JP2004150683A - Method and device for transporting refuse incineration fly ash - Google Patents

Method and device for transporting refuse incineration fly ash Download PDF

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Publication number
JP2004150683A
JP2004150683A JP2002315350A JP2002315350A JP2004150683A JP 2004150683 A JP2004150683 A JP 2004150683A JP 2002315350 A JP2002315350 A JP 2002315350A JP 2002315350 A JP2002315350 A JP 2002315350A JP 2004150683 A JP2004150683 A JP 2004150683A
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Japan
Prior art keywords
fly ash
bag filter
transporting
air
refuse incineration
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JP2002315350A
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Japanese (ja)
Inventor
Hiroshi Amano
宏 天野
Hideyoshi Adachi
秀義 安達
Tadahiro Uesugi
忠弘 植杉
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Ube Corp
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Ube Industries Ltd
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Priority to JP2002315350A priority Critical patent/JP2004150683A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and a device for transporting refuse incineration fly ash capable of preventing the fly ash from dispersing to the outside of the system, suppressing moisture absorption of the fly ash and blockage of a pipe, and transporting more safely the refuse incineration fly ash collected from exhaust gas containing refuse incineration fly ash generated from a refuse incineration plant. <P>SOLUTION: The problem of the invention is solved by the method and the device for transporting refuse incineration fly ash collected by lowering temperature of the exhaust gas containing refuse incineration fly ash generated from the refuse incineration plant and treating the gas with the hydrated lime, in which the refuse incineration fly ash is transferred to the pipe for transporting fly ash and heated dry air is supplied to a fly ash transferring part of the pipe by an aspirator while the refuse incineration fly ash is aspirated and transported into a fly ash silo through the pipe for transporting fly ash and a second bag filter. <P>COPYRIGHT: (C)2004,JPO

Description

【0001】
【発明の属する技術分野】
本発明は、ごみ焼却プラントから発生するごみ焼却飛灰含有排ガスより捕集されるごみ焼却飛灰、特にごみ焼却プラントから発生するごみ焼却飛灰含有排ガスを減温処理して捕集されるごみ焼却飛灰と該減温処理の排ガスを更に消石灰処理して捕集されるごみ焼却飛灰を系外に飛散させることなく輸送する技術に関する。
【0002】
【従来の技術】
ごみ焼却プラントから発生するごみ焼却飛灰含有排ガス(特に都市ごみを焼却炉で焼却する際に発生するごみ焼却飛灰含有排ガス)より捕集されるごみ焼却飛灰をサイロに輸送する際、従来方式では、ごみ焼却飛灰含有排ガスを減温処理や更に消石灰処理して捕集される飛灰をコンベヤにて輸送したり(非特許文献1)、ボイラ、エコノマイザ、及びサイクロン集塵器によって捕集される飛灰を、空気加熱器を介して押込みブロワより送給される加温乾燥空気(約90℃)にて空気輸送用配管を経て輸送していた(特許文献1)。しかし、コンベヤ輸送では、装置が複雑になってメンテナンスに手間がかかり、更にダイオキシン等の有害物質を含む飛灰がコンベヤから飛散するという問題があった。また、押込みブロワによる空気輸送では、輸送配管内が加圧状態となっているため、ロータリーバルブのシール部や配管の接続部等からの漏れ、磨耗や腐食等に起因する配管破損による噴出など、飛灰の飛散を完全に防止することは困難であり、更に、飛灰は水分を含んでいて粘性があるため、配管内へ付着して堆積成長し閉塞を起こす恐れがあった。
【0003】
【非特許文献1】
日本紛体工業技術協会編「流動層ハンドブック」培風館、1999年3月25日、p.376−385
【特許文献1】
特開平8−200646号公報(第1−3頁、第1−2図)
【0004】
【発明が解決しようとする課題】
