Proposal of a Pilot Plant (2T/day) for Solid Fuel Conversion of Cambodian Mango Waste Using Hybrid Hydrothermal Carbonization Technology

A new system using combined coal gasification and combustion has been developed for clean and high efficient utilization of coal. Following are the processes. The coal is first partially gasified and the produced fuel gas is then used for industrial purpose or as a fuel for a gas turbine. The char residue from the gasifier is burned in a circulating fluidized bed combustor to generate steam for power generation. For having the experimental investigation, a 1MW pilot plant test facility has been erected. Experiments on coal partial gasification with air, and recycle gas have been made on the 1 MW pilot plant test facility. The results show that, with air as gasification agent, the system can produce 4–5MJ/Nm3 low heating value dry gas and fuel conversion efficiency attains 50–70% in the gasifier, and residue 20–40% converted in the combustor and total conversion efficiency in the system is over 90%. In the gasifier, the carbon conversion efficiency increases with the bed temperature and the air blown temperature. CaCO3 has an effective effect for sulfur removal in the gasifier. The sulfur removal efficiency attains 85% with Ca/S molar ratio 2.5. The system can produce 12–14MJ/Nm3 middle heating value day gas by using high temperature circulation solid as heat carrier and recycle gas or steam as gasification media, but the fuel conversion efficiency only attain 30–40% in the gasifier and most of fuel energy is converted in the combustor. CaCO3 has an obvious effect on tar cracking and H2S removal. The sulfur removal efficiency attains 80% with Ca/S molar ratio 2.5.

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Thermodynamic modeling of solid fuel gasification in mixtures of oxygen and carbon dioxide

Journal of Physics Conference Series ◽

10.1088/1742-6596/2119/1/012101 ◽

2021 ◽

Vol 2119 (1) ◽

pp. 012101

Author(s):

I G Donskoy

Keyword(s):

Carbon Dioxide ◽

Thermodynamic Modeling ◽

Solid Fuel ◽

Carbon Capture ◽

Power Plants ◽

Thermal Power ◽

Carbon Capture And Storage ◽

Low Oxygen ◽

Fuel Conversion ◽

Oxygen Concentrations

Abstract One of the main problems in the use of solid fuels is inevitable formation of significant amounts of carbon dioxide. The prospects for reducing CO2 emissions (carbon capture and storage, CCS) are opening up with the use of new coal technologies, such as thermal power plants with integrated gasification (IGCC) and transition to oxygen-enriched combustion (oxyfuel). In order to study the efficiency of solid fuel conversion processes using carbon dioxide, thermodynamic modeling was carried out. Results show that difference between efficiency of fuel conversion in O2/N2 and O2/CO2 mixtures increases with an increase in the volatile content and a decrease in the carbon content. The effect of using CO2 as a gasification agent depends on the oxygen concentration: at low oxygen concentrations, the process temperature turns out to be low due to dilution; at high oxygen concentrations, the CO2 concentration is not high enough for efficient carbon conversion.

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Hydrothermal carbonization of waste from leather processing and feasibility of produced hydrochar as an alternative solid fuel

Journal of Environmental Management ◽

10.1016/j.jenvman.2019.06.067 ◽

2019 ◽

Vol 247 ◽

pp. 115-120 ◽

Cited By ~ 4

Author(s):

Jongkeun Lee ◽

Jeongseop Hong ◽

Deokjin Jang ◽

Ki Young Park

Keyword(s):

Solid Fuel ◽

Hydrothermal Carbonization ◽

Leather Processing

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Experimental Study on Hydrothermal Carbonization of Lignocellulosic Biomass with Magnesium Chloride for Solid Fuel Production

Processes ◽

10.3390/pr8040444 ◽

2020 ◽

Vol 8 (4) ◽

pp. 444 ◽

Cited By ~ 3

Author(s):

Samuel Carrasco ◽

Javier Silva ◽

Ernesto Pino-Cortés ◽

Jaime Gómez ◽

Fidel Vallejo ◽

...

Keyword(s):

Lignocellulosic Biomass ◽

Solid Fuel ◽

Magnesium Chloride ◽

Calorific Value ◽

Hydrothermal Carbonization ◽

Volatile Matter ◽

Matter Content ◽

Operating Conditions ◽

Energy Yield ◽

Mass Yield

The effect of magnesium chloride as an additive of hydrothermal carbonization (HTC) of lignocellulosic biomass (Pinus radiata sawdust) was studied. The HTC tests were carried out at fixed conditions of temperature and residence time of 220 °C and 1 h, respectively, and varying the dose of magnesium chloride in the range 0.0–1.0 g MgCl2/g biomass. The carbonized product (hydrochar) was tested in order to determine its calorific value (HHV) while using PARR 6100 calorimeter, mass yield by gravimetry, elemental analysis using a LECO TruSpec elemental analyzer, volatile matter content, and ash content were obtained by standardized procedures using suitable ovens for it. The results show that using a dose of 0.75 g MgCl2/g biomass results in an impact on the mass yield that was almost equal to change operating conditions from 220 to 270 °C and from 0.5 to 1 h, without additive. Likewise, the calorific value increases by 33% for this additive dose, resulting in an energy yield of 68%, thus generating a solid fuel of prominent characteristics.

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