Central water treatment filtering device for desalted water production

Abstract

The utility model discloses a central water treatment filtering device for desalted water production. A raw water inlet pipe of a reservoir is communicated with a water inlet pipeline of each filter; the ultrafiltration processors are connected in series; a water outlet of each filter is communicated with a water inlet pipeline of the first-stage ultrafiltration treater; a water outlet of the N-stage ultrafiltration treater is communicated with a water inlet pipeline of the filtered water storage tank; a water outlet of the filtered water storage tank is communicated with a water inlet pipeline of the primary reverse osmosis processor; all stages of reverse osmosis processors are connected in series, and water outlets of the N stages of reverse osmosis processors are communicated with a demineralized water storage tank pipeline. According to the device, the content of various pollutants in water entering the ultrafilter can be reduced, a filter element for ultrafiltration and reverse osmosis can be protected, the content of various impurity ions in the water after ultrafiltration is reduced, the conductivity of produced water is about 10 us / cm, the hardness is 0.01 mol / L or below, the produced water is used for supplementing water for a steelmaking and steel rolling heating furnace, and generated steam can be used for power generation of a steam turbine. Water consumption is reduced, resources are saved, and the accumulation speed of scale in the boiler is effectively reduced.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of iron smelting production, in particular to a central water treatment and filtering device for desalted water production. BACKGROUND

[0002] Pure water is basically required in each process of steel production, which can be used for cooling equipment to prevent shutdown due to high temperature, cooling products, cooling byproducts and producing steam for power generation. The water has the characteristics of large amount and uninterrupted supply, and the purity requirements of water in each process are not completely the same. In order to improve the service life of equipment and reduce the plugging or slagging in the cooling heat exchange pipe, the cooling water of the equipment is softened water, and the cooling heat exchange device attached to part of the equipment has higher requirements on water quality and needs to use desalted water. The amount of industrial circulating water accounts for about 49% of the total water consumption, the amount of desalted water accounts for about 21% of the total water consumption, and the amount of softened water accounts for about 30% of the total water consumption.

[0003] The hardness of softened water needs to be less than 0.03 mmol / L. The hardness mainly reflects the concentration of calcium (Ca 2+ ) and magnesium (Mg 2+ ) ions in water. When the hard raw water passes through the resin layer of the exchanger, the calcium and magnesium ions in the water are adsorbed by the resin, and sodium ions are released at the same time. However, when the resin adsorbs calcium and magnesium ions to saturation, the hardness of the effluent increases. At this time, the softener will automatically regenerate the invalid resin according to the predetermined program, and a high-concentration sodium chloride solution (salt water) is introduced into the resin to restore the invalid resin to sodium resin, and then the water treatment is continued to obtain softened water.

[0004] The production process of softened water needs to consume a large amount of industrial salt, and each cubic meter of softened water consumes industrial salt, and a large amount of wastewater with high chloride ion content is generated. After neutralization, the recycling effect of such wastewater is poor, and the high chloride ion content will lead to the inability to sell the by-products generated by recycling, resulting in the accumulation of waste, and the high chloride ion content in the wastewater will increase the difficulty of wastewater treatment and the amount of treatment chemicals. Further, it leads to high production cost of softened water.

[0005] Moreover, with the serious pollution of surface water, it is often necessary to exploit underground water, and the hardness of underground water is relatively high, which leads to the need for softening treatment of such water before production, and the high hardness of raw water further increases the amount of industrial salt and the discharge amount of high-sodium wastewater.

[0006] Desalinated water refers to product water obtained by removing impurities such as suspended solids, colloids, inorganic cations and anions in water by using an ultrafiltration reverse osmosis process. However, the desalinated water has a high requirement for the purity of the feed water, and the existing water treatment equipment cannot meet the requirement of the feed water for the ultrafiltration reverse osmosis processor. Softened water is usually used as the raw water for preparing desalinated water, but this leads to the fact that the consumption of industrial salt cannot be reduced in the production of softened water in the industrialized large-scale production, the waste water cannot be effectively treated, and the production cost of the enterprise is increased. Meanwhile, the existing desalinated water production equipment has poor water supply stability, which affects the normal production of the orderly production of the steelmaking process.

