CN212805616U

CN212805616U - Cyclone burner using high-temperature raw gas

Info

Publication number: CN212805616U
Application number: CN202021150647.XU
Authority: CN
Inventors: 孙锐; 刑春礼; 闫永宏; 朱文堃
Original assignee: Harbin Institute of Technology
Current assignee: Harbin Institute of Technology
Priority date: 2020-06-19
Filing date: 2020-06-19
Publication date: 2021-03-26
Anticipated expiration: 2030-06-19

Abstract

A cyclone burner using high-temperature raw gas belongs to the technical field of high-efficiency clean coal combustion. The problem of low NOx combustor does not be applicable to the high-efficient low NOx cyclone of raw coke oven gas among the prior art and because do not have a high-efficient low NOx raw coke oven gas cyclone in the prior art, make it can't dispose the raw coke oven gas cyclone for segmentation coupling pulverized coal combustion technology is solved. The device mainly comprises a central tube, an inner peripheral air channel, a raw gas channel, an outer peripheral air channel, a water-cooling coil cooling system and a diffusion small flame generator; the method is characterized in that the raw gas is combusted based on the comprehensive cooling technologies of raw gas diffusion small flame, weak swirl vortex outer boundary layer ignition stable combustion, rich fuel combustion, air classification, water cooling and air cooling; the utility model has the characteristics of absolutely catch fire surely, restrain fuel type and heating power type NOx and take place, high-efficient, prevent slagging scorification and high temperature corrosion, load response is good, the cooling is reliable, be applicable to the segmentation coupling buggy burning of extensive coal type.

Description

Cyclone burner using high-temperature raw gas

Technical Field

The utility model belongs to the technical field of high-efficient clean coal burning.

Background

With the continuous increase of GDP in China, the energy demand is also continuously increased. In the existing primary energy composition of China, the proportion of coal still reaches more than 70 percent, and the proportion of the coal in the primary energy consumption is estimated to exceed 50 percent by 2030 years, and the consumption reaches about 45 hundred million tons. The average comprehensive utilization efficiency of power generation and heat supply in China is only about 40 percent, which is 10 percent lower than that of developed countries, and the NOx discharged by coal accounts for 75 percent. In the mined coal reserves explored in China, the low-quality coal reaches about 50%, the proportion of only anthracite and lean coal approaches 30%, and a large amount of coke produced by lignite upgrading or low-temperature pyrolysis also needs a novel combustion and gasification technology to be cleanly and efficiently utilized; the thermal power generated by direct combustion of coal accounts for more than 70% of the total power generation amount of China, and the coal provides 80% of thermal power fuel, wherein the majority of thermal power plants use inferior coal; in addition, the coal quality of the Chinese power coal is unstable and often cannot meet the design coal standard. Chinese thermal power recent target: when the average power supply standard coal consumption is reduced to 315 g/kilowatt, the S02 emission concentration is controlled to be 50mg/Nm3, and the NOX emission concentration is controlled to be 100mg/Nm3, which is the internal power of the research and development of the novel coal burning technology in China.

Although various coal burning technologies are developed at home and abroad, the coal burning technologies are shown in the burning of difficult-to-burn fuels such as low-volatile anthracite, lean coal, coke and the like, and because the efficient and clean physicochemical conditions are often mutually restricted, the development of the coal burning technologies which simultaneously realize stable burning, high efficiency, low NOx, slagging resistance, high-temperature corrosion, fast load response and excellent low-load performance still faces challenges.

Aiming at the combustion of fuels such as hard-burning low-volatile anthracite, lean coal, coke and the like, the prior art provides a sectional coupling pulverized coal combustion device and a method, the theoretical design of pyrolysis, combustion, crushing, gasification, desulfurization, particle sorting, carbon conversion and burnout is pertinently implemented based on different stages of coal combustion thermochemical conversion, the structural design of effective coupling of quality, momentum and energy of each stage is implemented by utilizing a new structure in a furnace, the low-temperature pyrolysis section of an optimized double-vortex fast fluidized bed and the high-temperature carbon conversion section of a pulverized coal furnace are combined, the mutual restriction of physicochemical conditions of high-efficiency clean coal combustion is broken through the independent control of each section, the advantages of each section are exerted, and the disadvantages of each section are overcome, so that the pulverized coal combustion with stable ignition, high efficiency, low NOx, slag and corrosion resistance, fast load response and excellent low load performance of coal, especially hard-burning inferior coal, can be simultaneously realized, and the coal type adaptability of the combustion equipment is expanded. However, in the sectional coupling pulverized coal combustion technology, a high-performance raw coke oven gas cyclone/direct-current burner must be configured for a pulverized coal furnace which performs carbon conversion and burns out in a high-temperature carbon conversion section so as to effectively couple and burn raw coke oven gas generated by a low-temperature section double-vortex fast fluidized bed, so that sectional coupling pulverized coal combustion can be realized, and efficient and clean pulverized coal combustion of a wide range of coal types can be realized.

Specifically, a sectionally-coupled pulverized coal combustion process is implemented in two sections, and in a low-temperature section below 980 ℃, coal with the particle size of less than 10mm, particularly nonflammable coal particles are independently dried, pyrolyzed, combusted, crushed, gasified, desulfurized and particle-sorted by using an optimized double-vortex fast fluidized bed through centrifugal fluidization, so that fuel is reformed into raw coke gas, and the raw coke gas is a gas-solid two-phase flow which is generated by the optimized double-vortex fast fluidized bed in the low-temperature section, has the pressure of less than 3MPa, the temperature of 500 ℃ to 980 ℃, and only contains semicoke and coke particles with the particle size of less than 70 mu m in combustible gas; in the high-temperature section of more than 980 ℃, a rotational flow/direct current raw gas burner is needed to be configured in the pulverized coal furnace, so that the raw gas is independently and efficiently and cleanly combusted in the pulverized coal furnace, and the pulverized coal combustion with wide coal types, particularly difficult-to-fire coal, stable combustion, high efficiency, low NOx, slagging resistance, high-temperature corrosion resistance, fast load response and excellent low-load performance can be simultaneously realized in the sectional coupling pulverized coal combustion process.

