Nitrogen circulating conveying system

Abstract

The utility model discloses a nitrogen circulating conveying system, relates to the field of material conveying systems, solves the problem that material conveying is affected by nitrogen leakage, and comprises a material sending tank, a material storage bin used for storing materials and a material discharging pipe communicated with the material sending tank and the material storage bin, and the material sending tank is communicated with an exhaust pipe used for injecting compressed nitrogen. The storage bin is provided with a dust remover; the refrigeration dryer is communicated with the nitrogen making machine, the low-pressure balance tank is connected with the refrigeration dryer, the first pressure regulating gulp valve group, the air compressor group and the high-pressure tank are arranged between the refrigeration dryer and the low-pressure balance tank, the air storage tank is communicated with the material sending tank, the high-pressure tank is communicated with a main pipeline, and the air storage tank is communicated with the main pipeline; the low-pressure balance tank and the high-pressure tank are respectively provided with a detection assembly; the low-pressure balance tank is communicated with the refrigeration dryer, the dust remover is communicated with a low-pressure air return pipeline used for recovering nitrogen, and the low-pressure air return pipeline is communicated with the low-pressure balance tank; and a high-pressure air supplementing pipeline is communicated between the main pipeline and the low-pressure air return pipeline.

Description

Technical Field

[0001] The present application relates to the field of material conveying systems, and in particular to a nitrogen circulation conveying system. Background Art

[0002] Pneumatic conveying is an important part of clean production. It is a process that replaces traditional mechanical material conveying with sealed conveying pipelines. It is particularly suitable for conveying powdered or granular materials. In the process of conveying some special materials, there may be situations where the materials are damp, oxidized, or exploded, so nitrogen is needed for conveying.

[0003] Some existing positive pressure dilute phase nitrogen delivery systems include a sending tank, a storage bin, a delivery pipe connected to the sending tank and the storage bin, the sending tank is connected to an exhaust pipe for injecting nitrogen, the storage bin is connected to a dust collector, the dust collector is used to filter the nitrogen discharged from the storage bin, and intercept the material in the storage bin. During transportation, the compressed nitrogen is injected into the sending tank, so that the material in the sending tank and the nitrogen are mixed, and at the same time, the discharge valve at the bottom of the sending tank is opened, and the mixed material and nitrogen are discharged into the delivery pipe, and then transported to the storage bin, and the mixed material and nitrogen are separated by the dust collector, so that the material is intercepted and falls into the storage bin, and the nitrogen is discharged from the storage bin, and recycled after the nitrogen is discharged from the storage bin.

[0004] However, in the process of using nitrogen to transport materials, there is a possibility of nitrogen leakage. Nitrogen leakage may exist at the connection between pipelines, the connection between pipelines and sending tanks or storage silos, etc., which are not easy to repair. Moreover, after nitrogen leakage, the gas volume and pressure of nitrogen in the conveying system cannot be effectively controlled, which can easily affect material transportation. Utility Model Content

[0005] In order to improve the problem of material transportation being affected by nitrogen leakage, the present application provides a nitrogen circulation and transportation system.

[0006] The present application provides a nitrogen circulation and delivery system, which adopts the following technical solution:

[0007] A nitrogen circulation and delivery system comprises a sending tank, a storage bin for storing materials, a discharge pipe connected to the sending tank and the storage bin, the sending tank is connected to an exhaust pipe for injecting compressed nitrogen, and the storage bin is provided with a dust collector; it also comprises a nitrogen generator for preparing nitrogen, a cold dryer connected to the nitrogen generator, a low-pressure balance tank for buffering pressure fluctuations of the delivery system, a first pressure regulating and air-supplementing valve group arranged between the cold dryer and the low-pressure balance tank, an air compressor group for pressurization, a high-pressure tank for storing compressed nitrogen, and a gas storage tank connected to the sending tank.

[0008] The high-pressure tank is connected to a main pipeline, and the gas storage tank is connected to the main pipeline;

[0009] The low-pressure balancing tank and the high-pressure tank are respectively provided with detection components for detecting pressure;

[0010] The low-pressure balancing tank is connected to the cold dryer, the dust collector is connected to a low-pressure return air duct for recovering nitrogen, and the low-pressure return air duct is connected to the low-pressure balancing tank; a high-pressure air supply pipe is connected between the main line and the low-pressure return air duct.

