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

Wang, Qingyue; Apaer, P.; Kurokawa, Haruki; Sugiyama, K.

doi:10.2495/sdp-v9-n5-680-691

Cited by 5 publications

(2 citation statements)

References 17 publications

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“…The much water content in the pyrolysis liquid product may be due to the release of volatile organic products during the preparation of condensed liquid tar sample. It is considerable that temperature conditions of the pyrolysis and gasification of tar are very important to reduce tar products for the pyrolysis and gasification processes [14][15][16][17] as bioenergy.…”

Section: Holocellulose and Lignin Contents In Coconut Shell And Huskmentioning

confidence: 99%

Pyrolysis behaviors of waste coconut shell and husk biomasses

Wang¹,

Sarkar²

2018

Int. J. EQ

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Coconut shell and husk are two biomasses wastes abundant in most of the coastal countries. However, despite their enormous potential as energy sources, they are hardly studied and their thermal characteristics are still not well known. In this study, both biomasses are thermally degraded through thermogravimetry (TG-DTA) and their pyrolysis product yield such as char, tar and gases are analyzed. The TG-DTA results show that pyrolysis of biomass consists of three stages. Three stages can be outlined as: (1) dehydration process for temperatures below 122°C, (2) pyrolytic cracking from 122°C to 400°C, stage consist of two exothermic simultaneous processes where hemicelluloses, cellulose and lignin are decomposed and a high amount of volatile matter formation occurs and (3) the last endothermic decomposition of the lignin at temperatures above 400°C. From the pyrolytic results, it is showed that the char and gases yields were increased with the decrement tar. The gas-evolving profiles from pyrolyzing the coconut shell and husk components in a packed bed, monitored by a GC-TCD and a GC-FID, showed similar behavior. H 2 was released out at a higher temperature (>450°C) and it got the maximum rate at 700°C then it decreased. CO 2 was released out at 130°C-750°C and got the maximum releasing value at 300°C-400°C. The released CO showed almost similar pattern with that of CO 2. However, the release rate was lower than CO 2 and the maximum release rate of CO was found at 300°C-400°C. CH 4 was released out at the temperature between 200°C-850°C, and it got the maximum rate at 550°C. The releasing of hydrocarbon was generally very low.

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Section: Holocellulose and Lignin Contents In Coconut Shell And Huskmentioning

confidence: 99%

Pyrolysis behaviors of waste coconut shell and husk biomasses

Wang¹,

Sarkar²

2018

Int. J. EQ

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“…The adsorbed atomic O reacts with the close of atomic carbon (C), and then the gasification will be progressed [10]. The mechanism of catalytic metal CO 2 gasification of char is given from the following reaction equation (2) to equation (4) [11].…”

Section: Product Gases Yields Obtained By Gasification Of Char Samplesmentioning

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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