Gas-assisted small-dip-angle particulate matter conveying pipeline
By designing a gas-assisted, small-angle particle conveying pipeline in a large-particle urea production unit, and utilizing the assisting air and buffer chamber structure, the problem of pipeline blockage was solved, achieving stable material flow and environmental improvement, thereby increasing production efficiency and economic benefits.
Patent Information
- Application Number
- CN202520664608.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-10
- Publication Date
- 2026-02-10
- Estimated Expiration
- 2035-04-10
AI Technical Summary
In existing granular urea production equipment, the small inclination angle of the conveying pipeline leads to poor material feeding, easy blockage, affecting production and increasing costs.
A gas-assisted small-angle particulate conveying pipeline is designed. By setting up an assisting air pipe and a buffer chamber inside the chute, the flowability of the particulate material is improved by using assisting air. Combined with vent holes and pressure regulating valves to control the gas flow rate, the material is kept in suspension.
It improves material feeding smoothness, reduces dust buildup on walls, extends the service life of conveying pipelines, improves the working environment, recovers trace amounts of dust, reduces product temperature, and reduces equipment load.
Smart Images
Figure CN223891996U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of large-particle urea production equipment, specifically providing a gas-assisted small-angle particle conveying pipeline. Background Technology
[0002] Currently, the main methods for producing large-particle urea worldwide include fluidized bed granulation, rotary drum granulation, disc granulation, steel belt water-cooled granulators, and advanced rotary drum fluidization processes. Some of these processes have limitations.
[0003] For example, fluidized bed granulation can be quite large-scale, but the process is complex, requires a large number of equipment, a high-frame layout, and high investment. Other methods have limited reasonable scale and also have relatively high energy consumption and investment. In particular, to reduce energy consumption, the use of high-frame self-weight conveying of large granular products places high demands on the height of the frame structure. Considering design requirements, cost input, and ease of operation, the design height of the frame structure is limited. If the frame structure height is insufficient, the inclination angle of the large urea chute conveying pipeline is small, and the difference between the weight of the large urea particles and their friction is small, resulting in poor material discharge, pipeline blockage, and production disruptions or even shutdowns. Summary of the Invention
[0004] This utility model addresses the shortcomings of the prior art by providing a gas-assisted small-angle particulate conveying pipeline that is reasonably designed, simple in structure, safe to use, and convenient to operate.
[0005] The technical solution adopted by this utility model to solve its technical problem is:
[0006] A gas-assisted small-angle particulate conveying pipeline includes a chute, wherein the top end of the chute is provided with a particulate material inlet and the bottom end is provided with a particulate material outlet, and the chute is inclined.
[0007] An assist air pipe is provided at the upper part of the chute. One end of the assist air pipe is connected to the blower outlet pipe, and the other end is connected to the assist air buffer chamber.
[0008] The assist air buffer chamber is located on the lower wall of the chute, and the lower wall of the chute is provided with a vent hole. The assist air buffer chamber is connected to the chute through the vent hole.
[0009] The bottom upper wall of the chute is provided with an air outlet for assisting air, and an air outlet pipe is connected to the upper part of the air outlet for assisting air, and the air outlet pipe is connected to the dust collector inlet pipe.
[0010] Furthermore, the blower outlet pipe is connected to the main booster air pipe, the main booster air pipe is connected to the booster air pipeline, and the booster air pipeline is equipped with a buffer chamber pressure regulating valve;
[0011] An auxiliary air inlet valve is installed at the interface between the auxiliary air main pipe and the blower outlet pipe.
[0012] Furthermore, there are 2 to 4 air-assisted pipes, and one end of each air-assisted pipe is connected to its own air-assisted buffer chamber. The air-assisted buffer chambers are arranged sequentially downward from the inlet of the particulate material and are fixed to the lower wall of the chute.
[0013] Furthermore, the assisted air buffer chamber includes an assisted air buffer chamber body and an assisted air buffer chamber lower wall, and each assisted air buffer chamber lower wall is provided with a buffer chamber drain valve at its bottom.
