JPH09103626A - Dust removing apparatus - Google Patents
Dust removing apparatusInfo
- Publication number
- JPH09103626A JPH09103626A JP7265918A JP26591895A JPH09103626A JP H09103626 A JPH09103626 A JP H09103626A JP 7265918 A JP7265918 A JP 7265918A JP 26591895 A JP26591895 A JP 26591895A JP H09103626 A JPH09103626 A JP H09103626A
- Authority
- JP
- Japan
- Prior art keywords
- backwash
- gas
- backwashing
- nozzle
- valve
- 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 title claims abstract description 64
- 239000007789 gas Substances 0.000 claims description 124
- 238000011001 backwashing Methods 0.000 claims description 35
- 239000000567 combustion gas Substances 0.000 claims description 10
- 239000003245 coal Substances 0.000 claims description 7
- 230000000694 effects Effects 0.000 claims description 4
- 239000000446 fuel Substances 0.000 claims description 2
- 230000003134 recirculating effect Effects 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 26
- 230000007797 corrosion Effects 0.000 abstract description 9
- 238000005260 corrosion Methods 0.000 abstract description 9
- 239000003518 caustics Substances 0.000 abstract description 6
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 238000003786 synthesis reaction Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000009833 condensation Methods 0.000 description 3
- 230000005494 condensation Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000002309 gasification Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 150000003464 sulfur compounds Chemical class 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- TXKMVPPZCYKFAC-UHFFFAOYSA-N disulfur monoxide Inorganic materials O=S=S TXKMVPPZCYKFAC-UHFFFAOYSA-N 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical compound S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Protection Of Pipes Against Damage, Friction, And Corrosion (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、フィルタによって
高温含塵ガス中の塵を捕捉し、逆洗ガスでフィルタを逆
洗再生する逆洗装置を備えた脱塵装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dedusting device equipped with a backwashing device for trapping dust in high-temperature dust-containing gas by a filter and rewashing the filter by backwashing gas.
【０００２】[0002]
【従来の技術】フィルタで捕捉した塵を、フィルタの清
浄ガス側空間に逆洗ガスを注入することによって含塵ガ
スの濾過時とは逆方向の差圧をフィルタ壁に発生させて
離脱させる脱塵装置が使用されている。2. Description of the Related Art Dust trapped by a filter is released by injecting a backwash gas into the space on the clean gas side of the filter to generate a differential pressure on the filter wall in the direction opposite to that when filtering the dust-containing gas and separating it. Dust equipment is used.
【０００３】逆洗ガスには、窒素などの非酸化性ガスの
圧縮ガス、圧縮空気、フィルタで濾過された被処理ガ
ス、これらの混合ガス等が使用される。また、圧縮ガス
を逆洗ガスに使用する場合、使用する圧縮空気の量が少
なくても済むように、また低い温度の逆洗ガスがフィル
タに当たってフィルタに大きな熱衝撃を与えないよう
に、逆洗ノズルから噴出させるガス流のエゼクタ効果を
利用し、フィルタで濾過された被処理ガスをガス流に取
り込んで逆洗ノズルから噴出したガスと被処理ガスが混
合したガスを逆洗ガスに利用している（特公平２−２２
６８９）。As the backwash gas, a compressed gas of a non-oxidizing gas such as nitrogen, compressed air, a gas to be treated which has been filtered by a filter, or a mixed gas thereof is used. Also, when using compressed gas as backwash gas, backwash should be done so that a small amount of compressed air is used and that the low temperature backwash gas does not hit the filter and cause a large thermal shock to the filter. Utilizing the ejector effect of the gas flow ejected from the nozzle, the gas to be treated filtered by the filter is taken into the gas flow, and the gas ejected from the backwash nozzle and the gas to be treated are used as the backwash gas. Yes (Tokuhei 2-22
689).
【０００４】脱塵装置で脱塵される高温の含塵ガスは、
たとえば重油や石炭の燃焼ガスである場合、多量の水蒸
気とともに硫黄酸化物、窒素酸化物などの腐食性物質を
含んでいる。このため、高温の被処理ガスが冷却されて
被処理ガス中の水蒸気が凝縮すると、腐食性物質が水滴
中に溶け込んで腐食性の水溶液からなる水滴が生成す
る。この腐食性の水滴が、逆洗装置に付属する被処理ガ
スを流す配管のシール部や配管に取り付けられた逆洗弁
を構成する金属材料の表面に付着すると腐食が起きる。The hot dust-containing gas dedusted by the dedusting device is
For example, combustion gas of heavy oil or coal contains corrosive substances such as sulfur oxide and nitrogen oxide together with a large amount of steam. For this reason, when the high-temperature gas to be processed is cooled and the water vapor in the gas to be processed is condensed, the corrosive substance is dissolved in the water drops to form water droplets composed of a corrosive aqueous solution. Corrosion occurs when the corrosive water droplets adhere to the surface of the metal material that constitutes the backwash valve attached to the seal portion of the pipe for flowing the gas to be processed attached to the backwash device.
