CN114988450A - Water treatment centralized station system - Google Patents
Water treatment centralized station system Download PDFInfo
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- CN114988450A CN114988450A CN202210691334.2A CN202210691334A CN114988450A CN 114988450 A CN114988450 A CN 114988450A CN 202210691334 A CN202210691334 A CN 202210691334A CN 114988450 A CN114988450 A CN 114988450A
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/48—Halides, with or without other cations besides aluminium
- C01F7/56—Chlorides
- C01F7/57—Basic aluminium chlorides, e.g. polyaluminium chlorides
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B11/00—Oxides or oxyacids of halogens; Salts thereof
- C01B11/04—Hypochlorous acid
- C01B11/06—Hypochlorites
- C01B11/062—Hypochlorites of alkali metals
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B7/00—Halogens; Halogen acids
- C01B7/01—Chlorine; Hydrogen chloride
- C01B7/012—Preparation of hydrogen chloride from the elements
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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
- C25B1/02—Hydrogen or oxygen
- C25B1/04—Hydrogen or oxygen by electrolysis of water
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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
- C25B1/34—Simultaneous production of alkali metal hydroxides and chlorine, oxyacids or salts of chlorine, e.g. by chlor-alkali electrolysis
- C25B1/46—Simultaneous production of alkali metal hydroxides and chlorine, oxyacids or salts of chlorine, e.g. by chlor-alkali electrolysis in diaphragm cells
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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
- C25B9/60—Constructional parts of cells
- C25B9/65—Means for supplying current; Electrode connections; Electric inter-cell connections
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
Abstract
The invention relates to a water treatment centralized station system, which comprises a brine and pure water treatment unit, a sodium hydroxide unit, an electrolysis unit, a sodium hypochlorite synthesis unit, a polyaluminium chloride synthesis unit, a sodium hypochlorite management unit, a polyaluminium chloride management unit and other units and an automatic control system. Pure water produced by the brine and pure water treatment unit is used for a sodium hydroxide unit to dissolve and supplement sodium hydroxide, and a high-temperature sodium hydroxide solution enters an electrolytic cell ionic membrane cathode unit to be electrolyzed to generate high-concentration sodium hydroxide, and the high-concentration sodium hydroxide is subjected to heat exchange and dilution in a sodium hydroxide unit and then is synthesized with chlorine produced by an anode of an electrolytic cell of the electrolytic cell unit in a sodium hypochlorite synthesis unit to obtain a finished sodium hypochlorite solution. And hydrogen and chlorine generated by the electrolysis unit are synthesized by the HCl synthesis unit and then enter the polyaluminium chloride synthesis unit to generate high-quality polyaluminium chloride solution. The invention improves the production efficiency, reduces the energy consumption and solves the problem of a transportation supply chain.
Description
Technical Field
The invention relates to the technical field of tap water and sewage treatment, in particular to a water treatment centralized station system.
Background
In the process of treating tap water and sewage, disinfection and purification are necessary links. Almost most of the disinfection and purification processes are carried out by chemical agents such as chlorine-containing disinfectants, polyaluminium chloride and the like. In recent years, some small and medium-sized waterworks, sewage plants and sewage stations begin to use a diaphragm-free method to prepare sodium hypochlorite on site for disinfection, and large waterworks and sewage plants mainly purchase liquid chlorine or finished sodium hypochlorite; various waterworks, sewage plants and sewage plants are treated by purchasing water purifying agents (polyaluminium chloride and polyferric chloride).
The problems of various potential safety hazards such as chlorine gas and sodium hypochlorite leakage exist in water plants and sewage plants; the problem that a byproduct-chlorate can be formed by a finished product sodium hypochlorite solution stored for a long time; the diaphragm-free sodium hypochlorite generator has the problems of complex equipment management, high purchasing cost, no overhauling capability of most waterworks, sewage plants and sewage stations, complete dependence on equipment suppliers and the like; the large-scale sodium hypochlorite equipment is required to be selected for large-scale water plants and sewage plants, the investment scale is huge, the maintenance and management cost is very high, the economy is very low, the practical problems that the corresponding scheme for byproducts such as chlorate and the like is insufficient and the like are solved, the product quality is uneven in the market, and the selection difficulty is increased.
