CN113617224A - Treatment device and treatment method for nitrogen oxide waste gas for high-speed wire enamelling machine - Google Patents
Treatment device and treatment method for nitrogen oxide waste gas for high-speed wire enamelling machine Download PDFInfo
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- B01D53/34—Chemical or biological purification of waste gases
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Abstract
The invention discloses a device and a method for treating nitrogen oxide waste gas for a high-speed enameled wire machine, which comprises a treatment unit, wherein the treatment unit sequentially comprises an air inlet pipe, a primary treatment component and a secondary treatment component according to the waste gas treatment process, the nitrogen oxide waste gas to be treated sequentially passes through a metal mesh catalyst layer, a heating device and a ceramic honeycomb catalyst layer, and finally the discharged gas is nitrogen and water, so that the aim of removing nitrogen oxide is fulfilled, harmless, safe, rapid and high-efficiency treatment is realized, the treatment process is simple, the nitrogen oxide is converted into nontoxic and harmless nitrogen, the treatment method is safe, green and environment-friendly, meets the national environmental protection standard, the problem of pollution of the nitrogen oxide waste gas generated in the existing enameled wire production process to the environment is solved, the treatment device is simple in structure, long in service life and low in operation cost, thereby achieving the purposes of energy conservation and emission reduction.
Description
Technical Field
The invention relates to the technical field of waste gas treatment, in particular to a device and a method for treating nitric oxide for a high-speed wire coating machine.
Background
Nitrogen oxides refer to compounds consisting of only two elements, nitrogen and oxygen, and include various compounds, such as nitrous oxide (N)2O), Nitric Oxide (NO), nitrogen dioxide (NO)2) Dinitrogen trioxide (N)2O3) Dinitrogen tetroxide (N)2O4) And dinitrogen pentoxide (N)2O5) And other nitrogen oxides except nitrous oxide and nitrogen dioxide are unstable and change into nitrogen dioxide and nitric oxide when exposed to light, moisture or heat, and nitric oxide changes into nitrogen dioxide. Nitrogen oxides all have varying degrees of toxicity.
With the progress of global industrialization, environmental problems are becoming more severe, and even more so, atmospheric pollution, which is one of the major environmental problems, poses a great threat to human health and ecological environment. Nitrogen oxide waste gas is one of the main sources of air pollution, the emission amount of the nitrogen oxide waste gas is increased year by year in recent years, and not only is the nitrogen oxide waste gas one of the main sources of acid rain, but also is a carcinogen, which can cause photochemical smog and damage the ozone layer. Corresponding policies and regulations are made and modified in China governments and places in disputes, and increasingly strict limits are made on the total emission amount and the emission concentration of the nitrogen oxide waste gas, so that the treatment of the nitrogen oxide waste gas becomes a difficult problem which nitrogen oxide waste gas emission enterprises have to face. Generally, nitrogen oxide exhaust gas produced industrially contains nitrogen monoxide and nitrogen dioxide as main components, and also contains a small amount of other nitrogen oxides.
At present, the production of electromagnetic wire products is related to, especially, during the production process of enameled wires, a large amount of nitrogen oxides are discharged, the enameled wires are the main raw materials of products such as motors and electric appliances, and the market demand is very large. The production process of the enameled wire is paying off → annealing → cleaning → painting → baking → cooling → lubricating → taking up, the paint for the high-temperature wire is polyester imide paint or polyamide imide paint, and NO is generated during the catalytic combustion of the paintXThe nitrogen oxide mixed gas and a small amount of sulfur dioxide gas have certain toxicity, and the surrounding environment and the physical health of workers are seriously affected. At the present stage, enameled wire production line enterprises often select remote areas from plant sites, and the generated nitrogen oxide waste gas is basically directly discharged into the atmosphere, thereby seriously polluting the environment. With the increase of environmental governance in countries and places, enameled wire production line enterprises must also begin to purify nitrogen oxide waste gas.
How to purify the nitrogen oxide waste gas that high-speed enameled wire machine discharged, solve environmental pollution's problem, improve the production environment to ensure to reach national environmental protection requirement, improve production efficiency simultaneously, guarantee the good operational environment of operating personnel, be the problem that needs the solution at present urgently.
