Application of waste heat recovery energy-saving retrofit technology for air compressors
WEN Zexian
Abstract：Regarding the energy consumption issue of the heating water system for the cooling wheels of plastic production lines,a technical renovation scheme based on the recovery of waste heat from air compressors is proposed.Without changing the original working state of the air compressors,the residual heat from three air compressors with a power of 75 kW is utilized to produce hot water ranging from 65℃to 70℃through a heat recovery device,directly replacing the heating demand of the original mold temperature machine.The results show that the scheme could recover 972 200 kWh of heat equivalent to standard electricity per year,achieve a reduction of 275 400 kWh of annual electricity consumption,equivalent to 33.84 t of standard coal(equivalent value)of annual comprehensive energy savings,and reduce CO2 emissions by 148.58 t.The total investment of the project is 853 500 yuan,with an annual income of 181 800 yuan.The static investment recovery period is approximately 5.24 a,demonstrating excellent energy-saving effects and economic feasibility.
Keywords：air compressorswaste heat recoveryenergy-saving retrofiteconomic benefits
Publication Date：2026-02-25
Online Publishing Date：2026-03-31(First online date of this platform, not the publication date of the document)
Pages：3( 95-97 )