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Article Number 201610, October 2018
Exhaust Gas Recycling for Enhanced CO2 Capture: Experimental and CFD Studies on a Micro-Gas Turbine
Energy Engineering Group, Mechanical Engineering, University of Sheffield, S10 1TN, UK
2. Energy Technology & Innovation Initiative
Faculty of Engineering, University of Leeds, LS2 9JT, UK
Spanish Research Council, Francisco Pintado Fe 26, 33011 Oviedo, Spain
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Exhaust gas recirculation (EGR) and selective exhaust gas recirculation (S-EGR) are means of augmenting the flue gas CO2 concentration from gas turbines, with the aim of facilitating post-combustion CO2 capture. Gas turbines operate under lean conditions, resulting in flue gases with low CO2 and high O2 concentrations, in large volumetric flows. This negatively affects post- combustion capture and can lead to enhanced oxidative solvent degradation in amine-based systems. Making use of EGR/S-EGR could mitigate these impacts, resulting in energy and cost savings for capture, as well as efficiency improvements in the power plant. The experimental research herein considered various degrees of CO2 enhancement in the flue gas through CO2 injections to the compressor inlet of a highly-instrumented micro-gas turbine. Coupled with computational fluid dynamics (CFD) models, the impacts on turbine performance were assessed, in terms of emissions, temperatures and combustion stability. At low loads, the impacts of EGR/S-EGR were greater – with higher levels of incomplete combustion products (CO and unburned hydrocarbons). It would appear that the presence of more aromatics (unburned species) and, to a lesser degree, the reduced temperatures, also allowed for greater nanoparticle coagulation, significantly changing the size distribution of submicron and especially ultrafine particulates. Moreover, the greater heat capacity of the modified oxidiser (air+CO2) resulted in lower temperatures measured throughout the cycle, which reduced NOx formation. The CFD studies used a steady-state Reynolds-Averaged Navier-Stokes approach to corroborate these findings, with calculated in-flame temperatures up to ~100 K lower under EGR/S-EGR conditions and notable decreases in NOx levels.
CO2 capture; exhaust gas recirculation; flamelet generated manifold; gas turbine.
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Article Number 201609, March 2018
Application of BFG-oxyfuel combustion techniques in a steel reheating furnace
1. Swerea MEFOS
SE-971 25 Luleå, Sweden
2. AGA AB
SE-12530 Älvsjö, Sweden
3. SSAB Special Steels
SE-613 80, Oxelösund, Sweden
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The steel reheating furnace is the most energy consuming process in the rolling mill. Usually fossil fuels with the high heating value, such as coke oven gas (COG), natural gas, liquefied petroleum gas (LPG) or oil, are used for combustion processes to achieve the target slab temperature. The purpose of this paper is to investigate the possibility of using blast furnace gas (BFG) with a low calorific value in the reheating furnace by means of fuel preheating and oxyfuel techniques. This work compares various oxyfuel combustion alternatives, and their influence on the energy balance for the reheating furnace. In addition, a system analysis was performed to investigate the potential influence of these oxyfuel combustion alternatives on the energy consumption and carbon dioxide (CO2) emissions at an integrated steel plant. The economic evaluation is also discussed to some extent.
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Article Number 201608, December 2017
The Impact of Natural Gas Quality on Large-Scale Combustion Processes in Thermal Processing Industries and Power Generation
1. Gas- und Wärme-Institut Essen e. V.
45356 Essen, Germany
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Natural gas plays an important role as a fuel for power generation and industrial manufacturing processes, for residential heating appliances and also as a feedstock for processes in the chemical industries. The share of natural gas in the global primary energy mix is likely to increase even further in the future due to the decline of coal in power generation, as natural gas is the cleanest among the fossil fuels, both in terms of its carbon dioxide footprint, but also in the context of other pollutants such as nitrogen oxides or particulate matter.
Natural gas, golden age of gas, natural gas quality, thermal processing industries, power generation
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