Spiral air temperature gasifier for LNG (Liquefied Natural Gas) filling station

Abstract

The utility model is applied to the fields of LNG (Liquefied Natural Gas) filling station tank car, storage tank gasification pressurization, LNG point supply, other low-temperature liquid gasification pressurization equipment and the like, relates to gasification pressurization of equipment and process systems, in particular to a novel air temperature type vaporizer device, and aims to solve the problems that an existing star-shaped fin air temperature type vaporizer is easy to frost and freeze, low in heat dissipation efficiency, low in cost and the like. And a series of potential safety hazards and the like are caused. The device comprises a fixed base, a support, a connecting piece, an inlet connector, an outlet connector, a heat conduction pipe, a coating with low ice adhesive force, an inlet valve, an outlet valve, a hanging ring and universal wheels.

Description

Technical Field

[0001] The utility model is applied to the fields of LNG point supply and LNG filling station project construction, and relates to temperature and pressure test of equipment and process system, and is specifically a spiral air-temperature gasifier for LNG filling station. Background Art

[0002] The air-temperature gasifier at the LNG filling station is the main equipment for pressurizing tank trucks and storage tanks. It is crucial and indispensable in the unloading system, daily pressurization, saturation adjustment and pressure and temperature increase of the filling system.

[0003] The air-temperature vaporizer converts the liquid natural gas (-162℃) in the tank trucks and storage tanks of the LNG filling station into gas through heat exchange with the outside world, and then reversely inputs it into the LNG tank trucks and storage tanks, so that the pressure in the tank trucks and storage tanks increases to the pressure value for safe operation of the equipment.

[0004] At present, the air-temperature gasifiers on the market are composed of multiple finned tubes of the same form in parallel. Each finned tube is a star-shaped structure, consisting of 8 or 12 fins. The tubes are mostly made of low-temperature aluminum alloy. The gasifiers in LNG filling stations are mainly horizontal. The natural convection air in the atmospheric environment is used as the heat source, and the aluminum finned tubes with good thermal conductivity exchange heat with the air to achieve the gasification function.

[0005] In winter or in an environment with low temperature and high humidity, the gasification process is prone to the following problems due to factors such as large sales volume at the station, long operation time of the gasifier, and poor ventilation:

[0006] 1. It absorbs heat and produces a large amount of white mist, which increases the humidity of the surrounding air. In severe cases, it affects the gas filling or liquid unloading operations and endangers personal safety.

[0007] 2. Frost and ice appear on the fins, causing uneven force on the vaporizer and lateral tension. In severe cases, the pipeline will rupture and gas will leak.

[0008] 3. The thermal resistance of the frost layer on the fins gradually increases, affecting the heat transfer performance (vaporization efficiency) of the vaporizer. In severe cases, the machine must be shut down for defrosting, which poses a risk of station shutdown.

[0009] 4. The temperature gradient and surface tensile stress of the equipment foundation will cause cracks in the concrete foundation, and in severe cases, it will tilt or shift.

[0010] 5. In traditional star-shaped heat pipes, water vapor is easily formed between the fins and the heat pipes above the horizontal direction, which leads to frost and ice, ultimately reducing the heat dissipation rate and posing a hidden danger.

[0011] In order to ensure the normal use of the vaporizer, chemical, heating and mechanical de-icing methods are usually adopted. Most of them are based on knocking de-icing, but it is very easy to cause damage to the vaporizer fins and pipelines. A very small number of them also add water bath heat exchangers as supplementary heat sources, but the expected effect is not obvious, especially in the northern region. Utility Model Content

[0012] The utility model provides a spiral air-temperature gasifier for an LNG filling station, aiming to solve the technical problems of easy frost and ice formation and low gasification rate of the existing air-temperature gasifier.

