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JP5193173B2 - Lining method of reaction tower - Google Patents
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JP5193173B2 - Lining method of reaction tower - Google Patents

Lining method of reaction tower Download PDF

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JP5193173B2
JP5193173B2 JP2009287339A JP2009287339A JP5193173B2 JP 5193173 B2 JP5193173 B2 JP 5193173B2 JP 2009287339 A JP2009287339 A JP 2009287339A JP 2009287339 A JP2009287339 A JP 2009287339A JP 5193173 B2 JP5193173 B2 JP 5193173B2
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reaction tower
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JP2011126576A (en
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一十士 篠原
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本発明は、パルプの漂白に使用される晒塔その他の流体よう反応塔に関する。   The present invention relates to a bleaching tower or other fluid reaction tower used for bleaching pulp.

晒塔を用いるパルプの漂白行程では、漂白剤として塩素が使用されてきた。しかしながら、近年、公害防止の関係で、従来漂白剤として使用されてきた塩素の使用が禁止され、代わりに腐食性の強い二酸化塩素等を使用し、液温も70°C以上で漂白を行わなければならなくなったので、晒塔の内部材質を変更する必要が生じている。即ち、漂白剤として塩素を使用した従来の反応塔は、内面に磁器タイルのライニングを設けることで十分使用に耐えていたが、二酸化塩素を使用することになると、腐食性が強いので、従来の磁器タイルでは短時間で使用できなくなるという問題が生じる。   In the bleaching process of pulp using a bleaching tower, chlorine has been used as a bleaching agent. However, in recent years, the use of chlorine, which has been used as a bleaching agent, has been banned for pollution prevention. Instead, corrosive chlorine dioxide or the like must be used, and bleaching must be performed at a liquid temperature of 70 ° C or higher. Since it has become necessary, the internal material of the bleaching tower needs to be changed. That is, the conventional reaction tower using chlorine as a bleaching agent was sufficiently used by providing a porcelain tile lining on the inner surface. However, when chlorine dioxide is used, it is highly corrosive. There is a problem that porcelain tiles cannot be used in a short time.

そこで、従来の磁器タイルに代えて、チタン又はステンレス等の耐食性金属板を溶接によりつなぎ合わせることによって晒塔本体の内面にライニングすることが行われ、これによって反応塔の内面の早期腐食は改良された。   Therefore, instead of conventional porcelain tiles, it is possible to line the inner surface of the bleaching tower body by joining corrosion resistant metal plates such as titanium or stainless steel by welding, thereby improving the early corrosion of the inner surface of the reaction tower. It was.

しかしながら、従来の耐食性金属板によるライニング方法は、矩形状に形成された耐食性金属板を平板状のままで溶接によりつなぎ合わせてライニング層を形成するものであることから、そのライニング層が熱膨張するときに、ライニング層の一部が内向きに膨出変形することがあり、また反応塔の内部を真空状態で洗浄するようなときに反応塔内の真空度が高くなると、ライニング層が吸引された状態となって破壊するといった問題が生じている。   However, in the conventional lining method using a corrosion-resistant metal plate, the corrosion-resistant metal plates formed in a rectangular shape are joined together by welding in the form of a flat plate, so that the lining layer is thermally expanded. Sometimes, a part of the lining layer bulges inwardly, and when the inside of the reaction tower is cleaned in a vacuum state, the lining layer is sucked if the degree of vacuum in the reaction tower becomes high. There is a problem that it breaks down and breaks down.

本発明は、上記の事情に鑑み、耐食性金属板によるライニング層が熱膨張したときに、その一部が内向きに膨出変形したり、反応塔内部を真空にしたときにライニング層が破壊することがないようにした反応塔のライニング方法を提供することを目的としている。   In the present invention, in view of the above circumstances, when a lining layer made of a corrosion-resistant metal plate is thermally expanded, a part of the lining layer bulges inwardly, or the lining layer is destroyed when the inside of the reaction tower is evacuated. It is an object of the present invention to provide a method for lining a reaction tower so as to prevent this from happening.

