Combustion head

Abstract

The invention relates to a combustion head which comprises a combustion disc, a shell and a ventilation pipe, the ventilation pipe comprises a first pipe and a second pipe, the combustion disc is arranged at the end of the shell, a ventilation hole for the first pipe and the second pipe to output gas is formed in the combustion disc, and the ventilation hole is connected with the output end of the ventilation pipe. The first type of pipes and the second type of pipes are arranged in the shell, the diameter of the first type of pipes is gradually reduced from the cavity end to the combustion disc end, the first type of pipes are arranged in the shell according to a preset form, the second type of pipes are arranged in the shell according to a preset form, and a preset space distance exists between every two adjacent pipes in the shell. After the device is arranged, it can be guaranteed that the flame combustion distance of the variable-diameter hole can be farther, nitrogen can be prevented from being oxidized to form nitrogen oxide, and low-emission combustion is achieved.

Description

Technical Field

[0001] This invention relates to the field of combustion device technology, and more particularly to a combustion head. Background Technology

[0002] Typical combustion heads usually operate using conventional or staged combustion methods. Their operation primarily involves burning conventional fuels such as coal gas and oil. For conventional fuels, combustion typically occurs by directly mixing the fuel with air within the combustion chamber. The combustion characteristics of coal gas and oil are relatively stable, and the combustion temperature and flame pattern are easily controlled, making them suitable for many combustion applications. However, the combustion of conventional fuels usually occurs under high-temperature conditions. High temperatures cause nitrogen and oxygen to react in the air to form nitrogen oxides (NOx) (>150 mg / Nm³). 3 For example, nitric oxide and nitrogen dioxide, and secondly, incomplete combustion is also relatively common in the combustion process of traditional fuels.

[0003] Currently, for environmental reasons, premixed gas combustion is sometimes required in practical applications. Premixed gas combustion, by pre-mixing fuel and air, ensures more complete and uniform combustion. This uniform mixing reduces combustion temperature and the generation of nitrogen oxides (NOx) from oxidation reactions, thus making it more environmentally friendly. Existing premixed burners can address some of the NOx formation issues, but further improvements are needed to further reduce NOx formation. Summary of the Invention

[0004] In response to the aforementioned technical problems, a combustion head is provided.

[0005] The technical means employed in this invention are as follows:

[0006] A burner head includes a combustion disc, a housing, and a vent pipe. The vent pipe includes a first type of pipe and a second type of pipe. The combustion disc is disposed at the end of the housing and has vent holes for the first and second type of pipes to output gas. The vent holes are connected to the output end of the vent pipe. Both the first and second type of pipes are disposed inside the housing. The diameter of the first type of pipe gradually decreases from the cavity end to the combustion disc end. The first type of pipes are arranged inside the housing in a preset pattern, and the second type of pipes are arranged inside the housing in a preset pattern. There is a preset spatial distance between adjacent pipes inside the housing.

[0007] Furthermore, the axes of both the first type of pipe and the second type of pipe are arranged parallel to the longitudinal direction of the casing, which is the airflow output direction.

[0008] Furthermore, the housing includes a premixing chamber and an ejection section, with the air inlet ends of both the first type of pipe and the second type of pipe located in the ejection section, and the length of the first type of pipe being greater than the length of the second type of pipe.

[0009] Furthermore, the first type of pipe and the second type of pipe are arranged in an alternating manner, with at least one second type of pipe between two adjacent first type of pipes. The second type of pipes can be arranged with first type of pipes spaced apart or in a dense arrangement of several second type of pipes arranged continuously, based on spatial division.

[0010] Furthermore, the first type of pipe includes a first type of long pipe and a first type of short pipe based on different installation positions. The first type of long pipe and the first type of short pipe have different lengths and different diameter ratios.

[0011] Furthermore, an ignition needle for high-voltage discharge and an ion sensing needle for detecting flames are also provided inside the housing.

[0012] Furthermore, the first type of pipe has a flow-disrupting structure inside.

[0013] Furthermore, the second type of pipe has a flow-disrupting structure inside.

