JP2000273661A - Method for feeding corrosion preventive chemical to water use device, and water treatment device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for feeding a corrosion preventive chemical to a water use device in which the supplement and maintenance period of the corrosion preventive chemical can be increased, and the chemical concentration can be easily controlled. SOLUTION: Water to be treated is fed from a discharge pipe 8 to a cooling tower through an introduction flow passage 3, a fluidized bed (an antibacterial agents treatment part) 2, and a flow-out passage 4 by the operation of a water feed pump P. A chemical feed tank 9 communicates with the flow-out passage 4 through a communication passage 11. The communication passage 11 communicates with the flow-out passage 4 in a condition where the water flowing in the flow-out passage 4 does not positively enter the communication passage 11. A solid chemical of the specified quantity charged in the chemical feed tank 9 is naturally dissolved in water, and the chemical component is diffused in water in the flow-out passage 4 through the communication passage 11 according to the differential concentration of the chemical component in the chemical feed tank 9 and the flow-out passage 4. The chemical component is conveyed into the cooling tower through a flow-out pipe 8 to implement the corrosion preventive function.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for supplying a corrosion inhibitor to a water utilization device, and more particularly to a method of utilizing a chemical component for preventing corrosion of a water utilization device such as a cooling tower or a water storage tank. The present invention relates to a method for supplying a corrosion inhibitor to a water utilization device supplied to a device and a water treatment device.

[0002]

2. Description of the Related Art In a water utilization apparatus such as a cooling tower or a water storage tank, a corrosion inhibitor is dissolved in water to prevent metal corrosion. For example, phosphorus pentoxide is used as a corrosion inhibitor. Then, as a method of dissolving the solid drug in water, a method in which the water to be treated is passed through a container filled with the solid drug, and the solid drug is directly dissolved in the water to be treated and used, There is a method in which an aqueous solution in which a drug is dissolved at a predetermined concentration is added to the water to be treated.

[0003]

It is necessary to control the concentration of the corrosion inhibitor in the water circulating in the water utilization device within a predetermined range. However, in the method in which the water to be treated is passed through the container filled with the solid drug, the replenishment and maintenance cycle of the drug are shortened, and it is difficult to control the concentration. In addition, since the water to be treated is brought into direct contact with the solid medicine, there is a problem that the water is clogged with dirt or contaminants contained in the water to be treated, and the surface of the medicine becomes dirty and becomes difficult to dissolve. In addition, the method of adding an aqueous solution in which a solid drug is dissolved in a predetermined concentration to water to be treated requires an operation of preparing an aqueous solution in which the solid drug is dissolved in a predetermined concentration and a device for gradually adding the aqueous solution from a tank of the aqueous solution by a predetermined amount. .

[0004] The present invention has been made in view of the above problems, and a first object of the present invention is to make it possible to lengthen the period of replenishment and maintenance of chemicals for preventing corrosion,
It is an object of the present invention to provide a method of supplying a corrosion inhibitor to a water utilization device that can easily control the concentration of the drug. Another object of the present invention is to provide a water treatment apparatus capable of performing the supply method.

[0005]

According to the first aspect of the present invention, there is provided a method for supplying a corrosion inhibitor to a water utilization device such as a cooling tower or a water storage tank. Inject the solid chemical for corrosion prevention into the chemical supply tank,
The solid medicine naturally dissolves in the water in the corrosion-inhibiting chemical supply tank, and the communication path provided in the corrosion-inhibiting chemical supply tank flows in the flow path in the middle of the flow path connected to the water utilization device. A flow of water is positively communicated so as not to enter the corrosion preventing chemical supply tank, and the dissolved chemical component is supplied to the flow path via the communication path by diffusion.

According to the second aspect of the present invention, the water treatment apparatus for supplying water to be treated to the antibacterial agent treatment section by the water supply pump and for sending the water treated by the antibacterial agent treatment section to the delivery channel has corrosion prevention. Equipped with a corrosion preventing chemical supply tank for naturally dissolving a solid chemical for use in water, and the flow of water flowing through the communication passage provided in the corrosion preventing chemical supply tank to the flow path of the water treatment device is positive. The communication was performed in such a manner as not to enter the corrosion-supplying chemical supply tank.

