【摘要】 为解决某电厂330 MW机组脱硝系统静态混合器、顶棚烟道以及反应器催化剂磨损严重的问题,采用Fluent软件对该机组脱硝系统进行了数值模拟。根据模拟结果初步分析造成磨损的原因,在此基础上针对性地对烟道中导流装置进行优化设计,并结合物模试验检验了数值模拟结果的可靠性以及相应设计的可行性,最终提出了移除反应器前竖井烟道中两层静态混合器、喷氨支管数量减半以及优化反应器前烟道中导流板数量和形状的方案。结果表明:优化后脱硝系统中低速涡流区与局部高速区显著减少,流场均匀性显著提升;首层催化剂上游截面速度分布标准偏差由原来的0.23降至0.07;脱硝系统整体阻力降低407 Pa,优化效果显著。更多还原

【Abstract】 In order to solve the abrasion of static mixer, ceiling flue and catalyst in the denitrification system of 330 MW power plant, the denitrification system of the unit was simulated by Fluent. According to the simulation results, the causes of wear are analyzed. On this basis, the optimal design of the flow guiding device in the flue is specifically designed.Combined with the physical model test, the reliability of the numerical simulation and the feasibility of the corresponding design are tested. Finally, the following scheme was proposed: removing the two-layer static mixer in the front shaft flue of the reactor, halving the number of ammonia-spraying branches, and optimizing the number and shape of the baffles in the front flue of the reactor. The results show that the low-speed eddy current zone and local high-speed zone in the optimized denitrification system are significantly reduced, and the flow field uniformity is significantly improved; the standard deviation of velocity distribution in the upstream section of the first catalyst is reduced from 0.23 to 0.07; the overall resistance of the denitrification system is reduced by 407 Pa, and the optimization effect is remarkable.更多还原