Oxidation evaporation device for treating coking desulfurization waste liquid

Abstract

The invention relates to the technical field of waste liquid treatment equipment, and provides a coking desulfurization waste liquid treatment oxidation and evaporation device which comprises a tower body and a partition plate arranged in a tower body cavity, the tower body is divided into an oxidation system and an evaporation system by the partition plate, the oxidation system is arranged below the evaporation system, and the evaporation system is arranged below the tower body. The oxidation system comprises a stirring unit, a spraying unit and an air injection unit, the stirring position of the stirring unit is located below the spraying unit, the spraying unit is located above the liquid level of the waste liquid, the stirring range of the stirring unit is located at the position, close to the liquid level, of the upper layer of the waste liquid, and the air injection unit is located at the bottom layer of the waste liquid; the evaporation unit is communicated to the oxidation system, and waste liquid in the oxidation system is conveyed into the evaporation unit to maintain the liquid level in the oxidation system to be highly stable. Through the technical scheme, the problem that the oxidation efficiency and the cost are difficult to consider in the waste liquid treatment process in the prior art is solved.

Description

Technical Field

[0001] This invention relates to the field of waste liquid treatment equipment technology, specifically to an oxidation evaporation device for treating coking desulfurization waste liquid. Background Technology

[0002] Coking desulfurization wastewater is a highly polluting wastewater generated during the desulfurization process of coal gas in coking plants. Its composition is complex, containing high concentrations of sulfides, ammonia nitrogen, phenols, cyanides, and heavy metals. Direct discharge would severely pollute the environment. Oxidation evaporation is one of the important technologies for treating this wastewater. Its principle lies in using oxidation to decompose toxic substances, followed by evaporation to concentrate and reduce volume, ultimately achieving harmless treatment or resource utilization.

[0003] In existing technologies, oxidation methods involve either blowing in air or adding an oxidant. However, these methods have certain drawbacks. If air is blown in to oxidize the waste liquid, the oxidation efficiency is often low, requiring a relatively long period of continuous air blowing. Using an oxidant is costly, and uneven addition of the oxidant can easily lead to insufficient utilization of the oxidant. If the waste liquid is not fully oxidized, it can easily cause the ammonium thiocyanate to decompose at high temperatures during the evaporation process, producing toxic gases. Therefore, a solution is needed to address these issues. Summary of the Invention

[0004] This invention proposes an oxidation evaporation device for treating coking desulfurization waste liquid, which solves the problem of balancing oxidation efficiency and cost in the existing technology for waste liquid treatment.

[0005] The technical solution of the present invention is as follows: An oxidation evaporation device for treating coking desulfurization wastewater includes a tower body and a partition plate disposed within the tower body cavity. The partition plate divides the tower body into an oxidation system and an evaporation system. The oxidation system is located below the evaporation system and includes a stirring unit, a spraying unit, and an atomizing unit. The stirring unit is positioned below the spraying unit, which is located above the surface of the wastewater. The stirring range of the stirring unit is located in the upper layer of the wastewater, close to the surface. The atomizing unit is located at the bottom layer of the wastewater. The evaporation system includes an evaporation unit connected to the oxidation system. Wastewater from the oxidation system is transported to the evaporation unit to maintain a stable liquid level within the oxidation system.

[0006] The oxidation system includes an oxidation chamber, and a drive partition is provided inside the oxidation chamber. The stirring unit includes a drive motor, a stirring shaft, and multiple stirring blades. The drive motor is located above the drive partition, the stirring shaft is located at the output end of the drive motor and passes through the drive partition, and the stirring blades are circumferentially spaced at the end of the stirring shaft.

[0007] The stirring blades are configured as inclined surfaces, and the stirring blades include positively inclined blades and negatively inclined blades. Within the stirring range of the positively inclined blades, the flow trend of the waste liquid is from bottom to top and from inside to outside along the radial direction. Within the stirring range of the negatively inclined blades, the flow trend of the waste liquid is from top to bottom and from outside to inside along the radial direction.

[0008] The positively tilted blades and the negatively tilted blades are arranged at intervals.

[0009] The jet unit includes at least three jet pipes, the outlets of which are configured to be tangent to a circular trajectory smaller than the bottom of the oxidation chamber.