However, in the prior art, a corresponding raw coke oven gas cyclone burner is not equipped in the sectional coupling pulverized coal combustion technology so as to realize high-efficiency low-NOx cyclone combustion of a high-temperature carbon conversion section; in the prior art, although a micro-injection weak-rotation low-NOx efficient hydrogen cyclone burner and an absolute ignition stable-combustion large-air excess coefficient low-NOx oil cyclone burner are disclosed, the burners are not suitable for the raw gas combustion, and a pulverized coal combustion cyclone burner is also disclosed, which can effectively inhibit the generation of fuel type NOx, but can inhibit the generation technology of thermal type NOx; therefore, the existing low-NOx cyclone burner is not suitable for the efficient low-NOx cyclone combustion of raw coke oven gas due to different fuels and different combustion purposes.

In summary, there is a need to solve the problems that the low-NOx burner in the prior art is not suitable for the high-efficiency low-NOx cyclone combustion of the raw coke oven gas and the high-efficiency low-NOx cyclone burner in the prior art cannot be configured for the staged coupling pulverized coal combustion technology because the low-NOx burner does not exist.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the problem that the high-efficient low NOx cyclone burner that is not applicable to the raw coke oven gas to low NOx burner among the prior art and not existing a high-efficient low NOx raw coke oven gas cyclone burner makes it unable for segmentation coupling pulverized coal combustion technology configuration raw coke oven gas cyclone burner, the utility model provides a high temperature raw coke oven gas's cyclone burner is used to the burning.

A first structure of a cyclone burner using high-temperature raw gas comprises:

a cyclone burner for burning high-temperature raw coke oven gas comprises a central tube, an inner peripheral air channel, a raw coke oven gas channel and an outer peripheral air channel which are coaxially arranged from inside to outside, wherein the bottom ends of the central tube, the inner peripheral air channel, the raw coke oven gas channel and the outer peripheral air channel are communicated, and the bottom ends of the central tube, the inner peripheral air channel and the raw coke oven gas channel are flush, wherein the central tube, the inner peripheral air channel and the outer peripheral air channel are all used for introducing air; the raw gas channel is used for introducing raw gas, and the cyclone burner also comprises a water-cooled coil cooling system, a raw gas divergent cone, a raw gas adapter ring, an outer periphery wind diffusion cone, a radial swirler, a diffusion small flame generator, an axial swirler and a blunt body;

the top end of the inner peripheral air channel is sealed through a flange, and the top end of the central pipe penetrates out of the flange;

the central pipe is divided into two sections, namely an upper section pipeline and a lower section pipeline, the upper section pipeline is a part extending out of the inner peripheral wind channel, the lower section pipeline is a part positioned in the inner peripheral wind channel, and the caliber of the upper section pipeline is far smaller than that of the lower section pipeline;

the blunt body is positioned at the bottom end inside the central tube and used for sealing the bottom end of the central tube, and a vent hole is arranged on the blunt body;

the side wall of the inner peripheral air channel is provided with an inner peripheral air inlet, the top end of the raw coke oven gas channel is positioned below the inner peripheral air inlet, and the top end of the raw coke oven gas channel is sealed through a sealing cover plate;

the side wall of the raw gas channel is provided with a raw gas inlet, the raw gas inlet is used for introducing raw gas, the raw gas is gas-solid two-phase flow, the pressure of the raw gas is less than 3MPa, the temperature of the raw gas is 500-980 ℃, and the combustible gas only contains semi-coke and coke particles with particle sizes of less than 70 microns; the bottom end of the raw gas channel is communicated with the raw gas adapter ring through a raw gas divergent taper pipe; the bottom end of the raw gas adapting ring is flush with the outer peripheral air channel;

the top end of the outer peripheral air channel is positioned below the raw coke oven gas inlet, and the top end of the outer peripheral air channel is sealed through a sealing cover plate; the bottom end of the outer periphery wind channel is fixed with an outer periphery wind diffusion taper pipe which is communicated with the outer periphery wind channel; the side wall of the outer periphery air channel is provided with an outer periphery air inlet;

the water-cooling coil cooling system is used for cooling and protecting the raw coke oven gas channel;

an inner peripheral wind annular channel is formed between the outer side wall of the central pipe and the inner side wall of the inner peripheral wind channel, and the radial swirler is arranged in the inner peripheral wind annular channel and used for adjusting the swirling strength of inner peripheral wind in the inner peripheral wind annular channel;

a raw gas annular channel is formed between the outer side wall of the inner peripheral air channel and the inner side wall of the raw gas channel, and the small diffusion flame generator is arranged at the bottom end of the raw gas annular channel and is used for spraying a plurality of strands of raw gas airflow which are circumferentially and uniformly distributed and igniting the plurality of strands of raw gas airflow to form small multiple diffusion flames;

an outer peripheral wind annular channel is formed between the outer side wall of the raw gas channel and the inner side wall of the outer peripheral wind channel, and the axial swirler is arranged at the bottom end of the outer peripheral wind annular channel and used for adjusting the swirling strength of the outer peripheral wind.

