JP2012172896A - Antifreezing device for tank storage liquid and liquid storage tank with heat insulating function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antifreezing device for a tank storage liquid, along with a liquid storage tank with an antifreezing function, capable of performing the heat insulation of the inside of a tank so that storage liquid can be prevented from being freezed in a cold district in winter, of achieving the largely scaled saving of electricity charges with satisfactory availability, and of easily performing the repair or exchange of a heat pipe.SOLUTION: An antifreezing device for storage liquid L is configured of a closed-end heat receiving cylinder 3 buried in the ground with heat transfer property; antifreezing solution 4 stored in the heat transfer cylinder 3; and an annular heat pipe 2 in which an almost U-shaped heat receiving section 22 is arranged so as to be immersed in the antifreezing solution 4, and a heat radiating section 21 is arranged in the liquid storage tank. Furthermore, the annular heat pipe 2 is configured by storing a heat medium liquid 23 in the heat receiving section 22, and by installing an air bubble generation chamber 22a bulging upward below a liquid level S of the heat medium liquid 23 in one vertical pipe of the U-shaped heat receiving section 22.

Description

  The present invention is an improvement of an anti-freezing device for a tank storage liquid, and more specifically, it can keep the inside of a tank warm so that the storage liquid does not freeze in winter in a cold region, and can also save electricity costs and heat pipes. The present invention relates to a tank storage liquid freezing prevention device that can be easily repaired and replaced, and a liquid storage tank having a heat retaining function.

  In recent years, many dyeing factories have performed alkali treatment of fibers before dyeing. Caustic soda solution used for this alkali treatment is temporarily stored in a large tank installed outside the factory, and the necessary amount is appropriately stored in the factory. Generally, it is used after being transported to

  However, in a dyeing factory in a cold region, it is not uncommon for the outside air temperature to be 5 ° C or lower in the winter. Cannot be performed.

  Therefore, in the past, measures have been taken to attach an electric heater to the tank so that the caustic soda solution does not freeze. It was.

  On the other hand, in the past, as a heat retaining means of the tank, a technique of burying a heat pipe and using geothermal heat is also known (for example, see Patent Documents 1 to 3), but the conventional heat pipe is in terms of performance. Since the heat transportability in the low temperature range was not sufficient, the operability was poor and the practicality was poor.

  In view of this, the present inventor has invented the use of a heat pipe (see Patent Document 2) provided with a bubble generation chamber in order to improve the performance of the heat pipe. When the pipe is designed to be long in the vertical direction, it has been found that the heat transportability is better when the heat transfer liquid is accommodated only in the heat receiving part than when the heat transfer liquid is filled in the entire annular pipe.

  In addition, it was confirmed from the results of the experiment that the performance was improved when the bubble generation chamber was provided at a position closer to the position than the position far from the liquid surface of the heat transfer fluid. If the generation chamber is provided to reduce the amount of the heat transfer fluid, when the liquid pool is generated in the heat radiating portion during operation, the amount of the heat transfer fluid in the heat receiving portion becomes very small and the evaporation efficiency is deteriorated.

  Therefore, the present inventor has adopted a structure in which a sufficient amount of heat transfer liquid is accommodated in the heat receiving part and a bubble generation chamber is provided slightly below the liquid level, but this time when the heat pipe is embedded In addition, the bubble generation chamber has come close to the ground surface where the temperature is low, and the heating temperature of the bubble generation chamber is lowered.

  In addition, when installing the above heat pipes, if the surroundings are hardened with sand or the like and buried in the ground, when the heat pipe is repaired or replaced, the heat receiving part is dug out of the ground or a new hole is formed in another place. It took a lot of labor to repair and replace.

