JP2012106202A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a crystal without any delay in manufacturing a crystal product using a heat exchanger and to prevent an entrance of a material from a blocking by deposition fixing of the crystal.SOLUTION: In the heat exchanger, a heat exchange is carried out via a cylinder 2 between a cooling medium circulating along the outer peripheral surface of the cylinder and the material sent inside the cylinder. The heat exchanger has a blade 65 scraping the crystal depositing by the heat exchange on the cylinder inner wall, and a pin 71 provided in the cylinder to disarrange the material. By providing such pin 71, a disrupting effect can be given to the material flowing in the cylinder. The disrupting effect is given to the material containing many scraped crystals, which can prevent the crystal to deposit or to join together to form a big lump. As the result, a flowability of the material in the cylinder is assured, the material flows in from the entrance smoothly, and is discharged from an outlet smoothly, and the crystal does not block the entrance.

Description

  The present invention relates to a technical field of a heat exchange device for performing heating or cooling using a heat exchange action, and more particularly to a heat exchange device for generating crystals from a flowable material containing a crystal component.

  At the manufacturing site of crystal products such as chemicals and viscous products such as miso, a heat exchange device as disclosed in Patent Document 1 is widely used. FIG. 7 shows a typical example of a conventional heat exchange device.

JP-A-2-59042

  7 includes a cylinder 2 provided with a shaft 6 therein, a jacket 4 for circulating a heat medium or a refrigerant along an outer wall surface of the cylinder, and a motor 8 that rotationally drives the shaft 6. Have. The shaft 6 is provided with a plurality of blades 64. When the shaft 6 rotates, the blades 64, 64... Rotate along the cylinder inner wall. The jacket 4 is packaged so as to surround the outer wall of the cylinder 2, and a space 45 for circulating a heat medium or a refrigerant is formed in the jacket 4.

  When a fluid material (raw material) is fed into the cylinder 2 using a pump and pushed into the area where the blades 64, 64... Rotate, the fluid material receives a heat exchange action on the inner wall surface of the cylinder, The boundary film of the exchanged part is scraped off by the tip portions of the rotary blades 64, 64. When used for heating, the heat exchanging device having such an action has an advantage of preventing the burning of the material and the influence of heat and the like, and when used for cooling, the material can prevent the material from clumping or freezing. Due to its advantages, it is widely used in industry.

  For example, when manufacturing a crystal product such as a medicine, the refrigerant is circulated through the inner space 45 through the supply port 41 and the discharge port 42 of the jacket 4 to cool the cylinder 2 from the outer wall side. On the other hand, from the raw material inlet 21 of the cylinder 2, a material containing a crystal component is pumped in. The material fed into the cylinder 2 undergoes a heat exchange action from the refrigerant in the jacket 4 through the cylinder, and crystallizes on the inner wall surface of the cylinder. The crystals deposited on the inner wall surface of the cylinder are scraped off by the rotating blades 64, 64... And are swept into the product outlet 22 as a slurry-like (grainy) fluid containing a large amount of the crystals. .

  The heat exchanger is also used when adding alcohol (preservative) in the finish cooling process of miso, which is a viscous product. Also in this case, the refrigerant is circulated through the inner space 45 through the supply port 41 and the discharge port 42 of the jacket 4 to cool the cylinder 2 from the outer wall side. On the other hand, heated miso and alcohol before finishing are fed from the raw material inlet 21 of the cylinder 2. These materials fed into the cylinder 2 are subjected to a heat exchange action on the inner wall surface of the cylinder and a scraping action by the blades 64, 64... 22 is discharged.

  Such heat exchange devices are recognized for their excellent effects and are widely used in various fields as described above. However, in the manufacture of crystal products such as chemicals, the following problems have arisen due to the “crystals” to be precipitated, and improvement has been strongly desired.

  In the manufacture of crystal products such as chemicals, crystallization and scraping are repeated in the cylinder, and the fluidity of the material in the cylinder is gradually lost. Eventually, a slurry-like (grainy) low-temperature low-flow material is pushed away to the product outlet while containing a large amount of crystals. When such a low-fluidity and cryogenic material reaches the vicinity of the product outlet beyond the last blade, crystals start to accumulate on the inner wall of the cylinder and the inner wall of the product outlet, and gradually accumulate. There is a problem of increasing the amount and eventually clogging the product outlet.

