本文關(guān)鍵詞： 氨水 同時(shí)脫除 CO_2 SO_2 模擬 MEA　出處：《華北電力大學(xué)》2015年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：氨水作為一種凈化燃煤煙氣的化學(xué)吸收劑,優(yōu)勢(shì)在于其高吸收能力、低再生能耗及可實(shí)現(xiàn)多元污染物的脫除。本文利用較低濃度的氨水同時(shí)脫除燃煤煙氣中的CO_2和SO_2,從影響因素、模型建立及與MEA同時(shí)脫碳脫硫?qū)嶒?yàn)對(duì)比分析三個(gè)方面進(jìn)行了研究。本文通過(guò)在填料塔內(nèi)噴淋氨水溶液進(jìn)行同時(shí)脫碳脫硫的研究,結(jié)果顯示,氨水濃度、液氣比增大,初始CO_2濃度降低,均會(huì)增大脫碳率;pH值越小,脫碳效果越差,但在10.2附近出現(xiàn)波動(dòng);在15℃~60℃范圍內(nèi),35℃時(shí)脫碳率最高。脫硫率受以上因素影響很小,均在99%以上,但SO_2濃度的增加會(huì)降低脫碳率。連續(xù)循環(huán)運(yùn)行實(shí)驗(yàn)中,通過(guò)對(duì)比可知補(bǔ)氨實(shí)驗(yàn)可以很好延長(zhǎng)高效脫除時(shí)間。填料塔出口處氣溶膠濃度會(huì)隨氨水濃度、反應(yīng)溫度、溶液pH值和液氣比的增加而上升。采用Aspen Plus軟件對(duì)實(shí)驗(yàn)過(guò)程進(jìn)行建模,并利用實(shí)驗(yàn)結(jié)果與模擬結(jié)果進(jìn)行比對(duì),二者吻合良好。利用所建模型對(duì)氨水脫硫脫碳后富液中的成分進(jìn)行了分析,預(yù)測(cè)主要的脫硫脫碳產(chǎn)物為NH4HCO3和(NH4)2SO3。在MEA與氨水實(shí)驗(yàn)對(duì)比研究方面,自制鼓泡床吸收實(shí)驗(yàn)表明氨水的吸收能力強(qiáng)于MEA。在更接近實(shí)際的填料塔上研究各因素的影響,氨水溶液可以以較低的濃度對(duì)不同SO_2濃度和CO_2濃度實(shí)現(xiàn)高效率脫除,液汽比的增大均可以增加兩種吸收劑的脫除效率。二者最佳反應(yīng)溫度分別為35℃和45℃。pH的下降引起MEA的脫碳脫硫效率降低更加明顯。改進(jìn)氨法初步實(shí)驗(yàn)發(fā)現(xiàn),向氨水溶液的中添加少量MEA可以明顯的增加吸收劑的脫除能力,并加快反應(yīng)速率。
[Abstract]:Ammonia water as a chemical absorbent for purifying coal-fired flue gas has the advantage of its high absorption capacity. In this paper, the low concentration ammonia water is used to simultaneously remove CO_2 and so _ 2 from coal-fired flue gas. The model was established and compared with MEA simultaneous decarbonization and desulphurization experiments. In this paper, the simultaneous decarbonization and desulfurization of ammonia solution was carried out in the packed tower. The results showed that the concentration of ammonia water and the ratio of liquid to gas increased. The lower the initial CO_2 concentration, the lower the decarburization rate and pH value, the lower the decarburization efficiency, but the lower the decarburization efficiency, the lower the decarbonization efficiency, the higher the decarbonization rate is at 35 鈩，

本文編號(hào)：1502635