JPH0429261Y2 - - Google Patents

Description

[Detailed description of the invention] A. Purpose of the invention (industrial application field) This invention relates to a cross-flow cooling tower having a blowdown function in order to efficiently manage the quality of cooling water in the cooling tower.

(Prior art) In cooling estimation, etc., where water that has been used once in refrigerators and various industrial equipment, etc. and has risen in temperature is cooled using a cross-flow cooling tower and then used as cooling water again, it is estimated that the water is cooled according to the heat exchange function of the cooling tower. , since some of the cooling water is cooled using latent heat of vaporization, calcium and magnesium ions in the cooling water become concentrated, making it easier for scale to precipitate.Also, in areas with air pollution, sulfur dioxide gas etc. The water quality changes and deteriorates, which can lead to breakdowns and damage to refrigerators, etc.

In order to prevent such scale formation and changes in water quality, conventional methods include adding chemicals such as water treatment agents to the cooling water, periodically replacing the cooling water manually, and using a method called blowdown. In other words, methods such as discarding some of the cooling water and adding new water are used, but the amount of cooling water exchange and blowdown,
Water quality maintenance and management, such as timing management, requires a great deal of effort and expense.

As a conventional technology that improves the above problems,
There is a blowdown device for a cross-flow type cooling tower disclosed in Publication No. 56-36992, but in this blowdown device, an opening adjustment tool is provided in the upper water tank of the cooling tower to adjust the amount of blowdown. Therefore, for each adjustment, the worker must climb up to the upper water tank located at a high place and adjust the opening adjustment tool underwater in an unstable position.It is therefore difficult to adjust the blowdown quickly and appropriately. I can't.

(Problem that the invention attempts to solve) Therefore, this invention has a simple structure for blowdown, and the blowdown work can be easily and quickly ensured without the operator having to climb to a high place to operate it. The purpose is to enable you to do so.

B. Structure of the invention (means for solving the problem) In order to achieve the above-mentioned problem, this invention is based on a cooling tower having an upper end opening in an upper water tank provided in the machine frame body of a cross-flow cooling tower. The downward discharge port provided at the lower end of the lowdown water conduit is located at the upper end of the opening of the overflow pipe in the lower water tank provided in the main body of the machine, and the upper end of the opening of the overflow pipe is opposite to the external drain pipe. It is movable in a horizontal plane with respect to the downward discharge port of the water conduit pipe, and can be fixed to the external drain pipe at any position, and the movement range of the upper end of the opening is as follows:
The cross-flow type cooling tower is characterized in that the cross-flow type cooling tower has a position ranging from a position where it completely overlaps with the downward discharge port of the water conduit pipe to a position where it completely separates in plan view.

(Operation) The operation of this device configured as described above will be explained next.

The heat exchange effect between the cooling water and the outside air in this cross-flow type cooling tower is similar to that in the conventional type.

At this time, when the cooling water tower is operated, the upper end of the opening of the overflow pipe is usually kept in a state away from the downward discharge port provided at the lower end of the blowdown water conduit pipe.

In this way, if some of the cooling water evaporates during continued operation and new cooling water needs to be replenished to compensate for the evaporated water, calcium ions, magnesium ions, etc. in the cooling water will become concentrated. If the concentration of air pollution increases and the water quality deteriorates due to the introduction of dust from the outside, the operation of the cooling tower should be temporarily stopped and workers should enter the cooling tower and repair the downward discharge installed at the lower end of the blowdown water pipe. The upper end of the opening of the overflow pipe located away from the outlet is moved in a horizontal plane, and the upper end of the opening completely overlaps the downward discharge port provided at the lower end of the blowdown water conduit, and in this position the overflow pipe is closed. the cooling tower is fixed, the operation of the cooling tower is restarted, and a predetermined amount of cooling water is received by the overflow pipe and discharged from the external discharge pipe to the outside of the cooling water circulation system, and then, again,
The operation of the cooling tower is stopped, the lower water tank is replenished with fresh water corresponding to the amount of discharged cooling water, the operation of the cooling tower is switched to normal operation, and normal operation is performed thereafter.

Next, in order to blow down the appropriate amount of cooling water at all times even while the cooling tower is in operation, the upper end of the opening of the overflow pipe is moved in a horizontal plane, and the upper end of the opening is connected to the lower end of the blowdown water conduit pipe. The water quality of the circulating cooling water is continuously measured, and the amount of wrap is continuously changed in response to the water quality, and the water flows into the overflow pipe and circulates. Appropriately adjust the flow rate of cooling water discharged outside the system and the flow rate ratio of cooling water returned to the lower water tank.

In addition, if the amount of blowdown is calculated from the deterioration of water quality after a certain period of operation, and the upper end position of the opening of the overflow pipe is fixed at a position corresponding to the amount of wrap, subsequent adjustments can be made at regular intervals. Sometimes it is done after.

(Example) Next, a typical embodiment of this invention will be described.

