Conical laminated low-nitrogen combustion head and low-nitrogen combustor

Abstract

The utility model discloses a conical laminated low-nitrogen combustion head which comprises a plurality of conical laminated annular combustion sheets, combustion holes distributed annularly are formed in the annular combustion sheets, and parts of orifices in the two ends of the combustion holes are shielded by the adjacent annular combustion sheets respectively. The projection of the shielded part on the same cross section of the combustion hole covers the cross section of the whole combustion hole, the annular combustion sheet on the upper layer shields the inner side part of an orifice of the combustion hole, and the annular combustion sheet on the lower layer shields the outer side part of the orifice of the combustion hole. The utility model further discloses a combustor adopting the conical laminated low-nitrogen combustion head. The burner is suitable for high-power low-nitrogen combustion, short in flame length and not prone to blockage.

Description

Technical Field

[0001] The invention relates to a burner structure, in particular to a conical laminated low-nitrogen combustion head and a low-nitrogen burner. Background Art

[0002] In order to solve the clogging problem of the burner head with a metal mesh structure, the publication number CN219510791U discloses a perforated plate type low-nitrogen burner head, which adopts a first long hole opened on the surface of the premixed gas flow cavity, and then a plug with a tongue is inserted into the first long hole on the surface of the flow cavity, and a second long hole is opened on the surface of the tongue to form vertical and horizontal gas paths to meet the requirements of surface low-nitrogen combustion. At the same time, the hot and cold deformation of the plug is used to generate friction with the premixed gas flow cavity to eliminate carbon deposits and reduce clogging.

[0003] However, the arrangement density of the inserts of the burner head with this structure is limited, and the tongues on each insert need to be arranged at intervals, so the density of the flame formed cannot be very high. When the power of the burner head needs to be increased, it is mainly achieved by increasing the surface area of ​​the premixed gas flow cavity, which makes the size of the burner head increase rapidly, and then it is necessary to consider the matching problem with the furnace. Summary of the invention

[0004] In view of the above-mentioned defects of the prior art, the task of the present invention is to provide a conical laminated low-nitrogen burner head, the purpose of which is to solve the problem that high-power low-nitrogen burners are large in size and prone to clogging. The task of the present invention is to provide a low-nitrogen burner with a small size and concentrated flame.

[0005] The technical solution of the present invention is as follows: a conical stacked low-nitrogen combustion head, comprising a plurality of stacked conical annular combustion plates, the annular combustion plates being provided with combustion holes distributed along a ring shape, a portion of the orifices at both ends of the combustion holes being respectively shielded by adjacent annular combustion plates, a projection of the shielded portions on the same cross section of the combustion holes covers the entire cross section of the combustion holes, the upper annular combustion plate shields the inner portion of the orifice of the combustion holes, and the lower annular combustion plate shields the outer portion of the orifice of the combustion holes.

[0006] Furthermore, the annular combustion sheet includes a straight flame gasket, the outer circumference of the straight flame gasket is not larger than the annular combustion sheet on the upper layer, the straight flame gasket is provided with a through hole overlapping the combustion hole of the annular combustion sheet on the upper layer, and the straight flame gasket is provided with a first guide groove opened from the outer circumference to the through hole. The added straight flame gaskets can be arranged at a certain distance on the entire cone to reduce problems such as separation and de-fire, and achieve the purpose of stabilizing the flame.

[0007] Furthermore, the annular combustion sheet is in the shape of a circular ring.

[0008] Furthermore, the radius of the circle where the center point of the combustion hole is located is equal to the outer diameter of the annular combustion plate of the upper layer, and the radius of the circle where the center point of the combustion hole is located is equal to the inner diameter of the annular combustion plate of the lower layer.

[0009] Furthermore, the first guide groove is opened along the radial direction of the straight flame gasket.

[0010] Furthermore, it includes a cylindrical section, which includes alternatingly stacked annular surface combustion plates and annular gaskets, the annular surface combustion plate is provided with surface combustion holes distributed along a ring shape and a second guide groove leading from the surface combustion holes to the outer periphery of the annular surface combustion plate, the annular gasket blocks the second guide groove and the side of the surface combustion hole close to the second guide groove at the end face of the annular surface combustion plate.

