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Device and method for extracting helium through natural gas low-temperature throttling

A natural gas and low-temperature technology, which is applied in the field of natural gas low-temperature throttling and extraction of helium, can solve the problems of high investment and complicated process flow, and achieve the effect of reducing energy consumption and optimizing cooling capacity of the device

Pending Publication Date: 2020-11-24
CHINA PETROLEUM ENG & CONSTR +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using rectification tower to separate and extract helium at low temperature can effectively enrich helium, but the process is relatively complicated and the investment is high

Method used

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  • Device and method for extracting helium through natural gas low-temperature throttling
  • Device and method for extracting helium through natural gas low-temperature throttling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Such as figure 1As shown, a natural gas low-temperature throttling extracting helium device includes a cold box 2 and a flash tank 16, the cold box 2 is connected to the natural gas inlet pipeline 1, and the cold box 2 is provided with a first throttle valve The pipeline of 14 is connected with the flash tank 16, and the top gas phase outlet of the flash tank 16 is connected with the cold box 2 through a pipeline, and after the top gas phase of the flash tank 16 is condensed in the cold box 2, it is connected with the separation tank 19 connection, the gas phase outlet at the top of the separation tank 19 is connected to the cold box 2 through a pipeline, and after being reheated by the cold box 2, it is sent to the subsequent process through a pipeline, and the liquid phase outlet at the bottom of the separation tank 19 is provided with a second section The pipeline of the flow valve 23 is connected with the cold box 2, and after being reheated by the cold box 2, it is...

Embodiment 2

[0034] Such as figure 2 As shown, embodiment 2 is basically the same as embodiment 1, and its main difference is: the outlet end of the precooling section in the described cold box 2 is connected with the deheavy hydrocarbon tower 4 by pipeline, and the top of the deheavy hydrocarbon tower 4 The outlet of the gas phase is connected to the inlet end of the secondary precooling section in the cold box 2 through a pipeline, and the outlet end of the secondary precooling section in the cold box 2 is connected to the reflux tank 7 of the heavy hydrocarbon removal tower through a pipeline. The gas phase of the tower reflux tank 7 is connected with the condensation section in the cold box 2 through a pipeline; The upper part is connected, and the liquid hydrocarbons at the bottom of the heavy hydrocarbon removal tower 4 are sent to the subsequent process through the pipeline.

[0035] Based on the above-mentioned structural design differences, the main difference in the low-tempera...

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Abstract

The invention discloses a device and method for extracting helium through natural gas low-temperature throttling. The device comprises a cold box and a flash tank, wherein the cold box is connected with a natural gas inlet pipeline and the flash tank; a top gas phase outlet of the flash tank is connected with the cold box; a bottom liquid phase outlet of the flash tank is connected with a first-stage booster pump; and after being boosted by the first-stage booster pump, the liquid phase is divided into two paths, one path is boosted by a second-stage booster pump and then connected with the cold box through a pipeline, and the other path is connected with the cold box through a pipeline, reheated by the cold box, connected with the expansion end of an expansion machine through a pipeline,expanded, connected with the cold box through a pipeline, reheated by the cold box, connected with the boosting end of the expansion machine through a pipeline, boosted and then connected with a cooling unit through a pipeline. Helium in natural gas is concentrated and recycled through natural gas low-temperature throttling, liquid hydrocarbon throttling and natural gas expansion are adopted for providing cooling capacity for the device, cooling capacity does not need to be provided through external refrigeration, cooling capacity optimal matching is achieved, and energy consumption of the device is reduced.

Description

technical field [0001] The invention belongs to the technical field of natural gas processing, and in particular relates to a device and method for extracting helium from natural gas with low temperature throttling, which is suitable for extracting helium from natural gas containing helium. Background technique [0002] Helium is an extremely light, colorless, odorless, and tasteless monatomic gas at normal temperature, and it is also the most difficult to liquefy among all gases, and its liquefaction temperature reaches -268.9°C at normal temperature. Helium has a wide range of uses in medical, optical fiber, and superconducting fields. Natural gas containing helium is currently the only source of helium production in industry. The lowest helium content in natural gas is only 0.05%, and the highest can reach 8%. Utilizing the difference in boiling points between helium and natural gas, cryogenic rectification and helium extraction technology is still the main way to extra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25J3/02
CPCF25J3/0209F25J3/029F25J3/0233F25J3/0238F25J3/0257F25J2200/74F25J2200/02F25J2205/02F25J2235/60F25J2270/04F25J3/061F25J3/0635F25J3/066F25J3/069
Inventor 王科韩淑怡蒲黎明李莹珂杜娟陈运强刘玉洁尹奎陈凯文杨苗李嘉迪赵雨亮乔研佳
Owner CHINA PETROLEUM ENG & CONSTR