Premixing device, low-nitrogen burner and fuel gas equipment

Abstract

The invention discloses a premixing device, a low-nitrogen combustor and gas equipment, and relates to the technical field of combustion equipment.The premixing device comprises a first mixing assembly and a spoiler, the first mixing assembly comprises at least one first mixing body, a combustion-supporting gas input pipe, a combustible gas input pipe and a mixed gas output pipe, the first mixing main body is provided with a combustion-supporting gas inlet, a combustible gas inlet, a mixed gas outlet and a mixed flow channel, and the combustion-supporting gas inlet and the combustible gas inlet are communicated with the mixed gas outlet through the mixed flow channel; the spoiler is arranged in the mixed flow channel and is used for prolonging the flow channel path of the air flow in the mixed flow channel; the combustion-supporting gas input pipe is in butt joint with the combustion-supporting gas inlet, the combustible gas input pipe is in butt joint with the combustible gas inlet, and the mixed gas input pipe is in butt joint with the mixed gas outlet. According to the technical scheme provided by the invention, combustible gas and combustion-supporting gas are uniformly mixed by the premixing device and then are combusted, so that the combustion stability is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of combustion equipment, and in particular to a premixing device, a low-nitrogen burner, and a gas equipment. Background Art

[0002] Low-nitrogen burners are important equipment for industrial oil-fired boilers and gas-fired boilers. They ensure stable ignition and complete combustion of the fuel. When low-nitrogen burners are used, due to the high concentration of the gas, incomplete combustion will occur. It is necessary to use a premixing device to mix the gas and air evenly before combustion, so that the combustion is more complete and stable. In the prior art, the premixing device does not mix evenly, which will affect the combustion. Summary of the invention

[0003] The main purpose of the present invention is to provide a premixing device, a low-nitrogen burner, and a gas equipment, aiming to enable the premixing device to mix combustible gas and supporting gas evenly and then burn them, thereby improving the stability of combustion.

[0004] To achieve the above object, the present invention provides a premixing device, comprising:

[0005] A first mixing assembly, comprising at least one first mixing body, a combustion-supporting gas inlet pipe, a combustible gas inlet pipe and a mixed gas outlet pipe, wherein the first mixing body is provided with a combustion-supporting gas inlet, a combustible gas inlet, a mixed gas outlet and a mixed flow channel, wherein the mixed flow channel connects the combustion-supporting gas inlet and the combustible gas inlet with the mixed gas outlet; and

[0006] A spoiler, disposed in the mixed flow channel, for extending the flow path of the airflow in the mixed flow channel;

[0007] The combustion-supporting gas input pipe is connected to the combustion-supporting gas inlet, the combustible gas input pipe is connected to the combustible gas inlet, and the mixed gas input pipe is connected to the mixed gas outlet.

[0008] In one embodiment, the spoiler is arranged in a curved shape.

[0009] In one embodiment, the spoiler is spirally arranged along the length direction of the mixing channel.

[0010] In one embodiment, the first mixing body is provided in plurality, and the plurality of first mixing bodies are arranged in parallel.

[0011] In one embodiment, the combustion-supporting gas input pipe is provided with a plurality of first branch pipes, and the plurality of combustion-supporting gas inlets are connected to the combustion-supporting gas input pipe through the first branch pipes; and / or,

[0012] The combustible gas input pipe is provided with a plurality of second branch pipes, and the plurality of combustible gas inlets are connected to the combustible gas input pipe through the second branch pipes; and / or,

[0013] The mixed gas output pipe is provided with a plurality of third branch pipes, and a plurality of the mixed gas outlets are connected with the mixed gas output pipe through the third branch pipes.

[0014] In one embodiment, the premixing device further comprises:

[0015] A second mixing assembly includes a second mixing body, the second mixing body includes an inlet, an outlet, and a mixing chamber communicating with the inlet and the outlet, the inlet is connected to the mixed gas output pipe; and

[0016] A stirring member is movably arranged in the mixing chamber and is used for stirring the gas in the mixing chamber.

[0017] In one embodiment, the inlet has a first installation height H1, the outlet has a second installation height H2, and the stirring element has a third installation height H3;

[0018] Wherein, H1>H3>H2;

[0019] Alternatively, H2>H3>H1.

