An apparatus for desalinating seawater into water for industrial systems

Abstract

The application relates to a device for desalinating seawater into industrial system water, which comprises a decontamination sedimentation tank, a pre-mixed weak acid water treatment tank, an automatic control electrolytic dechlorination device tank, a layered detection water sedimentation tank and a pre-washing water clarification tank. The device for desalinating seawater into industrial system water can reduce the corrosion content of chlorine in seawater, desalinate seawater into industrial system water, and has the advantages of simple structure, low cost, internal circulation, zero emission, low corrosion of produced industrial system water and prevention of corrosion of the device for industrial system water.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of seawater desalination, in particular to a device for desalinating seawater into industrial system water. BACKGROUND

[0002] With the rapid development of economy, how to increase the development of water resource recovery, enhance the supply capacity has become an important issue, among them, seawater desalination, industrial circulating water dechlorination and salt reduction is an important means of industrial water supply.

[0003] Seawater desalination is to produce fresh water by desalination of seawater, which is an open source incremental technology to realize water resource utilization, and can increase the total amount of fresh water.

[0004] There are more than 20 kinds of global seawater desalination technologies, mainly divided into distillation method and membrane method, among which, the production cost is high, the utilization rate is low, and the current seawater desalination water utilization efficiency in various fields is about 60%, and the discharge cannot be well achieved. The standard of industrial water usage and discharge is seriously unbalanced. SUMMARY

[0005] Therefore, the purpose of the present application is to provide a device for desalinating seawater into industrial system water, which has the advantages of simple structure, low cost, zero discharge and high economic benefit.

[0006] A device for desalinating seawater into industrial system water, comprising a decontamination sedimentation tank, a pre-mixed weak acid water treatment tank, an automatic control electrolysis dechlorination device tank, a layered detection water sedimentation tank and a pre-washing water clarification tank.

[0007] The side wall of the impurity removal sedimentation tank is provided with an inlet and an outlet, and the impurity removal sedimentation tank is used for removing solid impurities in seawater; the outlet of the impurity removal sedimentation tank is communicated with the inlet of the pre-mixed weak acid water treatment tank; the outlet of the pre-mixed weak acid water treatment tank is communicated with the inlet of the automatic control electrolysis dechlorination device tank; a plurality of electrode groups and a power supply assembly are arranged in the automatic control electrolysis dechlorination device tank, each electrode group comprises an anode and a cathode, the anode is a titanium mesh covered with a polyurethane film, and the cathode is a titanium mesh; the anodes of the plurality of electrode groups are connected with the positive poles of the power supply assembly respectively, and the cathodes of the plurality of electrode groups are connected with the negative poles of the power supply assembly respectively; a spray absorption tower is arranged on the top of the automatic control electrolysis dechlorination device tank, the inlet of the spray absorption tower is communicated with the top of the automatic control electrolysis dechlorination device tank, a filler layer filled with a plurality of hollow spherical fillers is arranged in the middle of the spray absorption tower, a plurality of ejectors are arranged on the upper part of the spray absorption tower and above the filler layer filled with the plurality of hollow spherical fillers, and the plurality of ejectors are used for spraying caustic soda solution; the side wall of the layered water detection sedimentation tank is respectively provided with an inlet located at the lower part of the side wall, a first outlet located at the upper part of the side wall and a second outlet located at the middle part of the side wall; the inlet of the layered water detection sedimentation tank is communicated with the outlet of the automatic control electrolysis dechlorination device tank, the first outlet of the layered water detection sedimentation tank is communicated with the pre-mixed weak acid water treatment tank through a reflux pipeline; the second outlet of the layered water detection sedimentation tank is communicated with the inlet of the pre-washing water clarification tank; and the side wall of the pre-washing water clarification tank is further provided with an outlet.

[0008] The device for desalinating seawater into industrial water system can desalinate seawater into industrial water, seawater enters the inlet of the impurity removal sedimentation tank, solid impurities in seawater are removed through the impurity removal sedimentation tank, and seawater is input from the outlet of the impurity removal sedimentation tank into the pre-mixed weak acid water treatment tank, and is mixed with reflux liquid (containing part of HClO) from the first outlet of the layered water detection sedimentation tank through a reflux pipeline to form a first mixed liquid. Seawater is generally weakly alkaline, and under the adjustment of the reflux liquid, the conductivity of seawater can be improved in the pre-mixed weak acid water treatment tank, so that subsequent electrolysis is facilitated. Then, the first mixed liquid is input into the automatic control electrolysis dechlorination device tank for electrolysis. The anode is a titanium mesh covered with a polyurethane film, and the cathode is a titanium mesh, so that the first mixed liquid can easily pass through the mesh structure, the effective electrolysis area of the mesh structure is large, and electrolysis is more ideal; under the electrolysis, hydrogen and chlorine elements in the first mixed liquid are adsorbed on the cathode and the anode to be converted into hydrogen gas and chlorine gas, and under the electrolysis, hydrogen gas is adsorbed and combined with protons to form H3 + ; and under the electrolysis, hydrogen gas (H3 +hydrogen gas (in the form of H3 + hydrogen gas (in the form of H3

[0009] The device for desalination of seawater into industrial system water can reduce the content of corrosive chlorine in seawater, desalinate seawater into industrial system water, and has simple structure, low cost, internal circulation, zero emission, and low corrosion of the produced industrial system water, thereby preventing corrosion of the device for industrial system water.

