CN212269812U - Membrane concentrated water crystallizer and reverse osmosis concentrated water treatment device - Google Patents

Abstract

The disclosure relates to the technical field of water treatment, in particular to a membrane concentrated water crystallizer and a reverse osmosis concentrated water treatment device. The membrane concentrated water crystallizer comprises a shell, wherein an end cover is arranged at the top of the shell, the bottom end of the shell is conical, and a discharge hole and a discharge port are formed in the bottom end of the shell; the overflow weir is arranged at the top end of the shell, and a water outlet is arranged on the outer side of the overflow weir; the guide cylinder is arranged in the shell and is coaxial with the shell; the seed crystal feeding device is arranged on the end cover, and a feeding port of the seed crystal feeding device is positioned above the guide shell. The stirrer is arranged at the bottom of the guide cylinder and is connected with the driving mechanism through a stirring shaft; the feed pipe penetrates through the shell and extends into the guide cylinder; wherein, along the direction from the casing to the draft tube, the inlet pipe towards the bottom slope of casing makes in dense water directly adds the draft tube, reduces the possibility that the inlet pipe blockked up.

Description

Membrane concentrated water crystallizer and reverse osmosis concentrated water treatment device

Technical Field

The disclosure relates to the technical field of water treatment, in particular to a membrane concentrated water crystallizer and a reverse osmosis concentrated water treatment device.

Background

In the water treatment industry, reverse osmosis is widely applied due to the outstanding advantages of low energy consumption, simple and convenient operation, low operation cost and the like. However, reverse osmosis technology produces high quality desalinated water while the impurities in the feed water are highly concentrated. If the reverse osmosis concentrated water cannot be properly treated and is directly discharged, the reverse osmosis concentrated water inevitably has adverse effects on soil, surface water, marine environment and the like.

The common treatment methods for reverse osmosis concentrated water plants include: concentrated water is directly discharged into the ocean, surface water is directly discharged into the ocean, deep well injection, resource utilization, a Fenton method, membrane distillation and the like, but the reverse osmosis concentrated water is not effectively utilized by the methods, and harmlessness and resource utilization of the concentrated water are not realized. The crystal seed method is characterized in that crystal seeds are added into a liquid phase to form crystal nuclei, so that the growth of isomer crystals with the same crystal form configuration as the crystal seeds is promoted, and the purpose of separating salt in the liquid phase is achieved. The guide shell crystallizer is a common device for a crystal seed method, and has the advantages of high heat transfer efficiency, simple configuration and convenient operation and control. The guide shell is provided with a cooler, which can accelerate the growth rate of the crystal and is difficult to completely eliminate the existence of fine crystals in the supernatant.

In the prior art, the seed crystal feeding device is arranged at an inlet pipeline of a crystallizer, so that the pipeline is easy to block. The supersaturated solution is in a metastable state, and when the seed crystal is added into the pipeline, turbulent flow can be generated, so that the metastable state is influenced, and the growth of crystals is not facilitated. And fine grains in a clarification zone at the upper part of the crystallizer cannot be completely eliminated, so that the effluent quality is influenced.

Disclosure of Invention

In order to solve the above technical problems or at least partially solve the above technical problems, the present disclosure provides a membrane concentrated water crystallizer and a reverse osmosis concentrated water treatment apparatus

The first aspect of the disclosure provides a membrane concentrated water crystallizer, which comprises a shell, wherein the top of the shell is provided with an end cover, the bottom of the shell is conical, and the bottom of the shell is provided with a discharge hole and a discharge port;

the overflow weir is arranged at the top end of the shell, and a water outlet is formed in the outer side of the overflow weir;

the guide cylinder is arranged in the shell and is coaxial with the shell;

and the crystal seed feeding device is arranged on the end cover, and a feeding port of the crystal seed feeding device is positioned above the guide shell.

The stirrer is arranged at the bottom of the guide cylinder and is connected with the driving mechanism through a stirring shaft;

the feeding pipe penetrates through the shell and extends into the guide cylinder;

wherein the feed pipe is inclined toward the bottom of the housing in a direction from the housing to the guide shell.

