Multi-stage purification device for sulfur-free expandable graphite purification waste gas

Abstract

The invention relates to the technical field of waste gas purification, and discloses a multi-stage purification device for sulfur-free expandable graphite purified waste gas, the multi-stage purification device comprises a cooling and dedusting tank, a first spraying and purifying tank, a second spraying and purifying tank and a waste gas detection box which are arranged in sequence, and the cooling and dedusting tank is used for cooling and dedusting the sulfur-free expandable graphite purified waste gas; the first spraying purification tank and the second spraying purification tank are used for spraying washing liquid to the waste gas to remove harmful substances in the waste gas; the waste gas detection box is used for detecting the concentration of harmful substances in waste gas, and the two gas outlet ends of the waste gas detection box are connected with the exhaust pipe and a gas inlet pipeline of the spraying purification tank correspondingly. According to the invention, multi-stage purification of waste gas is effectively realized, and the purification effect is improved; the waste gas detection box is adopted to detect the concentration of harmful substances in the purified waste gas, and when the waste gas does not meet the emission standard, the waste gas flows back into the spraying purification tank to be sprayed and purified again, so that the influence of waste gas emission on the environment and human bodies is reduced, and the purpose of green production is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of waste gas purification, and more particularly to a multi-stage purification device for purifying waste gas using sulfur-free expandable graphite. Background Art

[0002] Expandable graphite is a graphite product obtained by using large flake graphite as raw material and undergoing special chemical or electrochemical treatment. It can expand instantly when exposed to high temperature, and the expansion multiple can reach 150-400 times, changing from flake to worm-like, thus becoming loose in structure. It is porous and curved, with a large specific surface area, high specific energy, strong adsorption force, and the worm-like graphite can be embedded by itself. This increases its softness, resilience and processability, and it is a material for producing flexible graphite sheets and various seals. It can also be used as a lubricant additive, a heat preservation additive for the metallurgical industry, an additive for fire protection, a flame retardant material for low-temperature expandable graphite for battery adsorption materials, etc. In the production process of expandable graphite, the graphite needs to be purified to obtain low-sulfur or sulfur-free expandable graphite products, and waste gas will inevitably be generated during the purification process.

[0003] In the prior art, for example, the utility model patent with application number CN202323225611.X discloses a graphite purification waste gas purification device, including a first cooling mechanism, a second cooling mechanism, a washing barrel and a water storage tank. The utility model cools the graphite purified waste gas twice by the first cooling mechanism and the second cooling mechanism to avoid a large temperature difference in a single cooling, which puts a heavy burden on the equipment. The cooled waste gas passes through a dust collector to remove dust from the graphite powder contained in the waste gas. The waste gas after dust removal is introduced into an aeration pipe through an air pipe. The waste gas enters the washing liquid in the washing barrel through the aeration pipe for washing. The washed tail gas enters a spray tank. The pump body transports the washing liquid in the washing barrel to the spray pipe. The spray pipe sprays the washing liquid and contacts the washed tail gas again for washing. The sprayed tail gas is introduced into the water in the water storage tank through the air pipe to achieve re-washing of the tail gas. The washed tail gas is discharged from the exhaust port. After multiple washings, the purification rate is greatly improved.

[0004] Although the above-mentioned device washes and purifies the graphite purification waste gas multiple times, the waste gas is not tested before discharge and there is no guarantee that it can meet the emission standards.

[0005] Therefore, it is necessary to propose a multi-stage purification device for purifying waste gas using sulfur-free expandable graphite to at least partially solve the problems existing in the prior art. Summary of the invention

[0006] A series of simplified concepts are introduced in the Summary of the Invention, which will be further described in detail in the Detailed Description of the Invention. The Summary of the Invention does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0007] In order to at least partially solve the above problems, the present invention provides a multi-stage purification device for sulfur-free expandable graphite purifying waste gas, comprising: A cooling and dust removal tank, a first spray purification tank, a second spray purification tank and an exhaust gas detection box are arranged in sequence. The cooling and dust removal tank is used for cooling and dust removal of sulfur-free expandable graphite purified exhaust gas; the first spray purification tank and the second spray purification tank are used for spraying washing liquid on the exhaust gas to remove harmful substances in the exhaust gas; the exhaust gas detection box is used for detecting the concentration of harmful substances in the exhaust gas, and the two outlet ends of the exhaust gas detection box are respectively connected to the exhaust pipe and the air inlet pipeline of the spray purification tank.

[0008] Preferably, the multi-stage purification device for purifying waste gas from sulfur-free expandable graphite also includes a waste gas purification pipeline and a waste gas circulation pipeline, the waste gas purification pipeline connecting the air outlet of the cooling and dust removal tank and the air inlet of the first spray purification tank, the air outlet of the first spray purification tank and the air inlet of the second spray purification tank, the air outlet of the second spray purification tank and the air inlet of the waste gas detection box, the first air outlet of the waste gas detection box and the exhaust pipe; the waste gas circulation pipeline connects the second air outlet of the waste gas detection box and the air inlet of the first spray purification tank, the second air outlet of the waste gas detection box and the air inlet of the second spray purification tank.

