Porous media burner

Abstract

The present application belongs to the field of combustion technology, and relates to a porous medium burner, which comprises a gas distributor, a shell, and a wind distribution plate arranged in the shell, a first chamber is formed between the shell and the wind distribution plate arranged in the shell, the gas distributor is fixed on the shell and inserted into the first chamber, and the gas distributor is in communication with the first chamber; the gas distributor has a gas distributor bottom surface and a gas distributor side wall, and a plurality of injection holes are arranged on the gas distributor bottom surface and the gas distributor side wall of the gas distributor located in the first chamber, the injection holes on the gas distributor side wall are multilayered to uniformly distribute the gas in the gas distributor to the wind distribution plate. The present application solves the problem of uneven distribution of airflow in the porous medium burner, thereby improving the uniformity of the combustion temperature of the porous medium panel, and especially improving the service life of the porous medium burner.

Description

Technical Field

[0001] This invention belongs to the field of combustion technology and relates to a porous media burner. Background Technology

[0002] Porous media burners are mainly used in drying and baking processes. They have advantages such as uniform heating temperature, high heating efficiency, energy saving, and low pollutant emissions. They can improve the quality of the heated workpiece and fully burn low-calorific-value fuels, and have broad application prospects.

[0003] However, existing porous media burners mainly suffer from uneven panel temperature distribution. After long-term use, the porous media is prone to cracking and damage, which reduces the lifespan of the porous media and increases the maintenance cost of the porous media burner during use.

[0004] Therefore, there is a need to develop a burner structure that can make the combustion temperature distribution of porous media panels more uniform, thereby improving the service life of porous media burners and expanding their application scenarios. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a porous media burner, which effectively solves the problem of uneven airflow distribution inside the porous media burner by designing and improving the distribution of fuel and air inside the burner, thereby improving the uniformity of combustion temperature of the porous media panel and especially improving the service life of the porous media burner.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A porous media burner includes a gas distributor, a housing, and an air distribution plate disposed within the housing. A first chamber is formed between the housing and the air distribution plate disposed therein. The gas distributor is fixed to the housing and inserted into the first chamber, and the gas distributor is connected to the first chamber.

[0008] The gas distributor has a bottom surface and a side wall, and nozzles are provided on both the bottom surface and the side wall of the gas distributor located in the first chamber. The nozzles on the side wall of the gas distributor are multi-layered to evenly distribute the gas in the gas distributor onto the air distribution plate.

[0009] Furthermore, the nozzle includes a bottom nozzle arranged on the bottom surface of the gas distributor and multiple nozzles arranged on the side wall of the gas distributor, and the angle formed by the center lines of the bottom nozzle and the multiple nozzles with the center line of the gas distributor is less than 80°, and the angle of each layer of nozzles in the multiple nozzles gradually decreases along the direction of gas flow.

[0010] Furthermore, the multi-layer nozzle includes an upstream nozzle, a midstream nozzle, and a downstream nozzle on the sidewall. The angle A between the centerline of the upstream nozzle and the centerline of the gas distributor is 60° to 80°, the angle B between the centerline of the midstream nozzle and the centerline of the gas distributor is 40° to 60°, and the angle C between the centerline of the downstream nozzle and the centerline of the gas distributor is 20° to 40°.

[0011] Furthermore, the multi-layer nozzle includes an upstream nozzle and a midstream nozzle on the sidewall. The angle A' between the centerline of the upstream nozzle and the centerline of the gas distributor is 50° to 80°, and the angle B' between the centerline of the midstream nozzle and the centerline of the gas distributor is 10° to 40°.

[0012] Furthermore, the gas distributor has multiple bottom spray holes on its bottom surface, and the angle D between the center line of the bottom spray holes and the center line of the gas distributor is 0° to 20°.

[0013] Furthermore, the air distribution plate has a porous plate structure with a porosity > 50%.