[0014] Compared with the prior art, the present invention has the following advantages: the premixing of gas and air is completed in the shell in front of the combustion plate of the present invention, and ignition is carried out at the combustion plate to form flame combustion. This invention features gas outlets of different diameters on a combustion plate. The first type of pipe is a variable-diameter pipe, with its internal diameter being larger than that on the side of the combustion plate. The first and second types of pipes are arranged in a close-packed configuration. Based on fluid characteristics, the gas at the inlet of the first type of pipe is gradually compressed, increasing the flow velocity at its outlet. The second type of pipe, being a straight pipe or having a smaller diameter ratio than the first type, provides little or no acceleration. Existing technologies typically involve combustion at the same distance. However, this invention ensures a longer flame combustion distance for the variable-diameter pipes. The combustion of the variable-diameter pipes and the non-variable-diameter pipes is divided into two zones, one forward and one backward, splitting the concentrated heat release effect into two distinct phases. This spatial division of the flame reduces the heat power density per unit volume and decreases the adiabatic temperature rise per unit volume. By alternating between low-speed and high-speed flames, the overall combustion heat is maintained while dispersing the heat, reducing the flame temperature and effectively inhibiting the oxidation of nitrogen to form nitrogen oxides, thus achieving low-emission combustion. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention.

[0017] Figure 2 This is a schematic diagram of the structure from another angle in Embodiment 1 of the present invention.

[0018] Figure 3 This is a cross-sectional side view of Embodiment 1 of the present invention.

[0019] Figure 4 This is a rear structural diagram of Embodiment 2 of the present invention.

[0020] Figure 5 This is a front view of Embodiment 2 of the present invention.

[0021] Figure 6 This is a front side view of Embodiment 3 of the present invention.

[0022] Figure 7 This is a rear side view of Embodiment 4 of the present invention.

[0023] In the diagram: 1. Combustion disc; 2. Shell; 3. Type II pipe; 4. Type I pipe; 301. Inlet end of Type II pipe; 302. Outlet end of Type II pipe; 401. Inlet end of Type I pipe; 402. Outlet end of Type I pipe. Detailed Implementation

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0027] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0028] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0029] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0030] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0031] like Figures 1-7 As shown, this embodiment of the invention discloses a burner head, including a combustion disc 1, a housing 2, and a vent pipe. The vent pipe includes a first type of pipe 4 and a second type of pipe 3. The combustion disc is disposed at the end of the housing. In this embodiment, the end of the housing is flush with the gas outlet end of the combustion disc. The combustion disc has vent holes for the first and second type of pipes to output gas. The vent holes are connected to the output ends 402 of the first type of pipe and 302 of the second type of pipe. Specifically, this connection means that there is no gap between the two or there is a preset gap. It can also be considered that the combustion disc body has a certain thickness. The position of the output end of the vent pipe is flush with the output side of the combustion disc. In other optional embodiments, there is also a case where it is shorter than the output side of the combustion disc, but in this case, the vent pipe is still kept in the combustion disc, or slightly longer than the output side of the combustion disc. Both the first and second type of pipes are disposed inside the housing. The diameter of the first type of pipe gradually decreases from the cavity end to the combustion disc end. The first type of pipe is arranged inside the housing in a preset form, and the second type of pipe is arranged inside the housing in a preset form. There is a preset spatial distance between adjacent pipes inside the housing.

[0032] As an optional implementation, the diameter ratio of the large end to the small end of the first type of tube is 1.1 to 5. The larger the aperture and the longer the distance, the better the acceleration effect. However, it needs to be set according to the actual application scenario. The second type of tube is a straight tube or a variable diameter tube with an aperture ratio smaller than that of the first type of tube, or a tube with an output end diameter larger than that of the input end diameter. However, this form needs to be adjusted according to the actual situation to avoid backfire.

[0033] The axes of both the first type of tube and the second type of tube are arranged parallel to the longitudinal direction of the shell, which is the airflow output direction.

[0034] The housing includes a premixing chamber and an ejection section. The air inlet 401 of the first type of pipe and the air inlet 301 of the second type of pipe are both located in the ejection section. The length of the first type of pipe is greater than the length of the second type of pipe.

[0035] Specifically, the premixed section is a region for premixing gas and air. In other optional embodiments, the housing also includes a gas inlet, an air inlet, etc., and their specific arrangement and configuration can be adjusted according to the actual situation, such as directly entering the premixed section or entering the premixed section in a ring or other form.

