CN217768288U - Photocatalytic plasma reactor - Google Patents

Abstract

The application relates to the technical field of chemical reaction devices, and particularly discloses a photocatalytic plasma reactor which comprises an outer sleeve, wherein one end of the outer sleeve is fixedly connected with a reaction gas inlet joint, and the other end of the outer sleeve is fixedly connected with a reaction gas outlet joint; an inner sleeve is inserted in the outer sleeve along the axial direction of the outer sleeve, and two ends of the inner sleeve extend out of the outer sleeve; an electrode is inserted into one end of the inner sleeve; a gap is formed between the inner wall of the outer sleeve and the outer peripheral surface of the inner sleeve, and the gap forms an airflow channel for communicating the reaction gas inlet joint and the reaction gas outlet joint; the outer sleeve is provided with a light-transmitting part, and a photocatalyst is arranged in a gap between the outer sleeve and the inner sleeve and is positioned at the light-transmitting part; a light-transmitting conductive structure is arranged on the peripheral surface of the outer sleeve at the light-transmitting part; and a power supply is connected between the electrode and the conductive structure. The reactor in the application can realize the synergistic reaction of light, heat and plasma, and expands the field of chemical research.

Description

Photocatalytic plasma reactor

Technical Field

The application relates to the technical field of chemical reaction devices, in particular to a photocatalytic plasma reactor.

Background

Plasma (plasma), also called plasma, is an ionized gaseous substance consisting of atoms from which part of electrons are deprived and positive and negative ions generated by ionizing radicals, and the total charges of anions and cations in the whole system of the plasma are equal, so the plasma is called plasma; plasma is a fourth state of matter different from solid, liquid and gas. The plasma has higher energy than the gas and exhibits properties that are not possessed by the general gases. Electrons and positive ions generated by gas ionization are generally combined in a short time and return to a neutral molecular state, and a part of energy of electrons and ions generated in this process is consumed in different forms such as electromagnetic waves, and radicals are often generated by molecular dissociation, and the generated electrons are combined with neutral atoms, and molecules form negative ions. Thus, the entire plasma is a mixture of electron excited atoms, and radicals. Because various chemical reactions are carried out in a highly excited state, the method is completely different from the classical chemical reaction. This generally changes the nature of the atoms or molecules in the plasma, and even a relatively stable inert gas becomes chemically very reactive.

Plasma chemistry is an emerging cross-science that developed in the sixties of the twentieth century. Through more than forty years of research and development, the method is widely applied to different fields such as chemical industry, metallurgy, machinery, textile, electronics, energy, semiconductors, medicines and the like.

The photocatalytic reaction is a chemical reaction that proceeds under the action of light. The photocatalytic principle is based on the oxidation-reduction capability of a photocatalyst under the condition of illumination, and in general, the photocatalytic reaction takes a semiconductor as a catalyst and takes light as energy, so that the aims of purifying pollutants, synthesizing and converting substances and the like can be fulfilled.

In addition, the high-temperature environment is formed by heating, the energy of the substance can be improved, the original stable structure of the substance is destroyed, the chemical reaction is more violent,

at present, the ionization generating plasma process and the photocatalysis process are usually carried out separately in different devices, and the relevance and the combined action cannot be deeply researched.

SUMMERY OF THE UTILITY MODEL

In order to realize the synergistic catalytic effect of the plasma, the light and the heat, the chemical research field is expanded. The present application provides a photocatalytic plasma reactor.

The application provides a photocatalysis plasma reactor adopts following technical scheme:

a photocatalytic plasma reactor comprises an outer sleeve which can be placed in a heating furnace, wherein one end of the outer sleeve is fixedly connected with a reaction gas inlet joint, and the other end of the outer sleeve is fixedly connected with a reaction gas outlet joint; an inner sleeve is inserted in the outer sleeve along the axial direction of the outer sleeve, and two ends of the inner sleeve extend out of the outer sleeve; an electrode is inserted into one end of the inner sleeve; a gap is formed between the inner wall of the outer sleeve and the outer peripheral surface of the inner sleeve, and the gap forms an airflow channel for communicating the reaction gas inlet joint and the reaction gas outlet joint; the outer sleeve is provided with a light-transmitting part, and a photocatalyst is arranged in a gap between the outer sleeve and the inner sleeve and is positioned at the light-transmitting part; a light-transmitting conductive structure is arranged on the peripheral surface of the outer sleeve at the light-transmitting part; and a power supply is connected between the electrode and the conductive structure.

