CN104373935A - Powdered coal combustor for entrained-flow bed gasification furnace - Google Patents
Powdered coal combustor for entrained-flow bed gasification furnace Download PDFInfo
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- CN104373935A CN104373935A CN201410531367.6A CN201410531367A CN104373935A CN 104373935 A CN104373935 A CN 104373935A CN 201410531367 A CN201410531367 A CN 201410531367A CN 104373935 A CN104373935 A CN 104373935A
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- central tube
- tube
- fine coal
- shower nozzle
- angle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D1/00—Burners for combustion of pulverulent fuel
- F23D1/02—Vortex burners, e.g. for cyclone-type combustion apparatus
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/46—Gasification of granular or pulverulent flues in suspension
- C10J3/48—Apparatus; Plants
- C10J3/485—Entrained flow gasifiers
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/46—Gasification of granular or pulverulent flues in suspension
- C10J3/48—Apparatus; Plants
- C10J3/50—Fuel charging devices
- C10J3/506—Fuel charging devices for entrained flow gasifiers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2201/00—Burners adapted for particulate solid or pulverulent fuels
- F23D2201/20—Fuel flow guiding devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2214/00—Cooling
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
The invention provides a powdered coal combustor for an entrained-flow bed gasification furnace. The powdered coal combustor comprises a central pipe and a peripheral pipe concentrically surrounding the central pipe. The cross section of a central pipe spray nozzle straight section is a sharp acute angle, two sides (namely the central pipe spray nozzle straight section and a central pipe spray nozzle outer-side slanted side corresponding to the straight section) of the acute angle are larger in length, guide pieces are arranged above the central pipe spray nozzle straight section, and a spiral guide chamber is arranged on a powdered coal channel defined by the central pipe and the peripheral pipe. The powdered coal combustor can effectively reduce the high-temperature radiation area and strength at the position of a central pipe spray nozzle, the service life of the powdered coal combustor can be prolonged, dismounting and maintenance of the spray nozzle are facilitated, the effect of mixing powdered coal and an oxidizing agent can be improved, the long-period stable operation of powdered coal gasification is achieved, and the cost for powdered coal gasification can be reduced.
Description
Technical field
The invention belongs to coal gasification field, especially relate to a kind of powdered coal burner for airflow bed gasification furnace.
Background technology
Rich coal resources in China, oil, natural gas resource are relatively poor, and the proportion that coal accounts for total energy consumption is about 70%, account for 50% of worldwide coal total quantity consumed.Traditional coal utilization mode is directly burning, and not only efficiency is low, and seriously polluted, causes China's sulfur dioxide, nitrogen oxide, Mercury In The Air discharge capacity to be in the whole world the first.Coal gasification is the important channel of clean coal utilization, and this technology has adapted to the sustainable development requirement of China's economy, and development in recent years is rapid.Solid coal is become gaseous hydrocarbon, CO, H by Coal Gasification Technology exactly
2deng the technology of gas, its object obtains clean energy resource and industrial chemicals exactly.Its principle is exactly coal, coal tar or petroleum coke and gasifying agent (air, oxygen, steam, hydrogen etc.) issue biochemical reaction in uniform temperature and pressure, is coal gas by the organic matter transformation in coal, coal tar or petroleum coke.Air-flow bed coal-gasification technique can be divided into coal water slurry gasification and coal gasification again.The combustion medium of coal water slurry gasification burner used is the coal slurry containing about 40% moisture, and the combustion medium of coal gasification burner used is density is the solid coal dust of about 300kg/Nm3, the viscosity property, flow behavior, density, granularity, transporting velocity etc. of two kinds of combustion mediums are all not identical.Therefore, not identical to the requirement of the equipment for gasification such as gasification furnace, burner yet.Especially for all the more so burner.Gasified raw material sprays to enter in gasification furnace through the burner be arranged on gasification furnace and burns.Wherein, the charging of water coal slurry burner is gas-liquid mixing, and the charging of powdered coal burner is gas-solid mixing, and mechanism of mass transfer, kinetics differ greatly, and the design of burner also emphasizes particularly on different fields.
