Abstract: The feature of material is one of main causes to affact forming quality and energy consumption in the process of briquetting. Research shows that the plastic, strength and wear resistance of material is variable dependent on different temperature. The appropriate temperature can improve the plasticity of material and reduce the abrasion resistance, improve the product quality and reduce energy consumption. The changeful environment condition makes artificially control temperature under ideal condition difficult. The design applies Pt100 temperature sensor to detect the outlet temperature of the modulator. A PLC of integrating PID controller is used to calculate refining temperature and output the control signals to control the DN15-200 proportional valve. Thus the automatic control of temperature is achieved. The corn stalks (10 kg) with moisture content of 18% were used as experimental materials. The simulation experiments were carried out on a control system without temperature equipment and system equipment with temperature control when the product density was set at 1.2 g/cm³. The energy consumption was decreased to 68.7% and the production rate was increased to 36.8% of the system. This could offer helps to promote automation of the straw briquette system and industrialization of products.

Key words: straw briquette, PLC, temperature control, loop die