Date:

2025-04-30

Title of Paper:

System optimisation and performance analysis of CO2 transcritical power cycle for waste heat recovery

Journal:

Energy

Summary:

Compared with the organic Rankine cycle (ORC) and the steam Rankine cycle, the Carbon Dioxide transcritical power cycle (CDTPC) shows a higher potential in converting middle-grade waste heat into useful work. To overcome the shortcomings of the CDTPC in utilizing waste heat of exhaust gas from gas turbines or internal combustion engines, a new type of single-pressure, multi-stage CDTPC was proposed in this work. System parameter optimization was carried out on various CDTPC using the genetic algorithm(GA) to achieve the maximum net power output of cycle. A comparative study between the existing CDTPC and the proposed new type of CDTPC with the same Tgi (from 250°C to 500°C) shows that the new type of CDTPC can increase the net power output by 3.9–26.3% and decrease the optimum working pressure by 13.2–31.0%. If the exhaust gas is non-corrosive, waste heat can be utilized more effectively by the double-stage CDTPC when 250°C ≤Tgi≤412°C and by the three-stage CDTPC when 412°C≤Tgi≤ 500°C. However, if the exhaust gas is corrosive, waste heat is utilized more effectively by the single-stage CDTPC when 250°C≤Tgi≤ 338°C and by the double-stage CDTPC when 338°C ≤Tgi≤500°C. In addition, the effect of regenerator on the thermal performance of various CDTPC is studied.

Co-author:

吴闯，颜晓江，王顺森，白昆仑，邸娟，程上方，李军

Volume:

100（2016）

Page Number:

391-400

Translation or Not:

No

Date of Publication:

2016-04-01