KR101267594B1 - Apparatus for recovery of cation-exchang resin and apparatus for removal of cation thereof and recovery method of cation-exchange resin and removal method of cation therof - Google Patents

Abstract

The present invention relates to a cation removal device and a removal method that can effectively control the regeneration process of the cation exchange resin, the cation exchange resin regeneration device as one embodiment of the present invention, the cation to receive the raw water from the raw water supply unit for cation exchange Exchange resin; A sodium chloride (NaCl) supply unit for supplying sodium chloride (NaCl) to the cation exchange resin; Soft water supply unit for supplying soft water to the cation exchange resin; A pH meter and a conductivity meter provided on the discharge line of the cation exchange resin; And a control unit for receiving a signal from a pH meter and a conductivity meter to control a sodium chloride (NaCl) supply unit and a soft water supply unit, wherein the pH meter and the conductivity meter are configured to measure pH and conductivity measurements of the discharge from the cation exchange resin. Sending a signal to the control unit, the control unit is characterized in that for controlling the sodium chloride (NaCl) supply unit and soft water supply unit.

Description

Cation exchange resin regeneration device and cation removal device including the same, cation exchange resin regeneration method using the same and cation removal method including the same RESIN AND REMOVAL METHOD OF CATION THEROF}

The present invention relates to a cation removal device and a removal method, and more particularly, to a cation removal device and a removal method that can effectively control the regeneration process of the cation exchange resin.

Ion exchange resins are used for pure water treatment in various fields such as pure water treatment facilities such as nuclear power plants and thermal power plants, or raw water treatment supplied to chemical plants and semiconductor industries or industrial boilers. In particular, the regeneration process of the cation exchange resin is essential in the pure water treatment process using the cation exchange resin.

Background art of the present invention is disclosed in Korean Unexamined Patent Publication No. 1997-014811 (published on April 28, 1997, titled invention: ion exchange resin regeneration device).

It is an object of the present invention to provide a cation exchange resin regeneration apparatus and a cation removal device including the same that can effectively control the regeneration process of the cation exchange resin to improve the regeneration efficiency.

Another object of the present invention is to provide a regeneration method and a cation removal method of the cation exchange resin that can effectively control the regeneration process of the cation exchange resin to improve the regeneration efficiency.

Cation exchange resin regeneration device according to an aspect of the present invention, the cation exchange resin for cation exchange the raw water supplied from the raw water supply; A sodium chloride (NaCl) supply unit for supplying sodium chloride (NaCl) to the cation exchange resin; Soft water supply unit for supplying soft water to the cation exchange resin; A pH meter and a conductivity meter provided on the discharge line of the cation exchange resin; And a control unit for receiving a signal from the pH meter and the conductivity meter to control the sodium chloride (NaCl) supply unit and the soft water supply unit, wherein the pH meter and the conductivity meter measure the pH of the discharge liquid from the cation exchange resin. A signal for a value and a conductivity measurement is sent to the control unit, and the control unit receives the signal to control the sodium chloride (NaCl) supply unit and the soft water supply unit.

Preferably, the sodium chloride (NaCl) supply unit may be a cation exchange resin regeneration device that is controlled to stop the supply of sodium chloride (NaCl) when the measured value of the pH meter is 7.0 ~ 7.4.

Preferably, the soft water supply unit is controlled to start soft water supply when sodium chloride (NaCl) supply is stopped, and cation exchange controlled to stop soft water supply when the measured value of the conductivity meter reaches the conductivity of the soft water being supplied. It may be a resin recycling apparatus.

More preferably, the conductivity of the soft water supplied may be a cation exchange resin regeneration device of 30 ~ 100 ㎲ / ㎝.

The cation removal device in another aspect of the present invention includes the above cation exchange resin regeneration device.

Cation exchange resin regeneration method according to another aspect of the present invention, in the cation exchange resin regeneration method using the cation exchange resin regeneration device, (B-1) supplying raw water; (B-2) supplying sodium chloride (NaCl) by controlling the sodium chloride (NaCl) supply unit; And (B-3) stopping the sodium chloride (NaCl) supply and supplying soft water by controlling the soft water supply unit, wherein the pH meter and the conductivity meter are pH measured values of the discharge liquid from the cation exchange resin. And transmitting a signal for a conductivity measurement value to the control unit, wherein the control unit receives the signal to control the sodium chloride (NaCl) supply unit and the soft water supply unit.

