Device for conveying materials through circulating air

Abstract

The utility model discloses a device for conveying materials by utilizing circulating air, which consists of a frequency conversion fan, a conveying pipeline, an air supply pressure difference sensor, a safety valve, a rotary feeding valve, a conveying bin, a cyclone separator, a pulse back-blowing device, a bag-type dust collector, an air return pressure difference sensor and a control module. Continuous outdoor fresh air conveying is changed into circulating air conveying, pollution of fine material dust entrained in conveying air for conveying materials and gas volatilized by the materials to the outdoor atmospheric environment can be reduced, meanwhile, the influence of loss of fine dust on the material yield is reduced, the pollution influence of material conveying of a production enterprise on the surrounding environment is avoided, and the production efficiency is improved. Therefore, the conveying effect and the conveying quality of the materials are improved.

Description

Technical Field

[0001] This utility model relates to the field of pipeline transportation technology for powder materials, and directly relates to a device for transporting materials using circulating air. Background Technology

[0002] Currently, traditional material conveying methods include solid conveyor belt conveying, liquid pipeline conveying, solid auger conveying, and pneumatic conveying. Among these, pneumatic conveying of powder materials (or materials containing some small particles) has low energy consumption and minimal pipeline wear. Traditional pneumatic conveying generally uses outdoor natural air from the production site as the conveying medium continuously. After the conveying air enters the conveying pipeline (some specific conveying air requires pretreatment), it is conveyed together with the material to the destination equipment for separation. After the separated conveying air is discharged, the fine dust carried by it and the gases volatilized from the material cause pollution to the atmosphere. Therefore, it is essential to study a device that uses circulating air to convey materials. Summary of the Invention

[0003] The purpose of this invention is to address the problems of continuous use of outdoor fresh air polluting the outdoor environment and material loss due to entrained fine particles in the conveying air during the powder material conveying process. The invention researches a device for conveying materials using circulating air, and its technical solution is as follows:

[0004] This utility model discloses a device for conveying materials using circulating air, comprising a variable frequency fan 1, a conveying pipeline 2, a supply air differential pressure sensor 3, a safety valve 4, a rotary feed valve 5, a conveying hopper 6, a cyclone separator 7, a pulse backflushing device 8, a bag filter 9, a return air differential pressure sensor 10, and a control module 11. The outlet of the variable frequency fan 1 is connected to the outlet of the rotary feeder valve 5 through the conveying pipe 2. The air pressure differential sensor 3 and the safety valve 4 are installed near the air outlet of the variable frequency fan 1 in the conveying pipe 2. The outlet of the conveying hopper 6 is connected to the rotary feeder valve 5. The rotary feeder valve 5 is connected to the conveying pipe 2 through a pipe. The conveying pipe 2 is then connected to the inlet of the cyclone separator 7. The bottom outlet of the cyclone separator 7 is connected to the storage hopper. The top outlet is connected to the inlet of the bag filter 9 after passing through a two-stage cyclone. The top of the bag filter 9 is equipped with a pulse back-blowing device 8. The outlet of the bag filter 9 is connected to the inlet of the variable frequency fan 1 through a pipe. The return air pressure differential sensor 10 is installed on the inlet pipe of the variable frequency fan 1.

[0005] Furthermore, the control module 11 is electrically connected to the variable frequency fan 1, the supply air differential pressure sensor 3, the safety valve 4, the rotary feed valve 5, and the return air differential pressure sensor 10.

[0006] Furthermore, all corners of the conveying pipeline 2 are rounded to reduce air resistance and wear on the conveying pipeline.

[0007] Furthermore, the inner wall of the conveying pipe 2 is lined with polyurethane (PU) to improve wear resistance and corrosion resistance.

[0008] The purpose of this utility model is achieved as follows: Before the material is conveyed, the control module sends a signal to start the variable frequency fan. After the variable frequency fan is running normally, the entire conveying system forms a negative pressure circulation loop. After the set pressure difference (supply air pressure difference sensor - return air pressure difference sensor = 500~1500Pa) is normal, the control module sends a signal to start the rotary feed valve. The material enters the conveying pipeline through the rotary feed valve. The conveying air carries the material to the cyclone separator. After entering the cyclone separator, under the dual action of gravity and centrifugal force, the material and the conveying air are separated in the cyclone separator. The material comes out from the bottom outlet of the cyclone separator and enters the storage silo. The conveying air comes out from the top outlet and enters the conveying pipeline, and then enters the bag filter. After most of the remaining dust is filtered out by the filter bags in the bag filter, the conveying air enters the variable frequency fan again for the next cycle of conveying.

[0009] Preferably, the cyclone separator adopts a two-stage series separation to ensure thorough separation of the conveying air and the material.

[0010] Furthermore, when the set differential pressure (supply air differential pressure sensor - return air differential pressure sensor = 500~1500Pa) is abnormal, if it is below 500Pa, check whether there are leaks in the bag filter and conveying pipeline. After confirming that there are no leaks, continue operation; if it is above 1500Pa, the control module sends a signal to stop the rotating feed valve, check whether there is any blockage in the filter bag and conveying pipeline, clean it in time if there is any blockage, and continue operation after the differential pressure returns to normal; if the differential pressure is above 2000Pa, the safety valve will trip and the variable frequency fan will stop running. Check and eliminate all causes (blockage in the conveying pipeline and bag filter, malfunction of the differential pressure sensor, etc.), and start operation after it returns to normal.

