JPH07251021A - Exhaust gas treating apparatus with bag filter - Google Patents
Exhaust gas treating apparatus with bag filterInfo
- Publication number
- JPH07251021A JPH07251021A JP6042212A JP4221294A JPH07251021A JP H07251021 A JPH07251021 A JP H07251021A JP 6042212 A JP6042212 A JP 6042212A JP 4221294 A JP4221294 A JP 4221294A JP H07251021 A JPH07251021 A JP H07251021A
- Authority
- JP
- Japan
- Prior art keywords
- dust
- gas
- bag filter
- filter
- layer
- 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.)
- Pending
Links
- 239000000428 dust Substances 0.000 claims abstract description 48
- 239000004744 fabric Substances 0.000 claims abstract description 26
- 238000007599 discharging Methods 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims description 5
- 239000007789 gas Substances 0.000 abstract description 74
- 230000002378 acidificating effect Effects 0.000 abstract description 17
- 239000000126 substance Substances 0.000 abstract description 15
- 238000005507 spraying Methods 0.000 abstract description 5
- 238000005260 corrosion Methods 0.000 abstract description 3
- 230000007797 corrosion Effects 0.000 abstract description 3
- 239000002341 toxic gas Substances 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 56
- 239000003814 drug Substances 0.000 description 28
- 238000001914 filtration Methods 0.000 description 27
- 229940079593 drug Drugs 0.000 description 23
- 239000000567 combustion gas Substances 0.000 description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 18
- 239000007921 spray Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 238000001514 detection method Methods 0.000 description 6
- 238000006386 neutralization reaction Methods 0.000 description 6
- 238000009423 ventilation Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000004071 soot Substances 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 239000013043 chemical agent Substances 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 230000003472 neutralizing effect Effects 0.000 description 2
- 239000011800 void material Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000010789 controlled waste Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 150000002013 dioxins Chemical class 0.000 description 1
- 238000012377 drug delivery Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 235000011121 sodium hydroxide Nutrition 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/0027—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions
- B01D46/0035—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions by wetting, e.g. using surfaces covered with oil
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2273/00—Operation of filters specially adapted for separating dispersed particles from gases or vapours
- B01D2273/12—Influencing the filter cake during filtration using filter aids
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、焼却炉の排ガスから有
害ガス及びばいじん等を除去するバグフィルタ装置に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bag filter device for removing harmful gas and dust from exhaust gas from an incinerator.
【０００２】[0002]
【従来の技術】現在実用に供されている焼却炉または燃
焼炉用バグフィルタ装置のうち、最も多く採用されてい
るものは、酸性ガス中和及び濾過作業を司る薬剤を排ガ
ス中に同伴させて濾布上に付着せしめ、運転の継続とと
もに濾布上に堆積したばいじん及び薬剤等からなる粉じ
ん層を、パルスジェット方式で払い落すシステムであ
り、本方式を従来技術の代表例として説明する。2. Description of the Related Art Among the bag filter devices for incinerators or combustion furnaces that are currently in practical use, the most widely used one is to carry a chemical agent for acid gas neutralization and filtration work together with the exhaust gas. This is a system for removing the dust layer made of dust and chemicals deposited on the filter cloth by adhering it on the filter cloth and continuing the operation by a pulse jet method. This method will be described as a typical example of the prior art.
【０００３】図６は、上述のバグフィルタによる排ガス
処理装置の概略構成を示す図であり、図７は濾過作業中
の濾布周辺部を示す拡大図である。FIG. 6 is a diagram showing a schematic structure of an exhaust gas treating apparatus using the above-mentioned bag filter, and FIG. 7 is an enlarged view showing a filter cloth peripheral portion during a filtering operation.
【０００４】ごみ焼却時において、図示しない焼却炉で
発生した高温の燃焼ガス中には、酸性有害ガスａやばい
じんｂ等を含んでおり、公害防止上、これらを除去する
必要がある。At the time of incineration of refuse, high temperature combustion gas generated in an incinerator (not shown) contains acidic harmful gas a, dust b, etc., and it is necessary to remove them in order to prevent pollution.
【０００５】従って、図示しないガス冷却装置及び空気
予熱器等からなるガス冷却手段により上記高温の燃焼ガ
スを冷却して低温の燃焼ガスｄとした後、該燃焼ガスｄ
中に、図示しない薬剤貯留装置から空送される酸性有害
ガス中和用の薬剤ｃを噴射・混合せしめて排ガスｇとな
し、排ガスダクトｅを通じてバグフィルタ装置（中和・
除じん装置）ｆに導入する。Therefore, after the high temperature combustion gas is cooled to a low temperature combustion gas d by a gas cooling means including a gas cooling device and an air preheater (not shown), the combustion gas d is obtained.
Inside, a chemical c for neutralizing acidic harmful gas, which is fed from a chemical storage device (not shown), is injected and mixed to form an exhaust gas g, and a bag filter device (neutralization / neutralization
It is installed in the dust removal device) f.
【０００６】バグフィルタ装置ｆ内には、多数の濾布ｆ
1 が懸架されており、燃焼ガスｄに同伴される薬剤ｃ
は、図７に示すように、該濾布ｆ1 の濾過機能により排
ガスｇから分離され、若干の空隙ｈを介在させながら濾
布ｆ1 の表面に付着する。A large number of filter cloths f are provided in the bag filter device f.
