Regenerative burner with low nitrogen oxide content

Abstract

The utility model belongs to the technical field of heating furnace combustion, and discloses a low nitrogen oxide heat storage burner which comprises an air heat storage box and a coal gas heat storage box, the output end of the air heat storage box is provided with two groups of first spray heads, the output end of the coal gas heat storage box is provided with a group of second spray heads, and the first spray heads and the second spray heads are oppositely arranged; and the included angle between one group of first nozzles and the correspondingly mounted second nozzles is 46 degrees, and the included angle between the other adjacent group of first nozzles and the correspondingly mounted second nozzles is 62 degrees. By adopting the structural design, the plurality of first nozzles and the plurality of second nozzles of the single heat storage box adopt different spraying angles, so that the heat storage efficiency is improved; the spraying angles of the air heat storage box and the coal gas heat storage box are correspondingly configured, so that the mixing positions of air and coal gas are staggered, combustion is dispersed and not concentrated, local high temperature is not formed, the generation condition of nitric oxide (NOx) is not damaged, and the purpose of reducing the generation of the nitric oxide (NOx) is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of heating furnace combustion, and in particular relates to a low nitrogen oxide heat storage burner. Background Art

[0002] There are three main types of NOx products generated by fuel combustion: (1) fuel type, which is generated by the oxidation of nitrogen and compounds in the fuel during combustion, and the generation temperature is generally 600-800°C; (2) rapid type, which is generated by the high-temperature decomposition of hydrocarbons in the fuel volatiles and the reaction of CH free radicals with nitrogen and oxygen in the air; (3) thermal type, which is generated by the oxidation of nitrogen in the combustion air at high temperatures. The amount generated is very small below 1350°C, and its production increases exponentially with increasing temperature.

[0003] However, the current heating furnaces generally use the same angle of the heat storage box nozzle, which leads to the concentration of combustion points, and then causes local high temperatures. The longer the local high temperature lasts, the greater the amount of nitrogen oxides generated, so it is not conducive to environmental emissions. Utility Model Content

[0004] In response to the problems raised by the above background technology, the purpose of this utility model is to provide a low nitrogen oxide regenerative burner. To achieve the above technical objectives, the technical solutions adopted by this utility model are as follows:

[0005] A low nitrogen oxide regenerative burner, comprising an air regenerative tank and a gas regenerative tank, wherein the output end of the air regenerative tank is provided with two sets of first nozzles, and the output end of the gas regenerative tank is provided with a set of second nozzles, wherein the first nozzles and the second nozzles are provided opposite to each other;

[0006] The included angle between one group of the first nozzles and the corresponding second nozzles is 46°, and the included angle between another adjacent group of the first nozzles and the corresponding second nozzles is 62°.

[0007] It is further defined that the first nozzle and the second nozzle are integrally cast and formed with the furnace wall using a mold. Such a design facilitates the later maintenance of the furnace wall.

[0008] It is further defined that the nozzle ends of the installation positions of the first nozzle and the second nozzle are both in the same plane with the furnace wall, and the connection positions with the rear heat storage tank both adopt a "concave-convex" sealing structure. This design prevents leakage.

[0009] It is further defined that each group of the first nozzles has a different angle with the corresponding second nozzle. With this design, the combustion points at multiple positions can be changed at multiple angles, thereby ensuring that there is no problem of local high temperature.

[0010] It is further defined that the nozzle size of each group of the first nozzle and the corresponding second nozzle is different due to the different angles between the two. With this design, since the change in angle causes the position of the combustion point to change, the change in nozzle size can change the flow rate. The smaller the nozzle size, the faster the nozzle speed, ensuring that combustion can be achieved at a distant combustion point without changing the pressure.

[0011] The beneficial effects of adopting the utility model are:

[0012] With the structural design of the present invention, the multiple first nozzles and second nozzles of a single heat storage box adopt different spray angles, and the spray angles of the air heat storage box and the gas heat storage box are configured accordingly, so that the mixing positions of air and gas are staggered, making the combustion dispersed and unconcentrated, and preventing the formation of local high temperatures, thereby destroying the conditions for the formation of nitrogen oxides (NOx) and achieving the goal of reducing the formation of nitrogen oxides (NOx). BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention can be further described by way of non-limiting examples given in the accompanying drawings;

[0014] Figure 1 This is a structural schematic diagram of an embodiment of a low nitrogen oxide regenerative burner of the utility model;

[0015] Figure 2 for Figure 1 Schematic diagram of the cross-section structure at AA in the middle;

[0016] Figure 3 for Figure 1 Schematic diagram of the cross-section structure at the middle BB;

[0017] The main component symbols are described as follows:

[0018] Air heat storage tank 1; gas heat storage tank 2; first nozzle 3; second nozzle 4. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the present invention, the technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments.

