Premixed environmentally friendly burner

Abstract

The present invention relates to a premixing environmentally friendly burner, comprising a burner housing, a permanent lamp, a primary small load back-mixing premixing spray gun, a secondary main load back-mixing premixing spray gun and a burner brick, wherein the small back-mixing premixing nozzle and the permanent lamp are distributed in the burner brick, the head of the secondary main load back-mixing premixing spray gun is provided with a main back-mixing premixing nozzle, and the main back-mixing premixing nozzle is distributed outside the burner brick, and the bottoms of the small back-mixing premixing nozzle and the main back-mixing premixing nozzle are both provided with a negative pressure area, and part of the air is sucked in and pre-mixed with the fuel gas. The present invention uses a primary small load back-mixing premixing spray gun to spray at the end of the burner brick, burns the burner brick red, and a high temperature portion of the burner brick exceeds 800°C appears, thereby stabilizing the combustion flame of the secondary main load back-mixing premixing spray gun; by using a back-mixing premixing nozzle, the combustible gas preferentially combines with oxygen in the air to react and burn, which can greatly curb the generation of NOx and CO.

Description

Technical Field

[0001] The invention relates to the technical field of combustion equipment, and in particular to a premixed environmentally friendly burner. Background Art

[0002] With the emergence of a large number of low-nitrogen burners, the effects of reducing NOx emissions vary. In order to reduce the generation of NOx, many of them deliberately reduce the oxygen content required for combustion, resulting in poor flame rigidity and weak combustion. Some flames float at the bottom of the furnace, and even a large amount of incomplete combustion products CO and unburned alkanes appear.

[0003] At present, both at home and abroad, when the furnace temperature is low (400℃-600℃), the CO in the flue gas will exceed the standard. However, with the continuous deepening of energy conservation and emission reduction work, under the premise of reducing NOx, CO must also be controlled within a certain small range to improve fuel utilization and achieve the energy conservation and consumption reduction goals of various enterprises. Summary of the invention

[0004] The purpose of the present invention is to overcome the above-mentioned shortcomings and provide a premixed environmentally friendly burner, which utilizes a primary small-load back-mixed premixed spray gun to spray at the end of the burner brick, burns the burner brick red, and a high-temperature portion of the burner brick exceeds 800°C, thereby stabilizing the combustion flame of the secondary main-load back-mixed premixed spray gun; using the back-mixed premixed nozzle, the combustible gas preferentially combines with oxygen in the air to react and burn, which can greatly curb the generation of NOx; at the same time, it makes the fuel gas easier to burn, generates a relatively high temperature around the flame, accelerates the combustion of the fuel gas, and makes the combustion flame relatively short.

[0005] The object of the present invention is achieved in that:

[0006] A premixing environmentally friendly burner comprises a burner shell, a permanent lamp, a primary small load back-mixing premixing spray gun, a secondary main load back-mixing premixing spray gun and a burner brick, wherein an air inlet is arranged on the side of the burner shell, a brick supporting plate is arranged on the upper part of the burner shell, and the burner brick is placed on the brick supporting plate, a small back-mixing premixing nozzle is arranged at the head of the primary small load back-mixing premixing spray gun, and the small back-mixing premixing nozzle and the permanent lamp are distributed in the burner brick, a main back-mixing premixing nozzle is arranged at the head of the secondary main load back-mixing premixing spray gun, and the main back-mixing premixing nozzle is distributed outside the burner brick, and negative pressure areas are arranged at the bottoms of the small back-mixing premixing nozzle and the main back-mixing premixing nozzle, so that part of the air is inhaled and pre-mixed with the fuel gas.

[0007] Preferably, the primary small-load back-mixing premixing spray gun includes a small air collecting pipe, a branch small air pipe, a small-load nozzle and a small back-mixing premixing nozzle; the secondary main-load back-mixing premixing spray gun includes a main air collecting pipe, a branch main air pipe, a main-load nozzle and a main back-mixing premixing nozzle.

[0008] Preferably, the burner brick is formed with a combustion channel area by the insulating bricks arranged at the bottom and the flue bricks arranged at the top, the primary small-load back-mixing premixing spray gun passes through the burner shell and the insulating bricks from bottom to top in sequence and enters the flue bricks, and the small back-mixing premixing nozzle located at the head is finally arranged in the flue bricks, the secondary main-load back-mixing premixing spray gun passes through the burner shell and the insulating bricks in sequence from bottom to top, the main back-mixing premixing nozzle located at the head extends from the insulating bricks, and the main back-mixing premixing nozzles are distributed outside the flue bricks.

