Biochemical treatment device for papermaking wastewater

Abstract

The utility model discloses a biochemical treatment device for papermaking wastewater, which relates to the technical field of papermaking wastewater treatment and comprises an equipment box, a precipitation cavity and an adjusting cavity are arranged in the equipment box, a water inlet is arranged at the upper part in the precipitation cavity, a filtering component is arranged in the water inlet, and a cleaning mechanism is arranged at the bottom of the precipitation cavity. A stirring mechanism is arranged in the adjusting cavity; a drainage pipe is fixedly connected to the bottom of the adjusting cavity; an adjusting valve is arranged on the drainage pipe; one end, far away from the adjusting cavity, of the drainage pipe is communicated with the reaction box; a water outlet is formed in the bottom of the reaction box and is provided with a regulating valve. The device is easy to operate, an automatic control system is adopted, operation is easy and convenient, and labor cost and operation difficulty are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of papermaking wastewater treatment, in particular to a biochemical treatment device for papermaking wastewater. Background Technique

[0002] The wastewater generated by the papermaking industry has the characteristics of complex composition, low biodegradability, and high content of organic pollutants, and belongs to one of the industrial wastewaters that are difficult to treat.

[0003] Traditional wastewater treatment methods are difficult to meet the treatment requirements of wastewater with high organic matter concentration during treatment, resulting in poor sewage treatment effect, unqualified discharged sewage quality, and affecting environmental quality. For this reason, technical personnel in this field have proposed a biochemical treatment device for papermaking wastewater to solve the problems raised in the above background. Content of the Utility Model

[0004] The purpose of the utility model is to provide a biochemical treatment device for papermaking wastewater to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] A biochemical treatment device for papermaking wastewater includes an equipment box. Inside the equipment box, there are a precipitation chamber and an adjustment chamber. Above the precipitation chamber, there is a water inlet. Inside the water inlet, there is a filtering component. At the bottom of the precipitation chamber, there is a cleaning mechanism. The side wall of the precipitation chamber is connected to the adjustment chamber through a water pump. On the side wall of the adjustment chamber, there is an aeration head. Inside the adjustment chamber, there is a stirring mechanism. At the bottom of the adjustment chamber, there is a drain pipe fixedly connected. On the drain pipe, there is a regulating valve. One end of the drain pipe far away from the adjustment chamber is connected to a reaction tank. Above the reaction tank, there is an oxygen control component. At the bottom of the reaction tank, there is a water outlet. On the water outlet, there is a regulating valve.

[0007] As a further scheme of the utility model: The bottom of the equipment box is fixedly connected with several support columns. Outside the equipment box, there is an adjustment touch panel. On the outer side wall of the adjustment chamber, there is a feeding box. The feeding box is connected to the inside of the adjustment chamber. At the bottom of one side of the precipitation chamber, there is a sewage outlet. The bottom of the precipitation chamber and the reaction tank are provided with filter mesh covers.

[0008] As a still further scheme of the utility model: The filtering component includes a first motor fixed above the water inlet. The first motor is rotationally connected with a lead screw. The lead screw is threadedly connected with a filtering frame. On the filtering frame, there is a filtering plate fixedly connected. On the side of the filtering frame far away from the lead screw, there is a guide rod slidably connected. At both ends of the lead screw and the guide rod, there are limit blocks.

[0009] As a further solution of the utility model: the cleaning mechanism includes a transmission shaft coaxially connected to the screw rod, an adjusting gear is fixedly connected to the bottom of the transmission shaft, the adjusting gear is meshed with the driven gear, an adjusting rod is fixedly connected to the driven gear, a fixing bar is rotatably connected to the upper end of the adjusting rod, a rotating sleeve is fixedly connected to the end of the fixing bar away from the adjusting rod, the rotating sleeve is sleeved on the transmission shaft, and the rotating sleeve is rotatably connected to the transmission shaft.

