硝基胍喷雾干燥过程连续计量加料技术  

Continuous Metering and Feeding Technology in Nitroguanidine Spray Drying Process

作　　者：梁金华 邓国栋[1] 王伟斌 谢亮 王照轩 LIANG Jinhua;DENG Guodong;WANG Weibin;XIE Liang;WANG Zhaoxuan(National Special Superfine Powder Engineering Research Center,Nanjing University of Science and Technology,Jiangsu Nanjing210094)

机构地区：[1]南京理工大学国家特种超细粉体工程技术研究中心,江苏南京210094

出　　处：《爆破器材》2022年第6期9-15,21,共8页Explosive Materials

基　　金：国防火炸药科研专项项目。

摘　　要：在硝基胍(NQ)喷雾干燥加料过程中,为实现连续、安全、均匀、稳定地计量加料,对NQ喷雾干燥加料系统开展在线浓度、流量与干量计量检测的试验研究。采集不同浓度下的NQ浆料与纯NQ光谱,对比不同预处理方法的优化效果,采用偏最小二乘法选择特征区域建立加料浓度模型,并对模型进行重复性验证。选择一阶导数加标准正态变量变换方法对原始光谱进行预处理,在6857~6426 cm^(-1)和5119~4257 cm^(-1)两个波段内建立NQ加料浓度的定量模型,校正和预测的决定系数(R_(c)^(2)、R_(p)^(2))分别为0.9927和0.9870;校正和预测的均方根误差(R_(MSEC)、R_(MSEP))分别为0.256和0.340;对建立的校正模型进行外部验证,其检测浓度平均偏差为0.21%。研究了不同管道压力对直管型质量流量计流量测量的影响,确定最佳的进料压力范围:当管道压力在0.40~0.45 MPa范围内,流量检测误差均小于0.50%,满足质量流量计的检测要求;且在0.40 MPa时,流量测量误差最小,为0.37%。研究了NQ喷雾干燥在线连续计量加料系统在不同浓度、不同工作时间下的计量精度,该系统在6组不同浓度、10个不同工作时间下的干量计量误差均不大于1.00%,表明该系统可稳定、可靠地实现NQ在线连续干量计量。To ensure continuous,safe,uniform and stable metering and feeding of nitroguanidine(NQ)in the spray drying process,experimental study on online measurement of concentration,flow and dry volume of NQ spray drying feeding system was carried out.The spectra of NQ slurry and pure NQ with different concentrations were collected,and the optimization effect of different pretreatment methods was compared.Partial least square(PLS)was used to develop the feeding concentration model based on specific spectral intervals,and repeatability of the developed model was validated.First-derivative add standard normal variate transformation was selected to preprocess the raw spectra,and the wavebands over the ranges from 6857 cm^(-1) to 6426 cm^(-1) and 5119 cm^(-1) to 4257 cm^(-1) were used to constrict the quantitative model of NQ feeding concentration.Determination coefficient of correction and prediction(R_(c)^(2) and R_(p)^(2))of the developed model are 0.9927 and 0.9870,respectively.Root mean square error of corrected and predicted(R_(MSEC) and R_(MSEP))of the developed model are 0.256 and 0.340,respectively.The established calibration model was externally verified,and average deviation of the detected concentration was 0.21%.The influence of different pipe pressures on the flow test results of the straight pipe type mass flowmeter was studied,and the optimal range of feed pressure was determined.When the pipeline pressure is within 0.40-0.45 MPa,the flow measurement error is less than 0.50%,which meets the detection requirements of the mass flowmeter.At 0.40 MPa,the flow measurement error is the minimum,0.37%.Measuring accuracy of NQ spray drying online continuous metering feeding system under different concentrations and working hours was studied.Dry metering error of this system under 6 groups of different concentrations and 10 different working hours is no more than 1.00%,which shows that the system can stably and reliably realize NQ online continuous dry metering.

关 键 词：硝基胍 喷雾干燥 浓度 流量 计量 

分 类 号：TJ55[兵器科学与技术—军事化学与烟火技术] TQ560.6[化学工程—炸药化工]