CN112178925A - Smoke exhaust pipeline and water heater - Google Patents
Smoke exhaust pipeline and water heater Download PDFInfo
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- CN112178925A CN112178925A CN202010864838.0A CN202010864838A CN112178925A CN 112178925 A CN112178925 A CN 112178925A CN 202010864838 A CN202010864838 A CN 202010864838A CN 112178925 A CN112178925 A CN 112178925A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/0005—Details for water heaters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/864—Removing carbon monoxide or hydrocarbons
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/88—Handling or mounting catalysts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J11/00—Devices for conducting smoke or fumes, e.g. flues
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2215/00—Preventing emissions
- F23J2215/40—Carbon monoxide
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2219/00—Treatment devices
- F23J2219/10—Catalytic reduction devices
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- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- Physics & Mathematics (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Catalysts (AREA)
Abstract
The invention discloses a smoke exhaust pipeline and a water heater, wherein the smoke exhaust pipeline comprises a plurality of smoke pipes and a purification section bridged between the smoke pipes, a purification medium at least partially covering the cross section of the smoke exhaust pipeline is arranged in the purification section, and a base material of the purification medium is made of metal. The purification medium provided by the invention takes a metal material as a substrate, and after the metal substrate is specially treated, an environment suitable for catalyzing the load of active components of CO is formed on the surface of the metal substrate, so that the production process is simplified; in addition, an integrally formed mounting part can be formed by utilizing the forming process of the metal matrix so as to realize the connection between the purification medium and the purification section and simplify the mounting structure; and the design of the sectional type smoke exhaust pipeline also reduces the difficulty of replacing and purifying media, and is suitable for popularization and use.
Description
Technical Field
The invention belongs to the technical field of CO purification, and particularly relates to a smoke exhaust pipeline and a water heater; the smoke exhaust pipeline comprises a purification section containing a purification medium and a smoke pipe connected with the purification section, and an integrally formed mounting part can be formed by utilizing the forming process of a purification medium metal base body, so that the connection between the purification medium and the smoke exhaust pipeline is realized, and the mounting structure is simplified; and the sectional smoke exhaust pipeline design also reduces the difficulty of replacing and purifying the medium.
Background
With the improvement of consumption level and pursuit of living standard, the water heater is an indispensable household appliance in general household life at present, and as for the energy sources commonly used by the water heater, the commonly used energy sources comprise gas, electric heat and solar energy, but based on the convenience of use and based on the consideration of energy cost, the gas water heater is the most widely applied product at present.
When the weather turns cold or in winter in the north, when a user uses the gas water heater, the door and the window in the house are closed, the oxygen content in the indoor air is easily reduced, and the gas is not sufficiently combusted to generate a large amount of carbon monoxide gas, so that the human health is harmed. Therefore, the CO content in the flue gas is often reduced by adopting an improved combustion method or adding a purification device.
The existing CO purification media applied to the gas water heater adopt a ceramic matrix framework, and the CO purification effect is obvious when the load is large and the temperature of flue gas is higher. However, when the water heater is low in load and the smoke temperature is low, the CO purification effect is poor, the ceramic matrix framework is limited by the forming process, the ceramic matrix structure occupies a larger volume to achieve specific strength, the resistance of smoke emission is increased, and therefore the work of the water heater is influenced.
In addition, when the CO purification medium of the existing ceramic matrix skeleton is applied to a smoke exhaust pipeline, a mounting structure for fixing the purification medium needs to be additionally arranged in the smoke pipe, so that the cost of each item of the purification smoke pipe is undoubtedly increased. When the CO purification media arranged in the integrated smoke exhaust pipeline need replacement due to the service life problem, the whole smoke pipe needs to be replaced frequently, so that the difficulty of after-sale maintenance of products is improved, and the acceptable degree of customers to related after-sale services is reduced.
The present invention has been made in view of this situation.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a sectional smoke exhaust pipeline, which comprises a detachable purification section, wherein a purification medium made of metal base materials is arranged in the purification section. After the metal matrix of the purification medium is specially treated, an environment suitable for catalyzing the load of active components of CO is formed on the surface of the metal matrix, so that the production process is simplified; in addition, the integrally formed mounting part can be formed by utilizing the forming process of the metal base body so as to realize the connection between the purification media and the purification section, and the mounting structure is simplified.
