Calcium carbide powder conveying device

Abstract

The utility model relates to a calcium carbide powder conveying device which comprises a magnetic separator (1), a transmitter (2), a nitrogen buffer tank (3), a buffer stock bin (4) and a conveying pipeline (5), and a feeding port (11) of the magnetic separator (1) is used for being communicated with a discharging port of a calcium carbide crusher. A sending inlet (21), an air inlet (22) and a sending outlet (23) are formed in the sender (2), and the sending inlet (21) is communicated with the discharging port (12) of the magnetic separator (1). A nitrogen outlet (31) of the nitrogen buffer tank (3) is communicated with the gas inlet (22), a buffer inlet (41) and a buffer outlet (42) are formed in the buffer bin (4), and the buffer outlet (42) is used for being communicated with an acetylene generator. And the conveying pipeline (5) is respectively communicated with the sending outlet (23) and the buffering inlet (41). According to the utility model, ferrosilicon particles in the calcium carbide powder can be removed, and the abrasion of the ferrosilicon particles in the calcium carbide powder to the conveying pipeline is reduced.

Description

Technical Field

[0001] The utility model relates to a calcium carbide powder conveying device, in particular to the structure of the calcium carbide powder conveying device. Background Art

[0002] In the acetylene production process of the PVC integration project, calcium carbide as raw material is crushed by a calcium carbide crusher to obtain calcium carbide powder. The calcium carbide powder is then transported to the acetylene generator through a conveying system to prepare acetylene gas. The calcium carbide powder is usually transported by an air flow conveying device. Compared with the previous belt conveyor or scraper bucket elevator conveying method, the air flow conveying method can avoid dust and the generation of falling materials that cause environmental pollution.

[0003] Calcium carbide powder contains ferrosilicon impurities, which have a high hardness. When it is transported by airflow, it will cause wear on the inner wall of the conveying pipeline, especially on the bends of the conveying pipeline. When the conveying pipeline is worn through by ferrosilicon, leakage will occur. Since chemical companies have the characteristics of strong continuity, the overall shutdown of the production system plays an important role in the stable supply of materials when the production system is running. Pipeline leakage will cause unstable supply of calcium carbide materials and restrict production.

[0004] Moreover, when calcium carbide powder leaks onto the ground, it will easily react with water in rainy or snowy weather to produce acetylene gas. Acetylene gas is flammable, explosive, and toxic, which can easily lead to safety accidents.

[0005] In addition, since the pipeline is located at a high altitude and there is calcium carbide powder in the conveying pipeline, the time required to inspect and repair the leaking points in the conveying pipeline is long, which often causes the entire production system to shut down.

[0006] The utility model aims to solve the problem that when the existing calcium carbide powder is transported by air flow, the transport pipeline is worn and leaks are caused. Utility Model Content

[0007] In order to solve the above problems, the utility model provides a calcium carbide powder conveying device, including a magnetic separator 1, a transmitter 2, a nitrogen buffer tank 3, a buffer silo 4 and a conveying pipeline 5. The feed port 11 of the magnetic separator 1 is used to communicate with the discharge port 61 of the calcium carbide crusher 6. The transmitter 2 is provided with a sending inlet 21 and an air inlet 22 at the top, and a sending outlet 23 at the bottom. The sending inlet 21 is connected to the discharge port 12 of the magnetic separator 1. The nitrogen outlet 31 of the nitrogen buffer tank 3 is connected to the air inlet 22, and the buffer silo 4 is provided with a buffer inlet 41 and a buffer outlet 42, and the buffer outlet 42 is used to communicate with the acetylene generator 7. The conveying pipeline 5 is respectively connected with the sending outlet 23 and the buffer inlet 41.