1 is suspended and drug c is entrained in combustion gas d
As shown in FIG. 7, it is separated from the exhaust gas g by the filtering function filtrate cloth f 1, attached to the surface of the filter cloth f 1 while interposing a slight gap h.
【０００７】その結果、排ガスｇが上記濾布ｆ1 表面に
付着した薬剤ｃの層を通過する際に、含有するばいじん
ｂは濾過・除去されて、薬剤ｃと共に濾布ｆ1 の表面に
付着・堆積を続け、次第にばいじんｂ及び薬剤ｃが混合
状態となった粉じん層ｆ2 を形成する（図７参照）。As a result, when the exhaust gas g passes through the layer of the drug c adhering to the surface of the filter cloth f 1 , the soot and dust b contained therein is filtered and removed, and adheres to the surface of the filter cloth f 1 together with the drug c. -The deposition is continued to gradually form a dust layer f 2 in which the dust b and the drug c are in a mixed state (see FIG. 7).
【０００８】一方、排ガスｇ中に含有される酸性有害ガ
スａは、同伴される薬剤ｃとの間で中和反応を起しなが
ら上記粉じん層ｆ2 の表面に到達するが、粉じん層ｆ2
を通過する際に、残余の酸性有害ガスａが粉じん層ｆ2
内の未反応薬剤ｃとの間で更に中和反応を起し、９０％
程度の除去効率を得ている。On the other hand, the acidic harmful gas a contained in the exhaust gas g reaches the surface of the dust layer f 2 while undergoing a neutralization reaction with the entrained drug c, but the dust layer f 2
The residual acidic harmful gas a passes through the dust layer f 2
90% to cause a further neutralization reaction with the unreacted drug c in
The removal efficiency is about the same.
【０００９】従って、前記工程で薬剤ｃ及びばいじんｂ
が除去されているため、排ガスｇは清浄ガスｉとなって
清浄ガス通路ｆ3 に排出された後、誘引通風機ｊにより
吸引されて、清浄ガスダクトｋを経て図示しない煙突か
ら大気中に放出される。Therefore, in the above step, the drug c and the dust b
Since the exhaust gas g has been removed into the clean gas passage f 3 after being removed into the clean gas passage f 3 , the exhaust gas g is sucked by the draft fan j and discharged into the atmosphere from the chimney (not shown) through the clean gas duct k. It
【００１０】そして、上述した運転を継続すると、粉じ
ん層ｆ2 の通気抵抗が次第に増加して、排ガスｇが通過
し難くなるため、濾布ｆ1 の内外差圧検出装置ｆ4 の指
令により、払い落し装置ｆ5 からパルスジェット気流を
噴射して粉じん層ｆ2 を剥離させ、落下した粉じん即ち
捕集灰は、ホッパｆ6 を経て排出装置ｆ7 から外部に排
出するようになされている。When the above-mentioned operation is continued, the ventilation resistance of the dust layer f 2 gradually increases, and it becomes difficult for the exhaust gas g to pass through. Therefore, according to the command from the internal / external differential pressure detection device f 4 of the filter cloth f 1 , A pulse jet stream is jetted from the blow-off device f 5 to separate the dust layer f 2 , and the fallen dust, that is, the collected ash, is discharged from the discharge device f 7 to the outside via the hopper f 6 .
【００１１】[0011]
【発明が解決しようとする課題】然しながら、従来の方
式によれば、濾過の主力は薬剤ｃ及びばいじんｂにより
形成される粉じん層ｆ2 であり、バグフィルタ装置ｆの
濾過性能は、運転中に徐々に向上するものである。従っ
て、払い落し直後の単位集じん機構は、粉じん層ｆ2 が
未形成のために濾過能力がないだけでなく、通気抵抗が
低いために大量の排ガスｇが流入して多量の未処理ガス
を排出することになる。However, according to the conventional method, the main force of filtration is the dust layer f 2 formed by the drug c and the dust b, and the filtration performance of the bag filter device f is It will gradually improve. Therefore, the unit dust collection mechanism immediately after being blown off not only has no filtration capability because the dust layer f 2 is not formed, but also has a large amount of exhaust gas g that flows in due to its low ventilation resistance and a large amount of untreated gas. Will be discharged.
【００１２】このような状態のままでは、バグフィルタ
装置ｆ全体の濾過能力が低下して公害を発生するため、
これを防止する手段として当量比３〜５もの多量の薬剤
ｃを噴射し続けて粉じん層を早期に形成するのが一般的
であり、その結果、未反応薬剤ｃによる粉じん層ｆ2 の
増大を助長し、通気抵抗の上昇を早め、払い落し間隔が
短くなっていた。[0012] In such a state, the bag filter device f as a whole has a low filtering ability and causes pollution.
As a means for preventing this, it is general to continuously inject a large amount of the drug c with an equivalence ratio of 3 to 5 to form a dust layer at an early stage, and as a result, increase in the dust layer f 2 due to the unreacted drug c. The airflow resistance increased faster, and the intervals between the brushes were shortened.