In one possible design, the included angle β between the feeding pipe and the axial direction of the guide cylinder satisfies: beta is more than or equal to 45 degrees and less than or equal to 60 degrees.

In one possible design, the bottom of the end cap is provided with an annular baffle plate extending from the bottom of the end cap towards the bottom of the housing;

an inclined pipe is arranged between the annular baffle and the shell.

In one possible design, the inclined tube and the guide cylinder are axially arranged at an included angle theta which satisfies the following condition: theta is more than or equal to 45 degrees and less than or equal to 60 degrees.

In one possible design, the length L of the chute satisfies: l is more than or equal to 0.8m and less than or equal to 1 m;

or, the height H of the inclined tube in the axial direction satisfies the following condition: h is more than or equal to 0.5m and less than or equal to 1 m.

In one possible design, the stirrer comprises a blade, and the length of the blade is 1/2-2/3 of the diameter length of the guide shell.

In one possible design, the end cover is provided with an electronic liquid level meter, and the electronic liquid level meter is used for controlling the liquid level height of the feed liquid in the guide cylinder.

The second aspect of the disclosure provides a reverse osmosis concentrated water treatment device, which comprises the membrane concentrated water crystallizer;

the feed inlet of the thickener is communicated with the discharge outlet of the membrane concentrated water crystallizer;

the feed inlet of the centrifuge is communicated with the discharge outlet of the thickener;

the water inlet of the concentration system is communicated with the water outlet of the centrifuge;

the feed inlet of circulating pump with the delivery port intercommunication of concentrated system, the discharge gate of circulating pump with the inlet pipe intercommunication.

In a possible design, a flow meter and a solenoid valve are arranged on a pipeline of the circulating pump communicated with the feeding pipe.

In one possible design, the reverse osmosis concentrated water treatment device further comprises:

the input port of the first deep oxidation unit is communicated with the water outlet of the membrane concentrated water crystallizer;

the input port of the first biological aerated filter is communicated with the output port of the first deep oxidation unit;

the input port of the second deep oxidation unit is communicated with the output port of the first biological aerated filter;

and the input port of the second biological aerated filter is communicated with the output port of the second deep oxidation unit.

Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages:

the concentrated dense water crystallizer of membrane that this disclosed embodiment provided is through adding the seed crystal in dense water, under the effect of agitator, the seed crystal fully contacts with supersaturated solution, forms the crystal large granule, depends on the inner wall growth along the draft tube at the draft tube inner wall to subside to the draft tube outer wall from the top of draft tube inner wall, great crystal granule subsides to concentrated dense water crystallizer bottom of membrane, collects the discharge from concentrated dense water crystallizer bottom discharge gate of membrane. Such crystallization process greatly increases the salting-out rate. The feed inlet of the seed crystal feeding device is positioned above the guide shell to prevent the pipeline from being blocked. The feed pipe passes through the shell and stretches into the guide shell, and the feed pipe inclines towards the bottom of the shell along the direction from the shell to the guide shell, so that concentrated water can be directly added into the guide shell, and the possibility of blockage of the feed pipe is reduced.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.

In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present disclosure, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.

FIG. 1 is a schematic structural diagram of a membrane-concentrated brine crystallizer according to an embodiment of the disclosure;

fig. 2 is a schematic cross-sectional view of the installation of the chute of fig. 1.

FIG. 3 is a schematic view of a first structure of a reverse osmosis concentrated water treatment device according to an embodiment of the disclosure;

FIG. 4 is a schematic view of a second structure of a reverse osmosis concentrated water treatment device according to an embodiment of the disclosure;

fig. 5 is a schematic diagram of a specific structure of a membrane-concentrated water crystallizer according to an embodiment of the present disclosure.

Reference numerals:

1-end cap;

2-an overflow area;

3-water outlet;

4-inclined tube;

5-a crystalline region;

6-a sight glass hole;

7-a middle shell;

8, sealing the shell;

9-a housing;

10-a discharge hole;

11-discharging a clean mouth;

12-a drive mechanism;

13-a stirrer;

14-a reaction zone;

15-feed pipe;

16-a guide shell;

17-an overflow weir;

18-an annular baffle;

19-a seed crystal feeding device;

20-an electronic level gauge;

30-membrane concentration concentrated water crystallizer;

31-a first deep oxidation unit;

32-a first biological aerated filter;

33-a second deep oxidation unit;

34-a second biological aerated filter;

35-a thickener;

36-a centrifuge;

37-a concentration system;

38-circulation pump;

40-electromagnetic valve;

41-flow meter.

