JPS6314278B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for introducing air into a mixing chamber of a dry/wet cooling tower, and in particular, a method of introducing humid air into the mixing chamber from the bottom of the mixing chamber by dividing it into stripes to form a moist air layer in the mixing chamber. At the same time, by flowing dry air almost horizontally from the side of the mixing chamber between these moist air layers, it is possible to promote the mixing of dry air and humid air in the mixing chamber, and prevent the exhaust air from turning into white smoke. This invention relates to a method of preventing air from flowing into a mixing chamber of a dry/wet cooling tower.

Hot water discharged in large quantities from chemical plants and the like is cooled and reused, and dry/wet cooling towers are generally employed as devices for cooling such large amounts of hot water.

However, in conventional dry/wet cooling towers,
The mixing of humid air and dry air in the mixing room was not satisfactory, and high-humidity air was discharged without being mixed.Especially in winter, white smoke was generated from the discharged air, causing a pollution problem. . Next, a cooling tower using the conventional method will be described. As shown in Fig. 1, a conventional dry/wet cooling tower has dry cooling sections b provided above the cooling tower a and facing each other at a predetermined interval, and a dry cooling section b provided below each dry cooling section b. It mainly consists of a wet cooling section c, a mixing chamber d provided between the dry cooling sections b, and a water tank e provided at the bottom of the tower a. At the bottom of the mixing chamber d, a horizontal damper f having a pivot in the horizontal direction is installed at the bottom of the mixing chamber d.
A vertical damper g, which also has a pivot in the horizontal direction, is provided on the side of the dry cooling section b. An exhaust pipe i is provided on the upper wall h of the tower a, and a fan j is provided on the exhaust pipe i.

Air is sucked into the cooling tower a by the drive of the fan j, and when passing through the dry cooling section b, it indirectly exchanges heat with hot water from a plant etc. supplied to the dry cooling section b, and the warmed dry air D is vertically It flows into the mixing chamber d from the damper g. Further, the atmospheric air that has directly exchanged heat with the hot water supplied to the wet cooling section c becomes humid air W and flows into the mixing chamber d through the horizontal damper f.

However, since the dry air D is introduced from the entire side of the mixing chamber d or in horizontal stripes parallel to the bottom of the mixing chamber d, the dry air D flows into the exhaust pipe j as shown in Fig. 2. Most of the humid air W discharged from the circumferential side and flowing in from the horizontal damper f is discharged from the center of the exhaust stack j, and is also discharged from the area surrounded by the broken line in the figure at the center of the bottom of the mixing chamber d. The flow velocity was extremely slow and the space was a dead space, and the humid air W and dry air D were not mixed effectively. For this reason, highly humid air is discharged from the center of the exhaust stack j as shown by the diagonal lines in the figure, and in winter when the outside temperature is low, the steam in the discharged high humidity air is condensed and becomes white smoke. occurs in large quantities and becomes a pollution problem.

In order to prevent the exhaust from turning into white smoke, a method has been proposed in which the horizontal damper f is fully closed and the vertical damper g is fully opened when operating the cooling tower in winter.
If this is done, the suction of the louver k provided to take outside air into the wet cooling section c in the tower a will be reduced, a large amount of white smoke will leak outside from the surface of the louver k, and furthermore, this leaked white smoke will leak out from the surface of the louver k. Smoke from dry cooling section b
There was a problem that the particles could get into the air and reduce the cooling capacity.

The present invention has been devised to effectively solve the above-mentioned conventional problems.

The purpose of the present invention is to improve the mixing of dry air and humid air in the mixing chamber of a dry/wet cooling tower, to make the humidity of the discharged air uniform, and to prevent the exhaust air from becoming white smoke. The present invention provides a method for introducing air into a mixing chamber of a dry/wet cooling tower.

The method of the present invention will be explained in detail below with reference to the accompanying drawings. FIG. 3 is a side sectional view showing an example of an apparatus for carrying out the apparatus of the present invention, and FIG. 4 is a sectional view taken along the line AA in FIG.

In Figure 3, 1 is a dry/wet cooling tower,
Dry cooling units 2, 2 are provided in the upper part of the cooling tower 1, facing each other at a predetermined interval. The dry cooling unit 2 is provided with a large number of finned tubes (not shown). Wet cooling units 3, 3 are provided below the dry cooling units 2, 2, respectively, for further cooling the hot water cooled by the dry cooling unit 2.
The wet cooling section 3 is formed of a packed layer made of synthetic resin filling. A wet cooling section 3 is installed at the bottom of the tower 1.
A water tank 4 is provided for storing water that has been cooled.

