Premixing device, low-nitrogen burner and fuel gas equipment

Abstract

The utility model discloses a premixing device, low nitrogen burner and gas equipment, relates to combustion equipment technical field, wherein the premixing device comprises a first mixing assembly and a spoiler, the first mixing assembly comprises at least one first mixing main 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 utility model, 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 utility model relates to combustion equipment technical field, especially low nitrogen combustor and gas equipment of premixing device. BACKGROUND

[0002] Low nitrogen combustor is the important equipment on industrial fuel oil boiler, gas boiler, it guarantees the process such as fuel stable ignition combustion and fuel complete combustion, low nitrogen combustor will cause combustion to be insufficient when burning due to high gas concentration, need first use premixing device and burn after combustible gas and air are mixed evenly, make its combustion more sufficient and stable. Premixing device is not enough uniform in prior art, will lead to the influence to combustion. SUMMARY

[0003] The utility model discloses a premixing device, low nitrogen combustor and gas equipment, aims at making premixing device burn after combustible gas and combustion-supporting gas are mixed evenly, improves the stability of combustion.

[0004] To realize above-mentioned purpose, the utility model discloses a premixing device, including:

[0005] First mixed component, including at least one first mixed main body, and combustion-supporting gas input pipe, and combustible gas input pipe and mixed gas output pipe, the first mixed main body is provided with combustion-supporting gas inlet, combustible gas inlet, mixed gas outlet and mixed flow channel, the mixed flow channel is communicated with the mixed gas outlet with combustion-supporting gas inlet and combustible gas inlet, and,

[0006] Turbulence piece is set up in the mixed flow channel, to lengthen the flow path of airflow in the mixed flow channel,

[0007] Wherein, the combustion-supporting gas input pipe is docked with the combustion-supporting gas inlet, the combustible gas input pipe is docked with the combustible gas inlet, and the mixed gas input pipe is docked with the mixed gas outlet.

[0008] In an embodiment, the turbulence piece is curvedly arranged.

[0009] In an embodiment, the turbulence piece is helically arranged along the length direction of the mixed flow channel.

[0010] In an embodiment, the first mixed main body is arranged in plurality, and the plurality of first mixed main bodies are arranged in parallel.

[0011] In an 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 communicated with 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 the plurality of mixed gas outlets are communicated 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 being 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 member 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 oxidant gas input pipe and the oxidant gas inlet for filtering impurities in the oxidant 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 includes at least one first mixing body, a oxidizing gas inlet pipe, a combustible gas inlet pipe, and a mixed gas outlet pipe, wherein the first mixing body is provided with an oxidizing gas inlet, a combustible gas inlet, a mixed gas outlet, and a mixing channel, wherein the mixing channel connects the oxidizing 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] The oxidizing gas input pipe is connected to the oxidizing 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 includes at least one first mixing body, a oxidizing gas inlet pipe, a combustible gas inlet pipe, and a mixed gas outlet pipe, wherein the first mixing body is provided with an oxidizing gas inlet, a combustible gas inlet, a mixed gas outlet, and a mixing channel, wherein the mixing channel connects the oxidizing 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 oxidizing gas input pipe is connected to the oxidizing 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 can mix the combustible gas and the supporting gas evenly and then burn 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 following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 any creative work.

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

[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 This 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. Mixing channel; 12. Combustible gas inlet pipe; 13. Combustible gas inlet pipe; 14. Mixed gas outlet pipe; 15. Flow 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. First fixed plate;

[0043] 6. Second fixed plate;

[0044] 7. First groove;

[0045] 8. 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 embodiments described 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 making creative efforts shall fall 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 indications 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 for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. 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 mutually contradictory or cannot be implemented, it should be deemed that such a 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 crucial components of industrial oil and gas boilers, ensuring stable ignition and complete combustion of the fuel. However, due to the high concentration of the fuel gas, low-nitrogen burners can cause incomplete combustion. Therefore, a premixing device is required to evenly mix the fuel gas and air prior to combustion, ensuring more complete and stable combustion. Existing premixing devices often fail to achieve uniform mixing, which can affect combustion.

