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

Active Publication Date: 2017-11-10
CHENGDU SEPMEM SCI & TECH
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Problems solved by technology

[0006] The purpose of the invention of the present invention is: exist C for existing natural gas light hydrocarbon recovery method 3 To solve the problems of low yield, complex process flow, poor load regulation ability, and high energy consumption, a method and device for recovering light hydrocarbons from mixed refrigerant refrigeration natural gas are provided.

Method used

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  • A method and device for recovering light hydrocarbons from mixed refrigerant refrigeration natural gas
  • A method and device for recovering light hydrocarbons from mixed refrigerant refrigeration natural gas

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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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Abstract

The invention discloses a method and device for recovering natural gas light hydrocarbons in mixed refrigerant refrigeration, belonging to the field of natural gas light hydrocarbon recovery, and aims to solve the problems of low C3 yield, complex process flow and load adjustment ability in existing natural gas light hydrocarbon recovery methods Poor, high energy consumption problems. In the present invention, the feed gas enters the main heat exchanger, enters the deethanizer after being partially condensed; The liquid phase drawn from the bottom of the alkanizer enters the debutanizer; the liquefied petroleum gas product and the condensate product are obtained from the top and bottom of the debutanizer respectively. In the present invention, the cooling capacity required for the light hydrocarbon recovery process is provided by a mixed refrigerant refrigeration system. The invention has the advantages of high C3 yield, flexible operation, strong raw material adaptability, low energy consumption, simple process, less investment, etc., has good application prospects, and is worthy of large-scale popularization and application.

Description

technical field [0001] The invention relates to the field of natural gas, in particular to the field of condensation and separation of natural gas, in particular to a method and device for recovering light hydrocarbons from mixed refrigerant refrigeration natural gas. Background technique [0002] Light hydrocarbon recovery refers to the process of recovering components heavier than methane or ethane in natural gas in liquid form. Through the recovery of light hydrocarbons, on the one hand, the hydrocarbon dew point of natural gas can be controlled to achieve the commercial gas quality index and avoid gas-liquid two-phase flow; on the other hand, the recovered liquid hydrocarbons have great economic value and can be directly used as fuel. It can be further separated into ethane, propane, butane or mixture of propane and butane (liquefied gas), light oil and other chemical raw materials. [0003] At present, light hydrocarbon recovery methods mainly include adsorption method...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25J3/02F25J3/06
CPCF25J3/0209F25J3/0233F25J3/0242F25J2200/02F25J2200/74F25J2205/04F25J2215/64F25J2270/12F25J2270/66
Inventor 张惊涛母斌
Owner CHENGDU SEPMEM SCI & TECH
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