Coal gas and natural gas dual-purpose heat accumulating type burner

Abstract

The utility model belongs to the technical field of burners, and discloses a coal gas and natural gas dual-purpose heat accumulating type burner which can independently use blast furnace coal gas and air for double preheating and can also use natural gas after the blast furnace coal gas and air for double preheating. Natural gas can be independently used without preheating through valve switching, and air is independently preheated. Comprising a burner body, an air heat storage cavity, a blast furnace gas heat storage cavity and a natural gas channel are formed in the burner body, an air heat storage body is arranged in the air heat storage cavity, and a blast furnace gas heat storage body is arranged in the blast furnace gas heat storage cavity; the end of the second side of the air heat storage cavity, the end of the second side of the blast furnace gas heat storage cavity and the end of the second side of the natural gas channel jointly communicate with a burner head mixing cavity, and the end of the second side of the burner head mixing cavity communicates with a burner head mixing nozzle. The utility model has the beneficial effects that the structure is compact, the mixing nozzle at the head of the burner is variable, and the natural gas can be partially or completely switched for use during the additional maintenance period of the blast furnace and when the blast furnace gas flow is insufficient.

Description

Technical Field

[0001] This utility model belongs to the field of burner technology, and in particular relates to a regenerative burner that can be used for both coal gas and natural gas. Background Technology

[0002] Traditional blast furnace gas burners typically employ a simple combustion method, resulting in uneven mixing of gas and air, incomplete combustion, and a large amount of chemical energy not being effectively converted into thermal energy, leading to energy waste.

[0003] Blast furnace gas has a low calorific value, resulting in a low combustion temperature. Without preheating, it cannot meet the process temperature requirements of industrial furnaces. Currently, most existing blast furnace gas and air dual preheating burners adopt a split structure, that is, the gas regenerator is a single burner, and the air regenerator is also a single burner. The two are grouped together to inject air and gas into the furnace to organize the flame for combustion. This structure results in the gas being discharged before complete combustion due to the small volume inside the furnace, causing energy waste.

[0004] In some special production heating processes, burners that can use both natural gas and blast furnace gas are required to meet the fuel switching requirements. Currently, regenerative burners are only available as single natural gas regenerative burners or blast furnace gas regenerative burners.

[0005] In the prior art, CN216521650U discloses a blast furnace gas and air combined dual regenerative low-NOx burner, including a combined housing, which is respectively embedded with a gas regenerative chamber and an air regenerative chamber extending into the combined housing. The front end of the gas regenerative chamber is provided with at least one gas passage penetrating the combined housing; the front end of the air regenerative chamber is provided with at least one air passage penetrating the combined housing; the external extension lines of the gas passage and the air passage can form an angle.

[0006] The aforementioned existing technologies have the following drawbacks: they cannot meet the requirement of dual use and switching between natural gas and blast furnace gas; they lack a gas mixing chamber, which may lead to incomplete gas combustion; they have a narrow range of applications; and they have low combustion efficiency. Utility Model Content

[0007] To address the aforementioned problems, the purpose of this utility model is to disclose a dual-use regenerative burner for both coal gas and natural gas, which is achieved through the following technical solution.

[0008] A dual-use regenerative burner for coal gas and natural gas has a burner body, an air regenerative chamber, a blast furnace gas regenerative chamber and a natural gas passage inside the burner body. The air regenerative chamber is provided with multiple air regenerative bodies, and an air inlet is connected to the end of the first side of the air regenerative chamber.

[0009] The blast furnace gas heat storage chamber is equipped with multiple blast furnace gas heat storage bodies, and the end of the first side of the blast furnace gas heat storage chamber is connected to a blast furnace gas inlet.

[0010] A natural gas inlet is connected to the first end of the natural gas channel;

[0011] The air storage chamber, the blast furnace gas storage chamber, and the second side of the natural gas passage are all connected to a burner head mixing chamber. The second side of the burner head mixing chamber is connected to a burner head mixing nozzle. The first side and the second side are two sides with opposite directions. For example, if the first side is the left side, the second side is the right side.

[0012] The aforementioned dual-use regenerative burner for both coal gas and natural gas can be used for dual preheating of blast furnace gas and air, or for dual preheating of blast furnace gas and air followed by partial use of natural gas, or, through valve switching, can be used for natural gas without preheating, while air is preheated only.