【０００５】高温の含塵ガス中の塵を捕集する脱塵装置
に設けられた逆洗装置では、高温の水蒸気を含む被処理
ガスが低温の逆洗ガスで冷却された配管や逆洗装置の逆
洗弁と接触することになり、冷却されると水蒸気の凝縮
が起きて腐食性の水溶液からなる水滴が生成する。特
に、逆洗装置に付属する配管のシール部や逆洗弁の部分
で腐食が起きると、シール部からガスが漏れたり、逆洗
弁が錆び付いて逆洗装置が正常に作動しなくなる。In the backwashing device provided in the dust removing device for collecting dust in the hot dust-containing gas, the pipe or the backwashing device in which the gas to be treated containing the high-temperature steam is cooled by the low-temperature backwashing gas When it is cooled, water vapor condenses and water droplets consisting of a corrosive aqueous solution are generated. In particular, when corrosion occurs in the seal portion of the pipe attached to the backwash device or the backwash valve portion, gas leaks from the seal portion or the backwash valve becomes rusted and the backwash device does not operate normally.
【０００６】また、石炭ガス化炉から送り出される合成
ガス中の塵を脱塵する場合には、合成ガス中に含まれる
水蒸気濃度は低いが、冷えた機器の表面に合成ガスが到
達すると、合成ガス中含まれる硫黄化合物等（たとえば
Ｈ2 Ｓ）から硫黄（α−Ｓ、凝固温度４４４．７℃、凝
固温度１１２．８℃）等が析出し、電磁弁等に付着して
正常に作動しなくなるトラブルが起きている。これらの
問題を解決する一手段として、逆洗ガスを常時流してパ
ージする方法（特開平７−４７２１４）や、結露や固体
が析出しやすい箇所にヒータを取り付けてこれらを防ぐ
方法がある。Further, when dedusting the dust in the synthesis gas sent out from the coal gasification furnace, the concentration of water vapor contained in the synthesis gas is low, but when the synthesis gas reaches the surface of a cold equipment, the synthesis gas is synthesized. Sulfur (α-S, solidification temperature 444.7 ° C, solidification temperature 112.8 ° C) and the like are deposited from the sulfur compound and the like (for example, H 2 S) contained in the gas and adhere to the solenoid valve etc. to operate normally. There is a problem that disappears. As one means for solving these problems, there is a method of constantly flowing a backwash gas for purging (Japanese Patent Laid-Open No. 7-47214), and a method of attaching a heater to a place where dew condensation or solids are likely to be deposited to prevent them.
【０００７】しかし、逆洗ガスを常時流してパージする
方法では逆洗ガスを流すのに必要な運転コストが嵩み、
温度の高い被処理ガスに低温の逆洗ガスが多く混合する
と被処理ガスの有する有効エネルギーが減少するので好
ましくない。また、腐食等が起きやすい部分にヒータを
取り付けて結露等を防ぐ方法では、設備費とメインテナ
ンスの費用が増え、さらにヒータで消費するエネルギー
費が嵩むことになるので好ましくない。[0007] However, in the method in which the backwash gas is constantly flowed and purged, the operating cost required to flow the backwash gas increases,
Mixing a large amount of low-temperature backwash gas with the high-temperature gas to be processed is not preferable because the effective energy of the gas to be processed decreases. Further, a method of attaching a heater to a portion where corrosion or the like is likely to occur to prevent dew condensation and the like is not preferable because equipment cost and maintenance cost increase, and energy cost consumed by the heater increases.
