Development of a biomass torrefaction process integrated with oxy-fuel combustion

Tran, Khanh-Quang; Trinh, Trung Ngoc; Bach, Quang‐Vu

doi:10.1016/j.biortech.2015.08.106

Cited by 48 publications

(16 citation statements)

References 14 publications

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“…A potential solution is offered by torrefaction, which transforms the sludge particles into coal-like solid fuel particles. In previous research [27,28], torrefied biomass particles were obtained at surrounding gas temperatures between 473 and 623 K. Thethermal treatment chemically converts oxygen to CO and CO 2 and reduces the O/C rate while increasing the energy density and hydrophobicity [29].In addition, the chemical and physical decompositions in torrefactionalter the reactivity, improve the flame stability and shorten the ignition delay of the fuel particles [30].The grindability and flowability of the torrefied particles might be improved by deforming the hemicellulose,which exists as fibrous structures in theparticles. Theeffects of torrefactionhave been extensively researched, but the analyses have been limited to thermogravimetricanalyses, which determine only the reactivity of lignocellulosic biomass materials [31][32][33].…”

Section: Introductionmentioning

confidence: 98%

Flame structures and ignition characteristics of torrefied and raw sewage sludge particles at rapid heating rates

Mock

Lee

Choi

et al. 2017

Fuel

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Torrefactionis a promising method for improving the quality of pulverised solid fuel, as itincreases the flame stability,radiative heat transfer and energy density of the fuel.Raw sewage sludge contains less fixed carbon and more ash compounds than other biomasses; consequently, it has poorenergy quality witha long ignition delay and forms arelatively low, sooty flame. In this study,we directly investigate the combustion behavioursof particles with varying degrees of torrefaction by burning them at 1340 K.Thetorrefied particles were prepared at different temperatures(473 K or 573 K) for different residence times (10minor 30min).The experimental parameters examined were the size range of the particles (150-215μmand 255-300 μm)and the O 2 percentage(10-40%).The particles wereentrained from a 3 cold carrier gas into a hot gas stream, igniting a volatile flame that was extinguished a few millisecondslater. These temporal variations in the burning particles weredetected byin-situ high speed photography (7000 frames/s).Thetorrefactiondegree affected the flame structure and varied the ignition delay, due to the mismatched reactivity and soot formation at rapid heating rates. The mosttorrefied sludge particlesexhibited a relatively luminous volatile cloudand a large flame, while preserving the duration of volatile combustion. These observations confirm theimproved pulverised combustion of the torrefied sludge particles. We also obtained valuable flame parameters (radius, intensity and combustion time) of the differentlytorrefied sludge particles.

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Section: Introductionmentioning

confidence: 98%

Flame structures and ignition characteristics of torrefied and raw sewage sludge particles at rapid heating rates

Mock

Lee

Choi

et al. 2017

Fuel

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“…Product gas effluent from a production well comprises of methane and a small amount of other gas like CO 2 , CO, etc. depending upon the reservoir temperature, coal rank or oxygen content in the injection stream …”

Section: Energy Enhancement Techniques From Cbm Depleted Reservoirmentioning

confidence: 99%

Coal Bed Methane Enhancement Techniques: A Review

2019

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Paper investigates the potential impact of Coalbed methane (CBM) in near present and future. CBM is a natural gas that mainly consists of methane present in physically adsorbed state on the surface of porous coal seam under geothermal pressure. CBM is a cleaner fuel which can be used in the transportation industry, conventional power generation, and many other ways. 50–60% of CBM recovery can be obtained under primary operations and enhancement techniques can increase recovery as high as 80%. Recovery enhancement can be made through temperature increase, pressure release or by selective adsorption in which an injection gas displace methane from coal surface. Recovery through the use of CO2, N2, CO2 & N2 mixture is discussed in detail. Underground coal gasification can be used to recover energy from methane depleted, unminable coal reservoirs and has many advantages over surface mining. CBM consists of both thermogenic and biogenic origin. Depleted CBM reservoirs are observed to produce methane even after recovery is done. Native naturally occurring microbes decomposes coal into methane which explains biogenic origin, through a series of reaction. Kinetics of these decomposition reaction could be escalated significantly through the injection of nutrients and genetically enhanced methanogens. These processes has a great potential and could provide a fossil fuel which is almost renewable as large amount of methane can be generated from small amount of coal.

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“…That is, biomass fuels contain less carbon, more oxygen, higher hydrogen, and lower heating value . However, there are some challenges during utilization of raw biomass fuels due to its low grindability, low energy density, and its hydrophilic characteristics . Torrefied biomass fuels are more preferable to achieve the specified target by improving these challenges related to utilization of raw biomass fuels in exiting facility of coal power plant.…”

Section: Introductionmentioning

confidence: 99%

“…3 However, there are some challenges during utilization of raw biomass fuels due to its low grindability, low energy density, and its hydrophilic characteristics. 4,5 Torrefied biomass fuels are more preferable to achieve the specified target by improving these challenges related to utilization of raw biomass fuels in exiting facility of coal power plant. Torrefied biomass is characterized by higher heating value, lower moisture content, better grindablity, and hydrophobicity.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2019

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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.

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Development of a biomass torrefaction process integrated with oxy-fuel combustion

Cited by 48 publications

References 14 publications

Flame structures and ignition characteristics of torrefied and raw sewage sludge particles at rapid heating rates

Flame structures and ignition characteristics of torrefied and raw sewage sludge particles at rapid heating rates

Coal Bed Methane Enhancement Techniques: A Review

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

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