声学测温装置耦合SNCR系统脱硝研究  

Study on DeNOx Performance of Acoustic Thermometry Coupled with SNCR System

作　　者：何术东 龙吉生 HE Shu-dong;LONG Ji-sheng(SUS Enwironment Co.,Ltd.,Shanghai 201703,China)

机构地区：[1]上海康恒环境股份有限公司,上海201703

出　　处：《四川环境》2025年第1期154-162,共9页Sichuan Environment

基　　金：国家重点研发计划(2022YFE0117300);南宁建宁康恒环保科技有限责任公司项目(JNKH-FD-2023-0037)。

摘　　要：垃圾焚烧发电厂在选择性非催化还原(SNCR)系统脱除氮氧化物过程中,有效的进行脱硝反应的温度区间为850~1100℃,其最佳温度区间为900~950℃。利用声波测温技术,在无时间延迟的情况下测得炉膛断面二维的温度场分布,结合SNCR系统喷枪安装位置进行区域化切割,通过温度控制喷枪的喷射状态,实现在变化的运行工况中,SNCR系统始终在最佳的温度范围内工作。结果表明:声学测温装置能快速准确的反应焚烧炉第一烟道的烟气温度变化,测温响应时间比热电偶响应时间快3~5min;声波测温温度场与SNCR系统耦合后,脱硝效率在氨水泵35Hz运行时提升19.09%~25.62%,氨水泵50Hz运行时提升5.98%~7.53%,为减少还原剂消耗、降低运行成本提供有力支持。In the oxynitride removal process of the waste-to-energy plants through selective non-catalytic reduction(SNCR),the effective reaction temperature range for DeNOx is 850-1100℃,and the optimal reaction temperature range is 900-950℃.In this study,acoustic thermometry is adopted to measure the distribution of two-dimensional temperature field in a hearth section without time delay.The hearth section is virtually segmented into various zones based on the arrangement of spray nozzles of the SNCR system.The jetting status of each spray nozzle is controlled according to the measured temperature field,so as to ensure that the SNCR system always works within the optimal reaction temperature range under the changing operating conditions.The results showed that the acoustic temperature measurement device can be used for quickly and accurately reflecting the temperature changes of the flue gas in the first pass of a reaction incinerator,and its temperature measurement response time was 3-5 minutes faster than that of the thermocouple.By coupling the acoustic temperature measurement field with the SNCR system,the DeNOx efficiency has increased by 19.09%-25.62% when the ammonia water pump operated at a frequency of 35 Hz and increased by 5.98%-7.53% at a frequency of 50Hz,which strongly helps to reduce the consumption of reducing agents and the operating cost.

关 键 词：声学测温技术 温度场 SNCR 

分 类 号：X701[环境科学与工程—环境工程]