A quartz sand drying system
By using a combination of a heat-conducting cylinder and a biomass hot air device in the quartz sand drying equipment, the problems of high cost and pollution in quartz sand drying have been solved, achieving a low-cost, pollution-free, and highly efficient drying effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 广西港桥新型建材有限公司
- Filing Date
- 2025-06-27
- Publication Date
- 2026-05-26
AI Technical Summary
Existing quartz sand drying equipment is expensive and causes serious pollution, and cannot effectively utilize biomass fuel as a heat source, resulting in the contamination of quartz sand.
A horizontal drum is used, with a heat-conducting cylinder and a biomass hot air device installed inside. The biomass hot air directly heats the heat-conducting cylinder, and the quartz sand is isolated from the high-temperature flue gas in the drying space. The flue gas is purified by the exhaust gas treatment device, which improves thermal efficiency and reduces pollution.
It achieves low-cost, pollution-free quartz sand drying, improves drying efficiency, reduces environmental pollution, and simplifies equipment structure.
Smart Images
Figure CN224285199U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of quartz sand processing technology, specifically to a quartz sand drying system. Background Technology
[0002] Currently, in the processing of quartz sand, quartz stone undergoes multiple stages of crushing to obtain primary quartz sand. This quartz sand then needs to be washed multiple times to remove mud, and then successively dried, color sorted, and screened before being packaged and stored. In the drying process, to ensure drying efficiency, rotary drum dryers are generally used. Rotary drum dryers typically feed the material and hot air directly into the drum, and the material is dried by the hot air as the drum rotates, as illustrated in patent CN02254415.1 - Rotary Drum Sludge Dryer. However, currently, drying quartz sand generally uses electrically heated hot air systems, primarily to avoid hot air contamination of the quartz sand. This results in very high production costs for the entire quartz sand drying process. Currently available drying equipment cannot use lower-cost biomass fuel as a heat source, primarily because the hot air from burning biomass contains dust and a large amount of unburned substances, such as tar, sulfur dioxide, and nitrogen oxides. If these substances directly contact damp silica sand, some will react with the sand, and others will adhere to its surface. While some manufacturers install filters at the hot air inlet of biomass boilers, this undoubtedly increases production costs. Furthermore, the presence of different biomass components in biomass fuel leads to poor combustion and a high level of pollutants in the flue gas, making filtration expensive. Therefore, the drying cost is not lower than that of electric heating. Thus, a low-cost drying device that does not contaminate the silica sand is needed to solve these problems. Utility Model Content
[0003] In order to overcome one of the shortcomings of the existing technology, the purpose of this utility model is to provide a quartz sand drying system that has low drying cost and does not contaminate the quartz sand.
[0004] To solve the above problems, the technical solution adopted by this utility model is as follows:
[0005] A quartz sand drying system includes a frame and a horizontal drum rotatably mounted on the frame. The frame is equipped with several support rollers for supporting the horizontal drum. It also includes a biomass hot air device. Fixed covers are fitted onto the outer sides of both ends of the frame near the horizontal drum, and these covers are rotatably sealed to the outer walls of both ends of the horizontal drum. A heat-conducting cylinder is coaxially mounted inside the horizontal drum, with both ends mounted on the frame and extending through the two fixed covers. A drying space is formed between the heat-conducting cylinder and the horizontal drum. The outlet of the biomass hot air device is connected to one end of the heat-conducting cylinder, and the other end of the heat-conducting cylinder is connected to a tail gas treatment device. A feed inlet is connected to one fixed cover near the outlet of the biomass hot air device, and a discharge outlet is provided on the other fixed cover. Both the feed inlet and the discharge outlet are connected to the drying space, which is connected to the tail gas treatment device via an exhaust pipe.
[0006] Furthermore, sliding ring grooves are provided on the outer side walls at both ends of the horizontal roller, and mounting ring grooves are provided on the inner rings of the openings of the two fixed sleeve covers. A sealing element is provided on the mounting ring groove, and the sealing element abuts against the sliding ring groove.
[0007] Furthermore, the inner wall of the horizontal drum is provided with a spiral guide plate along the axial direction.
[0008] Furthermore, the feed inlet is located at the top of the corresponding fixed sleeve cover, the discharge outlet is located at the bottom of the corresponding fixed sleeve cover, the feed inlet is connected to a feed hopper, and the discharge outlet is connected to a discharge pipe.
[0009] Furthermore, the exhaust pipe is disposed on the end of the horizontal drum near the feed inlet or on a fixed sleeve cover near the feed inlet.
