CN205642033U - Waste heat recovery system is united to rotary hearth furnace - Google Patents
Waste heat recovery system is united to rotary hearth furnace Download PDFInfo
- Publication number
- CN205642033U CN205642033U CN201620358676.2U CN201620358676U CN205642033U CN 205642033 U CN205642033 U CN 205642033U CN 201620358676 U CN201620358676 U CN 201620358676U CN 205642033 U CN205642033 U CN 205642033U
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- CN
- China
- Prior art keywords
- cooling
- rotary hearth
- heat
- hearth furnace
- flue gas
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/15—On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply
Abstract
The utility model discloses a waste heat recovery system is united to rotary hearth furnace, include the deposit room be connected with the rotary hearth furnace top and the DRI cooling furnace who is connected with the rotary hearth furnace bottom, the deposit room passes through sedimentation pipe to be connected with exhaust -heat boiler, and among the flue gas entering air heat exchanger in the exhaust -heat boiler, the flue gas among the air heat exchanger is in the sack cleaner gets into the draught fan, and the flue gas of draught fan gets into the chimney of discharging fume, the chimney of discharging fume passes through the pipeline to be connected with the high pressure positive blower, and at the high pressure positive blower and discharge fume and be equipped with oxygen detection device, oxygen processing apparatus and air supplement unit in proper order on the pipeline between the chimney, the inspiratory cooling air of high pressure positive blower gets into DRI cooling furnace's cooling air ring way, passes the wind channel and carries out the heat transfer with heat material in the DRI cooling furnace, and the gas after the heat transfer passes through the pipeline and gets into the deposit room. The utility model discloses realized simultaneously that the high temperature flue gas that produces rotary hearth furnace technology carries out waste heat recovery with the heat material, but hot DRI cooling furnace as coolant, being sent into to the partial low temperature flue gas self -loopa after the purification, carrying out the heat transfer cooling to the heat material, the running cost is low.
Description
Technical field
The present invention relates to rotary hearth furnace associating residual neat recovering system, belong to technical field of mechanical equipment.
Background technology
Rotary hearth furnace (Rotary Hearth Furnace) technique can be used to pre-reduced iron Ore, it is also possible to processes Metallurgical Factory and produces
Raw dust, and the Metallurgical Solid Wastes etc. of other iron content, chromium, zinc.Rotary hearth furnace with carbon-burdened pellet or agglomerate as raw material,
Under 1250～1350 DEG C of hot environments, the metal-oxide in carbonaceous pelletizing, by carbon fast restore, generates metallized pellet.
The prereduced burden material dump temperature that rotary hearth furnace process produces, typically at about 1000 DEG C, is released outside stove by spiral discharging machine.Turn
End furnaceman's skill the most also produces high-temperature flue gas, and it has taken away the heat of rotary hearth furnace～50%, and flue-gas temperature of coming out of the stove typically exists
About 1100 DEG C, and exhaust gas volumn is relatively big, sensible heat content is high.Owing to high-temperature flue gas and the high-temperature material of rotary hearth furnace are all taken away
More energy, considers from reducing rotary hearth furnace process energy consumption angle, it is achieved the two-part energy of sufficiently effective recovery, will
Energy-saving and cost-reducing to rotary hearth furnace process has important development meaning.
Present stage, for rotary hearth furnace waste heat recovery, too much concentrates on the purification to high-temperature flue gas and waste heat recovery aspect, to
Reduce rotary hearth furnace energy consumption consumption indicators, such as patent CN 202361822U, CN 103063044A, CN 105135898A
Deng described, main by waste heat boiler recovered flue gas heat, produce high-temperature steam, and utilize steam turbine power generation.At this base
Consider the scheme that rotary hearth furnace heat material is reclaimed on plinth, more be confined to traditional horizontal cylinder cooler, due to comprehensively
The recovery thermal efficiency is low, and process energy consumption is higher, and equipment takes up an area and investment is big, it is difficult to meet the life of energy-saving and cost-reducing low-carbon environment-friendly
Produce target call.
