Carbon black dust anti-blocking conveying system and conveying method

Abstract

The invention relates to the technical field of carbon black processing equipment, in particular to a carbon black dust anti-blocking conveying system which comprises a positive pressure conveying unit, a feeding unit and a negative pressure conveying unit which are connected to a conveying pipeline. The output end of the negative pressure conveying unit is connected with a collecting unit; wherein the positive pressure conveying unit comprises a positive pressure fan connected to the conveying pipeline, the positive pressure fan is connected to the front end of the feeding unit, the positive pressure conveying unit is arranged on the conveying pipeline, air can be forcibly supplied to the pneumatic conveying pipeline, under the normal working condition, micro-negative pressure is kept at an outlet of the positive pressure fan, and the positive pressure fan is connected to the feeding unit. Once the conveying pipe is partially blocked, the positive pressure fan works, the outlet pressure of the positive pressure fan is increased, the powdery carbon black at the blocked part is pushed to flow by positive pressure, so that the normal working condition is recovered, and secondly, the carbon black dust collected by the exhaust bag filter is relatively high in moisture content and is easy to cause blockage, so that the position of the carbon black dust is adjusted to the tail end of the conveying pipe.

Description

Technical Field

[0001] The invention relates to the technical field of carbon black processing equipment, and in particular to a carbon black dust blocking prevention conveying system and a conveying method. Background Art

[0002] In the carbon black production process, carbon black dust needs to be transported to the granulation unit over a long distance after being collected by the bag filter. Carbon black is an amorphous body with a microscopic particle size between 10 and 100 nm, and its macroscopic properties mainly depend on the morphological structure of the aggregate. The new non-jacketed five-stage carbon black reactor can produce 7 to 10 types of carbon black. Each type of carbon black has a different structure and critical settling velocity, so the conveying air volume and pressure regulation system need to match the production capacity of the reactor.

[0003] In order to prevent carbon black from leaking and drifting, the pneumatic conveying system adopts negative pressure dilute phase conveying to maintain a slight negative pressure state in the conveying pipeline. In this conveying method, the solid content is less than 10kg / m³, the flow rate is greater than 30m / s, and the carbon black dust is dispersed and suspended in the airflow, and is transported by the negative pressure of the airflow.

[0004] However, there are some problems with the existing carbon black pneumatic conveying system. First, the system is not equipped with a positive pressure air blower. Once any point in the pipeline path is blocked, the conveying air volume will be reduced. Even if the regulating valve of the conveying air volume control system is fully opened, it cannot provide sufficient pneumatic conveying air volume, thus causing system blockage; second, the powdered carbon black collected by the bag filter first enters the negative pressure section of the pneumatic conveying pipeline, and then enters the positive pressure section through the negative pressure air blower. The micron crusher is set in the positive pressure section, which is also easy to cause system blockage. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art that the system is not equipped with a positive pressure air blower, which easily causes system blockage, and proposes a carbon black dust anti-blocking conveying system and conveying method.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: Design a carbon black dust anti-blocking conveying system, including: A positive pressure conveying unit, a feeding unit and a negative pressure conveying unit connected to the conveying pipeline; A collecting unit is connected to the output end of the negative pressure delivery unit; The positive pressure delivery unit comprises a positive pressure fan connected to the delivery pipeline, the positive pressure fan is connected to the front end of the feeding unit, and a positive pressure regulating mechanism is arranged at the input end of the positive pressure fan.

[0007] Further, the positive pressure regulating mechanism includes an air supply pipe connected to the input end of the positive pressure fan; An electric control valve and a flow transmitter are fixedly connected to the air supply pipe, and an air filter is also connected to the front end of the air supply pipe.

[0008] Furthermore, the air supply pipe is connected to a recovery funnel, and the air supply pipe is connected to an air supply port via a valve.

[0009] Further, the feeding unit includes a main bag filter A, a main bag filter B, a reprocessing bag filter and an exhaust bag filter which are sequentially connected to the conveying pipeline; The exhaust bag filter is located on a side close to the negative pressure delivery unit.

