JP3028428B2 - Crossflow cooling tower with white smoke prevention function - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cross-flow cooling tower having a function of preventing generation of white smoke in the middle and winter seasons.

[0002]

2. Description of the Related Art Cooling towers of this type are disclosed in
64, JP-A-2-50083, etc., have already been described and published, and have an initial white smoke prevention effect.

[0003] Among such prior arts, in the cooling tower described in Japanese Utility Model Laid-Open Publication No. 63-190765, the enclosed heat exchanger is divided into two in the direction of air flow, that is, in the depth direction of the cooling tower, to take in outside air. One of the mouth sides is constituted by a bare tube as a wet cooling unit, and the other on the exhaust port side is constituted by a finned tube as a wet / dry cooling unit. Therefore, in the middle and winter, watering to the finned pipe is stopped, and the circulating water is indirectly cooled in the bare pipe, and the high-temperature humid air is passed through the finned pipe, and the high-temperature circulation flowing through the finned pipe is performed. The humid air is heated with water to reduce its absolute humidity, and is exhausted as dry air from the exhaust port to reduce the generation of white smoke. The amount of air generated can be changed somewhat by increasing or decreasing the amount of water sprayed onto the bare pipe, but it is impossible to change it as much as twice or half.

[0004] Next, the cooling tower described in Japanese Patent Application Laid-Open No. Hei 2-50083 developed by the present applicant is filled with a synthetic resin wet heat exchanger and a synthetic resin dry heat exchanger, and the wet heat exchange is performed. Assuming that a cross-flow cooling tower having a white smoke prevention function, which is provided with a blower at an exhaust port for exhausting a mixed air of humid air passed through a vessel and dry air passed through a dry heat exchanger to the atmosphere, The air intake of the wet heat exchanger and the air intake of the dry heat exchanger face the same cooling tower outside air intake, and the air passage of the wet heat exchanger,
The air passages of the dry heat exchanger are parallel to each other, and these heat exchangers are stacked in several stages alternately with different types of adjacent heat exchangers. Also in this case, the aforementioned Japanese Utility Model Laid-Open No. 63-19076
4, the amount of dry air generated can be slightly changed by increasing or decreasing the amount of sprayed water to the heat exchanger. However, the amount of dry air must be greatly changed, such as twice or half. Is impossible.

If the change in the amount of dry air generated cannot be largely changed as in the above-mentioned prior art, the outside air temperature drops significantly, and a large amount of dry air, that is, the amount of air heating in a humid and humid condition during the rainy season. In some cases, it is not possible to cope with the case where the white smoke is required, and the function of preventing the generation of white smoke cannot be exhibited.

[0006]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems by improving the upper water tank and the closed type heat exchanger so that the amount of generated dry air can be greatly changed, the outside air temperature can be greatly reduced, and the outside air can be humid. It is an object of the present invention to provide a cross-flow cooling tower having a function of preventing white smoke, which can greatly change the amount of air heating and can exert a sufficient effect of preventing white smoke.

[0007]

In order to solve the above-mentioned problems, a specific invention is characterized in that hermetic heat exchangers are arranged vertically below an upper water tank, and supply ends of these hermetic heat exchangers are arranged. Is a cross-flow cooling tower connected to a common supply header on the exhaust port side, and a discharge end thereof is connected to a common discharge header on the outside air intake side, wherein the upper water tank has at least a width direction of the outside air intake port. The closed heat exchanger of each stage is divided into three watering portions, and each stage comprises at least three cooling coils independently arranged in parallel in the width direction of the outside air intake corresponding to each watering portion. These cooling coils are respectively connected to a common supply header and a common discharge header, and a supply pipe for supplying spray water to each of the water spray portions is provided with an on-off valve, respectively. There the cross-flow cooling tower having a capacity.

The upper water tank is divided into three sprinkling portions in the width direction of the outside air intake of the cross-flow cooling tower, and the closed heat exchangers at each stage correspond to the outside air intake corresponding to each of the sprinkling portions. It is preferable that the cooling coil is composed of three cooling coils arranged in parallel in the width direction, and of the three cooling coils, the center cooling coil is provided with a fin.

[0009] Of the three cooling coils, the cooling coils on both sides may be formed by interposing a filling plate made of synthetic resin between bare pipes vertically adjacent to each other.

[0010]

The common operation of the invention described in each of the above-mentioned claims is as follows. In summer, as in the case of this type of cross-flow type cooling tower, the water is sprayed from all the water spray parts to all the heat exchanger groups below, and the circulating cooling water circulating in the heat exchanger groups is indirectly cooled. Next, during the hot and humid period, such as during the rainy season in Japan, and during the winter period, when white smoke is likely to occur, the following effect is obtained.

[0011] The on-off valve provided on the supply pipe to the central sprinkling section is closed, and spray water is supplied from the supply pipe only to the sprinkling sections on both sides, and the spray water is circulated only in the heat exchange sections located on both sides. Perform indirect heat exchange with cooling water, indirectly cool spray water by air flow in this part, discharge it to the exhaust side as humid air, and in the central heat exchanger part, use no water spray and circulate cooling water. Indirectly discharges to the exhaust port as air-cooled heated air, rises as a mixed flow of humid air and dry air toward the exhaust port, discharges air from the exhaust port as a whole with high temperature and low humidity, and discharges in a non-supersaturated state Prevents white smoke.

