Determination of permissible salt content in oil-water emulsion

The analysis of statistical data and results of the experimental research of high temperature corrosion speed in steel 1X18H10T and steel 20 in the parts of the marine power plant at combustion of oil-water emulsion with air excess α = 1,5 and α = 3,0 with water content Wr = 30% and salt content over the range 16,9 to 490 mg/l is presented. On the basis of the plotted nomograms there is a possibility to choose the permissible salt content of oil-water emulsion depending on the speed of high temperature corrosion for carbon steel 20 and austenitic steel 1X18H10T at different temperatures of the heated surface wall metal and air excess in different grades of steel that makes it possible: to determine salt content in oil-water emulsion at the pre-set temperature of the heated surface metal at which permissible speed of high temperature corrosion of the given steel grade is provided; to determine the possible speed of high temperature corrosion at certain metal temperature and pre-set value of air excess α depending on salt content of water which can be obtained on board the ship and used to get oil-water emulsion with Wr = 30%; to determine the allowable range of salt content in the mixture of different types of water, available on board the ship, which can be used for fire neutralization in oil-water emulsion composition while providing permissible limits of high temperature corrosion speeds. The results of the conducted research on corrosion intensity allow to determine the required quality of water used for making oil-water emulsion. Knowing the permissible water quality (its salt content) it is also possible to estimate the reserves of various types of fresh water available on board the ship and the possibility of obtaining some additional amount of distillate on board the ship where combustion of oil-water emulsions with 30% water content in the ship power plant is planned