A number of industrial sites have a significant demand for pure steam for their various production processes. Normally this steam is produced in some kind of boiler. The fuel is normally coal, oil or gas, and in rare cases, various biofuels.
Nebb has developed an oxyfuel process for the supply of steam and electric power to industrial processes with up to 100% CO2 capture and no NOx emissions. The process is illustrated in the figure below.
Oxygen and fuel are combusted in a CES gas generator, close to the stoichiometric combustion process. The combustion takes place at high pressure (up to 120 bar), and the resulting gas is composed of approximately 90% H2O and 10% CO2.
The gas mixture is expanded in a steam turbine. The resulting gas is used in a steam generator, where the thermal energy and condensation energy is used to produce steam at the required pressure for the industrial process.
In addition to power and steam, a by-product of the process is pure water.
For smaller facilities, it would be natural to import oxygen and export CO2 by truck. For larger facilities, an Air Separation Unit (ASU) will be required for oxygen production, and the CO2 would need to be exported by pipeline or ship.
If an ASU is used for oxygen production, large amounts of nitrogen and some argon will also be produced as by-products.