Water treatment device and method for high-salt and high-cod wastewater

Abstract

The application discloses a kind of high salt high COD wastewater water treatment device and method, it is related to wastewater treatment technical field;The application includes: evaporation cylinder, it is provided with baffle in it, it is used to separate evaporation cylinder into upper and lower distribution storage cavity and heating cavity, heating cavity is provided with heating part, the heating part includes the heating rod that is set in heating cavity, a plurality of heating cylinders are fixed on the heating rod and are concentrically distributed, and the electric heating rod is arranged in the heating rod;The evaporation cylinder of the application is divided into storage cavity and heating cavity by baffle, wastewater is first added into storage cavity, wastewater is sprayed on a plurality of heating cylinders by water distribution member, wastewater flows down in thin water film on the inner and outer walls of heating cylinder, double-sided heating evaporation is carried out, heat transfer area is greatly improved, heating efficiency is improved, at the same time, wastewater circulates in the form of thin water film, can be washed on the surface of heating cylinder, water film continuously updates boundary layer, inhibits scale formation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wastewater treatment, in particular to a water treatment device and method for high-salt and high-COD wastewater. BACKGROUND

[0002] High-salt wastewater refers to wastewater with a mass fraction of total dissolved solids greater than or equal to 3.5%. It mainly comes from domestic water, food processing, metallurgy, chemical industry, oil and gas exploration, etc. If directly discharged into water bodies, it will cause varying degrees of harm to aquatic organisms, domestic water and industrial and agricultural water. Therefore, it needs to be treated by a water treatment device. The most widely used high-salt wastewater treatment currently usually uses evaporation crystallization. By heating and evaporating the wastewater, the salt-containing wastewater is concentrated, and the salt and water are finally separated.

[0003] When the existing evaporation device heats and evaporates salt-containing wastewater, part of the high-salt components will adhere to the inner wall of the equipment during the heating process, thus forming scale. The scale forms a heat insulation layer, and the thermal conductivity of the scale layer is much lower than that of metal, which hinders heat transfer and affects the heating and evaporation efficiency. At the same time, as the scale layer thickens, local overheating will become more serious and widespread. Continuous heating and high temperature provide more favorable conditions (higher reaction rate) for under-scale corrosion, which may cause the equipment to leak rapidly and be damaged.

[0004] For example, the "high-salt wastewater treatment device for industrial production" disclosed in Chinese invention patent (publication number: CN118877985B) has the following disclosure in the specification: the existing high-salt wastewater treatment will form scale on the inner wall of the equipment during the heating process, and the scale will easily cause corrosion of the inner wall of the equipment.

[0005] The above patent can prove the defects of the prior art, and therefore the present application proposes a water treatment device and method for high-salt and high-COD wastewater. SUMMARY

[0006] The present application aims to solve the problems in the background art. The present application provides a water treatment device and method for high-salt and high-COD wastewater.

[0007] To achieve the above-mentioned purpose, the present application specifically adopts the following technical solutions:

[0008] One of the purposes of the present application is to provide a water treatment device for high-salt and high-COD wastewater, which comprises:

[0009] The evaporation cylinder is provided with a partition plate inside, which is used to separate the evaporation cylinder into upper and lower storage cavities and heating cavities. The heating cavities are provided with heating elements, which include heating rods arranged in the heating cavities. The heating rods are fixed with a plurality of concentric heating cylinders. The heating rods are provided with electric heating rods. The heating cylinders are provided with electric heating wires connected with the electric heating rods. The partition plate is communicated with water distribution elements, which are used to spray wastewater to the inner and outer walls of the plurality of heating cylinders. The storage cavities and the heating cavities are communicated with return pipes, and the return pipes are communicated with first water pumps arranged on the evaporation cylinder.

[0010] The condensing cylinder is arranged on one side of the evaporation cylinder. The condensing cylinder is communicated with the heating cavities through a conveying pipe. The condensing cylinder is provided with condensing elements.

