煤粉炉水冷刮板式干排渣技术研究

Research on Dry Slagging Technique of Water-Cooled Scraper in Pulverized Coal Furnace

摘要: 由于我国水资源短缺国情，干排渣技术得到提倡，但风冷式干排渣导致的炉底漏风问题无法避免。为避免漏风问题，提出一种新型间接水冷干排渣方式，采用数值模拟的方法研究了新排渣方式下，底渣的运动状态和冷却效果，对比了新排渣方式和传统排渣方式的优缺点，结果表明：新排渣方式在运输灰渣的同时加强了灰渣颗粒之间的混合，排渣温度更均匀，由于换热面积的降低导致降温效果略微低于钢带式运输方式，但仍满足运输阶段的排渣冷却，灰渣温度从523.15 K降低到449.9 K。新排渣结构下，冷却水流速高于0.5 m/s后排渣温度不再显著降低。

Abstract: Due to the shortage of water resources in our country, dry slag technology is advocated, but air leakage caused by air-cooled dry slagging system is unavoidable. In order to avoid air leakage, a new indirect water-cooled dry slagging method is proposed. Numerical simulation is used to study the motion state and cooling effect of bottom slagging under the new slagging method, and the advantages and disadvantages of the new slagging method and the traditional slagging method are compared. The results show that the new slagging method strengthens the mixing between ash particles while transporting ash, and the slagging temperature is more uniform. The cooling effect is slightly lower than that of the steel belt transportation method due to the reduction of heat exchange area, but it still satisfies the slagging cooling in the transportation stage, and the ash temperature decreases from 523.15 K to 449.9 K. Under the new slag discharge structure, the slag temperature no longer decreases significantly after the cooling water flow velocity is higher than 0.5 m/s.