CN109161621B - A kind of two-part blast-furnace coal injection device - Google Patents
A kind of two-part blast-furnace coal injection device Download PDFInfo
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- CN109161621B CN109161621B CN201811378175.0A CN201811378175A CN109161621B CN 109161621 B CN109161621 B CN 109161621B CN 201811378175 A CN201811378175 A CN 201811378175A CN 109161621 B CN109161621 B CN 109161621B
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- blast furnace
- pulverized coal
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/001—Injecting additional fuel or reducing agents
- C21B5/003—Injection of pulverulent coal
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
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- Manufacture Of Iron (AREA)
Abstract
The invention belongs to technical field of blast furnace ironmaking more particularly to a kind of two-part blast-furnace coal injection devices comprising blast furnace and the multiple two-part pulverized coal guns being arranged in inside the blast furnace；The multiple two-part pulverized coal gun inside that the blast furnace is inserted into from the arrangement of the shaft side wall array distribution of the blast furnace horizontal from outside to inside；The multiple two-part pulverized coal gun is set as inner hollow and both ends connectivity structure, coal dust to be blown from the external world along its internal hollow channel to the inside for entering the blast furnace by carrier gas；The top of the multiple two-part pulverized coal gun is equipped with the roof beam structure for protecting the multiple two-part pulverized coal gun.Two-part pulverized coal injection in blast furnace method provided by the invention can improve gas utilization rate (η by improving gas fluid distrbution in furnaceCO), the problems such as to solve gas fluid distrbution and permeability of stock column, to realize quickly and effectively uniformly blowing, reach the application effect for mentioning high-coal ratio, reducing fuel ratio and cost.
Description
Technical field
The invention belongs to technical field of blast furnace ironmaking more particularly to a kind of two-part blast-furnace coal injection devices.
Background technique
Pulverized coal injection technology is one of the effective measures of blast furnace ironmaking cost efficiency.Pulverized coal injection not only can significantly drop
Low coke ratio, also increases a kind of adjustment means for blast furnace operating, and blast furnace operating personnel can use control coal powder injection to control blast furnace
Warm status.Therefore, pulverized coal injection in blast furnace technique can be greatly lowered pig iron cost, the use for reducing coke ratio, improve environment
The effects of.In addition, current blast furnace gas flow distribution is unfavorable for the utilization of blast furnace gas, (R is the height to appropriate increase radial direction R/3
The furnace inside radius at place) gas volume, be conducive to improve gas utilization rate (ηCO)。
The invention for increasing the device such as Patent No. ZL00123294.0 of breeze blowing for blast furnace in the prior art can only incite somebody to action
Cohesive zone and region coal injection below, effect is limited, can not improve the ventilative of gas fluid distrbution and stock column in furnace
The problems such as property.
Summary of the invention
(1) technical problems to be solved
For existing technical problem, the present invention provides a kind of two-part blast-furnace coal injection device, can improve
Gas fluid distrbution in furnace improves gas utilization rate (ηCO), the problems such as to solve gas fluid distrbution and permeability of stock column, to realize
Quickly and effectively uniformly blowing achievees the effect that mention high-coal ratio, reduces fuel ratio and cost.
(2) technical solution
In order to achieve the above object, the main technical schemes that the present invention uses include:
A kind of two-part blast-furnace coal injection device, including blast furnace and the multiple two-part coals being arranged in inside the blast furnace
Powder spray gun；
The multiple two-part pulverized coal gun restoration of lower stack or furnace bosh upper portion side wall from the blast furnace horizontal from outside to inside
The inside of the blast furnace is inserted into array distribution arrangement；
The multiple two-part pulverized coal gun is set as inner hollow and both ends connectivity structure, to pass through carrier gas for coal dust
The inside for entering the blast furnace is blown along its internal hollow channel from the external world；
The top of the multiple two-part pulverized coal gun is equipped with the roof beam structure for protecting the multiple two-part pulverized coal gun.
Preferably, the multiple two-part pulverized coal gun from the blast-furnace shaft lower part or furnace bosh upper portion side wall circumferentially
Direction is horizontally inserted into the blast furnace after being uniformly distributed；
Each two-part pulverized coal gun includes furnace inner segment and furnace outer segment；
The spray gun side wall of the furnace inner segment is equipped with multiple assisted spray gun holes of array arrangement；
The multiple assisted spray gun hole along furnace inner segment center in blast furnace end to blast furnace outside direction extend 0~
Array distribution on the side wall of 2.5m length areas；
The furnace outer segment is to connect pulverized coal conveying device.
