Typically the ash value is in the range 003007 Excessive ash in liquid fuels

Typically the ash value is in the range 003007

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Typically, the ash value is in the range 0.03–0.07%. Excessive ash in liquid fuels can cause fouling deposits in the combustion equipment. Ash has erosive effect on the burner tips, causes damage to the refractories at high temperatures and gives rise to high temperature corrosion and fouling of equipments. Carbon Residue Carbon residue indicates the tendency of oil to deposit a carbonaceous solid residue on a hot surface, such as a burner or injection nozzle, when its vaporisable constituents evaporate. Residual oil contain carbon residue ranging from 1 percent or more. Water Content Water content of furnace oil when supplied is normally very low as the product at refinery site is handled hot and maximum limit of 1% is specified in the standard. Water may be present in free or emulsified form and can cause damage to the inside furnace surfaces during combustion especially if it contains dissolved salts. It can also cause splutter- ing of the flame at the burner tip, possibly extinguishing the flame and reducing the flame temperature or lengthening the flame. 1. Fuels and Combustion 3 Bureau of Energy Efficiency
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Typical specification of fuel oil is summarised in the Table 1.2. 1. Fuels and Combustion 4 Bureau of Energy Efficiency TABLE 1.2 TYPICAL SPECIFICATION OF FUEL OILS Properties Furnace Oil LS.H.S. L.D.O. Density (Approx. g/cc at 15°C) 0.89–0.95 0.88–0.98 0.85–0.87 Flash Point (°C) 66 93 66 Pour Point (°C) 20 72 18 G.C.V. (kCal/kg) 10,500 10,600 10,700 Sediment, % Wt. Max. 0.25 0.25 0.1 Sulphur Total, % Wt. Max. Upto 4.0 Upto 0.5 Upto 1.8 Water Content, % Vol. Max. 1.0 1.0 0.25 Ash % Wt. Max. 0.1 0.1 0.02 Storage of Fuel oil It can be potentially hazardous to store furnace oil in barrels. A better practice is to store it in cylindrical tanks, either above or below the ground. Furnace oil, that is delivered, may contain dust, water and other contaminants. The sizing of storage tank facility is very important. A recommended storage estimate is to provide for at least 10 days of normal consumption. Industrial heating fuel storage tanks are generally vertical mild steel tanks mounted above ground. It is prudent for safety and environ- mental reasons to build bund walls around tanks to contain accidental spillages. As a certain amount of settlement of solids and sludge will occur in tanks over time, cleaning should be carried out at regular intervals-annually for heavy fuels and every two years for light fuels. A little care should be taken when oil is decanted from the tanker to storage tank. All leaks from joints, flanges and pipelines must be attended at the earliest. Fuel oil should be free from possible contaminants such as dirt, sludge and water before it is fed to the combustion system. LOSS OF EVEN ONE DROP OF OIL EVERY SECOND CAN COST YOU OVER 4000 LITRES A YEAR Removal of Contaminants Furnace oil arrives at the factory site either in tank lorries by road or by rail. Oil is then decanted into the main storage tank. To prevent contaminants such as rags, cotton waste, loose nuts or bolts or screws entering the system and damaging the pump, coarse strainer of 10 mesh size (not more than 3 holes per linear inch) is positioned on the entry pipe to the storage tanks.
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  • Spring '17
  • Jerome Ramos

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