JPS6089682A - Dry/wet cooling tower - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dry/wet type cooling water tower, and in particular, it is possible to lower the installation position of a high ml dry type cooling section consisting of a group of heat transfer tubes, and to improve dry type cooling NJ.
This invention relates to a dry/wet cooling water tower with a smaller and simpler supporting frame.

Dry/wet cooling towers are devices that cool and process hot water generated in plants such as chemical factories, steel mills, and power plants. , and a wet cooling section that performs direct heat exchange for cooling. FIG. 1 shows a conventional example of a countercurrent type dry/wet cooling tower that cools hot water by causing cold air rising to flow countercurrently to hot water flowing down a wet cooling section.

As shown in the figure, the upper side wall and the bottom side wall of the cooling tower a include
Outside air intakes (a) and (c) are provided at T&G, respectively, and a wet cooling part (d) having a packed bed through which hot water flows is provided in the middle part of the tower (a). Above the wet cooling part d, a water sprinkler @0 that sprays hot water is arranged. and,
The hot water that is sprayed from the sprinkler pipe e and flows down the packed bed of the wet cooling section d is cooled by direct contact with the outside air that is introduced into JLA from the intake port C at the bottom of the cooling tower a and rises up the packed bed. On the other hand, the hot water flowing down the packed bed of the wet cooling section d is cooled and the humid air containing a large amount of moisture flows into the plenum section f at the upper part of the tower a. In winter, if this humid air is released to the atmosphere from the exhaust stack Q, it will generate white smoke and cause a pollution problem. High-temperature dry air is introduced, mixed with the humid air, and then discharged from the exhaust stack Ω to prevent the exhaust from turning into white smoke.

By the way, the dry cooling section 1) consists of a large number of heat exchanger tubes for transferring hot water, and is installed in the brenum section at the top of the tower [because it is installed on the side wall, when increasing the capacity of the dry cooling section and increasing the air intake area. Since it is necessary to increase the height of the plenum part f, the tower height also increases, creating unnecessary space in the plenum part f. Furthermore, although the dry cooling section is heavy, in the conventional cooling tower a described above, the dry cooling section is installed at the top of the tower a above the wet cooling section d. For this reason, the frame i for supporting the dry cooling section 11 has become large, which not only increases the construction cost but also requires a large installation area.

The present invention was devised to effectively solve the above-mentioned conventional problems, and an object of the present invention is to increase the heat transfer surface area of a dry cooling section consisting of a group of heat transfer tubes to the height of a conventional water cooling tower. In addition, the installation position of the heavy dry cooling section can be lowered to the outside of the wet cooling section in the middle of the tower, making the supporting frame of the dry cooling section smaller and simpler, and its installation. The purpose of the present invention is to provide a dry/wet cooling tower that can save space.

According to the present invention, the above object is achieved by the following configuration. In other words, a dry cooling section is installed outside the wet cooling section in the middle of the countercurrent cooling tower via an air damper to lower the installation position of the dry cooling section, and the dry air from the dry cooling section and the wet cooling section are installed at a lower position. In order to mix the moist air from the inside of the tower at the upper part of the tower, the part of the packed bed facing the air damper is separated by a partition wall, and a water spray system is installed to spray dry water to each of the packed beds divided by the partition wall. During dry/wet operation, dry air from the dry cooling section is directly guided to the upper part of the column without flowing dry water into the packed bed section partitioned by the partition wall.

A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

In Fig. 2, 1 is a cylindrical cooling water tower.
An air damper 2 is provided on the bottom side wall of the cooling water tower 1, and an exhaust pipe 3 is provided at the center of the earthen wall of the cooling water tower 1 for venting outside air introduced into the tower to the atmosphere. Cooling tower 1 above air damper 2
89 wet cooling sections 4 are installed in the middle of the tower to partition the bottom of the tower and the top of the tower. The wet cooling section 4 includes
A filled layer S is filled with wood and the like and allows hot water to flow down. Further, an air damper 5 is provided on the side wall of the cooling tower 1 surrounding the wet cooling section 4, and a dry cooling section 6 is provided outside the air damper 5.

The dry cooling unit 6 consists of a group of heat transfer tubes for transferring hot water, and is placed on a frame 7 erected on a foundation.

The wet cooling unit 4 is provided with a partition wall 8 that partitions the packed layer S1 on the outer periphery facing the air damper 5.
The filled layer S of the portion 4 is divided by a partition g18 into a filled layer S1 on the outer peripheral side and a filled layer S+ on the other center side. In addition, an air damper 9 is installed at the bottom of the filling WJ S1.
is provided. Above the wet cooling section 4, a water sprinkling pipe T having a water nozzle for spraying hot water sent from a plant or the like to the wet cooling section 4 is arranged.

