CN107906513A - A kind of U-shaped radiant tube combustion device of one-stroke countercurrent flow - Google Patents
A kind of U-shaped radiant tube combustion device of one-stroke countercurrent flow Download PDFInfo
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- CN107906513A CN107906513A CN201711175041.4A CN201711175041A CN107906513A CN 107906513 A CN107906513 A CN 107906513A CN 201711175041 A CN201711175041 A CN 201711175041A CN 107906513 A CN107906513 A CN 107906513A
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- Prior art keywords
- radiant tube
- shaped radiant
- combustion
- tube
- heat exchanger
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L15/00—Heating of air supplied for combustion
- F23L15/04—Arrangements of recuperators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
- F28D7/1615—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation the conduits being inside a casing and extending at an angle to the longitudinal axis of the casing; the conduits crossing the conduit for the other heat exchange medium
- F28D7/1623—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation the conduits being inside a casing and extending at an angle to the longitudinal axis of the casing; the conduits crossing the conduit for the other heat exchange medium with particular pattern of flow of the heat exchange media, e.g. change of flow direction
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
Present invention relates particularly to a kind of U-shaped radiant tube combustion device of one-stroke countercurrent flow, solve that existing U-shaped radiant tube heat exchange efficiency bottom is low, poor temperature uniformity, NOxDischarge the problem of high.The device includes U-shaped radiant tube, radiation inner casing tube, heat exchanger and burner；The both ends of U-shaped radiant tube are fixedly connected with heat exchanger, burner respectively, and radiation inner casing tube is arranged in U-shaped radiant tube；Heat exchanger includes cylinder, multiple heat exchanger core pipes and end caps, and burner includes housing, ignitor, combustion gas core pipe and combustion chamber；Housing is fixedly connected with U-shaped radiant tube, and combustion chamber is located in U-shaped radiant tube, including combustion outer case and burning Interior Layout.The U-shaped radiant tube combustion device of one-stroke countercurrent flow of the present invention can effectively improve heat exchange efficiency, reduce burner operating cost, while can reduce NOxDischarge, contributes for energy conservation and environmental protection.
Description
Technical field
The present invention relates to burner field, and in particular to a kind of U-shaped radiant tube combustion device of one-stroke countercurrent flow.
Background technology
U-shaped radiant tube is a kind of common indirectly heat burner, heat from radiant tube table in a manner of heat radiation
Face passes to burner hearth and heated workpiece, and since radiant tube separates combustion product and heated workpiece, combustion product will not shadow
The high-temperature atmosphere in burner hearth, furnace atmosphere and heating-up temperature are rung easy to control and is adjusted, therefore it is extensive to use radiant tube to heat
Applied in protective atmosphere heat treatment furnace kiln, such as silicon strip is heat-treated continuous annealing furnace, strip hot-dip galvanizing continuous annealing furnace.
To improve efficiency of combustion, usually U-shaped radiant tube one end installation burner, other end installation heat exchanger.In traditional U
In the design of type radiant tube, the inlet and outlet of hot-air are arranged in the homonymy of heat exchanger, and flowing of the hot-air in heat exchange at this time is two
A stroke, first stroke are countercurrent flow, and second stroke is downstream heat transfer, and in second stroke, hot-air can be forced
The heat that first stroke obtains is transferred again to flue gas or air, reduces heat exchange efficiency；Backhaul at the same time is needed to air
Return duct is set, and return duct occupies certain space, therefore the heat exchange element quantity that can be arranged is reduced, and equally reduces heat exchange effect
Rate.Pipe heat exchanger, especially intensive pipe heat exchanger (heat exchange core pipe quantity is more than 50) have that specific surface area is big, heat exchange
The characteristics of efficient, but since conventional u-shaped radiant tube heat exchanger air is the flowing of two strokes, intensive pipe heat exchanger is difficult to should
With in traditional radiant tube heat exchanger, flue gas flows outside pipe, and air is in Bottomhole pressure, the partial heat of such high-temperature flue gas
It can be rejected heat to by tube wall in environment, cause the waste of heat, reduce heat exchange efficiency.
