JP2517097Y2 - Closed cooling tower - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION This invention has a plurality of hermetically sealed heat exchangers arranged substantially horizontally and arranged vertically in a cooling tower main body, and each closed heat exchanger has a supply part and a discharge part. The present invention relates to a closed cooling tower connected to a common supply header or discharge header.

[0002]

2. Description of the Related Art Various cooling towers of this kind have been developed on the market before the filing of this application.
An example is described in Japanese Patent No. 90764.

[0003]

In the closed cooling tower described in the above publication, in the heat exchange section, the bare tube of the cooling coil and the finned tube are installed in series in the air flow direction, and the side frame thereof is provided. However, if the cooling coil is damaged, the entire side frame is taken out from the cooling tower body and the cooling coil is installed. However, it is necessary to attach a fin plate to a part of a series of bare pipes to form a finned pipe, which is troublesome in manufacturing a cooling coil. In addition, if pinholes or slimes adhere to the finned tube, the entire cooling coil must be discarded, which increases the cost of the sealed heat exchanger.

[0004]

This invention is to solve the above-mentioned problems. A plurality of closed heat exchangers are arranged substantially horizontally in the cooling tower body, and they are arranged in a multi-tiered manner in the upper and lower layers. The supply part and the discharge part of the closed heat exchanger are detachably connected to a corresponding common supply header or discharge header, and the discharge header is located near the outside air intake of the cooling tower, and the supply header In the closed type cooling tower located near the exhaust port, the cooling coil constituting the closed type heat exchanger of each stage is supported by a tube spacer consisting of a bare tube and a finned tube, and the tube spacer is It is characterized in that it is drawn out from the cooling tower machine frame and replaced, and that the bare pipe and the finned pipe are connected in series in the air flow direction via a mixing header so as to be separable. It is preferable that the bare pipe and the finned pipe are supported by separate pipe spacers that are independent of each other, and the pipe spacers are independently drawn out from the cooling tower frame and arranged so as to be exchangeable. A twist plate for mixing the circulating cooling water may be vertically installed in the mixing header. In the middle of the cooling coil,
In some cases, an eliminator is interposed. The mixed header may be divided into at least two stages above and below. The finned tube portion may also be a bare tube. The mixing header may be integrally joined to one of the bare tube finned tubes.

[0005]

Next, the function of the closed cooling tower of the present invention as a white smoke prevention type cross-flow closed cooling tower will be explained together with the method of use. The heat exchanger unit in which the cooling coils at each stage are installed is arranged with the bare pipe on the discharge header side and the finned pipe on the supply header side, and the pipe spacers are arranged substantially horizontally in the cooling tower machine frame. That is, the primary side of the finned pipe is detachably connected to the supply header, the secondary side thereof is detachably connected to the mixing header by, for example, a union joint, and the primary side of the bare pipe is further connected to the discharge header, for example. The union joint is detachably connected, and the secondary side of the bare pipe is detachably connected to the discharge header.

1) In the case of summer and middle seasons, like the well-known cross-flow cooling tower of this kind, the first of the upper water tank,
The sprayed water is sprayed down from both the second water tanks onto a plurality of closed heat exchangers arranged hierarchically in the cooling tower body. On the other hand, the circulating cooling water was distributed and supplied from the common supply header provided near the exhaust port to the finned pipes on the supply side of each closed heat exchanger, and then simultaneously flowed into each mixing header and was decelerated here. After that, it is distributed and supplied into the bare tube on the discharge side on the opposite side, and is further sent to the common discharge header all at once to the load section. The circulating cooling water is indirectly cooled by the spray water when passing through the cooling coil. The sprayed water circulated and cooled in this way raises its own temperature, but with the contact between the sprayed water and the external airflow taken into the cooling tower body from the outside air intake in the direction orthogonal to the circulated and sprayed water, the sprayed water is vaporized. The sprayed water is slightly cooled by the effect of latent heat, sequentially flows down, and indirectly circulates the circulating cooling water in the closed heat exchanger again. Such circulating cooling water and spray water that is repeatedly subjected to heat exchange between air streams finally fall into the lower water tank, are collected, and are pumped up to the upper water tank by the pumping pump, and again on the closed heat exchanger group. Used for spraying.