[0036] The first and second types of pipes are arranged in an alternating pattern, with at least one second type pipe between two adjacent first type pipes. Taking the combustion plate as the plane, this means the vent holes of the first and second types of pipes are arranged alternately, with at least one second type pipe vent hole between two adjacent first type pipe vent holes. If there is no complete second type pipe hole on the straight line connecting two adjacent first type pipe vent holes, then the adjacent hole is also at least a second type pipe. Figure 7 As shown, the second type of pipe can be arranged with the first type of pipe spaced apart or in a dense arrangement of several second type of pipes arranged continuously, based on spatial division.

[0037] Based on different installation locations, the first type of pipe includes a first type of long pipe and a first type of short pipe. The lengths of the first type of long pipe and the first type of short pipe differ, and their diameter ratios also differ. Specifically, the internal space of the shell is limited, and its pipe diameter is fixed. When the length-to-diameter ratio of the first type of pipe is too large, it is necessary to adjust the length of a portion of the first type of pipe. Overall, the space utilization inside the shell can be maximized at preset intervals.

[0038] Furthermore, in some applications, a completely close arrangement is not necessary. For example, a second-type tube array can be used in the center, with first-type tubes spaced out around the center in the circumferential direction. Figure 4 , Figure 5 Disclosed embodiments.

[0039] Inside the housing are also an ignition needle for high-voltage discharge and an ion sensing needle for detecting flames.

[0040] like Figure 6 As shown, as one optional implementation, the first type of pipe is provided with a turbulence-inducing structure inside.

[0041] As one alternative implementation, a straight pipe may lead to low flame stability. Therefore, the second type of pipe is provided with a flow-disrupting structure inside. Specifically, it can be a straight-line segment or a cross-shaped segment. Commonly used flow-disrupting structures in the art can be used in this invention where feasible.

[0042] In practical applications, the second type of tube is essentially backfilled into the gaps of the first type of tube, passing through the closely packed gaps. Most of the premixed gas enters the first type of tube, and different gradients form a velocity buffer. The close-packed arrangement of the first and second type of tubes allows for excellent control of the flame distance, preventing flame stability issues. Each vent tube independently forms a flame, and the differentiated airflow creates combustion points at different locations. The combustion points are staggered and no longer overlap with each other.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A combustion head, characterized in that, The device includes a combustion disc, a housing, and a vent pipe. The vent pipe includes a first type of pipe and a second type of pipe. The combustion disc is located at the end of the housing and has vent holes for the first and second type of pipes to output gas. The vent holes are connected to the output ends of the vent pipes. Both the first and second type of pipes are located inside the housing. The diameter of the first type of pipe gradually decreases from the cavity end to the combustion disc end. The first type of pipes are arranged inside the housing in a preset pattern, and the second type of pipes are arranged inside the housing in a preset pattern. There is a preset spatial distance between adjacent pipes inside the housing.

2. The combustion head according to claim 1, characterized in that, The axes of both the first type of tube and the second type of tube are arranged parallel to the longitudinal direction of the shell, which is the airflow output direction.

3. The combustion head according to claim 1, characterized in that, The housing includes a premixing chamber and an ejection section. The air inlet ends of both the first type of pipe and the second type of pipe are located in the ejection section, and the length of the first type of pipe is greater than the length of the second type of pipe.

4. The combustion head according to claim 1, characterized in that, The first type of pipe and the second type of pipe are arranged in an alternating manner, with at least one second type of pipe between two adjacent first type of pipes. The second type of pipes can be arranged with first type of pipes spaced apart or in a dense arrangement of several second type of pipes arranged continuously, based on spatial division.

5. The combustion head according to claim 1, characterized in that, The first type of pipe includes a first type of long pipe and a first type of short pipe based on the different installation positions. The first type of long pipe and the first type of short pipe have different lengths and different diameter ratios.

6. The combustion head according to claim 1, characterized in that, Inside the housing are also an ignition needle for high-voltage discharge and an ion sensing needle for detecting flames.

7. The combustion head according to claim 1, characterized in that, The first type of pipe has a flow-disrupting structure inside.

8. The combustion head according to claim 1, characterized in that, The second type of pipe has a flow-disrupting structure inside.

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