[0013] The aforementioned dual-use regenerative burner for both coal gas and natural gas has its mixing nozzle facing the second side.

[0014] The aforementioned dual-use regenerative burner for both coal gas and natural gas has a mixing nozzle at the burner head facing slightly upwards to the second side.

[0015] The above-described dual-use regenerative burner for both coal gas and natural gas has an angle of 60° to 90° between the mixing nozzle at the burner head and the horizontal plane when the nozzle is oriented slightly upwards towards the second side.

[0016] According to the process design requirements, the distribution section ratio of the mixing nozzle 9 at the burner head is as follows: 80% towards the second side and 20% towards the upper part of the second side.

[0017] The above-mentioned dual-use regenerative burner for both coal gas and natural gas has a blast furnace gas regenerator layered along the axial direction of the blast furnace gas regenerator chamber.

[0018] The aforementioned dual-use regenerative burner for both coal gas and natural gas has an air regenerator layered along the axial direction of the air regenerator chamber.

[0019] The aforementioned dual-use regenerative burner for both coal gas and natural gas has a flat, elliptical, or circular mixing nozzle at the burner head.

[0020] The aforementioned dual-use regenerative burner for both coal gas and natural gas has a single or multiple mixing nozzles at the burner head.

[0021] This application has the following beneficial effects:

[0022] 1. This application integrates the air heat storage chamber, blast furnace gas heat storage chamber and natural gas passage into a single burner, which integrates air supply, gas supply and flue gas exhaust into one unit, thus reducing the size of the burner.

[0023] 2. It can be used for dual preheating of blast furnace gas and air alone, or for dual preheating of blast furnace gas and air and then partial use of natural gas; by switching valves, it can also be used for natural gas alone without preheating, while air is preheated alone, thus having a wider range of applications.

[0024] 3. When using natural gas, the air storage chamber and the blast furnace gas storage chamber supply air simultaneously, meeting the air consumption requirements of natural gas, providing more sufficient oxygen supply, eliminating the need for equipment modification and additional components, making it convenient to use and cost-effective.

[0025] 4. The flame nozzle at the burner head can be structured in different ways to organize the flame and meet the heating process requirements of different furnaces and kilns.

[0026] 5. When the burners are symmetrically installed on the furnace wall, combustion and exhaust can be reversed. When the burners on one side are burning, the burners on the other side are exhausting smoke, resulting in high heat storage efficiency.

[0027] 6. By employing a mixing chamber and a mixing nozzle at the burner head, the blast furnace gas and air are partially premixed in the mixing chamber before being ejected from the mixing nozzle. This allows for more complete contact between the fuel and air during combustion, creating favorable conditions for the combustion reaction. Compared to simple diffusion combustion, this method makes fuller use of air, resulting in more complete combustion and thus improving combustion efficiency. Attached Figure Description

[0028] Figure 1 This is a front view of an embodiment of the present utility model.

[0029] Figure 2 This is a top view of an embodiment of the present utility model.

[0030] Figure 3 This is a left view of an embodiment of the present utility model.

[0031] Figure 4 This is a cross-sectional view of AA, an embodiment of the present utility model.

[0032] Figure 5 This is a schematic diagram of a structure of this utility model after it is used in a furnace or kiln.

[0033] Figure 6 This is another structural schematic diagram of the present invention after it is used in a furnace or kiln.

[0034] Figure 7 This is another structural schematic diagram of the present invention after it is applied to a furnace or kiln.

[0035] Figure 8 This is a schematic diagram of the first structure of the mixed gas nozzle according to an embodiment of the present invention.

[0036] Figure 9 This is a schematic diagram of a second structure of the mixed gas nozzle according to an embodiment of the present invention.

[0037] Figure 10 This is a schematic diagram of the third structure of the mixed gas nozzle according to an embodiment of the present invention.

[0038] Figure 11 This is a schematic diagram of valve operation during combustion on the first side and exhaust on the second side in an embodiment of the present invention for use in a furnace and kiln where blast furnace gas is burned.

[0039] Figure 12 This is a schematic diagram of valve operation during combustion on the first side and exhaust on the second side in an embodiment of the present invention for use in a furnace or kiln burning natural gas.

