WO1991000980A1

WO1991000980A1 - Multitubular heat exchanger

Info

Publication number: WO1991000980A1
Application number: PCT/JP1990/000882
Authority: WO
Inventors: Toujou Kamino
Original assignee: Sink Osangyo Kabushiki Kaisha
Priority date: 1989-07-11
Filing date: 1990-07-09
Publication date: 1991-01-24

Abstract

A multitubular heat exchanger, in which tube-end plates (3), (3') are provided on both sides of a cylindrical bushing (1), a plurality of fluid outgoing-returning small tubes (2) are laid in the bushing (1) while supported by the tube-end plates (3), (3'), and fluids are poured into the bushing (1) and small tubes (2) to be subjected to heat exchange therebetween. More than one pair of small-tube insertion holes, each pair comprising holes into which the fluid outgoing-returning small tubes (2) are respectively fitted, are provided to both tube-end plates (3), (3'); lids (4), (4') are provided outside the tube-end plates (3), (3'), respectively; and U-turn fluid passages (9), each comprising holes in the shape of U and circular at cross-section to connect fluid outgoing-returning small tubes in every pair to each other are provided to both lids (4), (4'). the U-turn fluid passages (9) allow the fluids in the fluid outgoing-returning small tubes (2) to flow smoothly without stagnation on account of the gravity and makes velocity distribution in the fluid passages uniform. Cleanability after heat exchanging is increased.

Description

Description Multi-tubular heat exchanger `` Technical field ''

The present invention relates to a multitubular heat exchanger, and more particularly, to more efficient heat exchange of a fluid such as a viscous fluid in a field such as Food Chemical Co., Ltd. or Fine Chemical, or a slurry containing solids. And a multi-tubular heat exchanger capable of smoothly discharging after heat exchange.

"Background technology"

There are various types of ripening exchangers, and the multitubular heat exchanger to which the present invention belongs employs means for increasing the heat transfer rate to improve ripening efficiency. In order to achieve this, various measures have been taken, such as enlarging the heat transfer area or causing the fluid as a heat medium or the heat exchange fluid to flow in a turbulent manner. Have been.

In addition, when the fluid to be heat-exchanged flows through the thin tube inside the sleeve, it is particularly necessary to clean the thin tube from the sanitary point of view. Something has been done.

However, in the conventional multi-tube heat exchanger described above, when the fluid to be heat-exchanged is passed through the thin tube, a means of using a floating tube plate is adopted from a sanitary point of view. The problem is that the fluid to be heat-exchanged stays in the thin tubes and becomes unsanitary, and even the floating tube plate must be taken out and cleaned each time, which is troublesome and troublesome. was there. In addition, in terms of heat exchange efficiency, not only the above-mentioned idle tube plate but also the fixed tube plate of the conventional multi-tube type matured heat exchanger may have a non-uniform flow path in a narrow tube. There was a problem that uniform heating and cooling were difficult.

Therefore, to address the problems discussed above, previously, it provided Kan扳on both sides of the ^r sleeve, shuttle a plurality of through both sides of the tube plate, a capillary for changing women bridged housed in cannula In a multi-tube heat exchanger in which a fluid is injected into the sheath tube and the thin tube so that the respective fluids exchange heat with each other, a pair of the return and return thin tubes are fitted to the two tube plates. A plurality of pairs of return / return capillary fitting holes are provided, and lids are respectively provided outside the two tube plates, and the pair of return / return capillary fitting holes are connected to the lids. A predetermined number of U-turn passages are formed, and the U-turn passages are formed so that the fluid flows down the return / return capillary sequentially without stagnation due to natural gravity. The proposed multi-tubular heat exchanger j has been proposed (see Japanese Utility Model Application No. 63-122 328). This multi-tube heat exchanger has a structure having a lid and a gasket as shown in FIGS. Here, Fig. 7a is a front view of the right cover, Fig. 7b is a cross-sectional view of the right cover, Fig. 7c is a front view of the left cover, and Fig. 7d is a cross-sectional view of the left cover. Fig. 8a is a front view of the gasket, and Fig. 8b is a cross-sectional view of the gasket. In other words, this multi-tube heat exchanger is formed with recesses 14, 14,... Connecting the pair of round-trip and return thin-tube fitting holes in the lids 13 and 13 ′. It is constructed so that it can flow down the return tube sequentially without stagnation due to natural gravity through the recess 14 .14 ... and the lids 13, 13 ′ The gasket 15 to be interposed between the tube plate (not shown) and the tube plate (not shown) has a structure in which a metal core plate 16 with rubber or the like on both sides is used. According to the multi-tubular heat exchanger having the lid, the heat exchange fluid flows down naturally and uniform heat exchange can be performed, so that the heat exchange efficiency can be improved. However, since the heat exchange fluid can be completely flown by the natural flow, it is easy to clean, and the heat exchanger can be sanitarily managed.

