ANALYSE DES PROCESSUS

Centrale électrique à cycle combiné

Combined Cycle Gas Turbine (CCGT)

Many modern power plants are operated in the combined cycle mode. In the first step, a gas turbine produces electricity. The hot off gas from the gas turbine is fed into a conventional thermal boiler system with another steam turbine, resulting in a very good overall efficiency. In the above schematic, the measuring locations for pH, Cond and DO are highlighted.

Énergie

Keyfacts Application

Sector

Power Plants operating Combined Cycle Mode

Application

3 Applications:

Checking dissolved Oxygen DO
Checking pH and Conductivity
Checking Conductivity) at several measuring locations

Measured Parameter

pH, Cond and DO

Key Requirements

Measurements in difficult and narrow measuring ranges are necessary to prevent

deposits in the steam circuit,
damage to the piping system and the turbine/rotor and
the formation of biofilms.

Measuring in Boiler Feed Water, Steam and Condensate

Application Description

Monitoring of Boiler Feedwater Limits according to EPRI (Electric Power Research Institute/USA), ASME (American Society of Mechanical Engineers/USA), NEM (NEM Energy (Siemens)/The Netherlands), VGB (German organization of power plant operators) and TÜV (German technical approval organization) Guidelines.

Requirements of the application

In this process, conductivity must be monitored in a very low measuring range, which places the highest demands on the measurement technology. The pH values must be monitored within a very narrow value range. Dissolved oxygen is an important indicator for preventing corrosion in the circuit, which can cause considerable and extremely expensive property damage.

The measuring accuracy of all three parameters is therefore the decisive factor for efficient and damage-free operation.

Why Knick ?
Due to many years of experience in process analysis in the energy industry and a wide range of suitable products, such as flow-through fittings, compact transmitters for DIN-Rail and multi-purpose use of the same equipment, Knick is able to adapt simple and cost-effective solutions to the requirements of measuring points.

Produits correspondants

MemoRail A1401 Compact Multiparameter Transmitter | Memosens Sensors | Ex | 2x 4…20 mA Active Output | Broad-range power supply

Réf. produit :

A1401B-P1-21

SE740 Optical Oxygen Sensor | M12 (8 pins) | 215 mm | For demanding hygienic environments

Réf. produit :

SE740/2

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

Réf. produit :

SE558X/1-NVPN

SE604 2-Electrode Conductivity Sensor | 7-Pole | Measuring range from 1 nS/cm to 1000 μS/cm

Réf. produit :

SE604

ARF200 Flow-Through Fitting | Stainless steel or Hastelloy C22 | One sensor | Process connection via cutting ring coupling

Réf. produit :

ARF200

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.

Systèmes d’échange d’ions

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

Circuits d’eau d’alimentation de chaudière

L’eau d’alimentation de la chaudière est le fluide central pour toutes les turbines à vapeur. L’eau d’alimentation est préparée par un système d’osmose inverse et des échangeurs d’ions.

Systèmes d’eau de refroidissement

Cooling towers are used in a range of industrial sectors for diverting process heat from cooling circuits. Mineral deposits and corrosion reduce efficiency and lead to the premature wear of system components.

Surveillance des générateurs de vapeur

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...

Désulfuration des fumées

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

Power Industry Brochure

Overview of energy-specific applications and product solutions

Download now

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