JP4082183B2

JP4082183B2 - Exhaust gas cooling tower and dust collector

Info

Publication number: JP4082183B2
Application number: JP2002328954A
Authority: JP
Inventors: 光男本杉; 勉高橋
Original assignee: IHI Corp
Current assignee: IHI Corp
Priority date: 2002-11-13
Filing date: 2002-11-13
Publication date: 2008-04-30
Anticipated expiration: 2022-11-13
Also published as: JP2004162989A

Description

【０００１】
【発明の属する技術分野】
本発明は、筒状構造物の底面に降り積もったダストをかき寄せて排出するダストかき寄せ機に係る。特にスクレーパの構造に特徴があり、ダストを含んだ排ガスを冷却する排ガス冷却塔に好適なダストかき寄せ機とそのダストかき寄せ機を備えた排ガス冷却塔に関する。
【０００２】
【従来の技術】
各種のプラントでは、ダストを含んだ高温の排ガスを冷却するために排ガス冷却塔を用いることがある。
排ガス冷却塔は、高温の排ガスを導入する入口付近に水噴射をおこない、噴霧冷却水と高温の排ガスを気液接触させる。減温した排ガスは排ガス冷却塔の中を下降し、下部側より排出され、例えば、後流の集塵機へ送られる。排ガス中のダストの一部は、排ガス冷却塔の床面に降り積もる。
【０００３】
ダストかき寄せ機が、灰ガス冷却塔の底に設けられ、底に積もったダストを床に設けられたダスト排出口より外へ排出する。
ダストかき寄せ機は、スクレーパ取付フレームとスクレーパと駆動機構とで構成される。
スクレーパ取付フレームは、床面の中心部で回転する構造体である。スクレーパが長手方向を水平にしてスクレーパ取付フレームに取り付けられる。スクレーパ取付フレームが回転すると、スクレーパが底部に溜まったダストを掃く。ダストは、スクレーパにより掃き寄せられ、ダスト排出口から外部へ排出される。二重ダンパがダスト排出口に設けられ、排出されたダストを切り出す。
【０００４】
ダストの性状と噴霧する水の量によって、ダストの付着性が高まって、ダストが底面や内壁面に付着しやすくなる。
ダストの付着性が高まると、スクレーパがダストから大きな抵抗を受けて、スクレーパを回転するのに大きな力が必要になる。
底面や内壁面に付着したダストが固くなると、スクレーパを回転するのに必要な力がさらに大きくなり、スクレーパを駆動する駆動機構が停止してしまうこともある。
【０００５】
【非特許文献１】
石川禎昭著、「流動床式ごみ焼却炉設計の実務」、増補改訂版、日本国、工業出版社、平成６年８月２０日、１３４頁、図３．７ー１
【０００６】
【発明が解決しようとする課題】
従って、排ガス冷却塔等の排ガス処理塔の内部に積もったダストの粘着性が高くなっても、少ない動力で、確実にダストを排出することのできるダストかき寄せ機とそのダストかき寄せ機を備えた排ガス冷却塔が要請されていた。
【０００７】
本発明は以上に述べた問題点に鑑み案出されたもので、従来のダストを含んだ排ガスを冷却する排ガス冷却塔にかわって、少ない動力で、確実にダストを排出することのできるダストかき寄せ機とそのダストかき寄せ機を備えた排ガス冷却塔を提供しようとする。
【０００８】
【課題を解決するための機構】
上記目的を達成するため、本発明に係るダストを含んだ排ガスを冷却する排ガス冷却塔を、ダストを排出する排出口を設けられた底面と該底面から上方に立ち上がった内壁面とを有する冷却塔本体と、前記底面に取り付けられ垂直軸回りに回転するスクレーパ取付フレームと該スクレーパ取付フレームに取り付けられた部材であるスクレーパと前記スクレーパ取付フレームを回転させる駆動機構とを有するダストかき寄せ機と、を備え、前記スクレーパが前記スクレーパ取付フレームに取り付けられ長手方向を水平方向に沿った長手部材であるスクレーパフレームと該スクレーパフレームに支持され前記底面に溜まったダストを下に向いた縁で掃く板である複数の羽根板とを持つ、ものとした。
【０００９】
上記本発明の構成により、冷却塔本体がダストを排出する排出口を設けられた底面と該底面から上方に立ち上がった内壁面とを有し、スクレーパ取付フレームが前記底面に取り付けられ垂直軸回りに回転し、スクレーパが該スクレーパ取付フレームに取り付けられ、駆動機構が前記スクレーパ取付フレームを回転させ、スクレーパフレームが前記スクレーパ取付フレームに取り付けられ長手方向を水平方向に沿った長手部材であり、複数の羽根板が該スクレーパフレームに支持され底面に溜まったダストを下に向いた縁で掃くので、スクレーパ取付フレームが回転して、スクレーパフレームが前記底面の上部を移動し、スクレーパフレームに支持された複数の羽根板が底面に積もったダストを掃いて、前記底面に積もった排ガスのダストが排出口にはき寄せられる。
【００１０】
さらに、本発明に係る排ガス冷却塔は、複数の前記羽根板が、面を前記スクレーパフレームの移動する向きに所定の角度で交差させ、前記スクレーパフレームの長手方向に所定の間隔を空けて配されるのが好ましい。
上記本発明の構成により、長手方向に所定の間隔を空けて配される複数の羽根板が、面を前記スクレーパフレームの移動する向きに所定の角度で交差させるので、個々の羽根板がダストを掃く抵抗力が小さく、スクレーパフレームに作用する抵抗トルクが小さく、スクレーパ取付フレームは少ないトルクで回転できる。
【００１１】
さらに、本発明に係る排ガス冷却塔は、各々の前記羽根板が前記スクレーパ取付フレームの回転に伴って前記床面の帯状の領域である床領域を掃き、各々の前記床領域が重なり合って前記床面をほぼ覆っているのが好ましい。
上記本発明の構成により、各々の該床領域が重なり合って前記床面をほぼ覆っているので、複数の前記羽根板が移動することにより前記底面に積もったダストを掃くことが出来る。
【００１２】
さらに、本発明に係る排ガス冷却塔は、前記垂直軸を中心とし円弧が前記排出口を跨ぐピッチ円を仮想した場合、前記スクレーパ取付フレームが回転する毎に、前記羽根板がダストを前記ピッチ円の円弧の方へ掃き寄せるのが好ましい。
上記本発明の構成により、前記スクレーパ取付フレームが回転する毎に、前記羽根板がダストを前記ピッチ円の円弧の方へ掃き寄せるので、ダストがピッチ円の円弧上に集まり前記排出口から順次排出される。
【００１３】
さらに、本発明に係る排ガス冷却塔は、前記羽根板の下に向いた縁が凹部と凸部の連なりでできているのが好ましい。
上記本発明の構成により、前記羽根板の下に向いた縁が凹部と凸部の連なりでできているので、凹部でのダストを掃き寄せる抵抗が凸部でのダストを掃き寄せる抵抗よりも小さく、個々の羽根板がダストを掃く抵抗力がより小さく、スクレーパフレームに作用する抵抗トルクがより小さく、スクレーパ取付フレームはより少ないトルクで回転できる。
【００１４】
さらに、本発明に係る排ガス冷却塔は、前記スクレーパが前記スクレーパフレームに支持され前記内壁面に付着したダストを前記内壁面に向いた縁で引っ掻く板であるかき爪を持つのが好ましい。
上記本発明の構成により、かき爪が、該スクレーパフレームに支持され前記内壁面に付着したダストを前記内壁面に向いた縁で引っ掻くので、内壁面に付着したダストが崩壊して底面に落ち、順次排出口から排出される。
【００１５】
さらに、本発明に係る排ガス冷却塔は、前記スクレーパが、該スクレーパフレームに支持され前記内壁面に付着したダストを前記内壁面に向いた縁で引っ掻く板である複数のかき爪を持ち、複数の前記かき爪が上下に所定の間隔をあけて配されるのが好ましい。
上記本発明の構成により、前記複数のかき爪が上下に所定の間隔をあけて配されるので、個々のかき爪がダストを引っ掻く抵抗力が小さく、スクレーパフレームに作用する抵抗トルクが小さく、スクレーパ取付フレームは少ないトルクで回転できる。
【００１６】
さらに、本発明に係る排ガス冷却塔は、前記かき爪が面を上下に向けているのが好ましい。
上記本発明の構成により、前記かき爪の面が上下に向けているので、かき爪の面に作用するダストの抵抗力が小さく、スクレーパフレームに作用する抵抗トルクが小さく、スクレーパ取付フレームは少ないトルクで回転できる。
【００１７】
さらに、本発明に係る排ガス冷却塔は、各々のかき爪が前記スクレーパ取付フレームの回転に伴って前記内壁面の帯状の領域である内壁領域を引っ掻き、各々の該内壁領域が重複しないのが好ましい。
上記本発明の構成により、各々の前記内壁領域が重複しないので、前記かき爪が前記スクレーパ取付フレームの回転に伴って前記内壁領域に付着したダストを掻き落とし、残ったダストが自重で落下するので、すくない動力で前記内壁面に付着したダストを掻き落とすことができる。
【００１８】
また、上記目的を達成するため、本発明に係るダストを排出する排出口を設けられた底面と該底面から上方に立ち上がった内壁面とを有する排ガス処理塔に溜まったダストを排出口へかき寄せるダストかき寄せ機を、前記底面に取り付けられ垂直軸回りに回転するスクレーパ取付フレームと、該スクレーパ取付フレームに取り付けられた部材であるスクレーパと、前記スクレーパ取付フレームを回転させる駆動機構と、を備え、前記スクレーパが前記スクレーパ取付フレームに取り付けられ長手方向を水平方向に沿った長手部材であるスクレーパフレームと該スクレーパフレームに支持され底面に溜まったダストを下に向いた縁で掃く板である複数の羽根板とを持つ、ものとした。
【００１９】
上記本発明の構成により、スクレーパ取付フレームが前記底面に取り付けられ垂直軸回りに回転し、スクレーパが該スクレーパ取付フレームに取り付けられ、駆動機構が前記スクレーパ取付フレームを回転させ、スクレーパフレームが前記スクレーパ取付フレームに取り付けられ長手方向を水平方向に沿った長手部材であり、複数の羽根板が該スクレーパフレームに支持され底面に溜まったダストを下に向いた縁で掃くので、スクレーパ取付フレームが回転して、スクレーパフレームが底面の上部を移動し、スクレーパフレームに支持された複数の羽根板が底面に積もったダストを掃いて、底面に積もった排ガスのダストが排出口にはき寄せられる。
【００２０】
さらに、本発明に係るダストかき寄せ機は、複数の前記羽根板が、面を前記スクレーパフレームの移動する向きに所定の角度で交差させ、前記スクレーパフレームの長手方向に所定の間隔を空けて配されのが好ましい。
上記本発明の構成により、長手方向に所定の間隔を空けて配される複数の羽根板が、面を前記スクレーパフレームの移動する向きに所定の角度で交差させるので、個々の羽根板がダストを掃く力が小さく、スクレーパフレームに作用する抵抗トルクが小さく、スクレーパ取付フレームは少ないトルクで回転できる。
【００２１】
さらに、本発明に係るダストかき寄せ機は、各々の前記羽根板が前記スクレーパ取付フレームの回転に伴って前記床面の帯状の領域である床領域を掃き、各々の該床領域が重なり合って前記床面をほぼ覆っているのが好ましい。
上記本発明の構成により、各々の該床領域が重なり合って前記床面をほぼ覆っているので、複数の羽根板が移動することにより前記底面に積もったダストを掃くことが出来る。
【００２２】
さらに、本発明に係るダストかき寄せ機は、前記垂直軸を中心とし円弧が前記排出口を跨ぐピッチ円を仮想した場合、前記スクレーパ取付フレームが回転する毎に、前記羽根板がダストを前記ピッチ円の円弧の方へ掃き寄せるのが好ましい。
上記本発明の構成により、前記スクレーパ取付フレームが回転する毎に、前記羽根板がダストを前記ピッチ円の円弧の方へ掃き寄せるので、ダストがピッチ円の円弧上に集まり前記排出口から順次排出される。
【００２３】
さらに、本発明に係るダストかき寄せ機は、前記羽根板の下に向いた縁が凹部と凸部の連なりでできているのが好ましい。
上記本発明の構成により、前記羽根板の下に向いた縁が凹部と凸部の連なりでできているので、凹部でのダストを掃き寄せる抵抗が凸部でのダストを掃き寄せる抵抗よりも小さく、個々の羽根板がダストを掃く力がより小さく、スクレーパフレームに作用する抵抗トルクがより小さく、スクレーパ取付フレームはより少ないトルクで回転できる。
【００２４】
さらに、本発明に係るダストかき寄せ機は、前記スクレーパが該スクレーパフレームに支持され内壁面に付着したダストを内壁面に向いた縁で引っ掻く板であるかき爪を持つのが好ましい。
上記本発明の構成により、かき爪が、該スクレーパフレームに支持され内壁面に付着したダストを前記内壁面に向いた縁で引っ掻くので、内壁面に付着したダストが崩壊して底面に落ち、順次排出口から排出される。
【００２５】
さらに、本発明に係るダストかき寄せ機は、前記スクレーパが該スクレーパフレームに支持され前記内壁面に付着したダストを前記内壁面に向いた縁で引っ掻く板である複数のかき爪を持ち、複数の前記かき爪が上下に所定の間隔をあけて配されるのが好ましい。
上記本発明の構成により、前記複数のかき爪が上下に所定の間隔をあけて配されるので、個々のかき爪がダストを引っ掻く抵抗力が小さく、スクレーパフレームに作用する抵抗トルクが小さく、スクレーパ取付フレームは少ないトルクで回転できる。
【００２６】
さらに、本発明に係るダストかき寄せ機は、前記かき爪が面を上下に向けているのが好ましい。
上記本発明の構成により、前記かき爪の面が上下に向けているので、かき爪の面に作用するダストの抵抗力が小さく、スクレーパフレームに作用する抵抗トルクが小さく、スクレーパ取付フレームは少ないトルクで回転できる。
【００２７】
さらに、本発明に係るダストかき寄せ機は、各々のかき爪が前記スクレーパ取付フレームの回転に伴って内壁面の帯状の領域である内壁領域を引っ掻き、各々の該内壁領域が重複しないのが好ましい。
上記本発明の構成により、各々の該内壁領域が重複しないので、かき爪が前記スクレーパ取付フレームの回転に伴って内壁面の内壁領域に付着したダストを掻き落とし、残ったダストが自重で落下するので、すくない動力で前記内壁面に付着したダストを掻き落とすことができる。
【００２８】
【発明の実施の形態】
以下、本発明の好ましい実施形態を、図面を参照して説明する。なお、各図において、共通する部分には同一の符号を付し、重複した説明を省略する。
【００２９】
本発明の実施形態に係る排ガス冷却塔を説明する。図１は、本発明の実施形態に係る排ガス冷却塔の全体正面図である。図２は、本発明の実施形態に係る排ガス冷却塔の部分正面図である。図３は、本発明の実施形態に係る排ガス冷却塔の平面断面図である。図４は、本発明の実施形態に係る排ガス冷却塔の部分詳細図その１である。図５は、本発明の実施形態に係る排ガス冷却塔の部分詳細図その２である。図６は、本発明の実施形態に係る排ガス冷却塔の部分詳細図その３である。
【００３０】