【０００８】[0008]
【発明が解決しようとする課題】逆洗装置の逆洗弁にト
ラブルが起きて正常に作動しないと、正常な逆洗が行わ
れなくなってフィルタに捕捉した塵がフィルタから完全
に離脱せず、フィルタの濾過差圧が増大して脱塵装置の
処理容量が減少する。このような場合、発電設備等の大
きなプラント全体を停止して脱塵装置を修理することが
必要になる。本発明の目的は、設備費とランニングコス
トが嵩まない、これら腐食等の問題を解消した信頼性の
高い脱塵装置を提供することにある。If trouble occurs in the backwash valve of the backwash device and it does not operate normally, normal backwash will not be performed and the dust trapped in the filter will not completely separate from the filter. The filtration differential pressure of the filter increases and the processing capacity of the dust removing device decreases. In such a case, it is necessary to stop the entire large plant such as power generation equipment and repair the dust removing device. An object of the present invention is to provide a highly reliable dust removing device which eliminates the problems of corrosion and the like without increasing the facility cost and running cost.
【０００９】[0009]
【課題を解決するための手段】本発明の脱塵装置は、フ
ィルタによって高温含塵ガス中の塵を捕捉し、逆洗ガス
を逆流させてフィルタを再生する逆洗装置を備えた脱塵
装置において、脱塵装置の容器本体と逆洗装置に設けた
逆洗弁との間を連結する配管に屈曲部が設けられ、当該
配管の内部で低温の逆洗ガスと高温の被処理ガスがその
密度差によって相互に置換されるときに、上記逆洗弁に
被処理ガスが到達しないようにされていることを特徴と
する。DISCLOSURE OF THE INVENTION The dedusting device of the present invention is equipped with a backwashing device which captures dust in high-temperature dust-containing gas by a filter and causes the backwashing gas to flow back to regenerate the filter. In the above, a bent portion is provided in the pipe connecting the container body of the dust removing device and the backwash valve provided in the backwash device, and the low-temperature backwash gas and the high-temperature gas to be treated are provided inside the pipe. It is characterized in that the gas to be treated does not reach the backwash valve when they are mutually replaced by the density difference.
【００１０】高温の含塵ガス中の塵を捕集する脱塵装置
に設けられた逆洗装置の配管の内部は、逆洗が行われた
直後には注入した空気等の逆洗ガスで充たされている。
この逆洗ガスの温度は、脱塵装置の容器本体から配管に
流入する被処理ガスの温度より低いので、被処理ガスよ
り密度が大きく重い。このため、逆洗後に熱い被処理ガ
スが配管内に流入すると、冷たくて重い逆洗ガスが被処
理ガスの下方にもぐり込み、逆洗ガスと被処理ガスが相
互に置換される。水蒸気を多く含む被処理ガスが逆洗装
置の逆洗弁に到達すると、そこで被処理ガスが冷却され
て被処理ガス中の水蒸気が凝縮し、水滴となる。The inside of the pipe of the backwashing device provided in the dust removing device for collecting dust in the hot dust-containing gas is filled with backwashing gas such as injected air immediately after backwashing. Is being played.
Since the temperature of the backwash gas is lower than the temperature of the gas to be treated flowing into the pipe from the container body of the dust removing device, it has a higher density and heavier than the gas to be treated. Therefore, when the hot gas to be processed flows into the pipe after the backwashing, the cold and heavy backwashing gas rushes under the gas to be treated, and the backwashing gas and the gas to be treated are mutually replaced. When the target gas containing a large amount of steam reaches the backwash valve of the backwash device, the target gas is cooled there, and the steam in the target gas is condensed to form water droplets.
【００１１】この凝縮した水滴に被処理ガス中にあるＳ
ＯX やＮＯX 等の腐食性物質が溶け込むと、腐食性の水
滴となり、この水滴が付着した部分が腐食される。本発
明の脱塵装置では、脱塵装置の容器本体と逆洗装置に設
けた逆洗弁との間を連結する配管に屈曲部が設けられて
おり、当該配管の内部で低温の逆洗ガスと高温の被処理
ガスがその密度差によって相互に置換されるときに、逆
洗弁が被処理ガスの到達しない箇所に取り付けられてい
るので、逆洗弁とその近傍に腐食性の水滴が付着して逆
洗弁やその付近の機材の表面が腐食するのを避けられ
る。The condensed water droplets contain S in the gas to be treated.
When O X and NO corrosive substances such as X dissolves becomes a corrosive water droplets, the portion where the water droplets adhering is corroded. In the dust remover of the present invention, a bent portion is provided in a pipe connecting between the container body of the dust remover and the backwash valve provided in the backwash device, and a low-temperature backwash gas is provided inside the pipe. Since the backwash valve is installed at a location where the gas to be treated does not reach when the high-temperature and high-temperature to-be-treated gases are replaced by each other due to the density difference, corrosive water droplets adhere to the backwash valve and its vicinity Therefore, it is possible to avoid corroding the surface of the backwash valve and the equipment around it.
