JP3757888B2 - Operation management method for water treatment equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to the operation management method of water treatment equipment, in particular to the operation management how water treatment equipment for scale or slime preventing cooling water system.
[0002]
[Prior art]
In the cooling water system, slime is easily generated by microorganisms. In particular, in the high concentration operation of the circulating cooling water system, the quality of the cooling water deteriorates, and it becomes easy to generate slime that is formed by mixing soil, dust, etc. with microorganisms such as bacteria, cocoons and algae. Cause deterioration of heat efficiency and water flow. In addition, local corrosion of equipment and piping is induced in the slime adhesion part.
[0003]
In order to prevent such damage caused by slime, a method in which chloride ions contained in cooling water are converted into a chlorine-based oxidizing agent such as hypochlorous acid by electrolytic oxidation, and this chlorine-based oxidizing agent is present in the cooling water. Has also been done.
[0004]
That is, the tap water or industrial water used as make-up water for the cooling water system, usually several ^{mg-Cl - / L~10mg-Cl} - / L of about from that it contains chloride ions, the circulating cooling water system In the cooling water, chloride ions in the makeup water are concentrated by a 6-8 times high concentration operation. For this reason, by subjecting this cooling water to electrolytic treatment, residual chlorine (free chlorine) having a slime prevention effect can be generated from chloride ions in the cooling water. By returning the electrolytically treated water containing residual chlorine to the cooling water system, slime failure can be prevented.
[0005]
In this electrolytic treatment apparatus for generating a chlorinated oxidant, a DC voltage is applied between an anode and a cathode using an external power source, and cooling water is passed between both electrodes. As a result, chloride ions in the cooling water are oxidized on the surface of the anode, and residual chlorine having strong oxidizing power such as hypochlorous acid is generated. The generated residual chlorine sterilizes microorganisms that cause slime, or suppresses growth, so that generation of slime in the circulating cooling water system can be effectively prevented.
[0006]
In an open circulation cooling water system, the concentration of salts in the makeup water increases due to the circulation and use of water, and scale components such as calcium carbonate and silica adhere to the tubes of the heat exchanger. Causes heat transfer inhibition.
[0007]
As this scale prevention technique, there is a method in which a pair of electrodes of different metals are used and a current is generated between the electrodes to elute metal ions having a scale prevention effect into an aqueous system. For example, since aluminum ions suppress the precipitation of calcium carbonate, stainless steel and aluminum, or carbon and aluminum are used in combination with the cathode and anode, and the aluminum ions are dissolved from the aluminum electrode in the circulating water to heat the calcium carbonate in the heat exchanger. Techniques for reducing scale adhesion are known.
[0008]
[Problems to be solved by the invention]
In the cooling water system, in order to reliably prevent slime failure, residual chlorine and electric conductivity in the cooling water are measured to control energization of the electrolytic treatment apparatus. In addition, in order to reliably prevent scale failure, control is performed so that the value of the current applied to the metal ion elution electrode is within a predetermined range.
[0009]
The present invention detects whether the operation of the water treatment equipment for preventing such slime failure, scale failure, etc. is properly performed, and automatically restores the function as necessary and automatically dispatches service personnel. An object of the present invention is to provide an operation management method for a water treatment apparatus that can be performed automatically.
[0010]
[Means for Solving the Problems]
The operation management method for a water treatment device according to the present invention provides an operation state detection device for detecting an operation state of the water treatment device and a function of the water treatment device in a water treatment device for cooling water system scale or slime prevention. Provided is a function recovery device that recovers by cleaning , and is an operation management method for a water treatment device that operates the function recovery device based on a detection result of the operation state detection device, and functions even if the function recovery device is operated. A repair request signal is generated when recovery is not possible.
[0011]
According to the operation management method for water treatment equipment, when the operation state of the water treatment equipment is out of the specified range, function recovery operation such as electrode cleaning is automatically performed . Be carried out this function recovery operation, function has not sufficiently recovered if, it is possible to arrange automatically as for example to dispatch a service engineer.
[0012]
In the present invention, it is preferable that the detection signal of the detection device is transmitted to the remote monitoring device via a communication line, and the repair request signal is generated from the remote monitoring device. In this way, it is possible to centrally manage the water treatment equipment installed in various parts of the country, and perform dispatch management of service personnel in a unified manner. In addition, abnormal data can be centrally managed and stored, which can be used to improve water treatment equipment.
