Thermoplasticity and strength improvement of coking coal by addition of coal extracts

Chang, Chih Min; Whang, Thou Jen; Huang, Ded Shih; Wang, Der Her; Tsai, Sing Tsu; Hung, Ming Tsai

doi:10.1016/j.fuel.2013.09.004

Cited by 30 publications

(16 citation statements)

References 19 publications

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“…Removal of low molecular mass compounds from the organic mass of coals worsens its caking abilities [4][5][6]. Addition of extracted material to coals can increase their thermoplasticity and strength [7]. It suggests that the low molecular mass compounds participate actively in the processes of coal plasticization.…”

Section: Introductionmentioning

confidence: 99%

The influence of addition of coal tar pitch (CTP) and expired pharmaceuticals (EP) on properties and composition of pyrolysis products for lower and higher rank coals

Zubkova

Czaplicka

Puchala

2016

Fuel

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Section: Introductionmentioning

confidence: 99%

The influence of addition of coal tar pitch (CTP) and expired pharmaceuticals (EP) on properties and composition of pyrolysis products for lower and higher rank coals

Zubkova

Czaplicka

Puchala

2016

Fuel

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“…These SCCs can be used fruitfully for production of fuels, chemicals, anodic cokes, co-combustion with biomass, plastics etc. (Song and Schobert 2002;Nag et al 2018;Chang et al 2014;Sharma and Dhawan 2018). These can also be blended with the original coals and used for cocombustion.…”

Section: Uses Of Scc and Rcmentioning

confidence: 99%

Fractionation of coal through organo-separative refining for enhancing its potential for the CO2-gasification

Dhawan

Kumar

Upadhyayula

et al. 2020

Int J Coal Sci Technol

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Coal gasification has already been extensively studied earlier under varying conditions of steam, CO2, O2, inert conditions. Belbaid coal and its e, N and NMP-DETA SCC products recovered through organo-refining under milder ambient pressure conditions were subjected to CO2-gasification in a fixed bed reactor under varying conditions. CO2 being an inert gas becomes the most challenging to be utilized during the gasification process. The SCCs showed better CO2-gasification reactivity than the raw Belbaid coal at 900 °C. The use of the catalyst K2CO3 tremendously increased the gasification reactivity for both raw coal and the SCCs. The use of sugarcane bagasse for CO2-gasification along with raw coal as well as with residual coal was also studied. Gasification under CO2 atmosphere conditions was used to structurally understand the coals as the coal structure gets loosened after extraction.

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“…205 Use of the clean coal directly into the carbon fuel cell has been reported and found that its operation is largely temperature dependent and the use of ashless carbon is fruitful in increasing the life of the fuel cell in the long run and such fuel cells can have greater efficiency. 206 It would be interesting to note that carbon fuel cells have been reported to around 80% efficiency 207,208 The use of super clean coal can be made directly in gas turbines as a fuel for obtaining almost 50% efficiency of power generation. The general efficiency of coal based power generation varies from 33 to 38%.…”

Section: Potential Scope Of Utilization Of Supermentioning

confidence: 99%

Separative Refining of Coals through Solvolytic Extraction under Milder Conditions: A Review

Sharma

Dhawan

2018

Ind. Eng. Chem. Res.

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Not only cleaning but refining of coal has become an area of utmost importance both industrially and academically because of stringent environmental norms being imposed globally for arresting the climate change. However, coal is a polluting fuel, therefore, there is a grave need of deep refining of coal to obtain ashless coal for increasing its efficiency of utilization in order to minimize its impact on environment. The presence of ash in coal also greatly reduces the coal utility because of its deleterious effect on the boiler parts and gasification equipment. Solvent extraction (organo-refining) techniques produce Super Clean Coal (SCC) or Ultra Clean Coal (UCC) with almost zero ash content. The utilization of the SCC in the Integrated Gasification Combined Cycle (IGCC) Power Generation would increase the availability of this otherwise efficient and cleaner coal technology. Research work on different processes of solvent extraction of coal under varying conditions of temperature, pressure, and the nature of the solvent used and other parameters, their effect on the extraction yield have been discussed presently. Extraction of coal under milder ambient pressure conditions is desirable as this affords the recovery of coal without its fractionation, structural dislocations, or changes. The effect of the use of single solvent, mixture of two solvents (of solvent and cosolvent), i.e., synergism in enhancing the extraction yield under milder atmospheric pressure conditions have been reviewed. Utilization of high boiling solvents and coal derived solvents along with successive sequential solvent extractions for obtaining the enhanced extraction yields mainly under ambient pressure conditions have been discussed in the present paper. Hypercoal production under high pressure conditions, its characteristics, and utilization have also been described. Use of ionic liquids as potential solvents for coal extraction (especially of lignites) has also been discussed. Physical and chemical pretreatments greatly enhance the coal solvent extraction yield. Different potential uses of SCC such as in production of carbon nanotubes as a super clean fuel dust for car engines, synthesis of chemicals, etc. have been discussed. Separate discussion on nanotechnology of coals as related to solvent extraction of coal has also been included presently.

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Thermoplasticity and strength improvement of coking coal by addition of coal extracts

Cited by 30 publications

References 19 publications

The influence of addition of coal tar pitch (CTP) and expired pharmaceuticals (EP) on properties and composition of pyrolysis products for lower and higher rank coals

The influence of addition of coal tar pitch (CTP) and expired pharmaceuticals (EP) on properties and composition of pyrolysis products for lower and higher rank coals

Fractionation of coal through organo-separative refining for enhancing its potential for the CO2-gasification

Separative Refining of Coals through Solvolytic Extraction under Milder Conditions: A Review

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