Conventional u-shaped radiant tube heat exchanger hot air outlet temperature is generally higher than 500 DEG C, and exhaust gas temperature is very high, passes through heat exchange
The heat of device recycling is seldom so that heat exchange efficiency is very low.In addition conventional u-shaped radiant tube also has poor temperature uniformity, NOxDischarge is high
The shortcomings that.Since traditional U-shaped radiant tube air preheating temperature is generally relatively low, ignition temperature is relatively low.To improve
Heat exchange efficiency, 800~950 DEG C are preheating to by combustion air, will be very high using flame temperature during traditional combustion mode, cause heat
Power type NOxSteeply rise, pollute environment.
The content of the invention
Existing U-shaped radiant tube heat exchange efficiency bottom is low, poor temperature uniformity it is an object of the invention to solving, NOxDischarge is high
The problem of, there is provided a set of high and low NO of heat exchange efficiencyxThe U-shaped radiant tube combustion device of discharge.
Technical proposal that the invention solves the above-mentioned problems is：
A kind of U-shaped radiant tube combustion device of one-stroke countercurrent flow, including U-shaped radiant tube, radiation inner casing tube, heat exchanger
And burner；The both ends of the U-shaped radiant tube are fixedly connected with heat exchanger, burner respectively, and the radiation inner casing tube is set
In U-shaped radiant tube；The heat exchanger includes cylinder, multiple heat exchanger core pipes and end caps, the cylinder include successively by
Outer barrel, heat insulation layer and the inner cylinder set outside to inside, the both ends of the cylinder are closed by end caps；In the inner cylinder
Axially spaced setting inner ring baffle and outer shroud baffle, the circumferential size of the inner ring baffle are less than the circumferential ruler of outer shroud baffle
It is very little；The cylinder is provided with hot-blast outlet into cigarette side, and smoke evacuation side is provided with cold wind import and fume collecting chamber, the cold wind import and
Hot-blast outlet connects, and the heat exchanger core pipe through end surface cover is arranged in inner cylinder, and its one end is connected with U-shaped radiant tube,
The other end is connected with fume collecting chamber and smoke outlet tube；The burner includes housing, ignitor, combustion gas core pipe and combustion chamber；
The housing is fixedly connected with U-shaped radiant tube, and is provided with the hot wind inlet with heat exchanger hot wind outlet；The combustion chamber
In U-shaped radiant tube, including combustion outer case and burning Interior Layout, the combustion outer case is fixedly connected with the casing, described
Burning Interior Layout is arranged on inside combustion outer case, and secondary air channel is equipped between the combustion outer case and burning Interior Layout,
The secondary air channel is connected with the hot wind inlet of housing；Stable flame pan is provided with the burning Interior Layout, is set on stable flame pan
There are multiple First air through holes, the First air through hole is connected with the hot wind inlet of housing；The ignitor, combustion gas core pipe are set
Inside housings, the ignitor, one end of combustion gas core pipe are arranged in burning Interior Layout through stable flame pan, the ignition power
Pole is positioned at the one end for burning Interior Layout and is provided with gas spray head, and the combustion chamber is provided with the combustion chamber connected with U-shaped radiant tube
Outlet, combustion product are entered in radiation inner casing tube and U-shaped radiant tube by combustor exit.
Further, the area ratio of the First air through hole area of passage and secondary air channel area of passage is 6:4.
Further, the diameter of the heat exchanger core pipe is no more than 10mm, between the inner ring baffle and outer shroud baffle between
Away from for 100~150mm.Pipe heat exchanger core pipe caliber is small, can improve total heat exchange area.
Further, the heat exchanger, burner and the junction of U-shaped radiant tube and heat exchanger hot-blast outlet and burning
The junction of device hot wind inlet is wrapped in fireproof heat-insulating fiber.
Further, further to reduce heat dissipation of the heat exchanger to environment, the heat insulation layer uses aerosol heat-barrier material.
Further, the spacing of the combustor exit and radiation inner casing tube is 80~130mm.
Further, in order to increase the reflux of flue gas, the U-shaped radiant tube of a diameter of 0.7 times of the inner casing tube of radiation is straight
Footpath, radiation inner casing tube length is 5 times of U-shaped radiation pipe diameters.
Further, in order to reduce heat exchanger and the outside heat loss of burner tip, the heat exchanger and burner are remote
End from U-shaped radiant tube is both provided with heat-insulating material.
