發(fā)布時(shí)間：2018-01-06 11:17

  本文關(guān)鍵詞：再生氣氛對(duì)活性焦吸附—熱再生活性影響的研究　出處：《貴州大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 吸附 再生 脫硫 脫硝 碳消耗

【摘要】：炭法煙氣脫硫脫硝技術(shù)是一種不耗水、無(wú)二次污染、可同時(shí)脫除多種污染物和回收硫資源的技術(shù),目前已應(yīng)用于多種工業(yè)煙氣的治理。然而,運(yùn)行過(guò)程中其存在運(yùn)行成本高和能耗高兩個(gè)問(wèn)題,限制了它的廣泛應(yīng)用。其中,運(yùn)行成本高主要是因?yàn)槲健偕^(guò)程中存在大量的碳損失,能耗高是因?yàn)樾枰^高的再生溫度。本文從尋找價(jià)格低廉的碳基吸附劑、提高吸附劑的脫硫脫硝性能、減少碳損失和降低熱再生溫度四個(gè)方面開(kāi)展實(shí)驗(yàn)研究,對(duì)比研究了價(jià)格低廉的蘭炭在煙氣脫硫脫硝領(lǐng)域的應(yīng)用前景,研究了吸附氣氛和吸附劑性質(zhì)對(duì)脫硫脫硝效率的影響,同時(shí)在不同的再生氣氛下分析升溫速率、再生溫度、氣體濃度和再生時(shí)間對(duì)吸附劑的熱再生活性和碳消耗的影響。本文選用已商業(yè)化應(yīng)用了的活性焦(AC-1)、活性炭(AC-2、AC-3),和煤的干餾副產(chǎn)物——蘭炭(AC-4)作為碳基吸附劑,在含水含氨氣氣氛、無(wú)水含氨氣氣氛和含水無(wú)氨氣氣氛下進(jìn)行脫硫脫硝實(shí)驗(yàn),討論吸附氣氛和吸附劑性質(zhì)對(duì)脫硫脫硝效率的影響。結(jié)果表明,在含水無(wú)氨氣氣氛下以AC-2、AC-3和AC-4的脫硝性能最佳,而在含水含氨氣氣氛下以AC-1和AC-4的脫硝性能最佳,主要是因?yàn)锳C-2和AC-3具有較大的比表面積,在含水含氨氣氣氛下能夠有效提高吸附劑的脫硫效率,可在吸附劑的表面生成大量的硫銨鹽,從而導(dǎo)致吸附劑的微孔堵塞,抑制了脫硝反應(yīng)的進(jìn)行。對(duì)在含水含氨氣氣氛下脫硫脫硝后的四種碳基吸附劑進(jìn)行加熱再生,從再生吸附劑的脫硝效率、脫硫效率和SO2回收率三方面比較四種碳基吸附劑的熱再生活性,并結(jié)合C/SO2(再生1 mol SO2所消耗C的量)對(duì)熱再生過(guò)程中的碳消耗進(jìn)行了分析。結(jié)果表明,經(jīng)一次加熱再生后,四種吸附劑的脫硫性能基本不變,AC-1的脫硝性能也基本不變,而AC-2、AC-3和AC-4的脫硝性能顯著降低,主要是因?yàn)榧訜嵩偕鷾p少了吸附劑表面活性官能團(tuán)的量,并對(duì)吸附劑的孔結(jié)構(gòu)產(chǎn)生了影響;加熱再生過(guò)程中,以AC-3的碳消耗最少,而以AC-2和AC-4的SO2回收率最高。另外,為減少化學(xué)碳消耗,可在較低溫度下對(duì)吸附劑進(jìn)行加熱再生,此時(shí)SO2回收率僅稍有降低。分別在氮?dú)鈿夥�、含水氣氛和含氨氣氣氛下�?duì)脫硫脫硝后的活性焦進(jìn)行加熱再生,討論升溫速率、再生溫度、氣體濃度和再生時(shí)間對(duì)活性焦熱再生活性和碳消耗的影響。結(jié)果表明,在再生氣氛中引入一定濃度的NH3,能夠提高再生活性焦的脫硫脫硝性能,減少熱再生過(guò)程中的碳消耗,但SO2回收率會(huì)顯著降低;當(dāng)引入水蒸氣時(shí),不能提高再生活性焦的脫硫脫硝性能,而使得熱再生過(guò)程中的碳消耗增加;再生條件中,以再生溫度對(duì)活性焦的脫硫脫硝效率和SO2回收率的影響最大,其次是升溫速率和再生時(shí)間,隨著再生溫度的升高,再生活性焦的脫硫效率和SO2回收率逐漸提高,但碳消耗也隨之增加。
[Abstract]:Carbon flue gas desulphurization and denitrification technology is a kind of technology which can remove many kinds of pollutants and recover sulfur resources simultaneously without water consumption and secondary pollution. It has been applied to the treatment of various industrial flue gas at present. The problems of high operating cost and high energy consumption in the process of operation limit its wide application. Among them, the high operating cost is mainly due to a large amount of carbon loss in the process of adsorption-regeneration. High energy consumption is due to the need for higher regeneration temperature. This paper from the search for low-cost carbon-based adsorbents to improve the desulfurization and denitrification performance of adsorbents reduce carbon loss and reduce the temperature of thermal regeneration four aspects of experimental research. The application prospect of low cost blue charcoal in flue gas desulfurization and denitrification was studied. The effects of adsorption atmosphere and adsorbent properties on desulfurization and denitrification efficiency were studied. At the same time, the heating rate was analyzed in different regeneration atmosphere. Effects of regeneration temperature, gas concentration and regeneration time on thermal regeneration activity and carbon consumption of adsorbents. The desulfurization and denitrification experiments were carried out in the atmosphere of water containing ammonia, anhydrous ammonia and water and ammonia without ammonia as carbon-based adsorbents, and the by-product of coal distillation (AC-4) was used as a carbon-based adsorbent. The desulfurization and denitrification experiments were carried out in the