Quartz sand carbon removal rotary kiln with material recovery function
By setting up material recycling drums and recycling pipes in the quartz sand carbon removal rotary kiln, the problem of high-temperature flue gas bringing out quartz sand dust is solved, dust recycling and flue gas cleaning are achieved, and raw material waste and energy consumption are reduced.
Patent Information
- Application Number
- CN202421638139.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-11
- Publication Date
- 2025-04-25
- Estimated Expiration
- 2034-07-11
AI Technical Summary
In the prior art, high-temperature flue gas will bring out quartz sand when discharged from the feed cover, resulting in dust pollution, increasing raw material waste and increasing costs.
A quartz sand carbon removal rotary kiln with material recycling function was designed. By setting up a material recovery drum above the hopper, and using high-temperature flue gas to enter the material recovery drum through the first flue gas pipeline. As the volume of the material recovery drum increases, the high-temperature flue gas relieves pressure, the quartz sand dust brought out falls, and falls into the slip pipe and is recycled.
It effectively reduces dust pollution, saves raw materials, improves the cleanliness of flue gas, and reduces energy consumption.
Smart Images
Figure CN222799582U_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 with a material recovery function. 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] To this end, a new solution has emerged, namely, a decarbonization rotary kiln that injects combustible gas into the rotary kiln cylinder. Specifically, a gas nozzle and a combustion chamber are provided on the discharge hood of the rotary kiln, and an exhaust port is provided on the feed hood. The combustible gas is injected into the combustion chamber by the gas nozzle for combustion, and the high-temperature flue gas generated by the combustion enters the rotary kiln cylinder. Under the combined effect of high temperature and oxygen in the flue gas, the quartz sand to be decarbonized is oxidized into carbon dioxide, which is discharged from the exhaust port of the feed hood along with the high-temperature flue gas.
[0005] Although this decarbonization rotary kiln effectively solves the problems of complex processing, high cost and high requirements for operators in the pickling method, it is found in actual applications that high-temperature flue gas will carry out quartz sand when discharged from the feed hood, causing dust pollution, increasing raw material waste and raising costs. Utility Model Content
[0006] To this end, the utility model provides a quartz sand decarbonization rotary kiln with a material recovery function, which is used to solve the technical problem that the high-temperature flue gas in the decarbonization rotary kiln of the prior art, which injects combustible gas into the rotary kiln cylinder, will bring out the quartz sand when it is discharged from the feed hood, causing dust pollution, increasing raw material waste and increasing costs.
[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:
[0008] A quartz sand decarbonization rotary kiln with material recovery function comprises a base and a chute; 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; a hopper is provided above the feed cover; one end of the chute is communicated with the bottom of the hopper, and the other end passes through the feed cover and extends into the rotary kiln cylinder for conveying quartz sand to be decarbonized into the rotary kiln cylinder; a discharge port is provided at the bottom of the discharge cover; a gas burner is provided in communication with the discharge cover; a rotation drive device is also provided for driving the rotary kiln cylinder to rotate; a material recovery cylinder is provided above the hopper; a second flue gas duct is provided on the top of the material recovery cylinder for communication with the second flue gas duct; the bottom of the material recovery cylinder is communicated with the feed cover through a first flue gas duct; a recovery chute is provided at the bottom of the material recovery cylinder for communication with the first flue gas duct; the recovery chute is communicated with the chute at one end away from the material recovery cylinder; and the recovery chute is communicated with the chute at one end.
[0009] Preferably, the second flue gas duct is provided with a fan.
[0010] Preferably, a conical recovery bucket is provided at the bottom end of the material recovery cylinder; and the recovery chute is connected to the bottom of the recovery bucket.
[0011] Preferably, the first flue gas duct is connected to the material recovery cylinder near the recovery hopper area.
[0012] Preferably, the inner wall of the rotary kiln cylinder is cast with silicon dioxide casting material.
[0013] Preferably, the gas burner is a hydrogen burner.
[0014] Preferably, the gas burner body is provided with a secondary air duct and a primary air duct in communication with the gas burner body in sequence in a direction away from the discharge hood.
[0015] Optionally, it also includes a first adjusting arm and a second adjusting arm; the top surface of the first adjusting arm is rotatably provided with an adjusting seat; the top surface of the adjusting seat is fixedly provided with a height adjustment bolt; the height adjustment bolt is threadedly connected to the bottom surface of the base facing the feed cover at one end away from the adjusting seat; the top of the second adjusting arm is hinged to the base facing the discharge cover.
[0016] Preferably, handles are provided on both the left and right sides of the adjustment seat.