Coal gasification has compared with coal water slurry gasification that gasification efficiency is high, good performance indexes, feature that application coal is wide, has higher Technological Economy and environment-friendly advantage.In fine coal gasification process, powdered coal burner is the nucleus equipment of gasification furnace, and it is expensive, and maintenance, replacement cost is high, larger to the economic influence of gasifier operation.But because burner is placed in gasification furnace, work under bad environment, its life-span is general shorter, generally at about 3 months.Therefore, the key of gasification installation long-term operation has been become the service life of powdered coal burner.Position ablation the most easily occurring due to powdered coal burner is the counter-fire face of burner, and Ablation cause is mainly from the hyperthermia radiation in gasification furnace or the direct calcination of flame.
In order to the destructiveness of the hyperthermia radiation or flame calcination that reduce burner side towards the fire, many technology are developed.Such as, ceramic powder sprays on the outer surface of gasification furnace burner by CN1300870A, for isolated high temperature corrosion medium.CN101956982A opens multiple micro through-hole on burner is heated annular panel, and cooling water is sprayed by these through holes and is subject to thermal evaporation, consumes the heat of high temperature for burner radiation of gasification furnace thus.CN103333717A adopts and arranges the thermal insulation layer of refractoriness more than 1770 DEG C to stop the hyperthermia radiation in gasification furnace at the front end face of burner.More common cool-down method is arranging multiple cooling water jecket exactly between each material channel, is used for improving the cooling effect at shower nozzle position, such as, described in CN10403496A, CN101446413A.These cooling measures alleviate the destructiveness of burner most external material channel side towards the fire to a certain extent above, but for the part between oxygen agent passage and coal dust channel, its high temperature problem does not have clear improvement, main cause is that oxidant is after going out burner channel, pyroreaction is there is rapidly with the fuel gas in stove, high-temperature region is formed at burner head, thus the hyperthermia radiation accelerated between oxidant and coal dust channel or high temperature sintering.In order to extend the service life at this position, usually cooling water jecket is set between the two channels.By the forced circulation of chuck inner cooling water, remove thermic load rapidly, thus play the object of cooling surface temperature.In fact the setting of water leg also can bring two other defect.One is that water leg self exists certain heating surface area, while removing thermic load, this heating surface area is also accepting heat radiation, and become the position that burner side towards the fire is the most easily subject to high temperature, after burner of being everlasting runs a period of time, surface just cracks and drainage occurs.Two is that the maintenance of water leg structure and dismounting are relatively difficult, needs the maintaining unit of specialty to carry out dismounting and maintenance, costly.
In addition, in order to realize the good mixing of fine coal and oxidant, mostly prior art is designing swirl vane near coal dust channel exit and oxidant channel exit, and the mixed effect of this swirl vane to material is not good enough.And swirl vane is flatly welded on the tube wall of material channel, is subject to again the impact of high-velocity stream while subject self gravitation, in actual moving process, often there is spinning disk obscission.
Summary of the invention
The object of this invention is to provide a kind of can alleviate materials inside channel outlet high temperature failure, dismounting and the respond well powdered coal burner for powder coal gasification furnace of easy to maintenance, each mixing of materials.
Technical scheme of the present invention is: a kind of powdered coal burner for airflow bed gasification furnace, comprise central tube 1 and surround the peripheral tube 2 of this central tube with one heart, central tube 1 and peripheral tube 2 conically shrink in the side near side towards the fire, central tube 1 is oxidant channel, the circular passage that central tube 1 outer wall and peripheral tube 2 inwall are formed is fine coal passage, peripheral tube 2 is double-deck cooling water jecket, first cooling water enters chuck internal layer by cooling water inlet 13, and the slype by peripheral tube 2 shower nozzle position to enter outside chuck and flowed out by coolant outlet 14.Wherein, the interior contraction half-angle α of central tube 1 shower nozzle is 10 ° ~ 20 °, and outside angle of inclination beta is 70 ° ~ 80 °, and the interior contraction half-angle ε of peripheral tube 2 shower nozzle is 15 ° ~ 25 °, central tube 1 shower nozzle straight section height h
1be h with the ratio of central tube 1 nozzle diameter d
1: d=0.5 ~ 2, the distance h of central tube 1 and peripheral tube 2 vents face
2be h with the ratio of central tube 1 nozzle diameter d
2: d=0.1 ~ 0.5.
