JPH0810761A - Water softener for steam generator - Google Patents

Abstract

PURPOSE:To prevent the corrosion of a copper tube by continuously supplying a soft water into the tube without the supply of chemicals. CONSTITUTION:An electrolytic device 3 and a water softener 17 packed with a cation-exchange resin 16 are provided to a water passage for supplying water to a steam generator 22. When the water is used, an alkaline water obtained in the cathode compartment of the electrolytic device 3 is mixed in the softened water obtained in the softener 17, and an acidic water obtained in the anode compartment 6 is supplied to the softener 17 to regenerate the the cation- exchange resin 16. Consequently, the supply of resin regenerating chemicals is not needed, and a corrosion preventive soft water is continuously supplied.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water softener for use in, for example, household steam generators, humidifiers, dishwashers and the like.

[0002]

2. Description of the Related Art Generally, tap water and well water contain hardness components such as calcium and magnesium ions. When such water is used in a steam generator, scale adheres to the inside of the can, causing heat transfer. The state becomes bad. In order to deal with this problem, the following water softener has been conventionally used. This will be described with reference to FIG.

In FIG. 11, water is supplied to an electrolyzer 3 through a raw water supply pipe 1. The electrolyzer 3 is partitioned by a porous partition wall, for example, a unglazed partition wall 8 to form an anode chamber 6 and a cathode chamber 7.
Electrodes 4 and 5 are suspended in one of the polar chambers. A water softening device 17 filled with a cation exchange resin 16 is provided between the electrolyzer 3 and the steam generator 22. At the time of ion exchange, the drain valve 32 connected to the cathode water outlet pipe 10 is closed, and the water passes through the anode chamber 6 and the anode water outlet pipe 9 to soften the water filled with the cation exchange resin 16. Enter device 17. By the cation exchange resin 16, cations such as calcium and magnesium in the water are replaced with hydrogen ions, and the softened water is supplied to the steam generator 22.

At the time of regenerating the cation exchange resin, a DC voltage is applied to the electrodes 4 and 5 of the electrolyzer 3 and the obtained acidic water is supplied from the upper part of the water softener 17 to convert the cation exchange resin into a hydrogen type. Reproduce.

[0005]

However, in the above-mentioned conventional water softener, cations such as calcium and magnesium in water are replaced with hydrogen ions of the cation exchange resin, so that the pH of the softened water is up to about 4 to 5. Decrease and the free carbonic acid concentration in water increases. When the concentration of free carbonic acid increases, the corrosion of copper is promoted, and it is necessary to raise the pH of the softened water to at least 6 or more, preferably 8 to 9 in order to prevent the corrosion of the copper pipe.

As a method for raising the pH of the softened water, a method of neutralizing the softened water by mixing water with a high pH or a method of mixing water (raw water) containing cations such as calcium and magnesium. However, if the amount of softening water is too small, the pH does not rise to the target pH, and if the amount is too large, hardness components such as calcium and magnesium in the softening water are too large. The concentration becomes high and the water softening performance deteriorates. Therefore, p of mixed water
It is necessary to control H, hardness component concentration, and mixing amount, but the pH of raw water mixed and the hardness component concentration differ depending on the region.
The pH of the alkaline water obtained by electrolysis and the hardness component concentration, which fluctuate depending on the season, are also electrolyzed.
There is a problem in that it is difficult to control the pH of the mixed water and the hardness component concentration, because it largely changes depending on H, the hardness component concentration, the water temperature, and the like.

The present invention is intended to solve the above-mentioned problems.
The purpose of is to efficiently remove hardness components in water and prevent scale adhesion to the steam generator can body.
The purpose of is to prevent corrosion of the steam generator, and the third purpose is to cope with fluctuations in the concentration of raw water hardness component,
Supplying stable soft water to the steam generator.

