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CN-122006626-A - Continuous flow photocatalytic gas-solid reaction reduction system and method

CN122006626ACN 122006626 ACN122006626 ACN 122006626ACN-122006626-A

Abstract

The invention discloses a continuous flow photocatalytic gas-solid reaction reduction system and a continuous flow photocatalytic gas-solid reaction reduction method, and belongs to the technical field of photocatalytic gas-solid reaction reduction. The gas activator of the system is independently arranged, and the inlet of the gas activator is connected with the outlet of the gas supply unit and is used for pre-activating the reaction gas; the first vacuum pump is connected with the outlet of the gas activator and the inlet of the photocatalytic gas-solid reactor, and the activated gas is conveyed to the photocatalytic gas-solid reactor, the outlet of the photocatalytic gas-solid reactor is divided into two paths, one path is connected with the product treatment unit for post treatment, the other path is connected with the product circulation pipeline, the outlet of the product circulation pipeline is divided into two paths, and the two paths respectively flow back to the inlet of the reactor through the first circulation pipeline and flow back to the inlet of the gas activator through the second circulation pipeline, so that the re-reaction and the re-activation of unreacted products are realized. The invention can improve the catalytic efficiency and the reactant utilization rate through independent preactivation and shunt circulation, thereby meeting the industrial requirements.

Inventors

  • YANG YANLING
  • XU KAIXUAN
  • CAO GUIBIN

Assignees

  • 陕西科技大学

Dates

Publication Date
20260512
Application Date
20260331

Claims (10)

