CN112981026A - Arrangement method of blast furnace drying hot air guide pipe - Google Patents
Arrangement method of blast furnace drying hot air guide pipe Download PDFInfo
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- CN112981026A CN112981026A CN202110200872.2A CN202110200872A CN112981026A CN 112981026 A CN112981026 A CN 112981026A CN 202110200872 A CN202110200872 A CN 202110200872A CN 112981026 A CN112981026 A CN 112981026A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B9/00—Stoves for heating the blast in blast furnaces
- C21B9/10—Other details, e.g. blast mains
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Abstract
The invention discloses a method for arranging hot air guide pipes of a blast furnace, which considers the change characteristics of a hot air flow field in the process of drying the blast furnace, provides a clear method for determining the distribution quantity of each ring belt of the hot air guide pipes and the distribution principle of the hot air guide pipes on each ring belt, further reasonably arranges the hot air guide pipes on the cross section of a hearth of the blast furnace, realizes the uniform heating of a hearth brick lining in the process of drying the furnace, and can effectively ensure the uniform heating of the hearth refractory material in the process of drying the furnace and improve the effect of drying the furnace.
Description
Technical Field
The invention relates to a method for arranging hot air guide pipes of a blast furnace, in particular to a method for reasonably arranging the hot air guide pipes in the process of baking the blast furnace in ferrous metallurgy.
Background
The lining of the blast furnace body contains a large amount of water in refractory and slurry in the building process, and the blast furnace production is always in a high-temperature working environment from the start of production. The blast furnace is a closed container which works at high temperature for a long time, and the temperature is kept as stable as possible. In order to adapt the lining refractory material to the smelting environment in the blast furnace as soon as possible and exert the function of protecting the blast furnace body, the blast furnace needs to be baked before the blast furnace is ignited so as to thoroughly remove most of water on the body and increase the consolidation strength of the body, so that the blast furnace is ignited smoothly and put into operation. The hot-blast furnace that blows into from the wind gap during blast furnace baker, hot-blast pipe is connected in the wind gap, extend along the horizontal direction in the blast furnace, extend to perpendicular downturning 90 behind four clitellum of different distances, continue downwardly extending to the low 850 ~ 1000mm distance of stove, three steel bar welding of equidistance are used in the export of hot-blast pipe lower extreme, with stove bottom contact bottom for diameter 220 mm's round steel, weld hot-blast shielding plate on the hot-blast pipe horizontal end that stretches out from the wind gap, hot-blast shielding plate is apart from 800 ~ 1000mm apart from the brickwork. The temperature of the hot air is utilized to gradually raise the temperature of the moisture in the body, and finally the moisture is discharged from the exhaust hole and the waste gas outlet in the form of water vapor. The problem to be solved in the field is that the cracking of the furnace lining is easily caused by the non-uniform heating speed.
Disclosure of Invention
The invention aims to provide a method for arranging hot air guide pipes of a blast furnace, which aims at providing a method for reasonably distributing the hot air guide pipes in the process of drying the blast furnace by researching the distribution characteristics of a hot air flow field in the process of drying the blast furnace, namely, according to the characteristics of the size of the furnace and the uniform distribution requirement of hot air, the heating area of each hot air guide pipe is determined through the simulation analysis of the hot air flow field, and then the hot air guide pipes are reasonably distributed on the cross section of a hearth of the blast furnace, so that the uniform heating of a hearth brick lining in the process of drying the furnace is realized.
The invention provides a method for arranging a hot air guide pipe of a blast furnace, which considers the change characteristics of a hot flow field in the process of drying the blast furnace and provides a clear method: firstly, the distribution quantity of the ring belts of each hot air conduit and the distribution principle of the hot air conduits on each ring belt are determined, and then the hot air conduits are reasonably distributed on the cross section of the furnace hearth of the blast furnace, so that the uniform heating of the brick lining of the furnace hearth in the furnace baking process is realized.