A second structure of the cyclone burner using high-temperature raw gas comprises:

a cyclone burner for burning high-temperature raw coke oven gas comprises a central tube, an inner peripheral air channel, a raw coke oven gas channel and an outer peripheral air channel which are coaxially arranged from inside to outside, wherein the bottom ends of the central tube, the inner peripheral air channel, the raw coke oven gas channel and the outer peripheral air channel are communicated, and the bottom ends of the central tube, the inner peripheral air channel and the raw coke oven gas channel are flush, wherein the central tube, the inner peripheral air channel and the outer peripheral air channel are all used for introducing air; the raw gas channel is used for introducing raw gas, and is characterized in that the cyclone burner also comprises a water-cooling coil cooling system, a raw gas divergent cone, a raw gas adapter ring, an outer peripheral wind diffusion cone, a radial swirler, a small diffusion flame generator, an axial swirler and a blunt body;

the bluff body is fixedly sleeved at the bottom end of the outer part of the central tube, is arranged opposite to the radial swirler and has a distance between the bluff body and the radial swirler; the caliber of the central tube is far smaller than that of the inner peripheral wind channel;

Preferably, the diffusion small flame generator is of a circular ring structure, and N axial nozzles are uniformly arranged in the circumferential direction of the circular ring structure, wherein N is an integer greater than or equal to 5.

Preferably, the radial section of the axial jets is of the same or gradual diameter; wherein, the gradual change mode comprises gradual change or gradual change.

Preferably, the water-cooling coil cooling system comprises two water-cooling coils, wherein the first water-cooling coil is positioned in the outer peripheral wind annular channel and is coiled on the outer side wall of the raw gas channel, and the second water-cooling coil is positioned in the inner peripheral wind annular channel and is coiled on the inner side wall of the inner peripheral wind channel;

circulating cooling water is introduced into the two water-cooling coils for cooling and protecting the raw coke oven gas channel.

Preferably, the water-cooling coil cooling system further comprises a valve, a water inlet pipeline, a downcomer, a high-pressure circulating pump and a water return pipeline which are positioned outside the combustor;

the down pipe is simultaneously communicated with the water inlets of the two water-cooling coil pipes through a water inlet pipeline, the down pipe is simultaneously communicated with the water return ports of the two water-cooling coil pipes through a water return pipeline,

the valve is arranged on the water inlet pipeline;

the high-pressure circulating pump is arranged on the water return pipeline and used for returning the water in the two water-cooling coil pipes to the downcomer.

Preferably, the radial cross-section of the axial jets is tapered or divergent at an included angle of 20 ° to 70 °.

Preferably, the distance between the outlet end face of the raw gas adapter ring and the outlet end face of the central tube is H₁And H is₁(0.5 to 1.5) D1; where D1 denotes the outer diameter of the lower section of the center tube.

Preferably, the distance between the outlet end face of the raw gas adapter ring and the outlet end face of the central tube is H₁And H is₁(0.5 to 1.5) D2; wherein D2 denotes the outer diameter of the blunt body.

Preferably, the radial section of the crude gas divergent cone pipe is a rectangular, square or circular straight pipe, and the divergence angle A1 of the crude gas divergent cone pipe is 15-35 degrees;

the radial section of the inner peripheral wind channel is a rectangular, square or circular straight pipe;

the radial section of the raw gas channel is a rectangular, square or circular straight pipe;

the radial section of the raw gas adapting ring is a rectangular, square or circular straight pipe.

Principle and performance: the utility model uses high temperature raw gas as fuel, and has three factors of ignition and combustion of high temperature, fuel and oxidant, so that there is no ignition problem, namely absolute ignition;

and (3) stable combustion: the raw gas is combusted by adopting the raw gas diffusion small flame and the raw gas wrapped by the inner and outer peripheral wind, the diffusion flame is absolutely stable in combustion theoretically, the stable combustion mechanism of the raw gas diffusion small flame is not based on weak vortex backflow heat, because the weak vortex backflow gas is the inner peripheral wind rather than hot smoke, the axial and radial changes of the outflow of hot gas-solid two-phase flow fields such as raw gas fuel, air oxidizer and the like are realized through weak vortex, namely: the velocity distribution of the raw gas fuel, the air oxidant and the combustion products can enable the air velocity to effectively match the propagation velocity of combustible gas, coke and semicoke particles ignition combustion flame of the raw gas in a wider velocity range in the boundary layer of the weak vortex outer boundary, thereby realizing absolute stable combustion in practical significance;

low NOx: the air distribution design of the raw coke oven gas requires that the raw coke oven gas diffusion small flame carries out fuel-rich combustion and gasification at the temperature level of 1100 ℃ in the integral burner region of the high-temperature coal oven according to a sectional coupling pulverized coal combustion method, not only near the burner field, thus expanding the space and time for inhibiting the generation of fuel type NOx, continuously improving the carbon conversion rate along with the progress of the fuel-rich combustion and gasification of the raw coke oven gas, preferably reaching more than 80 percent, and maximally realizing the mechanism of inhibiting the generation of fuel type NOx by the fuel-rich combustion; on the other hand, the raw gas diffusion small flame is designed to occur in the outer boundary layer of the weak vortex, which is beneficial to self-cooling of the flame, and also avoids the situation that high-temperature flue gas flows back to the bottom of the central tube, and the backflow gas is only in the backflow vortex core of a small part of inner peripheral wind, so that the occurrence of thermal NOx in the vortex core is inhibited, the outer peripheral wind is mixed and cooled in time to maintain the combustion and gasification in the temperature level of 1100 ℃ in the integral burner region, and the low-temperature combustion can obviously inhibit the occurrence of thermal NOx;

preventing slagging and high-temperature corrosion: all the raw gas diffusion small flames are wrapped by the inner and outer peripheral winds, the combined jet flow is standardized by the diffusion ring, the near field of the burner and the water wall area nearby the burner are in a favorable state of low temperature and strong oxidizing atmosphere and no particle scouring, so that the occurrence of slag bonding and high-temperature corrosion of the burner and the water wall surface nearby the burner can be prevented;

