| 基于CFD的某330MW燃煤机组SCR脱硝系统混合器优化与验证 |
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| 引用本文： | 封例忠,丛日强,刘怡,齐艳芳. 基于CFD的某330MW燃煤机组SCR脱硝系统混合器优化与验证[J]. 环境工程, 2022, 40(10): 156-161. DOI: 10.13205/j.hjgc.202210021 |
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| 作者姓名： | 封例忠 丛日强 刘怡 齐艳芳 |
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| 作者单位： | 1. 河北省清洁生产技术服务中心, 石家庄 072550; |
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| 摘 要： | 为探明混合器形式对于燃煤机组SCR脱硝系统性能的影响，运用数值三维模拟对330 MW燃煤机组SCR脱硝系统烟道中烟气流动速度、温度、氨浓度以及流动方向进行了模拟计算，并采用物理模型对数值模拟结果进行验证。对比研究了使用不同形式混合器上下游速度场、NH3浓度场、压力损失及加工难度。结果表明：梯形板混合器加工简单、扰动范围大、压力损失大、对下游速度场影响大；扭叶片式混合器阻力小、对下游速度场几乎没有影响，但扰动范围小、安装角度要求高；六角星形混合器综合性能介于梯形板及扭叶片式混合器之间。六角星形混合器能够较好地实现NH3与烟气混合，下游速度场均匀性及NH3浓度均匀性满足设计要求。
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| 关 键 词： | SCR 流场优化 CFD数值模拟 微型混合器 |
| 收稿时间： | 2021-01-28 |
MICROMIXER IMPROVEMENT AND VERIFICATION FOR AN SCR DENITRATION SYSTEM OF A 330 MW COAL-FIRED POWER UNIT BASED ON CFD |
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| Affiliation: | 1. Hebei Cleaner Production Technology Service Center, Shijiazhuang 072550, China;2. Shenyang Shanshuiyuan Environmental Tech Co., Ltd, Shenyang 110013, China;3. Central Research Institute of Building & Construction, Beijing 100088, China;4. Hebei Bide Environmental Tech Co., Ltd, Shijiazhuang 050090, China |
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| Abstract: | In this paper, the flow velocity, temperature, ammonia concentration, and flow direction of flue gas in the SCR denitration system of a 330 MW coal-fired power unit were simulated by three-dimensional numerical simulation, and then the numerical simulation results were verified by a physical model. The results showed that the trapezoidal micromixer had the advantages of simple processing, large disturbance range, large pressure loss, and great influence on the downstream velocity field; the twisted vane micromixer had lower resistance and effect on the downstream velocity field, but smaller disturbance range and higher requirements on the installation angle. The comprehensive performance of hexagonal micromixer was between trapezoidal micromixer and twisted vane micromixer. The hexagonal micromixer could better realize the mixing of NH3 and flue gas, and the uniformity of downstream velocity field and NH3 concentration met the design requirements. |
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