【摘要】：有效地利用垃圾填埋氣,不僅能減少溫室氣體的排放,而且能有效地緩解我國(guó)能源短缺問題。合成氣是一種用途廣泛的化工原料,其主要成分是一氧化碳和氫氣。利用填埋氣中的甲烷和二氧化碳制合成氣,具有節(jié)能、環(huán)保雙重意義。本文將多孔介質(zhì)運(yùn)用到填埋氣制合成氣的過程中,設(shè)計(jì)了一種多孔介質(zhì)反應(yīng)器。利用多孔介質(zhì)反應(yīng)器具有燃燒穩(wěn)定好、燃燒溫度高等特點(diǎn),在不加熱源和催化劑的條件下,實(shí)現(xiàn)填埋氣的再生利用。本文主要包括以下幾個(gè)方面的工作:首先,采用吉布斯自由能最小法對(duì)填埋氣重整制合成氣的熱力學(xué)過程進(jìn)行計(jì)算,分析各因素對(duì)重整制合成氣過程的影響,找出填埋氣重整反應(yīng)合適的條件范圍。研究結(jié)果表明:高溫條件不僅有利于4CH和2CO轉(zhuǎn)化為2H和CO,而且可以抑制積碳的產(chǎn)生;往填埋氣中加入少量的2O,有助于消除積碳,但是加入2O會(huì)導(dǎo)致合成氣的產(chǎn)量減少,二氧化碳轉(zhuǎn)化率降低。綜合考慮,填埋氣重整在溫度為1173K-1373K范圍內(nèi),2 4 2O/CH/CO=0.1/1/0.8-0.2/1/1條件下轉(zhuǎn)化率高,合成氣產(chǎn)量大,積碳少。其次,建立預(yù)混氣體在多孔介質(zhì)內(nèi)反應(yīng)的數(shù)學(xué)模型,通過實(shí)驗(yàn)驗(yàn)證了模型的可靠性,并分析了填埋氣在多孔介質(zhì)內(nèi)的燃燒特性。研究表明:進(jìn)口氣體當(dāng)量比以及流速是影響火焰駐定的關(guān)鍵因素;漸變型多孔介質(zhì)具有燃燒溫度高、燃燒穩(wěn)定性好等特點(diǎn)。綜合以上研究結(jié)果,本文最后設(shè)計(jì)了一種漸變型多孔介質(zhì)反應(yīng)器,探究了多孔介質(zhì)反應(yīng)器內(nèi)填埋氣重整制合成氣的計(jì)算過程,并對(duì)填埋氣重整制合成氣的產(chǎn)量進(jìn)行分析。結(jié)果表明:4 2CH/CO=1,過量空氣系數(shù)為0.4時(shí),填埋氣制合成氣的產(chǎn)量最高。1mol的填埋氣制0.55mol2H、0.60mol CO,氫氣和一氧化碳的選擇性分別為0.55和0.82。此外,填埋氣中甲烷含量越高越有利于合成氣的產(chǎn)量的提高。2H/CO摩爾比隨4 2CH/CO增大而增大,可以通過調(diào)節(jié)4 2CH/CO來制不同2H/CO摩爾比來滿足不同的工業(yè)生成要求。
[Abstract]:The effective use of landfill gas can not only reduce the greenhouse gas emissions, but also effectively alleviate the energy shortage in China. Syngas is a widely used chemical raw material, its main components are carbon monoxide and hydrogen. Using methane and carbon dioxide in landfill gas to produce syngas has the dual significance of energy saving and environmental protection. In this paper, a porous medium reactor is designed by applying porous medium to landfill gas to produce syngas. The porous medium reactor has the characteristics of good combustion stability and high combustion temperature. The landfill gas can be regenerated without heating the source and catalyst. This paper mainly includes the following aspects: firstly, the thermodynamic process of landfill gas reforming to syngas is calculated by Gibbs free energy minimization method, and the influence of various factors on the process of reforming to syngas is analyzed. Find out the suitable condition range of landfill gas reforming reaction. The results show that the high temperature condition is not only favorable to the conversion of 4CH and 2CO to 2H and CO, but also to the inhibition of carbon deposition, and the addition of a small amount of 2O to the landfill gas will help to eliminate the carbon deposition, but the addition of 2O will lead to a decrease in the production of syngas. The conversion rate of carbon dioxide decreased. Considering synthetically, the landfill gas reforming has high conversion rate, large synthetic gas output and less carbon deposition under the condition of 1173K-1373K temperature of 24 2O/CH/CO=0.1/1/0.8-0.2/1/1. Secondly, the mathematical model of the reaction of premixed gas in porous media is established. The reliability of the model is verified by experiments, and the combustion characteristics of landfill gas in porous media are analyzed. The results show that the inlet gas equivalent ratio and the flow rate are the key factors affecting the flame setting, and the gradual porous media has the characteristics of high combustion temperature and good combustion stability. Based on the above results, a kind of gradual porous medium reactor is designed, and the calculation process of landfill gas reforming to syngas in porous medium reactor is explored, and the output of landfill gas reforming to syngas is analyzed. The results showed that when the excess air coefficient was 0.4, the selectivity of landfill gas to 0.55 mol / CO, hydrogen and carbon monoxide was 0.55 and 0.82, respectively. In addition, the higher the methane content in landfill gas is, the higher the yield of syngas is. 2H / CO molar ratio increases with the increase of 4 2CH/CO. Different 2H/CO molar ratio can be prepared by adjusting 4 2CH/CO to meet different industrial production requirements.
【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
【分類號(hào)】：TE665.3

