Long and short flame combined flameless burner

Abstract

The invention belongs to the technical field of combustors, and discloses a long and short flame combined flameless combustor which is provided with a wind shell, a gas inlet channel and an air inlet channel are arranged outside the wind shell, and a long flame air inlet channel and a short flame air inlet channel are arranged in the wind shell. A long flame gas spray gun is arranged in the long flame air inlet channel, a first gas mixing device is arranged on the burner block between the right end of the long flame air inlet channel and the long flame gas spray gun, and a short flame gas spray gun is arranged in the short flame air inlet channel. A second gas mixing device is arranged between the right end of the short flame air inlet channel and the short flame gas spray gun; the long and short flame capacity is convenient to adjust, the wide furnace profile is more uniform in furnace temperature in the furnace width direction, the combustion stability is better, the preheating air temperature is 500 DEG C or below, and NOx can be discharged at the furnace temperature of 1300 DEG C; the NOx emission result of the existing steel rolling heating furnace is met; 150 mg / m < 3 >.

Description

Technical Field

[0001] The invention belongs to the technical field of burners, and in particular discloses a long-short flame combined flameless burner, which has the advantages of convenient adjustment of the long and short flames, more uniform furnace temperature in the furnace width direction, better combustion stability, and a preheated air temperature of 500°C or below, which can make the NOx emission less than 120mg / m at a furnace temperature of 1300°C. 3 , meeting the NOx emission of existing steel rolling heating furnace <150mg / m 3 Require. Background Art

[0002] At present, in heating furnaces and heat treatment furnaces in some industries, due to the wide width of the furnace, most of the burner flames are not long enough, which makes the center temperature in the furnace uneven, resulting in different heating temperatures of steel parts. Therefore, it is necessary to install a flat flame burner on the furnace top to create a uniform temperature field in a fairly large plane. However, installing a flat flame burner on the furnace top has both advantages and disadvantages. Since the burner bricks of the flat flame burner are large, the weight of the burner is very heavy, which requires structural reinforcement of the flat flame burner on the furnace top. In addition, due to the high temperature of the furnace top, workers cannot work on the furnace top, which is not conducive to the real-time operation and adjustment of the burner. In addition, after the flat flame burner is installed on the furnace top, the heat dissipation loss of the furnace top is increased. Based on the above reasons, our company has designed and developed this long and short flame combined flameless burner, which meets the combustion and heating requirements of wide furnaces after removing the flat flame burner on the furnace top.

[0003] In the prior art, CN115727328A 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 intake main pipeline, a fuel intake main pipeline, a short flame gas nozzle, a short flame air nozzle, a long flame gas nozzle, and a long flame air nozzle, wherein the air intake main pipeline is connected to the short flame air nozzle and the long flame air nozzle, and the fuel intake main pipeline is connected to the short flame gas nozzle and the long flame gas nozzle.

[0004] The above-mentioned prior art has the following defects: 1. It is impossible to observe the flame state in the furnace in real time; 2. The fuel regulating baffle is located in the fuel air intake main pipeline, and the flow rate of the gas in the first gas air intake branch pipeline and the second gas air intake branch pipeline cannot be separately adjusted; the air regulating baffle is located on the air intake main pipeline, and the flow rate of the air in the long flame air cavity and the short flame air cavity cannot be separately adjusted. Summary of the invention

[0005] In order to solve the above problems, the purpose of the present invention is to disclose a flameless burner combined with a long and short flame. The long flame selects the required air and gas pressure according to the furnace width design, so that the long flame forms a flame-off combustion state. At the same time, the long flame airflow can entrain low-oxygen furnace gas in the furnace to reduce NOx generation, and flameless combustion can be achieved under high temperature conditions. The short flame can make up for the combustion space formed by the long flame's flame-off, and at the same time, the long flame's root ignition can be combined to make the long flame burn stably. It is achieved by adopting the following technical solutions.