[0009] Preferably, a first electrically controlled valve is provided on the exhaust gas detection box, a second electrically controlled valve is provided on the exhaust gas circulation pipeline, and the first electrically controlled valve, the second electrically controlled valve and the exhaust gas detection box are all electrically connected to the controller.

[0010] Preferably, the controller controls the on / off state of the first electrically controlled valve and the second electrically controlled valve according to the detection result of the exhaust gas detection box, specifically: When the concentration of harmful substances in the exhaust gas detection box is less than a first preset concentration value, the first gas outlet of the first electric control valve is opened to discharge the exhaust gas through the exhaust pipe; When the concentration of harmful substances in the exhaust gas detection box is greater than a first preset concentration value, the second gas outlet of the first electric control valve is opened to allow the exhaust gas to flow into the exhaust gas circulation pipeline; When the concentration of harmful substances in the exhaust gas detection box is greater than a second preset concentration value, the first air outlet of the second electric control valve is opened to allow the exhaust gas to flow into the air inlet of the first spray purification tank; When the concentration of harmful substances in the exhaust gas detection box is greater than the first preset concentration value and less than the second preset concentration value, the second air outlet of the second electrically controlled valve is opened to allow the exhaust gas to flow into the air inlet of the second spray purification tank.

[0011] Preferably, the cooling and dust removal tank comprises: The outer shell and the inner shell are concentrically arranged, an exhaust gas flow channel is formed between the outer shell and the inner shell, the top of the inner shell extends out of the outer shell, the top of the inner shell is provided with an exhaust gas inlet, the bottom of the outer shell is provided with an exhaust gas outlet, and the side wall of the inner shell is provided with a through hole communicating with the outer shell; A cooling jacket and an upper cooling jacket, wherein the cooling jacket is sleeved on the outer side of the outer shell, and the upper cooling jacket is sleeved on the outer side of the inner shell, and a cooling liquid pipe is arranged around the cooling jacket and the upper cooling jacket, and the cooling liquid pipe is connected to a cooling liquid supply device; The filter cover is arranged in the exhaust gas flow channel, and the inner and outer edges of the filter cover are respectively connected to the inner shell and the outer shell, and the filter holes are evenly arranged on the filter cover.

[0012] Preferably, a guide column is provided on the upper part of the inner shell body, and the guide column is concentrically arranged in the inner shell body. The guide column includes an upper cylindrical section and a lower conical section. The top edge of the cylindrical section is provided with a conical surface, and the bottom end of the conical surface of the conical section corresponds to the lower edge of the through hole.

[0013] Preferably, an exhaust gas slow flow plate is arranged in the outer shell, and the inner and outer edges of the exhaust gas slow flow plate are respectively connected to the inner shell and the outer shell, and the exhaust gas slow flow plate is arranged in a spiral shape, and the bottom air outlet end of the exhaust gas slow flow plate is directly opposite to the exhaust gas outlet.

[0014] Preferably, a plurality of inner baffles and outer baffles are arranged on the upper surface of the exhaust gas slow flow plate, the inner baffles are connected to the inner side of the exhaust gas slow flow plate and connected to the inner shell body; the outer baffles are connected to the outer side of the exhaust gas slow flow plate and connected to the outer shell body, and the inner baffles and the outer baffles are arranged alternately.

[0015] Preferably, the cooling and dust removal tank further includes an ash discharge unit, which includes: A blocking ring, the blocking ring is slidably connected to the outer wall of the inner shell, the top of the blocking ring is connected to the inner edge of the filter cover, the filter cover is conical and the inner edge is lower than the outer edge, and the inner edge of the filter cover is lower than the lower edge of the through hole; The ash discharge hole is provided on the inner shell through the ash discharge hole, the ash discharge hole is lower than the filter cover and is blocked by the inner side of the blocking ring; A counterweight ring is slidably connected to the inner wall of the inner shell, and the counterweight ring is connected to the sealing ring through a first pull rope, and the first pull rope passes through the ash discharge hole.

[0016] Preferably, the ash removal unit further comprises: A plug, which is slidably connected to the inner wall of the inner shell and is located below the counterweight ring; A tension spring is connected to the bottom end of the guide column and is connected to the plug through a second pull rope.

[0017] Preferably, the plug is provided with an upper conical section, a disc section and a lower conical section in sequence from top to bottom, the bottom end diameter of the upper conical section is larger than the top end diameter, and the upper conical section is connected to the second pull rope; the disc section is slidingly connected to the inner wall of the inner shell; the bottom end diameter of the lower conical section is smaller than the top end diameter, and the volume of the lower conical section is larger than the volume of the upper conical section.

[0018] Preferably, a swirl unit is connected to the top of the guide column, and the swirl unit includes: Motor, the motor is installed on the top of the inner wall of the guide column; A rotating shaft is rotatably connected to the top of the guide column and connected to the output shaft of the motor; The swirl block is connected to the top of the rotating shaft, and the swirl block is set to be conical, and the center of the top of the swirl block is evenly connected with a swirl plate.

