Abstract: Abstract:The structure improvement and performance optimization of the gas turbine LM2500+G4 were introduced. The advanced drytype low emission technology was expounded. The advantages of the combined cooling heating and power (CCHP) system in energy saving and environment protection were analyzed. The analysis result shows that to develop the natural gasfired combined cooling heating and power (CCHP) system is very necessary.

Key words: Key words:gas turbine LM2500+G4, combined cooling heating and power (CCHP), drytype low emission technology, energy saving and environment protecting