煤与秸秆混烧生成物的数值分析与实验研究  

Numerical simulation and experimental study of products during co-firing of coal and straw

作　　者：徐承浩[1] 王翠苹[1] 

机构地区：[1]青岛大学机电学院,山东青岛266071

出　　处：《环境污染与防治》2013年第10期36-41,共6页Environmental Pollution & Control

基　　金：山东省自然科学基金资助项目(No.ZR2010EM004)

摘　　要：对煤与生物质混烧过程中主要气固生成物利用焓、熵和热容(HSC)热化学计算软件进行了理论计算,并利用沉降炉进行了燃烧实验研究。结果表明:(1)完全燃烧的数值计算结果中,温室气体总生成量随掺煤比增加而增加。(2)在800～1 000℃内,SO2生成量随掺煤比增加而增加。在燃烧终温高于960℃时,SO2生成量不再增加。(3)NOX生成量随掺煤比呈线性变化,随燃烧终温呈指数速率增长。(4)气相K2SO4随燃烧终温的升高而降低,气相KOH、KCl、HCl生成量随燃烧终温的升高而增加。低温燃烧有助于减少飞灰的腐蚀结渣等锅炉问题。(5)当掺煤比为60%(质量分数)时,硅铝酸钾生成量达到最大值;硅铝酸钙生成量不随燃烧终温变化,随着掺煤比呈线性变化。(6)总体上,实验和HSC热化学计算的主要化合物随掺煤比增加而变化的规律基本相同,KCl生成量随掺煤比增加逐渐降低,其他化合物生成量随掺煤比增加而增加;实验结果在个别掺煤比时存在波动。Theoretical calculation and experimental study of gas and solid products during co-firing of coal and straw was preformed with HSC thermal chemistry calculation software and drop-tube furnace. The numerical calcula- tion of complete combustion showed that the total production of greenhouse gas increased with increasing the coal blending ratio. When the combustion temperature ranged 80041 000 ~C ,the produced SO2 was positive correlated with coal blending ratio,however the SOz did not increase anymore if the ultimate temperature over the 960 ~C. The NOx production was liner changed with coal blending ratio, but it presented an exponential increase with ultimate combus- tion temperature. The production of gas phase K2 SO4 declined with the increasing of ultimate combustion tempera- ture,but gas phase KOH, KC1 and HC1 showed the different changing tendency. Low temperature combustion could help to reduce the ash deposit,ash slagging and ash corrosion on the convection heating surface. Potassium aluminum silicate achieved the maximum production when coal blending ratio was 60 % （wt） the production of silicon calcium aluminate did not change a lot with the terminal temperature, but was linear correlated with coal blending ratio. Gener- ally speaking, the change behavior of solid products during co-firing of coal and straw by numerical analysis were basi- cally consistent with experiment research conclusions. KC1 production was decreased when increasing the coal content, while the production of other compound was increased. The difference of numerical analysis and experiment results was only found at few coal blending ratios.

关 键 词：混烧 焓 熵和热容热化学计算 掺煤比 燃烧终温 

分 类 号：TK16[动力工程及工程热物理—热能工程]