JPH10244266A - Electric field treatment apparatus for liquid in piping - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the adhesion of scale in piping efficiently by a method in which fine particles in fluid flowing in piping are measured, the condition of scale adhesion is estimated and evaluated from a quantity corresponding to the concentration of the particles, the measured values are fed back, and electric field conditions are controlled to be optimum to prevent the adhesion of scale. SOLUTION: A compound is deposited from liquid in piping 2 by electric field treatment to be fine particles to prevent the adhesion of scale. An electric field treatment apparatus 1 is composed of an electric field generating means 3 for generating an electric field in piping 2, a fine particle measuring means 4 for measuring fine particles in liquid in the piping 2 downstream from the means 3, and a controlling means 5 for controlling the means 3 according to the output of the means 4. The fine particles in the liquid in the piping 2 are measured as absorbance by the means 4, and the relationship between the absorbance by the fine particles or the turbidity of the particles and electric field conditions by the means 5 to the means 3 to obtain the optimum electric field conditions.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scale adhering to a pipe, and more particularly to a scale adhering prevention device for preventing the adhering of a scale.

[0002]

2. Description of the Related Art Tap water and various liquids flow in water pipes and pipes installed in plants. The liquid flowing through the pipe contains compounds of various components in a dissolved state or a fine particle state. The compound that dissolves in the liquid becomes a scale when deposited on the inner wall surface of the pipe. When the amount of deposition of the scale increases, the inside diameter of the pipe is reduced, and the flow rate and the flow rate of the liquid flowing in the pipe are reduced, possibly affecting the treatment of the plant.

Conventionally, a method using an electric field has been known as a method for preventing scale from adhering to a pipe. Prevention of scale adhesion by this electric field treatment applies an electric field to the compound in the liquid flowing in the pipe by an electric field device,
The compound is precipitated to form crystallized fine particles, thereby preventing the compound from adhering to the inner wall of the pipe.

[0004]

The conventional electric field treatment for preventing the adhesion of scale has a problem that it is difficult to control the electric field condition to the optimum. Further, it is difficult to know the adhesion state of the scale in the pipe, and it is difficult to know the relationship between the electric field condition of the electric field treatment and the degree of prevention of the adhesion of the scale.

In the method for preventing adhesion of scale by electric field treatment for generating an electric field in a pipe, electric field strength and electric field frequency are conditions of the electric field generated in the pipe. It is necessary to set the electric field intensity and electric field frequency of this electric field treatment to optimal values in order to effectively prevent the adhesion of the scale. However, it takes a long time to know the relationship between the scale adhesion state and electric field conditions in the pipe and the degree of scale adhesion prevention, so it is difficult to determine whether the electric field conditions such as electric field strength and electric field frequency are optimal. It is.

Whether electric field conditions in electric field treatment are good or bad can be determined by disassembling the pipe after using it for several weeks or months depending on the set electric field condition, and inspecting the attached state of the scale attached to the pipe. However, it is necessary to repeat the above condition setting and determination to set the optimal electric field conditions.Controlling the electric field processing under the optimal electric field conditions takes into account the work content and the time until the optimal electric field conditions are obtained. Then it is not realistic and it is difficult to actually do it.

For this reason, electric field conditions are conventionally set by trial and error or empirical rules.

[0008] It is also possible to inspect the adhesion state of the scale in the piping by inserting a measuring probe into the piping or disconnecting the piping. However, it may affect the flow of liquid in the piping. It is difficult to arrange the measuring probe without giving it, and the work of connecting the pipes will affect the plant processing.

[0009] In general, various components such as purified water, wastewater, and liquids flowing in the manufacturing process are contained in flowing water, and electric field conditions for optimally performing electric field treatment are also defined by these compositions. May vary by component. Furthermore, electric field conditions for optimally performing electric field treatment may differ depending on flow conditions such as flowing water temperature, flow velocity, and flow rate.

In the conventional electric field treatment, the electric field condition is set to a constant electric field intensity and electric field frequency irrespective of the flow conditions such as the above-mentioned composition components, temperature, flow rate and flow rate. Therefore, the conventional electric field processing apparatus cannot control the electric field processing according to the flow of the fluid in the pipe, and cannot perform the optimal electric field processing.

