制氨系统尿素质量分数测定方法改进  

An improved chemical method for detecting mass fraction of urea in ammonia preparation system

作　　者：向小凤[1] 张向宇[1] 陆续[1] 高宁[1] 张波[1] 徐宏杰[1] XIANG Xiaofeng;ZHANG Xiangyu;LU Xu;GAO Ning;ZHANG Bo;XU Hongjie(National Engineering Research Center of Clean Coal Combustion, Xi'an Thermal Power Research Institute Co., Ltd., Xi'an 710054, China)

机构地区：[1]西安热工研究院有限公司电站清洁燃烧国家工程研究中心,陕西西安710054

出　　处：《热力发电》2019年第4期116-120,共5页Thermal Power Generation

基　　金：中国华能集团有限公司总部科技项目(ZA-17-HKR02)~~

摘　　要：针对锅炉烟气脱硝系统还原剂氨的制备过程中尿素原料的质量分数测试,在GB/T2441.1—2008蒸馏后滴定法测定尿素总氮质量分数的基础上,结合尿素溶液测定方法,形成改进化学法。实验采集电厂某脱硝系统还原剂制备装置的尿素原料为实验样品,采用改进化学法获得的尿素质量分数为99.56%,与蒸馏后滴定法的结果相符;改进化学法获得的尿素质量分数与结合样品中缩二脲和亚甲基二脲质量分数反推出?、?、?值的标准计算法结果一致。结果表明,改进化学法准确可靠,可快速获得不同批次尿素质量分数,为现场工作提供数据依据。This paper focuses on detecting the mass fraction of urea during the preparation of ammonia, the reducing agent of flue gas denitration system in boilers. On the basis of post-distillation titration method in GB/T 2441.1?008 for determining the total nitrogen content of urea, and combining with the approach of urea solution test method, an improved chemical method was proposed to detect the urea content. Moreover, this method was applied to measure the mass fraction of the urea collected from ammonia preparation device of a power plant, and the value was 99.56%, which is consistent with that by the distillation titration method. Besides, this result also agrees with that obtained by the standard method (Back deriving the a,/J and / values by using mass fraction of biuret and methylene diurea in the sample). The improved chemical detection method is accurate, reliable and can obtain the mass fraction of urea from different batches rapidly, which can provides data basis for field work.

关 键 词：火电厂 脱硝系统 制氨 尿素水解 中试试验 尿素质量分数 改进 

分 类 号：TQ441.41[化学工程—化学肥料工业] TM621.8[电气工程—电力系统及自动化]