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CN-121972104-A - Coupling direct air capture CO2Aromatic hydrocarbon synthesis system of (2)

CN121972104ACN 121972104 ACN121972104 ACN 121972104ACN-121972104-A

Abstract

The invention provides an aromatic hydrocarbon synthesis system for coupling direct air capture CO 2 , which realizes heat energy recycling through arranging a heat exchanger, reduces the dependence of a calciner on external energy sources, and reduces the use of non-renewable energy sources (such as natural gas), thereby pushing energy sources to transform and reducing production cost. The heat exchanger also effectively reduces heat loss in the system and improves the utilization efficiency of the whole energy.

Inventors

  • ZHANG CHENXI
  • WEI FEI
  • HOU XIAOYUN
  • LI ZONGLONG
  • Xing Shushu
  • SHI JIAN

Assignees

  • 鄂尔多斯实验室
  • 清华大学

Dates

Publication Date
20260505
Application Date
20251216

Claims (10)

  1. 1. An aromatics synthesis system coupled to direct air capture CO 2 , the system comprising: An air catcher (1), a first reactor (2), a calciner (3), an electrolyzer (4), a heat exchanger (5) and a second reactor (6); The outlet of the air catcher (1) is connected with the input port (21) of the first reactor (2), and the output port (22) of the first reactor (2) is connected with the inlet of the calciner (3); The outlet of the electrolysis device (4) is connected with a first outlet pipeline (41), the outlet of the calciner (3) is connected with the first outlet pipeline (41), one end, far away from the electrolysis device (4), of the first outlet pipeline (41) is connected with a first inlet (51) of the heat exchanger (5), the outlet of the heat exchanger (5) is connected with the second reactor (6), and a second inlet (52) of the heat exchanger (5) is connected with the calciner (3); Wherein the air capture device (1) stores a capture agent inside, the air capture device (1) is configured to capture CO 2 in air with the capture agent to obtain carbonate and water; The first reactor (2) has Ca (OH) 2 stored inside, the first reactor (2) being configured to react the carbonate with the Ca (OH) 2 to obtain CaCO 3 and the scavenger; -the calciner (3) is configured to calcine the CaCO 3 entering the calciner (3) at a temperature of more than 800 ℃ obtaining CO 2 and CaO; The electrolysis device (4) is used for electrolyzing water to obtain hydrogen and discharging the hydrogen into the first outlet pipeline (41) along the outlet of the electrolysis device (4); -said first outlet conduit (41) configured to send CO 2 discharged from the outlet of said calciner (3) and hydrogen discharged from the outlet of said electrolyser (4) along said first inlet (51) to said heat exchanger (5); A heat storage medium is stored in the heat exchanger (5), the heat exchanger (5) is configured to exchange heat between the heat storage medium and the CO 2 and between the heat storage medium and the hydrogen, the CO 2 and the hydrogen are conveyed into the second reactor (6) after being cooled, the heat storage medium is conveyed into the calciner (3) along the second inlet (52) after being heated, and the heat storage medium is configured to heat the calciner (3); The second reactor (6) is configured to perform an aromatic hydrocarbon synthesis reaction on the CO 2 and the hydrogen to obtain an organic mixture, wherein the organic mixture comprises an aromatic hydrocarbon component, a light hydrocarbon component, water and coke.
  2. 2. The coupled direct air capture CO 2 aromatic hydrocarbon synthesis system of claim 1, wherein the heat storage medium is any one of magnesium oxide particles, aluminum oxide particles, quartz sand particles; the heat storage medium heats the calciner (3) to 400-500 ℃.
  3. 3. The coupled direct air capture CO 2 aromatics synthesis system according to claim 1, wherein said system further comprises a heating device (31); the heating device (31) comprises an arc heater (311); the arc heater (311) is connected to the calciner (3), the arc heater (311) being configured to be powered with a renewable energy source to heat the CaCO 3 ; wherein the renewable energy source is any one of solar energy, wind energy and biomass energy.
  4. 4. The coupled direct air capture CO 2 aromatics synthesis system according to claim 1, wherein said system further comprises a synthesizer (7); a first inlet (71) of the synthesizer (7) is connected with the air catcher (1), a second inlet (72) of the synthesizer (7) is connected with the calciner (3), and an outlet of the synthesizer (7) is connected with the first reactor (2); -the synthesizer (7) is configured to mix water discharged from the first inlet (71) with the CaO discharged from the second inlet (72), react to obtain Ca (OH) 2 , and convey the Ca (OH) 2 to the first reactor (2) for reuse.
  5. 5. The coupled direct air capture CO 2 aromatic hydrocarbon synthesis system of claim 1 wherein the capture agent is NaOH or KOH.
  6. 6. The coupled direct air capture CO 2 aromatic hydrocarbon synthesis system of claim 1, wherein the temperature of CO 2 obtained by calcining the CaCO 3 is 800 ℃ to 1000 ℃.
  7. 7. The aromatic hydrocarbon synthesis system coupled with direct air capture CO 2 according to claim 1, wherein the temperature of hydrogen obtained by electrolysis of water by the electrolysis device (4) is 600 ℃ to 850 ℃.
  8. 8. The coupled direct air capture CO 2 aromatics synthesis system according to any one of claims 1-7, wherein the system further comprises a separator (8); The outlet of the second reactor (6) is connected with a second outlet pipeline (61), and the inlet of the separator (8) is connected with one end of the second outlet pipeline (61) far away from the second reactor (6); The separator (8) is configured to separate the CO 2 and the hydrogen mixed in the organic mixture.
  9. 9. The aromatic hydrocarbon synthesis system coupled with the direct air capture CO 2 according to claim 8, wherein the outlet of the separator (8) is connected with a third outlet pipeline (81), and a rectifying tower (811) is arranged on the third outlet pipeline (81); the rectifying tower (811) is connected with one end of the third outlet pipeline (81) far away from the separator (8); The rectifying tower (811) is configured to carry out rectification treatment on the separated organic mixture so as to obtain aromatic hydrocarbon containing C 6-8 components at the top of the tower, obtain aromatic hydrocarbon containing more than C 9 components at the bottom of the tower, and output the aromatic hydrocarbon containing more than C 9 components as a product to the rectifying tower (811).
  10. 10. The coupled direct air capture CO 2 aromatics synthesis system according to claim 9, wherein the outlet of the rectification column (811) is connected to the second reactor (6) by a pipe; The rectifying column (811) is further configured to send the aromatic hydrocarbon containing the C 6-8 component into the second reactor (6) for recycling.

