CRO Prep 2024 Exam Questions & Answers 100% CORRECT
What are the "Big Four" parameters for kiln control? (Name at least 3) - ANSWERSFeed, Fuel, Fan, Speed
Describe why higher kiln amps is associated with hotter thermal conditions inside the kiln. - ANSWERS§ By adding fuel à kiln temperatu...
What are the "Big Four" parameters for kiln control? (Name at least 3) - ANSWERSFeed, Fuel, Fan, Speed
Describe why higher kiln amps is associated with hotter thermal conditions inside the kiln. - ANSWERS§
By adding fuel à kiln temperature rises à material nodules formation à affecting Kiln Amps.
§ Nodules stick more to kiln walls "climbing" higher, increasing amps
§ Main drive effort to rotate kiln, and energy consumption are reduced.
What factors affect the Kiln's filling degree? (Hint: Refer to the equation reproduced below) - ANSWERSa.
Kiln Speed
b. Kiln feed rate
c. Inclination Angle
d. Kiln Diameter
Fuel is one of the main four control parameters of the pyroprocess system. Name at least 3 control
variables associated with this parameter. - ANSWERSa. Oxygen
b. Nox
c. Kiln Amps
d. Hot Stage Temperature /Calcination
e. Burning Zone Temperature
f. Evaporations
Feed is one of the main four control parameters of the pyroprocess system. Name at least 3 control
variables associated with this parameter. - ANSWERSa. Free lime
b. BZ temperature
c. Kiln Amps
d. PH Temperatures
, e. Yield
Kiln Speed is one of the critical control parameters. Name the 2 control variables associated with kiln
speed. - ANSWERSa. Filling Degree
b. Residence TIme
Draft (Fan) is one of the critical control parameters. Name the 3 control variables associated with Draft. -
ANSWERSa. Oxygen
b. PH Temp Profile
c. PH Exit Presure
d. BZ Temperature
e. NOx
f. Inleakage
g. Evaporations
h. Flame Length/Shape and Temperature
The Ideal range for free lime in clinker is 2.0%-2.5%. - ANSWERSTrue
How is secondary air temperature affected by clinker bed depth? - ANSWERSThe thicker the clinker bed,
higher the secondary air temperature
If you have less feed in the kiln (no change to fuel), will there be more or less heat available in the
system? What will happen to the Free Lime value? - ANSWERSMore heat available, lower Free Lime
value
What conditions (Name at least 3) can indicate signs of overheating? - ANSWERSa. MgO spikes in clinker
b. Low Free Lime
c. High evaporations
d. Low inlet O2
e. Hot spot formation
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