CN108149002A - A kind of continuous annealing preheating and residual neat recovering system and its flexible control method - Google Patents
A kind of continuous annealing preheating and residual neat recovering system and its flexible control method Download PDFInfo
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- CN108149002A CN108149002A CN201611094206.0A CN201611094206A CN108149002A CN 108149002 A CN108149002 A CN 108149002A CN 201611094206 A CN201611094206 A CN 201611094206A CN 108149002 A CN108149002 A CN 108149002A
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- preheating
- continuous annealing
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- jet
- recovering system
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/562—Details
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
The invention discloses a kind of continuous annealing preheatings and residual neat recovering system and its flexible control method, including preheating section and coupled waste heat recovery section, preheating section includes collection chamber, preheat babinet, heat exchanger, jet bellows, circulating fan and smoke exhaust fan, collection chamber is connected with preheating the upper end of babinet, it is several right that jet bellows are equipped with, it is set in preheating cabinet body, heat exchanger there are one being all provided in each jet bellows, circulating fan is equipped with several, also it is set in preheating cabinet body, and each circulating fan connects respectively with a pair of of jet bellows, the lower end of preheating babinet is connected by pipeline with smoke exhaust fan, waste heat recovery section includes reclaimer and chimney, chimney is connected by pipeline with reclaimer and smoke exhaust fan respectively.The present invention can not only promote the energy utilization rate of radiant tube combustion tail gas, additionally it is possible to adequately coordinate the thermic load relationship between the jet heating equipment of preheating section and the overheat wetting system of waste heat recovery section.
Description
Technical field
The present invention relates to cold-strip steel continuous heat fields, are returned more specifically to a kind of continuous annealing preheating and waste heat
Receipts system and its flexible control method.
Background technology
Large-scale vertical continuous annealing furnace bringing-up section generally generates heat using radiant tube combustion gas, passes through the side of radiation
Method heats strip, and a large amount of combustion tail gas is thus discharged out of radiant tube and exhaust gas temperature is also relatively high, in general
700 DEG C of the exhaust gas temperature of radiant tube, in order to which the orthodox practice for reducing energy consumption cold-strip steel continuous heat technology is in strip heat
Processing region preheats it using preheating device.But due to the scarce capacity of current preheating furnace, often final smoke evacuation
Temperature be still up to 400-500 DEG C it is even higher, as shown in Figure 1, in thermal treatment zone b using radiant tube d heating by the way of
Strip i is heated, radiant tube burning waste gas carries out hot friendship with protective gas in preheating furnace a by the heat exchanger e being placed in smokejack
It changes, the pressure in regulating valve g and exhaust system h control preheating furnaces；Protective gas uses convection current to conduct heat substantially in stove after heating
Method heating strip, the convection transfer rate of this mode of heating is relatively low, therefore the efficiency of heating surface is relatively low, in smokejack
The requirement of heat exchanger e abilities is not also high, and the temperature of final exhaust gas discharge is also higher.
In order to further promote the utilization rate of the energy, current most of continuous annealing unit has all carried out and waste heat
Relevant technological transformation work is recycled, as shown in Fig. 2, increasing a set of waste heat recovery apparatus behind preheating furnace generates superheated water or overheat
Steam is mainly used for cleaning and the hot-air seasoning of strip.It is (pre- due to being limited by preheating section heating efficiency as can be seen from Figure 2
The exhaust gas temperature of hot arc uses novel preheating section heating technique that can so that exhaust gas temperature can be with generally at 400-500 DEG C
It is reduced to 200-300 DEG C), the burning waste gas part come out from collection chamber 1 enters heat exchanger 8 and preheating section 3 by valve 2c
Recyclegas carry out heat exchange, recyclegas after heat exchange enters back into preheating section 3 by circulating fan 5 and heats strip 4, wherein
2e is preheating section control valve.Some burning waste gas is directly entered waste heat recovery apparatus 9, waste heat recovery by valve 2b
Equipment 9 is mainly used to generate superheated water, including cooling water inlet 11 and overheat water out 12.In general it is remaining according to design requirement
Heat recovery equipment 9 has certain limitation to flue-gas temperature and flow, may be more than remaining when the thermic load of bringing-up section is higher
Heat recovery equipment normal range of operation in order to ensure the safety of equipment, fills temperature sensor 6, when flue-gas temperature height on pipeline
When design requirement, flue gas is cooled down after opening the cold wind of valve 2d supplements part, and flowmeter 7 is also equipped on pipeline and tests flue gas
Flow, and when due to cold wind incorporation so that flue gas flow be more than design requirement when, it has to open bypath valve 2f, will
Partial flue gas is discharged into chimney, once such case occurs, it is meant that the huge waste of the energy.Analyze current preheating section with
Waste heat recovery apparatus (energy recovery of the equipment is generally below 5%) can not simultaneously fully effectively work the main reason for be：
Not only heating efficiency is poor, but also regulating power is also poor for preheating section.
