JPH09236546A - Slime-detecting apparatus and slime-preventing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect the amount of slime adhering to a transparent plate based on the amount of light emitted from a light-emitting part, penetrating the transparent plate and detected at a photodetecting part, and control a medicine injection pump for a slime controller, by setting the light-emitting part, transparent plate and photodetecting part in a water system. SOLUTION: A light penetrating a transparent plate 1 among lights emitted from a light-emitting part 2 to the transparent plate 1 is detected by a photodetecting part 3. Driving of a medicine injection pump P is controlled by a controller 4 based on the amount of the penetrating detected light. The light-emitting part 2 and photodetecting part 3 are connected to optical fibers 10A, 10B and therefore, a light by a light-emitting means in the controller 4 is transmitted through the fiber 10A to the light-emitting part 2. The light detected at the photodetecting part 3 is operated through the fiber 10B at a light amount-operating means installed in the controller 4 and consisting of a photoelectric converter, an amplifier and a means for comparing an amplification signal value with a set value, etc. The result is output, displayed at a display or the like and also transmitted as an activation signal to a timer T and the medicine injection pump P.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slime detection device and a slime prevention device, and more particularly to a slime detection device for automatically detecting on-site slime generated in various water systems such as a cooling water system and a papermaking water system. The present invention relates to a slime prevention device that automatically controls the addition amount of a slime prevention agent based on a signal from this slime detection device.

[0002]

2. Description of the Related Art In the cooling water system of various factory plants, slime composed of bacteria, filamentous fungi, algae, etc. in the water is generated in the system, which lowers the thermal efficiency, blocks the water piping, corrodes the metal material of the piping, etc. Slime disorders occur. Also, slime disorders cause serious problems in other water systems such as paper pulp process water systems, cooling water systems, and wastewater treatment water systems.

Conventionally, as a countermeasure against slime in these water systems, a method of examining the presence or absence of slime and adding a slime inhibitor to the water system when slime is generated has been adopted.

Conventionally, as a method for detecting water-based slime,
There is a method in which the transparent plate is immersed in an aqueous system for 2 to 3 days and then pulled up, the slime adhering to the transparent plate is dyed, and the absorbance is measured using a photoelectric colorimeter (Japanese Patent Publication No. Sho 5).
3-19951).

[0005]

However, in the above-mentioned conventional slime detection method, it is necessary to pull up the transparent plate from the water system and perform dyeing and absorbance measurement in the laboratory, which requires a great deal of time and labor for detecting slime. In other words, there is a drawback that the slime detection cannot be performed quickly on site.

Furthermore, when the occurrence of slime is detected,
Since the antislime agent is added manually, the addition of the antislime agent also requires a lot of work. Further, since it takes time from the detection of slime to the addition of the slime inhibitor, there is a problem that the slime trouble progresses during this time.

The present invention solves the above-mentioned conventional problems and provides a slime detector capable of easily and quickly detecting an aqueous slime on site, and a slime preventive agent using such a slime detector. It is an object of the present invention to provide a slime prevention device that automatically controls chemical injection.

[0008]

A slime detection device according to a first aspect of the present invention is a transparent plate immersed in a water system, a light emitting portion arranged on one side of the transparent plate, and the other side of the transparent plate. It is characterized by comprising a light receiving portion arranged on the side, and a measuring means for measuring the amount of light emitted from the light emitting portion, transmitted through the transparent plate, and received by the light receiving portion.

According to another aspect of the slime detection device of the present invention, the reflector is immersed in the water system, the light emitting portion and the light receiving portion are disposed on one side of the reflector, and the reflector emits light from the light emitting portion. And a means for measuring the amount of light reflected and received by the light receiving unit.

The slime prevention device of the present invention comprises a chemical injection means for adding a slime inhibitor to a water system and a control device for the chemical injection means. It is characterized in that it is provided with a slime detection device of No. 2 and controls the drug injection means based on a signal from the detection device.

When slime adheres to the transparent plate or the reflection plate, the amount of light transmitted through the transparent plate or the amount of light reflected by the reflection plate is reduced depending on the amount of adhesion. Therefore, the amount of slime attached to the transparent plate or the reflective plate, that is, the amount of slime in the water system can be obtained based on the amount of transmitted light or the amount of reflected light.

