EXPERIMENTAL RESEARCH OF MIXING NATURAL GAS IMPINGING JETS AND AIR DURING COMBUSTION AT A VERTICAL REFRACTORY SURFACE
In the work determined the conditions for the start of chemical reactions of natural gas and air mixture at combustion on a refractory surface, when a single submerged turbulent impinging jet is fed from a natural gas collector at the angle α to the vertical refractory surface, at the relative distance L/d0 along the geometric axis of the jet. It is determined that combustion starts under the condition when the excess air coefficient in the mixture reaches about λ = 0.93, at which the laminar flame propagation velocity S°L, m/s, for a premixed mixture of methane and air is maximum. The dependence of the height of the flame Lf, m, on the relative dimensionless step of the location of the nozzles s/d0 in the row was obtained during studying the groups of gas nozzles with the supply of natural gas for combustion through them range diameters 1–3.5 mm (which are used at precent time in the construction of slot bottom burners). It was determined that the flame height of slot bottom burner during its operation on natural gas (tested for the pressure of natural gas in the collector from 2 kPa to 18 kPa, respectively, natural gas outflow velocity, WNG from about 60 m/s to 185 m/s) depends slightly on gas pressure, the relative distance L/d0 that the aerated jet of natural gas travels to the refractory surface in the range of 15 ≤ L/d0 ≤ 30 and the Reynolds number, and strongly depends from on the dimensionless step of the nozzles in the row — s/d0. It has been experimentally proven that by adjusting the dimensionless step of the nozzles (holes) s/d0 in the row of the slot bottom burner, it is possible to adjust the height of the flame and thus obtain the flame of the appropriate height for different heights of fireboxes and boilers powers. Bibl. 29, Fig. 3, Tab. 3.
BP Statistical Review of World Energy 2022. BP, 71th edition. London, accessed October 27, 2022, from https://www.bp.com/content/dam/bp/business-sites/en/global/corporate/pdfs/energy-economics/statistical-review/bp-stats-review-2022-full-report.pdf, 2022
Rodionov, A.I., Klushin, V.N., and Torocheshnikov, N.S. Technique of Environmental Protection. Moscow: Khimiya, 1989. 512 p. (Rus.)
Thierry Lecomte, José Félix Ferrería de la Fuente, Frederik Neuwahl, Michele Canova, Antoine Pinasseau, Ivan Jankov, Thomas Brinkmann, Serge Roudier, Luis Delgado Sancho. Best Available Techniques (BAT) Reference Document for Large Combustion Plants. Publications Office of the European Union, 2017. 986 p.
Volchyn I.A, Dunayevska N.I., Haponych L.S., Chernyavskyiy M.V., Topal O.I., Zasyadko Ya.I. Prospects for the implementation of clean coal technologies in the energy sector of Ukraine. Кyiv : GNOZIS, 2013. 308 p. (Ukr.)
Sigal I.Ya. Protection of ambient air at fuel burning. Leningrad : Nedra, 1988. 313 p. (Rus.)
Smikhula A.V., Sigal I.Ya., Bondarenko B.I., Semeniuk N.I. Technologies for reduction of harmful emissions to the atmosphere of thermal power plants and boiler-houses of large and medium power of Ukraine. Kyiv: FOP Maslakov, 108 p. (Ukr.)
Communication from the commission to the European parliament, the council, the European economic and social committee and the committee of the regions — Brussels. Energy Roadmap 2050. European Commission. 2011, 15 December. 20 p. — URL: http://eur-lex.europa.eu/legal-content/EN/ALL/?uri=CELEX:52011DC0885
Energy strategy of Ukraine for the period until 2035 “Security, energy efficiency, competitiveness”. Cabinet of Ministers of Ukraine — Law of Ukraine, 18.08.2017. № 605-р. 73 p. — URL: https://zakon.rada.gov.ua/laws/show/605-2017-%D1%80#Text (Ukr.)
EU taxonomy: Complementary Climate Delegated Act to accelerate decarbonization — Brussels. European Commission. 2022, 02 February. 3 p. — URL: https://finance.ec.europa.eu/publications/eu-taxonomy-complementary-climate-delegated-act-accelerate-decarbonisation_en
Directive 2010/75/EU of the European parliament and of the council of 24 November 2010 on industrial emissions (integrated pollution prevention and control). Official Journal of the European Union. 2010. 17 December. 119 p.
National plan to reduce emissions from large combustion plants. Order of the Cabinet of Ministers of Ukraine, 08.11.2017. № 796. 66 p. — URL: https://zakon.rada.gov.ua/laws/show/796-2017-%D1%80#Text (Ukr.)