[0040] Figure 13 This is a schematic diagram of valve operation during combustion on the second side and exhaust on the first side in an embodiment of the present invention for use in a furnace and kiln where blast furnace gas is burned.

[0041] Figure 14 This is a schematic diagram of valve operation during combustion on the second side and exhaust on the first side in an embodiment of the present invention for use in a furnace or kiln burning natural gas.

[0042] In the figure, the corresponding figures are as follows: 1. Air inlet, 2. Burner body, 3. Air regenerator chamber, 4. Air regenerator, 5. Burner head mixing chamber, 6. Blast furnace gas inlet, 7. Blast furnace gas regenerator chamber, 8. Blast furnace gas regenerator, 9. Burner head mixing nozzle, 10. Natural gas inlet, 11. Natural gas passage, 12. Material, 13. First valve, 14. Second valve, 15. Third valve, 16. Fourth valve, 17. Fifth valve, 18. Sixth valve, 19. Seventh valve, 20. Eighth valve. Detailed Implementation

[0043] Example: Figures 1 to 4 A dual-use regenerative burner for coal gas and natural gas has a burner body 2, an air regenerative chamber 3, a blast furnace gas regenerative chamber 7 and a natural gas passage 11 inside the burner body 2. Multiple air regenerative bodies 4 are arranged in layers along the axial direction of the air regenerative chamber 3 inside the air regenerative chamber 3. An air inlet 1 is connected to the end of the first side of the air regenerative chamber 3.

[0044] Multiple blast furnace gas heat storage bodies 8 are arranged in layers along the axial direction of the blast furnace gas heat storage chamber 7. A blast furnace gas inlet 6 is connected to the end of the first side of the blast furnace gas heat storage chamber 7.

[0045] A natural gas inlet 10 is connected to the end of the first side of the natural gas channel 11;

[0046] The second ends of the air heat storage chamber 3, the blast furnace gas heat storage chamber 7, and the natural gas passage 11 are all connected to a burner head mixing chamber 5. The second end of the burner head mixing chamber 5 is provided with a burner head mixing nozzle 9. The air inlet 1, the air heat storage chamber 3, the burner head mixing chamber 5, and the burner head mixing nozzle 9 are connected in sequence. The blast furnace gas inlet 6, the blast furnace gas heat storage chamber 7, the burner head mixing chamber 5, and the burner head mixing nozzle 9 are connected in sequence. The natural gas inlet 10, the natural gas passage 11, the burner head mixing chamber 5, and the burner head mixing nozzle 9 are connected in sequence. The first side and the second side are two sides with opposite directions. For example, if the first side is the left side, the second side is the right side.

[0047] Furthermore, the aforementioned dual-use regenerative burner for both coal gas and natural gas can also be designed, according to process design requirements, such that the distribution cross-sectional ratio of the mixing nozzle 9 at the burner head is: 80% towards the second side and 20% towards the upper part of the second side.

[0048] Because the combustible gas and air are fully and evenly mixed before combustion, the combustible molecules and air can come into full contact, and a rapid chemical reaction can occur during combustion, which greatly increases the combustion speed and releases a large amount of heat in a short time.

[0049] like Figure 8 , Figure 9 and Figure 10 The mixing nozzle 9 at the burner head can be customized into a flat oval shape, a circle, a single nozzle, or multiple nozzles according to actual process requirements, organizing the flame into a shape that meets the process requirements; in some production heating processes that require a large heating area, the nozzle is customized into a flat oval shape; in some production heating processes that require concentrated temperature, the nozzle is customized into a circle, or it can be customized into a single nozzle or multiple nozzles according to the heating process requirements.

[0050] like Figure 5 When the burner of this application is installed on the furnace wall 15, a furnace structure is as follows: the same number of burners are symmetrically arranged on the first and second sides of the furnace wall 15. The burners on the first and second sides are located below the material 12. The mixing nozzle 9 of the burner head extends into the furnace and the direction of the mixing nozzle 9 of the burner head is obliquely upward. The angle between the mixing nozzle 9 of the burner head and the horizontal plane is 60° to 90°.