排ガス冷却塔１は、ダストを含んだ排ガスＧを冷却する装置であって、冷却塔本体２と水噴霧装置３とダストかき寄せ機４とダスト排出機構５とで構成される。
冷却塔本体２は、ダストを排出する排出口Ｍを設けられた円形の底面Ｆと該底面から上方に立ち上がった内壁面Ｈとを有する装置であり、溶接鋼板構造の外部ケーシングとその内面にはられた耐火構造とで構成される。
通常の冷却塔本体２は、垂直に立った円筒状構造物であり、上部に排ガス導入口を設けられ、下部側面に排ガス排気口を設けられる。
【００３１】
水噴霧装置３は、冷却塔本体２の内部に水を噴霧する装置である。
水噴霧装置３は、冷却塔本体２の側壁の上部に側壁を貫通して内部に噴射口を向けた複数のノズルを備える。
排ガスは、排ガス導入口から入り、水噴霧装置３により噴霧される水に直接接触して冷却され、冷却塔本体２の内部を降下し、排ガス排気口から出る。その際に、排ガス中のダストが、冷却塔本体２の底面に降り積もる。
【００３２】
ダストかき寄せ機４は、冷却塔本体２の底面Ｆに積もったダストをかき寄せて、排出口Ｍに集める装置である。
ダストかき寄せ機４は、垂直軸回りに回転し底面Ｆの上を掃いて、ダストを排出口Ｍに集める。
ダストは、ダストかき寄せ機４によりかき寄せられて、排出口Ｍから下に落ちる。
【００３３】
ダスト排出機構５は、排出口Ｍに落ちたダストを切り出す装置である。ダスト排出装置５は、例えば、２重ダンパであり、ダストを定期的に排出する。
【００３４】
次に、ダストかき寄せ機４の構造を詳述する。
ダストかき寄せ機４は、スクレーパ取付フレーム１０とスクレーパ２０と駆動機構３０とで構成される。
スクレーパ取付フレーム１０は、底面Ｆの中央部に取り付けられ垂直軸回りに回転する構造である。後述する駆動機構３０の回転駆動軸が底面Ｆの中央部に回転軸を垂直にして取り付けられ、スクレーパ取付フレーム１０はその回転駆動軸に固定され、回転する。
円錐状の傘状構造物がスクレーパ取付フレーム１０の上部に設けられる。円錐の母線はダストの安息角を越えて傾いている。
後述するスクレーパ２０を固定するフランジが、スクレーパ取付フレーム１０の側面に設けられる。
図３では、スクレーパ取付フレーム１０に取り付けられた４つのスクレーパ２０を示している。
【００３５】
スクレーパ２０は、スクレーパ取付フレーム１０に支持されて回転し床面Ｆのダストを掃く機構であり、スクレーパフレーム２１と複数の羽根板２２と複数のかき爪２３と羽根板支持体２４とで構成される。
スクレーパフレーム２１は、スクレーパ取付フレーム１０に一端を取り付けられ長手方向を水平方向に沿った長手部材である。
図２と図３は、スクレーパ取付フレーム１０のフランジにそれぞれ取り付けられた４つのスクレーパフレーム２１を示している。スクレーパフレーム２１は、鋼板を溶接して製造され、面を垂直に立てた板が上から見て矩形に折り曲げられた形状をしている。
【００３６】
羽根板２２は、スクレーパフレーム２１に支持され底面Ｆに溜まったダストを下に向いた縁で掃く板である。
前記羽根板の下に向いた縁が凹部ａと凸部ｂの連なりでできている。
図５には、下の縁が矩形の凹部ａと矩形の凸部ｂの連なりでできており、上部をスクレーパフレーム２１に支持された羽根板２２が示されている。
複数の羽根板２２が、面をスクレーパフレームの移動する向きに所定の角度で交差させ、半径方向に所定の間隔を空けて配される。すなわち、スクレーパフレームの長手方向の基準線がスクレーパ取付フレームの回転する垂直軸に交差する場合、複数の羽根板２２の面がスクレーパフレームのその基準線の直交方向に所定の角度（例えば、５度から３０度のうちの度）で交差する。
さらに、最外周に配される羽根板２２の側縁の下部は、凹部ａと凸部ｂの連なりでできている。
図４には、下の縁が矩形の凹部ａと矩形の凸部ｂの連なりでできており、側の縁が三角形の凹部ａと三角形の凸部ｂの連なりでできており、上部をスクレーパフレーム２１に支持された羽根板２２が示されている。
【００３７】
垂直軸を中心とし円弧が前記排出口Ｍを跨ぐピッチ円Ｌを仮想した場合、スクレーパ取付フレーム１０が回転する毎に、羽根板２４がダストを前記ピッチ円Ｌの円弧の方へ掃き寄せる。
図７には、羽根板２２がダストをピッチ円Ｌの円弧の方向へ掃く様子が白抜きの矢印で示されている。
各々の前記羽根板２２がスクレーパ取付フレーム１０の回転に伴って床面Ｆを帯状に掃く。この床面Ｆの帯状の領域を床領域Ｄと仮に呼ぶ。スクレーパ２０毎の羽根板２２の各々の該床領域Ｆが重なり合って床面Ｆのほぼ全体を覆っている。ほぼ全体とは、床面のうち中央部を除く意味である。
図３には、４つのスクレーパ２０がスクレーパ取付フレーム１０の円周に均等に配され、複数の羽根板２２が各々のスクレーパフレーム２１の半径方向にスクレーパ２０毎に異なる間隔で配されているのが示されている。従って、それぞれの羽根板２２が帯状に底面Ｆを掃き、その帯状の領域が重複部を持ちながら重なり合って、全体として底面Ｆを覆っている。
【００３８】
かき爪２３は、スクレーパフレーム２１に支持され内壁面Ｈに付着したダストを内壁面に向いた縁で引っ掻く板である。
かき爪２３が、面を上下に向けてスクレーパフレーム２１に固定される。
図６には、スクレーパフレーム２１にボルトで固定されている３枚のかき爪２３が示されている。
各々のスクレーパフレーム２１に支持されたかき爪２３がスクレーパ取付フレーム１０の回転に伴って内壁面Ｈを帯状に引っ掻く。この帯状の領域を内壁領域Ｅと仮に呼ぶ。スクレーパ毎のかき爪２３の各々の内壁領域Ｅが重複しないのが好ましい。
例えば、図６に示した３つのかき爪２３を一組として、４組のかき爪２３が、４つのスクレーパフレームに異なる高さ位置で固定される。
【００３９】
羽根板支持体２４は、羽根板２２の中間部を固定し、羽根板２２を固定する部材である。
【００４０】
駆動機構３０は、スクレーパ取付フレーム１０を回転駆動する装置である。
駆動機構３０は、軸心を垂直にした回転軸とその回転軸を回転する動力を持つ。
回転軸が、底面Ｆの中央部に突き出て、スクレーパ取付フレーム１０を支持する。
【００４１】
次に、排ガス冷却塔とそのダストかき寄せ機の作用を説明する。
図７は、本発明の実施形態に係るダストかき寄せ機の作用説明図である。
高温の排ガスＧが、排ガス導入口から排ガス冷却塔本体２へ入る。排ガスＧは、排ガス冷却塔本体２の内部を下りながら水噴射装置３の噴霧する水に直接接触し、温度を下げ、排ガス排気口から外部へでる。
排ガスＧ中のダストは、内側面Ｈに付着し、底面Ｆに降り積もる。スクレーパ取付フレーム１０に落ちたダストは、傘状構造物の上を滑って、床面Ｆに落ちる。
駆動機構３０が、スクレーパ取付フレーム１０を垂直軸回りに回転させる。
スクレーパ２０が、床面Ｆの上を回転軸を中心に回転移動する。
羽根板２２の下の縁が底面Ｆに積もったダストを掃く。ダストが、羽根板２２に掃かれて、回転軸を中心に回転する方向へ移動しながら、ピッチ線Ｌの円弧の方向へ移動する。ダストは、複数の羽根板２２に掃かれながら、順次排出口Ｍへ入る。
ダストが、内壁面Ｈに付着する。
かき爪２３が内壁面Ｈの内壁領域Ｅに付着したダストをかき落とす。
複数のかき爪２３が内壁領域Ｅのダストを書き落とすと、内壁面Ｈに付着して帯状に残ったダストが自重で崩落する。
落下したダストは羽根板２２の下の縁に掃かれて、排出口Ｍへはき寄せられる。
ダストは、排出口Ｍに一定量溜まったあとで、ダスト排出機構５により外部へ切り出される。
【００４２】
上述の実施形態のダストかき寄せ機とこのダストかき寄せ機を備えた排ガス冷却塔とを用いれば、少ない動力で底面に積もったダストをかき寄せることができる。
また、複数の羽根板がスクレーパフレームの移動する向きに所定の角度で交差させて配されるので、羽根板に作用するダストの抵抗が小さく、少ない動力で多くのダストをかき寄せることができる。
また、各々の羽根板のかき寄せる床領域が重なり合って床面をほぼ覆うので、すくない動力で、床面のダストをかき寄せることができる。
また、各羽根板が移動しつつダストをピッチ円の円弧の方向へかき寄せるので、効率良くダストを排出口へ誘導できる。
また、羽根板の下の縁が凹部と凸部の連なりでできているので、羽根板にかかる抵抗力が少なく、スクレーパを回転させる動力が少なくて済む。
また、側壁を引っ掻くかき爪を設けたので、側壁に付着したダストをかき落とすことができる。
また、かき爪が面を上に向けており、かき爪が引っ掻く内壁領域が重複しないので、全体のかき爪に作用する抵抗力が小さく、スクレーパを回転させる動力が少なくて済む。
【００４３】
本発明は以上に述べた実施形態に限られるものではなく、発明の要旨を逸脱しない範囲で各種の変更が可能である。
ダストかき寄せ機を水直接接触式の排ガス冷却塔を例に説明したがこれに限定されず、その他の排ガス処理塔にも適用できる。
排ガス冷却塔の底面を円形であるとして説明したがこれに限定されず、例えば、底面が２の円が一部重複した眼鏡型でもよい。
【００４４】
【発明の効果】
以上説明したように本発明の排ガス冷却塔とダストかき寄せ機は、その構成により、以下の効果を有する。
ダストを掃く複数の羽根板をスクレーパフレームに設けたので、スクレーパ取付フレームに取り付けられたスクレーパフレームが底面の上部を回転移動し、スクレーパフレームに支持された複数の羽根板が底面に積もったダストを掃いて、底面に積もった排ガスのダストが排出口にはき寄せられる。
また、複数の羽根板が、面を前記スクレーパフレームの移動する向きに所定の角度で交差させ、長手方向に所定の間隔を空けて配されるので、個々の羽根板がダストを掃く抵抗力が小さく、スクレーパフレームに作用する抵抗トルクが小さく、スクレーパ取付フレームは少ないトルクで回転できる。
また、各々の該床領域が重なり合ってほぼ床面を覆っているので、底面に積もったダストを掃くことが出来る。
また、前記スクレーパ取付フレームが回転する毎に、前記羽根板がダストを前記ピッチ円の円弧の方へ掃き寄せるので、ダストがピッチ円の円弧上に集まり前記排出口から順次排出される。
また、前記羽根板の下に向いた縁が凹部と凸部の連なりでできているので、個々の羽根板がダストを掃く抵抗力がより小さく、スクレーパフレームに作用する抵抗トルクがより小さく、スクレーパ取付フレームはより少ないトルクで回転できる。
また、かき爪が、該スクレーパフレームに支持され内壁面に付着したダストを内壁面に向いた縁で引っ掻くので、内壁面に付着したダストが崩壊して底面に落ち、順次排出口から排出される。
また、前記かき爪が上下に所定の間隔をあけて配されるので、個々のかき爪がダストを引っ掻く抵抗力が小さく、スクレーパフレームに作用する抵抗トルクが小さく、スクレーパ取付フレームは少ないトルクで回転できる。
また、前記かき爪の面が上下に向けているので、引っ掻き板の面に作用するダストの抵抗力が小さく、スクレーパフレームに作用する抵抗トルクが小さく、スクレーパ取付フレームは少ないトルクで回転できる。
また、各々の該内壁領域が重複しないので、かき爪が前記スクレーパ取付フレームの回転に伴って内壁面の内壁領域に付着したダストを掻き落とし、残ったダストが自重で落下するので、すくない動力で内壁面に付着したダストを掻き落とすことができる。
従って、少ない動力で、確実にダストを排出することのできるダストかき寄せ機とそのダストかき寄せ機を備えた排ガス冷却塔を提供できる。
【００４５】
【図面の簡単な説明】
【図１】本発明の実施形態に係る排ガス冷却塔の全体正面図である。
【図２】本発明の実施形態に係る排ガス冷却塔の部分正面図である。
【図３】本発明の実施形態に係る排ガス冷却塔の平面断面図である。
【図４】本発明の実施形態に係る排ガス冷却塔の部分詳細図その１である。
【図５】本発明の実施形態に係る排ガス冷却塔の部分詳細図その２である。
【図６】本発明の実施形態に係る排ガス冷却塔の部分詳細図その３である。
【図７】本発明の実施形態に係るダストかき寄せ機の作用説明図である。
【符号の説明】
ａ凹部
ｂ凸部
Ｄ床領域
Ｅ内壁領域
Ｆ床面
Ｇ排ガス
Ｈ内壁面
Ｗ水
１排ガス冷却塔
２排ガス冷却塔本体
３水噴射装置
４ダストかき寄せ機
５ダスト排出機構
１０スクレーパ取付フレーム
２０スクレーパ
２１スクレーパフレーム
２２羽根板
２３かき爪
２４羽根板支持体
３０駆動機構[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a dust scraper that scrapes and discharges dust accumulated on the bottom surface of a cylindrical structure. In particular, the present invention relates to a dust collector suitable for an exhaust gas cooling tower that cools an exhaust gas containing dust, and to an exhaust gas cooling tower provided with the dust collector.
[0002]
[Prior art]
In various plants, an exhaust gas cooling tower is sometimes used to cool high-temperature exhaust gas containing dust.
The exhaust gas cooling tower performs water injection near the inlet for introducing the high temperature exhaust gas, and makes the spray cooling water and the high temperature exhaust gas come into gas-liquid contact. The temperature-reduced exhaust gas descends in the exhaust gas cooling tower, is discharged from the lower side, and is sent to, for example, a downstream dust collector. Part of the dust in the exhaust gas collects on the floor of the exhaust gas cooling tower.
[0003]
A dust scraper is provided at the bottom of the ash gas cooling tower, and discharges dust accumulated on the bottom from a dust discharge port provided on the floor.
