Functional diagram of desorption process automation

Regenerator C02 Regenerator C02 is equipped with 33 trays. Trays No. 1, 9, 23 - "blind," the remaining thirty trays - valve. Rich amine and rich amine expansion gases from heat exchanger E02C and expansion vessel B03 are introduced into regenerator column C-02 in two streams respectively. Control of the flow rate of these gases is carried out using single-circuit ACS. From flow sensor pos. 2-2, pos. 3-2, the signal is supplied to the control room to the programmable controller, in which the flow controller pos. 2-3, pos. 3-3. From regulator signal via switch pos. 2-4, pos. 3-4 and electro-pneumatic positioner pos.2-5, pos. 3-5 is supplied to actuator (control valve), pos. 2-6, 3-6. To control the level of regenerated amine in the bottom of the S-02 desorber, we use a combined control system. A disturbing effect for this system is the change in the flow rate of the semi-regenerated amine at the inlet to the column. From flow sensor (pos. 3-1) the signal is transmitted to the control room to the programmable controller, in which the dynamic flow compensator (pos. 3-3). The signal from the flow sensor is recorded by the computer. The main signal is level control. Signal from level sensor (pos. 4-1) is supplied to the control room to the programmable controller, in which the level controller is implemented programmatically (pos. 4-3). Signals from dynamic flow compensator and level regulator are transmitted to summing device (pos. 3-4), and then through the switch (pos. 4-4) and electro-pneumatic positioner (pos. 4-5), then to the actuator (pos. 4-7), installed in the line of recovery of the regenerated amine from the cube C-02, the control valve, which can be used to manually adjust the level. To control the temperature in the lower part of the regenerator, a cascade ACP is provided with correction for the flow rate of steam supplied to the reboilers to heat the regenerated DEA. Signal coming from temperature sensor pos. 5-1 is the main adjustable parameter supplied to the regulator pos. 5-3, and the signal from the flow sensor pos. 6-1 - additional. Signals 5-2 and 6-2 are transmitted to the internal regulator, then to the switch (pos. 6-4) and electro-pneumatic converter (pos. 6-5). Further to actuator (pos. 6-7) installed on the steam supply line to the reboilers. Acid gas stripping from the DEA solution is discharged from the top of the apparatus 72C02 and directed to the unit U151. Acid gas flow rate is controlled by flow sensor (pos. 1-1) with recording of readings on operator's AWS. Cutoff valve is installed on the line (pos. 1-7), which is also closed by command (pos. 1-6). For protection against elevated pressure, the regenerator 72C02 is equipped with spring safety valves of poses. 19-4/19-6/19-8 (2 PPKs are switched on - the third in reserve) installed in the helmet part of the vehicle. PSK setting pressure is 7.0 kgf/cm2. Overpressure is released through PSV to LF flare header. Reboiler system Reboilers E03A/B/C/D are designed to heat the DEA solution to 129 ° C. The semi-regenerated DEA solution enters the annulus of reboilers E03A/B and E03C/D from regenerator C02. Flow control is performed using single-circuit automatic control system. From flow sensors, pos. 8-2, pos. 14-2, the signal is supplied to the control room to the programmable controller, in which the flow controller pos. 8-3, pos. 14-3. From regulator signal via switch pos. 8-4, pos. 14-4 and electro-pneumatic positioner pos. 8-5, pos. 14-5 is supplied to actuator (control valve), pos. 8-6, 14-6. The steam-gas mixture formed by heating the DEA solution leaves the top of the reboilers and is sent under tray No. 2 of the C02 regenerator.The system of a reflux For temperature maintenance of top of a column of C02 (no more than 60 wasps) and prevention of ablation of liquid is provided a reflux system. Acidic water which consumption is regulated by one-planimetric ASR from the 23rd plate of C02 regenerator spontaneously comes to the reflux capacity of B04. Acid water is supplied to B04 tank with total quantity of 4 - 5 m3/h from U151 unit via line equipped with gate valve (pos.18-3) at the tank inlet and cutoff valve (pos.18-4) at the battery limit. Reboiler and reflux tank levels are supported by pos level sensors. 4-1, 11-1, 15-1, 16-1,17-1. signals from which are transmitted to the controller, and in case of lowering the level below the limit value, the signal is transmitted to the computer for signaling. Then the signal through switches pos. 4-4, 9-4, 16-4, 17-4 and electro-pneumatic positioners pos. 4-5, 11-5, 16-5, 17-5 is supplied to cutoff devices (pos. 4-6, 11-6, 16-6.17-6 installed on drain lines. Desorber column is protected from low pressure. When the sensor reaches 200 g/cm ², pos. 20-1 signal is output for automatic opening of shutoff device pos. 20-5 equalizing the column pressure with the LF flare system. The cutoff can be used to release pressure manually by a key on the display panel pos. 18-3. Column C-02 is equipped with PDT 19-1 differential pressure sensor with alarm in case of high differential pressure. In order to protect against increased pressure, the regenerator C02 is equipped with spring safety valves pos. 19-4/19-6/19-8 (2 PPKs are switched on - the third in reserve) installed in the helmet part of the vehicle. PSK setting pressure is 7.0 kgf/cm2. Overpressure is released through PSV to LF flare header .