基于固体燃料粒度优化的烧结过程NOx减排

为了研究优化固体燃料粒度以减少烧结过程NOx排放，采用微型烧结燃烧装置进行不同粒度下单独焦粉颗粒的燃烧试验，以及焦粉分别为粗粒级(粒度为2.00～3.15 mm)、中间粒级(粒度为0.5～1.0 mm)、细粒级(粒度小于0.5 mm)下的固结试验，并在此基础上通过烧结杯试验研究了优化焦粉粒度对烧结NOx排放和产质量指标的影响规律。结果表明，随着焦粉粒度的减小，其燃烧过程NOx排放浓度和氮元素转化率均逐渐升高，且当焦粉为全粗粒级和中间粒级时，烧结固结强度得到改善。此外，将焦粉粒度控制在0.50～3.15 mm范围内，其NOx最大排放浓度和氮元素转化率分别降低约8%和27%，且烧结各项产质量指标都得到改善。

Reduction of NOx emission in sintering process based on #br# optimization of solid fuel particle size

In order to reduce the NOx emission by optimizing the size of solid fuel in iron ore sintering process, the combustion tests of coke breezes with different size and the bonding strength of sinter tests with coke breezes of coarse (2.00 3.15 mm), middle (0.5 1.0 mm) and fines (less than 0.5 mm) sizes were carried out by using micro sintering and combustion equipment, respectively. Then, the indexes of NOx emission and sinter were investigated with optimizing the size of coke breeze by sinter pot tests. The results showed that the NOx concentration and the conversion rate of N element increased with decreasing the size of coke breeze. At the same time, the bonding strength of sinter improved with coke breezes of coarse and middle sizes. At addition, when the size of coke breeze was between 0.50 and 3.15 mm, the maximum concentration of NOx and the conversion rate of N element decreased by 8% and 27%, respectively. The sinter indexes were also improved.