[0007] The information disclosed in the background section is only intended to increase an understanding of the general context of the application and should not be taken as an acknowledgement or any form of suggestion that this information forms prior art that is already known to those of ordinary skill in the art. SUMMARY

[0008] The present application provides a central water treatment filter device for desalinated water production, which can produce desalinated water with a sodium content meeting the requirements and a continuous water output stability.

[0009] The present application provides a central water treatment filter device for desalinated water production, which can produce desalinated water with a sodium content meeting the requirements and a continuous water output stability.

[0010] The reservoir raw water inlet pipe is in communication with the water inlets of the filters; and the ultrafiltration processors are connected in series.

[0011] The water outlets of the filters are respectively in communication with the water inlets of the first-stage ultrafiltration processors.

[0012] The water outlets of the N-stage ultrafiltration processors are in communication with the water inlets of the filtered water storage tanks.

[0013] The water outlets of the filtered water storage tanks are in communication with the water inlets of the first-stage reverse osmosis processors; the reverse osmosis processors are connected in series; and the water outlets of the N-stage reverse osmosis processors are in communication with the desalinated water storage tank.

[0014] Preferably, the filter comprises a tank body, a first filter material layer, a second filter material layer, a third filter material layer, a fourth filter material layer, a filter plate, a water inlet and a water outlet.

[0015] The filter plate is arranged at the lower part of the tank body; and the first filter material layer, the second filter material layer, the third filter material layer and the fourth filter material layer are sequentially stacked from top to bottom on the filter plate.

[0016] The water inlet is arranged opposite to the cavity of the tank body above the fourth filter material layer; and the water outlet is arranged opposite to the cavity of the tank body below the first filter material layer.

[0017] The quartz sand medium filled in the first filter material layer 241 has a particle size of 100-200 meshes, the quartz sand medium filled in the second filter material layer 242 has a particle size of 8 mm, the quartz sand medium filled in the third filter material layer 243 has a particle size of 15 mm, and the quartz sand medium filled in the fourth filter material layer 244 has a particle size of 20 mm.

[0018] Preferably, the filter comprises: a water inlet pipe, a backflow pipe, a filter water inlet valve, and a filter backflow valve; the water inlet pipe and the backflow pipe are respectively connected to the water inlet of the filter; the filter water inlet valve is arranged on the water inlet pipe; and the filter backflow valve is arranged on the backflow pipe.

[0019] Preferably, the filter comprises: a backflow pipe, a water outlet pipe, a filter backflow valve, and a filter water outlet valve; the backflow pipe and the water outlet pipe are respectively connected to the water outlet pipe line; the filter backflow valve is arranged on the backflow pipe; and the filter water outlet valve is arranged on the water outlet pipe.

[0020] Preferably, the filter comprises: a vent pipe and a filter vent valve; the vent pipe is connected to the water outlet pipe line; and the filter vent valve is arranged on the vent pipe.

[0021] Preferably, the filter comprises: a blowdown pipe; the vent pipe and the backflow pipe are respectively connected to the blowdown pipe.

[0022] Preferably, the ultrafiltration processor comprises: a second ultrafiltration processor and a first ultrafiltration processor; the water inlet of the first ultrafiltration processor is connected to the filter pipe line; the water outlet of the first ultrafiltration processor is connected to the water inlet of the second ultrafiltration processor; and the water outlet of the second ultrafiltration processor is connected to the water inlet of the filtered water storage tank.

[0023] Preferably, the reverse osmosis processor comprises: a first reverse osmosis processor and a second reverse osmosis processor; the water inlet of the first reverse osmosis processor is connected to the water outlet of the filtered water storage tank; the water outlet of the first reverse osmosis processor is connected to the water inlet of the second reverse osmosis processor; and the water outlet of the second reverse osmosis processor is connected to the water inlet of the desalted water storage tank.

