Chapter 5, Problem 3Q

(a)

Interpretation Introduction

Interpretation:

For a coal-fired power plant, it has to be determined that where would the coal appear in the given figure which depicts the components of an electric power plant.

Concept Introduction:

A fuel is a substance which releases energy in the form of heat while undergoing combustion. Hydrocarbons which have high heats of combustion make it a best fuel.

The general equation for the complete combustion of a hydrocarbon is written below,

${\text{\_ C}}_{\text{x}}{\text{H}}_{\text{y}}\text{+}{\text{\_ O}}_{\text{2}}\to \text{\_}{\text{CO}}_{\text{2}}\text{+}\text{\_}{\text{H}}_{\text{2}}\text{O}$

Coal is a good fuel becouse it is completely made up of carbon atoms. It is a fossil fuel.

Coals can be classified and graded according to the carbon percent and the impurity percent such as sulfur.

Anthracite coal has high carbon content.

(b)

Interpretation Introduction

Interpretation:

Water is a part of two separate loops in the given figure of coal electric power plant. One loop connects the boiler and turbine and is usually under pressure. The reason behind this has to be given.

Concept Introduction:

A fuel is a substance which releases energy in the form of heat while undergoing combustion. Hydrocarbons which have high heats of combustion make it a best fuel.

The general equation for the complete combustion of a hydrocarbon is written below,

${\text{\_ C}}_{\text{x}}{\text{H}}_{\text{y}}\text{+}{\text{\_ O}}_{\text{2}}\to \text{\_}{\text{CO}}_{\text{2}}\text{+}\text{\_}{\text{H}}_{\text{2}}\text{O}$

Coal is a good fuel becouse it is completely made up of carbon atoms. It is a fossil fuel.

Coals can be classified and graded according to the carbon percent and the impurity percent such as sulfur.

Anthracite coal has high carbon content.

(c)

Interpretation Introduction

Interpretation:

Another loop in the given representation of coal electric power generator brings in (and out) water from a lake or river. Here large body of water is needed. The reason behind this has to be given.

Concept Introduction:

Heat of combustion: It is also known as potential heat of fuel. Heat of combustion of carbon depends on its allotropic form.

A fuel is a substance which releases energy in the form of heat while undergoing combustion. Hydrocarbons which have high heats of combustion make it a best fuel.

Coal is a good fuel becouse it is completely made up of carbon atoms. It is a fossil fuel.

Coals can be classified and graded according to the carbon percent and the impurity percent such as sulfur.