scholarly journals Effect of pyrolysis temperature on desulfurization performance of high organic sulfur low rank coal

2021 ◽  
Vol 57 (1) ◽  
pp. 27-32
Author(s):  
W. Xia ◽  
W. He ◽  
J. Sokolović
Keyword(s):  
Sulfur Content ◽  
Pyrolysis Temperature ◽  
Calorific Value ◽  
Low Rank ◽  
Organic Sulfur ◽  
Low Rank Coal ◽  
Coal Cleaning ◽  
Liquid Products ◽  
Low Sulfur Content ◽  
Low Sulfur

The sulfur in coal not only influences the coke quality but also pollutes the environment during the combustion. The desulfurization of high organic sulfur coal is a key issue in coal cleaning science. As the pyrolysis has been used in low-rank coal conversion to obtain gas/liquid products and coal char, the desulfurization effects of pyrolysis on the low-rank coal with high organic sulfur requires further studies. This study investigated the desulfurization performance of high organic sulfur low-rank coal by the pyrolysis and the changes in the coal calorific value and sulfur forms during the pyrolysis. The XPS was applied to analyze the changing regulation of sulfur that forms on coal surface. The results indicated certain amount of FeS was newly created during the pyrolysis and high amounts of sulfate sulfur was transferred to pyrite sulfur and formed more FeS2 when compared to the distribution of raw coal. The total sulfur content of coal was reduced from 2.32% for raw coal to 1.68% for 700 °C pyrolysis coal and then the pyrolysis temperature had little effect on the sulfur content. The net calorific value (at constant volume and air-dry basis) was increased from 17.38 kJ for raw coal to 24.35 kJ for 700 °C pyrolysis coal. The pyrolysis temperature of 700 °C may be the best pyrolysis temperature for both low sulfur content and high calorific value.

POLLUTION OF THE ATMOSPHERE OF PRIANGARIA BY EMISSIONS OF CHPP-11 (USOLYE-SIBERIAN CITY)

2018 ◽  
Vol 1 (12) ◽  
pp. 222-227
Author(s):  
Veronika Makarova ◽  
Kseniya Dudareva ◽  
Natal'ya Malyshkina
Keyword(s):  
Environmental Pollution ◽  
Sulfur Content ◽  
Calorific Value ◽  
Ash Content ◽  
Low Sulfur Content ◽  
Low Sulfur ◽  
The Town

. The article deals with the problem of environmental pollution in the town of Usolye-Sibirskaya CHPP-11, which operates on the Zabituiskoye coal coals, which have an increased sulfur content (4,1%) and ash (23,0%). It is proposed to replace coal from the Zabituiskoye field with coal of the BZR grade of the Tulun section with reduced ash content, low sulfur content and good calorific value.

Investigation of the qualities of some promising oils of the Absheron oil and gas region

2021 ◽  
Vol 02 ◽  
pp. 22-26
Author(s):  
Yu.A. Abdulayeva ◽  
◽  
N.H. Alekperova ◽  
S.B. Logmanova ◽  
N.F. Kafarova ◽  
...  
Keyword(s):  
Sulfur Content ◽  
Oil And Gas ◽  
Viscosity Index ◽  
Hydrocarbon Composition ◽  
High Viscosity ◽  
Group I ◽  
Oil Fractions ◽  
Low Sulfur Content ◽  
Selective Refining ◽  
Low Sulfur

The article presents the characteristics of characteristic oils of the Apsheron oil and gas region, as well as the hydrocarbon composition of light and oil fractions. Oils of the Apsheron oil and gas region in terms of light fractions, sulfur content, and density are comparable to marketing grades of oils. The standards for prices are: graded crude oil WTI, Light Sweet, Brent, and Russian oils Sokol, Urals, Siberian Light are approaching them. We have studied in detail the yields and hydrocarbon composition of light and oil fractions of oils from the Apsheron oil and gas region. To obtain oils with a high viscosity index, studies were carried out to change the structure of oil fractions using hydrogen using the example of oil fractions of Azeri oil. Due to the significant content of aromatic hydrocarbons, schemes for the processing of oil fractions have been developed, including selective purification of distillates, dewaxing (except for Guneshli oil), as well as hydrocatalytic treatment in a severe mode in the presence of industrial Russian catalysts. As a result, it was possible to obtain API group I oils, according to the viscosity classification corresponding to SAE 20 and SAE 30. Thus, a study of the qualities and hydrocarbon composition of oils from the Absheron oil and gas region showed that these oils are characterized by a high content of light fractions, low density, and low sulfur content. According to these indicators, these oils correspond to the marker oils. In order to obtain base oils with a viscosity index of ≥90 and an aromatic hydrocarbon content of ≥10, a traditional refining method was used: selective refining, dewaxing, and severe hydrotreating.