Preferably jet size is: the interior contraction half-angle α of central tube 1 shower nozzle is 15 °, and outside angle of inclination beta is 75 °, and the interior contraction half-angle ε of peripheral tube 2 shower nozzle is 20 °, central tube 1 shower nozzle straight section height h
1be h with the ratio of central tube 1 nozzle diameter d
1: d=1, the distance h of central tube 1 and peripheral tube 2 vents face
2be h with the ratio of central tube 1 nozzle diameter d
2: d=0.2.This preferred version can reduce the scaling loss risk of mesotube shower nozzle largely.Also find, this preferred version can also improve the Flow Field Distribution of gasification furnace simultaneously, forms the dross that gasification furnace furnace wall is good, improves carbon conversion efficiency, and greatly can improve the operating load of gasification furnace.
The outside angle of inclination beta of powdered coal burner central tube 1 shower nozzle of the present invention is comparatively large, central tube 1 shower nozzle straight section height h
1also higher with the ratio of central tube 1 nozzle diameter d, form sharp-pointed acute angle cross section thus, and two of this acute angle limits (i.e. outside central tube 1 shower nozzle of central tube 1 shower nozzle straight section and its correspondence inclined side) length is larger.This design makes the area contraction of the side towards the fire of central tube 1 into a line on the one hand, reduces shower nozzle heating surface area foremost; On the other hand, because the heat radiation of side towards the fire falls sharply in gradient, the thermal exposure that outside central tube 1 shower nozzle, inclined side is subject to also reduces greatly.In prior art, mostly the improvement of the cooling measure of powdered coal burner central tube, be that the structure concentrating on improvement cooling water jecket is to improve cooling effect, and generally believe the easier scaling loss of this center tube structure not with cooling water jecket of the present invention.But find in actual production, remove cooling jacket, by changing the design size of central tube shower nozzle, making its cross section be sharp-pointed acute angle and after this acute angle has the longer length of side, being not easily burnt on the contrary, longer service life, running more stable.Reason be design of the present invention reduce greatly total heating surface amass.In addition; improved burner structure acutangulates due to outlet, thus decreases backflowing of oxidant, makes fine coal channel outlet form stable coal dust and inert gas cover; decrease the radiation intensity to burner head, effectively protect the head of burner.Meanwhile, after removing cooling water jecket, the easier dismounting of central tube; Burner head is removable parts, just cuts away burner head during maintenance, can keep in repair more easily after removing water leg.
In the present invention, the distance h of central tube 1 and peripheral tube 2 vents face
2be h with the ratio of central tube 1 nozzle diameter d
2: d=0.1 ~ 0.5.Because the heat radiation of nozzle position falls sharply in gradient, therefore central tube 1 vents face shrinks and enters peripheral tube 2 vents face inside, is conducive to reducing heat radiation further.Meanwhile, again due to h
2cross the mixed effect of conference ectocrine material, therefore h
2with the ratio of d no more than 0.5.
The interior contraction half-angle α of central tube 1 shower nozzle is 10 ° ~ 20 °; simultaneously; the interior contraction half-angle ε of peripheral tube 2 shower nozzle is 15 ° ~ 25 °; this design can make from fine coal passage ejection carrier gas and fine coal form an air-flow protection layer; heat radiation in central tube shower nozzle and gasification furnace can be isolated by this protective layer to a certain extent, realizes the further protection to central tube shower nozzle thus.
Further, internal face above powdered coal burner central tube 1 shower nozzle straight section of the present invention is arranged some equally distributed flow deflectors 3 on same circumference, described flow deflector 3 is in a certain angle with the axis of central tube 1, this design can accelerate the oxidant flow velocity of central tube 1 nozzle, thus accelerate the heat taking away central tube shower nozzle place, the mixed effect of oxidant and fine coal can be strengthened simultaneously.Namely prior art is usually carried on the back fiery face and is arranged swirl vane above the shower nozzle of oxidant channel, and swirl vane is flatly welded on the tube wall of oxidant channel, is subject to again the impact of high-velocity stream while subject self gravitation, likely causes coming off.The alternative swirl vane of flow deflector 3 on central tube straight section of the present invention, overcomes the deficiency of existing swirl vane, while giving the cooling of central tube shower nozzle, realize good mixed function.
Described flow deflector 3 is 15 ° ~ 35 ° with the axial angle theta of central tube 1, is preferably 20 °.