[0014] Furthermore, the chute includes an upper wall, a cavity, and a lower wall, and the lower wall of the chute is provided with a vent hole at the connection between it and the booster air buffer cavity.
[0015] Furthermore, an outlet regulating butterfly valve is provided at the connection between the outlet pipe and the dust collector inlet pipe, and an outlet regulating butterfly valve is provided at the particulate material outlet;
[0016] Each of the aforementioned air-assisted buffer chambers is equipped with a pressure transmitter, and a pressure transmitter is also located above the particulate material outlet.
[0017] Preferably, the inclination angle of the chute is 30° to 45°; the angle of the vent is 15° to 22.5°; and the chute is made of stainless steel.
[0018] Compared with existing technologies, the gas-assisted small-angle particulate matter conveying pipeline of this utility model has the following outstanding advantages:
[0019] This invention increases the flow of the feed gas, making the urea flow in a slightly suspended state. This improves the condition of dust clinging to the feed pipe and extends the service life of the conveying chute. At the same time, the trace amounts of dust in the conveying chute will also be recycled into the dust collector, greatly improving the working environment at the feed port and generating some economic benefits.
[0020] The addition of air allows for secondary cooling of large urea particles, reducing the load on the product plate cooler.
[0021] If the fluidizing blower has sufficient air volume, this technology can also be used in inclined conveying pipelines to reduce the temperature of large urea particles, recover trace amounts of dust, and improve the feeding working environment.
[0022] In summary, the present invention has a reasonable design, simple structure, is safe and reliable, and is easy to use, and has great value for promotion and application. Attached Figure Description
[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0024] Appendix Figure 1 This is a schematic diagram of a gas-assisted, small-angle particle conveying pipeline.
[0025] Appendix Figure 2 This is a schematic diagram of the gas-assisted section in a gas-assisted small-angle particulate matter conveying pipeline.
[0026] Appendix Figure 3 It is attached Figure 1 Sectional view at point AA;
[0027] Appendix Figure 4 It is attached Figure 1 Sectional view at point BB.
[0028] The markings in the attached diagram represent:
[0029] 1. Particulate matter inlet, 2. Chute, 3. Particulate matter outlet, 4. Outlet regulating butterfly valve, 5 (ac), booster air buffer chamber, 6 (ac), booster air pipeline, 7 (ac), buffer chamber pressure regulating valve, 8 (ac), buffer chamber drain valve, 9. booster air main pipe, 10. auxiliary air inlet main valve, 11. blower outlet pipeline, 12. auxiliary air outlet, 13. outlet regulating butterfly valve, 14. dust collector inlet pipeline, 15. outlet pipeline, P1, P2, P3, P4 pressure transmitters;
[0030] ① Chute cavity, ② Chute upper wall, ③ Chute lower wall, ④ Assisted air buffer cavity, ⑤ Assisted air buffer cavity lower wall, ⑥ Assisted air pipe inlet, ⑦ Vent hole. Detailed Implementation
[0031] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention.
[0032] In this utility model, unless otherwise stated, directional terms such as "upper," "lower," "left," and "right" generally refer to the upper, lower, left, and right as shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself.
[0033] The following is a preferred embodiment:
[0034] like Figure 1-2As shown, a gas-assisted small-angle particulate conveying pipeline in this embodiment includes a chute 2. The top end of the chute 2 is provided with a particulate material inlet 1, which is connected to the outlet of a screening machine. The bottom end is provided with a particulate material outlet 3, which is connected to the inlet of a packaging machine. The chute 2 is inclined, and in this embodiment, the angle of the chute 2 is 30°.
[0035] An air-assisted pipe 6(ac) is provided at the upper part of the chute 2. One end of the air-assisted pipe 6(ac) is connected to the blower outlet pipe 11, and the other end is connected to the air-assisted buffer chamber 5(ac).
[0036] The assist air buffer chamber 5(ac) is located on the lower wall ③ of the chute, and the lower wall ③ of the chute is provided with a vent hole ⑧. The assist air buffer chamber 6(ac) is connected to the chute 2 through the vent hole ⑧.
