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Light oil (coal), semi-coking process
Light oil (coal), semi-coking process chemical information summary.
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Variations in toxicity of semi-coking wastewater treatment …
The variation of biotoxicity in the semi-coking wastewater treatment processes implies that the coagulation and adsorption processes resulted in more efficient biotoxicity …
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Simultaneous biodegradation of phenolics and petroleum …
The microbial community consisting of Pseudomonas stutzeri N2 and Rhodococcus qingshengii FF could effectively and simultaneously remove phenols and petroleum hydrocarbons, and these two strains possess great potential of being applied in aerobic biological treatment process of large-scale semi-coking wastewater.
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Optimized electrochemical treatment of semi-coking wastewater …
The process optimization experiment was carried out by adjusting the dilution multiples of semi-coking wastewater to 20, 50, 100, 200, 500 and 1000, respectively. It can be seen from Fig. 4 b that the removal rates of COD, NH 3 -N and VP continued to increase when diluted 20–200 times, and the removal rate decreased when diluted 200 ∼1000 ...
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Review article A review of the state-of-the-art
The detailed information about the molecular structure transformation in the thermoplastic stage has not been acquired. Therefore, the insight into and the establishment of the 3D carbon structures of the semi-coke during the coking process is crucial for achieving a comprehensive understanding of the carbon structure evolution.
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Coking
Delayed coking process variables include process operating variables, feedstock properties and engineering variables. ... Typically, coke can be divided into spherical shot coke (isotropic, amorphous, with almost no pores), sponge coke (semi-isotropic), and needle coke (anisotropic, regular crystalline structure, containing numerous fine pores ...
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Self-doped N, S porous carbon from semi-coking wastewater
coking wastewater, but the COD concentration of semi-coking wastewater is approximately 10 times higher, and the concentrations of ammonia nitrogen and phenols are also significantly higher than coking wastewater (Bokun et al., 2020). Semi-coking wastewater is the most harmful type of wastewater due to its high COD and high toxicity (Ma et al.,
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Simultaneous biodegradation of phenolics and petroleum …
The emergent semi-coking wastewater had the characteristics such as large amounts of discharge, high toxicity, high concentration ammonia nitrogen and chemical oxygen demand (COD), which make it more difficult to treat by biological method (Ailijiang et al., 2021).Phenols and petroleum hydrocarbons with higher concentration were concurrently …
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Mechanism of carbon structure transformation in plastic layer and semi
The transformation of the carbon structure of coal during the coking process influences the coke microstructure and microtexture, and ultimately, the coke quality. ... Mechanism of carbon structure transformation in plastic layer and semi-coke during coking of Australian metallurgical coals. / Chen, Yixin; Lee, Soonho; Tahmasebi, Arash et al.
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Delayed Coking, Fluid Coking
Delayed coking is a semi-continuous process in which the heated charge is transferred to large soaking (or coking) drums, which provide the long residence time needed to allow the cracking …
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Shrinkage Character in the Process of Semi-coke Formation
3.1 The Heating Rate of Coal in Coking Chamber Temperature conditions in a coal charge during coking depend on the location towards heating walls of a coke oven. In general, temperature distribution in a coal charge during coking process is mainly connected with the location towards heating walls and with the time of coking. Three zones have
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Self-doped N, S porous carbon from semi-coking wastewater …
As seen in Supplementary Figures S1,S2 and Supplementary Table S1, N and S elements in semi-coking wastewater were detected by XRD and GC-MC analysis.Moreover, elemental analysis was employed to investigate the element species and content of the intermediate product NSPR. Supplementary Table S2 illustrates the results, which confirm that …
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Emerging concerns of VOCs and SVOCs in coking
In this study, the distribution profiles, emission characteristics, and health risks associated with 43 volatile and semi-volatile organic compounds, including 15 phenols, 18 polycyclic aromatic hydrocarbons (PAHs), 6 BTEX, and 4 other compounds, were determined in the wastewater treatment plant (WWTP) of a coking factory (plant C) and the succeeding final …
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Variations in toxicity of semi-coking wastewater treatment
Five benzenes, 11 phenols, and five polycyclic aromatic hydrocarbons (PAHs) were investigated as the dominant contaminants in semi-coking wastewater. Because of residual extractant, the phenols extraction process increased acute toxicity to V. fischeri and immobilization and lethal toxicity to D. magna.
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Co-substrate promoting the biodegradation of refractory DOM in semi
As illustrated in Fig. S1, the designed semi-coking wastewater treatment processes of a coking enterprise in Yulin, Shanxi Province, China, consisted of pretreatment, biological treatment and advanced oxidation process with a capacity of ∼3000 m 3 /d. The pretreatment units included an oil-water separator, two ammonia-stripping towers, and a ...