[0010] Furthermore, the biomass hot air device includes a furnace body, a blower, and a hot air pipe. The furnace body is mounted on the frame, the air outlet of the blower is connected to the bottom of the furnace body, a feeding hopper is provided at the top of the furnace body, a feeding auger is provided in the feeding hopper, and the upper part of the furnace body is connected to one end of the heat conduction cylinder through the hot air pipe.
[0011] Furthermore, the furnace body is provided with a pre-combustion zone and a deflagration heat exchange zone. The feed hopper is connected to the pre-combustion zone, the air outlet of the blower is connected to the bottom of the pre-combustion zone, and one end of the hot air pipe is connected to the deflagration heat exchange zone, where a heat exchanger is provided.
[0012] Furthermore, an ash discharge door is provided at the bottom or lower part of the furnace body.
[0013] Furthermore, a baffle plate is vertically arranged at the upper part of the deflagration heat exchange zone, and the heat exchanger is located at the bottom of the baffle plate. The two sides of the upper part of the deflagration heat exchange zone are respectively connected to the pre-combustion zone and one end of the hot air pipe.
[0014] Furthermore, the outer periphery of the horizontal drum is covered with an insulation layer.
[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0016] This utility model discloses a quartz sand drying system that incorporates a heat-conducting cylinder inside a horizontal drum, forming a drying space between the heat-conducting cylinder and the horizontal drum. A biomass hot air device directly supplies hot air to the heat-conducting cylinder, allowing the quartz sand to pass through and be dried within the drying space. This drying method is simple and convenient, and it also prevents the high-temperature flue gas generated by the biomass hot air device from contacting the quartz sand, thus avoiding contamination. Furthermore, the quartz sand carried up by the rotating horizontal drum naturally falls off under automatic action, making it easier for it to contact the outer wall of the heat-conducting cylinder, increasing the contact time and opportunity between the quartz sand and the high-temperature heat source, thereby accelerating the drying efficiency. The steam within the drying space is connected to a tail gas treatment device through an exhaust pipe, preventing steam accumulation within the drying space and effectively purifying it, reducing environmental pollution.
[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Attached Figure Description
[0018] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model;
[0019] Figure 2 This is a cross-sectional view of the horizontal roller in an embodiment of this utility model;
[0020] Figure 3 This is a schematic diagram of the structure of the biomass hot air device in an embodiment of this utility model;
[0021] Figure 4 This is a cross-sectional view of the biomass hot air device in an embodiment of this utility model.
[0022] Explanation of icon numbers:
[0023] Frame 10, horizontal drum 20, heat conduction cylinder 21, drying space 22, sliding ring groove 23, spiral guide plate 24, exhaust pipe 25, insulation layer 26, biomass hot air device 30, furnace body 31, baffle plate 32, blower 33, hot air pipe 34, feeding auger 35, pre-combustion zone 36, deflagration heat exchange zone 37, heat exchanger 38, ash discharge door 39, temporary storage hopper 3a, fixed cover 40, feed port 41, discharge port 42, mounting ring groove 43, sealing element 44, exhaust gas treatment device 50. Detailed Implementation
[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.
[0025] Reference Figures 1 to 4 The illustrated quartz sand drying system includes a frame 10 and a horizontal drum 20 rotatably mounted on the frame 10. The frame 10 is equipped with several support rollers 11 for supporting the horizontal drum 20. It also includes a biomass hot air device 30. Fixed covers 40 are fitted onto the outer sides of both ends of the frame 10 near the horizontal drum 20, and the two fixed covers 40 are rotatably sealed to the outer walls at both ends of the horizontal drum 20. A heat-conducting cylinder 21 is coaxially mounted inside the horizontal drum 20, with both ends of the heat-conducting cylinder 21 mounted on the frame 10 and extending through two... The fixed cover 40 forms a drying space 22 between the heat-conducting cylinder 21 and the horizontal drum 20. The air outlet of the biomass hot air device 30 is connected to one end of the heat-conducting cylinder 21, and the other end of the heat-conducting cylinder 21 is connected to the exhaust gas treatment device 50. The fixed cover 40 near the air outlet of the biomass hot air device 30 is connected to an inlet 41, and the fixed cover 40 at the other end is provided with an outlet 42. Both the inlet 41 and the outlet 42 are connected to the drying space 22, and the drying space 22 is connected to the exhaust gas treatment device 50 through an exhaust pipe 25.
