Cyclone type gas-liquid separator applied to LNG buffer tank

Abstract

The utility model is applicable to the technical field of LNG (Liquefied Natural Gas) buffer tanks, in particular to a cyclone gas-liquid separator applied to an LNG buffer tank, which comprises an LNG buffer tank main body, and a gas-liquid mixture inlet is arranged at the top of the outer side of the LNG buffer tank main body. According to the utility model, the LNG buffer tank main body consisting of the cylindrical upper half part and the truncated cone-shaped lower half part with the wide upper part and the narrow lower part, the gas discharge pipe, the gas-liquid mixture inlet and the liquid discharge pipe are arranged, so that gas-liquid separation treatment can be carried out on a gas-liquid mixture generated by gasifying the LNG by the water bath vaporizer after the LNG is gasified by the water bath vaporizer; and the LNG buffer tank main body has a unique structural design, so that the gas-liquid separation treatment effect is sufficient, ultralow-temperature liquefied natural gas can be effectively prevented from entering the composite material buffer tank to damage the composite material buffer tank, and the practical application effect of the cyclone gas-liquid separator applied to the LNG buffer tank is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of LNG buffer tanks, in particular to a cyclone type gas-liquid separator applied to LNG buffer tanks. Background Art

[0002] In the vehicle liquefied natural gas (LNG) supply system, the buffer tank plays a vital role. The buffer tank not only stabilizes the engine intake pressure and ensures the smooth operation of the engine, but also stores a certain amount of gas when the vehicle is parked to provide the necessary gas source for the next start. These buffer tanks usually need to work stably in an environment of -40 degrees Celsius to 90 degrees Celsius, and in extreme cases, withstand low temperatures of -100 to 130 degrees Celsius and a maximum pressure of 2.86 MPa.

[0003] However, conventional plastic materials cannot withstand such low temperatures, and the use of special plastic materials significantly increases the cost. Therefore, there is a large contradiction between cost efficiency and material performance in the automotive LNG supply system currently on the market. In addition, in extreme cases, liquid natural gas (a small amount of LNG that is not fully vaporized by the water bath vaporizer) may enter the buffer tank due to unexpected circumstances. At this time, if there is no effective gas-liquid separation facility, the low-temperature liquid natural gas directly enters the composite buffer tank, causing damage to the buffer tank, and further causing safety issues such as engine stalling and vehicle power loss. In this regard, the utility model provides a cyclone gas-liquid separator applied to an LNG buffer tank to solve the above-mentioned technical problems. Utility Model Content

[0004] The purpose of the embodiment of the utility model is to provide a cyclone gas-liquid separator applied to an LNG buffer tank, aiming to solve the technical problems mentioned in the background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A cyclone gas-liquid separator applied to an LNG buffer tank, comprising an LNG buffer tank body, a gas-liquid mixture inlet is arranged at the top of the outer side of the LNG buffer tank body, a gas discharge pipe is arranged in the middle area of ​​the top surface of the LNG buffer tank body, and a liquid discharge pipe is arranged in the middle area of ​​the bottom surface of the LNG buffer tank body;

[0007] The LNG buffer tank body consists of a cylindrical upper part and a truncated cone-shaped lower part which is wider at the top and narrower at the bottom.

[0008] Furthermore, a plurality of heat absorbing fins are provided on the outer sides of the LNG buffer tank body and the liquid discharge pipe.

[0009] Furthermore, one end of the liquid discharge pipe away from the LNG buffer tank body is connected to a liquid storage tank, and the volume inside the liquid storage tank is 0.5L-10L.

[0010] Furthermore, the LNG buffer tank body, the gas discharge pipe, the gas-liquid mixture inlet and the liquid discharge pipe are all made of stainless steel.

[0011] Furthermore, the heat absorbing fins are made of copper or aluminum.

[0012] An LNG supply system, comprising:

[0013] LNG storage tank, used to store LNG;

[0014] A water bath vaporizer, wherein the liquid inlet of the water bath vaporizer is connected to the liquid outlet of the LNG storage tank, and the water bath vaporizer is used for gasification treatment of LNG;

[0015] A cyclone gas-liquid separator, wherein the gas-liquid mixture inlet of the cyclone gas-liquid separator is connected to the exhaust port of the water bath vaporizer, and a pressure regulating valve is provided between the gas-liquid mixture inlet of the cyclone gas-liquid separator and the exhaust port of the water bath vaporizer, and the pressure regulating valve is used to adjust and stabilize the pressure level of the gas-liquid mixture discharged from the exhaust port of the water bath vaporizer;

[0016] A composite material buffer tank, the inlet of which is connected to the gas outlet of the cyclone gas-liquid separator, and the composite material buffer tank is used to store and buffer gaseous natural gas;

[0017] An engine, wherein an LNG inlet of the engine is connected to a gas outlet of a composite buffer tank, and a shut-off valve is provided between the LNG inlet of the engine and the gas outlet of the composite buffer tank, wherein the shut-off valve is used to control gaseous natural gas from entering the engine.