Preferably, when the measured value of the pH meter is 7.0 ~ 7.4, the sodium chloride (NaCl) supply may be a cation exchange resin regeneration method for controlling to stop the supply of sodium chloride (NaCl).

Preferably, when the sodium chloride (NaCl) supply stops supplying sodium chloride (NaCl), then the soft water supply is controlled to start supplying soft water, and when the measured value of the conductivity meter reaches the conductivity of soft water supplied, It may be a cation exchange resin regeneration method for controlling the soft water supply to stop the soft water supply.

More preferably, the conductivity of the soft water supplied may be a cation exchange resin regeneration method of 30 ~ 100 ㎲ / ㎝.

In another aspect of the present invention, a method for removing cation of raw water includes: (c) removing a cation in raw water using the cation exchange resin; And (B) regenerating the cation exchange resin, wherein regenerating the cation exchange resin comprises: (B-1) controlling the raw water supply unit to stop supplying raw water; (B-2) supplying sodium chloride (NaCl) by controlling the sodium chloride (NaCl) supply unit; And (B-3) stopping the sodium chloride (NaCl) supply and supplying soft water by controlling the soft water supply unit, wherein the pH meter and the conductivity meter are pH measured values of the discharge liquid from the cation exchange resin. And a signal for a conductivity measurement value is sent to the control unit, and the control unit receives the signal to control the sodium chloride (NaCl) supply unit and the soft water supply unit.

Preferably, when the measured value of the pH meter is 7.0 ~ 7.4, it may be a cation removal method to control the sodium chloride (NaCl) supply unit to stop the supply of sodium chloride (NaCl).

Preferably, when the sodium chloride (NaCl) supply stops supplying sodium chloride (NaCl), then the soft water supply is controlled to start supplying soft water, and when the measured value of the conductivity meter reaches the conductivity of soft water supplied, It may be a cation removal method for controlling the soft water supply unit to stop the soft water supply.

More preferably, the conductivity of the soft water supplied may be a cation removal method of 30 ~ 100 ㎲ / ㎝.

According to the present invention, in the regeneration process of the cation exchange resin, by controlling the amount of sodium chloride (NaCl) for the cation substitution and the soft water supply for the cleaning using the pH and conductivity measurements, the regeneration process of the cation exchange resin more effectively It can control, and the improvement of cation exchange resin regeneration efficiency can be expected.

1 is a view schematically showing a cation removal device according to an embodiment of the present invention.
Figure 2 is a graph showing the change in pH measurement value of the cation exchange resin regeneration process according to an embodiment of the present invention.
3 is a graph showing the change in conductivity measurement value of the cation exchange resin regeneration process according to an embodiment of the present invention.

Hereinafter, a cation exchange resin regeneration device, a cation removal device including the same, a cation exchange resin regeneration method using the same, and a cation removal method including the same will be described with reference to the accompanying drawings. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation.

In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of a user or an operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

Boilers, etc. in the use of the raw water fed to the industrial equipment, in particular when using the ocean water as raw water, divalent ions such as Mg ^{2 +,} Ca ^{2 +} in water at ocean is the primary cause of forming the scale (scale), etc. Boilers It is a substance. Therefore, it is necessary to remove the cations in the raw water supplied to extend the life of the plant.

1 is a view schematically showing a cation removal device according to an embodiment of the present invention.

In the cation exchange resin regeneration device according to an aspect of the present invention, the cation exchange resin (2) for cation exchange receiving raw water from the raw water supply unit (1), and the sodium chloride to supply sodium chloride (NaCl) to the cation exchange resin (2) (NaCl) supply part 3, a soft water supply part 4 for supplying soft water to the cation exchange resin 2, a pH meter 6 and a conductivity meter 7 provided on the discharge line 5 of the cation exchange resin And a controller 8 which receives signals from the pH meter and the conductivity meter to control the sodium chloride (NaCl) supply unit and the soft water supply unit.

The pH meter 6 and the conductivity meter 7 send signals from the cation exchange resin 2 to the controller 8 for pH measurements and conductivity measurements of the effluent. The control unit 8 receives a signal to control the sodium chloride (NaCl) supply unit 3 and the soft water supply unit (4). The pH meter 6 and the conductivity meter 7 are installed on the discharge liquid discharge line 5 so as to measure the pH and conductivity of the discharge liquid during the regeneration of the cation exchange resin 2. On the discharge line 5, the position of the pH meter 6 and the conductivity meter 7 does not affect the present invention.