  In the manufacture of crystal products, in order to increase the crystal concentration of the fluid discharged from the product outlet, the discharged fluid may be re-entered from the raw material inlet and circulated. However, in the process of repeating the circulation, the crystal concentration increases and the fluid is supercooled, and there is a problem that the raw material inlet is blocked by the stuck and fixed crystals as in the case of the product outlet.

  As described above, when the raw material inlet and the product outlet are blocked by the precipitated crystals, it is necessary to stop the operation of the apparatus and remove the accumulated crystals. Therefore, in the production of crystal products, there are problems that the production efficiency is lowered due to repeated stoppage of the heat exchange device, and the work efficiency is lowered because the work of removing the crystals accumulated in the device is necessary.

  The above-mentioned problems of the prior art are unique problems that occur only when the heat exchange device is used for manufacturing a crystal product, and do not occur in the manufacture of other products. For example, in the above-described production of miso, the miso is only subjected to a cooling action by heat exchange, and crystals are not formed in the cooling process, so the above-described problem does not occur.

  In view of the above-mentioned problems of the prior art, the object of the present invention is to produce a crystal without fail in the production of a crystal product using a heat exchange device, and to close the material inlet / outlet. It is an object of the present invention to provide a heat exchange device that can smoothly and reliably flow in and out a material without the need to do so.

The object of the present invention described above is
A heat exchange device for exchanging heat between a fluid for heat exchange flowing along an outer peripheral surface of a cylinder and an object to be treated containing a crystal component fed into the cylinder through the cylinder. In an apparatus used for producing a crystal product from a processed product,
A cylinder that functions as a heat transfer body and circulates the workpiece inside;
A rotatable shaft provided in the cylinder;
A scraping member provided on the shaft, for scraping off crystals deposited by heat exchange on the inner wall of the cylinder;
A disturbance member provided in the cylinder for disturbing the workpiece containing the scraped crystal in the cylinder;
It is achieved by a heat exchange device having

  The disturbing member is composed of a pin, and is at least one standing on the shaft and / or the inner wall of the cylinder. A plurality of the pins may be erected in a comb shape on the shaft and the inner wall of the cylinder.

According to the present invention, not only the scraping member but also a disturbing member for disturbing the workpiece in the cylinder is provided in the cylinder.
By providing such a disturbing member, a disturbing action (an action of disturbing the object to be processed and preventing the formation of crystals and lump formation and ensuring fluidity) to the object to be processed flowing in the cylinder. Can be given. In this way, by giving a disturbing action to an object to be processed containing a large amount of scraped crystals, it is possible to prevent crystals from accumulating or forming crystals to form a large lump.
As a result, the fluidity of the object to be processed in the cylinder is ensured, and the object to be processed flows smoothly from the inlet and is discharged smoothly from the outlet.
Therefore, crystals do not accumulate on the inner wall near the inlet or the outlet of the cylinder, and the material inlet / outlet can be reliably prevented from being clogged.

It is a figure which shows the heat exchange apparatus which concerns on this invention. 2A is an enlarged cross-sectional view taken along the line aa in FIG. 1, and FIG. 2B is an enlarged cross-sectional view taken along the line bb in FIG. It is an enlarged view which shows the structure of the product exit side of the heat exchange apparatus shown in FIG. It is a figure which shows the modification of the heat exchange apparatus which concerns on this invention. It is sectional drawing along the cc line | wire of FIG. 4, Comprising: The state which is rotating the pin by the side of the shaft is shown. It is a figure which shows the other modification of the heat exchange apparatus which concerns on this invention. It is a figure which shows the conventional heat exchange apparatus.

Hereinafter, specific embodiments of the present invention will be described with reference to FIGS.
1 to 3 show typical examples of the embodiment of the present invention, and FIGS. 4 to 6 show modified examples.

