CN108893573A - A kind of combustion optimizing system and method for rotary hearth furnace - Google Patents
A kind of combustion optimizing system and method for rotary hearth furnace Download PDFInfo
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- CN108893573A CN108893573A CN201810588309.5A CN201810588309A CN108893573A CN 108893573 A CN108893573 A CN 108893573A CN 201810588309 A CN201810588309 A CN 201810588309A CN 108893573 A CN108893573 A CN 108893573A
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- furnace
- rotary hearth
- burner
- hearth furnace
- benefit wind
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/10—Making spongy iron or liquid steel, by direct processes in hearth-type furnaces
- C21B13/105—Rotary hearth-type furnaces
Abstract
Embodiments of the present invention provide the combustion optimizing system and method for a kind of rotary hearth furnace, the rotary hearth furnace successively includes cloth area, preheating zone, reducing zone and discharge zone along furnace bottom rotation direction, the system comprises multiple benefit wind burners for being uniformly installed on end furnace roof in the preheating zone, for providing combustion-supporting gas.The present invention optimizes combustion reaction by using the benefit wind burner of special construction, while guaranteeing rotary hearth furnace process, so that being able to full combustion in preheating zone into the rotary hearth furnace flue gas before flue, prevent gas from entering flue burning, lead in gas viscous glutinous, the blocking expansion chamber of low melting point melting in dust, while improving heat utilization ratio.
Description
Technical field
The present invention relates to chemical fields, and in particular to a kind of combustion optimizing system and method for rotary hearth furnace.
Background technique
Background that this section is intended to provide an explanation of the embodiments of the present invention set forth in the claims or context.Herein
Description recognizes it is the prior art not because not being included in this section.
With the fast development of non-blast furnace smelting process, it is mating to there is rotary hearth furnace, roof furnace, tunnel oven, rotary kiln etc.
Coal-based direct reduction equipment.Wherein, rotary hearth furnace does not have a particular/special requirement due to the intensity to furnace charge itself, more because its process is short,
Low energy consumption, small investment, flexible operation, it is stable the advantages that be widely used in handling various grandidierites, the choosing of low-grade complex difficulty
The industrial circles such as mine and metallurgical iron content solid waste.
Rotary hearth furnace is made of annular siege, outboard sidewalls, furnace roof, and side wall, furnace roof are fixed, and siege is by furnace bottom driver
Structure drives circulation rotating to restore the furnace charge in furnace is added.Its burner hearth is divided into multiple control zones, including cloth area, preheating zone, also
Former area and discharge zone move furnace charge by rotary furnace tail band and pass through each heating zone.Each heating zone outboard sidewalls are not configured with
With the burner of quantity, the combustion gas being sent by pipeline controls the temperature in each area with the heat that combustion air burning generates, and produces
Raw flue gas flows to flue discharge against rotary hearth furnace direction of rotation.
Rotary hearth furnace is in process of production since the higher oxygen combustion that encounters in flue of the CO content of flue gas in flue makes
Flue temperature rises, and is easy to cause viscous glutinous, the blocking expansion chamber flue of low melting point melting in flue dust, reduces production efficiency and energy
Source utilization rate.
In view of the above-mentioned problems, the Chinese invention of Patent No. CN106197045A discloses a kind of afterheat boiler system, turns
Bottom furnace high-temperature dust-containing flue gas processing system and method, the patent in sedimentation furnace mainly by being arranged external smoke inlet, from outer
Portion is passed through high-temperature flue gas and is diluted processing to inside smoke, and then reduces dust content and harmful components concentration in flue gas,
And prevent sedimentation furnace, high temperature heat exchanging part and low-temperature heat exchange part dust stratification from reducing the several of fume treatment auxiliary and flue blockage
Rate, while mitigating corrosion of the flue gas to sedimentation furnace, high temperature heat exchanging part and low-temperature heat exchange part and flue etc..
However, above-mentioned carry out CO content in smoke of the processing of harmful substance there is no solution into flue using dilution method
High and more energy waste problem.