そこで、本発明は、飛灰の系外への飛散を完全に防止し、更に飛灰の吸湿及び配管の閉塞も抑えて、ごみ焼却プラントから発生するごみ焼却飛灰含有排ガスより捕集されるごみ焼却飛灰(特にごみ焼却プラントの排ガスを減温処理して捕集されるごみ焼却飛灰と該減温処理の排ガスを更に消石灰処理して捕集されるごみ焼却飛灰)をより安全に輸送することができるごみ焼却飛灰の輸送方法及び輸送装置を提供することを目的とする。
【0005】
【課題を解決するための手段】
本発明は、ごみ焼却プラントから発生するごみ焼却飛灰含有排ガスを減温塔で減温処理して捕集されるごみ焼却飛灰(1)と該減温処理の排ガスを更に第1バグフィルタで消石灰処理して捕集されるごみ焼却飛灰(2)を輸送する方法において、ごみ焼却飛灰(1)を飛灰輸送用配管に移送すると共に、ごみ焼却飛灰(2)を飛灰輸送用配管のごみ焼却飛灰(1)の移送部の下流側に移送し、吸引装置により、空気加熱器を介して加熱乾燥空気を飛灰輸送用配管のごみ焼却飛灰(1)の移送部に取り入れながら、ごみ焼却飛灰(1)とごみ焼却飛灰(2)を該飛灰輸送用配管及び第2バグフィルタを経由して飛灰サイロに吸引輸送することを特徴とするごみ焼却飛灰の輸送方法にある。
【0006】
本発明は、また、ごみ焼却プラントから発生するごみ焼却飛灰含有排ガスを減温塔で減温処理して捕集されるごみ焼却飛灰(1)と該減温処理の排ガスを更に第1バグフィルタで消石灰処理して捕集されるごみ焼却飛灰(2)を輸送する装置において、空気加熱器と、ごみ焼却飛灰(1)を飛灰輸送用配管に移送する装置と、ごみ焼却飛灰(2)を飛灰輸送用配管のごみ焼却飛灰(1)の移送部の下流側に移送する装置と、第2バグフィルタと、飛灰サイロと、吸引装置を備え、吸引装置により、空気加熱器を介して加熱乾燥空気を飛灰輸送用配管のごみ焼却飛灰(1)の移送部に取り入れながら、ごみ焼却飛灰(1)とごみ焼却飛灰(2)を該飛灰輸送用配管及び第2バグフィルタを経由して飛灰サイロに吸引輸送するようにしたことを特徴とするごみ焼却飛灰の輸送装置にもある。
【0007】
次に、本発明の好ましい態様を列記する。
(1)空気加熱器において吸引装置により取り入れた空気を95〜150℃に加熱乾燥する上記のごみ焼却飛灰の輸送方法。
(2)飛灰輸送用配管を保温してごみ焼却飛灰を吸引輸送する上記のごみ焼却飛灰の輸送方法。
(3)消石灰処理の排ガスを空気加熱器に導いて吸引装置により取り入れた空気を加熱乾燥する上記のごみ焼却飛灰の輸送方法。
(4)第2バグフィルタと吸引装置の間に空気冷却器を設置して第2バグフィルタを通過した加熱乾燥空気を冷却する上記のごみ焼却飛灰の輸送方法。
(5)ごみ焼却飛灰を吸引輸送する飛灰輸送用配管に保温を施した上記のごみ焼却飛灰の輸送装置。
(6)消石灰処理の排ガスを空気加熱器に導いて吸引装置により取り入れた空気を加熱乾燥するようにした上記のごみ焼却飛灰の輸送装置。
(7)第2バグフィルタと吸引装置の間に空気冷却器を設置して第2バグフィルタを通過した加熱乾燥空気を冷却できるようにした上記のごみ焼却飛灰の輸送装置。
【0008】
【発明の実施の形態】
以下、本発明の実施の形態について、図1を参照しながら詳しく説明する。
図1は本発明のごみ焼却飛灰の輸送装置を示す一例の概略図である。
本発明のごみ焼却飛灰の輸送装置は、空気加熱器15と、ごみ焼却プラントから発生したごみ焼却飛灰含有排ガスaを減温塔1で減温処理して捕集されるごみ焼却飛灰(1)を飛灰輸送用配管17に移送する装置と、該減温処理の排ガスを更に第1バグフィルタ7で消石灰処理して捕集されるごみ焼却飛灰(2)を飛灰輸送用配管17のごみ焼却飛灰(1)の移送部の下流側に移送する装置と、第2バグフィルタ19と、飛灰サイロ23と、吸引装置27を備えていて、吸引装置27により、空気加熱器15を介して加熱乾燥空気を飛灰輸送用配管17のごみ焼却飛灰(1)の移送部に取り入れながら、ごみ焼却飛灰(1)とごみ焼却飛灰(2)を飛灰輸送用配管17及び第2バグフィルタ19を経由して飛灰サイロ23に吸引輸送するようにしたものである。以降、ごみ焼却飛灰(1)とごみ焼却飛灰(2)を、飛灰(1)、飛灰(2)と称する。
【0009】
ここで、飛灰(1)を飛灰輸送用配管17に移送する装置は、減温塔1の下流側に位置し、飛灰(1)を減温塔1からスクリューコンベヤロータリーフィーダ5へ搬送するスクリューコンベヤ3と、その飛灰(1)を飛灰輸送用配管17に移送するスクリューコンベヤロータリーフィーダ5を含んで構成される。
また、飛灰(2)を飛灰輸送用配管17に移送する装置は、第1バグフィルタ7の下流側に位置し、飛灰(2)を第1バグフィルタ7から第1バグフィルタダストコンベヤ11へ移送する第1バグフィルタロータリーフィーダ9と、その飛灰(2)を第1バグフィルタダストコンベヤロータリーフィーダ13へ搬送する第1バグフィルタダストコンベヤ11と、その飛灰(2)を飛灰輸送用配管17の飛灰(1)の移送部(スクリューコンベヤロータリーフィーダ5)の下流側に移送する第1バグフィルタダストコンベヤロータリーフィーダ13を含んで構成される。
【0010】
空気加熱器15は、飛灰輸送用配管17の飛灰(1)の移送部の上流側(飛灰(1)の移送経路とは異なる)に設置され、吸引装置27により取り入れた空気を加熱乾燥し、該加熱乾燥空気を吸引装置27により飛灰(1)の移送部に取り入れることができるようにしたものである。第2バグフィルタ19は吸引装置27により飛灰輸送用配管17を通して吸引輸送されるごみ焼却飛灰を捕集できるように該配管17の末端に設置される。また、飛灰サイロ23は、第2バグフィルタロータリーフィーダ21を介して、第2バグフィルタ19で捕集されたごみ焼却飛灰を貯留できるように第2バグフィルタ19の下流に設置される。
【0011】
一方、吸引装置27(好ましくは吸引ブロワ)は、第2バグフィルタ19を通して、空気加熱器15への空気の取り入れ、飛灰輸送用配管17の飛灰(1)の移送部への加熱乾燥空気の取り入れ、及び、飛灰輸送用配管17を通してのごみ焼却飛灰の吸引輸送ができるように、好ましくは空気冷却器25を中間に置いて、第2バグフィルタ19の下流に設置される。
なお、本発明では、第1バグフィルタ7を通過した消石灰処理の排ガスを空気加熱器15に導いて吸引装置27により取り入れた空気を好ましくは95〜150℃に加熱乾燥するための配管29を設置することが好ましい。また、空気加熱器15の上流側にはサイレンサー14を設置してもよい。
【0012】