上記課題を解決するための手段を、後述する実施形態の参照符号を付して説明すると、請求項1に係る発明は、反応塔本体1の内周面に、所定の厚さと幅を有する耐食性金属板からなる横帯板11を、上下方向一定間隔おきに固着すると共に、上下に隣り合う帯板11,11間に同様な縦帯板12を左右方向一定間隔おきに固着し、上下に隣り合う横帯板11,11と左右に隣り合う縦帯板12,12とによって区画形成されるセグメント13に対応する矩形状に形成された耐食性金属板からなるライニング板2で、一つの横辺部側と一つの縦辺部側とが屈曲部6,8を介して夫々凸段部7,9を所定幅で形成してなるライニング板2を、各セグメント13内に配置して、非凸段部側縦横辺部7o,9oの側縁部を縦横帯板11,12の側縁部に溶接すると共に、縦横の凸段部7,9は対応する縦横の帯板11,12上に夫々載せ掛け、この載せ掛けたライニング板2の縦横凸段部7,9には、夫々隣り合う他のライニング板2の非凸段部側の縦辺部及び横辺部を夫々内側に挟み込んで、これら縦横凸段部7,9の外周縁に沿って他のライニング板2の非凸段部側縦横辺部7o,9oに対し溶接し、これを全てのセグメント13に亘って行うことにより耐食性ライニング層3を形成するようにしたことを特徴とするグ方法。   Means for solving the above problems will be described with reference numerals of the embodiments described later. The invention according to claim 1 is a corrosion resistance having a predetermined thickness and width on the inner peripheral surface of the reaction tower body 1. The horizontal strips 11 made of metal plates are fixed at regular intervals in the vertical direction, and the same vertical strips 12 are fixed at regular intervals in the horizontal direction between the vertical strips 11 adjacent to each other. A lining plate 2 made of a corrosion-resistant metal plate formed in a rectangular shape corresponding to a segment 13 formed by a matching horizontal strip plate 11, 11 and a vertical strip plate 12, 12 adjacent to the left and right. A lining plate 2 in which convex side portions 7 and 9 are formed with a predetermined width on the side and one vertical side portion side through bent portions 6 and 8, respectively, is disposed in each segment 13 to form a non-convex step The side edges of the vertical and horizontal sides 7o and 9o are the side edges of the vertical and horizontal strips 11 and 12. And the vertical and horizontal convex steps 7 and 9 are respectively placed on the corresponding vertical and horizontal strips 11 and 12, and the vertical and horizontal convex steps 7 and 9 of the lining plate 2 are adjacent to each other. Non-convex step portions of the other lining plate 2 along the outer peripheral edges of the vertical and horizontal convex step portions 7 and 9 by sandwiching the vertical side portion and the horizontal side portion of the other lining plate 2 on the inner side, respectively. A gauging method characterized in that the corrosion-resistant lining layer 3 is formed by welding the side vertical and horizontal sides 7o and 9o over all the segments 13.

請求項2は、請求項1に記載の反応塔のライニング方法において、各ライニング板2は、横辺部側凸段部7が上辺側に位置するようにセグメント13内に配置するようにしたことを特徴とする。   Claim 2 is the lining method of the reaction tower according to claim 1, wherein each lining plate 2 is arranged in the segment 13 so that the lateral side convex portion 7 is located on the upper side. It is characterized by.

請求項3は、請求項1に記載の反応塔のライニング方法において、ライニング板2及び縦横の帯板11,12は、チタン又はステンレスからなることを特徴とする。   According to a third aspect of the present invention, in the lining method for a reaction tower according to the first aspect, the lining plate 2 and the vertical and horizontal strips 11 and 12 are made of titanium or stainless steel.

上記解決手段による発明の効果を、後述する実施形態の参照符号を付して説明すると、請求項1に係る発明のライニング方法によれば、ライニング層3が熱膨張するときは、その伸びをライニング板2の屈曲部6,8が吸収するから、ライニング層3の一部が内向きに膨出変形するようなことがなくなり、またライニング板2の屈曲部6,8が補強リブを形成すると共に、ライニング板2の一部が縦横の帯板11,12に溶接されていることから、ライニング層3自体の機械的強度及び反応塔本体1に対するライニング層3の取付強度が増大し、反応塔本体1の内部が真空状態となっても、ライニング層3が破壊するようなことがなくなる。   The effect of the invention by the above solution will be described with reference numerals of the embodiments described later. According to the lining method of the invention according to claim 1, when the lining layer 3 is thermally expanded, the elongation is lined. Since the bent portions 6 and 8 of the plate 2 absorb, a part of the lining layer 3 is prevented from bulging and deforming inward, and the bent portions 6 and 8 of the lining plate 2 form reinforcing ribs. Since a part of the lining plate 2 is welded to the vertical and horizontal strips 11 and 12, the mechanical strength of the lining layer 3 itself and the attachment strength of the lining layer 3 to the reaction tower main body 1 are increased, and the reaction tower main body Even if the inside of 1 is in a vacuum state, the lining layer 3 is not destroyed.

