Steam coming from the pipes of the new hydrogen engine
Thread Content
For diesel-based new hydrogen generators that use reformed hydrogen as a feedstock at 2 MPA and 40 degrees Celsius, the pipelines and tanks ranging from the inlet compressor buffer tank to the first-stage compressor buffer tank often experience condensation; the temperature of these pipelines is also quite low. What is the reason for this, and what is the principle behind this phenomenon? This post was last edited by sky888 on 2009-4-18 16:13]
What you have written are the design values. Reasons for pipeline sweating: 1. The actual temperature of the reforming hydrogen is often below 20°C, which allows moisture in the air to condense ； ⒉If the airflow velocity within the pipeline is too high, it carries away the temperature from the pipeline surface, causing the moisture in the air to condense. This phenomenon can be seen on the PSA analysis gas pipeline. Last edited by Zhongyuanren on 2009-4-18 19:00]
Liquid-phase vaporization is endothermic, and it depends on whether the composition of the hydrogen gas contains heavier hydrocarbons.
The hydrocarbons contained in the reforming hydrogen absorb heat during vaporization, and excessive humidity in the air can cause sweating in the pipelines.
Possible reasons: 1. There is an excessive amount of hydrocarbons in the reforming hydrogen. 2. The flow rate at the compressor inlet is insufficient; as a result, the hydrogen pressure drops, causing the hydrocarbons present to vaporize, which absorbs heat
Insufficient flow at the compressor inlet results in low inlet pressure; as a consequence, part of the liquid in the 2 MPa feed gasifies, absorbing heat and leading to water formation. It is recommended to analyze the composition of the feed material, and also to examine whether there is any gasification issue by considering the operating pressure. If such an issue exists: 1) increase the flow at the reverse inlet, 2) purify the feed material
It is likely the result of a phase change; the purity of hydrogen is not high, and it probably contains hydrocarbon components. It is recommended to stabilize these components, as otherwise they can be harmful to the equipment when they enter the cylinder.
Generally, the diameter of the pipes connecting the buffer tank to the main body’s buffer tank is much smaller than that of the hydrogen main pipe. In the case of the main pipe, the flow velocity is much higher, so heat is carried away rapidly; as a result, this section experiences sweating, while other sections do not