[0010] As a further solution of the utility model: the lower end of the adjusting rod is fixedly connected with a rotating bar, the rotating bar is fixedly connected with a toggle rod, a pushing block is arranged at the bottom of the sedimentation chamber, a strip-shaped through hole is fixedly connected above the pushing block, one end of the toggle rod is arranged inside the strip-shaped through hole, a sliding block is arranged at the end of the pushing block away from the filter cover net, a sliding groove is fixedly connected with the end of the bottom of the sedimentation chamber away from the filter cover net, the sliding block is slidably connected inside the sliding groove, and the pushing block cooperates with the sewage outlet.

[0011] As a further solution of the utility model: the stirring mechanism includes a second motor fixedly connected to the bottom of the equipment box, the second motor is rotatably connected to a stirring shaft, the stirring shaft is rotatably connected to the equipment box, and a plurality of stirring rollers are arranged on the stirring shaft.

[0012] As a further solution of the utility model: the oxygen control component includes an oxygen exhaust pipe connected to the interior of the reaction box, one end of the oxygen exhaust pipe is fixedly connected to an oxygen exhaust pump, the oxygen exhaust pump is fixedly connected to the top of the reaction box, an oxygen extraction pipe is arranged at one end of the oxygen exhaust pipe away from the oxygen exhaust pump, the end of the oxygen extraction pipe away from the oxygen exhaust pump is connected to the oxygen extraction pump, and the oxygen extraction pump is fixedly connected to the outer wall of the reaction box.

[0013] Compared with the prior art, the beneficial effects of the utility model are: 1. The utility model is simple to operate and adopts an automated control system, which is easy to operate and reduces labor costs and operating difficulties; 2. It is efficient and convenient. Through the combined action of several cavities, wastewater can be treated more quickly, and the manual treatment process is reduced, thereby improving wastewater treatment efficiency and the quality standard of treated water; 3. It has a reasonable structure, a compact device structure, a high degree of automation, and is suitable for treating papermaking wastewater; 4. It has strong adaptability: the device can be adjusted and optimized according to different water qualities and treatment requirements, and has strong adaptability and flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The present invention is a schematic diagram of the structure of a biochemical treatment device for papermaking wastewater;

[0015] Figure 2 It is a schematic diagram of the structure of a filter component of a biochemical treatment device for papermaking wastewater;

[0016] Figure 3 It is a schematic diagram of the cleaning mechanism structure of a papermaking wastewater biochemical treatment device;

[0017] In the figure: 1. Equipment box; 2. Precipitation chamber; 3. Adjustment chamber; 4. Water inlet; 5. Filter assembly; 6. Cleaning mechanism; 7. Water pump; 8. Aeration head; 9. Stirring mechanism; 10. Drain pipe; 11. Control valve; 12. Reaction tank; 13. Oxygen control assembly; 14. Water outlet; 15. Support column; 16. Adjustment touch panel; 17. Feeding box; 18. Sewage outlet; 19. Filter cover net; 20. First motor; 21. Lead screw; 22. Filter frame; 23. Filter plate; 24. Guide rod; 25. Limit block; 26. Transmission shaft; 27. Adjusting gear; 28. Driven gear; 29. Adjusting rod; 30. Fixed strip; 31. Rotating sleeve; 32. Rotating strip; 33. Poking rod; 34. Pushing block; 35. Strip-shaped through hole; 36. Slide block; 37. Slide groove; 38. Second motor; 39. Stirring shaft; 40. Stirring roller; 41. Oxygen discharge pipe; 42. Oxygen discharge pump; 43. Oxygen extraction pipe; 44. Oxygen extraction tank. Detailed implementation mode

[0018] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0019] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more.

[0020] In the description of the present utility model, it should be noted that, unless otherwise clearly defined and limited, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood through specific situations.