high efficiency: under the favorable condition of realizing the performance, the efficient combustion of the raw coke oven gas can be implemented under sufficient conditions by scientifically introducing overfire air and implementing the rapid burnout of the oxidizing atmosphere at the temperature level of 1300 ℃ in the area above the combustor area in the pulverized coal furnace according to the sectional coupling pulverized coal combustion principle;

and (3) cooling: the water cooling and air cooling integrated cooling mode is adopted, the forced circulating water cooling of the burner is implemented by using a water cooling coil cooling system, and the water cooling coil carries out soot blowing and air cooling protection in the process of injecting the water cooling coil into the furnace through inner and outer peripheral air;

load response and low load performance: on the key premise of absolute ignition and stable combustion, the minimum air volume of the inner peripheral air is designed according to the rated load of the cyclone burner or the rated power (25-30)% of the cyclone burner, so that the commercial requirement of (25-30)% of low load can be safely and effectively met; because the raw coke oven gas is absolutely ignited and stably combusted, the raw coke oven gas can be quickly ignited and stably combusted in a conventional overload range, and compared with direct combustion of pulverized coal, the method can obviously improve the load response characteristic and has quick load response;

adaptability of coal types: as long as can be through segmentation coupling pulverized coal burner with the coal reform do in the quick fluidized bed of preferred low temperature section two whirlpools raw coal gas, let in a fire and use high temperature raw coal gas cyclone burner, just can realize the coal burning in the high temperature section pulverized coal stove of segmentation coupling pulverized coal burning high-efficiently cleanly, so, the utility model discloses can be applicable to the segmentation coupling burning of extensive coal kind.

The utility model has the beneficial effect of bringing, the utility model discloses a current segmentation coupling pulverized coal combustion technique provides a high temperature combustor, and the fuel is crude gas, crude gas do, by the quick fluidized bed production of preferred two whirlpools, pressure be less than 3MPa, the temperature is 500 ℃ to 980 ℃, only contain the gas-solid two-phase flow that takes semicoke, the coke granule of granule particle diameter scope to be less than 70 microns in the combustible gas, so, the utility model relates to a novel cyclone burner of special fuel.

The utility model discloses a use high temperature raw coke oven gas cyclone burner, through dispose on a segmentation coupling pulverized coal burning's pulverized coal stove, reform the concentrated flame of traditional pulverized coal burning into the little flame of raw coke oven gas diffusion of cyclic distribution, there is not the problem of catching fire, surely catches fire and surely fires in weak swirl outer boundary layer; in the integral burner region, the fuel-rich low-temperature combustion at the temperature level of 1100 ℃ expands the action space and time of the mechanism for inhibiting the generation of fuel type NOx by the combustion of reducing atmosphere and can inhibit the generation of thermal type NOx, small diffusion flames are ignited and stably combusted in the outer boundary layer of the weak vortex, the cooling of the flame of the raw gas is facilitated, the high-temperature smoke gas can be prevented from flowing back into the weak vortex, and the generation of the thermal type NOx is particularly inhibited; the design that the inner and outer peripheral wind wraps the raw gas diffusion small flame and the synergistic effect of the raw gas divergent taper pipe, the raw gas adapter ring and the peripheral wind improve the high-temperature corrosion resistance and the slagging resistance of the combustor and the water-cooled wall near the combustor; the raw coal is burnt instead of directly burning raw coal, so that the abrasion resistance of the burner is improved; the comprehensive cooling technology of the air cooling and water cooling coil cooling system has the advantages that the defect that the cooling of a conventional water cooling jacket is easy to leak is overcome, the water system of cooling water cannot be polluted, the safety and the reliability are realized, and the service life of the combustor is prolonged; absolute ignition and stable combustion improve the load response capability; the absolute ignition and stable combustion create sufficient favorable conditions for high-efficiency combustion.

To sum up, the utility model discloses based on the little flame of raw coke oven gas diffusion, weak swirl outer boundary in situ catch fire surely to burn, air classification, water-cooling and air cooling synthesize the cooling technique, realized the high-efficient clean whirl burning of raw coke oven gas, have absolutely catch fire surely to burn, show that suppression fuel type and heating power type NOx take place, high-efficient, prevent slagging scorification and high temperature corrosion, load response good, the characteristics of reliable cooling, the utility model is suitable for a segmentation coupling pulverized coal combustion of extensive coal kind.

Drawings

FIG. 1 is a schematic diagram of a structure of a cyclone burner using high-temperature raw coke oven gas according to the present invention;

fig. 2 is a schematic diagram of a second structure of the cyclone burner using high-temperature raw coke oven gas of the present invention.

FIG. 3 is a schematic view of the construction of the diffusion small flame generator 10;

fig. 4 is a schematic diagram of the water-cooled coil cooling system 5.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

A first structure of a cyclone burner using high-temperature raw gas comprises:

referring to fig. 1, the embodiment is described, and the cyclone burner using high-temperature raw coke oven gas in the embodiment comprises a central tube 1, an inner peripheral air channel 2, a raw coke oven gas channel 3 and an outer peripheral air channel 4 which are coaxially arranged from inside to outside, wherein the bottom ends of the central tube 1, the inner peripheral air channel 2 and the raw coke oven gas channel 3 are communicated, and the bottom ends of the central tube 1, the inner peripheral air channel 2 and the outer peripheral air channel 4 are flush, wherein the central tube 1, the inner peripheral air channel 2 and the outer peripheral air channel 4 are all used for introducing air; the raw gas channel 3 is used for introducing raw gas, and is characterized in that the cyclone burner also comprises a water-cooling coil cooling system 5, a raw gas gradually-expanding conical tube 6, a raw gas adapter ring 7, an outer peripheral wind diffusion conical tube 8, a radial swirler 9, a small diffusion flame generator 10, an axial swirler 11 and a blunt body 12;

