燃煤锅炉降氮脱硝技术综述

我国未对燃煤火电厂排放的NOx有效的控制,使其排放量随嚣装机密量增跃而逐年增加,即将超越SO2成为第一气态污染物。针对目前严峻的形式,近年来脱硝技术成为烟气治理的重要研究方向。系统介绍低氮燃烧、干法、湿法等脱硝技术,探讨了其脱除过程及相关反应原理。     

低氮燃烧加SNCR脱硝技术在超临界锅炉上的应用

介绍了然料燃烧过程中NOx生成原理及控制技术,结合某600 MW超临界机组锅炉脱硝项目,分析了低氮燃烧加SNCR来减少NOx排放的工艺流程和技术特点,该系统的投产为其以后的推广做出了范例.     

A homogeneous-heterogeneously catalysed reaction system in a loop reactor

Catalytic three-phase reactions including homogeneous liquid-phase steps were simulated in a loop reactor. The loop reactor consisted of a reaction vessel, an external loop as well as an ejector. The loop reactor was modelled using tanks-in-series or alternatively, axial dispersion models. Kinetics of the reductive alkylation of aromatic amines, which was determined from the experiments in a laboratory autoclave, was used for verifying the reactor model and for concentration profile simulations in the loop reactor.     

NH_3选择性非催化还原NO的实验研究

在电加热的管式反应炉上进行了NH3选择性非催化还原(SNCR)NO气相均相反应的实验研究,结果表明:最佳脱硝温度约为925℃,最大脱硝效率约为83%。综合考虑脱硝效率、NH3漏失和运行成本,最佳氨氮摩尔比为1.5。NO初始浓度从300μL/L降到100μL/L,脱硝效率由83%降到57%,但是脱硝后NO的排放浓度几乎不变,约为50μL/L。当O2浓度从1%增加到10%,脱硝效率由91%降到75%,反应后剩余的NH3由43μL/L减少到10μL/L。925℃时SNCR反应完全进行需要1s以上的停留时间,而1000℃时只需0.4s。