A clog-resistant pneumatic ash conveying device

Abstract

This utility model discloses an anti-clogging pneumatic ash conveying device, including a buffer silo, a first screw conveyor at the top of the buffer silo, a silo pump on one side of the first screw conveyor, and an ash hopper at the top of the first screw conveyor. This anti-clogging pneumatic ash conveying device adopts a combined structure of "buffer silo + silo pump". The buffer silo can balance the material supply, reduce the frequency of feeding into the silo pump, and reduce equipment wear. The conveying pipeline adopts a variable diameter design, with the pipe diameter increased in sections according to the conveying distance, reducing the flow velocity inside the pipeline and reducing wear and the risk of pipe blockage. An intelligent anti-clogging system is configured, which monitors the pipeline pressure in real time through a pressure transmitter. When the pressure is abnormal, the auxiliary blowing device is automatically activated to purge, and a negative pressure back-extraction device can be used to clear blockages. The silo pump adopts dual-zone fluidization technology, with the bottom gasification chamber and the middle fluidization ring working together to improve the material fluidization effect and adapt to the conveying of materials with high moisture content.

Description

Technical Field

[0001] This utility model relates to the technical field of ash conveying devices, specifically an anti-clogging pneumatic ash conveying device. Background Technology

[0002] Dilute phase pneumatic conveying consists of air source equipment such as Roots blowers, conveying pipelines, and separators. Its basic principle is to use high-speed airflow, typically 15-30 m / s, to disperse and suspend materials within the pipeline, achieving conveying through airflow propulsion. This technology is suitable for short-distance, low-flow conveying, such as ash conveying in small boiler dust collectors. Dense phase pneumatic conveying uses a silo pump as its core equipment. High-pressure gas, typically 0.2-0.7 MPa, fluidizes the material in the silo and forces it into the conveying pipeline, achieving high-concentration conveying at a lower air velocity, typically 5-15 m / s. Typical processes include bottom-feed silo pump conveying systems, widely used in long-distance, high-flow ash conveying in the steel and power industries.

[0003] However, traditional ash conveying devices have the following drawbacks:

[0004] Traditional dense phase systems rely on manual experience to adjust the blowing valve, resulting in a blockage rate of about 5-8%. Traditional processes typically use ordinary steel elbows with a lifespan of 1-2 years, requiring frequent replacements that impact production. Traditional systems are based on PLC control, with operation dependent on manual intervention, making them impractical. Utility Model Content

[0005] The purpose of this utility model is to provide an anti-clogging pneumatic ash conveying device to solve the problems mentioned in the background art, such as the traditional dense phase system relying on manual experience to adjust the blowing valve, with a blockage rate of about 5-8%, the traditional process generally using ordinary steel elbows with a lifespan of 1-2 years, frequent replacement affecting production, and the traditional system being based on PLC control, with operation relying on manual labor and low practicality.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a pneumatic ash conveying device for preventing blockage, comprising a buffer silo, a first screw conveyor at the top of the buffer silo, a silo pump on one side of the first screw conveyor, an ash hopper at the top of the first screw conveyor, a second screw conveyor at the bottom of the buffer silo, an ash silo on one side of the buffer silo, an air storage tank on the other side of the buffer silo, an air inlet pipe extending into the buffer silo fixedly connected to the outlet of the silo pump, pressure transmitters fixedly installed in the middle of the air inlet pipe and on the surface of the silo pump, and a controller fixedly installed at one end of the buffer silo.

[0007] Preferably, the inlet of the first screw conveyor is fixedly connected to a first feed pipe extending into the ash hopper, and the outlet of the first screw conveyor is fixedly connected to a first discharge pipe extending into the buffer silo. The ash hopper holds impurities in the ash silo, and the material in the ash hopper is transported to the first screw conveyor through the first feed pipe, and then transported to the buffer silo through the first screw conveyor and the first discharge pipe.

