CHALLENGES AND OPPORTUNITIES OF UTILIZATION OF ASH AND SLAG WASTE OF TPP (THERMAL POWER PLANT). PART 2

For existing and already constructed coal TPP plants, known methods of utilization of fly ash and slag wastes (FASW) may be in de­mand when all emerging environmental and economic risks are taken into account. But for the new power generating source when choosing coal combustion technology, it is necessary to increase the significance of the environmental component of the project more essentially. It is known that the most promising technologies for coal combustion, which increase environmental safety exactly by burning, are technolo­gies based on a circulating fluidized bed. These technologies can sig­nificantly reduce sulfur and nitrogen oxide emissions behind the boiler, but the solution to the problem of flay ash and slag waste remains at the same level. It is proposed to solve the problem of FASW utilization during the implementation of new energy projects or when replacing the decommissioning capacities of coal generation by replacing the method of coal combustion in a stream or fluidized bed with meth­ods of burning solid fuel in a bubbling slag melt. The descriptions and schemes of these methods are given. The comparison of the main qual­itative technical and ecological parameters of pulverized coal combus­tion and technologies of coal combustion in slag melt is presented. The development of coal generation is expected in two main areas: coal combustion with increasing steam parameters and gas generation with a combined cycle of electricity generation: steam and gas, based on the gasification of solid fuels. These directions will allow achieving electric efficiency of steam-power plants from 30 – 36 %, up to 44 – 45 % on supercritical steam parameters, and using a combined steam-gas cycle up to 50 – 55 %. A technological scheme of gasification of coal in a slag melt is proposed, which increases the electrical efficiency of the installation. The ecological and economic efficiency of the gasifica­tion method for solid fuel and the simplicity of the production of slag products by casting are shown. The quality of cast slagstone products is much higher than similar cement-sand products with the addition of fly ash, and the ease of transition from one casting mold to another allows quickly responding to market demands.  

1. Podgorodetskii G.S., Gorbunov V.B., Agapov E.A., Erokhov T.V., Kozlova O.N. Challenges and opportunities utilization of ash and slag waste of TPP (thermal power plant). Part 1. Izvestiya VUZov. Chernaya metallurgiya = Izvestiya. Ferrous Metallurgy. 2018, vol. 61, no. 6, pp. 439–446. (In Russ.).

2. Rodionov V.G. Energetika: problemy nastoyashchego i vozmozh¬nosti budushchego [Electric power industry: challenges of the present and opportunities for the future]. Moscow: ENAS, 2010, 352 p. (In Russ.).

3. Ryabov G.A. Prospects for mastering the technology of coal combustion in the circulating fluidized bed at Russian coal TPP. In: Mezhdunarodnaya nauchno-prakticheskaya konferentsiya “Ugol’Eko-2016” TES 27–28 sentyabrya 2016 goda, MEI, g. Mosk¬va [Int. Sci. and Pract. Conf. “Ugol’Eco-2016” TPP, September 27-28, 2016, MPEI, Moscow]. Electronic resource. Available at URL: http://coaleco.ru/wp-content/uploads/2016/10/3-RyabovVTI-Coaleco2016.pdf. (Accessed 16.04. 2018). (In Russ.).

4. Ryabov G.A., Tolchinskii E.N., Nadyrov I.I., Folomeev O.M., Trukhachev S.N., Shaposhnik D.A. Using boilers with a circulating fluidized bed to replace old pulverized-coal boilers. Thermal Engi¬neering. 2000, vol. 48, no. 8, pp. 679–686.

5. Goral A.D. Lagisza 460 MWe Supercritical CFB. Design, start-up and initial operation experience. Foster Wheeler Energia Polska. Presentation. Coal-Gen Europe. Septetember 1 – 4, 2009. Katowice, Poland, 2009.

6. Vanyukov A.B., Bystrov V.P., Vaskevich A.D. Plavka v zhidkoi vanne [Melting in liquid bath]. Moscow: Metallurgiya, 1988, 208 p. (In Russ.).

7. Protsess Romelt [Romelt process]. Roments V.A. ed. Moscow: MISiS, ID Ruda i metally, 2005, 400 p. (In Russ.).

8. D’yakov A.F., Madoyan A.A., Dobrokhotov V.I., Levchenko G.I., Kushnarev F.A., Khristich L.M. New approaches to using solid fuel in the electric power industry. Thermal Engineering. 1998, vol. 45, no. 2, pp. 103–108.

