Novel ceramic burner for hot blast stove

Abstract

The utility model relates to the technical field of burner equipment, and discloses a novel ceramic burner for a hot blast stove, which sequentially comprises a ceramic combustion chamber, an accelerating chamber, a flow equalizing chamber, a flow mixing chamber and a flow guide chamber from top to bottom, an air connecting pipe and a gas connecting pipe are respectively arranged on two sides of the flow guide chamber, a necking opening is arranged at the top of the ceramic combustion chamber, and a venturi injection pipe is arranged in the accelerating chamber. A grating plate is arranged in the flow equalizing chamber, and rotating blades are arranged in the flow guide chamber. The gas-air mixing and accelerating device realizes multiple functions of gas flow mixing, flow equalizing, acceleration and the like, is vertically arranged, occupies a small space, is convenient to mount and maintain, saves the earlier-stage investment, greatly prolongs the service life of equipment, has better gas-air mixing effect, more uniform and stable gas flow and more stable flame combustion, improves the running reliability of the equipment, and is suitable for large-scale popularization and application. And good economic and social effects are generated.

Description

Technical Field

[0001] The utility model relates to the technical field of burner equipment, in particular to a novel ceramic burner for a hot blast furnace. Background Art

[0002] In recent years, as people have paid close attention to increasingly severe environmental and climate issues, it is imperative to build low-carbon, clean and efficient enterprises. The hot blast furnace in an ironmaking plant is the main process equipment. After the cold air is heated by the burner, the hot air is sent into the blast furnace for smelting.

[0003] The commonly used heaters currently have the defects of poor gas-air mixing, inconvenient disassembly and maintenance, and short service life. In addition, the burner on the top is straight or open, which does not fully burn the mixed gas.

[0004] In the document CN202210252543, a multi-swirl column flow low nitrogen top-fired hot blast furnace burner is disclosed, the upper part of the side wall of the burner wall is provided with an air inlet pipe, a gas inlet pipe, and an air inlet pipe, the gas ring is arranged in the middle part of the burner wall, the air ring is arranged on the upper and lower sides of the gas ring, respectively, forming a three-ring structure, the upper and lower parts of the air ring are respectively provided with air channels, the gas ring is alternately provided with four gas channels from top to bottom, the air channel and the gas channel are connected to the first row of nozzles and the second row of nozzles through a mixing channel, the air riser and the gas channel are connected to the third row of nozzles and the fourth row of nozzles through a mixing channel, and the four rows of nozzles constitute a nozzle short flame flameless staggered four rows of multi-swirl multi-angle wide flow field jet structure. The upper part is made into a straight cylinder, which cannot effectively gather the flame and cannot be fully burned.

[0005] Therefore, a new technical solution is needed to solve the above technical problems. Summary of the invention

[0006] In order to solve the above problems, the utility model discloses a new ceramic burner for a hot blast furnace, which realizes multiple functions such as air flow mixing, equalizing, and acceleration. It is arranged up and down, occupies a small space, is easy to install and maintain, and saves initial investment. The combustion chamber is made of heat-resistant ceramic material, which greatly extends the service life of the equipment. The gas and air mixing effect is better, the airflow is more evenly distributed and stable, the flame combustion is more stable, the reliability of equipment operation is improved, and better economic and social effects are produced.

[0007] The technical solution of the utility model is: a new ceramic burner for a hot blast furnace, which comprises a ceramic combustion chamber, an acceleration chamber, a flow equalization chamber, a flow mixing chamber and a flow guide chamber from top to bottom, with air connection pipes and gas connection pipes on both sides of the flow guide chamber respectively, a constriction is arranged on the top of the ceramic combustion chamber, a Venturi ejector is arranged in the acceleration chamber, a grille plate is arranged in the flow equalization chamber, and rotating blades are arranged in the flow guide chamber.

[0008] By adopting the above technical solution, multiple functions such as airflow mixing, equalization, and acceleration are realized, and integration is achieved. The ceramic combustion chamber, Venturi ejector, grille plate, and rotating blade wearing parts are easy to disassemble and replace without having to be replaced as a whole, saving a lot of maintenance costs.

[0009] Preferably, the ceramic combustion chamber is tapered outwards, that is, the diameter of the top of the ceramic combustion chamber is smaller than the diameter of the bottom, and an igniter is provided on the side of the ceramic combustion chamber.

