A method for automatic flushing of distillation tower pipelines

Abstract

The invention relates to an automatic washing method for a rectifying tower pipeline and belongs to the technical field of chemical oil refining production pipelines. According to the automatic washing method, on the basis of traditional liquid level-flow cascade control, dynamic function compensation is conducted on a tower bottom liquid level variable, that is to say, a main liquid level disturbance variable, the variable quantity of tower feed quantity, is adopted as a feed forward signal. The feed variable quantity is preset according to process requirements, the purpose is to stabilize the tower bottom liquid level, a dynamic function compensation method is adopted, effective dynamic control is conducted on the tower bottom liquid level, and thus the tower bottom liquid level can still operate stably under the circumstance of process adjusting of the feed quantity. Through the automatic washing method, stable control over the tower bottom liquid level of a rectifying tower can be achieved, and thus the influence of change of the feed quantity on normal production of the rectifying tower is reduced greatly; and meanwhile, the influence of model mismatch on the function of dynamic function compensation is lowered, a filtration module is added, and thus the system robustness is enhanced.

Description

technical field [0001] The invention relates to an automatic flushing method for a distillation tower pipeline, which belongs to the technical field of chemical oil refining production pipelines. Background technique [0002] In the chemical refining production, the rectification tower is the key rectification operation equipment, and its smooth operation is related to the purity of the target product. Among them, the liquid level at the bottom of the tower is directly related to the material balance and energy balance of the entire rectification tower. If the liquid level of the tower is too high, it may cause a full tank, and if the liquid level is too low, it may cause an empty tank. In order to maintain the normal production of the tower equipment, the liquid level at the bottom of the tower needs to be controlled within a certain safe operating range. [0003] The tower feed pipeline of some rectification towers is easy to block the subsequent process pipeline due to t...

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Problems solved by technology

[0005] The manual flushing method adopted in the prior art is likely to cause large fluctuations in the liquid level at the bottom of the tower, and the liquid level at the bottom of the tower is usually adjusted by the output at the bottom of the tower, and a liquid level-flow cascade control scheme is adopted. Such an adjustment method exists Time lag problem, the adjustment of the liquid level at the bottom of the tower is not timely enough, which is the main reason for the large fluctuation of the liquid level at the bottom of the tower. For some tower equipment with high control level, the large fluctuation of the liquid level at the bottom of the tower must be paid attention to

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