CN110577846A

CN110577846A - Combustion system and burner

Info

Publication number: CN110577846A
Application number: CN201910867415.1A
Authority: CN
Inventors: 杨建平
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-09-12
Filing date: 2019-09-12
Publication date: 2019-12-17
Anticipated expiration: 2039-09-12
Also published as: CN110577846B

Abstract

The invention belongs to the field of coal gasification combustion, and relates to a combustion system and a burner. The combustion system comprises a control system, a burner and a gasification furnace which are sequentially connected, wherein the burner comprises a cooling water jacket and an outer sleeve, and the cooling water jacket is of an annular cavity-shaped structure and is arranged inside the outer sleeve; the first outer wall of the cooling water jacket forms a central channel of the burner, and the second outer wall of the cooling water jacket and the inner wall of the outer sleeve form a nitrogen channel. The invention controls the installation angle of the opposed burner with a special structure and the gasification furnace wall to be 17-20 degrees, controls the rotational flow angle of the air supply outlet of the burner to be 1-30 degrees, and can effectively avoid the problems of partial burning, channeling and the like of the gasification furnace.

Description

combustion system and burner

Technical Field

The invention belongs to the field of coal gasification combustion, relates to a combustion system and a burner, and particularly relates to a combustion system and a burner for forcibly supplying air into a pressurized high-temperature coal bed.

Background

Coal gasification refers to the process of converting solid fuels such as coal, coke, semi-coke, etc. into gas products and a small amount of residues by reacting with a gasification agent under the conditions of high temperature, normal pressure or pressurization. Traditional coal gasifier adopts resistant firebrick as the inside lining, and resistant firebrick can be washed away and erodeed because of high temperature gas on the one hand, and on the other hand resistant firebrick needs the periodic replacement because of its temperature resistant limit condition. Therefore, the coal gasifier at present basically adopts a water-cooled wall liner structure to utilize a solid slag layer on the water-cooled wall to resist slag. Theoretically, the operation temperature of the coal gasification furnace can reach 1900 ℃, so that the water-cooled wall type gasification furnace becomes the necessary choice for the current coal gasification reaction furnace. However, the water-cooled wall type gasification furnace does not store heat of refractory bricks in the temperature rise stage of the gasification furnace, so that ignition preheating and normal operation continuous operation of the gasification furnace are required.

however, the traditional gasifier burner adopts a refractory brick high-temperature burner, the combustion temperature at the bottom of the gasifier reaches 1400-1700 ℃, and the service life of refractory bricks is greatly reduced. In addition, the alloy material of high temperature resistance is adopted with the slag contact site to comparatively common traditional nozzle, and the heat conduction part adopts the red copper preparation to form, and the heat conduction part is equipped with inside cooling tube, will take away in order to avoid damaging a little with slag contact site head heat. However, in the actual situation, the cooling pipe cannot enter the high-temperature head part, and only can take away the heat of the burner through heat conduction, so that the head part of the burner needs to be subjected to surfacing repair and rush repair almost every month, the normal operation of the whole gasification device is influenced, and huge economic loss is brought to enterprises.

In addition, due to the unreasonable nozzle distribution and uneven distribution of air supply outlets of the existing combustion system, the gasification furnace has the problems of partial burning, channeling and the like, and further causes the defects of slag layer melting, coal gas quality reduction (high content of CO 2), high coal gas temperature and the like. Therefore, the shutdown is needed to deal with the problems of partial burning and channeling when necessary, and unnecessary economic loss is caused to production enterprises.

Therefore, the stable combustion system and burner which can meet the severe operation condition of the gasification furnace are needed in the field.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, the present invention provides a combustion system and burner.

Specifically, the combustion system comprises a control system, a burner and a gasification furnace which are sequentially connected, wherein the burner comprises a cooling water jacket and an outer sleeve, and the cooling water jacket is of an annular cavity-shaped structure and is arranged inside the outer sleeve; the first outer wall of the cooling water jacket forms a central channel of the burner, and the second outer wall of the cooling water jacket and the inner wall of the outer sleeve form a nitrogen channel.

The central channel is provided with at least one air supply outlet, and the air supply direction of the air supply outlet is inclined by 1-30 degrees with the vertical direction of the axis of the central channel.

Wherein the included angle between the burner and the wall of the gasification furnace is 17-20 degrees.