Japanese Utility Model Publication No. 62-16166 (page 1-20, Fig. 1-2) Japanese Unexamined Patent Publication No. 2004-69197 (page 2-8, FIG. 1-8) JP 2007-24342 (page 2-19, FIG. 1-9) JP 2008-170117 A (page 2-8, Fig. 1-4)

  Therefore, the present invention has been made in view of the above problems, and the object of the present invention is to keep the inside of the tank warm so that the stored liquid does not freeze in the winter in a cold region. An object of the present invention is to provide a tank storage liquid anti-freezing device and a liquid storage tank equipped with an anti-freezing function that can realize significant savings in electricity bills with high operability and can easily repair and replace heat pipes.

  Means employed by the present inventor for solving the above-described problems will be described with reference to the accompanying drawings.

That is, the present invention has a heat receiving cylinder 3 having a heat transfer property and embedded in the ground; an antifreeze liquid 4 accommodated in the heat receiving cylinder 3; a substantially U-shaped in the antifreeze liquid 4. The heat receiving part 22 is immersed and the annular heat pipe 2 in which the heat radiating part 21 is arranged in the liquid storage tank constitutes an anti-freezing device for the stored liquid L.
Further, in the heat pipe 2, the heat transfer fluid 23 is accommodated in the heat receiving portion 22, and in one vertical tube of the U-shaped heat receiving portion 22 swells upward below the liquid surface S of the heat transfer fluid 23. By providing the bubble generation chamber 22a out,
The antifreeze liquid 4 in the heat receiving tube 3 is convected upward from below by the heat of the lowermost part of the heat receiving tube 3 heated by geothermal heat, and the bubble generating chamber 22a can be heated by the convective antifreeze 4. There are features.

  On the other hand, in the present invention, a liquid storage tank having a heat retaining function can be configured by adding a tank main body 1 capable of storing a liquid therein to the antifreezing device for the stored liquid L.

  In the present invention, the heat transportability of the heat pipe 2 can be improved by setting the outlet diameter of the bubble generation chamber 22a provided in the heat receiving portion 22 of the heat pipe 2 to 1 mm or more.

  In the heat receiving portion 22 of the heat pipe 2, the present invention provides at least one spare bubble generation chamber 22a 'below the bubble generation chamber 22a. Even when the liquid level of the liquid drops, it is possible to prevent the performance from being lowered by operating the preliminary bubble generation chamber 22 ′.

  On the other hand, in the present invention, a heat insulating cover member 31 can be attached to the top of the heat receiving tube 3 so that the antifreeze liquid 4 in the heat receiving tube 3 is not affected by the outside air temperature.

  Furthermore, the heat pipe 2 and the down pipe 25 that connect the heat receiving section 22 in the ground and the heat radiating section 21 in the tank in the heat pipe 2 are covered with a heat insulating material 26, and the heat transfer liquid 23 that passes through them and its It is also possible to prevent the steam from being affected by the outside air temperature.

  In the present invention, the heat receiving part provided with the bubble generating chamber is buried in the ground, and the heat radiating part is installed in the tank, and the heat pipe is attached to the liquid storage tank, so that the geothermal heat is transferred into the tank and the stored liquid. (Caustic soda solution, etc.) can be kept warm, so that it can be used to prevent the stored solution from freezing in cold regions where the outdoor temperature in winter is lower than the melting point of the stored solution.

  Moreover, in the present invention, the heat receiving portion of the heat pipe is installed by immersing it in the antifreeze liquid in the heat receiving tube buried in the ground, so that even if the bubble generation chamber is in a shallow position in the ground, Since the antifreeze liquid can be convected and the bubble generation chamber can be heated at a temperature higher than the surrounding geothermal heat, the operability can be improved.

  And since the utilization efficiency of geothermal heat can be improved by improving the operability of the heat pipe, not only when the apparatus according to the present invention is used alone, but also when used as an auxiliary to the electric heater, it is a winter season. In the meantime, if it is continuously used, the electricity bill can be greatly saved.