Invention content
In view of the above defects of the prior art, the object of the present invention is to provide a kind of continuous annealing preheating and waste heat recoveries
System and its flexible control method can not only promote the energy utilization rate of radiant tube combustion tail gas, reduce the waste of the energy, also
The thermic load relationship between the jet heating equipment of preheating section and the overheat wetting system of waste heat recovery section, association can adequately be coordinated
Adjust the heating speed of preheating section strip steel, and the relationship between overheat water production, assess the jet heating equipment of preheating section with it is remaining
The optimum synergistic work operating mode of the overheat wetting system of heat-recovery section.
To achieve the above object, the present invention adopts the following technical scheme that：
On the one hand, a kind of continuous annealing preheating and residual neat recovering system, including preheating section and coupled waste heat recovery section,
Preheating section includes collection chamber, preheating babinet, heat exchanger, jet bellows, circulating fan and smoke exhaust fan, collection chamber and is stored up to collect
Radiant tube burning waste gas is deposited, and the upper end with preheating babinet connects, it is several right that jet bellows are equipped with, in preheating cabinet body, often
It is all provided in a jet bellows there are one heat exchanger, circulating fan is equipped with several, is also set in preheating cabinet body, and each circulated air
Machine connects respectively with a pair of of jet bellows, and the lower end for preheating babinet is connected by pipeline with smoke exhaust fan, and waste heat recovery section includes
Reclaimer and chimney, chimney are connected by pipeline with reclaimer and smoke exhaust fan respectively.
Temperature sensor and flowmeter are additionally provided on the pipeline that the smoke exhaust fan is connected with preheating babinet.
The heat exchanger is the gas-to-gas heat exchanger of shell-and-tube.
Pressure-regulating valve is additionally provided on the collection chamber, the pipeline that chimney is connected with smoke exhaust fan is equipped with regulating valve.
Cooling water inlet and overheat water out are additionally provided on the reclaimer.
The circulating fan is frequency conversion type circulating fan.
It is Demountable between the heat exchanger and jet bellows.
The jet bellows are heat-resistance stainless steel material, and are made of laser blanking.
On the other hand, the flexible control method of a kind of continuous annealing preheating and residual neat recovering system, includes the following steps：
S1. the radiant tube burning waste gas in collection chamber is entered by the pressure that smoke exhaust fan generates in preheating babinet；
S2. heat exchanger converts out the thermal energy in radiant tube burning waste gas, and passes through jet bellows and be ejected on strip, spray
The gas of injection be pressurized by circulating fan after return jet bellows in, then together with radiant tube burning waste gas by heat exchanger into
Row heat exchange, the recyclegas after heat exchange pass through on jet bellows jet stream to strip；
S3. when the thermic load in preheating cabinet body is higher, by promoting the air quantity of circulating fan, so as to promote recyclegas
With the heat exchange amount of radiant tube burning waste gas, exhaust gas temperature of the radiant tube burning waste gas in preheating section is reduced, when in preheating cabinet body
When thermic load is relatively low, by reducing the rotating speed of circulating fan or dismantling several heat exchangers；
S4. the exhaust gas out of preheating cabinet body out is expelled to successively by temperature sensor and flowmeter by smoke exhaust fan
In reclaimer.
In the S4 steps, when the thermic load in preheating cabinet body is larger, the flow of exhaust gas is more than the requirement of reclaimer
When, open regulating valve, discharge unit exhaust gas to chimney.
In above-mentioned technical solution, the present invention can adequately coordinate jet heating equipment and the waste heat recovery of preheating section
Thermic load relationship between the overheat wetting system of section, coordinates the pass between the heating speed of preheating section strip steel and overheat water production
System can adequately utilize the thermal energy of radiant tube combustion tail gas, further improve the thermal efficiency of radiant tube burner, to greatest extent
The waste of the energy is reduced, while realizes that preheating section is controlled with the flexible of waste heat recovery section further through the heating efficiency of adjustment preheating babinet
System.
Description of the drawings
Fig. 1 is the schematic diagram of radiant tube burning waste gas UTILIZATION OF VESIDUAL HEAT IN in existing strip continuous heat unit；
The schematic diagram of the existing continuous annealing unit heat recovery of Fig. 2；
Fig. 3 is the structure diagram of the present invention.
