The results prove that a reduction of the flue gas recirculation rate in oxyfuel natural gas combustion from 70% down to 50% is possible while avoiding inadmissible high flame temperatures with the concept of Controlled Staging with Non-stoichiometric Burners.
The reason attributed to this achievement is increased retention time of flue gases, reduction in temperature of the exhaust gases and rapid turbulence in exhaust pipe.
In spite of a consistent reduction of PCDD/Fs in the flue gas treatment system (from 77% up to 98%), the limit of 0.1 ng ITEQ Nm−3 at the stack was not accomplished.
In this work, the performance of a novel Staged, Pressurized Oxy-Combustion (SPOC) process is presented, which has the potential of increasing plant efficiency even further via reduction of auxiliary loads associated with flue gas recycle and flue gas cleanup.
However, it is also quantitatively observed that the significance of boundary layer reaction reduces notably with the reduction of oxygen concentration in the flue gas, operational pressure and film thickness.
The demonstration problems compare detailed and reduced chemical kinetic calculations for methane air combustion, including nitrogen oxide (NOx) formation, in a stirred reactor and selective non-catalytic reduction of NOx in coal combustion flue gas.
Inorganic microporous membranes show great potential in several important applications, e.g., H2 separation, the recovery of CO2 from natural gas and the reduction of green-house gas emission from flue gas.
For the selective catalytic reduction of NOx by NH3 in the flue gas from a coal fired boiler the reactor technology is explained in terms of reaction mechanisms and formulas describing the reactor operation.
Carbon capture by physical adsorption can strongly participate in the reduction of the carbon dioxide emissions from the flue gases with minimum energy penalties.
The use of flue gases waste energy to recycle flue gases heating up, oxygen preheating and increasing temperature of feedwater to steam cycle has been proposed to surpass the efficiency reduction.