[0019] Preferably, the swirl block further comprises: Dispersion columns, multiple dispersion columns are evenly connected to the conical surface of the swirl block; A support ring, the support ring is concentrically connected to the outer side of the swirl block through a connecting rod; A first curved rod, the top end of which is connected to the bottom end of the swirl block, and the first curved rod is bent outward; An annular seat, which is connected to the bottom end of the first curved rod and has magnetism; A flexible membrane, the top of which is connected to the edge of the swirl block, and the flexible membrane is located outside the first curved rod; A magnetic block, the magnetic block is connected to the bottom end of the flexible film, and the magnetic block and the annular seat attract each other; A second curved rod, the top end of which is connected to the bottom end of the swirl block and is arranged outside the first curved rod, and the bottom end of the second curved rod is in contact with the flexible membrane; A connecting rope, one end of which is connected to the magnetic block, and the other end of which passes through the supporting ring and is connected to the sphere.

[0020] Compared with the prior art, the present invention has at least the following beneficial effects: The multi-stage purification device for waste gas purified by sulfur-free expandable graphite provided by the present invention allows waste gas generated during the purification of sulfur-free expandable graphite to be introduced into the device, and sequentially passes through a cooling and dust removal tank, a first spray purification tank, and a second spray purification tank, respectively performing cooling and dust removal and two spray treatments, thereby effectively realizing multi-stage purification of the waste gas and improving the purification effect; a waste gas detection box is used to detect the concentration of harmful substances in the purified waste gas, and when the waste gas does not meet the emission standards, it is refluxed into the spray purification tank for spray purification again, thereby improving the treatment effect of the waste gas purified by sulfur-free expandable graphite, reducing the impact of waste gas emissions on the environment and human body, and achieving the purpose of green production.

[0021] The multi-stage purification device for purifying waste gas with sulfur-free expandable graphite described in the present invention, other advantages, objectives and features of the present invention will be reflected in part through the following description, and in part will be understood by technicians in this field through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a schematic diagram of the cross-sectional structure of the cooling and dust removal tank in the present invention; Figure 3 It is a schematic diagram of the cross-sectional structure of the cooling and dust removal tank in the present invention; Figure 4 It is a schematic diagram of the transverse cross-sectional structure of the cooling and dust removal tank at the exhaust gas slow flow plate in the present invention; Figure 5 For the present invention Figure 3 A schematic diagram of the local enlarged structure at point A in the middle; Figure 6 It is a schematic diagram of the structure of the plug in the present invention; Figure 7 It is a schematic diagram of the cross-sectional structure of the swirl block in the present invention; Figure 8 It is a schematic diagram of the local structure of the edge of the swirl block in the present invention.

[0023] In the figure: 1. Cooling and dust removal tank; 2. First spray purification tank; 3. Second spray purification tank; 4. Waste gas detection box; 5. Waste gas purification pipeline; 6. Waste gas circulation pipeline; 7. First electric control valve; 8. Second electric control valve; 11. Outer shell; 12. Inner shell; 13. Waste gas inlet; 14. Waste gas outlet; 15. Cooling jacket; 16. Upper cooling jacket; 17. Filter cover; 18. Guide column; 19. Waste gas slow flow plate; 21. Inner baffle plate; 22. Outer baffle plate; 23. Sealing ring; 24. Ash discharge hole; 25. Counterweight ring; 26. First pull rope; 27. Plug; 28. Tension spring; 30. Swirl plate; 31. Motor; 32. Rotating shaft; 33. Swirl block; 34. Dispersion column; 35. Support ring; 36. Connecting rod; 37. First curved rod; 38. Annular seat; 39. Flexible membrane; 41. Magnetic block; 42. Second curved rod; 43. Connecting rope; 44. Sphere. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments so that those skilled in the art can implement the invention with reference to the description.

[0025] It should be understood that terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or more other elements or combinations thereof.

[0026] Example 1 like Figure 1 As shown, the present invention provides a multi-stage purification device for sulfur-free expandable graphite to purify waste gas, comprising: A cooling and dust removal tank 1, a first spray purification tank 2, a second spray purification tank 3 and an exhaust gas detection box 4 are arranged in sequence. The cooling and dust removal tank 1 is used to cool and remove dust from the sulfur-free expandable graphite purified exhaust gas; the first spray purification tank 2 and the second spray purification tank 3 are used to spray washing liquid on the exhaust gas to remove harmful substances in the exhaust gas; the exhaust gas detection box 4 is used to detect the concentration of harmful substances in the exhaust gas, and the two air outlet ends of the exhaust gas detection box 4 are respectively connected to the exhaust pipe and the air inlet pipeline of the spray purification tank.

[0027] The working principle and beneficial effects of the above technical solution are: A multi-stage purification device for waste gas from sulfur-free expandable graphite purification. When in use, the waste gas generated during the purification of the sulfur-free expandable graphite is introduced into the device, and sequentially passes through a cooling and dust removal tank 1, a first spray purification tank 2, and a second spray purification tank 3, respectively, for cooling and dust removal and two spray treatments, thereby effectively achieving multi-stage purification of the waste gas and improving the purification effect; a waste gas detection box 4 is used to detect the concentration of harmful substances in the purified waste gas, and when the waste gas does not meet the emission standards, it is returned to the spray purification tank for spray purification again, thereby improving the treatment effect of the waste gas from the purification of sulfur-free expandable graphite, reducing the impact of waste gas emissions on the environment and human body, and achieving the purpose of green production.