[0011] Furthermore, during normal operation, the control module adjusts the operating frequency of the variable frequency fan according to the differential pressure value (supply air differential pressure sensor - return air differential pressure sensor = 500~1500Pa): when the differential pressure value is greater than 1200Pa, the operating frequency of the variable frequency fan is gradually increased until it operates at full frequency of 50Hz; when the differential pressure value is less than 700Pa, the operating frequency of the variable frequency fan is gradually decreased until it operates at low frequency of 20Hz.

[0012] The beneficial effects of this utility model are: by providing power through a variable frequency fan, the conveying air circulates in the conveying pipeline, transporting materials from the conveying silo to the storage silo. While completing the material conveying, it does not cause pollution to the surrounding environment and minimizes material loss. It solves the pollution impact on the surrounding environment caused by the previous continuous use of outdoor air for material conveying, and also improves the material conveying effect and quality. Attached Figure Description

[0013] Appendix Figure 1 A schematic diagram of the structure of a device for conveying materials using circulating air according to this utility model is shown.

[0014] Explanation of reference numerals in the attached figures:

[0015] 1. Variable frequency fan; 2. Conveying pipeline; 3. Supply air differential pressure sensor; 4. Safety valve; 5. Rotary feeder valve; 6. Conveying hopper; 7. Cyclone separator; 8. Pulse backflushing device; 9. Bag filter; 10. Return air differential pressure sensor; 11. Control module. Detailed Implementation

[0016] Now combined with the appendix Figure 1 The present invention provides a further description of a device for conveying materials using circulating air.

[0017] This utility model discloses a device for conveying materials using circulating air, comprising a variable frequency fan 1, a conveying pipeline 2, a differential air pressure sensor 3, a safety valve 4, and a rotary feed valve 5. The system consists of a conveying hopper 6, a cyclone separator 7, a pulse jet backflushing device 8, a bag filter 9, a return air differential pressure sensor 10, and a control module 11. The outlet of the variable frequency fan 1 is connected to the outlet of the rotary feed valve 5 through the conveying pipe 2. The air differential pressure sensor 3 and the safety valve 4 are installed near the outlet of the variable frequency fan 1 in the conveying pipe 2. The outlet of the conveying hopper 6 is connected to the rotary feed valve 5. The rotary feed valve 5 is connected to the conveying pipe 2 through a pipe. The conveying pipe 2 is then connected to the inlet of the cyclone separator 7. The bottom outlet of the cyclone separator 7 is connected to the storage hopper. The top outlet is connected to the inlet of the bag filter 9 after passing through a two-stage cyclone. The pulse jet backflushing device 8 is installed on the top of the bag filter 9. The outlet of the bag filter 9 is connected to the inlet of the variable frequency fan 1 through a pipe. The return air differential pressure sensor 10 is installed on the inlet pipe of the variable frequency fan 1.

[0018] The working principle of this utility model is as follows: The operating program set by the control module is as follows: During operation, the control module sends a signal to start the variable frequency fan. After the variable frequency fan operates normally, the entire conveying system forms a negative pressure circulation loop. Once the pressure difference (supply air pressure difference sensor - return air pressure difference sensor = 500~1500Pa) is normal, the control module sends a signal to start the rotary feed valve. The material enters the conveying pipeline through the rotary feed valve. The conveying air carries the material to the cyclone separator. After entering the cyclone separator, under the combined action of gravity and centrifugal force, the material and the conveying air separate. The material exits from the bottom of the cyclone separator and enters the storage silo. The conveying air exits from the top outlet and enters the conveying pipeline, then enters the bag filter. After most of the remaining dust is filtered out by the filter bags in the bag filter, the conveying air re-enters the variable frequency fan for the next cycle of conveying.

[0019] This invention utilizes circulating air to transport materials from the conveying silo to the storage silo during the material conveying process. While completing the material conveying, it does not cause pollution to the surrounding environment and minimizes material loss. It solves the problem of environmental pollution caused by the previous continuous outdoor air material conveying, and also improves the material conveying effect and quality.

Claims

1. A device for conveying materials by circulating air, comprising a variable frequency fan (1), a conveying pipeline (2), a supply air pressure difference sensor (3), a safety valve (4), a rotary feeding valve (5), a conveying bin (6), a cyclone separator (7), a pulse backflusher (8), a bag-type dust collector (9), a return air pressure difference sensor (10) and a control module (11), wherein the outlet of the variable frequency fan (1) is connected to the outlet of the rotary feeding valve (5) through the conveying pipeline (2), the supply air pressure difference sensor (3) and the safety valve (4) are installed near the air outlet of the variable frequency fan (1) of the conveying pipeline (2), the discharge port of the conveying bin (6) is connected to the rotary feeding valve (5), the conveying pipeline (2) is connected to the inlet of the cyclone separator (7) after being connected to the rotary feeding valve (5) through a pipeline, the bottom flow port of the cyclone separator (7) is connected to a storage bin, the top flow port is connected to the inlet of the bag-type dust collector (9) after being subjected to secondary cyclone, the pulse backflusher (8) is installed at the top of the bag-type dust collector (9), the outlet of the bag-type dust collector (9) is connected to the inlet of the variable frequency fan (1) through a pipeline, the return air pressure difference sensor (10) is installed on the inlet pipeline of the variable frequency fan (1), and the control module (11) is electrically connected to the variable frequency fan (1), the supply air pressure difference sensor (3), the safety valve (4), the rotary feeding valve (5) and the return air pressure difference sensor (10).

2. The apparatus for transporting material by circulating air according to claim 1, wherein: All the corners of the conveying pipeline (2) are arc-shaped corners, so as to reduce the resistance of conveying air and the abrasion of the pipeline.

3. The apparatus for conveying material with circulating air according to claim 1, wherein: The inner wall of the conveying pipeline (2) is lined with polyurethane (PU), so as to improve the abrasion resistance and corrosion resistance.

Images