01-03-2011, 03:32 PM
presented by:
R. DHANDAYUTHABANI
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HYDROGEN ENERGY SYSTEM
WHY HYDROGEN ?
Potentially an inexhaustible supply of energy
Can be produced from several primary energy sources
Reduced dependence on petroleum imports if produced from coal or renewables
Potential environmental benefits
High energy conversion efficiency by use of H2 in Fuel Cells(UPTO 90%) in place of I.C. engines (30-35%)
Efficiency is high.Because no fuel is burned to make energy, fuel cells are fundamentally more efficient than combustion systems
Properties of Hydrogen
Hydrogen gas is highly flammable
It will burn in air at a very wide range of concentrations b/w 4% and 75% by volume
Heating value - 12.1 MJ/cu m
Less dense
Hydrogen is a secondary energy resource, meaning it must be made from another fuel.
Science of Hydrogen Fuel Cells
Two electrode ( cathode and anode) surrounds an electrolyte.
Catalyst – platinum.(oxidization)
It produce electrons and protons.
Electrons – Produce electric energy.
Protons combines with oxygen and produces water.
Science of Hydrogen fuel cells
Basic Issue.
Production
Storage
Transportation
Utilization
Safety and management
Economy
Production of Hydrogen
Hydrogen can be produced from a wide variety of energy resources including:
Fossil fuels, such as natural gas and coal
Nuclear energy
Renewable resources, such as solar,water, wind and biomass
Types of h2 processes
categories of Hydrogen production
Electrolysis process
Thermal – chemical process
Fossil- fuel Process
Photo- electrolysis process
Electrolysis Process
Defintion of Electrolysis:
* A chemical process in which bonded
elements and compounds are dissociated by the passage of electric current.
Example:
Electrolysis of water
2H2O + energy = 2H2 + 2O2