A nitrogen oxide conversion device for fixed pollution source monitoring

Abstract

The present invention relates to the technical field related to pollution source monitoring, and specifically to a nitrogen oxide conversion device for fixed pollution source monitoring. The nitrogen oxide conversion device for fixed pollution source monitoring includes a heating structure, a nitrogen oxide conversion tube, and a catalytic structure. The heating structure is a circular tube structure, and the heating structure is composed of an inner heat conduction layer, an outer heat insulation layer, and a resistance heating wire. The two ends of the resistance heating wire are respectively electrically connected to a power source through a first wire and a second wire, and the two ends of the heating structure are respectively sealed by a first heat insulation plug and a second heat insulation plug. First sealing seats and second sealing seats are respectively arranged at the two ends of the nitrogen oxide conversion tube; by providing a nitrogen oxide conversion device composed of a heating structure, a nitrogen oxide conversion tube, and a catalytic structure, nitrogen dioxide in the gas is converted into nitric oxide through a reaction, so that the fixed pollution source monitoring device can more accurately and quickly monitor the nitrogen element content in the polluted gas.

Description

Technical Field

[0001] The present invention relates to the technical field related to pollution source monitoring, and particularly to a nitrogen oxide conversion device for fixed pollution source monitoring. Background Technique

[0002] Nitrogen oxides refer to compounds composed of only nitrogen and oxygen elements, including various compounds such as N2O, NO, NO2, N2O3, N2O4, and N2O5. Except for NO and NO2, other nitrogen oxides are unstable and turn into NO and NO2 when exposed to light, moisture, or heat. Nitric oxide is easily converted into nitrogen dioxide. Therefore, the nitrogen oxide gas mixture contacted in the environment is mainly nitric oxide and nitrogen dioxide, with nitrogen dioxide being the main component. Nitrogen oxides all have varying degrees of toxicity. Nitrogen oxides are one of the main causes of environmental problems such as acid rain, ozone holes, and photochemical smog. Nitrogen oxides can also stimulate the lungs, making it more difficult for people to resist respiratory diseases such as colds. For children, nitrogen oxides may cause damage to lung development. The toxic smoke formed by the reaction of nitrogen oxides in automobile exhaust and hydrocarbons under ultraviolet irradiation is called photochemical smog. Photochemical smog has a special smell, irritates the eyes, harms plants, and can reduce the atmospheric visibility. Therefore, controlling the emission of nitrogen oxides is one of the means to solve environmental pollution. Under the current technical conditions, on-line analyzers cannot measure NO2 well. For this reason, the present invention proposes a nitrogen oxide conversion device for fixed pollution source monitoring to solve the above problems. Summary of the Invention

[0003] The purpose of the present invention is to provide a nitrogen oxide conversion device for fixed pollution source monitoring to solve the problems raised in the above background technique.

[0004] To achieve the above purpose, the present invention provides the following technical solution: A nitrogen oxide conversion device for fixed pollution source monitoring, the nitrogen oxide conversion device for fixed pollution source monitoring includes:

[0005] A heating structure, the heating structure is a circular tube structure, and the heating structure is composed of an inner heat conduction layer, an outer heat insulation layer, and a resistance heating wire. The two ends of the resistance heating wire are respectively electrically connected to a power supply through a first wire and a second wire, and the two ends of the heating structure are respectively sealed by a first heat insulation plug and a second heat insulation plug;

[0006] A nitrogen oxide conversion tube, first sealing seats and second sealing seats are respectively arranged at both ends of the nitrogen oxide conversion tube. An intake pipe is connected to the first sealing seat, and an exhaust pipe is connected to the second sealing seat. The intake pipe and the exhaust pipe are both communicated with the inner cavity of the nitrogen oxide conversion tube;

[0007] The catalytic structure is composed of a first catalytic structure, a second catalytic structure and a connecting rod, and a plurality of catalytic structures are equidistantly arranged in the nitrogen oxide conversion tube.

[0008] Preferably, the inner heat-conducting layer is a ceramic plate, and the outer heat-insulating layer is a heat-insulating plate.

[0009] Preferably, the resistance heating wire is arranged in a spiral shape, and a temperature sensor probe is arranged in the inner cavity of the inner heat-conducting layer. The temperature sensor probe is electrically connected to the PLC control module on the device through a wire body, and the control switches connected to the first wire and the second wire are electrically connected to the PLC control module.

