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LNG (liquefied natural gas) pump-free air-entrapping method with BOG (boil off gas) recycling function and LNG pump-free air-entrapping device

A technology of function and equipment, which is applied in the field of liquid natural gas refilling, can solve the problems of increasing operating costs and achieve the effects of reducing operation and maintenance costs, saving power consumption, and reducing investment and maintenance costs

Active Publication Date: 2011-08-17
成都深冷科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the system does not have a BOG recycling device, in order to ensure the safety of the system operation, the excess BOG produced by the system can only be released, resulting in an increase in operating costs

Method used

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  • LNG (liquefied natural gas) pump-free air-entrapping method with BOG (boil off gas) recycling function and LNG pump-free air-entrapping device
  • LNG (liquefied natural gas) pump-free air-entrapping method with BOG (boil off gas) recycling function and LNG pump-free air-entrapping device
  • LNG (liquefied natural gas) pump-free air-entrapping method with BOG (boil off gas) recycling function and LNG pump-free air-entrapping device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Such as image 3 As shown, the LNG pumpless refueling equipment with BOG recovery function includes the following components: LNG refueling machine 6, tank truck 1, LNG storage tank 2, supercharger 3, liquid nitrogen cold trap 5, and liquid nitrogen storage tank 4 .

[0043] The tank car 1 is provided with a tank car liquid discharge port 11 , a tank car pressurized liquid outlet 12 and a tank car pressurized air return port 13 .

[0044] The LNG storage tank 2 is provided with a storage tank inlet and outlet pipe 21 connected to the liquid discharge port of the tank truck and the liquid inlet of the LNG dispenser at the same time, and is used to convert the BOG of the LNG storage tank into LNG and input it into the LNG storage tank liquid. The liquid nitrogen condensation device 41 in the phase space.

[0045] The supercharger 3 is provided with a liquid inlet 31, an air return port 32, and a tank car or LNG storage tank pressurization selection valve 33; the liquid ...

Embodiment 2

[0060] The LNG pumpless filling method with BOG recovery function includes the following steps:

[0061] (A) Pumpless unloading and tanker BOG recovery: connect the tanker loaded with LNG to the LNG storage tank through the infusion hose or the unloading arm; open the liquid nitrogen condensation device in the LNG storage tank to condense the BOG in the LNG storage tank At this time, the pressure in the LNG storage tank is reduced; at the same time, the LNG in the tank car is pressurized so that the pressure of the LNG in the tank car is higher than that of the LNG storage tank, relying on the LNG tank car and the LNG storage tank. Pressure difference and complete the unloading of LNG through the infusion hose or the unloading arm;

[0062] (B) Pumpless refueling and recovery of vehicle-mounted steel cylinder BOG: Connect the vehicle-mounted LNG cylinder to the LNG dispenser and the vehicle-mounted BOG interface of the liquid nitrogen cold trap; open the liquid nitrogen cold t...

Embodiment 3

[0066] Example 3 Liquid nitrogen (LN 2 ) consumption calculation

[0067] The normal air supply pressure of LNG fuel vehicle engine is generally required to be between 0.8-1.2MPa (usually 0.8-1.0MPa, Max1.6MPa). In order for the LNG fueled vehicle to operate normally, the LNG saturation pressure that is required to be filled into the vehicle-mounted LNG cylinder should generally not be lower than 0.8MPa, although the booster of the LNG vehicle-mounted cylinder can be used for boosting when the saturation pressure is lower than this, so as to Make the pressure of the LNG steel cylinder reach the saturation state of no less than 0.8MPa, but it will take a certain time to pressurize and make the pressure of the entire LNG cylinder reach the saturation pressure of no less than 0.8MPa, which may affect the normal operation of the car. Therefore, as the LNG storage tank of the supporting LNG filling station, it is best to control the normal operating pressure at no less than 0.8MPa...

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Abstract

The invention discloses an LNG (liquefied natural gas) pump-free air-entrapping method with a BOG (boil off gas) recycling function and an LNG pump-free air-entrapping device. The LNG air-entrapping device with the pump-free air-entrapping and BOG recycling functions comprises an LNG air-entrapping machine (6), a tank car (1), an LNG storage tank (2), a pressurizer (3), a liquid nitrogen cold trap (5) and a liquid nitrogen storage tank (4). As the LNG air-entrapping device is a pump-free device, the operating and maintaining costs are low, and the safety is high. The LNG pump-free air-entrapping method is in a pump-free process during the unloading and liquid adding process, so that the power consumption is saved; and meanwhile, BOG is not diffused during unloading by the method, and the BOG in the tank car during unloading and the BOG in a vehicle-mounted steel cylinder in liquid adding process are automatically condensed and recycled, so that the energy loss is reduced.

Description

technical field [0001] The invention relates to the field of gas filling of liquefied natural gas, in particular to LNG gas filling equipment and method with functions of pumpless gas filling and BOG recovery. Background technique [0002] Natural gas (NG) is a non-renewable, clean and environmentally friendly energy mainly composed of methane, which is widely used in petrochemical, electric power, city gas and automobile industries. Liquefied natural gas (LNG) is a liquefied natural gas formed after natural gas is purified, condensed and liquefied. At 0.1013MPa (absolute), the liquefaction temperature of NG (related to the components) is about -162°C, and the gas-liquid volume ratio of NG and LNG is about 1:600 ​​(that is, 1m3 of LNG is vaporized into 600m3 of NG) , which has a large gas-liquid volume ratio. The working pressure of LNG storage tanks for LNG vehicle filling stations and vehicle-mounted LNG cylinders is generally not higher than 1.6MPa (usually ≤1.2MPa), wh...

Claims

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Application Information

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IPC IPC(8): F17D1/04
Inventor 廖兴才
Owner 成都深冷科技有限公司
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