[0008] When the utility model is used, the feed port 11 of the magnetic separator 1 is connected to the discharge port 61 of the calcium carbide crusher 6, the buffer outlet 42 of the buffer silo 4 is connected to the acetylene generator 7, and the nitrogen buffer tank 3 is connected to the nitrogen device. The calcium carbide powder crushed by the calcium carbide crusher 6 is discharged from the discharge port 61 and enters the magnetic separator 1. After the ferrosilicon particles are removed by the magnetic separator 1, the calcium carbide powder enters the generator. The high-pressure nitrogen in the nitrogen buffer tank 3 enters the transmitter 2 from the air inlet 22 as a carrier gas, and after mixing with the calcium carbide powder, it enters the conveying pipeline 5 from the sending outlet 23 and is conveyed to the buffer silo 4. In the buffer silo 4, the calcium carbide powder and the carrier gas are separated, and the calcium carbide powder is regularly discharged into the acetylene generator 7. After the carrier gas is discharged, it continues to be used.

[0009] The utility model arranges a magnetic separator 1 at the front end of a transmitter 2. The magnetic separator 1 can first remove ferrosilicon particles in the calcium carbide powder crushed by a calcium carbide crusher 6, thereby reducing the content of ferrosilicon particles in the calcium carbide powder and reducing the wear of the conveying pipeline 5 by the ferrosilicon particles in the calcium carbide powder during pneumatic conveying, thereby extending the service life of the conveying pipeline 5, thereby solving the problem in the existing acetylene production system that the conveying pipeline 5 is prone to leakage, affecting normal production and causing safety accidents.

[0010] Preferably, the delivery pipeline 5 is a bimetallic high-chromium alloy pipeline. The bimetallic high-chromium alloy pipeline has the advantages of high hardness, wear resistance and impact resistance, and can extend the service life of the delivery pipeline 5.

[0011] Preferably, the conveying pipeline 5 is formed by connecting a conveying straight pipe 51 and a conveying elbow 52, ​​and a wear-resistant ceramic layer 53 is provided on the inner wall of the conveying elbow 52. The wear-resistant ceramic has high hardness and excellent wear resistance. The wear-resistant ceramic layer 53 is provided on the inner wall of the conveying elbow 52, ​​which can reduce the wear of the conveying elbow 52 by the material, greatly extend the service life of the conveying pipeline 5, and prevent the conveying pipeline 5 from leaking.

[0012] Preferably, the wear-resistant ceramic layer 53 has a thickness of 10 mm.

[0013] Preferably, the wear-resistant ceramic layer 53 is formed by laying a plurality of wear-resistant ceramic sheets 531, and a gap is maintained between two adjacent wear-resistant ceramic sheets 531. Since the wear-resistant ceramic will expand when heated and will shrink at low temperatures, the wear-resistant ceramic layer 53 is formed by laying a plurality of wear-resistant ceramic sheets 531, and a gap is maintained between two adjacent wear-resistant ceramic sheets 531, so as to prevent the conveying elbow 52 from being cracked and damaged due to the thermal expansion of the wear-resistant ceramic.

[0014] Preferably, protective rings 54 are provided on the inner walls of the two ends of the conveying elbow 52 near the opening, and the protective rings 54 are provided at the ends of the wear-resistant ceramic layer 53. Protective rings 54 are provided on the inner walls of the two ends of the conveying elbow 52 near the opening to prevent the wear-resistant ceramic sheet 531 from falling off due to the impact of the conveying material, and to prevent the edges of the wear-resistant ceramic sheet 531 from being crushed and cracked by the impact.

[0015] Preferably, the end face of the protective ring 54 facing the opening of the conveying elbow 52 is an inclined surface. Setting the end face of the protective ring 54 facing the opening as an inclined surface can guide the carrier gas, reduce the obstruction of the protective ring 54 to the airflow, reduce the impact of the calcium carbide powder on the protective ring 54, and extend the service life.

[0016] Preferably, an air-locking rotary valve 211 is provided on the sending inlet 21 , an air intake valve 221 is provided on the air inlet 22 , and a sending valve 231 is provided on the sending outlet 23 . BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 . Schematic diagram of the overall structure of the calcium carbide powder conveying device;

[0018] Figure 2 . Schematic diagram of the internal structure of the conveying elbow;

[0019] Figure 3 . Figure 2 The enlarged schematic diagram at A in the middle;

[0020] Figure 4 .Schematic diagram of the internal structure of the buffer silo;

[0021] Figure 5 .Diagram of usage status.

