Screening device for fly ash solidification system
Patent Information
- Application Number
- CN202522188544.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-16
- Publication Date
- 2026-09-29
- Estimated Expiration
- 2035-10-16
AI Technical Summary
[0003]而随着飞灰资源化技术的发展，为了提高资源化产品的成品质量，对飞灰的颗粒大小存在一定要求，传统方式是将布袋除尘器捕集的所有飞灰经水洗、固化之后才转运至颗粒筛选机进行筛选，导致所有飞灰都按最高标准处理造成系统资源浪费
[0014]通过采用上述技术方案，飞灰中转罐下方输出的飞灰经输送刚性管到达星型卸料阀，在星型卸料阀的控制下逐渐向下密封输送，而后经过输送柔性管落于筛选腔的筛选板上，一方面，输送刚性管为星型卸料阀提供可靠的固定结构和稳定的飞灰输出，另一方面，输送柔性管大大削弱了经筛选座传递至星型卸料阀的高频振动，有效降低星型卸料阀因高频振动而产生故障的可能，延长使用寿命，此外，星型卸料阀还根据实际情况自由调节输送速率，更具实用性。
Smart Images
Figure CN224807800U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of waste incineration power generation equipment, specifically to a fly ash grading and screening device for a fly ash solidification system. Background Technology
[0002] Fly ash is a hazardous waste generated during waste-to-energy incineration, rich in heavy metals and dioxins. Improper disposal can severely harm the environment. Fly ash resource utilization aims to "turn waste into treasure," with the core being the removal of soluble salts and the fixation of heavy metals through pretreatment technologies such as washing and stabilization / solidification. The treated fly ash can then be used as a raw material for building materials, such as cement, concrete bricks, or ceramics, effectively encapsulating heavy metals within a stable lattice. This process not only achieves the harmlessness and reduction of hazardous waste but also saves natural raw materials and landfill space. It is a key link in promoting a circular economy and the construction of "zero-waste cities," achieving a win-win situation for both environmental and economic benefits.
[0003] With the development of fly ash resource utilization technology, in order to improve the quality of the finished products, there are certain requirements for the particle size of fly ash. The traditional method is to wash and solidify all the fly ash collected by the bag filter before transferring it to the particle screening machine for screening. This results in all fly ash being treated according to the highest standards, causing a waste of system resources. Utility Model Content
[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a screening device for a fly ash solidification system that reduces resource waste.
[0005] To achieve the above objectives, this utility model provides the following technical solution: It includes a fly ash transfer tank and a screening seat located below the fly ash transfer tank. The fly ash transfer tank has an ash inlet on its side that connects to the ash outlet of a bag filter. The screening seat contains a screening chamber. A conveying mechanism is located below the fly ash transfer tank to gradually transport the fly ash towards the front end of the screening chamber. A screening plate is horizontally arranged in the screening chamber, dividing it into an upper channel and a lower channel. The screening plate has screening holes for screening the fly ash and allowing qualified fly ash to fall into the lower channel. Multiple springs are respectively arranged on both sides of the screening seat. A spring seat is provided, and a vibration spring is provided between the spring seat and the screening seat. A vibration motor unit is provided at the bottom of the spring seat to drive the fly ash to move from front to back. The upper channel is longer than the screening plate and forms a waste discharge port behind the screening plate. The waste discharge port is provided with a waste discharge mechanism to discharge unqualified fly ash into a waste container. A partition wall is provided below the rear end of the screening plate to separate the upper channel and the lower channel. A transfer port is provided below the rear end of the lower channel. The transfer port is provided with a transfer mechanism to transfer qualified fly ash to a water washing device. The screening seat is also provided with a leak-proof mechanism to prevent fly ash from leaking with the airflow.
