在生物气燃烧中NOx排放的计算研究
Janaka Bandara1, Mahinsasa Narayana2, Christoph Bayer3
1Department of Chemical and Process Engineering, University of Moratuwa, Moratuwa, Sri Lanka. janakanayanajith@gmail.com.
概括
在沼气燃烧中优化多余的空气可以最大限度地减少有害的氧化 (NOx) 排放. 这项研究使用计算流体动力学 (CFD) 来找到理想的空气-燃料比率,以有效地生产生物气能源,减少污染.
科学领域:
- 燃烧科学 燃烧科学
- 环境工程 环境工程
- 计算流体动力学的流体动力学.
背景情况:
- 废物处理中的沼气可以作为燃料来源,但其燃烧会释放诸如氧化 (NOx) 等污染物.
- 在生物气体燃烧过程中控制多余的空气对于最大限度地减少这些有害排放和优化能源输出至关重要.
- 目前分析燃烧系统的现有方法往往缺乏有关排放动态的详细见解.
研究的目的:
- 开发和验证一个计算流体动力学 (CFD) 模型来模拟小规模的生物气燃烧.
- 分析变化的过剩空气水平对热量输出和氧化物排放的影响.
- 确定最佳的空气-燃料比率,以实现高效和低排放的沼气燃烧.
主要方法:
- 开发一个结合GRI-Mech反应机制和动态自适应化学 (TDAC) 算法的CFD模型.
- 根据DLR-斯图加特CH4 / H2 / N2喷气火焰的实验数据验证了CFD模型.
- 在各种预混合等效比率中模拟生物气的燃烧,使用同流的自然空气供应导向.
主要成果:
- 该CFD模型准确地模拟了沼气燃烧,并根据实验数据验证了结果.
- 该研究确定了0.85至1.1的最佳预混合等效比率范围.
- 这种最佳范围产生了最高的燃烧温度和最低的NOx排放量.
结论:
- 开发的CFD模型有效地预测了沼气燃烧系统的热量输出和氧化物排放.
- 优化空气-燃料比率是提高能源效率和减少生物气利用对环境的影响的关键.
- 这种建模方法有助于气相燃烧系统的排放分析和优化.
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