JPH08155257A - Formation of flue-gas purifying layer - Google Patents

Formation of flue-gas purifying layer

Info

Publication number
JPH08155257A
JPH08155257A JP6306375A JP30637594A JPH08155257A JP H08155257 A JPH08155257 A JP H08155257A JP 6306375 A JP6306375 A JP 6306375A JP 30637594 A JP30637594 A JP 30637594A JP H08155257 A JPH08155257 A JP H08155257A
Authority
JP
Japan
Prior art keywords
filter
flue gas
substance
filter cloth
filter aid
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
Application number
JP6306375A
Other languages
Japanese (ja)
Inventor
Meiji Ito
明治 伊東
Wakako Shimodaira
和佳子 下平
Naoki Fujiwara
直機 藤原
Manabu Yamamoto
学 山本
Kazunori Fujita
一紀 藤田
Toru Senju
透 千手
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Power Ltd
Original Assignee
Babcock Hitachi KK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Babcock Hitachi KK filed Critical Babcock Hitachi KK
Priority to JP6306375A priority Critical patent/JPH08155257A/en
Publication of JPH08155257A publication Critical patent/JPH08155257A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To form a flue-gas purifying layer on a filtering cloth of a pulse jet-type bag filter, and improve the protective effect of the filtering cloth and the harmful substance-removing efficiency in combustion flue gas. CONSTITUTION: Flue gas produced in a refuse incinerator 51 is cooled in a cooling tower 52 to a suitable temperature for purification treatment and slaked lime to eliminate acidic gas and a necessary filter aid are added thereto through a continuous supplying pipe 93. Compressed air is jetted in pulses to respective filtering clothes set in respective sections 73, 74, 75 through any one of compressed air jetting outlets 80, 81, 82 in a bag filter 53 and substances adhering to the filtering clothes are shaken down by the impact force of the compressed air. Either the filter aid or a mixture of the filter aid with slaked lime is jetted to the filter clothes from any one of filter aid jetting outlet 77, 78, 79 immediately after the reproducing treatment carried out in this way to coat the surfaces of the filtering clothes with these substances. On the resultant surfaces, a mixture layer of a slaked lime and a necessary filtering agent is precipitated to give a flue gas purifying layer.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、排煙浄化層の形成方法
に係り、特に、濾布付着層の払い落し装置として所謂パ
ルスジェット型再生装置が備えられたバグフィルタ濾布
に対する排煙浄化層の形成方法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a flue gas purification layer, and more particularly to flue gas purification for a bag filter filter cloth provided with a so-called pulse jet type regenerator as a device for removing the filter cloth adhering layer. A method for forming a layer.

【0002】[0002]

【従来の技術】都市ごみ焼却炉から発生する排煙中に
は、大気を汚染する各種の有害物質が含まれているの
で、そのままでは大気中に放出できない。このため、従
来より、焼却炉の燃焼排煙をバグフィルタを通して濾過
し、有害物質を除去した後に大気中に放出するという方
法が一般に採られている。
2. Description of the Related Art The flue gas emitted from an incinerator for municipal solid waste contains various harmful substances that pollute the atmosphere and cannot be released into the atmosphere as it is. For this reason, conventionally, a method has been generally adopted in which combustion exhaust gas from an incinerator is filtered through a bag filter to remove harmful substances and then released into the atmosphere.

【0003】有害物質のうち、微粒子の状態で存在する
煤煙やダイオキシンそれに重金属等は、燃焼排煙をバグ
フィルタの濾布で濾過することによって直接除去でき
る。また、濾布の表面に活性炭等の吸着剤粉末を含む排
煙浄化層を形成すれば、気体で存在するダイオキシンや
重金属等も吸着して除去できる。これに対して、気体の
状態で多量に存在する塩化水素や硫黄酸化物等の酸性ガ
スは、そのままでは濾布を通過してしまうために、バグ
フィルタにて除去できない。そこで、酸性ガスについて
は、濾布の表面に消石灰あるいは石灰石等のアルカリ性
物質を含む排煙浄化層を形成し、排煙がこれを通過する
過程で、浄化層内のアルカリ性物質に排煙中の酸性ガス
を吸収させて除去するという方法が一般に採られてい
る。尚、前記の排煙浄化層には、濾布の目詰まりを防止
したり、あるいは濾布からの排煙浄化層並びに当該層上
に堆積した燃焼排煙中の有害物質層の剥離を容易にする
など、排煙の浄化に直接作用するものではないが、排煙
浄化層の物性を改善するための濾過助剤を添加すること
も従来より知られている。
Among the harmful substances, soot smoke, dioxins, heavy metals and the like existing in the form of fine particles can be directly removed by filtering the combustion exhaust gas with a filter cloth of a bag filter. Further, if a flue gas purification layer containing adsorbent powder such as activated carbon is formed on the surface of the filter cloth, it is possible to adsorb and remove dioxins, heavy metals and the like that are present in a gas state. On the other hand, a large amount of acidic gases such as hydrogen chloride and sulfur oxides in a gas state cannot be removed by the bag filter because they pass through the filter cloth as they are. Therefore, for acidic gases, a flue gas purification layer containing alkaline substances such as slaked lime or limestone is formed on the surface of the filter cloth, and in the process of passing the flue gas, the alkaline substances in the purification layer are discharged into the flue gas. A method of absorbing and removing acid gas is generally adopted. The flue gas purification layer can prevent clogging of the filter cloth, or can easily separate the flue gas purification layer from the filter cloth and the harmful substance layer in the combustion flue gas deposited on the layer. Although it does not directly affect the purification of flue gas, it has been conventionally known to add a filter aid for improving the physical properties of the flue gas purification layer.

【0004】ところで、排煙浄化層の形成方法として
は、大別して2つの方法がある。その1つは、バグフィ
ルタの上流で排煙中に浄化用の物質(濾過助剤を含む。
本明細書においては、これを「排煙浄化物質」とい
う。)を連続的に供給し、煤塵と排煙浄化物質との混合
物を濾布の表面に被覆させることによって、排煙浄化層
を形成すると同時に排煙を処理する方法であり、実際に
広く使用されている。他の1つは、払い落し装置によっ
て濾布の表面に付着した付着層を剥離し、濾布を再生す
るごとに、濾布の表面に濾過助剤、吸着剤、アルカリ性
物質等のいずれかを主成分とする排煙浄化物質を被着し
て排煙浄化層を形成し、しかる後に、この排煙浄化層に
排煙を通過させて燃焼排煙を浄化処理する方法である。
By the way, there are roughly two methods for forming the flue gas purification layer. One is to include a cleaning substance (filter aid) in the flue gas upstream of the bag filter.
In the present specification, this is referred to as “flue gas purifying substance”. ) Is continuously supplied, and a mixture of soot and flue gas purification material is coated on the surface of the filter cloth to form a flue gas purification layer and at the same time to treat flue gas, which is widely used in practice. ing. The other one is to peel off the adhering layer adhering to the surface of the filter cloth by a scraping device, and every time the filter cloth is regenerated, a filter aid, an adsorbent, an alkaline substance or the like is attached to the surface of the filter cloth. This is a method of forming a flue gas purification layer by depositing a flue gas purification substance as a main component, and then passing the flue gas through the flue gas purification layer to purify the combustion flue gas.

【0005】後者の一例として、特公昭62−2908
8号公報に示される方法では、濾布の表面を1〜3mm
の厚さの濾過助剤で被覆した後、この濾過助剤層上にア
ルカリ性物質を被覆して排煙浄化層を形成し、これに排
煙を通過させて浄化処理する方法が記載されている。濾
布の表面に濾過助剤を遍在させると、濾布に直接煤塵や
アルカリ性物質それに反応生成物が接触しないので、濾
布の腐食が防止されると共に、濾布の表面にそれらの物
質が固着しないので、濾布の目詰まりも防止される。さ
らに、排煙浄化層内にダイオキシンや重金属の吸着剤を
遍在させれば、排煙浄化層の排煙導入側で固体状のダイ
オキシン等が除去され、排煙浄化層内には微量の気体状
のダイオキシン等を含む排煙のみが通過するため、吸着
剤の無駄を防止できる。また、排煙を処理しながらアル
カリ性物質を濾布に被覆していくのではなく、濾布の表
面に形成される排煙浄化層中に、予め未使用のアルカリ
性物質を遍在させれば、排煙浄化層の排煙導入側から順
次酸性ガスの吸収反応が進行するので、排煙浄化層の厚
さを適当な値にすれば、濾布に反応生成物が直接接触す
るのを防止あるいは減少することができ、濾布の傷みを
少なくできる。
As an example of the latter, Japanese Examined Patent Publication No. 62-2908.
In the method disclosed in Japanese Patent Publication No. 8-3, the surface of the filter cloth is 1 to 3 mm.
After coating with a filter aid having a thickness of, an alkaline substance is coated on the filter aid layer to form a flue gas purification layer, and flue gas is allowed to pass through the layer for purification treatment. . When the filter aid is ubiquitous on the surface of the filter cloth, the filter cloth does not come into direct contact with soot dust, alkaline substances and reaction products, so that the filter cloth is prevented from being corroded and at the same time those substances are not present on the surface of the filter cloth. Since it does not stick, clogging of the filter cloth is also prevented. Furthermore, if dioxin or a heavy metal adsorbent is ubiquitous in the flue gas purification layer, solid dioxin, etc. are removed at the flue gas introduction side of the flue gas purification layer, and a trace amount of gas is present in the flue gas purification layer. Since only the flue gas containing dioxin and the like passes, the waste of the adsorbent can be prevented. Also, instead of covering the filter cloth with an alkaline substance while treating the flue gas, if an unused alkaline substance is ubiquitous in the flue gas purification layer formed on the surface of the filter cloth, Since the absorption reaction of acidic gas progresses sequentially from the flue gas introduction side of the flue gas purification layer, setting the thickness of the flue gas purification layer to an appropriate value prevents the reaction products from directly contacting the filter cloth. It can be reduced, and the damage of the filter cloth can be reduced.

