高炉煤气氨法脱碳制备碳酸氢铵的试验研究  

Research on ammonia decarbonization of blast furnace gas to produce ammonium bicarbonate

作　　者：张士董 丁伯根 高杰 顾宝澍 春铁军 ZHANG Shidong;DING Baigen;GAO jie;GU Baoshu;CHUN Tiejun(School of Metallurgical Engineering,Anhui University of Technology,Ma’anshan 243032,Anhui,China)

机构地区：[1]安徽工业大学冶金工程学院,安徽马鞍山243032

出　　处：《烧结球团》2024年第6期104-110,共7页Sintering and Pelletizing

基　　金：安徽省自然科学基金资助项目(2408085Y030)。

摘　　要：高炉煤气有较高的CO_(2)含量,其中的CO_(2)捕集及资源化利用不仅有助于钢铁工业碳减排,还可以增加高炉煤气的热值。本文采用氨水作为吸收剂来捕获CO_(2)(氨法),分别研究氨水浓度、气液比、反应温度和高炉煤气CO_(2)体积分数等因素对CO_(2)减排的影响。结果表明:提高氨水浓度能够显著增强氨水对CO_(2)的化学吸附作用,提高氨水温度会加快CO_(2)的吸收速率,提高气液比能够使得喷淋塔中液体在喷洒装置的作用下与CO_(2)的接触更加充分。氨水浓度、温度、气液比的提高均能导致CO_(2)脱除率上升;随着CO_(2)的持续通入,NH 3和CO_(2)的物质的量之比减小,反应推动力随之降低,不利于CO_(2)的吸收。当氨水浓度为1.5 mol/L、气液比为1.3 L/m^(3)、反应温度为20℃、高炉煤气中CO_(2)体积分数为15%时,氨法CO_(2)脱除率可达90.73%。将吸收溶液进行蒸发,可得到白色晶体产物碳酸氢铵(NH 3HCO 3)。Blast furnace gas presents high CO_(2)content,and the CO_(2)capture and resource utilization of blast furnace gas cannot only help to reduce carbon emissions in the iron and steel industry,but also increase the calorific value of blast furnace gas.The ammonia is employed as an absorbent to capture CO_(2)(ammonia method),and the effects of ammonia concentration,gas-liquid ratio,reaction temperature and CO_(2)volume fraction of blast furnace gas on CO_(2)emission reduction are carried out.The results show that increasing the concentration of ammonia can significantly enhance the chemical adsorption of CO_(2)by ammonia,increasing the temperature of ammonia will accelerate the absorption rate of CO_(2),and increasing the liquid-gas ratio can make the contact between the liquid in the spray tower and CO_(2)more fully under the action of the spraying device,so increasing ammonia concentration,temperature and gas-liquid ratio can lead to the increase of CO_(2)removal rate.With the continuous introduction of CO_(2),the ratio of the amount of NH 3 to CO_(2)decreases,and the reaction impetus decreases,which are not conducive to CO_(2)absorption.When the concentration of ammonia is 1.5 mol/L,the gas-liquid ratio is 1.3 L/m^(3),the reaction temperature is 20℃,and the CO_(2)volume fraction in blast furnace gas is 15%,the CO_(2)removal rate of ammonia method can reach 90.73%.The absorption solution is evaporated to obtain the white crystal product ammonium bicarbonate(NH 3HCO 3).

关 键 词：高炉煤气 氨法脱碳 碳捕集 碳酸氢铵 

分 类 号：TF57[冶金工程—钢铁冶金] X701.7[环境科学与工程—环境工程]