Humidity optimization control method for waste heat drying system

Abstract

The invention discloses a humidity optimization control method for a waste heat drying system. At first, a model prediction control method is adopted to control the humidity value of gas of an outlet of the waste heat drying system, the humidity value of the gas is made to be stably transited to a set value according to a set reference track, and the situation that due to the fact that the control input amount is overlarge, dry goods spontaneously combust and potential safety hazards of the system are caused is avoided; in consideration of the influence of disturbance of the input control amount of the system, feed-forward compensation is added to form a feed-forward and feedback composite control, a prediction model is rectified, system disturbance input response is quickened, and the prediction error of the system is reduced at the same time; after the humidity value reaches the set value, an LG optimization control method is adopted to perform optimization control over the system, the capacity of resisting disturbance by the system is increased, and the gas consumption of the system is made to be least. The humidity optimization control method reduces the influence on the system by the input disturbance, improves the control precision, enables the energy consumption of the system to be least, and meets the requirements of industrial production for energy conservation.

Description

technical field [0001] The invention belongs to the field of information technology, and relates to a model predictive control method (MAC, model algorithm control), a feedforward-feedback control method and an LQ optimal control method in automation technology. for optimal control. Background technique [0002] Waste plastic refining is a new process of cracking and refining waste plastics generated in domestic and industrial production processes. In order to ensure the efficiency and safety of the pyrolysis process, waste plastics must be dried before pyrolysis. Since waste plastics are combustible and waste paper and other flammable objects are mixed with them, in order to improve drying efficiency and avoid spontaneous combustion of dried items, hot air and waste plastics are mixed and dried during drying. The efficiency of this mixed drying and the utilization rate of gas depend on the humidity value of the outlet flue gas after drying. In this drying system, when the...

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Problems solved by technology

However, the control algorithm in the control of similar drying systems in the past did not take into account the influence of flue gas humidity, so the drying effect of the system is often not good, the cracking efficiency of waste plastics is not high, and gas waste is caused, which does not meet the requirements of energy saving and consumption reduction. Require

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