[0006] A long-short flame combined flameless burner comprises a wind shell, a gas inlet passage and an air inlet passage are arranged outside the wind shell, a long-flame air inlet passage and a short-flame air inlet passage are arranged inside the wind shell, and the left end of the long-flame air inlet passage and the left end of the short-flame air inlet passage are respectively connected to the same end of the air inlet passage; A long flame gas spray gun is provided in the long flame air intake passage, a first gas mixing device is provided between the right end of the long flame air intake passage and the long flame gas spray gun, a short flame gas spray gun is provided in the short flame air intake passage, a second gas mixing device is provided between the right end of the short flame air intake passage and the short flame gas spray gun; The left end of the long flame gas spray gun and the left end of the short flame gas spray gun are respectively communicated with the same end of the gas inlet passage.

[0007] The above-mentioned long-short flame combined flameless burner, the first mixing device is composed of a long flame air small angle swirl disk and a positioning sleeve, the right end of the long flame air inlet channel is fixed to the long flame gas spray gun by the positioning sleeve, the long flame gas spray gun is located in the middle of the long flame air inlet channel, a long flame air small angle swirl disk is provided in the positioning sleeve, and the long flame air small angle swirl disk is connected to the long flame gas spray gun shaft sleeve.

[0008] The above-mentioned long and short flame combined flameless burner, the second mixing device is composed of a short flame air secondary air eye brick and a short flame air primary air swirl disk, the short flame air secondary air eye brick is fixed to the short flame air inlet channel, the short flame air primary air swirl disk is located in the middle of the short flame air secondary air eye brick, the short flame air secondary air eye brick is provided with an eye connecting the short flame air inlet channel and the short flame air-gas mixed gas channel, the short flame air primary air swirl disk is connected to the short flame gas nozzle sleeve.

[0009] The long-short flame combined flameless burner described above has a burner brick at the right end of the wind shell, a long flame air-gas mixture passage in the shape of airflow contraction connected to the right end of the long flame air inlet passage, and a short flame air-gas mixture passage in the shape of flame diffusion trumpet connected to the right end of the short flame air inlet passage; In the long-short flame combined flameless burner described above, an auxiliary ignition burner connected to the short-flame air-gas mixture passage is also provided on the left side of the wind shell.

[0010] The above-mentioned long-short flame combined flameless burner has an L-shaped long flame air intake channel, an L-shaped short flame air intake channel, a horizontal section of the long flame air intake channel and a horizontal section of the short flame air intake channel parallel, a long flame gas spray gun is located in the horizontal section of the long flame air intake channel, and a short flame gas spray gun is located in the horizontal section of the short flame air intake channel, a left end of the long flame gas spray gun is connected to the lower end of the gas intake channel through an L-shaped long flame gas channel, a left end of the short flame gas spray gun is connected to the lower end of the gas intake channel through an L-shaped short flame gas channel, a long flame gas regulating valve is provided in the vertical section of the long flame gas channel, and a short flame gas regulating valve is provided in the vertical section of the short flame gas channel.

[0011] In the long-short flame combined flameless burner described above, a fire peep hole is respectively provided at the left end of the horizontal section of the long flame gas channel and the left end of the horizontal section of the short flame gas channel.

[0012] For the long-short flame combined flameless burner described above, the air pressure is selected to be 2000Pa~6000Pa according to the furnace width and the design pressure of the piping system.

[0013] For the long-short flame combined flameless burner described above, the gas pressure is selected to be 4000Pa~20000Pa according to the furnace width and the design pressure of the pipeline system.

[0014] The above-mentioned long-short flame combined with flameless burner has an air temperature design range of room temperature to 550°C.

[0015] The temperature design range of the fuel gas in the long-short flame combined flameless burner described above is from room temperature to 250°C.

[0016] In the above-mentioned long-short flame combined flameless burner, the gas introduced into the gas inlet passage can be low calorific value blast furnace gas, generator gas, mixed gas, coke oven gas, or high calorific value natural gas and liquefied petroleum gas.