Further, the material of the burner shell is heat-resistance stainless steel, and the material of combustion chamber is carborundum, U-shaped spoke
The material for penetrating pipe is heat resisting steel, and the material for radiating inner casing tube is carborundum.
Further, the heat exchanger core pipe is pipe, square tube, flat tube or elliptical tube.
Advantages of the present invention is：
1. the U-shaped radiant tube combustion device of one-stroke countercurrent flow of the present invention can effectively improve heat exchange efficiency, burning is reduced
Device operating cost, while NO can be reducedxDischarge, contributes for energy conservation and environmental protection.
2. flue gas of the present invention, in heat exchanger core Bottomhole pressure, heat exchanger core pipe boundary layer is relatively thin, and equivalent diameter is smaller, heat exchange
Coefficient is of a relatively high, and air flows outside pipe, and using outer shroud baffle, two baffles, make air constantly wash away heat exchange core pipe back and forth,
Residence time of the air in heat exchanger is extended at the same time, improves heat exchange efficiency.
3. the present invention reduces NO using fractional combustion and flue gas recirculation modexDischarge, secondary air flow account for total blast volume
40%, excess air coefficient control is 1.05 or so, and combustor exit speed control is in more than 150m/s, combustor exit and spoke
The control of inner casing tube spacing is penetrated in 80~130mm, so as to reduce combustion zone O2Concentration, makes burning occur in low-oxygen environment, drop
Low flame temperature and reduction thermal NOxFormed.
4. the present invention is by flue gas, reflux solves the defects of poor temperature uniformity at a high speed, part burn after gas from combustion
Burn room and export and spray at a high speed, by jet stream ejector action, volume inhales a large amount of surrounding flue gases of surrounding and enters radiation inner casing tube burning, drops
Low flame peak temperature, prolonging burning time and the length of flame, improve radiant tube surface temperature uniformity.
5. the hot wind inlet of burner of the present invention and heat exchanger hot wind outlet；Due to being changed using air one-stroke adverse current
Hot device, combustion air can be preheated to very high temperature, and up to 800~950 DEG C, the combustion air of high-temperature makes in burner
Flame temperature reduces, and solves traditional combustion system flame temperature height, causes thermal NOxThe problem of steeply rising.
6. the present invention sets radiation inner casing tube, mixed gas and secondary after the primary combustion in radiant tube is sprayed at a high speed
Wind, can induce a large amount of smoke backflows, reduce fuel and O2Concentration, makes burning occur in low-oxygen environment, reduces flame temperature and subtracts
Few thermal NOxFormed.
Brief description of the drawings
Fig. 1 is the U-shaped radiant tube combustion device structure chart of one-stroke countercurrent flow of the embodiment of the present invention；
Fig. 2 is heat exchanger schematic diagram of the embodiment of the present invention；
Fig. 3 is the A-A diagrammatic cross-sections of Fig. 2；
Fig. 4 is the structure chart of burner of the embodiment of the present invention；
Fig. 5 is the structure chart of stable flame pan of the embodiment of the present invention；
Fig. 6 is the U-shaped radiant tube combustion device local structural graph of one-stroke countercurrent flow of the embodiment of the present invention.
Reference numeral：1- heat exchangers, 2- installation frames, 3- refractory thermal insulating materials, 4-U type radiant tubes, 5- radiation pipe carriers,
6- radiates inner casing tube, 7- burners, 11- smoke outlet tubes, 12- fume collecting chamber, 13- cold wind imports, 14- outer barreies, 15- thermal insulation
Layer, 16- inner cylinders, 17- heat exchanger core pipes, 18- outer shroud baffles, 19- inner ring baffles, 110- hot-blast outlets, 70- housings, 71- combustions
Gaseous core pipe, 72- ignitors,
73- sizing thermal insulation materials, 74- hot wind inlets, 75- mounting flanges, 76- stable flame pans, 77- gas spray heads, 78- burnings
Outdoor set, 79- burning Interior Layouts, 710- secondary air channels, 711- combustor exits, 712- First air through holes.
