CN111139325B - Non-bell material distribution center coking compensation method - Google Patents

Non-bell material distribution center coking compensation method Download PDF

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CN111139325B
CN111139325B CN202010072322.2A CN202010072322A CN111139325B CN 111139325 B CN111139325 B CN 111139325B CN 202010072322 A CN202010072322 A CN 202010072322A CN 111139325 B CN111139325 B CN 111139325B
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coke
chute
ring position
center
unit
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CN111139325A (en
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车玉满
郭天永
孙鹏
姜喆
姚硕
费静
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Angang Steel Co Ltd
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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
    • C21B5/007—Conditions of the cokes or characterised by the cokes used
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2300/00—Process aspects

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Abstract

The invention relates to a non-bell material distribution center coking compensation method, which comprises the following steps: 1) calculating the total number of turns and total time consumption of each coke distribution system,Coke weight distribution speed per second; 2) calculating the coke adding amount of the center:
Figure DDA0002377611900000011
3) judging the inclination angle of the chute at the innermost ring position of coke in a specific distribution system: beta is ain＝βi(ii) a 4) The amount of center coke addition offset is calculated. The advantages are that: the coke pile size is fixed in the central area of the furnace top, so that the central gas flow is stabilized, and the stable and smooth operation of the blast furnace is maintained; the radial O/C distribution achieves the design target, the shape of the charge level is stable, and no ore rolls into the center.