Summary of the invention
In order to solve or part solves above-mentioned technical problem, the embodiment of the present invention proposes a kind of burning optimization of rotary hearth furnace
System escapes into flue gas containing a large amount of CO for rotary hearth furnace, and gas enters flue and air catalytic oxidation burns, and causes cigarette
This excessively high problem of channel temp reduces the CO content that rotary hearth furnace enters flue gas in flue, on the one hand significantly improves rotary hearth furnace
Utilization rate of waste heat, on the other hand reduce in flue that temperature is excessively high, be easy to cause low melting point melting in flue dust viscous glutinous, stifled
The problem of filling in expansion chamber flue, reducing production efficiency and energy utilization rate.
According to the present invention embodiment in a first aspect, propose a kind of combustion optimizing system of rotary hearth furnace, the rotary hearth furnace
It successively include cloth area, preheating zone, reducing zone and discharge zone along furnace bottom rotation direction, the system comprises：
Multiple benefit wind burners for being uniformly installed on the preheating zone furnace roof, for providing combustion-supporting gas.
In some possible embodiments, wherein the benefit wind burner from furnace roof be downwards in long tube structure, the benefit wind
The tube wall and/or tube bottom of burner are uniformly distributed multiple small nozzles, and wherein each described small nozzle has switch valve.
In some possible embodiments, wherein further include wind deflector, the wind deflector is fixed on the preheating zone
Furnace roof has gap close to the position for mending wind burner between the wind deflector and the furnace bottom, furnace wall.
In some possible embodiments, wherein above system further includes：
Flue gas inspection device, the flue gas inspection device are installed below the benefit wind burner, are used for real-time monitoring flue gas
One of or a variety of content of predetermined substance；
The predetermined substance includes all possible substance generated in rotary hearth furnace flue gas, including but not limited to CO, oxygen,
Carbon dioxide, sulfur dioxide.
Control climate unit, one or more content of predetermined substance for detecting according to control the benefit wind and burn
The unlatching quantity of mouth and/or the small nozzle.
Optionally, above system further includes temperature-detecting device, the temperature in wind region is mended for real-time detection, further
Ground, above-mentioned control climate unit control the unlatching quantity of the benefit wind burner and/or the small nozzle according to the temperature.
In some possible embodiments, wherein above system further includes：
Gas flow monitoring device, for monitoring the gas flow for passing through the small nozzle；
It is blown pressure test device, for monitoring the pressure in the benefit wind burner；
Wherein, when the gas flow monitored becomes smaller but pressure becomes larger, judge that the small nozzle blocks, it is described
It mends wind burner and increases the blowing pressure dredging small nozzle.
It optionally, is 50 °~75 ° with furnace roof angle wherein the benefit wind nozzle is tilted along rotary hearth furnace rotation direction.
It optionally, is 40 °~90 ° with furnace roof angle wherein the wind deflector is tilted to wind burner direction is mended.
Optionally, the system also includes flue, the flue is communicated with rotary hearth furnace preheating zone initial segment, the flue gas from
The preheating zone flows to flue and rotary hearth furnace is discharged.
Optionally, the flue gas inspection device is away from 0.04~0.09m of furnace bottom height.
The second aspect of embodiment according to the present invention provides a kind of utilization aforementioned present invention embodiment first aspect times
The burning optimization method of rotary hearth furnace described in one, the rotary hearth furnace along furnace bottom rotation direction successively include cloth area, preheating zone, also
Former area and discharge zone, the method includes：
Combustion-supporting gas is injected in the rotary hearth furnace by multiple benefit wind burners for being uniformly installed on the preheating zone furnace roof.
In some possible embodiments, wherein the benefit wind burner from furnace roof be downwards in long tube structure, the benefit wind
The tube wall and/or tube bottom of burner are uniformly distributed multiple small nozzles, and the combustion-supporting gas is uniform by the multiple small nozzle
Inject the rotary hearth furnace.
In some possible embodiments, wherein the preheating zone furnace roof is solid close to the position for mending wind burner
Surely there is wind deflector, the combustion-supporting gas inside the injection rotary hearth furnace merges to form turbulent flow with abundant with flue gas at the wind deflector
Burning.
In some possible embodiments, wherein the method also includes：
One of flue gas described in real-time monitoring or a variety of content of predetermined substance；
The benefit wind burner and/or the small-sized spray are controlled according to the one or more content of predetermined substance detected
The unlatching quantity of mouth.
