Low-temperature pyrolysis offers a potential way of upgrading lignite and producing chars to replace thermal or pulverized coal injection (PCI) coals in combustion being used as inert components blend for coking. In this study, the characteristics from low-temperature two have been investigated. The changes char morphology chemical structures were investigated using scanning electron microscopy (SEM) Fourier transform infrared spectroscopy (FTIR). reactivity was analyzed thermogravimetric...

Combustion of coal gangue is extensively used for power generation in China. In this paper, pyrolysis and combustion characteristics a low-rank have been investigated under oxy-fuel (O2/CO2) air (N2/O2) conditions using drop tube furnace thermogravimetric analysis. Pyrolysis experiments were carried out N2 CO2 environments, which are the main diluting gases respectively. The burnout yields volatile matter analyzed during DTF experiments. At lower temperatures, weight loss rate was higher...

4-Acetoxy-azacyclobutanone (4AA) is a highly demanded chemical compound used in the production of Penem and Carbapenem antibiotics. However, its synthesis constrained by preparation methyl (2S,3R)-2-[(benzoylamino)methyl]-3-hydroxybutanoate [(2S,3R)-BHME]. In light stringent environmental regulations, there an urgent need to develop effective enzymatic method using 2-benzoylaminomethyl-3-oxy-butyrate ester (BOME) as substrate. This study mined carbonyl reductase AxSDR from Algoriella...

The oxidation characteristics of chars from low-temperature pyrolysis two lignite coals have been systematically investigated using a dual fixed-bed quartz reactor and thermogravimetric analyzer (TGA). During experiments, the temperature profiles coal char samples were recorded CO2 CO gases evolved analyzed gas chromatography. physical chemical structures Brunauer–Emmett–Teller (BET) adsorption isotherms Fourier transform infrared spectroscopy (FTIR). oxidation, sample may increase...

Low-temperature co-pyrolysis of lignite coal and biomass blends was studied at different ratios using a fixed bed reactor thermogravimetric analyzer (TGA). The results show that the addition during low-temperature pyrolysis found to promote collapse macro-pores, leading formation more fine meso-pores in chars. As stabilizer hydrogen atoms produced from samples reacted with radical fragments which inhibited polymerization, resulted an increase tar gases yields. effect on chemical structure...

β-Sialon based composites were produced using a vertical reactor by carbothermal reduction reaction under nitrogen fly ash and lignite chars to examine the effects of mixing, carbon content, temperature sintering time. The influences as reductant further investigated in comparison with graphite. evolution phase morphology samples analyzed X-ray diffraction (XRD) scanning electron microscope (SEM). Mechanical stirring was favored mix chars, while ball-milling shove porous structure due...

Sewage sludge contains a very high ash content, which makes it unsuitable for chemical looping hydrogen generation (CLHG). The features of CLHG were investigated in fixed bed reactor using sewage (S) and corncob (B) as fuel. wet impregnation method was adopted to prepare the CuO-Fe2O3 oxygen carrier (OC). It found that when S B mixed at ratio 2:1, H2 production could be increased from 0.8 12 mL. When C/O S/B S/Cb (corncob char) OC equal, had higher reduction depth carbon fuel primarily...

The main problem of coal direct chemical looping hydrogen generation (CLHG) is that ash and oxygen carrier (OC) cannot be effectively separated, which makes the OC activity reduced after multiple cycles. In this study, a double plate-fixed bed reactor adopted. gasification reduction reaction were integrated in same furnace, production characteristics ZhunDong by studied. Cu-Fe composite was prepared synthesis method. results show higher copper oxide content smaller particle size, better...

Abstract The high moisture and low calorific value of Zhundong lignite restricts its long-distance transportation large-scale application. In this paper, the elemental composition changes combustion characteristics upgraded were studied, then reaction kinetics was analyzed by Flynn-Wall-Ozawa (FWO) method. results show that with increase upgrading temperature, content volatiles water in coal decrease, which leads to an proportion carbon, nitrogen sulfur, a decrease hydrogen oxygen....

Biomass gasification is a kind of environmentally friendly technology for new energy utilization. The tar from biomass the key factor which restricts development technology. experiment has been carried out on cracking characteristics at temperatures 700-1000°C, and notion gas production rate was put forward. result showed that can be an effective supplement producer gasification, along with raising pyrolysis temperature, yield increasing, trend gradually more obvious.

The dithioacetal mono-oxides are useful compounds to control the stereochemistry in reactions of carbonyl compounds. Therefore, an effective method synthesize these is still desirable. authors achieved vanadium-catalyzed asymmetric oxidation 1,3-dithianes afford corresponding sulfoxides good yield with high enantioselectivity.

The actual coking engineering challenge is changed into a numerical simulation calculation problem due to the difficulty in monitoring parameters of heat recovery coke furnace. release law coal volatiles calculated using chemical percolation devolatilization (CPD) model this study. To explore distribution properties temperature field and flow furnace as well burning condition surface cake, user-defined function (UDF) coupled with porous medium model, transient carried out. accuracy verified...

Abstract In this paper, the combustion characteristics of lignite with different levels predrying and influence oxy-fuel concentration on pulverized coal are studied CFD software. The results show that increase moisture content, temperature level in burner decreases gradually, which affects ignition thermal efficiency furnace, amount NO intermediate products furnace also decreases. flame distance is shortened rate accelerated. production SO 2 reduced, CO can reach more than 90%. local high...