Evaporating gas treatment device for liquefied natural gas device
A technology for liquefied natural gas and boil-off gas, which can be used in liquid processing, gas processing/storage purposes, gas processing/storage effects, etc., and can solve problems such as threats to life and property safety, hidden dangers to equipment safety, and high energy consumption.
Pending Publication Date: 2020-08-21
DALIAN OCEAN UNIV
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Problems solved by technology
However, if BOG is not disposed of in time, there will be potential safety hazards in overpressure operation of the equipment. Therefore, reasonable recovery of BOG is an important guarantee for the safe operation of the system.
[0008] To sum up, the current main method of recovering BOG is to use it outside after mechanical boosting. The process equipment consumes a lot of energy and costs high
Moreover, the BOG processing process has extremely high safety risks, and it is very easy to cause safety production accidents in flammable and explosive environments, posing a threat to the safety of people's lives and property.
Method used
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[0025] Embodiments of this specification will be described below with reference to the accompanying drawings.
[0026] figure 1 A schematic structural diagram of a system for recovering evaporated gas through a natural gas injector according to an embodiment of the present specification is shown. Liquefied natural gas is stored in LNG tanks on land or in LNG ships or pipelines during transportation. The BOG and LNG are separated by the separation equipment, and then the BOG and LNG are processed separately through different pipelines. The BOG processing pipeline includes access to at least one stage or one injection nozzle, and uses the high-pressure gas after LNG gasification to pressurize the BOG. The pressure of the BOG pressurized by the injection nozzle is detected, and if necessary, the BOG is pressurized again through an additional pressurization device. The pressurized BOG is connected to the CNG pipeline network and provided to end users. On the side of the LNG pi...
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The invention discloses an evaporating gas treatment device for a liquefied natural gas device and relates to the field of natural gas storing and transportation. The evaporating gas treatment devicecomprises a liquefied natural gas storing device, an external transportation system, an evaporating gas BOG injection pressurizing system, an automatic switching device and a pressurizing system; theevaporating gas BOG injection pressurizing system comprises at least one-stage ejector; the ejector comprises a nozzle, a suction chamber, a mixing chamber and a diffusion chamber; the nozzle is connected into the liquefied natural gas storing device; evaporating gas BOG is connected into the suction chamber; liquefied natural gas is mixed with evaporating gas BOG; and the automatic switching device carries out diffluence on the mixed fluid ejected via a first-stage ejector, one part of the mixed fluid is fed in a natural gas pipeline network to be provided for a terminal user, and the other part of the mixed fluid is provided for the downstream evaporating gas BOG injection pressurizing system, and returns to a liquefied natural gas storing tank via the pressurizing system. The evaporating gas treatment device can be suitable for various application occasions, and is easy to switch and low in energy consumption.
Description
technical field [0001] The invention relates to the field of natural gas storage and transportation, in particular to an efficient energy-saving recovery method for evaporated gas during natural gas storage and transportation. Background technique [0002] In recent years, with the increasingly serious air pollution, the global control of gas emissions from ships has become increasingly strict. Developed countries such as Europe and the United States have established their own emission control areas to meet Tier II and Tier III emission standards within the specified time. [0003] Natural gas is a high-quality, high-efficiency, green and clean low-carbon energy source. It contains almost no sulfur, dust and other harmful substances. Its combustion causes a low greenhouse effect. It is expected to become the world's largest energy source by 2030. Natural gas is usually stored and transported in a cryogenic liquid state around -160°C. LNG (Liquefied Natural Gas) is the abbr...
Claims
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IPC IPC(8): F17C9/02F17C6/00F17C13/00F17D1/00F17D3/01
CPCF17C6/00F17C9/02F17C13/00F17C2221/033F17C2223/0161F17C2225/0161F17C2227/0128F17C2227/0192F17C2227/0302F17C2227/0337F17C2227/039F17C2227/0393F17C2260/046F17C2265/034F17C2265/036F17C2265/037F17D1/005F17D3/01
Inventor 张琨田兴旺李丛孙丹林静
Owner DALIAN OCEAN UNIV