[0024] Preferably, the application comprises: a plurality of pumps and a plurality of valves; the pumps and the valves are arranged on the water reservoir raw water inlet pipe at intervals.

[0025] Pumps and valves are arranged on the pipe line connecting the filter and the ultrafiltration processor at intervals.

[0026] Pumps and valves are arranged on the pipe line connecting the filtered water storage tank and the reverse osmosis processor at intervals.

[0027] Preferably, the application comprises: a plurality of blowdown valves; the blowdown valves are arranged on the blowdown pipe lines of the ultrafiltration processor and the reverse osmosis processor.

[0028] The beneficial effects that can be produced by the application include:

[0029] 1) The central water treatment filter device for producing desalted water provided by the present application can directly obtain desalted water from reservoir water after filtration, ultrafiltration treatment and reverse osmosis treatment, without using softened water as raw water, thereby reducing the amount of industrial salt used, and the water production is stable, which can meet the production needs of each link of ironmaking.

[0030] 2) The central water treatment filter device for producing desalted water provided by the present application can treat reservoir water with an inflow of 180-220 m 3 / h, a hardness of 1.5 mmol / L and a turbidity of 15-20 NTU, and obtain desalted water with a conductivity of 8-11 us / cm and a hardness of less than 0.01 mol / L after treatment. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 The device schematic diagram of the central water treatment filter device for producing desalted water in at least one embodiment provided by the present application;

[0032] Figure 2 The front view schematic diagram of the filter in at least one embodiment provided by the present application;

[0033] Figure 3 The soft water production fold line schematic diagram obtained by continuously monitoring the method in Comparative Example 1 for 2 months;

[0034] Figure 4 The desalted water production fold line schematic diagram obtained by continuously monitoring the method in Comparative Example 1 for 2 months;

[0035] Figure 5 The salt bag number fold line schematic diagram corresponding to the number of salt adding days of industrial salt using the method in Comparative Example 1 for 2 months provided by the present application; the weight of each bag of industrial salt is 50.

[0036] LEGEND

[0037] Pump 211, valve 212, blowdown valve 121, first filter 21, second filter 22, third filter 23, water inlet 221, water outlet 224, filter water inlet valve 222, filter backwash valve 223, filter back-in valve 225, filter water outlet valve 226, filter vent valve 227, blowdown pipe 231, tank 2, access port 234, first filter material layer 241, second filter material layer 242, third filter material layer 243, fourth filter material layer 244, filter plate 233, filtered water storage tank 1, second ultrafiltration treatment device 12, first ultrafiltration treatment device 11, first reverse osmosis treatment device 31, second reverse osmosis treatment device 32, desalted water storage tank 3. DETAILED DESCRIPTION

[0038] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0039] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0040] The technical means not described in detail in the present application and not used to solve the technical problems of the present application are set according to common knowledge in the art, and various common knowledge setting modes can be implemented.

[0041] Referring to Figures 1-3 The central water treatment filter device for producing desalted water provided in the present application has an inlet water flow of 180-220 m 3 / h, a hardness of 1.5 mmol / L, and a turbidity of 15-20 NTU.

[0042] After the raw water is filtered by the filter, the turbidity is less than 5 NTU, meeting the requirements of the subsequent ultrafiltration processor.

[0043] The outlet water flow of the ultrafiltration processor is 0.2-0.7 tons / hour, the outlet water conductivity of the reverse osmosis processor is 2.1-25.0 μS / cm, and the outlet water flow of the reverse osmosis processor is 0.1-0.3 tons / hour. Water treatment is performed according to the above parameters, so that the conductivity of the obtained desalted water is 8-11 us / cm, and the hardness is less than 0.01 mol / L.