Preferably, the sodium chloride (NaCl) supply unit may be controlled to stop the supply of sodium chloride (NaCl) when the pH meter has a measured value of 7.0 to 7.4. When sodium chloride (NaCl) is supplied, the pH value initially increases to the strong base value due to the increase of NaOH in the effluent, but when the supply of sodium chloride (NaCl) continues, the pH value is returned to the neutral value of 7.0 to 7.4. . The pH value of the discharged liquid reached 7.0 to 7.4, indicating that the sodium chloride (NaCl) supplied after the substitution reaction of the cation exchange resin with sodium chloride (NaCl) was completed.

Preferably, the soft water supply unit 4 is controlled to start soft water supply when sodium chloride (NaCl) supply is stopped, and to stop soft water supply when the measured value of the conductivity meter 7 reaches the conductivity of soft water supplied. It may be a controlled cation exchange resin regeneration device.

More preferably, the conductivity of the soft water supplied may be a cation exchange resin regeneration device having a 30 to 100 kPa / cm.

At the beginning of the soft water supply, the conductivity value is high due to the sodium chloride (NaCl) that is washed and discharged. However, when the soft water supply is continued, the conductivity value of the discharged liquid returns to the soft water value. The conductivity of the discharged liquid reached the conductivity of the soft water supplied, indicating that all of the remaining sodium chloride (NaCl) solution in the cation exchange resin was discharged, and the soft water discharged after washing of the cation exchange resin was completed. .

The cation removal device in another aspect of the present invention includes the cation exchange resin regeneration device described above.

Cation exchange resin regeneration method according to another aspect of the present invention, in the cation exchange resin regeneration method using the cation exchange resin regeneration device, (B-1) supplying raw water; (B-2) controlling sodium chloride (NaCl) supply part 3 to supply sodium chloride (NaCl); And (B-3) stopping the sodium chloride (NaCl) supply, and then supplying soft water by controlling the soft water supply unit 4, wherein the pH meter 6 and the conductivity meter 7 include a cation exchange resin 2 The signal for the pH measurement value and conductivity measurement value of the discharged liquid is sent to the control part 8, and the control part 8 receives the signal and controls the sodium chloride (NaCl) supply part 3 and the soft water supply part 4.

Preferably, when the measured value of the pH meter is 7.0 ~ 7.4, it may be a cation exchange resin regeneration method for controlling the sodium chloride (NaCl) supply unit 3 to stop the supply of sodium chloride (NaCl).

Preferably, when the sodium chloride (NaCl) supply section 3 stops supplying sodium chloride (NaCl), then the soft water supply section 4 is controlled to start the soft water supply, and the soft water to which the measured value of the conductivity meter 7 is supplied. When the conductivity is reached, it may be a cation exchange resin regeneration method for controlling the soft water supply unit 4 to stop the soft water supply.

More preferably, the conductivity of the soft water supplied may be a cation exchange resin regeneration method of 30 ~ 100 dl / cm.

In another aspect of the present invention, a method for removing cation of raw water includes: (c) removing a cation in raw water using a cation exchanger using the cation removal method; And (B) regenerating the cation exchange resin (2), wherein regenerating the cation exchange resin (2) comprises: (B-1) controlling the raw water supply unit (1) to stop the raw water supply; (B-2) controlling sodium chloride (NaCl) supply part 3 to supply sodium chloride (NaCl); And (B-3) stopping the supply of sodium chloride (NaCl), and then supplying soft water by controlling the soft water supply unit 4. The pH meter 6 and the conductivity meter 7 send signals to the control unit 8 for the pH measurement and the conductivity measurement value of the discharged liquid from the cation exchange resin, and the control unit 8 receives the signal and receives sodium chloride (NaCl). Control the supply and soft water supply.

Preferably, when the measured value of the pH meter 6 is 7.0 ~ 7.4, it may be a cation removal method for controlling the sodium chloride (NaCl) supply unit 3 to stop the supply of sodium chloride (NaCl).

Preferably, when the sodium chloride (NaCl) supply section 3 stops supplying sodium chloride (NaCl), then the soft water supply section 4 is controlled to start the soft water supply, and the soft water to which the measured value of the conductivity meter 7 is supplied. When the conductivity is reached, the soft water supply unit 4 may be a cation removal method for controlling to stop the soft water supply.

More preferably, the conductivity of the soft water supplied may be a cation removal method of 30 ~ 100 dl / cm.

Referring to each step of the cation removal process using a cation removal device based on Figures 1 to 3 as follows.