According to a third aspect of the present invention, in the second aspect of the present invention, the corrosion-inhibiting agent supply tank is connected to the delivery channel via the communication pipe. In the invention according to claim 4, in the invention according to claim 2,
The corrosion-preventing agent supply tank is attached to the water treatment device, and one end of the communication path is detachably connected to an antimicrobial agent inlet of the antimicrobial agent processing unit.

[0008] According to the first aspect of the present invention, the solid chemical for corrosion prevention, which has been charged into the corrosion prevention chemical supply tank, is naturally dissolved in the water in the corrosion prevention chemical supply tank. The dissolved drug component diffuses into the flow path through the communication path based on the difference between the concentration of the drug component in the water in the corrosion prevention drug supply tank and the concentration of the drug component in the water in the flow path. Carrying out the corrosion prevention function. Since the communication passage is communicated with the flow passage in a state where the flow of water flowing in the flow passage does not actively enter the corrosion prevention chemical supply tank, the communication passage passes from the flow passage into the corrosion prevention chemical supply tank through the communication passage. It is avoided that the water rushes and fluctuates the dissolution rate of the solid drug.

According to the second aspect of the present invention, the water to be treated, which has been sent to the antibacterial agent treatment section by the water supply pump, is subjected to the antibacterial treatment and then sent to the water utilization device via the sending water channel. The solid chemical for corrosion prevention put into the corrosion-preventive chemical supply tank is naturally dissolved in water in the corrosion-preventive chemical supply tank. Then, the dissolved drug component moves by diffusion into the flow path of the water treatment device via the communication path provided in the corrosion prevention drug supply tank.

According to a third aspect of the present invention, in the second aspect of the present invention, the chemical component dissolved in the corrosion-inhibiting chemical supply tank is supplied to the anti-bacterial agent treatment section at a downstream side of the antibacterial agent treatment section. Supplied to the road.

According to a fourth aspect of the present invention, in the second aspect of the present invention, the drug component dissolved in the corrosion preventing drug supply tank is supplied to an antibacterial agent processing section.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION (First Embodiment) The present invention will be described below to prevent bacteria and algae from propagating and adhering to water in a water utilization device such as a cooling tower or a water storage tank. Therefore, a first embodiment applied to a water treatment apparatus having an antibacterial agent treatment section will be described with reference to FIGS.

As shown in FIG. 1, the water treatment apparatus 1 has a fluidized bed 2 as an antibacterial agent treatment section filled with an antibacterial agent (not shown). The fluidized bed 2 is formed in a cylindrical shape with a conical bottom. At the bottom of the fluidized bed 2 there is an inlet channel 3
Is connected, and a delivery channel 4 is connected to the top of the fluidized bed 2. The introduction flow channel 3 is formed in a substantially U-shaped portion near a connection portion with the fluidized bed 2 and is formed so that the opposite side extends horizontally, and a connection port 3a is provided at an end thereof. The U-shaped portion of the introduction flow path 3 is provided with an outlet 5 having a lid 5a. The delivery channel 4 is formed so as to immediately and horizontally extend from a connection portion with the upper portion of the fluidized bed 2 and then bend and extend vertically downward, and has a connection port 4a at an end thereof. . In the upper part of the fluidized bed 2, an antimicrobial agent inlet 6 having a lid 6a is provided. Further, a transparent window 2a is provided in an intermediate portion of the fluidized bed 2.

A water pump P is provided below the introduction flow path 3, and an introduction pipe 7 is connected between a discharge side thereof and a connection port 3 a of the introduction flow path 3. In addition, the connection port 4 of the delivery channel 4
The other end of the outflow pipe 8 having one end connected to a pipe leading to a cooling tower (not shown) is connected to a.

