Burner of steel rolling heating furnace

Abstract

The utility model belongs to the technical field of steel rolling heating, and particularly discloses a steel rolling heating furnace burner which comprises a shell, a fuel inlet, an air inlet, a gas spray pipe and an air spray pipe, the fuel inlet is connected to the top end of the shell through a flange, the air inlet is welded to the side face of the shell, and the gas spray pipe and the air spray pipe are arranged in the shell. A vortex area is arranged at the tail end of the gas spraying pipe, and a peeping pipe is further arranged on the shell and leads to the vortex area from the outer side of the shell. An existing ignition burner is prone to flameout due to the fact that air is arranged on the periphery of the burner, coal gas is arranged in a center hole of the burner, flames of the ignition burner are prone to being blown out by strong air flow on the periphery of a nozzle of the burner, and therefore the flames of the ignition burner need to be high in rigidity and penetrate through the air flow to reach the center of the nozzle to ignite the coal gas. The sighting tube is led to the vortex area, a fire source is sucked into the furnace through negative pressure formed in the vortex area, ignition operation is simplified, and the ignition success rate is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of steel rolling heating, in particular to a burner of a steel rolling heating furnace. Background Art

[0002] Steel rolling mill heating furnaces are high-temperature furnaces, reaching temperatures between 1000°C and 1300°C. They operate continuously, shutting down once or twice a year based on demand. These shutdowns are primarily for refractory repair and slag removal from the furnace bottom. Heating furnaces typically use a self-produced mixed gas as their combustion medium. This mixed gas can spontaneously ignite at temperatures above 800°C. Therefore, regardless of whether the furnace utilizes pulse burners or conventional burners, ignition is safe during normal production. Ignition can be achieved by simply opening the air and gas valves and allowing gas to flow into the furnace. Therefore, burners in heating furnaces are typically not equipped with online ignition devices.

[0003] In recent years, the burner's peephole has been enlarged and thickened, with a special ignition torch (ignition burner) inserted through the peephole tube to ignite the burner. This method can ignite the main burner in any position, but it requires the burner to have a thick peephole and a special ignition burner that is difficult to extinguish. The heating furnace piping configuration also requires a dedicated air and gas piping system designed for the ignition burner. The advantage of this ignition method is that it can meet all the requirements for furnace startup. The disadvantages are that the system is complex, expensive, and inflexible. It requires a dedicated burner, a dedicated ignition burner, and a dedicated air and gas piping system. The reason why the ignition burner is easy to flame out is that the burner is designed with air on the periphery and gas in the center hole. The ignition burner flame is easily blown out by the strong air flow at the periphery of the burner nozzle. Therefore, the ignition burner flame must be very rigid to penetrate the air flow to reach the center of the nozzle to ignite the gas. Utility Model Content

[0004] The utility model aims to provide a steel rolling heating furnace burner to solve the problem that the ignition operation part is flexible and the flame rigidity of the ignition burner is required to be very strong.

[0005] To achieve the above-mentioned purpose, the basic solution provided by the present invention is: a steel rolling heating furnace burner, comprising a shell, a fuel inlet, an air inlet, a gas nozzle and an air nozzle, wherein the fuel inlet is connected to the top of the shell through a flange, the air inlet is welded to the side of the shell, the gas nozzle and the air nozzle are inside the shell, a vortex zone is provided at the end of the gas nozzle, and a peep tube is also provided on the shell, which leads to the vortex zone from the outside of the shell.

[0006] The principle and beneficial effects of this utility model are as follows: when gas is ejected from the air or gas nozzle, a negative pressure zone forms around the base of the nozzle. A vortex zone is formed in the root area between the air and gas nozzles. Air and gas mix in this negative pressure vortex zone to form a mixed gas. A peep tube is inserted obliquely from the outside of the burner into the vortex zone around the gas nozzle. The fire source is drawn into the vortex zone through the peep tube by the negative pressure. The vortex zone is then filled with gas, air, and fire, allowing successful ignition. This simplifies the ignition operation and eliminates the need to insert a torch into the peep tube, making the operation safer.

[0007] Option 2, which is a preferred alternative to the basic option, further includes a secondary air nozzle within the housing, the tip of which is provided with a secondary vortex zone. The addition of the secondary vortex zone allows for more complete mixing of gas and air, increases the success rate of ignition, and ensures more complete combustion.

[0008] Option 3, a preferred alternative to the basic option, features an air conditioning plate within the air inlet, a regulating switch extending through the hollow housing, and a connection to the air conditioning plate. Air for both the air nozzle and the secondary air nozzle originates from the air inlet. Turning the regulating switch allows for simultaneous adjustment of the airflow volume of both nozzles. Adjusting the airflow volume of both nozzles allows for the position and size of the vortex to be adjusted based on actual usage, increasing ignition success rates and enabling real-time adjustments to combustion conditions.

