CN209622774U - Pelletizing rotary kiln low NO - Google Patents
Pelletizing rotary kiln low NO Download PDFInfo
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- CN209622774U CN209622774U CN201821877291.2U CN201821877291U CN209622774U CN 209622774 U CN209622774 U CN 209622774U CN 201821877291 U CN201821877291 U CN 201821877291U CN 209622774 U CN209622774 U CN 209622774U
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- 238000005453 pelletization Methods 0.000 title claims abstract description 46
- 239000003034 coal gas Substances 0.000 claims abstract description 22
- 239000004020 conductor Substances 0.000 claims abstract description 14
- 238000002485 combustion reaction Methods 0.000 claims description 18
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract description 62
- 239000007789 gas Substances 0.000 abstract description 30
- 238000004519 manufacturing process Methods 0.000 abstract description 20
- 238000005516 engineering process Methods 0.000 abstract description 7
- 230000002093 peripheral effect Effects 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 28
- 206010008190 Cerebrovascular accident Diseases 0.000 description 14
- 208000006011 Stroke Diseases 0.000 description 14
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical class [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 230000008676 import Effects 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- 230000006872 improvement Effects 0.000 description 5
- 239000000571 coke Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000008188 pellet Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 206010020843 Hyperthermia Diseases 0.000 description 3
- 235000004443 Ricinus communis Nutrition 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- 230000036031 hyperthermia Effects 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
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- Manufacture And Refinement Of Metals (AREA)
Abstract
The utility model discloses a kind of pelletizing rotary kiln low NOs, belong to rotary kiln technology, including air hose and burner body, and the center of burner body is cylindrical body, sets cylindrical air duct on the cylinder, along cylindrical body direction of axis line；The first cylinder of cylindrical body peripheral hardware and cylindrical body coaxial inner conductor, the first cylinder are connected with cylindrical body by the first fan blade, and the gap between the first cylinder and cylindrical body is coke-stove gas channel；It is the second cylinder with cylindrical body coaxial inner conductor outside the first cylinder, the second cylinder is connected with the first cylinder by the second fan blade, and the gap between the second cylinder and the first cylinder is coal gas of converter channel；Hollow cuboid air duct, hollow cuboid air duct longitudinal direction and burner body axis parallel are set between the inside and outside wall of the second cylinder.The low NO of the utility model is used to that flame temperature can be reduced when pelletizing production, extends the length of flame, and the concentration of nitrogen oxides is reduced from source, reduces exhaust-gas treatment cost, reduces the pollution to environment.
Description
Technical field
The utility model relates to burner, especially a kind of pelletizing rotary kiln burner belongs to rotary kiln technology.
Background technique
Pellet is the main iron-containing charge that China's blast furnace ironmaking generates, and pellet production line generally uses chain grate machine-revolution
Kiln-ring cold machine production technology, yield account for 60% or more of pelletizing total output.Rotary kiln is that a core in pelletizing process is set
Standby, it is important that the quality of operation directly influences yield rate, energy consumption index, operating rate, environmental protection index of a whole set of pelletizing process etc.
Index.The effect of rotary kiln is the thermal-flame generated using central burner ontology, is carried out in kiln for thermosetting High Temperature Gas
Atmosphere, to be roasted to the pelletizing for entering rotary kiln.Grate-kiln-ring cold machine production technology is in production acid pellet
A certain amount of nitrogen oxides can be generated in the process.In recent years, increasingly sophisticated with iron ore raw material and fuel, bloodstone ratio
(maturing temperature is caused to increase), the scale utilization of low-rank fuel, the application of the nitrogenous coke-stove gas of gas base rotary kiln etc. are improved, is made
It is in rising trend to obtain many enterprise's pelletizing production process discharged nitrous oxides concentrations；What Environmental Protection in China required in addition is increasingly harsh,
Discharged nitrous oxides are included into the checking system of discharge, and from 2015, pelletizing production nitrogen oxides was (with NO2Meter) emission limit
300mg/m3, external then tightened up, some even requires the main smoke stack emission nitrous oxides concentration of pelletizing process in 200mg/m3With
It is interior.
