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Wang Fu-chen - One of the best experts on this subject based on the ideXlab platform.

  • Co-gasification of Petroleum Coke and straw char
    Journal of Fuel Chemistry and Technology, 2012
    Co-Authors: Wang Fu-chen
    Abstract:

    A thermogravimetric apparatus(TGA)was used to investigate the CO2-char gasification characteristics of Petroleum Coke,straw char,and the mixture using isothermal mode at the temperature ranging from 900 ℃ to 1 050 ℃.The rate of co-gasification increases with an increase of straw addition ratio.The results show that the order of reactivity of various prepared chars is as follows:straw chardeashing straw charthe mixture of Petroleum Coke and straw the mixture of Petroleum Coke and straw charthe mixture of Petroleum Coke and deashing strawthe mixture of Petroleum Coke and deashing straw CokePetroleum Coke.The co-gasification rate of the mixture of Petroleum Coke and straw char is higher than the rate sum of single Petroleum Coke and single straw,suggesting that there is a synergistic effect due to the co-gasification.

  • Steam gasification reactivity of Petroleum Coke by microwave treatment
    Journal of Fuel Chemistry and Technology, 2012
    Co-Authors: Wang Fu-chen
    Abstract:

    The gasification kinetic characteristics of Petroleum Coke treated in micromave was studied at 1 000~1 150 ℃ with a water vapor fraction range of 30%~100% by using a thermogravimetric analyzer,and the experimental data was fitted with four kinetic models.The results show that the gasification rate of Petroleum Coke treated in microwave increases with the decrease of microwave irradiation time,power and temperature.At 1 100 ℃,the steam gasification rate of Petroleum Coke-treated increases with Coke conversion initially,and then decreases after reaching a maximum value when the Coke conversion is about 20%,which does not change with the microwave treatment conditions and the water vapor fraction.However,the maximum rate occurs earlier with the increase of gasification temperature.The steam gasification reaction rate of Petroleum Coke by microwave treatment at different temperatures can be well fitted with the normal distribution function model,which has the correlation coefficients above 0.97.

  • Effect of Microwave Activation on the Characteristics of Petroleum Coke Gasification
    2011
    Co-Authors: Wang Fu-chen
    Abstract:

    At atmospheric pressure,gasification of Petroleum Coke was carried out in WRT-3P thermogravimetric analysis system at 1200℃.The effects of microwave irradiation time,power and temperature on the gasification reactivity of Petroleum Coke were investigated by using X-ray diffraction(XRD),infrared absorption spectrum(IR) and accelerated surface area and porosimetry system(ASAP).The results indicated that the gasification rate of microwave-treated Coke increased with the increase of the Coke conversion and then decreased after reaching its maximum at the conversion of 0.1.The gasification rate of Petroleum Coke increased and the microcrystallite structure of Petroleum Coke became amorphous with the increase of microwave irradiation time and irradiation power.However,as the irradiation temperature increased,the gasification rate of microwave-treated Coke increased and then decreased,showing the crystalline ordering degree of Petroleum Coke weakened first and then strengthened.

  • Effect of coal slag on stability of Petroleum Coke water slurry
    2010
    Co-Authors: Wang Fu-chen
    Abstract:

    Coal slag was added in Petroleum Coke water slurry to investigate its effect on the stability of the slurry.It shows that the coal slag can significantly improve the stability of the slurry and increase the yield stress.The slurry prepared can meet the requirement of industry when the solid mass fraction is 63% and the slag mass is 20%-25% of the total solid mass.The highest solid mass fraction of Petroleum Coke 1 water slurry is 70% when adding the slag mass fraction of 15%,and that of Petroleum Coke 2 is 67% when adding the slag mass fraction of 20%.The proper quantities of coal slag can be used as effective stabilizer for preparing Petroleum Coke water slurry with higher solid mass fraction.

  • EFFECT OF BLACK LIQUOR ON THE SLURRY PROPERTIES OF Petroleum Coke-WATER
    2009
    Co-Authors: Wang Fu-chen
    Abstract:

    With continuous increase of heavy crude in worldwide supply,the output of Petroleum Coke is steadily increasing.How to dispose the abundant Petroleum Coke,especially those with high sulfur content has been an urgent problem.Gasification technology with near-zero pollution emissions will be a new way to utilize Petroleum Coke.So it is important to study and improve the slurry ability of Petroleum Coke because the slurry of Petroleum Coke is the first and crucial step of gasification.The effect of black liquor on the slurry properties of Petroleum Coke-water was investigated with results showing that when Petroleum Coke was 65%,Petroleum Coke-water could not be made to slurry.Petroleum Coke-water slurry could be finely reformed by black liquor in great extent.The viscosity of Petroleum Coke-water slurry decreased with the content of black liquor first,then increased after reaching its maximum value of 520 mPa·s under 100 s-1shear rate.The optimum loading content of black liquor was 1% mass fraction of Petroleum Coke with the highest Petroleum Coke mass fraction of 70% in Coke-water system.The deposition did not occur in the Petroleum Coke-water slurry within 2 d with the content of black liquor ranged from 0.6% to 10% of Petroleum Coke which was 65% mass fraction in Coke-water system,fitting for the industry application.