[0051] like Figure 6When the burner of this application is installed on the furnace wall 15, another furnace structure is as follows: the first side and the second side of the furnace wall 15 are provided with the same number of burners. The burners on the first side are located below the material 12, and the burners on the second side are located above the material 12. The end face of the burner head is flush with the inner surface of the furnace wall 15, and the mixing nozzle 9 of the burner head of the burner on the first side faces the second side, while the mixing nozzle 9 of the burner head of the burner on the second side faces the first side.

[0052] like Figure 7 and refer to Figure 5 When the burner of this application is installed on the furnace wall 15, another furnace structure is as follows: according to the process design requirements, the distribution section ratio of the mixing nozzle 9 of the burner head is as follows: 80% of the mixing nozzle 9 of the burner head of the first burner faces the second side, and 20% faces the upper part of the second side; 80% of the mixing nozzle 9 of the burner head of the second burner faces the first side, and 20% faces the upper part of the first side.

[0053] like Figures 10 to 13 All the blast furnace gas inlets 6 of the burners on the first side are connected to a first pipe. A third valve 15 is provided on the first pipe. All the air inlets 1 of the burners on the first side are connected to a second pipe. A first valve 13 is provided on the second pipe. A third pipe is provided between the first pipe and the second pipe. The third pipe is located on the second side of the first valve 13 and the third valve 15. One end of the third pipe is connected to the first pipe, and the other end of the third pipe is connected to the second pipe. A fourth valve 16 is provided on the third pipe. The natural gas inlets 10 of the burners on the first side are connected to a seventh pipe. A second valve 14 is provided on the seventh pipe.

[0054] All the blast furnace gas inlets 6 of the burners on the second side are connected to a fourth pipe, which is equipped with a fifth valve 17. All the air inlets 1 of the burners on the second side are connected to a fifth pipe, which is equipped with a seventh valve 19. A sixth pipe is located between the fourth and fifth pipes, on the first side of the fifth valve 17 and the seventh valve 19. One end of the sixth pipe is connected to the fourth pipe, and the other end of the sixth pipe is connected to the fifth pipe. A sixth valve 18 is installed on the sixth pipe. The natural gas inlets 10 of the burners on the second side are connected to an eighth pipe, which is equipped with an eighth valve 20.

[0055] like Figure 11 When blast furnace gas is burned, the burners on the first side burn and the burners on the second side exhaust smoke. At this time, the first valve 13, the third valve 15, the fifth valve 17 and the seventh valve 19 are in the open state, and the second valve 14, the fourth valve 16, the sixth valve 18 and the eighth valve 20 are in the closed state.

[0056] Blast furnace gas enters the blast furnace gas inlet 6 of the first burner through the first pipe, flows through the blast furnace gas regenerator 8 in the blast furnace gas regenerator 7 of the first burner, and air enters the air inlet 1 through the second pipe, flows through the air regenerator 4 in the air regenerator 3 of the first burner, and the blast furnace gas and air enter the mixing chamber 5 of the burner head of the first burner at the same time. After being completely mixed, they are ejected from the mixing nozzle 9 of the burner head of the first burner and burned, forming a complete mixture combustion.

[0057] The flue gas enters from the mixing nozzle 9 at the burner head of the second burner, flows through the blast furnace gas regenerator 8 in the blast furnace gas regenerator 7 of the second burner, passes through the blast furnace gas inlet 6 of the second burner and exits through the fourth pipe, and flows through the air regenerator 4 in the air regenerator 3 of the second burner, passes through the air inlet 1 of the second burner and exits through the fifth pipe. After passing through the air regenerator 4 and the blast furnace gas regenerator 8, the flue gas temperature drops to 100-150℃.

[0058] like Figure 13 After a predetermined time, the direction is reversed, the burner on the second side burns, and the burner on the first side exhausts smoke. At this time, the first valve 13, the third valve 15, the fifth valve 17 and the seventh valve 19 are in the open state, and the second valve 14, the fourth valve 16, the sixth valve 18 and the eighth valve 20 are in the closed state.

[0059] Blast furnace gas enters the blast furnace gas inlet 6 through the fourth pipe on the second side, flows through the blast furnace gas regenerator 8 in the blast furnace gas regenerator chamber 7, and air enters the air inlet 1 through the fifth pipe on the second side, flows through the air regenerator 4 in the air regenerator chamber 3 of the burner on the second side, and the blast furnace gas and air enter the mixing chamber 5 at the burner head at the same time. After being completely mixed, they are sprayed out from the mixing nozzle 9 at the burner head and burned, forming a complete mixture combustion.

