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CO2 Separation in a Rectisol Plant

In the expansion vessel DA of a Rectisol plant (installation for physical gas cleaning), whose flow sheet is shown in Fig. 9.49, CO2 is separated from methanol saturated with CO2 by lowering the pressure. The separated CO2 is fed into the vessel FA. The methanol, which is again saturated because pressure is lower (this implies, of course, a CO2 content lower than initially) is discharged in a controlled way from DA. The control maintains a fllUng level of about 40 % in the vessel [Pg.410]

Its failure would lead to an introduction of methanol in vessel FA. This is not desirable for operating and safety reasons. [Pg.411]

The level control is realized by control valve RV, which is activated by level controllers LICAl and LICA2, which are redundant (loo2). They also activate an alarm in the control room if the level is high. According to the operating instructions the operator then has to open the motor valve M by pushing a button. The control valve RV closes if instrument air fads. [Pg.411]

The fault tree for the undesired event filling level too high is shown in Fig. 9.50. High levels can be initiated by the faUure of the activation of control valve RV by LICAl and LICA2, the failure of the control valve RV itself or the failure of instrument air. Further potential causes are that LICAl and L1CA2 remain in their positions for functional tests after inspection or a CCF of both level measurements. The latter is treated using the Beta Factor Method with 6 = 0.1. [Pg.411]

The safety system consists of the alarm because of a high filling level and the corresponding instruction to open the motor valve M in the bypass of the methanol outlet by pushing a button. However, the alarm is only useful in case of control valve failure. [Pg.411]


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