本文選題：合成氣 + 二甲醚合成��； 參考：《華東理工大學(xué)》2011年碩士論文

【摘要】：對煤基合成氣一步法制二甲醚反應(yīng)體系的平衡轉(zhuǎn)化率及甲醇合成反應(yīng)與甲醇脫水反應(yīng)的協(xié)同效應(yīng)進(jìn)行了研究。建立了合成氣一步法制二甲醚管殼式固定床反應(yīng)器的二維擬均相數(shù)學(xué)模型,模擬設(shè)計了年產(chǎn)20萬噸二甲醚、副產(chǎn)5萬噸甲醇的反應(yīng)器。采用Aspen Plus流程模擬軟件對合成氣一步法制二甲醚合成系統(tǒng)進(jìn)行模擬。 在3.0～8.0MPa范圍內(nèi),總碳(CO+CO2)的平衡轉(zhuǎn)化率隨著溫度升高而降低,隨著壓力的升高而增大。甲醇脫水反應(yīng)與甲醇合成反應(yīng)的協(xié)同作用能提高總碳的單程轉(zhuǎn)化率。 建立了管殼式固定床反應(yīng)器的二維模型,采用有限差分和龍格庫塔相結(jié)合的方法(MOL法)求解。模擬計算結(jié)果顯示,當(dāng)反應(yīng)管徑為φ42×2mm時,標(biāo)況下反應(yīng)器床層最大徑向溫度差為4.1℃,組分最大摩爾分率差為0.88%；熱點溫度為262.76℃,熱點位置在離反應(yīng)器進(jìn)口2.1m處�？偺紗纬剔D(zhuǎn)化率50.68%,二甲醚選擇性87.41%,甲醇選擇性12.59%。反應(yīng)管直徑、入塔氣量、沸騰水溫度、原料氣CO含量對床層溫度分布、總碳單程轉(zhuǎn)化率、甲醇及二甲醚選擇性都有較大影響。 對年產(chǎn)20萬噸二甲醚,副產(chǎn)5萬噸甲醇的標(biāo)準(zhǔn)工況進(jìn)行模擬計算,確定循環(huán)比為2.78,入塔氣氫碳比為4.86,全塔壓降為0.3MPa,每生產(chǎn)一噸二甲醚消耗4862.6Nm3新鮮合成氣,副產(chǎn)1.92噸中壓蒸汽,副產(chǎn)0.3噸粗甲醇,消耗循環(huán)壓縮功55kw。同時,反應(yīng)器能在50%生產(chǎn)負(fù)荷和110%生產(chǎn)負(fù)荷下平穩(wěn)運行。
[Abstract]:The equilibrium conversion and synergistic effect between methanol synthesis and methanol dehydration were studied in the system of one-step synthesis of dimethyl ether from coal-based syngas. A two-dimensional quasi-homogeneous mathematical model for the synthesis gas one-step dimethyl ether tube and shell fixed-bed reactor was established. The reactor with an annual output of 200000 tons of dimethyl ether and a by-product of 50,000 tons of methanol was simulated and designed. The synthesis system of Dimethyl ether from syngas was simulated by Aspen Plus process simulation software. In the range of 3.0 ~ 8.0 MPA, the equilibrium conversion of total carbon (CO _ 2) decreases with the increase of temperature and increases with the increase of pressure. The synergistic effect of methanol dehydration and methanol synthesis can improve the one-pass conversion of total carbon. A two-dimensional model of a tube-shell fixed-bed reactor was established and solved by the combination of finite difference method and Runge-Kutta method (MOL method). The simulation results show that when the diameter of reactor is 蠁 42 脳 2mm, the maximum radial temperature difference of reactor bed is 4.1 鈩，

本文編號：2057463