Therefore, the research and development of a device and a method for treating nitrogen oxide waste gas for a high-speed wire enameling machine are urgently needed, and meanwhile, the device also needs to fully utilize the characteristic that the temperature of tail gas discharged by the high-speed wire enameling machine is high, and the efficiency of catalytic reduction of nitrogen oxide is improved by designing a primary treatment component and a secondary treatment component to work in series, so that the purposes of energy conservation and emission reduction are achieved.
Disclosure of Invention
The invention aims to solve the existing problems and provides a device and a method for treating nitrogen oxide waste gas for a high-speed wire coating machine.
The technical solution of the invention is as follows:
a nitric oxide waste gas treatment device for a high-speed wire enamel machine comprises a treatment unit, wherein the treatment unit sequentially comprises an air inlet pipe, a primary treatment component and a secondary treatment component according to a waste gas treatment process;
the air inlet pipe is provided with a waste gas inlet and is connected with a waste gas outlet of a high-speed enamelling machine, a reducing agent spraying interface is arranged on the side wall of the air inlet pipe, which is close to the waste gas inlet, and the air inlet pipe is connected with a primary treatment member;
the preliminary treatment component comprises a metal mesh catalytic layer;
the secondary treatment component comprises a secondary treatment component body, wherein a secondary treatment component air inlet and a tail gas outlet are formed in the secondary treatment component body, a primary treatment component air outlet is fixedly communicated with the secondary treatment component air inlet, and a heating device and a honeycomb ceramic catalyst layer are fixed in the secondary treatment component body.
Preferably, the number of the processing units is the same as the number of the exhaust ports of the high-speed enamelling machine, and a plurality of mutually independent processing units are fixed in the housing.
Preferably, the reducing agent spraying interface is connected with a compression atomization device, one end of the compression atomization device, which is far away from the reducing agent spraying interface, is connected with a flow meter, and one end of the flow meter, which is far away from the compression atomization device, is communicated with a reducing agent storage tank.
Preferably, an observation port is formed in one side, adjacent to the reducing agent spraying port, of the air inlet pipe, and a transparent observation plate is fixed at the observation port in a sealing mode.
Preferably, a condensation port is formed in the air inlet pipe on the same side as the waste gas inlet, a return pipe is fixed at the condensation port, and the return pipe is connected with the liquid collecting tank.
Preferably, the metal mesh catalyst layer is internally densely distributed with irregularly arranged meshes which are crisscrossed in the longitudinal direction and the transverse direction, and is composed of a wire mesh, a steel wire mesh, a stainless steel wire mesh, a copper wire mesh, an aluminum alloy wire mesh or foamed nickel, wherein the metal mesh catalyst layer is loaded with one or more of simple substances or compounds of platinum, palladium and rhodium, and the mass percentage of the simple substances or compounds is 0-0.5%.
Preferably, the air inlet pipe comprises an air inlet pipe body front section and an air inlet pipe body rear section fixed on the air inlet pipe body front section, a first support used for supporting is fixed on the portion, close to the air inlet pipe body rear section, inside the air inlet pipe body rear section, close to the air inlet pipe body front section, a limiting strip is fixed on the portion, close to the air inlet pipe body rear section, inside the air inlet pipe body rear section, and the distance between the limiting strip and the first support is matched with the height H of the metal mesh catalyst layer.
Preferably, the honeycomb ceramic catalyst layer is formed by stacking a plurality of ceramic honeycomb catalyst blocks with surfaces covered with metal compounds, the ceramic honeycomb catalyst blocks are loaded with metal compound layers, the metal compound layers are one or more of simple substances or compounds of copper, manganese, nickel, cobalt, platinum, palladium and rhodium, and the mass percentage of the metal compound layers is 0-1%.
Preferably, a second support for supporting is fixed inside the secondary treatment member body, a mesh-shaped support plate is placed on the second support, the ceramic honeycomb catalyst blocks are stacked on the mesh-shaped support plate, and a gap between the ceramic honeycomb catalyst block and the inner wall of the secondary treatment member body is filled with asbestos.