[0011] Furthermore, the cylindrical section is a cylindrical section, and the second guide groove is opened along the radial direction of the cross section of the cylinder.

[0012] Furthermore, the columnar segment is arranged at the head end, the middle part or the tail end of the cone formed by stacking the annular combustion sheets.

[0013] Furthermore, a connecting plate is provided in the middle of the annular combustion plate, the connecting plate is connected to the outer peripheral portion of the annular combustion plate through a plurality of spokes, and the connecting plate is passed through a central connecting rod.

[0014] Another technical solution of the present invention is as follows: a low-nitrogen burner, comprising the aforementioned conical stacked-plate low-nitrogen combustion head.

[0015] The advantages of the present invention compared with the prior art are:

[0016] The stacked annular combustion plates shield parts of the combustion holes from each other to form a tortuous gas channel, which effectively controls the flame length, reduces the residence time of the fuel in the high temperature zone, and thus reduces the amount of NOx generated. The distribution density of the combustion holes will not be as dense as the honeycomb mesh of the metal mesh, and the sheet structure of the annular combustion plates can also reduce the occurrence of blockage by utilizing the deformation of the annular combustion plates to generate mutual friction. Although the conical side area is smaller than the cylindrical side area, the distribution density of the gas channel actually formed by the stacked annular combustion plates shielding the combustion holes from each other is greater than the distribution density of the gas channel formed by the orifice plates in the prior art, so it is easier to achieve high-power combustion, and a cylindrical section can also be added to form surface combustion to adjust the combustion power of the burner head. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the structure of a low nitrogen burner according to an embodiment.

[0018] Figure 2It is a schematic diagram of the front-view structure of a conical stacked low-nitrogen burner head of an embodiment.

[0019] Figure 3 It is a schematic diagram of the rear view structure of the conical stacked low nitrogen burner head of the embodiment.

[0020] Figure 4 It is a schematic diagram of the lateral structure of a conical stacked-plate low-nitrogen burner head according to an embodiment.

[0021] Figure 5 It is a schematic structural diagram of the annular combustion plate of an embodiment.

[0022] Figure 6 It is a schematic diagram of the specific cross-sectional structure of the stacked annular combustion plates of an embodiment.

[0023] Figure 7 It is a schematic diagram of the position of the cylindrical segment of the embodiment.

[0024] Figure 8 It is a schematic structural diagram of the columnar segment of the embodiment.

[0025] Fig. 9 It is a schematic structural diagram of the annular surface combustion sheet of an embodiment.

[0026] Fig.10 Schematic diagram of the structure of the annular gasket of the embodiment.

[0027] Fig.11 It is a schematic structural diagram of the straight flame gasket of the embodiment. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the embodiments, but are not intended to limit the present invention.

[0029] Please combine Figure 1 As shown, a low nitrogen burner involved in this embodiment includes a gas-air mixing cylinder 100 and a conical laminated low nitrogen burner head 200 arranged at the front end thereof. The gas-air mixing cylinder 100 can use a mixing device in the prior art to make the gas and air (oxygen) evenly mixed in the gas-air mixing cylinder 100 and then burned through the conical laminated low nitrogen burner head 200. The gas-air mixing cylinder 100 can also be used as a conveying channel for the mixed gas, which only delivers the gas mixed with air to the conical laminated low nitrogen burner head 200.

[0030] Please combine Figures 2 to 4As shown, the conical laminated low-nitrogen burner head 200 of this embodiment is composed of a plurality of stacked annular combustion sheets 201 of different sizes. The annular combustion sheets 201 are stacked from small to large from top to bottom to form an approximately conical shape. The head end thereof can be provided with a flame probe 300 and an ignition head 400 to realize ignition and combustion condition detection. It should be pointed out that the shape of the annular combustion sheet 201 can be a circular ring, a square ring or even a triangular ring. It is easy to understand that the annular combustion sheet 201 in the form of a circular ring constitutes an approximately conical laminated low-nitrogen burner head, the annular combustion sheet 201 in the form of a square ring constitutes an approximately quadrangular pyramidal laminated low-nitrogen burner head, and the annular combustion sheet 201 in the form of a triangular ring constitutes an approximately triangular pyramidal laminated low-nitrogen burner head. The laminated low-nitrogen burner head composed of annular combustion sheets 201 in the form of a circular ring is further described below.

