CN108165700A - A kind of thermometric spray gun for being installed on converter bottom and application method - Google Patents
A kind of thermometric spray gun for being installed on converter bottom and application method Download PDFInfo
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- CN108165700A CN108165700A CN201810174518.5A CN201810174518A CN108165700A CN 108165700 A CN108165700 A CN 108165700A CN 201810174518 A CN201810174518 A CN 201810174518A CN 108165700 A CN108165700 A CN 108165700A
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- thermometric
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- spray gun
- gas
- converter
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/46—Details or accessories
- C21C5/4673—Measuring and sampling devices
Abstract
The present invention relates to converter steeling technology fields, provide a kind of continuous temperature measurement spray gun for being installed on converter bottom and its application method；Thermometric spray gun is installed on converter bottom, and module is installed including thermometric channel, anti-blocking channel, cooling duct and sensor, contains O by injection2Thermometric gas, temperature profile signal transmission passage is directly established between molten steel and temperature transducer, without arranging flue gas and slag blanket, can stablize in converter steelmaking process, accurately, continuously measure molten steel temperature；While gas composition and supply gas pressure by adjusting each channel of thermometric spray gun stage by stage, control the coverage area and cladding thickness of mushroom head and slag blanket, under the premise of maintenance thermometric channel is persistently unobstructed, thermometric spray gun end and its periphery is made well to be covered, realizes the safety long-life of thermometric spray gun.The present invention is suitable for conventional top and bottom combined blown converter and pushes up BOTTOM OXYGEN converter, and within ranging from ± 15 DEG C of temperature measurement accuracy, the service life of thermometric spray gun is synchronous with furnace life.
Description
Technical field
The present invention relates to converter steeling technology field, more particularly to a kind of thermometric spray gun for being installed on converter bottom and use
Method.
Background technology
At present, the requirement to steel and iron industry intelligence manufacture, green production is increasingly urgent, and converter " key steel-making " is as main
Research and development direction.However, in order to realize converter " key steel-making ", the key index progress to converter steelmaking process is needed
It monitors in real time or predicts, such as molten steel temperature, molten steel component etc., wherein, the continuous molten steel temperature that monitors is to optimizing converter slag-making, taking off
Phosphorus and terminal point control are respectively provided with significance.Current convertor steelmaking process there is no method to realize the continuous monitoring to molten steel temperature,
Molten steel temperature can only be measured or by the artificial thermometric of grate by sublance smelting the later stage, instruct to smelt latter stage with this temperature
Blowing, this method increase production cost and labor intensity, due to being to survey rather than continuously measure molten steel temperature, the party
Method also can not accurately instruct terminal point control, and the hit rate for often resulting in the double hits of molten steel temperature, carbon content is not high.
In recent years, developing into for infrared temperature-test technology realized that the continuous temperature measurement of convertor steelmaking process provided technical support.
Patent（ZL 201510958681.7）Disclose temp measuring system and the thermometric side of a kind of electric-arc furnace steelmaking on-line measurement molten steel temperature
Infrared temperature probe is integrated in electric arc furnaces wall lance by method, this method, and the supersonic airstream generated using oxygen rifle is blown open
Foam slag blanket sets up stable molten steel temperature characteristic signal transmission channel between molten steel and sensor, realizes electric arc furnaces refining
The continuously or discontinuously on-line measurement of steel process molten steel in the stove temperature.However, for converter, due to the type of furnace and offering oxygen way
Greatest differences do not have the condition of installation wall lance, and top blow oxygen lance length used in converter is more than 10 meters, and the spray of end
Hole is tilted with certain angle, can not also provide the channel and window of temperature signal transmission；Patent（ZL 201510958681.7）
Disclosed in wall lance for water-cooling structure, and water-cooling structure spray gun can be only installed at position more than molten steel face, can not install
Furnace wall or furnace bottom below molten steel face；Meanwhile the patent（ZL 201510958681.7）In disclose thermometric gas as N2、
CO2Or Ar, but N2、CO2Or Ar is blown to causing cooling effect to molten steel surface during molten steel surface so that temperature transducers
The temperature that device measures is less than molten steel actual temperature.Therefore, the patent（ZL 201510958681.7）Disclosed temp measuring system and survey
Warm method is not particularly suited for the continuous temperature measurement of convertor steelmaking process.
