Conveying variable-diameter grading system for dedusting ash pretreatment

Abstract

The utility model discloses a conveying variable-diameter grading system for pretreatment of dedusting ash, which comprises a deduster ash hopper, a speed-adjustable unloader is arranged at the discharge end of the bottom of the deduster ash hopper, an initial conveying pipeline is fixedly connected to an outlet of the unloader, and a Roots blower is fixedly connected to the input end of the initial conveying pipeline through an air pipe. By means of the variable-diameter pneumatic conveying section, through the gradually-increased pipe diameter, dust is rapidly pushed through the initial high air speed, the initial resistance is overcome, the air speed is maintained, and dust sedimentation is prevented; and the long-distance conveying stability of the dedusting ash is ensured, and production is prevented from being affected. The dedusting ash is conveyed to a multi-layer composite screening machine, and the multi-layer composite screening machine screens the dedusting ash in a classified mode through a coarse vibrating screen, a medium vibrating screen and a fine vibrating screen.

Description

Technical fields:

[0001] This utility model relates to the field of dust removal ash pretreatment technology, specifically to a conveying and variable diameter grading system for dust removal ash pretreatment. Background technology:

[0002] In the coking industry, a large amount of coking dust is generated annually, and its resource utilization is crucial for the industry's green transformation. However, dust has high ash content, high alkali metal content, and complex composition, posing numerous challenges in coal blending and coking processes. For example, the uneven particle size distribution of dust affects the uniformity of coal blending and coke quality. Furthermore, traditional conveying and grading methods suffer from high energy consumption, low efficiency, and easy dust settling during transport, resulting in poor dust pretreatment and hindering its efficient utilization in coal blending and coking. Currently, existing conveying systems are ill-suited to the long-distance, low-energy-consumption transport requirements of dust, and lack precise grading methods, making it impossible to finely grade dust according to coal blending process requirements. This impacts the optimization of coal blending processes and the improvement of coke quality. Utility Model Content:

[0003] To address this issue, this utility model provides a conveying and grading system for dust removal ash pretreatment, which overcomes the problem that existing conveying systems are unable to meet the needs of long-distance, low-energy-consumption conveying of dust removal ash, and lack precise grading methods, making it impossible to finely grade dust removal ash according to coal blending process requirements, thus affecting the optimization of coal blending process and the improvement of coke quality.

[0004] This utility model is implemented by the following technical solution:

[0005] A dust collector ash pretreatment conveying and grading system includes a dust collector ash hopper with an adjustable speed unloader at its bottom discharge end. An initial conveying pipe is fixedly connected to the outlet of the unloader. A Roots blower is fixedly connected to the input end of the initial conveying pipe via an air pipe. A variable diameter pneumatic conveying section with progressively increasing pipe diameters is fixedly connected to the output end of the initial conveying pipe. The variable diameter pneumatic conveying section consists of a secondary, tertiary, and quaternary conveying pipe with progressively increasing pipe diameters connected sequentially. The output end of the initial conveying pipe is connected to the secondary conveying pipe. Each variable diameter node is equipped with a makeup air pipe and a pressure sensor. The makeup air pipe is fixedly connected to the Roots blower. The pressure sensor is fixedly mounted on the pipe at the variable diameter node connection. The pressure sensor is electrically connected to a controller with a solenoid valve. A multi-layer composite screening machine is fixedly connected to the output end of the variable diameter pneumatic conveying section. The output end of the multi-layer composite screening machine is fixedly connected to a storage silo.

[0006] Preferably, the diameter of the secondary conveying pipe in the variable diameter pneumatic conveying section is larger than that of the initial conveying pipe, and the increase in diameter of each conveying pipe does not exceed 30% of the diameter of the preceding pipe.

[0007] Preferably, the air supply direction of the air supply pipeline at each diameter change node forms an angle of 20°-45° with the material conveying direction.

[0008] Preferably, the multi-layer composite screening machine includes a coarse vibrating screen, a medium vibrating screen, and a fine vibrating screen arranged from top to bottom, and the screen mesh diameter of the coarse vibrating screen, the medium vibrating screen, and the fine vibrating screen is arranged to decrease sequentially.

[0009] Preferably, the storage silo includes coarse, medium and fine silos, and is provided with a directional diversion channel between it and the multi-layer composite screening machine. The channel includes three independent conveying branches corresponding to coarse particles, medium particles and fine particles respectively, and each conveying branch conveys to the coarse, medium and fine silos respectively.

