Automated air preheater and gas-gas heater cleaning service
Hydrotech’s industrial cleaning team operates fast and independently, almost every aspect of the job is taken care off by our team. In many cases thermal efficiency has been restored to a level not seen since the initial element installation. Cleans are typically completed within a 48 hr plant shut down. Cleaning time is between 12hrs and 36hrs depending on size of Air preheater or Gas gas heater.
The Hydrotech® automated Air Preheater and Gas-gas heater Cleaning Process
High pressure water jets (300 – 500 bar at 15m³/hour flow per side) will traverse across the element packs, moving into the centre at a pre-set index (usually 1 cm) after every complete revolution of the elements. The speed of the rotation of the elements will be adjusted according to the degree of fouling. Normally, the elements will rotate more quickly as the jets approach the centre, although as the process is continually monitored, the Hydrotech operative will pay particular attention to any problems areas within the preheater matrix. The entire process is, however, fully automated, so no engineer is required to be inside the air preheater during the clean.
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Normally air preheaters and gas–gas heaters are cleaned from one side, and can be cleaned simultaneously or consecutively. Simultaneous washing means that a pair of air preheaters can be cleaned within a 48 hr plant shut down. In some cases depending in the depth, element type and fouling an above and underneath clean is required; normally 90% of air preheaters are cleaned with a one side only wash.
The effluent creation will be c 15m³ per hour maximum per preheater for a ‘one side ‘wash (double for a two side wash). However we can speed up the clean, providing we are achieving good cleaning results to keep the total amount of effluent created to a minimum.
Air Preheater Cleaning Guarantee
Hydrotech Systems guarantee the automated air preheater cleaning service. The most reliable meausre of effectiveness of the cleaning service is the flue gas draight loss measurements before and after the cleaning service at equivalent operating conditions. In some cases the draught loss has been restored to the level when the current elements were new.
The air preheater guarantee is available upon request.
Hydrotech service includes
Hydrotech 24 hour fully automated cleaning service includes