JP2007303783A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger, dispensing with an evaporation trap to prevent condensed water from staying in a heat exchange case. <P>SOLUTION: The heat exchange case 1 is connected to a steam supply pipe 2 through a steam ejector 6. A gas-liquid separating member 4 is connected to the downstream side of the heat exchange case 1 through a condensed water discharge pipe 3. A number of hollow long tubes 9 formed of a hydrophobic porous membrane are mounted in the gas-liquid separating member 4. A suction chamber 7 of a steam ejector 6 is connected to the upper part of the gas-liquid separating member 3 through a communication passage 15. A condensed water discharge pipe 13 is connected to the downstream side of the gas-liquid separating member 4. The steam from which heat is deprived by the heat exchanger 1 becomes condensed water to flow down with some of residual steam into the gas-liquid separating member 3. The steam separated by the gas-liquid separating member 4 is sucked into the steam ejector 6. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、蒸気を熱源として被加熱物を加熱する熱交換器に関する。   The present invention relates to a heat exchanger that heats an object to be heated using steam as a heat source.

従来の熱交換器は、多数のシリンダ・ドライヤに蒸気を供給する蒸気供給管と蒸気の凝縮した復水を排出する排出管をそれぞれ接続して、この蒸気供給管と復水排出管に蒸気分離器を介して接続し、それぞれの蒸気分離器に蒸気トラップを取り付けたもので、多数のシリンダ・ドライヤから確実に復水を排除することができるものである。ここで、蒸気トラップ（スチームトラップとも言う）とは、蒸気と復水の気液二相流体の内から復水だけを自動的に外部へ排出し、蒸気は外部へ排出することのない自動弁の一種である。 Conventional heat exchangers connect a steam supply pipe that supplies steam to a number of cylinders and dryers and a discharge pipe that discharges condensate with condensed steam, and separates the steam into this steam supply pipe and condensate discharge pipe. The steam separators are connected to the steam separators and steam traps are attached to the steam separators, so that the condensate can be surely eliminated from a large number of cylinders and dryers. Here, a steam trap (also called a steam trap) is an automatic valve that automatically discharges only condensate from the gas-liquid two-phase fluid of steam and condensate, and does not discharge steam to the outside. It is a kind of.

上記従来の熱交換器では、多数のシリンダ・ドライヤにそれぞれ略１台の蒸気トラップを取り付けているために、シリンダ・ドライヤの設置数に比例して蒸気トラップの取り付け台数も多くなり、シリンダ・ドライヤの駆動時間の経過と共に稼動部を有する蒸気トラップが故障してしまい、復水をシリンダ・ドライヤの内部から排出できなくなる問題があった。シリンダ・ドライヤの内部に復水を滞留すると、被加熱物への伝熱量が低下して、被加熱物の加熱ムラ、すなわち、被加熱物の品質の低下を来たしてしまうのである。
実開昭６０−４０４９９号公報 In the above conventional heat exchanger, since approximately one steam trap is attached to each of a large number of cylinders and dryers, the number of installed steam traps increases in proportion to the number of cylinders and dryers installed. As the drive time elapses, the steam trap having the operating part breaks down, and there is a problem that the condensate cannot be discharged from the inside of the cylinder dryer. If the condensate stays inside the cylinder / dryer, the amount of heat transferred to the object to be heated decreases, resulting in uneven heating of the object to be heated, that is, the quality of the object to be heated decreases.
Japanese Utility Model Publication No. 60-40499

解決しようとする課題は、稼動部を有する蒸気トラップの取り付けを不要として、蒸気トラップの故障をなくすことによって、シリンダ・ドライヤ等の熱交換容器内部での復水の滞留を防止することのできる熱交換器を得ることである。   The problem to be solved is that heat that can prevent the condensate from staying inside the heat exchange vessel such as a cylinder / dryer by eliminating the need for a steam trap having an operating part and eliminating the failure of the steam trap. To get an exchanger.

