Steel plant high-concentration saline wastewater recovery and treatment system

Abstract

This invention relates to the field of water pollution treatment technology, and more particularly to a system for recovering and treating high-concentration saline wastewater from steel plants. It includes a segmented tank body, with an inlet pipe, an outlet pipe, and a first vent pipe fixedly connected to the tank body. Symmetrically distributed baffles are fixedly connected to the middle of the tank body, and these baffles are collectively fixed to an outer ring heating pipe and an inner ring heating pipe. A fixed cylinder is fixedly connected to the upper baffle, and the fixed cylinder has a ring-shaped array of outlets. A distributor is fixedly connected inside the fixed cylinder, and a sealing shell is slidably connected to the fixed cylinder. This invention utilizes the liquid level to dynamically adjust the feeding frequency of the outer ring heating pipe. When the liquid level has not risen to a preset threshold, the feeding of the outer ring is temporarily blocked, providing a thermal equilibrium buffer period for the outer ring heating pipe, allowing its temperature to gradually rise to near that of the inner ring. This intermittent feeding method ensures the efficiency of wastewater treatment.

Description

Technical Field

[0001] This invention relates to the field of water pollution treatment technology, and in particular to a system for the recovery and treatment of high-concentration saline wastewater from steel plants. Background Technology

[0002] As a water-intensive and highly polluting industry, steel production generates a large amount of saline wastewater during processes such as steelmaking, rolling, and cooling. This wastewater includes cooling water, flushing water, and desulfurization wastewater. These wastewaters contain high concentrations of chlorides, sulfates, nitrates, and heavy metals (such as chromium, zinc, and lead). Direct discharge of such wastewater will lead to soil salinization, water pollution, and environmental violations. Therefore, green production can only be achieved through resource recycling and harmless treatment.

[0003] The current mainstream process consists of four stages: pretreatment (neutralization and precipitation to remove heavy metals), evaporation and concentration (extracting salts from wastewater using falling film evaporators), crystallization and salt separation (separating sulfates and other substances to achieve resource recovery), and condensate reuse (purified water is recycled back to the production system), ultimately reducing pollution, lowering fresh water consumption, and meeting environmental protection requirements.

[0004] Among them, the core equipment in the evaporation and concentration stage - the falling film evaporator - achieves wastewater concentration in the following way: the wastewater is evenly distributed to the top of the vertical heating tube by the distributor and flows downward along the inner wall of the tube to form a thin liquid film; at the same time, high-temperature steam is introduced into the outer wall of the heating tube, and the heat is transferred to the thin liquid film through the heating tube, so that the water evaporates quickly, and the water vapor and concentrated liquid produced by evaporation are separated at the bottom.

[0005] However, the existing tubular heat exchange structure of falling film evaporators has the following drawbacks:

[0006] Because the outer heating tubes are close to the outer wall of the device, which is directly exposed to the external environment, a temperature difference occurs between the outer heating tubes near the inner wall and the inner heating tubes near the center of the device. This temperature gradient imbalance reduces the heat transfer efficiency of the outer heating tubes, making it impossible for them to maintain a stable temperature. Consequently, the liquid evaporation rate is lower than that of the inner heating tubes, ultimately preventing the wastewater inside the outer heating tubes from being properly treated. Summary of the Invention

[0007] To address the problems mentioned in the background section, this invention provides a system for the recovery and treatment of high-concentration saline wastewater from steel plants.