[0009] Preferably, the small back-mixing premixing nozzle is integrally cast and includes a first nozzle, a first connecting block and a first fixing ear. The first nozzle and the first connecting block are spaced apart up and down, and a first nozzle accommodating cavity is formed between the bottom of the first nozzle and the first connecting block. Both ends of the first nozzle and the first connecting block are connected by the first fixing ear. The small-load nozzle enters the first nozzle accommodating cavity, and a gap is left between the small-load nozzle and the first nozzle, and the combustion-supporting air enters the first nozzle from the gap to be premixed with the fuel gas.

[0010] Preferably, a first guide block is provided on the top of the first nozzle, and the first nozzle is guided by the first guide block to spray the gas toward the burner brick.

[0011] Preferably, the main back-mixing premixing nozzle has the same structure as the small back-mixing premixing nozzle.

[0012] Preferably, high-pressure fuel gas above 0.05 MPa is sprayed at high speed from the small-load nozzle and the main-load nozzle, and a negative pressure area is formed around each nozzle, sucking in part of the air.

[0013] The beneficial effects of the present invention are:

[0014] 1. Good stability: Since the end of the burner brick forms a high-temperature area corresponding to the nozzle direction, the fuel gas can be quickly ignited and burned effectively (the common combustible gas methane has an auto-ignition temperature of 645°C), which is the key to stable combustion.

[0015] 2. Ultra-low NOx: Currently known NOx is mainly produced by O2 and N2 in the air under high temperature (above 1250°C) conditions, while the ideal combustion flame temperature of normal combustible gas is around 2000°C, so the presence of NOx is inevitable. After using this back-mixing premixing nozzle, the combustible gas will react and burn quickly with oxygen in the air first, which can greatly curb the generation of NOx.

[0016] 3. Low CO short flame: When the normal furnace temperature is above 700℃, under a certain amount of excess oxygen, the CO content in the flue gas is close to 0. However, when the furnace temperature is between 400-600℃, the conventional low-nitrogen burner structure cannot curb the generation of CO. After adopting this back-mixing premixing nozzle, the fuel gas is fully mixed with the air in advance, making it easier to burn, generating a relatively high temperature around the flame, accelerating the combustion of the fuel gas, and making the combustion flame relatively short. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the present invention.

[0018] Figure 2 for Figure 1 Bottom view of .

[0019] Figure 3 It is a schematic diagram of the assembly of a small load nozzle and a small back-mixing premixing nozzle.

[0020] Figure 4 for Figure 3 Side view of.

[0021] Figure 5 It is a schematic diagram of the assembly of the main load nozzle and the main back-mixing premixing nozzle.

[0022] Figure 6 for Figure 5 A partial schematic diagram of the A direction.

[0023] Wherein: burner shell 1; air inlet 1.1; brick support plate 1.2; ever-burning lamp 2; primary small-load back-mixing premixing spray gun 3; small air collecting pipe 3.1; branch small air pipe 3.2; small-load nozzle 3.3; small back-mixing premixing nozzle 3.4; first nozzle 3.4.1; first connecting block 3.4.2; first fixing ear 3.4.3; first nozzle accommodating chamber 3.4.4; first guide block 3.4.5; secondary main-load back-mixing premixing spray gun 4; main air collecting pipe 4.1; branch main air pipe 4.2; main-load nozzle 4.3; main back-mixing premixing nozzle 4.4; second nozzle 4.4.1; second connecting block 4.4.2; second fixing ear 4.4.3; second guide block 4.4.5; burner brick 5; insulation brick 5.1; fire channel brick 5.2. DETAILED DESCRIPTION

[0024] See also Figure 1-6The present invention relates to a premixing environmentally friendly burner, comprising a burner shell 1, a permanent lamp 2, a primary small load back-mixing premixing spray gun 3, a secondary main load back-mixing premixing spray gun 4 and a burner brick 5, wherein an air inlet 1.1 is arranged on the side of the burner shell, a brick supporting plate 1.2 is arranged on the upper part of the burner shell 1, and the burner brick 5 is placed on the brick supporting plate 1.2, the permanent lamp 2, the primary small load back-mixing premixing spray gun 3 and the secondary main load back-mixing premixing spray gun 4 are arranged in the burner shell, and the heads of the permanent lamp 2 and the primary small load back-mixing premixing spray gun 3 extend into the burner brick, the permanent lamp is ignited first and then the primary small load back-mixing premixing spray gun 3 is ignited by the flame of the permanent lamp, and the head of the secondary main load back-mixing premixing spray gun 4 is arranged outside the burner brick.