Further, fine coal import 11 is arranged on fine coal passage with the axis of powdered coal burner at an angle, communicated with the axial parallel fine coal carrier pipe 5 of central tube 1 with 2 to 4 by distributor 12, described 2 to 4 fine coal carrier pipes 5 are evenly distributed in fine coal passage, and the cross-sectional area summation of these fine coal passages corresponds to the cross-sectional area of fine coal import 11, fine coal carrier pipe 5 bottom arranges spirality diversion chamber 4, fine coal carrier pipe 5 communicates with spirality diversion chamber 4, described spirality diversion chamber 4 is by a top spiral rectangular tube 6, article one, the contact pin 8 that lower part helical rectangular tube 7 is connected two spiral rectangular tubes with one surrounds, one end of described contact pin 8 is connected to the shortest fine coal carrier pipe exit, the other end connects with lower part helical rectangular tube 7, article two, spiral rectangular tube 6 and 7 extends in parallel, and be 20 ~ 45 ° with the axial angle γ of fine coal carrier pipe 5, contact pin 8 is 10 ~ 30 ° with the axial angle δ of fine coal carrier pipe 5, spiral rectangular tube 6, the hand of spiral of spiral rectangular tube 7 and contact pin 8 is identical with the hand of spiral of the flow deflector 3 above central tube 1 shower nozzle straight section.
Powdered coal burner of the present invention can be used in multi-jet fine coal airflow bed gasification furnace.Such as, be provided with 3-6 powdered coal burner of the present invention at top of gasification furnace, described powdered coal burner is evenly distributed and in the axis being parallel of gasification furnace on a circumference, the circle centre position mounting points ignition combustor of described powdered coal burner place circumference.
Flow deflector 3 in central tube 1 and spirality diversion chamber 4 acting in conjunction in fine coal passage; the coal dust that the oxidant that central tube 1 is sprayed and fine coal passage spray and inert gas define good mixing; and central tube 1 nozzle; oxidant is wrapped up by coal dust and inert gas, and the head effectively protecting burner can not be ablated.
Central tube 1 is not had the structure of water leg by one aspect of the present invention instead, and the orifice design of central tube 1 is become sharp-pointed acute angle, is subject to the area of hyperthermia radiation, increases the stability of coal dust and inert gas cover in order to reduce central tube 1 spout; On the other hand, flow deflector 3 and spirality diversion chamber 4 are set, work in coordination with and add water conservancy diversion effect.The stability of its external inert gas protective layer of further enhancing.
The hyperthermia radiation area and intensity at central tube shower nozzle place effectively can be reduced by said structure design, extend its service life, facilitate dismounting and the maintenance of nozzle, improve the mixed effect of fine coal and oxidant, realize the long-period stable operation of coal gasification, reduce the cost of coal gasification.
Accompanying drawing explanation
Fig. 1 is the structural representation of powdered coal burner of the present invention
Fig. 2 is powdered coal burner shower nozzle profile in Fig. 1
Fig. 3 is powdered coal burner central tube inwall flow deflector distribution schematic diagram of the present invention
Fig. 4 is the distribution schematic cross-section of fine coal passage containing fine coal carrier pipe during 2 fine coal carrier pipes
Fig. 5 is the distribution schematic cross-section of fine coal passage containing fine coal carrier pipe during 3 fine coal carrier pipes
Fig. 6 is the partial cross-section cloth schematic diagram of fine coal passage containing fine coal carrier pipe during 4 fine coal carrier pipes
Fig. 7 is the structural representation of spirality diversion chamber in powdered coal burner fine coal passage of the present invention
The expanded view of Tu8Shi Tu7Zhong spirality diversion chamber
Fig. 9 is the burner distribution schematic diagram of the gasification furnace roof applying powdered coal burner of the present invention
In figure:
1, central tube 2, peripheral tube 3, central tube 1 flow deflector
4, spirality diversion chamber 5, fine coal carrier pipe 6, top spiral coil
7, lower part helical coil pipe 8, contact pin 9, powdered coal burner
10, start-up burner 11, fine coal import 12, distributor
13, cooling water inlet 14, coolant outlet
Detailed description of the invention
Embodiment 1
A preferred version of powdered coal burner of the present invention is shown in Fig. 1, comprise central tube 1 and surround the peripheral tube 2 of this central tube with one heart, central tube 1 and peripheral tube 2 conically shrink in the side near side towards the fire, central tube 1 is oxidant channel, the circular passage that central tube 1 outer wall and peripheral tube 2 inwall are formed is fine coal passage, peripheral tube 2 is double-deck cooling water jecket, first cooling water enters chuck internal layer by cooling water inlet 13, and the slype by peripheral tube 2 shower nozzle position to enter outside chuck and flowed out by coolant outlet 14.Fig. 2 is powdered coal burner shower nozzle profile in Fig. 1, and wherein, the interior contraction half-angle α of central tube 1 shower nozzle is 10 °, and outside angle of inclination beta is 70 °, and the interior contraction half-angle ε of peripheral tube 2 shower nozzle is 15 °, central tube 1 shower nozzle straight section height h
1be h with the ratio of central tube 1 nozzle diameter d
1: d=0.5, the distance h of central tube 1 and peripheral tube 2 vents face
2be h with the ratio of central tube 1 nozzle diameter d
2: d=0.1.
