JP2003118792A - Storing method for flying ash - Google Patents
Storing method for flying ashInfo
- Publication number
- JP2003118792A JP2003118792A JP2001315102A JP2001315102A JP2003118792A JP 2003118792 A JP2003118792 A JP 2003118792A JP 2001315102 A JP2001315102 A JP 2001315102A JP 2001315102 A JP2001315102 A JP 2001315102A JP 2003118792 A JP2003118792 A JP 2003118792A
- Authority
- JP
- Japan
- Prior art keywords
- storage tank
- fly ash
- flying ash
- dry air
- ash
- 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
Abstract
Description
【発明の詳細な説明】
【０００１】
【発明の属する技術分野】本発明は、潮解性を有する成
分を含有する都市ごみ焼却飛灰を安定化装置に供給する
前段階で所定期間貯留槽にブリッジ（棚吊り）現象を生
じさせることなく貯留しておく貯留方法に関する。
【０００２】
【従来の技術及び発明が解決しようとする課題】従来、
都市ごみ焼却過程により発生する集塵ダスト、ボイラー
灰及びガス冷灰等（以下飛灰と云う）は円筒又は角型貯
槽の下部を円錐又は角錐とした貯槽に貯留し、貯留槽下
部にエアレーション或いはバイブレーター等を配し、エ
アースライダー効果もしくは振動により、下部排出口よ
り供給機を通し次工程に排出していた。
【０００３】通常の飛灰は、塩化水素除去方式の違いに
よる湿式洗煙方式の中性のガス冷灰でも乾式アルカリ性
のガス冷灰（ボイラー灰は勿論のこと）でも、貯留槽下
部からの流動性に何ら問題なくスムーズに排出してい
た。
【０００４】近年、焼却炉の排ガス処理方法の変化によ
り、飛灰に若干の水分を含んだ飛灰や吸湿性の高い（潮
解性成分を含有）飛灰が発生し、貯留槽内又は供給機内
でブリッジ或いは機器への付着現象が生じるため、スム
ーズな排出が出来なくなっているケースが認められてい
る。特に、ごみ質により塩化水素濃度が極めて高い場
合、通常のモル比計算による消石灰の吹き込み量では、
発生する飛灰中の潮解性を示す成分量が多くなり、この
飛灰は室内に一晩放置しただけで約２０％の水分を吸湿
し、手で握ると塊状物の如き状態となることが確認され
ている。このような性状を示す飛灰は、通常の貯留槽で
の運転温度６０℃前後ではブリッジ等の異常現象が発生
するため、供給機への飛灰の供給がスムーズに行われ
ず、トラブルの大きな原因となっている。
【０００５】この場合、特開平１１−７６９９１号公報
に溶融または焼却飛灰の吸湿防止方法があり、これによ
ると粉体として扱える最大平衡水分量は３０％以下とし
ており、温度とＣｌ濃度及び平衡水分量との関係が図示
され、Ｃｌ＝２５％では温度が５５℃となっているが、
本飛灰のケースでは異なる現象を示している。
【０００６】また、搬送機では、飛灰の冷却のために搬
送機内のガスを排風機等により大量に排気するため、飛
灰を貯留槽に導入時に搬送機の出口と貯留槽の導入口と
を接合し飛灰の流路が外気と遮断されると、上記の排気
により搬送機と共に貯留槽内の圧力が大気圧未満となっ
てしまう。また、貯留槽内の温度が低下して、貯留槽内
の水分が凝縮したり、ガスが収縮したりすることによっ
ても貯留槽内圧力が低下する。貯留槽内圧力が低下する
と、貯留槽の開口部等から外気が流入するため、飛灰が
流入した空気中の水分を吸収し、飛灰の水分量が増加し
てしまう。
【０００７】本発明は、上記事情に鑑みなされたもの
で、上記ブリッジを引き起こすことなく、供給機を介し
て潮解性を有する成分を含有する都市ごみ焼却飛灰をス
ムーズに安定化装置に供給することができる焼却飛灰の
貯留方法を提供することを目的とする。
【０００８】
【課題を解決するための手段】本発明者は、上記目的を
達成するため鋭意検討を行った結果、貯留槽内に常時乾
燥空気を導入して、貯留槽内を乾燥状態に維持すること
により、貯留槽の開口部からの外気の流入が防止され、
これにより飛灰が貯留槽内でブリッジを引き起こさず、
スムーズに貯留装置から排出することを確認し、本発明
をなすに至ったものである。
【０００９】即ち、本発明は、搬送機から搬送されて貯
留槽内に導入され、この貯留槽に所定期間保留された吸
湿性を有する成分を含有する飛灰を排出するに際し、上
記飛灰を上記貯留槽内でブリッジが生じることを防止す
るための飛灰の貯留方法であって、貯留槽内に常時乾燥
空気を導入して、貯留槽内を乾燥状態に維持することを
特徴とする飛灰の貯留方法を提供する。
【００１０】
【発明の実施の形態及び実施例】図１は、本発明に用い
られる都市ごみ焼却飛灰の貯留装置の一例を示すもの
で、図中１は、下側が中空錐台状に形成され、上端面が
閉塞された筒状の貯留槽である。その天板１ａには、飛
灰導入口２が設けられており、都市ごみ焼却過程より発
生し、潮解性を有する成分、例えば塩化カルシウム等が
含有される飛灰（以下、潮解性飛灰という）が機械式、
エア圧送等により搬送機Ａで搬送されて、上記導入口２
から貯留槽１内に導入される。なお、図中３は飛灰であ
る。上記貯留槽１の下部（錐台部１ｂ）には、ヒーター
４が周方向に沿って飛灰３を均一に加熱するように配設
されている。また、貯留槽１の下部には、バイブレータ
ー５が配設され、このバイブレーター５の作動により飛
灰３が振動し、排出部１１内に落下、排出される。この
排出部１１は、有底筒状に形成され、上記貯留槽１の下
端部にこの貯留槽１底部の飛灰排出口６を開閉するゲー
ト７を介して連結されており、その底面には攪拌機１２
が取り付けられていると共に、該底面には、飛灰導出口
１３が形成され、排出部１１内に排出された飛灰３がこ
の導出口１３から飛灰を安定化装置（図示せず）に供給
するための供給機Ｂ（テーブルフィーダー、ロータリー
バルブ、スクリューコンベア等）に供給されるようにな
っている。
【００１１】上記貯留槽１の下部には、乾燥空気供給源
２１から供給された乾燥空気が、周方向に沿って複数個
配設されたエアレーション部材２２から潮解性飛灰３に
吹き込まれ、噴出される空気により飛灰３が攪拌できる
ようになっている。
【００１２】また、上記貯留槽１の天板１ａには、集塵
機３１が配設されている。この集塵機３１内には吸湿空
気を通過させると共に、飛灰３の粉塵を捕集し得る通気
性を有する濾布３２が配設されている。
【００１３】本発明においては、上記貯留槽への飛灰の
導入時及び貯留時に乾燥空気を非加熱状態で上述の乾燥
空気供給源から連続的に導入する。この方法によれば、
貯留槽内に乾燥空気を導入すること、特にこれにより貯
