JP6007014B2 - Equipment for removing foreign matter in gas piping - Google Patents
Equipment for removing foreign matter in gas piping Download PDFInfo
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Description
本発明は、天然ガス等のガス中に含まれる酸化鉄等の異物を分離、除去するためのガス配管中の異物の除去装置に関する。 The present invention relates to an apparatus for removing foreign matter in a gas pipe for separating and removing foreign matters such as iron oxide contained in a gas such as natural gas.
一般に、天然ガス等の燃料ガスは鋼管製の燃料ガス配管により輸送され、その燃料ガス配管にはストレーナが接続されている。そして、燃料ガス中に酸化鉄等の異物が含まれていると、その異物がストレーナで捕集され、ストレーナの出入口における差圧が上昇する。この差圧がさらに上昇すると、燃料ガスを使用するユニットを停止しなければならない。そのような事態を回避するため、ストレーナを二重にすることも可能であるが、既設の燃料ガス配管に新たにストレーナを設置するスペースが必要になり、コストも嵩むという問題がある。 Generally, fuel gas such as natural gas is transported by a steel pipe fuel gas pipe, and a strainer is connected to the fuel gas pipe. If the fuel gas contains foreign matter such as iron oxide, the foreign matter is collected by the strainer, and the differential pressure at the inlet / outlet of the strainer increases. As this differential pressure rises further, the unit using the fuel gas must be stopped. In order to avoid such a situation, it is possible to double the strainer, but there is a problem that a space for newly installing the strainer is required in the existing fuel gas pipe, and the cost is increased.
この種のガス中に含まれる異物の除去装置が特許文献１に開示されている。すなわち、この除去装置では、配管の途中にオリフィスを設け、そのオリフィス出口側の配管の下方にドレン管を取付け、このドレン管からオリフィスの入り口側へ向かって細孔が穿設されている。この除去装置によれば、オリフィスの出口側において乱流が発生するとともに、細孔内をドレン管側からオリフィス入り口側へ流体が流れるため乱流はさらに助長され、乱流中の異物は粒子沈降現象によりドレン管内に沈降する。 Patent Document 1 discloses an apparatus for removing foreign substances contained in this type of gas. That is, in this removing device, an orifice is provided in the middle of the pipe, a drain pipe is attached below the pipe on the outlet side of the orifice, and a pore is formed from the drain pipe toward the inlet side of the orifice. According to this removal device, turbulent flow is generated on the outlet side of the orifice, and the fluid flows in the pores from the drain pipe side to the orifice inlet side, so that the turbulent flow is further promoted, and the foreign matter in the turbulent flow is settling the particles. It settles in the drain pipe due to the phenomenon.
しかしながら、前述した特許文献１に記載されている従来構成の除去装置においては、配管にオリフィスを設け、その出口側にドレン管を取付けるとともに、オリフィス部分には細孔を斜めに貫通形成しなければならない。このため、除去装置の構成が複雑になるとともに、その製作が面倒になる。さらには、オリフィスの出口側における乱流を助長するために、前記細孔の位置、大きさ、角度等の設定が難しく、乱流を助長することは容易ではない。加えて、特許文献１の除去装置では、流体が具体的には水等の液体であることから、流体がガスである場合にそのまま適用することはできないという問題がある。 However, in the conventional removal apparatus described in Patent Document 1 described above, an orifice is provided in the pipe, a drain pipe is attached to the outlet side, and a pore is not formed obliquely in the orifice portion. Don't be. This complicates the configuration of the removal device and makes its production cumbersome. Furthermore, in order to promote turbulent flow on the outlet side of the orifice, it is difficult to set the position, size, angle and the like of the pores, and it is not easy to promote turbulent flow. In addition, since the fluid is specifically a liquid such as water, the removal device of Patent Document 1 has a problem that it cannot be applied as it is when the fluid is a gas.
そこで、本発明の目的とするところは、簡易な構成で、ガス中の異物を効率良く捕集することができるガス配管中の異物の除去装置を提供することにある。 Accordingly, an object of the present invention is to provide an apparatus for removing foreign matter in a gas pipe that can efficiently collect foreign matter in gas with a simple configuration.