A method for treating nitrogen oxide waste gas for a high-speed wire enamelling machine comprises the following specific steps:
s1: preparing a reducing agent solution;
s2: atomizing the reducing agent solution prepared in the step S1, enabling the atomized reducing agent and the nitrogen oxide to be treated to flow in zigzag, staggered and irregular meshes in the metal mesh catalytic layer, dispersing and mixing uniformly in the flowing process, and performing primary treatment under the action of the metal mesh catalytic layer;
s3: and (4) heating the gas subjected to the primary treatment in the step S2 by a heating device, heating the gas, allowing the gas to enter the honeycomb ceramic catalyst layer for secondary treatment, and finally discharging nitrogen and water.
The invention has the advantages of
1. The invention discloses a nitrogen oxide waste gas treatment device for a high-speed wire enamel machine, which comprises a treatment unit, the treatment unit comprises an air inlet pipe, a primary treatment component and a secondary treatment component in turn according to the waste gas treatment process, after the nitrogen oxide waste gas to be treated passes through a metal mesh catalyst layer, a heating device and a honeycomb ceramic catalyst layer in turn, finally the discharged gas is nitrogen and water, thereby achieving the purpose of removing nitrogen oxide, realizing harmless, safe, rapid and high-efficiency treatment, the treatment process is simple, the nitrogen oxide is converted into non-toxic and harmless nitrogen, the treatment method is safe, green and environment-friendly, the environment-friendly treatment method meets the environmental protection standard specified by the state, the problem of pollution of the nitrogen oxide to the environment in the existing enameled wire production process is solved, and the treatment device is simple in structure, is beneficial to production and manufacture and is also beneficial to market popularization.
2. The invention discloses a method for treating nitrogen oxides of a high-speed wire enamelling machine, wherein atomized reducing agents and nitrogen oxide waste gases to be treated flow in zigzag, staggered and irregular meshes in a metal mesh catalyst layer, are dispersed and mixed uniformly in the flowing process, are subjected to preliminary treatment under the action of the metal mesh catalyst layer, and the effects of dispersion, mixing uniformity, sufficiency and preliminary treatment are realized in one step by skillful arrangement of the mesh structure of the metal mesh catalyst layer, so that high efficiency is realized.
3. The device also needs to fully utilize the characteristic of high temperature of tail gas discharged by the high-speed wire enamelling machine, improves the efficiency of catalytic reduction of nitrogen oxides by designing a primary treatment component and a secondary treatment component to work in series, and achieves the purposes of energy conservation and emission reduction.
Drawings
FIG. 1 is a schematic perspective view of a nitrogen oxide waste gas treatment device for a high-speed wire coating machine according to the present invention;
FIG. 2 is a schematic perspective view of the inside of a nitrogen oxide waste gas treatment device for a high-speed wire coating machine according to the present invention;
FIG. 3 is a cross-sectional view of the air inlet tube of the present invention;
FIG. 4 is a cross-sectional view of a metal mesh catalytic layer of the present invention;
FIG. 5 is a cross-sectional view of a secondary treatment member of the present invention;
FIG. 6 is a schematic view showing a state in which a nitrogen oxide waste gas treatment apparatus for a high-speed wire coating machine according to the present invention is installed in the high-speed wire coating machine.
