Storage tank nitrogen sealing gas separation and recovery system

Abstract

The invention relates to the technical field of material storage containers, in particular to a storage tank nitrogen sealing gas separation and recovery system which comprises a nitrogen sealing mechanism and a material conveying mechanism which are arranged at the upper end and the lower end of a storage tank in a communicating mode respectively. The exhaust end of the nitrogen sealing mechanism is communicated to an exhaust main pipe, the exhaust main pipe is sequentially communicated with a condenser, a buffer tank and a fractionation mechanism, and a gas connecting pipe is further communicated between the buffer tank and the fractionation mechanism. According to the storage tank nitrogen sealing gas separation and recovery system, direct emission is avoided, and the system is more environmentally friendly; and the nitrogen sealing gas of various liquid-phase material storage tanks can be recycled and separated in a centralized manner.

Description

Technical Field

[0001] The invention relates to the technical field of material storage containers, in particular to a nitrogen-sealed gas separation and recovery system for a storage tank. Background Art

[0002] The nitrogen sealing system is to fill the storage tank with nitrogen to form a nitrogen sealing layer, and control the composition, pressure and temperature of the liquid material in the storage tank to maintain a stable state, thereby reducing the volatilization and oxidation of the liquid material, preventing external air and moisture from entering the storage tank, and maintaining the stability and safety of the liquid material stored in the storage tank. Nitrogen sealing technology is widely used in liquid storage tanks in the chemical, petroleum, food, and pharmaceutical industries. The nitrogen sealing system can not only extend the shelf life of stored items, prevent oxidation and volatilization, but also improve storage safety and reduce environmental pollution. Therefore, the nitrogen sealing system is of great significance in improving industrial production efficiency and ensuring safety.

[0003] At present, the conventional nitrogen sealing system is to introduce nitrogen into the liquid material storage tank to achieve nitrogen sealing. When filling and discharging materials, the pressure balance in the storage tank is achieved by supplying nitrogen and discharging atmospheric air. It can be seen that the conventional nitrogen sealing system still has the following shortcomings: 1. When filling materials, the nitrogen in the storage tank is discharged, which will cause waste of nitrogen and vaporized materials; 2. If the exhaust gas is simply condensed and recovered, only a single material can be recovered. Summary of the invention

[0004] In order to solve the technical problems existing in the background technology, the present invention provides a storage tank nitrogen sealing gas separation and recovery system, which has no direct discharge and is more environmentally friendly; it can centrally recover and separate the nitrogen sealing gas of various liquid material storage tanks.

[0005] The technical solution adopted by the present invention is: A storage tank nitrogen sealing gas separation and recovery system comprises: a nitrogen sealing mechanism and a material conveying mechanism respectively connected to the upper and lower ends of the storage tank. The exhaust end of the nitrogen sealing mechanism is connected to the exhaust main pipe, and the exhaust main pipe is connected to a condenser, a buffer tank, and a fractionation mechanism in sequence, and a gas connecting pipe is also connected between the buffer tank and the fractionation mechanism.

[0006] Furthermore, the material conveying mechanism is used to supply and discharge materials into the storage tank, including: A main connecting pipe connected to the lower end of the storage tank, the main connecting pipe is connected to a first discharge valve and a delivery pump, the main connecting pipe between the first discharge valve and the delivery pump is connected to a feed pipe, the feed pipe is connected to a second feed valve; bypass pipes are connected in parallel at both ends of the main connecting pipe, the bypass pipe is connected to the first feed valve; the end of the main connecting pipe is connected to a discharge pipe, the discharge pipe is connected to a second discharge valve.