(Configuration of heat exchange device)
The heat exchange apparatus of the present invention shown in FIGS. 1 to 3 circulates a heat exchange fluid (a heat medium or a refrigerant) along a cylinder 2 into which an object to be processed as a raw material is fed and an outer wall of the cylinder. And a shaft 6 provided coaxially in the cylinder 2 and a motor 8 that rotationally drives the shaft. On the outer peripheral surface of the shaft 6, a blade 65 that is a blade-like scraping member and a pin 71 that is a disturbance member are provided.

  In the present invention, the “object to be processed” is a fluid raw material that is heat-exchanged by a heat exchanger. The material to be treated is a raw material for depositing crystals (a flowable material containing a crystal component that is crystallized by heat exchange) and is not limited to one type, but two or more types of materials to be treated Are also sent at the same time.

  The cylinder 2 functions as a reaction container and a heat transfer body. At both ends of the cylinder 2, a raw material inlet 21 for continuously feeding raw materials to be processed, and a product outlet 22 from which the processed materials subjected to heat exchange are discharged as products Is provided. The material to be processed is fed into the raw material inlet 21 using a pressure pump. When fed into the cylinder 2, the workpiece is subjected to a heat exchange action in the heat exchange region 24 in the cylinder and is scraped by the rotating blades 65, 65. It is.

  A jacket 4 is provided on the outer periphery of the cylinder 2 so as to surround the cylinder outer wall. A cylindrical space 45 for circulating a heat exchange fluid (a heat medium or a refrigerant that exchanges heat with the object to be processed) is formed inside the jacket 4. Specific examples of the heat exchange fluid include a heat medium such as steam and hot water, and a refrigerant such as chilled water and brine.

  A cylindrical space 45 inside the jacket 4 is defined by a cylinder outer wall and a jacket inner wall. A heat exchange fluid flows into the cylindrical space 45 through the supply port 41, flows around the cylinder outer wall along the outer wall of the cylinder, is used for heat exchange, and is discharged from the discharge port 42. The heat exchange fluid undergoes heat exchange with the object to be processed in the cylinder via the cylinder 2 in the process of flowing through the space 45. In order to increase the heat exchange efficiency, it is possible to coat the jacket 4 with a heat insulating material as necessary.

  The shaft 6 includes a shaft main body 61 provided with a blade 65 and a pin 71, which will be described later, and rotating shafts 62 and 63 at both ends that are rotatably supported. The shaft body 61 is positioned so that both ends thereof face the raw material inlet 21 and the product outlet 22 of the cylinder 2, respectively. The rotating shafts 62 and 63 at both ends are rotatably supported by bearings (not shown) in a mechanically sealed state. One end of the shaft 6 is connected to the rotating shaft of the motor 8. A plurality of blades 65 (scraping members) are disposed on the outer periphery of the shaft 6 along the axial direction thereof. In the present invention, in addition to the blade 65, a plurality of pins 71 (disturbing members) for disturbing the material in the cylinder 2 are provided upright.

  In this embodiment, the plurality of blades 65, 65... Are provided in two rows in series in the shaft axial direction as shown in FIG. 1, and 180 in the circumferential direction as shown in the sectional view of FIG. Two rows are provided at intervals of °. The arrangement of the blades 65, 65... Is not limited to that shown in the figure, and for example, three or more blades may be provided. Alternatively, a plurality of blades may be arranged in a distributed manner instead of in a row.

  Each blade 65 is connected to a base 67 implanted in the shaft body 61 as shown in FIG. 2A, and each blade functions as a scraping member such as a scraper. While the shaft 6 is rotating, each blade 65 rotates together with the shaft along the inner wall of the cylinder 65 with the tip thereof being in contact with the inner wall of the cylinder 2.

  The object to be processed flowing in the heat exchange region 24 in the cylinder 6 undergoes heat exchange (rapid cooling action or rapid heat action) at a part in contact with the cylinder inner wall surface (heat transfer surface). The blades 65, 65... Another part of the object to be processed quickly flows into the space on the wall surface that has been scraped off, and the same heat exchange and scraping are performed again. Therefore, in the process in which the object to be processed flows in the heat exchange region 24 in the cylinder, partial heat exchange for the object to be processed and scraping for the part are continuously performed. Heat exchange is performed evenly.