[0010] Preferably, through holes are formed in both the first heat-insulating plug and the second heat-insulating plug, and the air inlet pipe and the exhaust pipe are both arranged through the through holes.

[0011] Preferably, an internal thread structure is arranged on the inner side wall of the nitrogen oxide conversion tube. The first catalytic structure and the second catalytic structure are fixed by a connecting rod, and an external thread structure is arranged on the outer side wall of the first catalytic structure. The first catalytic structure is threadedly connected to the inner side wall of the nitrogen oxide conversion tube.

[0012] Preferably, the first catalytic structure is in a horn-shaped structure, and a wrench groove is formed at the port position of the first catalytic structure. The wrench groove has a regular hexagonal notch. The second catalytic structure is in a conical structure, and a gap is left between the second catalytic structure and the inner side wall of the nitrogen oxide conversion tube.

[0013] A support rod is arranged at the port position of the second catalytic structure. When the catalytic structure is actually installed, between adjacent catalytic structures, the support rod abuts against the port of the first catalytic structure of the adjacent catalytic structure.

[0014] Catalyst coatings are arranged on both the inner side wall of the first catalytic structure and the outer side wall of the second catalytic structure.

[0015] A first annular protrusion is integrally formed on the inner side wall of the first catalytic structure, and a second annular protrusion is integrally formed on the outer side wall of the second catalytic structure. The catalyst coating is arranged on the outer sides of the first annular protrusion and the second annular protrusion.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. By providing a nitrogen oxide conversion device composed of a heating structure, a nitrogen oxide conversion tube and a catalytic structure, nitrogen dioxide in the gas is converted into nitric oxide through a reaction, so that the fixed pollution source monitoring device can more accurately and quickly monitor the nitrogen element content in the polluted gas;

[0018] 2. The catalytic structure is configured to be composed of a first catalytic structure, a second catalytic structure and a connecting rod. The first catalytic structure is configured to be in a horn-shaped structure, and the second catalytic structure is configured to be in a conical structure. A catalyst coating is applied on the inner side wall of the first catalytic structure and the outer side wall of the second catalytic structure. The coating-type catalytic coating can effectively prevent the inner cavity of the pipeline from being blocked. The horn-shaped structure of the first catalytic structure can make the gas flow in a converging manner, and the conical second catalytic structure can make the gas flow in a diffusing manner, so that the gas continuously undergoes the processes of convergence and diffusion, enabling the gas to better contact the catalyst coating, thereby improving the conversion rate of nitrogen dioxide. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of the present invention;

[0020] Figure 2 is a half-sectional view of the present invention;

[0021] Figure 3 is Figure 2 an enlarged schematic view of the structure at A in

[0022] Figure 4 is a half-sectional view of the nitrogen oxide conversion tube of the present invention;

[0023] Figure 5 is Figure 4 an enlarged schematic view of the structure at B in

[0024] Figure 6 is a schematic diagram of the catalytic structure of the present invention;

[0025] Figure 7 is a half-sectional view of the catalytic structure;

[0026] Figure 8 is Figure 7 an enlarged schematic view of the structure at C in

[0027] In the figure: heating structure 1, nitrogen oxide conversion tube 2, catalytic structure 3, first heat preservation plug 4, second heat preservation plug 5, temperature sensor probe 6, wire body 7, heat conduction layer 8, outer heat preservation layer 9, resistance heating wire 10, first wire 11, second wire 12, first sealing seat 13, second sealing seat 14, intake pipeline 15, exhaust pipeline 16, first catalytic structure 17, second catalytic structure 18, connecting rod 19, support rod 20, wrench groove 21, first annular protrusion 22, second annular protrusion 23. DETAILED DESCRIPTION OF THE INVENTION

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0029] Please refer to Figures 1-8 , the present invention provides a technical solution: a nitrogen oxide conversion device for fixed pollution source monitoring. The nitrogen oxide conversion device for fixed pollution source monitoring includes:

[0030] A heating structure 1, the heating structure 1 is a circular tube structure, and the heating structure 1 is composed of an inner heat-conducting layer 8, an outer heat-insulating layer 9 and a resistance heating wire 10. The two ends of the resistance heating wire 10 are respectively electrically connected to a power source through a first wire 11 and a second wire 12, and the two ends of the heating structure 1 are respectively sealed by a first heat-insulating plug 4 and a second heat-insulating plug 5;

