaling the pipe. Sometimes. Therefore, conventionally, in order to prevent such a problem, assuming the Ca content mixed in the wet electrostatic precipitator 1,
Blow water is increased to balance the Ca concentration within the range where gypsum does not break out. However, in such a method, when the Ca concentration to be mixed is high, the amount of blow water increases and the wastewater treatment cost increases,
Even if Ca is mixed more than expected, there is a case where the amount of blow water cannot be increased due to the overall water balance, which is a problem.
本発明は上述のような問題点を解決するために成された
もので、その目的はブロー水量の増加等を不要として排
水処理コストの低減化を図りつつ，石こうスケーリング
によるトラブルを防止して連続運転を行なうことが可能
な湿式電気集じん装置の洗滌水循環方法を提供すること
にある。The present invention has been made to solve the above problems, and its purpose is to reduce the wastewater treatment cost without increasing the amount of blow water, etc. It is an object of the present invention to provide a cleaning water circulation method for a wet electrostatic precipitator that can be operated.
上記の目的を達成するために本発明では、電極の洗滌水
として新水および一部または全量の循環水を使用する湿
式電気集じん装置において、洗滌水噴射ノズル圧力を検
出し、その検出値が設定値に達すると一定時間内，循環
水のPHを下げるようにしたことを特徴とする。In order to achieve the above object, in the present invention, in the wet electrostatic precipitator using fresh water and a part or all of circulating water as the cleaning water of the electrode, the cleaning water injection nozzle pressure is detected, and the detected value is The feature is that the PH of the circulating water is lowered within a certain time when the set value is reached.
上述の方法においては、詰り状態が進んで洗滌水噴射ノ
ズル圧力が一定レベルに達した時に、循環水のPHを正常
状態に復帰するまでの一定時間内下げることにより、ス
ケーリングや石こう折出等のトラブルが防止できること
になる。In the above method, when the clogging condition progresses and the cleaning water injection nozzle pressure reaches a certain level, the PH of the circulating water is lowered within a certain period of time until it returns to the normal state, so that scaling or gypsum breakout etc. Trouble can be prevented.
まず、循環水系の詰り程度を把握する１つの手段とし
て、第３図に示したＰ点の圧力（ノズル前圧力）を監視
する方法がある。すなわち、石こう折出による詰りはノ
ズル部で先ず発生する傾向があり、これによってＰ点の
圧力が上昇する。そこで第２図に示すように、正常時の
圧力が 3Kg/cm2ｇのものが２〜３日後約5Kg/cm2ｇに上昇した
際、一時的にPH調整用苛性ソーダの供給を停止して循環
水のPHを７〜８程度に下げたところ、30〜60分程度で折
出した石こうスケールが溶解し、圧力が正常に復帰する
ことが確認された。以上から、定期的に循環水のPHを一
定レベルまで下げてやることにより、連続運転が可能に
なることが明らかである。First, as one means for grasping the degree of clogging of the circulating water system, there is a method of monitoring the pressure at point P (pressure before nozzle) shown in FIG. That is, the clogging due to gypsum breakout tends to occur first in the nozzle portion, which increases the pressure at point P. Therefore, as shown in FIG. 2, when the pressure at the time of normal ones 3 Kg / cm 2 g is increased to about 5Kg / cm 2 g after 2-3 days, and temporarily stopping the supply of the PH adjusting caustic soda When the pH of the circulating water was lowered to about 7 to 8, it was confirmed that the gypsum scale that had broken out in about 30 to 60 minutes dissolved and the pressure returned to normal. From the above, it is clear that continuous operation becomes possible by periodically lowering the pH of the circulating water to a certain level.
以下、上述に基づく本発明の一実施例について説明す
る。An embodiment of the present invention based on the above will be described below.
第１図（ａ）（ｂ）は、本発明による方法を実際に適用
する場合の２つの例を示すものである。第１図（ａ）
は、ノズル前圧力の正常値（図では3Kg/cm2ｇ）に対し
て上限値（図では5Kg/cm2ｇ）を定め、圧力の検出値が
この上限値に達したら、PH調整ポンプ（第３図の11に相
当）の運転を停止し、圧力の検出値が正常値に戻れば再
びPH調整ポンプを正常に運転する方法を示している。1 (a) and 1 (b) show two examples in which the method according to the present invention is actually applied. Fig. 1 (a)
, Once (in FIG. 3 Kg / cm 2 g) normal nozzle before the pressure set upper limit value (5Kg / cm 2 g in the figure) with respect to the detected value of the pressure has reached this limit, PH adjusting pump ( It corresponds to the method of stopping the operation (corresponding to 11 in FIG. 3) and restarting the PH adjustment pump normally when the detected pressure value returns to the normal value.
また第１図（ｂ）は、タイマーによってt2時間正常運転
した後、t1だけ循環水PHをたとえば７〜８程度に下げる
方法を示している。この場合t1，t2の設定は、予めテス
トを行ない石こうスケーリングによる問題発生を防止し
得る安全側に設定するようにしてやればよい。Further, FIG. 1 (b) shows a method of lowering the circulating water PH to, for example, about 7 to 8 for t 1 after a normal operation by the timer for t 2 hours. In this case, t 1 and t 2 should be set in advance on a safe side that can prevent problems due to gypsum scaling by conducting a test in advance.
これら２つの方法とも、循環水のPHを一時的に下げるこ
とにより、湿式電気集じん装置からの排水のPHが低下
し、その間腐蝕の進行が懸念されるが、腐蝕量は時間の
ファクターが大きいため、このような短時間のPH低下は
腐蝕による寿命短縮も許容することができる。In both of these methods, the pH of the drainage from the wet electrostatic precipitator is lowered by temporarily lowering the pH of the circulating water, and there is concern that corrosion will progress during that time, but the amount of corrosion has a large time factor. Therefore, such a decrease in PH for a short time can allow the shortening of the life due to corrosion.
