Justification of efficiency of plain shaped heat exchange surfaces to increase the compactness of power plants

Kuznetsov, Valerii

doi:10.15587/1729-4061.2020.214829

Cited by 3 publications

(2 citation statements)

References 9 publications

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“…Under "real" conditions, we considered the recuperative tubular-rib cross-flow heat exchangers [49] with flat-wool tubes, such as those used in the works of [50][51][52], finned elliptical tubes [53], and compact and hybrid with different working fluids heat exchangers [54][55][56].…”

Section: Resultsmentioning

confidence: 99%

Improving Thermoacoustic Low-Temperature Heat Recovery Systems

et al. 2022

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The existence and development of modern society require significant amounts of available energy. Combustion engines are the main sources of heat. Their operation is accompanied by the formation of large volumes of emissions, which have different temperatures and contain harmful substances ejected into the environment. Therefore, the urgent problem today is the reduction in heat emissions. This might be achieved through a reduction in the amount of these pollutants by improving primary heat engines, converting to new, alternative types of fuel, and at the same time, to carbon-free fuel. However, such measures only reduce the temperature level of waste heat but not its volume. Conventional technologies for the utilization of heat emissions are ineffective for using heat with temperatures below 500 K. Thermoacoustic technologies can be used to convert such low-temperature heat emissions into mechanical work or electricity. This article is focused on analyzing the possibilities of improving the thermoacoustic engines of energy-saving systems through the rational organization of thermoacoustic energy conversion processes. An original mathematical model of energy exchange between the internal elements of thermoacoustic engines is developed. It is shown that the use of recuperative heat exchangers in thermoacoustic engines leads to a decrease in their efficiency by 10–30%. From the research results, new methods of increasing the efficiency of low-temperature engines of energy-saving systems are proposed.

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Section: Resultsmentioning

confidence: 99%

Improving Thermoacoustic Low-Temperature Heat Recovery Systems

et al. 2022

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“…Flue gas dew point temperature is defined as the maximum wall temperature of the HES at which sulfuric acid vapor condenses [17]. Acid vapors also condense in the gas flow on the surface of ash particles [18,19], which then settle on the surface and increase the thermal resistance of the pollution layer [20,21] and the aerodynamic resistance of the gas flow [22] in the EGB, thus affecting its economical operation [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

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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Increasing the Economic Efficiency of Marine Power Plants Using Waste Heat Boilers with Controlled Flow Separation

Kuznetsov,

Kuznetsova

2024

Polish Maritime Research

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Heat recovery of exhaust gases from main and auxiliary marine diesel engines is an effective way to improve the technical and economic parameters of marine power plants. Improvements in engine efficiency necessitate an increase in the weight-size parameters of the waste heat boilers, which makes it difficult to recover heat. Intensification of the heat transfer process is considered to be an effective way to reduce these indicators. By utilising mathematical modelling, this paper shows the effectiveness of using profiled heating surfaces of waste heat boilers for this purpose. The use of elliptical heating surfaces with a mechanism of controlled flow separation, in the form of a triangular notch, is proposed. This will reduce surface drag and increase the overall thermal-hydraulic efficiency of the heat transfer processes. It is shown that the use of such surfaces in waste heat boilers makes it possible to increase the efficiency of marine power plants in tankers with a deadweight of about 45,500 tons up to 1.5% absolute and container ships with a deadweight of about 122,000 tons up to 2.5% absolute.

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Justification of efficiency of plain shaped heat exchange surfaces to increase the compactness of power plants

Cited by 3 publications

References 9 publications

Improving Thermoacoustic Low-Temperature Heat Recovery Systems

Improving Thermoacoustic Low-Temperature Heat Recovery Systems

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

Increasing the Economic Efficiency of Marine Power Plants Using Waste Heat Boilers with Controlled Flow Separation

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