Interval type wide-combustion-range multi-fuel gas combustor

Abstract

The utility model discloses an interval type wide-combustion-range multi-fuel gas burner, which belongs to the technical field of gas diffusion combustion and comprises a fuel preheating and distributing cavity, and one end of the fuel preheating and distributing cavity is connected with an air and fuel distributing channel. The air and fuel distribution channel comprises a plurality of fuel and air distribution channels which are arranged at intervals and are not communicated; the fuel preheating and distributing cavity comprises a plurality of fuel and air channels which are arranged at intervals and are not communicated with each other; the fuel channel comprises a plurality of fuel distribution channels which are not communicated with one another, and the fuel distribution channels are connected with the fuel distribution channel; the air channel comprises a plurality of air distribution channels which are not communicated, and the air distribution channels are communicated with the air distribution channel. The air distribution channel and the fuel distribution channel are arranged at intervals and connected with the air distribution channel and the fuel distribution channel respectively, so that air and fuel are in multi-channel jet flow, mixing of the fuel in the combustion process is enhanced, the temperature uniformity is improved, the flame length is shortened, the combustion range is wider, the volume power density is improved, and safety is higher.

Description

Technical Field

[0001] This utility model belongs to the field of gas diffusion combustion technology, specifically relating to an intermittent wide combustion range multi-fuel gas burner. Background Technology

[0002] The statements in this section are merely background information related to this utility model and do not necessarily constitute prior art.

[0003] Maintaining flame stability is a challenging problem that needs to be solved in the practical application of many gas burners. Existing burners typically employ premixed combustion, swirling diffusion combustion, porous media combustion, and catalytic combustion techniques to shorten the combustion flame length.

[0004] Current research primarily focuses on premixed combustion, where the oxidizer and fuel are mixed before entering the combustion chamber for combustion. Multi-fuel gas burners employing premixed fuel designs can easily achieve high volumetric power density in low-temperature air conditions. However, they cannot guarantee against backfire (the rapid retraction of the flame into the burner orifice, which can lead to explosions and burner head damage) caused by preheating of the air after premixing. Non-premixed combustion, where the oxidizer and fuel burn during the mixing process, avoids backfire, but it is prone to incomplete combustion.

[0005] To address the problem of incomplete combustion that often occurs in non-premixed combustion, patent CN108131670A discloses a miniature Swiss roll burner suitable for non-premixed combustion. By arranging the fuel passage and oxidant passage alternately with two exhaust passages and allowing them to flow in opposite directions, the fuel and oxidant are preheated by the high-temperature gas in the exhaust passages on their way to the combustion chamber. They then undergo counter-current mixing at the center of the burner before entering the combustion chambers on both sides for combustion. This effectively achieves thorough mixing of the fuel and oxidant and a stable flame.

[0006] The above solution has some problems: it does not have the function of satisfying the combustion of multiple fuels and improving the lean combustion limit, and the volumetric power density of the burner is relatively low. Utility Model Content

[0007] To address the aforementioned problems, this utility model provides an intermittent wide-range multi-fuel gas burner. The fuel preheating and distribution chamber is equipped with intermittent air and fuel distribution channels, which are connected to the air and fuel distribution channels respectively. This allows air and fuel to form a multi-channel jet within the fuel preheating and distribution chamber, enhancing fuel mixing during combustion, improving temperature uniformity, shortening flame length, resulting in a wider combustion range, increased volumetric power density, and higher safety. A fuel mixing chamber and flow equalization orifice plate are installed above the fuel distribution channels, enabling pre-mixing of various gaseous fuels before intermittent diffusion combustion with air, thus exhibiting stable combustion characteristics of multiple fuel gases.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A multi-fuel gas burner with a wide combustion range and intermittent operation includes a fuel preheating and distribution chamber, one end of which is connected to an air and fuel distribution channel.

[0010] The air and fuel distribution channels include multiple spaced-apart fuel distribution channels and air distribution channels that are not interconnected; the fuel preheating and distribution chamber includes multiple spaced-apart fuel channels and air channels that are not interconnected.

[0011] The fuel passage includes multiple independent fuel diversion passages, which are connected to the fuel distribution passage; the air passage includes multiple independent air diversion passages, which are connected to the air distribution passage.

