Crude oil cargo hold ventilation system and offshore floating production oil storage ship comprising same

Abstract

The invention discloses a crude oil cargo hold ventilation system and an offshore floating production oil storage ship comprising the crude oil cargo hold ventilation system. The crude oil cargo holdventilation system comprises an inert gas generator and a hydrocarbon gas supply device, wherein the inert gas generator is communicated with a cargo hold through a pipeline. The crude oil cargo holdventilation system further comprises the hydrocarbon gas supply device which is communicated with the cargo hold through a pipeline. The inert gas generator and the hydrocarbon gas supply device are communicated with the cargo hold, so that the cargo hold not only can replace air in the cargo hold through inert gas generated in the inert gas generator, that is, oxygen in the cargo hold is reduced,but also can input hydrocarbon gas into the cargo hold to replace inert gas with hydrocarbon gas, so that the oxygen content in the cargo hold is always lower than a critical value causing explosion,and the purpose of protecting the cargo hold is achieved. By adopting the structure, the use amount of inert gas can be reduced, on the one hand, the cost can be saved, and on the other hand, waste gas discharged in the inert gas generation process can be reduced.

Description

technical field [0001] The invention relates to the field of ships, in particular to a ventilation system for crude oil cargo tanks and an offshore floating production and storage ship containing the system. Background technique [0002] Units loaded with more than 8,000 tons of crude oil, such as FPSO (offshore floating production storage ship), FSO (offshore floating oil storage-offloading ship), FSU (floating oil storage platform), etc., need to be equipped with an inert gas system , to reduce the oxygen content in the cargo hold, so that the oxygen content of the gas in the hold cannot reach the level of explosion. At the same time, it is used to prevent the oil vapor in the cabin from evaporating into the atmosphere. [0003] In the above types of ships, boilers are generally not equipped, and flue gas-type inert gas systems cannot be used. Only inert gas generator systems can be used to prepare inert gas, and then the inert gas is transported to the cargo hold for sto...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a crude oil cargo tank ventilation system and FPSO including its

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