Embodiment 2
Another preferred version of powdered coal burner of the present invention is, powdered coal burner comprises central tube 1 and surrounds the peripheral tube 2 of this central tube with one heart, central tube 1 and peripheral tube 2 conically shrink in the side near side towards the fire, central tube 1 is oxidant channel, the circular passage that central tube 1 outer wall and peripheral tube 2 inwall are formed is fine coal passage, peripheral tube 2 is double-deck cooling water jecket, first cooling water enters chuck internal layer by cooling water inlet 13, and the slype by peripheral tube 2 shower nozzle position to enter outside chuck and flowed out by coolant outlet 14.Wherein, the interior contraction half-angle α of central tube 1 shower nozzle is 20 °, and outside angle of inclination beta is 80 °, and the interior contraction half-angle ε of peripheral tube 2 shower nozzle is 25 °, central tube 1 shower nozzle straight section height h
1be h with the ratio of central tube 1 nozzle diameter d
1: d=2, the distance h of central tube 1 and peripheral tube 2 vents face
2be h with the ratio of central tube 1 nozzle diameter d
2: d=0.5.
Embodiment 3
Another preferred version of powdered coal burner of the present invention is, powdered coal burner comprises central tube 1 and surrounds the peripheral tube 2 of this central tube with one heart, central tube 1 and peripheral tube 2 conically shrink in the side near side towards the fire, central tube 1 is oxidant channel, the circular passage that central tube 1 outer wall and peripheral tube 2 inwall are formed is fine coal passage, peripheral tube 2 is double-deck cooling water jecket, first cooling water enters chuck internal layer by cooling water inlet 13, and the slype by peripheral tube 2 shower nozzle position to enter outside chuck and flowed out by coolant outlet 14.Wherein, the interior contraction half-angle α of central tube 1 shower nozzle is 15 °, and outside angle of inclination beta is 75 °, and the interior contraction half-angle ε of peripheral tube 2 shower nozzle is 20 °, central tube 1 shower nozzle straight section height h
1be h with the ratio of central tube 1 nozzle diameter d
1: d=1, the distance h of central tube 1 and peripheral tube 2 vents face
2be h with the ratio of central tube 1 nozzle diameter d
2: d=0.2.
Comparative example 1
A contrast scheme of powdered coal burner of the present invention is, in the powdered coal burner dimensional parameters of contrast scheme, the outside angle of inclination beta of central tube 1 shower nozzle is 85 °, and other parameter is in the same manner as in Example 3.
Comparative example 2
Another contrast scheme of powdered coal burner of the present invention is, in the powdered coal burner dimensional parameters of contrast scheme, the outside angle of inclination beta of central tube 1 shower nozzle is 60 °, and other parameter is in the same manner as in Example 3.
Comparative example 3
Another contrast scheme of powdered coal burner of the present invention is, in the powdered coal burner dimensional parameters of contrast scheme, the outside angle of inclination beta of central tube 1 shower nozzle is 50 °, and other parameter is in the same manner as in Example 3.
