Jun Li

Nagoya University | Meidai · Department of Applied Chemistry, Chemical Engineering and Biotechnology

Thermochemical energy storage (TES) is a promising technology to overcome supply-demand mismatch in the recycling of low-grade industrial waste heat. A novel sorbent is developed for low-grade TES system by employing an ordered mesoporous carbon, CMK-3, as the matrix of CaCl2 hydrates. Expanded graphite (EG) and activated carbon (AC) as matrixes ar...

Thermochemical heat transformers (THT) can offer the potential for efficient energy storage and upgrade based on a reversible solid-gas reaction. A mechanical booster pump (MBP)-assisted water-based sorption thermochemical heat transformer driven by low-grade solar thermal energy is proposed to handle variations in the heat demand of buildings. The...

In this study, the influences of nano γ-Al2O3 on the thermal storage performance of LiCl were experimentally investigated. The XRD results show that a complex of lithium aluminium oxychloride (LiAlOCl2) was formed through the LiCl·H2O and γ-Al2O3 composites preparation process. The in situ diffuse reflectance infrared Fourier transform spectroscopy...

Ammonia is an attractive clean fuel for its potential to reduce CO2 emission and fossil fuel consumption. However, ammonia combustion has been mainly discouraged by the low flammability and the high fuel NOx emissions. This study numerically investigates the effects of swirl intensity on combustion characteristics in swirl-stabilized ammonia/methan...

Hydrated salt CaCl2 is a promising material for low-grade thermochemical heat storage. To improve cyclic stability of the material, porous matrixes are usually employed to synthesize CaCl2/matrix composites. However, the multi-step reaction of the salt and multi-form sorption of the composites increase the complexity during the practical applicatio...

Due to the high hydrogen density and carbon-free characteristics of ammonia, porous media burners fueled by ammonia are currently attracting more and more attention in small and medium combustion/power equipment. In this study, the effects of pure ammonia combustion and hydrogen addition on ammonia combustion in a porous burner are investigated by...

Open air channels coated with porous desiccant are widely applied in solid desiccant cooling systems. In this study, the isothermal adsorption and desorption characteristics of silica gel coated single-channel adsorber were investigated. A modified LDF model considering air- and solid-side resistances was derived to evaluate the kinetics and estima...

To assure stable and dependable functioning of the thermochemical energy storage (TCES) system under unstable low-grade heat temperatures, three mechanical booster pump-assisted TCES (MBP-assisted TCES) modes operating with SrBr2·H2O/H2O, LiOH/H2O, and CaCl2·H2O/H2O are proposed for the application of heat storage and upgrading. The operating modes...

A porous MnO2/CeO2 composite catalyst was prepared via the template method for the catalytic decomposition of formaldehyde (HCHO). The physical and chemical properties of the catalysts were intensively characterized via X-ray diffraction, transmission electron microscopy, Brunauer-Emmett-Teller analysis, temperature programmed reduction system and...

Desiccant coated heat exchanger (DCHE) systems have significant potential in improving dehumidification performance. The moisture transfer occurring in one single air channel of DCHE can dominate the overall system performance. In this study, the adsorber with an approximate air channel of DCHE was designed to experimentally investigate the kinetic...

A comprehensive review of combustion characteristics of ammonia (NH3) as a carbon free fuel is presented. NH3 is an attractive alternative fuel candidate to reduce the consumption of fossil fuel and the emission of CO2, soot, and hydrocarbon pollutants, due to its comparable combustion properties, productivities from renewable sources, and storage...

To improve the heat and mass transfer efficiency of salts hydrated-TCS, the 3D graphene (3D-GF)-phytic acid (PA) and 3D-GF-ascorbic acid (AA) were added in LiOH to make chemical heat storage performance of composites better. It is proven that the combination and release rate of AA modified composite with H2O is faster and stronger, and it has a hig...

3D‐GF modified with different additive concentrations (phytic acid (PA) and ascorbic acid (AA)) is developed and then combined with different LiOH contents by the hydrothermal method to obtain composite materials. It can be found that the addition of PA and AA will not destroy the carbon skeleton structure of 3D‐GF. With the increasing additive con...

Air-cooled desiccant coated cross-flow heat exchanger (DCCFHE) system provides a simple and effective approach to improve dehumidification performance by using cooling air to remove adsorption heat during adsorption process. In this study, a novel numerical model validated by experimental data was established to predict the performance of a convent...

