A pneumatic delivery system for urea
The pneumatic conveying system solves the problems of manpower consumption and safety in traditional urea feeding methods, and achieves efficient and reliable urea conveying and management.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHONGQING JIANFENG CHEM
- Filing Date
- 2025-05-22
- Publication Date
- 2026-06-09
AI Technical Summary
Traditional urea feeding methods are labor-intensive, have a low safety factor, and pose a risk of ammonia leakage, which can affect the health of operators.
A pneumatic conveying system is adopted, including an air storage tank, an air delivery pipe, a silo pump, a fluidized bed, and a receiving silo. The urea material is fluidized by compressed air to achieve closed conveying and automated control.
It improves conveying efficiency, reduces pipeline wear, ensures material purity, ensures reliable system operation, provides flexible operation and management, and reduces manpower requirements and safety risks.
Smart Images
Figure CN224336657U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of urea delivery technology, and more specifically, to a urea pneumatic delivery system. Background Technology
[0002] In the two-step process for producing dimethyl carbonate from urea, the propylene carbonate synthesis and distillation steps use urea and 1,2-propanediol as raw materials to synthesize industrial-grade propylene carbonate under the action of a catalyst. The traditional method for feeding ton-bag granular urea is by electric hoist. This method is outdated because it requires at least four operators per shift, resulting in high manpower costs and labor intensity. Furthermore, it has a low safety factor and an unfriendly working environment. This is mainly because the existing feeding method allows ammonia gas to escape when urea dissolves in the premixing tank. Since the catalyst is added half an hour after the urea dissolves, there is a possibility of ammonia gas escaping when the feeding port is opened manually. If a leak occurs, workers at heights are at risk of ammonia poisoning. Utility Model Content
[0003] The purpose of this utility model is to provide a urea pneumatic conveying system, which uses pneumatic conveying to transport urea, with high conveying efficiency, reliable system operation, and flexible and convenient operation and management.
[0004] The embodiments of this utility model are achieved through the following technical solutions:
[0005] A pneumatic conveying system for urea includes a conveying system, a feeding system, and a premixing system connected in sequence.
[0006] The feeding system includes a first hopper pump and a first feed hopper disposed on the top of the first hopper pump. A first air inlet is disposed on one side of the lower part of the first hopper pump, and a first discharge outlet is disposed on the other side.
[0007] The conveying system includes a gas storage tank and a gas delivery pipe connected to the gas storage tank, and the end of the gas delivery pipe is connected to the first air inlet of the first chamber pump.
[0008] The premixing system includes several receiving bins, each with a material inlet at the top and a material outlet at the bottom; the first discharge port of the first bin pump is connected to the material inlet of the receiving bin via a first conveying pipe.
[0009] Furthermore, a gasification chamber is provided at the bottom of the first chamber pump, and a fluidized bed is provided in the gasification chamber, which is located below the air inlet and air outlet.
[0010] Furthermore, the bottom of the vaporization chamber is connected to a compressed air pipe, which is connected to an external compressed air supply device or an air storage tank.
[0011] Furthermore, the first feed hopper has a funnel-shaped structure.
[0012] Furthermore, the feeding system also includes a second hopper pump and a second feed hopper disposed on the top of the second hopper pump. A second air inlet is disposed on one side of the lower part of the second hopper pump, and a second discharge outlet is disposed on the other side. The second discharge outlet is connected to the material inlet of the receiving hopper through a second conveying pipe.
[0013] The gas storage tank has two gas supply branch pipes connected to its gas supply pipe end. The two gas supply branch pipes are respectively connected to the first air inlet of the first chamber pump and the second air inlet of the second chamber pump.
[0014] Furthermore, a first feed valve is provided between the top of the first hopper pump and the first feed hopper, and a second feed valve is provided between the top of the second hopper pump and the second feed hopper. A level gauge and a pressure detector are provided in the upper part of both the first and second hopper pumps. The level gauge, the first feed valve, the second feed valve, the first air inlet, the first discharge outlet, the second air inlet, the second discharge outlet, and the pressure detector are all electrically connected to an external control system.
