JP3880461B2 - Multi-tube heat transfer stirrer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a multi-tube heat transfer stirrer that heats or cools a fluid while stirring.
[0002]
[Prior art and its problems]
Conventionally, as a heat transfer stirrer for a fluid, for example, a heat medium fluid circulation jacket provided on the outer periphery of the agitation tank, a heat medium fluid circulation coil installed in the agitation tank, a process fluid to be agitated externally There are things that circulate and exchange heat. And as the stirring means in these heat transfer stirrers, a propeller type stirring blade having a plurality of blades is frequently used.
[0003]
However, in the case where the circulation jacket is provided on the outer periphery of the stirring tank, heat exchange is performed via the peripheral wall of the stirring tank, so that heat transfer efficiency is inferior and heat transfer to the process fluid in the stirring tank is difficult. It was. In addition, in the case where the circulation coil is loaded in the stirring tank, there is a problem that the stirring efficiency is lowered by the coil and that internal cleaning after operation is difficult. Furthermore, the above-mentioned heat exchange by external circulation has a drawback that a large piping space is required for the external circulation, and it is difficult to make the apparatus compact and energy loss increases. On the other hand, the propeller-type stirring blades frequently used in these heat transfer stirrers have a blade at the end of the rotating shaft that extends long in the tank, so that the load associated with stirring is large, resulting in failure or damage. There was also a problem that it was easy to produce.
[0004]
In view of the above situation, the present invention is excellent in heat transfer efficiency between a process fluid and a heat transfer fluid as a heat transfer stirring device stirring device that heats or cools a process fluid while stirring, and the entire process fluid in the stirring tank It is intended to provide a material that can transfer heat evenly, has little energy loss, and is less likely to cause failure or damage to the stirring blade and has excellent durability.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, a multi-tube heat transfer stirrer according to claim 1 of the present invention is shown with reference numerals in the drawings, and the heat transfer agitation tank 1 has flow chambers 11 and 12 on both sides. And an intermediate heat exchange chamber 10, one of the flow path chambers 11, 12 is provided with an inlet 2 a for the process fluid PL, and the other is provided with an outlet 2 b for the process fluid PL. Are connected in parallel to the flow chambers 11, 12 on both sides, and a plurality of heat exchange pipes 3... Are arranged in parallel, and heat is supplied to the heat medium flow path 10 a configured between the heat exchange pipes 3 in the heat exchange chamber 10. The heat medium flow ports 4a and 4b through which the medium fluid HL flows are provided, the flow chamber 11 on the process fluid inflow side has a stirring blade 5, and the process supplied to the heat transfer stirring tank 1 from the flow inlet 2a The fluid PL is caused by the rotational thrust of the stirring blade 5 and the heat exchange pipes 3... The heat medium fluid HL flowing through the heat medium flow path 10a in the heat exchange chamber 10 in the process of circulating between the flow chambers 11 and 12 on both sides using the heat exchange pipe group 3 on the peripheral side as opposite flow paths. The process fluid outflow side circulation chamber is provided with baffles in a multi-stage shape, and the process fluid flowing from the heat exchange chamber to the process fluid outflow side circulation chamber is further stirred and mixed in the flow chamber. The configuration is adapted to be adopted .
[0006]
The invention of claim 2 is the multi-tube heat transfer stirrer according to claim 1, wherein the circulation chamber 11 having the stirring blade 5 has an annular weir wall 6 surrounding the stirring blade 5, It is assumed that the process fluid PL circulates with the heat exchange pipes 3... Located on the inner side of the dam wall 6 and the heat exchange pipes 3 located on the outer side as opposite flow paths.
[0007]
The invention of claim 3 is the multi-tube heat transfer stirrer according to claim 1 or 2, wherein the heat exchange chamber 10 has an obstruction along a plane perpendicular to the tube axis direction of the heat exchange pipes 3. Plates 7a and 7b are provided, and the heat transfer fluid HL is configured to flow in a meandering manner in the heat exchange chamber 10 through the baffle plates 7a and 7b.
[0008]
The invention of claim 4 is the multi-tube heat transfer stirrer according to any one of claims 1 to 3, wherein the flow chambers 11 and 12 are provided on both upper and lower sides in the vertical heat transfer stirrer tank 1. The stirring blade 5 is disposed in the circulation chamber 11 and the outlet 2b of the process fluid PL is provided in the lower circulation chamber 12.
[0009]
According to a fifth aspect of the present invention, in the multi-tube heat transfer agitator according to any one of the first to fourth aspects, the agitating blade 5 has a blade shape that generates a rotational thrust in the rotation axis direction and rotates reversibly. It is said.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the multi-tube heat transfer stirrer according to the present invention will be specifically described with reference to the drawings. 1 is a longitudinal sectional view of the entire multi-tube heat transfer stirrer, FIG. 2 is a sectional view taken along line AA in FIG. 1, and FIG. 3 is a sectional view taken along line BB in FIG.
