表面燃烧改造对贯流锅炉热力平衡的影响  

Influence of Surface Combustion Renovation on Thermal Balance of Through Flow Boiler

作　　者：徐艳 程静 张美玲 XU Yan;CHENG Jing;ZHANG Meiling(Shenzhen Institute of Quality and Safety Inspection and Testing,Shenzhen 518109,China)

机构地区：[1]深圳市质量安全检验检测研究院,广东深圳518109

出　　处：《工业炉》2023年第5期15-18,共4页Industrial Furnace

基　　金：深圳市质量安全检验检测研究院研究项目(2022YC01)。

摘　　要：贯流锅炉采用表面燃烧改造后,由于辐射换热量大幅度的减少,水管的冷却效果降低,严重影响了原有的热力系统平衡,水管普遍产生密集性裂纹。从数值模拟的角度,模拟了贯流锅炉扩散燃烧方式和表面燃烧方式炉膛内燃烧和热量交换情况,通过对比发现,表面燃烧改造后烟气第一回程出口烟气温度和流速明显高于原扩散燃烧方式,高温烟气以较高流速冲刷第一回程出口处水管,解释了贯流锅炉表面燃烧改造后水管易产生密集性裂纹的原因。After the surface combustion transformation of tubular flow boiler,the cooling effect of water pipe is reduced due to the significant reduction of radiant heat transfer,which seriously affects the balance of the original thermal system,and the water pipe generally produces dense cracks.From the point of view of numerical simulation,the combustion and heat exchange in the furnace of the diffusion combustion mode and surface combustion mode of a through flow boiler is simulated.Through comparison,it is found that the flue gas temperature and flow rate at the first return outlet of the flue gas after the surface combustion transformation are significantly higher than those of the original diffusion combustion mode,and the high temperature flue gas washes the water pipe at the first return outlet with a high flow rate,which explains the reason why the water pipe is prone to produce intensive cracks after the surface combustion transformation of a through flow boiler.

关 键 词：贯流锅炉 表面燃烧 热力平衡 

分 类 号：TK229.8[动力工程及工程热物理—动力机械及工程]