The method of nitrous oxides concentration (denitrating flue gas) is generally de- using ozone in existing reduction rotary kiln waste gas
Nitre technique, activated coke denitrating technique, SCR technology, wherein activated coke denitration and SCR technology are by adding mild catalyst, by nitrogen
Oxide is reduced into nitrogen and water, and wherein ozone denitrating technique is by nitrogen oxides into N2O5(being dissolved in water) realizes nitrogen oxidation
The qualified discharge of object.The core of three kinds of above-mentioned denitrating techniques is passively post-processing, not from generation nitrogen oxides
It tries every possible means in root, and the denitrating technique that environmental protection administration, government is approved now only has activated coke denitrating technique, but activated coke is de-
The investment of nitre technique and operating cost are all larger, and this technique occupied area is also larger, these will increase project cost again, make to look forward to
The production cost of industry is high；Remaining two kinds of processing mode disadvantage big there is also equipment investment.
Patent document CN207163232U discloses a kind of grate-kiln pelletizing low NOx process units, In
Changeover portion between second preheating section of chain grate machine and the tail end of rotary kiln is equipped with reducing agent injection apparatus, by inverse with flue gas
High-temperature flue gas after allowing reducibility gas and iron ore pellets material to roast to injection reducibility gas be sufficiently mixed and compared with
Prolonged reaction, thus realize the non-catalytic reduction of nitrogen oxides to reduce the content of nitrogen oxides in effluent, this device knot
Structure is complicated, and is also to handle after high concentration nitrogen oxide generation it, and reduction reaction degree is not easy to control, and reaction is also
It need to carry out the long period, high concentration nitrogen oxide removal is undesirable, removal required time is longer.
Patent document CN106052378A discloses a kind of low NOx cleaning burning type rotary kiln and its Combustion System,
The rotary kiln includes rotary kiln and central burner ontology and secondary air channel set on rotary kiln, and secondary air channel includes secondary again
Wind general pipeline and several Secondary Air branch pipes being connected with Secondary Air general pipeline further respectively have flow valve on Secondary Air branch pipe, make
Secondary Air can enter from multiple spot rotary kiln and can real-time control enter flow, reduce NO_x formation to a certain extent
Rate, but the rotary structure is more complex, can not avoid the overlapping of oxygen-rich area and high-temperature region completely, and also needs existing work
Equipment in skill carries out biggish change or thoroughly replacement, invests huger.
Patent document CN203068517U discloses a kind of rotary kiln gas burner ontology, including coal gas casing and set
The casing air outside coal gas casing is connect, between air delivery between the inner wall of casing air and the outer wall of coal gas casing
Gap, has the mixed zone of a cone-shaped on the outside of the output end of the coal gas casing in casing air, which exists
Coal gas and air delivery are adequately mixed after entering, and localized hyperthermia are formed when causing to light, localized hyperthermia can lead to sky
Oxidation of nitrogen in gas generates high concentration nitrogen oxide, and not up to standard, pollution of the increase to environment is discharged so as to cause exhaust gas.
Summary of the invention
The utility model technical issues that need to address are to provide a kind of pelletizing rotary kiln burner body, can be from source
The upper concentration for reducing nitrogen oxides, makes nitrogen oxides reach discharge standard, reduces enterprise's exhaust-gas treatment cost and environmental pollution.
In order to solve the above technical problems, the technical scheme adopted by the utility model is:
A kind of pelletizing rotary kiln low NO, including air hose and burner body, the center of the burner body are set
Have cylindrical body, on the cylinder, along cylindrical body direction of axis line be equipped with cylindrical air duct；The outside of cylindrical body is equipped with and cylinder
The first cylinder of body coaxial inner conductor, the first cylinder is connected with cylindrical body by the first fan blade, between the first cylinder and cylindrical body
Gap is coke-stove gas channel；The outside of the first cylinder is equipped with the second cylinder with cylindrical body coaxial inner conductor, the second cylinder and the
One cylinder is connected by the second fan blade, and the gap between the second cylinder and the first cylinder is coal gas of converter channel；The second cylinder
Hollow cuboid air duct, hollow cuboid air duct longitudinal direction and burner body axis parallel are equipped between inside and outside wall.
Technical solutions of the utility model further improvement lies in that: the cylindrical air duct by be located at center 1
A large aperture cylinder, 22~28 small-bore cylinders positioned at large aperture cylinder periphery form.
Technical solutions of the utility model further improvement lies in that: the number of first fan blade be 6~10, the second wind
The number of leaf is 14~18.