2) In winter In this case, the opening / closing valve on the side of the second water tank is closed to
The spray water is sprinkled down only on the bare pipe of the closed heat exchanger located near the outside air intake from only the bottom of the water tank. At this time, the sprayed water is not sprayed on the finned pipe of the closed heat exchanger located directly below the second water tank and near the exhaust port. Therefore, the air immediately after being taken in from the outside air intake port comes into direct contact with the sprayed water, cools the sprayed water by the latent heat effect of its vaporization, raises its temperature slightly, and passes through the bare pipe of the sealed heat exchanger. Next, in the finned pipe of the sealed heat exchanger located below the second water tank in which the sprayed water is not sprinkled, the temperature of the temperature of the temperature of the sealed heat exchanger sent from the load section to the sealed heat exchanger via the supply header is reduced. The circulating cooling water in a high state indirectly contacts the air passing through this bare tube and is heated. Due to this heating, the temperature of the air becomes high and the relative humidity thereof is lowered, and the air is sucked toward the exhaust port and is not exhausted into supersaturated air, that is, does not become white smoke and is exhausted to the atmosphere. Note that, in claim 4, when the eliminator is vertically arranged at the boundary between the bare pipe and the finned pipe of the closed heat exchanger, that is, below the partition wall of the first water tank and the second water tank, the At the time of operation, the sprayed water sprayed from the first water tank collides and scatters on the surface of the bare pipe of the closed heat exchanger and rides on the air flow sucked from the outside air intake to flow to the exhaust port side with the eliminator. In the finned tube, the heat is trapped and the temperature of the air is raised while the heat exchanger surface is not wet.

When the heat exchanger is taken out of the cooling tower body due to regular cleaning of the cooling tower or damage to the closed heat exchanger, the common supply header, discharge header and the closed heat exchanger are disconnected and After pulling out the spacer from the cooling tower frame, taking out the heat exchanger to the outside of the cooling tower, cleaning it, and repairing and replacing other damaged parts, reverse the above-mentioned removal procedure and stack multiple heat exchanges up and down. The reactor is loaded into the cooling tower frame and the cooling tower operation is restarted. If necessary, separate the finned tube and the bare tube from the mixing header,
One of the severely damaged finned tubes and bare tubes may be removed and replaced.

According to the second aspect of the present invention, separate pipe spacers for supporting the bare pipe separated from the mixing header and the finned pipe are provided, the bare pipe side being the outside air intake side and the finned pipe side being the cooling tower. Pull out to the exhaust port side in the opposite direction and repair and clean the bare pipe and finned pipe outside the cooling tower. 4. The invention according to claim 3, wherein the circulating cooling water in each stage of the closed heat exchanger that flows in from the finned pipe side is once decelerated in the mixing header, and in this decelerated state, a spiral motion is made along the twisted plate. However, after the circulating cooling water in the upper and lower stages is slightly mixed, the circulating cooling water flows into the bare pipe all at once, and the passage time for flowing in one cooling coil is extended, and the indirect heat exchange time is extended.
According to the fifth aspect, the upper and lower stages of the mixing header are exchanged independently. In the device according to the sixth aspect, the same operation as in the first aspect is performed even in the bare tubes on the primary and secondary sides. According to the invention of claim 7, the connection of the heat exchanger of each stage to the mixing header is halved. According to the invention of claim 8, as in the case of a normal countercurrent type cooling tower, the cooling coils are loaded into the cooling tower in multiple stages, and spray water is sprayed on the cooling coils regardless of the seasons to cool them. The circulating cooling water flowing in the coil is indirectly cooled. When the cooling coil is replaced, the finned pipe and the bare pipe are removed from the mixing header, and the supply header and the discharge header are disconnected to remove the cooling coil together with the pipe spacer from the cooling tower.

[0010]

EXAMPLE Next, a typical example of the present invention will be concretely described.

Embodiment 1 (Representative Embodiment of the Invention According to Claims 1, 2 and 4) In FIG. 1, A is a cross flow type cooling tower, and in this cooling tower A, a closed heat exchanger is provided. A plurality of Bs are arranged substantially horizontally and are arranged vertically below the cooling tower upper water tank 10. The common discharge header 16 corresponding to the discharge part of each closed heat exchanger B is located near the outside air intake 17 of this cooling tower A, and the supply header 15 corresponding to the supply part of the heat exchanger B is exhausted. It is located near the mouth 19.
The upper water tank 10 is the first near the two outside air intakes 17.
The water tank 30 and the second water tank 40 near the exhaust port 19 are partitioned by a partition wall 50, and an opening / closing valve 42 is provided in a supply pipe for supplying spray water to the second water tank 40.

