APPLICATION OF PINCH TECHNOLOGY IN
MINIMISATION OF ENERGY CONSUMPTION
IN CHEMICAL INDUSTRIES
PRESENTERS
NDENGA D.L,ASSOCIATED BATTERY
MANUFACTURERS,NAIROBI AND
KILONZI F.M,MOI UNIVERSITY,ELDORET.
ENVIRONMENT & NEW CONSTITUTION
 In the new constitution Environmental rights have
been elevated to Constitutional /Fundamental
Rights, now enshrined in the Bill of Rights.
 The principle of sustainable development has since
been entrenched in Article 10 2(d) of the
Constitution as one of the National values and
principles of governance.
ENVIRONMENT & NEW CONSTITUTION cont
This paper looks at how Pinch Technology can be used
to reduce;
 Green House Gas Emissions
 Industrial Energy Consumption
PRESENTATION OUTLINE
1.ENVIRONMENT AND NEW CONSTITUTION
2.INTRODUCTION
2. PINCH ANALYSIS CONCEPTS
3. PROCESS HEAT EXCHANGE ANALYSIS
4.COST IMPLICATION OF ENERGY RECOVERY
6. APPLICATION OF PINCH CONCEPT IN CHEMICAL
INDUSTRIES.
INTRODUCTION
 Pinch technology is a process integration technique
and a powerful way to optimize the process design,
yielding results superior than achievable by using
conventional optimization of processes in isolation,
tends to optimize the system (a collection of
interrelated processes and unit operations) as a
whole.
 Application of pinch technology in the Chemical and
Process industry has provided innovative ways to
reduce the energy consumption in Chemical and
Process Industries.
INTRODUCTION
Reduced energy consumption is one of the beneficial
aspects of the pinch technology. Other benefits
include correct integration of steam turbines, cooptimization of energy and capital cost,
identification of the most appropriate process
changes and increased plant flexibility. This
approach provides overall process designs that are
intrinsically environmentally friendly.
PINCH ANALYSIS CONCEPTS
 The majority of process plants contain a number of
streams which need either to be heated or cooled (known
respectively as cold streams and hot streams). It is often
immediately apparent that some of the heating and
cooling can be carried out by heat recovery between one
or more of the hot streams and one or more of the cold
streams. On most of these plants, it is also apparent that
some heating and some cooling are actually being carried
out by thermal utilities, eg process steam, cooling water
etc which results in a net energy cost to the site.
PINCH ANALYSIS CONCEPTS cont:
We should ask ourselves the following questions:
1. What is the maximum amount of heat which can be
recovered, ie what is the minimum amount of (paid for)
heating and/or cooling required?
2.What configuration of heat exchangers between hot
streams and cold streams is required in order to achieve
the maximum amount of heat recovery?
 The Golden rules of PA are
 Don't transfer heat across the pinch;
 Don't use a hot utility below the pinch;
 Don't use a cold utility above the pinch
PROCESS HEAT EXCHANGE ANALYSIS
Heat exchangers work on the principle that heat flows
from high temperature to low temperature( Second
Law of Thermodynamics). If two process streams are
separated by a thermally conducting surface, heat
will flow from the hot stream to the cold stream.
Fig 1
Figure 2 The composite curves for heat integration allows targets for hot and cold
utilities to be set.
COST IMPLICATION OF ENERGY RECOVERY
Fig 3: The trade-off between energy and capital costs gives the optimum ΔTmin
for minimum cost in new designs
PROCESS HEAT EXCHANGE ANALYSIS cont
Pinch is the temperature region in a process where the
hot and cold composites are closest together. It is
therefore the region where heat recovery is most
constrained and it is most important to ensure that
heat transfer duties are correctly configured.
APPLICATION OF PINCH CONCEPT IN
CHEMICAL INDUSTRIES
It can be used for the initial design of the process
2. As a tool to guide process modifications due to
changing circumstances(financial, process or
environmental).
3. Can be used for targeting energy usage in a plant.
4. Used to calculate total annual cost of utilities and
capital cost of heat exchanger network
1.
CONCLUSION
• Pinch Technology can thus be used to Reduce Energy
Consumption in Chemical Industry and Green House
Gas Emissions
THANKYOU FOR YOUR AUDIENCE!!