(A) cation removal step

Raw water is supplied from the raw water supply unit 1 to the cation exchange resin 2. In the cation exchange resin 2, the cation in the raw water is removed according to the following formula (1). Ca ²⁺ ions of the formula (1) are examples described as representative of cations in raw water. Cations such as Mg ^{2 +} and Ca ^{2 +} in the raw water, like also is removed according to a similar formula. That is, the following chemical formula is merely a chemical formula showing an example of a substitution reaction occurring in the cation exchange resin in the cation removal step.

(B) cation exchange resin regeneration step

When the cation exchange resin 2 removes the cation in the raw water to the saturation level by the substitution reaction, no further substitution reaction occurs, and at this time, a process of regenerating the cation exchange resin 2 is necessary. The cation exchange resin regeneration process includes a raw water supply stop step, a substitution step, and a washing step.

(B-1) Raw water supply stop phase

When the cation exchange resin 2 reaches the cation substitution saturation level, in order to start the cation exchange resin regeneration process, the raw water supply unit 1 is first controlled to stop the supply of raw water.

(B-2) Substitution Step

Sodium chloride (NaCl) solution is supplied to the cation exchange resin (2) from the sodium chloride (NaCl) supply (3). As the Na ⁺ ions in the feed of sodium chloride (NaCl) solution was replaced with Ca ^{2 +} ions of the cation exchange resin, to which the cation exchange resin regeneration. The substitution step is according to the formula (2) below.

In this process, the discharge liquid is discharged to the discharge line 5 through the cation exchange resin (2), the pH is rapidly increased as the regeneration begins, and when the regeneration is completed, the pH of the sodium chloride (NaCl) solution (7.0 ~ 7.4) is again increased. Will fall.

Figure 2 is a graph showing the change in pH measurement value of the cation exchange resin regeneration process according to an embodiment of the present invention. As the pH solution is introduced (time (A)), it can be seen that the pH is rapidly increased by ion substitution of the cation exchange resin. The pH increased to a strong base falls back to the neutral pH range as the substitution is completed. It can be seen that the substitution reaction of the cation exchange resin by Na ⁺ ions was terminated (time (B)) from the pH of the discharged liquid dropped to 7.0 to 7.4.

When the measured value of the pH meter 6 reaches the set range of 7.0 to 7.4, the control unit 8 receives the corresponding signal from the pH meter 6, and then sends a signal to the sodium chloride (NaCl) supply unit (3). The replacement step is terminated by stopping the supply of sodium chloride (NaCl).

(B-3) washing step

When the substitution step ends, the cleaning step then begins. The washing step is to remove sodium chloride (NaCl) solution remaining in the cation exchange resin. The washing step is performed by supplying soft water after the supply of sodium chloride (NaCl) solution is stopped.

3 is a graph showing the change in conductivity measurement value of the cation exchange resin regeneration step according to an embodiment of the present invention.

When the soft water is supplied (time (C)) after the substitution step is completed (time (B)) during the regeneration of the cation exchange resin, the conductivity value of the effluent is about 62000 dl / cm, which is the conductivity of sodium chloride (NaCl). Begins to decrease sharply. The moment when the conductivity value of the discharged liquid reaches the conductivity value of the soft water supplied (time (D)) is the point at which the cation exchange resin is cleaned. That is, it can be confirmed that the cleaning is completed from the conductivity of the discharge liquid reaches 30 ~ 100 dl / cm.

When the measured value of the conductivity meter 7 reaches a set range, for example, 30 to 100 mW / cm, the control unit sends a signal to the soft water supply unit 4 to stop the supply of soft water to terminate the washing step. This completes the regeneration of the cation exchange resin. However, the conductivity value of the soft water supplied will be determined by the conductivity value of the soft water actually supplied in the washing step, and the present invention is not limited to the above range.

As described above, when the cation of the raw water is removed and the regeneration of the cation exchange resin is performed using the cation removal device including the cation exchange resin regeneration device of the present invention, the completion point of the substitution reaction in the cation exchange resin and the point of washing completion are determined. Accurately identify and control the pH solution and soft water supplied. Through this, by effectively controlling the regeneration process of the cation exchange resin, it is possible to improve the cation exchange resin regeneration efficiency. In particular, the regeneration rate of the cation exchange resin is kept constant by controlling the supply of sodium chloride (NaCl) and soft water in the substitution and washing steps, which are variable depending on the degree of saturation of the cation exchange resin, to the pH value and the conductivity value of the discharge liquid. The reliability of the process can be ensured.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. will be.

