Material detention period and distributing on-line measurement system and method

Abstract

The present invention relates to an online measuring system and a method for the residence time distribution of polymer, which belongs to the field of polymer processing. The present invention is used for evaluating the mixing performance of mixing equipment. The PC machine of the system is connected with an optical fiber sensor (6) through a data acquisition card. The optical fiber probe (1) of the optical fiber sensor (6) is arranged on an extruder head (4) and is directly contacted with the melted polymer which is mixed with tracer in the extruder head (4). The transmission light intensity received by the optical fiber has linear relationship with the index of the tracer concentration. So the transmission light is tested and the residence time distribution is obtained. The transmission received by the other optical fiber probe (2) is returned to the optical fiber sensor. The optical fiber sensor generates the corresponding analog quantity according to the intensity of the light received by the optical fiber sensor. A computer samples, so the curve of the residence time distribution analog signal changing with time is real-timely displayed. The present invention has the advantages that the structure is simple, the testing cost is low, the tracer used for measurement is easy to be obtained and so on.

Description

technical field [0001] The invention relates to an online measurement system and method for polymer residence time distribution, which belongs to the field of polymer processing and is used for evaluating the mixing performance of mixing equipment. Background technique [0002] The residence time refers to the time that the material stays in the equipment due to uneven distribution of flow velocity or back-mixing, or there is a "dead zone" in the equipment when the material passes through a continuously operating separation equipment or reaction equipment. The material with different residence time is expressed as the share of the total material quantity, which is the residence time distribution of the material. It is an important indicator for measuring the mixing performance of the equipment. [0003] The measurement of polymer residence time distribution is divided into offline measurement method and online measurement method. Off-line measurements were an early approac...

AI Technical Summary

Problems solved by technology

[0006] 1) The tracer used in the fluorescence method needs to be prepared through a chemical reaction for the extrudate in advance, and the procedure is complicated;

[0007] 2) Fluorescent agents are likely to cause photosensitive dermatitis and other occupational skin diseases, which are harmful to the operator's body;

[0009] 4) The cost of the whole set of test equipment is relatively high

Images