請求項2に係る発明のライニング方法によれば、横辺部側凸段部7が上辺側に位置するようにセグメント内に各ライニング板2を配置する場合は、下段側ライニング板2の上辺側凸段部7を、上段側ライニング板2の非凸段部側横辺部7oである下辺部に上から被せるようにすればよいから、ライニング作業及び溶接作業が容易となる。   According to the lining method of the invention according to claim 2, when each lining plate 2 is arranged in the segment so that the lateral side convex step 7 is positioned on the upper side, the upper side of the lower side lining plate 2 Since it is sufficient that the convex step portion 7 is placed on the lower side portion which is the non-convex step side lateral side portion 7o of the upper step side lining plate 2, the lining operation and the welding operation are facilitated.

請求項3に係る発明のように、ライニング板2及び縦横の帯板11,12がチタン又はステンレスからなる場合は、ライニング層3の耐食性が非常に優れたものとなる。   When the lining plate 2 and the longitudinal and lateral strips 11 and 12 are made of titanium or stainless steel as in the invention according to claim 3, the corrosion resistance of the lining layer 3 is very excellent.

本発明の一実施形態による晒塔の縦断面図である。It is a longitudinal cross-sectional view of the bleaching tower by one Embodiment of this invention. (a) は晒塔のライニング層の内面を平面状に展開した状態の図面で、(b) は(a) のA−A線断面図、(c) は(a) のB−B線断面図、(d) は(a) のC−C線断面図である。(a) is a drawing in which the inner surface of the lining layer of the bleaching tower is flattened, (b) is a sectional view taken along line AA in (a), and (c) is a sectional view taken along line BB in (a). FIG. 4D is a cross-sectional view taken along the line CC of FIG. (a) は反応塔本体の内周面に縦横帯板を固着した状態の平面状展開図、(b) は(a) のD−D線断面図、(c) は(a) のE−E線断面図である。(a) is a development plan view in a state where vertical and horizontal strips are fixed to the inner peripheral surface of the reaction tower body, (b) is a sectional view taken along the line DD of (a), and (c) is an E--line of (a). It is E line sectional drawing. (a) は帯板を溶接によって反応塔本体の内周面に固着した場合の拡大縦断面図、(b) は帯板をボルトナットによって反応塔本体の内周面に固着した場合の拡大縦断面図、(c) は帯板をアンカーボルトによって反応塔本体の内周面に固着した場合の拡大縦断面図である。(a) is an enlarged longitudinal sectional view when the strip is fixed to the inner peripheral surface of the reaction tower main body by welding, (b) is an enlarged longitudinal section when the strip is fixed to the inner peripheral surface of the reaction tower main body by bolts and nuts. FIG. 4C is an enlarged longitudinal sectional view when the strip is fixed to the inner peripheral surface of the reaction tower main body with anchor bolts. 本発明に係るライニング板を示す斜視図である。It is a perspective view which shows the lining board which concerns on this invention. 本発明に係るライニング板によってライニングする状態の斜視図である。It is a perspective view of the state lined with the lining board concerning the present invention. (a) は図2の矢印Fで示す部分の拡大図、(b) は図2の矢印Gで示す部分の拡大図である。(a) is an enlarged view of a portion indicated by an arrow F in FIG. 2, and (b) is an enlarged view of a portion indicated by an arrow G in FIG. (a) は図6のH−H線拡大断面図、(b) は図6のI−I線拡大断面図である。(a) is the HH line expanded sectional view of FIG. 6, (b) is the II sectional expanded view of FIG.

