Deaerator Retrofits, Upgrades and Services
Besides the delivery of new deaerators, Stork Thermeq also serves their clients by retrofitting traytype deaerators into the Stork Spray Type deaerator.
The reason for retrofitting the existing deaerator can be:
- Increasing the capacity of the deaerator due to an increased demand for boiler feed water;
- High operating and maintenance costs due to high steam losses and frequent damage to the internals;
- Unsatisfactory deaerator performance (highO2).
The retrofit can be planned within a few days, including changes to the steam and condensate piping. The work can be done under supervision of Stork in cooperation with local companies.
Work
In most cases, a tray-type deaerator is made up of two main parts, the horizontal storage tank with on top of it the actual deaerator. The Stork SprayType Deaerator has the deaerating and storage function integrated into one vessel. When a tray-type deaerator is retrofitted, only the storage vessel is reused.
The retrofit mainly consists of:
- Removal of the tray-type deaerator vessel;
- Mounting of the Stork condensate sprayer (for pre-deaeration);
- Installation of internals (steam distribution pipes) into tank (for final deaeration).
Depending on the situation at hand, the installation of the internals can be done in different ways. The internals can be brought inside the deaerator through the manhole in parts and welded together inside the deaerator. In other cases, one vessel head is completely removed and the internals are taken inside the deaerator completely prefabricated. Afterwards the vessel head is welded back on the deaerator.
Project
The pictures below give an impression of a retrofit carried out at a paper mill of Södra Cell in Sweden.
Tray-type deaerator before the retrofit
After retrofit to Stork Spray-Type Deaerator
The installation of a new paper mill and consequently higher boiler feed water capacity, required a new deaerator or a retrofit of the storage vessel to a Stork Spray Type Deaerator.
As a retrofit was the most favourable solution both looking at investment and delivery time, the client choose for a retrofit. The capacity of the deaerator was increased with approximately 50 %.
The complete retrofit including engineering and prefabrication took 2 months. The actual work on the deaerator was done in 5 days during a scheduled 2 week stop.
References
Stork Thermeq has retrofitted a number of deaerators as listed below:
Company
|
Location
|
Country
|
| Purac |
Tiel |
The Netherlands |
| Akzo-Nobel |
Hengelo |
The Netherlands |
| Södra Cell |
Väröbruk |
Sweden |
| TOT 1 |
Otrokovice |
Czeck Rep. |
| Stora Enso |
Hyltebruk |
Sweden |
| Hoogovens |
IJmuiden |
The Netherlands |
| Shell |
Moerdijk |
The Netherlands |
| TOT 2 |
Otrokovice |
Czeck Rep. |
| Parenco |
Renkum |
The Netherlands |
| M.REAL |
Tampere |
Finland |
| Arauco |
Constitución |
Chili |
Services
Stork Thermeq also has the capabilities to assist our clients with all kind of deaerator associated services.
These are for instance:
- Measurement of the O2 content at the deaerator to check the actual performance;
- Trouble shooting of deaerators and the surrounding steam- water system in case of operational problems;
- Engineering studies to assess the feasibility and possible consequences of proposed alterations in the operation of the deaerator and the surrounding steam- water system;
- Periodical deaerator mechanical inspections as required by local authorities.
Stork Thermeq specializes in tailormade design, production, construction and maintenance for combustion, deaeration, condensation and absorption refrigeration systems.
With its focus on production speed and flexibility, Stork Thermeq is also a leading supplier of high quality components for boilers and the process industry. We consider satisfied customers, motivated employees and high quality to be the core values for the successful continuity of our company.