Coal water slurry jacket type burner

Abstract

The utility model belongs to the technical field of coal water slurry burners, and relates to a coal water slurry jacket type burner, which comprises a burner main body, a central oxygen spray head, a central oxygen supply pipe, a durable burner head, an inner side cooling cavity and an outer side cooling cavity, according to the utility model, the inner-outer double-layer water cooling structure is adopted, the double-layer water cooling structure is sleeved on the outer circumference of the burner main body, and the through part of the inner-outer double-layer structure is positioned on the outer side of the durable burner head, so that the heat dissipation area is increased, and therefore, during cooling, the heat dissipation of the burner main body is more uniform, and the heat dissipation effect at the durable burner head is better; therefore, the heat dissipation efficiency of the burner body and the durable burner head is improved, and the durable burner head is prevented from being burnt due to untimely cooling or unbalanced cooling of the burner body.

Description

Technical Field

[0001] The utility model belongs to the technical field of water-coal slurry burners and particularly relates to a water-coal slurry jacketed burner. Background Art

[0002] The Texaco process burner is a key equipment of the gasification device. It is generally a three-channel external mixing type. The coal slurry is fully atomized by the high-speed oxygen flow in the burner to facilitate the gasification reaction. Since the Texaco burner is inserted into the combustion chamber of the gasifier and withstands a high temperature of about 1400 degrees, in order to prevent the burner from being damaged, a cooling coil is set on the outside of the burner, a water chamber is set at the burner head, and a separate system supplies cooling water to the burner. The basic process of Texaco water-coal slurry pressurized gasification is to use a high-pressure coal slurry pump to send the coal slurry into the burner, and at the same time, the high-pressure oxygen from the air separation is also sent into the burner. The oxygen goes through the outer annular gap and the center tube of the burner, and the coal slurry goes through the inner annular gap. The two are sprayed into the gasifier by the burner together, fully mixed and atomized, and the gasification reaction is carried out at a temperature of 1350-1400℃. The generated high-temperature synthesis gas and molten slag flow through the slag mouth, the quenching ring, and the downcomer together, and enter the quenching water in the quenching chamber. The high-temperature synthesis gas and molten slag are directly contacted with quenching water for quenching. The purpose of quenching is to cool the high-temperature gas directly to the saturated steam temperature under the pressure, cool the molten slag and deposit it to achieve gas-slag separation. The separated slag is discharged into the slag pool through the slag crusher through the lock bucket regularly, and the mountain slag picker is taken out and loaded for transportation. The quenching water is pulled out from the washing tower by the quenching water pump, sent to the quenching ring, and rotated and evenly distributed along the inner wall of the downcomer. The water film formed by the quenching water on the inner wall of the downcomer not only prevents the high-temperature airflow and the pipe slag from directly contacting the inner wall of the downcomer to protect the downcomer, but also gradually reduces the gas temperature. The synthesis gas quenched in the quenching water bubbles and rises evenly along the annular space of the downcomer and the riser. After leaving the quenching chamber, it is further cooled and dusted by the Venturi scrubber and the washing tower, and then sent to the CO conversion. The water-coal slurry and 99.6% pure oxygen enter the gasifier in the form of a jet through the Texaco burner, and undergo a gasification reaction at high temperature and high pressure to generate a crude synthesis gas with CO+H2 as the main component.