[0010] Furthermore, the negative pressure delivery unit includes a negative pressure fan connected to the tail end of the delivery pipeline, the delivery pipeline is located at the front end of the negative pressure fan and is connected to a regulating valve, and the output end of the negative pressure fan is connected to the front end of the collection unit.

[0011] Furthermore, the collection unit includes a collection bag filter connected to the negative pressure fan, the output end of the collection bag filter is connected to an output pipe and at least one branch pipe, the output end of the branch pipe is connected to a micron grinder, and the output pipe and the output end of the micron grinder are connected to a storage tank.

[0012] Furthermore, a stirring mechanism is installed in the storage tank, and a pressure balancing pipe is connected between the storage tank and the collection bag filter.

[0013] Furthermore, the delivery pipeline is connected to a plurality of pressure sensors and at least one temperature measuring element, and the pressure sensor and the temperature measuring element are electrically connected to a pressure indicator and a temperature indicator, respectively.

[0014] Furthermore, the bending radius of the conveying pipeline is R=.

[0015] In addition, the present invention also proposes a method for preventing carbon black dust from being blocked and conveyed, using the above-mentioned system. Specifically, the conveying method comprises the following steps: The negative pressure conveying unit generates negative pressure to convey the raw materials of the feeding unit to the collecting unit via the conveying pipeline; When the conveying pipeline is partially blocked, causing the flux to decrease, the outlet pressure of the positive pressure conveying unit will gradually increase, and the positive pressure of the airflow will push the powdered carbon black at the blocked point to flow until normal operating conditions are restored.

[0016] The present invention proposes a carbon black dust anti-blocking conveying system and conveying method, which have the beneficial effects that: in the present invention, by arranging a positive pressure conveying unit on the conveying pipeline, forced air supply can be achieved for the pneumatic conveying pipeline. Under normal working conditions, a slight negative pressure is maintained at the outlet of the positive pressure fan. Once the conveying pipe is partially blocked, the positive pressure fan works, and its outlet pressure increases, and the positive pressure is used to push the powdered carbon black at the blocked location to flow, thereby restoring normal working conditions. Secondly, since the carbon black dust collected by the exhaust bag filter has a high moisture content and is prone to blockage, its position is adjusted to the very end of the conveying pipeline, where the airflow driving force is the largest and blockage can be effectively avoided. In addition, the negative pressure fan is arranged at the end of the pneumatic conveying system, which shortens the length of the negative pressure fan outlet pipeline, allowing the carbon black to smoothly enter the collection unit and reduce blockage. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the system structure of the present invention; Figure 2 It is a structural schematic diagram of the positive pressure delivery unit of the present invention; Figure 3 It is a schematic diagram of the structure of the negative pressure delivery unit of the present invention.

[0018] In the figure: 1. conveying pipeline; 11. pressure sensor; 12. temperature measuring element; 13. pressure indicator; 14. temperature indicator; 2. positive pressure conveying unit; 21. positive pressure fan; 22. positive pressure regulating mechanism; 221. air supply pipe; 222. electric control valve; 223. air filter; 224. funnel; 225. valve; 226. air supply port; 227. flow transmitter; 3. feeding unit; 31. main bag filter A; 32. main bag filter B; 33. reprocessing bag filter; 34. exhaust bag filter; 4. negative pressure conveying unit; 41. negative pressure fan; 42. regulating valve; 5. collecting unit; 51. collecting bag filter; 52. output pipe; 53. branch pipe; 54. micron grinder; 55. storage tank; 56. stirring mechanism; 57. pressure balance pipe. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0020] Reference Figure 1-3 An embodiment of the present invention discloses a carbon black dust anti-blocking conveying system, which is used to solve the problem that the current pneumatic conveying system is not equipped with a positive pressure air blower, and any blockage in the pneumatic conveying pipeline path will cause the pneumatic conveying air volume to decrease, causing the carbon black pneumatic conveying system to be blocked. Specifically, the system includes: The positive pressure conveying unit 2, the feeding unit 3 and the negative pressure conveying unit 4 connected to the conveying pipeline 1, the conveying pipeline 1 described in this embodiment is a bent structure, wherein the bending radius of the bending part of the conveying pipeline 1 is R=2000, and by adopting a large radius elbow of R=2000, the elbow resistance is reduced, the pressure drop is reduced, and the deposition of carbon black dust at the elbow is avoided; A collecting unit 5 is connected to the output end of the negative pressure delivery unit 4, and the collecting unit 5 is used to collect the delivered carbon black; The positive pressure delivery unit 2 comprises a positive pressure fan 21 connected to the delivery pipeline 1 . The positive pressure fan 21 is connected to the front end of the feeding unit 3 . A positive pressure regulating mechanism 22 is provided at the input end of the positive pressure fan 21 .

