Combustor gas mixing structure and wall-hanging stove
By adjusting the nozzle and fire discharge plate structure in the burner and optimizing the mixing of gas and air, the NOx emission problem of existing burners is solved, achieving more full combustion and lower NOx emissions.
Patent Information
- Application Number
- CN202323294232.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-04
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2033-12-04
AI Technical Summary
Existing burners emit a large amount of NOx gas during use, which affects the environment and health. The unbalanced gas supply and air content affects the combustion effect, making it difficult to control NOx emissions.
A combustor gas mixing structure is designed. By adjusting the size, distance and nozzle size of the nozzle and the fire vent, the mixing ratio of gas and air is adjusted, and the gas separation structure and multiple nozzle distribution are adopted to ensure the full mixing of gas and air. Reduce NOx emissions.
By optimizing the mixing of gas and air, the NOx emissions are significantly reduced, environmental protection requirements are met, and combustion efficiency is improved.
Smart Images
Figure CN222256521U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of burners, and in particular relates to a burner gas mixing structure and a wall-mounted boiler. Background Art
[0002] Most of the burners on the market now usually emit NOx gas (nitrogen oxides) during use. Since the NO in NOx gas is very toxic, it can easily combine with hemoglobin Hb in the blood, causing blood hypoxia and central nervous system paralysis. The affinity of NO for hemoglobin is about hundreds to thousands of times that of CO. NOx is also the main pollutant that directly or indirectly causes atmospheric environmental pollution.
[0003] In existing burners, due to the gas supply and subsequent air replenishment process, the gas content in the mixed gas is too high, or the air content is too high, which will affect the combustion effect; therefore, the size of the gas supply nozzle, the distance between the nozzle and the fire row, and other data will affect the final NOx emissions. Therefore, in order to meet the basic requirements of environmental protection, how to reduce the generation and emission of NOx in existing burners is a problem that needs to be solved at present. Utility Model Content
[0004] The first object of the utility model is to provide a burner gas mixing structure to solve the problem of NOx emission during the combustion process of the existing burner. The second object of the utility model is to provide a wall-mounted boiler.
[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0006] As a first aspect of the present invention, a burner gas mixing structure comprises:
[0007] A burner, the burner comprising a plurality of fire row pieces arranged side by side and parallel to a longitudinal plane, the fire row piece comprising a fire row piece body, a first gas channel being arranged in the fire row piece body, the first gas channel comprising a contraction section, an air intake section, a pressure expansion section and a flame mouth which are connected in sequence, the flame mouth being located at the top of the fire row piece body, the contraction section serving as a gas inlet, and the flame mouth serving as a gas outlet;
[0008] A gas distribution structure, wherein the gas distribution structure is detachably connected to the contraction section of the burner, and the gas distribution structure comprises a gas distribution rod, wherein a second gas channel is provided in the gas distribution rod, and a plurality of nozzles are provided at intervals on the gas distribution rod along the axial direction of the second gas channel, wherein the nozzles are connected to the second gas channel, and an air inlet connected to the second gas channel is provided on the gas distribution rod;
[0009] The contraction sections of the plurality of fire row plate bodies correspond one by one to the nozzles on the gas distribution rod;
[0010] The distance from each nozzle on the gas distribution rod to the fire row of the burner is L, and the nozzles on the gas distribution rod are distributed at intervals, and this interval distance is P. The ratio of the distance from each nozzle to the fire row of the burner to the interval between two adjacent nozzles is L / P, denoted as A, where 0.3≤A≤0.5.
[0011] Optionally, the area of the nozzle of a single nozzle is S P The product of the ratio of the distance from each nozzle to the fire row of the burner to the interval between two adjacent nozzles and the area of the nozzle of a single nozzle is B, where 0.2<B<0.5.
[0012] Optionally, the total area of the nozzle opening of the nozzle is S1; the gas enters the corresponding contraction section from each nozzle through the front gas through hole, and the area of the front gas through hole is S q The total area of all the front gas through holes is S2, and the ratio of the total area of the nozzle openings of the nozzle to the total area of the front gas through holes is C, where C is less than 0.3.