Specific embodiment
The technical solution further illustrated the present invention with reference to the accompanying drawings and examples.
Incorporated by reference to shown in Fig. 3, a kind of continuous annealing preheating provided by the present invention and residual neat recovering system, including preheating section and
Coupled waste heat recovery section, preheating section include collection chamber 101, preheating babinet 102, heat exchanger 103, jet bellows 104, follow
Ring wind turbine 105 and smoke exhaust fan 106, collection chamber 101 store radiant tube burning waste gas, and with preheating babinet 102 to collect
Upper end connects, the pressure that as can be seen from Figure 3 the radiant tube combustion tail gas in collection chamber 101 is generated by smoke exhaust fan 106
Into preheating section, since the exhaust gases passes of preheating section are sufficiently large, (103 shell side crushing of heat exchanger is born according to unit maximum in preheating section
Lotus is designed), be not in due to smoke evacuation pressure required when thermic load is high increased situation suddenly, the spoke of collection chamber 101
It penetrates pipe combustion tail gas not needing to directly be bypassed to reclaimer 107, this has very big with heat recovery scheme existing in Fig. 2
Difference.It is several right that jet bellows 104 are equipped with, and in preheating cabinet body 102, is all provided in each jet bellows 104 there are one changing
Hot device 103, circulating fan 105 are equipped with several, are also set in preheating cabinet body 102, and each circulating fan 105 respectively with a pair
Jet bellows 104 connect, and the lower end of preheating babinet 102 is connected by pipeline with smoke exhaust fan 106, and waste heat recovery section includes recycling
Equipment 107 and chimney 108, chimney 108 are connected by pipeline with reclaimer 107 and smoke exhaust fan 106 respectively, preheat babinet
The thermal energy of exhaust gas is quickly transferred to strip 99 up by the way of jet stream forced heat-exchanging in 102, the gas of jet stream is pre-
Hot friendship is carried out by heat exchanger 103 with radiant tube burning waste gas after protective gas is pressurized by circulating fan 105 in hot tank body 102
It changes, the recyclegas after heat exchange passes through on jet bellows 104 jet stream to strip 99.
Preferably, it is additionally provided with temperature sensor 109 on the pipeline that the smoke exhaust fan 106 is connected with preheating babinet 102
With flowmeter 110, in general temperature sensor 109 and flowmeter 110 be involved in the control of preheating section exhaust gas, it is pre- by adjusting
The parameter of hot arc relevant device makes the temperature of exhaust gas always be controlled in rational range.In order to ensure setting for waste heat recovery section
The energy quality (flue-gas temperature is sufficiently high) of standby inlet flue gas, does not set cold wind valve on inlet duct, makes waste heat recovery section
The temperature of equipment entrance flue gas is realized by changing the heating efficiency of preheating section.In order to adequately utilize radiant tube burning useless
The thermal energy of gas, 150-250 DEG C of the exhaust gas temperature of chimney 108.In order to reduce the drag losses of smoke exhaust process, the heat exchanger of preheating section
103 use appropriate heat exchange area with the equipment of pre- heat-recovery section.
Preferably, the heat exchanger 103 is the gas-to-gas heat exchanger of shell-and-tube, due to radiant tube burning waste gas and preheating
Recyclegas completes heat exchange in jet bellows 104 in babinet 102, therefore heat exchanger 103 is for radiant tube burning waste gas warm
It can efficiently use extremely important.
Preferably, being additionally provided with pressure-regulating valve 111 on the collection chamber 101, gas collection is adjusted by pressure-regulating valve 111
The pipeline that the pressure of radiant tube burning waste gas in room 101, chimney 108 and smoke exhaust fan 106 connect is equipped with regulating valve 112, when
The thermic load preheated in babinet 102 is larger, when the flow of exhaust gas is more than the requirement of reclaimer 107, opens regulating valve 112, row
Portion is put to chimney 108, is discharged outward by chimney 108.
Preferably, cooling water inlet 113 and overheat water out 114, reclaimer are additionally provided on the reclaimer 107
107 are generally air-water heat exchanger.
Preferably, the circulating fan 105 is frequency conversion type circulating fan, in order to fully coordinate the heating of preheating section
Ability, and cause the efficient collaborative work between preheating section and waste heat recovery section, frequency conversion is between 30~100Hz.
Preferably, being Demountable between the heat exchanger 103 and jet bellows 104, expand preheating section and add
The elastic working range of thermal energy power.
Preferably, since the temperature of radiant tube burning waste gas is higher, generally at 700 DEG C or so, the jet bellows 104
For heat-resistance stainless steel material, due to the jet heating equipment in preheating section size to the convection transfer rate that jet heats with returning
The influence of wind resistance is notable, and jet bellows 104 are made using laser blanking so as to control the precision of size.