As a key parameter of a chemical heat storage material, the hydration and dehydration reaction characteristics of lithium hydroxide (LiOH) at pure vapor condition is unclear. In this study, we focused on the hydration reaction and dehydration process of LiOH at the pure vapor condition. The pressure–temperature diagram of LiOH equilibrium was measu...

Desiccant dehumidification systems provide an environment-friendly and energy-saving option for air humidity regulation. The dehumidification wheel as the key component occurring mass transfer process determines the dehumidification performance of the systems. In this study, a two-dimension numerical model was developed to conduct parameter studies...

As a key parameter of fuel, the heat release characteristics of ammonia (NH 3 ) flames under hydrogen (H 2 )-enriched conditions constitute the emphasis of this research. The effect of H 2 addition on heat release characteristics of premixed laminar NH 3 flames are numerically investigated by considering the detailed chemical mechanism. The NH 3 ,...

A series of experimental investigations had been performed to analyze the heat and mass transfer performance for two novel types of silica-based consolidated composite adsorbents developed by the freeze-drying method. The first type of adsorbent is silica gel consolidated with carboxymethyl cellulose (CMC) (SC), while the other is silica gel consol...

Hydrogen (H2) is considered as a carbon-free alternative fuel. The heat release characteristics of H2 flame as a key parameter in its combustion process are unclear. In this study, the combustion and heat release characteristics of H2/air diffusion flame on a micro-jet array burner were experimentally and numerically investigated. It is shown that...

Lithium hydroxide monohydrate based thermochemical heat storage materials were modified with in situ formed 3D-nickel-carbon nanotubes (Ni-CNTs). The nanoscale (5–15 nm) LiOH·H2O particles were well dispersed in the composite formed with Ni-CNTs. These composite materials exhibited improved heat storage capacity, thermal conductivity, and hydration...

Increasing concern about the air pollution caused by sulfur dioxide (SO2) from diesel exhaust has resulted in the improvement of low-temperature desulfurization materials for the combined SO2 trap. In this study, coconut shell activated carbon (AC) is pretreated by nitric acid to prepare MnO2-based activated carbon materials for SO2 removal. The pr...

Hydrogen (H2) has been considered as a sustainable alternative carbon-free fuel. The applications of H2 in various energy devices, such as fuel cell, internal combustion engine, have drawn many interests. However, the application of H2 on industrial burner for thermal supply has not widely applied. Therefore, to develop a H2 designated burner for t...

Lithium hydroxide monohydrate was modified by impregnation method with hygroscopic materials, such as polyethylene glycol (PEG), lithium chloride (LiCl), 13X-zeolite and NaY-zeolite. The lithium hydroxide monohydrate particles were well dispersed into nanoscale as composed with 13X-zeolite and NaY-zeolite. These composite materials exhibited obviou...

Combustion and heat release characteristics of biogas non-premixed flames under various hydrogen-enriched and oxygen-enriched conditions were investigated through chemical kinetics simulation using detailed chemical mechanisms. The heat release rates, chemical reaction rates, and molar fraction of all species of biogas at various methane contents (...

Adsorption refrigeration is considered a green refrigeration technology that can be driven by a low-grade heat source to generate cooling power. However, the large bulk of adsorption chillers can limit its use especially automobiles. The size of the adsorption chiller is a very important consideration for applying in the automobile. The new type of...

Large amounts of waste heat below 100˚C from the industrial sector are released into the atmosphere. It has been suggested that energy system efficiency can be increased with adsorption chillers. However, the cooling power and coefficient of performance (COP) of conventional adsorption chillers significantly decrease with the desorption temperature...

Carbon nanospheres (CNSs) and multi-walled carbon nanotubes (MWCNTs) as nanoadditives were used to modify lithium hydroxide monohydrate for low temperature chemical heat storage application. The lithium hydroxide monohydrate particles were well dispersed on the nanoscale level, and the diameter of nanoparticles was about 20–30 nm in the case of the...

Increasing concern about sulfur dioxide (SO2) from diesel vehicle exhausts causing detrimental effects on NOx removal catalysts has resulted in the development of dry desulfurization filters for complete removal of SO2. In this study, a compact MnO2 filter was developed for diesel emission control. The SO2-capture behavior of the compact MnO2 filte...

This study focuses on the application of NH3 as a carbon-free alternative fuel in internal combustion devices. The two key parameters for fuel combustion, namely, laminar burning velocity and ignition delay time of the NH3 flame at various H2 blending levels, are numerically investigated. Results show that the selected modified Dagaut-Kéromnès mech...