[0013] Optionally, the total area of the nozzle of the nozzle is S1; the gas needs to pass through the front gas through hole when entering the contraction section from the nozzle, and the area of the front gas through hole is S q The total area of the front gas through holes is S2, and the ratio of the total area of the nozzle openings of the nozzle to the total area of the front gas through holes is C, wherein C is less than 0.3.
[0014] Optionally, a front positioning portion is provided on the front fixing frame, and a front connecting portion connected to the front positioning portion is provided on the fire row piece, and a first airfoil connecting portion is formed between two adjacent front positioning portions, and a single first airfoil connecting portion has an airfoil projection area on its corresponding front air through hole, and the part of the front air through hole excluding the airfoil projection area is the front air entry area, and the front air is the primary air supply when the gas enters the burner, and the total front air entry area is S3, and the total area of the flame mouth of the fire row piece is S4, wherein the ratio of the total area of the flame mouth of the fire row piece to the total front air entry area is D, and 0.2≤D≤0.4.
[0015] Optionally, the total plane area at the flame mouth of the fire row piece is S5, wherein the ratio of the total plane area at the flame mouth of the fire row piece to the total front air entry area is E, 0.3≤E≤0.7.
[0016] Optionally, a rear positioning portion is provided on the rear fixing frame, a rear connecting portion connected to the rear positioning portion is provided on the fire row piece, and a second wing-shaped connecting portion is formed between two adjacent rear positioning portions.
[0017] Optionally, the two ends of the gas distribution rod are detachably connected with a first connecting member and a second connecting member, the structure of the second connecting member is symmetrical to the structure of the first connecting member, and the gas distribution rod is detachably connected to the burner through the first connecting member and the second connecting member.
[0018] As a second aspect of the present invention, a wall-mounted boiler includes the burner gas mixing structure.
[0019] The beneficial effects of the utility model are:
[0020] The utility model adjusts the gas content and air content of the burner by adjusting the size of the nozzle and the fire row piece, the distance between the nozzle, the nozzle orifice size and other positions, so as to make the combustion more complete and reduce the emission of NOx. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 This is the first stereoscopic structural diagram of the burner mixing structure of the utility model.
[0022] Figure 2 This is a second three-dimensional structural diagram of the burner mixing structure of the utility model.
[0023] Figure 3 It is a front view structural diagram of the burner mixing structure of the utility model.
[0024] Figure 4 It is a side structural diagram of the burner mixing structure of the utility model.
[0025] Figure 5 It is the rear structure diagram of the burner mixing structure of the utility model.
[0026] Figure 6 It is a three-dimensional structural diagram of the front fixing frame of the burner mixing structure of the utility model.
[0027] Figure 7 This is a front structural diagram of the front fixing frame of the burner mixing structure of the utility model.
[0028] In the figure: 1. burner; 11. fire row plate; 111. contraction section; 112. air intake section; 113. expansion section; 114. flame mouth; 12. front fixing frame; 121. front gas through hole; 122. first airfoil connection; 123. front air through hole; 13. rear fixing frame; 131. rear air through hole; 132. second airfoil connection; 2. gas distribution structure; 21. first connecting piece; 22. gas distribution rod; 23. air intake; 24. second connecting piece; 25. nozzle. DETAILED DESCRIPTION
[0029] The present invention will be further described in detail below in conjunction with the accompanying drawings.
