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Analysis of main gaseous emissions of heavy duty gas turbines burning several syngas - radio - 10-04-2017 abstract This work presents the development of a simple analytical model of performance for heavy duty gas turbine combustors and its use for the analysis of main emissions for a set of syngas fuels. This set of syngas fuels has been selected as a wide representation of different compositions of syngas fuels, from fossil or vegetal origins. Their combustion processes have been modelled as a set of chemical reactors in serial and a detailed kinetic model, simulating a conventional diffusion flame combustor. In each slice, the thermodynamics and the kinetics have been modelled using perfect stirred reactor models. The combustor model has been validated with the GE MS7001F gas turbine experimental data. From this validation the model applicability range has been established for combustor outlet temperatures above 1200 K. Finally the combustor model has been applied to the comparison of different syngas fuels emissions in three new generation gas turbines. 1. Introduction The traditional fuel prices oscillations and their geographic distribution, is making that the use of fuels with alternative origins, as those generated from renewable sources or from more abundant fossil sources, is increasingly considered [1]. Hydrogen rich fuels being available the second step of the process is related to gas turbines engineering since this is the equipment where these fuels are to be burnt. Among all its components, fuel injectors and combustor are those that need to be modified more due to the higher mass flows required to achieve similar rated power [2 4], with a lot of work to be done at the turbine redesign as well to adapt it to the higher mass flows[3]. Gas turbines manufacturers are committed in the development of engines capable of burning hydrogen rich fuel as efficiently and reliably as possible and most of them are running specific programmes for it: Siemens [5,6], General Electric [7,8], Mitsubishi Heavy Industries [9] and Alstom [10], adapting their gas turbines to fuels from variable origins [1], and with pilot plants in different localizations [11] (Table 1). Under the denomination of synthetic gas (syngas) fuels, mixtures of gases with different fractions of hydrogen, methane, carbon monoxide, carbon dioxide and hydrocarbons are considered. Main differences compared with the gas natural as fuel are associated to their composition. The combustible and inert gases mixture, hydrogen and methane, have quite different LHV (Low Heat Value) and transport properties. Also the high percentage of inert gases, like CO2, diminishes the LHV of the mixture and constrains the kinetic of the combustion, mainly because of the heat capacity increase of the syngas and therefore the decrease of the maximum attainable combustion temperature. Through thismechanismthe reaction rate and combustion products are also affected. For this reason they are usually classified as Low Caloric Value Fuels (LCV) [1,4]. Gas turbines are primarily designed to be fuelledwith natural gas, the use of syngases as fuel will present two main redesign challenges [12]: different combustion characteristics. higher volumetric and mass flow rates of fuel gases through the gas turbine combustor and turbine. Recent designs of gas turbine combustors use lean-premix combustion technology to avoid hot spots in the combustor; however syngas fuels cannot be directly used in natural gas lean-premixed combustors designs due to the combined effect of the shorter autoignition delay and faster flame speed of hydrogen. This combination produces an unacceptable risk of the combustion flame propagating upstream, or flashing back, into the lean-premix zone [12], under these considerations, premixing becomes a very questionable practice [3]. So, in a first step of the design, the gas turbines adapted for syngas fuel would use single-stage diffusion combustors featured in older gas turbine designs until lean-premix combustors for syngas fuels are developed. This work is focused on the simulation of the reaction mechanisms with reactants from syngas fuels to predict the main gaseous emissions in heavy duty gas turbines. It presents the development of an analytical model of performance for heavy duty gas turbine combustors Download full report http://googleurl?sa=t&source=web&cd=1&ved=0CDUQFjAA&url=http%3A%2F%2Fsciencedirect.com%2Fscience%2Farticle%2Fpii%2FS037838201000086X&ei=NgsxTqm-DMKtsAK9-tyCCw&usg=AFQjCNEIE-ZA4BE-MEzLwvH-WnlhAu1Z7A&sig2=P7DWszwu5NfJB_ZIrhQ7Pg |