
Analysis of literature data has shown that when sulfur fuels are burnt at boiler wall temperatures below 140°С, sharp increase of low-temperature sulfuric acid corrosion occurs due to condensation of sulfuric acid vapors. The rate of low-temperature corrosion at wall temperatures equal to 100°С is up to 1,2 mm/year, which limits the ability to lower the boiler surface temperature, and also limits the economy of exhaust gas boilers, auxiliary boilers and main boilers of ship power plants. Experiments showed that concurrently a solid salt layer is formed on surface that can be separated in the form of thin films in processing of the tubes after experiments with hydrochloric acid solution. The metal surface is shiny which is typical of passivation. Analysis of statistical data and results of experimental studies of low-temperature sulfuric acid corrosion intensity, depending on excess air factor α in the range 1,01...1,5, water content W r of fuel in the range 2...30% at heating surfaces temperatures ts within limits of 70...150°С are presented. When water-fuel emulsion is burnt with water content W r = 30% significant decrease in the corrosion rate to an acceptable level of 0,2...0,3 mm/year in absence of «peak» corrosion is observed, which occurs when standard fuel oil is burned (W r = 2%) at ts ≈ 110°С and α above 1,05. The value of wall temperature can be taken at 70°C only with α = 1,15 and with water content in emulsion W r = 30% at an acceptable value of 0,3 mm/year corrosion rate. The results of research show that as water content in the water-fuel emulsion increases up to 30%, corrosion rate of low-temperature heating surfaces in the area of «acidic peak» is reduced by 3…5 times, which makes it possible to reduce waste gases temperature and compensate the boilers lower efficiency when burning water-fuel emulsion with greater water content. With the decrease of air factor excess, the rate of corrosion is reduced when fuels with excess water content and low water content are burnt. Therefore, it is possible to reduce excess air factor α to the level of 1,05...1,07 either to maintain or to increase the efficiency
Представлен анализ статистических данных и результаты экспериментальных исследований интенсивности низкотемпературной сернокислотной коррозии в зависимости от избытка воздуха a в пределах 1,01...1,5 водосодержания W r топлива в пределах 2...30% при температурах поверхностей нагрева tcт в пределах 70...150°С. Установлено, что при сжигании водотопливной эмульсии с водосодержанием W r = 30% наблюдается существенное снижение скорости коррозии до допустимого уровня 0,2...0,3 мм/год при отсутствии «пика» коррозии, который имеет место при сжигании стандартных мазутов (W r = 2,0%) при tcт » 110°С и a выше 1,05
Представлено аналіз статистичних даних і результати експериментальних досліджень інтенсивності низькотемпературної сірчанокислотної корозії в залежності від надлишку повітря a в межах 1,01...1,5, водовмісту W r емульсії в межах 2...30% при температурах поверхонь нагрівання tcт в межах 70...150°С. Встановлено, що при спалюванні водопаливної емульсії з водовмістом W r = 30% має місце суттєве зниження швидкості корозії до допустимого рівня 0,2...0,3 мм/рік при відсутності «піка» корозії, що має місце при спалюванні стандартних мазутів (W r = 2%) при tcт » 110°С і a вище 1,05
низькотемпературна корозія; водопаливна емульсія; водовміст емульсії; надлишок повітря, low-temperature corrosion; water-fuel emulsion; water content in the emulsion; excess air, низкотемпературная коррозия; водотопливная эмульсия; водосодержание эмульсии; избыток воздуха
низькотемпературна корозія; водопаливна емульсія; водовміст емульсії; надлишок повітря, low-temperature corrosion; water-fuel emulsion; water content in the emulsion; excess air, низкотемпературная коррозия; водотопливная эмульсия; водосодержание эмульсии; избыток воздуха
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