Technical solutions of the utility model further improvement lies in that: first fan blade and the second fan blade are at incline structure
Setting, and the inclined direction of the first fan blade and the second fan blade is opposite.
Technical solutions of the utility model further improvement lies in that: the number in the hollow cuboid air duct be 35~41
It is a.
Technical solutions of the utility model further improvement lies in that: the outer wall of described the second cylinder further includes a Duan Yanshen
Area.
By adopting the above-described technical solution, the technological progress that the utility model obtains is:
The rotary kiln burner of the utility model is used to that flame temperature can be reduced when pelletizing production, extends the length of flame, can
It avoids oxygen-rich area Chong Die with the long-term fixation of high-temperature region, the concentration of nitrogen oxides is reduced from source, thereby reduces exhaust gas
Processing cost reduces the pollution to environment；The utility model also has the advantages that simple and reasonable, preparation process is simple.
The pelletizing rotary kiln burner body of the utility model, only by the cylindrical body at center, cylindrical outer first
Cylinder and the second cylinder form, and the cylindrical air duct being arranged on cylindrical body is apoplexy channel, between the first cylinder and cylindrical body
Gap is coke-stove gas channel, and is separated by the first fan blade, and the gap between the second cylinder and the first cylinder is logical for coal gas of converter
Road, and separated by the second fan blade, the hollow cuboid air duct being arranged in the second cylinder is axis stream wind channel；Apoplexy channel and axis stream
Wind channel is the channel that combustion air passes through, and the structure of burner body is simple and reasonable, and processing technology is simple, is used for existing
In technique, it is not required to carry out any change to rotary kiln other component, scrap build cost is minimized.
The pelletizing rotary kiln burner body of the utility model, the design in columnar apoplexy channel is so that combustion air
Approach axis and rotary kiln axis parallel, the design in the axis stream wind channel of hollow cuboid but also combustion air approach axis
Also with rotary kiln axis parallel；First fan blade and the second fan blade relative to burner body axial line inclined direction on the contrary,
So that coke-stove gas can be mixed comparatively fast after spraying from burner body with coal gas of converter；The utility model combustion air is from combustion
Burner ontology is located inside and out mixed gas after spraying, and will not mix strongly rapidly with mixed gas, but gradually divide
Section mixing, it is entirely avoided the concentrated combustion of coal gas avoids localized hyperthermia, so that the burner body length of flame is prolonged
Long, burning point moves back, so that the flame temperature of burner body is reduced to 1500 DEG C of temperature below for being not likely to produce nitrogen oxides,
The production quantity for reducing nitrogen oxides makes the concentration of nitrogen oxides down to 70mg/m from source3, even lower.
Detailed description of the invention
Fig. 1 is the cross-sectional structure schematic diagram of burner body in the utility model embodiment 1-3；
Fig. 2 is the vertical section knot of the burner body gas ejection end of low NO in the utility model embodiment 1-3
Structure schematic diagram；
Fig. 3 is the structural schematic diagram of low NO in embodiment 1-3；
Wherein, 1- cylindrical body, 2- the first cylinder, the first fan blade of 3-, 4- the second cylinder, the second fan blade of 5-, 6- are hollow rectangular
Body air duct, the large aperture 7- cylinder, the small-bore 8- cylinder, 9- extension area, 10- Hand-operated butterfly valve, 11- air hose, 12- burner body.
Specific embodiment
The utility model is described in further details below with reference to embodiment:
A kind of pelletizing rotary kiln low NO, burner include air hose 11 and burner body 12, air hose 11 and combustion
Burner ontology 12 is communicated by isocon with burner body 12, and the center of burner body 12 is cylindrical structure, in cylinder
Direction of axis line on body 1, along cylindrical body 1 is equipped with cylindrical air duct, and cylindrical air duct is big by 1 that is located at 1 center of cylindrical body
Aperture cylinder 7,22~28 small-bore cylinders positioned at 7 periphery of large aperture cylinder form, and cylindrical air duct is apoplexy channel, supply
Combustion air passes through.