[0026] Specifically, in this application, the heat-conducting cylinder 21 and the horizontal drum 20 form a coaxial inner and outer cylinder structure, making the drying space 22 annular. This facilitates the material falling onto the heat-conducting cylinder 21 due to its own weight when the horizontal drum 20 tumbles the material, thus aiding in drying. The fixed cover 40 seals both ends of the horizontal drum 20, and its structure with the horizontal drum 20 is actually detachable for easy maintenance. For ease of maintenance, the fixed cover 40 is equipped with a closable maintenance port. Furthermore, to facilitate material transport, the drying structure composed of the heat-conducting cylinder 21 and the horizontal drum 20 is inclined, with the inlet 41 end higher and the outlet 42 end lower. This allows the material to gradually transfer along the axis of the horizontal drum 20 to the outlet 42 end using its own weight and the rolling motion of the horizontal drum 20, simultaneously achieving drying. In addition, to facilitate ash removal, a ash removal door that can be opened and closed is provided at the end of the heat conduction cylinder 21 near the discharge port 42.
[0027] It should be noted that a drive motor is also installed on the frame 10. The drive motor drives any of the idler rollers 11 to rotate, and the idler rollers 11 drive the horizontal drum 20 to rotate. Of course, in some embodiments, a gear ring is provided on the outer circumference of the horizontal drum 20, and the drive motor drives the horizontal drum 20 to rotate through gear meshing with the gear ring. The exhaust gas treatment device 50 can be a conventional boiler exhaust gas treatment system, such as patent CN202120343576.3 - a high-efficiency boiler exhaust gas treatment device or CN202110403650.0 - an industrial boiler exhaust gas treatment device and its treatment method, which will not be described in detail here. The biomass hot air device 30 can be a conventional biomass boiler in this application, such as patent CN201920862893.9 - an industrial environmentally friendly and energy-saving boiler or CN202222482819.9 - a heating boiler with exhaust gas waste heat treatment device.
[0028] This quartz sand drying system incorporates a heat-conducting cylinder 21 inside a horizontal drum 20, forming a drying space 22 between the heat-conducting cylinder 21 and the horizontal drum 20. A biomass hot air device 30 directly supplies hot air to the heat-conducting cylinder 21. The quartz sand passes through the drying space 22 and is dried. This drying method is simple and convenient, and it also prevents the high-temperature flue gas generated by the biomass hot air device 30 from contacting the quartz sand, thus avoiding contamination. Furthermore, the quartz sand carried up by the horizontal drum 20 during rotation naturally falls off under automatic action, making it easier for it to contact the outer wall of the heat-conducting cylinder 21. This increases the contact time and opportunity between the quartz sand and the high-temperature heat source, accelerating the drying process. The steam within the drying space 22 is connected to the exhaust gas treatment device 50 through an exhaust pipe 25. This prevents steam accumulation within the drying space 22 and effectively purifies the steam, reducing environmental pollution.
[0029] In the above embodiment, to ensure a sealed connection between the fixed sleeve 40 and the horizontal drum 20 and to prevent heat loss from the drying space 22, sliding annular grooves 23 are provided on the outer walls at both ends of the horizontal drum 20, and mounting annular grooves 43 are provided on the inner rings of the openings of the two fixed sleeves 40. Sealing elements 44 are provided on the mounting annular grooves 43, and the sealing elements 44 abut against the sliding annular grooves 23. The sealing elements 44 are wear parts and can be made of conventional rubber sealing materials. For ease of installation, the outer side of the mounting annular groove 43 is designed to be open, facilitating the installation of the sealing elements 44. The outer periphery of the horizontal drum 20 is covered with an insulation layer 26.
[0030] In the above embodiment, to facilitate the conveying of materials within the drying space 22 along the axial direction of the horizontal drum 20, a spiral guide plate 24 is provided on the inner wall of the horizontal drum 20 along the axial direction. The spiral guide plate 24 allows the materials to move along the axial direction of the horizontal drum 20 and gradually transfer to the discharge port 42 as the drum rotates. Simultaneously, the spiral guide plate 24 can also lift the materials, facilitating their spreading onto the heat-conducting cylinder 21.
[0031] In the improved embodiment above, in order to facilitate feeding and discharging, the feed port 41 is located at the top of the corresponding fixed cover 40, and the discharge port 42 is located at the bottom of the corresponding fixed cover 40. A temporary storage hopper 3a is connected to the feed port 41, and a discharge pipe is connected to the discharge port 42.