[0011] Further, the water distribution elements include a main pipe rotatingly communicated with the bottom of the partition plate. The end of the main pipe is communicated with a plurality of auxiliary pipes. The auxiliary pipes are communicated with a plurality of U-shaped pipes. The plurality of U-shaped pipes are respectively corresponding to the plurality of heating cylinders. The inner bends of the U-shaped pipes are communicated with nozzles. A rotating shaft is arranged on the evaporation cylinder. One end of the rotating shaft is drivingly connected with the main pipe through a bevel gear assembly. The other end of the rotating shaft is connected with a motor arranged on the evaporation cylinder.

[0012] Further, the partition plate is communicated with a first sleeve. The main pipe is rotatingly communicated with the first sleeve. The top end of the main pipe is fixed with a shaft through a support rod. The shaft is provided with a plurality of annularly distributed blades.

[0013] Further, the bottom end of the evaporation cylinder is communicated with a second sleeve. The end of the second sleeve is provided with a gate valve. The return pipe is communicated with the second sleeve. A filter screen is slidingly arranged in the second sleeve. The filter screen and the gate valve are connected with a spring.

[0014] Further, a rotating shaft is rotatingly penetrated through the evaporation cylinder. The rotating shaft is fixed with a cam. The convex end of the cam is intermittently matched with the filter screen. The rotating shaft and the rotating shaft are drivingly connected through a belt pulley assembly.

[0015] Further, the main pipe is fixed with a mounting bracket. The mounting bracket is fixed with a breaking screen.

[0016] Further, the conveying pipe is communicated with a steam compressor. The conveying pipe has a spiral section and the spiral section penetrates through the storage cavity. One end of the return pipe located in the storage cavity is communicated with a ring pipe. The ring pipe is communicated with a plurality of injection pipes.

[0017] Further, the condensing elements include a cooling box arranged on the outer wall of the condensing cylinder. The cooling box is communicated with two water pipes. The ends of the two water pipes are communicated with spiral pipes located in the condensing cylinder. One of the water pipes is communicated with a second water pump arranged on the cooling box.

[0018] Further, a spiral plate is fixed in the condensing cylinder for forming a spiral channel, and the spiral pipe is located in the spiral channel.

[0019] The second object of the present application provides a water treatment method for high-salt and high-COD wastewater, which has the following steps:

[0020] S1: the salt-containing wastewater is added into the storage cavity, the wastewater is uniformly sprayed on the inner and outer walls of the plurality of heating cylinders through the water distribution member, the wastewater flows downward along the inner and outer walls of the heating cylinders in the form of a water film and is collected at the bottom of the storage cavity, and the first water pump works to return the wastewater in the storage cavity to the storage cavity through the return pipe, thereby forming a water flow circulation;

[0021] S2: the electric heating rods and the electric heating wires are powered on to heat the heating rods and the heating cylinders respectively, the heat is conducted to the flowing water film, the wastewater generates steam after being heated, the steam flows upward along the airflow annular channels formed by the adjacent heating cylinders, and the concentrated liquid and the salt crystals are retained at the bottom of the heating cavity after the wastewater is circulated and heated to evaporate;

[0022] S3: the steam generated by heating is transported to the steam compressor through the conveying pipe, the steam compressor compresses and heats the steam, the heated steam first flows through the storage cavity through the spiral section flow path, preheats the wastewater in the storage cavity, and then flows to the condensing cylinder after heat exchange, and is condensed through the condensing member;

[0023] S4: when the heat-exchanged steam flows into the condensing cylinder, the second water pump works to transport the refrigerated cooling liquid in the cooling tank to the spiral pipe through one of the water pipes and return to the cooling tank through the other water pipe, the steam is condensed when contacting the spiral pipe, the condensed water is retained in the condensing cylinder, and the remaining steam after condensation is discharged from the condensing cylinder.

[0024] The present application has the following beneficial effects:

[0025] 1. In the present application, the evaporation cylinder is divided into a storage cavity and a heating cavity by a partition plate, the wastewater is first added into the storage cavity, the wastewater is sprayed on the plurality of heating cylinders through the water distribution member, the wastewater flows downward on the inner and outer walls of the heating cylinders in the form of a thin water film, and is heated and evaporated on both sides, thereby greatly increasing the heat transfer area and improving the heating efficiency; at the same time, the wastewater flows in the form of a thin water film, forms a water flow circulation, can wash the surface of the heating cylinder, the water film continuously updates the boundary layer, and inhibits fouling.