Embodiment 4
The cycle of operation contrast of each burner in embodiment 1 to 3 and comparative example 1 to 3.With oxygen (purity is for 99.6%) for oxidant, nitrogen is fine coal carrier gas, and carrier gas fine coal flow velocity is 8m/s.The effect assessment run after some cycles sees the following form:
Embodiment 5
Another preferred version of powdered coal burner of the present invention is, powdered coal burner comprises central tube 1 and surrounds the peripheral tube 2 of this central tube with one heart, central tube 1 and peripheral tube 2 conically shrink in the side near side towards the fire, central tube 1 is oxidant channel, the circular passage that central tube 1 outer wall and peripheral tube 2 inwall are formed is fine coal passage, peripheral tube 2 is double-deck cooling water jecket, first cooling water enters chuck internal layer by cooling water inlet 13, and the slype by peripheral tube 2 shower nozzle position to enter outside chuck and flowed out by coolant outlet 14.Wherein, the interior contraction half-angle α of central tube 1 shower nozzle is 15 °, and outside angle of inclination beta is 75 °, and the interior contraction half-angle ε of peripheral tube 2 shower nozzle is 20 °, central tube 1 shower nozzle straight section height h
1be h with the ratio of central tube 1 nozzle diameter d
1: d=1, the distance h of central tube 1 and peripheral tube 2 vents face
2be h with the ratio of central tube 1 nozzle diameter d
2: d=0.2.
Internal face above described central tube 1 shower nozzle straight section is arranged some equally distributed flow deflectors 3 on same circumference, the structure of flow deflector is shown in Fig. 3.Described flow deflector 3 is 20 ° with the axial angle theta of central tube 1.
Embodiment 6
Another preferred version of powdered coal burner of the present invention is, powdered coal burner comprises central tube 1 and surrounds the peripheral tube 2 of this central tube with one heart, central tube 1 and peripheral tube 2 conically shrink in the side near side towards the fire, central tube 1 is oxidant channel, the circular passage that central tube 1 outer wall and peripheral tube 2 inwall are formed is fine coal passage, peripheral tube 2 is double-deck cooling water jecket, first cooling water enters chuck internal layer by cooling water inlet 13, and the slype by peripheral tube 2 shower nozzle position to enter outside chuck and flowed out by coolant outlet 14.Wherein, the interior contraction half-angle α of central tube 1 shower nozzle is 15 °, and outside angle of inclination beta is 75 °, and the interior contraction half-angle ε of peripheral tube 2 shower nozzle is 20 °, central tube 1 shower nozzle straight section height h
1be h with the ratio of central tube 1 nozzle diameter d
1: d=1, the distance h of central tube 1 and peripheral tube 2 vents face
2be h with the ratio of central tube 1 nozzle diameter d
2: d=0.2.
Internal face above described central tube 1 shower nozzle straight section is arranged some equally distributed flow deflectors 3 on same circumference, the structure of flow deflector is shown in Fig. 3.Described flow deflector 3 is 20 ° with the axial angle of central tube 1.
Fine coal import 11 is arranged on fine coal passage with the axis of powdered coal burner at an angle, communicated with the axial parallel fine coal carrier pipe 5 of central tube 1 with 3 by distributor 12, described 3 fine coal carrier pipes 5 are circumferentially evenly distributed in fine coal passage same, and the cross-sectional distribution figure of 3 fine coal carrier pipes is shown in Fig. 5.
Fine coal carrier pipe 5 bottom arranges spirality diversion chamber 4, and fine coal carrier pipe 5 communicates with spirality diversion chamber 4.The structure of fine coal carrier pipe 5 and spirality diversion chamber 4 is shown in Fig. 7, and the expanded view of spirality diversion chamber 4 is shown in Fig. 8.
Described spirality diversion chamber 4 to be connected two spiral rectangular tubes by a top spiral rectangular tube 6, lower part helical rectangular tube 7 contact pin 8 with one surrounds, one end of described contact pin 8 is connected to the shortest fine coal carrier pipe exit, the other end connects with lower part helical rectangular tube 7, article two, spiral rectangular tube 6 and 7 extends in parallel, and be 40 ° with the axial angle γ of fine coal carrier pipe 5, contact pin 8 is 20 ° with the axial angle δ of fine coal carrier pipe 5.The hand of spiral of spiral rectangular tube 6, spiral rectangular tube 7 and contact pin 8 is identical with the hand of spiral of the flow deflector 3 above central tube 1 shower nozzle straight section.
In this embodiment, fine coal carrier pipe also can be arranged to 2 or 4, and its cross-sectional distribution figure is shown in Fig. 4 and Fig. 6 respectively.
