The impact of hydrogen on natural gas liquefaction
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Does hydrogen affect the liquefaction of natural gas?
I haven’t heard of any significant impacts from a process perspective; there may be issues related to power consumption. The main concerns are CO2 and aromatic hydrocarbons, which tend to freeze easily, as well as acidic corrosive gases like H2S and mercury. Nitrogen can also affect the calorific value of the vaporized gas
There is no dehydrogenation step before natural gas is liquefied, right?
The impact of hydrogen on the liquefaction of natural gas is mainly reflected in the following aspects: The boiling point of hydrogen is -252.87 degrees Celsius, while the liquefaction temperature of natural gas is -162 degrees Celsius; therefore, hydrogen cannot be liquefied at the liquefaction temperature of natural gas. If the hydrogen content in natural gas is high, it will result in high pressure in the flash tank or LNG storage tank, an increased amount of BOG emissions, and higher energy consumption for BOG recovery ； If not recovered, it will lead to increased methane loss. At the same time, the high hydrogen content reduces the partial pressure of methane, resulting in an increase in the cooling capacity required for liquefaction and thus higher power consumption. However, the hydrogen content in natural gas is generally low, so it has no impact on the liquefaction of natural gas.
The boiling point of hydrogen is lower than the liquefaction temperature of natural gas; if the hydrogen content in natural gas is high, it will cause high pressures in the flash tank or LNG storage tanks, an increase in BOG emissions, and consequently higher power consumption.
It mainly consumes compression work, and it’s even useless work~~~! ~!
Hydrogen can be returned to natural gas engines for combustion; it is unknown what impact this will have on the engines
Natural gas wells in China rarely contain hydrogen, and if any is present, it’s in trace amounts. Hydrogen has a low boiling point, so it has little impact on liquefaction
The higher the hydrogen content, the faster its combustion rate, and its explosion limit range is relatively wide, which may affect the explosion-proof rating when selecting instruments. Compressors have a high energy consumption ratio.