CN202692053U - Air distribution and flame stabilization device for flat flame burner - Google Patents

Abstract

The utility model relates to the technical field of metallurgy, in particular to an air distribution and flame stabilizer for a flat flame burner, which includes a gas nozzle flame stabilizer, a gas nozzle flame stabilizer is fitted with an air pan, and the side wall of the air distribution pan is provided with a ring There is a slanted hole, and a circle of chute holes is provided on the periphery; the flame stabilizer of the gas nozzle is a cap-shaped structure, the open end communicates with the gas core tube, the closed end is provided with a concave brim, and a There is a ring hole. The air distribution plate of the utility model can divide the air into three stages. The primary air forms a high-speed jet to disperse the gas; Under the diversion action of the concave brim of the flame-stabilizing head, a mixed gas swirl flow is formed to ensure the uniformity of the furnace temperature. The structure is simple and compact, easy to process and assemble, easy to use and system maintenance and modification.

Description

Flame stabilizer with air distribution for flat flame burner

technical field

The utility model relates to the technical field of metallurgy, in particular to an air distribution flame stabilizer applied to a combustion device on a heating furnace and a heat treatment furnace. the

Background technique

Flat flame combustion technology is a new, efficient and clean combustion technology developed on the basis of strong swirling jet combustion technology. Since its appearance in the 1960s, it has been widely used in the industrial sector, especially in the metallurgical industry. The flame ejected from the flat flame burner is a disc-shaped thin layer extending around the furnace wall, which forms a flat flame with an opening angle of 180°. Compared with ordinary straight flame burners, flat flame burners have a series of advantages such as good flame stability, uniform flame temperature distribution, less NO ₁ and NO ₂ emissions, fast heating of workpieces, and anti-oxidation. They are mainly used for heating workpieces that cannot On industrial furnaces in contact with open flames. In the domestic iron and steel metallurgy industry, flat flame burners are widely used on the roof of steel rolling heating furnaces and heat treatment furnaces that adopt conventional combustion methods. In order to form a stable flat flame, an air distribution and flame stabilization device is designed inside the burner, but the existing The structure of the air distribution and flame stabilizing device is relatively complicated, and it is inconvenient to process and assemble.

Utility model content

In view of the above problems, the purpose of this utility model is to provide an air distribution flame stabilizer for a flat flame burner with a more stable flame formation and a simple and compact structure. the

In order to achieve the above purpose, the technical solution adopted by the utility model is: an air distribution flame stabilizer for a flat flame burner, which is arranged inside the flat flame burner, and the flat flame burner is composed of burner bricks, air The pipe shell and the gas pipe shell are connected sequentially. The burner brick is provided with a flared nozzle. The end of the gas core pipe passes through the center of the air pipe shell and extends into the nozzle inside the burner brick. It is fixed on the gas pipeline shell and communicated with the gas inlet; it is characterized in that: the end of the gas core pipe is fixedly connected with a gas nozzle flame stabilizer, the gas nozzle flame stabilizer is equipped with a wind pan, and the side wall of the air distribution pan There is a circle of inclined holes, which gather toward the end of the gas core pipe, and a circle of inclined groove holes is provided on the periphery of the air distribution plate to make the gas form a wall-attached swirl; the flame stabilizer of the gas nozzle is open at one end and closed at the other end The open end communicates with the gas core pipe, the closed end is provided with a concave brim, and a ring hole is provided between the brim and the air distribution plate. the

Two electrode holes are provided on the end surface of the gas pipeline shell, through which the electrodes penetrate into the nozzle of the burner brick and the end is positioned at the end of the air distribution panel, and the electrodes are electrically connected to the high voltage pack. the

A burner conduit is arranged between the nozzle of the burner brick and the air distribution plate, and the burner conduit is embedded in the nozzle on the small diameter side of the burner brick. the

The air distribution plate of the utility model can divide the air into three stages. The primary air is ejected through the inclined hole on the air distribution plate to form a high-speed jet flow, which disperses the gas ejected from the gas nozzle and accelerates the mixing of air and gas; the secondary air passes through The chute hole on the circumference of the air distribution plate sprays out to form a high-speed wall-attached swirl flow, which provides the necessary conditions for the formation of a flat flame; a small amount of tertiary air is sprayed out through the gap between the air distribution plate and the burner duct, which mainly acts as a cooling duct. And the effect of trimming the flame shape. The tertiary air forms a mixed cyclone flow under the diversion of the concave brim of the flame-stabilizing head, forming a more stable flat flame and ensuring the uniformity of the furnace temperature. Compared with ordinary flat-flame burners, the structure is simpler and more compact, which is convenient for processing and assembly; the overall burner adopts a modular design, and the use and system maintenance and transformation are very simple. the

Description of drawings

Fig. 1 is the structural representation when the utility model embodiment is applied;

Fig. 2 is the front view of the utility model embodiment;

Fig. 3 is a three-dimensional schematic diagram of the external pipeline when the utility model embodiment is applied;

Marking description in the figure: 1-burner brick, 2-burner duct, 3-gas nozzle flame stabilizer, 4-air distribution plate, 5-gas core pipe, 6-air pipe shell, 7-first pressure gas Mouth, 8-gas pipe shell, 9-peep hole, 13-air inlet, 14-gas inlet, 15-second pressure nozzle, 16-furnace body surface, 17-gas pipeline, 18-electromagnetic valve, 19-hand valve, 20-air pipeline, 21-flat flame burner with automatic ignition and flame detection, 401-electrode hole, 402-oblique hole, 403-chute hole.

