JP3073117U - Purification equipment for controlling the propagation of Legionella spp. In cooling water in a cooling water circulation system such as a cooling tower - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To purify cooling water in a cooling water circulation system such as a cooling tower capable of purifying the cooling water in addition to suppressing the growth of the Legionella genus of the cooling water. Get the device. SOLUTION: An ozone gas (negative ion) generator disposed inside or outside a cooling water tank and an ozone gas generated by the operation of the ozone generator are introduced into the cooling water of the cooling water tank through an air supply pipe. A gas-liquid mixer, a circulation pump disposed outside the cooling water tank, a solid-liquid separation device that absorbs water from the cooling water tank by operating the circulation pump, and separates and removes solids containing fine particles from the absorbed cooling water. The open side of the circulation channel that discharges the clear water that has passed through the liquid separation device to the cooling water tank and the circulation channel that discharges the cooling water into the cooling water tank is branched into two branches in parallel, and one of the pipes is discharged into the cooling water tank for cooling. A sedimentation preventer for turbulently stirring the cooling water in the water tank and a gas-liquid mixer connected to the other pipe.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention mainly suppresses the propagation of Legionella spp., A chlorin-resistant pathogen, which is a variant of bacteria resident in cooling water, in a cooling water circulation system such as a cooling tower. The present invention relates to a purification device for suppressing the propagation of Legionella spp. In a cooling water circulation system such as a cooling tower capable of purifying the cooling water.

[0002]

[Prior art]

 In Japan, the living environment, excluding depopulated rural areas, is surrounded by construction machinery and structures, including man-made buildings, structures, and various types of machinery, and is exposed to various environmental pollutions. Especially, in the cooling water system of air conditioners and refrigeration equipment, algae, microorganisms and bacteria are likely to be generated due to the environment and temperature conditions. Has been confirmed.

[0003] With regard to Legionella spp., Outbreaks of pneumonia caused by the causative bacteria have been reported from all over the world. There are two types of legionellosis: non-pneumonia and pneumonia.

[0004] One of the causes is that Legionella spp. Propagate in the cooling water of the cooling tower and scatter in the air, causing infection of nearby residents and passers-by.

[0005] As a countermeasure for such control, the Ministry of Health and Welfare issued a control standard in 1994 with an emphasis on situations, and issued a regulation to limit the number of Legionella bacteria in the cooling tower to 100 per deciliter. Many facilities are operated beyond regulatory standards.

[0006] Heretofore, each of the following means examined as a method for removing bacteria of the genus Legionella has respective disadvantages. That is, 1. Mixing chlorine agents into cooling water is highly corrosive to metals. 2. The use of various organic disinfectants in cooling water is a concern because it is toxic, and it is dangerous because it is scattered in the air as droplets. 3. The use of antibacterial metals (copper, silver) is expensive and practically difficult. 4. The ultraviolet treatment of the cooling water reduces the sterilizing effect as the ultraviolet transmittance of the cooling water decreases.

[0007] Therefore, there has been a demand for the development of an apparatus that can effectively and inexpensively control the propagation of Legionella bacteria in cooling water in a cooling water circulation system such as a cooling tower.

[0008]

[Problems to be solved by the invention]

 From this point of view, the present invention provides a cooling water circulation system, such as a cooling tower, that can suppress the growth of Legionella spp. It is an object of the present invention to obtain a purification device for controlling the propagation of Legionella bacteria in cooling water.

[0009]

[Means for Solving the Problems]

 The present invention has been made in view of the above point of view, and its main configuration is an ozone gas (negative ion) generator disposed inside or outside a cooling water tank, and an operation of the ozone generator. A gas-liquid mixer that guides the generated ozone gas into the cooling water of the cooling water tank through an air supply pipe, a circulation pump disposed outside the cooling water tank, and the cooling water tank that operates by operating the circulation pump. A solid-liquid separator that absorbs water and separates and removes solids containing fine particles from the absorbed cooling water, a circulation channel that discharges clear water that has passed through the solid-liquid separator to the cooling water tank, and cools the cooling water tank. A sedimentation prevention device that branches into two branches in parallel on the open side of the circulating water channel that discharges water, discharges water into the cooling water tank to one of the pipes, and turbulently flows and mixes the cooling water in the cooling water tank; It is intended to provide a Legionella breeding suppression purifying apparatus for cooling water in its other cooling water circulation system of the cooling tower such that the pipe gas-liquid mixer is connected to.