  A plurality of pins 71 are erected at both ends of the shaft main body 61, and each pin functions as a disturbance member for disturbing the material. In the embodiment illustrated in FIGS. 1 to 3, a plurality of sets of a group of pins 71, 71... Arranged in series in a comb shape are provided. In the shaft portion between the raw material inlet 21 and the heat exchange region 24 (on the left end side of the shaft main body 61 in FIG. 1), as an example, comb-like pins 71, 71. Two sets are provided. Similarly, two sets of pins arranged in a comb shape are also provided on the shaft portion between the product outlet 22 and the heat exchange region 24 (the right end side of the shaft main body 61 in FIG. 1). The comb-like pins 71 provided at both ends of the shaft main body 61 are erected at positions shifted so as not to overlap the rotation locus with respect to the comb-like pins 71 on the opposite side in the circumferential direction. (See FIG. 3).

In FIG. 1, pins 71, 71... Erected on the right end side of the shaft main body 61 play a role of preventing the product outlet 22 from being blocked by scraped crystals in the manufacture of a crystal product to be described later. .
On the other hand, the pins 71, 71... Erected on the left end side of the shaft main body 61 in FIG. , The raw material inlet 21 is prevented from being blocked by the scraped crystals.

  The number, mounting position, dimensions, and shape of the blade 65 and the pin 71 are not limited to those shown in the drawings, and can be appropriately changed according to the application, the size of the cylinder, and the like.

  Hereinafter, the specific operation of the heat exchange device of the present invention will be described.

(Operation when manufacturing crystalline products)
When manufacturing a crystal product such as a medicine, the cylinder 2 is sufficiently cooled by supplying a coolant as a heat exchange fluid into the jacket 4 and circulating it along the outer wall of the cylinder. Subsequently, the motor 8 is driven to rotate the shaft 6, and a flowable material (processing object) containing a crystal component is continuously fed into the raw material inlet 21 by a pressure feed pump. The material flowing into the cylinder 2 from the raw material inlet 21 is pushed away in the direction in which the blade 65 is disposed by the subsequent material to be pumped.

  Subsequently, when the heat exchange area 24 in the cylinder (area in the cylinder 2 in the range where the jacket 4 is covered) is reached, the crystal component in the material undergoes heat exchange (rapid cooling) at the portion in contact with the inner wall surface of the cylinder. In addition to crystallization, the precipitated crystals are quickly scraped (scraped) by the tip portions of the rotating blades 65, 65,. Therefore, in the process in which the material flows through the heat exchange region 24, the crystallization by heat exchange and the scraping of the crystals by the blades 65, 65... Are repeated, and the amount of crystals in the material gradually increases. The material is a low-fluidity slurry-like material (rough shape) contained in the heat exchange region 24 and is washed away.

  As shown in FIGS. 1 and 3, since the blade 65 is not provided outside the heat exchange region 24, the supercooled low-fluidity material stagnates on the inner wall of the cylinder 2 or the inner wall of the product outlet 22. In addition, the crystals are easy to bond to each other, and there is a possibility that the product outlet 22 may be blocked by a conventional apparatus.

  However, in the present invention, pins 71, 71... That rotate as disturbance members that disturb the material are erected on the product outlet 22 side in the cylinder, so that the material that has come out of the heat exchange region is disturbed. . Thereby, the accumulation of the material on the inner wall of the cylinder and the inner wall of the product outlet is prevented, and when the crystals are combined to form a lump, the material is crushed to ensure fluidity. As a result, the slurry-like material containing a large amount of crystals is swept away and smoothly discharged from the product outlet 22 without closing the product outlet 22.

