Coal-fired premixing burner for thermal power plant

Abstract

The utility model provides a coal-fired premixed burner for a thermal power plant, which relates to the technical field of premixed burners and comprises a burner body, a left fuel gas feeding structure, a right fuel gas feeding structure and a base. The front side is provided with an injection channel; the lower side is provided with an ignition spray gun and a base; the rear part is provided with a coal inlet and a discharging screen plate; the upper part is provided with a draught flue; the device body comprises a combustion cavity, a gap and a fastening screw are arranged between the outer shell and the inner shell, the device body is made of cast steel materials, and a rock wool heat preservation layer and a corundum brick fire insulation layer are arranged in the device body. The feeding structure comprises a U-shaped pipeline, a pipeline, an exhaust fan and the like and is in bilateral symmetry. The combustor body is firm in structure, heat preservation and heat insulation are achieved, the U-shaped pipeline prevents fuel backflow, bidirectional feeding promotes mixing, all parts work cooperatively, the combustion efficiency can be effectively improved, potential safety hazards are reduced, the combustor is suitable for fire coal combustion of a thermal power plant, and safe and efficient operation is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of premix burner, concretely relates to a coal premix burner for thermal power plant. BACKGROUND

[0002] Premix combustion refers to that fuel is mixed with air to form combustible mixture before combustion reaction, and combustion flame temperature is lower than adiabatic flame temperature under the action of flame stabilizing device; natural gas combustion is widely applied to various industrial, civil boilers and other burners as energy source.

[0003] In the specification of prior art (announcement number CN211399776U) a premix burner, it is mentioned that "the upper surface of the rear seat is fixedly installed with a first fuel air inlet, one side of the rear seat is fixedly installed with a second fuel air inlet, the other side of the rear seat is fixedly installed with a coal inlet, one side of the coal inlet is fixedly installed with a discharge screen, the upper surface of the rear seat is fixedly installed with a ventilation window, one side of the rear seat is fixedly installed with a first double-layer seamless steel pipe, one end of the first double-layer seamless steel pipe is fixedly installed with a partition, the inside of the partition is provided with a sealing gasket, one side of the partition is fixedly installed with a second double-layer seamless steel pipe, one end of the second double-layer seamless steel pipe is fixedly installed with a nozzle", but the body of the premix burner in the prior art is easy to lose heat, is not solid and firm, and conveying fuel is easy to cause backflow, has certain safety hidden danger, and is not safe and durable. CONTENT OF UTILITY MODEL

[0004] In order to overcome the defects in the prior art, a coal premix burner for thermal power plant is provided to solve the problems that the body of the premix burner in the prior art is easy to lose heat, is not solid and firm, conveying fuel is easy to cause backflow, has certain safety hidden danger, and is not safe and durable.

[0005] In order to achieve the above-mentioned purpose, a coal premix burner for thermal power plant is provided, which comprises:

[0006] The body (1) is fixedly provided with a left hanger (16) and a right hanger (17) on the upper part of the left and right sides by welding, the spray channel (19) in the middle of the front side is communicated with the internal combustion chamber (18) of the body (1), the ignition lance (12) at the lower part of the left and right sides is installed on the body (1) by screw connection, the lower side of the body (1) is fixed on the base (4) by bolt connection, the coal inlet (10) at the rear part is communicated with the inside of the body (1), the discharge screen (11) at the inner lower part is installed in the body (1) by clamping groove inlay, and the edge of the discharge screen (11) is tightly combined with the inner wall of the body (1);

[0007] The upper left and right exhaust flues (15) are communicated with the top of the combustion chamber (18), and the left inlet (13) in the center of the left side and the right inlet (14) in the center of the right side are both communicated with the combustion chamber (18);

[0008] The combustion chamber (18) in the device body (1) is a hollow structure, and a gap is provided between the outer shell (100) and the inner shell (101). The outer shell (100) and the inner shell (101) are fixedly connected by a plurality of fastening screws (104), and the outer shell (100) and the inner shell (101) are made of high-temperature-resistant cast steel. The connection between the outer shell (100) and the inner shell (101) is firm and reliable.

[0009] The inner side of the inner shell (101) is provided with a heat preservation layer (102) by bonding, and the inner side of the heat preservation layer (102) is provided with a fireproof layer (103) by inlaying. The fireproof layer (103) is made of corundum brick, and the fireproof layer (103), the heat preservation layer (102) and the inner shell (101) are tightly combined to form a good heat insulation and fireproof structure.