[0028] Example 2 like Figure 1 As shown, on the basis of the above-mentioned embodiment 1, the multi-stage purification device for purifying waste gas from sulfur-free expandable graphite also includes a waste gas purification pipeline 5 and a waste gas circulation pipeline 6, the waste gas purification pipeline 5 connects the air outlet of the cooling and dust removal tank 1 and the air inlet of the first spray purification tank 2, the air outlet of the first spray purification tank 2 and the air inlet of the second spray purification tank 3, the air outlet of the second spray purification tank 3 and the air inlet of the waste gas detection box 4, the first air outlet of the waste gas detection box 4 and the exhaust pipe; the waste gas circulation pipeline 6 connects the second air outlet of the waste gas detection box 4 and the air inlet of the first spray purification tank 2, the second air outlet of the waste gas detection box 4 and the air inlet of the second spray purification tank 3.

[0029] The working principle and beneficial effects of the above technical solution are: A pump body is arranged on the exhaust gas purification pipeline 5, and the exhaust gas purification pipeline 5 provides a channel for the forward flow process of the exhaust gas between the cooling and dust removal tank 1, the first spray purification tank 2, the second spray purification tank 3 and the exhaust gas detection box 4; a pump body is arranged on the exhaust gas circulation pipeline 6, and the exhaust gas circulation pipeline 6 provides a channel for the reverse flow process of the exhaust gas flowing back from the exhaust gas detection box 4 to the first spray purification tank 2 and the second spray purification tank 3.

[0030] Example 3 like Figure 1 As shown, on the basis of the above-mentioned embodiment 2, a first electrically controlled valve 7 is provided on the exhaust gas detection box 4, and a second electrically controlled valve 8 is provided on the exhaust gas circulation pipeline 6. The first electrically controlled valve 7, the second electrically controlled valve 8 and the exhaust gas detection box 4 are all electrically connected to the controller.

[0031] The controller controls the on / off state of the first electrically controlled valve 7 and the second electrically controlled valve 8 according to the detection result of the exhaust gas detection box 4, specifically: When the concentration of harmful substances in the exhaust gas detection box 4 is less than the first preset concentration value, the first gas outlet of the first electric control valve 7 is opened to discharge the exhaust gas through the exhaust pipe; When the concentration of harmful substances in the exhaust gas detection box 4 is greater than the first preset concentration value, the second gas outlet of the first electric control valve 7 is opened to allow the exhaust gas to flow into the exhaust gas circulation pipeline 6; When the concentration of harmful substances in the exhaust gas detection box 4 is greater than the second preset concentration value, the first gas outlet of the second electric control valve 7 is opened to allow the exhaust gas to flow into the gas inlet of the first spray purification tank 2; When the concentration of harmful substances in the exhaust gas detection box 4 is greater than the first preset concentration value and less than the second preset concentration value, the second gas outlet of the second electric control valve 7 is opened to allow the exhaust gas to flow into the gas inlet of the second spray purification tank 3.

[0032] The working principle and beneficial effects of the above technical solution are: A gas concentration detector is provided in the exhaust gas detection box 4 , and the controller controls the exhaust gas emission and circulation purification process according to the detection result of the harmful substance concentration in the exhaust gas detection box 4 .

[0033] When the concentration of harmful substances in the exhaust gas detection box 4 is less than the first preset concentration value, it indicates that the concentration of harmful substances in the exhaust gas has been purified to within the allowable range of the emission standard, and the first outlet of the first electrically controlled valve 7 is opened to discharge the exhaust gas directly to the external environment; When the concentration of harmful substances in the exhaust gas detection box 4 is greater than the first preset concentration value, it indicates that the concentration of harmful substances in the exhaust gas does not meet the emission standard, and the second outlet of the first electrically controlled valve 7 is opened to allow the exhaust gas to reflux for circulation purification; and according to the specific concentration value, it is determined whether to perform two-stage spray purification or one-stage spray purification after the circulation. Specifically, when the concentration of harmful substances in the exhaust gas detection box 4 is greater than the second preset concentration value, the first air outlet of the second electrically controlled valve 7 is opened to allow the exhaust gas to flow into the air inlet of the first spray purification tank 2; this allows the exhaust gas to pass through the first spray purification tank 2 and then enter the second spray purification tank 3, including two levels of spray purification, and the circulation purification effect is better; When the concentration of harmful substances in the exhaust gas detection box 4 is greater than the first preset concentration value and less than the second preset concentration value, the second air outlet of the second electrically controlled valve 7 is opened to allow the exhaust gas to flow into the air inlet of the second spray purification tank 3; this allows the exhaust gas to directly enter the second spray purification tank 3, including a total of one level of spray purification, reducing the load of the first spray purification tank 2 and improving the purification efficiency.

[0034] Example 4 like Figure 2 , 3 As shown, based on the above embodiment 1, the cooling and dust removal tank 1 includes: The outer shell 11 and the inner shell 12 are concentrically arranged, and an exhaust gas flow channel is formed between the outer shell 11 and the inner shell 12. The top of the inner shell 12 extends out of the outer shell 11. The top of the inner shell 12 is provided with an exhaust gas inlet 13, and the bottom of the outer shell 11 is provided with an exhaust gas outlet 14. The side wall of the inner shell 12 is provided with a through hole communicating with the outer shell 11; A cooling jacket 15 and an upper cooling jacket 16, wherein the cooling jacket 15 is sleeved on the outer side of the outer shell 11, and the upper cooling jacket 16 is sleeved on the outer side of the inner shell 12, and a cooling liquid pipe is arranged around the cooling jacket 15 and the upper cooling jacket 16, and the cooling liquid pipe is connected to a cooling liquid supply device; The filter cover 17 is arranged in the exhaust gas flow channel, and the inner and outer edges of the filter cover 17 are respectively connected to the inner shell 12 and the outer shell 11, and the filter cover 17 is evenly provided with filter holes.

