Jicheng Bi

• PhD
• Group Leader at Chinese Academy of Sciences

Coal catalytic hydrogasification (CCHG) is a straightforward approach for producing CH 4 , which shows advantages over the mature coal-to-CH 4 technologies from the perspectives of CH 4 yield, thermal efficiency, and CO 2 emission. The core of CCHG is to make carbon in coal convert into CH 4 efficiently with a catalyst. In the past decades, intensi...

Catalytic hydrogasification (C + H2 → CH4) is an efficient process for methane production from coal. To reduce reactant hydrogen cost, cheap crude gas from coal gasifier without further treatment is proposed to replace hydrogen for the process. In this study, the effect of steam in crude gas on Co–Ca bimetal catalyzed coal hydrogasification was in...

Pressurized fluidized bed coal catalytic hydrogasification is a promising coal-to-SNG technology. Its scale-up faces some challenges, such as hot-spot controlling, particle-size selection, and char residue discharging. Pressure is recognized as a critical influencing factor. In order to reveal the pressure effects, numerical simulations are carried...

Hydrogasification (C + H2 → CH4) is a crucial reaction for obtaining CH4 from coal or biomass. However, the reaction is sluggish in the absence of a suitable catalyst. Cobalt is more catalytically active than iron, nickel, and alkali metals, but is expensive. To improve the process economy, catalyst recycling was investigated with a focus on cobalt...

Coal catalytic hydrogasification (CCHG) is a promising approach for producing substituted natural gas by using pure hydrogen as a gasifying agent. If pure hydrogen could be replaced by cheaper crude gas from the coal gasifier, the economy of CCHG would be significantly improved. However, the composition of crude gas is complicated because in additi...

Catalytic hydrogasification of pulverized coal was performed using a pressurized fluidized bed to investigate the effect of experimental variables including catalyst additives, temperature (600–850 °C) and hydrogen (H2) pressure (0.6–3.0 MPa) on the catalytic behavior of cobalt (Co) and formation profiles of target products, i.e., methane (CH4) and...

The catalytic hydrogasification of activated carbon/bituminous char/anthracite char with the different catalysts were performed in a pressurized thermogravimetry analysis (PTGA). The GC, BET were used to characterize the physical structure and chemical reaction process ofcarbon. The function principle of Co to the carbon-hydrogen reaction was preli...

Coal catalytic hydrogasification (CCHG) is an efficient approach to produce CH4 with high yield and high thermal efficiency. A numerical modelling of CCHG in a pressurized bubbling fluidized bed has been conducted to track the whole reaction process by using the multiphase particle-in-cell (MP-PIC) algorithm during the residence time of particles....

Coal catalytic hydrogasification is an efficient approach to produce CH4. This study investigated hydrogasification characteristic of coal with diverse properties (caking propensity, high rank and sulfur content) in a pressurized fluidized bed. The approaches to realize high CH4 yield and stable fluidization were explored. Experimental results show...

Cobalt and nickel exhibit excellent catalytic properties in coal hydrogenation, which makes these metals potentially attractive as coal hydrogasification catalysts. However, cobalt and nickel are quite expensive. Herein, a relatively cheap copper catalysts are investigated for coal/char catalytic hydrogasification in a pressurized fixed-bed reactor...

Pectin is a family of galacturonic acid-rich polysaccharides, which mostly exists in plant cell walls. Pectin structure determines its properties, and the structure characteristics usually refer to the molecular weight, degree of methoxylation and acetylation, galacturonic acid content, neutral sugar composition. The texture and rheological propert...

The gasification of Zhaotong lignite was performed with the different alkaline metal catalysts such as KOH, NaOH, K2CO3 and Na2CO3 under the supercritical water at the metal/carbon ratio of 0.037, and the behavior of the alkaline metal was also investigated. The results show that potassium has better catalytic activity than sodium. KOH can not only...

