冷凝器胶球清洗系统的防爆设计和研究

发布时间：2018-03-19 21:17

本文选题：正压型防爆电气　切入点：数值模拟　出处：《华南理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：石油、化工等企业在爆炸危险环境中使用的电器产品,正常工作时会产生电弧、火花和危险高温,一旦环境中的可燃性混合物的浓度达到爆炸极限,就有可能引起爆炸。因此,这些电气产品有必要设计成防爆型电气设备。本文对现有的冷凝器胶球清洗系统进行防爆研究,使其能够在爆炸性气体环境中安全工作,不会引燃引爆危险气体。本文首先依据防爆电气的标准,结合胶球清洗系统所在的危险区域和可能存在的易燃易爆气体确定防爆类型和防爆电气设备的级别,确定对外壳、温度极限、安全措施、安全装置和保护气体的具体要求,并将产品分为布气系统、压力采集系统和正压控制系统三个主要部分。其次,研究了布气系统和压力采集系统的结构。采用了更为节省成本的换气管路和器件组成;用Fluent模拟方法从四个进气口位置确定最优的进气口和压力采集系统传感器放置位置;从模拟结果显示其他三个位置达到要求的时间比S3位置多了60%-100%,可知进气口、排气口位置能够在很大程度上决定换气的质量,进而结合模拟的数据分析结果不同的原因;通过对二氧化碳质量分数和压力测量结果与模拟结果的趋势对比,确定模拟中的模型和参数设置与实际情况较为接近。最后,构建了胶球清洗系统防爆控制系统平台。采用Linux和Qt嵌入式系统设计了具有图形交互界面的正压控制系统,实现了系统接受指令和实时显示气压的功能,程序运行效果良好。具体包括:利用busybox开发了yaffs格式的根文件系统;完成了tslib库的编译和移植;完成了Qt的移植;完成了目标机的环境配置;实现了充气过程、正压过程、断电功能以及异常处理功能的界面和程序;完成了GPIO、I2C驱动的编写。
[Abstract]:Electrical products used by petroleum, chemical and other enterprises in explosive hazardous environments will produce electric arcs, sparks and dangerous high temperatures during normal operation. Once the concentration of flammable mixtures in the environment reaches the explosion limit, it may cause explosions. It is necessary for these electrical products to be designed as explosion-proof electrical equipment. In this paper, the existing condenser rubber ball cleaning system is studied to make it work safely in explosive gas environment. First, according to the standard of explosion-proof electricity, combined with the dangerous area of rubber ball cleaning system and the flammable and explosive gas that may exist, the explosion proof type and the class of explosion-proof electrical equipment are determined, and the shell is determined in this paper. Temperature limits, safety measures, safety devices and specific requirements for gas protection. The products are divided into three main parts: the gas distribution system, the pressure collection system and the positive pressure control system. The structure of the gas distribution system and the pressure acquisition system is studied. The more cost saving air exchange line and the components are adopted. The optimal position of the air inlet and the pressure acquisition system sensor is determined by Fluent simulation method from the four air inlet positions. The simulation results show that the other three positions reach the required time more than the S3 position 60-100. It is known that the air inlet and exhaust port position can determine the quality of the air exchange to a large extent, and then combined with the simulated data to analyze the reasons for the different results; By comparing the results of carbon dioxide mass fraction and pressure measurement with the simulation results, it is determined that the model and parameter settings in the simulation are close to the actual situation. The explosion-proof control system platform of rubber ball cleaning system is constructed, and the positive pressure control system with graphical interactive interface is designed by using Linux and QT embedded system, which realizes the functions of receiving instructions and displaying air pressure in real time. The program works well. It includes: using busybox to develop the root file system of yaffs format; to compile and transplant the tslib library; to complete the transplant of QT; to complete the environment configuration of the target machine; to realize the process of inflation and barotropic, The interface and program of power-off function and exception handling function are completed, and GPIOO I 2 C driver is written.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD684

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