Comparison of single particle combustion behaviours of raw and torrefied biomass with Turkish lignites

Magalhães, Duarte; Panahi, Aidin; Kazanç, Feyza; Levendis, Yiannis A.

doi:10.1016/j.fuel.2018.12.124

Cited by 48 publications

(16 citation statements)

References 53 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…According to Wen et al [10], there are two competing processes ruling the PM1-10 formation: mineral matter coalescence, and char fragmentation. The TL investigated has been observed in another work by the author [21] to undergo mild fragmentation under similar conditions; furthermore, in the same work [21] char combustion temperatures of ~1500 ºC were measured and albeit sufficient for the melting of Fe2O3 (melting temperature of 1565 ºC), are insufficient for the melting of SiO2 (melting temperature of 1710ºC). The results obtained suggest that PM10 formation for TL was determined by char fragmentation.…”

Section: Fuel Effect On Pm Formationmentioning

confidence: 74%

Particulate Matter Formation During Co-Combustion of Agricultural Residues With Turkish Lignite Using a Drop Tube Furnace

Özerinç

2019

Eskişehir Technical University Journal of Science and Technology a - Applied Sciences and Engineering

View full text Add to dashboard Cite

This study investigates the particulate matter formation during combustion of olive residue, almond shell, and Tunçbilek lignite. Selected fuels (olive residue and Tunçbilek lignite) were also co-fired to evaluate the influence on particulate matter emission. Olive residue was ground to different size ranges (< 125 µm and 212-300 µm) to investigate the influence of the particle size and blended in different ratios of biomass / coal to analyse the interactions between fuels. Tests were performed in a drop tube furnace at high temperature (1000 ºC), with a high heating rate (~10 4 ºC/s), and short residence time (~3 s). Fuel was fed into the furnace at a low mass rate of 10 g/h using a syringe pump. Particulate matter was collected using a 3-stage stack impactor and categorized according to the aerodynamic diameters, PM2.5, PM2.5-10, and PM10. The results obtained included particle burnout, and particulate matter concentration. Particle burnout was above 95% for all studied fuels. Particulate matter emission depended greatly on the fuel and the blend. Olive residue presented the lowest values of PM2.5 (176 mg/g ash in fuel fed) compared with both almond shell (214 mg/g ash in fuel fed) and Tunçbilek lignite (286 mg/g ash in fuel fed). PM10 emission was particularly low for olive residue (~200 mg/g ash in fuel fed), whereas almond shell and Tunçbilek lignite showed similar values (~400 mg/g ash in fuel fed). Larger biomass particles resulted in unchanged particulate matter emissions. Co-firing of the olive residue with the Tunçbilek lignite resulted in lower PM2.5 (as compared to neat olive); higher PM2.5-10 (as compared to neat lignite); and lower PM10 (as compared to lignite). Blends of OR-TL in 25-75 ratio showed lower values of both PM2.5 and PM10 as compared with the 50-50 blends of the same fuels.

show abstract

Section: Fuel Effect On Pm Formationmentioning

confidence: 74%

Particulate Matter Formation During Co-Combustion of Agricultural Residues With Turkish Lignite Using a Drop Tube Furnace

Özerinç

2019

Eskişehir Technical University Journal of Science and Technology a - Applied Sciences and Engineering

View full text Add to dashboard Cite

show abstract

“…There are a number of researches which investigate NO x emission formation and mechanism of NO x reduction. [16][17][18][19][20]22,23 NO x formation is dependent on fuel composition and combustion conditions such as flame temperature and oxygen concentration. Ninety-five percent of the total NO x emission is NO, while 5% represents the NO 2.…”

Section: Nox Emissionmentioning

confidence: 99%

“…Torrefied biomass is more preferable than raw biomass since it reduces emission gases without significant change in power plant efficiency. Several studies have been performed in order to investigate combustion and emission characteristics of torrefied biomasses . But there are limitations in these studies for estimation of combustion behavior in near real‐scale combustion environment because the combustion tests have been done in lab‐scale furnaces, with single particle or small fuel feed rates under ~g/h.…”

