JPH07305996A - Heat exchanger for closed type wet cooling tower - Google Patents

Abstract

PURPOSE:To enhance heat exchange efficiency by controlling direction of passing air and sprayed water by arranging a water/air guiding means in a serpentine piping block having a network construction which the water and air are allowed to pass through. CONSTITUTION:In a heat exchanger, blocks 2 constituted of serpentine pipes arranged in close contact with each other are disposed in layers with evaporation heat exchanger filling material 3 with outlet side thereof being at an elevated position so that fluid in the serpentine pipes is allowed to flow in meander by means of U-shaped bent pipes provided at pipe ends from air outlet side to air inlet side. Because the serpentine pipes have an inclination formed by disposing the air outlet side thereof at an lower position, good draining can be performed. Within the blocks 2, matter to be cooled is made to flow from a header 1 in a counterflow direction of passing air (A). Guiding nets 10 are inserted at both the air inlet and air outlet sides in each of the blocks. The introduced air (A) passes through the interior of the blocks of each layer and is discharged by a fan 4. Sprayed water for cooling moves through the evaporation heat exchanger filling material 3 and the blocks 2, and is circulated for use.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger in a closed type wet cooling tower for cooling a primary fluid in a pipe by evaporating a liquid dispersed outside the pipe by forced draft.

[0002]

2. Description of the Related Art Conventionally, attempts have been made to improve the efficiency of a heat exchanger in a closed type wet cooling tower in which air is forced to flow sideways with respect to water sprayed on the outside of a cooling coil tube. , For example, Jitsuko Sho 59-3
In Japanese Patent No. 7573, as shown in FIG.
The object to be cooled that is supplied from and flows through the flexible tube 2 is air A
And the filler 3 for evaporative heat exchange are alternately arranged, and the filler 2 and the filler 3 are inclined and the water W is sprayed from above. Is listed. As a result, the water distribution during forced ventilation is good, the temperature difference can be made large, the temperature difference between the object to be cooled and the air wet bulb can be reduced, the heat exchange volume can be reduced, and the snake pipe can be prevented from bursting due to freezing even in severe winter. There is an advantage that you can.

Further, as shown in FIG. 4, a heat exchange flexible tube 2 is provided.
Is a block provided in several stages densely packed with each other, and the block is arranged between the evaporative heat exchanging fillers 3, whereby a structure with a more efficient heat exchange and a smaller volume is obtained. is there. Then, the blocked flexible tube 2 has the flexible tube 2 at the outlet side of the object to be cooled on the side opposite to the supply head 1 side, that is, so that the air in the flexible tube goes upward together with the flow of the object to be cooled in the flexible tube. If the inlet side of the passing air A is made high, the air in the flexible tube can be satisfactorily removed.

For this reason, the water sprayed from above easily flows in the downward slanting direction toward the side opposite to the inlet side of the passing air A, and furthermore, it is introduced from the high side of the slantingly arranged flexible tube block. Due to the generated passing air, a dry state of the cooling water occurs in the lower portion H of the flexible tube block on the high side, which lowers the heat exchange efficiency and causes corrosion. Further, when the spray liquid is increased in an attempt to eliminate this dryness, the spray fluid narrows the air passage, reduces the air flow rate, and reduces the efficiency of the heat exchanger itself.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to allow an object to be cooled supplied from a supply head to flow in a flexible pipe so as to face air passing therethrough, and to form a flexible pipe block and a filler block for evaporative heat exchange. In a heat exchanger of a forced-flow cross-flow type closed-type wet cooling tower in which water is sprayed from above, the heat exchange rate is controlled by controlling the flow direction of passing air and the flow of water to be sprayed. It is to provide a heat exchanger having improved heat dissipation.

[0006]

SUMMARY OF THE INVENTION According to the present invention, an object to be cooled supplied from a supply head is made to flow in a spiral tube so as to face the passing air, and the spiral tube block and the evaporative heat exchange filler block are alternately arranged. In the heat exchanger of the forced draft cross flow type sealed type wet cooling tower having a structure in which water is sprayed from above, water and air guide means are arranged in the flexible tube block.