[0030] like Figure 1 - Figure 7 As shown, the utility model discloses a wall-mounted boiler, including a burner gas mixing structure, the burner gas mixing structure includes:
[0031] A burner 1, wherein the burner 1 comprises a plurality of fire row pieces 11 arranged side by side and parallel to a longitudinal plane, wherein the fire row piece 11 comprises a fire row piece body, wherein a first gas channel is arranged in the fire row piece body, wherein the first gas channel comprises a contraction section 111, an air inlet section 112, a pressure expansion section 113 and a flame mouth 114 which are connected in sequence, wherein the flame mouth 114 is located at the top of the fire row piece body, wherein the contraction section 111 serves as a gas inlet, and the flame mouth 114 serves as a gas outlet;
[0032] A gas distribution structure 2, the gas distribution structure 2 is detachably connected to the contraction section 111 of the burner 1, the gas distribution structure 2 includes a gas distribution rod 22, a second gas channel is provided in the gas distribution rod 22, a plurality of nozzles 25 are provided at intervals on the gas distribution rod 22 along the axial direction of the second gas channel, the nozzles 25 are connected to the second gas channel, and an air inlet 23 connected to the second gas channel is provided on the gas distribution rod 22;
[0033] The contraction sections 111 of the plurality of fire strip bodies correspond one by one to the nozzles 25 on the gas distribution rods 22 .
[0034] like Figure 1 and Figure 3 As shown, it should be noted that, in this embodiment, the gas separation structure 2 is detachably connected to the contraction section 111 of the burner 1, and the implementation method of the detachable connection includes but is not limited to the following structures:
[0035] The two ends of the gas distribution rod 22 are detachably connected with a first connection member 21 and a second connection member 24, respectively. The structure of the second connection member 24 is symmetrical with that of the first connection member 21. The gas distribution rod 22 is connected to the burner 1 by bolts through the first connection member 21 and the second connection member 24. The detachable first connection member 21 and the second connection member 24 facilitate the disassembly and installation of the gas distribution rod 22, and the cleaning and maintenance of the structure can be facilitated.
[0036] like Figure 1 and Figure 3As shown, it should be noted that, in the present embodiment, the distance from each nozzle 25 on the gas distribution rod 22 to the fire row piece 11 of the burner 1 is L, and the nozzles 25 on the gas distribution rod 22 are distributed at intervals, and this interval distance is P. The ratio of the distance from each nozzle 25 to the fire row piece 11 of the burner 1 to the interval between two adjacent nozzles 25 is L / P, denoted as A, wherein 0.3≤A≤0.5; as an example, in the present embodiment, L is 4.8 mm, and P is 12.4 mm, wherein A≈0.387, at which time the amount of gas and air entering is better.
[0037] Furthermore, in this embodiment, the area of the nozzle of a single nozzle 25 is S P， The product of the ratio of the distance between each nozzle 25 and the fire row 11 of the burner 1 to the interval between two adjacent nozzles 25 and the area of the nozzle of a single nozzle 25 is B, where 0.2<B<0.5; as an example, S P =3.14*(1.03 / 2)2≈0.833, B=0.387*0.833≈0.322, at this time the intake amount of gas and air is better.
[0038] like Figure 1 , Figure 2 , Figure 6 and Figure 7 As shown, it should be noted that, in this embodiment, the burner 1 is further provided with a front fixing frame 12 and a rear fixing frame 13, and the front fixing frame 12 and the rear fixing frame 13 are respectively connected to the front and rear sides of the fire row piece 11, and the front fixing frame 12 is provided with a front gas through hole 121 that is communicated with the contraction section 111 and corresponds to the contraction section 111 one by one; the front fixing frame 12 is provided with a plurality of front air through holes 123; and the rear fixing frame 13 is provided with a plurality of rear air through holes 131.
[0039] like Figure 1 and Figure 7 As shown, further, in this embodiment, the total area of the nozzle of the nozzle 25 is S1; the gas enters the corresponding contraction section 111 from each nozzle 25 and passes through the front gas through hole 121, and the area of the front gas through hole 121 is S q , the total area of all the front gas through holes 121 is S2, the ratio of the total area of the nozzles 25 to the total area of the front gas through holes 121 is C, where C<0.3;
[0040] As an example, S1≈S P *22=18.32mm 2 , S q ≈73.48mm 2 , S2≈S q *22=1616.56mm 2, C≈0.011mm 2 At this time, the amount of gas and air entering is better.
