CN107339698B - Burner - Google Patents

Abstract

The utility model discloses a combustor, and belongs to the field of pulverized coal gasification. The front section integral ceramic prefabricated member comprises a front section combustion channel, a front section gasifying agent channel and a front section powder feeding channel which are in same ring, wherein the front section combustion channel comprises a flame stabilizing section of an hourglass-shaped inner cavity, the flame stabilizing section is communicated with the air channel, the front section powder feeding channel is communicated with the rear section powder feeding channel, the front section gasifying agent channel is communicated with the rear section gasifying agent channel, an outlet of the front section gasifying agent channel and an outlet of the flame stabilizing section are parallel to a central axis of the front section integral ceramic prefabricated member, and an outlet direction of the front section powder feeding channel is expanded and inclined towards one side of an outlet direction of the front section gasifying agent channel. The utility model solves the problems of difficult ignition and easy ignition of the burner and has the characteristics of high ignition success rate, good flame stability, high temperature resistance and wear resistance.

Description

a burner

technical field

The invention belongs to the field of pulverized coal gasification, and more specifically relates to a burner.

Background technique

The ignition burner of current gas generator usually adopts oil burner or gas burner. The flame is sprayed downwards into the gas generator to heat the gas generator. When the temperature in the gas generator reaches the requirement, it passes through the coal-feeding burner (the coal-feeding burner can be independent, or it can be combined with the ignition burner) The integrated composite burner) injects pulverized coal and gasification agent into the gasifier, and the gasifier starts to react. After the normal reaction and operation of the gas generator is stable, the ignition burner starts to stop injecting oil or gas. Although the ignition burner and ignition device can be made of heat-resistant steel and equipped with a water cooling device, they usually can only work normally below 450 ° C. Therefore, when the gas generator is working normally, the ignition burner needs to be drawn out of the gas generator, or add Other passages are protected by feeding other media to cool down the ignition burner to prevent the ignition burner from being ablated.

Based on the existing materials and the cooling method used, this type of ignition burner is directly inserted into the gas generator, which still faces difficulty in ignition, high probability of fire failure, poor high temperature resistance and wear resistance, and complicated ignition and powder feeding operations. , Difficulty in operation and maintenance, high risk, short burner life, high cost of use, etc.

First of all, since the temperature in the gas generator after normal reaction is in the range of 1200-1600°C, and the gasification agent swirl strength in the gas generator is very high, the end of the ignition burner receives large radiant heat and high temperature, in order to avoid For high-temperature radiation, it is necessary to arrange the ignition burner as far back as possible, but too far behind will result in insufficient combustion of the fuel ejected from the ignition burner; in addition, in general, in order to make the gasifier have an ideal gasification Reactive flow field, the length of the ignition burner extending into the gas generator must be long enough. In this case, the burner must bear higher temperature, thus causing the burner and ignition device to have a shorter life.

Secondly, since the ignition burner protrudes into the gas generator, the swirling flow in the gas generating furnace is relatively strong during operation, and the pulverized coal and gasification agent are easily caused by the burner to break off under the action of the swirling flow field. , the ignition burner often needs to be re-ignited many times in actual operation. In addition, the high-intensity swirling flow field in the gas generator will also cause greater wear and tear on the end of the burner. For the composite burner integrated with the burner, the coal feeding channel inside the burner is also severely eroded and worn.

Chinese invention patent, publication number: CN104974797B, publication date: July 11, 2017, discloses a multifunctional gasification burner for a two-stage dry coal pulverized entrained bed gasifier. The invention is characterized in that the head of a flame detection tube is placed in the center of the main burner, the outer layer of the flame detection tube is provided with a gas channel, and the head of the gas channel is provided with a gas nozzle; The outer layer of the channel is provided with a combustion-supporting air channel, and the head of the combustion-supporting air channel is provided with a swirl structure; the space formed between the head of the flame detection tube and the head of the main burner is a pre-combustion chamber; An ignition gun is arranged in the wind passage, and a flame detection device is arranged at the tail of the flame detection tube. This invention is designed according to the two-stage structure of the pre-gasification chamber and the main gasification furnace. The flame is injected into the furnace outside the burner, and the flame is mixed with the pulverized coal sprayed from the pulverized coal nozzle to burn in the furnace, but its disadvantages are: (1) The space of the pre-combustion chamber is large, and the combustion air When mixing with gas, the combustion-supporting air and gas are easy to diffuse, especially into the furnace, so the gathering and mixing effect of the combustion-supporting air and gas near the ignition gun is not ideal, which to a certain extent causes ignition difficulties; (2) Preliminary The flame rigidity formed is weak, and the pulverized coal that is introduced is easy to cause strong interference to the flame under the action of the rotating flow field, and it is easy to cause fire failure; It will also cause greater wear to the end of the burner.

