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Hydrogen cycle/Power to gas

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Adrienn Wilhelm

on 5 June 2013

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Transcript of Hydrogen cycle/Power to gas

The Hydrogen cycle/
Power to gas Sustainable energy economics SoSe2013 What is hydrogen? What is hydrogen cycle? An Idealized Hydrogen Cycle
Step 1 An Idealized Hydrogen Cycle
Step 3 An Idealized Hydrogen Cycle
Step 4 An Idealized Hydrogen Cycle
Step 2 ...and how does it look like Is a naturally occurring gas that is amazingly light, in the fact the lightest gas ever found. Has no color, no smell and no taste. Hydrogen is the most important and abundant substance in the universe. The hydrogen cycle is simply the water cycle.This cycle is all about how water is recycled throughout the planet. Water is split into hydrogen and oxygen by the process of electrolysis, using electricity generated from renewable energy sources The oxygen is released into the atmosphere, whilst the hydrogen is stored and transported Oxygen from the atmosphere is re-combined with the stored hydrogen in a fuel cell, producing electricity and water vapur The water vapor is released back into the environment, where it can become part of the cycle once again How can hydrogen be produced? - It can be produced by passing steam over heated carbon
- When heated natural gas decomposes into hydrogen
- It also can be produced by electrolysises of water Is it renewable? - It can be renewable
- If you use renewable source such as, solar or wind it will create electrolysis. The seperated hydrogen will then be stored
- It combines with oxygen to generate electricity and releases heat and water
- Water, oxygen and hydrogen create endless cycle of energy Collection and Distribution Advantages Disadvantages - There is a cheap and efficient way to distribute hydrogen
- Sending hydrogen through pipelines is the cheapest way to deliver high volumes of hydrogen - Hydrogen can be transported in a liquid form by tankers or as compressed gas by trailers
- This requires more round trips because a 44 ton vehicle carries enough gasoline to refuel 800 cars, but only enough hydrogen to fuel 80. Hydrogen itself thus contributes in a first approximation neither to energy supplies nor to climate protection. It is produced from renewable energy sources it is about as a secure to supply and as climatically natural as electric power from renewable energies. This assumes that recent suspicions are not confirmed according to which hydrogen escapes through leaks could itself contribute to the greenhouse effect in the upper atmospheric strata. Power to gas The conversion of renewable power into gas. What is P2G? P2G/ Step1
Electrolysis - Excess power is converted into hydrogen
- Methanisation { synthetic methane is obtained from hydrogen and carbon dioxide (CO2) } P2G/ Step 2
Microorganisms convert power into methane - Convert hydrogen and carbon into pure methane- The microorganisms function at ambient pressure and temperature, and there are no special requirements
- Held in a gas storage facility and converted into electricity / injected directly into the natural gas grid P2G/ Step 3
Linking the power and natural gas grids - Via combined heat and power stations
- This link between the electricity grid and natural gas grids is an important condition for the successful transition from conventional to renewable fuels Plans in Germany - to clean up the country's energy systems
- to slash CO2 emissions by replacing fossil fuels with renewable sources of energy
- 35% of its electricity from green sources by 2020
- by 2050, the share is expected to surpass 80%
- cut its greenhouse-gas emissions by 40% below 1990 production levels by 2020 “Germany's Energiewende can mobilize a global energy revolution,” Benefits of P2G • Transporting energy via a gas pipeline is several times less expensive than transporting electricity
• The ability to perform fast regulation services
• Improved utilization of existing generating assets
• Ability to perform energy time arbitrage
• Ability to perform energy spatial arbitrage
• Offset of new electrical transmission requirements
• Increased grid flexibility
• Infrastructure for energy transmission, storage and distribution immediately available Associated Problems - Degree of efficiency
- Costs (6-8 cents per kWh)
- Regulatory framework
- 5% maximum of hydrogen in pipelines due to the “Gas Network-Access Regulation
- Renewable Energy Law

Power to gas is in early stages Adrienn Wilhelm Why is the hydrogen important? In the future hydrogen will be available at lower cost and in larger amount than the hydrogen carbons petroleum and natural gas, which will become scarcer in the future.
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