At present, whether the finished sodium hypochlorite and polyaluminum chloride chemical agents are purchased or about 0.8 percent of the finished sodium hypochlorite solution is prepared on site, the support of suppliers is relied on, and the environmental influence of policy industry is huge.
Disclosure of Invention
The present invention is directed to a water treatment central station system that addresses at least some of the deficiencies in the prior art.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions: a water treatment centralized station system comprises a brine and pure water treatment unit, a sodium hydroxide unit, an electrolysis unit, a sodium hypochlorite synthesis unit, a polyaluminium chloride synthesis unit, a sodium hypochlorite management unit, a polyaluminium chloride management unit and the like, and an automatic control system, wherein pure water produced by the brine and pure water treatment unit is used for dissolving and supplementing sodium hydroxide by the sodium hydroxide unit, a high-temperature sodium hydroxide solution prepared by the sodium hydroxide unit enters an electrolytic bath ionic membrane cathode unit in the electrolysis unit to be electrolyzed to generate high-concentration sodium hydroxide, and the high-concentration sodium hydroxide is used by the sodium hypochlorite synthesis unit and the brine and pure water treatment unit; and the sodium hydroxide solution prepared by the sodium hydroxide unit and chlorine gas produced by the anode of the ion membrane electrolytic cell of the electrolytic unit are synthesized into the finished sodium hypochlorite solution in the sodium hypochlorite synthesis unit.
The device further comprises a salt dissolving unit, wherein the brine and pure water treatment unit pretreats tap water into pure water for dissolving refined salt in the salt dissolving unit or directly injecting the calcium and magnesium removed refined brine into the salt dissolving unit; after the brine is treated by the brine and pure water treatment unit, high-temperature brine enters the anode end of the electrolysis unit, and dilute brine returns to the brine and pure water treatment unit for dechlorination after electrolysis in the ion membrane electrolysis tank; then enters the salt dissolving unit to dissolve salt or is evaporated into saturated salt water in the salt water and pure water processing unit.
Further, the dechlorination treatment of the brine and pure water treatment unit specifically comprises the steps of discharging chlorine in the dilute brine by using a vacuum pump and an ejector or evaporating the dilute brine at high temperature until the dilute brine is a saturated solution, removing the chlorine, and feeding the chlorine into a sodium hypochlorite synthesis unit for tail gas absorption.
The chlorine gas generated by the electrolysis unit enters the chlorine gas unit for heat exchange and then is used by the sodium hypochlorite synthesis unit and the HCl synthesis unit, the hydrogen gas and the chlorine gas generated by the electrolysis unit are used by the HCl synthesis unit after heat exchange and dehydration through the hydrogen gas unit and the chlorine gas unit, and the residual hydrogen gas is diluted by the hydrogen gas discharge unit and then passes through a flame arrester in the hydrogen gas discharge unit for safe discharge; the HCl synthesis unit is used for processing pure chlorine and hydrogen entering the HCl synthesis unit into HCl for the polyaluminium chloride synthesis unit, the brine and pure water processing unit and the electrolysis unit to use; the added aluminum hydroxide and HCl produced by the HCl synthesis unit are mixed and heated in a reaction kettle in the polyaluminium chloride synthesis unit for synthesis, and then are subjected to filter pressing to generate drinking water grade polyaluminium chloride solution, and the drinking water grade polyaluminium chloride solution enters the polyaluminium chloride management unit.
The hydrogen discharging unit is used for performing liquid separation treatment on the excess hydrogen of the hydrogen unit and then injecting a large amount of air or nitrogen produced by the nitrogen unit into the separation device to enable the hydrogen concentration to be lower than 1% and then discharging the hydrogen; the UPS power supply unit continuously supplies power to the control system, and the solution in the electrolytic cell in the electrolytic unit is automatically switched into pure water through the control system and continuously circulates; and the nitrogen unit injects nitrogen into the electrolysis unit, the hydrogen unit, the chlorine unit, the sodium hydroxide unit, the hydrogen discharge unit, the sodium hypochlorite synthesis unit, the brine and pure water treatment unit and the HCl synthesis unit.
