HIGH TEMPERATURE CORROSION WHEN BURNING WATER-OIL
Abstract
Receiving on the basis of pilot studies of quantitative data on influence of mineral part of fuel and water of a water black oil emulsion (WOE), temperature of a surface of metal tст and excess of air α when burning on intensity high-temperature corrosion (HTC) and determination of admissible level of salinity of HTC. Research of intensity of HTC are carried out on experimental installation when burning WOE with water content of Wr = 30% on the basis of M40 fuel oil at excess of air α=1,5. Preparation of an emulsion was carried out with use of tap water with salinity of 1482 mg/l (after chlorination) that defined salinity of WOE at the level of 490 mg/l, and distillate, with salinity of 50 mg/l that defined salinity of WOE of equal 16,9 mg/l. Results of pilot and analytical studies of high-temperature corrosion steel 20 and Cr18Ni10T are presented when burning a water black oil emulsion at excess of air to 3,0. It is shown that when using WOE with salinity to 180 mg/l the speed of high-temperature corrosion of steel 20 and Cr18Ni10T below admissible value of 0,25 mm/year. The conducted pilot studies, the analysis of their results and comparison to data of other authors allowed to formulate the following conclusions: the increase of chlorides with water (above a certain concentration) to fuel oil natriyvanadata when using WOE leads to HTC intensification; at wall temperatures at which fusion of pollution is observed, with increase in the content of the chlorine introduced with WOE water, HTC speed at salinity of WOE at the level of 490 mg/l is significantly higher in comparison with the mode of burning of fuel oil and especially than WOE with salinity of 16,9 mg/l.
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