Skid-mounted LNG (Liquefied Natural Gas) two-pump four-machine filling device
By combining components such as protective boxes, ventilation pipes, and corrugated condenser plates, and utilizing liquid nitrogen atomization and heat exchange to reduce air humidity, the humidity control problem of skid-mounted LNG refueling units in low-temperature environments is solved, achieving both equipment safety and convenience.
Patent Information
- Application Number
- CN202422655966.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-01
- Publication Date
- 2025-10-31
- Estimated Expiration
- 2034-11-01
AI Technical Summary
Existing skid-mounted LNG refueling units face difficulties in controlling pipeline humidity in low-temperature environments, leading to frequent equipment corrosion and mechanical failures. Traditional humidity control methods are ineffective or increase operating costs in high-humidity environments.
It adopts a combination design of protective box, ventilation pipe, corrugated condenser plate, dehumidification box, liquid nitrogen storage tank, heat exchange box and atomizer. It reduces air humidity through liquid nitrogen atomization and heat exchange, and combines with automatic pressure relief valve to prevent excessive pressure, so as to achieve active dehumidification and protection.
It effectively controls pipeline humidity, reduces equipment corrosion and malfunctions, lowers operating costs, improves gas refueling efficiency and safety, and is easy to operate.
Smart Images
Figure CN223499311U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of skid-mounted gas station technology, specifically a skid-mounted LNG two-pump four-machine gas refueling device. Background Technology
[0002] In LNG (liquefied natural gas) refueling stations, skid-mounted refueling units are widely used due to their compact structure and ease of transportation and installation. However, these units often face a challenge during operation: humidity control of the control pipelines and their surrounding environment. When LNG is transferred from the storage tank to the refueling machine through a complex control pipeline system (including pumps, vaporizers, pipes, and sophisticated control systems), the temperature of the control pipelines drops rapidly due to the extreme low temperature of LNG. During this temperature change, a large amount of water vapor in the surrounding air condenses quickly into liquid water or even frost on the cooler pipeline surface. If this condensed moisture is not effectively removed in time, it will gradually accumulate on critical components such as control pipelines and valves, not only exacerbating the risk of equipment corrosion but also potentially leading to frequent mechanical failures, seriously affecting refueling efficiency and overall operational safety.
[0003] Traditionally, humidity control methods have focused on two main strategies: passive dehumidification using desiccants and active dehumidification by increasing ventilation. However, both methods have limitations in specific environments. Especially in high-humidity regions like southern my country, the high humidity in the air makes simply increasing ventilation ineffective, as the incoming outside air itself contains a significant amount of moisture. While passive dehumidification using desiccants can alleviate the problem to some extent, the frequent desiccant replacements increase operating costs, reduce operational convenience, and negatively impact the long-term stable operation of gas stations. Utility Model Content
[0004] To address the shortcomings of existing humidity control methods, this invention provides a skid-mounted LNG two-pump four-machine refueling device.
[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:
[0006] This utility model relates to a skid-mounted LNG two-pump four-machine refueling device, comprising a skid-mounted box. A storage tank is installed on one side of the bottom wall of the skid-mounted box. Four refueling machines are installed in a rectangular arrangement on the side of the bottom wall of the skid-mounted box away from the storage tank. A control pipeline for transferring LNG from the storage tank to the refueling machines is installed between the storage tank and the four refueling machines inside the skid-mounted box. A protective box for protecting the control pipeline is installed on the side of the bottom wall of the skid-mounted box near the control pipeline. Dehumidification components for reducing the humidity of the air inside the protective box are installed on both sides of the outer wall of the protective box.
[0007] The dehumidification component includes a ventilation duct connecting the internal space of the protective box and the external space of the skid-mounted box. A corrugated condenser plate is uniformly arranged along the width direction of the ventilation duct at the center of the inner side wall of the ventilation duct. A dehumidification box is arranged inside the ventilation duct near the protective box. A cooling component for cooling the corrugated condenser plate is arranged on the top of the protective box.