[0022] In the figure, 1. magnetic separator, 11. feed port, 12. discharge port, 2. transmitter, 21. transmission inlet, 211. air lock rotary valve, 22. air inlet, 221. air inlet valve, 23. transmission outlet, 231. transmission valve, 3. nitrogen buffer tank, 31. nitrogen outlet, 32. nitrogen inlet, 4. buffer silo, 41. buffer inlet, 42. buffer outlet, 43. exhaust port, 44. screen, 45. buffer cavity, 46. clean air cavity, 5. conveying pipeline, 51. conveying straight pipe, 52. conveying elbow, 53. wear-resistant ceramic layer, 531. wear-resistant ceramic sheet, 54. protective ring, 55. flange, 6. calcium carbide crusher, 61. discharge port, 7. acetylene generator. DETAILED DESCRIPTION

[0023] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0024] like Figure 1As shown, the calcium carbide powder conveying device includes a magnetic separator 1, a transmitter 2, a nitrogen buffer tank 3, a buffer silo 4 and a conveying pipeline 5. The magnetic separator 1 is provided with a feed port 11 and a discharge port 12. The feed port 11 of the magnetic separator 1 is used to communicate with the discharge port 61 of the calcium carbide crusher 6. The magnetic separator 1 can remove ferrosilicon particles in the calcium carbide powder after being crushed by the calcium carbide crusher 6. The magnetic separator 1 is an existing device, and the structure and working principle of the magnetic separator 1 are not repeated here.

[0025] The magnetic separator 1 can be provided to remove the ferrosilicon particles in the calcium carbide powder after being crushed by the calcium carbide crusher 6, thereby reducing the content of the ferrosilicon particles in the calcium carbide powder, reducing the wear of the conveying pipeline 5 by the ferrosilicon particles in the calcium carbide powder during pneumatic conveying, and extending the service life of the conveying pipeline 5.

[0026] The top of the transmitter 2 is provided with a transmission inlet 21, the side wall is provided with an air inlet 22, and the bottom is provided with a transmission outlet 23. The transmission inlet 21 is connected to the discharge port 12 of the magnetic separator 1. The transmission inlet 21 is provided with an air lock rotary valve 211, the air inlet 22 is provided with an air inlet valve 221, and the transmission outlet 23 is provided with a transmission valve 231.

[0027] An air-locking rotary valve 211 is provided on the sending inlet 21 to prevent leakage of carrier gas while calcium carbide powder is introduced into the sender 2 .

[0028] The nitrogen buffer tank 3 is provided with a nitrogen inlet 32 ​​and a nitrogen outlet 31. The nitrogen inlet 32 ​​is used to be connected to the nitrogen device, and the nitrogen outlet 31 is connected to the air inlet 22. The nitrogen buffer tank 3 buffers the nitrogen generated by the nitrogen device and discharges it into the transmitter 2, so that the pressure and flow rate of the nitrogen remain stable.

[0029] The buffer silo 4 is provided with a buffer inlet 41, a buffer outlet 42 and an exhaust port 43, and a screen 44 is provided inside. The screen 44 divides the buffer silo 4 into a clean air cavity 46 located above the screen 44 and a buffer cavity 45 located below the screen 44. The buffer inlet 41 and the buffer outlet 42 are connected to the buffer cavity 45, and the exhaust port 43 is connected to the clean air cavity 46. Figure 4 .

[0030] The buffer outlet 42 is used to communicate with the acetylene generator 7 .

[0031] After the nitrogen carrying calcium carbide powder enters the buffer silo 4 from the buffer inlet 41, it is filtered and separated by the screen 44. The filtered nitrogen enters the clean air cavity 46 and is discharged from the exhaust port 43. The calcium carbide powder is blocked by the screen 44 and stored in the buffer cavity 45, and is discharged into the acetylene generator 7 from the buffer outlet 42 at regular intervals.

[0032] The delivery pipeline 5 is respectively connected with the sending outlet 23 and the buffer inlet 41. The delivery pipeline 5 is formed by a delivery straight pipe 51 and a delivery elbow 52 connected by flanges, and the delivery straight pipe 51 and the delivery elbow 52 are connected by a bimetallic high chromium alloy pipe.

