A drying device using cold energy for LNG filling station

Abstract

The application discloses a kind of dryers for LNG filling station using cold energy, it relates to a kind of energy utilization technical field, including LNG storage tank, freon storage tank, heat exchange box, drying cylinder, vacuum machine and ice maker, the output of the LNG storage tank is connected together by liquid inlet pipe and the input of heat exchange box, while the input of the side of heat exchange box close to liquid inlet pipe is also equipped with air inlet pipe, the other end of air inlet pipe and the output of freon storage tank are connected together, wherein freon storage tank is filled with gas freon, wherein LNG and freon carry out cold exchange in heat exchange box, liquid-state freon after cold exchange is introduced into drying cylinder to refrigerate material, and vacuum drying is realized to material in drying cylinder by vacuum machine after refrigeration is completed, and water vapor in drying process is introduced into ice maker to refrigerate, ice maker is installed on the top of heat exchange box, lost cold energy is introduced into ice maker to utilize by fan, realize the full use of LNG cold energy, reduce energy waste.

Description

Technical Field

[0001] The present invention relates to the technical field of energy utilization, in particular to a drying device for an LNG filling station that utilizes cold energy. Background Art

[0002] Liquefied natural gas (LNG) is liquefied natural gas stored at approximately 110K and a pressure of 0.1 MPa. Its primary component is methane. Because its volume is only 1 / 600 of its gaseous state, LNG is a highly efficient method for storing and transporting natural gas. Before being supplied to the natural gas pipeline network, LNG must be vaporized and rewarmed to a temperature between -20°C and 40°C. LNG releases approximately 870 kJ / kg of cold energy during vaporization. Due to its low storage temperature, its cold energy has a high quality. Fully utilizing the cold energy generated during LNG vaporization can conserve resources, protect the environment, and significantly reduce energy waste. While some LNG cold energy utilization devices exist, their utilization methods are relatively limited, resulting in low cold energy efficiency. Therefore, we have designed a drying device for LNG filling stations that utilizes cold energy. Summary of the Invention

[0003] In view of the problems existing in the prior art, the purpose of the present invention is to provide a drying device using cold energy for LNG filling stations, which uses LNG cold energy for vacuum condensation drying and refrigeration, thereby achieving a higher cold energy utilization rate.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: comprising an LNG storage tank, a Freon storage tank, a heat exchange box, a drying cylinder, a vacuum machine and an ice maker, wherein the output end of the LNG storage tank is connected to the input end of the heat exchange box through a liquid inlet pipe, and an air inlet pipe is also installed at the input end of the heat exchange box close to the liquid inlet pipe, and the other end of the air inlet pipe is connected to the output end of the Freon storage tank, wherein the Freon storage tank is filled with gaseous Freon, and the output end of the heat exchange box is respectively connected to a liquid guide pipe and an air outlet pipe, and the air outlet pipe is connected to the LNG output pipeline network, and the other end of the liquid guide pipe is fixedly installed at the input end of the booster pump, and the output end of the booster pump is connected to the drying cylinder through a liquid infusion pipe, and the side wall of the drying cylinder is connected to the vacuum machine through an exhaust pipe, and a fan is fixedly installed at the bottom of the heat exchange box, and an ice maker is installed above the heat exchange box, wherein the bottom of the ice maker is connected to the exhaust end of the fan; A first diverter plate is fixedly installed at the bottom of the drying cylinder, wherein the side wall of the first diverter plate and the end of the liquid infusion pipe are connected together, and at the same time, multiple groups of heat exchange tubes are fixedly installed on the top of the first diverter plate, and the heat exchange tubes and the interior of the diverter plate are connected together, and a first collector plate is installed on the top of the heat exchange tubes, and the first collector plate is fixedly installed on the inner wall of the drying cylinder, wherein an exhaust pipe is fixedly installed on the top of the first collector plate, and the other end of the exhaust pipe is connected to the input end of the Freon storage tank; the heat exchange box is configured as a hollow box body, and a second diverter plate is fixedly installed on the right side of the interior of the heat exchange box, wherein the right side wall of the second diverter plate and the output end of the liquid inlet pipe are connected together, and multiple groups of gasification tubes are fixedly installed on the left wall of the second diverter plate, wherein a second collector plate is fixedly installed on the left wall of the gasification tube, and the top wall of the second collector plate and the end of the gas outlet pipe are connected together to form an LNG flow channel, and the gas inlet pipe and the liquid guide pipe are both connected to the interior of the heat exchange box.

