Low NOx combustor
By setting combustion heat conductors and heat conductors in the cavity in the burner, the peak flame temperature is reduced, and the problem of high temperature in the burner is solved, reducing the amount of NOx generation is achieved, and the environment is protected.
Patent Information
- Application Number
- CN202422205550.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-09
- Publication Date
- 2025-07-18
- Estimated Expiration
- 2034-09-09
AI Technical Summary
The temperature in existing burners remains high, which makes it difficult to reduce the amount of NOx generation.
Combustion heat conductors are used, including combustion heat conductors and heat conductors in the cavity, to form combustion channels and reduce the peak flame temperature.
Effectively reduce the peak flame temperature in the combustion channel, reduce the generation of NOx, and protect the environment.
Smart Images
Figure CN223121417U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of chemical equipment, in particular to a low-NOx burner. Background Art
[0002] The combustion of fuel gas mixed with air is a method to obtain energy and heat. The burner is used in cooperation with a furnace body, and the energy and heat obtained from combustion can be used in various fields of production and life. When burning under the conditions of high temperature and oxygen excess, nitrogen in the air reacts with oxygen to generate NOx.
[0003] NOx is harmful to the environment. In order to reduce NOx generated during combustion, there is a type of burner that uses a high-speed jet of fuel gas to suck the flue gas in the furnace into the burner. After the flue gas is mixed with the fuel, it can reduce the flame temperature and the generation of NOx.
[0004] The defects of this burner include that during combustion, the temperature in the burner and the area near the burner outlet remains high, resulting in difficulty in reducing the generation amount of NOx. Content of the Utility Model
[0005] The purpose of the utility model is to provide a low-NOx burner, which solves the problem of high temperature in the existing burner and reduces the generation amount of NOx.
[0006] To achieve this purpose, the utility model adopts the following technical solutions:
[0007] A low-NOx burner, comprising: a burner main body; and a combustion heat conducting member disposed at the outlet end of the burner main body. A combustion channel is formed inside the combustion heat conducting member, and a primary combustion zone and a part of a secondary combustion zone are located in the combustion channel. The combustion heat conducting member is used to reduce the peak flame temperature in the combustion channel.
[0008] In one preferred embodiment, the combustion heat conducting member is made of a porous medium.
[0009] In one preferred embodiment, the combustion heat conducting member is in a cylindrical shape, and the axis of the combustion heat conducting member is parallel to the axis of the burner main body, or the combustion heat conducting member is coaxially arranged with the burner main body.
[0010] In one preferred embodiment, a flue gas entrainment combustion zone is formed inside the low-NOx burner, and a cavity heat conducting member is disposed in the flue gas entrainment combustion zone. The cavity heat conducting member is used to reduce the peak flame temperature in at least part of the flue gas entrainment combustion zone.
[0011] In one preferred embodiment, a burner brick is provided inside the burner body, a flue gas entrainment combustion zone is formed within the range surrounded by the burner brick, and the cavity heat conducting member is disposed on at least a part of the inner wall of the burner brick.
[0012] In one preferred embodiment, a step is formed on the inner wall surface of the burner brick. The part of the burner brick below the step is of a straight cylinder structure, and the part of the burner brick above the step is a cone. Along the air flow direction, the cross section of the cone gradually decreases, and the cavity heat conducting member is located at the step.
[0013] In one preferred embodiment, the inner diameter of the cavity heat conducting member is equal to the inner diameter of the straight cylinder structure of the burner brick below the step.
[0014] In one preferred embodiment, the primary combustion zone and the secondary combustion zone are located within a range of 500 mm upward from the top end of the burner brick.
[0015] In one preferred embodiment, the cavity heat conducting member is made of a porous medium.
[0016] In one preferred embodiment, the cavity heat conducting member is in a cylindrical shape and is coaxially arranged with the burner body.
[0017] The low NOx burner disclosed by the present utility model includes a combustion heat conducting member. A combustion channel is formed inside the combustion heat conducting member. The primary combustion zone and part of the secondary combustion zone are located in the combustion channel. The combustion heat conducting member can transfer the temperature within its range to the outside of the range, thereby reducing the peak flame temperature in the combustion channel and reducing the generation level of NOx, which is beneficial to environmental protection. The primary combustion zone and part of the secondary combustion zone are fuel injection areas where combustion is intense and the peak flame temperature is high. The arrangement of the combustion heat conducting member can significantly reduce the peak flame temperature and reduce the generation of NOx. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 is a partial cross-sectional view of the low NOx burner provided by the specific embodiment of the present utility model;
[0019] Figure 2 is a top view of the low NOx burner provided by the specific embodiment of the present utility model.
