CN108194922B - Oxygen-enriched combustor capable of adjusting flame - Google Patents

Abstract

The invention discloses an oxygen-enriched combustor capable of adjusting flame. The oxygen-enriched combustor is provided with a bluff body with flexibly adjustable position, the flowing direction and speed of fuel flow can be adjusted, and/or the mixing position of an oxidant and fuel can be changed; passages can also be arranged in the blunt body for conveying oxygen-air or other gases with single components or mixed components; the oxidant passage surrounded by the outer side of the fuel flow outlet end is divided into two parts which are independent up and down and can be respectively introduced with oxidant gas with different components; the upper oxidant passage can be filled with air or oxygen-enriched gas; the lower oxygen passage can be filled with air, oxygen-enriched gas or oxygen; in addition, the downstream end part of the combustor can be provided with a telescopic sleeve I with adjustable length, so that the mixing time, the mixing degree, the ignition point position, the flame direction and the like of the oxidant and the fuel can be adjusted.

Description

Oxygen-enriched combustor capable of adjusting flame

Technical Field

the invention relates to a burner, in particular to an oxygen-enriched burner capable of adjusting flame, wherein the fuel is solid fuel such as petroleum coke powder or coal powder and the like, and the oxygen-enriched burner can be applied to the manufacturing fields of glass, metallurgy, cement, ceramics and the like.

Background

Solid fuels, such as petroleum coke powder and coal powder, have been widely used as inexpensive fuels in the fields of glass kilns, metallurgy, cement, ceramics and the like.

In the case of petroleum coke fuel, the solid fuel is not easy to ignite and burn out due to its own characteristics, and various problems are caused to combustion users due to its complicated composition. Compared with traditional fuels such as heavy oil, natural gas and the like, the petroleum coke powder has higher proportion of sulfur components, and the petroleum coke contains a large amount of solid particles with different particle sizes. Under the action of gravity, solid particles in the flow carrying the solid particles can deviate from a gas flow line, and if the solid particles are blown into the regenerator, the blockage of the regenerator checker is aggravated; if the flame length and stiffness are not ideal, they may impact directly on the refractory, furnace lining, or product; if the flame coverage is not ideal, the heat distribution and the product performance are influenced; especially, when large particles are blown directly into the kiln and scattered on the surface of a product (such as molten glass), the large particles can cause pollution and various defects on the product. The above factors may affect the yield, quality and service life of combustion process equipment, and reduce the product quality; cause erosion of refractory materials and reduce the life of combustion process equipment (e.g., glass tank furnaces); in addition, the exhaust gas from the production process also causes environmental pollution.

From the chinese patent CN102597628B, a burner for delivering gas-propelled particulate solid fuel is known, said burner comprising a burner body (100) and an injector assembly (200), the injector assembly being at least partially surrounded by an injector passage (130) of the burner block, the injector assembly comprising an inner oxygen supply tube (210) surrounding the fuel injector, the inner oxygen supply tube (210) in turn surrounding the oxygen injector (230), each having a downstream end (211, 221, 231) at the channel outlet side, the inner oxygen supply tube having a lateral surface, having mounted thereon a set of lateral primary oxygen nozzles (212) for injecting lateral primary jets of oxygen into the fuel injector in an injection orientation, the injection orientations follow the same rotational direction about the longitudinal direction and are toward the downstream end of the fuel injector, the lateral primary oxygen nozzle is positioned at a plurality of different distances from a downstream end (221) of the fuel injector. Suitable for use in industrial environments where multiple spaced apart streams of oxygen are injected into a mixture of a transport gas and a solid fuel at a combustion chamber. US patent application US20140305355a1 discloses a solid fuel/oxygen burner comprising: a central oxygen passage extending toward a tip of the burner; an outer fuel passage surrounding the oxygen passage; an inner fuel passage positioned between the oxygen passage and the outer fuel passage to form an inner annulus with the oxygen passage and an outer annulus with the outer fuel passage, the inner fuel passage having an exit end upstream of the tip; a flat-topped conical flow splitter within the outer fuel passage, downstream of the inner fuel passage, surrounding the oxygen passage, for splitting the fuel flow in the outer fuel passage into an inner annular conical diffuser and an outer annular convergent nozzle; and at least three radial vanes within the diffuser, wherein the outlet end of the inner fuel passage is spaced apart from the inlet end of the splitter by a distance X. Heat transfer, carbon burnout and flame stability may be improved.