[0044] The used equipment includes a plurality of pumps 211, a plurality of valves 212, a plurality of blowdown valves 121, a first filter 21, a second filter 22, a third filter 23, an inlet 221, an outlet 224, a filter inlet valve 222, a filter backwash valve 223, a filter backwash valve 225, a filter outlet valve 226, a filter vent valve 227, a blowdown pipe 231, a tank 2, an access opening 234, a first filter material layer 241, a second filter material layer 242, a filter plate 233, a filtered water storage tank 1, a second ultrafiltration processor 12, a first ultrafiltration processor 11, a first reverse osmosis processor 31, a second reverse osmosis processor 32, and a desalted water storage tank 3.

[0045] The water inlets 221 of the first filter 21, the second filter 22 and the third filter 23 are respectively connected with the water reservoir water inlet pipe, which is used for treating the water reservoir outlet water; the water reservoir water inlet pipe is provided with a raw water inlet pump, and the frequency of the raw water inlet pump is 0.38 HZ. The pump can meet the water demand of each process of the ironworks production.

[0046] The raw water in the water reservoir is treated by any one of the first filter 21, the second filter 22 or the third filter 23, and then enters the first ultrafiltration processor 11 through the pipeline connection, and is subjected to first ultrafiltration treatment, and then enters the second ultrafiltration processor 12 through the inlet of the second ultrafiltration processor 12 connected with the outlet pipeline of the first ultrafiltration processor 11, and is subjected to second ultrafiltration treatment. The treated water can be stored in the filtered water storage tank 1. According to the combing ability and situation of the subsequent section, the water is introduced into the ultrafiltration processor for treatment. The ultrafiltration processor includes the first reverse osmosis processor 31 and the second reverse osmosis processor 32. The water inlet of the first reverse osmosis processor 31 is connected with the water outlet pipeline of the filtered water storage tank 1. The water outlet of the first reverse osmosis processor 31 is connected with the water inlet of the second reverse osmosis processor 32. The water outlet of the second reverse osmosis processor 32 is connected with the water inlet of the desalted water storage tank 3. The water conductivity of the first reverse osmosis processor 31 is 25.0 μS / cm, and the water flow is 0.1 tons / hour. The water conductivity of the second reverse osmosis processor 32 is 2.1 μS / cm, and the water flow is 0.3 tons / hour. The reverse osmosis treatment is carried out according to the flow, which can ensure the stability of the desalted water flow.

[0047] The reverse osmosis processor and the ultrafiltration processor used in the application are commercially available products, which are arranged according to the commercially available products.

[0048] In a specific embodiment, the filter includes a tank body 2, an inspection opening 234, a first filter material layer 241, a second filter material layer 242, a third filter material layer 243, a fourth filter material layer 244 and a filter plate 233. The filter plate 233 is arranged in the lower part of the tank body 2. The filter plate 233 is fixedly arranged in the tank body 2, and the second filter material layer 242 is arranged on the filter plate 233. The first filter material layer 241 is arranged on the second filter material layer 242. The third filter material layer 243 is arranged on the second filter material layer 242. The fourth filter material layer 244 is arranged on the third filter material layer 243. A space is arranged between the tank body 2 and the fourth filter material layer 244 for buffering the water to be treated entering the tank body 2. The water to be treated sequentially passes through the first filter material layer 241, the second filter material layer 242, the third filter material layer 243 and the fourth filter material layer 244 under the action of water pressure, and enters the space between the lower part of the first filter material layer 241 and the tank body 2. The filter plate 233 is provided with a filter membrane capable of preventing the first filter material layer 241 from leaking, and the pore size of the specific membrane is smaller than the particle size of the filling material of the first filter material layer 241.

[0049] In a specific embodiment, the third filter material layer 243 and the fourth filter material layer 244 are filled with loose coarse sand medium to form a loose zone; the first filter material layer 241 and the second filter material layer 242 are filled with tight fine sand medium to form a tight zone; thus, the contact coagulation effect is generated by the active flow contact of the suspended substances in the raw water in the loose zone, so that the suspended substances are effectively removed; and the larger particles of the suspended substances are intercepted in the zone.