[0010] The left gas feeding structure (2) is connected to the left inlet (13) by a flange connection at one end, and is hung by the left hanger (16). The left gas feeding structure (2) and the right gas feeding structure (3) are symmetrical about the center line of the device body (1) and have the same structure. The components of the left gas feeding structure (2) are tightly connected.

[0011] The right gas feeding structure (3) is connected to the right inlet (14) by a flange connection at one end and is hung by the right hanger (17). The upper side of the U-shaped pipeline (31) of the right gas feeding structure (3) is connected to the first pipeline (30) by welding, and the other side is connected to the second pipeline (32) by welding. The second pipeline (32) is provided with an external interface (34) at the other end by a flange connection.

[0012] The base (4) is provided with an inner support plate (42) in the middle of the upper end face by welding, and the control panel (40) is fixed in the middle of the inner support plate (42) by a bolt connection. The base (4) is provided with an outer support plate (41) on the left and right sides of the upper end face by welding. The structure design of the base (4) can provide a stable support foundation for the device body (1).

[0013] The inner and outer shells of the device body (1) are tightly connected by fastening screws (104) to form a double-layer structure. The connection between the inner and outer shells not only relies on the fastening force of the fastening screws (104), but also cooperatively bears the pressure through the reasonable cooperation between the outer shell (100) and the inner shell (101).

[0014] The left inlet (13) and the right inlet (14) are symmetrically arranged at the center of the two side surfaces of the body (1), so that the fuel is transported from the two sides to the center of the combustion chamber (18), forming a counter-charge type feeding, which effectively promotes the rapid and uniform mixing of the fuel in the combustion chamber (18); the connection between the left inlet (13) and the right inlet (14) and the combustion chamber (18) adopts a smooth transition design, which reduces the fuel transportation resistance, and the connection is well sealed to prevent gas leakage.

[0015] The thermal insulation layer (102) is made of rock wool material, and the adhesive between the thermal insulation layer (102) and the inner shell (101) has high temperature resistance and good bonding performance.

[0016] The fireproof layer (103) is made of corundum brick material, which can effectively block the spread of flame to the internal structure of the body (1) and prevent the outer shell (100) and the inner shell (101) from being damaged by heat; the inlaid structure between the fireproof layer (103), the thermal insulation layer (102) and the inner shell (101) is tight, preventing the flame from passing through the gap.

[0017] The welding part of the U-shaped pipeline (31) and the first pipeline (30) and the second pipeline (32) is reinforced to ensure the strength and sealing performance of the connection part.

[0018] The exhaust fan (33) is installed on the second pipeline (32), which can enhance the fuel transportation capacity of the right gas feeding structure (3), and can quickly adjust the fuel supply when the burner starts and stops, adapting to different working conditions; the connection between the exhaust fan (33) and the second pipeline (32) is sealed by a sealing gasket, ensuring that the exhaust fan (33) will not leak during operation.

[0019] The control panel (40) is fixed in the middle part of the inner support plate (42) of the base (4); the control panel (40) is connected with each electrical component of the burner through wires, and the wires are arranged reasonably.

[0020] The outer support plate (41) is arranged on the left and right parts of the upper end surface of the base (4), which is used to support the two sides of the body (1) and works together with the inner support plate (42) to provide a stable support structure for the body (1), and the contact parts of the outer support plate (41) and the base (4) and the body (1) are buffered by a buffering material.

[0021] The discharging mesh plate (11) is located at the coal inlet (10) at the lower part of the body (1), and the mesh size is moderate, which can ensure the smooth entry of coal into the combustion chamber (18) and prevent large coal or impurities from entering, avoiding the blockage of the internal passage of the burner, and at the same time, the coal is preliminarily dispersed before entering the combustion chamber (18), which is beneficial to the combustion reaction; the discharging mesh plate (11) is tightly matched with the clamping groove of the inner wall of the body (1). Advantages

[0022] 1. The inner and outer shell of the body is solid and firm, not easy to damage, more safe and durable; and the left and right sides of the body are respectively provided with left inlet and right inlet, which facilitates bidirectional corresponding fuel conveying, the conveying direction is concentrated to the center of the combustion chamber, promotes rapid mixing of fuel, and burning is more convenient and stable.