【００１２】本発明では、配管に屈曲部が設けられてい
るため、配管の少なくとも一部に上下方向の高低差があ
り、この高低差の部分が密度の大きいガスで充たされる
と密度の小さいガスの流入が阻止される。In the present invention, since the pipe is provided with the bent portion, there is a vertical height difference in at least a part of the pipe, and when the height difference portion is filled with a gas having a high density, a gas having a low density is obtained. Is prevented from flowing.
【００１３】本発明の好ましい脱塵装置では、逆洗装置
が逆洗ガスを噴出する逆洗ノズルを備えており、逆洗ノ
ズルから逆洗弁に連結される部分の配管が下方に屈曲さ
れ、逆洗弁が逆洗ノズル位置より低い箇所に引いた配管
に取り付けられている。この場合、逆洗弁が取り付けら
れた低い位置の配管には温度が低く密度が大きい逆洗ガ
スが滞留し、そこへ被処理ガスが流入しないので、逆洗
弁とその近傍に水蒸気が凝縮したり、固体が析出するの
を避けられる。In a preferred dust removing apparatus of the present invention, the backwashing device is equipped with a backwashing nozzle for ejecting a backwashing gas, and a pipe of a portion connected from the backwashing nozzle to the backwash valve is bent downward, A backwash valve is attached to the pipe drawn below the backwash nozzle. In this case, the backwash gas with a low temperature and a high density stays in the pipe at the lower position where the backwash valve is attached, and the gas to be treated does not flow into it, so that water vapor condenses in the backwash valve and its vicinity. It is also possible to avoid the precipitation of solids.
【００１４】本発明の他の好ましい脱塵装置では、逆洗
装置が逆洗ガスを噴出する逆洗ノズ備えており、逆洗ノ
ズルから逆洗弁に連結される部分の配管が一旦逆洗ノズ
ルの位置より上方に屈曲され、さらに配管が下方に屈曲
された箇所に逆洗弁が取り付けられている。この場合に
も、逆洗弁が取り付けられた部分の配管には低温の重い
逆洗ガスが停滞して被処理ガスが流入しないので、逆洗
弁が錆びて故障する等のトラブルを避けられる。In another preferred dust removing apparatus of the present invention, the backwashing device is provided with a backwashing nozzle for ejecting the backwashing gas, and the pipe connected to the backwashing valve from the backwashing nozzle is once backwashed. The backwash valve is attached to a position where the pipe is bent upward from the position and the pipe is bent downward. Also in this case, since the low-temperature heavy backwash gas stagnates and the gas to be treated does not flow into the pipe where the backwash valve is attached, troubles such as rust and failure of the backwash valve can be avoided.
【００１５】本発明の他の好ましい脱塵装置では、逆洗
ガスが圧縮空気とされ、逆洗装置がエゼクタ効果を利用
してフィルタで濾過された被処理ガスを逆洗ガスに取り
込むものであり、高温含塵ガスが燃焼ガスである。In another preferred dedusting device of the present invention, the backwash gas is compressed air, and the backwash device takes in the gas to be treated filtered by the filter into the backwash gas by utilizing the ejector effect. The high temperature dust-containing gas is the combustion gas.
【００１６】被処理ガスが燃焼ガスである場合には、被
処理ガスが高濃度の水蒸気を含んでおり、被処理ガスが
冷やされると腐食性の水滴が生成しやすい。圧縮空気
は、空気が圧縮されるときにかなりの量の水分が絞り出
されて除かれるので、減圧された状態では比較的乾燥し
た空気になる。したがって、圧縮空気の使用は本発明の
脱塵装置に好適であり、被処理ガスが高濃度に水蒸気を
含む燃焼ガスであっても水滴の凝縮による逆洗弁等の腐
食を確実に回避できる。また、逆洗装置がエゼクタ効果
を利用して被処理ガスを逆洗ガスに取り込むものであれ
ば、逆洗に使用する圧縮空気の消費量を顕著に節減で
き、脱塵装置の実用性を高めうる。When the gas to be treated is a combustion gas, the gas to be treated contains a high concentration of water vapor, and corrosive water droplets are easily generated when the gas to be treated is cooled. Compressed air is relatively dry in the depressurized state because a significant amount of water is squeezed out and removed as the air is compressed. Therefore, the use of compressed air is suitable for the dust remover of the present invention, and even if the gas to be treated is a combustion gas containing a high concentration of water vapor, it is possible to reliably avoid corrosion such as a backwash valve due to condensation of water droplets. In addition, if the backwash device takes in the gas to be treated into the backwash gas by utilizing the ejector effect, the consumption of compressed air used for the backwash can be significantly reduced, and the practicality of the dust remover can be improved. sell.
