摘要
针对催化剂生产过程中高氨氮废水处理耗能高、氨氮去除不彻底、易造成二次污染等问题,在Aspen Plus化工仿真模拟平台构造蒸汽汽提处理氨氮废水相关工艺模型,考察了废水pH、汽提塔塔板数、汽提塔操作压强、废水进料温度、蒸汽进料流量等因素的影响规律.结果表明:调节进料废水的pH为11、温度为80℃,进料蒸汽流量为400 kg·h-1、温度为130℃,汽提塔设置塔板数为20、常压操作,可使蒸汽单耗及整体操作成本较小;吸收塔的塔板数最优值为7,硫酸质量流量最优值为206 kg·h-1.最后基于相同氨氮废水数据,优化了蒸汽循环汽提/硫酸吸收工艺路线,最终该流程将蒸汽单耗降低到110 kg·h-1,实现了氨氮废水中氨氮零排放水准,还回收了一定浓度的硫酸铵产品.
Abstract
To address the problems of high energy consumption,incomplete removal of ammonia and nitrogen,and secondary pollution of high ammonia and nitrogen wastewater from catalyst plant,a process model of steam stripping for ammonia and nitrogen wastewater treatment based on Aspen Plus chemical simulation platform was constructed,and the influence of the theoretical number of plates in the stripping tower,the operating pressure of the stripping tower,the temperature of wastewater feed,and the flow rate of the steam feed,and so on were investigated.The results showed that,when the pH of feed wastewater was 11,the wastewater temperature was 80 ℃,the feed steam flow rate was 400 kg·h-1,the steam temperature was 130 ℃,the number of plates of the stripper tower was 20,and operating pressure was atmospheric pressure,the steam consumption and the overall operating cost were smaller;the optimal number of plates of the absorption tower was 8,and the optimal mass flow rate of sulfuric acid was 206 kg·h-1.Finally,based on the same data of ammonia wastewater,the process route of steam circulation stripping/sulfuric acid absorption was optimized,and finally the process reduced the steam consumption to 110 kg·h-1,realized the zero discharge level of ammonia nitrogen in ammonia wastewater,and also recovered a certain concentration of ammonium sulphate products.
维普
万方数据