上記の目的を達成するために、請求項１に記載の発明のガス配管中の異物の除去装置は、ガスが流通する配管には鉛直部から水平部へ流路方向を変更するエルボ部を設け、ガスが鉛直部を下降してエルボ部から水平部へ流れるように構成し、前記エルボ部の上流側でエルボ部に近接する鉛直部には配管の内径を絞った絞り部を形成するとともに、前記エルボ部の下流側で鉛直部の延長方向にはガス中の異物を捕集する異物捕集部を設けるとともに、前記絞り部の中心を鉛直部の中心から水平部とは反対方向に離れる位置に設けたことを特徴とする。 In order to achieve the above object, the apparatus for removing foreign matter in a gas pipe according to the invention described in claim 1 is provided with an elbow part that changes the flow direction from the vertical part to the horizontal part in the pipe through which the gas flows. The gas is configured to flow down the vertical part and flow from the elbow part to the horizontal part, and on the upstream side of the elbow part, a vertical part close to the elbow part is formed with a throttle part with a narrowed inner diameter of the pipe, away in the opposite direction to the horizontal portion from the downstream Rutotomoni provided foreign matter collecting unit for collecting foreign matter in the gas is in the extending direction of the vertical portion at the side, the center of the vertical portion of the center of the narrowed portion of the elbow portion It is provided at a position .
請求項２に記載の発明のガス配管中の異物の除去装置は、請求項１に係る発明において、前記配管は円筒状に形成され、絞り部は下流側ほど縮径する縮径テーパ部と下流側ほど拡径する拡径テーパ部とが連なるようにして形成されていることを特徴とする。 According to a second aspect of the present invention, there is provided the apparatus for removing foreign matter from a gas pipe according to the first aspect of the invention, wherein the pipe is formed in a cylindrical shape and the diameter of the throttle portion is reduced toward the downstream side. It is characterized in that it is formed so as to be connected to a diameter-increasing taper portion whose diameter increases toward the side.
請求項３に記載の発明のガス配管中の異物の除去装置は、請求項２に係る発明において、前記絞り部の内径は、鉛直部の内径の１／３〜２／３であることを特徴とする。
請求項４に記載の発明のガス配管中の異物の除去装置は、請求項１から請求項３のいずれか一項に係る発明において、前記ガスは燃料ガスであり、異物は酸化鉄を含有するものであることを特徴とする。
According to a third aspect of the present invention, there is provided the apparatus for removing foreign matter from a gas pipe according to the second aspect of the present invention, wherein the inner diameter of the throttle portion is 1/3 to 2/3 of the inner diameter of the vertical portion. And
According to a fourth aspect of the present invention, there is provided the apparatus for removing foreign matter in a gas pipe according to any one of the first to third aspects, wherein the gas is a fuel gas and the foreign matter contains iron oxide. It is characterized by being.
請求項５に記載の発明のガス配管中の異物の除去装置は、請求項４に係る発明において、前記異物の平均粒子径は１０〜４００μｍであることを特徴とする。
請求項６に記載の発明のガス配管中の異物の除去装置は、請求項４又は請求項５に係る発明において、前記燃料ガスの流速は、１０〜４０ｍ／ｓであることを特徴とする。
According to a fifth aspect of the present invention, there is provided the apparatus for removing foreign matter from a gas pipe according to the fourth aspect, wherein the average particle size of the foreign matter is 10 to 400 μm.
According to a sixth aspect of the present invention, there is provided the apparatus for removing foreign matter from a gas pipe according to the fourth or fifth aspect, wherein the flow rate of the fuel gas is 10 to 40 m / s.
本発明によれば、次のような効果を発揮することができる。
本発明のガス配管中の異物の除去装置では、ガスが流通する配管には鉛直部から水平部へ流路方向を変更するエルボ部が設けられ、ガスが鉛直部を下降してエルボ部から水平部へ流れるように構成されている。そして、エルボ部の上流側でエルボ部に近接する鉛直部には絞り部が設けられ、エルボ部の下流側で鉛直部の延長方向には異物捕集部が設けられている。
According to the present invention, the following effects can be exhibited.
In the apparatus for removing foreign matter in a gas pipe according to the present invention, an elbow part that changes the flow direction from a vertical part to a horizontal part is provided in a pipe through which the gas flows, and the gas descends the vertical part to be horizontal from the elbow part. It is configured to flow to the part. In addition, a throttle part is provided in the vertical part close to the elbow part on the upstream side of the elbow part, and a foreign matter collecting part is provided in the extending direction of the vertical part on the downstream side of the elbow part.
このため、配管の鉛直部に絞り部を設けるとともに、鉛直部の延長方向に異物捕集部を設けるという簡単な構造で異物の捕集を行うことができる。この場合、鉛直部内の異物は全体に分散された状態にあるが、絞り部に到ると絞りの中心部に集められるとともに、ガスの流速は速められ、異物は中心部に集められた状態で慣性力によりそのままの状態で真っ直ぐに流れて異物捕集部に捕集される。従って、異物の捕集率を高めることができる。
さらに、絞り部の中心が鉛直部の中心より水平部とは反対側に位置するように偏心されていることから、異物の捕集率を向上させることができる。
For this reason, it is possible to collect foreign matters with a simple structure in which the throttle portion is provided in the vertical portion of the pipe and the foreign matter collecting portion is provided in the extending direction of the vertical portion. In this case, the foreign matter in the vertical part is dispersed throughout, but when it reaches the throttle part, it is collected in the central part of the throttle, the gas flow rate is increased, and the foreign substance is collected in the central part. It flows straight as it is due to the inertial force and is collected in the foreign matter collecting part. Therefore, the collection rate of foreign matters can be increased.