Chinese Utility Model Patent, publication number: CN206033686U, publication date: August 22, 2016, discloses a pulverized coal gasification combined burner. It includes: a center tube, the inlet side of the center tube is provided with an ignition gas inlet, and the outside of the center tube is successively provided with an ignition air sleeve, a first cooling water sleeve, an oxidizer sleeve, a second cooling water sleeve, and pulverized coal Sleeve, the third cooling water jacket, the outlet of the ignition air jacket extends outward relative to the outlet of the central tube to define the first premixing zone for mixing ignition gas and ignition air; the outlet of the pulverized coal jacket is opposite to The outlet of the oxidizer casing extends outwards to define a second premixing zone for mixing the oxidant and coal powder; the diameter of the oxidizer casing near the outlet gradually becomes smaller, and the inner wall of the outlet of the oxidant casing along the circumference The swirl plate is arranged in the direction, and the utility model realizes the uniform gas-solid mixing of the oxidant and the coal powder, so that the combustion of the coal powder in the pulverized coal gasifier is stable and the carbon conversion rate is high. This utility model also exists in the same problem as the invention patent whose publication number is CN104974797B, that is, its disadvantages are: (1) the ignition gas and ignition air are very easy to spread outwards, so the ignition gas and ignition air gather near the ignition device The effect of mixing is not ideal, therefore, there is also the problem of difficulty in ignition; (2) the first premixing zone is easily disturbed by the outside world, and the pulverized coal is likely to cause strong interference to the initially formed flame under the action of the rotating flow field, which is very difficult It is easy to cause fire breakage. In addition, during the application of this utility model, the flame must pass through the first premixing zone to heat the pulverized coal for gasification. Therefore, the first premixing zone not only protects the flame from being disturbed, but also prolongs the length that the flame must pass through. The rigidity of the flame is therefore reduced, thereby reducing the effect of the pulverized coal gasification reaction in the furnace.

Chinese utility model patent, publication number: CN206109325U, publication date: April 19, 2017, discloses a pulverized coal gasification combined burner. It includes: a central tube, an ignition gas inlet is arranged on the side wall of the central tube near the entrance; the outer part of the central tube is sequentially provided with an ignition air sleeve, a gasification agent sleeve, a pulverized coal sleeve and a cooling water sleeve; gasification The outlet of the agent casing, the outlet of the pulverized coal casing, and the outlet of the cooling water casing extend outward in sequence relative to the outlet of the center pipe to define a premixing area for the preliminary mixing of gasification agent and pulverized coal; , the premixing zone is a conical space with gradually increasing cross-sectional area. The pulverized coal gasification combined burner of the utility model realizes the uniform gas-solid mixing of gasification agent and coal powder, so that the combustion of coal powder in the gasifier is stable and the carbon conversion rate is high. Its shortcomings are: (1) the above-mentioned difficulty in ignition also exists; (2) the swirling flow in the premixing zone is strong, and after the gasification agent and coal powder are introduced, it is easy to cause the burner to break off, so in the The pulverized coal gasification process requires multiple re-ignitions.

Chinese utility model patent, publication number: CN204607936U, publication date: September 2, 2015, discloses a long-life coal gasification process burner. It is composed of coal powder spray gun, combustion-supporting gas spray gun, steam spray gun and burner front face. The combustion-supporting gas spray gun is set outside the coal powder spray gun and connected with the combined flange of the coal powder spray gun. Outside the gas spray gun, it is connected with the combined flange of the combustion-supporting gas spray gun. The front end of the barrel of the steam spray gun is connected with the steam burner cover through fasteners. The front end of the steam burner cover is provided with a heat radiation shielding plate to form the front face of the burner. The pulverized coal channel, burner cover and burner front face are all made of ceramic materials, and the entire burner is separated from the high-temperature radiation in the furnace by a lightweight refractory module, canceling the cooling system of the traditional burner, and effectively solving the process The problems of high temperature corrosion, fatigue cracking and erosion wear of the burner can meet the requirements of industrial applications with full load and long-term operation for more than one year. The utility model is suitable for partial combustion gasification processes such as pulverized coal gasification or coal-water slurry gasification. Its disadvantages are: (1) The combustion-supporting gas burner sleeve and the semi-Laval type swirl guide constitute the combustion-supporting gas cyclone outlet. (2) The gas passing through the gas pipe and the combustion-supporting gas sprayed from the combustion-supporting gas spray gun are mixed and ignited to form a flame at a higher temperature. Since there is no cooling effect of the cooling system, the gas pipeline (3) the pulverized coal jet flow through the ceramic pulverized coal nozzle interferes with the flame ejected from the outlet of the annular gas passage, which may easily cause ignition difficulties and fire failure.