[0035] The working principle and beneficial effects of the above technical solution are: When the cooling dust removal tank 1 is used, the exhaust gas is introduced from the exhaust gas inlet 13 at the top of the inner shell 12, the exhaust gas flows in the inner shell 12, and then enters the air flow channel between the outer shell 11 and the inner shell 12 through the through hole, and the graphite particles mixed in the exhaust gas are filtered out through the filter cover 17, and then the exhaust gas flows out through the outlet 14 at the bottom of the outer shell 11. During the flow of the exhaust gas in the inner shell 12, the exhaust gas contacts the inner shell 12 to transfer heat to the upper cooling jacket 16; during the flow of the exhaust gas in the outer shell 11, the exhaust gas contacts the outer shell 11 to transfer heat to the lower cooling jacket 15; the coolant flows in the lower cooling jacket 15 and the upper cooling jacket 16 to extract the heat, thereby achieving the purpose of cooling.

[0036] Through the above-mentioned structural design, a cooling component and a dust removal component are arranged in the cooling and dust removal tank 1, which improves the integration of the cooling and dust removal pipe 1, effectively releases the occupied area of ​​the purification device, and reduces the purification cost; the cooling component in the cooling and dust removal pipe 1 is arranged in a two-stage cooling mode, and cools the inner shell 12 and the outer shell 11 respectively, reducing the load of single-stage cooling, improving the cooling effect of the exhaust gas, and facilitating subsequent spray purification.

[0037] Embodiment 5: like Figure 2 , 3 As shown, on the basis of the above-mentioned embodiment 4, a guide column 18 is arranged on the upper part of the inner shell 12, and the guide column 18 is concentrically arranged in the inner shell 12. The guide column 18 includes an upper cylindrical section and a lower conical section. A conical surface is arranged on the top edge of the cylindrical section, and the bottom end of the conical surface of the conical section corresponds to the lower edge of the through hole.

[0038] The working principle and beneficial effects of the above technical solution are: The inner shell 12 is provided with a guide column 18. After the exhaust gas enters the inner shell 12, it flows into the air flow channel between the inner shell 12 and the guide column 18 under the guiding effect of the conical surface at the top edge of the guide column 12, so that the exhaust gas is concentrated on the side wall of the inner shell 12, thereby improving the heat exchange effect between the exhaust gas and the cooling jacket 16 on the outer side of the inner shell 12; the conical section at the bottom of the guide column 18 can guide the exhaust gas flow into the outer shell 11.

[0039] Example 6 like Figure 2-4 As shown, on the basis of the above-mentioned embodiment 4, an exhaust gas slow flow plate 19 is arranged in the outer shell 11, and the inner and outer edges of the exhaust gas slow flow plate 19 are respectively connected to the inner shell 12 and the outer shell 11, and the exhaust gas slow flow plate 19 is arranged in a spiral shape, and the bottom air outlet end of the exhaust gas slow flow plate 19 is opposite to the exhaust gas outlet 14.

[0040] The working principle and beneficial effects of the above technical solution are: An exhaust gas slow flow plate 19 is arranged between the outer shell 11 and the inner shell 12, and the exhaust gas slow flow plate 19, the outer shell 11 and the inner shell 12 form a spiral airflow channel; when the exhaust gas flows in the outer shell 11, it flows along the spiral surface of the exhaust gas slow flow plate 19, which extends the flow path of the exhaust gas, so that the exhaust gas can fully contact the outer wall of the outer shell 11, and better exchange heat with the cooling jacket 15, thereby improving the cooling effect of the exhaust gas.

[0041] Example 7 like Figure 4As shown, on the basis of the above-mentioned embodiment 6, a plurality of inner baffles 21 and outer baffles 22 are arranged on the upper surface of the exhaust gas slow flow plate 19, the inner baffles 21 are connected to the inner side of the exhaust gas slow flow plate 19, and are connected to the inner shell 12; the outer baffles 22 are connected to the outer side of the exhaust gas slow flow plate 19, and are connected to the outer shell 11, and the inner baffles 21 and the outer baffles 22 are arranged alternately.

[0042] The working principle and beneficial effects of the above technical solution are: When the exhaust gas flows along the spiral surface of the exhaust gas slow flow plate 19, under the blocking effect of the inner baffle plate 21 and the outer baffle plate 22, it flows along the gap between the inner baffle plate 21 and the outer baffle plate 22, frequently changing the air flow direction, further slowing down the flow speed of the exhaust gas, so that the exhaust gas can fully contact the outer wall of the outer shell 11, better exchange heat with the cooling jacket 15, and improve the cooling effect of the exhaust gas.