The dust scraper includes a scraper mounting frame, a scraper, and a drive mechanism.
The scraper mounting frame is a structure that rotates at the center of the floor surface. A scraper is attached to the scraper mounting frame with its longitudinal direction horizontal. As the scraper mounting frame rotates, the scraper sweeps away dust accumulated at the bottom. The dust is swept away by a scraper and discharged from the dust discharge port to the outside. A double damper is provided at the dust outlet to cut out the discharged dust.
[0004]
Depending on the properties of the dust and the amount of water to be sprayed, the adhesion of the dust increases, and the dust tends to adhere to the bottom surface and the inner wall surface.
As dust adherence increases, the scraper receives great resistance from the dust, and a large force is required to rotate the scraper.
If the dust adhering to the bottom surface or the inner wall surface becomes hard, the force required to rotate the scraper further increases, and the drive mechanism that drives the scraper may stop.
[0005]
[Non-Patent Document 1]
Ishikawa Yasuaki, “Practical Design of Fluidized-bed Waste Incinerator”, Augmented Revised Edition, Japan, Industrial Publishing Company, August 20, 1994, page 134, Fig. 3.7-1
[0006]
[Problems to be solved by the invention]
Therefore, even if the stickiness of the dust accumulated in the exhaust gas treatment tower such as the exhaust gas cooling tower is increased, the dust collector capable of reliably discharging the dust with less power and the exhaust gas equipped with the dust collector A cooling tower was requested.
[0007]
The present invention has been devised in view of the above-mentioned problems, and replaces the conventional exhaust gas cooling tower for cooling exhaust gas containing dust, and is capable of reliably discharging dust with less power. To provide an exhaust gas cooling tower equipped with a duster and its dust collector.
[0008]
[Mechanism for solving the problem]
In order to achieve the above-mentioned object, an exhaust gas cooling tower for cooling exhaust gas containing dust according to the present invention has a bottom surface provided with a discharge port for discharging dust and an inner wall surface rising upward from the bottom surface. A duster having a main body, a scraper mounting frame that is attached to the bottom surface and rotates around a vertical axis, a scraper that is a member attached to the scraper mounting frame, and a drive mechanism that rotates the scraper mounting frame. The scraper is attached to the scraper mounting frame and is a scraper frame which is a longitudinal member having a longitudinal direction along the horizontal direction, and a plurality of plates which are supported by the scraper frame and sweep the dust accumulated on the bottom surface with an edge facing downward. And with slats.
[0009]
According to the configuration of the present invention, the cooling tower body has a bottom surface provided with a discharge port for discharging dust, and an inner wall surface rising upward from the bottom surface, and a scraper mounting frame is mounted on the bottom surface around the vertical axis. The scraper is mounted on the scraper mounting frame, the drive mechanism rotates the scraper mounting frame, the scraper frame is mounted on the scraper mounting frame and is a longitudinal member having a longitudinal direction along the horizontal direction, and a plurality of blades Since the plate is supported by the scraper frame and sweeps the dust accumulated on the bottom surface with the edge facing downward, the scraper mounting frame rotates, the scraper frame moves above the bottom surface, and a plurality of supported scraper frames are supported. The slats sweep away dust accumulated on the bottom surface, and exhaust gas dust accumulated on the bottom surface is exhausted. Asked wear to the mouth.
[0010]
Further, in the exhaust gas cooling tower according to the present invention, a plurality of the blade plates are arranged at a predetermined angle in the longitudinal direction of the scraper frame, with the surfaces intersecting the moving direction of the scraper frame at a predetermined angle. It is preferable.
With the configuration of the present invention described above, the plurality of blades arranged at predetermined intervals in the longitudinal direction cross the surface at a predetermined angle in the direction in which the scraper frame moves, so that each blade has dust. The resistance force to sweep is small, the resistance torque acting on the scraper frame is small, and the scraper mounting frame can rotate with a small torque.
[0011]
Further, in the exhaust gas cooling tower according to the present invention, each of the blades sweeps a floor region that is a belt-like region of the floor surface as the scraper mounting frame rotates, and the floor regions overlap each other to form the floor. It is preferable that the surface is substantially covered.
According to the configuration of the present invention, the floor regions overlap each other and substantially cover the floor surface, so that the dust accumulated on the bottom surface can be swept by moving the plurality of blades.
[0012]
Further, in the exhaust gas cooling tower according to the present invention, when the pitch circle whose center is the vertical axis and the arc extends over the discharge port is assumed, each time the scraper mounting frame rotates, the vane plate collects dust in the pitch circle. It is preferable to sweep toward the arc.
According to the configuration of the present invention, the blades sweep the dust toward the arc of the pitch circle every time the scraper mounting frame rotates, so that the dust collects on the arc of the pitch circle and is sequentially discharged from the discharge port. Is done.
[0013]
Furthermore, in the exhaust gas cooling tower according to the present invention, it is preferable that the edge facing the lower side of the blade plate is made of a series of concave and convex portions.
According to the configuration of the present invention, the edge facing downward of the slat is made of a series of recesses and projections, so the resistance to sweep dust in the recesses is smaller than the resistance to sweep dust in the projections. The resistance force of the individual blades to sweep dust is smaller, the resistance torque acting on the scraper frame is smaller, and the scraper mounting frame can rotate with less torque.