[0020] Example 1:

[0021] like Figure 1 As shown, a low nitrogen oxide regenerative burner of the present invention comprises an air regenerative tank 1 and a gas regenerative tank 2. Two sets of first nozzles 3 are installed at the output end of the air regenerative tank 1, and a set of second nozzles 4 are installed at the output end of the gas regenerative tank 2. The first nozzles 3 and the second nozzles 4 are installed opposite to each other.

[0022] The included angle between one group of first nozzles 3 and the corresponding second nozzles 4 is 46°, and the included angle between another adjacent group of first nozzles 3 and the corresponding second nozzles 4 is 62°.

[0023] In this embodiment, when a low-nitrogen oxide regenerative burner is used, air is ejected from two first nozzles 3 and gas is ejected from two second nozzles 4. The intersection point of the two is the combustion point. Since the angles of each group of first nozzles 3 and the corresponding second nozzles 4 are different, the corresponding intersection point, that is, the combustion point, also changes in position. Since the position of the combustion point changes and is different, the combustion is dispersed and not concentrated, and local high temperature will not be formed, thereby destroying the conditions for the generation of nitrogen oxides NOx and achieving the goal of reducing the generation of nitrogen oxides NOx.

[0024] Example 2:

[0025] like Figures 2 and 3 As shown, in this embodiment, the first nozzle 3 and the second nozzle 4 are integrally cast with the furnace wall using a mold. This design is convenient for later maintenance of the furnace wall. However, the nozzle is prone to cracking and collapse in a long-term hot and cold alternating use environment, which is not conducive to separate maintenance. Prefabricated nozzle bricks can also be used and directly embedded in the furnace wall. Later replacement is convenient, but the cost is high and the furnace wall construction is difficult.

[0026] Example 3:

[0027] like Figures 2 and 3 As shown, in this embodiment, the ends of the nozzles of the installation positions of the first nozzle 3 and the second nozzle 4 are both in the same plane as the furnace wall, and the connection positions with the rear heat storage tank both adopt a "concave-convex" sealing structure. This design prevents leakage, especially the gas heat storage tank that may cause fire.

[0028] Example 4:

[0029] like Figures 2 and 3 As shown, in this embodiment, the angles between each group of first nozzles 3 and the corresponding second nozzles 4 are different. With this design, multiple angles can achieve changes in combustion points at multiple positions, thereby ensuring that there is no problem of local high temperature. The angles can be alternating designs of three degrees or completely different degrees of arrangement and combination, and the design can be considered according to specific circumstances.

[0030] Embodiment 5:

[0031] like Figures 2 and 3As shown, in this embodiment, the nozzle sizes of each group of first nozzles 3 and the correspondingly installed second nozzles 4 are different due to the different angles between the two. In this design, since the change in angle causes the combustion point position to change, the change in nozzle size can change the flow rate. The smaller the nozzle size, the faster the nozzle speed. Under the premise of not changing the pressure, combustion can be ensured at a distant combustion point position. The purpose is to achieve combustion at a distant combustion point position. Therefore, if you want to achieve combustion at different angles with the same nozzle size, you can connect a pressure valve separately to each group of first nozzles 3 and second nozzles 4, and change the gas flow rate by adjusting the pressure valve to achieve combustion at the ideal combustion point position.

[0032] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by persons skilled in the art without departing from the spirit and technical principles disclosed herein shall be covered by the claims of the present invention.

Claims

1. A low nitrogen oxide regenerative burner, comprising an air regenerative tank (1) and a gas regenerative tank (2), characterized in that: Two groups of first nozzles (3) are installed at the output end of the air heat storage tank (1), and one group of second nozzles (4) is installed at the output end of the gas heat storage tank (2), wherein the first nozzles (3) and the second nozzles (4) are installed relative to each other; The included angle between one group of the first nozzles (3) and the corresponding second nozzles (4) is 46°, and the included angle between another adjacent group of the first nozzles (3) and the corresponding second nozzles (4) is 62°.

2. The low nitrogen oxide regenerative burner according to claim 1, characterized in that: The first nozzle (3) and the second nozzle (4) are integrally cast and formed using a mold and a furnace wall.

3. The low nitrogen oxide regenerative burner according to claim 2, characterized in that: The nozzle ends of the first nozzle (3) and the second nozzle (4) are both in the same plane as the furnace wall, and the connection positions with the rear heat storage box both adopt a "concave-convex" sealing structure.

4. The low nitrogen oxide regenerative burner according to claim 3, characterized in that: The angles between each group of the first nozzles (3) and the correspondingly installed second nozzles (4) are different.

5. The low nitrogen oxide regenerative burner according to claim 4, characterized in that: The nozzle sizes of each group of the first nozzle (3) and the corresponding second nozzle (4) are different due to the different degrees of the angle between the two.

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