Adipic acid powder conveying system and method

Abstract

A adipic acid powder conveying system includes a screw conveyor, the screw conveyor is provided with at least two flexible conveying pipes, a transport vehicle, a feed silo, a cover plate is provided on the top of the feed silo for sealing, the feed silo includes a plurality of inverted conical silos, adjacent silos are connected by an upwardly protruding arc segment, a plurality of feed ports are provided on the cover plate, corresponding to the silos and the arc segment, an air intake line is provided on the air intake line, a plurality of air intake ports are connected to the lower part of the corresponding silo, and the opening and closing are controlled by air intake valves respectively, a discharge line is provided on the discharge line, a plurality of discharge ports are connected to the bottom of the corresponding silo, and the opening and closing are controlled by discharge valves respectively, at least two flexible conveying pipes are detachably connected to the feed port on the cover plate, and the combination constitutes the adipic acid powder conveying system. The present invention has a simple structure and is easy to operate, can quickly and at low cost complete the purpose of conveying adipic acid powder, and ensures conveying efficiency and product quality.

Description

Technical Field

[0001] The present invention relates to the field of chemical industry, and in particular to a system and method for conveying adipic acid powder. Background Art

[0002] The adipic acid liquid synthesized by chemical companies is crystallized into a slurry, which is then centrifuged to produce a wet adipic acid feed with a moisture content of approximately 10%. The wet feed is then heated and dried in a fluidized bed and cooled to produce adipic acid powder. The adipic acid powder produced by the chemical company is then packaged into bags by a packaging machine. Once weighed and qualified, it is stored, palletized, and transported by truck.

[0003] The stacked bags of adipic acid are prone to agglomeration due to extrusion during transportation, resulting in a decrease in product quality. In addition, the packaging and stacking of adipic acid powder also has the disadvantages of high packaging costs and high labor intensity.

[0004] Therefore, how to efficiently and cost-effectively transport adipic acid powder to the outside is a problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0005] One of the purposes of the present invention is to address the deficiencies of the prior art and provide an adipic acid powder conveying system which has a simple structure, is easy to operate, can quickly and at low cost complete the conveying purpose of adipic acid powder, and ensures conveying efficiency and product quality.

[0006] A second object of the present invention is to provide a method for conveying adipic acid powder using the above-mentioned conveying system, which is simple and convenient to operate, can greatly reduce manual labor intensity, and effectively improve the conveying efficiency of adipic acid powder.

[0007] The technical solution for achieving one of the purposes of the present invention is: an adipic acid powder conveying system, comprising a screw feeder, wherein the feed port of the screw feeder is used to be connected to the adipic acid powder source, at least two flexible feed pipes are evenly arranged along the length direction at the bottom of the screw feeder, and the opening and closing are controlled by the discharge valve respectively, and the system also includes a transport vehicle, and a feed bin arranged on the transport vehicle, the top of the feed bin is provided with a cover plate for sealing, the feed bin includes a plurality of inverted conical silos, the plurality of silos are arranged along the length direction of the transport vehicle, and adjacent silos are connected by upward convex The arc surface section of the transport vehicle is connected, and a plurality of feed ports are provided on the cover plate. The plurality of feed ports are spaced apart along the length direction of the transport vehicle, corresponding to the silo and the arc surface section. The cover plate also includes an air intake pipeline, and a plurality of air intake ports are provided on the air intake pipeline and connected to the corresponding lower part of the silo, and the opening and closing are controlled by the air intake valve respectively. The cover plate also includes a discharge pipeline, and a plurality of discharge ports are provided on the discharge pipeline and connected to the corresponding bottom of the silo, and the opening and closing are controlled by the discharge valve respectively. At least two flexible conveying pipes are detachably connected to the feed ports on the cover plate, and the combination constitutes an adipic acid powder conveying system.

[0008] A pressure relief valve and a safety valve are provided at the downstream end of the air intake pipeline.

[0009] It also includes a three-way valve, the first port of which is connected to a source of adipic acid powder, the second port of which is connected to a feed port of a packaging machine, and the third port of which is connected to a feed port of a screw feeder.

[0010] It also includes multiple blow-assisting pipes, the number of which is adapted to the number of silos. The upstream end of each blow-assisting pipe is connected to the air inlet pipe, and the downstream end of each blow-assisting pipe is connected to the discharge pipe, located upstream of the corresponding discharge port, and each blow-assisting pipe is controlled to open and close by a blow-assisting valve.

