CN202561754U - Flat-flame burning nozzle with automatic-ignition and flame-detection device - Google Patents

Abstract

The utility model relates to the technical field of metallurgy, in particular to a flat-flame burner with an automatic ignition and flame detection device, comprising a burner brick, the burner brick is connected to an air pipe shell, and the air pipe shell is connected to a gas pipe shell. The gas core pipe extends into the nozzle of the burner brick and is welded and fixed with the flame stabilizer of the gas nozzle; the upper cover of the flame stabilizer of the gas nozzle is equipped with an air pan, and the air pipe shell is provided with an air inlet to connect with the air pipeline; The pipeline casing is connected to the gas pipeline, and the two electrode holes are inserted into the electrodes; the electrodes are electrically connected to the high-voltage package, and the high-voltage package is electrically connected to the controller; the electrodes are electrically connected to the detection port of the controller, and the electromagnetic valve of the gas pipeline is electrically connected to the controller. connect. The utility model adds automatic ignition and flame detection functions, realizes switch control, and realizes pulse control for a combustion system using a flat flame burner; and forms a stable flat flame to ensure the uniformity of the furnace temperature. The structure is simple and compact, and can widely used.

Description

Flat flame burner with automatic ignition and flame detection

technical field

The utility model relates to the technical field of metallurgy, in particular to a novel combustion device with automatic ignition and flame detection devices applied to heating furnaces and heat treatment furnaces.

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 mainly used in two aspects: First, flat-flame burners are arranged on the roof of steel rolling heating furnaces that adopt conventional combustion methods. The power of this type of burner is relatively large, generally at 150~ Within the range of 300kw, manual ignition is adopted. The second is to use low-power flat-flame burners on the heat treatment furnace for low-temperature heating or drying. The power of the burners is generally not more than 100kw, and manual ignition is also used. Manually ignited flat-flame burners cannot achieve pulse control when precise control of the furnace temperature is required, and can only supply heat to the furnace with a constant power.

Utility model content

In view of the above problems, the utility model is designed with a combustion device with automatic ignition and flame detection. One of its utility model purposes is to form a stable and uniform flat flame; another purpose is to realize switch control to ensure furnace temperature adjustment. the accuracy.

In order to achieve the above purpose, the technical solution adopted by the utility model is: a flat flame burner with automatic ignition and flame detection device, which mainly includes a burner brick, an air pipe shell, a gas pipe shell, and a gas core tube , air distribution plate, gas nozzle flame stabilizer; the burner brick is provided with a trumpet-shaped nozzle, and the side wall of the side wall of the small diameter side of the burner brick nozzle is connected to the end face of the air pipe shell, and the other end face of the air pipe shell is connected to The gas pipe shell, the end of the gas core pipe passes through the center of the air pipe shell, extends into the nozzle of the burner brick and is welded and fixed with the flame stabilizer of the gas nozzle, and the head end is fixed on the gas pipe shell and connected with the gas pipe shell The gas inlet on the body is connected; the upper cover of the flame stabilizer of the gas nozzle is equipped with a fan plate, and the side wall of the fan plate is provided with a circle of oblique holes, and the oblique holes gather towards the end of the side gas core pipe, and the periphery of the air distribution plate is equipped with a ring to make the gas form A circle of chute holes attached to the wall swirl; a circle of through holes is opened on the side wall of the flame stabilizer of the gas nozzle; the air duct housing is provided with an air inlet and a first pressure-taking nozzle, and the air inlet and the air pipeline The first pressure-taking nozzle is connected with a barometer; the gas pipeline shell is provided with a gas inlet, two electrode holes, a peep hole and a second pressure-taking nozzle, the gas inlet is connected to the gas pipeline, and the electrode penetrates into the burner through the electrode hole. The nozzle of the nozzle brick is positioned at the end of the air distribution plate, and the second pressure-taking nozzle is connected to a barometer; the electrode is electrically connected to the high-voltage package, and the high-voltage package is electrically connected to the controller; the electrode is electrically connected to the controller, and the gas pipeline is installed There is an electromagnetic valve, and the control end of the electromagnetic valve is electrically connected with the controller.

The flame stabilizer of the gas nozzle is a hat-shaped structure with one end open and one end closed. The open end communicates with the gas core pipe, and the closed end is provided with a concave brim. Axial through hole.

