High bulk density operation increases the coking pressure (force when the swelling of the molten coal pushes the oven wall) during coal carbonization to a great extent, which increases the force needed for coke cake pushing and in some cases leads to operational problems.
More commonly adopted carbon feed is coalgasified gas that has R < 2. Man et al. proposed COGtoolefin process with coalgasified gas [20]. Lin investigated polygeneration of methanol and power from COG and coalgasified gas with CO 2 recovery [21]. Similarly, Yi et al. developed and technoeconomically evaluated polygenerative COGto ...
In the coking process, the colloid released from coals could enhance the bond among coal particles. The cold tamping technology can improve the coke quality effectively.
Coke from coal is grey, hard, and porous and has a heating value of MJ/kg. Some cokemaking processes produce byproducts, including coal tar, ammonia, light oils, and coal gas. Petroleum coke (petcoke) is the solid residue obtained in oil refining, which resembles coke but contains too many impurities to be useful in metallurgical ...
The microscopy of coal and coke is emphasized and the effects of operating variables on coke microstructure and macrostructure are discussed. History of coke making Coke was an article of commerce among the Chinese over 2000 years ago. It was used in the arts and for domestic purposes but not in great quantities.
It shows that both coke quality and the behaviour of the coal charge during carbonization depend on the grade of coal (type and rank) and the operating parameters used for carbonization (bulk density and heating rate). The mechanical coke properties can be influenced by coal blending, by coal pretreatment and by the coking conditions.
Coal blending is the process of mixing coals after coal has been mined to achieve quality attributes that are desirable for the coal's intended application ( steam generation, coking ). [1]
An important problem at an integrated steelproducing plant is the blending of different types of coals to make coke for the blast furnace operation. Historically, linear blending models were not appropriate because coal properties important for both optimum cokemaking and blast furnace operation do not combine linearly and are not completely understood. In this paper, a solution methodology ...
An industrial coal blend was carbonized at the ENSIDESA industrial coking plants at 1230 and 1280 °C (T1 and T2) and at the INCAR coking test plant at 1180, 1220 and 1280 °C (T3, T4 and T5), respectively. The same coal blend was also preheated at 214 °C and then carbonized at 1200 °C (T6). The characteristics of the resultant tars (industrial T1, T2 and semiindustrial tars T3, T4, T5, T6 ...
Biomass addition to coal blend during cokemaking and its influence on the product coke quality is discussed. The partial and complete substitution of coke breeze with biochar in sintering process and its influence on the product sinter quality is explained. The impact of charcoal top charging or injection into blast furnace has been elaborated.
Coke is basically a solid residue from the destructive distillation of coal. However, coke making is a multistep complex process and present coking scenario is a result of series of development that has taken place since the latter half of 19th century. Starting from beehive oven the present day coke oven is a result of continuous effort to
The FischerTropsch process (FT) is a collection of chemical reactions that converts a mixture of carbon monoxide and hydrogen, known as syngas, into liquid reactions occur in the presence of metal catalysts, typically at temperatures of 150300 °C (302572 °F) and pressures of one to several tens of FischerTropsch process is an important reaction ...
When the mixed reducing gases are obtained from coal gasification, the MXCOL process is also called the coalbased Midrex process. Compared with BF production, the advantages of coalbased Midrex process are as follows [136]. (1) No coke, coke ovens or sinter plant are required (2) The costs and CO 2 emissions are reduced significantly. (3)
It is obviously seen that the stages of coal mining, cokemaking process and COG purification process contribute relatively higher impacts than other stages in every. ... Development and technoeconomic study of methanol production from cokeoven gas blended with Linz Donawitz gas. Energy, Volume 200, 2020, Article 117506.
Metrics Abstract The coal blends are used for both top and stamped charged coke oven batteries in Steel Plants which are consists of more than 5 to 7 individual coal sources depending upon the availability of coking coal. The blast furnace (BF) coke produced from the coke oven batteries are feed into both small and larger BF.
Coal, coke and the prediction of their properties. Metallurgical coke, derived from the pyrolysis of selected coals, plays several critical roles in the ironmaking blast furnace (Babich and Senk 2013; Bertling 1999; Biswas 1981).As a structural support, and source of permeability for the layers of softening iron materials, the selection of an appropriate coke can significantly influence ...
Blending of noncoking coals above 20% with the hard coking coals used in this research decreases the blend fluidity and impairs the coke quality. It was seen that the coals lose their fluidity on ...
The bituminous coal and 1/3 coking coal mixture at a 7:3 weight ratio was used as the carbon source of AC, and the blending modification method that integrates the preparation and modification in ...
One of the important technical subjects in blast furnace cokemaking is deterioration of hard coking coal quality. 1) In order to cope with this, various technologies to utilize semisoft coking coals by increasing coal charge bulk density in slottype coke ovens have been developed or commercialized such as dry coal charging process (CMC (Coal Moisture Control) 2) and DAPS (Drycleaned and ...
Fig. 1, Fig. 2 illustrate the schematic of the coking process and the heating process respectively. The properties of 1/3 coking coal used in the experiments are shown in Table, 10 g crushed 1/3 coking coal with a particle size of less than mm is charged into the cylindershaped crucible.
To help in building a recyclingoriented sustainable society, Nippon Steel Sumitomo Metal Corporation developed a waste plasticrecycling process using coke oven and put it into commercial operation in 2000. Now roughly 200,000 tons per year of waste plastics are processed in coke oven in Japan. In this process, the waste plastics collected from households are agglomerated to the sizes ...
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