[0005] As a further solution of the present invention: two groups of partitions arranged perpendicular to each other are fixedly installed inside the gasification tube, and the partitions divide the interior of the gasification tube into four groups of independent flow guide cavities, and the partitions are also made of heat-conducting material.

[0006] As a further solution of the present invention: a feed hopper is fixedly installed on the top of the drying cylinder, the bottom of the feed hopper extends from the inside of the first manifold, and a discharge pipe is fixedly installed on the bottom of the drying cylinder, the end of the discharge pipe also extends from the inside of the first diverter plate, wherein a solenoid valve is fixedly installed inside the feed hopper and the discharge pipe.

[0007] As a further solution of the present invention: multiple groups of grooves are opened on the side wall of the partition, and the contact area between the liquid and the partition is increased by the grooves. In addition, multiple groups of annular wing plates are fixedly installed on the outer wall of the vaporization tube, and the wing plates are also made of heat-conducting material.

[0008] As a further solution of the present invention, a plurality of hollow columns are fixedly installed inside the heat exchange box, and both ends of the hollow columns are respectively connected to the fan and the ice maker.

[0009] As a further solution of the present invention: a pressure-stabilizing pump is fixedly installed inside the liquid inlet pipe.

[0010] As a further solution of the present invention: a plurality of heating plates are fixedly installed on the bottom of the first diverter plate.

[0011] As a further solution of the present invention, the liquid discharge end of the vacuum machine is connected to the output end of the ice maker through a return pipe.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention is provided with a drying cylinder and an ice maker, wherein LNG and Freon are exchanged for cold in a heat exchange box, and the liquid Freon after the exchange is introduced into the drying cylinder to refrigerate the material. After the refrigeration is completed, the material inside the drying cylinder is vacuum dried by a vacuum machine, and the water vapor in the drying process is introduced into the ice maker for refrigeration, wherein the ice maker is installed on the top of the heat exchange box, and the lost cold energy is introduced into the ice maker for utilization through a fan, thereby achieving full utilization of the LNG cold energy and reducing energy waste. At the same time, multiple groups of gasification pipes are provided in the heat exchange box, and two groups of mutually perpendicular partitions are fixedly installed inside the gasification pipe to improve the pressure bearing capacity of the gasification pipe, and multiple groups of annular wing plates are fixedly installed on the outer wall of the gasification pipe to increase its contact area with the Freon and improve its heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Schematic diagram of the system of the present invention.

[0014] Figure 2 It is a schematic diagram of the internal structure of the drying cylinder of the present invention.

[0015] Figure 3 It is a side view of the internal structure of the heat exchange box of the present invention.

[0016] Figure 4 It is a top view of the internal structure of the heat exchange box of the present invention.

[0017] Figure 5 It is a side view of the gasification tube of the present invention.

[0018] Figure 6 Schematic diagram of the separator of the present invention.

[0019] As shown in the figure: 1. LNG storage tank, 2. Freon storage tank, 3. Heat exchange box, 4. Booster pump, 5. Drying cylinder, 6. Vacuum machine, 7. Ice maker, 8. Fan, 9. LNG output pipeline, 10. Pressure-stabilizing pump, 11. Liquid inlet pipe, 12. Air inlet pipe, 13. Liquid guide pipe, 14. Air outlet pipe, 15. Liquid delivery pipe, 16. Exhaust pipe, 17. Exhaust pipe, 18. Feed hopper, 19. First diverter plate, 20. First manifold, 21. Discharge pipe, 22. Heating plate, 23. Heat exchange pipe, 24. Second diverter plate, 25. Vaporization pipe, 26. Second manifold, 27. Hollow column, 28. Partition, 29. Wing plate, 30. Guide chamber, 31. Groove, 32. Column, 33. Solenoid valve, 34. Return pipe. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "mounted / connected," and "connected" should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention in specific circumstances.