The sodium release and transformation of Yili (YL) and Hutubi (HTB) coal were examined at different temperatures under N2, CO2 and H2O atmospheres. By using sequential extraction and wet digestion separately, the occurrence mode and content of sodium in raw coal and chars were measured. The migration of sodium in two coals was studied qualitatively...

Parameters of pulsed sudden decompression flashed drying and their effects on quality of dried guava were investigated, including color, hardness, rehydration ratio, total phenolic content, total flavonoid content and antioxidant activity. The product quality indexes were concentrated using factor analysis. Moreover, the relations between process p...

Box-Behnken design was adopted to optimize the drying conditions of pulsed sudden decompression flashing drying combining with medium-shortwave infrared radiation for shiitake mushroom based on single factor. This paper analyzed the effect of pre-drying moisture content, evacuated temperature, evacuated time and the interaction of the three factors...

Restructured potatoes chips were prepared by using hot air coupled with instant controlled pressure drop drying with the principal raw material of potatoes and carrots,adding various excipients including sucrose,maltitol and soybean protein,etc.The effects of different formula on the quality of the restructured potato chips were studied.Significant...

Coal hydrogasification processes including wire-mesh grid reactor, batch reactor, curie-point pyrolyzer, fixed bed reactor and so on were utilized or developed in laboratory researches. Although the experimental results could help to understand the basic behavior of coal hydrogasification, it was difficult to directly utilize such data for devising...

In order to understand the influence of drying methods on hosui pear chips, the effects of drying methods including hot air drying (HAD), med-and short-wave infrared radiation drying (MIRD), vacuum drying (VD), vacuum freezing drying (FD), hot air-pulsed sudden decompression flashing drying (HA-PSDFD), med-and short-wave infrared radiation-pulsed s...

The catalytic hydrogasification of the sub-bituminous coal was carried out in a lab-scale pressurized fluidized bed with the Co-Ca, Ni-Ca and Fe-Ca as catalysts at 850 °C and 3 MPa. The effect of different catalysts on the characteristics of gasification products was investigated, and the behavior of the catalysts was also explored by means of the...

In the present paper, drying parameters were optimized for guava by pulsed sudden decompression flashed drying in order to rich the variety of guava product and improve the quality of dried guava. Firstly, the osmotic dehydration time was determined. Secondly, the Box-Behnken center design was applied to analyze the impact of process parameters (pu...

The texture or rheological properties of many fruits and vegetable depend largely on the pectin content and composition during processing or in the final status. Pectin are the most unstable polymers in the cell wall matrix, the changes of the structure not only render to the modification of the function, but also closely correlated with product's...

The physical, nutritional and antioxidant properties of five types superfine grinding garlic powder obtained by hot air drying (HAD), middle and short infrared drying (IRD), hot air- explosion puffing drying (HA-EPD), middle and short infrared-explosion puffing drying (IR-EPD) and vacuum freezing drying (FD) were studied. From physical properties,...

A Ni/ZnO system was prepared by coprecipitation and characterized after reduction at different temperatures (350, 400, 450 and 500 oC) using TG-MS, H2-TPR, N2 physisorption, XRD, SEM, H2 and CO chemisorption, TEM, EPR and XPS. H2 and CO chemisorption experiments combining with XRD, SEM and TEM analysis showed evidence for strong metal-support inter...

The calcium as a promoter in iron-catalyzed hydrogasification of sub-bituminous coal was studied to examine the catalytic activity of the Fe-Ca dual systems at H2 pressure 0.1–3.0 MPa, temperature 650–750 °C. Experimental results showed that the yields of light aromatic hydrocarbons (LAHs) and methane (synthetic natural gas, SNG) could be greatly i...

The effects of low temperature eutectics (LTEs) in SiO2-A12O3-CaO/FeO on the slagging characteristics were comprehensively studied in the light of ternary phase diagram of 264 typical coal samples; and two novel criteria for coal ash slagging characteristics were proposed. The results show that LTEs are essential reason inducing the coal ash slaggi...

