其工藝技術(shù)有如下特點(diǎn)。
The process technology has the following characteristics.
1、選擇高質(zhì)量脫硫催化劑至關(guān)重要：在濕式氧化法脫硫中，將H2S氧化成單質(zhì)硫是借助于脫硫液中的載氧體催化劑來(lái)實(shí)現(xiàn)的。催化劑在很大程度上決定著濕式氧化法的脫硫效率，單質(zhì)硫生產(chǎn)率、堿耗、再生效率，副反應(yīng)產(chǎn)率等一系列重要指標(biāo)。因此，選擇一種高性能催化劑作為氧化還原劑，就成為決定這種工藝操作的關(guān)鍵。
1. It is very important to select high-quality desulfurization catalyst: in wet oxidation desulfurization, the oxidation of H2S to elemental sulfur is realized by means of oxygen carrier catalyst in desulfurization liquid. The catalyst largely determines the desulfurization efficiency of wet oxidation method, a series of important indexes such as elemental sulfur productivity, alkali consumption, regeneration efficiency and side reaction yield. Therefore, choosing a high-performance catalyst as redox agent has become the key to this process operation.
2、不管采用何種催化劑，其化學(xué)反應(yīng)過程的共同特點(diǎn)是要分三步走：一步用氨水或純堿液吸收氣體中的H2S進(jìn)行中和反應(yīng)。二步采用載氧體催化劑進(jìn)行催化氧化反應(yīng)把HS-、S-2氧化成單質(zhì)硫。第三步加入或噴射自吸空氣氧化失活的催化劑，使其得到再生，循環(huán)使用。同時(shí)將單質(zhì)硫浮選出來(lái)分離出去，熔煉硫磺。而且從工藝上看，一步吸收反應(yīng)肯定在脫硫塔中進(jìn)行。氣液兩相逆流接觸，通過傳質(zhì)(填料)H2S從氣相介面向液相介面轉(zhuǎn)移，進(jìn)入液相主體。酸堿中和反應(yīng)，生成相應(yīng)的鹽轉(zhuǎn)化為富液。此過程中受氣膜控制屬擴(kuò)散式吸收。然而催化、氧化、析硫的二步化學(xué)反應(yīng)，也主要在脫硫塔內(nèi)進(jìn)行。因而，也形成了這種復(fù)雜相系共存格局。故此，傳質(zhì)面積、噴淋密度、液氣比、堿度、PH值、催化劑濃度、反應(yīng)溫度等都會(huì)影響吸收的選擇性及析硫再生和氣體凈化度。
2. No matter what kind of catalyst is used, the common feature of its chemical reaction process is that it should be divided into three steps: one step is to absorb H2S in the gas with ammonia or soda solution for neutralization reaction. In the second step, the oxygen carrier catalyst is used for catalytic oxidation reaction to oxidize HS - and S-2 into elemental sulfur. The third step is to add or spray the self-priming air oxidation deactivated catalyst to regenerate and recycle it. At the same time, the elemental sulfur is separated by flotation and melted. Moreover, from the process point of view, the one-step absorption reaction must be carried out in the desulfurization tower. The gas-liquid two-phase countercurrent contact transfers H2S from the gas phase interface to the liquid phase interface through mass transfer (packing) and enters the main body of the liquid phase. The acid-base neutralization reaction generates the corresponding salt and converts it into rich liquid. This process is controlled by the gas film and belongs to diffusion absorption. However, the two-step chemical reactions of catalysis, oxidation and sulfur evolution are also mainly carried out in the desulfurization tower. Therefore, the coexistence pattern of this complex phase system is also formed. Therefore, mass transfer area, spray density, liquid gas ratio, alkalinity, pH value, catalyst concentration and reaction temperature will affect the selectivity of absorption, sulfur evolution regeneration and gas purification.
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