[0003] The water-coal slurry process burner technology is one of the most critical technologies in the water-coal slurry gasification technology. It directly determines the efficiency of the process technology and the stability of the system. The water-coal slurry gasification process burner is a three-channel internal and external mixed atomization form. The outer flow channel and the inner flow channel convey high-pressure oxygen, and the middle flow channel conveys high-pressure water-coal slurry. After the secondary oxygen (central oxygen) is semi-premixed with the coal slurry, it is mixed with the primary oxygen (external epoxy) for atomization, combustion and gasification. A cooling water coil is installed outside the burner head, and the cooling water flows into the head water chamber for cooling;

[0004] However, the head of the existing water-coal slurry burner is subjected to high-temperature heating for a long time and the heat dissipation effect is poor, which causes the water-coal slurry burner to shorten the material fatigue period and even cause the burner to crack due to uneven heat dissipation. Replacing the entire nozzle is costly and inconvenient. In response to the above problems, the utility model proposes a water-coal slurry jacketed burner to solve the above problems. Utility Model Content

[0005] The technical solution adopted by the utility model to solve the technical problem is: a water-coal slurry jacketed burner, comprising: a long cylindrical burner body, a cylindrical central oxygen nozzle is arranged in the head cavity of the burner body, the tail of the central oxygen nozzle is connected to the central oxygen supply pipe, a water-coal slurry nozzle is arranged in the head cavity of the burner body, the water-coal slurry nozzle is in a conical cylinder shape, the radial size of the inner cone of the water-coal slurry nozzle gradually decreases along the injection direction, the nozzle of the central oxygen nozzle is located in the conical cylinder of the water-coal slurry nozzle, the burner body, the central oxygen nozzle and the water-coal slurry nozzle are coaxial, the nozzle of the central oxygen nozzle is axially contracted in the conical cylinder of the water-coal slurry nozzle, and the head of the burner body is provided with a plurality of A cylindrical durable burner head is made of stacked materials, and an external thread is provided on the outer circumference of the durable burner head, and an internal thread is provided on the inner wall of the injection port of the burner main body head, and the external thread and the internal thread are used in threaded cooperation with each other; the durable burner head is threadedly connected to the injection port of the burner main body head, and the durable burner head and the burner main body are connected with threads in a separate manner, so that when the burner is damaged due to high-temperature environment, there is no need to replace the entire burner main body, and only the durable burner head at the front end and the highest temperature part which is most easily burned needs to be replaced, and the threaded connection replacement is simple, convenient and quick, so it reduces the cost of burning and replacement and improves the efficiency of replacement compared with the previous method of integrating the burner main body and the burner head.

[0006] Preferably, a cylindrical inner cooling chamber is wrapped around the outer side of the cylinder of the burner body, and a cylindrical outer cooling chamber is wrapped around the outer side of the cylinder of the inner cooling chamber, the inner cooling chamber and the outer cooling chamber are connected on one side of the nozzle of the burner body, a first water inlet is fixedly penetrated through the outer side of the burner body, the first water inlet is communicated with an end of the inner cooling chamber away from the nozzle of the burner body, and a second water inlet is fixedly penetrated through the outer side of the burner body, the second water inlet is communicated with an end of the outer cooling chamber away from the nozzle of the burner body; a double-layer surrounding water cooling method is adopted to cool the burner body and the durable burner head, and two cooling water circulation methods of outer water inlet and inner layer drainage or inner water inlet and outer layer drainage can be selected, the circulation point of the inner and outer layers of water is located on the outer side of the durable burner head, so that the cooling water can circulate through the durable burner head to cool the durable burner head, thereby preventing the durable burner head from burning due to untimely cooling or uneven cooling of the burner body.

[0007] Preferably, the laminated material layers of the durable burner head are provided in order from the outside to the inside: a base material layer, a heat-insulating layer and a wear-resistant layer; the innermost layer of the durable burner head is a wear-resistant layer, which improves the wear resistance of the nozzle of the durable burner head when subjected to high-speed friction of high-pressure fuel fluid; the middle layer is a heat-insulating layer, which reduces the efficiency of external high temperature conduction to the inner layer; and the outermost layer is a base material layer, which provides support and a carrier for the heat-insulating layer and the wear-resistant layer.

