Measuring the pipe wall temperature in power stations

The application

Measuring the pipe wall temperature in power stations  

Measuring the pipe wall temperature in power stations

In the past, many conventional power stations in Germany were built to ensure base load stability. The increased integration of weather-dependent wind and photovoltaic systems is already leading to strong variations in feed-in that are dependent on load fluctuations.

Variations in feed-in dependent on load fluctuations

Load balancing before

Load balancing before

Load balancing today and in the future

Load balancing today and in the future

It is therefore increasingly necessary for base-load power stations to be able to cover not only full-load operation, but also low-load fluctuations with sometimes steep load gradients.

Coal-fired power stations were never designed for low-load operation. To ensure optimum firing and the even load on the system parts this entails, new methods of control are needed.

For example, the evaluation of pipe wall temperatures with up to 2,000 thermocouples at the boiler is an important indicator of constant firing and load on the boiler. By evaluating this information and forwarding it to the main automation system, the manager of the block-unit is provided with important parameters in the control room.

The solution

Distributed solution

Phoenix Contact does not just offer all the necessary components for the distributed collection of measuring points using Ni-CrNi thermocouples; it can, if required, also supply pre-assembled and ready-to-use I/O stations equipped according to your requirements. These I/O stations are used to provide signals directly to the main automation system via PROFIBUS DP, and they can be installed immediately in the field. All the relevant ambient conditions, such as temperatures up to around 60°C, have been taken into consideration in the optimized control cabinet design.

Decentral solution  

Example: Measured value acquisition via distributed control boxes

The distributed I/O stations consist of:

  • 24 V redundancy module for the redundant
    supply of the I/O station
  • Separate protection of the stations via
    device circuit breakers with PT connection technology
  • Bus couplers for PROFIBUS DP with
    temperature measurement terminals
    (type UTH) with internal cold junction that support modular expansion
  • FO converters for forwarding data via
    fiber optic cables (if required)

Central solution

In addition to components, Phoenix Contact also offers a complete solution for rebuilding central stations. All measured values are acquired in the pre-assembled, pre-wired, ready-to-use central cabinets, and mean values are generated and sent to the main automation system.

For example, the new central cabinets consist of:

  • Bus couplers for PROFIBUS DP with temperature measurement terminals (type UTH)
    with internal cold junction
  • Bus couplers for PROFIBUS DP and temperature measurement terminals (type RTD)
    for recording compensation measurement via PT100
  • Separate supply of the PROFIBUS stations via 24 V power supplies
  • Separate protection of the stations via device circuit breakers with PT connection technology
  • Central controller for evaluating measurements and forwarding them to the main automation system
  • On-site visualization via operator panel with touch screen display and visualization software
  • Industrial firewall/router for secure communication via the Internet
Central HR solution

Example: measured value acquisition via central cabinets

Your advantages at a glance

  • Easy and straightforward overall installation
  • Low installation costs, thanks to ready-for-assembly I/O stations and central cabinets
  • Cabling effort saved with the distributed solution
  • Accurate measured values, thanks to cold junction compensation in the field
  • Fast, digital transmission of individual values as far as the main automation system

Phoenix Contact UAB

Svitrigailos str. 11B
03228 Vilnius
+370 5 210 6321

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