The photocatalytic plasma reactor is matched with a heating furnace for use, and the heating furnace can adopt a common chemical reaction heating furnace on the market; the heating furnace can provide a high-temperature environment for the photocatalytic plasma reactor as a main source of heat, and meanwhile, part of heat is generated by light; when in use, the photocatalytic plasma reactor is placed in a heating furnace, and the temperature in the furnace is controlled to be 450-500 ℃; the reaction gas enters the gas flow channel from the reaction gas inlet joint, flows through the photocatalytic area and is discharged from the reaction gas outlet joint under the normal pressure condition; the power supplies power between to electrode and the conducting structure, when applyiing enough high alternating voltage on the discharge electrode, the gas between the electrode is punctured and forms dielectric barrier discharge, forms barrier discharge plasma, and light can see through conducting structure and shine on the catalyst simultaneously in this application, takes place the photocatalytic reaction, and multiple effect makes chemical reaction rate promote greatly. By adopting the technical scheme, the reactor realizes the synergistic reaction of light, heat and plasma, and expands the field of chemical research.

Optionally, a thermocouple is inserted into the other end of the inner sleeve, an induction end of the thermocouple extends to the electrode, and a connection end of the thermocouple extends out of the inner sleeve.

By adopting the technical scheme, the temperature in the chemical reaction area can be accurately measured by utilizing the thermocouple, so that the temperature can be accurately controlled, and the parameter accuracy of the synergistic reaction of light, heat and plasma can be improved.

Optionally, the thermocouple is arranged coaxially with the electrode; the middle part of the inner sleeve is provided with a plugging part which insulates and isolates the end part of the electrode inserted into the inner sleeve from the induction end of the thermocouple.

Furthermore, the plugging part and the body of the inner sleeve are made of the same material, and the plugging part and the body can be integrally formed; by adopting the technical scheme, the electrode and the thermocouple are isolated in a full-insulated mode, the size of the electrode and the size of the thermocouple are far away, the thermocouple can represent the temperature of a reaction zone, and the electrode and the thermocouple are not interfered mutually.

Optionally, the conductive structure is a metal mesh or a transparent conductive coating.

Through adopting above-mentioned technical scheme, adopt metal mesh or transparent conductive coating can with the electrode between produce voltage, the dissociation waits to react gas, generate plasma, can not cause interference influence to the light catalytic reaction simultaneously for plasma can directly participate in near light catalytic reaction.

Optionally, the conductive structure is a copper mesh.

By adopting the technical scheme, the copper mesh is adopted as the conductive structure, so that the manufacturing and the installation are convenient, the manufacturing cost is low, and the conductive performance is good.

Optionally, the outer sleeve and the inner sleeve are coaxially arranged; the outer sleeve and the inner sleeve are both made of quartz tubes.

The quartz tube has high purity, no graphite and good insulation. By adopting the technical scheme, the electrode can be effectively protected.

Optionally, the reaction gas air inlet joint adopts the tetrafluoro joint, the reaction gas air inlet joint passes through tetrafluoro O type circle and the one end sealing connection of outer tube, one side of reaction gas air inlet joint has the air inlet, interior sheathed tube one end is passed the reaction gas air inlet joint stretches into in the outer tube.

Through adopting above-mentioned technical scheme, adopt the reaction gas air inlet joint that tetrafluoro joint made, corrosion-resistant, the quality is slim and graceful and form sealing connection with the outer tube easily.

Optionally, the reaction gas is given vent to anger and is connected also to adopt the tetrafluoro to connect, one side that the reaction gas is given vent to anger and is connected has the gas outlet, the reaction gas is given vent to anger and is connected through tetrafluoro O type circle and the other end sealing connection of outer tube, the reaction gas give vent to anger the gas outlet on the joint with the last air inlet of reaction gas air-inlet joint is located same one side of outer tube, interior sheathed tube other end passes the reaction gas is given vent to anger and is connected.

This photocatalysis plasma reactor is vertical when using and is placed, and reaction gas air-inlet joint is located the upper end of outer tube, and the reaction gas is given vent to anger the lower extreme that connects to be located the outer tube for reaction gas admits air from the top of outer tube, and the bottom is given vent to anger, reduces reaction gas's flow velocity, makes it fully react.

Optionally, the light-transmitting part is located in the middle of the outer sleeve or at a position close to the reactant gas inlet joint, and the length of the light-transmitting part is 1/5-1/2 of the length of the whole outer sleeve; the end face of the electrode inserted into the inner sleeve is positioned in the area between the two ends of the light-transmitting part.

