Question 1 - Decarbonisation Gas Networks Flashcards
Q1A) Why does NI use a gas supply network and with what type of gases are involved.
The NI gas network is the most modern gas network in the UK. The majority of the gas for NI and Ireland comes from GB through the north sea and from imports.
Natural gas is a key energy source used for heating, cooking, and powering various appliances. The gas supply network consists of pipelines that transport natural gas from the point of entry into the country to different regions and, ultimately, to individual consumers.
Having a gas supply is NI has both short and long term benefits.
Short Term
Provides a cheaper form of fossil fuel, gas is cheaper than coal and oil
It also produces less GHG emissions compared to the other Fossil fuels
Long term
The gas network is made up of polyethylene plastic (PE100) which allows the supply of other gases other than natural gas. Biomethane, blue and green hydrogen can be supplied through the network. Carbon capture and storage can also be utilised.
Q1B) Biogas Slurry Calculation - How much gas can be produce, what type of gas and the energy yield of biogas
Biogas m3/t for cattle is around 22.
11 Million Tonnes/year in NI
22 x 11,000,000 tonnes = 242,000,000 m3 gas
Calorific Value = 20 MJ/kg
Density = 0.6 kg/m3
20 * 0.6 = 12 MJ/m3
242,000,000 x 12 = 2,904,000,000 MJ of Biomass
21,600,000,000 MJ = 13% of NI needs
1000,000,0 MJ = 2.7777777778 gWh
So convert if required
Q1C) If NI has 7248 GWh of Natural gas use, if there is 11 million tonne of slurry, how much natural gas can be displaced ? - Anaerobic Digestion
11,000,000 tonne of slurry
Q1D) What other sources of biomass can we use to help decarbonise ,
One or two paragraphs
Food waste
Energy Crops
Agricultural straw and crop residues however this will impact the farming of foods
The debate of growing food or fuel
If question is just about general decarbonisation then the following can be expanded on
Hydrogen
CCUS
Electronification
