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New complex heat-recovery systems of environmentally efficient boiler installations

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Parent Category: 2025

Category: Content №3 2025

Created on 25 June 2025

Last Updated on 25 June 2025

Published on 30 November -0001

Written by N. M. Fialko, R. O. Navrodska, S. I. Shevchuk, G. O. Gnedash

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Authors:

N.M.Fialko, orcid.org/0000-0003-0116-7673, Institute of Engineering Thermophysics of National Academy of Sciences of Ukraine, Kyiv, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

R.O.Navrodska*, orcid.org/0000-0001-7476-2962, Institute of Engineering Thermophysics of National Academy of Sciences of Ukraine, Kyiv, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

S.I.Shevchuk, orcid.org/0000-0001-8046-0039, Institute of Engineering Thermophysics of National Academy of Sciences of Ukraine, Kyiv, Ukraine, e-mail:  This email address is being protected from spambots. You need JavaScript enabled to view it.

G.O.Gnedash, orcid.org/0000-0003-0395-9615, Institute of Engineering Thermophysics of National Academy of Sciences of Ukraine, Kyiv, Ukraine, e-mail:  This email address is being protected from spambots. You need JavaScript enabled to view it.

* Corresponding author e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

повний текст / full article

Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu. 2025, (3): 139 - 146

https://doi.org/10.33271/nvngu/2025-3/139

Abstract:

Purpose. To establish the effectiveness of the proposed new technical solution of a small-sized and low-metal combined heat-recovery units for gas-consuming environmentally efficient heating boilers.

Methodology. Known methods of thermal calculation of boiler plants and experimental research data obtained by the authors were used.

Findings. A schematic circuit of a boiler plant with gas recirculation and a new complex heat-recovery system designed for heating such heat-transfer agents as heat network water and combustion air is proposed for the beneficial use of flue gas waste heat. Calculation studies on the main indicators of the thermal efficiency of the specified system and the heat-humidity condition in the air ducts of the boiler plant in different modes of its operation were performed. It is shown that the use of the proposed system ensures an increase in the efficiency of the boiler and the absence of condensation in the specified ducts. The indicators of the relative metal content of the considered heat-recovery exchangers were also obtained. A comparison of the calculated indicators with the corresponding indicators for the known heat-recovery system with heating of the specified heat-transfer agents was performed. The research results show that the new system with a water-heating air heater is characterized by a significantly lower relative metal capacity of this system equipped with a gas-heating air heater. Due to the use of a developed heating surface in it, the proposed water-heating air heater is low in metal consumption and highly compact, which is essential in its design and manufacture, as well as placement in the compressed conditions of boiler houses.

Originality. For the first time, the effectiveness of a new complex heat-recovery system for heating boiler installations of increased environmental efficiency was proposed and investigated.

Practical value. The obtained research results will be used to improve the environmental and thermal characteristics of boiler plants.

Keywords: heat recovery, heating of water, combustion air, waste gas recirculation

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