Due to agglomeration of ash particles under low-low temperature conditions

ash deposition block occurs very easily in low-low temperature economizer and electrical static precipitator during actual operation. To deal with this issue

the authors built up a fixed-bed adsorption experimental bench and studied the agglomeration of particles adsorbed by sulfuric acid mist and the influence of various factors on the agglomeration. The results show that

there are four kinds of surface morphology of the individual particle and four kinds of agglomeration morphology between the particles. A layer of acid liquid film is formed on the particles' surface

which enhances the adhesion between particles and strengthens the agglomeration effect. In the initial stage

the small particles adhere onto the surface of large particles or the agglomeration between small particles occurs

followed by the agglomeration between large particles. The drop of adsorption temperature improves the agglomeration

but the improvement degree depends on the adsorption time. In the low-low temperature flue gas system

small variations in temperature will cause significant change of the agglomeration. The agglomeration effect decreases with the increasing particle size

and almost no agglomeration occurrs when the particle size increases to above 91 μ m.