ごみ焼却プラントから発生したごみ焼却飛灰含有排ガスa(特に都市ごみを焼却炉で焼却する際に発生するごみ焼却飛灰含有排ガス)は、減温塔1において冷却水cを噴霧することによって減温処理され、一部の飛灰(1)が減温塔1で捕集される。例えば、約300℃のごみ焼却飛灰含有排ガスa(流入量約40,000Nm/Hr)が、減温処理では160〜190℃(好ましくは170〜180℃)になるように冷却水c(噴霧量2〜4m/Hr)が噴霧される。減温処理されたごみ焼却飛灰含有排ガス(減温処理の排ガスd)は減温塔1から第1バグフィルタ7へ送られる。このとき減温塔1と第1バグフィルタ7の間の配管へ減温処理の排ガスd中の塩素分を中和するために消石灰bが紛体状(好ましくは粒径約5.0μm)で吹込まれる。吹込まれた消石灰bと減温処理の排ガスdは主として第1バグフィルタ7のろ布面で効率的に反応して塩化カルシウムを含有する飛灰(2)として捕集される(消石灰処理)。このとき消石灰の吹込み量は焼却処理するごみの重量に対しての吹込み重量として10〜30kg/ごみt(更に好ましくは20〜30kg/ごみt)で行なうのが好ましい。また、この反応は160〜190℃(特に170〜180℃)で行なうのが好ましく、パーライト等の反応助剤を更に用いてもよい。
【0013】
減温塔1で捕集された飛灰(1)は減温処理の際の冷却水噴霧により水分を含みシート状や塊状になるため、スクリューコンベヤ3で破砕及び搬送され、スクリューコンベヤロータリーフィーダ5を介して飛灰輸送用配管17に移送される。第1バグフィルタ7で捕集された塩化カルシウムを含有する飛灰(2)も第1バグフィルタロータリーフィーダ9を介し第1バグフィルタダストコンベヤ11で搬送され、更に第1バグフィルタダストコンベヤロータリーフィーダ13を介して飛灰輸送用配管17の飛灰(1)の移送部(スクリューコンベヤロータリーフィーダ5)の下流側に移送される。そして、飛灰輸送用配管17に移送された飛灰(1)及び飛灰(2)は、吸引装置27により、飛灰輸送用配管17及び第2バグフィルタ19を経て飛灰サイロ23に安定的に吸引輸送される。このとき、飛灰輸送用配管17の飛灰(1)の移送部(スクリューコンベヤロータリーフィーダ5)には、吸引装置27により、空気加熱器15を介して加熱乾燥空気が取り入れられる。即ち、吸引装置27により、空気加熱器15に好ましくはサイレンサー14を介して空気が取り入れられ、該空気が空気加熱器15で好ましくは95〜150℃(更に好ましくは95〜110℃)に加熱乾燥され、該加熱乾燥空気が飛灰輸送用配管17の飛灰(1)の移送部に取り入れられる。なお、ごみ焼却飛灰の吸引輸送速度は20〜30m/sec(特に20〜25m/sec)であることが好ましく、空気はこの速度に対応して空気加熱器15に取り入れられる。
本発明の輸送方法は上記のような吸引式による輸送であるため、空気加熱器15から第2バグフィルタ19に至る飛灰輸送用配管17内が負圧(−2000〜−3000mmHO)になって、機械式コンベヤや押込み式の空気輸送方式に比べてダイオキシン等の有害物質を含んだごみ焼却飛灰がロータリーバルブのシール部や配管のフランジ部、更に磨耗や腐食等に起因する配管破損部から系外に飛散する可能性がなく、周囲の環境を汚染することがないのでより安全な輸送方法となる。
【0014】
ごみ焼却飛灰、特に塩化カルシウムを含有するごみ焼却飛灰の輸送にあたっては、塩化カルシウムに吸湿性があり水分を含んで粘性になるため、飛灰が配管内へ付着して堆積成長し閉塞を起こす恐れがある。そこで空気加熱器15により好ましくは95〜150℃に空気を加熱乾燥させて加熱乾燥空気を飛灰輸送用配管17内に取り入れることにより、水分を除去して吸湿を防止し、飛灰の配管内付着による閉塞を防ぐことができる。また、空気加熱器15で空気を加熱する加熱源としてはヒーターを利用することもできるが、第1バグフィルタ7での消石灰処理後に排出される排ガス(160〜190℃)を利用し、これを空気加熱器15に導くことにより空気を加熱乾燥することができ、余剰エネルギーの回収による運転コストの削減に寄与できる。
【0015】
更に、輸送ラインからの放熱による温度低下を防いで輸送中の温度を好ましくは95〜150℃に保つために飛灰輸送用配管17は保温が施されて、スクリューコンベヤ3、第1バグフィルタダストコンベヤ11、第2バグフィルタ19、第2バグフィルタロータリーフィーダ21は、飛灰の搬送、移送及び輸送に支障の無いようにヒーターで加熱されていることが好ましい。更に飛灰サイロ23も、捕集されたごみ焼却飛灰の払出しに支障の無いように保温及び加熱が施されていることが好ましい。
【0016】
第2バグフィルタ19を通過した加熱乾燥空気は、空気冷却器25により冷却されて吸引装置27に吸引されることが好ましい。このときの冷却空気の温度は30〜35℃にするのが好ましい。
【0017】
また、この吸引式の輸送システムには同系列のラインを複数系列設置することが可能であり、複数の減温塔及びバグフィルタから捕集されるごみ焼却飛灰を1ヶ所の飛灰サイロへ集約輸送することができる。
【0018】
【発明の効果】
本発明により、飛灰の系外への飛散を完全に防止し、更に飛灰の吸湿及び配管の閉塞も抑えて、ごみ焼却プラントから発生するごみ焼却飛灰含有排ガスより捕集されるごみ焼却飛灰(特にごみ焼却プラントの排ガスを減温処理して捕集されるごみ焼却飛灰と該減温処理の排ガスを更に消石灰処理して捕集されるごみ焼却飛灰)をより安全に輸送することができる。即ち、吸引によりごみ焼却飛灰を輸送するため、飛灰輸送用配管17内が負圧(−2000〜−3000mmHO)になり、機械式コンベヤや押込み式の空気輸送方式に比べて、ダイオキシン等の有害物質を含んだごみ焼却飛灰が系外に飛散する可能性が無く、より安全な輸送方法となる。
また、吸引式の輸送であるために、飛灰輸送用配管17のごみ焼却飛灰の移送部(スクリューコンベヤロータリーフィーダ5、第1バグフィルタダストコンベヤロータリーフィーダ13)へ搬送されてくる飛灰は、上部への吹き上がりがなくスムーズに輸送できる。
また、吸湿性をもった飛灰は、加熱乾燥空気を取り入れながら輸送されること及び配管のまわりに保温を施して放熱を防止することにより、吸湿を抑制し、配管内への付着がなくなって配管閉塞を防止できる。上記加熱乾燥空気の加熱源として第1バグフィルタ7での消石灰処理後に排出される排ガスを利用して、空気加熱器15に導いて空気を加熱乾燥することで、余剰エネルギーの回収による運転コストの削減に寄与できる。
また、第2バグフィルタ19を通過した高温のガスを冷却して吸引するため、吸引装置27の損傷につながる吸引装置27への悪影響が低減できる。
以上のことにより、ごみ焼却飛灰を外部に漏洩することなく安定して輸送することがが可能になる。
【図面の簡単な説明】
【図1】図1は本発明の一実施例を示す概要図である。
【符号の説明】
1:減温塔
3:スクリューコンベヤ
5:スクリューコンベヤロータリーフィーダ
7:第1バグフィルタ
9:第1バグフィルタロータリーフィーダ
11:第1バグフィルタダストコンベヤ
13:第1バグフィルタダストコンベヤロータリーフィーダ
14:サイレンサー
15:空気加熱器
17:飛灰輸送用配管
19:第2バグフィルタ
21:第2バグフィルタロータリーフィーダ
23:飛灰サイロ
25:空気冷却器
27:吸引装置
29:消石灰処理の排ガス移送配管
a:ごみ焼却飛灰含有排ガス
b:消石灰
c:冷却水
d:減温処理の排ガス
