JP5626522B2 - Flowing film heat exchanger - Google Patents

Description

  The present invention relates to a heat exchange device, for example, to a device that cools a high-temperature fluid by heat exchange with a refrigerant such as tap water while flowing down in a liquid film by its own weight.

  Currently, there are a shell pipe type and a plate type in the countercurrent type which is the mainstream of heat exchangers. In the shell pipe type, a refrigerant is passed through a pipe bent in a U-shape or a spiral shape, and is stored in a tube or container containing high-temperature water to perform heat exchange. In the plate type, heat exchange is performed by alternately flowing high-temperature water and low-temperature water through a heat transfer plate having a plurality of grooves formed by press working. In addition, there are a throw type and a coil type heat exchanger in which a liquid for heat exchange is put in a container and a spiral tube through which a medium flows is put.

  In addition, as a large heat exchanger such as an industrial cooling water heat exchanger, a cooling tower or a chiller is used, but the facilities and cost are excessive. Since one cooling tower cannot achieve the desired sufficient cooling, several units are required and a large water tank for storing cooling water is required. The cooling tower is a system that flows water on the outer surface, cools the flowed water by blowing with a fan from above, and cools the inside of the radiator from the outside (outer surface). By changing to a liquid, heat is exchanged by using a heat transfer plate as a refrigerant at the boundary, and is used to cool a liquid at 20 ° C. to 30 ° C. that is not too hot. For example, it is used to keep the temperature of the circulating water (20 ° C. to 25 ° C.) constant. However, the amount of electricity used in summer is bulky and expensive. The weak point of the chiller is that the cooling effect temperature is −5 ° C. to −10 ° C. and the processing temperature is as low as within 30 ° C., and heat at higher temperatures cannot be exchanged. For example, a hot spring source 70 ° C. (15 liters / minute) cannot be lowered to 45 ° C. That is, a general chiller is used to cool a liquid at 20 ° C. to 30 ° C. that is not too hot.

  Conventionally, various cooling devices have been proposed for cooling freshly extracted coffee and tea beverages with hot water to a temperature suitable for drinking using a refrigerant. For example, there is a beverage supply machine in which a hot beverage is poured on a cooling plate and cooled (see Patent Document 1). Also, a beverage formed by an outer cylinder and an inner cylinder that can enter and exit the outer cylinder, a groove is formed between the outer cylinder and the inner cylinder, and the groove serves as a flow path for hot beverage. A supply device has also been proposed (see Patent Document 2). Furthermore, there is a beverage cooling device in which an injection container, a water cooling container, and an ice cooling container are stacked in order from the top, and a heat exchange pipe connected to the injection container is passed through the water cooling container and the ice cooling container in order (see Patent Document 3).

JP-A-57-31823 Japanese Patent No. 2846658 Japanese Patent No. 3101553

  However, the beverage supply machine of Patent Document 1 connects a cooling device from the back surface of the inclined plate, and cools down the hot coffee by flowing down on the inclined plate. In order to cool to a desired temperature, An excessive amount of equipment was required. In addition, the beverage supply device disclosed in Patent Document 2 requires a cooling pipe to be attached to the outer periphery of the outer cylinder and a cold storage material to be enclosed in the inner cylinder, which increases costs. The beverage cooling device of Patent Document 3 requires constant cleaning because the beverage component adheres to the heat exchange pipe. However, the longer the pipe, the greater the effort and the sufficient cleaning. There is a risk that it will be out of reach.

  In view of the problems of the prior art as described above, the present invention is not only capable of cooling a high-temperature fluid or heating a low-temperature fluid in a very short time while having a simple structure. It is an object of the present invention to provide a falling liquid film type heat exchange device that can easily and reliably perform cleaning of an attached site.

