Quartz sand carbon removal rotary kiln
By designing a quartz sand carbon removal rotary kiln and using high-temperature flue gas to oxidize carbonaceous impurities, the complex and cost-effective pickling method is solved, and simple, low-cost and efficient production of carbon removal is achieved.
Patent Information
- Application Number
- CN202420639208.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-29
- Publication Date
- 2025-03-11
- Estimated Expiration
- 2034-03-29
AI Technical Summary
In the existing quartz sand carbon removal process, the pickling method has problems such as complex processing, high cost and high requirements for operators, and a new type of carbon removal equipment is urgently needed to solve these problems.
A quartz sand carbon removal rotary kiln was designed. By setting up a rotary kiln cylinder, a slip pipe and a combustion chamber, high-temperature flue gas oxidizes carbon impurities to achieve the purpose of carbon removal.
The equipment directly heats quartz sand through high-temperature flue gas. Carbonite impurities are oxidized into carbon dioxide at high temperatures to achieve the purpose of carbon removal. The ultimate waste is carbon dioxide, which can be directly discharged without subsequent treatment. It is simple to remove carbon, low cost, and has high production efficiency, high thermal efficiency and energy saving.
Smart Images
Figure CN222598419U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of thermal equipment, in particular to a quartz sand carbon removal rotary kiln. Background Art
[0002] Quartz sand plays a vital role in aviation, aerospace, electronics, machinery and IT industries due to its unique physical and chemical properties. Its inherent molecular chain structure, crystal shape and lattice change law give it high temperature resistance, small thermal expansion coefficient, high insulation, corrosion resistance, piezoelectric effect, resonance effect and excellent optical properties, making it play an increasingly critical role in many high-tech products.
[0003] However, there are often problems with carbonaceous impurities in the production process of quartz sand. These impurities will reduce the performance of quartz sand, such as refractory, wear resistance and chemical stability, making it unable to meet the needs of certain specific applications. To solve this problem, the widely used quartz sand decarbonization process is the acid washing method. However, the acid washing method has problems such as complex handling, high cost and high requirements for operators. It is necessary to control the amount of acid used and properly dispose of waste acid to prevent environmental pollution and ensure the safety and stability of operation.
[0004] Therefore, there is an urgent need for a new type of quartz sand carbon removal equipment to solve the problems existing in the pickling method, such as complex processing, high cost and high requirements for operators. Utility Model Content
[0005] To this end, the utility model provides a quartz sand decarbonization rotary kiln, which is used to solve the quartz sand decarbonization problem and avoid the above-mentioned problems existing in the acid washing method.
[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:
[0007] A quartz sand decarbonization rotary kiln comprises a base, a chute and a combustion chamber; a rotary kiln cylinder is rotatably provided on the top surface of the base; a feed cover is provided on one side of the rotary kiln cylinder, and a discharge cover is provided on the other side for sealing the rotary kiln cylinder; the bottom end of the chute passes through the feed cover and extends into the rotary kiln cylinder for inputting quartz sand to be decarbonized into the rotary kiln cylinder; a gas nozzle is provided at one end of the combustion chamber for spraying combustible gas into the combustion chamber, and the other end is connected with the rotary kiln cylinder through the discharge cover via a flue gas duct; the gas nozzle is provided with a first gas pipeline for inhaling air from the first gas pipeline when the gas nozzle sprays combustible gas; the feed cover is provided with an exhaust port; a discharge port is provided at the bottom of the discharge cover; and a rotation drive device is also included for driving the rotary kiln cylinder to rotate.
[0008] Preferably, the inner wall of the rotary kiln cylinder is cast with silicon dioxide casting material.
[0009] Preferably, it also includes a gas main pipe for inputting air; the first gas pipeline is connected to the gas main pipe at one end away from the gas nozzle.
[0010] Preferably, it also includes a second gas pipeline; one end of the second gas pipeline is connected to the combustion chamber, and the other end is connected to the gas main pipe; the second gas pipeline is provided with a butterfly valve.