[0020] In the figure:
[0021] 1, burner body; 2, combustion heat conducting member; 3, flue gas entrainment combustion zone; 4, cavity heat conducting member; 11, burner brick; 21, combustion channel. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0022] To make the above objects, features, and advantages of the present utility model more apparent and understandable, the following describes the specific embodiments of the present utility model in detail with reference to the accompanying drawings. Many specific details are set forth in the following description to facilitate a thorough understanding of the present utility model. However, the present utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.
[0023] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. These are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.
[0024] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present utility model, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically and clearly defined.
[0025] In the present utility model, unless otherwise clearly specified and limited, terms such as "mounted", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0026] In the present utility model, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is less than that of the second feature.
[0027] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation.
[0028] This embodiment discloses a low-NOx burner, which can be used in, but not limited to, the working conditions of chemical production. As Figure 1 and Figure 2 shown, the low-NOx burner includes a burner body 1 and a combustion heat-conducting member 2. Among them, the combustion heat-conducting member 2 is arranged at the outlet end of the burner body 1, and a combustion channel 21 is formed inside the combustion heat-conducting member 2. Due to the adoption of fuel staging technology, the burner is divided into a primary combustion zone, a secondary combustion zone, and a tertiary combustion zone, where the primary combustion zone and part of the secondary combustion zone are located in the combustion channel 21. The other structures of the burner are not limited, and any structures in the prior art for supplying gas and fuel to the burner body 1 can be used; the internal structure of the burner body 1 is also the same as that in the prior art.
[0029] The combustion heat-conducting member 2 can transfer the temperature within its range to the outside, thereby reducing the peak flame temperature in the combustion channel 21 and reducing the generation level of NOx, which is beneficial to environmental protection. The primary combustion zone and part of the secondary combustion zone are fuel injection areas, where the combustion is intense and the peak flame temperature is high. The setting of the combustion heat-conducting member 2 can significantly reduce the peak flame temperature and reduce the generation of NOx.
[0030] The specific material for preparing the combustion heat-conducting member 2 is not limited, as long as it has good heat-conducting performance. In this embodiment, the combustion heat-conducting member 2 is made of a porous medium. A porous medium is a substance composed of a solid skeleton and a large number of tiny voids densely grouped and separated by the skeleton. Heat can quickly transfer from the inside of the combustion heat-conducting member 2 to the outside through the tiny voids, which can quickly reduce the peak flame temperature in the combustion channel 21 and reduce the generation level of NOx. The specific structure and preparation material of the porous medium are not limited, and any porous medium that can withstand high temperatures in the prior art can be used.
[0031] The specific shape of the combustion heat-conducting member 2 is not limited, as long as it is conducive to heat conduction without affecting normal combustion. In this embodiment, the combustion heat-conducting member 2 is cylindrical, which is convenient for processing. The combustion heat-conducting member 2 has a large contact area with the hot air inside it, and the heat conduction efficiency is high. The axis of the combustion heat-conducting member 2 is parallel to the axis of the burner body 1, or the combustion heat-conducting member 2 is coaxially arranged with the burner body 1. The fuel can burn normally, and the heat and energy obtained from the combustion can be used normally without making too many improvements to the existing burner and the furnace body used in combination, which is more convenient to use and has a low cost.
[0032] On the basis of the above structure, a flue gas entrainment combustion zone 3 is formed inside the low-NOx burner. The flue gas entrainment combustion zone 3 includes a fuel injection zone. The fuel directly contacts the air and burns quickly and fully, so the combustion temperature in this zone is relatively high and more NOx will be generated. To solve this problem, a cavity heat-conducting member 4 is arranged in the flue gas entrainment combustion zone 3. The cavity heat-conducting member 4 is used to reduce the peak flame temperature in at least part of the flue gas entrainment combustion zone 3, thereby reducing the generation amount of NOx and achieving the purpose of environmental protection.
[0033] Specifically, a burner block 11 is arranged inside the burner body 1. The flue gas entrainment combustion zone 3 is formed within the range surrounded by the burner block 11. The cavity heat-conducting member 4 is arranged on at least part of the inner wall of the burner block 11. Among them, the specific structure of the burner block 11 is not limited, and various burner blocks 11 in the prior art are applicable.
[0034] In this embodiment, a step is formed on the inner wall surface of the burner block 11. The part of the burner block 11 below the step is of a straight cylinder structure; the part of the burner block 11 above the step is a cone, and along the gas flow direction, the cross-section of the cone gradually decreases. The step of the burner block 11 is the position where the fuel injection is concentrated, and the combustion temperature here is high. The cavity heat-conducting member 4 is located at the step. At least part of the outer wall surface of the cavity heat-conducting member 4 is attached to the burner block 11, which can efficiently transfer the heat from the inside of the cavity heat-conducting member 4 to the outside of the cavity heat-conducting member 4, and then transfer it to the surrounding environment through the burner block 11, thereby reducing the peak flame temperature and reducing the generation of NOx.
