JP4970962B2 - Evaporative cooling device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an evaporative cooling apparatus capable of preventing a lowering of heat exchange efficiency by preventing the formation of a boundary surface between a wet part wet with a cooling fluid and an unwet part to prevent precipitation of scale. <P>SOLUTION: A cooling circulation passage 3 is connected to a jacket part 2 of a reaction kiln 1. The cooling circulation passage 3 is connected to an ejector 6 through a valve 4. A plurality of partition spaces 26, 27, 28, 29 are formed on the outer surface of the reaction kiln 1. Cooling pipes 3, 5, 22, 24 are arranged facing the respective partition spaces 26, 27, 28, 29. The cooling fluid supplied from the cooling pipes 3, 5 puts only the partition spaces 26, 27 into a wet state and the partition spaces 28, 29 into a totally unwet state to prevent precipitation of scale. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

  The present invention relates to an evaporative cooling device that evaporates and cools an object to be cooled by the latent heat of vaporization of a cooling fluid to be supplied while a heat exchange chamber is in a low pressure state by a suction means.

  The evaporative cooling device has a plurality of cooling water injection nozzles attached to the tip of the cooling water supply pipe and injects cooling water from the injection nozzles into the heat exchange chamber so that the cooling water takes heat from the heat exchange chamber and evaporates -The object to be cooled can be vaporized and cooled by vaporization.

In this evaporative cooling device, when the object to be cooled is gradually cooled, the cooling is performed by reducing the number of cooling water spray nozzles, but if the number of spray nozzles is reduced in this way, the surface of the heat exchange chamber In other words, there are a mixture of a portion wetted by the cooling water and a portion not wetted, and water droplets or the like are deposited on the boundary surface between these portions, thereby reducing the heat exchange efficiency.
Utility Model Registration No. 2517217

  The problem to be solved is to prevent the precipitation of scale and prevent a decrease in heat exchange efficiency by preventing the occurrence of a boundary surface between the wetted part and the wetted part by the cooling water.

The present invention includes a heat exchange chamber for cooling an object to be cooled, a cooling fluid supply pipe for supplying a cooling fluid to the heat exchange chamber, and a plurality of injection nozzles for injecting the cooling fluid to the tip of the cooling fluid supply pipe. In addition to attaching the heat exchange chamber to the suction means and evaporating and cooling the object to be cooled by the latent heat of vaporization of the cooling fluid, a partition-like partition wall is arranged on the surface of the heat exchange chamber facing the plurality of injection nozzles Then, the partition wall is formed between the upper end portion and the lower end portion of the heat exchange chamber, and is attached so that the outer peripheral side end portion of the partition wall does not contact the inner peripheral wall of the heat exchange chamber. A partition space partitioned by is formed.

  In the evaporative cooling device according to the present invention, a partition space partitioned by a partition wall is formed on the surface of the heat exchange chamber facing the plurality of spray nozzles, so that the cooling fluid is sprayed from the spray nozzle facing the partition space. The partition space is entirely wetted, while the partition space where the cooling fluid is not jetted from the jet nozzle is not wetted, and a boundary surface between the wetted portion and the wetted portion may be generated. In addition, precipitation of scale can be prevented.

  In the present invention, a partition space is formed so as to face a plurality of injection nozzles. However, these combinations may be made so that one partition space is opposed to one injection nozzle, or one A plurality of injection nozzles can be opposed to the partition space.

  In the present embodiment, an example using a reaction kettle 1 that performs vaporization cooling as a heat exchange chamber is shown. An object to be cooled (not shown) placed inside the reaction kettle 1 is cooled by a cooling fluid supplied to the jacket portion 2.

  A jacket portion 2 is formed over substantially the entire circumference of the reaction kettle 1, and a valve 4 as a valve member is attached to the cooling circulation passage 3 from the right side of the jacket portion 2 and connected to the ejector 6. The diffuser part 7 of the ejector 6 is connected to the tank 8. The side of the tank 8 is connected to the circulation pump 10 through a pipe 9 and further communicated with the nozzle portion 12 of the ejector 6 through a pipe 11.

  The pipe 11 is branched to connect the cooling circulation passage 3. The cooling circulation passage 3 is also branched to connect the branch pipe 5 to the opposite side of the jacket portion 2. A valve 15 is also attached to the branch pipe 5.

  FIG. 2 shows an enlarged cross-sectional view of the reaction vessel 1 and the jacket portion 2 in FIG. As shown in FIG. 2, in this embodiment, the cooling circulation passage 3 is branched and a total of four cooling pipes 3, 5, 22, 24 are attached. Valves 25 and 17 are also attached to the cooling pipes 22 and 24.