In general the operation of circulating fan 105 needs to expend a certain amount of electric energy, the work(of circulating fan 105 in preheating section
Rate heat utilization rate positive correlation with radiant tube burning waste gas again, in order to making full use of the thermal energy of radiant tube burning waste gas
The electricity consumption of circulating fan 105 in preheating section can be controlled again within the scope of rational, the jet heating equipment of preheating section
Parameters will pass through adequately optimization, so that equipment can be run under rational operating mode.
A kind of continuous annealing preheating provided by the present invention and the flexible control method of residual neat recovering system, include the following steps：
S1. the radiant tube burning waste gas in collection chamber 101 enters preheating babinet by the pressure that smoke exhaust fan 106 generates
In 102, if the radiant tube burning waste gas pressure in collection chamber 106 is excessive, the pressure-regulating valve 111 of collection chamber lower end can be passed through
It is adjusted.
S2. heat exchanger 103 converts out the thermal energy in radiant tube burning waste gas, and passes through jet bellows 104 and be ejected into band
On steel 99, the gas that ejects is returned after being pressurized by circulating fan 105 in jet bellows 104, then with radiant tube burning waste gas
Heat exchange is carried out by heat exchanger 103 together, the recyclegas after heat exchange passes through on jet bellows 104 jet stream to strip 99.
S3. it when the thermic load in preheating babinet 102 is higher, by promoting the air quantity of circulating fan 105, is followed so as to be promoted
Ring gas and the heat exchange amount of radiant tube burning waste gas reduce exhaust gas temperature of the radiant tube burning waste gas in preheating section, meet recycling
Equipment 107 is in the temperature requirement for not mixing cold wind, when the thermic load in preheating cabinet body is relatively low, by reducing circulating fan
105 rotating speed or even several circulating fans 105 are closed in extreme situations, can both reach the guarantor of heat exchanging device 103 in this way
The purpose of shield, if water meeting heat exchanging device 103 is precipitated in flue gas generates corrosion, additionally it is possible to meet the thermic load of reclaimer 107
It is required that so that entire continuous annealing equipment has more flexibility during entire using energy source.
It, can be according to the exhaust gas utilization of waste heat recovery section and optimization in addition it can dismantle several heat exchangers 103
Operating mode flexibly arranges the group number of heat exchanger 103 to reach the flexible control of preheating section and waste heat recovery section.
S4. the exhaust gas out of preheating babinet 102 out is successively by temperature sensor 109 and flowmeter 110, by Smoke
Machine 106 is expelled in reclaimer 107.In general temperature sensor 109 participates in preheating section exhaust gas utilization with flowmeter 110
Control, by adjusting the parameter of above-mentioned preheating section equipment, the temperature of exhaust gas is always controlled in rational range, can realize
A large amount of waste gas residual heat is transferred to strip 99 up, entire waste gas energy utilize during without because equipment limitation without
It obtains and does not mix cold wind, cause the reduction of the taste of the energy that will not occur crossing low corrosion fume extractor due to exhaust gas temperature.
Preferably, in the S4 steps, when the thermic load in preheating babinet 102 is larger, the flow of exhaust gas is more than recycling
During the requirement of equipment 107, regulating valve 112, discharge unit exhaust gas to chimney 108 are opened, reclaimer 107 is generally air-water and changes
Hot device, equipped with cooling water inlet 113 and overheat water out 114.
Those of ordinary skill in the art it should be appreciated that more than embodiment be intended merely to illustrate the present invention,
And be not used as limitation of the invention, as long as in the spirit of the present invention, the change to embodiment described above
Change, modification will be all fallen in the range of claims of the present invention.
Claims (10)
1. a kind of continuous annealing preheating and residual neat recovering system, which is characterized in that including preheating section and coupled waste heat recovery
Section, preheating section include collection chamber, preheating babinet, heat exchanger, jet bellows, circulating fan and smoke exhaust fan, and collection chamber is receiving
Collection storage radiant tube burning waste gas, and the upper end with preheating babinet connects, it is several right that jet bellows are equipped with, set on preheating cabinet body
It is interior, it is all provided in each jet bellows there are one heat exchanger, circulating fan is equipped with several, is also set in preheating cabinet body, and each
Circulating fan connects respectively with a pair of of jet bellows, and the lower end for preheating babinet is connected by pipeline with smoke exhaust fan, waste heat recovery
Section includes reclaimer and chimney, and chimney is connected by pipeline with reclaimer and smoke exhaust fan respectively.
