Semicoke

Semicoke

 

a solid fuel residue obtained by the low-temperature carbonization of solid fuels. The properties and composition of semicoke are determined by the type of fuel and the method of low-temperature carbonization used. Semicoke contains up to 10–15 percent volatile matter, as well as undesirable impurities of ash and sulfur. It is an easily ignited, smokeless fuel with a high heat of combustion—not less than 309 megajoules/m3(7,400 kilocalories/m3). Varieties with a low ash content may be produced in the form of large cakes and are used as an efficient fuel, especially for domestic heating. Fine semicoke serves as an energy-producing fuel and is added to coking charges.

References in periodicals archive ?
Oil shale can yield shale oil, retorting gas, and semicoke by retorting technology [2, 3].
Our earlier study of the origin of these phenols showed that most of them still originate from the process water added to the waste residue and even from the groundwater that had been contaminated with phenols before it was used for cooling the semicoke [4].
Because the pyrolysis temperature is low and the technical process is fixable, therefore, it can be both final disposal to prepare some hydrogen-rich gas, tar, and semicoke, and so forth, for the future of the people's demand and middle disposal to realize the polygeneration with gases, tar, and semicoke which produced in pyrolysis process [810].
Lignite semicoke has similar chemical properties with activated carbon, but its price is only one-third of activated carbon or so, which can be widely used as low-cost adsorbent in the fields of flue gas desulfurization and denitrification, oil purification, and wastewater treatment [7-9].
When used for oil extraction, approximately half of the oil shale turns into semicoke during pyrolysis.
On continuous pyrolysis these mesophases are extensively deformed by bubble percolation; eventually viscosity significantly increases to allow further deformation and a fine fibrous microstructure of needle coke is established as the mesophase congeals to semicoke.
All these changes were due to semicoke formation, because in the range of about 350-500 [degrees]C the thermal degradation of coal proceeds, and gas (mainly hydrogen, methane and carbon oxides), reaction water and tar are evolved.
is also lagging behind in developing technologies for using coal in the future including processing coal into synthetic liquids, motor fuels, gas and semicoke.
The amount of minerals is high in oil shale, which after the thermal decomposition go over to semicoke. As a result, the ash content of semicoke becomes higher and its calorific value lower than oil shale's, which reduces the economic value of semicoke and restrains its use [7].
found that the action of semicoke in reforming reaction was similar to the effect of catalyst [6].
In 1990, 3.332 Mt of coke and semicoke was exported as compared with 3.156 Mt in 1989 (+5.2%).