JPS6069488A - Cooling water tower - Google Patents

Abstract

PURPOSE:To improve the dissipation of the white mist by providing outside air inlets along the circumferential wall of a casing and in the tangential direction relative to a ventilating duct, and disposing a cooling section in such inlets. CONSTITUTION:The outside air is drawn by a fan in a ventilating duct 5 from inlets 7 to wet cooling sections 8, and is further directed into a cooling water tower 4. While passing through the wet cooling sections 8, a direct contact heat exchange takes place with the hot water to be treated to cool down same. In this manner, the resulting damp air moves in a spiral flow on account of the inlets 7 that are directed in the tangential direction relative to the ventilating duct 5, and the joining and mixing with the outside air (a) from respective inlets 7 are enhanced. Therefore, the thermal condition in the ventilating air flow is equalized, and the ventilating, lifting air flow is so stabilized that it lifts higher up to improve the dissipation of the white mist.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cooling tower that cools hot water to be treated using outside air, and particularly relates to a cooling tower in which the outside air flowing into the tower is given directionality to improve the dispersion of white smoke.

Cooling towers are widely used as a cooling system for water shortages that occur in petrochemical plants, oil refineries, steel mills, thermal power plants, geothermal power plants, etc.

This cooling system is generally a wet cooling system that directly exchanges heat between the hot water to be treated and the outside air to cool the hot water to be treated. Since it becomes air and is blown out by the fan, if the moisture in the air is in the supersaturated region C', 1-4I, the problem of white smoke may occur. This whitening of the exhaust gas is caused by the temperature difference between the hot water to be treated and the outside air, and is noticeable in winter.

Normally, cooling water towers are required to adapt to the surrounding environment depending on the location, but for example, a cooling tower for geothermal power generation that is located in a national park may cause white smoke. There are 4C problems that can destroy the surrounding environment, such as fallen trees, low rainfall, and visual pollution. .

Therefore, with d3 in conventional wet cooling towers, there is a method to prevent white smoke formation.
Although F does not come, as shown in Fig. 1Δ and Fig. 113, there is i! on Yl around the housing of the cooling tower. IJ formula r<”+
141 part 2 b41. Arranged like a sword, both are double+ll+
tjl state j? - Form the exhaust stack 3 with one body, and make the M-viewpoint from the top of the tower rise to the sky, so that the white smoke will not spread at low altitudes, thereby avoiding the influence of the white smoke on the environment. are doing.

However, even if the wet cooling sections 2 are simply arranged radially, the mixing of the outside airflow passing through them within the tower is not necessarily sufficient, and the thermal state inside the outside airflow discharged from the exhaust stack 3 may be unstable. It is stable. For this reason, the rising airflow coming out of the exhaust stack 3 also became unstable, and the white smoke could not rise and diffuse above the height of the tower.

This invention was made in view of the above circumstances, and its purpose is to reduce the impact of white smoke on the environment by raising the humid air generated in the workplace higher into the sky, and also to reduce the impact of white smoke on the environment. The goal is to obtain a cooling water tower that can strengthen the power and improve the performance of the cold water tower.

In order to achieve the above object, the present invention provides a cooling water tower in which a cylindrical 1 dl cylinder is mounted on the top of a casing, and outside air that has flowed into the inside from the casing peripheral wall is extracted from the exhaust pipe, the peripheral wall of the casing A plurality of cold kJs are provided along the 471 cylinders, and they are oriented toward the cutting line of the 471 cylinders for cooling the outside air inlet treatment hot water.
It is characterized by having a section. This makes it possible for the inflowing outside air to become a swirling flow inside the tower and release a stable airflow from the exhaust stack, making it possible for the humid air generated inside the tower to rise higher into the atmosphere and spread. This was done to prevent white smoke from rising low in the sky.

Hereinafter, preferred embodiments of the cooling water tower according to the present invention will be explained using a wet cooling tower as an example.

As shown in FIG. 2, a cooling water tower 4 has a cylindrical exhaust pipe 5 on its casing peripheral wall.

If it is a forced-use model, I〕+Ki j? A large number of fans (not shown) are installed in the fan 15, and as the fan rotates, outside air is sucked into the tower 4 from the recasing peripheral wall 6, and the sucked outside air is discharged from the counter cylinder 5. It's true.

