本文選題：甲烷氧化菌懸浮液　切入點(diǎn)：氣泡動(dòng)力學(xué)　出處：《中國(guó)礦業(yè)大學(xué)》2017年碩士論文

【摘要】：在煤礦開采過程中,以游離或附著狀態(tài)存在于煤體或圍巖中的甲烷氣體會(huì)被稀釋排空以確保安全生產(chǎn)。然而,這不僅造成了能源的浪費(fèi),更將加劇溫室效應(yīng)。甲烷是僅次于二氧化碳的第二大溫室氣體,但是甲烷促使氣候變暖的潛力要比二氧化碳大25~30倍。近年來,隨著生物工程和環(huán)境工程等技術(shù)領(lǐng)域的快速發(fā)展,采用生化轉(zhuǎn)化技術(shù)進(jìn)行煤礦瓦斯治理已成為一個(gè)極具前瞻性和挑戰(zhàn)性的新興研究領(lǐng)域。本文以甲烷氧化菌生化降解瓦斯中含有的甲烷為研究背景,系統(tǒng)地研究了多尺度生化反應(yīng)器內(nèi)甲烷氧化菌菌懸液中的氣泡動(dòng)力學(xué)特性,以及多尺度生化反應(yīng)器條件下甲烷和氧氣混合氣的傳輸特性。本文采用可視化的實(shí)驗(yàn)方法,通過改變氣體流量、菌液濃度、毛細(xì)管內(nèi)徑、朝向、中心距等參數(shù),在不同尺度的生化反應(yīng)器內(nèi),研究了氣泡在生長(zhǎng)、脫離、涌入、聚并和上升運(yùn)動(dòng)等過程中的動(dòng)力學(xué)行為。實(shí)驗(yàn)的研究結(jié)果為不同尺度的生化反應(yīng)器中布?xì)馄鞯脑O(shè)計(jì)和生化反應(yīng)器的運(yùn)行提供理論指導(dǎo)。得到的主要結(jié)論如下:(1)甲烷氧化菌在氣液界面附近向甲烷和氧氣濃度較高處運(yùn)動(dòng)并富集,甲烷和氧氣的氣體體積混合比為1:1、菌體濃度越高、氣泡初始體積越小時(shí),越有利于氣泡內(nèi)部氣體的傳輸和降解。(2)氣泡涌入使氣泡界面發(fā)生震蕩,強(qiáng)化氣液界面處的傳質(zhì)效果;氣體流量對(duì)氣泡的分離體積和等效直徑?jīng)]有影響。(3)聚并后,由于氣泡體系內(nèi)總的表面積減少,表面能轉(zhuǎn)變成機(jī)械能,氣泡開始發(fā)生劇烈的震蕩。受限空間內(nèi),氣泡聚并后,主氣泡與前后側(cè)壁面相接觸,當(dāng)主氣泡界面上的震蕩波與壁面接觸時(shí),能量損失較大。(4)氣體的流量和液體流量對(duì)微通道內(nèi)氣泡的流型具有重要影響,并對(duì)甲烷氧化菌降解甲烷氣體產(chǎn)生影響。
[Abstract]:In the process of coal mining, methane gas which exists in coal body or surrounding rock in free or attached state will be diluted and emptied to ensure safe production.However, this will not only cause a waste of energy, but will also exacerbate Greenhouse Effect.Methane is the second largest greenhouse gas after carbon dioxide, but its potential to contribute to global warming is 25 to 30 times greater than carbon dioxide.In recent years, with the rapid development of biological engineering and environmental engineering, the application of biochemical transformation technology in coal mine gas control has become a very prospective and challenging emerging research field.Based on methane contained in methane oxidizing bacteria biodegradable gas, the bubble dynamics characteristics of methane oxidizing bacteria suspension in a multi-scale biochemical reactor were systematically studied in this paper.And the transport characteristics of methane and oxygen mixture in multiscale biochemical reactor.In this paper, by changing the parameters of gas flow rate, bacterial liquid concentration, capillary diameter, orientation, center distance, and so on, we studied the bubble growth, separation and influx in biochemical reactor at different scales by using visual experimental method, and by changing the parameters, such as gas flow rate, bacterial liquid concentration, capillary diameter, orientation, center distance and so on.Dynamic behavior in processes such as coalescence and ascending motion.The experimental results provide theoretical guidance for the design of gas dispensers and the operation of biochemical reactors at different scales.Due to the reduction of the total surface area and the conversion of surface energy into mechanical energy, the bubble began to vibrate violently.In the confined space, the main bubble is in contact with the front and rear sidewall after the bubble is coalesced. When the shock wave on the main bubble interface is in contact with the wall, the energy loss is larger. 4) the flow rate of the gas and the flow rate of the liquid have an important influence on the flow pattern of the bubble in the microchannel.The degradation of methane gas by methane-oxidizing bacteria was also affected.
【學(xué)位授予單位】：中國(guó)礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TD712

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相關(guān)期刊論文 前5條

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本文編號(hào)：1691728