【0006】他の例として、特開昭62−74439号
公報、特開昭62−74440号公報及び特開平1−2
93123号公報には、珪藻土、パーライト等の濾過助
剤を濾布表面に被覆した後、さらに同種の濾過助剤をバ
グフィルタの上流で排煙中に連続的に供給して、前記の
濾過助剤層上に、煤塵と濾過助剤との混合層を被覆し、
排煙を浄化処理する方法が示されている。この方法によ
ると、煤塵と混在した濾過助剤によって通気性を改善で
きる共に、濾布表面に遍在する濾過助剤によって濾布を
保護できる。
As other examples, JP-A-62-74439, JP-A-62-74440 and JP-A-1-2 are used.
No. 93123 discloses that after the filter cloth surface is coated with a filter aid such as diatomaceous earth and perlite, the same filter aid is continuously supplied upstream of the bag filter into the flue gas to obtain the filter aid. On the agent layer, a mixed layer of soot dust and filter aid is coated,
A method of purifying flue gas is shown. According to this method, air permeability can be improved by the filter aid mixed with soot and dust, and the filter cloth can be protected by the filter aid ubiquitous on the surface of the filter cloth.

【0007】[0007]

【発明が解決しようとする課題】濾布の表面に所要の物
質を被覆して排煙浄化層を形成する方法は、逆洗方式の
バグフィルタには適用することができる。すなわち、本
方式のバグフィルタは、バグフィルタ内を複数の隔室に
区分して各隔室ごとに濾布を収納し、排煙処理に際して
は各隔室を排煙処理中の隔室と休止中の隔室とに分け、
排煙の浄化処理と濾布の再生とを繰り返すので、休止中
の隔室において、濾布にガスを逆流して濾布付着層を剥
離し、これを再生した後に隔室内に所要の排煙浄化物質
を流入させることによって、濾布表面を被覆することが
できるからである。
The method of forming a flue gas purification layer by coating the surface of a filter cloth with a required substance can be applied to a backwash type bag filter. In other words, the bag filter of this system divides the bag filter into a plurality of compartments and stores a filter cloth in each compartment, and in the smoke exhaust treatment, each compartment is suspended from the compartment during smoke exhaust treatment. Divided into the inner compartment,
Since the exhaust gas purification process and the filter cloth regeneration are repeated, the backflow of gas to the filter cloth in the resting room removes the filter cloth adhering layer, and after regenerating this, the required smoke exhaust in the compartment. This is because the surface of the filter cloth can be covered by inflowing the purifying substance.

【0008】しかるに、この方法は、小型であることな
どから現在多く使用されているパルスジェット方式のバ
グフィルタには適用することができない。すなわち、本
方式のバグフィルタは、濾布付着層の払い落し装置とし
て、バグフィルタの運転を継続したまま、同一室内に配
置された濾布の一部ずつに順次加圧空気を噴射して当該
噴射部分の濾布付着層を剥離させ、濾布を順次部分的に
再生させるパルスジェット型再生装置を用いるので、濾
布に排煙浄化層を形成すべく、バグフィルタの入口より
排煙浄化物質を導入しても、当該所要の物質が再生され
た濾布の表面に達するより前に、剥離層の一部が濾布に
再付着してしまうからである。また、同一室内にバグフ
ィルタが収納されているため、バグフィルタの入口より
排煙浄化物質を導入すると、当該物質が再生処理が行わ
れていない濾布の付着層上に堆積されるので、排煙浄化
物質が無駄に消費されるという不都合もある。したがっ
て、パルスジェット方式のバグフィルタにおいては、装
置の起動時を除いて、濾布の表面に排煙浄化物質を被覆
し、排煙浄化層を形成する方法は、実際に使用され難
い。
However, this method cannot be applied to the pulse jet type bag filter which is widely used at present because of its small size. That is, the bag filter of the present system serves as a device for removing the filter cloth adhering layer by sequentially injecting pressurized air to each of the filter cloths arranged in the same chamber while continuing the operation of the bag filter. Since the pulse jet type regenerator is used to peel off the filter cloth adhering layer at the injection part and regenerate the filter cloth partially in sequence, in order to form the smoke cleaning layer on the filter cloth, the smoke cleaning substance is introduced from the inlet of the bag filter. This is because even if the above is introduced, a part of the release layer is redeposited on the filter cloth before the required substance reaches the surface of the regenerated filter cloth. In addition, since the bag filter is housed in the same room, when the flue gas purifying substance is introduced from the inlet of the bag filter, the substance is deposited on the adhering layer of the filter cloth that has not been subjected to the regenerating process, so There is also the inconvenience that the smoke purification substance is wasted. Therefore, in the pulse jet type bag filter, the method of coating the surface of the filter cloth with the flue gas purifying substance to form the flue gas purifying layer is difficult to actually use except when the apparatus is started.

【0009】尚、前出の逆洗方式のバグフィルタにおい
ては、例えば特開昭62−74439号公報に記載され
ているように、濾布の表面に付着される濾過助剤と、当
該付着層上にアルカリ剤と共に積層される濾過助剤とし
て、同じ物質が用いられている。しかるに、濾布の表面
に付着される濾過助剤には、主として剥離性の改善、濾
布の目詰まり防止、濾布を通過する微量成分の吸着とい
う機能が要求されるのに対して、この上にアルカリ剤と
共に積層される濾過助剤には、主に通気性を改善すると
いう機能が要求されるのであって、同一の物質を用いた
場合には、これらの機能を充分に発揮することがむずか
しい。
In the backwashing type bag filter described above, as described in, for example, Japanese Patent Application Laid-Open No. 62-74439, a filter aid attached to the surface of the filter cloth and the attached layer. The same material is used as a filter aid layered on top with an alkaline agent. However, the filter aid adhering to the surface of the filter cloth is required to mainly have the functions of improving peelability, preventing clogging of the filter cloth, and adsorbing trace components passing through the filter cloth. The filter aid laminated on top of the alkaline agent is mainly required to have the function of improving air permeability, and when the same substance is used, these functions should be sufficiently exhibited. It's difficult.

【0010】本発明は、かかる従来技術の不都合を解消
するためになされたものであって、パルスジェット方式
のバグフィルタ濾布への任意の物質あるいは2以上の任
意の物質の組合せからなる排煙浄化層の形成を可能に
し、濾布の保護効果と燃焼排煙中の有害物質の除去効率
を高めることを目的とする。
The present invention has been made in order to eliminate the disadvantages of the prior art, and is a flue gas composed of an arbitrary substance or a combination of two or more substances on a pulse jet bag filter cloth. The purpose is to enable the formation of a purification layer and to enhance the protective effect of the filter cloth and the efficiency of removing harmful substances in the combustion flue gas.

