Effect of fuel particle and droplet size distribution on particle size distribution of char and ash during pilot-scale combustion of pulverized coal and coal-water slurry fuels

1993 ◽  
Vol 7 (4) ◽  
pp. 520-531 ◽  
Author(s):  
Sharon Falcone Miller ◽  
Harold H. Schobert
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Droplet Size ◽  
Droplet Size Distribution ◽  
Pilot Scale ◽  
Pulverized Coal ◽  
Fuel Particle ◽  
Water Slurry ◽  
Coal Water Slurry

Effect of Particle Size Distribution and Selective Alcohol Additives for Preparation of High Concentration Coal-Water Slurry

2020 ◽  
Vol 12 (2) ◽  
pp. 102-111 ◽  
Author(s):  
Debadutta Das ◽  
Anupama Routray ◽  
Swetashree Pattanaik ◽  
Pankaj K. Parhi ◽  
Bijnyan R. Das ◽  
...  
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Static Stability ◽  
Industrial Applications ◽  
High Concentration ◽  
Oh Groups ◽  
Water Slurry ◽  
Coal Water Slurry ◽  
Water Alcohol

Background: The alternative of oil is highly essential in the present context due to the acute shortage of oil as well as increasing demand for it from different public and private sectors. Since 1980, attention has been focused on coal-water slurry as an alternative fuel for the power generation industry and a suitable substitute for oil in several industrial applications. One of the exciting areas in Coal Water Slurry (CWS) is coal–water-alcohol slurry in which different alcohol compound can act as a dispersant for the stabilisation of coal–water slurry. Objective: The objective of this paper is to prepare a high concentration coal–water-alcohol slurry using glycerol, glycol and ethanol as an additive, and different particle size distribution of coal. This will increase the surface activity of the coal thereby, decreasing the viscosity of the slurry. Method: Two bimodal samples are prepared in which coarse particles are (212 μm - 300 μm), (150 μm – 212 μm) and fine particle below 75 μm. Three types of alcohol additive namely glycerol, glycol and ethanol are used as a dispersant. Malvern Particle size analyzer is used to measure the particle size distribution of the coal samples. Rheological study of CWAS was conducted using HAAKE RHEO STRESS 1. Result: From the experiment, it has been concluded that the optimum addition of glycerol in water is taken as 90:10 of water and glycerol ratio because after that, there is no further decrease in the value of viscosity. An optimum value of glycol and ethanol mixed in water was determined and found as in the ratio of 86:14 and 82:18, respectively. Conclusion: From different parameter studies like coal concentration, pH, temperature, apparent viscosity and stability, it has been concluded that coal-water-glycerol slurry is better than other coal water- alcohol slurry. This is because of the presence of more OH- groups in glycerol. The static stability of this coal-water-alcohol slurry exists for the maximum period of 31 days.

Slurryability and flowability of coal water slurry: Effect of particle size distribution

2021 ◽  
Vol 323 ◽  
pp. 129183
Author(s):  
Harmanpreet Singh ◽  
Satish Kumar ◽  
Saroj Kumar Mohapatra ◽  
Shashi Bhushan Prasad ◽  
Jatinder Singh
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Water Slurry ◽  
Coal Water Slurry ◽  
Effect Of Particle Size

scholarly journals Droplet size distribution measurement of water in kerosene by the buoyancy weighing-bar method

2018 ◽  
Vol 154 ◽  
pp. 01016 ◽  
Author(s):  
Rondang Tambun ◽  
Piety Sibagariang ◽  
Brigitta Alphantaria ◽  
Ahmad Mulia Rambe
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Droplet Size ◽  
Droplet Size Distribution ◽  
Coulter Counter ◽  
Particle Migration ◽  
Distribution Measurement ◽  
Counter Method ◽  
Separation Time

The buoyancy weighing-bar method (BWM) is a method that requires a simple apparatus set up yet produce the high accuracy result in particle size distribution measurement both settling and floating particles. The principle of this experiment that measurement the density change in a suspension due to particle migration is measured by weighing buoyancy against a weighing bar hung in the suspension, and the particle size distribution is calculated using the length of the weighing bar and the time–course change in the apparent mass of the weighing bar. In this study, the BWM was applied to determine the separation time and droplet size distribution for liquid-liquid systems with the different density. The mixture of 99 % of kerosene and 1 % of water were used as samples. The data obtained of separation time of water-kerosene mixture by the BWM were analyzed by the gas chromatography, and the droplet size distributions were compared to Coulter counter method. Based on the data obtained, the BWM could be used to determine the optimal time of waterkerosene separation. The BWM also could measure the droplet size distribution of water in kerosene and the data obtained were comparable to that measured by Coulter counter method. Hence, the BWM is a novel method in separation time determination of water-kerosene mixture and droplet size distribution measurement of water in kerosene.

scholarly journals A new method for evaluating packing efficiency of particle size distribution during coal water slurry preparation

2020 ◽  
Author(s):  
Heping Li ◽  
Xiaoyan Chen ◽  
Wanyi Liu ◽  
Zhiqiang Wu ◽  
Gang Wang
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Evaluation Method ◽  
Particle Packing ◽  
Experimental Investigations ◽  
Wet Milling ◽  
Water Slurry ◽  
Coal Water Slurry ◽  
Packing Efficiency

Abstract Particle size distribution is a key problem in preparation of coal water slurry . Due to the large number of particles and irregular accumulation of particles, how to evaluate and calculate CWS particles has become an urgent need. In this paper, the volume accumulation of particles is simplified as plane accumulation, and the particle packing gradation model based on the three-particle packing gradation and the four-particle packing gradation is constructed. Based on the classical mathematical principle, the packing voids and packing probability of 5 typical CWS particle sizes were calculated. The packing styles of N 1 N 2 N 3 , N 2 N 3 N 4 and N 3 N 4 N 5 were evaluated and analyzed. The evaluation method of packing index based on ΣP×S min andΣP×S max was established. The results show that the packing efficiency of particles can be quantitatively evaluated by using of cumulative calculation of voids areas and packing probabilities under different packing modes. The evaluation results are consistent to the tendency of CWS concentration. By this method, the particle size distribution of CWS can be controlled and adjusted during both wet milling processes and experimental investigations. Furthermore, the method may be used to other particle packing cases.

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