Therefore, the present invention solves the above-mentioned problems of the conventional electric field treatment apparatus, and provides an electric field treatment apparatus capable of controlling the optimal electric field conditions for favorably preventing the adhesion of scale in the pipe. This is the purpose of 1.

[0012]

The electric field treatment apparatus according to the present invention measures fine particles contained in a fluid flowing in a pipe, estimates and evaluates the state of adhesion of scale from the equivalent amount of the fine particles, By feeding back the measured value, control is performed so that the electric field condition becomes an optimal condition for preventing the adhesion of the scale.

The present invention is an electric field processing device capable of controlling an optimal electric field condition, and the first configuration of the electric field processing device is as follows.
Electric field generating means for generating an electric field in the pipe, fine particle measuring means for measuring fine particles in the liquid in the pipe downstream of the electric field generating means, and control for controlling the electric field generating means based on the output of the fine particle measuring means Means for controlling the electric field condition so that the concentration of the fine particles in the liquid in the pipe is maximized.

According to the electric field processing apparatus of the first configuration,
An electric field is generated in the pipe by the electric field generating means, and the compound contained in the liquid flowing through the pipe is precipitated into fine particles by the electric field, and is prevented from adhering to the inner wall of the pipe, and provided downstream of the electric field generating means. The fine particles in the liquid in the pipe are measured by the fine particle measuring means, and the concentration equivalent of the fine particles in the liquid is measured. The concentration equivalent of the fine particles in the liquid corresponds to the amount of microcrystals precipitated by the electric field generating means. This shows that the effect of preventing the adhesion of the particles is high.

Therefore, by feeding back the measured value of the fine particle measuring means to the control means and controlling the electric field conditions of the electric field generating means so that the concentration of the fine particles in the liquid is maximized, the adhesion of the scale in the pipe is prevented. It is possible to control the electric field conditions optimally preventing the electric field.

In a second configuration of the electric field processing apparatus, the electric field condition is an electric field intensity, and the control means controls the electric field intensity generated by the electric field generating means. The electric field intensity of the electric field generating means is controlled such that the concentration of the fine particles in the liquid is maximized by controlling the electric field intensity of the liquid, and the optimal electric field intensity is controlled.

In a third configuration of the electric field processing device, the electric field condition is an electric field frequency, and the control means controls the electric field frequency generated by the electric field generating means, and controls the electric field frequency of the alternating electric field. Thus, the electric field intensity of the electric field generating means is controlled so that the concentration of the fine particles in the liquid is maximized, and the optimal electric field intensity is controlled.

Further, in a fourth configuration of the electric field processing apparatus, the electric field conditions are electric field intensity and electric field frequency, and the control means controls the electric field intensity and electric field frequency generated by the electric field generating means. By controlling the electric field intensity and the electric field frequency of the electric field, the electric field intensity of the electric field generating means is controlled so that the concentration of the fine particles in the liquid is maximized, and the optimal electric field intensity is controlled.

A fifth configuration of the electric field treatment apparatus comprises a fine particle measuring means for measuring fine particles of the liquid in the pipe, and an absorption intensity measuring means for measuring the absorption intensity of infrared light absorbed by the fine particles in the liquid. The control means optimally controls electric field conditions such as electric field intensity and electric field frequency based on the absorption intensity.

The absorption intensity measuring means utilizes the fact that the infrared spectrum is different depending on the composition of the fine particles. When the fine particles in the liquid are irradiated with light in the infrared region, the irradiated infrared region light is Absorption is observed at different characteristic wavelengths, and the absorption intensity is dependent on the concentration of the fine particles. Is measured.

Therefore, according to the absorption intensity measuring means, the composition of the fine particles can be known from the characteristic absorption wavelength of the infrared spectrum, and the concentration equivalent of the fine particles can be determined from the absorption intensity at the characteristic wavelength of the fine particles. You can ask.

By using the relationship between the concentration of fine particles of a known composition and the absorption intensity of infrared region light in the absorption intensity measuring means, the concentration of fine particles in flowing water can be determined from the measured absorption intensity.

