Enhancing steam boiler efficiency through comprehensive energy and exergy analysis: A review

Elwardany, Mohamed

doi:10.1016/j.psep.2024.01.102

Cited by 12 publications

(1 citation statement)

References 97 publications

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“…The convection section is mainly composed of light tubes or finned tubes, which mainly generate steam or high-temperature gas through thermal convection. 9 The steam dryness provided by coal-fired boilers is generally greater than 80%. The surface heater technology is relatively mature, but it is prone to dust accumulation in the heat exchange section and has a high maintenance frequency.…”

Section: Introductionmentioning

confidence: 99%

Investigations on the Performance of a Downhole Electric Heater with Different Parameters Used in Oil Shale In Situ Conversion

Ren,

Wang,

Yang

et al. 2024

ACS Omega

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In situ conversion is the most potential technology for efficient and clean development of oil shale, and a downhole electric heater is key equipment for clean, efficient, and low-carbon in situ conversion. Three electric heating rods with different diameters are used to explore their influence on heater performances. The simulation results indicate that increasing the diameter of the heating rod helps to increase the minimum and maximum velocity of shell-side air, and the maximum velocity of H110-24 is 16.34 m/s, which is 1.25 and 1.13 times those of H110-16 and H110-20, respectively. In addition, the location of the local high temperature zone coincides with the area with low air flow velocity, and increasing the diameter of the heating rod can effectively reduce the heating rod surface temperature during high-power heating. Moreover, at the same heat flux, the heat transfer coefficients of H110-24 and H110-20 are 44.82−48.49% and 87.52−95.48% higher than those of H110-16, respectively. With the same heating power, the heat transfer coefficients of heaters have the same trend, indicating that the heat transfer coefficient of the heating rod can be effectively improved by increasing the diameter of the heating rod. Finally, the newly defined comprehensive performance is used to evaluate the heaters with different heating parameters. Increasing the heating power can improve the comprehensive performance of the heater, but the most effective way is to increase the diameter of the heating rod. With the same heating power, the new comprehensive performance of H110-24 and H110-20 is 48.38− 52.34% and 87.29−95.19% higher than that of H110-16, respectively, and the electric heating rod with the diameter of 20 mm has the best performance.

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Section: Introductionmentioning

confidence: 99%

Investigations on the Performance of a Downhole Electric Heater with Different Parameters Used in Oil Shale In Situ Conversion

Ren,

Wang,

Yang

et al. 2024

ACS Omega

View full text Add to dashboard Cite

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Reduction of CO2 emissions by recycling low-potential heat from the Benfield CO2 removal process at a natural gas hydrogen production plant

Hajduga,

Chmielarz,

Bugdol

2024

Clean Techn Environ Policy

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The EU policies related to CO2 emission strictly define the stages of carbon neutrality achieving. According to these regulations, all production installations that emit carbon dioxide will be charged additional emission fees from 2026 to fully in 2035. Analysis of the increasing emission fees shows that in some industries incurring such additional costs will result in a lack of profitability of the products. Industries directly related to the food sector, such as nitrogen fertiliser production, are strategic in the economies of all countries. Nitrogen fertilisers are produced from ammonia, which is synthesised on a large scale from hydrogen and nitrogen. Hydrogen is produced by natural gas reforming with water vapour resulting in syngas (mixture of H2, CO, CO2, H2O), which CO in the next step reacts with water vapour (water gas shift reaction) producing H2 and CO2. CO2 is separated from hydrogen using the Benfield method. The analysis of the Benfield process (one process of hydrogen production) shows a possible way to reduce CO2 emission by optimising heat balance. It was shown that in the proposed technology the heat recovery reaches 89%, while the level below 30% was reported for other available technologies. The proposed solution is based on recirculation and reuse of heat, which is lost in other technologies. The analysis is for a process balance in a medium-sized hydrogen production installation. The analysis considers also the correlations with other installations thermally linked to hydrogen production. The economic balance showed the great financial benefits of this solution. In the scenario discussed, the CO2 emission factor was reduced by 20%. Graphical Abstract

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Exergy analysis of a gas turbine cycle power plant: a case study of power plant in Egypt

Elwardany,

Nassib,

Mohamed

2024

J Therm Anal Calorim

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This research presents an exergy analysis of a gas turbine power plant situated in Assiut, Egypt, operating under high-temperature conditions. The aim of the study is to assess the performance of the simple gas turbine cycle and identify the sources of thermodynamic inefficiencies using the second law of thermodynamics as a basis for analysis. To accomplish this, a model was developed in EES software utilizing real operational data obtained from the plant's control system. The investigation focused on the impact of varying ambient temperature on the exergy efficiency, exergy destruction, and net power output of the cycle. The results revealed that the combustion chamber accounted for the highest exergy destruction, amounting to 85.22%. This was followed by the compressor at 8.42% and the turbine at 6.36%. The overall energy and exergy efficiencies of the system were determined to be 28.8% and 27.17%, respectively. Furthermore, the study examined the effects of increasing ambient temperature from 0 to 45°C on the system's performance. It was observed that as the temperature rose, the overall exergy efficiency decreased from 27.91 to 26.63%. Simultaneously, the total exergy destruction increased from 126,407 to 138,135 kW. Additionally, the net power output exhibited a decline from 88,084 to 84,051 kW across the same ambient temperature range. These findings highlight the significant influence of ambient temperature on the thermodynamic performance of gas turbine power plants. As temperature rises, a greater amount of exergy is lost, resulting in reduced efficiency and diminished net power output. Therefore, optimizing the design of the combustion chamber is crucial for mitigating the adverse effects of hot weather conditions. The insights obtained from this study can be utilized to enhance the design and operation of gas turbine plants operating in hot climates.

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Enhancing steam boiler efficiency through comprehensive energy and exergy analysis: A review

Cited by 12 publications

References 97 publications

Investigations on the Performance of a Downhole Electric Heater with Different Parameters Used in Oil Shale In Situ Conversion

Investigations on the Performance of a Downhole Electric Heater with Different Parameters Used in Oil Shale In Situ Conversion

Reduction of CO2 emissions by recycling low-potential heat from the Benfield CO2 removal process at a natural gas hydrogen production plant

Exergy analysis of a gas turbine cycle power plant: a case study of power plant in Egypt

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