[0025] The primary small-load back-mixing premixing spray gun 3 includes a small air collecting pipe 3.1, branch small air pipes 3.2, a small-load nozzle 3.3, and a small back-mixing premixing nozzle 3.4. The small air collecting pipe 3.1 is arranged below the burner shell 1. The small air collecting pipe 3.1 is connected to multiple branch small air pipes 3.2, each branch small air pipe 3.2 is connected to a small-load nozzle 3.3, and the small-load nozzle 3.3 is connected to a small back-mixing premixing nozzle 3.4.

[0026] The small back-mixing premixing nozzle 3.4 is integrally cast and comprises a first nozzle 3.4.1, a first connecting block 3.4.2 and a first fixing ear 3.4.3. The first nozzle 3.4.1 and the first connecting block 3.4.2 are spaced apart from each other. A first nozzle accommodating cavity 3.4.4 is formed between the bottom of the first nozzle 3.4.1 and the first connecting block 3.4.2. Both ends of the first nozzle 3.4.1 and the first connecting block 3.4.2 are connected by the first fixing ear 3.4.3. The small load nozzle 3.3 is screwed to the first connecting block 3.4.2, and the small load nozzle 3.3 enters the first nozzle accommodating cavity 3.4.4. There is a gap between the small load nozzle 3.3 and the first nozzle 3.4.1, and the combustion-supporting air enters the first nozzle 3.4.1 from the gap to be premixed with the fuel gas.

[0027] A first guide block 3.4.5 is provided on the top of the first nozzle 3.4.1, and the first nozzle sprays the gas toward the burner brick 5 through the first guide block 3.4.5.

[0028] The secondary main load back-mixing premixing spray gun 4 includes a main air collecting pipe 4.1, a branch main air pipe 4.2, a main load nozzle 4.3 and a main back-mixing premixing nozzle 4.4. The main air collecting pipe 4.1 is arranged below the burner shell 1. The main air collecting pipe 4.1 is connected to multiple branch main air pipes 4.2, each branch main air pipe 4.2 is connected to a main load nozzle 4.3, and the main load nozzle 4.3 is connected to the main back-mixing premixing nozzle 4.4. The main back-mixing premixing nozzle 4.4 is integrally cast and has the same structure as the small back-mixing premixing nozzle 3.4, including a second nozzle 4.4.1, a second connecting block 4.4.2 and a second fixing ear 4.4.3. The second nozzle 4.4.1 and the second connecting block 4.4.2 are spaced apart from each other, and a second nozzle accommodating chamber 4.4.4 is formed between the bottom of the second nozzle 4.4.1 and the second connecting block 4.4.2. Both ends of the second nozzle 4.4.1 and the second connecting block 4.4.2 are connected by the second fixing ear 4.4.3. The branch main air pipe 4.2 enters the second nozzle accommodating chamber 4.4.4 after being inserted into the jack of the second connecting block 4.4.2. The main load nozzle 4.3 is screwed to the branch main air pipe 4.2 in the second nozzle accommodating chamber 4.4.4. There is a gap between the main load nozzle 4.3 and the second nozzle 4.4.1, and the combustion-supporting air enters the second nozzle 4.4.1 from this gap to be premixed with the fuel gas.

[0029] A second guide block 4.4.5 is provided on the top of the second nozzle 4.4.1, and the second nozzle sprays the gas toward the burner brick 5 through the guidance of the second guide block 4.4.5.

[0030] The burner brick 5 is composed of a heat-insulating brick 5.1 arranged at the bottom and a flue brick 5.2 arranged at the top to form a combustion channel area.

[0031] The primary small-load back-mixing premixing spray gun 3 passes through the burner shell 1 and the insulating brick 5.1 from bottom to top in sequence and enters the fireway brick 5.2. The small back-mixing premixing nozzle 3.4 located at the head of the primary small-load back-mixing premixing spray gun 3 is finally arranged in the fireway brick 5.2. The secondary main-load back-mixing premixing spray gun 4 passes through the burner shell 1 and the insulating brick 5.1 from bottom to top in sequence. The main back-mixing premixing nozzle 4.4 located at the head extends out from the insulating brick 5.1, and the main back-mixing premixing nozzle 4.4 is distributed outside the fireway brick 5.2.

