JP2691748B2 - Heat exchange equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a heat exchange device, and more particularly to a heat exchange device capable of uniformly heating or cooling a highly viscous fluid and having an excellent piston flow property. It is about.

[Conventional technology]

Various types of conventional heat exchangers are known, such as a shell-and-tube type in which a group of thin tubes is contained in a drum, or a plate type with fins. However, such heat exchangers
When it is necessary to uniformly heat or cool a high-viscosity fluid, the heat transfer area per unit volume cannot be so large and the device becomes large, or a locally stagnant portion occurs. It becomes easy, and heating or cooling of the highly viscous fluid becomes non-uniform, resulting in partial differences in thermal history, and it is difficult to obtain stable quality. Therefore, particularly in a system handling a highly viscous fluid, a heat exchange device capable of uniformly heating or cooling in a system close to a piston flow in which no stagnant portion is generated and which can be uniformly heated or cooled has been desired and various proposals have been made.

For example, in U.S. Pat. No. 2,727,884, a plurality of heat exchange pipes are arranged in parallel between a plurality of stages of stirring blades provided on a rotating shaft in a container having a rectangular cross section, and a jacket on the outer periphery is arranged. By passing the refrigerant through the pipe from
A method for removing the heat of a fluid that is stirred and flowing down is described. Further, in JP-A-57-125202, a plurality of double spiral band type stirring blades are attached to a rotary shaft attached inside a cylindrical container, and a partition effect is provided between the stirring blades. There is described a polymerization apparatus provided with a baffle or a shell-and-tube heat exchanger having

[Problems to be solved by the invention]

However, in the former method, since a plurality of pipes arranged in parallel are used as the heat exchange means, the heat transfer area per unit volume cannot be made large, and when the stirring is insufficient, the high viscous fluid There is still a problem in terms of achieving desirable piston flow characteristics and uniform cooling because grid-shaped uneven flow (channeling) in the flow direction and stagnant portions are likely to occur. In the latter case, the piston flow is improved to some extent by using a baffle plate and a vertical multi-tube heat exchanger, but the vertical multi-tube heat exchanger has a heat transfer area per unit volume that much. There are drawbacks that cannot be taken big.

An object of the present invention is to solve the above-mentioned drawbacks in the known art, and in particular, it has an excellent piston flow property desired for a highly viscous fluid, has a large heat transfer area per unit volume, and is capable of uniform cooling or It is to provide a heat exchange device having a large heating effect.

[Means for solving the problem]

The present invention comprises a cylindrical container having fluid inlets and outlets at both ends, and a rotating shaft attached to the inside of the container. The rotating shaft has stirring blades extending in a substantially right-angle direction at predetermined intervals. A large number of plate-shaped heat exchangers equipped with passages for other fluids that flow in and out from the annular passage provided in the outer wall are installed in the container space between each stage stirring blade A heat exchange device characterized in that the heat exchange device is arranged so as to project radially from the inner wall of the container so as to form a fluid passage parallel to the axis of rotation between the adjacent plate-shaped heat exchange elements radially around the axis. is there.

 The heat exchange device of the present invention will be described in detail below.

The term "cylindrical container" as used in the present invention means that both ends are closed by flanged lids, and a fluid to be heated or cooled, for example, a highly viscous fluid inlet, is provided at one end of the lid and the other end is provided with a lid. A fluid outlet is provided, which may be vertical or horizontal. Examples of the highly viscous fluid include polymer solutions and slurries, and foods such as chocolate and mayonnaise. Further, it may be a reaction liquid that causes an exothermic or endothermic reaction. On the outer circumference of the cylindrical container, at one end, for example, steam or other gas or liquid organic compound,
An annular passage such as a jacket having an inlet for a heat medium such as water or hot water and an outlet for the heat medium at the other end is provided. In addition, light oil, heavy oil, etc. to be heat-exchanged can also be used.

Further, a rotating shaft is provided inside the cylindrical container so as to pass through the lids at both ends and supported by bearings, and is appropriately engaged with an electric motor to be rotatable. A plurality of stages of one or a plurality of stirring blades extending in a substantially perpendicular direction at predetermined intervals are installed on the rotary shaft. The stirring blades referred to herein are preferably rods, inclined plates, blades, angles, spiral blades, etc. that can stir fluids in the same horizontal plane without causing backmixing. When the cylindrical container is of the vertical type, the arrangement of the stirring blades may be one or more for each stage, but may be installed in the same direction. By changing the projecting direction by 90 ° and installing them differently, pulse vibration in the vertical direction is generated in the high-viscosity fluid stirred by each stirring blade, and the heat transfer in the upper and lower heat transfer parts close to the stirring blade is generated. It is more preferable because it has the effect of improving the thermal efficiency.