【００１３】また、薬剤費が嵩むだけでなく、重金属や
ダイオキシン類の有害物質を含むために「特別管理廃棄
物」に指定されている捕集灰（排出灰）の量を増加させ
ることになり、後処理費用の増大を招いていた。[0013] Further, not only the drug cost is increased, but also the amount of collected ash (exhaust ash) designated as "specially controlled waste" is increased because it contains heavy metals and harmful substances such as dioxins. However, the post-processing cost was increased.
【００１４】さらに、特別の反応塔を前置して、中和反
応を助長する場合は、薬剤ｃの使用量は低減するもの
の、据付面積の拡大と併せて設備費用が高くなるという
問題があった。Furthermore, when a special reaction column is installed in front to promote the neutralization reaction, although the amount of the chemical c used is reduced, there is a problem that the installation area is increased and the equipment cost is increased. It was
【００１５】一方、粉じん層ｆ2 は、未反応及び反応済
の薬剤ｃ及びばいじんｂのみで形成されるものではな
く、排ガスｇ中に含まれる水分が同時に付着して成長す
るために、薬剤ｃ及びばいじんｂが吸湿して粘結力を生
じ、通気抵抗を増加させるとともに、濾布ｆ1 表面と結
合して払い落し作業を困難にするという問題があった。On the other hand, the dust layer f 2 is not formed only by the unreacted and reacted chemicals c and soot and dust b, but because the moisture contained in the exhaust gas g adheres and grows at the same time, the chemicals c In addition, there is a problem in that the dust b absorbs moisture to generate a caking force, which increases the ventilation resistance and also binds to the surface of the filter cloth f 1 to make it difficult to remove it.
【００１６】さらに、酸性有害ガスａの除去効率を向上
せしめるために、排ガスｇ中に水噴霧する等の手段で排
ガスｇの温度を低下させるという方法が一部で実施され
ているが、その結果、バグフィルタ装置ｆ及び前後系統
内での結露現象のほか、鋼材が低温腐食を起す危険性が
あった。Further, in order to improve the removal efficiency of the acidic harmful gas a, a method of lowering the temperature of the exhaust gas g by means such as spraying water into the exhaust gas g has been partially implemented. In addition to the dew condensation phenomenon in the bag filter device f and the front and rear systems, there was a risk of low temperature corrosion of the steel material.
【００１７】そこで、上述の諸問題を解決するために、
濾過作業を行う前に、濾布ｆ1 の表面にプレコート層ｐ
を形成しておくプレコート式バグフィルタ装置が用いら
れており、その制御方法として、本出願人による「バグ
フィルタ装置の制御方法（特開平５−１２３５１５）」
が提案されている。Therefore, in order to solve the above problems,
Before performing the filtering operation, the precoat layer p is formed on the surface of the filter cloth f 1.
A precoat type bag filter device for forming the above is used, and as a control method therefor, a “control method for a bag filter device” by the present applicant (Japanese Patent Laid-Open No. 123535/1993) is used.
Is proposed.
【００１８】以下、図８及び図９に、上記発明の概要を
示すが、前述したバグフィルタ装置と同一部材には同一
符号を付し説明を省略する。8 and 9 show the outline of the present invention, the same members as those of the above-described bag filter device are designated by the same reference numerals and the description thereof will be omitted.
【００１９】図８において、濾布ｆ1 内外の差圧をｆ4
より検出するとともに、バグフィルタ装置出口の気体濃
度を濃度計ｑにより検出し、これら検出結果に基いて、
制御装置ｒ1 ，ｒ2 の動作によりプレコート層ｐ（図９
参照）の層厚を調整するとともに、払い落し時期を調整
するようになされている。In FIG. 8, the pressure difference between the inside and outside of the filter cloth f 1 is represented by f 4
In addition to the above detection, the gas concentration at the bag filter device outlet is detected by the densitometer q, and based on these detection results,
The precoat layer p (see FIG. 9) is generated by the operation of the control devices r 1 and r 2 .
(See), the layer thickness is adjusted, and the timing of the removal is adjusted.
【００２０】然しながら、本方式においても、プレコー
ト層ｐを形成する粉体である薬剤ｃと気体である酸性有
害ガスａとの接触は固−気接触であり、反応効率が十分
でないばかりでなく、プレコート層ｐ内に介在する空隙
ｈによる排ガスｇの短絡現象により（図９に矢印で示す
経路）、十分な除去効率を発揮できない。However, also in this system, the contact between the drug c, which is a powder forming the precoat layer p, and the acidic harmful gas a, which is a gas, is solid-gas contact, and not only the reaction efficiency is not sufficient, Due to the short circuit phenomenon of the exhaust gas g due to the void h interposed in the precoat layer p (path shown by the arrow in FIG. 9), sufficient removal efficiency cannot be exhibited.