[0032] High-pressure fuel gas of more than 0.05MPa is sprayed at high speed from the small-load nozzle 3.3 and the main-load nozzle 4.3, forming a negative pressure area around each nozzle, sucking in part of the air (or flue gas), driving the flue gas with relatively low oxygen content around the small back-mixing premixing nozzle 3.4 and the main back-mixing premixing nozzle 4.4 to enter and mix with the fuel gas, so that the fuel gas and air are fully mixed, accelerating the combustion of the fuel gas, and under the theory of coupled rich and thin combustion of the back-mixing premixing nozzle, ensuring that limited oxygen combines with the flammable gas molecules to burn, reducing the generation of NOx and CO during combustion.

[0033] The load of the primary small-load back-mixing premixing spray gun is only 5-10% of the normal load. It mainly sprays the premixed fuel gas and air from the back-mixing premixing nozzle for combustion. According to the design requirements, it sprays and burns to the end of the refractory bricks, burns the burner bricks red, and the burner bricks appear in a temperature part exceeding 800℃. At this high temperature, it can effectively ignite the fuel gas combustion.

[0034] In addition to the above embodiments, the present invention also includes other implementation modes. Any technical solutions formed by equivalent transformation or equivalent replacement should fall within the protection scope of the claims of the present invention.

Claims

1. A premixed environmentally friendly burner, comprising a burner housing, a permanent lamp, a primary small load back-mixed premixed spray gun, a secondary main load back-mixed premixed spray gun and a burner brick, wherein an air inlet is provided on the side of the burner housing, a brick support plate is provided on the upper part of the burner housing, and the burner brick is placed on the brick support plate, characterized in that: The head of the primary small-load back-mixing premixing spray gun is provided with a small back-mixing premixing nozzle, and the small back-mixing premixing nozzle and the ever-burning lamp are distributed in the burner brick. The head of the secondary main-load back-mixing premixing spray gun is provided with a main back-mixing premixing nozzle, and the main back-mixing premixing nozzle is distributed outside the burner brick. The bottoms of the small back-mixing premixing nozzle and the main back-mixing premixing nozzle are both provided with negative pressure areas, and part of the air is inhaled to be pre-mixed with the fuel gas; The small back-mixing premixing nozzle is integrally cast and includes a first nozzle, a first connecting block and a first fixing ear. The first nozzle and the first connecting block are spaced apart from each other. A first nozzle accommodating cavity is formed between the bottom of the first nozzle and the first connecting block. The first nozzle and the first connecting block are connected at both ends through the first fixing ear. The small load nozzle enters the first nozzle accommodating cavity, and a gap is left between the small load nozzle and the first nozzle. The combustion-supporting air enters the first nozzle from the gap and is premixed with the fuel gas. The primary small-load back-mixing premixing spray gun comprises a small air collecting pipe, a branch small air pipe, a small-load spray head and a small back-mixing premixing nozzle; The secondary main load back-mixing premixing spray gun comprises a main air collecting pipe, a branch main air pipe, a main load spray head and a main back-mixing premixing nozzle; The structure of the main back-mixing premixing nozzle is the same as that of the small back-mixing premixing nozzle.

2. A premixed environmentally friendly burner according to claim 1, characterized in that: The burner brick is formed by the lower insulation brick and the upper fire channel brick to form a combustion channel area. The primary small-load back-mixing premixing spray gun passes through the burner shell and the insulation brick from bottom to top in sequence and enters the fire channel brick. The small back-mixing premixing nozzle located at the head is finally arranged in the fire channel brick. The secondary main-load back-mixing premixing spray gun passes through the burner shell and the insulation brick from bottom to top in sequence. The main back-mixing premixing nozzle located at the head extends out from the insulation brick. The main back-mixing premixing nozzles are distributed outside the fire channel brick.

3. The premixed environmentally friendly burner according to claim 1, characterized in that: A first guide block is provided on the top of the first nozzle, and the first nozzle is guided by the first guide block to spray the gas toward the burner brick.

4. The premixed environmentally friendly burner according to claim 1, characterized in that: High-pressure fuel gas above 0.05MPa is ejected at high speed from the small-load nozzles and main-load nozzles, forming a negative pressure area around each nozzle and sucking in some air.

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