[0020] In one embodiment, a filter is provided between the combustion-supporting gas input pipe and the combustion-supporting gas inlet to filter impurities in the combustion-supporting gas; and / or,

[0021] A filter is provided between the combustible gas input pipe and the combustible gas inlet for filtering impurities in the combustible gas.

[0022] The present invention further provides a low nitrogen burner, comprising the premixing device, wherein the premixing device comprises:

[0023] A first mixing assembly, comprising at least one first mixing body, a combustion-supporting gas inlet pipe, a combustible gas inlet pipe and a mixed gas outlet pipe, wherein the first mixing body is provided with a combustion-supporting gas inlet, a combustible gas inlet, a mixed gas outlet and a mixed flow channel, wherein the mixed flow channel connects the combustion-supporting gas inlet and the combustible gas inlet with the mixed gas outlet; and

[0024] A spoiler, disposed in the mixed flow channel, for extending the flow path of the airflow in the mixed flow channel;

[0025] Wherein, the combustion-supporting gas input pipe is connected to the combustion-supporting gas inlet, the combustible gas input pipe is connected to the combustible gas inlet, and the mixed gas input pipe is connected to the mixed gas outlet.

[0026] The present invention further provides a gas equipment, comprising the low-nitrogen burner, the low-nitrogen burner comprising a premixing device, the premixing device comprising:

[0027] A first mixing assembly, comprising at least one first mixing body, a combustion-supporting gas inlet pipe, a combustible gas inlet pipe and a mixed gas outlet pipe, wherein the first mixing body is provided with a combustion-supporting gas inlet, a combustible gas inlet, a mixed gas outlet and a mixed flow channel, wherein the mixed flow channel connects the combustion-supporting gas inlet and the combustible gas inlet with the mixed gas outlet; and

[0028] A spoiler, disposed in the mixed flow channel, for extending the flow path of the airflow in the mixed flow channel;

[0029] The combustion-supporting gas input pipe is connected to the combustion-supporting gas inlet, the combustible gas input pipe is connected to the combustible gas inlet, and the mixed gas input pipe is connected to the mixed gas outlet.

[0030] The technical solution of the present invention extends the flow path of the airflow in the mixing channel by arranging a spoiler in the mixing channel, which on the one hand increases the contact range between the airflows, and on the other hand increases the outflow time of the airflows and extends the diffusion time between the airflows, so that the premixing device mixes the combustible gas and the supporting gas evenly and then burns them, thereby improving the stability of combustion. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention 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 only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0032] Figure 1 A schematic structural diagram of an embodiment of a premixing device provided by the present invention;

[0033] Figure 2 for Figure 1 A vertical cross-sectional view of the premixing device;

[0034] Figure 3 for Figure 1 A transverse cross-sectional view of the premixing device;

[0035] Figure 4 It is a schematic structural diagram of the filter element of the present invention.

[0036] Description of Figure Numbers:

[0037] 100. Premixing device;

[0038] 1. first mixing assembly; 11. first mixing body; 111. mixed flow channel; 12. combustion-supporting gas input pipe; 13. combustible gas input pipe; 14. mixed gas output pipe; 15. spoiler; 16. first branch pipe; 17. second branch pipe; 18. third branch pipe;

[0039] 2. Second mixing assembly; 21. Second mixing body; 211. Inlet; 212. Outlet; 213. Mixing chamber; 22. Stirring element;

[0040] 3. Filter element;

[0041] 4. Seals;

[0042] 5. The first fixing plate;

[0043] 6. Second fixing plate;

[0044] 7. The first groove;

[0045] 8. The second groove.

[0046] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0049] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0050] Low-nitrogen burners are important equipment for industrial oil-fired boilers and gas-fired boilers. They ensure stable ignition and complete combustion of the fuel. When low-nitrogen burners are used, due to the high concentration of the gas, incomplete combustion will occur. It is necessary to use a premixing device to mix the gas and air evenly before combustion, so that the combustion is more complete and stable. In the prior art, the premixing device does not mix evenly, which will affect the combustion.

