Cooling type dielectric barrier coaxial reactor

Abstract

The invention discloses a cooling type dielectric barrier coaxial reactor, and relates to the technical field of coaxial reactors. The device comprises a stainless steel electrode, quartz glass and two connecting assemblies, the stainless steel electrode is provided with a floating centering plate and a first polytetrafluoroethylene pressing plate, the quartz glass is fixed between the floating centering plate and the first polytetrafluoroethylene pressing plate, the quartz glass is connected and communicated with a water inlet and a water outlet, and the water inlet and the water outlet are sleeved with annular columns; the connecting assembly comprises a connecting pipe. Quartz glass is used as a dielectric layer, a water inlet and a water outlet are integrated in the quartz glass to form a cooling channel penetrating through a reaction area, cooling water flows in from the water inlet and flows through a gap between the quartz glass and a stainless steel electrode, joule heat generated by discharge is absorbed and then is discharged through the water outlet, so that the temperature of the reaction area is controlled to be 60-80 DEG C, and the reaction time is shortened. Products such as methanol and the like are retained in a reaction area in a liquid form, and the yield of liquid products is increased by about 30-40%.

Description

Technical Field

[0001] The invention belongs to the field of coaxial reactors, and in particular relates to a cooling type dielectric barrier coaxial reactor. Background Art

[0002] Low-temperature plasma technology can decompose greenhouse gases such as CO2 and CH4 in a high-intensity, low-energy manner, converting them into higher-value products. Typical DBD reactors used to treat CO2 and CH4 gas mixtures are coaxial reactors, primarily consisting of inner and outer electrodes, using a single or dual dielectric to suppress corona discharge. The inner electrode is typically a stainless steel rod or other conductive material, coaxially positioned within an inner quartz dielectric or an outer single-layer dielectric. The outer electrode is typically a conductive mesh or foil coated on the outer quartz dielectric. Catalysts are often supported by fillers such as quartz wool and are used to treat greenhouse gases or perform other gas-solid phase reactions.

[0003] Currently, when DBD reactors are used to treat greenhouse gases such as CO2 and CH4, the products are mainly synthesis gas with low added value. For higher-value alcohol liquid products, their low selectivity is closely related to the reactor temperature. Although low-temperature plasma technology can achieve the conversion of CO2 and CH4 at lower temperatures than traditional thermal catalytic processes, the accompanying Joule heating effect will still cause the temperature in the reaction zone to climb to 100°C or above. This temperature range is extremely unfavorable for the stable output of alcohol liquid products, mainly methanol, and can easily cause the target product to escape due to evaporation, making it difficult to form effective liquid product collection.

[0004] Therefore, a cooling type dielectric barrier coaxial reactor is proposed to solve the above-mentioned drawbacks. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a cooling type dielectric barrier coaxial reactor, thereby solving the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

[0007] A cooling type dielectric barrier coaxial reactor comprises a stainless steel electrode, quartz glass and two connecting components;

[0008] A floating centering plate and a first PTFE pressure plate are provided on the stainless steel electrode. The quartz glass is fixed between the floating centering plate and the first PTFE pressure plate. The quartz glass is connected and communicated with a water inlet and a water outlet. Both the water inlet and the water outlet are sleeved with an annular column.

[0009] The connecting assembly includes a connecting pipe, which is rotatably engaged with multiple clamping plates. The inner wall of the annular column is threadedly engaged with the clamping plate. A first sealing plate is provided at one end of the connecting pipe, and a second sealing plate is rotatably engaged with one end of the first sealing plate. The two second sealing plates are respectively engaged with the interfaces of the water inlet and the water outlet.

[0010] Optionally, a first insulating sealing sleeve is provided on the floating centering plate, a first insulating transition tube is provided on the first insulating sealing sleeve, an air outlet is provided at the end of the first insulating transition tube away from the first insulating sealing sleeve, a second insulating sealing sleeve is provided on the first PTFE pressure plate, a second insulating transition tube is provided on the second insulating sealing sleeve, and an air inlet is provided at the end of the second insulating transition tube away from the second insulating sealing sleeve.