[0010] Further, the impurity removal sedimentation tank, the weakly acidic water mixing treatment tank, the automatic control electrolysis and dechlorination device tank, and the layered detection water sedimentation tank are in an integrated structure, and the second outlet of the layered detection water sedimentation tank is connected to the inlet of the pre-washing water clarification tank through a pipeline. In some schemes, the impurity removal sedimentation tank, the weakly acidic water mixing treatment tank, the automatic control electrolysis and dechlorination device tank, and the layered detection water sedimentation tank can be formed into an integrated structure, i.e., in a box body, sequentially divided into the impurity removal sedimentation tank, the weakly acidic water mixing treatment tank, the automatic control electrolysis and dechlorination device tank, and the layered detection water sedimentation tank, so that the impurity removal sedimentation tank, the weakly acidic water mixing treatment tank, the automatic control electrolysis and dechlorination device tank, and the layered detection water sedimentation tank are in an integrated structure, forming a box body.

[0011] Further, the impurity removal sedimentation tank is provided with a filter plate between the inlet and the outlet of the impurity removal sedimentation tank; the filter plate is inclined towards the inlet of the impurity removal sedimentation tank and is arranged at an angle of 45° with respect to the bottom surface of the impurity removal sedimentation tank, and the filter plate is a quartz sand filter plate. In this way, solid impurities in seawater can be quickly and effectively removed.

[0012] Further, the mesh of the titanium mesh is in the shape of a rhombus.

[0013] Further, the inlet of the automatic control electrolysis dechlorination device tank is located at the lower part of the side wall, and the outlet of the automatic control electrolysis dechlorination device tank is located at the upper part of the side wall. The material enters the automatic control electrolysis dechlorination device tank from the lower part for electrolysis, and then flows out from the upper part after electrolysis.

[0014] Further, the electrodes of the plurality of electrode groups are arranged in a multipolar arrangement, and an induction electrode is further arranged between the anode and the cathode of the plurality of electrode groups, and the induction electrode is not connected to the power supply assembly; the induction electrode is a titanium mesh, the thickness of the induction electrode is 2-8 mm, and the area of the induction electrode is 20000-60000 mm 2 .

[0015] Further, the number of the plurality of electrode groups is 7-13 groups.

[0016] Further, the electrodes of the plurality of electrode groups are arranged in the order of cathode, anode, and cathode; specifically, the electrodes are arranged in the order of titanium mesh, titanium mesh with a polyurethane film on the surface, and titanium mesh.

[0017] Further, the thickness of the anode and the cathode is 2-5 mm, and the area of the anode and the cathode is 20000-60000 mm 2 .

[0018] Further, the voltage provided by the power supply assembly is 48-60 V, and the current is 1500-2500 A. In this way, electrolysis can be efficiently completed, and hydrogen and chlorine can be quickly and conveniently converted into hydrogen gas and chlorine gas.

[0019] Further, the device for desalinating seawater into industrial system water further comprises a PLC control system, the inlet and the outlet of the impurity removal sedimentation tank, the inlet and the outlet of the pre-mixed weak acid water treatment tank, the inlet and the outlet of the automatic control electrolysis dechlorination device tank, the inlet, the first outlet, and the second outlet of the layered detection water sedimentation tank, and the inlet and the outlet of the pre-washing water clarification tank are all provided with valves, the valves are respectively electrically connected to the PLC control system, and the PLC control system can control the opening degree of the valves.

[0020] Further, the premixing is provided with a salt content detector and a pH detector at the inlet and outlet of the weak acid water treatment tank, and at the inlet, the first outlet and the second outlet of the layered detection water precipitation tank, the salt content detector is used to monitor the conductivity and salinity of the liquid at the place, and the pH detector is used to monitor the pH value of the liquid at the place; the salt content detector and the pH detector are respectively electrically connected with the PLC control system, and the PLC control system can obtain the monitoring data signals of the salt content detector and the pH detector.

[0021] Further, the salt detector at the outlet of the weakly acidic water treatment tank is set with a first conductivity setting value. When the salt detector at the outlet of the weakly acidic water treatment tank detects that the conductivity is less than the first conductivity setting value, a signal is output to the PLC control system, which controls the valve opening at the first outlet of the layered water detection and precipitation tank to be larger and / or the valve opening at the inlet of the weakly acidic water treatment tank to be smaller. The seawater with removed solid impurities and the backflow liquid from the first outlet of the layered water detection and precipitation tank are mixed in the weakly acidic water treatment tank to form a first mixed liquid. In order to facilitate the subsequent input of the first mixed liquid into the automatic control electrolysis and dechlorination device tank and the easy conduction for the electrolysis work, the conductivity value of the first mixed liquid needs to meet a certain value. Therefore, on the salt detector at the outlet of the weakly acidic water treatment tank, the value is set as the first conductivity setting value. If the salt detector at the outlet of the weakly acidic water treatment tank detects that the conductivity is less than the first conductivity setting value, it indicates that the conductivity of the first mixed liquid input into the automatic control electrolysis and dechlorination device tank is relatively low, which is not conducive to the efficient electrolysis work in the automatic control electrolysis and dechlorination device tank. The salt detector at the outlet of the weakly acidic water treatment tank outputs a signal to the PLC control system, which controls the valve opening at the first outlet of the layered water detection and precipitation tank to be larger and / or the valve opening at the inlet of the weakly acidic water treatment tank to be smaller, so that the ratio of the amount of backflow liquid to the amount of seawater with removed solid impurities entering the weakly acidic water treatment tank becomes larger. That is, more backflow liquid is mixed with unit seawater with removed solid impurities in the weakly acidic water treatment tank, and adding more backflow liquid can increase the conductivity of the first mixed liquid, thereby facilitating the efficient electrolysis of the subsequent first mixed liquid in the automatic control electrolysis and dechlorination device tank. After the PLC control system controls the valve opening at the first outlet of the layered water detection and precipitation tank to be larger and / or the valve opening at the inlet of the weakly acidic water treatment tank to be smaller, until the salt detector at the outlet of the weakly acidic water treatment tank detects that the conductivity is greater than or equal to the first conductivity setting value, the PLC control system controls the valve opening at the first outlet of the layered water detection and precipitation tank to be smaller and / or the valve opening at the inlet of the weakly acidic water treatment tank to be larger.

