Analysis of the Aging Behavior of Polyester Filter Media for Steel Companies in a Composite Environment

doi:10.12068/j.issn.1005-3026.2024.06.017

Abstract

Abstract:

To study the effect of high?temperature flue gas on the performance of filter bags， acid?base interaction aging tests were conducted on polyester filter media at three different temperatures （45， 75 and 130 ℃）. The results revealed that polyester filter media exhibited poor resistance to hydrolysis in high temperature acid?base coupled environments， and when subjected to alkali followed by acid corrosion， the filter media experienced significant degradation. The tensile breaking strength and surface peeling strength of the filter media decreased from 1 638.8 and 143.1 to 1 100.8 and 19.1 N， respectively， after interactive aging in alkaline and acidic environments at 130 ℃， FT-IR showed that the C—O absorption peak was weakened， indicating that the macromolecular chain of polyethylene terephthalate was broken during hydrolysis， which was the main reason for the occurrence of hydrolysis and performance degradation.

Key words: polyester needle felt, iron and steel industry waste gas, high temperature acid?base interaction, mechanical properties, surface morphology, chemical structure

CLC Number:

TS 174

Feng DAI, Jing-xian LIU. Analysis of the Aging Behavior of Polyester Filter Media for Steel Companies in a Composite Environment[J]. Journal of Northeastern University(Natural Science), 2024, 45(6): 883-889.

Figures/Tables 10

Table 1 Parameters of polyester filter material

厚度/mm

平均纤维直径/μm

1.85±0.083

16.94±0.805

Fig.1 Acid?base interaction corrosion process at high temperature

Fig.2 Schematic diagram of surface layer peeling

Fig.3 Mechanical properties of filter media under different degrees of aging

Fig.4 Surface density and breathability of filter media under different degrees of aging

Fig.5 SEM images showing the fiber surface morphology

Fig.6 Fiber diameters corresponding to the four groups of specimens in the SEM images

Fig.7 FT-IR spectra of fibers of filter media with different degrees of aging

Fig.8 Molecular chain breakage structure diagram

Fig.9 Heat resistance of filter media under different aging levels

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