Contents of the invention

1. Problems to be solved

Aiming at the problems of difficult ignition and easy flame failure in the existing ignition burner, the invention provides a burner which has the characteristics of high ignition success rate, good flame stability, excellent wear resistance and high temperature resistance.

2. Technical solution

In order to solve the above problems, the present invention adopts the following technical solutions.

A burner, comprising a rear steel assembly and a front integral ceramic prefabricated part, the front integral ceramic prefabricated part is fixedly arranged at the front end of the rear steel assembly;

The rear section steel components include:

A gas casing, the gas casing has a gas channel;

An air sleeve, the air sleeve is sleeved on the outside of the gas sleeve, and an air channel is defined between the inner wall of the air sleeve and the outer wall of the gas sleeve;

A pulverized coal casing, the pulverized coal casing is sleeved outside the air casing, and a rear powder feeding channel is defined between the inner wall of the pulverized coal casing and the outer wall of the air casing;

Gasification agent casing, the gasification agent casing is sleeved on the outside of the pulverized coal casing, and the rear-stage gasification is defined between the inner wall of the gasification agent casing and the outer wall of the pulverized coal casing. chemical channel;

An ignition electrode rod is also arranged between the inner wall of the air sleeve and the outer wall of the gas sleeve, and the front end of the ignition electrode rod is flush with the outlet end of the gas sleeve;

The front integral ceramic prefabricated part is a structure including a conical surface, which also includes three channels in the same ring, and the outlets of the three channels in the same ring intersect with the conical surface;

The three channels in the same ring are respectively the front combustion channel located in the center of the front integral ceramic preform, the front gasification agent channel on the outside, and the front powder feeding channel between the front combustion channel and the front gasification agent channel. The front section of the combustion passage includes a sealing installation section and a flame stabilization section, the inner diameter of the sealing installation section matches and is fixedly connected with the outer diameter of the air sleeve, the inner cavity of the flame stabilization section is hourglass-shaped, and is connected to the The air channel is connected, the powder feeding channel in the front section is in communication with the powder feeding channel in the rear section, and the gasification agent channel in the front section is connected with the gasification agent channel in the rear section;

The outlet of the gasification agent channel in the front section and the outlet of the flame stabilization section are all parallel to the central axis of the integral ceramic preform in the front section;

The outlet direction of the front-stage powder feeding channel expands and slopes toward one side of the outlet direction of the front-stage gasifying agent channel.

Further, the inner diameter of the outlet end of the flame stabilization section is equal to the inner diameter of the air sleeve.

Further, the gasification agent channel in the front stage is a structure that shrinks first and then expands from the inlet to the outlet.

Further, the steel component of the rear section also includes an inner water-cooled jacket and an outer water-cooled jacket, the inner water-cooled jacket is sleeved on the outer wall of the pulverized coal casing, and the outer water-cooled jacket covers It is arranged on the outer wall of the gasifying agent casing.

Further, a helical-toothed air distribution orifice is provided at one end of the air sleeve close to the flame-stabilizing section; the helical-toothed air distribution orifice is cylindrical, and its outer diameter is the same as that of the air sleeve. The inner diameter of the helical air distribution orifice plate is provided with a central hole, a number of straight ventilation holes, side holes and a number of oblique ventilation holes in sequence from its center to the outer periphery, and the inner diameter of the central hole is the same as that of the gas sleeve. The outer diameter of the tube is matched, the inner diameter of the side hole is matched with the outer diameter of the ignition electrode rod, and several oblique ventilation holes are inclined in the same direction relative to the axis of the helical toothed air distribution orifice plate. .

Further, a gasification agent swirl member is provided along the circumference in the gasification agent passage in the latter stage, and the gasification agent swirl member includes a central shaft and swirl vanes surrounding the central shaft , the swirl blades are inclined in the same direction relative to the central axis.