The mode of current converter generally use top bottom blowing, i.e. the top high-strength oxygen into stove by oxygen rifle,
Bottom blowing element agitation molten pool is installed in bottom, by rational furnace bottom maintenance service and slag splashing, can keep bottom blowing element
Full stove labour is unobstructed.With reference to converter profile, injection method and smelting requirements, in converter bottom, installation thermometric spray gun is feasible, nothing
Flue gas and slag blanket need to be arranged, temperature signal transmission channel can be directly established between molten steel and temperature transducer, but there are following
Problem：（1）Installation site can not use water-cooling structure, how ensure that thermometric spray gun is not burnt by high-temperature molten steel below molten steel face
Damage；（2）If simply carrying out cooling protection to thermometric spray gun using cooling gas, mushroom head can be formed in lance outlet, by
Gradually block thermometric channel；（3）Due to N2、CO2Or Ar has molten steel cooling effect, how to select suitable thermometric gas, measures standard
True molten steel temperature.（4）Since thermometric spray gun is mounted on converter bottom, there is high-temperature molten steel covering in top, once gas supply interrupts, steel
Liquid will pour in down a chimney to spray gun, block even scaling loss thermometric spray gun.
Invention content
The purpose of the present invention is exactly to have overcome the deficiencies of the prior art and provide a kind of thermometric spray gun for being installed on converter bottom
And application method, on the basis of temperature signal transmission channel is provided, solve furnace bottom to be caused to corrode, because of bottom blowing shape because of bottom blown gas
Thermometric channel blockage and N are caused into mushroom head2、CO2Or Ar leads to the critical issue that thermometric is not allowed as thermometric gas.
The present invention contains O by injection2Thermometric gas, temperature profile is directly established between molten steel and temperature transducer
Signal transmission passage without arranging flue gas and slag blanket, is formed and is supplied by the gas for adjusting each channel of thermometric spray gun stage by stage
Pressure controls the coverage area and cladding thickness of mushroom head and slag blanket, under the premise of maintenance thermometric channel is persistently unobstructed, realizes
The safety long-life of thermometric spray gun, by setting contingency gas sources, cooperation grate operation avoids molten steel being caused to pour in down a chimney due to gas supply is unstable
To spray gun.
The specific technical solution of the present invention is as follows：
A kind of thermometric spray gun for being installed on converter bottom installs mould including thermometric channel, anti-blocking channel, cooling duct and sensor
Block；The side wall of the thermometric spray gun is equipped with thermometric gas access, anti-blocking gas access and cooling gas inlet；The sensor peace
The die-filling piece of lower end for being arranged on the thermometric channel, the sensor installation module and the thermometric channel are saturating by high temperature resistant
Optical element sealing isolation.
Further, the sensor is installed and infrared temperature probe is provided in module, in the infrared temperature probe
Heart line and the center line of the thermometric channel are coaxial.
Further, the sensor installation module is process by refractory metal material, inside filling bradyseism material,
High-temperaure coating is smeared in outer surface, avoids probe-shift or damage caused by furnace body fascinates with high temperature under stove.
Further, the thermometric channel of the thermometric spray gun, anti-blocking channel and cooling duct are coaxially arranged, the survey
Warm channel, anti-blocking channel, the port of export of cooling duct are concordant with furnace bottom.
Further, the air supply system of the thermometric spray gun includes air supply system and air regulating device, the air source system
System includes conventional air source and contingency gas sources, and the pressure of the contingency gas sources is maintained at more than 1.5MPa, and the contingency gas sources can be solely
It is vertical to meet thermometric spray gun gas supply more than 3min.
Further, in order to which under the premise of stabilization signal transmission channel is provided, the gas flow of reduction thermometric spray gun subtracts
Gently to the erosion of furnace bottom, the latus rectum of the thermometric channel is 10 ~ 30mm.
Further, since converter bottom dust is big, temperature is high, and converter needs to realize 360 ° of rotations, temperature transducer
It can not be communicated by cable and optical fiber with host computer, therefore the temperature transducer of sensor installation module is using wireless transmission
Mode and host computer communicate.
Further, top and bottom combined blown converter and top BOTTOM OXYGEN converter of the thermometric spray gun suitable for 50 ~ 350 tons.
