Natural Gas-Oxygen Combustion in a Super-Critical Carbon Dioxide Gas Turbine Combustor

Abstract

<jats:p>The paper presents results for chemical kinetics of combustion process in the combustor of oxy-fuel cycle super-critical carbon dioxide gas turbine based on the Allam thermodynamic cycle. The work shows deviation of the normal flame propagation velocity for the case of transition from the traditional natural gas combustion in the N2 diluent environment to the combustion at super-high pressure up to 300 bar in CO2 diluent. The chemical kinetics parametric study involved the Chemkin code with the GRI-Mesh 3.0 kinetic mechanism. This mechanism provides good correspondence between calculation results and test data. The CO2 and N2 diluents temperature, pressure and contents influence the flame propagation velocity and the chemical kinetics parameters in the two gas turbine types. It is demonstrated that the CO2 diluent slows down chemical reactions stronger than the N2 one. The flame propagation velocity in carbon dioxide is four time smaller than in the N2 one. In the oxy-fuel cycle combustor a pressure increase reduces the flame propagation velocity. Increase of the CO2 content from 60 to 79% reduces the flame propagation velocity for 65% at atmospheric pressure and for 94% at super-critical pressure. An increase of the combustor inlet mixture temperature from 300 to 1100 K at super-critical pressure causes the flame propagation velocity increase for 94%. The flame propagation velocities compatible with the traditional gas turbines may be reached at the CO2 diluent content of the O2 + CO2 mixture in the active combustion zone must be below 50%.</jats:p>

Promising areas of industrial production decarbonization with a high component carbon footprint in manufactured products

“…In a recuperative heat exchanger, the recirculation stream is reheated from the hot gases leaving the turbine and enters the combustion chamber at a temperature level of over 700°C. Excess carbon dioxide generated in a semi-closed cycle is sent for recycling [5].…”

Study of the coolant type influence on the thermal and hydraulic characteristics of cooling channels for high-temperature turbine blades in an oxy-fuel energy system

“…The most efficient OFES plant is based on the Allam cycle. The efficiency of reducing CO 2 emissions from these plants reaches 99% [6][7] with a net efficiency of 50%. It has been proven that the highest efficiency of an OFES using the Allam cycle is achieved at initial parameters equal to 1100 °C and 30 MPa [8][9].…”

Archives of Thermodynamics

“…The post-combustion technology may employ the membrane [13][14][15] or cryogenic [16,17] separation, or the oxy-fuel combustion capture [18][19][20], or the chemical looping combustion [21][22][23][24], or the chemical reagent absorption like in the pre-combustion capture technology. These technologies may be used for modification of the existing steam turbine and combined cycle power plants, or the new TPP construction.…”