[0008]

The water softener for a steam generator of the present invention for achieving the above object comprises, as a first means, a raw water supply pipe connected to a water pipe and a diaphragm connected to the raw water supply pipe. An electrolyzer separated into a cathode chamber and an anode chamber by a, a water softener filled with a cation exchange resin connected to the raw water supply pipe by bypass, an anode chamber of the electrolyzer and an upper part of the water softener. Acid water pipe, the alkaline water pipe that connects the cathode chamber of the electrolyzer and the mixing unit, the water softening treated water pipe that connects the water softening device and the mixing unit, and the mixing unit and the steam generator. It is connected by a supply pipe.

As a second means, a raw water supply pipe connected to a water pipe, an electrolyzer connected to the raw water supply pipe and separated into a cathode chamber and an anode chamber by a diaphragm, and connected to the raw water supply pipe by bypass. Water softener filled with cation exchange resin, an acidic water pipe connecting the anode chamber of the electrolyzer and the lower part of the water softener, and an alkaline water pipe connecting the cathode chamber of the electrolyzer and the mixing section When,
A water softening treated water pipe connecting the water softening device and the mixing section,
The mixing unit and the steam generator are connected by a mixed water supply pipe.

As a third means, a raw water supply pipe connected to a water pipe, an electrolyzer connected to the raw water supply pipe and separated into a cathode chamber and an anode chamber by a diaphragm, and an anode chamber of the electrolyzer. Acidic water pipe to connect the water softener filled with cation exchange resin, softened water pipe to connect the water softener to the mixing section, alkaline water pipe to connect the cathode chamber of the electrolyzer to the alkaline water tank , An alkaline water tank, a mixed alkaline water pipe connecting the mixing section, and the mixing section and the steam generator are connected by a mixed water supply pipe.

As a fourth means, a raw water supply pipe connected to a water pipe, an electrolyzer connected to the raw water pipe and divided into a cathode chamber and an anode chamber by a diaphragm, an anode chamber of the electrolyzer and water softening. Acid water pipe connected to the device,
An alkaline water pipe connecting the cathode chamber of the electrolyzer to the mixing unit, a water softening treated water pipe connecting the water softening unit to the mixing unit, and a mixing supply pipe connecting the mixing unit to the steam generator.

[0012]

In the water softener for the steam generator using the first means according to the present invention, the softened water obtained by substituting hydrogen ions for calcium and magnesium ions in the water with the cation exchange resin is electrically treated. By mixing the alkaline water obtained by the decomposition, it is possible to raise the pH of the treated water and prevent the corrosion of the steam generator. In addition, stable soft water can be supplied even if the raw water quality changes.

In the water softener for a steam generator according to the second means of the present invention, a water-softened water obtained by substituting hydrogen ions for calcium and magnesium ions in water with a cation exchange resin is obtained by electrolysis. By mixing the alkaline water thus obtained, it is possible to raise the pH of the treated water and prevent corrosion of the steam generator. In addition, stable soft water can be supplied even if the raw water quality changes. In addition, by performing regeneration of the cation exchange resin in a countercurrent direction with acidic water obtained by electrolysis of water, soft water can be efficiently and continuously supplied to the steam generator.

In the water softener for a steam generator according to the third means of the present invention, a cation exchange resin is used to replace calcium and magnesium ions in water with hydrogen ions. By mixing the alkaline water thus produced, the pH of the treated water can be raised and the steam generator can be prevented from being corroded. In addition, stable soft water can be supplied even if the raw water quality changes.

Further, since the alkaline water stored in the tank is used as mixed water, electrolysis at the time of water sampling can be eliminated.

In the water softener for a steam generator according to the fourth means of the present invention, raw water is mixed with softened water obtained by substituting hydrogen ions for calcium and magnesium ions in water with a cation exchange resin. As a result, the pH of the treated water can be increased and the steam generator can be prevented from corroding.
In addition, stable soft water can be supplied even if the raw water quality changes.

[0017]

EXAMPLES Softening with a cation exchange resin removes only the bicarbonate hardness component in water, and the reaction equation can be represented by the following equation.

2R-COOH + Ca (HCO ₃ ) ₂ → (R
Carbonic acid generated by the reaction of —COO) ₂ Ca + 2H ₂ CO ₃ is dissociated by a dibasic weak acid as shown in the following formula, and the pH of the softened water decreases.

