An apparatus for treating wastewater by adaptive internal circulation wet oxidation

Abstract

The present invention relates to the technical field of wastewater treatment. The present invention discloses a device for adaptively treating wastewater by internal circulation wet oxidation, which includes: a main reactor and a draft tube arranged vertically. The draft tube is centrally located in the main reactor. The liquid collection port is located at the top of the draft tube. The reflux enhancement baffle is installed on the inner wall of the main reactor and is located above the liquid collection port. The preheated wastewater is sent into the draft tube from the liquid collection port. After forming a high-speed jet, it impacts on the microbubble mixing component located at the bottom of the draft tube. The gas-liquid mixture after impact flows upward between the inner wall of the main reactor and the outer wall of the draft tube and is sent out from the gas-liquid outlet located at the top of the main reactor. By optimizing the internal structure of the existing reactor, the spontaneous mixing of high-temperature and low-concentration wastewater and low-temperature and high-concentration raw water is realized, the initial reaction temperature is significantly increased, the oxidation reaction rate is accelerated, and the coking problem caused by local high concentration is avoided. The residence time of the wastewater in the reactor is further prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of wastewater treatment, and more specifically, to a device for adaptively treating wastewater by internal circulation wet oxidation. Background Art

[0002] Wet oxidation technology is an efficient and environmentally friendly wastewater treatment method, suitable for treating wastewater with high COD (10 - 100 g / L). Under high temperature (200 - 325 °C) and high pressure (5 - 15 MPa) conditions, organic substances or reducible substances in the wastewater are oxidized by air to generate carbon dioxide and water. During the wet oxidation process, no secondary pollutants such as NOx, SO2, HCl, dioxins, furans, and fly ash are produced. When treating wastewater with a COD higher than 20,000 mg / L, the wet oxidation reaction can be self-sustaining and can output excess energy, further improving economic efficiency. Due to its high efficiency and economy, wet oxidation technology is widely regarded as a green and environmentally friendly wastewater treatment technology, especially suitable for treating wastewater with high salt content, high concentration, and difficult biodegradability.

[0003] Although wet oxidation technology has significant advantages, it still faces some challenges in practical engineering applications. When the organic matter concentration is too high (5w - 20w), the wet oxidation reaction is prone to polymerization and coking, generating organic polymers similar to tar, which are difficult to completely decompose and the toxicity remains. At the same time, the local viscosity increase will affect the heat transfer effect, and "hot spots" are easily formed near the reactor wall, which may lead to thermal runaway of the reactor, thus increasing the operation risk. Therefore, there is an urgent need for a device for adaptively treating wastewater by internal circulation wet oxidation, which can at least partially solve the above problems. Summary of the Invention

[0004] To achieve the above object, the present invention discloses a device for adaptively treating wastewater by internal circulation wet oxidation, including: a main reactor and a draft tube arranged vertically, the draft tube is centrally located in the main reactor, a liquid collection port is located at the top of the draft tube, a reflux enhancement baffle is installed on the inner wall of the main reactor and is located above the liquid collection port, the preheated wastewater is fed into the draft tube from the liquid collection port, forms a high-speed jet after impact, impacts on a microbubble mixing assembly located at the bottom of the draft tube, and the gas-liquid mixture after impact flows upward between the inner wall of the main reactor and the outer wall of the draft tube, and is sent out from a gas-liquid outlet located at the top of the main reactor.

[0005] Preferably, a liquid discharge port is installed at the bottom of the main reactor, a raw water inlet is installed at a position near the top of the side end of the main reactor, the preheated wastewater is fed from the raw water inlet, and after passing through the reflux enhancement baffle, is sent into the draft tube from the liquid collection port through a raw water inlet ejector to form a high-speed jet. The liquid jet speed of the raw water inlet ejector is 2.5 - 10 m / s, and a gas inlet for supplying gas to the microbubble mixing assembly is installed at a position near the bottom of the side end of the main reactor.