留装置内の圧力を大気圧以上に保つことで貯留装置内へ
の空気の流入を避けること、更に飛灰に付着する水分を
排出し乾燥状態をより高めることが可能であり、これに
より空気の流入による吸湿により貯留槽１内の潮解性飛
灰３がブリッジ（棚吊り）現象を起こすことなく、所定
期間貯留槽１内に乾燥状態で安定に保持され、これによ
り供給機Ｂにスムーズに飛灰３を排出、供給することが
できる。
【００１４】なお、上記エアレーション機構２２から
は、乾燥空気を貯留槽内が０〜０．０５ＭＰａＧ（ゲー
ジ圧）となるように供給されるようにすることが好まし
い。また、エアレーション機構２２から乾燥空気を貯留
槽内に供給すれば、搬送機Ａ内で大量の排気があるケー
スでも外部から流入した空気中の湿分は、乾燥空気に取
り込まれた形で集塵機３１から通過していくため、貯留
槽内は乾燥状態を維持することができる。
【００１５】
【発明の効果】本発明によれば、貯留槽内に乾燥空気を
吹き込むことにより、（１）貯留槽内の圧力を高め、外
気の流入による飛灰の水分の増加を避けることができ
る、（２）飛灰に含まれる水分及び外気に含まれる湿分
を乾燥空気に移行させて、貯留槽外に排出することがで
きる、（３）飛灰粒子間に乾燥空気が入り込み、飛灰の
流動性を高めることができるという効果が得られ、飛灰
をブリッジを生じさせることなくスムーズに排出するこ
とができる。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a municipal solid waste incineration fly ash containing a deliquescent component which is bridged to a storage tank for a predetermined period before being supplied to a stabilizing device. The present invention relates to a storage method for storing without causing a phenomenon. 2. Description of the Related Art
Dust collected from the municipal solid waste incineration process, boiler ash, gas-cooled ash, etc. (hereinafter referred to as fly ash) are stored in a cylindrical or rectangular storage tank with a conical or pyramid-shaped lower part, and aeration or lower part in the lower part of the storage tank. A vibrator or the like was provided, and was discharged to the next process through a feeder from a lower discharge port by an air slider effect or vibration. [0003] In general, fly ash flows from the lower part of the storage tank regardless of whether it is neutral gas-cooled ash or dry-alkaline gas-cooled ash (of course boiler ash) depending on the difference in the method of removing hydrogen chloride. It discharged smoothly without any problem in sex. [0004] In recent years, due to changes in the method of treating exhaust gas in incinerators, fly ash containing some water and fly ash having high hygroscopicity (containing deliquescent components) have been generated in fly ash, and have been produced in storage tanks or feeders. In some cases, a phenomenon of adhesion to a bridge or a device occurs, thereby preventing smooth discharge. In particular, when the hydrogen chloride concentration is extremely high due to the refuse, the amount of slaked lime blown by the usual molar ratio calculation,
The amount of deliquescent components in the generated fly ash increases, and this fly ash absorbs about 20% of moisture when left alone in a room overnight, and may become like a lump when grasped by hand. Has been confirmed. Fly ash exhibiting such properties causes abnormal phenomena such as bridges at an operating temperature of about 60 ° C. in a normal storage tank, so that fly ash is not smoothly supplied to the feeder, which is a major cause of trouble. It has become. In this case, Japanese Unexamined Patent Publication (Kokai) No. 11-76791 discloses a method for preventing moisture absorption of molten or incinerated fly ash. According to this method, the maximum equilibrium water content that can be treated as powder is 30% or less, and the temperature, Cl concentration and equilibrium The relationship with the water content is shown, and the temperature is 55 ° C. when Cl = 25%.
