Jihong Moon

Korea Institute of Energy Research | KIER · Clean Fuel Department

Steam gasification of biomass is a promising method for producing high quality syngas for polygeneration. During the steam gasification, devolatilization and char reaction are key steps of syngas production and the contributions of the two reactions are highly related to gasification conditions. In this study, the transient characteristics of devol...

Coal water slurries (CWSs) are considered to be a new form of fuel that can alleviate the environmental and safety issues associated with use of bulk solid fuel. However, CWSs does not always fit into existing solid fuel supply and storage chain. In this study, a novel method to control CWSs viscosity using pH-responsive thickener was proposed, off...

A pure oxygen (O2) supply for oxy-fuel combustion causes excessive power consumption and decreased net plant efficiency. The oxygen carrier-aided oxy-circulating fluidized-bed combustion (OCA-Oxy-CFBC) process can facilitate reduction in the O2 supply requirement. Moreover, the use of an oxygen carrier, instead of silica sand, as bed materials may...

Utilization of municipal solid waste (MSW) non-recyclable combustible fractions abundant in mixed plastics such as solid recovered fuel (SRF) is becoming increasingly widespread due to its sustainability. This study investigates utilization of pelletized mixed plastic SRF using fluidized bed (FB) flash pyrolysis at high temperature, unlike previous...

The utilization of municipal solid waste combustible fractions as a fuel is generally preferred over landfilling. Fuels derived from waste materials, such as solid refuse fuel (SRF), can be utilized for energy generation using pyrolysis, gasification, and combustion. A three-dimensional computational fluid dynamics (CFD) model was developed for the...

For stable carbon capture utilization and storage, highly-pure CO2 content and low pollutant emissions must be maintained throughout oxy-coal firing operation; however, studies on combining absorbent addition and oxidant staging combustion to eliminate simultaneous nitrogen oxides (NO, N2O) and sulfur dioxide (SO2) have not been reported. According...

Globally, the demand for masks has increased due to the COVID-19 pandemic, resulting in 490,201 tons of waste masks disposed of per month. Since masks are used in places with a high risk of virus infection, waste masks retain the risk of virus contamination. In this study, a 1 kg/h lab-scale (diameter: 0.114 m, height: 1 m) bubbling fluidized bed g...

Three-dimensional computational fluid dynamics (CFD) modeling of the hydrodynamic characteristics for the various sand particle sizes (10 μm, 250 μm, 482 μm, 750 μm, 1000 μm, and the actual particle size distribution (PSD)) in a 0.1 MWth pilot-scale full-loop circulating fluidized bed combustor (CFBC) was numerically investigated with a commercial...

This study investigates the gasification characteristics of waste plastic (SRF; solid refuse fuel) and tar removal properties of activated carbon (AC) and olivine using 1 kg/h lab scale bubbling fluidized bed gasifier. The steam gasification was conducted at steam/carbon (S/C) ratio from 1.0 to 2.0 to increase the product gas quality. AC bed gas ve...

This study investigates air gasification properties of SRF with high content of residual mixed waste plastic in a 1 kg/h lab scale bubbling fluidized bed gasifier. Gasifier internal diameter is 0.114 m and its height is 1 m. Silica sand particles with a mean diameter of 400 μm is used as the bed material. During the gasification experiments the eff...

Biomass combustion in the oxy-fuel circulating fluidized bed is a promising technology to maximize the negative carbon dioxide emission and reduce pollutants emission in power plants. However, biomass ash related behaviors under oxy-combustion with kaolin additives still lack sufficient information. In this study, kaolin was used as an additive to...

Converting rice husk into energy is a promising method of generating renewable energy and reducing greenhouse gas emissions. The characteristics of rice husk gasification were investigated at an equivalence ratio (ER) of 0.20–0.35 and a gasifier temperature of 700–850 °C in a 20-tons-per-day (TPD) bubbling fluidized-bed gasifier system. The optimal...

Herein, we describe the design and operation of an indirect coal liquefaction plant with integrated coal-water slurry manufacturing, entrained flow gasification, Rectisol, and Fisher-Tropsch processes to produce liquid fuels for vehicles. The above plant contained an entrained flow gasifier (10 t/d test rig) operated using oxygen as a gasifying age...

Implementation of circulating fluidized bed (CFB) boilers in the energy sector has witnessed a steady increase owing to their afforded advantages of operational flexibility in terms of compliance with several low-grade fuels and in-situ DeSOx and DeNOx capabilities. In recent years, the rise in global warming and development of intermittent power-g...

Oxy-combustion with a circulating fluidized bed (Oxy-CFBC) can facilitate the separation of high CO2 concentration and reduce emissions by biomass co-firing. This study investigated Oxy-CFBC characteristics such as temperature, solid hold-up, flue gas concentrations including CO2, pollutant emissions (SO2, NO, and CO), combustion efficiency and ash...

To improve the fluidity of a coal water mixture (CWM) having lower viscosity and higher solid concentration, the effects of surfactants (five kinds) and experimental variables such as temperature (5-65 °C), pH (1-11), particle size distribution (PSD) on the viscosity characteristics of two different coals (Shenhua and Kideco Coal) were investigated...