The water sprinkling pipe T is branched into a water sprinkling pipe T1 that sprays hot water onto the packed bed S, and a water sprinkling pipe T2 that sprays hot water onto the packed bed S. Further, a cold water tank 10 is provided at the bottom of the cold water tower 1 to store the cooling water that has been cooled in the wet cooling section 4.
A forced exhaust fan 11 is installed inside.

Next, the operation of this embodiment will be described.

First, normal wet operation (cooling of hot water is performed only by the wet cooling section 4) when there is no possibility that the exhaust gas from the cooling tower 1 will turn into white smoke, such as during summer, will be described. This situation during normal wet operation is shown in the left half of the cooling water tower 1 divided by the cooling tower axis C in FIG. A3 during normal wet operation
In this case, the air damper 5 is closed, the air damper 9 is opened, and the valve v1 of the water sprinkler pipe T1 is opened.

The hot water sent from Plan 1- etc. is supplied to the water sprinkler pipe T1.
T2 to the filled layers St and St of the wet cooling section 4, respectively, and the filled tat layer S1. ．． 'Buddha of Sz and flowed down,
On the other hand, outside air introduced into the field from the air damper 2 at the bottom of the cooling tower 1 rises through the packed beds Ss and St. Thus,
Filled bed S1. The hot water flowing down St is cooled by the rising outside air, and the cooled cooling water is stored in the cold water tank 10 and returned to the plant system, etc. On the other hand, the outside air that has cooled the hot water passes through the upper part of the tower. It is exhausted from the exhaust stack 3.

Next, a description will be given of dry/wet operation when hot water cooling of the dry cooling section 4 alone cannot avoid turning the exhaust air into white smoke, such as during winter. The conditions during this dry/wet operation are shown on the right half of the cooling tower 1, with the air damper 5 open and the air damper 9
is closed, and valve V1 is closed.

Since the valve V1 at the bottom 1 of the water sprinkler pipe is closed, the filled bed S1
No water is applied to the packed bed S1, and the packed bed S1 is in a dry state.

Therefore, the high-temperature dry air that has flowed into the packed bed S1 through the dry cooling section 6 and the air damper 5 rises through the packed bed St and reaches the upper part of the tower. On the other hand, while the outside air introduced into the tower from the air damper 2 at the bottom of the cooling water tower 1 rises through the packed bed S+, it is sprayed from the water sprinkler pipe T2 and the hot water flowing down the packed bed S+ is converted into cold Fil L, humid air. It flows into the upper part of the tower and covers it. The humid air from the packed bed S2 is mixed with the dry air from the packed bed S1 in the upper part of the tower, and is released into the atmosphere from the exhaust stack 3.The humid air mixes with the dry air, and Since it is discharged after the humidity has decreased, it does not produce white smoke.

In this way, the present invention makes effective use of the tower side wall around the outer periphery of the wet cooling section 4, which was in a closed state in conventional countercurrent type dry/wet cooling towers. The dry cooling section 6 is provided outside the damper 5. Therefore, the heavy dry cooling section 6 can be installed at a lower position in the middle of the cooling tower 1, at the same level as the wet cooling section 4. Therefore, since the side wall of the packed tank, which accounts for a large proportion of the side wall area, can be fully utilized, the heat transfer area of the dry cooling section can be widened and the design freedom is increased without increasing the tower height. The frame 7 that supports the cooling unit 6 can be made small and simple, its construction cost and installation space can be reduced, and the stability of the dry cooling unit 6 can be improved.

In summary, according to the present invention, space can be secured for the dry cooling section which requires a wide frontage area, and the installation position of the heavy dry cooling section can be lowered to the outside of the wet cooling section in the middle of the tower. The support frame of the dry cooling gJ section can be made smaller and simpler, and its construction cost and installation space can be reduced, providing excellent benefits.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of a conventional dry/wet type cooling water tower, and FIG. 2 is a side sectional view of an embodiment of the dry/wet type cooling water tower according to the present invention. In the figure, 1 is a cooling tower, 2, 5.9 are air dampers, 4 is a wet cooling section, 6 is a dry cooling section, 7 is a frame, 8 is a partition wall, S
, 81', S+ is a packed bed, T. T1 and T+ are water sprinkler pipes. Patent applicant: Patent attorney representing Ishikawajima-Harima Heavy Industries Co., Ltd.
Nobuo Kinuya

Claims (1)

[Claims] A wet cooling section has a packed bed that allows hot water sprayed from the top of the tower to flow down, and cools the hot water with cold air that flows in from the bottom of the tower and rises above the packed bed, and an air damper is provided outside the packed bed of the wet cooling section. a dry cooling section provided in the air tamper, a partition wall that partitions a portion of the packed bed facing the air tamper, and a water sprinkling system disposed to spray hot water to each of the packed beds divided by the partition wall. A dry/wet type cooling water tower.