[0026] 2、In the present application, by connecting the steam compressor on the conveying pipe, and the conveying pipe has a spiral section and the spiral section penetrates the storage cavity, by setting the steam compressor, it is used to extract the steam in the heating cavity, so that the heating cavity will appear micro negative pressure or negative pressure state, through the negative pressure, reduce the boiling point of wastewater, so that the wastewater is more easily heated and evaporated, improve the evaporation efficiency, at the same time, when the high temperature and high pressure steam flows along the spiral section, it will conduct heat to the wastewater in the storage cavity, so as to realize the secondary preheating of the wastewater, improve the wastewater heating and evaporation efficiency.

[0027] 3、In the present application, by connecting the second sleeve at the bottom end of the evaporation cylinder, and slidingly arranging the filter screen plate in the second sleeve, when the wastewater circulates, the filter screen plate intercepts the salt crystals, only the concentrated liquid passes through, the salt crystals are intercepted, and it is ensured that the salt crystals do not affect the first water pump or the water distribution device in the water circulation process. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is the perspective view of the present application;

[0029] Figure 2 is the perspective view of the present application;

[0030] Figure 3 is another perspective view of the present application;

[0031] Figure 4 is another perspective view of the present application;

[0032] Figure 5 is the perspective view of the heating device of the present application;

[0033] Figure 6 is the perspective view of the heating device of the present application;

[0034] Figure 7 is the perspective view of the water distribution device of the present application;

[0035] Figure 8 is the perspective view of the water distribution device of the present application; Figure 2 is the enlarged view of A in the present application;

[0036] Figure 9 is the enlarged view of B in the present application; Figure 2

[0037] Figure 10 is the enlarged view of C in the present application. Figure 3

[0038] ​​Reference numerals: 1. Evaporator; 2. Baffle plate; 3. Heating element; 4. Water distribution element; 5. Return pipe; 6. First water pump; 7. Condenser; 8. Delivery pipe; 9. Condenser; 10. First sleeve; 11. Shaft; 12. Blade; 13. Second sleeve; 14. Gate valve; 15. Filter screen; 16. Spring; 17. Rotating shaft; 18. Cam; 19. Pulley assembly; 20. Mounting bracket; 21. Defoaming screen; 22. 1. Steam compressor; 23. Ring pipe; 24. Nozzle; 25. Spiral plate; 301. Heating rod; 302. Heating cylinder; 303. Electric heating rod; 304. Electric heating wire; 401. Main pipe; 402. Secondary pipe; 403. U-shaped pipe; 404. Nozzle; 405. Rotating rod; 406. Bevel gear assembly; 407. Motor; 901. Cooling box; 902. Water pipe; 903. Spiral pipe; 904. Second water pump. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0040] like Figures 1-9 As shown, an embodiment of the present invention provides a water treatment device for high-salt, high-COD wastewater, comprising:

[0041] The evaporation cylinder 1 is provided with a partition plate 2, which is used to separate the evaporation cylinder 1 into storage cavities and heating cavities distributed upward and downward. Preferably, the top of the evaporation cylinder 1 is provided with a liquid adding pipe communicating with the storage cavities. The heating cavities are provided with heating pieces 3. The heating piece 3 comprises a heating rod 301 provided in the heating cavity. A plurality of heating cylinders 302 in concentric distribution are fixed on the heating rod 301. An electric heating rod 303 is arranged in the heating rod 301. An electric heating wire 304 connected with the electric heating rod 303 is arranged in the heating cylinder 302. Preferably, the electric heating wire 304 is in a spiral structure, so that the electric heating wire 304 can uniformly and comprehensively heat the heating cylinder 302 after being electrified. An airflow channel is formed between adjacent two heating cylinders 302. The partition plate 2 is communicated with a water distribution piece 4, which is used to spray waste water to the inner and outer walls of the plurality of heating cylinders 302. The storage cavities and the heating cavities are communicated with a reflux pipe 5. The reflux pipe 5 is communicated with a first water pump 6 arranged on the evaporation cylinder 1. When the salt-containing waste water is treated, the waste water is added from the liquid adding pipe into the storage cavities. The water distribution piece 4 sprays the waste water in the storage cavities to the inner and outer walls of the plurality of heating cylinders 302. The waste water flows downward along the wall of the heating cylinder 302 under the action of gravity, thereby forming a thin water film. The electric heating rod 303 and the electric heating wire 304 are electrified to heat the heating rod 301 and the heating cylinder 302, thereby conducting heat from two sides, so as to conduct heat to the thin water film. After the waste water is heated, light components (water vapor) are discharged from the top, and heavy components (concentrated liquid) are settled in the lower cavity. The water in the waste water evaporates to generate steam, which flows upward in the airflow channel. The salt in the waste water is concentrated. Part of the concentrated liquid flows downward. Part of the salt is heated to form salt crystals attached to the wall of the heating cylinder 302. Since the water distribution piece 4 continuously distributes water, the liquid film not only continuously covers the heating cylinder 302 for heating under the flow of the water stream, but also washes the inner and outer walls of the heating cylinder 302. The turbulent liquid film continuously updates the boundary layer, avoids local overheating, inhibits fouling, and needs to be explained. The waste water spraying amount of the water distribution piece 4 is greater than the evaporation amount of the waste water, so as to ensure that the inner and outer walls of the heating cylinder 302 can stably form a thin water film, and local dry burning of the heating cylinder 302 is avoided. Since the spraying amount of the water distribution piece 4 is greater than the evaporation amount, the waste water in the heating cavity will gradually increase. Through the reflux pipe 5, the first water pump 6 works to send the waste water in the heating cavity back to the storage cavities through the reflux pipe 5, thereby forming a water circulation. The water circulation realizes progressive concentration of the waste water. At the same time, since the waste water is heated by the heating cylinder 302 and has a certain heat, when it is sent back to the storage cavities, it is mixed with the waste water in the storage cavities, which can preliminarily preheat the original waste water in the waste water cavity, which is more beneficial to subsequent heating and evaporation. Preferably, the first water pump 6 is a corrosion-resistant magnetic pump, which can avoid corrosion by the waste water and improve the service life. When the waste water circulates, the waste water is progressively concentrated, the water in the waste water is evaporated by steam, and the concentrated liquid and part of the crystals are retained in the heating cavity. Subsequently, the concentrated liquid and part of the crystals are discharged and treated.

[0042] A condensing cylinder 7 is arranged at one side of the evaporation cylinder 1, the condensing cylinder 7 is communicated with the heating cavity through a conveying pipe 8, the condensing cylinder 7 is provided with a condensing component 9, preferably, as shown in the figure, the conveying pipe 8 is communicated with the heating cavity at the end far away from the condensing cylinder 7, the steam generated by the water heating is conveyed into the condensing cylinder 7 through the conveying pipe 8, the steam is condensed through the condensing component 9, thereby condensing water, the condensed water can be recycled, preferably, the condensing cylinder 7 is communicated with two discharge pipes, one of which is used for discharging the condensed water generated by condensation, and the other is used for discharging the residual gas after condensation; Figure 3

[0043] In the scheme, the evaporation cylinder 1 is divided into a storage cavity and a heating cavity by the partition plate 2, the wastewater is first added into the storage cavity, and the wastewater is sprayed on the plurality of heating cylinders 302 through the water distribution component 4, the wastewater flows down in the form of thin water film on the inner and outer walls of the heating cylinder 302, and is subjected to double-sided heating and evaporation, thereby greatly improving the heat transfer area and the heating efficiency, at the same time, the wastewater flows in the form of thin water film, forms water flow circulation, can wash the surface of the heating cylinder 302, the turbulent liquid film continuously updates the boundary layer, avoids local overheating, and inhibits scaling.