[0008] Preferably, the inlet of the second screw conveyor is fixedly connected to a second feed pipe extending into the buffer chamber, and the outlet of the second screw conveyor is fixedly connected to a second discharge pipe extending into the silo pump. The material in the buffer chamber is injected into the second screw conveyor through the second feed pipe, and the material conveyed by the second screw conveyor is transported to the silo pump through the second discharge pipe.

[0009] Preferably, the middle part of the second feeding pipe is fixedly connected to a blowing aid pipe, and the middle part of the blowing aid pipe is fixedly installed with a blowing aid solenoid valve. When the pressure exceeds 1.2 times the set value, the blowing aid valve is opened to inject high-pressure gas into the blowing aid pipe to purge the blocked part.

[0010] Preferably, the inlet of the silo pump is fixedly connected to an air extraction pipe. When the pneumatic feed valve is opened, the material falls from the buffer silo into the silo pump. After the level gauge detects that the material is full, the feed valve is closed. During the fluidization and pressurization stage, high-pressure gas of 0.4-0.6 MPa is introduced into the bottom gasification chamber to fluidize the material, and the pressure inside the silo rises to the set value of 0.2-0.3 MPa. During the conveying stage, the pneumatic discharge valve is opened, and the fluidized material enters the conveying pipe under the action of pressure difference. During the purging stage, after the material is conveyed, the air inlet valve is closed after a delay, and compressed air is used to purge the pipe.

[0011] Preferably, the gas inlet of the gas storage tank is fixedly connected to a main gas delivery pipe, and the gas outlet of the gas storage tank is fixedly connected to a sub-gas delivery pipe. One end of the sub-gas delivery pipe is fixedly connected to the end of the buffer chamber that is directly opposite to it. When the gas in the gas storage tank is insufficient, the main gas delivery pipe injects gas into the gas storage tank, and the gas in the gas storage tank is delivered to the buffer chamber through the sub-gas delivery pipe.

[0012] Preferably, an electric heater is fixedly installed in the middle of the gas delivery tube. When the electric heater is powered on, the heating wire inside the electric heater heats up, thereby heating the gas in the gas delivery tube.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. The system adopts a combination structure of "buffer silo + silo pump". The buffer silo can balance the material supply, reduce the feeding frequency of the silo pump, and reduce equipment wear.

[0015] 2. The conveying pipeline adopts a variable diameter design, with the pipe diameter being increased in sections according to the conveying distance, thereby reducing the flow velocity inside the pipeline and minimizing the risk of wear and blockage;

[0016] 3. Equipped with an intelligent anti-clogging system, which monitors pipeline pressure in real time through a pressure transmitter. When the pressure is abnormal, the auxiliary blowing device is automatically activated to purge, and the blockage can be cleared through a negative pressure back-extraction device.

[0017] 4. The pump adopts dual-zone fluidization technology, with the bottom gasification chamber and the middle fluidization ring working together to improve the fluidization effect of materials and adapt to the conveying of materials with high moisture content. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] In the diagram: 1. Buffer silo; 2. First screw conveyor; 3. Second screw conveyor; 4. Silo pump; 5. Auxiliary blowing solenoid valve; 6. Air storage tank; 7. Electric heater; 8. Ash silo; 9. First feed pipe; 10. First discharge pipe; 11. Ash hopper; 12. Second feed pipe; 13. Second discharge pipe; 14. Air extraction pipe; 15. Air inlet pipe; 16. Sub-pipe for conveying air; 17. Main pipe for conveying air; 18. Pressure transmitter; 19. Auxiliary blowing pipe; 20. Controller. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0021] Please see Figure 1 This utility model provides a pneumatic ash conveying device for preventing blockage, including a buffer bin 1, a first screw conveyor 2 at the top of the buffer bin 1, a bin pump 4 on one side of the first screw conveyor 2, an ash hopper 11 at the top of the first screw conveyor 2, a second screw conveyor 3 at the bottom of the buffer bin 1, an ash silo 8 on one side of the buffer bin 1, an air storage tank 6 on the other side of the buffer bin 1, an air inlet pipe 15 extending into the interior of the buffer bin 1 fixedly connected to the outlet of the bin pump 4, pressure transmitters 18 fixedly installed in the middle of the air inlet pipe 15 and on the surface of the bin pump 4, and a controller 20 fixedly installed at one end of the buffer bin 1.