[0037] The bottom upper wall ② of the chute 2 is provided with an air-assisted outlet 12, and an air outlet pipe 15 is connected to the upper part of the air-assisted outlet 12. The air outlet pipe 15 is connected to the dust collector inlet pipe 14.
[0038] In this embodiment, the blower outlet pipe 11 is first connected to the booster air main pipe 9, the booster air main pipe 9 is connected to the booster air pipe 6(ac), and the booster air pipe 6(ac) is provided with a buffer chamber pressure regulating valve 7(ac).
[0039] An auxiliary air inlet valve 10 is provided at the interface between the auxiliary air main pipe 9 and the blower outlet pipe 11.
[0040] In this embodiment, there are 3 air-assisted pipes 6 (ac), and one end of each air-assisted pipe 6 (ac) is connected to its own air-assisted buffer chamber 5 (ac). The air-assisted buffer chambers 5 (ac) are arranged sequentially downward from the particulate material inlet 1 and fixed to the lower wall ③ of the chute.
[0041] like Figure 4 As shown, the power-assisted air buffer chamber 5(ac) includes a power-assisted air buffer chamber body ④ and a lower wall of the power-assisted air buffer chamber ⑤. Each lower wall of the power-assisted air buffer chamber ⑤ is provided with a buffer chamber drain valve 8(ac) at its bottom.
[0042] like Figure 3 As shown, the chute 2 includes an upper wall ②, a chute cavity ①, and a lower wall ③. A vent hole 15 is provided at the connection between the lower wall ③ and the booster air buffer cavity 5 (ac).
[0043] Among them, the vent hole ⑦ is inclined downward at a horizontal angle of 15°, with a length ≤ 1 / 2 of the length of the chute 2 and a width ≤ 1 / 3 of the circumference of the chute 2. The number, distribution, angle, and diameter of the vent holes ⑦ need to be determined according to the flow rate, velocity, and mass of the particulate material.
[0044] An outlet regulating butterfly valve 13 is provided at the connection between the outlet pipe 15 and the dust collector inlet pipe 14, and an outlet regulating butterfly valve 4 is provided at the particulate material outlet 3.
[0045] Each air-assisted buffer chamber 5(ac) is equipped with a pressure transmitter (P1-P3), and a pressure transmitter P4 is located above the particulate material outlet 3.
[0046] In this embodiment, a gas-assisted small-angle particle conveying pipeline is used, taking large-particle urea as an example. The screening machine feeds the particle material from the particle material inlet 1 into the chute 2, and it flows out from the particle material outlet 3 under the action of gravity and assisted air. The assisted air comes from the particle system blower 11 and enters the assisted air main pipe 9 through the assisted air inlet main valve 10. The pressure regulating valves 7a, 7b, and 7c of the buffer chamber are adjusted and enter their respective assisted air buffer chambers through the assisted air pipes 6a, 6b, and 6c. The gas enters the chute through the 15° angle vent hole on the upper wall of the assisted air buffer chamber, i.e., the lower pipe wall ③ of the stainless steel chute. The gas pressure and volume are adjusted according to the material quantity through the pressure regulating valves 7a, 7b, and 7c of the buffer chamber to ensure that the particle material is slightly suspended, while avoiding the generation of powder due to large suspension impact.
[0047] Among them, the buffer chamber pressure regulating valves 7a, 7b, and 7c control the boost air in the boost air pipes 6a, 6b, and 6c, so that the boost air entering the boost air buffer chambers 5a, 5b, and 5c through the boost air pipe inlet ⑥ is regulated.
[0048] The air outlet 12 adjusts the air volume of the gas entering the dust collector inlet pipe 14 through the outlet regulating butterfly valve 13, and works in conjunction with the outlet regulating butterfly valve 4 to achieve the same direction of gas and material in the stainless steel chute 2 and maintain a slightly negative pressure state in the stainless steel chute 2.
