The swelling /shrinkage are complex phenomenon in the steam power plants.
One of the important reasons is the chemical effects, which causes a bubble
formation and hence serious foaming carryover problems in the boiler. The present
work is devoted to study and measure the chemical effects of the swelling and
shrinkage phenomena due to the disturbance of the variables in the drum boiler of
steam generation unit. The problem was studied and analyzed to find a suitable
solution to reduce the foaming carryover, and hence to control the swelling and
shrinkage phenomena. The theoretical part is describing the mathematical model
for the boiler variables. The drum pressure and drum level at different load
demands of boiler were measured experimentally. The feed water was treated
carefully in order to study the reduction of foam produced from a small amount of
lubricant oil in the boiler water. The foam was treated using silicon antifoam [SN
6010]. The experimental results proved that the silicon antifoam is efficient to
remove the foam completely and then reduce the disturbance in the pressure by
18.6% and the reduction in swelling and shrinkage was by 29.4%, and 16%