(First Embodiment) In FIGS. 1 and 2, reference numeral 10 is a frame body of an orthogonal cooling tower A having outside air intakes 10a in two directions, and an exhaust pipe is provided in the center of the frame body 10. 1
1 is provided, and an upper water tank 12 is arranged near the periphery of this exhaust pipe 11. This upper water tank 12
A large number of small watering holes are drilled in the bottom of the machine frame body 10, and a filling material 13 is filled directly below the upper water tank 12 with its outer edge facing the outside air intake port 10a. ing.

At the bottom of the upper water tank 12, the exhaust pipe 11 is installed.
The upper end intake port 15 of the blowdown water conduit pipe 14 is open and connected and fixed, and the blowdown water conduit pipe 14 is connected almost vertically from the upper end intake port 15 along the inner edge 16 of the filler 13. A short pipe 14b extending horizontally from this vertical pipe 14a is integrally connected to the lower end of the vertical pipe 14a, which is a part of the vertical pipe 14a.
A downward discharge port 1 formed at the tip of this short pipe 14b
7 is located above the lower water tank 18 of the orthogonal type cooling tower A provided directly below the exhaust pipe 11, and faces the open upper end 20 of an overflow pipe 19 piped into the lower water tank 18. 24 is an inspection door provided in the machine frame body 10 near the upper edge of the lower water tank 18.

The overflow pipe 19 is formed of an L-shaped pipe, and its horizontal pipe portion 21 extends outside the lower water tank 18, and is slidably fitted into the external drain pipe 22 in a watertight manner. The inner end of this horizontal pipe portion 21 rises vertically, and the tip of this rising portion 22 serves as the opening upper end 20 and constitutes a means for adjusting the movement of the overflow pipe. The range of movement of the horizontal pipe portion 21 of the overflow pipe 19 with respect to the external drain pipe 22 is such that the upper end 20 of the opening completely deviates from the position where it completely wraps with the downward outlet 17 of the Boolow Down water conduit pipe 14 when viewed from above. The horizontal pipe portion 21 can be fixed at any position by the frictional force between the sliding surfaces. If necessary, the horizontal pipe section 21 may be firmly fixed to the external drain pipe 22 within the lower water tank 18 in its adjusted movement position by means of a set screw 23.

(Second Embodiment) The second embodiment shown in FIG. 3 differs from the first embodiment in the movement adjustment means of the overflow pipe 19a, and the other parts are the same as the first embodiment.

The overflow pipe 19a is connected to the external drain pipe 26 via a rotation means 25 so as to be rotatable about its vertical axis O, and the range of rotation is such that the open upper end 20a of the overflow pipe 19a is connected to the Bouleau down water conduit pipe. 14, from a position where it completely overlaps with the downward discharge port 17 in plan view to a position where it completely separates, and can be fixed at any position.

This rotating means 25 is, for example, the external drain pipe 26
An annular groove 27 is formed over 360 degrees on the inner surface of the riser pipe 26a, and a groove 28 corresponding to the groove 27 is formed in the horizontal discharge side portion 19 of the overflow pipe 19a.
These grooves 27, 28 are carved on the outer peripheral surface of the downward arm portion 29a of the 90-degree elbow pipe 29 integrally connected to the
It is constructed by interposing an O-ring 30 between them. Even if instead of this O-ring 30, a set screw 31 pressed against this annular groove 28 is screwed into the riser pipe 26a in its radial direction (see FIG. 4), this rotation means 25 are the same.

(Operation of the embodiment) The operation of this embodiment configured as described above will be explained next.

The heat exchange effect between the cooling water and the outside air in this cross-flow type cooling tower A is similar to that of the conventional one.

At this time, when operating the cooling tower A, the opening upper ends 2 of the overflow pipes 19, 19a are usually
0 and 20a are set apart from the downward discharge port 17 provided at the lower end of the blowdown water pipe 14.

In this way, during continued operation, some of the cooling water may evaporate and new cooling water needs to be replenished to compensate for the evaporated water, or calcium ions, magnesium ions, etc. in the cooling water may evaporate. If the water quality deteriorates due to condensation and increased concentration, or if the water quality deteriorates due to the mixing of dust from the outside, the cooling tower A
The operator temporarily stops the operation of the machine, and the operator opens the inspection door 24 and enters directly under the exhaust pipe 11 in the machine frame body 10 to a position away from the downward discharge port 17 provided at the lower end of the blowdown water conduit pipe 14. The upper opening ends 20, 20a of the overflow pipes 19, 19a are moved in a horizontal plane, and the upper ends 20, 20a of the openings are completely wrapped with the downward discharge port 17 provided at the lower end of the blowdown water conduit pipe 14, and at this position. The overflow pipes 19, 19a are fixed, the operation of the cooling tower A is restarted, and a predetermined amount of cooling water is received by the overflow pipes 19, 19a and discharged to the outside of the cooling water circulation system through the external drain pipes 22, 26. After that, the operation of the cooling tower A is again stopped, the lower water tank is replenished with fresh water corresponding to the amount of discharged cooling water, the operation of the cooling tower A is switched to normal operation, and normal operation is performed thereafter.

