Air-cooled combustion head

Abstract

The utility model relates to an air-cooled combustion head which comprises a combustion disc, a baffle, a shell, a breather pipe and a cooling air pipe, the breather pipe comprises a first pipe and a second pipe, the combustion disc is arranged at the end of the shell and provided with a vent hole for the first pipe and the second pipe to output gas, and the vent hole is connected with the output end of the breather 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, a preset space distance exists between the adjacent pipes in the shell, the baffle is arranged in the shell, the output end of the cooling air pipe is connected with the baffle, and the input end of the second type of pipes is connected with the baffle. A cooling space allowing cooling gas to enter is formed among the baffle, the combustion disc and the shell, a plurality of cooling gas outlets are further formed in the combustion disc, and a preset distance exists between the cooling gas outlets and vent holes of the vent pipe. According to the utility model, the formation of nitrogen oxides can be inhibited, and low-emission combustion is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of combustion devices, and in particular to an air-cooled combustion head. Background Art

[0002] The general burner usually works by traditional combustion and staged combustion. Its working method is mainly to burn traditional fuels, such as gas and oil. For traditional fuels, the fuel is usually directly mixed with air and then burned in the combustion chamber. The combustion characteristics of gas and oil are relatively stable, and the combustion temperature and flame shape are easy to control. It is suitable for many combustion applications. However, the combustion of traditional fuels usually occurs under high temperature conditions. High temperature will cause nitrogen and oxygen to react in the air to form nitrogen oxides NOx (>150mg / Nm 3 ), such as nitric oxide and nitrogen dioxide, and secondly, incomplete combustion is also relatively common in the combustion process of traditional fuels.

[0003] At present, based on environmental considerations, in the actual working process, it is sometimes necessary to use premixed gas for combustion. Premixed gas combustion premixes fuel and air to make the fuel more sufficient and uniform during the combustion process. This uniform mixing can reduce the combustion temperature and the production of nitrogen oxides generated by the oxidation reaction, making it more environmentally friendly. The existing premixed burner can solve certain nitrogen oxide formation problems, but further improvements are still needed to further reduce the formation of nitrogen oxides. In addition, in some industrial kilns, the front end of the burner is connected to the furnace wall, and the temperature of the output end of the burner is at a high temperature of 600 to 900 degrees. The terminal temperature of the natural gas after mixing is too high, which is prone to safety risks. Utility Model Content

[0004] According to the technical problem raised above, an air-cooled burner head is provided.

[0005] The technical means adopted by the utility model are as follows:

[0006] A wind-cooled combustion head comprises a combustion disk, a baffle plate, a shell and a vent pipe and a cooling air pipe, the vent pipe comprising a first type of pipe and a second type of pipe, the combustion disk is arranged at the end of the shell, and is provided with vent holes for the first type of pipe and the second type of pipe to output gas, the vent holes are connected to the output ends of the vent pipe, the first type of pipe and the second type of pipe are both arranged inside the shell, the diameter of the first type of pipe gradually decreases from the cavity end to the combustion disk end, the first type of pipe is arranged inside the shell in a preset form, the second type of pipe is arranged inside the shell in a preset form, there is a preset spatial distance between adjacent pipes inside the shell, the baffle plate is arranged inside the shell, the output end of the cooling air pipe is connected to the baffle plate, the input end of the second type of pipe is connected to the baffle plate, a cooling space for cooling air to enter is formed between the baffle plate, the combustion disk and the shell, a plurality of cooling air outlets are also opened on the combustion disk, and there is a preset distance between the cooling air outlet and the vent hole of the vent pipe.

[0007] Furthermore, the axes of the first type of tubes and the second type of tubes are arranged in parallel along the longitudinal direction of the shell, and the longitudinal direction of the shell is the airflow output direction.

[0008] Furthermore, the shell includes a premixing chamber section and a discharge section, the air inlet ends of the first type of tube and the second type of tube are both arranged in the discharge section, and the length of the first type of tube is greater than that of the second type of tube.

