PROCESS ANALYTICS

Cooling Water Systems

Thermal power plants require an effective cooling system in order to convert the used steam into liquid condensate downstream of the turbine (condenser). To operate the cooling system affordably, complex chemical water treatment is required. Cooling towers eat up plant and operating costs and require intensive maintenance in order to avoid expensive downtime for the entire power plant. The main difficulties are scaling, corrosion, and the biological growth of algae and bacteria.

Energy

Key Facts About the Application

Sector

Power plants in combined cycle operation

Application

3 applications (1. Checking the dissolved oxygen (DO), 2. Checking the pH value and conductivity, 3. Checking conductivity) at multiple measuring loops

Measured Parameters

pH, conductivity, and ORP

Main Requirements

Boiler scale formation, corrosion, and biological growth from algae and bacteria.

Acid and biocides in the medium.

Measuring in Cooling Water

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 extendable modular fitting system with extremely corrosion-proof materials and matching sensors for demanding conditions. With multi-faceted Stratos Multi industrial transmitters, different parameters can be monitored using one device.

Associated Products

SE555 pH Sensor | VP | 325 mm | Ex | Sterilizable | For aggressive media

Product number:

SE555X/3-NVPN

WA130 SensoGate Retractable Fitting | Modular | Pneumatic | For Uniclean and Unical

Product number:

WA130

Stratos Multi E401N Multiparameter Transmitter | Memosens/Analog Sensors | 1-Channel | 2x 4…20 mA Outputs

Product number:

E401N

Associated Industries and Applications

Energy

In power plants, water is used in many processes with completely different requirements: for example, for steam generation, cooling, and flue gas scrubbing.

Ion Exchanger Systems

Measurement of pH values, dissolved oxygen, and conductivity in boiler feed water, steam, and condensate in combined gas turbines in power plants.

Monitoring Steam Generators

Since steam generators fulfill application-critical functions and the cost of their downtime or replacement is extremely high, damage caused by wear should be prevented by monitoring water quality.

Flue Gas Desulfurization

pH value measurement in the pre-scrubber, the neutralization phase, and the lime scrubber as part of the flue gas desulfurization process in power plants.

Combined Cycle Power Plants

Measurement of pH values, dissolved oxygen, and conductivity in boiler feed water, steam, and condensate in combined gas turbines in power plants.

Boiler Feed Water Circuits

Measurement of pH values, dissolved oxygen, and conductivity as key parameters in the boiler feed water circuit.

Water Treatment Systems

Measurement of pH value, dissolved oxygen, and redox potential in various applications during the water treatment process of power plant wastewater.

Reverse Osmosis Systems

Reverse osmosis systems are used for water treatment in a wide range of industrial applications. The main application is industrial saltwater desalination.

Energy Industry Brochure

Overview of specific applications and product solutions in different areas of power plants.

Latest Blog Post

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