Internal circulation ultra-low nitrogen burner

Abstract

The utility model relates to the technical field of low-nitrogen combustors, and discloses an internal circulation ultra-low-nitrogen combustor which comprises a mixing section assembly, a fuel gas inlet assembly, a fuel gas center pipe assembly, a center air duct assembly, a fire gathering cover assembly, a peripheral spray head assembly, a center pipe fixing ejector rod and an ignition needle. The mixing section assembly comprises a fan connecting flange used for being connected with an air supply channel, the inner wall of the fan connecting flange is fixedly connected with a mixing section, the rear end of the mixing section is fixedly connected with a mounting flange, the rear end of the mounting flange is fixedly connected with an air channel front section, and the rear end of the air channel front section is fixedly connected with an air channel contraction section. According to the utility model, the combustion is more stable by using a step-by-step ignition combustion mode, flames are more stable by adopting a central rotational flow structure, the generation of nitrogen oxides is reduced by staged combustion, the generation of nitrogen oxides is reduced by internal circulation of flue gas, and the generation of nitrogen oxides is reduced by rich-lean combustion; and it is ensured that the combustor can operate stably while the emission of nitric oxide is low.

Description

TECHNICAL FIELD

[0001] The utility model relates to low nitrogen combustor technical field especially relates to a kind of inner circulation ultra-low nitrogen combustor. BACKGROUND

[0002] Combustor is the important component of industrial boiler, has the function of releasing fuel energy as heat energy, while also generating flue gas pollutants, with the improvement of environmental protection requirement, low nitrogen gas combustor application is also widely followed, under the promotion of national policy, nitrogen oxides emission, it is important index of design combustor.

[0003] But the principle of low nitrogen, it is to make combustion organization unstable to reduce flame temperature, so as to lead to in guaranteeing low nitrogen of combustor while making combustion unstable, so design a kind of can guarantee the full combustion of fuel, guarantee the stable, safe operation of combustor, and the nitrogen oxides emission is lower combustor, it is the problem that designer needs to solve. UTILITY MODEL CONTENT

[0004] The utility model aims at solving the shortcomings in the prior art and provides an inner circulation ultra-low nitrogen combustor, uses step-by-step pilot combustion mode to make combustion more stable, adopts center cyclone structure to make flame more stable, and the generation of nitrogen oxides is reduced by staged combustion, flue gas internal circulation reduces the generation of nitrogen oxides, and dense and thin combustion reduces the generation of nitrogen oxides.

[0005] To achieve the above object, the utility model provides the following technical scheme:

[0006] An inner circulation ultra-low nitrogen combustor, comprising a mixing section assembly, a gas inlet assembly, a gas center pipe assembly, a center air cylinder assembly, a fire cover assembly, a peripheral nozzle assembly, a center pipe fixing top rod and an ignition needle.

[0007] The mixing section assembly includes a fan connection flange for connecting the air supply channel, the inner wall of the fan connection flange is fixedly connected with a mixing section, the rear end of the mixing section is fixedly connected with a mounting flange, the rear end of the mounting flange is fixedly connected with an air passage front section, the rear end of the air passage front section is fixedly connected with an air passage contraction section, and the rear end of the air passage contraction section is fixedly connected with an air passage rear section.

[0008] The mixing section top is provided with a top rod fixing seat, the mixing section bottom is provided with a center tube fixing seat, the mixing section inner wall is provided with a gas cavity, the gas cavity rear end is fixedly connected with the front end of the mounting flange, the mounting flange rear end is provided with a plurality of peripheral gas branch pipes, the peripheral gas branch pipe outer wall middle part is penetrated in the air passage contraction section rear end, the peripheral gas branch pipe outer wall rear side is fixedly connected with the fire screen fixing seat, the peripheral gas branch pipe rear end is fixedly connected with the nozzle fixing seat, the gas inlet assembly is arranged on the left end of the mixing section, the gas center tube assembly is arranged on the top end of the center tube fixing seat, the fire screen assembly is arranged on the outer wall of the fire screen fixing seat, and the peripheral nozzle assembly is arranged on the inner wall of the nozzle fixing seat.

[0009] Further, the gas inlet assembly includes a peripheral gas passage provided on the left end of the mixing section, and the peripheral gas passage bottom is fixedly connected with an inlet passage.

