Cogeneration system based on large temperature difference heat transfer with stepwise utilization

Tian, Wenbiao; Teng, Shiyang; Xi, Huan

doi:10.1016/j.enconman.2023.116843

Cited by 9 publications

(5 citation statements)

References 65 publications

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“…The ACHP system uses the following assumptions in the modeling and calculation process: , (1) The system operates in a state of thermal equilibrium and stability, without considering heat exchange with the surroundings. (2) The working fluid achieves saturation at the outlets of the evaporator and condenser, reaching thermal equilibrium.…”

Section: Modeling and Analysismentioning

confidence: 99%

“…There was no increase in energy efficiency for the ORC system, and the problem of high temperatures at the heat source out of the system was not addressed. In contrast, Tian et al 35 made a significant breakthrough by designing a two-stage absorption heat exchanger (AHE) and integrating it into an ORC system, resulting in a high-efficiency cogeneration system known as AHEORC–CHP (The absorption heat exchanger coupled ORC combined heat and power system.) This innovative AORC system effectively harnessed waste heat sources, reducing the heat source temperature to 24.69 °C while achieving a high-temperature efficiency of 1.2 and a thermoelectric efficiency of 90.9%.…”

Section: Introductionmentioning

confidence: 99%

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“3E” Analysis and Working Fluid Selection for a Cogeneration System for Geothermal Large Temperature Difference Utilization

Yin,

Zhu,

Zhang

et al. 2024

ACS Omega

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Widespread utilization of geothermal energy as a clean energy source can reduce the use of fossil fuels and thereby protect the environment. Previous combined heat and power (CHP) systems using low-temperature geothermal heat as a heat source have limited utilization of geothermal heat. In this study, a cogeneration system based on organic Rankine cycle (ORC) and absorption heat exchanger (AHE) is designed. We analyzed the thermal efficiency, exergy efficiency, and economics of the proposed system utilizing 85 °C lowtemperature geothermal heat, and the optimal operating fluid for this system is discussed. The results show that the optimal working fluid for the proposed system is R245fa. Using R245fa as the working fluid, the proposed system can achieve an exergy efficiency of 61.39%, when the heat source outlet temperature can be as low as 23 °C, while the proposed system can achieve the lowest LCOE of 0.082 ($/kW •h) when using R22 as the working fluid.

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Section: Modeling and Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“3E” Analysis and Working Fluid Selection for a Cogeneration System for Geothermal Large Temperature Difference Utilization

Yin,

Zhu,

Zhang

et al. 2024

ACS Omega

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“…where m1-initial mass of the sample before the test, g; m 3 -final sample mass after clean- The corrosion rate K of the condensing surfaces is determined according to the correlation:…”

Section: Experimental Research Of Ltc Intensitymentioning

confidence: 99%

“…where m 1 -initial mass of the sample before the test, g; m 3 -final sample mass after cleaning the products of corrosion and deposits of soot, g; F-the sample outer surface average area, m 2 ; τ-duration of experiment, h. The approximation correlation for the corrosion rate depending on the wall temperature K = f (t w ) at certain times of exposure to exhaust gas was determined based on the test data.…”

Section: Experimental Research Of Ltc Intensitymentioning

confidence: 99%

“…Under these conditions, the construction of decentralized heat supply systems with a total electrical capacity of up to 100-150 MW in new microdistricts of cities in Ukraine becomes relevant. Their construction near consumers will significantly reduce the length of heating networks and heat losses [3,4]. There have been positive experiences regarding decentralized heat supply using combined cycle CPPs [4,5].…”

Section: Introductionmentioning

confidence: 99%

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Enhancing the Fuel Efficiency of Cogeneration Plants by Fuel Oil Afterburning in Exhaust Gas before Boilers

Kornienko,

Radchenko,

Radchenko

et al. 2023

Energies

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Cogeneration or combined heat and power (CHP) has found wide application in various industries because it very effectively meets the growing demand for electricity, steam, hot water, and also has a number of operational, environmental, economic advantages over traditional electrical and thermal systems. Experimental and theoretical investigations of the afterburning of fuel oil in the combustion engine exhaust gas at the boiler inlet were carried out in order to enhance the efficiency of cogeneration power plants; this was achieved by increasing the boiler steam capacity, resulting in reduced production of waste heat and exhaust emissions. The afterburning of fuel oil in the exhaust gas of diesel engines is possible due to a high the excess air ratio (three to four). Based on the experimental data of the low-temperature corrosion of the gas boiler condensing heat exchange surfaces, the admissible values of corrosion rate and the lowest exhaust gas temperature which provide deep exhaust gas heat utilization and high efficiency of the exhaust gas boiler were obtained. The use of WFE and afterburning fuel oil provides an increase in efficiency and power of the CPPs based on diesel engines of up to 5% due to a decrease in the exhaust gas temperature at the outlet of the EGB from 150 °C to 90 °C and waste heat, accordingly. The application of efficient environmentally friendly exhaust gas boilers with low-temperature condensing surfaces can be considered a new and prosperous trend in diesel engine exhaust gas heat utilization through the afterburning of fuel oil and in CPPs as a whole.

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Comparative analysis and optimization of waste-heat recovery systems with large-temperature-gradient heat transfer

Li,

Qian,

Teng

et al. 2023

Applied Thermal Engineering

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Cogeneration system based on large temperature difference heat transfer with stepwise utilization

Cited by 9 publications

References 65 publications

“3E” Analysis and Working Fluid Selection for a Cogeneration System for Geothermal Large Temperature Difference Utilization

“3E” Analysis and Working Fluid Selection for a Cogeneration System for Geothermal Large Temperature Difference Utilization

Enhancing the Fuel Efficiency of Cogeneration Plants by Fuel Oil Afterburning in Exhaust Gas before Boilers

Comparative analysis and optimization of waste-heat recovery systems with large-temperature-gradient heat transfer

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