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一、概述在我们热电厂煤气车间,有两台七十年代的三筒式重油蓄热裂解炉。它的工艺过程的控制,采用两台SK型步进式顺序控制器。由于它是由半导体分立元件构成,故障率高,维护量大,可靠性低,经常出毛病。而且时间元件不准确,直接影响了制气的质量和生产的效率。甚至有时发生丢步、跳步等
First, an overview In our thermal power plant gas workshop, there are two seventies three-cylinder heavy oil thermal cracking furnace. Its process control, using two SK-type step-by-step sequence controller. Because it is composed of discrete components of the semiconductor, high failure rate, large maintenance, low reliability, often a problem. Moreover, the time components are inaccurate, which directly affects the quality of gas production and the efficiency of production. Sometimes even lost step, jump and so on