Detailed Description

In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced in other ways than those described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.

FIG. 1 is a schematic structural diagram of a membrane-concentrated brine crystallizer according to an embodiment of the disclosure; fig. 2 is a schematic cross-sectional view of the installation of the chute of fig. 1. As shown in fig. 1, a membrane concentrated brine crystallizer 30 provided by the embodiment of the present disclosure includes a housing 9, an end cap 1 is disposed at the top of the housing 9, the bottom end of the housing 9 is tapered, a discharge port 10 and a purge port 11 are disposed at the tapered bottom end, the discharge port 10 is used for outputting crystals, and the purge port 11 is used for emptying the membrane concentrated brine crystallizer.

The guide shell 16 is arranged in the shell 9, the guide shell 16 is coaxial with the shell 9, and the guide shell 16 and the shell 9 can be fixedly connected through a support and can also be connected through other modes. The area enclosed by the guide shell 16 forms a reaction zone 14, and the reaction zone 14 is located at the right center inside the shell 9. The area between the outside of the draft tube 16 and the housing 9 forms the crystallization zone 5. The overflow weir 17 is arranged at the top end of the shell 9 to form an overflow area 2, the overflow area 2 is positioned above the whole shell 9, and the outer side of the overflow weir 17 is provided with a water outlet 3 for outputting clear liquid treated by the membrane concentration concentrated water crystallizer 30. Optionally, the overflow weir 17 may be a tooth-shaped weir, and when the liquid is lower than the top of the tooth-shaped weir, the tooth-shaped weir only plays a role in blocking the liquid; if the concentrated water is continuously added, when the water level is higher than the weir crest of the tooth-shaped weir, the water overflows from the weir crest. The water is lifted by the tooth-shaped weir, most of the suspended crystals are blocked in front of the tooth-shaped weir plate, and the liquid water flowing through the tooth-shaped weir is relatively clean, so that the aim of purifying the water is fulfilled.

The seed crystal feeding device 19 is arranged on the end cover 1, and a feeding port of the seed crystal feeding device 19 is positioned at the top of the guide shell 16, so that when the seed crystal feeding device is used, the feeding port of the seed crystal feeding device 19 is positioned right above the guide shell 16, and a pipeline is prevented from being blocked. The seed crystal feeding device 19 extends to a position below the end cover 1, so that the seed crystal can smoothly enter the reaction zone 14, and the seed crystal is prevented from diffusing to other areas to influence the induced crystallization effect of the crystal in the metastable zone and influence the crystallization effect. Optionally, the seed crystal feeding device 19 is installed at the upper end cover 1 of the draft tube 16, and extends into the membrane concentrated water crystallizer 30, the extension length is about 500 mm-700 mm, and the feeding port is located right above the draft tube 16. The seed crystal feeding device 19 may include a seed crystal storage tank, a feeding pump and a control valve connected in sequence, wherein the control valve is used for controlling the feeding amount and the feeding frequency of the seed crystal.

The stirrer 13 is arranged at the bottom of the guide shell 16, and the stirrer 13 is connected with the driving mechanism 12 through a stirring shaft. Agitator 13 is installed under draft tube 16, and agitator 13 sets up in draft tube 16 bottom promptly, more is favorable to the macro-scale and the micro-mixing of dense water and seed crystal, the local supersaturation in control bottom to in control crystal nucleation rate, obtain the crystal of required granularity, it is more convenient to the equipment washing in later stage simultaneously. Wherein the drive mechanism may be a motor.

In a particular embodiment, the stirrer 13 comprises blades in the form of: straight paddle, propeller, trilobal or frame, etc. The length of the paddle is 1/2-2/3 of the diameter and the length of the guide shell 16, the rotating speed of the paddle is set to be 150-300 r/min, macro and micro mixing of concentrated water and seed crystals is facilitated, and the over-high local supersaturation degree of the bottom is controlled, so that the nucleation rate of crystals is controlled, and crystals with required granularity are obtained.