[0050] In the tight zone, the inertial collision and the adsorption effect between the suspended particles are mainly utilized to intercept the smaller particles of the suspended substances in the raw water. The biological interception capacity of the medium can effectively remove the large particles, colloids, suspended substances and the like in the water.

[0051] The quartz sand medium filled in the first filter material layer 241 has a particle size of 100-200 meshes, the quartz sand medium filled in the second filter material layer 242 has a particle size of 8 mm, the quartz sand medium filled in the third filter material layer 243 has a particle size of 15 mm, and the quartz sand medium filled in the fourth filter material layer 244 has a particle size of 20 mm.

[0052] In a specific embodiment, the filter comprises a water inlet 221 and a water outlet 224; the water inlet 221 is arranged opposite to the upper part of the first filter material layer 241 in the cavity of the tank 2; and the water outlet 224 is arranged opposite to the lower part of the filter plate 233 and the cavity surrounded by the tank 2. After the water to be treated enters from the water inlet 221, it is filtered by the filter materials and then flows out from the cavity at the lower part of the tank 2. Multiple layers of filter materials can be arranged in the filter.

[0053] In a specific embodiment, the particle size of the filter material in the first filter material layer 241 is larger than that of the filter material filled in the second filter material layer 242, so as to avoid the blockage of the first filter material layer 241. An opening is arranged at the top of the tank 2, and a cover body is detachably connected to the opening, so as to facilitate the replacement of the filter materials in the tank 2.

[0054] In a specific embodiment, a water inlet pipe and a back flushing pipe are respectively arranged in communication with the water inlet 221; and a filter water inlet valve 222 and a filter back flushing valve 223 are respectively arranged on the water inlet pipe and the back flushing pipe.

[0055] In a specific embodiment, a back inlet pipe, a water outlet pipe and a vent pipe are respectively arranged in communication with the water outlet 224; a filter back inlet valve 225 is arranged on the back inlet pipe; a filter water outlet valve 226 is arranged on the water outlet pipe; and a filter vent valve 227 is arranged on the vent pipe.

[0056] In a specific embodiment, a sewage pipe 231 is arranged; and the extension ends of the back flushing pipe and the vent pipe are in communication with the sewage pipe 231. In this way, the filter can be periodically back-flushed to maintain the filtering effect of the filter.

[0057] In a specific embodiment, it comprises at least two stages of ultrafiltration processors; the water outlets of the filters are respectively in communication with the water inlets of the first stage ultrafiltration processor; the water outlet of the first stage ultrafiltration processor is in communication with the water inlet of the second stage ultrafiltration processor; the second stage ultrafiltration processor to the N stage ultrafiltration processor are in series; for example, the filters comprise a first filter 21, a second filter 22, and a third filter 23; the water inlets of the first filter 21, the second filter 22, and the third filter 23 are respectively in communication with the water inlet pipe of the reservoir; the water outlets of the first filter 21, the second filter 22, and the third filter 23 are respectively in communication with the water inlets of the ultrafiltration processors; by arranging the first filter 21, the second filter 22, and the third filter 23, the adverse effects on the water filtration process can be avoided during any backwashing.

[0058] In a specific embodiment, the ultrafiltration processor comprises a second ultrafiltration processor 12 and a first ultrafiltration processor 11; the water outlets of the filters are in communication with the water inlets of the first ultrafiltration processor 11, and a pump 211 is arranged on the communication pipeline; the water outlet of the first ultrafiltration processor 11 is in communication with the water inlet of the second ultrafiltration processor 12; the water outlet flow rate of the first ultrafiltration processor 11 is 0.2 tons / hour; the water outlet flow rate of the second ultrafiltration processor 12 is 0.7 tons / hour.

[0059] In a specific embodiment, the second ultrafiltration processor 12 and the first ultrafiltration processor 11 comprise a blowdown pipeline, and a blowdown valve 121 is arranged on the blowdown pipeline.