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to refuse incineration fly ash collected from waste incineration fly ash-containing exhaust gas generated from a waste incineration plant, and in particular, refuse collected by reducing the temperature of waste incineration fly ash-containing exhaust gas generated from a waste incineration plant. The present invention relates to a technique for transporting incinerated fly ash and waste gas incinerated by collecting sludge and lime from the exhaust gas from the temperature reduction treatment without scattering the collected fly ash outside the system.
[0002]
[Prior art]
When transporting waste incineration fly ash collected from waste incineration fly ash generated from a waste incineration plant (especially waste incineration fly ash generated when municipal waste is incinerated in an incinerator), it is conventionally used to transport it to silos. In the method, the waste gas containing fly ash from refuse incineration is cooled or treated with slaked lime, and the collected fly ash is transported by a conveyor (Non-Patent Document 1) or collected by a boiler, economizer, and cyclone dust collector. The collected fly ash has been transported through a pneumatic transportation pipe by heated dry air (about 90 ° C.) supplied from a forced blower via an air heater (Patent Document 1). However, in the transportation of the conveyor, there is a problem that the equipment is complicated and maintenance is troublesome, and fly ash containing harmful substances such as dioxin is scattered from the conveyor. In addition, in pneumatic transportation using a push blower, since the inside of the transportation piping is pressurized, leakage from the seal part of the rotary valve, the connection part of the piping, etc., eruption due to piping damage due to wear and corrosion, etc. It is difficult to completely prevent fly ash from scattering, and furthermore, fly ash contains water and has viscosity, so that it may adhere to the inside of the pipe and grow, causing a blockage.
[0003]
[Non-patent document 1]
"Fluidized Bed Handbook" edited by Japan Powder Industry Association, Baifukan, March 25, 1999, p. 376-385
[Patent Document 1]
JP-A-8-200646 (pages 1-3, FIG. 1-2)
[0004]
[Problems to be solved by the invention]
Therefore, the present invention completely prevents fly ash from flying outside the system, further suppresses moisture absorption of fly ash and blockage of pipes, and is collected from waste incineration fly ash-containing exhaust gas generated from a waste incineration plant. Safer refuse incineration fly ash (especially refuse incineration fly ash that is collected by reducing the temperature of waste gas from refuse incineration plants and lime that is collected by further slaked lime treatment of the exhaust gas from the reduced temperature treatment) It is an object of the present invention to provide a method and a device for transporting incinerated fly ash that can be transported to Japan.