Furthermore, since the center of the throttle portion is decentered so as to be located on the opposite side of the horizontal portion from the center of the vertical portion, the foreign matter collection rate can be improved.
よって、本発明のガス配管中の異物の除去装置によれば、簡易な構成で、ガス中の異物を効率良く捕集することができるという効果を奏する。 Therefore, according to the foreign substance removal device in the gas pipe of the present invention, there is an effect that the foreign substance in the gas can be efficiently collected with a simple configuration.
（第１実施形態）
以下、本発明を具体化した第１実施形態に関し、図１及び図２に基づいて詳細に説明する。
(First embodiment)
Hereinafter, a first embodiment of the present invention will be described in detail with reference to FIGS. 1 and 2.
図１（ａ）及び（ｂ）に示すように、燃料ガスとしての天然ガスは、図示しない貯留タンクから輸送配管１１で送られ、ストレーナ１２を介してガスタービン等の使用設備へ供給されるようになっている。輸送配管１１を流れるガスとしては、天然ガスのほか、水素（Ｈ２）、メタン（ＣＨ４）、プロパン（Ｃ３Ｈ８）等が用いられる。円筒状をなす輸送配管１１には鉛直部１３から水平部１４へ流路方向を９０度変更するエルボ部１５が設けられ、天然ガスが鉛直部１３を下降してエルボ部１５から水平部１４へ流れるように構成されている。なお、エルボ部１５は、ガスの流れとしてはエルボ、配管構造としてはチーズ（Ｔ字）である。前記エルボ部１５の上流側位置でエルボ部１５に近接する鉛直部１３には、輸送配管１１の内径を絞った絞り部１６が形成されている。 As shown in FIGS. 1 (a) and 1 (b), natural gas as fuel gas is sent from a storage tank (not shown) through a transportation pipe 11 and supplied to a use facility such as a gas turbine via a strainer 12. It has become. As the gas flowing through the transport pipe 11, hydrogen (H 2 ), methane (CH 4 ), propane (C 3 H 8 ) and the like are used in addition to natural gas. The cylindrical transport pipe 11 is provided with an elbow part 15 that changes the flow direction by 90 degrees from the vertical part 13 to the horizontal part 14, and natural gas descends the vertical part 13 from the elbow part 15 to the horizontal part 14. It is configured to flow. In addition, the elbow part 15 is an elbow as a gas flow, and cheese (T-shape) as a piping structure. In the vertical portion 13 close to the elbow portion 15 at a position upstream of the elbow portion 15, a constricted portion 16 having a reduced inner diameter of the transport pipe 11 is formed.
この絞り部１６は、下流側ほど縮径する縮径テーパ部１７と下流側ほど拡径する拡径テーパ部１８とが連なるようにして形成されている。絞り部１６の内径は、好ましくは鉛直部１３の内径の１／３〜２／３に設定される。絞り部１６の内径が鉛直部１３の内径の１／３より小さい場合には、ガスの流れが急激に規制され、圧損が大きくなるとともに、所要のガス流量が得られ難くなって好ましくない。その一方、絞り部１６の内径が鉛直部１３の内径の２／３より大きい場合には、絞り部１６によってガス中に含まれる異物を絞りの中心部へ十分に集めることが難しくなり、異物の捕集率が低下して好ましくない。 The narrowed portion 16 is formed such that a diameter-reduced taper portion 17 that decreases in diameter toward the downstream side and a diameter-expanded taper portion 18 that increases in diameter toward the downstream side are connected. The inner diameter of the throttle portion 16 is preferably set to 1/3 to 2/3 of the inner diameter of the vertical portion 13. When the inner diameter of the throttle portion 16 is smaller than １ ／ of the inner diameter of the vertical portion 13, the gas flow is abruptly restricted, the pressure loss increases, and it becomes difficult to obtain a required gas flow rate. On the other hand, when the inner diameter of the throttle portion 16 is larger than 2/3 of the inner diameter of the vertical portion 13, it becomes difficult for the throttle portion 16 to sufficiently collect foreign substances contained in the gas in the central portion of the throttle. The collection rate decreases, which is not preferable.
