Fluidized bed gasification of coal–oil and coal–water–oil slurries by oxygen–steam and oxygen–CO2 mixtures

Svoboda, Karel; Pohořelý, Michael; Jeremiáš, Michal; Kameníková, Petra; Hartman, Miloslav; Skoblja, S.; Šyc, Michal

doi:10.1016/j.fuproc.2011.11.001

Cited by 35 publications

(36 citation statements)

References 23 publications

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“…There is no general trend for the effects of different coal ranks on coal gasification with CO 2 but generally low-rank coals are more reactive than highrank coals. 50 The use of CO 2 as a gasifying agent offers several advantages 38 including (1) producing a more reactive char resulting in efficient gasification and reduction in residual char, (2) being a less corrosive gasification medium compared with steam, (3) offering more flexibility in syngas production suitable for various downstream applications, and (4) saving water or steam as the gasifying agent. 50 As expected, the rate of gasification depends on the pressure as well.…”

Section: Co 2 As a Gasifying Agent To Produce Syngasmentioning

confidence: 99%

Carbon cycle in advanced coal chemical engineering

Xie

2015

Chem. Soc. Rev.

157

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This review summarizes how the carbon cycle occurs and how to reduce CO2 emissions in highly efficient carbon utilization from the most abundant carbon source, coal. Nowadays, more and more attention has been paid to CO2 emissions and its myriad of sources. Much research has been undertaken on fossil energy and renewable energy and current existing problems, challenges and opportunities in controlling and reducing CO2 emission with technologies of CO2 capture, utilization, and storage. The coal chemical industry is a crucial area in the (CO2 value chain) Carbon Cycle. The realization of clean and effective conversion of coal resources, improving the utilization and efficiency of resources, whilst reducing CO2 emissions is a key area for further development and investigation by the coal chemical industry. Under a weak carbon mitigation policy, the value and price of products from coal conversion are suggested in the carbon cycle.

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Section: Co 2 As a Gasifying Agent To Produce Syngasmentioning

confidence: 99%

Carbon cycle in advanced coal chemical engineering

Xie

2015

Chem. Soc. Rev.

157

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“…Svoboda et al [42] reported the concentrations of BTX (benzene, toluene, xylene) and heavy tars fractions several times higher in the process of co-gasification of coal and rapeseed oil (50% by weight) with steam and oxygen mixture than the values observed in coal gasification. Pinto et al [11] studied the process of co-gasification of coal with 2.5-10% by weight of edible oils in a fluidized bed reactor and with air and air/steam mixtures as a gasification agent.…”

Section: Coal and Biomass Blendsmentioning

confidence: 98%

“…The results of the research studies on limiting tar formation in the process of gasification [27,42,48] showed that an increase in a temperature and long residence times facilitate thermal cracking reactions. These reactions are observed based on a decrease in the total gas yields and higher content of light components in tars [47,49].…”

Section: Thermal Crackingmentioning

confidence: 99%

The Influence of Feedstock Type and Operating Parameters on Tar Formation in the Process of Gasification and Co-Gasification

Kamińska-Pietrzak¹,

Howaniec²,

Smoliński³

2013

Ecological Chemistry and Engineering S

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Increasing energy demand, limited resources of fossil fuels and environmental aspects are the main rationales of the research efforts aiming at wider utilization of renewable resources and waste in energy generation systems. Gasification technologies are based on thermochemical processing of solid, liquid and gaseous fuels to gas of the composition dependent on kind of gasification agent and operating parameters used. The range of applications of the product gas includes basically chemical and petrochemical industries. Its utilization in power generation systems is also of industrial interest since the environmental impact of gasification technologies is lower and the process efficiency is higher than of coal-fired power plants and it enables to utilize wide range of fuels, including fossil fuels, biomass, industrial waste and various fuel blends. One of the most important operational issues related with thermochemical processing of biomass and waste is the formation of tars, which reduces the energy efficiency of the process and causes technical problems in a system operation. The amount and quality of tars depends on the chemical composition of a fuel, a gasification agent used and its ratio to fuel flow, process temperature and pressure as well as the construction of a gasifier. In the paper review of the research on the influence of operating parameters and kind of feedstock on tar formation and composition in the process of gasification and co-gasification is presented.

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“…3) to produce higher concentrations of CO 2 and H 2 in the syngas [ Steam as the gasifying agent can be fully or partially substituted by CO 2 . The use of CO 2 instead of steam is of practical interest for various reasons; for example, (i) the possible reuse of CO 2 from carbon capture technologies or from the recycling of flue gas from oxyfuel combustion (composed of a mixture of CO 2 and H 2 O) [5][6][7][8]; (ii) the use of CO 2 instead of N 2 as an inert gas (for example in fuel dosing trains), as CO 2 behaves as an inert at lower temperatures [6,9,10]; (iii) adjustment of the H 2 /CO ratio in the syngas for various synthesis technologies [9, [11][12][13]; or (iv) because thermal processing via CO 2 rather than steam avoids the use of large quantities of water, which has a large latent heat of vapourisation [14].…”

Section: Introductionmentioning

confidence: 99%

Gasification of biomass with CO2 and H2O mixtures in a catalytic fluidised bed

Jeremiáš

Pohořelý

Svoboda

et al. 2017

Fuel

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Highlights  Different mixtures of biomass gasifying agents were compared (H 2 O+O 2 , CO 2 +H 2 O+O 2 , CO 2 +O 2 and N 2 +O 2).  Mixtures of dolomitic limestone and silica sand (1:1 or 1:3 by vol.) were used as fluidised bed material.  The highest fuel carbon conversion was observed for mixtures of CO 2 and H 2 O as the gasifying agent.  Use of the combination of CO 2 and H 2 O leads to a higher degree of tar decomposition.

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Fluidized bed gasification of coal–oil and coal–water–oil slurries by oxygen–steam and oxygen–CO2 mixtures

Cited by 35 publications

References 23 publications

Carbon cycle in advanced coal chemical engineering

Carbon cycle in advanced coal chemical engineering

The Influence of Feedstock Type and Operating Parameters on Tar Formation in the Process of Gasification and Co-Gasification

Gasification of biomass with CO2 and H2O mixtures in a catalytic fluidised bed

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