【００２１】[0021]
【課題を解決するための手段】本発明のバグフィルタに
よる排ガス処理装置は、含じん気体導入ダクトが接続さ
れるとともに、下端がダスト排出装置に接続されたホッ
パ室と、該ホッパ室の上部に連接され複数の濾布が懸架
された濾過室と、該濾過室の上部に設けられた清浄ガス
室とを備えたバグフィルタ装置において、前記濾布面に
形成されたプレコート層または粉じん層を加湿する加湿
手段が設けられ、該加湿手段による加湿液の噴霧量が調
節可能に構成されたものである。An exhaust gas treatment apparatus using a bag filter according to the present invention has a hopper chamber connected to a dust-containing gas introduction duct and having a lower end connected to a dust discharge device, and an upper portion of the hopper chamber. In a bag filter device provided with a filtration chamber in which a plurality of filter cloths are connected and suspended, and a clean gas chamber provided above the filtration chamber, a precoat layer or a dust layer formed on the filter cloth surface is humidified. The humidifying means is provided, and the amount of the humidifying liquid sprayed by the humidifying means can be adjusted.
【００２２】[0022]
【作用】バグフィルタ装置内に懸架された複数の濾布表
面にプレコート層を形成した直後に、ホッパ下部に設け
られた水噴霧装置から排ガス中に、供給された薬剤量に
応じて調整された量の加湿水を短時間噴霧してプレコー
ト層を加湿した後、通常の濾過作業に入ることにより、
酸性有害ガス及びばいじんの除去効率の向上を図る。[Action] Immediately after forming the precoat layer on the surfaces of the plurality of filter cloths suspended in the bag filter device, it was adjusted according to the amount of the drug supplied into the exhaust gas from the water spray device provided in the lower part of the hopper. After spraying a certain amount of humidifying water for a short time to humidify the precoat layer, by entering a normal filtration operation,
Improve the efficiency of removing acidic harmful gases and dust.
【００２３】[0023]
【実施例】以下、本発明の一実施例を図面を参照して説
明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.
【００２４】図１及び図２は本発明に係るプレコート式
バグフィルタ装置の概略構成を示し、図３はプレコート
層形成中及びプレコート層加湿中の該バグフィルタ装置
下部の状況を示している。また、図４及び図５は加湿中
及び濾過作業中のプレコート層部分の拡大図である。FIGS. 1 and 2 show a schematic structure of a precoat type bag filter device according to the present invention, and FIG. 3 shows the condition of the lower part of the bag filter device during formation of the precoat layer and humidification of the precoat layer. 4 and 5 are enlarged views of the precoat layer portion during humidification and filtration.
【００２５】図１及び図２において、１は多室構造のバ
グフィルタ装置の１室であり、１１は複数の濾布１２を
装備する濾過室であり、濾過室１１の下方にはホッパ室
１３が接続されている。ホッパ室１３の下端は煙道２と
の接続部１４になされており、該接続部１４の下方にダ
スト排出装置１５が連接されている。In FIGS. 1 and 2, 1 is one chamber of a bag filter device having a multi-chamber structure, 11 is a filtration chamber equipped with a plurality of filter cloths 12, and below the filtration chamber 11 is a hopper chamber 13. Are connected. A lower end of the hopper chamber 13 is formed as a connecting portion 14 with the flue 2, and a dust discharging device 15 is connected below the connecting portion 14.
【００２６】煙道２には、図示しないごみ焼却炉で発生
し、図示しないガス冷却手段によって冷却された低温の
燃焼ガス３が流入する。A low temperature combustion gas 3 generated in a refuse incinerator (not shown) and cooled by a gas cooling means (not shown) flows into the flue 2.
【００２７】図２に示す符号４は薬剤供給装置であり、
薬剤量調節装置４１を装備した薬剤貯留槽４２と、燃焼
ガス３中の酸性有害ガス３１を中和するための薬剤５を
ホッパ室１３内に導入する薬剤送入管４３及び図示しな
い薬剤輸送手段から構成されている。Reference numeral 4 shown in FIG. 2 is a medicine supply device,
A drug reservoir 42 equipped with a drug amount adjusting device 41, a drug feed pipe 43 for introducing the drug 5 for neutralizing the acidic harmful gas 31 in the combustion gas 3 into the hopper chamber 13, and a drug transport means (not shown). It consists of
【００２８】前記ホッパ室１３の周面における前記薬剤
送入管４３の取付位置を避けた他の位置には、複数のノ
ズル６３が形成されている。これら複数のノズル６３は
ヘッダ６２によって合流されており、噴霧水開閉弁６１
を経て水を供給する図示しない供給源に接続されてい
る。よって、上述した噴霧水開閉弁６１、ヘッダ６２、
複数のノズル６３等により加湿手段を構成しており、ノ
ズル６３から噴霧水７をホッパ室１３内に噴霧すること
ができる。A plurality of nozzles 63 are formed on the peripheral surface of the hopper chamber 13 at other positions other than the mounting position of the medicine feeding pipe 43. The plurality of nozzles 63 are merged by the header 62, and the spray water opening / closing valve 61
It is connected to a supply source (not shown) that supplies water via the. Therefore, the spray water opening / closing valve 61, the header 62,
The plurality of nozzles 63 and the like constitute a humidifying unit, and the spray water 7 can be sprayed into the hopper chamber 13 from the nozzles 63.
