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3. Removing contaminants from Ljüngström air/fume heaters (ROPP, ROSS) in boilers.

The aim of this technology is to remove any impurities from spaces between heating sheets of exchanger baskets causing the exchanger's deteriorated operating parameters.

Cleaning Technology.

In this operation, high-pressure (P = 35 MPa) water is sprayed onto internal spaces between sheet packs of exchanger baskets. A stream of water coming out of nozzles loosens, crushes and washes out deposits outside the exchanger, thus washing it out completely and original operating parameters are regained.

For this purpose, bearing beams with driving cars where nozzle sets are mounted are installed radially, inside the flue pipe on both sides of the rotor (from the top and bottom). In cleaning, the exchanger drive is controlled with an inverter whose task is to maintain the rotor's required rotational speed. The duct sets are supplied with a high-pressure plunger pump with a diesel engine.

The measurable advantages of cleaning rotational air/fume heaters:

• the highest surface cleaning class compared with other cleaning methods,
• no work-consuming dismantling and re-installation of heating baskets is required,
• no adverse environmental impact by eliminating moistening (corrosion) and secondary cleaning of buildings and boiler-house equipment (silting),
• short execution time (LUVO up to 24 h ; REGAVO 48 to 56 h).