Detailed ways

In order to better understand the utility model, the technical solution of the utility model is further described below in conjunction with the embodiments and accompanying drawings, referring to Fig. 1 to Fig. 3:

计算烧嘴砖1进口直径R，其中S为旋流强度，一般取S≧0.6时可形成强旋流进而形成平展气流，r为煤气喷孔当量半径，α为空气配风盘旋流角度。之后根据旋流强度和火焰喷出速度计算烧嘴砖1喇叭口的长度，再根据设计功率和火焰喷出强度确定出口截面积进而确定烧嘴砖1大径尺寸。烧嘴砖1小径侧装有烧嘴导管2，同侧的端面连接空气管道壳体6的端面。空气管道壳体6整体采用碳钢精密铸造成型，两端面均设有连接法兰并通过连接法兰分别连接烧嘴砖1和煤气管道壳体8，空气管道壳体垂直方向设有空气进口13、取压嘴安装孔，空气进口13与空气管路20连通，取压嘴安装孔安装第一取压嘴7。煤气管道壳体8采用碳钢精密铸造后加工成型，垂直方向设有煤气进口14与煤气管路17连通，内部采用垂直通道与煤气芯管安装孔连通，与空气管道壳体6连接端设有连接法兰，另一端面开有窥视孔安装孔、接地螺栓安装孔及取压嘴安装孔，分别安装窥视孔9、接地螺栓和第二取压嘴15。煤气芯管5首端从空气管道壳体6中心穿过，伸入烧嘴砖1喷口内的烧嘴导管2后与煤气喷头稳焰器3焊接固定，末端固定于煤气管道壳体8上的煤气芯管安装孔，并与煤气管道壳体8上的煤气进口14连通。煤气喷头稳焰器3上套装配风盘4，可通过安装尺寸调节配风盘4在烧嘴导管2中的位置。 The air distribution and flame stabilizer for flat flame burners implemented according to the utility model is applied inside the flat flame burners. The flat flame burners mainly include burner brick 1, air pipe shell 6, gas pipe shell 8, gas Core tube 5. The burner brick 1 is a cylinder with a horn-shaped spout, placed horizontally. The anchor nails are welded on the fixed plate at the tail, and the burner brick is molded with castable materials. The long-term use temperature is 1350 ° C, and the highest temperature resistance level can reach 1600 ° C. The diameter and length of the inlet and outlet of the burner brick 1 are formed according to the burner power and the flat flame. Calculation and determination of the necessary conditions: first select the appropriate equivalent radius of the gas injection hole according to the burner power and the design injection flow rate, and then according to the calculation formula of the swirl intensity

Calculate the diameter R of the burner brick 1 inlet, where S is the swirling flow intensity. Generally, when S≧0.6, a strong swirling flow can be formed to form a flat air flow. r is the equivalent radius of the gas nozzle hole, and α is the swirling flow angle of the air distribution disc. Then calculate the length of the bell mouth of the burner brick 1 according to the swirling flow intensity and the flame ejection speed, and then determine the outlet cross-sectional area according to the design power and flame ejection intensity to determine the major diameter of the burner brick 1. The small diameter side of the burner brick 1 is equipped with a burner conduit 2 , and the end face of the same side is connected to the end face of the air duct housing 6 . The air pipe shell 6 is formed by carbon steel precision casting as a whole, with connecting flanges on both ends and connecting the burner brick 1 and the gas pipe shell 8 respectively through the connecting flanges, and the air pipe shell is provided with an air inlet 13 in the vertical direction , Take the pressure nozzle installation hole, the air inlet 13 is communicated with the air pipeline 20, and the first pressure nozzle 7 is installed in the pressure nozzle installation hole. The gas pipeline housing 8 is processed and formed by carbon steel precision casting. The gas inlet 14 is vertically connected to the gas pipeline 17. The interior adopts a vertical channel to communicate with the gas core pipe installation hole, and the connecting end of the air pipeline housing 6 is provided with Connecting the flange, the other end face is provided with a peephole installation hole, a grounding bolt installation hole and a pressure-taking nozzle installation hole, and the peephole 9, the grounding bolt and the second pressure-taking nozzle 15 are installed respectively. The head end of the gas core pipe 5 passes through the center of the air pipe shell 6, and extends into the burner conduit 2 in the nozzle of the burner brick 1, and then is welded and fixed with the gas nozzle flame stabilizer 3, and the end is fixed on the gas pipe shell 8 The gas core tube is installed in a hole, and is communicated with the gas inlet 14 on the gas pipeline housing 8 . The gas nozzle flame stabilizer 3 is fitted with an air pan 4, and the position of the air distribution pan 4 in the burner duct 2 can be adjusted through the installation size.