[0011] By adopting the above technical scheme, when the detection component detects that the nitrogen pressure in the conveying system is insufficient, the nitrogen generator works to input the produced nitrogen into the cold dryer for dehumidification and impurity removal, and then uses the first pressure regulating air supply valve group to regulate the pressure of the nitrogen before discharging it into the low-pressure balance tank. The nitrogen in the low-pressure balance tank is discharged into the air compressor unit for compression, and the compressed nitrogen is stored in the high-pressure tank; the compressed nitrogen in the high-pressure tank is discharged into each pipeline of the conveying system through the main pipeline and the high-pressure air supply pipeline, so that the nitrogen pressure in the conveying system is increased to a pressure value that meets the conveying requirements, and the injection of compressed nitrogen is stopped, and material transportation can continue, thereby improving the problem of material transportation affected by nitrogen leakage.

[0012] Optionally, the detection component includes a pressure transmitter for transmitting a pressure signal to the conveying system, a pressure gauge for displaying and controlling the pressure, and a safety valve for protecting the safety of the conveying system.

[0013] By adopting the above technical solution, during the material transportation process, the pressure gauge is used to measure the pressure of the low-pressure balance tank, and the pressure data is transmitted to the transportation system through the pressure transmitter, so as to monitor and control the air pressure in the transportation system online in real time. In addition, when the pressure in the low-pressure balance tank is too high, part of the nitrogen can be discharged through the safety valve to ensure the safety of the low-pressure balance tank.

[0014] Optionally, a second pressure-regulating air supply valve group is provided between the high-pressure air supply pipe and the low-pressure return air pipe.

[0015] By adopting the above technical solution, when the compressed nitrogen is discharged into the low-pressure return air duct, the second pressure regulating air supply valve group is used to regulate the pressure of the compressed nitrogen so as to safely and stably supply the compressed nitrogen into the low-pressure return air duct.

[0016] Optionally, the low-pressure return air duct is provided with a return air main duct dust collector connected to the low-pressure balancing tank.

[0017] By adopting the above technical solution, the return air main duct dust collector is used to clean the recovered nitrogen again to ensure the cleanliness and purity of the nitrogen recovered into the low-pressure balance tank.

[0018] Optionally, the low-pressure return air duct is provided with an exhaust valve, and the exhaust valve is located between the return air main duct dust collector and the low-pressure balance tank.

[0019] By adopting the above technical solution, the exhaust valve is used to discharge excess nitrogen or nitrogen with low purity.

[0020] Optionally, the high-pressure air supply pipe is connected to a first branch pipe, and the first branch pipe is connected to a first air supply pipe and a second air supply pipe at one end away from the high-pressure air supply pipe. The first air supply pipe is provided with a switching ball valve, and the second air supply pipe is provided with a third pressure-regulating air supply valve group; the first air supply pipe is connected to a return air main dust collector, and the second air supply pipe is connected to a low-pressure return air duct.

[0021] By adopting the above technical solution, when insufficient pressure is detected due to nitrogen leakage in the conveying system, the first branch line is used to convey the compressed nitrogen to the first air supply pipe and the second air supply pipe, and the compressed nitrogen is discharged into the return air main dust collector and the low-pressure return air duct to achieve pressure regulation of the conveying system.

[0022] Optionally, a manual ball valve and a pneumatic switch valve are provided between the main pipeline and the high-pressure air supply pipeline.

[0023] By adopting the above technical solution, a manual ball valve and a pneumatic switch valve are used to control the connection between the main pipeline and the high-pressure air supply pipeline to ensure the air pressure in the delivery system pipeline.

[0024] Optionally, an air release valve is provided between the high-pressure tank and the air compressor unit.

[0025] By adopting the above technical solution, the air release valve is used to discharge excess nitrogen.

