...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Thermal engineering >Studying the Aerodynamics of the TPP-210A Boiler Furnace When It Is Shifted to Operate with Dry-Ash Removal and Vortex Fuel Combustion
【24h】

Studying the Aerodynamics of the TPP-210A Boiler Furnace When It Is Shifted to Operate with Dry-Ash Removal and Vortex Fuel Combustion

机译：研究TPP-210A锅炉炉干式除灰和涡流燃料燃烧转换运行时的空气动力学特性

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

To reduce the amount of nitrogen oxide emissions and achieve more reliable operation of the TPP-210A boiler, a process arrangement for firing Grade TR Kuznetsk coal that involves using straight-flow burners and shifting the boiler from slag-tap to dry-ash removal is developed. Owing to a large burner downward slope angle and special arrangement of burners and nozzles, four large vertical vortices rotating in opposite directions are produced in the furnace lower part, as a result of which the combustion products dwell for a longer period of time in the burning zone and more complete fuel combustion is achieved. For verifying the operability and efficiency of the proposed combustion arrangement, investigations on a boiler furnace physical model were carried out using a technique for visualizing fuel jets and secondary and tertiary overfire air jets. The fuel jet temperature boundaries in the course of jet propagation in the furnace model are also determined. The study results have shown that staged fuel combustion will be set up with using the proposed arrangement of burners and nozzles. In addition, large vertical vortices produced in the furnace lower part will help to achieve more efficient use of the dry bottom hopper heating surfaces, due to which lower coal combustion product temperature in the furnace upper part and smaller content of combustible products in fly ash will be obtained. Owing to low values of air excess factor at the pulverized coal burner outlet and gradual admission of air into the vortex zone through a few nozzles with intense inner recirculation of combustion products to the jet initial section, staged combustion of pulverized coal and low nitrogen oxide emissions will be secured. Owing to expansion of fuel jets, a rapid growth of mass in the fuel jet is achieved, which is obtained both due to ejection of the jet itself and due to forced admission of hot fuel gases from other jets. Investigations carried out on the physical model have confirmed that the proposed combustion arrangement features high efficiency and that a low content of nitrogen oxides in flue gases is obtained.
机译：为了减少氮氧化物的排放量并实现TPP-210A锅炉的更可靠运行，用于燃烧TR级库兹涅茨克级煤的工艺装置涉及使用直流燃烧器并将锅炉从排渣转为干灰除尘。发达。由于较大的燃烧器向下倾斜角度以及特殊的燃烧器和喷嘴布置，在炉下部产生了四个沿相反方向旋转的大垂直涡流，因此燃烧产物在燃烧过程中停留的时间更长。区域和更完全的燃料燃烧得以实现。为了验证所提出的燃烧装置的可操作性和效率，使用可视化燃料喷嘴以及二次和三次过火喷嘴的技术对锅炉炉体模型进行了研究。还确定了炉模型中射流传播过程中的燃料射流温度边界。研究结果表明，采用建议的燃烧器和喷嘴布置将实现分级燃料燃烧。此外，在炉下部产生大的垂直涡流将有助于更有效地利用干燥的底部料斗加热表面，因为这将降低炉上部的燃煤产物温度，并减少粉煤灰中可燃产物的含量。获得。由于煤粉燃烧器出口处的空气过剩系数值较低，并且空气通过几个喷嘴逐渐进入涡流区，燃烧产物内部强烈再循环到喷嘴的初始部分，煤粉分阶段燃烧且氮氧化物排放量低将得到保护。由于燃料喷嘴的膨胀，因此实现了燃料喷嘴中质量的快速增长，这既由于喷嘴自身的喷射又由于来自其他喷嘴的热燃料气体的强制进入而获得。对物理模型进行的研究已经证实，所提出的燃烧装置具有高效率，烟道气中的氮氧化物含量低。

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