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Three powdery CaO-based sorbents were synthesized respectively from calcium acetate and three different inert support precursors. Based on these sorbent powder, sorbent pellets without and with pore forming material (cellulose) were fabricated using an extrusion-spheronization method. Cyclic CO2 sorption performance of all powdery sorbents and sorbent pellets were tested in a TGA. It was found that...
The combination of the advanced ultra-supercritical (AUSC) and oxy-fuel combustion technologies is considered the most feasible and promising choice for carbon capture and storage. The high efficiency of AUSC boilers compensates for the cost incurred in controlling CO2 emissions. In this study, a new improved model was proposed for gas-radiative properties as a polynomial function of the continuous...
Determining gas diffusion coefficient from experimental data is a key step of reproducing and predicting the diffusion process in coal. Previously analytical solution, including the unipore diffusion model and the bidisperse diffusion model, has been used extensively to estimate the gas diffusion coefficient(s) in coal. The utilization of analytical solution is convenient, however, there are some...
Self-heating or even spontaneous combustion of stockpiled coal, which is likely to outbreak under favourable circumstances during its transport, process, and storage, is a long-standing thermal dynamic hazard. This hazard is harmful in diverse aspects: causing loss of coal resource and caking property, raising safety concerns upon occurrence of open fire, and giving off noxious/greenhouse effect gases...
The objective of this work is to investigate the influence of waste cooking oil biodiesel on oxidation reactivity and nanostructure of particulate matter (PM). The test was carried out in a small agricultural diesel engine. PM samples were collected by MOUDI and subjected to TGA, Raman, NEXAFS and TEM. According to TGA, when waste cooking oil biodiesel quantity increases in the fuel, PM shows a higher...
This paper aims to clarify ash deposition/slagging behavior of the newly found Xinjiang high-alkali coal in China, which is notorious for large amounts of sodium (Na2O, 4.0–10wt%) and calcium (CaO, 20–40wt%). A 12-h exposure test of ash deposition/slagging was conducted in a 3MWth pilot plant, with a number of deposition probes and heat transfer tubes being inserted along the furnace to mimic the...
The study aims to understand the fundamental mechanism of the pyrolysis of polyvinylchloride (PVC) by investigating the chars produced in a wire-mesh reactor, where the interactions of evolving volatiles and pyrolysing PVC particles as well as the secondary reactions of the volatiles are minimized. The initiation of PVC pyrolysis can start at a temperature as low as 200°C on the surface of PVC particles...
This paper presents the first trial in the world for experimental and modeling investigation of oxy-fuel combustion of Victorian brown coal in a 3MW th pilot-scale facility. Two coal samples with different moisture contents, wet (40wt% moisture) and air-dried (24wt% moisture), were tested in air- and oxy-firing modes with oxygen level varying from 27% (vol) to 40% in furnace. The commercial...
Numerical analysis is performed to investigate the influences of gas temperature fluctuation on soot formation and oxidation. The gas flow has a time-averaged gas temperature of 1400–1700K. The instantaneous variations of soot volume fraction with time are obtained under different conditions. Obvious differences are found between the results with and without the gas temperature fluctuation. The time-averaged...
The effects of gas temperature fluctuation on the NO release from pulverized coal particle during char combustion are investigated. The computed results show that the NO formation through the heterogeneous oxidation and reduction reactions is influenced by the gas temperature fluctuation for the particles with initial diameters of 10–50μm. The gas temperature fluctuation leads to faster NO release...
A particle stochastic trajectory model for turbulence-particle reaction interactions is proposed and formulated in the present paper. This model provides the basis for a comprehensive model of pulverized coal combustion. It is applied to the simulation of gas-particle turbulent flow and combustion in a pulverized coal-fired swirl combustor. The results are compared with the measured test data and...
The heterogeneous char reaction processes of pulverized coal particle in a hot gas flow with temperature fluctuation are investigated. The instantaneous mass variations and char reaction rates of the particles with initial diameters of 10–50μm are calculated under different conditions. The gas temperature fluctuation has evident influences on the instantaneous char reaction processes of the pulverized...
The coal fly ash from a Chinese thermal power plant was vitrified after the addition of ∼10wt% Na 2 O. The glass products have suitable viscosity at 1200°C and displayed a good chemical durability. The heavy metals of Pb, Zn, Cr and Mn were successfully immobilized into the glass as determined by the toxicity characteristic leaching procedure method. Results indicate an interesting potential...
This paper presents a numerical simulation of particle motion and combustion in a pulverized coal-fired sudden-expansion combustor with coaxial jets. The computations are conducted for both bituminous and lean coal flames. The obtained results show the trajectories and the mass and temperature variations with time for coal particles of different initial sizes. It is seen that the interactions between...
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