Therefore falling film heat exchanger of the present invention, a reverse trapezoid cone shape of the heat treatment fluid storage tank upward is opened, a flow under hole provided at the bottom of the該貯Tomeso, the reservoir consists of a hanging to a heat transfer medium flow pipe provided, the while distributed and flows down to the liquid film shape following the outer surface of the dropwise thermally treated fluid from the flow under through hole heat transfer medium flow pipe Den in falling film heat exchanger for heat transfer medium and the heat exchanger for circulating the heating medium flow pipe, the outer bottom surface of the reservoir, with the heat transfer medium flow pipe at the top, the passage of the object to be heat-treated fluid A first feature is that a pair of guide plates for forming a gap for controlling the flow rate is provided. In addition, the heat transfer medium flow pipe has a second feature of flowing the heat transfer medium from the bottom to the top. Furthermore, the heat transfer medium flow pipe has a third feature in that a plurality of pipes are connected at a predetermined interval, arranged vertically while being bent left and right, and connected by a flow-down plate that connects the pipes in the vertical direction. And

The heat exchange device according to the present invention has the following excellent effects.
(1) Heat transfer on the heated falling liquid film side is not affected by the liquid level, and can be exerted even under conditions of a small temperature difference.
(2) The local transmission coefficient on the falling absorption liquid film side is high.
(3) It can be used from exhaust heat or high-temperature water to low-temperature water, and the utilization rate of the thermal energy it has increases.
(4) Since the pair of guide plates are provided below the heat-treated fluid tank, the fluid that has flowed down can be reliably supplied to the surface of the heat exchange pipe without scattering.

  In other words, unlike conventional cooling towers, water droplets do not scatter around and can be installed in a small space. Also. Since the heat energy of the heat source fluid or exhaust heat can be used or recovered to a lower temperature, the volume of the required device can be reduced, the temperature efficiency can be improved, and the energy use efficiency can be improved.

It is a perspective view which shows one Example of the falling liquid film type heat exchange apparatus which concerns on this invention. It is a partially cutaway front view of FIG. FIG. 3 is a plan view of FIG. 2. FIG. 3 is a cross-sectional view taken along line AA in FIG. It is a front view which shows the other Example of the falling type liquid film type | formula heat apparatus which concerns on this invention. FIG. 6 is a plan view of FIG. 5. It is a front view which shows the inside of FIG. It is side surface sectional drawing of FIG. FIG. 6 is a right side view of FIG. 5. (A) is a top view which shows a slit, (b) is a top view which shows a heat exchange pipe. It is a bottom view of a box. FIG. 6 is a sectional view taken along the line BB in FIG. 5.

Next, embodiments of the present invention will be described based on the examples shown in the drawings, but it goes without saying that the present invention is not limited to the examples.
An appropriate amount of the liquid L1 for heat exchange is adjusted by the flow rate adjusting opening 4 and supplied downward. The liquid L1 supplied at the optimum flow rate is caused to flow down like a falling film outside the pipe through which the heat transfer medium L2 passes. Heat exchange can be performed with high efficiency by the synergistic effect of sensible heat transport by thinning and vaporization from the falling film surface.

  As shown in FIGS. 1 to 3, the heat exchange device 1 of the present invention is provided with an inverted trapezoidal cone-shaped fluid storage tank 3 on the upper part of a metal box 2 whose upper side is opened, and this storage In the center of the bottom of the tank 3, a plurality of dropping holes 4 that are flow-through holes are formed in the longitudinal direction. Below the storage tank 3, a heat exchanging unit 5 is erected in parallel with the dropping hole 4 and is held by a column 6. And the uppermost part of the heat exchange part 5 is clamped by a pair of guide plates 7, and the clearance gap part mentioned later is formed. In addition, a receiving tray 16 that receives a fluid to be heated, which will be described later, is formed at the lower portion of the heat exchanging section 5.