[0032] In the above embodiments, to facilitate the discharge of steam from the drying space 22, the exhaust pipe 25 is disposed on the end of the horizontal drum 20 near the feed inlet 41 or on the fixed cover 40 near the feed inlet 41. In actual production, a suction device is also installed on the exhaust pipe 25 to facilitate the discharge of internal steam. During normal production, the exhaust gas treatment device 50 generally has its own suction device; therefore, this application does not design an additional suction device.
[0033] See Figure 1 , Figure 3 and Figure 4 In one embodiment of this application, in order to better provide heat and utilize the high temperature generated during combustion to heat the heat-conducting cylinder 21, the biomass hot air device 30 includes a furnace body 31, a blower 33, and a hot air pipe 34. The furnace body 31 is mounted on the frame 10. The air outlet of the blower 33 is connected to the bottom of the furnace body 31. A temporary storage hopper 3a is provided on the top of the furnace body 31, and a feeding auger 35 is provided inside the temporary storage hopper 3a. The temporary storage hopper 3a can receive biomass fuel output from the output end of the external feeding conveyor belt. The upper part of the furnace body 31 is connected to the corresponding end of the heat-conducting cylinder 21 through the hot air pipe 34. In practice, the feeding conveyor belt can be replaced by a feeding auger or other structures. In this application, the hot air pipe 34 is coaxially arranged with the heat-conducting cylinder 21, and the furnace body 31 is directly set on one end of the heat-conducting cylinder 21. This design can reduce the length of the hot air pipe 34 and reduce energy loss. In addition, the temporary storage tank 3a can be set up with multiple stages, the main purpose of which is to temporarily store biomass.
[0034] See Figure 4In an improved embodiment of this application, in order to avoid incomplete combustion of biomass in the furnace body 31 and reduce the combustible material contained in the flue gas, the furnace body 31 is provided with a pre-combustion zone 36 and a deflagration heat exchange zone 37. The temporary storage hopper 3a is connected to the pre-combustion zone 36, the air outlet of the blower 33 is connected to the bottom of the pre-combustion zone 36, and one end of the hot air pipe 34 is connected to the deflagration heat exchange zone 37. A heat exchanger 38 is provided in the deflagration heat exchange zone 37. The pre-combustion zone 36 is the area where biomass undergoes initial combustion and is also the area for drying newly added biomass. Therefore, some biomass incompletely combusts in this zone. At this time, the biomass at the top is partially pyrolyzed, while the biomass at the bottom undergoes combustion. Under high temperature (around 500-600℃), a large amount of volatile matter will be released from the biomass. After the volatile matter is released, only residual charcoal remains. The volatile matter released from the thermal decomposition reaction mainly includes hydrogen, carbon monoxide, carbon dioxide, methane, tar, and other hydrocarbons. The main gasification and pyrolysis principles and conditions for dry materials are: C + O2 = CO2, CO2 + C = 2CO, etc. If insufficient air is supplied to the pre-combustion zone 36, the biomass material can burn into CO2. However, due to the continuous combustion of biomass fuel in the pre-combustion zone 36, the internal temperature can reach over 500℃. Therefore, CO2 can react with the residual char in the biomass combustion to produce carbon monoxide. Carbon monoxide and other substances will enter the deflagration heat exchange zone 37 for secondary and complete combustion, increasing the calorific value. In practice, pyrolyzing biomass fuel and then performing complete combustion is a conventional boiler setup, as illustrated in patent CN202011505592.4 - A Biomass Combustion Boiler. Therefore, both the pre-combustion zone 36 and the deflagration heat exchange zone 37 are equipped with external air intake fans to supply oxygen.
[0035] In the above embodiment, a heat exchanger 38 is provided in the deflagration heat exchange zone 37. Its purpose is to utilize the heat energy generated by the furnace body 31, for example, during the quartz sand pickling stage where heating is required. In this case, heat can be exchanged with the pickling equipment through the heat exchanger 38. Simultaneously, because the deflagration heat exchange zone 37 is a complete combustion zone, its exhaust gas temperature is very high. Even though the overall temperature of the heat-conducting cylinder 21 is relatively low, the overall heat loss is relatively large due to the flow of flue gas. That is, the higher the temperature of the flue gas discharged from the deflagration heat exchange zone 37, the higher the temperature of the flue gas entering the exhaust gas treatment device 50. Therefore, the heat exchanger 38 can appropriately reduce the temperature of the flue gas discharged from the deflagration heat exchange zone 37 to reduce the temperature of the flue gas entering the exhaust gas treatment device 50, thereby improving energy utilization.