前記鉛直部１３及び水平部１４の内径は例えば１９１ｍｍ、絞り部１６の内径は例えば１４３ｍｍに設定される。この場合、絞り部１６の内径は鉛直部１３の内径の約２／３である。また、縮径テーパ部１７及び拡径テーパ部１８の長さは、例えば１５０ｍｍに設定される。さらに、水平部１４の中心から絞り部１６までの長さは、例えば２２８ｍｍに設定される。 The inner diameter of the vertical portion 13 and the horizontal portion 14 is set to 191 mm, for example, and the inner diameter of the throttle portion 16 is set to 143 mm, for example. In this case, the inner diameter of the throttle portion 16 is about 2/3 of the inner diameter of the vertical portion 13. The lengths of the reduced diameter tapered portion 17 and the enlarged diameter tapered portion 18 are set to 150 mm, for example. Furthermore, the length from the center of the horizontal part 14 to the aperture | diaphragm | squeeze part 16 is set, for example to 228 mm.
そして、天然ガスの流量は、例えば３０〜５０Ｔ／ｈに設定される。流量が３０Ｔ／ｈのときには、絞り部１６の上流側での流速が１２ｍ／ｓであるのに対し、絞り部１６の下流側での流速が２２ｍ／ｓとなって２倍近くに達する。流量が５０Ｔ／ｈのときには、絞り部１６の上流側での流速が２１ｍ／ｓであるのに対し、絞り部１６の下流側での流速が３７ｍ／ｓとなって２倍近くまで達する。従って、天然ガスの流速は、１０〜４０ｍ／ｓであることが好ましい。 And the flow volume of natural gas is set to 30-50 T / h, for example. When the flow rate is 30 T / h, the flow rate on the upstream side of the throttle unit 16 is 12 m / s, whereas the flow rate on the downstream side of the throttle unit 16 is 22 m / s, which is nearly double. When the flow rate is 50 T / h, the flow velocity on the upstream side of the throttle portion 16 is 21 m / s, whereas the flow velocity on the downstream side of the throttle portion 16 is 37 m / s, reaching nearly twice. Therefore, the natural gas flow rate is preferably 10 to 40 m / s.
前記エルボ部１５の下流側で鉛直部１３の延長方向には、ガス中の異物を捕集する異物捕集部１９が設けられている。この異物捕集部１９の入口側には開閉バルブ２０が取付けられ、異物捕集部１９の入口を開閉できるようになっている。なお、異物捕集部１９には図示しない排出口が設けられ、異物捕集部１９内に溜まった異物を外部へ排出できるようになっている。 A foreign substance collecting part 19 for collecting foreign substances in the gas is provided in the extending direction of the vertical part 13 on the downstream side of the elbow part 15. An opening / closing valve 20 is attached to the entrance side of the foreign matter collection unit 19 so that the entrance of the foreign matter collection unit 19 can be opened and closed. In addition, the foreign material collection part 19 is provided with the discharge port which is not shown in figure, and the foreign material collected in the foreign material collection part 19 can be discharged | emitted outside.
前記水平部１４の下流側には、図１の二点鎖線に示すストレーナ１２が接続されている。このストレーナ１２には図示しないフィルタが内蔵され、水平部１４を流れるガス中から異物を濾過、分離するようになっている。 A strainer 12 shown by a two-dot chain line in FIG. 1 is connected to the downstream side of the horizontal portion 14. The strainer 12 incorporates a filter (not shown) so as to filter and separate foreign substances from the gas flowing through the horizontal portion 14.
前記異物としては、輸送配管１１内面の酸化によって形成される酸化鉄のほか、砂、塵、埃等の固形物が挙げられる。この異物の平均粒子径は１０〜４００μｍ程度であり、通常１００〜４００μｍである。異物の平均粒子径が１０μｍより小さい場合には、異物が極微小で飛散しやすいため、異物を捕集することが難しくなる。一方、異物の平均粒子径が４００μｍより大きい場合には、エルボ部１５の下流側に位置するストレーナ１２等の負荷が大きくなるため好ましくない。 Examples of the foreign matter include iron oxide formed by oxidation of the inner surface of the transport pipe 11 and solid substances such as sand, dust, and dust. The average particle diameter of this foreign material is about 10 to 400 μm, and is usually 100 to 400 μm. When the average particle diameter of the foreign matter is smaller than 10 μm, the foreign matter is extremely small and easily scattered, so that it is difficult to collect the foreign matter. On the other hand, when the average particle diameter of the foreign matter is larger than 400 μm, the load on the strainer 12 and the like located on the downstream side of the elbow part 15 is increased, which is not preferable.
