CN107604377B - Device for producing water supply sodium hypochlorite disinfectant - Google Patents
Device for producing water supply sodium hypochlorite disinfectant Download PDFInfo
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- CN107604377B CN107604377B CN201710982108.9A CN201710982108A CN107604377B CN 107604377 B CN107604377 B CN 107604377B CN 201710982108 A CN201710982108 A CN 201710982108A CN 107604377 B CN107604377 B CN 107604377B
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Abstract
The invention provides a device for producing water supply sodium hypochlorite disinfectant, which comprises a water softener, wherein the water softener is connected with a brine preparation tank, the brine preparation tank is connected with a high-level brine tank, the high-level brine tank is connected with an anode chamber of an ion membrane electrolytic cell with a diversion weir, and a cathode chamber of the ion membrane electrolytic cell is connected with a high-level alkali liquor tank; the anode chamber generates light brine and chlorine, and the cathode chamber generates hydrogen and sodium hydroxide; the anode chamber is connected with a gas-liquid separator, the gas-liquid separator is connected with a light brine circulation tank with a grating plate, and the light brine circulation tank is connected with a brine preparation tank; the high-order alkali liquor tank, the gas-liquid separator and the dilute brine circulating tank are connected with a chlorine negative pressure absorption and sodium hypochlorite circulating reaction system, and sodium hypochlorite solution is generated through the chlorine negative pressure absorption and sodium hypochlorite circulating reaction system. After the sodium hypochlorite disinfectant produced by the invention is added into a water body, the indexes such as the pH value, the total dissolved solids and the like of the water are changed little, the generated disinfection byproducts are few, and meanwhile, the operation cost is low, and the maintenance and the management are convenient.
Description
Technical Field
The invention belongs to the technical field of small and medium-sized water supply engineering, and particularly relates to a device for producing water supply sodium hypochlorite disinfectant.
Background
In urban water supply engineering in China, liquid chlorine disinfection is the most mature disinfection technology, but the safety requirement is high, the public security department needs to record before use, the medium and small water supply engineering does not have the use condition, and the applicable disinfection modes mainly comprise sodium hypochlorite, chlorine dioxide, ultraviolet rays and ozone disinfection. Ozone and ultraviolet sterilization have no continuous sterilization effect, and can only be applied to small projects with shorter pipe networks; raw materials needed by chlorine dioxide disinfection are not easy to purchase, and the running cost is high; compared with other disinfection methods, the sodium hypochlorite disinfection method has the advantages of convenient raw material purchase, high safety, good continuous disinfection effect and the like. However, the commercial sodium hypochlorite disinfectant has the problems of high cost, high pH value, easy blockage and corrosion of a dosing pump during dosing, large influence on indexes such as pH value, total dissolved solids and the like in water body and the like when being used for water supply disinfection. For this purpose, devices for producing sodium hypochlorite solutions, i.e. sodium hypochlorite generators, which occur on site, have been developed and used.
The sodium hypochlorite generator comprises a diaphragm-free sodium hypochlorite generator and a diaphragm sodium hypochlorite generator. The traditional diaphragm-free sodium hypochlorite generator has the problems of low effective chlorine concentration, high salt consumption, high power consumption, high running cost and the like. In recent years, researchers introduce the ionic membrane electrolysis technology in the chlor-alkali industry into the field of drinking water disinfection, so that the effective chlorine concentration is improved, and the alternating current power consumption, the salt consumption and the running cost are reduced.
In the prior art, although the technology of producing chlorine by using ion membrane electrolysis is introduced into the technical field of drinking water disinfection, the process maturity is seriously insufficient, a series of problems of protection of an ion membrane, gas-liquid separation, chlorine absorption and the like are not solved, the current efficiency and the like of equipment are more reduced when the equipment is used for a long time, the concentration of residual salt and byproduct chlorate produced in the production disinfectant is higher, and the salt consumption and the electricity consumption level of the equipment are required to be optimized. As is known, the disinfection equipment of small and medium water supply engineering cannot replicate a set of complex processes of secondary refining of brine, dechlorination of light brine and the like in the chlor-alkali industry, and the problems of current efficiency reduction and power consumption increase caused by ion membrane pollution and bubbling due to calcium and magnesium ions, membrane vibration and the like existing in the brine are solved. In addition, how to effectively remove the chlorine in the liquid discharged from the anode chamber of the electrolytic cell, and prevent the residual chlorine in the circulating brine from entering the brine preparation box; how the non-electrolyzed brine is reused, the waste of the salt is reduced, and the salt content of the sodium hypochlorite solution entering the final finished product is reduced; the problem that how to absorb chlorine into sodium hypochlorite by alkali liquor effectively and avoid the generation of sodium hypochlorite to decompose again caused by local overchlorination needs to be solved.