In order to solve the technical problems, the invention adopts the technical scheme that:
the invention provides a smoke exhaust pipeline which comprises a plurality of smoke pipes and a purification section bridged between the smoke pipes, wherein a purification medium at least partially covering the cross section of the smoke exhaust pipeline is arranged in the purification section, and a base material of the purification medium is made of metal.
In the scheme, the smoke exhaust pipeline provided by the invention is characterized in that the detachable purification section is connected with the common smoke pipe, and the purification medium can be replaced after the purification medium reaches the service life. And the other purpose of the design is that a plurality of purification sections can be arranged on the smoke exhaust pipeline according to the actual use effect so as to further increase the smoke purification effect. In addition, in the smoke exhaust pipeline using a plurality of purification sections, the arrangement mode of the purification media in each purification section can be adjusted according to the use requirement so as to improve the purification effect.
The further scheme of the invention is as follows: the purification medium comprises a honeycomb-shaped metal matrix loaded with catalytic active components, and the periphery of the metal matrix is connected with the inner peripheral wall of the purification section through an installation part; preferably, the mounting portion is integrally formed with the metal base.
In the scheme, the CO purification medium provided by the invention adopts the metal material with the porous structure as the matrix, and the metal material can still maintain the strength higher than that of ceramic under the condition of thinner thickness, so that a matrix framework with smaller space occupation can be provided in a limited pipeline space while the CO purification medium is endowed with good strength, and the resistance of airflow passing through the CO purification medium is also reduced; in addition, the active component for purifying CO needs to be loaded by a certain catalytic carrier, and the surface of the pore structure of the metal matrix adopted by the invention can just form a thin layer with the same component as the catalytic carrier through certain oxidation treatment, so that the subsequent process for loading the active component is simplified. The oxidation treatment is usually carried out by calcining after acid washing. Furthermore, when the purifying medium of the ceramic substrate is loaded into the smoke tube in the prior art, an additional mounting structure is required to be arranged; and this application owing to use the purification media who uses the metal as the base member, consequently at metal base member shaping stage, can be at its specific position integrated into one piece shaping play mounting structure, compare prior art and greatly simplified the design of tobacco pipe interior purification section.
The further scheme of the invention is as follows: the honeycomb metal base body is in a strip shape or a column shape and is parallel to the axial direction of the purification section or forms a certain included angle with the axial direction of the purification section.
In the scheme, the base body is of the honeycomb metal structure, and the thickness of the metal material forming the hole structure is thinner, so that the number of the hole structures can be increased in a limited pipeline space, and the resistance of a purification medium for air flow to pass through cannot be influenced. In addition, in order to reduce the air flow resistance better, the axes of the honeycomb holes of the metal matrix are arranged parallel to the air flow direction, i.e. parallel to the axial direction of the purification section. In order to further increase the contact between the flue gas and the purification media, the metal matrix and the purification section can be axially arranged at a certain included angle, so that the purification effect is improved.
The further scheme of the invention is as follows: the honeycomb metal matrix is formed by welding a plurality of metal plates after being folded for many times, and a honeycomb pore channel is formed by gaps at the folding position of the metal plates for smoke to pass through; preferably, the metal plate extends outward from the outer periphery of the metal base to form the mounting portion.
In the above scheme, the honeycomb metal structure can be made by the following method:
A. selecting a metal sheet with the thickness of 0.1-0.2 mm;
B. uniformly coating solder and a solder resist support material on the surface of the metal sheet by using a coating machine;
C. b, cutting the thin plate coated in the step B into long metal strips with specific widths according to requirements, and folding the long metal strips into different shapes according to the coating conditions of the solder and the solder resist support material;
D. c, the thin plates folded in the step C are placed in an inert gas environment according to the position alignment, and are welded at the temperature of 1100 ℃ to form a honeycomb plate, wherein the part coated with the solder mask support material forms the inner peripheral wall and part of the outer peripheral wall of the hole;
E. and D, cutting and aligning the honeycomb plate prepared in the step D, welding the honeycomb plate in a square fixing frame, and carrying out oil washing and blow drying to obtain the honeycomb metal framework.