A kind of application method of above-mentioned thermometric spray gun, the thermometric spray gun thermometric channel, anti-blocking channel, cooling duct
Gas forms and supply gas pressure is using control by stages, is as follows：
In the stage of bessemerizing：Thermometric channel is blown thermometric gas, and the thermometric gas is O2-CO2Gaseous mixture or O2-N2- Ar is mixed
Gas is closed, supply gas pressure is 0.3 ~ 0.8MPa, the O2-CO2O in gaseous mixture2Ratio is 30% ~ 50%, the O2-N2- Ar gaseous mixtures
Middle O2Ratio is 20% ~ 40%, utilizes O2The exothermic effects reacted with molten steel offset N2、CO2, cooling effects of the Ar to molten steel, make
The practical molten steel temperature obtained in molten steel temperature and molten bath right over thermometric channel is consistent, and molten steel temperature characteristic signal is continuous
Ground is by thermometric channel transfer, and the translucent element across thermometric channel and sensor installation module, into temperature probe,
Molten steel temperature is obtained, realizes continuous, accurate molten steel thermometric；Anti-blocking channel is blown O2, supply gas pressure is 0.4 ~ 1.0MPa, is utilized
O2The exothermic effects reacted with molten steel avoid thermometric channel end from generating mushroom head, and thermometric channel is caused to reduce and is even blocked；It is cold
But channel injection CH4、N2, Ar or its mixed air, supply gas pressure is 0.5 ~ 1.2MPa, passes through the cracking heat absorption of cooling gas or object
Reason heat absorption forms mushroom head covering in cooling duct end and its outside, high-temperature molten steel is inhibited to rush furnace bottom and thermometric spray gun
Brush corrodes and scaling loss；
In the splashing slag in converter stage：Thermometric channel blows air, supply gas pressure (contain on a small quantity for 0.5 ~ 1.0MPa in air
Oxygen), using high-voltage high-speed air draught, clinker is avoided to enter thermometric channel or is covered in thermometric channel end；Anti-blocking channel
Blows air, supply gas pressure are 0.5 ~ 1.0MPa (containing a small amount of oxygen in air), using high-voltage high-speed air draught, are avoided
Clinker enters anti-blocking channel or is covered in anti-blocking channel end；Cooling duct is blown N2, supply gas pressure is 0.6 ~ 1.2MPa, cold
But slag blanket covering is formed on the basis of channel end and its covering of outside mushroom head, protects thermometric spray gun, meanwhile, pass through high pressure height
Fast air-flow avoids the coating of cooling duct end is too thick cooling duct is caused to block；
In other stages of converter smelting：Both without liquid slag in stove, also without molten steel, therefore thermometric channel, anti-blocking channel
N is blown with cooling duct2, the supply gas pressure of thermometric channel and anti-blocking channel is 0.3 ~ 0.5MPa, and cooling duct is due to end
It is covered by mushroom head and slag blanket, supply gas pressure is 0.4 ~ 0.8MPa.
Further, the air supply system of the thermometric spray gun includes air supply system and air regulating device, the air source system
System includes conventional air source and contingency gas sources, and the pressure of the contingency gas sources is maintained at more than 1.5MPa, and the contingency gas sources can be solely
It is vertical to meet thermometric spray gun gas supply more than 3min；When the pressure of the conventional air source is less than 1.2MPa, control system provides report
Alert signal is immediately switched to contingency gas sources gas supply, top blow oxygen lance is proposed converter, and tilting converter is exposed to thermometric spray gun, prevents
Only molten steel is caused to pour in down a chimney to thermometric channel due to bleed pressure deficiency.