A mixing chamber 5 is provided between the dry cooling sections 2, 2, and a horizontal wall having a pivot in the direction between the dry cooling sections 2, 2 is provided on the bottom wall 6 of the mixing chamber 5, as shown in an enlarged view in FIG. A plurality of dampers 7 are provided in series between the cooling sections 2, 2 (three in the illustrated example), and further such horizontal dampers 7 are arranged along the dry cooling section 2 at appropriate intervals. Further, on the side wall 8 facing the dry cooling section 2 of the mixing chamber 5, vertical dampers 9 having vertical pivots are provided at positions between the horizontal dampers 7 (in the illustrated example, the horizontal dampers 7 are also vertical dampers). 9 is also fully open). The cross section of the side wall 8 is formed into a mountain shape so that the dry air D from the dry cooling section 2 can be smoothly introduced into the mixing chamber 5.

Note that 10 is an exhaust pipe for discharging air from the mixing chamber 5 to the outside of the tower 1, and 11 is a fan for forced exhaust.

Next, the method of the present invention will be described based on the above specific example of the apparatus.

Hot water distributed from the plant system etc. into the tubes arranged in the dry cooling section 2 is supplied into the tower 1 and indirectly heat exchanged with the outside air passing between the tubes of the dry cooling section 2 via the tubes, and is cooled. and sent to the wet cooling section 3. The hot water sent to the wet cooling unit 3 is further cooled by directly exchanging heat with the outside air passing through the packed bed while flowing down the packed bed of the wet cooling unit 3. The cooled water is stored in the water tank 4 and returned to the plant system.

The outside air that has passed through the wet cooling section 3 becomes humid air W and rises inside the tower 1, and then flows into the mixing chamber 5 from a horizontal damper 7 provided on the bottom wall 6 of the mixing chamber 5 along the dry cooling section 2. The humid air flows into the mixing chamber 5 in a striped manner at intervals of , and upwardly moving moist air layers are formed in multiple layers at appropriate intervals. On the other hand, the dry air D that has passed through the dry cooling section 2 flows into the moist air layer in a substantially horizontal direction from the vertical damper 9 in a layered manner.

In this way, after the dry air D and the humid air W are macroscopically mixed by flowing into the mixing chamber 5 alternately in layers without interfering with each other, the dry air D and the humid air W are mixed. As a result, the humid air W is sufficiently mixed with the dry air D in the entire area within the mixing chamber 5, the humidity thereof is reduced, and air with uniform humidity is discharged from the exhaust stack 10.

Therefore, even in winter, it is possible to prevent the exhaust air from turning into white smoke, and furthermore, the wet cooling section 3 can be used effectively, so that the cooling capacity of the cooling tower can be increased. It has been confirmed in simulation experiments that the humidity distribution and flow velocity distribution of the air in the mixing chamber are almost uniform.

In addition, in FIG. 4 of the above embodiment, the horizontal dampers 7 are not provided at equal intervals along the side wall 8, but the horizontal dampers are provided at equal intervals, the intervals between the horizontal dampers are wide, and there are two vertical dampers. Only one sheet may be arranged in parallel.

As is clear from the above description, according to the present invention,
This improves the mixing of dry air and moist air, which prevents the exhaust air from the cooling tower from turning into white smoke even in the winter, and allows the wet cooling section to be used more effectively, increasing the cooling capacity of the cooling tower. Demonstrates excellent effects.

[Brief explanation of the drawing]

Figure 1 is a side sectional view of a cooling tower for explaining the conventional method, Figure 2 is an enlarged sectional view of the main part of Figure 1, and Figure 3 is an enlarged sectional view of the main part of Figure 1.
The figure is a sectional side view showing an example of a cooling tower for implementing the method of the present invention, and FIG. 4 is a sectional view taken along the line AA in FIG. 3. In the figure, 1 is a cooling tower, 2 is a dry cooling section, 3 is a wet cooling section, 5 is a mixing chamber, W is humid air, and D is dry air.

Claims (1)

[Claims] 1. In an air inflow method in which dry air and humid air from a dry/wet cooling section flow into a mixing chamber in a tower, humid air is divided into stripes at appropriate intervals and flows upward from the bottom of the mixing chamber. A moist air layer is formed in the mixing chamber, and dry air is introduced from the side of the mixing chamber in a substantially horizontal direction between the moist air layers.
A method for introducing air into a mixing chamber of a dry/wet cooling tower, characterized in that humid air and dry air are mixed in the mixing chamber.