In the scheme, the folded metal plates are arranged in a certain sequence and then welded, a plurality of gaps are formed at the folded positions after the folded metal plates are spliced with each other, namely honeycomb-shaped pore channels, the pore channels can be one or a mixture of a triangle, a rectangle, a hexagon, a circle and an ellipse according to different arrangement and folding forms, and the thickness of the pore walls is the same as that of the metal thin plate and is within the range of 0.1-0.2 mm. Furthermore, because the honeycomb metal base is formed by welding stacked metal plates, a metal plate with a larger block size than other metal plates can be selected, a part of the metal base is formed by folding, and the unfolded part can be used as an installation part of the metal base after the honeycomb metal base is formed.
The further scheme of the invention is as follows: the purification section is internally provided with a plurality of installation parts which are connected with the axis in an intersecting way, and the installation position of the purification medium on the installation parts is positioned between the axis and the inner peripheral wall.
Among the above-mentioned scheme, extend from the interior perisporium of purification section axial to purification section and be equipped with a plurality of installation departments that the direction is different for form many installation ribs that outwards disperse from the cross-section center on the radial cross-section of purification section, all can set up the purification media on each installation rib. For example, three mounting ribs which intersect with the axis may be provided, the included angle of adjacent mounting ribs in the radial direction of the purification section is 120 °, and each mounting rib includes a purification medium; or two pieces of mounting ribs which are vertically crossed in the radial direction of the purification section can be arranged, and the crossed point is overlapped with the axis.
The further scheme of the invention is as follows: the installation department is for the independent sheetmetal that links to each other with the interior perisporium of purification section, is equipped with the trompil with honeycomb metal base matched with on it, the gap looks joint of trompil edge and honeycomb metal base periphery.
In the above-described aspect, the mounting portion may be integrally formed with the metal base of the purification medium, or may be provided separately from the metal base. When the structure is an independent structure, a metal sheet can be used as the mounting part, and at least one end of the metal sheet is connected with the inner peripheral wall of the purification section. In addition, because the honeycomb-shaped metal base body is formed by folding, arranging and welding a plurality of metal plates according to a certain mode, gaps formed among the metal plates exist at the edges of the honeycomb-shaped metal base body, and the gaps can be clamped with the edges of the holes on the metal plates to realize the connection of the purification media and the mounting part.
The further scheme of the invention is as follows: the internal perisporium of purifying the section is equipped with along circumference open-ended draw-in groove, and the installation department is close to purifying being equipped with the kink of section internal perisporium, the kink with the opening of draw-in groove is pegged graft mutually and is set up.
In the above-mentioned scheme, the installation department is mostly with purification media integrated into one piece's metal sheet, or independent sheetmetal, the one end of sheetmetal can be with inner peripheral wall welding. And in order to further simplify the structure of purifying the section, can with the one end bending type setting that the sheet metal is close to purifying the section internal perisporium, only need set up the draw-in groove structure in purifying the corresponding position of section internal perisporium this moment, can realize the installation department and be connected of purifying the section, and this kind of connected mode is easily installed and is dismantled, can further reduce the cost of purifying the section. The clamping groove structure can weld a middle-section convex metal strip on the inner peripheral wall of the purification section, and a gap formed between the middle-section convex part and the inner peripheral wall of the purification section is a clamping groove with openings at two sides and can be matched with installation parts with different bending directions.
The further scheme of the invention is as follows: the purification media completely cover the cross section of the smoke exhaust pipeline, and the outer periphery of the honeycomb metal base body is in interference fit with the inner peripheral wall of the purification section through an installation part formed by extending metal plates.
In the above scheme, the honeycomb-shaped metal matrix can also be a net structure completely covering the radial direction of the smoke exhaust pipeline, and according to the description of the forming mode of the purification medium, the honeycomb-shaped metal matrix is actually formed by splicing a plurality of folded metal plates, and the metal plates with proper length can be reserved on the periphery of the honeycomb-shaped metal matrix during forming, so that at least part of the periphery of the honeycomb-shaped metal matrix is larger than the inner diameter of the purification section, and the interference fit of the honeycomb-shaped metal matrix and the purification section is realized.
The further scheme of the invention is as follows: the purification section is of a cylindrical structure, and threads matched with the smoke pipe are arranged on the two ends of the purification section in the circumferential direction.