[0008] As a preferred technical solution of this utility model, the cooling component includes a liquid nitrogen storage tank fixedly connected to the top of the protective box and a heat exchange box fixedly connected to the upper surface of the ventilation pipe near the corrugated condenser plate. The top of the corrugated condenser plate penetrates the top of the ventilation pipe and the bottom of the heat exchange box and is located inside the heat exchange box. An atomizer connected to the liquid nitrogen storage tank is provided on one side of the inner wall of the heat exchange box. A heat exchange liquid is provided inside the heat exchange box, and the liquid level of the heat exchange liquid is lower than the atomizer and higher than the top of the corrugated condenser plate.
[0009] As a preferred technical solution of this utility model, a baffle ring is provided on the side of the inner wall of the ventilation pipe near the protective box.
[0010] As a preferred technical solution of this utility model, an inclined drain pipe is provided at the bottom of the ventilation pipe near the corrugated condenser plate, and the two ends of the inclined drain pipe are respectively connected to the inside of the ventilation pipe and the outside of the skid-mounted box.
[0011] As a preferred embodiment of this utility model, a filter screen is provided on the inner wall of the ventilation duct near the skid-mounted box, and a fan is provided on the inner wall of the ventilation duct between the corrugated condenser plate and the filter screen.
[0012] As a preferred embodiment of this utility model, an automatic pressure relief valve connected to the internal space of the heat exchange box is provided on one side of the outer wall of the heat exchange box.
[0013] The beneficial effects of this utility model are:
[0014] 1. This skid-mounted LNG two-pump four-machine refueling unit, through the cooperation of a protective box, ventilation pipe, corrugated condenser plate, dehumidifier box, liquid nitrogen storage tank, heat exchange box, atomizer and heat exchange fluid, allows the atomizer to be turned on while the vehicle's gas box is being inspected when refueling a vehicle. The liquid nitrogen in the liquid nitrogen storage tank is atomized and introduced into the heat exchange box to exchange heat with the corrugated condenser plate through the heat exchange fluid. As the air passes through the corrugated condenser plate, the moisture in the air condenses on the surface of the corrugated condenser plate, reducing the air humidity. After condensation, the air with reduced humidity flows back into the protective box to control the air humidity around the control pipeline, preventing the moisture in the air from quickly condensing into liquid water or even frost on the pipeline surface, which would affect the safety of equipment operation. Moreover, it can be used for a long time again by simply adding nitrogen to the liquid nitrogen storage tank after a long period of use, making the operation more convenient.
[0015] 2. This skid-mounted LNG two-pump four-machine refueling unit, through the setting of an automatic pressure relief valve, after the liquid nitrogen and heat exchange liquid have exchanged heat, the liquid nitrogen itself vaporizes, and the pressure inside the heat exchange box continues to rise. The automatic pressure relief valve can release the vaporized nitrogen in the heat exchange box to release pressure when the pressure inside the heat exchange box is too high, thereby avoiding excessive pressure inside the heat exchange box and causing deformation of the heat exchange box body.
[0016] 3. This skid-mounted LNG two-pump four-machine refueling unit, by setting the condenser plate to a corrugated shape, can maximize the contact area between the condenser plate and the air within a limited space, thereby improving the condensation effect of the condenser plate on the moisture in the air. Attached Figure Description
[0017] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:
[0018] Figure 1 This is a three-dimensional structural diagram of the skid-mounted LNG two-pump four-machine refueling device of this utility model;
[0019] Figure 2 This is a three-dimensional sectional view of the skid-mounted LNG two-pump four-machine refueling device of this utility model;
[0020] Figure 3 This is a schematic diagram of the main sectional view of the skid-mounted LNG two-pump four-machine refueling device of this utility model;
[0021] Figure 4 This is a schematic diagram of the corrugated condenser plate structure of the skid-mounted LNG two-pump four-machine refueling device of this utility model.