[0006] By adopting the above technical solution, the fly ash collected at the ash discharge position of the bag filter is transported to the fly ash transfer tank through a sealed transmission method (scraper conveyor, pneumatic conveyor, etc.). The fly ash is then gradually conveyed to the screening chamber by the conveying mechanism. The fly ash entering the screening chamber falls onto the screening plate. Under the action of the vibrating motor unit, the fly ash moves horizontally backward along the screening plate. During the movement, qualified fly ash gradually falls from the upper channel into the lower channel through the screening holes. Unqualified fly ash in the upper channel moves to the waste discharge port and is discharged to the waste container by the waste discharge mechanism. Qualified fly ash in the lower channel moves to the transfer port and is transferred to the water washing device by the transfer mechanism for the next water washing process. The above-mentioned device has the following advantages: ① It screens fly ash according to particle size before the water washing process in the curing system, avoiding the waste of system resources caused by treating all fly ash according to the highest standard; ② A single vibration motor unit can realize the screening of fly ash, the transfer of qualified fly ash and the transfer of unqualified fly ash, making the structure more streamlined; ③ Since the upper and lower channels are constantly in the process of transmission, a leak-proof mechanism is added to meet the requirements of the curing system, preventing fly ash from leaking with the airflow and avoiding environmental pollution and waste of fly ash resources; ④ An additional fly ash transfer tank is added, which serves two purposes: firstly, to balance the flow difference of fly ash transmission, and secondly, to provide sufficient fly ash storage space during routine maintenance of the screening seat, without stopping other equipment, thus ensuring system efficiency.
[0007] The present invention is further configured such that: the leak prevention mechanism includes a gas supply hose and a recovery hose; the gas supply hose connects the rear end of the screening chamber to an inert gas source and introduces inert gas into the screening chamber; a gas supply control valve is provided at the connection between the gas supply hose and the screening chamber to control the opening and closing of the gas supply hose; the recovery hose connects the front end of the screening chamber to a bag filter; and the recovery hose is equipped with a centrifugal fan to transport the airflow to the bag filter.
[0008] By adopting the above technical solution, the inert gas is introduced into the rear end of the screening chamber through the gas supply hose, while the negative pressure generated by the centrifugal fan guides the inert gas towards the front end of the screening chamber. During the flow of the inert gas, the floating fly ash is carried into the recovery hose and finally recovered to the bag filter. The inert gas flows in the opposite direction to the particle transport path, which hinders the leakage path of the floating fly ash and makes the leakage prevention effect better. At the same time, all the floating fly ash is recovered, so that resources are fully utilized. In addition, the inlet of the inert gas source and the centrifugal fan and outlet effectively balance the air pressure inside the screening chamber, and the small amount of negative pressure generated by the centrifugal fan only guides the airflow and does not affect the fly ash transport.
[0009] The present invention is further configured such that: the waste discharge mechanism includes a waste discharge hopper and a retractable corrugated pipe, the waste discharge hopper is fixed to the screening seat and its upper end is connected to the waste discharge port, the upper end of the retractable corrugated pipe is connected to the lower end of the waste discharge hopper, and the lower end serves as the docking end for docking with the waste container.
[0010] By adopting the above technical solution, the unqualified fly ash collected in the waste discharge hopper reaches the waste container through the expandable corrugated pipe. After accumulating to a certain extent, the unqualified fly ash is uniformly processed through the waste container. At the same time, due to its structural characteristics, the expandable corrugated pipe can penetrate deep into the waste container, avoiding excessive drop that could cause unqualified fly ash to be thrown up and leak. In addition, the vibration motor unit can also make the waste discharge hopper vibrate to prevent unqualified fly ash from accumulating.
[0011] The present invention is further configured such that: the transfer mechanism includes a transfer hopper, a transfer hose and a scraper conveyor; the transfer hopper is fixed to the screening seat and its upper end is connected to the transfer port; the transfer hose connects the lower end of the transfer hopper to the feed inlet of the scraper conveyor; and the discharge port of the scraper conveyor extends to the washing device and is connected to the washing device.
[0012] By adopting the above technical solution, the qualified fly ash collected in the transfer hopper is transferred to the scraper conveyor via the transfer hose, and then the scraper conveyor is sealed and transferred to the washing device for washing. This effectively avoids leakage of qualified fly ash during the transfer process. At the same time, the transfer hose effectively reduces the high-frequency vibration transmitted to the scraper conveyor through the screening seat, effectively reducing the possibility of failure of the scraper conveyor due to high-frequency vibration and extending its service life. In addition, the vibration motor unit can also make the transfer hopper vibrate to avoid the accumulation of qualified fly ash.