[0019] ^{_{H 2 CO 3 → H + +}} HCO 3 - HCO 3 - → H + + CO 3 2- Fig general neutralization titration characteristic diagram titrated carbonate 25ml with 0.1N sodium hydroxide in 0.1N 5 shows.

According to FIG. 5, when sodium hydroxide is gradually added to the carbonic acid solution, there is a leap in pH up to around pH 6, and even if sodium hydroxide is added thereafter, the pH will increase.
The changes are slow. After that, when sodium hydroxide is added, there is a pH jump at around pH 7 to around pH 10.

Neutralization titration characteristics of the softened water treated with raw water and with alkaline water obtained in the cathode chamber during electrolysis are shown in FIGS. 6 and 7. FIG. 6 shows the result of treating water having a hardness component concentration of 50 ppm, and FIG.
The result of treating 0 ppm of water is shown.

6 and 7 show the same pH change as in FIG. 5, and if the amount of the alkaline water mixed is 10% or more of the softened water, it does not depend on the concentration (pH) of the mixed alkaline water. It is possible to set the pH after mixing to 6 or more. When raw water is mixed, it is 20% or more.

Since water is evaporated in the can of the steam generator, the liquid is concentrated (about 4 times), and a scale problem occurs. FIG. 8 shows a relationship diagram between the hardness component concentration in the concentrated liquid and the scale precipitation. From FIG. 8, scale deposition occurs when the concentration of the hardness component of the concentrated liquid becomes 120 ppm or more. Since the liquid concentration becomes four times, it is considered that the scale problem does not occur if the hardness component concentration in the water supplied to the steam generator is 30 ppm or less.

Raw water and alkaline water obtained in the cathode chamber at the time of electrolysis were mixed into the softened water, and the hardness component concentration after mixing was measured. The results are shown in FIGS. 9 and 10. FIG.
The result of treating water having a hardness component concentration of 50 ppm is shown, and FIG. 10 shows the result of treating water having a hardness component concentration of 100 ppm.

The hardness component concentration after mixing is determined by the amount of softening treated water and the hardness component concentration, and the amount of mixing water and the hardness component concentration, and can be expressed by the following equation.

B = (V * H + v * h) / (V + v) B: Concentration of hardness component after mixing [ppm] H: Concentration of hardness component of softened water [ppm] h: Concentration of hardness component of mixed water [ppm] ] V: water softening treatment amount [ml] v: mixed water amount [ml] The hardness component concentration after mixing becomes 30 ppm or less,
Although it is necessary to determine the amount of mixed water, the hardness component concentration of the mixed water largely varies depending on the pH of the raw water to be electrolyzed, the hardness component concentration, the water temperature, etc., and is difficult to control. Is considered to be 180 ppm.

When the amount of the alkaline water mixed is 20% or less with respect to the softened water, the hardness component concentration of the mixed alkaline water is not affected and the hardness component concentration after mixing can be 30 ppm or less. is there. When raw water is mixed, it is 30% or less.

(Embodiment 1) An embodiment of the present invention will be described with reference to FIG. In FIG. 1, a raw water supply pipe 1 which serves as a water channel for supplying water to a steam generator is provided with a cation exchange through a lower portion of an electrolyzer 3 and a valve 2 which stops water flow to a water softener during resin regeneration. It is connected to the upper part of the water softening device 17 filled with the resin 16. The electrolyzer 3 is divided into an anode chamber 6 and a cathode chamber 7 by a porous diaphragm 8, for example, a unglazed diaphragm.
And 5 are provided. The upper part of the anode chamber 6 is connected to the upper part of the water softener 17 through the acidic water pipe 9 and the three-way valve 11, and the upper part of the cathode chamber 7 is connected to the alkaline water pipe 1.
0 and the three-way valve 13 are connected to the mixing unit 15.

The lower part of the water softening device 17 is connected to the mixing portion 15 via a water softening treated water pipe 18, and a steam generator 22 is connected via a three-way valve 20 to a drain pipe 21 and a mixed water pipe 19. ing.

