本文選題：低溫甲醇洗 + PSRK方程修正�。� 參考：《青島科技大學(xué)》2015年碩士論文

【摘要】：低溫甲醇洗工藝是一種以低溫甲醇為吸收劑,通過物理吸收凈化合成氣中酸性組分的方法。它利用低溫下CO2、H2S、H2、 CO等氣體在甲醇中的溶解度差異,選擇性脫除酸性氣體,同時回收H2和CO。作為一種高效的氣體凈化工藝,低溫甲醇洗在煤化工、合成氨等行業(yè)有著廣泛應(yīng)用。本文基于Aspen Plus軟件平臺,考察了低溫甲醇洗系統(tǒng)的熱力學(xué)特性,通過對比不同熱力學(xué)方程對該工藝模擬的準(zhǔn)確性,確定了PSRK狀態(tài)方程的熱力學(xué)方法。針對液相密度、氣液兩相粘度以及甲醇飽和蒸汽壓等物性參數(shù)計算偏差較大的問題,通過修正缺省的物性計算路線與內(nèi)置關(guān)聯(lián)式,實(shí)現(xiàn)了合成氣及低溫甲醇多組分體系熱力學(xué)性質(zhì)的準(zhǔn)確表征。在上述基礎(chǔ)上,對國內(nèi)某廠低溫甲醇洗工藝流程進(jìn)行模擬,重點(diǎn)研究了變換氣吸收塔、非變換氣吸收塔、H2S濃縮塔、熱再生塔和甲醇／水分餾塔,模擬結(jié)果與實(shí)際生產(chǎn)數(shù)據(jù)吻合良好,最大偏差為5%,平均偏差在3%以內(nèi)。對主要流股中重要組分的濃度分布情況進(jìn)行了分析,符合各塔實(shí)際情況。為了實(shí)現(xiàn)適應(yīng)市場需求的靈活生產(chǎn)策略,考察了變換氣吸收塔等主要設(shè)備的負(fù)荷能力,對原料氣中硫化物含量、貧甲醇用量、N2用量等操作條件進(jìn)行了靈敏度分析,確定了在滿足控制指標(biāo)條件下,各操作參數(shù)的極限值。對于生產(chǎn)負(fù)荷提升20%的工況,通過水力學(xué)校核和分析,確定了主要塔設(shè)備的制約瓶頸,提出通過改造設(shè)計余量最小的H2S濃縮塔塔板結(jié)構(gòu)來滿足負(fù)荷提升的方案。本文的研究提供了準(zhǔn)確模擬低溫甲醇洗的方法,同時對生產(chǎn)有一定的參考價值與指導(dǎo)作用。
[Abstract]:Low temperature methanol washing process is a method of purifying acid components in syngas by physical absorption with low temperature methanol as absorbent. By using the solubility difference of CO _ 2H _ 2S _ 2H _ 2, CO and so on in methanol at low temperature, the acid gas is selectively removed and H _ 2 and CO _ 2 are recovered at the same time. As an efficient gas purification process, low-temperature methanol washing is widely used in coal chemical industry and ammonia synthesis industry. Based on the Aspen Plus software platform, the thermodynamic characteristics of the low-temperature methanol washing system were investigated. The thermodynamic method of the PSRK equation of state was determined by comparing the accuracy of different thermodynamic equations to the simulation of the process. In order to solve the problem that the calculation deviation of physical property parameters such as liquid density, gas-liquid two-phase viscosity and saturated vapor pressure of methanol is large, by modifying the default physical property calculation route and the built-in correlation formula, The thermodynamic properties of synthesis gas and methanol multicomponent system at low temperature have been accurately characterized. On the basis of the above, the process flow of methanol washing at low temperature in a domestic plant was simulated, with emphasis on the study of a shift gas absorption tower, a non-shift gas absorption tower, a H _ 2S condenser, a thermal regeneration tower and a methanol / water fractionator. The simulation results are in good agreement with the actual production data, the maximum deviation is 5 and the average deviation is less than 3%. The concentration distribution of important components in the main stream is analyzed, which accords with the actual conditions of each tower. In order to realize the flexible production strategy to meet the market demand, the load capacity of the main equipment such as the shift gas absorber was investigated. The sensitivity analysis of the operating conditions, such as the content of sulphide in the feedstock gas and the amount of N _ 2 used for the poor methanol consumption, was carried out. The limit value of each operating parameter is determined under the condition of satisfying the control index. For the working condition where the production load is increased by 20%, the bottleneck of the main tower equipment is determined through hydraulics check and analysis, and the scheme is put forward to meet the load lifting by modifying the H2S concentrator tray structure which has the minimum allowance. The research in this paper provides an accurate simulation method for methanol washing at low temperature, and has certain reference value and guiding function for production at the same time.
【學(xué)位授予單位】：青島科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TQ028.2

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相關(guān)期刊論文 前2條

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本文編號：1849808