[0022] Further, the first conductivity setting value is 1.5 S / m.

[0023] Further, the pH detector at the first outlet of the layered detection water sedimentation tank is set with a first pH setting value, when the pH detector at the first outlet of the layered detection water sedimentation tank detects that the pH is less than the first pH setting value, a signal is output to the PLC control system, the PLC control system controls the valve opening degree at the first outlet of the layered detection water sedimentation tank to be larger and the valve opening degree at the inlet of the pre-mixed weakly acidic water treatment tank to be smaller. The pH detector at the first outlet of the layered detection water sedimentation tank can monitor the pH of the liquid in the upper part of the layered detection water sedimentation tank, and the pH value of the liquid in the upper part can reflect the amount of the first mixed liquid electrolyzed in the unit time in the automatic control electrolysis dechlorination device tank, if the amount of the first mixed liquid electrolyzed in the unit time is too much, the chlorine gas generated is too much to dissolve in the water, then the low-density liquid (the low-density acid HClO is contained in the low-density liquid) in the second mixed liquid is more, and the pH value detected by the pH detector at the first outlet of the layered detection water sedimentation tank is lower. If the pH at the first outlet of the layered detection water sedimentation tank is lower than a certain value, it indicates that the amount of the first mixed liquid electrolyzed in the unit time in the automatic control electrolysis dechlorination device tank is too much, and the chlorine gas generated is too much to exceed the absorption load of the spray absorption tower. Therefore, in order to maintain the amount of the first mixed liquid electrolyzed in the unit time in the automatic control electrolysis dechlorination device tank and the stability of the absorption of the spray absorption tower, the pH at the first outlet of the layered detection water sedimentation tank needs to be higher than a certain value. The value is set as the first pH setting value on the pH detector at the first outlet of the layered detection water sedimentation tank. If the pH value detected by the pH detector at the first outlet of the layered detection water sedimentation tank is less than the first pH setting value, it indicates that the amount of the first mixed liquid electrolyzed in the unit time in the automatic control electrolysis dechlorination device tank is too much, and the chlorine gas generated is too much to exceed the absorption load of the spray absorption tower; the pH detector at the first outlet of the layered detection water sedimentation tank outputs a signal to the PLC control system, the PLC control system controls the valve opening degree at the first outlet of the layered detection water sedimentation tank to be larger and the valve opening degree at the inlet of the pre-mixed weakly acidic water treatment tank to be smaller, on the one hand, the amount of seawater is reduced, on the other hand, the liquid in the upper part of the layered detection water sedimentation tank can be timely removed from the layered detection water sedimentation tank to prevent affecting the discharge of the liquid at the second outlet of the layered detection water sedimentation tank.The PLC control system controls the valve opening at the first outlet of the layered detection water sedimentation tank to become larger and the valve opening at the inlet of the weak acid water treatment tank to become smaller, until the pH value detected by the pH detector at the first outlet of the layered detection water sedimentation tank is greater than or equal to the first pH set value, the PLC control system controls the valve opening at the first outlet of the layered detection water sedimentation tank to become smaller and the valve opening at the inlet of the weak acid water treatment tank to become larger.

[0024] Further, the plurality of ejectors in the spray absorption tower are electrically connected with the PLC control system, the PLC control system can control the amount of caustic soda solution sprayed by the plurality of ejectors; when the pH detector at the first outlet of the layered detection water sedimentation tank detects that the pH is less than the first pH set value, output a signal to the PLC control system, the PLC control system can also control the amount of caustic soda solution sprayed by the plurality of ejectors to increase to absorb more chlorine; until the pH value detected by the pH detector at the first outlet of the layered detection water sedimentation tank is greater than or equal to the first pH set value, the PLC control system controls the amount of caustic soda solution sprayed by the plurality of ejectors to decrease.

[0025] Further, the first pH set value is 6-7.

[0026] Further, the second outlet of the layered detection water sedimentation tank is also communicated with the automatic control electrolysis dechlorination device tank through a pipeline; the salinity detector at the second outlet of the layered detection water sedimentation tank is set with a first salinity setting value, when the salinity detector at the second outlet of the layered detection water sedimentation tank detects that the salinity is greater than the first salinity setting value, an output signal is sent to the PLC control system, the PLC control system controls the valve at the inlet of the pre-washing water clarification tank to be closed, so that the liquid in the layered detection water sedimentation tank flows back to the automatic control electrolysis dechlorination device tank to be electrolyzed again. The salinity detector at the second outlet of the layered detection water sedimentation tank can monitor the salinity (or chlorine content) of the liquid entering the pre-washing water clarification tank, and the liquid flowing out of the second outlet of the layered detection water sedimentation tank can be used as industrial system water, and the salinity (or chlorine content) of the industrial system water needs to be lower than a certain value to ensure that other equipment using the industrial system water will not corrode its parts. Therefore, on the salinity detector at the second outlet of the layered detection water sedimentation tank, the value is set as the first salinity setting value. If the salinity detector at the second outlet of the layered detection water sedimentation tank detects that the salinity is greater than the first conductivity setting value, it means that the second mixed liquid input from the automatic control electrolysis dechlorination device tank to the layered detection water sedimentation tank still contains a high content of chlorine, and the electrolysis is not complete. The salinity detector at the second outlet of the layered detection water sedimentation tank sends an output signal to the PLC control system, and the PLC control system controls the valve at the inlet of the pre-washing water clarification tank to be closed, so that the liquid in the layered detection water sedimentation tank flows back to the automatic control electrolysis dechlorination device tank to be electrolyzed again, until the salinity detector at the second outlet of the layered detection water sedimentation tank detects that the salinity is less than or equal to the first conductivity setting value, the PLC control system controls the valve at the inlet of the pre-washing water clarification tank to be opened, so that the liquid at the second outlet of the layered detection water sedimentation tank flows to the pre-washing water clarification tank.