[0012] Preferably, the end of the fuel preheating and distribution chamber away from the air and fuel distribution channel is connected to the combustion chamber, and the end of the air and fuel distribution channel away from the fuel preheating and distribution chamber is connected to the air chamber.

[0013] Preferably, the outlets of the air diversion channel and the fuel diversion channel are on the same plane and both face the combustion chamber; a tail exhaust gas channel is provided at the end of the combustion chamber away from the fuel preheating and distribution chamber.

[0014] Preferably, the air distribution channel opens towards the air cavity and is divided into multiple air separation channels of the same size by multiple air separation plates.

[0015] Preferably, the air diversion channel and the air separation channel are connected in a one-to-one correspondence.

[0016] Preferably, a fuel mixing chamber is provided at the top of the air and fuel distribution channel, and multiple connecting pipes are fixedly installed on the fuel mixing chamber to connect to different fuel pipelines.

[0017] Preferably, the fuel distribution channel is closed on the side facing the air cavity and open on the side facing the fuel mixing chamber.

[0018] Preferably, an air separator plate is also provided at the top of the air distribution channel to separate the air distribution channel from the fuel mixing chamber.

[0019] Preferably, a flow equalization orifice plate is provided between the fuel mixing chamber and the air and fuel distribution channel.

[0020] Preferably, the flow equalization plate is provided with a plurality of flow equalization holes of the same size, and the flow equalization holes are arranged in a rectangular array to cover the entire flow equalization plate.

[0021] Compared with the prior art, the advantages and positive effects of this utility model are:

[0022] This invention features a fuel preheating and distribution chamber with spaced air and fuel diversion channels connected to the air and fuel distribution channels, respectively. This creates a multi-channel jet of air and fuel within the chamber, enhancing fuel mixing during combustion, improving temperature uniformity, and shortening the flame length. Furthermore, because air and fuel cannot be pre-mixed but mix during combustion within the combustion chamber, the intermittent diffusion of small flames results in a wider combustion range, effectively increasing volumetric power density and enhancing safety. Additionally, when the air is preheated, it exchanges heat with the fuel through the preheating and distribution chamber, increasing the fuel's chemical reaction rate and combustibility, effectively expanding the lean combustion boundary.

[0023] This invention features a fuel mixing chamber and a flow equalization plate above the fuel distribution channel, enabling the pre-mixing of various gaseous fuels before their diffusion combustion with air, thus exhibiting stable combustion characteristics for multiple fuel gases. Attached Figure Description

[0024] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0025] Figure 1 This is a three-dimensional view of the burner as described in an embodiment of this utility model;

[0026] Figure 2 This is a perspective view of the fuel preheating and distribution chamber, air and fuel distribution channel according to an embodiment of the present invention;

[0027] Figure 3 This is a top view of the air and fuel distribution channel according to an embodiment of the present invention;

[0028] Figure 4This is a schematic diagram of the air distribution channel according to an embodiment of the present utility model;

[0029] Figure 5 This is an embodiment of the present utility model. Figure 1 or Figure 2 Right view sectional view;

[0030] In the picture:

[0031] 1. Fuel preheating and distribution chamber; 11. Fuel passage; 111. Fuel diversion passage; 12. Air passage; 121. Air diversion passage; 2. Combustion chamber; 3. Air chamber; 4. Air and fuel distribution passage; 41. Fuel distribution passage; 42. Air distribution passage; 421. Air separator plate; 422. Air separation passage; 5. Fuel mixing chamber; 51. First fuel connection pipe; 52. Second fuel connection pipe; 53. Flow equalization orifice plate. Detailed Implementation

[0032] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0033] The present invention will now be described in detail with reference to the accompanying drawings. This embodiment discloses an intermittent wide-range multi-fuel gas burner, such as... Figure 1 , Figure 2 As shown, the system includes a fuel preheating and distribution chamber 1, one end of which is connected to a combustion chamber 2, and the other end to an air chamber 3. An air and fuel distribution channel 4 and a fuel mixing chamber 5 are provided between the fuel preheating and distribution chamber 1 and the air chamber 3. It can be understood that the combustion chamber 2 is used for fuel and air combustion, and air enters the air and fuel distribution channel 4 via the air chamber 3.