[0026] In summary, the beneficial effects of this application are:

[0027] 1. During the material conveying process, the pressure is measured by a pressure gauge, and the pressure data is transmitted to the conveying system through a pressure transmitter. When the detection component detects that the nitrogen pressure in the conveying system is insufficient, the compressed nitrogen in the high-pressure tank is discharged into each pipeline of the conveying system through the main pipeline and the high-pressure air supply pipeline, so that the nitrogen pressure in the conveying system is increased to a pressure value that meets the conveying requirements. The injection of compressed nitrogen is stopped, and material conveying can be carried out, thereby improving the problem of material conveying affected by nitrogen leakage;

[0028] 2. When the pressure in the low-pressure balance tank is too high, part of the nitrogen can be discharged through the safety valve, exhaust valve and vent valve to ensure the safety of the conveying system and equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1It is a structural schematic diagram of the nitrogen circulation and delivery system of this embodiment of the present application.

[0030] Description of the reference numerals: 1. Sending tank; 101. Exhaust pipe; 2. Storage bin; 21. Dust collector; 3. Discharge pipe; 4. Nitrogen generator; 5. Cold dryer; 6. Low-pressure balance tank; 7. Air compressor unit; 8. High-pressure tank; 81. Main pipeline; 811. Gas distribution pipe; 9. Gas storage tank; 10. Low-pressure return air pipeline; 11. Return air main dust collector; 12. Exhaust valve; 13. Gas pipeline; 131. First adjustment 1. High-pressure air supply valve group; 14. Detection component; 141. Pressure transmitter; 142. Pressure gauge; 143. Safety valve; 15. Release valve; 16. High-pressure air supply pipeline; 161. Second pressure-regulating air supply valve group; 17. Manual ball valve; 18. Pneumatic switch valve; 19. First branch pipeline; 191. First air supply pipe; 192. Second air supply pipe; 193. Switch ball valve; 20. Third pressure-regulating air supply valve group. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1 This application is described in further detail.

[0032] A nitrogen circulation and delivery system disclosed in the embodiment of the present application, referring to Figure 1 The nitrogen recycling and transportation system includes a sending tank 1, a storage bin 2 for storing materials, a discharge pipe 3 connected to the sending tank 1 and the storage bin 2, a nitrogen generator 4 for preparing nitrogen, a cold dryer 5 connected to the nitrogen generator 4, a low-pressure balance tank 6 for buffering pressure fluctuations in the transportation system, an air compressor unit 7 for compressing nitrogen, a high-pressure tank 8 for storing compressed nitrogen, and a gas storage tank 9 connected to the sending tank 1. When the nitrogen pressure in the transportation system is insufficient, the compressed nitrogen in the high-pressure tank 8 is input into the pipeline in the transportation system, so that the nitrogen pressure in the transportation system meets the transportation requirements.

[0033] Reference Figure 1 , wherein the sending material tank 1 is connected to an exhaust pipe 101, and one end of the exhaust pipe 101 away from the sending material tank 1 is connected to the gas storage tank 9, and the exhaust pipe 101 injects compressed nitrogen into the sending material tank 1. The high-pressure tank 8 is connected to a main line 81, and the main line 81 is connected to a gas branch pipe 811, and the gas branch pipe 811 is connected to the gas storage tank 9. The gas branch pipe 811 and the main line 81 are used to discharge the compressed gas in the high-pressure tank 8 into the gas storage tank 9. In actual applications, there can be multiple gas branch pipes 811, and the number of gas storage tanks 9 is the same as the number of gas branch pipes 811. One gas branch pipe 811 is installed corresponding to one gas storage tank 9 to realize the simultaneous transportation of multiple different materials.

[0034] Reference Figure 1A dust collector 21 is installed on the top of the storage bin 2 for filtering and discharging nitrogen. The dust collector 21 is connected to a low-pressure return air duct line 10, and the low-pressure return air duct line 10 is connected to a low-pressure balance tank 6 for recovering nitrogen discharged from the storage bin 2. The low-pressure return air duct is equipped with a return air main dust collector 11 for secondary cleaning of the recovered nitrogen to improve the purity of the nitrogen discharged into the low-pressure balance tank 6; the return air main dust collector 11 is connected to the low-pressure balance tank 6 through the low-pressure return air duct line 10. In addition, the low-pressure return air duct line 10 is equipped with an exhaust valve 12 for discharging excess nitrogen; the exhaust valve 12 is located between the return air main dust collector 11 and the low-pressure balance tank 6.

