本文選題：鎂法脫硫 + 亞硫酸鎂��； 參考：《大連海事大學(xué)》2017年碩士論文

【摘要】：與傳統(tǒng)的鈣法脫硫相比,鎂法脫硫具有脫硫效率高,投資少,占地面積小,運行費用低等優(yōu)點。鎂法脫硫副產(chǎn)物-亞硫酸鎂不但會造成脫硫系統(tǒng)腐蝕、磨損和堵塞,而且造成脫硫廢水COD值增大。亞硫酸鎂性質(zhì)不穩(wěn)定,在一定條件下會分解為S02和氧化鎂,對環(huán)境造成二次污染。將亞硫酸鎂強制氧化為穩(wěn)定性強,溶解度大的硫酸鎂成為研究熱點。本文將微孔曝氣技術(shù)應(yīng)用于亞硫酸鎂氧化中,以期推動鎂法脫硫技術(shù)的應(yīng)用推廣。采用微孔曝氣器在不同水深、不同空氣流量的條件下進行清水充氧實驗得到:隨著空氣流量的增大,氧總轉(zhuǎn)移系數(shù)和充氧能力逐漸增大,但增至一定值后變化不大。增加水深可增大氧總轉(zhuǎn)移系數(shù)并且促進充氧能力,并且空氣流量越大,增加水深產(chǎn)生的促進效果越明顯。氧利用率隨水深增大而逐漸增大;隨著空氣流量的增大而線性下降,并且隨水深增大,下降趨勢越顯著。通過研究亞硫酸鎂濃度、曝氣水深、空氣流量、pH值和溫度對亞硫酸鎂氧化反應(yīng)的影響得到:氧化反應(yīng)速率隨濃度增大先升高后下降,在0.1 mol/L左右處達最大;曝氣水深對氧化反應(yīng)影響不大;增大空氣流量有利于提高反應(yīng)速率;氧化反應(yīng)應(yīng)在低pH值下進行;提高反應(yīng)溫度可加快氧化反應(yīng)速率,最佳反應(yīng)溫度為50℃。通過正交試驗得到曝氣水深為1.05 m,氧化100 L亞硫酸鎂溶液的最佳反應(yīng)條件為:亞硫酸鎂濃度0.15mol/L,空氣流量1.5m3/h,pH值7.0-7.5。
[Abstract]:Compared with the traditional calcium desulphurization, magnesium desulphurization has the advantages of high desulfurization efficiency, less investment, small occupation area and low operating cost. Magnesium sulfite, the by-product of magnesium desulfurization, will not only cause corrosion, abrasion and blockage of desulphurization system, but also increase the COD value of desulphurization wastewater. Magnesium sulfite is unstable and decomposes into S02 and MgO under certain conditions, which causes secondary pollution to the environment. The forced oxidation of magnesium sulfite to magnesium sulfate with strong stability and high solubility has become a research hotspot. In this paper, microporous aeration technology is applied to magnesium sulfite oxidation in order to promote the application of magnesium desulphurization technology. The oxygen transfer coefficient and oxygen capacity of microporous aerator were increased with the increase of air flow rate under different water depth and different air flow rate. However, the oxygen transfer coefficient and oxygen capacity increased gradually with the increase of air flow rate, but little change was found after increasing to a certain value. The increase of water depth can increase the total oxygen transfer coefficient and promote the oxygenation capacity, and the greater the air flow rate, the more obvious the effect of increasing the water depth. The oxygen utilization ratio increases gradually with the increase of water depth, and decreases linearly with the increase of air flow rate, and with the increase of water depth, the decreasing trend is more obvious. The effects of magnesium sulfite concentration, water depth of aeration, air flow rate, pH value and temperature on the oxidation reaction of magnesium sulfite were studied. The results showed that the oxidation rate increased first and then decreased with the increase of concentration, and reached the maximum at 0.1 mol / L; The water depth of aeration has little effect on the oxidation reaction; the increase of air flow rate is beneficial to increase the reaction rate; the oxidation reaction should be carried out at low pH value; the reaction rate can be accelerated by increasing the reaction temperature, and the optimum reaction temperature is 50 鈩，

本文編號：2023680