[0044] As shown in the figures, Figure 7 , Figure 8 and Figure 9 , the specific structure of the water distribution component 4 of the application is disclosed, the water distribution component 4 comprises a main pipe 401 rotatably communicated at the bottom of the partition plate 2, the end of the main pipe 401 is communicated with a plurality of auxiliary pipes 402, the auxiliary pipes 402 are communicated with a plurality of U-shaped pipes 403, the plurality of U-shaped pipes 403 are respectively corresponding to the plurality of heating cylinders 302, the opposite sides of the inner bends of the U-shaped pipes 403 are communicated with a plurality of nozzles 404, a rotating rod 405 is rotatably arranged on the evaporation cylinder 1, one end of the rotating rod 405 is drivingly connected with the main pipe 401 through a bevel gear assembly 406, the other end is connected with a motor 407 arranged on the evaporation cylinder 1, the wastewater in the storage cavity flows into the main pipe 401, and then is branched into the plurality of auxiliary pipes 402, and then is separated into the plurality of U-shaped pipes 403, and finally is sprayed out from the plurality of nozzles 404, preferably, as shown in the figure, Figure 9 the heating cylinder 302 is located in the U-shaped pipe 403, and the wastewater sprayed out from the nozzle 404 is sprayed on the inner and outer walls of the heating cylinder 302, when the wastewater is sprayed, the motor 407 works, the output shaft of the motor 407 drives the rotating rod 405 to rotate, the linkage of the bevel gear assembly 406 drives the main pipe 401 to rotate, thereby making the wastewater uniformly sprayed on the inner and outer walls of the heating cylinder 302, making the wastewater flow down, thereby forming a thin water film and the thin water film covering the inner and outer wall surfaces of the heating cylinder 302, it should be noted that when the wastewater is heated and evaporated, the light component (water) generates steam flowing upward, which will not affect the normal engagement of the bevel gear assembly 406.

[0045] As shown in the figures, Figure 8 ​As shown, the further technical scheme of the application for water distribution device 4 is disclosed, the first sleeve 10 is communicated on the partition plate 2, the main pipe 401 is in rotation communication with the first sleeve 10, the top end of the main pipe 401 is fixedly provided with a shaft 11 through a support rod, a plurality of annularly distributed blades 12 are arranged on the shaft 11, preferably, the blade 12 has a certain spiral amplitude, the shaft 11 is fixedly arranged on the main pipe 401 through a support rod, the shaft 11 is coaxial with the main pipe 401 and has a liquid passage, which does not affect the normal flow of wastewater, when the main pipe 401 rotates, the shaft 11 is driven to rotate, and the plurality of blades 12 are driven to rotate, the first sleeve 10, the shaft 11 and the blade 12 form an impeller mechanism, when the main pipe 401 rotates, the impeller mechanism stirs the water and applies a pushing force to the wastewater, increases the flow pressure and flow rate of the wastewater along the main pipe 401, so that the wastewater can uniformly cover the surface of the heating cylinder 302, thereby improving the water distribution effect.

[0046] As shown in Figure 10 , the further technical scheme of the application for water circulation is disclosed, the second sleeve 13 is communicated at the bottom end of the evaporation cylinder 1, the end of the second sleeve 13 is provided with a gate valve 14, the return pipe 5 is communicated with the second sleeve 13, the filter screen plate 15 is slidably arranged in the second sleeve 13, the spring 16 is connected between the filter screen plate 15 and the gate valve 14, during normal heating and evaporation, the gate valve 14 is closed, because the wastewater is circulated and gradually concentrated, part of the salt will crystallize when the wastewater is heated, by communicating the second sleeve 13 at the bottom end of the evaporation cylinder 1 and slidably arranging the filter screen plate 15 therein, when the wastewater circulates, the filter screen plate 15 intercepts the salt crystals, only the concentrated liquid passes through, the salt crystals are intercepted, avoiding the salt crystals entering the first water pump 6 or the reverse flow storage cavity, because the filter screen plate 15 is slidably arranged and provided with the spring 16, the water flow will impact the filter screen plate 15 when flowing downward, thereby compressing the spring 16, so that the filter screen plate 15 will generate a vibration force when intercepting the salt crystals, using the vibration force, preventing the salt crystals from blocking the mesh holes of the filter screen plate 15, ensuring that the wastewater can normally circulate, after the wastewater is gradually concentrated by circulation, the gate valve 14 can be opened in the last stage, so as to discharge the concentrated liquid and the salt crystals, the gate valve 14 is one of the most commonly used cut-off valves, mainly used to connect or cut off the medium in the pipeline, the gate plate therein can block the second sleeve 13 or completely unblock, therefore, when the gate valve 14 is opened, the filter screen plate 15 can be removed and separated.