[0014]
Furthermore, the exhaust gas cooling tower according to the present invention preferably has a scratching claw that is a plate that the scraper is supported by the scraper frame and scratches dust adhering to the inner wall surface with an edge facing the inner wall surface.
With the configuration of the present invention, the scratching claw is supported by the scraper frame and scratches the dust adhering to the inner wall surface with the edge facing the inner wall surface, so that the dust adhering to the inner wall surface collapses and falls to the bottom surface, Sequentially discharged from the outlet.
[0015]
Further, in the exhaust gas cooling tower according to the present invention, the scraper has a plurality of scratching claws which are plates supported by the scraper frame and scratching dust adhering to the inner wall surface with an edge facing the inner wall surface, It is preferable that the scratching nails are arranged vertically with a predetermined interval.
According to the configuration of the present invention, since the plurality of scratching nails are arranged at predetermined intervals in the upper and lower directions, the resistance force of the individual scratching nails to scratch the dust is small, the resistance torque acting on the scraper frame is small, and the scraper The mounting frame can rotate with less torque.
[0016]
Furthermore, in the exhaust gas cooling tower according to the present invention, it is preferable that the scratching claws face the surface up and down.
According to the configuration of the present invention, since the surface of the scratching claw is directed vertically, the resistance force of the dust acting on the surface of the scratching nail is small, the resistance torque acting on the scraper frame is small, and the scraper mounting frame has a small torque Can be rotated with.
[0017]
Further, in the exhaust gas cooling tower according to the present invention, it is preferable that each scratching claw scratches an inner wall region that is a band-like region of the inner wall surface as the scraper mounting frame rotates, and the inner wall regions do not overlap each other. .
According to the configuration of the present invention, since the inner wall regions do not overlap each other, the scraping claw scrapes off dust adhering to the inner wall region as the scraper mounting frame rotates, and the remaining dust falls by its own weight. The dust adhering to the inner wall surface can be scraped off with low power.
[0018]
In order to achieve the above object, dust accumulated in an exhaust gas treatment tower having a bottom surface provided with a discharge port for discharging dust according to the present invention and an inner wall surface rising upward from the bottom surface is scraped to the discharge port. A scraper mounting frame that is attached to the bottom surface and rotates about a vertical axis; a scraper that is a member attached to the scraper mounting frame; and a drive mechanism that rotates the scraper mounting frame. A scraper frame that is a scraper frame that is attached to the scraper mounting frame and that is a longitudinal member whose longitudinal direction is parallel to the horizontal direction, and a plurality of blades that are supported by the scraper frame and sweep the dust accumulated on the bottom surface with an edge facing downward And with.
[0019]
According to the configuration of the present invention, the scraper mounting frame is mounted on the bottom surface and rotates about the vertical axis, the scraper is mounted on the scraper mounting frame, the drive mechanism rotates the scraper mounting frame, and the scraper frame is mounted on the scraper frame. It is a longitudinal member that is attached to the frame and has a longitudinal direction along the horizontal direction, and a plurality of blades are supported by the scraper frame and sweeps the dust accumulated on the bottom surface with the edge facing downward, so that the scraper attachment frame rotates. The scraper frame moves on the upper surface of the bottom surface, the plurality of blades supported by the scraper frame sweeps the dust accumulated on the bottom surface, and the exhaust gas dust accumulated on the bottom surface is attracted to the discharge port.
[0020]
Further, in the dust scraper according to the present invention, a plurality of the blade plates are arranged at a predetermined interval in the longitudinal direction of the scraper frame, with the surfaces intersecting the moving direction of the scraper frame at a predetermined angle. Is preferred.
With the configuration of the present invention described above, the plurality of blades arranged at predetermined intervals in the longitudinal direction cross the surface at a predetermined angle in the direction in which the scraper frame moves, so that each blade has dust. The sweeping force is small, the resistance torque acting on the scraper frame is small, and the scraper mounting frame can rotate with a small torque.
[0021]
Furthermore, in the dust scraper according to the present invention, each of the blades sweeps a floor region that is a band-like region of the floor surface as the scraper mounting frame rotates, and the floor regions overlap each other to form the floor. It is preferable that the surface is substantially covered.
According to the configuration of the present invention, the floor regions overlap each other and substantially cover the floor surface, so that the dust accumulated on the bottom surface can be swept by moving a plurality of blades.
[0022]
Furthermore, in the dust scraper according to the present invention, when the pitch circle whose center is the vertical axis and the circular arc extends over the discharge port is assumed, each time the scraper mounting frame rotates, the blades remove the dust into the pitch circle. It is preferable to sweep toward the arc.
According to the configuration of the present invention, the blades sweep the dust toward the arc of the pitch circle every time the scraper mounting frame rotates, so that the dust collects on the arc of the pitch circle and is sequentially discharged from the discharge port. Is done.
[0023]
Furthermore, in the dust scraper according to the present invention, it is preferable that the edge facing the lower side of the vane plate is made of a series of concave and convex portions.