9. Balasanov A.V., Lekherzak V.E., Romenets V.A. Gazifikatsiya ug¬lya v shlakovom rasplave: Monografiya [Coal gasification in slag melt: Monograph]. Moscow: Institut Stal’proekt, 2008, 288 p. (In Russ.).

10. Komkov A.A., Balasanov A.V., Dityatovskii L.I. etc. Pyrometal¬lurgical technology as an effective method of ash and slag waste disposal and waste-free combustion of various types of solid fuel. Ugol’. 2013, no. 9 (1050), pp. 65–70. (In Russ.).

11. Garber V., Serat M. Energy boiler with coal combustion in a bub¬bling slag melt. In: Mezhdunarodnaya nauchno-prakticheskaya konferentsiya “Ugol’Eko-2016”, 27 – 28 sentyabrya 2016 goda, MEI, g. Moskva [Int. Sci. and Pract. Conf. “Ugol’Eco-2016” TPP, September 27-28, 2016, MPEI, Moscow]. Electronic resource. Available at URL: http://coaleco.ru/news/coaleco-2016-presenta¬tions/ (Accessed 16.04. 2018). (In Russ.).

12. Valavin V.S., Romenets V.A., Pokhvisnev Yu.V., Makeev S.A. etc. Technical and design solutions for the injection of pulverized coal (PUT) into the slag bath of the Romelt furnace. In: Trudy shestoi mezhdunarodnoi nauchno-prakticheskoi konferentsii “Energos-beregayushchie tekhnologii v promyshlennosti. Pechnye agregaty. Ekologiya” [Proceedings of the Sixth Int. Sci. and Pract. Conf. “Energy Saving Technologies in Industry. Furnace aggregates. Ecology”]. Moscow: MISiS, 2012, pp. 77–85. (In Russ.).

13. Tumanovskii A.G. Prospects for the development of coal-steam plants in Russia. Teploenergetika. 2017, vol. 64, no. 6, pp. 399–407.

14. Slavinskaya L. Coal gasification: world trends. Neftegazovaya ver¬tikal’. 2011, no. 18, pp. 13–16. (In Russ.).

15. Innovatsionnye proekty v rossiiskoi energetike. Fond “Energiya bez granits” [Innovative projects in the Russian energy sector. Founda¬tion “Energy without Borders”]. Electronic resource. Available at URL: http://energy-fund.ru/upload/docs/Fond_EHnergiya_Buklet. pdf. (Accessed 04.04. 2018). (In Russ.).

16. Kozhukhovskii I.S., Aleshinskii R.E., Govsievich E.R. Challeng¬es and prospects of coal generation in Russia. Ugol’. 2016, no. 2, pp. 4–15. (In Russ.).

17. Podgorodetskii G.S., Yusfin Yu.S., Sazhin A.Yu., Gorbunov V.B., Polulyakh L.A. Manufacturing trends of generator gases from dif¬ferent types of solid fuel. Izvestiya VUZov. Chernaya metallurgiya = Izvestiya. Ferrous Metallurgy. 2015, vol. 58, no. 6, pp. 393–401. (In Russ.).

18. Gusev K.P., Larichkin V.V., Larichkina N.I. Prospects of using the ashes waste from Siberia power system in manufacture the paving tile. Izvestiya Samarskogo nauchnogo tsentra RAN. 2011, vol. 13, no. 1, pp. 2058–2061. (In Russ.).

19. Stroitel’stvo TETs v g. Sovetskaya Gavan’ Khabarovskogo kraya. Proektnaya dokumentatsiya. Razdel 12. Podrazdel 3: Otsenka voz¬deistviya ob”ekta na okruzhayushchuyu sredu [Construction of a TPP plant in Sovetskaya Gavan, Khabarovsk Territory. Project documentation. Section 12. Subsection 3. Assessment of the impact of the facility on the environment]. Irkutsk: SibVNIPIenergoprom. Irkutskii filial, 2012. (In Russ.).

20. Postanovlenie Pravitel’stva RF ot 13 sentyabrya 2016 g. № 913 “O stavkakh platy za negativnoe vozdeistvie na okruzhayushchuyu sredu i dopolnitel’nykh koeffitsientakh” [Resolution of the Govern¬ment of the Russian Federation of September 13, 2016 No. 913 “On rates of payment for the negative impact on environment and ad¬ditional coefficients”].