In some possible embodiments, wherein the method also includes：
Real-time monitoring passes through the gas flow of the small nozzle；And
Pressure in benefit wind burner described in real-time monitoring；
Wherein, when the gas flow monitored becomes smaller but pressure becomes larger, judge that the small nozzle blocks, it is described
It mends wind burner and increases the blowing pressure dredging small nozzle.
It is exactly based on the combustion optimizing system and method for rotary hearth furnace provided by embodiment of the present invention, i.e., by using spy
The benefit wind burner and wind deflector of different structure, optimize the combustion reaction of rotary hearth furnace, to will enter mistake in the flue gas of flue
Surplus CO carries out this technical solution of full combustion in rotary hearth furnace preheating zone.On the one hand it solves and is escaped from rotary hearth furnace and enter cigarette
The gas in road contains a large amount of CO, and gas enters flue and air catalytic oxidation and burns, and causes that floss hole temperature is excessively high, dust melting
Sedimentation causes expansion chamber to block this technical problem.It on the other hand, can be fast by superfluous CO in rotary hearth furnace preheating zone full combustion
Speed preheats carbonaceous pelletizing, to finally play the technical effect for making full use of heat.Furthermore it is noted that this
Invention is by carrying out the clean-burning technical solution of CO close to the preheating zone of floss hole, while reaching above-mentioned technical effect
It ensure that rotary hearth furnace requires to require in this technique for having certain reducing atmosphere in reducing zone；Further, of the invention
Whether can also be deposited according to being arranged in the gas flow monitoring device and blowing pressure test device monitoring burner mended in wind burner
It in congestion situations and is dredged, significantly improves the service life for mending wind burner.In addition, the present invention can also be according to flue gas inspection
Equipment on-line monitors the concentration of the predetermined substances such as CO, oxygen, is controlled by control climate unit and mends wind burner and/or small nozzle
Unlatching quantity, and then by the CO concentration and oxygen concentration of rotary hearth furnace preheating zone control in the certain threshold for being conducive to pre- thermal response
In value, production efficiency is further significantly improved.
Detailed description of the invention
The following detailed description is read with reference to the accompanying drawings, above-mentioned and other mesh of exemplary embodiment of the invention
, feature and advantage will become prone to understand.In the accompanying drawings, if showing by way of example rather than limitation of the invention
Dry embodiment, wherein：
Fig. 1 shows the rotary hearth furnace top view according to an embodiment of the present invention with optimum burningsystem.
Fig. 2 shows the radial direction perspectives of the rotary hearth furnace preheating zone according to an embodiment of the present invention with optimum burningsystem
Figure.
Fig. 3 shows rotating along furnace bottom for the rotary hearth furnace preheating zone according to an embodiment of the present invention with optimum burningsystem
The perspective view in direction.
In the accompanying drawings, identical or corresponding label indicates identical or corresponding part.
Appended drawing reference：Cloth area of I area-；II area-preheating zone；III-reducing zone；IV-discharge zone；11- flue；12- keeps out the wind
Plate；13- mends wind burner；14- flue gas inspection device；15- small nozzle；16- furnace bottom；17- burner.
Specific embodiment
The principle and spirit of the invention are described below with reference to several illustrative embodiments.It should be appreciated that providing this
A little embodiments are used for the purpose of making those skilled in the art can better understand that realizing the present invention in turn, and be not with any
Mode limits the scope of the invention.On the contrary, these embodiments are provided so that this disclosure will be more thorough and complete, and energy
It is enough that the scope of the present disclosure is completely communicated to those skilled in the art.
The embodiment of the present invention provides a kind of optimum burningsystem of rotary hearth furnace, so that existing into the rotary hearth furnace flue gas before flue
Preheating zone is able to full combustion.As shown in Figure 1, the inner cavity of rotary hearth furnace is divided into I area-cloth according to the direction of rotation of material
Area, II area-preheating zone, III area-reducing zone and IV area-discharge zone.Material enters rotary hearth furnace by cloth area, in furnace rotation by
After heat reacts, rotary hearth furnace is discharged by discharge zone.Flue gas flows to preheating zone from reducing zone, then flows to flue side by side by preheating zone
Rotary hearth furnace out.Flue gas circulating direction is referred to by the arrow that flue is directed toward in preheating zone in figure.