Further, the inner water-cooling jacket includes a first inner water-cooling channel and a second inner water-cooling channel, the first inner water-cooling channel and the second inner water-cooling channel are prefabricated close to the front section integral ceramic One end of the piece is connected; the outer water-cooling jacket includes a first outer layer water-cooling channel and a second outer layer water-cooling channel, and the first outer layer water-cooling channel and the second outer layer water-cooling channel are close to the front section One end of the ceramic preform is connected.

Further, the end surface of the outer wall of the gasification agent channel in the front section is fixedly connected with the end surface of the gasification agent sleeve, and the end surface of the outer wall of the powder feeding channel in the front section is integrated with the inner water-cooling jacket close to the front section. One end face of the ceramic preform is correspondingly connected.

Further, a refractory flexible filler is provided at the joint between the front integral ceramic prefabricated part and the rear steel component.

Further, a refractory ceramic fiber felt is arranged between the end surface of the outer wall of the front powder feeding channel and the end surface of the inner water-cooled jacket, and between the sealing installation section and the outer wall of the air sleeve, the Refractory ceramic fiber twisted ropes are arranged between the inner wall of the outer water-cooling jacket and the outer wall of the gasifying agent passage in the preceding stage. .

3. Beneficial effects

Compared with the prior art, the beneficial effects of the present invention are:

(1) In the burner provided by the present invention, the sealing performance is enhanced by enclosing the air sleeve with the front integral ceramic prefabricated part, and the inner chamber connected with the air channel is an hourglass-shaped flame-stabilizing section, which on the one hand promotes the combustion of gas and air. It gathers and mixes near the front end of the ignition electrode rod, so it is easier to ignite. On the other hand, it also ensures that the coal powder and gasification agent will not interfere with the initial flame during the coal feeding process, avoiding fire failure;

(2) In the burner provided by the present invention, the integral ceramic prefabricated part in the front section has excellent wear resistance and high temperature resistance, which effectively solves the problem of high temperature and high swirling flow intensity of the existing burner burner in the gas generator. Erosion wear and high temperature fatigue cracking are prone to occur in the field; in addition, the hourglass-shaped flame stabilization section forms a wrapping protection for the ignition electrode rod, which helps to reduce the impact of high temperature radiation and erosion wear;

(3) In the burner provided by the present invention, the powder feeding channel in the front section has a flaring structure design that expands and inclines to one side of the outlet direction of the gasification agent channel in the front section, and the pulverized coal passing through the powder feeding channel in the front section forms an outwardly diffused conical flow field, and form a cross flow with the gasification agent passing through the gasification agent channel in the front stage, which improves the mixing and atomization effect of pulverized coal and gasification agent to a certain extent;

(4) In the burner provided by the present invention, the inner diameter of the outlet end of the hourglass-shaped inner cavity of the flame-stabilizing section is equal to the inner diameter of the air sleeve, which ensures that the ejected flame has a higher rigidity, so it is not easy to be burned by coal powder. Blow out with gasification agent, etc.;

(5) In the burner provided by the present invention, the gasification agent channel in the front stage shrinks first and then expands from the inlet to the outlet structure, which increases the injection speed of the gasification agent and helps the mixing and atomization of the gasification agent and pulverized coal;

(6) In the burner provided by the present invention, the water-cooled jacket provided on the outer wall of the pulverized coal casing and the outer wall of the gasification agent casing enhances the cooling effect and avoids high-temperature fatigue cracking of the casing;

(7) In the burner provided by the present invention, the helical air distribution orifice plate ensures uniform distribution of combustion-supporting air, and forms a swirling flow field, which enhances the mixing effect of combustion-supporting air and gas, thereby improving the ignition success rate and flame stiffness of the burner ;

(8) In the burner provided by the present invention, the gasification agent swirl member makes a columnar swirl flow field formed in the gasification agent channel in the front section, improving the mixing and atomization effect of the gasification agent and pulverized coal;

(9) In the burner provided by the present invention, on the one hand, the refractory flexible filler acts as a seal to seal and isolate each channel, avoiding hidden dangers such as combustion in the tube caused by the inter-channel inter-channel media, and on the other hand, as a flexible compensation element, to compensate for the overall ceramic prefabrication of the front section. The expansion difference between the component and the steel component of the subsequent section.

Description of drawings

Fig. 1 is a schematic sectional view of the present invention;

Fig. 2 is a structural schematic diagram of a helical air distribution orifice;

Fig. 3 is a schematic structural diagram of a gasifying agent swirl member.

