Date of Publication:2022-10-10

Journal:安全与环境学报

Affiliation of Author(s):化工学院

Issue:3

Page Number:963-968

ISSN No.:1009-6094

Abstract:The paper is inclined to present a design project for the relief system to evade the overpressure induced by the reaction runaway of vinyl acetate polymerization which is known as a great risk for the reactor design and operation.In order to identify and determine the reaction runaway characteristics of the relief system and its size,we have managed to conduct a series of the runaway reactions of the vinyl acetate polymerization by using a VSP2 (Vent Sizing Package 2) adiabatic calorimeter imported from abroad.The emergency relief system of the specified vinyl acetate polymerization reactor we have developed has been designed by using Leung's method and the experimental testing data while we were making efforts in investigating the effects of the initiator mass fraction on the runaway reaction characteristics and on the safety relief size.The results of our research indicate that the initial exothermic temperature of the vinyl acetate polymerization should be kept at about 80 ℃.The adiabatic temperature rise of the reaction runaway system should be kept between 105 ℃ and 115 ℃.With the increase of the initiator mass fraction,both the maximum rate of temperature rise and the maximum rate of pressure rise are actually quite large.Judging by the experimental data,the emergency relief system for the said vinyl acetate polymerization runaway reaction is by nature a vapor system.In accordance with the Emergency Relief System (ERS) method offered by the Design Institute,the relief flow rate,the relief capacity,as well as the relief area for a specified vinyl acetate polymerization reactor can be determined by the Leung method and ERM.The emergency relief area tends to increase with the increase of the initiator mass fraction due to its prompt heat release characteristics at a fixed relief pressure and a specified maximum cumulative one.And,finally,the paper has also introduced the three target dimensionless parameters,that is,W*,G* and A* and an independent dimensionless parameter X*,indicating the initiator mass fraction.The algebraic equations of W*,G * and A * with X * prove to be fit for the said signs according to the experimental data.The fitting equations imply that the emergency relief area increases linearly with the initiator mass fraction under the proper experimental conditions.

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