Overpressure protection measures for flare gas recovery system based on dynamic simulation
Flare gas recovery system(FGRS)is an important method to reduce the carbon emission reduction for oil and gas fields,while it lacks the systematic researches,especially in overpressure protection point.Taking the WC9-7 DPP offshore platform as an example,a dynamic model was established by using the K-Spice software to determine overpressure protection measures under different relief cases.The results show that the setting value of pressure alarm high-high(PAHH)of the flare knockout tank should be determined according to the variation of recovered continuous flare gas flowrate.The PAHH value of 210 kPa in specification is too high,and it should be adjusted to 38.5 kPa,in order to guarantee the overpressure is not higher than the tank design pressure and also can meet the requirement the relief backpressure of low-pressure facilities on the platform.To ensure the independence of primary and secondary protection measures under emergency relief condition,the opening duration of emergency shutdown valve(ESD)on flare vent path should be less than 27 seconds.To ensure the tank pressure during the emergency relieving process does not exceed its design pressure and consider the impact of relieving by the pressure safety element(PSE)on the backpressure of upstream facilities,the Z-type PSE was finally selected.At present,a completed scheme for FGRS was made based on the key parameters stated above.A carbon emission reduction effect over 13 000 cubic meters of flare gas per year can be anticipated.This study provides a quantitative analysis method to determine the key parameters of overpressure protection measures of FGRS and a reference for the design of FGRS.
carbon emission reductionflare gas recovery systemoverpressure protection measuresdynamic simulationsetting value of pressure alarm high-highemergency shutdown valveopening duration of the valvetype of pressure safety element
万方数据
维普