[0017] This application has the following beneficial effects: 1. The long flame forms a flame-off combustion state. At the same time, the long flame airflow can draw low-oxygen furnace gas in the furnace to reduce NOx generation. When the furnace temperature is above 900°C, flameless combustion can be achieved, and the furnace temperature is more uniform.

[0018] 2. The short flame can make up for the combustion space formed by the long flame de-ignition, and at the same time ignite the root of the long flame to make the long flame burn stably.

[0019] 3. It is easy to adjust the length of the flame. The wide furnace has a more uniform furnace temperature in the width direction, better combustion stability, and the preheated air temperature is 500℃ or below, which can make the NOx emission less than 120mg / m at the furnace temperature of 1300℃. 3 , meeting the NOx emission of existing steel rolling heating furnace <150mg / m 3 Require.

[0020] 4. Flat flame burners are no longer installed on the furnace top, which reduces heat dissipation loss of the furnace top, makes the furnace top structure and construction simple, and is easy to install and use.

[0021] 5. Use long flame air small angle swirl disk, short flame air secondary air eye brick, short flame air primary air swirl disk, so that the gas on the short flame side and the gas on the long flame side can achieve long and short combined combustion, making the temperature uniform in the width direction of the furnace.

[0022] 6. The burner is integrated with an ignition gun and a fire peep hole to facilitate automated production.

[0023] 7. A long flame air regulating valve, a short flame air regulating valve, a long flame gas regulating valve and a short flame gas regulating valve are provided to facilitate the adjustment of the combustion capacity ratio of the long flame side and the short flame side according to requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a front view of an embodiment of the present invention.

[0025] Figure 2 Embodiment of the present invention Figure 1 Schematic diagram of the BB cross section.

[0026] Figure 3 Embodiment of the present invention Figure 1 AA section diagram in .

[0027] Figure 4 It is a left side view of an embodiment of the present invention.

[0028] Figure 5 It is a schematic diagram of the internal structure of the embodiment of the present invention when it is working.

[0029] In the figure, the names of the figures corresponding to the figure numbers are: 1. gas intake channel, 2. short flame air-gas mixture channel, 3. air intake channel, 4. long flame air intake channel, 5. long flame air regulating valve, 6. short flame air intake channel, 7. short flame air regulating valve, 8. auxiliary ignition burner, 9. long flame gas spray gun, 10. wind shell, 11. long flame gas channel, 12. short flame gas spray gun, 14. positioning sleeve, 15. long flame air small angle swirl disk, 16. long flame gas nozzle, 17. long flame air-gas mixture channel, 18. burner brick, 19. short flame gas channel, 20. short flame air secondary air eye brick, 21. short flame air primary air swirl disk, 22. short flame gas nozzle, 23. long flame gas regulating valve, 24. short flame gas regulating valve, 25. peep hole. DETAILED DESCRIPTION