[0010] The spray unit includes a main spray pipe and a secondary spray pipe. The secondary spray pipe is configured as multiple annular pipes with different radii. The secondary spray pipes are arranged at the same center and are connected to the main spray pipe.

[0011] The evaporation system includes an evaporation chamber with a steam inlet at the bottom and a steam outlet at the top. An evaporation unit is disposed within the evaporation chamber and includes a bottom water collection chamber, a top water collection chamber, and evaporation tubes. Both ends of the plurality of evaporation tubes are connected to the bottom water collection chamber and the top water collection chamber. Both the bottom water collection chamber and the top water collection chamber are provided with vent holes. An evaporation hole is also provided at the top of the top water collection chamber. The bottom water collection chamber is provided with a water inlet, and the top water collection chamber is provided with a water outlet.

[0012] The partition plate includes a first partition and a second partition, and a heat insulation space is provided between the first partition and the second partition, the heat insulation space being connected to the oxidation system.

[0013] The working principle and beneficial effects of this invention are as follows: This invention discloses an oxidation-evaporation device for treating coking desulfurization wastewater. Specifically, it is a comprehensive oxidation-evaporation treatment tower for coking desulfurization wastewater. The tower is equipped with partition plates to form an oxidation system and an evaporation system distributed vertically. Wastewater first enters the oxidation system for oxidation, and then enters the evaporation system for evaporation and concentration. After being discharged from the evaporation system, it undergoes subsequent harmless treatment or resource utilization. Specifically, after the wastewater enters the oxidation system and reaches a certain liquid level, an air jet unit at the bottom of the liquid surface blows in air. Simultaneously, a stirring unit located below the liquid surface but above the wastewater stirs the wastewater. In conjunction with a spray unit located above the liquid surface, the spray unit sprays an oxidant. After preliminary oxidation in the air, the wastewater in the evaporation system... The upper layer of water is mixed with an oxidant and stirred, allowing the wastewater in the upper stirring section to be fully mixed with the oxidant after initial oxidation, achieving efficient oxidation of the upper wastewater layer. At the same time, the wastewater in the oxidation system is continuously transported from the upper layer to the evaporation unit to maintain the stability of the wastewater level in the oxidation system. The wastewater is then evaporated and concentrated in the evaporation system. Through the above scheme, on the one hand, the dynamic coordination of the oxidation system and the evaporation system ensures continuous and efficient oxidation of the wastewater, improving the utilization rate of the oxidant. On the other hand, through local stirring and local extraction, a more effective oxidation effect can be obtained with a lower amount of oxidant added and a shorter cycle of air injection time. Thus, the shortcomings of the existing technology are solved by using a comprehensive and interconnected technical solution. Attached Figure Description

[0014] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0015] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the present invention; In the diagram: 1. Tower body, 2. Divider plate, 3. Oxidation system, 4. Evaporation system, 5. Stirring unit, 6. Spraying unit, 7. Jet jetting unit, 8. Evaporation unit, 9. Oxidation chamber, 10. Drive partition plate, 11. Drive motor, 12. Stirring shaft, 13. Stirring blades, 14. Positively inclined blades, 15. Negatively inclined blades, 16. Jet jetting pipe, 17. Main spraying pipe, 18. Secondary spraying pipe, 19. Evaporation chamber, 20. Steam inlet, 21. Steam outlet, 22. Bottom water collection chamber, 23. Top water collection chamber, 24. Evaporation pipe, 25. Air passage hole, 26. Evaporation hole, 27. Water inlet, 28. Water outlet, 29. First partition plate, 30. Second partition plate, 31. Insulated space. Detailed Implementation

[0016] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0017] like Figures 1-2 As shown in the figure, this embodiment proposes an oxidation evaporation device for treating coking desulfurization wastewater. The oxidation evaporation device includes a tower body 1 and a partition plate 2 disposed in the cavity of the tower body 1. The partition plate 2 divides the tower body 1 into an oxidation system 3 and an evaporation system 4. The oxidation system 3 is disposed below the evaporation system 4. The oxidation system 3 includes a stirring unit 5, a spraying unit 6, and an air jetting unit 7. The stirring position of the stirring unit 5 is located below the spraying unit 6, and the spraying unit 6 is located above the liquid surface of the wastewater. The stirring range of the stirring unit 5 is located in the upper layer of the wastewater near the liquid surface. The air jetting unit 7 is located at the bottom layer of the wastewater. The evaporation system 4 includes an evaporation unit 8, which is connected to the oxidation system 3. The wastewater in the oxidation system 3 is transported to the evaporation unit 8 to maintain the liquid level height in the oxidation system 3.