the top end of the inner peripheral air channel 2 is sealed through a flange 13, and the top end of the central tube 1 penetrates through the flange 13;

the central pipe 1 is divided into two sections, namely an upper section pipeline and a lower section pipeline, wherein the upper section pipeline is a part extending out of the inner peripheral air channel 2, the lower section pipeline is a part positioned in the inner peripheral air channel 2, and the caliber of the upper section pipeline is far smaller than that of the lower section pipeline;

the blunt body 12 is positioned at the bottom end inside the central tube 1 and used for sealing the bottom end of the central tube 1, and the blunt body 12 is provided with a vent hole;

an inner peripheral air inlet 2-1 is arranged on the side wall of the inner peripheral air channel 2, the top end of the raw coke oven gas channel 3 is positioned below the inner peripheral air inlet 2-1, and the top end of the raw coke oven gas channel 3 is sealed through a sealing cover plate;

the side wall of the raw gas channel 3 is provided with a raw gas inlet 3-1, the raw gas inlet 3-1 is used for introducing raw gas, the raw gas is gas-solid two-phase flow of which the pressure is less than 3MPa, the temperature is 500-980 ℃, and the combustible gas only contains semicoke and coke particles with particle size of less than 70 microns; the bottom end of the raw gas channel 3 is communicated with a raw gas adapter ring 7 through a raw gas divergent taper pipe 6; the bottom end of the raw gas adapting ring 7 is flush with the outer peripheral air channel 4;

the top end of the outer peripheral air channel 4 is positioned below the raw coke oven gas inlet 3-1, and the top end of the outer peripheral air channel 4 is sealed through a sealing cover plate; the bottom end of the outer periphery wind channel 4 is fixed with an outer periphery wind diffusion taper pipe 8 which is communicated with the outer periphery wind channel; an outer periphery wind inlet 4-1 is arranged on the side wall of the outer periphery wind channel 4;

the water-cooling coil cooling system 5 is used for cooling and protecting the raw coke oven gas channel 3;

an inner peripheral wind annular channel is formed between the outer side wall of the central tube 1 and the inner side wall of the inner peripheral wind channel 2, and a radial swirler 9 is arranged in the inner peripheral wind annular channel and used for adjusting the swirling strength of inner peripheral wind in the inner peripheral wind annular channel;

a raw gas annular channel is formed between the outer side wall of the inner peripheral air channel 2 and the inner side wall of the raw gas channel 3, and the small diffusion flame generator 10 is arranged at the bottom end of the raw gas annular channel and is used for spraying a plurality of strands of raw gas air flows which are annularly and uniformly distributed and igniting the plurality of strands of raw gas air flows to form small multiple diffusion flames; an outer peripheral wind annular channel is formed between the outer side wall of the raw gas channel 3 and the inner side wall of the outer peripheral wind channel 4, and an axial swirler 11 is arranged at the bottom end of the outer peripheral wind annular channel and used for adjusting the swirling strength of outer peripheral wind.

referring to fig. 2, the embodiment is described, and the cyclone burner using high-temperature raw coke oven gas in the embodiment comprises a central tube 1, an inner peripheral air passage 2, a raw coke oven gas passage 3 and an outer peripheral air passage 4 which are coaxially arranged from inside to outside, wherein the bottom ends of the central tube 1, the inner peripheral air passage 2 and the raw coke oven gas passage 3 are communicated, and the bottom ends of the central tube 1, the inner peripheral air passage 2 and the outer peripheral air passage 4 are flush, wherein the central tube 1, the inner peripheral air passage 2 and the outer peripheral air passage 4 are all used for introducing air; the raw gas channel 3 is used for introducing raw gas, and is characterized in that the cyclone burner also comprises a water-cooling coil cooling system 5, a raw gas gradually-expanding conical tube 6, a raw gas adapter ring 7, an outer peripheral wind diffusion conical tube 8, a radial swirler 9, a small diffusion flame generator 10, an axial swirler 11 and a blunt body 12;

the blunt body 12 is fixedly sleeved at the bottom end of the outer part of the central tube 1, the blunt body 12 is arranged opposite to the radial swirler 9, and a space is formed between the blunt body 12 and the radial swirler; the caliber of the central tube 1 is far smaller than that of the inner peripheral wind channel 2;

When the swirl burner with the two structures is used, firstly, the water-cooled coil cooling system 5 is started, air is introduced into the central tube 1, the inner peripheral air channel 2 and the outer peripheral air channel 4, raw gas is introduced into the raw gas channel 3, a plurality of strands of raw gas airflow which is ejected by the small diffusion flame generator 10 and is circumferentially and uniformly distributed is ignited by an ignition device such as an oil gun thrown in the central tube 1 until a plurality of strands of stable raw gas small flames are formed in a weak swirl (backflow) outer boundary layer formed by combining the blunt body 12, the inner peripheral air and the outer peripheral air, and then the ignition device is withdrawn, and the ignition stable position of the raw gas small diffusion flame from a burner nozzle can be properly adjusted through the active intervention of the central air on the weak swirl; the bluff body 12 regulates the characteristic dimension of the inner diameter of the weak swirl vortex, the inner peripheral wind flows back into the weak vortex in a small part, and is mainly used for ignition stable combustion and combustion of a plurality of strands of raw gas to form multiple diffusion small flames of absolute ignition stable combustion, the raw gas forms stable multiple small flames after being ignited, the raw gas is mixed and cooled in time by virtue of the outer peripheral wind in the process of developing the combustion of downstream rich fuel, the raw gas combustion and gasification at the temperature level of 1100 ℃ are implemented in the integral burner region of the pulverized coal furnace, and after the reduction atmosphere thermochemical conversion at the stage, the carbon conversion rate reaches over 80 percent, so that the action space and time of the rich fuel combustion mechanism are fully expanded, the fuel type NOx is deeply inhibited, and the relatively low-temperature raw gas combustion also fully inhibits the thermal type NOx; the overfire air and the overfire air are reasonably organized in the oxidizing atmosphere region above the pulverized coal furnace combustion region, and the raw coke oven gas is combusted under sufficient conditions, so that the high-efficiency combustion is realized.