In this study, catalytic steam gasification of high ash fusion temperature coal using K2CO3 as catalyst was carried out in a pressurized fixed bed. The potassium catalyst recovery was also conducted via wash and digestion by Ca (OH)2. It turned out that increasing temperature and K2CO3 loading enhanced the carbon conversion and CH4 yield. At 800℃ a...

Rapid pyrolysis of several types of solid carbonaceous materials (lignite, bituminous coal and petroleum coke) was conducted in a drop-tube furnace at 1300 ℃ under atmospheric pressure. Soot properties, including yield, particle size, microstructure and reactivity, were studied, with focus on the key factors that influence soot gasification reactiv...

The effects of K2CO3 and atmospheres on sulfur distribution and forms during pressurized coal pyrolysis were investigated in a lab-scale reactor. The results show that K2CO3 increases the sulfur remained in char by capturing H2S during coal pyrolysis. The surface of the coal char is activated in the presence of K2CO3, and then the nascent sulfur re...

The catalytic gasification performance of Buliangou coal using Ca(OH)2 as catalyst was investigated at 3.5 MPa and 700-800℃ in a pressurized fixed bed. The effect of gasification temperature, Ca(OH)2 loading and loading method on coal steam gasification and methanation reaction were examined. The results show that Ca(OH)2 can enhance the reactivity...

The ash sintering behaviour of a Chinese lignite (LLI) with different amounts of CaCO3 addition during K2CO3-catalysed gasification was investigated. 0?10 wt% K2CO3 was doped into the lignite for catalytic gasification, and CaCO3 was added into the K2CO3-doped samples, varying in the range of 0?20 wt% relative to the lignite, for understanding its...

Coal ash fusion temperature is important for large-scale gasifier/boiler designers and operators. There has been a big error for fusion temperature calculated by chemical composition of coal ash because the ash is composed of minerals actually, which has a strong impact on fusion temperature. A new calculation method, based on chemical composition...

To determine the ash characteristics, catalysts transformation and the sintering mechanism during catalytic coal gasification, the investigation of the effect of ashing temperature, K2CO3 and CaO catalysts addition on the ash sintering behaviour of bituminous coal was conducted under catalytic gasification condition. The ash sintering temperature w...

In order to investigate the cold flow field on the multi nozzle impinging coal hydrogenation entrained flow bed, the cold model of a stream bed was established based on the 3 t/d thermal coal hydrogenation gasifier. The three-dimensional particle dynamic analyzer (3D-PDA) was used to measure the velocity of the fluid in the model and the flow behav...

The structure of the coal chars with and without catalyst was characterized using X-ray diffraction and laser Raman techniques. The catalyst changes the structure of the organic unit in coal char. The mechanism by which the catalyst affects the structure of coal char in pyrolysis was investigated by X-ray photoelectron spectroscopy. For the first t...

The influences of temperature, time, and mineral matter on conversion of lignite in a semi-continuous supercritical water reactor (SCWR) were investigated. The evolution of pore during reaction in SCWR was deduced with Fourier transform infrared and Raman spectra characterization. It is found that supercritical water can quickly extract the volatil...

A Ni-dolomite catalyst with promoter Lanthanum was prepared by kneading method. The catalyst was used for the cracking reaction of tar model compound containing N-dodecane, cyclohexane, toluene and methylnaphthalene in an atmospheric fixed reactor. The effects of temperature, space velocity and the ratio of water and ingredient on the yield of gas...

A series of experiments on co-pyrolysis of subbituminous coal/corn stalk blends with solid heat carrier (boiler ash) were carried out in a bench-scale moving bed pyrolyzer with different biomass blending ratios at different temperatures. Deviation of gaseous, liquid and char products yields between experimental values and calculated ones was discus...

