A kind of polysilicon crude distillation control method
A control method, polysilicon technology, applied in chemical instruments and methods, halogenated silanes, silicon compounds, etc., can solve the problems of difficulty in overall planning, large control deviation, etc., and achieve the goal of reducing standard deviation, maintaining consistency, and realizing automatic operation. Effect
Active Publication Date: 2019-05-03
XINTE ENERGY
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Problems solved by technology
[0007] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a polysilicon crude distillation control method to solve the problems of large control deviation and difficult overall planning of the influence of each controlled variable
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[0032] The technical solutions in the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. Apparently, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0033] The present invention changes the existing control modes of the first-stage synthetic crude distillation tower and the first-stage synthetic crude distillation tower, and changes conventional control into multivariable predictive control and intelligent control. Specifically, combined with the process simulation technology, through in-depth analysis of the key process indicators and product quality indicators of the polysilicon crude distillation unit, a reasonable process control mo...
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The invention provides a polysilicon coarse distillation control method. A pressure difference between a tower top and bottom and a tower bottom temperature of a synthetic primary distillation tower are adjusted by adjusting a tower bottom production flow rate of the tower bottom of the synthetic primary distillation tower, the tower bottom temperature and a tower bottom liquid level of the synthetic primary distillation tower are adjusted by adjusting a feeding flow rate of the synthetic primary distillation tower, the tower bottom temperature and the tower bottom liquid level of the synthetic primary distillation tower are adjusted by adjusting the production flow rate of the tower bottom of the synthetic primary distillation tower, a relationship between different controlled variables and the same manipulated variable is established, so as to realize association control among the controlled variables, a change of a manipulated variable can cause changes in a plurality of controlled variables, if one or more controlled variables do not meet process requirements, adjusting of manipulated variables is continued, and therefore polysilicon coarse distillation process is controlled in real time, the whole control process has high real-time performance and no lag, the control accuracy is high, the standard deviation of process parameters is reduced, and to smooth operation of the system is ensured.
Description
technical field [0001] The invention relates to the technical field of photovoltaic energy, in particular to a polysilicon crude distillation control method. Background technique [0002] Crude distillation of polysilicon is an important part of the polysilicon production process. It mainly provides refined raw materials for polysilicon, and its product is refined trichlorosilane. The purity of trichlorosilane will determine the quality of polysilicon. In the actual production control process, there are large changes in the feed composition of the rectification tower, uncertainty in the fluctuation of the steam pressure used for heating the reboiler of the rectification tower, and many interference factors during the operation process, including measurable and unmeasurable interference. The parameters fluctuate greatly, the process is constrained, and there are many constraints and restrictions between the control quantity and the controlled quantity. [0003] The polycryst...
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IPC IPC(8): C01B33/107
CPCC01B33/1071
Inventor 俞清华宋永刚陈鹏杜家勇唐杰高攀
Owner XINTE ENERGY