Preferably, the multiple assisted spray gun hole is symmetric on the side wall of the same cross section of the furnace inner segment,
And the spacing in assisted spray gun hole for being located at different cross section differs, in from distribution density is gradually sparse to outside blast furnace in blast furnace.
Preferably, the multiple assisted spray gun hole on the side wall of the furnace inner segment from blast furnace to outside blast furnace distribution density
It is gradually sparse.
Preferably, the length of the furnace inner segment is A；
The blast furnace internal diameter of plane where the furnace inner segment is R；
There are following mathematical relationships with the R by the A:
Preferably, vertical range of the furnace inner segment away from cohesive zone in the blast furnace is between 0.5~1.5m.
Preferably, the internal diameter of each two-part pulverized coal gun is between 10~30mm, outer diameter between 100~
Between 200mm, assisted spray gun hole aperture is between 2~5mm.
Preferably, the material of each two-part pulverized coal gun and the roof beam structure is to be able to bear 1200 DEG C or more rings
The high temperature resistant material of border temperature.
Preferably, the quantity of the two-part pulverized coal gun is 2~20.
Preferably, the roof beam structure includes multiple beam bones；
A umbrella stand shape structural body is formed by welding in the multiple beam bone；
Each beam bone is fixedly connected with the inner wall of the blast furnace；
Each beam bone can protect the furnace inner segment of a two-part pulverized coal gun from stock column in blast furnace
It influences, achievees the purpose that the furnace inner segment keeps parallel with horizontal line in the blast furnace.
(3) beneficial effect
The beneficial effects of the present invention are: a kind of two-part blast-furnace coal injection device provided by the invention, can improve furnace
Interior gas fluid distrbution improves gas utilization rate (ηCO), to solve the problems, such as gas fluid distrbution and permeability of stock column, to realize quick
Effectively uniformly blowing reaches the beneficial effect for mentioning high-coal ratio, reducing fuel ratio and cost.
Specifically, it by adjusting two-part pulverized coal gun position, controls coal dust and reaches cohesive zone top, restoration of lower stack, have
Conducive to the excessive accumulated powder in part mitigated in dropping zone caused by traditional coal injection technology, it is poor to reduce blast furnace total pressure.Guaranteeing stock column
Under the premise of pressure difference is constant, the blow rate required increases, and yield also increases accordingly.It is more that two-stage type blowing breeze method can be such that blast furnace receives
Injecting coal quantity, coal than increase, coke ratio reduce, facilitate reduce ironmaking cost comprehensive benefit.
After 2~20 coal rifles are along the circumferential direction horizontally inserted into from blast-furnace shaft lower part or furnace bosh upper portion side wall, due to side
Edge effect plays air guide (wind) Guan Zuoyong, improves the gas permeability of blast furnace stock column, reduces blast furnace pressure difference.
It, can when 2~20 coal rifles are distributed uniformly and circumferentially arrangement from blast-furnace shaft lower part or furnace bosh upper portion side wall
Improve gas fluid distrbution at blast furnace inner radial R/3, rich CO coal gas enters the region, promotes the restore-zone, be conducive to improve
Gas utilization rate (ηCO), reduce fuel ratio.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of two-part blast-furnace coal injection device of the present invention；
Fig. 2 is a kind of schematic top plan view of two-part blast-furnace coal injection device of the present invention；
Fig. 3 (a) is a kind of top view of two-part blast-furnace coal injection device middle beam frame of the present invention, is (b) present invention one
The schematic diagram of the cross section of the beam bone of kind two-part blast-furnace coal injection device middle beam frame；
Fig. 4 is that the structure of the furnace inner segment of two-part pulverized coal gun in a kind of two-part blast-furnace coal injection device of the present invention is shown
It is intended to；
Fig. 5 is the top view of two-part pulverized coal gun in a kind of two-part blast-furnace coal injection device of the present invention；
Fig. 6 is that the present invention is not inserted into two-stage type blowing breeze device and the blast furnace of insertion two-stage type blowing breeze device is ventilative
Property (wind speed) contrast schematic diagram.
[description of symbols]
1: blast furnace；
102: cohesive zone；103: shaft；
2: two-part pulverized coal gun；201: assisted spray gun hole；
3: roof beam structure；
A: experiment line of the invention is not used；B: experiment line of the invention is used；
Specific embodiment
In order to preferably explain the present invention, in order to understand, with reference to the accompanying drawing, by specific embodiment, to this hair
It is bright to be described in detail.
As shown in Figs. 1-2: present embodiment discloses a kind of two-part blast-furnace coal injection devices, including blast furnace 1, setting to exist
Multiple two-part pulverized coal guns 2 and roof beam structure 3 inside the blast furnace 1.
