A thermodynamic study of waste heat recovery from GT-MHR using organic Rankine cycles

Yari, Mortaza; Mahmoudi, S.M.S.

doi:10.1007/s00231-010-0698-z

Cited by 81 publications

(32 citation statements)

References 36 publications

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“…The technology has been implemented in many processes in both commercial and pilot scale for the recovery of waste heat. Prominent among them are the oil and gas [1,22,23], cement manufacturing [17], geothermal power generation [2,6,12,13], solar power generation [11,20,31], food manufacturing [3,4] and ship and gas turbine exhaust heat recovery [27,32,33].…”

Section: Heat Recovery Potential In a Conventional Cryogenic Asu Usinmentioning

confidence: 99%

Potential for improving the energy efficiency of cryogenic air separation unit (ASU) using binary heat recovery cycles

Aneke

Wang

2015

Applied Thermal Engineering

114

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h i g h l i g h t sWe model two cryogenic air separation unit with compressor waste heat recovery. We compare the specific energy consumption of the models. We compare the overall energy consumption of the models. Compressor heat recovery improve the energy efficiency of the process. a b s t r a c tIn this paper, the potential of improving the energy efficiency of a conventional cryogenic air separation unit (ASU) was investigated through modelling and simulation using Aspen Plus ® v 8.1. It is achieved through converting the heat from the compressor effluent to electricity using organic Ranking cycle (ORC). Two different arrangements of combining compressor and waste heat recovery ORC system were compared with the conventional cryogenic ASU which was used as the benchmark. The benchmark is a conventional cryogenic ASU with 3 stages of compression which uses water for intercooling. In the first arrangement the water used as the cooling fluid of the intercooler/after cooler heat exchanger of a conventional cryogenic ASU process was replaced by R134a which also acts as the working fluid for the ORC system (C3WHR) while in the second arrangement, the 3 stages compressor of the conventional process was replaced with a single stage compressor with the same overall pressure ratio as the conventional process and the hot compressor effluent cooled with R134a which also acts as the working fluid of the ORC system (C1WHR).The simulation results based on a cryogenic ASU capable of processing 100 kg/s of atmospheric air at 30 C as feedstock show that the specific power consumption for the pure products which was 0.32 kWh/ kg, 0.37 kWh/kg and 17.35 kWh/kg for oxygen, nitrogen and argon respectively for the conventional cryogenic ASU process was reduced by the addition of the waste heat recovery ORC system. The C1WHR reduced the specific power consumption by an average of 0.2% across the aforementioned pure products while the C3WHR reduced it by an average of 11%. The net power consumption of the conventional cryogenic ASU which was 21826.19 kW was also found to be reduced by the same percentage.

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Section: Heat Recovery Potential In a Conventional Cryogenic Asu Usinmentioning

confidence: 99%

Potential for improving the energy efficiency of cryogenic air separation unit (ASU) using binary heat recovery cycles

Aneke

Wang

2015

Applied Thermal Engineering

114

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“…Reviewing the literature reveals a variety of approaches used to evaluate ORC investment costs. Some assume a value for the ORC costs (such as [20][21][22][23][24][25][26]). However representative the assumptions and insightful the analyses, these cost figures ought not to be confused with real costs.…”

Section: Orc Investment Costs: a Brief Literature Reviewmentioning

confidence: 99%

Cost Engineering Techniques and Their Applicability for Cost Estimation of Organic Rankine Cycle Systems