[0010] Further, the gas center tube assembly includes a main pipe inlet fixedly connected on the top end of the center tube fixing seat, the main pipe inlet top is fixedly connected with a main pipe fixing seat, the main pipe inlet rear end is provided with a center gas main pipe, the center gas main pipe outer wall left side is fixedly connected with an ignition needle fixing seat, the center gas main pipe outer wall lower side is fixedly connected with two center tube support rods, the two center tube support rods bottom are fixedly connected with support rod pulleys, the center gas main pipe outer wall rear side is provided with a plurality of intermediate level gas branch pipes, the intermediate level gas branch pipe outer wall is provided with an intermediate level gas nozzle, the center gas main pipe outer wall rear side is provided with a plurality of center nozzles corresponding to the intermediate level gas branch pipe rear side, and the center air cylinder assembly is arranged on the center gas main pipe outer wall rear side.

[0011] Further, the center air cylinder assembly includes a flame stabilizing disc fixedly connected on the center gas main pipe outer wall rear side, the intermediate level gas branch pipe is penetrated in the rear end of the flame stabilizing disc, the flame stabilizing disc rear end is provided with a plurality of spiral flow pieces, the flame stabilizing disc rear end is provided with a plurality of flame disc air holes, the flame stabilizing disc outer wall is fixedly connected with a center air cylinder, the center air cylinder front end is fixedly connected with a center air cylinder contraction port, and the center air cylinder rear end is fixedly connected with a flame stabilizing ring.

[0012] Further, the main pipe fixing seat inner wall is provided with a center tube fixing top rod, the center tube fixing top rod outer wall is screw connected in the inner wall of the top rod fixing seat, the ignition needle fixing seat rear end is fixedly connected with an ignition needle, and the ignition needle outer wall is penetrated in the rear end of the flame stabilizing ring.

[0013] Further, the fire gathering cover assembly comprises a fire gathering cover arranged on the outer wall of the fire gathering cover fixing base, a plurality of fire gathering cover fixing holes are formed in the outer wall of the fire gathering cover fixing base, and a fixing bolt is arranged on the inner wall of each fire gathering cover fixing hole.

[0014] Further, the peripheral spray head assembly comprises a spray head threadedly connected to the inner wall of the spray head fixing base, and a plurality of inward spray holes are formed in the inward side of the spray head, and a plurality of outward spray holes are formed in the outward side of the spray head.

[0015] The utility model has the advantages of the following beneficial effects:

[0016] 1. The combustion mode of step-by-step ignition is used in the utility model to make the combustion more stable, the central rotational flow structure is adopted to make the flame more stable, the generation of nitrogen oxides is reduced by the step combustion, the generation of nitrogen oxides is reduced by the internal circulation of flue gas, the generation of nitrogen oxides is reduced by the thick-thin combustion, and the burner can be stably operated while the emission of nitrogen oxides is low. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the three-dimensional structure schematic diagram of the utility model;

[0018] Figure 2 It is Figure 1 the sectional view of

[0019] Figure 3 It is the structure drawing of the mixing section assembly;

[0020] Figure 4 It is the sectional view of Figure 3

[0021] Figure 5

[0022] Figure 6 It is the structure drawing of the central air duct assembly;

[0023] Figure 7 It is the structure drawing of the fire gathering cover assembly;

[0024] Figure 8 It is the structure drawing of the peripheral spray head assembly.

[0025] LEGEND:

[0026] ​​1, mixed section assembly; 1-1, fan connection flange; 1-2, mixed section; 1-3, gas cavity; 1-4, mounting flange; 1-5, air passage front section; 1-6, air passage contraction section; 1-7, air passage rear section; 1-8, peripheral gas branch pipe; 1-9, fire cover fixing seat; 1-10, nozzle fixing seat; 1-11, top rod fixing seat; 1-12, center tube fixing seat;

[0027] 2, gas inlet assembly; 2-1, inlet passage; 2-2, peripheral gas passage; 2-3, central gas passage;

