CN105603452B - Novel high-efficient hypochlorite generator - Google Patents
Novel high-efficient hypochlorite generator Download PDFInfo
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- CN105603452B CN105603452B CN201510998379.4A CN201510998379A CN105603452B CN 105603452 B CN105603452 B CN 105603452B CN 201510998379 A CN201510998379 A CN 201510998379A CN 105603452 B CN105603452 B CN 105603452B
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
- C25B1/01—Products
- C25B1/24—Halogens or compounds thereof
- C25B1/26—Chlorine; Compounds thereof
- C25B1/265—Chlorates
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
- C25B9/17—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof
- C25B9/19—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof with diaphragms
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Abstract
The invention belongs to the field of water treatment, and particularly relates to a novel efficient sodium hypochlorite generator. The heat exchange reactor disclosed by the invention has the advantages that the electrolytic inlet liquid and the outlet liquid exchange heat mutually, the harmful temperature rise of the sodium hypochlorite solution in the outlet liquid is transferred to the beneficial temperature rise of the inlet liquid, the sodium hypochlorite solution in the outlet liquid is cooled, the stability of the sodium hypochlorite solution can be improved, the storage time of the sodium hypochlorite solution can be prolonged, the attenuation loss of the sodium hypochlorite solution is reduced, and the overall benefit is improved. The liquid electrolyte is heated, so that the conductivity of the electrolyte is improved, the current efficiency is improved, and the electrolysis power consumption is reduced.
Description
Technical Field
The invention belongs to the field of water treatment, and particularly relates to a novel efficient sodium hypochlorite generator.
Background
At present, the disinfection methods for treating tap water and sewage are generally chlorine and chlorine dioxide generators, the disinfection methods have the characteristics of potential safety hazard, difficult management and high operation cost, the sodium hypochlorite generator takes salt as a raw material, and sodium hypochlorite solution is prepared by electrolysis for disinfection. At present, a sodium chlorate generator in the market usually adopts a composite tubular electrolytic tank, a cathode and an anode are separated without a diaphragm, the temperature of the liquid outlet is high, the product is easy to attenuate, the salt conversion efficiency is low, the electric conversion efficiency is low, a byproduct chlorate is generated, and certain potential safety hazard exists in the field of drinking water disinfection.
Disclosure of Invention
In order to solve the problems, the invention provides a novel efficient sodium hypochlorite generator which has low effluent temperature, high salt conversion efficiency, high electric conversion efficiency and no byproduct chlorate, and products are not easy to attenuate.
A novel high-efficiency sodium hypochlorite generator, which comprises a water softener (19) arranged on a frame, a soft water tank (18) and a salt dissolving tank (20) respectively connected with the water softener (19), a NaOH storage tank (32), an electrolytic tank (1) and a heat exchange reactor (3),
the water softener (19) is used for reducing the raw water hardness from more than 100ppm to less than 15ppm (as CaCO)3Metering), the softened water respectively enters a salt dissolving tank (20) for preparing saturated salt water, and enters a soft water tank (18) for storage and standby;
the saturated salt water in the salt dissolving tank (20) is mixed with the soft water in the soft water tank (18) in a ratio of 1:9 under the drive of the salt water pump (5) and the drive of the soft water pump (4) to form 3 percent NaCL solutionThe solution enters a cold water inlet (3.1) of the heat exchange reactor, and then flows out from a hot water outlet (3.2) of the heat exchange reactor to enter an anode chamber (1.1) of the electrolytic cell as anolyte, and chlorine CL is generated by electrolysis2；
NaOH solution in the NaOH storage tank (32) is mixed with soft water in the soft water tank (18) under the drive of the NaOH filling pump (33) and the soft water pump (4) to form low-concentration NaOH solution (preferably 100mg/L) which enters the cathode chamber (1.2) of the electrolytic cell to serve as catholyte, and the NaOH solution (preferably 100g/L) and H produced by electrolysis2；
An ion caustic soda membrane is arranged between the anode chamber (1.1) and the cathode chamber (1.2) of the electrolytic cell (1); and the cathode and anode electrolyte of the electrolytic cell (1) is discharged from an electrolytic cell outlet (1.3) together, mixed and enters a hot water inlet (3.3) of the heat exchange reactor, and is discharged from a cold water outlet (3.4) of the heat exchange reactor after full reaction in the heat exchange reactor 3, and enters a sodium hypochlorite storage tank (25) of a storage system (24).
Preferably, the sodium hypochlorite storage tank (25) is connected with a hydrogen exhaust fan (27) for diluting hydrogen, and the hydrogen exhaust fan (27) is controlled by a switch (28).