The outer sleeve is composed of a water-cooled wall and a silicon carbide layer, and the thickness of the silicon carbide layer is 10-15 mm.

The cooling water jacket comprises a water inlet channel and a water outlet channel, and a rotational flow plate is arranged in the water inlet channel.

the burners are arranged in the gasification furnace in an opposite mode, and the number of the burners is at least 4.

Wherein the control system comprises an oxygen preheating control system and a water vapor control system; the oxygen preheating control system comprises a cold oxygen supply device, a cold oxygen stop valve, a cold oxygen regulating valve, an oxygen preheater, a first hot oxygen stop valve and a second hot oxygen stop valve which are sequentially connected in series, wherein a cold oxygen blow-down valve is arranged between the cold oxygen stop valve and the cold oxygen regulating valve, and a hot oxygen blow-down valve is arranged between the oxygen preheater and the first hot oxygen stop valve; the steam control system comprises a steam supply device, a steam stop valve and a steam regulating valve which are sequentially connected in series, wherein a steam vent valve is arranged between the steam stop valve and the steam regulating valve.

On the other hand, the invention provides a burner which comprises a cooling water jacket and an outer sleeve, wherein the cooling water jacket is in an annular cavity structure and is arranged inside the outer sleeve; the first outer wall of the cooling water jacket forms a central channel of the burner, and the second outer wall of the cooling water jacket and the inner wall of the outer sleeve form a nitrogen channel.

The technical scheme of the invention has the following beneficial effects:

1. According to the burner, the cooling water jacket, the nitrogen channel and the outer sleeve are coaxially arranged outside the central channel in sequence to form the jacket type burner with double-layer cooling and refractory coating, so that the temperature of the burner is reduced, the softening and deformation of the burner at high temperature are avoided, and the problem of burning loss of the head of the burner caused by poor heat conduction effect of the traditional burner is effectively solved, therefore, the burner can continuously and stably operate in a gasification furnace for gasifying lump coal at 4.0-8.0MPa and 1400-1700 ℃;

2. The mounting angle of the opposed burner and the gasification furnace wall is controlled to be 17-20 degrees, the rotational flow angle of the air supply outlet of the burner is controlled to be 1-30 degrees, the gas jet distance output by the central channel can be furthest, and air/oxygen-rich air/oxygen and water vapor can form a high-temperature jet region composed of gas, liquid and solid phases with coal at the lower part of the furnace body to the greatest extent, so that the problems of partial combustion, channeling and the like of the gasification furnace are avoided;

3. According to the invention, the silicon carbide layer is arranged on the outer side of the water-cooled wall, so that the burner can be prevented from being damaged by expansion extrusion of a coal bed and external falling force, and the service life of the burner is prolonged;

4. the cooling water jacket directly extends into the head of the burner, so that heat is effectively and quickly conducted, the temperature of the head of the burner is not too high, and the service life of the burner is further prolonged;

5. According to the invention, the nitrogen channel is arranged on the outer side of the cooling water jacket, so that on one hand, nitrogen can be premixed with air/oxygen-enriched/pure oxygen and steam sprayed out of the central channel at the outlet, the air flow entering a coal bed is more uniform, and on the other hand, the secondary cooling of the burner can be realized by virtue of the nitrogen with lower temperature.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention.

FIG. 1 is a schematic axial sectional view of a burner according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of the distribution of the central channel air outlets of the burner in one embodiment of the present invention;

FIG. 3 is a schematic view of the air flow angle of the air supply opening;

FIG. 4 is a schematic view of the combustion system of the present invention;

FIG. 5 is a schematic view of a high velocity jet zone formed by a burner in a gasifier;

FIG. 6 is a schematic view of the angle at which the burner tip is inserted into the gasifier wall;

FIG. 7 is a schematic diagram of the control system of the combustion system of the present invention.