[0013] The present invention is further configured such that: the conveying mechanism includes a rigid conveying pipe, a star-shaped discharge valve, and a flexible conveying pipe; the upper end of the rigid conveying pipe is connected to the fly ash transfer tank; the star-shaped discharge valve is fixed to the lower end of the rigid conveying pipe and its inlet is connected to the lower end of the rigid pipe; and the flexible conveying pipe connects the outlet of the star-shaped discharge valve to the screening chamber.
[0014] By adopting the above technical solution, the fly ash output from the bottom of the fly ash transfer tank reaches the rotary valve via a rigid conveying pipe. Under the control of the rotary valve, it is gradually conveyed downwards in a sealed manner, and then falls onto the screening plate of the screening chamber via a flexible conveying pipe. On the one hand, the rigid conveying pipe provides a reliable fixed structure and stable fly ash output for the rotary valve. On the other hand, the flexible conveying pipe greatly reduces the high-frequency vibration transmitted to the rotary valve via the screening seat, effectively reducing the possibility of failure caused by high-frequency vibration and extending the service life. In addition, the rotary valve can freely adjust the conveying speed according to the actual situation, making it more practical. Attached Figure Description
[0015] Figure 1 This is a perspective view of a specific embodiment of the present utility model; Figure 2 This is a structural schematic diagram of a specific embodiment of the present utility model. Detailed Implementation
[0016] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0017] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0018] like Figure 1 — Figure 2As shown, this utility model discloses a screening device for a fly ash solidification system, including a fly ash transfer tank 1 and a screening seat 2 located below the fly ash transfer tank 1. The fly ash transfer tank 1 has an ash inlet 11 on its side that connects to the ash outlet of a bag filter. The screening seat 2 has a screening chamber 21 inside. A conveying mechanism is located below the fly ash transfer tank 1 to gradually transport the fly ash towards the front end of the screening chamber 21. A screening plate 22 is horizontally arranged in the screening chamber 21, dividing the screening chamber 21 into an upper channel 23 and a lower channel 24. The screening plate 22 is equipped with screening holes to screen fly ash and allow qualified fly ash to fall into the lower channel 24. Multiple spring seats 25 are respectively provided on both sides of the screening base 2. A vibration spring 251 is provided between the spring seat 25 and the screening base 2. A vibration motor unit 26 is provided at the bottom of the spring seat 25 to drive the fly ash to move from front to back. The upper channel 23 is longer than the screening plate 22 and forms a waste discharge port 231 behind the screening plate 22. The waste discharge port 231 is equipped with a waste discharge mechanism to discharge unqualified fly ash into a waste container. A partition wall 221 separating the upper channel 23 and the lower channel 24 is provided below the rear end of the selection plate 22. A transfer port 241 is provided below the rear end of the lower channel 24. The transfer port 241 is equipped with a transfer mechanism to transfer qualified fly ash to the washing device. The screening seat 2 is also equipped with a leak-proof mechanism to prevent fly ash from leaking with the airflow. The fly ash collected at the ash outlet of the bag filter is transferred to the fly ash transfer tank 1 by a sealed transmission method (scraper conveyor, pneumatic conveyor, etc.). Then, the fly ash is gradually conveyed to the screening chamber 21 by the conveying mechanism. The fly ash entering the screening chamber 21 falls onto the screening plate 22. Under the action of the vibration motor unit 26, the fly ash moves horizontally backward along the screening plate 22. During the movement, qualified fly ash gradually falls from the upper channel 23 into the lower channel 24 through the screening holes. The unqualified fly ash in the upper channel 23 moves to the waste discharge port 231 and is discharged to the waste container by the waste discharge mechanism. The qualified fly ash in the lower channel 24 moves to the transfer port 241 and is transferred to the water washing device by the transfer mechanism for the next water washing process. The above-mentioned device has the following advantages: ① Fly ash is screened according to particle size before the water washing process in the curing system, avoiding the waste of system resources caused by treating all fly ash according to the highest standard; ② A single vibration motor unit 26 can realize the screening of fly ash, the transmission of qualified fly ash and the transmission of unqualified fly ash, making the structure more streamlined; ③ Since the upper channel 23 and the lower channel 24 are always in the transmission process, a leak-proof mechanism is added to meet the requirements of the curing system, preventing fly ash from leaking with the airflow and avoiding environmental pollution and waste of fly ash resources; ④ An additional fly ash transfer tank 1 is added, which serves two purposes: firstly, to balance the flow difference of fly ash transmission, and secondly, to provide sufficient fly ash storage space during routine maintenance of the screening seat 2, without stopping other equipment, thus ensuring system efficiency.