Embodiment
Present disclosure is described in further detail below in conjunction with the drawings and specific embodiments：
A kind of U-shaped radiant tube combustion device of one-stroke countercurrent flow as shown in Figures 1 to 6, including U-shaped radiant tube 4, spoke
Penetrate inner casing tube 6, heat exchanger 1 and burner 7；The both ends of U-shaped radiant tube 4 are fixedly connected with heat exchanger 1, burner 7 respectively, spoke
Inner casing tube 6 is penetrated to be arranged in U-shaped radiant tube 4；U-shaped radiant tube 4 is fixedly mounted by radiating pipe carrier 5；Heat exchanger 1 includes cylinder
Body, multiple heat exchanger core pipes 17 and end caps, cylinder include the outer barrel 14 that ecto-entad is set successively, heat insulation layer 15 and interior
Cylinder 16, the both ends of cylinder are closed by end caps；Axially spaced setting inner ring baffle 19 and outer shroud gear in inner cylinder 16
Plate 18, the circumferential size of inner ring baffle 19 are less than the circumferential size of outer shroud baffle 18；Cylinder is provided with hot-blast outlet into cigarette side
110, smoke evacuation side is provided with cold wind import 13 and fume collecting chamber 12, and cold wind import 13 is connected with hot-blast outlet 110, heat exchanger core pipe 17
It is arranged on through end caps in inner cylinder 16, its one end is connected with U-shaped radiant tube 4, and the other end goes out with fume collecting chamber 12 and flue gas
Mouth pipe 11 connects.
Burner 7 includes housing 70, ignitor 72, combustion gas core pipe 71 and combustion chamber；Housing 70 is solid with U-shaped radiant tube 4
Fixed connection, and it is provided with the hot wind inlet 74 connected with heat exchanger hot-blast outlet 110；Combustion chamber is located in U-shaped radiant tube 4, bag
Combustion outer case 78 and burning Interior Layout 79 are included, combustion outer case 78 is fixedly connected with housing 70, and burning Interior Layout 79 is arranged on
Inside combustion outer case 78, secondary air channel 710, secondary air channel are equipped between combustion outer case 78 and burning Interior Layout 79
710 connect with the hot wind inlet 74 of housing 70；Stable flame pan 76 is provided with burning Interior Layout 79, is provided with stable flame pan 76 multiple
First air through hole 712, First air through hole 712 are connected with the hot wind inlet 74 of housing 70；Ignitor 72, combustion gas core pipe 71 are set
Inside housing 70, ignitor 72, one end of combustion gas core pipe 71 are arranged in burning Interior Layout 79 through stable flame pan 76, igniting
Electrode 72 is provided with gas spray head 77 positioned at the one end for burning Interior Layout, and combustion chamber is provided with the combustion chamber connected with U-shaped radiant tube 4
Outlet 711, combustion product are entered in radiation inner casing tube 6 and U-shaped radiant tube 4 by combustor exit 711.
Burner heat exchanger 1 of the present invention uses counter-current tubular exchanger, flue gas in Bottomhole pressure, core pipe boundary layer compared with
Thin, equivalent diameter is smaller, and the coefficient of heat transfer is of a relatively high, and to improve heat exchange efficiency, the diameter of pipe heat exchanger core pipe 17 is no more than
10mm；17 caliber of pipe heat exchanger core pipe is small, can improve total heat exchange area；Caliber is small, in pipe gas for Laminar Flow,
The coefficient of heat transfer is inversely proportional with heat exchanger tube diameter, and diameter is smaller, and the coefficient of heat transfer is bigger.Air flows outside pipe, reduces heat exchanger 1
Heat dissipation to environment, air-flow direction are arranged at intervals inner ring baffle 19, outer shroud baffle 18, and spacing is 100 between two baffles
~150mm, in theory for, spacing is smaller between baffle, then heat transfer effect is better, but to after certain numerical value, increases baffle
Heat transfer effect is improved with regard to unobvious, therefore the present invention is limited to 100~150mm, in inner ring baffle 19 and outer shroud baffle 18
Under effect, air is constantly washed away heat exchange core pipe back and forth, while extend residence time of the air in heat exchanger 1, improve
Heat exchange efficiency.
U-shaped 4 burner of radiant tube may be configured as non-isometric structure by the present invention, and heat exchanger 1 is grown, and burner 7 is short, heat exchange
Device hot-blast outlet 110 and the hot wind inlet 74 of burner 7 link together, and the high temperature air being preheated is directly entered burner 7
It is interior, realize the one-stroke movement of air in heat exchanger 1, rather than as isometric U-shaped 4 structure of radiant tube of tradition, the outlet of hot-air
The end of heat exchanger 1 is arranged in, flowing of the hot-air in heat exchange is two strokes.Due to using air one-stroke countercurrent flow
Device 1, combustion air can be preheated to very high temperature, and up to 800~950 DEG C, the combustion air of high-temperature makes in burner 7
Flame temperature reduces, and solves traditional combustion system flame temperature height, causes thermal NOxThe problem of steeply rising.
