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Return Condensate Water Monitoring
ODS delivers complete on-line analyser systems to monitor the quality of condensate return water. We offer single stream or multi-stream analyser systems. Cogenerators and power plants use steam to generate electricity via turbines and gas motors. As a by-product the steam or hot water is exported to near by plants. Via heat exchangers the energy from the steam / hot water is used for all kind of processes. The condensate water is expensive since it contains a lot of heat / thermal energy. Therefore it is returned to the cogenerator/power plant to be reused as boiler feed water. It is common practice that the quality of the condensate water is monitored via fast TOC- or TC-analyser systems, pH and conductivity analysers and silica analysers. Heat exchangers in factories will corrode causing a great risk that they start to leak. Contamination of the condensate return water with hydro carbons or other components is a big risk causing pit corrosion of piping and especially attacking the boiler installation.
Condensate return water monitoring system should:
- Alarm as fast as possible when the condensate water starts to be contaminated. The faster the TOC-alarm will be generated, the faster the contaminated water can be flushed to drain.
- Return to “low TOC-readings” after the event as fast as possible. Memory effects should be as less as possible. The phenomena “memory” is caused by ad- and absorption effects. In general low concentrations of hydrocarbons/components are very hard to transport via sample lines to the process analyzer. The components will be absorbed, adsorbed and desorbed to all wetted parts. This could result in memory effects causing the analyser to read still high values when actually the quality of condensate water is within specifications. A good designed analyser system reduces these memory effects.
- Have no problems with “carry over”. Especially when using multi-stream analyser systems the effect of “carry over” should be as little as possible. Carry over is caused by analytical memory effects in the analyser itself. Using a sequencer, the analyser “hart” have to measure different TOC-concentrations. Carry over means that the TOC results are influenced by the TOC-levels of the seprate strreams being sequential samples. ODS has experience up to 7-stream TOC-analyser systems. Carry over effects where very minor.
- Availability. The analyser systems availability should be as high as possible. It is a process measurement that saves money and so it is of great importance to have it continuously on-line.
- Easy and fast to validate. When a contamination has been detected the TOC-alarm will result in a process control step such as draining condensate water. Plant operators will be critical about the analyser performance. Questions: “Is the TOC-alarm from an incorrect analyser?” or “Our condensate water cannot be contaminated” ask for prove. An easy and fast to use calibration/validation tool is of great importance.
- Sample conditioning systems. The sample is normally hot (80 - 120 degree Celsius). The pressure can be high and fluctuating. Particles normally are present in the sample. These particles have an organic content and can result in “freak peaks” (TOC-spikes). ODS delivers custom made sample conditioning systems with multi-step particles filters, heat exchangers, pressure reducers etc.. We use heat exchangers with water or air cooling.
We have also installed many EEx-p systems, indoor and outdoor, in HAZARDOUS AREA’S such as ATEX zone 1 or 2.
We are pleased to offer you specific information:
Contact ODS or/and Send us your enquiry.
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