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

A. B. Kudasheva; M. Zh. Khazimov; A. K. Niyazbayev; A. A. Tursynzhanova; A. B. Borsikbayeva; B. A. Urmashev; V. D. Gorburov; K. M. Khazimov

doi:10.1007/s12209-024-00415-z

Transactions of Tianjin University ›› 2024, Vol. 30 ›› Issue (6) : 471 -487. DOI: 10.1007/s12209-024-00415-z

Research Article

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

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¹ The Institute of Combustion Problems, 050000, Almaty, Kazakhstan

² The Almaty University of Power Engineering and Telecommunications, 050013, Almaty, Kazakhstan

³ Kazakh National Agrarian Research University, 050010, Almaty, Kazakhstan

⁴ Kazakh—British Technical University, 050005, Almaty, Kazakhstan

⁵ Al-Farabi Kazakh National University, 050038, Almaty, Kazakhstan

⁶ Moscow Power Engineering Institute, National Research University, 111250, Moscow, Russia

⁷ Suleyman Demirel University, 040900, Kaskelen, Kazakhstan

^b mkhazimov@gmail.com

M. Zh. Khazimov

Marat received his qualifications: engineer-mechanic in the Kazakh State Agricultural Institute (1980); mathematics in the Kazakh State University (1991). The candidate’s degree of technical sciences was obtained at the Ryazan Agricultural University of the Russian Federation (1987). He is a professor of the Department of Machinery Use named after Ivan V. Sakharov of Kazakh National Agrarian Research University and professor of the Department Heat and Power Engineering at the Almaty University of Power Engineering and Telecommunications. His research interests are focused on the heat exchange processes of drying agricultural products and solid-fuel combustion in a stationary layer in small-capacity boilers used in rural areas.

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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.

Keywords

Fixed-bed coal / Grate system / Air supply to coal layer / Mechanical loss

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A. B. Kudasheva, M. Zh. Khazimov, A. K. Niyazbayev, A. A. Tursynzhanova, A. B. Borsikbayeva, B. A. Urmashev, V. D. Gorburov, K. M. Khazimov. Efficient Combustion of the Fixed Coal Layer in an Advanced Combustion Chamber Design for Low-Power Boilers. Transactions of Tianjin University, 2024, 30(6): 471-487 DOI:10.1007/s12209-024-00415-z