[0007] Furthermore, the nitrogen sealing mechanism is used to replenish and discharge nitrogen into the storage tank, including: A tubular lower valve body is connected to the upper end of the storage tank, and an inner sleeve which is open at the upper part and closed at the lower part is arranged in the lower valve body. An exhaust port which is connected to the condenser is arranged on one side of the lower valve body, and the exhaust port is connected to the sleeve space between the lower valve body and the inner sleeve, and the position of the exhaust port is higher than the closed part of the lower end of the inner sleeve; a tubular upper valve body is coaxially sealed and connected to the upper end of the lower valve body, and an air inlet is connected to one side of the upper valve body, and the air inlet is connected to the nitrogen supply pipeline. An adjusting plate is screwed on the upper valve body, and a protruding upper end surface of the adjusting plate is provided with An adjusting ear and a main valve plate are arranged directly below the adjusting plate, a sliding sleeve is extended upward from the center of the main valve plate, the sliding sleeve is slidably inserted in the center of the adjusting plate, a main push spring is abutted between the adjusting plate and the main valve plate, an air passage is penetrated on the main valve plate around the sliding sleeve, a secondary valve plate for sealing the air passage is centrally sealed at the lower end of the main valve plate, a screw is extended upward from the center of the secondary valve plate, the screw is inserted in the sliding sleeve, an adjusting nut is threaded on the screw, a secondary push spring is abutted between the sliding sleeve and the adjusting nut; a valve cover is provided on the upper end sealing cover of the upper valve body.

[0008] Furthermore, the upper end of the inner sleeve is flush with the upper end of the lower valve body, and the main valve plate is sealed and crimped with the flush inner sleeve and the upper end surface of the lower valve body.

[0009] Furthermore, the distillation mechanism includes: a heating kettle connected to the lower end of the buffer tank; a splitter tube is sealed and connected at the upper end of the heating kettle, and multiple groups of splitter tubes are coaxially sealed and connected, a partition is provided at the lower part of the splitter tube, an air hole group is penetrated through the partition, an instrument port group and a distillation pipe are connected on the side wall of the splitter tube, a pressure transmitter and a temperature transmitter are sealed and inserted in the instrument port group, and the distillation pipe is arranged above the edge of the partition; the upper end sealing cover of the uppermost splitter tube is provided with a head cover.

[0010] Furthermore, the partition is configured to be in the shape of a trumpet with a wide opening facing downward.

[0011] Furthermore, the partition is configured to be in a hemispherical shape with the convex surface facing upward.

[0012] Furthermore, a concave guide groove is provided on the partition at the distillation pipe.

[0013] Furthermore, a waste liquid outlet is provided at the lower end of the heating kettle.

[0014] Furthermore, a nitrogen exhaust pipe connected to the gas connecting pipe is arranged in the center of the head cover.

[0015] Beneficial effects of the storage tank nitrogen sealing gas separation and recovery system and adjustment method of the present invention: 1. Use a single conveying pump in the material conveying mechanism to achieve material injection and discharge; 2. Ensure the nitrogen sealing environment through the nitrogen sealing mechanism and discharge the nitrogen sealing gas to the exhaust main pipe; 3. The material and nitrogen are recovered through the condenser, buffer tank and fractionation mechanism which are sequentially connected to the exhaust main pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall process flow of an embodiment of the present invention; Figure 2 Schematic diagram of a nitrogen sealing mechanism according to an embodiment of the present invention; Figure 3 This invention is an example Figure 1 An enlarged schematic diagram of the material conveying mechanism in FIG. Figure 4 It is a three-dimensional cutaway schematic diagram of a diverter tube of an example of the present invention; In the figure: 10. Storage tank, 11. Material conveying mechanism, 12. Main connecting pipe, 13. Bypass pipe, 14. Feed pipe, 15. Discharge pipe, 161. First discharge valve, 162, first feed valve, 163, second feed valve, 164, second discharge valve, 17, delivery pump, 20. Nitrogen sealing mechanism, 210, lower valve body, 211, inner sleeve, 212, exhaust port, 220, upper valve body, 221, air inlet, 222, adjusting plate, 223, adjusting ear, 224, main valve plate, 225, sliding sleeve, 226, main push spring, 227, auxiliary valve plate, 228, screw, 229, adjusting nut, 2210, auxiliary push spring, 230, valve cover, 30. Condenser, 40. Buffer tank, 50. Fractionation mechanism, 51. Diverter tube, 52. Partition plate, 53. Air hole group, 54. Instrument port group, 55. Fractionation pipe, 56. Guide trough. DETAILED DESCRIPTION

[0017] In order to more clearly and specifically explain the specific implementation purpose and implementation mode of the present invention, the technical solution of the present invention will be fully described below. The described embodiments are part of the embodiments of the present invention, but not all of them. Without making creative work, all other embodiments based on the embodiments described in the present invention belong to the protection scope of the present invention.