[0022] In the diagram: 1. Skid-mounted container; 2. Storage tank; 3. Gas dispenser; 4. Control pipeline; 5. Protective box; 6. Ventilation pipe; 7. Corrugated condenser plate; 8. Dehumidifier box; 9. Liquid nitrogen storage tank; 10. Heat exchanger box; 11. Atomizer; 12. Heat exchange fluid; 13. Baffle ring; 14. Upper drain outlet; 15. Inclined drain plate; 16. Lower drain outlet; 17. Filter screen; 18. Fan; 19. Automatic pressure relief valve. Detailed Implementation
[0023] The following is in conjunction with the appendix Figure 1-4 The preferred embodiments of the present invention will be described herein. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.
[0024] Reference Figure 1 , Figure 2 and Figure 3This utility model relates to a skid-mounted LNG two-pump four-machine refueling device, which includes a skid-mounted box 1. A storage tank 2 is installed on one side of the bottom wall of the skid-mounted box 1. Four refueling machines 3 are installed on the side of the bottom wall of the skid-mounted box 1 away from the storage tank 2. A control pipeline 4 for transferring LNG in the storage tank 2 to the refueling machines 3 is installed in the skid-mounted box 1 between the storage tank 2 and the four refueling machines 3. The control pipeline 4 includes two pump pools, a vaporizer, a pipe and a control system connected to both the refueling machines 3 and the storage tank 2. A protective box 5 for protecting the control pipeline 4 is installed on the side of the bottom wall of the skid-mounted box 1 near the control pipeline 4. Dehumidification components for reducing the humidity of the air inside the protective box 5 are installed on both sides of the outer wall of the protective box 5.
[0025] Reference Figure 2 , Figure 3 and Figure 4 The dehumidification component includes a ventilation duct 6 connecting the internal space of the protective box 5 and the external space of the skid-mounted box 1. The air inside the protective box 5 and the external space of the skid-mounted box 1 are connected through the ventilation duct 6. A corrugated condenser plate 7 is uniformly arranged along the width direction of the ventilation duct 6 at the center of the inner wall of the ventilation duct 6. By setting the condenser plate to a corrugated shape, the contact area between the corrugated condenser plate 7 and the air can be maximized within a limited space, thereby improving the condensation effect of the condenser plate on the moisture in the air. A filter screen 16 is provided on the inner wall of the ventilation duct 6 near the skid-mounted box 1. The filter screen 16 can minimize the entry of dust into the ventilation duct 6 and its adhesion to the surface of the corrugated condenser plate 7. A fan 17 is provided on the inner wall of the ventilation duct 6 between the corrugated condenser plate 7 and the filter screen 16. The atomizer 10 and the fan 17 are both electrically connected to the control panel (not shown in the figure). The fan 17 can drive the air inside the protective box 5 and the external space of the skid-mounted box 1 to actively circulate through the ventilation duct 6.
[0026] Reference Figure 2 and Figure 3 The top of the protective box 5 is equipped with a cooling component for cooling the corrugated condenser plate 7. The cooling component includes a liquid nitrogen storage tank 8 fixedly connected to the top of the protective box 5 and a heat exchange box 9 fixedly connected to the upper surface of the ventilation pipe 6 near the corrugated condenser plate 7. The top of the corrugated condenser plate 7 passes through the top of the ventilation pipe 6 and the bottom of the heat exchange box 9 and is located inside the heat exchange box 9. An atomizer 10 connected to the liquid nitrogen storage tank 8 is provided on one side of the inner wall of the heat exchange box 9.
[0027] The heat exchange box 9 is equipped with a heat exchange fluid 11, which is a propylene glycol aqueous solution. Since the propylene glycol aqueous solution can remain liquid at low temperatures, it can prevent the heat exchange fluid 11 from solidifying during the heat exchange with liquid nitrogen. The non-volatile and non-toxic properties of the propylene glycol aqueous solution also ensure safety during use. At the same time, the heat exchange efficiency between the heat exchange fluid 11 and the corrugated condenser plate 7 can be adjusted by adjusting the concentration of the propylene glycol aqueous solution. The liquid level of the heat exchange fluid 11 is lower than that of the atomizer 10 and higher than the top of the corrugated condenser plate 7.
