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CN-121988260-A - Continuous flow reaction system for photo-thermal coupling reduction of carbon dioxide

CN121988260ACN 121988260 ACN121988260 ACN 121988260ACN-121988260-A

Abstract

The invention discloses a continuous flow reaction system for photo-thermal coupling reduction of carbon dioxide, which belongs to the technical field of formic acid production and comprises a premixing device, a main body reactor, a purifying device and a storage device which are sequentially communicated through pipelines, wherein the main body reactor comprises an illumination heat absorption device and a reaction kettle body, the illumination heat absorption device is arranged above the reaction kettle body and is used for introducing light into the reaction kettle body and heating heat exchange liquid for providing heat for the reaction kettle body, a plurality of groups of tubular reactors are arranged in the center of the reaction kettle body, one ends of the plurality of groups of tubular reactors are communicated with a raw material inlet pipeline through tree-shaped multi-way pipes, the other ends of the tubular reactors are communicated with a finished product output pipeline through multi-way pipes, and one end of the finished product output pipeline penetrates through the outer side wall and the inner side wall of the reaction kettle body and is connected with an inlet of the purifying device. The invention is provided with a plurality of groups of parallel tubular reactors, so that the formic acid generation efficiency is greatly improved, and the tubular reactors and the optical fiber channels are arranged at intervals and matched with the arrangement of the reflecting layer, so that the light utilization rate is improved.

Inventors

  • JING JIEYING
  • MA RUIJIE
  • LIANG ZHUANZHUAN
  • LI WENYING

Assignees

  • 太原理工大学

Dates

Publication Date
20260508
Application Date
20260312

Claims (9)

  1. 1. A continuous flow reaction system for photo-thermal coupling reduction of carbon dioxide is characterized by comprising a premixing device (1), a main body reactor (2), a purifying device (3) and a storage device (4) which are sequentially communicated through pipelines; The main body reactor (2) comprises an illumination heat absorber (21) and a reaction kettle body (22), the illumination heat absorber (21) is arranged above the reaction kettle body (22) and used for introducing light into the reaction kettle body (22) and heating heat exchange liquid for providing heat for the reaction kettle body (22), a plurality of groups of tubular reactors (224) are arranged in the center of the inside of the reaction kettle body (22), one ends of the plurality of groups of tubular reactors (224) are communicated with a raw material inlet pipeline (225) through tree-shaped multi-way pipes, the other ends of the tubular reactors are communicated with a finished product output pipeline (226) through multi-way pipes, and one end of the finished product output pipeline (226) penetrates through the outer side wall and the inner side wall of the reaction kettle body (22) and is connected with an inlet of the purification device (3).
  2. 2. The continuous flow reaction system for photo-thermal coupling reduction of carbon dioxide according to claim 1, wherein the premixing device (1) comprises a premixing cavity (11) and an aeration device (12), the premixing cavity (11) is a sealed cavity filled with water, the aeration device (12) is arranged inside the premixing cavity (11) and is a high-pressure aeration device, one end of the aeration device is connected with a CO 2 raw material storage device, and the other end of the aeration device is used for aerating the premixing cavity (11).
  3. 3. The continuous flow reaction system for photo-thermal coupling reduction of carbon dioxide according to claim 1, wherein the illumination heat absorber (21) comprises a fresnel lens (211), a heat exchange liquid tank (212), an optical path channel (213) and an optical fiber channel (217), the fresnel lens (211) is installed above the heat exchange liquid tank (212), the optical path channel (213) is arranged at the center of the heat exchange liquid tank (212), the upper end of the optical path channel (213) faces the fresnel lens (211), and a reflecting layer is arranged on the inner side wall of the optical path channel (213) and used for guiding light into the reaction kettle (22) through a plurality of groups of optical fiber channels (217).
  4. 4. The continuous flow reaction system for photo-thermal coupling reduction of carbon dioxide according to claim 3, wherein the lower end of the optical fiber channel (217) extends into the reaction kettle body (22), a part of the outer side surface of the optical fiber channel (217) positioned outside the reaction kettle body (22) is entirely coated with a reflecting layer, a plurality of reflecting strips are axially coated on a part of the outer side surface of the optical fiber channel (217) positioned inside the reaction kettle body (22), the reflecting strips are uniformly arranged relative to the optical fiber channel (217) in the circumferential direction, and a reflecting layer (223) is arranged on the inner side of the inner side wall of the reaction kettle body (22).
  5. 5. The continuous flow reaction system for photo-thermal coupling reduction of carbon dioxide according to claim 3, wherein a heat collecting plate (214) is arranged on the upper end face of the heat exchange liquid tank (212), heat exchange liquid is contained in the heat exchange liquid tank (212), liquid inlet pipelines (215) are oppositely arranged on two sides of the heat exchange liquid tank (212), the other ends of the liquid inlet pipelines (215) are connected with the top of the reaction kettle body (22), a liquid return pipeline (216) is further arranged on the other side, located between the two groups of liquid inlet pipelines (215), of the heat exchange liquid tank (212), and the other ends of the liquid return pipelines are connected with the bottom of the reaction kettle body (22).
  6. 6. The continuous flow reaction system for photo-thermal coupling reduction of carbon dioxide according to claim 5, wherein an interlayer is arranged in the side wall of the reaction kettle body (22), the liquid inlet pipeline (215) and the liquid return pipeline (216) are both communicated with the interlayer, and an insulating layer (222) is arranged on the inner side of the outer side wall of the reaction kettle body (22).
  7. 7. The continuous flow reaction system for photo-thermal coupling reduction of carbon dioxide according to claim 1, wherein an atomizer (227) is arranged in a multi-way pipe connected to one end of the raw material inlet pipe (225) connected to the tubular reactor (224).
  8. 8. The continuous flow reaction system for photo-thermal coupling reduction of carbon dioxide according to claim 3, wherein a plurality of groups of tubular reactors (224) are uniformly arranged along the central line circumference of the reaction kettle body (22), a plurality of groups of optical fiber channels (217) are uniformly arranged along the central line circumference of the reaction kettle body (22), and the tubular reactors (224) and the optical fiber channels (217) are alternately arranged in concentric circles.
  9. 9. The continuous flow reaction system for photo-thermal coupling reduction of carbon dioxide according to claim 8, wherein a spiral catalyst adhesion belt (228) is further disposed inside the tubular reactor (224), and a catalyst is adhered to the catalyst adhesion belt (228).