[0017] The utility model has at least the following beneficial effects:
[0018] A material recovery cylinder is arranged above the hopper, a second flue gas pipe connected to the material recovery cylinder is arranged on the top of the material recovery cylinder, the bottom of the material recovery cylinder is connected to the feed cover through the first flue gas pipe, a recovery chute connected to the material recovery cylinder is arranged at the bottom of the material recovery cylinder, and the recovery chute is connected to the chute at one end away from the material recovery cylinder. In this way, the high-temperature flame generated by the combustion of the gas burner is ejected into the rotary kiln cylinder at high speed, the high-temperature flue gas reacts with the quartz sand in the rotary kiln cylinder, and the carbonaceous impurities are oxidized into carbon dioxide at high temperature. Subsequently, the high-temperature flue gas enters the material recovery cylinder through the first flue gas pipe. As the volume of the material recovery cylinder increases, the high-temperature flue gas is depressurized, so that the quartz sand dust brought out by it falls down and falls into the chute through the recovery chute to be recovered, thereby reducing dust pollution and saving raw materials.
[0019] At the same time, the utility model of a quartz sand decarbonization rotary kiln with material recovery function adopts a hydrogen burner, and hydrogen is burned to produce H 2 O, the flue gas is pollution-free, which greatly improves the cleanliness of the flue gas, does not cause secondary pollution to the materials, and is also conducive to the recycling of materials directly falling into the chute from the recovery chute. The flue gas is directly injected into the rotary kiln cylinder to directly heat the materials, with high thermal efficiency and reduced energy consumption. The flame temperature is high when hydrogen burns, which increases the temperature inside the rotary kiln cylinder, so that the temperature inside the entire rotary kiln can be controlled above 1000℃.
[0020] In addition, the hydrogen burner of the quartz sand decarbonization rotary kiln with material recovery function of the utility model adopts a graded combustion setting of primary air duct and secondary air duct, which not only helps the hydrogen to burn more fully, but also can adjust the flame length and improve the temperature uniformity in the kiln. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] 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.
[0022] 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.
[0023] Figure 1 This is a front cross-sectional view of a quartz sand decarbonization rotary kiln with a material recovery function according to the utility model;
[0024] Figure 2 This is an accessory of a quartz sand decarbonization rotary kiln with material recovery function. Figure 1 A partial enlarged view of part A;
[0025] Figure 3 This is an accessory of a quartz sand decarbonization rotary kiln with material recovery function. Figure 1 A partial enlarged view of part B;
[0026] Description of reference numerals:
[0027] 1. Base; 2. Rotary kiln cylinder; 3. Feed cover; 4. Discharge cover; 5. Discharge port; 6. Hopper; 7. Chute; 8. Gas burner; 9. Roller; 10. Support wheel; 11. Gear ring; 12. Drive motor; 13. First adjustment arm; 14. Second adjustment arm; 15. Stop wheel; 16. Height adjustment bolt; 17. Adjustment seat; 18. Handle; 19. Material recovery cylinder; 20. Recovery chute; 21. Recovery hopper; 22. Fan; 23. First flue gas duct; 24. Second flue gas duct; 25. Primary air duct; 26. Secondary air duct. DETAILED DESCRIPTION
[0028] The present application is further described below in detail through specific embodiments in conjunction with the accompanying drawings.
[0029] 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.).
[0030] 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.
[0031] The utility model discloses a quartz sand decarbonizing rotary kiln with material recovery function, such as Figures 1 to 3As shown, a base 1 and a slide pipe 7 are provided, and a rotary kiln cylinder 2 is rotatably provided on the top surface of the base 1. Specifically, a rotary connection structure commonly used in rotary kilns in the prior art can be adopted, that is, rollers 9 are sleeved on the left and right sides of the outer wall of the rotary kiln cylinder 2, and a pair of supporting wheels 10 are rotatably provided on the top surface of the base 1. The pair of supporting wheels 10 respectively support the rollers 9 on the left and right sides, and the rollers 9 can roll on the supporting wheels 10. In order to prevent the rotary kiln cylinder 2 from thermal expansion and contraction or displacement when tilted, stop wheels 15 are usually rotatably provided on the top surface of the base 1 on the left and right sides of the supporting wheel 10 facing the feed cover 3. The roller 9 is located in the middle of the stop wheel 15 to limit the roller 9. The setting of the stop wheel 15 is also a prior art well known to those skilled in the art, and will not be repeated here. A feed cover 3 is provided on one side of the rotary kiln cylinder 2, and a discharge cover 4 is provided on the other side, which are used to seal the rotary kiln cylinder 2. The specific structures of the feed cover 3 and the discharge