[0031] A nitrogen oxide conversion tube 2, with a first sealing seat 13 and a second sealing seat 14 respectively arranged at both ends of the nitrogen oxide conversion tube 2. An intake pipeline 15 is connected to the first sealing seat 13, and an exhaust pipeline 16 is connected to the second sealing seat 14. The intake pipeline 15 and the exhaust pipeline 16 are both communicated with the inner cavity of the nitrogen oxide conversion tube 2;

[0032] A catalytic structure 3, the catalytic structure 3 is composed of a first catalytic structure 17, a second catalytic structure 18 and a connecting rod 19 in combination, and a plurality of catalytic structures 3 are arranged at equal intervals in the nitrogen oxide conversion tube 2. By setting a nitrogen oxide conversion device composed of a heating structure 1, a nitrogen oxide conversion tube 2 and a catalytic structure 3, nitrogen dioxide in the gas is converted into nitric oxide through a reaction, so that the fixed pollution source monitoring device can more accurately and quickly monitor the nitrogen element content in the polluted gas.

[0033] The inner heat-conducting layer 8 is a ceramic plate, and the outer heat-insulating layer 9 is a heat-insulating plate to reduce heat damage;

[0034] The resistance heating wire 10 is arranged in a spiral shape, and a temperature sensor probe 6 is arranged in the inner cavity of the inner heat-conducting layer 8. The temperature sensor probe 6 is electrically connected to the PLC control module on the device through a wire body 7, and the control switches connected to the first wire 11 and the second wire 12 are electrically connected to the PLC control module;

[0035] Through holes are provided on both the first heat-insulating plug 4 and the second heat-insulating plug 5, and the intake pipeline 15 and the exhaust pipeline 16 both pass through the through holes for setting;

[0036] The inner wall of the nitrogen oxide conversion tube 2 is provided with an internal thread structure. The first catalytic structure 17 and the second catalytic structure 18 are fixed by a connecting rod 19. The outer wall of the first catalytic structure 17 is provided with an external thread structure, and the first catalytic structure 17 is threadedly connected to the inner wall of the nitrogen oxide conversion tube 2;

[0037] The first catalytic structure 17 is in a horn-shaped structure, and a wrench groove 21 is opened at the port position of the first catalytic structure 17. The wrench groove 21 has a regular hexagonal notch. The second catalytic structure 18 is in a conical structure, and a gap is left between the second catalytic structure 18 and the inner wall of the nitrogen oxide conversion tube 2. A support rod 20 is arranged at the port position of the second catalytic structure 18. During the actual installation of the catalytic structure 3, between adjacent catalytic structures 3, the support rod 20 abuts against the port of the first catalytic structure 17 of the adjacent catalytic structure 3. Catalyst coatings are provided on the inner wall of the first catalytic structure 17 and the outer wall of the second catalytic structure 18. By setting the catalytic structure 3 to be composed of the first catalytic structure 17, the second catalytic structure 18 and the connecting rod 19, setting the first catalytic structure 17 to be in a horn-shaped structure, setting the second catalytic structure 18 to be in a conical structure, and coating catalyst coatings on the inner wall of the first catalytic structure 17 and the outer wall of the second catalytic structure 18, the coated catalyst can effectively avoid the phenomenon of blockage in the inner cavity of the pipeline. Moreover, the horn-shaped structure of the first catalytic structure 17 can make the gas flow in a converging manner, and the conical second catalytic structure 18 can make the gas flow in a diffusing manner, so that the gas continuously undergoes the processes of convergence and diffusion, so that the gas can better contact with the catalyst coating, thereby improving the conversion rate of nitrogen dioxide;

[0038] A first annular protrusion 22 is integrally formed on the inner wall of the first catalytic structure 17, and a second annular protrusion 23 is integrally formed on the outer wall of the second catalytic structure 18, and the catalyst coating is provided on the outer sides of the first annular protrusion 22 and the second annular protrusion 23;