[0010] The advantages of this invention are as follows: By using a variable-diameter pneumatic conveying section with gradually increasing pipe diameter, the dust is rapidly propelled by an initial high air velocity, overcoming initial resistance, maintaining air velocity, preventing dust settling, and ensuring the stability of long-distance dust collection, thus avoiding production disruptions. The dust is then conveyed to a multi-layer composite screening machine, which uses coarse, medium, and fine vibrating screens to classify and screen the dust. The screened dust is stored in coarse, medium, and fine silos respectively, providing refined raw materials for the coal blending process, helping to improve coal blending ratios and process parameters, and enhancing coke quality. Attached image description:

[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

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

[0013] Figure 2 This is a partial structural diagram of the present invention;

[0014] Figure 3 This is a schematic diagram of the control block of the present invention.

[0015] In the diagram: 1. Dust collector hopper; 2. Unloader; 3. Initial conveying pipeline; 4. Roots blower; 5. Variable diameter pneumatic conveying section; 6. Multi-layer composite screening machine; 7. Storage silo; 8. Secondary conveying pipeline; 9. Tertiary conveying pipeline; 10. Quaternary conveying pipeline; 11. Pressure sensor; 12. Air replenishment pipeline; 13. Solenoid valve; 14. Controller. Detailed implementation method:

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] like Figure 1 , Figure 2 , Figure 3 As shown, the conveying and grading system for dust collector pretreatment includes a dust collector hopper 1, which is used to collect dust collector ash. A discharger 2 is installed at the discharge end of the dust collector hopper 1. The discharger 2 can adjust the discharge speed according to actual needs. After the dust collector ash is discharged from the discharger 2, it enters the initial conveying pipe 3. At the same time, the Roots blower 4 provides high-speed airflow into the initial conveying pipe 3, so that the dust collector ash and the airflow are mixed to form a gas-solid two-phase flow, and pneumatic conveying begins.

[0018] The output end of the initial conveying pipeline 3 is connected to a variable diameter pneumatic conveying section 5. The variable diameter pneumatic conveying section 5 includes a secondary conveying pipeline 8, a tertiary conveying pipeline 9, and a quaternary conveying pipeline 10 connected in sequence, with the pipe diameters increasing sequentially. The diameter of the secondary conveying pipeline 8 is larger than that of the initial conveying pipeline 3. At the variable diameter node connection, a supplementary air pipeline 12 is fixedly connected. The supplementary air pipeline 12 is fixedly connected to the Roots blower 4. At the same time, a pressure sensor 11 is fixed on the pipeline at the variable diameter node connection. A solenoid valve 13 is installed on the supplementary air pipeline 12. The pressure sensor 11 and the solenoid valve 13 are electrically connected to the controller 14.

[0019] Inside the initial conveying pipe 3, the air velocity is relatively high, which can quickly propel the dust forward and overcome the large resistance at the beginning of the pipe.

[0020] When the gas-solid two-phase flow reaches the first diameter change node, the initial conveying pipe 3 is expanded to the secondary conveying pipe 8. Due to the expansion of the pipe diameter, the airflow velocity will decrease. At this time, the pressure sensor 11 detects the pressure inside the pipe in real time.

[0021] When the pressure sensor 11 detects that the pipeline pressure is lower than the set value, it indicates that the airflow speed may have decreased to near the critical value for dust settling. After receiving the pressure signal, the controller 14 triggers the solenoid valve 13 to open, and introduces supplementary air through the supplementary air pipe 12 to maintain the air speed, prevent dust from settling in the pipeline, and ensure the stability of the conveying.

[0022] Similarly, when the gas-solid two-phase flow reaches the second or third diameter change node, that is, when the secondary conveying pipe 8 conveys to the tertiary conveying pipe 9 or the tertiary conveying pipe 9 conveys to the quaternary conveying pipe 10, because the pipe diameter is set to increase sequentially, at the second or third diameter change node, the pressure sensor 11 detects that the pipe pressure is lower than the set value, indicating that the airflow velocity may have decreased to near the critical value for dust settling. After receiving the pressure signal, the controller 14 triggers the solenoid valve 13 to open, and introduces supplementary air through the supplementary air pipe 12 to maintain the air velocity, prevent dust from settling in the pipe, and ensure the stability of the conveying.

[0023] This is to meet the low energy consumption requirements of long-distance transportation, ensuring that the dust can be smoothly transported to the end, enter the multi-layer composite screening machine 6, complete the grading and screening, and finally be transported to the storage silo 7.

