System and method for extracting helium from natural gas
A natural gas and helium technology, applied in the field of helium extraction, can solve the problems of helium economic value decline and high energy consumption
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[0029] Example 1
[0030] Such as figure 1 As shown, this embodiment provides a system for extracting helium from natural gas, including air expander 1, cooler 2, cold box 3, helium purification system; cold box 3 includes E1 main heat exchanger 4, C1 refined Distillation tower 7, K1 air reboiler 5 and K2 LNG reboiler 6, E2 subcooler 8, K3 condensing evaporator 9 arranged at the bottom of C1 rectification tower 7; the above helium purification system includes oxygen addition and hydrogen removal reaction The furnace 10, the cooler 11, the helium gas purifier 12, the compressor 13 and the Dewar 14 are provided with a heat exchanger 15, a gas-liquid separator 16 and an adsorber 17 in the Dewar 14.
[0031] The pipeline connection sequence is:
[0032] The air inlet end of the air expander 1, the cooler 2, and the top of the E1 main heat exchanger 4 are connected in sequence, and the air outlet end in the middle of the E1 main heat exchanger 4 passes through the K1 air reboiler 5 and ...
Example Embodiment
[0039] Example 2
[0040] Using the system provided in Example 1, this example provides a method for extracting helium from natural gas:
[0041] The air is compressed and pre-cooled and purified (the compression and pre-cooling and purification of air are conventional technologies in air separation, which will not be described in this invention). After removing water and carbon dioxide, the pressure is 0~0.7MPaA (absolute pressure, the same below) ), the flow rate is 4800Nm 3 / h, dry air with a temperature of 10-20°C. The above-mentioned dry air enters the inlet of the booster end of the air expander 1 through the pipeline GA-101, is pressurized to 0.9-1 MPaA, enters the cooler 2 to cool down to 40°C, and is sent to the cold box 3 through the pipeline GA-103. The air entering the cold box 3 first enters the E1 main heat exchanger 4 to cool down to -107~-109℃, is drawn from the middle of the E1 main heat exchanger 4 and then sent to the K1 air reboiler 5, using the heat of the air...
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