In the figure: 1. Gas sleeve; 2. Ignition electrode rod; 3. Air sleeve; 4. Inner water-cooled jacket; 5. Gasification agent swirl; 6. Outer water-cooled jacket; 7. Refractory ceramics Fiber felt; 8. Refractory ceramic fiber twisted rope; 9. Ceramic prefabricated parts in the front section; 10. Helical tooth cloth air hole plate; 11. Combustion channel in the front section; 12. Powder feeding channel in the front section; 13. Gasification agent channel in the front section; 14 1. Pulverized coal casing; 15. Gasification agent casing; 16. Sealing installation section; 17. Flame stabilization section.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

Example 1

As shown in Figure 1, a burner includes a rear steel component and a front integral ceramic prefabricated part 9, and the front integral ceramic prefabricated part 9 is fixedly arranged at the front end of the rear steel component;

The rear section steel components include:

A gas casing 1, the gas casing 1 has a gas channel;

An air sleeve 3, the air sleeve 3 is sleeved on the outside of the gas sleeve 1, and an air channel is defined between the inner wall of the air sleeve 3 and the outer wall of the gas sleeve 1;

Pulverized coal casing 14, the pulverized coal casing 14 is sleeved on the outside of the air casing 3, and the rear section of the casting is defined between the inner wall of the pulverized coal casing 14 and the outer wall of the air casing 3. powder channel;

Gasification agent casing 15, the gasification agent casing 15 is sleeved on the outside of the pulverized coal casing 14, between the inner wall of the gasification agent casing 15 and the outer wall of the pulverized coal casing 14 Defining the gasifying agent channel in the latter stage;

An ignition electrode rod 2 is also arranged between the inner wall of the air sleeve 3 and the outer wall of the gas sleeve 1, and the front end of the ignition electrode rod 2 is flush with the outlet end of the gas sleeve 1;

The front integral ceramic preform 9 is a structure including a conical surface, which also includes three channels in the same ring, and the outlets of the three channels in the same ring intersect with the conical surface;

The three passages in the same ring are respectively the front combustion passage 11 located in the center of the front integral ceramic preform 9, the front gasification agent passage 13 on the outside, and the front injection channel between the front combustion passage 11 and the front gasification agent passage 13. Powder channel 12, the front powder feeding channel 12 communicates with the rear powder feeding channel, and the front gasifying agent channel 13 communicates with the rear gasifying agent channel;

The front combustion channel 11 includes a sealing installation section 16 and a flame-stabilizing section 17, the inner diameter of the sealing installation section 16 is fixedly connected with the outer diameter of the air sleeve 3, and the flame-stabilizing section 17 is hourglass-shaped , and communicate with the air channel;

Both the outlet of the gasifying agent channel 13 in the front section and the outlet of the flame stabilization section 17 are parallel to the central axis of the integral ceramic preform 9 in the front section;

The outlet direction of the front powder feeding channel 12 expands and slopes towards one side of the outlet direction of the front gasification agent channel 13 .

The burner in this embodiment adopts a two-stage structural design of the front integral ceramic prefabricated part 9 and the rear steel component. The front integral ceramic prefabricated part 9 has excellent wear resistance and high temperature resistance, effectively solving the existing The burner burner is prone to erosion wear and high temperature fatigue cracking in the high temperature and high swirl strength flow field in the gas generator, which effectively prolongs the life of the burner and reduces the use cost of the burner. When the burner is working, the combustion-supporting air is first introduced, and then the ignition electrode rod 2 is started to ignite and the gas is introduced. At this time, a preliminary combustion flame is formed in the front combustion channel 11, and the flame-stabilizing section 17 of the hourglass-shaped inner cavity structure is in this process. There are two functions: first, when gas and combustion air are introduced, due to the shrinkage of the internal space of the flame stabilization section 17, the gas and combustion air will gather in the space between the outlet of the gas sleeve 1 and the flame stabilization section 17 It is not easy to continue to diffuse outwards, so it is easy to ignite and has a high ignition success rate; secondly, the shrinkage of the internal space of the flame stabilization section 17 reduces to a certain extent the impact of pulverized coal and gasification agent on the ignition process and preliminary The impact of the flame formed by combustion effectively avoids the fire break. The sealing installation section 16 wraps and fixes the air sleeve 3 in a manner that enhances the sealing performance and prevents coal dust and other cut-offs from penetrating into the front section of the combustion channel 11, causing potential safety hazards.