[0043] Example 8 like Figure 2 , 3 As shown in , 5, based on the above-mentioned embodiment 4, the cooling and dust removal tank 1 also includes an ash discharge unit, and the ash discharge unit includes: A blocking ring 23, the blocking ring 23 is slidably connected to the outer wall of the inner shell 12, the top of the blocking ring 23 is connected to the inner edge of the filter cover 17, the filter cover 17 is conical and the inner edge is lower than the outer edge, and the inner edge of the filter cover 17 is lower than the lower edge of the through hole; The ash discharge hole 24 is provided through the inner shell 12 , and the ash discharge hole 24 is lower than the filter cover 17 and is blocked by the inner side of the blocking ring 23 ; A weight ring 25, the weight ring 25 is slidably connected to the inner wall of the inner shell 12, the weight ring 25 is connected to the blocking ring 23 through a first pull rope 26, and the first pull rope 26 passes through the ash discharge hole 25; A plug 27, which is slidably connected to the inner wall of the inner shell 12 and is located below the counterweight ring 25; The tension spring 28 is connected to the bottom end of the guide column 18 , and the tension spring 27 is connected to the plug 27 through a second pull rope 28 .

[0044] The working principle and beneficial effects of the above technical solution are: The dust and graphite particles mixed in the exhaust gas are filtered by the filter cover 17. The filtered dust and graphite particles slide along the conical surface of the filter cover 17 to its inner edge and accumulate at the connection between the filter cover 17 and the inner shell 12. When the accumulated dust and graphite particles exceed the preset weight, the sum of the weight of the accumulated material, the weight of the filter cover 17, the weight of the blocking ring 23 and the exhaust gas flow above the filter cover 17 is greater than the weight of the counterweight ring 25, the blocking ring 23 slides downward along the outer wall of the inner shell 12, and the counterweight ring 25 is pulled upward by the first pull rope 26. The blocking ring 23 exposes the ash discharge hole 24, and the accumulated dust and graphite particles fall into the inner shell 12 through the ash discharge hole 24 and fall above the plug 27. A sensor is set on the outer wall of the inner shell 12. When the upper edge of the blocking ring 23 moves close to the upper edge of the ash discharge hole 24, it contacts the sensor. The controller receives the detection signal of the sensor, closes the air intake valve of the cooling and dust removal pipe 1, and stops air intake.

[0045] When the accumulated dust and graphite particles fall into the inner shell 12 through the ash discharge hole 24, the sum of the weight of the deposit, the weight of the filter cover 17, the weight of the sealing ring 23 and the exhaust gas flow above the filter cover 17 is less than the weight of the counterweight ring 25. Under the action of the gravity of the counterweight ring 25, the sealing ring 23 is pulled upward to re-seal the ash discharge hole 24; the controller opens the air intake valve of the cooling and dust removal pipe 1 to continue air intake.

[0046] Through the above-mentioned structural design, when the filtered dust and graphite particles exceed the preset weight, they can be automatically discharged from the filter cover 17, ensuring that the deposits on the filter cover 17 are within a controllable range, effectively reducing the risk of clogging of the filter cover 17, and improving the dust removal effect on the exhaust gas; the deposit discharge process is carried out automatically, without the need for manual shutdown for cleaning, reducing the dust removal workload and operation risks.

[0047] Embodiment 9: like Figure 6 As shown, on the basis of the above-mentioned embodiment 8, the plug 27 is provided with an upper conical section, a disc section and a lower conical section from top to bottom in sequence, the bottom end diameter of the upper conical section is larger than the top end diameter, the upper conical section is connected to the second pull rope 28; the disc section is slidably connected to the inner wall of the inner shell 12; the bottom end diameter of the lower conical section is smaller than the top end diameter, and the volume of the lower conical section is larger than the volume of the upper conical section.

[0048] The working principle and beneficial effects of the above technical solution are: When the deposits above the plug 27 gradually increase, the pressure on the plug 27 increases, and the plug 27 extends by pulling the tension spring through the second pull rope 28; when the deposits reach the preset weight, the disc section of the plug 27 separates from the inner shell 12, and the deposits slide down the inclined surface of the upper conical section and are discharged through the ash discharge port at the bottom end of the outer shell 11; the setting of the upper conical section can make the ash discharge more complete; the weight of the lower conical section is greater than that of the upper conical section, which can move the center of the plug 27 downward, ensure the stability of the center of gravity of the plug 27, and reduce the jamming during the movement of the plug 27.

[0049] Embodiment 10: like Figure 2 , 3 As shown, based on the above-mentioned embodiment 4, a swirl unit is connected to the top of the guide column 18, and the swirl unit includes: The motor 31 is mounted on the top of the inner wall of the guide column 18; The rotating shaft 32 is rotatably connected to the top of the guide column 18 and connected to the output shaft of the motor 31; The swirl block 33 is connected to the top of the rotating shaft 32 and is configured to be conical. The top center of the swirl block 33 is evenly connected with the swirl plate 30 .

[0050] The working principle and beneficial effects of the above technical solution are: When the swirl unit is in use, the starting motor 31 drives the rotating shaft 32 to rotate, and the rotating shaft 32 drives the swirl block 33 to rotate. When the swirl block 33 rotates, it disturbs the exhaust gas flow, causing the exhaust gas to produce a swirl, which is fully in contact with the inner wall of the inner shell 12, thereby improving the cooling effect; the swirl plate 30 on the swirl block 33 can improve the disturbance effect on the exhaust gas flow.

