Session: 04-06 High Hydrogen II

Paper Number: 123631

123631 - Experimental Study of Natural Gas and Hydrogen Co-Firing Characteristics Using Different Types of Single Nozzles of F-Class Practical Gas Turbine Combustors 

Recently, research through the co-firing of natural gas and hydrogen, a carbon-free clean fuel, is attracting attention because to reduce greenhouse gas emissions from aging gas turbine power generation is the biggest energy issue. This can enhance the availability of old gas turbines and contribute stably to an increase in the proportion of combined cycle power plant following the gradual shutdown of coal-fired power plants in Korea. The purpose of this study is to find the optimal operating conditions by mixing fuels without hardware modification of the F-class gas turbine combustor. The experiment was performed according to the load and the co-firing rate using six different types of fuel nozzles (F-Class DLN combustors), and the flame characteristics according to the change in conditions could be analyzed. Co-firing test was performed with natural gas and hydrogen. The test cases were selected based on the actual operating conditions from 30% to 100% thermal load and the hydrogen co-fired with natural gas up to 100% at each load. The OH high-speed imaging tool and OH-PLIF technique were used to analyze the flame structure, and flame characteristics of co-fired flame in detail. In addition, dynamic pressure to check the combustion instability and exhaust gas emissions were measured to evaluate combustion characteristics of co-fired flame. Major findings are critical co-firing rates of each nozzle based on NOx emission level and combustion dynamics. As the hydrogen co-firing rate increased, the flame length decreased compared to natural gas combustion, and it was confirmed that NOx increased rapidly according to the co-firing rate over about 30%vol. In addition, the stability of dynamic pressure for each nozzle was confirmed as the hydrogen co-firing rate increased. Through this study, it was possible to derive the characteristic operation map of a single nozzle according to the hydrogen co-firing rate.

Presenting Author: Sanghyup Lee KEPCO Research Institute

Presenting Author Biography: ~2015. Ph.D in Mechanical Engineering (Combustion)
~2016. Senior Researcher in LG corp.
~Current. KEPCO Research Institute, Carbon-Free Generation Group, Senior Researcher(PM)

Authors:

Sanghyup Lee KEPCO Research Institute
Jungkeuk Park KEPCO Research Institute
Seik Park KEPCO Research Institute
Nakjeong Choi KEPCO Research Institute
Jugon Shin KEPCO Research Institute