Investigation of Energy Efficiency by Making Exergy Analysis in the Cement Sector

Abstract

In Turkey, cement producing is one of the most important sectors in terms of energy consuming and costs. Owing to this reason, using energy efficiently and a decline in energy consumption have an importance in this sector.

This study aims to make energy and exergy analysis of a cement factory in Adana and to realize the cost of energy efficiency, by using the actual operational data. According to energy and exergy analysis, the energy efficiency value for the raw mill is obtained to be 69 % in this study, whereas the exergy efficiency value for that is found to be 11 %.

Nomenclature

E:

Energy (kJ)

$\dot{E}$ :

Energy rate (kW)

Ex:

Exergy (kJ)

$\dot{E}x$ :

Exergy rate (kW)

h:

Specific enthalpy (kJ/kg)

I:

Irreversibility, exergy consumption (kJ)

$\dot{I}$ :

Irreversibility rate, exergy consumption rate (kW)

m:

Mass (kg)

$\dot{m}$ :

Mass flow rate (kg/s)

P:

Pressure (Pa)

Q:

Heat transfer (kJ)

$\dot{Q}$ :

Heat transfer rate (kW)

s:

Specific entropy (kJ/kg K)

$\dot{S}$ :

Entropy rate (kW)

T:

Temperature (K)

W:

Work (kJ)

$\dot{W}$ :

Work rate or power (kW)

η:

Energy (first law) efficiency (%)

ε:

Exergy (second law) efficiency (%)

ψ:

Flow exergy (kJ/kg)

c:

Clay

dest:

Destroyed

d:

Gas dust

f:

Farine

gen:

Generation

g:

Gas

in:

Input

m:

Moisture

l:

Limestone

la:

Leaking air

mc:

Moisture clay

ml:

Moisture limestone

r:

Return from separator

s:

Steam

out:

Outlet, existing

0:

Dead state or reference environment