[0035] Reference Figure 1 The low-pressure balance tank 6 is connected to a gas pipeline 13, and one end of the gas pipeline 13 away from the low-pressure balance tank 6 is connected to the cold dryer 5, and the nitrogen is transported from the cold dryer 5 to the low-pressure balance tank 6. The gas pipeline 13 is installed with a first pressure regulating and air-supplementing valve group 131, which is used to detect the pressure of nitrogen in the gas pipeline 13. The first pressure regulating and air-supplementing valve group 131 includes a manual ball valve, a pressure regulating valve, an electromagnetic switch valve, etc. installed on the gas pipeline 13.

[0036] Reference Figure 1 The low-pressure balance tank 6 and the high-pressure tank 8 are respectively provided with a detection assembly 14 to measure and adjust the pressure of the nitrogen discharged from the cold dryer 5 into the low-pressure balance tank 6. The detection assembly 14 includes a pressure transmitter 141, a pressure gauge 142, and a safety valve 143. A pressure transmitter 141, a pressure gauge 142, and a safety valve 143 are installed as a set on the top of the low-pressure bottle or the top of the high-pressure tank 8. Among them, the pressure gauge 142 is used to display and control the pressure, the pressure transmitter 141 is used to transmit the pressure signal to the conveying system for communication control, and the safety valve 143 is used to protect the safety of the low-pressure balance tank 6 and the high-pressure tank 8.

[0037] Reference Figure 1 The air compressor unit 7 is connected to the high-pressure tank 8 to discharge the compressed nitrogen into the high-pressure tank 8. A vent valve 15 is installed between the high-pressure tank 8 and the air compressor unit 7 to discharge excess compressed nitrogen to ensure the safety of the delivery system.

[0038] Reference Figure 1The main line 81 is connected to a high-pressure air supply pipe 16, and one end of the high-pressure air supply pipe 16 away from the main line 81 is connected to the low-pressure return air pipe 10, which is used to supply compressed nitrogen to the low-pressure return air pipe 10. A manual ball valve 17 and a pneumatic switch valve 18 are installed between the main line 81 and the high-pressure air supply pipe 16, which are used to control the compressed nitrogen from the main line 81 to the high-pressure air supply pipe 16. Two different switches are used for control, which can ensure the safety of the transportation system. During installation, the manual ball valve 17 is located between the pneumatic switch valve 18 and the high-pressure tank 8. In addition, a second pressure-regulating air supply valve group 161 is installed between the high-pressure air supply pipe 16 and the low-pressure return air pipe 10 to measure and regulate the pressure of the nitrogen discharged from the high-pressure air supply pipe 16 to the low-pressure return air pipe 10. The components used in the second pressure-regulating air supply valve group 161 are the same as those of the first pressure-regulating air supply valve group 131.

[0039] Reference Figure 1 Furthermore, the high-pressure air supply pipe 16 is connected to a first branch pipe 19, and one end of the first branch pipe 19 away from the high-pressure air supply pipe 16 is connected to a first air supply pipe 191 and a second air supply pipe 192. Among them, the first air supply pipe 191 is connected to the return air main dust collector 11, and the second air supply pipe 192 is connected to the low-pressure return air pipe 10. When the nitrogen pressure in the conveying system is insufficient, the compressed nitrogen can be discharged into the low-pressure return air pipe 10 through the first branch pipe 19, the first air supply pipe 191 and the second air supply pipe 192. The first air supply pipe 191 is installed with a switch ball valve 193, which is used to control the compressed nitrogen from the first branch pipe 19 to the first air supply pipe 191. In addition, a third pressure regulating air supply valve group 20 is installed between the second air supply pipe 192 and the low-pressure return air pipe 10 to measure and regulate the pressure of the nitrogen discharged from the second air supply pipe 192 into the low-pressure return air pipe 10. The components used in the third pressure regulating air supply valve group 20 are the same as those of the first pressure regulating air supply valve group 131.

