Title: Boiler Drum automatic adjustment system design
ABSTRACT
In the boiler operation, the water level is a very important parameter. If the water level is too high, it will affect the separation of the effect of soft drinks, the use of gas equipment failure; while the water level is too low, it will undermine the soft cycle, in severe cases lead to boiler explosion. At the same time high-performance boiler steam flow generated by large, while the drum volume is relatively small, so the boiler water level control is very important. Boiler water level automatic control task is to control water flow to maintain a balance with the evaporation to maintain the water level inside the drum to the extent permitted change is to ensure safe operation of steam turbines and boilers important condition.
In this paper, to understand the boiler drum water level control, status and control strategy, its classic drum water level control strategy, including a single impulse, impulse, and three pairs of impulse control. As a single impulse, double-impulse and single-stage three impulse control strategy is relatively simple, and difficult to adapt to the modern complex control requirements of the boiler, the boiler drum water level control of current majority of three-level impulse control strategy, this article only three impulse cascade control strategy for detailed analysis. And specific analysis of the dynamic and static features based on the volume control from a single impulse to the pairs of impulse control impulse control and finally to three designs selected in the selection of the best "three-impulse" control, and the PID parameter tuning also carried out the necessary analysis of , analysis of the various control design advantages and disadvantages exist to illustrate the realization of applications that need attention, in this based on the latest technology for water level control is also discussed.
KEY WORDS: Boiler drum; Dynamic; Water level control; Three impulse control systems；PID
