JP7379874B2 - gas conveying pipe - Google Patents

gas conveying pipe Download PDF

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JP7379874B2
JP7379874B2 JP2019106757A JP2019106757A JP7379874B2 JP 7379874 B2 JP7379874 B2 JP 7379874B2 JP 2019106757 A JP2019106757 A JP 2019106757A JP 2019106757 A JP2019106757 A JP 2019106757A JP 7379874 B2 JP7379874 B2 JP 7379874B2
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康夫 村井
隆昌 松永
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Description

本発明は、石炭、石膏、木粉、穀類などの粉粒体を搬送気体によって管内を連続的に搬送することができる気体搬送管に関する。 TECHNICAL FIELD The present invention relates to a gas transport pipe capable of continuously transporting granular materials such as coal, gypsum, wood flour, and grains through the pipe using a transport gas.

石炭、石膏、木粉、穀類などの粉粒体を空気などの搬送気体によって配管内で連続的に搬送する気体搬送装置がある。一般的な気体搬送装置は、粉粒体の供給タンクと貯蔵タンクの間を結ぶ管路を設け、管路に圧送式又は吸引式の空気供給源を備えている。この気体搬送装置は、長期に亘って稼働を継続すると粉粒体と管内面との接触部分が摩耗して穴が開くトラブルが発生することがある。このため従来、種々の摩耗対策が提案されている。例えば、粉粒体の搬送速度を低下させて衝突時の衝撃を緩和したり、管内面の接触部分に耐摩耗性のライニングを施行したり（特許文献１に開示有り）、又は粉粒体を管内部で故意に滞留させるセルフライニングによって摩耗を防止する対策が取られていた。 There is a gas conveying device that continuously conveys granular materials such as coal, gypsum, wood flour, and grains within piping using a carrier gas such as air. A typical gas conveying device is provided with a conduit connecting a powder supply tank and a storage tank, and the conduit is equipped with a pressure-feeding type or suction type air supply source. If this gas conveying device continues to operate for a long period of time, the contact portion between the powder and the inner surface of the tube may wear out, causing a problem that holes may form. For this reason, various wear countermeasures have been proposed in the past. For example, reducing the conveyance speed of powder or granular material to reduce the impact upon collision, applying wear-resistant lining to the contact area on the inner surface of the tube (disclosed in Patent Document 1), or Measures were taken to prevent wear through self-lining, which was intentionally retained inside the tube.

この他、特許文献２に開示の摩耗抑制装置は、配管の摩耗箇所の上流側で粉粒体に導入粒子を衝突させて摩耗箇所に衝突する粉粒体の衝突エネルギーを減少させて摩耗を抑制している。
また特許文献３の技術は、配管内に翼車を設けて管内の粉粒体の堆積を防止している。特許文献４の技術は、配管面に中心側へ向けて突出する複数の螺旋凸状、螺旋羽板を設けて管路途中の閉塞、脈動をなくしている。
しかしながら、搬送速度を低下させた場合、低下させた部分から粉粒体の堆積量が増加し、管路の有効通過断面積が減少して速度が増加して堆積部以外の管内面の摩耗が増えることになる。また速度低下により粉粒体と搬送気体の混合比が高くなり、配管の水平部分に粉粒体が停留し、輸送圧力上昇のあと管内閉塞により搬送が不可能となる。 In addition, the wear suppression device disclosed in Patent Document 2 reduces the collision energy of the powder and granules colliding with the worn part by colliding introduced particles with the powder and granular material upstream of the worn part of the piping, thereby suppressing wear. are doing.
Further, the technique disclosed in Patent Document 3 provides an impeller within the pipe to prevent the accumulation of powder inside the pipe. The technique of Patent Document 4 eliminates blockage and pulsation in the middle of the pipe by providing a plurality of spiral convex shapes and spiral blades protruding toward the center on the pipe surface.
However, when the conveyance speed is lowered, the amount of powder particles deposited increases from the lowered part, the effective passage cross-sectional area of the pipe decreases, the speed increases, and the inner surface of the pipe other than the part where the transport speed is reduced is worn out. It will increase. In addition, due to the decrease in speed, the mixing ratio of the powder and the carrier gas increases, and the powder remains in the horizontal portion of the pipe, and after the transport pressure increases, the pipe becomes blocked and transport becomes impossible.

