阐述了用PLC及其扩展单元实现合成氨厂造气炉制气过程的自动控制和入炉蒸汽的自动调节方法，并对该控制方式的节能效果进行了分析。
The method to control gas making furnace with PLC and its extend units as well as to regulate the steam is expounded in this paper.
最后指出，在制气过程中应当分阶段调节蒸汽流量，以达到较好的气化效果。
It is finally pointed out that during gasification the steam flowrates should be adjusted in steps so as to give a better gasification result.
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