In addition, the front powder feeding channel 12 has a flaring structure designed to expand and incline to one side of the outlet direction of the front gasification agent channel 13. The gasification agent in the gasification agent channel 13 in the front stage forms a cross flow, which improves the mixing and atomization effect of pulverized coal and gasification agent to a certain extent, and promotes the gasification efficiency of pulverized coal. On the other hand, this structure makes the spraying direction of the pulverized coal bypass the flame, avoiding direct impact on the flame and causing flame failure, so the burner in this embodiment has good flame stability.

Example 2

As shown in Figure 1, a kind of burner, its structure is compared with embodiment 1, the difference is: the inner surface of described flame holding section 17 transitions smoothly, and the inner diameter of its outlet end is the same as that of the air sleeve 3 The inner diameters of the cylinders are equal, which ensures that the jetted flame has a high rigidity and is not easily blown out by coal powder and gasification agent.

Example 3

As shown in Figure 1, a kind of burner, its structure is compared with embodiment 1, and the difference is: the gasification agent channel 13 of the front stage is the structure that shrinks first and then expands from the inlet to the outlet, increasing the gasification agent The injection speed promotes the mixing and atomization of gasification agent and coal powder.

Example 4

As shown in Figure 1, a kind of burner, its structure is compared with embodiment 1, and difference is: described rear section steel component also comprises inner layer water-cooled jacket 4 and outer layer water-cooled jacket 6, so The inner water-cooling jacket 4 is sleeved on the outer wall of the pulverized coal casing 14 , and the outer water-cooling jacket 6 is sleeved on the outer wall of the gasification agent casing 15 .

In this embodiment, the outer wall of the pulverized coal casing 14 and the outer wall of the gasification agent casing 15 are respectively provided with an inner water-cooled jacket 4 and an outer water-cooled jacket 6, and the inlet and outlet of the cooling water are arranged at the center of the air jacket 3. Both sides of the symmetry axis are located at the end away from the integral ceramic prefabricated part 9 in the front section. This structure enhances the cooling effect on the steel components in the rear section, alleviates the thermal fatigue damage of the steel components in the rear section due to high temperature radiation, and achieves protection. the goal of.

Example 5

As shown in Figures 1 and 2, a burner whose structure is compared with that of Embodiment 1 is different in that: the end of the air sleeve 3 close to the flame-stabilizing section 17 is provided with helical teeth shaped air distribution orifice 10; the helical air distribution orifice 10 is cylindrical, and its outer diameter matches the inner diameter of the air sleeve 3; the helical air distribution orifice 10 is formed by its center A central hole, several straight ventilation holes, side holes and several oblique ventilation holes are sequentially arranged on the outer periphery, the inner diameter of the central hole matches the outer diameter of the gas casing 1, and the inner diameter of the side hole matches the ignition The outer diameters of the electrode rods 2 match, and the several oblique ventilation holes are inclined in the same direction relative to the axis of the helical-toothed air distribution orifice plate 10 .

The helical air distribution orifice plate 10 has the functions of swirl and air distribution, which ensures that the combustion air is evenly distributed and forms a swirl flow field, thereby promoting the passage of combustion air and gas between the outlet of the gas casing 1 and the flame stabilization section 17 Internal aggregation mixing, which to a certain extent helps to improve the success rate of burner ignition and the stiffness of the burner flame, thereby ensuring the stability of the combustion flame.

Example 6

As shown in Figure 1 and Figure 3, the structure of a burner is compared with that of Embodiment 4, the difference is: in the gasification agent channel of the latter stage, a gasification agent swirl piece is arranged along the circumferential direction 5. The gasification agent swirl member 5 is composed of a central shaft and swirl vanes surrounding the central shaft. The swirl vanes are inclined in the same direction relative to the central shaft, and the gasification agent swirls The piece 5 makes a columnar swirl flow field be formed in the gasification agent channel 13 at the front stage, and improves the mixing and atomization effect of the gasification agent and coal powder.

Example 7

As shown in Figure 1, a kind of burner, its structure is compared with embodiment 4, the difference is: described inner layer water cooling jacket 4 comprises first inner layer water cooling channel and second inner layer water cooling channel, described The first inner layer water-cooling channel and the second inner layer water-cooling channel communicate at one end close to the front integral ceramic preform 9; the outer layer water-cooling jacket 6 includes the first outer layer water-cooling channel and the second outer layer water-cooling channel channels, the first outer layer water cooling channel and the second outer layer water cooling channel communicate at one end close to the front integral ceramic preform 9 .

