Combustion Behavior of Relatively Large Pulverized Biomass Particles at Rapid Heating Rates

Mock, Chinsung; Lee, Hookyung; Choi, Sangmin; Manović, Vasilije

doi:10.1021/acs.energyfuels.6b01457

Cited by 41 publications

(23 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The temperature difference in the adiabatic flame between the 10% and 40% oxygen concentration samples was approximately 140 K. The post-combustion gas was at 1340 K, after~1 m/s, and contained under 21% oxygen, and the gas temperature profile was reported experimentally from previous work by Mock. 33 The high temperature and rapid heating rate (10 4 -10 5 K/s) allow the suspended single particle to ignite within a few s after injection.…”

Section: Environmental Conditionsmentioning

confidence: 99%

Combustion Behavior of Single Pellets of Coal–Wood Mixtures in a Hot Gas Flow Field

et al. 2018

Self Cite

View full text Add to dashboard Cite

This experimental study explores the burning characteristics of single pellets made of wood and coal mixtures for co-firing. Three types of pellets were prepared with different wood to coal ratios (100:0, 80:20% and 50:50%). Experiments were carried out in a laboratory reactor at rapid heating rates and under oxygen concentrations between 10% and 40%. To investigate their combustion behaviour, a single pellet was suspended on a wire injected into a hot gas stream at 1340 K, and flame and char combustion were recorded through an observation window by means of a high-resolution (4K) camera. The sequential combustion time, volatile flame characteristics and mass reduction rate were obtained over a time profile by carefully controlled particle injection. The results demonstrated that the char combustion time increased significantly compared with the volatile combustion time, which only varied a little, when the pellets contained coal in the mixture. Partially detached flames were also predominantly observed on pure biomass pellets at oxygen concentrations between 21% and 40%. During the homogeneous combustion period, the cross-sectional area of a pellet shrunk by 26.3%-37.5%, depending on the type of pellet.

show abstract

Section: Environmental Conditionsmentioning

confidence: 99%

Combustion Behavior of Single Pellets of Coal–Wood Mixtures in a Hot Gas Flow Field

et al. 2018

Self Cite

View full text Add to dashboard Cite

show abstract

“…Hence finding the right biomass particle size to co-fire with coal is important to achieve good combustion efficiency. This has been addressed theoretically by Sastamoinen et al [29] and experimentally by Mock et al [33]. The latter authors burned pulverized torrefied wood, sewage sludge and coffee waste and found that particles in the range of (355-424) µm when exposed to a hot vertical gas stream (1340 K) move to the direction of the stream and burn completely.…”

Section: Introductionmentioning

confidence: 95%

“…Larger particles fall to the bottom of the furnace and do not burn completely. Given the importance of biomass particle shape [28] and size in power generation boilers, this research further examined the burnout times of different pulverized torrefied biomasses in a gas temperature comparable to those implemented in Refs [28,29,33,34]. In this work, actual direct measurements of the entire particle burn-out times were made for three different types of torrefied biomass and these times were compared with burn-out times of coals of different ranks [34].…”

Section: Introductionmentioning

confidence: 99%

Torrefied Biomass Size for Combustion in Existing Boilers

Panahi¹,

Tarakçıoğlu²,

Levendis³

2019

Preprint

View full text Add to dashboard Cite

A fundamental investigation was conducted on the combustion characteristics in air of different torrefied biomass particles size ranges. The targeted biomass types were waste crop, herbaceous and woody. The experimental setup that was used in this investigation consisted of a drop-tube furnace, operated at a wall temperature of 1400 K, and a three-color pyrometer, interfaced with the furnace. Entire luminous particle combustion profiles of individual particles were recorded. Results are compared with relevant past data on the combustion characteristics of single coal particles of different ranks, burned in the same furnace under identical operating conditions. The goal of this work is to identify the appropriate size of torrefied biomass particles whose combustion durations match those of 75-90 μm pulverized coal particles, which is a size typically used in pulverized fuel boilers. Such data will be useful in deciding the fuel sizing for co-firing coal with biomass.

show abstract

“…Hence finding the right biomass particle size to co-fire with coal is important to achieve good combustion efficiency. This has been addressed theoretically by Sastamoinen et al [99] and experimentally by Mock et al [102]. The latter authors burned pulverized torrefied wood, raw sewage sludge and raw coffee waste and found that particles as large as those in the range of (355-425) µm when exposed to a hot upwards moving gas stream (1340 K) moved in the direction of the stream and burned completely.…”

Section: Introductionmentioning

confidence: 95%

“…Different types of pulverized torrefied biomass fuels in size cuts of (75-90) µm, (180-212) µm, (212-300) µm, (300-350) µm and (350-500) µm were burned at a gas temperature comparable to that used in the coal combustion studies of Refs [98,99,102,108]. Based on all these combined observations, the appropriate size of torrefied biomass particles that can be ignited and burned in time-frames that are comparable to those of a typical coal particle size (75-90 µm) used in utility boilers was determined.…”

Section: Introductionmentioning

confidence: 99%

Observations on the combustion of torrefied biomass

Tarakcioglu¹

View full text Add to dashboard Cite

This thesis examines observations on the combustion of different types of torrefied biomass. The targeted biomass types were waste crop, herbaceous, and woody; they included Corn straw, DDGS, Rice husk, Miscanthus, Bagasse, and Beechwood. Combustion of renewable biomass is of technological interest because it is considered to be nearly carbon-neutral. Furthermore, torrefaction of biomass improves the raw biomass properties and makes more "coal-like".Torrefied biomass has lower volatile matter content, higher fixed carbon content and higher energy content than raw biomass. It is also having low moisture content and it is less biodegradable. In this work, all biomass samples were torrefied at T= 275 °C for half an hour in nitrogen. Thereafter, torrefied biomass was size classified by sieving to obtain size cuts of (75-90) µm, (180-212) µm, (180-212) µm, (212-300) µm, (300-350) µm, (350-500) µm. The experimental setup that was used in this investigation consisted of an electrically-heated drop-tube furnace, operated at wall temperature 1400 K. A three-color pyrometer was interfaced with the furnace and a high-speed high-resolution camera, to record the entire luminous particle combustion profiles of individual particles.As identification of the maximum biomass particle size for combustion in an existing boiler is important, this work observed the time-temperature profiles of the aforementioned particle size and contrasted them to those of typically-used coal particles. It was forward that torrefied biomass particles in the size range of 212−300 μm burned in similar times as those of 75-90 μm coal.

show abstract

Combustion Behavior of Relatively Large Pulverized Biomass Particles at Rapid Heating Rates

Cited by 41 publications

References 48 publications

Combustion Behavior of Single Pellets of Coal–Wood Mixtures in a Hot Gas Flow Field

Combustion Behavior of Single Pellets of Coal–Wood Mixtures in a Hot Gas Flow Field

Torrefied Biomass Size for Combustion in Existing Boilers

Observations on the combustion of torrefied biomass

Contact Info

Product

Resources

About