[0060] In a specific embodiment, the water outlet of the second ultrafiltration processor 12 is in communication with the water inlet of the filtered water storage tank 1, and a pump 211 is arranged on the communication pipeline and is opened as needed.

[0061] In a specific embodiment, it comprises a first reverse osmosis processor 31 and a second reverse osmosis processor 32; the water outlets of the filtered water storage tank 1 are respectively in communication with the water inlets of the first reverse osmosis processor 31 and the second reverse osmosis processor 32, and a pump 211 and a valve 212 are arranged on the communication pipeline at intervals; the water outlets of the first reverse osmosis processor 31 and the second reverse osmosis processor 32 are respectively in communication with the desalted water storage tank 3; the water outlet conductivity of the first reverse osmosis processor 31 is 25.0 μS / cm, and the water outlet flow rate is 0.1 tons / hour; the water outlet conductivity of the second reverse osmosis processor 32 is 2.1 μS / cm, and the water outlet flow rate is 0.3 tons / hour.

[0062] In a specific embodiment, a blowdown valve 121 is arranged on the blowdown pipeline of the first reverse osmosis processor 31 and the second reverse osmosis processor 32, for controlling blowdown.

[0063] The device effectively improves water stability, quality compliance stability, sewage recovery water quantity and work efficiency of each workshop of Xianfu Steel after application, and stabilizes water supply reliability and saves cost of the whole group company.

[0064] The application will be further described in detail below with reference to the accompanying drawings and examples, but the application is not limited in any way by the following description. Any transformation or improvement based on the teaching of the application falls within the protection scope of the application.

[0065] Examples

[0066] The materials and instruments used in the following examples were obtained from commercial channels unless otherwise specified. The detection methods used were existing methods unless otherwise specified.

[0067] Example 1

[0068] The above device was used to treat reservoir water as raw water. The inlet flow of the reservoir water was 180-220 m 3 / h, the hardness of the inlet water was 1.5 mmol / L, and the turbidity was 15-20 NTU.

[0069] The conductivity of the desalted water obtained after treatment was 8-11 us / cm, the hardness was below 0.01 mol / L, and the yield of the desalted water was stably 100-150 tons / 1h.

[0070] Comparative Example 1

[0071] The difference from Example 1 is that the first-third filters are not used, and the obtained softened water is directly fed into the ultrafiltration processor.

[0072] The softened water yield obtained during the meter reading during the production of 2 months was produced by the method of Comparative Example 1, as shown in Table 1. Figure 3 As shown in the figure, the softened water yield exists in the case of flow interruption, which cannot meet the production needs of desalted water. The water yield of the desalted water produced by the method in Comparative Example 1 during the meter reading is shown in Table 2. Figure 4 As shown in the figure, the desalted water cannot be stably produced.

[0073] At the same time, the method in Comparative Example 1 also needs to consume a large amount of industrial salt, and the amount of industrial salt used is shown in Table 3. Figure 5 As shown in the figure, the consumption of industrial salt is high, and the production cost is high.

[0074] Although the present application has been described in detail with reference to the foregoing embodiments, the technical solutions recorded in the foregoing embodiments can be modified, or some of the technical features can be replaced by equivalent features, by those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A central water treatment filter device for desalinated water production, characterized by, Comprise: Multi-stage filter, at least two levels of ultrafiltration processor, multi-stage reverse osmosis processor; The reservoir raw water inlet pipe is in communication with the water inlet pipe of each filter; the ultrafiltration processors are connected in series; The water outlet of each filter is in communication with the water inlet pipe of the first ultrafiltration processor; The water outlet of the N-level ultrafiltration processor is in communication with the water inlet pipe of the filtered water storage tank (1); The water outlet of the filtered water storage tank (1) is in communication with the water inlet pipe of the first reverse osmosis processor; the reverse osmosis processors are connected in series, and the water outlet of the N-level reverse osmosis processor is in communication with the desalted water storage tank (3).

