International Journal for Electricity and Heat Generation Automatic Quality Assurance of On-line Water-Steam Cycle Analysis as Part of the Ensdorf Power Plant Renovation Process Dr. Thomas Brück, VSE AG, Kraftwerk, DE-66806 Ensdorf Pedro Isliker, SWAN Systeme AG, CH-8340 Hinwil

Automatic Quality Assurance of the Water-steam Cycle Automatic Quality Assurance of On-line Water-Steam Cycle Analysis as Part of the Ensdorf Power Plant Renovation Process Thomas Brück and Pedro Isliker Kurzfassung Automatische Qualitätssicherung der On-line Analyse im Wasser-DampfKreislauf am Beispiel einer Anlagenerneuerung im Kraftwerk Ensdorf Die Anforderungen an analytische Systeme sind in den vergangenen Jahren erheblich gestiegen. Dadurch hat sich die Qualitätssicherung vor allem in den Bereichen Auswertung, Überwachung, Hardware-Überprüfung und Signal-Übertragung erheblich weiterentwickelt....

Automatic Quality Assurance of the Water-steam Cycle Sensor defective Figure 2. Automatic measurement check by the oxygen sensor. effort was of course not considered by the existing staff plan. A further problem frequently occurring was the appearance of iron particles during unit starts. In this plant operating state, which is always stressing for the operating team, the necessary efforts caused by the sampling equipment was even greater than in normal operation. Manual blow-down of the sampling lines became necessary in order to assure a flow rate in the course of the measurement. Figure 1....

Automatic Quality Assurance of the Water-steam Cycle Figure 3. Schematic of cooling water system. – primary side cooling: well water at 15 °C – secondary side cooling: Condensate – sample outlet to making up of the condensate cooling cycle tection valve and a backpressure regulator. The temperature protection valve shuts down the sample flow if the temperatures are too high. The backpressure regulator generates a constant flow rate and thus damps out any process oscillations. The downstream conductivity measurement unit provides monitoring functions such as sample flow monitoring, calculation...

Automatic Quality Assurance of the Water-steam Cycle in this operating state, the blow-down function has been automated. By a signal from the plant control system (PCS) during the start-up procedure, the live steam sampling facility is purged for several minutes, independent of operator’s action. System features: –– one motor valve in each case for the blowdown and sampling functions, designed for maximum pressure and temperature (210 bar and 540 °C), –– remote control by a purging command from the PCS, –– positions of the valves are recorded, transferred, displayed and monitored. Sample Cooling...

Automatic Quality Assurance of the Water-steam Cycle –– electronics temperature, –– calibration data, Control room PP main computer –– verification data, Computer in laboratory –– alarm in the event of lack of reagents, –– alarm in the event of resin saturation, –– details concerning maintenance of the equipment ( F i g u r e 6 ). Visualisation system TCP/IPinterface Profibusinterface Analytical instruments Figure 6. Special feature: Digital pre-processing of measured data. In AQAS the data can be both visualised and also transferred to other systems. This facility is used in order to make the...