...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Set up of an experimental apparatus for the study of fragmentation of solid fuels upon severe heating
【24h】

Set up of an experimental apparatus for the study of fragmentation of solid fuels upon severe heating

机译：设置用于研究严重加热下固体燃料破碎的实验设备

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

An experimental apparatus has been developed in order to perform tests of primary fragmentation of solid fuels under severe heating conditions. The device is a modified heated strip reactor, capable to reach 2000 C in less than 0.2 s. Particles are laid on the strip and pyrolysed under inert or moderately oxidizing conditions. The char particles and their fragments, generated upon pyrolysis, can be recovered and analysed to assess the fragmentation propensity of the fuel. Some preliminary experiments have been carried out on two biomass samples in order to assess the time-temperature history of particles in the experimental apparatus. In particular biomass particles of approximately 2–3 mm have been used. The temperature of the heated strip reactor in such preliminary tests was varied between 1000 and 1600 C, while the strip nominal heating rate was kept at 104 C/s and the holding time was set at the value of 10 s. A near infrared fast camera (38,000 frames/s) has been used to measure the temperature of the heated strip and of the particles during the tests. A heat up model was developed and validated against experimental results. The model was then used to estimate the temperature gradients across particles of biomass and of coal as well. Results show that the strip of the reactor reaches the set temperature in less than 0.2 s. When particles are laid on the strip, their bottom surface, which is in physical contact with the strip, immediately reaches the set temperature value. For 1 mm coal particles the upper surface can be considered at the same temperature as well. Under the most severe conditions tested (strip temperature of 1600 C , biomass particles of 2 mm thickness) the temperature difference between the bottom and the upper face is 200 C after 3 s and drops to 100 C after 10 s. On the whole the experimental apparatus simulates uniform heating of the particles with reasonable approximation. In the next future the apparatus will be further upgraded to operate at pressures up to 20 bars.
机译：为了在苛刻的加热条件下进行固体燃料一次破碎的试验，已经开发了一种实验装置。该设备是一种改进的加热带式反应器，能够在不到0.2 s的时间内达到2000C。将颗粒放在条带上，并在惰性或中等氧化条件下热解。可以回收并分析热解时生成的炭颗粒及其碎片，以评估燃料的碎裂倾向。为了评估实验装置中颗粒的时间-温度历史，已经在两个生物质样品上进行了一些初步实验。特别是使用了大约2–3 mm的生物质颗粒。在这种初步测试中，加热的带钢反应器的温度在1000至1600 C之间变化，而带钢标称加热速率保持在104 C / s，保持时间设置为10 s。在测试过程中，使用了近红外快速相机（38,000帧/秒）来测量加热后的钢带和颗粒的温度。开发了加热模型，并针对实验结果进行了验证。然后，该模型用于估算生物质和煤颗粒之间的温度梯度。结果表明，反应器带钢在不到0.2 s的时间内达到设定温度。当颗粒放在条带上时，与条带物理接触的底面立即达到设定温度值。对于1毫米的煤颗粒，其上表面也可以认为是在相同的温度下。在最严格的测试条件下（条带温度为1600 C，生物质颗粒的厚度为2 mm），底面和顶面之间的温差在3秒钟后为200 C，在10秒钟后降至100C。总体而言，实验设备以合理的近似值模拟了颗粒的均匀加热。在未来的将来，该设备将进一步升级以在高达20 bar的压力下运行。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号