[0021] In some embodiments, the positive pressure regulating mechanism 22 of the present invention includes an air supply pipe 221 connected to the input end of the positive pressure fan 21; An electric control valve 222 and a flow transmitter 227 are fixedly connected to the air supply pipe 221, and an air filter 223 is also connected to the front end of the air supply pipe 221. Of course, the electric control valve 222 and the flow transmitter 227 described in the present invention are electrically connected to an external control unit. The electric control valve 222 is used to open and close the entire air supply pipe 221, and the flow transmitter 227 is referred to as a flow meter, which can be used to increase the amount of incoming air flow to facilitate the subsequent viewing of data during positive pressure regulation. The pneumatic conveying air volume is adjusted by the opening of the electric control valve 222 to ensure that the carbon black solid content of the pneumatically conveyed fluid is less than 10kg / m3.

[0022] On the basis of the above-mentioned embodiment, the air supply pipe 221 in the present invention is also connected to a recovery funnel 224, and the air supply pipe 221 is connected to an air supply port 226 through a valve 225. The recovery funnel 224 is used to accommodate the recovered carbon black. After the recovered carbon black is added to the recovery funnel 224, when the positive pressure is adjusted, the carbon black in the recovery funnel 224 can be transported to the conveying pipeline 1 again, so as to facilitate the subsequent collection unit 5, thereby improving the operational convenience during carbon black transportation and the re-transportation of the recovered carbon black. Of course, the recovery funnel 224 described in the present invention is installed at the front end of the positive pressure fan 21, and negative pressure is generated at this position when the positive pressure fan 21 is working, so as to bring the carbon black in the recovery funnel 224 into the conveying pipeline 1.

[0023] In summary, the present invention provides a positive pressure fan 21 to quantitatively force air supply to the pneumatic conveying pipeline 1. Under normal operating conditions, the pressure at the outlet of the positive pressure fan 21 is slightly negative. When the conveying pipeline 1 is partially blocked and the flux is reduced, the positive pressure fan 21 works, and its outlet pressure will gradually increase, and the positive pressure of the airflow will push the powdered carbon black at the blocked part to flow until the normal operating condition is restored.

[0024] Further, in the embodiment of the present invention, the feeding unit 3 includes a main bag filter A31, a main bag filter B32, a reprocessing bag filter 33 and an exhaust bag filter 34 which are sequentially connected to the conveying pipeline 1; The exhaust bag filter 34 is located on a side close to the negative pressure delivery unit 4 .

[0025] Specifically, since the carbon black dust collected by the exhaust bag filter 34 has a high moisture content and is prone to blockage, the discharge port of the exhaust bag filter 34 is adjusted to the end, where the airflow driving force is the largest, and blockage can be avoided to the greatest extent. Of course, it should be noted that in the present invention, airtight valves are provided at the outlets of the main bag filter A31, the main bag filter B32, the reprocessing bag filter 33 and the exhaust bag filter 34 to control the opening and closing of the discharge port.

