Boilers

What is the difference between the superheated, cooled and saturated steam?

• Humidity rate

• The energy which could be converts into the heat in at the same pressure

•   Pressure at the same enthalpy.

• Temperature difference

Name the main feature of the heat dynamic equilibrium in boiler operation.

• Constant fuel consumption per hour.

• Constant parameters of generated steam

• Constant feed water consumption.

• Constant number of turbine revolutions

Name the main feature of the material balance in boiler operation.

• Constant fuel consumption per hour.

• Constant steam consumption per hour.

• Constant feed water consumption per hour.

    

• Constant water level in the boiler.

On which heating surface of the boiler does heat transfer take place at the highest gas temperature?

• In the superheater.

• On steam generating surface.

• In the economizer.

• In the airheater

On which heating surface of the boiler does heat transfer take place at the highest metal temperature?

• On steam generating surface.

• In the economizer.

• In the airheater.

• In the superheater.

   

In what places of the boiler do we see damaging effect of the vanadium in the fuel oil?

• In superheaters at high metal temperature

• In airheaters at low metal temperature.

• At presence of water due to tube leakages.

• At presence of water from atmosphere when boiler doesn`t operate.

   

For what purpose should you know the specific gravity of fuel?

• To determine the grade of fuel oil.

• To recalculate the tank volumes into weight units.

• To determine the temperature of heating for pumping.

• To determine the temperature of heating before atomization.

What feature determines the grade of fuel oil?

• Heating value.

• Sulphur content.

• Viscosity.

• Ash content.

What is the function of separators in the system?

• To remove sulphur.

• To remove mechanical impurities

• To remove water and mechanical impurities.

• To decrease heavy fuel oil viscosity

For what purpose is the fuel atomized before the furnace?

• For increasing activity surface

• For complete, thorough mixture with air.

• For increasing fuel heating.