Cooling Water Systems
Measuring in Cooling Water
In a thermal power plant, an effective cooling system is needed to transform the used steam after turbine into liquid condensate (condenser). A complex chemical water treatment is required for cost-effective operation of the cooling system. Cooling towers are expensive in investment and running cost and need to be maintained properly in order to avoid costly shutdowns of the complete power plant. The main problems are scaling, corrosion and biological growth from algae and bacteria.
Power Plants operating Combined Cycle Mode
Sector
3 Applications (1. Checking dissolved Oxygen DO, 2. Checking pH and Conductivity, 3. Checking Conductivity) at several measuring locations
Application
pH, Cond and ORP
Measured Parameter
Key Requirements
- Scaling, corrosion and biological growth from algae and bacteria.
- Acid and biocides in the medium
Application Description
Application 1:
Acid is added to dissolve carbonates before they can block the system, controlled by pH measurement.
Application 2:
A biocide (e.g. hypochlorite) is added to prevent algae and bacteria growth which will block the system, controlled by an ORP measurement.
Application 3:
From time to time, a „blowdown“ needs to be performed. Highly contaminated cooling water will be replaced by clean water to reduce the concentration of the chemicals, controlled by a conductivity measurement.
By using Knick contactless and inductive Memosens technology, many maintenance problems resulting from humidity and corrosion can be avoided. Remote calibration of sensors in laboratory and simply swap sensors at side will help to the operators to run the system smoothly without difficult and time consuming on site calibration.
Requirements of Application
- Scaling, corrosion and biological growth from algae and bacteria.
- Acid and biocides in the medium
Why Knick ?
Knick offers an extensive modular system for fittings with highly resistant materials against corrosion and suitable sensors for these demanding conditions. Multipurpose use of Stratos Multi, allows different parameters to be monitored with the same equipment.
Solution - Product Highlight
Features
- Dual channel any parameter
- Advanced diagnostics
- Memosens technology
- Namur status indications
- Hart, ProfiNet and EtherNet/IP communication options
Customer Benefit
- Small footprint due to double channel, split display
- Sensor diagnostics and alarm indication and transmission
Features
- Up to 135 °C, up to 6 bar
- Ceramic junction
- Viscous gel filling
- For aggressive media
- Memosens technology
Customer Benefit
- Long lifetime even in harsh conditions
- Remote calibration
- Sensor/cable connection can be submerged in water (Memosens)
Features
- Manually operated retractable fitting for various sensor types
- 100 % sealed against process medium in any position of movement
- Various materials and process connections available
Customer Benefit
- Cleaning, calibration and change of sensor without process interruption
- Highest safety due to special interlocking mechanism