[0019] The leak-proof mechanism includes a make-up air hose 3 and a recovery hose 4. The make-up air hose 3 connects the rear end of the screening chamber 21 to an inert gas source and introduces inert gas into the screening chamber 21. A make-up air control valve 31 is installed at the connection between the make-up air hose 3 and the screening chamber 21 to control the on / off state of the make-up air hose 3. The recovery hose 4 connects the front end of the screening chamber 21 to a bag filter. The recovery hose 4 is equipped with a centrifugal fan 41 that conveys the airflow to the bag filter. Because the dust concentration in the make-up air hose 3 is low, the centrifugal fan 41 is fully capable of conveying the airflow. The make-up air hose 3 introduces inert gas into the rear end of the screening chamber 21 while the centrifugal fan... The negative pressure generated by 41 guides the inert gas towards the front end of the screening chamber 21. During the flow of the inert gas, it carries the floating fly ash into the recovery hose 4 and is eventually recovered to the bag filter. The inert gas flows in the opposite direction to the particle transport path, which hinders the leakage path of the floating fly ash and makes the leakage prevention effect better. At the same time, all the floating fly ash is recovered, so that resources are fully utilized. In addition, the inlet of the inert gas source and the centrifugal fan 41 and outlet effectively balance the air pressure inside the screening chamber 21, and the small amount of negative pressure generated by the centrifugal fan 41 only guides the airflow and does not affect the fly ash transport.
[0020] The waste discharge mechanism includes a waste discharge hopper 5 and a retractable corrugated pipe 51. The waste discharge hopper 5 is fixed to the screening seat 2 and its upper end is connected to the waste discharge port 231. The upper end of the retractable corrugated pipe 51 is connected to the lower end of the waste discharge hopper 5, and the lower end serves as the docking end for connecting with the waste container. The unqualified fly ash collected in the waste discharge hopper 5 reaches the waste container through the retractable corrugated pipe 51. After accumulating to a certain extent, the unqualified fly ash is uniformly processed through the waste container. At the same time, due to its structural characteristics, the retractable corrugated pipe 51 can penetrate to a deeper position in the waste container to avoid excessive drop causing unqualified fly ash to be thrown up and cause leakage. In addition, the vibration motor unit 26 can also make the waste discharge hopper 5 vibrate to prevent unqualified fly ash from accumulating.
[0021] The transfer mechanism includes a transfer hopper 6, a transfer hose 61, and a scraper conveyor 62. The transfer hose 61 can be made of shock-absorbing material such as rubber. The transfer hopper 6 is fixed to the screening seat 2 and its upper end is connected to the transfer port 241. The transfer hose 61 connects the lower end of the transfer hopper 6 to the feed inlet of the scraper conveyor 62. The discharge port of the scraper conveyor 62 extends to and is connected to the washing device. The qualified fly ash collected in the transfer hopper 6 reaches the scraper conveyor 62 through the transfer hose 61, and is then sealed and transferred to the washing device for washing. This effectively avoids leakage of qualified fly ash during the transfer process. At the same time, the transfer hose 61 effectively weakens the high-frequency vibration transmitted to the scraper conveyor 62 through the screening seat 2, effectively reducing the possibility of failure of the scraper conveyor 62 due to high-frequency vibration and extending its service life. In addition, the vibration motor unit 26 can also make the transfer hopper 6 vibrate to prevent the accumulation of qualified fly ash.
