CN107726314A - A kind of low nitrogen combustion apparatus - Google Patents

Abstract

The invention relates to a low-nitrogen combustion device, which includes a burner with a combustion chamber, one end of the burner is an inlet end, and the other end is an outlet end, an ignition device is arranged in the burner, and the one near the inlet end in the combustion chamber is The primary combustion zone forms a secondary combustion zone behind the primary combustion zone in the combustion chamber, and the combustion temperature in the combustion chamber is not higher than 1500°C; at least one set is set in the secondary combustion zone to make the gas entering the combustion zone form A counterclockwise air distributor that rotates counterclockwise, and a set of clockwise air distributors that make the gas rotate clockwise; the counterclockwise air distributor is placed in front or behind the clockwise air distributor. In the present invention, since the combustion temperature is lower than 1500 DEG C, the production of NOx is reduced in the combustion process; and the burnout rate and combustion efficiency of the combustible gas are improved through the effect of air distribution.

Description

A low nitrogen combustion device

technical field

The invention relates to a low-nitrogen combustion device.

Background technique

During the combustible gas combustion process, since the combustible gas and the air cannot be fully mixed in the burner, nitrogen oxides will be produced during the combustion process, and the flue gas discharged after combustion cannot meet the national air pollution emission standards, resulting in Certain air pollution.

Contents of the invention

In view of the above technical problems, the object of the present invention is to provide a low-nitrogen combustion device capable of mixing gases to reduce the generation of nitrogen oxides and meet the requirements of air pollution emission standards.

Realize the technical scheme of the present invention as follows:

A low-nitrogen combustion device, including a burner with a combustion chamber, one end of the burner is the inlet end, and the other end is the discharge end, an ignition device is arranged in the burner, and the primary combustion zone is near the inlet end in the combustion chamber ,

A secondary combustion zone is formed behind the primary combustion zone in the combustion chamber, and the combustion temperature in the combustion chamber is not higher than 1500°C;

In the secondary combustion zone, there are at least one set of counterclockwise air distributors that make the gas entering the combustion zone form a counterclockwise swirl, and a set of clockwise air distributors that make the gas form a clockwise swirl; the counterclockwise The air distributor is placed in front or behind the clockwise air distributor.

Further, the counterclockwise air distributor includes a plurality of sheet-shaped counterclockwise air distribution pieces, one end of the counterclockwise air distribution piece is fixed on the inner wall of the burner, and the other end is suspended in the air;

A plurality of counterclockwise air distribution pieces are arranged at intervals along the inner circumference of the burner. The plane where each counterclockwise air distribution piece is located is inclined to the radial direction of the burner and the adjacent counterclockwise air distribution pieces are inclined in the same direction. Each counterclockwise air distribution sheet has an inner air distribution surface and an outer air distribution surface, and a counterclockwise air guide cloth is formed between the outer air distribution surface of the counterclockwise air distribution sheet and the inner air distribution surface of the adjacent counterclockwise air distribution sheet. wind channel.

Further, the plane where the counterclockwise air distribution piece is located is perpendicular to or inclined to the inner wall of the burner.

Further, the counterclockwise air distribution piece is straight.

Further, the clockwise air distributor includes a plurality of sheet-shaped clockwise air distribution pieces, and the arrangement directions of the clockwise air distribution pieces and the counterclockwise air distribution pieces are opposite.

Further, it also includes a primary distribution fan for distributing air to the primary combustion zone, and the output end of the primary distribution fan extends into the primary combustion zone.

Further, an annular air distribution chamber is formed in the secondary combustion section outside the burner, and a secondary distribution fan that supplies air to the air distribution chamber is distributed on the burner to communicate with the air distribution chamber and the secondary combustion chamber. The air distribution hole in the air distribution chamber; the air in the air distribution chamber enters from around the secondary combustion area to the secondary combustion area through the air distribution hole.

With the above technical scheme, the combustible gas (a combustible gas or a mixture of multiple combustible gases) enters the burner from the inlet end of the burner, and after being ignited by the ignition device, a combustion reaction occurs in the primary combustion zone, and then enters the secondary combustion zone. Combustion is carried out in the combustion zone. Since the secondary combustion zone is equipped with a counterclockwise air distributor and a clockwise air distributor for mixed air distribution, the combustion efficiency of the secondary combustion zone can be improved. In the present invention, since the combustion temperature is lower than 1500°C, the generation of NOx is reduced in the combustion process; and the burnout rate and combustion efficiency of the combustible gas are improved through the effect of air distribution.