本発明は、熱交換容器に蒸気供給管と復水排出管を接続して、蒸気供給管から供給した蒸気で被加熱物を加熱すると共に、復水排出管から蒸気が熱を奪われて凝縮した復水を系外へ排出するものにおいて、復水排出管に蒸気は透過させるが液体は透過させない気液分離膜よりなる気液分離部材を配置して、当該気液分離部材に復水排除管を接続すると共に、蒸気供給管に蒸気エゼクタを介在して、当該蒸気エゼクタの吸引室と、気液分離部材の気体滞留部との間を、連通路によって連通したものである。   The present invention connects a steam supply pipe and a condensate discharge pipe to a heat exchange container, heats the object to be heated with the steam supplied from the steam supply pipe, and condenses the steam by removing heat from the condensate discharge pipe. In order to discharge the condensate out of the system, a gas-liquid separation member made of a gas-liquid separation membrane that allows vapor to permeate the condensate discharge pipe but does not allow liquid to permeate is disposed, and condensate is excluded from the gas-liquid separation member. In addition to connecting the pipe, a steam ejector is interposed in the steam supply pipe, and the suction chamber of the steam ejector and the gas retention part of the gas-liquid separation member are communicated with each other by a communication path.

本発明は、復水排出管に蒸気は透過させるが液体は透過させない気液分離部材を配置したことによって、この気液分離部材により蒸気と復水を分離して、復水を系外へ排除することができ、蒸気トラップを不要として、蒸気トラップの故障に伴う熱交換容器内部での復水の滞留を防止することができる。   In the present invention, a vapor-liquid separation member that allows vapor to permeate through the condensate discharge pipe but does not allow liquid to permeate is disposed, so that the vapor and condensate are separated by the gas-liquid separation member and the condensate is excluded from the system. It is possible to eliminate the need for the steam trap and prevent the condensate from staying inside the heat exchange vessel due to the failure of the steam trap.

蒸気エゼクタの吸引室と気液分離部材の気体滞留部との間を、連通路によって連通したことによって、蒸気エゼクタの吸引作用により熱交換容器内の蒸気の一部を強制的に循環対流させることができ、熱交換容器での伝熱効率を向上させることができる。   By connecting between the suction chamber of the steam ejector and the gas retention part of the gas-liquid separation member via the communication path, a part of the steam in the heat exchange vessel is forced to circulate and convection by the suction action of the steam ejector. The heat transfer efficiency in the heat exchange container can be improved.

気液分離部材を構成する気液分離膜は、従来から膜蒸留法などで使用されている疎水性多孔質膜を用いることができる。   As the gas-liquid separation membrane constituting the gas-liquid separation member, a hydrophobic porous membrane conventionally used in a membrane distillation method or the like can be used.

図１において、被加熱物と熱交換する熱交換容器１と、熱交換容器１へ蒸気を供給する蒸気供給管２と、蒸気供給管２に介在した蒸気エゼクタ６と、熱交換容器１内の復水を排出する復水排出管３と、復水排出管３に接続した気液分離部材４、及び、気液分離部材４の下流側に接続した復水排除管１３とで熱交換器を構成する。   In FIG. 1, a heat exchange container 1 for exchanging heat with an object to be heated, a steam supply pipe 2 for supplying steam to the heat exchange container 1, a steam ejector 6 interposed in the steam supply pipe 2, and a heat exchange container 1 A heat exchanger includes a condensate discharge pipe 3 for discharging condensate, a gas-liquid separation member 4 connected to the condensate discharge pipe 3, and a condensate discharge pipe 13 connected to the downstream side of the gas-liquid separation member 4. Constitute.

蒸気供給管２には、熱交換容器１へ供給する蒸気圧力を所定値に制御するための制御弁５及び蒸気エゼクタ６を取り付ける。蒸気エゼクタ６は、ノズルを内蔵した吸引室７とディフューザ８とで構成して、内部を蒸気が高速で流下することによって、吸引室７で所定の吸引力を発生するものである。 A control valve 5 and a steam ejector 6 are attached to the steam supply pipe 2 for controlling the steam pressure supplied to the heat exchange vessel 1 to a predetermined value. The steam ejector 6 includes a suction chamber 7 having a nozzle and a diffuser 8, and generates a predetermined suction force in the suction chamber 7 by causing steam to flow down at a high speed.