In the process of raw coke oven gas combustion, air is continuously introduced into the central tube 1, so that the reverse flow of smoke is prevented, the center of the cyclone burner is cooled, and the end face of the central tube is prevented from being slagging and high-temperature corrosion.

The inner peripheral wind is used for promoting the ignition, stable combustion and burning of the raw coke oven gas, the outer peripheral wind is used for cooling the burning flame of the raw coke oven gas and supporting combustion of the raw coke oven gas, and when the rotational flow strength of the inner peripheral wind and the outer peripheral wind is in the limit condition of 0, the rotational flow combustor burning the high-temperature raw coke oven gas is a direct current combustor.

When the cyclone burner is used, the minimum air volume of the inner peripheral air is designed according to the rated load of the cyclone burner or the rated power (25-30)% of the cyclone burner.

Under the condition of furnace shutdown, firstly, the raw gas is stopped to be introduced until the raw gas is completely cooled, and then the inner and outer peripheral air, the central air and the water-cooling coil cooling system 5 are stopped in sequence.

The water-cooling coil cooling system 5 is cooled and deashed by wind at the inner and outer peripheries, and performs comprehensive cooling of water cooling and air cooling of the combustor to exert respective cooling advantages, thereby reliably realizing the cooling protection of the combustor.

The inner peripheral air channel 2 provides radial rotational flow and the inner peripheral air is blown and cooled by the water-cooling coil cooling system 5, and the caliber of the inner peripheral air channel 2 regulates the characteristic size of the radial inner diameter of the combined jet flow.

The outer periphery air channel 4 provides axial rotational flow and also performs soot blowing and air cooling operations on the water-cooling coil cooling system 5 in the outer periphery air process, and the caliber of the outer periphery air channel 4 regulates the characteristic dimension of the radial outer diameter of the combined jet flow.

The cyclone burner burning high-temperature raw coke oven gas reforms the concentrated flame of the traditional pulverized coal combustion, changes the concentrated flame into the small diffusion flame which is annularly and uniformly distributed, and creates favorable conditions for ignition and stable combustion in the outer boundary layer of the weak vortex, inhibiting the generation of fuel type, particularly thermal NOx, improving the slagging resistance and high-temperature corrosion resistance of the burner and the water wall of the area near the burner, improving the wear of the burner, cooling, prolonging the service life of the burner and improving the load response capability;

in the integral burner area, the absolute ignition stable combustion and the diffusion small flame of the crude gas in the weak vortex outer boundary layer are mixed and cooled in time through the outer boundary wind, the low-temperature combustion at the temperature level of 1100 ℃ is implemented, and the thermal NOx can be obviously inhibited; the utility model has no ignition problem, expands the coal adaptability, and theoretically, the stable combustion performance of the utility model is also absolute stable combustion because the diffusion flame absolutely stably combusts; the raw gas divergent cone 6, the raw gas adapter ring 7 and the peripheral wind cooperatively act on the combustor and the water-cooled wall of the area near the combustor to prevent slagging and high-temperature corrosion; the comprehensive cooling technology of the air cooling and water cooling coil cooling system 5 has the defects of no water cooling jacket and easy leakage, does not pollute a water system, and is safe and reliable; because the fuel is the raw coke oven gas, compare with the buggy, the abrasionproof of combustor decreases the performance and obtains improving fundamentally, a swirl burner that burns high temperature raw coke oven gas more than performance fundamentally has created the advantage for high-efficient burning.

Further, referring specifically to fig. 3, the diffusion small flame generator 10 is a circular ring structure, and N axial nozzles 10-1 are uniformly arranged along the circumferential direction of the circular ring structure, where N is an integer greater than or equal to 5.

In the preferred embodiment, the N axial nozzles 10-1 uniformly arranged in the circumferential direction enable the raw coke oven gas to be sprayed out from the axial nozzles 10-1, the raw coke oven gas is reconstructed into a plurality of strands of raw coke oven gas, the raw coke oven gas is ignited, a multiple diffusion small flame is formed, the small flame is convenient for the flame to be cooled, and the method is one of the keys for realizing the absolute stability and the inhibition of thermal NOx of the raw coke oven gas fuel cyclone burner.

Further, with particular reference to fig. 2, the radial cross-section of the axial jets 10-1 is of the same or gradually varying diameter; wherein, the gradual change mode comprises gradual change or gradual change.

In the preferred embodiment, the axial nozzle 10-1 is arranged to be gradually enlarged or reduced in order to accelerate or decelerate the raw gas to be injected into the furnace chamber, so as to control the injection momentum of the injected raw gas and determine the load or power of the burner.

Further, referring specifically to fig. 4, the water-cooling coil cooling system 5 includes two water-cooling coils 5-1, wherein the first water-cooling coil 5-1 is located in the outer peripheral wind annular channel and is wound on the outer side wall of the raw gas channel 3, and the second water-cooling coil 5-1 is located in the inner peripheral wind annular channel and is wound on the inner side wall of the inner peripheral wind channel 2;

circulating cooling water is introduced into the two water-cooling coils 5-1 to cool and protect the raw coke oven gas channel 3.