Preferably, a temperature sensor (6), a pressure transmitter (9) and a conductivity meter (5.1) are arranged at the outlet of the brine pump (5).
Preferably, the outlet of the soft water tank (18) is provided with a soft water flow meter (10).
Preferably, the salt dissolving tank (20), the soft water tank (18) and the sodium hypochlorite storage tank (24) are respectively formed by integrally forming PE.
Preferably, the brine pump (5) is a mechanical diaphragm metering pump.
According to the application of the heat exchange reactor, the electrolytic inlet liquid and the outlet liquid are used for mutual heat exchange, the harmful temperature rise of the outlet liquid sodium hypochlorite solution is transferred to the beneficial temperature rise of the inlet liquid, the stability of the sodium hypochlorite solution can be improved by cooling the outlet liquid sodium hypochlorite solution, the storage time of the sodium hypochlorite solution can be prolonged, the attenuation loss of the sodium hypochlorite solution is reduced, and the overall benefit is improved. The liquid electrolyte is heated, so that the conductivity of the electrolyte is improved, the current efficiency is improved, and the electrolysis power consumption is reduced.
The application of the ion caustic soda film of the electrolytic cell separates electrolysis and reaction, avoids side reaction of electrolysis, improves the electrolysis efficiency, most importantly avoids the generation of harmful substances such as chlorate and the like in the side reaction, and ensures the safety of drinking water disinfection. Sodium hypochlorite solutions produced by sodium hypochlorite generators of other domestic sodium hypochlorite generator manufacturers contain a large amount of chlorate byproducts, the chlorate byproducts are added into pure water according to the effective chlorine of 3mg/L, the chlorate content is 0.5mg/L, and the chlorate content cannot be detected (the chlorate content is less than or equal to 0.7mg/L as required by the national drinking water sanitation standard).
The application of the free alkali storage tank (NaOH storage tank) and the free alkali filling pump (NaOH filling pump) improves the conductivity of the catholyte and the current efficiency, and simultaneously improves the pH of the produced sodium hypochlorite solution from 7.5 to about 10, improves the stability of the sodium hypochlorite solution, reduces the attenuation of the sodium hypochlorite solution and improves the overall economic benefit of the system.
The working principle of the novel efficient sodium hypochlorite generator is as follows: the solution containing 3% NaCL is driven by a brine pump and a soft water pump to enter the anode chamber to be electrolyzed to generate Cl2, and a small amount of NaOH is driven by a metering pump and softened water is driven by the soft water pump to enter a cathode together to be electrolyzed to generate NaOH and H2. NaOH and Cl2 were mixed at the outlet of the cell into the reactor and reacted in the reactor to form NaClO. It entered the sealed tank along with H2 while discharging H2 diluted to below 1% to the outside by injecting a large amount of air into the tank. NaClO is added to the adding point of the water treatment process in a storage tank through a metering pump.
Compared with the prior art, the invention adopts an advanced and reliable method, effectively reduces the salt consumption, the power consumption and the byproducts of the sodium hypochlorite generator, and expands the safe application field of the sodium hypochlorite generator. In addition, the invention reduces the attenuation of sodium hypochlorite solution, and has the characteristics of high integration level, simple and convenient installation, safety, reliability and full-automatic operation.
The stable range of the effective chlorine content of the sodium hypochlorite solution produced by the method is 1.0-1.2%, and the effective chlorine content of the sodium hypochlorite solution produced by the prior art is lower than 0.8%.
The salt consumption of the sodium hypochlorite produced by the method is 3.0kg in terms of effective chlorine per kilogram, and the salt consumption is more than 4.0kg in the prior art.
The power consumption of the sodium hypochlorite produced by the method is 4kwh which is equivalent to that of effective chlorine per kilogram. The prior art is above 5.5 kwh.
The attenuation of the sodium hypochlorite solution produced by the method per 24H is below 1%, and the attenuation of the sodium hypochlorite solution produced by the method is above 5% in the prior art.
Drawings
FIG. 1 is a system flow diagram of the novel high-efficiency sodium hypochlorite generator of the present invention;
Detailed Description
The present invention is further illustrated below with reference to specific examples, which are to be understood as merely illustrative and not limitative of the scope of the present invention.