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 袁怡祥;馬人熊;譚春青;;生活垃圾填埋氣的利用[J];節(jié)能與環(huán)保;2010年02期

2 姜海;趙平輝;陳義良;劉明侯;;雙層多孔介質(zhì)內(nèi)預(yù)混燃燒的實(shí)驗(yàn)和二維數(shù)值模擬[J];工程熱物理學(xué)報(bào);2009年05期

3 徐占林,畢穎麗,甄開吉;甲烷催化二氧化碳重整制合成氣反應(yīng)研究進(jìn)展[J];化學(xué)進(jìn)展;2000年02期

4 郝世雄;余祖孝;劉興勇;;甲烷二氧化碳催化重整制合成氣研究進(jìn)展[J];化學(xué)世界;2010年05期

5 李麗丹;鐘u&;;利用垃圾填埋沼氣發(fā)電 走垃圾資源化道路[J];江蘇環(huán)境科技;2006年S2期

6 黃毅;何強(qiáng);;我國(guó)垃圾填埋氣的產(chǎn)生和利用狀況研究[J];四川理工學(xué)院學(xué)報(bào)(自然科學(xué)版);2008年01期

7 饒文濤;;第三代燃燒新技術(shù)-多孔介質(zhì)燃燒技術(shù)研發(fā)及應(yīng)用[J];四川冶金;2010年06期

8 馬培勇;唐志國(guó);蔡萬大;;氣流通過泡沫陶瓷的流阻實(shí)驗(yàn)與模型研究[J];天然氣工業(yè);2010年11期

9 石磊,趙由才,牛冬杰;垃圾填埋氣的凈化技術(shù)進(jìn)展[J];天然氣化工;2004年02期

10 M.Rezaei;S.M.Alavi;S.Sahebdelfar;Zi-Feng Yan;;Syngas Production by Methane Reforming with Carbon Dioxide on Noble Metal Catalysts[J];Journal of Natural Gas Chemistry;2006年04期

相關(guān)博士學(xué)位論文 前10條

1 劉慧;多孔介質(zhì)內(nèi)預(yù)混氣體燃燒的實(shí)驗(yàn)和數(shù)值模擬研究[D];東北大學(xué);2010年

2 王恩宇;氣體燃料在漸變型多孔介質(zhì)中的預(yù)混燃燒機(jī)理研究[D];浙江大學(xué);2004年

3 張根p，

本文編號(hào)：2214040