In the above structure, when water is taken, water flows through the raw water supply pipe 1, the valve 2 is opened, the three-way valve 11 is on the drain pipe 12 side, the three-way valve 13 is on the mixing section 15 side, and the three-way valve 20.
Is switched to the mixed water supply pipe 19 side, and the cation exchange resin 16 is filled with a methacrylic acid-based weakly acidic cation exchange resin, and the upper part of the water softening device 17 is separated by the diaphragm 8 into the anode chamber 6 and the cathode chamber 7. It is separately formed and supplied to the lower part of the electrolyzer 3 in which the electrodes 4 and 5 are arranged in these polar chambers.

The water supplied to the lower part of the electrolyzer 3 is
Electrolysis is performed by a DC voltage applied between the electrodes 4 and 5 to obtain acidic water in the anode chamber 6 and alkaline water in the anode chamber 7. The acidic water is drained from the drainage pipe 12 via the acidic water pipe 9 and the three-way valve 11. The alkaline water is sent to the mixing section 15 via the alkaline water pipe 10 and the three-way valve 13.

The water supplied to the upper portion of the water softening device 17 is replaced with hydrogen ions for cations such as calcium and magnesium in the water by the cation exchange resin 16, and the water softened water is supplied to the water softened water pipe 18. It is sent to the mixing section 15 via. In the mixing unit 15, 10 to 20%, preferably 14 to 16% of alkaline water is mixed with the softened water,
It is supplied to the steam generator 22.

When regenerating the cation-exchange resin, the valve 2 is closed, the three-way valve 11 is switched to the acidic water pipe 9 side, the three-way valve 13 is switched to the drainage pipe 14 side, and the three-way valve 20 is switched to the drainage pipe 21 side so that water is drained. The partition chamber 8 separates the anode chamber 6 and the cathode chamber 7 from each other, and these electrodes are supplied to the electrolyzer 3 in which the electrodes 4 and 5 are arranged. A direct current voltage is applied between both electrodes of the electrodes 4 and 5, and the acidic water obtained in the anode chamber 6 is supplied from the upper part of the water softener 17 through the acidic water pipe 9.
The cation exchange resin 16 is regenerated into a hydrogen ion type by acidic water, and the regenerated waste water is drained through the three-way valve 20 and the drain pipe 21.

As described above, in this embodiment, hardness components such as calcium and magnesium ions in the water can be removed by the cation exchange resin to prevent the scale from adhering to the can body of the steam generator, and the electrolysis of the water. By mixing the alkaline water obtained in step 1, the steam generator can be prevented from corrosion, and by regenerating the cation exchange resin with acidic water obtained by electrolysis of water, the steam generator can continuously generate soft water. Can be supplied to.

Further, by setting the mixed amount of alkaline water to 10 to 20%, preferably 14 to 16%, it is possible to supply stable soft water to the steam generator in response to the fluctuation of the concentration of raw water hardness component.

(Embodiment 2) An embodiment of the second means of the present invention will be described with reference to FIG. In FIG. 2, the raw water supply pipe 1 that serves as a water channel for supplying water to the steam generator is
It is connected to the lower part of the electrolyzer 3 and the upper part of the water softener 17 filled with the cation exchange resin 16 via a three-way valve 23. The electrolyzer 3 is divided into an anode chamber 6 and a cathode chamber 7 by a porous diaphragm 8, for example, a unglazed diaphragm, and electrodes 4 and 5 are arranged in these polar chambers, respectively. The upper part of the anode chamber 6 is connected to the lower part of the water softener 17 via an acidic water pipe 9, and the upper part of the cathode chamber 7 is connected to the mixing section 15 via an alkaline water pipe 10.

The lower portion of the water softening device 17 is connected to the mixing section 15 via the water softening treated water outlet pipe 18, and the steam generator 22 is connected to the water softening device pipe 19 via the mixed water supply pipe 19.

