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Liquefied Natural Gas Pretreatment Equipment and Method Combining Membrane Separation and Temperature Swing Adsorption

A technology of liquefied natural gas and temperature swing adsorption, which is applied in separation methods, chemical instruments and methods, and gas treatment, and can solve problems such as large investment, numerous equipment, and complicated liquefied natural gas pretreatment process

Inactive Publication Date: 2021-03-16
兰文旭
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide liquefied natural gas pretreatment equipment and method combined with membrane separation and temperature swing adsorption in order to solve the problems of complex processing flow, various equipment and large investment in the existing liquefied natural gas pretreatment process.

Method used

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  • Liquefied Natural Gas Pretreatment Equipment and Method Combining Membrane Separation and Temperature Swing Adsorption

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] See attached figure 1. The liquefied natural gas pretreatment equipment combined with membrane separation and temperature swing adsorption includes a temperature swing adsorption heavy hydrocarbon removal system 1, a membrane separation system 2, a retentate gas cooling system 3, a temperature swing adsorption carbon dioxide removal system 4 and a regeneration gas booster 5; The heavy hydrocarbon removal system inlet pipe 11 of the temperature swing adsorption heavy hydrocarbon removal system 1 is used to feed raw natural gas; the heavy hydrocarbon removal system outlet pipe 12 of the temperature swing adsorption heavy hydrocarbon removal system 1 is separated from the membrane of the membrane separation system 2 through the pipeline. The inlet 21 is connected, and is used for the natural gas after the heavy hydrocarbon removal by the temperature swing adsorption deheavy hydrocarbon system 1 to enter the membrane separation system 2; The hydrocarbon system regeneration...

Embodiment 2

[0024] See attached figure 1. The liquefied natural gas pretreatment equipment combined with membrane separation and temperature swing adsorption includes a temperature swing adsorption heavy hydrocarbon removal system 1, a membrane separation system 2, a retentate gas cooling system 3, a temperature swing adsorption carbon dioxide removal system 4 and a regeneration gas booster 5; The heavy hydrocarbon removal system inlet pipe 11 of the temperature swing adsorption heavy hydrocarbon removal system 1 is used to feed raw natural gas; the heavy hydrocarbon removal system outlet pipe 12 of the temperature swing adsorption heavy hydrocarbon removal system 1 is separated from the membrane of the membrane separation system 2 through the pipeline. The inlet 21 is connected, and is used for the natural gas after the heavy hydrocarbon removal by the temperature swing adsorption deheavy hydrocarbon system 1 to enter the membrane separation system 2; The hydrocarbon system regeneration...

Embodiment 3

[0031] See attached figure 1. The liquefied natural gas pretreatment method combined with membrane separation and temperature swing adsorption adopts the above-mentioned liquefied natural gas pretreatment equipment combined with membrane separation and temperature swing adsorption, comprising the following steps:

[0032] In the first step, the raw natural gas with a pressure of 3-10 MPa and a carbon dioxide content higher than 2% passes through the filter 17 to filter solid and liquid impurities, and then enters the heavy hydrocarbon removal system inlet pipe 11 into the temperature swing adsorption heavy hydrocarbon removal system 1 for heavy hydrocarbon removal treatment ;

[0033] In the second step, after the heavy hydrocarbon content of the heavy hydrocarbon removal gas meets the requirements of natural gas liquefaction, it comes out from the outlet pipe 12 of the heavy hydrocarbon removal system, filters solid and liquid impurities through the filter 17, and then is he...

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Abstract

The invention discloses an apparatus and a method for pretreating liquefied natural gas by combining membrane separation with temperature swing adsorption, and belongs to the technical field of natural gas pretreatment. Natural gas subjected to heavy hydrocarbon removal using a temperature swing adsorption heavy hydrocarbon removal system is input into a membrane separation system, the permeate gas of the membrane separation system is used as the regeneration gas of the temperature swing adsorption heavy hydrocarbon removal system, and the regeneration gas is input to an internal combustion engine as a fuel after being utilized; the non-permeate outlet gas of the membrane separation system is used as the raw material gas of a temperature swing adsorption carbon dioxide removal system, andpurified natural gas treated by the temperature swing adsorption carbon dioxide removal system is output; and a part of the purified natural gas is used as the regeneration gas of the temperature swing adsorption carbon dioxide removal system, and the regeneration gas is returned to the temperature swing adsorption heavy hydrocarbon removal system for recycling after being utilized. The apparatusand the method for pretreating liquefied natural gas by combining membrane separation with temperature swing adsorption have the advantages of simple process and strong applicability, and can remove carbon dioxide, hydrogen sulfide, moisture, heavy hydrocarbons and other impurities in the natural gas by combining membrane separation with temperature swing adsorption.

Description

technical field [0001] The invention belongs to the technical field of natural gas pretreatment, and in particular relates to liquefied natural gas pretreatment equipment and method combined with membrane separation and temperature swing adsorption. Background technique [0002] Natural gas is a green, economical, affordable, safe and reliable high-quality energy. To develop the natural gas industry, the research on natural gas purification technology in natural gas liquefaction technology is also particularly important, because of the higher freezing point components in natural gas such as carbon dioxide, water and heavy hydrocarbons, Hydrogen sulfide, etc. will solidify and block equipment during natural gas liquefaction, and must be removed before liquefaction; the traditional pretreatment method is to remove acid gases such as carbon dioxide and hydrogen sulfide by alcohol amine method, and then use molecular sieve and activated carbon Composite bed adsorption removes wa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L3/10B01D53/04B01D53/22
CPCB01D53/0462B01D53/22B01D2257/702C10L3/101C10L3/103C10L3/104C10L3/106Y02C20/40
Inventor 兰文旭
Owner 兰文旭