[0006] Preferably, the diameter of the main reactor is 0.6 - 1.2 m, the height of the main reactor is 10 - 22 m, the height of the draft tube accounts for 60% - 80% of the height of the main reactor, and the diameter of the draft tube accounts for 10% - 30% of the diameter of the main reactor.

[0007] Preferably, a plurality of drainage baffles for preventing the backflow of the gas-liquid mixture are installed on the inner wall of the main reactor from bottom to top.

[0008] Preferably, the sieve plate is sleeved on the draft tube and connected to the inner wall of the main reactor. The sieve plate is 1 - 2 m above the gas inlet, the aperture ratio of the sieve plate is 20% - 50%, and the gas-liquid mixture is evenly mixed through the sieve plate.

[0009] Preferably, the microbubble mixing assembly includes: a circulating liquid disperser, an aeration ring, and an intake air circulation baffle. The circulating liquid disperser is installed at the bottom end of the draft tube, the aeration ring is located below the circulating disperser, the gas inlet is communicated with the aeration ring, a plurality of air outlets are distributed in a circular array on the aeration ring, air columns are ejected from the air outlets, and the dispersing port of the circulating liquid disperser impacts the high-speed jet onto the air columns to form a mixture of microbubbles and wastewater. The intake air circulation baffle is distributed above the air outlets to extend the residence time of the mixture.

[0010] Preferably, the angle of the dispersing port of the circulating liquid disperser is 30 - 60°, and the angle of the liquid collecting port is 60 - 75°.

[0011] Preferably, the reflux enhancement baffle is rotatably installed on the inner wall of the main reactor through a side mounting shaft. Two inclined guide plates are installed at the end of the reflux enhancement baffle close to the liquid collecting port. An attitude adjustment assembly for adjusting the flipping angle of the reflux enhancement baffle is also installed on the main reactor. The attitude adjustment assembly is also used to adjust the inclination angle of the inclined guide plates. The attitude adjustment assembly includes: a side opening opened on the main reactor, a side sliding plate is clamped on the side opening, a spherical rotating block is rotatably installed on the side sliding plate, a rotating rod passes through the spherical rotating block and is connected to a transmission box installed at the end of the reflux enhancement baffle away from the liquid collecting port.

[0012] Preferably, inner clamping grooves are provided at the top and bottom ends of the side sliding plate, the inner clamping grooves are clamped at the top and bottom ends of the side opening, the side sliding plate seals the side opening, an electric telescopic rod is installed at the side end of the main reactor, the electric telescopic rod is located below the side opening, and the output end of the electric telescopic rod is connected to the side sliding plate.

[0013] Preferably, a central gear disc is provided in the transmission case. The rotating rod extends into the transmission case and is connected to the central gear disc. Two sets of transverse movement racks arranged in parallel are located in the transmission case and are meshed with the central gear disc. The middle section of the inclined guide plate is rotatably installed at the end of the reflux enhancement baffle near the liquid collecting port through a central mounting shaft. Limiting sliding grooves are symmetrically arranged on the back of the inclined guide plate with the central mounting shaft as the center. Limiting sliding blocks are slidably connected in the limiting sliding grooves. The limiting sliding blocks are connected to the transverse movement racks. Avoidance holes facilitating the lateral sliding of the limiting sliding blocks are formed in the reflux enhancement baffle.