[0008] The technical solution of this invention is: a high-concentration saline wastewater recovery and treatment system for steel plants, comprising a segmented tank body, wherein an inlet pipe and an outlet pipe are fixedly connected and connected to the upper and lower sides of the segmented tank body respectively, a first vent pipe is fixedly connected and connected to the lower side of the segmented tank body, an inlet pipe and a second vent pipe are fixedly connected to the middle part of the segmented tank body, symmetrically distributed baffles are fixedly connected to the middle part of the segmented tank body, and a heating chamber is provided in the segmented tank body located between the symmetrically distributed baffles, the heating chamber and the... The air inlet pipe and the second air outlet pipe are both connected. The symmetrically distributed baffles are jointly fixed with a number of outer ring heating pipes in a ring array, all of which are connected to the segmented tank body. The symmetrically distributed baffles are jointly fixed with a number of inner ring heating pipes connected to the segmented tank body. The baffle located on the upper side is fixed with a fixed cylinder. The fixed cylinder is provided with a discharge port distributed in a ring array. A distributor is fixed inside the fixed cylinder. The fixed cylinder is slidably connected with a sealing shell for blocking all the discharge ports.

[0009] To further explain, the outer ring heating tube is composed of a corrugated part and a vertical part, with the corrugated part located on the upper side of the vertical part, and all the outer ring heating tubes are located outside all the inner ring heating tubes.

[0010] To further explain, on the projection onto the horizontal plane, the fixed cylinder is located between all the outer ring heating tubes and all the inner ring heating tubes, and the fixed cylinder is fixedly connected to a spring telescopic rod, the telescopic end of which is fixedly connected to the sealing shell.

[0011] To further explain, the fixed cylinder is fixedly connected to a first guide shell located below all the discharge ports. The first guide shell is used to guide the wastewater flowing out of all the discharge ports. The diameter of the circle formed by all the outer ring heating tubes is smaller than the diameter of the first guide shell, and the lower side of the first guide shell does not contact the adjacent sealing plate.

[0012] To further explain, the fixed cylinder is provided with a floating component located outside the distributor, which is used to drive the sealing shell to move upward.

[0013] To further explain, a corrugated pipe is fixedly connected inside the corrugated section of the outer ring heating pipe, and there is a gap between the corrugated pipe and the adjacent outer ring heating pipe. This gap is used to guide wastewater, and the upper side of the corrugated pipe is tapered.

[0014] To further explain, the corrugated pipe is provided with straight air inlets arranged in a ring array. The gap between the corrugated pipe and the adjacent outer ring heating pipe is connected to the inside of the corrugated pipe through all the air inlets, so that the gas evaporated in the wastewater can be discharged in a timely manner.

[0015] To further explain, the bellows is provided with a linear array of filters, which are used to block the adjacent air inlets that are arranged in a ring array.

[0016] To further explain, the bellows is provided with a second guide shell arranged in a linear array, and a third guide ring is fixedly connected and connected to the lower side of the bellows. Both the second guide shell and the third guide ring are used for drainage.

[0017] To further explain, the air inlets distributed in a ring array are located below the crests of the adjacent bellows, the filter element is located below the crests of the adjacent bellows, the second guide shell is located below the crests of the adjacent bellows, and the second guide shell is located above the adjacent filter element.

[0018] The beneficial effects of this invention are as follows: To solve the problem of unbalanced evaporation efficiency caused by temperature gradients, which in turn leads to the inability to properly treat wastewater located in the outer heating tube, this invention proposes a zoned dynamic feeding control method:

[0019] The inner heating tube provides a continuous and stable feed, ensuring an uninterrupted evaporation process.

[0020] Adjustment of the feeding frequency of the outer ring heating tube: The feeding frequency of the outer ring heating tube is dynamically adjusted by the liquid level. When the liquid level has not risen to the preset threshold, the feeding of the outer ring is temporarily blocked to provide a thermal balance buffer period for the outer ring heating tube, so that its temperature gradually rises to be close to that of the inner ring. In this way, the efficiency of wastewater treatment is ensured by intermittent feeding.

