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　　在現(xiàn)代制藥工業(yè)的生產(chǎn)過程中，不可避免地要使用大量的化學(xué)與生物制劑，這帶來的一個(gè)結(jié)果是在生產(chǎn)的每個(gè)步驟都會(huì)排放出成分復(fù)雜的尾氣，以揮發(fā)性有機(jī)化合物(VOC)居多。如何處理含VOC的尾氣，成為企業(yè)面臨的一大環(huán)保難題。國內(nèi)目前主要采用熱氧化法的處理方式，即蓄熱式熱力焚化爐(英文名為“Regenerative Thermal Oxidizer”，簡稱為“RTO”)
　　二、RTO工作原理
　　把有機(jī)廢氣加熱到760攝氏度以上，使廢氣中的VOC在氧化分解成二氧化碳和水。廢氣首先通過蓄熱體加熱到接近熱氧化溫度，而后進(jìn)入燃燒室進(jìn)行熱氧化，氧化后的氣體溫度升高，有機(jī)物基本上轉(zhuǎn)化成二氧化碳和水。凈化后的氣體，經(jīng)過另一蓄熱體，溫度下降，達(dá)到排放標(biāo)準(zhǔn)后排放。不同蓄熱體之間通過切換閥，隨時(shí)間進(jìn)行轉(zhuǎn)換，分別進(jìn)行吸熱和放熱。氧化產(chǎn)生的高溫氣體流經(jīng)特制的陶瓷蓄熱體，使陶瓷體升溫而“蓄熱”，此“蓄熱”用于預(yù)熱后續(xù)進(jìn)入的有機(jī)廢氣，從而節(jié)省廢氣升溫的燃料消耗。陶瓷蓄熱體應(yīng)分成兩個(gè)(含兩個(gè))以上的區(qū)或室，每個(gè)蓄熱室依次經(jīng)歷蓄熱-放熱-清掃等程序，周而復(fù)始，連續(xù)工作。蓄熱室“放熱”后應(yīng)立即通過反吹風(fēng)機(jī)對(duì)該蓄熱室進(jìn)行清掃(以保證VOC去除率在95%以上)，只有待清掃完成后才能進(jìn)入“蓄熱”程序。RTO設(shè)備的工作流程見下圖：
　三、控制要求和方法
　　3.1. 燃燒器控制
　　氧化室安裝一個(gè)帶比例調(diào)節(jié)的天然氣燃燒器。燃燒器的供熱量是用氧化室溫度，經(jīng)過PID調(diào)節(jié)器自動(dòng)調(diào)節(jié)，當(dāng)燃燒器運(yùn)行時(shí)，燃燒器PID的SP外給定值(TE05_AM)等于SP外給定值+升溫速率設(shè)定值/120。按照升溫曲線進(jìn)行升溫。否則，SP外給定值等于氧化室溫度。如果SP外給定值超過TE05_S10(氧化室溫度--理想控制溫度設(shè)定)，那么TE05_S10直接賦值給TE05_AM(SP外給定值)，進(jìn)行溫度限制。此外，燃燒系統(tǒng)還帶有熄火保護(hù)、超溫報(bào)警和超溫自動(dòng)停燃燒器等功能。
3.2.進(jìn)氣、出氣、清掃流程的切換
　　該設(shè)備有三個(gè)蓄熱室，一個(gè)公共氧化室，有機(jī)廢氣通過鼓風(fēng)機(jī)送入蓄熱室1，吸熱后進(jìn)入氧化室，蓄熱室1因放熱而降溫，燃燒升溫后的氣體進(jìn)入蓄熱室2，通過熱交換把熱量蓄存在蓄熱室2的陶瓷蓄熱體中，處理后的氣體經(jīng)后續(xù)處理合格后煙囪排空。同時(shí)蓄熱室3空間中殘留未處理的VOC廢氣被反吹風(fēng)機(jī)吹回氧化室焚化處理。經(jīng)過一段時(shí)間(約2分鐘(可設(shè)定))后，氣流改變方向從蓄熱室2進(jìn)入氧化室，通過蓄熱室2吸收熱量升溫后，在氧化室內(nèi)高溫焚化，最后經(jīng)蓄熱室3熱交換后排放，同時(shí)蓄熱室1處于清掃狀態(tài)，經(jīng)過一段時(shí)間(約2分鐘(可設(shè)定))后，氣流再次改變方向，不斷的交替循環(huán)，保證氧化室溫度在800℃以上，以此保證高的去除率和換熱效率。程序如下圖：

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