The Role of Pinch Analysis for Industrial ORC Integration

Olsen, Donald G.; Abdelouadoud, Yasmina; Liem, Peter; Wellig, Beat

doi:10.1016/j.egypro.2017.09.193

Cited by 22 publications

(12 citation statements)

References 3 publications

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“…Therefore, we will use two types of exergy. During evaporation or condensation, as well as melting or crystallization from the melt, which occur at a constant ambient temperature, the thermal specific exergy is [15]:…”

Section: Exergy Pinch Analysis Of the Boilermentioning

confidence: 99%

Эксергетический Пинч-Анализ Всех Элементов Котельного Агрегата И Котельного Агрегата В Целом

Лебедев¹,

Юшкова²

2020

IZVESTIYA

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The relevance of the research is caused by the need to improve the energy efficiency of heating systems, since all types of fuel are becoming more expensive. In this regard, there is a need to create a method of thermodynamic improvement of heat engineering systems. The main aim of the research is the creation of a method for improving heating systems, the application of this method on the example of a boiler unit PP-2650-255 GM. Objects: a direct-flow boiler PP-2650-255 GM, for which a thermodynamic analysis of the processes occurring in individual elements of the boiler – an air heater, economizer, firebox, and superheater – is performed. The article analyzes all heat fluxes on each element of the boiler. Methods. An exergy method of thermodynamic analysis is used as a research tool. It allows taking into account the energy potential of thermal processes. To date, the most effective method of parametric optimization of heat and power processes is the method of integration of heat flows (pinch method). However, the pinch method is based on a change in flow enthalpy, which does not take into account the qualitative characteristics of energy. In the article, the development of the pinch method continues; flow exergy is used instead of flow enthalpy. Optimization of heat engineering parameters is carried out using an exergy pinch method. Results. Exergy pinch analysis allows you to identify unused exergy and determine in which part the loss occurs. According to the calculations and the graph, it can be seen that hot flows lost 1503,57 MW of exergy, cold flows took 1295,57 MW of exergy, taking into account cooling of the working fluid by bypass. Thus, 47,9 MW of unused exergy was detected in this boiler unit. The results of the exergy pinch analysis allow us to formulate and justify specific design measures to improve the energy efficiency of the boiler unit. This analysis allows you to effectively use the energy and resources of heating equipment.

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Section: Exergy Pinch Analysis Of the Boilermentioning

confidence: 99%

Эксергетический Пинч-Анализ Всех Элементов Котельного Агрегата И Котельного Агрегата В Целом

Лебедев¹,

Юшкова²

2020

IZVESTIYA

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“…If the ORC power plant should somehow be out of service, while the kiln is under full operation, the waste gas bypasses the heat exchanger and takes the regular path through the cooling tower. In bypass mode, the clinker cooler air is cooled in the existing cooler before it arrives the dust precipitator [61][62][63].…”

Section: Exergy Efficiencymentioning

confidence: 99%

Thermodynamic investigation of organic Rankine cycle energy recovery system and recent studies

et al. 2018

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Recently, new environment-friendly energy conversion technologies are required for using energy resources valid to power generation. Accordingly, low-grade heat sources as solar heat, geothermal energy, and waste heat, which have available temperatures ranging between 60 and 200 °C, are supposed as applicants for recent new generation energy resources. As an alternative energy source, such low-grade heat sources usage generating electricity with the help of power turbine cycles was examined through this study. Such systems have existing technologies applicable at low temperatures and a compact structure at low cost, however, these systems have a low thermal efficiency of the Rankine cycles operated at low temperatures. An organic Rankine cycle is alike to a conventional steam power plant, except the working fluid, which is an organic, high molecular mass fluid with a liquid-vapor phase change, or boiling point, at a lower temperature than the water-steam phase change. The efficiency of an organic Rankine cycle is about between 10% and 20%, depending on temperature levels and availability of a valid fluid.

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“…ORC is one of the most widely used technologies for waste heat recovery in Europe, the United States, and Central America [ 8 ]. However, during heat extraction in the ORC system, the working fluid undergoes phase variation, making no good thermal match between the working fluid and the heat source, which disables the effective and full utilization of the heat source [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

Using a Partially Evaporating Cycle to Improve the Volume Ratio Problem of the Trilateral Flash Cycle for Low-Grade Heat Recovery

Lai

Lee

Lai

et al. 2021

Entropy

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This study examined the trilateral flash cycle characteristics (TFC) and partially evaporating cycle (PEC) using a low-grade heat source at 80 °C. The evaporation temperature and mass flow rate of the working fluids and the expander inlet’s quality were optimized through pinch point observation. This can help advance methods in determining the best design points and their operating conditions. The results indicated the partially evaporating cycle could solve the high-volume ratio problem without sacrificing the net power and thermal efficiency performance. When the system operation’s saturation temperature decreased by 10 °C, the net power, thermal efficiency, and volume ratio of the trilateral flash cycle system decreased by approximately 20%. Conversely, with the same operational conditions, the net power and thermal efficiency of the partially evaporating cycle system decreased by only approximately 3%; however, the volume ratio decreased by more than 50%. When the system operating temperature was under 63 °C, each fluid’s volume ratio could decrease to approximately 5. The problem of high excessive expansion would be solved from the features of the partially evaporating cycle, and it will keep the ideal power generation efficiency and improve expander manufacturing.

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The Role of Pinch Analysis for Industrial ORC Integration

Cited by 22 publications

References 3 publications

Эксергетический Пинч-Анализ Всех Элементов Котельного Агрегата И Котельного Агрегата В Целом

Эксергетический Пинч-Анализ Всех Элементов Котельного Агрегата И Котельного Агрегата В Целом

Thermodynamic investigation of organic Rankine cycle energy recovery system and recent studies

Using a Partially Evaporating Cycle to Improve the Volume Ratio Problem of the Trilateral Flash Cycle for Low-Grade Heat Recovery

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