ABSTRACT

The flue gas after wet desulfurization carries a lot of water content and energy, so it is an effective method to improve the thermal efficiency of the boiler by recovering the water and waste heat through spray condensation. The numerical model of spray condensation is established, and its rationality is validated with experimental verification. The effects of structural parameters such as spray layer spacing, spray angle, the relative position of spray layer, nozzle density, condensing tower height, and operating parameters such as droplet diameter, liquid-gas ratio, spray water temperature, spray speed, flue gas velocity, and flue gas temperature on outlet flue gas temperature were studied. The results show that droplet diameter, liquid-gas ratio, spray water temperature, spray speed, and nozzle density have a great influence on flue gas temperature reduction. The optimal design parameter is determined with the droplet diameter less than 210 μm, the liquid-gas ratio greater than 3 L/Nm³, and the nozzle density of 19 nozzles/m².

摘要

湿法脱硫后的烟气携带大量的水分和能量，因此是通过喷雾冷凝回收水和废热来提高锅炉热效率的有效方法。建立了喷雾冷凝的数值模型，并通过实验验证了其合理性。结构参数的影响，如喷涂层间距，喷涂角度，喷涂层的相对位置，喷嘴密度，冷凝塔高度以及运行参数，如液滴直径，液气比，喷涂水温度，喷涂速度，烟道气研究了烟气流速，烟气温度对烟气出口温度的影响。结果表明，液滴直径，液气比，喷雾水温度，喷雾速度，喷嘴密度对烟气温度降低有很大影响。最佳设计参数取决于液滴直径小于210μm，液气比大于3 L / Nm^3个，喷嘴密度为19个喷嘴/ m ²。