JPH0737389U - Biofouling prevention device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a biofouling prevention device which can make the ultraviolet irradiation device small in capacity and inexpensive in equipment cost and power cost. A biofouling prevention device comprising an ultraviolet irradiation device 4 installed in a recess 3 provided on a lateral wall 2 of a water channel, and an ultraviolet transparent cover 5 provided on an open surface of the recess 3 on the water side.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a biofouling prevention device, and more particularly, to a biofouling prevention device for preventing the adhesion of organisms to a lateral wall of a waterway.

[0002]

[Prior art]

 In a system that uses a large amount of seawater as cooling water, adherent organisms in seawater adhere to the walls of pipes, heat exchangers, pumps, etc., causing serious adhesion damage. Conventionally, the ultraviolet irradiation method has been adopted as a method for preventing the adhesion damage due to such adherent organisms.

[0003] The attachment of living organisms to the wall surface is caused by the organisms in the inflowing water, and if the inflowing organisms are irradiated with ultraviolet rays to paralyze their attachment ability, the organisms cannot attach to the wall surface. . As such a biofouling prevention device, Japanese Patent Application Laid-Open No. 3-224677 discloses that an ultraviolet irradiation device is provided over the entire cross section of a water channel.

[0004]

[Problems to be solved by the device]

 As in Japanese Patent Laid-Open No. 3-224677, in order to irradiate the entire cross-section of the water channel with ultraviolet rays, the ultraviolet ray irradiation device becomes large in size, and the facility cost is significantly increased, and the electricity cost and maintenance cost are also increased. Also bulky.

The present invention solves the above-mentioned conventional problems, and provides a biofouling prevention device that can significantly reduce the size of the ultraviolet irradiation device required and can reduce the equipment cost and the power cost. The purpose is.

[0006]

[Means for Solving the Problems]

 The biofouling prevention device of the present invention is characterized in that an ultraviolet irradiation device is installed in a recess provided in a lateral wall of a water channel, and an ultraviolet transparent cover is provided on an open surface of the recess on the water side. Is.

[0007]

[Action]

 In the biofouling prevention device of the present invention, an ultraviolet irradiation device is installed in the recess provided in the lateral wall of the waterway to irradiate the adherent organisms in the water flowing near the lateral wall of the waterway with ultraviolet rays, and its adhesion ability. Can be paralyzed.

As a result of various studies conducted by the present inventor, when the cross-sectional area of the water channel in which water flows is large and the flow velocity is small, the organisms existing in the center of the water channel are It was found that the wall surface could not be reached while it was flowing down.

That is, when the cross-sectional area of the canal is large and the flow velocity is small, it is possible to sufficiently prevent the adhesion of organisms to the lateral wall by irradiating only the water near the lateral wall of the upstream canal with ultraviolet rays. Was recognized.

According to the present invention, since the UV transparent cover is provided on the water-side open surface of the recess, the UV irradiation device is protected by this cover.

[0011]

【Example】

 Hereinafter, embodiments will be described with reference to the drawings. FIGS. 1 to 4 show an embodiment of the present invention. FIG. 1 is a sectional view of a water channel equipped with a biofouling prevention device, FIG. 2 is a horizontal sectional view thereof, and FIG. FIG. 4 is a vertical sectional view showing the irradiation device (a sectional view taken along line III-III in FIG. 4), and FIG. 4 is a sectional view taken along line IV-IV in FIG.

A recess 3 is provided in the lateral wall 2 of the seawater channel 1. An ultraviolet irradiation device 4 is provided in the recess 3. An ultraviolet-transparent cover 5 is provided on the open surface of the recess 3 on the water side. The ultraviolet-transparent cover 5 is made of quartz glass or a transparent resin sheet (for example, a fluororesin sheet).

In this embodiment, the recess 3 has a vertically long groove shape, and extends from a position slightly above the water surface of the water channel 1 to a position near the bottom surface of the water channel 1.

The ultraviolet irradiation device 4 is composed of an ultraviolet irradiation lamp. This lamp has a vertically long tubular shape, and a plurality of lamps are arranged in the recess 3.

In the organism adhesion prevention device configured as described above, when the cross-sectional area of the seawater channel 1 is large and the flow velocity is low, the organisms existing in the central portion of the seawater channel 1 are Since the water cannot reach the lateral wall 2 while flowing down the waterway 1 along the flow of seawater, adhesion of organisms to the lateral wall 2 is sufficiently prevented.

Hereinafter, the present invention will be described more specifically with reference to specific examples and comparative examples.

Example 1 The organism attachment preventing device shown in FIG. 1 was installed in a seawater canal, and the amount of organisms attached to the lateral wall of the canal was investigated. The channel has a width of 4 m and a depth of 4 m, and the seawater velocity is 0.31 m / s. Irradiation was carried out for 7704 hours at an ultraviolet irradiation dose of 17 mWSe / cm at a position 15 cm away from the lateral wall surface into water.

Comparative Example 1 In Example 1, under the same conditions as in Example 1 except that the ultraviolet irradiation lamp was turned off, the amount of organisms attached to the lateral wall downstream from the ultraviolet irradiation device was investigated.

As a result, the adhered amount of the organism in Example 1 was 41% in wet weight and 57% in the number of individuals as compared with the adhered amount of organism in Comparative Example 1. According to this, it was confirmed that the attachment of living organisms was effectively prevented.

[0020]

[Effect of device]

 As described above, the biofouling prevention device of the present invention irradiates water flowing in the vicinity of the lateral wall of the waterway with ultraviolet rays to prevent the adhesion of organisms to the lateral wall. However, the equipment cost and power cost of the biofouling prevention device can be reduced.

Further, the ultraviolet ray irradiating device can be protected by the ultraviolet ray permeable cover provided on the water side open surface of the concave portion.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a water channel equipped with an organism adhesion prevention device according to an embodiment.

FIG. 2 is a horizontal cross-sectional view showing an installed state of the organism adhesion preventing device of FIG.

FIG. 3 is a vertical sectional view showing an ultraviolet irradiation device (III-II in FIG. 4).
It is a sectional view taken along the line I).

FIG. 4 is a sectional view taken along line IV-IV in FIG.

[Explanation of symbols]

 1 Seawater canal 2 Horizontal wall 3 Recess 4 UV irradiation device 5 Cover

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazushi Kawabe 3-4-7 Nishishinjuku, Shinjuku-ku, Tokyo Kurita Industry Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A biofouling prevention device, wherein an ultraviolet irradiation device is installed in a concave portion provided on a lateral wall of a water channel, and an ultraviolet transparent cover is provided on an open surface of the concave portion on the water side.