Above the delivery channel 4, a corrosion prevention chemical supply tank (hereinafter referred to as a chemical supply tank) 9 is provided. The medicine supply tank 9 is disposed horizontally long, and an upper portion of the medicine supply tank 9 is provided with an inlet 10 for a corrosion prevention medicine provided with a lid 10a. A communication path 11 communicating with a horizontal portion of the delivery flow path 4 is provided below the medicine supply tank 9. The communication path 11 communicates with the delivery channel 4 in a state where the flow of water flowing in the delivery channel 4 does not actively enter the communication channel 11, that is, a state in which the flow of water does not actively flow into the medicine supply tank 9. . In this embodiment, the communication passage 11 is formed so as to extend straight downward. A filter (not shown) is provided at the base end of the communication path 11. The filter serves to prevent the solid corrosion inhibitor (hereinafter, referred to as solid medicine) M (shown only in FIG. 3) contained in the medicine supply tank 9 from dropping into the communication passage 11. For example, the size of the solid medicine M is 3-5 cm in length and 2-3 in width.
In the case of about cm, the size of the eyes on the filter is 5-10m
A net of about m is used. The size of the eyes is changed depending on the size of the solid medicine M.

The size of the chemical supply tank 9 depends on the amount of water used in the target water utilization device.
When the amount of circulating water in the target cooling tower is 390 (t / h), the volume is approximately 3400 cubic centimeters and the amount of the used solid medicine is 3000 g. In addition, the cooling tower circulating water amount is 2000
In the case of (t / h), the volume is approximately 13300 cubic centimeters, the amount of the solid medicine used is 12 kg, and the amount of circulating water in the cooling tower is 3000.
In the case of (t / h), the volume is approximately 20400 cubic centimeters and the used amount of the solid medicine is 18 kg.

The fluidized bed 2, the introduction flow path 3, the delivery flow path 4, the chemical supply tank 9 and the communication path 11 are described in JP-A-8-47692.
And a pair of plate-like bodies 12 made of glass fiber reinforced plastic (FRP).
The recessed portions formed in a and 12b are opposed to each other, and the flat surfaces that are in contact with each other are bonded to each other. In addition, the water supply pump P, the upstream side of the outlet 5 of the introduction flow path 3, the introduction pipe 7,
The lower part of the delivery channel 4 and the outflow pipe 8 are shown in FIG.
As shown in FIG. 2B, the cover 13 is covered with a cover 14 fixed to the plate 12a with bolts 13.

Next, the water treatment apparatus 1 configured as described above
The operation of will be described. After a predetermined amount of a solid antibacterial agent is injected into the fluidized bed 2 from the inlet 6, the fluidized bed 2, the introduction flow path 3,
The delivery channel 4 and the communication path 11 are filled with water. The injected antibacterial agent is supplied to the introduction flow path 3 while the operation of the water supply pump P is stopped.
And accumulates in the lower part of the fluidized bed 2. The medicine supply tank 9
When a predetermined amount of water is stored in the
Is supplied with a predetermined amount of the solid medicine M. In this embodiment, phosphorus pentoxide is used as the solid drug M. This phosphorus pentoxide is used as needle-like crystals which are easily soluble in water.
It is a substance having an orthorhombic crystal structure manufactured by being heated to 500C and left standing at 500C or more for several days, and gradually dissolved in water.

When the water supply pump P is operated from this state, the water to be treated is supplied to the fluidized bed 2 through the introduction flow path 3,
The antibacterial agent stored in the lower part of the fluidized bed 2 and the introduction flow path 3 is moved by the discharged water to be treated, and is fluidized and stirred in the fluidized bed 2. Then, the antibacterial component is eluted from the antibacterial agent into the water while the water to be treated passes through the fluidized bed 2, and the water that has been treated with the antibacterial agent passes through the delivery channel 4 and the outflow pipe 8 to a cooling tower (not shown). Is sent. While the antibacterial agent is fluidized and stirred in the fluidized bed 2, the antibacterial agents collide with each other to activate the surface of the antibacterial agent. The flow state of the antimicrobial agent in the fluidized bed 2 can be observed from the transparent window 2a, and it can be confirmed that the antimicrobial agent is in an appropriate flow state. The antibacterial agent is taken out from the outlet 5 with the operation of the water pump P stopped.

