Hi all, I was wondering if I could get a few suggestions on how to control the following scenario.
We currently have a heating system where we can heat a jacket to over 120°C and as a result can control the Pot to a similar temperature. However, we have recently got a new product in house that requires a temperature of 200°C in the Pot. To deal with this we are installing an electrical heater on the recirculation loop to the Jacket. This heater will have a digital output (to turn the Heater ON or OFF) and an analog output to control the power set to the heater.
To allow us get to the 200°C we will heat our jacket to 120°C then pressurise the Jacket and then switch on the electrical heater while manipulating the analog output to bring the vessel contents to circa 200°C. There will be no cooling media available to the jacket during the heating operation as we will need to maintain the pressure and will be solely relying on the electrical heater to get to our setpoint.
Our main concern is the control of the electrical heater with regards to delayed response and with residual heat transfer to avoid overshoot. We have never used an electrical heating element in-house before.
What we were wondering is whether we can control this electrical heater using normal PID or will there be an element of trial and error by manually manipulating the electrical heater at different stages during the heating process. Could we combine an element of the two?
I suppose my question narrow downs to the best way to accurately control an electrical element while also minimising overshoot due to residual heat. We have tuning facilities inhouse and can also set up trends to manually tune the loop but not sure it's as straight forward as that. Appreciate if somebody could point me in the right direction or suggest some reading material on heater element tuning\control. Thanks - Rpax
We currently have a heating system where we can heat a jacket to over 120°C and as a result can control the Pot to a similar temperature. However, we have recently got a new product in house that requires a temperature of 200°C in the Pot. To deal with this we are installing an electrical heater on the recirculation loop to the Jacket. This heater will have a digital output (to turn the Heater ON or OFF) and an analog output to control the power set to the heater.
To allow us get to the 200°C we will heat our jacket to 120°C then pressurise the Jacket and then switch on the electrical heater while manipulating the analog output to bring the vessel contents to circa 200°C. There will be no cooling media available to the jacket during the heating operation as we will need to maintain the pressure and will be solely relying on the electrical heater to get to our setpoint.
Our main concern is the control of the electrical heater with regards to delayed response and with residual heat transfer to avoid overshoot. We have never used an electrical heating element in-house before.
What we were wondering is whether we can control this electrical heater using normal PID or will there be an element of trial and error by manually manipulating the electrical heater at different stages during the heating process. Could we combine an element of the two?
I suppose my question narrow downs to the best way to accurately control an electrical element while also minimising overshoot due to residual heat. We have tuning facilities inhouse and can also set up trends to manually tune the loop but not sure it's as straight forward as that. Appreciate if somebody could point me in the right direction or suggest some reading material on heater element tuning\control. Thanks - Rpax