[0011] Optionally, a high-voltage terminal and a second tetrafluoroethylene pressure plate are provided on the second insulating sealing sleeve, and the second tetrafluoroethylene pressure plate is sleeved on the high-voltage terminal.

[0012] Optionally, positioning pieces are provided on both the water inlet and the water outlet, positioning grooves are provided on the positioning pieces, a card passes through the positioning grooves, a chamfer is provided on the end of the card away from the positioning piece, an external thread is provided on the outer wall of the card, an internal thread is provided on the inner wall of the annular column, and the external thread cooperates with the internal thread.

[0013] Optionally, a first annular groove is provided on the outer wall of the connecting tube, a first annular plate is rotatably fitted inside the first annular groove, a plurality of first rubber strips are provided on the outer wall of the first annular plate, and one end of the clamping plate is fixed to the first annular plate.

[0014] Optionally, a second annular groove is provided at one end of the water inlet and the water outlet, the first sealing plate and the second sealing plate are both located in the second annular groove, a first rubber pad is provided on the second sealing plate, the first rubber pad is located in the second annular groove, a second rubber pad is provided at one end of the water inlet and the water outlet, and the second rubber pad cooperates with one end of the connecting pipe.

[0015] Optionally, a third annular groove is provided on the first sealing plate, and the cross-section of the third annular groove is T-shaped. A second annular plate is provided on the second sealing plate, and the cross-section of the second annular plate is T-shaped. The second annular plate is rotatably fitted in the third annular groove, and a plurality of second rubber strips are evenly distributed on the outer wall of the second sealing plate.

[0016] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art. Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described below at the same time:

[0017] Quartz glass serves as the dielectric layer, with integrated water inlets and outlets, forming a cooling channel that runs through the reaction area. Cooling water flows in from the water inlet, passes through the gap between the quartz glass and the stainless steel electrode, absorbs the Joule heat generated by the discharge, and is then discharged through the water outlet, keeping the temperature of the reaction area at 60-80°C. This allows products such as methanol to remain in the reaction area in liquid form, increasing the yield of liquid products by approximately 30%-40%.

[0018] The annular column is connected to the external thread of the card plate through the internal thread, fixing the connecting pipe to the outside of the water inlet and outlet, improving the stability of the cooling water flow path. The cooperation between the positioning piece and the positioning groove limits the displacement of the card plate, reducing the decline in cooling efficiency due to installation deviation.

[0019] The first sealing plate and the second sealing plate at one end of the connecting pipe are embedded in the second annular grooves of the water inlet and outlet. The first rubber pad on the second sealing plate is tightly pressed against the wall of the second annular groove to form a first seal. The second rubber pads at the ends of the water inlet and outlet fit against the end faces of the connecting pipe to form a second seal. The double sealing structure controls the leakage rate to below 0.5%.

[0020] The third annular groove of the first sealing plate rotates with the T-shaped second annular plate of the second sealing plate, allowing for fine-angle adjustment during installation. At the same time, the second rubber strip on the outer side of the second sealing plate cooperates with the inner wall of the second annular groove to further enhance sealing performance.

[0021] The first annular plate rotates in the first annular groove on the outside of the connecting tube to cooperate with the first annular plate, and the clamping plate is fixed on the first annular plate. When the first annular plate is rotated, the clamping plate is tightened with the annular column through the internal thread and the external thread. At this time, the annular column squeezes the outer wall of the positioning part, increasing the friction and reducing the loosening of the clamping plate, thereby improving the stability of the sealing structure during the connection.

[0022] The dielectric barrier discharge structure composed of stainless steel electrodes and quartz glass forms a stable plasma region in the electrode gap after high voltage is connected to the high-voltage terminal. The cooling system does not affect the discharge process. The first insulating sealing sleeve and the second insulating sealing sleeve isolate the electrodes from the cooling water to prevent leakage. The air inlet and outlet allow the continuous inflow of reaction gases (such as CO2 and CH4) and the smooth discharge of product gases to maintain the continuity of the plasma reaction.

