Study On Devolatilization Ability Of Solid Propellants By Twin Screw Extruder

The devolatilization process of solid propellants refers to the removal of air and low molecular weight components that are introduced during production.In actual production,the devolatilization of solid propellants is not mature,and there is no perfect theoretical basis for devolatilization.In factories,conservative static devolatilizers are often used for devolatilization.For example,drop devolatilizers have lower costs and output.Can not meet the actual production needs.In view of this situation,the purpose of this paper is to develop a screw devolatilizer suitable for solid propellants.The main research work is as follows:1)This article refers to the devolatilization equipment design of the polymer and designs the prototype of the solid propellant devolatilization machine based on the calculated data requirements:Twin screw main engine,exhaust system,barrel split structure,hydraulic system,screw end Sealed and double supporting structure;2)The devolatilization principle of the polymer is summarized and improved in this paper,which makes it suitable for the devolatilization of solid propellants.The overview of foam devolatilization and diffusion devolatilization are summarized.According to the devolatilization mechanism,the evaluation index of devolatilization was established,which mainly included the change of pressure,shear rate and density of outlet material.3)This paper uses FLUENT fluid calculation software in ANSYS software package to calculate the design of the opposite meshing,co-directional meshing and non-intermeshing non-intermeshing twin-screw components,and a comparative internal comparison:In the intermeshing twin-screw devolatilizer,a total of six kinds of devolatilization screw elements were designed and analyzed to obtain the best devolatilization effect of the slotted screw element I.In the design of each element of the co-rotating intermeshing twin-screw devolatilizer,five components were designed to compare the devolatilization capacity in the intermeshing twin-screw devolatilizer and the final devolatilization capability was analyzed.It was found that the slotted screw element I was The best devolatilization effect.For an anisotropic non-intermeshing twin-screw devolatilizer,the three components were set to two different configurations under the same simulation conditions as the first two and a simulation calculation analysis was performed.Finally,it is found that the staggered arrangement of the narrow screw element is the best devolatilization effect.Finally,the comparison of the three types of devolatilizer elements yields the conclusion that the staggered arrangement of narrow spiral rib elements in the non-intermeshing twin-screw devolatilizer is the best devolatilization effect in all components.