[0008] Preferably, a supply pipe is provided at the tail of the water-coal slurry nozzle, and the supply pipe is cylindrical. The supply pipe is sleeved outside the central oxygen supply pipe, and the burner body is sleeved outside the supply pipe. The central oxygen supply pipe, the supply pipe and the burner body are coaxial. The central oxygen supply pipe, the supply pipe and the burner body are sleeved in sequence to form a multi-layer concentric sleeve-shaped multi-channel pipeline; the concentric sleeve-shaped multi-channel pipeline can facilitate the connection of different channels in the burner body to the inner layer oxygen, the outer layer oxygen and the intermediate fuel.

[0009] Preferably, a circular mounting plate is fixedly provided at one end of the durable burner head, and a side of the mounting plate away from the durable burner head is provided with symmetrically distributed notches in a ring shape, and the notches are in the shape of square grooves; the notches are used for clamping and disassembling tools to grasp the circular plate of the durable burner head for installation or removal.

[0010] Preferably, the end surface of the durable burner head away from the mounting plate is a sloped structure; the sloped structure can reduce the impact on the high-pressure and high-speed injection fuel flow in the water-coal slurry nozzle.

[0011] Preferably, a coaxial annular flange is fixedly provided on the outer side of the burner body; the flange is used for fixedly mounting and docking the inner cooling cavity and the outer cooling cavity.

[0012] The beneficial effects of the utility model are:

[0013] 1. The utility model adopts an inner and outer double-layer water-cooling structure, and the double-layer water-cooling structure is sleeved on the outer circumference of the burner body. The penetration of the inner and outer double-layer structure is located on the outside of the durable burner head, which increases the heat dissipation area. Therefore, when cooling, the heat dissipation of the burner body is more uniform, and the heat dissipation effect at the durable burner head is better, thereby improving the heat dissipation efficiency of the burner body and the durable burner head, thereby preventing the durable burner head from burning due to untimely cooling or uneven cooling of the burner body.

[0014] 2. The wear-resistant layer can increase the service life of the durable burner head, and the heat-insulating layer can reduce the impact of high temperature on the substrate. The mounting plate is rotated through the notch, and the mounting plate drives the durable burner head to rotate, so that the durable burner head is taken out from the burner body. The external threads cooperate with each other to fix the durable burner head in the burner body, so that the durable burner head can be easily replaced. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1It is a structural schematic diagram of a water-coal slurry jacketed burner.

[0016] Figure 2 for Figure 1 A is an enlarged view of the structure.

[0017] Figure 3 Schematic diagram of the layers of durable nozzle tip materials.

[0018] In the figure, 1. burner body; 2. central oxygen nozzle; 3. central oxygen supply pipe; 4. durable burner head; 5. mounting plate; 6. external thread; 7. internal thread; 8. inner cooling chamber; 9. outer cooling chamber; 10. notch; 11. second water inlet; 12. first water inlet; 13. water-coal slurry nozzle; 14. supply pipe; 15. flange; 41. base material layer; 42. thermal insulation layer; 43. wear-resistant layer. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the relevant technologies in the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] refer to Figures 1 to 3 A water-coal slurry jacketed burner, comprising: a long cylindrical burner body 1, a cylindrical central oxygen nozzle 2 is arranged in the head cavity of the burner body 1, the tail of the central oxygen nozzle 2 is connected to the central oxygen supply pipe 3, a water-coal slurry nozzle 13 is arranged in the head cavity of the burner body 1, the water-coal slurry nozzle 13 is in a conical cylinder shape, the radial size of the inner cone of the water-coal slurry nozzle 13 gradually decreases along the injection direction, the nozzle of the central oxygen nozzle 2 is located in the conical cylinder of the water-coal slurry nozzle 13, the burner body 1, the central oxygen nozzle 2, and the water-coal slurry nozzle 13 are coaxial, the nozzle of the central oxygen nozzle 2 is axially contracted in the conical cylinder of the water-coal slurry nozzle 13, and the head of the burner body 1 is provided with a plurality of materials in a stacked shape A cylindrical durable burner head 4 is manufactured, and an external thread 6 is provided on the outer circumference of the durable burner head 4, and an internal thread 7 is provided on the inner wall of the head injection port of the burner body 1, and the external thread 6 and the internal thread 7 are threadedly matched with each other; the durable burner head 4 is threadedly connected to the head injection port of the burner body 1, and the durable burner head 4 is threadedly connected to the burner body 1 in a separate manner, so that after the burner is damaged due to a high-temperature environment, there is no need to replace the entire burner body 1, and only the durable burner head 4 at the front end and the highest temperature part which is most easily burned needs to be replaced, and the threaded connection replacement is simple, convenient and quick, so compared with the previous method of integrating the burner body 1 with the burner head, the cost of burning and replacement is reduced and the efficiency of replacement is improved.