[0027] Further, the chlorine content in the first salinity setting value is 3000 ppm. That is, the chlorine content of the liquid flowing from the second water outlet to the inlet of the washing water clarification tank is not more than 3000 ppm, which can be converted into the corresponding salinity value through the salinity conversion formula.

[0028] In order to better understand and implement, the present application is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 A work flow chart for the device for desalinating seawater into industrial system water of the present application to desalinate seawater;

[0030] Figure 2Fig. 1 is a schematic diagram of a part of a device for desalinating seawater into water for industrial systems according to the present application;

[0031] Figure 3 Fig. 4 is a schematic diagram of a spray absorption tower according to the present application. DETAILED DESCRIPTION

[0032] It should be noted that the described embodiments are merely a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort fall within the scope of the present application.

[0033] The terms used in the present application are merely for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein means and includes any or all possible combinations of one or more associated listed items.

[0034] The following description refers to the accompanying drawings. In the following description, same numbers in different drawings represent same or similar elements unless otherwise indicated. The implementation described in the following exemplary embodiments is not meant to represent all implementations consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present application as detailed in the appended claims. In the description of the present application, it should be understood that the terms "first", "second", "third", etc. are used merely to distinguish similar objects, and do not necessarily indicate a specific order or sequence, nor can they be understood as indicating or implying relative importance. The specific meanings of the above terms in the present application can be understood by those of ordinary skill in the art according to specific circumstances.

[0035] In addition, in the description of the present application, "a plurality of" means two or more, unless otherwise specified. The association between the associated objects is described by "and / or", which means that there can be three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. The character " / " generally represents a "or" relationship between the associated objects before and after it.

[0036] It should be understood that the present application is not limited to the precise structures already described and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

[0037] The present application provides a device for desalinating seawater into water for industrial systems, please refer to Figures 2-3, including a decontamination sedimentation tank 1, a weakly acidic water treatment tank 2, an automatic control electrolysis dechlorination device tank 3, a layered detection water sedimentation tank 4, and a pre-washing water clarification tank (not shown in the figure).

[0038] The side wall of the decontamination sedimentation tank 1 is provided with an inlet and an outlet, and the decontamination sedimentation tank 1 is used for removing solid impurities in seawater. In some embodiments, a filter plate (not shown in the figure) is arranged in the decontamination sedimentation tank 1, and the filter plate is located between the inlet and the outlet of the decontamination sedimentation tank 1; the filter plate is inclined towards the inlet of the decontamination sedimentation tank 1 and is arranged at an angle of 45° with respect to the bottom surface of the decontamination sedimentation tank, and the filter plate is a quartz sand filter plate. In this way, seawater passing through the decontamination sedimentation tank 1 can quickly and effectively remove solid impurities in seawater.

[0039] The outlet of the decontamination sedimentation tank 1 is in communication with the inlet of the weakly acidic water treatment tank 2, and the outlet of the weakly acidic water treatment tank 2 is in communication with the inlet of the automatic control electrolysis dechlorination device tank 3; a plurality of electrode groups 31 and a power supply assembly (not shown in the figure) are arranged in the automatic control electrolysis dechlorination device tank 3, each electrode group includes an anode and a cathode, the anode is a titanium mesh covered with a polyurethane film, and the cathode is a titanium mesh; the anodes of the plurality of electrode groups 31 are connected to the positive electrodes of the power supply assembly, and the cathodes of the plurality of electrode groups 31 are connected to the negative electrodes of the power supply assembly.

[0040] A spray absorption tower 5 is arranged at the top of the automatic control electrolysis dechlorination device tank 3, and in some embodiments, the inlet of the spray absorption tower 5 is in communication with the top of the automatic control electrolysis dechlorination device tank 3, please refer to Figure 3 A filler layer 51 filled with a plurality of hollow spherical balls is arranged in the middle of the spray absorption tower 5, and a plurality of ejectors 52 are arranged at the upper part of the spray absorption tower 5, above the filler layer 51 filled with a plurality of hollow spherical balls, and the plurality of ejectors 52 are used to spray caustic soda solution. In some embodiments, the concentration of sodium hydroxide in the caustic soda solution is 8.6wt%, and the source of caustic soda is not limited, which can be industrial caustic soda, etc. The bottom of the spray absorption tower is also provided with a storage tank 53. The structure of the spray absorption tower is not limited, which can correspond to the function of spray absorption.