以下に本発明の好適な一実施形態を図面に基づいて説明すると、図1に示す反応塔の一例としてのパルプ用晒塔は、鉄板又はコンクリートからなる晒塔本体(反応塔本体)1を有し、この晒塔本体1の内周面にチタン又はステンレスからなるライニング板2によるライニング層3が形成されている。図示は省略するが、反応塔本体1の外周面には外装材が形成されている。   A preferred embodiment of the present invention will be described below with reference to the drawings. A bleaching tower for pulp as an example of a reaction tower shown in FIG. 1 has a bleaching tower body (reaction tower body) 1 made of an iron plate or concrete. A lining layer 3 made of a lining plate 2 made of titanium or stainless steel is formed on the inner peripheral surface of the bleaching tower body 1. Although not shown, an exterior material is formed on the outer peripheral surface of the reaction tower body 1.

晒塔本体1の下端部には、ベース4が一体に設けられ、このベース4は、外径が晒塔本体1の外径より大きく形成された中空構造となっている。また図示は省略するが、ベース4の内部にはスラリー状のパルプを供給する供給配管が配設される。晒塔本体1の底部をなす下端部内面5は、テーパ状ないし球面状となっており、その中央部に開口部Oが設けられている。   A base 4 is integrally provided at the lower end of the bleaching tower body 1, and the base 4 has a hollow structure in which an outer diameter is formed larger than an outer diameter of the bleaching tower body 1. Although not shown, a supply pipe for supplying slurry-like pulp is disposed inside the base 4. The inner surface 5 of the lower end portion that forms the bottom of the bleaching tower body 1 is tapered or spherical, and an opening O is provided at the center thereof.

次に、ライニング板2によってライニング層3を形成するライニング方法について説明する。なお、晒塔本体1の内径は例えば約5300mm、外径は例えば約5600mm、高さは例えば約20000mmとする。ライニング板2は、例えば、厚さが3mm、横の長さが4300mm、縦の長さが1500mmのチタン又はステンレスからなる横長矩形状のもので、図5に示すように、一つの横辺部側と一つの縦辺部側とに屈曲部6,8を介して夫々所定幅の凸段部7,9を形成しており、また凸段部7を形成した横辺部と凸段部9を形成した縦辺部とのコーナー部は更に一段高いコーナー凸段部10を形成している。このライニング板2において、凸段部7,9を形成していない側の横辺部及び縦辺部を図5に示すように非凸段部側縦横辺部7o,9oとする。   Next, a lining method for forming the lining layer 3 with the lining plate 2 will be described. The inner diameter of the bleaching tower body 1 is about 5300 mm, the outer diameter is about 5600 mm, and the height is about 20000 mm, for example. The lining plate 2 is, for example, a horizontally long rectangular shape made of titanium or stainless steel having a thickness of 3 mm, a horizontal length of 4300 mm, and a vertical length of 1500 mm, as shown in FIG. Convex stepped portions 7 and 9 having a predetermined width are formed on the side and one vertical side portion via bent portions 6 and 8, respectively. The corner portion with the vertical side portion where the ridges are formed forms a corner convex step portion 10 that is one step higher. In the lining plate 2, the horizontal side portion and the vertical side portion on the side where the convex step portions 7 and 9 are not formed are defined as non-convex step portion side vertical and horizontal side portions 7 o and 9 o as shown in FIG. 5.

上記ライニング板2によって晒塔本体(反応塔本体)1をライニングする前に、晒塔本体1の内周面には、図3に示すように、厚さが例えば4mm、幅が例えば30mmの夫々チタン又はステンレスからなる横帯板11及び縦帯板12のうちの先ず横帯板11を、上下方向に例えば1470mmの間隔をおいて固着し、そして上下に隣り合う横帯板11,11間には縦帯板12を左右方向に例えば3800mmの間隔をおいて固着することによって、晒塔本体1の内周面全域にわたり、上下に隣り合う横帯板11,11と左右に隣り合う縦帯板12,12との間にセグメント13を区画形成する。ライニング板2は、このセグメント13の形状にほぼ対応する矩形状である。   Prior to lining the bleaching tower body (reaction tower body) 1 with the lining plate 2, the inner peripheral surface of the bleaching tower body 1 has a thickness of, for example, 4 mm and a width of, for example, 30 mm, as shown in FIG. First, of the horizontal band plate 11 and the vertical band plate 12 made of titanium or stainless steel, the horizontal band plate 11 is fixed in the vertical direction with an interval of, for example, 1470 mm, and between the horizontal band plates 11, 11 adjacent in the vertical direction. The vertical strips 12 are fixed in the left-right direction at an interval of, for example, 3800 mm, so that the vertical strips adjacent to the horizontal strips 11, 11 vertically adjacent to each other over the entire inner peripheral surface of the bleaching tower body 1 are left and right. A segment 13 is defined between the two. The lining plate 2 has a rectangular shape substantially corresponding to the shape of the segment 13.