[0010] By adopting the above technical solution and refractory ceramic materials, the service life is extended; the top adopts a necking design to effectively gather the flame, and the bottom is flange-connected, so it can be easily disassembled and replaced if damaged.

[0011] Preferably, the venturi ejectors are arranged radially in the acceleration chamber in sequence, the upper part of the venturi ejectors is higher than the lower part, the angle between the two sides of the upper part is 11-13°, and the angle between the two sides of the lower part is 27-29°, and the bottom of the venturi ejectors is connected to the flow equalizing chamber through a orifice plate, and the orifice plate is evenly distributed with through holes.

[0012] By adopting the above technical solution, the mixed gas flow is accelerated inside the venturi ejector tube, thus ensuring continuous flow even under very small gas pressure conditions, so that the flame maintains a stable combustion state. The through hole not only plays a role in flow equalization, but also serves as a support for the venturi ejector tube.

[0013] Preferably, the grid plate is in a uniform cross grid shape, and is used to connect the acceleration chamber and the mixing chamber.

[0014] By adopting the above technical solution, when the mixed airflow enters from the bottom and flows upward, the airflow obtains a great uniform fluidization effect.

[0015] Preferably, the mixing chamber and the guide chamber are located in the same shell, the mixing chamber is located above the rotating blades, the rotating blades are located on the rotating shaft, and the bearings at both ends of the rotating shaft are respectively connected to the bottom plate at the bottom of the guide chamber and the side wall of the shell.

[0016] Preferably, the air pipe and the gas pipe are arranged in an eccentric tangent, and the outer sides of the air pipe and the gas pipe are located in the tangent direction of the mixing chamber shell. The air pipe and the gas pipe are not on the same straight line, but are parallel to each other. The air pipe and the gas pipe are located in the middle of the mixing chamber.

[0017] By adopting the above technical solution, the inflowing gas and air impact the rotating blades, driving the rotating blades to rotate, and the airflow rises in a spiral under the drive of the blades and enters the upper mixing chamber for mixing.

[0018] Preferably, combustion-supporting air is introduced into the air pipe, and combustion-supporting gas is introduced into the gas pipe, and the inlets of the air pipe and the gas pipe are arranged oppositely.

[0019] By adopting the above technical solution, sufficient mixed flow is carried out in the mixing chamber to obtain a better mixing effect.

[0020] Preferably, the ceramic combustion chamber, the acceleration chamber, the flow equalization chamber, the flow mixing chamber, and the bottom plate are all connected by flange bolts.

[0021] By adopting the above technical solution, when maintenance is needed, it is convenient to disassemble and replace wearing parts without replacing the entire part, thus saving a lot of maintenance costs.

[0022] The advantages of the utility model are as follows: 1. In the utility model, the gas and air enter in opposite directions, so when entering the guide chamber, they can collide with the rotating blades. The gas and air are driven by the rotating blades to rise in a spiral and enter the upper mixing chamber for mixing.

[0023] 2. The top of the ceramic combustion chamber of the utility model adopts a constricted design, which can effectively gather the flame and fully burn the mixed gas when the mixed gas is ignited and burned.

[0024] 3. In the venturi ejector of the utility model, the mixed gas flow is accelerated inside the ejector, thus ensuring continuous flow even under very low gas pressure conditions, so that the flame maintains a stable combustion state.

[0025] 4. The utility model hot blast furnace uses a new type of ceramic burner to achieve multiple functions such as airflow mixing, equalizing, and acceleration. It is set up up and down, occupies a small space, is easy to install and maintain, and saves initial investment. The combustion chamber is made of heat-resistant ceramic material, which greatly extends the service life of the equipment. The gas and air mixing effect is better, the airflow is more evenly distributed and stable, and the flame combustion is more stable, which improves the reliability of equipment operation and produces better economic and social effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of the utility model;

[0027] Figure 2 It is a schematic diagram of the top view structure of the acceleration chamber of the utility model;

[0028] Figure 3 It is a structural schematic diagram of the Venturi ejector tube of the utility model;

[0029] Figure 4 It is a structural schematic diagram of the orifice plate of the utility model;

[0030] Figure 5 This is a schematic diagram of the structure of the grid plate of the utility model;

[0031] Figure 6It is a structural schematic diagram of a top view of an air connection pipe of the utility model.

