JPH0748796A - Dryer hood unit of papermaking machine - Google Patents
Dryer hood unit of papermaking machineInfo
- Publication number
- JPH0748796A JPH0748796A JP19597993A JP19597993A JPH0748796A JP H0748796 A JPH0748796 A JP H0748796A JP 19597993 A JP19597993 A JP 19597993A JP 19597993 A JP19597993 A JP 19597993A JP H0748796 A JPH0748796 A JP H0748796A
- Authority
- JP
- Japan
- Prior art keywords
- air
- ceiling
- hood
- papermaking machine
- dryer
- 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.)
- Withdrawn
Links
Landscapes
- Drying Of Solid Materials (AREA)
- Paper (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は製紙機械のドライヤフー
ド装置に関するのである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dryer hood device for a papermaking machine.
【０００２】[0002]
【従来の技術】図３は従来の一般的な製紙機械のドライ
ヤフード周辺図であり、１は湿紙（図示せず）の水分を
蒸発させる為のドライヤロール、２は同じく湿紙を拘束
乾燥させる為のロール、３は湿紙を搬送する為のカンバ
ス、４はカンバス搬送用ロール、５は湿紙より蒸発した
水分を除去する為に、ロール２に対して高温低湿度の空
気を供給するベンチレーションダクトである。また６は
通常用いられているフードの天井部であり、この天井部
６は２重天井構造として形成されている。この様なフー
ドにおいて、湿紙から蒸発した水分は、前記のベンチレ
ーションダクト５から供給された高温低湿度空気、また
カンバスを乾燥させる為に設置された図示しないカンバ
スロールから供給される高温低湿度空気、更にフード全
体の換気の為に同目的で設置してあるメークアップダク
ト（図示せず）から供給される空気により、天井部に設
けた排気口から、これらの空気と共に系外へ排気され
る。この天井部分から排気される空気は、湿紙からの蒸
発水分を多量に含んでいる為、湿度が高く、例えば絶対
湿度で０．１４〜０．１５kgＨ2 Ｏ／kgDry Air 、露点
温度で５８〜５９℃程度である。この時の排気空気流を
図４、図５に示す。また図４は図３中のＢ〜Ｂ断面図を
示しており、フード全体の空気の流れは図４，５中に矢
印で示す様になると考えられる。2. Description of the Related Art FIG. 3 is a peripheral view of a dryer hood of a conventional general papermaking machine, wherein 1 is a dryer roll for evaporating the moisture of a wet paper (not shown), and 2 is a restraining dryer for the wet paper. Rolls for making 3 rolls for transporting wet paper, 4 for rolls for transporting canvas, and 5 for supplying water of high temperature and low humidity to the roll 2 in order to remove water evaporated from the wet paper. It is a ventilation duct. Further, 6 is a ceiling portion of a hood that is normally used, and this ceiling portion 6 is formed as a double ceiling structure. In such a hood, the water evaporated from the wet paper is the high temperature and low humidity air supplied from the ventilation duct 5 and the high temperature and low humidity supplied from the canvas roll (not shown) installed to dry the canvas. Air and the air supplied from a make-up duct (not shown) installed for the same purpose to ventilate the entire hood are exhausted to the outside of the system from the exhaust port provided in the ceiling. It The air exhausted from the ceiling portion has a high humidity because it contains a large amount of water vaporized from the wet paper. For example, absolute humidity is 0.14 to 0.15 kgH 2 O / kgDry Air and dew point temperature is 58 to It is about 59 ° C. The exhaust air flow at this time is shown in FIGS. Further, FIG. 4 shows a cross-sectional view taken along line BB in FIG. 3, and it is considered that the air flow in the entire hood is as shown by arrows in FIGS.
