Product category:
Solid Waste Disposal and Land Pollution
News Release from: Mono Pumps | Subject: TR Muncher
Edited by the Processingtalk Editorial
Team on 13 July 2005
Vital Muncher role in alternative fuel
production
TR Munchers from Mono are playing a vital role in the smooth running of the SRM award winning waste management plant at Heysham in Lancashire, using waste solvent as a fuel
TR Munchers from Mono are playing a vital role in the smooth running of the SRM award winning waste management plant at Heysham in Lancashire The facility processes and blends organic wastes to produce a replacement for fossil fuels in cement kilns
This article was originally published on Processingtalk on 5 Dec 2006 at 8.00am (UK)
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Solvents typically contain a significant proportion of solids - rags in particular, which can account for some 10 to 12% - and the Munchers reduce solids to a dimension that will pass through a 6 to 8mm mesh.
Experience has shown that coarse screening is too impractical because it results in constant blockages and necessitates a high level of routine maintenance.
The TR Munchers fitted in this process are from the latest generation of twin shaft grinders.
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In common with other members of the Muncher Family, TR models are twin shaft, slow speed, high torque grinders.
Each shaft is fitted with a series of interleaving cutters and spacers that give real "positive displacement" grinding of solids.
The operation of the shafts at differential speeds produces a tearing action on solids, while the leading edge and sides of the cutter teeth crop and shear to produce small pieces.
At the same time the circumferential land of the cutter crushes friable or brittle material.
The low speed, typically 50 to 80 rpm gives a high torque capability while saving power and minimising abrasive wear rates.
Ideally suited to the application, the layback cutter shafts on this type of Muncher are set at an angle to the incoming flow - a design which is more effective in capturing irregular shaped objects.
If a rejection cycle is necessary, the object can drop into the built-in trash trap, set below and clear of the cutter stacks.
In the present configuration the Munchers can cope with 60 cubic metres of waste solvent an hour.
Before the advent of secondary liquid fuels (SLFs), this waste, from process paints and printing inks, had no use and went into landfill or incineration.
The very high temperatures achieved in the cement kilns, around 1450 degrees Celsius, ensure complete combustion of all organic materials.
The combustion of secondary liquid fuel in place of coal is in line with government and EC policy and has been judged by the Environment Agency to produce an overall reduction in environmental impact.
Studies have shown a net drop in emissions at cement plant which have converted to burning SLFs, reducing the use of precious fossil fuels and recovering energy from organic wastes that were otherwise difficult to dispose of.
SRM is one of the largest European companies in the field of organic waste disposal, processing around 300,000 tonnes a year.
Solving waste problems through recycling or energy recovery is its speciality, and the ISO14001 registered company operates a total of seven sites in the UK.
SRM was acquired by the worldwide building materials group Heidelberg Cement in 1999 because of the considerable business synergy which it had with their cement-producing operations.
The SRM commitment to schemes with net environmental benefits is also demonstrated by the Heysham plant self-sufficiency in energy thanks to the exploitation of the previously unwanted distilled fractions from the process to generate power.
Another is the pilot scheme currently in operation to reprocess car oil filters to remove the lubricant for recycling and recover energy from the solids.
Profuel, as it is known, constitutes a further potential fuel for cement kilns.
In addition to a Mono Muncher, this system is also fitted with a Mono type M progressive cavity pump.
SRM also developed a process for dealing with drums of solvent waste which dispensed with the need to empty them manually.
This highly innovative plant automatically extracts the solvent before shredding the drums and cleaning the fragments.
The steel is then separated out and can be used again.
Traditionally 45 gallon drums were generally used in landfill because they remained contaminated after recycling of their contents and could not be re-used.
The drum shredder won the Queen's Award for Enterprise in 2001.
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