[0010]

[Embodiment of the invention]

 This will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention, in which an ozone gas (negative ion) generator 10 is disposed either inside or outside a cooling water tank 1 and is supplied with power to an outlet 11 connected to a power supply thereof. The ozone generator 10 operates to generate ozone gas. Further, an air supply pipe 2 for guiding the ozone gas generated by the ozone generator 10 into a gas-liquid mixer 20 disposed in the cooling water of the cooling water tank 1 is provided.

A circulating pump 30 is arranged outside the cooling water tank 1, and the circulating pump 30 operates by supplying power to an outlet 31 connected to the power supply. The circulation pump 30 is interposed with a solid-liquid separation device 40 that absorbs water from the cooling water tank 1 by the operation of the circulation pump 30 and separates and removes solids containing fine particles from the absorbed cooling water. A circulation channel 3 for discharging clear water, which is a return liquid from the solid-liquid separator (separating device) through the separating device 40, to the cooling water tank 1 is provided.

The circulating water passage 3 branches in parallel into two branches on the open side where the cooling water is discharged into the cooling water tank 1, and one of the pipes discharges the clarified cooling water into the cooling water tank 1. The sedimentation preventing device 50 for turbulently stirring the cooling water in the cooling water tank 1 is provided, and the other pipe is connected to the gas-liquid mixer 20 into which the similarly cooled cooling water is injected.

FIG. 2 shows an example of the configuration of a mixing blade 21 provided between the rotation shafts at both ends of an example gas-liquid mixer 20 used in one embodiment of the present invention along the rotation shaft direction. FIG. 4 is an explanatory view showing a portion, and constitutes a mixing blade in which right-handed element blades 22 having a right-handed twist and left-handed element blades 23 having a left-handed twist are alternately and integrally connected.

The ozone gas from the ozone generator 10 and the clarifying cooling water from the circulating water channel 3 through the other pipe are injected into predetermined portions of the inlet of the gas-liquid mixer 20 configured as described above. And the injection pressure splits the gas-liquid into two every time it passes through one element, and along the twisted surface from the center to the periphery of the vessel, and from the periphery to the center. The direction of rotation is reversed while the current changes, and a sudden reversal of the inertial force occurs at the reversal point. In the process where these physical actions occur continuously, the phenomenon of turbulent stirring naturally occurs, and the injected gas and liquid are mixed uniformly, whereby the ozone gas is dissolved maximally in the clarified cooling water. Then, the gas flows out from the outlet of the gas-liquid mixer 20 into the cooling water tank 1.

The Legionella spp. Inhabiting the cooling water tank 1 is killed by the ozone solution flowing out of the gas-liquid mixer 20 into the cooling water tank 1, thereby suppressing the growth of Legionella spp.

FIG. 3 is a schematic explanatory view showing a known internal configuration of the solid-liquid separation device 40. The cooling water absorbed from the cooling water tank 1 by the operation of the circulation pump 30 is tangentially directed from an inlet 41. And circulates in a vortex. Then, the cooling water is accelerated by passing through a tangentially provided slit-shaped rotating mechanism, and vigorously flows into the inside of the separation cylinder 42 disposed inside the cooling water. Therefore, the solid matter that is heavier than the liquid contained in the cooling water hits the inner wall 43 of the separation cylinder 42 due to the centrifugal force, and the separation of the solid matter and the liquid (primary separation) starts. The separated solids 44 slowly settle down along the inner wall 43 and accumulate in the lower collection chamber.