[0021] In the process of treating wastewater, a corrugated section is set on the outer ring heating pipe to increase the contact area between the outer ring heating pipe and the hot air, while extending the flow path of the wastewater, thereby compensating for the temperature difference between the inside and outside. By adding a second guide shell between the corrugated pipe and the outer ring heating pipe, space is provided for the discharge of moisture. With the distribution of filter elements and air inlets, the treated moisture is separated from the wastewater and the discharge of moisture is accelerated. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0023] Figure 2 This is a three-dimensional structural cross-sectional view of the present invention;

[0024] Figure 3 This is a three-dimensional sectional view of the segmented tank body of the present invention;

[0025] Figure 4 This is a three-dimensional structural cross-sectional view of the sealing shell of the present invention;

[0026] Figure 5This is a three-dimensional structural diagram showing the positional relationship between the distributor and the fixed cylinder of the present invention;

[0027] Figure 6 This is an exploded three-dimensional view of the sealing shell and spring telescopic rod of the present invention;

[0028] Figure 7 This is a top view of the three-dimensional structure of the segmented tank body and outer heating tube of the present invention;

[0029] Figure 8 This is a three-dimensional structural cross-sectional view of the outer ring heating tube of the present invention;

[0030] Figure 9 This is a three-dimensional structural diagram showing the positional relationship between the filter element and the second guide shell of the present invention.

[0031] Figure 10 This is a three-dimensional structural cross-sectional view of the bellows of the present invention;

[0032] Figure 11 This is a three-dimensional structural diagram showing the positional relationship of the third guide ring of the present invention.

[0033] In the attached diagrams: 1: Segmented tank body, 2: Feed pipe, 3: Air inlet pipe, 301: First air outlet pipe, 302: Discharge pipe, 4: Second air outlet pipe, 5: Seal plate, 6: Heating chamber, 7: Outer ring heating pipe, 8: Inner ring heating pipe, 9: Fixed cylinder, 10: Discharge port, 11: Distributor, 12: Sealing shell, 13: Spring telescopic rod, 14: First guide shell, 15: Floating component, 16: Corrugated pipe, 17: Air vent, 18: Filter component, 19: Second guide shell, 20: Third guide ring. Detailed Implementation

[0034] The invention will now be described more fully below with reference to the accompanying drawings, in which presently preferred embodiments of the invention are illustrated. However, the invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided for thoroughness and completeness and to fully convey the scope of the invention to those skilled in the art.

[0035] To address the issue of evaporation efficiency imbalance caused by temperature gradients, which prevents the wastewater in the outer heating tube from being properly treated, this invention proposes a zoned dynamic feeding method. This method allows continuous feeding into the inner heating tube 8 to ensure uninterrupted evaporation. The feeding frequency of the outer heating tube 7 is then dynamically adjusted based on the liquid level. When the liquid level fails to reach a preset threshold, feeding into the outer heating tube 7 stops, providing a thermal equilibrium buffer period for it to gradually rise to a temperature close to that of the inner tube. This intermittent feeding method provides sufficient heating time for the outer heating tube 7, thus ensuring efficient wastewater treatment. Details are as follows: Example 1

[0036] Steel plant high-concentration saline wastewater recovery and treatment system, such as Figures 1-7 As shown, the system includes a segmented tank 1. An inlet pipe 2 and an outlet pipe 302 are fixedly connected and connected to the upper and lower sides of the segmented tank 1, respectively. A first vent pipe 301 is fixedly connected and connected to the lower side of the segmented tank 1. An inlet pipe 3 and a second vent pipe 4 are fixedly connected to the middle of the segmented tank 1. Symmetrically distributed baffles 5 are fixedly connected to the middle of the segmented tank 1. A heating chamber 6 is provided inside the segmented tank 1, located between the symmetrically distributed baffles 5. The heating chamber 6 is connected to both the inlet pipe 3 and the second vent pipe 4. The inlet pipe 3 and the second vent pipe 4 are used to supply hot air into the heating chamber 6 and to discharge hot air, respectively. The sealing plates 5 are fixed together with a number of outer ring heating pipes 7 arranged in a ring and connected to the inside of the segmented tank 1. The symmetrically distributed sealing plates 5 are fixed together with a number of inner ring heating pipes 8 connected to the inside of the segmented tank 1. All the outer ring heating pipes 7 are located outside all the inner ring heating pipes 8. The sealing plate 5 located on the upper side is fixedly connected to a fixed cylinder 9. The fixed cylinder 9 is provided with a discharge port 10 arranged in a ring. A distributor 11 is fixedly connected inside the fixed cylinder 9. The fixed cylinder 9 is slidably connected to a sealing shell 12 for blocking all discharge ports 10. The distributor 11 is used to guide the wastewater guided by the feed pipe 2.

