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LYSY法生物脫硫工藝本質(zhì)上屬于氧化還原法類型綠源環(huán)保

1) LYSY法生物脫硫工藝本質(zhì)上屬于氧化還原法類型綠源環(huán)保。后者是氣體凈化工藝中除醇胺法外最重要的一類脫硫工藝,除天然氣工業(yè)外,在煉油、化工、化肥、生物能源等工業(yè)也有廣泛應(yīng)用。其特點(diǎn)是脫硫過(guò)程中同時(shí)生成硫黃,且具有比醇胺法工藝更高的 H2S 凈化度,通常很容易達(dá)到 6 mg /m3的民用天然氣標(biāo)準(zhǔn)。

1) The LYSY biological desulfurization process essentially belongs to the green source environmental protection type of oxidation-reduction method. The latter is the most important type of desulfurization process in gas purification processes, apart from the alcohol amine method. In addition to the natural gas industry, it is also widely used in industries such as refining, chemical, fertilizer, and bioenergy. Its characteristic is the simultaneous generation of sulfur during the desulfurization process, and it has a higher H2S purification degree than the alcohol amine process, usually easily reaching the civilian natural gas standard of 6 mg/m3.

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2) 從技術(shù)經(jīng)濟(jì)角度分析,脫硫工藝選擇除了與操作壓力、CO2/H2S 比、重?zé)N及有機(jī)硫含量等因素有關(guān)外,也與原料氣中潛硫含量以及是否要求回收硫黃這兩個(gè)因素密切有關(guān)。1990 年代,美國(guó)氣體工藝研究院( GTI) 資助的一項(xiàng)專題研究表明,與常用的 Stretford 法和 Lo-Cat 法工藝相比,以 S-P 法為代表的生物脫硫工藝的主要特點(diǎn)是基本上不存在溶液發(fā)泡及設(shè)備堵塞問(wèn)題。

2) From a technical and economic perspective, the selection of desulfurization processes is not only related to factors such as operating pressure, CO2/H2S ratio, heavy hydrocarbons, and organic sulfur content, but also closely related to the potential sulfur content in the feed gas and whether sulfur recovery is required. In the 1990s, a special study funded by the Gas Technology Institute (GTI) in the United States showed that the main feature of the biological desulfurization process represented by the S-P method compared to the commonly used Stretford and Lo Cat methods was that there were basically no problems of solution foaming and equipment blockage.

3) 當(dāng)前已工業(yè)化的氧化還原法中硫容最高的是LYSY絡(luò)合鐵法,但其設(shè)計(jì)硫容一般不超過(guò) 0. 3 kg /m3。同樣屬于氧化還原法類型的 SulFerox 法工藝,將絡(luò)合鐵溶液中鐵離子質(zhì)量濃度提高至 4%,但并不能明顯改善硫容。對(duì)生物脫硫工藝而言,提高硫容的“瓶頸”在于其相對(duì)較緩慢的再生速率。氣升式反應(yīng)器的實(shí)驗(yàn)室研究表明,其處理 H2S 的最高負(fù)荷為 0. 246 kg /m3·h; 同時(shí),即使在設(shè)計(jì)硫容低于 0. 2 kg /m3的條件下運(yùn)行,再生時(shí)副產(chǎn)硫酸鹽的質(zhì)量濃度仍可能高達(dá) 5

3) The LYSY complex iron method currently has the highest sulfur capacity among industrialized oxidation-reduction methods, but its designed sulfur capacity generally does not exceed 0 3 kg/m3. The SulFerox process, which also belongs to the oxidation-reduction method, increases the mass concentration of iron ions in the chelated iron solution to 4%, but does not significantly improve the sulfur capacity. For biological desulfurization processes, the bottleneck in increasing sulfur capacity lies in their relatively slow regeneration rate. Laboratory studies on air lift reactors have shown that their maximum load for treating H2S is 0 246 kg /m3·h;  Meanwhile, even when the designed sulfur capacity is below 0 Under the condition of 2 kg/m3 operation, the mass concentration of by-product sulfate during regeneration may still be as high as 5

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