[0018] The present invention provides a storage tank nitrogen sealing gas separation and recovery system, such as Figure 1 As shown, including: The nitrogen sealing mechanism 20 and the material conveying mechanism 11 disposed at the upper and lower ends of the storage tank 10 are respectively connected.

[0019] The material conveying mechanism 11 is used to supply and discharge materials into the storage tank 10. Figure 3 As shown, including: A main connecting pipe 12 is connected to the lower end of the storage tank 10, and a first discharge valve 161 and a delivery pump 17 are connected to the main connecting pipe 12. A feed pipe 14 is connected to the main connecting pipe 12 between the first discharge valve 161 and the delivery pump 17, and a second feed valve 163 is connected to the feed pipe 14; bypass pipes 13 are connected in parallel at both ends of the main connecting pipe 12, and a first feed valve 162 is connected to the bypass pipe 13; a discharge pipe 15 is connected to the end of the main connecting pipe 12, and a second discharge valve 164 is connected to the discharge pipe 15.

[0020] The nitrogen sealing mechanism 20 is used to replenish and discharge nitrogen into the storage tank 10. Figure 2 As shown, including: A tubular lower valve body 210 is connected to the upper end of the storage tank 10, a flame arrester is arranged in the lower end opening of the lower valve body 210, an inner sleeve 211 which is open at the upper part and closed at the lower part is arranged in the lower valve body 210, an exhaust port 212 which is connected to the condenser 30 is arranged on one side of the lower valve body 210, the exhaust port 212 is connected to the sleeve space between the lower valve body 210 and the inner sleeve 211, the position of the exhaust port 212 is higher than the closed part of the lower end of the inner sleeve 211, the upper end of the inner sleeve 211 is flush with the upper end of the lower valve body 210, and the main valve plate 224 is sealed and crimped with the flush inner sleeve 211 and the upper end surface of the lower valve body 210; The upper end of the lower valve body 210 is coaxially sealed and connected with a tubular upper valve body 220, one side of the upper valve body 220 is connected with an air inlet 221, and the air inlet 221 is connected with a nitrogen supply pipeline. An adjusting plate 222 is threadedly provided in the upper valve body 220, and an adjusting ear 223 is protruding from the upper end surface of the adjusting plate 222. A main valve plate 224 is provided just below the adjusting plate 222, and a sliding sleeve 225 is extended upward from the center of the main valve plate 224, and the sliding sleeve 225 is slidably inserted in the adjusting plate 22 2, a main push spring 226 is disposed between the regulating plate 222 and the main valve plate 224, an air passage is penetrated on the main valve plate 224 around the sliding sleeve 225, and a secondary valve plate 227 for sealing the air passage is sealed at the center of the lower end of the main valve plate 224, a screw rod 228 is extended upward from the center of the secondary valve plate 227, the screw rod 228 is inserted into the sliding sleeve 225, an adjusting nut 229 is threadedly disposed on the screw rod 228, and a secondary push spring 2210 is disposed between the sliding sleeve 225 and the adjusting nut 229; The upper end sealing cover of the upper valve body 220 is provided with a valve cover 230 .

[0021] The exhaust port 212 of the nitrogen sealing mechanism 20 is connected to an exhaust main pipe, and the exhaust main pipe is connected to the condenser 30, the buffer tank 40, and the fractionation mechanism 50 in sequence.

[0022] The buffer tank 40 and the fractionation mechanism 50 are connected with each other through a gas connection pipe.

[0023] The fractionation mechanism 50 is used to heat the condensed material and fractionate the materials with different boiling points, such as Figure 4 As shown, including: A heating kettle connected to the lower end of the buffer tank 40, wherein the lower end of the heating kettle is provided with a waste liquid outlet; The upper end of the heating kettle is sealed and connected with a flow divider 51, and the flow divider 51 is coaxially sealed and connected with multiple groups. A cooling jacket is sealed on the outer wall of the flow divider 51, and a partition 52 is provided at the lower part of the flow divider 51. The partition 52 is set in a trumpet shape with a large mouth downward or a hemispherical shape with a convex surface upward. An air hole group 53 is penetrated through the partition 52. An instrument port group 54 and a fractionation pipe 55 are connected and connected on the side wall of the flow divider 51. The partition 52 at the fractionation pipe 55 is provided with an inwardly concave guide groove 56. A pressure transmitter and a temperature transmitter are sealed and inserted in the instrument port group 54. The fractionation pipe 55 is arranged above the edge of the partition 52. The upper sealing cover of the topmost diversion tube 51 is provided with a head cover, and a nitrogen exhaust pipe connected to the gas connecting pipe is provided in the center of the head cover.