【0011】[0011]

【課題を解決するための手段】本発明は、前記の課題を
解決するため、複数個の濾布と、各濾布ごとに対応して
設けられた加圧ガス噴射口より加圧ガスを順次所定の周
期で噴射し、当該加圧ガスが噴射された濾布の付着物を
選択的に払い落すパルスジェット型再生装置を備えたバ
グフィルタにおいて、前記各濾布ごとに、その表面に、
濾過助剤、燃焼排煙中の酸性ガスを吸収するアルカリ性
物質及び燃焼排煙中の特定の有害物質を吸着する吸着剤
から選択される少なくとも1種類の排煙浄化物質を噴射
する噴射口を設け、前記加圧ガス噴射口より加圧ガスを
噴射して当該加圧ガス噴射口に対応する濾布の付着物を
払い落した後、直ちに前記排煙浄化物質噴射口より当該
付着物の払い落しが行われた濾布に前記排煙浄化物質を
噴射し、前記濾布ごとに所定の周期で繰り返し排煙浄化
層を被覆する構成にした。
In order to solve the above-mentioned problems, the present invention sequentially applies pressurized gas from a plurality of filter cloths and a pressurized gas injection port provided corresponding to each filter cloth. In a bag filter equipped with a pulse jet type regenerator that sprays at a predetermined cycle and selectively blows off the deposits of the filter cloth on which the pressurized gas is sprayed, for each of the filter cloths, on its surface,
An injection port for injecting at least one type of flue gas purification substance selected from a filter aid, an alkaline substance that absorbs acid gas in combustion flue gas, and an adsorbent that adsorbs a specific harmful substance in combustion flue gas is provided. After the pressurized gas is jetted from the pressurized gas jet port to remove the deposits on the filter cloth corresponding to the pressurized gas jet port, immediately after the exhaust gas purifying substance jet port is slid off the deposits. The flue gas purifying substance was sprayed on the filter cloth subjected to the above step, and the flue gas purifying layer was repeatedly coated on each of the filter cloths at a predetermined cycle.

【0012】また、1つの濾布を複数個の部分に分割し
てなる濾布を有するパルスジェット型再生装置を備えた
バグフィルタにおいては、前記濾布の各部分ごとに、当
該部分の表面に、濾過助剤、燃焼排煙中の酸性ガスを中
和するアルカリ性物質及び燃焼排煙中の特定の有害物質
を吸着する吸着剤から選択される少なくとも1種類の排
煙浄化物質を噴射する噴射口を設け、前記加圧ガス噴射
口より加圧ガスを噴射して当該加圧ガス噴射口に対応す
る部分の付着物を払い落した後、直ちに前記排煙浄化物
質噴射口より当該付着物の払い落しが行われた部分に前
記排煙浄化物質を噴射し、前記濾布の各部分ごとに所定
の周期で繰り返し排煙浄化層を被覆する構成にした。
Further, in a bag filter provided with a pulse jet type regenerator having a filter cloth formed by dividing one filter cloth into a plurality of parts, each part of the filter cloth is attached to the surface of the part. Injection port for injecting at least one flue gas purifying substance selected from a filter aid, an alkaline substance that neutralizes acid gas in combustion flue gas, and an adsorbent that adsorbs a specific harmful substance in combustion flue gas Is provided, the pressurized gas is jetted from the pressurized gas jet port to remove the deposits at the portion corresponding to the pressurized gas jet port, and immediately after the exhaust gas purifying substance jet port is dispensed. The flue gas purifying substance is sprayed onto the dropped portion, and the flue gas purifying layer is repeatedly coated on each portion of the filter cloth at a predetermined cycle.

【0013】排煙浄化層は、前記排煙浄化物質噴射口よ
り濾過助剤を噴射して濾布の表面に当該濾過助剤を付着
すると共に、バグフィルタの上流で排煙中に濾過助剤が
混入されたアルカリ性物質を添加し、濾布の表面に被覆
された濾過助剤層の表面に、燃焼排煙と共にバグフィル
タ中に導入された濾過助剤及びアルカリ性物質からなる
層を積層することによっても形成できる。この場合、排
煙浄化物質噴射口より噴射される濾過助剤としては、剥
離性の改善及び濾布の目詰まり防止に有効な物質を用
い、前記排煙中に添加される濾過助剤としては、通気性
を改善するに有効な物質を用いることが好ましい。ま
た、排煙浄化物質噴射口より噴射される濾過助剤中に
は、排煙中の有害物質を吸着する吸着剤を混入すること
が好ましい。
The flue gas purification layer injects the filter aid from the flue gas purifying substance injection port to adhere the filter aid to the surface of the filter cloth, and at the same time as the filter aid is in the flue gas upstream of the bag filter. Adding an alkaline substance mixed with the above, and laminating a layer consisting of the filter aid and the alkaline substance introduced into the bag filter together with the combustion exhaust gas on the surface of the filter aid layer coated on the surface of the filter cloth. Can also be formed by. In this case, as the filter aid injected from the flue gas purifying substance injection port, a substance effective for improving the peelability and preventing clogging of the filter cloth is used, and as the filter aid added to the flue gas, It is preferable to use a substance effective for improving air permeability. Further, it is preferable that an adsorbent that adsorbs harmful substances in the flue gas is mixed in the filter aid injected from the flue gas purification substance injection port.

【0014】[0014]

【作用】複数個備えられた各濾布ごとに対応して、加圧
ガス噴射口と排煙浄化物質噴射口とを設け、加圧ガス噴
射口より加圧ガスを噴射して当該加圧ガス噴射口に対応
する濾布の付着物を払い落した後、直ちに当該濾布に対
応して設けられた排煙浄化物質噴射口より所望の排煙浄
化物質を噴射すると、剥離された物質が濾布に再付着す
る以前に濾布の表面に排煙浄化層を形成することができ
る。また、浄化物質噴射口より噴射される物質の種類や
組成、噴射量、噴射時間、それに噴射時期等を制御する
ことによって、排煙浄化層中の物質の分布を任意に制御
できる。したがって、各濾布ごとに、付着物質の払い落
しと排煙浄化層の形成とを順次繰り返すことによって、
バグフィルタを休止することなく、パルスジェット方式
のバグフィルタ濾布に継続的に所望の排煙浄化層を形成
できる。
Operation: A pressurizing gas injection port and a smoke purification substance injection port are provided corresponding to each of the plural filter cloths, and the pressurizing gas is injected from the pressurization gas injection port. Immediately after the deposits on the filter cloth corresponding to the injection port are wiped off, when the desired flue gas purification substance is injected from the flue gas purification substance injection port provided corresponding to the filter cloth, the separated substance is filtered. A flue gas cleaning layer can be formed on the surface of the filter cloth prior to reattachment to the cloth. Further, the distribution of the substance in the flue gas purification layer can be arbitrarily controlled by controlling the type and composition of the substance injected from the purification substance injection port, the injection amount, the injection time, the injection timing, and the like. Therefore, for each filter cloth, by sequentially removing the adhered substances and forming the flue gas purification layer,
The desired flue gas purification layer can be continuously formed on the pulse jet type bag filter cloth without stopping the bag filter.

【0015】例えば、加圧ガスを噴射することによって
再生された濾布に、浄化物質噴射口より濾過助剤を噴射
すれば、煤塵等が再付着する前に濾布の表面に濾過助剤
の皮膜を形成できるので、濾布の損傷を防止できる。こ
の場合、浄化物質噴射口からは任意の濾過助剤を噴射す
ることができるので、例えば活性炭粉末など、剥離性が
良好で濾布の目詰まり防止に効果があり、かつ塩化物や
ダイオキシン等の有害成分の吸着に優れている物質を噴
射することができる。
For example, if a filter aid is sprayed from the purifying substance injection port to the filter cloth regenerated by spraying a pressurized gas, the filter aid may be sprayed on the surface of the filter cloth before dust and the like are reattached. Since a film can be formed, damage to the filter cloth can be prevented. In this case, since any filter aid can be injected from the purification substance injection port, for example, activated carbon powder or the like, it has good peelability and is effective in preventing clogging of the filter cloth, and chloride, dioxin, etc. It is possible to inject a substance excellent in adsorption of harmful components.

【0016】さらに、かかる物質を用いて濾布の表面に
排煙浄化層を形成した後、バグフィルタに導入される排
煙中に、酸性ガスの吸収に効果がある消石灰を添加し、
排煙浄化層上に煤塵と共に堆積させれば、排煙中の酸性
ガスを除去できる。バグフィルタに導入される排煙中に
は、消石灰と共に濾過助剤を添加することもできる。こ
の場合、消石灰と共に排煙中に添加される濾過助剤とし
て、例えばパーライトなど、排煙浄化層の通気性を改善
する物質を添加すれば、煤塵の堆積による濾過効率の低
下を緩和できる。
Furthermore, after forming a flue gas purification layer on the surface of the filter cloth using such a substance, slaked lime effective in absorbing acid gas is added to flue gas introduced into the bag filter,
The acid gas in the flue gas can be removed by depositing it together with soot and dust on the flue gas purification layer. A filter aid may be added together with slaked lime in the flue gas introduced into the bag filter. In this case, if a substance such as pearlite that improves the air permeability of the flue gas purification layer is added as a filter aid to be added to flue gas together with slaked lime, it is possible to mitigate the decrease in filtration efficiency due to the accumulation of dust.