[0037] The segmented tank 1 is equipped with a control terminal (not shown in the figure). All electrical components mentioned in this invention are electrically connected to the control terminal. By injecting hot air into the heating chamber 6, the hot air in the heating chamber 6 heats all the outer ring heating pipes 7 and inner ring heating pipes 8, thereby indirectly heating the wastewater flowing through the outer ring heating pipes 7 and inner ring heating pipes 8, thereby achieving the evaporation of water in the wastewater. The distributor 11 consists of a circular plate, four support columns, a perforated plate and several drainage pipes. The perforated plate is fixed to the fixed cylinder 9. The lower side of all the discharge ports 10 is flush with the upper side of the perforated plate. The lower side of several drainage pipes does not contact the sealing plate 5 located on the upper side.

[0038] When the distributor 11 is needed to guide the wastewater, the wastewater flows through the circular plate to the perforated plate, and is then guided by the perforated plate to several drainage pipes, and then by the drainage pipes to the sealing plate 5 located on the upper side. When the liquid level of the wastewater in the fixed cylinder 9 rises to the point that the sealing shell 12 no longer blocks all the discharge ports 10, part of the wastewater in the fixed cylinder 9 flows out through all the discharge ports 10, and the wastewater in the fixed cylinder 9 is periodically discharged in a manner that simulates flood discharge.

[0039] like Figures 2-7As shown, on the horizontal projection, the fixed cylinder 9 is located between all the outer ring heating tubes 7 and all the inner ring heating tubes 8. The fixed cylinder 9 is fixedly connected to a spring telescopic rod 13. The telescopic end of the spring telescopic rod 13 is fixedly connected to the sealing shell 12. The fixed cylinder 9 is fixedly connected to a first guide shell 14 located below all the discharge ports 10. The first guide shell 14 is used to guide the wastewater flowing out of all the discharge ports 10. The diameter of the circle formed by all the outer ring heating tubes 7 is smaller than the diameter of the first guide shell 14, and the lower side of the first guide shell 14 does not contact the adjacent sealing plate 5. The wastewater is guided to the outside of all the outer ring heating tubes 7 through the first guide shell 14, so that the wastewater does not flow directly downward along the central axis of all the outer ring heating tubes 7. A float 15 is provided inside the fixed cylinder 9 located outside the distributor 11. The float 15 is used to drive the sealing shell 12 to move upward. The float 15 can be a float. By squeezing the sealing shell 12 by the float 15, the connection state of all the discharge ports 10 is changed.

[0040] The above solution is implemented as follows: When treating wastewater by evaporation, the feed pipe 2, air inlet pipe 3, second air outlet pipe 4, first air outlet pipe 301 and discharge pipe 302 need to be connected to the feeding equipment, the hot air supply equipment, the air extraction equipment, the separator connected to the compressed blower and the discharge equipment respectively (all of the above are existing equipment and are not shown in the attached drawings). After completing the connection of the above equipment, the preparation work before the use of this device is completed.