  The heat exchanging unit 5 is arranged in a loop by arranging a plurality of metal pipes 8 spaced apart in parallel, connected in a radial direction by a connecting plate 9, and connecting both ends by a U-shaped bent pipe 10. Is formed. The lowermost pipe 8 of the heat exchange unit 5 is connected to the heat transfer medium water inlet 11 attached to the side surface of the box 2, and the heat transfer medium drain port 12 is connected to the uppermost part of the heat exchange unit 5. The upper pipe 8 is connected, and the tap water injected from the heat transfer medium injection port 11 flows through the heat exchange loop from the lowermost part of the heat exchange unit 5 and is discharged from the heat transfer medium drain port 12.

  The arrow shown in FIG. 4 represents the movement state of the fluid thrown into the to-be-processed fluid storage tank 3. As shown in FIG. 4, a drip hole 4 is drilled in the center of the bottom of the treated fluid storage tank 3, and the treated fluid dropped from the dripping hole 4 runs along the surface of the pipe 8 of the heat exchange unit 5. Then flow down while creating a liquid film. At that time, scattering is prevented by the pair of guide plates 7, and the passage flow rate is controlled by passing through the gap 13.

  In the heat exchanging unit 5, a plurality of metal pipes 8 are connected in parallel in the vertical direction by connecting plates 9, and a cooling heat transfer medium is supplied through a lower square pipe 14. Further, a collecting plate 15 is disposed on the upper surface of the square pipe 14 so as to face the lowermost pipe 8 so as to prevent scattering of the liquid flowing down along the surface of the heat exchanging portion 5. The passage flow rate is adjusted by the gap 13 formed between the collecting plate 15 and the square pipe 14.

  In this configuration, the surface area of the heat exchanging portion 5 is the sum of the surface areas of the plurality of pipes 8 and the surface area of the connecting plate 9, so that the heat-treated fluid can be efficiently cooled. The material of the pipe 8 is preferably a material having good thermal conductivity and corrosion resistance, and its surface is preferably a mirror surface.

  A funnel-shaped receiving tray 16 is formed below the heat exchanging section 5, and a discharge port 17 is provided at the center thereof. Then, the cooling medium is circulated in the heat exchanging section 5 from the bottom to the top, and a high temperature food and drink liquid such as freshly drip coffee is put into the treated fluid storage tank 3 to cool in a short time. It can be cooled to the same level as water.

[Experimental Example 1]
The cooling effect of boiling hot water was confirmed using the cooling device of Example 1. While circulating tap water having a water temperature of 25 ° C. through the cooling device 1, 2 liters of boiling hot water was added from the upper tank. As a result of receiving the treated water discharged from the lower outlet and measuring the treatment time and the water temperature after treatment, the treatment time is 1 minute 40 seconds, the water temperature after treatment is 26 ° C, and the hot water is extremely short. It turns out that it can cool in time.

  FIGS. 5 to 12 show other embodiments of the apparatus of the present invention. The apparatus of the present invention is not limited to beverage cooling and source cooling, and is used in a wide range of fields as a heat exchange apparatus that requires moderate temperature adjustment. Is possible. For example, by using the cooling device of the present invention and a chiller in combination, the source of 70 to 95 ° C. and a flow rate of 30 to 50 liters / minute could be cooled to a discharge temperature of 35 to 40 ° C. The temperature of the source water was adjusted by adding water at a high temperature, and the source temperature of 65 ° C to 70 ° C and the flow rate of about 30 liters / minute were cooled to 40 ° C using this device. It is economically advantageous because it does not dilute the hot spring components and can reduce the cost of water supply. In the figure, 19 is a fluid input pipe to be processed, and 20 is a handle for gripping the upper lid 2a of the box 2.