[0014] Preferably, the attitude adjustment assembly further includes: an adjustment turntable rotatably installed at the side end of the main reactor. The adjustment turntable is located above the side opening. An expansion rod is installed at the end of the rotating rod away from the transmission case. An adjustment screw rod is installed at the end of the expansion rod away from the rotating rod. An adjustment slot facilitating the passing through of the adjustment screw rod is formed in the adjustment turntable. The opening direction of the adjustment slot is set to point to the central end of the adjustment turntable. A fastening nut clamped on the adjustment slot is installed on the adjustment screw rod. A locking assembly for locking the adjustment turntable is further installed on the main reactor. Brief Description of the Drawings

[0015] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0016] Figure 1 is a schematic structural diagram of the present invention;

[0017] Figure 2 is an external view of the aeration ring of the present invention;

[0018] Figure 3 is an assembly schematic diagram of the attitude adjustment assembly and the reflux enhancement baffle of the present invention;

[0019] Figure 4 is a cross-section of the attitude adjustment assembly and the reflux enhancement baffle of the present invention Figure 1 ;

[0020] Figure 5 is Figure 4 a schematic enlarged view of reference numeral A in the figure (in the state where the electric expansion rod is extended);

[0021] Figure 6 is a cross-section of the attitude adjustment assembly and the reflux enhancement baffle of the present invention Figure 2 (in the state where the electric expansion rod is contracted);

[0022] Figure 7 is a schematic structural diagram of the end of the reflux enhancement baffle away from the transmission case of the present invention Figure 1;

[0023] Figure 8 Structural schematic of the end of the reflux-enhancing baffle away from the transmission box of the present invention Figure 2 。

[0024] In the figure: 1. Gas-liquid outlet; 2. Raw water inlet; 3. Reflux-enhancing baffle; 4. Raw water inlet ejector; 5. Liquid collection port; 6. Drainage baffle; 7. Draft tube; 8. Main reactor; 9. Sieve plate; 10. Intake air circulation baffle; 11. Circulating liquid distributor; 12. Gas inlet; 13. Aeration ring; 14. Drainage port; 15. Gas outlet; 16. Side mounting shaft; 17. Inclined draft plate; 18. Attitude adjustment assembly; 19. Side opening; 20. Side sliding plate; 21. Spherical rotating block; 22. Rotating rod; 23. Transmission box; 24. Electric telescopic rod; 25. Central gear disk; 26. Transverse moving rack; 27. Central mounting shaft; 28. Limit chute; 29. Limit slider; 30. Adjusting turntable; 31. Telescopic rod; 32. Adjusting screw; 33. Lock nut. Detailed implementation manners

[0025] The technical solutions of the present invention will be described clearly and completely below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0026] Embodiment

[0027] The present invention will be further described below with reference to the accompanying drawings.

[0028] As Figure 1 、 Figure 2 shown, an apparatus for treating wastewater by adaptive internal circulation wet oxidation provided in this embodiment includes: a main reactor 8 and a draft tube 7 arranged vertically. The draft tube 7 is centrally arranged in the main reactor 8. The liquid collection port 5 is located at the top of the draft tube 7. The reflux-enhancing baffle 3 is installed on the inner wall of the main reactor 8 and is located above the liquid collection port 5. The preheated wastewater is fed into the draft tube 7 from the liquid collection port 5. After forming a high-speed jet, it impacts on the microbubble mixing assembly at the bottom of the draft tube 7. The gas-liquid mixture after impact flows upward between the inner wall of the main reactor 8 and the outer wall of the draft tube 7, and is sent out from the gas-liquid outlet 1 at the top of the main reactor 8.

[0029] The working principle and beneficial effects of the above technical solutions are as follows:

[0030] An apparatus for treating wastewater by adaptive internal circulation wet oxidation provided by the present invention. The preheated wastewater (i.e., low-temperature and high-concentration wastewater) is fed into the draft tube 7 through the self-liquid collection port 5. When a high-speed jet is formed, a large amount of high-temperature and low-concentration treated wastewater located at the top inside the main reactor 8 is introduced through the liquid collection port 5 and the reflux enhancement baffle 3 to spontaneously mix and flow downward together. Then, it impacts on the microbubble mixing assembly located at the bottom inside the main reactor 8 to form a uniform gas-liquid mixture (i.e., a mixture flow of microbubbles and wastewater). After the impact, the gas-liquid mixture flows upward between the inner wall of the main reactor 8 and the outer wall of the draft tube 7 and gathers in the high-temperature and low-concentration treated wastewater at the top inside the main reactor 8. Part of it is sent out from the gas-liquid outlet 1 at the top of the main reactor 8, and the other part is introduced into the draft tube 7 again through the liquid collection port 5 and the reflux enhancement baffle 3, and spontaneously mixes with the high-speed jet and flows downward together. An apparatus for treating wastewater by adaptive internal circulation wet oxidation disclosed by the present invention realizes the spontaneous mixing of high-temperature and low-concentration wastewater and low-temperature and high-concentration raw water by optimizing the internal structure of the existing reactor, significantly increases the initial reaction temperature, accelerates the oxidation reaction rate, and avoids the coking problem caused by local high concentration. This design further prolongs the residence time of the wastewater in the reactor, enhances the gas-liquid mixing efficiency, effectively improves the COD removal rate, and has significant industrial application value.

[0031] In this embodiment, a liquid discharge port 14 is installed at the bottom end of the main reactor 8, and a raw water inlet 2 is installed at a position near the top end on the side of the main reactor 8. The preheated wastewater is fed into the main reactor 8 through the raw water inlet 2. After passing through the reflux enhancement baffle 3, it is fed into the draft tube 7 through the raw water inlet ejector 4 to form a high-speed jet. The liquid jet speed of the raw water inlet ejector 4 is 2.5 - 10 m / s. A gas inlet 12 for supplying gas to the microbubble mixing assembly is installed at a position near the bottom end on the side of the main reactor 8.

[0032] The working principle and beneficial effects of the above technical solution are as follows:

[0033] The preheated wastewater (i.e., low-temperature and high-concentration wastewater) enters the draft tube 7 through the raw water inlet ejector 4 to form a high-speed jet. At the same time, a large amount of high-temperature and low-concentration treated wastewater located at the top inside the main reactor 8 is introduced through the liquid collection port 5 and the reflux enhancement baffle 3 to spontaneously mix and flow downward together, and impacts at high speed on the microbubble mixing assembly fed by the gas inlet 12 and the compressed air ejected by the microbubble mixing assembly to form a uniform mixture flow of microbubbles and wastewater.

[0034] In this embodiment, the diameter of the main reactor 8 is 0.6 - 1.2 m, the height of the main reactor 8 is 10 - 22 m, the height of the draft tube 7 accounts for 60% - 80% of the height of the main reactor 8, and the diameter of the draft tube 7 accounts for 10% - 30% of the diameter of the main reactor 8.

[0035] In this embodiment, a plurality of drainage baffles 6 for preventing the backflow of the gas-liquid mixture are installed on the inner wall of the main reactor 8 from bottom to top.

[0036] The beneficial effects of the above technical solution are as follows:

[0037] The gas-liquid mixture after impact flows upward between the inner wall of the main reactor 8 and the outer wall of the draft tube 7, and the drainage baffle 6 prevents the liquid from flowing back.

[0038] In this embodiment, the sieve plate 9 is sleeved on the draft tube 7 and connected to the inner wall of the main reactor 8. The sieve plate 9 is 1-2 m above the gas inlet 12, and the aperture ratio of the sieve plate 9 is 20%-50%. The gas-liquid mixture is evenly mixed through the sieve plate 19.

[0039] The beneficial effects of the above technical solution are as follows:

[0040] The gas-liquid mixture after impact flows upward between the inner wall of the main reactor 8 and the outer wall of the draft tube 7 and is further evenly mixed through the sieve plate 9.