[0030] Example: Figures 1 to 4 A long-short flame combined flameless burner comprises a wind shell 10, a gas inlet passage 1 is provided on the upper left side of the wind shell 10, an air inlet passage 3 is provided above the wind shell 10, and a burner brick 18 is provided on the right side of the wind shell 10; An L-shaped long flame air intake passage 4 and an L-shaped short flame air intake passage 6 are provided in the air housing 10, the horizontal section of the long flame air intake passage 4 and the horizontal section of the short flame air intake passage 6 are parallel, the left end of the long flame air intake passage 4 and the left end of the short flame air intake passage 6 are both connected to the lower end of the air intake passage 3, a long flame air regulating valve 5 for regulating the air flow in the long flame air intake passage 4 is provided in the long flame air intake passage 4, and a short flame air regulating valve 7 for regulating the air flow in the short flame air intake passage 6 is provided in the short flame air intake passage 6; The burner brick 18 is provided with a long flame air-gas mixture passage 17 in the shape of air flow contraction and connected to the right end of the long flame air inlet passage 4, and a short flame air-gas mixture passage 2 in the shape of a flame diffusion trumpet and connected to the right end of the short flame air inlet passage 6; A long flame gas spray gun 9 is provided in the horizontal section of the long flame air inlet channel 4. The long flame gas spray gun 9 is located in the middle of the horizontal section of the long flame air inlet channel 4. A long flame gas nozzle 16 at the right end of the long flame gas spray gun 9 extends into the long flame air-gas mixture channel 17. A positioning sleeve 14 for fixing the long flame gas spray gun 9 is provided at the right end of the long flame air inlet channel 4. A long flame air small angle swirl disk 15 is provided in the positioning sleeve 14. The long flame air small angle swirl disk 15 is connected to the shaft sleeve of the long flame gas spray gun 9. A short flame gas spray gun 12 is provided in the horizontal section of the short flame air inlet channel 6, and the short flame gas spray gun 12 is located in the middle of the horizontal section of the short flame air inlet channel 6. A short flame gas nozzle 22 at the right end of the short flame gas spray gun 12 extends into the short flame air-gas mixture channel 2. A short flame air secondary air eye brick 20 is fixedly provided at the right end of the short flame air inlet channel 6. An eye connecting the short flame air inlet channel 6 and the short flame air-gas mixture channel 2 is provided on the short flame air secondary air eye brick 20. A short flame air primary air swirl disk 21 is provided in the middle of the short flame air secondary air eye brick 20. The short flame air primary air swirl disk 21 is connected to the shaft sleeve of the short flame gas nozzle 22. The left end of the long flame gas spray gun 9 is connected to the right end of an L-shaped long flame gas channel 11, and the left end of the short flame gas spray gun 12 is connected to the right end of an L-shaped short flame gas channel 19. The long flame gas channel 11 and the short flame gas channel 19 are located on the left side of the wind shell 10. The left end of the long flame gas channel 11 and the left end of the short flame gas channel 19 are both connected to the lower end of the gas inlet channel 1. The vertical section of the long flame gas channel 11 is provided with a long flame gas regulating valve 23, and the vertical section of the short flame gas channel 19 is provided with a short flame gas regulating valve 24. The left end of the horizontal section of the long flame gas channel 11 and the left end of the horizontal section of the short flame gas channel 19 are each provided with a fire peep hole 25; An auxiliary ignition burner 8 connected to the short flame air-gas mixture passage 2 is also provided on the left side of the wind housing 10 .

[0031] The air pressure of the long-short flame combined flameless burner described above is 3000Pa.

[0032] The above-mentioned long-short flame combined flameless burner has a gas pressure of 7000Pa.

[0033] The above-mentioned long and short flame combined flameless burner has an air temperature of 450°C. In the above-mentioned long-short flame combined with flameless burner, the temperature of the fuel gas is room temperature.

[0034] In the above-mentioned long-short flame combined with flameless burner, the gas introduced into the gas inlet passage 1 is natural gas.

[0035] Working principle: Principle of short flame burner: Gas enters from the gas inlet channel 1 and is divided into two paths. One path passes through the short flame gas regulating valve 24 and enters the short flame gas spray gun 12, and is sprayed out from the short flame gas nozzle 22. Air enters from the air inlet channel 3 and is also divided into two paths. One path passes through the short flame air regulating valve 7 and enters the short flame air inlet channel 6. It is further divided into two paths in the short flame air inlet channel 6. One path of air is sprayed out from the short flame air primary air swirl disk 21, and the other path of air is sprayed out from the short flame air secondary air eye brick 20. After the gas and air are sprayed out through the short flame gas nozzle 22, the short flame air secondary air eye brick 20, and the short flame air primary air swirl disk 21, they are fully mixed and burned in the short flame air-gas mixed gas channel 2 of the burner brick 18 and then enter the furnace.