この第１実施形態における輸送配管１１中の異物の除去装置は、鉛直部１３の縮径テーパ部１７、絞り部１６、拡径テーパ部１８、異物捕集部１９等により構成されている。
次に、前記のように構成された輸送配管１１中の異物の除去装置について作用を説明する。
The apparatus for removing foreign matter in the transport pipe 11 according to the first embodiment includes a reduced diameter tapered portion 17, a throttle portion 16, an enlarged diameter tapered portion 18, a foreign matter collecting portion 19, and the like of the vertical portion 13.
Next, the operation of the apparatus for removing foreign matter in the transport pipe 11 configured as described above will be described.
図２の矢印に示すように、異物Ｓを含む天然ガスは輸送配管１１中を流れ、鉛直部１３を下降してエルボ部１５で９０度方向を転換して水平部１４へと流れる。このとき、天然ガス中に分散されている異物Ｓは、鉛直部１３に設けられた絞り部１６において、その縮径テーパ部１７で配管の中心部へ集められる。同時に、鉛直部１３を流れるガスは、絞り部１６で絞られてその流速が前述のように２倍近くに達する。そして、縮径テーパ部１７で絞られたガスの流れは拡径テーパ部１８で徐々に拡径されることから、乱流の発生が抑えられた状態で流れる。 As shown by the arrows in FIG. 2, the natural gas containing the foreign matter S flows through the transport pipe 11, descends the vertical portion 13, changes the direction by 90 degrees at the elbow portion 15, and flows to the horizontal portion 14. At this time, the foreign matter S dispersed in the natural gas is collected in the central portion of the pipe by the reduced diameter taper portion 17 in the throttle portion 16 provided in the vertical portion 13. At the same time, the gas flowing through the vertical portion 13 is throttled by the throttle portion 16 and the flow velocity reaches nearly twice as described above. The gas flow constricted by the diameter-reduced taper portion 17 is gradually expanded in diameter by the diameter-expanded taper portion 18 and flows in a state where generation of turbulent flow is suppressed.
従って、配管の中心位置の絞り部１６へ集められた異物Ｓは、拡散することなく、慣性力によりそのまま真っ直ぐに下降する。そして、その異物Ｓは水平部１４へ流れることなく、異物捕集部１９へ流れ込んで捕集されるとともに、天然ガスはエルボ部１５から水平部１４へ流れる。その後、異物捕集部１９に異物Ｓが一定量溜まると、排出口から外部へ取り出される。 Accordingly, the foreign matter S collected at the throttle portion 16 at the center position of the pipe does not diffuse and falls straight as it is due to the inertial force. The foreign matter S does not flow to the horizontal portion 14 but flows into the foreign matter collecting portion 19 and is collected, and natural gas flows from the elbow portion 15 to the horizontal portion 14. Thereafter, when a certain amount of foreign matter S accumulates in the foreign matter collecting portion 19, it is taken out from the discharge port.
ここで、非圧縮性流体の乱流モデルの一般的な計算法により、この第１実施形態の除去装置の効果を確認した。すなわち、非圧縮性流体の流量が５０ｔ／ｈと３０ｔ／ｈの場合について計算を行った。その結果、非圧縮性流体の流量が５０ｔ／ｈの場合には、第１実施形態の絞り部１６（絞り部＋エルボ）を設けたときには、平均粒子径１００〜４００μｍの異物Ｓの捕集率は８８．０％で十分に高く、圧損は１０．５ｋＰａで良好であった。これに対し、絞り部１６を設けないとき（エルボのみ）には、捕集率は６３．７％で不十分であり、圧損は８．６ｋＰａであった。さらに、絞り部１６の縮径テーパ部１７を設け、拡径テーパ部１８を設けることなく、縮径テーパ部１７の最小径の直管を接続したとき（レジューサ＋エルボ）には、捕集率は６５．９％で不十分であり、圧損は３０．２ｋＰａで急に上昇した。これらの結果を表１にまとめた。 Here, the effect of the removal device of the first embodiment was confirmed by a general calculation method of a turbulent model of an incompressible fluid. That is, the calculation was performed when the flow rate of the incompressible fluid was 50 t / h and 30 t / h. As a result, when the flow rate of the incompressible fluid is 50 t / h, the collection rate of the foreign matter S having an average particle diameter of 100 to 400 μm is provided when the throttle portion 16 (throttle portion + elbow) of the first embodiment is provided. Was sufficiently high at 88.0%, and the pressure loss was good at 10.5 kPa. On the other hand, when the throttle portion 16 was not provided (only the elbow), the collection rate was insufficient at 63.7%, and the pressure loss was 8.6 kPa. Further, when the straight pipe having the minimum diameter of the reduced diameter taper portion 17 is connected without providing the reduced diameter taper portion 17 of the throttle portion 16 and without providing the enlarged diameter taper portion 18 (reducer + elbow), the collection rate Was insufficient at 65.9%, and the pressure loss increased rapidly at 30.2 kPa. These results are summarized in Table 1.
