Organic materials with controlled particle size used for cleaning blades of gas
side of exhaust gas turbochargers in modern diesel engines. Industry’s most stringent
Advantages & Benefits:
TECO Asteroids are organic materials with controlled particle size used for cleaning blades of gas
side of exhaust gas turbochargers in modern diesel engines. The specific structure of asteroids is such
that when injected by means of compressed air upstream in the gas side of the turbine they cause a
slight abrasive action, which always keeps the turbine clean.
Once injected into the turbine, the asteroids burn and disappear into the atmosphere, through the stack
without causing any detrimental chemical reaction. The cleaning procedure recommended by most
manufacturers until now is cleaning with water. Although that method is efficient it presents a number of
drawbacks, such as reduction of the rpm of the engine during the entire cleaning process, which causes
a loss of speed. Furthermore there is always the risk of forming corrosive acids in presence of
sulphurous residuals in the discharge duct.
When used regularly, TECO Asteroids increase significantly the time between maintenance services.
Obviously, maintaining the turbine in a perfectly clean condition gives trouble free operation and
improves its efficiency.
Dry Cleaning System of Turbochargers with TECO Asteroids:
Instead of water, dry solid bodies in the form of granules, like asteroids, are used for cleaning. A certain
quantity of them, depending on the turbocharger size, is blown by compressed air into the exhaust gas
lines before the gas inlet casing. On account of their hardness and composition (natural solid granules,
size 1.3 - 1.7 mm) asteroids have an excellent mechanical cleaning effect (soft blast). As a rule, a turbine
should be cleaned every 24 to 48 hours of operation
TECO Asteroids are blown by compressed air into the exhaust pipes before the turbocharger. This
method of cleaning should be employed every 24 - 48 hours of full load operation. The interval between
cleaning operations depends on the degree of contamination and on the increase in exhaust gas
temperature after the turbine. Cleaning must be repeated if the gas temperature after the turbine on full
load rises to 20°C above the main temperature. For a turbocharger with several gas inlets, the inlets
should be cleaned one after the other.
On engines with several turbochargers, these should be cleaned one after the other. The gas inlet
temperature before the turbine must not exceed 580°C - 590°C in order to prevent severe burning of the
asteroids before the turbine. Since it is not possible to remove thick coatings with relatively small
quantities of ASTEROIDS, this method must be used more frequently. Injection of the ASTEROIDS into
the turbine is best performed at high turbocharger speed, to ensure efficient mechanical cleaning.
Installation of Asteroids Cleaning System:
For engines with several turbochargers, clean one after the other as follows:
Attention: It may occur that, during dry cleaning of the turbine, a small part of blown-in asteroids escapes through the chimney in singed condition.
Suggested quantity of asteroids in kg per turbocharger or per gas inlet and the number and size of containers required in each case.
* For these types of turbochargers not all the gas inlets specified in this table are available.
NOTE: If the solid bodies are blown in before the protection grid, the quantity of solids can be increased
by 10 to 20%.
TECO Asteroids are produced from hard shells of fruit stones that have been stabilized by drying and
degreasing. Ligneous residues and foreign matter such as mineral or metallic particles are eliminated.
TECO Asteroids are the result of many years of practical experience in blending the raw material to
achieve a highly homogeneous and efficient product. No chemicals are used in our production process.
The raw materials are only treated mechanically. Hence the use of asteroids is perfectly safe and
harmless. TECO Asteroids are now produced with improved particle size tolerance of 1.3 to 1.7 mm diameter.
Suggested Cleaning with TECO Marine Asteroids:
TECO Asteroids are available in bags of 25kg.