Beneficial effects of the present invention are：
（1）A kind of continuous temperature measurement spray gun for being installed on converter bottom using the present invention and its application method, solve by converter
The problem of continuous molten steel thermometric can not be realized caused by the type of furnace, offering oxygen way limitation in steel ullage；
（2）A kind of continuous temperature measurement spray gun for being installed on converter bottom using the present invention and its application method, converter bottom aneroid
State clinker by bottom blowing thermometric gas, can directly establish temperature profile signal transmission passage between molten steel and temperature transducer,
Flue gas and clinker need not be arranged, without the interference of flue gas and clinker, more stable and more accurately temperature measurement data can be obtained；
（3）A kind of continuous temperature measurement spray gun for being installed on converter bottom using the present invention and its application method, pass through thermometric spray gun
The gas of injection can provide temperature signal transmission channel, also can agitation molten pool, improve the dynamic conditions of converter；
（4）The present invention has obtained the composition of thermometric gas, has offset CO by a large amount of creative Experimental Researchs2、N2, Ar is to steel
The cooling effect of liquid obtains more accurate molten steel temperature measurement result；Within ranging from ± 15 DEG C of temperature measurement accuracy；
（5）A kind of continuous temperature measurement spray gun for being installed on converter bottom using the present invention and its application method, by converter smelting
Each stage of refining, dynamic regulation thermometric channel, anti-blocking channel and the gas of cooling duct composition, control mushroom head and slag blanket cover
Lid range and cladding thickness, under the premise of thermometric channel is uncovered so that cooling duct end and its periphery are well covered
Lid, that realizes thermometric channel continues unobstructed and thermometric spray gun safety long-life.
（6）A kind of continuous temperature measurement spray gun for being installed on converter bottom using the present invention and its application method, pass through setting
Contingency gas sources, cooperation grate operation avoid molten steel being caused to pour in down a chimney to spray gun due to gas supply is unstable, protect thermometric spray gun and thermometric
Probe.
Description of the drawings
Fig. 1 show a kind of thermometric spray gun structure schematic diagram for being installed on converter bottom of the embodiment of the present invention.
In figure：1st, converter；2nd, molten steel；3rd, clinker；4th, top blow oxygen lance；5th, thermometric spray gun；5-1, thermometric channel；It is 5-2, anti-blocking
Channel；5-3, cooling duct；5-4, sensor installation module；5-5, thermometric gas access；5-6, anti-blocking gas access；It is 5-7, cold
But gas access；5-8, translucent element；5-9, infrared temperature probe.
Specific embodiment
The specific embodiment of the invention is described in detail below in conjunction with specific attached drawing.It should be noted that in following embodiments
The combination of the technical characteristic or technical characteristic of description is not construed as isolated, they can be combined with each other to reach
To superior technique effect.In the attached drawing of following embodiments, identical label that each attached drawing occurs represent identical feature or
Person's component can be applied in different embodiments.
As shown in Figure 1, a kind of thermometric spray gun for being installed on converter bottom of the embodiment of the present invention, including thermometric channel 5-1, prevents
Stifled channel 5-2, cooling duct 5-3 and sensor installation module 5-4；The side wall of the thermometric spray gun is equipped with thermometric gas access 5-
5th, anti-blocking gas access 5-6 and cooling gas inlet 5-7；The sensor installation module 5-4 is arranged on the thermometric channel 5-1
Lower end, the sensor installation module 5-4 and thermometric channel 5-1 passes through high temperature resistant translucent element 5-8 sealings and completely cuts off.
Infrared temperature probe 5-9, the center line of the infrared temperature probe 5-9 and institute are provided in the sensor installation module 5-4
The center line for stating thermometric channel 5-1 is coaxial.Preferably, sensor installation module 5-4 processed by refractory metal material and
Into inside filling bradyseism material, outer surface smears high-temperaure coating, avoids the probe-shift caused by furnace body fascinates with high temperature under stove
Or damage.Thermometric channel 5-1, the anti-blocking channel 5-2 and cooling duct 5-3 of the thermometric spray gun are coaxially arranged outward from center,
The thermometric channel 5-1, anti-blocking channel 5-2, the port of export of cooling duct 5-3 are concordant with furnace bottom.
Embodiment 1
The embodiment of the present invention is applied on 120 tons of top and bottom combined blown converters, and the furnace bottom of the converter installs 1 thermometric spray gun of the invention
With the capillary type bottom blowing element of 4 routines, the thermometric channel 5-1 latus rectums of thermometric spray gun are 15mm, the slit width of anti-blocking channel 5-2
For 2mm, the slit width of cooling duct 5-3 is 1mm.
