Question
a.
it is abrasive to the coal pulveriser (ie.g. 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).
Posted under Fuels and Combustion Basic Chemical Engineering
Interact with the Community - Share Your Thoughts
Uncertain About the Answer? Seek Clarification Here.
Understand the Explanation? Include it Here.
Q. A coal with high ash content is undesirable, as
Similar Questions
Explore Relevant Multiple Choice Questions (MCQs)
Q. Presence of free moisture in coal during its high temperature carbonisation
View solution
Q. Higher efficiency in the combustion of solid fuel can not be achieved by
View solution
Q. A coal containing very high percentage of durain is called __________ coal.
View solution
Q. During combustion of gaseous fuels, deficiency of air
View solution
Q. Gross and net calorific value of a fuel will be the same
View solution
Q. Low temperature carbonisation
View solution
Q. Gray King Assay and Swelling Index of a coal is a measure of its
View solution
Q. Explosion limit of blast furnace gas is 37 to 71% gas in gas-air mixture. It means that the blast furnace gas will explode when burnt in a confined space, if its concentration in the gas-air mixture is __________ percent.
View solution
Q. Prime coking coal is always blended with medium or non- coking coal before ear-bonisation
View solution
Q. Actual flame temperature is always lower than the adiabatic flame temperature, because there is
View solution
Q. Coke oven gas consists mainly of
View solution
Q. Quantity of coke oven gas produced by high temperature carbonisation of one ton of dry coal may be around __________ Nm³ .
View solution
Q. Coking coals are invariably
View solution
Q. Which of the following accounts for maximum energy loss in a boiler ?
View solution
Q. 'Fuel' can be defined as a substance which produces heat by
View solution
Q. Washing of coal
View solution
Q. Which of the following is not a manufactured fuel ?
View solution
Q. Coke oven gas constitutes mainly of
View solution
Q. Gross heating value of coal is __________ the net heating value.
View solution
Q. Which of the following is a rich fuel gas ?
View solution
Recommended Subjects
Are you eager to expand your knowledge beyond Basic Chemical Engineering? We've handpicked a range of related categories that you might find intriguing.
Click on the categories below to discover a wealth of MCQs and enrich your understanding of various subjects. Happy exploring!