According to the configuration of the present invention, the edge facing downward of the slat is made of a series of recesses and projections, so the resistance to sweep dust in the recesses is smaller than the resistance to sweep dust in the projections. The individual blades sweep less dust, the resistance torque acting on the scraper frame is smaller, and the scraper mounting frame can rotate with less torque.
[0024]
Furthermore, it is preferable that the dust scraper according to the present invention has a scraping nail which is a plate in which the scraper is supported by the scraper frame and scratches the dust attached to the inner wall surface with an edge facing the inner wall surface.
According to the configuration of the present invention, the scratching claw scratches the dust attached to the inner wall surface supported by the scraper frame at the edge facing the inner wall surface, so that the dust attached to the inner wall surface collapses and falls to the bottom surface, sequentially. It is discharged from the outlet.
[0025]
Furthermore, the dust scraper according to the present invention has a plurality of scraping claws which are plates that scrape the dust attached to the inner wall surface supported by the scraper frame at the edge facing the inner wall surface, It is preferable that the nail | claws are arrange | positioned at predetermined intervals up and down.
According to the configuration of the present invention, since the plurality of scratching nails are arranged at predetermined intervals in the upper and lower directions, the resistance force of the individual scratching nails to scratch the dust is small, the resistance torque acting on the scraper frame is small, and the scraper The mounting frame can rotate with less torque.
[0026]
Furthermore, in the dust scraper according to the present invention, it is preferable that the scraper has its surface directed up and down.
According to the configuration of the present invention, since the surface of the scratching claw is directed vertically, the resistance force of the dust acting on the surface of the scratching nail is small, the resistance torque acting on the scraper frame is small, and the scraper mounting frame has a small torque Can be rotated with.
[0027]
Furthermore, in the dust scraper according to the present invention, it is preferable that each scraping claw scratches an inner wall region which is a belt-like region of the inner wall surface as the scraper mounting frame rotates, and the inner wall regions do not overlap each other.
According to the configuration of the present invention, the inner wall regions do not overlap each other, so that the scratching claw scrapes off dust adhering to the inner wall region of the inner wall surface as the scraper mounting frame rotates, and the remaining dust falls by its own weight. Therefore, the dust adhering to the inner wall surface can be scraped off with less power.
[0028]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In each figure, common portions are denoted by the same reference numerals, and redundant description is omitted.
[0029]
An exhaust gas cooling tower according to an embodiment of the present invention will be described. FIG. 1 is an overall front view of an exhaust gas cooling tower according to an embodiment of the present invention. FIG. 2 is a partial front view of the exhaust gas cooling tower according to the embodiment of the present invention. FIG. 3 is a plan sectional view of the exhaust gas cooling tower according to the embodiment of the present invention. FIG. 4 is a partial detailed view 1 of an exhaust gas cooling tower according to an embodiment of the present invention. FIG. 5 is a partial detail view 2 of the exhaust gas cooling tower according to the embodiment of the present invention. FIG. 6 is a partial detailed view 3 of the exhaust gas cooling tower according to the embodiment of the present invention.
[0030]
The exhaust gas cooling tower 1 is a device that cools the exhaust gas G containing dust, and includes a cooling tower body 2, a water spray device 3, a dust collector 4, and a dust discharge mechanism 5.
The cooling tower body 2 is a device having a circular bottom surface F provided with a discharge port M for discharging dust, and an inner wall surface H rising upward from the bottom surface. With a fireproof structure.
The normal cooling tower body 2 is a cylindrical structure standing vertically, and is provided with an exhaust gas inlet at the upper part and an exhaust gas outlet at the lower side surface.
[0031]
The water spray device 3 is a device that sprays water into the cooling tower body 2.
The water spray device 3 includes a plurality of nozzles penetrating the side wall at the upper part of the side wall of the cooling tower body 2 and directing the injection port inside.
The exhaust gas enters from the exhaust gas inlet, is cooled by direct contact with water sprayed by the water spray device 3, descends inside the cooling tower body 2, and exits from the exhaust gas outlet. At that time, dust in the exhaust gas accumulates on the bottom surface of the cooling tower body 2.
[0032]
The dust scraper 4 is a device that scrapes dust accumulated on the bottom surface F of the cooling tower body 2 and collects it at the discharge port M.
The dust scraper 4 rotates around the vertical axis, sweeps over the bottom surface F, and collects dust at the discharge port M.
The dust is scraped by the dust scraper 4 and falls down from the discharge port M.
[0033]
The dust discharge mechanism 5 is a device that cuts out dust that has fallen into the discharge port M. The dust discharge device 5 is a double damper, for example, and periodically discharges dust.
[0034]
Next, the structure of the dust scraper 4 will be described in detail.
The dust scraper 4 includes a scraper mounting frame 10, a scraper 20, and a drive mechanism 30.
The scraper mounting frame 10 has a structure that is mounted on the center portion of the bottom surface F and rotates around a vertical axis. A rotational drive shaft of a drive mechanism 30 to be described later is attached to the center portion of the bottom surface F with the rotational shaft vertical, and the scraper mounting frame 10 is fixed to the rotational drive shaft and rotates.
A conical umbrella-like structure is provided on the upper part of the scraper mounting frame 10. The cone bus is tilted beyond the angle of repose of the dust.
A flange for fixing a scraper 20 described later is provided on a side surface of the scraper mounting frame 10.