2. a kind of continuous annealing preheating as described in claim 1 and residual neat recovering system, which is characterized in that the smoke exhaust fan and
Temperature sensor and flowmeter are additionally provided on the pipeline of preheating babinet connection.
3. a kind of continuous annealing preheating as described in claim 1 and residual neat recovering system, which is characterized in that the heat exchanger is pipe
The gas-to-gas heat exchanger of shell-type.
4. a kind of continuous annealing preheating as described in claim 1 and residual neat recovering system, which is characterized in that on the collection chamber also
Equipped with pressure-regulating valve, the pipeline that chimney is connected with smoke exhaust fan is equipped with regulating valve.
5. a kind of continuous annealing preheating as described in claim 1 and residual neat recovering system, which is characterized in that on the reclaimer
It is additionally provided with cooling water inlet and overheat water out.
6. a kind of continuous annealing preheating as described in claim 1 and residual neat recovering system, which is characterized in that the circulating fan is
Frequency conversion type circulating fan.
7. a kind of continuous annealing preheating as described in claim 1 and residual neat recovering system, which is characterized in that the heat exchanger and spray
It is Demountable between gas bellows.
8. a kind of continuous annealing preheating as claimed in claim 7 and residual neat recovering system, which is characterized in that the jet bellows are
Heat-resistance stainless steel material, and be made of laser blanking.
9. a kind of continuous annealing preheating as described in claim 1 and the flexible control method of residual neat recovering system, which is characterized in that packet
Include following steps：
S1. the radiant tube burning waste gas in collection chamber is entered by the pressure that smoke exhaust fan generates in preheating babinet；
S2. heat exchanger converts out the thermal energy in radiant tube burning waste gas, and passes through jet bellows and be ejected on strip, ejects
Gas be pressurized by circulating fan after return jet bellows in, then together with radiant tube burning waste gas pass through heat exchanger carry out heat
It exchanges, the recyclegas after heat exchange passes through on jet bellows jet stream to strip；
S3. when the thermic load in preheating cabinet body is higher, by promoting the air quantity of circulating fan, so as to promote recyclegas and spoke
The heat exchange amount of pipe burning waste gas is penetrated, exhaust gas temperature of the radiant tube burning waste gas in preheating section is reduced, when the heat in preheating cabinet body is born
When lotus is relatively low, by reducing the rotating speed of circulating fan or dismantling several heat exchangers；
S4. the exhaust gas out of preheating cabinet body out is expelled to recycling successively by temperature sensor and flowmeter by smoke exhaust fan
In equipment.
10. a kind of continuous annealing preheating as claimed in claim 9 and the flexible control method of residual neat recovering system, which is characterized in that
In the S4 steps, when the thermic load in preheating cabinet body is larger, and the flow of exhaust gas is more than the requirement of reclaimer, opens and adjust
Save valve, discharge unit exhaust gas to chimney.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611094206.0A CN108149002B (en) | 2016-12-02 | 2016-12-02 | Continuous annealing preheating and waste heat recovery system and flexible control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611094206.0A CN108149002B (en) | 2016-12-02 | 2016-12-02 | Continuous annealing preheating and waste heat recovery system and flexible control method thereof |
Publications (2)
| Publication Number | Publication Date |
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| CN108149002A true CN108149002A (en) | 2018-06-12 |
| CN108149002B CN108149002B (en) | 2020-03-27 |
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ID=62469569
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| CN201611094206.0A Active CN108149002B (en) | 2016-12-02 | 2016-12-02 | Continuous annealing preheating and waste heat recovery system and flexible control method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111286598A (en) * | 2020-03-20 | 2020-06-16 | 首钢京唐钢铁联合有限责任公司 | Method, device and system for controlling temperature of preheating section of annealing furnace |
| CN111912245A (en) * | 2020-07-24 | 2020-11-10 | 湖北翊通铸业有限公司 | Annealing furnace waste heat recovery utilizes device |
| WO2024056070A1 (en) * | 2022-09-15 | 2024-03-21 | 宝山钢铁股份有限公司 | Injection radiant tube preheating system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111286598A (en) * | 2020-03-20 | 2020-06-16 | 首钢京唐钢铁联合有限责任公司 | Method, device and system for controlling temperature of preheating section of annealing furnace |
| CN111912245A (en) * | 2020-07-24 | 2020-11-10 | 湖北翊通铸业有限公司 | Annealing furnace waste heat recovery utilizes device |
| WO2024056070A1 (en) * | 2022-09-15 | 2024-03-21 | 宝山钢铁股份有限公司 | Injection radiant tube preheating system |
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| Publication number | Publication date |
|---|---|
| CN108149002B (en) | 2020-03-27 |
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