RESEARCH COMBUSTION EFFICIENCY OF UNPROJECTED COAL

Coal combustion remains an important source of energy despite its environmental disadvantages. This paper investigates the efficiency of combustion of non-project coal of D grade from Karazhyra mine at CHPP-1 of Semey city. The purpose of the study is to optimize the combustion processes to improve the efficiency of boiler E-90-3,9/440. The research method includes experimental-theoretical approach, with an emphasis on drawing up the heat balance and calculating the coefficient of performance (COP) by the inverse balance method.
The analysis of the obtained data shows that with increasing the heat output of the boiler there is a parallel growth of fuel consumption and efficiency, indicating an improvement in the efficiency of the boiler unit. It is revealed that when reaching the heat output of 220 GJ/h there is a significant jump in efficiency, indicating the transition of the boiler to a more optimal mode. This result confirms not only the significant potential for improving energy efficiency, but also the stability of fuel costs at changing loads on the boiler unit.
Thus, optimization of combustion processes of non-project D grade coal is an important step to reduce negative environmental impact and improve energy efficiency. Further research in this area may lead to even more significant improvements in the operation of boiler units and reduction of harmful emissions.

1. Chislennoe issledovanie topochnykh protsessov pri szhiganii neproektnykh uglei v kotle proizvoditel'nost'yu 220 t/ch / K.I. Mal'tsev i dr. // Teploehnergetika. – 2022. – № 12. – S. 73-83. DOI: https://doi.org/10.56304/S0040363622110042. (In Russian).

2. Problemy perevoda ugol'nykh TEHTS na neproektnye topliva / A.I. Matyushenko i dr. // Promyshlennaya ehnergetika. – 2022. – № 4. – S. 36-43. DOI: https://doi.org/10.34831/EP.2022.10.67.005. (In Russian).

3. K voprosu ehffektivnogo szhiganiya neproektnogo topliva uglya razreza Karazhyra / A.R. Khazhidinova i dr. // Vestnik NYATS RK. – 2023. № 2. – S. 58-65. DOI: https://doi.org/10.52676/1729-7885-2023-2-58-65. (In Russian).

4. Analiz ehffektivnosti raboty kotel'nykh agregatov pri rabote na neproektnom toplive / A.E. Meiіrkhanova i dr. // Ehnergetika i ehnergosberezhenie: teoriya i praktika: Sbornik materialov V Vserossiiskoi nauchno-prakticheskoi konferentsii, Kemerovo, 16–17 dekabrya 2020 goda. – Kemerovo: Kuzbasskii gosudarstvennyi tekhnicheskii universitet imeni T.F. Gorbacheva, 2020. – S.124-1–124-4. (In Russian).

5. Bektemisov A.A. Vliyanie teploproizvoditel'nosti kotel'nogo agregata na koehffitsient izbytka vozdukha v vikhrevoi zone topki / A.A. Bektemisov, A. Manulenko // Ehnergiya-2021: Shestnadtsataya vserossiiskaya (vos'maya mezhdunarodnaya) nauchno-tekhnicheskaya konferentsiya studentov, aspirantov i molodykh uchenykh. V 6 t., Ivanovo, 06–08 aprelya 2021 goda. Tom 1. – Ivanovo: Ivanovskii gosudarstvennyi ehnergetich. univ-t im. V.I. Lenina, 2021. – S. 7. (In Russian).

6. Protsessy szhiganiya v kamernoi topke s tangentsial'no zakruchennym vikhrem / A.V. Gil' i dr. // Izvestiya Tomskogo politekhnicheskogo universiteta. Inzhiniring georesursov. –2024. –T. 335, № 2. – S. 7-16. DOI: https://doi.org/10.18799/24131830/2024/2/4475. (In Russian).

7. Mochalov, D.YU. Perevod kotla TPE-215 Khabarovskoi TEHTS na neproektnyi ugol' / D.YU. Mochalov // Radioehlektronika, ehlektrotekhnika i ehnergetika: Tezisy dokladov Dvadtsat' devyatoi Mezhdunarodnoi nauchno-tekhnicheskoi konferentsii studentov i aspirantov, Moskva, 16-18 marta 2023 goda. – Moskva: OOO Tsentr poligraficheskikh uslug «RADUGA», 2023. – S. 985. (In Russian).

8. Investigation into the Influence of Temperature on the Formation of Nitrogen Oxides during the Staged Combustion of Low-Reactive Coal with the Use of Direct-Flow Burners / V. Prokhorov et al // Therm. Eng. – 2023. – № 70. – R. 711-718. DOI: https://doi.org/10.1134/S0040601523090057. (In English).

9. Influence of combustion system retrofit on NOx formation characteristics in 300 MWe tangentially fired furnace / L. Shi et al // Wang, Appl. Therm. Eng. – 2016. – № 98. – R. 766-777. 10. Influence of increased primary air ratio on boiler performance in a 660 MW brown coal boiler / Z. Li et al // Energy/ – 2018. – № 152. R. 804-817. (In English).

10. Teplovoi poverochnyi raschet parovykh kotlov na PEHVM: metodicheskie ukazaniya / sostaviteli B.L. Shelygin [i dr.]. – Ivanovo: IGEHU, 2021. – 44 s. (In Russian).