The outside of cylindrical body 1 is with the first cylinder 2 of 1 coaxial inner conductor of cylindrical body, the first cylinder 2 and cylindrical body 1 by the
One fan blade 3 connects, and the number of the first fan blade 3 is 6~10, and the gap between the first cylinder 2 and cylindrical body 1 is logical for coke-stove gas
Road is separated by the first fan blade 3.The outside of the first cylinder 2 is the second cylinder 4 with 1 coaxial inner conductor of cylindrical body, the second cylinder 4 with
The first cylinder 2 is connected by the second fan blade 5, and the number of the second fan blade 5 is 14~18, between the second cylinder 4 and the first cylinder 2
Gap be coal gas of converter channel, separated by the second fan blade 5.First fan blade 3 and the second fan blade 5 are arranged at incline structure, and
And first fan blade 3 and the second fan blade 5 inclined direction on the contrary, making coke-stove gas and coal gas of converter after burner body ejection
Meeting cross-mixing is together.
Peripheral direction between the inside and outside wall of the second cylinder 4, along the second cylinder 4 is equipped with hollow cuboid air duct 6, hollow length
6 longitudinal direction of cube air duct and burner body axis parallel；Hollow cuboid air duct 6 is axis stream wind channel, is passed through for combustion air,
Its number is 35~41；The outer wall of the second cylinder 4 further includes one section of extension area 9, and extension area 9 is the outer wall edge in axis stream wind channel
A Duan Yanshen on wind emission direction.
Combustion air enters burner body by air hose 11 and two isocons, is then adjusted and is entered by Hand-operated butterfly valve 10
Air quantity in apoplexy channel and axis stream wind channel.
Embodiment 1
By taking the grate-kiln-ring cold machine technique for producing pelletizing 60~800,000 ton per year as an example, as shown in figure 3, rotary kiln is used
The longitudinal length of burner body 12 is 5950mm.As depicted in figs. 1 and 2, a kind of pelletizing rotary kiln low NO, including
Air hose 11 and burner body 12, burner sheet, 12 center are cylindrical structure, and the outer diameter of cylindrical body 1 is 130mm, in circle
Direction of axis line on cylinder 1, along cylindrical body 1 is equipped with cylindrical air duct, and cylindrical air duct is by being located at 1 of 1 center of cylindrical body
(small-bore cylinder 8 is in large aperture circle for the composition of small-bore cylinder 8 that 7,25 diameters of the large aperture cylinder that diameter is 35mm are 16mm
The periphery of cylinder 7 is arranged into two circles, and the number apart from the closer small-bore cylinder 8 of large aperture cylinder 7 is 9, and is uniformly distributed；Away from
Number from the farther away small-bore cylinder 8 of large aperture cylinder 7 is 16, and is uniformly distributed), cylindrical air duct is apoplexy channel,
Pass through for combustion air.
The outside of cylindrical body 1 is the first cylinder 2 with 1 coaxial inner conductor of cylindrical body, and the diameter of the first cylinder 2 is 300mm, the
One cylinder 2 is connected with cylindrical body 1 by the first fan blade 3, and the number of the first fan blade 3 is 8, between the first cylinder 2 and cylindrical body 1
Gap be coke-stove gas channel, separated by the first fan blade 3.The outside of the first cylinder 2 is second with 1 coaxial inner conductor of cylindrical body
Cylinder 4, the internal diameter of the second cylinder 4 is 680mm, outer diameter 780mm, and the second cylinder 4 passes through 5 phase of the second fan blade with the first cylinder 2
It connects, the number of the second fan blade 5 is 16, and the gap between the second cylinder 4 and the first cylinder 2 is coal gas of converter channel, by second
Fan blade 5 separates.First fan blade 3 and the second fan blade 5 are arranged at incline structure, and the inclination of the first fan blade 3 and the second fan blade 5
It is contrary, so that coke-stove gas is understood together with cross-mixing after burner body ejection with coal gas of converter.
Peripheral direction between the inside and outside wall of the second cylinder 4, along the second cylinder 4 is equipped with hollow cuboid air duct 6, hollow length
Cube air duct 6 is longitudinal and burner body axis parallel, the cross section in hollow cuboid air duct 6 are the rectangular of 15mm × 40mm
Shape, number are 38；Hollow cuboid air duct 6 is axis stream wind channel, is passed through for combustion air；The outer wall of the second cylinder 4 further includes
One section of extension area 9, the length of extension area 9 are 80mm.
Above-mentioned pelletizing rotary kiln with burner body head 1000mm use heat resisting steel material (chemical formula for
1Gr18Ni9Ti), burner rest part uses common material.
