In this study, the effects of particle size distribution （PSD）, chemical composition and pore structure of petroleum coke on the slurryability of petroleum coke water slurry （PCWS） were investigated. Four petroleu...In this study, the effects of particle size distribution （PSD）, chemical composition and pore structure of petroleum coke on the slurryability of petroleum coke water slurry （PCWS） were investigated. Four petroleum cokes were studied, and they showed completely different slurryability. The solid concentration at fixed viscosity （i.e. apparent viscosity of 1000 mPa） （SCFV） of four PCWSs is different from each other, with the highest value of 70.9%, and lowest of 62.1%. The apparent viscosity of the four PCWSs all increased with an increase of the solid concentration. The results showed that the PSD, inherent moisture content, specific surface area and pore volume of petroleum coke were key factors to affect the slurryability. The slurryability was enhanced with increasing PSD range and particle packing fraction, and with decreasing inherent moisture content, specific surface area and pore volume.展开更多
Wetting Heat of various ranks of coals in water was measured by using SETARAM C80D Calorimeter. The data were correlated to coals' slurryability which is characterized by the solid load at the viscosity of 1 Pa...Wetting Heat of various ranks of coals in water was measured by using SETARAM C80D Calorimeter. The data were correlated to coals' slurryability which is characterized by the solid load at the viscosity of 1 Pa's and 25℃. The results showed that the heat of wetting by wa-ter decreases as coal rank increases in the range of brawn coal to bituminous coaI with carbon content of 89% ~90% (daf), and then, increases a little for anthracite. This trend fitted well to the relationship of slurryability to coal rank. The heat of wetting was also correlated to the inher-ent moisture content and the oxygen content of coal, which are commonly considered as slurrya-bility indication parameters. Hence, the wetting heat is another measure of coal's slurryability.展开更多
To improve slurryability,high power ultrasonic energy was used to treat coal slurry. The influence of power on the slurryability of raw coals and on the maximum hydro-content (MHC) was investigated by measuring the ap...To improve slurryability,high power ultrasonic energy was used to treat coal slurry. The influence of power on the slurryability of raw coals and on the maximum hydro-content (MHC) was investigated by measuring the apparent viscosity before and after treatment. The experimental results show that the effect of treatment on sluryability is different for different rank coals under the same treatment conditions. The coals metamorphosed to lower degree are more sensitive to the ultrasonic treatment. The apparent viscosity of slurries from coal metamorphosed to medium degree clearly decreases after the ultrasonic treatment. The ultrasonic treatment makes MHC decrease,which improves the slurryability. For Shenmu or Hebi coal slurry after 3 min. treatment the maximum fixed-viscosity concentration is increased by about 0.4% and 0.3%,respectively,when the ultrasonic power is 100 W. The maximum fixed-viscosity concentration increased 2.4% and 1.7%,respectively,when the ultrasonic power was 300 W,but it decreased by about 0.4% and 0.7%,respectively,when the power was 500 W.展开更多
Three coal samples of different ranks were used to study the effect of coal blending on the preparation of Coal Water Slurry (CWS). The results show that by taking advantage of two kinds of coal, the coal concentratio...Three coal samples of different ranks were used to study the effect of coal blending on the preparation of Coal Water Slurry (CWS). The results show that by taking advantage of two kinds of coal, the coal concentration in slurry made from hard-to-pulp coal can be effectively improved and increased by 3%–5% generally. DLT coal (DaLiuTa coal mine) is very poor in slurryability and the stability and rheology of the resulting slurry are not very good. When the amount of easily slurried coal is more than 30%, all properties of the CWS improve and the CWS meets the requirements for use as fuel. Coalification, porosity, surface oxygenic functional groups, zeta potential and grindability have a great effect on the performance of blended coal CWS. This leads to some differences in performance between the slurry made from a single coal and slurry made from blended coal.展开更多
基金the financial support from National Key Basic Research Program Project (No. 2010CB227001)
文摘In this study, the effects of particle size distribution （PSD）, chemical composition and pore structure of petroleum coke on the slurryability of petroleum coke water slurry （PCWS） were investigated. Four petroleum cokes were studied, and they showed completely different slurryability. The solid concentration at fixed viscosity （i.e. apparent viscosity of 1000 mPa） （SCFV） of four PCWSs is different from each other, with the highest value of 70.9%, and lowest of 62.1%. The apparent viscosity of the four PCWSs all increased with an increase of the solid concentration. The results showed that the PSD, inherent moisture content, specific surface area and pore volume of petroleum coke were key factors to affect the slurryability. The slurryability was enhanced with increasing PSD range and particle packing fraction, and with decreasing inherent moisture content, specific surface area and pore volume.
文摘Wetting Heat of various ranks of coals in water was measured by using SETARAM C80D Calorimeter. The data were correlated to coals' slurryability which is characterized by the solid load at the viscosity of 1 Pa's and 25℃. The results showed that the heat of wetting by wa-ter decreases as coal rank increases in the range of brawn coal to bituminous coaI with carbon content of 89% ~90% (daf), and then, increases a little for anthracite. This trend fitted well to the relationship of slurryability to coal rank. The heat of wetting was also correlated to the inher-ent moisture content and the oxygen content of coal, which are commonly considered as slurrya-bility indication parameters. Hence, the wetting heat is another measure of coal's slurryability.
基金Project 50074033 supported by the National Natural Science Foundation of China
文摘To improve slurryability,high power ultrasonic energy was used to treat coal slurry. The influence of power on the slurryability of raw coals and on the maximum hydro-content (MHC) was investigated by measuring the apparent viscosity before and after treatment. The experimental results show that the effect of treatment on sluryability is different for different rank coals under the same treatment conditions. The coals metamorphosed to lower degree are more sensitive to the ultrasonic treatment. The apparent viscosity of slurries from coal metamorphosed to medium degree clearly decreases after the ultrasonic treatment. The ultrasonic treatment makes MHC decrease,which improves the slurryability. For Shenmu or Hebi coal slurry after 3 min. treatment the maximum fixed-viscosity concentration is increased by about 0.4% and 0.3%,respectively,when the ultrasonic power is 100 W. The maximum fixed-viscosity concentration increased 2.4% and 1.7%,respectively,when the ultrasonic power was 300 W,but it decreased by about 0.4% and 0.7%,respectively,when the power was 500 W.
基金Projects 20060290506 supported by the Doctoral Foundation of the Chinese Education Ministry2005B013 by the Science and TechnologyFoundation of China University of Mining & Technology
文摘Three coal samples of different ranks were used to study the effect of coal blending on the preparation of Coal Water Slurry (CWS). The results show that by taking advantage of two kinds of coal, the coal concentration in slurry made from hard-to-pulp coal can be effectively improved and increased by 3%–5% generally. DLT coal (DaLiuTa coal mine) is very poor in slurryability and the stability and rheology of the resulting slurry are not very good. When the amount of easily slurried coal is more than 30%, all properties of the CWS improve and the CWS meets the requirements for use as fuel. Coalification, porosity, surface oxygenic functional groups, zeta potential and grindability have a great effect on the performance of blended coal CWS. This leads to some differences in performance between the slurry made from a single coal and slurry made from blended coal.
