共查询到18条相似文献,搜索用时 500 毫秒
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基于甲醇和碳酸二甲酯体系的共沸特性,应用双效热集成和分割式热泵两种双塔精馏工艺进行该体系的分离研究。利用文献报道的实验数据对选用的Wilson物性方程中的二元交互作用参数进行回归修正。利用Aspen Plus模拟软件,以年运行总费用最小为目标函数,分别对提出的两种双塔精馏工艺进行模拟与优化,得到合适的工艺参数。模拟结果表明,两种双塔精馏工艺均比单塔加压精馏工艺其能耗更低、年运行总费用更少。就两种双塔精馏工艺而言,分割式热泵精馏工艺较双效热集成精馏工艺,可节约设备投资费用约2.69%,年运行总费用节约17.33%。 相似文献
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常规精馏分离乙醇-异丙醇小温差体系的能耗较高,为此本文将两种机械蒸汽再压缩(MVR)热泵精馏工艺,即塔顶蒸汽直接压缩供热和塔底液相闪蒸压缩供热精馏工艺应用于乙醇-异丙醇的分离研究。利用Aspen Plus化工流程模拟软件中的严格精馏模块RadFrac.和压缩机模块Compr.,选用Wilson-RK方程计算物性数据,以分离过程的能耗最低为目标函数,对以上提出的两种MVR热泵精馏工艺分别在不同操作压力工况条件下进行了模拟与优化,得到了各自相关的工艺参数和设备参数。研究结果表明:与常规精馏工艺相比,以上两种MVR热泵精馏工艺节能分别为93.2%和93.4%。利用模拟得到的相关数据,估算了以上两种MVR热泵精馏工艺的平均年总费用,并进行了综合经济效益评价。结果表明:以上两种MVR热泵精馏工艺的平均年总费用基本持平,因此以上两种MVR热泵精馏工艺均是分离该体系较为合适的方法。 相似文献
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常规机械蒸气再压缩(MVR)热泵精馏分离混合二甲苯工艺,存在压缩机电耗较大及塔顶压缩蒸气的显热未被利用等问题。有机朗肯循环(ORC)发电技术则可以将低温余热转化为电能以供压缩机使用,由此提出了ORC发电技术耦合MVR热泵和带乏汽回热循环(EGC)的ORC发电技术耦合MVR热泵两种精馏工艺应用于本体系的分离研究。以年总费用(TAC)和能耗为分离工艺的评价指标,系统净输出功和循环热效率作为ORC系统的评价指标,对以上两种耦合精馏工艺进行模拟与优化,并与常规MVR热泵精馏工艺进行比较与分析。研究结果表明,ORC发电技术耦合MVR热泵精馏工艺和带EGC的ORC发电技术耦合MVR热泵精馏工艺较常规MVR热泵精馏工艺均具有一定的节能和经济优势,可分别减少能耗9.64%和9.89%,节省TAC 3.19%和3.50%。 相似文献
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乙烯精馏塔的目的是分离碳二馏分,得到合格的产品乙烯。由于乙烯、乙烷的相对挥发度比较小,塔的回流比较大,并且需要依靠压缩机制冷分离,故乙烯精馏塔是乙烯装置的能耗大户。据有关资料测算,其冷量消耗约占整个冷分离系统的40%。目前国内流行的乙烯精馏采用高压常规精馏、低压开式热泵两种方式。针对设计工艺流程、设备材质、塔板数、能量功耗等方面,对两种乙烯精馏方法进行探讨和比较。武汉80万吨乙烯采用前脱丙烷前加氢工艺,低压开式热泵精馏塔符合工艺需要,且相对高压精馏,能耗降低。 相似文献
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乙醇胺吸收CO2过程用能分析及节能途径探讨 总被引:1,自引:0,他引:1
乙醇胺(MEA)吸收CO2技术应用较广,但解吸能耗较大。为了降低解吸过程的能耗,从解吸节能技术出发,提出双效解吸和侧线采出这两种节能方法,并用ASPEN PLUS软件进行模拟,对3种流程进行用能分析,结果表明,这两种方法都比传统流程节能。 相似文献
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利用Aspen Plus流程模拟软件,选用NRTL-RK物性模型和精馏模型格及压缩机模块对粗甘油脱水过程进行了模拟计算,分别计算了塔顶汽相出料直接压缩热泵精馏、塔底产物闪蒸压缩热泵精馏以及常规精馏,结果表明:对于粗甘油脱水提出过程来说,在相同的原料处理量、产品质量、操作压力及回流比、产品纯度(≥99%)时,两种热泵精馏工艺均比常规精馏工艺的能耗有所降低,分别节能56.5%和54.5%,总能耗(标油/吨产品)比常规精馏工艺分别节能58.75%和56.67%,具有十分显著的节能效果。 相似文献
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There is a constant concentration zone for acetone-water mixtures, and the average relative volatility of the two components in the constant concentration zone is only 1.41, so the energy consumption of the conventional distillation process is high. Two kinds of split mechanical vapor recompression (MVR) heat pump distillation processes, i.e., single-stage and two-stage compression processes, were proposed to separate acetone-water mixtures. The thermodynamic data of the mixture were calculated and modules of Aspen Plus were used to simulate the distillation column and steam compressor. Taking the minimum total annual cost as the objective function, the conventional MVR and the two split MVR heat pump distillation processes were simulated and optimized. Compared with the conventional process, the MVR heat pump distillation process had greater economic advantages, and the split heat pump distillation (SHPD) with two-stage compression was superior to the other MVR heat pump distillation processes. 相似文献
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Sung Young Kim Dong Min Kim Bomsock Lee 《Korean Journal of Chemical Engineering》2017,34(5):1310-1318
The objective of this study was to find process simulations of the plant-wide scale lactic acid recovery process using thermally coupled distillation columns to mitigate the remixing effect. The remixing effect has been widely discussed because in a conventional column arrangement it induces a need for a significant amount of energy for repurification in lactic acid recovery processes. One way to overcome high energy consumption is by using thermally coupled distillation columns. This paper suggests and compares two types of thermally coupled distillation columns applied to the plant-wide scale lactic acid recovery process for removing the remixing effect considering a heavy organic impurity and lactic acid oligomerization in the process. The equilibrium stage model based on the RADFRAC module of Aspen Plus was employed for simulating the thermally coupled distillation columns. Simulation results showed that thermally coupled distillation columns can eliminate the remixing effect and reduce energy consumption compared to conventional lactic acid recovery processes. 相似文献
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Ao Yang Yang Su Tao Shi Jingzheng Ren Weifeng Shen Teng Zhou 《Frontiers of Chemical Science and Engineering》2022,16(2):303
An energy-efficient triple-column extractive distillation process is developed for recovering tetrahydrofuran and ethyl acetate from industrial effluent.The process development follows a rigorous hierarchical design procedure that involves entrainer design,thermodynamic analysis,process design and optimization,and heat integration.The computer-aided molecular design method is firstly used to find promising entrainer candidates and the best one is determined via rigorous thermodynamic analysis.Subsequently,the direct and indirect triple-column extractive distillation processes are proposed in the conceptual design step.These two extractive distillation processes are then optimized by employing an improved genetic algorithm.Finally,heat integration is performed to further reduce the process energy consumption.The results indicate that the indirect extractive distillation process with heat integration shows the highest performance in terms of the process economics. 相似文献