Blast furnace 1 described here refers to blast furnace, and the improvements in the present embodiment essentially consist in as in the prior art
Blast furnace provide a logical set and can increase coal powder blowing amount, improve gas fluid distrbution in furnace, improve ironmaking production efficiency
Method.
Device described here includes roof beam structure 3 and two-part pulverized coal gun 2.
In detail, the multiple two-part pulverized coal gun 2 is horizontal from outside to inside from the shaft side wall array of the blast furnace 1 point
The inside of the blast furnace is inserted into cloth arrangement.For clarity, a two-part pulverized coal gun 2, actual distribution are illustrated only in Fig. 1
Mode is visible with reference to Fig. 2.
The multiple two-part pulverized coal gun 2 is set as inner hollow and both ends connectivity structure, to pass through carrier gas for coal
Powder is sprayed into the inside of the blast furnace 1 from the external world along its internal hollow channel.
2 overall structure of two-part pulverized coal gun described in the present embodiment is similar to the snorkel or logical of a both sides connection
Water pipe, to transmit coal dust, be transmitted in furnace according to certain solid gas ratio from the external world particular by high pressure carrier gas and according to
Preparatory setting sprays into coal dust inside blast furnace stock column, improves gas fluid distrbution and gas permeability, improves production efficiency.
The top of the multiple two-part pulverized coal gun is equipped with the roof beam structure for protecting the multiple two-part pulverized coal gun.
One is preferably set up mode, and the multiple two-part pulverized coal gun is circumferentially square from the blast-furnace shaft side-walls
To being horizontally inserted into after being uniformly distributed in the blast furnace.
Each two-part pulverized coal gun 2 includes furnace inner segment and furnace outer segment.
The spray gun side wall of the furnace inner segment is equipped with multiple assisted spray gun holes 201 of array arrangement.
The multiple assisted spray gun hole along furnace inner segment center in blast furnace end to blast furnace outside direction extend 0~
Array distribution on the side wall of 2.5m length areas.
The main function in assisted spray gun hole 201 described here is the coal gas improved in the 102 top region 1.5m of cohesive zone
The distribution of stream improves gas utilization rate (ηCO) etc..
The roof beam structure 3 is inlayed or is welded on the side wall of blast furnace 1, is placed in pulverized coal gun vertical upper, is crossed inside blast furnace.
The furnace outer segment is to connect pulverized coal conveying device.
Specifically, as shown in Figure 4: side wall of the multiple assisted spray gun hole 201 in the same cross section of the furnace inner segment
On be symmetric, and the spacing in assisted spray gun hole 201 for being located at different cross section differs, in close from being distributed in blast furnace to outside blast furnace
It spends gradually sparse.
A kind of preferred embodiment, the multiple assisted spray gun hole on the side wall of the furnace inner segment from blast furnace to height
The outer distribution density of furnace is gradually sparse.
It is emphasized that: the length of the furnace inner segment is A；
The blast furnace internal diameter of plane where the furnace inner segment is R；
There are following mathematical relationships with the R by the A:
In addition, vertical range of the furnace inner segment away from cohesive zone in the blast furnace is between 0.5~1.5m.
In order to buffer the impact of furnace charge and bear pressure in enough furnaces, the internal diameter of each two-part pulverized coal gun is situated between
Between 10~30mm, outer diameter is between 100~200mm, and assisted spray gun hole aperture is between 2~5mm.
One preferred embodiment, as shown in Figure 5: along the furnace inner segment on the side wall of furnace inner segment described in the present embodiment
Extending direction is equipped with two rows of assisted spray guns hole, and the two rows assisted spray gun hole is symmetricly set on the side wall of the furnace inner segment, this
In the direction of two rows of assisted spray gun holes coal injection in practical applications be flat in blast furnace where the furnace inner segment
Blowing in face, coal injection in the up and down direction not in blast furnace.
Due to the needs of actual working environment, the material of each two-part pulverized coal gun 2 described here is to be able to bear
The high temperature resistant material of 1200 DEG C of environment above temperature.
The quantity of two-part pulverized coal gun described in the present embodiment 2 is 2~20.
The distributor manifold pressure of coal rifle described in the present embodiment is 0.5~0.65MPa, and secondary air compensating gas source selects high pressure
Nitrogen, pressure about 1.5MPa.
Finally, as shown in Figure 3: roof beam structure described in the present embodiment includes multiple beam bones；
A umbrella stand shape structural body is formed by welding in the multiple beam bone；
Each beam bone is fixedly connected with the inner wall of the blast furnace；
Each beam bone can protect the furnace inner segment of a two-part pulverized coal gun from stock column in blast furnace
It influences, achievees the purpose that the furnace inner segment keeps parallel with horizontal line in the blast furnace.