[0041] The side wall of the layered detection water sedimentation tank 4 is respectively provided with an inlet located at the lower part of the side wall, a first outlet (not shown in the figure) located at the upper part of the side wall, and a second outlet (not shown in the figure) located at the middle part of the side wall; the inlet of the layered detection water sedimentation tank 4 is communicated with the outlet of the automatic control electrolysis dechlorination device tank 3. The first outlet of the layered detection water sedimentation tank 4 is communicated with the pre-mixed weak acid water treatment tank through a reflux pipeline (not shown in the figure), so as to facilitate the reflux of the liquid at the upper part of the layered detection water sedimentation tank 4 to the pre-mixed weak acid water treatment tank 2 in the form of reflux liquid; the second outlet of the layered detection water sedimentation tank 4 is communicated with the inlet of the pre-washing water clarification tank; the side wall of the pre-washing water clarification tank is also provided with an outlet.

[0042] In some embodiments, the impurity removal sedimentation tank 1, the pre-mixed weak acid water treatment tank 2, the automatic control electrolysis dechlorination device tank 3, and the layered detection water sedimentation tank 4 are integrally connected; the second outlet of the layered detection water sedimentation tank is communicated with the inlet of the pre-washing water clarification tank through a pipeline. That is, in some embodiments, referring to Figure 2 In one box body 10, the impurity removal sedimentation tank 1, the pre-mixed weak acid water treatment tank 2, the automatic control electrolysis dechlorination device tank 3, and the layered detection water sedimentation tank 4 are sequentially separated; so that the impurity removal sedimentation tank 1, the pre-mixed weak acid water treatment tank 2, the automatic control electrolysis dechlorination device tank 3, and the layered detection water sedimentation tank 4 are integrally connected to form the box body 10.

[0043] Further, the inlet of the automatic control electrolysis dechlorination device tank is located at the lower part of the side wall, and the outlet of the automatic control electrolysis dechlorination device tank is located at the upper part of the side wall. The material enters the automatic control electrolysis dechlorination device tank from the lower part for electrolysis, and flows out through the upper part after electrolysis.

[0044] In some embodiments, the electrode arrangement mode of the plurality of electrode groups is a bipolar arrangement mode, and an induction electrode is further arranged between the anode and the cathode of the plurality of electrode groups, and the induction electrode is not connected with the power supply assembly; the induction electrode is a titanium mesh, the thickness of the induction electrode is 2-8 mm, and the area of the induction electrode is 20000-60000 mm 2 .

[0045] In some embodiments, the electrode arrangement mode of the plurality of electrode groups is anode, cathode, and cathode arranged in sequence; specifically, titanium mesh, titanium mesh with polyurethane film on the surface, and titanium mesh arranged in sequence; the number of the plurality of electrode groups is 7-13 groups. The thickness of the anode and the cathode is 2-5 mm, and the area of the anode and the cathode is 20000-60000 mm 2 . The mesh hole of the titanium mesh is in a diamond shape.

[0046] In some embodiments, the power supply component provides a voltage of 48-60V and a current of 1500-2500A. The electrolysis can be efficiently completed, and hydrogen and chlorine can be quickly converted into hydrogen gas and chlorine gas. At the same time, hydrogen gas can also combine with protons to form H3 + , so as to be combined with the caustic soda solution sprayed by the plurality of sprayers in the spray absorption tower to form water.

[0047] In some embodiments, the device for desalinating seawater into industrial water further comprises a PLC control system (not shown in the figure), valves arranged at the inlet and outlet of the impurity removal sedimentation tank 1, the inlet and outlet of the weak acid water treatment tank 2, the inlet and outlet of the automatic control electrolysis dechlorination device tank 3, the inlet, the first outlet and the second outlet of the layered detection water sedimentation tank 4, and the inlet and outlet of the pre-washing water clarification tank, the valves being electrically connected to the PLC control system, and the PLC control system being capable of controlling the opening degree of the valves.

[0048] In some embodiments, salt content detectors (not shown in the figure) and pH detectors (not shown in the figure) are arranged at the inlet and outlet of the weak acid water treatment tank 2, and at the inlet, the first outlet and the second outlet of the layered detection water sedimentation tank 4, the salt content detectors being used for monitoring the conductivity and salinity of the liquid at the positions, and the pH detectors being used for monitoring the pH value of the liquid at the positions, the salt content detectors and the pH detectors being electrically connected to the PLC control system, and the PLC control system being capable of acquiring the monitoring data signals of the salt content detectors and the pH detectors.

[0049] In some embodiments, the salt content detector arranged at the outlet of the weak acid water treatment tank 2 is set with a first conductivity setting value, when the salt content detector arranged at the outlet of the weak acid water treatment tank 2 detects that the conductivity is less than the first conductivity setting value, a signal is output to the PLC control system, and the PLC control system controls the valve arranged at the first outlet of the layered detection water sedimentation tank to be opened larger and / or the valve arranged at the inlet of the weak acid water treatment tank 2 to be opened smaller. In some embodiments, the first conductivity setting value is 1.5 S / m.

[0050] In some embodiments, the pH detector arranged at the first outlet of the layered detection water sedimentation tank is set with a first pH setting value, when the pH detector arranged at the first outlet of the layered detection water sedimentation tank detects that the pH is less than the first pH setting value, a signal is output to the PLC control system, and the PLC control system controls the valve arranged at the first outlet of the layered detection water sedimentation tank to be opened larger and the valve arranged at the inlet of the weak acid water treatment tank to be opened smaller.

[0051] In some embodiments, the plurality of ejectors 52 in the spray absorption tower 5 are electrically connected with the PLC control system, which can control the amount of caustic soda solution sprayed by the plurality of ejectors 52; when the pH detector at the first outlet of the layered water detection sedimentation tank detects that the pH is less than the first pH set value, an output signal is sent to the PLC control system, and the PLC control system controls the amount of caustic soda solution sprayed by the plurality of ejectors to increase.