[0011] Preferably, the flue gas duct is provided with an air mixing device for injecting low-temperature air into the flue gas duct to adjust the flue gas temperature in the flue gas duct.
[0012] Optionally, the air mixing device includes an air mixing cylinder arranged in the flue gas duct; the air mixing cylinder is in a truncated cone shape; the top diameter of the air mixing cylinder is adapted to the diameter of the flue gas duct; the bottom of the air mixing cylinder is provided with an air mixing pipe connected to the interior thereof; the air mixing pipe is provided with a blower for blowing low-temperature air into the flue gas duct.
[0013] Preferably, it also includes a bracket; the top surface of the bracket is provided with a first adjusting arm and a second adjusting arm; the top of the first adjusting arm is threadedly connected with a height adjustment bolt; the end of the height adjustment bolt away from the first adjusting arm is threadedly connected to the bottom surface of the base facing the feed cover; the top of the second adjusting arm is hinged to the base facing the discharge cover.
[0014] The utility model has at least the following beneficial effects:
[0015] The rotary kiln cylinder is provided with a rotary kiln body, a chute and a combustion chamber. A feed cover is provided on one side of the rotary kiln cylinder, and a discharge cover is provided on the other side. The bottom end of the chute passes through the feed cover and extends into the rotary kiln cylinder. A gas nozzle is provided at one end of the combustion chamber for spraying combustible gas into the combustion chamber, and the other end is connected with the rotary kiln cylinder through a flue gas pipeline via the discharge cover. The gas nozzle is provided with a first gas pipeline for inhaling air from the first gas pipeline when the gas nozzle sprays the combustible gas. The feed cover is provided with an exhaust port, and a discharge port is provided at the bottom of the discharge cover. During decarbonization, the quartz sand to be decarbonized slides into the rotary kiln cylinder from the chute, and the combustible gas is sprayed into the combustion chamber by the gas nozzle for combustion. The high-temperature flue gas generated by the combustion enters the rotary kiln cylinder through the flue gas pipeline. The quartz sand to be decarbonized in the rotary kiln cylinder is oxidized into carbon dioxide under the combined action of high temperature and oxygen in the flue gas, and is discharged from the exhaust port of the feed cover together with the high-temperature flue gas. The decarbonized quartz sand slides down under the rotation of the rotary kiln cylinder and is discharged from the discharge port.
[0016] It can be seen that the utility model of a quartz sand decarbonization rotary kiln directly heats the quartz sand through high-temperature flue gas, and the carbonaceous impurities are oxidized into carbon dioxide at high temperature, thereby achieving the purpose of decarbonization. The ultimate waste produced by its decarbonization is carbon dioxide, which can be directly discharged without subsequent treatment, and the decarbonization is simple and low in cost; at the same time, the use of the rotary kiln for direct heating and decarbonization can not only achieve continuous production with high production efficiency, but also high thermal efficiency and more energy saving; finally, the inner wall of the rotary kiln cylinder is cast with silicon dioxide casting material, which prevents secondary pollution caused by other substances in the cylinder penetrating into the quartz sand at high temperature. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly explain the prior art and the present invention, the following briefly introduces the drawings required for describing the prior art and the present invention. Obviously, the drawings described below are only exemplary, and for ordinary technicians in this field, other drawings can be derived from the provided drawings without creative work.
[0018] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them. They are not used to limit the conditions under which the present invention can be implemented. Any structural modification, change in proportion or adjustment of size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.
[0019] Figure 1 This is a front cross-sectional view of a quartz sand decarbonization rotary kiln of the utility model;
[0020] Figure 2 This is an accessory of a quartz sand decarbonization rotary kiln. Figure 1 A partial enlarged view of part A;
[0021] Figure 3 This is an accessory of a quartz sand decarbonization rotary kiln. Figure 1 A partial enlarged view of part B;
[0022] Description of reference numerals:
[0023] 1. Bracket; 2. Base; 3. Rotary kiln cylinder; 4. Feed cover; 5. Discharge cover; 6. Exhaust port; 7. Discharge port; 8. Chute; 9. First adjusting arm; 10. Second adjusting arm; 11. Driving motor; 12. Gear ring; 13. Roller; 14. Flue gas duct; 15. Combustion chamber; 16. Gas nozzle; 17. First gas duct; 18. Second gas duct; 19. Gas main; 20. Butterfly valve; 21. Air mixing device; 2101. Air mixing tube; 2102. Mixing pipe; 22. Heightening bolt; 23. Support wheel. DETAILED DESCRIPTION
[0024] The present application is further described below in detail through specific embodiments in conjunction with the accompanying drawings.
