自动化博览
自動化博覽
자동화박람
Automation Panorama
2015年
9期
60-63
,共4页
在线优化控制%等摩尔比喷氨%氨逃逸%虚拟测量
在線優化控製%等摩爾比噴氨%氨逃逸%虛擬測量
재선우화공제%등마이비분안%안도일%허의측량
On-line optimization control%Equi-molar ratio of ammonia injection%Ammonia slip%The virtual measurement
SCR脱硝装置在设计阶段虽然进行了流场优化设计，以保证SCR入口截面烟气流速和NOx分布的均匀。但往往由于现场空间限制和安装因素影响，实际运行中SCR入口截面NOx分布偏差较大，经常达到20%以上，为保证排放NOx浓度和脱硝效率，部分区域氨过剩，反应器出口氨逃逸超出限值。这就提出了“等摩尔比喷氨”优化的理念，“SCR脱硝优化运行系统”就是基于此理论基础上，开发的SCR AIG喷氨格栅在线优化系统。系统根据机组运行的实际情况，分析截面分布图和变化趋势，可以有计划、有步骤地控制不同区域的喷氨量，实现不同区域不同的NH3/NOx摩尔比，从而充分发挥有限体积的催化剂的性能，在氨逃逸率较小前提下，实现较高的脱硝效率。
SCR脫硝裝置在設計階段雖然進行瞭流場優化設計，以保證SCR入口截麵煙氣流速和NOx分佈的均勻。但往往由于現場空間限製和安裝因素影響，實際運行中SCR入口截麵NOx分佈偏差較大，經常達到20%以上，為保證排放NOx濃度和脫硝效率，部分區域氨過剩，反應器齣口氨逃逸超齣限值。這就提齣瞭“等摩爾比噴氨”優化的理唸，“SCR脫硝優化運行繫統”就是基于此理論基礎上，開髮的SCR AIG噴氨格柵在線優化繫統。繫統根據機組運行的實際情況，分析截麵分佈圖和變化趨勢，可以有計劃、有步驟地控製不同區域的噴氨量，實現不同區域不同的NH3/NOx摩爾比，從而充分髮揮有限體積的催化劑的性能，在氨逃逸率較小前提下，實現較高的脫硝效率。
SCR탈초장치재설계계단수연진행료류장우화설계，이보증SCR입구절면연기류속화NOx분포적균균。단왕왕유우현장공간한제화안장인소영향，실제운행중SCR입구절면NOx분포편차교대，경상체도20%이상，위보증배방NOx농도화탈초효솔，부분구역안과잉，반응기출구안도일초출한치。저취제출료“등마이비분안”우화적이념，“SCR탈초우화운행계통”취시기우차이론기출상，개발적SCR AIG분안격책재선우화계통。계통근거궤조운행적실제정황，분석절면분포도화변화추세，가이유계화、유보취지공제불동구역적분안량，실현불동구역불동적NH3/NOx마이비，종이충분발휘유한체적적최화제적성능，재안도일솔교소전제하，실현교고적탈초효솔。
During the SCR design, in order to ensure the flue gas velocity and distribution of NOx at SCR inlet section, the SCR should be designed optimally about flue gas flow field. However, due to space limitations on site and installation quality, the distribution deviation of NOx at the SCR inlet is usually large, even more than 20%. Operator often injects more NH3 to control NOx emissions and De-NOx efficiency. However, it will be charged the some areas of ammonia slip over limitation at the outlet of SCR. The"Equi-molar ratio of ammonia injection"optimization concept is therefore proposed. Based on this theory, the"SCR optimal operation of the system"is developed, and the SCR AIG ammonia injection grid online optimization system is therefore implemented. According to the actual situation of the SCR, the system can achieve the planned and systematic control for the ammonia spray in different regions by analyzing the grid distribution and trends. The SCR performance can achieve high removal efficiency to maximize the finite volume of catalyst in the minimum for the rate of ammonia escape.