[0031] Please further combine Figure 5 , Figure 6 As shown, the annular combustion sheet 201 in the form of a ring is provided with combustion holes 2011 distributed along the ring shape. After being stacked up and down, a part of the upper and lower openings of the combustion holes 2011 on the annular combustion sheet 201 of the current layer are respectively shielded by the adjacent upper and lower annular combustion sheets 201, and the projection of the shielded part on the same cross section of the combustion hole 2011 covers the entire cross section of the combustion hole 2011. The upper annular combustion sheet 201 shields the inner part of the opening of the combustion hole 2011, and the lower annular combustion sheet 201 shields the outer part of the opening of the combustion hole 2011. In a specific implementation, the radius of the circle where the center point of the combustion hole 2011 is located is equal to the outer diameter of the annular combustion sheet 201 of the upper layer, and the radius of the circle where the center point of the combustion hole 2011 is located is equal to the inner diameter of the annular combustion sheet 201 of the lower layer. For example, a combustion hole 2011 is opened along the center line of the annular combustion sheet 201, and the diameter of the combustion hole 2011 is 1 / 3 of the annular width of the annular combustion sheet 201. The annular width of each layer of annular combustion sheet 201 and the diameter of the combustion hole 2011 are the same. In this way, the combustion holes 2011 on the annular combustion sheets 201 stacked up and down form a tortuous gas flow channel, which is distributed on a nearly conical surface, which can effectively control the flame length and reduce the generation of NOx.

[0032] In this embodiment, the connection and fixation of the annular combustion sheets 201 of each layer are carried out through a central connecting rod 202. Specifically, a connecting plate 2012 is provided in the middle of each annular combustion sheet 201. The connecting plate 2012 is connected to the annular portion of the annular combustion sheet 201 with the combustion hole 2011 provided on the periphery through three spokes 2013. A connecting hole 2014 is provided in the center of the connecting plate 2012. The connecting plate 2012 is penetrated on the central connecting rod 202. The central connecting rod 202 is provided with threads. Nuts 203 are respectively arranged on the central connecting rod 202 at the uppermost and lowermost positions of the annular combustion sheet 201 to press and fix all the annular combustion sheets 201 in sequence. Of course, the connecting hole 2014 of the connecting plate 2012 can also be processed into a threaded hole to directly screw the annular combustion sheets 201 of each layer onto the central connecting rod 202.

[0033] Please combine Figures 7 to 10 As shown, in order to match the required combustion power without infinitely increasing the diameter of the annular combustion sheet 201, a cylindrical section A is added in the preferred embodiment. What is added to the conical stacked low-nitrogen burner head is a cylindrical cylindrical section A. The cylindrical section A can be arranged at the head end, middle part or tail end of the cone formed by stacking the annular combustion sheets 201. The cylindrical section A includes annular surface combustion sheets 204 and annular gaskets 205 that are alternately stacked. The annular surface combustion sheets 204 and the annular gaskets 205 have the same size. When arranged at the head end of the cone, the size of the annular surface combustion sheet 204 is the same as the size of the annular combustion sheet 201 in the lower layer. When arranged in the middle part or tail end of the cone, the size of the annular surface combustion sheet 204 is the same as the size of the annular combustion sheet 201 in the upper layer. The annular surface combustion sheet 204 is provided with surface combustion holes 2041 distributed along an annular shape and second guide grooves 2042 that are connected from the surface combustion holes 2041 to the outer periphery of the annular surface combustion sheet 204. Preferably, the second guide grooves 2042 are opened along the radial direction of the annular surface combustion sheet 204, that is, the radial direction of the cross section of the cylindrical columnar section A. After being connected with the annular combustion sheet 201, the position of the surface combustion hole 2041 corresponds to the position of the combustion hole 2011 on the annular combustion sheet 201, and the annular gasket 205 is not provided with the combustion hole 2011. The annular gasket 205 blocks the second guide grooves 2042 and the side of the surface combustion hole 2041 close to the second guide grooves 2042 on the end surface of the annular surface combustion sheet 204. In this way, the premixed gas forms surface combustion on the surface of the columnar section A.