[0028] 3, gas center tube assembly; 3-1, main pipe inlet; 3-2, main pipe fixing seat; 3-3, central gas main pipe; 3-4, ignition needle fixing seat; 3-5, center tube support rod; 3-6, support rod pulley; 3-7, intermediate stage gas branch pipe; 3-8, intermediate stage gas injection hole; 3-9, central injection hole;

[0029] 4, center air cylinder assembly; 4-1, center air cylinder contraction; 4-2, center air cylinder; 4-3, flame stabilizing disc; 4-4, cyclone sheet; 4-5, flame stabilizing disc air hole; 4-6, flame stabilizing ring;

[0030] 5, fire cover assembly; 5-1, fire cover; 5-2, notch; 5-3, fire cover fixing hole;

[0031] 6, peripheral nozzle assembly; 6-1, nozzle; 6-2, inward injection hole; 6-3, outward injection hole;

[0032] 7, center tube fixed top rod; 8, ignition needle. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to 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 the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0034] An embodiment provided by the utility model: an internal circulation ultra-low nitrogen combustor, comprising a mixed section assembly 1, a gas inlet assembly 2, a gas center tube assembly 3, a center air cylinder assembly 4, a fire cover assembly 5, a peripheral nozzle assembly 6, a center tube fixed top rod 7 and an ignition needle 8.

[0035] Refer to Figures 1-3The mixing section assembly 1 comprises a fan connecting flange 1-1 for connecting the air supply channel, a mixing section 1-2 fixedly connected to the inner wall of the fan connecting flange 1-1, an installation flange 1-4 fixedly connected to the rear end of the mixing section 1-2, an air channel front section 1-5 fixedly connected to the rear end of the installation flange 1-4, an air channel contraction section 1-6 fixedly connected to the rear end of the air channel front section 1-5, and an air channel rear section 1-7 fixedly connected to the rear end of the air channel contraction section 1-6;

[0036] With reference to Figures 2-4 The mixing section 1-2 is provided with a top rod fixing seat 1-11 at the top end and a center pipe fixing seat 1-12 at the bottom end, and is provided with a gas cavity 1-3 on the inner wall. The gas cavity 1-3 is fixedly connected to the front end of the installation flange 1-4 at the rear end. The installation flange 1-4 is provided with a plurality of peripheral gas branch pipes 1-8 penetrating the rear end of the air channel contraction section 1-6. The outer wall of each peripheral gas branch pipe 1-8 is fixedly connected to a flame hood fixing seat 1-9 at the rear side, and is fixedly connected to a spray head fixing seat 1-10 at the rear end. The gas inlet assembly 2 is arranged at the left end of the mixing section 1-2. The gas inlet assembly 2 comprises a peripheral gas channel 2-2 penetrating the left end of the mixing section 1-2, and an inlet channel 2-1 fixedly connected to the bottom end of the peripheral gas channel 2-2. The peripheral gas channel 2-2 is used to communicate the inlet channel 2-1 with the gas cavity 1-3. The peripheral gas channel 2-2 is provided with a center gas channel 2-3 penetrating the front end, and the other end of the center gas channel 2-3 is fixedly connected to the bottom end of the center pipe fixing seat 1-12.