[0041] like Figure 5 , Figure 6 and Figure 7 As shown, further, in this embodiment, the front fixing frame 12 is provided with a front positioning portion, the fire row sheet 11 is provided with a front connecting portion connected to the front positioning portion, and a first airfoil connecting portion 122 is formed between two adjacent front positioning portions. A single first airfoil connecting portion 122 has an airfoil projection area on its corresponding front air through hole 123, and the portion of the front air through hole 123 excluding the airfoil projection area is the front air inlet area ( Figure 7 The front air is the primary air supply when the gas enters the burner 1, the total area of the front air entering is S3, the total area of the flame mouth 114 of the fire row piece 11 is S4, wherein the ratio of the total area of the flame mouth 114 of the fire row piece 11 to the total area of the front air entering is D, 0.2≤D≤0.4;
[0042] As an example, the total front air intake area S3 (137.79-46.74)*21=1912.05 mm 2 The total area of the flame mouth 114 of the fire row piece 11 includes large holes and small holes, of which there are 168 large holes and 32 small holes, S4 = 168 * 1.875 + 32 * 3 = 411mm 2 , D = 0.215, at this time the amount of gas and air entering is better.
[0043] like Figure 5 As shown, further, in this embodiment, the total plane area of the flame mouth 114 of the fire row piece 11 is S5, wherein the ratio of the surface area of the flame mouth 114 of the fire row piece 11 to the total front air inlet area is E, 0.3≤E≤0.7;
[0044] As an example, S5 = 143.8733 * 9.2 = 1323.63 mm 2 , E=0.692, at this time the intake amount of gas and air is better.
[0045] like Figure 5As shown, further, in the present embodiment, the rear fixing frame 13 is provided with a rear positioning portion, the fire row piece 11 is provided with a rear connecting portion connected to the rear positioning portion, and a second wing-shaped connecting portion 132 is formed between two adjacent rear positioning portions; a plurality of fire row pieces 11 are sequentially buckled on the rear fixing frame 13 through an integrally formed block, and the fire row pieces 11 are limited and fixed by the second wing-shaped connecting portion 132 of the rear fixing portion, the front fixing frame 12 is fixed to the top end of the fire row piece 11, and the fire row piece 11 is limited and fixed again by the first wing-shaped connecting portion 122 of the front fixing frame 12; the gaps between the fire row pieces 11 can allow smooth circulation so that air can be replenished during the operation of the burner 1.
[0046] It should be noted that the gas distribution rod 22 is connected to the gas through the air inlet 23, and the gas passes through the second gas channel in the gas distribution rod 22 and is input to the contraction section 111 of the fire row piece 11 through the nozzle 25. Since there is a certain distance between the nozzle 25 and the fire row piece 11, when the gas is ejected through the nozzle 25 and input to the contraction section 111, the air flow will drive the air passing through the front air through hole 123 to enter the contraction section 111 of the fire row piece 11. This process is also a gas replenishment when the gas enters the burner 1.
[0047] The incoming air is mixed with the gas in the fire row piece 11 and transported to the flame mouth 114 of the fire row piece 11 through the first gas channel. During the combustion process of the burner 1, due to flame combustion and air flow, the air passes through the rear air hole 131 and is replenished with gas for the second time at the flame mouth 114.
[0048] The following are the experimental data obtained when the positions of A, B, C, D and E are adjusted and other conditions are the same:
[0049]
[0050] The following is the experimental data obtained when the prior art is adjusted at positions A, B, C, D and E, with other conditions being the same:
[0051]
[0052]
[0053] It should be noted that the above experiments are all carried out in accordance with GB 25034, which stipulates that the sum of the NOx content in each place is preferably less than 100PPM; by comparison, it is known that the total content of NOx and CO generated by the burner of the present application is lower than the total content of NOx and CO generated by the burner of the prior art, therefore, the burner of the present application has greater advantages.
[0054] The present application adjusts the gas content and air content of the burner by adjusting the size of the nozzle 25 and the fire row piece 11, the distance between the nozzle 25, the nozzle size of the nozzle 25 and other positions, so as to make the combustion more complete and reduce the emission of NOx.
[0055] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.
[0056] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values of the parts and steps set forth in these embodiments do not limit the scope of the present application. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.
[0057] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.
[0058] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.
[0059] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.
[0060] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0061] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made according to the scope of the patent application of the present invention should fall within the scope of the present invention.