The invention also includes a method for preparing the purification medium, which comprises the following steps:
(1) adding the active component and the doping agent into the acid solution, and uniformly stirring to prepare a coating solution;
(2) after acid washing, calcining the metal matrix at the temperature of 500-800 ℃ to generate a catalytic carrier on the surface of the metal matrix;
(3) and (2) coating the coating liquid prepared in the step (1) on a metal substrate, and calcining at the temperature of 300-450 ℃ to prepare the CO purification medium.
According to the preparation method, a catalytic carrier is added in the step (1) when the coating liquid is prepared, and the active component, the catalytic carrier and the doping agent are added into the acid solution to be uniformly mixed and then are kept stand for reaction for 18-24 hours; the mass ratio of the active component to the catalytic carrier and the dopant is 1-10: 70-98: 1-20 in terms of metal elements.
In the above scheme, since the catalytic carrier for supporting the active component is already formed on the surface of the metal substrate after the oxidation treatment, the solution containing the active component can be directly coated on the surface of the metal substrate. In another embodiment of the present invention, the inventors add a certain proportion of catalytic carriers to the coating solution, which makes the surface of the metal substrate carrying the coating solution have more catalytic carrier components, and in the subsequent calcination process, the catalytic carriers on the surface of the metal substrate and the externally added catalytic carriers form eutectic at high temperature, thereby improving the binding capacity of the metal substrate to the active component.
According to the preparation method, in the step (3), the coating comprises scouring or dipping, wherein the scouring is to scour the metal substrate treated in the step (2) by coating liquid at the flow rate of 6-12L/min, and the dipping is to immerse the metal substrate treated in the step (2) into the coating liquid prepared in the step (1) for 9-13 min; in the coated metal matrix, the loading amount of the coating liquid is 300-500 g/L; after the metal matrix is washed or impregnated, redundant coating liquid which is not combined by the metal matrix is swept by air flow.
In the scheme, the coating liquid has certain viscosity, part of the coating liquid is adhered to the metal surface after flowing through the metal honeycomb, and part of the coating liquid floating on the surface can be sent to the honeycomb holes through high-pressure air flow blowing; meanwhile, the excessive liquid left in the honeycomb due to the surface tension of the liquid can be blown away, and only a layer of coating liquid is formed on the surface of the metal honeycomb pore structure. Because the mass and the density of the honeycomb-shaped metal matrix are not convenient to be calculated, the loading amount is calculated by taking the honeycomb-shaped metal matrix with the volume of 1L as a standard, and therefore the loading amount is 300-500 g/L: after coating, the weight of the coating liquid in a honeycomb metal matrix with the volume of 1L is increased by 300-500 g. And (4) loading the metal matrix on the coating liquid calcined in the step (3) by 80-150 g/L.
According to the preparation method, in the step (1), the solvent of the acidic solution is selected from one or more of water, acetonitrile and propylene carbonate, the solute of the acidic solution is nitric acid or chromic acid, and the volume fraction is 7-12%; in the step (2), the volume fraction of the acid solution used for acid washing is 8-14%, and the acid washing time is 3-8 min.
In the scheme, the acidic solution added in the step (1) provides an acidic environment for the coating solution, so that a mixed system is formed among the catalytic carrier, the active component and the doping agent in advance, the active component is uniformly dispersed in the coating solution, the binding force between the coating solution and the catalytic carrier obtained by oxidizing the surface of the metal matrix is improved, and the loading capacity of a subsequent coating process is improved.
According to the above preparation method, the active component is selected from palladium nitrate and/or platinum nitrate; the dopant is rare earth oxide selected from CeO2、ZrO2、Ga2O3、Y2O3、La2O3、Nd2O3、Sm2O3One or more of them.
In the scheme, the doping agents are all rare earth oxides with higher specific surface area, and can promote the dispersion and the adhesion of active components on the surface of the metal matrix, so that the catalytic efficiency is improved.
The invention also provides a water heater, and the water heater is provided with the smoke exhaust pipeline.