[0047] As shown in Figure 3 and Figure 10As shown, the present invention discloses a further technical solution for the filter screen plate 15. A rotating shaft 17 is rotatably passed through the evaporator cylinder 1. A cam 18 is fixed on the rotating shaft 17. The convex end of the cam 18 intermittently abuts against the filter screen plate 15. The rotating shaft 17 and the rotating rod 405 are connected by a belt pulley assembly 19. When the rotating rod 405 rotates, the rotating shaft 17 is driven to rotate synchronously under the linkage of the belt pulley assembly 19. When the rotating shaft 17 rotates, it drives the cam 18 to rotate. When the cam 18 rotates, its convex end abuts against the filter screen plate 15. Under the elastic force of the spring 16, the filter screen plate 15 is ensured to vibrate normally and to avoid clogging.

[0048] like Figure 2 and Figure 8 As shown, a further technical solution for steam according to the present invention is disclosed. A mounting bracket 20 is fixedly mounted on the main pipe 401, and a defoaming screen 21 is fixedly mounted on the mounting bracket 20. Preferably, as shown... Figure 3 As shown, the mounting bracket 20 and the defoaming net 21 are positioned below the conveying pipe 8. When the wastewater is heated and evaporates to produce steam, the steam will flow upwards, carrying some mist or liquid droplets. By setting the mounting bracket 20 and the defoaming net 21 on the main pipe 401, the defoaming net 21 is a kind of wire mesh woven in a special way, mainly used to remove mist and liquid droplets in the gas, so as to ensure that the steam does not carry salt crystals, thereby improving its practicality.

[0049] like Figure 1 , Figure 2 and Figure 3 As shown, a further technical solution for steam in this invention is disclosed. A steam compressor 22 is connected to the conveying pipe 8. The conveying pipe 8 has a spiral section that extends through the storage cavity. One end of the return pipe 5 located in the storage cavity is connected to a ring pipe 23. Several nozzles 24 are connected to the ring pipe 23. Since the defoaming net 21 can eliminate mist and liquid droplets in the gas, it also creates slight resistance to the flow of steam. By setting the steam compressor 22, which is used to extract steam from the heating cavity, it is easier for steam to flow into the conveying pipe 8. Preferably, in actual use, the pumping capacity of the steam compressor 22 is slightly greater than that of the wastewater. The evaporation rate results in a slight negative pressure or negative pressure state in the heating chamber. This negative pressure lowers the boiling point of the wastewater, making it easier to heat and evaporate, thus improving evaporation efficiency. Simultaneously, the low-pressure steam generated in the heating chamber is compressed and heated by the steam compressor 22. The heated steam first flows along the spiral section and then into the condenser 7. Since the spiral section is located within the storage chamber, when the high-temperature, high-pressure steam flows along the spiral section, it transfers heat to the wastewater in the storage chamber, thus achieving secondary preheating of the wastewater. The cooled steam after heat exchange is then transported to the condenser 7 and condensed by the condenser element 9. Preferably, as shown... Figure 2As shown, the ring pipe 23 is located directly above the spiral section, when the wastewater is circulated and gradually concentrated, the liquid level in the storage chamber will gradually decrease, so that the spiral section is partially exposed outside the liquid level, when the wastewater is returned to the storage chamber through the return pipe 5, it will first flow into the ring pipe 23, and then flow downward through the plurality of nozzles 24, the returned wastewater will flush the spiral section, which can better utilize the heat of the spiral section for preheating.

[0050] As shown in Figure 2 and Figure 4 The specific structure of the condensing part 9 of the present application is disclosed, the condensing part 9 comprises a cooling box 901 arranged on the outer wall of the condensing cylinder 7, two water pipes 902 are communicated with the cooling box 901, the ends of the two water pipes 902 are communicated with a spiral pipe 903 located in the condensing cylinder 7, one of the two water pipes 902 is communicated with a second water pump 904 arranged on the cooling box 901, preferably, the cooling box 901 is used for containing water or cooling liquid, and a refrigeration device for refrigerating the water or cooling liquid is arranged on the cooling box 901, after the water is refrigerated, the second water pump 904 works to deliver the refrigerated water in the cooling box 901 into the spiral pipe 903 through one of the two water pipes 902, and then returns to the cooling box 901 through the other water pipe 902, preferably, the communication port of the delivery pipe 8 with the condensing cylinder 7 is located below the spiral pipe 903, when the steam is delivered into the condensing cylinder 7, the steam will flow upward, and the steam will contact the spiral pipe 903 when flowing, so that the steam is condensed, and the condensed water is stored in the condensing cylinder 7, and the remaining steam after condensation is discharged from the condensing cylinder 7.

