A Method for Indirect Monitoring and Regulation of Trace Water in Polyolefin Reactor

Abstract

The invention discloses a method for indirect monitoring and regulation of trace water in a polyolefin reactor. The method includes: a detection step, using a pressure detection device to detect the pressure change of the stream in the cold box, and transmitting the information to a computing device; a calculation and analysis step, using the computing device to analyze the pressure information from the detection step, and calculating the pressure of the stream entering the cold box Content, indirectly calculates the water content in the polyolefin reactor, warns of abnormal conditions, and sends adjustment instructions to the control step at the same time; control step, receives instruction information from the calculation and analysis step, controls the valve v1 to adjust the flow rate of the deactivation steam, and controls the valve v2 adjusts the flow rate of the stream entering the dehydration tower, thereby reducing the water content of the reactor and increasing the production rate. The method of the present invention can not only quickly detect the water content of the reactor through the coordination and cooperation of the detection step, calculation and analysis step and control step, but also can adjust the flow rate of the water removal operation and the flow rate of the deactivation steam in real time to improve the overall production efficiency.

Description

technical field [0001] The invention belongs to the field of polyolefin production, and in particular relates to a method for indirect monitoring and regulation of trace water in a polyolefin reactor. Background technique [0002] During the production of olefin polymers, unreacted hydrocarbons (ethylene, ethane, propylene, butene, butane, isopentane, hexene, etc.), nitrogen, residual catalyst, etc. These unreacted hydrocarbons must be removed and the residual catalyst in the polyolefin resin must be deactivated to meet environmental protection standards and ensure the safety of downstream processes and products. At present, the gas-phase polymerization process is widely used in factories due to its simple process flow, flexible and convenient operation, wide range of products, and low investment cost. CN104792117B etc.) disclosed in. [0003] In order to deactivate the residual catalyst in the resin, it is usually necessary to add deactivation steam into the degassing ch...

AI Technical Summary

Problems solved by technology

Some factories use the static signal fluctuation detection method to monitor the water content in the reactor, but only when the water content in the reactor is greater than 10ppm, can they receive a relatively obvious static fluctuation signal, and then the operator can manually adjust it. During the whole monitoring process, the monitoring system has low sensitivity, long response cycle and operation lag

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