On the other hand, the liquid that has descended as a rotating vortex is instantaneously and rapidly decelerated by the lower guide blade mechanism 45, the velocity energy is changed to pressure energy, and further, solid-liquid separation (secondary separation) is performed. . The liquid (clear water) containing no solid matter by the solid-liquid separation rises rapidly by the central vortex 46 and is discharged from the outlet into the circulation channel 3.

The solid matter deposited in the lower collection chamber 47 is periodically or continuously discharged from the drain 48 as needed.

FIG. 4 is an external front view showing the structure of the sedimentation preventing device 50, FIG. 5 is a side view thereof, and FIG. 6 is an explanatory diagram showing the internal structure and operation thereof. A short pipe piece 51 fitted to one of the pipes on the open side of the circulating water passage 3 is provided at the center, and a nozzle part 52 having an inner diameter narrowed in a streamline shape is formed at the outlet at the tip thereof. In the extension direction of the part 52, an inlet part 53 opened like a trumpet with the tip of the nozzle part 52 facing the center, a body part 54 whose inner cavity is narrowed in a streamline shape, and an outlet part 55 that is expanded. An integrally formed diffuser 56 is located, and the pipe piece 51 and the diffuser 56 are integrally connected by a connecting arm 57 that extends integrally from a side surface of the pipe piece 51.

In the sedimentation preventing device 50, the clarified cooling water flowing into the pipe piece 51 from one of the pipes on the open side of the circulating water channel 3 vigorously flows from the narrowed nozzle portion 52 to the inlet portion 53 of the diffuser 56. From the water to the body 54, and at the same time, a negative pressure is naturally generated in the space between the pipe piece 51 and the diffuser 56, whereby the cooling water of the cooling water tank 1 is discharged from the space to the diffuser. The cooling water discharged from the circulation channel 3 and the cooling water in the cooling water tank 1 are discharged into the cooling water tank 1 from the outlet 55 through the body 54 after being sucked in a large amount into the inlet 53 of the cooling water tank 3. Thereby, a turbulent flow is generated in the cooling water in the cooling water tank 1, thereby preventing a deposit from being deposited in the cooling water tank 1.

FIG. 7 is an explanatory view showing a configuration of another example of the integrated gas-liquid mixer 20 A used in one embodiment of the present invention. A nozzle part 52 formed at an outlet part at the tip of the nozzle part, an inlet part 53 opened like a trumpet with the tip end of the nozzle part 52 facing the center in the extension direction of the nozzle part 52, and a trunk part 54; The diffuser 56 formed integrally with the outlet portion 55, and the pipe piece 51 and the diffuser 56 are integrally connected by a connecting arm 57 that protrudes integrally from a side surface of the pipe piece 51. Further, the right-handed right-handed blades 22 and the left-handed-handed left element blades 23 are alternately and integrally connected to the outlet portion 55 of the diffuser 56 between the rotating shafts at both ends. Mixing blades are combined.

The ozone gas from the ozone generator 10 is introduced from the inlet 53 of the diffuser 56 into the gas-liquid mixer 20 A thus configured, and the ozone gas from the circulating water channel 3 of the solid-liquid separator 40 is The open end is fitted to the pipe piece 51 and the return liquid of the solid-liquid separator is injected.

The clarified cooling water that has flowed into the pipe piece 51 from the open side of the circulating water channel 3 rushes from the narrowed nozzle portion 52 to the body portion 54 from the inlet portion 53 of the diffuser 56, and in the process. At the same time, a negative pressure naturally occurs in the space between the pipe piece 51 and the diffuser 56, whereby the ozone gas is introduced from the space into the inlet 53 of the diffuser 56. Thus, the clarified cooling water discharged from the circulation channel 3 and the ozone gas from the ozone generator 10 are ejected from the outlet 55 through the body 54.