The feed pipe 15 penetrates the housing 9 and extends into the guide shell 16, the feed pipe 15 comprises a concentrated water feed port, and the feed pipe 15 is inclined towards the bottom of the housing 9 in the direction from the housing 9 to the guide shell 16. The concentrated water is directly added into the guide shell 16, and the crystal seeds are fully contacted with the concentrated water in the guide shell 16, so that the particle size of the particles is increased, and the salt separation in the concentrated water is promoted.

The membrane concentration concentrated water crystallizer 30 disclosed by the embodiment of the disclosure has a simple and clear structure, all the partitions are closely connected, required components are convenient to replace, and later-period equipment maintenance is facilitated.

In a specific embodiment, the angle β between the feeding pipe 15 and the guide shell 16 in the axial direction satisfies: beta is more than or equal to 45 degrees and less than or equal to 60 degrees. The concentrated water is directly added into the guide shell 16, and the crystal seeds are fully contacted with the concentrated water in the guide shell 16, so that the particle size of the particles is increased, and the salt separation in the concentrated water is promoted.

In a specific embodiment, the bottom of the end cover 1 is provided with an annular baffle 18, the annular baffle 18 extends from the bottom of the end cover 1 towards the shell 9, and the inclined tube 4 is arranged between the annular baffle 18 and the shell 9. The overflow area 2 is positioned above the whole crystallization device, an annular cavity area is formed between the annular baffle and the shell 9, and the annular baffle 18 is fixed below the end cover 1 and positioned between the outer side of the guide cylinder 16 and the inner side of the shell 9. An annular baffle 18 separates the overflow zone 2 from the crystallization zone 5. The inclined tube 4 is arranged between the annular baffle 18 and the shell 9, so that the condition that fine crystals are suspended in the clear liquid can be improved. Meanwhile, the crystallization speed and the crystal size can be controlled by controlling and adjusting the rotating speed of the blades, and the effective desalination rate of the strong brine reaches 55-65%.

Optionally, the overflow area 2 comprises: the inclined pipe 4, the annular baffle 18 and the overflow weir 17. The inclined tube 4 is arranged in an annular cavity area formed between the outer wall of the shell 9 and the shielding plate. The inclined tube 4 is composed of a plurality of hexagonal inclined tubes 4. The inclined tube 4 can be arranged between the annular baffle 18 and the shell 9 through a bracket, can be detachably connected with the bracket, and can also be fixedly connected with the bracket. The inclined tube 4 can be made of the following materials: polypropylene or polyvinyl chloride. The length L of the inclined tube 4 satisfies that: l is more than or equal to 0.8m and less than or equal to 1m, or the height H of the inclined tube 4 in the axial direction meets the following requirements: h is more than or equal to 0.5m and less than or equal to 1 m. That is, the length of the inclined tube 4 may be 0.8m to 1m, and the installation height may be 0.5m to 1 m. The installation angle of the inclined tube 4 is 45-60 degrees, so that the inclined tube 4 can effectively retain suspended crystal particles suspended in a liquid phase, larger particles formed among the crystal particles are favorably deposited after being attached to the surface of the inclined tube 4, the salt content in the upper clarified liquid is reduced, and the TDS (total dissolved solids) of the effluent is reduced.

Preferably, the inclined tube 4 and the guide cylinder 16 have an axial included angle θ satisfying: theta is more than or equal to 45 degrees and less than or equal to 60 degrees, can effectively retain suspended crystal particles suspended in the liquid phase, and is beneficial to forming larger particles among the crystal particles to be attached to the surface of the inclined tube 4 for sedimentation, thereby reducing the salt content in the supernatant liquid and reducing the total dissolved solids of TDS of the effluent.

