Granulation system for hazardous waste roasting treatment

Abstract

The utility model relates to the field of hazardous waste resource recycling treatment, and provides a granulation system for hazardous waste roasting treatment. Comprising a stirring structure, a granulation mechanism, a vibrating screen structure and a water replenishing structure, the water replenishing structure comprises a control unit, a variable-frequency water replenishing pump and at least two moisture detectors, and the two moisture detectors collect moisture content information of materials on a first conveying belt and a second conveying belt respectively and feed back the moisture content information to the control unit; the control unit controls starting, stopping and the rotating speed of the variable-frequency make-up pump, and the variable-frequency make-up pump supplements water into the stirring machine. The water replenishing system is arranged, an infrared moisture measuring instrument is adopted to measure moisture of granulation materials, the water replenishing amount is automatically adjusted according to a preset moisture interval, and closed-loop control over water replenishing operation of the granulation system is achieved; the moisture of the materials before and after stirring is monitored respectively, correction of water supplementing parameters is displayed in time, it is ensured that the granulated materials have the optimal roasting particle size, and benefits of the roasting procedure are improved.

Description

Technical Field

[0001] This utility model relates to the field of hazardous waste resource recycling and treatment, specifically to a granulation system for hazardous waste roasting disposal. Background Technology

[0002] Granulation of powdered raw materials is a necessary step before roasting hazardous waste. Granulated materials are more stable and less prone to dust dispersion, thus reducing dust generation and diffusion and maintaining a relatively clean working environment. Furthermore, granular materials have better flowability and permeability, which helps maintain ventilation paths between material layers, ensuring more thorough roasting, and also promotes the formation and density of the sintered body. Moisture content in the material has a significant impact on granulation results. Too little moisture cannot guarantee granulation; too much moisture will result in excessively large granules, affecting subsequent transportation and increasing fuel costs in the later roasting stages. In traditional processes, the moisture content of the granulated material is mainly determined visually by skilled workers, relying on subjective judgment of the granulation effect to determine whether and how to adjust the moisture level. This manual observation has a large margin of error, resulting in insufficient control over the granulation effect. Therefore, a more precise monitoring method is needed to control the moisture content of the granulated material within a reasonable range to improve granulation results and, consequently, the efficiency of the roasting process. Summary of the Invention

[0003] In order to ensure that the particle size and other properties of solid waste particles entering the roasting furnace meet production requirements and improve the efficiency of hazardous waste roasting, this utility model provides a granulation system for hazardous waste roasting treatment.

[0004] The technical solution adopted by this utility model is as follows:

[0005] A granulation system for hazardous waste roasting includes a stirring structure, a granulation mechanism, and a vibrating screen structure. The stirring structure includes a stirring support and a mixer. The input port of the mixer is connected to the raw material silo via a first conveyor belt. The discharge port at the bottom of the stirring mechanism is connected to the granulation mechanism via a second conveyor belt. The granulation mechanism includes a granulator and a granulator frame. The output end of the granulator is connected to the vibrating screen structure. The vibrating screen structure includes a vibrating screen and a vibrating screen support. The output end of the vibrating screen is connected to the feeding port at the top of the roasting furnace via a third transmission belt. The system also includes a water replenishment structure, which includes a control unit, a variable frequency water replenishment pump, and at least two moisture detectors. The two moisture detectors collect the moisture content information of the materials on the first and second conveyor belts and feed it back to the control unit. The control unit controls the start, stop, and speed of the variable frequency water replenishment pump, which replenishes water to the mixer.

[0006] Furthermore, the moisture detector is a non-contact infrared moisture meter.

[0007] Furthermore, a fourth conveyor belt is provided below the screen of the vibrating screen, and the fourth conveyor belt is connected to the second conveyor belt through a fifth conveyor belt.

[0008] Furthermore, the output port of the mixer is connected to the second conveyor belt via a guide pipe, and a gate valve is installed on the guide pipe.

[0009] Furthermore, the granulator includes a granulation shell, which is cylindrical and inclined from the feed end to the discharge end. The two ends of the granulation shell are supported by a pair of rotating supports on the granulator frame. An external gear ring is installed in the middle of the granulation shell, and the external gear ring meshes with a reduction mechanism on the granulator shell for transmission.