In the container space between these stage stirring blades, a large number of plate-shaped heat exchangers each having a passage for a heat medium flowing in from one chamber of the outer peripheral passage and flowing out to another chamber of the outer passage are rotated. So as to form a fluid passage radially around the shaft and between each adjacent plate-shaped heat exchange element, parallel to the rotation axis,
Arrange by projecting from the inner wall of the container. The outer peripheral annular passage means that the entire outer periphery of the cylindrical container is surrounded by a jacket method so that the annular passage of the jacket is divided by a partition plate for each plate-shaped heat exchanger group of each stage, or a plate-shaped heat exchanger for each stage is formed. A jacket, a pipe, and other passages for passing the belt-shaped heat medium may be provided on the outer periphery of the tubular container for each exchange group.

The plate-shaped heat exchanger has its root fixed by conduits forming the inlet and outlet of the heat medium from the inner wall of the cylindrical container, and is projected until it comes close to the rotating shaft. Adjacent intervals are preferably substantially constant so that the passage speed of the fluid flowing parallel to the rotation axis is constant, and for this purpose, it is preferable that each plate-shaped heat exchange element has a tapered cross-sectional shape. In addition, it is preferable that a partition plate is appropriately provided inside the plate heat exchanger to form a passage for the heat medium.

In the heat exchange device of the present invention, the highly viscous treatment liquid is usually passed through the cylindrical container, and the heat medium is passed from the outer jacket to the plate-shaped heat exchange element. May be.

〔Example〕

Hereinafter, embodiments of the present invention shown in the accompanying drawings will be described in detail.

FIG. 1 is a longitudinal sectional view of a heat exchange device showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and FIG. 3 is shown in FIGS. It is a partial cross-sectional perspective view which shows the plate-shaped heat exchange body. In the figure, 1 is a vertical cylindrical container, in which the inlet 2 of a highly viscous fluid to be heated or cooled is provided on the side wall of a nozzle provided in the lids at both ends, for example, in the upper center, and in the lower center. The nozzle is provided with an outlet 3 for the fluid, and the outer wall portion is provided with a jacket 6 having an inlet 4 and an outlet 5 for the heat medium. In addition, fluid inlet 2 and outlet 3
Alternatively, the inlet may be provided at the lower portion and the outlet may be provided at the upper portion, or the inlet and the outlet may be provided at the lid portion other than the central nozzle portion.

The cylindrical container 1 can be formed to have an arbitrary length by connecting it in the middle with a flange or the like, and the cross section is most preferably circular, but may be rectangular.

Reference numeral 7 denotes a rotating shaft vertically provided inside the container 1, preferably at the center thereof, and bearings provided with small diameter shafts 8 and 9 projecting from both ends thereof at a central nozzle of both end lids of the container. 10 and 11 are held, and one of them is connected to an electric motor through a speed reducer (not shown) to be rotated.

The outer diameter d of the rotating shaft 7 is not particularly limited, but in order not to make a difference in the stirring effect on the fluid in the radial direction, if the inner diameter of the container 1 is D, d / D = 0.3.
Within the range of to 0.6, more preferably around 0.5. When d is less than 0.3, a fluid retention area is likely to occur around the rotating shaft, and the difference in shear force due to the stirring blades inside and outside the vessel cross section in the radial direction becomes large, resulting in uniform piston flow characteristics of highly viscous fluid. become weak. On the other hand, when d / D is larger than 0.6, the piston flow is good, but the equipment becomes large, which is not desirable. Numeral 12 is an inclined plate-shaped stirring blade extending from the rotating shaft 7 to the vicinity of the inner wall of the container 1 at a right angle, and two blades are arranged at predetermined intervals, and the protruding direction is changed by 90 ° for each step. It is installed over 5 steps in the drawing.
When the rotating shaft 7 is formed of a hollow body, the stirring blade 12 has the rotating shaft 7
If the plate-shaped heat exchange element group described later is present, it can be easily installed by horizontally projecting and fixing the same. The stirring blades 12 are preferably rod-shaped, plate-shaped, angle-shaped, spiral blade-shaped, or the like that can stir the fluid in the same horizontal plane without causing backmixing.

It should be noted that the stirring is an essential requirement for the heat exchange device not only to prevent uneven flow and retention due to uneven flow in the vessel cross section but also to improve heat transfer efficiency.