It as shown in Figures 1 to 3, mainly include that multiple be uniformly installed on turns the present embodiment provides the optimum burningsystem of rotary hearth furnace
The benefit wind burner 13 of end furnace roof in the furnace preheating zone of bottom, for providing combustion-supporting gas.
Wherein, the middle end tips uniform crossover in rotary hearth furnace preheating zone is distributed multiple benefit wind burners, and wherein each is mended
Wind burner is both provided with switch valve.
Optionally, the internal diameter for mending wind burner is 0.4~0.8m, and multiple benefit wind burners are arranged as one along rotary hearth furnace is radially uniform
Row.
Optionally, when rotary hearth furnace along the circumferential direction preheating zone furnace roof width be B when, be arranged with along rotary hearth furnace rotation direction
0.1~0.75B row mends wind burner, and adjacent two rows of distances mended between wind burner are 0.06~0.87B.
Optionally, most inner side and outermost benefit wind burner are radially disposed in away from rotary hearth furnace inner sidewall/outer panel along rotary hearth furnace
Distance be 0.15~0.45m, preferably 0.22~0.35m.
Optionally, the flow for mending wind burner is 150~2700Nm3/ h, preferably 350~2160Nm3/h。
Optionally, the benefit wind burner uses heat-resisting material to bear high-temperature work environment, and preferably resistance to 1200~1400
DEG C high-temperature material.
In some embodiments, above-mentioned benefit wind burner be vertical long tube structure, the side of hollow long tube structure and/or
Bottom surface is uniformly distributed multiple small nozzles from top to bottom, abundant to ensure to enter CO burning in the flue gas before flue.Optionally, small
Type nozzle inside diameter is 0.1~0.3m, and each small nozzle has respective air valve switch.
Optionally, the benefit wind burner with long tube structure is tilted along rotary hearth furnace rotation direction, and the angle with furnace roof is 50
~75 °, preferably 63~72 ° facilitate combustion-supporting gas using the benefit wind burner of incline structure and are come into full contact with inner flue gas of the stove
With react.
In some embodiments, gas flow monitoring device is both provided on each small nozzle, it is logical for monitoring
Cross the gas flow of small nozzle.Each is mended wind burner and is internally provided with blowing air pressure monitoring device, mends wind burning for monitoring
Pressure size in mouth.If can speculate that small nozzle has blocking feelings when the gas flow detected becomes smaller but pressure is larger
Condition mends the small nozzle dredging for being blown pressure and combustion-supporting gas flow for obstruction of wind burner by increasing.
In some embodiments, above system further includes wind deflector, and the furnace roof which is fixed on preheating zone is close
The position for mending wind burner, has gap between the wind deflector and the furnace bottom, furnace wall.
More specifically, the wind deflector be located at mend wind burner close to the side in cloth area, and along the rotary hearth furnace direction of motion away from
Thus 0.5~1.5m of flue can be used for flue gas convolution, form turbulent flow, by the complete CO full combustion of unreacted, reduce heat damage
It loses and barrier part high-temperature flue gas is directly entered flue.
Optionally, which uses airtight, and resistance to 1200~1400 DEG C of high-temperature materials are made.
Optionally, which tilts to wind burner direction is mended, and is 40~90 ° with furnace roof angle, preferably 51~
81°。
In some embodiments, which further includes flue gas inspection device 14, and the flue gas inspection device is installed on institute
It states and mends below wind burner, for one of real-time monitoring flue gas or a variety of content of predetermined substance.
Optionally, as shown in Figure 1, being provided with multiple groups flue gas inspection device on the outboard sidewalls of rotary hearth furnace preheating zone.It is optional
Ground, as shown in Fig. 2, the flue gas inspection equipment 14 is fixed in the position away from 0.04~0.09m of furnace bottom height, to guarantee that gas takes
The accuracy of sample avoids equipment high temperature from burning simultaneously.
In some embodiments, which further includes control climate unit (not shown in figures), for according to institute
State the unlatching quantity that the one or more content of predetermined substance detected control the benefit wind burner and/or the small nozzle.
Specifically, the opening and closing of the switch valve of wind burner and/or small nozzle is mended in the control of control climate unit.
