Control scheme for controlling the internal temperature of the reactor
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The input amount is constant, and a regulating valve controls the temperature inside the reactor to remain unchanged. If PID adjustment is simply used to control the reaction temperature, the temperature lag is very serious, and the regulating valve fluctuates too much in practice. Does anyone have a good control plan? Our company has never had a good control method. Operators adjust and control the temperature manually.
Single-loop control cannot achieve the effect (to achieve the effect, PID parameter tuning requires experience value. Cascade adjustment can solve the lag problem (but parameter tuning requires experience). This post was last edited by fangyjun on 2008-2-29 16:25 ]
How to get another control point. Is it the external temperature of the reactor or the flow rate of steam. This point has always been difficult to figure out. Or should the pressure of the reactor be adjusted in cascade? ? ?
The inner ring takes the jacket temperature as the control point.
It is difficult to control the temperature of the reaction kettle using steam to heat it. Our company also encountered this problem. The current heating method is hot water circulation. First, steam is used to heat a large water tank, and the temperature of the water tank is automatically controlled. If the pressure inside the water tank is atmospheric pressure and the temperature exceeds 100°C, the water will vaporize. To prevent this from happening, a self-operated valve is installed on the water tank, which can increase the pressure in the water tank and the water temperature can exceed 100°C. The hot water in the jacket of the reactor is circulated by a large-flow pump, so that the temperature in the reactor can rise smoothly. If you want to maintain the temperature in the reactor, just control the water temperature. This way the control will be simpler. Of course, if the temperature inside the reactor needs to be lowered, a cold water pipe can be added to the entrance of the reactor jacket.
Keeping the upper floors intact is one way, but now is an era of energy shortages. When you add these things, it takes a lot of energy. Including pumps, steam heating water, etc. When adding these things, you must consider the process.
You can draw the reaction temperature curve of the reactor, use the timer in the program, and change the PID setting value in stages. In order to achieve the purpose of pre-tracking!