Method for reducing energy consumption during regeneration process of amine technology

A technology of regeneration process and amine method, which is applied in the fields of environmental protection, energy saving and consumption reduction, and gas purification

Inactive Publication Date: 2018-12-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the existing amine regeneration system has taken many energy-saving measures to ens...

Method used

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  • Method for reducing energy consumption during regeneration process of amine technology
  • Method for reducing energy consumption during regeneration process of amine technology

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Embodiment 1

[0022] as attached figure 1 Basic amine process flow diagram with water removal system at higher operating pressures shown. For natural gas, synthetic gas and other amine processes operating under relatively high absorption pressure, the water removal system of the present invention can be used in conjunction with a turbine system, that is, the rich liquid first goes to the turbine system to recover part of the high-pressure energy, and then the turbine outlet The depressurized rich liquid is introduced into the dewatering removal system and then sent to the regenerator. The present invention uses N-methyldiethanolamine (MDEA) absorbent with a mass fraction of 50% for testing. The pressure of the absorbent entering the water removal system is 1.45MPa. After water removal, about 25% of the total weight of the absorbent is removed. After the water is removed, the rich liquid is regenerated to the regenerator until no water is used. Removing the degree of absorbent regeneration...

Embodiment 2

[0024] Reference attached figure 2 , for the amine process operated under lower absorption pressure, such as power plant flue gas, the water movement system of the present invention needs to pressurize the amine liquid entering the system before removing the water. The present invention uses ethanolamine (MEA) absorbent with a mass fraction of 20% for testing. The rich liquid coming out of the absorber is pressurized to 0.70MPa by the rich liquid pump and then enters the water removal system. After water removal and movement, the water accounting for about 43% of the total weight of the absorbent is removed. After the water is removed, the rich liquid Regeneration of the liquid de-regenerator to the extent of absorbent regeneration without the use of the water removal system was calculated to reduce the regeneration heat consumption by about 27%.

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Abstract

Aiming at the problem of high rich liquor regeneration heat loss during a desulfurization of decarburization process of amine devices for refinery gas and power plant or boiler flue gas carbon captureduring natural gas purification, petroleum refining and processing, the invention provides a method for introducing a water removal system to reduce the water content of rich liquor entering a generator, thereby reducing heat input by the regenerator during a generation process of an absorbent. The water removal system mainly comprises one or more groups of reverse osmosis membrane components, and in order to guarantee the normal operation of the reverse osmosis membrane components, the water removal system possibly contain a solvent cleaning system and an absorbent cooling system. Through the introduction of the water removal system into the amine process, 15 to 65 percent o water in the rich liquor can be removed, and compared with the method not removing water, the regeneration heat loss can reach 30 percent.

Description

technical field [0001] The invention relates to a method for reducing energy consumption in the regeneration process of an amine process, and belongs to the technical fields of gas purification, environmental protection, and energy saving and consumption reduction. Background technique [0002] In industrial processes such as petroleum refining and processing, natural gas extraction, coal gasification synthesis, chemical industry, electric power metallurgy, etc., the removal of carbon dioxide (CO2) from industrial gas streams is basically involved. 2 ) and hydrogen sulfide (H 2 S) and other acid gases, the desulfurization and decarburization method using alcohol amine as absorbent is widely used in CO 2 、H 2 S acid gas removal. The desulfurization and decarbonization technology using alcohol amine as a solvent is collectively called the amine method. The aqueous solution of alcohol amine is in contact with the gas flow in the absorber, and the CO in the gas flow 2 、H 2 ...

Claims

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Application Information

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IPC IPC(8): B01D53/14
CPCY02A50/20Y02C20/40
Inventor 朱慧
Owner CHINA PETROLEUM & CHEM CORP
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