[0013] In order to achieve the above purpose, the technical solution of the utility model is:

[0014] A spiral air-temperature vaporizer for LNG filling stations, which is special in that it includes a fixed base, a bracket, a connector, an inlet joint, an outlet joint, a heat conducting pipe, a coating with low ice adhesion, an inlet valve, an outlet valve, a lifting ring, and a universal wheel;

[0015] The connector is arranged between the heat conducting tubes and is scissor-shaped, which can enhance the stability between the heat conducting tubes and facilitate the heat transfer between the adjacent heat conducting tubes, thereby accelerating the heat dissipation of the middle heat conducting tube;

[0016] The bracket is arranged outside the heat conducting pipe and is composed of a plurality of rectangular frames for fixing each group of heat conducting pipes;

[0017] The inlet joint is arranged at the inlet of the heat conducting pipe, and the pipe diameter is larger than the diameter of the heat conducting pipe, which can meet the simultaneous input of multiple heat conducting pipes and accelerate the gasification rate; an inlet stop valve is installed at the inlet joint;

[0018] The outlet joint is arranged at the outlet of the heat conducting pipe, and the pipe diameter is larger than the diameter of the heat conducting pipe, which can meet the synchronous output of multiple heat conducting pipes and accelerate the gasification rate; an outlet stop valve is installed at the outlet joint;

[0019] The heat pipe is a spiral fin heat pipe with high heat exchange rate. Compared with the traditional star-shaped heat pipe, the spiral fin heat pipe has a larger contact area and more efficient heat dissipation. The spiral structure reduces the adhesion of water and ice. The material is aluminum alloy with high heat exchange rate.

[0020] Furthermore, the coating with low ice adhesion is applied to the surface of the spiral fin heat pipe with high heat exchange rate and the surface of the connector, inlet joint and outlet joint;

[0021] Furthermore, the dedicated fixed base includes a rectangular frame and arc-shaped ribs arranged on the rectangular frame. The bottom of the rectangular frame is provided with four universal wheels, and the four universal wheels are respectively installed at the four corners of the rectangular frame.

[0022] Furthermore, two pull rings are respectively installed on two opposite sides of the dedicated fixed base.

[0023] Furthermore, the bracket is provided with six lifting rings, which are respectively located at the four corners of the top of the bracket and at both ends of the middle bracket.

[0024] The beneficial effects of the utility model are:

[0025] 1. The utility model is a spiral air temperature vaporizer for LNG filling stations. During the process of pressurizing tank trucks and storage tanks, the heat pipe is a spiral fin heat pipe with a high heat exchange rate to dissipate heat and increase pressure. In terms of structure, (1) the contact area between the spiral fin and the heat pipe is larger, and the heat dissipation efficiency is higher; (2) the spiral fin is a spiral curved surface structure. While increasing the contact angle, it reduces the adhesion of ice and water, and the heat dissipation efficiency is higher. Therefore, the gasification rate of the station is improved, and safe operation is ensured.

[0026] 2. The low ice adhesion coating is applied to the surface of the spiral fin heat pipe with high heat exchange rate and the surface of the connectors, inlet joints, and outlet joints. Based on the purpose of fast and efficient de-icing of aircraft, the low ice adhesion coating is designed and prepared to achieve lower (even ultra-low) ice layer adhesion strength.

[0027] 3. There are six lifting rings on the bracket, which are located at the four corners of the top of the bracket and both ends of the middle bracket, to facilitate the lifting and movement of the entire device during the assembly process.

[0028] 4. The connector is set between the heat pipes and is scissor-shaped, which can enhance the stability between the heat pipes, and at the same time help the heat transfer between the adjacent heat pipes and accelerate the heat dissipation of the middle heat pipe.

[0029] 5. There are four universal wheels at the bottom of the rectangular frame of the fixed base, and two pull rings are installed on the opposite sides to facilitate assembly and transportation in the later stage due to uncertain factors. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a three-dimensional structural diagram from one perspective of a spiral air-temperature vaporizer for an LNG filling station according to an embodiment of the utility model.

[0031] In the figure: 1-fixed base, 2-bracket, 3-connecting piece, 4-inlet joint, 5-outlet joint, 6-heat conduction pipe, 7-coating with low ice adhesion, 8-inlet valve, 9-outlet valve, 10-lifting ring, 11-universal wheel. DETAILED DESCRIPTION

[0032] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. The following embodiments are used to illustrate the utility model but are not used to limit the scope of the utility model.

[0034] See also Figure 1 A spiral air-temperature vaporizer for an LNG filling station is characterized by comprising a fixed base 1, a bracket 2, a connector 3, an inlet joint 4, an outlet joint 5, a heat pipe 6, a coating with low ice adhesion 7, an inlet valve 8, an outlet valve 9, a lifting ring 10, and a universal wheel 11.