Directive (EU) 2015/2193 of the European parliament and of the council of 25 November 2015 on the limitation of emissions of certain pollutants into the air from medium combustion plants. Official Journal of the European Union. 2015, 28 November. 19 p.
Meyklyar M.V. Sovremennye kotelnye agregaty TKZ. Moscow : Energiya, 1978. 224 p. (Rus.)
Sigal I.Ya., Lavrentsov E.M., Kosinov O.I, Dombrovskaya E.P. Gas-fired heat-water supply industrial boilers. Kyiv : Tekhnika, 1967. 145 p. (Rus.)
Fedorov V.N. Investigation of mixture formation and aerodynamic drag processes in slot diffusion gas burners : Abstract of the dissertation. Kuibyshev : Kuibyshev Polytechnic Institute, 1969. 26 p. (Rus.)
Mikheev V.P., Fedorov V.P. Bottom slot burners for natural gas. Leningrad : Nedra, 1965. 74 p. (Rus.)
Lavrentsov E.M., Sigal I.Ya., Smikhula A.V., Dombrowska E.P., Kernazhytska E.S., Marasin O.V. Experience of development, implementation and modernization of hot water supply boilers with dual-screens and the slot bottom burners. Energy Technologies and Resource Saving. 2019. No. 3. pp. 17–26. DOI: 10.33070/etars.3.2019.02. (Ukr.)
Kosinov O.I. Investigation of the influence of heat transfer intensification on the formation of nitrogen oxides in boiler furnaces : Abstract of the dissertation. Kyiv : The Gas Institute of NASU, 1975. 27 p. (Rus.)
Smikhula A.V. Development and research of power bottom slot burners for tower hot water boilers : Abstract of the dissertation. Kyiv : The Gas Institute of NASU, 2007. 20 p. (Ukr.)
Sigal I.Ya., Smikhula A.V., Sigal O.I., Marasin O.V. Combustion Research of Impinging Gas Jets at Stabilization of the Flame Front on a Vertical Surface. Energy Technologies and Resource Saving. 2020. No. 4. pp. 29–38. DOI: 10.33070/etars.4.2020.03. (Ukr.)
Hagihara, Y., Yamamoto, Y., Numata, M., Matsuda, T. Development of Impinging Jet Burner Using Ammonia Fuel for Degreasing Steel Sheets. In: Aika, Ki., Kobayashi, H. (eds). CO2 Free Ammonia as an Energy Carrier. Singapore : Springer, 2023. pp. 641–651 DOI: 10.1007/978-981-19-4767-4_45.
Kuntikana, P., Prabhu, S.V. Impinging premixed methane-air flame jet of tube burner: thermal performance analysis for varied equivalence ratios. Heat Mass Transfer. 2019. 55. pp. 1301–1315. DOI: 10.1007/s00231-018-2507-z.
Loreto Pizzuti, Cristiane A. Martins, Leila R.dos Santos, Danielle R.S. Guerra. Laminar Burning Velocity of Methane. Air Mixtures and Flame Propagation Speed Close to the Chamber Wall. Energy Procedia, 11th European Conference on Industrial Furnaces and Boilers, INFUB-11. 2017. 120. pp. 126–133. DOI: 10.1016/j.egypro.2017.07.145.
Shchelkin K.I. Combustion Theory and Gas Detonation. Mechanics in the USSR for 50 Years. Moscow : Nauka, 1970. 2. pp. 343–422. (Rus.)
Abramovich G.N., Krasheninnikov S.Yu., Sekundov A.N., Smirnova I.P. Turbulent Mixing of Gas Jets. Moscow : Nauka, 1974. 272 p. (Rus.)
Ricou, F.P. & Spalding, D.B. Measurements of entrainment by axisymmetrical turbulent jets. Journal of Fluid Mechanics. 1961. 11. pp. 21–32. DOI: 10.1017/S0022112061000834.
Bloch A.G. Fundamentals of heat transfer by radiation. Moscow; Leningrad : Gosenergoizdat, 1962. 332 p. (Rus.)
Abryutin A.A., Krasina E.S., Petrosyan R.A., Fomina V.N., Bloch A.G., Mochan S.I., Nazarenko V.S., Chavchanidze E.K. Thermal Calculation of Boilers: Normative Method. St-Peterburg : NPO CKTI, 1998. 256 p. (Rus.)
Sigal I.Ya., Smikhula A.V., Marasin O.V., Gurevich M.O., Lavrentsov E.M. Methods to reduce NOx formation during gas combustion in boilers. Energy Technologies and Resource Saving. 2022. No. 4. pp. 62–72. DOI: 10.33070/etars.4.2022.06.
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