Further, the hydrogen unit and the chlorine unit are controlled to stably supply gas, the HCl synthesis unit starts to synthesize after the cooling device is smooth, and an acid mist absorber is configured in the synthesis process to absorb gasified HCl.
Further, the polyaluminum chloride synthesis unit prepares the polyaluminum chloride solution on line on site, the raw material HCl comes from the HCl synthesis unit, aluminum hydroxide is added into a reaction kettle in the polyaluminum chloride synthesis unit, and the mixture is heated and stirred by a heater, cooled and filter-pressed to produce the polyaluminum chloride solution.
Further, the anode of the electrolysis unit uses a titanium coating electrode, the cathode uses a nickel coating electrode, and an ionic membrane is matched between the anode and the cathode; the electrolyte uses high-temperature saline water and high-temperature alkali, and the temperature is not lower than 55 ℃.
Furthermore, the sodium hypochlorite synthesis unit prepares a sodium hypochlorite solution on site and on line, the saline can be reused, the sodium chloride can be completely consumed, and the sodium hypochlorite solution with the concentration less than or equal to 18% is prepared.
Further, the system also comprises an AC power supply unit, a DC rectification unit and a UPS standby power supply which supply power for the system and are managed by a control system through a key.
Compared with the prior art, the invention has the beneficial effects that:
1. the large chlor-alkali device is miniaturized and forms a water treatment centralized station system by matching with a polyaluminium chloride production process, the production efficiency is improved, the energy consumption is reduced, the raw material consumption is reduced, the logistics process is reduced, the maintenance and management cost is saved, chlorate byproducts possibly generated in the production process of sodium hypochlorite are reduced or eliminated, the production flow is prolonged, a high-quality polyaluminium chloride solution is directly prepared on site, the economic cost can be reduced, and the problems of safety and environmental protection can be solved.
2. The sodium hypochlorite solution is produced, and the flow is prolonged to the polyaluminium chloride production, so that the energy consumption and the material consumption can be reduced, the maintenance and management cost can be saved, and the chlorate by-product can be reduced.
Drawings
Fig. 1 is a block diagram of a water treatment centralized station system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, an embodiment of the present invention provides a water treatment centralized station system, including a brine and pure water treatment unit, a sodium hydroxide unit, a sodium hypochlorite synthesis unit, an electrolysis unit, and a sodium hypochlorite management unit, where pure water produced by the brine and pure water treatment unit is used for the sodium hydroxide unit to dissolve and supplement sodium hydroxide, and a high-temperature sodium hydroxide solution prepared by the sodium hydroxide unit enters an electrolytic tank ionic membrane cathode unit in the electrolysis unit to be electrolyzed to generate high-concentration sodium hydroxide for the sodium hypochlorite synthesis unit and the brine and pure water treatment unit; and the sodium hydroxide solution produced by the electrolysis unit is subjected to heat exchange and dilution in the sodium hydroxide unit and then supplied to the sodium hypochlorite synthesis unit to synthesize the sodium hypochlorite solution, and the sodium hydroxide solution prepared by the sodium hydroxide unit and chlorine produced by the anode of the ion membrane electrolysis cell of the electrolysis unit are synthesized into finished sodium hypochlorite in the sodium hypochlorite synthesis unit. In this embodiment, sodium hydroxide is dissolved and supplemented in a pure water sodium hydroxide supply unit produced in a brine and pure water treatment unit, and a high-temperature sodium hydroxide solution prepared by a sodium hydroxide unit enters an electrolytic cell ionic membrane cathode unit cell in an electrolytic cell to be electrolyzed to generate high-concentration sodium hydroxide for a sodium hypochlorite synthesis unit and a brine and pure water treatment unit; the sodium hydroxide solution produced by the electrolysis unit is subjected to heat exchange and dilution in the sodium hydroxide unit and then is supplied to the sodium hypochlorite synthesis unit to synthesize the sodium hypochlorite solution, the sodium hydroxide solution prepared by the sodium hydroxide unit and chlorine gas produced by the anode of the ion membrane electrolysis cell of the electrolysis unit are synthesized into a finished product sodium hypochlorite in the sodium hypochlorite synthesis unit, and the finished product sodium hypochlorite enters the sodium hypochlorite management unit to be used on site and is distributed to storage containers of peripheral waterworks, sewage plants, sewage stations and other application units by an intelligent control system.