However, in the case of the multi-tubular heat exchanger with this configuration, after various tests and studies, the velocity distribution of the flow path tends to be uneven, and there is a problem in flowing a fluid containing solids. At the same time, it was found that there were some difficulties in handling and gasket processability.

The present invention has been made in view of the above-described problems, and has a new form The goal was to make the flow velocity distribution in the flow path uniform, improve its handling and gasket workability, improve heat exchange efficiency, and smoothly discharge after heat exchange. It is to provide a multitubular heat exchanger.

"Disclosure of the invention"

The shell-and-tube heat exchanger of the present invention as a means for achieving the above object is provided with tube sheets on both sides of a sleeve tube, and a plurality of round-trip / return thin tubes are sleeved through both tube plates. In a multi-tube heat exchanger in which a fluid is injected into the sheath tube and the thin tube so that the respective fluids exchange heat with each other, the two tube plates return to each other. Accordingly, a plurality of pairs of return and burnt thin fitting holes are provided, and lids are respectively provided outside the two tube plates, and the pair of return and return thin tube fitting holes are provided in the lids. A U-shaped flow path consisting of a U-shaped hole is provided to connect the fluid, and the U-shaped flow path is such that the fluid flows through the inside of the return / return capillary sequentially.

However, it is configured to flow down without stagnation due to natural gravity.

In addition, the multi-tubular heat exchanger of the present invention, in the above-described configuration, optionally has an uneven fitting portion on a joint surface between the tube sheet and the lid, and the fitting portion has a fitting protrusion. In addition, a gasket is interposed between the tube sheet and the lid, and the gasket is made of a corrosion-resistant metal such as mesh or plate stainless steel having the same shape as the tube sheets on both sides. The core plate may have a configuration in which rubber or the like is provided on both sides. Further, the joining surface between the tube sheet and the lid may be joined to metal surfaces, and a part of the outer periphery of the joining surface may be sealed with an O-ring or a square packing. Furthermore, the cross-sectional shape of the U-turn flow path formed in the lid is generally circular and has a U-turn shape in the lid, and the hole diameter is the same as the diameter of the fitting hole of the tube sheet. The configuration is as follows.

The multitubular heat exchanger according to the present invention based on the above configuration is configured such that, for example, a heat exchange fluid for food production is injected into a thin tube accommodated in a sheath tube, and a heat medium or a refrigerant is injected into the sheath tube. When the fluid is injected, the heat-exchanged fluid is stored in the jacket tube. ・ The multiple thin tubes installed inside flow sequentially from the upper tube to the lower tube. The fluid flows smoothly downward without discharging, and is discharged from the outlet. Therefore, the heat exchange fluid acts to be ripened (cooled) by the heat medium (refrigerant) in the sleeve. In addition, since the heat exchange fluid does not bun in the middle of the thin tube as described above, it works hygienically.

Further, the cross-sectional shape of the pattern passage formed in the lid is U-turned in the lid, and the diameter of the hole is the same as the diameter of the fitting hole of the tube sheet. Each cross section of the U-turn flow path is the same as the hole diameter of the tube sheet, and all cross sections are R-shaped, so that the velocity distribution of each flow path is constant, and in particular, the fluid containing solids is made uniform. It works so that it can flow. Therefore, when the process fluid is completely drained after the operation is completed, the effect of the fluid extruder big sponge ball used for cleaning the flow path, etc. is improved, and the efficiency of the entire process using this heat exchanger is improved! In addition, the economical efficiency and the cleanability are improved, and the sanitary property can be improved. Further, the processing of the gasket used between the tube sheet and the lid is facilitated, and at the same time, it is possible to prevent the gasket from protruding into the fluid flow path and the gasket from being displaced.

"Brief description of the drawings"

1 to 5 show an embodiment of the present invention, FIG. 1 is a partially omitted cross-sectional view, FIG. 2a is a right side view, FIG. 2b is a left side view, and FIG. 3a Fig. 3b is a front view of the left tube sheet, Fig. 4a is an internal front view of the right cover, Fig. 4b is a cross-sectional view of the right cover, 4 c is an internal front view of the left lid, d is a cross-sectional view of the left-turning lid, FIG. 5 a is a front view of the gasket, b is a cross-sectional view of the gasket and g, FIG. 6 a, is a schematic cross-sectional view of a joint surface between a tube sheet and a lid body in another embodiment of the present invention, and FIGS. 7 and 8 show a cross section of the multi-tubular heat exchanger previously proposed by the present inventors; Fig. 7a is a front view of the right lid, Fig. 7b is a sectional view of the right lid, Fig. 7c is a front view of the left lid, Fig. 7 (I is the left side) Fig. 8a is a front view of the gasket, Fig. 8b is the gasket. FIG.