  1. 1. The continuous flow photocatalytic gas-solid reaction reduction system is characterized by comprising a gas supply unit, a photocatalytic gas-solid reactor (22), a gas activator (21), a first vacuum pump (2-100), a product processing unit and a product circulation regulation and control component, wherein the product circulation regulation and control component comprises a product circulation pipeline (2-5), a first circulation pipeline (2-6) and a second circulation pipeline (2-7); The device comprises a gas activator (21), a first vacuum pump (2-100), a second vacuum pump (2-100), a photocatalytic gas-solid reactor (22), a product treatment unit, a product circulation pipeline (2-5) and a product recycling pipeline, wherein the inlet of the gas activator (21) is connected with the outlet of the gas supply unit and is used for independently pre-activating reaction gas; The outlet of the product circulation pipeline (2-5) is divided into two paths, wherein the first path is connected to the inlet of the photocatalytic gas-solid reactor (22) through a first circulation pipeline (2-6) and used for circulating the product back to the photocatalytic gas-solid reactor (22), and the second path is connected to the inlet of the gas activator (21) through a second circulation pipeline (2-7) and used for conveying the product back to the gas activator (21) for reactivation.
  2. 2. The continuous flow photocatalytic gas-solid reaction reduction system according to claim 1, wherein the gas supply unit comprises a first pipe (1-1), a second pipe (2-1), a third pipe (3-1), a fourth pipe (4-1), a fifth pipe (5-1) and a steam evaporation unit, wherein the inlet of the first pipe (1-1) is communicated with an Ar gas source, the outlet of the first pipe (1-1) is communicated with the second pipe (2-1), the inlet of the second pipe (2-1) is communicated with a CO 2 gas source, the outlet of the second pipe (2-1) is communicated with the inlet of the gas activator (21) as the outlet of the gas supply unit, the inlet of the third pipe (3-1) is communicated with an N 2 gas source, the outlet of the third pipe (3-1) is communicated with the second pipe (2-1), the inlet of the fourth pipe (4-1) is communicated with an H 2 gas source, the outlet of the fourth pipe (4-1) is communicated with the second pipe (2-1), the inlet of the fifth pipe (5-1) is communicated with the inlet of the H 2 to the steam evaporation unit through the first pump (100-100).
  3. 3. The continuous flow photocatalytic gas-solid reaction reduction system according to claim 2, wherein the water vapor generation unit comprises an evaporator (51) and a fourth vacuum pump (5-100), the outlet of the fifth pipeline (5-1) is communicated with the inlet of the first vacuum pump (2-100) through the evaporator (51) and the fourth vacuum pump (5-100) in sequence, and the inlet of the evaporator (51) is provided with a second heater (51-1).
  4. 4. A continuous flow photocatalytic gas-solid reaction reduction system according to claim 3, characterized in that the water vapor generating unit further comprises a circulation line I (2-2), a circulation line II (2-3), a gas circulator (2-31) and a three-way valve (2-32), the fourth vacuum pump (5-100) is communicated to an inlet of the three-way valve (2-32) through the circulation line I (2-2), a first outlet of the three-way valve (2-32) is communicated to an inlet of the first vacuum pump (2-100) through the circulation line II (2-3), and a second outlet of the three-way valve (2-32) is communicated to an inlet of the first vacuum pump (2-100) through the gas circulator (2-31).
  5. 5. The continuous flow photocatalytic gas-solid reaction reduction system according to claim 1, wherein the product processing unit comprises a peristaltic pump (23), a dryer (24) and a sampler (25) which are connected in sequence, and an inlet of the peristaltic pump (23) is communicated with an outlet of the photocatalytic gas-solid reactor (22).
  6. 6. The continuous flow photocatalytic gas-solid reaction reduction system according to claim 1, wherein the product circulation regulating and controlling assembly further comprises a second vacuum pump (2-200) and a third vacuum pump (2-300), wherein the outlet of the product circulation pipeline (2-5) is divided into two paths by the second vacuum pump (2-200), the first path is connected with the inlet of the first circulation pipeline (2-6), and the second path is connected with the inlet of the second circulation pipeline (2-7) by the third vacuum pump (2-300).
  7. 7. The continuous flow photocatalytic gas-solid reaction reduction system according to claim 1, wherein the continuous flow photocatalytic gas-solid reaction reduction system further comprises a multistage pressure control unit comprising: the first pressure measurement control pipeline (21-2) is communicated with the gas activator (21), and a first pressure valve (21-21), a first evacuation valve (21-22) and a first evacuation valve (21-23) are respectively arranged on the first pressure measurement control pipeline (21-2); the second pressure measurement control pipeline (22-3) is communicated with the photocatalytic gas-solid reactor (22), and a second pressure valve (22-31), a second evacuating valve (22-32) and a second evacuating valve (22-33) are respectively arranged on the second pressure measurement control pipeline (22-3); the third pressure measurement control pipeline (2-41) is communicated with a pipeline connecting the photocatalytic gas-solid reactor (22) and the product processing unit, and a third pressure valve (2-411), a third evacuation valve (2-412) and a third evacuation valve (2-413) are respectively arranged on the third pressure measurement control pipeline (2-41); And the fourth pressure measurement control pipeline (51-2) is communicated with the steam generation unit, and a fourth pressure valve (51-21), a fourth evacuation valve (51-22) and a fourth evacuation valve (51-23) are respectively arranged on the fourth pressure measurement control pipeline (51-2).
  8. 8. The continuous-flow photocatalytic gas-solid reaction reduction system according to claim 1, wherein a cooling circulator for controlling the reaction temperature is connected to the photocatalytic gas-solid reactor (22).
  9. 9. A continuous flow photocatalytic gas-solid reaction reduction system according to claim 1, characterized in that the inlet of the gas activator (21) is provided with a first heater (21-1).
  10. 10. A continuous flow photocatalytic gas-solid reaction reduction method, characterized in that the continuous flow photocatalytic gas-solid reaction reduction system according to any one of claims 1 to 9 is adopted, comprising the steps of: introducing a reaction gas into a gas activator (21) through a gas supply unit to perform independent preactivation; Delivering the activated gas to a photocatalytic gas-solid reactor (22) loaded with a solid catalyst by a first vacuum pump (2-100) for gas-solid reaction; And one part of the reacted product enters a product treatment unit for post-treatment, the other part of the product is divided into two paths, one path enters a photocatalytic gas-solid reactor (22) for re-reaction through a product circulation pipeline (2-5) and a first circulation pipeline (2-6), and the other path enters a gas activator (21) for re-activation through the product circulation pipeline (2-5) and a second circulation pipeline (2-7).

