PROCESS ANALYTICS

Water Treatment Systems

Thermal power plants require large quantities of water and a viable drainage system for wastewater from the following processes:

Reverse osmosis (RO) concentrate and RO cleaning solutions
Wastewater from ion exchanger regeneration
Wastewater from cooling tower desalination and boiler cleaning
Wastewater from flue gas desulfurization and wet scrubbers
Overflow from ash ponds and coal deposits
Oily wastewater from oil storage tanks (oil-fueled power plants)

Key Facts About the Application

Sector

Water treatment of wastewater from various processes

Applications

4 applications (1. Checking pH value, 2. Checking dissolved oxygen (DO), 3. Checking pH value, 4. Checking pH value and ORP) at multiple measuring loops

Measured Parameters

pH, conductivity, and ORP

Main Requirements

High proportion of foreign matter that must be removed as solids

Regulatory provisions that apply to the disposal of wastewater

Measurement in Wastewater and Ash Slurry

Description of application

In the following, we describe the typical process steps and measuring loops in the pre-treatment of wastewater and final control of the water discharged into the environment.

Application 1:
The wastewater from the power plant is guided into the sedimentation tank and neutralized there with lime. This process creates large quantities of deposits over time.

Application 2:
After neutralization, the wastewater is treated with microorganisms in an aeration tank. Dissolved oxygen is measured in order to monitor ventilation.

Application 3:
The water that leaves the treatment plant must have a pH value between 6.5 and 7.5 in order to comply with environmental requirements.

Application 4:
The pH value and redox potential of the water in the ash tank must be inside a specific range to comply with environmental requirements.

Requirements for the application

The high proportion of solids in the water is a challenge for pH sensors, which can easily clog.
For the disposal or emission of wastewater, the applicable legal limit values must be monitored and documented.

Why Knick?
Wastewater normally contains suspended matter – we offer sensors for these demanding conditions and sensor maintenance systems for automatic cleaning. Further, Memosens technology enables interference-free measurement even in dirty and moist environments and across great distances.

Associated Products

SE571 pH Sensor | Memosens | 120 mm | Ex | For demanding applications in the chemical industry

Product number:

SE571X/1-NMSN

SE740 Optical Oxygen Sensor | M12 (8 pins) | 425 mm | For demanding hygienic environments

Product number:

SE740/4

SE555 pH Sensor | VP | 120 mm | Ex | Sterilizable | For aggressive media

Product number:

SE555X/1-NVPN

SE564 ORP Sensor | Coax (S8) | 120 mm | Ex | For highly contaminated media with pressure fluctuations

Product number:

SE564X/1-NS8N

SE554 pH Sensor | VP | 425 mm | Ex | For very high ionic strength media

Product number:

SE554X/4-NVPN

ARD50 Immersion Fitting | Modular | PP-H or PVDF | One Sensor

Product number:

ARD50

ARD75 Immersion Fitting | Modular | PP-H or PVDF | Up to three sensors

Product number:

ARD75

Stratos Multi E461N Multiparameter Transmitter | Memosens/Analog Sensors | 2-Channel | PROFINET | 2x 4…20 mA Outputs

Product number:

E461N.010

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.

Boiler Feed Water Circuits

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

Cooling Water Systems

Measurement of pH value, redox potential, and conductivity in cooling water, which has to be continuously treated with acid and biocides.

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.

Energy Industry Brochure

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

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