In some embodiments, which further includes gas flow monitoring device (not shown in figures), for supervising
Survey the gas flow for passing through the small nozzle.Optionally, which is set to the small-sized spray of all/part
At the air outlet of mouth.
In some embodiments, which further includes blowing pressure test device (not shown in figures), for supervising
Survey the pressure in the benefit wind burner；Specifically, the benefit wind that the blowing pressure test device is set to each long tube structure is burnt
Inside mouth.
Further, when the above-mentioned gas flow monitored becomes smaller but pressure becomes larger, there are small nozzle generations for judgement
The case where blocking, the benefit wind burner increase blowing pressure and dredge the small nozzle.
The embodiment of the invention also provides a kind of burning optimization method of rotary hearth furnace, the rotary hearth furnace is along furnace bottom rotation direction
Successively include cloth area, preheating zone, reducing zone and discharge zone, the method includes：
Combustion-supporting gas is injected in the rotary hearth furnace by multiple benefit wind burners for being uniformly installed on the preheating zone furnace roof.
In some embodiments, the benefit wind burner from furnace roof be downwards in long tube structure, it is described mend wind burner tube wall and/
Or tube bottom is uniformly distributed multiple small nozzles, the combustion-supporting gas is uniformly injected by the multiple small nozzle described turns bottom
Furnace.
In some embodiments, preheating zone furnace roof is being fixed with wind deflector close to the position for mending wind burner, described
Combustion-supporting gas inside injection rotary hearth furnace merges to form turbulent flow with full combustion with flue gas at the wind deflector.
In some embodiments, this method further includes：One of flue gas described in real-time monitoring or a variety of predetermined substances
Content；And the benefit wind burner and/or described small-sized is controlled according to one or more content of predetermined substance for detecting
The unlatching quantity of nozzle.
In some embodiments, this method further includes：The gas flow that real-time monitoring passes through small nozzle；And in real time
Monitor the pressure in the benefit wind burner；Wherein, when the gas flow monitored becomes smaller but pressure becomes larger, judge described small-sized
Nozzle blocks, and the benefit wind burner increases blowing pressure and dredges the small nozzle.
The combustion optimizing system and method for rotary hearth furnace provided by embodiment through the invention, i.e., by using special knot
The benefit wind burner and wind deflector of structure, optimize the combustion reaction of rotary hearth furnace, superfluous in the flue gas of flue to that will enter
CO carries out this technical solution of full combustion in rotary hearth furnace preheating zone.On the one hand it solves and is escaped from rotary hearth furnace and enter flue
Gas contains a large amount of CO, and gas enters flue and air catalytic oxidation and burns, and causes that floss hole temperature is excessively high, dust melting sedimentation
Expansion chamber is caused to block this technical problem.On the other hand, by superfluous CO in rotary hearth furnace preheating zone full combustion, can rapidly by
Carbonaceous pelletizing is preheated, to finally play the technical effect for making full use of heat.Furthermore it is noted that of the invention
By carrying out the clean-burning technical solution of CO, guarantee while reaching above-mentioned technical effect close to the preheating zone of floss hole
Rotary hearth furnace requires to require in this technique for having certain reducing atmosphere in reducing zone；Further, the present invention may be used also
It whether there is resistance according to being arranged in the gas flow monitoring device and blowing pressure test device monitoring burner mended in wind burner
Plug situation is simultaneously dredged, and the service life for mending wind burner is significantly improved.In addition, the present invention can also be according to flue gas inspection equipment
The concentration of CO, the predetermined substances such as oxygen is monitored online, is controlled by control climate unit and mends opening for wind burner and/or small nozzle
Quantity is opened, and then the CO concentration and oxygen concentration of rotary hearth furnace preheating zone are controlled in the specific threshold for being conducive to pre- thermal response
It is interior, further significantly improve production efficiency.
Claims (10)
1. a kind of combustion optimizing system of rotary hearth furnace, the rotary hearth furnace along furnace bottom rotation direction successively include cloth area, preheating zone,
Reducing zone and discharge zone, the system comprises：
Multiple benefit wind burners for being uniformly installed on end furnace roof in the preheating zone, for providing combustion-supporting gas.