[0023] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings described below are only some embodiments. A person skilled in the art can derive other drawings based on these drawings without inventive effort. In the drawings:

[0025] Figure 1It is a schematic diagram of the three-dimensional structure;

[0026] Figure 2 It is a schematic diagram of the structure when viewed from above;

[0027] Figure 3 It is a right view structural diagram;

[0028] Figure 4 Schematic diagram of the connecting pipe structure;

[0029] Figure 5 Schematic diagram of the cross-section structure Figure 1 ;

[0030] Figure 6 Schematic diagram of the cross-section structure Figure 2 .

[0031] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0032] Quartz glass 1, water inlet 2, water outlet 3, floating centering plate 4, first PTFE pressure plate 5, first insulating sealing sleeve 6, second insulating sealing sleeve 7, second PTFE pressure plate 8, high-voltage terminal 9, first insulating transition tube 10, second insulating transition tube 11, air outlet 12, air inlet 13, connecting tube 14, first annular groove 15, first annular plate 16, first rubber strip 17, clamping plate 18, chamfer 19, external thread 20, positioning member 21, positioning groove 22, annular column 23, second annular groove 24, first sealing plate 25, second sealing plate 26, first rubber pad 27, second rubber pad 28, third annular groove 29, second annular plate 30, second rubber strip 31.

[0033] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0034] The present invention will now be described in further detail with reference to the accompanying drawings.

[0035] See also Figure 1-6 As shown, in this embodiment, a cooling type dielectric barrier coaxial reactor is provided, comprising a stainless steel electrode, a quartz glass 1 and two connecting components;

[0036] A floating centering plate 4 and a first PTFE pressure plate 5 are provided on the stainless steel electrode. A quartz glass 1 is fixed between the floating centering plate 4 and the first PTFE pressure plate 5. A water inlet 2 and a water outlet 3 are connected and communicated with the quartz glass 1. An annular column 23 is provided on the water inlet 2 and the water outlet 3.

[0037] The connecting assembly includes a connecting pipe 14, which is rotatably engaged with a plurality of clamping plates 18. The inner wall of the annular column 23 is threadedly engaged with the clamping plate 18. A first sealing plate 25 is provided at one end of the connecting pipe 14, and a second sealing plate 26 is rotatably engaged with one end of the first sealing plate 25. The two second sealing plates 26 are respectively engaged with the interfaces of the water inlet 2 and the water outlet 3.

[0038] Quartz glass 1 serves as the dielectric layer, with an integrated water inlet 2 and water outlet 3 inside, forming a cooling channel that runs through the reaction area. Cooling water flows in from the water inlet 2 and, as it flows through the gap between the quartz glass 1 and the stainless steel electrode, absorbs the Joule heat generated by the discharge, and is then discharged through the water outlet 3. This keeps the temperature of the reaction area at 60-80°C, allowing products such as methanol to remain in the reaction area in liquid form, and increasing the yield of liquid products by approximately 30%-40%.

[0039] The dielectric barrier discharge structure composed of stainless steel electrodes and quartz glass 1 is connected to high voltage through the high-voltage terminal 9, forming a stable plasma region in the electrode gap. The cooling system does not affect the discharge process. The first insulating sealing sleeve 6 and the second insulating sealing sleeve 7 isolate the electrodes from the cooling water to prevent leakage. The air inlet 13 and the air outlet 12 allow the continuous inflow of reaction gases such as CO2 and CH4 and the smooth discharge of product gases, maintaining the continuity of the plasma reaction.

[0040] In this embodiment, a first insulating sealing sleeve 6 is provided on the floating centering plate 4, a first insulating transition tube 10 is provided on the first insulating sealing sleeve 6, an air outlet 12 is provided at the end of the first insulating transition tube 10 away from the first insulating sealing sleeve 6, a second insulating sealing sleeve 7 is provided on the first tetrafluoroethylene pressure plate 5, a second insulating transition tube 11 is provided on the second insulating sealing sleeve 7, and an air inlet 13 is provided at the end of the second insulating transition tube 11 away from the second insulating sealing sleeve 7.