[0021] The present utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0022] Example 1:

[0023] Please refer to Figures 1-3 , including the equipment box 1, characterized in that a sedimentation chamber 2 and an adjustment chamber 3 are arranged inside the equipment box 1, a water inlet 4 is arranged above the inside of the sedimentation chamber 2, a filtering component 5 is arranged inside the water inlet 4, a cleaning mechanism 6 is arranged at the bottom of the sedimentation chamber 2, the side wall of the sedimentation chamber 2 is communicated with the adjustment chamber 3 through a water pump 7, an aeration head 8 is arranged on the side wall of the adjustment chamber 3, a stirring mechanism 9 is arranged inside the adjustment chamber 3, a drain pipe 10 is fixedly connected to the bottom of the adjustment chamber 3, a regulating valve 11 is arranged on the drain pipe 10, one end of the drain pipe 10 away from the adjustment chamber 3 is communicated with a reaction tank 12, an oxygen control component 13 is arranged above the reaction tank 12, a water outlet 14 is arranged at the bottom of the reaction tank 12, and a regulating valve 11 is arranged on the water outlet 14.

[0024] A plurality of support columns 15 are fixedly connected to the bottom of the equipment box 1, an adjustment touch panel 16 is arranged outside the equipment box 1, a feeding box 17 is arranged on the outer side wall of the adjustment chamber 3, and the feeding box 17 is communicated with the inside of the adjustment chamber 3. A sewage outlet 18 is arranged at the bottom of one side of the sedimentation chamber 2, and filter mesh covers 19 are arranged at the bottom of the sedimentation chamber 2 and the reaction tank 12.

[0025] The filtering component 5 includes a first motor 20 fixed above the water inlet 4, the first motor 20 is rotationally connected with a lead screw 21, the lead screw 21 is in threaded connection with a filter frame 22, a filter plate 23 is fixedly connected to the filter frame 22, a guide rod 24 is slidably connected to one side of the filter frame 22 away from the lead screw 21, and limit blocks 25 are arranged at both ends of the lead screw 21 and the guide rod 24.

[0026] First, pour the wastewater into the sedimentation chamber 2 from the water inlet 4. When pouring the wastewater, the filtering component 5 at the water inlet 4 screens out large impurities on the filter plate 23, and the wastewater then enters the sedimentation chamber 2. After sedimentation, a certain amount of wastewater is controlled by the water pump 7 to enter the adjustment chamber 3. After the wastewater enters the adjustment chamber 3, start the first motor 20, and the first motor 20 drives the filter frame 22 to rise. After rising to a suitable position, it is convenient for the operator to clean the large impurities on the filter plate 23.

[0027] Example 2:

[0028] Please refer to Figures 1-3, including an equipment box 1, characterized in that a precipitation chamber 2 and an adjustment chamber 3 are arranged inside the equipment box 1. An inlet 4 is arranged above the interior of the precipitation chamber 2, and a filtering component 5 is arranged inside the inlet 4. A cleaning mechanism 6 is arranged at the bottom of the precipitation chamber 2. The side wall of the precipitation chamber 2 is communicated with the adjustment chamber 3 through a water pump 7. An aeration head 8 is arranged on the side wall of the adjustment chamber 3. A stirring mechanism 9 is arranged inside the adjustment chamber 3. A drain pipe 10 is fixedly connected to the bottom of the adjustment chamber 3. A regulating valve 11 is arranged on the drain pipe 10. One end of the drain pipe 10 away from the adjustment chamber 3 is communicated with a reaction tank 12. An oxygen control component 13 is arranged above the reaction tank 12. An outlet 14 is arranged at the bottom of the reaction tank 12. A regulating valve 11 is arranged on the outlet 14.

[0029] Several support columns 15 are fixedly connected to the bottom of the equipment box 1. An adjustment touch panel 16 is arranged outside the equipment box 1. A feeding box 17 is arranged on the outer side wall of the adjustment chamber 3. The feeding box 17 is communicated with the interior of the adjustment chamber 3. A sewage outlet 18 is arranged at the bottom on one side of the precipitation chamber 2. Filtering net covers 19 are arranged at the bottom of the precipitation chamber 2 and on the reaction tank 12.