cover 4, and the sealing method with the rotary kiln cylinder 2 are all prior art well known to those skilled in the art, and will not be described in detail here. A hopper 6 is provided above the feed cover 3, and one end of the chute 7 is connected to the bottom of the hopper 6, and the other end passes through the feed cover 3 and extends into the rotary kiln cylinder 2. The quartz sand to be decarbonized is fed into the rotary kiln cylinder 2 through the chute 7. A discharge port 5 is provided at the bottom of the discharge cover 4 for discharging, and the decarbonized quartz sand is discharged from the discharge port 5. The discharge cover 4 is provided with a gas burner 8 connected thereto, and the gas burner is a prior art product well known to those skilled in the art, and its structure and principle will not be described in detail here. The high-temperature flue gas generated by the combustion of the gas burner 8 is ejected into the rotary kiln barrel 2. The carbonaceous impurities in the quartz sand to be decarbonized in the rotary kiln barrel 2 are oxidized into carbon dioxide under the action of high temperature and oxygen in the flue gas, thereby achieving carbon removal. A rotary drive device is also included to drive the rotary kiln barrel 2 to rotate. The drive device also adopts a common drive structure of the rotary kiln in the prior art, that is, a drive motor 12 is arranged on the base 1, and a gear ring 11 is sleeved on the outer wall of the rotary kiln barrel 2. The output shaft of the drive motor 12 is provided with a drive gear, and the drive gear is meshed with the gear ring 11. The drive gear ring 11 rotates, driving the rotary kiln barrel 2 to rotate. A material recovery cylinder 19 is provided above the hopper 6, and a second flue gas duct 24 connected thereto is provided on the top of the material recovery cylinder 19. The bottom of the material recovery cylinder 19 is connected to the feed hood 3 through the first flue gas duct 23. A recovery chute 20 connected thereto is provided at the bottom of the material recovery cylinder 19. The recovery chute 20 is connected to the chute 7 at one end away from the material recovery cylinder 19. In this way, the high-temperature flame generated by the combustion of the gas burner 8 is sprayed into the rotary kiln cylinder 2 at a high speed (up to 100m / s), and the high-temperature flue gas reacts with the quartz sand in the rotary kiln cylinder 2, and the carbonaceous impurities are oxidized into carbon dioxide at high temperature. Subsequently, the high-temperature flue gas enters the material recovery cylinder 19 through the first flue gas duct 23. As the volume of the material recovery cylinder 19 increases, the high-temperature flue gas is depressurized, thereby causing the quartz sand dust brought out by it to fall down and fall into the chute 7 through the recovery chute 20 to be recovered, thereby reducing dust pollution and saving raw materials.
[0032] Preferably, in order to ensure the normal circulation of the high-temperature flue gas in the rotary kiln of the present application, the second flue gas duct 24 is provided with a fan 22 .
[0033] Preferably, in order to allow the quartz sand dust separated in the material recovery cylinder 19 to smoothly fall into the chute 7 and be sent into the rotary kiln cylinder 2 again, a conical recovery bucket 21 is provided at the bottom of the material recovery cylinder 19, and the recovery chute 20 is connected to the bottom of the recovery bucket 21.
[0034] Preferably, in order to improve the separation speed and thoroughness of the quartz sand dust in the high-temperature flue gas, the first flue gas duct 23 is connected to the material recovery cylinder 19 near the recovery bucket 21 area.
[0035] Preferably, during carbon removal, the temperature in the kiln reaches above 800°C. To prevent the precipitation of materials from the rotary kiln cylinder 2 and contamination of the quartz sand, a silica casting material is poured on the inner wall of the rotary kiln cylinder 2. Specifically, a high-purity silica casting material can be used for pouring.
[0036] Preferably, in order to improve the cleanliness of the flue gas and the temperature in the rotary kiln cylinder 2, the gas burner 8 is a hydrogen burner, which is a prior art product well known to those skilled in the art and will not be described in detail here. Because a hydrogen burner is used, in order to ensure the same safety, a nitrogen purge and an online oxygen content detection device are generally provided to improve the overall safety, which is also a configuration well known to those skilled in the art and will not be described in detail here.
[0037] Preferably, the gas burner 8 body is provided with a secondary air duct 26 and a primary air duct 25 connected thereto in sequence in a direction away from the discharge hood 4. Air is injected through the primary air duct 25 to mix with the hydrogen and provide oxygen required for hydrogen combustion. The secondary air duct 26 injects air again to provide sufficient oxygen for the combustion of hydrogen, which helps to burn more fully. The temperature in the entire rotary kiln can be controlled above 1000°C; at the same time, oxygen is provided for the decarbonization of quartz sand; and the flame length can be adjusted to improve the temperature uniformity in the kiln.