Reference numerals: 10 is a burner, 11 is a cooling water jacket, 111 is a first outer wall of the cooling water jacket, 112 is a second outer wall of the cooling water jacket, 12 is an outer sleeve, 121 is a water wall, 122 is a silicon carbide layer, 13 is a central channel, 131 is a reserved central ignition channel, 132 is an air supply opening, 14 is a nitrogen channel, 20 is a combustion system, 30 is a control system, 31 is an oxygen preheating control system, 311 is a cold oxygen supply device, 312 is a cold oxygen shut-off valve, 313 is a cold oxygen regulating valve, 314 is an oxygen preheater, 315 is a first hot oxygen shut-off valve, 316 is a second hot oxygen shut-off valve, 317 is a cold oxygen blow-off valve, 318 is a hot oxygen blow-off valve, 32 is a water vapor control system, 321 is a steam supply device, 322 is a steam shut-off valve, 323 is a steam regulating valve, 324 is a steam blow-off valve, 40 is a gasification furnace, 401 is a material layer, and 402 is a high-.

Detailed Description

in order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Need stretch into the gasifier bottom with the nozzle in the coal gasification production process, because gasifier bottom temperature is high, pressure is big, hardly finds the material that can guarantee the long-time work of nozzle in this environment, traditional metal heat conduction formula design extremely fragile in this harsh environment, has caused huge economic loss for the enterprise. Therefore, the invention discloses a combustion system and a burner, which aim to realize long-term continuous and stable air supply of the burner.

Specifically, fig. 4 is a schematic structural diagram of the combustion system of the present invention, and the combustion system 20 includes a control system 30, a burner 10, and a gasification furnace 40, which are connected in sequence. As shown in fig. 1, the burner 10 includes a cooling water jacket 11 and an outer sleeve 12, the cooling water jacket 11 is an annular cavity-shaped structure and is disposed inside the outer sleeve 12; the first outer wall 111 of the cooling water jacket 11 forms a central channel 13 of the burner, and the second outer wall 112 of the cooling water jacket 11 and the inner wall of the outer sleeve 12 form a nitrogen channel 14.

Preferably, the burners 10 are arranged in the gasification furnace 40 in an opposed manner, and the number of the burners 10 is at least 4.

Fig. 5 is a schematic diagram of a high-speed jet region formed in the gasification furnace 40 by the burner 10, and as shown in fig. 5, the high-temperature gas flow ejected from the nozzle 10 stirs the coal material to form a high-temperature jet region 402, which forms good material mixing for combustion and gasification reactions.

The number of the burners 10 is determined according to the uniformity of the high-speed jet area 402 formed by the air supply of the burners of the combustion system, wherein the burners 10 are large in number and are symmetrically arranged, so that the air supply is mixed. The number of the burners 10 is preferably 8, the mixing degree of the high-speed jet area formed by the 8 burners in the hearth can well meet the production requirement, and if the number of the burners exceeds 8, the difficulty of equipment opening and the process cost can be increased, so that waste is caused.

Fig. 6 is a schematic view of the angle of the burner 10 inserted into the gasification furnace wall, the opposed burner 10 is adopted to supply air, and the installation angle of the opposed burner 10 is controlled to be 17-20 degrees, so that the gas jet distance output by the central channel 14 can be furthest, and further, the air/rich oxygen/oxygen and water vapor can form a high-temperature jet region 402 with the coal material at the lower part of the furnace body 40 to the greatest extent.

Wherein, the flow rate of the air/rich oxygen/oxygen and water vapor in the central channel 13 is related to the angle of the nozzle 10 entering the gasification furnace 40 and the caliber of the burner 10. Specifically, the larger the caliber of the burner 10 is at the same gas velocity, the deeper the jet depth of the jet flow is, and the quadratic relationship between the jet depth and the caliber of the burner 10 is formed. Experiments show that the spray distance in the horizontal direction is obviously increased along with the increase of the inclination angle of the nozzle in the range of 0-19 degrees, the spray inclination angle is continuously increased when the spray distance is the farthest at 19 degrees, the downward spray distance of the air flow is increased, but the horizontal distance is reduced, so that the spray angle is preferably 17-20 degrees.

When the production is carried out, the operating pressure of the gasification furnace is 4.0-8.0MPa, and the combustion temperature of the gasification furnace is 1400-1700 ℃.

In the coal gasification reaction, oxygen and carbon in the material react violently and emit a large amount of heat, the core area is heated to 1400-1700 ℃, the gasification intensity and the gasification efficiency are high at the temperature, and the water vapor decomposition amount can reach 90 percent at the temperature. As the high temperature gas flow continues to react with the carbon in the coal, the temperature is reduced, and the temperature in the main reaction zone where water gas is generated is about 1100 ℃.