[0052] In some embodiments, the first pH set value is 6-7.

[0053] In some embodiments, the second outlet of the layered water detection sedimentation tank 4 also communicates with the automatic control electrolysis dechlorination device tank through a pipeline; the salinity detector at the second outlet of the layered water detection sedimentation tank 4 is set with a first salinity set value, when the salinity detector at the second outlet of the layered water detection sedimentation tank 4 detects that the salinity is greater than the first salinity set value, an output signal is sent to the PLC control system, and the PLC control system controls the valve at the inlet of the pre-washing water clarification tank to close, so that the liquid in the layered water detection sedimentation tank 4 flows back to the automatic control electrolysis dechlorination device tank for re-electrolysis. In some embodiments, the chlorine content in the first salinity set value is 3000 ppm. That is, the chlorine content of the liquid flowing from the second water outlet to the inlet of the washing water clarification tank does not exceed 3000 ppm, which can be converted into the corresponding salinity value through the salinity conversion formula.

[0054] Please refer to Figure 1 , the device for desalting seawater into industrial water, which can desalt seawater into industrial water, the specific working process is as follows:

[0055] (1) The seawater and / or washing sea sand water with high chlorine content enters from the inlet of the impurity removal sedimentation tank, and the seawater removes solid impurities such as sand, seaweed, etc. in the seawater through the impurity removal sedimentation tank;

[0056] (2) The seawater after removing impurity solids is input from the outlet of the impurity removal sedimentation tank to the pre-mixed weakly acidic water treatment tank; at the same time, the liquid in the upper part of the layered water detection sedimentation tank as a reflux liquid (containing part of HClO, i.e. Figure 3 HClO feedback water) is refluxed from the first outlet to the pre-mixed weakly acidic water treatment tank through a reflux pipeline, and effectively mixed with the seawater after removing impurity solids to form a first mixed liquid; the seawater is usually weakly alkaline, and under the adjustment of the reflux liquid in the pre-mixed weakly acidic water treatment tank, the conductivity of the seawater can be increased, and the first mixed liquid after mixing can be more easily conductive, which is convenient for subsequent electrolysis;

[0057] The seawater with solid impurities removed and the backflow liquid (containing part of HClO) from the first outlet of the stratified water detection sedimentation tank 4 are mixed in the pre-mixed weak acid water treatment tank 2 to form a first mixed liquid. In order to facilitate the subsequent input of the first mixed liquid into the automatic control electrolysis dechlorination device tank 3, and to easily conduct electricity for the electrolysis work, the conductivity value of the first mixed liquid needs to be greater than or equal to 1.5 S / m. The 1.5 S / m is set as the first conductivity set value on the salinity detector at the outlet of the pre-mixed weak acid water treatment tank 2. If the conductivity detected by the salinity detector at the outlet of the pre-mixed weak acid water treatment tank 2 is less than 1.5 S / m, it indicates that the conductivity of the first mixed liquid input into the automatic control electrolysis dechlorination device tank 3 is relatively low, which is not conducive to the efficient electrolysis work in the automatic control electrolysis dechlorination device tank. The salinity detector at the outlet of the pre-mixed weak acid water treatment tank 2 outputs a signal to the PLC control system, which controls the valve opening at the first outlet of the stratified water detection sedimentation tank to be larger and / or the valve opening at the inlet of the pre-mixed weak acid water treatment tank 2 to be smaller, so that the ratio of the amount of backflow liquid to the amount of seawater with solid impurities removed entering the pre-mixed weak acid water treatment tank 2 becomes larger. That is, more backflow liquid is mixed with unit seawater with solid impurities removed in the pre-mixed weak acid water treatment tank, and adding more backflow liquid can increase the conductivity of the first mixed liquid, thereby facilitating the subsequent efficient electrolysis of the first mixed liquid in the automatic control electrolysis dechlorination device tank. After the PLC control system controls the valve opening at the first outlet of the stratified water detection sedimentation tank to be larger and / or the valve opening at the inlet of the pre-mixed weak acid water treatment tank to be smaller, until the salinity detector at the outlet of the pre-mixed weak acid water treatment tank detects that the conductivity is greater than or equal to 1.5 S / m, the PLC control system controls the valve opening at the first outlet of the stratified water detection sedimentation tank to be smaller and / or the valve opening at the inlet of the pre-mixed weak acid water treatment tank to be larger.

[0058] (3) inputting the first mixed liquid into the automatic control electrolysis dechlorination device tank to perform electrolysis;

[0059] The anode is a titanium mesh covered with a polyurethane film, and the cathode is a titanium mesh. The first mixed liquid can easily pass through the mesh structure, and the effective electrolysis area of the mesh structure is large, making the electrolysis more ideal. The power supply assembly provides a voltage of 48-60 V and a current of 1500-2500 A, which can make the electrolysis efficient and complete, facilitate the adsorption of hydrogen and chlorine elements in the first mixed liquid on the cathode and anode under the action of electrolysis to convert into hydrogen and chlorine gas, and hydrogen gas can also combine with protons to form H3 + , which enters the spray absorption tower together with chlorine gas.