After adopting the technical scheme, compared with the prior art, the invention has the following beneficial effects:
1. the smoke exhaust pipeline provided by the invention is characterized in that the detachable purification section is connected with the common smoke pipe, and the purification medium can be replaced after the purification medium reaches the service life. The other purpose of the design is that a plurality of purification sections can be arranged on the smoke exhaust pipeline according to the actual use effect so as to further increase the smoke purification effect;
2. the smoke exhaust pipeline provided by the invention uses the purification medium taking metal as a base body, so that the installation structure can be integrally formed at a specific position of the metal base body in the forming stage of the metal base body, and compared with the prior art, the design of the purification section in the smoke pipe is greatly simplified;
3. the CO purification medium provided by the invention adopts the metal material with the porous structure as the matrix, and the metal material can still maintain the strength higher than that of ceramic under the condition of thinner thickness, so that a matrix framework with smaller occupied space volume can be provided in a limited pipeline space while the CO purification medium is endowed with good strength, and the resistance of airflow passing through the CO purification medium is also reduced; in addition, the active component for purifying CO needs to be loaded by a certain catalytic carrier, and the surface of the pore structure of the metal matrix adopted by the invention can just form a thin layer with the same component as the catalytic carrier through certain oxidation treatment, so that the subsequent process for loading the active component is simplified.
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention, are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without limiting the invention to the right. It is obvious that the drawings in the following description are only some embodiments, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
FIG. 1 is a schematic view, partly in section, of a purification section according to the invention;
FIG. 2 is a schematic diagram of the construction of a purification media metal matrix according to the present invention;
FIG. 3 is an exploded view of the mounting portion and the purification media of the present invention;
FIG. 4 is a schematic view of a radial cross-sectional structure of a purification section provided in example 2 of the present invention;
FIGS. 5 and 6 are schematic views showing the radial cross-sectional structure of the purification section provided in example 3 of the present invention;
FIG. 7 is a schematic view of a radial cross-sectional structure of a purification stage provided in example 4 of the present invention.
In the figure: 1-purification media, 2-installation department, 21-kink, 22-trompil, 3-metal base, 4-purification sections, 41-draw-in groove, 5-screw thread.
It should be noted that the drawings and the description are not intended to limit the scope of the inventive concept in any way, but to illustrate it by a person skilled in the art with reference to specific embodiments.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the following embodiments are used for illustrating the present invention and are not intended to limit the scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1 to 7, the present invention provides a sectional smoke exhaust duct, which comprises a detachable purification section, wherein a purification medium made of metal base material is disposed in the purification section. After the metal matrix of the purification medium is specially treated, an environment suitable for catalyzing the load of active components of CO is formed on the surface of the metal matrix, so that the production process is simplified; in addition, the integrally formed mounting part can be formed by utilizing the forming process of the metal base body so as to realize the connection between the purification media and the purification section, and the mounting structure is simplified.
Example 1
In the embodiment, a smoke exhaust pipeline is provided, the smoke exhaust pipeline includes a plurality of smoke tubes and a purification section 4 bridged between the smoke tubes, a purification medium 1 at least partially covering the cross section of the smoke exhaust pipeline is arranged in the purification section, and a base material of the purification medium 1 is made of metal.
In the embodiment, the smoke exhaust pipeline provided by the invention is characterized in that the detachable purification section 4 is connected with a common smoke pipe, so that the purification medium 1 can be replaced after the purification medium reaches the service life. And the other purpose of the design is that a plurality of purification sections 4 can be arranged on the smoke exhaust pipeline according to the actual use effect so as to further increase the smoke purification effect.
In this embodiment, as shown in fig. 1, the purification medium 1 includes a honeycomb-shaped metal substrate 3 loaded with a catalytically active component, and the outer periphery of the metal substrate 3 is connected to the inner peripheral wall of the purification section 4 via an installation part 2; wherein the mounting part 2 and the metal base 3 are integrally formed.
In this embodiment, the CO purification medium 1 provided by the present invention uses a metal material with a porous structure as a substrate, and the metal material can maintain a strength higher than that of ceramic even in the case of a thin thickness, so that a substrate skeleton with a smaller occupied space volume can be provided in a limited duct space while giving good strength to the CO purification medium 1, and the resistance of the air flow passing through the CO purification medium 1 is also reduced; in addition, the active component for purifying CO needs to be loaded by a certain catalytic carrier, and the surface of the pore structure of the metal matrix adopted by the invention can just form a thin layer with the same component as the catalytic carrier through certain oxidation treatment, so that the subsequent process for loading the active component is simplified. The oxidation treatment is usually carried out by calcining after acid washing. Furthermore, when the purifying medium of the ceramic substrate is loaded into the smoke tube in the prior art, an additional mounting structure is required to be arranged; and this application owing to use the purification media who uses the metal as the base member, consequently at metal base member shaping stage, can be at its specific position integrated into one piece shaping play mounting structure, compare prior art and greatly simplified the design of tobacco pipe interior purification section.