In order to which easy for installation and reduction is to external heat losses, heat exchanger 1, burner 7 and the flanged joint of radiant tube are sentenced
And heat exchanger 1 and the flange connections of burner 7 are wrapped in refractory thermal insulating material 3, refractory thermal insulating material 3 is specially that fire resisting is exhausted
Thermal fiber, fireproof heat-insulating fiber are fixedly mounted by installation frame 2, further to reduce heat dissipation of the heat exchanger 1 to environment, are used
Aerosol heat-barrier material, while to overcome lacking for aerosol heat-barrier material (thermal conductivity factor is less than 0.03J/m* DEG C) intensity deficiency
Point, is filled between 1 inside and outside casing of heat exchanger.In order to reduce the outside heat loss of heat exchanger 1 and 7 end of burner,
The end of heat exchanger 1 and burner 7 is respectively provided with heat-insulating material.The material of combustion outer case 78 is heat-resistance stainless steel, such as
Cr25Ni20, the material of combustion chamber is carborundum, and the material of U-shaped radiant tube 4 is heat resisting steel, and the material of radiation inner casing tube 6 is
Carborundum.
The present invention reduces NO using fractional combustion and flue gas recirculation modexDischarge, fractional combustion will the required skies of burning
Qi leel level is sent into combustion zone, and flue gas recirculation is by the way that the flue gas for generation of burning is reintroduced back to combustion zone, reduces reaction
The oxygen concentration in area, so as to fulfill flame peak temperature is reduced, reaches and reduces NOxThe purpose of discharge；Influence thermal NOxGeneration
Principal element include temperature and O2Concentration, flue gas recirculating technique can reduce the two parameters at the same time.Excess air coefficient α
It is to influence NOxThe important parameter of generation, can change the excess air coefficient α in primary zone domain by air classification, send out burning
Life is in α<In 1 atmosphere, burning is divided into oxygen-depleted zone and oxygen-rich area.Secondary Air outlet is positioned at the outside of combustor exit 711, secondary air flow
Account for the 40% of total blast volume, excess air coefficient control 1.05 or so, 711 speed control of combustor exit 150m/s with
On, excess air coefficient α is the ratio of actual air dosage and theoretical air dosage, by controlling the air into combustion apparatus
Amount and gas quantity, realize the control to excess air coefficient.Combustor exit 711 and the 6 spacing control of radiation inner casing tube are 80
~130mm, so as to reduce combustion zone O2Concentration, makes burning occur in low-oxygen environment, reduces flame temperature and reduces heating power type
NOxFormed.Combustor exit 711 and radiation 6 spacing of inner casing tube are excessive or too small, are all unfavorable for inducing smoke backflow, because
This distance is limited to 80~130mm by this present invention.
The radiation pipe diameter that 6 diameter of inner casing tube is about 0.7 times is radiated, radiation 6 length of inner casing tube is about 5 times of radiant tubes
Diameter, 0.7 times of radiation pipe diameter, the circulation area the purpose is to ensure sleeve outer shroud and sleeve inner circle is close, radiant tube
6 length of inner sleeve is about 5 times of radiation pipe diameters, it is therefore an objective to increases the reflux of flue gas, while ensures the length of sleeve, so as to secondary
Burning can be completed in sleeve.
To reduce the leakage of air, combustion outer case 78 and combustion chamber mounting flange 75 as casting or welding structure, firing
Burn and form secondary air channel 710 between outdoor set 78 and combustion chamber.Heat exchanger core pipe 17 be pipe be only form of the present invention it
The other forms such as one or square tube, flat tube, elliptical tube.