The agglomeration of potassium-loaded Wangjiata coal during catalytic coal gasification (CCG) was investigated in a bench-scale pressurized fluidized bed. The pressurized pressure-drop sintering technique was employed to understand sintering characteristic in a CO/H2/H2O mixture atmosphere at 3.5 MPa. The ash, which was removed the water-soluble po...

Pyrolysis of corn stalk with a solid heat carrier was studied under temperatures ranging from 430 to 620 degrees C. The solid heat carrier used was high-temperature ash from a CFB boiler. The yields of three products and their characteristics were investigated. Moreover, the distributions of sulfur and nitrogen in the products were determined. The...

The invention relates to a gasifier comprising a syngas generation section, a coal methanation section and a syngas methanation section in the order from bottom to top. The invention also relates to a process for preparing methane by catalytically gasifying coal using such a gasifier. Optionally, the gasifier is additionally provided with a coal py...

A homemade pressurized pressure-drop measuring device and X-ray diffractometer (XRD) analyzer were used to determine the effects of alkali catalyst addition and different chemical compositions of nine kinds of coal ashes on the ash sintering temperature. The results show that the sintering temperature of WJT coal ash containing higher Fe and Ca com...

Agglomeration in fluidized bed gasification system is considered as a primary operational problem, especially for catalytic coal gasification process because alkali catalyst worsens sintering and slagging. The optimal condition from the experiments will ensure the operation of coal gasification below sintering temperature and make the fluidized bed...

Low-rank coal chars with different structures were prepared in a fixed-bed pyrolyzer. These coal chars were activated in a semi-continuous tubular supercritical water (SCW) reactor to produce activated carbon. Raman spectra data showed that the amount of aromatic carbon increased with pyrolysis temperature. After SCW activation, smaller aromatic ri...

We report here the ash sintering characteristics of LLI lignite with added bauxite during K2CO3-catalyzed steam gasification. The ash samples were prepared using a catalytic gasification system at 1123 K under a steam atmosphere with a carrier gas of N2. The ash sintering temperature was determined using a pressure-drop sintering device in inert N2...

The research on the issue of material corrosion in catalytic coal gasifier was focused on, in which the potassium carbonate and the coal ash from catalytic coal gasification with high alkali content were used to test the corrosion to the corundum refractory. The corundum refractory corroded by alkali metals at different reaction atmospheres, temper...

In this study, 13 types of organic materials were oxidized using H2O2 in a continuous flow reactor under the condition of supercritical water. The effect of the operational parameters on the conversion of total organic carbon (TOC) and total nitrogen (TN) was investigated, and the resulting quality of treated water was analyzed. It was found that t...

The catalytic performance of coal char loaded with potassium carbonate on the CO methanation reaction was investigated in a pressurized fixed bed reactor. The results show that the catalytic activities of raw coal pyrolysis char and demineralized coal pyrolysis char are very low, while with loading 10% potassium carbonate, the catalytic activity of...

The gasification tests of Shenmu coal char were carried out in a pressured fixed bed reactor to investigate the effect of gasification agents (H2O, CO2, H2), catalyst loading, and partial pressure of hydrogen and carbon monoxide on the carbon conversion and reaction rate. The results show that the heterogeneous reaction rate is in the order of C-H2...

A mathematics model was established to simulate the pressurized jetting fluidized bed gasifier of catalytic coal gasification to synthesis natural gas. The gasifier is simply divided into three zones: grid zone, bubble zone and freeboard zone. It is based on a one-dimensional steady-state model which considers the effects of pressured hydrodynamics...

The cotton printing and dyeing wastewater obtained from a printing and dyeing mill was treated by supercritical water oxidation (SCWO) in a continuous-flow reactor. The experiments were operated between 400 and 600°C, 25 MPa was selected as a suitable pressure, hydrogen peroxide (H2O2) was used as an oxygen source, and excess oxygen varied from 0 t...

The catalytic coal gasification over catalysts with different species and loadings of alkali metals was carried out autothermally in a fluidized bed gasifier with refractory lining. The feasibility of using burning coal to provide enough reaction heat for the catalytic gasification and the operating conditions for keeping steady state running were...