[0041] In this embodiment, the microbubble mixing assembly includes: a circulating liquid disperser 11, an aeration ring 13, and an intake air circulation baffle 10. The circulating liquid disperser 11 is installed at the bottom end of the draft tube 7. The aeration ring 13 is located below the circulating disperser 11. The gas inlet 12 is communicated with the aeration ring 13. A plurality of air outlets 15 are distributed in a circular array on the aeration ring 13. Air columns are ejected from the air outlets 15. The dispersing port of the circulating liquid disperser 11 impacts the air columns at high speed to form a microbubble and wastewater mixture. The intake air circulation baffle 10 is distributed above the air outlets 15 to extend the residence time of the mixture.

[0042] The working principle and beneficial effects of the above technical solution are as follows:

[0043] The preheated wastewater (i.e., low-temperature and high-concentration wastewater) enters the draft tube 7 through the raw water inlet ejector 4 to form a high-speed jet. At the same time, a large amount of high-temperature and low-concentration treated wastewater located at the top of the main reactor 8 is introduced through the liquid collecting port 5 and the reflux enhancement baffle 3, and spontaneously mixes with the high-speed jet and then flows downward together, and is dispersed from the circulating liquid disperser 11. Compressed air is sent into the aeration ring 13 from the gas inlet 12 and ejected from the air outlets 15 to form air columns. The wastewater impacts the air columns at high speed from the dispersing port of the circulating liquid disperser 11 to form a uniform microbubble and wastewater mixture flow. The intake air circulation baffle 10 extends the residence time of the mixture.

[0044] In this embodiment, the angle of the dispersing port of the circulating liquid disperser 11 is 30-60°, and the angle of the liquid collecting port 5 is 60-75°.

[0045] Such as Figures 3 to 8As shown, in this embodiment, the reflux enhancement baffle 3 is rotatably mounted on the inner wall of the main reactor 8 through a side mounting shaft 16. Two inclined guide plates 17 are installed at the end of the reflux enhancement baffle 3 close to the liquid collection port 5. An attitude adjustment assembly 18 for adjusting the flipping angle of the reflux enhancement baffle 3 is also installed on the main reactor 8. The attitude adjustment assembly 18 is also used to adjust the inclination angle of the inclined guide plate 17. The attitude adjustment assembly 18 includes: a side opening 19 opened on the main reactor 8, a side sliding plate 20 is clamped on the side opening 19, a spherical rotating block 21 is rotatably mounted on the side sliding plate 20, a rotating rod 22 passes through the spherical rotating block 21 and is connected to a transmission box 23 installed at the end of the reflux enhancement baffle 3 away from the liquid collection port 5.

[0046] The working principle and beneficial effects of the above technical solution are as follows:

[0047] The gas-liquid mixture after impact flows upward between the inner wall of the main reactor 8 and the outer wall of the draft tube 7, and accumulates in the high-temperature and low-concentration treated wastewater at the top inside the main reactor 8. Part of it is sent out from the gas-liquid outlet 1 located at the top of the main reactor 8, and the other part is introduced into the draft tube 7 again in cooperation with the liquid collection port 5 and the reflux enhancement baffle 3 and flows downward together after spontaneously mixing along with the high-speed jet. For wastewater with different concentrations, temperatures and flow rates, by adjusting the flipping angle of the reflux enhancement baffle 3 and the inclination angle of the inclined guide plate 17 through the attitude adjustment assembly 18, the larger the downward flipping angle of the reflux enhancement baffle 3, the more wastewater is introduced into the draft tube 7 in cooperation with the liquid collection port 5 and the reflux enhancement baffle 3, and the larger the inclination angle of the inclined guide plate 17, the larger the rotating flow area of the wastewater introduced into the draft tube 7 in cooperation with the liquid collection port 5 and the reflux enhancement baffle 3, thereby increasing the mixing area and promoting the mixing effect in the draft tube 7 by rotating flow.