[0012]
This multi-tube heat transfer type stirring device includes a stirring tank 1 having a bowl-shaped and substantially bowl-shaped outer shape, and the inside of the stirring tank 1 is subjected to intermediate heat exchange via upper and lower partition plates 8a and 8b. It is divided into a chamber 10 and distribution chambers 11 and 12 on both upper and lower sides. The heat exchange chamber 10 is provided with heat medium circulation ports 4a and 4b in the upper and lower portions, and a plurality of heat exchange pipes 3 along the vertical direction are arranged in parallel, and both end portions of the heat exchange pipes 3 are arranged. Passes through the partition plates 8a and 8b and opens to the flow chambers 11 and 12 on both upper and lower sides. The upper flow chamber 11 is set wider than the lower flow chamber 12 in the vertical direction, and the stirring blade 5 is disposed in the vicinity of the upper partition plate 8a and the annular weir surrounding the stirring blade 5 The wall 6 is provided with the lower end fixed to the upper partition plate 8a, and the pipe body 20 forming the inlet 2a of the process fluid PL provided at the upper eccentric position enters obliquely, and the inner end 20a of the opening is an annular weir wall It faces the inside of 6. The lower flow chamber 12 is provided with an outlet 2b for the process fluid PL at the center of the bottom thereof.
[0013]
A space between the heat exchange pipes 3 in the heat exchange chamber 10 constitutes a heat medium flow path 10a communicating with the heat medium flow ports 4a and 4b, and the heat medium flow path 10a has upper and lower sides along a horizontal plane. The baffle plates 7a and 7b are provided so as to extend in the opposite directions from one side of the inner periphery of the stirring tank 1 to the middle of the opposite side. As a result, the heat medium fluid HL flowing from one of the heat medium flow ports 4a and 4b changes direction twice in a meandering manner in the heat exchange chamber 10 and reaches the other of the heat medium flow ports 4a and 4b. . Note that both end portions of the heat exchange pipes 3 are fixed to the upper and lower partition plates 8a and 8b in a liquid-tight manner by welding or the like at the penetrating portions, so that the heat medium flow path 10a has the upper and lower flow chambers 11 and 12 completely isolated.
[0014]
The agitation tank 1 includes a cylindrical body portion 13 and a bowl-shaped upper lid 14 and a bottom lid 15, and flange portions 13 a and 13 b provided at the opening peripheral edges of both ends of the body portion 13, and the upper lid 14 and the bottom lid 15. The flange portions 14a and 15a at the peripheral edge of the opening are joined with each other via a gasket 16 and tightened with bolts to constitute an integral hermetic container and are fixed in a bowl shape by a support frame 17. In addition, a reversible motor 19 with a speed reducer is installed on the upper lid 14 via a gantry 18, and a rotary shaft 30 that is rotationally driven by the motor 19 extends along the vertical center line of the agitation tank 1. 11, and the stirring blade 5 is attached to the lower end of the rotating shaft 30. The agitating blade 5 is provided with four blades 5a, which are substantially fan-shaped in plan view and inclined with respect to the rotation axis direction, and generate a thrust in the rotation axis direction by the rotation.
[0015]
Reference numeral 21 denotes a bush interposed in the upper cover 14 penetrating portion of the rotary shaft 30, and 22 denotes a viewing window provided on the upper cover 14. Further, the body portion 13 is provided with an annular bulging portion 13c at a lower intermediate position in order to absorb the expansion and contraction accompanying the temperature change. The outlet 2b at the bottom of the lower flow chamber 12 is opened and closed by an open / close valve (not shown).
[0016]
In order to perform the heat transfer stirring process by the multi-tube heat transfer stirrer having the above-described configuration, the process fluid PL to be subjected to heat transfer stirring such as chemicals is transferred from the inlet 2a to the stirring tank 1 with the outlet 2b closed. If the heat medium fluid HL is circulated at a constant flow rate from one of the heat medium flow ports 4a and 4b to the other while the stirrer blade 5 is rotated at a required rotational speed. Good. Accordingly, for example, when the stirring blade 5 is rotating forward (rotating rightward in plan view), the process fluid PL in the upper flow chamber 11 is located inside the annular weir wall 6 due to the rotational thrust thereof. The process fluid PL in the lower flow chamber 12 is sent to the upper flow chamber 11 through the heat exchange pipes 3... Outside the annular weir wall 6. The entire process fluid PL in the agitation tank 1 circulates in a form that descends the central side of the heat exchange chamber 10 and rises on the peripheral side, and in this process, the heat medium flow path 10a in the heat exchange chamber 10 is meandered. Heat exchange is performed with the flowing heat medium fluid HL. Thus, when the predetermined time elapses and the entire process fluid PL reaches the required temperature, the stirring blade 5 is stopped, the outlet 2b is opened, and the process fluid PL is led out to the outside.