  Further, in the present invention, the heat pipe is immersed in the antifreeze liquid without being hardened with sand or the like and installed in the ground, so that the heat pipe can be easily removed simply by pulling out the heat receiving portion from the antifreeze liquid. Repair and replacement work can be saved.

  Therefore, according to the present invention, the stored liquid can be kept warm at low cost by efficiently using geothermal heat, and the tank storage liquid freezing prevention device that is convenient in terms of repair and a liquid having a heat retaining function can be used. Since a storage tank can be provided, the practical utility value of the present invention is very high.

BRIEF DESCRIPTION OF THE DRAWINGS It is a whole perspective view showing the antifreezing apparatus of the tank storage liquid in Example 1 of this invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall cross-sectional view showing a tank storage liquid freeze prevention device in Embodiment 1 of the present invention. It is a state explanatory drawing showing the operation state of the freeze prevention device in Example 1 of the present invention. It is a state explanatory drawing showing the operation state of the preliminary | backup bubble production | generation chamber in Example 1 of this invention. It is an experimental data which shows the effect of the freeze prevention apparatus in Example 1 of this invention. It is whole explanatory drawing showing the antifreezing apparatus of the tank storage liquid in Example 2 of this invention. It is a disassembled perspective view showing the form of the heat pipe in Example 2 of this invention. It is a top view showing the freezing prevention apparatus of the tank storage liquid in Example 3 of this invention.

“Example 1”
First, a first embodiment of the present invention will be described with reference to FIGS. In the figure, what is indicated by reference numeral 1 is a tank body, and what is indicated by reference numeral 2 is a heat pipe. Also, what is indicated by reference numeral 3 is a heat receiving cylinder, and what is indicated by reference numeral 4 is antifreeze.

  In the first embodiment, a tank body 1 (material: iron coated with a heat insulating material) capable of storing liquid is installed on a gantry frame F, and a heat radiating portion 21 of a heat pipe 2 is disposed inside the tank body 1. (See FIGS. 1 and 2). Further, the heat radiating portion 21 of the heat pipe 1 has a spiral shape in order to increase the contact area with the stored liquid L.

  On the other hand, the heat pipe 2 is made of an annular pipe (material: stainless steel) containing a heat transfer liquid 23 (material: water) in the heat receiving portion 22, and one vertical tube of the U-shaped heat receiving portion 22. Is provided with a bubble generating chamber 22a having an outlet dimension bulging upward by several centimeters below the liquid surface of the heat transfer liquid 23.

  Incidentally, the heat pipe 2 provided with the bubble generation chamber 22a is based on the principle of a bubble driven circulation heat pipe (commonly referred to as “BACH”), and if the outlet dimension of the bubble generation chamber 22a is 1 mm or more. Exhibits excellent heat transportability.

  In addition, regarding the arrangement of the bubble generation chamber 22a of the heat pipe 2, it is preferable that the bubble generation chamber 22a is provided as close as possible to the liquid surface of the heat transfer liquid 23 in consideration of the bubble generation conditions and the like. A bubble generation chamber 22a is provided several centimeters below the liquid level of the liquid 23.

  In addition, a heat-receiving bottomed heat receiving tube 3 (material: steel pipe) is buried in the ground around the tank body 1, and the anti-freezing liquid 4 (material: water) is filled in the heat receiving tube 3. Above, the heat receiving portion 22 of the heat pipe 2 is immersed in the antifreeze liquid 4.

  Then, by attaching the heat pipe 2 to the tank body 1 as described above, the heat medium liquid 23 vaporized in the heat receiving part 22 using geothermal heat is condensed in the heat radiating part 21 for heat exchange. Therefore, the stored liquid L can be kept warm in winter.

  Further, at the time of the above operation, the antifreeze liquid 4 in the heat receiving cylinder 3 is in a state of being convected upward from below by the lowermost geothermal heat as shown in FIG. 3, so that the bubble generation chamber 22a is higher than the surrounding underground temperature. Can be heated at temperature.

