"> Alfa Laval S.p.A. Aalborg-XW-TG-3-20bar
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Alfa Laval S.p.A.

Aalborg-XW-TG-3-20bar

The Alfa Laval S.p.A. Aalborg-XW-TG-3-20bar 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 20bar 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.

Alfa Laval S.p.A. Aalborg-XW-TG-3-20bar

Components & Design

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Technical Data

Model number Aalborg-XW-TG-3-20bar
Evaporation 2000 kg/h
Design pressure 20 bar
Weight (dry) 4200 kg
Application exhaust gas economizer, container-mounted
Heating surface 45 m2
Standards EU PED 2014/68/EU, classification by IACS members
Design pressure (configured) 20 bar
Pressure grade 20bar

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Common failures & inspection points

●Gas-side fouling caused by soot or oily combustion deposits, indicated by loss of heat-recovery performance or increased exhaust-gas pressure drop
●Loss or reduction of forced circulation caused by pump, valve or piping faults, indicated by abnormal metal or fluid temperatures and unstable steam generation
●Tube leakage caused by corrosion, erosion or thermal fatigue, indicated by water loss or moisture in the exhaust path
●Water-side deposits caused by unsuitable boiler-water chemistry, indicated by reduced heat transfer or overheating
●Superheat or steam-condition control problems caused by sensor, flow or control faults, indicated by unstable steam temperature or turbine-generator operating restrictions
●Expansion-joint or casing deterioration caused by thermal cycling and exhaust vibration, indicated by gas leakage, cracking or abnormal movement

Service & Maintenance

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.

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Replacement Parts

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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Equipment Model #153573 · ✓ still in production