In addition, the method of removing the cation of the boiler feed water has been described as an example, but this is merely illustrative, and the technical idea of the present invention may be applied to the method of removing cation of other raw water other than the boiler feed water. Accordingly, the true scope of the present invention should be determined by the following claims.

1: raw water supply
2: cation exchange resin
3: sodium chloride (NaCl) supply
4: soft water supply
5: discharge line
6: pH meter
7: conductivity meter
8: control unit

Claims (13)

A cation exchange resin that receives raw water from a raw water supply unit and cation exchanges it;
A sodium chloride (NaCl) supply unit for supplying sodium chloride (NaCl) to the cation exchange resin;
Soft water supply unit for supplying soft water to the cation exchange resin;
A pH meter and a conductivity meter provided on the discharge line of the cation exchange resin; And
It comprises a control unit for receiving the signal from the pH meter and the conductivity meter to control the sodium chloride (NaCl) supply unit and the soft water supply unit,
The pH meter and the conductivity meter sends a signal for the pH and conductivity measurements of the discharge from the cation exchange resin to the control unit,
The control unit is a cation exchange resin regeneration device, characterized in that for controlling the sodium chloride (NaCl) supply unit and the soft water supply unit in response to the signal.
The regeneration device of claim 1, wherein the sodium chloride (NaCl) supply unit is controlled to stop the supply of sodium chloride (NaCl) when the measured value of the pH meter is 7.0 to 7.4.
The method of claim 1, wherein the soft water supply unit is controlled to start soft water supply when sodium chloride (NaCl) supply is stopped, and to stop soft water supply when the measured value of the conductivity meter reaches the conductivity of soft water supplied. Cation exchange resin regeneration device, characterized in that.
The cation exchange resin regeneration device according to claim 3, wherein the supplied soft water has a conductivity of 30 to 100 mW / cm.
A cation removal device comprising the cation exchange resin regeneration device according to any one of claims 1 to 4.
In the cation exchange resin regeneration method using the cation exchange resin regeneration device according to any one of claims 1 to 4,
(B-1) stopping supply of raw water;
(B-2) supplying sodium chloride (NaCl) by controlling the sodium chloride (NaCl) supply unit; And
(B-3) after stopping the supply of sodium chloride (NaCl), controlling the soft water supply unit to supply soft water;
The pH meter and the conductivity meter sends a signal for the pH and conductivity measurements of the discharge from the cation exchange resin to the control unit,
And the control unit controls the sodium chloride (NaCl) supply unit and the soft water supply unit in response to the signal.
7. The method of claim 6, wherein when the measured value of the pH meter is 7.0 to 7.4, the sodium chloride (NaCl) supply unit is controlled to stop the supply of sodium chloride (NaCl).
The method according to claim 6, wherein when the sodium chloride (NaCl) supply stops supplying sodium chloride (NaCl), the soft water supply is then controlled to start soft water supply, and the conductivity of the soft water at which the measured value of the conductivity meter is supplied is reached. And the soft water supply unit stops the soft water supply.
The method for regenerating a cation exchange resin according to claim 8, wherein the conductivity of the soft water supplied is 30 to 100 mW / cm.
In the cation removal method using the cation removal device of claim 5,
(A) removing the cation in the raw water using the cation exchange resin; And
(B) regenerating the cation exchange resin,
Regenerating the cation exchange resin,
(B-1) controlling the raw water supply unit to stop the raw water supply;
(B-2) supplying sodium chloride (NaCl) by controlling the sodium chloride (NaCl) supply unit; And
(B-3) after stopping the supply of sodium chloride (NaCl), controlling the soft water supply unit to supply soft water;
The pH meter and the conductivity meter sends a signal for the pH and conductivity measurements of the discharge from the cation exchange resin to the control unit,
The control unit is a cation removal method, characterized in that for controlling the sodium chloride (NaCl) supply unit and the soft water supply unit in response to the signal.
The method of claim 10, wherein when the measured value of the pH meter is 7.0 ~ 7.4, cation removal method characterized in that the sodium chloride (NaCl) supply unit is controlled to stop the supply of sodium chloride (NaCl).
The method according to claim 10, wherein when the sodium chloride (NaCl) supply stops supplying sodium chloride (NaCl), the soft water supply is then controlled to start supplying soft water, and the conductivity of the soft water at which the measured value of the conductivity meter is supplied is reached. The cation removal method, characterized in that for controlling the soft water supply to stop the soft water supply.
The method of claim 12, wherein the conductivity of the soft water supplied is a cation removal method, characterized in that 30 ~ 100 dl / cm.

Images