本文選題：超重力 + 濕法除塵��； 參考：《中北大學(xué)》2015年碩士論文

【摘要】：隨著化石燃料的燃燒和工業(yè)尾氣的大量排放，含塵廢氣給大氣環(huán)境造成了很大的負(fù)擔(dān)，所排放粉塵中的細(xì)顆粒物急劇增多，導(dǎo)致近年來“霧霾”現(xiàn)象頻發(fā)。因此，開發(fā)新型的高效除塵設(shè)備成為關(guān)鍵。超重力濕法除塵技術(shù)具有除塵效率高、能耗低的優(yōu)點而備受關(guān)注，但目前研究和應(yīng)用的多為逆流結(jié)構(gòu)的旋轉(zhuǎn)填料床，可能存在氣速受限、氣體阻力大等問題�；诖耍疚姆謩e對錯流和逆流旋轉(zhuǎn)填料床的除塵效率和壓降進(jìn)行了研究和對比。同時，將潤濕劑與超重力濕法除塵技術(shù)耦合，旨在進(jìn)一步提高旋轉(zhuǎn)填料床的除塵效率。 采用平均粒徑為2.25μm的粉煤灰模擬含塵氣體，通過對超重力濕法除塵的各種因素——含塵氣體濃度、超重力因子、液體噴淋密度、氣速對除塵效率影響的研究，確定了適宜的操作參數(shù)，在此條件下，錯流床和逆流床的總除塵效率分別為99.6%和99.8%。錯流床和逆流床對2.5μm粉塵的分級效率2.5分別可以達(dá)到94.3%和96.1%，對1.0μm粉塵的分級效率1.0分別為79.4%和85.3%。 對錯流與逆流旋轉(zhuǎn)填料床在除塵過程中氣相壓降的研究表明，錯流床和逆流床的氣相壓降都隨著超重力因子和氣速的增大而增大，且逆流床趨勢更明顯，但液體噴淋密度對壓降的影響不大。在同樣的操作參數(shù)下，錯流床與逆流床除塵效率相當(dāng)，，但氣相壓降僅為后者的51%，氣相輸送阻力小。 通過潤濕劑溶液的表面張力變化和對粉塵的浸潤速度兩個實驗，初步篩選出4種潤濕劑與旋轉(zhuǎn)填料床耦合。結(jié)果表明，十二烷基苯磺酸鈉效果最好，以質(zhì)量濃度為0.03%的潤濕劑為除塵劑，適宜的超重力因子從80降低至58.7，減小了26.6%，液體噴淋密度不變。在相同的實驗條件下，總除塵效率提高了1%，PM2.5的分級效率提高了3.43%，PM1.0的分級效率提高了8.44%。 綜上所述，錯流旋轉(zhuǎn)填料床的除塵效率高，壓降低，更適用于處理大氣量的含塵氣體。添加潤濕劑有助于提高旋轉(zhuǎn)填料床對微米級顆粒物的脫除效率，同時降低能耗，為超重力濕法除塵的工業(yè)化推廣提供理論依據(jù)和實踐基礎(chǔ)。
[Abstract]:With the combustion of fossil fuels and the emission of industrial tail gas, the dust waste gas has caused a great burden to the atmospheric environment, and the fine particles in the emitted dust have increased sharply, resulting in the frequent occurrence of "haze" phenomenon in recent years. Therefore, the development of a new type of high-efficiency dust removal equipment has become the key. High gravity wet dust removal technology has attracted much attention due to its advantages of high dust removal efficiency and low energy consumption. However, the current research and application of rotating packed bed with countercurrent structure may have some problems such as limited gas velocity and large gas resistance. Based on this, the dust removal efficiency and pressure drop of cross flow and countercurrent rotating packed bed are studied and compared in this paper. At the same time, the wetting agent is coupled with the high gravity wet dedusting technology in order to further improve the dust removal efficiency of rotating packed bed. The dust containing gas was simulated by fly ash with average particle size of 2.25 渭 m. The effects of various factors such as concentration of dust-bearing gas, high gravity factor, liquid spray density and gas velocity on the dust removal efficiency were studied. Under these conditions, the total dedusting efficiency of cross-flow bed and countercurrent bed is 99.6% and 99.8%, respectively. The classification efficiency of cross-flow bed and countercurrent bed for 2.5 渭 m dust can reach 94.3% and 96.1%, respectively, and 1.0 for 1.0 渭 m dust is 79.4% and 85.3%, respectively. The gas phase pressure drop of cross flow and countercurrent rotating packed bed in the process of dust removal shows that the gas phase pressure drop of cross flow bed and counter flow bed increases with the increase of high gravity factor and gas velocity, and the trend of counter flow bed is more obvious. But the liquid spray density has little effect on the pressure drop. Under the same operating parameters, the efficiency of cross-flow bed and countercurrent bed is equivalent, but the gas pressure drop is only 51% of the latter, and the gas phase transport resistance is small. Through two experiments, the surface tension change of wetting agent solution and the soaking speed of dust, four wetting agents were preliminarily selected for coupling with rotating packed bed. The results showed that sodium dodecylbenzene sulfonate had the best effect. With the wetting agent of 0.03% mass concentration as dust remover, the suitable hypergravity factor was reduced from 80 to 58.7, and the liquid spray density was unchanged. Under the same experimental conditions, the total dust removal efficiency increased the classification efficiency of 1% PM2.5 and the classification efficiency of 3.43% PM1.0 increased 8.4444%. To sum up, cross-flow rotating packed bed has high dust removal efficiency and lower pressure, which is more suitable for dealing with dust-containing gas with large amount of gas. The addition of wetting agent can improve the removal efficiency of micron particles in rotating packed bed and reduce the energy consumption. It provides a theoretical basis and practical basis for the industrialization and popularization of wet dust removal by hypergravity method.
【學(xué)位授予單位】：中北大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：X701.2;TQ028.23

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