Co-gasification of woody biomass and coal with air and steam

Kumabe, Kazuhiro; Hanaoka, Toshiaki; Fujimoto, Shinji; Minowa, Tomoaki; Sakanishi, Kinya

doi:10.1016/j.fuel.2006.08.026

Cited by 253 publications

(132 citation statements)

References 14 publications

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“…The increase in CO 2 was more evident when coal was blended with EB. This behaviour in gas production was reflected in the H 2 /CO ratio, which decreased slightly for all the blends (see Table 5), in agreement with the results found by other authors [11,27]. In general, other process parameters such as carbon conversion and cold gas efficiency clearly improved when coal PT was gasified with biomass due to the high carbon conversion to gas.…”

Section: Effect Of Blending Fuelssupporting

confidence: 91%

“…Additionally, biomass and coal are considered as potential feedstocks for the supply of syngas (CO and H 2 ) used in the synthesis of liquid fuels by gasification. In recent years, the advantages of the cogasification of woody biomass and coal have been reported by several researchers, including the reduction in the production of tar when coal is cogasified with biomass, which can produce large amounts of tar when gasified alone [6,[9][10][11].…”

Section: Introductionmentioning

confidence: 99%

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High-pressure co-gasification of coal with biomass and petroleum coke

Fermoso

Arias

Plaza

et al. 2009

Fuel Processing Technology

181

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The effect of the main operation variables (temperature, pressure and gasifying agent composition) on gas production and other process parameters, such as carbon conversion, cold gas efficiency and high heating value, during the steam-oxygen gasification of a bituminous coal were studied. It was observed that temperature and oxygen concentration were the most influential variables during the gasification process. In addition, co-gasification tests of binary blends of a bituminous coal with different types of biomass (up to 10 %) and petroleum coke (up to 60 %), as well as ternary blends of coal-petcoke-biomass (45-45-10 %) were conducted in order to study the effect of blending on gas production and carbon conversion.

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Section: Effect Of Blending Fuelssupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

High-pressure co-gasification of coal with biomass and petroleum coke

Fermoso

Arias

Plaza

et al. 2009

Fuel Processing Technology

181

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“…This is contrary to results obtained by [30][31][32][33][34][35]; their experimental results show that increasing biomass ratio in the blend either increases concentration of carbon-containing compounds [CO 2 , CO, light hydrocarbon gases (C 1 and C 2 ) and tars] while H 2 either decreases or stays constant. A screening of the experimental data can clarify this apparent contradiction.…”

Section: Feedstockcontrasting

confidence: 79%

“…A screening of the experimental data can clarify this apparent contradiction. Kumabe et al [33] added biomass on a carbon basis, not on a total weight basis; however, the hydrogen content in the biomass used was high enough so increasing the biomass ratio in the fuel blend would have increased the ration of hydrogen in the gas, instead a reduced concentration of hydrogen in the gas was observed. Using the ultimate analysis of the fuels the relative atomic compositions were CH 1.548 O 0.737 N 0.002 for biomass (Japanese Cedar) and CH 0.597 O 0.159 N 0.013 (Mulia coal).…”

Section: Feedstockmentioning

confidence: 99%

A Review of Thermal Co-Conversion of Coal and Biomass/Waste

2014

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Abstract:Biomass is relatively cleaner than coal and is the only renewable carbon resource that can be directly converted into fuel. Biomass can significantly contribute to the world's energy needs if harnessed sustainably. However, there are also problems associated with the thermal conversion of biomass. This paper investigates and discusses issues associated with the thermal conversion of coal and biomass as a blend. Most notable topics reviewed are slagging and fouling caused by the relatively reactive alkali and alkaline earth compounds (K 2 O, Na 2 O and CaO) found in biomass ash. The alkali and alkaline earth metals (AAEM) present and dispersed in biomass fuels induce catalytic activity during co-conversion with coal. The catalytic activity is most noticeable when blended with high rank coals. The synergy during co-conversion is still controversial although it has been theorized that biomass acts like a hydrogen donor in liquefaction. Published literature also shows that coal and biomass exhibit different mechanisms, depending on the operating conditions, for the formation of nitrogen (N) and sulfur species. Utilization aspects of fly ash from blending coal and biomass are discussed. Recommendations are made on pretreatment options to increase the energy density of biomass fuels through pelletization, torrefaction and flash pyrolysis to reduce transportation costs.

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“…wheat straw (9), food waste (10), and wood-based biomass (11). Lignocellulosic biomass is mainly composed of cellulose and hemicellulose (60-80% dry basis), lignin (10-25%), some extractives, minerals, and small amounts of sulfur, nitrogen, and chlorine (12).…”

Section: Introductionmentioning

confidence: 99%

Thermochemical Conversion Behaviour of Different Biomass Feedstocks: Pyrolysis and Gasification

Isik-Gulsac¹,

Çetin²,

Engin³

et al. 2016

Journal of the Turkish Chemical Society, Section A: Chemistry

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Abstract:In this study, a bench-scale bubbling fluidized bed (BFB) gasifier and thermogravimetric analyzer (TGA) were applied for the determination of the thermochemical conversion reactivity of biomass fuels under both gasification and pyrolysis conditions. Six different biomass feedstocks, namely; straw pellet (SP), softwood pellet (WP), torrefied wood chips (TWC), pyrolysis char (PC), milled sunflower seed (MSS) and dried distillers' grains and solubles (DDGS) were investigated. TGA of biomass feedstocks were carried out under pyrolysis conditions at four different heating rates (2-15 °C/min). Raw data obtained from the experiments were used to calculate the kinetic parameters (A, Ea) of the samples by using two different models; Coats-Redfern and Isoconversional Method. TGA analysis showed that pyrolysis char was the only sample having decomposition temperature above 800 K since it was the prepyrolized sample before gasification. According to Derivative Thermogravimetric Analysis (DTG) profiles, two peaks and two shoulders at around 450-650 K were observed for DDGS whereas no peaks were detected for pyrolysis char as the indication of absence of volatiles/cellulosic components. It was seen that the highest devolatilization rates and devolatilization temperatures (associated mainly with cellulose decomposition) were obtained for softwood and torrefied wood samples, which had the least char yields among the other biomass feedstocks. It was seen that WP was more reactive for thermochemical conversion and less prone to agglomeration. Furthermore high ash content and agglomeration index of MSS were the potential drawbacks in front of its utilization via thermochemical conversion. During the air gasification of these feedstocks (except DDGS), the product syngas was characterized in terms of main gas composition, tar, and sulfur compounds. It was shown that the highest cold gas efficiency, carbon conversion and calorific value were obtained for the gasification of SP. On the other hand, SP had some drawbacks regarding its high agglomeration tendency and low deformation temperature. Among all feedstocks, gasification reactivity of MSS was found to be quite poor. MSS seemed to expose to pyrolization instead of gasification. WP and TWC were gasified with acceptable conversion values and efficiencies when compared with SP. It was understood that WP is the preferred choice for the thermochemical conversions.

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Co-gasification of woody biomass and coal with air and steam

Cited by 253 publications

References 14 publications

High-pressure co-gasification of coal with biomass and petroleum coke

High-pressure co-gasification of coal with biomass and petroleum coke

A Review of Thermal Co-Conversion of Coal and Biomass/Waste

Thermochemical Conversion Behaviour of Different Biomass Feedstocks: Pyrolysis and Gasification

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