上記横帯板11及び縦帯板12を晒塔本体1の内周面に固着するには、縦横の帯板11,12がステンレスで、晒塔本体1が鉄の場合は、図4の(a) に示すように、帯板11,12に孔14を複数箇所開けて、各孔14より溶接Wを施して帯板11,12を反応塔本体1に固着する。また、帯板11,12がチタンで、晒塔本体1が鉄やレンガなどチタン以外の材質からなる場合は、溶接ができないため、図4の(b) に示すように、帯板11,12に孔14を複数箇所開けると共に、晒塔本体1にも対応する箇所に孔15を開けて、晒塔本体1側の孔15から挿入したチタン製のボルト16の先端部を帯板11,12側の孔14に突入させて、その孔14より溶接Wを施してボルト16を帯板11,12に一体結合し、ボルト16の基端部にチタン製のナット17を螺合して締め付けることにより、帯板11,12を晒塔本体1に固着する。   In order to fix the horizontal strip 11 and the vertical strip 12 to the inner peripheral surface of the bleaching tower main body 1, when the vertical and horizontal strips 11 and 12 are stainless steel and the bleaching tower main body 1 is iron, As shown in a), a plurality of holes 14 are formed in the strips 11 and 12, and welding W is applied from the holes 14 to fix the strips 11 and 12 to the reaction tower body 1. In addition, when the strips 11 and 12 are titanium and the bleaching tower main body 1 is made of a material other than titanium such as iron or brick, welding cannot be performed. Therefore, as shown in FIG. In addition, a plurality of holes 14 are formed in the hole, and holes 15 are formed at positions corresponding to the bleaching tower main body 1. The bolt 16 is integrally connected to the strips 11 and 12, and a titanium nut 17 is screwed to the base end portion of the bolt 16 and tightened. Thus, the strips 11 and 12 are fixed to the bleaching tower body 1.

また、晒塔本体1が図4の(c) に示すようにコンクリートの場合は、帯板11,12に孔14を複数箇所開けると共に、晒塔本体1にはその対応する箇所にアンカーボルト18を打ち込んで、このアンカーボルト18先端部を帯板11,12側の孔14に突入させ、その孔14より溶接Wを施して帯板11,12をアンカーボルト18に結合することによって、帯板11,12を反応塔本体1に固着する。この場合、帯板11,12がチタンであれば、アンカーボルト18もチタンを使用し、帯板11,12がステンレスの場合は、アンカーボルト18はステンレス又は鋼製のものを使用する。   When the bleaching tower main body 1 is concrete as shown in FIG. 4 (c), a plurality of holes 14 are opened in the strips 11 and 12, and the bleaching tower main body 1 has anchor bolts 18 at corresponding positions. , The end of the anchor bolt 18 is inserted into the hole 14 on the side of the strips 11 and 12, and welding W is applied from the hole 14 to join the strips 11 and 12 to the anchor bolt 18. 11 and 12 are fixed to the reaction tower body 1. In this case, if the strips 11 and 12 are titanium, the anchor bolt 18 is also titanium, and if the strips 11 and 12 are stainless, the anchor bolt 18 is made of stainless steel or steel.