In the above structure, at the time of water sampling, water passes through the raw water supply pipe 1 and the three-way valve 23 is moved to the water softening device 17 side.
The three-way valve 11 is switched to the drain pipe 12 side, the three-way valve 13 is switched to the mixing section 15 side, the three-way valve 25 is opened, and the cation exchange resin 16 is filled with a methacrylic acid-based weakly acidic cation exchange resin. An anode chamber 6 and a cathode chamber 7 are separately formed by an upper portion of the device 17 and a diaphragm 8 and are supplied to a lower portion of the electrolyzer 3 in which electrodes 4 and 5 are arranged in these electrode chambers.

The water supplied to the lower part of the electrolyzer 3 is
Electrolysis is performed by a DC voltage applied between the electrodes 4 and 5 to obtain acidic water in the anode chamber 6 and alkaline water in the anode chamber 7. The acidic water is drained from the drainage pipe 12 via the acidic water pipe 9 and the three-way valve 11. The alkaline water is sent to the mixing section 15 via the alkaline water pipe 10 and the three-way valve 13.

The water supplied to the upper part of the water softening device 17 is replaced by hydrogen ions for cations such as calcium and magnesium in the water by the cation exchange resin 16, and the water softened water is fed through the water softened water pipe 18. It is sent to the mixing section 15 via the. In the mixing section 15, 10 to 20%, preferably 14 to 16% of alkaline water is mixed with the softened water,
It is supplied to the steam generator 22.

When regenerating the cation exchange resin, the three-way valve 23
To the drain pipe 24 side, the three-way valve 11 to the acidic water pipe 9 side, and the three-way valve 14 to the drain pipe 15 side, and the valve 25
Is closed to prevent water from entering the steam generator 22, and the water separates the anode chamber 6 and the cathode chamber 7 by the diaphragm 8.
It is supplied to the electrolyzer 3 in which electrodes 4 and 5 are arranged in these polar chambers. A direct current voltage is applied between both electrodes of the electrodes 4 and 5, and the acidic water obtained in the anode chamber 6 is supplied from the lower part of the water softener 17 through the acidic water pipe 9. The cation exchange resin 16 is regenerated into a hydrogen ion type by acidic water, and the regenerated waste water is drained through the three-way valve 23 and the drain pipe 24.

As described above, in this embodiment, hardness components such as calcium and magnesium ions in the water can be removed by the cation exchange resin to prevent the scale from adhering to the can body of the steam generator, and the electrolysis of the water. By mixing the alkaline water obtained in step 1, the steam generator can be prevented from corrosion, and the acidic water obtained by electrolysis of water can be used to regenerate the cation exchange resin in a countercurrent direction for efficient and continuous operation. In addition, soft water can be supplied to the steam generator.

By setting the amount of alkaline water mixed to be 10 to 20%, preferably 14 to 16%, stable soft water can be supplied to the steam generator in response to fluctuations in the concentration of raw water hardness component.

(Third Embodiment) A third embodiment of the present invention will be described with reference to FIG. In FIG. 3, the raw water supply pipe 1 serving as a water channel for supplying water to the steam generator is
The electrolyzer 3 is connected to the lower part of the electrolyzer 3, and the electrolyzer 3 is provided with a porous diaphragm 8, for example, an unglazed diaphragm.
And the cathode chamber 7, and electrodes 4 and 5 are arranged in these electrode chambers, respectively. The upper part of the anode chamber 6 is connected to the upper part of the water softening device 17 via the acidic water pipe 9, and the upper part of the cathode chamber 7 is connected to the alkaline water storage tank 26 via the alkaline water pipe 10. The water storage tank 26 is connected in an overflow manner to the drainage pipe 14, the pump 27, and the mixing section 15 via the mixed alkaline water pipe.

The lower part of the water softening device 17 is connected to the mixing section 15 via a water softening treated water outlet pipe 18 and a three-way valve 20, and to the steam generator 22 via a water mixing pipe 19.

In the above structure, the three-way valve 13 is used during water sampling.
Is switched to the acidic water pipe 9 side, and the three-way valve 20 is switched to the mixing section 15 side, so that water separates the anode chamber 6 and the cathode chamber 7 by the raw water supply pipe 1 and the diaphragm 8 and the electrodes 4 and 4 5 is supplied to the upper part of the water softening device 17 filled with a cation exchange resin 16, preferably a methacrylic acid-based weakly acidic cation exchange resin.

