Abstract
Greenhouse gases emissions represent a first-degree concern in power generation from fossil fuels combustion. Over the past two
and a half centuries, since the dawn of the industrial era, huge amounts of carbon dioxide have been released into the atmosphere
from combustion processes, most of it coming from fossil fuel-fired power plants. The effects of CO2 accumulation in the
atmospheric environment become more and more apparent due to the increasingly strong greenhouse effect leading to global
warming. One of the leading carbon dioxide emissions reduction techniques is CO2 sequestration by means of oxycombustion.
The present paper deals with the calculus of a new boiler’s heat transfer surface areas of the furnace, superheater, and economizer
sections of the water-vapor path in the case of pure oxygen as oxidizer, for CO2 sequestration. The aim is to determine the
decrease of the necessary heat transfer surface area and thus to show that 100% oxygen contents in the oxidizer leads to a more
compact boiler. A comparison is performed in terms of heat transfer surface areas between an existing natural gas-fired
supercritical boiler retrofitted for oxycombustion and the new oxycombustion boiler resulting from the computational model that
we have developed. The comparison involves two situations: with or without an imposed temperature of the oxidizer after the air
preheater.