This fly ash case shows a different phenomenon. [0006] Further, in the transporter, a large amount of gas in the transporter is exhausted by an air blower or the like to cool the fly ash. Therefore, when the fly ash is introduced into the storage tank, an outlet of the transporter and an inlet of the storage tank are provided. When the fly ash flow path is cut off from the outside air, the pressure in the storage tank together with the carrier becomes lower than the atmospheric pressure due to the above-described exhaustion. Further, the temperature in the storage tank is reduced, and the water in the storage tank is condensed or the gas is contracted, so that the pressure in the storage tank is also reduced. When the pressure in the storage tank decreases, outside air flows in from the opening of the storage tank or the like, so that fly ash absorbs moisture in the inflowing air, and the water content of the fly ash increases. The present invention has been made in view of the above circumstances, and smoothly supplies municipal waste incineration fly ash containing a deliquescent component to a stabilizing device via a feeder without causing the bridge. It is an object of the present invention to provide a method for storing incinerated fly ash that can be used. Means for Solving the Problems As a result of intensive studies to achieve the above object, the present inventor has always introduced dry air into the storage tank to keep the inside of the storage tank dry. By doing so, the inflow of outside air from the opening of the storage tank is prevented,
This prevents fly ash from causing bridges in the storage tank,
It has been confirmed that the liquid is smoothly discharged from the storage device, and the present invention has been achieved. That is, according to the present invention, when discharging fly ash containing a component having a hygroscopic property, which is conveyed from a carrier and introduced into a storage tank, and is retained in the storage tank for a predetermined period, the fly ash is removed. A method for storing fly ash for preventing a bridge from occurring in the storage tank, wherein dry air is always introduced into the storage tank to keep the inside of the storage tank dry. A method for storing ash is provided. DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example of a municipal solid waste incineration fly ash storage device used in the present invention. It is a cylindrical storage tank whose upper end face is closed. The top plate 1a is provided with a fly ash inlet 2, which is generated from the municipal solid waste incineration process and contains a deliquescent component such as calcium chloride (hereinafter referred to as deliquescent fly ash). ) Is mechanical,
It is transported by the transporter A by air pressure feeding or the like, and
