钢铁企业除尘用涤纶滤料在复杂烟气环境下的老化行为分析

doi:10.12068/j.issn.1005-3026.2024.06.017

摘要/Abstract

摘要：

为研究高温烟气中酸碱耦合作用对滤料性能的影响，在3种不同温度（45，75和130 ℃）下对涤纶滤料进行酸碱交互老化试验.发现涤纶滤料在高温酸碱耦合环境下的耐水解性能较差，且先受到碱再受到酸腐蚀对滤料产生巨大影响.在130 ℃下，经碱性环境和酸性环境的交互老化后，滤料的拉伸断裂强力和面层剥离强力分别为由1 638.8，143.1 N下降到1 100.8，19.1 N，FT-IR（Fourier transform infrared spectroscopy）显示，C—O吸收峰减弱，表明水解过程中的聚对苯二甲酸乙二醇大分子链断裂，这也是发生水解和性能下降的主要原因.

关键词: 涤纶针刺毡, 钢铁行业废气, 高温酸碱交互, 机械性能, 表面形貌, 化学结构

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

中图分类号:

TS 174

代峰, 柳静献. 钢铁企业除尘用涤纶滤料在复杂烟气环境下的老化行为分析[J]. 东北大学学报（自然科学版）, 2024, 45(6): 883-889.

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.

图/表 10

表1 涤纶滤料基本参数

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

图1 高温下酸碱交互腐蚀过程

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

图2 面层剥离示意图

Fig.2 Schematic diagram of surface layer peeling

图3 不同老化程度下滤料的机械性能（a）—拉伸断裂强力；（b）—面层剥离强力.

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

图4 不同老化程度下滤料的面密度和透气度变化率

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

图5 SEM图像展示纤维表面形貌（a）—P-0；（b）—P-2；（c）—P-4；（d）—P-6.

Fig.5 SEM images showing the fiber surface morphology

图6 SEM图像中4组试样对应的纤维直径

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

图7 不同老化程度下滤料纤维红外光谱

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

图8 分子链断裂结构图（a）—在酸溶液中；（b）—在碱溶液中.

Fig.8 Molecular chain breakage structure diagram

图9 不同老化程度下滤料耐热性能（a）—失重率TG曲线；（b）—失重速率DTG曲线.

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

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