發(fā)布時間：2018-05-10 16:56

  本文選題：便攜式氣相色譜儀 + COMSOL��； 參考：《哈爾濱工業(yè)大學(xué)》2015年碩士論文

【摘要】：氣相色譜儀是分析領(lǐng)域最重要的通用儀器之一,是分離和檢測樣品的重要工具。然而,傳統(tǒng)氣相色譜儀因其體積較大、重量較重、分析時間較長等不利因素存在,限制了其在現(xiàn)場分析檢測中的應(yīng)用。與傳統(tǒng)的實驗室氣相色譜儀相比,便攜式氣相色譜儀因其分析速度較快、體積較小、重量較輕等優(yōu)勢在現(xiàn)場快速分析檢測領(lǐng)域擁有著廣闊的市場需求。然而,由于國內(nèi)技術(shù)基礎(chǔ)比較薄弱、科研儲配人才較少、相關(guān)研究起步較晚等一系列原因,導(dǎo)致國內(nèi)的便攜式氣相色譜儀市場一直被安捷倫等國外的分析儀器生產(chǎn)商所壟斷。為打破國外的技術(shù)壟斷,開發(fā)出擁有自主知識產(chǎn)權(quán)的便攜式氣相色譜儀,本文進行了便攜式氣相色譜儀的開發(fā)和應(yīng)用研究,研制出了一種體積小、重量輕、分析速度快的便攜式氣相色譜分析儀器,以應(yīng)對各種條件下現(xiàn)場快速分析檢測的需求。首先,本文利用COMSOL Multiphysics數(shù)值仿真軟件對氣化室的氣流場和氫火焰離子化檢測器的靜電場進行了建模仿真。在模擬結(jié)果的指導(dǎo)下,對氣化室和氫火焰離子化檢測器的幾何模型進行了優(yōu)化設(shè)計,使得氣化室中的死體積區(qū)域大幅縮減,氫火焰離子化檢測器的帶電離子收集效率大幅提升。然后,基于PID控制原理進行了溫度控制模塊和氣路控制模塊的設(shè)計。采用實驗室開發(fā)的恒流源測溫電路和小功率加熱電路配合基于Lab VIEW軟件編寫的PID溫度控制程序完成了溫度控制模塊的設(shè)計,溫控精度可達0.1℃。而后采用商品化的電子壓力控制器配合基于Lab VIEW軟件編寫的PID壓力控制程序?qū)崿F(xiàn)了對壓力和流量的精確控制。最后,在各個模塊研究的基礎(chǔ)上進行了便攜式氣相色譜儀裝置的整體搭建,并對搭建好的便攜式氣相色譜儀裝置進行了性能測試。初步測試結(jié)果顯示,自制便攜式氣相色譜儀檢出限為1.861×10-8 g/s,定性重復(fù)性為2.152%,定量重復(fù)性為10.401%,在100 mg/L-2000 mg/L的濃度范圍內(nèi)表現(xiàn)出了良好的線性關(guān)系,其相關(guān)系數(shù)達到了0.9966。而后,應(yīng)用自制的便攜式氣相色譜儀結(jié)合膜萃取技術(shù)建立了海水中甲苯的快速檢測方法。檢測結(jié)果表明,通過膜萃取樣品預(yù)處理方法的運用,使得海水中甲苯可檢測的濃度值達到了1 mg/L,間接地提高了自制便攜式氣相色譜儀裝置對海水中甲苯的檢測范圍。
[Abstract]:Gas chromatograph is one of the most important universal instruments in the field of analysis. It is an important tool for the separation and detection of samples. However, because of its large volume, heavy weight and long analysis time, the traditional gas chromatograph has limited its application in field analysis and detection. Compared with the traditional laboratory gas chromatograph, the portable gas chromatograph has a broad market demand in the field of rapid analysis and detection because of its advantages of faster analysis speed, smaller volume and lighter weight. However, the domestic market of portable gas chromatograph has been monopolized by the manufacturers of analytical instruments, such as Agilent and other foreign manufacturers, due to a series of reasons, such as weak technical foundation, less talents in scientific research storage and matching, and the late start of related research. In order to break the technology monopoly of foreign countries and develop a portable gas chromatograph with independent intellectual property rights, the development and application of the portable gas chromatograph have been carried out in this paper. A kind of portable gas chromatograph has been developed, which is small in volume and light in weight. The portable gas chromatographic analysis instrument with high speed is used to meet the demand of field analysis and detection under various conditions. Firstly, the numerical simulation software COMSOL Multiphysics is used to model the gas flow field in the gasification chamber and the electrostatic field in the hydrogen flame ionization detector. Under the guidance of the simulation results, the geometric models of the gasification chamber and the hydrogen flame ionization detector are optimized. The dead volume region in the gasification chamber is greatly reduced, and the charged ion collection efficiency of the hydrogen flame ionization detector is greatly improved. Then, temperature control module and gas path control module are designed based on PID control principle. The temperature control module is designed by using the constant current source temperature measuring circuit developed in the laboratory and the low power heating circuit and the PID temperature control program based on Lab VIEW software. The temperature control precision can reach 0.1 鈩，

本文編號：1870113