[0023] 2. The fireproof layer provided in the inner side of the body plays a safe effect of blocking flame, and the setting of the heat preservation layer plays a heat preservation effect, on one hand reduces the loss of burning heat, on the other hand prevents fire and is safe and reliable, and use is safer and more reliable.

[0024] 3. The U-shaped pipeline provided on the right gas feeding structure plays the effect of preventing fuel backflow, so that the fuel conveying to the center of the body is safer and more stable, the left gas feeding structure and the right gas feeding structure are provided with the same structure, and another kind of fuel backflow is also placed, and fuel conveying is safer. BRIEF DESCRIPTION OF DRAWINGS

[0025] Fig. 1 is a front view schematic view of the embodiment of the utility model;

[0026] Fig. 2 is a rear view schematic view of the embodiment of the utility model;

[0027] Fig. 3 is a sectional view schematic view of the embodiment of the utility model;

[0028] Fig. 4 is a right gas feeding structure schematic view of the embodiment of the utility model.

[0029] In the drawing: 1, body; 10, coal inlet; 11, discharging screen; 12, ignition lance; 13, left inlet; 14, right inlet; 15, exhaust flue; 16, left hanger; 17, right hanger; 18, combustion chamber; 19, injection channel; 100, outer shell; 101, inner shell; 102, heat preservation layer; 103, fireproof layer; 104, fastening screw; 2, left gas feeding structure; 3, right gas feeding structure; 30, first pipeline; 31, U-shaped pipeline; 32, second pipeline; 33, exhaust fan; 34, external interface; 4, base; 40, control panel; 41, outer support plate; 42, inner support plate. DETAILED DESCRIPTION

[0030] The specific implementation of the utility model will be described in detail below with reference to the drawings.

[0031] Referring to Figs. 1 to 4 The utility model provides a kind of coal-fired pre-mixed burner for thermal power plant mainly by body 1, left gas feeding structure 2, right gas feeding structure 3 and base 4 etc. component composition.

[0032] The left and right hangers 16 and 17 are fixed on the left and right sides of the body 1 respectively by welding. During the welding process, the welds should be uniform and full, without defects such as pores and cracks, to ensure that the left and right hangers 16 and 17 can withstand the weight of the left and right gas inlet structures 2 and 3 and the vibrations and impacts that may occur during operation.

[0033] The injection channel 19 in the middle of the front side is connected to the combustion chamber 18 inside the body 1, and the connection is precisely machined to ensure that the inner wall of the channel is smooth, reducing the resistance of the fuel and air mixture during injection and ensuring smooth injection.

[0034] The ignition lances 12 on the left and right lower sides are installed on the body 1 by threaded connection. When installing the ignition lances 12, threaded holes matching the threads of the ignition lances 12 are machined on the body 1, then the ignition lances 12 are screwed into the threaded holes, and sealing tape or sealant is used to seal the threaded connection to prevent gas leakage.

[0035] The body 1 is fixed on the base 4 by bolt connection. Screw holes are pre-machined on the base 4 and the body 1, the bolts are passed through the screw holes and tightened with nuts, ensuring that the body 1 is accurately and stably installed on the base 4 and will not shift during operation.

[0036] The coal inlet 10 at the back is connected to the inside of the body 1 and is used to transport coal into the combustion chamber 18.

[0037] The discharge mesh 11 at the inner lower part is installed in the body 1 by card slot inlay. The size of the card slot is accurately matched with the size of the edge of the discharge mesh 11, the discharge mesh 11 can be easily inserted into the card slot and firmly fixed, and the edge is tightly fitted with the inner wall of the body 1 to prevent coal leakage from the gap or large coal blocking the internal passage of the burner.

[0038] The exhaust flues 15 on the upper left and right sides are connected to the top of the combustion chamber 18 and are used to discharge the waste gas generated by combustion. The connection part of the exhaust flues 15 and the combustion chamber 18 is designed to be gradually expanded to reduce the exhaust resistance and enable the waste gas to be discharged smoothly.

[0039] The left inlet 13 at the center of the left side and the right inlet 14 at the center of the right side are both connected to the combustion chamber 18, providing a channel for gas to enter the combustion chamber 18. The connection between the left and right inlets 13 and 14 and the combustion chamber 18 is designed with a smooth transition to reduce gas delivery resistance, and the connection is well sealed to prevent gas leakage.