FIG. 3 is a schematic diagram for explaining the operation of supplying the drug component of the solid drug M from the drug supply tank 9 to the delivery channel 4. Solid medicine M put into medicine supply tank 9
Is gradually dissolved spontaneously upon contact with water in the chemical supply tank 9. Since the specific gravity of the drug component is larger than that of water, a portion where the concentration of the drug component is high exists at the bottom of the drug supply tank 9. Since the drug supply tank 9 is in communication with the delivery channel 4 via the communication path 11, the drug component diffuses into the communication path 11 due to the concentration difference between the drug components in the drug supply tank 9 and the communication path 11. The drug component diffuses into the water in the delivery channel 4 due to the difference in the concentration of the drug component in the communication channel 11 and the delivery channel 4. And it is carried to the cooling tower via the outflow pipe 8,
Exhibits corrosion prevention function.

This embodiment has the following effects.
(1) The drug component dissolved in the water in the drug supply tank 9 is based on the difference between the concentration in the drug supply tank 9 and the concentration in a part of the flow path of the water treatment device 1 (delivery flow path 4). Since it moves into the channel by diffusion, supply of chemicals for corrosion prevention
The maintenance cycle can be lengthened. In addition, a predetermined range around the solid drug M is saturated with the drug component, and the concentration on the drug supply tank 9 side that determines the diffusion speed through the communication path 11 is substantially constant at the saturated concentration.
Diffusion can be controlled with a stable drug concentration.

(2) The communication passage 11 provided in the medicine supply tank 9 is communicated with the delivery flow path 4 in a state where the flow of water flowing in the delivery flow path 4 does not actively enter the medicine supply tank 9. Since the solid medicine M is put into the medicine supply tank 9 and naturally dissolved in water, the management of the medicine concentration can be facilitated.

(3) Since the drug component is supplied to the delivery channel 4 by diffusion through the communication channel 11, the concentration of the drug supplied to the delivery channel 4 can be easily controlled by the diameter of the communication channel 11. . That is, by setting the diameter of the communication path 11 in accordance with the amount of circulating water in the cooling tower, the concentration of the drug supplied to the delivery flow path 4 can be controlled to an appropriate concentration.

(4) Since the water to be treated is not directly passed through the solid drug M, the flow path is not clogged by dirt and impurities contained in the water to be treated, and the surface of the drug is not contaminated. (5) The chemical treatment tank 9 is provided in the water treatment device 1 that performs water treatment for preventing water and contamination by preventing bacteria and algae from growing and adhering in the water utilization device. And antibacterial treated water can be supplied to the water utilization device.

(6) The chemical supply tank 9 is the water treatment device 1
The medicine supply tank 9 is disposed at a position that does not interfere with the water supply pump P or the antibacterial agent treatment section (fluidized bed 2) of the water treatment apparatus 1 because the medicine supply tank 9 is communicated with the delivery flow path 4 at the upper portion of the water treatment apparatus via the communication path 11. Easier to do.

(Second Embodiment) Next, a second embodiment will be described with reference to FIGS. This embodiment is significantly different from the previous embodiment in that the medicine supply tank is formed as a separate body, and that the communication path is connected to the fluidized bed 2 instead of the delivery flow path 4. That is, the configuration of the medicine supply tank and the communication path, and the point that there is no communication hole in the delivery flow path 4 are different from the above-described embodiment, and other configurations are the same. The same portions are denoted by the same reference numerals and description thereof will be omitted.

As shown in FIGS. 4A and 4B, the chemical supply tank 15 is a plate-like body 12a,
12b, it is fixed horizontally at the upper end. The medicine supply tank 15 is composed of a plastic cylinder 16 and a bottomed cylindrical lid 17 fixed to both ends thereof. As the plastic, a transparent resin such as polyvinyl chloride, acrylic resin, or polycarbonate is used. As the material of the lid 17, the same material as the cylinder 16, metal, FRP, or the like is used.
If the lid 17 is made of the same material, the cylinder 16 and the lid 17
Are welded, and when manufactured by metal or FRP, they are bonded by an adhesive. An inlet 18 for the solid medicine M is provided substantially at the center of the cylinder 16, and a lid 18 a is attached to the inlet 18.