【0017】複数個の濾布を備えるのではなく、1つの
濾布を複数の部分に分割し、各部分ごとに再生を繰り返
すバグフィルタについても、前記と同様の方法で、再生
直後の部分に選択的に排煙浄化層を形成することができ
る。
A bag filter, which is not provided with a plurality of filter cloths, is divided into a plurality of filter cloths and the reproduction is repeated for each portion. A flue gas purification layer can be selectively formed.

【0018】[0018]

【実施例】図1に、本例に係る排煙浄化層の形成方法を
実行するためのパルスジェット方式のバグフィルタを含
む排煙処理装置を示す。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a flue gas treatment apparatus including a pulse jet type bag filter for carrying out the flue gas purification layer forming method according to this embodiment.

【0019】この図において、51はごみ焼却炉、52
はごみ焼却炉51で発生する燃焼排煙の冷却塔、53は
冷却塔52で温度調整された燃焼排煙を浄化するバグフ
ィルタを示している。バグフィルタ53内は、上下両端
が開放された複数(図では3つ)の隔室73,74,7
5に分割されており、各隔室73,74,75内には、
それぞれ多数の筒状の濾布が設定されている(図示省
略)。各隔室73,74,75の上方には、各隔室内に
設定された図示しない濾布に加圧空気を噴射する加圧空
気噴射口80,81,82が設けられ、また、前記各隔
室73,74,75内には、濾過助剤の噴射口77,7
8,79が設けられている。尚、隔室数は、多いほど排
煙の流れが均一化されるので、均一な浄化処理を行う上
で有利であるが、その反面、構造が複雑になって高価に
なるため、両者を勘案して適当な数に設定される。
In this figure, 51 is a refuse incinerator, and 52 is a waste incinerator.
A cooling tower for combustion flue gas generated in the refuse incinerator 51 and a bag filter 53 for purifying the combustion flue gas whose temperature is adjusted in the cooling tower 52 are shown. Inside the bag filter 53, a plurality of (three in the figure) compartments 73, 74, 7 whose upper and lower ends are opened.
It is divided into 5, and in each compartment 73,74,75,
A large number of tubular filter cloths are set for each (not shown). Above each of the compartments 73, 74, 75, there are provided pressurized air injection ports 80, 81, 82 for injecting pressurized air to a filter cloth (not shown) set in each of the compartments. In the chambers 73, 74, 75, there are injection ports 77, 7 for the filter aid.
8, 79 are provided. It should be noted that the larger the number of compartments, the more uniform the flow of exhaust gas, which is advantageous for uniform purification, but on the other hand, the structure becomes complicated and expensive, so consider both. And set to an appropriate number.

【0020】前記加圧空気の噴射口80,81,82
は、制御弁63を介して加圧空気ヘッダ60に接続され
ており、制御弁63を開閉することによって、各加圧空
気噴射口80,81,82に順次所定のタイミングで所
定の時間だけ、加圧空気ヘッダ60からの加圧空気が供
給されようになっている。制御弁63の開閉は、タイマ
61からの信号によって制御される。図中の符号104
は、タイマ61から制御弁63に印加される信号の信号
線を示している。
Injection ports 80, 81, 82 for the pressurized air
Is connected to the pressurized air header 60 via the control valve 63, and by opening and closing the control valve 63, the pressurized air injection ports 80, 81, 82 are sequentially and at predetermined timing for a predetermined time, Pressurized air is supplied from the pressurized air header 60. The opening / closing of the control valve 63 is controlled by a signal from the timer 61. Reference numeral 104 in the figure
Indicates a signal line of a signal applied from the timer 61 to the control valve 63.

【0021】濾過助剤の噴射口77,78,79は、制
御弁62を介して、濾過助剤供給器57、消石灰供給器
58、及び搬送ガス供給用のブロワ56に接続されてお
り、制御弁62を開閉することによって、各濾過助剤の
噴射口77,78,79に順次所定のタイミングで、搬
送ガスによって搬送された濾過助剤及び/又は消石灰が
供給されようになっている。制御弁62の開閉並びに濾
過助剤供給器57及び消石灰供給器58の駆動は、タイ
マ59からの信号によって制御される。なお、図中の符
号101〜103は、タイマ59から制御弁62並びに
濾過助剤供給器57及び消石灰供給器58に印加される
信号の信号線を示しており、符号105は、タイマ59
とタイマ61とを同期させるための同期信号線を示して
いる。
The injection ports 77, 78, 79 of the filter aid are connected to the filter aid supply device 57, the slaked lime supply device 58, and the blower 56 for supplying the carrier gas through the control valve 62, and the control is performed. By opening and closing the valve 62, the filter aid and / or slaked lime carried by the carrier gas are sequentially supplied to the injection ports 77, 78, 79 of each filter aid at a predetermined timing. The opening and closing of the control valve 62 and the driving of the filter aid supply device 57 and the slaked lime supply device 58 are controlled by signals from the timer 59. Reference numerals 101 to 103 in the figure indicate signal lines of signals applied from the timer 59 to the control valve 62, the filter aid supply device 57 and the slaked lime supply device 58, and reference numeral 105 indicates a timer 59.
And a sync signal line for synchronizing the timer 61 with the timer 61.

【0022】冷却塔52とバグフィルタ53とをつなぐ
煙道94には、消石灰の連続供給管93が接続され、燃
焼排煙中に消石灰を連続的に供給できるようになってい
る。なお、この消石灰中には、濾過助剤を混入すること
もできる。バグフィルタ53には、前記の各隔室73,
74,75に対応して複数個の排煙流入口76が設けら
れており、ごみ焼却炉51で発生した燃焼排煙が、冷却
塔52、煙道94、排煙流入口76を経由して、バグフ
ィルタ53の各隔室73,74,75に導入される。図
中の符号54は燃焼排煙を吸引するブロワ、55は浄化
されたガスを大気に放出する煙突であって、バグフィル
タ53の出口煙道95に設けられる。
A continuous supply pipe 93 for slaked lime is connected to a flue 94 connecting the cooling tower 52 and the bag filter 53 so that slaked lime can be continuously supplied during combustion flue gas. A filter aid may be mixed in the slaked lime. The bag filter 53 includes the above-mentioned compartments 73,
A plurality of flue gas inlets 76 are provided corresponding to 74 and 75, and combustion flue gas generated in the refuse incinerator 51 passes through the cooling tower 52, the flue 94, and the flue gas inlet 76. , Bag filters 53 are introduced into the compartments 73, 74, 75. Reference numeral 54 in the figure is a blower that sucks combustion exhaust gas, and 55 is a chimney that discharges purified gas to the atmosphere, and is provided at the outlet flue 95 of the bag filter 53.

【0023】以下、本例装置の動作と排煙浄化層の形成
方法とについて説明する。
The operation of the apparatus of this example and the method for forming the exhaust gas purification layer will be described below.

【0024】ごみは、ごみ供給管91によってごみ焼却
炉51内に供給され、焼却される。ごみ焼却炉51で発
生した排煙は、冷却塔52にて浄化処理に好適な温度ま
で冷却され、さらに酸性ガスを除去するための消石灰及
び必要な場合には濾過助剤を連続供給管93から添加し
た後に、排煙流入口76を通ってバグフィルタ53内に
導入される。バグフィルタ3内に吸引された燃焼排煙
は、図示しない濾布で浄化され、ブロワ54に吸引され
て、煙突55より大気に放出される。
The waste is supplied into the waste incinerator 51 by the waste supply pipe 91 and incinerated. The flue gas generated in the refuse incinerator 51 is cooled in the cooling tower 52 to a temperature suitable for purification treatment, and further slaked lime for removing acid gas and, if necessary, a filter aid from the continuous supply pipe 93. After the addition, it is introduced into the bag filter 53 through the flue gas inlet port 76. The combustion flue gas sucked into the bag filter 3 is purified by a filter cloth (not shown), sucked by the blower 54, and discharged from the chimney 55 to the atmosphere.