[0051] In order to solve the above technical problems, Figures 1 to 3 As shown, the present invention proposes a premixing device 100, comprising a first mixing assembly 1 and a spoiler 15. The first mixing assembly 1 comprises at least one first mixing body 11, a oxidizing 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 an oxidizing gas inlet, a combustible gas inlet, a mixed gas outlet, and a mixing channel 111. The mixing channel 111 connects the oxidizing gas inlet and the combustible gas inlet to the mixed gas outlet. The spoiler 15 is disposed within the mixing channel 111 to extend the flow path of the airflow within the mixing channel 111. The oxidizing gas inlet pipe 12 is connected to the oxidizing 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 can mix the combustible gas and the supporting gas evenly and then burn 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. 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 motion between the airflows, it also promotes the exchange of matter and energy between different airflows (in this article, referring to 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 mutual diffusion of the airflow will be improved 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's important to note that "diffusion" in physics refers to the spontaneous migration of gases from areas of high concentration to areas of low concentration. In this context, "diffusion" refers to the spontaneous migration of high-concentration combustible gas and high-concentration oxidant gas due to their different concentrations when they come into contact, resulting in the gases gradually becoming more uniform during their contact.

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

[0057] Such a setting changes the state of the airflow in the fluid flow direction through the curved shape, increases the shear force between airflow layers, helps to break the laminar state of the airflow, forms vortices and promotes mixing.

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

[0059] With such an arrangement, the spiral spoiler 15 generates vortices 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 manner, by arranging multiple first mixing bodies 11 in parallel, the cross-sectional area of ​​the mixing channel can be increased, providing more contact surfaces, thereby ensuring more complete contact between airflows and improving mixing efficiency. Furthermore, since each mixing body has an independent spoiler 15 or other premixing device 100, the parallel arrangement can also ensure that the fluid is well mixed in each unit.

[0062] It is understandable that the plurality of first mixing bodies 11 can be set to two, three, four or more, which is not particularly limited here.

[0063] In order to protect the first mixing body 11 , in one embodiment, a shell may be provided outside the first mixing body 11 for protection, or shells may be provided outside the first mixing body 11 for protection.

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

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

[0066] In one embodiment, the combustible gas inlet 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 inlet 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 distributed in each combustible gas inlet.

[0068] In summary, the first branch pipe 16 and the second branch pipe 17 can ensure uniformity of the gas composition 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 branches (first branch 16 or second branch 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 the plurality of mixed gas outlets are connected to the mixed gas output pipe 14 through the third branch pipes 18 .

[0071] With such an arrangement, by using a plurality of third branch pipes 18 to be 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 of the mixed gas 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 communicating with the inlet 211 and the outlet 212. 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 an 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 supporting gases have different molecular weights and different ratios and physical states after mixing, the density of the mixed gases may be greater or less than one another.

[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] With such an arrangement, the mixed gas, after entering the mixing chamber 213 , 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] With such an arrangement, the mixed gas, after entering the mixing chamber 213 , 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 supporting fuel gas input pipe 12 and the supporting fuel gas inlet for filtering impurities in the supporting fuel gas.

[0082] This arrangement allows the filter element 3 to intercept impurities such as solid particles and oil droplets in the combustion gas, preventing them from entering the combustion system. This ensures the purity of the combustion gas, reduces unnecessary byproducts during the combustion process, and improves combustion efficiency. It also reduces wear and clogging of the nozzle, combustion chamber, and other key components, extending the service life of the equipment.

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

[0084] This arrangement allows the filter element 3 to intercept impurities such as solid particles and oil droplets in the combustible gas, preventing them from entering the combustion system. This ensures the purity of the combustible gas, reduces unnecessary byproducts during the combustion process, and improves combustion efficiency. It also reduces wear and clogging of the nozzle, combustion chamber, and other key components, extending the service life of the equipment.

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

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

[0087] With this arrangement, 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 structural adhesive.

[0089] It is understood that, taking the main supporting gas inlet pipe (which can also be provided in the same manner) as an example, the main supporting gas inlet pipe is provided with a detachably connected first fixing plate 5 and a second fixing plate 6, and a first groove 7 is formed at the point where at least one of the first fixing plate 5 and the second fixing plate 6 abuts against the filter element 3. This arrangement, through the first groove 7, makes the installation of the filter element 3 more stable.

[0090] It is understandable that a second groove 8 is formed 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 present 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 utility model 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 described one by one here.

[0093] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect application 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 includes at least one first mixing body, a oxidizing gas inlet pipe, a combustible gas inlet pipe, and a mixed gas outlet pipe, wherein the first mixing body is provided with an oxidizing gas inlet, a combustible gas inlet, a mixed gas outlet, and a mixing channel, wherein the mixing channel connects the oxidizing 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 oxidizing gas input pipe is connected to the oxidizing 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 first mixing bodies are arranged in parallel.

5. The premixing device according to claim 4, characterized in that The supporting fuel gas input pipe is provided with a plurality of first branch pipes, and the plurality of supporting fuel gas inlets are connected to the supporting fuel 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 the plurality of mixed gas outlets are communicated 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 being 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 the premixing device according to 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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