Since the amount of transmitted light or the amount of reflected light is measured while the transparent plate or the reflective plate is immersed in the water system, the slime detecting device of the present invention allows the slime to be easily and quickly on-site. Can be detected.

According to the slime prevention device of the present invention which controls the chemical injection based on the detection signal of the slime detection device of the present invention, an appropriate amount of the slime prevention agent is automatically added immediately after the slime is detected. You can

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a slime detection device and a slime prevention device of the present invention will be described below with reference to the drawings.

FIG. 1 is a system diagram showing an embodiment of a slime detection device and a slime prevention device using the slime detection device according to claim 1 of the present invention.

A transparent plate 1, a light emitting portion 2 arranged on one side of the transparent plate 1 and a light receiving portion (optical sensor) 3 arranged on the other side are arranged in the water system. Of the light emitted from the light emitting unit 2 toward the transparent plate 1, the light transmitted through the transparent plate 1 is received by the light receiving unit 3, and based on the amount of transmitted light received, the controller 4 controls the dose of the chemical injection pump P. The light emitting unit 2 and the light receiving unit 3 that control the operation are connected to the optical fibers 10A and 10B, and the light from the light emitting means provided in the controller 4 is transmitted to the light emitting unit 2 by the optical fiber 10A. Then, the light received by the light receiving unit 3 is calculated by the light amount calculation means including the photoelectric converter provided in the controller 4 by the optical fiber 10B, the amplifier, and the means for comparing the amplified signal value with the set value. Is output. The calculation result is output and displayed as a warning on a buzzer, a lamp, or a display, and a pump start signal is transmitted to the timer T and the chemical injection pump P.

When slime adheres to the surface of the transparent plate 1,
Since the transparency of the transparent plate 1 is reduced, the amount of transmitted light is reduced. Therefore, this transmitted light amount measured by the light receiving unit 3 is
When the value becomes smaller than a preset value, slime adhesion is detected, and the chemical injection pump P is operated for a predetermined time by the timer T to quantify the slime inhibitor in the tank 5 from the chemical injection pipe 6 to the water system. Added. A plurality of transparent plates can be installed depending on the slime amount.

FIG. 2 is a system diagram showing an embodiment of a slime detection device and a slime prevention device using this slime detection device according to a second aspect of the present invention.

In this embodiment, the reflector 7 is provided in the water system, and the light emitting section 2 and the light receiving section 3 arranged on one side of the reflector 7.
And are arranged. Of the light emitted from the light emitting unit 2 toward the reflecting plate 7, the light reflected by the reflecting plate 7 is received by the light receiving unit 3
The controller 4 controls the operation of the chemical injection pump P based on the amount of reflected light received.

When slime adheres to the surface of the reflector 1,
Since the reflectance of the reflector 1 is reduced, the amount of reflected light is reduced. Therefore, this reflected light amount measured by the light receiving unit 3 is
When the value becomes smaller than a preset value, slime adhesion is detected, and the chemical injection pump P is operated for a predetermined time by the timer T to quantify the slime inhibitor in the tank 5 from the chemical injection pipe 6 to the water system. Added.

The chemical injection control by the controller 4 is performed by a timer T in which a pump P having a constant discharge speed is operated for a predetermined time to add a certain amount of a slime preventive agent. A method such as opening and closing can be adopted.

In the present invention, the slime inhibitor is not particularly limited, and an inorganic or organic chlorine-based slime control agent or the like can be used.

A glass plate or an acrylic resin plate can be used as the transparent plate. Further, as the reflecting plate, a transparent plate on which a reflecting film is formed, such as a mirror, can be used.

The location of such a transparent plate or reflector is not particularly limited as long as it is not exposed to direct sunlight or light that causes a measurement error in the amount of transmitted light or reflected light. Generally, the transparent plate or the reflective plate is immersed and placed in a water tank of a water system such as a circulating water tank provided with a light-shielding means or the like as necessary, but may be provided at other places.

By the way, in the present invention, when the transparent plate or the reflecting plate is immersed in a water tank or the like, it is fixed at a predetermined position with respect to the light emitting portion and the light receiving portion without being flowed by a water stream, and It is necessary to place the slime stably so that it does not come into contact with the wall or bottom of the aquarium and the external surface of the slime is affected.