"Best mode for carrying out the invention" The shell-and-tube heat exchanger in the present embodiment is roughly divided into a sleeve tube 1, a heat transfer thin tube 2, tube plates 3, 3 'on both sides, lids 4, 4', and gaskets 5, 5 '. Is done.

The sleeve 1 is a cylindrical, horizontally long installation type, and is made of a corrosion-resistant material such as stainless steel. Further, a plurality of heat transfer thin tubes 2 for circulating a food fluid or the like to be subjected to heat exchange are disposed therein. In addition, a mature (cold) medium inlet 6 is provided at the upper part of the body of the sleeve 1, and a heat (cooled) medium outlet 6 ′ is provided at the lower part of the body. Introduced * Can be discharged.

The mature thin tube 2 disposed in the sleeve 1 is formed as a spiral tube made of a corrosion-resistant material such as stainless steel or titanium lining. That is, the heat transfer tube has a configuration in which a spiral concavity (groove) is provided inside the tube.

The reason why the helical tube 2 is used is to consider that a turbulent flow is caused in the fluid flowing in the tube to increase the overall heat transfer coefficient. Further, a spiral material or a stirring material is inserted into the heat transfer thin tube 2 as necessary. In this embodiment, a total of 18 pairs of the condensed thin tubes 2, 2 and ♦ are arranged in a pair for going back and forth and returning. The heat transfer tubes 2, 2 · · are bridged on both sides by tube sheets 3, 3 '.

The tubesheets 3 and 3 'have three holes at the uppermost stage, and in addition, four holes, five, four at the lower stage, and three holes at the lowermost stage. One of the uppermost ends of the tube sheet 3 forms a food fluid inlet hole 7 as a heat exchange fluid, and the lowermost end of the tube sheet 3 ′ has a food fluid outlet hole. 7 ′, and the remaining holes of the tube sheets 3 and 3 ′ form fitting holes 8, 8..., 8 8 ″. The lids 4 and 4 ′ are provided on the outside of the pipes 3 and 3 ′ so as to be freely opened and closed.

The lids 4 and 4 ′ are disposed on the left and right sides of the sleeve 1 so that they can be opened and closed via the opening and closing support portion 12 like a lid of a hatch, and are drilled in the tube sheets 3 and 3 ′. A pair of horizontal or inclined return / return mating holes 8, 8, or a pair of mating holes 8, 8 or 8 ', 8' A U-shaped hole 9 that forms a U-turn flow path through 8 'and 8' is formed inside the lids 4 and 4 '. The U-shaped hole 9 has a configuration in which the cross-sectional shape is a circular shape that turns inside the lids 4 and 4 ′, and the hole diameter is the same as the hole diameter of the fitting hole of the tube sheet. A 9mm hole is provided in the horizontal or diagonal direction to connect the return hole 8, 8 or 8 ', 8' with the lid 4, 4 'closed. The lid 4 on one side has a fluid inflow hole 7a that forms a flow path in conformity with the food fluid inlet hole 7, and the other lid 4 'has a flow path in conformity with the outlet hole 7'. A fluid outflow hole 7'a to be formed is provided. Further, a bottle 10 protrudes inward from the lids 4 and 4 ′ so that the lid 10 can be fitted into a bin hole 11 provided in the tube sheet 3 when the lid 4 is closed. . The gaskets 5, 5 'can be interposed between the tube sheets 3, 3' and the lids 4, 4 '.

The gaskets 5, 5 'are interposed between the tube sheets 3, 3' on both sides of the sleeve 1 and the lids 4, 4 ', and the gaskets 5, 5' are connected to the tube sheets 3, 3 'on both sides. Same — formed by an elastic body such as a rubber body

Then, when the viscous food fluid is introduced from the fluid inlet hole 7, the food fluid is fed into the uppermost thin tube 2 a, and the multi-tubular mature exchanger of the present embodiment is turned upside down. The thin tube 2b enters the narrow tube 2b at the 9-shaped U-shaped hole of the U-turn channel formed by the tube sheet 3 'and the body 4', and forms the opposite tube sheet 3 and lid 4 through the thin tube 2b. Into the narrow pipe 2c at the 9-shaped U-shaped underpass of the U-turn flow path, and naturally flows down the diagonally lower capillary 2d, and goes back and forth in the horizontal or diagonal order, and returns. As it flows, it is discharged from the lowermost exit hole 7 '. During this time, the food fluid acts to exchange heat with the heat medium introduced into the sleeve 1.