[0022] The inlet of the first screw conveyor 2 is fixedly connected to a first feed pipe 9 extending into the ash hopper 11, and the outlet of the first screw conveyor 2 is fixedly connected to a first discharge pipe 10 extending into the buffer chamber 1. The ash hopper 11 holds impurities in the ash silo 8. The material in the ash hopper 11 is transported to the first screw conveyor 2 through the first feed pipe 9, and then transported to the buffer chamber 1 through the first screw conveyor 2 and the first discharge pipe 10.

[0023] The inlet of the second screw conveyor 3 is fixedly connected to a second feed pipe 12 extending into the buffer chamber 1, and the outlet of the second screw conveyor 3 is fixedly connected to a second discharge pipe 13 extending into the chamber pump 4. The material in the buffer chamber 1 is injected into the second screw conveyor 3 through the second feed pipe 12, and the material conveyed by the second screw conveyor 3 is conveyed into the chamber pump 4 through the second discharge pipe 13.

[0024] The middle of the second feeding pipe 13 is fixedly connected to the blowing pipe 19, and the middle of the blowing pipe 19 is fixedly installed with the blowing solenoid valve 5. When the pressure exceeds 1.2 times the set value, the blowing valve is opened to inject high-pressure gas into the blowing pipe 19 to purge the blocked parts.

[0025] The inlet of the silo pump 4 is fixedly connected to the air extraction pipe 14. When the pneumatic feed valve is opened, the material falls from the buffer silo 1 into the silo pump 4. After the level gauge detects that the material is full, the feed valve is closed. In the fluidization and pressurization stage, high-pressure gas of 0.4-0.6MPa is introduced into the bottom gasification chamber to fluidize the material and raise the pressure in the silo to the set value of 0.2-0.3MPa. In the conveying stage, the pneumatic discharge valve is opened and the fluidized material enters the conveying pipe under the action of pressure difference. In the purging stage, after the material is conveyed, the air inlet valve is closed after a delay and compressed air is used to clean the pipe.

[0026] The inlet of the gas storage tank 6 is fixedly connected to the gas delivery main pipe 17, and the outlet of the gas storage tank 6 is fixedly connected to the gas delivery sub-pipe 16. One end of the gas delivery sub-pipe 16 is fixedly connected to the end of the buffer chamber 1 that is directly opposite to it. When the gas in the gas storage tank 6 is insufficient, the gas delivery main pipe 17 injects gas into the gas storage tank 6, and the gas in the gas storage tank 6 is delivered to the buffer chamber 1 through the gas delivery sub-pipe 16.

[0027] An electric heater 7 is fixedly installed in the middle of the gas delivery tube 16. When the electric heater 7 is powered on, the heating wire inside the electric heater 7 heats up and heats the gas inside the gas delivery tube 16.