The water supplied to the upper part of the water softening device 17 is replaced by hydrogen ions for cations such as calcium and magnesium in the water by the cation exchange resin 16, and the water softening treated water is mixed through the pipe 18 at the mixing portion. 15, the alkaline water in the alkaline water storage tank 26 is sent to the mixing section 15 by the pump 27 through the mixed alkaline water pipe 28. In the mixing section, 10 to 20%, preferably 14 to 16% of the softened water is mixed and supplied to the steam generator 22 via a pipe.

When regenerating the cation exchange resin, the three-way valve 13
To the side of the alkaline water pipe 10 and the three-way valve 20 to the side of the drain pipe 21 so that water separates the anode chamber 6 and the cathode chamber 7 by the diaphragm 8, and the electrodes 4 and
5 is supplied to the electrolyzer 3. Electrodes 4, 5
A DC voltage is applied between the two electrodes, and the acidic water obtained in the anode chamber 6 is supplied from above the water softening device 17 via the acidic water pipe 9. The cation exchange resin 16 is regenerated into a hydrogen ion type by acidic water, and the regenerated waste water is drained through the three-way valve 20 and the drain pipe 21.

The alkaline water obtained in the cathode chamber 7 is stored in the alkaline water storage tank 26 via the alkaline water pipe 10 and is drained from the drain pipe 14 in the overflow type.

As described above, in this embodiment, hardness components such as calcium and magnesium ions in the water can be removed by the cation exchange resin to prevent the scale from adhering to the can of the steam generator, and the electrolysis of the water. By mixing the alkaline water obtained in step 1, the steam generator can be prevented from corrosion, and by regenerating the cation exchange resin with acidic water obtained by electrolysis of water, the steam generator can continuously generate soft water. Can be supplied to.

Further, by setting the mixed amount of alkaline water to 10 to 20%, preferably 14 to 16%, it is possible to supply stable soft water to the steam generator in response to fluctuations in the concentration of raw water hardness component.

Further, since the alkaline water stored in the tank is used as the mixed water, electrolysis at the time of water sampling can be eliminated.

(Embodiment 4) An embodiment of the fourth means of the present invention will be described with reference to FIG. In FIG. 4, the raw water supply pipe 1 serving as a water channel for supplying water to the steam generator is
It is connected to the lower part of the electrolyzer 3. The electrolyzer 3 is divided into an anode chamber 6 and a cathode chamber 7 by a porous diaphragm 8, for example, a unglazed diaphragm, and electrodes 4 and 5 are arranged in these polar chambers, respectively. Further, the upper part of the anode chamber 6 is connected to the upper part of the water softener 17 via the acidic water pipe 9, and the upper part of the cathode chamber 7 is connected to the drain pipe 15 and the mixing part 15 via the alkaline water pipe 10. Has been done.

The lower part of the water softening device 17 is connected to the drainage pipe 21 and the mixing portion 15 via the water softening treated water outlet pipe 18 and the three-way valve 20, and the mixing portion is connected to the steam generator 22 via the mixed water pipe 19. It is connected.

In the above structure, when water is taken, the water passes through the raw water supply pipe 1, the three-way valve 13 is connected to the alkaline water pipe 10,
Side, the three-way valve 20 is switched to the mixing section 15 side, and the diaphragm 8
The anode chamber 6 and the cathode chamber 7 are separately formed by the above, and the electrodes 4 and 5 are respectively supplied to the lower portion of the electrolyzer 3 in which the electrodes 4 and 5 are arranged. The water that passes through the anode chamber is acid water pipe 9
Is supplied to the upper part of the water softener 17 filled with a cation exchange resin 16, preferably a methacrylic acid-based weakly acidic cation exchange resin, and the cation exchange resin 16 removes cations such as calcium and magnesium in water. , Hydrogen ion is replaced, and softened water is pipe 18, three-way valve 20.
Is sent to the mixing section 15 via. The water passing through the cathode chamber is sent to the mixing section through the three-way valve 13 and the pipe 10, and the raw water is mixed with the softened water in the mixing section by 20 to 30 times.
%, Preferably 24-26%, steam generator 22
Is supplied to.

