Effects of Activation Conditions on the Properties of Sludge …
The activated coke prepared by the activation of mixed gas appeared to have ablated particles on the surface due to the ablation of the pore structure. In order to prepare activated coke with excellent adsorption performance, the physical and chemical properties of activated coke under different activation conditions were studied in detail.Web
اقرأ أكثرEffect of composition of coke deposited in delayed coker furnace …
HGI value of bad spalling coke was much higher (softer coke) and was in the range from 59 to 90 whereas that of good spalling coke was ranging from 38 to 43 (more hard & brittle coke). This analysis suggests that the good spalling coke was harder and more brittle making them prone to crack during thermal shock of online spalling vis-à-vis …Web
اقرأ أكثرPrediction of Calcined Coke Bulk Density | Request PDF
Vibrated Bulk Density (VBD) of calcined cokes is also related to properties of green coke such as Hardgrove Grindability Index (HGI) and volatilies content [7]. Dion et al. [7] showed that as the ...Web
اقرأ أكثرCHARACTERIZATION OF GREEN AND CALCINED COKE …
having 90% of the green coke's sulfur level; cokes with high sulfur up to 5% calcine to about 85% of the original sulfur level. The remaining sulfur in the calcined coke is liberated …Web
اقرأ أكثرCoker Feedstock Characteristics and Calcined Coke Properties
Volatile matter (VM) analysis of green petroleum coke is an important measurement for determining the calcination behavior and properties of calcined coke. Green cokes with high VM (>12%) are more ...Web
اقرأ أكثرA Study to Predict CSR of Coke, Produced from Weathered Coal
Abstract In this study straight coals were weathered in open piles at Bhilai Steel Plant (BSP). Imported Hard coals were selected for the studies. Several weathering indicators such as Alkali Extraction test (Transmittance), Free Swelling Index (FSI), pH of coal slurry, petrography were used to monitor weathering of individual coal. In order to …Web
اقرأ أكثرEffect of Operating Conditions on the Coke Formation and Nickel
Catalytic cracking of toluene as a tar model compound was carried out to investigate the effect of operating conditions on the coke formation and performance of nickel catalyst. The deactivation of catalyst depended on the quantity and nature of deposited coke, which were affected by the operating conditions, including temperature, …Web
اقرأ أكثرA Modified Model for Kinetic Analysis of Petroleum Coke
In this study, a nonisothermal kinetics analysis of petcoke was performed at heating rates of 10, 15, and 20°C/min using thermal gravimetric analysis (TGA). The behaviour of petcoke at different gasification stages (dewatering, volatilization, char burning, and burnout) was studied. The effect of heating rate on the activation energy of petcoke …Web
اقرأ أكثرImpact of feed properties and operating parameters on delayed
Petroleum Coke General Properties: Volatile Combustible Matter (VCM) • VCM is unconverted pitch – Target 12% Max, fuel coke 9% to 10% – 14% VCM is very high; Coke will be soft • Increases green coke hydrogen content • Rules of thumb for control in fuel coke – Increase heater outlet 5-7 °F for 1% decrease in VCMWeb
اقرأ أكثرNumerical Investigation of the Effects of Coke on Transport Properties
In this paper, finite element method was used to study the effect of coke deposition on heat and mass transfer during the catalytic partial oxidation of ethanol in a packed bed reactor. The properties of Ni/Al 2 O 3 catalyst bed were investigated after being subjected to several hours of carbon buildup. Bed permeability, porosity, and ...Web
اقرأ أكثرProfitable Calcining of Non-Calcinable Pet Coke
green coke available e.g. in Brazil, Argentina, Indonesia could also be calcined, if shaft kiln technology would be introduced outside of China. In Table 1 the properties of green coke for shaft kiln calcination versus Rotary Kiln calcination are compared. Property Unit Shaft Kiln Rotary Kiln Water content VCM HGI Sizing: > 16 mm > 4 mmWeb
اقرأ أكثرQuantification of the microstructure, effective hydraulic radius and
The effects of the coke deposition on the pore topology and the permeability were analyzed. The coke deposition pattern showed significant deposition in the pore throat. Analyses of the pore size distribution lead to a more reasonable geometric approach to measure the effective hydraulic radius for the better permeability prediction.Web
اقرأ أكثرProfitable Calcining of Non-Calcinable Pet Coke
VCM HGI Sizing: > 16 mm > 4 mm < 1 mm % % % % % 1 - 8 10 - 16 80 - 120 5 - 20 30 - 55 20 - 40 5 - 10 8 - 12 70 - 90 25 - 35 45 - 60 10 - 20 Table 1: Green coke properties in Shaft versus Rotary Kiln As can be seen in shaft kilns very fine material with higher VCM's can be calcined which can not be calcined in rotary kilns where VCM's areWeb
اقرأ أكثرGeneration and characterization of coal-based needle coke …
The green needle coke was transferred to a tube-type resistance furnace for calcination. Briefly, the green needle coke was heated to 1400 °C for 1 h at a heating rate of 5 °C min −1, and pure N 2 was used as an inert atmosphere. Needle coke was obtained after the calcination, which was denoted as CLP-A X-C (X represents the added content ...Web
اقرأ أكثرModels of coke quality prediction and the relationships to input