In the preferred embodiment, the two water-cooled coils 5-1 are made of heat-resistant and pressure-resistant material such as 15CrMo, and other parts of the cyclone burner using high-temperature raw coke oven gas can be made of aluminum oxide iron alloy, HAYNES188 alloy or heat-resistant steel.

The two water-cooling coils 5-1 are respectively cooled and deashed by wind at the inner and outer peripheries, and the water-cooling and wind-cooling comprehensive cooling of the combustor is implemented to exert respective cooling advantages, so that the cooling protection of the combustor is reliably realized.

For a specific application, the two water-cooled coils 5-1 may be in a staggered configuration in the circumferential direction, preferably in a single layer configuration.

Further, referring specifically to fig. 4, the water-cooling coil cooling system 5 further includes a valve 5-2 located outside the combustor, a water inlet pipeline 5-3, a downcomer 5-4, a high-pressure circulation pump 5-5, and a water return pipeline 5-6;

the down pipe 5-4 is simultaneously communicated with the water inlets of the two water-cooling coils 5-1 through a water inlet pipeline 5-3, the down pipe 5-4 is simultaneously communicated with the water return ports of the two water-cooling coils 5-1 through a water return pipeline 5-6,

the valve 5-2 is arranged on the water inlet pipeline 5-3;

the high-pressure circulating pump 5-5 is arranged on the water return pipeline 5-6 and is used for pumping water in the two water-cooling coil pipes 5-1 back to the downcomer 5-4.

Further, the water-cooled coil cooling system 5 is operated at a pressure slightly higher than the furnace pressure.

In the preferred embodiment, the operating pressure of the water-cooling coil cooling system 5 is set to be slightly higher than the furnace pressure, in order to prevent the cooling water of the water-cooling coil cooling system 5 from being contaminated due to accidental leakage.

Still further, referring specifically to FIG. 3, the radial cross-section of the axial jets 10-1 is tapered or divergent at an included angle of 20 to 70.

Further, referring specifically to fig. 1, in the first structure of the cyclone burner using high-temperature raw coke oven gas, the distance between the outlet end surface of the raw coke oven gas adapting ring 7 and the outlet end surface of the central tube 1 is H₁And H is₁0.5-1.5D 1; where D1 denotes the outer diameter of the lower pipe of the center pipe 1.

Further, referring specifically to fig. 2, in the second structure of the cyclone burner using high-temperature raw coke oven gas, the distance between the outlet end surface of the raw coke oven gas adapting ring 7 and the outlet end surface of the central tube 1 is H₁And H is₁0.5-1.5D 2; where D2 denotes the outer diameter of the blunt body 12.

Further, referring specifically to fig. 3, the radial cross section of the raw coke oven gas divergent cone 6 is a rectangular, square or circular straight tube, and the divergence angle a1 of the raw coke oven gas divergent cone 6 is 15 ° to 35 °.

Further, with particular reference to fig. 1 and 2, the radial cross-section of the inner peripheral wind channel 2 is a rectangular, square or circular straight tube;

the radial section of the raw gas channel 3 is a rectangular, square or circular straight pipe;

the radial section of the raw gas adapting ring 7 is a rectangular, square or circular straight pipe.

Furthermore, the cyclone burner using high-temperature raw gas can be horizontally, obliquely and vertically arranged on the combustion equipment.

Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that features described in different dependent claims and herein may be combined in ways different from those described in the original claims. It is also to be understood that features described in connection with individual embodiments may be used in other described embodiments.

Claims

1. A cyclone burner for burning high-temperature raw coke oven gas comprises a central tube (1), an inner peripheral air channel (2), a raw coke oven gas channel (3) and an outer peripheral air channel (4) which are coaxially arranged from inside to outside, wherein the bottom ends of the central tube (1), the inner peripheral air channel (2) and the raw coke oven gas channel (3) are communicated, and are parallel and level, and the central tube (1), the inner peripheral air channel (2) and the outer peripheral air channel (4) are all used for introducing air; the raw gas channel (3) is used for introducing raw gas, and is characterized in that the cyclone burner also comprises a water-cooling coil cooling system (5), a raw gas gradually-expanding conical tube (6), a raw gas adapting ring (7), an outer periphery wind diffusion conical tube (8), a radial swirler (9), a diffusion small flame generator (10), an axial swirler (11) and a blunt body (12);

the top end of the inner peripheral air channel (2) is sealed through a flange (13), and the top end of the central tube (1) penetrates out of the flange (13);

the central pipe (1) is divided into two sections, namely an upper section pipeline and a lower section pipeline, wherein the upper section pipeline is a part extending out of the inner peripheral air channel (2), the lower section pipeline is a part positioned in the inner peripheral air channel (2), and the caliber of the upper section pipeline is far smaller than that of the lower section pipeline;

the blunt body (12) is positioned at the bottom end inside the central tube (1) and used for sealing the bottom end of the central tube (1), and a vent hole is formed in the blunt body (12);

an inner peripheral air inlet (2-1) is arranged on the side wall of the inner peripheral air channel (2), the top end of the raw gas channel (3) is positioned below the inner peripheral air inlet (2-1), and the top end of the raw gas channel (3) is sealed through a sealing cover plate;

a raw gas inlet (3-1) is arranged on the side wall of the raw gas channel (3), the raw gas inlet (3-1) is used for introducing raw gas, and the bottom end of the raw gas channel (3) is communicated with a raw gas adapter ring (7) through a raw gas gradually-expanding taper pipe (6); the bottom end of the raw gas adapting ring (7) is flush with the outer peripheral air channel (4);

the top end of the outer peripheral air channel (4) is positioned below the raw coke oven gas inlet (3-1), and the top end of the outer peripheral air channel (4) is sealed through a sealing cover plate; an outer periphery wind diffusion taper pipe (8) is fixed at the bottom end of the outer periphery wind channel (4) and is communicated with the outer periphery wind diffusion taper pipe; an outer periphery wind inlet (4-1) is arranged on the side wall of the outer periphery wind channel (4);