[0033] Bimetallic high chromium alloy pipes have the advantages of high hardness, wear resistance and impact resistance, and can extend the service life of the conveying pipeline 5.

[0034] like Figure 2 and Figure 3 As shown, a wear-resistant ceramic layer 53 is provided on the inner wall of the conveying elbow 52, ​​and the thickness of the wear-resistant ceramic layer 53 is 10 mm. In other embodiments, the thickness of the wear-resistant ceramic layer 53 can also be set as needed under the condition of ensuring wear resistance and not affecting material transportation, for example, the thickness of the wear-resistant ceramic layer 53 can be set to 5 to 15 mm.

[0035] Since the calcium carbide powder has a certain thickness during the transmission process inside the magnetic separator 1, the ferrosilicon particles cannot be completely removed, and some ferrosilicon particles will still enter the subsequent system with the material. Wear-resistant ceramics have high hardness and excellent wear resistance. The wear-resistant ceramic layer 53 is arranged on the inner wall of the conveying elbow 52, ​​which can reduce the wear of the material on the conveying elbow 52, ​​greatly extend the service life of the conveying pipeline 5, and prevent the conveying pipeline 5 from leaking.

[0036] The length of the wear-resistant ceramic layer 53 can be set according to the length of the conveying elbow 52 and the flow rate of the carrier gas. For example, the length of the wear-resistant ceramic layer 53 can be set to be 5 to 50 cm extending from the bend of the conveying elbow 52 along the conveying elbow 52 to both ends.

[0037] The wear-resistant ceramic layer 53 is formed by laying a plurality of wear-resistant ceramic sheets 531, and gaps are maintained between adjacent wear-resistant ceramic sheets 531. Since the wear-resistant ceramic will expand when heated and shrink at low temperatures, the wear-resistant ceramic layer 53 is formed by laying a plurality of wear-resistant ceramic sheets 531, and gaps are maintained between adjacent wear-resistant ceramic sheets 531, so as to prevent the conveying elbow 52 from being cracked and damaged due to thermal expansion of the wear-resistant ceramic.

[0038] Flanges 55 are provided at both ends of the conveying elbow 52, ​​and protective rings 54 are provided on the inner walls of both ends of the conveying elbow 52 near the openings. The protective rings 54 are provided at the ends of the wear-resistant ceramic layer 53, and the end surface of the protective ring 54 facing the opening of the conveying elbow 52 is a slope.

[0039] Protective rings 54 are provided on the inner walls of both ends of the conveying elbow 52 near the openings to prevent the wear-resistant ceramic sheet 531 from being impacted and falling off by the conveying material, and to prevent the edges of the wear-resistant ceramic sheet 531 from being impacted and broken and cracked.

[0040] The end face of the protective ring 54 facing the opening of the conveying elbow 52 is set as an inclined surface, which can guide the carrier gas, reduce the obstruction of the protective ring 54 to the airflow, reduce the impact of ferrosilicon particles in the calcium carbide powder on the protective ring 54, and extend the service life.

[0041] like Figure 5 As shown, when the utility model is used, the feed port 11 of the magnetic separator 1 is connected to the discharge port 61 of the calcium carbide crusher 6, the buffer outlet 42 of the buffer silo 4 is connected to the acetylene generator 7, and the nitrogen buffer tank 3 is connected to the nitrogen device. The calcium carbide powder crushed by the calcium carbide crusher 6 is discharged from the discharge port 61 and enters the magnetic separator 1. After the magnetic separator 1 removes the ferrosilicon particles, the calcium carbide powder enters the generator. The high-pressure nitrogen in the nitrogen buffer tank 3 enters the transmitter 2 from the air inlet 22 as a carrier gas, and after mixing with the calcium carbide powder, it enters the conveying pipeline 5 from the sending outlet 23 and is conveyed to the buffer silo 4. In the buffer silo 4, the calcium carbide powder and the carrier gas are separated, and the calcium carbide powder enters the acetylene generator 7 at a fixed time, and continues to be used after the carrier gas is discharged.

