by 1.What is meant by furnace or fired heater in a process industry?
- a device used to heat up chemicals or chemical mixtures
2.Name the important fuels used in the furnace.
- Natural gas, methane, ethane, propane, or fuel oil
3.Name the main process responsible for heat transfer in furnace. Write its percentage.
- Radiant heat transfer
- 60 to70%
4.What is meant by calorific value ( heating value ) of a fuel . Write its unit.
- The heat energy released by1Kg or 1m3 of fuel
- KJ/m3 or Btu/m3
5.Name any 4 important parts of a furnace .
- Firebox, radiant tubes or coils, convection tubes and damper
6. What is the purpose of Peep holes in furnace.
- Allow for visual inspection by the operator inside the furnace
7.What is meant by Bridge wall section in a furnace .
- The wall that separates the various sections in the firebox
8.What is meant by Radiant section in a furnace. Where it is located?.
- The tubes located along the walls of the firebox are called the radiant tubes or coils. Radiant tubes receive direct heat from the burners.
9.What is meant by Convective section in a furnace. Where it is located?
- Convection tubes are located in the roof of the furnace and are not in direct contact with burner flames. Hot gases transfer heat through the metal tubes and into the charge
10.What is meant by Draft in furnace. Write its 3 types.
- Negative pressure of hot air and gas at different elevations in a furnace
11.Write the 3 different types of furnace. Which furnace is more efficient?
- Cabin furnace (more efficient)
- Cylindrical furnace
- Box furnace
12.Which furnace is most popular in chemical process industries.
- Cylindrical furnace
13. What is the drawback of a cylindrical furnace.
- have a lower efficiency due to high stack temperatures
14. Name the 4 factors which affects the performance of a furnace efficiency.
- furnace efficiency
- flame impingement
- hot spot
- avoid fuel composition changes
15.What is meant by Flame impingement in furnace?
- Frequent contact