[0025] In the description of this application: unless otherwise specified, the meaning of "plurality" is two or more. The terms "first", "second", "third", etc. in this application are intended to distinguish the objects referred to, and do not have special meanings in terms of technical connotations (for example, they should not be understood as emphasizing the importance or order, etc.). Expressions such as "including", "comprising", "having", etc. also mean "not limited to" (certain units, components, materials, steps, etc.).
[0026] The terms such as "upper", "lower", "left", "right", "middle", etc. used in this application are usually used to facilitate intuitive understanding by comparing with the accompanying drawings, and are not absolute limitations on the positional relationship in the actual product. Without departing from the technical concept disclosed in this application, changes in these relative positional relationships should also be regarded as the scope of this application.
[0027] The utility model discloses a quartz sand decarbonizing rotary kiln, such as Figures 1 to 3As shown, a base 2, a chute 8 and a combustion chamber 15 are provided. The top surface of the base 2 is rotatably provided with a rotary kiln barrel 3. Specifically, a rotary connection structure commonly used in rotary kilns in the prior art can be adopted, that is, a rolling ring 13 is sleeved on the outer wall of the rotary kiln barrel 3, and a pair of supporting wheels 23 are rotatably provided on the top surface of the base 2. The pair of supporting wheels 23 support the rolling ring 13, and the rolling ring 13 can roll on the supporting wheels 23. A feed cover 4 is provided on one side of the rotary kiln barrel 3, and a discharge cover 5 is provided on the other side to seal the rotary kiln barrel 3. The specific structures of the feed cover 4 and the discharge cover 5, and the sealing method with the rotary kiln barrel 3 are all prior arts well known to those skilled in the art, and will not be repeated here. The bottom end of the chute 8 passes through the feed cover 4 and extends into the rotary kiln barrel 3, and the quartz sand to be decarbonized is fed into the rotary kiln barrel 3 through the chute 8. A gas nozzle 16 is provided at one end of the combustion chamber 15 for spraying combustible gas into the combustion chamber 15. The other end is connected to the rotary kiln cylinder 3 through the flue gas duct 14 via the discharge hood 5. The gas nozzle 16 is provided with a first gas duct 17. The gas nozzle 16 is similar to a venturi tube. When the gas nozzle 16 sprays combustible gas, air is sucked from the first gas duct 17, so that the combustible gas is fully burned in the combustion chamber. The feed hood 4 is provided with an exhaust port 6, which is preferably arranged at the top of the feed hood 4 to discharge the flue gas from the combustion chamber. The discharge hood 5 is provided with a discharge port 7 at the bottom for discharging. The decarbonized quartz sand is discharged from the discharge port 7. The rotary kiln body 3 is also provided with a rotation driving device, which is used to drive the rotary kiln body 3 to rotate. The driving device also adopts a driving structure commonly used in rotary kilns in the prior art, that is, a driving motor 11 is arranged on the base 2, a gear ring 12 is sleeved on the outer wall of the rotary kiln body 3, and a driving gear is arranged on the output shaft of the driving motor 11. The driving gear is meshed with the gear ring 12, and the driving gear ring 12 rotates, thereby driving the rotary kiln body 3 to rotate.
[0028] Preferably, during carbon removal, the temperature in the kiln reaches about 800°C. To prevent the precipitation of the rotary kiln barrel 3 material from contaminating the quartz sand, a silica casting material is poured on the inner wall of the rotary kiln barrel 3. Specifically, a high-purity silica casting material can be used for pouring.