Although various mature solid combustion-oxygen-enriched burners exist in the market at present, the solid combustion-oxygen-enriched burners still have many defects, such as small adjustable range, inconvenient adjustment of oxygen-enriched concentration, inconvenient adjustment of local combustion atmosphere, nonadjustable flame rigidity, length and coverage and the like, which can be improved.

Disclosure of Invention

The invention aims to solve the technical problem of the oxygen-enriched burner, and designs the oxygen-enriched burner which can adjust the flame length, the flame coverage area, the flame rigidity and the local flame atmosphere.

The invention relates to a burner capable of being used for oxygen enrichment, which is provided with a bluff body capable of flexibly adjusting the position, particularly can adjust the position on line and can change the direction, the speed and the distribution of fuel flow; the center of the bluff body can convey oxygen, oxygen-enriched air or gas (such as natural gas) with single component/mixed component with other properties, the mixing position of fuel flow and oxidant flow can be adjusted, and the flame length, area and ignition point can be adjusted; the oxidant pipeline surrounding the fuel flow pipeline outside the fuel outlet of the combustor is divided into an upper part and a lower part which are independent from each other, and oxidant gas with the same or different components can be respectively introduced, the upper oxidant pipeline can be air or oxygen-enriched gas, and the lower oxidant pipeline can be air, oxygen-enriched gas or pure oxygen gas; the burner head part can also be provided with a first sleeve with adjustable length, and the first sleeve can move along the axial direction of the burner body to adjust the mixing distance of the oxidant and the fuel, thereby controlling the mixing time and the mixing degree of the oxidant and the fuel. The invention also provides a furnace having the above burner, comprising one or more of the above oxycombustions, for use in combusting a solid fuel to generate heat.

The invention provides an oxygen-enriched combustor, comprising: a burner lance, wherein the burner lance comprises an inner tube disposed within an outer tube, and an outer tube defining an annular passage therebetween for conveying a stream of oxidant, the downstream ports of the inner and outer tubes together defining a lance tip mounting location thereof; a position-adjustable blunt body arranged in the inner tube, wherein a limit structure and a guide structure which are matched with each other are respectively arranged on the blunt body and the inner wall of the inner tube, and a channel defined between the inner tube and the blunt body is used for conveying fuel flow; the upstream port of the isolation sleeve is sleeved on the downstream port of the inner pipe, and the inner diameter of the isolation sleeve is smaller than or equal to that of the inner pipe; the burner cap is sleeved on the outer pipe of the burner body and fixedly connected to the mounting part of the burner head of the burner body, the burner cap comprises a fuel outlet channel and a plurality of oxidant outlet channels, the fuel outlet channel is located at the axial center of the burner cap, the downstream port of the isolation sleeve is sleeved on the downstream port of the fuel outlet channel of the burner cap in a clamping mode, the oxidant outlet channels surround the periphery of the fuel outlet channel and are independent of each other, oxidant flows to the oxidant outlet channel through a channel defined by the inner side wall of the burner cap and the outer wall of the isolation sleeve, the fuel flows out of the fuel outlet channel of the burner cap through the isolation sleeve, and the fuel flows and the oxidant flows are independent of each other before flowing out of the fuel outlet channel and the oxidant outlet channel of the burner cap.

In some preferred embodiments, the annular passage defined between the outer tube and the inner tube is divided into upper and lower semi-annular passages independent of each other for conveying the first oxidant and the second oxidant, respectively, which do not mix with each other before flowing out of the respective oxidant outlet passages, and the two oxidant compositions may be different.

in some embodiments, the plurality of oxidant outlet passages on the gun cap are also divided into upper first and lower second oxidant outlet passages that are independent of each other, the first and second oxidants flow out of the downstream ports of the upper first and lower second oxidant outlet passages, respectively, independently of each other, and a separation block is disposed within the gun cap to separate the first and second oxidant flows to ensure that they are independent of each other before flowing out of the oxidant outlet passages.

In some embodiments, there are more of the lower second oxidant outlet passages than the upper first oxidant outlet passages.

In some preferred embodiments, the total flow rate of the lower second oxidant is greater than the total flow rate of the upper first oxidant.

In some embodiments, the lower second oxidant outlet passage cross-sectional area is greater than the upper first oxidant outlet passage cross-sectional area, the lower second oxidant outlet passage cross-sectional area being 1-8 times the upper first oxidant outlet passage cross-sectional area.

Preferably, the lower second oxidant outlet passage cross-sectional area is 1.5 to 3 times the upper first oxidant outlet passage cross-sectional area.

Preferably, the oxidant outlet channels are arranged at different included angles of 0-15 degrees in the X/Y/Z axis direction relative to the axis center line direction of the fuel outlet channel to form a vortex flow field.