The effects of CaO addition and temperature on decarboxylation of stearic acid over Pt/C catalyst in subcritical water were investigated. The conversion of stearic acid increased dramatically, while the selectivity to heptadecane hardly changed with the addition of CaO. At 330°C the conversion of stearic acid reached a maximum with Ca/stearic mol r...

Oxidation of the textiles dyeing wastewater was studied in a continuous-flow reactor that was operated between 400 and 650°C at a fixed pressure of 25 MPa. The total organic carbon (TOC) concentration of the raw wastewater was in the 112.52 mmol/L . Hydrogen peroxide (H2O2) was used as an oxygen source. According to the wastewater and oxidant conce...

A number simulation study is conducted for catalytic coal gasification in pressured jetting fluidized bed. The gasifier is divided into three parts: grid zone, bubble zone and freeboard zone. It is based on a steady-state model which takes account of pressured hydrodynamics, mass and heat transfers and catalytic reaction kinetics. The model is firs...

The catalytic coal gasification reactivity has been studied in a bench scale pressurized fluidized bed, catalyst water washing recovery from the gasification residue was carried out with deionized water, and agglomeration was detected by pressurized pressure-drop sintering technique at 3.5MPa, the results found that for potassium-catalysed steam ga...

Rapid pyrolysis of several types of solid carbonaceous materials (lignite, bituminous coal, and petroleum coke) was conducted in a drop-tube furnace at elevated temperatures under ambient pressure. Special attention was paid to the dependence of the yield and gasification reactivity of soot on fuel type. Solid products, soot and char, were sufficie...

Supercritical water oxidation (SCWO) of the dyeing wastewater was studied in a continuous flow reactor with a temperature of 400-600°C and a fixed pressure of 25 MPa. Hydrogen peroxide (H2O2) was used as oxidant. The residence times of the reaction were 15-45s. The concentrations of the wastewater are characterized by total organic carbon (TOC). Th...

The sintering temperature declines with pressure increase, The sintering temperature is lower in reducing atmosphere than in oxidizing atmosphere. Effect of water vapor on decreasing sintering temperature is significant, The coal with higher content of silicon, aluminum and lower content of calcium, iron in ash, is not easy to slag during gasificat...

A process of light oil recovery from oil-shale pyrolysis gas by using active carbon fiber adsorption was explored, and a moving-bed pyrolysis apparatus and a light oil recovering system were set up. By cooling the gas to room temperature and condensation, more than 20 g/m 3 of light oil faction during the pyrolysis of Huadian oil shale are obtained...

A fixed-bed experimental apparatus with the capacity of 1kg coal was set up for coal pyrolysis by solid heat carrier. Shenmu bituminous coal and quartz sand was used as raw material and solid heat carrier respectively. The effects of initial temperature of solid heat carrier, reaction time and blending ratio on the yield of gas and tar were examine...

The reaction of CaCl 2 solution with CO 2 in ternary amine was studied. In this multiphase reaction, calcium carbonate yield and amine extraction efficiency increased with the increase of CO 2 pressure and CaCl 2 concentration. The equilibrium of the reaction was analyzed by thermodynamics model coupled with Pitzer electrolytic solution model and a...

The leaching of forsterite and serpentine was investigated and the effects of hydrochloric acid concentration and temperature were examined. Magnesium dissolution extent increases with the increase of hydrochloric acid concentration and temperature. The reactivity of forsterite is relative higher than that of serpentine. Furthermore, a modified unr...

Pyrolysis of coal-tar asphaltene, the main active component of coal tar in supercritical water (SCW), is investigated to further understand the upgrading mechanism of coal tar. It is found that coal-tar asphaltene convert to gas, maltene and char both in N2 and in SCW, but the conversion of coal-tar asphaltene and the yield of maltene in SCW are si...