[0029] Preferably, in order to facilitate the transportation of air, a gas main pipe 19 is further provided for transporting air. The end of the first gas pipeline 17 away from the gas nozzle 16 is connected to the gas main pipe 19 .
[0030] Preferably, in order to further adjust the oxygen content in the combustion chamber 15 so that the combustible gas is completely burned and a certain amount of oxygen is contained in the flue gas, in this way, the flue gas entering the rotary kiln cylinder 3 not only heats the quartz sand to be decarbonized, but the oxygen also promotes the combustion of residual carbon in the quartz sand to be decarbonized, which is beneficial to decarbonization. A second gas pipeline 18 is also provided, one end of the second gas pipeline 18 is connected to the combustion chamber 15, and the other end is connected to the gas main 19. The second gas pipeline 18 is provided with a butterfly valve 20, and the air intake is controlled by the butterfly valve 20.
[0031] Preferably, during carbon removal, the temperature in the kiln is generally required to be around 800°C, while the temperature of the flue gas burning in the combustion chamber 15 will be relatively high. In order to adjust the flue gas temperature, an air mixing device 21 is provided on the flue gas duct 14. Low-temperature air is injected into the flue gas duct 14 through the air mixing device 21 to adjust the flue gas temperature in the flue gas duct 14 to meet the process temperature requirements.
[0032] Optionally, the embodiment of the present application provides a preferred implementation of the air mixing device 21, specifically: the air mixing device 21 includes an air mixing tube 2101 arranged in the flue gas duct 14, the air mixing tube 2101 is in a truncated cone shape, the top diameter of the air mixing tube 2101 is adapted to the diameter of the flue gas duct 14, and the bottom of the air mixing tube 2101 is provided with an air mixing tube 2102 connected to the interior thereof. This structural design, when low-temperature air enters, is consistent with the flow direction of the flue gas and will not interfere with the flow direction of the flue gas. A blower is provided on the air mixing tube 2102, and low-temperature air is blown into the flue gas duct 14 by the blower. The flow rate of the blown low-temperature air can be adjusted by adjusting the speed of the blower, and a flow regulating valve can also be installed on the air mixing tube 2102 to control the amount of low-temperature air entering.
[0033] Preferably, for continuous production and improved production efficiency, the rotary kiln barrel 3 can be tilted, the feed end of the chute 8 is high, and the discharge end of the discharge port 7 is low. In this way, during the rotation of the rotary kiln barrel 3, not only the quartz sand is rolled, which is beneficial to the decarbonization of the quartz sand, but also the quartz sand will automatically slide from the feed side to the discharge side and discharge from the discharge port 7 to achieve continuous production. For this purpose, a bracket 1 is also provided, and the top surface of the bracket 1 is provided with a first adjustment arm 9 and a second adjustment arm 10. The top of the first adjustment arm 9 is threadedly connected with a height adjustment bolt 22. The end of the height adjustment bolt 22 away from the first adjustment arm 9 is threadedly connected to the bottom surface of the base 2 on the side of the feed cover 4, and the top of the second adjustment arm 10 is hinged with the base 2 on the side of the discharge cover 5. Rotate the height adjustment bolt 22, and under the action of the thread, lift the base 2 on the side of the feed cover 4 to tilt the rotary kiln barrel 3. Usually, in actual application, a rotating wrench is provided on the height adjustment bolt 22 to facilitate the rotation of the height adjustment bolt 22.
[0034] The working principle of the rotary kiln of the present application is as follows: the quartz sand to be decarbonized slides into the rotary kiln barrel 3 from the chute 8 in sequence, and the combustible gas is sprayed into the combustion chamber 15 by the gas nozzle 16. When the combustible gas flows through the gas nozzle 16 at a high speed, negative pressure is generated, and air is sucked in from the first gas pipe 17 and sprayed into the combustion chamber 15 together with the combustible gas. The combustible gas burns in the combustion chamber 15, and the generated high-temperature flue gas enters the rotary kiln barrel 3 from the flue gas pipe 14. The flue gas temperature is controlled at 800°C (this can be controlled by the air mixing device 21). The carbonaceous impurities in the quartz sand to be decarbonized in the rotary kiln barrel 3 are oxidized into carbon dioxide under the action of high temperature and oxygen in the flue gas, and then discharged from the exhaust port 6 of the feed hood 4 together with the high-temperature flue gas. The decarbonized quartz sand slides down during the rotation of the rotary kiln barrel 3, and then discharged from the discharge port 7.