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Evolution of carbon structure and cross-linking structure during coking
In this paper, five coking coals with different degrees of metamorphism were selected for coking experiments. XPS and HRTEM techniques were used to study the evolution of the carbon structure of the coking coal during the coking process, which provided theoretical support and a practical basis for a more reasonable, efficient, and environmentally friendly use …
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Synergistic removal of organics from semi-coke wastewater by …
Due to the late emergence of the semi-coke industry, there was no mature treatment process for semi-coke wastewater at home and abroad, and the existing treatment methods were mostly based on coking wastewater with similar water quality [8].At present, semi-coke wastewater treatment usually includes a two-stage process.
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Delayed Coking | FSC 432: Petroleum Refining
Delayed Coking. Figure 6.6 shows a flow scheme in a delayed coking progress and a photograph of a delayed coking unit. The s above the drums that contain the drill stems are used to drill out the coke from the coke drums at the end of the coking cycle. ... while coke is removed intermittently in a semi-continuous process scheme ...
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Review article A review of the state-of-the-art
Once the temperature of the coal charge exceeds the thermoplastic range, condensation, cross-linking, and repolymerization reactions take place. This results in the …
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Semi Coke
LFC process is designed and developed by the United States. The coal is dried and retorted into semi coke by inert gas heat carrier in two steps in two rotary furnaces of drying and retorting. COED process was proposed by the United States in 1962. Pulverized coal is dry distilled into semi coke by hot gas in four continuous fluidized beds.
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Production of Isotropic Coke from Shale Tar at Various …
In this paper, the authors analyze the properties and composition of shale coke obtained by coking of light and heavy shale oil fractions at temperatures around 500 °C and a variation of …
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Shrinkage Character in the Process of Semi-coke Formation
Semi-coke is made by charging coal into hot ovens, usually in the temperature range 350-500°C. Layers of plastic coal are formed parallel to the heated oven surfaces and these move …
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Industrial coal coke briquette making process, …
The degassed coal is semi-coke, it is broken into 3-4mm particle size, and briquetted with binder, then oxidized at 200-300 degrees Celsius to obtain hardened briquette. Finally, the briquette is coked at a temperature higher …
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Study on Combustion Kinetic Characteristics of Lignite and Semi-coking
As can be seen from Table 1, with the increase of pyrolysis final temperature, the percentage content of volatile matter, moisture, H, O, and S elements in semi-coking dust gradually decreases.This is because with the increase of temperature, water in lignite evaporates, and lignite structure contains a large number of oxygen-containing functional group structures, …
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Technological Advancements and Prospects for Near …
This review examines the technological bottlenecks, potential solutions, and future development directions in the treatment and resource utilization of semi-coking wastewater (SCOW) in China.
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Efficient degradation of semi-coking wastewater in three …
Semi-coking wastewater contains a rich source of toxic and refractory compounds. Three-dimensional electro-Fenton (3D/EF) process used CuFe 2 O 4 as heterocatalyst and activated carbon (AC) as particle electrode was constructed for degrading semi-coking wastewater greenly and efficiently. CuFe 2 O 4 nanoparticles were prepared by coprecipitation method and …
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Ozone catalytic oxidation of biologically pretreated semi-coking
All reagents were analytically pure and can be used directly without purification. The wastewater sample was BPSCW collected from a coal chemical plant in Hebei Province. The plant used a "semi-coke wastewater pretreatment + A/O" (Text S1) process to treat semi-coking wastewater. The characteristics of BPSCW were shown in Table S1.
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Intensified phenols extraction and oil removal for industrial semi
Current semi-coking wastewater treatment process has low performance of pollutants removal and consumes a large amount of high-grade steams. It far exceeds the semi-coke plants' utilities supply capacity and easily lead to the breakdown of whole treatment system. This paper identified the bottleneck of current process as followed: low removal ...
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From pollutant to high-performance supercapacitor: Semi-coking
Fig. 1 schematically illustrates the preparation of porous carbon material SWPR-x-y. First, SWPR is synthesized by reacting filtrated semi-coking wastewater with formaldehyde. The morphology and microstructure of the SWPR are consistent with those of pure phenolic resin [33], showing a spherical structure (Fig. S2a).SWPR has high N-O-S contents (Table S1) …
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Review article A review of the state-of-the-art research on carbon
This paper provides a review of the state-of-the-art research in the open literature on the carbon structure evolution in the semi-coke region following the last stage of the plastic layer transformation. Coking coals exhibit thermoplastic fluid-like behavior due to the change of chemical structures in plastic layers when heated in the coke ovens. Once the temperature of …
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