In some preferred embodiments of the present invention, the blunt body comprises a passage for delivering the third oxidant, the passage having an upstream inlet end for the third oxidant and a downstream outlet end for the third oxidant.

Preferably, the limiting structure and the guiding structure of the blunt body are a bracket and a guide groove, the bracket is arranged at the front part of the blunt body, and the guide groove is arranged on the inner wall of the inner pipe, and the bracket and the guide groove are matched for use to play a role in limiting and guiding.

In some preferred embodiments of the present invention, the position of the blunt body may be adjusted on-line, and the rear end of the blunt body is a long tube, which may be hollow, for delivering the third oxidant, and the long tube may be stretched back and forth to adjust the position of the blunt body in the burner. When the front end of the bluff body is positioned in the gun cap, the third oxidant conveyed in the bluff body can be mixed with the fuel in the isolation sleeve; the position of the blunt body may be adjusted to adjust the mixing position of the third oxidizer and the fuel.

In some preferred embodiments of the present invention, the sectional area of the front end of the blunt body is greater than 50% of the sectional area of the inner tube, and more preferably, the sectional area of the front end of the blunt body is 55% to 75% of the sectional area of the inner tube.

In some preferred embodiments of the present invention, the distance between the front end surface of the bluff body near the outlet end and the front end surface of the outlet end of the gun cap is adjustable to be 0 to 1 times the diameter of the inner tube, and more preferably, the distance is 0 to 0.5 times the diameter of the inner tube.

Preferably, the material of the blunt body is heat-resistant metal or heat-resistant ceramic, and the blunt body is heat-resistant metal or heat-resistant ceramic capable of resisting a high temperature of 700 ℃.

In some preferred embodiments of the invention, the front end of the bluff body near the lance tip is cylindrical or conical.

In some embodiments of the invention, the first oxidant is selected from oxygen, or a mixture of oxygen and air (i.e., oxygen-enriched air), preferably a mixture of oxygen and air.

In some embodiments of the invention, the second oxidant is selected from oxygen, or a mixture of oxygen and air (i.e. oxygen-enriched air), preferably oxygen.

in some embodiments of the invention, the third oxidant is selected from oxygen, or a mixture of oxygen and air (i.e., oxygen-enriched air), or other single component or mixed component gases (e.g., natural gas, etc.).

In some preferred embodiments of the present invention, a first sleeve which can move along the axial direction of the gun body is sleeved at the downstream port of the gun cap.

Preferably, the distance between the plane of the gun cap downstream port and the plane of the sleeve one downstream port is adjustable to be 0-15 cm. The first sleeve can extend out from the downstream end of the gun cap, the extending length is 0-15cm, namely the distance between the plane of the downstream port of the gun cap and the plane of the downstream port of the first sleeve can be 0-15 cm.

In some preferred embodiments of the invention, the sleeve is adjustable by a telescopic rod fixed on the outer wall of the gun body.

In some embodiments of the invention, the use of the burner for combusting a solid fuel in a combustion chamber of an industrial furnace to generate heat therein.

In some embodiments of the invention, the solid fuel comprises, but is not limited to, petroleum coke fines, coal fines, biomass particles.

The invention also relates to an industrial furnace comprising a furnace wall defining a combustion chamber, at least one burner of any of the above mentioned types, said burner being mounted in the furnace wall such that a downstream outlet face of said burner gun body faces said combustion chamber and such that an upstream inlet face of said burner gun body is accessible from outside said combustion chamber.

In some embodiments of the invention, the burner is mounted in the furnace wall such that the downstream exit face of the burner gun body is recessed relative to an inner surface of the furnace wall facing the combustion chamber, thereby forming a wider pre-combustion section between the downstream exit face of the burner gun body and the inner surface of the furnace wall.

In some embodiments of the invention, the industrial furnace comprises at least one combustion port, and one or more burners positioned near an edge of the at least one combustion port.

The invention is particularly advantageously used in furnaces for producing glass.

Drawings

Fig. 1 is an external schematic side view of an embodiment of the burner of the present invention.

FIG. 2 is a schematic cross-sectional view of an embodiment of a burner of the present invention.

FIG. 3 is a detail view of the combustor downstream end configuration in one embodiment of the combustor of the present invention.

Fig. 4a is a schematic view of a bluff body structure in an embodiment of the burner of the present invention.

Fig. 4b is a partially enlarged schematic view of fig. 4 a.

Fig. 5 is a side view of a schematic illustration of a gun cap construction in an embodiment of the burner of the present invention.

Fig. 6 is a front view of a gun cap structure in another embodiment of the burner of the present invention.