Disclosure of Invention
The invention aims to provide a device for producing high-quality water supply sodium hypochlorite disinfectant, which has the advantages of small index changes of pH value, total dissolved solids and the like of water after the sodium hypochlorite disinfectant is added into a water body, few disinfection byproducts, low operation cost and convenient maintenance and management.
The invention provides a device for producing water supply sodium hypochlorite disinfectant, which comprises a water softener for softening inflow water, wherein the water softener is connected with a brine preparation tank, the brine preparation tank is connected with a high-level brine tank, saturated brine is fed into the high-level brine tank through a built-in salt absorber, the high-level brine tank is connected with a natural circulation ion membrane electrolytic tank with a diversion weir and is used for pressing the saturated brine into an anode chamber of the ion membrane electrolytic tank through the height difference between the high-level brine tank and the ion membrane electrolytic tank, the ion membrane electrolytic tank is connected with a high-level alkali liquor tank, and sodium hydroxide solution in the high-level alkali liquor tank flows into a cathode chamber of the ion membrane electrolytic tank by gravity;
the anode chamber generates light brine and chlorine, and the cathode chamber generates hydrogen and sodium hydroxide; the sodium hydroxide solution in the cathode chamber circulates with the sodium hydroxide solution in the high-order alkali liquor tank through the ascending effect of hydrogen; the anode chamber is connected with the gas-liquid separator, the gas-liquid separator is connected with the fresh brine circulation tank with the grating plate, the fresh brine circulation tank is connected with the brine preparation tank, the fresh brine in the fresh brine circulation tank is recovered through the brine preparation tank, the fresh brine extrudes the chlorine-containing fresh brine through the net structure on the grating plate of the fresh brine circulation tank, and the residual chlorine in the fresh brine is removed;
the high-order alkali liquor box, the gas-liquid separator and the dilute brine circulating tank are connected with a chlorine negative pressure absorption and sodium hypochlorite circulating reaction system, and chlorine separated by the gas-liquid separator and removed by the dilute brine circulating tank reacts with sodium hydroxide solution to generate sodium hypochlorite solution through the chlorine negative pressure absorption and sodium hypochlorite circulating reaction system.
Further, the chlorine negative pressure absorption and sodium hypochlorite circulating reaction system comprises a sodium hypochlorite reaction device, an alkali liquor circulating pump and a water injector;
the sodium hypochlorite reaction device is connected with the high-level alkali liquor box, and the position of the high-level alkali liquor box is higher than that of the sodium hypochlorite reaction device, so that sodium hydroxide solution in the high-level alkali liquor box can automatically overflow into the sodium hypochlorite reaction device;
the sodium hypochlorite reaction device is connected with a sodium hydroxide solution circulating pipeline, and the sodium hydroxide solution circulating pipeline enables the sodium hydroxide solution in the sodium hypochlorite reaction device to continuously circulate through an alkali liquor circulating pump;
the sodium hydroxide solution circulating pipeline is in a vacuum state in the pipeline through the water injector, and the sodium hypochlorite solution is formed by the reaction of chlorine absorbed by negative pressure and the sodium hydroxide solution.
Further, the sodium hydroxide solution circulating pipeline is provided with a heat exchanger, and the heat exchanger is connected with the high-order alkali liquor tank and is used for transferring heat generated in the reaction process to the high-order alkali liquor tank.
Further, the sodium hypochlorite reaction device is connected with a finished sodium hypochlorite solution tank for containing sodium hypochlorite solution.
Further, the high-order alkali liquor tank is connected with a replenishing pump for replenishing softened water.
Further, the high-order alkali liquor box is also connected with a fan for discharging hydrogen in the high-order alkali liquor box.
Further, the salt absorber is connected with the high-level brine tank through a Y-shaped filter and a salt supplementing water pump.