As shown in FIG. 5B, mounting pieces 19 are provided at the same positions on the peripheral surfaces of the two lids 17, respectively.
The attachment piece 19 is formed in an inverted L-shape with the medicine supply tank 15 fixed to the water treatment apparatus 1, and a nut 21 into which a screw (a thumb screw in this embodiment) 20 is screwed is fixed. I have. A hole is formed in the mounting piece 19 at a position corresponding to the screw hole.
As shown in FIG. 5 (b) and FIG. 5 (b), in a state where both mounting pieces 19 are hooked on the upper ends of the plate-like bodies 12a and 12b, a thumbscrew 20 which is screwed to the nut 21 and penetrates the hole is provided. Thus, it is fastened and fixed to the upper ends of the plate members 12a and 12b.

As shown in FIG. 5A, a connecting portion 23 for connecting one end of a communication pipe 22 as a communication passage is provided on one lid 17 on the side opposite to the position where the mounting piece 19 is provided. I have.
Then, as shown in FIGS.
The other end of the water treatment device 1 is detachably connected to the inlet 6 via a coupler 24, and the medicine supply tank 15 and the upper part of the fluidized bed 2 which is a part of the flow path of the water treatment device 1 The flow of the water flowing in the road is communicated in a state where the flow does not actively enter the communication pipe 22. A filter is provided at the end of the communication pipe 22 on the side of the medicine supply tank 15.

In the water treatment apparatus 1 of this embodiment, when the antibacterial agent is introduced into the fluidized bed 2, the communication pipe 22
Is removed from the charging port 6 and charged from the opening.
Then, similarly to the above-described embodiment, when the water supply pump P is operated, the water to be treated undergoes the antibacterial treatment while passing through the fluidized bed 2. Further, after the drug component of the solid drug M naturally dissolved in the drug supply tank 15 is supplied to the fluidized bed 2 through the communication pipe 22 by diffusion, the delivery flow path 4 and the outflow pipe 8
And then supplied to the cooling tower.

This embodiment has the following effects in addition to the effects (1) to (5) of the above embodiment. (7) By equipping the existing water treatment apparatus provided with the antibacterial agent treatment section with the separately formed drug supply tank 15, the existing water treatment apparatus having only the antibacterial agent treatment section without the corrosion prevention treatment section is provided. It can be easily applied to water treatment equipment.

(8) The communication pipe 22 for communicating the chemical supply tank 15 with the water flow path of the water treatment device 1 is
Is removably connected to the inlet 10 through a coupler 24, so that it can be easily applied to an existing water treatment apparatus only by retrofitting the chemical supply tank 15 without modifying existing facilities.

The embodiment is not limited to the above, and may be embodied as follows, for example. (Circle) the chemical supply tank may be accommodated in the fluidized bed 2. For example, as shown in FIG. 6, a medicine supply tank 2 integrally formed with a lid 25 of the fluidized bed 2 above the fluidized bed 2.
6 is provided. The medicine supply tank 26 is provided with a lid 27, and a communication passage 2 extending horizontally or slightly inclined upward is provided at a lower part.
6a. A filter 28 is provided at the base end of the communication passage 26a. In this embodiment, the drug supply tank 26 is contained in the fluidized bed 2, and the solid drug M dissolved in the drug supply tank 26 is supplied into the fluidized bed 2. In this case, since the medicine supply tank 26 is housed in the fluidized bed 2, it is easy to secure a space for disposing the medicine supply tank 26.

The chemical supply tank 15 is not limited to a structure incorporated in a part of the water treatment apparatus 1 having an antibacterial agent treatment section, but is disposed near a pipe of a water utilization apparatus such as a cooling tower or a water storage tank. The communication pipe 22 may be connected to the pipe in a state where the flow of water flowing inside does not actively enter the medicine supply tank.
In this case, the degree of freedom of the arrangement position of the medicine supply tank increases.