The clarified cooling water and the ozone gas ejected from the outlet 55 are divided into two by the ejection pressure of the gas and liquid each time they pass through one element. The direction of rotation is reversed while the current flows from the central part to the peripheral part and from the peripheral part to the central part. In the process where these physical actions occur continuously, the phenomenon of turbulent stirring naturally occurs, and the injected gas and liquid are mixed uniformly, whereby the ozone gas is dissolved maximally in the clarified cooling water. The gas flows out from the outlet of the gas-liquid mixer 20A to the cooling water tank 1 as an ozone mixed liquid.

[0025]

[Effect of the invention]

 As is apparent from the above description, according to the purification device for suppressing the propagation of Legionella spp. In the cooling water in the cooling water circulation system such as the cooling tower according to the present invention, the cooling water is disposed inside or outside the cooling water tank. An ozone gas (negative ion) generator, a gas-liquid mixer that guides the ozone gas generated by the operation of the ozone generator into the cooling water of the cooling water tank through an air supply pipe, and an externally disposed cooling water tank. A circulating pump, a solid-liquid separator that absorbs water from the cooling water tank by the operation of the circulating pump, and separates and removes solids containing fine particles from the absorbed cooling water; and clear water that has passed through the solid-liquid separator. And a bifurcated parallel branch at the open side of the circulating water channel that discharges cooling water into the cooling water tank, and one of the pipes is discharged into the cooling water tank. And the gas-liquid mixer is connected to the other pipe so that the cooling water in the cooling water tank is turbulently stirred. The ozone gas is dissolved in the cooling water to the maximum, and the ozone gas is injected into the cooling water in the cooling water tank, effectively acting to kill Legionella spp.

Then, since the clarified reflux cooling water is jetted into the cooling water in the cooling water tank by the sedimentation preventing device, the cooling water in the cooling water tank is largely turbulently stirred. Has an extremely large effect of preventing the accumulation of slag.

As described above, the purification of the cooling water in the cooling water tank and the sterilization and elimination of the Legionella genus of the cooling water can be effectively and inexpensively performed by the organic synergistic effect of the physical means and the chemical means. it can.

Furthermore, the above-mentioned ozone gas is corrosive to certain metals, rubbers, and resins, and care must be taken when handling it. In particular, when ozone gas is blown into a liquid as in this apparatus, Generally, a fan is used, but it is difficult to find a suitable existing fan in consideration of corrosion in the market. However, when the return pressure of the circulating pump 30 for operating the solid-liquid separator 40 used in the embodiment of the present invention is guided to the pipe piece 51 of the sedimentation preventing device 50, it is generated at the trumpet-shaped inlet portion 53. By using the negative pressure, the ozone gas is blown into the liquid without using a fan, and can be effectively dissolved in the cooling water by passing through the mixing section having the mixing blade 21.

As described above, when the settling preventive device 50 and the integrated gas-liquid mixer 20A are used, the conventional gas diffuser which can immediately float to the surface of the water and cannot be mixed with the liquid is used. Unlike the permeable membrane means, which is expensive but has a small amount of treatment, it can contribute to the prevention of corrosion and the simplification of the equipment as well as the reduction of equipment costs.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is an explanatory view showing a part of a configuration of a mixing blade of an example of a gas-liquid mixer used in one embodiment of the present invention.

FIG. 3 is a schematic explanatory view showing an internal configuration of a solid-liquid separation device used in one embodiment of the present invention.

FIG. 4 is an external front view showing the structure of a settling preventer used in one embodiment of the present invention.

FIG. 5 is an external side view showing a configuration of a settling preventer used in one embodiment of the present invention.

FIG. 6 is an explanatory view showing the internal structure and operation of the sedimentation preventer used in the embodiment of the present invention.

