关键词:

化学团聚, 燃煤飞灰, 润湿, 表面张力, 煤燃烧

Abstract:

Chemical agglomeration is one of the most effective methods to remove fine particles from coal fired power plants. The wetting of particles by agglomeration agent droplets plays an important role in the chemical agglomeration processes. The effect of wetter concentration and temperature on the wettability of the fly ash from Xiaolongtan power plant in three different wetting agents ［sodium dodecyl sulfate(SDS), sodium dodecyl benzene sulfonate(SDBS) and Triton X 100(TX100)］ was investigated. Laser particle size analyzer was used to determine the wettability of the fly ash. The results showed that only PM⁺₁₀ was completely wetted by water, but PM⁺_2.5 was wetted completely by 0.25% SDS solution, and PM⁺₁ was wetted completely by both 1% SDS and 0. 4%SDBS solutions under the experimental conditions. It was effective to wet the fly ash particles by dilute TX100 solution. With increasing temperature of wetter from 20℃ to 60℃, solution surface tension decreased and better wettability of the fly ash exhibited. Owing to the good performance of wetting agents investigated, this study identified some potential components for the synthesis of chemical agglomeration agents.

Key words:

化学团聚, 燃煤飞灰, 润湿, 表面张力, 煤燃烧