[0017]
According to such heat transfer stirring, the process fluid PL in the stirring tank 1 is forced to continuously circulate in the vertical direction in the stirring tank 1 while receiving the stirring and mixing action by the stirring blade 5. Since the entire temperature is always equalized, heat exchange is performed with a very large heat transfer area through a large number of heat exchange pipes arranged in the heat exchange chamber 10, so that the heat exchange efficiency becomes extremely high and short. It can be heated or cooled to the required temperature over time, and high processing efficiency is obtained.
[0018]
Thus, in this multi-tube heat transfer stirrer, due to the presence of the annular weir wall 6 surrounding the stirring blade 5 , the upward flow and the downward flow of the process fluid PL in the upper flow chamber 11 do not interfere with each other and circulate. As the flow becomes stable, the heat medium fluid HL flows in a meandering manner through the heat medium flow path 10a in the heat exchange chamber 10, so that higher heat exchange efficiency can be obtained. In addition, the stirring device has no moving parts other than the stirring blade 5, and the stirring blade 5 is arranged on the upper portion of the stirring tank 1 so that the rotating shaft 30 is short, and the load associated with stirring is reduced accordingly, resulting in failure or damage. Since it is hard to produce, it shows excellent durability.
[0019]
4 and 5, shows a implementation form of the present invention, the mounting plate 43 to the multi-stage vertically concentrically inside the lower distribution chamber 12 of the bottom cover 15, downstream toward the peripheral portion from the central portion Baffles 40 to 42 made of an annular annular disk are provided, and flow holes 41a and 42a in which the flow holes 40a of the lowermost baffle 40 have the smallest diameter and the larger the upper diameter are provided at the center.
[0020]
As described above, by providing the baffles 40 to 42 in the lower flow chamber 12 below the heat exchange chamber 10, the process fluid PL flowing from the heat exchange chamber 10 to the lower flow chamber 12 as shown by the arrow is baffled. 40 to 42 is further mixed and stirred, and then sent upward as indicated by an arrow. Further, by repeating the circulation from the upper flow chamber 12 to the heat exchange chamber 10, the heat transfer and stirring is even better and more uniform. A high-quality heat-exchanged wrestling fluid PL can be taken out.
[0021]
In addition, the stirring blade 5 is a reversible rotation type, and if it is reversely rotated (left-turned in a plan view), the circulating flow of the process fluid PL rises on the center side of the heat exchange chamber 10 and falls on the peripheral side. . Therefore, the heat transfer stirring efficiency can be further increased by switching between normal rotation and reverse rotation at intervals of several minutes to several hours as necessary. The heat transfer agitation described above is a badge system, but depending on the type of the process fluid PL and the purpose of processing, the amount of injection of the process fluid PL from the inlet 2a and the amount of inflow from the outlet 2b via a throttle valve or the like. Can be controlled to be equal to each other, and heat transfer stirring can be performed in a continuous manner. In the case of this continuous system, the inner end 20a of the pipe body 20 of the inlet 2a faces the inner side of the annular weir wall 6, so that the process fluid PL is agitated immediately after injection and mixed with the liquid in the tank. This is advantageous in terms of equalization of heat transfer stirring.
[0022]
The kind of the heat transfer fluid is not particularly limited, but steam, high temperature air, hot water, high temperature oil, etc. are used for heating, and cold water, low temperature gas, etc. are used for cooling. Thus, when a gas is used as the heat transfer fluid, the upper heat transfer port 4a is used as the inlet as shown by the arrow in FIG. 1, and when the liquid is used, the lower heat transfer port 4b is used as the inlet. It is common.
[0023]
In the multitubular heat transfer agitation apparatus of the present invention, for example, a plurality of inlets 2a can be used, and different liquids can be injected from these to react in the agitation tank 1, or a mixture can be prepared. It is. Further, the stirring blade 5 may be disposed in the lower flow chamber 12, but the arrangement in the upper flow chamber 11 is simple and functional in terms of the device configuration including the drive motor, and the assembly of the device. Production is also easier. The agitation tank 1 may be a horizontal type, but a vertical type is recommended because the horizontal type tends to cause a bias in the circulation flow due to gravity. In addition, in the present invention, the detailed configuration such as the number, diameter, and arrangement interval of the heat exchange pipe 3, the blade shape of the stirring blade 5, and the number of blades can be variously modified in addition to the embodiment.