[0060] (4) In the spray absorption tower, the several injectors inject the caustic soda solution to the several multi-faceted hollow balls below, and hydrogen and chlorine are converted into concentrated brine under the absorption of the caustic soda solution and flow to the storage tank of the spray absorption tower, the concentrated brine can be used as by-products. In some embodiments, the generated concentrated brine can be further transferred to the electrolytic cell for electrolysis of the concentrated brine to obtain hypochlorous acid disinfectant water, which can be used as by-products to increase the income;

[0061] (5) The liquid after electrolysis of the first mixed solution is input as the second mixed solution from the outlet of the automatic control electrolysis dechlorination device pool to the inlet of the lower part of the side wall of the layered detection water sedimentation pool.

[0062] Wherein, the second mixed solution moves from the lower part to the upper part in the layered detection water sedimentation pool, due to the different densities of the substances in the second mixed solution, the low-density liquid (containing low-density acid HClO) in the second mixed solution moves upward to the upper part and flows back to the pre-mixed weak acid water treatment pool in the form of backflow liquid through the backflow pipeline from the first outlet. The medium-density liquid in the second mixed solution flows out from the second outlet to the pre-washing water clarification pool, and the chlorine content of the liquid flowing out from the second outlet is not more than 3000 ppm;

[0063] The pH detector at the first outlet of the layered detection water sedimentation tank 4 can monitor the pH of the upper liquid in the layered detection water sedimentation tank, and the pH of the upper liquid can reflect the amount of the first mixed liquid electrolyzed in the automatic control electrolysis dechlorination device tank per unit time. If the amount of the first mixed liquid electrolyzed per unit time is too much, the generated chlorine gas is too much to dissolve in water, and then the more low-density liquid (low-density liquid containing low-density acid HClO) in the second mixed liquid is formed, and the lower the pH value detected by the pH detector at the first outlet of the layered detection water sedimentation tank 4. In some embodiments, the pH detector at the first outlet of the layered detection water sedimentation tank 4 is set to a first pH set value of 6. If the pH value detected by the pH detector at the first outlet of the layered detection water sedimentation tank 4 is less than 6, it means that the amount of the first mixed liquid electrolyzed per unit time in the automatic control electrolysis dechlorination device tank 3 is too much, and the generated chlorine gas is too much to exceed the absorption load of the spray absorption tower; the pH detector at the first outlet of the layered detection water sedimentation tank 4 outputs a signal to the PLC control system, and the PLC control system controls the valve opening degree at the first outlet of the layered detection water sedimentation tank to be larger and the valve opening degree at the inlet of the weak acid water treatment tank to be smaller, on the one hand, reducing the amount of seawater, and on the other hand, the upper liquid of the layered detection water sedimentation tank can be pumped out in time to prevent affecting the discharge of the liquid at the second outlet of the layered detection water sedimentation tank; after the PLC control system controls the valve opening degree at the first outlet of the layered detection water sedimentation tank to be larger and the valve opening degree at the inlet of the weak acid water treatment tank to be smaller, until the pH value detected by the pH detector at the first outlet of the layered detection water sedimentation tank is greater than or equal to 6, the PLC control system controls the valve opening degree at the first outlet of the layered detection water sedimentation tank to be smaller and the valve opening degree at the inlet of the weak acid water treatment tank to be larger; in some embodiments, when the pH detector at the first outlet of the layered detection water sedimentation tank detects that the pH is less than 6, the PLC control system can also control the amount of caustic solution sprayed by the plurality of ejectors 52 to increase to absorb more chlorine gas; until the pH value detected by the pH detector at the first outlet of the layered detection water sedimentation tank is greater than or equal to 6, the PLC control system controls the amount of caustic solution sprayed by the plurality of ejectors to decrease;

[0064] The salt detector at the second outlet of the layered detection water sedimentation tank 4 can monitor the salinity (or chlorine content) of the liquid entering the pre-washing water clarification tank, and the liquid flowing out of the second outlet of the layered detection water sedimentation tank 4 can be used as industrial system water. The chlorine content of 3000 ppm is set as the first salinity setting value (which can be converted into the corresponding salinity value by the salinity conversion formula, which is a conventional conversion in the art) at the salt detector at the second outlet of the layered detection water sedimentation tank. If the salt detector at the second outlet of the layered detection water sedimentation tank 4 detects that the chlorine content is greater than 3000 ppm, it indicates that the second mixed liquid input into the layered detection water sedimentation tank 4 from the automatic control electrolysis dechlorination device tank 3 still contains a high content of chlorine, and the electrolysis is incomplete. The salt detector at the second outlet of the layered detection water sedimentation tank 4 outputs a signal to the PLC control system, which controls the valve at the inlet of the pre-washing water clarification tank to close, so that the liquid in the layered detection water sedimentation tank flows back to the automatic control electrolysis dechlorination device tank for re-electrolysis until the salt detector at the second outlet of the layered detection water sedimentation tank detects that the chlorine production is less than or equal to 3000 ppm. The PLC control system controls the valve at the inlet of the pre-washing water clarification tank to open, so that the liquid at the second outlet of the layered detection water sedimentation tank 4 flows out to the pre-washing water clarification tank.

[0065] (6) The liquid in the pre-washing water clarification tank is output from the outlet, which can be used as industrial system water.

[0066] Compared with the prior art, the device for desalinating seawater into industrial system water can reduce the corrosive chlorine content in seawater, and desalinate seawater into industrial system water. The device for desalinating seawater into industrial system water has the advantages of simple structure, low cost, internal circulation, zero discharge, and low corrosiveness of the produced industrial system water, which prevents the corrosion of the industrial system water equipment.

[0067] The above-described embodiments only express several embodiments of the present application, which are described in detail and specifically, but should not be understood as limiting the scope of the patent. It should be noted that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, and the present application also intends to include these modifications and improvements.

