粗氩塔氮塞的原因及处理方法（Causes and treatment methods of nitrogen plug in crude argon column）.docVIP

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粗氩塔氮塞的原因及处理方法（Causes and treatment methods of nitrogen plug in crude argon column）.doc

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粗氩塔氮塞的原因及处理方法（Causes and treatment methods of nitrogen plug in crude argon column）

粗氩塔氮塞的原因及处理方法（Causes and treatment methods of nitrogen plug in crude argon column） Causes and treatment methods of nitrogen plug in crude argon column Under normal conditions, the oxygen content in argon fraction of the crude argon column value is 91.1%, if the oxygen content in argon fraction less than 90.5%, the crude argon column will appear slight nitrogen blockage, the oxygen content in argon fraction less than 90%, the crude argon column will appear serious nitrogen plug. The main causes of nitrogen clogging are as follows: (1) the oxygen output of products fluctuates greatly; (2) molecular sieve purification system switching; (3) variable working condition adjustment. 2.1 products oxygen fluctuations Mechanism of nitrogen blockage in crude argon column caused by 2.1.1 In the internal compression process, the oxygen removal rate is large, which leads to the lower temperature of the main heat exchanger and the air temperature of the cold straight air flow. As the central temperature is adjusted by the amount of high pressure air through PID regulation and automatic decrement, when the middle temperature is low, the high pressure air will increase, resulting in the reduction of oxygen content in the argon fraction. The main reasons are: (1) high pressure air volume increases, increased through the throttle valve FV1556 into the liquid column tower, reflux ratio increased, reduce the content of oxygen argon fraction; (2) high pressure air volume increases, the amount of liquid into the tower increases, under reflux ratio increases, the purity of liquid air also decreased will lead to the decrease of oxygen content in argon fraction; (3) under the tower level is adjusted automatically under the tower liquid amount, valve LVl601 will open a large amount of liquid into the tower on the tower on the increase, the reflux ratio increases, reduce the content of oxygen argon fraction. In this air separation unit, the 3.OMPa oxygen is delivered directly to the user via th