燃气锅炉增容与低氮燃烧改造设计方案及其应用

Design scheme and engineering application of capacity upgrading and low NO_x combustion retrofitting for gas boilers

针对燃气锅炉面临的增容及低氮燃烧问题,通过系统分析燃气锅炉增容及低氮燃烧改造所要解决的理论技术问题,得出相关计算和设计,据此形成了一套具有普适性的技术设计方案。以某台燃气锅炉增容和低氮燃烧改造为例,应用该设计方案通过综合评估、低氮燃烧设计、热力校核计算、水动力校核计算、汽包增容及强度校核计算、烟风阻力校核计算及经济性评价等过程详细论述了该方案。改造实施后,产汽量提高20%,单位燃料消耗量有所降低,NOx排放量减少约140t,锅炉效率增加了0.2%,预计3.5年可收回投资。

To solve the problems that gas boilers need to upgrade the capacity and reduce NOx emission during combustion,all technical problems were systematically analyzed.A general design scheme was formed by reorganizing all the related calculations and design unit.Moreover,capacity upgrading and low NOx combustion retrofitting of a gas boiler was taking as the example to verify the feasibility and operability of the general design scheme,by illustrating an engineering practice in detail including comprehensive evaluation,low NOx combustion system design,thermodynamic checking calculation,hydrodynamic checking calculation,drum capacity upgrading and strength checking calculation,flue wind resistance checking calculations and economic evaluation.After the transformation,the steam generation increased by 20 ％,the boiler efficiency rose by 0.2 ％,the unit fuel consumption dropped,the NOx emission reduced by 140 t,and the investment can be recovered within 3 to 5 years,according to the estimation.