[0040] The left gas feeding structure 2 is connected to the left inlet 13 through a flange connection at one end and is hung by the left hanger 16. When the flange connection is performed, the flange plates are welded at the outlet end of the left gas feeding structure 2 and the left inlet 13 respectively, then the sealing gasket is placed between the flange plates, and the flange plates are fastened by bolts to ensure that the connection is tight and there is no gas leakage. The left gas feeding structure 2 and the right gas feeding structure 3 are symmetrical about the center line of the body 1 and have the same structure, and the symmetrical design enables the fuel to enter the combustion chamber 18 uniformly from both sides, promoting the rapid mixing of the fuel.

[0041] The right gas feeding structure 3 is connected to the right inlet 14 through a flange connection at one end and is hung by the right hanger 17. The upper side of the U-shaped pipe 31 of the right gas feeding structure 3 is connected to the first pipe 30 through welding, and the welding quality needs to be ensured to ensure the connection strength and sealing performance. The other side of the upper part is connected to the second pipe 32 through welding, and the welding quality also needs to be ensured. The suction fan 33 is installed on the second pipe 32 through a bolt connection, and when the suction fan 33 is installed, the mounting seat of the suction fan 33 is aligned with the second pipe 32, and then the two are fastened by bolts. The connection between the suction fan 33 and the second pipe 32 is sealed by a sealing gasket to ensure that there is no gas leakage when the suction fan 33 is working, which affects the fuel delivery effect. The other end of the second pipe 32 is provided with an external interface 34 through a flange connection for connecting an external gas supply source.

[0042] The inner support plate 42 is fixed on the upper end surface of the base 4 through welding, and the welding needs to ensure that the inner support plate 42 is perpendicular to the base 4 to provide a stable installation basis for the control panel 40.

[0043] The control panel 40 is fixed on the inner support plate 42 through a bolt connection. The control panel 40 is connected to each electrical component of the burner through wires, and the wires are arranged reasonably to avoid interfering with the operation of other components, and the wires have good insulation performance to ensure the safety and reliability of the electrical system. Various control buttons and display screens are provided on the control panel 40 for the operator to centrally control the ignition, fuel supply, and combustion parameter adjustment of the burner, improve the convenience and accuracy of operation, and respond to various changes in the combustion process in a timely manner.

[0044] The outer support plates 41 are arranged on the left and right parts of the upper end surface through welding, and the contact parts between the outer support plates 41 and the base 4 and the body 1 are buffered by a buffer material to reduce vibration transmission and prolong the service life of the burner. The outer support plates 41 are used to support the two sides of the body 1 and work together with the inner support plate 42 to provide a stable support structure for the body 1, ensuring that the burner will not be displaced or tilted during operation due to vibration and other factors, and ensuring the stability of the combustion process.

[0045] The combustion cavity 18 is the main space for fuel combustion, and its internal space size and shape are optimized to enable sufficient mixing and combustion of fuel and air. The inner wall of the combustion cavity 18 is made of high-temperature-resistant material and can withstand the scouring of high-temperature flames without deforming or being damaged.

[0046] The outer shell 100 and the inner shell 101 are separated by a certain gap to form an air insulation layer, effectively reducing the heat loss from the combustion cavity 18. The outer shell 100 and the inner shell 101 are made of high-temperature-resistant cast steel material and are tightly connected by multiple sets of fastening screws 104, forming a solid overall structure that can withstand high temperature and pressure during combustion. In a high-temperature environment, cast steel material has good strength and stability, is not easy to deform, and ensures the structural integrity of the device body 1.

[0047] The insulation layer 102 on the inner side of the inner shell 101 is made of rock wool material, which has a low thermal conductivity that can effectively prevent heat transfer from the combustion cavity to the outside, reducing heat loss, improving the thermal efficiency of the burner, and reducing energy consumption. At the same time, the insulation layer 102 can also keep the outer surface temperature of the device body 1 within a safe range to avoid scalding the operator. The adhesive between the insulation layer 102 and the inner shell 101 has good high-temperature resistance and adhesion, ensuring that the insulation layer 102 does not fall off during long-term use and maintains its insulation effect.

