活性炭喷射吸附在烟气净化中应用的数值模拟分析

Sludge blending has become one of the means to transform the energy structure of coal-firedpower plants. Based on the existing coal-fired flue gas system of Zhejiang Jinhua Ningneng ThermalPower Plant, this paper proposed to add activated carbon injection purification technology in the fluegas system. Based on Fluent simulation and analysis, the numerical simulation analysis of theuniformity of the spray distribution of activated carbon in the flue gas was conducted from three aspects,such as the position of the spray point of single and multiple holes, the spray angle, and the mass flowrate of the spray, and the impact and safety of the activated carbon spraying system applied in the fieldof flue gas treatment were analyzed. The results showed that compared with single-nozzle injection,multi-nozzle injection could make the activated carbon distribution more uniform, but the cost washigher. For single-nozzle spraying, when the location of the spraying point was at the centre of the sec⁃tion from the horizontal elbow to the exit of the vertical elbow, the diffusion effect was good and the ac⁃tivated carbon had a long retention time. The economic efficiency was the highest when the spraying an⁃gle was selected to be parallel to the flue gas flow and the mass flow rate was selected to be 10 kg / h.For multiple-nozzle spraying, the adsorption effect of the activated carbon was better when the massflow rate was selected to be 15 kg / h, but the cost was higher. Whether it is single-nozzle injection ormulti-nozzle injection, parallel flue gas flow was chosen as the angle of activated carbon injection, inwhich the diffusion area was relatively large, the diffusion effect of activated carbon was relativelygood, and the distribution was relatively uniform in the cross-section. The application of activated car⁃bon injection system in the field of flue gas treatment has less impact on the environment and the safetyis within the controllable range.