[0030] The filtering component 5 includes a first motor 20 fixed above the inlet 4. The first motor 20 is rotationally connected to a lead screw 21. The lead screw 21 is threadedly connected to a filter frame 22. A filter plate 23 is fixedly connected to the filter frame 22. A guide rod 24 is slidably connected to one side of the filter frame 22 away from the lead screw 21. Limit blocks 25 are arranged at both ends of the lead screw 21 and the guide rod 24.

[0031] First, pour the wastewater into the precipitation chamber 2 from the inlet 4. When pouring the wastewater, the filtering component 5 at the inlet 4 screens out large impurities on the filter plate 23, and the wastewater then enters the precipitation chamber 2. After precipitation, a certain amount of wastewater is controlled by the water pump 7 to enter the adjustment chamber 3. After the wastewater enters the adjustment chamber 3, start the first motor 20. The first motor 20 drives the filter frame 22 to rise. After rising to a suitable position, it is convenient for the operator to clean the large impurities on the filter plate 23.

[0032] The cleaning mechanism 6 includes a transmission shaft 26 coaxially connected to the lead screw 21. A regulating gear 27 is fixedly connected to the bottom of the transmission shaft 26. The regulating gear 27 meshes with a driven gear 28. An adjusting rod 29 is fixedly connected to the driven gear 28. The upper end of the adjusting rod 29 is rotationally connected to a fixing strip 30. One end of the fixing strip 30 away from the adjusting rod 29 is fixedly connected to a rotating sleeve 31. The rotating sleeve 31 is sleeved on the transmission shaft 26, and the rotating sleeve 31 is rotationally connected to the transmission shaft 26.

[0033] The lower end of the adjusting rod 29 is fixedly connected to a rotating bar 32, and the rotating bar 32 is fixedly connected to a toggle rod 33. A pushing block 34 is provided at the bottom of the sedimentation chamber 2, and a strip through hole 35 is fixedly connected above the pushing block 34. One end of the toggle rod 33 is provided inside the strip through hole 35. A sliding block 36 is provided at the end of the pushing block 34 away from the filter cover net 19. A sliding groove 37 is fixedly connected to the end of the bottom of the sedimentation box away from the filter cover net 19. The sliding block 36 is slidably connected inside the sliding groove 37, and the pushing block 34 cooperates with the sewage outlet 18.

[0034] When the first motor 20 is started, the sewage outlet 18 is opened, and the cleaning mechanism 6 starts to work. The adjusting gear 27 drives the driven gear 28 to rotate, so that the rotating bar 32 starts to rotate, and the toggle rod 33 on the rotating bar 32 toggles the bar-shaped through hole 35. The bar-shaped through hole 35 drives the pushing block 34 to move from the sewage outlet 18 away from the sewage outlet 18 along the slide groove 37 to the sewage outlet 18, so as to push out the dirt that has settled to the bottom.

[0035] The stirring mechanism 9 includes a second motor 38 fixedly connected to the bottom of the equipment box 1 , the second motor 38 is rotatably connected to a stirring shaft 39 , the stirring shaft 39 is rotatably connected to the equipment box 1 , and a plurality of stirring rollers 40 are arranged on the stirring shaft 39 .

[0036] After the wastewater enters the regulating chamber 3, the appropriate regulator is first added to the wastewater by adjusting the touch panel 16 to control the adding box 17 to regulate the wastewater. While regulating, the wastewater is stirred by the stirring mechanism 9 to speed up the reaction. Then, air is injected into the aeration head 8 through the air compressor to promote the growth and metabolic activity of microorganisms on the biofilm, thereby degrading pollutants such as organic matter and ammonia nitrogen in the wastewater.