[0051] As shown in Figure 2 and Figure 4 Further technical solutions of the present application for steam condensation are disclosed, the condensing cylinder 7 is fixedly provided with a spiral plate 25, which is used for forming a spiral channel, and the spiral pipe 903 is located in the spiral channel, by arranging the spiral plate 25, the spiral channel formed by the spiral plate 25 guides the steam to flow upward in a spiral manner, which increases the residence time of the steam in the condensing cylinder 7, and at the same time, the spiral guidance of the steam enables the steam to better contact the spiral pipe 903, thereby further improving the condensation effect.

[0052] A water treatment method for high-salt and high-COD wastewater has the following steps:

[0053] S1: adding salt-containing wastewater into the storage chamber, spraying the wastewater uniformly on the inner and outer walls of the plurality of heating cylinders 302 through the water distribution device 4, and flowing the wastewater in the form of water film along the inner and outer walls of the heating cylinders 302 downward and gathering at the bottom of the storage chamber; the first water pump 6 works to return the wastewater in the storage chamber to the storage chamber through the return pipe 5, thereby forming a water flow circulation;

[0054] S2: the electric heating rod 303 and the electric heating wire 304 are powered to heat the heating rod 301 and the heating cylinder 302 respectively, the heat is conducted to the flowing water film, the waste water is heated to generate steam, the steam flows upward along the airflow ring channel formed by the adjacent heating cylinder 302, and the concentrated liquid and the salt crystals are stored in the bottom of the heating cavity after the waste water is circulated and heated and evaporated;

[0055] S3: the steam generated by heating is transported to the steam compressor 22 through the conveying pipe 8, the steam compressor 22 compresses and heats the steam, the heated steam first flows through the spiral section flow path storage cavity, preheats the waste water in the storage cavity, and then flows to the condensing cylinder 7, and then is condensed through the condensing element 9;

[0056] S4: when the heat-exchanged steam flows into the condensing cylinder 7, the second water pump 904 works, which transports the refrigerated cooling liquid in the cooling box 901 to the spiral pipe 903 through one of the water pipes 902, and then flows back to the cooling box 901 through the other water pipe 902, the steam is condensed when it contacts the spiral pipe 903, the condensed water is stored in the condensing cylinder 7, and the remaining gas is discharged from the condensing cylinder 7.

[0057] The above description of the disclosed embodiments enables those skilled in the art to carry out or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A water treatment device for high-salt, high-COD wastewater, characterized in that, include: An evaporator (1) is provided with a partition (2) inside, which is used to divide the evaporator (1) into a storage chamber and a heating chamber distributed vertically. A heating element (3) is provided in the heating chamber. The heating element (3) includes a heating rod (301) provided in the heating chamber. Several heating cylinders (302) are fixed on the heating rod (301) and arranged concentrically. An electric heating rod (303) is provided in the heating rod (301). An electric heating wire (304) connected to the electric heating rod (303) is provided in the heating cylinder (302). The partition (2) is connected to a water distribution component (4), which is used to spray wastewater onto the inner and outer walls of several heating cylinders (302). The water distribution component (4) includes a main pipe (401) rotatably connected to the bottom of the partition (2). The end of the main pipe (401) is connected to several secondary pipes (402). Several U-shaped pipes (403) are connected to the secondary pipes (402). The several U-shaped pipes (403) correspond one-to-one with several heating cylinders (302). The inner bends of the U-shaped pipes (403) are connected to spray nozzles on opposite sides. The nozzle (404) is rotatably mounted on the evaporator (1). One end of the rotating rod (405) is connected to the main pipe (401) via a bevel gear assembly (406), and the other end is connected to a motor (407) mounted on the evaporator (1). The storage chamber and the heating chamber are connected by a return pipe (5). A first water pump (6) mounted on the evaporator (1) is connected to the return pipe (5). A first sleeve (10) is connected to the partition plate (2). The main pipe (401) and the first sleeve (10) rotate. The main pipe (401) is connected to the top of the main pipe (401) by a support rod and a shaft (11) is fixed thereon. The shaft (11) is provided with a number of blades (12) arranged in a ring. The bottom end of the evaporator (1) is connected to the second sleeve (13). The end of the second sleeve (13) is provided with a gate valve (14). The return pipe (5) is connected to the second sleeve (13). A filter screen (15) is slidably arranged inside the second sleeve (13). A spring (16) is connected between the filter screen (15) and the gate valve (14). A condenser (7) is set on one side of the evaporator (1). The condenser (7) is connected to the heating chamber by a conveying pipe (8). A condenser (9) is installed inside the condenser (7).

