Fuzzy self-tuning PID on The Liquid State Ammonia Nitrate Storage Tank temperature control system

In the current Liquid State Ammonia Nitrate Storage Tank System, the traditional PID temperature control is used mostly. By controlling the flow of heating steam valve, the outlet temperature of the liquid state ammonia nitrate storage tank can be controlled. However, during the production process, much interference exists with the characters of nonlinear, time-varying and large lag which the controlled objects have. Therefore, the single PID parameter cannot control the temperature accuracy. During the operation of the entire production line, a relatively stable temperature of the production process should be maintained, while the excessive consumption of energy in the production process should be reduced. For this situation, the fuzzy PID control is a better choice for temperature control. According to the difference of temperature departure and its rate of change, the fuzzy parameters self-tuning PID algorithm can control the system by choosing different P, I, and D parameters in order to achieve the online self-tuning function for better using in the operation of the product line.