The casing peripheral wall 6 has a small number of inflow lowers adjacent to each other along the peripheral wall to cover the inflow of outside air. , one inlet (1-17) is oriented in the tangential direction of the exhaust stack 5 in order to create a swirling flow in the same direction of the outside air that has entered the inside of the exhaust pipe 5. A wet cooling section 8 for cooling the hot water to be treated by direct heat exchange with outside air is provided in each inflow lower, and a louver 9 for guiding outside air is provided on the front side of the wet cooling section 8. 67 Section 1I Section 8 As for the arrangement on the peripheral wall 6, in the illustrated example, the inflow D7 is straight, so it is polygonal, but the inflow lower is curved and the cooling) 11 part 8 is arranged in a circular shape. You may also do so.

The operation of this embodiment having the above configuration will now be explained.

A fan in the exhaust pipe 5 causes outside air to flow from the inflow lower through the wet cooling section 8 into the salt 4 as shown by arrow a.

When the outside air passes through the wet cooling section 8, it directly exchanges heat with the flowing hot water to be treated, thereby cooling the dry water to be treated. The outside air that has cooled the drought water to be treated becomes humid air and flows into the salt 4, but due to the inflow 1]7, it is directed in the tangential direction of the exhaust pipe 5.
Since the salt 4 is pulled up, it becomes a clockwise (or counterclockwise) swirling flow within the salt 4.

Then, it joins with other outside air a that also flows in from another inflow lower and becomes a swirling flow, and is discharged from the exhaust pipe 5 by 111 air.

Therefore, it passes through the wet cooling section 8.1. - Since the outside air becomes a swirling flow in the same direction, it is mixed with the Jg 4 inner metal body at various places, and mixing is promoted. This promotion equalizes the thermal conditions inside the +J+ outlet airflow from the IJI cylinder 5, so compared to the conventional system in which the cooling section 8 is rearranged in a radial IJ arrangement, the exhaust air and upward airflow are more stable and flow higher into the sky. It is possible to increase the As a result, the white smoke generated within the convex portion 4 can be carried upwards into the sky, resulting in good dispersion.

On the other hand, since the swirling flow in the chamber 4 helps create negative pressure in the basin 4, the outside air suction force from the wet cooling section 8 is improved,
Cooling performance can be improved as much as possible.

In this way, the inflow lower facing the tangential direction of the 4JI air fishing 5 is installed in the Keikun Shuto ￥0, and the outside air passes through the wet cooling section 8 in the inflow lower. Inside 14 (-171 from exhaust stack 5 while rotating) Improves outside air suction power, improves cooling performance, and allows moisture to be spread higher into the sky. Therefore, the impact of white smoke on the environment can be effectively avoided.

In addition, although the above-mentioned embodiment shows an example of a forced draft type wet cooling water tower, this invention is not limited to this, and a natural draft type may be used. By arranging the dry cooling section and the dry cooling section alternately, the humid air and dry air are sufficiently mixed, and the humid air is lowered from the supersaturated region to the unsaturated region, thereby effectively preventing the production of white smoke itself. You can also do that.

In summary, the present invention exhibits the following excellent effects.

(1) Since the inlet containing the cooling section is provided in the tangential direction of the exhaust stack, mixing of outside air passing through the cooling section is promoted compared to conventional systems in which the cooling section is arranged radially. The generated humid air can rise and spread higher into the sky,
The negative impact of white smoke on the environment can be effectively avoided.

(2) Furthermore, since the negative pressure in the plant increases and the force of sucking in outside air in the cooling section increases, cooling performance can be improved.

[Brief explanation of the drawing]

1A and 1B are a schematic sectional view and a schematic plan view, not showing a conventional cooling water tower, and FIG. 2 is a schematic plan view showing a preferred embodiment of the cooling water tower according to the present invention. In the figure, 4 is a cooling water tower, 5 is an air volume, 6 is a casing peripheral wall, 7 is an outside air inlet, 8 is a cooling part, and a is outside air. Patent Applicant: Ishikawajima wA@ju” Baku Co., Ltd. Ne1 Representative Patent Attorney: Haku Yu Kinutani

Claims (1)

[Claims] In a cooling water tower that has a cylindrical exhaust pipe at the top of the casing, and outside air that has flowed into the inside from the casing peripheral wall is discharged from the exhaust pipe, γ is attached to the peripheral wall of the casing.
17I: A plurality of outside air inlets that meet each other and are provided in the tangential direction of the exhaust stack, and a cooling section that is provided in these inlets to be in contact with the outside air and that cools the hot water to be treated.
The signature cold water tower.