[0024] Because the composite screening machine 6 has three types of vibrating screens—coarse, medium, and fine—from top to bottom, it can achieve the function of classifying and screening coarse, medium, and fine particles. At the same time, because the storage bin 7 includes coarse, medium, and fine bins, the dust particles that have been screened can be collected accordingly.

[0025] Actual work process:

[0026] The dust collector hopper 1 collects dust, and the unloader 2 adjusts the unloading speed to ensure uniform discharge of the dust. The dust enters the initial conveying pipe 3, where a Roots blower 5 delivers a high-speed airflow, forming a gas-solid two-phase flow and initiating pneumatic conveying. The output end of the initial conveying pipe 3 connects to a variable-diameter pneumatic conveying section, consisting of secondary to quaternary conveying pipes with progressively increasing diameters. At the variable-diameter nodes, there is a makeup air pipe 12 and a pressure sensor 11, electrically connected to the controller 14, forming a pressure monitoring and makeup air control system.

[0027] When the gas-solid two-phase flow reaches the diameter change node, the airflow velocity decreases, and the pressure sensor 11 detects the pressure inside the pipeline. If the pressure is lower than the set value, the controller 14 triggers the solenoid valve 13 to open and replenish air, maintaining the air velocity, preventing dust settling, and ensuring conveying stability. Through the diameter change design and air replenishment regulation, the system adapts to long-distance conveying, ensuring that dust is smoothly conveyed to the end.

[0028] After passing through the variable-diameter pneumatic conveying section, the dust collected by the dust collector enters the multi-layer composite screening machine 6 for grading and screening. The multi-layer composite screening machine 6 has three types of vibrating screens: coarse, medium, and fine, to grade and screen the dust collector dust. After screening, dust collector dust particles of different sizes are respectively conveyed to the corresponding coarse, medium, and fine silos, realizing precise grading and classified storage of dust collector dust.

[0029] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A conveying and grading system for dust collector pretreatment, characterized in that, The system includes a dust collector hopper (1), with an adjustable speed unloader (2) at its bottom discharge end. An initial conveying pipe (3) is fixedly connected to the outlet of the unloader (2). A Roots blower (4) is also fixedly connected to the input end of the initial conveying pipe (3) via an air pipe. A variable diameter pneumatic conveying section (5) with progressively increasing pipe diameters is fixedly connected to the output end of the initial conveying pipe (3). The variable diameter pneumatic conveying section (5) is composed of a secondary conveying pipe (8), a tertiary conveying pipe (9), and a quaternary conveying pipe (10) with progressively increasing pipe diameters connected in sequence. The output end of the conveying pipe (3) is connected to the secondary conveying pipe (8). Each diameter-changing node is equipped with a supplementary air pipe (12) and a pressure sensor (11). The supplementary air pipe (12) is fixedly connected to the Roots blower (4). The pressure sensor (11) is fixed on the pipe at the diameter-changing node. The pressure sensor (11) is electrically connected to the controller (14) of the solenoid valve (13). A multi-layer composite screening machine (6) is fixedly connected to the output end of the variable-diameter pneumatic conveying section (5). The output end of the multi-layer composite screening machine (6) is fixedly connected to the storage silo (7).

2. The conveying and variable diameter grading system for dust removal ash pretreatment according to claim 1, characterized in that, The diameter of the secondary conveying pipe (8) in the variable diameter pneumatic conveying section (5) is larger than that of the initial conveying pipe (3), and the increase in the diameter of each conveying pipe does not exceed 30% of the diameter of the preceding pipe.

3. The conveying and variable diameter grading system for dust removal ash pretreatment according to claim 2, characterized in that, The air supply pipe (12) has an air supply direction at each diameter change node that forms an angle of 20°-45° with the material conveying direction.

4. The conveying and variable diameter grading system for dust removal ash pretreatment according to claim 3, characterized in that, The multi-layer composite screening machine (6) includes a coarse vibrating screen, a medium vibrating screen and a fine vibrating screen arranged from top to bottom, and the screen apertures of the coarse vibrating screen, the medium vibrating screen and the fine vibrating screen are arranged to decrease in sequence.

5. The conveying and variable diameter grading system for dust removal ash pretreatment according to claim 4, characterized in that: The storage silo (7) includes coarse, medium and fine silos, and is provided with a directional diversion channel between it and the multi-layer composite screening machine (6). The channel includes three independent conveying branches corresponding to coarse particles, medium particles and fine particles respectively, and each conveying branch is corresponding to convey to the coarse, medium and fine silos.

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