[0048] The fireproof layer 103 is made of corundum brick material, which is resistant to high temperature and has good chemical stability, and can effectively block the spread of flames to the internal structure of the device body 1. The fireproof layer 103 is tightly combined with the insulation layer 102 and the inner shell 101 to form a solid fireproof barrier, preventing the outer shell 100 and the inner shell 101 from being damaged by heat, improving the fireproof performance of the burner, and ensuring the long-term safe and stable operation of the burner. The inlaid structure between the fireproof layer 103, the insulation layer 102, and the inner shell 101 is tight, preventing flames from passing through the gaps and further enhancing the fireproofing ability.

[0049] Working principle of gas feeding structure

[0050] The symmetrical arrangement of the left gas feeding structure 2 and the right gas feeding structure 3 enables the fuel to be transported from both sides to the center of the combustion chamber 18, forming a counter-feeding mode. This feeding mode can effectively promote the rapid and uniform mixing of the fuel in the combustion chamber 18, improve the combustion efficiency, and reduce the generation of incomplete combustion products. The fuel enters the U-shaped pipe 31 through the first pipe 30. The special shape of the U-shaped pipe 31 utilizes its own structural characteristics to form a physical barrier during fuel transportation, effectively preventing backflow of the fuel due to pressure fluctuations and other reasons, ensuring stable transportation of the fuel to the combustion chamber 18, avoiding safety hazards such as fuel leakage, and improving the safety of the burner operation. The welding of the U-shaped pipe 31 with the first pipe 30 and the second pipe 32 is strengthened to ensure the strength and sealing of the connection, preventing problems such as cracking of the weld during operation.

[0051] The exhaust fan 33 installed on the second pipe 32 can enhance the fuel transportation capacity of the right gas feeding structure 3 and accurately control the fuel delivery amount. By adjusting the speed of the exhaust fan 33, the fuel supply can be quickly adjusted according to the operating conditions of the burner, such as starting, stopping, different loads, etc., to ensure the proper ratio of fuel to air, making the combustion more complete and stable. When the burner starts, the exhaust fan 33 operates at a high speed to quickly transport the fuel to the combustion chamber 18, and cooperates with the ignition lance 12 to achieve rapid ignition; during normal operation, the speed of the exhaust fan 33 is adjusted according to the load demand to maintain a stable combustion state; when stopping, the speed of the exhaust fan 33 gradually decreases until it stops operating, ensuring that the burner stops working safely and smoothly.

[0052] The coal inlet 10 is used to add coal to the combustion chamber 18, and the coal passes through the discharge grid 11 to enter the combustion chamber 18. The discharge grid 11 has a moderate mesh size that can ensure the smooth entry of coal into the combustion chamber 18 while preventing large pieces of coal or impurities from entering, avoiding blockage of the internal passages of the burner and ensuring normal operation of the burner. At the same time, the discharge grid 11 allows the coal to be preliminarily dispersed before entering the combustion chamber 18, which is beneficial to the combustion reaction. The discharge grid 11 is tightly fitted with the clamping groove on the inner wall of the body 1, making it easy to install and remove, facilitating regular cleaning and maintenance. After the burner has been operating for a period of time, the discharge grid 11 may be clogged by impurities in the coal. At this time, the discharge grid 11 can be easily removed from the clamping groove for cleaning, ensuring the smoothness of the coal conveying system.

[0053] The ignition lance 12 is used to ignite the fuel mixture in the combustion chamber 18. When the burner starts, the ignition lance 12 is first ignited by controlling the control panel 40, and then the exhaust fan 33 is started to transport the gas. The gas mixes with air in the combustion chamber 18 and is ignited by the ignition lance 12, forming a stable flame. The position and angle of the ignition lance 12 are carefully designed to ensure that the flame can uniformly cover the coal at the bottom of the combustion chamber 18, allowing the coal to ignite and burn smoothly.

[0054] The exhaust flue 15 is used to discharge the waste gas generated by combustion. During combustion, the waste gas generated by combustion forms a certain pressure in the combustion chamber 18 and is discharged through the exhaust flue 15. The size and shape of the exhaust flue 15 are reasonably designed to ensure the smooth discharge of waste gas, reduce exhaust resistance, and avoid adverse effects on the combustion process. The exhaust flue 15 can also be connected to waste gas treatment equipment to purify and treat the waste gas, reducing environmental pollution.

[0055] Pre-start preparation

[0056] Check whether the connections of each part of the burner are firm, including the connections between the body 1 and the base 4, the left gas feeding structure 2 and the left inlet 13, the right gas feeding structure 3 and the right inlet 14, the ignition lance 12 and the body 1, the exhaust fan 33 and the second pipeline 32, etc., to ensure that there is no looseness.