Further, since the cross-section of the U-turn flow passage 9 of the lids 4 and 4 ′ has the same diameter as the hole diameter of the pipes 扳 3 and 3 ′, the velocity distribution of each flow passage 9 becomes constant. It acts so that the contained fluid can flow uniformly. Therefore, when the process fluid is completely drained after the operation is completed, the effect of the fluid extrusion big and sponge balls used for cleaning the flow path is improved, and the efficiency of the entire process using this heat exchanger is improved. , Hypnosis, and cleaning The sanitary properties can be improved, and the processing of the gaskets 5, 5 'used between the tube sheets 3, 3' and the lids 4, 4 'becomes easy, and at the same time, the fluid Acts to prevent protrusion and displacement of the gaskets 5, 5 '.

It is apparent that the present invention is not limited to the above-described embodiment, but can be modified without departing from the scope of the present invention. Incidentally, the structure at the joint surface between the tube sheet and the lid may be a structure as shown in FIGS. 6a and 6b. In other words, a configuration may be adopted in which the metal surfaces are joined to each other without using a gasket on the joining surface, and a part of the outer periphery of the joining surface is sealed with an O-ring or a square packing. Further, in the above-described embodiment, the configuration has been described in which the food fluid inlet hole such as the food fluid for heat exchange and the food fluid outlet hole are respectively provided on different sides of the tube plate (lid). The U-turn flow path may have a cross-sectional shape.

However, the shape is not limited to a circular shape, and the shape may be changed according to the shape and the diameter of the fitting hole (round-trip ♦ return heat transfer pipe). Further, the U-turn channel may be formed as a recess, and the U-shaped search pipe may be arranged in the recess to form the channel. Further, as the gasket, a metal core plate having both sides lined with rubber or the like may be used, if necessary, similarly to the preceding example. In the case of this configuration, it may be used although there are difficulties in workability and handling. "Industrial applicability"

As is evident from the above description, according to the multiple heat exchanger of the present invention, the cross-sectional shape of the U-turn channel formed in the lid is a shape that makes a U-turn in the body, and Since the hole diameter is the same as the hole diameter of the fitting hole of the tube sheet, each cross section of the U-turn flow path is the same as the hole diameter of the tube sheet, and all cross sections are circular. This has the effect that the velocity distribution becomes constant, and in particular, the fluid containing solids can be flowed uniformly. In addition, when the process fluid is completely drained, the effect of the fluid extruded big ball used when flushing the flow path is improved, and the efficiency of the whole process is improved, the manufacturability, and the The gasket used between the tube sheet and the lid is easy to process, and at the same time, it protrudes into the fluid flow path and the gasket can be easily cleaned. This has the effect of preventing displacement.

Therefore, according to the present invention, the heat exchanged fluid flows down naturally and uniform heat exchange can be performed, so that the ripening exchange efficiency can be improved. It is possible to provide a multi-tubular heat exchanger that can be cleaned more easily because it can be completely washed down, and that can manage the heat exchanger in a sanitary manner.

Claims

The scope of the claims

(1) Tube plates are provided on both sides of the sleeve, and a plurality of return / return capillary tubes are arranged in the sleeve via the tube plates. In the multiple heat exchanger, heat is exchanged with each other, a plurality of pairs of return / return thin tube fitting holes are provided on both of the above-mentioned tube plates, each having a pair of return / return capillary fitting holes. A lid is provided outside each of the tube plates, and a predetermined number of U-turn flow paths, each of which is a U-shaped hole connecting the pair of return pipe fitting holes, are provided on the lid. The multi-tubular heat exchanger, wherein the U-turn flow path is formed so that the fluid flows down the return / return capillary sequentially without stagnation due to natural gravity.

(2) The multi-tubular heat exchanger according to claim 1, wherein the joint surface between the tube sheet and the lid has an uneven fitting portion, and the fitting portion has a fitting projection. Exchanger.

(3) A gasket is interposed between the tube sheet and the lid, and the gasket is a metal core plate made of a corrosion-resistant metal such as stainless steel or the like in the same shape as the tube sheets on both sides. 2. The multi-tubular heat exchanger according to claim 1, wherein both surfaces of the heat exchanger are lined with rubber or the like.

(4) The joint surface between the tube sheet and the lid is joined to metal surfaces, and a seal at an outer periphery of the joint surface is formed by a zero ring or a square packing. Multi-tube heat exchanger.

(5) The multi-tube type according to claim 1, wherein the U-shaped hole formed in the lid has a circular cross-sectional shape, and the hole diameter is the same as the hole diameter of the fitting hole of the tube sheet. Heat exchange