  Although not shown, the nozzles are attached to the end portions of the cooling pipes 3, 5, 22, and 24 on the jacket portion 2 side, and the partition spaces 26, 27, and 28 are positioned at the outer surface of the reaction kettle 1 facing the respective injection nozzles. 29 are provided. The partition spaces 26, 27, 28 and 29 are formed by partition-shaped partition walls 31, 32, 33 and 34 attached to the outer surface of the reaction vessel 1. Each partition wall 31, 32, 33, 34 is formed on the outer surface of the reaction vessel 1 between the upper end portion of the jacket portion 2 and substantially the lower end portion, and the outer peripheral side end portion is formed on the inner peripheral wall of the jacket portion 2. It attaches so that it may not touch, and while preventing the cooling fluid supplied from cooling pipes 3, 5, 22, and 24 from adjoining the division space, it is a hindrance to sucking the vapor which vaporized in jacket part 2 Do not become.

  In the present embodiment, an example in which four partition spaces 26, 27, 28, and 29 are provided is shown. However, the number of partition spaces may be only two, or four or more depending on the size and shape of the reaction kettle 1. But it can be provided.

  Liquid such as cooling water in the tank 8 in FIG. 1 is circulated by the circulation pump 10, and circulates from the pipe line 11 to the tank 8 through the nozzle portion 12 of the ejector 6. A cooling fluid supply pipe 13 is connected to the upper left side of the tank 8. The cooling fluid supply pipe 13 is branched and a cooling fluid branch pipe 14 is connected to communicate with the cooling circulation passage 3.

  A vaporized steam and cooling fluid discharge pipe 19 is connected to the lower end of the jacket portion 2. In the discharge pipe 19, an opening / closing valve 20 and a vapor trap 21 capable of automatically discharging only the liquid to the outlet side without discharging the vapor are arranged in parallel, and suction of the nozzle portion 12 of the ejector 6 is performed. Connect with the part.

An excess fluid discharge pipe 23 is connected to the discharge side of the circulation pump 10 so that the liquid level in the tank 8 can be maintained within a predetermined range.

  When cooling the heat exchanged material in the reaction kettle 1, the circulation pump 10 is driven to supply a part of the cooling fluid in the tank 8 from the cooling circulation passage 3 to the jacket portion 2, and also to the ejector 6. By supplying a cooling fluid and generating a suction force by the ejector 6, the inside of the jacket portion 2 is brought into a predetermined pressure state, for example, a vacuum state below atmospheric pressure. By evaporating by taking the heat of the cooling material, it can be vaporized and cooled by the latent heat of vaporization. The vaporized vapor and the remainder of the cooling fluid evaporated and evaporated by taking the heat of the object to be cooled in the jacket portion 2 are sucked into the ejector 6 from the on-off valve 20 and the steam trap 21 and reach the tank 8.

  In FIG. 2, for example, when supplying the cooling fluid only from the cooling pipes 3 and 5, only the entire outer surface of the reaction kettle 1 in the compartment spaces 26 and 27 is wetted, while the compartment spaces 28 and 29 are provided. Since this part is not wetted at all, a boundary surface between the wetted part and the wetted part is not generated, and therefore, the deposition of scale can be prevented.

  When the object to be cooled in the reaction kettle 1 must be rapidly cooled, a predetermined low temperature cooling fluid is directly supplied from the cooling fluid branch pipe 14 in FIG. 1 to the cooling circulation passage 3 without passing through the tank 8. By supplying, an object to be cooled can be rapidly cooled.

The block diagram which shows the Example of the vaporization cooling device of this invention. FIG. 2 is an enlarged sectional view taken along line AA in FIG. 1.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Reaction kettle 2 Jacket part 3 Cooling circulation path 4 Valve 5 Cooling pipe 6 Ejector 8 Tank 10 Circulation pump 12 Nozzle part 13 Cooling fluid supply pipe 14 Cooling fluid branch pipe 20 On-off valve 21 Steam trap 22 Cooling pipe 23 Excess fluid discharge pipe 24 Cooling pipes 26, 27, 28, 29 Compartment spaces 30, 31, 32, 33 Compartment walls

Claims (1)

A heat exchange chamber for cooling the object to be cooled, a cooling fluid supply pipe for supplying a cooling fluid to the heat exchange chamber, and a plurality of injection nozzles for injecting the cooling fluid to the tip of the cooling fluid supply pipe are attached, In the one in which the exchange chamber is connected to the suction means and the object to be cooled is vaporized and cooled by the latent heat of vaporization of the cooling fluid, a partition-like partition wall is arranged on the surface of the heat exchange chamber facing the plurality of injection nozzles, A partition wall is formed between the upper end portion of the heat exchange chamber and the lower end portion, and is attached so that the outer peripheral side end portion of the partition wall does not contact the inner peripheral wall of the heat exchange chamber . An evaporative cooling device characterized in that a compartment space is formed.

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