[0026] In some embodiments, the negative pressure conveying unit 4 in the present invention includes a negative pressure fan 41 connected to the tail end of the conveying pipeline 1, and the conveying pipeline 1 is connected to a regulating valve 42 at the front end of the negative pressure fan 41, and the regulating valve 42 is used to adjust the negative pressure generated by the negative pressure fan 41 on the conveying pipeline 1. Specifically, when the regulating valve 42 is fully open, the negative pressure of the entire conveying pipeline 1 is the largest, and when the regulating valve 42 is closed, the negative pressure of the entire conveying pipeline 1 is closed, so as to ensure that the pressure at the farthest end of the pneumatic conveying pipeline is a slight negative pressure. The output end of the negative pressure fan 41 is connected to the front end of the collecting unit 5. That is to say, in the present invention, the negative pressure fan 41 is arranged at the end of the pneumatic conveying system to shorten the length of the outlet pipe of the negative pressure fan 41 as much as possible, so that the carbon black can smoothly enter the collecting unit 5 to avoid blockage.

[0027] Based on the above embodiment, the collection unit 5 in the present invention includes a collection bag filter 51 connected to the negative pressure fan 41, and the output end of the collection bag filter 51 is connected to an output pipe 52 and at least one branch pipe 53, the output end of the branch pipe 53 is connected to a micron grinder 54, and the output pipe 52 and the output end of the micron grinder 54 are connected to a storage tank 55.

[0028] Specifically, the micron pulverizer 54 described in the present invention is provided with two. The design of two micron pulverizers 54 can greatly improve the efficiency of carbon black pulverization and transportation. In addition, the micron pulverizer 54 is removed from the pneumatic conveying pipeline path in the present invention, and is directly set at the outlet of the collecting bag filter 51 to reduce equipment resistance, reduce pressure drop, and avoid carbon black dust deposition in the micron pulverizer. Of course, in the present invention, manual valves can also be set at the outlet ends of the collecting bag filter 51 and the micron pulverizer 54 to achieve on-off control of the discharge of each device.

[0029] In a preferred embodiment, a stirring mechanism 56 is installed in the storage tank 55 of the present invention, and the stirring mechanism 56 includes a motor and a stirring rod, and a pressure balance pipe 57 is also connected between the storage tank 55 and the collection bag filter 51. The pressure balance pipe 57 is arranged to ensure that the internal pressures of the collection bag filter 51 and the pressure balance pipe 57 are the same, thereby ensuring that the carbon black can smoothly enter the storage tank 55.

[0030] It should be noted that in order to realize pressure detection at each connection position on the conveying pipeline 1 in the present invention, a plurality of pressure sensors 11 and at least one temperature measuring element 12 are connected to the conveying pipeline 1 in the present invention. The pressure sensor 11 and the temperature measuring element 12 are electrically connected to a pressure indicator 13 and a temperature indicator 14, respectively. The temperature measuring element 12 can be set as a temperature sensor. The set temperature sensor can be used to detect the temperature inside the conveying pipeline 1. Of course, the pressure indicator 13 and the temperature indicator 14 are respectively used to display the pressure value and the temperature value inside the pipeline, thereby improving the convenience of viewing the above data.

[0031] In addition, the present invention also proposes a carbon black dust anti-blocking conveying method, which uses the above-mentioned system. The specific conveying method includes the following steps: The negative pressure conveying unit 4 generates negative pressure to convey the raw materials of the feeding unit 3 to the collecting unit 5 via the conveying pipeline 1; When the conveying pipeline 1 is partially blocked and the flux is reduced, the outlet pressure of the positive pressure conveying unit 2 will gradually increase, and the positive pressure of the airflow will push the powdered carbon black at the blocked part to flow until the normal working condition is restored.

[0032] In summary, in the present invention, by arranging a positive pressure conveying unit 2 on the conveying pipeline, forced air supply can be achieved for the pneumatic conveying pipeline. Under normal working conditions, a slight negative pressure is maintained at the outlet of the positive pressure fan 21. Once the conveying pipe 1 is partially blocked, the positive pressure fan works, and its outlet pressure increases, and the positive pressure is used to push the powdered carbon black at the blocked location to flow, thereby restoring normal working conditions. Secondly, since the carbon black dust collected by the exhaust bag filter 34 has a high moisture content and is prone to blockage, its position is adjusted to the very end of the conveying pipeline 1, where the airflow driving force is the largest, and blockage can be effectively avoided. In addition, the negative pressure fan 41 is arranged at the end of the pneumatic conveying system, which shortens the length of the outlet pipeline of the negative pressure fan 41, so that the carbon black can smoothly enter the collection unit 5 and reduce blockage.

