The analysis of the unit feed-water control system
Abstract
If you want the unit run safely, the drum level too high or too low are not allowed .To ensure the boiler and the steam-engine run safely, you must keep the drum level in suit. In the start / stop process of the boiler, the feed-water control is very important. Drum level is a very important monitoring parameter in security, stability and economic operation of the boiler， keep the drum level normal is important conditions to maintain the drum turbine and boiler safe operation. With the parameters increase and expand capacity of the boiler, the feed-water control system must development.
The paper expatiate the development of the feed-water control system at home and abroad. Based on the basis of discussing the dynamic characteristic, thermodynamic measuring signals and the characteristic of regulating machine of the feed-water regulating system, control projects of unit whole-course feed-water control system is presented after analyzing the structure and the principles of the three impulses feed-water control system and the operation mode between the three impulses feed-water control and the single impulse feed-water control system.
The constitution principles and control function of the whole-course feed-water control system are introduced detailed and the whole structure, work principle, debugging and parameters modification of the system are analyzed. Take one power plant for example, analyzed the control process, control logic, operation mode and track of the feed-water control system.
Key words： The unit； Feed-water；Control system；Water level of drum