またセルフライニングを形成するためには、粉粒体の搬送速度、粉粒体の混合比を適切に管理しなければ成立しないが、実機において粉粒体の供給量を一定に保つことは難しく、その結果、混合比の変化に伴う管内流速が増加し（粉粒体の閉塞により通過面積が少なくなり速度が増加）、堆積部以外の摩耗量が増えることになる。特許文献２によれば、装置が複雑となり高コスト化し、粉粒体に異物が混入することになる。また特許文献３によれば、管内の断面方向に翼を設けているため、粉粒体が減速して通過後に堆積してしまう。電動駆動の翼の場合回転速度の最適な速度設定が難しい。管内流速で翼を通過させなければ、粉粒体がはじかれて通過できずに分級機となってしまう。また特許文献４によれば、管路内の全周に亘って螺旋凸状を設ける構成のため、特に粉粒体の濃度が高く、停留し易い管路底部にこのような凸状を設けると障害物となり、ここから堆積成長してしまうおそれがある。
このように摩耗対策の際には、粉粒体の搬送量、換言すると搬送気体との混合比を一定にすることは難しく、粉粒体の速度低下と停留の両方を満足させる稼働が求められている。 In addition, in order to form self-lining, the transport speed of the powder and the mixing ratio of the powder must be appropriately controlled, but it is difficult to maintain a constant supply amount of the powder in an actual machine. As a result, the flow velocity in the pipe increases as the mixing ratio changes (the passage area decreases due to blockage of the powder and the velocity increases), and the amount of wear other than the deposited portion increases. According to Patent Document 2, the device becomes complicated and the cost increases, and foreign matter may be mixed into the powder or granular material. Further, according to Patent Document 3, since wings are provided in the cross-sectional direction of the pipe, the powder particles decelerate and accumulate after passing through. In the case of electrically driven blades, it is difficult to set the optimum rotational speed. If the tube is not allowed to pass through the blades at the same flow rate within the tube, the powder will be repelled and cannot pass through, resulting in a classifier. Further, according to Patent Document 4, since a spiral convex shape is provided all around the inside of the pipe, it is possible to provide such a convex shape at the bottom of the pipe where the concentration of powder and granules is particularly high and where they tend to stagnate. There is a risk that it will become an obstacle and that it will accumulate and grow from there.
In this way, when taking measures against wear, it is difficult to maintain a constant conveyance amount of powder or granular material, or in other words, the mixing ratio with the carrier gas, and operation that satisfies both the reduction in speed and the stagnation of powder and granular material is required. ing.

特開２００７－１１２５６８号公報Japanese Patent Application Publication No. 2007-112568 特開２０１２－１９７９１９号公報Japanese Patent Application Publication No. 2012-197919 特開平１０－１７１４６号公報Japanese Patent Application Publication No. 10-17146 特開平１０－１７１４７号公報Japanese Patent Application Publication No. 10-17147

本発明が解決しようとする課題は、上記従来技術の問題点に鑑み、搬送気体により粉粒体を搬送する際に、管路内の滞留と、管路の局部摩耗を効率的に防止できる気体搬送管を提供することにある。 The problem to be solved by the present invention is to provide a gas that can efficiently prevent retention in a pipe line and local wear of the pipe line when transporting powder or granular material using a carrier gas, in view of the problems of the prior art described above. The purpose is to provide a conveyor pipe.