[0009] Furthermore, the first type of tubes and the second type of tubes are arranged in a staggered manner, and there is at least one second type of tube between two adjacent first type of tubes. The second type of tubes can be arranged in intervals between the first type of tubes based on space division, or a plurality of second type of tubes can be arranged in a closely spaced arrangement in which they are continuously arranged.

[0010] Furthermore, the first type of tubes include a first type of long tube and a first type of short tube based on different setting positions. The first type of long tube and the first type of short tube have different lengths and different caliber ratios.

[0011] Furthermore, an ignition needle for high-voltage discharge and an ion sensing needle for flame detection are also arranged inside the shell.

[0012] Furthermore, a flow-disturbing structure is arranged inside the first type of tube.

[0013] Furthermore, a flow-disturbing structure is arranged inside the second type of tube.

[0014] Furthermore, the cooling air outlets are arranged at the outermost circle of the combustion disk and are evenly arranged circumferentially at a preset interval.

[0015] Compared with the prior art, the utility model has the following advantages: the premixing of gas and air is completed in the shell in front of the combustion disk of the utility model, and ignition is performed at the combustion disk to form flame combustion. The utility model arranges air outlet holes of different diameters on a combustion disk, wherein a first type of tube is a reducer tube, the diameter of which inside the shell is larger than that on the combustion disk side, and the first type of tube and the second type of tube are closely spaced. According to the fluid characteristics, the gas at the inlet of the first type of tube is gradually compressed, and the flow velocity at the outlet of the first type of tube will increase, while the second type of tube is a straight tube or a tube with a diameter reduction ratio smaller than that of the first type of tube, and has no acceleration effect or a very small acceleration effect. The prior art all carries out combustion at the same distance, but after the utility model is arranged, it can ensure that the flame combustion distance of the reducer hole will be farther, the combustion of the reducer tube and the non-reducer tube is divided into two areas, one is forward and the other is backward, the effect of concentrated heat release is split into two types, and the flame is divided in space. This arrangement reduces the thermal power density per unit volume, and the adiabatic temperature rise per unit volume will decrease, that is, after the low-speed flame and the high-speed flame are spaced, the combustion heat is dispersed while ensuring the overall combustion heat, and the effect of reducing the combustion temperature of the flame is reduced, which is beneficial to inhibiting the oxidation of nitrogen to form nitrogen oxides and achieving low-emission combustion. By setting up a cooling cavity, the heat from the high temperature of the burner head is taken away, and air cooling protection is provided for the shell and the burner head, which has a cooling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 This is a schematic diagram of the structure of Example 1 of the utility model.

[0018] Figure 2 This is a schematic structural diagram of another angle of embodiment 1 of the utility model.

[0019] Figure 3 This is a back structural diagram of Example 2 of the utility model.

[0020] Figure 4 This is a front structural diagram of Example 2 of the utility model.

[0021] In the figure: 1, combustion disk; 2, shell; 3, second type of pipe; 4, first type of pipe; 5, cooling air pipe; 6, second type of pipe vent; 7, first type of pipe vent; 8, cooling air outlet; 9, baffle plate. DETAILED DESCRIPTION

[0022] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0023] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0024] 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 utility model. 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.