（１）第１実施形態の除去装置では、エルボ部１５の上流側でエルボ部１５に近接する鉛直部１３には絞り部１６が設けられ、エルボ部１５の下流側で鉛直部１３の延長方向には異物捕集部１９が設けられている。このため、配管の鉛直部１３に絞り部１６を設けるとともに、鉛直部１３の延長方向に異物捕集部１９を設けるという簡単な構造で異物Ｓの捕集を行うことができる。この場合、鉛直部１３内の異物Ｓは全体に分散された状態にあるが、絞り部１６に到ると絞りの中心部に収束され、その状態で慣性力により真っ直ぐに流れて異物捕集部１９に捕集される。従って、異物Ｓの捕集率を５０％以上、好ましくは７５％以上に高めることができる。
(1) In the removal apparatus of the first embodiment, the throttle part 16 is provided in the vertical part 13 close to the elbow part 15 on the upstream side of the elbow part 15, and the extending direction of the vertical part 13 on the downstream side of the elbow part 15. Is provided with a foreign matter collecting section 19. For this reason, it is possible to collect the foreign matter S with a simple structure in which the throttle portion 16 is provided in the vertical portion 13 of the pipe and the foreign matter collecting portion 19 is provided in the extending direction of the vertical portion 13. In this case, the foreign matter S in the vertical portion 13 is in a state of being dispersed throughout, but when it reaches the throttle portion 16, it is converged to the central portion of the throttle and in that state flows straight due to inertial force and the foreign matter collecting portion. Collected by 19th. Therefore, the collection rate of the foreign matter S can be increased to 50% or more, preferably 75% or more.
よって、第１実施形態の異物Ｓの除去装置によれば、簡易な構成で、ガス中の異物Ｓを効率良く捕集し、分離、除去することができるという効果を奏する。
（２）前記輸送配管１１は円筒状に形成され、絞り部１６は下流側ほど縮径する縮径テーパ部１７と下流側ほど拡径する拡径テーパ部１８とが連なるようにして形成されている。このため、ガス中に含まれる異物Ｓを縮径テーパ部１７のテーパにより絞り部１６へ収束させることができ、ガスの乱流を抑制し、その状態で異物Ｓを異物捕集部１９へ効率的に導くことができる。
（３）前記絞り部１６の内径は、鉛直部１３の内径の１／３〜２／３に設定される。従って、ガス中の異物Ｓを配管中心部の絞り部１６へ導いて、捕集効率を高めることができる。
（４）前記ガスは燃料ガスであり、異物Ｓは酸化鉄を含有するものである。そのため、配管内面の酸化により生成した酸化鉄を含む異物Ｓを捕集し、燃料ガスを円滑に輸送することができる。
（５）前記異物Ｓの平均粒子径は１０〜４００μｍである。このため、ガス中の異物Ｓを鉛直部１３の絞り部１６により、配管中心部への収束を進めて捕集することができる。
（６）前記燃料ガスの流速は、１０〜４０ｍ／ｓである。従って、燃料ガス中の異物Ｓを前述のように捕集することにより、異物Ｓの堆積によるストレーナの急激な差圧上昇が発生することなく、大量の燃料ガスを円滑に輸送することができる。
（第２実施形態）
次に、本発明を具体化した第２実施形態を図３及び図４に基づいて説明する。なお、この第２実施形態では、主に前記第１実施形態と相違する部分について説明し、重複する部分について説明を省略する。
Therefore, according to the foreign substance S removing apparatus of the first embodiment, there is an effect that the foreign substance S in the gas can be efficiently collected, separated and removed with a simple configuration.
(2) The transport pipe 11 is formed in a cylindrical shape, and the throttle portion 16 is formed such that a diameter-reduced taper portion 17 whose diameter decreases toward the downstream side and a diameter-diameter taper portion 18 whose diameter increases toward the downstream side are connected. Yes. For this reason, the foreign substance S contained in the gas can be converged to the throttle part 16 by the taper of the reduced diameter taper part 17 to suppress the turbulent flow of gas, and in this state, the foreign substance S is efficiently transferred to the foreign substance collection part 19. Can be guided.
(3) The inner diameter of the throttle portion 16 is set to 1/3 to 2/3 of the inner diameter of the vertical portion 13. Therefore, the foreign matter S in the gas can be guided to the throttle portion 16 at the center of the pipe, thereby increasing the collection efficiency.