Embodiment 7
Fig. 9 is the burner distribution map of the gasification furnace roof applying powdered coal burner of the present invention.Be provided with three powdered coal burners 9 of the present invention at top of gasification furnace, described three powdered coal burners 9 are evenly distributed and in the axis being parallel of gasification furnace on a circumference, the circle centre position mounting points ignition combustor 10 of described three powdered coal burner place circumference.
Although the foregoing describe preferred version of the present invention, it will be understood by those of skill in the art that this only illustrates, protection scope of the present invention is defined by the appended claims.Those skilled in the art, under the prerequisite not deviating from principle of the present invention and essence, can make various changes or modifications to these embodiments, but these change and amendment all falls into protection scope of the present invention.
Claims (10)
1. the powdered coal burner for airflow bed gasification furnace, comprise central tube (1) and surround the peripheral tube (2) of this central tube with one heart, central tube (1) and peripheral tube (2) conically shrink in the side near side towards the fire, peripheral tube (2) is double-deck cooling water jecket, first cooling water enters chuck internal layer by cooling water inlet (13), slype by peripheral tube (2) shower nozzle position to enter outside chuck and is flowed out by coolant outlet (14), it is characterized in that: the interior contraction half-angle α of central tube (1) shower nozzle is 10 ° ~ 20 °, outside angle of inclination beta is 70 ° ~ 80 °, the interior contraction half-angle ε of peripheral tube (2) shower nozzle is 15 ° ~ 25 °, central tube (1) shower nozzle straight section height h
1be h with the ratio of central tube (1) nozzle diameter d
1: d=0.5 ~ 2, the distance h of central tube (1) and peripheral tube (2) vents face
2be h with the ratio of central tube (1) nozzle diameter d
2: d=0.1 ~ 0.5.
2. the powdered coal burner for airflow bed gasification furnace according to claim 1, it is characterized in that: the interior contraction half-angle α of central tube (1) shower nozzle is 15 °, outside angle of inclination beta is 75 °, the interior contraction half-angle ε of peripheral tube (2) shower nozzle is 20 °, central tube (1) shower nozzle straight section height h
1be h with the ratio of central tube (1) nozzle diameter d
1: d=1, the distance h of central tube (1) and peripheral tube (2) vents face
2be h with the ratio of central tube (1) nozzle diameter d
2: d=0.2.
3. the powdered coal burner for airflow bed gasification furnace according to claim 1, it is characterized in that: the internal face above described central tube (1) shower nozzle straight section is arranged some equally distributed flow deflectors (3) on same circumference, described flow deflector (3) is in a certain angle with the axis of central tube (1).
4. the powdered coal burner for airflow bed gasification furnace according to claim 3, is characterized in that: described flow deflector (3) and central tube (1) axial angle are 15 ° ~ 35 °.
5. the powdered coal burner for airflow bed gasification furnace according to claim 4, is characterized in that: described flow deflector (3) and central tube (1) axial angle theta are 20 °.
6. the powdered coal burner θ for airflow bed gasification furnace according to claim 5, it is characterized in that: fine coal import (11) is arranged on fine coal passage with the axis of powdered coal burner at an angle, communicated with the axial parallel fine coal carrier pipe (5) of central tube (1) with 2 to 4 by distributor (12), described 2 to 4 fine coal carrier pipes (5) are evenly distributed in fine coal passage, fine coal carrier pipe (5) bottom arranges spirality diversion chamber (4), fine coal carrier pipe (5) communicates with spirality diversion chamber (4), described spirality diversion chamber (4) is by top spiral rectangular tube (6), article one, the contact pin (8) that lower part helical rectangular tube (7) is connected two spiral rectangular tubes with one surrounds, one end of described contact pin (8) is connected to the shortest fine coal carrier pipe exit, the other end connects with lower part helical rectangular tube (7), article two, spiral rectangular tube (6) and (7) extend in parallel, and be 20 ~ 45 ° with the axial angle γ of fine coal carrier pipe (5), contact pin (8) is 10 ~ 30 ° with the axial angle δ of fine coal carrier pipe (5), spiral rectangular tube (6), the hand of spiral of spiral rectangular tube (7) and contact pin (8) is identical with the hand of spiral of the flow deflector (3) above central tube (1) shower nozzle straight section.
