Gas fuel burner with long and short double flame, method for controlling the same and heating furnace

Abstract

The application discloses a gas fuel burner with long and short double flames, a control method thereof and a heating furnace. The gas fuel burner with long and short double flames comprises an air inlet main pipeline, a fuel inlet main pipeline, a short flame fuel nozzle, a short flame air nozzle, a long flame fuel nozzle and a long flame air nozzle. The air inlet main pipeline is communicated with the short flame air nozzle and the long flame air nozzle, and the fuel inlet main pipeline is communicated with the short flame fuel nozzle and the long flame fuel nozzle. The gas flow rate of the short flame fuel nozzle is controlled to be 15 m / s-25 m / s, and the air flow rate of the short flame air nozzle is controlled to be 20 m / s-40 m / s. The gas flow rate of the long flame fuel nozzle is controlled to be 25 m / s-100 m / s, and the air flow rate of the long flame air nozzle is controlled to be 40 m / s-100 m / s. The gas fuel burner can provide long flames and short flames at the same time, so that the steel billets can be uniformly heated.

Description

Technical Field

[0001] This invention relates to the field of burner technology, and in particular to a gas fuel burner with long and short dual flames, its control method, and a heating furnace. Background Technology

[0002] Heating furnaces are major energy-consuming equipment in the metallurgical industry, used to heat steel billets to a suitable and uniform temperature. The purpose is to improve the ductility of the steel, prevent deformation during rolling, and thus affect the quality and yield of the steel. The burner is the core equipment in the heating furnace; its performance directly affects economic performance indicators such as the temperature uniformity of the heated steel billets, furnace energy consumption, and pollutant emission levels.

[0003] Currently, conventional burners produce a single flame, which causes uneven heat distribution along the length of the flame. In particular, the temperature at the flame front is much higher than that at the flame root. This uneven temperature distribution can easily cause problems such as "waves" in the steel billet, leading to a decrease in the quality of the heated steel billet. Summary of the Invention

[0004] The main objective of this invention is to provide a gas fuel burner with both long and short flames, its control method, and a heating furnace, which aims to provide both long and short flames simultaneously to uniformly heat the steel billet.

[0005] To achieve the above objectives, the present invention provides a gas fuel burner with both long and short flames, comprising an air intake main pipe, a fuel intake main pipe, a short flame gas nozzle, a short flame air nozzle, a long flame gas nozzle, and a long flame air nozzle, wherein,

[0006] Both the main air intake pipe and the main fuel intake pipe are equipped with flow rate control devices and flow adjustment devices. The main air intake pipe is connected to the short flame air nozzle and the long flame air nozzle, and the main fuel intake pipe is connected to the short flame gas nozzle and the long flame gas nozzle. The gas flow rate of the short flame gas nozzle is controlled to be 15m / s to 25m / s, and the air flow rate of the short flame air nozzle is controlled to be 20m / s to 40m / s to form a short flame. The gas flow rate of the long flame gas nozzle is controlled to be 25m / s to 100m / s, and the air flow rate of the long flame air nozzle is controlled to be 40m / s to 100m / s to form a long flame.

[0007] Preferably, the short flame air nozzle is sleeved outside the short flame gas nozzle and a gap is provided between the two; the long flame air nozzle is sleeved outside the long flame gas nozzle and a gap is provided between the two.

[0008] Preferably, the gas fuel burner with long and short dual flames further includes a first air intake branch pipe and a second air intake branch pipe connected to the main air intake pipe, and the first air intake branch pipe and the second air intake branch pipe are respectively connected to the long flame air nozzle and the short flame air nozzle.

[0009] Preferably, the gas fuel burner with long and short dual flames further includes a first gas intake branch pipe and a second gas intake branch pipe connected to the main fuel intake pipe, and the first gas intake branch pipe and the second gas intake branch pipe are respectively connected to the long flame gas nozzle and the short flame gas nozzle.

[0010] Preferably, the first gas intake pipe passes through the first air intake pipe and its end is connected to the long flame gas nozzle; the second gas intake pipe passes through the second air intake pipe and its end is connected to the short flame gas nozzle.

[0011] Preferably, the connection between the first gas intake pipe and the long flame gas nozzle is made by a constricted pipe, and the connection between the first air intake pipe and the long flame air nozzle is made by a constricted pipe; the connection between the second gas intake pipe and the short flame gas nozzle is made by a constricted pipe, and the connection between the second air intake pipe and the short flame air nozzle is made by a constricted pipe.

