Project Profile: In 2012, the NOX emission limit standard of gas turbine power plant was reduced from 100mg/m3 to 50 mg/m3, Shenzhen Nantian Power Plant upgraded the water injection combustion system of PG9171E gas turbine to dry low nitrogen combustion system (DLN) to meet the NOX emission requirement. NTPS took over the installation and commissioning work of the DLN conversion project. Within 25 days of intensive construction, the DLN conversion work was finished and the gas turbine NOX emission was reduced within 30mg/m3 which is superior to the environmental protection emission standard.