Production of the glycerol-impregnated hybrid coal and its characterization

Bae, Jong‐Soo; Lee, Dong‐Wook; Lee, Young‐Joo; Park, Se-Joon; Hong, Ji‐Yeon; Kim, Joeng-Geun; Lee, Byoung-Hwa; Jeon, Chung-Hwan; Han, Choon; Choi, Young-Chan

doi:10.1016/j.fuel.2013.10.022

Cited by 20 publications

(14 citation statements)

References 31 publications

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“…Second, due to the low-temperature evaporation characteristics of bioliquids, spontaneous combustion may occur when coal impregnated with bioliquids are stored in an open-air storage yard, and the risk of explosion exists in the pre-dry process of coal power plants due to hot-air drying. Lastly, because bioliquids have higher reactivity than coal, a simple blending with coal will impede the ignition of coal [11]. Against this backdrop, this study investigated the combustion characteristics of coal impregnated with glycerol and palm oil residue as the representative bioliquids that evaporate at a temperature below 200 C, the results of which are provided in Fig.…”

Section: Applicationmentioning

confidence: 99%

“…In a previous study, glycerol-impregnated hybrid coal was developed by impregnating glycerol into coal pores and thereby reconstructing glycerol to have the characteristics of the artificial volatile matter of coal [11]. That study suggested a method of shifting evaporation temperature of glycerol, which usually evaporates at a temperature below 200 C, to the combustion zone of coal, thereby allowing for co-combustion of glycerol and coal in the existing coal-fired power plants.…”

Section: Introductionmentioning

confidence: 99%

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An investigation of the evaporation behavior of bioliquid in the pores and its application to hybrid coal combining biomass with coal

Bae

Lee

et al. 2015

Applied Thermal Engineering

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Section: Applicationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An investigation of the evaporation behavior of bioliquid in the pores and its application to hybrid coal combining biomass with coal

Bae

Lee

et al. 2015

Applied Thermal Engineering

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“…Usually, blends are consisted of 15 wt% of glycerol with costs associated to modifications of the existing installations to be small [55][56][57]. Bae et al [58] used glycerol as an additive to make a hybrid coal. Specifically, glycerol-impregnated hybrid coal was developed as a new fuel technology in which glycerol played an important role in an artificial volatile matter by substituting inherent moisture in the coal pores with glycerol.…”

Section: Glycerol Co-valorization With Lignite For Power Generation Smentioning

confidence: 99%

Co-valorization of Crude Glycerol Waste Streams with Conventional and/or Renewable Fuels for Power Generation and Industrial Symbiosis Perspectives

Manara

Zabaniotou

2015

Waste Biomass Valor

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Crude glycerol is the principal by-product of biodiesel industry, accounting for 10 wt% of biodiesel production. As the production of biodiesel grows, the environmental and sustainable valorization of crude glycerol becomes an imperative task which affects directly the biodiesel production cost. The present study focuses on covalorization of crude glycerol with conventional and/or renewable resources. The use of pyrolysis and gasification, as waste management practices, closing the loop in energy and agriculture, by using the extracted oil for biodiesel production and the remaining residual biomass for combined heat and power generation, has great potential in a circular economy. The paper is of scientific interest as it investigates the valorization of glycerol waste streams produced from small-scale biodiesel plants, targeting to an effective management solution of the above streams in countries such as Greece, where a chemical biorefinery is not viable due to small availability of glycerol supply. Results have shown that co-valorization of crude glycerol with waste biomass fulfilling the energetic needs of the biodiesel plant within the boundaries of the company, can contribute in decreasing the cost of biodiesel production, while providing a rather short-term solution to the existing environmental problem of waste glycerol.

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“…Accordingly, the same group suggested the use of glycerol, which is not a food but a byproduct of the biodiesel process, as an alternative additive to low-rank coal . Although glycerol is an attractive additive to upgrade low-rank coal to avoid food ethics objections, they reported that the drying process with glycerol still has disadvantages in terms of combustion behavior.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of the Glycerol-Embedded Hybrid Coal

Park

Lee

et al. 2019

ACS Sustainable Chem. Eng.

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The molasses embedded hybrid coal (Hybrid Coal by Korea Institute of Energy Research; HCK) was previously proposed as an attractive alternative to low-rank coals that tend to show low calorific values and high CO2 emissions. HCK was synthesized by mixing molasses with a low-rank coal to enhance its heating value. Nevertheless, food ethics regarding molasses additives still have impeded its commercial acceptance. In this study, we propose a glycerol (nonfood)-based coal upgrading process to improve the combustion kinetics and heating value of hybrid coal in comparison to the previous HCK. The process involves drying at 105 °C followed by torrefaction process at 250 °C. During torrefaction, the glycerol additive starts to evaporate at about 180 °C and then is almost vaporized out to the coal surface. To avoid glycerol loss, we employ sulfuric acid as a torrefaction catalyst to suppress glycerol evaporation. In comparison to the molasses yield of 65% after torrefaction in the previous HCK synthesis process, glycerol-embedded torrefaction with sulfuric acid showed a 55% yield in mass. The glycerol-embedded hybrid coal shows a homogeneous combustion peak regardless of the mixing ratios, leading to a 35% reduction of unburned carbon emissions, which is one of the particular matter sources of combustion flue gas. Furthermore, the proposed synthesis process increases the net caloric value to 80% and lowers the water uptake to 84%, even without a higher SO2 emission, in comparison with raw coal.

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Production of the glycerol-impregnated hybrid coal and its characterization

Cited by 20 publications

References 31 publications

An investigation of the evaporation behavior of bioliquid in the pores and its application to hybrid coal combining biomass with coal

An investigation of the evaporation behavior of bioliquid in the pores and its application to hybrid coal combining biomass with coal

Co-valorization of Crude Glycerol Waste Streams with Conventional and/or Renewable Fuels for Power Generation and Industrial Symbiosis Perspectives

Preparation and Characterization of the Glycerol-Embedded Hybrid Coal

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