上記のようにして縦横の帯板11,12を晒塔本体1の内周面に固着し、図3の(a) に示すような状態としたならば、上段側のセグメント13より順次ライニング板2を配置して、このライニング板2の非凸段部側縦横辺部7o,9oの側縁部7oo,9ooを隣接する縦横帯板11,12の側縁部に溶接する(図7〜図8に溶接部をWで示す)と共に、縦横の凸段部7,9は、図7の(b) に示すように、対応する縦横の帯板11,12上に夫々載せ掛け、この載せ掛けたライニング板2の縦横凸段部7,9には、夫々隣り合う他のライニング板2の非凸段部側縦辺部9o及び横辺部7oを夫々内側に挟み込んで、これら縦横凸段部7,9が他のライニング板2の非凸段部側縦横辺部7o,9oに覆い被さった状態でこれら縦横凸段部7,9の外周縁に沿って他のライニング板2の非凸段部側縦横辺部7o,9oに対し溶接し(溶接部をWで示す)、しかしてこれを全てのセグメント13に亘って行うことにより、図2に示すような耐食性ライニング層3を形成する。   When the vertical and horizontal strips 11 and 12 are fixed to the inner peripheral surface of the bleaching tower main body 1 as described above, and the state shown in FIG. 2 and the side edge portions 7oo, 9oo of the non-convex stepped portion side vertical side portions 7o, 9o of the lining plate 2 are welded to the side edge portions of the adjacent vertical and horizontal strip plates 11, 12 (FIGS. 7 to 7). 8, the vertical and horizontal convex steps 7 and 9 are respectively placed on the corresponding vertical and horizontal strips 11 and 12, as shown in FIG. 7 (b). The vertical and horizontal convex step portions 7 and 9 of the lining plate 2 sandwich the non-convex step portion side vertical side portion 9o and the horizontal side portion 7o of the other adjacent lining plates 2 inside, respectively. 7 and 9 are covered with the non-convex stepped portion side vertical and horizontal side portions 7o and 9o of the other lining plate 2, and the vertical and horizontal convex stepped portions 7 and 9 By welding to the non-convex stepped portion side vertical and horizontal side portions 7o, 9o of the other lining plate 2 along the peripheral edge (the welded portion is indicated by W), this is performed over all the segments 13, so that FIG. A corrosion-resistant lining layer 3 as shown in FIG.

なお、各ライニング板2の凸段部7を形成した横辺部と凸段部9を形成した縦辺部とのコーナー部にある一段高いコーナー凸段部10は、図8の(b) に示すように、隣り合う他のライニング板2の横辺部側凸段部7の端部を覆う状態となり、このコーナー凸段部10の側縁部は他のライニング板2の凸段部7に溶接される。また、図6では、図示が煩雑となるため、ライニング板2の溶接箇所を省略しているが、各ライニング板2の周縁部は、隣り合う他のライニング板2ないし帯板11,12に対して隙間なく溶接されている。   In addition, the one step higher corner convex portion 10 at the corner portion between the horizontal side portion where the convex step portion 7 of each lining plate 2 is formed and the vertical side portion where the convex step portion 9 is formed is shown in FIG. As shown, the side edges of the side ridges 7 of the other adjacent lining plates 2 are covered, and the side edges of the corner ridges 10 are formed on the ridges 7 of the other lining plates 2. Welded. Further, in FIG. 6, since the illustration is complicated, the welded portion of the lining plate 2 is omitted, but the peripheral portion of each lining plate 2 is relative to other adjacent lining plates 2 or strips 11 and 12. And welded without gaps.

また、上記のような耐食性ライニング層3を形成するライニング方法において、各ライニング板2は、図6から分かるように横辺部側凸段部7が上辺側に位置するようにセグメント内に配置する場合は、下段側ライニング板2の上辺側凸段部7を、上段側ライニング板2の非凸段部側横辺部7oである下辺部に上から被せるようにすればよいから、ライニング作業及び溶接作業が容易となる。   Further, in the lining method for forming the corrosion-resistant lining layer 3 as described above, each lining plate 2 is disposed in the segment so that the lateral side convex steps 7 are located on the upper side as can be seen from FIG. In this case, the upper side convex step 7 of the lower lining plate 2 may be covered from above on the lower side which is the non-convex step side lateral side 7o of the upper lining plate 2. Welding work becomes easy.