The discharged slurry material may be used for the next step for separating the crystals, or may be sent again to the heat exchange device to increase the amount of crystals. In the latter case (when increasing the amount of crystals), the material may be circulated through the cylinder. The circulation here means that the material discharged from the product outlet 22 through the heat exchange region 24 in the cylinder is re-entered into the cylinder again through the raw material inlet 21 and is circulated through the heat exchange region 24. The following steps 1) to 4) are repeated for a necessary cycle.
1) The material stored in the raw material tank is pumped from the raw material inlet 21 into the cylinder.
2) Heat exchange (crystallization) is performed in the process of flowing through the heat exchange region 24 and the crystals are scraped off.
3) The material mixed with crystals is discharged from the product outlet 22.
4) Receive the discharged crystal mixed material in the original raw material tank.

(Modification)
The above-described embodiment is an example of the present invention, and various modifications can be employed within the scope of the claims.

  For example, the arrangement of the pins constituting the disturbance member is not limited to that shown in FIGS. 1 to 3, and may be arranged as shown in FIGS. 4 and 5. In the heat exchange device shown in FIGS. 4 and 5, a plurality of pins 72 (rotating pins) are erected in a comb-tooth shape with respect to the shaft body 61, and pins 73 (non-rotating fixed pins) are also provided on the inner wall side of the cylinder. A plurality of are arranged. The fixed pin 73 on the cylinder side is provided at a position shifted from the standing position of the rotation pin so as not to obstruct the operation of the rotation pin 72. When the rotation pin 72 rotates together with the shaft 6, the rotation pin rubs through the gap between the cylinder-side fixed pins 73 and 73 (or the side of the fixed pin 73 at the end). It has become.

  Although FIG. 4 shows a modification of the pin arrangement on the product outlet 22 side, a similar pin arrangement can also be adopted on the raw material inlet 21 side shown in FIG. This not only prevents the product outlet 22 from being blocked, but also prevents the raw material inlet 21 from being blocked. Therefore, even when heat exchange is performed in the above-described circulation manner, it is possible to reliably prevent the accumulation of crystals and the clogging of the entrances 21 and 22 and efficiently generate crystals and discharge materials. .

  1 shows a configuration in which pins 71, 71... Are arranged at both ends (the raw material inlet 21 side and the product outlet 22 side) of the shaft body 61. The mounting positions of these pins are shown in the figure. It is not limited. In the present invention, the pins constituting the disturbance member are not limited to both ends of the shaft main body 61, and can be attached at arbitrary positions as required.

  For example, it is possible to provide a product provided with a pin only on the raw material inlet 21 side or a product provided with a pin only on the product outlet 22 side depending on the application.

  For example, as shown in FIG. 6, in addition to the raw material inlet 21 side and the product outlet 22 side in the cylinder 2, it is also possible to provide pins 72 and 73 in the intermediate region (range of the heat exchange region 24). .

  In addition, in the embodiment described above, a pin having a circular cross section is used, but the shape of the pin is not limited to this, and a cross sectional ellipse, a semicircular cross section, a polygonal cross section (rectangle, triangle, square, trapezoid) Various shapes can be employed as required.

2 Cylinder 4 Jacket 6 Shaft 8 Motor 21 Raw material inlet 22 Product outlet 24 Heat exchange area 41 Supply port 42 Discharge port 45 Cylindrical space 61 Shaft body 62 Rotating shaft 63 Rotating shaft 64 Blade 65 Blade (scraping member)
67 Base 71 pin (disturbing member)
72 Rotating pin (disturbing member)
73 Fixing pin (disturbing member)

Claims (3)

A heat exchange device that exchanges heat between the fluid for heat exchange flowing along the outer peripheral surface of the cylinder and the object to be processed fed into the cylinder through the cylinder,
A cylinder that functions as a heat transfer body;
A rotatable shaft provided in the cylinder;
A scraping member provided on the shaft for scraping off the workpiece to be heat-exchanged on the inner wall of the cylinder;
A disturbance member provided in the cylinder for disturbing the object to be processed in the cylinder;
A heat exchange device characterized by comprising:   The heat exchanging apparatus according to claim 1, wherein the disturbance member includes a pin, and at least one of the disturbance member is provided upright on the shaft and / or the inner wall of the cylinder.   The heat exchanging apparatus according to claim 1, wherein the disturbing member includes a pin, and a plurality of the disturbing members are provided in a comb shape on the shaft and the inner wall of the cylinder.

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