[0014] Furthermore, the air distribution plate is a flat plate or trapezoidal plate structure.

[0015] Furthermore, the gas distributor is also provided with a guide plate, the number of layers of the guide plate is equal to the number of spray holes on the side wall of the gas distributor, the guide plate is arranged on the side of the corresponding spray hole close to the air distribution plate, and the angle formed by each layer of the guide plate and the center line of the gas distributor is equal to the angle formed by the center line of each layer of spray holes on the side wall of the gas distributor and the center line of the gas distributor.

[0016] Furthermore, it also includes a mixer and a flame arrester, the mixer being connected to the flame arrester, the flame arrester being connected to the gas distributor, and the mixer being provided with an air inlet and a gas inlet for mixing gas and air in the mixer.

[0017] Furthermore, it also includes a first porous medium and a second porous medium, wherein the pore size of the first porous medium is smaller than that of the second porous medium; the first porous medium and the second porous medium are arranged adjacent to each other and installed in the housing, and the first porous medium cooperates with the air distribution plate to form a second chamber in the housing.

[0018] The beneficial effects of this invention are as follows:

[0019] The present invention provides a porous medium burner in which air and fuel gas enter a mixer and mix to form a mixed gas, which flows sequentially through a flame arrester, a gas distributor, a first chamber, an air distribution plate, a second chamber, a small-pore porous medium and a large-pore porous medium, and finally burns inside and on the surface of the large-pore porous medium.

[0020] Air and fuel gas are mixed evenly inside the porous media burner and the mixture is evenly distributed to the air distribution plate by the gas distributor. Then, the evenly distributed mixture is evenly distributed onto the porous media by the air distribution plate, which makes the surface temperature of the porous media uniform during combustion and reduces the internal temperature difference of the porous media. This can effectively increase the service life of the porous media burner and improve the heating quality of the workpiece.

[0021] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0022] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein:

[0023] Figure 1 A schematic diagram of the first structure of a porous media burner;

[0024] Figure 2 This is a schematic diagram of the first structure of the gas distributor in this invention;

[0025] Figure 3 This is a schematic diagram of the second structure of the gas distributor in this invention;

[0026] Figure 4 This is a schematic diagram of the second structure of a porous media burner;

[0027] Figure 5 This is a schematic diagram of the third structure of a porous media burner.

[0028] Reference numerals: 1-Mixer, 2-Flame arrester, 3-Gas distributor, 4-Shell, 5-Air distribution plate, 6-First porous medium, 7-Second porous medium, 8-First chamber, 9-Second chamber, 10-Guide plate, 31-Gas distributor sidewall, 32-Upstream nozzle on sidewall, 33-Midstream nozzle on sidewall, 34-Downstream nozzle on sidewall, 35-Bottom surface of gas distributor, 36-Bottom surface nozzle. Detailed Implementation

[0029] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0030] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the invention. To better illustrate the embodiments of the invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0031] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0032] Please see Figures 1-5 A porous medium burner includes a mixer 1, a flame arrester 2, a gas distributor 3, a housing 4, and an air distribution plate 5, a first porous medium 6, and a second porous medium 7 (the pore size of the first porous medium is smaller than that of the second porous medium) within the housing 4, and the air distribution plate 5 is a porous plate structure.

[0033] The mixer 1 is provided with an air inlet and a gas inlet. Air and gas enter the mixer 1 through the air inlet and the gas inlet respectively to mix and form a mixed gas. The mixer 1 is connected to the flame arrester 2, and the flame arrester 2 is connected to the gas distributor 3, so that the mixed gas passes through the mixer 1, the flame arrester 2 and the gas distributor 3 in sequence.