As shown in fig. 1, a novel high-efficiency sodium hypochlorite generator comprises a water softener (19) arranged on a frame, a soft water tank (18) and a salt dissolving tank (20) which are respectively connected with the water softener (19), a NaOH storage tank (32), an electrolytic cell (1) and a heat exchange reactor (3), wherein the NaOH storage tank (32) and the soft water tank (18) are respectively connected with a cathode chamber (1.2) of the electrolytic cell (1) through a NaOH filling pump (33) and a soft water pump (4), the salt dissolving tank (20) and the soft water tank (18) are respectively connected with a cold water port (3.1) of the heat exchange reactor (3) through a brine pump (5) and the soft water pump (4), and are connected with an anode chamber (1.1) of the electrolytic cell (1) through a hot water outlet (3.2) of the heat exchange reactor (3); an outlet (1.3) of the electrolytic cell (1) is connected with a hot water inlet (3.3) of the heat exchange reactor (3), and a cold water outlet (3.4) of the heat exchange reactor (3) is connected with a storage tank (24) communicated with a water treatment dosing point.
The system uses tap water or other high-quality water source as raw water, and the raw water is softened by a water softener (19) to reduce the hardness of the raw water from more than 100ppm to less than 15ppm (as CaCO)3In terms of water hardness), the raw water hardness is reduced so as to prolong the service life of the electrode and reduce the pickling period. The water produced by the water softener (19) respectively enters a salt dissolving tank (20) for preparing saturated salt solution (30 percent NaCL solution) and enters a soft water tank (18) for storage and standby.
Wherein the 30% NaCL solution in the salt dissolving tank (20) is mixed with the soft water driven by the soft water pump (4) in a ratio of 1:9 under the drive of the brine pump (5) to form a 3% NaCL solution which enters the cold water inlet of the reactor (3.1) and is discharged from the hot water inlet of the reactor (3.2)The effluent enters an anode chamber (1.1) of the electrolytic cell to be used as anolyte for electrolyzing to generate chlorine CL2。
Wherein NaOH solution in a NaOH storage tank (32) is mixed with soft water driven by a NaOH filling pump (33) and a soft water pump (4) to form low-concentration NaOH solution (100mg/L), the low-concentration NaOH solution enters an electrolytic cell cathode chamber (1.2) to serve as catholyte, and NaOH (100g/L) and H are generated through electrolysis2. The effect is to improve the conductivity of catholyte, improve the current efficiency and simultaneously increase the PH of the sodium hypochlorite solution product to improve the stability of the sodium hypochlorite solution product.
And the electrolyte of the cathode and the anode of the electrolytic cell (1) is discharged from 1.3 together, mixed to enter a hot water inlet of a 3.3 reactor, and discharged from a cold water outlet of a 3.4 reactor after fully reacting in the reactor to enter a sodium hypochlorite storage tank (25).
Meanwhile, a 27-exhaust hydrogen fan blows a large amount of air into the 24-sealed storage tank, and the diluted hydrogen is safely exhausted to the outside. The sodium hypochlorite storage tank (25) is controlled by an automatic control system to feed the metering pump to a chlorination point in the water treatment process.
As described above, the present invention can achieve a sodium hypochlorite generator with high efficiency, low power consumption, low salt consumption, attenuation loss, and no by-product, and the above embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention; all equivalent changes and modifications made according to the present disclosure are intended to be covered by the scope of the claims of the present invention.