Description

Continuous flow photocatalytic gas-solid reaction reduction system and method Technical Field The invention relates to the technical field of photocatalytic gas-solid reaction reduction, in particular to a continuous flow photocatalytic gas-solid reaction reduction system and a continuous flow photocatalytic gas-solid reaction reduction method. Background The photocatalytic gas-solid reaction reduction technology has the prominent advantages of environmental protection, mild reaction conditions (high temperature and high pressure are not needed), low energy consumption, capability of realizing high-value conversion of resources and the like, has wide application prospect in the fields of energy conversion (such as CO 2 reduction, photocatalytic hydrogen production), environmental management and the like, and becomes a focus direction of research hot spot and industrialized popularization in recent years. The technology has the core that the photocatalysis is utilized to drive gaseous reactants and the solid catalyst to carry out reduction reaction, so that harmless treatment of pollutants or synthesis of energy materials are realized, and compared with the traditional thermocatalytic technology, the technology can effectively avoid the problems of secondary carbon emission and secondary pollution, and meets the requirement of sustainable development. At present, industrial application of the photocatalytic gas-solid reaction reduction technology still faces a plurality of key bottlenecks, wherein unreasonable structural design of a reaction system is one of core factors for limiting catalytic efficiency, stability and large-scale application. In the existing photocatalysis gas-solid reaction process, a design mode that gas activation and gas-solid reaction are integrated in a single device is generally adopted, the gas activation process and the gas-solid reaction process are not effectively separated, an independent gas pre-activation unit and a reasonable material circulation mechanism are lacked, because the gas activation and the gas-solid reaction are completed in the same device, the activated gas is not fully pre-activated and intensified and uniformly dispersed and directly enters a reaction zone to contact with a solid catalyst, the contact area between the reaction gas and the surface of the catalyst is limited, the overall catalytic efficiency is low, the efficiency requirement of industrial production is difficult to meet, in addition, the existing system is lack of an effective product circulation regulation mechanism, the reaction product cannot be reasonably recycled and reutilized, and the utilization rate of the reactant is reduced because part of the gas product which is not fully reacted is directly discharged. Therefore, how to improve the catalytic efficiency and the reactant utilization of the photocatalytic gas-solid reaction reduction system has become a technical problem to be overcome by those skilled in the art. Disclosure of Invention The invention aims to provide a continuous flow photocatalytic gas-solid reaction reduction system and a continuous flow photocatalytic gas-solid reaction reduction method, so as to solve the problems that the catalytic efficiency in the traditional process is difficult to meet the industrial requirement and the reactant utilization rate is low. The invention solves the technical problems by the following technical proposal: The invention provides a continuous flow photocatalytic gas-solid reaction reduction system which comprises a gas supply unit, a photocatalytic gas-solid reactor, a gas activator, a first vacuum pump, a product treatment unit and a product circulation regulation and control component, wherein the product circulation regulation and control component comprises a product circulation pipeline, a first circulation pipeline and a second circulation pipeline, an inlet of the gas activator is connected with an outlet of the gas supply unit and is used for independently preactivating reaction gas, an inlet of the first vacuum pump is connected with an outlet of the gas activator, an outlet of the first vacuum pump is connected with an inlet of the photocatalytic gas-solid reactor and is used for conveying activated gas to the photocatalytic gas-solid reactor, an outlet of the photocatalytic gas-solid reactor is divided into two paths, the first path is connected with an inlet of the product treatment unit and is used for carrying out aftertreatment on reaction products, the second path is connected with an inlet of the product circulation pipeline and is divided into two paths, the first path is connected with an inlet of the photocatalytic gas-solid reactor through the first circulation pipeline and is used for recycling the product to the photocatalytic gas-solid reactor, and the second path is connected with an inlet of the gas activator through the second circulation pipeline and is used for conveying the product to the photocatalyti