Description of drawings

Fig. 1 is a simplified schematic diagram of the structure of the present invention;

Fig. 2 is the three-dimensional structure schematic diagram of the present invention;

Fig. 3 is a schematic diagram of the end structure of Fig. 1;

Fig. 4 is a schematic diagram of the internal structure of Fig. 1;

Fig. 5 is the schematic structural view after the burner is hidden in Fig. 4;

Figure 6 is a schematic diagram of the simple structure inside the burner;

Fig. 7 is a structural schematic diagram of Embodiment 1 of the counterclockwise air distributor in the present invention;

Fig. 8 is a schematic structural diagram of Embodiment 2 of the counterclockwise air distributor in the present invention;

Fig. 9 is a structural schematic diagram of Embodiment 3 of the counterclockwise air distributor in the present invention;

Fig. 10 is a three-dimensional structural schematic diagram of a clockwise air distributor in the present invention;

Fig. 11 is a schematic plan view of a clockwise air distributor in the present invention;

In the figure: 1 is the burner, 2 is the inlet end, 3 is the discharge end, 4 is the ignition device, 5 is the primary combustion zone, 6 is the secondary combustion zone, 7 is the counterclockwise air distribution device, 8 is the clockwise air distribution 9 is the counterclockwise air distribution piece, 10 is the middle channel, 11 is the circular plate, 12 is the inner air distribution surface, 13 is the outer air distribution surface, 14 is the air distribution channel, 15 is the clockwise air distribution piece, 16 For a distribution fan, 17 is an air distribution chamber, 18 is a secondary distribution fan, and 19 is an air distribution hole.

detailed description

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the following will clearly and completely describe the technical solutions of the embodiments of the present invention in conjunction with the drawings of the embodiments of the present invention. Apparently, the described embodiments are some, not all, embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

As shown in Figure 1-11, a low-nitrogen combustion device includes a burner 1 with a combustion chamber. The combustion chamber of the burner is preferably a circular chamber. End 2, for the combustible gas to enter the combustion chamber for combustion, and the other end is the discharge end 3, for the discharge of the gas after combustion in the combustion chamber. An ignition device 4 is arranged in the burner, and the ignition device can use the current burner Any device used can be selected according to the needs; in the combustion chamber, near the entry end is the primary combustion zone 5, and the combustible gas entering the combustion chamber is ignited by the ignition device, and first burns in the primary combustion zone. The secondary combustion zone 6 is formed behind the primary combustion zone in the combustion chamber, and the combustion temperature in the combustion chamber is not higher than 1500° C. to avoid the generation of NOx.

In order to improve the burnout and combustion efficiency of the combustible gas in the secondary combustion zone, at least one set of counterclockwise air distributors 7 is provided in the secondary combustion zone to make the gas entering the combustion zone swirl counterclockwise, and a set of A clockwise air distributor 8 that makes the gas rotate clockwise; a counterclockwise air distributor is placed in front or behind the clockwise air distributor. When setting two or more counterclockwise air distributors and clockwise air distributors, the counterclockwise air distributors and clockwise air distributors are arranged in the combustion chamber at intervals, as shown in Figure 4/5, four The air distributors are arranged at intervals. The combustible gas entering from the inlet end enters the clockwise air distributor after passing through the counterclockwise air distributor, or enters the counterclockwise air distributor after passing through the clockwise air distributor. Select and set according to specific needs.

The specific structure of the counterclockwise air distributor is described below: the counterclockwise air distributor includes a plurality of straight counterclockwise air distribution pieces 9, one end of the counterclockwise air distribution piece is fixed on the inner wall of the burner 1, and the other end is suspended in the air ; The suspended ends of the counterclockwise air distribution sheet are surrounded by an intermediate channel 10 (as shown in Figure 8), or the suspended ends are jointly fixedly connected to the outer peripheral wall of a circular disk 11 (as shown in Figure 9), through the circular The setting of the disk, one is to increase the connection strength of the air distribution piece, and two, when the combustible gas enters, it can be impacted on the circular disk to disperse around, increasing the impact and mixing between the gases; the fixed connection here can be welded, Common fixed connection methods such as bolts and the like. A plurality of counterclockwise air distribution pieces are arranged at intervals along the inner circumference of the burner. The air blades are inclined in the same direction, and the above-mentioned included angle A is not equal to 0°, 90° and 180°, that is, the plane where the counterclockwise air distribution blades are located does not coincide with the radial and axial directions of the burner; each counterclockwise air distribution The sheet has an inner air distribution surface 12 and an outer air distribution surface 13, and a counterclockwise air distribution channel 14 is formed between the outer air distribution surface of the counterclockwise air distribution sheet and the inner air distribution surface of the adjacent counterclockwise air distribution sheet , so that the combustible gas can pass through to form a diversion.