Considering that the heat material that rotary hearth furnace produces needs to prevent secondary oxidation, and dump temperature is higher, waste heat recovery is worth height,
The dry coke quenching technique that contrast is the most ripe, has technical staff to propose, with nitrogen as cooling wind medium, to cool down at vertical counterflow
Realizing heat exchange in device, through dedusting, high temperature nitrogen carries out heat exchange, the high-temperature steam of generation in waste heat boiler, uses steamer
Machine carries out generating and recovers energy, and nitrogen circulation utilizes, as described in patent CN 102183154A.Under this technology path,
Needing to be that nitrogen cooling heat transferring implemented by heat material, another increasing newly arranges one-time dedusting, waste heat boiler and turbine generating system, with
And final dusting facility, equipment investment is high, and cost recovery is high.
At present in terms of the energy regenerating that rotary hearth furnace waste heat recovery is concentrated mainly on high-temperature flue gas: utilize waste heat boiler to return
Receive flue gas heat, produce high-temperature steam, reclaim heat by the mode of steam turbine power generation.Rotary hearth furnace heat material can be by horizontal
Cylinder cooler carries out waste heat recovery, but horizontal cylinder cooler heat recovery efficiency is relatively low, and takes up an area and invest relatively big, real
Poor by effect, it is difficult to realize improving the integrated heat efficiency of rotary hearth furnace and reducing the target call of process energy consumption.
On the basis of the energy regenerating to high-temperature flue gas, use for reference dry coke quenching processing technology routine feature with nitrogen as
Cooling wind medium, realizes the heat exchange to heat material in vertical counterflow cooler, and through dedusting, high temperature nitrogen is at waste heat boiler
In carry out heat exchange, the high-temperature steam of generation, carry out generating with steam turbine and recover energy, nitrogen circulation utilize；To heat
Material carry out energy regenerating, although process route is the most ripe, higher to UTILIZATION OF VESIDUAL HEAT IN degree, but two set dedustings, purification and
Residual heat boiler for exchanging heat system investments is relatively big, and nitrogen production input cost is high, and economy is poor.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the present invention provides a kind of rotary hearth furnace associating waste heat recovery
System, is simultaneously achieved the high-temperature flue gas producing rotary hearth furnace process and heat material carries out waste heat recovery, and the part after purification is low
Temperature flue gas is capable of self-circulating, as cooling medium, sends in hot DRI cooling stove, heat material carries out heat exchange cooling, and cooling is situated between
Matter convenient sources, operating cost is low.
Technical scheme: for solve above-mentioned technical problem, the present invention a kind of rotary hearth furnace associating residual neat recovering system, including with
Expansion chamber and the DRI that is connected with rotary hearth furnace bottom that rotary hearth furnace top connects cool down stove, described expansion chamber by sedimentation pipe and
Waste heat boiler connects, and the flue gas in waste heat boiler enters in air heat exchanger, and the flue gas in air heat exchanger is through bag-type dust
Device enters in air-introduced machine, and the flue gas of air-introduced machine enters chimney；Chimney is connected with high pressure positive blower by pipeline,
Oxygen detection device, oxygen processing means and making-up air device, high pressure it is sequentially provided with on pipeline between high pressure positive blower and chimney
The cooling wind that blower fan sucks enters the bottom of DRI cooling stove, carries out heat exchange with the heat material in DRI cooling stove, heat exchange
Gas enters expansion chamber by pipeline.
As preferably, in described waste heat boiler, the steam after heat exchange is sent in steam turbine, and in steam turbine, the water of cooling enters
In cold doubtful device, condensed water is sent in waste heat boiler by condenser by kinetic pump.
As preferably, between described oxygen processing means and high pressure positive blower, it is provided with the first electromagnetic valve, making-up air device and high pressure positive blower
Between be provided with the second electromagnetic valve, the first electromagnetic valve and the second electromagnetic valve and be connected with controller, control the first electricity by controller
Magnet valve and the second electromagnetic valve so that the gas oxygen content requirement that high pressure positive blower sucks controls below 2%；When oxygen content surpasses
After 5% time, by first electromagnetic valve connect oxygen processing means to cooling gas burn, again heat exchange cool down (after heat exchange
Temperature ＜ 130 DEG C), to realizing reducing the oxygen content purpose of gas；When oxygen content is between 2～5%, by the second electromagnetism
The making-up air device that valve connects, from outside Nitrogen pipe network input nitrogen, it is achieved oxygen content in dilution cooling gas, realizes adjusting simultaneously
The purpose of whole gross pressure.