[0022] The conveying mechanism includes a rigid conveying pipe 7, a rotary valve 71, and a flexible conveying pipe 72. The flexible conveying pipe 72 can be made of shock-absorbing material such as rubber. The upper end of the rigid conveying pipe 7 is connected to the fly ash transfer tank 1. The rotary valve 71 is fixed to the lower end of the rigid conveying pipe 7, and its inlet is connected to the lower end of the rigid conveying pipe 7. The flexible conveying pipe 72 connects the outlet of the rotary valve 71 to the screening chamber 21. The fly ash output from the bottom of the fly ash transfer tank 1 reaches the rotary valve 71 via the rigid conveying pipe 7, and gradually... The material is conveyed downwards in a sealed manner, and then falls onto the screening plate 22 of the screening chamber 21 through the flexible conveying pipe 72. On the one hand, the rigid conveying pipe 7 provides a reliable fixing structure and stable fly ash output for the star discharge valve 71. On the other hand, the flexible conveying pipe 72 greatly reduces the high-frequency vibration transmitted to the star discharge valve 71 through the screening seat 2, effectively reducing the possibility of failure of the star discharge valve 71 due to high-frequency vibration and extending its service life. In addition, the star discharge valve 71 can freely adjust the conveying speed according to the actual situation, making it more practical.
Claims
1. A screening device for a fly ash solidification system, characterized in that: The system includes a fly ash transfer tank and a screening seat located below the fly ash transfer tank. The fly ash transfer tank has an ash inlet on its side that connects to the ash outlet of a bag filter. The screening seat contains a screening chamber. A conveying mechanism is located below the fly ash transfer tank to gradually transport the fly ash towards the front end of the screening chamber. A screening plate is horizontally arranged in the screening chamber, dividing it into an upper channel and a lower channel. The screening plate has screening holes for screening the fly ash and allowing qualified fly ash to fall into the lower channel. Multiple spring seats are respectively arranged on both sides of the screening seat. The spring seats are connected to the screening... A vibration spring is installed between the seats. A vibration motor unit is installed at the bottom of the spring seat to drive the fly ash to move from front to back. The upper channel is longer than the screening plate and forms a waste discharge port behind the screening plate. The waste discharge port is equipped with a waste discharge mechanism to discharge unqualified fly ash into a waste container. A partition wall is installed below the rear end of the screening plate to separate the upper channel and the lower channel. A transfer port is installed below the rear end of the lower channel. The transfer port is equipped with a transfer mechanism to transfer qualified fly ash to a water washing device. The screening seat is also equipped with a leak-proof mechanism to prevent fly ash from leaking with the airflow.
2. The screening device for the fly ash solidification system according to claim 1, characterized in that: The leak prevention mechanism includes a gas supply hose and a recovery hose. The gas supply hose connects the rear end of the screening chamber to an inert gas source and introduces inert gas into the screening chamber. A gas supply control valve is provided at the connection between the gas supply hose and the screening chamber to control the opening and closing of the gas supply hose. The recovery hose connects the front end of the screening chamber to a bag filter. The recovery hose is equipped with a centrifugal fan to deliver the airflow to the bag filter.
3. The screening device for the fly ash solidification system according to claim 1, characterized in that: The waste discharge mechanism includes a waste discharge hopper and a retractable corrugated pipe. The waste discharge hopper is fixed to the screening seat and its upper end is connected to the waste discharge port. The upper end of the retractable corrugated pipe is connected to the lower end of the waste discharge hopper, and its lower end serves as the docking end for connecting with the waste container.
4. The screening device for the fly ash solidification system according to claim 1, characterized in that: The transfer mechanism includes a transfer hopper, a transfer hose, and a scraper conveyor. The transfer hopper is fixed to the screening seat and its upper end is connected to the transfer port. The transfer hose connects the lower end of the transfer hopper to the feed inlet of the scraper conveyor. The discharge outlet of the scraper conveyor extends to and is connected to the washing device.
5. The screening device for the fly ash solidification system according to claim 1, characterized in that: The conveying mechanism includes a rigid conveying pipe, a star-shaped discharge valve, and a flexible conveying pipe. The upper end of the rigid conveying pipe is connected to the fly ash transfer tank. The star-shaped discharge valve is fixed to the lower end of the rigid conveying pipe and its inlet is connected to the lower end of the rigid pipe. The flexible conveying pipe connects the outlet of the star-shaped discharge valve to the screening chamber.