Fig. 7 is a rear view of a gun cap structure in another embodiment of the burner of the present invention.

FIG. 8 is a schematic diagram of the configuration of an isolation sleeve separating the fuel and oxidant streams in one embodiment of a combustor of the present invention.

Fig. 9 is a schematic view of an industrial furnace in one embodiment of the burner of the present invention.

Fig. 10a is a simulation diagram of combustion effect of a general air combustion burner.

FIG. 10b is a simulation of the combustion effect of the burner of the present invention.

The figures are generally schematic and are not drawn to scale for the sake of clarity. All figures share the same reference numerals for the same or corresponding features.

1-a burner body, 2-an inner tube, 3-an outer tube, 4-an annular channel, 4-1-an upper half annular channel, 4-2-a lower half annular channel, 5-a bluff body, 6-a limiting structure, 7-a guiding structure, 8-an isolation sleeve, 9-an isolation sleeve upstream port, 10-a gun cap, 11-a fuel outlet channel, 12-an oxidant outlet channel, 12-1-an upper first oxidant outlet channel, 12-2-a lower second oxidant outlet channel, 13-an isolation sleeve downstream port, 14-a bluff body internal third oxidant passage, 15-a bluff body front end, 16-a sleeve one, 17-a telescopic rod, 18-a furnace, 19-a combustion chamber, 20-a bluff body, 21-a burner, 22-isolation stop.

Detailed Description

For the purposes of this description, the following definitions are made herein. The transport gas is a gaseous fluid used to transport solid fuel particles, including but not limited to air, oxygen-enriched air, nitrogen, carbon dioxide, recycled flue gas, or a combination of any of the foregoing. The solid fuel is mixed with the transport gas to form a pulverized fuel stream. Oxygen enrichment is a gas comprising an oxygen concentration of more than 21 vol%, oxygen being a gas with an oxygen content of more than 90 vol%. Solid fuels are solid hydrocarbon fuels including, but not limited to, petroleum coke, various coals (bituminous coal, anthracite, lignite, peat, etc.), various biomass materials, municipal solid waste, and combinations thereof.

Several embodiments and variations of the oxycombustion burners are described herein.

In which fig. 1 and 2 are an embodiment of an oxycombustion burner. As shown in fig. 2, an oxycombustion burner of the present invention comprises: a burner lance 1, wherein the burner lance comprises an inner tube 2 and an outer tube 3, the inner tube 2 being disposed within the outer tube 3, as shown in fig. 2, an annular channel 4 being defined between the outer tube 3 and the inner tube 2 for conveying a stream of oxidant, the downstream ports of the inner and outer tubes 2, 3 together defining the lance tip mounting location thereof; a position-adjustable blunt body 5, which is arranged in the inner tube, wherein a limit structure 6 and a guide structure 7 are respectively arranged on the blunt body and the inner wall of the inner tube, and a channel defined between the inner tube and the blunt body is used for conveying fuel flow; as shown in fig. 8, an upstream port 9 of the isolation sleeve is sleeved on a downstream port of the inner pipe, and the inner diameter of the isolation sleeve is the same as that of the inner pipe; the burner cap 10 is sleeved on the outer tube of the burner body and fixedly connected to the mounting portion of the burner head of the burner body, and the burner cap includes a fuel outlet channel 11 and a plurality of oxidant outlet channels 12, wherein the fuel outlet channel is located at the axial center of the burner cap, as shown in fig. 3, the downstream port 13 of the isolation sleeve is sleeved on the downstream port of the fuel outlet channel 11 of the burner cap in a clamping manner, the oxidant outlet channels 12 surround the periphery of the fuel outlet channel 11 and are independent from each other, oxidant flows to the oxidant outlet channel 12 through a channel defined by the inner side wall of the burner cap and the outer wall of the isolation sleeve, and fuel flows out of the burner cap through the interior of the isolation sleeve 8.

In a similar manner, the annular passage defined between the outer and inner tubes is divided into upper and lower semi-annular passages 4-1 and 4-2, which are independent of each other, for conveying the first and second oxidants, respectively. The first oxidant stream and the second oxidant stream are independent of each other and typically differ in composition. In some embodiments of the invention, the first oxidant is selected from oxygen, or a mixture of oxygen and air, preferably a mixture of oxygen and air. The second oxidant is selected from oxygen, or a mixture of oxygen and air, preferably oxygen.

The cross section of the inner tube is round, oval, square or irregular; the cross section of the outer tube is correspondingly round, oval, square or irregular; the front end of the bluff body is correspondingly round, oval, square or irregular.