[0037] With reference to Figure 2 、 Figure 5 and Figure 6, the gas center pipe assembly 3 is arranged at the top end of the center pipe fixing seat 1-12, the gas center pipe assembly 3 comprises a main pipe inlet 3-1 fixedly connected at the top end of the center pipe fixing seat 1-12, a main pipe fixing seat 3-2 fixedly connected at the top end of the main pipe inlet 3-1, a center gas main pipe 3-3 penetratingly arranged at the rear end of the main pipe inlet 3-1, a spark needle fixing seat 3-4 fixedly connected at the left side of the outer wall of the center gas main pipe 3-3, two center pipe support rods 3-5 fixedly connected at the lower side of the outer wall of the center gas main pipe 3-3, support rod pulleys 3-6 fixedly connected at the bottom ends of the two center pipe support rods 3-5, a plurality of intermediate level gas branch pipes 3-7 penetratingly arranged at the rear side of the outer wall of the center gas main pipe 3-3, intermediate level gas injection holes 3-8 formed at the outer walls of the intermediate level gas branch pipes 3-7, a plurality of center injection holes 3-9 formed at the rear side of the outer wall of the center gas main pipe 3-3 corresponding to the rear side of the intermediate level gas branch pipes 3-7, and a center air cylinder assembly 4 arranged at the rear side of the outer wall of the center gas main pipe 3-3, the center air cylinder assembly 4 comprising a flame stabilizing disc 4-3 fixedly connected at the rear side of the outer wall of the center gas main pipe 3-3, the intermediate level gas branch pipes 3-7 penetratingly arranged at the rear end of the flame stabilizing disc 4-3, a plurality of rotating flow plates 4-4 formed at the rear end of the flame stabilizing disc 4-3, a plurality of flame disc air holes 4-5 formed at the rear end of the flame stabilizing disc 4-3, a center air cylinder 4-2 fixedly connected at the outer wall of the flame stabilizing disc 4-3, a center air cylinder contraction opening 4-1 fixedly connected at the front end of the center air cylinder 4-2, a flame stabilizing ring 4-6 fixedly connected at the rear end of the center air cylinder 4-2, a center pipe fixing top rod 7 arranged at the inner wall of the main pipe fixing seat 3-2, the center pipe fixing top rod 7 threadedly connected at the inner wall of the top rod fixing seat 1-11, a spark needle 8 fixedly connected at the rear end of the spark needle fixing seat 3-4, the spark needle 8 penetratingly arranged at the rear end of the flame stabilizing ring 4-6, and a fire cover assembly 5 arranged at the outer wall of the fire cover fixing seat 1-9,

[0038] Referring to Figure 1 , Figure 7 and Figure 8 , the fire cover assembly 5 comprises a fire cover 5-1 arranged at the outer wall of the fire cover fixing seat 1-9, a plurality of fire cover fixing holes 5-3 formed at the outer wall of the fire cover 5-1, a fixing bolt arranged at the inner wall of each of the fire cover fixing holes 5-3, the fixing bolt being used for mounting the fire cover 5-1 at the outer wall of the fire cover fixing seat 1-9 through the fire cover fixing holes 5-3, a plurality of notches 5-2 formed at the rear end of the fire cover 5-1, an outer peripheral spray head assembly 6 arranged at the inner wall of the spray head fixing seat 1-10, the outer peripheral spray head assembly 6 comprising a spray head 6-1 threadedly connected at the inner wall of the spray head fixing seat 1-10, a plurality of inward spray holes 6-2 formed at the inward side of the spray head 6-1, and a plurality of outward spray holes 6-3 formed at the outward side of the spray head 6-1.

[0039] As a technical optimization scheme of the utility model, the peripheral gas branch pipe 1-8 is 4-12, the intermediate level gas branch pipe 3-7 is 4-12, the intermediate level gas injection hole 3-8 on each intermediate level gas branch pipe 3-7 is 1-5, the center injection hole 3-9 is 4-12, the inward injection hole 6-2 is 1-3, the outward injection hole 6-3 is 1-2, and the cyclone piece 4-4 is 4-12.

[0040] Working principle: combustion-supporting wind enters through the fan connecting flange 1-1, flows downwards through the mixing section 1-2, the inner side of the gas cavity 1-3, the mounting flange 1-4, the air passage front section 1-5, the air passage contraction section 1-6, and then enters the air passage rear section 1-7, and is divided into two parts in front of the center air cylinder contraction 4-1, the first part flows out from the passage between the center air cylinder contraction 4-1 and the air passage rear section 1-7, under the inclined action of the center air cylinder contraction 4-1, the passage area becomes smaller, so that the flow rate of the combustion-supporting wind increases, and then the combustion-supporting wind flows out from the end of the air passage rear section 1-7 into the mixed gas passage formed by the center air cylinder 4-2 and the flame hood 5-1, due to the high-speed effect in the passage, a low-pressure area is formed in the passage, the peripheral flue gas is sucked into the mixed gas passage through the annular passage formed by the air passage rear section 1-7 and the flame hood 5-1, and is mixed with the first part of the combustion-supporting wind to form mixed gas, and the peripheral mixed combustion-supporting wind is formed by the backward flow; the second part flows through the inside of the center air cylinder contraction 4-1 and then flows in front of the flame stabilizing disc 4-3, and is again divided into two parts, one part flows out from the flame disc air hole 4-5 to form center straight-flow combustion-supporting wind; and the other part flows out from the cyclone piece 4-4 to form intermediate cyclone combustion-supporting wind.