【００１７】本発明の他の好ましい脱塵装置では、脱塵
装置が、石炭を燃料とする加圧流動床ボイラの燃焼ガス
中の塵の捕集に使用されるものである。加圧流動床ボイ
ラによる発電プラントは、石炭エネルギを効率良く利用
でき、排出される燃焼ガス中に含まれる硫黄化合物や窒
素酸化物の量が顕著に少ないことで次世代の石炭利用技
術として注目されている。脱塵装置の信頼性を高められ
ればこの次世代の技術の実用化を早めることができる。
この場合の高温含塵ガスの温度は８００℃を超える。ま
た、石炭ガス化炉から送り出される合成ガスの温度は通
常５００℃程度であり、この場合の逆洗ガスには窒素ガ
スが使用される。In another preferred dust remover of the invention, the dust remover is used to collect dust in the combustion gas of a coal-fueled pressurized fluidized bed boiler. A power plant using a pressurized fluidized bed boiler is able to efficiently use coal energy, and the amount of sulfur compounds and nitrogen oxides contained in exhausted combustion gas is remarkably small, so it has attracted attention as a next-generation coal utilization technology. ing. If the reliability of the dust remover can be improved, the practical application of this next-generation technology can be accelerated.
In this case, the temperature of the hot dust-containing gas exceeds 800 ° C. Further, the temperature of the synthesis gas sent out from the coal gasification furnace is usually about 500 ° C., and nitrogen gas is used as the backwash gas in this case.
【００１８】[0018]
【実施例】以下、実施例によって本発明を具体的に説明
するが、本発明はこれらの実施例によってなんら限定さ
れない。図２は、石炭を燃料とする加圧流動床ボイラ
（図示せず）の燃焼ガスの配管に接続された従来の脱塵
装置の概要を示す断面図である。この例で脱塵装置に導
入される高温含塵ガスは温度が８５０℃、圧力が１０ｋ
ｇｆ／ｃｍ2 で、水蒸気を１０〜２０重量％、ＳＯX を
１００ｐｐｍ、ＮＯXを１００ｐｐｍ含み、露点は約１
８０℃である。図２において、１はフィルタ管、２は脱
塵装置の容器本体、３はディフューザ、４は逆洗ノズ
ル、５は配管、６は逆洗弁、７は逆洗ノズル配管、８は
圧縮空気配管、９は清浄ガス側空間、１０は被処理ガス
の出口、１１は含塵ガス入口、１２は捕集した塵の取り
出し口である。この脱塵装置の逆洗装置は３〜８の部分
からなる。EXAMPLES The present invention will be described in detail below with reference to examples, but the present invention is not limited to these examples. FIG. 2 is a cross-sectional view showing an outline of a conventional dust removing device connected to a combustion gas pipe of a pressurized fluidized bed boiler (not shown) that uses coal as a fuel. In this example, the high temperature dust-containing gas introduced into the dust remover has a temperature of 850 ° C. and a pressure of 10 k.
gf / cm 2 , 10 to 20% by weight of water vapor, 100 ppm of SO X , 100 ppm of NO X , dew point of about 1
80 ° C. In FIG. 2, 1 is a filter tube, 2 is a container body of a dust removing device, 3 is a diffuser, 4 is a backwash nozzle, 5 is piping, 6 is a backwash valve, 7 is a backwash nozzle piping, and 8 is compressed air piping. 9 is a space on the clean gas side, 10 is an outlet for the gas to be treated, 11 is an inlet for the dust-containing gas, and 12 is an outlet for collecting the collected dust. The backwashing device of this dust removing device consists of 3-8 parts.
【００１９】この脱塵装置では、逆洗操作が完了すると
濾過された被処理ガスが配管５に流入する。配管５に被
処理ガスが流入すると、被処理ガスはガス拡散でなく、
ガスの密度差によって逆洗ガスとの間で置換が速やかに
起きる。In this dust removing apparatus, when the backwashing operation is completed, the filtered gas to be treated flows into the pipe 5. When the gas to be processed flows into the pipe 5, the gas to be processed is not gas diffusion,
Due to the difference in gas density, replacement with the backwash gas occurs quickly.
