分区控氨技术在炼油厂选择性催化还原烟气脱硝中的应用

发布时间：2018-01-21 06:49

本文关键词： 烟气脱硝分区喷氨 NOx分布氨逃逸脱硝率　出处：《石油炼制与化工》2017年05期 　论文类型：期刊论文

【摘要】：针对选择性催化还原(SCR)脱硝反应器同截面温度分布不均,导致NO_x浓度分布不均,严重影响脱硝效果,采用传统的均匀喷氨方式无法有效解决脱硝率低、局部氨逃逸的问题,以炼油厂自备锅炉SCR脱硝装置为研究对象,在SCR脱硝反应器入口烟气NO_x浓度分布不均的情况下,采用分区喷氨的控氨方式,提高脱硝率的同时改善反应器出口截面NO_x浓度分布的均匀性,有效控制了氨逃逸。分区喷氨与均匀喷氨实验数据相比,分区喷氨后脱硝率提高11.5百分点,氨耗量减少5kg/h,氨逃逸浓度降低77.5%。根据温度和浓度的关系估算,均匀喷氨时反应器入口同截面温度最高处和最低处温差应不超过30℃,否则需考虑分区喷氨方式。
[Abstract]:Selective catalytic reduction (SCR) denitrification reactor with the section temperature distribution is uneven, resulting in uneven distribution of NO_x concentration, seriously affected the denitrification effect, using uniform injection ammonia traditional methods can not effectively solve the denitrification rate is low, local ammonia escape problems in refinery owned boiler denitration device on SCR the object in the SCR denitrification reactor entrance flue gas NO_x concentration under the condition of uneven distribution, the control way of ammonia ammonia partition, improve denitrification rate and improve reactor outlet NO_x concentration distribution, the effective control of ammonia escape. The partition of ammonia injection compared with uniform injection ammonia experimental data partition after ammonia denitrification rate increased by 11.5 percentage points, ammonia consumption is reduced 5kg/h, 77.5%. decreased the concentration of ammonia escape according to the relationship between temperature and concentration estimation, uniform injection ammonia reactor at the highest temperature at the same section entrance and the lowest temperature should not exceed 30 degrees, or not It is necessary to consider the zoning method of ammonia injection.

【作者单位】：中国石化抚顺石油化工研究院;
【分类号】：X742
【正文快照】： 氮氧化物是大气主要污染物之一,降低炼油厂锅炉尾气NOx排放越来越受到关注[1-4]。选择性催化还原(SCR)技术是当前研究广泛、技术成熟的NOx末端处理工艺[5]。SCR烟气脱硝的原理是在催化剂作用下,在烟气中喷入还原剂NH3,将烟气中的NOx还原成N2和H2O[6]。烟气NOx与还原剂NH3适宜

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