生物质能因其CO2零排放和可再生的优点已成为能源领域研究的热点，如何合理并充分利用生物质能受到广泛关注。研究生物质三组分（纤维素、半纤维素和木质素）对生物质的着火及燃烧行为的影响机理，可用于生物质电厂的生物质种类选择与生物质掺混煤粉燃烧评估。采用Hencken平焰燃烧器和高速摄像机拍摄生物质三组分、3种生物质及对应的模拟生物质的着火延迟时间，结合辐射能测温技术探讨生物质三组分、3种生物质和模拟生物质的燃烧特性，分析生物质结构特性对其的影响。结果表明，生物质三组分中木质素的着火延迟时间最短，半纤维素其次，纤维素的着火延迟时间最长，其着火延迟时间分别为2.08、4.16和7.52 s。生物质与其对应的模拟生物质燃烧特性明显不同，且这种差异随生物质中木质素含量的增加而增强。纤维素和半纤维素焦着火发生后燃烧温度急剧增至1 000 K以上，而木质素焦着火后，颗粒温度增加相对平缓。实际生物质的着火延迟时间都长于模拟生物质，并且模拟生物质的着火延迟时间随木质素含量的增加而不断缩短。对于实际生物质，稻杆和板栗壳的峰值温度曲线趋势相近，板栗壳燃烧初期的温度更高，而竹子样品则呈较特殊的温度曲线。

Biomass energy has become a hot topic of energy field research due to its advantage of zero carbon dioxide emission and renewable energy. How to utilize biomass energy rationally and fully has been concerned by governments and scientific research institutions at home and abroad. The study on the influence mechanism of the three components of biomass (cellulosehe,micellulose and lignin) on the ignition and combustion behavior of biomass can be used for the selection of biomass species and evaluation of biomass and coal co-combustion in biomass power plants. Hencken flat flame burner and a high-speed camera were used to record the ignition delay time of three components of biomass,three types of biomass,and simulated biomass. Combined with the radiation energy temperature measurement technology,the combustion characteristics of three components of biomass,three types of biomass and simulated biomass were discussed,and the effects of biomass structure characteristics on the combustion characteristics were analyzed. The results show that the ignition delay time of lignin among the three components of biomass is the shortest,followed by hemicellulose,and cellulose has the longest ignition delay time,which are 2.08,4.16 and 7.52 s respectively. The ignition behavior of three kinds of biomass and the corresponding simulated biomass are obviously different,and this difference increases with the increase of lignin content in biomass. After the ignition of cellulose and hemicellulose coke,the combustion temperature increases sharply to more than 1 000 K,while the particle temperature increases relatively gently after the ignition of lignin coke. In addition,the ignition delay time of real biomass is longer than that of simulated biomass,and the ignition delay time of simulated biomass decreases with the increase of lignin content. For the real biomass,the trend of peak temperature curves of rice stalk and chestnut shell are close to each other,and the temperature of chestnut shell is higher at the beginning of combustion,while the temperature curve of bamboo is special.

0 引言

1 试验与方法

   1.1 试验装置

   1.2 试验样品制备

2 生物质三组分着火及燃烧特性分析

   2.1 着火时刻的定义

   2.2 三组分的着火行为

   2.3 生物质三组分着火延迟时间

   2.4 生物质三组分燃烧过程的温度变化

3 实际生物质与模拟生物质的燃烧特性对比

   3.1 实际生物质与模拟生物质着火延迟时间

   3.2 实际生物质与模拟生物质着火延迟时间

   3.3 竹子与模拟竹子燃烧过程的温度

   3.4 板栗壳与模拟板栗壳燃烧过程的温度

4 结论