A system and control method for realizing LNG online saturation adjustment by using BOG

Abstract

The invention discloses a system and a control method for realizing on-line LNG saturation regulation by using BOG. The saturation pipelines are respectively connected to the LNG storage tanks, the filling pipelines are communicated with the heat exchanger, and the recovery and saturation adjustment pipelines merge with the filling pipelines after heat exchange by the heat exchangers; after the confluence, the LNG pipelines are connected with the LNG liquid filling machine; The inlet of the recovery and saturation adjustment pipeline is connected to the vapor phase space of the LNG storage tank, and the BOG gas in the LNG storage tank can be recovered through the recovery and saturation adjustment pipeline, and heat exchange is performed with the rear-end filling pipeline; the present invention can both The BOG gas generated by the storage tank is effectively used to achieve the purpose of reducing BOG emissions and BOG "0" emissions. It can also adjust and saturate the LNG filling process, which solves the problem of filling different vehicles with LNG at an appropriate temperature.

Description

technical field [0001] The invention relates to the technical field of LNG filling stations, in particular to a system and a control method for realizing online LNG saturation adjustment by using BOG. Background technique [0002] As a clean energy, LNG has been widely used in industrial and civil fields in recent years. In particular, the application in the transportation industry has developed the fastest. The scale of LNG-fueled vehicles is expanding in a blowout manner, and a large number of LNG filling stations have been built to provide filling services for vehicles. [0003] When adding LNG to LNG vehicles, it is necessary to ensure that the temperature of the added LNG is within the allowable range of the vehicle, so as to ensure the normal operation of the LNG vehicle. For LNG vehicles from different manufacturers at home and abroad, the corresponding LNG operating temperature ranges are different. If the LNG vehicle is filled with LNG with too high temperature, i...

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Problems solved by technology

[0006] The object of the present invention is to provide a system and control method for realizing LNG on-line saturation adjustment using BOG in view of the above shortcomings, which solves the problem of energy-rich BOG gas being lost in the process of pressure relief and discharge of storage tanks in the prior art, resulting in Waste of energy and pollute the environment. At the same time, it solves the problem that the LNG storage tank will produce additional BOG gas over time, and the temperature inside the storage tank will slowly rise, which will affect the storage period of LNG in the storage tank.

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