[0038] Optionally, for a rotary kiln without a material moving device, the rotary kiln cylinder 2 is usually tilted on the base 1. The present application provides a preferred structure for the tilted setting, specifically: a first adjustment arm 13 and a second adjustment arm 14 are also provided. An adjustment seat 17 is rotatably provided on the top surface of the first adjustment arm 13, and a height adjustment bolt 16 is fixedly provided on the top surface of the adjustment seat 17, so that the end of the height adjustment bolt 16 away from the adjustment seat 17 is threadedly connected to the bottom surface of the base 1 facing the feed cover 3, and the top of the second adjustment arm 14 is hinged to the base 1 facing the discharge cover 4. In this way, by rotating the adjustment seat 17, the base 1 is lifted or lowered under the action of the thread of the height adjustment bolt 16, thereby realizing the tilting of the base 1, and then tilting the rotary kiln cylinder 2.
[0039] Preferably, in order to facilitate the rotation of the adjustment seat 17 , handles 18 are provided on the left and right sides of the adjustment seat 17 .
[0040] 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 cylinder 2 from the chute 7 in sequence, and the high-temperature flue gas generated by the combustion of the gas burner 8 is sprayed into the rotary kiln cylinder 2. The carbonaceous impurities in the quartz sand to be decarbonized in the rotary kiln cylinder 2 are oxidized into carbon dioxide under the combined action of high temperature and oxygen in the flue gas, thereby achieving carbon removal. The decarbonized quartz sand is discharged from the discharge port 5; then, the high-temperature flue gas enters the material recovery cylinder 19 from the feed hood 3 through the first flue gas pipe 23. Due to the increase in volume of the material recovery cylinder 19, the high-temperature flue gas is depressurized, thereby causing the quartz sand dust brought out by it to fall down and fall into the chute 7 through the recovery chute 20 to be recovered, thereby reducing dust pollution and saving raw materials.
[0041] 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 with a material recovery function, comprising a base (1) and a chute (7); a rotary kiln cylinder (2) is rotatably provided on the top surface of the base (1); a feed cover (3) is provided on one side of the rotary kiln cylinder (2), and a discharge cover (4) is provided on the other side, for sealing the rotary kiln cylinder (2); a hopper (6) is provided above the feed cover (3); one end of the chute (7) is connected to the bottom of the hopper (6), and the other end passes through the feed cover (3) and extends into the rotary kiln cylinder (2), for conveying quartz sand to be decarbonized into the rotary kiln cylinder (2); a discharge port (5) is provided at the bottom of the discharge cover (4); the discharge cover (4) is provided with a gas burner (8) connected thereto; and further comprising a rotation drive device for driving the rotary kiln cylinder (2) to rotate, characterized in that: A material recovery cylinder (19) is provided above the hopper (6); a second flue gas duct (24) is provided at the top of the material recovery cylinder (19) and is in communication with the material recovery cylinder; the bottom of the material recovery cylinder (19) is in communication with the feed hood (3) via a first flue gas duct (23); a recovery chute (20) is provided at the bottom end of the material recovery cylinder (19) and is in communication with the material recovery cylinder; an end of the recovery chute (20) away from the material recovery cylinder (19) is in communication with the chute (7).
2. The quartz sand decarbonization rotary kiln with material recovery function according to claim 1, characterized in that: The second flue gas duct (24) is provided with a fan (22).
3. The quartz sand decarbonization rotary kiln with material recovery function according to claim 1, characterized in that: A conical recovery bucket (21) is provided at the bottom end of the material recovery cylinder (19); the recovery chute (20) is in communication with the bottom of the recovery bucket (21).
4. The quartz sand decarbonization rotary kiln with material recovery function according to claim 3 is characterized in that: The first flue gas duct (23) is in communication with a region of the material recovery cylinder (19) close to the recovery hopper (21).
5. The quartz sand decarbonization rotary kiln with material recovery function according to claim 1, characterized in that: The inner wall of the rotary kiln cylinder (2) is cast with silicon dioxide casting material.
6. A quartz sand decarbonization rotary kiln with material recovery function according to claim 1 or 5, characterized in that: The gas burner (8) is a hydrogen burner.
7. The quartz sand decarbonization rotary kiln with material recovery function according to claim 6, characterized in that: The gas burner (8) body is provided with a secondary air duct (26) and a primary air duct (25) in sequence, communicating with the gas burner (8) body, in a direction away from the discharge hood (4).
8. The quartz sand decarbonizing rotary kiln with material recovery function according to claim 7, characterized in that: It also comprises a first adjusting arm (13) and a second adjusting arm (14); the top surface of the first adjusting arm (13) is rotatably provided with an adjusting seat (17); the top surface of the adjusting seat (17) is fixedly provided with a height adjustment bolt (16); the end of the height adjustment bolt (16) away from the adjusting seat (17) is threadedly connected to the bottom surface of the base (1) facing the feed cover (3); the top of the second adjusting arm (14) is hingedly connected to the base (1) facing the discharge cover (4).
9. The quartz sand decarbonizing rotary kiln with material recovery function according to claim 8, characterized in that: The adjustment seat (17) is provided with handles (18) on both the left and right sides.