Description

Aromatic hydrocarbon synthesis system capable of capturing CO 2 through coupling direct air Technical Field The application relates to the technical field of direct air capture CO 2, in particular to an aromatic hydrocarbon synthesis system for coupling direct air capture CO 2. Background The CO 2 capture technology mainly involves decarbonization of fossil fuels prior to combustion or separation of CO 2 from combustion flue gases. However, in view of the increased emissions from transportation and other distributed sources, capturing CO 2 from ambient air is necessary to achieve stabilization of the global CO 2 concentration in the atmosphere. Currently, many methods of Direct Air Capture (DAC) technology have been implemented, primarily limited by the high energy costs involved, with heat being provided primarily by natural gas combustion, resulting in significant heat loss at the preheater, cyclone, calciner, and other process components. The use of non-renewable energy sources, namely natural gas, also faces the limitations of resources, environment, economy, safety and the like. To cope with these problems, it is necessary to accelerate the transition to renewable energy and clean energy and reduce energy consumption by pushing energy conversion. Disclosure of Invention In order to solve the problems, the invention provides an aromatic hydrocarbon synthesis system for directly capturing CO 2 through coupling air, which realizes heat energy recycling through arranging a heat exchanger, reduces the dependence of a calciner on external energy sources, and reduces the use of non-renewable energy sources (such as natural gas), thereby pushing energy source transformation and reducing energy cost. The heat exchanger also effectively reduces heat loss in the system and improves the utilization efficiency of the whole energy. The system not only realizes the capture of CO 2, but also converts the CO 2 into a valuable aromatic hydrocarbon mixture through chemical reaction, thereby realizing the recycling utilization of CO 2. The whole system reduces the emission of CO 2, and is beneficial to environmental protection and sustainable development. The invention provides an aromatic hydrocarbon synthesis system coupled with direct air capture CO 2, which comprises: An air catcher (1), a first reactor (2), a calciner (3), an electrolyzer (4), a heat exchanger (5) and a second reactor (6); The outlet of the air catcher (1) is connected with the input port (21) of the first reactor (2), and the output port (22) of the first reactor (2) is connected with the inlet of the calciner (3); The outlet of the electrolysis device (4) is connected with a first outlet pipeline (41), the outlet of the calciner (3) is connected with the first outlet pipeline (41), one end, far away from the electrolysis device (4), of the first outlet pipeline (41) is connected with a first inlet (51) of the heat exchanger (5), the outlet of the heat exchanger (5) is connected with the second reactor (6), and a second inlet (52) of the heat exchanger (5) is connected with the calciner (3); Wherein the air capture device (1) stores a capture agent inside, the air capture device (1) is configured to capture CO 2 in air with the capture agent to obtain carbonate and water; The first reactor (2) has Ca (OH) 2 stored inside, the first reactor (2) being configured to react the carbonate with the Ca (OH) 2 to obtain CaCO 3 and the scavenger; -the calciner (3) is configured to calcine the CaCO 3 entering the calciner (3) at a temperature of more than 800 ℃ obtaining CO 2 and CaO; The electrolysis device (4) is used for electrolyzing water to obtain hydrogen and discharging the hydrogen into the first outlet pipeline (41) along the outlet of the electrolysis device (4); -said first outlet conduit (41) configured to send CO 2 discharged from the outlet of said calciner (3) and hydrogen discharged from the outlet of said electrolyser (4) along said first inlet (51) to said heat exchanger (5); A heat storage medium is stored in the heat exchanger (5), the heat exchanger (5) is configured to exchange heat between the heat storage medium and the CO 2 and between the heat storage medium and the hydrogen, the CO 2 and the hydrogen are conveyed into the second reactor (6) after being cooled, the heat storage medium is conveyed into the calciner (3) along the second inlet (52) after being heated, and the heat storage medium is configured to heat the calciner (3); The second reactor (6) is configured to subject the CO 2 and the hydrogen to an aromatic hydrocarbon synthesis reaction to obtain an organic mixture, wherein the organic mixture comprises an aromatic hydrocarbon component, a light hydrocarbon component, water and coke. Optionally, the heat storage medium is any one of magnesia particles, alumina particles and quartz sand particles; the heat storage medium heats the calciner (3) to 400-500 ℃. Optionally, the system further comprises heating means (31); the