[0010] Furthermore, the vibrating screen is inclined from the input end to the output end, and the bottom of the vibrating screen is supported by four elastic supports on the vibrating screen bracket. The bottom of the vibrating screen is provided with a guide cavity, and the outlet of the guide cavity is located directly above the fourth conveyor belt. The fourth conveyor belt is arranged perpendicular to the length direction of the vibrating screen, and the fifth conveyor belt is arranged perpendicular to the fourth conveyor belt.

[0011] After adopting the above technical solutions, the beneficial effects of this utility model are as follows: by setting up a water replenishment system and using an infrared moisture meter to measure the moisture content of the granulated material, and adjusting the water replenishment amount automatically according to the pre-given moisture range, the water replenishment operation of the granulation system is closed-loop controlled; by monitoring the moisture content of the material before and after stirring, the correction of the water replenishment parameters is displayed in a timely manner, ensuring that the granulated material has the optimal roasting particle size, thus improving the efficiency of the roasting process. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model.

[0013] In the diagram: 1. Raw material silo; 2. First conveyor belt; 3. Mixing support; 4. Mixer; 5. Guide pipe; 6. Second conveyor belt; 7. Control unit; 8. Variable frequency water pump; 9. Two moisture detectors; 10. Water flow meter; 11. Granulator; 12. Granulator frame; 13. Rotary support; 14. External gear ring; 15. Reduction mechanism; 16. Vibrating screen; 17. Vibrating screen support; 18. Elastic support; 19. Third transmission belt; 20. Guide cavity; 21. Fourth conveyor belt; 22. Fifth conveyor belt. Detailed Implementation

[0014] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings:

[0015] like Figure 1As shown, the granulation system for hazardous waste roasting disposal consists of a raw material silo 1, a stirring structure, a water replenishment structure, a granulation mechanism, a vibrating screen structure, and conveying devices between the various structures. It is used to mix powdered hazardous waste raw materials with water, granulate them, and then send them into the roasting furnace for roasting and resource recovery of heavy metals.

[0016] The raw material silo 1 contains various raw material powders that have been pulverized and thoroughly mixed. The raw materials are fed into the mixing structure from the bottom of the raw material silo 1 via the first conveyor belt 2. The mixing structure consists of a mixing support 3 and a mixer 4. The output port of the mixer 4 guides the mixed material onto the second conveyor belt 6 via a guide pipe 5.

[0017] The water replenishment structure replenishes water to the material through the feed inlet of the mixing structure. Water and material are thoroughly mixed within the mixer 4 to ensure uniform moisture content. A gate valve is installed on the guide pipe 6, and the fully mixed material is discharged to the second conveyor belt 6. The water replenishment structure consists of a control unit 7, a variable frequency water replenishment pump 8, and two moisture detectors 9. The two moisture detectors 9 are OMM3000 non-contact infrared moisture meters, which collect moisture content information of the material on the first conveyor belt 2 and the second conveyor belt 6, respectively, and feed it back to the control unit 7. The control unit 7 controls the start / stop and speed of the variable frequency water replenishment pump 8, as well as the water replenishment flow meter 10 on the output pipe of the variable frequency water replenishment pump 8, to achieve precise water replenishment into the mixer 4. The moisture detector 9 corresponding to the second conveyor belt 6 is used to track and monitor the moisture content of the mixed material and adjust the amount of water replenishment in a timely manner.

[0018] The second conveyor belt 6 feeds the mixed material into the granulation mechanism. The granulation mechanism consists of a granulator 11 and a granulator frame 12. The granulator 11 includes a granulation shell, which is cylindrical and inclined from the feed end to the discharge end. The two ends of the granulation shell are supported by a pair of rotating supports 13 on the granulator frame. An external gear ring 14 is installed in the middle of the granulation shell, and the external gear ring 14 meshes with a reduction gear 15 on the granulator shell for transmission. The mixed material is turned over and granulated in the granulator, and the granules are output from the granulator and sent to the vibrating screen structure.

[0019] The vibrating screen structure consists of a vibrating screen 16 and a vibrating screen support 17 supporting the vibrating screen 16. The vibrating screen 16 is inclined from the input end to the output end. The bottom of the vibrating screen 16 is supported by four elastic supports 18 on the vibrating screen support 17. The output end of the vibrating screen 16 sends the qualified particles after screening to the feeding port at the top of the roasting furnace through the third transmission belt 19. The bottom of the vibrating screen 16 is provided with a guide cavity 20. Particles that do not meet the size requirements fall from the screen of the vibrating screen into the guide cavity 20 and are sent to the fourth conveyor belt 21 by the guide cavity 20. The fourth conveyor belt 21 is set perpendicular to the length direction of the vibrating screen 16. The fourth conveyor belt 21 sends the unqualified particles to the fifth conveyor belt 22, and then to the second conveyor belt 6, and then to the granulator 11 for regranulation.

