Investigation into a catalytically controlled reaction gasifier (CCRG) for coal to hydrogen

The gas evolution, mass decay behavior and energy content of several woods, grasses, and agricultural residues were examined with steam and CO(2) gasification using thermogravimetric analysis and gas chromatography. CO(2) concentrations were varied between 0 and 100% with steam as a coreactant. Carbon conversion was complete with 25% CO(2)/75% steam compared to 90% conversion with pure steam in the temperature range of 800-1000 degrees C. The largest effect was from 0-5% CO(2) introduction where CO concentration increased by a factor of 10 and H(2) decreased by a factor of 3.3 at 900 degrees C. Increasing CO(2) from 5 to 50% resulted in continued CO increases and H(2) decrease by a factor of 3 at 900 degrees C. This yielded a H(2)/CO ratio that could be adjusted from 5.5 at a 0% CO(2) to 0.25 at a 50% CO(2) concentration. Selection of the gasification parameters, such as heating rate, also enabled greater control in the separation of cellulose from lignin via thermal treatment. 100% CO(2) concentration enabled near complete separation of cellulose from lignin at 380 degrees C using a 1 degrees C min(-1) heating rate. Similar trends were observed with coal and municipal solid waste (MSW) as feedstock. The likely mechanism is the ability for CO(2) to enhance the pore structure, particularly the micropores, of the residual carbon skeleton after drying and devolatilization providing access for CO(2) to efficiently gasify the solid.

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“…We have found that CO 2 is a more reactive medium from initial calculations that have been previously published (8).…”

Section: Introductionmentioning

confidence: 65%

CO₂ as a Carbon Neutral Fuel Source via Enhanced Biomass Gasification

Butterman

Castaldi

2009

Environ. Sci. Technol.

159

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“…The results were validated with experimental data and found a good agreement for gas compositions under different operating conditions. Castaldi et al (Castaldi & Dooher, 2007b) investigated catalytic gasification with recycled CO2 for the coal to H2 production process using Aspen plus simulation. The results showed that the maximum H2 production was achieved under steam carbon ratio of 1.5 with 25% recycled CO2.…”

Section: Modelling Of Co-gasification Of Biomass and Coalmentioning

confidence: 99%

“…Very few studies assessed the feasibility of CO2 gasification under recycled conditions using thermodynamic equilibrium modelling and known kinetics (Castaldi & Dooher, 2007a;Prabowo et al, 2015;Renganathan et al, 2012). Also, the effect of biomass concentration in the fuel blend under CO2 gasification conditions is yet to be investigated.…”

Section: Modelling Of Co-gasification Of Biomass and Coalmentioning

confidence: 99%

Co-Gasification of Biomass and Coal: Overview, Challenges and Recommendations

Shahabuddin¹,

Bhattacharya²

2021

Preprint

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Co-gasification of biomass and coal is a promising technique to improve gasification performance besides reducing emission from individual gasification of coal. In this review, the current status of co-gasification, including challenges and possible solutions are discussed. It is found that co-gasification improves carbon conversion, syngas quality and heating value while reducing the slagging temperature and pollutants emission. The higher reactivity of co-gasification is the results of synergistic effect due to dominant alkali and alkaline earth materials (AAEM) present in biomass ash. The co-gasification challenges include non-uniform particle size of biomass, inhomogeneous mixing of particles, the temperature difference between coal and biomass particles, and the higher moisture content in biomass and agglomeration. However, these challenges can be mitigated by torrefaction of biomass using waste energy and optimum blending ratio.

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“…However, coal combustion has caused many environmental problems. Gasification technology is the main conversion technique used to produce syngas, which is widely used in industry (Minchener 2005;Castaldi and Dooher 2007). The hydrogasification of coal has been a research hotspot because of the increasing demand for natural gas in China and because it has the potential to produce substituted natural gas from coal (Lee et al 2006;Ding et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Effect of Biomass Char Additives on the Hydrogasification Behavior of a Bituminous Coal

et al. 2016

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The hydrogasification behavior of a Chinese bituminous coal with three different biomass char additives, i.e., sargassum char (SG char), saw dust char (SD char), and wheat straw char (WS char), was studied in a pressurized fixed bed reactor. The effects of the biomass char amount (0 to 30%), pressure (0.1 to 4 MPa), and temperature (973 K to 1073 K) on hydrogasification reactivity of coal were investigated. The results showed that the SD char and WS char improved the hydrogasification reactivity of coal noticeably, but for the SG char, the improvement at 973 K was not obvious because of the high content of chlorine. For all samples, the hydrogasification reactivity increased with increasing temperature and pressure. Moreover, experiments involving coal with different ash of biomass chars were conducted to verify the catalytic effects of alkali and alkaline earth metal (AAEM) species in the biomass char.

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Investigation into a catalytically controlled reaction gasifier (CCRG) for coal to hydrogen

Cited by 37 publications

References 11 publications

CO₂ as a Carbon Neutral Fuel Source via Enhanced Biomass Gasification

CO₂ as a Carbon Neutral Fuel Source via Enhanced Biomass Gasification

Co-Gasification of Biomass and Coal: Overview, Challenges and Recommendations

Effect of Biomass Char Additives on the Hydrogasification Behavior of a Bituminous Coal

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Investigation into a catalytically controlled reaction gasifier (CCRG) for coal to hydrogen

Cited by 37 publications

References 11 publications

CO2 as a Carbon Neutral Fuel Source via Enhanced Biomass Gasification

CO2 as a Carbon Neutral Fuel Source via Enhanced Biomass Gasification

Co-Gasification of Biomass and Coal: Overview, Challenges and Recommendations

Effect of Biomass Char Additives on the Hydrogasification Behavior of a Bituminous Coal

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Product

Resources

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CO₂ as a Carbon Neutral Fuel Source via Enhanced Biomass Gasification

CO₂ as a Carbon Neutral Fuel Source via Enhanced Biomass Gasification