【００２０】つまり、被処理ガスは空気等の逆洗ガスと
置換して逆洗ガスで充たされている逆洗ノズル４と逆洗
ノズル配管７に流入し、逆洗弁６に到達する。すると温
度の低い逆洗弁６等が被処理ガスと接する部分に腐食性
物質を含む水滴が付着し、逆洗弁６が取り付けられてい
るシール部や逆洗弁６の表面で腐食が進行する。この腐
食の進行は、逆洗間隔９〜２０分で１０００時間の運転
を行った図２に示された構成の脱塵装置に設けられた逆
洗装置の逆洗弁６（ＳＵＳ３１６製）の表面において観
察された。That is, the gas to be treated is replaced with a backwash gas such as air and flows into the backwash nozzle 4 and the backwash nozzle pipe 7 filled with the backwash gas, and reaches the backwash valve 6. Then, water droplets containing a corrosive substance adhere to a portion of the backwash valve 6 having a low temperature in contact with the gas to be treated, and corrosion progresses at the seal portion where the backwash valve 6 is attached and the surface of the backwash valve 6. . The progress of this corrosion is due to the surface of the backwash valve 6 (made of SUS316) of the backwash device provided in the dust remover having the configuration shown in FIG. 2 which was operated for 1000 hours at the backwash interval of 9 to 20 minutes. Was observed in.
【００２１】図１は図２と同じ加圧流動床ボイラの燃焼
ガスの配管に接続された、本発明の脱塵装置の一例の概
要を示す断面図である。図１には、図２に記載したのと
同じ名称の部分に同じ符号を付してある（後述の図３、
図４についても同じ）。図１の実施例では、逆洗ノズル
４から逆洗弁６に連結された逆洗ノズル配管７が下方に
屈曲され、逆洗弁５が逆洗ノズル４より約０．５ｍ低い
箇所に引いた配管７に取り付けられている。FIG. 1 is a sectional view showing an outline of an example of the dust removing device of the present invention connected to the combustion gas pipe of the same pressurized fluidized bed boiler as in FIG. In FIG. 1, parts having the same names as those described in FIG. 2 are denoted by the same reference numerals (see FIG.
The same applies to FIG. 4.) In the embodiment of FIG. 1, the backwash nozzle pipe 7 connected from the backwash nozzle 4 to the backwash valve 6 is bent downward, and the backwash valve 5 is pulled to a position about 0.5 m lower than the backwash nozzle 4. It is attached to the pipe 7.
【００２２】この例では逆洗弁６を閉じた逆洗操作の直
後、逆洗ノズル４と逆洗ノズル配管７内は温度が低い逆
洗ガスで充たされている。逆洗ガスである温度の低い空
気は脱塵装置の容器本体から送り出される温度が高い被
処理ガスより重いので、被処理ガスは逆洗ノズル配管７
の中途までしか流入できず、逆洗弁６とその近傍には到
達しない。したがって、逆洗弁６とその近傍に腐食性の
水滴が付着するのを避けられる。この構成の脱塵装置を
逆洗周期９〜２０分で合計１０００時間運転したが、使
用したＳＵＳ３１６製の逆洗弁６には腐食の形跡が認め
られなかった。In this example, immediately after the backwash operation with the backwash valve 6 closed, the backwash nozzle 4 and the backwash nozzle pipe 7 are filled with backwash gas having a low temperature. Since the air having a low temperature, which is the backwash gas, is heavier than the gas to be treated having a high temperature sent out from the container body of the dust removing device, the gas to be treated is the backwash nozzle pipe 7
The inflow can be made only halfway and does not reach the backwash valve 6 and its vicinity. Therefore, it is possible to prevent the corrosive water droplets from adhering to the backwash valve 6 and its vicinity. The dedusting device having this configuration was operated for a total of 1000 hours with a backwash cycle of 9 to 20 minutes, but no trace of corrosion was found on the backwash valve 6 made of SUS316 used.
