Absorption liquid regeneration method and special-purpose absorption liquid regeneration device

A liquid absorption and desorption technology, applied in separation methods, chemical instruments and methods, separation of dispersed particles, etc., can solve problems such as increasing energy consumption

Active Publication Date: 2014-06-25
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this invention uses steam to purge and condense to obtain high concentration of carbon dioxide, so the steam generation and condensation process will increase energy consumption

Method used

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  • Absorption liquid regeneration method and special-purpose absorption liquid regeneration device

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Effect test

Embodiment 1

[0026] The MDEA solution coming out of the membrane contactor contains CO 2 The concentration of the gas is 3.3wt%, the flow rate is 250L / h, the pressure is 6.0MPa, the temperature is 40°C, and after heating to 70°C, it enters the tube side of the membrane contactor for regeneration from bottom to top; the flow rate is 500m 3 / h purge nitrogen, the concentration is lower than 0.08%, pressurized to 6.0MPa, enters the heater to heat to 90 ℃, and then enters the shell side of the membrane contactor from top to bottom to contact with the rich liquid of MDEA absorbent in reverse, MDEA absorbent The rich liquid releases acid gas under the thermal effect, which is carried out from the shell side by the purge gas, and the concentration of acid gas in the MDEA absorbent at the outlet of the membrane contactor is reduced to 0.18wt%.

[0027] After the sweep gas comes out of the membrane contactor, it contains CO 2 gas, at a concentration of 1%, into CO 2 Separation membrane for CO 2 ...

Embodiment 2

[0029] The DEA solution from the absorption tower contains CO 2 The concentration of the gas is 2.6wt%, the flow rate is 100L / h, the pressure is 0.15MPa, the temperature is 45°C, and after heating to 100°C, it enters the tube side of the membrane contactor for regeneration from bottom to top; the flow rate is 360m 3 / h purge nitrogen, the volume fraction is less than 0.09%, pressurized to 0.12MPa, enters the heater to heat to 100°C, and then enters the shell side of the membrane contactor from top to bottom to contact with the DEA absorbent rich liquid in reverse, and the DEA absorbs The agent-rich solution releases acid gas under the thermal effect, and is carried out from the shell side by the purge gas, and the concentration of acid gas in the DEA absorbent at the outlet of the membrane contactor is reduced to 0.5wt%.

[0030] After the sweep gas comes out of the membrane contactor, it contains CO 2 gas, at a concentration of 0.5%, into CO 2 Separation membrane for CO 2 ...

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Abstract

The invention discloses an absorption liquid regeneration method and a special-purpose absorption liquid regeneration device, the absorption liquid regeneration method comprises the following processes: an acidic-gas-containing absorption liquid is sent into a tube side or a shell side of a membrane contactor for desorption regeneration, nitrogen is used for purging of the tube side or the shell side of the membrane contactor; after the purging, the nitrogen contains an acidic gas, the nitrogen containing the acidic gas enters a membrane separation device using an acid gas separation membrane for acid gas separating, and the separated nitrogen is led into the tube side or the shell side of the membrane contactor, and is used for purging of the acid gas in the membrane contactor, so that the nitrogen can be recycled; in addition, the nitrogen is separated from a compression gas by using a membrane separation device with an oxygen and nitrogen separation membrane, and is used for supplement of nitrogen loss during operation process. According to the method, a membrane contactor is used for absorption liquid regeneration, the mass transfer area is improved, the absorption liquid regeneration temperature is reduced, and by recycling of purging nitrogen, the absorption liquid regeneration energy consumption is effectively reduced. The absorption liquid regeneration method has the advantages of being simple in equipment and easy to operate.

Description

technical field [0001] The invention relates to a method and device for regenerating absorption liquid. Background technique [0002] Natural gas is the third largest fossil fuel energy in the world today and plays a pivotal role in the energy structure. The produced natural gas contains a certain amount of acid gas, such as carbon dioxide and hydrogen sulfide. These acid gases will reduce the calorific value of the gas and corrode the pipeline during transportation, so they need to be separated and removed. At present, the most commonly used method for removing acid gas is the absorption liquid absorption method. The absorption liquid needs to be regenerated and recycled after absorbing the acid gas. However, the traditional stripping tower regeneration method has high energy consumption, high operating temperature, and easy Decomposition, and problems such as mist entrainment, liquid flooding, and liquid leakage often occur during operation. Exploring a new type of abso...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14
Inventor 曹义鸣华从贵康国栋刘丹丹周美青刘健辉袁权
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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