Problems of operating heating boilers of increased environmental efficiency
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- Category: Content №6 2023
- Last Updated on 23 December 2023
- Published on 30 November -0001
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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.
R.V.Serhiienko, orcid.org/0000-0002-5241-2416, 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.
Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu. 2023, (6): 054 - 060
https://doi.org/10.33271/nvngu/2023-6/054
Abstract:
Purpose. Ensuring reliable operation of heating heat-generating devices with recirculation and exhaust gas heat recovery.
Methodology. The normative methods of thermal calculation for surface heat exchange devices and the software according to the requirements of regulatory methods for this type of equipment for processing the results of our own experimental studies on heat exchange during deep cooling of combustion products of gas-consuming boilers were used.
Findings. Calculation studies on the thermal operation modes during the heating period under the conditions of recirculation and heat recovery of flue gases of gas-fired water-heating boiler plants not equipped with air heaters were carried out. The main characteristics were determined of the thermal and humidity operation state for the air-supply ducts of these installations under the conditions of recirculation of flue gases’ part into the blown air. Regularities of temperature and dew point changes in the mixture of admixed gases and air under the conditions of using traditional heat recovery technologies and without them in different boiler modes and with different parts of recirculated gases were established. Problems of ensuring the operability and reliability of such boiler plants are highlighted. It is shown that these problems are related to condensate formation on the internal surfaces of air ducts and their freezing in some operating modes during in the cold period of the heating season. It is also shown that an effective solution to existing problems can be the use of air heaters in heat recovery systems to preheat the blown air before its mixing with recirculation gases.
Originality. For the first time, the thermal and humidity operation modes of the air-supply ducts of heating boiler plants with increased environmental efficiency, which is ensured by boiler exhaust gases recirculation into the blown air, have been investigated.
Practical value. The obtained research results will be used in the design of systems of recirculation and heat recovery of heat-generating devices’ exhaust gases to improve their environmental and thermal efficiency.
Keywords: nitrogen oxides, exhaust gas recirculation, heat recovery, air-supply channels, thermal and humidity conditions
References.
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2. Energy efficient technologies for nitrogen oxide emission decrease at the power stations and high power boiler plants (n.d.). Retrieved from https://gas-inst.org.ua/2-3-snyzhennya-utvorennya-oksydiv-azotu-v-kotlah.
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7. Fialko, N. M., Gnedash, G. O., Navrodska, R. O., Presich, G. O., & Shevchuk, S. I. (2019). Improving the efficiency of complex heat-recovery systems for gas-fired boiler installations. Scientific Bulletin of UNFU, 29(6), 79-82. https://doi.org/10.15421/40290616.
8. Hlushchenko, O. L., & Bohdanovich, D. V. (2021). Study of operation of the industrial boiler units in order to develop measures to reduce harmful emissions into the environment. Conference Proceedings of the 1st International Conference on Academic Research and Innovation. Dallas, USA, 13–15 January 2021, (pp. 9-17). Retrieved from https://ispic.ngo-seb.com/assets/files/1_conf_13_15.01.2021.pdf.
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10. Fialko, N. M., Navrodska, R. O., Gnedash, G. O., Presich, G. O., & Shevchuk, S. I. (2020). Study of heat-recovery systems for heating and moisturing combustion air of boiler units. Science and innovation, 2(16), 47-53. https://doi.org/10.15407/scin16.03.047.
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