The closed heat exchanger B at each stage is equipped with a cooling coil 60.
The cooling coil 60 comprises a plurality of straight tubes 6 which are parallel to each other.
1 and a straight pipe 60a composed of a plurality of U-shaped curved pipes 62 that connect the straight pipe ends and form a circulating cooling water passage that meanders in a zigzag manner, a straight pipe 63 with fins, and a straight pipe 63 with fins. The fin-equipped pipe 60b is composed of a plurality of U-shaped curved pipes 64 that connect the ends and form a circulating cooling water passage that meanders in a zigzag manner. Each of the pipe spacers C1 and C2 that fits separately into each of the straight pipes 61 and 63 is made of an elongated material made of vinyl chloride and has a U-shaped cross section. 61, 63
Are supported parallel to each other at a predetermined interval and separately,
The pipe spacers C1 and C2 are set at positions that cover all the joint portions of the straight pipes 61 and 63 and the curved pipes 62 and 64 located at the left and right ends of the bare pipe 60a and the finned pipe 60b, respectively.

On the inner surfaces of the pair of left and right cooling tower support frames D facing each other, a number of spacer receiving members 65 corresponding to the number of the cooling coils 60 are hierarchically spaced by channel members having a U-shaped cross section. And the spacer receiving members 65 are integrally fixed to each other, and the spacer receiving members 65 are arranged substantially horizontally in the width direction of the supporting frames D in the spacer receiving members 66 of the pair of left and right supporting frames D. A pair of left and right spacers C1 and C2 of 60 are supported, and each spacer C1 and C2 is slidably supported in the width direction (see FIG. 3). The straight pipes 61, 63 and the curved pipes 62, 64 of each cooling coil 60 do not directly contact the support frame D, and a predetermined number of cooling coils 60 are vertically parallel to each other and support a pair of left and right cooling towers. It is erected and supported between the frames D via the tube spacers C1 and C2. At this time, the finned tubes 60b in all the cooling coils 60 are located on the blower 65 side of the cooling tower A, and the bare tubes 60a are located on the outside air intake 17 side, and common vertical supply and discharge headers 15 and 16 are provided. Is connected by a union joint (not shown). The primary side of the bare tube 60a and the secondary side of the finned tube 60b are detachably attached to a common vertical mixing header 20 via union joints. Further, the cooling coils 60 of the same shape arranged hierarchically are vertically aligned and arranged in the upper water tank 1.
In the portion directly below the partition wall 50 of 0, between the bare tube 60a of the heat exchange coil 60 and the finned tube 60b,
An eliminator 69 is provided vertically.

Embodiment 2 (Representative Embodiment of the Invention According to Claim 1) A difference from Embodiment 1 is that the two tube spacers C1 and C are used.
2 is a single spacer C0, and the bare pipe 60a and the finned pipe 60b are supported by the common spacer C0 (see FIG. 4).

In addition, the same reference numerals as those of the first embodiment indicate the same structure and operation.

Embodiment 3 (Representative Embodiment of Claim 3) The difference from Embodiment 1 is that a twisting plate 21 for mixing circulating cooling water is vertically installed and fixed in the mixing header in the axial direction of the header. (See FIG. 5). In addition, the same reference numerals as those of the first embodiment indicate the same structures and operations.

Embodiment 4 (Representative Embodiment of the Invention According to Claim 7) The difference from Embodiment 1 is that the primary (or secondary) of the bare pipe 60a (or the fin pipe 60b) in each stage of the mixing header 20 is different. The second side) is integrally molded, and the finned tube 60b
(Or the bare pipe 60a) is detachably connected via a union joint (see FIG. 6). Others are the same as those in the first embodiment.

Other Embodiments (Embodiments of the Invention According to Claims 5 and 6) This mixed header 20 has two header portions 22 on the upper and lower sides.
It is divided into a and 22b, and the cooling coil 60 is composed of a bare pipe 60c on the primary side and a bare pipe 60d on the secondary side (see FIG. 7), and the action of each of the embodiments is described in the corresponding claims. Since the operation is similar to that of the device, the description thereof is omitted here.
The operation of each of the embodiments is similarly applied to the countercurrent type cooling tower, and the operation of claim 8 is achieved.

[0019]

In the specified device, the bare pipe and the finned pipe are separately connected in series in the air flow direction through the mixing header so that the bare pipe and the finned pipe are separately manufactured in advance. In addition, it can be connected through the mixing header at the time of assembly, and the sealed heat exchanger can be easily attached to and detached from the cooling tower machine frame.

