A Method for Promoting the Regeneration of Carbon Dioxide Absorbent Using Throttling Expansion Principle

A technology of throttling expansion and carbon dioxide, which is applied in chemical instruments and methods, separation methods, reagents, etc., can solve the problems of low gas-liquid mass transfer efficiency, oxidative degradation, and increased energy consumption, and achieve shortened residence time and high mass transfer efficiency. The effect of improving and reducing the material consumption of absorbent

Active Publication Date: 2018-09-21
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In summary, the current CO 2 There are two problems of energy consumption and material consumption in the absorbent regeneration process: a. The regeneration process based on chemical absorption is an endothermic process. Because of the relatively low gas-liquid mass transfer efficiency of traditional regeneration equipment, it is necessary to increase the mass transfer by increasing the temperature Driving force for proper mass transfer
Maintaining high temperature conditions will not only lead to an increase in energy consumption, but also a large amount of ineffective energy consumption due to the large amount of water evaporation in the absorbent caused by high temperature; material consumption

Method used

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  • A Method for Promoting the Regeneration of Carbon Dioxide Absorbent Using Throttling Expansion Principle
  • A Method for Promoting the Regeneration of Carbon Dioxide Absorbent Using Throttling Expansion Principle
  • A Method for Promoting the Regeneration of Carbon Dioxide Absorbent Using Throttling Expansion Principle

Examples

Experimental program
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Effect test

Embodiment 1

[0048] The mass composition is 20%MDEA+40%NHD+40%H 2 Absorbent for O (initially loaded CO 2 The concentration is 1.30mol / L), using a metal sintered plate with a nominal pore size of 2μm and a hydraulic diameter of 4.8cm as the throttling element, the experimental device is as follows figure 1 shown. Operating conditions: The pressure difference is 70kPa (100kPa absolute pressure on the upstream side of the throttling element, 30kPa absolute pressure on the downstream side), the regeneration temperature is 70°C, and the absorbent flow rate is 0.9L / h.

[0049] When the system reaches a steady state, detect the CO in the absorbent regeneration lean liquid flowing out from the absorbent regeneration lean liquid outlet 3-5 2 Concentration 0.06mol / L, CO 2 The desorption rate is 95.1%, and the average residence time of the absorbent in the throttling device is 7.2s.

Embodiment 2

[0051] The mass composition is 10%MDEA+50%NHD+40%H 2 Absorbent for O (initially loaded CO 2 Concentration is 0.786mol / L), using the PTFE hollow fiber membrane module with packing number n of 10, pore diameter of 0.65 μm, and porosity of 65% as the throttling element, the experimental device is as follows figure 2 shown. Operating conditions: differential pressure 70kPa (absolute pressure 100kPa on the upstream side of the throttling element (inside the hollow fiber tube), 30kPa absolute pressure on the downstream side (outside the hollow fiber tube)), regeneration temperature 60°C, absorbent flow rate 1.2L / h .

[0052] When the system reaches a steady state, detect the CO in the absorbent regeneration lean liquid flowing out from the absorbent regeneration lean liquid outlet 3-5 2 The concentration is 0.14mol / L, the desorption rate is 82.8%, and the average residence time of the absorbent in the throttling device is 6.3s.

Embodiment 3

[0054] The mass composition is 30%MDEA+30%NHD+40%H 2 Absorbent for O (initially loaded CO 2 Concentration is 2.01mol / L), using a metal sintered plate with a nominal pore diameter of 2μm and a hydraulic diameter of 4.8cm as the throttling element, the experimental device is as follows figure 1 shown. Operating conditions: pressure difference is 100kPa (absolute pressure on the upstream side of the throttling element is 200kPa, and absolute pressure on the downstream side is 100kPa), the regeneration temperature is 70°C, and the flow rate of the absorbent is 72L / h.

[0055] When the system reaches a steady state, detect the CO in the absorbent regeneration lean liquid flowing out from the absorbent regeneration lean liquid outlet 3-5 2 The concentration is 0.62mol / L, the desorption rate is 69.4%, and the average residence time of the absorbent in the throttling device is 0.1s.

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Abstract

The invention relates to a method using a throttling expansion principle to promote the regeneration of a carbon dioxide absorbent. The method comprises the following steps: step A, making an absorbent carrying CO2 go through the upstream side of the throttling element of a throttling device; step B, making the absorbent go through the channel in the throttling element to reach the downstream side under a certain pressure difference so as to regenerate the absorbent, wherein the regeneration barren liquor and CO2 gas are discharged from the regeneration barren liquor outlet and the CO2 gas outlet of the throttling device, and the absorbent that does not go through the throttling element is discharged from the absorbent residue outlet; and step c, individually collecting the barren liquor and CO2 gas. The method utilizes the throttling expansion principle. In the moment when the absorbent goes through the micro hole of throttling element, micro bubbles of CO2 that has just been desorbed are promoted to rapidly aggregate and expand in droplets of absorbent, thus the speed of separation between CO2 and absorbent is greatly improved, the stay time of absorbent in regeneration equipment is shortened to several seconds, moreover, the temperature during the regeneration process is reduced, and the regeneration energy consumption and absorbent loss are both reduced therefore.

Description

technical field [0001] The invention belongs to CO 2 The technical field of absorbent regeneration specifically relates to a method for promoting the regeneration of carbon dioxide absorbents by utilizing the principle of throttling and expansion. Background technique [0002] In the foreseeable future, carbon capture and storage (CCS) technology is still the only economically feasible way to solve the greenhouse gas problem. In CCS technology, the capture cost accounts for 80% of the entire operation cost, and the energy consumption of regeneration accounts for more than 1 / 2-2 / 3 of the energy consumption of the entire capture process. the key to. Post-combustion flue gas CO based on chemical absorption 2 Separation technology is the mainstream carbon capture method. The 2004 report of the IEA (International Energy Agency) pointed out that the CO in the absorbent exists in the traditional regeneration process 2 In the process of regeneration reaction and gas-liquid mass...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/14C01B32/50
CPCY02C20/40Y02P20/151
Inventor 张卫东邢津铭金显杭杨叶于天然马骞任钟旗杜乐
Owner BEIJING UNIV OF CHEM TECH
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