Evaluation of the thermal properties of diesel oil with low sulfur content

2017 ◽  
Vol 131 (1) ◽  
pp. 697-704 ◽  
Author(s):  
Camila G. D. Peixoto ◽  
Valter J. Fernandes ◽  
Ana C. F. Coriolano ◽  
Renkel R. Araujo ◽  
Glauber J. T. Fernandes ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Sulfur Content ◽  
Diesel Oil ◽  
Low Sulfur Content ◽  
Low Sulfur

The Torsional Properties of Normal and Sulfur-Enriched Wool Fibers

1969 ◽  
Vol 39 (3) ◽  
pp. 261-266 ◽  
Author(s):  
L. D. Armstrong ◽  
M. Feughelman
Keyword(s):  
Mechanical Properties ◽  
Sulfur Content ◽  
Distilled Water ◽  
Constant Degree ◽  
Wool Fibers ◽  
The Difference ◽  
Decreasing Ph ◽  
Low Sulfur Content ◽  
Low Sulfur ◽  
Torsional Properties

The mechanical properties in torsion of single wool fibers of biologically produced high- and low-sulfur content have been studied to determine the effects on torsional behavior. The modulus of rigidity and the torsional relaxation, i.e., the decay in torque with time at a constant degree of twist, were determined in fibers tested in glycerol (~0% RH), distilled water, and aqueous solutions of HCl at pH 0.8, 1.8, and 2.9. The sulfur content had no significant effect on the modulus of ridigidy or on the magnitude of the torsional relaxation of dry fibers. Again, for fibers tested in distilled water, no significant effect of sulfur content on the modulus of rigidity was observed, but the percent decay in torque was measurably affected. The decay in torque in 1 hr for fibers of normal wool amounted to 23% of the initial torque and that for fibers of sulfur-enriched wool amounted to 15%. This difference in torsional relaxation behavior of wet fibers of the two wools was not thought to be due to the difference in sulfur content but may partly be linked with the aspartic acid content of the two wools. The modulus of rigidity and the torsional relaxation of fibers in aqueous HCl decreased with decreasing pH to as little as one third of the values obtained in distilled water, presumably due to the breaking of salt links, the decrease being greater for the sulfur-enriched wools.

scholarly journals A global response to sulfur starvation inPseudomonas putidaand its relationship to the expression of low-sulfur-content proteins

2007 ◽  
Vol 267 (2) ◽  
pp. 184-193 ◽  
Author(s):  
Colin Scott ◽  
Margaret E. Hilton ◽  
Christopher W. Coppin ◽  
Robyn J. Russell ◽  
John G. Oakeshott ◽  
...  
Keyword(s):  
Sulfur Content ◽  
Global Response ◽  
Sulfur Starvation ◽  
Low Sulfur Content ◽  
Low Sulfur

Research on the Microwave Pyrolysis of Coal under N2 Atmosphere

2014 ◽  
Vol 672-674 ◽  
pp. 672-675
Author(s):  
Jun Zhou ◽  
Zhe Yang ◽  
Wen Zhi Shang ◽  
Yong Hui Song ◽  
Xin Zhe Lan
Keyword(s):  
Flow Rate ◽  
Microwave Power ◽  
Loss Rate ◽  
New Technology ◽  
Low Rank ◽  
Low Rank Coal ◽  
Weight Loss Rate ◽  
Pyrolysis Products ◽  
Microwave Pyrolysis ◽  
Liquid Products

Microwave pyrolysis of low rank coal is a new technology of cleaner production. The effect of microwave power and flow rate of N2 on the yield of pyrolysis products under N2 atmosphere was explored. The results showed that the higher microwave power was, the higher all the terminal temperature, the yield of liquid products and the weight loss rate were. The flow rate of N2 had little influence on the yield of pyrolysis solid products, while it exerted a greater influence on the yield of pyrolysis liquid products. When the low rank coal was pyrolysised under the conditions of microwave power of 800W and flow rate of N2 of 4.0×10-4 m3/min, the yield of Bluecoke and liquid products respectively reached 65.8% and 18%.

scholarly journals Effective extraction of high purity sulfur from industrial residue with low sulfur content

2020 ◽  
Vol 9 (4) ◽  
pp. 8117-8124
Author(s):  
S. Suárez-Gómez ◽  
L. Bonavera ◽  
J. Carballido-Landeira ◽  
P. Blanco ◽  
F. Blanco ◽  
...  
Keyword(s):  
Sulfur Content ◽  
High Purity ◽  
Industrial Residue ◽  
Low Sulfur Content ◽  
Low Sulfur

Advances in Carbon-Based Nanocomposites for Deep Adsorptive Desulfurization

2020 ◽  
pp. 63-91
Author(s):  
Saddam A. AL Hammadi
Keyword(s):  
Sulfur Content ◽  
Carbon Nanomaterials ◽  
Operating Cost ◽  
Adsorptive Desulfurization ◽  
Transportation Fuels ◽  
Light Cycle Oil ◽  
Ultra Low Sulfur Diesel ◽  
Cycle Oil ◽  
Low Sulfur Content ◽  
Low Sulfur

The ultra-low sulfur diesel (ULSD) is required to comply with stricter government policy on low sulfur content of transportation fuels. Better knowledge of the different factors that concern deep desulfurization of fuels is necessary to achieve ultra-low sulfur content and cheaper way of producing ULSD. Both the capital and operating cost of the adsorptive desulfurization process is cheaper compare to the conventional hydroprocessing. In the future, the need to produce more volume of fuels with very low sulphur content from low-grade feedstocks like heavy oil and light cycle oil in order to meet up with the global demand for sulphur-free fuels is pertinent. Several on-going researches are pointing to the use of adsorbents for removal of sulfur compounds from hydrocarbon refining stream. In this chapter, varieties of carbon nanomaterials suitable for adsorptive desulfurization are discussed. If the active lifetime, where the capacity of the adsorbents are adequate, the approach is practically feasible for commercial application.

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