脫硫塔設(shè)計(jì)摘 要:考慮到對(duì)煤種及鍋爐負(fù)荷的適應(yīng)性、運(yùn)行與維修的方便性、吸收劑的廉價(jià)性和來(lái)源廣范性、副產(chǎn)品具有的綜合利用價(jià)值性 (即使拋棄擱置也無(wú)二次污染)，在比較了幾種不同工藝的特性以及它們中國(guó)的實(shí)際應(yīng)用情況之后，本文選擇了順應(yīng)吸收塔發(fā)展潮流的噴淋塔作為設(shè)計(jì)對(duì)象來(lái)實(shí)現(xiàn)石灰石－石膏濕法煙氣脫硫。這套工藝采用了脫硫、除塵和就地強(qiáng)制氧化同時(shí)完成的高性能化組合塔型。設(shè)計(jì)塔內(nèi)煙氣的流速為3 m/s ，液氣比為18 L/m3，鈣硫比為1.04。噴淋塔主體、除霧器和再噴淋層依次垂直布置，這樣塔的整體布局將會(huì)更加緊湊，占地面積較小。對(duì)于脫硫產(chǎn)物石膏,則采取了回收與拋棄兼容的處理方法。塔內(nèi)脫硫工作流程為：經(jīng)釋熱降溫后的煙氣自下而上的進(jìn)入吸收塔的逆流段，與依靠重力降落的高密度循環(huán)噴淋液滴進(jìn)行高效接觸，氣液兩相在空間完成傳質(zhì)和吸收的過(guò)程。然后潔凈的煙氣經(jīng)過(guò)除霧器的除霧和再熱器的加熱后從煙囪中被釋放到大氣當(dāng)中去。吸收漿液在塔下部的氧化槽中被氧化成石膏漿液，然后進(jìn)入石膏濃縮脫水系統(tǒng)。關(guān)鍵詞：濕法煙氣脫硫，脫硫塔，石灰石－石膏法Design of desulfurize towerAbstract:Considering the adaptability to coal type and loads, the convenience of operation and maintenance, the relatively cheap and easy-obtaining absorbent,the comprehensive utilization of by-product (no secondary pollution, even abandoned gypsum), after comparing different technical process features and the application situation in China, the spray scrubber, which is the developing trend of absorption tower, is designed for CaCO3-CaCO4 wet flue gas desulfurization in this paper. The technology uses the high-performance integral spray scrubber, in which the function of desulfurization, dedusting, and forced oxidation on the spot are possessed simultaneously. The designed velocity of flue gas in countercurrent section is 3m/s. The liquid/gas ratio is 18L/m3 and Ca/S ratio is 1.04.Spray tower, mist eliminator, reheater are arranged one on top of another vertically, therefore the tower area layout of it is more compact and the occupied land area is smaller. For the desulfurization products,gypsum, the treatment of part being recovered and part being abandoned was adopt. Working principle of it is that the flue gas flows upwards into the scrubber countercurrent section after heat being released and temperature being lowered, reacts with high-density circulating slurry drops downwards fallen by gravity, gas and slurry two phases finish the process mass transferring and absorption reaction. Then the clean flue gas passed through mist eliminator and reheater, and discharges to the lower oxidation sump, and then enters gypsum concentration and dehydration system.KEY WORDS: wet flue gas desulfurization(WFGD), desulfurize tower, limestone-gypsum technology