FIG. 7 is an explanatory view showing a configuration of another example of the gas-liquid mixer used in one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cooling water tank 2 Air supply pipe 3 Circulating water channel 10 Ozone gas (negative ion) generator 11 Outlet 20 Gas-liquid mixer 20A Gas-liquid mixer 21 Mixing blade 22 Right element blade 23 Left element blade 30 Circulation pump 31 Outlet 40 Solid-liquid separator 41 Inlet 42 Separation tube 43 Inner wall 44 Solid 45 Lower guide blade mechanism 46 Vortex 47 Collection chamber 48 Drain 50 Precipitation preventer 51 Tube piece 52 Nozzle part 53 Inlet part 54 Body part 55 Outlet part 56 Diffuser 57 Connecting arm

[Procedure amendment]

[Submission date] June 6, 2000 (2000.6.6)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims for utility model registration

[Correction method] Change

[Correction contents]

[Utility model registration claims]

──────────────────────────────────────────────────続 き Continued on front page (51) Int.Cl. ⁷ Identification code FI C02F 1/78 C02F 1/78

Claims (5)

[Utility model registration claims] 1. An ozone gas (negative ion) generator 10 disposed inside or outside a cooling water tank 1, and an ozone gas generated by the operation of the ozone generator 10 is supplied to a cooling water of the cooling water tank 1 by an air pipe. A gas-liquid mixer 20 that guides the air flow through the cooling water tank 2, a circulation pump 30 disposed outside the cooling water tank 1, and the cooling water tank 1 that absorbs water from the cooling water tank 1 by operating the circulation pump 30. A solid-liquid separator 40 for separating and removing solids containing fine particles from water; a circulating water channel 3 for discharging clear water passing through the solid-liquid separator 40 to the cooling water tank 1; and discharging cooling water into the cooling water tank 1. A sedimentation preventing device 50 that bifurcates in parallel at the open side of the circulating water channel 3, discharges water into the cooling water tank 1 to one of the pipes, and turbulently flows the cooling water in the cooling water tank 1 to stir; Square pipes in the gas-liquid mixer 20 is Legionella breeding suppression purification system of the cooling water in the cooling water circulation system of the cooling tower or the like, characterized by comprising connected. 2. The gas-liquid mixer 20 includes a right element blade 22 having a right-handed twist between the rotation shafts at both ends.
The purification device for suppressing the propagation of Legionella spp. In a cooling water circulation system such as a cooling tower according to claim 1, wherein the left-handed left element blades 23 are alternately and integrally connected to each other. 3. The sedimentation preventing device 50 includes a pipe piece 51 fitted to one of the pipes on the open side of the circulating water channel 3 and a nozzle part 52 formed at an outlet at the tip thereof. In the extension direction, a trumpet-shaped inlet portion 53 with the tip of the nozzle portion 52 facing the center, and a body portion 54
And a diffuser 5 in which the outlet portion 55 is integrally formed.
6. The cooling system according to claim 1, wherein the pipe piece 51 and the diffuser 56 are integrally connected by a connection arm 57 that extends integrally from a side surface of the pipe piece 51. A purification device for controlling the propagation of Legionella spp. In water. 4. The gas-liquid mixer 20 has a pipe piece 51 and a nozzle 52 formed at an outlet at the tip thereof, and the tip of the nozzle 52 faces the center in the extension direction of the nozzle 52. A trumpet-shaped inlet 53 and a trunk 54
And a diffuser 5 in which the outlet portion 55 is integrally formed.
6, the pipe piece 51 and the diffuser 56 are integrally connected by a connecting arm 57 integrally extending from a side surface of the pipe piece 51, and further, with respect to an outlet portion 55 of the diffuser 56, 2. A cooling tower or the like according to claim 1, wherein a mixing blade formed by alternately and integrally connecting right element blades 22 with right-handed turns and left element blades 23 with left-handed turns is connected between the rotating shafts. A purification device for controlling the propagation of Legionella spp. In the cooling water in the cooling water circulation system. 5. The ozone gas generator 10, the gas-liquid mixer 20, the circulation pump 30, the solid-liquid separator 40.
And any one of the settling preventers 50 is provided in the cooling water tank 1
The purification device for controlling the propagation of Legionella bacteria in cooling water in a cooling water circulation system such as a cooling tower according to any one of claims 1 to 4, wherein a plurality of cooling devices are provided in accordance with the scale of the cooling water.