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Measurement of char burning kinetics of torrefied biomass with imaging two-colour pyrometry: Statistical burning rates of non-spherical particles

用成像双色高温测定法测量烘焙生物质的炭燃烧动力学：非球形颗粒的统计燃烧率

基本信息

批准号：
243672521
负责人：
Dr.-Ing. Martin Schiemann
金额：
--
依托单位：
Lehrstuhl für Energieanlagen und Energieprozesstechnik
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2013
资助国家：
德国
起止时间：
2012-12-31 至 2015-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/243672521?language=en
关键词：
Measurement char burning kinetics torrefied

项目摘要

Co-firing of biomass is a promising concept to reduce CO2-emissions from pulverized coal fired power plants. However, the use of raw biomass in pc-boilers is limited due to several problems. The fibrous structure of the most biomasses reduces their ability to be grinded into typical particle sizes, so that larger particles (in the range of millimetres, coal dust particles: 100 µm) with large aspect ratios appear. Furthermore, the heating value is lower than that of most coals, and the elementary and proximate composition is different from typical coal properties. A possible solution to shift a biomass into the property range of coal is the torrefaction process. In this process, thermochemical treatment is used to change the structure of biomass, so that the heating value and the carbon content increase and the grinding properties are improved.Sound design of pc-boilers requires detailed knowledge of the reaction rate of solid carbon, as this step dominates the particle conversion and energy release. The measurement of reaction rates of single burning torrefied biomass particles will be carried in a flat flame burner with a laminar gas flow. The necessary parameters, particle temperature, diameter and shape, will be measured with a high speed imaging two colour pyrometer. The measurement of temperature and diameter of burning particles enables to calculate the energy balance around single burning particles and to calculate burning rates and global burning kinetics of the cahr burning process. Scope of the project is the derivation of reaction rate parameters for the char of torrefied biomasss. For the first time, the particle shape will be considered, which is necessary especially for larger particles with high aspect ratios, which is typical for biomass particles. A statistical approach will be used to consider for the parameters of the kinetic models used here. The experimental data will include all stages of char burning in respect of reduced burning rates with proceeding burn out.

生物质共烧是一个很有前途的概念，可以减少燃煤电厂的二氧化碳排放。然而，由于几个问题，生物质原料在pc锅炉中的使用受到限制。大多数生物质的纤维结构降低了它们被磨成典型颗粒尺寸的能力，因此出现了具有大宽高比的大颗粒（在毫米范围内，煤尘颗粒：100微米）。其热值低于大多数煤，基本组成和近似组成与典型煤的性质不同。将生物质转化为煤性质范围的一个可能的解决方案是焙烧过程。在该工艺中，采用热化学处理改变生物质的结构，使热值和含碳量增加，改善研磨性能。pc-锅炉的合理设计需要详细了解固体碳的反应速率，因为这一步骤主导着颗粒转化和能量释放。单燃烧碳化生物质颗粒的反应速率的测量将在层流气体的平焰燃烧器中进行。必要的参数，粒子温度，直径和形状，将用高速成像双色高温计测量。通过测量燃烧颗粒的温度和直径，可以计算单个燃烧颗粒周围的能量平衡，并可以计算燃烧过程的燃烧速率和整体燃烧动力学。本项目的范围是推导碳化生物质炭的反应速率参数。第一次，将考虑颗粒形状，这是必要的，特别是对于具有高纵横比的大颗粒，这是典型的生物质颗粒。将使用统计方法来考虑这里使用的动力学模型的参数。实验数据将包括所有阶段的焦炭燃烧有关降低燃烧速率与继续燃尽。