洁净煤技术

2020, v.26;No.130(06) 182-188

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焦炉烟气活性炭法多污染物协同控制工业化试验研究
Industrial experimental study on the multi-pollutant collaborative control with activated carbon for coke oven flue gas

王斌;李玉然;刘连继;陈鹏;郭俊祥;林玉婷;朱廷钰;
WANG Bin;LI Yuran;LIU Lianji;CHEN Peng;GUO Junxiang;LIN Yuting;ZHU Tingyu;Beijing Engineering Research Center of Process Pollution Control,National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology,Institute of Process Engineering,Chinese Academy of Sciences;Tangshan Iron & Steel Group Co.,Ltd.;

摘要(Abstract):

目前我国大气污染形势依然严峻,活性炭法烟气多污染物协同控制技术可同时脱除SO_2、NO_x、H_2S等多种污染物,不消耗水,无二次污染,在国内已应用于钢铁烧结烟气、焦化焦炉烟气等,但其效率有待提高。焦化行业焦炉烟气低硫高氮、多污染物共存的排放特征,对活性炭法的脱硝效率及多污染物脱除效果提出了更高要求。为了探究提高焦炉烟气净化效率的因素,建设了焦炉烟气活性炭法多污染物协同控制工业化试验平台,处理烟气量33 000 Nm~3/h。通过调控活性炭移动速率和喷氨量,优化了焦炉烟气净化效率,分析了移动过程对活性炭物理性能的影响、再生后活性炭性质的变化和活性炭的碳消耗。结果表明,活性炭法多污染物协同控制技术的脱硫效率超过99%,脱硝效率达到80%,各排放指标满足特别排放限值(NO_x浓度≤150 mg/Nm~3、SO_2浓度≤30 mg/Nm~3、颗粒物浓度≤15 mg/Nm~3)要求。移动过程使活性炭的耐压强度下降33%~55%,尤其是直径较小的活性炭,耐磨强度有所下降,但降幅较小,这两项参数的下降会导致活性炭损耗量增加。再生后元素S的回收率达90%,吸附后(再生前)活性炭的比表面积相比新鲜活性炭下降了约20%。活性炭物理碳磨损取主要决于活性炭的移动速率,化学碳消耗来自官能团的分解,活性炭的年损耗量约为初装量的10.7%。
Now the situation of air pollution in China is still serious.The multi-pollutant collaborative control with activated carbons can simultaneously remove multi-pollutant,such as SO_2,NO_x and H_2S without water consumption and secondary pollution.It has been used in the flue gas purification of iron-steel sintering and coke oven et al,but the purification efficiency needs to be improved.In the coking industry,the activated carbon technology demands a higher denitrification efficiency and effectively capturing multiple pollutants for the coke oven flue gas with the emission characteristics of low sulfur,high nitrogen and multi-pollutant coexisting.In order to explore the factors to improve the efficiency of coke oven flue gas purification,the industrial test platform was built for multi-pollutant collaborative control with activated carbon for coke oven flue gas purification.The flue gas flow rate was 33 000 Nm~3/h. The moving speed of activated carbon and ammonia injection quantity were adjusted to investigate and optimize the flue gas purification efficiency. The effect of moving process on physical properties of activated carbon,properties of activated carbon after regeneration and carbon consumption were analyzed.The results indicate that the desulfurization efficiency and denitrification efficiency of the multi-pollutant collaborative control technology with activated carbon are more than 99% and 80%,respectively.The emission indexes meets the special emission standards( NO_x≤150 mg/Nm~3,SO_2≤30 mg/Nm~3,PM≤15 mg/Nm~3).The compressive strength of activated carbon obviously decreases by 33%-55% during the moving process,especially for the smaller diameter activated carbon,while the abrasion resistance decreases slightly,but the decrease range is small.The decrease of these two parameters will increase the consumption of activated carbon.The recovery rate of elemental sulfur in the regeneration process is up to 90%,and the specific surface area of activated carbon after adsorption( before regeneration) is approximately20 percent lower than fresh activated carbon.The physical carbon abrasion of activated carbon mainly depends on the moving speed,and the chemical carbon consumption depends on decomposition of the functional groups.The total carbon consumption of activated carbon is approximately 10.7 percent per year of the first loading capacity.

关键词(KeyWords): 活性炭;脱硫脱硝;焦炉烟气;多污染物协同控制
activated carbon;desulfurization and denitrification;coke oven flue gas;multi-pollutant collaborative control

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划资助项目(2017YFC0210600);; 河钢集团唐钢公司产学研项目

作者(Author): 王斌;李玉然;刘连继;陈鹏;郭俊祥;林玉婷;朱廷钰;
WANG Bin;LI Yuran;LIU Lianji;CHEN Peng;GUO Junxiang;LIN Yuting;ZHU Tingyu;Beijing Engineering Research Center of Process Pollution Control,National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology,Institute of Process Engineering,Chinese Academy of Sciences;Tangshan Iron & Steel Group Co.,Ltd.;

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DOI: 10.13226/j.issn.1006-6772.19120301

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