BOG condensation recycling system and method for LNG station

Abstract

The invention discloses a BOG condensation recycling system for an LNG station. A liquid inlet pipe of an immersed pump (3) is connected with a liquid drain pipe of an LNG storage tank (1) through a pipeline. A liquid drain pipe of the immersed pump (3) is connected with a gas filling machine through a pipeline and further connected with a heat source channel inlet of a BOG condensation recoverer (2) through a pipeline. A heat source channel outlet of the BOG condensation recoverer (2) is connected with a liquid drain pipe of a liquid nitrogen storage device (4) through a pipeline. A cold source channel outlet of the BOG condensation recoverer (2) is connected with a nitrogen blow-down pipe. The invention further discloses a method for recycling BOG. The BOG condensation recycling system and method have the beneficial effects that cost is reduced, zero discharge of BOG in the storage tank is achieved, energy is saved, and pollution to environment 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 LNG filling stations. 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 prot...

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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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