[0051] In order to solve the above technical problems, Figures 1 to 3 As shown, a premixing device 100 proposed by the present invention comprises a first mixing assembly 1 and a spoiler 15. The first mixing assembly 1 comprises at least one first mixing body 11, a combustion-supporting gas inlet pipe 12, a combustible gas inlet pipe 13 and a mixed gas outlet pipe 14. The first mixing body 11 is provided with a combustion-supporting gas inlet, a combustible gas inlet, a mixed gas outlet and a mixing channel 111. The mixing channel 111 connects the combustion-supporting gas inlet and the combustible gas inlet with the mixed gas outlet. The spoiler 15 is arranged in the mixing channel 111 to extend the flow path of the gas flow in the mixing channel 111; wherein the combustion-supporting gas inlet pipe 12 is connected to the combustion-supporting gas inlet, the combustible gas inlet pipe 13 is connected to the combustible gas inlet, and the mixed gas inlet pipe is connected to the mixed gas outlet.

[0052] The technical solution of the present invention extends the flow path of the airflow in the mixing channel 111 by arranging a spoiler 15 in the mixing channel 111, which on the one hand increases the contact range between the airflows, and on the other hand increases the outflow time of the airflows and extends the diffusion time between the airflows, so that the premixing device 100 mixes the combustible gas and the supporting gas evenly and then burns them, thereby improving the stability of combustion.

[0053] Therefore, by providing the spoiler 15, the contact area and contact frequency between the airflows can be significantly increased, which helps to achieve more uniform and sufficient mixing.

[0054] It is understandable that the spoiler 15 can be an obstacle of various shapes and sizes, such as a fin, a baffle or a spiral blade. The spoiler 15 changes the flow direction of the airflow, so that the airflows that may be parallel or nearly parallel are forced to intersect with each other. Not only does it increase the relative movement between the airflows, but it also promotes the exchange of matter and energy between different airflows (in this article, namely, combustible gas and combustion-supporting gas). In the mixed flow channel 111, the outflow time of the airflow refers to the time required for the airflow to reach the other end. The longer this time is, the more uniform the airflow will be in the mixed flow channel 111. The spoiler 15 increases the residence time of the airflow in the mixed flow channel 111 by changing the flow path of the airflow.

[0055] It should be noted here that "diffusion" in physics refers to the process of spontaneous migration of gas from a high-concentration area to a low-concentration area. "Diffusion" in this article refers to the spontaneous migration process caused by the difference in concentration between high-concentration combustible gas and high-concentration oxidant gas when they come into contact, so that the two gradually become uniform in the process of contacting each other.

[0056] In one embodiment, the spoiler 15 is bent.

[0057] With such an arrangement, the curved shape will change the state of the airflow in the fluid flow direction, increase the shear force between airflow layers, help break the laminar state of the airflow, form vortices and promote mixing.

[0058] Specifically, in one embodiment, the spoiler 15 is spirally disposed along the length direction of the mixing channel 111 .

[0059] With such arrangement, the spiral spoiler 15 generates a vortex so that the airflow is evenly distributed in the cross section of the mixing channel 111, thereby improving the uniformity of airflow mixing.

[0060] In one embodiment, the first mixing body 11 is provided in plurality, and the plurality of first mixing bodies 11 are arranged in parallel.

[0061] In this way, by arranging a plurality of first mixing bodies 11 in parallel, the cross-sectional area of ​​the mixing channel can be increased, more contact surfaces can be provided, and the contact between the airflows can be more complete, thereby improving the mixing efficiency. At the same time, each mixing body has an independent spoiler 15 or other premixing device 100 inside, and the parallel arrangement can also ensure that the fluid can be well mixed in each unit.

[0062] It is understandable that the plurality of first mixing bodies 11 may be provided as two, three, four or more, which is not particularly limited herein.

[0063] In order to protect the first mixing body 11 , in one embodiment, a shell may be disposed outside the first mixing body 11 for protection, or a shell may be disposed on a plurality of first mixing bodies 11 for protection.

[0064] In one embodiment, the combustion-supporting gas input pipe 12 is provided with a plurality of first branch pipes 16 , and a plurality of the combustion-supporting gas inlets are connected to the combustion-supporting gas input pipe 12 through the first branch pipes 16 .

[0065] By configuring in this way, the supporting gas can be evenly dispersed in each supporting gas inlet by using a plurality of first branch pipes 16 connected to the supporting gas input pipe 12 .