Therefore, it is preferable that the transparent plate or the reflective plate is fixed to a support as shown in FIG. 3 and stably immersed in the water system. The support base 11 shown in FIG. 3 is configured such that the transparent plate 1 is supported by a case 12 made of a transparent material having an open top. That is, the side wall 12A of the case 12
Of the 12D, the inner surfaces of the side walls 12A, 12B are provided with grooves 13A, 13B in which the transparent plate 1 can slide, and the side edges of the transparent plate 1 can be slid into and removed from the grooves 13A, 13B. It is configured to be able to.
Further, the side wall 12C of the case 12 is provided with the light emitting section 2 (in the present embodiment, four light emitting sections 2A, 2B, 2C and 2D are provided), and the side wall 12D is provided with the light receiving section 3.
(In this embodiment, four light receiving portions 3A, 3B, 3C, 3D are provided.) Are attached, and the light emitting portions 2A to 2D and the light receiving portions 3A to 3D are respectively connected by the optical fibers 10A and 10B. It is connected to the controller 4 described above.

By using the support 11 as described above, the light emitting section 2, the transparent plate 1 and the light receiving section 3 are provided in the water tank.
Can be easily and stably fixed. In addition, when it is necessary to block direct sunlight when fixing the transparent plate using the support base 11, the case 12 of the support base 11 is used.
A light shield plate may be attached to the upper open portion of the.

When the reflection plate is fixed by such a support, one side wall of the case 12 (for example, the side wall 12C).
A light emitting portion and a light receiving portion may be provided in the.

By using the optical fibers 10A and 10B, it is sufficient if the light emitting portion and the light receiving portion are simply the light emitting end and the light receiving end, and it is not necessary to immerse the light emitting element and the light receiving element in water. It is extremely advantageous in terms of water resistance.

[0030]

As described above in detail, according to the slime detecting device of the present invention, the water-based slime can be detected quickly and accurately on the spot by the detecting device having a simple structure. Further, according to the slime prevention device of the present invention, by using such a slime detection device of the present invention, an appropriate amount of anti-slime agent is added to the water system immediately after the detection of slime by automatic control without requiring labor. As a result, it is possible to reliably prevent the slime failure of the water system.

[Brief description of drawings]

FIG. 1 is a system diagram showing an embodiment of a slime detection device according to claim 1 and a slime prevention device using the slime detection device.

FIG. 2 is a system diagram showing an embodiment of the slime detection device of claim 2 and a slime prevention device using the slime detection device.

FIG. 3 is a perspective view showing a support base of a transparent plate suitable for the present invention.

[Explanation of symbols]

 1 Transparent plate 2, 2A, 2B, 2C, 2D Light emitting part 3, 3A, 3B, 3C, 3D light receiving part 4 Controller 5 Tank 7 Reflector 10A, 10B Optical fiber 11 Support stand 12 Case

Claims (4)

[Claims] 1. A transparent plate immersed in a water system, a light-emitting part arranged on one side of the transparent plate, a light-receiving part arranged on the other side of the transparent plate, and A slime detection device comprising: a means for measuring the amount of light emitted, transmitted through the transparent plate, and received by the light receiving section. 2. A reflecting plate immersed in a water system, a light emitting part and a light receiving part arranged on one side of the reflecting plate, and a light emitting part which emits from the light emitting part and is reflected by the reflecting plate. A slime detection device comprising a means for measuring the amount of light received by. 3. The light emitting means and the received light amount measuring means according to claim 1 or 2, wherein the light emitting means and the received light amount measuring means are arranged outside the water system, and the light from the light emitting means is guided into the water system by an optical fiber cable to emit light from the water system. A slime detection device characterized in that it is guided to said received light quantity measuring means by an optical fiber gable. 4. A slime prevention apparatus comprising a chemical injection means for adding an anti-slime agent to an aqueous system and a controller for the chemical injection means, wherein the control apparatus is defined in any one of claims 1 to 3. A slime prevention device, comprising: the slime detection device described above; and controlling the chemical injection means based on a signal from the detection device.