Within the coke making industry, the ability to accurately predict the quality of the coke produced from a variety of global coal basins is critical in both coal selection and blast furnace control. However, due to the complexity of the coke making process, the prediction of the resulting coke properties is a difficult task.Web
اقرأ أكثرEffect of coke orientation on the electrochemical properties of …
3.1 Macro crystalline properties of graphite In the present study, regular coke and needle coke, which exhibit dierent crystallinity and orientation, were gra-phitized to investigate the lithium-ion storage mecha-nism and anode characteristics depending on the crystal-linity change. The regular coke and needle coke samplesWeb
اقرأ أكثرConsiderations for repurposing a fuel-grade coker
In addition to CTE, other properties that can affect the performance of a graphite electrode are electrical resistivity, coke hardness, sulphur content, and nitrogen content. Table 1 provides typical needle coke properties. General overview The base coker unit configuration for a needle coking operation is similar to that of fuel-grade coke.Web
اقرأ أكثرImpact of Feed Properties and Operating Parameters on …
Petroleum Coke General Properties: Volatile Combustible Matter (VCM) • VCM is unconverted pitch – Target 12% Max, fuel coke 9% to 10% – 14% VCM is very high; Coke will be soft • Increases green coke hydrogen content • Rules of thumb for control in fuel coke – Increase heater outlet 5-7 °F for 1% decrease in VCMWeb
اقرأ أكثرImpact of feed properties and operating parameters on delayed
Sulfur Nitrogen Metals Ash Granulometry (fines) Petroleum Coke General Properties: Volatile Combustible Matter (VCM) VCM is unconverted pitch Target 12% Max, fuel coke 9% to 10% 14% VCM is very high; Coke will be softWeb
اقرأ أكثرHGI [-]
To a certain degree, the VBD can be predicted from the green coke properties, such as the HGI and the volatiles content. The quality of such a prediction is illustrated in Fig. 1 for different cokes produced at the Strathcona calciner. There is a fair correlation between the green coke HGI and the VBD of the corresponding calcined cokes.Web
اقرأ أكثرManaging Green Petroleum Coke Properties Variations on
As voids between fine particles increase in CP Coke and high Sulfur green petroleum coke (~4.9%) used in the blend with the imported coke having high sulfur …Web
اقرأ أكثرElectrical Resistivity Measurement of Petroleum Coke Powder
Carbon anodes used in Hall–Héroult electrolysis cells are involved in both electrical and chemical processes of the cell. Electrical resistivity of anodes depends on electrical properties of its constituents, of which carbon coke aggregates are the most prevalent. Electrical resistivity of coke aggregates is usually characterized according to …Web
اقرأ أكثرPrediction of CRI and CSR of cokes by two-step
Properties of coals, coal blends and cokes (type I and II) were determined experimentally; in addition to these measured data, the properties of coal blends and cokes (type II) were also calculated as weighted averages. The weighted averages of coal blend properties were calculated using Eq. (1) and weighted averages of coke indexes (type II ...Web
اقرأ أكثرEffect of coke properties and its blending recipe on
The properties and blending recipe of petroleum cokes used to make high quality carbon anodes for aluminium electrolysis were studied. Three kinds of green cokes were selected for bench scale study to illustrate the effects of cokes properties and its blending recipe on anode performances. The results show that impurities derived mainly …Web
اقرأ أكثرToward Understanding the Formation of Coke during the MCS …
In the Müller–Rochow process, where CH3Cl reacts with silicon to form methylchlorosilanes, copper is used as a catalyst. To provide insight into mechanisms leading to coke formation in the process, the interactions and decomposition of CH3Cl with four different surface orientations of copper were investigated by means of density …Web
اقرأ أكثرAnalysis and Characterization of High-Volatile Petroleum Coke
that volatile The coke volatile matter is composed of heavy hydrocarbons hydrocarbon are deposited in the coke matrix and fill the pores. The high which 9 of and 21% has matter not (wt.), smell. been content The calcined of volatile green is generally matter coke gives but green premium cokes have volatile matter content less than 5% (wt ...Web
اقرأ أكثرREFINERS EXCHANGE EXPERIENCES ON FCC PROBLEMS, COKING …
Decrease of 1 wt % VCM requires an increase of 7-9 F. coke-drum vapor line temperature. Decreasing cycle time by 6 hr increases coke VCM by 1 wt %. Bulk density of the coke is a function of the ...Web
اقرأ أكثرMOLECULAR COMPOSITION OF NEEDLE COKE …
Needle coke is a premium solid carbon used in manufacturing graphite electrodes for electric-arc furnace. For the first time in the open literature, this study reports data on the molecular composition of the feed that is actually introduced into the coke drum for delayed coking after fractionating the decant oil feedstock togetherWeb
اقرأ أكثرDESIGN, OPERATION FACTORS CAN UP COKER LIQUID …
A decrease in pressure has the effect of vaporizing more of the heavy hydrocarbon liquid that would otherwise be trapped in the coke drum and converted to coke and light hydrocarbons (Table 1).Web
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