The crystallization area 5 comprises an end cover 1 and a shell 9, wherein the end cover 1 is provided with an electronic liquid level meter 20, and the electronic liquid level meter 20 is used for controlling the liquid level height of the feed liquid in the guide cylinder 16. Optionally, electronic level gauge 20 can adopt the radar level gauge for the liquid level height of the inside feed liquid of control crystallization zone 5 prevents to cause the average dwell time of feed liquid to shorten because of casing 9 feed liquid is too much, influences the crystallization separation effect. The electronic level gauge 20 further improves the artificial intelligence of the device. The middle upper part of the outer side of the shell 9 is provided with a sight glass hole 6, which is beneficial to observing the crystallization degree of the shell material at any time.

This embodiment is through utilizing "seed crystal method" crystallization technique to separate salinity in the dense water, through adding the seed crystal in the dense water, under the effect of agitator 13, the seed crystal fully contacts with supersaturated solution, form the crystal large granule, and depend on 16 inner walls of draft tube and grow along 16 inner walls of draft tube, turn to the outer wall of draft tube 16 after along 16 outer walls of draft tube from the top of 16 inner walls of draft tube and subside, great crystal grain subsides to membrane concentration dense water crystallizer 30 bottom, after partial suspension crystal grain in liquid blocks through the pipe chute 4 of ring chamber district, the gathering that the crystal grain can be better adsorbs together, form the large granule and subside to membrane concentration dense water crystallizer 30 bottom, collect the discharge from membrane concentration dense water crystallizer 30 bottom discharge gate 10 and discharge. Such crystallization process greatly increases the salting-out rate. The experimental result shows that the calcium sulfate salt yield can reach 62% through the treatment of the membrane concentration concentrated water crystallizer 30 with the structure.

Fig. 3 is a first structural schematic diagram of a reverse osmosis concentrated water treatment device according to an embodiment of the present disclosure, and fig. 4 is a second structural schematic diagram of the reverse osmosis concentrated water treatment device according to the embodiment of the present disclosure.

The reverse osmosis concentrated water treatment device provided by the embodiment of the disclosure can be used for a calcium sulfate crystallization system. As shown in fig. 3, the reverse osmosis concentrated water treatment apparatus provided by the embodiment of the present disclosure includes a membrane concentrated water crystallizer 30, a thickener 35, a centrifuge 36, and a concentration system 37. The feed inlet of the thickener is communicated with the discharge outlet of the membrane concentrated water crystallizer 30, the feed inlet of the centrifuge 36 is communicated with the discharge outlet of the thickener, the water inlet of the concentration system 37 is communicated with the water outlet of the centrifuge 36, the feed inlet of the circulating pump 38 is communicated with the water outlet of the concentration system 37, and the discharge outlet of the circulating pump 38 is communicated with the feed pipe 15. The concentration system 37 may be an electrodialysis concentration or an evaporator concentration. The crystallization process of the reverse osmosis concentrated water treatment device can be continuously and stably carried out under constant flow, temperature and supersaturation degree, and the requirements of batch crystallization and continuous crystallization processes can be met.

In a specific embodiment, a flow meter 41 is disposed on the pipeline of the circulating pump 38 communicating with the feeding pipe 15, and a solenoid valve 40 is disposed on the pipeline of the feeding pipe 15 communicating with the feeding port of the circulating pump 38.

The reverse osmosis concentrated water treatment device provided by the embodiment of the disclosure can be used for a continuous crystallization system. As shown in FIG. 4, the continuous crystallization system comprises a membrane concentration concentrated water crystallizer 30, a thickener, a centrifuge 36, a concentration system 37, a first deep oxidation unit 31, a first biological aerated filter 32, a second deep oxidation unit 33 and a second biological aerated filter 34. The first and second deep oxidation units 31 and 33 may deeply oxidize the reactor.

The feed inlet of the thickener is communicated with the discharge outlet of the membrane concentrated water crystallizer 30, the feed inlet of the centrifuge 36 is communicated with the discharge outlet of the thickener, the water inlet of the concentration system 37 is communicated with the water outlet of the centrifuge 36, the feed inlet of the circulating pump 38 is communicated with the water outlet of the concentration system 37, and the discharge outlet of the circulating pump 38 is communicated with the feed pipe 15.