Further, the anode of the anode chamber and the cathode of the cathode chamber are both in a net structure, the anode is coated with an oxide coating of titanium or ruthenium, and the anode is coated with an oxide coating of nickel.
Further, the ion membrane of the ion membrane electrolytic tank adopts a single-layer sodium perfluor sulfonate ion exchange membrane.
Compared with the prior art, the invention has the beneficial effects that:
(1) The diversion weirs at the anode and cathode inlets and outlets of the electrolytic cell can ensure that electrolyte is uniformly distributed in the electrolytic cell, thereby ensuring that the overall electrolytic current efficiency of the electrolytic cell is maintained at a higher level.
(2) The anolyte (saturated saline solution) and the catholyte (alkaline solution) adopt a natural circulation mode by gravity and flow into the electrolysis chamber automatically, and respectively enter the anode chamber and the cathode chamber, so that the vibration of the ionic membrane caused by the forced circulation mode of the electrolyte pumped by a metering pump can be avoided, the damage of the membrane is effectively avoided, and the service life of the ionic membrane is prolonged.
(3) After the chlorine in the dilute brine flowing out of the anode of the electrolytic tank is fully removed, the secondary utilization of the non-electrolytic salt can be realized, the salt consumption of the electrolytic device is reduced, and meanwhile, the salt is prevented from entering a finished sodium hypochlorite solution, so that the added value of the total solid value (TDS) of the solubility of the water body can be reduced.
(4) The negative pressure is adopted to absorb the chlorine, the chlorine in the anode chamber of the electrolytic cell is not easy to leak, the system safety is high, the chlorine and the alkali liquor can be fully mixed, and the reaction efficiency is high. Can solve among the prior art and let in the chlorine pipe in sodium hypochlorite solution jar, adopt the positive pressure absorption chlorine, lead to chlorine unable evenly distributed in alkali lye, reaction efficiency is low and near the chlorine pipe export because of chlorine concentration is high very easily appear local overchloridizing and lead to the problem of sodium hypochlorite resolubilization that generates.
(5) The single-layer sodium perfluorosulfonate ion exchange membrane has better chemical stability and strong corrosion resistance than the perfluorocarboxylic acid membrane and perfluorocarboxylic acid/sulfonic acid composite membrane in the prior art; meanwhile, due to the single-layer film, the interlayer peeling or bubble generation problem when the composite film is adopted is avoided.
(6) No continuous alkali liquor supply is needed, and the method is used for absorbing the chlorine generated by the electrolytic tank, so that the economic cost is low.
(7) The heat generated by the reaction of the chlorine and the sodium hydroxide (alkali liquor) is effectively utilized to heat the alkali liquor, the complexity of the system and the energy consumption of the system can be reduced while the current efficiency is ensured, and a heating device is not required to be arranged at the electrolytic tank of the sodium hypochlorite generating device, so that the temperature of the cathode alkali liquor is kept at a certain level.
Drawings
FIG. 1 is a schematic diagram of an apparatus for producing a water supply sodium hypochlorite disinfectant according to the present invention;
FIG. 2 is a schematic diagram of an ion membrane electrolyzer with a diversion weir for a device for producing water supply sodium hypochlorite disinfectant according to the present invention.
Reference numerals in the drawings:
1-a water softener; 2-a brine preparation tank; a 3-Y filter; 4-a dilute brine circulation tank with grid plates; 5-a gas-liquid separator; 6-a natural circulation ionic membrane electrolytic cell with a diversion weir; 61-a diversion weir; 7-a high-level brine tank; 8-a high alkali liquor tank; 9-alkali liquor heating jacket; 10-a hydrogen blower; 11-sodium hypochlorite reaction unit; 12-a heat exchanger; 13-a water jet; 14-a finished sodium hypochlorite solution tank; 15-a water supplementing pump; 16-a salt supplementing water pump; 17-alkali liquor circulating pump.
Detailed Description
The present invention will be described in detail below with reference to the embodiments shown in the drawings, but it should be understood that the embodiments are not limited to the present invention, and functional, method, or structural equivalents and alternatives according to the embodiments are within the scope of protection of the present invention by those skilled in the art.
