CFB锅炉汽冷屏汇集集箱宽负荷集箱效应

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中图分类号：TK224.2 文献标志码：A

Header effect of platen superheater's collection headers under wide-load operation of a CFB boiler

MA Youfu1.23， CHENYu1，CHI Tonghui1，YANG Chao1，LYU Junfu2.3.4 （1.SchoolofEnergyandPowerEngineering，UniversityofShanghaiforScienceandTechnologyShanghai 293，China; 2.BeijingHuiroLbratoreig，ina;.ieachiteofioLbatoyn3i; 4.Department of Energy and Power Engineering， Tsinghua University， Beijing lOo084， China）

Abstract： With the expansion of new energy integrating into the grid， the demand for deep peak shaving of thermal power units has become increasingly prominent， imposing higher requirements on the wideload operation capability of power station boilers. The header effect significantly impacts the flow distribution uniformity of paralel tube groups in boiler superheaters. Investigating the header effect under wide-load operation is crucial to ensuring the safe and flexible operation of boilers. Taking the platen superheater of a 135MW circulating fluidized bed （CFB） boiler as an example， numerical simulations were conducted within the 10%～10% BMCR load range to analyze the flow and pressure distribution characteristics of working fluid in two header configurations with different tube diameters （outlet tubes ⊗219mm×14mm and outlet header ⊗377mm×20mm ）. The study aimed to investigate the impact of boiler load and tube diameter scale on the header effect of the collction header. The results reveal that as the tube diameter increases， the flow behavior in the header becomes more complex， and the header effect is enhanced. Conversely， as the boiler load decreases，the intensity of vortices and swirl in the header weakens， leading to a reduction in the header effect. A comparison between the simulated static pressure distribution results within the collection header and the hydrodynamic standard calculations in China shows that the standard calculations tend to overestimate the static pressure， with the degree of overestimation increasing as the collection header tube diameter becomes larger.

Keywords： circulating fluidized bed boiler; collection header; static pressure distribution; header effect

双碳战略提出以来，新能源在电力行业快速发展，装机容量逐年增长[1-2]。（剩余10153字）