(4) The gas is a fuel gas, and the foreign matter S contains iron oxide. Therefore, the foreign substance S containing the iron oxide produced | generated by the oxidation of piping inner surface is collected, and fuel gas can be conveyed smoothly.
(5) The average particle diameter of the foreign matter S is 10 to 400 μm. For this reason, the foreign substance S in the gas can be collected by the converging to the center of the pipe by the throttle portion 16 of the vertical portion 13.
(6) The flow rate of the fuel gas is 10 to 40 m / s. Therefore, by collecting the foreign matter S in the fuel gas as described above, a large amount of fuel gas can be transported smoothly without causing a rapid increase in the differential pressure of the strainer due to the accumulation of the foreign matter S.
(Second Embodiment)
Next, a second embodiment embodying the present invention will be described with reference to FIGS. In the second embodiment, portions that are different from the first embodiment will be mainly described, and description of overlapping portions will be omitted.
図４（ａ）に示すように、絞り部１６の各部位における異物Ｓの平均粒子径（μｍ）と捕集率（％）との関係を、一般的な乱流モデルの計算により求めた。すなわち、図４（ｂ）に示すように、前記第１実施形態の除去装置において、絞り部１６を６区画に区分し、各区画に位置する異物Ｓの捕集率を測定した。乱流モデルの計算では、非圧縮性流体で、ガスの流量を５０ｔ／ｈとしてＲＳＭモデルにて計算した。 As shown in FIG. 4A, the relationship between the average particle diameter (μm) of the foreign matter S and the collection rate (%) in each part of the throttle portion 16 was obtained by calculation of a general turbulent model. That is, as shown in FIG. 4B, in the removing device of the first embodiment, the throttle portion 16 was divided into six sections, and the collection rate of the foreign matter S located in each section was measured. In the calculation of the turbulent flow model, the RSM model was used for the incompressible fluid with the gas flow rate set to 50 t / h.
その結果、水平部１４から離れた区画〔図４（ａ）の△印、◇印及び□印〕の方が水平部１４に近い区画〔図４（ａ）の×印、＊印及び○印〕よりも異物Ｓの捕集率が高くなった。また、絞り部１６の中心側〔図４（ａ）の△印又は×印〕の方が外周側〔図４（ａ）の◇印又は○印〕より異物Ｓの捕集率が高くなる結果が得られた。 As a result, the section away from the horizontal portion 14 (Δ mark, ◇ mark and □ mark in FIG. 4A) is closer to the horizontal portion 14 [X mark, * mark and ○ mark in FIG. 4A. ], The collection rate of the foreign matter S was higher. Further, the collection rate of the foreign matter S is higher on the center side of the narrowed portion 16 (Δ mark or X mark in FIG. 4A) than on the outer peripheral side (◇ mark or ○ mark in FIG. 4A). was gotten.
そこで、図３（ａ）及び（ｂ）に示すように、絞り部１６を偏心構造とした。すなわち、絞り部１６の中心を鉛直部１３の中心から、水平部１４とは反対方向に離れる位置に設け、縮径テーパ部１７及び拡径テーパ部１８の傾斜角度を水平部１４側で小さく、その反対側で大きくなるように設定した。さらに、縮径テーパ部１７と拡径テーパ部１８との間の絞り部１６に一定長さの直管部２１を接続した。 Therefore, as shown in FIGS. 3A and 3B, the throttle portion 16 has an eccentric structure. That is, the center of the throttle portion 16 is provided at a position away from the center of the vertical portion 13 in the direction opposite to the horizontal portion 14, and the inclination angles of the reduced diameter tapered portion 17 and the enlarged diameter tapered portion 18 are reduced on the horizontal portion 14 side. It was set to be larger on the opposite side. Further, a straight pipe portion 21 having a predetermined length was connected to the throttle portion 16 between the reduced diameter tapered portion 17 and the enlarged diameter tapered portion 18.
さて、異物Ｓを含む天然ガスを輸送配管１１中に流すと、そのガスは鉛直部１３を下降してエルボ部１５から水平部１４へと流れる。このとき、天然ガス中の異物Ｓは、絞り部１６において、その縮径テーパ部１７で水平部１４から離れた絞り部１６へ集められる。同時に、鉛直部１３を流れるガスは、絞り部１６で絞られてその流速が速められる。 Now, when the natural gas containing the foreign substance S is caused to flow into the transport pipe 11, the gas descends the vertical portion 13 and flows from the elbow portion 15 to the horizontal portion 14. At this time, the foreign matter S in the natural gas is collected in the throttle portion 16 away from the horizontal portion 14 by the reduced diameter taper portion 17 in the throttle portion 16. At the same time, the gas flowing through the vertical part 13 is throttled by the throttle part 16 and the flow velocity is increased.