Referring to fig. 1 and 2, the present embodiment provides a device for producing water supply sodium hypochlorite disinfectant, comprising a water softener 1 for softening water, wherein the water softener 1 is connected with a brine preparation tank 2, the brine preparation tank 2 is connected with a high-level brine tank 7, the brine preparation tank 2 sends saturated brine into the high-level brine tank 7 through a built-in salt absorber, the high-level brine tank 7 is connected with a natural circulation ionic membrane electrolytic tank 6 with a diversion weir, the device is used for pressing the saturated brine into an anode chamber of the ionic membrane electrolytic tank through the height difference between the high-level brine tank 7 and the ionic membrane electrolytic tank, the ionic membrane electrolytic tank is connected with a high-level alkali liquor tank 8, and sodium hydroxide solution in the high-level alkali liquor tank 8 flows into a cathode chamber of the ionic membrane electrolytic tank by gravity;
the anode chamber generates light brine and chlorine, and the cathode chamber generates hydrogen and sodium hydroxide; the sodium hydroxide solution in the cathode chamber circulates with the sodium hydroxide solution in the high-order alkali liquor tank through the ascending effect of hydrogen; the anode chamber is connected with a gas-liquid separator 5, the light brine and the chlorine are separated through water falling and gas rising, the gas-liquid separator 5 is connected with a light brine circulating tank 4 with a grating plate, the light brine circulating tank is connected with a brine preparation tank 2, the light brine in the light brine circulating tank is recovered through the brine preparation tank 2, the light brine extrudes chlorine-containing light brine through a net structure on the grating plate of the light brine circulating tank, and the residual chlorine in the light brine is removed;
the high-order alkali liquor box 8, the gas-liquid separator 5 and the dilute brine circulating tank 4 with grating plates are connected with a chlorine negative pressure absorption and sodium hypochlorite circulating reaction system, and chlorine separated by the gas-liquid separator and the chlorine removed by the dilute brine circulating tank react with sodium hydroxide solution to generate sodium hypochlorite solution through the chlorine negative pressure absorption and sodium hypochlorite circulating reaction system.
In the embodiment, the chlorine negative pressure absorption and sodium hypochlorite circulating reaction system comprises a sodium hypochlorite reaction device 11, an alkali liquor circulating pump 17 and a water injector 13;
the sodium hypochlorite reaction device 11 is connected with the high-level alkali liquor box 8, and the position of the high-level alkali liquor box 8 is higher than that of the sodium hypochlorite reaction device 11, so that sodium hydroxide solution in the high-level alkali liquor box 8 can automatically overflow into the sodium hypochlorite reaction device 11;
the sodium hypochlorite reaction device 11 is connected with a sodium hydroxide solution circulating pipeline, and the sodium hydroxide solution circulating pipeline enables the sodium hydroxide solution in the sodium hypochlorite reaction device 11 to continuously circulate through an alkali liquor circulating pump 17;
the sodium hydroxide solution circulating pipeline is in a vacuum state in the pipeline through the water injector 13, and chlorine is absorbed by virtue of negative pressure to react with sodium hydroxide solution to form sodium hypochlorite solution.
In this embodiment, the sodium hydroxide solution circulation line is provided with a heat exchanger 12, and the heat exchanger 12 is connected to the high-level lye tank 8 for transferring heat generated in the reaction process to the high-level lye tank 8.
In this embodiment, a finished sodium hypochlorite solution tank 14 for containing a sodium hypochlorite solution is connected to the sodium hypochlorite reaction device 11.
In this embodiment, the high-level lye tank 8 is connected with a replenishment pump 15 for replenishing demineralized water.
In the embodiment, the high-level alkali liquor tank 8 is also connected with a hydrogen fan 10 for discharging hydrogen in the high-level alkali liquor tank.
In this embodiment, the salt absorber is connected to the high-level brine tank 7 through the Y-filter 3 and the brine replenishment pump 16.
In this embodiment, the anode of the anode chamber and the cathode of the cathode chamber are both mesh structures, the anode is coated with an oxide coating of titanium or ruthenium, and the anode is coated with an oxide coating of nickel.
In this example, the ion membrane of the ion membrane electrolyzer is a single layer sodium perfluorosulfonate ion exchange membrane.
The device for producing water supply sodium hypochlorite disinfectant provided by the embodiment has the following technical effects:
1) Saturated brine is prepared by water produced by the water softener, so that the deposition of calcium and magnesium ions on the ion membrane is reduced.
