A06B-6093-H103 有機廢氣在一定溫度下與氧氣發生反應,生成CO2和H2O,并放出一定熱量的氧化反應過程,RTO是把廢氣加熱到780℃以上,使廢氣中的VOC氧化分解為CO2和H2O,氧化產生的高溫氣體流經陶瓷蓄熱體,使之升溫“蓄熱”,并用來預熱后續進入的有機廢氣,從而節省廢氣升溫燃料消耗的處理技術。該工藝也是國內廢氣治理的主流工藝,但其安全性要求高、并具有高耗能及在某些行業帶來二次污染。
2、直接燃燒工藝
直接燃燒法就是利用燃氣等輔助性材料將廢氣點燃,促使其中的有害物質在高溫燃燒下轉變成無害物質。該方法投資小,操作簡單,適用于濃度高、風量小的廢氣,但其更高耗能及更高的安全技術要求,同時也帶來二次污染問題。
3、吸附工藝
利用活性炭對有機廢氣進行吸附凈化處理,凈化率可達95%以上。該方法設備簡單、前期投資較少,但需要經常更換活性炭,頻繁的裝卸、更換等程序增加運行費用,并且更換的活性炭還是危廢,需要有危廢資質的處理公司進行處理,增加后期運行成本。此外活性炭吸附單一工藝治理有機廢氣很難達標排放,所以國家也明令禁止使用單一活性炭吸附方式治理有機廢氣。
4、吸收工藝
有機廢氣中含易溶于水或酸性及堿性物質多采用物理吸收法,就是將廢氣引入吸收液中進行吸收凈化,如配備水洗、堿洗及酸洗塔等設備。在濃度低、溫度低、風量大的情況下可采取吸收法,但需要配備加熱解析回收裝置,投資額大,也不能單獨做處理工藝使用,必須配合冷凝或焚燒工藝處理。
5、冷凝回收工藝
冷凝法就是將有機廢氣直接引入到冷凝器中,當有機廢氣達到熔點溫度,使其冷凝呈液態,達到回收目的,并使廢氣達到排放標準。當有機廢氣濃度高、風量較小時,可采用冷凝法進行凈化處理,一般應用于醫藥化工、精細化工及石化企業油氣回收。冷凝制冷方式分為機械式制冷及液氮制冷,國內做的比較多的還是壓縮機分段冷凝方式,應用在石化企業油氣回收行業比較多,但其冷凝溫度最大能到零下75℃左右,很難滿足部分熔點更低的有機廢氣的冷凝回收,但其具有高耗電,安全性要求高的缺點。
A06B-6093-H103
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A06B-6093-H103