ANALYSE DES PROCESSUS

Surveillance des générateurs de vapeur

Monitoring Steam Generators

Steam generators play a leading role in a variety of processes: They supply generators or turbines for power generation, drive steam engines, provide energy in thermal power stations and are used in heat-consuming processing the chemicals and metal industry.

Since steam generator functions are critical to applications and their downtime or replacement is extremely cost intensive, it is important to avoid damage due to wear by properly monitoring the water quality. The system is exposed to risks from:

Contamination of pipelines with biological or mineral substances that adversely affect the system’s efficiency
Corrosion of system components, that can shorten their service life and become hazardous for personnel
Inadequate condensate monitoring, which leads to a higher number of blowdown processes and inefficient water, chemical and energy consumption.

Chimie

Énergie

Monitoring water quality assures steam generator performance

The heating pipes of steam generators are a special concern. Normally, steam generators are supplied with alkaline water that helps a thin oxide layer to form on heating pipe surfaces to protect against corrosion. Sodium phosphate and sodium hydroxide, for example, are added to the water to make it more alkaline. However, since too much of these substances can lead to problems, the dosage should be based on the precise monitoring of pH measurement.

Knick developed the SE558 sensor for high-precision pH measurement in liquids with extremely low ion activity. It is typically used in ultrapure water applications and for water treatment for power generation.

Oxygen is highly corrosive: even minimal concentrations in the ppm range can corrode metal surfaces. This property has a significant influence on the service life of steam generators. This is why chemicals such as hydrazine are used to bond oxygen radicals.

The SE707 sensor measures dissolved oxygen up to the range of the detection limit in traces of 1 ppb, allowing adequate hydrazine dosage. Defective heating pipes or overdosing of chemicals lead to concentrations of harmful substances in water that can be detected by measuring the conductivity.

Rising conductivity indicates an increase in the contamination level of the water, which must be countered by blowdown or a system inspection if necessary. For the precise, reliable measurement of low and ultra low conductivity in ultrapure, cooling and boiler feedwater, as well as steam circuits, Knick developed the SE604 Memosens sensor with robust stainless steel electrodes in coaxial arrangement. Like all Memosens sensors, the SE604 has an integrated temperature detector for precise temperature compensation.

Since the connections of conventional analog sensors are not waterproof, analog product manufacturers encapsulate the cable in the sensor. As a result, users must remove the cable at the transmitter when replacing sensors. Memosens sensors feature contactless, 100% moisture-resistant measured value transmission, eliminating that effort. Thanks to inductive measured value transmission in the Memosens sensor coupling, neither moisture nor deposits can adversely affect transmission.

And digital Memosens technology permits sensor pre-calibration under ideal conditions in the laboratory: even untrained personnel can replace these sensors on site. The cell constants are automatically transmitted to the transmitter, remaining available for further calibration procedures.

Return on Investment

With Memosens sensors and transmitters from Knick, you will reduce the calibration cycles you require and increase sensor service life. Since Memosens sensors do not need to be re-calibrated or replaced as frequently, they will significantly reduce your measuring loop maintenance and new sensor procurement costs.
And for applications with high moisture volumes in particular, you will benefit from simplified sensor handling. Memosens sensors feature inductive transmission of data and supply voltage, and thanks to the high degree of protection of the transmitter, you no longer need to worry about wet or corroded contact points or effects that will harm the electronics. Knick provides a three-year warranty on the transmitters.

Produits correspondants

SE707 Oxygen Sensor | Memosens | 120 mm | Ex | Measuring range (resolution) 0 ... 50 mg/l (1 μg/l)

Réf. produit :

SE707X/1-NMSN

SE558 pH Sensor | Memosens | 120 mm | Ex | For ultrapure water, water and analytical chemistry

Réf. produit :

SE558X/1-NMSN

SE604 2-Electrode Conductivity Sensor | Memosens | Ex | Measuring range from ultrapure water to 500 μS/cm

Réf. produit :

SE604X-MS

Industries et applications connexes

Énergie

Les centrales électriques utilisent l’eau dans de nombreux process aux exigences très différentes, p. ex. pour la production de vapeur, le refroidissement et l’épuration des fumées.

Chimie

L’industrie chimique est caractérisée par une très grande diversité d’applications, qui incluent souvent des zones toxiques et à risque d’explosion.

Systèmes d’échange d’ions

Mesure du pH, de l’oxygène dissous et de la conductivité dans l’eau d’alimentation de chaudière, la vapeur et le condensat dans les turbines à gaz des centrales électriques à cycle combiné.

Circuits d’eau d’alimentation de chaudière

Mesure du pH, de l’oxygène dissous et de la conductivité : des paramètres essentiels dans un circuit d’eau d’alimentation de chaudière.

Systèmes d’eau de refroidissement

Mesure du pH, du potentiel redox et de la conductivité de l’eau de refroidissement, qui doit continuellement être traitée avec des acides et des biocides.

Désulfuration des fumées

Measuring of pH in pre-Scrubber, in neutralization and in lime scrubber within the flue gas desulfurization process in power plants.

Centrale électrique à cycle combiné

Measuring of pH, dissolved oxygen and conductivity in boiler feed water, steam and condensate in combined cycle gas turbine in power plants.

Systèmes de traitement de l’eau

Measuring of pH, dissolved oxygen and ORP in different applications while Water Treatment process of Power Plants’ Wastewater.

Production de cellulose et de papier

Dans le cadre de la production de cellulose, de nombreux postes de mesure sont placés dans des environnements où le temps de présence du personnel technique doit être limité au strict minimum.

Détection de rupture des échangeurs de chaleur

Les échangeurs de chaleur sont utilisés là où les fluides de process liquides doivent être refroidis et/ou la chaleur dégagée doit être récupérée pour d’autres process.

Mesures du pH lors de la synthèse de colorants azoïques

En raison de leur nombre, les colorants azoïques constituent le principal groupe de colorants synthétiques. Ils sont utilisés comme colorants alimentaires, peintures, teintes de base pour la quadrichromie (jaune et magenta) ainsi que très souvent comme teintures textiles.

Surveillance des tours de refroidissement

Les tours de refroidissement sont utilisées dans de multiples secteurs industriels pour évacuer la chaleur industrielle des circuits de refroidissement. Les dépôts minéraux et la corrosion diminuent l’efficacité et conduisent à l’usure prématurée des composants des installations.

Systèmes d’osmose inverse

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

Power Industry Brochure

Overview of specific applications and product solutions in various fields of power plants.

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