2) The ionic membrane electrolytic tank with the diversion weir is adopted to ensure that electrolyte can be uniformly distributed in the electrolytic chamber, so that the overlarge concentration of local electrolyte is avoided, and the current efficiency and the stable equipment performance are ensured.
3) By adopting the electrolyte circulation mode of natural circulation, the vibration of the ion membrane under the condition of forced circulation of the pump is avoided, and the service life of the ion membrane is prolonged.
4) By adopting the perfluorosulfonic acid ion exchange membrane, the problem of ion membrane foaming which is easy to occur under the condition of adopting the perfluorosulfonic acid carboxylic acid composite membrane is avoided, and the service life of the ion membrane is prolonged.
4) The production process safety can be ensured and the leakage of chlorine can be prevented by absorbing the chlorine through negative pressure.
5) Through the gas-liquid separator and the dilute brine circulating tank with the grid plate inside, the effective separation of the chlorine and the non-electrolyzed dilute brine in the anode chamber is realized.
6) The circulation of the catholyte is realized by the arrangement of the high-order lye tank and the gas lifting effect.
7) Through the sodium hypochlorite circulation reaction system formed by the water injector, the alkali liquor circulating pump and the sodium hypochlorite reaction device, the effective absorption of chlorine is realized, and the sodium hypochlorite decomposition caused by local overchlorination can be avoided.
The present invention will be described in further detail below.
The device takes a natural circulation ionic membrane electrolytic tank 6 with a diversion weir as a core, and also comprises a water inlet distribution system, an anode chlorine separation and brine circulation system, a cathode alkali liquor circulation system, a chlorine negative pressure absorption and sodium hypochlorite circulation reaction system and a circulating water system.
The electrolyte circulation conditions of the anode and the cathode of the ionic membrane are specifically as follows:
after tap water passes through the water softener 1, the concentration of calcium and magnesium ions reaches a level of a few mg/L, the tap water flows into the brine preparation box 2, meanwhile, solid iodine-free edible salt (the purity of sodium chloride can reach more than 98.5%) is added into the brine preparation box 2, and certain undissolved salt is ensured in the brine preparation box 2, so that the saturated state of the brine in the brine preparation box 2 is ensured, the saturated brine is sucked into the high-level brine tank 7 through the salt sucking device arranged in the brine preparation box 2, and the saturated brine is pressed into the natural circulation ion membrane electrolytic tank 6 with the flow guiding weir by utilizing the height difference between the high-level brine tank 7 and the natural circulation ion membrane electrolytic tank 6 with the flow guiding weir.
The ion membrane divides the electrolytic tank into an anode chamber and a cathode chamber, a diversion weir 61 arranged at the inlet of the electrolyte ensures that the electrolyte is uniformly distributed in the anode chamber and the cathode chamber respectively, the anolyte is saturated saline solution, the catholyte is alkaline solution (namely sodium hydroxide solution), the anode and the cathode both adopt a reticular structure, and oxide coatings such as titanium, ruthenium and the like are coated on the anode screen; the anode mesh is coated with a nickel oxide coating. After the energization, water (H) 2 O) discharge on cathode surface to generate hydrogen (H) 2 ) Sodium ions (Na) + ) Then the hydrogen passes through the ion membrane and enters the cathode chamber from the anode chamber to be hydrolyzed with the cathode chamber to generate hydrogenOxygen radical ion (OH) - ) Combining to generate sodium hydroxide (NaOH); in the anode chamber, chloride ions (Cl) formed after dissolution of salt - ) Then discharge is carried out on the anode surface to generate chlorine (Cl) 2 )。
The electrolyzed fresh brine and the chlorine are led out from the anode chamber and flow through the gas-liquid separator 5, the separation of the chlorine and the fresh brine is realized by means of water falling and gas rising, and then the chlorine-containing fresh brine flows through the fresh brine circulating tank 4 with the grid plate, the net structure on the grid plate can further squeeze the chlorine-containing fresh brine, so that residual chlorine is fully removed from the fresh brine, the chlorine removed from the gas-liquid separator 5 in the fresh brine circulating tank 4 with the grid plate enters a chlorine negative pressure absorption and sodium hypochlorite circulating reaction system together, and the fresh brine flows into the brine preparing tank 2 to realize the recycling of the non-electrolyzed salt.