[0021] Furthermore, the outer side of the cylinder of the burner body 1 is surrounded by a cylindrical inner cooling chamber 8, and the outer side of the cylinder of the inner cooling chamber 8 is surrounded by a cylindrical outer cooling chamber 9. The inner cooling chamber 8 and the outer cooling chamber 9 are connected on one side of the nozzle of the burner body 1. A first water inlet 12 is fixedly penetrated on the outer side of the burner body 1, and the first water inlet 12 is connected to the end of the inner cooling chamber 8 away from the nozzle of the burner body 1. A second water inlet 11 is fixedly penetrated on the outer side of the burner body 1, and the second water inlet 11 is connected to the outer cooling chamber 8. The cooling chamber 9 is connected to the end of the nozzle away from the burner body 1; the burner body 1 and the durable burner head 4 are cooled by a double-layer surrounding water cooling method, and two cooling water circulation methods can be selected, namely, outer water inlet and inner water outlet or inner water inlet and outer water outlet. The circulation point of the inner and outer water layers is located on the outside of the durable burner head 4, so the cooling water can circulate through the durable burner head 4 to cool the durable burner head 4, thereby preventing the durable burner head 4 from burning due to untimely cooling or uneven cooling of the burner body 1.

[0022] Furthermore, the laminated material layers of the durable burner head 4 are provided in sequence from the outside to the inside: a base material layer 41, a heat insulating layer 42 and a wear-resistant layer 43; the innermost layer of the durable burner head 4 is the wear-resistant layer 43, which improves the wear resistance of the nozzle of the durable burner head 4 when subjected to high-speed friction of high-pressure fuel fluid; the middle layer is the heat insulating layer 42, which reduces the efficiency of external high temperature conduction to the inner layer; and the outermost layer is the base material layer 41, which provides support and a carrier for the heat insulating layer 42 and the wear-resistant layer 43.

[0023] Furthermore, a supply pipe 14 is provided at the tail of the water-coal slurry nozzle 13. The supply pipe 14 is cylindrical and is sleeved outside the central oxygen supply pipe 3. The burner body 1 is sleeved outside the supply pipe 14. The central oxygen supply pipe 3, the supply pipe 14 and the burner body 1 are coaxial. The central oxygen supply pipe 3, the supply pipe 14 and the burner body 1 are sleeved in sequence to form a multi-layer concentric sleeve-shaped multi-channel pipeline; the concentric sleeve-shaped multi-channel pipeline can facilitate the connection of different channels in the burner body 1 to the inner oxygen, outer oxygen and intermediate fuel.

[0024] Furthermore, a circular mounting plate 5 is fixedly provided at one end of the durable burner head 4, and a symmetrically distributed notch 10 is formed in a ring shape on one side of the mounting plate 5 away from the durable burner head 4, and the notch 10 is in the shape of a square groove; the notch 10 is used for clamping and disassembling tools to grasp the circular disc of the durable burner head 4 for installation or removal.

[0025] Furthermore, the end surface of the durable burner head 4 away from the mounting plate 5 is a sloped structure; the sloped structure can reduce the impact on the high-pressure and high-speed injection fuel flow in the water-coal slurry nozzle 13.