The inner water-cooled jacket 4 and the outer water-cooled jacket 6 provided in this embodiment all have a two-layer structure, and the inlet and outlet of the cooling water in the inner water-cooled jacket 4 are respectively arranged in the first inner water-cooled channel and the second inner water-cooled channel. The end of the inner water cooling channel away from the front integral ceramic preform 9, the inlet and outlet of the cooling water in the outer water cooling jacket 6 are respectively set on the first outer water cooling channel and the second outer water cooling channel away from the front integral ceramic prefabrication At one end of piece 9, the cooling water circulates around the rear steel components, absorbing most of the heat transferred to the rear steel components during the burner operation, and improving the service life of the rear steel components.

Example 8

As shown in Fig. 1, Fig. 2 and Fig. 3, a kind of burner, its structure is compared with embodiment 7, the difference is: the end face of the outer wall of the gasification agent channel 13 in the front section and the gasification agent sleeve 15 is fixedly connected to one end surface close to the front integral ceramic preform 9 , and the end surface of the outer wall of the front powder feeding channel 12 is fixedly connected to the end surface of the inner water-cooling jacket 4 . In specific applications, in order to increase the sealing of the connection between the front integral ceramic prefabricated part 9 and the rear steel component, a Refractory flexible fillers are provided at the joints. For example, in this embodiment, a refractory ceramic fiber felt 7 is provided between the end surface of the outer wall of the front powder feeding channel 12 and the end surface of the inner water-cooled jacket 4. Refractory ceramic fiber twisted ropes 8 are arranged between the sealing installation section and the outer wall of the air sleeve 3 , and between the inner wall of the outer water-cooled jacket 6 and the outer wall of the gasifying agent channel 13 in the front section.

On the one hand, the refractory flexible filler in this embodiment acts as a seal to avoid hidden dangers such as combustion in the tube caused by the inter-channel media crossing, and also ensures the safety during ignition, temperature rise and powder feeding. On the other hand, it acts as a flexible compensation The component plays the role of compensating the expansion difference between the integral ceramic prefabricated part 9 in the front section and the steel component in the back section.

In this embodiment, the integral ceramic prefabricated part 9 in the front section and the steel assembly in the rear section are assembled through a shoulder, and an assembly gap is left, and the steel assembly in the rear section of the burner is connected by a flange, which can realize non-destructive disassembly and mechanical assembly step by step. Compared with ordinary steel welded burners, half-steel and half-ceramic burners greatly reduce the number of welds, thereby improving the reliability of the burner structure, and at the same time greatly reducing the difficulty of replacing vulnerable parts and saving costs;

The above content is a further detailed description of the present invention in conjunction with specific embodiments. It cannot be determined that the specific implementation of the present invention is limited to these descriptions. For those of ordinary skill in the technical field of the present invention, without departing from the concept of the present invention. Several simple inferences or substitutions can also be made, all of which should be deemed to belong to the protection scope determined by the submitted claims of the present invention.

Claims (10)