[0022] See also Figures 1 to 6In an embodiment of the present invention, a drying device utilizing cold energy for an LNG filling station includes an LNG storage tank 1, a Freon storage tank 2, a heat exchange box 3, a drying cylinder 5, a vacuum machine 6, and an ice maker 7. The output end of the LNG storage tank 1 is connected to the input end of the heat exchange box 3 through a liquid inlet pipe 11. At the same time, an air inlet pipe 12 is also installed at the input end of the heat exchange box 3 close to the liquid inlet pipe 11. The other end of the air inlet pipe 12 is connected to the output end of the Freon storage tank 2. The Freon storage tank 2 is filled with gaseous Freon, and the output end of the heat exchange box 3 is respectively connected to a liquid guide pipe 13 and an air outlet pipe 14, and the air outlet pipe 14 is connected to the LNG output pipeline network 9. Liquid LNG exchanges heat with gaseous Freon in the heat exchange box 3. After absorbing cold energy, the gaseous Freon becomes liquid Freon and is discharged into the liquid guide pipe 13 for utilization. At the same time, the other end of the liquid guide pipe 13 is fixedly installed at the input end of the booster pump 4, and the output end of the booster pump 4 is connected to the liquid guide pipe 13. The pipe 15 is connected to the drying cylinder 5, thereby introducing liquid Freon into the drying cylinder 5, where the liquid Freon is vaporized and the cold energy is released to refrigerate the material. The side wall of the drying cylinder 5 is connected to the vacuum machine 6 through the exhaust pipe 17. The vacuum machine 6 realizes vacuum drying of the material inside the drying cylinder 5, thereby utilizing the cold energy of LNG and reducing energy waste. At the same time, a fan 8 is fixedly installed at the bottom of the heat exchange box 3, and an ice maker 7 is installed above the heat exchange box 3. The bottom of the ice maker 7 is connected to the exhaust end of the fan 8. Considering that the cold energy in the LNG cannot be completely converted in the heat exchange box 3, a part of the cold energy is wasted in the air. Therefore, the fan 8 blows this part of the heat dissipated cold energy into the ice maker 7 for utilization. The ice making temperature of the ice maker 7 only needs to be -10℃ to -18℃, so this part of the cold energy fully meets the working requirements of the ice maker 7, further reducing the waste of cold energy.

[0023] See Figure 2It can be seen that: a first diverter plate 19 is fixedly installed at the bottom of the drying cylinder 5, wherein the side wall of the first diverter plate 19 is connected to the end of the liquid infusion pipe 15, and at the same time, a plurality of groups of heat exchange tubes 23 are fixedly installed on the top of the first diverter plate 19, and the heat exchange tubes 23 are connected to the interior of the diverter plate 19, so that the liquid Freon is evenly input into the heat exchange tubes 23, and the material is evenly cooled, and a first conduit plate 20 is installed on the top of the heat exchange tubes 23, and the first conduit plate 20 is fixedly installed on the inner wall of the drying cylinder 5, wherein an exhaust pipe 16 is fixedly installed on the top of the first conduit plate 20, and the other end of the exhaust pipe 16 is connected to the input end of the Freon storage tank 2, and the gaseous Freon that has been cooled is refluxed to the Freon storage tank 2 through the exhaust pipe 16 for cooling. The materials are recycled, and at the same time, a feed hopper 18 is fixedly installed on the top of the drying cylinder 5, and the bottom of the feed hopper 18 extends from the inside of the first manifold 20, so as to introduce the materials into the heat exchange tubes 23, and a discharge pipe 21 is fixedly installed on the bottom of the drying cylinder 5, and the end of the discharge pipe 21 also extends from the inside of the first diverter plate 19, so as to discharge the dried materials. The feed hopper 18 and the discharge pipe 21 are fixedly installed with a solenoid valve 33, and the feed hopper 18 and the discharge pipe 21 are sealed by the solenoid valve 33. At the same time, a plurality of heating plates 22 are fixedly installed on the bottom of the first diverter plate 19, and the built-in heating plates 22 are used to heat the materials, which has a better heating effect on the solid liquid, thereby improving the drying efficiency of the vacuum freeze-drying.