In a sixth configuration of the electric field treatment apparatus, the fine particle measuring means for measuring the fine particles of the liquid in the pipe is constituted by measuring means for measuring the turbidity due to the fine particles in the liquid, and the control means comprises a light source. Based on absorbance or scattering intensity,
This is to optimally control electric field conditions such as electric field strength and electric field frequency.

[0024]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic block diagram for explaining an electric field treatment apparatus for liquid in a pipe and a method for evaluating adhesion of scale in a pipe according to the present invention. In FIG. 1, an electric field treatment device 1 is a device for preventing scale from adhering in a pipe 2, and a liquid in the pipe 2 contains a compound that causes scale. This compound
The compound is contained in a liquid state in the form of fine particles or in a dissolved state, and the dissolved compound adheres to the inner wall surface of the pipe 2 to form a scale. No adhesion occurs and no scale is formed.

Therefore, by depositing the compound contained in the liquid in the pipe by the electric field treatment to form fine particles, it is possible to prevent the adhesion of scale.

The electric field processing apparatus 1 comprises an electric field generating means 3 for generating an electric field in the pipe 2 with respect to the pipe 2, and a fine particle measuring means for measuring fine particles in the liquid in the pipe 2 on the downstream side of the electric field generating means 3. 4 and a control means 5 for controlling the electric field generating means 3 based on the output of the fine particle measuring means 4.
In FIG. 1, the control means 5 is a power source 6 of the electric field generation means 3.
Is shown.

The electric field generating means 3 applies a DC electric field or an AC electric field to the compound in the liquid in the pipe 2.
The electric field precipitates microcrystals of the compound that serve as scales. The precipitated microcrystals flow as fine particles in the liquid, and hardly adhere to the inner wall of the pipe. The electric field generating means utilizes the deposition characteristics of the compound due to the electric field, thereby preventing the scale from adhering.

When the electric field generating means 3 generates a DC electric field, the control means 5 controls the electric field strength of the DC electric field, and when the electric field generating means 3 generates an AC electric field, the electric field strength and the electric field frequency of the AC electric field are controlled. Alternatively, for both the electric field strength and the electric field frequency, the electric field conditions are controlled so that the concentration of the fine particles in the liquid in the pipe is maximized.

By controlling the strength conditions so that the concentration of the fine particles in the liquid in the pipe is maximized, the proportion of the dissolved compound causing scale in the liquid in the pipe is reduced, and Prevents adhesion.

In FIG. 1, the fine particle measuring means 4 can measure the fine particles contained in the liquid in the pipe as the absorbance. The fine particle measuring means 4 utilizes the fact that the infrared spectrum differs depending on the composition of the fine particles. When the fine particles in the liquid are irradiated with light in the infrared region, the irradiated infrared region light is Absorption is observed at characteristic different wavelengths, and the absorption intensity is dependent on the concentration of the fine particles. Using the absorption intensity at a wavelength unique to each composition, the value corresponding to the concentration of the fine particles is measured. can do.

Therefore, according to the fine particle measuring means 4, the composition of the fine particles can be known from the characteristic absorption wavelength of the infrared spectrum, and the concentration equivalent of the fine particles can be determined from the absorption intensity at the characteristic wavelength of the fine particles. You can ask. Further, when measuring the particles, the fine particle measuring means 4 can measure the concentration equivalent of the particles remaining in the pipe as turbidity.

Referring to FIG. 2, a method for obtaining an optimal electric field condition by using the relationship between the absorbance or the turbidity of the particles in the liquid and the electric field condition in the electric field generating means will be described. FIG. 2A shows a case where the electric field strength is controlled as the electric field condition. When the electric field strength is increased (arrow A in the figure) or decreased (arrow B in the figure), the maximum or maximum absorbance C is obtained when the optimum electric field strength exists within the change in the electric field strength, The electric field strength at this time becomes the optimum electric field strength. Therefore, the optimum electric field strength can be obtained by obtaining the maximum or maximum absorbance while changing the electric field strength.

FIG. 2B shows the case where the electric field frequency is controlled as the electric field condition. When the electric field frequency is increased (arrow a in the figure) or decreased (arrow b in the figure), the maximum or maximum absorbance c is obtained when the optimum electric field frequency is within the change of the electric field frequency, The electric field frequency at this time is the optimum electric field frequency. Therefore, the optimum electric field frequency can be obtained by obtaining the maximum or maximum absorbance or turbidity while changing the electric field frequency.