[0066] In one embodiment, the combustible gas input pipe 13 is provided with a plurality of second branch pipes 17 , and the plurality of combustible gas inlets are connected to the combustible gas input pipe 13 through the second branch pipes 17 .

[0067] In this configuration, by using a plurality of second branch pipes 17 connected to the combustible gas inlet pipe 13, the combustible gas can be evenly dispersed in each combustible gas inlet port.

[0068] In summary, the first branch pipe 16 and the second branch pipe 17 can ensure uniformity of gas components in each mixing channel 111 .

[0069] It is understandable that the gas flow of each air inlet (combustible gas inlet and combustible gas inlet) can be individually adjusted through multiple branch pipes (first branch pipe 16 or second branch pipe 17), which increases the flexibility of adjusting the gas composition ratio in the mixing channel.

[0070] In one embodiment, the mixed gas output pipe 14 is provided with a plurality of third branch pipes 18 , and a plurality of the mixed gas outlets are connected to the mixed gas output pipe 14 through the third branch pipes 18 .

[0071] With such arrangement, by using a plurality of third branch pipes 18 connected to the mixed gas output pipe 14, a plurality of air flows from the mixed gas output ports 212 can be gathered, thereby facilitating the delivery to the low-nitrogen burner for combustion.

[0072] In one embodiment, the premixing device 100 further includes a second mixing assembly 2, which includes a second mixing body 21 and a stirring member 22. The second mixing body 21 includes an inlet 211, an outlet 212, and a mixing chamber 213 connecting the inlet 211 and the outlet 212, and the inlet 211 is connected to the mixed gas output pipe 14. The stirring member 22 is movably disposed in the mixing chamber 213 to stir the gas in the mixing chamber 213.

[0073] With such arrangement, the gas in the mixing chamber 213 can be actively stirred by the stirring member 22 instead of relying solely on the natural diffusion of the gas, thereby further improving the mixing efficiency.

[0074] It is understandable that the stirring member 22 can be arranged in the mixing chamber 213 by rotating, swinging, and telescoping.

[0075] It should be noted here that, since different combustible gases and combustion-supporting gases have different molecular weights and their proportions and physical states after mixing are different, their densities after mixing may be greater than or less than.

[0076] When the density of the mixed gas is less than the density of air, in one embodiment, the inlet 211 has a first installation height H1, the outlet 212 has a second installation height H2, and the stirring member 22 has a third installation height H3, wherein H1>H3>H2;

[0077] By configuring in this way, after the mixed gas enters the mixing chamber 213 , it contacts the stirring element 22 before leaving from the outlet 212 .

[0078] When the density of the mixed gas is greater than the density of air, in one embodiment, the inlet 211 has a first installation height H1, the outlet 212 has a second installation height H2, and the stirring member 22 has a third installation height H3, wherein H2>H3>H1.

[0079] By configuring in this way, after the mixed gas enters the mixing chamber 213 , it contacts the stirring element 22 before leaving from the outlet 212 .

[0080] It is worth noting that when the density of the mixed gas is equal to the density of air, any of the above settings can be adopted.

[0081] In one embodiment, a filter 3 is provided between the combustion-supporting gas input pipe 12 and the combustion-supporting gas inlet port to filter impurities in the combustion-supporting gas.

[0082] In this way, the filter 3 intercepts impurities such as solid particles and oil droplets in the combustion gas to prevent them from entering the combustion system, thereby ensuring the purity of the combustion gas, reducing unnecessary by-products in the combustion process, and improving the combustion efficiency. At the same time, it reduces the wear and blockage of the nozzle, combustion chamber and other key components, and prolongs the service life of the equipment.

[0083] In one embodiment, a filter 3 is provided between the combustible gas input pipe 13 and the combustible gas inlet for filtering impurities in the combustible gas.

[0084] In this way, the filter 3 intercepts impurities such as solid particles and oil droplets in the combustible gas to prevent them from entering the combustion system, thereby ensuring the purity of the combustible gas, reducing unnecessary by-products in the combustion process, and improving the combustion efficiency. At the same time, it reduces the wear and blockage of the nozzle, combustion chamber and other key components, and prolongs the service life of the equipment.