Lemmens

2016

Energies

121

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Abstract:The potential of organic Rankine cycle (ORC) systems is acknowledged by both considerable research and development efforts and an increasing number of applications. Most research aims at improving ORC systems through technical performance optimization of various cycle architectures and working fluids. The assessment and optimization of technical feasibility is at the core of ORC development. Nonetheless, economic feasibility is often decisive when it comes down to considering practical instalments, and therefore an increasing number of publications include an estimate of the costs of the designed ORC system. Various methods are used to estimate ORC costs but the resulting values are rarely discussed with respect to accuracy and validity. The aim of this paper is to provide insight into the methods used to estimate these costs and open the discussion about the interpretation of these results. A review of cost engineering practices shows there has been a long tradition of industrial cost estimation. Several techniques have been developed, but the expected accuracy range of the best techniques used in research varies between 10% and 30%. The quality of the estimates could be improved by establishing up-to-date correlations for the ORC industry in particular. Secondly, the rapidly growing ORC cost literature is briefly reviewed. A graph summarizing the estimated ORC investment costs displays a pattern of decreasing costs for increasing power output. Knowledge on the actual costs of real ORC modules and projects remains scarce. Finally, the investment costs of a known heat recovery ORC system are discussed and the methodologies and accuracies of several approaches are demonstrated using this case as benchmark. The best results are obtained with factorial estimation techniques such as the module costing technique, but the accuracies may diverge by up to +30%. Development of correlations and multiplication factors for ORC technology in particular is likely to improve the quality of the estimates.

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“…A thermodynamic model developed for the combined cycles with two organic Rankine cycles has been described previously by the authors [8]. The input parameters used in the simulation are listed in Table 1.…”

Section: Modelingmentioning

confidence: 99%

“…The reactor core capital cost and the cost of nuclear reactor fuel are taken to be $371/kW th (based on data for the year 2003) and $8/MWh, respectively [8,21]. To convert the capital investment into the cost per time unit, one can write [12]:…”

Section: Cost Balancesmentioning

confidence: 99%

“…In that work, the energy and exergy efficiencies of the combined cycle were both shown to be around 3 percentage-points greater than for the GT-MHR cycle. Yari and Mahmoudi also investigated the combinations of three configurations of ORCs with the GT-MHR cycle and concluded that, from a thermodynamic viewpoint, the simple ORC is the best for combination with the GT-MHR [8].…”

Section: Introductionmentioning

confidence: 99%

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A Comparative Exergoeconomic Analysis of Waste Heat Recovery from a Gas Turbine-Modular Helium Reactor via Organic Rankine Cycles

et al. 2014

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Abstract:A comparative exergoeconomic analysis is reported for waste heat recovery from a gas turbine-modular helium reactor (GT-MHR) using various configurations of organic Rankine cycles (ORCs) for generating electricity. The ORC configurations studied are: a simple organic Rankine cycle (SORC), an ORC with an internal heat exchanger (HORC) and a regenerative organic Rankine cycle (RORC). Exergoeconomic analyses are performed with the specific exergy costing (SPECO) method. First, energy and exergy analyses are applied to the combined cycles. Then, a cost-balance, as well as auxiliary equations are developed for the components to determine the exergoeconomic parameters for the combined cycles and their components. The three combined cycles are compared considering the same operating conditions for the GT-MHR cycle, and a parametric study is done to reveal the effects on the exergoeconomic performance of the combined cycles of various significant parameters, e.g., turbine inlet and evaporator temperatures and compressor pressure ratio. The results show that the GT-MHR/RORC has the lowest unit cost of electricity generated by the ORC turbine. This value is highest for the GT-MHR/HORC. Furthermore, the GT-MHR/RORC has the highest and the GT-MHR/HORC has the lowest exergy destruction cost rate. OPEN ACCESSSustainability 2014, 6 2475

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A thermodynamic study of waste heat recovery from GT-MHR using organic Rankine cycles

Cited by 81 publications

References 36 publications

Potential for improving the energy efficiency of cryogenic air separation unit (ASU) using binary heat recovery cycles

Potential for improving the energy efficiency of cryogenic air separation unit (ASU) using binary heat recovery cycles

Cost Engineering Techniques and Their Applicability for Cost Estimation of Organic Rankine Cycle Systems

A Comparative Exergoeconomic Analysis of Waste Heat Recovery from a Gas Turbine-Modular Helium Reactor via Organic Rankine Cycles

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