Description

Non-bell material distribution center coking compensation method
Technical Field
The invention belongs to the field of blast furnace top distribution, and particularly relates to a bell-less distribution center coking compensation method.
Background
The central coke adding technology is characterized in that a certain amount of coke is added to the center of a blast furnace at the tail end of the distributed coke by selecting a proper inclination angle on the basis of a certain distribution matrix from the furnace top in the distribution process, a coke pile with a fixed size is formed in a central area, the ore-coke ratio of the central area is reduced, the central air permeability in the furnace is improved, the central air flow is stable, the CO partial pressure of the central area is increased, the central carbon dissolution reaction of a high-temperature area is inhibited, the dead center material column is well updated in an acceleration manner, the air permeability and the liquid permeability of the dead center material column are improved, the active working state of a furnace cylinder is ensured, and the stable and smooth operation of the blast furnace is maintained. However, when the center coke-charging distribution operation is specifically executed, the chute inclination angle needs to be rotated from the innermost and outermost ring positions to the center coke-charging ring position, the rotation time needs 18 s-38 s, and in the time period, part of coke falls into the area between the innermost ring position and the center coke-charging ring position, so that the actual center coke-charging quantity is insufficient, and the effect often cannot reach the expected purpose.
Chinese patent (patent number: CN201410124675.7) sets the periodic ratio of normal charging and central charging of a blast furnace to be 3:1, namely 1 whole batch of coke is added to the center 1 time after 3 periods of normal charging. Literature "theoretical research on Central coking technology" (author: Yulenan, Fangying, Zhejiang metallurgy 2)009 years 1) introduction of Hangzhou steel 750m3The blast furnace adopts the periodic central coke-charging to obtain the actual effect. The method has the defects that the central gas flow, the speed and the temperature are easy to fluctuate due to the periodical central coking and the unfixed continuous quantity of the central coking.
The central coke-charging method (patent number: CN201010197018.7) for the bell-less top multi-ring matrix material distribution of the blast furnace in Chinese patent is that on the basis of the multi-ring matrix material distribution method, more than 50% of coke is firstly distributed in the central area of the blast furnace, so that the thickness of the central coke is larger than that of the edge coke. The method has the defects that the central feeding amount is too much, so that the central material column is enlarged, a large amount of coal gas flows out from the center, the coal gas utilization rate is low, and the consumption of the blast furnace coke is high.
In the document "discussion of distribution mechanism and distribution mode of material for central coke oven of blast furnace" (author: Zhao national Lei, Cheng tree son, Xun, etc.; stage 2016 (6) of Steel), three-dimensional mathematical model of composite motion of charge particles is used to calculate charge drop point distribution and radial ore-coke ratio distribution when coke is fully charged at 13 ° and is charged at 20 ° and small angle, it is considered that part of charge will be distributed in the middle zone during central coke charging, so that the actual central coke charging is reduced, the effective central coke rates of both are 49.4% and 70.4%, and a through central coke column region with a diameter of about 1.2m is formed in the former mode, while a larger range with a central diameter of about 2.5m is formed under the latter condition. The document 'exploration of suitable central coke-charging amount of first steel Jing Tang 2 blast furnace' (author: Zhengyuping, 2016 (4) year) introduces the influence of different central coke-charging amounts of Jing Tang 2 blast furnace on the working state of blast furnace hearth, gas utilization rate and fuel consumption, when the central coke-charging amount is increased to 20% -25%, the furnace condition is obviously worsened, the gas utilization rate is reduced, the fuel ratio is increased, and the hearth activity is reduced; when the central coke adding amount is stabilized at 10-12%, the blast furnace is operated smoothly and the coal gas utilization rate is increased to 48-49%. The above references only describe the appropriate ring tilt angle for center focusing and the number of center focusing designs.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a bell-less distribution center coking compensation method, which is used for compensating the defect of insufficient actual center coking quantity caused by partial coke falling into a middle area when a chute inclination angle is rotated to a center coking ring position from the innermost and outermost ring positions. The coke piles with fixed sizes are formed in the central area, so that the stability of central airflow is ensured, the air permeability and the liquid permeability of dead material columns are improved, and the stable and smooth operation of the blast furnace is maintained.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a coke-charging compensation method for a bell-less cloth center comprises the following steps:
1) calculating the total number of turns, total time consumption and coke distributing weight speed per second of each coke distributing system
Calculating the total number of turns C of coke distribution in a primary distribution systemt：
Figure BDA0002377611890000021
In the formula (1), CiEach distribution ring position is distributed with coke turns Ci，i＝1,2,3…11；