[0026] Furthermore, a coaxial annular flange 15 is fixedly provided on the outer side of the burner body 1 ; the flange 15 is used for fixedly mounting and docking the inner cooling cavity 8 and the outer cooling cavity 9 .

[0027] Example

[0028] In this embodiment, a technical solution is provided: a water-coal slurry jacketed burner, such as Figure 1-3 As shown, it includes a burner body 1, a central oxygen nozzle 2 is arranged at the head of the burner body 1, a central oxygen supply pipe 3 is fixedly arranged at the tail of the central oxygen nozzle 2, a water-coal slurry nozzle 13 is arranged at the head of the burner body 1, and the water-coal slurry nozzle 13 is located on the outside of the central oxygen nozzle 2, a durable burner head 4 is arranged at the head of the burner body 1, an external thread 6 is provided on the outside of the durable burner head 4, an internal thread 7 is provided on the inner wall of the head of the burner body 1, the external thread 6 and the internal thread 7 are used in conjunction with each other, and the durable burner head 4 is fixed in the burner body 1 through the cooperation between the internal thread 7 and the external thread 6, so that the durable burner head 4 can be easily replaced.

[0029] The outer side of the burner body 1 is surrounded by an inner cooling cavity 8, the outer side of the inner cooling cavity 8 is surrounded by an outer cooling cavity 9, one end of the inner cooling cavity 8 is connected with one end of the outer cooling cavity 9, a first water inlet 12 is fixedly penetrated through the outer side of the burner body 1, the first water inlet 12 is connected with one end of the inner cooling cavity 8, a second water inlet 11 is fixedly penetrated through the outer side of the burner body 1, and one end of the second water inlet 11 is connected with one end of the outer cooling cavity 9.

[0030] By adopting the above technical solution, the inner wall of the inner cooling chamber 8 is "surrounded and wrapped" on the outer wall of the burner head. When the cooling water enters the inner cooling chamber 8 from the first water inlet 12, circulates to the outer cooling chamber 9 and finally flows out from the second water inlet 11, it is a cooling method from the inside to the outside. The cooling water enters the inner cooling chamber 8 through the first water inlet 12, so that the cooling water absorbs the heat inside the burner body 1. After passing through the through-hole outside the durable burner head 4, the durable burner head 4 is cooled in time, and then enters the outer cooling chamber 9 to absorb the heat outside the burner body 1, and is discharged through the second water inlet 11, so that the heat exchange area of ​​the burner body 1 can be increased, thereby achieving the purpose of improving the cooling effect; in this case, the cold water directly cools the burner body 1, and the cooling effect is good, but the heat exchange is more intense, and the impact on the material of the burner body 1 is relatively large. When the cooling water enters the outer cooling chamber 9 from the second water inlet 11 and then circulates to the inner cooling chamber 8 and finally flows out from the first water inlet 12, it is a cooling method from outside to inside. The cooling water enters the outer cooling chamber 9 through the second water inlet 11, and the initial cold water in the outer cooling chamber 9 is preheated by the heat exchange between the common cylinder wall of the outer cooling chamber 9 and the inner cooling chamber 8. At the same time, it can prevent the temperature difference between the low temperature of the initial cold water and the high temperature of the outer wall of the burner body 1 from being too large to impact the material of the burner body 1. When the preheated cooling water flows through the through-hole outside the durable burner head 4, the durable burner head 4 is cooled in time, and then enters the inner cooling chamber 8, the cooling water The burner body 1 is cooled by absorbing the heat from the outer wall of the burner body 1, and at the same time, part of the heat is transferred to the initial cold water newly entering the outer cooling chamber 9 through the heat exchange between the common cylinder wall of the outer cooling chamber 9 and the inner cooling chamber 8, absorbing heat while dissipating heat, and the temperature difference between the cooling water in the inner cooling chamber 8 and the outer wall of the burner body 1 is small, which reduces the thermal shock to the material of the burner body 1. Finally, the cooling water in the inner cooling chamber 8 absorbs heat and finally flows out from the first water outlet 12. In this case, the cold water is gradually heated and then cooled down the burner body 1, the cooling effect is good, the heat exchange is softer, and the impact on the material of the burner body 1 is smaller.