Claims

1. An apparatus for desalinating seawater into water for use in an industrial system, characterized by: The device comprises a decontamination sedimentation tank, a weakly acidic water treatment tank, an automatic control electrolysis dechlorination device tank, a layered detection water sedimentation tank, and a pre-washing water clarifier. The side wall of the impurity removal sedimentation tank is provided with an inlet and an outlet, and the impurity removal sedimentation tank is used for removing solid impurities in seawater; the outlet of the impurity removal sedimentation tank is communicated with the inlet of the weak acid water treatment tank; the outlet of the weak acid water treatment tank is communicated with the inlet of the automatic control electrolysis dechlorination device tank; a plurality of electrode groups and a power supply assembly are arranged in the automatic control electrolysis dechlorination device tank, each electrode group includes an anode and a cathode, the anode is a titanium mesh covered with a polyurethane film, and the cathode is a titanium mesh; the anodes of the plurality of electrode groups are connected with the positive poles of the power supply assembly respectively, and the cathodes of the plurality of electrode groups are connected with the negative poles of the power supply assembly respectively; the number of the plurality of electrode groups is 7-13 groups, the thickness of the anode and the cathode is 2-5 mm, and the area is 20000-60000 mm 2 ; the power supply assembly provides a voltage of 48-60 V and a current of 1500-2500 A; a spray absorption tower is arranged on the top of the automatic control electrolysis dechlorination device tank, the inlet of the spray absorption tower is communicated with the top of the automatic control electrolysis dechlorination device tank, a filler layer filled with a plurality of hollow spherical balls is arranged in the middle of the spray absorption tower, a plurality of ejectors are arranged on the upper part of the spray absorption tower, the plurality of ejectors are located above the filler layer filled with a plurality of hollow spherical balls, and the plurality of ejectors are used for spraying caustic soda solution; the side wall of the layered water detection sedimentation tank is respectively provided with an inlet located at the lower part of the side wall, a first outlet located at the upper part of the side wall and a second outlet located at the middle part of the side wall; the inlet of the layered water detection sedimentation tank is communicated with the outlet of the automatic control electrolysis dechlorination device tank, the first outlet of the layered water detection sedimentation tank is communicated with the weak acid water treatment tank through a reflux pipeline; the second outlet of the layered water detection sedimentation tank is communicated with the inlet of the pre-washing water clarification tank; and the side wall of the pre-washing water clarification tank is also provided with an outlet.

2. The apparatus for desalinating seawater into water for industrial systems according to claim 1, characterized in that: The decontamination sedimentation tank, the weakly acidic water treatment tank, the automatic control electrolysis dechlorination device tank, and the layered detection water sedimentation tank are integrally connected; the second outlet of the layered detection water sedimentation tank is connected to the inlet of the pre-washing water clarifier through a pipeline.

3. The apparatus for desalinating seawater into water for industrial systems according to claim 1, characterized in that: The device for desalinating seawater into industrial system water further comprises a PLC control system, and the inlet and outlet of the decontamination sedimentation tank, the inlet and outlet of the weakly acidic water treatment tank, the inlet and outlet of the automatic control electrolysis dechlorination device tank, the inlet, first outlet, and second outlet of the layered detection water sedimentation tank, and the inlet and outlet of the pre-washing water clarifier are all provided with valves, which are electrically connected to the PLC control system, and the PLC control system can control the opening degree of the valves.

4. The apparatus for desalinating seawater into water for industrial systems according to claim 3, characterized in that: The inlet and outlet of the weakly acidic water treatment tank, and the inlet, first outlet, and second outlet of the layered detection water sedimentation tank are all provided with a salinity detector and a pH detector, the salinity detector is used to monitor the conductivity and salinity of the liquid at the location, and the pH detector is used to monitor the pH value of the liquid at the location; the salinity detector and the pH detector are electrically connected to the PLC control system, and the PLC control system can acquire the monitoring data signals of the salinity detector and the pH detector.

5. The apparatus for desalinating seawater into water for industrial systems according to claim 4, characterized in that: The salinity detector at the outlet of the weakly acidic water treatment tank is set with a first conductivity setting value, when the salinity detector at the outlet of the weakly acidic water treatment tank detects that the conductivity is less than the first conductivity setting value, a signal is output to the PLC control system, and the PLC control system controls the valve at the first outlet of the layered detection water sedimentation tank to be opened larger and / or the valve at the inlet of the weakly acidic water treatment tank to be opened smaller.

6. The apparatus for desalinating seawater into water for industrial systems according to claim 5, characterized in that: The pH detector at the first outlet of the layered detection water sedimentation tank is set with a first pH setting value, when the pH detector at the first outlet of the layered detection water sedimentation tank detects that the pH is less than the first pH setting value, a signal is output to the PLC control system, and the PLC control system controls the valve at the first outlet of the layered detection water sedimentation tank to be opened larger and the valve at the inlet of the weakly acidic water treatment tank to be opened smaller.

7. The apparatus for desalinating seawater into water for industrial systems according to claim 6, characterized in that: The second outlet of the layered detection water sedimentation tank is also connected to the automatic control electrolysis dechlorination device tank through a pipeline; the salinity detector at the second outlet of the layered detection water sedimentation tank is set with a first salinity setting value, when the salinity detector at the second outlet of the layered detection water sedimentation tank detects that the salinity is greater than the first salinity setting value, a signal is output to the PLC control system, and the PLC control system controls the valve at the inlet of the pre-washing water clarifier to be closed, so that the liquid in the layered detection water sedimentation tank flows back to the automatic control electrolysis dechlorination device tank for re-electrolysis.

Images