The area corresponding to the light-transmitting part is filled with photocatalyst, as a preferred scheme, the length of the light-transmitting part is 1/3 of the length of the whole outer sleeve, by adopting the technical scheme, the electrode directly acts on reaction gas in a reaction area to generate plasma, and the plasma immediately participates in photocatalytic reaction, so that the efficiency and the accuracy are high; the plasma that this application can maximize utilization electrode produced to satisfy the user demand and sexual valence relative altitude.

Optionally, the photocatalyst is one or more of titanium dioxide, zinc oxide, tin oxide, zirconium dioxide and cadmium sulfide.

Titanium dioxide is preferred in the application, and the technical scheme can be adopted to realize the photocatalytic reaction efficiently.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the reactor in the application can realize the synergistic reaction of light, heat and plasma, and expands the chemical research field.

2. Adopt the dielectric barrier discharge mode to form and block discharge plasma in this application, electrode and reactant gas direct contact not to can greatly reduced reactant gas to the corrosive action of electrode, improve the life of electrode.

3. The inner sleeve is coaxially fixed up and down in the application, so that a gap between the positive electrode and the negative electrode is fixed, and a stable plasma layer can be formed.

4. Insulating layer, middle shutoff portion, the thermocouple sleeve pipe material of electrode are the same in this application (all adopt the interior sleeve pipe of quartz material), and integrated into one piece makes reactor simple structure, and easy dismounting has reduced the scientific research cost.

5. Plasma's chemical property is active in this application, combines with the photocatalytic reaction, can also place simultaneously in the heating furnace through the further promotion material liveness of high temperature to promote chemical reaction rate greatly, it is more high-efficient.

Drawings

FIG. 1 is a schematic view of the structure of the photocatalytic plasma reactor.

FIG. 2 is a schematic cross-sectional view of the photocatalytic plasma reactor.

FIG. 3 is a schematic diagram of a partially enlarged structure of the photocatalytic plasma reactor.

In the figure, 1, an outer sleeve; 1a, a light-transmitting portion; 2. a reaction gas inlet joint; 2a, an air inlet; 3. a reaction gas outlet joint; 3a, an air outlet; 4. an inner sleeve; 4a, a sealing part; 5. an electrode; 6. an air flow channel; 7. a photocatalyst; 8. a conductive structure; 9. a power source; 10. and a thermocouple.

Detailed Description

The present application will be described in further detail below with reference to fig. 1 to 3.

The present embodiment discloses a photocatalytic plasma reactor; referring to fig. 1, the photocatalytic plasma reactor comprises an outer sleeve 1 which can be placed in a heating furnace, wherein one end of the outer sleeve 1 is fixedly connected with a reaction gas inlet connector 2, and the other end of the outer sleeve 1 is fixedly connected with a reaction gas outlet connector 3; an inner sleeve 4 is inserted in the outer sleeve 1 along the axial direction of the outer sleeve, and two ends of the inner sleeve 4 extend out of the outer sleeve 1; the outer sleeve 1 and the inner sleeve 4 are coaxially arranged; the outer sleeve 1 and the inner sleeve 4 are both made of quartz tubes; an electrode 5 is inserted into one end of the inner sleeve 4, and a thermocouple 10 is inserted into the other end of the inner sleeve 4.

Referring to fig. 2, the sensing end of the thermocouple 10 extends to the electrode 5, and the connection end of the thermocouple 10 extends out of the inner sleeve 4; a gap is formed between the inner wall of the outer sleeve 1 and the outer peripheral surface of the inner sleeve 4, and the gap forms an airflow channel 6 for communicating the reaction gas inlet joint 2 and the reaction gas outlet joint 3; the outer sleeve 1 is provided with a light transmission part 1a, a photocatalyst 7 is arranged in a gap between the outer sleeve 1 and the inner sleeve 4, and the photocatalyst 7 is positioned at the light transmission part 1 a; the photocatalyst 7 is one or more of titanium dioxide, zinc oxide, tin oxide, zirconium dioxide and cadmium sulfide; a layer of transparent conductive structure 8 is arranged on the peripheral surface of the outer sleeve 1 at the position of the transparent part 1 a; a power supply 9 is connected between the electrode 5 and the conductive structure 8.

Further, referring to fig. 3, the thermocouple 10 is disposed coaxially with the electrode 5; the inner sleeve 4 is of a hollow structure, the middle part of the inner sleeve 4 is provided with a blocking part 4a, so that two ends of the inner part of the inner sleeve 4 are not communicated, the electrode 5 and the thermocouple 10 are respectively inserted at two ends of the inner sleeve 4, and the electrode 5 and the end part of the thermocouple 10 are isolated in an insulating way through the blocking part 4 a; the plugging part 4a and the body of the inner sleeve 4 are made of the same material, and the two parts can be integrally formed; namely, the electrode 5 and the thermocouple 10 are isolated in a fully insulated mode, the two are far away from each other in size, the thermocouple 10 can represent the temperature of a reaction zone, and the electrode 5 and the thermocouple 10 are not interfered mutually and are not affected.