[0049] If the ventilation holes on the lower wall ③ of the chute become blocked after long-term use, the following two methods can be used to address the blockage:
[0050] The first method involves closing the outlet regulating butterfly valve 4, closing the buffer chamber pressure regulating valves 7a, 7b, and 7c, adding water from the granular material inlet 1 for soaking, and then opening the outlet regulating butterfly valve 4 and the buffer chamber drain valves 8a, 8b, and 8c for drainage.
[0051] Another method involves connecting low-pressure steam to the buffer chamber drain valves 8a, 8b, and 8c for hot washing, opening the outlet regulating butterfly valve 4 to drain water, and using the granular material outlet 1 to discharge steam.
[0052] The gas pressure in each booster air buffer chamber 5 is initially regulated by the booster air inlet main valve 10 and then secondarily regulated by the buffer chamber pressure regulating valve 7 to ensure the stability of the booster air pressures P1, P2, and P3 in each booster air buffer chamber. The gas pressure passing through the booster air buffer chamber 5 is also controlled to prevent excessively high gas pressure, which could cause excessive material flow or flying collisions, resulting in excessive powder or breakage and affecting product quality.
[0053] The dust collector inlet pipe 14 connected to the outlet regulating butterfly valve 13 has a negative pressure of approximately -2000 Pa. It is necessary to adjust the outlet regulating butterfly valve 13 to control the pressure P4 in the chute to <500 Pa. The above-described embodiments are merely one preferred embodiment of this utility model. Ordinary variations and substitutions made by those skilled in the art within the scope of this utility model's technical solution should be included within the protection scope of this utility model.
Claims
1. A gas-assisted small-angle particulate matter conveying pipeline, comprising a chute, characterized in that, The chute is provided with a granular material inlet at the top and a granular material outlet at the bottom, and the chute is inclined. An assist air pipe is provided at the upper part of the chute. One end of the assist air pipe is connected to the blower outlet pipe, and the other end is connected to the assist air buffer chamber. The assist air buffer chamber is located on the lower wall of the chute, and the lower wall of the chute is provided with a vent hole. The assist air buffer chamber is connected to the chute through the vent hole. The bottom upper wall of the chute is provided with an air outlet for assisting air, and an air outlet pipe is connected to the upper part of the air outlet for assisting air, and the air outlet pipe is connected to the dust collector inlet pipe.
2. The gas-assisted small-angle particulate matter conveying pipeline according to claim 1, characterized in that, The blower outlet pipe is connected to the main auxiliary air pipe, the main auxiliary air pipe is connected to the auxiliary air pipe, and the auxiliary air pipe is equipped with a buffer chamber pressure regulating valve. An auxiliary air inlet valve is installed at the interface between the auxiliary air main pipe and the blower outlet pipe.
3. The gas-assisted small-angle particulate matter conveying pipeline according to claim 2, characterized in that, Two to four auxiliary air ducts are provided, and one end of each auxiliary air duct is connected to its own auxiliary air buffer chamber. The auxiliary air buffer chambers are arranged sequentially downward from the particulate material inlet and are fixed to the lower wall of the chute.
4. A gas-assisted small-angle particulate matter conveying pipeline according to claim 3, characterized in that, The assisted air buffer chamber includes an assisted air buffer chamber body and an assisted air buffer chamber lower wall, and each assisted air buffer chamber lower wall is provided with a buffer chamber drain valve at the bottom.
5. A gas-assisted small-angle particulate matter conveying pipeline according to claim 1 or 4, characterized in that, The chute includes an upper wall, a cavity, and a lower wall, with a vent hole at the connection between the lower wall and the booster air buffer cavity.
6. A gas-assisted small-angle particulate matter conveying pipeline according to claim 5, characterized in that, An outlet regulating butterfly valve is provided at the connection between the outlet pipe and the dust collector inlet pipe, and an outlet regulating butterfly valve is provided at the outlet of the particulate material. Each of the aforementioned air-assisted buffer chambers is equipped with a pressure transmitter, and a pressure transmitter is also located above the particulate material outlet.
7. A gas-assisted small-angle particulate matter conveying pipeline according to claim 6, characterized in that, The chute has an inclination angle of 30° to 45°; the vent is set at an angle of 15° to 22.5°; and the chute is made of stainless steel.