熱交換容器１は本実施例においては円筒状タンクの間接式熱交換器であって、熱交換容器１内に蒸気供給管２を螺旋状に配置して、その下端部を復水排出管３と接続する。熱交換容器１内の図示しない被加熱物を、蒸気供給管２から供給する高温蒸気によって所定温度まで加熱するものであり、被加熱物に熱を奪われて凝縮した復水と残留蒸気の一部は、復水排出管３から下流側へ排出されるものである。 The heat exchange container 1 is an indirect heat exchanger of a cylindrical tank in the present embodiment, and a steam supply pipe 2 is arranged in a spiral shape in the heat exchange container 1, and a lower end portion thereof is a condensate discharge pipe 3. Connect with. A heated object (not shown) in the heat exchange container 1 is heated to a predetermined temperature by high-temperature steam supplied from the steam supply pipe 2. The section is discharged from the condensate discharge pipe 3 to the downstream side.

気液分離部材４は、疎水性多孔質膜からなる中空長尺チューブ９を、縦方向に多数本取り付けて、復水排出管３と接続した入口通路１０を中空長尺チューブ９の中空部１１の上端部と連通する。チューブ９は中空部１１と気液分離部材４の内部とを連通する微小な細孔１２を多数有するもので、この細孔１２は、気体としての蒸気は透過するが液体としての復水は透過しないものである。なお、図１においては、チューブ９と細孔１２を理解し易くするためにやや誇張して記載したものである。中空長尺チューブ９の中空部１１の下端部は、気液分離部材４の出口通路１４と連通し、この出口通路１４を復水排除管１３と接続する。また、復水排除管１３には、弁開度を任意に調節することのできる絞り弁１７を取り付ける。   The gas-liquid separation member 4 has a plurality of hollow long tubes 9 made of a hydrophobic porous membrane attached in the vertical direction, and the inlet passage 10 connected to the condensate discharge pipe 3 is connected to the hollow portion 11 of the hollow long tube 9. It communicates with the upper end of the. The tube 9 has a large number of minute pores 12 communicating between the hollow portion 11 and the inside of the gas-liquid separation member 4. The pores 12 transmit vapor as gas but transmit condensate as liquid. It is something that does not. In FIG. 1, the tube 9 and the pores 12 are exaggerated for easy understanding. The lower end portion of the hollow portion 11 of the hollow long tube 9 communicates with the outlet passage 14 of the gas-liquid separation member 4, and connects the outlet passage 14 to the condensate rejection pipe 13. The condensate discharge pipe 13 is provided with a throttle valve 17 that can arbitrarily adjust the valve opening.

気液分離部材４内の上部と蒸気エゼクタ６の吸引室とを連通路１５で連通する。気液分離部材４の内部、すなわち、中空チューブ９の外周部分が、気液分離部材の気体滞留部を構成する。気液分離部材４内の下部を管路１６によって復水排除管１３と接続する。   The upper part in the gas-liquid separation member 4 and the suction chamber of the steam ejector 6 are communicated with each other through a communication passage 15. The inside of the gas-liquid separation member 4, that is, the outer peripheral portion of the hollow tube 9 constitutes a gas retention part of the gas-liquid separation member. The lower part in the gas-liquid separation member 4 is connected to the condensate rejection pipe 13 by a pipe line 16.