As this guide means, any guide means can be provided so long as it does not substantially obstruct passage of spray water from above and passage of introduced air, and has a function of preventing the heat exchange coil at the passage air inlet portion from drying. For example, a high-strength synthetic resin mesh, a punching metal, a grid of stripes, or the like in an arbitrary net shape can be used.

The attachment may be fixed with a corrosion-resistant metal or resin material, or it may be fixed with a filler simply by inserting it into the tube group.

The present invention can be applied not only to the heat exchanger in which the above-mentioned flexible pipe block is arranged, but also to all forced draft type wet heat exchangers such as those having a structure in which conventional ordinary flexible pipes are arranged.

[0010]

A part of the liquid sprayed on the guide plate drops along the guide means while moving to the air inlet side. As a result, no dry surface is formed on the air inlet side of the flexible tube group.

[0011]

FIG. 1 shows an embodiment of the present invention, in which the present invention is applied to a heat exchanger having a flexible tube block.

This drawing is the same as the conventional example shown in FIG. 4, except for a net 10 made of a synthetic resin made of heat-resistant polypropylene and polyethylene, which is arranged on the air inlet side of the flexible tube group. In the heat exchanger, the block bodies 2 made of a flexible pipe arranged in close contact with each other are alternately stacked with the evaporative heat exchange filling material 3 and arranged at a high inclination on the outlet side. U bend (not shown) causes the air to flow in the pipe while meandering from the air outlet side to the air inlet side. The flexible pipe is inclined downward to the air outlet side and has a structure that allows good air removal and water removal. The material to be cooled is made to flow from the header 1 in the flexible tube block body 2 in a direction facing the passing air A. The guide net 10 has a 70% opening and is made of corrosion-resistant polyethylene.
It is inserted in each of the two tube groups at the outlet side. Then, the introduced air A passes through the flexible tube block body 2 of each layer and is exhausted by the fan 4. The cooling sprinkling water W flows down from the sprinkling mechanism 5 through the evaporative heat exchange filling material 3 and the block body 2, and is circulated and used by the pump 6.

FIG. 2 shows how the sprayed water W flows down. As shown in the figure, a part of the sprayed water W flows down along the net 10 arranged on the air inlet surface, and its pool is always
The air introduction side portion of the flexible tube block body 2 is not wetted and the portion is not dried.

The guide net on the air inlet side returns the sprayed water to the air inlet side to prevent the tube group from drying, thereby preventing a decrease in thermal efficiency. Further, the guide net on the air outlet side also prevents water from splashing to the air outlet side by the same action.

[0015]

The present invention has the following effects.

(1) It is possible to prevent uneven distribution of the sprayed fluid due to an increase in wind speed, inclination of the tube group, etc. with an inexpensive material, and
The degree of freedom in heat exchanger design can be greatly increased, and the heat exchange efficiency can be improved step by step.

(2) By preventing the heat exchanger from drying, adhesion of scale and corrosion of the coil are prevented.

(3) The surrounding environment is made comfortable by preventing water from splashing on the air outlet side.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention.

FIG. 2 shows a flow of sprinkling water in an embodiment of the present invention.

FIG. 3 shows a conventional example.

FIG. 4 shows another conventional example.

[Explanation of symbols]

 1 Coolant Supply Head 2 Flexible Pipe 21 Flexible Pipe Block 3 Evaporative Heat Exchange Filling Material 4 Wind Circulation Fan 5 Water Sprinkling Mechanism 6 Pump

Continuation of the front page (72) Inventor, Hidehito Tea Garden, No. 39 Ohori Park, Chuo-ku, Fukuoka-shi, Fukuoka Sora Ken Kogyo Co., Ltd.

Claims (2)

[Claims] 1. An object to be cooled supplied from a supply head is made to flow in a flexible tube so as to face the passing air, and flexible tube blocks and evaporative heat exchange filler blocks are arranged alternately, and water is sprayed from above. A heat exchanger for a forced-flow cross-flow type closed type wet cooling tower having the structure described above, characterized in that guide means for water and air are arranged in the meandering block. 2. The heat exchanger of a closed type wet cooling tower according to claim 1, wherein the guide means is a net shape through which both water and air pass.