As an optimized scheme of the embodiment of the present invention, referring to fig. 1, the system further includes a salt dissolving unit, where the brine and pure water processing unit pretreats the tap water into pure water for the salt dissolving unit to dissolve refined salt or directly inject the refined salt water without calcium and magnesium into the salt dissolving unit; after the brine is treated by the brine and pure water treatment unit, high-temperature brine enters the anode end of the electrolysis unit, and dilute brine returns to the brine and pure water treatment unit for dechlorination after electrolysis in the ion membrane electrolysis tank; then enters the salt dissolving unit to dissolve salt or is evaporated into saturated salt water in the salt water and pure water processing unit. In this embodiment, tap water is pretreated into pure water in the brine and pure water treatment unit, and the pure water is supplied to the salt dissolving unit to dissolve refined salt, or the refined brine without calcium and magnesium is directly injected into the salt dissolving unit; the produced pure water is used for dissolving the sodium hydroxide unit and supplementing the sodium hydroxide, and the high-temperature sodium hydroxide solution proportioned by the sodium hydroxide unit enters an electrolytic ion membrane cathode unit groove in an electrolytic unit to be electrolyzed to generate high-concentration sodium hydroxide; used for a polyaluminium chloride synthesis unit; simultaneously for each base unit. After the brine is treated by process equipment such as heating decalcification and magnesium removal of a brine and pure water treatment unit, high-temperature brine enters an anode end of an electrolysis unit and is electrolyzed in an ion membrane electrolysis cell, and dilute brine returns to the brine and pure water treatment unit for dechlorination; then the salt is dissolved in a salt dissolving unit, or the salt is evaporated into saturated salt water in a salt water and pure water processing unit for standby.
In order to further optimize the above scheme, referring to fig. 1, the dechlorination treatment of the brine and pure water treatment unit specifically includes using a vacuum pump and an ejector to separate out chlorine gas from the dilute brine or using high temperature to evaporate the dilute brine until the dilute brine is a saturated solution. In this embodiment, the dechlorination method includes: the method for separating out chlorine in the dilute brine by using a vacuum pump and an ejector or evaporating the dilute brine at high temperature until the dilute brine is a saturated solution solves the problem of environmental pollution possibly caused by discharge of the dilute brine, avoids the damage of free chlorine contained in the dilute brine to chelate resin, an organic membrane or an inorganic membrane in a brine system, reduces the use of dechlorination agents, and fully converts chlorine produced by an electrolysis unit into a finished sodium hypochlorite solution.
