Design and exergy analysis of waste heat recovery system and gas engine for power generation in Tehran cement factory

Naeimi, Abbas; Bidi, Mokhtar; Ahmadi, Mohammad Hossein; Kumar, Ravinder; Sadeghzadeh, Milad; Nazari, Mohammad Alhuyi

doi:10.1016/j.tsep.2018.12.007

Cited by 73 publications

(13 citation statements)

References 16 publications

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“…Work [3] reported the analysis of exergy and energy performed for two configurations of heat recovery systems, which are used in small backup generators for electricity generation. Study [4] examines the results of a comparative exergy analysis of the gas engine's heat recovery systems for electricity generation. Several different approaches to the heat recovery of heat are proposed; their exergy efficiency has been compared.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

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Comparative analysis of the exergy efficiency of methods for protecting gas exhaust ducts of boiler plants

Fialko

Stepanova

Navrodska

et al. 2021

EEJET

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This paper reports the results of studying the exergy effectiveness of thermal methods for anti-corrosion protection of the gas-draining tracts of boiler plants. These include the method of mixing heated air into flue gases, the method of passing part of the hot gases of the boiler through the bypass chimney, and a flue gas drying method. The research involved the devised comprehensive procedure based on an exergy approach. The dependences of exergy loss Elos and the heat- exergy criterion ε on the following parameters of thermal methods have been established: the amount of heated air N mixed into flue gases, the proportion of bypassed flue gases K, and the amount of dried flue gases R. A comparative analysis of the effectiveness of heat recovery systems when applying the methods considered has been performed. It has been established that for the method of mixing, Elos and ε at ambient temperature ten=10 °C demonstrate the lowest values, that is, the efficiency of the system, in this case, is the highest. The most effective, when implementing the bypass method, is the heat recovery system at ten=10 °C. Under the method of drying, at all values of the amount of dried flue gases, the loss of exergy is the lowest at ten=0 °C. As regards the heat- exergy criterion, at values R≤20 %, the lowest values of ε are observed at ten=10 °C. At R>20 %, the lowest values of ε are at ten=0 °C. Thus, the efficiency of the system when implementing the method of drying is the highest at ten=0 °C and at the amount of dried air of R>20 %. The study reported here would provide the necessary information for designing optimal heat recovery schemes. The development of this study is to establish the relationship between the exergy and environmental efficiency of thermal protection methods in order to further reduce toxic emissions.

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Section: Literature Review and Problem Statementmentioning

confidence: 99%

“…However, in publications [3][4][5][6][7][8][9][10], the exergy efficiency of plants is estimated only by the values of their total exergy. Other studies use exergy efficiency to assess the exergy effectiveness of plants.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Comparative analysis of the exergy efficiency of methods for protecting gas exhaust ducts of boiler plants

Fialko

Stepanova

Navrodska

et al. 2021

EEJET

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“…The provided backup boiler is usually fed with fossil fuels such as natural gas. On the other hand, thermal storage systems require a high initial investment . Therefore, the best option can be applying a hybridized structure to the existed power plants including both solar thermal systems and thermal storage mediums .…”

Section: Introductionmentioning

confidence: 99%

Hybrid solar parabolic dish power plant and high‐temperature phase change material energy storage system

2019

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Summary In this study, a conventional steam power plant with two regenerative boilers is considered, and one of its boilers is replaced with parabolic solar dish collectors and storing the produced thermal energy by the phase change material (PCM) in a storage tank. The results show the necessity of the existence of an auxiliary fired‐gas boiler to provide constant load during the whole 24 hours. The performance of the proposed hybridized system is evaluated through energy and exergy analyses. It was demonstrated that substituting solar collectors with one of the boilers marginally lowers the energy efficiency but increases the exergy efficiency of the whole power plant up to 41.76%. Moreover, it is found out that this hybridization decreases the total irreversibility of the power plant in comparison with the base case, from 51.1 to 47.2 MW. The parametric analysis states that raising the mass flow rate of the heat transfer fluid in the solar collectors not only enhances the system performance but also increases the volume of the PCM tank.

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“…The complexity of the steam boiler makes it challenging to perform common measurements since several factors affect the performance of the boiler. Traditional evaluation methods of boiler performance are neither cost-effective nor time-saving [9,10]. Besides, to carry out a comprehensive, accurate analysis, the fuel composition should be analyzed before and after the combustion process in detail [11,12].…”

Section: Introductionmentioning

confidence: 99%

Modeling and Efficiency Optimization of Steam Boilers by Employing Neural Networks and Response-Surface Method (RSM)

et al. 2019

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Boiler efficiency is called to some extent of total thermal energy which can be recovered from the fuel. Boiler efficiency losses are due to four major factors: Dry gas flux, the latent heat of steam in the flue gas, the combustion loss or the loss of unburned fuel, and radiation and convection losses. In this research, the thermal behavior of boilers in gas refinery facilities is studied and their efficiency and their losses are calculated. The main part of this research is comprised of analyzing the effect of various parameters on efficiency such as excess air, fuel moisture, air humidity, fuel and air temperature, the temperature of combustion gases, and thermal value of the fuel. Based on the obtained results, it is possible to analyze and make recommendations for optimizing boilers in the gas refinery complex using response-surface method (RSM).

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Design and exergy analysis of waste heat recovery system and gas engine for power generation in Tehran cement factory

Cited by 73 publications

References 16 publications

Comparative analysis of the exergy efficiency of methods for protecting gas exhaust ducts of boiler plants

Comparative analysis of the exergy efficiency of methods for protecting gas exhaust ducts of boiler plants

Hybrid solar parabolic dish power plant and high‐temperature phase change material energy storage system

Modeling and Efficiency Optimization of Steam Boilers by Employing Neural Networks and Response-Surface Method (RSM)

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