the water-cooling coil pipe cooling system (5) is used for cooling and protecting the raw coke oven gas channel (3);

an inner peripheral wind annular channel is formed between the outer side wall of the central pipe (1) and the inner side wall of the inner peripheral wind channel (2), and a radial swirler (9) is arranged in the inner peripheral wind annular channel and used for adjusting the swirling strength of inner peripheral wind in the inner peripheral wind annular channel;

a raw gas annular channel is formed between the outer side wall of the inner peripheral air channel (2) and the inner side wall of the raw gas channel (3), and a small diffusion flame generator (10) is arranged at the bottom end of the raw gas annular channel and is used for spraying a plurality of strands of raw gas airflow which are annularly and uniformly distributed and igniting the plurality of strands of raw gas airflow to form small multiple diffusion flames;

an outer peripheral wind annular channel is formed between the outer side wall of the raw gas channel (3) and the inner side wall of the outer peripheral wind channel (4), and an axial swirler (11) is arranged at the bottom end of the outer peripheral wind annular channel and used for adjusting the swirling strength of outer peripheral wind.

2. A cyclone burner for burning high-temperature raw coke oven gas comprises a central tube (1), an inner peripheral air channel (2), a raw coke oven gas channel (3) and an outer peripheral air channel (4) which are coaxially arranged from inside to outside, wherein the bottom ends of the central tube (1), the inner peripheral air channel (2) and the raw coke oven gas channel (3) are communicated, and are parallel and level, and the central tube (1), the inner peripheral air channel (2) and the outer peripheral air channel (4) are all used for introducing air; the raw gas channel (3) is used for introducing raw gas, and is characterized in that the cyclone burner also comprises a water-cooling coil cooling system (5), a raw gas gradually-expanding conical tube (6), a raw gas adapting ring (7), an outer periphery wind diffusion conical tube (8), a radial swirler (9), a diffusion small flame generator (10), an axial swirler (11) and a blunt body (12);

the blunt body (12) is fixedly sleeved at the bottom end of the outer part of the central tube (1), the blunt body (12) is arranged opposite to the radial swirler (9), and a space is reserved between the blunt body and the radial swirler (9); the caliber of the central tube (1) is far smaller than that of the inner peripheral wind channel (2);

3. The cyclone burner for burning high-temperature raw coke oven gas as claimed in claim 1 or 2, wherein the diffusion small flame generator (10) is of a circular structure, and N axial nozzles (10-1) are uniformly arranged along the circumferential direction of the circular structure, wherein N is an integer greater than or equal to 5.

4. The cyclone burner using high-temperature raw coke oven gas as claimed in claim 1 or 2, wherein the diameter of the radial section of the axial nozzle (10-1) is the same or gradually changed; wherein, the gradual change mode comprises gradual change or gradual change.

5. The cyclone burner for burning high-temperature raw gas as claimed in claim 1 or 2, wherein the water-cooling coil cooling system (5) comprises two water-cooling coils (5-1), wherein the first water-cooling coil (5-1) is positioned in the outer peripheral wind annular passage and is coiled on the outer side wall of the raw gas passage (3), and the second water-cooling coil (5-1) is positioned in the inner peripheral wind annular passage and is coiled on the inner side wall of the inner peripheral wind passage (2);

circulating cooling water is introduced into the two water-cooling coils (5-1) to cool and protect the raw coke oven gas channel (3).

6. The cyclone burner burning high-temperature raw coke oven gas as claimed in claim 5, wherein the water-cooled coil cooling system (5) further comprises a valve (5-2) positioned outside the burner, a water inlet pipeline (5-3), a downcomer (5-4), a high-pressure circulating pump (5-5) and a water return pipeline (5-6);

the down pipes (5-4) are simultaneously communicated with the water inlets of the two water-cooling coils (5-1) through water inlet pipelines (5-3), the down pipes (5-4) are simultaneously communicated with the water return ports of the two water-cooling coils (5-1) through water return pipelines (5-6),

the valve (5-2) is arranged on the water inlet pipeline (5-3);

the high-pressure circulating pump (5-5) is arranged on the water return pipeline (5-6) and is used for pumping water in the two water-cooling coils (5-1) back to the downcomer (5-4).

7. The cyclone burner for burning high-temperature raw gas as claimed in claim 4, wherein the radial section of the axial nozzle (10-1) is tapered or divergent at an angle of 20 ° to 70 °.

8. The cyclone burner using high-temperature raw coke oven gas as claimed in claim 1, wherein the distance between the outlet end face of the raw coke oven gas adapting ring (7) and the outlet end face of the central tube (1) is H₁And H is₁(0.5 to 1.5) D1; wherein D1 represents the outer diameter of the lower-stage pipeline of the central tube (1).

9. The cyclone burner using high-temperature raw coke oven gas as claimed in claim 2, wherein the distance between the outlet end face of the raw coke oven gas adapting ring (7) and the outlet end face of the central tube (1) is H₁And H is₁(0.5 to 1.5) D2; wherein D2 represents the outer diameter of the blunt body (12).

10. The cyclone burner burning high-temperature raw coke oven gas as claimed in claim 1 or 2, wherein the radial section of the raw coke oven gas divergent cone (6) is a rectangular, square or round straight tube, and the diffusion angle A1 of the raw coke oven gas divergent cone (6) is 15-35 °;

the radial section of the inner peripheral air channel (2) is a rectangular, square or circular straight pipe;

the radial section of the raw gas channel (3) is a rectangular, square or circular straight pipe;

the radial section of the raw gas adapting ring (7) is a rectangular, square or circular straight pipe.