[0025] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, the numerical expressions and numerical values ​​do not limit the scope of the utility model. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0026] In the description of the present utility model, it needs to 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. They are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise stated, 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. Therefore, they cannot be understood as limiting the scope of protection of the present utility model: the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0027] 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 their position devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0028] 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. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0029] like Figures 1 to 4As shown, an embodiment of the utility model discloses an air-cooled combustion head, comprising a combustion disk 1, a baffle plate 9, a shell 2 and a vent pipe, a cooling air pipe 5, the vent pipe comprising a first type of pipe 4 and a second type of pipe 3, the combustion disk is arranged at the end of the shell, in this embodiment, the end of the shell is flush with the exhaust end of the combustion disk, and the combustion disk is provided with vent holes 6 and 7 for the first type of pipe and the second type of pipe to output gas, the vent holes are connected to the output end of the first type of pipe and the output end of the second type of pipe, specifically, the connection here means that there is no gap between the two or there is a preset gap, and it can also be regarded as that the combustion disk body has a certain thickness, and the output end of the vent pipe is flush with the output side of the combustion disk, and in other optional embodiments, there is also a situation where it is shorter than the output side of the combustion disk, but at this time the vent pipe is still kept in the combustion disk, or is slightly longer than the output side of the combustion disk. The first type of tube and the second type of tube are both arranged inside the shell, and the diameter of the first type of tube gradually decreases from the cavity end to the combustion disk end. The first type of tube is arranged inside the shell in a preset form, and the second type of tube is arranged inside the shell in a preset form. There is a preset spatial distance between adjacent tubes inside the shell. The baffle plate is arranged inside the shell, and the output end of the cooling air pipe is connected to the baffle plate, and the input end of the second type of tube is connected to the baffle plate. A cooling space for cooling air to enter is formed between the baffle plate, the combustion disk and the shell. A number of cooling air outlets 9 are also opened on the combustion disk, and there is a preset distance between the cooling air outlets and the air holes of the ventilation pipe.

[0030] As an optional implementation, the diameter ratio of the large end and the small end of the first type of tube is 1.1 to 5. The larger the aperture size, the longer the distance, and the better the acceleration effect, but it needs to be set accordingly according to the actual application scenario. The second type of tube is a straight tube or a reducer with an aperture ratio smaller than that of the first type of tube, or the output end diameter is larger than the input end diameter, but this form needs to be adjusted according to the actual situation to avoid tempering.

[0031] The axes of the first type of tubes and the second type of tubes are arranged parallel to the longitudinal direction of the shell, and the longitudinal direction of the shell is the airflow output direction.

[0032] The shell includes a premixing chamber section and a spray section. The air inlet end of the first type of pipe and the air inlet end of the second type of pipe are both arranged in the spray section. The length of the first type of pipe is greater than that of the second type of pipe.

[0033] Specifically, the premixing chamber section is the area where gas and air are premixed. In other optional embodiments, the shell also includes a gas inlet, an air inlet, etc., and their specific layout and setting are adjusted according to actual conditions, such as directly entering the premixing chamber section or entering the premixing chamber section in a ring or other form.

[0034] The first type of tubes and the second type of tubes are arranged in a staggered manner, and there is at least one second type of tube between two adjacent first type of tubes. Here, the combustion disk is taken as a plane, that is, the ventilation holes of the first type of tubes and the ventilation holes of the second type of tubes are arranged in a staggered manner, and at least one second type of tube ventilation hole is arranged between two adjacent first type of tube ventilation holes. If there is no complete second type of tube hole on the straight line directly connecting the two adjacent first type of tube ventilation holes, then the adjacent hole is also at least a second type of tube. The second type of tubes can be arranged in a spaced manner based on the space division, or a plurality of second type of tubes can be arranged in a close arrangement in a continuous manner.

[0035] The first type of tubes include first type long tubes and first type short tubes based on different installation positions. The first type long tubes and the first type short tubes have different lengths and different diameter ratios. Specifically, the internal space of the shell is limited and the tube diameter is fixed. When the length-to-diameter ratio of the first type of tube is too large, the length of a portion of the first type of tube needs to be adjusted. Overall, the space inside the shell can be maximized at a preset interval.

[0036] In addition, in some application scenarios, it is not necessary to arrange them completely closely, such as with an array of second-type tubes in the middle and first-type tubes arranged at intervals in the circumferential direction outside the center.

[0037] An ignition needle for high-voltage discharge and an ion sensing needle for flame detection are also arranged inside the shell.

[0038] As an optional implementation manner, a flow-disturbing structure is arranged inside the first type of tube.