このため、偏心位置の絞り部１６へ集められた異物Ｓは、慣性力によりそのまま直管部２１を通って真っ直ぐに下降する。そして、異物Ｓは水平部１４へ流れることなく、異物捕集部１９へ流れ込んで捕集される。 For this reason, the foreign matter S collected in the throttle portion 16 at the eccentric position descends straight through the straight pipe portion 21 as it is due to the inertial force. The foreign matter S flows into the foreign matter collecting portion 19 and is collected without flowing into the horizontal portion 14.
従って、この第２実施形態によれば、絞り部１６の中心が鉛直部１３の中心より、水平部１４とは反対側に位置するように偏心されていることから、前記第１実施形態に比べて異物Ｓの捕集率を向上させることができる。 Therefore, according to the second embodiment, the center of the diaphragm portion 16 is decentered so as to be located on the opposite side of the horizontal portion 14 with respect to the center of the vertical portion 13, so that it is compared with the first embodiment. Thus, the collection rate of the foreign matter S can be improved.
なお、前記各実施形態を次のように変更して具体化することも可能である。
・ 図５（ａ）に示すように、前記第１実施形態の絞り部１６において、縮径テーパ部１７と拡径テーパ部１８との接続部分を断面円弧部２２としてもよい。この場合には、絞り部１６を流れるガスの流れを円滑にして、ガスの輸送を安定した状態で行うことができる。
It should be noted that the embodiments described above can be modified and embodied as follows.
As shown in FIG. 5A, in the narrowed portion 16 of the first embodiment, a connection portion between the reduced diameter tapered portion 17 and the enlarged diameter tapered portion 18 may be a cross-sectional arc portion 22. In this case, the flow of the gas flowing through the throttle portion 16 can be made smooth and the gas can be transported in a stable state.
・ 図５（ｂ）に示すように、前記第１実施形態の絞り部１６において、縮径テーパ部１７と拡径テーパ部１８との間に直管部２１を設けてもよい。この場合、縮径テーパ部１７で収束された異物Ｓが絞られた径で直管部２１を下降し、その慣性力で異物捕集部１９へ到る。従って、絞り部１６に収束された異物Ｓの流れを安定化させることができる。 -As shown in FIG.5 (b), in the aperture | diaphragm | squeeze part 16 of the said 1st Embodiment, you may provide the straight pipe part 21 between the diameter-reduction taper part 17 and the diameter-expansion taper part 18. FIG. In this case, the straight pipe portion 21 is lowered with the diameter of the foreign matter S converged by the reduced diameter taper portion 17 and reaches the foreign matter collecting portion 19 by its inertial force. Accordingly, it is possible to stabilize the flow of the foreign matter S converged on the throttle portion 16.
・ 前記第１実施形態の絞り部１６において、縮径テーパ部１７の傾斜角度と拡径テーパ部１８の傾斜角度を異なるように構成したり、絞り部１６を水平部１４にさらに近づけて構成したりしてもよい。 In the diaphragm portion 16 of the first embodiment, the inclination angle of the reduced diameter taper portion 17 and the inclination angle of the diameter expansion taper portion 18 are configured to be different, or the diaphragm portion 16 is configured to be closer to the horizontal portion 14. Or you may.
・ 前記縮径テーパ部１７の入口部分又は拡径テーパ部１８の出口部分を断面円弧状に形成してもよい。
・ 前記縮径テーパ部１７又は拡径テーパ部１８を断面円弧状、すなわち外側へ膨らむ断面円弧状又は内側へ膨らむ断面円弧状に形成してもよい。
-You may form the entrance part of the said diameter reduction taper part 17, or the exit part of the diameter expansion taper part 18 in a cross-sectional arc shape.
The diameter-reduced taper portion 17 or the diameter-enlarged taper portion 18 may be formed in a cross-section arc shape, that is, a cross-section arc shape that bulges outward or a cross-section arc shape that bulges inward.
１１…輸送配管、１３…鉛直部、１４…水平部、１５…エルボ部、１６…絞り部、１７…縮径テーパ部、１８…拡径テーパ部、１９…異物捕集部、Ｓ…異物。 DESCRIPTION OF SYMBOLS 11 ... Transport piping, 13 ... Vertical part, 14 ... Horizontal part, 15 ... Elbow part, 16 ... Restriction part, 17 ... Diameter-reduction taper part, 18 ... Diameter expansion taper part, 19 ... Foreign material collection part, S ... Foreign material.
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