1. A burner, comprising a back section steel assembly, said back section steel assembly comprising: A gas casing (1), the gas casing (1) having a gas passage; An air sleeve (3), the air sleeve (3) is sleeved on the outside of the gas sleeve (1), the inner wall of the air sleeve (3) and the outer wall of the gas sleeve (1) define an air passage between them; Pulverized coal casing (14), the pulverized coal casing (14) is sleeved on the outside of the air casing (3), and the inner wall of the pulverized coal casing (14) is connected to the air casing (3) ) between the outer walls to define the rear segment of the powder channel; Gasification agent sleeve (15), the gasification agent sleeve (15) is sleeved on the outside of the pulverized coal sleeve (14), the inner wall of the gasification agent sleeve (15) is in contact with the coal The gasification agent channel in the rear stage is defined between the outer walls of the powder casing (14); An ignition electrode rod (2) is also arranged between the inner wall of the air sleeve (3) and the outer wall of the gas sleeve (1), and the front end of the ignition electrode rod (2) is connected to the gas sleeve ( 1) The outlet ends are flush; It is characterized in that it includes a front integral ceramic prefabricated part (9), and said front integral ceramic prefabricated part (9) is fixedly arranged at the front end of said rear steel component; The front integral ceramic prefabricated part (9) is a structure including a conical surface, and it also includes three channels in the same ring, and the outlets of the three channels in the same ring intersect with the conical surface; The three channels in the same ring are respectively the front combustion channel (11) located in the center of the front integral ceramic preform (9), the front gasification agent channel (13) on the outside, and the front combustion channel (11) and the front gasification channel. The front section powder feeding channel (12) between the agent channels (13), the front section combustion channel (11) includes a sealing installation section (16) and a flame stabilizing section (17), and the inner diameter of the sealing installation section (16) is the same as The outer diameter of the air sleeve (3) is matched and fixedly connected, the inner cavity of the flame stabilization section (17) is hourglass-shaped, and communicates with the air passage, and the powder feeding passage (12) in the front section is connected with the air passage. The rear-stage powder feeding channel is communicated, and the front-stage gasification agent channel (13) is communicated with the rear-stage gasification agent channel; The outlet of the gasification agent channel (13) in the front section and the outlet of the flame stabilization section (17) are all parallel to the central axis of the integral ceramic preform (9) in the front section; The outlet direction of the front-stage powder feeding channel (12) expands and slopes toward one side of the outlet direction of the front-stage gasification agent channel (13). 2. The burner according to claim 1, characterized in that: the inner diameter of the outlet end of the flame stabilization section (17) is equal to the inner diameter of the air sleeve (3). 3. The burner according to claim 1, characterized in that: the gasifying agent channel (13) in the front stage is a structure that shrinks first and then expands from the inlet to the outlet. 4. The burner according to claim 1, characterized in that: the rear steel assembly also includes an inner water-cooled jacket (4) and an outer water-cooled jacket (6), and the inner water-cooled jacket The sleeve (4) is sleeved on the outer wall of the pulverized coal sleeve (14), and the outer water-cooled jacket (6) is sleeved on the outer wall of the gasification agent sleeve (15). 5. The burner according to claim 1, characterized in that: one end of the air sleeve (3) close to the flame stabilization section (17) is provided with a helical air distribution orifice (10) , the helical air distribution orifice (10) is cylindrical, and its outer diameter matches the inner diameter of the air sleeve (3); the helical air distribution orifice (10) is formed by its center A central hole, a number of straight ventilation holes, side holes and a number of oblique ventilation holes are sequentially arranged on the outer periphery, the inner diameter of the central hole matches the outer diameter of the gas casing (1), the inner diameter of the side hole matches the outer diameter of the The outer diameter of the ignition electrode rod (2) is matched, and the several oblique ventilation holes are inclined in the same direction relative to the axis of the helical-toothed air distribution hole plate (10). 6. The burner according to claim 1 or 4, characterized in that: a gasification agent swirl piece (5) is provided along the circumferential direction in the gasification agent passage in the rear stage, and the gasification agent swirl The flow element (5) is composed of a central shaft and swirl vanes surrounding the central shaft, and the swirl vanes are inclined in the same direction relative to the central shaft. 7. The burner according to claim 4, characterized in that: the inner water-cooling jacket (4) comprises a first inner water-cooling channel and a second inner water-cooling channel, the first inner water-cooling channel and the second inner water-cooling channel The second inner layer water-cooling channel communicates with one end close to the front integral ceramic preform (9); the outer layer water-cooling jacket (6) includes a first outer layer water-cooling channel and a second outer layer water-cooling channel, so The first outer-layer water-cooling channel communicates with the second outer-layer water-cooling channel at one end close to the front-end monolithic ceramic preform (9). 8. The burner according to claim 7, characterized in that: the end surface of the outer wall of the gasification agent channel (13) in the front section is fixedly connected with the end surface of the gasification agent sleeve (15), and the powder feeding in the front section The end surface of the outer wall of the channel (12) is correspondingly connected with the end surface of the inner water-cooling jacket (4) close to the front integral ceramic prefabricated part (9). 9. The burner according to claim 8, characterized in that a refractory flexible filler is provided at the joint between the front integral ceramic prefabricated part (9) and the rear steel component. 10. The burner according to claim 9, characterized in that: a refractory ceramic fiber felt is arranged between the end face of the outer wall of the front powder feeding channel (12) and the end face of the inner water-cooling jacket (4) (7), between the sealing installation section and the outer wall of the air sleeve (3), between the inner wall of the outer water-cooled jacket (6) and the outer wall of the gasification agent passage (13) in the front stage , are all provided with refractory ceramic fiber twisted rope (8).

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