本発明は、上記課題を解決するための第１の手段として、粉粒体を搬送気体によって管内を連続的に搬送する気体搬送管において、
管路途中の曲げ部分の上流側で管内面から中心に向けて突出して気流の一部を変化させる羽板を設け、前記羽板は、前記管路の断面を座標平面とし、前記管路の中心を座標中心としたときにＹ軸を前記管路の中心を通り曲り方向に対して曲率の大きい前記管路の流速の速いエリアを＋Ｙ、曲率の小さい前記管路の前記流速の遅いエリアを－Ｙとし、Ｘ軸を前記管路の中心を通り前記Ｙ軸と直交する方向とするＸＹ座標軸で区切った第１～第４象限に設けて、前記管路の軸回りで前記ＸＹ座標軸に向けて旋回流を発生可能なことを特徴とする気体搬送管を提供することにある。
上記第１の手段によれば、管路の通過抵抗の少ない旋回流を発生させて、粉粒体が滞留又は衝突することがなく、粉粒体の滞留と局部摩耗を防止できる。 As a first means for solving the above-mentioned problems, the present invention provides a gas transport pipe that continuously transports powder and granules through the pipe using a transport gas.
A blade is provided on the upstream side of a bent part in the middle of the pipe , protruding from the inner surface of the pipe toward the center to change a part of the airflow, and the blade has a cross section of the pipe as a coordinate plane, and the blade has a cross section of the pipe. When the center is the coordinate center, the Y-axis passes through the center of the pipe and the area of high flow velocity of the pipe with a large curvature in the bending direction is +Y, and the area of the pipe with a low flow velocity of a small curvature is +Y. −Y, with the X axis passing through the center of the conduit and perpendicular to the Y axis, provided in the first to fourth quadrants separated by the XY coordinate axes, and directed around the axis of the conduit toward the XY coordinate axes. An object of the present invention is to provide a gas transport pipe characterized in that it can generate a swirling flow.
According to the first means, it is possible to generate a swirling flow with little resistance to passage through the pipe, so that the powder particles do not stagnate or collide with each other, and the accumulation and local wear of the powder particles can be prevented.

本発明は、上記課題を解決するための第２の手段として、第１の手段において、前記羽板は、前記第１～第４象限に各々設けて、前記ＸＹ座標軸上を除いたことを特徴とする気体搬送管を提供することにある。
上記第２の手段によれば、搬送気体の流速の差が大きい管路上部と底部に羽板を設けずに気流の障害物とならない構成により、管路の通過抵抗の少ない旋回流を発生させて、粉粒体が滞留又は衝突することがなく、粉粒体の滞留と局部摩耗を防止できる。 As a second means for solving the above problem, the present invention is characterized in that, in the first means, the wing plates are provided in each of the first to fourth quadrants, excluding those on the XY coordinate axes. An object of the present invention is to provide a gas conveying pipe that has the following properties.
According to the second means, a swirling flow with low resistance to passage through the pipe is generated by not providing blades at the top and bottom of the pipe where there is a large difference in the flow velocity of the carrier gas, so that the airflow does not become an obstacle. Therefore, the powder and granules do not stay or collide, and it is possible to prevent the powder and granules from accumulating and local wear.

本発明によれば、曲げ管の上流側で管路通過抵抗の少ない旋回流を生じさせて配管内部で滞留と局部摩耗が生じることがない。 According to the present invention, a swirling flow with low resistance to passing through the pipe is generated on the upstream side of the bent pipe, so that stagnation and local wear do not occur inside the pipe.

本発明の気体搬送管の説明図である。FIG. 2 is an explanatory diagram of a gas conveying pipe of the present invention. 管路中の羽板の説明図である。It is an explanatory view of the wing board in a conduit.

本発明の気体搬送管の実施形態について、図面を参照しながら、以下詳細に説明する。 Embodiments of the gas transport pipe of the present invention will be described in detail below with reference to the drawings.

［気体搬送管１０］
図１は本発明の気体搬送管の説明図であり、管路断面の上流側から下流側を見た断面図である。図２は管路中の羽板の説明図である。
図示のように本発明の気体搬送管１０は、石炭、石膏、木粉、穀類などの粉粒体を搬送気体によって搬送する管路（配管ともいう）１２の曲げ管に取り付けるものであり、管内に気流の一部を変化させる羽板２０を有している。 [Gas transport pipe 10]
FIG. 1 is an explanatory diagram of a gas conveying pipe according to the present invention, and is a cross-sectional view of the pipe line viewed from the upstream side to the downstream side. FIG. 2 is an explanatory diagram of the blades in the conduit.
As shown in the figure, the gas conveying pipe 10 of the present invention is attached to a bent pipe of a conduit (also referred to as piping) 12 that transports powdered materials such as coal, gypsum, wood flour, and grains by means of a carrier gas. It has a wing plate 20 that changes part of the airflow.

