Considerable amount of energy provided for drying processes is rejected to the environment with the moisture in the discharged moist gas

which results in a significant energy inefficiency of the drying processes. In this paper

a new double-stage open absorption heat pump system has been proposed to recover the latent heat of the moist gas and produce high-temperature output

especially in the forms of steam

which is more practical for industrial application and more easier to store. A mathematical model was constructed to analyze the performance of the system. It was demonstrated that the secondary generator pressure pg2 had to be optimized to get a high energy-saving rate (RES)

but heat recovery rate (η) of moist gas decreased with the increase of pg2. The optimized pg2 was 81.78 kPa when pressure of driven steam supplied to generators (pdsg) supplied to generators was above 750 kPa. The η increased with the increase of pdsg

and the highest η could achieve 49.5%. It was also found that the RES achieved from 16.47% to 60.3% when pdsg was from 550 to 850 kPa

which means that when 1 kg paper product was produced 60% of energy consumption could be saved.