均流装置对垃圾焚烧烟气喷雾干燥净化影响

Influence of flow-equilibrating device on purification of flue gas from MSW incineration

采用RNG k-ε湍流模型和颗粒轨道模型,研究了均流装置对垃圾焚烧后烟气喷雾干燥塔净化过程的影响,考察了均流装置对烟气流线、浆滴颗粒空间分布、塔内阻力特性、粘壁率以及净化效率的影响规律。结果表明,加装均流装置后,烟气在塔内分布更加均匀;塔内阻力随着均流装置开孔区域直径增加而逐渐减小;当均流装置的开孔区域直径从0.2m增加到0.7m时,浆滴的粘壁率先增加再减小,且在直径为0.4m时达到最大值38.2%;加均流装置后,SO2及HCl脱除效率提高,脱硫效率由加装前的60.2%增加到68.5%;HCl的脱除效率由加装前的93.7%增加到97.6%。研究结果可为喷雾干燥塔结构优化及参数选择提供理论依据。

The influences of flow-equilibrating device on flue gas purification by spray drying are studied numerically with RNG k-ε turbulent model and stochastic droplet track model. The effects of flowequilibrating device on flue gas streamline, droplets distribution, internal resistance, adhering ratio and purification efficiency are investigated. The flow field is more uniform and symmetrical after the flow equalization plate is added. The internal resistance decreases gradually with increasing diameter of the opening area of flow equalization plate. The percentage of droplet adhering on the wall is first increased, and then decreased when opening area diameter increases from 0.2 to 0.7 m. The maximum value reaches 38.2 % when the diameter equals to 0.4 m. The purification efficiency for SO2 and HC1 has increased after the plate is added. The desulphurization efficiency increases from 60. 250/oo to 68. 56%. HC1 removal efficiency increases from 93. 73% to 97. 62%. The results can provide theoretical basis for flue gas purifying system optimization and parameters selection.