Pyrolysis of Huolinhe lignite with solid heat carrier was carried out in a moving bed reactor with the capacity of 10 kg/h. The solid heat carrier used in the experiment was the circulating ash from a 75 t/h CFB boiler. The effects of pyrolysis temperature, residence time and coal particle size on the yields and composition of products were studied...

Tests for producing hydrogen-rich gas from lignite was carried out in a continuous supercritical water reactor using 20% coal-water slurry as feed and hydrogen peroxide as oxidant. The effect of hydrogen peroxide on the production of hydrogen was investigated. Results showed that the carbon gasification rate, hydrogen yield could be increased, and...

A pilot polygeneration process of a 75 t h–1 circulating fluidized bed (CFB) boiler combined with a moving bed coal pyrolyzer was developed based on laboratory-scale experimental results. The process operation showed good consistency and integration between boiler and pyrolyzer. Some critical operating parameters such as hot ash split flow from the...

A supercritical water reactor with throughput of 10 kg/h was set up, which was operated with continuous feeding of coal water slurry. The effects of reaction temperature (500–650 °C), pressure (20.0–30.0 MPa), Ca/C molar ratio (0–0.45) and O/C molar ratio (0–0.35) on the hydrogen generation characteristics were investigated. It is found that there...

Hydrogen-rich gas production from Chinese Xiaolongtan lignite was performed in a continuous supercritical water reactor with feeding of coal water slurry. The effects of KOH/coal weight ratio, temperature and pressure on carbon gasification efficiency, product distribution and yields of gas were investigated. At KOH/coal weight ratio of 4.1% (600°C...

The transformation of sulfur was experimentally investigated in a polygeneration process that integrated coal combustion and pyrolysis. High-sulfur Yanzhou coal was pyrolyzed together with circulating ash in a fixed bed. The circulating ash not only fixed some of gaseous sulfur but also decreased the sulfur remained in char compared with coal pyrol...

A new CO2 sequestration approach through indirect wollastonite carbonation is proposed to mitigate anthropogenic CO2 emissions from fossil fuel combustion. The wollastonite carbonation process includes three steps: (1) dissolution of wollastonite in hydrochloric acid to leach Ca2+ from mineral matrix; (2) reaction of the resulting CaCl2 solution wi...

Self developed was an intermittent type solid heat carrier pyrolysis plant with a self-processing capacity of 1 kg coal. Furthermore, with bituminous coal of a high volatile content and quartz sand serving as the raw material and heat carrier respectively, a pyrolysis characteristics evaluation experiment was performed. It has been found that with...

The main results of an experimental work on co-gasification of a Chinese bituminous coal and two types of biomass in a bench-scale fluidized bed are reported in the present study. Experiments were performed at different oxygen equivalence ratio, steam/carbon ratio and biomass/coal ratio. In addition, stabilization of co-gasification process was inv...

The flow characteristics of the high temperature circulating ash were studied on the cold test rig of the circulating fluidized bed (CFB) bi-rector for combustion and pyrolysis. Results show that with the increase of the apparent gas velocity in the riser, there is little change in negative pressure gradient in the standpipe. While with the increas...

Two kinds of coking wastewater were treated by supercritical water oxidation (SCWO) in a continuous-flow reactor using hydrogen peroxide (H2O2) as an oxidant. These wastewater contained high concentrations of ammonia nitrogen (NH3–N), phenol, chemical oxygen demand (COD) and inorganic salts. A salt separator was applied for the separation of salts...

Hydrogen rich gas production from sludge and heavy metal elements transition in supercritical water were studied using a batch reactor. A series of factors, such as temperature (773-923 K), pressure (22.8-37 MPa), reaction time (1-36 min), water/sludge weight ratio and catalyst (calcium hydroxide) on sludge conversion were investigated. The experim...