Next, when increasing the amount of heated air, spraying water is performed only from the central spraying portion, and the spraying from both sides is stopped. To prevent the generation of white smoke.

At this time, the fin provided between the fins provides
Part of the circulating water sprayed on the circulating water sprayed on the heat exchange portions on both sides is blown out from the central heat exchange portion toward the exhaust port.

[0014] Circulating water is distributed from the common supply header to each cooling coil, cooled during circulation, and then discharged to the common discharge header and sent to the load section.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a typical embodiment of the present invention. In FIG. 1, A is a cross-flow cooling tower having a function to prevent white smoke. Several heat exchangers B are arranged in upper and lower layers. The supply ends of these closed heat exchangers are provided on a common supply header 12 on the exhaust port 11 side, and the discharge ends are provided on the outside air intake 13 side. Each is connected to a common discharge header 14. The upper water tank 10 is divided into three sprinkling portions 10a, 10b, and 10c in the width direction of the outside air intake 13, and the closed heat exchanger B includes the sprinkling portions 10a, 10b, and 1c.
0c, at least three heat exchange parts B1, B
2 and B3, which are partitioned in the width direction of the outside air intake 13, and supply pipes 15 for supplying spray water to the water spray portions 10a, 10b, and 10c are provided with open / close valves 16a, 16
b, 16c are provided.

At least three hermetically sealed heat exchangers are independently arranged in parallel in the width direction of the outside air intake 13 in correspondence with the water sprinkling portions 10a, 10b and 10c of the upper water tank 10.
The cooling coils B11, B12, and B13 of each stage are connected to a common supply header 12 and a common discharge header 14, respectively (see FIGS. 1 and 2). The three cooling coils B1
1, B12 and B13, the center cooling coil B12 is provided with a fin 23, and the cooling coils B11 and B13 on both sides of the cooling coil B12 are provided with a filling plate 25 made of synthetic resin between the vertically adjacent bare pipes 24. (See FIG. 3).

The operation of the above embodiment is the same as the operation of the invention described in the corresponding claims, and the description thereof will be omitted.

[0018]

The effects of the present invention constructed and operated as described above are as follows. In the specific invention according to claim 1, by appropriately selecting water spray from the water spray portion, the amount of air heating can be largely changed, the amount of dry air generated can be adjusted, and the generation of white smoke can be prevented. In other words, during the cold operation during the winter operation of the cross-flow cooling tower, during the humid period during the rainy season, a large amount of dry air is generated by reducing the watering area of the watering part, and this cooling tower exhaust port White smoke can be effectively eliminated.

Since the hot water (circulating cooling water) sent from the load section is distributed to the three cooling coils, the circulating cooling water flowing through each heat exchange section undergoes heat exchange independently of each other. When dry air is generated, a large amount of high-humidity dry air can be generated by effectively utilizing the temperature of the hot water having the high sound.

According to the second aspect of the present invention, together with the effect of the specific invention, the central cooling coil is provided with a fin, so that a part of the circulating water sprayed on the cooling coils on both sides is reduced by the air flow. This can prevent the phenomenon of invading the central cooling coil through a straight pipe or increasing the humidity of dry air.

According to the third aspect of the present invention, the structure of the cooling coils on both sides can be simplified, the cost thereof can be reduced, and the amount of dry air can be drastically changed as in the specific invention.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a cooling tower according to a first embodiment.

FIG. 2 is a schematic plan view of FIG.

FIG. 3 is a schematic front view of a main part viewed from an outside air intake side in FIG. 1;

[Explanation of symbols]

 10a, 10b, 10c Watering part B1, B2, B3 Heat exchange part 16a, 16b, 16c On-off valve

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F28C 1/14 F28C 1/04

Claims (3)

(57) [Claims] 1. A closed heat exchanger is arranged below the upper water tank in an upper and lower hierarchy, and the supply ends of these closed heat exchangers are connected to a common supply header on the exhaust port side and the discharge end thereof. Is a cross-flow cooling tower connected to a common discharge header on the outside air intake side, wherein the upper water tank is divided into at least three watering portions in the width direction of the outside air intake port, and a closed heat exchange of each stage is provided. The vessel comprises at least three cooling coils independently arranged in parallel in the width direction of the outside air intake corresponding to each of the watering portions, and these cooling coils of each stage are provided with a common supply header and a common discharge header. A cross-flow cooling tower having a white smoke prevention function, wherein each of the supply pipes is connected to each other and a supply pipe for supplying spray water to each spray portion is provided with an on-off valve. 2. The upper water tank is divided into three sprinkling portions in the width direction of the outside air intake of the cross-flow cooling tower, and the closed heat exchanger of each stage corresponds to the outside air intake corresponding to each of the sprinkling portions. 2. The white smoke prevention according to claim 1, wherein the cooling coil comprises three cooling coils independently arranged in parallel in a width direction of the mouth, and a center cooling coil of the three cooling coils is provided with a fin. Cross-flow cooling tower with functions. 3. The white cooling coil according to claim 2, wherein the cooling coils on both sides of the three cooling coils are formed by interposing a filler plate made of a synthetic resin between bare pipes vertically adjacent to each other. Crossflow cooling tower with smoke prevention function.