The course of work：Combustion air is passed first into, burner 7 is purged, purge time was not less than 1 minute, then
Igniting detecting electrode is adjusted to ignition mode, sustained breakdown air release electric spark.Be passed through combustion gas, combustion gas through combustion gas core pipe 71,
Sprayed into by gas spray head 77 in combustion chamber, the combustion air less than 60% forms swirling eddy, into burning by stable flame pan 76
Room.The combustion gas that gas spray head 77 sprays is mixed with rotating air draught in combustion chamber, is ignited firing under the action of electric spark
Burn.Then, ignitor 72 is closed, igniting detecting electrode will enter detection pattern, if ion current signal cannot be detected,
Combustion gas is closed, restarts purging and ignition operation, if ion current signal can be detected, shows that gas burner 7 works just
Often.40% combustion air is burnt by the gap between combustion chamber and combustion outer case 78, the at a high speed interior participation of penetrating radiant tube,
Ratio by First air discharge area and Secondary Air discharge area is about 6:4.Gas after Indoor Combustion of burning, from combustion chamber
Outlet 711 sprays at a high speed, more than 150m/s.Mixed gas and Secondary Air after primary combustion in penetrating radiant tube at a high speed, can lure
A large amount of smoke backflows are led, reduce fuel and O2Concentration, makes burning occur in low-oxygen environment, reduces flame temperature and reduces heating power type
NOxFormed.
Flue gas will be moved along radiant tube, into heat exchanger core pipe 17, about 1000 DEG C of flue-gas temperature at this time, subsequently into changing
1 fume collecting chamber 12 of Re Qi, is discharged by 1 smoke outlet tube 11 of heat exchanger, and the flue-gas temperature that heat exchanger 1 is discharged is less than 300 DEG C.It is combustion-supporting cold
Air is entered in heat exchanger 1 by cold air inlet duct, in the case where heat exchanger inner ring baffle 19 and outer shroud baffle 18 act on, can laterally be rushed
Brush heat exchanger core pipe 17, air themperature will be preheated to 800 DEG C after several strokes, and the air being then preheated is by heat exchanger
1 hot air outlet outflow heat exchanger 1, by hot air inlet, into burner 7, participates in burning.
Claims (10)
- A kind of 1. U-shaped radiant tube combustion device of one-stroke countercurrent flow, it is characterised in that：Including U-shaped radiant tube (4), radiant tube Inner sleeve (6), heat exchanger (1) and burner (7)；The both ends of the U-shaped radiant tube (4) respectively with heat exchanger (1), burner (7) it is fixedly connected, the radiation inner casing tube (6) is arranged in U-shaped radiant tube (4)；The heat exchanger (1) includes cylinder, multiple heat exchanger core pipes (17) and end caps, and the cylinder is included successively by extroversion The outer barrel (14) of interior setting, heat insulation layer (15) and inner cylinder (16), the both ends of the cylinder are closed by end caps；It is described Axially spaced setting inner ring baffle (19) and outer shroud baffle (18), the circumferential ruler of the inner ring baffle (19) in inner cylinder (16) The very little circumferential size less than outer shroud baffle (18)；The cylinder is provided with hot-blast outlet (110) into cigarette side, and smoke evacuation side is provided with Cold wind import (13) and fume collecting chamber (12), the cold wind import (13) connect with hot-blast outlet (110), the heat exchanger core pipe (17) it is arranged on through end caps in inner cylinder (16), its one end is connected with U-shaped radiant tube (4), the other end and fume collecting chamber (12) connected with smoke outlet tube (11)；The burner (7) includes housing (70), ignitor (72), combustion gas core pipe (71) and combustion chamber；The housing (70) It is fixedly connected with U-shaped radiant tube (4), and is provided with the hot wind inlet (74) connected with heat exchanger hot-blast outlet (110)；The combustion chamber is located in U-shaped radiant tube (4), including combustion outer case (78) and burning Interior Layout (79), the burning Outdoor set (78) is fixedly connected with housing (70), and the burning Interior Layout (79) is arranged on combustion outer case (78) inside, described Secondary air channel (710), the secondary air channel (710) and shell are equipped between combustion outer case (78) and burning Interior Layout (79) Hot wind inlet (74) connection of body；Stable flame pan (76) is provided with the burning Interior Layout (79), stable flame pan is provided with (76) Multiple First air through holes (712), the First air through hole (712) connect with the hot wind inlet (74) of housing；The ignitor (72), combustion gas core pipe (71) is arranged on housing (70) inside, and the ignitor (72), one end of combustion gas core pipe (71) are through surely Flame disk (76) is arranged in burning Interior Layout (79), and the ignitor (72) is positioned at the one end for burning Interior Layout and is provided with combustion gas Nozzle (77), the combustion chamber are provided with the combustor exit (711) connected with U-shaped radiant tube (4), and combustion product passes through burning Room outlet (711) enters in radiation inner casing tube (6) and U-shaped radiant tube (4).