[0060] The flue gas enters from the mixing nozzle 9 at the burner head of the first burner, flows through the blast furnace gas regenerator 8 in the blast furnace gas regenerator 7 of the first burner, passes through the blast furnace gas inlet 6 of the first burner and exits through the first pipe, and flows through the air regenerator 4 in the air regenerator 3 of the first burner, passes through the air inlet 1 of the first burner and exits through the second pipe. After passing through the air regenerator 4 and the blast furnace gas regenerator 8, the flue gas temperature is reduced to 100-150℃.

[0061] By repeating this process of reversing direction, heat storage combustion is achieved.

[0062] like Figure 12When natural gas is burned, the burner on the first side burns and the burner on the second side exhausts smoke. At this time, the first valve 13, the second valve 14, the fourth valve 16, the fifth valve 17 and the seventh valve 19 are in the open state, and the third valve 15, the sixth valve 18 and the eighth valve 20 are in the closed state.

[0063] Because natural gas combustion requires a large amount of air, the required air enters through a second pipeline and is divided into two paths. One path enters from the air inlet 1 of the first burner, flows through the air regenerator 4 in the air regenerator chamber 3 of the first burner, and then enters the mixing chamber 5 at the burner head of the first burner. The other path flows through the third pipeline and the first pipeline, enters from the blast furnace gas inlet 6 of the first burner, flows through the blast furnace gas regenerator 8 in the blast furnace gas regenerator chamber 7 of the first burner, and then enters the mixing chamber 5 at the burner head of the first burner. Natural gas enters the mixing chamber 5 at the burner head of the first burner through the seventh pipeline. After the natural gas and air are completely mixed in the mixing chamber 5 at the burner head of the first burner, they are ejected from the mixing nozzle 9 at the burner head of the first burner and burned, forming a complete mixture combustion.

[0064] The flue gas enters from the mixing nozzle 9 at the burner head of the second burner, flows through the blast furnace gas regenerator 8 in the blast furnace gas regenerator chamber 7 of the second burner, passes through the blast furnace gas inlet 6 of the second burner and exits through the fourth pipe, and flows through the air regenerator 4 in the air regenerator chamber 3 of the second burner, passes through the air inlet 1 of the second burner and exits through the fifth pipe. The flue gas temperature drops to 100-150℃ after passing through the air regenerator 4 and the blast furnace gas regenerator 8.

[0065] like Figure 14 After a predetermined time, the direction is reversed, the burner on the second side burns, and the burner on the first side exhausts smoke. At this time, the first valve 13, the third valve 15, the sixth valve 18, the seventh valve 19 and the eighth valve 20 are in the open state, and the second valve 14, the fourth valve 16 and the fifth valve 17 are in the closed state.

[0066] The required air enters through the fifth pipe and is divided into two paths. One path enters from the air inlet 1 of the second burner, flows through the air regenerator 4 in the air regenerator chamber 3 of the second burner, and then enters the mixing chamber 5 at the burner head of the second burner. The other path flows through the sixth and fourth pipes, enters from the blast furnace gas inlet 6 of the second burner, flows through the blast furnace gas regenerator 7 in the second burner, and then enters the mixing chamber 5 at the burner head. Natural gas enters the mixing chamber 5 at the burner head of the second burner through the eighth pipe. After the natural gas and air are completely mixed in the mixing chamber 5 at the burner head of the second burner, they are ejected from the mixing nozzle 9 at the burner head of the second burner and burned, forming a complete mixture combustion.

[0067] The flue gas enters from the mixing nozzle 9 at the burner head of the first burner, flows through the blast furnace gas regenerator 8 in the blast furnace gas regenerator chamber 7 of the first burner, passes through the blast furnace gas inlet 6 of the first burner and exits through the first pipe, and flows through the air regenerator 4 in the air regenerator chamber 3 of the first burner, passes through the air inlet 1 of the first burner and exits through the second pipe. The flue gas temperature drops to 100-150℃ after passing through the air regenerator 4 and the blast furnace gas regenerator 8.

[0068] By repeating this process of reversing direction, heat storage combustion is achieved.