[0018] This embodiment discloses an oxidation-evaporation device for treating coking desulfurization wastewater. Specifically, it is a comprehensive oxidation-evaporation treatment tower for coking desulfurization wastewater. A partition plate 2 is installed inside the tower body 1, forming an oxidation system 3 and an evaporation system 4 distributed vertically. Wastewater first enters the oxidation system 3 for oxidation, and after oxidation, it enters the evaporation system 4 for evaporation and concentration. After being discharged from the evaporation system 4, it undergoes subsequent harmless treatment or resource utilization. Specifically, after the wastewater enters the oxidation system 3 and reaches a certain liquid level, air is blown in by the jet unit 7 located at the bottom of the liquid surface. The liquid level can be controlled by a level gauge. Simultaneously, a stirring unit located below the liquid surface but above the wastewater... Unit 5 agitates the wastewater, and in conjunction with the spray unit 6 located above the liquid surface, the spray unit 6 sprays an oxidant. It should be noted that the amount of oxidant sprayed is much smaller than that used when using oxidant alone. After the wastewater undergoes preliminary oxidation in the air, the upper layer of the wastewater is agitated with the oxidant. Thus, the wastewater in the upper agitated section can be fully mixed with the oxidant on the basis of preliminary oxidation, achieving efficient oxidation of the upper part of the wastewater. At the same time, wastewater can be added at the bottom of the oxidation system 3. The wastewater in the oxidation system 3 is continuously transported from the upper position to the evaporation unit 8 to maintain the stability of the wastewater liquid level in the oxidation system 3. The wastewater is evaporated and concentrated in the evaporation system 4.

[0019] The oxidation system 3 includes an oxidation chamber 9, and a drive partition 10 is provided inside the oxidation chamber 9. The stirring unit 5 includes a drive motor 11, a stirring shaft 12, and a plurality of stirring blades 13. The drive motor 11 is located above the drive partition 10. The stirring shaft 12 is located at the output end of the drive motor 11 and passes through the drive partition 10. The stirring blades 13 are circumferentially spaced at the ends of the stirring shaft 12.

[0020] In this embodiment, the oxidation system 3 is provided with an oxidation chamber 9, and the stirring unit 5 is specifically a drive motor 11 that drives the stirring shaft 12 to rotate. The stirring blades on the stirring shaft 12 stir the upper layer of waste liquid evenly. A drive partition 10 is provided to isolate the drive motor 11 to a separate space for protection and to facilitate maintenance.

[0021] The stirring blade 13 is configured as an inclined surface. The stirring blade 13 includes a positively inclined blade 14 and a negatively inclined blade 15. Within the stirring range of the positively inclined blade 14, the flow trend of the waste liquid is from bottom to top and from inside to outside along the radial direction. Within the stirring range of the negatively inclined blade 15, the flow trend of the waste liquid is from top to bottom and from outside to inside along the radial direction.

[0022] In this embodiment, the stirring blade 13 is set as an inclined surface, and the stirring blade 13 is at a certain angle to the horizontal plane. The angle between the stirring blade 13 and the horizontal plane gradually increases or decreases from the inner connecting section to the outer end, thereby achieving different stirring effects. The stirring blade 13 can be divided into positively inclined blade 14 and negatively inclined blade 15. The positively inclined blade 14 can make the waste liquid pushed by the stirring flow from the bottom edge of the blade to the top edge of the blade. At the same time, the waste liquid also flows from the inner connecting end of the blade to the outer free end along the radius direction of the tower body 1 from the inside to the outside. The negatively inclined blade can make the waste liquid pushed by the stirring flow from the top edge of the blade to the bottom edge of the blade. At the same time, the waste liquid also flows from the outer free end to the inner connecting end of the blade along the radius direction of the tower body 1 from the outside to the inside. Thus, the stirring blade 13 can turn and stir the liquid in the upper layer of the waste liquid up and down and inside and outside. With the oxidant spray unit 6 at the top of the waste liquid, the air at the bottom is initially oxidized, so that the upper layer of the waste liquid is fully and efficiently oxidized, saving oxidant and reducing cost. Compared with simple air oxidation, the cycle is shortened and the efficiency is improved.