上記のようにして耐蝕性ライニング層3を形成した晒塔本体1は、図1に示すように上端部が開口部20となっており、また晒塔本体1の上部には、開口部20から溢れ出るパルプを受ける受け皿部21が一体に設けてある。この受け皿部21は、晒塔本体1の外周に沿って設けられた周壁21aと一方に傾斜する底面21bとを有するリング状の溝状凹部として形成されており、その最も低い底面部に排出口22が設けてある。尚、排出口22には排出ノズル23が取り付けられ、この排出ノズル23に排出配管P2が接続される。   The bleaching tower body 1 having the corrosion-resistant lining layer 3 formed as described above has an opening 20 at the upper end as shown in FIG. A tray portion 21 for receiving the overflowing pulp is integrally provided. The tray portion 21 is formed as a ring-shaped groove-shaped recess having a peripheral wall 21a provided along the outer periphery of the bleaching tower body 1 and a bottom surface 21b inclined to one side. 22 is provided. A discharge nozzle 23 is attached to the discharge port 22, and a discharge pipe P <b> 2 is connected to the discharge nozzle 23.

また図1に示すように、晒塔本体1の受け皿部21の上側はキャップ24よって覆蓋されている。このキャップ24の中心部には回転軸25が挿通され、この回転軸25に撹拌具26が取り付けてある。撹拌具26は、放射状に設けられた半径方向に延びる複数のアーム26aの下側に救うの撹拌翼26bを設けたもので、これら撹拌翼26bの隙間からパルプが受け皿21部内に流出するようになっている。回転軸25の上端部にはモータ26及び減速機27が設けられている。   As shown in FIG. 1, the upper side of the tray portion 21 of the bleaching tower body 1 is covered with a cap 24. A rotating shaft 25 is inserted through the center of the cap 24, and a stirring tool 26 is attached to the rotating shaft 25. The stirrer 26 is provided with relief stirrer blades 26b below a plurality of radially extending arms 26a provided so that the pulp flows out into the tray 21 through the gaps between the stirrer blades 26b. It has become. A motor 26 and a speed reducer 27 are provided at the upper end of the rotating shaft 25.

この晒塔1を用いてパルプの漂白を行う場合は、反応塔本体(晒塔本体)1の下端側の供給口28に接続した供給配管P1から原料のパルプを晒塔本体1内に供給する。パルプはスラリー状で、供給配管P1の途中で漂白剤である二酸化塩素が添加される。このパルプは晒塔本体1内を徐々に上昇して、その間に漂白され、上端部の開口部20から溢れ出るが、このとき回転している撹拌具26によって撹拌されると共に、掻き出される。開口部20から流出したパルプは受け皿部21内に受けられ、この受け皿部21傾斜底面21bに沿って排出口22側へ流動して、排出ノズル23から排出配管P2を通って所定の場所へ送られるようになっている。   When the bleaching tower 1 is used to bleach the pulp, the raw material pulp is supplied into the bleaching tower body 1 from the supply pipe P1 connected to the supply port 28 on the lower end side of the reaction tower body (bleaching tower body) 1. . The pulp is in the form of a slurry, and chlorine dioxide as a bleaching agent is added in the middle of the supply pipe P1. The pulp gradually rises in the bleaching tower body 1 and is bleached during that time, and overflows from the opening 20 at the upper end. At this time, the pulp is stirred by the rotating stirrer 26 and scraped out. The pulp that has flowed out of the opening 20 is received in the tray 21 and flows to the discharge port 22 side along the tilted bottom surface 21b of the tray 21 and is sent from the discharge nozzle 23 to the predetermined place through the discharge pipe P2. It is supposed to be.

以上説明したような本発明に係るライニング方法によって形成される晒塔1によれば、ライニング層3が熱膨張するときは、その伸びをライニング板2の屈曲部6,8が吸収することによって、ライニング層3の一部が内向きに膨出変形するようなことがなくなる。またこの晒塔1では、ライニング板2の屈曲部6,8が補強リブを形成していると共に、ライニング板2の非凸段部側縦横辺部7o,9oが縦横の帯板11,12に溶接され且つ横辺部側凸段部7及び縦辺部側凸段部9が他のライニング板2の非凸段部側縦横辺部7o,9oに覆い被さった状態で溶接されているから、ライニング層3自体の機械的強度及び晒塔本体1に対するライニング層3の取付強度が増大し、晒塔本体1の内部が真空状態となっても、ライニング層3が破壊するようなことがなくなる。   According to the bleaching tower 1 formed by the lining method according to the present invention as described above, when the lining layer 3 is thermally expanded, the bending portions 6 and 8 of the lining plate 2 absorb the elongation, A part of the lining layer 3 does not bulge inwardly. Further, in this bleaching tower 1, the bent portions 6 and 8 of the lining plate 2 form reinforcing ribs, and the non-convex step side vertical and horizontal sides 7 o and 9 o of the lining plate 2 are formed into vertical and horizontal strip plates 11 and 12. Since welding is performed and the horizontal side portion-side convex step portion 7 and the vertical side portion-side convex step portion 9 are welded in a state of covering the non-convex step portion side vertical and horizontal side portions 7o, 9o of the other lining plate 2. Even if the mechanical strength of the lining layer 3 itself and the attachment strength of the lining layer 3 to the bleaching tower body 1 are increased, and the inside of the bleaching tower body 1 is in a vacuum state, the lining layer 3 is not destroyed.