[0011] It also includes a circulation pipeline, the upstream end of which is connected to the discharge pipeline and is located downstream of the discharge port, and the downstream end of which is connected to the air intake pipeline and is located upstream of the air intake port. The circulation pipeline is opened and closed by a circulation valve.

[0012] The technical solution for achieving the second object of the present invention is: a method for conveying adipic acid powder using the above-mentioned adipic acid powder conveying system comprises the following steps:

[0013] 1) Start the screw feeder;

[0014] 2) Adipic acid powder is fed into the feed bin through at least two flexible feed pipes and the corresponding discharge valves are controlled. The feeding method is:

[0015] Feed materials to the corresponding feed ports of each silo in sequence along the front or rear direction of the vehicle until the height of the adipic acid powder accumulated in each silo exceeds the highest point of the curved surface segment; then feed materials to the corresponding feed ports of each curved surface segment in sequence along the front or rear direction of the vehicle until the height of the adipic acid powder accumulated in each curved surface segment does not exceed the height of the adipic acid powder accumulated in the silo, completing the feeding and sealing each feed port;

[0016] 3) The transport vehicle moves to the destination and uses the air intake pipe and air intake valve to pressurize the feed bin;

[0017] 4) Open the discharge valve corresponding to the silo to discharge the material to the outside;

[0018] 5) Repeat steps 3) and 4) until the discharge is completed.

[0019] Preferably, in step 2), the height of the adipic acid powder accumulated in each silo is 95% of the height between the bottom of the silo and the cover, and the height of the adipic acid powder accumulated on each arc surface segment is 90% of the height between the bottom of the silo and the cover.

[0020] The pressurization in step 3) is performed by using an inert gas.

[0021] The above technical solution has the following beneficial effects:

[0022] 1. An adipic acid powder conveying system includes a screw conveyor, the feed port of which is connected to a source of adipic acid powder. At least two flexible feed pipes are evenly spaced along the bottom of the screw conveyor, each controlled by a discharge valve. Opening or closing the corresponding discharge valve allows the adipic acid powder to be discharged along the corresponding flexible feed pipe. The system also includes a transport vehicle and a feed silo mounted on the vehicle, which can be moved to a designated location by the vehicle. A cover plate seals the top of the feed silo. The feed silo comprises multiple inverted conical silos arranged along the length of the vehicle. Adjacent silos are connected by upwardly protruding curved sections. The spaces between the silos and the cover plate, and between the curved sections and the cover plate, constitute the loading space for the feed silo. The cover plate is provided with multiple feed openings, spaced along the length of the vehicle, corresponding to the silos and the curved sections. In other words, feed openings are provided above both the silos and the curved sections. The invention also includes an air inlet pipeline, on which a plurality of air inlets are provided, connected to the lower part of the corresponding silo, and the opening and closing are controlled by air inlet valves, that is, by controlling the air inlet valve to ventilate the corresponding silo, the internal space of the feed silo is pressurized, and the adipic acid powder in the silo is forced to be discharged by the pressure. At the same time, the gas entering the silo through the air inlet can also fluff the adipic acid powder in the silo and / or form a pulse oscillation of the adipic acid powder on the inner wall of the silo, thereby ensuring the quality of the adipic acid powder and improving the discharge efficiency of the adipic acid powder. The invention also includes a discharge pipeline, on which a plurality of discharge ports are provided, connected to the bottom of the corresponding silo, and the opening and closing are controlled by discharge valves, respectively. By opening the corresponding discharge valve, the fluffed adipic acid powder in the corresponding silo is discharged to the outside through the discharge valve and the discharge pipeline under the action of gas pressure and gravity. The discharge efficiency is high, the discharged adipic acid powder does not agglomerate, the product quality is good, and the labor intensity can be greatly reduced. At least two flexible feed pipes are detachably connected to the feed port on the cover plate to form an adipic acid powder conveying system. Adipic acid powder is fed into the silo from the feed port of the corresponding silo, and an inverted conical material pile is formed on the upper part of the silo. Adipic acid powder is fed into the silo from the feed port of the corresponding arc surface segment to fill the space between the two adjacent material piles, thereby increasing the utilization rate of the loading space of the entire feed silo and improving the conveying efficiency of the adipic acid powder.