2. The water treatment device for high-salt, high-COD wastewater according to claim 1, characterized in that, The evaporator (1) has a rotating shaft (17) that rotates through it. A cam (18) is fixed on the rotating shaft (17). The convex end of the cam (18) intermittently abuts against the filter screen (15). The rotating shaft (17) and the rotating rod (405) are connected by a belt pulley assembly (19).

3. The water treatment device for high-salt, high-COD wastewater according to claim 1, characterized in that, The main pipe (401) is fixedly provided with a mounting bracket (20), and the mounting bracket (20) is fixedly provided with a defoaming screen (21).

4. The water treatment device for high-salt, high-COD wastewater according to claim 1, characterized in that, The conveying pipe (8) is connected to a steam compressor (22). The conveying pipe (8) has a spiral section that extends through the storage cavity. The return pipe (5) is connected to a ring pipe (23) at one end within the storage cavity. Several nozzles (24) are connected to the ring pipe (23).

5. The water treatment device for high-salt, high-COD wastewater according to claim 1, characterized in that, The condenser (9) includes a cooling box (901) disposed on the outer wall of the condenser cylinder (7), and two water pipes (902) are connected to the cooling box (901). The ends of the two water pipes (902) are connected to a spiral tube (903) located inside the condenser cylinder (7). A second water pump (904) disposed on the cooling box (901) is connected to one of the water pipes (902).

6. The water treatment device for high-salt, high-COD wastewater according to claim 5, characterized in that, The condenser cylinder (7) is equipped with a spiral plate (25) to form a spiral channel, and the spiral tube (903) is located inside the spiral channel.

7. A method for treating high-salinity, high-COD wastewater, using the high-salinity, high-COD wastewater treatment apparatus as described in any one of claims 1-6, characterized in that, It includes the following steps: S1: Add saline wastewater into the storage chamber, and spray the wastewater evenly on the inner and outer walls of several heating cylinders (302) through the water distribution device (4). The wastewater flows down along the inner and outer walls of the heating cylinders (302) in the form of a water film and gathers at the bottom of the storage chamber. The first water pump (6) does work, and it returns the wastewater in the storage chamber to the storage chamber through the return pipe (5) to form a water circulation. S2: After the electric heating rod (303) and the electric heating wire (304) are powered on, they heat the heating rod (301) and the heating cylinder (302) respectively. The heat is conducted to the flowing water film. After the wastewater is heated, steam is generated. The steam flows upward along the airflow loop formed by the adjacent heating cylinders (302). After the wastewater is circulated and heated and evaporated, the concentrated liquid and salt crystals remain at the bottom of the heating chamber. S3: The steam generated by heating is transported to the steam compressor (22) through the conveying pipe (8). The steam compressor (22) compresses and heats the steam. The heated steam first passes through the spiral section to the storage chamber to preheat the wastewater in the storage chamber. The steam after heat exchange then flows into the condenser (7) and is condensed by the condenser (9). S4: When the heat-exchanged steam flows into the condenser (7), the second water pump (904) does work, which transports the cooled liquid in the cooling box (901) to the spiral tube (903) through one of the water pipes (902), and then back to the cooling box (901) through the other water pipe (902). When the steam comes into contact with the spiral tube (903), it condenses. The condensate is stored in the condenser (7), and the residual gas after condensation is discharged from the condenser (7).

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