The working principle of coal injection of the invention is described more detail below:
In detail, from furnace roof insertion two-part pulverized coal gun coal dust is injected to blast furnace inside after, coal dust is in carrier gas
Effect is lower more can be uniformly distributed to around blowing position, with CO in coal gas in furnace2The gasification reaction of carbon occurs for contact,
CO is generated, since the gasification reaction of coal dust consumes CO2, the amount that coke participates in gasification reaction is reduced, to protect to greatest extent
Coke has been protected, has been allowed to still maintain enough intensity.Coal rifle side wall can many places apertured (symmetrical Unequal distance along short transverse
Same Kong Pinggao, as shown in Figures 4 and 5: coal rifle rifle hole layout drawing), realize the blowing of short transverse wide scope.When 2~20 coal rifles from
Shaft side wall 103 is horizontally inserted into blast furnace after being distributed uniformly and circumferentially, due to the edge effect of coal rifle body of a gun tube wall, favorably
It circulates in the gas flow in blast furnace, thus improves the gas permeability of 1 stock column of blast furnace, improves coal gas at 1 inner radial R/3 of blast furnace
Flow distribution (referring to Fig. 6, is not inserted into two-stage type blowing breeze device and is inserted into 1 gas permeability of blast furnace of two-part pulverized coal gun coal dust
(wind speed) comparison diagram is detailed in the explanation of attached drawing 6), be conducive in radial away from the ore reduction at furnace wall R/3, and then improve coal gas
Utilization rate (ηCO), advantageously reduce fuel ratio.Due to improving Gas Flow away from circulation wall R/3 at, so helping to reduce height
Stock column pressure difference when furnace 1 operates, is conducive to 1 direct motion of blast furnace.The design of coal rifle can be achieved along short transverse 2.5m altitude range
Widely distributed region in coal powder injection simultaneously so that coal in high-temperature region in cohesive zone 102 top 1~3.5m (height 2.5m) range
Powder is more, and less in the more lower region of opposite upper parts temperature, is conducive to coal dust and is sufficiently vaporized.Away from furnace wall about R/3
Place is precisely indirect reduction maximum region, can participate in the CO of gasification reaction2At most, so coal dust gasification reaction consumes CO2, protect
Coke has been protected, has been allowed to still maintain enough intensity.Coal rifle described above refers to two-part pulverized coal gun 2.
In detail, Fig. 6 is the blast furnace for being not inserted into two-stage type blowing breeze device A and being inserted into two-stage type blowing breeze device B
Gas permeability (wind speed) comparison diagram (it is m/s that wherein, the longitudinal axis, which is wind speed axis unit, and abscissa is the average value of measurement point position).It is real
It tests under the conditions of room, measurement is not inserted into two-stage type blowing breeze device A and is inserted into the simulation height of two-stage type blowing breeze device B respectively
The gas permeability of furnace cohesive zone.Data comparison shows that the insertion of the coal rifle body of a gun has stronger edge effect, realizes air guide (wind) pipe
Effect.That is, bed permeability can be improved using this invention technology, improve gas fluid distrbution, the longitudinal axis is wind speed, horizontal axis in figure
It is taken a little for the row test of the diameter of a cross section in pulverized coal injection in blast furnace region excessively, A is not use experiment line of the invention, B
To use experiment line of the invention.Data comparison shows to be reduced to using maximal pressure force value after the technology of the present invention by 211.1kPa
207.6kPa reducing 1.66%.
For example: the volume of certain steel plant's blast furnace 1 is 1280m3, using this invention technology, two-part pulverized coal injection
Rifle 2 is consistent with device shown in attached drawing 1~5,12 spray guns (see shown in attached drawing 4~5) is shared, on blast furnace melting with soft 102
Portion, restoration of lower stack are symmetrical on the same circumference (see attached drawing 1~2) along shaft section.And properly control injection system
Operating parameter, in which:
1. single rifle blowing 350~650kg/h of amount, average 415kg/h；
2. controlling solid-gas ratio≤20kg/kg by secondary air compensating；
3. controlling jetting pressure PWind+ 50kPa~PWind+ 150kPa, average pressure PWind+106kPa。
Whole operation is continuously blown 30 days, and stifled rifle accident does not occur, and blast furnace 1 is averaged coal than increasing 11.5kg/tHM, coke ratio
Reduce 7.86kg/tHM, make pressure drop and permeability index (pbAnd ptRespectively wind pressure and press, Q are air quantity)
Equal sharp fall declines 4.06% and 5.01% compared with base period respectively；Improve gas utilization rate (ηCO) and slow down air port coke
5.12% and 2.89% is respectively increased compared with base period in strength deterioration.Two-part blowing obtains preferable metallurgical effect.
