FUELS AND COMBUSTION QUIZ

Winkler process

Kopper-Totzek process

All of these

Lurgi process

Maintaining proper draft in the furnace

Using low c.v. fuels

Oxygen enrichment of combustion air

Controlling the excess air

Inadequate ventilation

Low temperature oxidation

Storage in large heaps with small surface to volume ratio

All of these

Larger quantity of coal can be processed

Coking coals cannot be used

Low carbon conversion efficiency is achieved

Entrainment of solids is higher

None of these

Decreases

Increases

Remains constant

Pulverised fuel can be completely burnt with less percentage of excess air compared to lump coal

Low grade coal can be used, but generally high volatile matter coals are more suitable for making pulverised fuel

None of these

Regulation of furnace temperature and atmosphere (oxidising or reducing) is easily possible with pulverised fuel firing

15-30

43832

70-100

150-200

Oxygen content progressively decreases

Ratio of fixed carbon to volatile matter increases

Calorific value of the coal increases

High rank coals have higher amount of volatile matter

H₂

N₂

CO₂

CH₄

Burns completely

None of these

Gives smokeless burning

Shows little or no fusing action