The chute rotation speed is 7.5s consumed for 1 circle of rotation, and then the total consumed time t of 1 material distribution, unit s:
t＝7.5Ct (2)
coke burden weight velocity per second v, unit t/s:
Figure BDA0002377611890000022
in the formula (3), PcThe specific distribution system of the blast furnace is the coke batch weight, unit t;
2) calculating the coke quantity P added in the center1The unit t:
Figure BDA0002377611890000023
3) judging the inclination angle beta of the chute at the innermost ring position of coke according to a specific distribution systeminUnit °:
βin＝βi (5)
at this time, C is satisfiedi>0, and Ci-1＝0；
In the formula (5), betaiThe inclination angle of each distribution ring position chute is unit degrees, i is 1,2,3 … 11;
4) calculating center coke addition offset
As the chute spirally rotates from the innermost ring position to the central focusing ring position, the inclination angle of the chute is changed from big to small, and the change amplitude delta beta of the inclination angle is in unit degrees:
Δβ＝βin-β1 (6)
because of the transmission machinery, the chute inclination angle variation speed omega, unit degree/s, namely when the chute spirally rotates to the central focusing ring position from the innermost ring position, the chute rotation needs time delta t, and the unit s is:
Δt＝ωΔβ (7)
in the formula (7), ω is 1.2 °/s to 1.5 °/s
The coke falls to the central ring position from the innermost ring position within the time delta t required by the rotation of the chute1The unit t:
P1＝vΔt (8)
thus, P1Is the amount of center focus that needs to be compensated.
Compared with the prior art, the invention has the beneficial effects that:
the blast furnace material distribution system adopts a central coke feeding quantity compensation method, and the quantity of coke to be compensated falls into the middle area. The coke pile size is fixed in the central area of the furnace top, so that the central gas flow is stabilized, and the stable and smooth operation of the blast furnace is maintained. Laboratory experiments and simulation calculation results show that the radial O/C distribution achieves the design target, the material surface shape is stable, and no ore rolls into the center.
Detailed Description
The present invention is described in detail below, but it should be noted that the practice of the present invention is not limited to the following embodiments.
The first embodiment is as follows:
the coke-charging compensation method for the bell-less material distribution center comprises the following steps: set coke batch weight PcThe inclination angles of the chute 11 ring positions (i ═ 1,2,3 … 11) are respectively as follows: beta is a1＝13°、β2＝18.8°、β3＝21.8°、β4＝24.8°、β5＝27°、β6＝29.5°、β7＝32°、β8＝34.3°、β9＝36.5°、β10＝38.8°、β1140.1 °; 11 ring position cloth circles of chute: c1＝4、C2＝0、C3＝0、C4＝0、C5＝0、C6＝2、C7＝2、C8＝3、C9＝3、C10＝2、C11＝0。
1. Total number of turns C of coke distribution in distribution systemtSubstituted for formula (1):
Figure BDA0002377611890000031
the rotating speed of the chute is 7.5s consumed for each 1-turn rotation, and the formula (2) is substituted, so that the total consumed time t of each 1-time material distribution is 7.5Ct＝120s；
The coke weight distribution speed per second is substituted for the formula (3),
Figure BDA0002377611890000041
2. calculating the coke adding amount of the center, and substituting the formula (4):
Figure BDA0002377611890000042
3. judging the chute inclination angle of the innermost ring position of the coke, and substituting the formula (5):
βin＝29.5°。
4. the change range of the inclination angle of the ring position from the innermost ring position to the center focusing is as follows:
Δβ＝βin-β116.5 °; due to the transmission mechanism, the variation speed of the chute inclination angle is 1.2 °/s-1.5 °/s, the chute rotation needs time, and the method is carried in (7):
Δ t ═ ω Δ β ═ 19.80s (in this example ω ═ 1.2 °/s)
The coke falls to the number of the central ring positions from the innermost ring position within the time delta t required by the rotation of the chute, and the coke is carried into a formula (8):
P1＝vΔt＝2.099t
therefore, the coke batch weight needs to be reset:
Pt＝Pc+P114.799t, take 14.8 t.
Example two:
the coke-charging compensation method for the bell-less material distribution center comprises the following steps:
set coke batch weight Pc13.4t, the chute 11 ring positions (i is 1,2,3 … 11), and the chute inclination angles are respectively: beta is a1＝11.5°、β2＝18.3°、β3＝21.3°、β4＝24.3°、β5＝26.5°、β6＝29.0°、β7＝31.5°、β8＝33.8°、β9＝36.0°、β10＝38.3°、β1139.6 °; 11 ring position cloth circles of chute: c1＝3、C2＝0、C3＝0、C4＝0、C5＝2、C6＝2、C7＝2、C8＝2、C9＝2、C10＝2、C11＝0。
1. Total number of turns of coke distribution (C) according to distribution systemt)：
Figure BDA0002377611890000043
The rotating speed of the chute is 7.5s consumed for each 1-turn rotation, and the total consumed time t of each 1-time material distribution is 7.5Ct＝112.5s；
Coke weight distribution per second
Figure BDA0002377611890000051
2. Calculating the coke adding amount of the center:
Figure BDA0002377611890000052
3. judging the chute inclination angle of the innermost ring position of coke: beta is ain＝26.5°。
4. The change range of the inclination angle of the ring position from the innermost ring position to the center focusing is as follows:
Δβ＝βin-β1＝15.5°；
due to the transmission mechanism, the variation speed of the chute inclination angle is 1.2 degrees/s-1.5 degrees/s, and the chute rotation needs time:
Δ t ═ ω Δ β ═ 23.25s (in this example ω ═ 1.5 °/s)
Within the time delta t required by the rotation of the chute, the coke falls from the innermost ring position to the central ring position by the amount:
P1＝vΔt＝2.767t
therefore, the coke batch weight needs to be reset:
Pt＝Pc+P116.167t, take 16.2 t.

