燃用准东煤电站锅炉炉膛温度场分布及结渣特性试验研究

Experimental study on furnace temperature field distribution and slagging characteristic in a power plant boiler burning Zhundong coal

在掺烧准东煤电站锅炉试验中,通过改变SOFA风率和准东煤掺烧比,研究了SOFA风率和掺烧比对膛内火焰温度场分布及炉膛内结渣情况的影响。结果表明,一次燃烧区域火焰平均峰值温度随SOFA风率的增加而降低,而二次燃烧区域火焰平均峰值温度炉膛和烟气出口温度随SOFA风率的增加而升高。随着准东煤掺烧比增大,主燃烧区域温度升高,而在燃尽风区域火焰平均峰值温度则降低。SOFA风率最大时燃烧器中部区域结渣情况最为严重,而随着SOFA风率的减小,燃尽风上方区域的结渣情况越来越严重。随着掺烧比的增大,燃烧器中部区域和燃尽风上方区域的结渣情况均变得严重。里层渣样出现钠钙长石和赤铁矿的富集,随着结渣的发展,渣样中碱金属含量逐渐降低。

In the experiment of Zhundong coal co-firing in a boiler of thermal power plant,the effects of SOFA rate and blending ratio on furnace temperature field distribution and slagging characteristic was studied by changing the SOFA rate and blending ratio of Zhundong coal.As a result,the average peak flame temperature in primary combustion zone goes down with the increase of SOFA rate,but in secondary combustion zone it goes up and the outlet temperature goes up too.The temperature in primary combustion zone goes up with the increase of blending ratio,but in SOFA zone it goes down.The slagging in the middle of burner zone is the most serious when SOFA rate is the highest.With the decrease of SOFA rate,the slagging above SOFA zone becomes more and more serious.With the increase of blending ratio,the slagging in the middle of burner zone and above SOFA zone both become more and more serious.Enrichment of oligoclase and hematite occurs in the inner of slagging samples.With the development of slagging,the content of alkali metal in slagging samples gradually decreases.