Using a 20-stage apparatus of the present invention, the pipe 8 having a size of the heat exchange part 5 of 32 mm in diameter and 1000 mm in length was used for water cooling and heating treatment experiments in an atmosphere of 21 ° C.
[Experiment 2]
(Hot water cooling treatment)
Water temperature to be treated: 81 ° C
Flow rate (flow rate) 25 liters / minute Heat transfer medium temperature (cooling water temperature): 21 ° C.
Heat transfer medium flow rate: 20 liters / minute As a result, the temperature of the water to be treated was cooled to 36 ° C., and the cooling water was heated to 50 ° C.
[Experiment 3]
(Room temperature water heat treatment)
Water temperature to be treated: 20 ° C
Flow rate (flow rate) 20 liters / minute Heat transfer medium temperature (heating water temperature): 81 ° C
Heat transfer medium flow rate: 20 liters / minute As a result, the water temperature to be treated was heated to 52 ° C., and the heated water was cooled to 39 ° C.

  At present, boilers are indispensable heat exchangers in various industrial fields. It is used in various places, from hot spring facilities to agriculture, industry, and home use. For example, by using a hot spring directly heated by a boiler, hot spring components (sludge adherence) are not only excessively costly for maintenance due to failure / deterioration / attachment of the boiler, but also shorten the life of the boiler. Therefore, the apparatus of the present invention is used in combination to supply high-temperature water from the boiler as a heat transfer medium and circulate between the boiler and the heat exchanger, thereby preventing boiler failure and improving fuel efficiency. Also, exhaust heat from the boiler can be used. Furthermore, CO2 can be reduced by treating the exhaust heat to lower the exhaust heat temperature, which can contribute to environmental conservation problems.

In the food / beverage field, the product after the heat treatment is immediately cooled, so that the container can be immediately packed and the productivity is improved. In addition, rapid container packing prevents the flavor from being damaged. That is, the liquid heat exchanger can be used in a wide range of fields, and the application field can be expanded by changing the material of the apparatus.
For example,
Industrial: (cooling water, factory effluent, product cooling, PC cooling).
For agriculture and fisheries: (house boiler (heat efficiency is increased by circulating), hydroponics, geothermal cultivation, fish farming).
Manufacturing: (Beverages, liquor, shochu, dashi, tofu, ice / frozen food).
Facilities: (Recreational facilities such as hot springs, heated pools, health lands, accommodations, aquariums).
Medical / pharmaceutical manufacturing, heat exchanger for gas, steam, exhaust heat, heat exchanger using geothermal heat, boiler exhaust heat, steam treatment when drying wood, cleaning steam treatment.

DESCRIPTION OF SYMBOLS 1 Flowing liquid film type heat exchange apparatus 2 Box 2a Top lid 2b Door 3 Fluid storage tank 4 Flowing through-hole (dropping hole or slit)
5 Heat Exchanger 6 Strut 7 Guide Plate 8 Metal Pipe 9 Connection Plate 10 Bent Pipe 11 Heat Transfer Medium Water Inlet 12 Heat Transfer Medium Drain Port 13 Gap 14 Square Pipe 15 Processed Fluid Collection Plate 16 Processed Fluid Receptacle 17 Covered Processing fluid discharge port 18 Support leg 19 Fluid input pipe 20 Handle

Claims (3)

Consists of a inverted trapezoidal cone shape of the heat treatment fluid storage tank upward is opened, a flow under hole provided at the bottom of the該貯Tomeso, provided drooping into the reservoir and the heat transfer medium flow pipe and heat transfer medium and the heat exchanger for circulating the heat transfer medium flow pipe while distribution was and flow down to the liquid film shape conforming to the object to be heat-treated fluid to the outer surface of the heat transfer medium flow pipe dropwise from the flow under hole in falling film heat exchanger, the outer bottom surface of the reservoir, with the heat transfer medium flow pipe at the top, a pair of guide plates that form a gap for controlling the flow rate through the thermally treated fluid A falling film type heat exchange device characterized by comprising: 2. The falling liquid film heat exchange device according to claim 1, wherein the heat transfer medium flow pipe circulates the heat transfer medium from the bottom to the top. The heat transfer medium flow pipe is formed by connecting a plurality of pipes with a predetermined interval, arranging them vertically while bending left and right, and connecting them with a falling plate that connects the pipes in the vertical direction. Alternatively, a falling film heat exchanger according to claim 2.

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