[0005]
[Means for Solving the Problems]
The present invention relates to a refuse incineration fly ash (1) collected from a refuse incineration plant generated from a refuse incineration plant by reducing the temperature of the exhaust gas from a waste incineration plant with a cooling tower, and further removing the exhaust gas from the temperature reduction treatment into a first bag filter In the method of transporting refuse incineration fly ash (2) collected by slaked lime treatment in the above, the refuse incineration fly ash (1) is transferred to the fly ash transport pipe and the refuse incineration fly ash (2) is fly ash. The ash from the incineration fly ash (1) is transported to the downstream side of the transfer section of the transportation piping, and the heated and dried air is transferred via the air heater by the suction device to the incineration fly ash (1) in the ash transportation piping. Waste incineration characterized in that the waste incineration fly ash (1) and the waste incineration fly ash (2) are sucked and transported to the fly ash silo via the fly ash transportation pipe and the second bag filter while being incorporated in the section. In the method of transporting fly ash.
[0006]
The present invention also relates to a waste incineration fly ash (1) collected by subjecting a waste incineration fly ash-containing exhaust gas generated from a waste incineration plant to temperature reduction in a cooling tower and the exhaust gas from the temperature reduction treatment. A device for transporting refuse incineration fly ash (2) collected by slaked lime treatment with a bag filter, an air heater, a device for transferring the incineration fly ash (1) to a fly ash transport pipe, and a waste incineration A device for transferring fly ash (2) to the downstream side of the transfer section of refuse incineration fly ash (1) of the fly ash transport pipe, a second bag filter, a fly ash silo, and a suction device, and a suction device. The refuse incineration fly ash (1) and the refuse incineration fly ash (2) are introduced into the transfer section of the refuse incineration fly ash (1) of the fly ash transport pipe via the air heater, and the fly ash It is characterized in that it is sucked and transported to the fly ash silo via the transport pipe and the second bag filter. There is also the transport device of the refuse incineration fly ash to be.
[0007]
Next, preferred embodiments of the present invention will be listed.
(1) The above-described method for transporting refuse incineration fly ash in which air introduced by a suction device in an air heater is heated and dried at 95 to 150 ° C.
(2) The above-mentioned method for transporting incinerated fly ash, wherein the fly ash transport pipe is kept warm while sucking and transporting the incinerated fly ash.
(3) The above-mentioned method for transporting refuse incineration fly ash in which exhaust gas from slaked lime treatment is guided to an air heater to heat and dry the air taken in by a suction device.
(4) The above-mentioned method for transporting refuse incineration fly ash in which an air cooler is provided between the second bag filter and the suction device to cool the heated and dried air passing through the second bag filter.
(5) The above-mentioned refuse incineration fly ash transport device in which the fly ash transportation pipe for sucking and transporting the incineration fly ash is kept warm.
(6) The above refuse incineration fly ash transport device in which the exhaust gas of slaked lime treatment is guided to an air heater to heat and dry the air taken in by a suction device.
(7) The above-mentioned refuse incineration fly ash transport device in which an air cooler is provided between the second bag filter and the suction device so that the heated and dried air passing through the second bag filter can be cooled.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to FIG.
FIG. 1 is a schematic view of an example showing a transport device for incineration fly ash of the present invention.
The refuse incineration fly ash transport device of the present invention comprises an air heater 15 and a refuse incineration fly ash which is collected by reducing the temperature of exhaust gas a containing refuse incineration fly ash generated from a refuse incineration plant in the cooling chamber 1. A device for transferring (1) to the fly ash transport pipe 17; and a waste incineration fly ash (2) collected by slaked lime treatment of the exhaust gas of the temperature reduction treatment by the first bag filter 7 for fly ash transport. The apparatus is provided with a device for transferring waste incineration fly ash (1) downstream of the pipe 17, a second bag filter 19, a fly ash silo 23, and a suction device 27. The refuse incineration fly ash (1) and the refuse incineration fly ash (2) are used for transporting the fly ash (1) and the refuse incineration fly ash (2) while introducing the heating and drying air to the transfer section of the refuse incineration fly ash (1) in the fly ash transportation pipe 17 via the vessel 15. By suction transport to the fly ash silo 23 via the pipe 17 and the second bag filter 19 One in which the. Hereinafter, the refuse incineration fly ash (1) and the refuse incineration fly ash (2) are referred to as fly ash (1) and fly ash (2).
[0009]
Here, the apparatus for transferring fly ash (1) to the fly ash transport pipe 17 is located downstream of the cooling tower 1, and transports the fly ash (1) from the cooling tower 1 to the screw conveyor rotary feeder 5. And a screw conveyor rotary feeder 5 for transferring the fly ash (1) to the fly ash transport pipe 17.
The apparatus for transferring the fly ash (2) to the fly ash transport pipe 17 is located downstream of the first bag filter 7, and transfers the fly ash (2) from the first bag filter 7 to the first bag filter dust conveyor. A first bag filter dust feeder 9 for transferring the fly ash (2) to the first bag filter dust conveyor rotary feeder 13; and a fly ash (2) for the fly ash (2). It includes a first bag filter dust conveyor rotary feeder 13 that transfers the fly ash (1) to the downstream side of the transfer section (the screw conveyor rotary feeder 5) of the transport pipe 17.
[0010]
The air heater 15 is installed upstream (different from the transfer path of the fly ash (1)) of the fly ash (1) transfer section of the fly ash transport pipe 17, and heats the air taken in by the suction device 27. After drying, the heated and dried air can be taken into the fly ash (1) transfer section by the suction device 27. The second bag filter 19 is installed at an end of the pipe 17 so that the incineration fly ash sucked and transported through the fly ash transport pipe 17 by the suction device 27 can be collected. The fly ash silo 23 is installed downstream of the second bag filter 19 via the second bag filter rotary feeder 21 so that the incinerated fly ash collected by the second bag filter 19 can be stored.
