On low-grade waste heat utilization from a supercritical steam power plant using an ORC-bottoming cycle coupled with two sources of heat

Ziółkowski, Paweł; Kowalczyk, Tomasz; Kornet, Sebastian; Badur, Janusz

doi:10.1016/j.enconman.2017.05.028

Cited by 56 publications

(15 citation statements)

References 34 publications

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“…An increase in live steam conditions cannot be achieved without intervening in the structure of a thermal cycle or without the changing of local parameters. As a consequence, a number of PP configurations have been introduced, i.e., those with a single reheat [12], those with a double reheat [13], those with a regenerative-also called tuning-turbine [14], and solutions utilising waste heat to improve PP efficiency [15]. The development of such technology also presents a number of challenges in the development of even more advanced combined gas-steam cycles [16,17].…”

Section: Introductionmentioning

confidence: 99%

Power Plant Optimisation—Effective Use of the Nelder-Mead Approach

et al. 2020

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This paper demonstrates the use of a combined software package including IPSEpro and MATLAB in the optimisation of a modern thermal cycle. A 900 MW power plant unit (operating at ultra-supercritical conditions) was considered as the study object. The Nelder-Mead simplex-based, direct search method was used to increase power plant efficiency and to find the optimal thermal cycle configuration. As the literature reveals, the Nelder-Mead approach is very sensitive to the simplex size and to the choice of method coefficients, i.e., reflection, expansion and contraction. When these coefficients are improperly chosen, the finding of the optimal solution cannot be guaranteed, particularly in such complex systems as thermal cycles. Hence, the main goal of the present work was to demonstrate the capability of an integrated software package including IPSEpro, MATLAB and MS Excel in the optimisation process of a complex thermal cycle, as well as to examine the effectiveness of the most popular sets of Nelder-Mead coefficients previously proposed by other researchers. For the investigation purposes, the bleed and outlet pressures from the turbines were considered as decision variables, and the power plant efficiency was used as an objective function.

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Section: Introductionmentioning

confidence: 99%

Power Plant Optimisation—Effective Use of the Nelder-Mead Approach

et al. 2020

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“…One of them is the thermal energy storage technology. Thermal energy that can be directly used and easily assembled has attracted much attention [1,2]. One important material for thermal energy storage is a phase-change material (PCM), which can absorb and release a large amount of thermal energy during the phase change process (solid-liquid, solid-solid and liquid-gas).…”

Section: Introductionmentioning

confidence: 99%

Expanded Graphite/Paraffin/Silicone Rubber as High Temperature Form-stabilized Phase Change Materials for Thermal Energy Storage and Thermal Interface Materials

Zhang

Huang

et al. 2020

Materials

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In this work, expanded graphite/paraffin/silicone rubber composite phase-change materials (PCMs) were prepared by blending the expanded graphite (EG), paraffin wax (PW) and silicone rubber (SR) matrix. It has been shown that PW fully penetrates into the three dimensional (3D) pores of EG to form the EG/PW particles, which are sealed by SR and evenly embedded in the SR matrix. As a result of the excellent thermal stability of SR and the capillary force from the 3D pores of EG, the EG/PW/SR PCMs are found to have good shape stability and high reliability. After being baked in an oven at 150 °C for 24 h, the shape of the EG/PW/SR PCMs is virtually unchanged, and their weight loss and latent heat drop are only 7.91 wt % and 11.3 J/g, respectively. The latent heat of the EG/PW/SR composites can reach up to 43.6 and 41.8 J/g for the melting and crystallizing processes, respectively. The super cooling of PW decreased from 4.2 to 2.4 due to the heterogeneous nucleation on the large surface of EG and the sealing effect of the SR. Meanwhile, the thermal conductivity of the EG/PW/SR PCMs reaches 0.56 W·m−1·K−1, which is about 2.8 times and 3.73 times of pure PW and pristine SR, respectively. The novel EG/PW/SR PCMs with superior shape and thermal stabilities will have a potential application in heat energy storage and thermal interface materials (TIM) for electronic devices.

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“…Over the past few decades, researchers around the world has been working for methods to enhance the efficiency of power generation systems and ways to improve them. The heat waste from power generation plants and huge engines has become a point of interest for energy recovery and optimization [1]. Research on such low temperature energy recovery systems is important not only as a mean to provide additional power generation, but also to reduce the negative impact of the heat waste to the climate and environment.…”

Section: Introductionmentioning

confidence: 99%

An artificial intelligent approach for the optimization of organic rankine cycle power generation systems

Tan

Lim

Koh

et al. 2019

IJEECS

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<span>The study on Organic Rankine Cycle (ORC) power generation system has gained significant popularity among researchers over the past decade, mainly due to the financial and environmental benefits that the system provides. A good maximum power point tracking (MPPT) mechanism can push the efficiency of an ORC to a higher rate. In this research, a Self-Adjusted Peak Search algorithm (SAPS) is proposed as the MPPT scheme of an ORC system. The SAPS has the ability to perform a relatively detailed search when the convergence reaches the near-optima peak without jeopardizing the speed of the overall convergence process. The SAPS is tested in a simulation to track for a moving maximum power pint (MPP) of an ORC system. Experiment results show that the SAPS outperformed several other well-established optimization algorithm in tracking the moving MPP, especially in term of the solution accuracies. It can thus be concluded that the proposed SAPS performs well as a mean of an MPPT scheme in an ORC system</span>

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On low-grade waste heat utilization from a supercritical steam power plant using an ORC-bottoming cycle coupled with two sources of heat

Cited by 56 publications

References 34 publications

Power Plant Optimisation—Effective Use of the Nelder-Mead Approach

Power Plant Optimisation—Effective Use of the Nelder-Mead Approach

Expanded Graphite/Paraffin/Silicone Rubber as High Temperature Form-stabilized Phase Change Materials for Thermal Energy Storage and Thermal Interface Materials

An artificial intelligent approach for the optimization of organic rankine cycle power generation systems

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