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Том 62, № 11 (2019)
- Год: 2019
- Статей: 9
- URL: https://ogarev-online.ru/1068-364X/issue/view/14003
Coal
Ash Composition of Lignite
Аннотация
Five lignite samples from Russia’s Itatsky, Munai, Arkharo-Boguchansky, and Kangalassky fields and the Mongolian Baganuur field are characterized on the basis of technical analysis, their elemental composition, calorific value, petrographic composition, and the properties of their mineral component. Experimental data regarding the chemical composition of their ash residues permit empirical calculation of temperatures characterizing ash fusibility, the temperature of normal liquid slag removal, and the temperature of slagging onset. The melting temperatures are found to rise with increase in content of the acidic oxides SiO2 and Al2O3 in the ash residues but to fall with increase in the concentration of Fe2O3, CaO, and MgO.
493-497
Specific Surface and Porosity of Coal
Аннотация
The specific surface and porosity of Belovo coal are determined. Coal samples undergo adsorption–structural analysis at the liquid-nitrogen temperature and at different relative partial pressures, on Sorbi N.4.1 and Termosorb TPD 400 instruments and also on the Micromeritics ASAP-2020 static vacuum system.
498-501
Coke
502-514
Predicting the Hot Strength of Coke on the Basis of Batch Characteristics
Аннотация
By means of a regression model, the strength CSR of coke after reaction with carbon dioxide may be predicted at the stage of batch formulation. This model takes account of the data from technical, petrographic, and plastometric analysis of the batch. On that basis, the value determined on the basis of the rank composition may be refined. The model is developed for the raw materials available at PAO NLMK on the basis of statistical data. That allows the coking conditions to be taken indirectly into account. The model is incorporated in computer software.
515-522
Study on the Influence Factor of Coke Pulverization Rate and Its Effect on Operating Index of Large Blast Furnace
Аннотация
The carbon dissolving reaction is the main factor for the deterioration of coke in the blast furnace. Therefore, in order to investigate the effect of coke deterioration on the permeability of blast furnace, the Coke Pulverization Rate (CPR) which represented the degree of Matrix carbon loss after carbon dissolution was put forward in this paper. The results showed that the CPR increases with the increase of volatile of coal blending, ash content of coke, M10 and coke reactivity index (CRI), while decreases with the rising of M40 and coke strength after reactivity (CSR). Analysis of the production data of 5BF blast furnace of Meishan Steel showed that under the conditions of coke ash (Ad) < 12.2%, M10 < 6.5%, M40 > 87%, CRI < 26% and CSR > 66%, the CPR would be less than 23%, which is conductive to ensure stable permeability large blast furnace.
523-528
Chemistry
Structure and Applicability of Sorbents Produced from Coke Dust
Аннотация
Given the seriousness of environmental pollution by organic materials and the need for corresponding sorbents in treatment systems, methods of producing sorbents by thermochemical activation of coke dust are considered. The structure of the sorbents is studied, and their use in toluene processing is recommended. Disposal of the sorbents within the coke plant is feasible. Outside the coke plant, the use of coal-based sorbents as active filler in road laying decreases hydrocarbon emissions from the bitumen.
529-531
Using Coking Byproducts in Paint Production: a Comparison of Quality Standards
Аннотация
Standard documents regarding the quality of coke-plant products are compared with standards regarding raw materials for paint and varnish production. The requirements on six products are totally consistent: benzene, indene–coumarone resin, coal tar, coal-tar solvent, solvent naphtha, and toluene. Ammonium sulfate and sulfuric acid may be used after additional treatment.
532-535
Quality Control
Optimizing the Radioisotope Gamma-Albedo Analysis of Quasi-Binary Media
Аннотация
A formula is proposed for assessing the sensitivity of radioisotope γ-albedo analysis of quasi-binary media, such as coal. The sensitivity is investigated as a function of the γ energy and the composition of the quasi-binary medium. A model is outlined for optimizing the parameters of the method so as to minimize the errors.
536-538
Utilization of Production Wastes
Fuels Derived from Papermaking and Coffee Wastes
Аннотация
A two-stage technology permitting pyrolytic conversion of biomass to gaseous fuel is considered, for the example of papermaking and coffee wastes: sawdust, sludge, and parchment hulls from coffee beans. Analysis of the initial materials and the products of thermal processing shows that 1 kg of biomass yields 1.23–1.41 m3 of producer gas. The calorific value of the gas produced is 10.69–10.74 MJ/m3. The yield of biochar is 25.1–29.5% (in the dry state).
539-543