Study on heterogeneous reaction between tar and ash from waste biomass pyrolysis and gasification

Wang, Qingyue; Endo, Tadashi; Apar, P.; Gui, Li; Chen, Q.; Mitsumura, N.; Qian, Qingrong; Niida, H.; Animesh, S.; Sekiguchi, K.

doi:10.2495/esus130251

Cited by 4 publications

(4 citation statements)

References 10 publications

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“…It is worth to develop different technologies for controlling air pollutants emitted from fuel utilization. Some achievements in this study have been applied and linked with other studies reported during the 4th International Conference on Energy and Sustainability [17][18][19].…”

Section: Co 2 Gasifi Cation Reactivity Of Waste Wood Char Samplesmentioning

confidence: 69%

Reactivity for pyrolysis and co2 gasification of alkali metal loaded waste wood char

Wang¹,

Apaer²,

Kurokawa³

et al. 2014

Int. J. SDP

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In this study, different carbonization processes were performed for thinning wood waste as organic industrial waste and forestry waste biomass to produce waste wood char, which is used as solid and gaseous fuel. Waste biomass samples were added to Na + (NaOH) using thermogravimetry with a differential thermal analyser (TG/DTA), where the behaviour of thermal decomposition and the effect of additive amount of alkali metal were investigated. Waste wood char yields were increased at the peak temperature and weight loss was decreased with the increment of Na + (NaOH) loaded value. The fi xed carbon amount of waste wood char was also increased with the maximum Na + (NaOH) loaded value at 100:1, and then it was decreased. Furthermore, in order to evaluate the effect of Na + (NaOH) loaded value on char reactivity, an isothermal CO 2 gasifi cation experiment was performed at temperatures between 700°C and 900°C for chars obtained by pyrolysis at 900°C. It was shown that the reaction rate was increased with increasing temperature and the reaction rate of raw char was markedly slower than Na + (NaOH) loaded char. The activation energies of char were in decreasing trend with increasing Na loaded value. However, the activation energies of CO 2 gasifi cation of char samples were conversely increased when Na + loaded on char sample was more than 50:1. If too large amounts of Na + (NaOH) were loaded on char sample, the rate of gasifi cation reaction and the activation energy will be decreased as Na + reacts with the char surface covering the gasifying agent.

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Section: Co 2 Gasifi Cation Reactivity Of Waste Wood Char Samplesmentioning

confidence: 69%

Reactivity for pyrolysis and co2 gasification of alkali metal loaded waste wood char

Wang¹,

Apaer²,

Kurokawa³

et al. 2014

Int. J. SDP

Self Cite

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“…The condensable products of tar were cooled down and collected in a test tube to measure the yields, and the yields of gas were measured by a gas chromatograph with a fl ame ionization detector (GC-FID) and a gas chromatograph with a thermal conductivity detector (GC-TCD). More detailed results in this study newly added the debate on the contents of the conference paper published in 4th International Conference on Energy and Sustainability [6].…”

Section: Introductionmentioning

confidence: 83%

Study on biomass tar reduction by ash and fluidizing medium in a heterogeneous reaction

Wang¹,

Endo²,

Aparu³

et al. 2014

Int. J. SDP

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Since fossil energy resources are exhaustible in the world, renewable biomass is considered as one of the useful future resources for energy and materials. In addition, when the biomass grows, it can contribute to the prevention of global warming by circularly absorbing CO 2. There are different biomass utilization technologies such as the pyrolysis and gasifi cation, fermentation and combustion. For example, gaseous components are used as chemical products and used for energy production; these can be produced by the pyrolysis or synthesized by gasifi cation. However, there is the problem that condensable organic compounds, so-called 'tar' will also be generated during the pyrolysis and gasifi cation processes. Most of the tar components are present as gases at higher temperature inside of the reactors. However, a black oily liquid will be formed, leading to the equipment failure when the temperature is cooled down lower than their boiling points. Therefore, appropriate processing is required. As a processing method, catalytic decomposition of tar has been widely studied. In the present study, it was carried out for the thermal decomposition of cellulose in the experimental apparatus connecting two reaction tubes. Tar and gases generated by the thermal decomposition of cellulose in the fi rst reactor can be pyrolyzed with catalytic cracking in the second reactor. Tar contents were fi rstly cooled and collected. At the same time, the amount of gases was measured by a gas chromatograph with a fl ame ionization detector and a gas chromatograph with a thermal conductivity detector. Then, K and Ca were selected as the catalyst of alkali metals and alkaline earth metals contained in the waste biomass, which were present in the state of oxide or carbonate during the pyrolysis and gasifi cation. The amount of condensable products was decreased by installing catalytic contents of K 2 CO 3 and Ca(OH) 2. Additionally, the amount of gaseous products was increased. It can be concluded that an alkali metal compound (K 2 CO 3) and an alkaline earth compound (CaO) have a catalytic effect to decompose tar contents, which can enhance gaseous production in the secondary reaction.

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“…In our experiment, AAEM metal catalysts such as potassium were especially selected since the high catalytic ability of AAEM species in biomass [3][4][5], and iron catalyst was also used because they are inexpensive and readily available. These metal catalysts used in this study, were introduced using an impregnation method to be highly dispersed in the cellulose.…”

Section: Introductionmentioning

confidence: 99%

Study on catalytic pyrolysis and efficient gasification of cellulose as biomass samples

Wang¹,

Watanabe²,

Ogawa³

et al. 2015

WIT Transactions on Ecology and the Environment

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Fossil fuels such as petroleum and coal will be exhaustible energy resources in the near future. From the point of view of the depletion of fossil resources, the development of renewable resources is required for a future sustainable society. Therefore, in recent years, renewable biomass, which is ubiquitous throughout the world, has attracted attention. Many studies on the application of waste woody biomass have been focused on non-edible biomass. Pyrolysis and gasification technologies have been known as the effective energy conversion technologies of biomass because of the various gases production such as synthesis fuel gases and chemical basic compounds. In the pyrolysis process, gases, condensable hydrocarbons so-called "tar" and solid carbon contents namely "char" will be produced. During the subsequent gasification process, char will usually react with the gasifying agents at a high temperature of above 900°C to produce the synthesis gases. However, there are many problems caused from generated tar during the pyrolysis process such as clogging of the piping and corrosion in the reactor. In order to perform efficient pyrolysis and gasification, there is still less information about the catalytic method although it has been widely used. In this study, we investigated the influence of iron and potassium as the catalysts on the pyrolysis process and the gasification process using an impregnation method to introduce these catalysts into the cellulose samples which is the major component of woody biomass. From the pyrolytic results, it was shown that the production of char and yields of gases were increased with the tar decrease in the presence of the catalytic metal species. Potassium catalyst seemed to especially increase the char yields. It may be caused by the decrease of crystal characteristics of the cellulose in the presence of catalytic metal species. According to the results of the gasification, a lower Energy and Sustainability VI 27

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Study on heterogeneous reaction between tar and ash from waste biomass pyrolysis and gasification

Cited by 4 publications

References 10 publications

Reactivity for pyrolysis and co2 gasification of alkali metal loaded waste wood char

Reactivity for pyrolysis and co2 gasification of alkali metal loaded waste wood char

Study on biomass tar reduction by ash and fluidizing medium in a heterogeneous reaction

Study on catalytic pyrolysis and efficient gasification of cellulose as biomass samples

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