BOG (boil-off gas) condensation recovery system for vehicle-filling system and method

Abstract

The invention discloses a BOG (boil-off gas) condensation recovery system for a vehicle-filling system. The system comprises an LNG (liquefied natural gas) storage tank (1), a BOG condensation recoverer (2), a liquid nitrogen storage tank (3) and multiple tank cars (4); the top of each tank car (4) is provided with a BOG lead-out branch pipe connected with a heat-source channel inlet of the BOG condensation recoverer (2) via a BOG lead-out pipe (5); the heat-source channel outlet of the BOG condensation recoverer (2) is connected with the LNG storage tank (1) via a pipeline; a cold-source channel inlet of the BOG condensation recoverer (2) is connected with a liquid discharging pipe of the liquid nitrogen storage tank (3) via a pipeline, and the cold-source channel inlet of the BOG condensation recoverer (2) is connected with a nitrogen escape pipe; and the nitrogen escape pipe is connected with the liquid nitrogen storage tank (3). The invention also discloses a method for recovering BOG. The beneficial effects comprise that cost is reduced because of once investment, zero discharge of BOG is realized, energy is saved and environment pollution is avoided.

Description

technical field [0001] The invention relates to the technical field of BOG gas recovery, in particular to a BOG condensation recovery system and method for a vehicle charging system. Background technique [0002] LNG (liquefied natural gas) is a clean energy. With the gradual and widespread application of LNG fueled vehicles (ships), urban residential gas, boiler gas and gas power generation, ceramic sintering and other fields, the demand for LNG consumption is showing a rapid growth trend in recent years. There are two main sources of LNG, namely the so-called "land gas" (LNG produced by onshore LNG liquefaction plants, usually transported by LNG transport vehicles), "sea gas" (overseas LNG, usually transported by large LNG LNG is transported by ship to land LNG receiving terminal and stored). The liquefaction temperature of LNG under normal pressure is about -162°C. Although the LNG storage and transportation equipment or LNG transportation pipelines have taken good cold...

AI Technical Summary

Problems solved by technology

With the increasing heat absorption of LNG, the production of BOG will gradually increase, and the pressure of LNG storage and transportation will also continue to rise. In this case, if no effective pressure reduction measures are taken, in order to avoid accidents such as overpressure and safety, When the pressure of LNG storage and transportation reaches a certain pressure, it will generally release the pressure to the atmosphere automatically or manually. The release of BOG will cause environmental pollution, energy waste and economic loss

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