[0041] The second insulating sealing sleeve 7 of this embodiment is provided with a high-voltage terminal 9 and a second PTFE pressing plate 8 , and the second PTFE pressing plate 8 is sleeved on the high-voltage terminal 9 .

[0042] In this embodiment, a positioning piece 21 is provided on the water inlet 2 and the water outlet 3, and a positioning groove 22 is opened on the positioning piece 21. The clamping plate 18 passes through the positioning groove 22. The end of the clamping plate 18 away from the positioning piece 21 is provided with a chamfer 19. The outer wall of the clamping plate 18 is provided with an external thread 20, and the inner wall of the annular column 23 is provided with an internal thread, and the external thread 20 is matched with the internal thread.

[0043] The annular column 23 is threadedly connected to the external thread 20 of the clamping plate 18 through the internal thread, fixing the connecting pipe 14 to the outside of the water inlet 2 and the water outlet 3, thereby improving the stability of the cooling water flow path. The cooperation between the positioning member 21 and the positioning groove 22 limits the displacement of the clamping plate 18, reducing the decrease in cooling efficiency due to installation deviation.

[0044] The outer wall of the connecting pipe 14 of this embodiment is provided with a first annular groove 15 , and a first annular plate 16 is rotatably fitted inside the first annular groove 15 . The outer wall of the first annular plate 16 is provided with a plurality of first rubber strips 17 , and one end of the clamping plate 18 is fixed to the first annular plate 16 .

[0045] The first annular groove 15 on the outside of the connecting tube 14 rotates to cooperate with the first annular plate 16, and the clamping plate 18 is fixed on the first annular plate 16. When the first annular plate 16 is rotated, the clamping plate 18 is tightened with the annular column 23 through the internal thread and the external thread. At this time, the annular column 23 squeezes the outer wall of the positioning member 21, increasing the friction force to reduce the loosening of the clamping plate 18, thereby improving the stability of the sealing structure during the connection.

[0046] In this embodiment, a second annular groove 24 is provided at one end of the water inlet 2 and the water outlet 3, and the first sealing plate 25 and the second sealing plate 26 are both located in the second annular groove 24. A first rubber pad 27 is provided on the second sealing plate 26, and the first rubber pad 27 is located in the second annular groove 24. A second rubber pad 28 is provided at one end of the water inlet 2 and the water outlet 3, and the second rubber pad 28 cooperates with one end of the connecting pipe 14.

[0047] The first sealing plate 25 and the second sealing plate 26 at one end of the connecting pipe 14 are embedded in the second annular groove 24 of the water inlet 2 and the water outlet 3. The first rubber pad 27 on the second sealing plate 26 is tightly squeezed against the wall of the second annular groove 24 to form a first seal. The second rubber pad 28 at the end of the water inlet 2 and the water outlet 3 fits against the end face of the connecting pipe 14 to form a second seal. The double sealing structure controls the leakage rate to below 0.5%.

[0048] In this embodiment, a third annular groove 29 is provided on the first sealing plate 25, and the cross-section of the third annular groove 29 is T-shaped. A second annular plate 30 is provided on the second sealing plate 26, and the cross-section of the second annular plate 30 is T-shaped. The second annular plate 30 is rotatably fitted in the third annular groove 29. A plurality of second rubber strips 31 are evenly distributed on the outer wall of the second sealing plate 26.

[0049] The third annular groove 29 of the first sealing plate 25 rotates with the T-shaped second annular plate 30 of the second sealing plate 26, allowing fine adjustment of the angle during installation. At the same time, the second rubber strip 31 on the outer side of the second sealing plate 26 cooperates with the inner wall of the second annular groove 24 to further enhance the sealing performance.

[0050] The first sealing plate 25 and the second sealing plate 26 cooperate with the second annular groove 24 and form a double seal in combination with the first rubber pad 27 and the second rubber pad 28, and the leakage rate is controlled below 0.5%.

