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一、串级调节系统的基本概念 (一)什么叫串级调节系统? 为了认识串级调节系统,我们先举一个氧化炉的例子。在硝酸生产中,氧化炉是关键设备,氨气与空气在氧化炉内进行氧化反应,把氨氧化成一氧化氮。为了保证氧化率达到97％以上,工业生产要求将氧化炉反应温度严格控制在840±5℃范围之内。为此,该厂采用了图1所示的简单调节系统。这个系统的特点是:所有对反应温度的干扰因素,统统地包含在调节
First, the basic concepts of cascade control system (A) What is the cascade control system? In order to understand cascade control system, let’s give an example of an oxidation furnace. In nitric acid production, oxidation furnace is the key equipment, ammonia and air oxidation reaction in the oxidation furnace, the ammonia oxidation into nitric oxide. In order to ensure the oxidation rate of more than 97%, industrial production requirements of the oxidation furnace temperature is strictly controlled at 840 ± 5 ℃ range. To this end, the plant uses the simple adjustment system shown in Figure 1. The characteristics of this system are: All the interference factors on the reaction temperature, all included in the regulation