Decarbonization method for producing liquefied natural gas from high-carbon natural gas

A technology of liquefied natural gas and natural gas, applied in chemical instruments and methods, separation methods, gas fuels, etc., can solve the problems of decarbonization purification degree and processing load contradiction, high regeneration heat consumption and power consumption, low acid gas load, etc. , to achieve the effect of reducing solution circulation, increasing processing load, and good decarburization performance

Active Publication Date: 2020-01-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

MEA and DEA are primary and secondary amines, with strong alkalinity, and CO 2 The reaction speed is fast, and it has a good absorption speed. It is often used for CO 2 In the case where the partial pressure in the mixed gas is lower than 0.2MPa, but limited to the strong corrosiveness of MEA and DEA, the general use concentration is 15%~25% lower, the acid gas load is smaller, and a

Method used

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  • Decarbonization method for producing liquefied natural gas from high-carbon natural gas

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Embodiment 1

[0031] Mixed gas pressure is 4.0MPa, room temperature, CO 2 The content is 12.0%, the rest is N 2 . The absorption solution of the present invention is composed of 20% aminoethylethanolamine, 20% MDEA, and the rest is water. Under the gas-liquid ratio of the crude absorption tower of 300, the pressure of the high-pressure flash tank is 0.65MPa, 75°C, the pressure of the low-pressure flash tank is 0.15MPa, 90°C, the lean liquid accounts for 1 / 4 of the total amine liquid circulation, and the semi-lean liquid is 45°C. The temperature is 55°C, the CO in the purified gas 2 35ppmv.

Embodiment 2

[0033] Mixed gas pressure is 4.0MPa, room temperature, CO 2 The content is 12.0%, the rest is N 2 . The absorption solution of the present invention is composed of 20% aminoethylethanolamine, 20% MDEA, and the rest is water. Under the gas-liquid ratio of the crude absorption tower of 300, the pressure of the high-pressure flash tank is 0.65MPa, 75°C, the pressure of the low-pressure flash tank is 0.15MPa, 95°C, the lean liquid accounts for 1 / 4 of the total amine liquid circulation, and at 50°C, the semi-lean liquid The temperature is 55°C, the CO in the purified gas 2 20ppmv.

Embodiment 3

[0035] Mixed gas pressure is 4.0MPa, room temperature, CO 2 The content is 12.0%, the rest is N 2 . The absorption solution of the present invention is composed of 25% aminoethylethanolamine, 20% MDEA, and the rest is water. Under the gas-liquid ratio of the crude absorption tower of 350, the pressure of the high-pressure flash tank is 0.70MPa, 75°C, the pressure of the low-pressure flash tank is 0.15MPa, 95°C, the lean liquid accounts for 1 / 4 of the total amine liquid circulation, 55°C, and the semi-lean liquid The temperature is 60°C, the CO in the purified gas 2 20ppmv.

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Abstract

The invention discloses a decarbonization method for producing liquefied natural gas from high-carbon natural gas. CO2 is removed from natural gas with a CO2 volume fraction of 10% or more to produceliquefied natural gas with a CO2 content of not more than 50 ppmv in the purified gas. Through the manner of rough decarburization and deep decarburization of a coarse absorption tower and a fine absorption tower, inputting a rich liquid of the fine absorption tower to the top of the coarse absorption tower, and high and low pressure flash evaporation or two-stage regeneration, the decarburizationefficiency is improved, and at the same time, process power consumption and regeneration natural gas consumption are reduced. A decarburization solvent consists of A and B two amines. The method reduces a circulation amount of a decarburization solution under the condition that purification indexes are met, and the benefits brought by reducing the circulation amount of the decarburization solution are as follows: saving purified natural gas used as fuel gas in a regeneration process, increasing treatment load of a decarburization apparatus, and reducing equipment investment and operating cost.

Description

technical field [0001] The invention belongs to the field of natural gas exploration and development ground construction engineering, and specifically relates to a decarbonization method for producing liquefied natural gas from high-carbon natural gas. Background technique [0002] Natural gas is a high-quality, efficient and clean low-carbon energy and chemical raw material, and its status as a resource is becoming increasingly prominent. To reduce CO 2 , dust and other pollutants, the global demand for natural gas continues to increase steadily, and China is growing rapidly. With the increasing demand for natural gas, some low-quality high-carbon natural gas (CO in raw natural gas 2 The volume fraction is not less than 10%) gas wells and gas fields are also under development and construction. Liquefied natural gas (LNG) is small in size, easy to transport, and flexible in storage and use in end-user networks, so a lot of natural gas will be used to produce LNG after ext...

Claims

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Application Information

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IPC IPC(8): C10L3/10B01D53/78B01D53/62
CPCB01D53/62B01D53/78B01D2252/20405B01D2257/504C10L3/104Y02C20/40
Inventor 毛松柏陈园园周志斌朱道平余勇杨绪甲宋丽
Owner CHINA PETROLEUM & CHEM CORP
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