The influence of the initial moisture content of cedar needles on the time characteristics of the ignition of coal-water suspensions

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Abstract

The results of experimental studies of the influence of the initial moisture content of cedar needles on the time characteristics of ignition of coal-water suspensions based on D-grade thermal coal are presented. Biomass (fallen and freshly cut cedar needles) was used as an additive accelerating the ignition process. An analysis was carried out of the influence of the initial moisture content of the plant additive in the composition of water-soluble suspensions on the ignition delay times. It has been established that the initial moisture content of cedar needles does not have a significant effect on the time characteristics of the fuel ignition process (the difference does not exceed 4%), but the addition of needles leads to a significant reduction in the ignition delay times (the VUS ignites faster on average by 15%).

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About the authors

D. Yu. Malyshev

National Research Tomsk Polytechnic University

Author for correspondence.
Email: dmitry.mlv@gmail.com

School of Energy Engineering

Russian Federation, Tomsk, 634050

Zh. A. Kostoreva

National Research Tomsk Polytechnic University

Email: zhanna.kostoreva@yandex.ru

School of Energy Engineering

Russian Federation, Tomsk, 634050 

M. S. Tamashevich

National Research Tomsk Polytechnic University

Email: maksimtamashevich@mail.ru

School of Energy Engineering

Russian Federation, Tomsk, 634050 

A. S. Poznakharev

National Research Tomsk Polytechnic University

Email: asp71@tpu.ru

School of Energy Engineering

Russian Federation, Tomsk, 634050 

References

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2. Fig. 1. Schematic diagram of an experimental biomass dehumidification plant (1 – stainless steel working chamber, 2 – heating element, 3 – pan with cedar needles, 4 – drying cabinet control unit, 5 – electronic scales, 6 – personal computer).

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3. Fig. 2. Diagram of an experimental installation for determining the ignition delay times of coal–water suspensions (1 – metal holder, 2 – WUS drop, 3 – furnace control unit, 4 – high–temperature furnace, 5 – movable platform, 6 – high-speed chamber, 7 - guide rails of the movable platform, 8 - exhaust ventilation).

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4. Fig. 3. The main stages of ignition and combustion of a coal-water suspension (46% coal, 4% fresh cedar needles, 50% water) with a characteristic initial size of 3 mm in a high-temperature environment (Tg = 1273 K).Gorenje et al.

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5. Fig. 4. dependence of the ignition timing of coal – fired fuels on the temperature of the oxidizing medium at different humidity of the plant component (1 – natural, 2 – dry) and different mass concentrations (1 – 50% water, 50% coal grade D, a – 50% water, 48% coal grade D, 2% cedar needles, B – 50% water, 46% coal grade D, 4% cedar needles, B-50% water, 44% charcoal grade D, 6% cedar needles).

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6. Fig. 5. The dependence of the ignition delay time on the characteristic size of the VUT droplet (50% water, 46% coal, 6% cedar needles), at different needle grinding tones (Tg = 1073 K).

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7. Fig. 6. Dependence of changes in the weight of cedar needles (a – freshly cut, b – fallen) from the time spent in the drying cabinet t at a temperature of 373 K.

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8. Fig. 7. Dependence of the change in the dimensionless mass M of cedar needles (1 – freshly cut, 2 – fallen) from the dimensionless time spent in the drying cabinet t at a temperature of 373 K.

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9. Fig. 8. Dependence of the speed (a) and power (b) spent on drying cedar needles (1 – freshly cut, 2 – fallen) from the time spent in the drying cabinet t at a temperature of 373 K.

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