.The denitrification unit removes nitrogen from natural gas to prepare for pipeline transmission. According to the data of the natural gas Research Institute, 17% of the natural gas reserves in the United States contain high nitrogen content. Most pipeline standards require the nitrogen content in natural gas to be less than 4%. High nitrogen natural gas is basically stranded because it cannot be transported to the market through pipelines. If there is too much nitrogen in the pipeline, there is a risk of gas plug or poor combustion. Nitrogen also dilutes the calorific value of the gas, resulting in a decrease in BTU and its value.
Because nitrogen (N2) and methane (CH4) have similar molecular sizes and low dielectric constants, and lack of selective reactivity, such as carbon dioxide or hydrogen sulfide in amine units, denitrification is a difficult technical separation
Pressure swing adsorption (PSA), low temperature separation and lean oil absorption have all been used to remove nitrogen from natural gas.
Pressure swing adsorption (PSA) uses an adsorbent to selectively separate nitrogen from methane. The gas is then regenerated from the adsorbent by a combination of pressure and thermal changes. PSA is used for gas dehydration, carbon dioxide removal, denitrification and hydrocarbon dew point control.
Cryogenic separation uses cryogenic Thermodynamic Separation Based on the comparative boiling points of methane (- 259° F) and nitrogen (- 320° F). As the mixture cools, the methane will condense before the nitrogen, thereby separating the two.
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Post time: Aug-31-2022
