除尘器区低温省煤器烟道数值模拟

为实现除尘器区低温省煤器的节能改造,基于FLUENT6.3软件,对除尘器区低温省煤器烟道的流场进行数值模拟研究。研究结果表明:除尘器前烟道内流场严重不均,转弯处有明显的高速区与漩涡区,局部速度高达32 m/s;加装低温省煤器后,两低温省煤器内流场不均,最大速度偏差系数达79.3%,严重影响低温省煤器的换热效果,同时会磨损、冲刷低温省煤器管路,危及低温省煤器的安全;除尘器入口处出现大面积的低速区域,导致进入除尘器后流场紊乱、除尘器电耗高、除尘效率低等现象,除尘器前烟道内整流消涡可以根治除尘器工作效率的问题。

Numerical simulation of low temperature economizers in the electrostatic precipitator area

To realize the energy-saving retrofit of low temperature economizers in the electrostatic precipitator area, the flow field in flue of the system was simulated by FLUENT 6.3. The results indicate that the flow field before precipitator appears extremely nonuniform, there are obvious high speed area and vortexes area in the deflection of the flue, the local maximum speed is up to 32m/s., the flow field is uneven in the both of the low temperature economizers after they are installed, and the maximum velocity deviation reaches 79.3%, which influences the heat transfer effect in the low temperature economizers greatly. There happens abrasion and scour in the low temperature economizers' pipes, which would endanger the safety of low temperature economizers. There appears large area at low velocity in the precipitator inlet, therefore the flow field is inordinate in the precipitator area, the precipitator power consumption is high and the collection efficiency is low. Optimizing the flow field and eliminating the vortexes can solve the precipitator efficiency problem. The results can provide reference for the engineering reform.