[0012] Preferably, the long flame air nozzle is provided with a long flame stabilizing chamber and a long flame expanding chamber in sequence on its exterior, and the short flame air nozzle is provided with a short flame stabilizing chamber and a short flame expanding chamber in sequence on its exterior. Both the long flame expanding chamber and the short flame expanding chamber are flared structures, and both the long flame stabilizing chamber and the short flame stabilizing chamber are cylindrical cavity structures.

[0013] Preferably, the diameter of the end face at the free end of the long flame expansion cavity is 3-6 times the diameter of the end face at the free end of the short flame expansion cavity.

[0014] The present invention further proposes a heating furnace, including the above-mentioned gas fuel burner with long and short dual flames.

[0015] The present invention further proposes a control method for a gas fuel burner with both long and short flames, comprising the following steps:

[0016] The length of the short flame is adjusted by adjusting the gas flow rate of the gas nozzle and the air flow rate of the air nozzle. The length of the long flame is adjusted by adjusting the gas flow rate of the gas nozzle and the air flow rate of the air nozzle. The length of the long flame is controlled to be 4-8 times that of the short flame.

[0017] The width of the short flame is adjusted by adjusting the gas flow rate of the gas nozzle and the air flow rate of the air nozzle. The width of the long flame is adjusted by adjusting the gas flow rate of the gas nozzle and the air flow rate of the air nozzle.

[0018] The gas fuel burner with both long and short flames proposed in this invention achieves a short flame by controlling the flow rates of the fluids in the short flame gas nozzle and the short flame air nozzle, and a long flame by controlling the flow rates of the fluids in the long flame gas nozzle and the long flame air nozzle. This results in a burner simultaneously possessing both long and short flames, thus improving the temperature uniformity within the heating furnace and optimizing the temperature uniformity of the heated steel billet, thereby improving the billet quality. Furthermore, this burner has a simple structure, without complex or special devices, making it easy to operate and maintain. It allows for arbitrary adjustment of the air and fuel flow rates entering the long and short flame pipes, and has a wide operating range and strong adaptability. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the gas fuel burner with long and short flames of the present invention.

[0020] In the diagram, 1-fuel intake main pipe, 2-fuel regulating baffle, 3-air intake main pipe, 4-air regulating baffle, 5-long flame air chamber, 6-short flame air intake channel, 7-short flame air chamber, 8-first gas intake branch pipe, 9-second gas intake branch pipe, 10-long flame air nozzle, 11-long flame gas nozzle, 12-long flame stabilizing chamber, 13-long flame expansion chamber, 14-short flame air nozzle, 15-short flame gas nozzle, 16-short flame stabilizing chamber, 17-short flame expansion chamber.

[0021] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0022] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0023] It should be noted that in the description of this invention, the terms "lateral," "longitudinal," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] This invention proposes a gas fuel burner with both long and short flames.

[0025] Reference Figure 1 In this preferred embodiment, a gas fuel burner with both long and short flames includes an air intake main pipe 3, a fuel intake main pipe 1, a short flame gas nozzle 15, a short flame air nozzle 14, a long flame gas nozzle 11, and a long flame air nozzle 10, wherein...

[0026] Both the air intake main pipe 3 and the fuel intake main pipe 1 are equipped with flow rate control devices and flow adjustment devices. The air intake main pipe 3 is connected to the short flame air nozzle 14 and the long flame air nozzle 10, and the fuel intake main pipe 1 is connected to the short flame gas nozzle 15 and the long flame gas nozzle 11. The gas flow rate of the short flame gas nozzle 15 is controlled to be 15m / s to 25m / s, and the air flow rate of the short flame air nozzle 14 is controlled to be 20m / s to 40m / s to form a short flame. The gas flow rate of the long flame gas nozzle 11 is controlled to be 25m / s to 100m / s, and the air flow rate of the long flame air nozzle 10 is controlled to be 40m / s to 100m / s to form a long flame.

[0027] The gas introduced into the main fuel inlet pipe 1 can be natural gas, blast furnace gas, or other gas sources, making it suitable for various commonly used fuels and offering a wide range of applicability and operating conditions. The flow rate control device and flow regulation device can be manually or electronically adjusted. Electronic adjustment requires automatic control based on the actual operating load of the burner in the burner control system, increasing the automation level of the equipment. In this embodiment, the flow rate control device uses a baffle to adjust the flow rate.

[0028] In this embodiment, the short flame air nozzle 14 is sleeved outside the short flame gas nozzle 15 and there is a gap between them; the long flame air nozzle 10 is sleeved outside the long flame gas nozzle 11 and there is a gap between them.