[0041] After the gas enters the air inlet passage 2-1, it is divided into two parts, the first part flows into the center gas passage 2-3, and then flows through the center pipe fixing seat 1-12, the main pipe inlet 3-1, and the center gas main pipe 3-3, and is divided into two parts at the middle rear section of the center gas main pipe 3-3 to continue to develop backward, and is sprayed out from the center injection hole 3-9 at the end of the center gas main pipe 3-3 to be mixed with the center straight-flow combustion-supporting wind, is ignited by the ignition needle 8, and forms a center flame; the other part flows through each intermediate level gas branch pipe 3-7, is sprayed out from the intermediate level gas injection hole 3-8 at the end, is mixed with the intermediate cyclone combustion-supporting wind, is ignited by the center flame, and forms an intermediate level strong cyclone flame; the second part flows through the peripheral gas passage 2-2, enters the closed gas cavity formed by the mixing section 1-2, the gas cavity 1-3, and the mounting flange 1-4, is divided into several parts at the end of the gas cavity, enters each peripheral gas branch pipe 1-8, develops backward, and is divided into two parts in the peripheral nozzle assembly 6, one part is sprayed out from the inward injection hole 6-2 to be mixed with part of the peripheral mixed combustion-supporting wind, is ignited by the intermediate level strong cyclone flame, and forms a peripheral inner side flame; and the other part is mixed with part of the peripheral mixed combustion-supporting wind after being sprayed out from the outward injection hole 6-3, is ignited by the peripheral inner side flame, and forms a peripheral outer side flame.

[0042] Each peripheral nozzle assembly 6 can rotate an angle, so that the peripheral flame forms a swirl, so that the combustion is more stable. Under the action of a plurality of gaps 5-2 on the fire screen assembly 5, the flame is more dispersed, the flame temperature can be reduced to reduce the effect of nitrogen oxides, and under the action of internal circulation, the flue gas is sucked to further reduce the combustion temperature, and the nitrogen oxides are further reduced. In this way, by means of step-by-step ignition, the utility model can reduce nitrogen oxides while stabilizing combustion.

[0043] Finally, it should be noted that: the above only for the preferred embodiments of the utility model, and not for limiting the utility model, although the utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it still can modify the technical scheme recorded in the foregoing each embodiment, or equivalent replacement to part of the technical features, any modification, equivalent replacement, improvement, etc. within the spirit and principles of the utility model, should be included in the protection scope of the utility model.

Claims

1. An internally recirculating ultra-low nitrogen burner characterized by, The application relates to a gas combustion device, which comprises a mixing section assembly (1), a gas inlet assembly (2), a gas center pipe assembly (3), a center air duct assembly (4), a fire cover assembly (5), a peripheral nozzle assembly (6), a center pipe fixing top rod (7) and an ignition needle (8). The mixing section assembly (1) comprises a fan connecting flange (1-1) for connecting a wind supply channel, a mixing section (1-2) fixedly connected to the inner wall of the fan connecting flange (1-1), an installation flange (1-4) fixedly connected to the rear end of the mixing section (1-2), an air channel front section (1-5) fixedly connected to the rear end of the installation flange (1-4), an air channel contraction section (1-6) fixedly connected to the rear end of the air channel front section (1-5), and an air channel rear section (1-7) fixedly connected to the rear end of the air channel contraction section (1-6). The mixing section (1-2) is provided with a top rod fixing seat (1-11) at the top end, a center pipe fixing seat (1-12) at the bottom end, a gas cavity (1-3) in the inner wall, the gas cavity (1-3) being fixedly connected to the front end of the installation flange (1-4), a plurality of peripheral gas branch pipes (1-8) penetrating through the rear end of the air channel contraction section (1-6) and fixedly connected to the rear end of the installation flange (1-4), a fire cover fixing seat (1-9) fixedly connected to the rear side of the outer wall of each of the peripheral gas branch pipes (1-8), and a nozzle fixing seat (1-10) fixedly connected to the rear end of each of the peripheral gas branch pipes (1-8).