[0057] Check whether the discharge screen 11 is installed in place and whether it is blocked. If it is blocked, it should be cleaned in time.

[0058] Check whether each control button and instrument on the control panel 40 is normal, and ensure that the electrical system connection is normal.

[0059] Check whether the gas supply system is normal, including whether the gas source pressure is stable and whether the pipeline connection is sealed, etc.

[0060] Start the ignition lance 12 through the control panel 40, and the ignition lance 12 starts the ignition operation.

[0061] Start the exhaust fan 33 on the right gas feeding structure 3 and adjust the speed of the exhaust fan 33 to an appropriate value to start feeding gas into the combustion chamber 18. The gas enters the combustion chamber 18 through the first pipeline 30, the U-shaped pipeline 31 and the second pipeline 32.

[0062] Observe the flame condition in the combustion chamber 18. When the flame is stable, gradually increase the speed of the exhaust fan 33 to make the gas supply amount reach the amount required for normal combustion.

[0063] Add an appropriate amount of coal into the combustion chamber 18 through the coal inlet 10. The coal is uniformly dispersed into the combustion chamber 18 under the action of the discharge screen 11 and starts to burn under the action of the flame.

[0064] During the operation of the burner, the operator monitors the operating parameters of the burner in real time through the control panel 40, such as the combustion temperature, gas pressure, air flow, etc.

[0065] According to the combustion condition, the speed of the suction fan 33 is adjusted by the control panel 40 to control the supply of gas, so as to maintain a stable combustion state. When the load increases, the speed of the suction fan 33 is appropriately increased to increase the supply of gas; when the load decreases, the speed of the suction fan 33 is correspondingly reduced to reduce the supply of gas.

[0066] The exhaust condition of the exhaust flue 15 is regularly checked to ensure that the exhaust gas is smoothly discharged without blockage.

[0067] The temperature of the outer shell 100 of the combustor is observed to ensure that the heat preservation layer 102 is working normally, and the temperature of the outer surface of the device body 1 is within a safe range.

[0068] Stop process: gradually reduce the speed of the suction fan 33 on the right gas feeding structure 3 to reduce the supply of gas.

[0069] When the supply of gas is reduced to the minimum safe value, the suction fan 33 is turned off and the supply of gas is stopped.

[0070] The ignition lance 12 is turned off and the ignition operation is stopped.

[0071] After waiting for the fuel in the combustion chamber 18 to be completely burned, the addition of coal to the combustion chamber 18 is stopped.

Claims

1. A coal-fired premix burner for use in a thermal power plant, characterized by, The utility model relates to a kind of gas combustion equipment, including: The left and right sides of the body (1) are respectively fixed with left hanger (16) and right hanger (17) by welding, the front side of the body (1) is connected with the combustion chamber (18) in the body (1) by the spray channel (19) in the middle, the left and right sides of the body (1) are installed on the body (1) by the ignition lance (12) in the lower side by screw connection, the lower side of the body (1) is fixed on the base (4) by bolt connection, the rear of the body (1) is communicated with the inside by the coal inlet (10), the discharge mesh plate (11) is installed in the body (1) by the clamping slot inlay, and the edge of the discharge mesh plate (11) is tightly combined with the inner wall of the body (1); The left and right sides of the upper part are communicated with the combustion chamber (18) by the exhaust flue (15) on the top, the left inlet (13) in the center of the left side and the right inlet (14) in the center of the right side are communicated with the combustion chamber (18); The combustion chamber (18) in the body (1) is hollow structure, there is a gap between the outer shell (100) on the outside and the inner shell (101) on the inside, the outer shell (100) and the inner shell (101) are tightly fixed by screwing a plurality of fastening screws (104), and the outer shell (100) and the inner shell (101) are made of high-temperature-resistant cast steel material, and the connection between the outer shell (100) and the inner shell (101) is firm and reliable; The inner side of the inner shell (101) is provided with a heat preservation layer (102) by bonding, the inner side of the heat preservation layer (102) is provided with a fireproof layer (103) by inlaying, the fireproof layer (103) is made of corundum brick material, the fireproof layer (103) is tightly combined with the heat preservation layer (102) and the inner shell (101), and forms a good heat insulation and fireproof structure together; The left gas feeding structure (2) is connected to the left inlet (13) by flange connection, and is hung by the left hanger (16), which is symmetrical with the right gas feeding structure (3) about the center line of the body (1) and has the same structure, and the components of the left gas feeding structure (2) are connected tightly; The right gas feeding structure (3) is connected to the right inlet (14) by flange connection, and is hung by the right hanger (17), the upper side of the U-shaped pipe (31) is connected with the first pipe (30) by welding, the other side of the upper side is connected with the second pipe (32) by welding, the second pipe (32) is provided with an exhaust fan (33) by bolt connection, and the other end of the second pipe (32) is provided with an external interface (34) by flange connection; The base (4) is fixed with an inner support plate (42) in the middle of the upper end by welding, the inner support plate (42) is fixed with a control panel (40) in the middle by bolt connection, the base (4) is provided with an outer support plate (41) on the left and right sides of the upper end by welding, and the structure of the base (4) can provide a stable support foundation for the body (1).

