Desulfurization and denitration integrative process for coke oven flue gas using dual ammonia solution: from laboratory to industrial test

doi:10.11949/j.issn.0438-1157.20161109

Abstract

Abstract:

An Integrated method of desulfurization and denitrification using dual ammonia solution (DAS) is presented to treat coke oven flue gas, which has advantages of low investment and operating costs. It not only makes full use of ammonia produced from coking main process as desulfurization and denitration agent but also produces ammonia sulfate product with the current devices. Firstly, the impact of the amount of ozone, ammonia concentration and temperature is experimentally studied, next, the amount of ammonia aqueous solution and flow-rate of circulating absorbent in industry test is optimized by simulation, finally, a novel multi down-comer (MD) slant-hole tray (SHT) with liquid self-distribution is designed and used as the internals for integrative desulfurization and denitration tower in industry test. Combing the process and device designing, an industrial test system of integrative desulfurization and denitration for coke-oven flue gas with feedstock as 10×10⁴ m³·h^-1 is completed. After a long and stable operation, concentration of SO₂ and NO in emission flue gas after purification, respectively, can be reduced below 10 mg·m^-3 and 150 mg·m^-3, satisfactorily meets the requirements of GB 16171-2012.

Key words: integrative process, desulfurization, denitration, dual ammonia solution, ozone, resource recovery, industrial test

摘要：

针对目前焦炉烟道气脱硫脱硝方法设备投资和运行成本偏高的不足，提出双氨法一体化脱硫脱硝工艺，充分利用焦化自产浓氨水作为脱硫脱硝剂，利用焦化自有硫铵工序作为脱硫脱硝产品的资源化平台，将脱硫脱硝工艺有机“镶嵌”入焦化主工艺。实验研究了臭氧用量、氨水浓度、温度等对脱硫脱硝的影响，通过模拟计算优化了浓氨水用量、循环喷淋量等工业脱硫脱硝塔的关键参数，最终设计了双氨法一体化脱硫脱硝工业实验流程，并选择自分布式多降液管斜孔塔板作为一体化脱硫脱硝塔的内件。结合工艺设计、设备设计，最终建成处理10×10⁴m³·h^-1的焦炉烟道气脱硫脱硝工业实验装置，脱硫脱硝后烟道气SO₂和NO可分别降至10 mg·m^-3和150mg·m^-3以下，完全满足GB 16171-2012的要求。

关键词: 一体化, 脱硫, 脱硝, 双氨法, 臭氧, 资源化, 工业实验

CLC Number:

TQ520

TANG Zhigang, HE Zhimin, Ebrahim, GUO Dong, ZHAO Zhijun, XING Xiao, WEN Yanming, WANG Dengfu, JIANG Aiguo, KANG Chunqing, LIU Jingxue. Desulfurization and denitration integrative process for coke oven flue gas using dual ammonia solution: from laboratory to industrial test[J]. CIESC Journal, 2017, 68(2): 496-508.

汤志刚, 贺志敏, Ebrahim, 郭栋, 赵志军, 邢潇, 温燕明, 王登富, 姜爱国, 康春清, 刘敬学. 焦炉烟道气双氨法一体化脱硫脱硝:从实验室到工业实验[J]. 化工学报, 2017, 68(2): 496-508.

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