1 晒塔本体(反応塔本体)
2 ライニング板
3 ライニング層
6,8 屈曲部
7,9 凸段部
7o,9o 非凸段部側縦横辺部
11 横帯板
12 縦帯板
13 セグメント
1 Bleach tower body (reaction tower body)
2 Lining plate 3 Lining layers 6 and 8 Bent portions 7 and 9 Convex step portions 7o and 9o Non-convex step portion side vertical and horizontal sides 11 Horizontal strip 12 Vertical strip 13 Segment

Claims (3)

反応塔本体の内周面に、所定の厚さと幅を有する耐食性金属板からなる横帯板を、上下方向一定間隔おきに固着すると共に、上下に隣り合う帯板間に同様な縦帯板を左右方向一定間隔おきに固着し、上下に隣り合う横帯板と左右に隣り合う縦帯板とによって区画形成されるセグメントに対応する矩形状に形成された耐食性金属板からなるライニング板で、一つの横辺部側と一つの縦辺部側とが屈曲部を介して夫々凸段部を所定幅で形成してなるライニング板を、各セグメント内に配置して、非凸段部側縦横辺部の側縁部を縦横帯板の側縁部に溶接すると共に、縦横の凸段部は対応する縦横の帯板上に夫々載せ掛け、この載せ掛けたライニング板の縦横凸段部には、夫々隣り合う他のライニング板の非凸段部側の縦辺部及び横辺部を夫々内側に挟み込んで、これら縦横凸段部の外周縁に沿って他のライニング板の非凸段部側縦横辺部に対し溶接し、これを全てのセグメントに亘って行うことにより耐食性ライニング層を形成するようにした反応塔のライニング方法。   A horizontal strip made of a corrosion-resistant metal plate having a predetermined thickness and width is fixed to the inner peripheral surface of the reaction tower body at regular intervals in the vertical direction, and a similar vertical strip is placed between adjacent strips in the vertical direction. A lining plate made of a corrosion-resistant metal plate, which is fixed at regular intervals in the left-right direction and is formed in a rectangular shape corresponding to a segment defined by a horizontal strip adjacent to the top and bottom and a vertical strip adjacent to the left and right. A non-convex stepped portion side vertical side is formed by arranging a lining plate in which each horizontal side portion side and one vertical side portion side are formed in each segment by forming a convex step portion with a predetermined width via a bent portion. Welding the side edge part of the part to the side edge part of the vertical and horizontal strips, and the vertical and horizontal convex steps are respectively placed on the corresponding vertical and horizontal strips, and the vertical and horizontal convex steps of this lining plate are The vertical side and the horizontal side on the non-convex step portion side of the other adjacent lining plates are respectively inward. The corrosion-resistant lining layer is formed by welding to the non-convex stepped portion side vertical and horizontal sides of the other lining plates along the outer peripheral edges of these vertical and horizontal convex steps, and performing this over all the segments. A method for lining the reaction tower. 各ライニング板は、横辺部側凸段部が上辺側に位置するようにセグメント内に配置するようにした請求項1に記載の反応塔のライニング方法。   2. The lining method for a reaction tower according to claim 1, wherein each of the lining plates is arranged in the segment so that the convex portion on the side of the lateral side is positioned on the upper side. ライニング板及び縦横の帯板は、チタン又はステンレスからなる請求項1に記載の反応塔のライニング方法。   The lining method for a reaction tower according to claim 1, wherein the lining plate and the vertical and horizontal strips are made of titanium or stainless steel.
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