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多晶硅冷氢化过程模拟研究
王绪根, 李梦丽, 徐壮, 郭俊恒, 高素芳
PDF(1091 KB)
PDF(1091 KB)
多晶硅冷氢化过程模拟研究
Simulation study on cold hydrogenation process of polysilicon
With the rapid development of new energy and information industry,the importance of polysilicon production has become prominent increasingly. Chinese enterprises mainly produce polysilicon by the improved Siemens method,and silicon tetrachloride ( SiCl4 /STC) is converted into trichlorosilane ( SiHCl3 /TCS) .The STC cold hydrogenation process is an important part,but its research is not enough.STC cold hydrogenation is carried out under the action of cuprous chloride catalyst at 400~ 600 ℃,the high reaction temperature requires consideration of thermodynamic equilibrium,therefore,this article mainly used Aspen Plus chemical simulation software simulates and calculates the thermodynamic and kinetic reaction process of the STC cold hydrogenation process in the polysilicon production process.First,the reaction process was systematically analyzed,four independent reactions and the total reaction of the STC cold hydrogenation reaction were determined,the change of the reaction heat with temperature was analyzed,then the H2 /STC molar ratio,reaction temperature,reaction pressure and other conditions were used to balance the product.The influence of the composition was given,and the appropriate conditions were given.Finally,the kinetic model parameters were input and the heat exchange mode of the plug flow reactor was studied.It was found that the adiabatic reactor had a simple structure,easy to control and more suitable for the STC cold hydrogenation process.an important indicator of ecological security and sustainable utilization of resources,soil quality is of great significance for sustainable development.In order to understand the status of soil heavy metal pollution and ecological risk in the arid zone of central Ningxia,40 soil samples were collected from 5 counties,according to the background value of Ningxia soil,the pollution status of six heavy metals ( Cu,Zn,Pb,Cr,Mn and Ni) in soil was diagnosed,and the pollution degree was analyzed by single factor pollution index method and potential ecological risk index method.The results showed that the coefficient of variation of heavy metal elements in the soil ranged from 26. 10% to 59. 72%,among which the contents of Zn,Pb and Mn were higher than the background value of Ningxia soil; the spatial distribution of heavy metal content in soil is different,showing patchy; the average value of single factor pollution index from large to small was Pb= Zn > Mn > Cr > Cu > Ni,and the soil heavy metals were in mild pollution In addition to Pb,the ecological risk of other heavy metals in the study area is low,and Pb is the main potential ecological risk factor; the RI value of the six heavy metals was 78. 70,and the degree of ecological risk in the study area is slight.In order to promote the development of green and sustainable economy and provide decision-making reference for regional soil quality optimization,heavy metal pollution and ecological risk in the central arid zone of Ningxia were studied.
多晶硅 / 冷氢化 / Aspen Plus / 热力学平衡 {{custom_keyword}} /
polysilicon / cold hydrogenation / Aspen Plus / thermodynamic equilibrium {{custom_keyword}} /
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