[0023] 2. A pressure relief valve and a safety valve are installed at the downstream end of the air inlet pipeline. The safety valve is used to prevent the air pressure in the feed bin from being too high to ensure the safety of the conveying system. The pressure relief valve is used to open and release the pressure after the discharge is completed.

[0024] 3. It also includes a three-way valve, the first port of which is used to be connected to the adipic acid powder source, the second port of which is used to be connected to the feeding port of the packaging machine, and the third port of the three-way valve is connected to the feeding port of the screw feeder. According to actual needs, the conveying system can be selected to transport the adipic acid powder product to the outside, or the adipic acid powder can be sent to the packaging machine for packaging processing to meet the actual needs of the enterprise.

[0025] 4. It also includes multiple blow-assisting pipes, the number of which is adapted to the number of silos. The upstream end of each blow-assisting pipe is connected to the air inlet pipe, and the downstream end of each blow-assisting pipe is connected to the discharge pipe, located upstream of the corresponding discharge port, and each blow-assisting pipe is controlled to open and close by a blow-assisting valve. By opening the blow-assisting valve, high-pressure gas is filled into the discharge pipe section of the discharge, which cooperates with the air pressure in the feed silo to improve the discharge efficiency of the adipic acid powder.

[0026] 5. It also includes a circulation pipeline, the upstream end of which is connected to the discharge pipeline and is located downstream of the discharge port, and the downstream end of which is connected to the air intake pipeline and is located upstream of the air intake port. The circulation pipeline is opened and closed by a circulation valve. According to actual needs, the circulation valve can be opened to allow the high-pressure airflow to return to the air intake pipeline along the circulation valve, thereby improving the utilization efficiency of the high-pressure gas.

[0027] 6. The conveying method of the present invention first uses multiple flexible conveying pipes to convey materials to each silo in turn, and makes the height of the adipic acid powder accumulated in each silo exceed the high point of the curved surface segment, so that the adipic acid powder fills each silo, and the part exceeding the silo is accumulated in an inverted cone shape. Then, multiple flexible conveying pipes are used to convey materials to each curved surface segment in turn, filling the interval space between the adipic acid materials accumulated in adjacent silos, greatly improving the overall loading rate of the conveying silos and improving the conveying efficiency of the transport vehicle. During the transportation process of the transport vehicle loaded with adipic acid powder, the bumpy transportation state is also conducive to preventing the adipic acid powder accumulated in the silo from agglomerating. After the transport vehicle loaded with adipic acid powder arrives at the destination, it first uses the air intake pipeline to pressurize the conveying silo, and during the punching process, the high-pressure gas enters from the bottom of the corresponding silo, which can further fluff up the accumulated adipic acid powder and improve the quality of the adipic acid. After the inflation is completed, the corresponding discharge valve is opened, and the adipic acid powder accumulated in the silo is discharged through the discharge valve under the action of air pressure, thereby completing the transportation purpose of the adipic acid powder. The transportation efficiency is high, the quality of the transported adipic acid powder is good, and the labor intensity can be greatly reduced.

[0028] The following is a further description with reference to the accompanying drawings and specific implementations. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the present invention.

[0030] In the accompanying drawings, 1 is a screw feeder, 2 is a flexible feed pipe, 3 is a discharge valve, 4 is a transport vehicle, 5 is a feed bin, 6 is a cover plate, 7 is a silo, 8 is a curved surface section, 9 is a feed port, 10 is an air inlet pipe, 11 is an air inlet, 12 is an air inlet valve, 13 is a discharge pipe, 14 is a discharge port, 15 is a discharge valve, 16 is a pressure relief valve, 17 is a safety valve, 18 is a three-way valve, 19 is an auxiliary blowing pipe, 20 is an auxiliary blowing valve, 21 is a circulation pipe, and 22 is a circulation valve. DETAILED DESCRIPTION