In this embodiment, the honeycomb metal substrate 3 is in a shape of a strip or a column, and is parallel to the axial direction of the purification section 4 or forms a certain included angle with the axial direction of the purification section 4.
In the embodiment, the base body provided by the invention is of a honeycomb metal structure, and the thickness of the hole forming structure made of metal materials is thinner, so that the number of the hole structures can be increased in a limited pipeline space, and the resistance of a purification medium for air flow to pass through cannot be influenced. In addition, in order to reduce the gas flow resistance even better, the axes of the honeycomb cells of the metal base body 3 are arranged parallel to the gas flow direction, i.e. parallel to the axial direction of the purification section 4. In order to further increase the contact between the flue gas and the purification medium 1, the metal matrix 3 and the purification section 4 may be axially disposed at a certain included angle, so as to improve the purification effect.
In this embodiment, as shown in fig. 2, the honeycomb-shaped metal substrate 3 is formed by welding a plurality of metal plates after being folded for many times, and a honeycomb duct is formed by a gap at the folded part of the metal plates for smoke to pass through; wherein the metal plate extends outward from the outer periphery of the metal base body to form the mounting part 2.
In this embodiment, the honeycomb metal structure can be made by the following method:
A. selecting a metal sheet with the thickness of 0.1-0.2 mm;
B. uniformly coating solder and a solder resist support material on the surface of the metal sheet by using a coating machine;
C. b, cutting the thin plate coated in the step B into long metal strips with specific widths according to requirements, and folding the long metal strips into different shapes according to the coating conditions of the solder and the solder resist support material;
D. c, the thin plates folded in the step C are placed in an inert gas environment according to the position alignment, and are welded at the temperature of 1100 ℃ to form a honeycomb plate, wherein the part coated with the solder mask support material forms the inner peripheral wall and part of the outer peripheral wall of the hole;
E. and D, cutting and aligning the honeycomb plate prepared in the step D, welding the honeycomb plate in a square fixing frame, and carrying out oil washing and blow drying to obtain the honeycomb metal framework.
In the embodiment, the folded metal plates are arranged in a certain order and then welded, the folded metal plates are spliced with each other to form a plurality of gaps at the folding position, namely honeycomb-shaped pore channels, the pore channels can be one or a mixture of a triangle, a rectangle, a hexagon, a circle and an ellipse according to different arrangement and folding forms, and the thickness of the pore walls is the same as that of the metal thin plate and is within the range of 0.1-0.2 mm. Further, as shown in fig. 2, since the honeycomb-shaped metal base is formed by welding stacked metal plates, each layer separated by a dotted line in the drawing is a folded metal plate, and a metal plate with a size larger than that of other metal plates is selected from the middle part of the metal base 3 in the drawing, and a part of the metal base 3 is formed by folding the metal plate, and the unfolded part can be used as the mounting part 2 of the metal base after the honeycomb-shaped metal base is formed.
In this embodiment, as shown in fig. 1, the purifying section is a cylindrical structure, and the circumferential direction of both ends of the purifying section is provided with threads 5 matched with the smoke tube.
Example 2
This embodiment is based on embodiment 1 and specifically describes different installation modes of the purification media in the purification section.
In the present embodiment, as shown in fig. 4, a honeycomb-shaped metal base body 3 having a rectangular parallelepiped outer periphery is provided on the axis of the purification stage 4, but unlike embodiment 1, the metal base body 3 and the mounting portion 2 in the present embodiment are not integrally formed.
In this embodiment, as shown in fig. 3, the mounting portion 2 is an independent metal sheet connected to the inner peripheral wall of the purification section 4, and is provided with an opening 22 matched with the honeycomb metal substrate, and the edge of the opening 22 is clamped with a gap on the outer periphery of the honeycomb metal substrate 3.