Section: Introductionmentioning

confidence: 99%

“…Several studies have been performed in order to investigate combustion and emission characteristics of torrefied biomasses . But there are limitations in these studies for estimation of combustion behavior in near real‐scale combustion environment because the combustion tests have been done in lab‐scale furnaces, with single particle or small fuel feed rates under ~g/h. Moreover, there are few studies reported for combustion of 100% torrefied biomass for higher fuel feed rates (> ~kg/h) in oxy‐combustion environment.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental study on combustion of torrefied palm kernel shell (PKS) in oxy‐fuel environment

et al. 2019

View full text Add to dashboard Cite

Summary Oxy‐combustion of biomass can be a major candidate to achieve negative emission of CO2 from a pulverized fuel (pf)‐firing power generation plants. Understanding combustion behavior of biomass fuels in oxy‐firing conditions is a key for design of oxy‐combustion retrofit of pulverized fuel power plant. This study aims to investigate a lab‐scale combustion behavior of torrefied palm kernel shell (PKS) in oxy‐combustion environments in comparison with the reference bituminous coal. A 20 kWth‐scale, down‐firing furnace was used to conduct the experiments using both air (conventional) and O2/CO2 (30 vol% for O2) as an oxidant. A bituminous coal (Sebuku coal) was also combusted in both air‐ and oxy‐firing condition with the same conditions of oxidizers and thermal heat inputs. Distributions of gas temperature, unburned carbon, and NOx concentration were measured through sampling of gases and particles along axial directions. Moreover, the concentrations of SOx and HCl were measured at the exit of the furnace. Experimental results showed that burnout rate was enhanced during oxy‐fuel combustion. The unburnt carbon in the flue gas was reduced considerably (~75%) during combustion of torrefied PKS in oxy‐fuel environment as compared with air‐firing condition. In addition, NO emission was reduced by 16.5% during combustion of PKS in oxy‐fuel environment as compared with air‐firing condition.

show abstract

“…All torrefied biomass fuels were air-dried, chopped in a household blender, and size classified by sieving to obtain size cuts of (212-300 µm) based on the findings of previous study in this laboratory [23,24]. In a different study [25], it was observed that the torrefaction process reduced the particle aspect ratios and enhanced the uniformity of particle sizes. The Proximate analysis and the Ultimate analysis of the biomass fuels on a dry basis, are given in Table 1.…”

Section: Preparation Of Samplesmentioning

confidence: 99%

Oxy-combustion Behavior of Torrefied Biomass Particles

Panahi¹,

Toole²,

Yang³

et al. 2019

Preprint

Self Cite

View full text Add to dashboard Cite

A fundamental investigation was conducted on the combustion characteristics of torrefied biomass in both air and O2/CO2 gases containing 21% or 30% oxygen mole fractions. These gases simulated oxy-combustion environments. The targeted torrefied biomass types were waste crops, both 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, a high-speed high-resolution camera. Entire luminous particle combustion profiles of single particles were recorded by means of highspeed high-resolution cinematography. Combustion of these particles took place in two phases. Initially, volatiles evolved and burned in spherical/ellipsoidal envelope flames; then, upon extinction of these flames, char residues ignited and burned. Replacing air as the furnace background gas with 21%O2-79%CO2 reduced the luminosity of flame and the lengthened the burnout times; and increasing the oxygen mole fraction further to 30% increased the luminosity of the flame and shortened the burnout times.

show abstract

Comparison of single particle combustion behaviours of raw and torrefied biomass with Turkish lignites

Cited by 48 publications

References 53 publications

Particulate Matter Formation During Co-Combustion of Agricultural Residues With Turkish Lignite Using a Drop Tube Furnace

Particulate Matter Formation During Co-Combustion of Agricultural Residues With Turkish Lignite Using a Drop Tube Furnace

Experimental study on combustion of torrefied palm kernel shell (PKS) in oxy‐fuel environment

Oxy-combustion Behavior of Torrefied Biomass Particles

Contact Info

Product

Resources

About