Gas expansion natural gas pressurized liquefying technique with function of condensing and removing carbon dioxide (CO2)

A technology of gas expansion and natural gas, applied in the liquefaction process of desublimation to remove carbon dioxide, and the liquefaction process of low-temperature removal of carbon dioxide, can solve the problems that cannot guarantee that natural gas will not be precipitated, does not involve natural gas liquefaction process, and is difficult to popularize and apply. Save equipment investment, improve tolerance, and reduce energy consumption

Inactive Publication Date: 2012-08-08
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the material of the cooler in this patent needs to be one of metal oxide, ceramics, single crystal or sapphire, which is too special and expensive to be popularized and applied; and the solid phase as the core of the patent is in the center of the container rather than on the wall Formed technology, it is difficult to realize in engineering practice
The paten...

Method used

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  • Gas expansion natural gas pressurized liquefying technique with function of condensing and removing carbon dioxide (CO2)
  • Gas expansion natural gas pressurized liquefying technique with function of condensing and removing carbon dioxide (CO2)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A CO removal with desublimation 2 The gas expansion natural gas liquefaction process under pressure, the implementation scheme is as follows figure 1 shown. The gas expansion cycle refrigerant is pure methane, the flow rate is 6.693 kmol / h, and the molar composition of raw natural gas is 0.5% CO 2 +99.5%CH 4 , pressure 1.5MPa, temperature 35°C, flow rate 1kmol / h, CO removal with desublimation 2 The specific steps of the gas expansion natural gas liquefaction process under pressure are as follows:

[0034] (1) Since the raw natural gas is within the pressure range of 1.4-1.6 MPa, the pressure regulating device 1 can be omitted in this embodiment. The raw material gas is introduced into the precooler 2, absorbs cooling energy from the refrigerant methane, flows out of the precooler 2, and the temperature drops to -73°C;

[0035] (2) The natural gas after step (1) pre-cooling is introduced into the crystallizer 3, and the cooling capacity is absorbed from the refriger...

Embodiment 2

[0042] A CO removal with desublimation 2 The gas expansion natural gas liquefaction process under pressure, in the process of natural gas liquefaction to desublimate CO 2 , and then produce LNG products under pressure. The innovative design of the process cancels the CO 2 Pretreatment device, and ensure no CO in the subsequent liquefaction process 2 Crystals precipitated.

[0043] The gas expansion cycle refrigerant is pure methane, the flow rate is 7.837kmol / h, and the molar composition of raw natural gas is 10% CO 2 +90%CH 4 , pressure 1.5MPa, temperature 35°C, flow rate 1kmol / h, CO removal with desublimation 2 The specific steps of the gas expansion natural gas liquefaction process under pressure are as follows:

[0044] (1) Since the raw natural gas is within the pressure range of 1.4-1.6 MPa, the pressure regulating device 1 can be omitted in this embodiment. The raw material gas is introduced into the precooler 2, absorbs cooling energy from the refrigerant methane...

Embodiment 3

[0052] A CO removal with desublimation 2 The gas expansion natural gas belt pressure liquefaction process, the process is mainly for CO 2 higher content of natural gas designed for CO 2 Natural gas with a mole fraction less than or equal to 0.5%, the PLNG process can tolerate all CO 2 It does not precipitate solids, so it can directly remove CO, which occupies a large area 2 Pretreatment equipment provides the possibility to implement natural gas liquefaction on offshore platforms with extremely limited sites. for CO 2 Natural gas with a mole fraction greater than 0.5%, using CO 2 The desublimation characteristics of the natural gas through the cold energy provided by the pressurized liquefaction process 2 Desublimation removal, using pressure liquefaction technology to liquefy natural gas, so as to remove CO 2 The purpose of pretreatment device and reducing floor space.

[0053] With desublimation to remove CO 2 The main feature of the gas expansion natural gas liquef...

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Abstract

The invention relates to a gas expansion natural gas pressurized liquefying technique with a function of condensing and removing carbon dioxide (CO2), which comprises the steps of: precooling natural gas at a gaseous state in a precooler, continuously cooling the natural gas in a crystallizing device, condensing and separating solid dry ice while lowering the content of the CO2 to 0.5 percent, then pressurizing the natural gas in a low-temperature compressor, then introducing the natural gas in a liquefying device and liquefying the natural gas under higher pressure and then introducing the liquefied natural gas into a storage tank for storing. The cold capacity needed by the liquefying process is supplied by an independent gas expansion refrigeration circulation. Compared with the prior art, the gas expansion natural gas pressurized liquefying technique has the advantages that: a CO2 pretreatment device occupying a large floor area in the conventional natural gas liquefying process can be saved, so that the investment cost for liquefying the natural gas on an offshore platform in high price can be greatly reduced. Meanwhile, the energy loss of the refrigeration circulation can be reduced when the natural gas is liquefied at a higher temperature.

Description

technical field [0001] The invention belongs to the field of chemical industry and low temperature technology, relates to the purification and liquefaction process of natural gas, is a liquefaction process for removing carbon dioxide at low temperature during the liquefaction process of natural gas, and especially relates to a desublimation desublimation process during the liquefaction process of gas expansion natural gas under pressure. Liquefaction process for carbon dioxide removal. Background technique [0002] Exploration practice has proved that there are abundant oil and gas resources in many sedimentary basins in China's sea area, and the proven offshore natural gas reserves are about 1 / 3 of the national natural gas reserves. The development and utilization of offshore natural gas can not only provide a clean energy with high calorific value, but also reduce the dependence on oil resources, which has important environmental protection and energy strategic security si...

Claims

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Application Information

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IPC IPC(8): F25J3/08
CPCF25J1/0022F25J1/005F25J1/0072F25J1/0082F25J1/0204F25J1/0254F25J1/0288F25J2205/20F25J2220/66F25J2230/08F25J2230/30
Inventor 林文胜熊晓俊
Owner SHANGHAI JIAO TONG UNIV
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