Exergy-based analysis combined with LCA for waste heat recovery in coal-fired CHP plants

Zhang, Qi; Gao, Jiao; Wang, Yujie; Wei, Lin; Yu, Zaihai; Song, Dayong

doi:10.1016/j.energy.2018.12.017

Cited by 28 publications

(3 citation statements)

References 32 publications

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“…For example, Jing et al (2012a) optimized the capacities and operation strategies of a gas engine driven CCHP system using the LCA optimization methodology, in which, three environmental impacts, i.e., acidification potential, global warming potential and respiratory effects potential, are considered. While, Zhang et al (2019) conducted an exergy-based analysis for coal-fired cogeneration plants based on LCA. The above researches mainly focused on the evaluation of the system performance from the life cycle perspective, few integrated the life cycle analysis methodology with multi-objective optimization technique.…”

Section: Special Issue On Waste Valorisation For Sustainablementioning

confidence: 99%

Multi-Objective Sustainability Optimization of CCHP Systems Considering the Discreteness of Equipment Capabilities

Ren

Ding

Dong

et al. 2021

Journal of Environmental Engineering and Landscape Management

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The value of waste heat had led to an extensive study on Combined Cooling, Heating and Power (CCHP) system in recent decades, but the following three research gaps still need to be tackled to achieve a better economic and environmental performance. Firstly, the complete discreteness of equipment capabilities had not been considered. It means that multiple units with different capacities cannot be selected for a type of equipment. Then, the ambiguity and subjectivity existing in decision-makers/stakeholders’ judgments on the importance of objectives are usually ignored. Finally, an easily understood and comprehensive environmental indicator based on life cycle perspective for system optimization had not been established. Thus, the aim of this study is to establish a mathematical framework to help the stakeholders select the optimal configurations, capacities, and operation conditions of CCHP system while narrowing the above three research gaps to avoid the sub-optimal solutions. Subsequently, a hypothetical case was used to verify the validity of the proposed model, along with analysis of system performance. The results indicate that the CCHP system is superior to the conventional systems, and the proposed mathematical model in this paper can improve the performance of CCHP system in terms of economy, environment, and energy.

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Section: Special Issue On Waste Valorisation For Sustainablementioning

confidence: 99%

Multi-Objective Sustainability Optimization of CCHP Systems Considering the Discreteness of Equipment Capabilities

Ren

Ding

Dong

et al. 2021

Journal of Environmental Engineering and Landscape Management

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“…Over the last decade, this work has focused primarily on increasing the energy efficiency of DHSs by implementing cogeneration and tri-generation technologies (mainly based on coal [1,2], gas [3] and oil [4]), making the widest possible use of renewable energy sources [5,6] and implementing smart District Heating Networks in future sustainable energy systems [7][8][9][10][11][12]. Based on the abovementioned papers, it can be concluded that the intelligent district heating system has a number of advantages compared to the traditional heating system in many areas, including troubleshooting, energy saving, regulation and control.…”

Section: Introductionmentioning

confidence: 99%

Energy Savings Analysis for Operation of Steam Cushion System for Sensible Thermal Energy Storages

2022

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The paper presents an analytical discussion of how to improve the energy efficiency of the steam cushion system operation for a Thermal Energy Storage (TES) tank. The EU’s green deal 2050 target policy requires an increase in the energy efficiency of energy production and use, as well as an increase in the share of renewable energy in the overall energy production balance. The use of energy-efficient TES is considered as one of the most important technologies to achieve the objectives of this EU policy. The analyses presented in the paper of energy-efficient operation of steam cushion (SC) systems were carried out by using operational data received from three District Heating Systems (DHSs) that supply heat and electricity to one of the largest cities in Poland and are equipped with the TES systems. These three analyzed TESs differ in capacities from 12,800 to 30,400 m3, tank diameters from 21 to 30 m and shell height from 37 to 48.2 m. The main purpose of using a steam cushion system in the TES tank is to protect the water stored in it against the absorption of oxygen from the surrounding atmospheric air through the surge chamber and safety valves located on the roof of the tank. The technical solutions presented here for the upper orifice for charging and discharging hot water into/from the tank and the suction pipe for circulating water allow to us achieve significant energy savings in the steam cushion systems. Both the upper orifice and the end of suction pipe are movable through the use of pontoons. Thanks to the use of this technical solution, a stable insulating water layer is created above the upper orifice in the upper part of the TES tank, where convective and turbulent transport of heat from the steam cushion space to the hot water stored in the tank is significantly limited. Ultimately, this reduces the heat flux by approximately 90% when compared to the classic technical solutions of steam cushion systems in TES tanks, i.e., for the upper orifice and circulation water pipe. The simplified analysis presented in the paper and comparison of its results with experimental data for heat flow from the steam cushion space to hot water stored in the upper part of the TES tank fully confirms the usefulness of the heat-flow models used.

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“…The study is based on the mathematical formulation for the cost formation of residues, proposed by Torres et al [ 2 ], and it defines the concept of “waste cost distribution ratio” as a means to determine the responsibility of any productive component to any generated residue. Recently, this criterion has been used by Gao et al [ 18 ] and Zhang et al [ 19 ] to conduct an exergy-based analysis of a coal-fired combined heat and power system with three residues, corresponding to exhaust gases, waste heat dissipated from the condenser, and ashes produced by the coal combustion.…”

Section: Introductionmentioning

confidence: 99%

An Irreversibility-Based Criterion to Determine the Cost Formation of Residues in a Three-Pressure-Level Combined Cycle

Méndez

González

Hernández

et al. 2020

Entropy

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In an energy system, it is important to identify the origin of residue formation in order to implement actions to reduce their formation or to eliminate them as well as to evaluate their impact on the production costs of the system. In the exergetic cost theory, although there are several criteria to allocate the cost formation of residues to the productive components, no unique indication on the best choice has been defined yet. In this paper, the production exergy costs are determined by allocating the residue cost formation to the irreversibilities of the productive components from which they originate. This criterion, based on the Gouy–Stodola theorem, is an extension of the criterion of entropy changes, and unlike this, it avoids the existence of a negative production cost. This criterion is applied to a combined cycle of three pressure levels, and the production exergy costs are compared with the criteria of entropy changes, distributed exergy, and entropy. The results of the proposed criterion are in agreement with the compared criteria.

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Exergy-based analysis combined with LCA for waste heat recovery in coal-fired CHP plants

Cited by 28 publications

References 32 publications

Multi-Objective Sustainability Optimization of CCHP Systems Considering the Discreteness of Equipment Capabilities

Multi-Objective Sustainability Optimization of CCHP Systems Considering the Discreteness of Equipment Capabilities

Energy Savings Analysis for Operation of Steam Cushion System for Sensible Thermal Energy Storages

An Irreversibility-Based Criterion to Determine the Cost Formation of Residues in a Three-Pressure-Level Combined Cycle

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