The trichlorosilane(TCS)purification process consumes a significant amount of energy to achieve the high purity requirement for TCS quality(99.9999%).This work proposed a series of energy saving technology to enhance ...The trichlorosilane(TCS)purification process consumes a significant amount of energy to achieve the high purity requirement for TCS quality(99.9999%).This work proposed a series of energy saving technology to enhance the TCS purification process,including the conventional process,the conventional process coupled with heat-pump(HP),the multi-effect distillation process,and the dividing-wall columns process.All proposed schemes have been conceptually constructed by Aspen Plus.The design and optimization of the processes have been performed by the sensitivity analysis and the response surface methodology.Moreover,the energy consumption and total annual cost(TAC)for these schemes were discussed.The simulation results show that the TAC of the conventional process coupled with the integrated heat pump can reduce 50.5%of energy consumption as compared with the conventional process;the double-effect and three-effect processes can save 15.6%and 33.8%of energy consumption,respectively;the dividing wall column process and that coupled with the heat pump process can reduce by 22.3%and 48.1%of energy consumption,respectively.It can be found that the operating cost can be saved by using the heat pump technology,while the capital cost increases due to the investment in the compressor,when the processes coupled with the heat pump are used.These results demonstrate that the conventional process coupled with the HP technology has advantages over other distillation schemes for TCS purification in terms of the energy saving and economic effects.展开更多
The reactive distillation process for producing high purity monosilane via trichlorosilane redistribution reaction was simulated. Rigorous RadFrac block was employed in Aspen Plus simulation package. Accurate results ...The reactive distillation process for producing high purity monosilane via trichlorosilane redistribution reaction was simulated. Rigorous RadFrac block was employed in Aspen Plus simulation package. Accurate results could be given when the chemical kinetics was taken into account in the equilibrium stage model. A single column process was used for the verification of previous studies. The results showed that 99.9% purity monosilane could be achieved in the reactive distillation. A pumparound block was employed to reduce the condenser duty with inexpen-sive coolant. The effects of operating pressure, feed stage location, liquid holdup per stage and pumparound location were also investigated. The energy consumption was limited, but the refrigerant temperature was too low, which is the fatal disadvantage. Therefore, a double columns process was developed to increase the condenser tem-perature. The simulation results demonstrated that a reasonable temperature could be achieved by varying the recycle stream location.展开更多
为了降低改良西门子法精馏过程的能耗,模拟和优化了尾气回收料精馏过程中脱重-脱轻和脱轻-脱重2种工艺路线,比较了2种工艺路线的综合热负荷。结果表明,脱重-脱轻工艺脱轻塔的总热负荷小于脱轻-脱重工艺的脱轻塔的总热负荷,进料1时小了约...为了降低改良西门子法精馏过程的能耗,模拟和优化了尾气回收料精馏过程中脱重-脱轻和脱轻-脱重2种工艺路线,比较了2种工艺路线的综合热负荷。结果表明,脱重-脱轻工艺脱轻塔的总热负荷小于脱轻-脱重工艺的脱轻塔的总热负荷,进料1时小了约43 k W,进料2时小了约34 k W,进料3时小了14 k W。脱重-脱轻工艺的脱重塔的总热负荷则明显大于脱轻-脱重工艺的脱重塔的总热负荷,进料1时高出约50 k W,进料2时高出约41 k W,进料3时高出约34 k W。对于尾气回收料精馏而言,脱重-脱轻工艺的综合热负荷大于脱轻-脱重工艺的综合热负荷,脱轻-脱重工艺是更好的精馏工艺路线。原因是,相对于脱轻-脱重工艺,脱重-脱轻工艺脱重塔需要处理的物料流量更大,塔顶温度要更低。展开更多
基金financial support from the National Natural Science Foundation of China (project No. 21406157)
文摘The trichlorosilane(TCS)purification process consumes a significant amount of energy to achieve the high purity requirement for TCS quality(99.9999%).This work proposed a series of energy saving technology to enhance the TCS purification process,including the conventional process,the conventional process coupled with heat-pump(HP),the multi-effect distillation process,and the dividing-wall columns process.All proposed schemes have been conceptually constructed by Aspen Plus.The design and optimization of the processes have been performed by the sensitivity analysis and the response surface methodology.Moreover,the energy consumption and total annual cost(TAC)for these schemes were discussed.The simulation results show that the TAC of the conventional process coupled with the integrated heat pump can reduce 50.5%of energy consumption as compared with the conventional process;the double-effect and three-effect processes can save 15.6%and 33.8%of energy consumption,respectively;the dividing wall column process and that coupled with the heat pump process can reduce by 22.3%and 48.1%of energy consumption,respectively.It can be found that the operating cost can be saved by using the heat pump technology,while the capital cost increases due to the investment in the compressor,when the processes coupled with the heat pump are used.These results demonstrate that the conventional process coupled with the HP technology has advantages over other distillation schemes for TCS purification in terms of the energy saving and economic effects.
文摘The reactive distillation process for producing high purity monosilane via trichlorosilane redistribution reaction was simulated. Rigorous RadFrac block was employed in Aspen Plus simulation package. Accurate results could be given when the chemical kinetics was taken into account in the equilibrium stage model. A single column process was used for the verification of previous studies. The results showed that 99.9% purity monosilane could be achieved in the reactive distillation. A pumparound block was employed to reduce the condenser duty with inexpen-sive coolant. The effects of operating pressure, feed stage location, liquid holdup per stage and pumparound location were also investigated. The energy consumption was limited, but the refrigerant temperature was too low, which is the fatal disadvantage. Therefore, a double columns process was developed to increase the condenser tem-perature. The simulation results demonstrated that a reasonable temperature could be achieved by varying the recycle stream location.
文摘为了降低改良西门子法精馏过程的能耗,模拟和优化了尾气回收料精馏过程中脱重-脱轻和脱轻-脱重2种工艺路线,比较了2种工艺路线的综合热负荷。结果表明,脱重-脱轻工艺脱轻塔的总热负荷小于脱轻-脱重工艺的脱轻塔的总热负荷,进料1时小了约43 k W,进料2时小了约34 k W,进料3时小了14 k W。脱重-脱轻工艺的脱重塔的总热负荷则明显大于脱轻-脱重工艺的脱重塔的总热负荷,进料1时高出约50 k W,进料2时高出约41 k W,进料3时高出约34 k W。对于尾气回收料精馏而言,脱重-脱轻工艺的综合热负荷大于脱轻-脱重工艺的综合热负荷,脱轻-脱重工艺是更好的精馏工艺路线。原因是,相对于脱轻-脱重工艺,脱重-脱轻工艺脱重塔需要处理的物料流量更大,塔顶温度要更低。
