尿基复合肥生产装置尾气洗涤系统液位显示虚高的原因分析及控制措施  

Analysis of reasons and improvement measures for high liquid level in washing system of tail gas in urea-based compound fertilizer production plant

作　　者：刘伟 曾贞 LIU Wei;ZENG Zhen(Hubei Dayukou Chemical Co.,Ltd.,Jingmen 433009,China)

机构地区：[1]湖北大峪口化工有限责任公司,湖北荆门433009

出　　处：《生态产业科学与磷氟工程》2025年第3期41-45,共5页Eco-industry Science & Phosphorus Fluorine Engineering

摘　　要：尿基复合肥生产装置中尾气洗涤塔吹气式液位计长时间显示液位为100%,不能准确显示真实液位。为便于优化工艺控制,依据吹气式液位计的工作原理分析液位显示虚高的原因,并根据尿基复合肥生产的特点提出改进措施。通过分析总结,造成液位显示虚高的主要原因为单吹气式液位计在带压容器液位测量上的局限性,当塔内压力远远高于大气压力时,无法满足测量要求。尿基复合肥生产时,对于带压容器采用两组吹气管路便可准确地检测出塔内液体的密度和液位,再在原装置基础上增加三组减压器和一台压力变送器,便可实现密度及液位的精确在线显示和监控;对旋风除尘器的旋灰器进行改造,提高除尘效率,保证洗涤工序平稳运行。The blowing type liquid level gauge in the tail gas washing tower of the urea-based compound fertilizer production device displays a liquid level of 100%for a long time,which cannot accurately display the true liquid level.To facilitate the optimization of process control,the reasons for the false high liquid level display are analyzed based on the working principle of the blowing type liquid level gauge,and improvement measures are proposed according to the characteristics of urea-based compound fertilizer production.Through analysis and summary,the main reason for the high liquid level is the limitation of the single blowing type liquid level gauge in measuring the liquid level of pressurized containers.When the pressure inside the tower is much higher than atmospheric pressure,it cannot meet the measurement requirements.When producing urea-based compound fertilizer,two sets of blowing pipelines can be used to accurately detect the density and liquid level of the liquid in the tower for pressurized containers.In addition,three sets of pressure reducers and one pressure transmitter can be added to the original device to achieve accurate online display and monitoring of density and liquid level.The ash unloader of the cyclone dust collection is revamped to improve the dust removal efficiency and ensure the smooth operation of the washing process.

关 键 词：尿基复合肥 尾气洗涤系统 吹气式液位计 液位高 密度 

分 类 号：TQ444[化学工程—化学肥料工业]