Description

Continuous flow reaction system for photo-thermal coupling reduction of carbon dioxide Technical Field The invention belongs to the technical field of formic acid production, and particularly relates to a continuous flow reaction system for reducing carbon dioxide by photo-thermal coupling. Background The increasing emissions of CO 2, produced by industrial development and human activity, have severely affected the balance of the natural carbon circulation system. In order to solve the energy pollution problem, the catalyst is converted into chemical products such as CO, CH 4、CH3 OH, formic acid, dimethyl ether, olefin, aromatic hydrocarbon, other hydrocarbon and the like by utilizing a catalytic carbon dioxide reduction technology. Formic acid is used as one of basic organic chemical raw materials, and can be widely used in industries of pesticides, leather, dyes, medicines, rubber and the like, so that reduction of carbon dioxide into formic acid has very important significance. In order to obtain higher conversion rate and product yield under mild conditions, the photocatalysis and the thermocatalytic method are combined to cooperatively reduce CO 2 so as to achieve the purpose of improving the conversion rate and the selectivity. At present, the catalyst for preparing formic acid by photo-thermal catalytic CO 2 reduction mainly consists of a semiconductor, and still has the problems of narrow optical absorption area and extremely high electron-hole recombination speed in the semiconductor in the photo-reaction process, so that the effective electron utilization rate for activating CO 2 is reduced, the formic acid yield is lower, the reduction efficiency and the conversion rate of CO 2 of the reaction system are greatly limited due to the influence of the surface characteristics of the catalyst on CO 2 adsorption/activation and reduction in the thermal catalytic process, and the adsorption characteristics and the high photo-catalytic activity of the photo-thermal catalyst are difficult to match, so that the yield is lower. Therefore, improving the photo-thermal conversion efficiency is a problem that needs to be solved at present. Disclosure of Invention In view of the above, the invention provides a continuous flow reaction system for photo-thermal coupling reduction of carbon dioxide, which adopts the following technical scheme: A continuous flow reaction system for photo-thermal coupling reduction of carbon dioxide comprises a premixing device, a main body reactor, a purification device and a storage device which are sequentially communicated through pipelines, wherein the main body reactor comprises an illumination heat absorption device and a reaction kettle body, the illumination heat absorption device is arranged above the reaction kettle body and used for introducing light into the reaction kettle body and heating heat exchange liquid for providing heat for the reaction kettle body, a plurality of groups of tubular reactors are arranged in the center of the reaction kettle body, one ends of the plurality of groups of tubular reactors are communicated with a raw material inlet pipeline through tree-shaped multi-way pipes, the other ends of the tubular reactors are communicated with a finished product output pipeline through multi-way pipes, and one end of the finished product output pipeline penetrates through the outer side wall and the inner side wall of the reaction kettle body and is connected with an inlet of the purification device. The premixing device comprises a premixing cavity and an aeration device, wherein the premixing cavity is a sealed cavity, water is filled in the premixing cavity, the aeration device is arranged in the premixing cavity and is a high-pressure aeration device, one end of the aeration device is connected with a CO 2 raw material storage device, and the other end of the aeration device is used for aerating the premixing cavity. The light irradiation heat absorber comprises a heat exchange liquid tank, a light path channel and a fiber channel, wherein the light exchange liquid tank is arranged above the light exchange liquid tank, the fiber channel is arranged at the center of the heat exchange liquid tank, the upper end of the fiber channel faces the Fresnel lens, and a reflecting layer is arranged on the inner side wall of the fiber channel and used for guiding light rays into the reaction kettle body through a plurality of groups of fiber channels. The optical fiber channel is characterized in that the lower end of the optical fiber channel extends into the reaction kettle body, the part of the outer side surface of the optical fiber channel, which is positioned outside the reaction kettle body, is entirely coated with a reflecting layer, the part of the outer side surface of the optical fiber channel, which is positioned inside the reaction kettle body, is axially coated with a plurality of reflecting strips, the reflecting strips are uniformly arranged relative