Method and device for double-stage expansion refrigeration high methane gas liquefaction

A two-stage expansion and methane gas technology, applied in the field of natural gas, can solve the problems of loss of expansion work, difficulty in separating heavy hydrocarbons, and large methane loss, and achieve the effects of small methane loss, reduced energy consumption, and high nitrogen separation coefficient

Active Publication Date: 2016-08-03
CHENGDU SEPMEM SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] The purpose of the present invention is to provide a method for the existing production method of liquefied natural gas, which has difficulties in separating heavy hydrocarbons, cumbersome opera

Method used

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  • Method and device for double-stage expansion refrigeration high methane gas liquefaction
  • Method and device for double-stage expansion refrigeration high methane gas liquefaction
  • Method and device for double-stage expansion refrigeration high methane gas liquefaction

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Embodiment 1

[0073] The flow chart of this embodiment is as follows figure 1 As shown, this process includes pretreatment system (T1), expander (P1, P2), cycle gas compressor (C1, C2, C3), cooler (E1, E2, E3), heat exchanger (E4), Heavy hydrocarbon separator (V2), gas-liquid separator (V1), LNG storage tank (V3), throttle valve I, throttle valve II, etc., the methane-rich gas liquefaction system and open cycle are formed through pipelines between each component Cooling System.

[0074] The working steps of this embodiment are as follows:

[0075] (1) Liquefaction of methane-rich gas:

[0076] The untreated methane-enriched raw material gas 1 is processed by the pretreatment system T1 to obtain the methane-enriched raw material gas 2 . The methane-enriched raw material gas 2 is mixed with part of the preheated gas 19 (mentioned below) to obtain the material 3, which is cooled in the heat exchanger E4 to obtain the material 4. Material 4 exits heat exchanger E4 and enters heavy hydrocarb...

Embodiment 2

[0082] The flow chart of this embodiment is as follows figure 2 As shown, this process includes pretreatment system (T1), expander (P1, P2), cycle gas compressor (C1, C2), cooler (E1, E2), heat exchanger (E3), heavy hydrocarbon separator (V2), gas-liquid separator (V1), LNG storage tank (V3), throttle valve I, throttle valve II, etc., the methane-enriched gas liquefaction system and open cycle refrigeration system are formed through pipelines between each component.

[0083] The working steps of this embodiment are as follows:

[0084] (1) Liquefaction of methane-rich gas:

[0085]The untreated methane-enriched raw material gas 1 is processed by the pretreatment system T1 to obtain the methane-enriched raw material gas 2 . The methane-enriched raw material gas 2 is mixed with part of the preheated gas 19 (mentioned below) to obtain the material 3, and the material 3 is cooled in the heat exchanger E3 to obtain the material 4. Material 4 exits heat exchanger E3 and enters h...

Embodiment 3

[0091] The flow chart of this embodiment is as follows image 3 As shown, this process includes pretreatment system (T1), expanders (P1, P2), methane flash gas compressors (C1, C2), methane-enriched cycle gas compressors (C3, C4), coolers (E1, E2 , E3, E4), heat exchanger (E5), separator (V1), heavy hydrocarbon separator (V2), LNG storage tank (V3), throttle valve I, throttle valve II, etc. The pipeline constitutes a methane-rich gas liquefaction system and a closed cycle refrigeration system.

[0092] The working steps of this embodiment are as follows:

[0093] (1) Liquefaction of methane-rich gas:

[0094] The untreated methane-enriched raw material gas 1 is processed by the pretreatment system T1 to obtain the methane-enriched raw material gas 2 . The methane-enriched feed gas 2 is mixed with the preheated gas 16 to obtain the material 3, which is cooled in the heat exchanger E5 to obtain the material 4. The material 4 exits the heat exchanger E5 and enters the heavy h...

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Abstract

The invention discloses a method and device for double-stage expansion refrigeration high methane gas liquefaction and belongs to the field of high methane gas separation and liquefaction. According to the purposes of the method and device for double-stage expansion refrigeration high methane gas liquefaction, the problems of difficult heavy hydrocarbon separation, cumbersome operation, high equipment investment, large methane loss and high energy consumption in an existing production method for liquefied natural gas are solved. The method comprises the steps of high methane gas liquefaction and circulation refrigeration. After high methane feed gas and preheating gas are mixed, the mixture is subjected to heat exchanger cooling, throttling depressurization and gas-liquid separation, liquefied high methane gas and low-temperature flashing steam are obtained; and the liquefied high methane gas is collected as a product, and the low-temperature flashing steam is subjected to open type circulation refrigeration or closed circulation. The method and device have the advantages of being simple in procedure, low in energy consumption, flexible in operation, low in equipment investment, small in methane loss, good in nitrogen separation effect, easy in heavy hydrocarbon removal and the like.

Description

technical field [0001] The invention relates to the field of natural gas, especially the field of separation and liquefaction of methane-rich gas, and specifically relates to a method and device for liquefaction of methane-rich gas with two-stage expansion refrigeration. Background technique [0002] The growth of natural gas consumption has promoted the rapid development of the liquefied natural gas industry. Since Shanghai LNG Accident Gas Source Backup Station (Phase I) was completed and put into operation in 1999, after more than ten years of development, China's LNG industry has gone from mainly relying on the introduction of foreign complete sets of technology and equipment to domestic independent R&D and production of LNG The process of producing the device. [0003] At present, there are three types of natural gas liquefaction refrigeration processes commonly used in China: cascade refrigeration process, expansion refrigeration process and hybrid refrigeration proce...

Claims

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Application Information

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IPC IPC(8): F25J3/06F25B15/06
CPCF25J1/0022F25J1/0037F25J1/004F25J1/005F25J1/0082F25J1/0202F25J1/0208F25J2220/64F25J2270/06F25J2270/16F25J3/06F25B15/06F25J3/0615F25J3/063
Inventor 张惊涛母斌
Owner CHENGDU SEPMEM SCI & TECH
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