高压工况对天然气滤芯性能影响的实验研究

doi:10.11949/0438-1157.20201260

摘要/Abstract

摘要：

为探究高压工况下天然气滤芯的过滤性能变化规律及影响因素，选取了四种规格的滤芯为研究对象，开展了现场实验和实验室性能测试。发现在现场运行410 d后，四种滤芯的压差平均增长约20%，在相同气固过滤实验条件下压差增长速率更大，而四种滤芯的过滤效率和品质因子的差异相对缩小。高压工况下过滤材料压缩了7%~31%，大量颗粒嵌入过滤材料或沉积在表面，各过滤层的透气度普遍下降，而抗拉强度均有所上升。结果表明，选用孔径分布均匀的纤维材料、过滤精度梯级设计的复合材料，对过滤层打褶以及采用导流式骨架，均有助于滤芯在高压运行工况下长周期稳定可靠运行。

关键词: 天然气, 过滤, 多孔介质, 压差, 孔径

Abstract:

In order to explore the changing law and influencing factors of the filtering performance of natural gas filter elements under high pressure conditions, four types of filter elements were selected as the research objects, and field tests and laboratory performance tests were carried out. The evaluation was carried out in turn according to the technical standards, including the field test for about 410 d, the laboratory test before and after the field test, and the performance test on filter layers. It was found that after the field test, the pressure drop in filter cartridges increased by about 20%, and the rise rate of pressure drop increased even more under the same experiment condition of gas-solid filtration, while the relative difference of the filtration efficiency and quality factor decreased between the four types of filter cartridges. The filter layers were compressed by 7%—31% under the high-pressure condition. As particles were embedded or deposited at the filter media, the permeability of each filter layer generally decreased while the tensile strength of the material increased. Besides, some methods were shown to benefit the stable and reliable operation of the filter cartridge under high pressure conditions, including the selection of fiber material with uniform pore size distribution, composite material with cascade design of filtration accuracy, pleating of filtration layers and inlet side skeleton with pre-separation and diversion functions. The research provides a guidance for the development and optimization of separation cartridges suitable for high-pressure natural gas transportation.

Key words: natural gas, filtration, porous media, pressure drop, pore size

中图分类号:

TQ 028.2

刘震, 杜华东, 胡旭, 姬忠礼. 高压工况对天然气滤芯性能影响的实验研究[J]. 化工学报, 2021, 72(5): 2669-2679.

LIU Zhen, DU Huadong, HU Xu, JI Zhongli. Experimental investigation of influence of high-pressure condition on filtration performance of natural gas filter cartridge[J]. CIESC Journal, 2021, 72(5): 2669-2679.

图/表 14

表1 实验用天然气滤芯的基本信息

Table 1 Basic information of the experimental natural gas filter cartridges

滤芯代号	生产单位及型号	纤维过滤介质			滤材装配方式	外骨架形式	内骨架形式
滤芯代号	生产单位及型号	保护层	预过滤层	主过滤层	滤材装配方式	外骨架形式	内骨架形式
A	Jonell JMPG	棉	聚酯	聚丙烯	缠绕	百叶窗式	百叶窗式
B	PECO PCHG	无	聚酯	聚酯	缠绕	无	百叶窗式
C	BCB 52CC	棉	纤维素	玻璃	打褶	冲孔管式	冲孔管式
D	Shengda QLX	聚酯	聚酯	聚酯	缠绕	冲孔管式	冲孔管式

图1 天然气滤芯现场实验示意图

Fig.1 Field test schematic of natural gas filter cartridges

图2 天然气滤芯过滤性能评价系统

Fig.2 Filtration performance testing system of natural gas filter cartridge

图3 现场实验期间过滤器运行工况与压差曲线

Fig.3 Operating conditions and pressure drop of filters during the field test

图4 现场实验期间四台过滤器的粉尘收集量

Fig.4 Dust collection amount of four filters during the field test

图5 现场实验前后四种滤芯的过滤性能对比

Fig.5 Filtration performance of four filter cartridges before and after field test

图6 各过滤层材料厚度对比

Fig.6 Thickness comparison of filter layers

图7 滤芯D预过滤层横截面扫描电镜图片

Fig.7 The cross-section SEM images of filter cartridge D

图8 过滤材料的透气度对比

Fig.8 Permeability comparison of different filter material

图9 滤芯A1和C1过滤层的扫描电镜形貌

Fig.9 SEM images of filter layers in filter cartridge A1 and C1

图10 各过滤层材料的平均孔径对比

Fig.10 Comparison of average pore size of each filter layer

图11 滤芯A和D的预过滤层孔径分布

Fig.11 Pore size distribution of pre-filter layers of filter cartridges A and D

图12 各过滤层断裂载荷曲线对比

Fig.12 Comparison of fracture load curve of each filter layer

图13 各层滤材抗拉强度对比

Fig.13 Comparison of tensile strength of each filter layer

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