The antibacterial agent treatment section is not limited to the fluidized bed 2 and may be configured so that water to be treated passes through a treatment tank filled with an antibacterial agent. ○ Solid chemicals for corrosion prevention are not limited to phosphorus pentoxide, but other chemicals such as inorganic corrosion inhibitors such as polyphosphate, polysilicate and molybdate, and organic chemicals such as MBT (2-mercaptobenzothiazole). A system corrosion inhibitor may be used.

The technical ideas (inventions) other than those described in the claims which can be grasped from the embodiment will be described below together with their effects. (1) In the invention as set forth in claim 2, the antibacterial agent treating section is constituted by a fluidized bed in which an antibacterial agent flows by water to be treated fed by a water supply pump, and the corrosion preventing agent supply tank is provided in the fluidized bed. Is housed. In this case, since the corrosion prevention chemical supply tank is accommodated in the fluidized bed of the water treatment device, it is easy to secure a space for disposing the corrosion prevention chemical supply tank.

[0037]

As described in detail above, claims 1 to 4 are provided.
According to the invention described in (1), the replenishment / maintenance cycle of the corrosion preventing agent can be lengthened, and the agent concentration can be easily managed.

According to the second to fourth aspects of the present invention, a water treatment device for performing water treatment for preventing bacteria and algae from growing and adhering in the water utilization device and contaminating the water is provided. Since the supply tank is provided, water subjected to the corrosion prevention treatment and the antibacterial treatment can be supplied to the water utilization device.

According to the third aspect of the present invention, it becomes easy to arrange the corrosion preventing chemical supply tank at a position where it does not interfere with the water supply pump or the antibacterial agent processing section of the water treatment apparatus. According to the fourth aspect of the present invention, the present invention can be easily applied to an existing water treatment apparatus only by retrofitting a corrosion prevention chemical supply tank without modifying an existing facility.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a water treatment device according to a first embodiment.

FIG. 2A is a front view of a water treatment apparatus with a cover attached, and FIG. 2B is a side view of the same.

FIG. 3 is a schematic diagram for explaining the action of supplying a drug component of a solid drug.

FIG. 4A is a partial front view of a water treatment apparatus according to a second embodiment, and FIG. 4B is a partial side view thereof.

FIG. 5A is a schematic perspective view of a medicine supply tank,
(B) is a schematic perspective view similarly seen from the back side.

FIG. 6 is a partial schematic view of a water treatment apparatus according to another embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Water treatment apparatus, 2 ... Fluidized bed as an antibacterial agent processing part, delivery flow path which comprises a part of flow path, 9, 15 ... Corrosion prevention chemical supply tank, 11 ... Communication path, 22 ... Communication path Communication pipe, P: water pump, M: solid medicine.

Claims (4)

[Claims] 1. A method for supplying a corrosion inhibitor to a water utilization device such as a cooling tower or a water storage tank, wherein a solid agent for preventing corrosion is put into a corrosion inhibitor supply tank, and the solid agent is corroded. While naturally dissolving in the water in the anti-corrosion chemical supply tank, the flow of water flowing in the flow path is positive in the middle of the flow path connected to the water utilization device through the communication passage provided in the anti-corrosion chemical supply tank. To communicate in a state that does not enter the corrosion inhibitor chemical supply tank,
A method for supplying a corrosion inhibitor to a water utilization device for supplying a dissolved drug component to the flow path through the communication path by diffusion. 2. A water treatment apparatus for supplying water to be treated to an antibacterial agent treatment section by a water supply pump and sending water treated by the antibacterial agent treatment section to a delivery flow path. A corrosion-inhibiting agent supply tank for spontaneously dissolving is provided, and the flow of water flowing through the communication passage provided in the corrosion-inhibiting agent supply tank to the flow path of the water treatment device is positively supplied to the corrosion-inhibiting agent supply. A water treatment device that communicates without entering the tank. 3. The water treatment apparatus according to claim 2, wherein the corrosion prevention chemical supply tank is connected to the delivery flow path via the communication path. 4. The anti-corrosion agent supply tank according to claim 2, wherein the anti-corrosion agent supply tank is retrofitted to the water treatment device, and one end of the communication path is detachably connected to an antimicrobial agent inlet of the antimicrobial agent processing section. Water treatment equipment.