[0033] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A carbon black dust anti-blocking conveying system, characterized in that: include: A positive pressure conveying unit (2), a feeding unit (3) and a negative pressure conveying unit (4) connected to the conveying pipeline (1); A collecting unit (5) is connected to the output end of the negative pressure delivery unit (4); The positive pressure delivery unit (2) comprises a positive pressure fan (21) connected to the delivery pipeline (1), the positive pressure fan (21) is connected to the front end of the feeding unit (3), and a positive pressure regulating mechanism (22) is provided at the input end of the positive pressure fan (21).

2. A carbon black dust anti-blocking conveying system according to claim 1, characterized in that: The positive pressure regulating mechanism (22) comprises an air supply pipe (221) connected to the input end of the positive pressure fan (21); An electric control valve (222) and a flow transmitter (227) are fixedly connected to the air supply pipe (221), and an air filter (223) is also connected to the front end of the air supply pipe (221).

3. A carbon black dust anti-blocking conveying system according to claim 2, characterized in that: The air supply pipe (221) is also connected to a recovery funnel (224), and the air supply pipe (221) is connected to an air supply port (226) via a valve (225).

4. The carbon black dust anti-blocking conveying system according to claim 1 is characterized in that: The feeding unit (3) comprises a main bag filter A (31), a main bag filter B (32), a reprocessing bag filter (33) and an exhaust bag filter (34) which are sequentially connected to the conveying pipeline (1); The exhaust bag filter (34) is located on a side close to the negative pressure delivery unit (4).

5. The carbon black dust anti-blocking conveying system according to claim 1 is characterized in that: The negative pressure delivery unit (4) comprises a negative pressure fan (41) connected to the rear end of the delivery pipeline (1); the delivery pipeline (1) is connected to a regulating valve (42) at the front end of the negative pressure fan (41); and the output end of the negative pressure fan (41) is connected to the front end of the collection unit (5).

6. A carbon black dust anti-blocking conveying system according to claim 5, characterized in that: The collection unit (5) comprises a collection bag filter (51) connected to the negative pressure fan (41); an output end of the collection bag filter (51) is connected to an output pipe (52) and at least one branch pipe (53); the output end of the branch pipe (53) is connected to a micron grinder (54); the output pipe (52) and the output end of the micron grinder (54) are connected to a storage tank (55).

7. A carbon black dust anti-blocking conveying system according to claim 6, characterized in that: A stirring mechanism (56) is installed in the storage tank (55), and a pressure balancing pipe (57) is connected between the storage tank (55) and the collection bag filter (51).

8. A carbon black dust anti-blocking conveying system according to any one of claims 1 to 7, characterized in that: The delivery pipeline (1) is connected to a plurality of pressure sensors (11) and at least one temperature measuring element (12); the pressure sensors (11) and the temperature measuring element (12) are electrically connected to a pressure indicator (13) and a temperature indicator (14), respectively.

9. A carbon black dust anti-blocking conveying system according to any one of claims 1 to 7, characterized in that: The bending radius of the conveying pipeline (1) is R=2000.

10. A method for preventing carbon black dust from being blocked and conveyed, using the system as claimed in any one of claims 1 to 9, characterized in that: The conveying method comprises the following steps: The negative pressure conveying unit (4) generates negative pressure to convey the raw materials of the feeding unit (3) to the collecting unit (5) via the conveying pipeline (1); When the conveying pipeline (1) is partially blocked, causing the flux to decrease, the outlet pressure of the positive pressure conveying unit (2) will gradually increase, and the positive pressure of the airflow will push the powdered carbon black at the blocked part to flow until the normal working condition is restored.

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