[0013]
The present invention, that apply to the operation management of the water treatment equipment cooling water system. Since many cooling water systems are installed in various places in the country, the effect when the present invention is applied is great.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0015]
FIG. 1 is a system diagram of an open circulation cooling water system showing an embodiment of the present invention.
[0016]
In this open circulation cooling water system, the cooling water is supplied from the cooling tower 1 to the heat exchanger 3 through the circulation pipe 2 having the pump P ₁ , and the return water is returned to the cooling tower 1 through the pipe 4. 5 is a supply water introduction pipe, and 6 is a blow pipe.
[0017]
In the embodiment of FIG. 1, a metal ion generator 7 is provided in the circulation pipe 2 from the cooling tower 1 to the heat exchanger 3 to elute metal ions into the circulating cooling water.
[0018]
The metal ion generator 7 has a configuration in which electrodes are provided in an electrolytic cell through which circulating cooling water flows, and a current generator that applies a DC voltage is provided between the electrodes.
[0019]
As the metal ions to be eluted, aluminum ions, iron ions and zinc ions are particularly preferable, and these may be used alone or in combination of two or more. Accordingly, aluminum, iron, zinc or the like is preferably used as the electrode material.
[0020]
The elution concentration of metal ions to be eluted in the circulating cooling water system is not particularly limited, but it is preferable to elute continuously so as to be 0.01 ppb to 1 ppm, particularly 0.1 to 10 ppb with respect to the target water system. If this elution concentration is less than 0.01 ppb, sufficient scale adhesion preventing effect cannot be obtained, and if it exceeds 1 ppm, adhesion of metal salt may occur.
[0021]
Three-way valves 10 and 11 are arranged before and after the metal ion generator 7, and a bypass pipe 12 that bypasses the metal ion generator 7 is connected to the three-way valves 10 and 11. Further, branch pipes 13 and 14 branch from the pipe between the three-way valves 10 and 11 and the metal ion generator 7, and the branch pipes 13 and 14 are connected to the cleaning unit 15. The cleaning unit 15 is for cleaning the electrodes of the metal ion generator 7, and has a tank for storing the cleaning liquid and a pump for circulating and supplying the cleaning liquid in the tank to the metal ion generator 7. I have. As this cleaning solution, a hydrogen peroxide chemical, a hydrochloric acid chemical, a chelate chemical, an organic slime control agent, or the like is used.
[0022]
The metal ion generator 7 is provided with an electromotive force meter for measuring an electromotive force of an electrode in contact with water. When the scale adheres to the electrode of the metal ion generator 7, the electromotive force of the electrode decreases, so that the cleaning unit 15 is operated when the electromotive force falls below a predetermined range.
[0023]
The steady state of the cooling tower operation, the three-way valve 10 communicates with a pump P ₁ and the metal ion generator 7, although the three-way valve 11 has a flow path selection for communication with the metal ion generating device 7 and the heat exchanger 3, At the time of cleaning, the three-way valves 10 and 11 are switched so that the water from the pump P ₁ is supplied to the heat exchanger 3 through the bypass pipe 12. In this state, the cleaning unit 15 operates, and the cleaning liquid is circulated from the cleaning unit 15 to the metal ion generator 7.
[0024]
The cooling tower 1 is provided with an electrical conductivity meter 20 for detecting the electrical conductivity of the cooling water, and the detected value of the electrical conductivity meter 20 is input to the concentration management device 21, The valve 5a of the makeup water pipe 5 and the valve 6a of the blow pipe 6 are controlled so that the electric conductivity falls within the specified range.
[0025]
The water in the cooling tower 1, a pipe 31 having a pump _{P 2,} filtration unit 32, the three-way valve 33, the electrolytic processing apparatus 34, is circulated through the three-way valve 35. As the filtration device 32, an upward flow filtration device, a sand filtration device, a filter filtration device, or the like is used. The electrolytic treatment apparatus 34 has a pair of electrodes arranged in an electrolytic cell, and applies a voltage to the electrodes to generate a chlorine-based oxidant from chloride ions in water.
[0026]
The cooling tower 1 is provided with an ORP meter 30 for measuring the ORP (oxidation-reduction potential) of the cooling water, and the electrolytic treatment apparatus 34 is configured so that the detected ORP of the ORP meter 30 falls within a predetermined range. The applied voltage between the electrodes is controlled.
[0027]
A bypass pipe 36 that bypasses the electrolytic treatment device 34 is installed between the three-way valves 33 and 35.