Pelletizing rotary kiln in the present embodiment is used for pelletizing production technique with low NO, pelletizing production uses chain castor
Machine-rotary kiln-ring cold machine technique, specific process parameter are as follows: coke-stove gas pressure 3.5KPa at burner body, coal gas of converter pressure
Power is 8.0KPa, and a wind flow (total flow of apoplexy and axis stream wind) is 6800m3/ h, primary wind pressure be (apoplexy and axis stream wind
Stagnation pressure) it is 22KPa；Rotary kiln end pressure is -10Pa, and kiln tail pressure is -191Pa；Kiln tail blower east kiln tail import negative pressure-
5000Pa, eastern kiln tail flow 300010m3/ h, western kiln tail import negative pressure -5000Pa, western kiln tail flow 150000m3/h；Chain grate machine
920 DEG C of 1# petticoat pipe temperature, 310 DEG C of temperature of several mouthfuls of circulating fan, cloth flatness ± 8.It lights low NO and carries out pelletizing life
Technological parameter is detected when production, testing result is that the length of flame is 15m, and flame temperature is 1480 DEG C, rotary kiln end temperature
Degree is 830 DEG C, and kiln end temperature is 1020 DEG C, and the concentration of kiln tail nitrogen oxides is 70mg/m3。
Embodiment 2
By taking the grate-kiln-ring cold machine knife technique for producing pelletizing 60~800,000 ton per year as an example, as shown in figure 3, rotary kiln
It is 5900mm with the longitudinal length of burner, part A is the burner body of burner head, the length of burner body in Fig. 3
Degree is 950mm.As depicted in figs. 1 and 2, a kind of pelletizing rotary kiln low NO, including air hose 11 and burner body 12,
The center of burner body 12 is cylindrical structure, and the outer diameter of cylindrical body 1 is 125mm, on the cylinder, along the axis of cylindrical body 1
Heart line direction is equipped with cylindrical air duct, the large aperture cylinder that cylindrical air duct is 33mm by 1 diameter for being located at center
The composition of small-bore cylinder 8 that 7,22 diameters are 14mm (small-bore cylinder 8 is arranged into two circles in the periphery of large aperture cylinder 7, away from
Number from the closer small-bore cylinder 8 of large aperture cylinder 7 is 7, and is uniformly distributed；It is farther away small apart from large aperture cylinder 7
The number of aperture cylinder 8 is 15, and is uniformly distributed), cylindrical air duct is apoplexy channel, is passed through for combustion air.
The outside of cylindrical body 1 is the first cylinder 2 with 1 coaxial inner conductor of cylindrical body, and the diameter of the first cylinder 2 is 280mm, the
One cylinder 2 is connected with cylindrical body 1 by the first fan blade 3, and the number of the first fan blade 3 is 6, between the first cylinder 2 and cylindrical body 1
Gap be coke-stove gas channel, separated by the first fan blade 3.The outside of the first cylinder 2 is second with 1 coaxial inner conductor of cylindrical body
Cylinder 4, the internal diameter of the second cylinder 4 is 650mm, outer diameter 740mm, and the second cylinder 4 passes through 5 phase of the second fan blade with the first cylinder 2
It connects, the number of the second fan blade 5 is 14, and the gap between the second cylinder 4 and the first cylinder 2 is coal gas of converter channel, by second
Fan blade 5 separates.First fan blade 3 and the second fan blade 5 are arranged at incline structure, and the inclination of the first fan blade 3 and the second fan blade 5
It is contrary, so that coke-stove gas is understood together with cross-mixing after burner body ejection with coal gas of converter.
Peripheral direction between the inside and outside wall of the second cylinder 4, along the second cylinder 4 is equipped with hollow cuboid air duct 6, hollow length
Cube air duct 6 is longitudinal and burner body axis parallel, the cross section in hollow cuboid air duct 6 are the rectangular of 14mm × 37mm
Shape, number are 35；Hollow cuboid air duct 6 is axis stream wind channel, is passed through for combustion air；The outer wall of the second cylinder 4 further includes
One section of extension area 9, the length of extension area 9 are 75mm.
Above-mentioned pelletizing rotary kiln with burner body head 1000mm use heat resisting steel material (chemical formula for
1Gr18Ni9Ti), burner rest part uses common material.