In the figure: the device comprises an air inlet pipe 1, an exhaust gas inlet 11, a reducing agent spraying interface 12, an observation plate 13, a condensation port 14, an air inlet pipe body front section 15, an air inlet pipe body rear section 16, a first support 17, a limiting strip 18, a metal mesh catalysis layer 2, meshes 21, a tail gas outlet 3, a heating device 4, a honeycomb ceramic catalysis layer 5, a second support 51, a secondary treatment component 7 and an exhaust gas outlet 8.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "inside", "inner", "etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the present invention, unless otherwise expressly specified or limited, the terms "disposed," "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected or detachably connected; may be a mechanical connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
A nitric oxide waste gas treatment device for a high-speed wire enamelling machine comprises a treatment unit, wherein the treatment unit sequentially comprises an air inlet pipe 1, a primary treatment component and a secondary treatment component 7 according to the waste gas treatment process, and the waste gas is the waste gas discharged by the high-speed wire enamelling machine and contains nitric oxide mixed gas and a small amount of sulfur dioxide gas;
the device is characterized in that the air inlet pipe 1 is provided with a waste gas inlet 11, the air inlet pipe 1 is connected with a waste gas outlet 8 of a high-speed enamelling machine, a reducing agent spraying interface 12 is arranged on the side wall of the air inlet pipe 1, which is close to the waste gas inlet 11, and the air inlet pipe 1 is connected with a primary treatment member;
the preliminary treatment component comprises a metal mesh catalyst layer 2, wherein meshes 21 which are irregularly arranged and staggered in the longitudinal and transverse directions are densely distributed in the metal mesh catalyst layer 2, as shown in fig. 4, waste gas to be treated and injected reducing agent enter from the lower surface of the metal mesh catalyst layer 2 and finally flow out from the upper surface of the metal mesh catalyst layer 2, the gas in the metal mesh catalyst layer 2 passes through the zigzag, staggered and irregular meshes, the gas in the two gases is dispersed in the flowing process, the two gases are uniformly mixed, the height H of the metal mesh catalyst layer 2 is 2-3 cm, the metal mesh catalyst layer 2 consists of a wire mesh, a steel wire mesh, a stainless steel wire mesh, a copper wire mesh, an aluminum alloy wire mesh or foamed nickel, wherein one or more simple substances of platinum, palladium, rhodium or compounds are loaded on the metal mesh catalyst layer 2, the mass percentage is 0-0.5%. When the gas flows through the metal mesh catalyst layer 2, the gas is also subjected to preliminary treatment, the reducing agent can be one or more of urea, ammonium carbonate, ammonium bicarbonate, ammonium oxalate and ammonium citrate, and the reducing agent is mixed with water to prepare a reducing agent solution with the concentration of 1-50%. The following is a detailed explanation of the formulation of urea and water into a reducing agent solution:
firstly, decomposing a reducing agent into ammonia gas and nitrogen dioxide under the action of a metal mesh catalyst layer 2;
secondly, part of the nitrogen oxides are reduced by ammonia under the action of the metal mesh catalyst layer 2 to generate harmless nitrogen and water:
and thirdly, reacting nitrogen dioxide with water to obtain nitric acid and nitrous acid:
fourthly, carbon monoxide, nitrogen and water generated by the reaction of nitrous acid and a reducing agent, wherein nitrogen oxides are reduced by the carbon monoxide under the action of the metal mesh catalyst layer 2 to generate harmless carbon dioxide and nitrogen:
the temperature of the waste gas from the high-speed enamelling machine is generally between 260 and 300 ℃, so that the temperature can be ensured in the primary treatment process.
The secondary treatment component 7 comprises a secondary treatment component body, a secondary treatment component air inlet and a tail gas outlet 3 are arranged on the secondary treatment component body, an air outlet of the primary treatment component is fixedly communicated with the secondary treatment component air inlet, a heating device 4 and a honeycomb ceramic catalyst layer 5 are fixed in the secondary treatment component body, the heating device 4 is close to the secondary treatment component air inlet and comprises a plurality of heating tubes and a temperature sensor, the required temperature in the reaction process is ensured, the form is also ensured to be in a gaseous state, the temperature is controlled to be 250-300 ℃, and although the temperature of the waste gas from the high-speed enamelling machine is generally 260-300 ℃, the temperature of the waste gas cannot be ensured to be within 250-300 ℃;
the honeycomb ceramic catalyst layer 5 is formed by stacking a plurality of ceramic honeycomb catalyst blocks of which the surfaces are covered with metal compounds, the ceramic honeycomb catalyst blocks are loaded with metal compound layers, the metal compound layers are one or more of simple substances or compounds such as copper, manganese, nickel, cobalt, platinum, palladium or rhodium, the mass percentage of the metal compound layers is 0-1%, the ceramic honeycomb catalyst blocks are conventionally arranged in the field, and therefore, the ceramic honeycomb catalyst blocks are not described in detail, and the specific steps are as follows:
the urea can reduce nitrogen oxides under the action of a ceramic honeycomb catalytic block loaded with metal compounds to generate harmless carbon dioxide, nitrogen and water:
secondly, decomposing the reducing agent into ammonia gas and carbon dioxide under the action of the ceramic honeycomb catalytic block loaded with the metal compound;
thirdly, the ammonia gas can reduce nitrogen oxides under the action of the ceramic honeycomb catalytic block loaded with the metal compound to generate harmless nitrogen and water:
fourthly, the carbon monoxide produced in the reaction process can reduce nitrogen oxides under the action of the ceramic honeycomb catalytic block loaded with metal compounds to generate harmless carbon dioxide, nitrogen and water:
therefore, the nitrogen oxide treated by the nitrogen oxide waste gas treatment device for the high-speed enameled wire machine is finally discharged in a nitrogen and water mode, the purpose of removing the nitrogen oxide is achieved, harmless, safe, quick and efficient treatment is realized, the treatment process is simple, the nitrogen oxide can be converted into nontoxic and harmless nitrogen gas through one-step reduction, the treatment method is safe, green and environment-friendly, the environmental protection standard specified by the state is met, the problem of pollution of the nitrogen oxide to the environment in the existing enameled wire production process is solved, the treatment device is simple in structure, and the device is beneficial to being put into production and manufacturing and is also beneficial to market popularization.