The input port of the first deep oxidation unit 31 is communicated with the water outlet of the membrane concentrated water crystallizer 30, the input port of the first biological aerated filter 32 is communicated with the output port of the first deep oxidation unit 31, the input port of the second deep oxidation unit 33 is communicated with the output port of the first biological aerated filter 32, and the input port of the second biological aerated filter 34 is communicated with the output port of the second deep oxidation unit 33, so that the requirements of intermittent crystallization and continuous crystallization processes can be met.

The crystallization process of the continuous crystallization system is continuously and stably carried out under the conditions of constant flow, temperature and supersaturation degree. The operation process of the continuous membrane concentrated water crystallizer 30 is as follows:

the concentrated water is sent into the guide shell 16 of the membrane concentrated water crystallizer 30 for crystallization through the circulating pump 38, and the stirring speed of the stirrer 13 is controlled to ensure that the supersaturated state of the concentrated water is in a metastable zone. Meanwhile, seed crystals are continuously and quantitatively added from a seed crystal adding device 19, concentrated water is discharged from a discharge hole at the bottom of a shell 9 of the membrane concentrated water crystallizer 30 after the crystallization process is finished in a crystallization area 5 of the membrane concentrated water crystallizer 30, and is thickened in a thickener 35, solid-liquid separation is carried out through a centrifugal machine 36, wet materials obtained after separation are sent to a subsequent working section for treatment, the obtained mother liquor is sent to a concentration system 37 to be concentrated to a certain concentration and is mixed with fresh concentrated water, and the mixture is sent to the membrane concentrated water crystallizer 30 for crystallization through a circulating pump 38, and the circulation is carried out, so that a continuous crystallization process is formed.

Fig. 5 is a schematic diagram of a specific structure of a membrane-concentrated water crystallizer 30 according to an embodiment of the present disclosure, and the structural parameters thereof are as follows:

the inner diameter D1 of the annular baffle 18 is 5200mm, the height L1 of the top shell 9 is 2500mm, the installation height L2 of the inclined tube 4 is 500mm, the inner diameter D2 of the guide shell 16 is 1400mm, the inner diameter D3 of the middle shell 7 is 5000mm, the height L3 of the middle shell 7 is 3500mm, the first contraction angle α is 60 °, the included angle β between the center line of the feed tube 15 and the center line of the membrane concentrated water crystallizer 30 is 60 °, the height L4 of the shell end enclosure 8 is 2600mm, the taper γ of the shell end enclosure 8 is 60 °, and the total height L5 of the membrane concentrated water crystallizer 30 is 11400 mm.

In this embodiment, the temperature of the supersaturated mother liquor in the membrane concentrated water crystallizer 30 and the draft tube 16 is 25 ℃, and the feed flow rate is as follows: 4m³And h, the content of calcium sulfate in the supersaturated mother liquor is 3300 mg/L. The operation of this example is as follows: the supersaturated mother liquor is metered by a flowmeter 41 under the action of a circulating pump 38 and then sent to a membrane concentration concentrated water crystallizer 30. And meanwhile, seed crystals are added into the guide shell 16 through a seed crystal adding device 19, after crystallization is carried out for 1.5h, the crystallized clear liquid is continuously discharged from a water outlet 3 at the top of the membrane concentrated water crystallizer 30, and the content of calcium sulfate in the clear liquid is 1230 mg/L. The concentrated phase of crystallization is continuously discharged from the discharge port to the thickener 35 for salt separation treatment.

In summary, the present disclosure has the following advantages:

1. the membrane concentration concentrated water crystallizer has no refrigeration or heating equipment, and has the advantages of simple structure, convenience in installation, good crystallization particle settling effect, low energy consumption, low operation energy consumption and convenience in maintenance.

2. The membrane concentrated water crystallizer disclosed by the disclosure is combined with other equipment, and can meet the requirements of batch crystallization and continuous crystallization processes.

3. The inclined tube is adopted in the membrane concentration concentrated water crystallizer, so that suspended crystal particles suspended in a liquid phase can be effectively intercepted, and the condition that fine crystals are suspended in a clear liquid is improved. Meanwhile, the crystallization speed and the crystal size are controlled by controlling and adjusting the rotating speed of the blades, and the effective desalination rate of the strong brine reaches 55-65%.

