A dynamic self-calibration control method for reheating flue gas temperature of waste heat boiler

Abstract

The invention discloses a dynamic self-correction control method of reheating smoke temperature of a waste heat boiler. The method comprises the following steps of according to a dynamic self-correction control model of a controlled object obtained by a step response test of reheating smoke temperature settings, enabling an automatic control system of the reheating smoke temperature of the waste heat boiler to record a gas valve opening instruction sequence and a reheating smoke temperature measuring value sequence in a real-time way; and dynamically setting each parameter by a controller, so as to obtain the current gas valve opening increment instruction. The method has the advantages that the dynamic performance of the reheating smoke temperature control system of the waste heat boiler is improved, and the problems of large hysteresis and slow response speed of the reheating smoke temperature control system are effectively solved; the offset range between the reheating smoke temperature and the specified value is ensured, and the stability of the reheating smoke temperature control system is improved; and meanwhile, the stop of the waste heat boiler is avoided under the accident working conditions of great change of a waste heat source, no waste heat source, and the like.

Description

technical field [0001] The invention relates to the field of thermal automatic control, in particular to a dynamic self-correcting control method for reheating smoke temperature of waste heat boilers. Background technique [0002] The waste heat boiler reheating flue temperature system refers to the control system of the waste heat supplementary combustion device. It is one of the most important control systems in cement plants and steel plants, and it is also one of the difficult points of control. The controlled quantity is the temperature of the reheated flue gas. Generally, the temperature of the reheated flue gas is low, but the temperature is too low to make the waste heat boiler operate normally under the designed rated load, especially when the waste heat is used to generate electricity, causing the generator set to It often fails to operate at full load, deviates from the best design conditions, and even is forced to shut down, which reduces the operating efficiency...

AI Technical Summary

Problems solved by technology

However, under the increasingly high performance requirements and the high degree of uncertainty in the process and environment, there are still some problems when the system is used for real-time control, such as the controller structure is too complex, the amount of calculation is large, etc.

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