[0020] The working process of this technical solution is as follows: the raw material falls from the raw material silo 1 to the first conveyor belt 2 after being weighed, and is then fed into the mixer 4. Before the raw material enters the mixer 4, a moisture detector 9 installed above the first conveyor belt obtains its moisture parameters and sends them to the control unit 7. The control unit 7 calculates the flow rate of water that should be added to the raw material based on the given target moisture parameters, the existing moisture parameters of the raw material, and the raw material conveying volume, and adjusts the operating frequency of the variable frequency water pump 8 in real time based on the measurement value of the water supply flow meter.

[0021] The mixer 4 operates intermittently. After the first conveyor belt 2 completes material transport and the variable frequency water pump 8 completes water replenishment, the mixer 4 begins operation. After the mixer 4 finishes mixing the material, it opens the gate valve to discharge the material, and the second conveyor belt 6 begins transporting the mixed material to the granulator 11 for granulation. During this process, the moisture detector 9, installed above the second conveyor belt 6, again detects the moisture content of the material to verify whether the moisture content of the material after water replenishment and mixing is within the expected target moisture parameter range. If the material moisture content meets expectations, the existing water pump operating parameters are maintained; if it does not meet expectations, the water pump operating parameters need to be adjusted accordingly.

[0022] After the material is granulated in the granulator 11, it will be screened by the vibrating screen 16. The material that meets the particle size requirements on the screen will be sent to the calcining furnace via the third conveyor belt 19; the powdery material that has not been granulated and the material with smaller particle size that is not screened will be sent back to the second conveyor belt 6 by the fourth conveyor belt 21 and the fifth conveyor belt 22 to re-enter the granulator 11 for granulation.

Claims

1. A granulation system for hazardous waste roasting disposal, comprising a stirring structure, a granulation mechanism, and a vibrating screen structure. The stirring structure includes a stirring support and a mixer. The input port of the mixer is connected to a raw material silo via a first conveyor belt. The discharge port at the bottom of the stirring mechanism is connected to the granulation mechanism via a second conveyor belt. The granulation mechanism includes a granulator and a granulator frame. The output end of the granulator is connected to the vibrating screen structure. The vibrating screen structure includes a vibrating screen and a vibrating screen support. The output end of the vibrating screen is connected to the feeding port at the top of the roasting furnace via a third transmission belt. The system is characterized in that... It also includes a water replenishment structure, which includes a control unit, a variable frequency water replenishment pump, and at least two moisture detectors. The two moisture detectors collect the moisture content information of the materials on the first conveyor belt and the second conveyor belt, respectively, and feed it back to the control unit. The control unit controls the start, stop, and speed of the variable frequency water replenishment pump, and the variable frequency water replenishment pump replenishes water into the mixer.

2. The granulation system for hazardous waste roasting disposal according to claim 1, characterized in that, The moisture detector is a non-contact infrared moisture meter.

3. The granulation system for hazardous waste roasting disposal according to claim 1, characterized in that, A fourth conveyor belt is provided below the screen of the vibrating screen, and the fourth conveyor belt is connected to the second conveyor belt through a fifth conveyor belt.

4. The granulation system for hazardous waste roasting disposal according to claim 1, characterized in that, The output port of the mixer is connected to the second conveyor belt through a guide pipe, and a gate valve is installed on the guide pipe.

5. The granulation system for hazardous waste roasting disposal according to claim 1, characterized in that, The granulator includes a granulation shell, which is cylindrical and inclined from the feed end to the discharge end. The two ends of the granulation shell are supported by a pair of rotating supports on the granulator frame. An external gear ring is installed in the middle of the granulation shell and meshes with a reduction mechanism on the granulator shell for transmission.

6. The granulation system for hazardous waste roasting disposal according to claim 3, characterized in that, The vibrating screen is inclined from the input end to the output end. The bottom of the vibrating screen is supported by four elastic supports on the vibrating screen bracket. The bottom of the vibrating screen is provided with a guide cavity. The outlet of the guide cavity is located directly above the fourth conveyor belt. The fourth conveyor belt is arranged perpendicular to the length direction of the vibrating screen. The fifth conveyor belt is arranged perpendicular to the fourth conveyor belt.

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