[0037] The oxygen control component 13 includes an oxygen exhaust pipe 41 connected to the inside of the reaction box 12, one end of the oxygen exhaust pipe 41 is fixedly connected to an oxygen exhaust pump 42, the oxygen exhaust pump 42 is fixedly connected to the top of the reaction box 12, an oxygen extraction pipe 43 is provided at the end of the oxygen exhaust pump 42 away from the oxygen exhaust pipe 41, the end of the oxygen extraction pipe 43 away from the oxygen exhaust pump 42 is connected to an oxygen extraction tank 44, and the oxygen extraction tank 44 is fixedly connected to the outer wall of the reaction box 12.

[0038] Finally, the regulating valve 11 is opened, and the wastewater enters the reaction box 12 through the drain pipe 10. The oxygen exhaust pump 42 is started, and the oxygen content in the reaction box 12 is controlled by the oxygen control component 13 to create an aerobic and anaerobic environment, so that the wastewater undergoes denitrification reaction in the anaerobic section to remove nitrate nitrogen; and undergoes nitrification reaction and organic matter degradation in the aerobic section, while removing phosphorus elements, and is discharged from the outlet 14 after filtration.

[0039] The working principle of the utility model is:

[0040] First, pour the wastewater into the sedimentation chamber 2 from the water inlet 4. When pouring the wastewater, the filtering component 5 at the water inlet 4 screens out large impurities on the filter plate 23, and the wastewater then enters the sedimentation chamber 2. After sedimentation, a certain amount of wastewater is controlled by the water pump 7 to enter the adjustment chamber 3. After the wastewater enters the adjustment chamber 3, start the first motor 20. The first motor 20 drives the filter frame 22 to rise. After rising to an appropriate position, it is convenient for the operator to clean the large impurities on the filter plate 23. While starting the first motor 20, open the sewage outlet 18, and the cleaning mechanism 6 starts to work. The adjusting gear 27 drives the driven gear 28 to rotate, and then the rotating bar 32 starts to rotate. The toggle rod 33 on the rotating bar 32 toggles the strip-shaped through hole 35, and the strip-shaped through hole 35 drives the pushing block 34 to move from a position far away from the sewage outlet 18 along the sliding groove 37 towards the sewage outlet 18, pushing out the dirt settled at the bottom. After the wastewater enters the adjustment chamber 3, first, control the dosing box 17 to add an appropriate amount of regulator to the wastewater through the adjustment touch panel 16 to adjust the wastewater. While adjusting, stir the wastewater through the stirring mechanism 9 to accelerate the reaction speed. Then, inject air into the aeration head 8 through the air compressor to promote the growth and metabolic activities of microorganisms on the biofilm, thereby degrading pollutants such as organic matter and ammonia nitrogen in the wastewater. Finally, open the regulating valve 11, and the wastewater enters the reaction tank 12 through the drain pipe 10. Start the oxygen discharge pump 42, and control the oxygen content in the reaction tank 12 through the oxygen control component 13 to create aerobic and anaerobic environments, enabling the wastewater to carry out denitrification reaction in the anaerobic section to remove nitrate nitrogen; carry out nitrification reaction and organic matter degradation in the aerobic section, and simultaneously remove phosphorus elements, and then discharge from the water outlet 14 after filtration.

[0041] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-described exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be encompassed within the present utility model. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0042] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A biochemical treatment device for papermaking wastewater, comprising an equipment box (1), characterized in that: The equipment box (1) is provided with a sedimentation chamber (2) and a regulating chamber (3). A water inlet (4) is provided above the sedimentation chamber (2). A filter assembly (5) is provided inside the water inlet (4). A cleaning mechanism (6) is provided at the bottom of the sedimentation chamber (2). The side wall of the sedimentation chamber (2) is connected to the regulating chamber (3) through a water pump (7). An aeration head (8) is provided on the side wall of the regulating chamber (3). A stirring mechanism (9) is provided inside the regulating chamber (3). A drainage pipe (10) is fixedly connected to the bottom of the regulating chamber (3). A regulating valve (11) is provided on the drainage pipe (10). One end of the drainage pipe (10) away from the regulating chamber (3) is connected to a reaction box (12). An oxygen control assembly (13) is provided above the reaction box (12). A water outlet (14) is provided at the bottom of the reaction box (12). A regulating valve (11) is provided on the water outlet (14).