The alkali liquor in the high-level alkali liquor box 8 flows into the cathode chamber of the natural circulation ionic membrane electrolytic tank 6 with the diversion weir by gravity, and hydrogen (H) generated by electrolysis on the surface of the cathode 2 ) The rising effect can promote the circulation of the catholyte, hydrogen (H) 2 ) Finally, the air is blown out of the room through the hydrogen fan 10 and discharged out of the system. When the cathode alkali liquor circulation system is started, 30% alkali liquor is required to be added into the cathode alkali liquor circulation system, subsequent addition is not required, and only softened water is required to be supplemented into the cathode alkali liquor circulation system by the water supplementing pump 15 when the liquid level in the high-level alkali liquor tank 8 is reduced to a certain degree. A communicating pipe is arranged between the high-level alkali liquor box 8 and the sodium hypochlorite reaction device 11, the opening position of the communicating pipe in the high-level alkali liquor box 8 is higher than the position of the communicating pipe in the sodium hypochlorite reaction device 11, alkali liquor in the high-level alkali liquor box 8 can automatically overflow into the sodium hypochlorite reaction device 11, and the alkali liquor overflowed into the sodium hypochlorite reaction device 11 is used for absorbing chlorine removed from the light brine circulation tank 4 with grid plates and the gas-liquid separator 5.
The working process of the chlorine negative pressure absorption and sodium hypochlorite circulating reaction system is as follows:
the alkali liquor circulation pump 17 in the sodium hypochlorite reaction device 11 provides power to enable alkali liquor in the sodium hypochlorite reaction device 11 to circulate continuously, when the alkali liquor passes through the water jet 13, the water jet 13 enables a vacuum state to appear in a pipeline, chlorine is absorbed by virtue of negative pressure, the chlorine and the alkali liquor are fully mixed and react to generate sodium hypochlorite, after a certain period of circulation reaction, the formed sodium hypochlorite solution is led into the finished sodium hypochlorite solution tank 14, and the formed sodium hypochlorite solution can be used for disinfection of water supply engineering. The heat generated by the sodium hypochlorite circulating reaction system is transferred to the high-level alkali liquor box 8 through the heat exchanger 12, so that alkali liquor in the high-level alkali liquor box 8 can be heated, and the bath temperature of the natural circulating ionic membrane electrolytic bath 6 with the diversion weir is improved.
The concentration of the generated sodium hypochlorite solution and the concentration of the effective chlorine can be improved by more than 3 times compared with that of the sodium hypochlorite generator without a diaphragm. Compared with the commercial sodium hypochlorite solution, the pH value, the total dissolved solids, the sodium ions and the chloride ion concentration are changed slightly after the commercial sodium hypochlorite solution is added into water, and the concentration of trihalomethane generated as a disinfection byproduct can be reduced by more than 50 percent. In addition, the device can effectively prolong the service life of the ionic membrane, improve the chlorine removal efficiency of the anode chamber of the electrolytic cell and the reaction efficiency of the chlorine in the anode chamber and the alkali liquor in the cathode chamber, and further reduce the running cost.
According to the sodium hypochlorite disinfectant production device provided by the embodiment, the effective chlorine adding amount of 2mg/L is added into the water body (the TDS content of raw water is about 267 mg/L), the TDS content of the water body is basically unchanged, the TDS content of the water body is increased by 10% and 25% respectively by the diaphragm-free and commodity sodium hypochlorite solution adding of the same adding amount, and after the sodium hypochlorite disinfectant produced by the device is added into the water body, the trihalomethane content of a disinfection byproduct is reduced by 60% compared with the value of the commodity sodium hypochlorite solution.