The effects of plasma power (1-1.8kW), oxygen/fuel (0-2.5) and steam/fuel ratios (0-1) on the gasification characteristics of glass fiber-reinforced plastic (GFRP) wastes have been determined in a microwave plasma reactor. GFRP, which is thermosetting plastic composed of glass fibers embedded within a polymer matrix, was used as an experimental sam...

Hot gas cleaning of producer gas generated from a gasification process has many advantages in terms of thermal efficiency, gas-quality improvement, compact gas-cleaning devices, and economic feasibility. In this study, the characteristics of molten tin as a working fluid for hot gas cleaning were examined. To evaluate the hot gas cleaning performan...

By combining hydrolysis, it was observed that the maximum concentration of xylose+mannose+galactose (xmg) was 10.7g/L at a CS of 1.72. The aliphatic acid, aromatic acid and aldehydes were released 29.8, 0.45 and 0.90g/L from the black liquor at CS of 1.19, 1.72, and 2.19, respectively. In the gasification using bench-scale bubbling fluidized bed (B...

A molten metal was used as a working fluid of a circulating fluidized bed reator to enhance biomass thermo-chemical conversion. As a liquid bed material, molten metal has various advantages such as high thermal conductivity, low viscosity and potential to gas cleaning. Due to its fast heat transfer rate, molten metal can significantly increase the...

The possibility of a molten metal was investigated as a working fluid of pyrolysis system. The molten metal has various advantages such as high thermal conductivity, high heat capacity, wide operating range and low viscosity. Among many candidate metals, Tin was selected as a bed material since its physical characteristics are suitable for pyrolysi...

Highlights  A molten metal is used as a working fluid of biomass pyrolysis reactor.  The molten metal has various advantages like high thermal conductivity, low viscosity.  The reaction rate and product yield of the molten bed case are much higher than no bed.  The molten metal has potential to remove sulfur compound in the feedstock. Summary T...

Bio-refinery process is a promising option which produces bio-energy and sustainable eco-products simultaneously. The main process of pulp bio-refinery process is similar to existing petrochemical refinery process and it is composed of separation, liquid extraction, and fermentation by using the black liquor of a pulp mill. During the process, lign...

The possibility of using liquid metal as a working fluid of pyrolysis has been investigated. As a fluidized bed material, liquid metal has various advantages such as high thermal conductivity, high heat capacity, and low viscosity. In addition, comparing to traditional solid bed material, it is easy to handle and has potential to remove sulphur com...

The possibility of using liquid metal as a working fluid of pyrolysis has been investigated. As a fluidized bed material, liquid metal has various advantages such as high thermal conductivity, high heat capacity, and low viscosity. In addition, comparing to traditional solid bed material, it is easy to handle and has potential to remove sulphur com...

Production and utilization of producer gas from mixed plastic wastes were investigated in a pilot-scale moving-grate gasification process. A 500 kWth moving-grate gasifier was developed, including a flame-assisted tar reformer and sequential gas cleaning processes comprising a gas cooler, bag filter, and wet scrubber. The cleaned producer gas, comp...

Biomass resource is drawing attention as renewable energy source to substitute fossil fuels. In biomass conversion technologies, combustion process is a common method of converting biomass resources into heat and power. In various biomass resources, woody biomass is used mainly to convert energy. In this study, combustion performance of EFB (Empty...

Recently, since a ban on the dumping of raw sewage at sea has been established, proper use of sewage sludge has been received renewed interest. Among many approaches, using it as a fuel is a very promising option which could solve both environmental and energy problems. In this study, pyrolysis and gasification characteristics of the sewage sludge...

Recently, since a ban on the dumping of raw sewage at sea has been established, proper use of sewage sludge has been received renewed interest. Among many approaches, using it as a fuel is a very promising option which could solve both environmental and energy problems. In this study, pyrolysis and gasification characteristics of the sewage sludge...

Because of the high volatile content of biomass, devolatilization process, as well as char reaction, is very important in biomass gasification. In steam gasification, devolatilization begins at the early stage of the reaction and most of tar materials are generated. Without a gasification agent, carbon monoxide is the major product followed by carb...

Biomass gasification is a promising technology in terms of clean energy and flexible options for end use such as heat, steam, electricity, gaseous or liquid fuels. In a gasification process, reduction of tar is very important because it can cause any mechanical problems and small tar implies high energy efficiency. However, generation and conversio...

As main contaminants in the product gas of biomass gasification, tar should be reduced or reformed from the bio-syngas, and detailed understanding of tar generation characteristics is very important. In this research, differences of tar properties in devolatization and char gasification process are investigated. Korean pine wood chip was used as a...

As main contaminants in the product gas of biomass gasification, tar should be reduced or reformed from the bio-syngas, and detailed understanding of tar generation characteristics is very important. In this research, differences of tar properties in devolatization and char gasification process are investigated. Korean pine wood chip was used as a...

In this study, effect of steam on biomass gasification was investigated in a tube furnace. Korean pine wood chip was used as a feedstock, and syngas compositions and yield were monitored as a function of time by varying temperature and steam to biomass ratio. The gas composition was measured by NDIR and TCD gas analyzers and total gas yield was mon...

Performances of power generation engine were investigated with syngas from RPF. A stoker type, multi-staged pyrolysis-gasification system, was employed for syngas generation and the syngas was refined with the sequential cleaning processes composed of a gas cooler, a bag filter and a wet scrubber. 20 kWe commercial syngas power generation engine wa...