A fixing plate is arranged between the burner brick and the air pipe shell, and anchor nails are welded on the fixing plate and the burner brick.

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.

Both the gas pipeline and the air pipeline are provided with hand valves.

Beneficial effects of the utility model: While retaining the inherent advantages of the flat flame burner, the functions of automatic ignition and flame detection are creatively added, and the switch control is realized, which provides basic conditions for the combustion system using the flat flame burner to realize pulse control ;The unique design of the air distribution plate and the integrated gas nozzle flame stabilizer can form a stable flat flame, ensuring the uniformity of the furnace temperature, and the structure is simpler and more compact than ordinary flat flame burners, which is convenient for processing and assembly; The nozzle adopts a modular design as a whole, which is very convenient for use and system maintenance and modification. This type of burner has a large power adjustment range, and different specifications of the burner can achieve a heating capacity ranging from 20 to 600kw, which can be widely used in the fields of workpiece heating and heat treatment.

Description of drawings

Fig. 1 is the schematic diagram of the utility model embodiment structure;

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

Figure 3 is a schematic diagram of the assembly of the air distribution panel and the flame stabilizer of the gas nozzle according to the embodiment of the present invention;

Fig. 4 is a three-dimensional schematic diagram when the utility model embodiment is applied;

Fig. 5 is a schematic diagram of the control principle of the utility model embodiment;

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, 10-electrode, 11-electrode hole plug, 12-ground screw, 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 will be further described below in conjunction with the embodiments and accompanying drawings, see Fig. 1 to Fig. 5:

The flat flame burner with automatic ignition and flame detection device implemented according to the utility model mainly includes burner brick 1, air pipe shell 6, gas pipe shell 8, gas core pipe 5, air distribution plate 4, gas Nozzle flame stabilizer 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。 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 housing 6 is formed by carbon steel precision casting as a whole, and the two ends are provided with connecting flanges through which the burner brick 1 and the gas pipe housing 8 are respectively connected. The air pipe housing 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 connection end of the air pipeline housing 6 is provided with Connect the flange, and the other end face is provided with an electrode installation hole, a peep hole installation hole, a ground bolt installation hole and a pressure-taking nozzle installation hole, respectively install the electrode 10, the peep hole 9, the ground bolt and the second pressure-taking nozzle 15, The pressure taking nozzle 7 and the second pressure taking nozzle 15 are used for air gas pressure data collection during burner debugging.

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 the side wall is processed with a circle of inclined holes 402. The inclined holes 402 gather toward the end of the side gas core pipe. The direction is 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 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.

One end of the electrode 10 penetrates through the electrode installation hole on the gas pipeline housing 8, passes through the gas pipeline housing 8, the air pipeline housing 6 and the air distribution plate 4 in sequence, and then is installed on the gas nozzle flame stabilizer 3, according to strict regulations. The assembly size controls the position of the end of the electrode 10 to ensure the ignition effect with the flame stabilizer 3 of the gas nozzle. The other end of the electrode 10 is electrically connected to the high voltage pack, and the high voltage pack is electrically connected to the controller, and the controller controls the discharge of the high voltage pack. The electrodes 10 are electrically connected to the detection port of the controller at the same time. After stable combustion, a 220V voltage is applied to the same electrode 10 to detect whether there is a stable flame between the electrode tip and the flame stabilizer 3 of the gas nozzle by means of ion detection. flame, it can form a closed circuit, and the electrode 10 returns a detection current value of about 4~40μA to the controller. The controller integrates a signal processing circuit and an A/D conversion circuit to realize automatic detection of whether the flame is formed. If it is found that the gas is charged, but the ignition is not successful, it is necessary to control and cut off the gas immediately to avoid danger, so the gas pipeline 17 is provided with an electromagnetic valve 18, and the control end of the electromagnetic valve 18 is electrically connected to the controller to control the closing of the electromagnetic valve 18 To cut off the gas of the gas pipeline 17.

