What is the temperature control method for the double-cone rotary vacuum dryer?

The double-cone rotary vacuum dryer achieves precise temperature control primarily through a closed-loop feedback system integrated with a PLC or dedicated temperature controller. The specific control methods are as follows:

Temperature Monitoring and Signal Transmission: Temperature sensors (e.g., Pt100 platinum resistance thermometers) are installed at appropriate locations within the thermal fluid circulation piping or tank body. These sensors continuously monitor the outlet temperature of the heat transfer oil or the tank wall temperature, transmitting signals to the control system.

Closed-Loop Feedback Regulation: The control system compares the monitored temperature with the process target temperature set by the operator. When the detected temperature falls below the setpoint, it increases heater power output or adjusts the thermal fluid control valve opening. When the temperature approaches or exceeds the setpoint, it reduces heating input or activates the cooling bypass, forming a dynamic closed-loop regulation.

Multi-stage Programmed Temperature Control: For temperature-sensitive materials like biochemical products, the system supports multi-stage programmed temperature control. It automatically executes different temperature settings during distinct drying phases, preventing material overheating and denaturation caused by temperature fluctuations.

PID Regulation Technology: When the chamber temperature approaches the setpoint, the heating system enters PID regulation mode. During this phase, the instrument may briefly display measured temperatures slightly above or below the setpoint. This is a normal phenomenon as the PID algorithm employs proportional, integral, and derivative control to achieve precise and stable temperature regulation.

Temperature Control Range and Accuracy: The equipment's temperature control range typically spans 20-160°C, with accuracy reaching ±2°C, ensuring stable temperature throughout the drying process.