[0042] The utility model arranges a magnetic separator 1 at the front end of a transmitter 2, and the magnetic separator 1 can first remove the ferrosilicon particles in the calcium carbide powder crushed by the calcium carbide crusher 6, thereby reducing the content of the ferrosilicon particles in the calcium carbide powder, reducing the wear of the conveying pipeline 5 by the ferrosilicon particles in the calcium carbide powder during pneumatic conveying, and extending the service life of the conveying pipeline 5.

[0043] By providing a wear-resistant ceramic layer 53 on the inner wall of the conveying elbow 52, ​​the wear of the conveying elbow 52 by the material can be reduced, the service life of the conveying pipeline 5 can be greatly extended, and leakage of the conveying pipeline 5 can be prevented. The wear-resistant ceramic layer 53 is provided by laying a plurality of wear-resistant ceramic sheets 531, and a gap is maintained between two adjacent wear-resistant ceramic sheets 531, which can prevent the conveying elbow 52 from being cracked and damaged due to thermal expansion of the wear-resistant ceramic.

[0044] By providing protective rings 54 on the inner walls near the openings at both ends of the conveying elbow 52, ​​the wear-resistant ceramic sheet 531 can be prevented from falling off due to the impact of the conveying material, and the edge of the wear-resistant ceramic sheet 531 can be prevented from being broken and cracked by the impact. The end face of the protective ring 54 facing the opening of the conveying elbow 52 is provided as an inclined surface, which can guide the carrier gas, reduce the obstruction of the protective ring 54 to the airflow, reduce the impact of the calcium carbide powder on the protective ring 54, and extend the service life.

[0045] It should be noted that the above-mentioned embodiments illustrate rather than limit the invention and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims.

Claims

1. Calcium carbide powder conveying device, characterized in that: It comprises a magnetic separator (1), a transmitter (2), a nitrogen buffer tank (3), a buffer silo (4) and a conveying pipeline (5). The feed port (11) of the magnetic separator (1) is used to communicate with the feed port of the calcium carbide crusher; The transmitter (2) is provided with a transmitting inlet (21) and an air inlet (22) at the top, and a transmitting outlet (23) at the bottom; The sending inlet (21) is in communication with the discharge port (12) of the magnetic separator (1); The nitrogen outlet (31) of the nitrogen buffer tank (3) is in communication with the air inlet (22); The buffer silo (4) is provided with a buffer inlet (41) and a buffer outlet (42). The buffer outlet (42) is used to communicate with the acetylene generator; The delivery pipeline (5) is communicated with the sending outlet (23) and the buffer inlet (41) respectively.

2. The calcium carbide powder conveying device according to claim 1, characterized in that: The delivery pipeline (5) is a bimetallic high-chromium alloy pipeline.

3. The calcium carbide powder conveying device according to claim 2, characterized in that: The delivery pipeline (5) is formed by connecting a delivery straight pipe (51) and a delivery elbow pipe (52). A wear-resistant ceramic layer (53) is provided on the inner wall of the conveying elbow (52).

4. The calcium carbide powder conveying device according to claim 3 is characterized in that: The thickness of the wear-resistant ceramic layer (53) is 10 mm.

5. The calcium carbide powder conveying device according to claim 4, characterized in that: The wear-resistant ceramic layer (53) is formed by laying out a plurality of wear-resistant ceramic sheets (531). A gap is maintained between two adjacent wear-resistant ceramic sheets (531).

6. The calcium carbide powder conveying device according to claim 5, characterized in that: Protective rings (54) are provided on the inner walls of both ends of the conveying elbow (52) near the openings. The protective ring (54) is arranged at the end of the wear-resistant ceramic layer (53).

7. The calcium carbide powder conveying device according to claim 6, characterized in that: The end surface of the protective ring (54) on the side facing the opening of the delivery elbow (52) is an inclined surface.

8. The calcium carbide powder conveying device according to any one of claims 1 to 7, characterized in that: The sending inlet (21) is provided with an air-locking rotary valve (211); The air inlet (22) is provided with an air inlet valve (221); The sending outlet (23) is provided with a sending valve (231).

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