The Landscan LSPhd 62 is one of Land’s LSPhd 6 series of linescanners which, can monitoring the shell temperature of rotary kilns to prevent damage to the kiln shell and its lining due to excessively high temperatures and thermal shock results in high repair costs and irrecoverable loss of production. The refractory-lined lower end of the kiln can be subjected to temperatures of up to 2,000 degrees C, not to mention the effects of abrasion from the product itself. If the refractory is damaged, localised heating of the kiln shell may occur, creating a hot spot that, unchecked, will seriously damage and even warp the kiln.
But much of this can be avoided if the plant operator has a detailed knowledge of the degree to which the lining is worn (and therefore the likelihood of premature failure), along with the presence and magnitude of clinker-ring build-up. Conversely, monitoring the condition of the kiln refractories and stopping production for relining or repair only when necessary may lead to an extended campaign life with associated cost savings.
The LSPhd 62 is the most appropriate for kiln applications, covering temperatures from 100 to 600 degrees C. It is sufficiently compact to be installed where space is limited, and has a sapphire protection window for added durability. A built-in Class 2 laser to define the scan plane and sighting angle is supplied as part of the package, making the initial set up quick and simple.
A complete range of mounting assemblies, water cooling and air purging options are also available – and the scanner head can be de-mounted for maintenance and put back in position without the need for realignment.
Kiln Measurement Success Sotry
A linescanner from infrared temperature measurement specialist Land Instruments International has improved the monitoring of kiln shell temperatures at a cement factory in Cameroon. Mounted in a robust, air purged and cooled stainless steel enclosure at a distance of 27 metres from the kiln, the Landscan LSP 62 infrared linescanner continuously scans almost the entire 55-metre length, relaying a thermal map to the control room so that staff can adjust process variables accordingly. It also gives immediate warning of worn or missing refractories in the kiln lining.
Monitoring was previously limited to manual checks using a hand-held infrared thermometer. Only 20 metres of the kiln shell was accessible for checking in this way, but it took a full hour to take the readings at 1-metre intervals – which were then entered onto a PC for evaluation.
With the kiln operating at up to 500 degrees C and an ambient temperature of around 45 degrees C, collecting readings was an extremely difficult task for the operating and maintenance engineers.
Three metres in diameter and 9.10 metres in circumference, the kiln makes 4.5 revolutions per minute at a speed of 750 mm per second. It is scanned through an angle of 80 degrees with a field of view of 100:1 (95% energy), and each revolution triggers an encoder that saves the completed scan and displays it in the control room alongside the live data from the next.