[0031] Example 1

[0032] See also Figure 1, which is a specific embodiment of an adipic acid powder conveying system. The adipic acid powder conveying system includes a screw conveyor 1, the feed port of the screw conveyor 1 is used to connect to an adipic acid powder source, and at least two flexible conveying pipes 2 are evenly arranged along the length direction at the bottom of the screw conveyor 1, and the opening and closing are controlled by a discharge valve 3 respectively. In this embodiment, the number of flexible conveying pipes is two. Of course, more flexible conveying pipes can also be provided according to actual needs. The system also includes a three-way valve 18, the first port of the three-way valve 18 is used to connect to the adipic acid powder source, the second port of the three-way valve is used to connect to the feed port of a packaging machine, and the third port of the three-way valve is connected to the feed port of the screw conveyor 1. By controlling the communication between the first port and the second port or the communication between the first port and the third port, or closing the three-way valve, the adipic acid powder enters the screw conveyor or enters the packaging machine for packaging into bagged products, thereby meeting the actual needs of the enterprise. The transport vehicle 4 also includes a feed silo 5 mounted on the transport vehicle 4. The feed silo 5 is sealed with a cover plate 6 at the top. The feed silo 5 includes three inverted conical silos 7 arranged along the length of the transport vehicle 4. Adjacent silos 7 are connected by upwardly protruding curved sections 8. Clearly, there is a space between the silo openings and the cover plate. The cover plate 6 is provided with five feed ports 9, spaced apart along the length of the transport vehicle 4 and corresponding to the silos 7 and curved sections 8. It also includes an air intake pipeline 10, on which three groups of air inlets 11 are provided, which are connected to the lower part of the corresponding silo 7, and are respectively opened and closed by air intake valves 12. Specifically, there are two air inlets in a group, both of which are connected to the lower part of the silo. Obviously, the upstream end of the air intake pipeline is connected to the high-pressure gas source. In order to meet actual needs and ensure safety, a pressure relief valve 16 and a safety valve 17 are provided at the downstream end of the air intake pipeline 10. In this embodiment, the downstream end of the air intake pipeline is bifurcated into two paths, one of which is provided with a pressure relief valve, and the other is provided with a safety valve. The discharge pipe 13 also includes three discharge ports 14, which are connected to the bottom of the corresponding silo 7 and are respectively opened and closed by a discharge valve 15. In this embodiment, a plurality of blow-assisting pipes 19 are also included. The number of blow-assisting pipes 19 is adapted to the number of silos 7, that is, the number of blow-assisting pipes is three. The upstream end of each blow-assisting pipe 19 is connected to the air inlet pipe 10, and the downstream end of each blow-assisting pipe 10 is connected to the discharge pipe 13, located upstream of the corresponding discharge port 14, and the opening and closing of each blow-assisting pipe 10 are respectively controlled by an blow-assisting valve 20. In order to improve the utilization rate of high-pressure gas, a circulation pipe 21 is also included. The upstream end of the circulation pipe 21 is connected to the discharge pipe 13, located downstream of the discharge port 14, and the downstream end of the circulation pipe 21 is connected to the air inlet pipe 10, located upstream of the air inlet 11, and the opening and closing of the circulation pipe is controlled by a circulation valve 22. The two flexible conveying pipes 2 are detachably connected to the feed port 9 on the cover plate, and the combination constitutes an adipic acid powder conveying system.

[0033] Example 2

[0034] The method for conveying adipic acid powder using the adipic acid powder conveying system described in Example 1 comprises the following steps:

[0035] 1) Start the screw conveyor and control the first port and the third port of the three-way valve to be connected;

[0036] 2) Adipic acid powder is fed into the feed bin through two flexible feed pipes and the corresponding discharge valves are controlled. The feeding method is as follows:

[0037] Feed materials to the feed ports corresponding to each silo in sequence along the front or rear direction of the vehicle until the height of the adipic acid powder accumulated in each silo exceeds the highest point of the cambered surface segment. Specifically, the height of the adipic acid powder accumulated in each silo is 95% of the height between the bottom of the silo and the cover plate. Then feed materials to the feed ports corresponding to each cambered surface segment in sequence along the front or rear direction of the vehicle until the height of the adipic acid powder accumulated on each cambered surface segment does not exceed the height of the adipic acid powder accumulated in the silo. Specifically, the height of the adipic acid powder accumulated on each cambered surface segment is 90% of the height between the bottom of the silo and the cover plate. After completing the feeding, seal each feed port.

[0038] 3) The transport vehicle is transferred to the destination, and the air intake pipe and air intake valve are used to pressurize the feed silo. Usually, an inert gas such as nitrogen is used for pressurization. During the inflation process, the high-pressure gas has a loosening effect on the adipic acid powder accumulated in each silo;

[0039] 4) Open the discharge valves corresponding to the silos in sequence along the front or rear direction of the vehicle to discharge the material outwards;

[0040] 5) Repeat steps 3) and 4), and open the corresponding blow-down valve according to actual conditions to use high-pressure gas to assist discharge until discharge is completed.

