本文選題：正壓型防爆電氣　切入點(diǎn)：數(shù)值模擬　出處：《華南理工大學(xué)》2015年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：石油、化工等企業(yè)在爆炸危險(xiǎn)環(huán)境中使用的電器產(chǎn)品,正常工作時(shí)會(huì)產(chǎn)生電弧、火花和危險(xiǎn)高溫,一旦環(huán)境中的可燃性混合物的濃度達(dá)到爆炸極限,就有可能引起爆炸。因此,這些電氣產(chǎn)品有必要設(shè)計(jì)成防爆型電氣設(shè)備。本文對(duì)現(xiàn)有的冷凝器膠球清洗系統(tǒng)進(jìn)行防爆研究,使其能夠在爆炸性氣體環(huán)境中安全工作,不會(huì)引燃引爆危險(xiǎn)氣體。本文首先依據(jù)防爆電氣的標(biāo)準(zhǔn),結(jié)合膠球清洗系統(tǒng)所在的危險(xiǎn)區(qū)域和可能存在的易燃易爆氣體確定防爆類(lèi)型和防爆電氣設(shè)備的級(jí)別,確定對(duì)外殼、溫度極限、安全措施、安全裝置和保護(hù)氣體的具體要求,并將產(chǎn)品分為布?xì)庀到y(tǒng)、壓力采集系統(tǒng)和正壓控制系統(tǒng)三個(gè)主要部分。其次,研究了布?xì)庀到y(tǒng)和壓力采集系統(tǒng)的結(jié)構(gòu)。采用了更為節(jié)省成本的換氣管路和器件組成;用Fluent模擬方法從四個(gè)進(jìn)氣口位置確定最優(yōu)的進(jìn)氣口和壓力采集系統(tǒng)傳感器放置位置;從模擬結(jié)果顯示其他三個(gè)位置達(dá)到要求的時(shí)間比S3位置多了60%-100%,可知進(jìn)氣口、排氣口位置能夠在很大程度上決定換氣的質(zhì)量,進(jìn)而結(jié)合模擬的數(shù)據(jù)分析結(jié)果不同的原因;通過(guò)對(duì)二氧化碳質(zhì)量分?jǐn)?shù)和壓力測(cè)量結(jié)果與模擬結(jié)果的趨勢(shì)對(duì)比,確定模擬中的模型和參數(shù)設(shè)置與實(shí)際情況較為接近。最后,構(gòu)建了膠球清洗系統(tǒng)防爆控制系統(tǒng)平臺(tái)。采用Linux和Qt嵌入式系統(tǒng)設(shè)計(jì)了具有圖形交互界面的正壓控制系統(tǒng),實(shí)現(xiàn)了系統(tǒng)接受指令和實(shí)時(shí)顯示氣壓的功能,程序運(yùn)行效果良好。具體包括:利用busybox開(kāi)發(fā)了yaffs格式的根文件系統(tǒng);完成了tslib庫(kù)的編譯和移植;完成了Qt的移植;完成了目標(biāo)機(jī)的環(huán)境配置;實(shí)現(xiàn)了充氣過(guò)程、正壓過(guò)程、斷電功能以及異常處理功能的界面和程序;完成了GPIO、I2C驅(qū)動(dòng)的編寫(xiě)。
[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.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TD684

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