Method for preparing LNG (Liquefied Natural Gas) by recycling methanol tail gas
A technology for tail gas recovery and methanol, applied in separation methods, chemical instruments and methods, gas fuels, etc., can solve problems such as environmental pollution and waste of resources, and achieve the effect of reducing combustion volume and environmental pollution problems.
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[0007] The present invention will be further described in detail below with reference to the drawings and embodiments.
[0008] Such as figure 1 As shown, a method for recovering and utilizing methanol tail gas to produce LNG uses equipment including decarburization tower 1, molecular sieve 2, high and low temperature expander 3, heat exchanger 4, rectification tower 5, decarburization tower 1 and molecular sieve 2 The molecular sieve 2 is connected to the heat exchanger 4, the heat exchanger 4 is connected to the low-temperature rectification tower 5, and the high and low temperature expander 3 is connected to the heat exchanger 4. The cold energy of the heat exchanger comes from the high and low temperature expander 3. The characteristic is that the methanol tail gas passes through the decarburization tower 1 to remove the carbon dioxide in the tail gas, so that the carbon dioxide content in the tail gas is below 30 ppm, and then enters the molecular sieve 2 to remove heavy hyd...
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