The technical principle of the invention is described above in combination with a specific embodiment, these descriptions are intended merely to explain of the invention
Principle shall not be construed in any way as a limitation of the scope of protection of the invention.Based on explaining herein, those skilled in the art
It can associate with other specific embodiments of the invention without creative labor, these modes fall within this hair
Within bright protection scope.
Claims (6)
1. a kind of two-part blast-furnace coal injection device, which is characterized in that including blast furnace and be arranged in more inside the blast furnace
A two-part pulverized coal gun；
The multiple two-part pulverized coal gun restoration of lower stack or furnace bosh upper portion side wall array from the blast furnace horizontal from outside to inside
The inside of the insertion blast furnace arranged evenly；
The multiple two-part pulverized coal gun is set as inner hollow and both ends connectivity structure, to by carrier gas by coal dust from outer
Boundary is blown the inside for entering the blast furnace along its internal hollow channel；
The top of the multiple two-part pulverized coal gun is equipped with the roof beam structure for protecting the multiple two-part pulverized coal gun；
The roof beam structure includes multiple beam bones；
A umbrella stand shape structural body is formed by welding in the multiple beam bone；
Each beam bone is fixedly connected with the inner wall of the blast furnace；
Each beam bone can protect the furnace inner segment of a two-part pulverized coal gun from the influence of stock column in blast furnace,
Achieve the purpose that the furnace inner segment keeps parallel with horizontal line in the blast furnace；
The multiple two-part pulverized coal gun along the circumferential direction uniformly divides from the blast-furnace shaft lower part or furnace bosh upper portion side wall
It is horizontally inserted into after cloth in the blast furnace；
Each two-part pulverized coal gun includes furnace inner segment and furnace outer segment；
The spray gun side wall of the furnace inner segment is equipped with multiple assisted spray gun holes of array arrangement；
The multiple assisted spray gun hole extends 0~2.5m to blast furnace outside direction along the end at furnace inner segment center in blast furnace
Array distribution on the side wall of length areas；
The furnace outer segment is to connect pulverized coal conveying device；
The multiple assisted spray gun hole is symmetric on the side wall of the same cross section of the furnace inner segment, and is located at different cut
The spacing in the assisted spray gun hole in face differs, in from distribution density is gradually sparse to outside blast furnace in blast furnace.
2. coal injection device as described in claim 1, which is characterized in that the length of the furnace inner segment is A；
The blast furnace internal diameter of plane where the furnace inner segment is R；
There are following mathematical relationships with the R by the A:
3. coal injection device as claimed in claim 2, which is characterized in that the furnace inner segment is away from cohesive zone in the blast furnace
Vertical range is between 0.5~1.5m.
4. coal injection device as described in claim 1, which is characterized in that the internal diameter of each two-part pulverized coal gun is situated between
Between 10~30mm, outer diameter is between 100~200mm, and assisted spray gun hole aperture is between 2~5mm.
5. coal injection device as claimed in claim 4, which is characterized in that each two-part pulverized coal gun and the beam
The material of frame is to be able to bear the high temperature resistant material of 1200 DEG C of environment above temperature.
6. coal injection device as claimed in claim 5, which is characterized in that the quantity of the two-part pulverized coal gun be 2~
20.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811378175.0A CN109161621B (en) | 2018-11-19 | 2018-11-19 | A kind of two-part blast-furnace coal injection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811378175.0A CN109161621B (en) | 2018-11-19 | 2018-11-19 | A kind of two-part blast-furnace coal injection device |
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| CN109161621B true CN109161621B (en) | 2019-11-05 |
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| CN112501373B (en) * | 2020-12-01 | 2022-08-23 | 上大新材料(泰州)研究院有限公司 | Blast furnace gas injection device, blast furnace gas injection system and method |
| CN115786606A (en) * | 2022-11-02 | 2023-03-14 | 中冶赛迪上海工程技术有限公司 | Blast furnace shaft blowing method |
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| US5333840A (en) * | 1991-01-17 | 1994-08-02 | SSAB Tunnplåt AB | Blast pipe and tuyere arrangement for a blast furnace and method |
| CN1300858A (en) * | 2000-11-23 | 2001-06-27 | 沈峰满 | Technology for smelting iron in blast furnace by two-segment blowing of powdered coal |
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