Study On Key Equipment And Technology For Continuous Production Of Liquid Energetic Materials

At present,the nitrification preparation of most liquid energetic materials has a fast reaction and strong exothermal nitrification process.Once the heat transfer is out of control,a malignant explosion accident will inevitably occur.Moreover,the conventional intermittent operation process can not be used for continuous production and separation,and the safety degree is low.The main purpose of this paper is to solve the continuous production process equipment and separation process equipment of liquid energetic materials.By combining CFD simulation technology with experiment,two kinds of micro chemical equipment of microchannel reactor and centrifugal separator are designed,which are directly used in the synthesis and ng post-processing process of bunena,proving the efficiency and safety of the equipment.(1)According to the principle of micro-reaction,micro impinging stream reactor and static mixed microreactor were designed and manufactured.The simulation was used to verify that the pressure loss of the micro impinging stream reactor was between 0.07 kPa and 0.36 kPa when the flow rate cfwas 10 mL/min,20 mL/min and 30 mL/min,and the pressure loss decreased significantly with the increase of the volume flow rate and hydraulic diameter of the inlet of the two streams.Based on the evaluation criteria of "Villermaux/Dushman" system,the optimal inlet volumetric flow ratio(R=1)and the inner hydraulic diameter(D =2 mm)of the inlet pipe are obtained,which are most conducive to the micro-mixing of the micro impinging stream reactor.The phase distribution of the static mixed microreactor was simulated intuitively.It was determined that the diameter of the micro-shaped column was set as 200μm,the transverse spacing was set as 100μm,and the longitudinal spacing was set as 200μm to achieve the best mixing effect.The product purity was increased from 93.0% to 98.1%,the yield was up to 87.1%,and the process efficiency was improved.(2)According to the post-treatment separation process of 2 kg/h nitroglycerin microchemical production line,a post-treatment centrifugal separator was designed and manufactured.The design principle formula and experience are given and the MATLAB program for calculating the drum of the separator is made according to the formula.The calculation results show that the length of the drum separation area is 4.133 cm,the inner diameter is 9.566 cm,the radius of the heavy phase weir plate is 3.9 mm-6.532 mm,the radius of the light phase weir is 3.8 mm,the liquid inlet radius is 2.5 mm,the maximum separation capacity is 110 ml/min,and the limit ratio of light phase to heavy phase is 0.2-5.CFD simulation was used to verify that the drum separation speed of 3000-4000 rpm and the heavy phase weir radius of 5 or 5.5 can meet the requirements of process separation.In ng post-treatment process,four centrifuges were made as the primary separation,water washing,alkali washing and second water washing process equipment of nitroglycerin.At the beginning of the first washing process,the temperature of deionized water was set at normal temperature,and the flow rate was set at 21 ml/min.The alkali water temperature was controlled at 40 ℃,the flow rate was set at 14 ml/min,and the mass fraction of sodium carbonate was 30%.The temperature of hot water washing was controlled at 35 ℃,and the flow rate was set at 14 ml/min.After four-stage washing and separation,the Abel value of the sample was Abel 0 for 17 min.In the process of post-treatment,the factors that can affect the stability of nitroglycerin are set up with on-line monitoring,remote control and safety valve for feedback regulation to ensure safety.