Cao Xinyu - One of the best experts on this subject based on the ideXlab platform.

  • Study on rheological characteristics of Petroleum Coke residual oil slurry
    1997
    Co-Authors: Shou Weiyi, Xu Xiaoming, Cao Xinyu
    Abstract:

    We have embarked on a program to develop Petroleum Coke residual oil slurry (POS) as an alternative fuel for existing oil-fired boilers. The industrial application of Petroleum Coke residual oil slurry requires full knowledge of its flow behavior. This paper will present the results of an experimental investigation undertaken to study the Theological properties using a rotating viscometer at shear rate up to 996 s{sup -1}. The effects of temperature, concentration, particle size distribution and additives are also investigated. The experiments show that Petroleum Coke residual oil slurry exhibits pseudoplastic behavior, which has favorable viscosity property under a certain condition and has broad prospect to be applied on oil-fired boilers.

  • Study on combustion characteristics of Petroleum Coke residual oil slurry
    1997
    Co-Authors: Shou Weiyi, Xu Xiaoming, Cao Xinyu
    Abstract:

    Petroleum Coke residual oil slurry (POS) is one of prospect substitute of oil burned in many industrial boilers and utilities in China. It is a mixture of pulverized Petroleum Coke, residual oil and slurry oil. We carried out a series of experiments to study its ignition and combustion mechanism. Experimental results show that the ignition temperature of Petroleum Coke is higher than normal anthracite and meager coal, and it is difficult to be burned in oil-fired furnace directly. The Petroleum Coke`s combustion property is improved greatly after mixing with residual oil and slurry oil. The combustion process of POS can be divided into three phases: preheating, kindling and homogenous combustion, burning of the Petroleum Coke residue. The combustion condition of POS is close to bituminous and coal-oil-mixture (COM).

Fuchen Wang - One of the best experts on this subject based on the ideXlab platform.

  • Effect of heat treatment on structure and gasification reactivity of Petroleum Coke
    International Journal of Coal Science & Technology, 2016
    Co-Authors: Li Chao, Zhijie Zhou, Xin Liu, Zhenghua Dai, Ji Yang, Fuchen Wang
    Abstract:

    Petroleum Coke was thermally treated on a fixed bed reactor in a temperature range of 1173–1673 K. The changes of the elemental composition and crystalline structure of Petroleum Coke, with heat treatments as well as the gasification reactivity of the heat-treated Petroleum Cokes were investigated. The results showed that the Petroleum Coke was carbonized and graphitized to a higher degree with increasing heating temperature, while the gasification reactivity decreased. The treatment at temperatures of 1173 and 1473 K significantly enlarged the specific surface area and the pore volume of Petroleum Coke. Both the specific surface area and the pore volume decreased at 1673 K. An empirical normal distribution function model (NDFM) was found to fit the gasification rates of Petroleum Coke well. The correlation coefficient of Petroleum Coke by normal distribution function model at different heat treatment temperatures is between 0.93 and 0.95.

  • Effect of Microwave Treatment on Structural Changes and Gasification Reactivity of Petroleum Coke
    Industrial & Engineering Chemistry Research, 2011
    Co-Authors: Xin Liu, Zhijie Zhou, Bao-shen Zhang, Lu Chen, Fuchen Wang
    Abstract:

    The gasification reactivity of Petroleum Coke, which was treated by microwave at different times, powers, and temperatures, was investigated by using thermogravimetric analysis (TGA) at 1473 K at atmospheric pressure. The results showed that the gasification rate of Petroleum Coke increased with the increase of conversion and then decreased after reaching its maximum; the conversion corresponding to the maximal gasification rate is about x = 0.1. The gasification rate of Petroleum Coke increased with the increase of microwave irradiation time and irradiation power, but as the irradiation temperature increased, the gasification rate of Petroleum Coke first increased and then decreased. Petroleum Coke before and after microwave treatment was analyzed by X-ray diffraction (XRD), infrared absorption spectroscopy (IR), and the accelerated surface area and porosimetry system (ASAP). The results showed that the crystalline structure of Petroleum Coke becomes amorphous and the BET surface area and pore volume bec...

  • catalytic effect of black liquor on the gasification reactivity of Petroleum Coke
    Applied Energy, 2010
    Co-Authors: Xiuli Zhan, Zhijie Zhou, Fuchen Wang
    Abstract:

    CO2 gasification of Petroleum Coke using black liquor as a catalyst was performed in a thermogravimetric analyzer (TGA) under temperatures 1223-1673 K at ambient pressure to evaluate the effect of black liquor loading on Petroleum Coke gasification. It was found that the gasification reactivity of Petroleum Coke was improved greatly by black liquor. The gasification reactivity was affected by different loading methods in the order: wet grinding > dry grinding > physical impregnation > dry mix. The catalytic activity of black liquor was higher than that of pure alkali metal. The effect of temperature on the gasification reactivity of Petroleum Coke was changed by black liquor. The reactivity reaches its maximum at 1573 K. The reactivity of Petroleum Coke was found higher than that of Shenfu coal when black liquor loading is 5 wt.% (of Petroleum Coke), clearly demonstrating that black liquor could be an effective catalyst for Petroleum Coke gasification.