It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The foregoing are merely exemplary embodiments of the present disclosure, which enable those skilled in the art to understand or practice the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A membrane concentration concentrated water crystallizer is characterized by comprising a shell (9), wherein the top of the shell is provided with an end cover (1), the bottom of the shell is conical, and the bottom of the shell is provided with a discharge hole (10) and a clean discharge hole (11);

the overflow weir (17) is arranged at the top end of the shell (9), and a water outlet (3) is arranged on the outer side of the overflow weir (17);

the guide cylinder (16) is arranged in the shell (9) and is coaxial with the shell (9);

a seed crystal feeding device (19) arranged on the end cover (1), wherein a feeding port of the seed crystal feeding device (19) is positioned above the guide shell (16),

the stirrer (13) is arranged at the bottom of the guide shell (16) and is connected with the driving mechanism (12) through a stirring shaft;

a feed pipe (15) penetrating through the shell (9) and extending into the guide cylinder (16);

wherein the feed pipe (15) is inclined towards the bottom of the housing (9) in a direction from the housing (9) to the guide shell (16).

2. The membrane-concentrated-water crystallizer as claimed in claim 1, characterized in that the angle β between the feeding pipe (15) and the axial direction of the guide shell (16) is such that: beta is more than or equal to 45 degrees and less than or equal to 60 degrees.

3. A membrane concentrated water crystallizer according to claim 1, characterized in that the bottom of the end cap (1) is provided with an annular baffle (18), said annular baffle (18) extending from the end cap (1) towards the bottom of the shell (9);

an inclined tube (4) is arranged between the annular baffle (18) and the shell (9).

4. The membrane-concentrated water crystallizer as claimed in claim 3, wherein the angle θ between the inclined tube (4) and the axial direction of the guide cylinder (16) satisfies the following condition: theta is more than or equal to 45 degrees and less than or equal to 60 degrees.

5. A membrane concentrated water crystallizer according to claim 4, characterized in that the length L of said inclined tubes (4) satisfies: l is more than or equal to 0.8m and less than or equal to 1 m;

or the height H of the inclined tube (4) in the axial direction satisfies the following condition: h is more than or equal to 0.5m and less than or equal to 1 m.

6. The membrane-concentration concentrated water crystallizer as claimed in claim 1, wherein the stirrer (13) comprises a blade, and the length of the blade is 1/2-2/3 of the diameter length of the guide cylinder (16).

7. The membrane concentrated water crystallizer according to claim 1, wherein the end cap (1) is provided with an electronic liquid level meter (20), and the electronic liquid level meter (20) is used for controlling the liquid level height of the feed liquid in the guide cylinder (16).

8. A reverse osmosis concentrate treatment plant, characterized by comprising a membrane concentrate crystallizer (30) according to any one of claims 1 to 7;

a thickener (35), wherein a feed inlet of the thickener (35) is communicated with a discharge outlet (10) of the membrane concentrated water crystallizer (30);

a centrifuge (36), wherein the feed inlet of the centrifuge (36) is communicated with the discharge outlet of the thickener (35);

a concentration system (37), wherein a water inlet of the concentration system (37) is communicated with a water outlet of the centrifuge (36);

a circulating pump (38), the feed inlet of circulating pump (38) with delivery port (3) intercommunication of concentrated system (37), the discharge gate of circulating pump (38) with inlet pipe (15) intercommunication.

9. A reverse osmosis concentrated water treatment device according to claim 8, wherein a flow meter (41) and a solenoid valve (40) are arranged on a pipeline of the circulating pump (38) communicated with the feeding pipe (15).

10. A reverse osmosis concentrated water treatment apparatus according to claim 8, further comprising:

the input port of the first deep oxidation unit (31) is communicated with the water outlet (3) of the membrane concentrated water crystallizer;

a first biological aerated filter (32), wherein the input port of the first biological aerated filter (32) is communicated with the output port of the first deep oxidation unit (31);

a second deep oxidation unit (33), wherein the input port of the second deep oxidation unit (33) is communicated with the output port of the first biological aerated filter (32);

and the input port of the second biological aerated filter (34) is communicated with the output port of the second deep oxidation unit (33).

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