蒸気供給管２から熱交換容器１へ供給される蒸気によって被加熱物は加熱され、熱を奪われて凝縮した復水と一部の残留蒸気は、復水排出管３から気液分離部材４の中空長尺チューブ９の中空部１１内へ流下する。ここで、蒸気及び復水から再蒸発した再蒸発蒸気は、細孔１２を透過して気液分離部材４内に溜まり、連通路１５から蒸気エゼクタ６に吸引されて、再度熱交換容器１へ供給される。このように、熱交換容器１内の一部の蒸気及び再蒸発蒸気を、蒸気エゼクタ６の吸引作用によって強制的に循環対流させることによって、熱交換容器１での伝熱効率を向上させることができる。   The object to be heated is heated by the steam supplied from the steam supply pipe 2 to the heat exchange vessel 1, and the condensed condensate and a part of the residual steam are removed from the condensate discharge pipe 3 through the gas-liquid separation member 4. The hollow long tube 9 flows down into the hollow portion 11. Here, the re-evaporated steam re-evaporated from the steam and the condensate passes through the pores 12 and accumulates in the gas-liquid separation member 4, is sucked into the steam ejector 6 from the communication path 15, and returns to the heat exchange container 1 again. Supplied. As described above, the heat transfer efficiency in the heat exchange container 1 can be improved by forcibly circulating and convection a part of the steam and re-evaporated steam in the heat exchange container 1 by the suction action of the steam ejector 6. .

中空長尺チューブ９の中空部１１内で再蒸発することによって温度の低下した復水は、出口通路１４と絞り弁１７と復水排除管１３から系外へ排除される。また、気液分離部材４内で凝縮した復水は、管路１６を通って復水排除管１３から系外へ排除される。 Condensate whose temperature has decreased due to re-evaporation in the hollow portion 11 of the hollow long tube 9 is excluded from the system through the outlet passage 14, the throttle valve 17, and the condensate discharge pipe 13. Further, the condensed water condensed in the gas-liquid separating member 4 passes through the conduit 16 and is discharged out of the system from the condensed water exclusion pipe 13.

このように、気液分離部材４を配置したことによって、蒸気トラップを取り付ける必要がなくなり、蒸気トラップの故障に伴う復水排出不良もなくなることにより、熱交換容器１での復水の滞留を防止することができる。 In this way, the arrangement of the gas-liquid separation member 4 eliminates the need to attach a steam trap, and eliminates condensate discharge defects due to the failure of the steam trap, thereby preventing condensate retention in the heat exchange vessel 1. can do.

本発明の熱交換器の実施例を示す一部断面構成図。The partial cross section block diagram which shows the Example of the heat exchanger of this invention.

符号の説明Explanation of symbols

１ 熱交換容器
２ 蒸気供給管
３ 復水排出管
４ 気液分離部材
５ 制御弁
６ 蒸気エゼクタ
７ 吸引室
９ 中空長尺チューブ
１０ 入口通路
１１ 中空部
１２ 細孔
１３ 復水排除管
１４ 出口通路
１５ 連通路
DESCRIPTION OF SYMBOLS 1 Heat exchange container 2 Steam supply pipe 3 Condensate discharge pipe 4 Gas-liquid separation member 5 Control valve 6 Steam ejector 7 Suction chamber 9 Hollow long tube 10 Inlet passage 11 Hollow part 12 Pore 13 Condensate exclusion pipe 14 Outlet passage 15 Communication path

Claims (1)

熱交換容器に蒸気供給管と復水排出管を接続して、蒸気供給管から供給した蒸気で被加熱物を加熱すると共に、復水排出管から蒸気が熱を奪われて凝縮した復水を系外へ排出するものにおいて、復水排出管に蒸気は透過させるが液体は透過させない気液分離膜よりなる気液分離部材を配置して、当該気液分離部材に復水排除管を接続すると共に、蒸気供給管に蒸気エゼクタを介在して、当該蒸気エゼクタの吸引室と、気液分離部材の気体滞留部との間を、連通路によって連通したことを特徴とする熱交換器。
A steam supply pipe and a condensate discharge pipe are connected to the heat exchange container to heat the object to be heated with the steam supplied from the steam supply pipe, and condensate from which the steam has been deprived of heat and condensed. When discharging out of the system, a vapor-liquid separation member made of a gas-liquid separation membrane that allows vapor to permeate through the condensate discharge pipe but does not allow liquid to pass through is disposed, and a condensate drain pipe is connected to the gas-liquid separation member. In addition, a heat exchanger characterized in that a steam ejector is interposed in the steam supply pipe, and the suction chamber of the steam ejector and the gas retention portion of the gas-liquid separation member are communicated with each other by a communication path.

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