The implementation process of the utility model is: the flat flame burner 21 is fixed on the furnace body surface 16 of the heating equipment through the integral masonry of the burner brick 1 and the furnace wall or an additional installation flange, the gas pipeline 17 and the air pipeline 20 Hand valves 19 are provided on each burner, through which the air gas flow rate and ratio of a single burner can be adjusted to achieve an ideal combustion effect. Before the burner is ignited, adjust the air hand valve 19 to a suitable position. When the controller receives the ignition command, it controls the discharge of the high-voltage package to make the electrode 10 ignite, and at the same time controls the electromagnetic valve 18 on the gas pipeline 17 to open, and the gas flow into the burner, mixed with the combustion-supporting air that has been passed into the burner for combustion, and returns the detection current through the electrode 10 after the flame is stable. When the burner received the flameout signal, the electromagnetic valve 18 on the gas pipeline 17 was closed, the flame was extinguished, and the combustion-supporting air continued to feed in to cool and protect the burner. This 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, and fast workpiece heating, which can greatly reduce the oxidation of the heated workpiece, and can Realize on-off control, and can be widely used in heating and heat treatment fields requiring pulse combustion control.

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.

Claims (7)

1. A flat flame burner with automatic ignition and flame detection device, characterized in that it mainly includes burner brick (1), air pipe shell (6), gas pipe shell (8), gas core Pipe (5), air distribution plate (4), gas nozzle flame stabilizer (3); the burner brick (1) is provided with a bell-shaped nozzle, and the side wall of the burner brick (1) on the side of the small diameter of the nozzle Connect the end face of the air pipe shell (6), the other end face of the air pipe shell (6) is connected to the gas pipe shell (8), the end of the gas core pipe (5) passes through the center of the air pipe shell (6), and extends The nozzle of the burner brick (1) is fixedly connected with the gas nozzle flame stabilizer (3), and the head end of the gas core pipe (5) is fixed on the gas pipeline shell (8) and communicated with the gas inlet; the gas nozzle is stable The upper cover of the flame device (3) is equipped with an air pan (4). A circle of oblique holes is arranged on the side wall of the air distribution pan (4). The inclined holes gather toward the end of the side gas core pipe (5). There is a ring of chute holes for the gas to form a swirling flow against the wall; a ring of holes is opened on the side wall of the flame stabilizer (3) of the gas nozzle; the air duct housing (6) is provided with an air inlet (13) and The air pipeline (20) is connected; the gas pipeline housing (8) is provided with a gas inlet (14) and two electrode holes, the gas inlet (14) is connected with the gas pipeline (17), and the electrode (10) passes through the electrode hole. Enter the nozzle of the burner brick (1) and the end is positioned at the end of the air distribution plate (4); the electrode (10) is electrically connected to the high voltage package, and the high voltage package is electrically connected to the controller; the electrode (10) is electrically connected to the controller At the detection port, the gas pipeline (17) is provided with an electromagnetic valve (18), and the control end of the electromagnetic valve (18) is electrically connected to the controller. 2. The flat flame burner with automatic ignition and flame detection device according to claim 1, characterized in that: the gas nozzle flame stabilizer (3) is a cap-shaped structure with one end open and one end closed, and the open end is connected to the The gas core pipe (5) is connected, and the closed end is provided with a concave brim, and a ring hole with an opening perpendicular to the axial direction is provided between the brim and the air distribution plate (4). 3. The flat-flame burner with automatic ignition and flame detection device according to claim 1, characterized in that: a burner duct is arranged between the nozzle of the burner brick (1) and the air distribution plate (4) (2), the burner conduit (2) is embedded in the nozzle on the small diameter side of the burner brick (1). 4. The flat-flame burner with automatic ignition and flame detection device according to claim 1, characterized in that: the air pipe casing (6) and the gas pipe casing (8) are respectively equipped with first pressure gas Mouth (7), the second getting pressure gas nozzle (21), all connected with pressure gauge at getting pressure gas nozzle place. 5. The flat-flame burner with automatic ignition and flame detection device according to claim 1, characterized in that: the end surface of the gas pipe shell (8) has a peephole, and a peephole is provided at the peephole. 6. The flat flame burner with automatic ignition and flame detection device according to claim 1, characterized in that: the gas pipeline (17) and the air pipeline (20) are provided with hand valves. 7. The flat flame burner with automatic ignition and flame detection device according to claim 1, characterized in that: a fixed plate is arranged between the burner brick (1) and the air duct housing (6), and the fixed plate Weld the anchor nails with the burner brick (1).

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