The reasonable arrangement of the hot air guide pipes on the cross section of the blast furnace hearth in the process of drying the blast furnace is the key for ensuring that the furnace achieves the expected effect, the hot air guide pipes are uniformly and reasonably distributed, hot air can uniformly reach the surface of the hearth, the temperature of moisture in the refractory material built in the blast furnace hearth can be gradually increased, and finally the moisture is discharged from the exhaust holes and the waste gas outlet in the form of steam. If refractory material can not the thermally equivalent, can produce great stress field when the programming rate is inhomogeneous, can destroy the overall structure of furnace lining when stress is too concentrated, overall structure is not destroyed even if the baker time, but because the heating is inhomogeneous, moisture evaporation is inhomogeneous in refractory material, after blast furnace is put into operation, under high temperature high pressure environment, refractory material moisture evaporation will seriously influence the structure of brick lining. The invention fully considers the distribution characteristics of hot air flow field in the process of drying the blast furnace, deduces a method for reasonably distributing hot air guide pipes so as to ensure that refractory materials of a furnace hearth are uniformly heated in the process of drying the furnace, and the idea of the method is shown in figure 1: according to the area and the inner diameter of the innermost ring, the distribution quantity of the ring belts of each hot air conduit and the distribution principle of the hot air conduits on each ring belt are firstly determined, and then the hot air conduits are reasonably distributed on the cross section of the hearth of the blast furnace, so that the uniform heating of the brick lining of the hearth in the furnace baking process is realized.
The method comprises the following specific operation steps:
(1) determining the area of the innermost ring hot air duct area, wherein the selection range is 10-15 m2And calculating the distance between the innermost ring hot air guide pipe and the furnace wall according to the determined area of the central area:
Scenter of a ship: area of central area in furnace without hot air duct arrangement, unit m3;
R1: the radius corresponding to the area of the innermost ring hot air duct area is unit m;
(2) the distances among other hot air conduit ring belts are arranged at equal intervals according to the distance between the innermost ring belt and the furnace wall, and the distance L between every two rings is determined according to the number of the hot air conduit ring belts:
l: the distance between each ring of the hot air guide pipes is m;
Rfurnace hearth: radius of blast furnace hearth in m;
R1: the radius corresponding to the area of the innermost ring hot air duct area is unit m;
(3) calculating the total circumference of the ring belts of the hot air duct according to the number of the ring belts arranged on the hot air duct and the radius of each ring belt:
Si=2π[Ri+(i-1)×L]
Stotal annulus: the sum of the circumferences of the ring belts arranged on the hot air guide pipes is m;
Si: the circumference of the ith ring belt hot air duct is m; wherein i: represents a hot air duct ring belt, and the innermost ring is 1 from inside to outside; (i represents the hot air duct ring zone, if the hot air duct ring zone is divided into 4 rings, the innermost ring is 1, the outermost ring is 4, the sum of the circumferences of the 4 rings is obtained by the formula, STotal annulus=S1+S2+S2+S4,S1Is the innermost circumference, S4Is the outermost ring perimeter);
(4) calculating the number of the hot air ducts arranged on each ring belt according to the sum of the circumferences of the ring belts arranged on the hot air ducts and the total number of the hot air ducts:
Sspacer: two hot air ducts on the same ring belt are spaced by m;
Tgeneral assembly: the total number of hot air duct arrangements;
mi: the number of the hot air ducts is arranged on each ring belt;
Si: representing the circumference of the i-th annulus hot-air duct, e.g. S1Is the innermost circumference, S4The outermost ring circumference.
(5) And arranging the distribution of the hot air guide pipes on each ring belt according to the calculated number of the ring hot air guide pipes and the equal interval principle.
The invention has the beneficial effects that:
the layout of the hot air guide pipes can be reasonably distributed in the preparation of the oven, so that the hot air in the cylinder area is ensured to be uniformly fed in the oven process; the water in the refractory material built in the blast furnace hearth can be gradually heated, and finally the water is discharged from the exhaust hole and the waste gas outlet in the form of water vapor; the refractory material of the furnace hearth is uniformly heated, and the integral structure of the refractory material of the furnace hearth is not damaged during furnace drying.
Drawings
FIG. 1 is a block diagram of the arrangement process of hot air ducts of a blast furnace.
FIG. 2 is a layout view of blast furnace hot blast ducts in example 1.
In the figure: a is a furnace core, B is a furnace wall, C is the outlet position of the hot air conduit, and L is the distance between adjacent ring belts of the hot air conduit.
Detailed Description
The following examples further illustrate embodiments of the present invention, but the embodiments of the present invention are not limited to the following examples.
The invention fully considers the distribution characteristics of hot air flow field in the process of drying the blast furnace, deduces a method for reasonably distributing hot air guide pipes so as to ensure that refractory materials of a furnace hearth are uniformly heated in the process of drying the furnace, and the idea of the method is shown in figure 1: according to the area and the inner diameter of the innermost ring, the distribution quantity of the ring belts of each hot air conduit and the distribution principle of the hot air conduits on each ring belt are firstly determined, and then the hot air conduits are reasonably distributed on the cross section of the hearth of the blast furnace, so that the uniform heating of the brick lining of the hearth in the furnace baking process is realized.