[0024] See Figures 3 to 6 It can be seen that: the heat exchange box 3 is configured as a hollow box body, and a second diverter plate 24 is fixedly installed on the right side of the interior of the heat exchange box 3, wherein the right side wall of the second diverter plate 24 and the output end of the liquid inlet pipe 11 are connected together, and multiple groups of gasification pipes 25 are fixedly installed on the left side wall of the second diverter plate 24, wherein a second convergence plate 26 is fixedly installed on the left side wall of the gasification pipe 25, and the top wall of the second convergence plate 26 and the end of the gas outlet pipe 14 are connected together to form an LNG flow channel, and the gas inlet pipe 12 and the liquid guide pipe 13 are both connected to the interior of the heat exchange box 3, thereby realizing the cold exchange operation between LNG and Freon.

[0025] Among them, two groups of partitions 28 arranged perpendicular to each other are fixedly installed inside the gasification pipe 25, and the partitions 28 divide the inside of the gasification pipe 25 into four groups of independent flow guide chambers 30. The partitions 28 are also made of heat-conducting material, thereby effectively increasing the heat exchange efficiency between the liquid and the gasification pipe 25 and reducing the contact dead angle between the liquid and the gasification pipe. At the same time, considering that the storage pressure of LNG is relatively high, the pressure bearing capacity of the gasification pipe 25 is required to be relatively high. Therefore, the thickness of the gasification pipe 25 is generally relatively thick, thereby limiting the heat exchange capacity of the gasification pipe 25. The use of two groups of staggered partitions 28 can effectively improve the heat exchange efficiency between the liquid and the gasification pipe 25. The pressure-bearing capacity of the vaporization tube greatly reduces the thickness of the vaporization tube 25 and improves its heat exchange efficiency. At the same time, multiple groups of grooves 31 are opened on the side wall of the partition 28. The contact area between the liquid and the partition is further increased by the provided grooves 31; and multiple groups of annular wing plates 29 are fixedly installed on the outer wall of the vaporization tube 25. The wing plates 29 are also made of heat-conducting material. Due to the reduction in the overall thickness of the vaporization tube 25, the contact area between it and the Freon is inevitably reduced. For this reason, we have provided multiple groups of wing plates 29 on the outer wall of the vaporization tube 25 to increase its contact area with the Freon, making the Freon liquefaction faster.

[0026] Preferably, a plurality of hollow columns 27 are fixedly installed inside the heat exchange box 3, and the two ends of the hollow columns 27 are respectively connected to the fan 8 and the ice maker 7, thereby effectively transmitting the excess cold energy dissipated during the LNG heat exchange process to the ice maker 7 for utilization.

[0027] Preferably, a pressure stabilizing pump 10 is fixedly installed inside the liquid inlet pipe 11 to stabilize the output pressure of the LNG, thereby preventing large pressure fluctuations from damaging the gasification pipe 25 and ensuring the normal operation of the cooling process.

[0028] Preferably, the liquid discharge end of the vacuum machine 6 is connected to the output end of the ice maker 7 through the return pipe 34, and the water vapor generated during the drying process is introduced into the ice maker 7 through the vacuum machine 6 to perform ice making operation, which is more energy-saving and environmentally friendly.

[0029] According to the above preferred embodiment provided by the present invention, the working steps of the present invention are: first, the material is injected into the drying cylinder 5 through the feed hopper 18, and then the LNG storage tank 1 and the pressure-stabilizing pump 10 are turned on to discharge the LNG liquid stably into the heat exchange box 3, and the gaseous Freon in the Freon storage tank 2 is also injected into the heat exchange box 3, and the LNG liquid and the gaseous Freon complete the cooling operation in the heat exchange box 3, and the liquid Freon that has completed the cooling is introduced into the heat exchange pipe 23 to cool and condense the material, and then the gaseous LNG that has completed the cooling is injected into the LNG output pipeline 9 for user use. After the material is condensed, the vacuum machine 6 and the heating plate 22 are turned on to vacuum dehumidify the material, and the water vapor in the dehumidification process is introduced into the ice maker 7 to make ice for use in the ice storage. The system has a higher cold energy utilization rate, and is used in combination with material drying and ice making, which improves the system's production capacity and has higher economic benefits.

[0030] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention, and any contents not described in detail in this specification shall belong to the prior art known to professional and technical personnel in this field.