The flow rate of the air supplied by the combustion system 20 affects the rate and stability of the high-temperature air flow. In order to form the gas flow into a jet flow in the middle of the cross section of the gasification furnace 40, the flow velocity of the center channel gas is set to 40 to 320m/s, preferably 60 to 100 m/s.

FIG. 7 is a schematic diagram of the control system 30 of the combustion system of the present invention, wherein the control system 30 includes an oxygen preheating control system 31 and a water vapor control system 32; the oxygen preheating control system 31 comprises a cold oxygen supply device 311, a cold oxygen cut-off valve 312, a cold oxygen regulating valve 313, an oxygen preheater 314, a first hot oxygen cut-off valve 315 and a second hot oxygen cut-off valve 316 which are sequentially connected in series, wherein a cold oxygen emptying valve 317 is arranged between the cold oxygen cut-off valve 312 and the cold oxygen regulating valve 313, and a hot oxygen emptying valve 318 is arranged between the oxygen preheater 314 and the first hot oxygen cut-off valve 315; the steam control system 32 comprises a steam supply device 321, a steam stop valve 322 and a steam regulating valve 323 which are connected in series in sequence, and a steam vent valve 324 is arranged between the steam stop valve 322 and the steam regulating valve 323.

wherein the air/oxygen-rich/oxygen required for combustion is fed through an oxygen preheat control system 31 and steam is fed through a steam control system 32, preferably the two gases are premixed in a tube before entering the burner 10.

The invention can continuously and stably supply air to the water-cooled wall type gasification furnace 40 through the combustion system 20, and avoids the problems of partial combustion, channeling and the like in the gasification furnace 40 by controlling all technical parameters of the combustion system 20.

on the other hand, as shown in fig. 1, the invention provides a jacketed double-layer cooling burner with outer sleeve protection, wherein the outer sleeve is a water-cooled wall coated with silicon carbide on the surface, and the double-layer cooling is respectively as follows: cooling water and nitrogen cooling.

Specifically, fig. 1 is a schematic view of an axial cross-sectional structure of a burner according to an embodiment of the present invention, where the burner 10 includes a cooling water jacket 11 and an outer sleeve 12, and the cooling water jacket 11 is an annular cavity-shaped structure and is disposed inside the outer sleeve 12; the first outer wall 111 of the cooling water jacket 11 forms a central channel 13 of the burner, and the second outer wall 112 of the cooling water jacket 11 and the inner wall of the outer sleeve 12 form a nitrogen channel 14.

wherein, the cooling water jacket 11 and the outer sleeve 12 are fixedly connected through a flange.

the outer sleeve 12 is composed of a water-cooled wall 121 and a silicon carbide layer 122, and the silicon carbide layer 122 can be attached to the outer side of the water-cooled wall 121 in a coating or pouring manner. The silicon carbide coating 122 has the advantages of high temperature resistance and wear resistance. In the gasification furnace for coal block high-temperature high-pressure gasification, the silicon carbide coating 122 can further protect the burner from high-temperature burning loss, and simultaneously avoid the wear of the burner caused by coal bed impact, so that the burner 10 can continuously and stably operate in the gasification furnace for coal block gasification at the temperature of 1400-1700 ℃ under the pressure of 4.0-8.0 MPa.

Wherein the thickness of the silicon carbide is 10-15mm, and preferably 13 mm.

As shown in fig. 1, the cooling water jacket 11 includes a first outer wall 111, a second outer wall 112, and a partition (not coded) between the first outer wall 111 and the second outer wall 112, the first outer wall 111 and the second outer wall 112 are connected or integrally formed, and both of them together form two sides of an annular cavity structure, the partition divides a space between the first outer wall 111 and the second outer wall 112 into two connected parts (i.e., an annular cavity), so as to form a water inlet channel and a water outlet channel of the cooling water jacket.

Wherein, cooling water circulates in the annular cavity, and the water outlet channel is communicated with the water inlet channel in the annular cavity.

The annular cooling water jacket 12 can directly extend into the head of the burner 10, so that the temperature of the head of the burner 10 is not too high through effective and rapid heat conduction, and the service life of the burner 10 is prolonged.

Preferably, the cooling water jacket 12 is provided at its head with at least one swirl plate (not shown). The swirl plate enables cooling water to form a vortex in the cooling water jacket 12, enhances the turbulence degree of the cooling water, enables the heat conductivity coefficient of the water to be not less than 0.685W/m.K, and avoids pressure rise caused by rapid evaporation of the cooling water in a high-temperature environment while uniformly cooling the head of the burner.

