【摘要】：在中國,大氣中的二氧化硫和氮氧化物主要來自于燃煤電廠,控制燃煤電廠氣體污染物排放是整個電力工業(yè)乃至國民經(jīng)濟(jì)可持續(xù)發(fā)展的必要條件。單獨采用脫硫工藝和脫硝工藝占地面積大,投資成本高,研究和開發(fā)一種同時脫硫脫硝的工藝是節(jié)省資源的一個熱點。Mg-Al氧化物由于其來源豐富,成本較低,作為吸附劑已經(jīng)得到很多的應(yīng)用,在同時脫硫脫硝方面有很大的潛力。減小粒徑是提高M(jìn)g-Al氧化物脫硫脫硝效率的一個突破點。本文通過固相法和熔鹽法分別制備不同Mg/Al摩爾比的Mg-Al復(fù)合氧化物,并在濕法反應(yīng)器上進(jìn)行同時脫硫脫硝的實驗。發(fā)現(xiàn)當(dāng)樣品中Mg的量比A1的量多時,S02和NOx的脫除效果明顯比A1元素多的樣品的脫除效果好很多。采用熔鹽法制備的樣品的脫除效率明顯比固相法制備的樣品的脫除效率高。采用固相法合成時,制備溫度對S02的脫除率的影響比對NOx脫除率的影響更大。采用較低制備溫度有利于脫除S02。其中,Mg/Al摩爾比為6：1時的樣品的脫除效果為最好,SO2脫除率最高能達(dá)到99%,NOx脫除率最高能達(dá)到45%,并且經(jīng)過60mmin后脫硫率僅下降3.4%,脫氮率僅下降1.5%。采用熔鹽法合成時Mg/Al摩爾比為4：1的樣品的脫除效果為最好,S02脫除率最高能達(dá)到100%,NOx脫除率最高能達(dá)到71%,脫硫率和脫硝率在高效區(qū)間能維持150min,其脫除率所處的系統(tǒng)高效區(qū)間是固相法的2.5倍之多。利用吸附動力學(xué)方程對整個吸附過程進(jìn)行擬合。結(jié)果表明整個吸附過程主要受吸附質(zhì)分子與吸附劑分子的反應(yīng)過程控制,而吸附質(zhì)分子擴(kuò)散到吸附劑分子的表面以及在吸附劑內(nèi)部的擴(kuò)散過程不是整個過程速率的決定性因素。
[Abstract]:In China, sulfur dioxide and nitrogen oxides in the atmosphere mainly come from coal-fired power plants. Controlling the emission of gas pollutants from coal-fired power plants is a necessary condition for the sustainable development of the whole power industry and even the national economy. Using desulphurization process and denitrification process alone occupies a large area and has high investment cost. It is a hot spot to research and develop a simultaneous desulphurization and denitrification process. Mg-Al oxide has rich sources and low cost. As an absorbent, it has been widely used and has great potential in simultaneous desulfurization and denitrification. Reducing particle size is a breakthrough point to improve the desulphurization and denitrification efficiency of Mg-Al oxide. In this paper, Mg-Al composite oxides with different Mg/Al molar ratios were prepared by solid phase method and molten salt method, and the simultaneous desulfurization and denitrification experiments were carried out in a wet reactor. It is found that when the amount of Mg in the sample is more than that of A1, the removal effect of S02 and NOx is much better than that of the sample with more A1 elements. The removal efficiency of the samples prepared by molten salt method is obviously higher than that of the samples prepared by solid phase method. When synthesized by solid phase method, the effect of preparation temperature on the removal rate of S02 is greater than that of NOx. The lower preparation temperature is beneficial to the removal of S02. Among them, when the molar ratio of Mg/Al is 6: 1, the removal rate of SO2 is the best, the highest removal rate of NOx is 99%, the highest removal rate of SO2 is 45%, and the desulphurization rate decreases only 3.4% after 60mmin. The denitrification rate decreased by only 1.5%. When the molar ratio of Mg/Al is 4:1, the removal effect of S02 is the best, the highest removal rate of S02 is 100%, the highest removal rate of S02 is 71%, and the desulphurization rate and denitrification rate can be maintained in the high efficiency range. The removal rate of the system is 2.5 times higher than that of the solid phase method. The adsorption kinetics equation was used to fit the whole adsorption process. The results show that the whole adsorption process is mainly controlled by the reaction process between the adsorbents and the adsorbents, but the diffusion of the adsorbents to the surface of the adsorbents and the diffusion process within the adsorbents is not the decisive factor of the rate of the whole process.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：X773

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本文編號：2496673