As preferably, described DRI cooling stove includes blanking section and the cooling section that charging aperture is connected with charging aperture, described cold
But the side of section is arranged over the exhaust duct communicated with air draft circuit, it is achieved after heat exchange, steam can enter sedimentation by exhaust duct
Room, is provided with cold burden bed in cooling section, cold burden bed is supported by support means, and the lower end of cooling section is provided with what cooling wind entered
Air inlet；Heat material enters cooling section by charging aperture, drops on cold burden bed, and the heat material heat further on cold burden bed is handed over
Discharging from discharge gate after changing, during heat material falls, cooling wind is bottom-up to be carried out with hot material after heat exchange by row
Airduct is discharged.
As preferably, described cooling bed for class fence type grate plate steel construction, material feature is heat-resistant antifriction；Fence type grate plate
It is easy to nitrogen run from bottom to top；Good cooling results, follow-up cold burden discharge apparatus type selecting low cost, it is simple to the conveying of cold burden.
In circulating cooling flue gas, oxygen content requires to control below 2%, to avoid cooling down too high oxygen level in gas, at DRI
Hot DRI is caused secondary oxidation by cooling stove, makes metallic iron in DRI regenerate FeO, reduce DRI metallization
Rate, and the smelting technology energy consumption of follow-up DRI is impacted, add coke consumption and the power consumption of smelting system.Work as oxygen
When content is higher, can by first electromagnetic valve connect oxygen processing means to cooling gas burn, again heat exchange cooling (change
Temperature ＜ 130 DEG C after heat), to realizing reducing the oxygen content purpose of gas；When oxygen content is between 2～5%, can pass through
The making-up air device that second electromagnetic valve connects, from outside Nitrogen pipe network input nitrogen, it is achieved oxygen content in dilution cooling gas, with
Shi Shixian adjusts the purpose of gross pressure.
The hot DRI material of about 1000 DEG C runs in chiller from top to bottom, and cooling flue gas runs from bottom to top,
Carrying out forced heat-exchanging on cooling bed, cooling bed for class fence type grate plate steel construction, material feature is heat-resistant antifriction；Fence type
Grate plate is easy to nitrogen and is run from bottom to top；Due to good cooling results, follow-up cold burden discharge apparatus type selecting cost is relatively low, it is simple to
The conveying of cold burden.
Beneficial effect: the rotary hearth furnace associating residual neat recovering system of the present invention, has the advantage that
(1) it is simultaneously achieved the high-temperature flue gas that rotary hearth furnace process is produced and heat material carries out waste heat recovery, the portion after purification
Divide low-temperature flue gas capable of self-circulating, as cooling medium, send in hot DRI cooling stove, heat material is carried out heat exchange cooling, cold
But medium sources is convenient, and operating cost is low；
(2) at hot DRI cooling stove, heat material is carried out the cold cycle flue gas of heat exchange, is incorporated to the main cigarette of rotary hearth furnace by pipeline
Road, with the cross over pipe of expansion chamber entrance, utilizes the one-time dedusting of rotary hearth furnace flue collector high-temperature flue gas, final dusting, cloth bag
Cleaner unit purifies, and decreases the dedusting in the case of cooling down, cleaning equipment investment individually with nitrogen circulation；
(3) at hot DRI cooling stove, heat material is carried out the cold cycle flue gas of heat exchange, is incorporated to rotary hearth furnace flue collector and sedimentation
In the cross over pipe of chamber inlet, utilize waste heat boiler and the steam turbine power generation facility of rotary hearth furnace flue collector high-temperature flue gas, decrease
Waste heat recovery in the case of cooling down individually with nitrogen circulation and generating, the investment of grid-connection device；
(4) at hot DRI cooling stove, heat material is carried out the cold cycle flue gas of heat exchange, flue gas flow adjusting means controls
Flow, with satisfied cooling stove to cold cycle flue gas intensity of cooling requirement；By oxygen analysis residual to flue gas and oxygen processing means,
The residual oxygen secondary oxidation to heat material in low-temperature flue gas can be effectively prevent；
(5) when exhaust gas volumn is more unstable, it is connected with outside Nitrogen pipe network by mending nitrogen and regulator, inputs nitrogen
Cool down the heat material in hot DRI cooling stove, and at the high temperature fume dust removal being connected with flue collector, purification and exhaust heat recovery power generation
Facility is implemented dedusting, purification and cogeneration.
Accompanying drawing explanation
Fig. 1 is the principle schematic of the present invention.
Fig. 2 is the structural representation of the present invention.
Fig. 3 is the structural representation of DRI cooling stove.
