Introduction
A major power company in the Southeast decided to replace its hydrogen gas detection system. The current system was unsupported by the manufacturer and failing. The new system would need to duplicate the functionality of the old to minimize the training and impact on the operators. Yokogawa was asked to facilitate the project.
Application
Many power stations use hydrogen to help cool their turbines. Hydrogen has a better heat transfer coefficient than air, but also the drawback of being explosive when mixed with oxygen. Cooling turbines this way calls for a hydrogen gas detection and alarming system. A new hydrogen gas detection system is what the client requested. The new system needed to be able to work in three modes - % Hydrogen in air, % Hydrogen in Carbon Dioxide and % Air in Carbon Dioxide. The system would need to clearly indicate which stage of measurement it was displaying as well as trending and alarming on certain levels.
Solution
Yokogawa's DX Advanced and GD402 was the solution for the hydrogen gas detection system. The GD402 senses the % Hydrogen while providing feedback on which mode it is in (Hydrogen in Air, Hydrogen in Carbon Dioxide or Air in Carbon Dioxide). The GD402's information is relayed back to the DX Advanced via analog and discrete inputs where it is converted into trends and digital indications. The DX Advanced uses its math logic capabilities to efficiently translate the GD402's signals to switch detection modes and ensure the operator is always seeing the correct reading. Once the signals enter the DX Advanced all of its capabilities including alarming, data logging and network connectivity become available to the power station. Yokogawa's DXAdvanced and GD402 is now a proven replacement for L&N's failing systems; Yokogawa's system can quickly be deployed at new facilities with very little engineering effort.
Logic Table
Relay 1 | Relay 2 | DX1004 | Display changes | |
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H Purity | 0 | 0 | H purity | AO1 from GD402 1 to 5 VDC scale 85 to 100% H |
Mode Replacement | 1 | 0 | CO2 to Air | AO2 from GD402 1 to 5 VDC scale 0 to 100% CO2 |
Mode Replacement | 1 | 1 | H to CO2 | AO2 from GD402 1 to 5 VDC scale 0 to 100% CO2 |
Relay 1 terminal 20 - 21 NO contact Relay 1 terminal 22 - 22 NO contact |
Industries
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Power
In the mid 1970s, Yokogawa entered the power business with the release of the EBS Electric Control System. Since then, Yokogawa has steadfastly continued with the development of our technologies and capabilities for providing the best services and solutions to our customers worldwide.
Yokogawa has operated the global power solutions network to play a more active role in the dynamic global power market. This has allowed closer teamwork within Yokogawa, bringing together our global resources and industry know-how. Yokogawa's power industry experts work together to bring each customer the solution that best suits their sophisticated requirements.
Related Products & Solutions
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Button Operated DX1000/DX2000
The Daqstation DX1000/2000 series is a data acquisition system with display. Its HMI supports custom graphics for industry applications, audit trail and advanced security conforming to FDA 21CFR Part 11.
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GD402/GD40 Gas Density Analyzer
The GD402 gas density analyzer and GD40 gas density detector provide continuous measurement of gas density as well as other valuable parameters, including specific gravity and percent concentration.
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Gas Density/Hydrogen Purity Analyzer
Depend on accurate and continuous measurements
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Paperless Recorders
- Portable paperless recorders
- Fully integrated data acquisition and display stations
- Secure, built-in data storage and network connectivity
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