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Investigations of natural gas hydrate dissociation from a slurry to a water-in-oil emulsion are conducted in a high-pressure hydrate experimental flow loop equipped with on-line microcosmic instruments including a focused beam reflectance measurement (FBRM) probe and a particle video microscope (PVM) probe. Three stages of the dissociation processes are observed and sketched in a conceptual mechanistic...
In this work, single particle combustion of raw and torrefied 4mm wood particles with different potassium content obtained by KCl impregnation and washing was studied experimentally under a condition of 1225°C, 3.1% O2 and 26.1% H2O. The ignition time and devolatilization time depended almost linearly on the fuel particle mass. The char conversion time was influenced by both the char mass and char...
The formation of CH3Cl and the transformation of chlorine and potassium during pyrolysis of biomass were investigated. Model biomass compounds (cellulose, xylan, lignin and pectin) and pine wood doped with KCl were pyrolysed in a TGA at different heating rates (10–1000°C/min), temperatures (300–850°C), and KCl contents (0–5wt%). The volatiles were collected and analyzed for CH3Cl concentration by...
The utilization of low-dimensional manifold combustion models for large-eddy simulation (LES) of turbulent reactive flows introduces model simplifications that represent sources of uncertainties in addition to those arising from turbulent closure models and numerical discretization. The ability to quantitatively assess these uncertainties in the absence of measurements or reference results is vital...
The viscosity of natural gas hydrates slurry in high-pressure hydrates slurry rheological measurement system is investigated, which is meaningful for hydrates risk management to solve flow assurance issues in deep-water offshore field. Based on an appropriate stirring speed and time, a relatively uniform and stable hydrates slurry were formed from a water-in-oil emulsion to study the hydrates formation...
Using the theory of heterogeneous nucleation, a novel process is proposed to enhance the removal performance of fine particles from desulfurized flue gas. The necessary supersaturated atmosphere is established by adding humid air into the growth region, located at the top of the desulfurization scrubber. The size of fine particles would be enlarged by heterogeneous condensation and then the condensation-grown...
During biomass and waste combustion, high levels of alkali halides in the flue gas often lead to increased deposit formation and accelerated superheater corrosion. These problems can be reduced either by co-combustion or by the use of sulfur-containing additives. A measurement campaign was carried out in a 20kWth bubbling fluidized bed (BFB) bench-scale reactor to characterize the sulfation behaviors...
The organic–inorganic hybrid catalysts, namely [GlyH]xH3−xPW12O40 (x=1.0–3.0), prepared by mixing varied amounts of glycine (Gly) and tungstophosphoric acid (TPA), were characterized by different analytical and spectroscopic techniques such as TGA, XRD, FT-IR, and 1H and 13C NMR. In particular, their acidic properties were probed by solid-state 31P MAS NMR of adsorbed trimethylphosphine oxide. The...
Mesoporous silica MCM-41 supported Ni-based catalysts were prepared by glucose (Glu) and β-cyclodextrin (βCD) modified impregnation method, respectively. The physicochemical properties of the catalysts (Ni/MCM-41-βCD and Ni/MCM-41-Glu) were characterized with BET, XRD, H2-TPR and TEM techniques, and their catalytic performance in CO2 reforming of methane to syngas was evaluated. The results revealed...
In solid substances used as fuels, bromine originates mainly from flame retarded plastics and textiles, as well as from wastewater sludge. It has been indicated that bromine behaves in a similar way as chlorine with respect to ash forming matter, aerosol formation and high temperature corrosion in biomass and waste fired boilers. In this work, a measurement campaign was carried out in a 20kW th...
Ash transformation and deposition during pulverized wood combustion in a full-scale power plant boiler of 800MW th were studied with and without the addition of coal fly ash. The transient ash deposition behavior was characterized by using an advanced deposit probe system at two boiler locations with flue gas temperatures of about 1300°C and 800°C, respectively. The mechanisms of ash transformation...
Co-combustion of a bituminous coal and a solid recovered fuel (SRF) was carried out in an entrained flow reactor, and the influence of additives such as NaCl, PVC, ammonium sulphate, and kaolinite on co-combustion was investigated. The co-combustion experiments were carried out with SRF shares of 7.9wt.%, 14.8wt.% and 25wt.%, respectively. The effect of additives was evaluated by maintaining the share...
In order to utilize the solid residues simultaneously with clean and high-combustion efficiency when firing high sulfur and ash coal sludge generated in coal washing process in China, the mineral composition and usability of combustion solid products were investigated when injecting compound additives into series of coals or coals blended with sludges. In this study, a single burner furnace was used...
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