Claims

1. A drying device utilizing cold energy for an LNG filling station, comprising an LNG storage tank (1), a Freon storage tank (2), a heat exchange box (3), a drying cylinder (5), a vacuum machine (6), and an ice maker (7), characterized in that: The output end of the LNG storage tank (1) is connected to the input end of the heat exchange box (3) through a liquid inlet pipe (11), and an air inlet pipe (12) is also installed on the input end of the heat exchange box (3) close to the liquid inlet pipe (11). The other end of the air inlet pipe (12) is connected to the output end of the Freon storage tank (2), wherein the Freon storage tank (2) is filled with gas Freon, and the output end of the heat exchange box (3) is respectively connected to a liquid guide pipe (13) and an air outlet pipe (14), and the air outlet pipe (14) is connected to the LNG output pipe network (9). At the same time, the other end of the liquid guide pipe (13) is fixedly installed at the input end of the booster pump (4), and the output end of the booster pump (4) is connected to the LNG output pipe network (9). The liquid pipe (15) and the drying cylinder (5) are connected together, and the side wall of the drying cylinder (5) is connected to the vacuum machine (6) through the exhaust pipe (17). At the same time, a fan (8) is fixedly installed at the bottom of the heat exchange box (3), and an ice maker (7) is installed above the heat exchange box (3), wherein the bottom of the ice maker (7) and the exhaust end of the fan (8) are connected together; a first diverter plate (19) is fixedly installed at the bottom of the drying cylinder (5), wherein the side wall of the first diverter plate (19) and the end of the liquid infusion pipe (15) are connected together, and multiple groups of heat exchange pipes (23) are fixedly installed on the top of the first diverter plate (19), and the heat exchange pipes (23) and the interior of the diverter plate (19) are connected together. The heat exchange box (3) is provided with a first manifold (20) mounted on the top of the heat exchange tube (23), the first manifold (20) being fixedly mounted on the inner wall of the drying cylinder (5), wherein an exhaust pipe (16) is fixedly mounted on the top of the first manifold (20), the other end of the exhaust pipe (16) being connected to the input end of the Freon storage tank (2); a plurality of hollow columns (27) are fixedly mounted inside the heat exchange box (3), the two ends of the hollow columns (27) being respectively connected to the fan (8) and the ice maker (7); the heat exchange box (3) is configured as a hollow box body, and a second manifold (24) is fixedly mounted on the right side of the interior of the heat exchange box (3), wherein the right side wall of the second manifold (24) and the liquid inlet pipe are connected. The output ends of the heat exchange box (11) are connected together, and a plurality of gasification pipes (25) are fixedly installed on the left side wall of the second diverter plate (24), wherein a second convergent plate (26) is fixedly installed on the left side wall of the gasification pipe (25), and the top wall of the second convergent plate (26) and the end of the gas outlet pipe (14) are connected together to form an LNG flow channel, and the gas inlet pipe (12) and the liquid guide pipe (13) are both connected with the interior of the heat exchange box (3); two groups of partitions (28) arranged perpendicular to each other are fixedly installed inside the gasification pipe (25), and the partitions (28) are used to divide the interior of the gasification pipe (25) into four groups of independent guide chambers (30), and the partitions (28) are also made of heat-conducting material.

2. The drying device using cold energy for an LNG filling station according to claim 1, characterized in that: A feed hopper (18) is fixedly mounted on the top of the drying cylinder (5), the bottom of which extends from the interior of the first manifold (20), and a discharge pipe (21) is fixedly mounted on the bottom of the drying cylinder (5), the end of which also extends from the interior of the first diverter plate (19), wherein a solenoid valve (33) is fixedly mounted inside the feed hopper (18) and the discharge pipe (21).

3. The drying device using cold energy for an LNG filling station according to claim 1, characterized in that: The side wall of the partition (28) is provided with a plurality of grooves (31), and the contact area between the liquid and the partition is increased by the provided grooves (31). In addition, a plurality of annular wing plates (29) are fixedly mounted on the outer wall of the vaporization tube (25), and the wing plates (29) are also made of heat-conducting material.

4. The drying device using cold energy for an LNG filling station according to claim 1, characterized in that: A pressure-stabilizing pump (10) is fixedly installed inside the liquid inlet pipe (11).

5. The drying device using cold energy for an LNG filling station according to claim 1, characterized in that: A plurality of heating plates (22) are fixedly mounted on the bottom of the first diverter plate (19).

6. The drying device using cold energy for an LNG filling station according to claim 1, characterized in that: The liquid discharge end of the vacuum machine (6) is connected to the output end of the ice maker (7) through a return pipe (34).

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