[0029] Furthermore, the gas fuel burner with both long and short flames also includes a first air intake branch pipe (i.e., the long flame air chamber 5) and a second air intake branch pipe connected to the main air intake pipe 3. The first and second air intake branch pipes are respectively connected to the long flame air nozzle 10 and the short flame air nozzle 14. In this embodiment, the short flame air chamber and the short flame air intake channel together form the first air intake branch pipe.

[0030] Furthermore, the gas fuel burner with long and short flames also includes a first gas intake branch pipe 8 and a second gas intake branch pipe 9 connected to the fuel intake main pipe 1. The first gas intake branch pipe 8 and the second gas intake branch pipe 9 are respectively connected to the long flame gas nozzle 11 and the short flame gas nozzle 15.

[0031] The first gas intake pipe 8 is installed inside the first air intake pipe and its end is connected to the long flame gas nozzle 11; the second gas intake pipe 9 is installed inside the second air intake pipe and its end is connected to the short flame gas nozzle 15.

[0032] Furthermore, the connection between the first gas intake pipe 8 and the long flame gas nozzle 11 is made using a constricted pipe (i.e., the pipe diameter narrows on the side near the long flame gas nozzle 11), and the connection between the first air intake pipe and the long flame air nozzle 10 is made using a constricted pipe; the connection between the second gas intake pipe 9 and the short flame gas nozzle 15 is made using a constricted pipe, and the connection between the second air intake pipe and the short flame air nozzle 14 is made using a constricted pipe.

[0033] Furthermore, a long flame stabilizing chamber 12 and a long flame expanding chamber 13 are sequentially arranged outside the long flame air nozzle 10, and a short flame stabilizing chamber 16 and a short flame expanding chamber 17 are sequentially arranged outside the short flame air nozzle 14. Both the long flame expanding chamber 13 and the short flame expanding chamber 17 are flared structures (i.e., the pipe diameter widens on the side away from the corresponding stabilizing chamber 16), and both the long flame stabilizing chamber 12 and the short flame stabilizing chamber 16 are cylindrical cavity structures.

[0034] In this embodiment, the diameter of the end face at the free end of the long flame expansion cavity 13 (the free end is the end facing away from the side of the long flame stabilizing cavity 12) is 3-6 times the diameter of the end face at the free end of the short flame expansion cavity 17.

[0035] The gas fuel burner with both long and short flames is installed on the side wall of the heating furnace and arranged in parallel with the steel billet being heated.

[0036] During operation, fuel enters the first gas intake branch pipe 8 and the second gas intake branch pipe 9 through the fuel intake main pipe 1 and after being regulated by the fuel regulating baffle. Air enters the corresponding air nozzles through the air intake main pipe 3, the first air intake branch pipe, and the second air intake branch pipe. Fuel in the second gas intake branch pipe 9 is ejected through the long flame gas nozzle 11, where it mixes thoroughly with the air ejected through the long flame air nozzle 10 to form a long flame. Fuel in the second gas intake branch pipe 9 is ejected through the short flame gas nozzle 15, where it mixes thoroughly with the air ejected through the short flame air nozzle 14 to form a short flame. The length of the long flame is controlled to be 4-8 times that of the short flame to further improve the temperature uniformity in the heating furnace.

[0037] The gas fuel burner with both long and short flames proposed in this embodiment achieves this dual-flame design by controlling the flow rates of the fluids in the short-flame gas nozzle 15 and the short-flame air nozzle 14 to form a short flame, and by controlling the flow rates of the fluids in the long-flame gas nozzle 11 and the long-flame air nozzle 10 to form a long flame. This results in a burner that simultaneously possesses both long and short flames, thus improving the temperature uniformity within the heating furnace and optimizing the temperature uniformity of the heated steel billet, thereby improving the billet quality. Furthermore, this burner has a simple structure, without complex or special devices, making it easy to operate and maintain. It allows for arbitrary adjustment of the air and fuel flow rates entering the long and short flame pipes, offering a wide operating range and strong adaptability.

[0038] The present invention further proposes a heating furnace.

[0039] In this preferred embodiment, a heating furnace includes a gas fuel burner with both long and short flames. The specific structure and beneficial effects of the gas fuel burner are the same as those described in the above embodiments, and will not be repeated here.

[0040] The present invention further proposes a control method for a gas fuel burner with both long and short flames.

[0041] In this preferred embodiment, a control method based on the above-mentioned gas fuel burner with long and short dual flames includes the following steps:

[0042] The length of the short flame is adjusted by adjusting the gas flow rate of the gas nozzle 15 and the air flow rate of the air nozzle 14. The length of the long flame is adjusted by adjusting the gas flow rate of the gas nozzle 11 and the air flow rate of the air nozzle 14. The length of the long flame is controlled to be 4-8 times that of the short flame.

