Efficient Combustion of the Fixed Coal Layer in an Advanced Combustion Chamber Design for Low-Power Boilers

Abstract

In the long term, coal will remain a competitive resource in the thermal power sector, primarily due to its abundant global reserves and low costs. Despite numerous factors, including significant environmental concerns, the global share of coal power generation has remained at 40% over the past four decades. Efficient and clean coal combustion is a high priority wherever coal is used as a fuel. An improved low-power boiler design has been proposed to enhance efficiency during fixed-bed coal combustion. This design reduces harmful emissions into the atmosphere by optimizing parameters and operating modes. In this study, mathematical modeling of gas velocity and temperature distribution during fixed-bed coal combustion was conducted for a conventional grate system and an improved grate-free system. Experimental methods were employed to develop descriptive airflow models in the fixed coal layer, considering nozzle diameter and air supply pressure in the furnace chamber without a grate system. Comparative evaluations of fixed-bed coal combustion rates were performed using an experimental laboratory setup with both grate and grate-free stove systems.

References

[1.] KalybayAA. About the program of transition to low-carbon fuels in the power industry of the Republic of Kazakhstan. Combust Plasmochem, 2021, 19: 223-235

[2.] JacobsonMZ. Review of solutions to global warming, air pollution, and energy security. Energy Environ Sci, 2009, 2(2): 148-173

[3.] News. Global energy consumption and greenhouse gas emissions are rising. E²nergy Energy media. 2019. https://eenergy.media/2019/04/01/v-mire-rastut-potreblenie-energii-i-vybrosy-parnikovyh-gazov-mea. Accessed 17 September 2023

[4.] Tengrinews. Coal industry in search of growth points. Strategy 2050 kz. 2021. https://strategy2050.kz/ru/news/ugolnaya-promyshlennost-v-poiskakh-tochek-rosta/ . Accessed 23 September 2023

[5.] Akhunbaev A. State and prospects of the coal industry in Kazakhstan. Eurasian Development Bank Mining and Metall Industry 8: 2017. https://eabr.org/press/news/sostoyanie-i-perspektivy-ugolnoy-promyshlennosti-kazakhstana. Accessed 05 October 2023

[6.] KarenovRS. Problems of development of the Karaganda basin in conditions of market relations. Integr Use of Mineral Raw Mater, 1994, 4: 73-77

[7.] KarenovRS. Mineral resources complex of Kazakhstan in a market economy, 2000 Almaty, KZ RIO—VAK Publishing

[8.] SigalIYa. Air protection during fuel combustion, 1988 Leningrad, USSR Nedra

[9.] Alifirova E, Bakhtina O. Gasification of Eastern Kazakhstan can be carried out through a gas pipeline from Russia. Neftegaz. 2020. https://neftegaz.ru/news/gazoraspredelenie/651160-gazifikatsiya-vostochnogo-kazakhstana-mozhet-byt-osushchestvlena-za-schet-gazoprovoda-iz-rossii-no-n/. Accessed November 24, 2023

[10.] UshakovVYa, KharlovNN, ChubikPS. Energy saving potential and its implementation at fuel and energy complex enterprises, 2015 Tomsk, RF TPU Publishing House

[11.] MartynovAV, YanovAV, GolovkoVM. Decentralized heat supply system based on an autonomous heat generator. Construct Mater, Equip, Technol XXI Century, 2003, 11: 36-38

[12.] FilippovSP, NaumovYuV, ErmakovMV. The influence of air suction on the productivity and thermal efficiency of layer boilers. Therm Power Eng, 2005, 2: 116-121

[13.] WuY, ZhangJ, SmithPJ, et al. . Three-dimensional simulation for an entrained flow coal slurry gasifier. Energy Fuels, 2010, 24(2): 1156-1163

[14.] YuxinW, PhilipJ, JianshengZh. Effects of turbulent mixing and controlling mechanisms in an entrained flow coal gasifier. Energy Fuels, 2009, 24(2): 11701175

[15.] ParenteA, SutherlandJC, TognottiL, et al. . Identification of low-dimensional manifolds in turbulent flames. Proc Combust Inst, 2009, 32(1): 1579-1586

[16.] KotlerVR, BelikovSE. Industrial heating boiler houses: combustion of fuels and protection of the atmosphere, 2001 Saint Petersburg, RF Energotekh

[17.] RoslyakovPV, IzyumovMA. Environmentally friendly technologies for using coal at thermal power plants: textbook, 2003 Moskow, RF Manual MPEI Publishing House

[18.] Khazimov MZh, Urmashev BA, Idrishev KZh, et al. Hot-water solid fuel boiler. KZ. Patent 3368. 2018.

[19.] Khazimov MZh, Berdimurat AD, Kudasheva AB, et al. Low-power industrial water heating boiler. KZ. Patent 35521. 2022

[20.] Kudasheva AB, Khazimov MZ. Reduction of harmful emissions in water heating solid fuel boilers of low power КVTS-0.2. AIP Conference Proceedings, III International scientific forum on computer and energy sciences (WFCES 2022). Almaty, Kazakhstan. AIP Publishing, 2023;2812(1): 020028.

[21.] Dauletzhanova ZhT. Study of ways to improve the quality characteristics of coal from the Shubarkol deposit. Dissertation. Karaganda Technical University, Karaganda, KZ. 2021. https://www.kstu.kz/wp-content/uploads/2021/11/Dissertatsiya-Dauletzhanovoj-ZH.T..pdf

[22.] SHUBARKOL KOMIR. Doing business responsibly in difficult times. Report for 2020. 2020.https://kase.kz/files/emitters/SHUK/shukp_2020_rus.pdf

[23.] MenterFR. Two-equation eddy-viscosity turbulence models for engineering applications. AIAA J, 1994, 32(8): 1598-1605

[24.] ChoubeyG, PandeyKM. Effect of variation of angle of attack on the performance of two-strut scramjet combustor. Int J of Hydrog Energy, 2016, 41(26): 11455-11470

[25.] PatankarSV, SpaldingDB. A calculation procedure for heat, mass and momentum transfer in three-dimensional parabolic flows. Int J of Heat and Mass Transfer, 1972, 15(10): 1787-1806

[26.] ChangWJ, YangDF. Natural convection for the melting of ice in porous media in a rectangular enclosure. Int J of Heat and Mass Transfer, 1996, 39(11): 2333-2348

[27.] Testo SE, Co. KGaA. Gas analyzer testo-300/testo-300LL. Operating manual. 2019. https://beltesto.by/images/downloads/testo_300-300LL_2019.pdf

[28.] GOST. Solid fuel. Sieve method for determining particle size distribution. Standart 2093–82. 1983.

[29.] MalikMR, IsaacBJ, CoussementA, et al. . Principal component analysis coupled with nonlinear regression for chemistry reduction. Combust Flame, 2018, 187: 30-41

[30.] PedelJ, ThornockJN, SmithPJ. Large eddy simulation of pulverized coal jet flame ignition using the direct quadrature method of moments. Energy Fuels, 2012, 26(11): 6686-6694

[31.] https://autokotly.com/almaty/gornyak.html

[32.] ITS Combustion of fuel in large installations for the purpose of energy production. Information and technical reference book. Bureau of NDT, Moscow, RF. 2017. https://b.twirpx.link/file/2450851/