[0085] It is understandable that the filter element 3 can be configured as a filter net or filter cotton.

[0086] In one embodiment, a sealing member 4 is provided on the outer peripheral side of the filter member 3 .

[0087] In this configuration, the outer peripheral side of the filter element 3 is sealed by the sealing element 4, thereby improving the overall sealing effect.

[0088] It is understandable that the sealing member 4 may be a sealing ring or a structural adhesive.

[0089] It can be understood that, taking the main gas-supporting gas input pipe (the main gas-supporting gas input pipe can also be provided in the same manner) as an example, the main gas-supporting gas input pipe is provided with a detachably connected first fixing plate 5 and a second fixing plate 6, and a first groove 7 is provided at abutment between at least one of the first fixing plate 5 and the second fixing plate 6 and the filter element 3. In this way, the first groove 7 makes the installation of the filter element 3 more stable.

[0090] It is understandable that a second groove 8 is provided at the contact point between at least one of the first fixing plate 5 and the second fixing plate 6 and the sealing member 4. The second groove 8 makes the installation of the sealing member 4 more stable.

[0091] The present invention also proposes a low-nitrogen burner, which includes a premixing device 100. The specific structure of the premixing device 100 refers to the above embodiment. Since the low-nitrogen burner adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0092] The present invention also proposes a gas device, which includes a low-nitrogen burner. The specific structure of the low-nitrogen burner refers to the above-mentioned embodiment. Since the gas device adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0093] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A premixing device, characterized in that: include: A first mixing assembly, comprising at least one first mixing body, a combustion-supporting gas inlet pipe, a combustible gas inlet pipe and a mixed gas outlet pipe, wherein the first mixing body is provided with a combustion-supporting gas inlet, a combustible gas inlet, a mixed gas outlet and a mixed flow channel, wherein the mixed flow channel connects the combustion-supporting gas inlet and the combustible gas inlet with the mixed gas outlet; and A spoiler, disposed in the mixed flow channel, for extending the flow path of the airflow in the mixed flow channel; The combustion-supporting gas input pipe is connected to the combustion-supporting gas inlet, the combustible gas input pipe is connected to the combustible gas inlet, and the mixed gas input pipe is connected to the mixed gas outlet.

2. The premixing device according to claim 1, characterized in that The spoiler is arranged in a curved manner.

3. The premixing device according to claim 2, characterized in that The spoiler is spirally arranged along the length direction of the mixed flow channel.

4. The premixing device according to claim 1, characterized in that The first mixing bodies are provided in plurality, and the plurality of the first mixing bodies are arranged in parallel.

5. The premixing device according to claim 4, characterized in that The combustion-supporting gas input pipe is provided with a plurality of first branch pipes, and the plurality of combustion-supporting gas inlets are connected to the combustion-supporting gas input pipe through the first branch pipes; and / or, The combustible gas input pipe is provided with a plurality of second branch pipes, and the plurality of combustible gas inlets are connected to the combustible gas input pipe through the second branch pipes; and / or, The mixed gas output pipe is provided with a plurality of third branch pipes, and a plurality of the mixed gas outlets are connected with the mixed gas output pipe through the third branch pipes.

6. The premixing device according to claims 1 to 5, characterized in that The premixing device also includes: A second mixing assembly includes a second mixing body, the second mixing body includes an inlet, an outlet, and a mixing chamber communicating with the inlet and the outlet, the inlet is connected to the mixed gas output pipe; and A stirring member is movably arranged in the mixing chamber and is used for stirring the gas in the mixing chamber.

7. The premixing device according to claim 6, characterized in that The inlet has a first installation height H1, the outlet has a second installation height H2, and the stirring member has a third installation height H3; Wherein, H1>H3>H2; Alternatively, H2>H3>H1.

8. The premixing device according to claim 6, characterized in that A filter is provided between the combustion-supporting gas input pipe and the combustion-supporting gas inlet for filtering impurities in the combustion-supporting gas; and / or, A filter is provided between the combustible gas input pipe and the combustible gas inlet for filtering impurities in the combustible gas.

9. A low nitrogen burner, characterized in that: Comprising a premixing device as claimed in any one of claims 1 to 8.

10. A gas equipment, characterized in that: Comprising a low nitrogen burner as described in any one of claim 9.

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