Preparation and performance evaluation of mercury removal adsorbents for natural gas

doi:10.16085/j.issn.1000-6613.2018-0886

Abstract

Abstract:

Mercury in natural gas may bring harm to the development and use of natural gas. The fixed bed adsorption method was used to remove mercury from natural gas. Mercury removal adsorbents were prepared by using Al₂O₃ and activated carbon composite particles as carriers, and carrying S、CuS and CuS _x as active substances were carried by dipping method. The influence of the preparation process conditions was investigated. The active components were characterized by X ray diffraction (XRD) and scanning electron microscopy (SEM). The results showed that CuS and S were successfully loaded on the carrier, of which the mass fraction of CuS was 12.80% and the total mass fraction of S was 8.32%. Effects of mercury content at the inlet and residence time on mercury removal of adsorbent were investigated. The mercury content of natural gas at outlet is 24.99μg/m³, which meets the requirement of industrial natural gas, with 300μg/m³ mercury content of treated natural gas at intet and the residence time 1s. When the residence time is 2s and the mercury content of the intake reaches 600μg/m³, the mercury content of outlet is 18.92μg/m³, less 28μg/m³. The mercury capacity of mercury removal adsorbents is 6.36%.

Key words: natural gas, mercury, adsorbents, sulfur, alumina

摘要：

天然气中含汞会对天然气的开发及使用带来危害，实验采用固定床吸附法脱除天然气中的汞。实验以Al₂O₃和活性炭复合颗粒为载体，通过浸渍法负载S、CuS和CuS _x 多组分活性物，制备了天然气脱汞吸附剂，考察了制备工艺条件的影响。采用X射线衍射检测（XRD）与扫描电镜（SEM）对活性物负载情况进行了表征。结果表明，在载体上成功负载了CuS和S，其中CuS质量分数为12.80%，总S质量分数为8.32%。以含汞空气模拟含汞天然气，考察了进气口汞含量、停留时间对脱汞吸附剂脱汞效果的影响。结果表明，脱汞剂处理汞含量为300μg/m³的天然气，停留时间为1s时，出口汞含量为24.99μg/m³，已达到工业天然气要求。当停留时间为2s、进气口汞含量达到600μg/m³时，经脱汞剂脱汞后，出口汞含量为18.92μg/m³，达到小于28μg/m³要求。脱汞吸附剂的汞容量达到6.36%。

关键词: 天然气, 汞, 吸附剂, 硫, 氧化铝

CLC Number:

TE645

Furong LIN, Yanyan ZHONG. Preparation and performance evaluation of mercury removal adsorbents for natural gas[J]. Chemical Industry and Engineering Progress, 2019, 38(02): 1107-1112.

林富荣, 仲艳艳. 天然气脱汞吸附剂的制备及其性能评价[J]. 化工进展, 2019, 38(02): 1107-1112.

Figures/Tables 14

References 15

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号点	C K	O K	Na K	Al K	Si K	S K	Cu K	合计
1号点	4.12	37.85	0.21	41.78	1.02	7.43	7.59	100
2号点	4.00	36.85	0.2	40.59	0.98	8.57	8.81	100
3号点	4.06	37.11	0.23	41.31	1.00	8.04	8.25	100
总体	4.02	37.15	0.2	40.98	1.00	8.22	8.43	100

号点	C K	O K	Na K	Al K	Si K	S K	Cu K	合计
1号点	4.12	37.85	0.21	41.78	1.02	7.43	7.59	100
2号点	4.00	36.85	0.2	40.59	0.98	8.57	8.81	100
3号点	4.06	37.11	0.23	41.31	1.00	8.04	8.25	100
总体	4.02	37.15	0.2	40.98	1.00	8.22	8.43	100

温度 /℃	进气口汞含量 /μg·m^-3	气速 /L·min^-1	脱汞剂使用体积/L	吸附柱串联数 /根	停留时间 /s
40	300	3	0.05	0.5	1
			0.075	0.75	1.5
			0.1	1	2
			0.2	2	4
			0.3	3	6
			0.4	4	8

温度 /℃	进气口汞含量 /μg·m^-3	气速 /L·min^-1	脱汞剂使用体积/L	吸附柱串联数 /根	停留时间 /s
40	300	3	0.05	0.5	1
			0.075	0.75	1.5
			0.1	1	2
			0.2	2	4
			0.3	3	6
			0.4	4	8

性能	油田公司要求	本研究的脱汞吸附剂
球状直径/mm	2～5，允许尺寸偏差±1	3.5
硫质量分数/%	≥5	8.32
载体孔隙度/cm³·g^-1	≥0.5	0.62
抗碎强度/MPa	≥1.58	3.3
吸附能力/kg·kg^-1	≥5	6.36