【0025】濾布の再生は、加圧空気噴射口80,8
1,82のいずれかより、加圧空気を各隔室73,7
4,75に設定された濾布ごとに順次パルス状に吹き付
け、その衝撃力によって濾布に付着した物質を払い落す
ことにより行われる。各加圧空気噴射口80,81,8
2からの加圧空気の噴射タイミングは、タイマ61で制
御される。この場合、複数の隔室の濾布に同時に加圧空
気を噴射することもできるが、燃焼排煙の浄化処理を高
能率かつ安定に行うため、1つの隔室内の濾布の再生が
終わった段階で、次の隔室内の濾布の再生を行うという
方法を採ることがより好ましい。
Regeneration of the filter cloth is carried out by the pressurized air injection ports 80, 8
Compressed air from each of the compartments 73, 7
It is carried out by sequentially spraying in a pulse shape for each filter cloth set to 4, 75, and brushing off the substance adhering to the filter cloth by its impact force. Each pressurized air injection port 80, 81, 8
The injection timing of the pressurized air from 2 is controlled by the timer 61. In this case, although it is possible to inject the pressurized air to the filter cloths in a plurality of compartments at the same time, the regeneration of the filter cloths in one compartment is completed in order to efficiently and stably purify the combustion flue gas. It is more preferable to adopt a method of regenerating the filter cloth in the next compartment at the stage.

【0026】濾布への排煙浄化層の形成は、再生処理が
行われた直後の濾布に、濾過助剤噴射口77,78,7
9のいずれかより濾過助剤又は濾過助剤と消石灰との混
合物を噴射し、濾布の表面にこれらの物質を被覆するこ
とによって行われる。また、再生処理が行われた直後の
濾布に、まず濾過助剤を噴射し、次いでこの濾過助剤層
上に消石灰を噴射することもできる。このようにする
と、まず、濾布の表面に濾過助剤塔が被覆されて、濾布
が保護される。次いで、この濾過助剤層の上に、燃焼排
煙中の煤塵とそれに添加された消石灰並びに必要に応じ
て添加された濾過助剤の混合層が堆積されるので、これ
に排煙を通過させることによって、排煙の浄化を行うこ
とができる。
The flue gas purification layer is formed on the filter cloth by filtering the filter aid injection holes 77, 78, 7 on the filter cloth immediately after the regeneration treatment.
It is carried out by spraying a filter aid or a mixture of the filter aid and slaked lime from any of 9 to coat the surface of the filter cloth with these substances. It is also possible to first spray the filter aid on the filter cloth immediately after the regeneration treatment, and then spray slaked lime on the filter aid layer. In this case, first, the surface of the filter cloth is covered with the filter aid tower to protect the filter cloth. Then, on this filter aid layer, a mixed layer of soot dust in combustion flue gas, slaked lime added thereto, and filter aid added as necessary is deposited, so that the flue gas is passed therethrough. By doing so, the exhaust gas can be purified.

【0027】図2に、加圧空気の噴射タイミングと、濾
過助剤及び消石灰の噴射タイミングの一例を示す。本例
では、まずブロワ56を稼働させて再生直後の隔室に搬
送ガスを供給しつつ、加圧空気噴射口よりパルス状の加
圧空気を噴射させ、加圧空気遮断後直ちに濾過助剤噴射
口より濾過助剤を噴射している。そして、さらに濾過助
剤遮断後、濾過助剤噴射口より消石灰を噴射させ、消石
灰遮断後にブロワ56を停止している。このようにし
て、1つの隔室内の濾布に対する再生処理と排煙浄化層
の形成処理が終了したら、所定のタイミングで、他の隔
室内の濾布に対する再生処理と排煙浄化層の形成処理を
開始する。
FIG. 2 shows an example of the injection timing of the pressurized air and the injection timing of the filter aid and slaked lime. In this example, first, the blower 56 is operated to supply the carrier gas to the compartment immediately after the regeneration, and pulsed pressurized air is jetted from the pressurized air jet port, and the filter aid is jetted immediately after shutting off the pressurized air. A filter aid is sprayed from the mouth. Then, after the filter aid is blocked, slaked lime is injected from the filter aid injection port, and the blower 56 is stopped after the slaked lime is blocked. In this way, when the regeneration processing and the exhaust gas purification layer forming processing for the filter cloth in one compartment are completed, the regeneration processing and the exhaust gas purification layer forming processing for the filter cloth in the other compartment are completed at a predetermined timing. To start.

【0028】尚、前記実施例においては、濾過助剤噴射
口より濾過助剤と消石灰とを噴射するが、濾過助剤のみ
を噴射することもできるし、消石灰に代えて、又は消石
灰と共に他の物質、例えば排煙中の特定の有害物質を吸
収する吸着剤を噴射することもできる。
In the above embodiment, the filter aid and slaked lime are injected from the filter aid injection port, but it is also possible to inject only the filter aid, or instead of slaked lime or with slaked lime. It is also possible to inject a substance, for example an adsorbent which absorbs certain harmful substances in the flue gas.

【0029】次に、ガス浄化処理の試験例を示して、本
発明の効果を明らかにする。図3は、実験装置の構成図
である。この図において、3はバグフィルタであり、こ
のバグフィルタ3内には、ガラス繊維の織布で作製され
た直径80mm、長さ1000mmの筒状の濾布11,
12,13が3本内装されている。各濾布11,12,
13の開口端と対向する位置には、それぞれ加圧空気の
噴射口18,19,20が設けられている。さらに、各
濾布11,12,13の開口端寄りの外側部には、濾過
助剤の噴射口14,15,16が設けられている。
Next, the effect of the present invention will be clarified by showing a test example of gas purification treatment. FIG. 3 is a block diagram of the experimental apparatus. In this figure, 3 is a bag filter. Inside the bag filter 3, a cylindrical filter cloth 11 made of glass fiber woven cloth, having a diameter of 80 mm and a length of 1000 mm,
Three 12 and 13 are installed. Each filter cloth 11, 12,
Injection ports 18, 19, and 20 for pressurized air are provided at positions facing the open end of 13, respectively. Further, filter aid injection ports 14, 15 and 16 are provided on the outer side of the filter cloths 11, 12 and 13 near the open ends.

【0030】前記加圧空気の噴射口18,19,20
は、制御弁21を介して加圧空気ヘッダ6に接続されて
おり、制御弁21を開閉することによって、各加圧空気
噴射口18,19,20に順次所定のタイミングで所定
の時間だけ、加圧空気ヘッダ6からの加圧空気が供給さ
れようになっている。制御弁21の開閉は、タイマ5か
らの信号によって制御される。図中の符号41は、タイ
マ5から制御弁21に印加される信号の信号線を示して
いる。
Injection ports 18, 19, 20 for the pressurized air
Is connected to the pressurized air header 6 via the control valve 21, and by opening and closing the control valve 21, the pressurized air injection ports 18, 19 and 20 are sequentially and at predetermined timing for a predetermined time, The pressurized air from the pressurized air header 6 is supplied. The opening and closing of the control valve 21 is controlled by a signal from the timer 5. Reference numeral 41 in the drawing indicates a signal line of a signal applied from the timer 5 to the control valve 21.

【0031】濾過助剤の噴射口14,15,16は、搬
送ガスの加熱管17及び制御弁22を介して、濾過助剤
供給器8及び搬送ガス供給管9に接続されており、制御
弁22を開閉することによって、各濾過助剤の噴射口1
4,15,16に順次所定のタイミングで、搬送ガスに
よって搬送された濾過助剤が供給されようになってい
る。制御弁22の開閉及び搬送ガス供給管9に設定され
た制御弁23の開閉それに濾過助剤供給器8からの濾過
助剤の供給は、タイマ7からの信号によって制御され
る。図中の符号42、43は、タイマ7から制御弁2
2,23並びに濾過助剤供給器8に印加される信号の信
号線を示している。
The filter aid injection ports 14, 15 and 16 are connected to the filter aid supply device 8 and the carrier gas supply pipe 9 via the carrier gas heating pipe 17 and the control valve 22, and the control valve By opening and closing 22, the injection port 1 of each filter aid
The filter aid carried by the carrier gas is supplied to 4, 15, 16 at a predetermined timing. The opening and closing of the control valve 22, the opening and closing of the control valve 23 set in the carrier gas supply pipe 9, and the supply of the filter aid from the filter aid supply device 8 are controlled by a signal from the timer 7. Reference numerals 42 and 43 in the figure indicate from the timer 7 to the control valve 2
2 and 23 and signal lines of signals applied to the filter aid supply device 8 are shown.

【0032】バグフィルタ3の下部には、消石灰の供給
器2を有する被処理ガスの供給管35が連設され、バグ
フィルタ3の上部には、ブロワ4を有するガス排出管3
9が連設されている。被処理ガスの供給管35には、空
気導入管31と、空気導入管31から導入された空気を
加熱するヒータ1と、加熱された導入空気31に被処理
物質を添加するための混合ガス供給管32とが接続され
ている。
A feed pipe 35 for the gas to be treated having a slaked lime feeder 2 is connected to the lower portion of the bag filter 3, and a gas discharge pipe 3 having a blower 4 is provided above the bag filter 3.
9 are arranged in a row. An air introduction pipe 31, a heater 1 for heating the air introduced from the air introduction pipe 31, and a mixed gas supply for adding a substance to be treated to the heated introduction air 31 are supplied to the treatment gas supply pipe 35. The pipe 32 is connected.

