合成氨装置转化炉烟气中氮氧化物达标排放技术改造  

REFORMATION OF NOx EMMISSION FROM THE FLUE GAS OF REFORMER IN SYNTHETIC AMMONIA PLANT

作　　者：唐小东 张志超 Tang Xiaodong;Zhang Zhichao(Aksu Huajin Fertilizer Co.,Ltd.,Aksu 842000)

机构地区：[1]阿克苏华锦化肥有限责任公司,新疆阿克苏842000

出　　处：《大氮肥》2024年第1期32-34,38,共4页Large Scale Nitrogenous Fertilizer Industry

摘　　要：分析了一段转化炉烟气中氮氧化物的形成机理,确定该装置一段转化炉烟气中氮氧化物主要由燃料气中弛放气部分夹带的氨燃烧所形成。通过对氨回收系统再生塔进行技术改造,将停用的氨回收系统的再生塔改造成水洗塔,采取下段循环洗涤、上段清水洗涤的两段洗涤方式除去弛放气中的氨,洗涤后产生的氨水通过管线送至尿素装置水解系统氨水槽中回收,洗涤后的弛放气与燃料天然气混合后送至转化炉燃烧,从而成功将一段转化炉烟气中氮氧化物由380 mg/m^(3)降至180 mg/m^(3)以下,实现了一段转化炉烟气中氮氧化物达标排放。Through the research and analysis of the formation mechanism of NOx in the flue gas of the reformer,it was determined that the NOx in the flue gas of the reformer was mainly produced by the combustion of NH3 entrained in the purge gas of the fuel gas.The regeneration tower of the stopped ammonia recovery system was transformed into a washing tower.The NH3 in the purge gas was removed by a two-stage washing method of circulating washing in the lower section and washing with clear water in the upper section.The ammonia water produced after washing was sent to the ammonia tank of the hydrolysis system of the urea plant through the pipeline for recovery.The purge gas after washing was mixed with fuel natural gas and sent to the reformer for combustion.The NOx in the flue gas of the reformer was successfully reduced from 380 mg/m^(3)to less than 180 mg/m^(3),so that the NOx emission of the flue gas of the reformer can be restrained within the standard.

关 键 词：一段转化炉 烟气 氮氧化物 洗涤塔 弛放气 达标排放 

分 类 号：TQ113.25[化学工程—无机化工]