[0048] Specifically, when the concentration of the low-temperature and high-concentration wastewater is higher, the temperature is lower or the flow rate is larger, it is necessary to extend the residence time in the reactor, enhance the gas-liquid mixing efficiency, and improve the COD removal rate. When the side sliding plate 20 slides downward on the side opening 19, it realizes the upward flipping of the reflux enhancement baffle 3 by using the cooperation of the spherical rotating block 21 and the rotating rod 22. On the contrary, when the side sliding plate 20 slides upward on the side opening 19, it realizes the downward flipping of the reflux enhancement baffle 3, and when the rotating rod 22 rotates, the inclination angle of the inclined guide plate 17 can be adjusted.

[0049] In this embodiment, inner clamping mouths are provided at the top and bottom of the side sliding plate 20. The inner clamping mouths are clamped at the top and bottom of the side opening 19, and the side sliding plate 20 is sealed to the side opening 19. An electric telescopic rod 24 is installed at the side end of the main reactor 8. The electric telescopic rod 24 is located below the side opening 19, and the output end of the electric telescopic rod 24 is connected to the side sliding plate 20.

[0050] The working principle and beneficial effects of the above technical solution are as follows:

[0051] The side slide plate 20 is clamped at the top and bottom of the side opening 19 by the inner clamping openings at its top and bottom. On the basis of being able to block the side opening 19, the side slide plate 20 can also slide up and down within the side opening 19. When the electric telescopic rod 24 extends as shown in Figure 5 the figure, when the side slide plate 20 slides upward on the side opening 19, the downward flipping of the return flow enhancing baffle 3 is realized. And when the electric telescopic rod 24 contracts as shown in Figure 6 the figure, when the side slide plate 20 slides downward on the side opening 19, the upward flipping of the return flow enhancing baffle 3 is realized.

[0052] In this embodiment, a central gear disk 25 is provided in the transmission box 23. The rotating rod 22 extends into the transmission box 23 and is connected to the central gear disk 25. Two sets of transverse movement racks 26 arranged in parallel are located in the transmission box 23 and are meshed with the central gear disk 25. The middle section of the inclined deflector 17 is rotatably installed at the end of the return flow enhancing baffle 3 close to the liquid collecting port 5 through the central mounting shaft 27. Limiting sliding grooves 28 are symmetrically arranged on the back of the inclined deflector 17 with the central mounting shaft 27 as the center. Limiting sliding blocks 29 are slidably connected in the limiting sliding grooves 28. The limiting sliding blocks 29 are connected to the transverse movement racks 26. Avoidance holes for the transverse sliding of the limiting sliding blocks 29 are provided on the return flow enhancing baffle 3. The back of the inclined deflector 17 is the end of the inclined deflector 17 close to the liquid collecting port 5.

[0053] The working principle and beneficial effects of the above technical solution are as follows:

[0054] When it is necessary to adjust the inclination angle of the inclined deflector 17, the rotating rod 22 is rotated. The rotating rod 22 drives the central gear disk 25 located in the transmission box 23 to rotate. The central gear disk 25 drives the two sets of transverse movement racks 26 meshed with it to move synchronously in the direction of approaching or separating from each other. The transverse movement racks 26 drive the two inclined deflectors 17 to rotate synchronously with the central mounting shaft 27 as the center through the cooperation of the limiting sliding blocks 29 and the limiting sliding grooves 28. As shown in Figure 7 the figure, when the two sets of transverse movement racks 26 move synchronously in the direction of approaching each other, the two inclined deflectors 17 tend to be in a vertical state. As shown in Figure 8 the figure, when the two sets of transverse movement racks 26 move synchronously in the direction of separating from each other, the two inclined deflectors 17 tend to be in an inclined state.

[0055] In this embodiment, the attitude adjustment assembly 18 further includes an adjustment turntable 30 rotatably mounted on the side end of the main reactor 8. The adjustment turntable 30 is located above the side opening 19. An expansion rod 31 is installed at the end of the rotating rod 22 away from the transmission box 23, and an adjustment screw 32 is installed at the end of the expansion rod 31 away from the rotating rod 22. An adjustment groove for the adjustment screw 32 to pass through is formed on the adjustment turntable 30. The grooving direction of the adjustment groove points to the central end of the adjustment turntable 30. A fastening nut 33 clamped on the adjustment groove is installed on the adjustment screw 32. A locking assembly for locking the adjustment turntable 30 is also installed on the main reactor 8.

