A method and device for recovering light hydrocarbons from mixed refrigerant refrigeration natural gas
A technology for the recovery of mixed refrigerant and light hydrocarbons, applied in refrigeration and liquefaction, cold treatment separation, liquefaction, etc., can solve the problems of poor load regulation ability, complex process flow, low yield, etc., and achieve uniform temperature difference and high C3 yield. , the effect of low cooling temperature
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Embodiment 1
[0039] The flow chart of this embodiment is as follows figure 1 As shown, the workflow of this embodiment is as follows.
[0040]The raw material gas enters the main heat exchanger 1, and after being cooled and partially condensed, enters the deethanizer 2 from the middle part of the deethanizer 2 for separation. The gas phase separated from the top of the deethanizer 2 enters the main heat exchanger 1 for cooling and partial condensation, and then enters the deethanizer top separator 3 at the top of the deethanizer 2 for gas-liquid separation to obtain low-temperature product gas 1. The liquid phase material is refluxed at the top of the tower, and the low-temperature product gas (mainly composed of C1 and C2 hydrocarbons) is reheated by the main heat exchanger 1 to obtain the product gas. The top reflux liquid phase material (mainly composed of C3 and above hydrocarbons) is pressurized by the deethanizer top reflux pump 4, and returns to the deethanizer 2 from the upper par...
Embodiment 2
[0047] The flow chart of this embodiment is as follows figure 2 As shown, the workflow of this embodiment is as follows.
[0048] The raw material gas enters the main heat exchanger 1, and after being cooled and partially condensed, it enters the low-temperature separator 2 for primary separation to obtain the primary gas phase and liquid phase respectively, and the primary gas phase enters the deethanizer from the middle of the deethanizer 3 3 for separation, the primary liquid phase is returned to the main heat exchanger 1 for reheating to obtain the first reheated material, and the first reheated material enters the deethanizer 3 from the lower part of the deethanizer 3 for separation.
[0049] The gas phase drawn from the top of the deethanizer 3 enters the main heat exchanger 1 for cooling and partial condensation, and then enters the deethanizer top separator 4 for gas-liquid separation to obtain low-temperature product gas and top reflux liquid phase materials respecti...
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