| 基于非均匀入口条件SCR系统气固相组分的分布特性优化 |
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| 引用本文： | 周英贵, 金保昇. 基于非均匀入口条件SCR系统气固相组分的分布特性优化[J]. 环境工程学报, 2017, 11(1): 421-426. doi: 10.12030/j.cjee.201508193 |
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| 作者姓名： | 周英贵 金保昇 |
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| 作者单位： | 1.东南大学能源热转换及其过程测控教育部重点实验室, 南京, 210096 |
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| 基金项目： | 国家自然科学基金资助项目（51276038） |
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| 摘 要： | 采用实际工程中复杂的非均匀入口边界条件，对SCR系统气固两相流动特性及其优化进行了数值模拟。对烟道混合器下游截面上各测点处NO浓度进行实验测试，与数值模拟计算的NO浓度结果保持基本一致，模拟计算获得了SCR反应器入口导流板布置数量、倾角以及导流板间距的最优方案，催化剂首层入口截面烟气流速偏差系数Cx从18.13%降至12.38%。烟气中飞灰颗粒在反应器首层催化剂入口断面上呈现分布不均匀分布的特性，弯道C处无导流板时，截面中间区域的粉尘浓度一般在0.035 kg·m-3，最高值可达0.068 kg·m-3，弯道C加装导流板后首层催化剂入口烟道断面飞灰浓度不均匀偏差系数值由原有结构的34.21%降为26.18%，表明导流板结构有助于飞灰浓度均匀性分布。数值计算模型符合工程实际，具有很好的可靠性和实用性。
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| 关 键 词： | SCR 数值计算 气固相 非均匀入口 速度分布 NOx 颗粒 偏差系数 |
| 收稿时间： | 2015-11-23 |
Distribution characteristics optimization of gas-solid fluid for SCR system based on non uniform inlet condition |
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| ZHOU Yinggui, JIN Baosheng. Distribution characteristics optimization of gas-solid fluid for SCR system based on non uniform inlet condition[J]. Chinese Journal of Environmental Engineering, 2017, 11(1): 421-426. doi: 10.12030/j.cjee.201508193 |
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| Authors: | ZHOU Yinggui JIN Baosheng |
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| Affiliation: | 1.Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Southeast University, Nanjing 210096, China |
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| Abstract: | In this study, the optimization of gas-solid flow behaviors in an SCR system was simulated by the nonuniform inlet boundary conditions. The concentration of NO in the test section was consistent with the results of the numerical simulation of NO concentration. The optimal scheme of the number, dip angle, and spacing of the guide plate were obtained by the simulation. The flue gas velocity deviation coefficient Cx was adjusted to 12.38% from 18.13% in the entrance section of the first-layer catalyst. Furthermore, the distribution of the dust particles in the flue gas was not uniform. When corner C lacked a guide plate, the dust concentration in the intermediate zone of the inlet section was 0.035 kg·m-3, the maximum value was up to 0.068 kg·m-3 near the reactor wall, and the particle concentration deviation coefficient increased to 34.21% from 26.18%. When corner C had a guide plate, the structure of the guide plate was helpful to the distribution of the fly ash concentration. When the simulation and measured values were compared, they agreed well, which verified the accuracy and reliability of the model. |
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| Keywords: | SCR numerical calculation gas-solid phase non uniform inlet velocity distribution NOx particle deviation coefficient |
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