[0041] After the preparation work is completed, the hot air supply equipment sends hot air into the heating chamber 6 through the air inlet pipe 3, and in conjunction with the air extraction equipment, extracts the gas from the heating chamber 6 through the second air outlet pipe 4, so that the gas in the heating chamber 6 circulates and heats all the outer ring heating tubes 7 and inner ring heating tubes 8 in the heating chamber 6. Then, the feeding equipment sends the wastewater into the distributor 11 through the feed pipe 2. After the wastewater comes into contact with the upper side of the distributor 11, it falls into the fixed cylinder 9 and gathers on the upper side of the lower part of the distributor 11. Then, the wastewater is distributed to all the inner ring heating tubes 8 through the distributor 11 (since the fixed cylinder 9 separates the outer ring heating tubes 7 and the inner ring heating tubes 8, the wastewater will only enter the fixed cylinder 9 at this time, so as to restrict the flow position of the wastewater). The wastewater enters from the upper side of all the inner ring heating tubes 8 and forms a thin liquid film along the inner wall and flows downward. During the process of flowing through the inner ring heating tubes 8, the wastewater in the inner ring heating tubes 8 is evaporated by its own heat to reduce the moisture content of the wastewater.

[0042] During the wastewater addition process, the amount of wastewater injected is greater than the amount guided into all the inner ring heating pipes 8 by the distributor 11. Therefore, the liquid level of the wastewater in the fixed cylinder 9 will gradually rise. During this process, the wastewater will lift the float 15 upward, causing the float 15 to move upward synchronously with the rise of the wastewater liquid level. After the float 15 rises to contact the sealing shell 12, under the action of the gradually rising wastewater liquid level, the float 15 will squeeze the sealing shell 12 upward and overcome the tension provided by the spring telescopic rod 13. During the upward movement of the float 15, the pressure on all discharge ports is released. The limiting of 10 (the extension and retraction of the spring extension rod 13 is pulled during the upward movement of the floating part 15) allows the wastewater in the fixed cylinder 9 to flow out through all the outlets 10. After flowing out through all the outlets 10, the wastewater flows along the first guide shell 14 until it falls onto the sealing plate 5 and is located on the outside of all the outer ring heating tubes 7 at the first moment. During this process, the wastewater is guided by the first guide shell 14 so that the wastewater does not directly pass through the middle of all the outer ring heating tubes 7, but flows downward along the inner side wall of all the outer ring heating tubes 7, so that the wastewater forms a thin liquid film.

[0043] As some wastewater in the fixed cylinder 9 flows out through all the outlets 10, the wastewater level in the fixed cylinder 9 decreases. The floating component 15 moves downwards along with the decrease in the wastewater level. After the floating component 15 moves downwards, it no longer squeezes the sealing shell 12. The sealing shell 12 is pulled downwards by the telescopic part of the spring telescopic rod 13, thereby restoring the blocking of all the outlets 10. After the sealing shell 12 blocks all the outlets 10, the wastewater level in the fixed cylinder 9 gradually rises, which then drives the floating component 15 to move upwards again. The subsequent working principle is the same as above. The above achieves the following: the feeding frequency of the outer ring heating tube 7 is dynamically adjusted by the liquid level. When the liquid level has not risen to the threshold (i.e., when the floating component 15 has not squeezed the sealing shell 12), the feeding of the outer ring heating tube 7 is temporarily blocked, providing a buffer period for thermal balance for the outer ring heating tube 7, so that the temperature gradually rises to be close to that of the inner side. Thus, the efficiency of wastewater treatment is ensured by intermittent feeding.

[0044] During the wastewater treatment process, the compressed blower draws gas from the segmented tank 1 through the separator and the first exhaust pipe 301, causing the gas (water vapor) in all the outer ring heating pipes 7 and inner ring heating pipes 8 to be discharged. Under the action of gravity, the treated wastewater (salt wastewater with reduced moisture content) in all the outer ring heating pipes 7 and inner ring heating pipes 8 falls to the bottom of the segmented tank 1 and is then extracted by the discharge equipment through the discharge pipe 302. Example 2

[0045] Based on Example 1, the shape of the outer heating tube 7 was modified to increase the contact area between the outer heating tube 7 and the hot air, such as... Figure 7As shown, the outer ring heating tube 7 consists of a corrugated part and a vertical part, with the corrugated part located on the upper side of the vertical part.