【００２９】前記濾過室１１の上方には、内部にダスト
払い落し装置１６を備えた清浄ガス室１７が形成されて
おり、清浄ガスダンパ８１を設けた清浄ガスダクト８を
介して図示しない誘引通風機及び煙突に連通されてい
る。A clean gas chamber 17 having a dust blow-off device 16 therein is formed above the filtration chamber 11, and a suction fan (not shown) and a clean air duct (not shown) are provided via a clean gas duct 8 provided with a clean gas damper 81. It communicates with the chimney.
【００３０】また、バグフィルタ装置１には、濾布１２
の内側と外側との差圧を検出する差圧検出器１８が設け
られるとともに、清浄ガスダクト８には、該バグフィル
タ装置１の出口側の酸性有害ガス濃度を検出する濃度検
出器８２が設けられており、これら差圧検出器１８及び
濃度検出器８２で検出された検出値は図２に示す制御装
置９に入力され、これら検出値に基いて後述の各装置を
制御するようになされている。The bag filter device 1 includes a filter cloth 12
A differential pressure detector 18 for detecting the differential pressure between the inside and the outside of the bag filter device 1 is provided, and the clean gas duct 8 is provided with a concentration detector 82 for detecting the concentration of acidic harmful gas at the outlet side of the bag filter device 1. The detection values detected by the differential pressure detector 18 and the concentration detector 82 are input to the control device 9 shown in FIG. 2, and each device described later is controlled based on these detection values. .
【００３１】次に、上述のように構成された本発明に係
るプレコート式バグフィルタ装置における、プレコート
層形成と加湿作業及び濾過作業並びに払い落し作業の各
動作について説明する。Next, the operations of precoat layer forming, humidifying work, filtering work and removing work in the precoat type bag filter device according to the present invention constructed as described above will be explained.
【００３２】図１乃至図３において、清浄ガスダンパ８
１を開いた状態では、図示しない焼却炉で発生した酸性
有害ガス３１やばいじん３２を含有する高温の燃焼ガス
は、図示しないガス冷却手段で冷却されて低湿の燃焼ガ
ス３となり、煙道２内を通ってバグフィルタ装置１に入
り、接続部１４を経由してホッパ室１３内を上昇して濾
過室１１に到達する。1 to 3, the clean gas damper 8 is shown.
In the state where 1 is opened, the high-temperature combustion gas containing the acidic harmful gas 31 and the dust 32 generated in the incinerator (not shown) is cooled by the gas cooling means (not shown) to become the low-humidity combustion gas 3 in the flue 2. After passing through the bag filter device 1, the bag filter device 1 rises in the hopper chamber 13 through the connecting portion 14 and reaches the filtration chamber 11.
【００３３】ここで、薬剤貯留槽４２から薬剤量調節装
置４１の回転数等により計量された規定量の薬剤５を、
図示しない空送方式などの薬剤輸送手段により、薬剤送
入管４３を経由してホッパ室１３内に送入すれば、燃焼
ガス３の上昇力により、薬剤５は高速で吹上げられる。Here, a prescribed amount of the medicine 5 measured from the medicine storage tank 42 by the number of rotations of the medicine amount adjusting device 41,
If the drug is fed into the hopper chamber 13 via the drug feed pipe 43 by a drug delivery means such as an air delivery system (not shown), the drug 5 is blown up at high speed by the rising force of the combustion gas 3.
【００３４】この吹上げられた薬剤５は、燃焼ガス３と
混合した状態で複数の濾布１２の表面に到達し、濾布１
２の濾過作用により、燃焼ガス３から分離されて濾布１
２の表面に付着して、プレコート層５１を短時間で形成
する。The sprayed chemicals 5 reach the surfaces of a plurality of filter cloths 12 in a state of being mixed with the combustion gas 3, and the filter cloths 1
The filter cloth 1 is separated from the combustion gas 3 by the filtering action of 2.
Then, the precoat layer 51 is formed on the surface of No. 2 in a short time.
【００３５】この後、噴霧水開閉弁６１を短時間開放す
ることで、供給源から供給される水がヘッダ６２を経由
して複数のノズル６３から噴霧水７としてホッパ室１３
内に噴霧される。これにより噴霧水７が前述の薬剤５と
同じく、燃焼ガス３に同伴されて上昇し、複数の濾布１
２の表面に形成されたプレコート層５１に吸収されて表
面を湿潤状態にするとともに、次第に内部に浸透して、
プレコート層５１内に形成された空隙５２（図４参照）
内を充満させ、燃焼ガス３の短絡経路を消滅させる。After that, the spray water opening / closing valve 61 is opened for a short time so that the water supplied from the supply source passes through the header 62 and is sprayed from the plurality of nozzles 63 as the spray water 7 in the hopper chamber 13.
Is sprayed in. As a result, the sprayed water 7 is entrained in the combustion gas 3 and rises in the same manner as the above-mentioned chemicals 5, and the plurality of filter cloths 1
2 is absorbed by the precoat layer 51 formed on the surface of No. 2 to make the surface wet, and gradually penetrates into the inside,
Voids 52 formed in the precoat layer 51 (see FIG. 4)
The inside is filled and the short circuit path of the combustion gas 3 is extinguished.
