CO2-enhanced and humidified operation of a micro-gas turbine for carbon capture

JOURNAL OF CLEANER PRODUCTION

卷:176

Article

Best, Thom¹  Finney, Karen N.²  Ingham, Derek B.²  Pourkashanian, Mohamed² 

[1] Univ Leeds, Fac Engn, Energy Technol & Innovat Initiat, Leeds LS2 9JT, W Yorkshire, England

[2] Univ Sheffield, Mech Engn, Energy 2050, Sheffield S10 1TN, S Yorkshire, England

关键词: Gas turbine;    CO2 emissions;    Exhaust gas recirculation;    Humidified air turbine;    Post-combustion carbon capture;   

DOI  :  10.1016/j.jclepro.2017.12.062

来源: Elsevier

【 摘 要 】

As greenhouse gas emissions are a key driver of climate change, sources of CO2 must be mitigated, particularly from carbon-intensive sectors, like power production. Natural gas provides an increasingly large percentage of electricity; however its lower carbon intensity is insufficient to make proportional reduction contributions to circumvent 2 degrees C global warming. The low partial pressure of CO2 in its flue gas makes post-combustion capture more challenging increasing the CO2 in the exhaust assists in enhancing capture efficiency. This paper experimentally investigates the impact of the combination of humidified air turbines and exhaust gas recirculation to increase CO2 partial pressures, with the aim of evaluating their effects on emissions and turbine parameters at various turndown ratios. It was found that CO2 levels could be increased from 1.5 to 5.3 vol%, meaning more efficient post-combustion capture would be possible. CO2 and steam additions increased incomplete combustion when used together at high levels for low turndown ratios (below 60%), with CO increasing from 49 to 211 ppm and CH4 from 2.5 to 52 ppm; this effect was negated at higher power outputs. Turbine cycle humidification resulted in net improvements to the turbine efficiency, by up to 5.5% on a specific fuel consumption basis. (C) 2017 Elsevier Ltd. All rights reserved.

【 授权许可】

Free