Here, there are two ways to arrange the counterclockwise air distribution piece and the inner wall of the burner, one is that the plane where the counterclockwise air distribution piece is located is perpendicular to the inner wall of the burner (as shown in Figure 7); the other is: counterclockwise The plane where the air blades are located is arranged inclined to the inner wall of the burner (as shown in Figure 2/8/9), so that the length of the air distribution device increases in the air distribution, that is, the entire counterclockwise air distribution device is in the shape of a cone, which increases the air distribution Capacity; when using this method, the counterclockwise air distributor can guide the incoming gas more towards the inner periphery of the burner, and when the clockwise air distributor adopts this method, it can guide the incoming gas The gas in the clockwise air distributor is directed toward the middle of the burner. The clockwise and counterclockwise air distributors with such a structure can speed up the disturbance and mixing between the gases and improve the reaction efficiency between the gases.

The clockwise air distributor includes a plurality of clockwise air distribution pieces 15 , and the arrangement direction of the clockwise air distribution pieces is opposite to that of the counterclockwise air distribution pieces. Since the structure of the clockwise air distributor and the counterclockwise air distributor are the same, only the arrangement direction is different, the specific structure will not be repeated here.

It also includes a primary distribution fan 16 for distributing air to the primary combustion zone, and the output end of the primary distribution fan extends into the primary combustion zone. An annular air distribution chamber 17 is formed in the secondary combustion section outside the burner, and a secondary distribution fan 18 that supplies air to the air distribution chamber is distributed on the burner to communicate with the air distribution chamber and the secondary combustion area. The air distribution hole 19 of the air distribution chamber; the wind in the air distribution chamber enters from around the secondary combustion area to the secondary combustion area through the air distribution hole; the wind entering from the air distribution hole is mixed with the combustible gas through the air distribution device to accelerate Burnout rate and combustion efficiency of combustible gases.

Claims (7)

1. A low-nitrogen combustion device, comprising a burner with a combustion chamber, one end of the burner is an inlet end, and the other end is a discharge end, an ignition device is arranged in the burner, and it is characterized in that, in the combustion chamber, it is close to The entry end is the primary combustion zone, A secondary combustion zone is formed behind the primary combustion zone in the combustion chamber, and the combustion temperature in the combustion chamber is not higher than 1500°C; In the secondary combustion zone, there are at least one set of counterclockwise air distributors that make the gas entering the combustion zone form a counterclockwise swirl, and a set of clockwise air distributors that make the gas form a clockwise swirl; the counterclockwise The air distributor is placed in front or behind the clockwise air distributor. 2. A low-nitrogen combustion device according to claim 1, wherein the counterclockwise air distribution device includes a plurality of counterclockwise air distribution pieces, and one end of the counterclockwise air distribution piece is fixed to the burner inner wall, the other end is suspended; A plurality of counterclockwise air distribution pieces are arranged at intervals along the inner circumference of the burner. The plane where each counterclockwise air distribution piece is located is inclined to the radial direction of the burner and the adjacent counterclockwise air distribution pieces are inclined in the same direction. Each counterclockwise air distribution sheet has an inner air distribution surface and an outer air distribution surface, and a counterclockwise air guide cloth is formed between the outer air distribution surface of the counterclockwise air distribution sheet and the inner air distribution surface of the adjacent counterclockwise air distribution sheet. wind channel. 3. A low-nitrogen combustion device according to claim 2, wherein the plane where the counterclockwise air distribution piece is located is perpendicular to or inclined to the inner wall of the burner. 4. A low-nitrogen combustion device according to claim 2 or 3, characterized in that the counterclockwise air distribution piece is straight. 5. A low-nitrogen combustion device as claimed in claim 4, wherein the clockwise air distributor includes a plurality of clockwise air distribution pieces, and the clockwise air distribution piece and the counterclockwise air distribution piece The slices are arranged in the opposite direction. 6. A low-nitrogen combustion device according to claim 1, further comprising a primary distribution fan for distributing air to the primary combustion zone, the output end of the primary distribution fan extends into the primary combustion zone. 7. A low-nitrogen combustion device as claimed in any one of claims 1-3, 4-6, characterized in that an annular air distribution chamber is formed in the secondary combustion section outside the burner, and The secondary distribution fan for air supply in the air distribution chamber is distributed with air distribution holes connecting the air distribution chamber and the secondary combustion area on the burner; the air in the air distribution chamber flows from the surrounding area of the secondary combustion area to the Enter the secondary combustion zone.