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Fuels and Combustion

Dust content in raw blast furnace gas is about _______________ gm/Nm3; hence it is cleaned to the dust level of about < 10 mg /Nm3 before use?

Fuels and Combustion /
Dust content in raw blast furnace gas is about _______________ gm/Nm3; hence it is cleaned to the dust level of about < 10 mg /Nm3 before use?

A. 15-30
B. 1-2
C. 70-100
D. 150-200

Dust content in raw blast furnace gas is about _______________ gm/Nm3; hence it is cleaned to the dust level of about < 10 mg /Nm3 before use? Read More »

Fuels and Combustion

When steam is passed over coal resulting in the endothermic reaction represent by, C + H2O = CO + H2, it is called the _______________ of coal?

Fuels and Combustion /
When steam is passed over coal resulting in the endothermic reaction represent by, C + H2O = CO + H2, it is called the _______________ of coal?

A. Carbonisation
B. Oxidation
C. Coalification
D. Gasification

When steam is passed over coal resulting in the endothermic reaction represent by, C + H2O = CO + H2, it is called the _______________ of coal? Read More »

Fuels and Combustion

A coal with high ash content is undesirable, as________________?

Fuels and Combustion /
A coal with high ash content is undesirable, as________________?

A. It is abrasive to the coal pulveriser (i.e. ball mill) and the combustion chamber
B. The ash in molten condition gets absorbed in the pores of the refractory lining of the furnace
and causes its spalling due to different co-efficient of expansion/contraction of the refractory
and the ash
C. The ash retains the sulphur & phosphorus and thus affects the quality of products in
metallurgical furnace apart from increasing the slag volume. Besides, it may fuse and stick to
the boiler tubes thereby reducing the heat transfer
D. All A., B. and C.

A coal with high ash content is undesirable, as________________? Read More »

Fuels and Combustion

Which of the following accentuates clinkering trouble on furnace grate burning coal ?

Fuels and Combustion /
Which of the following accentuates clinkering trouble on furnace grate burning coal ?

A. Low reactivity of carbonised residue containing high proportions of iron & sulphur
B. Low forced draught and fuel bed temperature
C. Thick fire bed and preheated primary air
D. All A., B. and C.

Which of the following accentuates clinkering trouble on furnace grate burning coal ? Read More »

Fuels and Combustion