Claims (5)
1. The utility model provides a high-efficient hypochlorite generator which characterized in that: comprises a water softener (19) arranged on a frame, a soft water tank (18) and a salt dissolving tank (20) which are respectively connected with the water softener (19), a NaOH storage tank (32), an electrolytic tank (1) and a heat exchange reactor (3),
the water softener (19) is used for reducing raw water with the hardness of more than 100ppm to softened water with the hardness of less than 15ppm, and the hardness is CaCO3Respectively introducing softened water into a salt dissolving tank (20) for preparing saturated salt water, and introducing the softened water into a soft water tank (18) for storage and standby;
the saturated salt water in the salt dissolving tank (20) is driven by the brine pump (5) to react with the soft waterSoft water in a tank (18) is mixed in a ratio of 1:9 under the drive of a soft water pump (4) to form a 3% NaCl solution, the NaCl solution enters a cold water inlet (3.1) of a heat exchange reactor, the NaCl solution is discharged from a hot water outlet (3.2) of the heat exchange reactor and enters an anode chamber (1.1) of an electrolytic cell to be used as anode solution, and chlorine Cl is generated by electrolysis2；
NaOH solution in the NaOH storage tank (32) is driven by the NaOH filling pump (33) to be mixed with soft water in the soft water tank (18) under the drive of the soft water pump (4) to form mixed solution which enters the cathode chamber (1.2) of the electrolytic cell to be used as catholyte, and NaOH solution and H solution are generated through electrolysis2；
An ion caustic soda membrane is arranged between the anode chamber (1.1) and the cathode chamber (1.2) of the electrolytic cell (1); the cathode and anode electrolyte and the cathode and anode electrolysis products of the electrolytic cell (1) are discharged together from an electrolytic cell outlet (1.3), mixed and enter a hot water inlet (3.3) of the heat exchange reactor, and are discharged from a cold water outlet (3.4) of the heat exchange reactor after fully reacting in the heat exchange reactor (3) and enter a sodium hypochlorite storage tank (25) of a storage system (24);
a soft water flowmeter (10) is arranged at the outlet of the soft water tank (18);
the solution containing 3% NaCl is driven by brine pump and soft water pump to enter anode chamber for electrolysis to generate Cl2A small amount of NaOH is driven by the filling pump, softened water is driven by the soft water pump to enter the cathode chamber together for electrolysis to generate NaOH and H2(ii) a NaOH and Cl2Mixing at the outlet of the electrolytic cell, entering a reactor, and reacting in the reactor to generate NaClO; it and H2Enter a sealed storage tank together, and simultaneously inject a large amount of air into the storage tank to remove H2Diluting to below 1%, and discharging to the outside; NaClO is added to a feeding point in the water treatment process in a storage tank through a metering pump.
2. The hypochlorite generator according to claim 1, wherein: the sodium hypochlorite storage tank (25) is connected with a hydrogen exhaust fan (27) for diluting hydrogen, and the hydrogen exhaust fan (27) is controlled by a switch (28).
3. The hypochlorite generator as set forth in claim 1, wherein: and a temperature sensor (6), a pressure transmitter (9) and a conductivity meter (5.1) are arranged at the outlet of the brine pump (5).
4. The hypochlorite generator as set forth in claim 1, wherein: the salt dissolving tank (20), the soft water tank (18) and the sodium hypochlorite storage tank (25) are respectively formed by integrally forming PE, and no welding point exists on the whole body.
5. The hypochlorite generator as set forth in claim 1, wherein: the brine pump (5) is a mechanical diaphragm metering pump.
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| CN201510998379.4A CN105603452B (en) | 2015-12-25 | 2015-12-25 | Novel high-efficient hypochlorite generator |
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| CN201510998379.4A CN105603452B (en) | 2015-12-25 | 2015-12-25 | Novel high-efficient hypochlorite generator |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107604377B (en) * | 2017-10-20 | 2024-03-08 | 中国水利水电科学研究院 | Device for producing water supply sodium hypochlorite disinfectant |
| CN108560013A (en) * | 2018-01-26 | 2018-09-21 | 山东新日电气设备有限公司 | A kind of cyclic electrolysis hypochlorite generator |
| CN109778219B (en) * | 2019-02-12 | 2024-07-02 | 福建浩达智能科技股份有限公司 | Electrolytic tank assembly of sodium hypochlorite generator |
| CN109735866B (en) * | 2019-02-12 | 2024-07-02 | 福建浩达智能科技股份有限公司 | Sodium hypochlorite generator |
| CN116693036B (en) * | 2023-08-07 | 2023-10-24 | 广州新奥环境技术有限公司 | Device for water treatment and disinfection and water treatment method thereof |
| CN117228637B (en) * | 2023-11-15 | 2024-03-19 | 福建浩达智能科技股份有限公司 | Hypochlorous acid preparation device, system and method |
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| JPS5933671B2 (en) * | 1977-06-20 | 1984-08-17 | 石川島播磨重工業株式会社 | Method for producing sodium hypochlorite using brine |
| US8262872B2 (en) * | 2005-12-20 | 2012-09-11 | Ceramatec, Inc. | Cleansing agent generator and dispenser |
| US7604720B2 (en) * | 2006-04-29 | 2009-10-20 | Electrolytic Technologies Corp. | Process for the on-site production of chlorine and high strength sodium hypochlorite |
| CN201040774Y (en) * | 2007-05-23 | 2008-03-26 | 秦晓 | Modular sodium hypochlorite generator |
| KR101079470B1 (en) * | 2011-08-01 | 2011-11-03 | (주) 테크윈 | Sodium hypochlorite generator |
| CN203451629U (en) * | 2013-08-09 | 2014-02-26 | 黄志明 | Non-diaphragm-type device for preparing hypochlorous acid and sodium hypochlorite through circulating electrolysis |
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