As an optimization scheme of the embodiment of the present invention, please refer to fig. 1, the system further includes a hydrogen unit, a chlorine unit, an HCl synthesis unit, a hydrogen discharge unit, an aluminum polychloride synthesis unit, and an aluminum polychloride management unit, wherein chlorine generated by the electrolysis unit enters the chlorine unit for heat exchange and is then supplied to the sodium hypochlorite synthesis unit and the HCl synthesis unit for use, hydrogen and chlorine generated by the electrolysis unit are supplied to the HCl synthesis unit after heat exchange and dehydration between the hydrogen unit and the chlorine unit, and residual hydrogen is diluted by the hydrogen discharge unit and then safely discharged by a flame arrester inside the hydrogen discharge unit; the HCl synthesis unit is used for processing pure chlorine and hydrogen entering the HCl synthesis unit into HCl for the polyaluminum chloride synthesis unit, the brine and pure water processing unit and the electrolysis unit to use; the added aluminum hydroxide and HCl produced by the HCl synthesis unit are mixed and heated in a reaction kettle in the polyaluminium chloride synthesis unit for synthesis, and then are subjected to filter pressing to generate drinking water grade polyaluminium chloride solution, and the drinking water grade polyaluminium chloride solution enters the polyaluminium chloride management unit. In the embodiment, chlorine generated by the electrolysis unit enters the chlorine unit for heat exchange and then is used by the sodium hypochlorite synthesis unit and the HCl synthesis unit, hydrogen and chlorine generated by the electrolysis unit are used by the HCl synthesis unit after heat exchange, dehydration and other processes of the hydrogen unit and the chlorine unit, and the rest hydrogen is diluted by the hydrogen discharge unit and then safely discharged after passing through a flame arrester in the hydrogen discharge unit; the HCl synthesis unit is used for producing high-quality HCl for the polyaluminium chloride synthesis unit, the brine and pure water treatment unit and the electrolysis unit after the pure chlorine and the hydrogen entering the HCl synthesis unit are ignited by the automatic ignition device; the added aluminum hydroxide and HCl produced by the HCl synthesis unit are mixed and heated in a reaction kettle in the polyaluminium chloride synthesis unit for synthesis, and then are subjected to filter pressing to generate drinking water grade polyaluminium chloride solution, and the drinking water grade polyaluminium chloride solution enters the polyaluminium chloride management unit for on-site use and automatic distribution to peripheral tap water plants, sewage stations and other application points for storage and use.
As an optimization scheme of the embodiment of the present invention, please refer to fig. 1, the system further includes a UPS power supply unit and a nitrogen unit, wherein the hydrogen discharge unit injects a large amount of air or nitrogen into the separation device after performing liquid separation treatment on the excess hydrogen of the hydrogen unit to make the hydrogen concentration lower than 1% and then discharges the excess hydrogen; the UPS power supply unit continuously supplies power to the control system, and the solution in the electrolytic cell in the electrolytic unit is automatically switched into pure water through the control system and continuously circulates; and the nitrogen unit injects nitrogen into the electrolysis unit, the hydrogen unit, the chlorine unit, the hydrogen discharge unit, the sodium hypochlorite synthesis unit and the brine and pure water treatment unit. In the embodiment, after the surplus hydrogen of the hydrogen unit is subjected to liquid separation treatment in the hydrogen discharge unit, a large amount of air or nitrogen is injected into the separation device to ensure that the hydrogen concentration is safely removed within 1%; when the commercial power is stopped, the electrolysis system is automatically stopped, the UPS power supply unit continuously supplies power to the control system, and the solution in the electrolysis cell in the electrolysis unit is automatically switched into pure water through the control system and continuously circulates; the nitrogen unit injects nitrogen into the electrolysis unit, the hydrogen unit, the chlorine unit, the hydrogen discharge unit, the sodium hypochlorite synthesis unit and the brine and pure water treatment unit, and is used for discharging the gas in each unit to safely discharge the processed tail gas in each rear-end tail gas treatment system.
As an optimization scheme of the embodiment of the present invention, please refer to fig. 1, wherein the hydrogen unit and the chlorine unit are controlled to supply gas stably, and after the cooling device is smooth, the HCl synthesis unit starts to synthesize HCl, and an acid mist absorber is configured to absorb and gasify HCl during the synthesis process. In this example, the HCl synthesis comprises: nitrogen is used for purging and removing before synthesis in the synthesis tower, so that safety risks are eliminated; controlling the hydrogen unit and the chlorine unit to stably supply gas, and starting synthesis after the cooling device is smooth; when the reaction is stopped, the waste gas is blown out and enters a tail gas absorption tower for treatment and then is exhausted, and an acid mist absorber is configured in the synthesis process to absorb the gasified HCl.