As shown in fig. 3 and 7, the plurality of oxidant outlet passages 12 on the gun cap are also divided into upper first and lower second oxidant outlet passages 12-1 and 12-2, respectively, which are independent of each other, and the first and second oxidants flow out from the downstream ports of the upper first and lower second oxidant outlet passages, respectively, independently of each other. Also disposed within the gun cap is a separation stop 22 for separating the first and second oxidant streams.

In some embodiments, as shown in FIGS. 5, 6 and 7, the lower second oxidant outlet passage 12-2 is larger than the upper first oxidant outlet passage 12-1. In some preferred embodiments, the total flow rate of the lower second oxidant is greater than the total flow rate of the upper first oxidant.

In some embodiments, the lower second oxidant outlet passage cross-sectional area is greater than the upper first oxidant outlet passage cross-sectional area, in particular, it is preferred that the lower second oxidant outlet passage cross-sectional area is 1 to 8 times, more preferably 1.5 to 3 times, the upper first oxidant outlet passage cross-sectional area.

Preferably, a plurality of oxidant outlet channels on the gun cap are arranged in a rotating mode at different included angles of 0-15 degrees in the X/Y/Z axis direction relative to the axis center line direction of the fuel outlet channel to form a vortex flow field.

The oxidant pipeline surrounding the fuel flow pipeline outside the fuel outlet of the combustor is divided into an upper part and a lower part which are mutually independent, oxidant gas with the same or different components can be respectively introduced, air or oxygen-enriched gas can be introduced into the first oxidant pipeline on the upper part, air, oxygen-enriched gas or pure oxygen can be introduced into the second oxidant pipeline on the lower part, the components and the flow of the first oxidant and the second oxidant can be conveniently adjusted, and accordingly the local atmosphere of flame can be changed. The lower second oxidant, which may preferably be oxygen, is suitably regulated to prevent solid particles in the fuel stream from falling into the furnace, especially when used in a glass furnace, to prevent solid fuel from falling onto the glass surface.

According to another important aspect of the invention, as shown in fig. 4a and 4b, in some preferred embodiments of the invention, the bluff body comprises a passage 14 for the delivery of the third oxidant, the passage having an upstream inlet end which is an inlet for the third oxidant and a downstream outlet end which is an outlet for the third oxidant. In some embodiments of the invention, the third oxidant is selected from oxygen, or a mixture of oxygen and air. The three paths of oxidants are mutually independent before being sprayed out of the outlet and are not mixed.

The first oxidant is oxygen, air or oxygen-enriched air, and the second oxidant is oxygen, air or oxygen-enriched air; the third oxidant is oxygen, air or oxygen-enriched air. The oxidant can be normal temperature or heated at 5-700 deg.C. In some practices, the second oxidant stream is oxygen, the first oxidant stream is air or oxygen-enriched air, and the third oxidant stream is oxygen-enriched air of different oxygen concentrations, as the case may be.

as shown in fig. 2, the position-limiting structure 6 and the guiding structure 7 of the blunt body may be a bracket and a guide groove. In some preferred embodiments of the present invention, as shown in fig. 4a and 4b, the position of the blunt body may be adjusted online by pulling the long tube at the rear of the blunt body back and forth.

Preferably, the material of the blunt body is heat-resistant metal or heat-resistant ceramic that is heat-resistant at 700 ℃.

It is contemplated that the similarly effective bluff body leading end may take other shapes in addition to the representative configuration of fig. 3. These alternative shapes include, but are not limited to, conical and cylindrical. Regardless of the shape of the bluff body, the bluff body is required to be in a shape that allows the bluff body to be arranged in the inner tube and moved and fixed in the inner tube through the guide structure and the limiting structure.

In some embodiments, the distance between the front end surface of the bluff body near the outlet end and the front end surface of the outlet end of the gun cap is adjustable to be 0-1 times the diameter of the inner tube, more preferably 0-0.5 times the diameter of the inner tube.

The burner in some embodiments of the invention has a bluff body which can flexibly adjust the position, especially can adjust the position on line, and can change the direction, speed and distribution of fuel flow; the center of the bluff body can convey oxygen, oxygen-enriched air or other single component/mixed component gas (such as natural gas), the mixing position of the fuel flow and the oxidant flow can be adjusted, and the flame length, the flame area and the ignition point can be adjusted.

