An analysis of coal and coal mine methane co-combustion in an 140 t/h pulverized coal boiler

• Autorzy: Jagodzińska K. , Hernik B. , Pronobis M.
• Języki publikacji: EN

Abstrakty

EN

The paper presents an attempt to evaluate the impact of coal and coal mine methane cocombustion on the physics of the heat exchange in an 140 t/h pulverized-coal boiler through an analysis of 21 combinations of the boiler operating parameters – three different boiler loads (50, 75, and 100%) and seven values of the fired gas thermal contribution (0–60%). The obtained results are the temperature distribution of flue gas and steam in the boiler characteristic points, the heat transfer coefficient values for the boiler individual elements expressing the nature of changes in the heat transfer and the change in the boiler efficiency depending on how much gas is actually fired. An increase in the amount of co-fired gas involves a temperature increase along the flue gas path. This is the effect of the reduction in the amount of heat collected by the evaporator in the furnace. For these reason, the flue gas temperature at the furnace outlet rises by 9 K on average per a 0.1 increment in the fired gas thermal contribution. The temperature rise improves the heat transfer in the boiler heat exchangers – for the first- and the secondstage superheater the improvement totals 2.8% at a 10 pp. increase in the fired gas thermal contribution. However, the rise in the flue gas temperature at the boiler outlet involves a drop in the boiler efficiency (by 0.13 pp. for a rise in the fired gas thermal contribution by 0.1).

Słowa kluczowe

EN

Co-combustion; methane; heat transfer; power boiler

• Wydawca: Wydawnictwo Instytutu Maszyn Przepływowych PAN
• Czasopismo: Transactions of the Institute of Fluid-Flow Machinery
• Rocznik: 2017
• Tom: nr 137
• Strony: 3--18
• Opis fizyczny: Bibliogr. 14 poz., rys., tab.

Twórcy

autor

Jagodzińska K.

• Division of Boilers and Steam Generators, Institute of Power Engineering and Turbomachinery, Silesian University of Technology, Konarskiego 20, 44-100 Gliwice, Poland

autor

Hernik B.

• Division of Boilers and Steam Generators, Institute of Power Engineering and Turbomachinery, Silesian University of Technology, Konarskiego 20, 44-100 Gliwice, Poland

autor

Pronobis M.

• Division of Boilers and Steam Generators, Institute of Power Engineering and Turbomachinery, Silesian University of Technology, Konarskiego 20, 44-100 Gliwice, Poland

Bibliografia

• [1] Badyda K.: Possibilities of mine gas utilization for power purposes in Poland. Energetyka 648(2008), 6, 416–423 (in Polish).
• [2] Li G.: Theoretical research and practice on coal mine methane extraction and ground development design. Procedia Earth Planetary Sci. 1(2009), 94–99.
• [3] Karacan C. O., Ruiz F. A., Cote Michael, Phipps S.: Coal mine methane: A review of capture and utilization practices with benefits to mining safety and to greenhouse gas reduction. Int. J. Coal Geol. 86(2011), 121–156.
• [4] U.S. Environmental Protection Agency, Coal Mine Methane Recovery: A Primer. (2009).
• [5] Su S., Beath A., Guo H., Mallett C.: An assessment of mine methane mitigation and utilization technologies. Prog. Energ. Combust. 31(2005), 123–170.
• [6] Gosiewski K., Pawlaczyk A., Jaschnik M.: Combustion of coal-mine ventilation air methane in a thermal flow reversal reactor. Przemysł Chemiczny (2011), 90/10, 1917–1923.
• [7] Nawrat S., Napieraj S.: An analysis of the possibility of utilization of ventilation air methane from the hard coal mine shafts in Poland. Bezpieczeństwo Pracy i Ochrona Środowiska w Górnictwie (2010), 9, 22–29 (in Polish).
• [8] Cheng Y., Wang L., Zhang X.: Environmental impact of coal mine methane emissions and responding strategies in China. Int. J. Greenh. Gas Con. 5(2011), 157–166.
• [9] Ostrowski P., Pronobis M., Remiorz L.: Mine emissions reduction installations. Appl. Thermal Eng. 84(2015), 390–398.
• [10] Dors M.: Towards clean energy production. Trans. Inst. Fluid-Flow Mach. 127(2015), 91– 116.
• [11] Gatnar K.: Economic utilization of coal bed methane on the example of the Jastrzębie Coal Company solutions. In: Proc. 23rd Conf. ‘Issues of energy resources and of energy in Polish economy’, Zakopane, 11–14 Oct. 2009 (in Polish).
• [12] Orłowski P., Dobrzański W., Szwarc E.: Steam Boilers. WNT, Warszawa 1979 (in Polish).
• [13] Kuznetsov N.W., Nitor W.W., Dubovski I.E., Karasina E.S.: Thermal Calculations of Steam Boilers. Standard Method. Energia, Moscow 1973 (in Russian).
• [14] Pronobis M.: Heat exchange in the boiler convection surfaces with fouling. Zeszyty Naukowe Politechniki Śląskiej, ser.: Energetyka, 115, Gliwice 1992 (in Polish).