（羽板２０）
羽板２０は、平面視でほぼ矩形の平板であり、横（管路１２の気流と直交する辺）長さが管路１２の半径長さよりも小さく設定している。羽板２０の材質は各種の粉粒体の衝突に耐え得る所定の剛性と耐摩耗性を備えた鋼材を用いている。本実施形態の羽板２０は、管路１２の断面を座標平面とし、管路１２の中心を中心座標としたときに、ＸＹ座標軸で区切った第１～第４象限に設けて、管路１２の軸回りでＸＹ座標軸に向けて旋回流を発生可能としている。
羽板２０は、管路１２の内面から中心に向けて突出するように溶接等により取り付けている。 (Feather board 20)
The wing plate 20 is a flat plate that is substantially rectangular in plan view, and the lateral length (the side perpendicular to the airflow of the pipe line 12) is set to be smaller than the radial length of the pipe line 12. The material for the blades 20 is a steel material that has a predetermined rigidity and abrasion resistance that can withstand collisions with various types of powder and granular materials. The blade plate 20 of this embodiment is provided in the first to fourth quadrants divided by the XY coordinate axes, when the cross section of the pipe 12 is taken as a coordinate plane, and the center of the pipe line 12 is taken as the center coordinate. A swirling flow can be generated around the axis toward the XY coordinate axes.
The wing plate 20 is attached by welding or the like so as to protrude from the inner surface of the conduit 12 toward the center.

第１象限の羽板２０ａは、上流側端部を下流側端部よりも上方に配置して、主面に当たった気流が＋Ｘ座標を跨いで第４象限側に流れるように取り付けている（図１矢印ａ参照）。
第２象限の羽板２０ｂは、下流側端部を上流側端部よりも上方に配置して、主面に当たった気流が＋Ｙ軸座標を跨いで第１象限側に流れるように取り付けている（図１矢印ｂ参照）。
第３象限の羽板２０ｃは、下流側端部を上流側端部よりも上方に配置して、主面に当たった気流が－Ｘ軸座標を跨いで第２象限側に流れるように取り付けている（図１矢印ｃ参照）。
第４象限の羽板２０ｄは、上流側端部を下流側端部よりも上方に配置して、主面に当たった気流が－Ｙ軸座標を跨いで第３象限側に流れるように取り付けている（図１矢印ｄ参照）。 The blades 20a in the first quadrant are installed so that the upstream end is placed above the downstream end so that the airflow that hits the main surface flows toward the fourth quadrant across the +X coordinate ( (See arrow a in Figure 1).
The blades 20b in the second quadrant are installed so that the downstream end is placed above the upstream end so that the airflow that hits the main surface flows toward the first quadrant across the +Y-axis coordinate. (See arrow b in Figure 1).
The blade 20c in the third quadrant is installed so that the downstream end is placed above the upstream end so that the airflow that hits the main surface flows to the second quadrant across the -X axis coordinate. (See arrow c in Figure 1).
The blade 20d in the fourth quadrant is installed so that the upstream end is placed above the downstream end so that the airflow that hits the main surface flows toward the third quadrant across the -Y axis coordinate. (See arrow d in Figure 1).