Specifically, the quantity of the processing unit is the same with the quantity of the waste gas outlet 8 of high-speed enameled wire machine, and a plurality of mutually independent processing units are fixed in the casing, mutually independent between the processing unit, each other do not influence, but independent control, the quantity of processing unit is 4 because the quantity of the gas vent of current high-speed enameled wire machine is 4.
Specifically, the reducing agent is spouted into interface 12 and is linked to each other with compression atomizing device, compression atomizing device keeps away from the reducing agent is spouted into the one end of interface 12 and is connected with the flowmeter, the flowmeter is kept away from compression atomizing device's one end is linked together with the reducing agent liquid reserve tank, the flowmeter is used for monitoring the amount of reducing agent, compression atomizing device is used for atomizing liquid reducing agent, compression atomizing device can be the compression atomizer, the compression atomizer is the conventional equipment in this field, and the event is not adding repeatedly, be connected with the pump head on the reducing agent liquid reserve tank, the reducing agent in the reducing agent liquid reserve tank is pumped from the reducing agent liquid reserve tank to the pump head, and rethread compression atomizing device atomizes and gets into in the intake pipe 1.
Specifically, the reducing agent spouts into interface 12 and is L type tubulose, the spraying end that the reducing agent spouts into interface 12 is located 1 inside central point of intake pipe puts, and moves towards metal mesh catalysis layer 2 to more do benefit to in the reductant of spun can directly get into metal mesh catalysis layer 2, intake pipe 1 with the reducing agent spouts and has seted up the viewing aperture on the adjacent one side of interface 12, viewing aperture department seal fixation has transparent observation board 13, does benefit to the atomization condition of observing the reducing agent.
Specifically, a condensation port 14 is formed in the intake pipe 1 on the same side as the exhaust gas inlet 11, a return pipe is fixed at the condensation port 14 and connected with the liquid collecting tank, so that the liquid reducing agent is collected and reused.
Specifically, the air inlet pipe 1 is a rectangular parallelepiped, and includes a first air inlet pipe body 15 and a second air inlet pipe body 16 fixed to the first air inlet pipe body 15, a first bracket 17 is fixed on the inner part of the first air inlet pipe body 15, which is close to the second air inlet pipe body 16, the first bracket 17 is L-shaped, the number of the first brackets is 4, used for supporting the metal mesh catalyst layer 2, a position limiting strip 18 is fixed inside the second air inlet pipe body 16 and close to the first air inlet pipe body 15, the number of the limiting strips 18 is 2-4, the distance between the limiting strips 18 and the first support 17 is 2-3 CM, the purpose is to match with the height H of the metal mesh catalyst layer 2, the metal mesh catalyst layer 2 is clamped between the two for fixing, the size and the shape of the cross section of the metal mesh catalyst layer 2 are matched with those of the air inlet pipe 1, so that the waste gas and the reducing agent can be ensured to pass through the metal mesh catalyst layer 2.