[0018] The utility model provides a cyclone gas-liquid separator applied to an LNG buffer tank, which has the following beneficial effects:

[0019] By providing an LNG buffer tank body consisting of a cylindrical upper part and a truncated cone-shaped lower part which is wider at the top and narrower at the bottom, a gas discharge pipe, a gas-liquid mixture inlet and a liquid discharge pipe, after the LNG is gasified by a water bath vaporizer, the gas-liquid mixture produced by the gasification treatment of the LNG by the water bath vaporizer can be subjected to gas-liquid separation treatment. Moreover, since the LNG buffer tank body has a unique structural design, the gas-liquid separation treatment effect is sufficient, thereby effectively preventing ultra-low temperature liquid natural gas from entering the composite material buffer tank and causing damage to the composite material buffer tank, thereby improving the actual application effect of the cyclone gas-liquid separator used for the LNG buffer tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of a cyclone gas-liquid separator used in an LNG buffer tank.

[0021] Figure 2 It is a front perspective sectional view of a cyclone gas-liquid separator used in an LNG buffer tank.

[0022] Figure 3 It is a structural schematic diagram of a cyclone gas-liquid separator used in an LNG buffer tank equipped with a liquid storage tank.

[0023] Figure 4 This is a structural schematic diagram of an LNG supply system.

[0024] In the figure: 1. LNG buffer tank body; 2. Heat absorbing fins; 3. Gas discharge pipe; 4. Gas-liquid mixture inlet; 5. Liquid discharge pipe; 6. Liquid storage tank. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0026] The specific implementation of the present utility model is described in detail below in conjunction with specific embodiments.

[0027] like Figure 1-Figure 3 As shown, the embodiment of the utility model provides a cyclone gas-liquid separator applied to an LNG buffer tank, comprising an LNG buffer tank body 1, characterized in that a gas-liquid mixture inlet 4 is provided at the top of the outer side of the LNG buffer tank body 1, and a gas discharge pipe 3 is provided in the middle area of ​​the top surface of the LNG buffer tank body 1, and a liquid discharge pipe 5 is provided in the middle area of ​​the bottom surface of the LNG buffer tank body 1;

[0028] The LNG buffer tank body 1 is composed of a cylindrical upper half and a truncated cone-shaped lower half which is wider at the top and narrower at the bottom.

[0029] In one embodiment of the utility model, the gas-liquid mixture generated by gasification treatment of LNG by a water bath vaporizer enters the interior of the LNG buffer tank body 1 axially through the gas-liquid mixture inlet 4, and because the gas-liquid mixture entering the gas-liquid mixture inlet 4 has a certain initial velocity, combined with the specific shape combination of the upper and lower parts of the LNG buffer tank body 1 (a cylindrical upper half and a truncated cone-shaped lower half that is wide at the top and narrow at the bottom), the gas-liquid mixture entering the interior of the LNG buffer tank body 1 will generate a strong rotation inside the LNG buffer tank body 1 along with the airflow, and the airflow spirals downward along the cylinder into the cyclone cylinder, and the liquid with high density is thrown onto the inner wall of the LNG buffer tank body 1 under the action of centrifugal force, and flows down along the inner wall of the LNG buffer tank body 1 to the liquid discharge pipe 5 under the action of gravity, and the rotating gaseous natural gas flow will shrink in the cylinder and flow to the center until a secondary vortex is formed upward and discharged from the LNG buffer tank body 1 through the gas discharge pipe 3, thereby completing the gas-liquid separation operation of the gas-liquid mixture generated by gasification treatment of LNG by the water bath vaporizer.

[0030] In this embodiment, a plurality of heat-absorbing fins 2 are provided on the outer sides of the LNG buffer tank body 1 and the liquid discharge pipe 5. By providing a plurality of large and thin heat-absorbing fins on the entire separator, the inner wall of the LNG buffer tank body 1 can absorb more heat from the outside. When part of the liquefied natural gas is thrown on the inner wall of the LNG buffer tank body 1, the liquefied natural gas can absorb heat and vaporize, and be discharged from the LNG buffer tank body 1 through the gas discharge pipe 3, thereby assisting in completing the gasification process of the LNG.

[0031] Through the above technical scheme, after the water bath vaporizer performs gasification treatment on the LNG, the gas-liquid mixture generated by the water bath vaporizer gasification treatment on the LNG can be subjected to gas-liquid separation treatment, and since the LNG buffer tank body 1 has a unique structural design, the gas-liquid separation treatment effect is sufficient, thereby effectively preventing ultra-low temperature liquid natural gas from entering the composite material buffer tank and causing damage to the composite material buffer tank, thereby improving the actual application effect of the cyclone gas-liquid separator applied to the LNG buffer tank;

[0032] In addition, by providing the heat-absorbing fins 2, the inner wall of the LNG buffer tank body 1 can absorb more heat from the outside. When part of the liquefied natural gas is thrown onto the inner wall of the LNG buffer tank body 1, the liquefied natural gas can absorb heat and vaporize, and be discharged from the LNG buffer tank body 1 through the gas discharge pipe 3, thereby assisting in completing the gasification process of the LNG.