Further, by interposing the mixing header,
A change occurs in the flow of the circulating cooling water flowing in the cooling coil, and it is supplied from the finned pipe into the header for mixing and the speed of the circulating cooling water is once reduced again to cause the upper and lower circulating cooling water flowing in the adjacent cooling coils. After mixing them into a turbulent flow, they can be sent out to a bare pipe, and the time required for circulating cooling water to pass through one cooling coil can be increased compared to the conventional example without a mixing header. As a result, the indirect contact time between the sprayed water and the horizontal air flow and the circulating cooling water can be lengthened, and the circulating cooling water can be cooled more efficiently.

According to the second aspect of the invention, in addition to the effects of the specific invention, since the finned pipe and the bare pipe are supported by separate pipe spacers, when the finned pipe is deformed or damaged, the finned pipe is attached. Only the tubes can be separated from the header for mixing and drawn out of the cooling tower, and at the time of assembly, the finned tubes and the bare tubes can be separately assembled and loaded into the cooling tower through the tube space. . According to the third aspect of the present invention, a part of the circulating cooling water that has flowed into the mixing header from the finned pipe collides with a part of the twisted plate and spirally moves along the periphery of the twisted plate to the downstream side. Since it flows out to the bare pipe, it is possible to forcibly mix the circulating cooling water. According to the fourth aspect of the present invention, the eliminator catches water droplets that collide with the bare pipe and scatter in the winter, and prevents the smoke from flowing into and adhering to the outer peripheral surface of the finned pipe, thereby generating white smoke. It can be effectively prevented. According to the fifth aspect of the present invention, the circulating cooling water can be subdivided and mixed by the mixing header in each stage. According to the sixth aspect, the shape of the cooling coil can be simplified. In the structure described in claim 7, the time and effort for connecting one of the bare pipe and the finned pipe to the mixing header can be reduced to half compared to the other claims. Claim 8
In the described device, the effect of the above-mentioned specific device is exhibited even in the countercurrent type cooling tower.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a first embodiment.

FIG. 2 is a plan view of the sealed heat exchanger part.

FIG. 3 is an enlarged vertical sectional view of a spacer portion of FIG.

FIG. 4 is a plan view of a heat exchanger portion of a second embodiment.

FIG. 5 is a vertical cross-sectional view of a mixing header portion according to a third embodiment.

FIG. 6 is a schematic front view of a hermetically sealed heat exchanger according to a fourth embodiment.

FIG. 7 is a front view of a heat exchanger portion of another embodiment.

[Explanation of symbols]

 B Sealed heat exchanger 60a Bare tube 60b Finned tube

Claims (8)

(57) [Scope of utility model registration request] 1. A plurality of closed heat exchangers are arranged substantially horizontally in the cooling tower main body, and are arranged in a multi-tiered manner in a hierarchical structure, and a supply unit and a discharge unit of each closed heat exchanger are common to each other. Removably connected to the supply header or discharge header,
The discharge header is located closer to the outside air intake of the cooling tower, the supply header is a closed cooling tower located near the exhaust port, the cooling coil constituting the closed heat exchanger of each stage, It consists of a bare pipe and a finned pipe, and is supported by a U-shaped curved pipe portion on both sides of the pipe spacer. The pipe spacer is drawn out from the cooling tower machine frame and is exchangeably arranged. Is a hermetically-sealed cooling tower, which is separably connected in series via a mixing header. 2. The bare pipe and the finned pipe are supported by separate pipe spacers which are independent of each other, and the pipe spacers are independently drawn from and exchangeable with respect to the cooling tower frame, and the cooling tower is provided. 2. The closed cooling tower according to claim 1, wherein is a cross flow type. 3. The closed cooling tower according to claim 2, wherein a twisting plate for mixing the circulating cooling water is vertically provided in the mixing header. 4. The closed cooling tower according to claim 2, wherein an eliminator is provided between the cooling coils, and the cooling tower is of a cross flow type. 5. The closed cooling tower according to claim 3, wherein the mixing header is divided into at least two stages at the top and bottom. 6. The closed cooling tower according to claim 1, wherein the finned pipe portion is also a bare pipe. 7. The closed cooling tower according to claim 1, wherein the mixing header is integrally connected to one of a bare pipe and a finned pipe. 8. The closed cooling tower according to claim 1, wherein the cooling tower has a countercurrent flow.