Referring to fig. 1 and 2, the light transmission part 1a is located at the middle of the outer sleeve 1 or a position close to the reactant gas inlet joint 2, the length of the light transmission part 1a is 1/5 to 1/2 of the length of the whole outer sleeve 1, and preferably, the length of the light transmission part 1a is 1/3 of the length of the whole outer sleeve 1; the end surface of the electrode 5 inserted into the inner tube 4 is located in the region between the two ends of the light-transmitting portion 1 a.

The conductive structure 8 in this application is a metal mesh or a transparent conductive coating; the metal mesh or the transparent conductive coating can generate voltage with the electrode 5, dissociate the gas to be reacted to generate plasma, and meanwhile, interference influence on the photo-catalytic reaction can not be caused, so that the plasma can directly participate in the photo-catalytic reaction nearby. As a preferable scheme, the conductive structure 8 in this embodiment is preferably a copper mesh, and the copper mesh is used as the conductive structure 8, so that the manufacturing and installation are convenient, the manufacturing cost is low, and the conductivity is good.

In the embodiment, a reaction gas inlet joint 2 and a reaction gas outlet joint 3 both adopt tetrafluoro joints, the reaction gas inlet joint 2 is hermetically connected with one end part of an outer sleeve 1 through a tetrafluoro O-shaped ring, and the reaction gas outlet joint 3 is hermetically connected with the other end part of the outer sleeve 1 through another tetrafluoro O-shaped ring; referring to fig. 1, one side of the reaction gas inlet connector 2 has a gas inlet 2a, one side of the reaction gas outlet connector 3 has a gas outlet 3a, the gas outlet 3a of the reaction gas outlet connector 3 and the gas inlet 2a of the reaction gas inlet connector 2 are located on the same side of the outer sleeve 1, and one end of the inner sleeve 4 passes through the reaction gas inlet connector 2 and extends into the outer sleeve 1, and then passes out of the reaction gas outlet connector 3.

The implementation principle is as follows: the photocatalytic plasma reactor is matched with a heating furnace for use, and the heating furnace can adopt a common chemical reaction heating furnace on the market; the heating furnace can provide a high-temperature environment for the photocatalytic plasma reactor as a main source of heat, and meanwhile, part of heat is generated by light; when in use, the photocatalytic plasma reactor is placed in a heating furnace, and the temperature in the furnace is controlled to be 450-500 ℃; the reaction gas enters the gas flow channel 6 from the reaction gas inlet joint 2, flows through the photocatalytic area, and is discharged from the reaction gas outlet joint 3 under the normal pressure condition; the power 9 supplies power between the electrode 5 and the conductive structure 8, when a high enough alternating voltage is applied to the discharge electrode 5, the gas between the electrodes 5 is broken down to form dielectric barrier discharge, and barrier discharge plasma is formed, and meanwhile, light can penetrate through the conductive structure 8 and irradiate on the catalyst to generate a photocatalytic reaction. The reactor realizes the synergistic reaction of light, heat and plasma, and expands the chemical research field; utilize the temperature in the thermocouple 10 can accurate measurement chemical reaction district in this application to be convenient for accurate control temperature, improve the parameter accuracy of light, heat, plasma three concerted reaction.

The photocatalytic plasma reactor in this application is vertical when using and is placed, and reaction gas air-inlet joint 2 is located the upper end of outer tube 1, and reaction gas gives vent to anger and connects 3 and be located the lower extreme of outer tube 1, and reaction gas admits air from the top of outer tube 1, and the bottom is given vent to anger, can reduce reaction gas's flow velocity like this, makes its abundant reaction.

The outer sleeve 1 and the inner sleeve 4 are both quartz tubes, so that the device is high in purity, free of graphite, good in insulation and good in corrosion resistance; the inner sleeve 4 is coated outside the electrode 5, the power supply 9 provides high-voltage alternating current between the electrode 5 and the conductive structure 8, when high voltage is generated between the electrode 5 and the conductive structure 8, because gas in the airflow channel 6 at the photocatalytic reaction position is positioned between the electrode 5 and the conductive structure 8, the gas is ionized to form barrier discharge plasma, the electrode 5 is not directly contacted with reaction gas in the process, the corrosion effect of the reaction gas on the electrode 5 is reduced, and therefore the electrode 5 can be protected, and the service life of the electrode is prolonged.

