本文選題：發(fā)射光譜診斷技術(shù)　切入點(diǎn)：熱等離子體　出處：《浙江大學(xué)》2017年碩士論文

【摘要】：熱等離子體具有電熱轉(zhuǎn)化效率高、反應(yīng)溫度高、能量密度集中、氣氛環(huán)境可調(diào)控等特點(diǎn),是一種前沿的化工強(qiáng)化手段,被廣泛應(yīng)用于乙炔、合成氣的制備及固體廢棄物處理等方面。熱等離子體反應(yīng)器內(nèi)的溫度分布情況是影響反應(yīng)效率的關(guān)鍵性因素,然而熱等離子體的溫度可達(dá)2000～20000 K,同時反應(yīng)器往往要求具有良好的氣密性,這使得反應(yīng)器內(nèi)的溫度分布難以通過常規(guī)檢測手段獲得。本文首次采用發(fā)射光譜診斷技術(shù)對磁旋轉(zhuǎn)弧等離子體炬內(nèi)純氣體進(jìn)料狀況下以及涉及化學(xué)反應(yīng)進(jìn)料狀況下的溫度分布進(jìn)行實(shí)驗(yàn)研究,結(jié)合計(jì)算機(jī)模擬研究結(jié)果,闡明了操作條件對溫度分布和產(chǎn)物組成的影響規(guī)律,揭示了磁旋轉(zhuǎn)弧等離子體炬這類熱等離子體反應(yīng)器的獨(dú)特優(yōu)勢和發(fā)展?jié)摿�。采用發(fā)射光譜診斷技術(shù)對純氬氣進(jìn)料條件下的磁旋轉(zhuǎn)弧等離子體進(jìn)行診斷,探究了不同操作條件對等離子體溫度的影響。研究表明,等離子體溫度與電子溫度近似相等,在10000K以上。提高輸入功率以及減小進(jìn)氣量均可以提高等離子體溫度,增加磁感應(yīng)強(qiáng)度有利于形成均勻的熱等離子體。采用Fluent軟件對該體系的溫度分布進(jìn)行計(jì)算流體力學(xué)模擬,所得結(jié)果與實(shí)驗(yàn)符合良好。利用磁旋轉(zhuǎn)弧等離子炬重整甲烷二氧化碳制取合成氣,采用發(fā)射光譜診斷技術(shù)研究等離子炬內(nèi)的溫度分布信息。研究表明,隨著原料中CH_4濃度的增加,CH_4轉(zhuǎn)化率和CO選擇性持續(xù)降低,H_2選擇性持續(xù)上升,而CO_2的轉(zhuǎn)化率則先增后減,等離子體溫度隨之下降;隨著輸入功率的增加,CH_4轉(zhuǎn)化率、CO_2轉(zhuǎn)化率、CO選擇性都呈現(xiàn)上升趨勢,而H_2選擇性則先上升后下降,等離子體溫度隨之上升;隨著磁感應(yīng)強(qiáng)度增加,原料轉(zhuǎn)化率和產(chǎn)物選擇性上升,熱等離子體溫度分布更加均勻。通過Chemkin-PRO軟件對磁旋轉(zhuǎn)弧等離子炬重整甲烷二氧化碳的轉(zhuǎn)化率、收率和溫度進(jìn)行數(shù)值模擬,不同CH_4/CO_2比例下CH_4轉(zhuǎn)化率和H_2收率的模擬結(jié)果與實(shí)驗(yàn)符合良好,CO_2轉(zhuǎn)化率及CO收率在變化趨勢上與實(shí)驗(yàn)較為一致。隨著輸入功率、體系壓力以及陽極內(nèi)徑的增加,CH_4轉(zhuǎn)化率、CO_2轉(zhuǎn)化率、H_2收率以及CO收率均隨之增加,但過高的輸入功率對反應(yīng)進(jìn)行程度的促進(jìn)作用有限。模擬得到的溫度與發(fā)射光譜法診斷所得的溫度存在約1000K的偏差,但其變化趨勢非常吻合。
[Abstract]:Thermal plasma has the characteristics of high efficiency of electrothermal conversion, high reaction temperature, concentration of energy density and controllable atmosphere, etc. It is a kind of advanced chemical strengthening method, which is widely used in acetylene. The temperature distribution in the hot plasma reactor is the key factor that affects the reaction efficiency, such as the preparation of syngas and the treatment of solid waste. However, the temperature of hot plasma can reach 2000 ~ 20000 K, and the reactor often requires good airtightness. This makes it difficult to obtain the temperature distribution in the reactor by conventional means of detection. In this paper, the emission spectrum diagnosis technique is used for the first time in the case of pure gas feed in the magnetic rotating arc plasma torch and the chemical reaction feed condition. The temperature distribution is studied experimentally. Based on the results of computer simulation, the effects of operating conditions on temperature distribution and product composition are illustrated. The unique advantages and development potential of magnetic rotating arc plasma torch are revealed. The magnetic rotating arc plasma under the condition of pure argon gas feed is diagnosed by using the emission spectrum diagnostic technique. The effect of different operating conditions on plasma temperature is investigated. The results show that the plasma temperature is approximately equal to electron temperature, above 10000K. The plasma temperature can be increased by increasing input power and reducing air intake. Increasing the intensity of magnetic induction is beneficial to the formation of homogeneous thermal plasma. The temperature distribution of the system is simulated by computational fluid dynamics (CFD) with Fluent software. The results are in good agreement with the experimental results. The temperature distribution in the plasma torch is studied by using the emission spectrum diagnostic technique to study the temperature distribution in the plasma torch by reforming methane carbon dioxide with magnetic rotating arc plasma torch to produce syngas. With the increase of CH_4 concentration in feedstock, the conversion of CH4 and the selectivity of CO continued to decrease, while the conversion of CO_2 increased first and then decreased, and the plasma temperature decreased. With the increase of the input power, the CO selectivity of Ch _ 4 conversion and CO _ 2 conversion increased, while the H _ S _ 2 selectivity first increased and then decreased, and the plasma temperature increased, and with the increase of magnetic induction intensity, the conversion of raw material and the selectivity of the product increased. The temperature distribution of thermal plasma is more uniform. The conversion, yield and temperature of methane carbon dioxide reforming by magnetic rotating arc plasma torch are simulated by Chemkin-PRO software. The simulated results of the conversion of CH_4 and the yield of Hap2 at different CH_4/CO_2 ratios are in good agreement with the experimental results, and are consistent with the experimental results with the input power, and the CO yield and the conversion of CO2 are in good agreement with the experimental results. The pressure of the system and the inside diameter of the anode increased with the increase of the conversion of CHS _ 4 and the yield of CO _ (2) and H _ (2) as well as the yield of CO. However, the effect of high input power on the degree of reaction is limited. The simulated temperature has a deviation of about 1000K from the temperature diagnosed by the emission spectrometry, but the variation trend is very consistent.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TE665.3;O657.3

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 潘騰云;聞光東;張治國;任其龍;蘇寶根;;CO_2旋轉(zhuǎn)弧等離子體炬煤氣化制取合成氣[J];化學(xué)反應(yīng)工程與工藝;2016年05期

2 蘇寶根;吳劍驊;聞光東;馬杰;房建威;邢華斌;任其龍;;熱等離子體裂解丙烷制乙炔數(shù)學(xué)模擬[J];化學(xué)反應(yīng)工程與工藝;2016年04期

3 張婧;王東江;張家良;郭洪臣;;大氣壓下甲烷火花放電制乙炔和合成氣[J];燃料化學(xué)學(xué)報(bào);2015年02期

4 安連彤;孫成琪;高陽;;量熱探針在熱等離子射流測量中的應(yīng)用[J];計(jì)量學(xué)報(bào);2014年05期

5 吳海銘;吳紅軍;苑丹丹;王寶輝;張磊;;天然氣轉(zhuǎn)化制備合成氣研究進(jìn)展[J];化學(xué)工業(yè)與工程技術(shù);2014年03期

6 蘇鐵;陳爽;楊富榮;陳力;鄭堯邦;;雙色平面激光誘導(dǎo)熒光瞬態(tài)燃燒場測溫實(shí)驗(yàn)[J];紅外與激光工程;2014年06期

7 石s，

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