PROCESS ANALYTICS

Combined cycle gas turbine

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.

Energy

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.

Matching Products

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

Product number:

A1401N-P1-21

SE740 Optical Oxygen Sensor | M12 (8 pins) | 425 mm | For demanding hygienic environments

Product number:

SE740/4

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

Product number:

SE558X/1-NVPN

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

Product number:

SE604

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

Product number:

ARF200

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

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Power Industry Brochure

Overview of energy-specific applications and product solutions

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