【0033】本例の装置は、空気導入配管31より吸引
され、ヒータ1で加熱された空気に、混合ガス供給管3
2から供給される塩化水素及び水蒸気、それに消石灰供
給器2より供給される消石灰を添加して被処理ガスを生
成し、これをバグフィルタ3内の濾布11,12,13
で浄化処理する。濾布11,12,13の再生方法、並
びに濾布11,12,13への浄化層の形成方法につい
ては、図1の装置で説明したと同じであるので、重複を
避けるために説明を省略する。
In the apparatus of this example, the mixed gas supply pipe 3 is added to the air sucked from the air introduction pipe 31 and heated by the heater 1.
Hydrogen chloride and water vapor supplied from 2 and slaked lime supplied from the slaked lime feeder 2 are added to generate a gas to be treated, which is filtered in the bag filters 3, 12, 13 in the bag filter 3.
Purify with. The method of regenerating the filter cloths 11, 12, and 13 and the method of forming the purification layer on the filter cloths 11, 12, and 13 are the same as those described in the apparatus in FIG. To do.

【0034】〈試験例1〉バグフィルタ3内に、気温1
50℃、水蒸気濃度30%、塩化水素濃度1000pp
mの加熱空気を、通過速度0.8m/minで連続的に
導入しつつ、図2に示したタイミングで、濾布11,1
2,13のそれぞれに対する再生処理と排煙浄化層の形
成とを順次繰り返した。排煙浄化層の形成は、再生処理
が終了した直後の濾布に濾過助剤噴射口14,15,1
6のいずれかより濾過助剤Bを噴射すると共に、被処理
ガス中に消石灰供給器2からの消石灰及び濾過助剤Aを
添加し、濾布11,12,13のいずれかに新たに形成
された濾過助剤層上に、被処理ガス中に添加された消石
灰及び濾過助剤Aを堆積させることによって行った。被
処理ガス中に添加される消石灰濃度は、被処理ガス中に
添加された塩化水素と反応する理論量の3倍とし、被処
理ガス中に添加される濾過助剤Aの量は、消石灰の容積
の約1/3とした。また、濾過助剤噴射口14,15,
16から1回当り噴射する濾過助剤Bの量は、1サイク
ル前の濾過助剤Aの量の約1/15とした。濾過助剤A
及び濾過助剤Bとしては、共にパーライトを用いた。
<Test Example 1> In the bag filter 3, the temperature of 1
50 ℃, water vapor concentration 30%, hydrogen chloride concentration 1000pp
m of heated air was continuously introduced at a passage speed of 0.8 m / min, at the timings shown in FIG.
The regeneration treatment and the formation of the exhaust gas purification layer for each of Nos. 2 and 13 were sequentially repeated. The flue gas purification layer is formed on the filter cloth immediately after the regeneration process is completed by the filter aid injection ports 14, 15, 1
6 while injecting the filter aid B from any one of 6 and adding the slaked lime from the slaked lime feeder 2 and the filter aid A into the gas to be treated, it is newly formed on any of the filter cloths 11, 12, and 13. The slaked lime added to the gas to be treated and the filter aid A were deposited on the filter aid layer. The concentration of slaked lime added to the gas to be treated is three times the theoretical amount that reacts with hydrogen chloride added to the gas to be treated, and the amount of the filter aid A added to the gas to be treated is The volume was set to about 1/3. In addition, the filter aid injection ports 14, 15,
The amount of the filter aid B sprayed from 16 times per time was about 1/15 of the amount of the filter aid A one cycle before. Filter aid A
As the filter aid B and perlite, pearlite was used.

【0035】〈試験例2〉濾過助剤噴射口14,15,
16から濾過助剤Bを噴射せず、被処理ガス中に添加さ
れた消石灰及び濾過助剤Aによってのみ、排煙浄化層を
形成した。その他の条件については、試験例1と同じに
した。
<Test Example 2> Filter aid injection ports 14, 15,
The filter aid B was not sprayed from 16 and the flue gas purification layer was formed only by the slaked lime and the filter aid A added to the gas to be treated. Other conditions were the same as in Test Example 1.

【0036】〈試験例3〉再生直後の濾布のみならず、
再生処理がなされていない他の濾布に対しても、濾過助
剤噴射口14,15,16より濾過助剤Bを噴射した。
その他の条件については、試験例1と同じにした。
<Test Example 3> Not only the filter cloth immediately after being recycled,
The filter aid B was also sprayed from the filter aid injection ports 14, 15, 16 to the other filter cloths that had not been subjected to the regeneration treatment.
Other conditions were the same as in Test Example 1.

【0037】表1にその試験結果を示す。試験は、再生
を50サイクル繰り返した後の再生直後の濾布の通風圧
力損失(単位;mmAq)と、51サイクル目の再生直
後の濾布に含まれる単位面積当りの塩化カルシウム含有
量(単位;g/m2 )を測定することによって行った。
通風圧力損失は、小さいほどブロワ4の動力が少なくな
るので好ましい。また、濾布中の塩素含有値は、小さい
ほど濾布の中に濾布を閉塞させる塩化物が侵入していな
いことを示すので好ましい。
Table 1 shows the test results. In the test, the ventilation pressure loss (unit: mmAq) of the filter cloth immediately after regeneration after repeating the regeneration for 50 cycles, and the calcium chloride content per unit area (unit: mmAq) contained in the filter cloth immediately after regeneration at the 51st cycle. g / m 2 ) was measured.
The smaller the ventilation pressure loss is, the less the power of the blower 4 is, which is preferable. In addition, the smaller the chlorine content value in the filter cloth, the more preferable it is because chlorides that block the filter cloth do not enter the filter cloth.

【0038】[0038]

【表1】 [Table 1]

【0039】この表から明らかなように、試験例1の方
法(本発明の方法)で再生直後の濾布にのみ濾過助剤B
を噴射すると、濾過助剤Bを噴射口から噴射しない試験
例2の方法(従来方法)による場合に比べて、濾布の通
風圧力損失が135mmAqから93mmAqに低下
し、また濾布に付着する塩化カルシウム量も1.05g
/m2 から0.11g/m2 に低下する。したがって、
試験例1の方法は、試験例2の方法に比べて、濾布の目
詰まり防止に顕著な効果があることが判る。試験例3の
方法で再生直後の濾布のみならず再生処理が行われてい
ない濾布に対しても濾過助剤Bを噴射した場合にも、試
験例2の方法による場合に比べて、濾布の通風圧力損失
が135mmAqから98mmAqに低下し、また濾布
に付着する塩化カルシウム量も1.05g/m2 から
0.10g/m2 に低下する。したがって、試験例3の
方法も、濾布の目詰まり防止に関しては、試験例2の方
法に比べて、顕著な効果があると言える。しかし、試験
例3の方法によると、再生処理が行われる以前の濾布に
対しても濾過助剤Bを噴射するので、濾過助剤が無駄に
なるだけでなく、被処理ガスの浄化処理が一時的に停止
したり、噴射時に濾過助剤Bが煙道39に逆流するとい
う不都合が発生した。したがって、試験例1の方法が、
濾布の目詰まり防止し、濾過助剤の無駄をなくし、かつ
被処理ガスの浄化処理を安定に行う上で最も好ましいこ
とが判った。
As is clear from this table, the filter aid B is only applied to the filter cloth immediately after being regenerated by the method of Test Example 1 (the method of the present invention).
In comparison with the case of the method of Test Example 2 (conventional method) in which the filter aid B is not injected from the injection port, the ventilation pressure loss of the filter cloth decreases from 135 mmAq to 93 mmAq, and the chloride attached to the filter cloth The amount of calcium is 1.05g
/ M 2 to 0.11 g / m 2 . Therefore,
It can be seen that the method of Test Example 1 is more effective in preventing clogging of the filter cloth than the method of Test Example 2. When the filter aid B was sprayed not only on the filter cloth immediately after being regenerated by the method of Test Example 3 but also on the filter cloth which was not subjected to the regenerating treatment, compared with the case of the method of Test Example 2, The ventilation pressure loss of the cloth decreases from 135 mmAq to 98 mmAq, and the amount of calcium chloride attached to the filter cloth also decreases from 1.05 g / m 2 to 0.10 g / m 2 . Therefore, it can be said that the method of Test Example 3 has a remarkable effect as compared with the method of Test Example 2 in terms of preventing clogging of the filter cloth. However, according to the method of Test Example 3, since the filter aid B is sprayed even on the filter cloth before the regeneration process, not only the filter aid is wasted, but also the purification treatment of the gas to be treated is performed. Inconveniences have occurred in that the filter aid B is temporarily stopped or the filter aid B flows back into the flue 39 during injection. Therefore, the method of Test Example 1 is
It has been found that it is most preferable for preventing clogging of the filter cloth, eliminating the waste of the filter aid, and stably purifying the gas to be treated.