[0024]
【The invention's effect】
According to invention of Claim 1, it is a multi-tube type as a heat-transfer stirrer which heats or cools a process fluid while stirring, The heat exchange chamber in a heat-transfer stirrer tank, stirring a process fluid with a stirring blade Because it is forced to circulate through a large number of heat exchange pipes arranged side by side, heat transfer efficiency between the process fluid and the heat transfer fluid is excellent, and heat can be evenly transferred to the entire process fluid in the agitation tank, and energy In addition to a small loss, it is possible to provide an excellent durability that is unlikely to cause failure or damage to the stirring blade.
According to the present invention, the process fluid outflow side circulation chamber is provided with baffles in a multi-stage shape, and the process fluid flowing from the heat exchange chamber to the process fluid outflow side circulation chamber is further stirred and mixed in the circulation chamber. Therefore, it is possible to more uniformly heat transfer and agitate the process fluid, and to take out a very good heat exchanged process fluid.
[0025]
According to the invention of claim 2, in the above-described multi-tube heat transfer stirrer, since the annular weir wall surrounding the stirring blade is provided in the circulation chamber having the stirring blade, the circulation flow of the process fluid is stabilized, More efficient heat transfer stirring can be performed.
[0026]
According to the third aspect of the present invention, in the above-described multi-tube heat transfer stirrer, since the heat medium fluid flows in a meandering manner through the heat medium flow path in the heat exchange chamber by the baffle plate, higher heat exchange efficiency can be obtained. .
[0027]
According to the invention of claim 4 , in the above-mentioned multi-tube heat transfer agitation apparatus, the vertical heat transfer agitation tank has flow chambers on both upper and lower sides, the stirring blades are disposed in the upper flow chamber, Since the outlet of the process fluid is provided in the flow chamber, the circulation flow of the process fluid is not biased, the heat transfer stirring efficiency is improved, and the processed process fluid can be naturally derived from the outlet. The device configuration is also simple and functional.
[0028]
According to the invention of claim 5, in the above-mentioned multi-tube heat transfer agitator, the agitating blade has a blade shape that generates a rotational thrust in the rotation axis direction and rotates reversibly. By switching between forward rotation and reverse rotation at, the circulating flow of the process fluid can be reversed to further increase the heat transfer stirring efficiency.
[Brief description of the drawings]
FIG. 1 is an overall longitudinal sectional view of a multi-tube heat transfer stirrer showing a main part of an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along line AA in FIG.
FIG. 3 is a cross-sectional view taken along line BB in FIG. 1;
4 is a main part longitudinal sectional view showing an implementation form of the present invention.
5 is a cross-sectional view taken along line CC of FIG.

Claims (5)

The heat transfer stirred tank is divided into both sides of the distribution chamber and the intermediate heat exchange chamber, while the inlet of the process fluid to both flow through chamber, the outlet is provided on the other, each of the heat exchange chamber A plurality of heat exchange pipes having both ends communicated with the flow chambers on both sides, and a heat medium flow port through which the heat medium fluid flows in the heat medium flow path formed between the heat exchange pipes in the heat exchange chamber With a stirring blade in the flow chamber on the process fluid inflow side,
The process fluid supplied into the heat transfer agitation tank from the inflow port causes the heat exchange pipe group on the central side and the heat exchange pipe group on the peripheral side to mutually pass through the rotational thrust of the agitation blade. in the process of circulating between both sides of the flow chamber as a reaction direction channel in the multi-tubular heat transfer stirrer consisting configured to heat exchange with the heating fluid medium flowing through the heat medium flow path of the heat exchange chamber ,
A multi-tube heat transfer system in which baffles are provided in a multistage shape in the process fluid outflow side flow chamber, and the process fluid flowing from the heat exchanger to the process fluid outflow side flow chamber is further stirred and mixed in the flow chamber. Stirring device.   The circulation chamber having the agitating blade has an annular weir wall surrounding the agitating blade, and the heat exchange pipe group located inside the annular weir wall and the heat exchange pipe group located outside are flown in opposite directions. The multi-tube heat transfer stirrer according to claim 1, wherein the process fluid circulates as a path.   A baffle plate is provided in the heat exchange chamber along a plane perpendicular to the tube axis direction of the heat exchange pipe group, and the heat transfer fluid is configured to meander through the heat exchange chamber through the baffle plate. The multi-tube heat transfer stirrer according to claim 1 or 2.   2. A vertical heat transfer stirring tank having the flow chambers on both upper and lower sides, the stirring blades disposed in an upper flow chamber, and an outlet for the process fluid provided in a lower flow chamber. In the multi-tube heat transfer stirring device according to any one of to   The multi-tube heat transfer stirrer according to any one of claims 1 to 4, wherein the stirring blade has a blade shape that generates rotational thrust in a rotation axis direction and rotates reversibly.

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