[0040] The implementation principle of a nitrogen circulation and delivery system in an embodiment of the present application is as follows: when the two groups of pressure gauges 142 detect that the nitrogen pressure in the delivery system is insufficient, the nitrogen generator 4 is started to work, and the produced nitrogen is discharged into the cold dryer 5 for dehumidification and impurity removal, and the nitrogen is pressure-regulated by the first pressure-regulating and air-supplementing valve group 131 before being discharged into the low-pressure balance tank 6, and the nitrogen in the low-pressure balance tank 6 is discharged into the air compressor unit 7 for compression, and the compressed nitrogen is stored in the high-pressure tank 8; the manual ball valve 17 and the pneumatic switch valve 18 are opened, and the compressed nitrogen is discharged into the low-pressure return air duct 10 through the main line 81 and the high-pressure air-supplementing pipe line 16, so that the nitrogen pressure in the delivery system is increased to a pressure value that meets the delivery requirements, and the injection of compressed nitrogen is stopped, and material transportation can be carried out, thereby improving the problem of material transportation affected by nitrogen leakage.

[0041] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A nitrogen circulation and delivery system, comprising a sending tank (1), a storage bin (2) for storing materials, and a discharge pipe (3) connected to the sending tank (1) and the storage bin (2), wherein the sending tank (1) is connected to an exhaust pipe (101) for injecting compressed nitrogen, and the storage bin (2) is provided with a dust collector (21); characterized in that: The system also includes a nitrogen generator (4) for preparing nitrogen, a cold dryer (5) connected to the nitrogen generator (4), a low-pressure balance tank (6) for buffering pressure fluctuations in the conveying system, a first pressure regulating and air supply valve group (131) arranged between the cold dryer (5) and the low-pressure balance tank (6), an air compressor group (7) for pressurizing, a high-pressure tank (8) for storing compressed nitrogen, and a gas storage tank (9) connected to the sending tank (1). The high-pressure tank (8) is connected to a main pipeline (81), and the gas storage tank (9) is connected to the main pipeline (81); The low-pressure balancing tank (6) and the high-pressure tank (8) are respectively provided with a detection component (14) for detecting pressure; The low-pressure balancing tank (6) is connected to the cold dryer (5); the dust collector (21) is connected to a low-pressure return air duct (10) for recovering nitrogen; the low-pressure return air duct (10) is connected to the low-pressure balancing tank (6); and a high-pressure air supply duct (16) is connected between the main line (81) and the low-pressure return air duct (10).

2. A nitrogen circulation and delivery system according to claim 1, characterized in that: The detection assembly (14) comprises a pressure transmitter (141) for transmitting a pressure signal to a conveying system, a pressure gauge (142) for displaying and controlling pressure, and a safety valve (143) for protecting the safety of the conveying system.

3. A nitrogen circulation and delivery system according to claim 1, characterized in that: A second pressure regulating air supply valve group (161) is provided between the high-pressure air supply pipe (16) and the low-pressure return air pipe (10).

4. A nitrogen circulation and delivery system according to claim 1, characterized in that: The low-pressure return air duct (10) is provided with a return air main duct dust collector (11) connected to the low-pressure balance tank (6).

5. A nitrogen circulation and delivery system according to claim 1, characterized in that: The low-pressure return air duct (10) is provided with an exhaust valve (12), and the exhaust valve (12) is located between the return air main duct dust collector (11) and the low-pressure balance tank (6).

6. A nitrogen circulation and delivery system according to claim 1, characterized in that: The high-pressure air supply pipe (16) is connected to a first branch pipe (19); one end of the first branch pipe (19) away from the high-pressure air supply pipe (16) is connected to a first air supply pipe (191) and a second air supply pipe (192); the first air supply pipe (191) is provided with a switch ball valve (193), and the second air supply pipe (192) is provided with a third pressure-regulating air supply valve group (20); the first air supply pipe (191) is connected to a return air main dust collector (11), and the second air supply pipe (192) is connected to a low-pressure return air pipe (10).

7. A nitrogen circulation and delivery system according to claim 1, characterized in that: A manual ball valve (17) and a pneumatic switch valve (18) are provided between the main pipeline (81) and the high-pressure air supply pipeline (16).

8. A nitrogen circulation and delivery system according to claim 1, characterized in that: An air release valve (15) is provided between the high-pressure tank (8) and the air compressor unit (7).

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