[0043] The width of the short flame is adjusted by adjusting the gas flow rate of the gas nozzle 15 and the air flow rate of the air nozzle 14. The width of the long flame is adjusted by adjusting the gas flow rate of the gas nozzle 11 and the air flow rate of the air nozzle 14.

[0044] Controlling the length of the long flame to be 4-8 times that of the short flame can further improve the temperature uniformity in the heating furnace.

[0045] By adjusting the length and width of the long and short flames, the temperature uniformity within the heating furnace can be improved, thereby optimizing the temperature uniformity of the heated steel billet and improving the billet quality.

[0046] The above are merely preferred embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A gas fuel burner with both long and short flames, characterized in that, This includes the main air intake duct, the main fuel intake duct, the short-flame gas nozzle, the short-flame air nozzle, the long-flame gas nozzle, and the long-flame air nozzle, among which, Both the main air intake duct and the main fuel intake duct are equipped with flow rate control devices and flow adjustment devices. The main air intake duct is connected to both a short-flame air nozzle and a long-flame air nozzle, and the main fuel intake duct is connected to both a short-flame gas nozzle and a long-flame gas nozzle. The gas flow rate of the short-flame gas nozzle is controlled to be 15 m / s to 25 m / s, and the air flow rate of the short-flame air nozzle is controlled to be 20 m / s to 40 m / s to form a short flame. The gas flow rate of the long-flame gas nozzle is controlled to be 25 m / s to 100 m / s, and the air flow rate of the long-flame air nozzle is controlled to be 40 m / s to 100 m / s. The speed of the flame is m / s, which forms a long flame; the short flame air nozzle is sleeved outside the short flame gas nozzle and there is a gap between them; the long flame air nozzle is sleeved outside the long flame gas nozzle and there is a gap between them; a long flame stabilizing chamber and a long flame expanding chamber are arranged in sequence outside the long flame air nozzle, and a short flame stabilizing chamber and a short flame expanding chamber are arranged in sequence outside the short flame air nozzle. Both the long flame expanding chamber and the short flame expanding chamber are flared structures, and both the long flame stabilizing chamber and the short flame stabilizing chamber are cylindrical cavity structures; the flame air nozzle and the short flame air nozzle are arranged side by side and independently.

2. The gas fuel burner with long and short flames as described in claim 1, characterized in that, It also includes a first air intake branch pipe and a second air intake branch pipe connected to the main air intake pipe, and the first air intake branch pipe and the second air intake branch pipe are respectively connected to the long flame air nozzle and the short flame air nozzle.

3. The gas fuel burner with long and short flames as described in claim 1, characterized in that, It also includes a first gas intake branch pipe and a second gas intake branch pipe connected to the fuel intake main pipe, and the first gas intake branch pipe and the second gas intake branch pipe are respectively connected to the long flame gas nozzle and the short flame gas nozzle.

4. The gas fuel burner with long and short flames as described in claim 3, characterized in that, The first gas intake branch pipe passes through the first air intake branch pipe and its end is connected to the long flame gas nozzle; the second gas intake branch pipe passes through the second air intake branch pipe and its end is connected to the short flame gas nozzle.

5. The gas fuel burner with long and short flames as described in claim 4, characterized in that, The first gas intake pipe is connected to the long flame gas nozzle by a constricted pipe, and the first air intake pipe is connected to the long flame air nozzle by a constricted pipe; the second gas intake pipe is connected to the short flame gas nozzle by a constricted pipe, and the second air intake pipe is connected to the short flame air nozzle by a constricted pipe.

6. The gas fuel burner with long and short flames as described in claim 1, characterized in that, The diameter of the end face at the free end of the long flame expansion cavity is 3-6 times the diameter of the end face at the free end of the short flame expansion cavity.

7. A heating furnace, characterized in that, Including a gas fuel burner with long and short flames as described in any one of claims 1 to 6.

8. A control method for a gas fuel burner with long and short dual flames as described in any one of claims 1 to 6, characterized in that, Includes the following steps: The length of the short flame is adjusted by adjusting the gas flow rate of the gas nozzle and the air flow rate of the air nozzle. The length of the long flame is adjusted by adjusting the gas flow rate of the gas nozzle and the air flow rate of the air nozzle. The length of the long flame is controlled to be 4-8 times that of the short flame. The width of the short flame is adjusted by adjusting the gas flow rate of the gas nozzle and the air flow rate of the air nozzle. The width of the long flame is adjusted by adjusting the gas flow rate of the gas nozzle and the air flow rate of the air nozzle.

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