The electrical energy is converted into mechanical energy in the long term continuous operation of air compressor in thermal power plant. The air is strongly compressed in the process

and the temperature increases greatly

and should be cooled through the cooling system before storage. If this part of the energy is recovered

it can help enterprises to save energy consumption and create good economic

environmental and social effects. In this paper

the scheme of the waste heat utilization of air compressor is designed

and the heat recovery of the compressed air system of six 250kW units in Qing He plant is carried out

the reclaimed heat is used to heat domestic water. The economic analysis is also carried out related to the project. It is shown that the payback period of the project is only about 8 months

and it can save 718 tons of standard coal annually.