[0023] The positive tilting blade 14 and the negative tilting blade 15 are arranged at intervals.

[0024] In this embodiment, the positively inclined blade 14 and the negatively inclined blade 15 are alternately arranged. During the stirring process, the waste liquid is in a continuous up-and-down and in-and-out flow process, which improves uniformity and allows for full utilization of the oxidant with the use of a small amount of sprayed oxidant, thereby improving the utilization rate and maximizing utilization.

[0025] The jet unit 7 includes at least three jet pipes 16, the outlets of which are configured to be tangent to a circular trajectory smaller than the bottom of the oxidation chamber 9.

[0026] In this embodiment, the jet direction of the jet pipe 16 at the bottom of the oxidation chamber 9 is tangent to the circular trajectory. The injected air enters the waste liquid in a swirling manner, which can agitate the waste liquid while preventing the air from rising directly vertically, allowing it to fully contact the waste liquid and improve the degree of oxidation in the initial oxidation.

[0027] The spray unit 6 includes a main spray pipe 17 and a secondary spray pipe 18. The secondary spray pipe 18 is configured as multiple annular pipes with different radii. The secondary spray pipes 18 are arranged at the same center and are connected to the main spray pipe 17.

[0028] In this embodiment, the main spray pipe 17 passes through the tower body 1 and delivers the oxidant into the tower. The main spray pipe 17 is connected to the annular secondary spray pipe 18, which covers the surface of the waste liquid and sprays it evenly.

[0029] The evaporation system 4 includes an evaporation chamber 19, with a steam inlet 20 at the bottom and a steam outlet 21 at the top. The evaporation unit 8 is disposed within the evaporation chamber 19. The evaporation unit 8 includes a bottom water collection chamber 22, a top water collection chamber 23, and evaporation tubes 24. Both ends of the plurality of evaporation tubes 24 are connected to the bottom water collection chamber 22 and the top water collection chamber 23. Both the bottom water collection chamber 22 and the top water collection chamber 23 are provided with vent holes 25. The top of the top water collection chamber 23 is also provided with an evaporation hole 26. The bottom water collection chamber 22 is provided with a water inlet 27, and the top water collection chamber 23 is provided with a water outlet 28.

[0030] In this embodiment, when the evaporation system 4 is working, high-temperature steam is introduced into the evaporation chamber 19. The high-temperature steam further vaporizes and concentrates the oxidized wastewater in the evaporation unit 8. Specifically, the evaporation unit 8 connects multiple evaporation pipes 24 through the bottom water collection chamber 22 and the top water collection chamber 23. The inlet 27 of the bottom water collection chamber 22 is connected to the outlet of the upper layer of waste liquid in the oxidation system 3. A water pump can be set to transport the wastewater to the bottom water collection chamber 22. The wastewater will pass through multiple evaporation pipes 24 and finally enter the oxidation system. The top water collection chamber 23, after evaporation and concentration, enters the subsequent process through the outlet 28. The bottom water collection chamber 22 is provided with an air passage 25. Steam is transferred through the air passage 25 to the bottom water collection chamber 22, the evaporation tube 24 and the top water collection chamber 23 at high temperature, so that the water in the wastewater is vaporized to achieve the purpose of concentration. The vaporized wastewater is discharged from the evaporation hole 26 on the top water collection chamber 23. There is a steam outlet 21 at the top of the evaporation chamber 19 to discharge part of the steam after heat exchange. The condensed steam can be discharged from the bottom of the evaporation chamber 19.

[0031] The partition plate 2 includes a first partition plate 29 and a second partition plate 30. A heat insulation space 31 is provided between the first partition plate 29 and the second partition plate 30. The heat insulation space 31 is connected to the oxidation system 3.

[0032] In this embodiment, the evaporation system 4 and the oxidation system 3 are functionally complementary, but they need to be separated by a partition plate 2. Furthermore, a first partition plate 29 and a second partition plate 30 are adopted, with a heat insulation space 31 formed in the middle. The air in the oxidation system 3 is connected to the heat insulation space 31 through a pipeline to carry away the heat and exhaust it outside the tower, thereby achieving heat isolation and preventing the oxidation effect in the oxidation chamber 9 from being affected by high temperature.

