【摘要】：通過對(duì)甲烷化反應(yīng)系統(tǒng)分析,建立了一個(gè)第一甲烷化反應(yīng)器出口部分循環(huán)的三級(jí)絕熱固定床甲烷化工藝流程。選取一氧化碳甲烷化和水煤氣變換反應(yīng)為獨(dú)立反應(yīng),CH4和CO2為關(guān)鍵組分,建立了絕熱式固定床甲烷化反應(yīng)器的一維擬均相數(shù)學(xué)模型。用Matlab采用Runge-Kutta法求解一維擬均相數(shù)學(xué)模型微分方程組。原料氣流量800kmol/h,各組分摩爾分率CH4-0.0149, CO2-0.1010, CO-0.1290, H2-0.7515, H2O-0.0000, N2-0.0036,循環(huán)比為3.0,第一甲烷化反應(yīng)器進(jìn)口操作壓力為3.0MPa,三級(jí)反應(yīng)器進(jìn)口溫度都為553K時(shí),第一、二、三甲烷化反應(yīng)器出口溫度分別為879K,725K和611K,CO轉(zhuǎn)化率分別為86.48%,99.20%和100%,第三反應(yīng)器出口CH4干基摩爾含量為95.49%。然后以一維擬均相數(shù)學(xué)模型為基礎(chǔ),建立二維擬均相數(shù)學(xué)模型,對(duì)徑向反應(yīng)溫度和濃度分步進(jìn)行初步研究,得到垂直于流動(dòng)方向的溫度差和濃度差很小,可不予考慮�；诩淄榛磻�(yīng)系統(tǒng)數(shù)學(xué)模型,考察了各工藝條件對(duì)反應(yīng)器的影響。結(jié)果表明,原料氣進(jìn)料流量越大甲烷化反應(yīng)位置越往后移；進(jìn)料溫度越高,反應(yīng)器出口溫度越高,CO轉(zhuǎn)化率會(huì)相應(yīng)降低；氫碳比對(duì)甲烷化反應(yīng)影響不大,H/C在2.5-3.5之間都滿足生產(chǎn)需要；H2O的加入會(huì)降低反應(yīng)器出口溫度和CO轉(zhuǎn)化率,可以改變水的加入量調(diào)節(jié)反應(yīng)器出口溫度；操作壓力越大越有利于甲烷化反應(yīng)；循環(huán)比越大,反應(yīng)器的出口溫度明顯降低,CO轉(zhuǎn)化率和CH4干基摩爾含量都增大。用Aspen中轉(zhuǎn)化率反應(yīng)器模擬計(jì)算了一段循環(huán)、二段循環(huán)、三段循環(huán)和原料氣分流二段循環(huán)工藝過程中產(chǎn)生的高壓過熱蒸汽、中壓過熱蒸汽和循環(huán)功耗,得到甲烷化工藝流程中余熱回收最多、經(jīng)濟(jì)性最好的工藝流程是原料氣分流二段循環(huán)工藝。一段循環(huán)副產(chǎn)高壓過熱蒸汽最多。
[Abstract]:A three-stage adiabatic fixed bed methanation process with partial circulation at the outlet of the first methanation reactor was established by systematic analysis of the methanation reaction. The one-dimensional quasi-homogeneous mathematical model of adiabatic fixed-bed methanation reactor was established by selecting carbon monoxide methanation and water gas shift reaction as independent reactions and CH4 and CO2 as key components. Matlab is used to solve the differential equations of one dimensional quasi homogeneous mathematical model by Runge-Kutta method. The flow rate of raw gas is 800 kmol / h, the molar fraction of each component is CH4-0.0149, CO2-0.1010, CO-0.1290, H 2-0.7515, H 2O -0.0000, N 2-0.0036, the cycle ratio is 3.0, When the inlet operating pressure of the first methanation reactor is 3.0 MPA, and the inlet temperature of the tertiary reactor is 553K, the outlet temperature of the first, second and third methanation reactors is 879KN 725K and 611KN CO conversion rate is 86.48, respectively. 99.20% and 100%, the dry mole content of CH4 at the outlet of the third reactor was 95.49. Then, based on the one-dimensional quasi-homogeneous mathematical model, a two-dimensional quasi-homogeneous mathematical model is established. The temperature and concentration of radial reaction are studied step by step. It is found that the temperature difference and concentration difference perpendicular to the flow direction are very small and can not be considered. Based on the mathematical model of methanation reaction system, the effects of various process conditions on the reactor were investigated. The results showed that the methanation reaction position moved backward with the increase of feed gas flow rate, the higher the feed temperature, the higher the reactor outlet temperature, and the lower the CO conversion rate. The ratio of hydrogen to carbon has little effect on the methanation reaction, and H / C can meet the needs of production between 2.5-3.5. The addition of H _ 2O can reduce the reactor outlet temperature and CO conversion, and can change the water addition to adjust the reactor outlet temperature. The higher the operating pressure, the better the methanation reaction, the higher the circulation ratio, the lower the outlet temperature of the reactor, the higher the CO conversion rate and the CH4 dry base molar content. The high pressure superheated steam, medium pressure superheated steam and cycle power consumption produced in the process of one-stage cycle, two-stage cycle, three-stage cycle and two-stage circulation of feed gas were simulated with Aspen conversion reactor. In methanation process, the waste heat recovery is the most, and the best economic process is the two-stage circulation process of feedstock gas. The first cycle produces the most superheated steam at high pressure.
【學(xué)位授予單位】：華東理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TE665.3

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