[0015] Furthermore, multiple receiving hoppers are provided, and multiple conveying branch pipes are respectively provided at the ends of the first conveying pipe and the second conveying pipe, which are connected to the multiple receiving hoppers.
[0016] Furthermore, the top of the receiving hopper is equipped with an exhaust pipe and a dust collector.
[0017] The technical solution of this utility model embodiment has at least the following advantages and beneficial effects:
[0018] This utility model conveying system features a low material flow rate, minimal wear on pipelines, and high conveying efficiency. Furthermore, the silo pump is small in size and lightweight, making installation and maintenance simple. The pneumatic conveying method utilizes a closed conveying system within the pipeline, ensuring that impurities cannot mix into the material, thus guaranteeing reliable system operation. Moreover, the system boasts a high degree of automation, controlled by a PLC system. Operation is simple, with dynamic display of operating status, fault alarms, and a sensitive response. It offers comprehensive processing functions, including remote and manual operation, making operation and management flexible, convenient, and reliable. Attached Figure Description
[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0020] Figure 1A schematic diagram of the urea pneumatic conveying system provided in an embodiment of this utility model;
[0021] Figure 2 A schematic diagram of the structure of the first chamber pump provided in an embodiment of this utility model;
[0022] Figure 3 This is a schematic diagram of the structure of the second chamber pump provided in an embodiment of the present utility model;
[0023] Figure 4 This is a schematic diagram of the receiving bin provided in an embodiment of the present utility model.
[0024] Icons: 1-Conveying system, 11-Air storage tank, 12-Air delivery pipe, 121-Air delivery branch pipe, 2-Feeding system, 21-First feed hopper, 22-First silo pump, 23-First feed valve, 24-First air inlet, 25-First discharge outlet, 251-First conveying pipeline, 26-Gasification chamber, 261-Compressed air pipe, 27-Second feed hopper, 28-Second silo pump, 29-Second feed valve, 210-Second air inlet, 211-Second discharge outlet, 2111-Second conveying pipeline, 3-Premixing system, 31-Receiving silo, 32-Dust collector, 33-Material inlet, 34-Emission pipe, 35-Material outlet. Detailed Implementation
[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0026] Example 1
[0027] A pneumatic conveying system for urea includes a conveying system 1, a feeding system 2, and a premixing system 3 connected in sequence.
[0028] The feeding system 2 includes a first hopper pump 22 and a first feed hopper 21 disposed on the top of the first hopper pump 22. A first air inlet 24 is disposed on one side of the lower part of the first hopper pump 22 and a first discharge outlet 25 is disposed on the other side.
[0029] The conveying system 1 includes an air storage tank 11 and an air delivery pipe 12 connected to the air storage tank 11. The end of the air delivery pipe 12 is connected to the first air inlet 24 of the first chamber pump 22.
[0030] The premixing system 3 includes several receiving bins 31, each receiving bin 31 having a material inlet 33 at the top and a material outlet 35 at the bottom; the first discharge port 25 of the first bin pump 22 is connected to the material inlet 33 of the receiving bin 31 through a first conveying pipe 251.
[0031] In this embodiment, a vaporization chamber 26 is also provided at the bottom of the first chamber pump 22. A fluidized bed is provided in the vaporization chamber 26. The fluidized bed is located below the air inlet and air outlet. In this way, compressed air enters from the vaporization chamber 26 at the bottom, diffuses and passes through the fluidized bed to fluidize the urea material. At the same time as the material is fluidized, the medium entering the first conveying pipe 251 is subjected to secondary fluidization and conveying, which ensures the stability and high efficiency of urea conveying.