Next, the control procedure of the electric field condition will be described with reference to the flow charts of FIGS. 3 and 4 and the relationship between the electric field condition and the absorbance of FIG. FIG. 3 is a flowchart when the electric field generating means generates a DC electric field, and FIG. 4 is a flowchart when the electric field generating means generates an AC electric field.

First, a measurement wavelength for measuring the absorbance of the fine particles is set in the fine particle measuring means 4 of the electric field treatment device 1. The wavelength at which light is absorbed varies depending on the composition of the fine particles. Therefore, a wavelength at which good absorption is obtained for the composition of the compound contained in the liquid flowing in the pipe is determined in advance. Then, a wavelength corresponding to the compound for preventing the adhesion of the scale is selected from the determined wavelengths and set in the fine particle measuring means 4 (Step S).
1).

The absorbance is measured at the set measurement wavelength by the fine particle measuring means 4, the measured value is set as an initial value (step S2), and zero calibration of the absorbance is performed using the initial value. S3 in FIG. 6 indicates this zero calibration (step S3).

Next, initial values are set for the electric field intensity of the DC electric field of the electric field generating means 3 or the electric field intensity and the electric field frequency of the AC electric field. S4 in FIG. 6 indicates the initial setting of the electric field strength (step S4). Measure the absorbance at the set electric field strength. S5 in FIG. 6 indicates this absorbance (step S5).

Thereafter, the change in the absorbance with respect to the change in the electric field strength of the DC electric field is measured, and the electric field strength is controlled so that the absorbance is maximum or maximum, whereby the DC electric field strength can be controlled ( Step S10),
Further, by measuring the change in the absorbance with respect to the change in the electric field strength and the frequency of the AC electric field, and controlling the electric field strength and the frequency so that the absorbance is maximum or maximum, the AC electric field strength can be controlled ( Step S20, Step S30).

The control of the DC electric field intensity, the control of the AC electric field intensity, and the frequency control of the AC electric field will now be described with reference to FIGS.
This will be described with reference to FIGS.

FIG. 5 is a flowchart for explaining the control of the DC electric field intensity. The control of the DC electric field strength is shown in FIG.
After S5 shown in (1), the electric field strength is increased. An arrow S11 in FIG. 6 indicates a change in absorbance due to the increase in the electric field intensity (step S11). At this time, it is determined whether or not the electric field intensity generated by the electric field generating means is within the maximum electric field intensity allowed by the device, and the magnitude of the electric field intensity is limited so as to be within the maximum electric field intensity (step S12). The absorbance at the increased electric field strength is measured. S13 in FIG. 6 indicates this absorbance (step S13).

It is determined whether the measured absorbance has increased (step S14), and steps S11 to S14 are repeated until the absorbance no longer increases.

After the increase in the absorbance due to the increase in the electric field strength is stopped, the same operation is performed by decreasing the electric field strength. An arrow S15 in FIG. 6 indicates a change in absorbance due to the decrease in the electric field intensity (step S15). At this time, it is determined whether or not the electric field intensity generated by the electric field generating means is within the minimum electric field intensity permitted by the device, and the magnitude of the electric field intensity is limited so as to be within the minimum electric field intensity (step S1).
6). The absorbance at the decreased electric field intensity is measured (step S17).

It is determined whether the measured absorbance has increased (step S18), and steps S15 to S18 are repeated until the absorbance no longer increases.

By the above-mentioned process, the electric field intensity at which the absorbance is maximum or maximum can be obtained, and the obtained electric field intensity is the optimum electric field intensity for preventing the scale from adhering.

In this state, after waiting for a predetermined time, an electric field process for preventing scale adhesion by the electric field generating means is performed. After the elapse of a predetermined time, the steps S11 to S19 are repeated again. Thereby, it is possible to control the optimal electric field condition corresponding to the condition change in the pipe.

7 and 8 are flow charts for explaining the control of the electric field condition of the AC electric field, and FIG. 7 is a flow chart for controlling the intensity of the AC electric field.
FIG. 8 is a flowchart for controlling the frequency of the AC electric field.