Pelletizing rotary kiln in the present embodiment is used for pelletizing production technique with low NO, pelletizing production uses chain castor
Machine-rotary kiln-ring cold machine technique, specific process parameter are as follows: coke-stove gas pressure 4.5KPa at burner body, coal gas of converter pressure
Power is 12.0KPa, and a wind flow (total flow of apoplexy and axis stream wind) is 7000m3/ h, primary wind pressure (apoplexy and axis stream wind
Stagnation pressure) be 20KPa；Rotary kiln end pressure is -10Pa, and kiln tail pressure is -190Pa；Kiln tail blower east kiln tail import negative pressure-
5010Pa, eastern kiln tail flow 300000m3/ h, western kiln tail import negative pressure -5010Pa, western kiln tail flow 150010m3/h；Chain grate machine
950 DEG C of 1# petticoat pipe temperature, 330 DEG C of temperature of several mouthfuls of circulating fan, cloth flatness ± 8.It lights low NO and carries out pelletizing life
Technological parameter is detected when production, testing result is that the length of flame is 15.5m, and flame temperature is 1490 DEG C, rotary kiln end
Temperature is 828 DEG C, and kiln end temperature is 1022 DEG C, and the concentration of kiln tail nitrogen oxides is 90mg/m3。
Embodiment 3
By taking the grate-kiln-ring cold machine technique for producing pelletizing 60~800,000 ton per year as an example, as shown in figure 3, rotary kiln is used
The longitudinal length of burner is 6000mm.As depicted in figs. 1 and 2, a kind of pelletizing rotary kiln low NO, including air hose 11
With burner body 12, burner sheet, 12 center is cylindrical structure, and the outer diameter of cylindrical body 1 is 135mm, on the cylinder,
It is equipped with cylindrical air duct along the direction of axis line of cylindrical body 1, cylindrical air duct is by 1 diameter for being located at 1 center of cylindrical body
(small-bore cylinder 8 is in large aperture cylinder 7 for the composition of small-bore cylinder 8 that 7,28 diameters of large aperture cylinder of 37mm are 18mm
Periphery is arranged into two circles, and the number apart from the closer small-bore cylinder 8 of large aperture cylinder 7 is 10, and is uniformly distributed；Distance is big
The number of the farther away small-bore cylinder 8 of aperture cylinder 7 is 18, and is uniformly distributed), cylindrical air duct is apoplexy channel, for helping
Combustion wind passes through.
The outside of cylindrical body 1 is the first cylinder 2 with 1 coaxial inner conductor of cylindrical body, and the diameter of the first cylinder 2 is 320mm, the
One cylinder 2 and cylindrical body 1 are connected by the first fan blade 3, and the number of the first fan blade 3 is 10, the first cylinder 2 and cylindrical body 1 it
Between gap be coke-stove gas channel, separated by the first fan blade 3.The outside of the first cylinder 2 is the with 1 coaxial inner conductor of cylindrical body
Two cylinders 4, the internal diameter of the second cylinder 4 is 700mm, outer diameter 800mm, the second cylinder 4 and the first cylinder 2 pass through the second fan blade 5
Connect, the number of the second fan blade 5 is 18, and the gap between the second cylinder 4 and the first cylinder 2 is coal gas of converter channel, by the
Two fan blades 5 separate.First fan blade 3 and the second fan blade 5 are arranged at incline structure, and the first fan blade 3 and the second fan blade 5 incline
Tilted direction is on the contrary, understand coke-stove gas together with cross-mixing after burner body ejection with coal gas of converter.
Peripheral direction between the inside and outside wall of the second cylinder 4, along the second cylinder 4 is equipped with hollow cuboid air duct 6, hollow length
Cube air duct 6 is longitudinal and burner body axis parallel, the cross section in hollow cuboid air duct 6 are the rectangular of 16mm × 42mm
Shape, number are 41；Hollow cuboid air duct 6 is axis stream wind channel, is passed through for combustion air；The outer wall of the second cylinder 4 further includes
One section of extension area 9, the length of extension area 9 are 85mm.
Above-mentioned pelletizing rotary kiln with burner body head 1000mm use heat resisting steel material (chemical formula for
1Gr18Ni9Ti), burner rest part uses common material.
