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小氮肥经过４０余年的不断发展，合成氨生产规模已普遍达到４～１２万ｔ／ａ，有些厂家已达到１５万ｔ／ａ以上。但就自控角度来说，合成氨部分一直没有通用的定型设计。随着生产规模的不断扩大，仪表自控随之不断地补充更新。生产企业各有特色，仪表配备和自控状况不一。...
After more than 40 years of development of small nitrogen fertilizer, the scale of ammonia production has generally reached 40,000 to 120,000 t / a, and some manufacturers have reached more than 150,000 t / a. However, the automatic control point of view, there is no universal ammonia stereotypes design. With the continuous expansion of production scale, automatic control instrument will be constantly updated. Production enterprises have their own characteristics, instrumentation and automatic control of varying conditions. ...