【0040】次に、図3の試験装置を用いて行ったフェ
ノールの除去試験結果を示す。被処理ガス中へのフェノ
ール含有ガスの添加は、混合ガス供給管32から被処理
ガス供給管35にフェノール含有ガスを添加することに
よって行った。また、被処理ガスの温度は、ヒータ1に
よって100℃に調整した。その他の試験条件について
は、前記の試験例1〜3と同じにした。
Next, the results of the phenol removal test conducted using the test apparatus of FIG. 3 will be shown. The addition of the phenol-containing gas into the gas to be treated was performed by adding the phenol-containing gas from the mixed gas supply pipe 32 to the gas to be treated supply pipe 35. Further, the temperature of the gas to be processed was adjusted to 100 ° C. by the heater 1. Other test conditions were the same as those in Test Examples 1 to 3 above.

【0041】表2に、各試験例に係る濾過助剤噴射口1
4,15,16から噴射される濾過助剤Bと、被処理ガ
ス中に添加される濾過助剤Aとの組合せを示す。
Table 2 shows the filter aid injection port 1 according to each test example.
The combination of the filter aid B injected from Nos. 4, 15 and 16 and the filter aid A added to the gas to be treated is shown.

【0042】[0042]

【表2】 [Table 2]

【0043】表3に、各試験例の通風圧力損失とバグフ
ィルタ3の出口におけるフェノール濃度とを示す。
Table 3 shows the ventilation pressure loss and the phenol concentration at the outlet of the bag filter 3 in each test example.

【0044】[0044]

【表3】 [Table 3]

【0045】表3から明らかなように、濾過助剤噴射口
14,15,16から噴射される濾過助剤Bとして活性
炭粉末を用い、被処理ガス中に添加される濾過助剤Aと
してパーライトを用いた場合(試験例4)、通風圧力損
失及びバグフィルタ3の出口におけるフェノール濃度が
共に最低レベルになる。濾過助剤A,Bとして共に活性
炭粉末を用いると(試験例5)、バグフィルタ3の出口
におけるフェノール濃度が17ppmと最も低くなる
が、濾布の通風圧力損失が126mmAqと高くなる。
また、濾過助剤A,Bとして共にパーライトを用いると
(試験例6)、濾布の通風圧力損失が92mmAqと最
も低くなるが、バグフィルタ3の出口におけるフェノー
ル濃度が82ppmと最も高くなる。濾過助剤を用いな
い場合(試験例7)の場合には、濾布の通風圧力損失が
178mmAqと最も高くなり、バグフィルタ3の出口
におけるフェノール濃度が75ppmと高レベルにな
る。
As is clear from Table 3, activated carbon powder was used as the filter aid B injected from the filter aid injection ports 14, 15 and 16, and pearlite was used as the filter aid A added to the gas to be treated. When used (Test Example 4), the ventilation pressure loss and the phenol concentration at the outlet of the bag filter 3 are both at the lowest level. When activated carbon powder is used as both the filter aids A and B (Test Example 5), the phenol concentration at the outlet of the bag filter 3 is the lowest at 17 ppm, but the ventilation pressure loss of the filter cloth is as high as 126 mmAq.
When perlite was used as both the filter aids A and B (Test Example 6), the ventilation pressure loss of the filter cloth was the lowest at 92 mmAq, but the phenol concentration at the outlet of the bag filter 3 was the highest at 82 ppm. In the case of not using the filter aid (Test Example 7), the ventilation pressure loss of the filter cloth was the highest at 178 mmAq, and the phenol concentration at the outlet of the bag filter 3 was as high as 75 ppm.

【0046】したがって、これらの試験結果から、濾布
の表面に活性炭粉末を被覆し、次いでこの活性炭粉末層
に消石灰とパーライトの混在層を堆積させる排煙浄化層
の形成方法が、通風圧力損失を低くし、かつ排煙中の有
機化合物の除去性能を高めるのに有効であることが判
る。
Therefore, from these test results, the method of forming the flue gas purification layer in which the surface of the filter cloth is coated with the activated carbon powder, and then the mixed layer of slaked lime and perlite is deposited on the activated carbon powder layer causes the ventilation pressure loss. It can be seen that it is effective in lowering and enhancing the removal performance of organic compounds in flue gas.

【0047】[0047]

【発明の効果】以上説明したように、本発明によると、
複数個備えられた各濾布ごとに対応して、加圧ガス噴射
口と排煙浄化物質噴射口とを設け、加圧ガス噴射口より
加圧ガスを噴射して当該加圧ガス噴射口に対応する濾布
の付着物を払い落した後、直ちに当該濾布に対応して設
けられた排煙浄化物質噴射口より所望の排煙浄化物質を
噴射するようにしたので、剥離された物質が濾布に再付
着する以前に濾布の表面に排煙浄化層を形成することが
できる。また、浄化物質噴射口より噴射される物質の種
類や組成、噴射量、噴射時間、それに噴射時期等を制御
することによって、排煙浄化層中の物質の分布を任意に
制御できる。したがって、各濾布ごとに、付着物質の払
い落しと排煙浄化層の形成とを順次繰り返すことによっ
て、バグフィルタを休止することなく、パルスジェット
方式のバグフィルタ濾布に継続的に所望の排煙浄化層を
形成できる。
As described above, according to the present invention,
A pressurizing gas injection port and a flue gas purifying substance injection port are provided for each of the plurality of filter cloths, and the pressurizing gas is injected from the pressurizing gas injection port to the pressurizing gas injection port. Immediately after removing the deposits on the corresponding filter cloth, the desired flue gas purifying substance was injected from the flue gas purifying substance injection port provided corresponding to the filter cloth. A flue gas cleaning layer can be formed on the surface of the filter cloth before being redeposited on the filter cloth. Further, the distribution of the substance in the flue gas purification layer can be arbitrarily controlled by controlling the type and composition of the substance injected from the purification substance injection port, the injection amount, the injection time, the injection timing, and the like. Therefore, for each filter cloth, the removal of the adhering substances and the formation of the exhaust gas purification layer are sequentially repeated, so that the bag jet filter cloth of the pulse jet method can be continuously discharged without stopping the bag filter. A smoke purification layer can be formed.

【図面の簡単な説明】[Brief description of drawings]

【図1】実施例に係る排煙浄化設備の構成図である。FIG. 1 is a configuration diagram of a flue gas purifying facility according to an embodiment.

【図2】濾布再生用加圧空気の噴射タイミングと、濾布
表面への排煙浄化物質の噴射タイミングとを示すタイミ
ング図である。
FIG. 2 is a timing diagram showing an injection timing of pressurized air for filter cloth regeneration and an injection timing of a flue gas purifying substance on the surface of the filter cloth.

【図3】試験用排煙浄化モデルの構成図である。FIG. 3 is a configuration diagram of a test flue gas purification model.

【符号の説明】[Explanation of symbols]

51 ごみ焼却炉 52 冷却塔 53 バグフィルタ 56 ブロワ 57 濾過助剤供給器 58 消石灰供給器 60 加圧空気ヘッダ 59,61 タイマ 62,63 制御弁 73,74,75 隔室 80,81,82 加圧空気噴射口 51 waste incinerator 52 cooling tower 53 bag filter 56 blower 57 filter aid supplier 58 slaked lime supplier 60 pressurized air header 59, 61 timer 62, 63 control valve 73, 74, 75 compartment 80, 81, 82 pressurized Air jet

───────────────────────────────────────────────────── 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 53/34 ZAB 53/81 ZAB B01D 53/34 ZAB (72)発明者 山本 学 広島県呉市宝町3番36号 バブコック日立 株式会社呉研究所内 (72)発明者 藤田 一紀 広島県呉市宝町3番36号 バブコック日立 株式会社呉研究所内 (72)発明者 千手 透 広島県呉市宝町6番9号 バブコック日立 株式会社呉工場内─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification number Reference number within the agency FI Technical display location B01D 53/34 ZAB 53/81 ZAB B01D 53/34 ZAB (72) Inventor Manabu Yamamoto Kure City, Hiroshima Prefecture Takaramachi 3-36 Babcock Hitachi Co., Ltd. Kure Research Institute (72) Inventor Kazuki Fujita 3-36 Takaracho, Kure City, Hiroshima Prefecture Babcock Hitachi Co. No. 9 Babcock Hitachi Kure Factory

Claims (5)