2. The biochemical treatment device for papermaking wastewater according to claim 1 is characterized in that: The bottom of the equipment box (1) is fixedly connected to a plurality of support columns (15); an adjustment touch panel (16) is arranged outside the equipment box (1); a feeding box (17) is arranged on the outer wall of the adjustment chamber (3); the feeding box (17) is communicated with the inside of the adjustment chamber (3); a sewage outlet (18) is arranged at the bottom of one side of the precipitation chamber (2); and a filter cover net (19) is arranged at the bottom of the precipitation chamber (2) and the reaction box (12).

3. The biochemical treatment device for papermaking wastewater according to claim 2 is characterized in that: The filter assembly (5) comprises a first motor (20) fixed above the water inlet (4); the first motor (20) is rotatably connected to a screw rod (21); the screw rod (21) is threadedly connected to a filter frame (22); a filter plate (23) is fixedly connected to the filter frame (22); a guide rod (24) is slidably connected to a side of the filter frame (22) away from the screw rod (21); and limit blocks (25) are provided at both ends of the screw rod (21) and the guide rod (24).

4. The biochemical treatment device for papermaking wastewater according to claim 3 is characterized in that: The cleaning mechanism (6) comprises a transmission shaft (26) coaxially connected to the screw rod (21); an adjusting gear (27) is fixedly connected to the bottom of the transmission shaft (26); the adjusting gear (27) is meshed with a driven gear (28); an adjusting rod (29) is fixedly connected to the driven gear (28); a fixing bar (30) is rotatably connected to the upper end of the adjusting rod (29); a rotating sleeve (31) is fixedly connected to the end of the fixing bar (30) away from the adjusting rod (29); the rotating sleeve (31) is sleeved on the transmission shaft (26); and the rotating sleeve (31) is rotatably connected to the transmission shaft (26).

5. The biochemical treatment device for papermaking wastewater according to claim 4 is characterized in that: The lower end of the adjusting rod (29) is fixedly connected with a rotating bar (32), and the rotating bar (32) is fixedly connected with a toggle rod (33). The bottom of the sedimentation chamber (2) is provided with a pushing block (34), and the top of the pushing block (34) is fixedly connected with a strip-shaped through hole (35). One end of the toggle rod (33) is arranged inside the strip-shaped through hole (35). The pushing block (34) is provided with a sliding block (36) at one end away from the filter cover net (19). The bottom of the sedimentation box is fixedly connected with a sliding groove (37) at one end away from the filter cover net (19). The sliding block (36) is slidably connected inside the sliding groove (37). The pushing block (34) cooperates with the sewage outlet (18).

6. The biochemical treatment device for papermaking wastewater according to claim 1 is characterized in that: The stirring mechanism (9) comprises a second motor (38) fixedly connected to the bottom of the equipment box (1); the second motor (38) is rotatably connected to a stirring shaft (39); the stirring shaft (39) is rotatably connected to the equipment box (1); and a plurality of stirring rollers (40) are arranged on the stirring shaft (39).

7. The biochemical treatment device for papermaking wastewater according to claim 1 is characterized in that: The oxygen control component (13) comprises an oxygen exhaust pipe (41) connected to the interior of the reaction box (12); one end of the oxygen exhaust pipe (41) is fixedly connected to an oxygen exhaust pump (42); the oxygen exhaust pump (42) is fixedly connected to the top of the reaction box (12); an oxygen extraction pipe (43) is arranged at one end of the oxygen exhaust pump (42) away from the oxygen exhaust pipe (41); one end of the oxygen extraction pipe (43) away from the oxygen exhaust pump (42) is connected to an oxygen extraction tank (44); and the oxygen extraction tank (44) is fixedly connected to the outer wall of the reaction box (12).

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