【００２３】図３は、本発明の脱塵装置の他の一例の概
要を示す断面図である。この例では逆洗弁６の取り付け
箇所が逆洗ノズル４と同じ高さにあるが、逆洗ノズル配
管７が下方に屈曲しており、この下方に屈曲した配管部
分が温度が低くて重い逆洗ガスで充たされ、この部分に
被処理ガスが流入しない。したがって、逆洗弁６とその
近傍には被処理ガスが到達せず、逆洗弁６とその近傍に
腐食性の水滴が凝縮するのを避けられる。FIG. 3 is a sectional view showing the outline of another example of the dust removing apparatus of the present invention. In this example, the backwash valve 6 is installed at the same height as the backwash nozzle 4, but the backwash nozzle pipe 7 is bent downward, and the pipe portion bent downward has a low temperature and is heavy. It is filled with cleaning gas, and the gas to be treated does not flow into this portion. Therefore, the gas to be treated does not reach the backwash valve 6 and its vicinity, and it is possible to prevent corrosive water droplets from condensing on the backwash valve 6 and its vicinity.
【００２４】図４は、本発明の脱塵装置の他の一例の概
要を示す断面図である。この例では逆洗ノズルから逆洗
弁に連結された逆洗ノズル配管７が一旦逆洗ノズルより
上方に屈曲され、さらに配管７が下方に屈曲された箇所
（右端）に逆洗弁６が取り付けられている。この構成に
よって、この場合も、温度が低くて重い逆洗ガスが、逆
洗弁６を取り付けた配管７の下方に屈曲された部分を充
たしていて被処理ガスと置換しない。したがって、被処
理ガスが逆洗弁６の近傍に流入せず、逆洗弁６とその近
傍に腐食性の水滴が凝縮するのを避けられる。FIG. 4 is a sectional view showing the outline of another example of the dust removing apparatus of the present invention. In this example, the backwash nozzle pipe 7 connected to the backwash valve from the backwash nozzle is once bent upward from the backwash nozzle, and the backwash valve 6 is attached to a portion (right end) where the pipe 7 is bent downward. Has been. With this configuration, also in this case, the backwash gas having a low temperature and heavy does not replace the gas to be treated by filling the bent portion below the pipe 7 to which the backwash valve 6 is attached. Therefore, the gas to be treated does not flow into the vicinity of the backwash valve 6, and it is possible to prevent the corrosive water droplets from condensing on the backwash valve 6 and its vicinity.
【００２５】[0025]
【発明の効果】本発明の脱塵装置では、脱塵装置の容器
本体と逆洗装置に設けた逆洗弁との間を連結する配管の
内部で低温の逆洗ガスと高温の被処理ガスがその密度差
によって相互に置換されることがあっても、逆洗弁に至
る配管が屈曲されており、逆洗弁が、逆洗ガスが滞留し
ていて被処理ガスが到達しない箇所に取り付けられてい
る。このため、腐食性物質を含む水滴が逆洗弁やその近
傍に付着して逆洗弁が腐食したり、シール部が損傷する
ことがなく、逆洗弁の弁に固体が析出して弁の開閉が妨
げられるのを回避できる。その結果、ほとんどコスト増
を伴わないで逆洗装置の耐用を顕著に延長でき、信頼性
の高い脱塵装置を提供できる。According to the dedusting device of the present invention, a low-temperature backwash gas and a high-temperature gas to be treated are provided inside the pipe connecting the container body of the dedusting device and the backwash valve provided in the backwash device. Even if they are replaced by each other due to the difference in density, the pipe leading to the backwash valve is bent, and the backwash valve is installed at a location where the backwash gas remains and the gas to be treated does not reach. Has been. For this reason, water droplets containing corrosive substances will not adhere to the backwash valve and its vicinity to corrode the backwash valve, and the seal will not be damaged. It is possible to avoid obstruction of opening and closing. As a result, the service life of the backwash device can be remarkably extended with almost no increase in cost, and a highly reliable dust removing device can be provided.
【図１】本発明の脱塵装置の一例の概要を示す断面図FIG. 1 is a cross-sectional view showing an outline of an example of a dust remover of the present invention.
【図２】従来の脱塵装置の概要を示す断面図FIG. 2 is a sectional view showing an outline of a conventional dust removing device.
【図３】本発明の脱塵装置の他の一例の概要を示す断面
図FIG. 3 is a sectional view showing the outline of another example of the dust remover of the present invention.
【図４】本発明の脱塵装置の他の一例の概要を示す断面
図FIG. 4 is a cross-sectional view showing the outline of another example of the dust remover of the present invention.
