Design and Thermodynamic Analysis of Waste Heat Recovery System of Sludge Hydrothermal Carbonization

Abstract

This paper proposes a new type of sludge hydrothermal carbonization waste heat recovery system, which transfers the heat in the sludge hydrothermal carbonization to the combustion air of the boiler through total heat exchange to achieve waste heat recovery. The waste heat recovery system makes full use of the heat in the steam and improves the calorific value of the sludge entering the incinerator. With the increase of combustible matter content in sludge, the exergy efficiency of waste heat recovery system increases. Due to the improved steam quality and the use of small turbines to do work, the operating economy is improved.