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Influence of the release and combustion of volatiles on char reactivity of solid fuels

挥发分释放和燃烧对固体燃料焦炭反应性的影响

基本信息

批准号：
271235159
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：
2015
资助国家：
德国
起止时间：
2014-12-31 至 2017-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/271235159?language=en
关键词：
Influence release combustion volatiles char

项目摘要

The current project investigates the influence of volatile release and ignition conditions on the following char burnout of solid fuels, the latter being time-determining for the thermal conversion process. Char combustion has been investigated in many research activities. Experiments, which determine char combustion rate parameters, have been carried out with unprocessed fuels, devolatilizing in the experiment prior to char combustion, or with separately prepared char, leading to comparable char properties for experiments under varying conditions. It is a well-known fact, that the production conditions heating rate, temperature and holding time of the final temperature affect the reactivity of solid fuel chars. As the ignition of volatiles, which is typically not separated from the char combustion process in technical devices, influences the thermal conditions in a particles boundary region, this influence has to be investigated experimentally.This projects aims to investigate the influence of volatile combustion and ignition on the reactivity of solid fuel chars. Typical pulverized fuels (coals and biomass) will be burned in a lab-scale reactor. Characteristic particle sizes of dp= 100 µm are investigated, with varying oxygen content in the applied atmospheres realistic conditions will be simulated. The ignition process will be characterised by optical methods (chemiluminescence, imaging pyrometry with a newly developed camera system) and solid sampling. This enables to determine the time-dependent ignition process and the remaining solid (char). The results from the ignition experiments are used to define positions for char sampling. These samples will be re-fired later on to investigate char samples from different ignition conditions in equal combustion atmospheres. Char reactivity is characterized by measurement of particle temperature and diameter with the newly developed camera system. The temperature and diameter data will be used to calculate char burning kinetics parameters. These parameters will be used to identify the influence of ignition and devolatilization conditions on the subsequent char combustion process.

目前的项目调查挥发分的释放和点火条件对以下的固体燃料的焦炭燃尽的影响，后者是热转化过程的时间决定。煤焦燃烧已在许多研究活动中进行了研究。确定炭燃烧速率参数的实验已经用未处理的燃料进行，在炭燃烧之前的实验中脱挥发分，或者用单独制备的炭进行，导致在不同条件下实验的可比炭性质。众所周知，生产条件加热速率、温度和最终温度的保持时间影响固体燃料焦的反应性。由于挥发分的点燃通常不与技术装置中的焦炭燃烧过程分离，会影响颗粒边界区域的热条件，因此必须通过实验研究这种影响。本项目旨在研究挥发分燃烧和点燃对固体燃料焦炭反应性的影响。典型的粉状燃料（煤和生物质）将在实验室规模的反应器中燃烧。研究了dp= 100 µm的特征颗粒尺寸，并模拟了所用气氛中不同的氧含量。点火过程将通过光学方法（化学发光、使用新开发的摄像系统的成像高温测定法）和固体取样进行表征。这使得能够确定与时间相关的点火过程和剩余的固体（焦炭）。从点火实验的结果被用来定义位置的焦炭采样。这些样品将在稍后重新烧制，以研究在相同燃烧气氛中来自不同点火条件的炭样品。用新研制的摄像系统测量颗粒的温度和直径来表征焦炭的反应性。温度和直径数据将用于计算焦炭燃烧动力学参数。这些参数将被用来确定点火和挥发分条件对随后的焦炭燃烧过程的影响。