On-line monitoring and alarm method of low boiling tower tail gas condensation in polyvinyl chloride synthesis process

Abstract

The invention provides a polyvinyl chloride synthesis process low-boiling column exhaust condensation on-line monitoring and alarm method. The method is characterized in that the changing trend of the temperature is estimated by employing the temperature of an outlet of an exhaust condenser, and the decrease of the condensation efficiency is detected as soon as possible by employing derivative information. If the efficiency of the exhaust condenser is reduced and the phenomenon of freezing occurs, the temperature of the exhaust outlet will be obviously reduced.

Description

technical field [0001] The invention belongs to the field of automatic control of the production process of chlor-alkali chemical industry, in particular to a method for on-line monitoring and alarming of tail gas condensation of low-boiling towers in the synthesis process of polyvinyl chloride. Background technique [0002] Polyvinyl chloride (PVC) is an important organic synthetic material in the chlor-alkali industry, widely used in industry, agriculture and daily life. The synthesis process of vinyl chloride is one of the key links in the chlor-alkali industry, providing basic raw materials for the production of PVC. Vinyl chloride synthesis process is mainly divided into acetylene method and ethylene method. Due to my country's special energy structure, the acetylene method has become the main process for the production of vinyl chloride monomer. As of the end of 2008, my country's production capacity of polyvinyl chloride based on the acetylene method has accounted f...

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Problems solved by technology

However, this approach is not satisfactory in terms of timeliness, and considering the drift of actual temperature measurements, it is also difficult to reasonably determine the threshold

Therefore, in practical applications, it is difficult to detect the reduction in the efficiency of the exhaust gas condenser in time: when the alarm is finally generated, the exhaust gas condenser may have a very serious icing phenomenon

[0005] In view of the above problems, the purpose of the present invention is to establish a real-time and effective online monitoring and alarm method for tail gas condensation efficiency based on daily real-time operating data, and for actual process variable measurement noise and offset, so that the tail gas condensation efficiency can be found early to avoid excessive icing of the exhaust gas condenser

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