According to a further important aspect of the present invention, in some preferred embodiments of the present invention, a sleeve 16, which is axially movable along the gun body, is fitted to the downstream port of the gun cap and is fitted to the outside of the downstream end of the gun cap 10. Preferably, the distance between the plane of the gun cap downstream port and the plane of the sleeve one downstream port is adjustable from 0cm to 15 cm. In some embodiments of the present invention, the position of the first sleeve is controlled by a telescopic rod 17 fixed on the outer wall of the gun body, and the plane of the downstream port of the first sleeve can be equal to the plane of the downstream port of the gun cap, and the distance is 0 cm; the first sleeve can also extend out along the gun cap to the downstream end, and the distance between the plane of the downstream port of the first sleeve and the plane of the downstream port of the gun cap can be 15 cm.

The first sleeve with adjustable length is arranged at the gun head part of the combustor in the embodiment of the invention and can axially move along the gun body to adjust the mixing distance of the oxidant and the fuel, so that the mixing time and the mixing degree of the oxidant and the fuel are controlled.

The invention also relates to a furnace 18, as shown in fig. 9, comprising a furnace wall 20 defining a combustion chamber 19, at least one burner of any of the above mentioned types, said burner 21 being mounted in the furnace wall so that the downstream outlet face of the burner gun body faces the combustion chamber and so that the upstream inlet face of the burner gun body is accessible from outside the combustion chamber.

In some embodiments of the invention, the burner is mounted in the industrial furnace wall such that the downstream exit face of the burner gun body is recessed relative to an inner surface of the furnace wall facing the combustion chamber, thereby forming a wider pre-combustion section between the downstream exit face of the burner gun body and the inner surface of the furnace wall. Preferably, the furnace comprises at least one combustion port, and one or more burners positioned at an edge of the at least one combustion port.

In some embodiments of the invention, the use of the burner for combusting a solid fuel in a combustion chamber of a furnace to generate heat therein. Preferably, the solid fuel includes, but is not limited to, petroleum coke powder, coal powder, and biomass particles. The invention is particularly useful in furnaces for producing glass. In a regenerative glass melting furnace, such as that shown in FIG. 9, having one or more combustion ports, oxy-burners are positioned on opposite sides or ends of the furnace combustion chamber.

Example 1

One oxygen-rich solid fuel burner of the present invention as shown in fig. 2 is used as follows: the carrier (i.e., the air) of the solid fuel is air, carbon dioxide or a mixture of the air and the carbon dioxide or other gases (such as combustion exhaust gas discharged from a kiln). The conveying air can be normal temperature or heated at 10-45 deg.C. For solid fuel, the proportion coefficient of the conveying air is 40-60 standard cubic meters of air for 100Kg of fuel. In use, the solid fuel is mixed with the conveying air to form air-powder fuel flow, the air-powder fuel flow enters the combustor from the upstream inlet of the inner pipe, passes through the outlet of the inner pipe and the isolation sleeve and flows out from the downstream of the gun cap; the second oxidant flow is oxygen which flows in from an oxygen source through an upstream inlet of a lower semicircular ring part of the annular channel defined between the outer pipe and the inner pipe, flows out from a plurality of second oxidant outlet channels in the gun cap through the semicircular annular channel; the first oxidant flow is oxygen-enriched air, flows in from an air source through an upstream inlet of a semicircular ring part on an annular channel defined between the outer pipe and the inner pipe, flows out from a plurality of first oxidant outlet channels in the gun cap through the semicircular annular channel; the number of the first oxidant passages is 6, the number of the second oxidant passages is 7, and the outlet area of the second oxidant passages is 1.3 times that of the first oxidant passages; the bluff body 5 is positioned at the axial center of the inner tube, the outer diameter of the bluff body 5 is smaller than the inner diameter of the inner tube 3, and the effective sectional area of the bluff body is 60 percent of that of the inner tube; the distance between the front end surface of the blunt body close to the outlet end and the front end surface of the outlet end of the gun cap 10 has an adjusting range which is 0.3 times of the effective diameter of the inner tube. When the combustion is stopped, the air flows for cooling are respectively connected to the upper streams of the two independent oxidant pipelines, and the corresponding oxidant air sources are switched back according to the time sequence until the combustion program starts.

The burner of the present invention was subjected to a combustion simulation in a horseshoe flame glass kiln. The flow rate of combustion-supporting air is 13800m3/h, and the temperature is 1250 ℃; introducing an air/oxygen mixture at 35 ℃ into a first oxidant passage at the upper part of the burner, wherein the oxygen/air respectively accounts for 50 vol%; 36 cubic meters of oxygen is introduced into a second oxidant passage at the lower part of the combustor, and is 1.5 times of the total air quantity at the upper part; introducing a third oxidant which is air into the bluff body; the reference ratio of petroleum coke powder to air (air) is 1 kg: 0.5m 3; when the proportion among the fluids is changed, the shape of the blunt body, the cross section of the blunt body and the position of the blunt body relative to the gun head are adjusted, tests prove that the flame length can be adjusted, shortened, the rigidity is weakened, the oxidizing atmosphere at the lower part of the flame is enhanced, the local temperature at the bottom of the flame is increased, and the expected change is achieved.