In this paper, hydrogen rich gas production from sludge and heavy metal elements transition in supercritical water is researched using a batch reactor. A series of factors are investigated, such as temperature (773~923 K), pressure (22.8~37 MPa), reaction time (1~36 min) and water/sludge weight ratio on gas composition and yield. The experimental r...

To obtain safflower essential oil and carthamin from safflower dreg by supercritical CO2 two-step extraction, a series operational parameters of pressure, temperature and CO2 flow rate were investigated in a bench-scale apparatus. The result shows that the rise of CO2 flow rate and the decrease of temperature lead to the increase in extraction rate...

Safflower seed oil extraction with supercritical CO2 at series operational parameters of pressure, temperature, flow rate and particle size was investigated in a bench scale apparatus. The results show that the extraction yields plotted as a function of time are significantly affected by the extraction pressure, flow rate and particle size, but ext...

The upgrading of high-temperature coal tar in supercritical water (SCW) was investigated using an autoclave reactor. The effects of temperature (673–753 K), pressure (24–38 MPa) and residence time (1–80 min) on product distribution were studied. The yields and characteristics of products in SCW were compared with those obtained in N2. In order to s...

In order to study the stability of circulation fluidized bed (CFB) combined with a coal pyrolysis reactor, the ash of power plant was used as experimental material in the cold mold reactor system. The riser column was 100 mm in inside diameter, 6.7 m in height. And the standpipe attached to the pyrolysis chamber was 44 mm in inside diameter, 3 m in...

The effects of the addition of CaO, temperature, and residence time on the conversion and product yields of a high-ash peat in supercritical water was investigated. The experiments were carried out in an autoclave in the temperature range of 623–773 K at pressure up to 30 MPa. At a Ca/C molar ratio of 0.46, almost no CO2 remained in gas phase. It w...

For the production of hydrogen from lignite, a Supercritical Water (SCW) reactor with a coal feed rate of 1 kg/h was set up, which was operated with continuous feeding of coal water slurry. The effects of reaction temperature (500°C-650°C), pressure (20 MPa-30 MPa), slurry concentration (20%-50%) and catalyst loading amount (0%-1% of coal) on the h...

Experimental studies on the fluidization characteristics of biomass char, coal char and coal ash were carried out in a fluidized bed column with diameter of 115 mm and height of 1000 mm. The experimental results showed that single biomass chars were difficult to be fluidized, while a good fluidization could be gained with the addition of coal char...

For the development of a process of low temperature coal pyrolysis combined with CFBC, a hot moving-bed facility with a capacity 10kg/h of coal feeding was set up, in which high volatile bituminous coals pyrolysis by solid heat carrier was carried out. Two modifications were made in the new process. One modification is that the baffle mixing is use...

The CO 2-char gasification of Shenmu coal char (CC), Rice straw char (RSC), Sorghum stalk char (SSC) and Pine sawdust char (PSC) and the blend of coal char and biomass char was studied by means of isothermal thermogravimetric analysis (TGA). The results showed that the order of reaction activity of various chars was as following: PSC>SSC>RSC>SMC. T...

Multiphase computational fluid dynamics (CFD) has become an alternative method to experimental investigation for predicting the fluid dynamics in gas–solid fluidized beds. The model of Brandani and Zhang, which contains additional terms in both the gas- and solid-phase momentum equations, is employed to explore homogeneous fluidization of Geldart t...

A one-dimensional, steady state, numerical model for coal pyrolysis by solid heat carrier in moving-bed has been developed. The multiple-reaction model of coal pyrolysis and the gas–solid–solid three phases heat transfer theory in packed bed have been applied to account for the pyrolysis process. The results show that the axial temperature distribu...

Conversion of coal-tar pitch in supercritical water (SCW) was researched using a batch reactor. The effects of temperature (400°C–480°C), pressure (25 MPa–40 MPa), and residence time (1 min–80 min) on product composition were investigated. When compared with pyrolysis under N2 atmosphere, the conversion of asphaltene to maltene was enhanced, wherea...