In the hot air duct layout process in the furnace baking process of a certain blast furnace, the diameter of a furnace hearth of the blast furnace is 14.1 meters, the hot air ducts are arranged in 4 layers, and the area of an innermost ring hot air duct ring belt is selected to be 8m3Is represented by the following formula
The radius of the innermost ring hot air duct was determined to be 1.6 m. Because the hot air ducts are arranged in four rings according to a formula
The spacing between each ring of hot air ducts is determined. Therefore, the total ring length of the four-ring hot air duct is as follows:
the number of the hot air ducts for the oven is 33, so that the spacing and the arrangement number of the hot air ducts on each ring belt can be calculated.
According to the calculation result, considering that more slurry is used for the side wall of the overhaul, the number of the hot air guide pipes of each ring belt is finely adjusted, and the number of the hot air guide pipes of each ring belt is as shown above. The final hot air duct layout is shown in fig. 2.
The statistics of the water content in the process of building the blast furnace are shown in table 1, the natural evaporation of the water content is not considered in the total water content, and the statistical water discharge condition after the furnace baking is finished is shown in table 2.
TABLE 1 distribution chart of water content for building refractory
Position of | Water content (ton) |
Refractory material for blast furnace body | 61.5 |
Hot air main pipe and surrounding pipe | 75 |
Ascending pipe and descending pipe | 55 |
Total (not considering natural evaporation) | 191.5 |
TABLE 2 statistics of water displacement during oven drying
As can be seen from the table, after the hot air guide pipes are reasonably arranged by adopting the method, the effect of baking the blast furnace is good, and the moisture entering in the masonry process is basically baked and discharged.
Claims (2)
1. A method for arranging a hot air guide pipe of a blast furnace drying oven is characterized by comprising the following steps: the change characteristics of the hot flow field in the process of baking the blast furnace are considered, and a clear method is given: firstly, the distribution quantity of the ring belts of each hot air conduit and the distribution principle of the hot air conduits on each ring belt are determined, and then the hot air conduits are reasonably distributed on the cross section of the furnace hearth of the blast furnace, so that the uniform heating of the brick lining of the furnace hearth in the furnace baking process is realized.
2. The method of arranging a blast furnace hot air duct according to claim 1, wherein: the specific operation steps are as follows:
(1) determining the area of the innermost ring hot air duct area, wherein the selection range is 10-15 m2And calculating the distance between the innermost ring hot air guide pipe and the furnace wall according to the determined area of the central area:
Scenter of a ship: area of central area in furnace without hot air duct arrangement, unit m3;
R1: the area radius of the innermost ring hot air duct area is m;
(2) the distances among other hot air conduit ring belts are arranged at equal intervals according to the distance between the innermost ring belt and the furnace wall, and the distance L between every two rings is determined according to the number of the hot air conduit ring belts:
l: the distance between each ring of the hot air guide pipes is m;
Rfurnace hearth: radius of blast furnace hearth in m;
R1: the area radius of the innermost ring hot air duct area is m;
n: the number of the girdle bands;
(3) calculating the total circumference of the ring belts of the hot air duct according to the number of the ring belts arranged on the hot air duct and the radius of each ring belt:
Si=2π[Ri+(i-1)×L]
Stotal annulus: the sum of the circumferences of the ring belts arranged on the hot air guide pipes is m;
Si: circumference of the ith annulus hot air duct, in m, where i: represents a hot air duct ring belt, and the innermost ring is 1 from inside to outside; (4) calculating the number of the hot air ducts arranged on each ring belt according to the sum of the circumferences of the ring belts arranged on the hot air ducts and the total number of the hot air ducts:
Sspacer: two hot air ducts on the same ring belt are spaced by m;
Tgeneral assembly: the total number of hot air duct arrangements;
mi: the number of the hot air ducts is arranged on each ring belt;
Si: circumference of the ith annulus hot air duct;
(5) and arranging the distribution of the hot air guide pipes on each ring belt according to the calculated number of the ring hot air guide pipes and the equal interval principle.
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Cited By (1)
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CN115044723A (en) * | 2022-04-25 | 2022-09-13 | 广东韶钢松山股份有限公司 | Blast furnace baking device and blast furnace baking process |
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