[0028]
Further, branch pipes 37 and 38 branch from between the three-way valve 33 and the electrolytic treatment apparatus 34 and between the three-way valve 35 and the electrolytic treatment apparatus 34, respectively. Are connected to a cleaning unit 39 for electrode cleaning. The cleaning unit 39 includes a tank for storing the cleaning liquid and a pump for circulatingly supplying the cleaning liquid in the tank to the electrolytic treatment apparatus 34.
[0029]
As this cleaning solution, dilute hydrochloric acid, dilute sulfuric acid, chelating chemicals and the like are used.
[0030]
The electrolytic treatment apparatus 34 is provided with a voltage measurement system for measuring the electrolytic voltage, and is configured to operate the cleaning unit 39 when the ratio of the actual electrolytic voltage and the theoretical electrolytic voltage exceeds a predetermined range. ing. That is, when scale or slime adheres to the electrodes of the electrolytic processing apparatus 34, the voltage applied between the electrodes rises in order to flow a predetermined current, and therefore when the ratio of the applied voltage and the theoretical applied voltage becomes a predetermined value or more. Clean the electrode.
[0031]
During normal cooling tower operation, the three-way valve 33 communicates with the filtration device 32 and the electrolytic treatment device 34, and the three-way valve 35 is selected as a flow path that communicates with the electrolytic treatment device 34 and the cooling tower 1. The three-way valves 33 and 35 are switched so that the water from the filtration device 32 returns to the cooling tower 1 through the bypass pipe 36. In this state, the cleaning unit 39 operates, and the cleaning liquid is circulated from the cleaning unit 39 to the electrolytic treatment apparatus 34.
[0032]
Incidentally, the opening and closing valve provided in place of the three-way valve 33, 35, omitting the bypass pipe 36, a pump P ₂ is stopped during operation of the cleaning unit 39, the on-off valve may be closed.
[0033]
In this cooling water system, since the metal ion generator 7 and the electrolytic treatment apparatus 34 are automatically cleaned, the operation is continued for a long time without maintenance by a service person.
[0034]
During this time, the operation data of the metal ion generator 7, the concentration management device 21, the electrolytic treatment device 34, and the detection data of the electrical conductivity meter 20 and the ORP meter 30 are transmitted to the centralized management center via the communication device 40, respectively. It is stored on the host computer in the central management center.
[0035]
When the operations of the metal ion generator 7 and the electrolytic treatment apparatus 34 do not return to the steady state even when the cleaning units 15 and 39 are operated, the metal ion generator 7 and the electrolytic treatment apparatus 34 send a repair request signal. This repair request signal is reported from the communication device 40 to the central control center. The central management center transmits a signal requesting the dispatch of the service person to the service person dispatch center based on the repair request signal.
[0036]
Upon receiving the dispatch request, the service person pulls out the operation history data of the cooling water system from the host computer, carries replacement parts (for example, electrodes, sensors, packing, etc.), tools, etc., and visits the site for repair.
[0037]
【The invention's effect】
As described above, according to the present invention, the cooling water plant can be operated without maintenance for a long time, and when a repair by a service person is necessary, the service person can be dispatched and repaired quickly. In addition, a large number of cooling water plants installed throughout the country can be maintained by a small number of service personnel.
[Brief description of the drawings]
FIG. 1 is a system diagram of a cooling water system to which an operation management method for water treatment equipment according to an embodiment is applied.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cooling tower 3 Heat exchanger 7 Metal ion generator 10,11 Three-way valve 15 Cleaning unit 20 Conductivity meter 21 Concentration management device 30 ORP meter 32 Filtration device 33,35 Three-way valve 34 Electrolytic processing device 39 Cleaning unit 40 Communication equipment

Claims (3)

An operation state detection device for detecting an operation state of the water treatment device and a function recovery device for recovering the function of the water treatment device by washing are provided in a water treatment device for preventing a scale or slime of a cooling water system, An operation management method for water treatment equipment for operating the function recovery device based on the detection result of the state detection device,
An operation management method for a water treatment apparatus, wherein a repair request signal is generated when the function is not recovered even when the function recovery device is operated.   2. The operation management method for water treatment equipment according to claim 1, wherein a detection signal of the detection device is transmitted to a remote monitoring device via a communication line, and the repair request signal is generated from the remote monitoring device.   3. The water treatment apparatus according to claim 1, wherein the water treatment device includes an electrode for electrolytically treating water or eluting metal ions, and the function recovery device is a washing device for washing the electrode. An operation management method for water treatment equipment.

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