Product quality on-line soft-measuring method for industrial fluidized bed gas-phase polythene apparatus

Abstract

The invention discloses a soft measuring method of product quality of an industrial fluidized bed gas-phase polyethylene device. The method comprises the following steps: selecting a plurality of key variables influencing product quality to set up a process detection variable set; applying the projection principle of multivariate statistics to establish a soft measuring model between product resin melt index and density and process detection variables; adopting a nonlinear partial least square method of embedded Taylor series approximation (used for carrying out process nonlinear characteristic representation) as core technology; and determining the number of optimal pivot elements through cross check technology. The soft measuring method avoids complex process mechanism analysis and has convenient site implementation and high precision of soft measuring; therefore, the method is particularly suitable for nonlinear industrial occasions with high dimension and abundant progress data similar to the industrial fluidized bed gas-phase polyethylene production device. Moreover, the soft measuring method can be used for real-time monitoring or production guidance to improve product quality, increase output and ensure smooth device operation, thereby bringing greater economic benefits.

Description

technical field [0001] The invention relates to the detection and control field of petrochemical industrial production process, in particular to an online soft measurement method for product quality of an industrial fluidized bed gas phase polyethylene device. Background technique [0002] In the polyethylene production process, the melt index (melt index, MI) and density (density, ρ) of the product resin are generally used as product performance indicators. Taking the fluidized bed gas-phase polyethylene production process as an example, the melt index MI and density ρ of polyethylene determine the processing performance and end use of the product resin. However, due to the lack of reliable industrial on-line measuring instruments, the MI and ρ of the polyethylene production process have been mainly obtained through laboratory analysis of regular sampling of products for a long time, and quality control of the production process is carried out using this as a reference. Un...

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Problems solved by technology

[0005] The invention aims at the problem that the product quality of the industrial fluidized bed gas phase polyethylene device cannot be directly measured, so it is difficult to realize the quality control of the product resin and the online monitoring of the device operation, etc., and provides an online software for the product quality of the industrial fluidized bed gas phase polyethylene device. Measurement methods

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