FIG. 3 shows four scrapers 20 attached to the scraper mounting frame 10.
[0035]
The scraper 20 is supported by the scraper mounting frame 10 and rotates to sweep the dust on the floor surface F. The scraper 20 includes a scraper frame 21, a plurality of blade plates 22, a plurality of scratching claws 23, and a blade plate support 24. The
The scraper frame 21 is a longitudinal member whose one end is attached to the scraper mounting frame 10 and whose longitudinal direction is along the horizontal direction.
2 and 3 show four scraper frames 21 attached to the flanges of the scraper mounting frame 10, respectively. The scraper frame 21 is manufactured by welding steel plates, and has a shape in which a plate whose surface is set up vertically is bent into a rectangle when viewed from above.
[0036]
The vane plate 22 is a plate that is supported by the scraper frame 21 and sweeps dust accumulated on the bottom surface F with an edge facing downward.
An edge facing the lower side of the vane plate is formed by a series of concave portions a and convex portions b.
FIG. 5 shows a slat 22 whose lower edge is formed by a series of rectangular recesses a and rectangular projections b and whose upper part is supported by a scraper frame 21.
A plurality of blades 22 are arranged with their surfaces intersecting at a predetermined angle in the direction in which the scraper frame moves, and at predetermined intervals in the radial direction. That is, when the reference line in the longitudinal direction of the scraper frame intersects the vertical axis of rotation of the scraper mounting frame, the surfaces of the plurality of blade plates 22 are at a predetermined angle (for example, 5 degrees) in the direction perpendicular to the reference line of the scraper frame. Intersect at 30 degrees).
Furthermore, the lower part of the side edge of the slat 22 arranged on the outermost periphery is made of a series of concave parts a and convex parts b.
In FIG. 4, the lower edge is made up of a series of rectangular recesses a and rectangular projections b, the side edge is made up of a series of triangular depressions a and triangular projections b, and the upper part is a scraper. A blade 22 supported by the frame 21 is shown.
[0037]
When a pitch circle L having an arc centering on the vertical axis and straddling the discharge port M is imagined, the blade 24 sweeps dust toward the arc of the pitch circle L every time the scraper mounting frame 10 rotates.
In FIG. 7, a state in which the blade 22 sweeps dust in the direction of the arc of the pitch circle L is indicated by a white arrow.
Each of the blades 22 sweeps the floor surface F in a band shape as the scraper mounting frame 10 rotates. The belt-like region of the floor surface F is temporarily called a floor region D. The floor regions F of the blades 22 of the scrapers 20 overlap each other and cover almost the entire floor surface F. “Almost the whole” means that the central portion of the floor surface is excluded.
In FIG. 3, four scrapers 20 are evenly arranged on the circumference of the scraper mounting frame 10, and a plurality of blades 22 are arranged in the radial direction of each scraper frame 21 at different intervals for each scraper 20. It is shown. Accordingly, each blade 22 sweeps the bottom surface F in a band shape, and the band-shaped regions overlap with each other while having an overlapping portion, thereby covering the bottom surface F as a whole.
[0038]
The scratching claw 23 is a plate that is supported by the scraper frame 21 and scratches dust adhering to the inner wall surface H with an edge facing the inner wall surface.
The scratching claw 23 is fixed to the scraper frame 21 with its surface facing up and down.
FIG. 6 shows three scratching claws 23 fixed to the scraper frame 21 with bolts.
The scraper claw 23 supported by each scraper frame 21 scratches the inner wall surface H in a band shape as the scraper mounting frame 10 rotates. This belt-like region is temporarily called an inner wall region E. It is preferable that the inner wall regions E of the scratching claws 23 for each scraper do not overlap.
For example, the three scratching claws 23 shown in FIG. 6 are set as one set, and four sets of the scratching claws 23 are fixed to the four scraper frames at different height positions.
[0039]
The blade support 24 is a member that fixes an intermediate portion of the blade 22 and fixes the blade 22.
[0040]
The drive mechanism 30 is a device that rotationally drives the scraper mounting frame 10.
The drive mechanism 30 has a rotating shaft whose axis is vertical and power for rotating the rotating shaft.
The rotation shaft projects to the center of the bottom surface F and supports the scraper mounting frame 10.
[0041]
Next, the operation of the exhaust gas cooling tower and its dust collector will be described.
FIG. 7 is an operation explanatory view of the dust scraper according to the embodiment of the present invention.
Hot exhaust gas G enters the exhaust gas cooling tower body 2 from the exhaust gas inlet. The exhaust gas G directly contacts the water sprayed by the water injection device 3 while descending the interior of the exhaust gas cooling tower body 2, lowers the temperature, and exits from the exhaust gas exhaust port.
Dust in the exhaust gas G adheres to the inner side surface H and falls on the bottom surface F. The dust falling on the scraper mounting frame 10 slides on the umbrella-like structure and falls on the floor surface F.
The drive mechanism 30 rotates the scraper mounting frame 10 around the vertical axis.
The scraper 20 rotates on the floor surface F around the rotation axis.
The lower edge of the slat 22 sweeps away dust accumulated on the bottom surface F. The dust is swept by the blade plate 22 and moves in the direction of the arc of the pitch line L while moving in the direction of rotation about the rotation axis. The dust sequentially enters the discharge port M while being swept by the plurality of blades 22.
Dust adheres to the inner wall surface H.
The scratching claw 23 scrapes off dust adhering to the inner wall region E of the inner wall surface H.
When the plurality of scratching claws 23 write down the dust in the inner wall region E, the dust that adheres to the inner wall surface H and remains in a strip shape collapses by its own weight.
The fallen dust is swept to the lower edge of the slat 22 and attracted to the discharge port M.