[0032] Among them: 1. Ceramic combustion chamber, 1-1, constriction, 2. Acceleration chamber, 3. Flow equalization chamber, 4. Mixing chamber, 5. Rotating blades, 6. Air pipe, 7. Bottom plate, 8. Bearing, 9. Rotating shaft, 10. Gas pipe, 11. Grid plate, 12. Orifice plate, 12-1, through hole, 13. Venturi ejector, 14. Ignitor, 15. Diversion chamber, DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0034] like Figure 1 As shown, the new ceramic burner for the hot blast furnace includes, from top to bottom, a ceramic combustion chamber 1, an acceleration chamber 2, a flow equalizing chamber 3, a flow mixing chamber 4 and a guide chamber 14, with air connection pipes 6 and gas connection pipes 10 on both sides of the guide chamber 14 respectively, the top of the ceramic combustion chamber 1 is set as a constriction 1-1, a venturi ejector 12 is arranged in the acceleration chamber 2, a grid plate 11 is arranged in the flow equalizing chamber 3, and a rotating blade 5 is arranged in the guide chamber 15, so as to realize multiple functions such as airflow mixing, flow equalization and acceleration, and realize integration, and the ceramic combustion chamber 1, the venturi ejector 13, the grid plate 11 and the rotating blade 5 wearing parts are convenient to disassemble and replace, and do not need to be replaced as a whole, thus saving a lot of maintenance costs.

[0035] The ceramic combustion chamber 1 is tapered outwards 1-1, that is, the diameter of the top of the ceramic combustion chamber 1 is smaller than the diameter of the lower part. An igniter 14 is provided on the side of the ceramic combustion chamber 1. It is made of refractory ceramic material to extend its service life. The top is designed with a tapered mouth to effectively gather the flame, and the bottom is connected by a flange, which can be easily disassembled and replaced if damaged.

[0036] like Figure 2-4 As shown, the venturi ejector tubes 13 are sequentially arranged in the acceleration chamber 2 in a radial shape, the upper part of the venturi ejector tube 13 is higher than the lower part, the angle between the two sides of the upper part is 11-13°, and the angle between the two sides of the lower part is 27-29°. The bottom of the venturi ejector tube 13 is connected to the flow equalization chamber 3 through the orifice plate 12, and the orifice plate 12 is evenly provided with through holes 12-1. The mixed gas flow is accelerated in the venturi ejector tube 13, so that it can ensure continuous flow even under very small gas pressure conditions, so that the flame maintains a stable combustion state. The through hole 12-1 not only plays a role in flow equalization, but also serves as a support for the venturi ejector tube 13.

[0037] like Figure 5 As shown, the grid plate 11 is in a uniform cross grid shape, which is used to connect the acceleration chamber 2 and the mixing chamber 4. When the mixed airflow enters from the bottom and flows upward, the airflow obtains a great uniform fluidization effect.

[0038] like Figure 6 As shown, the mixing chamber 4 and the guide chamber 15 are located in the same shell, the mixing chamber 4 is located above the rotating blade 5, the rotating blade 5 is located on the rotating shaft 9, the bearings 8 at both ends of the rotating shaft 9 are respectively connected to the bottom plate 7 at the bottom of the guide chamber 15 and the side wall of the shell, the air pipe 6 and the gas pipe 10 are arranged in an eccentric tangent, the outer sides of the air pipe 6 and the gas pipe 10 are located in the tangent direction of the shell of the mixing chamber 4, the air pipe 6 and the gas pipe 10 are not on the same straight line, but parallel to each other, the air pipe 6 and the gas pipe 10 are located in the middle of the mixing chamber 4, the inflowing gas and air impact the rotating blade, driving the rotating blade 5 to rotate, the airflow rises in a spiral under the drive of the blade, and enters the upper mixing chamber 4 for mixing.

[0039] Combustion-supporting air is introduced into the air pipe 6, and combustion-supporting coal gas is introduced into the gas pipe 10. The inlets of the air pipe 6 and the gas pipe 10 are arranged oppositely, so that when air and coal gas enter, they just impact the rotating blades 5, causing the rotating blades 5 to rotate, guiding the mixed airflow upward, and performing sufficient mixing flow in the mixing chamber 4 to obtain a better mixing effect.