[0032] In this embodiment, the bottom of the vaporization chamber 26 is connected to a compressed air pipe 261, which is connected to an external compressed air supply device or an air storage tank 11 to ensure a normal supply of compressed air.
[0033] In this embodiment, the first feed hopper 21 has a funnel-shaped structure, which can supply urea more efficiently and ensure the stability of the feeding.
[0034] In this embodiment, the feeding system 2 further includes a second hopper pump 28 and a second feed hopper 27 disposed on the top of the second hopper pump 28. A second air inlet 210 is disposed on one side of the lower part of the second hopper pump 28, and a second discharge outlet 211 is disposed on the other side. The second discharge outlet 211 is connected to the material inlet 33 of the receiving hopper 31 through a second conveying pipe 2111.
[0035] The gas supply pipe 12 of the gas storage tank 11 is connected to two gas supply branch pipes 121. The two gas supply branch pipes 121 are respectively connected to the first air inlet 24 of the first chamber pump 22 and the second air inlet 210 of the second chamber pump 28; and each of the first air inlet 24 and the second air inlet 210 is provided with an air inlet valve.
[0036] Before urea transportation, the second silo pump 28 is used to pre-purge the entire transportation system 1 and pipelines, including the first silo pump 22, the first discharge port 25, the first transportation pipeline 251, and the receiving silo 31, to prevent residual impurities or dust, thus ensuring the normal supply and transportation of urea. In addition, if there is too much urea, both silo pumps can be started simultaneously for pneumatic conveying, greatly improving the urea transportation efficiency. Furthermore, this invention does not limit the use of one or more silo pumps in parallel as needed.
[0037] In this embodiment, a first feed valve 23 is provided between the top of the first hopper pump 22 and the first feed hopper 21, and a second feed valve 29 is provided between the top of the second hopper pump 28 and the second feed hopper 27. A level gauge and a pressure detector are provided in the upper part of both the first hopper pump 22 and the second hopper pump 28. The level gauge, the first feed valve 23, the second feed valve 29, the first air inlet 24, the first discharge outlet 25, the second air inlet 210, the second discharge outlet 211, the air inlet valve, and the pressure detector are all electrically connected to an external control system.
[0038] In this embodiment, multiple receiving bins 31 are provided, and multiple conveying branch pipes are respectively provided at the ends of the first conveying pipe 251 and the second conveying pipe 2111 to connect with multiple receiving bins 31; in this way, when a large amount of urea material needs to be conveyed, multiple receiving bins 31 can be used to store the urea material.
[0039] In this embodiment, the top of the receiving hopper 31 is provided with an exhaust pipe 34 and a dust collector 32, which makes the urea discharge from the receiving hopper 31 more stable and smooth, and ensures the cleanliness of the urea discharge.
[0040] Working principle: In this embodiment, the urea pneumatic conveying system 1 mainly consists of a feeding stage, a conveying stage, and a final purging stage. Specifically,
[0041] Feeding stage: Open the first feed valve 23 to feed granular urea from the first feed hopper 21 above the first hopper pump 22 into the first hopper pump 22. When the urea in the first hopper pump 22 rises and touches the level gauge, the level gauge sends a full signal, and the first feed valve 23 automatically closes. At the same time, a time monitoring program can be set in the control system to avoid long waiting times after the level gauge fails, and the feeding process can still be completed smoothly.
[0042] Then, the fluidization pressurization and conveying stage begins: After feeding is complete, the air inlet valve on the first air inlet 24 automatically opens, and the air storage tank 11 supplies air to the first chamber pump 22 through the air delivery pipe 12. When the pressure in the first chamber pump 22 reaches the preset value, the discharge valve of the first discharge port 25 automatically opens, and the urea material is discharged under pressure. At the same time, compressed air enters from the gasification chamber 26 at the bottom, diffuses, and passes through the fluidized bed to fluidize the material. While the material is fluidized, secondary fluidization and conveying are carried out. As the urea material in the first chamber pump 22 gradually decreases, the material on the fluidized bed is always fluidized and fed into the first conveying pipeline, thus being conveyed to the receiving hopper 31 and finally discharged from the material outlet 35.
