Transport of hydrogen
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This post was last edited by sunjl1981 on 2013-1-7 00:26. The H2 produced through electrolysis is transported via pipes to users located several kilometers away; there is a considerable amount of water in these pipes. Where does this water come from? Was it added intentionally, or is there some other reason? I am a user of H2 here. Recently, people in my company said that due to the hazards associated with H2, the electrolysis plant deliberately added water to the H2 pipelines. Is that true? This post was last edited by limingshuguang on 2009-4-19 09:54 ] # hcbbs
The hydrogen produced by the electrolyzer is cooled using preheated brine before being delivered to the customer. Coming from the electrolyzer, this hydrogen contains water vapor; upon cooling, some of this vapor condenses, while another portion of the water is carried along with the hydrogen. As the temperature in the pipes drops, water will condense there. Although the amount is small, over time, water will accumulate in the pipes.
The hydrogen gas coming out of the electrolyzer is at a high temperature and therefore contains water vapor; as it cools down over a long distance, this water vapor condenses into water
Hydrogen is produced by electrolyzing an aqueous solution and contains water within it; hydrogen treatment merely involves cooling and partially removing the water, so the hydrogen still contains water. The solution is either to remove water thoroughly or to install a drainage device in the pipeline. Hydrogen content has nothing to do with safety
The hydrogen gas coming out of the electrolyzer contains saturated water vapor. It is normal to have water present during the cooling process of hydrogen transport. Freezing also needs to be prevented in winter. An automatic drainage device needs to be added to the delivery pipeline. (Overflow water seal). Adding water should not increase the safety factor.
Hydrogen carrying water can cause water hammer in pipelines. In areas with low temperatures, since hydrogen pipelines are generally not insulated, it is necessary to prevent the pipelines and valves from freezing damage.
Water will definitely precipitate during the long-distance transportation of hydrogen. It is not added manually; it is generated during the electrolysis process as water vapor, which then condenses during transportation to form water. The problem can be solved by adding a dehydration or drainage device at the bottom of the U-shaped pipe. This post was last edited by limingshuguang on 2009-4-19 09:55.]
It wasn’t added intentionally. In the chemical industry, water is generally not added on purpose, as it can lead to safety issues and offers no benefits, so it’s not added intentionally. The hydrogen gas coming out of the electrolyzer contains water vapor; the longer the pipeline, the more water cools down. If this water is not removed over time, a large amount of it will accumulate. This post was last edited by limingshuguang on 2009-4-19 09:55.]
Water accumulation in the pipes of the hydrogen system affects hydrogen pressure fluctuations; poor control of this situation can lead to plant shutdowns. On rainy days, lower temperatures increase water content, resulting in unstable pressure. That’s why no water is added to the system. U-shaped water drainage points are installed in all the delivery pipes to address this issue. In winter, inspections of these drainage points are intensified. Haha – those working in the control room know best just how serious hydrogen-related water accumulation can be
It is hydrogen condensate. When hydrogen is produced through electrolysis, its temperature is around 80 degrees, and it contains a significant amount of water vapor; as a result, this vapor condenses due to temperature differences during transportation. If it accumulates in the pipes over time, it can cause frequent fluctuations in hydrogen pressure, which is not conducive to safe operation. Therefore, it is necessary to install a certain number of hydrogen drip traps based on the slope of the pipes in order to avoid such situations.
The colleague upstairs explained it in great detail; if it’s in the northern region, consider insulating the hydrogen pipelines to prevent freezing in winter, which could cause pressure fluctuations.
The source of water in hydrogen is clearly explained: the pipelines need to be long, properly insulated, and dehumidification tanks should be installed at intervals along the pipelines; moreover, the pipelines between these tanks must have an inclination to ensure that all water is removed
Since the hydrogen that comes out of the electrolyzer is wet hydrogen, it cools down during transportation, and as a result some water condenses; this water is not added intentionally. Installing a certain amount of hydrogen water seal in the pipelines allows for timely drainage of water from those pipelines.
For pipelines used for transporting hydrogen over long distances, it is necessary to incorporate a certain slope as well as drain valves; as the temperature drops, more condensate water is generated, and the resulting impact becomes greater. Either the pipeline valves freeze and crack, or condensation blocks the pipes, or the flow of water within the pipes fluctuates, resulting in significant pressure swings. Add water to hydrogen? It’s a bit difficult.
The problem is that the hydrogen was not cooled and demisted before compression
A lot has been said about water-related issues earlier. Regarding the issue of long-distance transportation, to ensure safety during transport, that is, to reduce and prevent static electricity buildup, transporting hydrogen in a wet form is a safer approach. Because if there is an electrolyte in hydrogen, static electricity can be easily conducted away promptly, and it is discharged into the ground through the static grounding device installed on the hydrogen pipeline. At the same time, when designing the outer tube, the hydrogen flow rate should be kept at the allowable minimum value, with a certain margin left. Furthermore, to prevent water accumulation in the outer tube from affecting flow stability, it is necessary to avoid any accumulation of water inside the tube, that is, to ensure a pipe slope that is in line with the direction of flow. If the pipeline slope cannot be guaranteed, a water collection tank must be installed; of course, proper management of this tank is crucial.
A valve for releasing water can be added
Since it is saturated water, as the temperature in the pipes drops, water will condense. Although the amount is small, over time water will accumulate in the pipes
If there is water in the hydrogen pipeline, it can help buffer pressure; but what if the pipeline isn’t insulated and ice forms in cold weather? This post was last edited by limingshuguang on 2009-4-19 10:00.]