Pelletizing rotary kiln in the present embodiment is used for pelletizing production technique with low NO, pelletizing production uses chain castor
Machine-rotary kiln-ring cold machine technique, specific process parameter are as follows: coke-stove gas pressure 5.5KPa at burner body, coal gas of converter pressure
Power is 10.0KPa, and a wind flow (total flow of apoplexy and axis stream wind) is 7100m3/ h, primary wind pressure (apoplexy and axis stream wind
Stagnation pressure) be 19KPa；Rotary kiln end pressure is -10Pa, and kiln tail pressure is -189Pa；Kiln tail blower east kiln tail import negative pressure-
5020Pa, eastern kiln tail flow 300010m3/ h, western kiln tail import negative pressure -5020Pa, western kiln tail flow 150020m3/h；Chain grate machine
930 DEG C of 1# petticoat pipe temperature, 320 DEG C of temperature of several mouthfuls of circulating fan, cloth flatness ± 8.It lights low NO and carries out pelletizing life
Technological parameter is detected when production, testing result is that the length of flame is 14.8m, and flame temperature is 1500 DEG C, rotary kiln end
Temperature is 930 DEG C, and kiln end temperature is 1050 DEG C, and the concentration of kiln tail nitrogen oxides is 100mg/m3。
It can be seen that using the low NO of the utility model from embodiment 1-3 testing result, the length of flame is longer,
For 14.8~15.5m；Flame temperature is lower, is 1480~1500 DEG C；The concentration of kiln tail nitrogen oxides is greatly reduced, be 70~
100mg/m3, discharge standard is fully met, the utility model reduces the yield of nitrogen oxides from source, is truly realized clear
Clean production reduces enterprise's exhaust-gas treatment cost, reduces environmental pollution.
Claims (6)
1. a kind of pelletizing rotary kiln low NO, including air hose (11) and burner body (12), it is characterised in that: the combustion
The center of burner ontology (12) is equipped with cylindrical body (1), and the direction of axis line on cylindrical body (1), along cylindrical body (1) is equipped with cylinder
Shape air duct；The outside of cylindrical body (1) is equipped with the first cylinder (2) with cylindrical body (1) coaxial inner conductor, the first cylinder (2) and cylinder
Body (1) is connected by the first fan blade (3), and the gap between the first cylinder (2) and cylindrical body (1) is coke-stove gas channel；First
The outside of cylinder (2) is equipped with the second cylinder (4) with cylindrical body (1) coaxial inner conductor, and the second cylinder (4) and the first cylinder (2) are logical
It crosses the second fan blade (5) to connect, the gap between the second cylinder (4) and the first cylinder (2) is coal gas of converter channel；The second cylinder
(4) hollow cuboid air duct (6), hollow cuboid air duct (6) longitudinal direction and burner body axial line are equipped between inside and outside wall
In parallel.
2. a kind of pelletizing rotary kiln low NO according to claim 1, it is characterised in that: the cylindrical air duct by
1 large aperture cylinder (7) positioned at cylindrical body (1) center, 22~28 small-bore cylinders positioned at large aperture cylinder (7) periphery
(8) it forms.
3. a kind of pelletizing rotary kiln low NO according to claim 1, it is characterised in that: first fan blade (3)
Number be 6~10, the number of the second fan blade (5) is 14~18.
4. a kind of pelletizing rotary kiln low NO according to claim 1, it is characterised in that: first fan blade (3)
With the inclined structure setting of the second fan blade (5), and the inclined direction of the first fan blade (3) and the second fan blade (5) is opposite.
5. a kind of pelletizing rotary kiln low NO according to claim 1, it is characterised in that: the hollow cuboid wind
The number in road (6) is 35~41.
6. a kind of pelletizing rotary kiln low NO according to claim 1, it is characterised in that: the second cylinder (4)
Outer wall further include one section of extension area (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821877291.2U CN209622774U (en) | 2018-11-15 | 2018-11-15 | Pelletizing rotary kiln low NO |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821877291.2U CN209622774U (en) | 2018-11-15 | 2018-11-15 | Pelletizing rotary kiln low NO |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209622774U true CN209622774U (en) | 2019-11-12 |
Family
ID=68443943
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821877291.2U Active CN209622774U (en) | 2018-11-15 | 2018-11-15 | Pelletizing rotary kiln low NO |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209622774U (en) |
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2018
- 2018-11-15 CN CN201821877291.2U patent/CN209622774U/en active Active
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