Measurement and Testing
Hydrogen Cooled Generators
Dec 29 2017 Read 359 Times
Measurement of hydrogen purity is in a hydrogen-cooled generator during operation, start-up, and shutdown
Hydrogen is used as the cooling medium in electricity generators because of its high thermal conductivity. The hydrogen absorbs heat created in the generator and dissipates that heat as the hydrogen re-circulates through a compressor and dryer system outside the generator. Hydrogen is also used in generators is due to its very low viscosity. Hydrogen reduces the amount of wind resistance and friction on the spinning generator shaft, thus increasing the generator’s efficiency.
A reduction in hydrogen purity from 98 to 95% on a large generator can increase losses from friction and windage by up to 40%. Safety is another consideration. If air leaks into the generator, the gas can approach the upper explosive limit, possibly producing an explosion. Typically, the system is checked for leaks on a periodic basis at the generator and the tubing to and from the compressor and dryer.
The H2scan hand held HY-ALERTA™ 500 is Hydrogen specific. The response will not be compromised by other components in the gas stream. The portability allows checking at all locations of the generator including the bearing box, and the tubing running to and from the compressor/dryer. With a wide range of detection, the HY-ALERTA 500 is used to detect leaks from 15ppm to 100%.
HY-ALERTA™ 1600 is used to ensure a safe area surrounding the generator if the generator room is in a contained environment.
During start-up of a hydrogen-cooled electric generator, air in the generator is replaced with CO2. This step is taken first so hydrogen is never added to air possibly reaching the LEL. After the generator is filled with CO2 hydrogen is introduced until the generator is filled. With the hydrogen atmosphere intact, the generator can be started.
During shutdown, the hydrogen atmosphere in the generator is first displaced with CO2 and then the CO2 is displaced with Air. The Hydrogen level can be read during all phases of start-up, running, and shutdown.
Safe area monitoring in generator rooms
Hydrogen leaking into the area surrounding the hydrogen generator could make the containment room potentially explosive. HY-ALERTA™ 1600 installed in generator rooms will ensure safety operation of generators. Programmable alarms, relays and system integration are available options.
For further information or to place an order, please contact:
Gid Herman at GHerman@h2scan.com or (661) 775-9575 ext. 606
Do you like or dislike what you have read? Why not post a comment to tell others / the manufacturer and our Editor what you think. To leave comments please complete the form below. Providing the content is approved, your comment will be on screen in less than 24 hours. Leaving comments on product information and articles can assist with future editorial and article content. Post questions, thoughts or simply whether you like the content.
In This Issue... Articles - Industrial Applications of Offline and Online Comprehensive Gas Chromatography - Improving Workflow in Group-Type GC×GC Analysis of Petrochemicals - Identifi ca...
View all digital editions
May 13 2018 Riva del Garda, Italy
Jun 03 2018 San Diego, CA, USA
Jun 11 2018 Frankfurt, Germany
Jun 19 2018 Busan, Korea
Jul 08 2018 Baltimore, MD, USA