[0034] like Figure 1 , Figure 2As shown, the fuel mixing chamber 5 is located at the top of the air and fuel distribution channel 4. Multiple connecting pipes are fixedly installed on the fuel mixing chamber 5 for connecting different fuel pipelines. In this embodiment, two connecting pipes are provided: a first fuel connecting pipe 51 and a second fuel connecting pipe 52, used to transport two different fuels into the fuel mixing chamber 5 for mixing. A flow equalization orifice plate 53 is provided between the fuel mixing chamber 5 and the air and fuel distribution channel 4. The flow equalization orifice plate 53 has multiple flow equalization orifices of the same size, arranged in a rectangular array to fill the entire flow equalization orifice plate 53. The mixed fuel enters the air and fuel distribution channel 4 through the flow equalization orifice plate 53, ensuring that the two fuels are relatively evenly mixed upon entering the air and fuel distribution channel 4. It is understood that in some embodiments, ejector-type, swirling-type, and other mixing and flow equalization schemes with the same function can also be used.

[0035] like Figure 1 , Figure 3 As shown, the air and fuel distribution channel 4 includes multiple fuel distribution channels 41 and multiple air distribution channels 42; the fuel distribution channels 41 and air distribution channels 42 are spaced apart and do not communicate with each other; and, as Figure 1 As shown, the fuel distribution channel 41 is closed on the side facing the air cavity 3 and open on the side facing the fuel mixing chamber 5. The function of the fuel distribution channel 41 is a fuel distribution transition zone, that is, only the mixed fuel flowing from the flow equalization orifice plate 53 flows in the fuel distribution channel 41.

[0036] like Figure 1 , Figure 3 , Figure 4 As shown, the air distribution channel 42 opens towards the air cavity 3 and is divided into multiple air separation channels 422 of uniform size by multiple air partitions 421. An air partition is also provided at the top of the air distribution channel to separate it from the fuel mixing chamber. The topmost air partition 421 prevents mixed fuel from entering. In other words, the air flowing from the air cavity 3, after entering the spaced-apart air distribution channels 42, is also divided by the air partitions 421, resulting in a more even flow into the different air separation channels 422. The uniform distribution of air is achieved through the air distribution channel 42 and the air separation channels 422. It can be understood that air flows horizontally in the air distribution channel 42, while fuel flows vertically in the fuel distribution channel 41. In this embodiment, the two are perpendicular and do not communicate with each other.

[0037] like Figure 5As shown, the fuel preheating and distribution chamber 1 includes multiple fuel channels 11 and multiple air channels 12, which are spaced apart and do not communicate with each other. The fuel channels 11 are connected to the fuel distribution channel 41, and the air channels 12 are connected to the air distribution channel 42.

[0038] like Figure 5 As shown, the fuel passage 11 includes multiple fuel diversion channels 111, which are not interconnected. The mixed fuel in the fuel distribution channel 41 flows evenly into the fuel diversion channels 111. The air passage 12 includes multiple air diversion channels 121, which are not interconnected. The air diversion channels 121 are connected to the air distribution channel 42, and each air diversion channel 121 is also connected to an air separation channel 422. That is, air flows into the air diversion channels 121 through the air separation channel 422.

[0039] like Figure 1 As shown, the outlets of the air diversion channel 121 and the fuel diversion channel 111 are on the same plane, both facing the combustion chamber 2. Air enters the fuel preheating and distribution chamber 1 from the air cavity 3, and then, together with the fuel in the fuel diversion channel 111, it is ignited at the outlet of the fuel preheating and distribution chamber 1, achieving mixed combustion in the combustion chamber 2. This embodiment adopts an intermittent diffusion small flame combustion scheme, which makes the combustion range wider and effectively improves the volumetric power density. It can be understood that a tail exhaust gas channel is set at the end of the combustion chamber away from the fuel preheating and distribution chamber for the exhaust of flue gas after combustion. The air in the air diversion channel 121 and the fuel in the fuel diversion channel 111 both flow horizontally and enter the combustion chamber together.