2. The coal-fired premix burner for thermal power plants according to claim 1, characterized by The inner and outer shells of the device body (1) are tightly connected by fastening screws (104) to form a double-layer structure; the connection between the inner and outer shells not only relies on the fastening force of the fastening screws (104), but also jointly bears the pressure through the reasonable cooperation between the outer shell (100) and the inner shell (101).

3. The coal-fired premix burner for thermal power plants according to claim 1, characterized by The left inlet (13) and the right inlet (14) are symmetrically arranged at the centers of the two side surfaces of the device body (1), so that the fuel is transported from the two sides to the center of the combustion chamber (18), forming a counter-attack type feeding, which effectively promotes the rapid and uniform mixing of the fuel in the combustion chamber (18); the connection between the left inlet (13) and the right inlet (14) and the combustion chamber (18) adopts a smooth transition design to reduce the fuel transportation resistance, and the connection is well sealed to prevent gas leakage.

4. The coal-fired premix burner for thermal power plants according to claim 1, characterized by The thermal insulation layer (102) is made of rock wool material, and the adhesive between the thermal insulation layer (102) and the inner shell (101) has good bonding performance and high temperature resistance.

5. The coal-fired premix burner for thermal power plants according to claim 1, characterized by The fireproof layer (103) is made of corundum brick material, which can effectively block the spread of flame to the internal structure of the device body (1) and prevent the outer shell (100) and the inner shell (101) from being damaged by heat; the inlaid structure between the fireproof layer (103), the thermal insulation layer (102) and the inner shell (101) is tight, preventing the flame from passing through the gap.

6. The coal-fired premix burner for thermal power plants according to claim 1, characterized by The welding positions of the U-shaped pipeline (31) and the first pipeline (30) and the second pipeline (32) are reinforced to ensure the strength and sealing performance of the connection positions.

7. The coal-fired premix burner for thermal power plants according to claim 1, characterized by The exhaust fan (33) is installed on the second pipeline (32) to enhance the fuel transportation capacity of the right gas feeding structure (3), and can quickly adjust the fuel supply when the burner starts and stops to adapt to different working conditions; the connection between the exhaust fan (33) and the second pipeline (32) is sealed by a sealing gasket to ensure that the exhaust fan (33) does not leak during operation.

8. The coal-fired premix burner for thermal power plants according to claim 1, characterized by The control panel (40) is fixed to the middle part of the inner support plate (42) of the base (4); the control panel (40) is connected to each electrical component of the burner through wires, and the wires are arranged reasonably.

9. The coal-fired premix burner for thermal power plants according to claim 1, characterized by The outer support plate (41) is arranged on the upper end face of the base (4) and is used to support the two sides of the device body (1) and work together with the inner support plate (42) to provide a stable support structure for the device body (1); the contact parts of the outer support plate (41) and the base (4) and the device body (1) are buffered by a buffering material.

10. The coal-fired premix burner for thermal power plants according to claim 1, characterized by The discharging mesh plate (11) is located at the coal inlet (10) at the lower part of the device body (1), and the mesh size is moderate, which can ensure the smooth entry of coal into the combustion chamber (18) and prevent large coal or impurities from entering to avoid blocking the internal passage of the burner, and at the same time, the coal is preliminarily dispersed before entering the combustion chamber (18), which is beneficial to the combustion reaction; the discharging mesh plate (11) is tightly matched with the clamping groove of the inner wall of the device body (1).

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