[0036] In the above embodiment, to improve the heat exchange effect, a baffle plate 32 is vertically arranged at the upper part of the deflagration heat exchange zone 37, and the heat exchanger 38 is arranged at the bottom of the baffle plate 32. The two sides of the upper part of the deflagration heat exchange zone 37 are respectively connected to the pre-combustion zone 36 and one end of the hot air pipe 34. Therefore, the deflagration heat exchange zone 37 is U-shaped, which allows the area of the deflagration heat exchange zone 37 near the pre-combustion zone 36 to be fully combusted. The high-temperature flue gas can only flow downward and pass through the heat exchanger 38 to achieve heat exchange before entering the area near the hot air pipe 34, and finally enters the heat conduction cylinder 21 through the hot air pipe 34.
[0037] In one embodiment of this application, an ash discharge door 39 is provided at the bottom or lower part of the furnace body 31 to facilitate ash discharge. Meanwhile, to reduce energy loss, the outer periphery of the horizontal drum 20 is covered with an insulation layer.
[0038] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.
Claims
1. A quartz sand drying system comprising a frame and a horizontal roller rotatably mounted on the frame, a plurality of support rollers for supporting the horizontal roller are arranged on the frame, characterized in that, It also includes a biomass hot air device. The frame is fitted with fixed covers on the outer sides of both ends of the horizontal drum. The two fixed covers are rotatably sealed to the outer side walls of both ends of the horizontal drum. A heat-conducting cylinder is coaxially installed inside the horizontal drum. Both ends of the heat-conducting cylinder are mounted on the frame and extend through the two fixed covers. A drying space is formed between the heat-conducting cylinder and the horizontal drum. The air outlet of the biomass hot air device is connected to one end of the heat-conducting cylinder. The other end of the heat-conducting cylinder is connected to a tail gas treatment device. A feed inlet is connected to the fixed cover near the air outlet of the biomass hot air device, and a discharge outlet is provided on the fixed cover at the other end. Both the feed inlet and the discharge outlet are connected to the drying space. The drying space is connected to the tail gas treatment device through an exhaust pipe.
2. The quartz sand drying system according to claim 1, characterized in that: Sliding ring grooves are provided on the outer side walls at both ends of the horizontal roller, and mounting ring grooves are provided on the inner rings of the openings of the two fixed sleeve covers. A sealing element is provided on the mounting ring groove, and the sealing element abuts against the sliding ring groove.
3. The quartz sand drying system according to claim 1, characterized in that: The inner wall of the horizontal drum is provided with a spiral guide plate along the axial direction.
4. The quartz sand drying system according to claim 1, characterized in that: The feed inlet is located at the top of the corresponding fixed cover, and the discharge outlet is located at the bottom of the corresponding fixed cover. A temporary storage hopper is connected to the feed inlet, and a discharge pipe is connected to the discharge outlet.
5. A quartz sand drying system according to claim 2, characterized in that: The exhaust pipe is located on the end of the horizontal drum near the feed inlet or on a fixed cover near the feed inlet.
6. A quartz sand drying system according to claim 1, characterized in that: The biomass hot air device includes a furnace body, a blower, and a hot air pipe. The furnace body is installed on the frame. The air outlet of the blower is connected to the bottom of the furnace body. A temporary storage hopper is provided on the top of the furnace body. A feeding auger is provided in the temporary storage hopper. The upper part of the furnace body is connected to one end of the heat conduction cylinder through the hot air pipe.
7. A quartz sand drying system according to claim 6, characterized in that: The furnace body is provided with a pre-combustion zone and a deflagration heat exchange zone. The temporary storage hopper is connected to the pre-combustion zone. The air outlet of the blower is connected to the bottom of the pre-combustion zone. One end of the hot air pipe is connected to the deflagration heat exchange zone. A heat exchanger is provided in the deflagration heat exchange zone.
8. A quartz sand drying system according to claim 6, characterized in that: The furnace body is equipped with an ash discharge door at the bottom or lower part.
9. A quartz sand drying system according to claim 7, characterized in that: A baffle plate is vertically installed at the top of the deflagration heat exchange zone, and the heat exchanger is located at the bottom of the baffle plate. The two sides of the top of the deflagration heat exchange zone are respectively connected to the pre-combustion zone and one end of the hot air duct.
10. A quartz sand drying system according to claim 1, characterized in that: The outer periphery of the horizontal drum is covered with an insulation layer.