FIG. 10a is a view of a conventional air-solid fuel burner with a fuel stream centered and an oxidant stream around the periphery of the fuel stream, the oxidant stream being emitted at the cap through a plurality of small orifices evenly distributed around the fuel stream outlet; FIG. 10b shows the solid fuel burner of FIG. 2, in the above state of the art, when the distance between the front end surface of the bluff body near the outlet end and the front end surface of the outlet end of the cap is adjusted from 0.5 to 0.2 times the diameter of the inner tube, the flame length is shortened and widened and the rigidity is reduced; the third oxidant increases to lead the ignition point to be advanced and accelerate the ignition speed, and the third oxidant flow in the center of the bluff body leads the ignition point to be closer to the burner; the second oxidant flow at the lower part of the burner can prevent incompletely combusted granular fuel from falling into molten glass; the invention can realize the ideal U-shaped flame of the horseshoe flame kiln, and has the following advantages:

1. The temperature of the lower part of the flame is raised, the heating and heat transfer capacity of the glass material is increased, the melting speed is accelerated, the material mountain is shortened, the temperature of the pool bottom is raised, the temperature of the arch top of the feeding end is stable, and the temperature of the arch top from the middle part of the pool furnace to the direction of the throat is reduced.

2. Adjusting the length of the flame, the coverage surface of the flame and the rigidity of the flame; the protection of the part with serious erosion of the refractory material of the local tank furnace is realized.

3. The flame stability is enhanced, the foam layer becomes thinner and shorter, and the glass liquid mirror surface in the clarification area is enlarged and brighter.

4. Improve the quality of the glass (bubbles and chromatic aberration) and reduce the negative effect of the inherent characteristics of the petroleum coke powder on the quality of the glass.

5. And (3) reducing the exhaust emission: under the condition of oxygen enrichment with total oxygen content of 28.5 vol% of oxidant, compared with a common air-solid fuel burner, the emission of exhaust gas is reduced by 12%.

Hereinbefore, preferred embodiments of the present invention have been described. It is however obvious to a person skilled in the art that many modifications may be made to the described embodiments without departing from the basic idea of the invention.

In general, all of the embodiments described above are combinable, if applicable. Furthermore, the burner and the industrial furnace may also contain more details than shown in the figures.

It will be appreciated that there are many more possible combinations between the various embodiments described above that may be used for a particular application. The invention is therefore not limited to the embodiments described but may be varied within the full scope of the appended claims.

Claims (26)

1. An adjustable flame oxycombustion burner comprising:

A burner lance, wherein the burner lance comprises an inner tube disposed within an outer tube, and an outer tube defining an annular passage therebetween for conveying a stream of oxidant, the downstream ports of the inner and outer tubes together defining a lance tip mounting location thereof;

A position-adjustable blunt body arranged in the inner tube, wherein a limit structure and a guide structure which are matched with each other are respectively arranged on the blunt body and the inner wall of the inner tube, and a channel defined between the inner tube and the blunt body is used for conveying fuel flow;

The upstream port of the isolation sleeve is sleeved on the downstream port of the inner pipe, and the inner diameter of the isolation sleeve is smaller than or equal to that of the inner pipe;

The gun cap is sleeved on the outer pipe of the burner gun body and fixedly connected to the gun head mounting part of the burner gun body, the gun cap comprises a fuel outlet channel and a plurality of oxidant outlet channels, the fuel outlet channel is located at the axial center of the gun cap, the downstream port of the isolation sleeve is clamped and sleeved on the downstream port of the fuel outlet channel of the gun cap, the oxidant outlet channels surround the periphery of the fuel outlet channels, oxidant flows to the oxidant outlet channels through channels defined by the inner side wall of the gun cap and the outer wall of the isolation sleeve, fuel flows out of the fuel outlet channels of the gun cap through the isolation sleeve, and the fuel flows and the oxidant flows are independent before flowing out of the fuel outlet channels and the oxidant outlet channels of the gun cap.

2. An adjustable flame oxycombustion device according to claim 1, wherein the annular channel defined between the outer tube and the inner tube is divided into two upper and lower semi-annular channels independent of each other for feeding the first oxidant and the second oxidant, respectively.