Next, in order to always blow down an appropriate amount of cooling water even during operation of the cooling tower A, the opening upper ends 20, 20 of the overflow pipes 19, 19a
a in a horizontal plane, and the upper end of this opening 20, 2
0a is appropriately wrapped around the downward discharge port 17 provided at the lower end of the blowdown water pipe 14, the quality of the circulating cooling water is continuously measured, and the amount of wrap is continuously adjusted in accordance with the water quality. The ratio between the flow rate of the cooling water flowing into the overflow pipes 19, 19a and being discharged outside the cooling water circulation system and the flow rate of the cooling water flowing back into the lower water tank is adjusted appropriately.

In addition, the amount of blowdown is calculated from the deterioration of water quality after operation at a certain interval, and from this, the overflow pipes 19 and 19 are
If the position of the opening upper end 20, 20a of a is fixed, subsequent adjustments may be made at considerable intervals.

C. Effects of the invention In this invention, which is configured and operates as described above, a Boolowdown water conduit is provided at the lower end of the Bouleau down water conduit whose upper end intake port is open in the upper water tank provided in the machine frame body of the cross-flow cooling tower. A downward discharge port is located at the upper end of an opening of an overflow pipe in a lower water tank provided in the main body of the machine, and the upper end of the opening of the overflow pipe is located at the downward discharge port of the water conduit pipe relative to the external drain pipe. It is movable in a horizontal plane and can be fixed to an external drain pipe at any position, so that the range of movement of the upper end of this opening completely overlaps the downward discharge port of the water conduit pipe when viewed from above. From the position where it is attached to the position where it is completely removed, there is no need to climb up to the upper tank.
By simply moving the upper end position of the opening of the overflow pipe piped into the lower water tank near the ground, the amount of cooling water discharged from the discharge port into the overflow pipe can be changed in a stable manner, making it easy to adjust the amount of overflow. Can be adjusted quickly.

(Effects unique to the embodiment) In the first embodiment, the overflow pipe 19
The horizontal pipe portion 21 extends outside the lower water tank 18 and is slidably fitted into the external drain pipe 22 in a watertight manner, and can be fixed at any position, which makes the structure of the overflow pipe 19 complicated. The overflow pipe 1 is connected to the discharge port 17.
The upper end 20 of the opening 9 can be moved as appropriate in the horizontal plane from a position where it completely wraps to a position where it completely deviates.

In the second embodiment, the overflow pipe 19a is connected to an external drain pipe 25 via a rotating means 25.
Since the overflow pipe 19a is rotatably connected around the vertical axis O, the tip of the overflow pipe 19a can be connected to the discharge port 17 from above the lower water tank 18 within the machine frame body 10 of the cooling tower A with a small force. On the other hand, by swinging around the vertical axis O in a horizontal plane,
Simply open the upper end 2 of the overflow pipe 19a.
You can adjust the amount of 0a received and boolowed down to the floor without permission.

[Brief explanation of drawings]

The figures relate to this invention: Fig. 1 is a schematic diagram of the first embodiment, Fig. 2 is an enlarged vertical sectional view of the overflow pipe portion of Fig. 1, and Fig. 3 is similar to Fig. 2 of the second embodiment. FIG. 4 is an enlarged vertical cross-sectional view of the overflow pipe portion similar to FIG. 2 of the second embodiment. Explanation of the main symbols in the figure: 14...Boolow down water pipe, 17...Discharge port, 19...Overflow pipe.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A downward discharge port provided at the lower end of the Boolow Down water pipe whose upper end intake port is open in the upper water tank provided in the main body of the machine frame of a cross-flow type cooling tower. The overflow pipe is located at the upper opening end of an overflow pipe in a lower water tank provided in the main body, and the overflow pipe is arranged such that the opening upper end of the overflow pipe is movable in a horizontal plane relative to the downward discharge port of the water conduit pipe relative to the external drain pipe. The upper end of this opening can move from a position where it completely wraps with the downward discharge port of the water conduit pipe to a position where it completely deviates from the downward discharge port of the water conduit pipe. A cross-flow cooling tower characterized by: 2. A part of the boolow down water conduit pipe is a substantially vertical pipe along the inner edge of the filling material in the machine frame main body, and the tip of the end extending horizontally from the lower end of this vertical pipe is directed downward. A cross-flow cooling tower as set forth in claim 1 of the utility model registration claim, which serves as a discharge port. 3. The horizontal pipe portion of the overflow pipe extending outside the lower water tank is slidably fitted into the external drain pipe in a watertight manner, and can be fixed at any position, and the inner end of the horizontal pipe portion 2. The cross-flow cooling tower according to claim 1, wherein the rising portion vertically rises, and the tip of this rising portion constitutes a movement adjustment means for the overflow pipe as the upper end of the opening.