[0028] When the gas dispenser 3 needs to be activated for gas refueling, the fan 17 is turned on first. Outside air enters the protective box 5 through the ventilation pipe 6 on one side of the protective box 5. At the same time, the air inside the protective box 5 is discharged through the ventilation pipe 6 on the other side of the protective box 5. When the air enters the protective box 5 through one of the ventilation pipes 6, the atomizer 10 atomizes the liquid nitrogen in the liquid nitrogen storage tank 8 and introduces it into the heat exchange box 9. The atomized liquid nitrogen exchanges heat with the heat exchange liquid 11 in the heat exchange box 9 and then cools the corrugated condenser plate 7 through the heat exchange liquid 11. At this time, when the air passes through the corrugated condenser plate 7, the moisture in the air condenses on the surface of the corrugated condenser plate 7, thereby reducing the air humidity. An automatic pressure relief valve 18 is provided on one side of the outer wall of the heat exchange box 9 and is connected to the internal space of the heat exchange box 9. After the liquid nitrogen exchanges heat with the heat exchange liquid 11, it vaporizes, and the pressure inside the heat exchange box 9 rises. The automatic pressure relief valve 18 can minimize the risk of excessive pressure inside the heat exchange box 9, which could cause deformation of the heat exchange box 9.
[0029] Reference Figure 2 A baffle ring 12 is provided around the inner wall of the ventilation duct 6 near the protective box 5. The baffle ring 12 can prevent water droplets condensed on the corrugated condenser plate 7 from flowing into the protective box 5 through the inner bottom wall of the ventilation duct 6. The bottom of the ventilation duct 6 is evenly provided with upper drain outlets 13. The two sides of the inner bottom wall of the skid box 1 are provided with inclined drain plates 14 below the ventilation duct 6. The bottom of the two sides of the inner wall of the skid box 1 is provided with lower drain outlets 15. When the moisture in the air condenses on the corrugated condenser plate 7, it will fall under the action of gravity, and then fall through the upper drain outlet 13 to the surface of the inclined drain plate 14. Then it will be guided by the inclined drain plate 14 to the lower drain outlet 15 and discharged from the skid box 1 through the lower drain outlet 15.
[0030] The working principle of this utility model is as follows: When the gas dispenser 3 is needed to refuel the vehicle, while checking the vehicle's gas box, the atomizer 10 is turned on to atomize the liquid nitrogen in the liquid nitrogen storage tank 8 and introduce it into the heat exchange box 9 to exchange heat with the heat exchange liquid 11. After exchanging heat with the liquid nitrogen, the heat exchange liquid 11 exchanges heat with the corrugated condenser plate 7, thereby making the temperature of the corrugated condenser plate 7 lower than the air temperature. Then, the fan 17 is turned on, and the outside air enters the interior of the protective box 5 through the ventilation pipe 6 set on one side of the protective box 5. At the same time, the air inside the protective box 5 is discharged through the ventilation pipe 6 set on the other side of the protective box 5.
[0031] When air enters the protective box 5 through one of the ventilation pipes 6, the air passes through the corrugated condenser plate 7 and the moisture in the air condenses on the surface of the corrugated condenser plate 7, thereby reducing the air humidity. After condensation, the air with reduced humidity flows back into the protective box 5. After the moisture in the air condenses on the corrugated condenser plate 7, it will fall due to gravity and then fall through the upper drain port 13 to the surface of the inclined drain plate 14. It will then be guided through the inclined drain plate 14 to the lower drain port 15 and discharged from the skid box 1 through the lower drain port 15.
