Water quality monitoring 24/7
Overcoming corrosion and scaling issues while ensuring the integrity of your water steam circuit
Water quality monitoring within power plants maintains the operational efficiency and minimizes plant downtime caused by corrosion and leakages. It also allows turbine supplier warranties to remain applicable. The integrity of the components is affected by the constant contact of the water and steam with metal surfaces, which creates corrosion and scaling. You need smart instrumentation for analysis, allowing you to prevent such situations and avoid expensive repairs.
SWAS - A standardized solution for sampling and analysis
The modular Steam and Water Analysis System (SWAS) provides all necessary measuring signals for process control. On an analysis rack (wet rack), the samples are first taken from the water steam circuit and conditioned (cooling, pressure reduction). The conditioned sample can be analyzed for various parameters such as pH, dissolved oxygen, silicate, sodium, total, acid and differential cation conductivity. It is modular, scalable and easy to retrofit which allows you to increase plant efficiency.
Suitable for use with Memosens digital technology for easy calibration, reliable measurement and user-friendly maintenance
One transmitter for all parameters possible with Liquiline multichannel controllers
Integrated logbook for water quality
Predictive maintenance with remaining cation capacity calculation
pH calculation via differential cation conductivity according VGB standard
Monitor pH value within the boiler to avoid system corrosion
The pH value varies depending on the location in the water steam circuit. There are two modes for pH conditioning depending on the existing materials in your plant: universal mode and alkaline mode. Nevertheless, it is common practice to keep the pH value of feed-water at slight alkaline levels to prevent corrosion. We support you with a unique pH electrode for ultrapure water and a salt ring for reliable measurement.
Precise monitoring of silica protects the turbine
An inadequate level of silica leads to a solid layer on the turbine blades, and cause abrasion and blockage of the turbine. Removing these silica parts with chemicals or mechanical processes can cost you valuable time and resources. Our analyzers offer you continuous monitoring at several points of the water steam cycle (e.g. high pressure and low pressure turbine steam, steam drum, CEP discharge, make-up water, drum water) which avoids costly delays in start-up and manual test sample batches.
Monitoring the dissolved oxygen (DO) to prevent corrosion
Oxygen should only be present in trace quantities (ppb) as it can result in corrosion damage to the components of the steam cycle. To minimize corrosion under alkaline operating conditions, mechanical de-aeration and chemical scavenger additives are used to remove the DO. Our Memosens technology for oxygen sensors combined with our Liquiline transmitter allows for reliable lab calibration, easy maintenance and minimal downtime of the measurement point.
Detect conductivity variations that create some scaling
The conductivity measurement indicates the quantity of dissolved solids that are present and how likely they are to create some scaling. Conductivity of pure water is almost zero and even a small addition of salt can increase corrosion dramatically. Thus, use the conductivity parameter to detect impurities caused by cooling water and air leakages. We offer a wide range of multi-parameter transmitters to fit to your needs. These transmitters from our Liquiline product line:
Are quick, easy to commission, easily expandable
Are based on Memosens digital sensor technology and have standardized and intuitive operation
Are compact or panel mounted for more simplicity
We believe in smart instrumentation that prevent you from expensive repairs and unnecessary downtime. The SWAS panels are designed with best-in-class instrumentation to keep the integrity of your water steam circuit safe at all times. All panels are easy to install, to commission and to operate and can be combined as desired thanks to their modular design.
is the increase of process uptime thanks to digital Memosens instruments installed on the panels
are additionally saved every 26 min by a typical 500MW combined cycle plant using degas conductivity analyzers
is the time saved when you integrate the panel into the process control system thanks to Liquiline transmitters