搬送気体が流れる管路の曲げ部（ほぼ９０度折り曲げた曲げ管、エルボ（管継手）ともいう）は、上部（＋Ｙ軸）の流速が速く（図１中の流速の速いエリア参照）、粉粒体の濃度が薄い。一方、下部（－Ｙ軸）の流速が遅く（図１中の流速の遅いエリア参照）、粉粒体の濃度が高い。またＸ軸上（±Ｘ軸）は流速が中立のエリアとなっている。
そして羽板２０ａ～２０ｄの構成によって、上流側から下流側に向けて右回りの旋回流を発生させて、配管上部の速い流速の気流を＋Ｘ軸側の中立エリアへと導き、配管下部の遅い流速の気流を－Ｘ軸側の中立エリアへと導いている。これにより管路１２上部の速い流速を遅くさせて、管路１２底部の滞留物を攪拌させることができる。羽板２０ａ～２０ｄにより管路１２上下の搬送気体の全体的な流れの差を少なくして、局部摩耗を低減でき、底部の滞留物も低減できる。
なお羽板２０は、既設管と同径の管路を接続管とし、この接続管の管内面に設けた構成とし、接続管と既設管との接続部分にフランジを設けて締結手段により固定する構成を採用しても良い。
また羽板２０ａ～２０ｄは、前述の上流側端部及び下流側端部を上下逆転し、左回りの旋回流を発生させる構成であっても良い。 In the bent part of the pipe through which the carrier gas flows (a bent pipe bent approximately 90 degrees, also called an elbow (pipe joint)), the flow velocity is high at the top (+Y axis) (see the area with high flow velocity in Figure 1), and the flow rate is high at the top (+Y axis). The concentration of grains is low. On the other hand, the flow velocity in the lower part (-Y axis) is slow (see the area of slow flow velocity in FIG. 1), and the concentration of powder and granular material is high. Further, on the X axis (±X axis) is an area where the flow velocity is neutral.
The configuration of the blades 20a to 20d generates a clockwise swirling flow from the upstream side to the downstream side, guiding the high velocity airflow at the top of the piping to the neutral area on the + It guides the high velocity airflow to the neutral area on the -X axis side. As a result, the high flow rate in the upper part of the pipe 12 can be slowed down, and the stagnant material in the bottom part of the pipe 12 can be agitated. The vanes 20a to 20d can reduce the difference in the overall flow of the carrier gas above and below the pipe line 12, thereby reducing local wear and stagnation at the bottom.
Note that the wing plate 20 has a structure in which a pipe line with the same diameter as the existing pipe is used as a connecting pipe, and is provided on the inner surface of the connecting pipe, and a flange is provided at the connection part between the connecting pipe and the existing pipe and is fixed by fastening means. You may adopt a configuration.
Further, the blades 20a to 20d may have a structure in which the above-described upstream end and downstream end are reversed up and down to generate a counterclockwise swirling flow.

［作用］
上記構成による本発明の気体搬送管１０の作用について、以下説明する。管路１２の送風ファン（不図示）により搬送気体を送風すると、粉粒体は遠心力と重力により管路１２底部に、曲げ管の流速の遅いエリアに滞留し易い。粉粒体を含む気流が曲げ管を通過する際に、曲げ管の上流側に設けた羽板２０ａ～２０ｄに当たる。羽板２０ａ～２０ｄにより右回りの旋回流が発生すると、管路１２上部の流速の速いエリアの流速が遅くなり、管路１２底部の流速の遅いエリアの流速が速くなり、全体的に流れの差が少なくなる。曲げ管の粉粒体の滞留を攪拌してなくなり、局部摩耗も低減できる。本実施形態の羽板２０ａ～２０ｄは、管路の流れの差が大きい±Ｙ座標軸上に設けておらず、気流を邪魔しない小サイズ（横長さが管路の半径よりも小さい）で４か所に分散させて設置しているので、管路の通過抵抗が少ない旋回流を発生させることができる。 [Effect]
The operation of the gas transport pipe 10 of the present invention having the above configuration will be explained below. When the carrier gas is blown by a blower fan (not shown) in the pipe line 12, the powder particles tend to stay at the bottom of the pipe line 12 due to centrifugal force and gravity, in an area of the bent pipe where the flow velocity is slow. When the air flow containing powder passes through the bent pipe, it hits the blades 20a to 20d provided on the upstream side of the bent pipe. When a clockwise swirl flow is generated by the blades 20a to 20d, the flow velocity in the high velocity area at the top of the pipe 12 becomes slow, and the flow velocity in the low flow velocity area at the bottom of the pipe 12 increases, resulting in an overall increase in the flow. The difference becomes smaller. It agitates and eliminates the accumulation of powder particles in the bent pipe, and reduces local wear. The blades 20a to 20d of this embodiment are not provided on the ±Y coordinate axis, where the difference in the flow of the pipe is large, and are small in size (horizontal length is smaller than the radius of the pipe) so as not to obstruct the airflow. Since they are installed in a dispersed manner, it is possible to generate a swirling flow with little resistance to passage through the pipe.