2. An internal-circulation ultra-low nitrogen burner according to claim 1, characterized in that: The gas inlet assembly (2) comprises a peripheral gas channel (2-2) penetrating through the left end of the mixing section (1-2), an air inlet channel (2-1) fixedly connected to the bottom end of the peripheral gas channel (2-2), and a center gas channel (2-3) penetrating through the front end of the peripheral gas channel (2-2) and fixedly connected to the bottom end of the center pipe fixing seat (1-12), wherein the peripheral gas channel (2-2) is used for connecting the air inlet channel (2-1) and the gas cavity (1-3).

3. An internal-circulation ultra-low nitrogen burner according to claim 1, characterized in that: The gas center pipe assembly (3) includes a main pipe inlet (3-1) fixedly connected at the top end of the center pipe fixing seat (1-12), the top end of the main pipe inlet (3-1) is fixedly connected with a main pipe fixing seat (3-2), the rear end of the main pipe inlet (3-1) is provided with a center gas main pipe (3-3), the left side of the outer wall of the center gas main pipe (3-3) is fixedly connected with a ignition needle fixing seat (3-4), the lower side of the outer wall of the center gas main pipe (3-3) is fixedly connected with two center pipe support rods (3-5), the bottom ends of the two center pipe support rods (3-5) are fixedly connected with support rod pulleys (3-6), the rear side of the outer wall of the center gas main pipe (3-3) is provided with a plurality of intermediate level gas branch pipes (3-7), the outer wall of the intermediate level gas branch pipe (3-7) is provided with an intermediate level gas injection hole (3-8), the rear side of the outer wall of the center gas main pipe (3-3) is provided with a plurality of center injection holes (3-9) corresponding to the rear side of the intermediate level gas branch pipe (3-7), and the center air cylinder assembly (4) is arranged on the rear side of the outer wall of the center gas main pipe (3-3).

4. An internally-circulating ultra-low nitrogen burner according to claim 3, wherein: The center air cylinder assembly (4) includes a flame stabilizing disc (4-3) fixedly connected on the rear side of the outer wall of the center gas main pipe (3-3), the intermediate level gas branch pipe (3-7) penetrates through the rear end of the flame stabilizing disc (4-3), the rear end of the flame stabilizing disc (4-3) is provided with a plurality of rotating flow plates (4-4), the rear end of the flame stabilizing disc (4-3) is provided with a plurality of flame disc air holes (4-5), the outer wall of the flame stabilizing disc (4-3) is fixedly connected with a center air cylinder (4-2), the front end of the center air cylinder is fixedly connected with a center air cylinder contraction opening (4-1), and the rear end of the center air cylinder (4-2) is fixedly connected with a flame stabilizing ring (4-6).

5. An internally-circulating ultra-low nitrogen burner according to claim 3, wherein: The inner wall of the main pipe fixing seat (3-2) is provided with a center pipe fixing top rod (7), the outer wall of the center pipe fixing top rod (7) is threadedly connected with the inner wall of a top rod fixing seat (1-11), the rear end of the ignition needle fixing seat (3-4) is fixedly connected with an ignition needle (8), and the outer wall of the ignition needle (8) penetrates through the rear end of the flame stabilizing ring (4-6).

6. An internally-circulating ultra-low nitrogen burner according to claim 1, wherein: The fire cover assembly (5) includes a fire cover (5-1) arranged on the outer wall of the fire cover fixing seat (1-9), the outer wall of the fire cover (5-1) is provided with a plurality of fire cover fixing holes (5-3), the inner wall of the fire cover fixing hole (5-3) is provided with a fixing bolt, the fixing bolt is used for mounting the fire cover (5-1) on the outer wall of the fire cover fixing seat (1-9) through the fire cover fixing hole (5-3), and the rear end of the fire cover (5-1) is provided with a plurality of notches (5-2).

7. An internally-circulating ultra-low nitrogen burner according to claim 1, wherein: The outer peripheral spray head assembly (6) includes a spray head (6-1) threadedly connected on the inner wall of the spray head fixing seat (1-10), the inward side of the spray head (6-1) is provided with a plurality of inward spray holes (6-2), and the outward side of the spray head (6-1) is provided with a plurality of outward spray holes (6-3).

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