Specifically, the inside second support 51 that is fixed with of secondary treatment body, second support 51 is the L form, and the quantity is 4 for support, placed netted backup pad on the second support 51, ceramic honeycomb catalysis piece is piled up and is placed on netted backup pad, ceramic honeycomb catalysis piece with the gap between the inner wall of secondary treatment body is filled with the asbestos to can guarantee that gas can carry out abundant processing, the gas that can not appear not handling is discharged from the gap.
Specifically, the stacking mode of the ceramic honeycomb catalytic blocks is 4, and the total number of the ceramic honeycomb catalytic blocks is 8-10, so that gas can be sufficiently treated.
A method for treating nitrogen oxide waste gas for a high-speed wire enamelling machine comprises the following specific steps:
s1: preparing a reducing agent solution, wherein the reducing agent is preferably one or more of urea, ammonium carbonate, ammonium bicarbonate, ammonium oxalate and ammonium citrate, mixing the reducing agent solution with water to prepare the reducing agent solution, and the concentration of the reducing agent solution is 1-50%;
s2: atomizing the reducing agent solution prepared in the step S1, making the atomized reducing agent and the nitrogen oxide to be treated flow in the zigzag, staggered and irregular meshes 21 in the metal mesh catalyst layer 2, dispersing and mixing uniformly in the flowing process, and performing preliminary treatment under the action of the metal mesh catalyst layer 2;
s3: the gas after the primary treatment in step S2 is heated by the heating device 4 and enters the honeycomb ceramic catalyst layer 5 for secondary treatment, and finally nitrogen and water are discharged.
Specifically, the processing procedure in step S1 is:
firstly, decomposing a reducing agent into ammonia gas and nitrogen dioxide under the action of a metal mesh catalyst layer 2;
secondly, part of the nitrogen oxides are reduced by ammonia under the action of the metal mesh catalyst layer 2 to generate harmless nitrogen and water:
and thirdly, reacting nitrogen dioxide with water to obtain nitric acid and nitrous acid:
fourthly, carbon monoxide, nitrogen and water generated by the reaction of nitrous acid and a reducing agent, wherein nitrogen oxides are reduced by the carbon monoxide under the action of the metal mesh catalyst layer 2 to generate harmless carbon dioxide and nitrogen:
specifically, the secondary processing procedure in step S2 is:
the urea can reduce nitrogen oxides under the action of a ceramic honeycomb catalytic block loaded with metal compounds to generate harmless carbon dioxide, nitrogen and water:
secondly, decomposing the reducing agent into ammonia gas and carbon dioxide under the action of the ceramic honeycomb catalytic block loaded with the metal compound;
thirdly, the ammonia gas can reduce nitrogen oxides under the action of the ceramic honeycomb catalytic block loaded with the metal compound to generate harmless nitrogen and water:
fourthly, the carbon monoxide produced in the reaction process can reduce nitrogen oxides under the action of the ceramic honeycomb catalytic block loaded with metal compounds to generate harmless carbon dioxide, nitrogen and water:
by the above treatment mode, the treatment rate reaches more than 85-95%.
In the first embodiment, the waste gas outlet 8 of the high-speed wire-coating machine of a certain wire-coating plant is provided with the nitrogen oxide waste gas treatment device for the high-speed wire-coating machine, and before the nitrogen oxide waste gas treatment device is used, the content of nitrogen oxide in the waste gas is 2600-3000 mg/m-3After the nitrogen oxide exhaust gas treatment device of the present invention is installed and used, it is dischargedThe content of nitrogen oxides in the discharged tail gas is reduced to 150-200mg/m3The device has the advantages that the tail gas finally discharged meets the environmental protection standard specified by the state, and the problem of pollution of nitrogen oxide to the environment in the existing enameled wire production process is solved, so that the device is used for treating the nitrogen oxide waste gas, is safe and environment-friendly, and the treatment device is simple in structure, long in service life and low in operation cost, so that the purposes of energy conservation and emission reduction are achieved.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (10)
1. The utility model provides a high-speed enameled wire machine nitrogen oxide exhaust treatment device which characterized in that: the device comprises a treatment unit, wherein the treatment unit sequentially comprises an air inlet pipe (1), a primary treatment component and a secondary treatment component (7) according to the waste gas treatment process;
the device is characterized in that a waste gas inlet (11) is formed in the gas inlet pipe (1), the gas inlet pipe (1) is connected with a waste gas outlet (8) of a high-speed enamelling machine, a reducing agent spraying interface (12) is formed in the position, close to the waste gas inlet (11), on the side wall of the gas inlet pipe (1), and the gas inlet pipe (1) is connected with a primary treatment member;
the preliminary treatment component comprises a metal mesh catalytic layer (2);
the secondary treatment component (7) comprises a secondary treatment component body, wherein a secondary treatment component air inlet and a tail gas outlet (3) are formed in the secondary treatment component body, a primary treatment component air outlet is fixedly communicated with the secondary treatment component air inlet, and a heating device (4) and a honeycomb ceramic catalyst layer (5) are fixed in the secondary treatment component body.
