One Year Full-Scale Study Of Ozone Cooling Water Treatment At A German Electric Power Station

Abstract

This paper presents operating results of ozone treatment of the water in a cooling system with open loop recycling containing the following elements:

- Main cooling water pumps

- Cooling water storage tanks

- Distribution manifold to cooling water users

- Cooling water collecting basins

- Cooling water recycling pumps

- Cooling tower.

The system reviewed in this paper is the side cooling system of a heating power station in Germany, with a capacity of 1,000 m³/h (4,400 US gpm). Operation started in early 1989. The plant has been operating now for over two (2) years. During this period the following items were analyzed and evaluated:

- Ozone residual in the water

- Quality of the cooling water

- Organic scaling on equipment and piping

- Material corrosion behavior.

For the purpose of analyzing the corrosion behavior, two heat exchangers were installed, both identical and each fitted with tubes of different materials. One unit was in contact with ozone residual, while the other was exposed to water without ozone.

The results of this two year operation are extremely encouraging and the owner of the power plant decided to keep the ozone system operating for the future.

The following paper reviews the findings of the 2-year operation (1,2).

Key Words:

• Ozone
• Cooling Water
• Power Plant Cooling Water Treatment
• Scaling Control
• Corrosion Control