[0035] In order to reduce the obstruction to the normal flow of the combustion gas, the inner diameter of the cavity heat conducting member 4 is equal to the inner diameter of the straight cylindrical structure of the burner brick 11 below the step. When the gas flows through the cavity heat conducting member 4, it will not be obstructed, and while quickly conducting heat, it does not affect the normal operation of the burner.
[0036] Within a range of 500 mm upward from the top end of the burner brick 11, the fuel is in direct contact with the air and burns quickly and fully. This area is the primary combustion zone and the secondary combustion zone. Arranging the combustion heat conducting member 2 in this area helps to quickly conduct heat, reduce the peak flame temperature, and reduce the generation of NOx.
[0037] The specific preparation material of the cavity heat conducting member 4 is not limited as long as it can quickly conduct heat. The cavity heat conducting member 4 is made of a porous medium, and heat can quickly transfer from the inside of the cavity heat conducting member 4 to the outside through the tiny voids, which can effectively reduce the peak flame temperature in the flue gas entrainment combustion zone 3. The specific structure and preparation material of the porous medium are not limited, and any porous medium that can withstand high temperatures in the prior art can be used.
[0038] In addition, the gas flow rate is large inside and at the outlet of the burner brick 11, the local turbulence is intense, and the combustion reaction is significant. The porous medium has the effect of stabilizing the flame, making the combustion inside and at the outlet of the burner brick 11 more stable, reducing the turbulence phenomenon, and can also reduce the generation of NOx to a certain extent.
[0039] On the basis of the above structure, the cavity heat conducting member 4 is in a cylindrical shape, which is convenient for processing and has a low cost. The cavity heat conducting member 4 is coaxially arranged with the burner body 1, which does not affect the normal flow of the combustion gas and does not affect the normal use of the high burner.
[0040] Note that the above is only the preferred embodiment of the present invention and the technical principles applied. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described here. Various obvious changes, re-adjustments, and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, it can also include more other equivalent embodiments, and the scope of the present invention is determined by the scope of the appended claims.
Claims
1. Low NOx burner, characterized in that, Comprising: A burner body (1); and, A combustion heat-conducting member (2) provided at the outlet end of the burner body (1), a combustion channel (21) being formed inside the combustion heat-conducting member (2), a primary combustion zone and a partial secondary combustion zone being located in the combustion channel (21), and the combustion heat-conducting member (2) being configured to reduce the peak flame temperature in the combustion channel (21).
2. The low NOx burner according to claim 1, characterized in that, The combustion heat-conducting member (2) is made of a porous medium.
3. The low NOx burner according to claim 1, characterized in that, The combustion heat-conducting member (2) is cylindrical, and the axis of the combustion heat-conducting member (2) is parallel to the axis of the burner body (1), or the combustion heat-conducting member (2) is coaxially arranged with the burner body (1).
4. The low NOx burner according to any one of claims 1 to 3, characterized in that A flue gas entrainment combustion zone (3) is formed inside the low NOx burner, and a cavity heat-conducting member (4) is provided in the flue gas entrainment combustion zone (3), and the cavity heat-conducting member (4) is configured to reduce the peak flame temperature in at least a part of the flue gas entrainment combustion zone (3).
5. The low NOx burner according to claim 4, wherein, A burner block (11) is provided inside the burner body (1), the flue gas entrainment combustion zone (3) is formed within the range surrounded by the burner block (11), and the cavity heat-conducting member (4) is provided on at least a part of the inner wall of the burner block (11).
6. The low NOx burner according to claim 5, characterized in that, The inner wall surface of the burner block (11) forms a step, the part of the burner block (11) below the step is of a straight cylinder structure, the part of the burner block (11) above the step is a cone, and along the gas flow direction, the cross-section of the cone gradually decreases, and the cavity heat-conducting member (4) is located at the step.
7. The low NOx burner according to claim 6, characterized in that, The inner diameter of the cavity heat-conducting member (4) is equal to the inner diameter of the straight cylinder structure of the burner block (11) below the step.
8. The low NOx burner according to claim 5, characterized in that, The primary combustion zone and the secondary combustion zone are located within a range of 500 mm upward from the top end of the burner block (11).
9. The low NOx burner according to claim 4, characterized in that, The cavity heat-conducting member (4) is made of a porous medium.
10. The low NOx burner according to claim 4, characterized in that, The cavity heat-conducting member (4) is cylindrical, and the cavity heat-conducting member (4) is coaxially arranged with the burner body (1).