Effect Of Coal Particles Research Articles

Effects of Coal Particles on Microbubble-Enhanced Bitumen Separation in the Concentrated Slurry Flow of Oil Sands Tailings

Effects of Coal Particles on Microbubble-Enhanced Bitumen Separation in the Concentrated Slurry Flow of Oil Sands Tailings

Effect of Coal Particles on Embryonic Development, Egg Hatching Rate and Larvae Survival Rate of Climbing Perch Fish Anabas testudineus BLOCH

This study aimed to analyze the impact of coal particles on the embryo development, egg hatching rateand larvae survival rate of climbing perch fish Anabas testudineus Bloch. The research was done in the wetlaboratory of the Faculty of Fisheries and Marine, Lambung Mangkurat University for six months. Thetreatment in this study was a dose of coal particles exposure to eggs and larvae. The coal particles measuring150 ?m can penetrate the eggshell and interfere with embryo development at the stage of organ formation(organogenesis) and larval development. The eggs were exposed to coal particles 15 mg/litre of water. Itturns hatching rate was 87% lower than without exposure to 98%. Similarly, the larvae survival rate (up today 4) were exposed to coal dust 80% and without exposure to 93%.

Puffing/micro-explosion in rapeseed oil/water droplets: The effects of coal micro-particles in water

The paper is focused on detailed experimental investigation of puffing and micro-explosions in composite water/rapeseed oil droplets in the presence of lignite and bituminous coal micro-particles in water. Gas temperature was measured using a high speed National Instruments 9219 for data collection and an S-type thermocouple. Video recording of droplet micro-explosions was performed using a Phantom Miro M310 high-speed camera. Droplets with radii in the range 1–2 mm were placed in a hot chamber with air velocities 3–7 m/s and temperatures up to 600 °C. The time to puffing/micro-explosion and average radii of child droplets generated during puffing and micro-explosions are shown to decrease with increasing gas temperature. The presence of bituminous coal led to a visible decrease in these radii. The observed times to puffing/micro-explosion were interpreted in terms of the recently developed model of the phenomenon based on the assumption that a single spherical water sub-droplet is located in the centre of a spherical fuel droplet. The time to puffing/micro-explosion in this model is associated with the time instant when the temperature at the water/fuel interface reaches the water nucleation temperature. The model predicts a decrease in time to puffing/micro-explosion in agreement with experimental observations. The effect of coal particles on this time is shown to be weak in agreement with observations at gas temperatures above 300 °C. It is shown that the times to puffing predicted by the model are close to those predicted by a simpler model in which these times are identified with the time instants when the temperature at the water/fuel interface reaches the boiling temperature of water.

Effect of coal dust on the air-methane mixture combustion in the Swiss-roll burner

The 2-D numerical model has been developed to simulate the combustion of lean coal-methane-air mixture in ?Swiss-roll? burner and investigate the effect of coal particles content and mixture feed rate on the stable burner operation. Five homogeneous and three heterogeneous chemical reactions are considered. The Eulerian model for gas phase and the discrete particle model (Lagrangian) for particle phase taking into account the radiation are used in this study. Simulations are performed for the two turns ?Swiss roll? burner with heat insulated outer wall, channel width of 6 mm and inner wall thickness of 2 mm. It is shown that the presence of coal particles in a lean methane-air mixture expands the range of stable operation of the "Swiss-roll" burner. It is found that an increase in the content of coal particles reduces the combustion time of the particles by in-creasing the combustion temperature, changes the shape of the reaction zone, and shifts it to the burner inlet.

The Technical Analysis on Upgrade and Coupling of Low-Quality Coal

Experimental study was conducted with regard to upgrading low-quality coal by low temperature pyrolysis technology and fluidization classification technology, which laid the theoretical foundation for research and development of low-quality coal upgrading process. Firstly, a pyrolysis pilot experiment of long-flame coal was performed and the optimum pyrolysis conditions were found. When the final pyrolysis temperature was 450?C and the residence time was 10 minutes, the content of semicoke volatile dry ash-free was about 22.89% and the content of semicoke ash was about 16.1%. More than 5% of the ash needs to be removed before entering the pyrolysis fluidized bed. Thus, classification tests were carried out to pick out the coal particles with the target size of 500 μm, using a gas-solid fluidized bed coal picker. It was found that the separating effect of coal particles was the most satisfactory when the inlet velocity at the bottom was 3.27 m/s. The percentage of particles with diameters less than 500 μm was as low as 28.7% in the coarse samples. Based on the test results, a novel process of low-quality coal upgrade and coupling was proposed, which realized the sorting, grading, drying and pyrolysis of low-quality coal through the multi-stage fluidized bed integrated process.