【００３６】ここで、ノズル６３は、噴霧水７がプレコ
ート層５１に到達する迄に蒸発しない程度の大きさの粒
径で噴霧可能な形式を採用し、制御装置９により、前述
の送入薬剤量と上述の噴霧量との比率を予め調節すれ
ば、プレコート層５１を、水分が濾布１２の表面迄は到
達しない程度の適当な加湿状態にする事ができる。Here, the nozzle 63 is of a type capable of spraying with a particle size of a size such that the spray water 7 does not evaporate by the time it reaches the precoat layer 51. If the ratio between the amount and the above-mentioned spray amount is adjusted in advance, the precoat layer 51 can be in an appropriate humidified state in which moisture does not reach the surface of the filter cloth 12.
【００３７】以上の加湿されたプレコート層５１の形成
が終れば、通常の濾過作業に移行する。When the formation of the moistened precoat layer 51 is completed, a normal filtration operation is started.
【００３８】上述の如く、吸湿により短絡経路をつくる
要因である空隙５２がなくなったプレコート層５１を燃
焼ガス３が通過する際は、半湿式有害ガス除去装置と近
似の状態であるため、燃焼ガス３に含有される酸性有害
ガス３１は、該プレコート層５１表層の水分に補促され
て液状化し、薬剤５との間で液−固接触の形で効率良く
中和反応を起して無害化される。As described above, when the combustion gas 3 passes through the precoat layer 51 from which the void 52, which is a factor that creates a short circuit path due to moisture absorption, disappears, the combustion gas 3 is in a state similar to that of the semi-wet harmful gas removing device. The acidic harmful gas 31 contained in No. 3 is liquefied by being promoted by the water content of the surface layer of the precoat layer 51, and effectively neutralizes in the form of liquid-solid contact with the chemical 5 to render it harmless. To be done.
【００３９】さらに、同じく燃焼ガス３に含有されるば
いじん３２は、吸湿したプレコート層５１に効率良く濾
過されて、プレコート層５１の表面に付着・堆積を続け
て、次第に粉じん層３２１（図５参照）を形成して行
く。Further, the soot and dust 32 also contained in the combustion gas 3 is efficiently filtered by the moisture-absorbed precoat layer 51, continues to adhere and deposit on the surface of the precoat layer 51, and gradually becomes the dust layer 321 (see FIG. 5). ) Form.
【００４０】かくして、酸性有害ガス３１及びばいじん
３２が完全に除去されるために、燃焼ガス３は清浄ガス
３３となって清浄ガス室１７に排出され、図示しない誘
引通風機に吸引されて、清浄ガスダクト８及び清浄ガス
ダンパ８１を経由して図示しない煙突から大気中に放出
される。In this way, since the acidic harmful gas 31 and the dust 32 are completely removed, the combustion gas 3 becomes the clean gas 33 and is discharged into the clean gas chamber 17 and sucked by the unillustrated draft fan to clean the gas. The gas is discharged into the atmosphere from a chimney (not shown) via the gas duct 8 and the clean gas damper 81.
【００４１】この状態で運転を継続すれば、プレコート
層５１中の水分は次第に蒸発して通気抵抗が低下する
が、粉じん層３２１の伸張による抵抗増加と相殺され
て、最終的には通気抵抗が増大して燃焼ガス３の通過を
阻害する。If the operation is continued in this state, the water content in the precoat layer 51 gradually evaporates and the ventilation resistance decreases, but this is offset by the resistance increase due to the expansion of the dust layer 321, and finally the ventilation resistance is reduced. It increases and obstructs the passage of the combustion gas 3.
【００４２】この状態を差圧検出器１８により検出し、
差圧が設定値以上になれば、制御装置９により清浄ガス
ダンパ８１を閉鎖した後、ダスト払い落し装置１６に指
令して、濾布１２内にパルスジェットを噴射して、プレ
コート層５１及び粉じん層３２１を濾布１２の表面から
剥離させ、落下物は、ホッパ室１３を経て排出装置１５
から外部に排出する。This state is detected by the differential pressure detector 18,
When the differential pressure becomes equal to or higher than the set value, the control device 9 closes the clean gas damper 81, and then the dust removing device 16 is instructed to inject a pulse jet into the filter cloth 12 to pre-coat the layer 51 and the dust layer. 321 is peeled from the surface of the filter cloth 12, and the fallen objects pass through the hopper chamber 13 and the discharging device 15
To the outside.
【００４３】一方、上述のプレコート層５１中の水分の
蒸発に伴い、酸性有害ガス３１は、薬剤５との間で液−
固接触から気−固接触の方に移行してゆくため、反応効
率は低下し始める。続いて、プレコート層５１中の未反
応薬剤が減少すると、清浄ガス３３中の酸性有害ガス濃
度が上昇を始める。On the other hand, as the water content in the precoat layer 51 evaporates, the acidic harmful gas 31 forms a liquid with the chemical 5.
The reaction efficiency starts to decrease because the solid contact is transferred to the gas-solid contact. Then, when the amount of unreacted chemicals in the precoat layer 51 decreases, the concentration of acidic harmful gas in the clean gas 33 starts to increase.