[0031] The durable burner head 4 comprises a substrate 41 , a heat insulating layer 42 and a wear-resistant layer 43 . The heat insulating layer 42 is arranged on one side of the substrate 41 , and the wear-resistant layer 43 is arranged on the side of the heat insulating layer 42 away from the substrate 41 .

[0032] By adopting the above technical solution, the service life of the durable burner head 4 can be increased through the wear-resistant layer 43 , and the influence of high temperature on the substrate 41 can be reduced through the heat insulation layer 42 , thereby extending the service life of the durable burner head 4 .

[0033] A supply pipe 14 is provided at the tail of the water-coal slurry nozzle 13 , and the supply pipe 14 is located between the central oxygen supply pipe 3 and the burner body 1 .

[0034] By adopting the above technical solution, the supply pipe 14 can conveniently supply water-coal slurry to the water-coal slurry nozzle 13 .

[0035] A mounting plate 5 is fixedly provided at one end of the durable burner head 4 , and a side of the mounting plate 5 away from the durable burner head 4 is provided with symmetrically distributed notches 10 .

[0036] By adopting the above technical solution, the mounting plate 5 is rotated through the notch 10 , and the mounting plate 5 drives the durable burner head 4 to rotate, so that the durable burner head 4 can be easily taken out from the burner body 1 .

[0037] A flange 15 is fixedly provided on the outer side of the burner body 1 .

[0038] By adopting the above technical solution, the burner body 1 is installed and fixed through the flange 15 .

[0039] One end of the durable burner head 4 away from the mounting plate 5 is a sloped structure.

[0040] By adopting the above technical solution, the inclined surface structure can reduce the impact on the water-coal slurry nozzle 13.

[0041] Working principle: First, the burner body 1 is installed and fixed through the flange 15, and then oxygen is supplied to the central oxygen nozzle 2 through the central oxygen supply pipe 3, and water-coal slurry is supplied to the water-coal slurry nozzle 13 through the supply pipe 14. The water-coal slurry and 99.6% pure oxygen enter the gasifier in a jet shape through the burner body 1, and gasification reaction is carried out under high temperature and high pressure to generate a crude synthesis gas with CO+H2 as the main component, so that the temperature of the burner body 1 is increased, and at the same time, cooling water enters the inner cooling chamber 8 through the first water inlet 12, so that the cooling water absorbs the heat inside the burner body 1, and enters the outer cooling chamber 9 to absorb the heat outside the burner body 1, and is discharged through the second water inlet 11, so that the heat exchange area of ​​the burner body 1 can be increased, so as to achieve the purpose of improving the cooling effect, and the wear-resistant layer 43 can increase the service life of the durable burner head 4, and the heat insulation layer 42 reduces the influence of high temperature on the substrate 41, so as to extend the service life of the durable burner head 4;

[0042] When the durable burner head 4 needs to be replaced, the mounting plate 5 is rotated through the notch 10, and the mounting plate 5 drives the durable burner head 4 to rotate, so that the durable burner head 4 is taken out from the burner body 1, and the new durable burner head 4 is fixed in the burner body 1 between the internal thread 7 and the external thread 6, so that the durable burner head 4 can be easily replaced.

[0043] To sum up, the utility model adopts an inner and outer double-layer water-cooling structure, and the double-layer water-cooling structure is sleeved on the outer circumference of the burner body, and the penetration point of the inner and outer double-layer structure is located on the outside of the durable burner head, thereby increasing the heat dissipation area. Therefore, when cooling, the heat dissipation of the burner body is more uniform, and the heat dissipation effect at the durable burner head is better, thereby improving the heat dissipation efficiency of the burner body and the durable burner head, thereby preventing the durable burner head from burning due to untimely cooling or uneven cooling of the burner body. Therefore, the utility model has broad application prospects.