[0069] This application has the following beneficial effects:

[0070] 1. This application integrates the air heat storage chamber, the blast furnace gas heat storage chamber and the natural gas passage 11 into a single burner, which integrates air supply, gas supply and flue gas exhaust into one unit, thus reducing the size of the burner.

[0071] 2. It can be used for dual preheating of blast furnace gas and air alone, or for dual preheating of blast furnace gas and air and then partial use of natural gas; by switching valves, it can also be used for natural gas alone without preheating, while air is preheated alone, thus having a wider range of applications.

[0072] 3. When using natural gas, the air storage chamber and the blast furnace gas storage chamber supply air simultaneously, meeting the air consumption requirements of natural gas, providing more sufficient oxygen supply, eliminating the need for equipment modification and additional components, making it convenient to use and cost-effective.

[0073] 4. The flame nozzle at the burner head can be structured in different ways to organize the flame and meet the heating process requirements of different furnaces and kilns.

[0074] 5. After the burners are installed on the furnace wall 15, combustion and exhaust can be reversed. When the burners on one side are burning, the burners on the other side are exhausting smoke, resulting in high heat storage efficiency.

[0075] 6. By employing a mixing chamber and a mixing nozzle at the burner head, the blast furnace gas and air are partially premixed in the mixing chamber before being ejected from the mixing nozzle. This allows for more complete contact between the fuel and air during combustion, creating favorable conditions for the combustion reaction. Compared to simple diffusion combustion, this method makes fuller use of air, resulting in more complete combustion and thus improving combustion efficiency.

[0076] The above embodiments are merely preferred technical solutions of this utility model and should not be considered as limitations on this utility model. The protection scope of this utility model should be the technical solution described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the protection scope of this utility model.

Claims

1. A regenerative burner for both coal gas and natural gas, comprising a burner body (2), characterized in that: The burner body (2) is provided with an air heat storage chamber (3), a blast furnace gas heat storage chamber (7) and a natural gas passage (11). The air heat storage chamber (3) is provided with multiple air heat storage bodies (4). An air inlet (1) is connected to the end of the first side of the air heat storage chamber (3). The blast furnace gas heat storage chamber (7) is equipped with multiple blast furnace gas heat storage bodies (8), and the end of the first side of the blast furnace gas heat storage chamber (7) is connected to a blast furnace gas inlet (6); A natural gas inlet (10) is connected to the end of the first side of the natural gas passage (11); The second side ends of the air heat storage chamber (3), the blast furnace gas heat storage chamber (7) and the natural gas passage (11) are connected to a burner head mixing chamber (5). The second side end of the burner head mixing chamber (5) is connected to one or more burner head mixing nozzles (9). The first side and the second side are two sides with opposite directions.

2. The dual-use regenerative burner for both coal gas and natural gas according to claim 1, characterized in that: The blast furnace gas heat storage body (8) is arranged in layers along the axial direction of the blast furnace gas heat storage chamber (7).

3. The dual-use regenerative burner for both coal gas and natural gas according to claim 2, characterized in that: The air heat storage body (4) is arranged in layers along the axial direction of the air heat storage cavity (3).

4. A dual-use regenerative burner for both coal gas and natural gas according to claim 3, characterized in that: The mixing nozzle (9) at the burner head is flat, oval, or round.

5. A dual-use regenerative burner for both coal gas and natural gas according to claim 4, characterized in that: The mixing nozzle (9) at the burner head can be a single nozzle or multiple nozzles.

6. A dual-use regenerative burner for both coal gas and natural gas according to claim 5, characterized in that: The mixing nozzle (9) of the burner head faces the second side.

7. A dual-use regenerative burner for both coal gas and natural gas according to claim 5, characterized in that: The mixing nozzle (9) of the burner head faces the second side slightly upward.

8. A dual-use regenerative burner for both coal gas and natural gas according to claim 7, characterized in that: When the mixing nozzle (9) of the burner head is oriented slightly upward on the second side, the angle between the mixing nozzle (9) of the burner head and the horizontal plane is 60° to 90°.

9. A dual-use regenerative burner for both coal gas and natural gas according to claim 5, characterized in that: The orientation of the mixing nozzle (9) at the burner head can be such that part of it faces the second side and the other part faces the upper part of the second side, according to the proportion of the distribution section.

Images