Optimum design of bivariate operation strategy for a supercritical/ transcritical CO2 hybrid waste heat recovery system driven by gas turbine exhaust

Cao, Yue; Zhan, Jun; Jia, Boqing; Chen, Ranjing; Si, Fengqi

doi:10.1016/j.energy.2023.129325

Cited by 4 publications

(1 citation statement)

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“…This study found energy and exergy efficiencies of 64.14% and 72.13%, respectively. Cao et al [11] focused on studying how to valorize waste heat from gas turbine exhaust gases in a hybrid supercritical-transcritical carbon dioxide (CO 2 ) waste heat recovery system, where the inlet pressure of the turbine and mass flow played an important role in achieving system performance. Zhang et al [12] proposed a system for recovering residual heat from combustion gases integrated into the bypass duct and the exterior primary air preheater of a bitumen-fired power plant with the aim of limiting heat losses due to the mixture of cold air with heated primary air.…”

Section: Introductionmentioning

confidence: 99%

Innovative Multigeneration System with Heat Exchangers for Harnessing Thermal Energy from Cement Kiln Exhaust Gases

Mungyeko Bisulandu,

Mansouri,

Tsimba Mboko

et al. 2024

Energies

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This article introduces a novel multiple-cycle generation system for efficient heat recovery at high and low temperatures. The system is modeled and optimized using the M2EP analysis method (mass, energy, exergy, and performance) and the particle swarm optimization algorithm. The multigeneration system produces electricity, cold, domestic hot water, and biogas by utilizing Kalina cycles, diffusion–absorption refrigeration machines, and high-performance heat exchangers by harnessing waste heat from cement kiln exhaust gases. The Kalina cycle is employed for electricity generation, wherein the H2O+NH3 mixture, heated by hot water, circulates through heat exchangers. Downstream of the Kalina cycle, the refrigeration machine generates cold by evaporating the strong solution of the H2O+NH3 mixture. Hydrogen circulates in the diffusion–absorption refrigerator (DAR) circuit, facilitating the exchange between the evaporator and the absorber. The domestic hot water and biogas production systems operate at lower temperatures (around 45 °C). The simulation results for the Kalina cycle indicate an electrical energy production of 2565.03 kW, with a release of usable energy (residual gases) estimated at 7368.20 kW and a thermal efficiency of 22.15%. Exergy destruction is highest at heat exchanger 1, accounting for 26% of the total. A coefficient of performance of 0.268 and an evaporator temperature of 10.57 °C were obtained for the DAR cycle. The absorber contributes the most to energy exchanges, comprising 37% of the entire circuit. Summarizing the potential for valorizing waste heat from cement kilns, this article lays the foundation for future research.

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Section: Introductionmentioning

confidence: 99%