From the storage tank 1. In addition, 3 in the figure is fly ash. A heater 4 is disposed below the storage tank 1 (frustum portion 1b) so as to uniformly heat the fly ash 3 along the circumferential direction. Further, a vibrator 5 is disposed below the storage tank 1, and the fly ash 3 vibrates due to the operation of the vibrator 5, and falls and is discharged into the discharge unit 11. The discharge unit 11 is formed in a bottomed cylindrical shape, and is connected to the lower end of the storage tank 1 via a gate 7 that opens and closes a fly ash discharge port 6 at the bottom of the storage tank 1. Stirrer 12
The fly ash outlet 13 is formed on the bottom surface, and the fly ash 3 discharged into the discharge part 11 is used to stabilize the fly ash from the outlet 13 to a stabilizing device (not shown). The feeder B (table feeder, rotary valve, screw conveyor, etc.) for feeding is supplied. In the lower part of the storage tank 1, dry air supplied from a dry air supply source 21 is blown into the deliquescent fly ash 3 from a plurality of aeration members 22 arranged along the circumferential direction, and is ejected. The fly ash 3 can be agitated by the generated air. A dust collector 31 is provided on the top plate 1a of the storage tank 1. The dust collector 31 is provided with a filter cloth 32 that allows air to pass through and absorbs dust from the fly ash 3. In the present invention, when fly ash is introduced into and stored in the storage tank, dry air is continuously introduced from the above-mentioned dry air supply source in a non-heated state. According to this method,
Introducing dry air into the storage tank, especially by keeping the pressure inside the storage device above atmospheric pressure to avoid the inflow of air into the storage device, and further draining and drying the moisture attached to fly ash It is possible to further improve the state, and thus the deliquescent fly ash 3 in the storage tank 1 does not cause a bridge (shelf hanging) phenomenon due to moisture absorption due to the inflow of air, and the deashed fly ash 3 remains dry in the storage tank 1 for a predetermined period. The fly ash 3 can be discharged and supplied to the feeder B smoothly. It is preferable that dry air is supplied from the aeration mechanism 22 so that the pressure in the storage tank is 0 to 0.05 MPaG (gauge pressure). Further, if dry air is supplied from the aeration mechanism 22 into the storage tank, even in the case where a large amount of air is exhausted in the transporter A, the moisture in the air that has flowed in from the outside is collected in the dry air by the dust collector 31. , The inside of the storage tank can be maintained in a dry state. According to the present invention, by blowing dry air into the storage tank, it is possible to (1) increase the pressure in the storage tank and avoid an increase in the water content of fly ash due to the inflow of outside air. (2) Moisture contained in fly ash and moisture contained in outside air can be transferred to dry air and discharged out of the storage tank. (3) Dry air enters between fly ash particles and fly The effect that the fluidity of the ash can be enhanced is obtained, and the fly ash can be discharged smoothly without causing a bridge.