[0051] Working principle:

[0052] The first sealing plate 25 and the second sealing plate 26 at one end of the connecting pipe 14 are embedded in the second annular groove 24 of the water inlet 2 and the water outlet 3. The first rubber pad 27 on the second sealing plate 26 fits tightly with the wall of the second annular groove 24. At the same time, the second rubber pad 28 at the end of the water inlet 2 and the water outlet 3 is squeezed with the end face of the connecting pipe 14 to form a double seal to reduce cooling water leakage. The positioning member 21 and the positioning groove 22 limit the movement trajectory of the card plate 18. The chamfer 19 at the end of the card plate 18 is convenient for inserting into the positioning groove 22. The outer side of the water inlet 2 and the water outlet 3 is sleeved with an annular column 23. The inner wall of the annular column 23 is threadedly matched with the external thread 20 of the card plate 18 through the internal thread to realize the connection between the connecting pipe 14 and the water inlet 2 and the water outlet 3. The quartz glass 1 is fixed, and cooling water is introduced into the interior of the quartz glass 1 through the water inlet 2. The cooling water circulates in the reactor. During the reaction, the Joule heating effect will cause the local temperature to rise to above 100°C, and the cooling water continues to take away heat through the circulation, controlling the temperature of the reaction area within a low range, absorbing the Joule heat generated during the reaction, and then discharged through the water outlet 3, thereby reducing the temperature of the reaction area. At the same time, the stainless steel electrodes and the quartz glass 1 form a dielectric barrier discharge structure. After the high-voltage terminal 9 is connected to the high voltage, a plasma area is formed between the stainless steel electrodes, and the cooling system continues to work, so that the reaction temperature is maintained within an appropriate range, reducing the evaporation of alcohol products due to high temperature, and improving the collection efficiency of the target product.

[0053] Under conditions of 60-80°C, methanol and other alcohol products remain in the reaction area in liquid form, rather than evaporating due to high temperature as in traditional processes. For example, when the reaction temperature exceeds 100°C, the vapor pressure of methanol increases significantly and the liquid collection efficiency drops sharply. However, this reactor can increase the yield of liquid products by 30%-40% through temperature control. Verification through air DBD measurement and oxygen mixed gas shows that the outlet gas temperature fluctuates only -0.2 to 0.6K, confirming that the cooling system can effectively maintain a low-temperature environment, thereby enabling the stable generation and collection of liquid products. It is suitable for industrial scenarios such as waste gas treatment and denitrification that require high-concentration ozone, reflecting its versatility and practicality.

[0054] When the reaction temperature exceeds 100°C, the effect of temperature on ozone generation is as follows:

[0055] Mechanism analysis: The water electrode lowers the temperature of the dielectric layer and the gas through direct heat exchange, weakening the ozone decomposition reaction caused by high temperature while maintaining the efficiency of the generation reaction.

[0056] Performance advantages: The low temperature characteristic improves the ozone generation efficiency. For example, the ozone concentration of the reactor in this article can reach 12293.59ppm, and the generation efficiency is 391.66g / kWh, which is better than some commercial ozone generators.

[0057] The discharge power of the water electrode DBD is positively correlated with the peak voltage, the micro-discharge temperature (Trot≈310K) is significantly lower than that of the traditional DBD, and the outlet gas temperature is almost unaffected by the discharge.

[0058] Low micro-discharge temperature promotes ozone generation and inhibits decomposition, and maintains excellent performance under oxygen-rich conditions. It is suitable for industrial ozone applications with high concentration and high energy utilization (such as waste gas treatment and denitrification).

[0059] The present invention is not limited to the above-described embodiments. Any structural changes made under the guidance of the present invention, which have the same or similar technical solutions as the present invention, should be understood to fall within the scope of protection of the present invention. The technologies, shapes, and structural parts not described in detail in the present invention are all well-known technologies.