In the stage of bessemerizing, thermometric channel 5-1 injection thermometric gases, thermometric gas is O2-N2- Ar gaseous mixtures, in order to keep away
It is exceeded to exempt from terminal nitrogen content in liquid steel, it is O to bessemerize early period and mid-term2-N2Gaseous mixture, blowing later stage are O2- Ar gaseous mixtures supply
Atmospheric pressure is 0.3 ~ 0.5MPa, O in thermometric gas2Ratio is 30%；Anti-blocking channel 5-2 is blown O2, supply gas pressure for 0.4 ~
0.6MPa utilizes O2The very exothermic effect reacted with molten steel, avoids thermometric channel 5-1 ends from generating mushroom head；Cooling duct
5-3 is blown CH4, supply gas pressure is 0.5 ~ 0.7MPa, passes through CH4Cracking heat absorption, in cooling duct 5-3 ends and its outside shape
It is covered into mushroom head, high-temperature molten steel is inhibited to wash away erosion and scaling loss to furnace bottom and thermometric spray gun.
In the splashing slag in converter stage, thermometric channel 5-1 blows airs, supply gas pressure is 0.5 ~ 0.6MPa, is contained in air
There is a small amount of oxygen, using high-voltage high-speed air draught, clinker is avoided to enter thermometric channel 5-1 or is covered in thermometric channel 5-1
End；Anti-blocking channel 5-2 blows airs, supply gas pressure are 0.5 ~ 0.6MPa, contain a small amount of oxygen in air, utilize high pressure height
Fast air draught avoids clinker from entering anti-blocking channel 5-2 or is covered in anti-blocking channel 5-2 ends；Cooling duct 5-3 is blown N2,
Supply gas pressure is 0.6 ~ 0.8MPa, and slag blanket covering is formed on the basis of cooling duct 5-3 ends and its covering of outside mushroom head,
Thermometric spray gun is protected, meanwhile, by high-voltage high-speed airflow, avoid the coating of cooling duct 5-3 ends is too thick from causing cooling logical
Road 5-3 is blocked.
In other stages of converter smelting, both without liquid slag in stove, also without molten steel, therefore it is thermometric channel 5-1, anti-
Stifled channel 5-2 and cooling duct 5-3 be blown the supply gas pressure of N2, thermometric channel 5-1 and anti-blocking channel 5-2 for 0.3 ~
Since end is by mushroom head and slag blanket covering, supply gas pressure is 0.5 ~ 0.6MPa by 0.4MPa, cooling duct 5-3.
After converter thermometric spray gun using the present invention and method, continuous measurement of the smelting process to molten steel temperature is realized,
The temperature measurement accuracy of thermometric spray gun is ± 13 DEG C；Thermometric spray gun realizes that full stove labour is unimpeded, and furnace life is without significant change.
Embodiment 2
The present invention, which is applied, to be pushed up at 300 tons in BOTTOM OXYGEN converter, and the furnace bottom of the converter installs 1 thermometric spray gun of the invention and 7
Double-layer sleeve-type spray gun, the thermometric channel latus rectum of thermometric spray gun are 25mm, and the slit width of anti-blocking channel is 2mm, the seam of cooling duct
Width is 1mm, the central tube injecting oxygen and pulvis of Double-layer sleeve-type spray gun, circumferential weld injection cooling gas.
In the stage of bessemerizing, thermometric channel 5-1 injection thermometric gases, thermometric gas is O2-CO2Gaseous mixture, supply gas pressure
For 0.5 ~ 0.6MPa, O in thermometric gas2Ratio is 40%；Anti-blocking channel 5-2 is blown O2, supply gas pressure is 0.6 ~ 0.8MPa, is utilized
O2The very exothermic effect reacted with molten steel, avoids thermometric channel 5-1 ends from generating mushroom head；Cooling duct 5-3 is blown CH4, supply
Atmospheric pressure is 0.7 ~ 1.0MPa, passes through CH4Cracking heat absorption, mushroom head covering is formed in cooling duct 5-3 ends and its outside,
High-temperature molten steel is inhibited to wash away erosion and scaling loss to furnace bottom and thermometric spray gun.
In the splashing slag in converter stage, thermometric channel 5-1 blows airs, supply gas pressure is 0.5 ~ 0.6MPa, is contained in air
There is a small amount of oxygen, using high-voltage high-speed air draught, clinker is avoided to enter thermometric channel 5-1 or is covered in thermometric channel 5-1
End；Anti-blocking channel 5-2 blows airs, supply gas pressure are 0.5 ~ 0.6MPa, contain a small amount of oxygen in air, utilize high pressure height
Fast air draught avoids clinker from entering anti-blocking channel 5-2 or is covered in anti-blocking channel 5-2 ends；Cooling duct 5-3 is blown N2,
Supply gas pressure is 0.7 ~ 1.0MPa, and slag blanket covering is formed on the basis of cooling duct 5-3 ends and its covering of outside mushroom head,
Thermometric spray gun is protected, meanwhile, by high-voltage high-speed airflow, avoid the coating of cooling duct 5-3 ends is too thick from causing cooling logical
Road 5-3 is blocked.