[0040] The ceramic combustion chamber 1, the acceleration chamber 2, the flow equalizing chamber 3, the mixing chamber 4, and the bottom plate 7 are all connected by flange bolts and are all in a straight cylindrical shape. When maintenance is required, it is convenient to disassemble and replace the wearing parts without replacing the entire part, thus saving a lot of maintenance costs.

[0041] Working principle: clean air flows in from the air pipe 6, and clean gas flows in from the gas pipe 10. The inflowing gas and air impact the rotating blades 5, driving the blades to rotate. Driven by the blades, the airflow rises in a spiral and enters the upper mixing chamber 4 for mixing.

[0042] The fully mixed gas and air in the mixing chamber 4 enter from the bottom of the grid plate 11 and flow upward. The airflow is evenly distributed in the grid plate 11. The long flow channel also makes the airflow smooth and stable at the outlet.

[0043] The mixed airflow flows out from the top of the grid plate 11 and enters the orifice plate 12, which also has the function of equalizing the flow. Then the airflow flows into the Venturi ejector 13, and the flow is guided and accelerated inside the Venturi ejector 13, so that the continuous flow can be ensured even under very low gas pressure conditions, so that the flame can maintain a stable combustion state;

[0044] The mixed gas after uniform flow and acceleration is sprayed into the ceramic combustion chamber 1 from the outlet of the venturi ejector 13, and is ignited and burned by the igniter 14. The heat generated is used to heat the cold air entering the hot blast furnace.

[0045] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention, and the purpose of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments, and the implementation methods of the present invention may be deformed or modified in any way without departing from the principles.

Claims

1. A new type of ceramic burner for a hot blast furnace, which includes a ceramic combustion chamber, an acceleration chamber, a flow equalization chamber, a flow mixing chamber and a flow guide chamber from top to bottom, and the two sides of the flow guide chamber are air pipes and gas pipes respectively, and the characteristics are: The top of the ceramic combustion chamber is configured as a constriction, a Venturi ejector is provided in the acceleration chamber, a grid plate is provided in the flow equalization chamber, and a rotating blade is provided in the flow guide chamber.

2. The novel ceramic burner for hot blast stove according to claim 1 is characterized in that: The ceramic combustion chamber is narrowed outwards, that is, the diameter of the top of the ceramic combustion chamber is smaller than the diameter of the bottom, and an igniter is arranged on the side of the ceramic combustion chamber.

3. The novel ceramic burner for hot blast stove according to claim 1 is characterized in that: The venturi ejectors are arranged radially in the acceleration chamber in sequence, the upper part of the venturi ejectors is higher than the lower part, the angle between the two sides of the upper part is 11-13°, and the angle between the two sides of the lower part is 27-29°. The bottom of the venturi ejectors is connected to the flow equalization chamber through a orifice plate, and the orifice plate is evenly distributed with through holes.

4. The novel ceramic burner for hot blast stove according to claim 1 is characterized in that: The grid plate is in a uniform cross grid shape and is used to connect the acceleration chamber and the mixing chamber.

5. The novel ceramic burner for hot blast stove according to claim 1 is characterized in that: The mixing chamber and the guide chamber are located in the same shell. The mixing chamber is located above the rotating blades. The rotating blades are located on the rotating shaft. The bearings at both ends of the rotating shaft are respectively connected to the bottom plate at the bottom of the guide chamber and the side wall of the shell.

6. The novel ceramic burner for hot blast stove according to claim 1 is characterized in that: The air pipe and the gas pipe are arranged in an eccentric tangent, and the outer sides of the air pipe and the gas pipe are located in the tangent direction of the mixing chamber shell. The air pipe and the gas pipe are not on the same straight line, but are parallel to each other. The air pipe and the gas pipe are located in the middle of the mixing chamber.

7. The novel ceramic burner for hot blast stove according to claim 1 is characterized in that: Combustion-supporting air is introduced into the air pipe, and combustion-supporting gas is introduced into the gas pipe. The inlets of the air pipe and the gas pipe are arranged opposite to each other.

8. The novel ceramic burner for hot blast stove according to claim 1 is characterized in that: The ceramic combustion chamber, the acceleration chamber, the flow equalization chamber, the flow mixing chamber and the bottom plate are all connected by flange bolts.

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