[0032] After the liquid nitrogen and the heat exchange liquid 11 have exchanged heat, the liquid nitrogen vaporizes itself, and the pressure inside the heat exchange box 9 continues to rise. The automatic pressure relief valve 18 can release the vaporized nitrogen inside the heat exchange box 9 to release the pressure when the pressure inside the heat exchange box 9 is too high, thereby avoiding excessive internal pressure in the heat exchange box 9 and causing deformation of the heat exchange box 9.
[0033] After the device finishes refueling the vehicle, the temperature of the heat exchange fluid 11 and the air is gradually restored to the ambient temperature through the continuous bidirectional heat exchange between the corrugated condenser plate 7 and the heat exchange fluid 11 and the air. When the vehicle is refueled again by the gas dispenser 3, the atomizer 10 adds atomized liquid nitrogen to the heat exchange box 9 to cool down the heat exchange fluid 11 and the corrugated condenser plate 7 again and condense the circulating air to reduce the air humidity.
[0034] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A skid-mounted LNG two-pump four-machine refueling unit, comprising a skid-mounted container (1), characterized in that: A storage tank (2) is provided on one side of the bottom wall of the skid-mounted container (1). Four gas dispensers (3) are arranged in a rectangular pattern on the side of the bottom wall of the skid-mounted container (1) away from the storage tank (2). A control pipeline (4) for transferring LNG in the storage tank (2) to the gas dispensers (3) is provided between the storage tank (2) and the four gas dispensers (3) in the skid-mounted container (1). A protective box (5) for protecting the control pipeline (4) is provided on the side of the bottom wall of the skid-mounted container (1) close to the control pipeline (4). Dehumidification components for reducing the humidity of the air inside the protective box (5) are provided on both sides of the outer wall of the protective box (5). The dehumidification component includes a ventilation pipe (6) that connects the internal space of the protective box (5) and the external space of the skid-mounted box (1). A corrugated condenser plate (7) is uniformly arranged along the width direction of the ventilation pipe (6) at the center of the inner side wall of the ventilation pipe (6). A cooling component for cooling the corrugated condenser plate (7) is provided on the top of the protective box (5).
2. The skid-mounted LNG two-pump four-machine refueling device according to claim 1, characterized in that: The cooling assembly includes a liquid nitrogen storage tank (8) fixedly connected to the top of the protective box (5) and a heat exchange box (9) fixedly connected to the upper surface of the ventilation pipe (6) near the side of the corrugated condenser plate (7). The top of the corrugated condenser plate (7) passes through the top of the ventilation pipe (6) and the bottom of the heat exchange box (9) and is located inside the heat exchange box (9). An atomizer (10) connected to the liquid nitrogen storage tank (8) is provided on one side of the inner wall of the heat exchange box (9). A heat exchange liquid (11) is provided inside the heat exchange box (9). The liquid level of the heat exchange liquid (11) is lower than that of the atomizer (10) and higher than that of the top of the corrugated condenser plate (7).
3. The skid-mounted LNG two-pump four-machine refueling device according to claim 1, characterized in that: A baffle ring (12) is provided on the side of the inner wall of the ventilation pipe (6) near the protective box (5).
4. The skid-mounted LNG two-pump four-machine refueling device according to claim 1, characterized in that: The bottom of the ventilation pipe (6) is evenly provided with upper drain outlets (13), the two sides of the inner bottom wall of the skid box (1) are provided with inclined drain plates (14) below the ventilation pipe (6), and the bottom of the two sides of the inner side wall of the skid box (1) is provided with lower drain outlets (15).
5. The skid-mounted LNG two-pump four-machine refueling device according to claim 2, characterized in that: A filter screen (16) is provided on the inner wall of the ventilation pipe (6) near the skid box (1), and a fan (17) is provided on the inner wall of the ventilation pipe (6) between the corrugated condenser plate (7) and the filter screen (16).
6. The skid-mounted LNG two-pump four-machine refueling device according to claim 2, characterized in that: An automatic pressure relief valve (18) is provided on one side of the outer wall of the heat exchange box (9) and is connected to the internal space of the heat exchange box (9).