[0044] It should be emphasized that the above are only preferred embodiments of the present invention and do not constitute any form of limitation to the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A water-coal slurry jacketed burner, comprising a long cylindrical burner body (1), characterized in that: The head cavity of the burner body (1) is provided with a cylindrical central oxygen nozzle (2), the tail of the central oxygen nozzle (2) is connected to the central oxygen supply pipe (3), the head cavity of the burner body (1) is provided with a water-coal slurry nozzle (13), the water-coal slurry nozzle (13) is in the shape of a conical cylinder, the radial dimension of the inner cone of the water-coal slurry nozzle (13) gradually decreases along the injection direction, the nozzle of the central oxygen nozzle (2) is located in the conical cylinder of the water-coal slurry nozzle (13), and the burner body (1) and the central oxygen nozzle (2) are connected to the central oxygen supply pipe (3). The central oxygen nozzle (2) and the water-coal slurry nozzle (13) are coaxial, and the nozzle of the central oxygen nozzle (2) is axially contracted in the conical cylinder of the water-coal slurry nozzle (13). The head of the burner body (1) is provided with a cylindrical durable burner head (4) made of a plurality of stacked materials, and the outer circumference of the durable burner head (4) is provided with an external thread (6). The inner wall of the injection port of the head of the burner body (1) is provided with an internal thread (7), and the external thread (6) and the internal thread (7) are threadedly matched with each other for use.

2. A water-coal slurry jacketed burner as claimed in claim 1, characterized in that: The outer side of the cylinder of the burner body (1) is surrounded by a cylindrical inner cooling cavity (8), and the outer side of the cylinder of the inner cooling cavity (8) is surrounded by a cylindrical outer cooling cavity (9). The inner cooling cavity (8) and the outer cooling cavity (9) are connected on one side of the nozzle of the burner body (1). A first water inlet (12) is fixedly penetrated on the outer side of the burner body (1), and the first water inlet (12) is connected to an end of the inner cooling cavity (8) away from the nozzle of the burner body (1). A second water inlet (11) is fixedly penetrated on the outer side of the burner body (1), and the second water inlet (11) is connected to an end of the outer cooling cavity (9) away from the nozzle of the burner body (1).

3. A water-coal slurry jacketed burner as claimed in claim 1, characterized in that: The laminated material layers of the durable burner head (4) are provided in sequence from the outside to the inside: a base material layer (41), a heat insulation layer (42) and a wear-resistant layer (43).

4. A water-coal slurry jacketed burner as claimed in claim 1, characterized in that: A supply pipe (14) is provided at the tail of the water-coal slurry nozzle (13). The supply pipe (14) is cylindrical and is sleeved outside the central oxygen supply pipe (3). The burner body (1) is sleeved outside the supply pipe (14). The central oxygen supply pipe (3), the supply pipe (14) and the burner body (1) are coaxial. The central oxygen supply pipe (3), the supply pipe (14) and the burner body (1) are sleeved in sequence to form a multi-layer concentric sleeve-shaped multi-channel pipeline.

5. The water-coal slurry jacketed burner according to claim 1, characterized in that: A circular mounting plate (5) is fixedly provided at one end of the durable burner head (4), and a side of the mounting plate (5) away from the durable burner head (4) is provided with symmetrically distributed notches (10) in a circular shape, and the notches (10) are in the shape of square grooves.

6. A water-coal slurry jacketed burner as claimed in claim 5, characterized in that: The end surface of the durable burner head (4) away from the mounting plate (5) is a sloped structure.

7. A water-coal slurry jacketed burner as claimed in claim 1, characterized in that: A coaxial annular flange (15) is fixedly provided on the outer side of the burner body (1).

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