【００４４】ここで、酸性有害ガス濃度が設定値に到達
しているのに、前述の差圧に余裕がある場合は、制御装
置９により、薬剤量調節装置４１を短時間運転して、粉
じん層３２１の表面に薬剤５の追加付着層を形成せしめ
る事により濾過作業を継続する。Here, when the acidic harmful gas concentration has reached the set value but there is a margin in the above-mentioned differential pressure, the control device 9 causes the drug amount adjusting device 41 to operate for a short time to cause dust. The filtration operation is continued by forming an additional adhesion layer of the drug 5 on the surface of the layer 321.
【００４５】その後、ガス濃度及び差圧ともに設定値に
到達すれば、前述の払い落し作業に移る。After that, when both the gas concentration and the differential pressure reach the set values, the above-mentioned blow-off work is started.
【００４６】このように、濾過作業を行う前の段階で予
めプレコート層を形成するだけでなく、清浄ガス濃度が
規定値に達していても、差圧が規定値に達していない場
合は更に薬剤を追加付着せしめる方式であるために、付
着薬剤を完全消費し払い落し間隔を延伸するのみでな
く、従来方式における払い落し後の濾過能力不足を惹起
することもない。As described above, not only the precoat layer is formed in advance at the stage before the filtration operation, but even if the clean gas concentration reaches the specified value, if the differential pressure does not reach the specified value, further chemicals are added. Since it is a system in which the adhesive agent is additionally attached, not only is the adhesive agent completely consumed and the removal interval is extended, but the lack of filtration capacity after removal in the conventional method is not caused.
【００４７】上記払い落し操作が完了すれば、清浄ガス
ダンパ８１を開放することで、最初のプレコート層形成
作業に戻る。Upon completion of the above-mentioned removing operation, the clean gas damper 81 is opened to return to the first precoat layer forming operation.
【００４８】以上は、濾過作業を行う前に、濾布の表面
にプレコート層を形成するプレコート式で説明したが、
本例の制御方式に限らず、薬剤が排ガスに同伴されて飛
来し、濾布上に堆積して粉じん層を形成する従来方式の
場合は、濾布内外の差圧が一定値を超えてから加湿を開
始し、濃度検出器の検出値が規定値を下回ったら加湿を
停止する等の制御方式を採用してもよい。In the above, the pre-coating method in which the pre-coat layer is formed on the surface of the filter cloth before performing the filtering operation has been described.
Not only in the control method of this example, but in the case of the conventional method in which the chemical agent flies along with the exhaust gas and is deposited on the filter cloth to form a dust layer, after the differential pressure inside and outside the filter cloth exceeds a certain value. A control method may be adopted in which the humidification is started, and the humidification is stopped when the detection value of the concentration detector falls below a specified value.
【００４９】なお、本例では、加湿手段において水を噴
霧するように説明したが、苛性ソーダ等のアルカリ液体
でもよく、燃焼ガス３の開閉用に清浄ガスダンパ８１を
用いたが、煙道２に燃焼ガスダンパを設けてもよい。In the present example, the description was made such that water was sprayed in the humidifying means, but an alkaline liquid such as caustic soda may be used, and the clean gas damper 81 was used to open and close the combustion gas 3, but the flue 2 burns. A gas damper may be provided.
【００５０】[0050]
【発明の効果】本発明によれば、プレコート層を予め加
湿手段によって加湿することにより、酸性有害ガス及び
ばいじんの除去効率が向上するために、薬剤の大量投入
に伴う薬剤費の上昇や捕集灰処理費用の増加を防げるだ
けでなく、反応塔を前置するなどの過剰設備費が不要と
なり、効率向上を目的とした排ガス低温化による結露や
低温腐食の悪影響を防止することができる。According to the present invention, the precoat layer is preliminarily humidified by a humidifying means, so that the efficiency of removing acidic harmful gas and dust is improved. Not only can the ash treatment cost be prevented from increasing, but excess equipment costs such as the pre-positioning of a reaction tower are not required, and the adverse effects of dew condensation and low temperature corrosion due to the temperature reduction of exhaust gas can be prevented for the purpose of improving efficiency.
【００５１】また、薬剤供給量に応じて加湿液の噴霧量
を調節できるために、プレコート層への加湿が最適な状
態で行われ、濾布への水分付着による払い落し作業の困
難化を回避することができる。Further, since the amount of the humidifying liquid sprayed can be adjusted according to the amount of supplied chemicals, the precoat layer can be humidified in an optimum state, and it is possible to avoid the difficulty of the removal work due to the adhesion of water to the filter cloth. can do.
【図１】本発明に係るプレコート式バグフィルタ装置の
概略構成を示す断面図である。FIG. 1 is a cross-sectional view showing a schematic configuration of a precoat type bag filter device according to the present invention.
【図２】本発明に係るプレコート式バグフィルタ装置の
全体の概略構成を示す概略図である。FIG. 2 is a schematic view showing the overall schematic configuration of a precoat type bag filter device according to the present invention.
【図３】プレコート層形成中及びプレコート層加湿中の
該バグフィルタ装置下部の状況を示す断面図である。FIG. 3 is a cross-sectional view showing a state of a lower portion of the bag filter device during formation of the precoat layer and humidification of the precoat layer.