In the application, the distance between the inner wall of the outer sleeve 1 positioned at the outer part and the outer peripheral surface of the inner sleeve 4 is very small, and the voltage meets the requirement of forming plasma.

When the photocatalytic plasma reactor is filled with a catalyst, quartz sand is filled at the lower parts of the outer sleeve 1 and the inner sleeve 4, then the catalyst is filled in a photocatalytic reaction area, and finally the quartz sand is covered on the photocatalytic reaction area.

The embodiments of the present invention are preferred embodiments of the present application, and the protection scope of the present application is not limited thereby, wherein like parts are denoted by like reference numerals. Therefore: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (9)

1. A photocatalytic plasma reactor comprises an outer sleeve (1) which can be placed in a heating furnace, and is characterized in that one end of the outer sleeve (1) is fixedly connected with a reaction gas inlet joint (2), and the other end of the outer sleeve is fixedly connected with a reaction gas outlet joint (3); an inner sleeve (4) is inserted into the outer sleeve (1) along the axial direction of the outer sleeve, and two ends of the inner sleeve (4) extend out of the outer sleeve (1); an electrode (5) is inserted into one end of the inner sleeve (4); a gap is formed between the inner wall of the outer sleeve (1) and the outer peripheral surface of the inner sleeve (4), and the gap forms an airflow channel (6) for communicating the reaction gas inlet joint (2) and the reaction gas outlet joint (3); the outer sleeve (1) is provided with a light-transmitting part (1 a), a photocatalyst (7) is arranged in a gap between the outer sleeve (1) and the inner sleeve (4), and the photocatalyst (7) is positioned at the light-transmitting part (1 a); a light-transmitting conductive structure (8) is arranged on the outer peripheral surface of the outer sleeve (1) at the light-transmitting part (1 a); and a power supply (9) is connected between the electrode (5) and the conductive structure (8).

2. A photocatalytic plasma reactor according to claim 1, characterized in that a thermocouple (10) is inserted into the other end of the inner sleeve (4), the sensing end of the thermocouple (10) extends to the electrode (5), and the connection end of the thermocouple (10) extends out of the inner sleeve (4).

3. A photocatalytic plasma reactor according to claim 2, characterized in that the thermocouple (10) is arranged coaxially with the electrode (5); the middle part of the inner sleeve (4) is provided with a plugging part (4 a), and the end part of the plugging part (4 a) inserting the electrode (5) into the inner sleeve (4) is insulated and isolated from the induction end of the thermocouple (10).

4. A photocatalytic plasma reactor according to claim 1 or 2 or 3, characterized by, that the conductive structure (8) is a metal mesh or a transparent conductive coating.

5. A photocatalytic plasma reactor according to claim 4, characterized by, that the conducting structure (8) is a copper mesh.

6. A photocatalytic plasma reactor according to claim 1, 2 or 3, characterized in that the outer sleeve (1) and the inner sleeve (4) are coaxially arranged; the outer sleeve (1) and the inner sleeve (4) are both made of quartz tubes.

7. A photocatalytic plasma reactor according to claim 1, 2 or 3, characterized in that the reaction gas inlet joint (2) is made of tetrafluoro joint, the reaction gas inlet joint (2) is connected with one end of the outer sleeve (1) in a sealing way through tetrafluoro O-ring, one side of the reaction gas inlet joint (2) is provided with a gas inlet (2 a), and one end of the inner sleeve (4) passes through the reaction gas inlet joint (2) and extends into the outer sleeve (1).

8. A photocatalytic plasma reactor according to claim 7, characterized in that the reaction gas outlet joint (3) is also a tetrafluoro joint, one side of the reaction gas outlet joint (3) has a gas outlet (3 a), the reaction gas outlet joint (3) is connected with the end of the other end of the outer sleeve (1) in a sealing manner through a tetrafluoro O-ring, the gas outlet (3 a) on the reaction gas outlet joint (3) and the gas inlet (2 a) on the reaction gas inlet joint (2) are located on the same side of the outer sleeve (1), and the other end of the inner sleeve (4) passes through the reaction gas outlet joint (3).

9. A photocatalytic plasma reactor according to claim 1, 2 or 3, wherein said light-transmitting portion (1 a) is located at the middle of said outer sleeve (1) or near said reaction gas inlet joint (2), and the length of said light-transmitting portion (1 a) is 1/5 to 1/2 of the length of the entire outer sleeve (1); the end face of the electrode (5) inserted into the inner sleeve (4) is positioned in the area between the two ends of the light-transmitting part (1 a).

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