atmosphere of water containing ammonia, water containing ammonia and water and no ammonia. The effects of adsorption atmosphere and adsorbent properties on desulphurization and denitrification efficiency were discussed. The results showed that AC-2AC-3 and AC-4 had the best denitrification performance in the presence of water and ammonia. AC-1 and AC-4 have the best denitrification performance in the atmosphere of water and ammonia, mainly because AC-2 and AC-3 have larger specific surface area. The desulfurization efficiency of the adsorbent can be improved effectively in the atmosphere of water and ammonia, and a large amount of ammonium sulfate can be produced on the surface of the adsorbent, resulting in the micropore blockage of the adsorbent. Four carbon-based adsorbents after desulphurization and denitrification in aqueous ammonia atmosphere were heated and regenerated from the denitrification efficiency of regenerated adsorbents. The thermal regeneration activities of four carbon-based adsorbents were compared in terms of desulfurization efficiency and SO2 recovery. The carbon consumption during thermal regeneration was analyzed by using C / so _ 2 (the amount of C consumed by regenerated 1 mol SO2). The desulphurization performance of the four adsorbents was basically unchanged, and the denitrification performance of AC-2AC-3 and AC-4 was significantly decreased. The main reason is that heating regeneration reduces the amount of surface active functional groups of adsorbent and influences the pore structure of adsorbent. In the process of heating regeneration, the carbon consumption of AC-3 was the least, and the recovery of SO2 from AC-2 and AC-4 was the highest. In addition, to reduce the consumption of chemical carbon. The adsorbent can be heated and regenerated at lower temperature, and the recovery rate of SO2 is only slightly reduced. The activated coke after desulfurization and denitrification is heated and regenerated in nitrogen atmosphere, water atmosphere and ammonia atmosphere, respectively. The effects of heating rate, regeneration temperature, gas concentration and regeneration time on the thermal regeneration activity and carbon consumption of activated pyrolysis were discussed. The results showed that a certain concentration of NH3 was introduced into regeneration atmosphere. It can improve the desulfurization and denitrification performance of regenerated active coke and reduce the carbon consumption in the process of thermal regeneration, but the SO2 recovery rate will be significantly reduced. When water vapor was introduced, the desulfurization and denitrification performance of regenerated active coke could not be improved, but the carbon consumption in the process of thermal regeneration was increased. In regeneration conditions, regeneration temperature has the greatest influence on desulfurization and denitrification efficiency and SO2 recovery rate of activated coke, followed by heating rate and regeneration time, with the increase of regeneration temperature. The desulfurization efficiency and SO2 recovery of regenerated activated coke increased gradually, but the carbon consumption also increased.
【學(xué)位授予單位】：貴州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：X701;TQ424.1

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相關(guān)期刊論文 前2條

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本文編號(hào)：1387622