Research of the processes of ignition and combustion of mixed fuels based on coal and wood under different conditions of thermal influence

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Resumo

The ignition processes of mixed fuels formed on the basis of grade 3B coal from the Maikuben deposit and finely dispersed sawmill and woodworking waste have been studied. An analysis of the processes of ignition and combustion of fuel mixtures with different organization of combustion processes was performed. It has been established that the concentration of the wood component has a significant impact on the processes of the onset of oxidation and combustion of mixed fuels. When the proportion of wood component in the mixture increases to 50%, the ignition delay time decreases by an average of 18% in all cases of the studies performed.

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Sobre autores

A. Misyukova

National Research Tomsk Polytechnic University; Gorbachev Kuzbass State University

Autor responsável pela correspondência
Email: adm14@tpu.ru
Rússia, Tomsk, 634059; Kemerovo, 650000

S. Yankovsky

National Research Tomsk Polytechnic University; Gorbachev Kuzbass State University

Email: jankovsky@tpu.ru
Rússia, Tomsk, 634059; Kemerovo, 650000

A. Berikbolov

National Research Tomsk Polytechnic University

Email: akb10@tpu.ru
Rússia, Tomsk, 634059

N. Yankovskaya

National Research Tomsk Polytechnic University

Email: nsy4@tpu.ru
Rússia, Tomsk, 634059

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2. Fig. 1. Experimental setup for studying ignition and combustion of mixed fuels during thermal heating in a layer: 1 – temperature-controlled muffle furnace; 2 – mixed fuel weighing 1 g; 3 – coordinate device with drive; 4 – platinum-rhodium thermocouple; 5 – high-speed video camera; 6 – Termodat signal converter; 7 – personal computer; 8, 9, 10, 11, 12 – communication channels between equipment [21].

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3. Fig. 2. Schematic diagram of the experimental setup for studying the ignition processes of a biomass particle and a coal particle located at a certain distance from each other (1; 2 and 3 mm): 1 – furnace with adjustable temperature, 2 – high-speed chamber, 3 – holder with needles for attaching a biomass particle and a coal particle, 4 – coordinate mechanism, 5 – communication channel of the coordinate mechanism with a laptop, 6 – communication channel of the camera with a laptop, 7 – laptop.

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4. Fig. 3. Schematic diagram of the experimental setup for studying the ignition of pulverized fuels in an air flow: 1 – temperature-controlled muffle furnace; 2 – pulverized particles of coal and wood; 3 – holder; 5 – high-speed video camera; 9 – personal computer; 4, 6, 8 – communication channels between the elements of the setup.

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5. Fig. 4. Change in ignition delay times during layer combustion of mixed fuels based on coal from the Maikuben deposit and finely dispersed wood: 1 – U_100%, D_0%; 2 – U_90%, D_10%; 3 – U_75%, D_25%; 4 – U_50%, D_50%.

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6. Fig. 5. The ignition process of pulverized mixed fuels located in a layer: (a) – 100%_U/0%_D; (b) – 90%_U/10%_D; (c) – 75%_U/25%_D; (d) – 50%_U/50%(D).

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7. Fig. 6. The influence of the wood component on the process of ignition of a coal particle with a change in the distance from one another by 1, 2 and 3 mm: 1 – coal, 2 – wood.

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8. Fig. 7. Change in ignition delay times during continuous combustion of mixed fuels based on coal from the Maikuben deposit and finely dispersed wood (1 – U_100%, D_0%; 2 – U_90%, D_10%; 3 – U_75%, D_25%; 4 – U_50%, D_50%).

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9. Fig. 8. The ignition process of floating dust-like mixed fuels in the temperature range of 600°C, 700°C and 800°C (a – 100%_U/0%_D; b – 90%_U/10%_D; 75%_U/25%_D; c – 50%_U/50%_D (1 – particles entering the frame; 2 – start of the ignition process; 3 – ignition of mixtures).

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