陶瓷催化过滤管一体化脱除技术优化

Optimization on integrated removal technology of ceramic catalytic filter tubes

陶瓷催化过滤管一体化脱除技术适用于生物质电厂、钢铁、焦化、水泥、玻璃窑炉等SO_(x)、NO_(x)、粉尘的同时脱除,但烟气成分复杂,严重影响了陶瓷催化过滤管寿命。基于此,研究了一体化脱除塔前的预除尘装置,并优化一体化脱除塔入口结构,采用Fluent软件开展了气固两相流动计算。研究表明:重力沉降式除尘方法简单、阻力较小,但占地面积较大,对空间需求较高,飞灰粒径越大,沉降室的除灰效率越大;百叶窗式除尘装置安装较简单,不需对原有烟道进行改造,装置占用空间小,但该装置导流叶片过于密集时,阻力上升很快;小灰斗飞灰分离装置的整体结构较复杂,通过调整三角形挡灰板和小灰斗间距,调节装置阻力,占用空间较集中,不影响后续设备运行,入口速度为4.5 m/s时,整体除灰效率达到75.1%;一体化脱除塔入口设置复合导流装置可均匀分配来流,总差压约为249 Pa,气流分布系数为0.12。

The integrated removal technology of ceramic catalytic filter tubes is suitable for the simultaneous removal of SO_(x),NO_(x),and dust from biomass power plants,steel,coking,cement,glass furnaces,etc.,but the flue gas components are complex,which seriously affects the ceramic catalysis Chemical life of filter tubes.In order to solve the above problems,the pre-dust removal device before the integrated removal tower was studied,and the inlet structure of the integrated removal tower was optimized.The gas-solid two-phase flow calculation was carried out with Fluent software.The research shows that the gravity settling dust removal method is simple and the resistance is small,but it occupies a large area and requires a high space.The louvered dust removal device is simpler,and does not require modification to the original flue.The device occupies little space,but the resistance rises quickly when the guide vanes of this device are too dense.The overall structure of the small ash hopper fly ash separation device is relatively complex.By adjusting the triangular ash baffle plate,the distance between the small ash bucket and the small ash hopper can be adjusted to adjust the resistance of the device,and the space occupied is relatively concentrated,which does not affect the operation of subsequent equipment.When the inlet speed is 4.5 m/s,the overall ash removal efficiency reaches 75.1%.The inlet of the integrated removal tower is equipped with a composite infusion device to evenly distribute the incoming gas flow,the total differential pressure is about 249 Pa,and the airflow distribution coefficient is 0.12.