【特許請求の範囲】[Claims] 【請求項1】 複数個の濾布と、各濾布ごとに対応して
設けられた加圧ガス噴射口より加圧ガスを順次所定の周
期で噴射し、当該加圧ガスが噴射された濾布の付着物を
選択的に払い落すパルスジェット型再生装置を備えたバ
グフィルタにおいて、前記各濾布ごとに、その表面に、
濾過助剤、排煙中の酸性ガスを吸収するアルカリ性物質
及び排煙中の特定の有害物質を吸着する吸着剤から選択
される少なくとも1種類の排煙浄化物質を噴射する噴射
口を設け、前記加圧ガス噴射口より加圧ガスを噴射して
当該加圧ガス噴射口に対応する濾布の付着物を払い落し
た後、直ちに前記排煙浄化物質噴射口より当該付着物の
払い落しが行われた濾布に前記排煙浄化物質を噴射し、
前記濾布ごとに所定の周期で繰り返し排煙浄化層を被覆
することを特徴とする排煙浄化層の形成方法。
1. A plurality of filter cloths, and a pressurized gas injection port provided corresponding to each filter cloth, sequentially injecting a pressurized gas at a predetermined cycle, and the pressurized gas is injected into the filter. In a bag filter equipped with a pulse jet regenerator that selectively removes cloth deposits, for each filter cloth, on its surface,
An injection port for injecting at least one type of flue gas purification substance selected from a filter aid, an alkaline substance that absorbs acid gas in flue gas, and an adsorbent that adsorbs a specific harmful substance in flue gas is provided. Pressurized gas is jetted from the pressurized gas jet port to remove the deposits on the filter cloth corresponding to the pressurized gas jet port, and immediately after that, the deposits are removed from the smoke purification substance jet port. Spray the flue gas purifying substance on the broken filter cloth,
A method for forming a flue gas purification layer, which comprises repeatedly coating the flue gas purification layer on each filter cloth at a predetermined cycle.
【請求項2】 複数個の部分に分割された濾布と、該濾
布の前記各部分ごとに対応して設けられた加圧ガス噴射
口より加圧ガスを順次所定の周期で噴射し、当該加圧ガ
スが噴射された部分の付着物を選択的に払い落すパルス
ジェット型再生装置を備えたバグフィルタにおいて、前
記濾布の各部分ごとに、当該部分の表面に、濾過助剤、
排煙中の酸性ガスを中和するアルカリ性物質及び排煙中
の特定の有害物質を吸着する吸着剤から選択される少な
くとも1種類の排煙浄化物質を噴射する噴射口を設け、
前記加圧ガス噴射口より加圧ガスを噴射して当該加圧ガ
ス噴射口に対応する部分の付着物を払い落した後、直ち
に前記排煙浄化物質噴射口より当該付着物の払い落しが
行われた部分に前記排煙浄化物質を噴射し、前記濾布の
各部分ごとに所定の周期で繰り返し排煙浄化層を被覆す
ることを特徴とする排煙浄化層の形成方法。
2. A filter cloth divided into a plurality of parts, and a pressurized gas is injected from a pressurized gas injection port provided corresponding to each of the parts of the filter cloth in sequence at a predetermined cycle, In a bag filter equipped with a pulse jet regenerator that selectively blows off deposits of the portion where the pressurized gas is sprayed, for each portion of the filter cloth, on the surface of the portion, a filter aid,
An injection port for injecting at least one type of flue gas purifying substance selected from an alkaline substance that neutralizes acid gas in flue gas and an adsorbent that adsorbs a specific harmful substance in flue gas is provided,
Immediately after the pressurized gas is injected from the pressurized gas injection port to remove the deposits at the portion corresponding to the pressurized gas injection port, the deposits are removed from the smoke purification substance injection port. A method for forming a flue gas purification layer, comprising injecting the flue gas purification substance onto the exposed portion and repeatedly coating the flue gas purification layer on each portion of the filter cloth at a predetermined cycle.
【請求項3】 請求項1又は2に記載の方法において、
前記排煙浄化物質噴射口より濾過助剤を噴射して前記濾
布の表面に当該濾過助剤を付着すると共に、前記バグフ
ィルタの上流で前記排煙中に濾過助剤が混入されたアル
カリ性物質を添加し、濾布の表面に被覆された濾過助剤
層の表面に、前記排煙と共に前記バグフィルタ中に導入
された濾過助剤及びアルカリ性物質からなる層を堆積さ
せて排煙浄化層を形成することを特徴とする排煙浄化層
の形成方法。
3. The method according to claim 1 or 2, wherein
An alkaline substance in which a filter aid is sprayed from the exhaust gas purifying substance injection port to adhere the filter aid to the surface of the filter cloth, and the filter aid is mixed in the exhaust gas upstream of the bag filter. On the surface of the filter aid layer coated on the surface of the filter cloth, a layer comprising the filter aid and the alkaline substance introduced into the bag filter together with the exhaust gas is deposited to form an exhaust gas purification layer. A method for forming a flue gas purification layer, which comprises forming the flue gas purification layer.
【請求項4】 請求項3に記載の方法において、前記排
煙浄化物質噴射口より噴射される濾過助剤と、前記燃焼
排煙中に添加される濾過助剤として、それぞれ異なる種
類の濾過助剤を用いたことを特徴とする排煙浄化層の形
成方法。
4. The method according to claim 3, wherein different types of filter aids are used as the filter aid injected from the exhaust gas purification substance injection port and the filter aid added to the combustion exhaust gas. A method for forming a flue gas purification layer, which comprises using an agent.
【請求項5】 請求項3に記載の方法において、前記排
煙浄化物質噴射口より噴射される濾過助剤中に、前記有
害物質の吸着剤を混入することを特徴とする排煙浄化層
の形成方法。
5. The flue gas purification layer according to claim 3, wherein an adsorbent of the harmful substance is mixed in the filter aid injected from the flue gas purification substance injection port. Forming method.
JP6306375A 1994-12-09 1994-12-09 Formation of flue-gas purifying layer Pending JPH08155257A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6306375A JPH08155257A (en) 1994-12-09 1994-12-09 Formation of flue-gas purifying layer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6306375A JPH08155257A (en) 1994-12-09 1994-12-09 Formation of flue-gas purifying layer

Publications (1)

Publication Number Publication Date
JPH08155257A true JPH08155257A (en) 1996-06-18

Family

ID=17956285

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6306375A Pending JPH08155257A (en) 1994-12-09 1994-12-09 Formation of flue-gas purifying layer

Country Status (1)

Country Link
JP (1) JPH08155257A (en)

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Publication number Priority date Publication date Assignee Title
JPH10216463A (en) * 1997-01-31 1998-08-18 Nkk Corp Spraying method of slaked lime and adsorbent and device therefor
CN105999886A (en) * 2015-03-30 2016-10-12 日本斯频德制造株式会社 Exhaust gas treating apparatus using filter cloth and filter cloth used for exhaust gas treating apparatus
CN106693659A (en) * 2017-02-06 2017-05-24 上海康恒环境股份有限公司 Novel dust collector with deacidification effect and dust removing method of novel dust collector
JP2018066523A (en) * 2016-10-21 2018-04-26 日立造船株式会社 Drug dosing device and treatment equipment of flue gas
JP2020093205A (en) * 2018-12-11 2020-06-18 Jfeエンジニアリング株式会社 Exhaust gas treatment device and exhaust gas treatment method
CN117064678A (en) * 2023-10-16 2023-11-17 烟台市飞马医疗科技有限公司 Moxibustion physiotherapy couch clarification plant that discharges fume

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10216463A (en) * 1997-01-31 1998-08-18 Nkk Corp Spraying method of slaked lime and adsorbent and device therefor
CN105999886A (en) * 2015-03-30 2016-10-12 日本斯频德制造株式会社 Exhaust gas treating apparatus using filter cloth and filter cloth used for exhaust gas treating apparatus
JP2018066523A (en) * 2016-10-21 2018-04-26 日立造船株式会社 Drug dosing device and treatment equipment of flue gas
CN106693659A (en) * 2017-02-06 2017-05-24 上海康恒环境股份有限公司 Novel dust collector with deacidification effect and dust removing method of novel dust collector
JP2020093205A (en) * 2018-12-11 2020-06-18 Jfeエンジニアリング株式会社 Exhaust gas treatment device and exhaust gas treatment method
CN117064678A (en) * 2023-10-16 2023-11-17 烟台市飞马医疗科技有限公司 Moxibustion physiotherapy couch clarification plant that discharges fume
CN117064678B (en) * 2023-10-16 2024-01-09 烟台市飞马医疗科技有限公司 Moxibustion physiotherapy couch clarification plant that discharges fume

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