【図面の簡単な説明】
【図１】本発明に用いられる飛灰貯留装置の一実施例を
示す概略断面図である。
【符号の説明】
１ 貯留槽
２ 導入口
３ 飛灰
４ ヒーター
５ バイブレーター
６ 排出口
７ ゲート
１１ 排出部
１２ 攪拌機
１３ 導出口
２１ 乾燥空気供給装置
２２ エアレーション機構
３１ 集塵機
３２ 濾布BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic sectional view showing one embodiment of a fly ash storage device used in the present invention. [Description of Signs] 1 Storage tank 2 Inlet 3 Fly ash 4 Heater 5 Vibrator 6 Outlet 7 Gate 11 Outlet 12 Stirrer 13 Outlet 21 Dry air supply device 22 Aeration mechanism 31 Dust collector 32 Filter cloth
フロントページの続き Ｆターム(参考） 3E070 AA03 AB11 AB40 DA01 EA01 EB04 FA08 GA11 VA17 WG07 3K065 AA24 AC03 BA01 CA11 Continuation of front page F term (reference) 3E070 AA03 AB11 AB40 DA01 EA01 EB04 FA08 GA11 VA17 WG07 3K065 AA24 AC03 BA01 CA11
Claims (1)
れ、この貯留槽に所定期間保留された吸湿性を有する成
分を含有する飛灰を排出するに際し、上記飛灰を上記貯
留槽内でブリッジが生じることを防止するための飛灰の
貯留方法であって、貯留槽内に常時乾燥空気を導入し
て、貯留槽内を乾燥状態に維持することを特徴とする飛
灰の貯留方法。Claims 1. When discharging fly ash containing a component having a hygroscopic property, which is conveyed from a carrier and introduced into a storage tank, and is retained in the storage tank for a predetermined period, the fly ash is discharged. A method for storing fly ash for preventing ash from forming a bridge in the storage tank, wherein dry air is constantly introduced into the storage tank, and the inside of the storage tank is maintained in a dry state. How to store fly ash.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001315102A JP2003118792A (en) | 2001-10-12 | 2001-10-12 | Storing method for flying ash |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001315102A JP2003118792A (en) | 2001-10-12 | 2001-10-12 | Storing method for flying ash |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003118792A true JP2003118792A (en) | 2003-04-23 |
Family
ID=19133321
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001315102A Pending JP2003118792A (en) | 2001-10-12 | 2001-10-12 | Storing method for flying ash |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003118792A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006308269A (en) * | 2004-11-29 | 2006-11-09 | Mitsubishi Heavy Ind Ltd | Heat recovery equipment |
| CN102910666A (en) * | 2012-10-15 | 2013-02-06 | 蚌埠华东石膏有限公司 | Gypsum powder hopper machine with Vent hole |
| JP2015152235A (en) * | 2014-02-14 | 2015-08-24 | 株式会社Ihi | Fly ash treatment apparatus |
| JPWO2018101029A1 (en) * | 2016-12-02 | 2019-10-17 | 日立造船株式会社 | Exhaust gas treatment equipment and incineration equipment |
| WO2020199095A1 (en) * | 2019-04-01 | 2020-10-08 | 深圳市能源环保有限公司 | Electric heat tracing system of fly ash storage tank for domestic waste incineration |
-
2001
- 2001-10-12 JP JP2001315102A patent/JP2003118792A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006308269A (en) * | 2004-11-29 | 2006-11-09 | Mitsubishi Heavy Ind Ltd | Heat recovery equipment |
| CN102910666A (en) * | 2012-10-15 | 2013-02-06 | 蚌埠华东石膏有限公司 | Gypsum powder hopper machine with Vent hole |
| JP2015152235A (en) * | 2014-02-14 | 2015-08-24 | 株式会社Ihi | Fly ash treatment apparatus |
| JPWO2018101029A1 (en) * | 2016-12-02 | 2019-10-17 | 日立造船株式会社 | Exhaust gas treatment equipment and incineration equipment |
| JP2022031277A (en) * | 2016-12-02 | 2022-02-18 | 日立造船株式会社 | Exhaust gas processing device and incineration facility |
| JP7146049B2 (en) | 2016-12-02 | 2022-10-03 | 日立造船株式会社 | Exhaust gas treatment equipment and incineration equipment |
| WO2020199095A1 (en) * | 2019-04-01 | 2020-10-08 | 深圳市能源环保有限公司 | Electric heat tracing system of fly ash storage tank for domestic waste incineration |
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