[0035] The above is a relatively specific and detailed description of the present application through general description and specific embodiments. It should be understood that, based on the technical concept of the present application, several conventional adjustments or further innovations can be made to these specific embodiments; however, as long as they do not deviate from the technical concept of the present application, the technical solutions obtained by these conventional adjustments or further innovations also fall within the scope of protection of the claims of the present application.
Claims
1. A quartz sand decarbonization rotary kiln, characterized in that: The rotary kiln comprises a base (2), a chute (8) and a combustion chamber (15); a rotary kiln body (3) is rotatably provided on the top surface of the base (2); a feed cover (4) is provided on one side of the rotary kiln body (3), and a discharge cover (5) is provided on the other side, for sealing the rotary kiln body (3); the bottom end of the chute (8) passes through the feed cover (4) and extends into the rotary kiln body (3), for inputting quartz sand to be decarbonized into the rotary kiln body (3); a gas nozzle (16) is provided at one end of the combustion chamber (15), for The combustion chamber (15) is provided with a combustible gas, and the other end is connected to the rotary kiln cylinder (3) through the flue gas pipe (14) and the discharge hood (5); the gas nozzle (16) is provided with a first gas pipe (17) for sucking air from the first gas pipe (17) when the gas nozzle (16) sprays the combustible gas; the feed hood (4) is provided with an exhaust port (6); the discharge hood (5) is provided with a discharge port (7) at the bottom; and a rotation drive device is also provided for driving the rotary kiln cylinder (3) to rotate.
2. A quartz sand decarbonization rotary kiln according to claim 1, characterized in that: The inner wall of the rotary kiln cylinder (3) is cast with silicon dioxide casting material.
3. A quartz sand decarbonization rotary kiln according to claim 1, characterized in that: It also includes a gas main pipe (19) for inputting air; the first gas pipeline (17) is connected to the gas main pipe (19) at one end away from the gas nozzle (16).
4. A quartz sand decarbonization rotary kiln according to claim 3, characterized in that: It also includes a second gas pipeline (18); one end of the second gas pipeline (18) is connected to the combustion chamber (15), and the other end is connected to the gas main pipe (19); the second gas pipeline (18) is provided with a butterfly valve (20).
5. A quartz sand decarbonization rotary kiln according to claim 1, characterized in that: The flue gas duct (14) is provided with an air mixing device (21) for injecting low-temperature air into the flue gas duct (14) to adjust the temperature of the flue gas in the flue gas duct (14).
6. A quartz sand decarbonization rotary kiln according to claim 5, characterized in that: The air mixing device (21) comprises an air mixing cylinder (2101) arranged in the flue gas duct (14); the air mixing cylinder (2101) is in a truncated cone shape; the top diameter of the air mixing cylinder (2101) is adapted to the diameter of the flue gas duct (14); the bottom of the air mixing cylinder (2101) is provided with an air mixing pipe (2102) connected to the interior of the air mixing cylinder (2101); and a blower is provided on the air mixing pipe (2102) for blowing low-temperature air into the flue gas duct (14).
7. A quartz sand decarbonization rotary kiln according to any one of claims 1 to 6, characterized in that: It also comprises a bracket (1); a first adjusting arm (9) and a second adjusting arm (10) are provided on the top surface of the bracket (1); a height adjustment bolt (22) is threadedly connected to the top of the first adjusting arm (9); the height adjustment bolt (22) is threadedly connected to the bottom surface of the base (2) facing the feed cover (4) at one end away from the first adjusting arm (9); and the top of the second adjusting arm (10) is hingedly connected to the base (2) facing the discharge cover (5).