上述したように、本実施例による方法では次のような効
果が得られるものである。As described above, the method according to this embodiment has the following effects.
すなわち、（ａ）従来のようにブロー水量を増加する必
要がないため、湿式電気集じん装置の排水処理上のコス
トを大幅に低減することが可能となる、（ｂ）前述した
ような種々の対策が不要であり、コストアップをほとん
ど伴なわない、という条件下で石こうスケーリングによ
るトラブルを防止し，連続運転を行なうことが可能とな
る。That is, (a) since it is not necessary to increase the amount of blown water as in the conventional case, it is possible to significantly reduce the cost of waste water treatment of the wet electrostatic precipitator, (b) various types of the above-mentioned It is possible to prevent troubles due to gypsum scaling and to perform continuous operation under the condition that no countermeasure is required and there is almost no increase in cost.
尚、本発明は上述した実施例に限定されるものではな
く、その要旨を変更しない範囲で種々に変形して実施す
ることができるものである。It should be noted that the present invention is not limited to the above-described embodiments, but can be modified in various ways without departing from the scope of the invention.
［発明の効果］ 以上説明したように本発明によれば、電極の洗滌水とし
て新水および一部または全量の循環水を使用する湿式電
気集じん装置において、洗滌水噴射ノズル圧力を検出
し、その検出値が設定値に達すると一定時間内，循環水
のPHを下げるようにしたので、ブロー水量の増加等を不
要として排水処理コストの低減化を図りつつ，石こうス
ケーリングによるトラブルを防止し連続運転を行なうこ
とが可能な湿式電気集じん装置の洗滌水循環方法が提供
できる。[Effects of the Invention] As described above, according to the present invention, in the wet electrostatic precipitator using fresh water and a part or all of circulating water as the cleaning water for the electrodes, the cleaning water injection nozzle pressure is detected, When the detected value reaches the set value, the PH of the circulating water is lowered within a certain period of time. Therefore, it is possible to reduce the wastewater treatment cost without increasing the amount of blow water, etc. It is possible to provide a cleaning water circulation method for a wet electrostatic precipitator which can be operated.
第１図（ａ）（ｂ）は本発明による方法の一実施例を説
明するための図、第２図は本発明による実験結果を示す
図、第３図は湿式電気集じん装置の洗滌系統の一例を示
す図である。 １…湿式電気集じん装置、３…PHタンク、４…排水タン
ク、５…循環水タンク、６…苛性ソーダタンク、７…補
給水タンク、８…循環水ポンプ、９…ストレーナ、10…
ブロー水ポンプ、11…苛性ソーダ溶液ポンプ、12…補給
水ポンプ。1 (a) and 1 (b) are views for explaining an embodiment of the method according to the present invention, FIG. 2 is a view showing experimental results according to the present invention, and FIG. 3 is a cleaning system of a wet electrostatic precipitator. It is a figure which shows an example. 1 ... wet electrostatic precipitator, 3 ... PH tank, 4 ... drainage tank, 5 ... circulating water tank, 6 ... caustic soda tank, 7 ... makeup water tank, 8 ... circulating water pump, 9 ... strainer, 10 ...
Blow water pump, 11 ... caustic soda solution pump, 12 ... makeup water pump.
フロントページの続き (56)参考文献 特開 昭59−49856（ＪＰ，Ａ) 特開 昭56−121648（ＪＰ，Ａ) 特開 昭62−180765（ＪＰ，Ａ) 特開 昭52−62784（ＪＰ，Ａ) 特開 昭53−2764（ＪＰ，Ａ) 実開 昭53−62979（ＪＰ，Ｕ)Continuation of front page (56) Reference JP-A-59-49856 (JP, A) JP-A-56-121648 (JP, A) JP-A-62-180765 (JP, A) JP-A-52-62784 (JP , A) Japanese Unexamined Patent Publication No. 53-2764 (JP, A) Actually developed 53-62979 (JP, U)
Claims (1)
全量の循環水を使用する湿式電気集じん装置において、
洗滌水噴射ノズル圧力を検出し、その検出値が設定値に
達すると一定時間内，循環水のPHを下げるようにしたこ
とを特徴とする湿式電気集じん装置の洗滌水循環方法。1. A wet electrostatic precipitator using fresh water and a part or whole amount of circulating water as cleaning water for electrodes,
A cleaning water circulation method for a wet electrostatic precipitator, wherein the cleaning water injection nozzle pressure is detected, and when the detected value reaches a set value, the pH of the circulating water is lowered within a certain period of time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2532486A JPH0691963B2 (en) | 1986-02-07 | 1986-02-07 | Cleaning water circulation method for wet electrostatic precipitator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2532486A JPH0691963B2 (en) | 1986-02-07 | 1986-02-07 | Cleaning water circulation method for wet electrostatic precipitator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62183860A JPS62183860A (en) | 1987-08-12 |
| JPH0691963B2 true JPH0691963B2 (en) | 1994-11-16 |
Family
ID=12162788
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2532486A Expired - Fee Related JPH0691963B2 (en) | 1986-02-07 | 1986-02-07 | Cleaning water circulation method for wet electrostatic precipitator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0691963B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62140953U (en) * | 1986-02-28 | 1987-09-05 | ||
| AU2022382441B2 (en) | 2021-11-05 | 2025-02-27 | Mitsubishi Kakoki Kaisha,Ltd. | Filtration device, and filtration system |
-
1986
- 1986-02-07 JP JP2532486A patent/JPH0691963B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62183860A (en) | 1987-08-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |