本文選題：臭氧 + 介質(zhì)阻擋��； 參考：《南昌大學(xué)》2015年碩士論文

【摘要】：臭氧是氧的同素異形體,在常溫下,它是一種有特殊臭味的藍(lán)色氣體。臭氧具有強(qiáng)氧化性,且沒有二次污染,應(yīng)用前景誘人。但是臭氧產(chǎn)生是一個高耗低效過程,放電法產(chǎn)生臭氧所消耗的大部分電能轉(zhuǎn)化為熱量散發(fā)出去,這部分熱量會促使放電空間溫度升高,進(jìn)而分解產(chǎn)生的臭氧。因此臭氧發(fā)生器放電室溫度分布顯得至關(guān)重要。本文采用數(shù)值模擬手段對脈沖介質(zhì)阻擋放電臭氧放電室進(jìn)行傳熱模擬,并嘗試探索介質(zhì)阻擋放電的反應(yīng)機(jī)理。模擬分析結(jié)果如下:(1)氧氣進(jìn)入放電空間后,氣體溫度變化規(guī)律為:溫度沿著橫向上升,到達(dá)出口處氣體平均溫度略微降低,因為隨著反應(yīng)的進(jìn)行,電極通過熱傳遞給氣體,到達(dá)出口處,氣體與室外連通,所以溫度先逐漸升高,后略微降低。此外,氣體間隙溫度沿著縱向逐漸升高,到達(dá)底部升高明顯。由于有電介質(zhì)一端電極不易散熱,電介質(zhì)導(dǎo)熱性能差,導(dǎo)致溫度較高。有散熱片加大了散熱面積,電極把熱量通過熱傳導(dǎo)傳遞給鋁散熱片,有利于氣體間隙的溫度降低。不同氧氣進(jìn)氣速度與氣體間隙平均溫度存在著一定關(guān)系,提高流體的流速能有效的改善其散熱效果。通過改變橡膠厚度,提高放電寬度,降低放電空間的溫度。通過加風(fēng)扇,對臭氧發(fā)生器的外部空氣強(qiáng)制對流換熱,也能明顯的降低氣體間隙平均溫度。(2)在圓筒形臭氧發(fā)生器中,臭氧濃度在放電的初始階段呈現(xiàn)快速增長,達(dá)到峰值后,由于放電間隙中化學(xué)反應(yīng)放出的熱量難以排出,放電室中的溫度升高,使得生成的臭氧部分分解,臭氧濃度開始下降,直到臭氧的生成速率和分解速率達(dá)到平衡,臭氧濃度不再發(fā)生變化,達(dá)到穩(wěn)定值。高壓電極和低壓電極附近的氧原子濃度遠(yuǎn)低于放電間隙中心處的氧原子濃度,其在放電間隙中心處達(dá)到峰值,中心兩邊氧原子濃度基本呈對稱分布且隨距離的增加而逐漸減小,在電極附近達(dá)到最小值。
[Abstract]:Ozone is an oxygen isomorphism. At room temperature, it is a blue gas with a special odor. Ozone has strong oxidation and no secondary pollution, so its application prospect is attractive. However, ozone generation is a high-consumption and low-efficiency process. Most of the electricity consumed by the discharge process is converted into heat, which will cause the temperature of the discharge space to rise and then decompose the resulting ozone. Therefore, the temperature distribution in the discharge chamber of ozone generator is very important. In this paper, the numerical simulation method is used to simulate the heat transfer in the pulsed dielectric barrier discharge ozone chamber, and the reaction mechanism of the dielectric barrier discharge is explored. The simulation results are as follows: 1) when oxygen enters the discharge space, the gas temperature changes as follows: the temperature rises horizontally, and the average temperature of the gas reaches the outlet slightly lower, because as the reaction proceeds, the electrode transmits heat to the gas. At the exit, the gas is connected to the outside, so the temperature rises gradually and then drops slightly. In addition, the gas gap temperature increases gradually along the longitudinal direction, and increases obviously at the bottom. Because the dielectric electrode is not easy to dissipate heat, the dielectric thermal conductivity is poor, resulting in higher temperature. The radiator increases the radiating area, and the electrode transfers heat through heat conduction to the aluminum radiator, which is favorable to the decrease of the temperature of the gas gap. There is a certain relationship between the oxygen inlet velocity and the average temperature of the gas gap. Increasing the flow velocity of the fluid can effectively improve the heat dissipation effect. By changing the thickness of rubber, the discharge width is increased and the temperature of discharge space is reduced. By adding fans, the forced convection heat transfer of the external air of the ozone generator can also significantly reduce the average temperature of the gas gap. In the cylindrical ozone generator, the ozone concentration increases rapidly in the initial stage of the discharge and reaches the peak value. Because the heat released by chemical reaction in the discharge gap is difficult to excrete, and the temperature in the discharge chamber rises, the ozone produced partially decomposes, and the ozone concentration begins to decrease, until the formation rate and decomposition rate of ozone reach equilibrium. Ozone concentration does not change again, reaching a stable value. The oxygen atom concentration near the high voltage electrode and low pressure electrode is much lower than that at the center of the discharge gap, and it reaches the peak value at the center of the discharge gap. The oxygen atom concentration on both sides of the center is symmetrical distribution and decreases gradually with the increase of distance. The minimum value is reached near the electrode.
【學(xué)位授予單位】：南昌大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TQ123.2

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