The
first successful roller press was designed in Belgium by Louiseau in response
for the need for a small briquette that could be transported over long distances.
Roller presses are machines that achieve compaction of particulate matter by
squeezing the material between two counter rotating rollers. Pockets formed in
the working faces of the rollers form egg or pillow shaped briquettes that
weigh in the order of 45 g each. Presses with capacities from 25 to 100 ton per
hour can be constructed. Little has changed in the basic design of the presses,
major improvements being in the way in which the pressure is applied to the
rolls, the materials of construction to improve life and the ease of changing
rolls and general maintenance.
Roller
presses can also be used with fluted rolls to produce sheets of material that
can then be broken up and screened to give a granular product. The granular
material would be suitable for mixing with power station feedstock and would
solve the handling and moisture problems associated with fine coal.
Briquettes
can be produced with the aid of binders or by the use of pressure only either
at low temperature or at a temperature where the coal is in the plastic state.
The introduction of the Clean Air Act in the U.K. in 1956 saw an increase in
high temperature briquetting to produce smokeless fuels from bituminous coals.
The advent of cheap North Sea natural gas saw the closure of these processes.
Cheap gas and oil has caused a reduction of coal briquette production in most
countries although development of briquetting technique has continued as a result
of the need to agglomerate many other materials. Improvement in plant
throughput has been achieved in a variety of industries by agglomerating the
raw feed to the process. Notable uses have been in glass production, iron
smelting, zinc refining and the fertilizer industry.
For more info, please visit roller press manufacturer.
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