[0051] Embodiment 11: like Figure 7 , 8 As shown, based on the above embodiment 10, the swirl block 33 also includes: Dispersion columns 34, a plurality of dispersion columns 34 are evenly connected to the conical surface of the swirl block 33; A support ring 35, the support ring 35 is concentrically connected to the outer side of the swirl block 33 through a connecting rod 36; A first curved rod 37, the top end of the first curved rod 37 is connected to the bottom end of the swirl block 33, and the first curved rod 37 is bent outward; An annular seat 38, the annular seat 38 is connected to the bottom end of the first curved rod 37, and the annular seat 38 is magnetic; A flexible membrane 39, the top of which is connected to the edge of the swirl block 33, and the flexible membrane 39 is located outside the first curved rod 37; A magnetic block 41, the magnetic block 41 is connected to the bottom end of the flexible membrane 39, and the magnetic block 41 and the annular seat 38 attract each other; A second curved rod 42, the top end of which is connected to the bottom end of the swirl block 33 and is arranged outside the first curved rod 37, and the bottom end of the second curved rod 42 is in contact with the flexible membrane 39; A connecting rope 43 , one end of which is connected to the magnetic block 41 , and the other end of which passes through the supporting ring 35 and is connected to the sphere 44 .

[0052] The working principle and beneficial effects of the above technical solution are: When the exhaust gas flows into the inner shell 12, the airflow impacts the swirl block 33 and collides with the dispersion column 34 on the swirl block 33. Some of the heavier dust and graphite particles in the airflow are separated from the airflow and fall on the surface of the swirl block 33. When the swirl block 33 rotates, they move to the edge under the action of centrifugal force. The sphere 44 at the edge of the swirl block 33 moves outward under the action of centrifugal force and pulls the magnet 41 through the connecting rope 43. Under the action of traction and centrifugal force, the magnet 41 overcomes the magnetic force of the annular seat 38 and moves outward. The magnet 41 pulls the bottom end of the flexible membrane 39 to move and unfolds between the support ring 35 and the swirl block 33, and the heavy dust and graphite particles slide onto the flexible membrane 39; when the air intake stops, the swirl block 33 stops moving at the same time, the magnet 41 and the sphere 44 lose the centrifugal force, the magnet 41 resets under the action of gravity and the magnetic force of the annular seat 38, re-contacts the annular seat 38, and pulls the sphere 44 to reset through the connecting rope 43; the magnet 41 pulls the bottom end of the flexible membrane 39 to move, and the second bent rod 42 abuts against the flexible membrane 39 to make it bend in the opposite direction, thereby shaking off the heavy dust and graphite particles.

[0053] Through the above-mentioned structural design, heavy dust and graphite particles can be pre-separated from the exhaust gas flow and stored on the flexible membrane 39; when the air intake is stopped, they are shaken off and discharged into the inner shell 12 along the filter cover 17; the separated dust and particulate matter are effectively prevented from falling directly from the higher point of the swirl block 33 and re-mixing into the airflow over a long path, while reducing the residence time of large-sized dust and graphite particles in the filter cover 17, further reducing the risk of clogging of the filter cover 17.

[0054] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0055] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. Multi-stage purification device for sulfur-free expandable graphite waste gas purification, It is characterized in that include: A cooling and dust removal tank (1), a first spray purification tank (2), a second spray purification tank (3) and an exhaust gas detection box (4) are arranged in sequence. The cooling and dust removal tank (1) is used to cool and remove dust from sulfur-free expandable graphite purified exhaust gas; the first spray purification tank (2) and the second spray purification tank (3) are used to spray a scrubbing liquid on the exhaust gas to remove harmful substances in the exhaust gas; the exhaust gas detection box (4) is used to detect the concentration of harmful substances in the exhaust gas, and two exhaust outlet ends of the exhaust gas detection box (4) are respectively connected to an exhaust pipe and an air inlet pipeline of the spray purification tank.

2. The multi-stage purification device for sulfur-free expandable graphite waste gas purification according to claim 1, It is characterized in that It also includes an exhaust gas purification pipeline (5) and an exhaust gas circulation pipeline (6); the exhaust gas purification pipeline (5) is connected to the air outlet of the cooling and dust removal tank (1) and the air inlet of the first spray purification tank (2), the air outlet of the first spray purification tank (2) and the air inlet of the second spray purification tank (3), the air outlet of the second spray purification tank (3) and the air inlet of the exhaust gas detection box (4), the first air outlet of the exhaust gas detection box (4) and the exhaust pipe; the exhaust gas circulation pipeline (6) is connected to the second air outlet of the exhaust gas detection box (4) and the air inlet of the first spray purification tank (2), the second air outlet of the exhaust gas detection box (4) and the air inlet of the second spray purification tank (3).

3. The multi-stage purification device for sulfur-free expandable graphite waste gas purification according to claim 2, It is characterized in that A first electrically controlled valve (7) is provided on the exhaust gas detection box (4), a second electrically controlled valve (8) is provided on the exhaust gas circulation pipeline (6), and the first electrically controlled valve (7), the second electrically controlled valve (8) and the exhaust gas detection box (4) are all electrically connected to the controller.