- 2. the U-shaped radiant tube combustion device of one-stroke countercurrent flow according to claim 1, it is characterised in that：It is described once The area ratio of wind through hole (712) area of passage and secondary air channel (710) area of passage is 6:4.
- 3. the U-shaped radiant tube combustion device of one-stroke countercurrent flow according to claim 2, it is characterised in that：The heat exchange The diameter of device core pipe (17) is no more than 10mm, between the inner ring baffle (19) and outer shroud baffle (18) spacing for 100~ 150mm。
- 4. the U-shaped radiant tube combustion device of one-stroke countercurrent flow according to claim 1 or 2 or 3, it is characterised in that：Institute State heat exchanger (1), burner (7) and the junction of U-shaped radiant tube (4) and heat exchanger hot-blast outlet (110) and burner heat The junction of wind inlet (74) is wrapped in fireproof heat-insulating fiber.
- 5. the U-shaped radiant tube combustion device of one-stroke countercurrent flow according to claim 4, it is characterised in that：The thermal insulation Layer (15) uses aerosol heat-barrier material.
- 6. the U-shaped radiant tube combustion device of one-stroke countercurrent flow according to claim 5, it is characterised in that：The burning It is 80~130mm that room, which exports (711) and the spacing of radiation inner casing tube (6),.
- 7. the U-shaped radiant tube combustion device of one-stroke countercurrent flow according to claim 6, it is characterised in that：The radiation U-shaped radiant tube (4) diameter of a diameter of 0.7 times of inner casing tube (6), radiation inner casing tube (6) length are 5 times of U-shaped radiant tubes (4) Diameter.
- 8. the U-shaped radiant tube combustion device of one-stroke countercurrent flow according to claim 7, it is characterised in that：The heat exchange The end of device (1) and burner (7) away from U-shaped radiant tube (4) is both provided with heat-insulating material.
- 9. the U-shaped radiant tube combustion device of one-stroke countercurrent flow according to claim 8, it is characterised in that：The burning The material of device housing (70) is heat-resistance stainless steel, and the material of combustion chamber is carborundum, and the material of U-shaped radiant tube (4) is heat resisting steel, The material for radiating inner casing tube (6) is carborundum.
- 10. the U-shaped radiant tube combustion device of one-stroke countercurrent flow according to claim 9, it is characterised in that：The heat exchange Device core pipe (17) is pipe, square tube, flat tube or elliptical tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711175041.4A CN107906513A (en) | 2017-11-22 | 2017-11-22 | A kind of U-shaped radiant tube combustion device of one-stroke countercurrent flow |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711175041.4A CN107906513A (en) | 2017-11-22 | 2017-11-22 | A kind of U-shaped radiant tube combustion device of one-stroke countercurrent flow |
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| CN107906513A true CN107906513A (en) | 2018-04-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711175041.4A Pending CN107906513A (en) | 2017-11-22 | 2017-11-22 | A kind of U-shaped radiant tube combustion device of one-stroke countercurrent flow |
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| Country | Link |
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| CN (1) | CN107906513A (en) |
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| CN109404913A (en) * | 2018-12-08 | 2019-03-01 | 佛山市科皓燃烧设备制造有限公司 | A kind of flame inner tube and its radiant tube applied in radiant tube |
| CN109539258A (en) * | 2019-01-11 | 2019-03-29 | 佛山市科皓燃烧设备制造有限公司 | A kind of low NOx radiant tube combustion system of adjustable smoke backflow amount |
| CN111425856A (en) * | 2020-04-03 | 2020-07-17 | 首钢智新迁安电磁材料有限公司 | Heat accumulating type radiant tube burner |
| CN112303625A (en) * | 2020-10-09 | 2021-02-02 | 北京科技大学 | Gas radiant tube heat exchanger |
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| CN112303625A (en) * | 2020-10-09 | 2021-02-02 | 北京科技大学 | Gas radiant tube heat exchanger |
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