低低温电除尘器烟风道流线型设计与分析
Design and analysis of streamlined shape flue gas duct for low-low temperature electrostatic precipitator
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摘要: 燃煤电厂烟风道用于输送烟气、冷风等介质，其设计优化不仅影响烟风道的流场分布均匀性、流量分配和系统阻力，而且会影响相关设备的运行状态。为了解决常规布置烟风道存在的流场均匀性较差、流量偏差大、阻力大等问题，结合某电厂1 000 MW机组配套低低温电除尘器进出口烟道，采用多尺度的研究方法，对常规烟风道和流线型烟风道进行设计与分析研究，对不同布置方式烟风道的流场分布均匀性、流量偏差、烟道阻力进行对比分析，并通过物理模型实验对CFD模拟的结果进行验证。CFD模拟结果与物模实验结果吻合性良好；流线型烟风道的布置较常规烟风道更简单，且流场分布均匀性、流量偏差、阻力都比常规烟风道有较大改善。采用流线型烟风道可起到较明显的节能降耗作用，为燃煤电厂烟风道优化设计提供参考。Abstract: The flue gas duct in a coal-fired power plant is used to convey the flue gas, cold air and other media. Its design optimization not only affects the uniformity of flow field distribution, the flow allocation and the system resistance, but also affects the operation state of the related devices. In order to solve the problem of poor uniformity of flow field, large flow deviation and resistance in the conventional flue gas duct, a multi-scale numerical method, with combination of the inlet and outlet duct of a low-low temperature electrostatic precipitator for 1 000 MW unit in a power plant, was used to design and analyze the conventional flue gas duct and streamlined shape flue gas duct, respectively. A comparative analysis on the uniformity of flow field distribution, flow deviation and resistance in flue gas duct with different layouts was made, and the physical model tests were conducted to verify the CFD simulation results. And a good fitting was observed between the CFD simulation results and the physical model test ones. Compared with the conventional flue gas duct, the streamlined shape duct presents a simpler layout, and an improved flow field distribution uniformity, flow deviation and resistance. This implied that the streamlined shape duct usage could lead to a remarkable energy saving, which will provide a reference for optimization design of flue gas duct in the coal-fired power plants.
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Key words:
- streamlined shape /
- flue gas duct /
- multi-scale /
- resistance /
- energy conservation /
- flow optimization
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