  Furthermore, in the first embodiment, the heat receiving portion 22 of the heat pipe 2 is provided with a spare bubble generating chamber 22 ′ with a space below the bubble generating chamber 22a. Even when the liquid pool occurs and the liquid level of the heat transfer liquid 23 falls, the performance can be maintained by operating the spare bubble generation chamber 22a ′.

  On the other hand, in Example 1, as a measure against the outside air temperature, the top portion of the heat receiving cylinder 3 is closed with a heat-insulating lid 31 so that the antifreeze liquid 4 is not affected by the outside air temperature. In this embodiment, a synthetic resin foam is used for the lid member 31.

  As for the heat pipe 2, the riser pipe 24 and the downfall pipe 25 that connect the underground heat receiving part 22 and the heat radiating part 21 in the tank are also covered with a heat insulating material 26, and the heat transfer liquid 23 and Steam is not affected by outside air temperature.

[Verification test of thermal insulation effect]
Next, the verification test of the heat retaining effect using the antifreezing device will be described. In this verification test, caustic soda solution with a concentration of 48% is contained in both the tank with and without antifreeze device connected, and how the temperature of these caustic soda solutions changes in winter. Examined.

  As a result, as shown in FIG. 5, the caustic soda solution on the side to which the anti-freezing device (BACH) was connected shifted at an average temperature of +1 to 2 ° C. higher than the caustic soda solution on the side not connected. It was confirmed that Thereby, the heat retention effect of the freeze prevention device was demonstrated.

  In particular, with respect to the caustic soda solution on the side where the apparatus is not connected, the transition from the supercooling state to the frozen state at the point A where the outside air temperature has decreased to near 0 ° C., and the point B after several hours is almost completely frozen. However, the caustic soda solution on the side to which the apparatus was connected was kept in a liquid state without freezing.

“Example 2”
Next, a second embodiment of the present invention will be described with reference to FIGS. In the second embodiment, the two heat pipes 2 and 2 are inserted into the heat receiving cylinder 3 so as to intersect each other (see FIG. 6). The heat dissipating parts 21 and 21 of the two heat pipes 2 and 2 are arranged vertically in the tank body 1, so that a storage tank having a height that cannot be accommodated by a single heat pipe 2 is provided. Can also be supported.

  For the two heat pipes 2 and 2, the bubble generation chambers 22a and 22a of the heat pipe 2 that is inserted later are inserted so that the bubble generation chambers 22a and 22a do not contact each other. It is provided at a position above the bubble generation chambers 22a and 22a (see FIG. 7).

“Example 3”
Next, Embodiment 3 of the present invention will be described with reference to FIG. In the third embodiment, a plurality of heat receiving cylinders 3, 3... Are installed around the tank main body 1, and the heat radiating portions 21 of the heat pipes 2 attached to these heat receiving cylinders 3 are concentrically arranged in the tank main body 1. (See FIG. 8).

  By adopting the above configuration, it is possible to cope with a storage tank having a large volume. In the third embodiment, the shape of the heat radiating portion 21 of the heat pipe 2 is a deformed shape in which the inner portions of the heat radiating portions 21, 21... Form a ring as a whole. An effect can be obtained.

  The present invention is generally configured as described above. However, the present invention is not limited to the illustrated embodiment, and various modifications can be made within the description of “Claims”. The material of the heat receiving tube 2 may be selected from other metal materials and plastic materials as long as the material has rigidity and excellent thermal conductivity. The material of the antifreeze liquid 3 also has high thermal conductivity and fluidity. As long as it has a liquid, it may be other than water.

  Also, three or more bubble generation chambers 22a provided in the heat receiving part 22 of the heat pipe 2 may be provided in the vertical direction, and the material of the heat transfer liquid 23 is appropriately selected as appropriate, such as hydrofluorocarbon or ammonia. Can be used.