【０００３】次に図６にフードの２重天井部を示す。通
常この２重天井部は、図６に示す様に天井側面に適当な
ピッチで引き戸７が配置されており、この引き戸７は開
閉が出来る様になっている。高湿度の排気空気は引き戸
が開いている部分を通して系外へ排除されている。この
様な状況のもとでの排気空気流中には、図４，図５に示
す様に２重天井の下部に高湿度空気のよどみ域が発生す
る懸念がある。このよどみ域の発生は、２重天井部６下
面の表面温度と、滞っている高湿度空気の有する水蒸気
分圧の如何によっては、天井部下面に結露発生という問
題を引き起こす。また結露が発生すると、図３のＢ〜Ｂ
断面で示す部分では、直接湿紙面に水滴が落下し、表面
性状に悪影響を及ぼす懸念がある。さらに図３のＡ〜Ａ
断面の部分でもカンバス３に水滴が落下し、水が跳ねる
など操業上好ましくない。一方、現在市場ニーズとして
フード内部の高露点化が排気風量の低減による省エネの
観点から指向されている。このため排風量の低減によ
り、系内を流れる空気の流速が更に低下し、上述の天井
下部でのよどみ域の発生に拍車がかかって結露し易い傾
向となっている。以上のことから現在、天井部下部にお
ける結露現象に対する対策が急務となっている。Next, FIG. 6 shows a double ceiling portion of the hood. Normally, in this double ceiling portion, as shown in FIG. 6, sliding doors 7 are arranged on the side surface of the ceiling at an appropriate pitch, and this sliding door 7 can be opened and closed. Exhaust air with high humidity is excluded from the system through the part where the sliding door is open. In the exhaust air flow under such a situation, there is a concern that a stagnation area of high-humidity air may be generated under the double ceiling as shown in FIGS. The occurrence of this stagnation region causes a problem that dew condensation occurs on the lower surface of the ceiling portion 6 depending on the surface temperature of the lower surface of the double ceiling portion 6 and the partial pressure of water vapor of the stagnant high-humidity air. When dew condensation occurs, BB in FIG.
At the portion shown by the cross section, water drops may drop directly on the wet paper surface, which may adversely affect the surface properties. Furthermore, A to A of FIG.
Even in the cross section, water drops fall on the canvas 3 and the water splashes, which is not preferable in operation. On the other hand, a current market need is to raise the dew point inside the hood from the viewpoint of energy saving by reducing the exhaust air volume. Therefore, due to the reduction in the amount of exhausted air, the flow velocity of the air flowing through the system further decreases, and the occurrence of the stagnation area in the lower portion of the ceiling is spurred, and dew condensation tends to occur easily. From the above, currently, there is an urgent need to take measures against the dew condensation phenomenon in the lower part of the ceiling.
【０００４】[0004]
【発明が解決しようとする課題】前述した如く従来の場
合は、天井下部において結露発生の懸念があり、この傾
向は市場ニーズであるフード内の高露点化に際し、流速
の絶対値が現象することにより、更に助長される欠点が
あった。本発明は前記従来のような結露の懸念をとり除
き、湿紙、カンバスに悪影響を与えない高露点のドライ
ヤフードを提供しようとするものである。As described above, in the conventional case, there is a concern that dew condensation may occur in the lower part of the ceiling, and this tendency is that the absolute value of the flow velocity is a phenomenon when the dew point in the hood, which is a market need, is increased. However, there is a drawback that it is further promoted. The present invention is intended to provide a dryer hood having a high dew point that does not adversely affect wet paper and canvas by eliminating the above-mentioned concern about dew condensation.
【０００５】[0005]
【課題を解決するための手段】このため本発明は、製紙
機械のドライヤパート上部のドライヤフード設備であっ
て、同フードの天井部下面略中央部に、同下面外表面に
沿って流れる空気層を形成する空気吹出手段を設けたこ
とを特徴とするもので、これを課題解決のための手段と
するものである。Therefore, the present invention provides a dryer hood equipment at the upper part of a dryer part of a papermaking machine, wherein an air layer flowing along the outer surface of the lower surface of the hood is approximately at the center of the lower surface of the ceiling. It is characterized in that an air blowing means for forming the above is provided, and this is used as means for solving the problem.
【０００６】[0006]
【作用】本発明では、天井下部に高温空気（軽い空気）
を供給する吹出口を設け、天井下面近傍にフィルム状の
空気流れを形成する。即ち、天井下部に吐出された空気
は軽い為、天井下部と高温湿り空気の管に薄いホットフ
ィルムを形成して天井下面をなめる様に流れ、滞ってい
る湿り空気を同伴して両サイドへ流れる。こうして湿り
空気のよどみ域をなくし、結露を防止する。In the present invention, high temperature air (light air) is placed under the ceiling.