[0056] The working principle and beneficial effects of the above technical solution are as follows:

[0057] After loosening the fastening nuts 33 on each adjustment screw 32, first adjust the reflux enhancement baffle 3 to an appropriate flipping angle through the telescopic movement of the electric telescopic rod 24. In this state, the rotating rod 22 and the adjustment screw 32 both flip in the same plane. Then rotate the adjustment turntable 30 rotatably mounted on the side end of the main reactor 8. By using the cooperation of the adjustment groove and the adjustment screw 32, drive the expansion rod 31 connected to the adjustment screw 32 and the rotating rod 22 connected to the expansion rod 31 to rotate. After the rotating rod 22 rotates, drive the two inclined guide plates 17 to rotate synchronously around the central mounting shaft 27 respectively. After the inclined guide plates 17 rotate to an appropriate angle, the adjustment screw 32 can be clamped in the adjustment groove by the fastening nut 33, and the adjustment turntable 30 can be fixed on the main reactor 8 through the locking assembly.

[0058] Obviously, the above embodiments are merely examples for clear illustration and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. The obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. An apparatus for treating wastewater by adaptive internal circulation wet oxidation, characterized in that, Including: A main reactor (8) and a draft tube (7) arranged vertically. The draft tube (7) is centrally located inside the main reactor (8). The liquid collection port (5) is located at the top of the draft tube (7). The reflux enhancement baffle (3) is installed on the inner wall of the main reactor (8) and is located above the liquid collection port (5). The preheated wastewater is fed into the draft tube (7) from the liquid collection port (5) to form a high-speed jet, which impacts on the microbubble mixing assembly located at the bottom end of the draft tube (7). The gas-liquid mixture after impact flows upward between the inner wall of the main reactor (8) and the outer wall of the draft tube (7), and is sent out from the gas-liquid outlet (1) located at the top of the main reactor (8). The reflux enhancement baffle (3) is rotatably installed on the inner wall of the main reactor (8) through a side mounting shaft (16). Two inclined guide plates (17) are installed at the end of the reflux enhancement baffle (3) close to the liquid collection port (5). An attitude adjustment assembly (18) for adjusting the flipping angle of the reflux enhancement baffle (3) is also installed on the main reactor (8). The attitude adjustment assembly (18) is also used to adjust the inclination angle of the inclined guide plates (17). The attitude adjustment assembly (18) includes: a side opening (19) opened on the main reactor (8), a side sliding plate (20) clamped on the side opening (19), a spherical rotating block (21) rotatably installed on the side sliding plate (20), a rotating rod (22) passing through the spherical rotating block (21) and connected to a transmission box (23) installed at the end of the reflux enhancement baffle (3) away from the liquid collection port (5).

2. The device for treating wastewater by adaptive internal circulation wet oxidation according to claim 1, characterized in that A liquid discharge port (14) is installed at the bottom end of the main reactor (8). A raw water inlet (2) is installed at a position near the top of the side end of the main reactor (8). The preheated wastewater is fed in from the raw water inlet (2). After passing through the reflux enhancement baffle (3), it is fed into the draft tube (7) from the liquid collection port (5) through a raw water inlet ejector (4) to form a high-speed jet. The liquid injection speed of the raw water inlet ejector (4) is 2.5 - 10 m / s. A gas inlet (12) for supplying gas to the microbubble mixing assembly is installed at a position near the bottom of the side end of the main reactor (8).