Growing concern about the removal of sulfur dioxide (SO2) from combustion exhaust has resulted in the development of desulfurization materials for a SO2 trap. In this study, a manganese dioxide/activated carbon (MnO2/AC) composite was proposed as a low temperature desulfurization material for a combined SO2 trap. The MnO2/AC composite was synthesiz...

A new porous-resin-supported calcium sulfate (CaSO4-PSM) material with high-density and high reactivity for chemical heat storage is developed and characterized. The newly developed CaSO4-PSM exhibits a higher reactivity than normal CaSO4. Furthermore, the particle diameter is an important factor for the development of new chemical thermal energy s...

The two-stage adsorption refrigeration system can lower the heat source temperature of the adsorption chiller obviously. But the mass transfer performance of two-stage adsorption refrigeration system with single adsorbent may degrade compared to the common adsorption refrigeration. It was that applying different adsorbent to the two-stage adsorptio...

The present study focuses on determining the potential applicability of ammonia (NH3) as a carbon-free alternative fuel through numerical simulations. The combustion and emissions characteristics of premixed NH3–air flame at preheating conditions were numerically investigated. The burning velocity and all species mole fraction were determined using...

In order to improve the combustion characteristics and flame stability of NH3-air flame, preheating the reactants at different temperature was proposed in this study. We focused on the formation of NO at NH3 preheated combustion because NH3 is a typical fuel-nitrogen. The NO formation characteristics of premixed NH3-air mixtures at various preheati...

As a key parameter for a fuel in real combustion development, burning velocity of NH3 which is usually low limits its application in the energy device. In this study, the combustion of NH3 at oxygen enriched condition has been proposed as a novel method for improving NH3 combustion. The oxygen concentration in the combustion air was varied from 21%...

The effect of adding hydrogen to methane on the emission and heat transfer characteristics of a laminar diffusion flame was investigated. The total input thermal energy for each test was kept constant. The results showed that adding hydrogen increased the temperature, decreased the flame length, and significantly increased the soot-free length frac...

This study evaluates the performance of a molten carbonate fuel cell and micro gas turbine (MCFC/MGT) hybrid power system bi-fueled by city gas and biogas. The performance of the MCFC/MGT hybrid power system and MFCF/MGT hybrid power system response have been investigated experimentally and numerically. Results show that the MCFC, steam reformer, a...

This paper evaluates the potential of hydrogen (H2) and ammonia (NH3) as carbon-free fuels. The combustion characteristics and NOx formation in the combustion of H2 and NH3 at different air-fuel equivalence ratios and initial H2 concentrations in the fuel gas were experimentally studied. NH3 burning velocity improved because of increased amounts of...

Burning velocity and NOx formation in the combustion of NH_3 mixed with H_2 at different air-fuel equivalence ratios and different H_2/NH_3 ratio were experimentally studied in this research. NH_3 burning velocity increased with increase of amount of H atom in the flame with the addition of H_2. Burning velocity of H_2/NH_3-air changed with the H_2...

Rapid pyrolysis of three typical Chinese coals, lignite from Inner Mongolia, bituminous from Shenfu coalfield, and anthracite from Guizhou, as well as a petroleum coke were carried out in a drop-style high-frequency furnace. The reactor was induction coil heated and had a very small high-temperature zone, which could restrain secondary conversions...

Rapid pyrolysis of 6 biomass/coal blends (1:4, wt) including rice straw + bituminous (RS + B), rice straw + anthracite (RS + A), chinar leaves + bituminous (CL + B), chinar leaves + anthracite (CL + A), pine sawdust + bituminous (PS + B), and pine sawdust + anthracite (PS + A) was carried out in a high-frequency magnetic field based furnace at 600–...

The char of three typical biomasses, rice straw char (RS char), chinar leaves char (CL char), and pine sawdust char (PS char), was prepared in a high-frequency furnace, which could efficiently reduce secondary reactions under rapid pyrolysis conditions at 800−1200 °C. The rapid pyrolysis char produced was isothermally gasified in a thermogravimetri...

HCN (hydrocyanic acid) and NH3 (ammonia) (including HNCO (isocyanic acid)) released during rapid pyrolysis of three biomass samples (rice straw, chinar leaves, pine sawdust) and a nitrogen rich material (soybean cake) were measured. The pyrolysis runs were conducted at 600−1200 °C using a high-frequency furnace. Much more HCN than NH3 was released...