[0039] Working principle: By setting up a nitrogen oxide conversion device composed of a heating structure 1, a nitrogen oxide conversion tube 2, and a catalytic structure 3, nitrogen dioxide in the gas is converted into nitric oxide through a reaction, enabling the fixed pollution source monitoring device to more accurately and quickly monitor the nitrogen element content in the polluted gas. The catalytic structure 3 is set to be composed of a first catalytic structure 17, a second catalytic structure 18, and a connecting rod 19. The first catalytic structure 17 is set to be in a horn-shaped structure, and the second catalytic structure 18 is set to be in a conical structure. A catalyst coating is applied on the inner sidewall of the first catalytic structure 17 and the outer sidewall of the second catalytic structure 18. This coated catalyst can effectively prevent blockage in the inner cavity of the pipeline. Moreover, the horn-shaped structure of the first catalytic structure 17 allows the gas to flow in a converging manner, and the conical structure of the second catalytic structure 18 allows the gas to flow in a diffusing manner. Thus, the gas continuously undergoes the processes of convergence and diffusion, enabling the gas to better contact the catalyst coating, thereby increasing the conversion rate of nitrogen dioxide. In actual use, first, the device power supply is connected, and then the heating structure 1 heats the nitrogen oxide conversion tube 2. When the nitrogen oxide conversion tube 2 reaches a certain temperature, the gas enters the nitrogen oxide conversion tube 2 from the intake pipeline 15. Nitrogen dioxide in the gas decomposes into nitric oxide under the action of high temperature and the catalyst, and the decomposed gas is discharged through the exhaust pipeline 16 to the pollution source monitoring device for detection.

[0040] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A nitrogen oxide conversion device for fixed pollution source monitoring, characterized in that: The nitrogen oxide conversion device for fixed pollution source monitoring includes: A heating structure (1), the heating structure (1) is a circular tube structure, and the heating structure (1) is composed of an inner heat conduction layer (8), an outer heat insulation layer (9) and a resistance heating wire (10). The two ends of the resistance heating wire (10) are respectively electrically connected to a power supply through a first wire (11) and a second wire (12), and the two ends of the heating structure (1) are respectively sealed by a first heat insulation plug (4) and a second heat insulation plug (5); A nitrogen oxide conversion tube (2), with a first seal seat (13) and a second seal seat (14) respectively arranged at both ends of the nitrogen oxide conversion tube (2). An intake pipe (15) is connected to the first seal seat (13), and an exhaust pipe (16) is connected to the second seal seat (14). The intake pipe (15) and the exhaust pipe (16) are both communicated with the inner cavity of the nitrogen oxide conversion tube (2); A catalytic structure (3), the catalytic structure (3) is composed of a first catalytic structure (17), a second catalytic structure (18) and a connecting rod (19) in combination, and a plurality of catalytic structures (3) are arranged at equal intervals in the nitrogen oxide conversion tube (2); Through holes are provided on both the first heat insulation plug (4) and the second heat insulation plug (5), and the intake pipe (15) and the exhaust pipe (16) are both arranged through the through holes; An internal thread structure is provided on the inner side wall of the nitrogen oxide conversion tube (2). The first catalytic structure (17) and the second catalytic structure (18) are fixed by a connecting rod (19). An external thread structure is provided on the outer side wall of the first catalytic structure (17), and the first catalytic structure (17) is threadedly connected to the inner side wall of the nitrogen oxide conversion tube (2); The first catalytic structure (17) is in a horn-shaped structure, and a wrench groove (21) is provided at the port position of the first catalytic structure (17). The wrench groove (21) has a regular hexagonal notch. The second catalytic structure (18) is in a conical structure, and a gap is left between the second catalytic structure (18) and the inner side wall of the nitrogen oxide conversion tube (2); A support rod (20) is provided at the port position of the second catalytic structure (18). When the catalytic structure (3) is actually installed, between adjacent catalytic structures (3), the support rod (20) abuts against the port of the first catalytic structure (17) of the adjacent catalytic structure (3); Catalyst coatings are provided on both the inner side wall of the first catalytic structure (17) and the outer side wall of the second catalytic structure (18); A first annular protrusion (22) is integrally formed on the inner side wall of the first catalytic structure (17), a second annular protrusion (23) is integrally formed on the outer side wall of the second catalytic structure (18), and the catalyst coatings are provided on the outer sides of the first annular protrusion (22) and the second annular protrusion (23); 2. The nitrogen oxide conversion device for fixed pollution source monitoring according to claim 1, wherein: The inner heat conduction layer (8) is a ceramic plate, and the outer heat insulation layer (9) is a heat insulation board.

3. The nitrogen oxide conversion device for fixed pollution source monitoring according to claim 2, characterized in that: The resistance heating wire (10) is arranged in a spiral shape, and a temperature sensor probe (6) is arranged in the inner cavity of the inner heat conduction layer (8). The temperature sensor probe (6) is electrically connected to the PLC control module on the device through a wire body (7), and the control switches connected to the first wire (11) and the second wire (12) are electrically connected to the PLC control module.

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