[0036] Principle of long flame burner: after the gas enters the gas inlet channel 1, it passes through the long flame gas regulating valve 23 to enter the long flame gas spray gun 9 and is sprayed out from the long flame gas nozzle 16. After the air enters the air inlet channel 3, it passes through the long flame air regulating valve 5 to enter the long flame air inlet channel 4 and is sprayed out from the long flame air small angle swirl disk 15. Since the speed of the gas and air after being sprayed out from the long flame gas spray gun 9 and the long flame air small angle swirl disk 15 is very high, a small amount of gas is mixed in the long flame air-gas mixture channel 17 of the burner brick 18 and then directly enters the furnace to form a de-fired combustion state. At the same time, the long flame airflow can draw low-oxygen furnace gas in the furnace to reduce NOx generation.

[0037] The auxiliary ignition burner 8 can be used as an ignition source to ignite the short flame burner when the burner is started, thereby ensuring the combustion stability of the short flame burner during the temperature rise stage.

[0038] like Figure 5When in use, first start the auxiliary ignition burner 8. When the auxiliary ignition burner 8 works normally, open the air and gas valves, and the air and gas are ejected into the furnace through their respective channels inside the burner. Due to the auxiliary ignition burner 8, the short flame side burner is ignited first, and the flame is ejected from the nozzle of the short flame air-gas mixed gas channel 2 and mixed in the furnace near the nozzle to form a torch combustion. The flame length of the short flame side burner can be adjusted by the short flame gas regulating valve 24 and the short flame air regulating valve 7. At this time, the air and gas of the long flame side burner are also ejected from their respective channels inside the burner into the furnace, but because the flow rate of the long flame side burner nozzle is very high, the air and gas enter the furnace at a high speed, and then contact with the torch of the short flame side burner in the furnace to start burning, so the flame length formed in the furnace can be longer, which can ensure that the temperature of the center of the furnace is uniform even when the flat flame burner on the top of the furnace is not used. Since the long flame side burner gas diffuses and burns after entering the furnace at high speed, when the furnace temperature reaches above 900℃, the flame shape cannot be seen in the furnace through the fire peep hole 25, and the entire furnace appears red, forming a flameless combustion state. However, when the furnace temperature is lower than 900℃, the light blue torch shape of the short flame side burner can be clearly seen from the fire peep hole 25.

[0039] This application has the following beneficial effects: 1. The long flame forms a flame-off combustion state. At the same time, the long flame airflow can draw low-oxygen furnace gas in the furnace to reduce NOx generation. When the furnace temperature is above 900°C, flameless combustion can be achieved, and the furnace temperature is more uniform.

[0040] 2. The short flame can make up for the combustion space formed by the long flame de-ignition, and at the same time ignite the root of the long flame to make the long flame burn stably.

[0041] 3. It is easy to adjust the length of the flame. The wide furnace has a more uniform furnace temperature in the width direction, better combustion stability, and the preheated air temperature is 500℃ or below, which can make the NOx emission less than 120mg / m at the furnace temperature of 1300℃. 3 , meeting the NOx emission of existing steel rolling heating furnace <150mg / m 3 Require.

[0042] 4. Flat flame burners are no longer installed on the furnace top, which reduces heat dissipation loss of the furnace top, makes the furnace top structure and construction simple, and is easy to install and use.

[0043] 5. Use long flame air small angle swirl disk, short flame air secondary air eye brick, short flame air primary air swirl disk, so that the gas on the short flame side and the gas on the long flame side can achieve long and short combined combustion, making the temperature uniform in the width direction of the furnace.

[0044] 6. The burner is equipped with an ignition gun and a fire peep hole to facilitate automated production. 7. A long flame air regulating valve, a short flame air regulating valve, a long flame gas regulating valve and a short flame gas regulating valve are provided to facilitate the adjustment of the combustion capacity ratio of the long flame side and the short flame side according to requirements.