[0040] In the burner of this embodiment, the fuel channel and air channel are spaced apart, and the air distribution channel and fuel distribution channel are also spaced apart, resulting in a multi-channel jet of air and fuel. This enhances fuel mixing during combustion, improves temperature uniformity, and consequently shortens the flame length. When the air is preheated, it exchanges heat with the fuel through the fuel preheating and distribution chamber, increasing the chemical reaction rate of the fuel and thus improving its combustibility.

[0041] The burner in this embodiment, through a technique of intermittent preheating and diffusion of small flames, can effectively expand the lean combustion boundary, shorten the flame length, and avoid premature mixing of fuel and preheated air, thus improving safety. Shortening the flame length also reduces temperature unevenness in the combustion core area; the pre-mixing of multiple gaseous fuels before intermittent diffusion combustion with air can also achieve stable combustion characteristics of multiple fuel gases.

[0042] It is also understandable that in the fuel preheating and distribution chamber 1, the cross-sectional shapes of the fuel distribution channel and the air distribution channel can be other shapes. Similarly, the cross-sectional shape of the air separation channel 422 must correspond to the air distribution channel to ensure proper connection. For example, a corrugated shape.

[0043] In this embodiment, the power Q of the burner and the volume V of the combustion chamber depend on the cross-sectional area A of the fuel preheating and distribution chamber. Generally, it is considered that the larger Q and A are, the smaller V is.

[0044] Although the specific embodiments of the present utility model have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present utility model. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solution of the present utility model are still within the scope of protection of the present utility model.

Claims

1. A multi-fuel gas burner with an intermittent wide combustion range, characterized in that, Includes a fuel preheating and distribution chamber, one end of which is connected to an air and fuel distribution channel; The air and fuel distribution channels include multiple spaced-apart fuel distribution channels and air distribution channels that are not interconnected; the fuel preheating and distribution chamber includes multiple spaced-apart fuel channels and air channels that are not interconnected. The fuel passage includes multiple independent fuel diversion passages, which are connected to the fuel distribution passage; the air passage includes multiple independent air diversion passages, which are connected to the air distribution passage.

2. The multi-fuel gas burner with a wide combustion range and intermittent combustion as described in claim 1, characterized in that, The end of the fuel preheating and distribution chamber away from the air and fuel distribution channel is connected to the combustion chamber, and the end of the air and fuel distribution channel away from the fuel preheating and distribution chamber is connected to the air chamber.

3. A multi-fuel gas burner with an intermittent wide combustion range as described in claim 2, characterized in that, The outlets of the air splitting channel and the fuel splitting channel are on the same plane and both face the combustion chamber; An exhaust gas passage is provided at the end of the combustion chamber away from the fuel preheating and distribution chamber.

4. A multi-fuel gas burner with an intermittent wide combustion range as described in claim 2, characterized in that, The air distribution channel opens towards the air cavity and is divided into multiple air separation channels of the same size by multiple air partitions.

5. A multi-fuel gas burner with an intermittent wide combustion range as described in claim 4, characterized in that, The air diversion channel and the air separation channel are connected in a one-to-one correspondence.

6. A multi-fuel gas burner with a wide combustion range and intermittent combustion characteristics as described in claim 1, characterized in that, A fuel mixing chamber is installed at the top of the air and fuel distribution channel, and multiple connecting pipes are fixedly installed on the fuel mixing chamber to connect to different fuel pipelines.

7. A multi-fuel gas burner with an intermittent wide combustion range as described in claim 6, characterized in that, The fuel distribution channel is closed on the side facing the air chamber and open on the side facing the fuel mixing chamber.

8. A multi-fuel gas burner with a wide combustion range and intermittent combustion characteristics as described in claim 6, characterized in that, An air separator plate is also installed at the top of the air distribution channel to separate the air distribution channel from the fuel mixing chamber.

9. A multi-fuel gas burner with a wide combustion range and intermittent combustion characteristics as described in claim 6, characterized in that, A flow equalization orifice plate is installed between the fuel mixing chamber and the air and fuel distribution channels.

10. A multi-fuel gas burner with an intermittent wide combustion range as described in claim 9, characterized in that, The flow equalization plate is provided with multiple flow equalization holes of the same size, and the flow equalization holes are arranged in a rectangular array to cover the entire flow equalization plate.

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