１：フィルタ管 ２：脱塵装置の容器本体 ３：ディフューザ ４：逆洗ノズル ５：配管 ６：逆洗弁 ７：逆洗ノズル配管 ８：圧縮ガス（圧縮空気）配管 ９：清浄ガス側空間 １０：被処理ガスの出口 １１：含塵ガス入口 １２：捕集した塵の取り出し口 1: Filter pipe 2: Dust removal device container body 3: Diffuser 4: Backwash nozzle 5: Piping 6: Backwash valve 7: Backwash nozzle pipe 8: Compressed gas (compressed air) pipe 9: Clean gas side space 10 : Outlet of gas to be treated 11: Inlet of gas containing dust 12: Outlet of collected dust
Claims (5)
捉し、逆洗ガスを逆流させてフィルタを再生する逆洗装
置を備えた脱塵装置において、脱塵装置の容器本体と逆
洗装置に設けた逆洗弁との間を連結する配管に屈曲部が
設けられ、当該配管の内部で低温の逆洗ガスと高温の被
処理ガスがその密度差によって相互に置換されるとき
に、上記逆洗弁に被処理ガスが到達しないようにされて
いることを特徴とする脱塵装置。1. A dedusting device equipped with a backwashing device for trapping dust in a high-temperature dust-containing gas by a filter and recirculating the backwashing gas to regenerate the filter. The container body of the dedusting device and the backwashing device. The bent portion is provided in the pipe connecting between the backwash valve and the backwash valve, and when the low-temperature backwash gas and the high-temperature gas to be treated are mutually replaced by the density difference inside the pipe, A dust remover characterized in that the gas to be treated does not reach the backwash valve.
を備えており、逆洗ノズルから逆洗弁に連結される部分
の配管が下方に屈曲され、逆洗弁が逆洗ノズルの位置よ
り低い箇所に取り付けられている請求項１記載の脱塵装
置。2. A backwashing device is provided with a backwashing nozzle for ejecting a backwashing gas, a pipe of a portion connected from the backwashing nozzle to the backwash valve is bent downward, and the backwash valve is a backwash nozzle. The dust remover according to claim 1, which is attached at a position lower than the position.
を備えており、逆洗ノズルから逆洗弁に連結される配管
が一旦逆洗ノズルより上方に屈曲され、さらに下方に屈
曲された箇所に逆洗弁が取り付けられている請求項１記
載の脱塵装置。3. A backwashing device is provided with a backwashing nozzle for ejecting a backwashing gas, and a pipe connected from the backwashing nozzle to the backwash valve is bent once above the backwash nozzle and further bent downward. The dedusting device according to claim 1, wherein a backwash valve is attached to the removed portion.
ゼクタ効果を利用してフィルタで濾過された被処理ガス
を逆洗ガスに取り込むものであり、高温含塵ガスが燃焼
ガスである請求項１〜３のいずれか記載の脱塵装置。4. The backwash gas is compressed air, and the backwash device takes in the gas to be treated, which has been filtered by a filter using the ejector effect, into the backwash gas, and the high temperature dust-containing gas is the combustion gas. The dust remover according to any one of claims 1 to 3.
ボイラの燃焼ガス中の塵の捕集に使用されるものである
請求項１〜４のいずれか記載の脱塵装置。5. The dust remover according to claim 1, wherein the dust remover is used for collecting dust in combustion gas of a pressurized fluidized bed boiler using coal as a fuel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7265918A JPH09103626A (en) | 1995-10-13 | 1995-10-13 | Dust removing apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7265918A JPH09103626A (en) | 1995-10-13 | 1995-10-13 | Dust removing apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09103626A true JPH09103626A (en) | 1997-04-22 |
Family
ID=17423910
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7265918A Pending JPH09103626A (en) | 1995-10-13 | 1995-10-13 | Dust removing apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09103626A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106885078A (en) * | 2017-02-23 | 2017-06-23 | 林文喜 | A kind of high-temperature gas is by using pipeline and supporting dust arrester |
| KR20220019479A (en) * | 2020-08-10 | 2022-02-17 | 주식회사 포스코 | Foreign material removal device for air filter of blower |
-
1995
- 1995-10-13 JP JP7265918A patent/JPH09103626A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106885078A (en) * | 2017-02-23 | 2017-06-23 | 林文喜 | A kind of high-temperature gas is by using pipeline and supporting dust arrester |
| KR20220019479A (en) * | 2020-08-10 | 2022-02-17 | 주식회사 포스코 | Foreign material removal device for air filter of blower |
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