Selection and commissioning of temperature control system for lime kiln
The calcination quality and energy consumption level of a lime kiln directly depend on the precision and stability of the temperature control system. Scientific selection and precise debugging are the key to ensuring system efficiency.
1、 System selection: Matching process requirements
The core of selection lies in meeting specific production processes. Firstly, the number and location of temperature measurement points need to be determined based on the kiln type (such as parallel flow thermal storage kiln, double chamber kiln, etc.) and production capacity. The key parameters include control accuracy, response speed, and system stability.
The current mainstream choices are distributed control systems (DCS) or high-performance programmable logic controllers (PLC), which can integrate multiple thermocouple or infrared thermometer signals to achieve comprehensive monitoring of the temperature inside the kiln. In terms of execution mechanism, intelligent electric control valves or frequency converters with high adjustment accuracy and good linearity should be selected to accurately control fuel and air volume. The anti-interference ability of the system and its long-term reliability in harsh environments are factors that must be considered.
2、 System debugging: achieving precise control
Debugging is the process of integrating theoretical parameters with actual working conditions. Firstly, complete the individual calibration of all instruments and actuators to ensure accurate signal transmission. Subsequently, system integration debugging is carried out to establish a complete control loop from measurement, PID operation to execution.
The core of debugging is the tuning of PID parameters. It is necessary to carefully adjust the proportional, integral, and derivative parameters based on the heating characteristics and large inertia of the kiln, in order to eliminate static errors, accelerate response, and avoid temperature oscillations caused by overshoot. Debugging work often requires repeated optimization under different production loads until the system can maintain temperature stability under various operating conditions, ultimately achieving high-quality, low consumption automatic operation.