[0024] According to the specific structure of a storage tank nitrogen sealing gas separation and recovery system in the above embodiment, the working method of a storage tank nitrogen sealing gas separation and recovery system is further described below: A. Filling and exhausting: Close the first discharge valve 161 and the second discharge valve 164; open the first feed valve 162 and the second feed valve 163; start the delivery pump 17; and thereby inject material into the storage tank 10; During this process, the storage tank 10 is under positive pressure, and the upper nitrogen-sealed gas in the storage tank 10 passes through the lower valve body 210 to lift the main valve plate 224, and the nitrogen-sealed gas flows from the space between the lower valve body 210 and the inner sleeve 211 to the exhaust port 212 and is discharged into the exhaust main pipe; When the main valve plate 224 is lifted up, it has a blocking effect on the upper valve body 220 , thereby preventing the nitrogen supplied from the air inlet 221 from flowing into the exhaust port 212 .

[0025] B. Discharge and air supply: Open the first discharge valve 161 and the second discharge valve 164; close the first feed valve 162 and the second feed valve 163; start the delivery pump 17; and discharge the material into the storage tank 10; During this process, the storage tank 10 is under negative pressure, and the auxiliary valve plate 227 is opened. The nitrogen supplied from the air inlet 221 flows from the opened auxiliary valve plate 227 through the inner sleeve 211 and the lower valve body 210 into the storage tank 10 .

[0026] C. Fractionation recovery: In order to store a variety of different materials, multiple storage tanks 10 are provided, and the nitrogen sealing gas from the exhaust port 212 of the nitrogen sealing mechanism 20 of each storage tank 10 is collected through the exhaust main pipe, and then condensed into liquid through the condenser 30, and finally stored in the buffer tank 40, and the amount of condensed liquid in the buffer tank 40 is measured by the liquid level meter; The condensate in the buffer tank 40 is sent to the heating kettle for heating, so that the condensate is vaporized and flows into the split tube 51. The temperature and pressure in the split tube 51 are adjusted by the cooling jacket, so that the vaporized product is condensed onto the partition plate 52 and discharged from the fractionation pipe 55. The discharged material is used as a raw material in the original production process. Balance the pressure in the buffer tank 40 and the fractionation mechanism 50 during the fractionation process through the gas connection pipe; In order to fractionate different materials, the number of splitting cylinders 51 is ≥ the number of material types.

[0027] D. Nitrogen recovery: The exhaust gas after the distillation is nitrogen, which is discharged from the nitrogen exhaust pipe, passes through a cyclone separator and a freeze dryer to remove water, and is compressed by a compressor and stored in a nitrogen storage tank.

[0028] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Through the above description, relevant staff can make various changes and modifications without departing from the technical concept of the present invention. The technical scope of the present invention is not limited to the contents of the specification. All so-called equal changes and modifications of the shapes, structures, features and spirits described in the scope of the claims of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A storage tank nitrogen blanketing gas separation and recovery system, characterized by: include: The nitrogen sealing mechanism (20) and the material conveying mechanism (11) are respectively connected to the upper and lower ends of the storage tank (10); The exhaust end of the nitrogen sealing mechanism (20) is connected to an exhaust main pipe, and the exhaust main pipe is connected to a condenser (30), a buffer tank (40), and a fractionation mechanism (50) in sequence, and an air connection pipe is also connected between the buffer tank (40) and the fractionation mechanism (50).

2. A storage tank nitrogen blanketing gas separation and recovery system according to claim 1, characterized in that: The material conveying mechanism (11) is used to supply and discharge materials into the storage tank (10), and comprises: a main connecting pipe (12) connected to the lower end of the storage tank (10), the main connecting pipe (12) being connected to a first discharge valve (161) and a delivery pump (17), a feed pipe (14) being connected to the main connecting pipe (12) between the first discharge valve (161) and the delivery pump (17), and a second feed valve (163) being connected to the feed pipe (14); The two ends of the main connecting pipe (12) are connected in parallel with bypass pipes (13), and the bypass pipe (13) is connected with a first feed valve (162); The end of the main connecting pipe (12) is connected to a discharge pipe (15), and the discharge pipe (15) is connected to a second discharge valve (164).

