典型藻类生物质燃烧PM2.5的排放特性及机制  

Emission characteristics and mechanism of PM2.5 from typical algae biomass combustion

作　　者：刘建建 赵兵涛[1,2] 费灵子 苏亚欣 LIU Jianjian;ZHAO Bingtao;FEI Lingzi;SU Yaxin(School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093;Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering,Shanghai 200093;School of Environmental Science and Engineering,Donghua University,Shanghai 201620)

机构地区：[1]上海理工大学能源与动力工程学院,上海200093 [2]上海市动力工程多相流动与传热重点实验室,上海200093 [3]东华大学环境科学与工程学院,上海201620

出　　处：《环境科学学报》2019年第11期3685-3691,共7页Acta Scientiae Circumstantiae

基　　金：上海市自然科学基金项目(No.17ZR1419300);国家自然科学基金(No.50806049)

摘　　要：为探究典型藻类生物质燃烧过程中微细颗粒物PM2.5的排放特性及机制,采用一维管式炉对藻类生物质小球藻、条浒苔和马尾藻在不同燃烧温度下的PM2.5排放浓度进行实验研究.结果表明,PM2.5的排放特性随藻种而异且与燃烧温度密切相关.小球藻的PM2.5排放浓度随燃烧温度的升高而降低,600℃时的峰值浓度为138.667 mg·m^-3.与之不同的是,条浒苔和马尾藻的PM2.5排放浓度在单峰时随温度的升高而降低,双峰时随着温度的升高而升高,600℃时峰值最高分别为24.733 mg·m^-3和3.757 mg·m^-3,当温度从700℃升至900℃时3藻种的峰值时间提前,然而,小球藻峰值降低,条浒苔和马尾藻峰值均增加.在此基础上,对PM2.5的产量进行了分析,并根据各自的排放特性对其排放机制进行了分析.研究认为,高含量挥发分及碳氢化合物可能是小球藻微细颗粒物形成的主要来源.在高温状态下,条浒苔和马尾藻由于挥发分的快速释放和焦炭颗粒的膨胀导致孔隙扩张.To explorer the emissions and mechanisms of fine particals PM2.5 in the typical algae biomass combustion process, an one-dimensional tube furnace was used to exprimentally investigate the PM2.5 emission concentration from combustion of algae biomass Chlorella, Enteromorpha and Sargassum at varying combustion temperatures. The results showed that the PM2.5 emission characteristics vary with algae species and are closely related to the combustion temperature. For Chlorella it decreased with the increase of temperature and the peak value was 138.667 mg·m^-3 at 600 ℃. Unlike, for Enteromorpha and Sargassum it decreased with the increase of temperature at the single peak,and increased with the increase of temperature at the double peak. The highest peak values were 24.733 mg·m^-3 and 3.757 mg·m^-3 at 600 ℃. When the temperature was raised from 700~900 ℃, the peak time for three algae biomass was earlier. However, the peak value decreased for Chlorella while increased for Enteromorpha and Sargassum. On this basis, PM2.5 yields was analyzed. Furthermore, their emission mechanisms was inffered according to the emssion characteristics. It is suggested that the high content of volatiles and hydrocarbons may be the main sources of the formation of microparticles from Chlorella. At a high temperature, Enteromorpha and Sargassum have expanded pores due to the rapid release of volatile matter and the expansion of coke particles.

关 键 词：藻类生物质 燃烧 温度 PM2.5 排放 

分 类 号：X513[环境科学与工程—环境工程]