2. The nitrogen oxide waste gas treatment device for the high-speed wire coating machine according to claim 1, wherein: the number of the processing units is the same as that of the waste gas outlets (8) of the high-speed enamelling machine, and a plurality of mutually independent processing units are fixed in the shell.
3. The nitrogen oxide waste gas treatment device for the high-speed wire coating machine according to claim 1, wherein: the reducing agent spraying interface (12) is connected with a compression atomization device, one end, far away from the reducing agent spraying interface (12), of the compression atomization device is connected with a flow meter, and one end, far away from the compression atomization device, of the flow meter is communicated with a reducing agent liquid storage tank.
4. The nitrogen oxide waste gas treatment device for the high-speed wire coating machine according to claim 1, wherein: an observation port is formed in one side, adjacent to the reducing agent spraying port (12), of the air inlet pipe (1), and a transparent observation plate (13) is fixed at the position of the observation port in a sealing mode.
5. The nitrogen oxide waste gas treatment device for the high-speed wire coating machine according to claim 1, wherein: a condensation port (14) is formed in the air inlet pipe (1) on the same side as the waste gas inlet (11), a return pipe is fixed at the condensation port (14), and the return pipe is connected with a liquid collecting tank.
6. The nitrogen oxide waste gas treatment device for the high-speed wire coating machine according to claim 1, wherein: the metal mesh catalyst layer (2) is densely distributed with meshes (21) which are irregularly arranged and staggered in the longitudinal and transverse directions, the metal mesh catalyst layer (2) is composed of a wire mesh, a steel wire mesh, a stainless steel wire mesh, a copper wire mesh, an aluminum alloy wire mesh or foamed nickel, wherein one or more of single substances or compounds of platinum, palladium and rhodium are loaded on the metal mesh catalyst layer (2), and the mass percentage of the single substances or compounds is 0-0.5%.
7. The nitrogen oxide waste gas treatment device for the high-speed wire coating machine according to claim 1, wherein: intake pipe (1) including intake pipe body anterior segment (15) and be fixed in intake pipe body back end (16) on intake pipe body anterior segment (15), be close to on intake pipe body anterior segment (15) inside intake pipe body back end (16) department is fixed with first support (17) that are used for the support, intake pipe body back end (16) inside is close to intake pipe body anterior segment (15) department is fixed with spacing strip (18), spacing strip (18) with interval between first support (17) with the high H of metal mesh catalysis layer (2) suits.
8. The nitrogen oxide waste gas treatment device for the high-speed wire coating machine according to claim 1, wherein: the honeycomb ceramic catalyst layer (5) is formed by stacking a plurality of ceramic honeycomb catalyst blocks of which the surfaces are covered with metal compounds, wherein metal compound layers are loaded on the ceramic honeycomb catalyst blocks, and the metal compound layers are one or more of simple substances or compounds of copper, manganese, nickel, cobalt, platinum, palladium or rhodium, and the mass percentage of the metal compound layers is 0-1%.
9. The nitrogen oxide waste gas treatment device for the high-speed wire coating machine according to claim 8, wherein: a second support (51) for supporting is fixed inside the secondary treatment member body, a latticed support plate is placed on the second support (51), the ceramic honeycomb catalytic blocks are stacked on the latticed support plate, and gaps between the ceramic honeycomb catalytic blocks and the inner wall of the secondary treatment member body are filled with asbestos.
