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 ?
Firstly, oil shale is transported into a retort furnace to produce shale oil, semicoke and retorting gas.
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].
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.
Assessment of vegetation performance on semicoke dumps of Kohtla-Jrve oil shale industry, Estonia
Another topic to be dealt with in parallel is fast pyrolysis of oil shale where semicoke could be used as a source of solid heat carrier in order to increase the overall process efficiency.
The waste dump of limestone and oil shale residues differed from semicoke heaps in the absence of species A.
However, the oil shale industry employing these technologies [3] has yet to tackle with several critical problems, such as harmful semicoke waste, complicated multistage technological scheme for retorting [4], high energy consumption in ICP, etc.
Yield of the pyrolysis products of kerogen Product Yield, wt% Semicoke 18 Shale oil 72 Gas + losses 10
2% after bioleaching, that of semicoke decreased respectively from 81.
For example, Kiviter and Fushun retorting processes produce a large amount of harmful semicoke waste, and Galoter has a complicated multistage technological scheme.