Steelmaking furnaces operate at about 1600oC — too hot for most sensors. This means there is no way to monitor in detail what is happening inside the furnace, which can lead to inefficiency. Blast furnaces work by using oxygen to remove carbon from pig iron; the gas is injected into the furnace, where it oxidises the carbon in the metal. This produces carbon monoxide and carbon dioxide. But once the carbon is exhausted, the iron itself starts to burn.
A new type of high-temperature sensor could help increase the efficiency of steelmaking furnaces and reduce greenhouse gas emissions, according to its developers at the
Research leader Murray Thomson said about half of the energy used in the process is wasted and generates unnecessary carbon dioxide emissions. ‘If they knew what the CO2 and CO levels were, they could stop the oxygen injection as soon as the carbon oxide levels disappear,’ he said.
Thomson and his combustion group at
The sensor allows the researchers to detect a change in CO2 or CO levels within five seconds, which would allow furnace operators to switch off oxygen injection before the iron started to burn.