In this embodiment, the mounting portion 2 is provided independently of the metal base 3, and a metal sheet may be used as the mounting portion 2, and both ends of the metal sheet are connected to the inner peripheral wall of the purification section 4. In addition, because the honeycomb-shaped metal substrate 3 is formed by folding, arranging and welding a plurality of metal plates according to a certain mode, gaps formed among the metal plates exist at the edges of the honeycomb-shaped metal substrate, and the gaps can be clamped with the edges of the openings 22 on the metal plates, so that the purification media 1 are connected with the mounting part 2.
In this embodiment, the inner peripheral wall of the purification section 4 is provided with a clamping groove 41 with an opening along the circumferential direction, the installation section 2 is provided with a bending part 21 near the inner peripheral wall of the purification section 4, and the bending part 21 is inserted into the opening of the clamping groove 41.
In this embodiment, installation department 2 is independent sheetmetal, the both ends setting of buckling that the sheetmetal is close to purification section 4 internal perisporium, only need set up draw-in groove 41 in purification section 4 internal perisporium's corresponding position this moment, can realize installation department 2 and purification section 4's being connected, and this kind of connected mode easily installs and dismantles, can further reduce the cost of purification section. The structure of the clamping groove 41 can weld a middle-section convex metal strip on the inner peripheral wall of the purification section 4, and a gap formed between the middle-section convex part and the inner peripheral wall of the purification section 4 is the clamping groove 41 with openings at two sides and can be matched with the installation part 2 with different bending directions.
Example 3
This embodiment is based on embodiment 1 and specifically describes different installation modes of the purification media in the purification section.
In this embodiment, a plurality of installation parts 2 connected to the axis in an intersecting manner are arranged in the purification section 4, and the installation position of the purification medium 1 on the installation parts 2 is located between the axis and the inner peripheral wall.
In this embodiment, extend from 4 axes of purification section to the internal perisporium of purification section 4 and be equipped with a plurality of installation portions 2 that the direction is different for form many installation ribs that outwards diverge from the cross-section center on the radial cross-section of purification section 4, all can set up purification media 1 on each installation rib. Specifically, as shown in fig. 5, three mounting portions 2 intersecting with the axis may be provided, an included angle of adjacent mounting portions 2 in the radial direction of the purification section 4 is 120 °, and each mounting portion 2 includes a purification medium 1; alternatively, as shown in fig. 6, two mounting portions 2 may be provided which intersect perpendicularly in the radial direction of the purification stage 4, the intersection point being coincident with the axis, and the purification medium 1 being provided on each mounting portion 2 from the axis of the purification stage 4 to the inner peripheral wall.
Example 4
This embodiment is based on embodiment 1 and specifically describes different installation modes of the purification media in the purification section.
In this embodiment, as shown in fig. 7, the purification medium 1 completely covers the cross section of the smoke exhaust duct, and the installation part 2 formed by extending the metal plate on the outer periphery of the honeycomb metal substrate 3 is in interference fit with the inner peripheral wall of the purification section 4.
In this embodiment, the honeycomb-shaped metal matrix 3 may also be a mesh structure completely covering the radial direction of the smoke exhaust duct, and as described in the forming manner of the purification medium 1 in embodiment 1, the honeycomb-shaped metal matrix 3 is actually formed by splicing a plurality of folded metal plates, and a metal plate with a proper length can be reserved on the outer periphery of the honeycomb-shaped metal matrix during forming, so that at least part of the outer periphery of the honeycomb-shaped metal matrix 3 is larger than the inner diameter of the purification section 4, thereby realizing interference fit between the two.
Example 5
In this example, a specific method for preparing the purification media provided herein is provided.
The honeycomb-shaped metal matrix prepared in example 1 was selected as the metal matrix, and the CO purification media were prepared as follows:
(1) active components of palladium nitrate and platinum nitrate (the mass ratio of the palladium nitrate to the platinum nitrate is 1:1) in a mass ratio of 10:85:5, catalytic carrier alumina and a doping agent La2O3And Nd2O3(La2O3And Nd2O3Adding an acid solution, adding nitric acid and hydrochloric acid to adjust the pH to 2.5, uniformly mixing, and standing for 20 hours to obtain a coating solution;
(2) taking 1L of the metal matrix prepared in the example 1, pickling the metal matrix for 6min by using acid liquor with the volume fraction of nitric acid being 10%, and calcining the metal matrix at the temperature of 800 ℃ to generate catalytic carrier alumina on the surface of the metal matrix;
(3) and (3) flushing and coating the coating liquid prepared in the step (1) on the metal substrate treated in the step (2) at the flow rate of 10L/min, then carrying out air flow purging to remove redundant coating liquid, and calcining at the temperature of 450 ℃ to prepare the CO purification medium.