[0011]
On the other hand, the suction device 27 (preferably a suction blower) takes in air into the air heater 15 through the second bag filter 19 and heats dry air to the transfer section of the fly ash (1) of the fly ash transport pipe 17. It is preferably installed downstream of the second bag filter 19 with an air cooler 25 placed in the middle so that the incineration and the incineration fly ash can be sucked and transported through the fly ash transport pipe 17.
In the present invention, a pipe 29 for introducing the slaked lime treatment exhaust gas passing through the first bag filter 7 to the air heater 15 and heating and drying the air taken in by the suction device 27 to preferably 95 to 150 ° C. is provided. Is preferred. Further, a silencer 14 may be provided upstream of the air heater 15.
[0012]
Exhaust gas containing waste incineration fly ash a generated from a waste incineration plant (particularly waste gas incineration fly ash generated when municipal waste is incinerated in an incinerator) is reduced by spraying cooling water c in the cooling tower 1. The fly ash (1) is collected in the cooling tower 1 after the heat treatment. For example, the cooling water c (so that the waste gas a containing incineration fly ash containing about 300 ° C. (inflow amount of about 40,000 Nm 3 / Hr) becomes 160 to 190 ° C. (preferably 170 to 180 ° C.) in the temperature reduction treatment. A spray amount of 2 to 4 m 3 / Hr) is sprayed. The exhaust gas containing the incineration fly ash which has been subjected to the temperature reduction treatment (exhaust gas d of the temperature reduction treatment) is sent from the temperature reduction tower 1 to the first bag filter 7. At this time, slaked lime b is blown in a powder form (preferably having a particle size of about 5.0 μm) into the pipe between the cooling tower 1 and the first bag filter 7 in order to neutralize the chlorine content in the exhaust gas d of the cooling process. Be included. The blown slaked lime b and the exhaust gas d of the temperature reduction treatment are efficiently reacted mainly on the filter cloth surface of the first bag filter 7 and collected as fly ash (2) containing calcium chloride (slaked lime treatment). At this time, the amount of slaked lime to be blown is preferably 10 to 30 kg / waste (preferably 20 to 30 kg / waste t) as a blow weight with respect to the weight of the waste to be incinerated. This reaction is preferably performed at 160 to 190 ° C. (particularly 170 to 180 ° C.), and a reaction aid such as pearlite may be further used.
[0013]
The fly ash (1) collected by the cooling tower 1 contains water due to the spray of cooling water during the cooling process and becomes a sheet or a lump, and thus is crushed and conveyed by the screw conveyor 3 and the screw conveyor rotary feeder 5 Is transferred to the fly ash transport pipe 17 via the The fly ash (2) containing calcium chloride collected by the first bag filter 7 is also conveyed by the first bag filter dust conveyor 11 via the first bag filter rotary feeder 9, and further the first bag filter dust conveyor rotary feeder. The fly ash (1) of the fly ash transport pipe 17 is transported to the downstream side of the transport section (the screw conveyor rotary feeder 5) through the fly ash transport pipe 13. The fly ash (1) and fly ash (2) transferred to the fly ash transport pipe 17 are stabilized by the suction device 27 into the fly ash silo 23 through the fly ash transport pipe 17 and the second bag filter 19. It is transported by suction. At this time, the heating and drying air is introduced into the transfer section (screw conveyor rotary feeder 5) of the fly ash (1) of the fly ash transport pipe 17 through the air heater 15 by the suction device 27. That is, air is introduced into the air heater 15 by the suction device 27, preferably through the silencer 14, and the air is heated and dried at the air heater 15 to preferably 95 to 150 ° C (more preferably 95 to 110 ° C). Then, the heated and dried air is taken into the fly ash (1) transfer section of the fly ash transport pipe 17. In addition, it is preferable that the suction transport speed of the refuse incineration fly ash is 20 to 30 m / sec (particularly, 20 to 25 m / sec), and the air is taken into the air heater 15 corresponding to this speed.
Since the transportation method of the present invention is the transportation by suction as described above, the inside of the fly ash transportation pipe 17 from the air heater 15 to the second bag filter 19 is subjected to a negative pressure (−2000 to −3000 mmH 2 O). As compared to mechanical conveyors or push-in pneumatic transportation systems, incineration fly ash containing harmful substances such as dioxin may damage rotary pipe seals and pipe flanges, as well as pipe damage due to wear and corrosion. There is no possibility of scattering from outside the system from the part, and the surrounding environment is not polluted, so that it is a safer transportation method.
[0014]
When transporting refuse incineration fly ash, especially refuse incineration fly ash containing calcium chloride, calcium chloride is hygroscopic and contains water, and becomes viscous. May cause. Therefore, the air is heated and dried preferably at 95 to 150 ° C. by the air heater 15, and the heated and dried air is taken into the fly ash transport pipe 17 to remove moisture and prevent moisture absorption. Blockage due to adhesion can be prevented. Further, a heater can be used as a heating source for heating the air with the air heater 15, but the exhaust gas (160 to 190 ° C.) discharged after the slaked lime treatment in the first bag filter 7 is used. By leading the air to the air heater 15, the air can be dried by heating, which can contribute to a reduction in operating costs due to the recovery of excess energy.
[0015]
Further, in order to prevent a temperature drop due to heat radiation from the transportation line and keep the temperature during transportation preferably at 95 to 150 ° C., the fly ash transportation pipe 17 is kept warm, and the screw conveyor 3, the first bag filter dust, It is preferable that the conveyor 11, the second bag filter 19, and the second bag filter rotary feeder 21 are heated by a heater so as not to hinder the transportation, transfer and transportation of fly ash. Furthermore, it is preferable that the fly ash silo 23 is also kept warm and heated so as not to hinder the dispensing of the collected incineration fly ash.