[0009] Option 4, a preferred alternative to the basic option, hinges the peephole inlet with a protective cover, which is lined with a refractory material layer. Because the peephole faces the vortex zone, when the burner's mixed gas velocity is too low, the pressure wave generated by the combustion may cause the flame to propagate in the opposite direction, potentially entering the peephole. A protective cover with a refractory material layer closes the peephole after ignition is complete to prevent flame ejection and increase operational safety.

[0010] Option 5, which is a preferred option of the basic option, is that the vortex zone and the secondary vortex zone are trumpet-shaped cavities that gradually expand from the inside to the outside. This shape is biased towards forming a vortex and causing the fire source to expand and spray out. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a structural diagram of a steel rolling heating furnace burner of the utility model;

[0012] Figure 2 The utility model is a schematic diagram of the installation of a burner of a steel rolling heating furnace. DETAILED DESCRIPTION

[0013] The present invention is further described in detail below through specific implementation methods:

[0014] The figure marks in the drawings of the specification include: 1-shell, 2-fuel inlet, 3-air inlet, 4-gas nozzle, 5-air nozzle, 6-vortex zone, 7-peep tube, 8-secondary air nozzle, 9-secondary vortex zone, 10-air adjustment plate, 11, adjustment switch, 12-protective cover, 13-refractory material layer.

[0015] Example

[0016] like Figure 1 and Figure 2 As shown: A steel rolling heating furnace burner, comprising a shell 1, a fuel inlet 2, an air inlet 3, a gas nozzle 4 and an air nozzle 5. The fuel inlet 2 is connected to the top of the shell 1 through a flange, and the air inlet 3 is welded to the side of the shell 1. An air adjustment plate 10 is provided in the air inlet 3. An adjustment switch 11 is passed through the shell 1, and the adjustment switch 11 is connected to the air adjustment plate 10. The gas nozzle 4 and the air nozzle 5 are in the shell 1, the gas nozzle 4 is in the center, and the air nozzle 5 is on both sides of the gas nozzle 4. The air nozzle 5 is tilted to the center, and a vortex zone 6 is provided at the end of the gas nozzle 4 and the air nozzle 5. A peep tube 7 is provided on the shell 1, which leads from the outside of the shell 1 to the vortex zone 6. A protective cover 12 is provided at the inlet of the peep tube 7, and a refractory material layer 13 is provided in the protective cover 12. There is also a secondary air nozzle 8 on the outside of the air nozzle 5, and a secondary vortex zone 9 is provided at the end of the secondary air nozzle 8. The vortex zone 6 and the secondary vortex zone 9 are trumpet-shaped cavities that gradually open from the inside to the outside.

[0017] The implementation method of this embodiment is as follows: when igniting, the protective cover 12 is first opened, and then the burner air valve controlling the air nozzle is opened to allow air to be ejected, forming a negative pressure vortex zone in the vortex zone 6 and the secondary vortex zone 9, and the fire source is ignited. The fire source can be a lit cloth strip or paper ball, which is inserted into the inlet of the peep tube 7. At the same time, the gas valve controlling the gas nozzle 4 is opened, and the burner can be ignited smoothly. After ignition, the burner is observed through the peep tube 7, and the combustion state is adjusted by adjusting the air adjustment plate 10. Finally, the protective cover 12 is covered.

[0018] The above is only an embodiment of the present invention, and the commonly known specific structures and characteristics of the scheme are not described in detail here. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, and these should also be regarded as the scope of protection of the present invention. These will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection claimed by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A steel rolling heating furnace burner, characterized in that: The invention comprises a shell (1), a fuel inlet (2), an air inlet (3), a gas nozzle (4) and an air nozzle (5); the fuel inlet (2) is connected to the top of the shell (1) via a flange; the air inlet (3) is welded to the side of the shell (1); the gas nozzle (4) and the air nozzle (5) are inside the shell (1); a vortex zone (6) is provided at the end of the gas nozzle (4); a peep tube (7) is further provided on the shell (1); the peep tube (7) leads from the outside of the shell (1) to the vortex zone (6).

2. A steel rolling heating furnace burner according to claim 1, characterized in that A secondary air nozzle (8) is also provided in the housing (1), and a secondary vortex zone (9) is provided at the end of the secondary air nozzle (8).

3. The steel rolling heating furnace burner according to claim 1, characterized in that: An air conditioning plate (10) is provided in the air inlet (3), and an adjustment switch (11) is passed through the housing (1), and the adjustment switch (11) is connected to the air conditioning plate (10).

4. The steel rolling heating furnace burner according to claim 1, characterized in that: The inlet of the peep tube (7) is hinged with a protective cover (12), and a refractory material layer (13) is provided on the inner side of the protective cover (12).

5. The steel rolling heating furnace burner according to claim 1, characterized in that The eddy current zone (6) and the secondary eddy current zone (9) are trumpet-shaped cavities that gradually expand from the inside to the outside.

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