2. The central water treatment filter device for desalted water production according to claim 1, characterized in that, The filter comprises: Tank body (2), first filter material layer (241), second filter material layer (242), third filter material layer (243), fourth filter material layer (244), filter plate (233), water inlet (221), water outlet (224); The filter plate (233) is arranged at the lower part of the tank body (2); the first filter material layer (241), the second filter material layer (242), the third filter material layer (243) and the fourth filter material layer (244) are sequentially stacked from top to bottom on the filter plate (233); The water inlet (221) is arranged opposite to the cavity of the tank body (2) above the fourth filter material layer (244); the water outlet (224) is arranged opposite to the cavity of the tank body (2) below the first filter material layer (241); The quartz sand medium filled in the first filter material layer (241) has a particle size of 100-200 meshes, the quartz sand medium filled in the second filter material layer (242) has a particle size of 8 mm, the quartz sand medium filled in the third filter material layer (243) has a particle size of 15 mm, and the quartz sand medium filled in the fourth filter material layer (244) has a particle size of 20 mm.

3. The central water treatment filter device for desalted water production according to claim 2, characterized in that, The filter comprises: Water inlet pipe, back flushing pipe, filter water inlet valve (222), filter back flushing valve (223); The water inlet pipe and the back flushing pipe are respectively in communication with the water inlet (221) of the filter; the filter water inlet valve (222) is arranged on the water inlet pipe; and the filter back flushing valve (223) is arranged on the back flushing pipe.

4. The central water treatment filter device for desalted water production according to claim 2, characterized in that, The filter comprises: Back inlet pipe, water outlet pipe, filter back inlet valve (225), filter water outlet valve (226); The back inlet pipe and the water outlet pipe are respectively in communication with the water outlet (224); the filter back inlet valve (225) is arranged on the back inlet pipe; and the filter water outlet valve (226) is arranged on the water outlet pipe.

5. The central water treatment filter device for desalted water production according to claim 1, characterized in that, The filter comprises: Vent pipe, filter vent valve (227); the vent pipe is in communication with the water outlet (224); and the filter vent valve (227) is arranged on the vent pipe.

6. The central water treatment filter device for desalted water production according to claim 3 or 5, characterized in that, The filter comprises: Sewage pipe (231); the vent pipe and the back flushing pipe are respectively in communication with the sewage pipe (231).

7. The central water treatment filter device for desalted water production according to claim 1, characterized in that, The ultrafiltration processor comprises: a second ultrafiltration processor (12) and a first ultrafiltration processor (11); the water inlet of the first ultrafiltration processor (11) is in communication with the filter; the water outlet of the first ultrafiltration processor (11) is in communication with the water inlet of the second ultrafiltration processor (12); and the water outlet of the second ultrafiltration processor (12) is in communication with the water inlet of the filtered water storage tank (1).

8. The central water treatment filter device for desalted water production according to claim 1, characterized in that, The reverse osmosis processor comprises a first reverse osmosis processor (31) and a second reverse osmosis processor (32); the water inlet of the first reverse osmosis processor (31) is in pipeline communication with the water outlet of the filtered water storage tank (1); the water outlet of the first reverse osmosis processor (31) is in pipeline communication with the water inlet of the second reverse osmosis processor (32); and the water outlet of the second reverse osmosis processor (32) is in pipeline communication with the water inlet of the desalted water storage tank (3).

9. The central water treatment filter device for desalted water production according to claim 1, characterized in that, It comprises: a plurality of pumps (211) and a plurality of valves (212); the pumps (211) and the valves (212) are arranged at intervals on the raw water inlet pipe of the reservoir; pumps (211) and valves (212) are arranged at intervals on the pipeline through which the filter and the ultrafiltration processor are in communication; pumps (211) and valves (212) are arranged at intervals on the pipeline through which the filtered water storage tank (1) and the reverse osmosis processor are in communication.

10. The central water treatment filter device for desalted water production according to claim 1, characterized in that, It comprises: a plurality of blowdown valves (121); the blowdown valves (121) are arranged on the blowdown pipelines of the ultrafiltration processor and the reverse osmosis processor.

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