DCS charging control method of producing PVC paste resin by polymerizer

Abstract

The invention relates to a DCS charging control method of producing PVC paste resin by polymerizer, comprising: a DCS controlling the charging process of pure water, vinyl chloride monomer, an emulsifier, an initiator a and an initiator b, including parameters of the preset charging time of each material, the charging amount of each material, flow velocity adjusting time A, material charging percentage deviation B, a charging percentage setting value C, a regulating valve assignment valve D and delay time E; after charging, calculating a theoretical charging flow velocity according to the preset charging time and the charging amount of each material, and after the flow velocity adjusting time, recalculating a theoretical charging flow velocity according to a residual material amount and residual charging time; and when the charging percentage of the emulsifier, the initiator a and the initiator b reaches the charging percentage setting value C, switching a charging regulating valve to an assigned valve location D, delaying time to the delay time E, and determining the closure of system charging when the delay time E is up. The method can automatically adjust a charging velocity according to material and charging time residual conditions, thereby improving charging system automation and control accuracy.

Description

technical field [0001] The invention relates to a method for producing polyvinyl chloride paste resin from a polymerization kettle, in particular to a method for controlling the feeding of DCS for producing polyvinyl chloride paste resin from a polymer kettle. Background technique [0002] At present, the 48m³ polymerization kettle additives for the production of polyvinyl chloride paste resin are prepared in one kettle and one preparation, that is, the preparation personnel prepare the materials according to the set formula, and all the prepared auxiliary solutions need to be added into the polymerization kettle. During the feeding process, it is necessary to precisely control the feeding rate of pure water, monomer, emulsifier, initiator a, and initiator b, so that the five materials can be fed at the same time. The existing control method is: according to the set feeding time and the theoretical preparation solution amount, the feeding flow rate is calculated as the set v...

AI Technical Summary

Problems solved by technology

During the whole feeding process, personnel adjustments are frequent, the workload is heavy, and the accuracy is poor

[0004] In this feeding process, the feeding of emulsifier, initiator a, and initiator b is completed based on the lower limit of the current of each additive feeding pump. Because the power of the feeding pump is small, the pump current is small, and the difference between the pump idling current and the actual operating current is not large. At the same time, a certain error is introduced in the transmission process of the pump current signal, which leads to the inaccurate end point of additive feeding, and often produces the following problems: 1. The system determines the end point but there is still material in the additive tank; 2. There is no material in the additive tank , but because the pump current does not reach the lower limit, the system has not determined the end point

Operator intervention is required