Is provided to supply a film-like air flow near the lower surface of the ceiling. That is, since the air discharged to the lower part of the ceiling is light, a thin hot film is formed in the lower part of the ceiling and the tube of high-temperature moist air to flow like licking the lower surface of the ceiling, and the stagnant moist air is carried along and flows to both sides. . In this way, the stagnation area of moist air is eliminated and dew condensation is prevented.
【０００７】[0007]
【実施例】以下本発明を図面の実施例について説明する
と、図１及び図２は本発明の実施例を示し、図１はフー
ドの天井部分の断面図で、ここでは従来の２重天井を対
象としたものを示している。図中８は高温低湿度空気を
供給し、高湿度排気とを区分けするための仕切り、９は
高温低湿度空気をフード内に供給する吹出手段としての
吹出口、１０は吹き出された当該空気を幅方向に流す為
の１例としてのガイド板である。前記吹出口９は、幅方
向への設置個数やマシン流れ方向への設置個数、ピッ
チ、更に吹出口の形状、寸法などを自由に設計変更でき
るものであり、またガイド１０についても、その設置に
より、おおよそ左右に均等に吹出して空気の流れを広げ
ることが出来れば、形状、材質等を特に限定するもので
はない。但し、ガイド１０については、その設置により
ガイド本体に結露が生じないよう、例えばヒータを埋め
込む、或いは断熱用のペイントを塗布するなどの対策を
施しておく。図２は本発明に係る第２実施例である。こ
の第２実施例も図１の第１実施例と同様に天井下部に吹
出口を設けるものであるが、中央部に空気吹出手段とし
ての吹出口１１を対で設けた点及びガイド板を配置しな
い点で、第１実施例と相違している。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings. FIG. 1 and FIG. 2 show an embodiment of the present invention. FIG. 1 is a sectional view of a ceiling portion of a hood. The target is shown. In the figure, 8 is a partition for supplying high-temperature and low-humidity air to separate it from high-humidity exhaust, 9 is an outlet as a blowing means for supplying high-temperature and low-humidity air into the hood, and 10 is the blown air. It is a guide plate as an example for flowing in the width direction. The number of the outlets 9 to be installed in the width direction, the number to be installed in the machine flow direction, the pitch, and the shape and size of the outlets can be freely changed, and the guide 10 can also be changed depending on the installation. The shape, material, etc. are not particularly limited as long as they can be blown out substantially evenly to the left and right to widen the air flow. However, with respect to the guide 10, measures such as embedding a heater or applying paint for heat insulation are taken in order to prevent dew condensation on the guide body due to its installation. FIG. 2 shows a second embodiment according to the present invention. In the second embodiment as well, as in the first embodiment shown in FIG. 1, an air outlet is provided in the lower portion of the ceiling, but a point provided with a pair of air outlets 11 as air blowing means and a guide plate are arranged in the central portion. This is different from the first embodiment in that it is not performed.
【０００８】図１，図２において吹出口からフード内に
吐出された高温の低湿度空気は、図１の場合はガイド１
０により左右に広がり、また図２の場合は１対のノズル
１１により第１実施例の場合と同じく左右に広がる。こ
の広がった高温低湿度の空気は比重が小さい為、図１，
図２のいづれの場合も天井下面にホットフィルムを形成
しつつ矢印で示す様に天井下面を左右に流れていく。こ
の作用によって、従来天井下部に滞っている高湿度の空
気は、天井下部に接触することなく、同上の吹出し空気
に同伴されて排出口１２へと導かれていく。こうして両
実施例のいづれの場合も天井下面での結露が防止され
る。なお、当該吹出口より供給される高温低湿度空気に
ついては、前述したベンチレーションダクトに供する空
気の１部を使用することで対応できる。また２重天井部
での当該空気と排気の高湿度空気の仕切り、或いはそれ
に付随するダクトワーク（図示せず）等については、上
述のような機能を奏するものであればどのような形態の
ものでもよく、敢えてその方法を指定するものではな
い。In FIG. 1 and FIG. 2, the high temperature and low humidity air discharged into the hood from the air outlet is the guide 1 in the case of FIG.
