Coke deposited in the reactor is removed through a cut with water under high pressure (about 250 bar). Delayed coking is a process that occurs in batch.

Intensified phenols extraction and oil removal for industrial semi-coking wastewater: A novel economic pretreatment process design. The bottleneck of current …

The EEM spectra of semi-coking wastewater during the hydrolysis acidification -aerobic process are illustrated in Fig. 2. Generally, the fluorescence peaks with Em > 380 nm are designated as humic-like fluorescence, while peaks with Em < 380 nm are ascribed to protein-like (tyrosine or tryptophan-like) fluorescence [28] .

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 ...

Semi-coking is a typical coal chemical process broadly applied in Yulin region of Shaanxi Province, China. Utilizing the locally mined high quality, low metamorphic coals, semi-coke, coal tar, and coal gas are produced through medium and low temperature pyrolysis (Zhang et al., 2017a, 2017b).

Mesophase coking mechanism demonstrated that the semi-coke microcrystals became gradually ordered during plastic stage. Metaplast theory had been widely accepted, however, it was still difficult to identify the physical morphology and chemical composition of "metaplast". ... the coking process can be deduced by coupling …

Considering the higher concentrations of COD, ammonia and toxic organic compounds in semi-coking wastewater, a physicochemical-biochemical combined …

Semi coke is the solid products, obtained from low-rank bituminous coal, lignite, or peat by carbonization at low temperature (500–750 °C) in a retort furnace. In general, semi coke is also a by-product or intermediate product of the conversion of coal into liquid and gaseous fuels (Fig. 1 ). Fig. 1.

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 ...

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.

Problems such as low concentration of organic pollutants in the biochemical effluent of coking wastewater and poor mass transfer efficiency have seriously affected the effectiveness of coking wastewater depth. Three-dimensional electrode oxidation processes (3DEOPs) are a very promising advanced oxidation process for wastewater …

Delayed coking is a process that occurs in batch. In order to make a semi-continuous process, it is always employed as pairs of reactors, wherein one reactor is under reaction, the other is in the decoking step, and so on. The delayed coking process occurs in cycles that can vary from 14 to 24 hours. The main operational variables of the ...

Abstract. The transformation of the carbon structure of coal during the coking process influences the coke microstructure and microtexture, and ultimately, the coke quality. …

Wastewater from a semi-coking WWTP located in Yulin, Shaanxi Province, China, with an average treatment capacity of 3000–5000 m 3 /d was studied. The WWTP applied a series of pretreatment and treatment processes, as shown in Fig. 1.The pretreatment units included an oil-water separator, a phenols extraction tower, an …

Section snippets Collection of wastewater samples and seed sludge. 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 …

Coking is a refinery unit operation that upgrades material called bottoms from the atmospheric or vacuum distillation column into higher-value products and, as the name implies, produces petroleum coke—a coal-like material. Exports of petroleum coke accounted for about 19% of the nation's finished petroleum product exports through …

The industrial coke is made of pulverized coal as raw material, processed by coals blending (or single coal) and then briquetting to briquette, after that through the coking process gets the coke and coke-type coal products. The product with carbonization temperature around 600 degrees is coal coke (semi-coke type coal), and the product with ...

Coking coal is a naturally occurring sedimentary rock found within the Earth's crust. Categories of coking coal include hard coking coal, semi-hard coking-coal or semi-soft coking coal, and coal for pulverized coal for injection (PCI). These apply to the different quality grades of the coking coal, all of which are used in ironmaking.

The coking coal quality was assessed in terms of its structural characteristics, reaction and interaction mechanisms and bed characteristics. This work was expected to scientifically evaluate coal quality and provide theoretical guidance for the precise control of coking process. 2. Materials and methods2.1. Materials

During the coking process, the majority of aliphatic groups transfer into aromatic clusters through aromatization and condensation, and with the removal of H bonds between molecules. ... 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 ...

In order to master the combustion kinetic characteristics of semi-coking dust in the early pyrolysis stage of lignite combustion explosion, a vacuum tube furnace was used to prepare semi-coking dust with different …

Because of residual extractant, the phenols extraction process increased acute toxicity to V. fischeri and immobilization and lethal toxicity to D. magna. The acute toxicity of pretreated wastewater to V. fischeri was still higher than that of raw semi-coking wastewater, even though 90.0% of benzenes, 94.8% of phenols, and 81.0% of PAHs …

Hard coking coals like anthracite have better coking properties than semi-soft coking coals, allowing them to garner a higher price. Australian HCC is regarded as the industry benchmark. While PCI coal is not often classified as coking coal, it still is used as a source of energy in the steelmaking process and can partially replace coke in some ...

During the coking process within the plastic range and with further temperature increase, the continuous removal of oxygen and hydrogen from the aromatic clusters occurs, ... YC4, a semi-soft coking coal, with the highest fluidity and vitrinite content and 16.53% oxygen content (due to its low rank), exhibited the lowest stable …

3.19.1.1.2 Coal is used in iron and steel industry. Coking coal is an essential input for production of iron and steel. The largest single use of coal in the steel industry is as a fuel for the blast furnace and for the production of metallurgical coke for reduction of iron ore or for injection with the hot blast.

The removal effects of main toxic organic pollutants in semi-coking wastewater by combined treatment process were investigated, while the genotoxicity relevance of wastewater from different treatment units were monitored by using Vicia faba bioassays. Results showed that 37 kinds of toxic organic po …

@article{Bokun2020IntensifiedPE, title={Intensified phenols extraction and oil removal for industrial semi-coking wastewater: A novel economic pretreatment process design}, author={C. Bokun and Yang Siyu and Wu Yangyang and Suo Miyangzi and Qian Yu}, journal={Journal of Cleaner Production}, year={2020}, volume={242}, pages={118453}, …

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 …

The semi-coke was further condensed to form large aromatic carbon lamellae above 823 K, and eventually converted to pitch coke. However, the understanding of the MCTP coking process merely from a conventional laboratory perspective is inadequate, and the underlying evolution mechanism of the MCTP coking process is …

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 ...