低阶煤一步法制备活性炭的脱硫脱硝性能

doi:10.13228/j.boyuan.issn0449-749x.20210340

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摘要活性炭法是能实现多种污染物综合控制的烟气治理技术,可同时处理烧结过程中产生的二氧化硫和氮氧化物等有害物质,但由于活性炭较高的生产和使用成本,限制了其在烧结烟气多污染物净化领域的推广应用。以低阶煤为基炭,氧化球团为活化剂,利用低阶煤热解和气化反应与铁氧化物还原之间的耦合作用,一步完成低阶煤炭化和活化,制备活性炭(SF AC),并与商品活性炭(ZJ AC)在产品工业分析、比表面积、碘吸附值、脱硫脱硝性能和再生活性炭吸附性能等方面进行综合比较。结果表明,SF AC的碘吸附值、比表面积分别为695.13 mg/g、370.42 m²/g,而ZJ AC仅530.54 mg/g、157.50 m²/g,单独脱硫时SF AC、ZJ AC的穿透硫容分别为368.11 mg/g、73.58 mg/g,单独脱硝时SF AC、ZJ AC的穿透硝容分别为250.39 mg/g、14.99 mg/g,前者较后者具有更优的吸附性能;就再生性能而言,SF AC、ZJ AC的脱硫脱硝性能均出现下降,但前者的脱硫脱硝性能更优;与单独脱硫、脱硝相比,两种活性炭同时脱硫脱硝时脱硫性能均提高,脱硝性能却降低,采用NH₃低温催化还原可改善脱硝性能差的问题。

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	潘建
	马雯卓
	朱德庆
	田宏宇
	杨聪聪
	王颖钰

关键词 ：低阶煤, 氧化球团, 活性炭, 脱硫脱硝, 烧结烟气

Abstract：Activated carbon method is a flue gas treatment technology that can realize comprehensive control of multiple pollutants,such as sulfur dioxide and nitrogen oxides generated in the sintering process. However,its popularization and application in sintering flue gas multi-pollutant purification field are limited because of its high production and use costs. Based on the coupling effect among pyrolysis of low-rank coal,gasification reaction of semi-coke and reduction of iron oxides,the low-stage coalification and activation were completed through a one-step method which using low-rank coals as carbon resource and oxidized pellets as activating agent,and the activated carbon (SF AC) was manufactured. Furthermore,the proximate analysis,specific surface area,iodine adsorption value,desulfurization and denitrification performance as well as regeneration performance of activated carbon were also conducted for comparison with those of the commercial activated carbon (ZJ AC). The results show that the desulfurization breakthrough capacities of SF AC and ZJ AC in separate desulfurization are 368.11 mg/g and 73.58 mg/g,respectively. And the denitration breakthrough capacities in separate denitration are 250.39 mg/gand 14.99 mg/g,respectively. The SF AC with iodine adsorption value of 695.13 mg/g and specific surface area of 370.42 m²/g has a better adsorption property than the ZJ AC with iodine adsorption value of 530.54 mg/g and specific surface area of 157.50 m²/g. In addition,the desulfurization and denitrification performance of regenerated ZJ AC and SF AC both show a decrease tendency,while the regenerated SF AC still has a better desulfurization and denitrification performance than that of regenerated ZJ AC. Compared with the separation process of desulfurization and denitrification,process of simultaneous desulfurization and denitrification will cause an increased desulfurization property and decreased denitrification property. The adverse effects can be improved by catalytic reduction of NH₃ under low temperature.

Key words： low-rank coal oxidized pellet activated carbon desulfurization and denitrification sintering flue gas

收稿日期: 2021-06-02

引用本文:

潘建, 马雯卓, 朱德庆, 田宏宇, 杨聪聪, 王颖钰. 低阶煤一步法制备活性炭的脱硫脱硝性能[J]. 钢铁, 2021, 56(12): 142-152. PAN Jian, MA Wen-zhuo, ZHU De-qing, TIAN Hong-yu, YANG Cong-cong, WANG Ying-yu. Desulfurization and denitrification performance of activated carbon prepared by one-step method from low-rank coal[J]. Iron and Steel, 2021, 56(12): 142-152.

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