In other stages of converter smelting, both without liquid slag in stove, also without molten steel, therefore it is thermometric channel 5-1, anti-
Stifled channel 5-2 and cooling duct 5-3 is blown N2, the supply gas pressure of thermometric channel 5-1 and anti-blocking channel 5-2 for 0.3 ~
Since end is by mushroom head and slag blanket covering, supply gas pressure is 0.5 ~ 0.6MPa by 0.4MPa, cooling duct 5-3.
After converter thermometric spray gun using the present invention and method, continuous measurement of the smelting process to molten steel temperature is realized,
The temperature measurement accuracy of thermometric spray gun is ± 15 DEG C；Thermometric spray gun realizes that full stove labour is unimpeded, and furnace life is without significant change.
Although having been presented for several embodiments of the present invention herein, it will be appreciated by those of skill in the art that
Without departing from the spirit of the invention, the embodiments herein can be changed.Above-described embodiment is only exemplary, no
It should be using the embodiments herein as the restriction of interest field of the present invention.
Claims (10)
1. a kind of thermometric spray gun for being installed on converter bottom, which is characterized in that including thermometric channel, anti-blocking channel, cooling duct
Module is installed with sensor；The side wall of the thermometric spray gun enters equipped with thermometric gas access, anti-blocking gas access and cooling gas
Mouthful；The sensor installation module is arranged on the lower end of the thermometric channel, the sensor installation module and the thermometric
Channel is sealed by high temperature resistant translucent element to be completely cut off.
2. thermometric spray gun as described in claim 1, which is characterized in that be provided with infrared measurement of temperature in the sensor installation module
Probe, the center line of the infrared temperature probe and the center line of the thermometric channel are coaxial.
3. thermometric spray gun as described in claim 1, which is characterized in that the sensor installs module by refractory metal material
It is process, inside filling bradyseism material, outer surface smears high-temperaure coating, avoids visiting caused by furnace body fascinates with high temperature under stove
Head displacement or damage.
4. thermometric spray gun as described in claim 1, which is characterized in that the thermometric channel of the thermometric spray gun, anti-blocking channel and
Cooling duct is coaxially arranged, and the thermometric channel, anti-blocking channel, the port of export of cooling duct are concordant with furnace bottom.
5. thermometric spray gun as described in claim 1, which is characterized in that the air supply system of the thermometric spray gun includes air supply system
And air regulating device, the air supply system includes conventional air source and contingency gas sources, the pressure of the contingency gas sources are maintained at
More than 1.5MPa, the contingency gas sources can independently meet thermometric spray gun gas supply more than 3min.
6. thermometric spray gun as described in claim 1, which is characterized in that the latus rectum of the thermometric channel is 10 ~ 30mm.
7. thermometric spray gun as described in claim 1, which is characterized in that the temperature transducer of the sensor installation module uses
The mode of wireless transmission is communicated with host computer.
8. such as claim 1-7 any one of them thermometric spray guns, which is characterized in that the thermometric spray gun is suitable for 50 ~ 350 tons
Top and bottom combined blown converter and top BOTTOM OXYGEN converter.