3. A storage tank nitrogen blanketing gas separation and recovery system according to claim 1, characterized in that: The nitrogen sealing mechanism (20) is used to replenish and discharge nitrogen into the storage tank (10), and comprises: a tubular lower valve body (210) connected to the upper end of the storage tank (10), wherein an inner sleeve (211) with an open upper portion and a closed lower portion is disposed in the lower valve body (210), and an exhaust port (212) connected to the condenser (30) is disposed on one side of the lower valve body (210), wherein the exhaust port (212) is connected to the sleeve space between the lower valve body (210) and the inner sleeve (211), and the position of the exhaust port (212) is higher than the closed lower end of the inner sleeve (211); The upper end of the lower valve body (210) is coaxially sealed and connected to a tubular upper valve body (220); an air inlet (221) is connected to one side of the upper valve body (220); the air inlet (221) is connected to a nitrogen supply pipeline; an adjusting plate (222) is threadedly provided inside the upper valve body (220); an adjusting ear (223) is protruding from the upper end surface of the adjusting plate (222); a main valve plate (224) is provided directly below the adjusting plate (222); a sliding sleeve (225) is provided in the center of the main valve plate (224) extending upward; the sliding sleeve (225) is slidably inserted into the adjusting plate (222) A main push spring (226) is disposed in contact with the adjusting plate (222) and the main valve plate (224); an air passage is provided through the main valve plate (224) around the sliding sleeve (225); a secondary valve plate (227) for sealing the air passage is provided in the center of the lower end of the main valve plate (224); a screw rod (228) is provided in the center of the secondary valve plate (227) extending upward; the screw rod (228) is inserted into the sliding sleeve (225); an adjusting nut (229) is threadedly provided on the screw rod (228); and a secondary push spring (2210) is disposed in contact with the sliding sleeve (225) and the adjusting nut (229); The upper end sealing cover of the upper valve body (220) is provided with a valve cover (230).

4. A storage tank nitrogen blanketing gas separation and recovery system according to claim 3, characterized in that: The upper end of the inner sleeve (211) is flush with the upper end of the lower valve body (210), and the main valve plate (224) is sealed and crimped with the flush inner sleeve (211) and the upper end surface of the lower valve body (210).

5. A storage tank nitrogen blanketing gas separation and recovery system according to claim 1, characterized in that: The fractionation mechanism (50) comprises: a heating kettle connected to the lower end of the buffer tank (40); The upper end of the heating kettle is sealed and connected with a flow divider (51), and the flow divider (51) is coaxially sealed and connected with a plurality of groups. A partition (52) is provided at the lower part of the flow divider (51), and an air hole group (53) is penetrated through the partition (52). An instrument port group (54) and a fractionation pipe (55) are connected and connected on the side wall of the flow divider (51). A pressure transmitter and a temperature transmitter are sealed and inserted in the instrument port group (54), and the fractionation pipe (55) is arranged above the edge of the partition (52); The upper end sealing cover of the uppermost diversion cylinder (51) is provided with a head cover.

6. A storage tank nitrogen blanketing gas separation and recovery system according to claim 5, characterized in that: The partition (52) is configured in a trumpet shape with a wide opening facing downward.

7. A storage tank nitrogen blanketing gas separation and recovery system according to claim 5, characterized in that: The partition (52) is configured in a hemispherical shape with the convex surface facing upward.

8. A storage tank nitrogen blanketing gas separation and recovery system according to claim 5, characterized in that: The partition plate (52) at the fractionation pipe (55) is provided with an inwardly concave guide groove (56).

9. A storage tank nitrogen blanketing gas separation and recovery system according to claim 5, characterized in that: The lower end of the heating kettle is provided with a waste liquid discharge port.

10. A storage tank nitrogen blanketing gas separation and recovery system according to claim 5, characterized in that: A nitrogen exhaust pipe connected to the gas connecting pipe is arranged in the center of the head cover.

Images