[0033] In this embodiment, the end of the liquid discharge pipe 5 away from the LNG buffer tank body 1 is connected to the liquid storage tank 6, and the volume inside the liquid storage tank 6 is 0.5L-10L, so that part of the liquefied natural gas (LNG) flowing along the inner wall of the LNG buffer tank body 1 and not endothermally vaporized will flow into the interior of the liquid storage tank 6, and this part of the liquid storage tank 6 can be gradually vaporized and decomposed over time and discharged into the gas discharge pipe 3.

[0034] In this embodiment, the LNG buffer tank body 1, the gas discharge pipe 3, the gas-liquid mixture inlet 4 and the liquid discharge pipe 5 are all made of stainless steel, and the heat-absorbing fins 2 are made of copper or aluminum. By making the LNG buffer tank body 1, the gas discharge pipe 3, the gas-liquid mixture inlet 4 and the liquid discharge pipe 5 of stainless steel, the stability and service life of the entire separator structure can be improved. By making the heat-absorbing fins 2 of copper or aluminum, the heat-absorbing fins 2 have good heat absorption and thermal conductivity properties.

[0035] like Figure 4 As shown, an LNG supply system, the LNG supply system comprises:

[0036] LNG storage tank, used to store LNG;

[0037] A water bath vaporizer, the liquid inlet of the water bath vaporizer is connected to the liquid outlet of the LNG storage tank, and the water bath vaporizer is used for gasification treatment of LNG;

[0038] A cyclone gas-liquid separator, wherein the gas-liquid mixture inlet of the cyclone gas-liquid separator is connected to the exhaust port of the water bath vaporizer, and a pressure regulating valve is provided between the gas-liquid mixture inlet of the cyclone gas-liquid separator and the exhaust port of the water bath vaporizer, and the pressure regulating valve is used to adjust and stabilize the pressure level of the gas-liquid mixture discharged from the exhaust port of the water bath vaporizer;

[0039] A composite material buffer tank, the inlet of the composite material buffer tank is connected to the gas outlet of the cyclone gas-liquid separator, and the composite material buffer tank is used to store and buffer gaseous natural gas;

[0040] The engine, the LNG inlet of the engine is connected with the gas outlet of the composite buffer tank, and a stop valve is arranged between the LNG inlet of the engine and the gas outlet of the composite buffer tank, and the stop valve is used to control the gaseous natural gas to enter the engine.

[0041] In this embodiment, by setting a pressure-stabilizing valve, the gas-liquid mixture produced by the gasification treatment of LNG in the water bath vaporizer can enter the cyclone gas-liquid separator with a special structure at a stable pressure and speed, so that the gas-liquid mixture entering the cyclone gas-liquid separator can form a cyclone shape regularly and stably, thereby achieving an efficient gas-liquid separation effect.

[0042] Compared with the existing technology, the above-mentioned LNG supply system can, on the one hand, prevent ultra-low temperature liquid natural gas (LNG) from entering the composite buffer tank and causing damage to the composite buffer tank; on the other hand, it can also enable the liquefied natural gas to be fully gasified and put into use in the engine, thereby greatly improving the overall safety and efficiency of the LNG supply system.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A cyclone gas-liquid separator for an LNG buffer tank, comprising an LNG buffer tank body (1), characterized in that: A gas-liquid mixture inlet (4) is provided at the top of the outer side of the LNG buffer tank body (1), a gas discharge pipe (3) is provided in the middle area of ​​the top surface of the LNG buffer tank body (1), and a liquid discharge pipe (5) is provided in the middle area of ​​the bottom surface of the LNG buffer tank body (1); The LNG buffer tank body (1) consists of a cylindrical upper part and a truncated cone-shaped lower part which is wider at the top and narrower at the bottom.

2. The cyclone gas-liquid separator used in an LNG buffer tank according to claim 1, characterized in that: A plurality of heat-absorbing fins (2) are provided on the outer sides of the LNG buffer tank body (1) and the liquid discharge pipe (5).

3. The cyclone gas-liquid separator used in an LNG buffer tank according to claim 1, characterized in that: One end of the liquid discharge pipe (5) away from the LNG buffer tank body (1) is connected to a liquid storage tank (6), and the volume inside the liquid storage tank (6) is 0.5L-10L.

4. The cyclone gas-liquid separator used in an LNG buffer tank according to claim 1, characterized in that: The LNG buffer tank body (1), the gas discharge pipe (3), the gas-liquid mixture inlet (4) and the liquid discharge pipe (5) are all made of stainless steel.

5. The cyclone gas-liquid separator used in an LNG buffer tank according to claim 2, characterized in that: The heat absorbing fins (2) are made of copper or aluminum.

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