Self-cooled thermodynamic cycle method

Abstract

The invention discloses a self-cooled thermodynamic cycle method and belongs to the field of thermal energy power. The working medium of a thermodynamic system absorbs heat from a heat source to applywork after boosting. The self-cooled thermodynamic cycle method comprises the following steps: the boosting process of the working medium from the low-temperature state, the preheating process afterboosting, the heat absorption process from the heat source enabling the working medium to become a power air source, the expansion work applying process of the power air source after entering into anexpansion work-applying system, the further heat release and heat discharging process of the low-temperature air working medium after expansion work applying and the thermodynamic cycle realizing process; a thermodynamic cycle system adopts open cycle or closed cycle; the heat pump adopting process absorbs all or part of heat released by the working medium during the heat discharging process; thepreheating process directly or indirectly absorbs all or part of heat discharged during the heat pump process; a heat returning process can be adopted between the heat discharging process and the preheating process; and the thermodynamic system recycles all or part of heat discharged during the heat discharging process through the heat pump process and the heat returning process.

Description

technical field [0001] The invention belongs to the field of thermal power. Background technique [0002] In the field of thermodynamics, the reversible Carnot cycle has always been considered to have the highest thermal efficiency. However, compared with the Rankine cycle, the adiabatic compression process of the Carnot cycle cannot realize the regenerative cycle, and the regenerative cycle can improve the thermal efficiency. Especially in the supercritical Rankine cycle, the supercritical liquid working medium and gas working medium can not only absorb low-temperature exhaust heat through the regenerative cycle, but also have a specific heat much larger than that of the normal pressure gas working medium, that is, the supercritical Rankine The energy-saving potential of the regenerative capacity during cyclic constant-pressure heating has been neglected. Invention patent application CN201310497436.1 (publication number CN103775148A) made good use of this potential, and pr...

AI Technical Summary

Problems solved by technology

However, its limitation is that the exhaust heat of the heat pump that recovers the exhaust heat first enters the expansion process, and then passes through the heat recovery process together with the system waste heat to transfer to the heating process, so it is at least limited in terms of implementation methods and application fields

Images