The above list of detailed descriptions is only specific to practical embodiments of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent embodiments or modifications that do not depart from the spirit of the present invention should be included in the scope of the present invention.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (7)
1. The device for producing the water supply sodium hypochlorite disinfectant is characterized by comprising a water softener for softening water, wherein the water softener is connected with a brine preparation tank, the brine preparation tank is connected with a high-level brine tank, saturated brine is fed into the high-level brine tank through a built-in brine absorber, the high-level brine tank is connected with an anode chamber of a natural circulation ion membrane electrolyzer with a diversion weir and is used for pressing the saturated brine into the anode chamber of the ion membrane electrolyzer through the height difference between the high-level brine tank and the ion membrane electrolyzer, a cathode chamber of the ion membrane electrolyzer is connected with a high-level alkali liquor tank, and sodium hydroxide solution in the high-level alkali liquor tank flows into the cathode chamber of the ion membrane electrolyzer by gravity;
the anode chamber generates light brine and chlorine, and the cathode chamber generates hydrogen and sodium hydroxide; the sodium hydroxide solution in the cathode chamber circulates with the sodium hydroxide solution in the high-order alkali liquor tank through the ascending effect of hydrogen; the anode chamber is connected with the gas-liquid separator, the gas-liquid separator is connected with the fresh brine circulation tank with the grating plate, the fresh brine circulation tank is connected with the brine preparation tank, the fresh brine in the fresh brine circulation tank is recovered through the brine preparation tank, the fresh brine is extruded with chlorine-containing fresh brine through a net structure on the grating plate of the fresh brine circulation tank, and residual chlorine in the fresh brine is removed;
the high-order alkali liquor box, the gas-liquid separator and the dilute brine circulating tank are connected with a chlorine negative pressure absorption and sodium hypochlorite circulating reaction system, and chlorine gas separated by the gas-liquid separator and chlorine gas removed by the dilute brine circulating tank react with sodium hydroxide solution to generate sodium hypochlorite solution through the chlorine negative pressure absorption and sodium hypochlorite circulating reaction system;
the chlorine negative pressure absorption and sodium hypochlorite circulating reaction system comprises a sodium hypochlorite reaction device, an alkali liquor circulating pump and a water injector;
the sodium hypochlorite reaction device is connected with the high-level alkali liquor box, and the position of the high-level alkali liquor box is higher than that of the sodium hypochlorite reaction device, so that sodium hydroxide solution in the high-level alkali liquor box can automatically overflow into the sodium hypochlorite reaction device;
the sodium hypochlorite reaction device is connected with a sodium hydroxide solution circulating pipeline, and the sodium hydroxide solution circulating pipeline enables sodium hydroxide solution in the sodium hypochlorite reaction device to continuously circulate through the alkali liquor circulating pump;
the sodium hydroxide solution circulating pipeline is in a vacuum state in the pipeline through the water injector, and chlorine is absorbed by virtue of negative pressure to react with sodium hydroxide solution to form sodium hypochlorite solution;
the ion membrane of the ion membrane electrolytic tank adopts a single-layer sodium perfluor sulfonate ion exchange membrane.
2. The apparatus for producing a water supply sodium hypochlorite disinfectant according to claim 1, wherein the sodium hydroxide solution circulation line is provided with a heat exchanger connected to the high-level lye tank for transferring heat generated during the reaction to the high-level lye tank.
3. The apparatus for producing water supply sodium hypochlorite disinfectant as claimed in claim 1, wherein said sodium hypochlorite reaction means is connected to a finished sodium hypochlorite solution tank for containing sodium hypochlorite solution.
4. The apparatus for producing water supply sodium hypochlorite disinfectant according to claim 1, wherein the high level lye tank is connected with a supply pump for supplying softened water.
5. The apparatus for producing water supply sodium hypochlorite disinfectant as set forth in claim 1, wherein the high level lye tank is further connected with a blower for exhausting hydrogen gas from the high level lye tank.
6. The apparatus for producing water supply sodium hypochlorite disinfectant as set forth in claim 1, wherein said salt aspirator is connected to a high-level brine tank through a Y-filter and a brine replenishment pump.
7. The apparatus for producing a water supply sodium hypochlorite disinfectant according to claim 1, wherein the anode of the anode chamber and the cathode of the cathode chamber are both in a net structure, the anode is coated with an oxide coating of titanium or ruthenium, and the anode is coated with an oxide coating of nickel.
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| CN108505061A (en) * | 2018-07-03 | 2018-09-07 | 中国水利水电科学研究院 | A kind of high-concentrated sodium hypochlorite generator |
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| CN111334816A (en) * | 2020-04-20 | 2020-06-26 | 浙江高成绿能科技有限公司 | Method for preparing hypochlorous acid water by electrolysis |
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