[0046] The above solution achieves the following: by setting a corrugated part on the outer ring heating pipe 7, the contact area between the outer ring heating pipe 7 and the hot air is increased, while the flow path of the wastewater is extended, thereby compensating for the temperature difference between the inside and outside. Example 3

[0047] Based on Example 2, a method for guiding wastewater is proposed, allowing the wastewater to slide along the inner wall of the outer ring heating pipe 7, such as... Figures 7-10 As shown, a corrugated pipe 16 is fixedly connected inside the corrugated part of the outer ring heating pipe 7. There is a gap between the corrugated pipe 16 and the adjacent outer ring heating pipe 7. This gap is used to guide wastewater. The upper side of the corrugated pipe 16 is constricted, which is used to facilitate the entry of wastewater into the gap between the corrugated pipe 16 and the adjacent outer ring heating pipe 7.

[0048] like Figures 8-11 As shown, the bellows 16 is provided with straight and annularly distributed air inlets 17. The gap between the bellows 16 and the adjacent outer ring heating tube 7 is connected to the inner side of the bellows 16 through all the air inlets 17, so that the gas evaporated in the wastewater can be discharged in time. The bellows 16 is provided with a straight array of filter elements 18, which are used to block the mechanical energy inside the adjacent and annularly distributed air inlets 17. The filter elements 18 can be gas-liquid filter screens. The bellows 16 is provided with a straight array of second guide shells 19. The lower side of the bellows 16 is fixed and connected to a third guide ring 20. Both the second guide shell 19 and the third guide ring 20 are used for flow guidance. The annularly distributed air inlets 17 are located below the crest of the adjacent bellows 16, the filter elements 18 are located below the crest of the adjacent bellows 16, the second guide shell 19 is located below the crest of the adjacent bellows 16, and the second guide shell 19 is located above the adjacent filter elements 18.

[0049] The above solution achieves the following: as the wastewater flows downward from the upper side of the inner ring heating pipe 8, the upper side of the corrugated pipe 16 acts as a constriction point, allowing the wastewater to directly enter the gap between the corrugated pipe 16 and the adjacent outer ring heating pipe 7, thereby guiding the wastewater.

[0050] As the wastewater flows along the crest of the corrugated pipe 16, it is guided by the adjacent second guide shell 19, thus leaving a gap between the second guide shell 19 and the adjacent corrugated pipe 16 to facilitate the discharge of moisture. Under the action of the compressed blower drawing gas from the segmented tank 1 through the separator and the first air outlet pipe 301, the moisture in the above-mentioned treatment process passes through the adjacent filter element 18 and enters the interior of the corrugated pipe 16 through the adjacent air inlet 17. Then it flows downward from the interior of the corrugated pipe 16, so that the treated moisture is separated from the wastewater and the discharge of moisture is accelerated.

[0051] During the process of moisture passing through the filter element 18, the filter element 18 filters the wastewater, allowing the gas to pass through while intercepting the liquid.

[0052] As the treated wastewater flows along the corrugated pipe 16, it comes into contact with the third guide ring 20. The third guide ring 20 guides the wastewater obliquely, causing it to impact and spread in all directions as it flows downward, thereby increasing the contact area between the wastewater and the inner side of the adjacent outer ring heating pipe 7.