Reference numeral 13 denotes a dispersion stirring plate provided on the small-diameter shafts 8 and 9 protruding from the upper end or the lower end of the rotary shaft 7 for the purpose of allowing the fluid to uniformly flow into or out of the container.
It has been installed.

Reference numeral 14 denotes a plate-shaped heat exchange element provided in the container space between the stirring blades 12 of each stage. As is clear from the drawing, these are heat medium passages from the jacket portion of the outer wall.
15 are arranged radially around the rotary shaft 7 at a predetermined interval so as to form a fluid passage parallel to the rotary shaft 7 between the adjacent plate-shaped heat exchangers.
These plate-shaped heat exchangers 14 are heat medium inlet nozzles 17 that flow from one chamber of an annular partition wall 16 provided in the outer jacket portion 6 on the inner wall surface of the container 1, and an outlet to the other chamber of the partition wall 16. It is projected through the nozzle 18. The heat medium flowing through the heat medium passage 15 in the plate-shaped heat exchange body 14 is a heat medium for heating or cooling the fluid flowing outside the plate-shaped heat exchange body 14. The heat medium may be introduced separately from a pipe.

The tip of the protruding portion of the plate-shaped heat exchange element 14 is brought close to the rotary shaft 7. Plate-shaped heat exchange elements in which the fluid is arranged between the plate-shaped heat exchange element 14 and the rotating shaft 7 and radially.
In order to smoothly pass the space between 14 parallel to the rotating shaft 7 while maintaining the piston flowability, the plate-shaped heat exchange element 14
It is desirable that the distance between the rotary shaft 7 and the rotary shaft 7 and the distance between the plate-shaped heat exchange elements 14 are not so different in the radial direction.
From this point of view, the horizontal cross section of the plate-shaped heat exchange element 14 is
As is clear from FIG. 2, the inner wall of the container 1 to the rotating shaft 7
It is desirable to form a taper toward the center of the container up to the position close to.

[Action]

As described above in detail, in the heat exchange device of the present invention, the plate-shaped heat exchange elements are arranged radially around the rotary shaft in each stage space of the horizontally extending stirring blades provided on the rotary shaft. Has the greatest features. As a result, the heat transfer area per unit volume is dramatically increased by increasing the number of plate-shaped heat exchangers and the length in the longitudinal direction. As a result of making the space of each stage stirring blade narrower, the required power for stirring does not increase so much, and it becomes easy to directly apply the stirring effect to the plate-shaped heat exchangers arranged in a radial pattern.
The uniform heating or cooling effect can be enhanced. In addition, each section of the container is uniformly partitioned by the radially arranged plate-shaped heat exchange elements, and as a result, there is no retention due to dead space and the fluid in the vertical system has a significantly improved piston flow property. .

〔The invention's effect〕

INDUSTRIAL APPLICABILITY According to the present invention, since it is possible to uniformly heat or evenly cool a high-viscosity fluid and improve the piston flowability, the versatility is wide and it is particularly suitable as an industrial-scale heat exchange device.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a heat exchange device showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and FIG.
It is a partial cross-sectional perspective view which shows the plate-shaped heat exchange body shown by FIG. And FIG. In the figure, 1 ... cylindrical container, 2 ... fluid inlet, 3 ... fluid outlet, 6 ... jacket, 7 ... rotating shaft, 12 ... stirring blade, 13 ... dispersion stirring plate, 14 ...... Plate heat exchanger, 15 …… Heat medium passage, 16 …… Partition wall.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Koji Hirashima, 4-10-3 Nakai, Kokurakita-ku, Kitakyushu, Fukuoka Prefecture JP, B1) Patent 136501 (JP, C2)

Claims (2)

(57) [Claims] 1. A stirrer comprising a cylindrical container having fluid inlets and outlets at both ends and a rotary shaft attached to the inside of the container, the rotary shaft extending in a direction substantially perpendicular to the rotary shaft at predetermined intervals. The blades are installed in multiple stages, and a large number of plate-shaped heat exchange elements with passages for other fluids that flow in and out from the annular passage provided in the outer wall are provided in the container space between the stirring blades at each stage. A heat exchange device, which is arranged so as to project radially from the inner wall of the container so as to form a fluid passage parallel to the rotation axis between the adjacent plate-shaped heat exchange elements radially around the rotation axis. . 2. The heat exchange device according to claim 1,
A heat exchange device, wherein the stirrer blades are arranged differently in odd and even stages.