7. the powdered coal burner for fine coal airflow bed gasification furnace according to claim 6, it is characterized in that: two spiral rectangular tubes (6) and (7) are 40 ° with the axial angle γ of fine coal carrier pipe (5), and contact pin (8) is 20 ° with the axial angle δ of fine coal carrier pipe (5).
8. one kind is provided with the airflow bed gasification furnace of the powdered coal burner described in claim 1 to 7, it is characterized in that: at top of gasification furnace, the powdered coal burner (9) described in a 3-6 claim 1 to 7 is installed, described powdered coal burner be evenly distributed on a circumference and with the axis being parallel of gasification furnace, the circle centre position of described powdered coal burner place circumference is provided with start-up burner (10).
9. the powdered coal burner described in claim 1 to 7 is in the application in air-flow bed coal-gasification field, it is characterized in that: central tube (1) delivery of oxidizing agent, the fine coal of inert gas is carried in the circular passage conveying that central tube (1) outer wall and peripheral tube (2) inwall are formed, and fine coal and oxidant spray from burner tip and enter gasification furnace combustion chamber and carry out oxygen debt gasification reaction.
10. one kind is reduced the thermal-radiating method in powdered coal burner central tube shower nozzle position, described powdered coal burner comprises central tube (1) and surrounds the peripheral tube (2) of this central tube with one heart, central tube (1) and peripheral tube (2) conically shrink in the side near side towards the fire, central tube (1) is oxidant channel, the circular passage that central tube (1) outer wall and peripheral tube (2) inwall are formed is fine coal passage, peripheral tube (2) is double-deck cooling water jecket, first cooling water enters chuck internal layer by cooling water inlet (13), slype by peripheral tube (2) shower nozzle position to enter outside chuck and is flowed out by coolant outlet (14), it is characterized in that: the Cross section Design at powdered coal burner central tube (1) shower nozzle position is become sharp-pointed acute angle, wherein, the interior contraction half-angle α of central tube (1) shower nozzle is 10 ° ~ 20 °, outside angle of inclination beta is 70 ° ~ 80 °, the interior contraction half-angle ε of peripheral tube (2) shower nozzle is 15 ° ~ 25 °, central tube (1) shower nozzle straight section height h
1be h with the ratio of central tube (1) nozzle diameter d
1: d=0.5 ~ 2, the distance h of central tube (1) and peripheral tube (2) vents face
2be h with the ratio of central tube (1) nozzle diameter d
2: d=0.1 ~ 0.5, internal face above central tube (1) shower nozzle straight section is arranged some equally distributed flow deflectors (3) on same circumference, flow deflector (3) is axially in a certain angle with central tube (1), fine coal import (11) is arranged on fine coal passage with the axis of powdered coal burner at an angle, communicated with the axial parallel fine coal carrier pipe (5) of central tube (1) with 2 to 4 by distributor (12), described 2 to 4 fine coal carrier pipes (5) are evenly distributed in fine coal passage, fine coal carrier pipe (5) bottom arranges spirality diversion chamber (4), fine coal carrier pipe (5) communicates with spirality diversion chamber (4), described spirality diversion chamber (4) is by top spiral rectangular tube (6), article one, the contact pin (8) that lower part helical rectangular tube (7) is connected two spiral rectangular tubes with one surrounds, one end of described contact pin (8) is connected to the shortest fine coal carrier pipe exit, the other end connects with lower part helical rectangular tube (7), article two, spiral rectangular tube extends in parallel, and be 20 ~ 45 ° with the axial angle γ of fine coal carrier pipe (5), contact pin (8) is 10 ~ 30 ° with the axial angle δ of fine coal carrier pipe (5), and make spiral rectangular tube (6), spiral rectangular tube (7) is identical with the hand of spiral of the flow deflector (3) above central tube (1) shower nozzle straight section with the hand of spiral of contact pin (8).
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| CN201410531367.6A CN104373935B (en) | 2014-10-11 | 2014-10-11 | A kind of powdered coal burner for airflow bed gasification furnace |
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| CN201410531367.6A CN104373935B (en) | 2014-10-11 | 2014-10-11 | A kind of powdered coal burner for airflow bed gasification furnace |
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| CN104373935B CN104373935B (en) | 2016-09-07 |
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| CN110577846A (en) * | 2019-09-12 | 2019-12-17 | 杨建平 | Combustion system and burner |
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