Claims

1. A cooling type dielectric barrier coaxial reactor, characterized in that: include: Stainless steel electrodes, quartz glass (1) and two connecting components; A floating centering plate (4) and a first tetrafluoroethylene pressure plate (5) are provided on the stainless steel electrode, a quartz glass (1) is fixed between the floating centering plate (4) and the first tetrafluoroethylene pressure plate (5), a water inlet (2) and a water outlet (3) are connected and communicated with the quartz glass (1), and an annular column (23) is sleeved on the water inlet (2) and the water outlet (3); The connection assembly comprises a connection pipe (14), a plurality of clamping plates (18) are rotatably engaged with the connection pipe (14), the inner side wall of the annular column (23) is threadedly engaged with the clamping plates (18), a first sealing plate (25) is provided at one end of the connection pipe (14), a second sealing plate (26) is rotatably engaged with one end of the first sealing plate (25), and the two second sealing plates (26) are respectively engaged with the interfaces of the water inlet (2) and the water outlet (3).

2. A cooling type dielectric barrier coaxial reactor according to claim 1, characterized in that: A first insulating sealing sleeve (6) is provided on the floating centering plate (4), a first insulating transition tube (10) is provided on the first insulating sealing sleeve (6), and an air outlet (12) is provided at the end of the first insulating transition tube (10) away from the first insulating sealing sleeve (6).

3. The cooling type dielectric barrier coaxial reactor according to claim 1, characterized in that: A second insulating sealing sleeve (7) is provided on the first tetrafluoroethylene pressure plate (5), a second insulating transition tube (11) is provided on the second insulating sealing sleeve (7), and an air inlet (13) is provided at the end of the second insulating transition tube (11) away from the second insulating sealing sleeve (7).

4. A cooling type dielectric barrier coaxial reactor according to claim 3, characterized in that: The second insulating sealing sleeve (7) is provided with a high-voltage terminal (9) and a second tetrafluoroethylene pressure plate (8), and the second tetrafluoroethylene pressure plate (8) is sleeved on the high-voltage terminal (9).

5. The cooling type dielectric barrier coaxial reactor according to claim 1, characterized in that: A positioning piece (21) is provided on both the water inlet (2) and the water outlet (3), a positioning groove (22) is provided on the positioning piece (21), a clamping plate (18) passes through the positioning groove (22), and a chamfer (19) is provided on the end of the clamping plate (18) away from the positioning piece (21).

6. The cooling type dielectric barrier coaxial reactor according to claim 1, characterized in that: The outer wall of the clamping plate (18) is provided with an external thread (20), and the inner wall of the annular column (23) is provided with an internal thread, and the external thread (20) is threadably matched with the internal thread.

7. The cooling type dielectric barrier coaxial reactor according to claim 1, characterized in that: A first annular groove (15) is provided on the outer wall of the connecting pipe (14), a first annular plate (16) is rotatably fitted inside the first annular groove (15), a plurality of first rubber strips (17) are provided on the outer wall of the first annular plate (16), and one end of the clamping plate (18) is fixed on the first annular plate (16).

8. The cooling type dielectric barrier coaxial reactor according to claim 1, characterized in that: A second annular groove (24) is provided at one end of the water inlet (2) and the water outlet (3); the first sealing plate (25) and the second sealing plate (26) are both located in the second annular groove (24); a first rubber pad (27) is provided on the second sealing plate (26); and the first rubber pad (27) is located in the second annular groove (24).

9. The cooling type dielectric barrier coaxial reactor according to claim 1, characterized in that: One end of each of the water inlet (2) and the water outlet (3) is provided with a second rubber pad (28), and the second rubber pad (28) is matched with one end of the connecting pipe (14).

10. The cooling type dielectric barrier coaxial reactor according to claim 1, characterized in that: A third annular groove (29) is provided on the first sealing plate (25), and the cross section of the third annular groove (29) is T-shaped. A second annular plate (30) is provided on the second sealing plate (26), and the cross section of the second annular plate (30) is T-shaped. The second annular plate (30) is rotatably fitted in the third annular groove (29). A plurality of second rubber strips (31) are evenly distributed on the outer wall of the second sealing plate (26).

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