Closed loop filtration and polishing system for the ACC flushing.

The Client’s Needs
Veolia received a request from an engineering house to clean their steam lines prior to commissioning of the power plant using the process of Steam Blowing. The client was also using Air Cooled Condensers (ACC) which had become contaminated with debris during fabrication.
The client also requested a closed loop filtration and polishing system for the ACC flushing in addition to temporary Deionisation for the steam blows. Using a mobile solution ensured minimum wastage of water and a significant reduction in cost.

The Solution
Using Veolia’s MOFI, MODI and MOPS technologies the customers requirements could not only be met but exceeded:
Steam Blowing: When commissioning power plants it is essential that the steam lines are free from particulate matter to avoid damage to the steam turbines. This is achieved by conducting “steam blows” – where steam generated in the boilers, is allowed to escape to atmosphere at high flow rates and velocities – blowing the particulate out of the steam lines. This loss of steam is usually beyond the capabilities of the installed deionising plant to make-up, so it is common practice to use mobile deionising units.
Boiler Flush & Fill: The customer also uses air cooled condensers (ACC’s) which condense the steam exiting the steam turbines. Due to their delicate structure these needed to be flushed for 24 hours at a high flow rate. To minimise water and energy waste Veolia proposed a scheme of Skid Pumps and MOFI filters along with “standby units” to accommodate “swap-outs” as required which would have to be carried out without interrupting the flow through the system.

Benefits

  • Process Capacity: a continuous supply of 140 m³/h.
  • Service Expertise: Created a closed-loop filtration approach and polishing system for ACC flushing.
  • SE: Maintained stringent Health & Safety standards under extreme operating conditions (5 bar, 85*c) as presented by the closed – loop approach.
  • To Budget: Project finished within customer’s budget.