[0016]
It is preferable that the heated and dried air that has passed through the second bag filter 19 is cooled by the air cooler 25 and sucked by the suction device 27. The temperature of the cooling air at this time is preferably set to 30 to 35 ° C.
[0017]
In addition, the suction-type transportation system can be equipped with multiple lines of the same series, and the incineration fly ash collected from multiple cooling towers and bag filters can be sent to a single fly ash silo. Can be transported collectively.
[0018]
【The invention's effect】
According to the present invention, fly ash is completely prevented from flying out of the system, moisture absorption of fly ash and blockage of pipes are suppressed, and waste incineration collected from waste incineration fly ash-containing exhaust gas generated from a waste incineration plant is included. Safer transport of fly ash (especially refuse incineration fly ash collected by reducing the temperature of waste gas from refuse incineration plants and waste lime that is further treated by slaked lime treatment of the exhaust gas from the reduced temperature treatment) can do. That is, since the incineration fly ash is transported by suction, the pressure inside the fly ash transport pipe 17 becomes negative pressure (−2000 to −3000 mmH 2 O), and dioxin is reduced as compared with a mechanical conveyor or a push-type pneumatic transport system. There is no possibility that incinerated fly ash containing harmful substances such as ash will be scattered outside the system, providing a safer transportation method.
In addition, because of the suction-type transportation, the fly ash that is transported to the transfer unit (the screw conveyor rotary feeder 5 and the first bag filter dust conveyor rotary feeder 13) of the incineration fly ash of the fly ash transport pipe 17 is It can be transported smoothly without rising to the top.
In addition, fly ash with hygroscopicity is transported while taking in heated and dry air, and by keeping the temperature around the piping to prevent heat radiation, moisture absorption is suppressed and adhesion to the piping is eliminated. Pipe clogging can be prevented. The exhaust gas discharged after slaked lime treatment in the first bag filter 7 is used as a heating source of the heated dry air, and is guided to the air heater 15 to heat and dry the air. It can contribute to reduction.
In addition, since the high-temperature gas that has passed through the second bag filter 19 is cooled and sucked, adverse effects on the suction device 27 that may cause damage to the suction device 27 can be reduced.
As described above, the incineration fly ash can be stably transported without leaking to the outside.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing one embodiment of the present invention.
[Explanation of symbols]
1: Temperature reducing tower 3: Screw conveyor 5: Screw conveyor rotary feeder 7: First bag filter 9: First bag filter rotary feeder 11: First bag filter dust conveyor 13: First bag filter dust conveyor rotary feeder 14: Silencer 15: Air heater 17: Fly ash transport pipe 19: Second bag filter 21: Second bag filter rotary feeder 23: Fly ash silo 25: Air cooler 27: Suction device 29: Exhaust gas transfer pipe a for slaked lime treatment a: Waste incineration fly ash-containing exhaust gas b: slaked lime c: cooling water d: exhaust gas for temperature reduction

Claims (9)

ごみ焼却プラントから発生するごみ焼却飛灰含有排ガスを減温塔で減温処理して捕集されるごみ焼却飛灰(1)と該減温処理の排ガスを更に第1バグフィルタで消石灰処理して捕集されるごみ焼却飛灰(2)を輸送する方法において、ごみ焼却飛灰(1)を飛灰輸送用配管に移送すると共に、ごみ焼却飛灰(2)を飛灰輸送用配管のごみ焼却飛灰(1)の移送部の下流側に移送し、吸引装置により、空気加熱器を介して加熱乾燥空気を飛灰輸送用配管のごみ焼却飛灰(1)の移送部に取り入れながら、ごみ焼却飛灰(1)とごみ焼却飛灰(2)を該飛灰輸送用配管及び第2バグフィルタを経由して飛灰サイロに吸引輸送することを特徴とするごみ焼却飛灰の輸送方法。The waste incineration fly ash (1) collected from the waste incineration fly ash-containing exhaust gas generated from the waste incineration plant after being subjected to temperature reduction in a cooling tower and the exhaust gas from the temperature reduction treatment are further subjected to slaked lime treatment with a first bag filter. In the method of transporting the incinerated fly ash (2) collected by the incineration, the incinerated fly ash (1) is transferred to the fly ash transport pipe and the incinerated fly ash (2) is transported to the fly ash transport pipe. The waste incineration fly ash (1) is transported to the downstream side of the transfer section, and the suction device is used to draw heated dry air through the air heater into the transfer section of the waste incineration fly ash (1) in the fly ash transport pipe. Transporting the refuse incineration fly ash by suctioning the refuse incineration fly ash (1) and the refuse incineration fly ash (2) to the fly ash silo via the fly ash transport pipe and the second bag filter Method. 空気加熱器において吸引装置により取り入れた空気を95〜150℃に加熱乾燥する、請求項1記載のごみ焼却飛灰の輸送方法。The method for transporting incinerated fly ash according to claim 1, wherein the air introduced by the suction device in the air heater is heated and dried at 95 to 150C. 