3. The adjustable flame oxycombustion of claim 2, wherein the plurality of oxidant outlet passages on the lance cap are also divided into upper first and lower second oxidant outlet passages that are independent of each other, respectively, the first and second oxidants flowing out of the downstream ports of the upper first and lower second oxidant outlet passages, respectively, independent of each other.

4. The adjustable flame oxycombustion of claim 3, wherein there are more lower second oxidant outlet passages than upper first oxidant outlet passages.

5. The adjustable flame oxycombustion of claim 3, wherein the total flow of the lower second oxidant is greater than the total flow of the upper first oxidant.

6. An adjustable flame oxycombustion according to claim 3, wherein the lower second oxidant outlet passage cross-sectional area is greater than the upper first oxidant outlet passage cross-sectional area, the lower second oxidant outlet passage cross-sectional area being 1-8 times the upper first oxidant outlet passage cross-sectional area.

7. An adjustable flame oxycombustion according to claim 6, wherein the lower second oxidant outlet passage cross-sectional area is 1.5 to 3 times the upper first oxidant outlet passage cross-sectional area.

8. An adjustable flame oxycombustion device according to claim 3, wherein the oxidant outlet channels are arranged at different included angles of 0-15 degrees in the X/Y/Z direction relative to the axis center line direction of the fuel outlet channel to form a vortex flow field.

9. An adjustable flame oxycombustion device according to claim 1, wherein the bluff body comprises a passage for conveying a third oxidant, the passage having an upstream inlet end for the third oxidant and a downstream outlet end for the third oxidant at the front end of the bluff body.

10. An adjustable flame oxycombustion device according to claim 1, wherein the position limiting structure and the guiding structure of the bluff body are brackets and guiding grooves.

11. An adjustable flame oxycombustion burner according to claim 1, wherein the position of the bluff body is adjustable on-line.

12. An adjustable flame oxycombustion device according to claim 1, wherein the front end of the bluff body has a cross-sectional area of more than 50% of the cross-sectional area of the inner tube, and the front end of the bluff body has a cross-sectional area of 55% -75% of the cross-sectional area of the inner tube.

13. An adjustable flame oxycombustion device according to claim 1, wherein the distance between the front end surface of the bluff body near the outlet end and the front end surface of the outlet end of the cap is adjustable to 0-1 times the diameter of the inner tube, which is 0-0.5 times the diameter of the inner tube.

14. an adjustable flame oxycombustion burner according to claim 1, wherein the material of the bluff body is a heat-resistant metal or a heat-resistant ceramic.

15. The adjustable flame oxycombustion of claim 1, wherein the forward end of the bluff body proximate the lance tip is cylindrical or conical.

16. An adjustable flame oxycombustion burner according to claim 2, wherein the first oxidant is selected from oxygen, or a mixture of oxygen and air.

17. An adjustable flame oxycombustion burner according to claim 2, wherein the second oxidant is selected from oxygen, or a mixture of oxygen and air.

18. An adjustable flame oxycombustion burner according to claim 9, wherein the third oxidant is selected from oxygen, or a mixture of oxygen and air.

19. An adjustable flame oxycombustion device according to claim 1, wherein a first sleeve axially movable along the lance body is fitted to the downstream port of the lance cap.

20. An adjustable flame oxycombustion burner according to claim 19, wherein the distance of the lance cap downstream port plane from the sleeve one downstream port plane is adjustable from 0-15 cm.

21. An adjustable flame oxycombustion device according to claim 19, wherein the sleeve is positioned by a telescoping rod fixed to the outer wall of the lance.

22. A flame adjustable oxycombustion burner according to claim 1, characterized by the use of the burner for burning solid fuel in the combustion chamber of an industrial furnace for generating heat therein.

23. An adjustable flame oxycombustion burner according to claim 22, wherein the solid fuel includes but is not limited to petroleum coke fines, coal fines, biomass particles.

24. An industrial furnace comprising a furnace wall defining a combustion chamber, at least one adjustable flame oxycombustion burner according to any one of claims 1 to 19 mounted in the furnace wall such that a downstream outlet face of the burner lance faces the combustion chamber and such that an upstream inlet face of the burner lance is accessible from outside the combustion chamber.

25. The industrial furnace of claim 24, wherein the burner is mounted in the furnace wall such that a downstream exit face of the burner gun body is recessed relative to a surface of the furnace wall facing the combustion chamber, thereby forming a wider pre-combustion section between the downstream exit face of the burner gun body and the surface of the furnace wall.

26. The industrial furnace of claim 24, comprising at least one combustion port, and one or more burners positioned at an edge of the at least one combustion port.