【図４】加湿中のプレコート層部分の状態を示す拡大の
断面図である。FIG. 4 is an enlarged sectional view showing a state of a precoat layer portion during humidification.
【図５】濾過作業中のプレコート層部分の状態を示す拡
大の断面図である。FIG. 5 is an enlarged cross-sectional view showing a state of a precoat layer portion during a filtering operation.
【図６】従来のバグフィルタによる排ガス処理装置の概
略構成を示す概略図である。FIG. 6 is a schematic diagram showing a schematic configuration of an exhaust gas treatment apparatus using a conventional bag filter.
【図７】従来のバグフィルタ装置による濾過作業中の濾
布周辺部を示す拡大の断面図である。FIG. 7 is an enlarged cross-sectional view showing a filter cloth peripheral portion during a filtering operation by a conventional bag filter device.
【図８】従来のプレコート式バグフィルタ装置の概略構
成を示す概略図である。FIG. 8 is a schematic diagram showing a schematic configuration of a conventional precoat type bag filter device.
【図９】従来のプレコート式バグフィルタ装置による濾
過作業中の濾布周辺部を示す拡大の断面図である。FIG. 9 is an enlarged cross-sectional view showing a filter cloth peripheral portion during a filtering operation by a conventional precoat type bag filter device.
１ バグフィルタ装置 １１ 濾過室 １２ 濾布 １３ ホッパ室 １５ ダスト排出装置 １７ 清浄ガス室 ２ 煙道（含じん気体導入ダクト） ５１ プレコート層 ６ 水噴霧装置（加湿手段） 1 Bag Filter Device 11 Filtration Chamber 12 Filter Cloth 13 Hopper Room 15 Dust Discharge Device 17 Clean Gas Chamber 2 Flue (Dust Introducing Duct Introduction Duct) 51 Precoat Layer 6 Water Spraying Device (Humidifying Means)
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｂ０１Ｄ 53/70 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Office reference number FI technical display location B01D 53/70
Claims (1)
もに、下端がダスト排出装置に接続されたホッパ室と、
該ホッパ室の上部に連接され複数の濾布が懸架された濾
過室と、該濾過室の上部に設けられた清浄ガス室とを備
えたバグフィルタ装置において、 前記濾布面に形成されたプレコート層または粉じん層を
加湿する加湿手段が設けられ、該加湿手段による加湿液
の噴霧量が調節可能に構成されたことを特徴とするバグ
フィルタによる排ガス処理装置。1. A hopper chamber, to which a dust-containing gas introduction duct is connected and whose lower end is connected to a dust discharging device,
A bag filter device comprising: a filter chamber connected to the upper part of the hopper chamber and suspending a plurality of filter cloths; and a clean gas chamber provided on the upper part of the filter chamber, wherein a precoat formed on the filter cloth surface. An exhaust gas treatment apparatus using a bag filter, characterized in that a humidifying means for humidifying the layer or the dust layer is provided, and the amount of the humidifying liquid sprayed by the humidifying means can be adjusted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6042212A JPH07251021A (en) | 1994-03-14 | 1994-03-14 | Exhaust gas treating apparatus with bag filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6042212A JPH07251021A (en) | 1994-03-14 | 1994-03-14 | Exhaust gas treating apparatus with bag filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07251021A true JPH07251021A (en) | 1995-10-03 |
Family
ID=12629730
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6042212A Pending JPH07251021A (en) | 1994-03-14 | 1994-03-14 | Exhaust gas treating apparatus with bag filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07251021A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009026984A1 (en) * | 2007-08-24 | 2009-03-05 | Dürr Systems GmbH | Filter device and method for removing wet-paint overspray |
| US8431180B2 (en) | 2008-12-19 | 2013-04-30 | Dürr Systems GmbH | Paint shop and method of operating a paint shop |
| RU2507010C2 (en) * | 2008-09-04 | 2014-02-20 | Айзенманн Аг | Device for separation of excessively sprayed lacquer |
| CN112857071A (en) * | 2021-02-23 | 2021-05-28 | 常州机电职业技术学院 | Flue gas treatment device for metal smelting and flue gas treatment method thereof |
-
1994
- 1994-03-14 JP JP6042212A patent/JPH07251021A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009026984A1 (en) * | 2007-08-24 | 2009-03-05 | Dürr Systems GmbH | Filter device and method for removing wet-paint overspray |
| AU2008291387B2 (en) * | 2007-08-24 | 2013-03-14 | Durr Systems Ag | Filter device and method for removing wet-paint overspray |
| RU2507010C2 (en) * | 2008-09-04 | 2014-02-20 | Айзенманн Аг | Device for separation of excessively sprayed lacquer |
| US8431180B2 (en) | 2008-12-19 | 2013-04-30 | Dürr Systems GmbH | Paint shop and method of operating a paint shop |
| US8658240B2 (en) | 2008-12-19 | 2014-02-25 | Durr Systems Gmbh | Paint shop and method of operating a paint shop |
| CN112857071A (en) * | 2021-02-23 | 2021-05-28 | 常州机电职业技术学院 | Flue gas treatment device for metal smelting and flue gas treatment method thereof |
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