[0039] As one of the optional implementations, a straight tube may lead to a situation where the flame is not stable. Therefore, a spoiler structure is provided inside the second type of tube, which may be a straight-line segmentation or a cross-shaped segmentation. The spoiler structures commonly used in the art can be used in the present invention if feasible.

[0040] The cooling air outlets are arranged at the outermost circle of the combustion disk and are evenly arranged circumferentially at a preset interval.

[0041] In actual application, the second type of pipe is equivalent to back-filling into the gap of the first type of pipe, passing through the closely spaced gaps, and most of the premixed gas enters the first type of pipe. Different gradients form a speed buffer, and the closely spaced arrangement makes it possible to control the distance of the flame output by the first type of pipe and the second type of pipe well, preventing problems with flame stability. Each ventilation pipe forms a flame independently, and the differentiated airflow forms combustion points at different positions. The combustion points are staggered and no longer overlap each other. In this process, the cooling air pipe continuously outputs cooling air to take away the heat from the high temperature of the burner head, provide air-cooling protection for the shell and the burner head, and achieve a cooling effect. In this embodiment, the cooling air can be compressed air.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. An air-cooled burner head, characterized in that: The invention comprises a combustion disk, a baffle plate, a shell and a ventilation pipe and a cooling air pipe, wherein the ventilation pipe comprises a first type of pipe and a second type of pipe, the combustion disk is arranged at the end of the shell, and is provided with ventilation holes for the first type of pipe and the second type of pipe to output gas, the ventilation holes are connected to the output ends of the ventilation pipes, the first type of pipes and the second type of pipes are both arranged inside the shell, the diameter of the first type of pipes gradually decreases from the cavity end to the combustion disk end, the first type of pipes are arranged inside the shell in a preset form, the second type of pipes are arranged inside the shell in a preset form, and there is a preset spatial distance between adjacent pipes inside the shell, the baffle plate is arranged inside the shell, the output end of the cooling air pipe is connected to the baffle plate, and the input end of the second type of pipe is connected to the baffle plate, a cooling space for cooling air to enter is formed between the baffle plate, the combustion disk and the shell, a plurality of cooling air outlets are also opened on the combustion disk, and there is a preset distance between the cooling air outlets and the ventilation holes of the ventilation pipe.

2. The air-cooled burner head according to claim 1, characterized in that: The axes of the first type of tubes and the second type of tubes are arranged parallel to the longitudinal direction of the shell, and the longitudinal direction of the shell is the airflow output direction.

3. The air-cooled burner head according to claim 1, characterized in that: The shell includes a premixing chamber section and a spray section, the air inlet ends of the first type of tube and the second type of tube are both arranged in the spray section, and the length of the first type of tube is greater than that of the second type of tube.

4. The air-cooled burner head according to claim 1, characterized in that: The first type of tubes and the second type of tubes are arranged in a staggered manner, and there is at least one second type of tube between two adjacent first type of tubes. The second type of tubes can be arranged in intervals between the first type of tubes based on space division, or a plurality of second type of tubes can be arranged in a closely spaced arrangement in a continuous manner.

5. The air-cooled burner head according to claim 1, characterized in that: The first type of tubes include a first type of long tube and a first type of short tube based on different setting positions. The first type of long tube and the first type of short tube have different lengths and different caliber ratios.

6. The air-cooled burner head according to claim 1, characterized in that: An ignition needle for high-voltage discharge and an ion sensing needle for flame detection are also arranged inside the shell.

7. The air-cooled burner head according to claim 1, characterized in that: A flow-disturbing structure is arranged inside the first type of tube.

8. The air-cooled burner head according to claim 1, characterized in that: A flow-disturbing structure is arranged inside the second type of tube.

9. The air-cooled burner head according to claim 1, characterized in that: The cooling air outlets are arranged at the outermost circle of the combustion disk and are evenly arranged circumferentially at a preset interval.

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