How process control system help manages the plant operation?
How process control system help manages the plant operation?
(Start from process raw material fed into the process to its final state of production.)
Process control system must be installed to make sure that distillation column to operate well for achieving required production rates and product quality. Current application for distillation control is based on linear controller such as Proportional (P) and Proportional-Integral-Derivative type controller. Each column has a control system made up of several control loops. This control loop has to be adjusted to compensate for changes due to disturbances in plant operation. The control loops consists of sensor and transmitter, controller and control valve. The sensor measures the plant variable from the plant and the information send by transmitter to DCS controller. The controller checks if the process variable agrees with the set point.
The computer attached to the distillation unit allows for the flexibility of changing the controller set up, thus enabling different control scheme to be tested and their performance explored. ‘Loose’ control costs money and can compromise products product yield, quality and throughput. Profitability of the process can be improved by reducing variability in the control loop. Process variable like temperature, pressure, flow rates, levels and compositions must be controlled. This is because the changes in process variables will affect one another. The variables that need to be controlled are distillation column pressure, reflux drum liquid level, column bottom liquid level, separation power base, material balance split. Pressure has prime distillation control variable. This is because when the pressure is reduced, a surge takes place in vaporization. When the pressure increases, it can cause a surge in condensation. Therefore, the pressure has to run steadily during the process. Therefore, the best way to control column pressure is to manipulate a valve in a vent
(Start from process raw material fed into the process to its final state of production.)
Process control system must be installed to make sure that distillation column to operate well for achieving required production rates and product quality. Current application for distillation control is based on linear controller such as Proportional (P) and Proportional-Integral-Derivative type controller. Each column has a control system made up of several control loops. This control loop has to be adjusted to compensate for changes due to disturbances in plant operation. The control loops consists of sensor and transmitter, controller and control valve. The sensor measures the plant variable from the plant and the information send by transmitter to DCS controller. The controller checks if the process variable agrees with the set point.
The computer attached to the distillation unit allows for the flexibility of changing the controller set up, thus enabling different control scheme to be tested and their performance explored. ‘Loose’ control costs money and can compromise products product yield, quality and throughput. Profitability of the process can be improved by reducing variability in the control loop. Process variable like temperature, pressure, flow rates, levels and compositions must be controlled. This is because the changes in process variables will affect one another. The variables that need to be controlled are distillation column pressure, reflux drum liquid level, column bottom liquid level, separation power base, material balance split. Pressure has prime distillation control variable. This is because when the pressure is reduced, a surge takes place in vaporization. When the pressure increases, it can cause a surge in condensation. Therefore, the pressure has to run steadily during the process. Therefore, the best way to control column pressure is to manipulate a valve in a vent