When regenerating the cation exchange resin, the three-way valve 13
Is switched to the drain pipe 15 side and the three-way valve 20 is switched to the drain pipe 21 side, and water separates the anode chamber 6 and the cathode chamber 7 by the diaphragm 8 and the electrodes 4 and 5 are respectively arranged in these electrode chambers. It is supplied to the decomposition device 3. A direct current voltage is applied between both electrodes of the electrodes 4 and 5, and the acidic water obtained in the anode chamber 6 is supplied from the upper part of the water softening device 17 through the anode water outlet pipe 9. The cation exchange resin 16 is regenerated into a hydrogen ion type by acidic water, and the regenerated waste water is drained through the three-way valve 20 and the drain pipe 21.

As described above, in this embodiment, hardness components such as calcium and magnesium ions in water are removed by the cation exchange resin to prevent the scale from adhering to the can body of the steam generator and to mix the raw water. Thus, corrosion of the steam generator can be prevented, and soft water can be continuously supplied to the steam generator by regenerating the cation exchange resin with acidic water obtained by electrolysis of water.

By setting the raw water content to be 10 to 30%, preferably 19 to 21%, it is possible to supply stable soft water to the steam generator in response to fluctuations in the raw water hardness component concentration.

Table 1 shows the total hardness and chlorine ion concentration of raw water, softened water, and water mixed with alkaline water in softened water.
Nitrite ion concentration, nitrate ion concentration, sulfate ion concentration,
The results of measuring the electric conductivity, the free carbonic acid concentration and the pH are shown.

The softened water has a lowered pH and a free carbonic acid concentration higher than that of the raw water. However, in the water mixed with alkaline water, the free carbonic acid concentration and the electric conductivity decrease, and chlorine ion, nitrite ion and nitric acid are reduced. The concentration of corrosive ions such as ions and sulfate ions is also decreasing. Also, the pH is 6 or more, and the total hardness is 30.
It is below ppm.

[0061]

As is apparent from the above description, the water softener for a steam generator of the present invention has the following effects.

According to the first means, hardness components such as calcium and magnesium ions in water can be removed by the cation exchange resin to prevent the scale from adhering to the can body of the steam generator, and the electrolysis of water can be performed. By mixing the obtained alkaline water, it is possible to prevent corrosion of the steam generator, and by regenerating the cation exchange resin with acidic water obtained by electrolysis of water,
Soft water can be continuously supplied to the steam generator.

Further, by setting the mixed amount of alkaline water to 10 to 20%, preferably 14 to 16%, it is possible to supply stable soft water to the steam generator in response to fluctuations in the concentration of raw water hardness component.

According to the second means, the cation exchange resin can remove hardness components such as calcium and magnesium ions in the water to prevent scale from adhering to the can body of the steam generator, and the electrolysis of water can be performed. Corrosion of the steam generator can be prevented by mixing the obtained alkaline water, and the cation-exchange resin can be regenerated in the countercurrent direction with the acidic water obtained by electrolysis of water, thus enabling efficient and continuous operation. , Soft water can be supplied to the steam generator.

According to the third means, the cation exchange resin can remove hardness components such as calcium and magnesium ions in the water to prevent the scale from adhering to the can body of the steam generator, and the electrolysis of water can be performed. By mixing the obtained alkaline water, it is possible to prevent corrosion of the steam generator, and by regenerating the cation exchange resin with acidic water obtained by electrolysis of water,
Soft water can be continuously supplied to the steam generator.

Further, since the alkaline water stored in the tank is used as mixed water, electrolysis at the time of water sampling can be eliminated.

According to the fourth means, the cation exchange resin can remove hardness components such as calcium and magnesium ions in the water, prevent the scale from adhering to the can body of the steam generator, and mix the raw water. With this, corrosion of the steam generator can be prevented, and soft water can be continuously supplied to the steam generator by regenerating the cation exchange resin with acidic water obtained by electrolysis of water.

