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SUMMARY ⑤ Korea Iron & Steel Association

By-product gases: valuable energy source Blue Carbon keeping Earth going

By-product gas is a product generated during steelmaking. Let’s find out how this gas is put to use. Did you know that the world is getting a little warmer every year? That's because of global warming. Is there any solution to
this problem that is only getting worse? Blue carbon. Let's find out what it can do.

They're carefully collected and reused as energy source for the steel mill
By-product gases consist of hydrogen (H2), methane (CH4), and carbon monoxide (CO). These gases generated during the What causes global warming?
iron and steel-making process are reused as energy source for steel mills, or transferred to power plants to generate electricity.
Heavy use of fossil fuels (coal) produces greenhouse gases (carbon dioxide) that cover the Earth. Because heat can't escape
into outer space, Earth’s temperature climbs, resulting in sea level rise and extreme weather and climate change. This is why
36% of by-product gases is reused
the entire world is working together to reduce greenhouse gases that cause global warming.
47% to produce electricity. The CO2
emissions avoided in this process
47% to be reused for power is equivalent to CO2 absorbed by
generation 855 million pine trees in a year. 855 million!? Blue Carbon, the ocean's well-kept gift
from 2020 and onward (estimate)
Scientists and environmentalists around the world have been looking for ways to mitigate carbon in the atmosphere to stave off
36% reused for pow- (11% sold
50% reused for steelmaking er generation (to POSCO global warming. What they discovered was ‘blue carbon,’ found in marine ecosystems such as algae and shellfish. Blue carbon
Energy))
can absorb more carbon from the atmosphere than trees.
※ Source: POSCO’s by-product gas reuse breakdown (2018) 3% sold
(to oth-
ers)
Artificial reefs build sea forests
Filtered to produce hydrogen energy In its effort to restore marine life and prevent further global
warming, POSCO, a Korean steelmaker, is building sea forests
The by-product gas generated at steel mills is filtered to produce ‘hydrogen.’ Hydrogen is often regarded as the ultimate future Coniferous and tropical forests
using ‘triton,’ artificial reefs made from steel by-products. When can absorb carbon for a few
energy source because it is easily obtained by chemical decomposition of water, and is restored to water when consumed by To control global
algae attach to artificial reefs, through photosynthesis, they can hundred years at most; but blue warming, it sounds
binding with oxygen. Hyundai Steel, a South Korean steelmaker, is producing 99.999% pure hydrogen by recycling by-product carbon can soak it up for
absorb 3 to 16 tons of carbon per year/10,000 m². like we need to grow
gas at Dangjin Steelworks. thousands of years. Moreover, forests in the ocean
given the square footage, as well as on land.
Electricity marine life has more absorption
power than forests.
By-
product
gases Fuel cell power plant Electricity

Algae planted in Artificial reefs Seaweeds grow and
Steel mill Hydrogen plant artificial reefs installed under water sea forests flourish

Hydrogen charging Hydrogen Hydrogen EV
A piece of station A piece of
knowledge knowledge

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