[0053] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A steel plant high concentration salt-laden wastewater recovery treatment system, characterized by, The tank includes a segmented tank (1), with an inlet pipe (2) and an outlet pipe (302) fixedly connected and connected to the upper and lower sides of the segmented tank (1), respectively. A first vent pipe (301) is fixedly connected and connected to the lower side of the segmented tank (1). An inlet pipe (3) and a second vent pipe (4) are fixedly connected to the middle of the segmented tank (1). Symmetrically distributed baffles (5) are fixedly connected to the middle of the segmented tank (1). A heating chamber (6) is provided inside the segmented tank (1) between the symmetrically distributed baffles (5). The heating chamber (6) is connected to the inlet pipe (3) and the second vent pipe (4). All of the symmetrically distributed partition plates (5) are connected to a number of outer ring heating pipes (7) that are in a ring array and are connected to the inside of the segmented tank (1). The symmetrically distributed partition plates (5) are connected to a number of inner ring heating pipes (8) that are connected to the inside of the segmented tank (1). The upper partition plate (5) is connected to a fixed cylinder (9). The fixed cylinder (9) is provided with a discharge port (10) arranged in a ring array. A distributor (11) is fixed inside the fixed cylinder (9). The fixed cylinder (9) is slidably connected to a sealing shell (12) for blocking all the discharge ports (10). On the projection of the horizontal plane, the fixed cylinder (9) is located between all the outer ring heating tubes (7) and all the inner ring heating tubes (8), and the fixed cylinder (9) is fixedly connected to a spring telescopic rod (13), the telescopic end of the spring telescopic rod (13) being fixedly connected to the sealing shell (12). The fixed cylinder (9) is provided with a floating element (15) located outside the distributor (11), and the floating element (15) is used to drive the sealing shell (12) to move upward.

2. The steel mill high concentration salt-laden wastewater recovery treatment system according to claim 1, characterized in that, The outer ring heating tube (7) is composed of a corrugated part and a vertical part, and the corrugated part is located on the upper side of the vertical part. All the outer ring heating tubes (7) are located outside all the inner ring heating tubes (8).

3. The steel mill high concentration salt-laden wastewater recovery treatment system according to claim 1, characterized in that, The fixed cylinder (9) is fixedly connected to a first guide shell (14) located below all the discharge ports (10). The first guide shell (14) is used to guide the wastewater flowing out of all the discharge ports (10). The diameter of the circle formed by all the outer ring heating tubes (7) is smaller than the diameter of the first guide shell (14), and the lower side of the first guide shell (14) does not contact the adjacent sealing plate (5).

4. The steel mill high concentration salt-laden wastewater recovery treatment system according to claim 3, characterized in that, A corrugated pipe (16) is fixedly connected inside the corrugated part of the outer ring heating pipe (7). There is a gap between the corrugated pipe (16) and the adjacent outer ring heating pipe (7). This gap is used to guide wastewater. The upper side of the corrugated pipe (16) is closed.

5. The steel plant high-concentration saline wastewater recovery and treatment system according to claim 4, characterized in that, The corrugated pipe (16) is provided with straight air inlets (17) arranged in a ring array. The gap between the corrugated pipe (16) and the adjacent outer ring heating pipe (7) is connected to the inside of the corrugated pipe (16) through all the air inlets (17) so that the gas evaporated in the wastewater can be discharged in time.

6. The steel plant high-concentration saline wastewater recovery and treatment system according to claim 5, characterized in that, The bellows (16) is provided with filters (18) arranged in a linear array, which are used to block the adjacent air inlets (17) arranged in a ring array.

7. The steel plant high-concentration saline wastewater recovery and treatment system according to claim 6, characterized in that, The bellows (16) is provided with a second guide shell (19) arranged in a linear array. The lower side of the bellows (16) is fixed and connected to a third guide ring (20). Both the second guide shell (19) and the third guide ring (20) are used for drainage.

8. The steel plant high-concentration saline wastewater recovery and treatment system according to claim 7, characterized in that, The air inlets (17) distributed in a ring array are located below the crests of the adjacent bellows (16), the filter element (18) is located below the crests of the adjacent bellows (16), the second guide shell (19) is located below the crests of the adjacent bellows (16), and the second guide shell (19) is located above the adjacent filter element (18).

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