2. system according to claim 1, wherein the benefit wind burner from furnace roof be downwards in long tube structure, the benefit wind
The tube wall and/or tube bottom of burner are uniformly distributed multiple small nozzles, each described small nozzle has switch valve.
3. system according to claim 1, wherein it further include the wind deflector for being fixed on the furnace roof of the preheating zone, it is described
Wind deflector is located at the benefit wind burner close to the side in the cloth area, and has gap between the furnace bottom, furnace wall.
4. system according to claim 2, wherein further include：
Flue gas inspection device, the flue gas inspection device is installed below the benefit wind burner, in real-time monitoring flue gas
One or more content of predetermined substance；
Control climate unit, one or more content of predetermined substance for detecting according to control the benefit wind burner
And/or the unlatching quantity of the small nozzle.
5. system according to claim 2, wherein further include：
Gas flow monitoring device, for monitoring the gas flow for passing through the small nozzle；
It is blown pressure test device, for monitoring the pressure in the benefit wind burner；
Wherein, when the gas flow monitored becomes smaller but pressure becomes larger, judge that the small nozzle blocks, the benefit wind
Burner increases blowing pressure and dredges the small nozzle.
6. a kind of burning optimization method using any rotary hearth furnace of claim 1-5, the rotary hearth furnace are rotated along furnace bottom
Direction successively includes cloth area, preheating zone, reducing zone and discharge zone, the method includes：
Combustion-supporting gas is injected in the rotary hearth furnace by multiple benefit wind burners for being uniformly installed on the preheating zone furnace roof.
7. according to the method described in claim 6, wherein, the benefit wind burner from furnace roof be downwards in long tube structure, the benefit wind
The tube wall and/or tube bottom of burner are uniformly distributed multiple small nozzles, and the combustion-supporting gas is uniform by the multiple small nozzle
Inject the rotary hearth furnace.
8. according to the method described in claim 6, wherein, the preheating zone furnace roof is fixed close to the position for mending wind burner
There is wind deflector, the combustion-supporting gas inside the injection rotary hearth furnace merges to form turbulent flow sufficiently to fire with flue gas at the wind deflector
It burns.
9. according to the method described in claim 7, wherein, further including：
One of flue gas described in real-time monitoring or a variety of content of predetermined substance；
The benefit wind burner and/or the small nozzle are controlled according to the one or more content of predetermined substance detected
Open quantity.
10. according to the method described in claim 7, wherein, further including：
Real-time monitoring passes through the gas flow of the small nozzle；And
Pressure in benefit wind burner described in real-time monitoring；
Wherein, when the gas flow monitored becomes smaller but pressure becomes larger, judge that the small nozzle blocks, the benefit wind
Burner increases blowing pressure and dredges the small nozzle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810588309.5A CN108893573A (en) | 2018-06-08 | 2018-06-08 | A kind of combustion optimizing system and method for rotary hearth furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810588309.5A CN108893573A (en) | 2018-06-08 | 2018-06-08 | A kind of combustion optimizing system and method for rotary hearth furnace |
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| CN106636529A (en) * | 2016-10-28 | 2017-05-10 | 江苏省冶金设计院有限公司 | System and method for processing vanadium-titanium magnetite |
| CN107988453A (en) * | 2017-12-29 | 2018-05-04 | 江苏省冶金设计院有限公司 | A kind of rotary hearth furnace |
| CN208717365U (en) * | 2018-06-08 | 2019-04-09 | 上海宝幢新能源科技有限公司 | A kind of combustion optimizing system of rotary hearth furnace |
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|---|---|---|---|---|
| US5989019A (en) * | 1996-08-15 | 1999-11-23 | Kabushiki Kaisha Kobe Seiko Sho | Direct reduction method and rotary hearth furnace |
| US5899688A (en) * | 1996-09-06 | 1999-05-04 | Demag Italimpianti S.P.A. | Rotary hearth furnace |
| CN1186863A (en) * | 1997-11-27 | 1998-07-08 | 北京兰斯节能技术开发中心 | Bead iron producing process in rotary hearth furnace and its separating method |
| JP2001279314A (en) * | 2000-03-28 | 2001-10-10 | Kawasaki Steel Corp | Method for producing reduced metal from metal- containing material |
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