Detailed description of the invention
As shown in Figure 1 to Figure 3, a kind of rotary hearth furnace of present invention associating residual neat recovering system, including with rotary hearth furnace 1 top
The expansion chamber 3 connected and the DRI that is connected with rotary hearth furnace 1 bottom cool down stove 2, described expansion chamber 3 by sedimentation pipe 4 and
Waste heat boiler 5 connects, and the flue gas in waste heat boiler 5 enters in air heat exchanger 6, and the flue gas in air heat exchanger 6 enters
Crossing sack cleaner 7 and enter in air-introduced machine 8, the flue gas of air-introduced machine 8 enters chimney 9；Chimney passes through pipeline
Be connected with high pressure positive blower 12, the pipeline between high pressure positive blower 12 and chimney 9 is sequentially provided with oxygen detection device,
Oxygen processing means 10 and making-up air device 11, the cooling wind that high pressure positive blower 12 sucks enters the bottom of DRI cooling stove 2, with
Heat material in DRI cooling stove 2 carries out heat exchange, and the gas of heat exchange enters expansion chamber 3 by pipeline.
In the present invention, during in described waste heat boiler 5, steam after heat exchange sends into steam turbine 5-1, steam turbine 5-1 with
Generating set 5-2 connects, during in steam turbine 5-1, the water of cooling enters cold doubtful device 5-3, and the condensed water in cold doubtful device 5-3
Entering in condensing tower 5-5, condensed water is sent in condenser 5-3 by condensing tower 5-5 by cooling pump 5-6, condenser
Condensed water is sent in waste heat boiler 5 by 5-3 by kinetic pump 5-4.
In the present invention, the first electromagnetic valve, making-up air device 11 it are provided with between described oxygen processing means 10 and high pressure positive blower 12
And it is provided with the second electromagnetic valve, the first electromagnetic valve and the second electromagnetic valve between high pressure positive blower 12 to be connected with controller, by control
Device processed controls the first electromagnetic valve and the second electromagnetic valve so that the gas oxygen content that high pressure positive blower 12 sucks is below 2%；When
When oxygen content is more than 5%, cooling gas is burnt by the oxygen processing means connected by the first electromagnetic valve, heat exchange cooling again；
When oxygen content is between 2～5%, the making-up air device connected by the second electromagnetic valve, will from outside Nitrogen pipe network input nitrogen
Oxygen is diluted.
In the present invention, described DRI cooling stove includes blanking section and the cooling section that charging aperture 21 is connected with charging aperture 21,
The side of described cooling section is provided with the exhaust duct communicated with air draft circuit 24, and after heat exchange, steam enters sedimentation by exhaust duct
Room 3, is provided with cold burden bed 23 in cooling section, cooling bed 23 is class fence type grate plate steel construction, and cold burden bed 23 is by supporting
Device supports, and the lower end of cooling section is provided with the air inlet that cooling wind enters；Heat material enters cooling section by charging aperture, falls into
On cold burden bed 23, discharge from discharge gate 22 after the further heat exchange of heat material on cold burden bed, in the mistake that heat material falls
Cheng Zhong, cooling wind is bottom-up and hot material carry out heat exchange after discharged by exhaust duct.
In use, the high-temperature flue gas in rotary hearth furnace 1 enters expansion chamber 3 by pipeline to the present invention, after sedimentation pipe 4
Entering in waste heat boiler 5, with the recirculated water heat exchange in waste heat boiler 5, produce steam in waste heat boiler 5, water steams
Gas enters in steam turbine and generates electricity, and in waste heat boiler 5, the high-temperature flue gas after heat exchange enters control heat exchanger, to air heat exchanger
Cold combustion air in 6 is heated into hot combustion air so that the temperature of high-temperature flue gas is down to less than 160 DEG C, and flue gas entered
Entering chimney 9 after sack cleaner 7 dedusting, the flue gas part in chimney 9 passes through high-pressure blast through piping
Machine 12 enters DRI cooling stove 2 and heat material is carried out heat exchange, and the gas after heat exchange enters expansion chamber 3 by pipeline.
The above is only the preferred embodiment of the present invention, it should be pointed out that: for those skilled in the art
For, under the premise without departing from the principles of the invention, it is also possible to make some improvements and modifications, these improvements and modifications are also
Should be regarded as protection scope of the present invention.