Optionally, the swirling plate may be a spherical structure or a straight plate structure. Preferably, the rotational flow plate adopts a spherical structure, and the rotational flow plate with the spherical structure can enable water flow in the cooling water jacket to uniformly flow, so that local damage caused by high temperature of the head of the burner is avoided.

wherein the central channel 13 of the burner is used for introducing a combination of water vapor and one or more of the following gases: air, oxygen-enriched air or oxygen. As shown in FIG. 6, during the production process, the high-speed gas flow ejected from the central channel 13 disturbs the material layer 401 at the lower part of the gasification furnace 40 to form a high-speed jet area 402 composed of gas, liquid and solid three phases.

Preferably, as shown in fig. 2-3, the central channel 13 is provided with at least one (preferably 8) air supply opening 132, and the air supply direction of the air supply opening 132 is inclined at 1-30 degrees with respect to the vertical direction of the axis of the central channel 13.

The air output by the air supply outlet 132 penetrates through the coal seam, and forms a rotational flow when the rotational flow reaches the center, and the area of the rotational flow is larger than 30% of the whole area. In addition, the present invention can adjust the main flow according to the angle of the air supply outlet 132, and can also set different air supply swirl angles according to the difference of the main flow.

Wherein, nitrogen is introduced into the gasification furnace 40 through the nitrogen gas passage 14. According to the invention, the nitrogen channel 14 is arranged on the outer side of the cooling water jacket 11, so that nitrogen can be premixed with air/oxygen-enriched/pure oxygen and steam sprayed out of the central channel 13 at an outlet, the air flow entering a coal bed is more uniform, and secondary cooling of the burner 10 can be realized by virtue of nitrogen with lower temperature.

Preferably, as shown in fig. 1, the burner 10 further includes a cooling water inlet (not coded), a cooling water outlet (not coded) for the cooling water jacket 11, a cooling water coil (not coded) and a nitrogen inlet (not coded) for the water wall 121, and an air/oxygen-rich/pure oxygen and steam mixed gas inlet (not coded). The positions of the cooling water inlet, the cooling water outlet, the nitrogen inlet and the mixed gas inlet, and the size, distribution density and other parameters of the cooling water coil pipe can be determined according to actual working conditions, and the invention is not particularly limited herein.

The structure and production process parameters of the combustion system and burner of the present invention are described in detail below by way of examples.

A burner 10 and a combustion system 20 for forcibly supplying air to a pressurized high-temperature coal bed are disclosed, wherein the combustion system 20 supplies air/oxygen-enriched/pure oxygen and steam required by lump coal combustion to a gasification furnace 40. Wherein, air/oxygen-enriched/pure oxygen and steam are sent into the gasification furnace 40 through the opposed burner 10, the installation angle of the opposed burner 10 and the furnace wall of the gasification furnace is 17-20 degrees, and the gas (or conversion) rate of the water steam is 92 percent. Air/oxygen-enriched/pure oxygen and steam enter the material layer 401 along a central channel 13 axially designed by the burner, 8 air supply openings 132 are arranged in the central channel 13, the rotational flow angle of the air supply openings 132 is 1-30 degrees, and air flows out of the burner 10 and reaches the material layer 401. The optimal rotational flow angle can be designed according to different air supply flow rates. The air/oxygen-enriched/pure oxygen and steam fed into the central channel 13 react with the coal bed and generate high-temperature airflow, the temperature of the reaction center reaches 1560 ℃, and the central temperature of 1560 ℃ and the pressure of the gasification furnace of 6.0MPa are the working environment of the burner 10.

in order to prolong the service life of the burner 10 in the working environment, the inventor arranges a cooling water jacket 11 at the axial outer side of a central channel 13 of the burner 10, a ring-shaped cavity in the jacket is filled with cooling water, and a water outlet channel is communicated with a water inlet channel in the ring-shaped cavity. The realization sets up the whirl board to the cooling by a wide margin of nozzle head and nozzle main part in the cooling water passageway to strengthen the cooling water torrent, increase the coefficient of heat transfer of cooling water, form the cooling water flow of equipartition on the one hand, avoid local high temperature, on the other hand whirl forms high temperature uniform velocity flow field in the high temperature zone, carries out uniform cooling to nozzle 10, avoids the rapid evaporation of cooling water and the pressure that causes simultaneously risees.