4. The multi-stage purification device for sulfur-free expandable graphite waste gas purification according to claim 3, It is characterized in that The controller controls the on / off state of the first electrically controlled valve (7) and the second electrically controlled valve (8) according to the detection result of the exhaust gas detection box (4), specifically: When the concentration of harmful substances in the exhaust gas detection box (4) is less than a first preset concentration value, the first gas outlet of the first electrically controlled valve (7) is opened to allow the exhaust gas to be discharged through the exhaust pipe; When the concentration of harmful substances in the exhaust gas detection box (4) is greater than a first preset concentration value, the second gas outlet of the first electrically controlled valve (7) is opened to allow the exhaust gas to flow into the exhaust gas circulation pipeline (6); When the concentration of harmful substances in the exhaust gas detection box (4) is greater than a second preset concentration value, the first air outlet of the second electrically controlled valve (7) is opened to allow the exhaust gas to flow into the air inlet of the first spray purification tank (2); When the concentration of harmful substances in the exhaust gas detection box (4) is greater than a first preset concentration value and less than a second preset concentration value, the second gas outlet of the second electrically controlled valve (7) is opened to allow the exhaust gas to flow into the gas inlet of the second spray purification tank (3).

5. The multi-stage purification device for sulfur-free expandable graphite waste gas purification according to claim 1, It is characterized in that The cooling and dust removal tank (1) comprises: An outer shell (11) and an inner shell (12), the outer shell (11) and the inner shell (12) being arranged concentrically, an exhaust gas flow channel being formed between the outer shell (11) and the inner shell (12), the top end of the inner shell (12) extending out of the outer shell (11), the top end of the inner shell (12) being provided with an exhaust gas inlet (13), the bottom end of the outer shell (11) being provided with an exhaust gas outlet (14), and the side wall of the inner shell (12) being provided with a through hole communicating with the outer shell (11); A lower cooling jacket (15) and an upper cooling jacket (16), wherein the lower cooling jacket (15) is sleeved on the outside of the outer shell (11), and the upper cooling jacket (16) is sleeved on the outside of the inner shell (12), and a cooling liquid pipe is arranged around the lower cooling jacket (15) and the upper cooling jacket (16), and the cooling liquid pipe is connected to a cooling liquid supply device; A filter cover (17) is arranged in the exhaust gas flow channel, and the inner and outer edges of the filter cover (17) are respectively connected to the inner shell (12) and the outer shell (11), and filter holes are evenly arranged on the filter cover (17).

6. The multi-stage purification device for purifying waste gas with sulfur-free expandable graphite according to claim 5, It is characterized in that A guide column (18) is arranged at the upper part of the inner shell (12). The guide column (18) is concentrically arranged in the inner shell (12). The guide column (18) comprises an upper cylindrical section and a lower conical section. A conical surface is arranged at the top edge of the cylindrical section. The bottom end of the conical surface of the conical section corresponds to the lower edge of the through hole.

7. The multi-stage purification device for sulfur-free expandable graphite waste gas purification according to claim 5, It is characterized in that An exhaust gas slow flow plate (19) is arranged inside the outer shell (11), and the inner and outer edges of the exhaust gas slow flow plate (19) are respectively connected to the inner shell (12) and the outer shell (11), and the exhaust gas slow flow plate (19) is arranged in a spiral shape, and the bottom outlet end of the exhaust gas slow flow plate (19) faces the exhaust gas outlet port (14).

8. The multi-stage purification device for purifying waste gas with sulfur-free expandable graphite according to claim 7, It is characterized in that A plurality of inner baffles (21) and outer baffles (22) are arranged on the upper surface of the exhaust gas slow flow plate (19); the inner baffles (21) are connected to the inner side of the exhaust gas slow flow plate (19) and to the inner shell (12); the outer baffles (22) are connected to the outer side of the exhaust gas slow flow plate (19) and to the outer shell (11); the inner baffles (21) and the outer baffles (22) are arranged in a staggered manner.

9. The multi-stage purification device for sulfur-free expandable graphite waste gas purification according to claim 6, It is characterized in that The cooling and dust removal tank (1) further comprises an ash discharge unit, which comprises: A blocking ring (23), the blocking ring (23) being slidably connected to the outer wall of the inner shell (12), the top end of the blocking ring (23) being connected to the inner edge of the filter cover (17), the filter cover (17) being arranged in a conical shape and the inner edge being lower than the outer edge, and the inner edge of the filter cover (17) being lower than the lower edge of the through hole; An ash discharge hole (24), the ash discharge hole (24) being arranged through the inner shell (12), the ash discharge hole (24) being lower than the filter cover (17) and being blocked by the inner side of the blocking ring (23); A counterweight ring (25) is slidably connected to the inner wall of the inner shell (12); the counterweight ring (25) is connected to the blocking ring (23) via a first pull rope (26); and the first pull rope (26) passes through the ash discharge hole (25).

10. The multi-stage purification device for purifying waste gas with sulfur-free expandable graphite according to claim 9, It is characterized in that The ash removal unit also includes: A plug (27), the plug (27) is slidably connected to the inner wall of the inner shell (12) and is located below the counterweight ring (25); A tension spring (28) is connected to the bottom end of the guide column (18), and the tension spring (27) is connected to the plug (27) via a second pull rope (28).

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