Research On The Offshore Adaptability Of Gravity Type Gas-liquid Separator

With the environment and climate issues increasingly strained,clean energy in the human energy consumption is accounted for bigger and bigger.The natural gas is one of the most widely used clean energy.The expansion of the market,makes the exploitation of natural gas goes deeper.FLNG,the new device which collects production,storage,loading and unloading and transportation,has become more and more popular between different countries and companies.New device also poses a new challenge,due to sea,the offshore production platform will sway in six Angles,which will inevitably influence the appearance of some facilities on the platform,and gravity gas-liquid type separator is one of the facilities.A separator,as necessarily function,gas and liquid must be in the inner space at the same time,and the fill ratio of separator is always in the range of occurs sloshing easily.And The sloshing of floating production platform will cause fluctuation of gas liquid interface in gravity type separator,interfere even interrupt the separation process,reduce separation efficiency and increase separation time.So this paper study on the dynamics theory of liquid sloshing in containers firstly,summarizes the law of natural frequency,wave surface and pressure in sloshing.And based on the research,this paper studied different simulation theories,set up and verified reliable simulation model,combined with other scholars' successful experiments.This paper compared the separation appearance,wave fluctuation and pressure on the wall between vertical and horizontal separator with roll conditions by internal flow field simulation,and analyzed the Offshore Adaptability of two type separators.The result shows that vertical separator could not completely separate gas and liquid with roll condition,which is obviously worse than the horizontal type.Both the range and frequency of the fluctuation of gas liquid interface in the vertical type are larger than the horizontal type,and so is the force on the wall.It is better to choose horizontal gravity separator in the floating liquefaction natural gas process.This paper studied the resistance to slosh after adding baffles in the horizontal separator.First we confirmed the principle that the open-ratio area should not be very high,0.35 will be fine.Second we optimized the structure of baffle,only set baffles in the middle height of horizontal separator,where is the violent area of sloshing,increasing the efficiency of resistance to sloshing,decreasing the difficulty of producing and production and operation.We also compared the resistance to sloshing of separators with different baffles number and confirmed an economical number.Different position for the same baffles number was also be compared,formed the conclusion of the best position.This paper also compared the separation performance and wave height between separators with and without baffles,forming the conclusion that the cycle would change to one fifth after adding baffles.