The air distribution plate 4 is formed by numerical control machining, and a circle of inclined holes 402 is processed on the side wall, and the inclined holes 402 gather toward the end of the gas core pipe. The same, so that the passing gas forms a wall-attached swirl. The air passing through the air distribution plate 4 is divided into three stages. The primary air is ejected through the oblique hole 402 on the air distribution plate 4 to form a high-speed jet, which disperses the gas ejected from the gas nozzle 3 and accelerates the mixing of air and gas; the secondary air passes through The chute hole 403 on the circumference of the air distribution plate 4 sprays out to form a high-speed wall-attached swirl, which provides the necessary conditions for the formation of a flat flame; a small amount of tertiary air is sprayed out annularly through the gap between the air distribution plate 4 and the burner conduit 2, It mainly plays the role of cooling the duct and trimming the shape of the flame. the

The flame stabilizer 3 of the gas nozzle is formed by numerical control, and there is a circle of ring holes on its side. The gas sprayed out is dispersed and mixed by the high-speed jet from the air distribution plate 4, and formed under the diversion of the concave brim of the flame stabilizer. The mixed cyclone flow forms a flat flame through the horn nozzle of the burner brick 1. the

When the utility model is applied, it can also be automatically ignited, and electrodes need to be installed. The end face of the gas pipeline housing 8 has an electrode installation hole, and the electrode penetrates through the electrode installation hole on the gas pipeline housing 8, and passes through the gas pipeline housing 8, After the air pipe shell 6 and the air distribution plate 4, the position of the electrode end is controlled according to strict assembly dimensions to ensure the ignition effect with the gas nozzle flame stabilizer 3. The end of the electrode exposed from the electrode mounting hole is electrically connected to the high voltage package. The high-voltage pack discharges and ignites. the

The implementation process of the utility model is as follows: the gas pipeline 17 and the air pipeline 20 are provided with a hand valve 19, and the air gas flow rate and proportion of a single burner can be adjusted through the hand valve 19 to achieve an ideal combustion effect. Before the burner is ignited, adjust the air hand valve 19 to a proper position. When the controller receives the ignition command, it controls the discharge of the high-voltage package to make the electrodes ignite. The nozzle is mixed with the combustion-supporting air that has been passed into the burner, and the primary air is ejected through the inclined hole 402 on the air distribution plate 4 to form a high-speed jet, which disperses the gas ejected from the gas nozzle regulator 3 and accelerates the air. mix. The secondary air is sprayed out through the chute hole 403 on the circumference of the air distribution plate 4 to form a high-speed swirling flow, and a small amount of tertiary air is sprayed out annularly through the gap between the air distribution plate 4 and the burner duct 2, mainly for cooling ducts and trimming. The role of the flame shape. When the burner receives the flameout signal, the gas pipeline 17 is closed, the flame is extinguished, and the combustion-supporting air continues to pass in to play the role of cooling and protecting the burner. The flat-flame burner 21 with automatic ignition and flame detection device has good flame stability, uniform flame temperature distribution, less NO ₁ and NO ₂ emissions, fast workpiece heating, and can greatly reduce the oxidation of the heated workpiece.

What is disclosed above is only a preferred embodiment of the utility model, and of course the scope of rights of the utility model cannot be limited with this. Therefore, the equivalent changes made according to the patent scope of the utility model still belong to the protection of the utility model scope. the

Claims (3)

1. flat flame burner air distribution flame holder, be arranged on flat flame burner inside, flat flame burner is connected in sequence by burner block (1), the air duct housing (6), the gas piping housing (8) that are used to into air, burner block (1) is provided with the spout that is bell mouth shape, coal gas core pipe (5) is terminal to be passed from air duct housing (6) center, stretches in the spout in the burner block (1), that head end is fixed in gas piping housing (8) is upper and be communicated with gas inlet; It is characterized in that: described coal gas core pipe (5) end is fixedly connected with gas-jet flame holder (3), the upper suit of gas-jet flame holder (3) air-distributing disc (4), described air-distributing disc (4) sidewall is provided with a circle inclined hole, inclined hole is assembled towards coal gas core pipe (5) end direction, and air-distributing disc (4) circumferential edge is along being provided with a circle tilted slotted hole that makes gas form adherent eddy flow; Described gas-jet flame holder (3) is the cap-like structure of an end opening, end sealing, and openend is communicated with described coal gas core pipe (5), and blind end is provided with the matrix shade, is provided with a ring hole between shade and the described air-distributing disc (4).

2. flat flame burner according to claim 1 air distribution flame holder, it is characterized in that: described gas piping housing (8) end face is provided with two electrode holes, electrode (10) is positioned air air-distributing disc (4) end by spout and the end that electrode hole penetrates burner block (1), and electrode (10) is electrically connected with high voltage package.

3. flat flame burner according to claim 1 air distribution flame holder is characterized in that: be provided with burner conduit (2) between the spout of described burner block (1) and the air-distributing disc (4), in the spout of burner conduit (2) embedding burner block (1) path side.

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