飛灰輸送用配管を保温してごみ焼却飛灰を吸引輸送する、請求項1記載のごみ焼却飛灰の輸送方法。The method for transporting incinerated fly ash according to claim 1, wherein the incinerated fly ash is transported by suction while keeping the fly ash transport pipe warm. 消石灰処理の排ガスを空気加熱器に導いて吸引装置により取り入れた空気を加熱乾燥する、請求項1又は2記載のごみ焼却飛灰の輸送方法。The method for transporting incinerated fly ash according to claim 1 or 2, wherein the exhaust gas from the slaked lime treatment is guided to an air heater to heat and dry the air taken in by a suction device. 第2バグフィルタと吸引装置の間に空気冷却器を設置して第2バグフィルタを通過した加熱乾燥空気を冷却する、請求項1記載のごみ焼却飛灰の輸送方法。The method for transporting incinerated fly ash according to claim 1, wherein an air cooler is provided between the second bag filter and the suction device to cool the heated and dried air passing through the second bag filter. ごみ焼却プラントから発生するごみ焼却飛灰含有排ガスを減温塔で減温処理して捕集されるごみ焼却飛灰(1)と該減温処理の排ガスを更に第1バグフィルタで消石灰処理して捕集されるごみ焼却飛灰(2)を輸送する装置において、空気加熱器と、ごみ焼却飛灰(1)を飛灰輸送用配管に移送する装置と、ごみ焼却飛灰(2)を飛灰輸送用配管のごみ焼却飛灰(1)の移送部の下流側に移送する装置と、第2バグフィルタと、飛灰サイロと、吸引装置を備え、吸引装置により、空気加熱器を介して加熱乾燥空気を飛灰輸送用配管のごみ焼却飛灰(1)の移送部に取り入れながら、ごみ焼却飛灰(1)とごみ焼却飛灰(2)を該飛灰輸送用配管及び第2バグフィルタを経由して飛灰サイロに吸引輸送するようにしたことを特徴とするごみ焼却飛灰の輸送装置。The waste incineration fly ash (1) collected from the waste incineration fly ash-containing exhaust gas generated from the waste incineration plant after being subjected to temperature reduction in a cooling tower and the exhaust gas from the temperature reduction treatment are further subjected to slaked lime treatment with a first bag filter. A device for transporting refuse incineration fly ash (2) collected by the air heater, a device for transferring the refuse incineration fly ash (1) to the fly ash transportation pipe, and a refuse incineration fly ash (2) It is equipped with a device for transferring refuse incineration fly ash (1) downstream of the fly ash transport pipe, a second bag filter, a fly ash silo, and a suction device. The waste incineration fly ash (1) and the waste incineration fly ash (2) are taken into the fly ash transportation pipe and the second while the heat drying air is introduced into the transfer section of the waste incineration fly ash (1) of the fly ash transportation pipe. Garbage incineration characterized by suction and transport to fly ash silo via bag filter Ash of the transport device. ごみ焼却飛灰を吸引輸送する飛灰輸送用配管に保温を施した、請求項6記載のごみ焼却飛灰の輸送装置。The incinerator fly ash transport device according to claim 6, wherein the fly ash transport pipe for sucking and transporting the incinerated fly ash is kept warm. 消石灰処理の排ガスを空気加熱器に導いて吸引装置により取り入れた空気を加熱乾燥するようにした、請求項6記載のごみ焼却飛灰の輸送装置。The ash incineration fly ash transport device according to claim 6, wherein the waste gas from the slaked lime treatment is led to an air heater to heat and dry the air taken in by a suction device. 第2バグフィルタと吸引装置の間に空気冷却器を設置して第2バグフィルタを通過した加熱乾燥空気を冷却できるようにした、請求項6記載のごみ焼却飛灰の輸送装置。The garbage incineration fly ash transport device according to claim 6, wherein an air cooler is provided between the second bag filter and the suction device so that the heated and dried air passing through the second bag filter can be cooled.
JP2002315350A 2002-10-30 2002-10-30 Method and device for transporting refuse incineration fly ash Pending JP2004150683A (en)

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Publication number Priority date Publication date Assignee Title
CN103438469A (en) * 2013-08-07 2013-12-11 华电电力科学研究院 Fly ash separating and conveying system of economizer
JP2014221455A (en) * 2013-05-13 2014-11-27 住友重機械工業株式会社 Apparatus and method for conveying fly ash
JP2014221454A (en) * 2013-05-13 2014-11-27 住友重機械工業株式会社 Apparatus and method for conveying fly ash
CN108787717A (en) * 2018-08-01 2018-11-13 西安空天能源动力智能制造研究院有限公司 A kind of incineration of refuse flyash particle pre-heating device
CN109556127A (en) * 2018-12-12 2019-04-02 深圳市能源环保有限公司 A kind of air soot blower control system of flying ash of garbage cremator conveyance conduit
CN109556123A (en) * 2018-12-12 2019-04-02 深圳市能源环保有限公司 A kind of flying ash of garbage cremator transportation system

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014221455A (en) * 2013-05-13 2014-11-27 住友重機械工業株式会社 Apparatus and method for conveying fly ash
JP2014221454A (en) * 2013-05-13 2014-11-27 住友重機械工業株式会社 Apparatus and method for conveying fly ash
CN103438469A (en) * 2013-08-07 2013-12-11 华电电力科学研究院 Fly ash separating and conveying system of economizer
CN103438469B (en) * 2013-08-07 2015-09-02 华电电力科学研究院 A kind of economizer flying dust is separated induction system
CN108787717A (en) * 2018-08-01 2018-11-13 西安空天能源动力智能制造研究院有限公司 A kind of incineration of refuse flyash particle pre-heating device
CN109556127A (en) * 2018-12-12 2019-04-02 深圳市能源环保有限公司 A kind of air soot blower control system of flying ash of garbage cremator conveyance conduit
CN109556123A (en) * 2018-12-12 2019-04-02 深圳市能源环保有限公司 A kind of flying ash of garbage cremator transportation system
CN109556127B (en) * 2018-12-12 2024-02-06 深圳能源环保股份有限公司 Air soot blowing control system of fly ash conveying pipeline of garbage incinerator

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