面向锅炉燃烧优化的炉膛动态建模  

Dynamic modeling for combustion optimization of coal-fired boiler furnace

作　　者：林博群[1] 沈炯[1] 李益国[1] 刘西陲[1] 吴啸[1] 

机构地区：[1]东南大学能源与环境学院,南京210096

出　　处：《东南大学学报（自然科学版）》2015年第5期903-909,共7页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51306082;51476027);江苏省产学研前瞻性联合研究资助项目(BY2013073-07)

摘　　要：为了设计炉膛燃烧动态优化控制器,提出了一种结合NOx产生机理的锅炉炉膛一维建模方法.通过将锅炉炉膛沿高度方向进行分层,并采用集总参数法分别描述锅炉各层内的流动、燃烧、传热和NOx生成过程,建立了能够表征锅炉燃烧特性的一维动态模型.通过对某HG220/100-10燃煤锅炉的建模仿真表明,所提出的模型能够正确反映出炉膛沿高度方向的一维温度分布及NOx分布,并能够准确反映不同配风方式对NOx排放的影响,以及各层风煤变化时炉膛出口处烟气温度、飞灰含碳量及NOx浓度的动态响应特性.相比传统三维模型,所建模型形式简单、计算量小,对于锅炉燃烧优化控制的设计能够起到关键的支撑作用.In order to design the controller of combustion dynamic optimization,a one-dimensional dynamic modeling approach for coal-fired boiler furnace on the basis of the reaction mechanism of NOx is developed.The furnace is first divided into several levels along the height direction.Then the lumped parameter method is employed to describe the flowing,combustion,heat transfer and NOx reaction behavior within each level,and a one-dimensional dynamic model which can represent the coal-fired boiler furnace correctly is built.The simulation results on a HG220 /100-10 coal-fired furnace show that the proposed model can reflect the distributions of one-dimensional temperature and concentration of NOx along the height direction of furnace and the impact of air distribution modes on the NOx exhausting.The dynamic characteristics of the temperature,the unburned carbon content and the concentration of NOx at furnace outlet can be obtained when the flows of coal and air change. Compared with the traditional three-dimensional models,the proposed model has a simple structure and is computationally efficient.Therefore,it is fundamental and can be utilized in the controller design of the boiler combustion optimization system.

关 键 词：集总参数法 炉膛一维模型 NOx产生机理 燃烧优化 

分 类 号：TK175[动力工程及工程热物理—热能工程]