[0043] Purging stage: When the urea material in the first chamber pump 22 is completely conveyed and the pressure drops to the pipeline resistance, the pressure detector sends a signal to the control system. The ventilation continues for a certain period of time, and the compressed air cleans the pipeline. Then the air inlet valve is closed, and after a certain interval, the first outlet 25 is closed, completing one conveying cycle, and then entering the next working cycle; thus completing the conveying of urea from the ground to the receiving silo 31 at a higher position.
[0044] This utility model conveying system features a low material flow rate, minimal wear on pipelines, and high conveying efficiency. Furthermore, the silo pump is small in size and lightweight, making installation and maintenance simple. The pneumatic conveying method utilizes a closed conveying system within the pipeline, ensuring that impurities cannot mix into the material, thus guaranteeing reliable system operation. Moreover, the system boasts a high degree of automation, controlled by a PLC system. Operation is simple, with dynamic display of operating status, fault alarms, and a sensitive response. It offers comprehensive processing functions, including remote and manual operation, making operation and management flexible, convenient, and reliable.
[0045] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A urea pneumatic conveying system characterized by, It includes a conveying system, a feeding system, and a premixing system connected in sequence; The feeding system includes a first hopper pump and a first feed hopper disposed on the top of the first hopper pump. A first air inlet is disposed on one side of the lower part of the first hopper pump, and a first discharge outlet is disposed on the other side. The conveying system includes a gas storage tank and a gas delivery pipe connected to the gas storage tank, and the end of the gas delivery pipe is connected to the first air inlet of the first chamber pump. The premixing system includes several receiving bins, each with a material inlet at the top and a material outlet at the bottom; the first discharge port of the first bin pump is connected to the material inlet of the receiving bin via a first conveying pipe.
2. The urea pneumatic conveying system of claim 1, wherein, The feeding system also includes a second hopper pump and a second feed hopper disposed on the top of the second hopper pump. A second air inlet is disposed on one side of the lower part of the second hopper pump, and a second discharge outlet is disposed on the other side. The second discharge outlet is connected to the material inlet of the receiving hopper through a second conveying pipe. The gas storage tank has two gas supply branch pipes connected to its gas supply pipe end. The two gas supply branch pipes are respectively connected to the first air inlet of the first chamber pump and the second air inlet of the second chamber pump.
3. The urea pneumatic conveying system of claim 2, wherein, Both the first and second chamber pumps are equipped with a gasification chamber at their bottom, and a fluidized bed is provided in the gasification chamber. The fluidized bed is located below the first air inlet and the first discharge outlet.
4. The urea pneumatic conveying system of claim 3, wherein, The bottom of the vaporization chamber is connected to a compressed air pipe, which is connected to an external compressed air supply device or an air storage tank.
5. The urea pneumatic conveying system of claim 2, wherein, Both the first feed hopper and the second discharge port have a funnel-shaped structure.
6. The urea pneumatic conveying system of claim 2, wherein, A first feed valve is provided between the top of the first hopper pump and the first feed hopper, and a second feed valve is provided between the top of the second hopper pump and the second feed hopper. A level gauge and a pressure detector are provided in the upper part of both the first and second hopper pumps. The level gauge, the first feed valve, the second feed valve, the first air inlet, the first discharge outlet, the second air inlet, the second discharge outlet, and the pressure detector are all electrically connected to an external control system.
7. The urea pneumatic conveying system of claim 1, wherein, The receiving bins are provided in multiple ways, and the ends of the first conveying pipe and the second conveying pipe are respectively provided with multiple conveying branch pipes that are connected to the multiple receiving bins.
8. The urea pneumatic conveying system of claim 1, wherein, The top of the receiving silo is equipped with an exhaust pipe and a dust collector.