The flowcharts of FIGS. 7 and 8 are different from the flowchart of FIG. 5 in that an AC electric field intensity and an AC electric field frequency are controlled instead of the DC electric field intensity in the flowchart of FIG. Therefore, the description of the flowcharts of FIGS. 7 and 8 is omitted here.

According to the embodiment of the present invention, the control of the optimum electric field intensity of the DC electric field generated by the electric field generating means can be automatically and promptly performed according to the state of the liquid flowing in the pipe. However, an optimal electric field condition is obtained by repeating the control of the electric field strength and the electric field frequency.

The same control can be performed also when the measurement of light absorbance or scattering intensity as turbidity is used as the measuring means.

According to the embodiment of the present invention, the control of the optimum electric field intensity and the alternating electric field frequency of the alternating electric field generated by the electric field generating means can be automatically and promptly performed according to the state of the liquid flowing in the pipe. it can.

According to the embodiment of the present invention, it is possible to evaluate the prevention of scale adhesion by the electric field generating means based on the absorption intensity or the scattering intensity.

[0052]

As described above, according to the electric field treatment apparatus for liquid in a pipe of the present invention, it is possible to control the optimal electric field conditions for preventing the adhesion of scale in the pipe in a favorable manner. According to the method for evaluating the adhesion of scale in a pipe according to the present invention, the state of adhesion of scale attached to the pipe is estimated,
Evaluation of scale adhesion prevention can be performed.

[Brief description of the drawings]

FIG. 1 is a schematic block diagram for explaining an electric field treatment apparatus for liquid in a pipe and a method for evaluating adhesion of scale in a pipe according to the present invention.

FIG. 2 is a diagram for explaining a method for obtaining an optimum electric field condition by the electric field treatment apparatus for liquid in a pipe according to the present invention.

FIG. 3 is a flowchart for explaining a control procedure of electric field conditions when the electric field generating means of the present invention generates a DC electric field.

FIG. 4 is a flowchart for explaining a control procedure of electric field conditions when the electric field generating means of the present invention generates an AC electric field.

FIG. 5 is a flowchart illustrating control of the DC electric field intensity according to the present invention.

FIG. 6 is a diagram showing the relationship between electric field conditions and absorbance.

FIG. 7 is a flowchart for controlling the intensity of an AC electric field according to the present invention.

FIG. 8 is a flowchart for controlling the frequency of an AC electric field according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric field processing apparatus 2 Piping 3 Electric field generating means 4 Particle measuring means 5 Control means 6 Power supply

Claims (6)

[Claims] An electric field generating means for generating an electric field in the pipe; a fine particle measuring means for measuring fine particles in a liquid in the pipe downstream of the electric field generating means; and an electric field based on an output of the fine particle measuring means. Control means for controlling the generation means, wherein the control means controls the electric field conditions so that the concentration of the fine particles in the liquid in the pipe is maximized. 2. The electric field treatment apparatus for liquid in a pipe according to claim 1, wherein the electric field condition is an electric field intensity, and the control means controls the electric field intensity generated by the electric field generating means. 3. The electric field processing apparatus for liquid in a pipe according to claim 1, wherein said electric field condition is an electric field frequency, and said control means controls an electric field frequency generated by said electric field generating means. 4. The liquid in a pipe according to claim 1, wherein the electric field condition is an electric field intensity and an electric field frequency, and the electric field condition controlling means controls the electric field intensity and the electric field frequency generated by the electric field generating means. Electric field treatment equipment. 5. The method according to claim 1, wherein the fine particle measuring means includes an absorption intensity measuring means for measuring an absorption intensity of an infrared light absorbed by the fine particles in the liquid, and the control means performs control based on the absorption intensity. 4. The method according to claim 1, wherein:
Or the electric field treatment device for liquid in a pipe according to 4. 6. The apparatus according to claim 1, wherein said fine particle measuring means includes a measuring means for measuring turbidity due to fine particles in a liquid, and said control means performs control based on absorbance or scattering intensity. 5. The electric field treatment device for liquid in a pipe according to claim 3, 3 or 4.