Claims (5)
1. a rotary hearth furnace associating residual neat recovering system, it is characterised in that: include the expansion chamber being connected with rotary hearth furnace top
With the DRI being connected with rotary hearth furnace bottom cools down stove, described expansion chamber is connected with waste heat boiler by sedimentation pipe, waste heat boiler
In flue gas enter in air heat exchanger, the flue gas in air heat exchanger in sack cleaner enters air-introduced machine, air-introduced machine
Flue gas enter chimney；Chimney is connected with high pressure positive blower, between high pressure positive blower and chimney by pipeline
Pipeline on be sequentially provided with oxygen detection device, oxygen processing means and making-up air device, the cooling wind that high pressure positive blower sucks enters
Heat material in the bottom of DRI cooling stove, with DRI cooling stove carries out heat exchange, and the gas of heat exchange enters expansion chamber by pipeline.
Rotary hearth furnace the most according to claim 1 associating residual neat recovering system, it is characterised in that: described waste heat boiler
Steam after interior heat exchange is sent in steam turbine, and during in steam turbine, the water of cooling enters cold doubtful device, condenser passes through kinetic pump
Condensed water is sent in waste heat boiler.
Rotary hearth furnace the most according to claim 1 associating residual neat recovering system, it is characterised in that: described oxygen processes dress
Put and be provided with the first electromagnetic valve between high pressure positive blower, between making-up air device and high pressure positive blower, be provided with the second electromagnetic valve, the first electricity
Magnet valve and the second electromagnetic valve are connected with controller, control the first electromagnetic valve and the second electromagnetic valve by controller so that high pressure
The gas oxygen content requirement that blower fan sucks controls below 2%；When oxygen content is more than 5%, connected by the first electromagnetic valve
Oxygen processing means to cooling gas burn, again heat exchange cooling；When oxygen content is between 2～5%, by the second electromagnetism
The making-up air device that valve connects, from outside Nitrogen pipe network input nitrogen.
Rotary hearth furnace the most according to claim 1 associating residual neat recovering system, it is characterised in that: described DRI cools down
Stove includes blanking section and the cooling section that charging aperture is connected with charging aperture, and the side of described cooling section is arranged over and air draft circuit
The exhaust duct communicated, it is achieved after heat exchange, steam can enter expansion chamber by exhaust duct, is provided with cold burden bed in cooling section, cold
Material bed is supported by support means, and the lower end of cooling section is provided with the air inlet that cooling wind enters；Heat material is entered by charging aperture
Cooling section, drops on cold burden bed, discharges from discharge gate, after the further heat exchange of heat material on cold burden bed under heat material
During falling, cooling wind is bottom-up and hot material carry out heat exchange after discharged by exhaust duct.
Rotary hearth furnace the most according to claim 4 associating residual neat recovering system, it is characterised in that: described cooling bed be
Class fence type grate plate steel construction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620358676.2U CN205642033U (en) | 2016-04-26 | 2016-04-26 | Waste heat recovery system is united to rotary hearth furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620358676.2U CN205642033U (en) | 2016-04-26 | 2016-04-26 | Waste heat recovery system is united to rotary hearth furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205642033U true CN205642033U (en) | 2016-10-12 |
Family
ID=57063634
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620358676.2U Withdrawn - After Issue CN205642033U (en) | 2016-04-26 | 2016-04-26 | Waste heat recovery system is united to rotary hearth furnace |
Country Status (1)
| Country | Link |
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| CN (1) | CN205642033U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105758205A (en) * | 2016-04-26 | 2016-07-13 | 江苏省冶金设计院有限公司 | Rotary hearth furnace combined waste heat recovery system |
| CN110219628A (en) * | 2018-03-02 | 2019-09-10 | 新疆科瑞石油工程技术服务有限公司 | A kind of novel flue gas oil recovery by heating equipment |
-
2016
- 2016-04-26 CN CN201620358676.2U patent/CN205642033U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105758205A (en) * | 2016-04-26 | 2016-07-13 | 江苏省冶金设计院有限公司 | Rotary hearth furnace combined waste heat recovery system |
| CN110219628A (en) * | 2018-03-02 | 2019-09-10 | 新疆科瑞石油工程技术服务有限公司 | A kind of novel flue gas oil recovery by heating equipment |
| CN110219628B (en) * | 2018-03-02 | 2024-04-09 | 山东瑞恒兴域石油技术开发有限公司 | Flue gas thermal oil extraction equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20161012 Effective date of abandoning: 20171107 |
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| AV01 | Patent right actively abandoned |