0 spreads to the left and right, and in the case of FIG. 2, a pair of nozzles 11 spreads to the left and right as in the case of the first embodiment. This spread high temperature and low humidity air has a small specific gravity, so
In either case of FIG. 2, the hot film is formed on the lower surface of the ceiling and flows left and right on the lower surface of the ceiling as shown by the arrow. By this action, the high-humidity air that has conventionally stagnated in the lower portion of the ceiling is guided to the outlet 12 by being entrained by the blown air of the same without contacting the lower portion of the ceiling. In this way, in both cases, dew condensation on the lower surface of the ceiling is prevented. The high temperature and low humidity air supplied from the air outlet can be dealt with by using a part of the air supplied to the ventilation duct described above. In addition, as for the partition of the air and the high-humidity air of the exhaust in the double ceiling, or the duct work (not shown) accompanying it, any form can be used as long as it has the above-mentioned function. But well, it doesn't intentionally specify the method.
【０００９】[0009]
【発明の効果】以上詳細に説明した如く本発明によれ
ば、懸念される天井下部での結露を防止することがで
き、更に市場ニーズである高露点フードが達成でき、排
気ファン動力低減に伴う省エネが図れる等の優れた効果
を奏するものである。As described above in detail, according to the present invention, it is possible to prevent the dew condensation in the lower part of the ceiling which is a concern, and to achieve the high dew point hood which is a market need, and to reduce the exhaust fan power. It has excellent effects such as energy saving.
【図１】本発明の第１実施例に係る天井部の断面図であ
る。FIG. 1 is a sectional view of a ceiling portion according to a first embodiment of the present invention.
【図２】本発明の第２実施例に係る天井部の断面図であ
る。FIG. 2 is a sectional view of a ceiling portion according to a second embodiment of the present invention.
【図３】従来の製紙機械ドライヤフードの概念図であ
る。FIG. 3 is a conceptual diagram of a conventional papermaking machine dryer hood.
【図４】図３のＡ〜Ａ断面図である。FIG. 4 is a sectional view taken along line AA of FIG.
【図５】図３のＢ〜Ｂ断面図である。5 is a sectional view taken along line BB of FIG.
【図６】従来の２重天井を示す概念図である。FIG. 6 is a conceptual diagram showing a conventional double ceiling.
９ 吹出口 １０ ガイド板 １１ 吹出口 9 Air outlet 10 Guide plate 11 Air outlet
Claims (1)
ヤフード設備であって、同フードの天井部下面略中央部
に、同下面外表面に沿って流れる空気層を形成する空気
吹出手段を設けたことを特徴とする製紙機械のドライヤ
フード装置。1. A dryer hood facility at an upper part of a dryer part of a papermaking machine, wherein an air blowing means for forming an air layer flowing along an outer surface of the lower surface is provided at a substantially central portion of a lower surface of a ceiling portion of the hood. A dryer hood device for paper manufacturing machines.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19597993A JPH0748796A (en) | 1993-08-06 | 1993-08-06 | Dryer hood unit of papermaking machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19597993A JPH0748796A (en) | 1993-08-06 | 1993-08-06 | Dryer hood unit of papermaking machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0748796A true JPH0748796A (en) | 1995-02-21 |
Family
ID=16350192
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19597993A Withdrawn JPH0748796A (en) | 1993-08-06 | 1993-08-06 | Dryer hood unit of papermaking machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0748796A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1069368C (en) * | 1995-05-12 | 2001-08-08 | 造纸科技学会股份有限公司 | Method and apparatus for drying fiber web at elevated ambient pressures |
| CN1084414C (en) * | 1996-03-18 | 2002-05-08 | 造纸科学技术所股份有限公司 | Method and apparatus for drying fiber web at elvated ambient pressures |
-
1993
- 1993-08-06 JP JP19597993A patent/JPH0748796A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1069368C (en) * | 1995-05-12 | 2001-08-08 | 造纸科技学会股份有限公司 | Method and apparatus for drying fiber web at elevated ambient pressures |
| CN1084414C (en) * | 1996-03-18 | 2002-05-08 | 造纸科学技术所股份有限公司 | Method and apparatus for drying fiber web at elvated ambient pressures |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20001031 |