[0035] A spiral air temperature vaporizer support 2 for an LNG filling station is arranged on a fixed base 1. A heat conducting pipe 6 is arranged in the support 2. A connector 3 is arranged between each heat conducting pipe 6. An inlet joint 4 is connected to the inlet of the heat conducting pipe 6, and an outlet joint 5 is connected to the outlet of the heat conducting pipe 6; and corresponding inlet valves 8 and outlet valves 9 are respectively installed; a lifting ring 10 is arranged on the top of the support 2. The heat conducting pipe 6 is made of an aluminum alloy with a high heat exchange rate, and the structure is spiral. The connector 3 is a scissor type, which increases the stability of the structure and accelerates the heat dissipation between the pipes. The material is an aluminum alloy with a high heat exchange rate. A coating 7 with low ice adhesion is applied to the surface of the spiral fin heat conducting pipe 6 with a high heat exchange rate and the surfaces of the connector 3, the inlet joint 4, and the outlet joint 5. The fixed base 1 includes a rectangular frame and ribs arranged on the rectangular frame. Four universal wheels 11 are arranged at the bottom of the rectangular frame, and the four universal wheels 11 are respectively installed at the four corners of the rectangular frame. Six lifting rings 10 are arranged on the support 2, which are respectively located at the four corners of the top of the support 2 and at both ends of the middle support.

[0036] Working principle of the utility model: The air-temperature gasifier of the LNG filling station is the main equipment for completing the pressurization of tank trucks and storage tanks. It is crucial and indispensable in the unloading system, daily pressurization and saturation adjustment, and pressure and temperature increase of the filling system.

[0037] The air-temperature vaporizer converts the liquid natural gas (-162℃) in the tank trucks and storage tanks of the LNG filling station into gas through heat exchange with the outside world, and then reversely inputs it into the LNG tank trucks and storage tanks, so that the pressure in the tank trucks and storage tanks increases to the pressure value for safe operation of the equipment.

[0038] See also Figure 1 A spiral air-temperature vaporizer for LNG filling stations is installed in LNG filling station pump skids, BOG skids, LNG point-supply gasification skids and other low-temperature liquid gasification equipment. During use, the low-temperature liquid output end of the equipment is connected to the device inlet connector 4, and the input end is connected to the device outlet connector 5. The inlet valve 8 and the outlet valve 9 are normally open during use, so that the function of gasification and pressurization can be realized, and it can play a role in various equipment.

[0039] It should be noted that the above is only a preferred embodiment of the present invention. For ordinary technicians in this field, several modifications and improvements can be made without departing from the creative concept of the present invention, which all fall within the protection scope of the present invention.

Claims

1. A spiral air-temperature vaporizer for an LNG filling station, characterized in that: The invention comprises a fixed base (1), a bracket (2), a connecting piece (3), an inlet joint (4), an outlet joint (5), a heat conducting pipe (6), a coating (7) with low ice adhesion, an inlet valve (8), an outlet valve (9), a lifting ring (10), and a universal wheel (11). The bracket (2) is arranged on the fixed base (1), the heat conducting pipe (6) is arranged in the bracket (2), the connecting piece (3) is arranged between each heat conducting pipe (6), the inlet joint (4) is connected to the inlet of the heat conducting pipe (6), and the outlet joint (5) is connected to the outlet of the heat conducting pipe (6); and the corresponding inlet valve (8) and outlet valve (9) are respectively installed; the lifting ring (10) is arranged on the top of the bracket (2), and the bracket (2) is provided with six lifting rings (10), which are respectively located at the top of the bracket (2) and the outlet valve (9). The four corners and both ends of the middle bracket are used in BOG skids and pump skids in LNG filling stations, and are also suitable for natural gas point supply equipment and low-temperature liquid factories that require pressurization. The heat pipe (6) is made of aluminum alloy with high heat exchange rate and adopts a spiral structure. The connector (3) adopts a scissor type to increase the stability of the structure and accelerate the heat dissipation between pipes. The material is aluminum alloy with high heat exchange rate. The coating (7) with low ice adhesion is applied to the surface of the spiral fin heat pipe (6) with high heat exchange rate and the surface of the connector (3), the inlet joint (4), and the outlet joint (5). The special fixed base (1) includes a rectangular frame and ribs arranged on the rectangular frame. Four universal wheels (11) are arranged at the bottom of the rectangular frame. The four universal wheels (11) are respectively installed at the four corners of the rectangular frame.

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