By setting the raw water content to be 10 to 30%, preferably 19 to 21%, it is possible to supply stable soft water to the steam generator in response to fluctuations in the raw water hardness component concentration.

[Brief description of drawings]

FIG. 1 is a sectional view showing the configuration of a water softener for a steam generator according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing the structure of a water softener for a steam generator according to a second embodiment of the present invention.

FIG. 3 is a sectional view showing the structure of a water softener for a steam generator according to a third embodiment of the present invention.

FIG. 4 is a sectional view showing the structure of a water softener for a steam generator according to a fourth embodiment of the present invention.

FIG. 5: Neutralization titration characteristic diagram of general carbonic acid with sodium hydroxide

FIG. 6 is a titration characteristic diagram of softened treated water having a hardness component concentration of 50 ppm with alkaline water.

FIG. 7 is a titration characteristic diagram of softened treated water having a hardness component concentration of 100 ppm with alkaline water.

FIG. 8 is a diagram showing the relationship between the hardness component concentration in the concentrated liquid and scale deposition.

FIG. 9 is a characteristic diagram of hardness component concentration after mixing alkaline water into softened water having a hardness component concentration of 50 ppm.

FIG. 10 is a characteristic diagram of hardness component concentration after mixing alkaline water into softened water having a hardness component concentration of 100 ppm.

FIG. 11 is a sectional view showing the structure of a conventional water softener.

[Explanation of symbols]

 1 Raw Water Supply Pipe 3 Electrolyzer 4 Anode Chamber 5 Cathode Chamber 8 Diaphragm 9 Acidic Water Outlet Pipe 10 Alkaline Water Pipe 15 Mixing Section 16 Cation Exchange Resin 17 Water Softener 18 Softening Water Pipe 19 Mixed Water Supply Pipe 22 Steam Generator

Claims (4)

[Claims] 1. A raw water supply pipe connected to a water pipe, an electrolyzer connected to the raw water supply pipe and separated into a cathode chamber and an anode chamber by a diaphragm, and a cation connected to the raw water supply pipe by bypass. A water softener filled with exchange resin, an acidic water pipe connecting the anode chamber of the electrolyzer and the upper part of the water softener, and an alkaline water pipe connecting the cathode chamber of the electrolyzer and the mixing section. A water softener for a steam generator comprising a water softening treated water pipe connecting the water softener and the mixing section, and a mixed water supply pipe connecting the mixing section and the steam generating apparatus. 2. A raw water supply pipe connected to a water pipe, an electrolyzer connected to the raw water supply pipe and separated into a cathode chamber and an anode chamber by a diaphragm, and a cation connected to the raw water supply pipe by bypass. A water softener filled with an exchange resin, an acidic water pipe connecting the anode chamber of the electrolyzer and a lower portion of the water softener, and an alkaline water pipe connecting the cathode chamber of the electrolyzer and a mixing unit. A water softener for a steam generator comprising a water softening treated water pipe connecting the water softener and the mixing section, and a mixed water supply pipe connecting the mixing section and the steam generating apparatus. 3. A raw water supply pipe connected to a water pipe, an electrolyzer connected to the raw water supply pipe and divided into a cathode chamber and an anode chamber by a diaphragm, and a cation exchange with the anode chamber of the electrolyzer. An acidic water pipe connecting a water softening device filled with resin, a water softening treated water pipe connecting the water softening device and a mixing section, and an alkaline water pipe connecting a cathode chamber of the electrolyzer and an alkaline water tank. A water softener for a steam generator comprising the alkaline water tank, a mixed alkaline water pipe connecting the mixing section, and a mixed water supply pipe connecting the mixing section and the steam generating apparatus. 4. A raw water supply pipe connected to a water pipe, an electrolyzer connected to the raw water supply pipe and divided into a cathode chamber and an anode chamber by a diaphragm, an anode chamber and a water softening device of the electrolyzer. Acidic water pipe, an alkaline water pipe connecting the cathode chamber of the electrolyzer and the mixing unit, a water softening treated water pipe connecting the water softener and the mixing unit, the mixing unit and steam generation A water softener for a steam generator consisting of a mixed water supply pipe connected to the device.