Referring to fig. 1, the polyaluminum chloride synthesis unit prepares a polyaluminum chloride solution on site on line, the raw material HCl comes from the HCl synthesis unit, and after aluminum hydroxide is added and mixed in a reaction kettle in the polyaluminum chloride synthesis unit, a heater is controlled by an automatic control system to heat and stir, and the polyaluminum chloride solution is produced after cooling and filter pressing. In this example, the synthetic polyaluminum chloride solution comprised: the method comprises the steps of preparing polyaluminum chloride solution on line on site, wherein HCl serving as a raw material comes from an HCl synthesis unit, adding aluminum hydroxide into a reaction kettle in the polyaluminum chloride synthesis unit, mixing, controlling a heater to heat and stir through an automatic control system, and cooling and filter-pressing to produce the polyaluminum chloride solution.
As an optimization scheme of the embodiment of the invention, please refer to fig. 1, an anode of the electrolysis unit uses a titanium coated electrode, a cathode uses a nickel coated electrode, and an ion film is matched between the anode and the cathode; the electrolyte uses high-temperature saline water and high-temperature alkali, and the temperature is not lower than 55 ℃. In the embodiment, the anode of the electrolysis electrode is a titanium coating electrode, the cathode of the electrolysis electrode is a nickel coating electrode, and an ionic membrane is matched between the anode and the cathode; the electrolyte uses high-temperature saline water and high-temperature alkali, the temperature is not lower than 55 ℃, and the aims of saving energy and reducing consumption are achieved.
As an optimization scheme of the embodiment of the invention, please refer to fig. 1, the sodium hypochlorite synthesis unit prepares the sodium hypochlorite solution on line on site, the saline water can be reused, the sodium chloride can be completely consumed, and the sodium hypochlorite solution with concentration less than or equal to 18% is prepared. In this example, the synthetic sodium hypochlorite solution comprises: the sodium hypochlorite solution is prepared on line on site, the saline water is reused, the sodium chloride can be completely consumed, the prepared sodium hypochlorite solution is less than or equal to 18 percent, and the concentration of the prepared sodium hypochlorite solution can be set through an intelligent control system.
Referring to fig. 1 as an optimized solution of the embodiment of the present invention, the system further includes an AC power supply unit and a DC rectification unit for supplying power to the system. The system control adopts one-key operation, sensor signals such as flow, temperature, pressure, pH, ORP, current, voltage, conductivity, residual chlorine, valve opening degree, liquid level, chlorine, hydrogen chloride, nitrogen and the like are accessed on site, and various pumps, valves, power supply modules, fans, heaters, coolers and the like are subjected to flow control through a PLC system; the intelligent control system automatically and safely shuts down, and the electromechanical equipment is powered by the UPS and the mains supply, so that the water treatment centralized station system can automatically and safely stand by when power is cut off.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A water treatment concentration station system, characterized by: the device comprises a brine and pure water treatment unit, a sodium hydroxide unit, an electrolysis unit, a sodium hypochlorite synthesis unit, a polyaluminium chloride synthesis unit, a sodium hypochlorite management unit, a polyaluminium chloride management unit and the like, and an automatic control system, wherein pure water produced by the brine and pure water treatment unit is used for dissolving and supplementing sodium hydroxide by the sodium hydroxide unit, a high-temperature sodium hydroxide solution prepared by the sodium hydroxide unit enters an electrolytic bath ionic membrane cathode unit in the electrolysis unit to be electrolyzed to generate high-concentration sodium hydroxide, and the high-concentration sodium hydroxide is used by the sodium hypochlorite synthesis unit and the brine and pure water treatment unit; and the sodium hydroxide solution prepared by the sodium hydroxide unit and chlorine gas produced by the anode of the ionic membrane electrolytic cell of the electrolytic unit are synthesized into the finished sodium hypochlorite solution in the sodium hypochlorite synthesis unit.
2. A water treatment concentration station system as defined in claim 1 wherein: the salt water and pure water treatment unit pretreats tap water into pure water for the salt dissolving unit to dissolve refined salt or directly inject the refined salt water without calcium and magnesium into the salt dissolving unit; after the brine is treated by the brine and pure water treatment unit, high-temperature brine enters the anode end of the electrolysis unit, and dilute brine returns to the brine and pure water treatment unit for dechlorination after electrolysis in the ion membrane electrolysis tank; then enters the salt dissolving unit to dissolve salt or is evaporated into saturated salt water in the salt water and pure water processing unit.