3. The device for treating wastewater by adaptive internal circulation wet oxidation according to claim 1, characterized in that, The diameter of the main reactor (8) is 0.6 - 1.2 m, the height of the main reactor (8) is 10 - 22 m, the height of the draft tube (7) accounts for 60% - 80% of the height of the main reactor (8), and the diameter of the draft tube (7) accounts for 10% - 30% of the diameter of the main reactor (8).

4. An apparatus for treating wastewater by adaptive internal circulation wet oxidation according to claim 1, characterized in that, Multiple groups of drainage baffles (6) for preventing the reflux of the gas-liquid mixture are installed on the inner wall of the main reactor (8) from bottom to top.

5. An apparatus for treating wastewater by adaptive internal circulation wet oxidation according to claim 2, characterized in that, A sieve plate (9) is sleeved on the draft tube (7) and connected to the inner wall of the main reactor (8). The sieve plate (9) is 1 - 2 m above the gas inlet (12). The opening ratio of the sieve plate (9) is 20% - 50%. The gas-liquid mixture is evenly mixed through the sieve plate (9).

6. The apparatus for treating wastewater by adaptive internal circulation wet oxidation according to claim 2, wherein, The microbubble mixing assembly includes: a circulating liquid disperser (11), an aeration ring (13), and an intake air circulation baffle (10). The circulating liquid disperser (11) is installed at the bottom end of the draft tube (7). The aeration ring (13) is located below the circulating disperser (11). The gas inlet (12) is communicated with the aeration ring (13). A plurality of air outlets (15) are distributed in a circular array on the aeration ring (13). Air columns are ejected from the air outlets (15). The dispersion port of the circulating liquid disperser (11) impacts the high-speed jet onto the air columns to form a mixture of microbubbles and wastewater. The intake air circulation baffle (10) is distributed above the air outlets (15) to extend the residence time of the mixed liquid.

7. An apparatus for treating wastewater by adaptive internal circulation wet oxidation according to claim 1, characterized in that, Inner clamping mouths are provided at both the top end and the bottom end of the side sliding plate (20). The inner clamping mouths are clamped to the top end and the bottom end of the side opening (19). The side sliding plate (20) is arranged to block the side opening (19). An electric telescopic rod (24) is installed at the side end of the main reactor (8). The electric telescopic rod (24) is located below the side opening (19). The output end of the electric telescopic rod (24) is connected to the side sliding plate (20).

8. An apparatus for treating wastewater by adaptive internal circulation wet oxidation according to claim 1, wherein, A central gear disk (25) is provided in the transmission box (23). The rotating rod (22) extends into the transmission box (23) and is connected to the central gear disk (25). Two groups of transverse moving racks (26) arranged in parallel are located in the transmission box (23) and are meshed with the central gear disk (25). The middle section of the inclined deflector (17) is rotationally installed at the end of the reflux enhancement baffle (3) close to the liquid collecting port (5) through a central mounting shaft (27). Limiting sliding grooves (28) are symmetrically arranged on the back of the inclined deflector (17) with the central mounting shaft (27) as the center. A limiting sliding block (29) is slidably connected in the limiting sliding grooves (28). The limiting sliding block (29) is connected to the transverse moving rack (26). Avoidance holes for the transverse sliding of the limiting sliding block (29) are formed in the reflux enhancement baffle (3).

9. An apparatus for treating wastewater by adaptive internal circulation wet oxidation according to claim 1, characterized in that, The attitude adjustment assembly (18) further includes: an adjustment turntable (30) rotationally installed at the side end of the main reactor (8). The adjustment turntable (30) is located above the side opening (19). An expansion rod (31) is installed at the end of the rotating rod (22) away from the transmission box (23). An adjustment screw rod (32) is installed at the end of the expansion rod (31) away from the rotating rod (22). An adjustment groove for the penetration of the adjustment screw rod (32) is formed in the adjustment turntable (30). The opening direction of the adjustment groove is set to point to the central end of the adjustment turntable (30). A locking assembly for locking the adjustment turntable (30) is further installed on the main reactor (8).

Images