Claims
1. A burner gas mixing structure, characterized in that: include: A burner, the burner comprising a plurality of fire row pieces arranged side by side and parallel to a longitudinal plane, the fire row piece comprising a fire row piece body, a first gas channel being arranged in the fire row piece body, the first gas channel comprising a contraction section, an air intake section, a pressure expansion section and a flame mouth which are connected in sequence, the flame mouth being located at the top of the fire row piece body, the contraction section serving as a gas inlet, and the flame mouth serving as a gas outlet; A gas distribution structure, wherein the gas distribution structure is detachably connected to the contraction section of the burner, and the gas distribution structure comprises a gas distribution rod, wherein a second gas channel is provided in the gas distribution rod, and a plurality of nozzles are provided at intervals on the gas distribution rod along the axial direction of the second gas channel, wherein the nozzles are connected to the second gas channel, and an air inlet connected to the second gas channel is provided on the gas distribution rod; The contraction sections of the plurality of fire row plate bodies correspond one by one to the nozzles on the gas distribution rod; The distance from each nozzle on the gas distribution rod to the fire row of the burner is L, and the nozzles on the gas distribution rod are distributed at intervals, and this interval distance is P. The ratio of the distance from each nozzle to the fire row of the burner to the interval between two adjacent nozzles is L / P, denoted as A, where 0.3≤A≤0.
5.
2. The burner gas mixing structure according to claim 1, characterized in that: The area of the nozzle of a single nozzle is S P The product of the ratio of the distance from each nozzle to the fire row of the burner to the interval between two adjacent nozzles and the area of the nozzle of a single nozzle is B, where 0.2<B<0.
5.
3. The burner gas mixing structure according to claim 1, characterized in that: The burner is also provided with a front fixing frame and a rear fixing frame, which are respectively connected to the front and rear sides of the fire row piece. The front fixing frame is provided with a front gas through hole which is communicated with the contraction section and corresponds to the contraction section one by one; the front fixing frame is provided with a plurality of front air through holes; and the rear fixing frame is provided with a plurality of rear air through holes.
4. The burner gas mixing structure according to claim 3, characterized in that: The total area of the nozzle is S1; the gas enters the corresponding contraction section from each nozzle and passes through the front gas through hole, the area of the front gas through hole is S q The total area of all the front gas through holes is S2, and the ratio of the total area of the nozzle openings of the nozzle to the total area of the front gas through holes is C, where C is less than 0.
3.
5. The burner gas mixing structure according to claim 3, characterized in that: The front fixing frame is provided with a front positioning portion, the fire row piece is provided with a front connecting portion connected to the front positioning portion, a first airfoil connecting portion is formed between two adjacent front positioning portions, a single first airfoil connecting portion has an airfoil projection area on its corresponding front air through hole, the part of the front air through hole excluding the airfoil projection area is the front air entrance area, the total front air entrance area is S3, the total area of the flame mouth of the fire row piece is S4, wherein the ratio of the total area of the flame mouth of the fire row piece to the total front air entrance area is D, 0.2≤D≤0.
4.
6. The burner gas mixing structure according to claim 5, characterized in that: The total plane area at the flame mouth of the fire row piece is S5, wherein the ratio of the total plane area at the flame mouth of the fire row piece to the total front air inlet area is E, 0.3≤E≤0.
7.
7. The burner gas mixing structure according to claim 4, characterized in that: The rear fixing frame is provided with a rear positioning portion, the fire row piece is provided with a rear connecting portion connected to the rear positioning portion, and a second wing-shaped connecting portion is formed between two adjacent rear positioning portions.
8. The burner gas mixing structure according to claim 1, characterized in that: The two ends of the gas distribution rod are detachably connected with a first connecting piece and a second connecting piece, respectively. The structure of the second connecting piece is symmetrical to that of the first connecting piece. The gas distribution rod is detachably connected to the burner through the first connecting piece and the second connecting piece.
9. A wall-mounted boiler, characterized in that: It comprises a burner mixing structure as claimed in any one of claims 1 to 8.