10. A method for treating nitrogen oxide waste gas for a high-speed wire coating machine is characterized by comprising the following steps: the method comprises the following specific steps:
s1: preparing a reducing agent solution;
s2: atomizing the reducing agent solution prepared in the step S1, enabling the atomized reducing agent and the nitrogen oxide to be treated to flow in zigzag, staggered and irregular meshes (21) in the metal mesh catalyst layer (2), dispersing and mixing uniformly in the flowing process, and performing primary treatment under the action of the metal mesh catalyst layer (2);
s3: and (4) heating the gas subjected to the primary treatment in the step S2 by a heating device (4), heating the gas, allowing the gas to enter a honeycomb ceramic catalyst layer (5) for secondary treatment, and finally discharging nitrogen and water.
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3928239A (en) * | 1972-11-30 | 1975-12-23 | Nippon Catalytic Chem Ind | Method for the production of exhaust and waste gases purifying catalysts |
| CN1353006A (en) * | 2000-11-06 | 2002-06-12 | Omg股份两合公司 | Waste gas treatment apparatus of selective catalytic reduction nitrogen oxide and its waste gas treatment method |
| CN101362051A (en) * | 2008-09-27 | 2009-02-11 | 上海东化环境工程有限公司 | Acrylonitrile device tail-gas treatment technique |
| CN106731798A (en) * | 2016-12-26 | 2017-05-31 | 北京神雾环境能源科技集团股份有限公司 | Granule materials Industrial Boiler flue gas denitrification system and method for denitration |
| CN107227996A (en) * | 2016-03-24 | 2017-10-03 | 华玉娣 | The exhaust gas filter of the good purification of effective denitrification |
| CN107288720A (en) * | 2016-04-05 | 2017-10-24 | 华玉娣 | The high exhaust purifier of discharge standard |
| CN110586199A (en) * | 2019-10-12 | 2019-12-20 | 无锡威孚环保催化剂有限公司 | Waste gas treatment catalyst for combined enameled wire machine and preparation method thereof |
| CN111111401A (en) * | 2019-12-24 | 2020-05-08 | 安徽掌融通讯科技有限公司 | Harmless and efficient treatment method for nitrogen oxides in industrial waste gas |
| CN215962967U (en) * | 2021-08-23 | 2022-03-08 | 湖州乙戈环保设备有限公司 | Processing apparatus of nitrogen oxide waste gas for high-speed wire enamel machine |
-
2021
- 2021-08-23 CN CN202110966662.4A patent/CN113617224A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3928239A (en) * | 1972-11-30 | 1975-12-23 | Nippon Catalytic Chem Ind | Method for the production of exhaust and waste gases purifying catalysts |
| CN1353006A (en) * | 2000-11-06 | 2002-06-12 | Omg股份两合公司 | Waste gas treatment apparatus of selective catalytic reduction nitrogen oxide and its waste gas treatment method |
| CN101362051A (en) * | 2008-09-27 | 2009-02-11 | 上海东化环境工程有限公司 | Acrylonitrile device tail-gas treatment technique |
| CN107227996A (en) * | 2016-03-24 | 2017-10-03 | 华玉娣 | The exhaust gas filter of the good purification of effective denitrification |
| CN107288720A (en) * | 2016-04-05 | 2017-10-24 | 华玉娣 | The high exhaust purifier of discharge standard |
| CN106731798A (en) * | 2016-12-26 | 2017-05-31 | 北京神雾环境能源科技集团股份有限公司 | Granule materials Industrial Boiler flue gas denitrification system and method for denitration |
| CN110586199A (en) * | 2019-10-12 | 2019-12-20 | 无锡威孚环保催化剂有限公司 | Waste gas treatment catalyst for combined enameled wire machine and preparation method thereof |
| CN111111401A (en) * | 2019-12-24 | 2020-05-08 | 安徽掌融通讯科技有限公司 | Harmless and efficient treatment method for nitrogen oxides in industrial waste gas |
| CN215962967U (en) * | 2021-08-23 | 2022-03-08 | 湖州乙戈环保设备有限公司 | Processing apparatus of nitrogen oxide waste gas for high-speed wire enamel machine |
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