The loading amount of the metal substrate on the coating liquid after coating is 477g/L, and the loading amount on the coating liquid after calcining in the step (3) is 147 g/L.
The CO purification media prepared in this example were loaded into the purification section in the manner of example 4 and applied to the smoke exhaust pipe of a gas water heater, and the change in the flue gas purification effect (in terms of CO concentration in the exhaust flue gas) with the operating time was measured, and the results are shown in the following table:
it can be seen that the flue gas purified by the substrate prepared in example 5 has stable CO content in the discharged flue gas within a short time (1-5 min).
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The smoke exhaust pipeline is characterized by comprising a plurality of smoke pipes and a purification section bridged between the smoke pipes, wherein a purification medium at least partially covering the cross section of the smoke exhaust pipeline is arranged in the purification section, and a base material of the purification medium is made of metal.
2. The smoke exhaust duct according to claim 1, wherein the purification media comprises a honeycomb-shaped metal substrate loaded with a catalytically active component, and the outer periphery of the metal substrate is connected with the inner peripheral wall of the purification section through a mounting part;
preferably, the mounting portion is integrally formed with the metal base.
3. A smoke exhaust duct according to claim 2, wherein said honeycomb metal matrix is in the form of an elongated or cylindrical shape and is arranged parallel to or at an angle to the axial direction of the purification section.
4. The smoke exhaust duct according to claim 3, wherein the honeycomb-shaped metal matrix is formed by welding a plurality of metal plates after being folded for a plurality of times, and the gaps at the folded positions of the metal plates form honeycomb ducts for smoke to pass through;
preferably, the metal plate extends outward from the outer periphery of the metal base to form the mounting portion.
5. A smoke exhaust duct according to claim 4, wherein a plurality of mounting portions are provided in the cleaning section, which are connected to the axis at an intersection, and the mounting position of the cleaning medium on the mounting portions is between the axis and the inner peripheral wall.
6. A smoke exhaust pipe according to claim 2, wherein the mounting part is an independent metal sheet connected with the inner peripheral wall of the purification section, and is provided with an opening matched with the honeycomb metal matrix, and the edge of the opening is clamped with the gap at the outer periphery of the honeycomb metal matrix.
7. A smoke exhaust duct according to any one of claims 2 to 6, wherein the inner peripheral wall of the purification section is provided with a clamping groove which is open along the circumferential direction, the mounting part is provided with a bending part which is close to the inner peripheral wall of the purification section, and the bending part is inserted into the opening of the clamping groove.
8. The smoke exhaust duct according to claim 4, wherein the purification media completely covers the cross section of the smoke exhaust duct, and the installation part formed by extending the metal plates on the outer periphery of the honeycomb metal matrix is in interference fit with the inner peripheral wall of the purification section.
9. The smoke exhaust duct according to claim 1, wherein the purifying section is a cylindrical structure, and threads matched with the smoke tube are arranged on the circumference of the two ends of the purifying section.
10. A water heater, characterized in that the water heater adopts the smoke exhaust pipe of any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010864838.0A CN112178925A (en) | 2020-08-25 | 2020-08-25 | Smoke exhaust pipeline and water heater |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010864838.0A CN112178925A (en) | 2020-08-25 | 2020-08-25 | Smoke exhaust pipeline and water heater |
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| CN202010864838.0A Pending CN112178925A (en) | 2020-08-25 | 2020-08-25 | Smoke exhaust pipeline and water heater |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113899076A (en) * | 2021-10-14 | 2022-01-07 | 广东超人节能厨卫电器有限公司 | Smoke exhaust pipe and gas water heater |
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| EP0164098A2 (en) * | 1984-06-06 | 1985-12-11 | Willy Ufer | Heat exchanger |
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