[0034] In some embodiments, please combine Fig.11As shown, a straight flame gasket 206 can be arranged between adjacent annular combustion sheets 201 to stabilize the flame. The structure of the straight flame gasket 206 is the same as that of the annular surface combustion sheet 204, and its size is the same as that of the upper annular combustion sheet 201. The straight flame gasket 206 is provided with a through hole 2061 overlapping with the combustion hole 2011 of the upper annular combustion sheet 201. The straight flame gasket 206 is provided with a first guide groove 2062 opened from the outer circumference to the through hole 2061. The straight flame gasket 206 is also annular. Preferably, the first guide groove 2062 is opened along the radial direction of the straight flame gasket 206. Therefore, the straight flame gasket 206 can also be regarded as a columnar segment A with only one layer of structure.

Claims

1. A conical laminated low nitrogen burner head, characterized in that: It comprises a plurality of stacked conical annular combustion sheets, each of which is provided with combustion holes distributed along a ring shape, a portion of the openings at both ends of the combustion holes being respectively shielded by adjacent annular combustion sheets, a projection of the shielded portions on the same cross section of the combustion holes covers the entire cross section of the combustion holes, the upper annular combustion sheet shields the inner portion of the openings of the combustion holes, and the lower annular combustion sheet shields the outer portion of the openings of the combustion holes.

2. The conical laminated low nitrogen burner head according to claim 1, characterized in that: The annular combustion plate includes a straight flame gasket, the outer circumference of the straight flame gasket is not larger than the annular combustion plate of the upper layer, the straight flame gasket is provided with a through hole overlapping the combustion hole of the annular combustion plate of the upper layer, and the straight flame gasket is provided with a first guide groove opened from the outer circumference to the through hole.

3. The conical laminated low nitrogen burner head according to claim 1 or 2, characterized in that: The annular combustion sheet is in the shape of a circular ring.

4. The conical laminated low nitrogen burner head according to claim 3, characterized in that: The radius of the circle where the center point of the combustion hole is located is equal to the outer diameter of the annular combustion plate of the upper layer, and the radius of the circle where the center point of the combustion hole is located is equal to the inner diameter of the annular combustion plate of the lower layer.

5. The conical laminated low nitrogen burner head according to claim 2, characterized in that: The annular combustion plate is in a circular ring shape, and the first guide groove is opened along the radial direction of the straight flame gasket.

6. The conical laminated low nitrogen burner head according to claim 1, characterized in that: It comprises a cylindrical section, which comprises alternatingly stacked annular surface combustion plates and annular gaskets, the annular surface combustion plates are provided with surface combustion holes distributed along an annular shape and second guide grooves connecting from the surface combustion holes to the periphery of the annular surface combustion plates, the annular gasket blocks the second guide groove and the side of the surface combustion hole close to the second guide groove at the end face of the annular surface combustion plate.

7. The conical laminated low nitrogen burner head according to claim 6, characterized in that: The cylindrical section is a cylindrical section, and the second guide groove is arranged along the radial direction of the cross section of the cylinder.

8. The conical laminated low nitrogen burner head according to claim 6, characterized in that: The columnar section is arranged at the head end, the middle part or the tail end of the cone formed by stacking the annular combustion sheets.

9. The conical laminated low nitrogen burner head according to claim 1, characterized in that: A connecting plate is arranged in the middle of the annular combustion plate, and the connecting plate is connected to the outer peripheral part of the annular combustion plate through a plurality of spokes, and the connecting plate is passed through the central connecting rod.

10. A low nitrogen burner, characterized in that: It comprises the conical laminated low nitrogen burner head as described in any one of claims 1, 2, 5, 6, 7, 8 and 9.

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