Exhaust Gas Boiler · Boilers
The Alfa Laval S.p.A. Aalborg-XW-TG-3-7bar is a forced-circulation water-tube exhaust gas economizer in the Aalborg XW-TG waste-heat-recovery family. It is installed downstream of a large diesel engine and recovers exhaust energy that would otherwise be discharged through the funnel. The XW-TG concept is derived from the Aalborg XW design with gilled water tubes and is intended for installations that generate superheated steam for a steam-turbine-driven generator. The unit therefore forms part of a wider waste-heat-recovery plant that includes circulation equipment, steam separation and the associated control and protection systems. The 7bar suffix identifies this pressure-labelled variant of Aalborg-XW-TG-3; exact pressure, temperature and steam conditions must be taken from the manufacturer documentation. Because the unit works with high heat-recovery rates, cleanliness, stable forced circulation and correct control of steam conditions are particularly important.
What our service work and the manufacturer documentation say about keeping this model running.
Inspect heating surfaces for soot, oil contamination and corrosion and trend exhaust-gas pressure drop where available. Verify circulation-pump redundancy, valve alignment and all relevant low-flow or temperature protection. Examine accessible tubes, headers, casing, supports and expansion arrangements for leakage or fatigue damage. Review steam and water chemistry records and investigate any abnormal make-up-water demand. Test relevant pressure, temperature, flow and steam-condition instrumentation and alarms. Survey work should also consider the interfaces with the steam drum, superheated-steam system and turbo-generator. Use manufacturer documentation for exact limits and test procedures.
Carry circulation-pump service parts, valve and actuator kits, suitable gaskets and sealing materials, and critical pressure, temperature and flow instrumentation spares. Keep wear parts and consumables for the soot-cleaning system. For installations where downtime of the waste-heat plant affects electrical generation, the spare strategy should also cover critical control components and any manufacturer-approved tube-repair materials.
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