[0028] In this embodiment, the buffer bin 1 temporarily stores materials with a volume of 0.5-1 m³. A radio frequency admittance level gauge is installed at the top for automatic level monitoring. It features a conical bottom design with a 60° inclination angle to prevent material accumulation. A fluidizing device is installed at the bottom, introducing low-pressure gas (0.1-0.2 MPa) to prevent material caking. The bin pump 4 is the core conveying equipment, with a volume designed according to the conveying capacity, such as 0.5-3 m³. It is made of Q235-B carbon steel with a wall thickness of 10-16 mm, and features a pneumatic feed valve. Material falls from buffer silo 1 into silo pump 4. After the level gauge detects that the material is full, the feed valve is closed. In the fluidization and pressurization stage, high-pressure gas of 0.4-0.6MPa is introduced into the bottom gasification chamber to fluidize the material, and the pressure inside the silo rises to the set value of 0.2-0.3MPa. In the conveying stage, the pneumatic discharge valve is opened, and the fluidized material enters the conveying pipeline under the action of pressure difference. In the purging stage, after the material is conveyed, the air inlet valve is closed after a delay, and compressed air is used to purge the pipeline. The conveying pipeline conveys the material and uses 20# thick-walled seamless steel pipe with a wall thickness ≥10mm. The elbows are ceramic wear-resistant elbows with an Al2O3 content ≥95% and a bending radius R=10D. Due to the low conveying velocity of the system, this system uses thickened ordinary seamless steel pipe as the conveying pipeline. The elbows can be back-thickened seamless steel pipe elbows or steel-ceramic composite wear-resistant elbows with a bending radius of not less than 0.7 meters. One conveying pipe is used for one silo pump in one electric field. The pipeline adopts a variable diameter design with specifications ranging from ￠114×7 to ￠133×8. The two pumps in the second and third electric fields share a single delivery pipe, which also adopts a variable diameter design with specifications ranging from ￠114×7 to ￠133×8. The pipeline is designed with thermal expansion in mind, adopting a flexible piping system design principle and making full use of bends for compensation. A blow-blocking device is installed every 20 to 30 meters along the pipeline to meet the blow-blocking requirements in case of system failure and pipe blockage. When the pressure exceeds 1.2 times the set value, the blow-blocking valve is opened to inject high-pressure gas into the blow-blocking pipeline 19 to purge the blocked area.

[0029] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An anti-choking pneumatic ash conveying device comprising a buffer bin (1), characterized in that: The buffer chamber (1) is provided with a first screw conveyor (2) at the top, a chamber pump (4) is provided on one side of the first screw conveyor (2), an ash hopper (11) is provided at the top of the first screw conveyor (2), a second screw conveyor (3) is provided at the bottom of the buffer chamber (1), an ash silo (8) is provided on one side of the buffer chamber (1), an air storage tank (6) is provided on the other side of the buffer chamber (1), the outlet of the chamber pump (4) is fixedly connected to an air inlet pipe (15) extending into the interior of the buffer chamber (1), a pressure transmitter (18) is fixedly installed in the middle of the air inlet pipe (15) and on the surface of the chamber pump (4), and a controller (20) is fixedly installed at one end of the buffer chamber (1).

2. The anti-blocking pneumatic ash conveying device according to claim 1, characterized in that: The inlet of the first screw conveyor (2) is fixedly connected to a first feed pipe (9) extending into the ash hopper (11), and the outlet of the first screw conveyor (2) is fixedly connected to a first discharge pipe (10) extending into the buffer bin (1).

3. The anti-blocking pneumatic ash conveying device according to claim 1, characterized in that: The inlet of the second screw conveyor (3) is fixedly connected to a second feed pipe (12) extending into the buffer silo (1), and the outlet of the second screw conveyor (3) is fixedly connected to a second discharge pipe (13) extending into the silo pump (4).

4. The anti-blocking pneumatic ash conveying device according to claim 3, characterized in that: The middle part of the second feeding pipe (13) is fixedly connected to the blowing pipe (19), and the middle part of the blowing pipe (19) is fixedly installed with the blowing solenoid valve (5).

5. The anti-blocking pneumatic ash conveying device according to claim 1, characterized in that: The inlet of the silo pump (4) is fixedly connected to an air extraction pipe (14).

6. The anti-blocking pneumatic ash conveying device according to claim 1, characterized in that: The gas storage tank (6) has a fixed connection between its inlet and a main gas delivery pipe (17), and a fixed connection between its outlet and a sub-gas delivery pipe (16). One end of the sub-gas delivery pipe (16) is fixedly connected to the end of the buffer chamber (1) that is directly opposite to it.

7. A device for preventing air lock in a pneumatic ash conveying system according to claim 6, characterized in that An electric heater (7) is fixedly installed in the middle of the gas delivery tube (16).

Images