3. A water treatment concentration station system as defined in claim 2, wherein: the dechlorination treatment of the brine and pure water treatment unit comprises the steps of discharging chlorine in the dilute brine by using a vacuum pump and an ejector or evaporating the dilute brine at high temperature until the dilute brine is a saturated solution, and removing the chlorine and introducing the chlorine into a sodium hypochlorite synthesis unit for tail gas absorption.
4. A water treatment concentration station system as defined in claim 1, wherein: the chlorine gas generated by the electrolysis unit enters the chlorine gas unit for heat exchange and then is used by the sodium hypochlorite synthesis unit and the HCl synthesis unit, the hydrogen gas and the chlorine gas generated by the electrolysis unit are subjected to heat exchange and dehydration by the hydrogen gas unit and the chlorine gas unit and then are used by the HCl synthesis unit, and the residual hydrogen gas is diluted by the hydrogen gas discharge unit and then is safely discharged by a flame arrester in the hydrogen gas discharge unit; the HCl synthesis unit is used for processing pure chlorine and hydrogen entering the HCl synthesis unit into HCl for the polyaluminium chloride synthesis unit, the brine and pure water processing unit and the electrolysis unit to use; the added aluminum hydroxide and HCl produced by the HCl synthesis unit are mixed and heated in a reaction kettle in the polyaluminium chloride synthesis unit for synthesis, and then are subjected to filter pressing to generate drinking water grade polyaluminium chloride solution, and the drinking water grade polyaluminium chloride solution enters the polyaluminium chloride management unit.
5. A water treatment station system as claimed in claim 4, wherein: the hydrogen discharging unit is used for performing liquid separation treatment on the excess hydrogen of the hydrogen unit and then injecting a large amount of air or nitrogen produced by the nitrogen unit into the separation device to enable the hydrogen concentration to be lower than 1% and then discharging the excess hydrogen; the UPS power supply unit continuously supplies power to the control system, and the solution in the electrolytic cell in the electrolytic unit is automatically switched into pure water through the control system and continuously circulates; and the nitrogen unit injects nitrogen into the electrolysis unit, the hydrogen unit, the chlorine unit, the sodium hydroxide unit, the hydrogen discharge unit, the sodium hypochlorite synthesis unit, the brine and pure water treatment unit and the HCl synthesis unit.
6. A water treatment concentration station system as defined in claim 4, wherein: and controlling the hydrogen unit and the chlorine unit to stably supply gas, after the cooling device is smooth, starting synthesis by the HCl synthesis unit, and configuring an acid mist absorber to absorb gasified HCl in the synthesis process.
7. A water treatment concentration station system as defined in claim 4, wherein: the polyaluminum chloride synthesis unit prepares polyaluminum chloride solution on site on line, the raw material HCl comes from the HCl synthesis unit, aluminum hydroxide is added into a reaction kettle in the polyaluminum chloride synthesis unit, and the mixture is heated and stirred by a heater, cooled and filter-pressed to produce the polyaluminum chloride solution.
8. A water treatment concentration station system as defined in claim 1, wherein: the anode of the electrolysis unit is a titanium coating electrode, the cathode of the electrolysis unit is a nickel coating electrode, and an ionic membrane is matched between the anode and the cathode; the electrolyte uses high-temperature saline water and high-temperature alkali, and the temperature is not lower than 55 ℃.
9. A water treatment concentration station system as defined in claim 1, wherein: the sodium hypochlorite synthesis unit prepares the sodium hypochlorite solution on line on site, the saline can be reused, the sodium chloride can be completely consumed, and the sodium hypochlorite solution with the concentration less than or equal to 18% is prepared.
10. A water treatment concentration station system as defined in claim 1, wherein: the system also comprises an AC power supply unit, a DC rectifying unit and a UPS standby power supply which supply power for the system and are managed by a control system through a key.
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Citations (21)
| Publication number | Priority date | Publication date | Assignee | Title |
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