After a certain amount of dust has accumulated in the discharge port M, the dust is cut out by the dust discharge mechanism 5.
[0042]
If the dust scraper of the above-mentioned embodiment and the exhaust gas cooling tower provided with this dust scraper are used, the dust accumulated on the bottom surface can be scraped with a small amount of power.
Further, since the plurality of blade plates are arranged so as to intersect at a predetermined angle in the direction in which the scraper frame moves, the resistance of dust acting on the blade plates is small, and a large amount of dust can be scraped with little power.
In addition, since the floor areas to which the respective blades are gathered overlap each other and substantially cover the floor surface, the dust on the floor surface can be scraped with a little power.
In addition, since the dust is scraped in the direction of the arc of the pitch circle while each blade is moving, the dust can be efficiently guided to the discharge port.
In addition, since the lower edge of the slats is made of a series of concave and convex parts, there is little resistance applied to the slats and less power is required to rotate the scraper.
Moreover, since the scratching claw is provided for scratching the side wall, dust adhering to the side wall can be scraped off.
Further, since the scratching claw is facing upward and the inner wall region where the scratching claw scratches does not overlap, the resistance force acting on the entire scratching claw is small, and the power for rotating the scraper is small.
[0043]
The present invention is not limited to the embodiments described above, and various modifications can be made without departing from the scope of the invention.
Although the dust scraper has been described by taking the water direct contact type exhaust gas cooling tower as an example, the present invention is not limited to this and can be applied to other exhaust gas treatment towers.
Although the bottom surface of the exhaust gas cooling tower has been described as being circular, the present invention is not limited to this, and for example, a spectacle type in which a circle having a bottom surface of 2 partially overlaps may be used.
[0044]
【The invention's effect】
As described above, the exhaust gas cooling tower and the dust collector according to the present invention have the following effects due to their configurations.
Since the scraper frame is provided with a plurality of blades that sweep dust, the scraper frame attached to the scraper mounting frame rotates on the top of the bottom surface, and the dust that the blades supported by the scraper frame accumulate on the bottom surface. The dust of the exhaust gas that has been swept up and accumulated on the bottom is attracted to the outlet.
Further, since the plurality of blades are arranged with a predetermined angle in the direction in which the scraper frame moves and at a predetermined interval in the longitudinal direction, each blade has a resistance to sweeping dust. The resistance torque acting on the scraper frame is small, and the scraper mounting frame can rotate with a small torque.
Further, since the floor regions overlap each other and almost cover the floor surface, dust accumulated on the bottom surface can be swept.
Further, each time the scraper mounting frame rotates, the blades sweep the dust toward the arc of the pitch circle, so that the dust collects on the arc of the pitch circle and is sequentially discharged from the discharge port.
Further, since the edge facing downward of the vane plate is formed by a series of concave and convex portions, the resistance force of each vane plate to sweep dust is smaller, the resistance torque acting on the scraper frame is smaller, and the scraper The mounting frame can rotate with less torque.
Further, since the scratching claw scratches the dust attached to the inner wall surface supported by the scraper frame with the edge facing the inner wall surface, the dust attached to the inner wall surface collapses and falls to the bottom surface and is sequentially discharged from the discharge port. .
In addition, since the scratching claw is arranged at a predetermined interval in the vertical direction, the resistance of each scratching claw to scratch the dust is small, the resistance torque acting on the scraper frame is small, and the scraper mounting frame rotates with a small torque. it can.
Further, since the surface of the scratching claw is directed vertically, the resistance force of dust acting on the surface of the scratching plate is small, the resistance torque acting on the scraper frame is small, and the scraper mounting frame can rotate with a small torque.
In addition, since the inner wall regions do not overlap each other, the scraper claw scrapes off the dust adhering to the inner wall region of the inner wall surface as the scraper mounting frame rotates, and the remaining dust falls by its own weight, so it is possible to use less power. Dust adhering to the inner wall surface can be scraped off.
Therefore, it is possible to provide a dust collector that can reliably discharge dust with less power and an exhaust gas cooling tower that includes the dust collector.
[0045]
[Brief description of the drawings]
FIG. 1 is an overall front view of an exhaust gas cooling tower according to an embodiment of the present invention.
FIG. 2 is a partial front view of an exhaust gas cooling tower according to an embodiment of the present invention.
FIG. 3 is a plan sectional view of the exhaust gas cooling tower according to the embodiment of the present invention.
FIG. 4 is a partial detail view 1 of an exhaust gas cooling tower according to an embodiment of the present invention.
FIG. 5 is a partial detail view 2 of the exhaust gas cooling tower according to the embodiment of the present invention.
FIG. 6 is a partial detail view 3 of the exhaust gas cooling tower according to the embodiment of the present invention.
FIG. 7 is an operation explanatory diagram of the dust scraper according to the embodiment of the present invention.
[Explanation of symbols]
a Concave b Convex D Floor area E Inner wall area F Floor G Exhaust gas H Inner wall surface W Water 1 Exhaust gas cooling tower 2 Exhaust gas cooling tower body 3 Water injection device 4 Dust scraper 5 Dust discharge mechanism 10 Scraper mounting frame 20 Scraper 21 Scraper Frame 22 Blade plate 23 Shaving claw 24 Blade plate support 30 Drive mechanism