[0045] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limiting the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including the equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A long-short flame combined flameless burner, having a wind housing (10), characterized in that: A gas intake passage (1) and an air intake passage (3) are provided outside the wind housing (10), and a long flame air intake passage (4) and a short flame air intake passage (6) are provided inside the wind housing (10), and the left end of the long flame air intake passage (4) and the left end of the short flame air intake passage (6) are respectively connected to the same end of the air intake passage (3); A long flame gas spray gun (9) is provided in the long flame air intake passage (4), a first gas mixing device is provided between the right end of the long flame air intake passage (4) and the long flame gas spray gun (9), a short flame gas spray gun (12) is provided in the short flame air intake passage (6), and a second gas mixing device is provided between the right end of the short flame air intake passage (6) and the short flame gas spray gun (12); The left end of the long flame gas spray gun (9) and the left end of the short flame gas spray gun (12) are respectively connected to the same end of the gas inlet passage (1).

2. A long-short flame combined flameless burner according to claim 1, characterized in that: The first gas mixing device is composed of a long flame air small angle swirl disk (15) and a positioning sleeve (14); the right end of the long flame air inlet passage (4) is fixed to the long flame gas spray gun (9) through the positioning sleeve (14); the long flame gas spray gun (9) is located in the middle of the long flame air inlet passage (4); a long flame air small angle swirl disk (15) is arranged in the positioning sleeve (14); and the long flame air small angle swirl disk (15) is connected to the shaft sleeve of the long flame gas spray gun (9).

3. A long-short flame combined flameless burner according to claim 2, characterized in that: The second gas mixing device is composed of a short flame air secondary air eye brick (20) and a short flame air primary air swirl disk (21); the short flame air secondary air eye brick (20) is fixed to the short flame air inlet channel (6); the short flame air primary air swirl disk (21) is located in the middle of the short flame air secondary air eye brick (20); the short flame air secondary air eye brick (20) is provided with an eye connecting the short flame air inlet channel (6) and the short flame air-gas mixed gas channel (2); and the short flame air primary air swirl disk (21) is connected to the shaft sleeve of the short flame gas nozzle (22).

4. A long-short flame combined flameless burner according to claim 3, characterized in that: A burner brick (18) is provided at the right end of the wind housing (10), and a long flame air-gas mixture passage (17) in a gas flow contraction shape and connected to the right end of the long flame air inlet passage (4) is provided in the burner brick (18), and a short flame air-gas mixture passage (2) in a flame diffusion trumpet shape is provided.

5. A long-short flame combined flameless burner according to claim 4, characterized in that: An auxiliary ignition burner (8) connected to the short flame air-gas mixture passage (2) is also provided on the left side of the wind housing (10).

6. A long-short flame combined flameless burner according to claim 5, characterized in that: The long flame air intake channel (4) is L-shaped, and the short flame air intake channel (6) is L-shaped. The horizontal section of the long flame air intake channel (4) is parallel to the horizontal section of the short flame air intake channel (6). The long flame gas spray gun (9) is located in the horizontal section of the long flame air intake channel (4), and the short flame gas spray gun (12) is located in the horizontal section of the short flame air intake channel (6). The left end of the long flame gas spray gun (9) is connected to the lower end of the gas intake channel (1) through an L-shaped long flame gas channel (11), and the left end of the short flame gas spray gun (12) is connected to the lower end of the gas intake channel (1) through an L-shaped short flame gas channel (19). A long flame gas regulating valve (23) is provided in the vertical section of the long flame gas channel (11), and a short flame gas regulating valve (24) is provided in the vertical section of the short flame gas channel (19).

7. A long-short flame combined flameless burner according to claim 6, characterized in that: A fire peep hole (25) is respectively provided at the left end of the horizontal section of the long flame gas channel (11) and the left end of the horizontal section of the short flame gas channel (19).

8. The long-short flame combined flameless burner according to claim 7, characterized in that: The air pressure is selected from 2000Pa to 6000Pa according to the furnace width and the design pressure of the piping system, and the gas pressure is selected from 4000Pa to 20000Pa according to the furnace width and the design pressure of the piping system.

9. A long-short flame combined flameless burner according to claim 8, characterized in that: The design range of air temperature is from room temperature to 550℃, and the design range of gas temperature is from room temperature to 250℃.

10. A long-short flame combined flameless burner according to claim 9, characterized in that: The fuel gas introduced into the fuel gas inlet passage (1) is gas fuel.

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