このような本発明の気体搬送管１０によれば、実稼働時に混合比や管内流速が変動した場合でも、粉粒体が常に同じ場所で滞留又は衝突することがなく、粉粒体の滞留と局部摩耗を防止できる。また羽板が主面を気流に沿って配置した状態では、粉粒体との衝突を低減でき通過時に障害となることがなく、粉粒体をスムーズに流すことができる。 According to the gas conveying pipe 10 of the present invention, even if the mixing ratio or the flow velocity in the pipe changes during actual operation, the powder and granules do not always stay in the same place or collide, and the stagnation of the powder and granules does not occur. Local wear can be prevented. In addition, when the main surface of the blade is arranged along the airflow, collisions with the powder or granular material can be reduced, and the powder or granular material can flow smoothly without becoming an obstacle during passage.

以上、本発明の好ましい実施形態について説明した。しかしながら、本発明は、上記実施形態に何ら制限されることなく、本発明の主旨を逸脱しない範囲において、種々の変更が可能である。
また、本発明は、実施形態において示された組み合わせに限定されることなく、種々の組み合わせによって実施可能である。 The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.
Further, the present invention is not limited to the combinations shown in the embodiments, but can be implemented by various combinations.

本発明の気体搬送管は、特に石炭、石膏、木粉、穀類などの粉粒体を搬送気体によって管内を連続的に搬送する分野において産業上の利用可能性を有する。 The gas transport pipe of the present invention has industrial applicability, particularly in the field of continuously transporting granular materials such as coal, gypsum, wood flour, and grains through the pipe using a transport gas.

１０ 気体搬送管
１２ 管路
２０ａ～２０ｄ 羽板 10 Gas conveying pipe 12 Pipe lines 20a to 20d Wing plate

Claims (2)

粉粒体を搬送気体によって管内を連続的に搬送する気体搬送管において、
管路途中の曲げ部分の上流側で管内面から中心に向けて突出して気流の一部を変化させる羽板を設け、前記羽板は、前記管路の断面を座標平面とし、前記管路の中心を座標中心としたときにＹ軸を前記管路の中心を通り曲り方向に対して曲率の大きい前記管路の流速の速いエリアを＋Ｙ、曲率の小さい前記管路の前記流速の遅いエリアを－Ｙとし、Ｘ軸を前記管路の中心を通り前記Ｙ軸と直交する方向とするＸＹ座標軸で区切った第１～第４象限に設けて、前記管路の軸回りで前記ＸＹ座標軸に向けて旋回流を発生可能なことを特徴とする気体搬送管。 In a gas transport pipe that continuously transports powder and granules through the pipe using a transport gas,
A blade is provided on the upstream side of a bent part in the middle of the pipe , protruding from the inner surface of the pipe toward the center to change a part of the airflow, and the blade has a cross section of the pipe as a coordinate plane, and the blade has a cross section of the pipe. When the center is the coordinate center, the Y-axis passes through the center of the pipe and the area of high flow velocity of the pipe with a large curvature in the bending direction is +Y, and the area of the pipe with a low flow velocity of a small curvature is +Y. −Y, with the X axis passing through the center of the conduit and perpendicular to the Y axis, provided in the first to fourth quadrants separated by the XY coordinate axes, and directed around the axis of the conduit toward the XY coordinate axes. A gas transfer pipe characterized by being capable of generating a swirling flow. 請求項１に記載された気体搬送管において、
前記羽板は、前記第１～第４象限に各々設けて、前記ＸＹ座標軸上を除いたことを特徴とする気体搬送管。 The gas conveying pipe according to claim 1,
A gas conveying pipe characterized in that the blades are provided in each of the first to fourth quadrants, excluding those on the XY coordinate axes.
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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080210325A1 (en) 2005-05-11 2008-09-04 Abdelwahab Aroussi Distributor

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57111726U (en) * 1980-12-26 1982-07-10
JPS6085531U (en) * 1983-11-15 1985-06-12 西出　博行 Pipe for transporting powder and granular materials
JPS62105930U (en) * 1985-12-24 1987-07-06

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080210325A1 (en) 2005-05-11 2008-09-04 Abdelwahab Aroussi Distributor

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