[0034] The gas distributor 3 is fixed on the housing 4, and the housing 4 and the air distribution plate 5 arranged therein form a first chamber 8. One end of the gas distributor 3 is connected to the flame arrester 2, and the other end extends into the first chamber 8. The gas distributor 3 includes a gas distributor side wall 31 and a gas distributor bottom surface 35. The side wall 31 is partially located in the first chamber 8, and the bottom surface 35 is completely located in the first chamber 8. The gas distributor 3 has nozzles (upstream nozzle 32, midstream nozzle 33, downstream nozzle 34, and bottom nozzle 36) on the side wall 31 and bottom surface 35 located in the first chamber 8. The gas distributor 3 is connected to the first chamber 8 through the nozzles on the side wall 31 and bottom surface 35, and the mixed gas enters the first chamber 8 through the nozzles.

[0035] Key references Figure 2 and attached Figure 3 The gas distributor sidewall 31 is provided with two or more layers of nozzles, each layer is provided with multiple nozzles, and the center line of each layer of nozzles has an angle with the center line of the gas distributor 3. Along the direction of mixed gas flow, the angle between the center line of each layer of nozzles and the center line of the gas distributor 3 gradually decreases.

[0036] Specifically, the multi-layer nozzle includes an upstream nozzle 32 on the sidewall, a midstream nozzle 33 on the sidewall, and a downstream nozzle 34 on the sidewall.

[0037] When the gas distributor sidewall 31 is provided with three layers of nozzles, as shown in the attached... Figure 2 The angle A between the centerline of the upstream nozzle 32 on the side wall and the centerline of the gas distributor 3 is 60° to 80°; the angle B between the centerline of the midstream nozzle 33 on the side wall and the centerline of the gas distributor 3 is 40° to 60°; and the angle C between the centerline of the downstream nozzle 34 on the side wall and the centerline of the gas distributor 3 is 20° to 40°.

[0038] When two layers of nozzles are provided on the side wall 31 of the gas distributor, as shown in the attached... Figure 3 The angle A' between the centerline of the upstream nozzle 32 on the side wall and the centerline of the gas distributor 3 is 50° to 80°, and the angle B' between the centerline of the downstream second-layer nozzle (i.e., the midstream nozzle 33 on the side wall) and the centerline of the gas distributor 3 is 10° to 40°.

[0039] The gas distributor has a plurality of bottom spray holes 36 on its bottom surface 35, and the angle D between the center line of the bottom spray hole 36 and the gas distributor 3 is 0° to 20°.

[0040] By setting multi-layered nozzles at different angles on the sidewall 31 and bottom surface 35 of the gas distributor 3, after the mixed gas is ejected from the gas distributor 3 and enters the first chamber 8, the mixed gas ejected from the upstream nozzle 32 of the sidewall 31 covers the outer area of ​​the first chamber 8, the mixed gas ejected from the mid-to-downstream nozzles (mid-stream nozzle 33 and downstream nozzle 34) of the sidewall 31 covers the middle area of ​​the first chamber 8, and the mixed gas ejected from the bottom nozzle 36 of the bottom surface 35 covers the central area of ​​the first chamber 8. Through the above technical means, the mixed gas is evenly distributed when it reaches the air distribution plate 5.

[0041] The air distribution plate 5 is located inside the housing 4 and fixed to the housing 4. The air distribution plate 5 and the housing 4 form a first chamber 8. The air distribution plate 5 and the first porous medium 6 (small pore porous medium) cooperate to form a second chamber 9 in the housing. The air distribution plate 5 has a porous structure with a porosity of >50%.

[0042] Optionally, the air distribution panel 5 can be a flat plate or trapezoidal plate structure, as shown in the attached... Figure 1 The air distribution panel 5 is a flat plate structure, with attached... Figure 4 The air distribution panel 5 is a trapezoidal panel structure.

[0043] Optionally, see appendix. Figure 5 The gas distributor 3 may be equipped with guide plates 10. The number of layers of guide plates 10 is equal to the number of layers of nozzles arranged on the side wall 31 of the gas distributor, and the angles (A, B, C, A', B') between each layer of guide plates 10 and the center line of the gas distributor and the center line of each layer of nozzles on the side wall of the gas distributor are equal. Each guide plate 10 is matched with a corresponding nozzle and arranged below the corresponding nozzle to guide the mixed gas ejected from the corresponding nozzle.

