针对300 MW火力发电机组原锅炉吹灰控制系统存在的联锁回路复杂、故障频繁等问题，阐述了对该系统进行改进的必要性。
Aiming at the problems of interlock circuit complex and faults frequent of the origin boiler soot blowing control system for 300mw generation unit, elaborates the necessity of improvement.
详细说明了双加压稀硝酸工艺装置中复杂控制回路和联锁，以及DCS控制方案的实际应用效果。
The complex control loop of dual-pressure process and interlock of units are explained in detail, DCS automatic control is accurate and effective in practice.
门联锁：起动与馈电回路的门机械联锁以避免在装置通电的情况下开门。
Door Interlocking: starter and feeder doors mechanically interlocked so doors cannot be opened with unit energized;
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