The nitrogen channel 14 is arranged on the outer side of the cooling water jacket 11, the nitrogen channel 14 is introduced into the gasification furnace 40, on one hand, the nitrogen channel 14 is premixed with the air/oxygen-rich/pure oxygen and steam of the central channel 13 at the outlet, so that the air flow entering the material layer 401 is more uniform, and on the other hand, the nitrogen channel 14 realizes secondary cooling of the burner 10 on the outer side of the cooling water.

The 13mm silicon carbide layer 122 is further arranged on the outer side of the nitrogen channel 14, namely the outermost layer of the burner 10, on one hand, the silicon carbide layer 122 is high-temperature resistant and wear resistant, on the other hand, the burner 10 can be further protected from high-temperature burning loss in the coal block high-temperature and high-pressure gasification gasifier 40, and meanwhile, the silicon carbide layer 122 is prevented from being worn when meeting coal bed impact, so that the continuous and stable operation of the combustion system 20 and the burner 10 at high strength and high temperature is ensured.

The present invention has been disclosed in the foregoing in terms of preferred embodiments, but it will be understood by those skilled in the art that these embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of the present invention. It should be noted that all changes and substitutions equivalent to those of the embodiments are intended to be included within the scope of the claims of the present invention. Therefore, the protection scope of the present invention should be subject to the scope defined in the claims.

Claims

1. A combustion system comprises a control system, a burner and a gasification furnace which are sequentially connected, and is characterized in that the burner comprises a cooling water jacket and an outer sleeve, wherein the cooling water jacket is of an annular cavity-shaped structure and is arranged inside the outer sleeve; the first outer wall of the cooling water jacket forms a central channel of the burner, and the second outer wall of the cooling water jacket and the inner wall of the outer sleeve form a nitrogen channel.

2. The combustion system as claimed in claim 1, wherein the central passage is provided with at least one air supply opening, and the air supply direction of the air supply opening is inclined at 1-30 ° to the vertical direction of the axis of the central passage.

3. The combustion system of claim 1, wherein the angle between the burner and the wall of the gasifier is between 17 ° and 20 °.

4. The combustion system of claim 1, wherein the outer jacket tube is comprised of a water cooled wall and a silicon carbide layer, the silicon carbide layer having a thickness of 10-15 mm.

5. The combustion system of claim 1, wherein the cooling water jacket includes a water inlet channel and a water outlet channel, the water inlet channel having a swirl plate disposed therein.

6. The combustion system of claim 1, wherein the burners are arranged in an opposed arrangement in the gasifier, and the number of burners is at least 4.

7. The combustion system of claim 1 wherein the control system includes an oxygen preheat control system and a water vapor control system;

The oxygen preheating control system comprises a cold oxygen supply device, a cold oxygen stop valve, a cold oxygen regulating valve, an oxygen preheater, a first hot oxygen stop valve and a second hot oxygen stop valve which are sequentially connected in series, wherein a cold oxygen blow-down valve is arranged between the cold oxygen stop valve and the cold oxygen regulating valve, and a hot oxygen blow-down valve is arranged between the oxygen preheater and the first hot oxygen stop valve;

The steam control system comprises a steam supply device, a steam stop valve and a steam regulating valve which are sequentially connected in series, wherein a steam vent valve is arranged between the steam stop valve and the steam regulating valve.

8. A burner is characterized by comprising a cooling water jacket and an outer sleeve, wherein the cooling water jacket is in an annular cavity structure and is arranged inside the outer sleeve; the first outer wall of the cooling water jacket forms a central channel of the burner, and the second outer wall of the cooling water jacket and the inner wall of the outer sleeve form a nitrogen channel.

9. The burner of claim 8, wherein the outer casing is comprised of a water wall and a silicon carbide layer, the silicon carbide layer having a thickness of 10-15 mm.

10. The burner of claim 8, wherein the cooling water jacket comprises a water inlet channel and a water outlet channel, and a swirl plate is disposed in the water inlet channel.

11. The burner nozzle of claim 8, wherein the central channel is provided with at least one air supply opening, and the air supply direction of the air supply opening is inclined by 1-30 degrees with the vertical direction of the axis of the central channel.