  • Effect of mechanochemical treatment on Petroleum Coke–CO2 gasification
    Fuel, 2008
    Co-Authors: Jianhui Zou, Zhijie Zhou, Boli Yang, Kaifeng Gong, Fuchen Wang
    Abstract:

    Abstract The effect of mechanochemical treatment during the grinding of Petroleum Coke on its gasification by CO 2 was studied. An additive derived by drying the black liquor in papermaking industry is adopted in grinding process. Results show that the gasification reactivity of Petroleum Coke is effectively improved by grinding, and the activation by wet grinding is more noticeable than that by dry grinding. Besides, by wet grinding Petroleum Coke and additive together, the active metal species in additive are not easily volatilized in gasification, and retain a high catalytic reactivity to the Coke–CO 2 reaction throughout most of the conversion range. Changes in crystal structure of the Petroleum Coke induced by mechanochemical treatment is related to its gasification reactivity. In general, the crystalline–amorphous phase transition is the tendency of long time mechanical grinding, while a crystal structure re-formation stage is observed after wet grinding of Petroleum Coke with and without additive for some time. Similar phenomenon has also been found in the reported data, but not given attention. Some discussion is made in the paper, and more work should be undertaken to disclose the mechanism.

Yu Zun-hong - One of the best experts on this subject based on the ideXlab platform.

  • Slurryability of lignite and Petroleum Coke mixture
    Journal of Fuel Chemistry and Technology, 2008
    Co-Authors: Yu Zun-hong
    Abstract:

    The slurryability of lignite and its mixture with different percent of Petroleum Coke have been investigated.It was found that only 41% of lignite water slurry could be obtained at 1 000 mPa·s due to the strong hydrophility and macroporosity of lignite.With Petroleum Coke,the solid content of lignite water slurry has been progressively improved.The more Petroleum Coke,the higher concentration of mixture slurry.The solid content of slurry is allowed to be 60% when the mass ratio of Petroleum Coke to lignite is 3 to 2.All Coke-lignite-water slurries exhibit pseudo-plastic behavior and good static stability.The hydrophility of lignite is strong,while Petroleum Coke is hydrophobic.The complementarity of lignite and Petroleum Coke plays the key role in getting high mass fraction of Coke-lignite-water slurries.

  • CO-SLURRY ABILITY OF SEWAGE SLUDGE AND Petroleum Coke
    2008
    Co-Authors: Yu Zun-hong
    Abstract:

    The co-slurry ability of the two different kinds of sewage sludge,dewatered sludge and excess sludge,to Petroleum Coke was investigated with naphthalene condensate as dispersant, including solid concentration,rheology and stabilization.Results showed that the concentration of the Petroleum Coke slurry was decreased by the mixture with dewatered sludge or excess sludge,in the same solid mass fraction,co-slurry ability of excess sludge to Petroleum Coke is better than that of dewatered sludge and after modified,the later became better.As increase of shearing rate,both apparent viscosities of dewatered sludge-Petroleum Coke-slurry and excess sludge-Petroleum Coke-slurry fell,so the two sludge-Petroleum Coke-slurries belonged to pseudoplastic fluid.Sludge played the role of stabilizer in sludge-Petroleum Coke-slurry,and the more the sludge addition,the better the stabilization of Petroleum Coke-slurry.

Jing Gu - One of the best experts on this subject based on the ideXlab platform.

  • differences in physical properties and co2 gasification reactivity between coal char and Petroleum Coke
    Process Safety and Environmental Protection, 2009
    Co-Authors: Youqing Wu, Shiyong Wu, Jing Gu
    Abstract:

    Abstract This paper mainly investigated the physical properties and gasification reactivity of coal char and Petroleum Coke, separately at the high temperature pyrolysis (950–1400 °C) with slow heating rate and pyrolysis pressure of the atmospheric pressure and at the pressurized pyrolysis (the atmospheric pressure to 3 MPa) with rapid heating rate and the pyrolysis temperature of 950 °C. Some significant differences in those between coal chars and Petroleum Coke were found. The high temperature pyrolysis caused more easily the graphitization of Petroleum Coke than that of coal char, especially in the higher temperature range. The increasing pyrolysis temperature resulted in the decrease of surface areas of coal char and the increase of surface areas of Petroleum Coke. As the pyrolysis pressure was elevated from the atmospheric pressure to 3 MPa, surface areas of Petroleum Coke initially increased and then decreased, while those of coal chars presented an opposite tendency. The increasing pyrolysis temperature was adverse to the gasification activity of coal chars and was favorable for the gasification activity of Petroleum Coke. Also, the effects of the pyrolysis pressure on the gasification activity of coal char and Petroleum Coke were significantly different. The gasification activity of Petroleum Coke was obviously lower than that of coal chars, and even lower than that of the natural graphite.