It is 9. a kind of such as the application method of claim 1-8 any one of them thermometric spray guns, which is characterized in that the thermometric spray gun
Thermometric channel, anti-blocking channel, the gas composition of cooling duct and supply gas pressure are as follows using control by stages：
In the stage of bessemerizing：Thermometric channel is blown thermometric gas, and the thermometric gas is O2-CO2Gaseous mixture or O2-N2- Ar is mixed
Gas is closed, supply gas pressure is 0.3 ~ 0.8MPa, the O2-CO2O in gaseous mixture2Ratio is 30% ~ 50%, the O2-N2- Ar gaseous mixtures
Middle O2Ratio is 20% ~ 40%, utilizes O2The exothermic effects reacted with molten steel offset N2、CO2, cooling effects of the Ar to molten steel, make
The practical molten steel temperature obtained in molten steel temperature and molten bath right over thermometric channel is consistent, and molten steel temperature characteristic signal is continuous
Ground is by thermometric channel transfer, and the translucent element across thermometric channel and sensor installation module, into temperature probe,
Molten steel temperature is obtained, realizes continuous, accurate molten steel thermometric；Anti-blocking channel is blown O2, supply gas pressure is 0.4 ~ 1.0MPa, is utilized
O2The exothermic effects reacted with molten steel avoid thermometric channel end from generating mushroom head, and thermometric channel is caused to reduce and is even blocked；It is cold
But channel injection CH4、N2, Ar or its mixed air, supply gas pressure is 0.5 ~ 1.2MPa, passes through the cracking heat absorption of cooling gas or object
Reason heat absorption forms mushroom head covering in cooling duct end and its outside, high-temperature molten steel is inhibited to rush furnace bottom and thermometric spray gun
Brush corrodes and scaling loss；
In the splashing slag in converter stage：Thermometric channel blows air, supply gas pressure are 0.5 ~ 1.0MPa, utilize high-voltage high-speed air
Air-flow avoids clinker from entering thermometric channel or is covered in thermometric channel end；Anti-blocking channel blows air, supply gas pressure for 0.5 ~
1.0MPa using high-voltage high-speed air draught, avoids clinker from entering anti-blocking channel or is covered in anti-blocking channel end；Cooling duct
It is blown N2, supply gas pressure is 0.6 ~ 1.2MPa, and slag blanket is formed on the basis of cooling duct end and its covering of outside mushroom head
Thermometric spray gun is protected in covering, meanwhile, by high-voltage high-speed airflow, avoid the coating of cooling duct end is too thick from causing to cool down
Channel blockage；
In other stages of converter smelting：Both without liquid slag in stove, also without molten steel, therefore thermometric channel, anti-blocking channel
N is blown with cooling duct2, the supply gas pressure of thermometric channel and anti-blocking channel is 0.3 ~ 0.5MPa, and cooling duct is due to end
It is covered by mushroom head and slag blanket, supply gas pressure is 0.4 ~ 0.8MPa.
10. application method as claimed in claim 9, which is characterized in that the air supply system of the thermometric spray gun includes air source system
System and air regulating device, the air supply system includes conventional air source and contingency gas sources, the pressure of the contingency gas sources are maintained at
More than 1.5MPa, the contingency gas sources can independently meet thermometric spray gun gas supply more than 3min；When the pressure of the conventional air source
During less than 1.2MPa, control system provides alarm signal, is immediately switched to contingency gas sources gas supply, top blow oxygen lance is proposed converter,
And tilting converter is exposed to thermometric spray gun, prevents from molten steel being caused to pour in down a chimney to thermometric channel due to bleed pressure deficiency.
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| CN201810174518.5A CN108165700B (en) | 2018-03-02 | 2018-03-02 | Temperature measuring spray gun installed at bottom of converter and application method |
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| CN201810174518.5A CN108165700B (en) | 2018-03-02 | 2018-03-02 | Temperature measuring spray gun installed at bottom of converter and application method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109897936A (en) * | 2019-04-29 | 2019-06-18 | 连铸 | A kind of detection system continuously detecting liquid steel temperature and composition for pneumatic steelmaking |
| CN110628983A (en) * | 2019-10-10 | 2019-12-31 | 北京科技大学 | Converter smelting fire point area temperature continuous monitoring oxygen lance system and monitoring method |
| CN111088414A (en) * | 2019-12-17 | 2020-05-01 | 湖北理工学院 | Oxygen lance with online continuous temperature measurement function and use method thereof |
| WO2021073015A1 (en) * | 2019-10-16 | 2021-04-22 | 北京科技大学 | Converter co2-o2 mixed injection smelting method and dynamic temperature control method in fire-point region |
| CN115232911A (en) * | 2022-06-17 | 2022-10-25 | 中钢集团鞍山热能研究院有限公司 | Hot air spray gun for steelmaking and blowing process thereof |
| US11808635B2 (en) | 2019-04-29 | 2023-11-07 | Chu LIEN | System for continuously detecting temperature and composition of molten steel during converter steelmaking |
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| US11788160B2 (en) | 2019-10-16 | 2023-10-17 | University Of Science And Technology Beijing | Converter CO2—O2 mixed injection smelting method and method of dynamically controlling fire point area temperature |
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