本文選題：低品位軟錳礦 + 燒結(jié)煙氣��； 參考：《貴州大學(xué)》2015年碩士論文

【摘要】：針對(duì)我國(guó)鋼鐵行業(yè)SO2氣體排放量大,傳統(tǒng)石灰法、氨-硫銨法、氧化鎂法等濕法脫硫技術(shù)存在運(yùn)行成本較高、設(shè)備腐蝕結(jié)垢、占地面積大、消耗大量水和二次污染等問(wèn)題,論文提出軟錳礦燒結(jié)煙氣干法脫硫工藝。該方法將低品位軟錳礦粉直接接觸高溫?zé)Y(jié)煙氣,利用軟錳礦中二氧化錳(MnO2)的氧化性和燒結(jié)煙氣中二氧化硫(SO2)的還原性發(fā)生氧化還原反應(yīng),在脫除燒結(jié)煙氣中低濃度SO2的同時(shí)得到高附加值的硫酸錳(MnSO4),從熱力學(xué)角度和動(dòng)力學(xué)角度詳細(xì)分析了軟錳礦干法燒結(jié)煙氣脫硫工藝的可行性。主要研究?jī)?nèi)容如下:根據(jù)軟錳礦干法燒結(jié)煙氣脫硫系統(tǒng)中可能發(fā)生的反應(yīng),對(duì)其進(jìn)行熱力學(xué)計(jì)算,并繪制了Mn-S-O系、Fe-S-O系等溫優(yōu)勢(shì)區(qū)相圖。結(jié)果表明:在燒結(jié)煙氣的溫度范圍內(nèi)(120-180℃)脫硫具有很大的反應(yīng)趨勢(shì),反應(yīng)進(jìn)行的很徹底,升高溫度對(duì)脫硫反應(yīng)不利;同時(shí)軟錳礦與SO2反應(yīng)的過(guò)程中對(duì)氧分壓的要求不大,能夠得到MnSO4和Fe2O3共存產(chǎn)物,理論上認(rèn)為低品位軟錳礦可實(shí)現(xiàn)選擇性硫化。采用壓縮空氣和純SO2氣體混合后合成模擬煙氣,在U型玻璃管中進(jìn)行脫硫試驗(yàn),考察了燒結(jié)煙氣溫度、軟錳礦粒度、SO2濃度和氣體流速等因素對(duì)脫硫率的影響。結(jié)果表明:軟錳礦干法脫硫率隨燒結(jié)煙氣溫度的升高而升高、隨軟錳礦目數(shù)的增加而增加、隨進(jìn)氣口SO2濃度的增加而減少、隨混合氣體流速的增加而減少,每組試驗(yàn)達(dá)到70%左右的脫硫率,脫硫后的煙氣可以達(dá)到排放標(biāo)準(zhǔn)。同時(shí)對(duì)軟錳礦干法脫除燒結(jié)煙氣中低含量SO2的動(dòng)力學(xué)進(jìn)行了研究,得出:干法脫硫過(guò)程由外傳質(zhì)和內(nèi)擴(kuò)散控制,與界面化學(xué)反應(yīng)無(wú)關(guān),可由反應(yīng)速率隨溫度的變化試驗(yàn)、表觀活化能及試驗(yàn)數(shù)據(jù)計(jì)算分析得到,同時(shí)可得到軟錳礦干法脫硫的宏觀動(dòng)力學(xué)方程為:其中。本課題的研究有望解決鋼鐵行業(yè)中低濃度含硫燒結(jié)煙氣污染問(wèn)題,同時(shí)最大程度上實(shí)現(xiàn)了低品位軟錳礦的資源化利用,為后續(xù)錳制品的制備奠定了基礎(chǔ),對(duì)含硫燒結(jié)煙氣治理和錳制品行業(yè)的發(fā)展具有重要意義。
[Abstract]:In view of the large amount of so _ 2 emission in iron and steel industry in our country, the problems of traditional lime method, ammonia ammonium sulfate process, magnesium oxide method and so on, such as high operating cost, corrosion and scaling of equipment, large area of land, large consumption of water and secondary pollution, etc. The dry desulfurization process of pyrolusite sintering flue gas is put forward in this paper. In this method, the low-grade pyrolusite powder was directly contacted with the high-temperature sintering flue gas, and the oxidation of manganese dioxide (MNO _ 2) in the pyrolusite and the reduction of sulfur dioxide (so _ 2) in the sinter flue gas were redox. Manganese sulfate (MnSO _ 4) with high added value was obtained by removing so _ 2 from sintering flue gas. The feasibility of dry sintering flue gas desulfurization process with pyrolusite was analyzed in detail from the point of view of thermodynamics and kinetics. The main research contents are as follows: according to the possible reactions in the dry sintering flue gas desulfurization system of pyrolusite, thermodynamic calculation is carried out, and the phase diagram of the isothermal dominant zone of Mn-S-O system is drawn. The results show that desulphurization has a great reaction tendency in the temperature range of 120 ~ 180 鈩，

本文編號(hào)：2101758