Claims (1)

1. A non-bell material distribution center coking compensation method is characterized by comprising the following steps:
1) calculating the total number of turns, total time consumption and coke distributing weight speed per second of each coke distributing system
Calculating the total number of turns C of coke distribution in a primary distribution systemt：
Figure FDA0003046551110000011
In the formula (1), CiEach distribution ring position is distributed with coke turns Ci，i＝1,2,3…11；
The chute rotation speed is 7.5s consumed for 1 circle of rotation, and then the total consumed time t of 1 material distribution, unit s:
t＝7.5Ct (2)
coke burden weight velocity per second v, unit t/s:
Figure FDA0003046551110000012
in the formula (3), PcThe specific distribution system of the blast furnace is the coke batch weight, unit t;
2) calculating the coke quantity P added in the center1The unit t:
Figure FDA0003046551110000013
3) judging the inclination angle beta of the chute at the innermost ring position of coke according to a specific distribution systeminUnit °:
βin＝βi (5)
at this time, C is satisfiedi>0, and Ci-1＝0；
In the formula (5), betaiThe inclination angle of each distribution ring position chute is unit degrees, i is 1,2,3 … 11;
4) calculating center coke addition offset
As the chute spirally rotates from the innermost ring position to the central focusing ring position, the inclination angle of the chute is changed from big to small, and the change amplitude delta beta of the inclination angle is in unit degrees:
Δβ＝βin-β1 (6)
because of the transmission machinery, the chute inclination angle variation speed omega, unit degree/s, namely when the chute spirally rotates to the central focusing ring position from the innermost ring position, the chute rotation needs time delta t, and the unit s is:
Δt＝Δβ/ω (7)
in the formula (7), ω is 1.2 °/s to 1.5 °/s
The coke falls to the central ring position from the innermost ring position within the time delta t required by the rotation of the chute1The unit t:
P1＝vΔt (8)
thus, P1Is the amount of center focus that needs to be compensated.
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CN112609029B (en) * 2020-11-09 2022-07-19 鞍钢股份有限公司 Method for smelting medium coke in high proportion in large bell-less blast furnace
CN112662825A (en) * 2020-12-21 2021-04-16 山东钢铁集团日照有限公司 Material distribution method for adjusting air flow distribution of blast furnace center
CN113136465A (en) * 2021-04-14 2021-07-20 鞍钢股份有限公司 Material distribution method for preventing middle coke from being distributed into center of blast furnace
CN113136467B (en) * 2021-04-15 2022-06-14 鞍钢股份有限公司 Efficient central focusing matrix setting method based on charge level iteration
CN113174451A (en) * 2021-04-15 2021-07-27 鞍钢股份有限公司 Control method for pre-loading distribution of blast furnace burden

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Publication number Priority date Publication date Assignee Title
JP2006336094A (en) * 2005-06-06 2006-12-14 Jfe Steel Kk Apparatus and method for charging raw material into blast furnace
CN101880739A (en) * 2010-06-02 2010-11-10 首钢总公司 Bell-less top multi-ring matrix burden distribution central coke charging method of blast furnace
CN104694680A (en) * 2015-03-18 2015-06-10 江苏省沙钢钢铁研究院有限公司 Control method of blast furnace charge layer structural radial distribution
CN108642219A (en) * 2018-04-24 2018-10-12 武汉钢铁有限公司 A method of improving blast furnace top gas temperature
CN108959760A (en) * 2018-06-29 2018-12-07 首钢京唐钢铁联合有限责任公司 A kind of method and device of great-jump-forward centre plus burnt cloth

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006336094A (en) * 2005-06-06 2006-12-14 Jfe Steel Kk Apparatus and method for charging raw material into blast furnace
CN101880739A (en) * 2010-06-02 2010-11-10 首钢总公司 Bell-less top multi-ring matrix burden distribution central coke charging method of blast furnace
CN104694680A (en) * 2015-03-18 2015-06-10 江苏省沙钢钢铁研究院有限公司 Control method of blast furnace charge layer structural radial distribution
CN108642219A (en) * 2018-04-24 2018-10-12 武汉钢铁有限公司 A method of improving blast furnace top gas temperature
CN108959760A (en) * 2018-06-29 2018-12-07 首钢京唐钢铁联合有限责任公司 A kind of method and device of great-jump-forward centre plus burnt cloth

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