  In addition, the tank body 1 can be provided with not only the heat pipe 2 but also other heat retaining means such as an electric heater. In this case, when the heat retaining effect of the heat pipe 2 is insufficient, the electric heater Can be used together to prevent the stored solution from freezing, and any of the above is within the technical scope of the present invention.

  In recent years, the use of natural energy has been promoted in the industrial world due to serious environmental problems such as global warming and oil depletion. Among them, “geothermal”, which is not easily affected by the season or weather, can be said to be a natural energy with excellent practicality that can be calculated.

  Under such circumstances, the liquid storage tank having the anti-freezing device and the heat retaining function of the tank storage liquid of the present invention can suppress the electric consumption used for the heat storage of the stored liquid by using geothermal heat. Since it is a useful technology that can be easily maintained, its industrial utility value is very high.

1 Tank body 2 Heat pipe
21 Heat sink
22 Heat receiving part
22a Gas generation chamber
23 Heat transfer fluid
24 riser
25 downcomer
26 Insulation 3 Heat-receiving tube
31 Lid 4 Antifreeze L Storage liquid F Mounting frame

Claims (6)

A storage liquid (L) freezing prevention device attached to a liquid storage tank,
A bottomed heat receiving tube (3) that has heat conductivity and is buried in the ground; an antifreeze liquid (4) accommodated in the heat receiving tube (3); and an approximately U in the antifreeze liquid (4) A letter-shaped heat receiving portion (22) is immersed, and a heat radiating portion (21) is configured to include an annular heat pipe (2) disposed in the tank,
Further, in the heat pipe (2), the heat transfer liquid (23) is accommodated in the heat receiving section (22), and in one vertical pipe of the U-shaped heat receiving section (22), the heat transfer liquid (23 The bubble generation chamber (22a) swelled upward below the liquid level (S) of
The antifreeze liquid (4) in the heat receiving tube (3) is convected upward from below by the heat at the bottom of the heat receiving tube (3) heated by geothermal heat, and the bubble generating chamber is formed by the convective antifreeze liquid (4) (22a) A tank storage liquid freeze prevention device characterized in that heating is possible.   2. The tank storage liquid freeze prevention device according to claim 1, wherein a bubble generating chamber (22a) having an outlet diameter of 1 mm or more is provided in the heat receiving portion (22) of the heat pipe (2).   The at least one spare bubble generation chamber (22a ') is provided below the bubble generation chamber (22a) of the heat receiving part (22) of the heat pipe (2). Anti-freezing device for tank reservoir liquid.   The tank storage liquid freeze prevention device according to any one of claims 1 to 3, wherein a lid member (31) having heat insulation is attached to a top portion of the heat receiving cylinder (3).   In the heat pipe (2), the riser pipe (24) and the downfall pipe (25) connecting the underground heat receiving part (22) and the heat radiating part (21) in the tank are covered with heat insulating material (26), and the influence of the outside temperature The tank storage liquid freezing prevention device according to any one of claims 1 to 4, wherein the tank storage fluid freezing is not received. A tank body (1) capable of storing a liquid therein; a heat receiving tube (3) having heat conductivity and buried in the ground; and an antifreeze liquid accommodated in the heat receiving tube (3) (4) and an annular heat pipe in which a substantially U-shaped heat receiving portion (22) is immersed in the antifreeze liquid (4) and a heat radiating portion (21) is disposed in the tank body (1). (2)
Further, the heat pipe (2) contains the heat transfer liquid (23) in the heat receiving section (22), and the heat transfer liquid (23) in one vertical tube of the U-shaped heat receiving section (22). By providing a bubble generation chamber (22a) that bulges upward below the liquid level (S) of
The antifreeze liquid (4) in the heat receiving tube (3) is convected upward from below by the heat at the bottom of the heat receiving tube (3) heated by geothermal heat, and the bubble generating chamber is formed by the convective antifreeze liquid (4). (22a) A liquid storage tank having a heat retaining function characterized in that heating is possible.