[0033] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An oxidation evaporation device for treating coking desulfurization wastewater, characterized in that, The oxidation evaporation device includes a tower body (1) and a partition plate (2) disposed in the cavity of the tower body (1). The partition plate (2) divides the tower body (1) into an oxidation system (3) and an evaporation system (4). The oxidation system (3) is disposed below the evaporation system (4). The oxidation system (3) includes a stirring unit (5), a spraying unit (6), and an air jetting unit (7). The stirring position of the stirring unit (5) is located below the spraying unit (6). The spraying unit (6) is located above the liquid surface of the waste liquid. The stirring range of the stirring unit (5) is located in the upper layer of the waste liquid near the liquid surface. The air jetting unit (7) is located at the bottom layer of the waste liquid. The evaporation system (4) includes an evaporation unit (8). The evaporation unit (8) is connected to the oxidation system (3). The waste liquid in the oxidation system (3) is transported to the evaporation unit (8) to maintain the liquid level height in the oxidation system (3) stable.

2. The oxidation evaporation device for treating coking desulfurization wastewater according to claim 1, characterized in that, The oxidation system (3) includes an oxidation chamber (9), and a drive partition (10) is provided inside the oxidation chamber (9). The stirring unit (5) includes a drive motor (11), a stirring shaft (12) and multiple stirring blades (13). The drive motor (11) is located above the drive partition (10). The stirring shaft (12) is located at the output end of the drive motor (11) and passes through the drive partition (10). The stirring blades (13) are circumferentially spaced at the ends of the stirring shaft (12).

3. The oxidation evaporation device for treating coking desulfurization wastewater according to claim 2, characterized in that, The stirring blade (13) is set as an inclined surface. The stirring blade (13) includes a positively inclined blade (14) and a negatively inclined blade (15). Within the stirring range of the positively inclined blade (14), the flow trend of the waste liquid is from bottom to top and from inside to outside along the radial direction. Within the stirring range of the negatively inclined blade (15), the flow trend of the waste liquid is from top to bottom and from outside to inside along the radial direction.

4. The oxidation evaporation device for treating coking desulfurization wastewater according to claim 3, characterized in that, The positive tilting blade (14) and the negative tilting blade (15) are arranged at intervals.

5. The oxidation evaporation device for treating coking desulfurization wastewater according to claim 4, characterized in that, The jet unit (7) includes at least three jet pipes (16), the outlet of which is configured to be tangent to a circular trajectory smaller than the bottom of the oxidation chamber (9).

6. The oxidation evaporation device for treating coking desulfurization wastewater according to claim 5, characterized in that, The spray unit (6) includes a main spray pipe (17) and a secondary spray pipe (18). The secondary spray pipe (18) is configured as multiple annular pipes with different radii. The secondary spray pipe (18) is arranged at the same center and is connected to the main spray pipe (17).

7. The oxidation evaporation device for treating coking desulfurization wastewater according to claim 1, characterized in that, The evaporation system (4) includes an evaporation chamber (19), a steam inlet (20) at the bottom of the evaporation chamber (19), a steam outlet (21) at the top of the evaporation chamber (19), and an evaporation unit (8) disposed in the evaporation chamber (19). The evaporation unit (8) includes a bottom water collection chamber (22), a top water collection chamber (23), and evaporation tubes (24). Both ends of the multiple evaporation tubes (24) are connected to the bottom water collection chamber (22) and the top water collection chamber (23). Both the bottom water collection chamber (22) and the top water collection chamber (23) are provided with vent holes (25). The top of the top water collection chamber (23) is also provided with an evaporation hole (26). The bottom water collection chamber (22) is provided with a water inlet (27), and the top water collection chamber (23) is provided with a water outlet (28).

8. The oxidation evaporation device for treating coking desulfurization wastewater according to claim 1, characterized in that, The partition plate (2) includes a first partition plate (29) and a second partition plate (30), and a heat insulation space (31) is provided between the first partition plate (29) and the second partition plate (30), and the heat insulation space (31) is connected to the oxidation system (3).

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