Claims

An exhaust gas cooling tower that cools exhaust gas containing dust,
A cooling tower body having a bottom surface provided with a discharge port for discharging dust and an inner wall surface rising upward from the bottom surface;
A dust scraper having a scraper mounting frame attached to the bottom surface and rotating around a vertical axis; a scraper which is a member attached to the scraper mounting frame; and a drive mechanism for rotating the scraper mounting frame;
With
The scraper is attached to the scraper mounting frame and is a scraper frame that is a longitudinal member whose longitudinal direction is parallel to the horizontal direction, and a plurality of plates that are supported by the scraper frame and sweep the dust accumulated on the bottom surface with a downward facing edge. Hold the slats,
The scraper frame has a shape in which a plate with its surface set vertically is bent into a rectangle when viewed from above,
A plurality of the blade plates intersecting the surface in the moving direction of the scraper frame at a predetermined angle and arranged at predetermined intervals in the longitudinal direction of the scraper frame, and the upper portion is supported by the scraper frame;
An exhaust gas cooling tower characterized by that.

The scraper has a blade support that is a member for fixing an intermediate portion of the blade.
The exhaust gas cooling tower according to claim 1.

An exhaust gas cooling tower that cools exhaust gas containing dust,
A cooling tower body having a bottom surface provided with a discharge port for discharging dust and an inner wall surface rising upward from the bottom surface;
A dust scraper having a scraper mounting frame attached to the bottom surface and rotating around a vertical axis; a scraper which is a member attached to the scraper mounting frame; and a drive mechanism for rotating the scraper mounting frame;
With
The scraper is attached to the scraper mounting frame and is a scraper frame that is a longitudinal member whose longitudinal direction is parallel to the horizontal direction, and a plurality of plates that are supported by the scraper frame and sweep the dust accumulated on the bottom surface with a downward facing edge. Hold the slats,
The edge facing the bottom of the slats arranged on the outermost periphery is made of a series of rectangular concave parts and rectangular convex parts, and the side edge is made of a series of triangular concave parts and triangular convex parts,
An exhaust gas cooling tower characterized by that.

An exhaust gas cooling tower that cools exhaust gas containing dust,
A cooling tower body having a bottom surface provided with a discharge port for discharging dust and an inner wall surface rising upward from the bottom surface;
A dust scraper having a scraper mounting frame that is attached to the bottom surface and rotates about a vertical axis, a plurality of scrapers that are members attached to the scraper mounting frame, and a drive mechanism that rotates the scraper mounting frame;
With
The scraper is attached to the scraper mounting frame and is a scraper frame that is a longitudinal member whose longitudinal direction is parallel to the horizontal direction, and a plurality of plates that are supported by the scraper frame and sweep the dust accumulated on the bottom surface with a downward facing edge. Hold the slats,
The scraper is supported by the scraper frame and has a scratching claw that is a plate that scratches dust adhering to the inner wall surface with an edge facing the inner wall surface,
The scratching nails are fixed to the scraper frames at different heights,
An exhaust gas cooling tower characterized by that.

An exhaust gas cooling tower that cools exhaust gas containing dust,
A cooling tower body having a bottom surface provided with a discharge port for discharging dust and an inner wall surface rising upward from the bottom surface;
A dust scraper having a scraper mounting frame that is attached to the bottom surface and rotates about a vertical axis, a plurality of scrapers that are members attached to the scraper mounting frame, and a drive mechanism that rotates the scraper mounting frame;
With
The scraper is attached to the scraper mounting frame and is a scraper frame that is a longitudinal member whose longitudinal direction is parallel to the horizontal direction, and a plurality of plates that are supported by the scraper frame and sweep the dust accumulated on the bottom surface with a downward facing edge. Hold the slats,
The scraper is supported by the scraper frame and has a scratching claw that is a plate that scratches dust adhering to the inner wall surface with an edge facing the inner wall surface,
Each of the scratching claws scratches the inner wall region, which is a band-like region of the inner wall surface, as the scraper mounting frame rotates.
The inner wall regions of each of the plurality of scrapers for each scraper do not overlap,
An exhaust gas cooling tower characterized by that.

A dust scraper that scrapes dust accumulated in an exhaust gas treatment tower having a bottom surface provided with a discharge port for discharging dust and an inner wall surface rising upward from the bottom surface to the discharge port,
A scraper mounting frame attached to the bottom surface and rotating about a vertical axis;
A scraper which is a member attached to the scraper mounting frame;
A drive mechanism for rotating the scraper mounting frame;
With
The scraper is attached to the scraper mounting frame and is a scraper frame that is a longitudinal member whose longitudinal direction is parallel to the horizontal direction, and a plurality of plates that are supported by the scraper frame and sweep the dust accumulated on the bottom surface with a downward facing edge. Hold the slats,
The scraper frame has a shape in which a plate with its surface set vertically is bent into a rectangle when viewed from above,
A plurality of the blade plates intersecting the surface in the moving direction of the scraper frame at a predetermined angle and arranged at predetermined intervals in the longitudinal direction of the scraper frame, and the upper portion is supported by the scraper frame;
A dust collector characterized by that.

The scraper has a blade support that is a member for fixing an intermediate portion of the blade.
The dust scraper according to claim 6 .

A dust scraper that scrapes dust accumulated in an exhaust gas treatment tower having a bottom surface provided with a discharge port for discharging dust and an inner wall surface rising upward from the bottom surface to the discharge port,
A scraper mounting frame attached to the bottom surface and rotating about a vertical axis;
A scraper which is a member attached to the scraper mounting frame;
A drive mechanism for rotating the scraper mounting frame;
With
The scraper is attached to the scraper mounting frame and is a scraper frame that is a longitudinal member whose longitudinal direction is parallel to the horizontal direction, and a plurality of plates that are supported by the scraper frame and sweep the dust accumulated on the bottom surface with a downward facing edge. Hold the slats,
The edge facing the bottom of the slats arranged on the outermost periphery is made of a series of rectangular concave parts and rectangular convex parts, and the side edge is made of a series of triangular concave parts and triangular convex parts,
A dust collector characterized by that.

A dust scraper that scrapes dust accumulated in an exhaust gas treatment tower having a bottom surface provided with a discharge port for discharging dust and an inner wall surface rising upward from the bottom surface to the discharge port,
A scraper mounting frame attached to the bottom surface and rotating about a vertical axis;
A plurality of scrapers which are members attached to the scraper mounting frame;
A drive mechanism for rotating the scraper mounting frame;
With
The scraper is attached to the scraper mounting frame and is a scraper frame that is a longitudinal member whose longitudinal direction is parallel to the horizontal direction, and a plurality of plates that are supported by the scraper frame and sweep the dust accumulated on the bottom surface with a downward facing edge. Hold the slats,
The scraper is supported by the scraper frame and has a scratching claw that is a plate that scratches dust adhering to the inner wall surface with an edge facing the inner wall surface,
The nail is fixed to the scraper frames at different heights,
A dust collector characterized by that.

A dust scraper that scrapes dust accumulated in an exhaust gas treatment tower having a bottom surface provided with a discharge port for discharging dust and an inner wall surface rising upward from the bottom surface to the discharge port,
A scraper mounting frame attached to the bottom surface and rotating about a vertical axis;
A plurality of scrapers which are members attached to the scraper mounting frame;
A drive mechanism for rotating the scraper mounting frame;
With
The scraper is attached to the scraper mounting frame and is a scraper frame that is a longitudinal member whose longitudinal direction is parallel to the horizontal direction, and a plurality of plates that are supported by the scraper frame and sweep the dust accumulated on the bottom surface with a downward facing edge. Hold the slats,
The scraper is supported by the scraper frame and has a scratching claw that is a plate that scratches dust adhering to the inner wall surface with an edge facing the inner wall surface,
Each of the scratching claws scratches the inner wall region, which is a band-like region of the inner wall surface, as the scraper mounting frame rotates.
The inner wall regions of each of the plurality of scrapers for each scraper do not overlap,
A dust collector characterized by that.