Claims

1. An adipic acid powder conveying system, characterized by: The invention comprises a screw feeder (1), wherein the feed port of the screw feeder (1) is connected to a source of adipic acid powder, and at least two flexible feed pipes (2) are evenly arranged along the length direction at the bottom of the screw feeder (1), and the opening and closing of the two flexible feed pipes are controlled by discharge valves (3). It also includes a transport vehicle (4), and a feed bin (5) arranged on the transport vehicle (4), a cover plate (6) is provided on the top of the feed bin (5) for sealing, the feed bin (5) includes a plurality of inverted conical bins (7), the plurality of bins (7) are arranged along the length direction of the transport vehicle (4), and adjacent bins (7) are connected by upwardly protruding arc segments (8), the cover plate (6) is provided with a plurality of feed ports (9), the plurality of feed ports (9) are spaced apart along the length direction of the transport vehicle (4), and correspond to the bins (7) and the arc segments (8), The air intake pipe (10) is provided with a plurality of air inlets (11) connected to the lower part of the corresponding silo (7), and the opening and closing are controlled by air intake valves (12) respectively. A pressure relief valve (16) and a safety valve (17) are provided at the downstream end of the air intake pipe (10). It also includes a discharge pipeline (13), on which a plurality of discharge ports (14) are provided, connected to the bottom of the corresponding silo (7), and the opening and closing of each port are controlled by a discharge valve (15). It also includes a three-way valve (18), wherein the first port of the three-way valve (18) is connected to a source of adipic acid powder, the second port of the three-way valve is connected to a feed port of a packaging machine, and the third port of the three-way valve is connected to a feed port of a screw feeder (1). At least two flexible material delivery pipes (2) are detachably connected to the material feed port (9) on the cover plate, and the combination forms an adipic acid powder delivery system.

2. The adipic acid powder conveying system according to claim 1, characterized in that: It also includes a plurality of blow-assisting pipes (19), the number of which is adapted to the number of the silos (7), the upstream end of each blow-assisting pipe (19) being connected to the air inlet pipe (10), the downstream end of each blow-assisting pipe (19) being connected to the discharge pipe (13), being located upstream of the corresponding discharge port (14), and each blow-assisting pipe (19) being controlled to open and close by a blow-assisting valve (20).

3. The adipic acid powder conveying system according to claim 1, characterized in that: The apparatus further comprises a circulation pipeline (21), wherein the upstream end of the circulation pipeline (21) is connected to the discharge pipeline (13) and is located downstream of the discharge port (14); the downstream end of the circulation pipeline (21) is connected to the air intake pipeline (10) and is located upstream of the air intake port (11); and the circulation pipeline is controlled to be opened and closed by a circulation valve (22).

4. A method for conveying adipic acid powder using the adipic acid powder conveying system according to any one of claims 1 to 3, characterized in that: The following steps are involved: 1) Start the screw conveyor; 2) Adipic acid powder is fed into the feed bin through at least two flexible feed pipes and the corresponding discharge valves are controlled. The feeding method is: Feed materials to the corresponding feed ports of each silo in sequence along the front or rear direction of the vehicle until the height of the adipic acid powder accumulated in each silo exceeds the highest point of the curved surface segment; then feed materials to the corresponding feed ports of each curved surface segment in sequence along the front or rear direction of the vehicle until the height of the adipic acid powder accumulated in each curved surface segment does not exceed the height of the adipic acid powder accumulated in the silo, completing the feeding and sealing each feed port; 3) The transport vehicle moves to the destination and uses the air intake pipe and air intake valve to pressurize the feed bin; 4) Open the discharge valve corresponding to the silo to discharge the material to the outside; 5) Repeat steps 3) and 4) until the discharge is completed.

5. The method according to claim 4, characterized in that Step 2) The height of the adipic acid powder accumulated in each silo is 95% of the height between the bottom of the silo and the cover, and the height of the adipic acid powder accumulated on each arc surface segment is 90% of the height between the bottom of the silo and the cover.

6. The method according to claim 4, characterized in that The pressurization in step 3) is performed by using an inert gas.

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