[0044] Specifically, the first porous medium 6 is connected to the second porous medium 7 (macroporous medium), that is, the second porous medium 7 is arranged on the side of the first porous medium 6 away from the second chamber 9.

[0045] The working process of this porous media burner is as follows:

[0046] Air and fuel gas enter the mixer 1 and mix to form a mixed gas, which flows sequentially through the flame arrester 2, gas distributor 3, first chamber 8, air distribution plate 5, second chamber 9, first porous medium 6, and second porous medium 7, and finally burns inside and on the surface of the second porous medium 7.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A porous media burner, characterized in that: The device includes a gas distributor, a housing, and a distribution plate arranged inside the housing. A first chamber is formed between the housing and the distribution plate arranged therein. The gas distributor is fixed to the housing and inserted into the first chamber, and the gas distributor is connected to the first chamber. The gas distributor has a bottom surface and a side wall, and spray holes are provided on both the bottom surface and the side wall of the gas distributor located in the first chamber. The spray holes on the side wall of the gas distributor are multi-layered to evenly distribute the gas in the gas distributor onto the air distribution plate. The nozzles include bottom nozzles arranged on the bottom surface of the gas distributor and multi-layer nozzles arranged on the side wall of the gas distributor. The angles formed by the centerlines of the bottom nozzles and the multi-layer nozzles with the centerline of the gas distributor are all less than 80°. The angles of each layer of nozzles in the multi-layer nozzles gradually decrease along the direction of gas flow. The gas distributor has multiple bottom spray holes on its bottom surface, and the angle D between the center line of the bottom spray holes and the center line of the gas distributor is 0°~20°. The gas distributor is also provided with a guide plate. The number of layers of the guide plate is equal to the number of spray holes on the side wall of the gas distributor. The guide plate is arranged on the side of the corresponding spray hole close to the air distribution plate. The angle formed by each layer of the guide plate and the center line of the gas distributor is equal to the angle formed by the center line of each layer of spray holes on the side wall of the gas distributor and the center line of the gas distributor.

2. The porous media burner according to claim 1, characterized in that: The multi-layer nozzle includes an upstream nozzle, a midstream nozzle, and a downstream nozzle on the sidewall. The angle A between the centerline of the upstream nozzle and the centerline of the gas distributor is 60°~80°, the angle B between the centerline of the midstream nozzle and the centerline of the gas distributor is 40°~60°, and the angle C between the centerline of the downstream nozzle and the centerline of the gas distributor is 20°~40°.

3. The porous media burner according to claim 1, characterized in that: The multi-layer nozzle includes an upstream nozzle and a midstream nozzle on the sidewall. The angle A' between the centerline of the upstream nozzle and the centerline of the gas distributor is 50°~80°, and the angle B' between the centerline of the midstream nozzle and the centerline of the gas distributor is 10°~40°.

4. The porous media burner according to claim 1, characterized in that: The air distribution plate has a porous plate structure with a porosity greater than 50%.

5. The porous media burner according to claim 1, characterized in that: The air distribution plate is a flat or trapezoidal plate structure.

6. The porous media burner according to claim 1, characterized in that: It also includes a mixer and a flame arrester, the mixer being connected to the flame arrester, the flame arrester being connected to the gas distributor, and the mixer being provided with an air inlet and a gas inlet for mixing gas and air in the mixer.

7. The porous media burner according to claim 1, characterized in that: It also includes a first porous medium and a second porous medium, wherein the pore size of the first porous medium is smaller than that of the second porous medium; the first porous medium and the second porous medium are arranged adjacent to each other and installed in the housing, and the first porous medium cooperates with the air distribution plate to form a second chamber in the housing.

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