本文選題：分餾塔　切入點(diǎn)：催化頂循環(huán)回流　出處：《中國石油大學(xué)(華東)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：由于加工高酸原油加工量的增大,近年來常減壓、催化、焦化等裝置塔頂循回流系統(tǒng)出現(xiàn)了管壁減薄、泄漏、泵體結(jié)鹽等現(xiàn)象,尤其是催化頂循的腐蝕更為嚴(yán)重,極大地影響了裝置的長周期安全運(yùn)行。因此,本文主要對催化分餾塔頂循環(huán)油品、塔頂冷凝水中腐蝕介質(zhì)及腐蝕產(chǎn)物進(jìn)行分析,探索催化頂循腐蝕的原因,進(jìn)一步篩選/合成適合加工高酸原油的分餾塔頂循緩蝕劑。本文通過對頂循油、塔頂冷凝水中腐蝕介質(zhì)及腐蝕產(chǎn)物的分析得出:催化頂循油中含有一定量的氯離子、硫醇、硫化氫,總硫、堿性氮、酚含量較高;測得其水溶性酸堿pH小于7;GC-MS分析得出,催化頂循油品中存在多種酚類化合物;催化塔頂冷凝水中含有一定量氯離子、硫化物;XRD、XRF分析結(jié)果表明,催化頂循腐蝕產(chǎn)物主要是鐵的硫化物、氧化物等。進(jìn)一步以實(shí)際塔頂循油為腐蝕環(huán)境,考察HCl、H_2S及其油品中存在的含氧、硫、氮的化合物對頂循油腐蝕的影響,綜合分析得出催化頂循油中氯化氫、硫化氫、氨及酚類化合物是造成催化頂循腐蝕嚴(yán)重的主要原因,銨鹽(氯化銨、硫化銨)、二氧化碳等的存在以及頂循溫度較高是造成催化頂循腐蝕的重要因素。本文分別對市售緩蝕劑、自合成的水溶性咪唑啉緩蝕劑和油溶性咪唑啉緩蝕劑進(jìn)行了緩蝕性能評價(jià)。結(jié)果顯示,在HCl-H_2S水體系模擬頂循油環(huán)境中市售緩蝕劑的緩蝕效果MLZYQZ7019;綜合在HCl-水體系及HCl-H_2S水體系模擬頂循油環(huán)境中評價(jià)結(jié)果可看出,自合成油溶性緩蝕劑OBIOCIOAI,優(yōu)于水溶性緩蝕劑。各種緩蝕劑緩蝕率由大到小的順序?yàn)?自合成緩蝕劑OBI油溶性中和緩蝕劑MLZ現(xiàn)場用中和緩蝕劑YQZ7019中和劑EA。以自合成油溶性緩蝕劑OBI緩蝕性能最好,對催化頂循油達(dá)到了很好的緩蝕效果。
[Abstract]:Due to the increase of processing quantity of high-acid crude oil, in recent years, in atmospheric and vacuum pressure, catalysis, coking and other equipment tower top circulation system, such phenomena as tube wall thinning, leakage, salt deposition of pump body and so on, especially the corrosion of catalytic top are more serious. The long period safe operation of the unit is greatly affected. Therefore, this paper mainly analyzes the corrosion medium and corrosion products of the top circulating oil of the catalytic fractionator, the condensing water of the tower and the corrosion products, and probes into the cause of the catalytic top corrosion. The corrosion inhibitor of fractionator for processing high acid crude oil was further screened / synthesized. By analyzing the corrosion media and corrosion products of the top path oil, the corrosion media and corrosion products of the top condensing water were analyzed. The results showed that the catalytic top trace oil contained a certain amount of chlorine ion, mercaptan, and mercaptan. Hydrogen sulphide, total sulfur, basic nitrogen, phenol content are high. The water soluble acid and base pH is less than 7% GC-MS analysis shows that there are many phenolic compounds in catalytic top trace oil, catalytic tower top condensate water contains a certain amount of chlorine ion, The results of XRDX XRF analysis of sulfides show that the main corrosion products are iron sulfides and oxides. Furthermore, the presence of oxygen and sulfur in HClN H2S and its oil is investigated by taking the actual tower top oil as the corrosion environment. Comprehensive analysis shows that hydrogen chloride, hydrogen sulfide, ammonia and phenolic compounds are the main reasons for the severe corrosion of catalytic top route oil, ammonium salt (ammonium chloride, ammonium chloride, ammonium chloride, ammonium chloride, ammonium chloride, ammonium chloride, ammonium chloride, ammonium chloride, ammonium chloride, ammonium chloride, ammonium chloride, ammonium chloride, ammonium chloride, ammonium chloride, ammonium chloride, ammonium chloride). The existence of ammonium sulphide, carbon dioxide and high top temperature are the important factors of catalytic top rate corrosion. The corrosion inhibition properties of water-soluble Imidazoline inhibitor and oil-soluble Imidazoline inhibitor were evaluated. The corrosion inhibition effect of the corrosion inhibitor MLZYQZ7019 in the HCl-H_2S water system is simulated in the top track oil environment, and the results can be seen from the comprehensive evaluation in the HCl-water system and the HCl-H_2S water system in the simulated top track oil environment. The self-synthesized oil soluble inhibitor Obio CIOAI is superior to the water soluble inhibitor. The order of corrosion inhibition rate of various inhibitors is: Self-synthetic inhibitor OBI oil soluble neutralizing inhibitor MLZ neutralizing inhibitor YQZ7019 neutralizer EA. The corrosion inhibition performance of soluble corrosion inhibitor OBI is the best. A good corrosion inhibition effect is achieved on the catalytic top track oil.
【學(xué)位授予單位】：中國石油大學(xué)(華東)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TE986

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