CN114836591B - Method for composite roasting of scrap steel by top blowing and bottom side suction of scrap steel tank - Google Patents
Method for composite roasting of scrap steel by top blowing and bottom side suction of scrap steel tank Download PDFInfo
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- CN114836591B CN114836591B CN202210482661.7A CN202210482661A CN114836591B CN 114836591 B CN114836591 B CN 114836591B CN 202210482661 A CN202210482661 A CN 202210482661A CN 114836591 B CN114836591 B CN 114836591B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 200
- 239000010959 steel Substances 0.000 title claims abstract description 200
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000007664 blowing Methods 0.000 title claims abstract description 23
- 239000002131 composite material Substances 0.000 title claims description 14
- 239000001301 oxygen Substances 0.000 claims abstract description 63
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 63
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 62
- 239000007789 gas Substances 0.000 claims abstract description 19
- 239000003034 coal gas Substances 0.000 claims abstract description 3
- 238000004321 preservation Methods 0.000 claims abstract 2
- 238000009413 insulation Methods 0.000 claims description 41
- 238000010438 heat treatment Methods 0.000 abstract description 8
- 238000003723 Smelting Methods 0.000 abstract description 5
- 239000012530 fluid Substances 0.000 abstract description 2
- 239000002699 waste material Substances 0.000 description 30
- 238000002485 combustion reaction Methods 0.000 description 29
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 24
- 238000007789 sealing Methods 0.000 description 22
- 229910052742 iron Inorganic materials 0.000 description 12
- 239000002184 metal Substances 0.000 description 12
- 229910052751 metal Inorganic materials 0.000 description 12
- 230000006835 compression Effects 0.000 description 6
- 238000007906 compression Methods 0.000 description 6
- 239000012535 impurity Substances 0.000 description 6
- 238000011084 recovery Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000003647 oxidation Effects 0.000 description 5
- 238000007254 oxidation reaction Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 206010022000 influenza Diseases 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004861 thermometry Methods 0.000 description 1
Classifications
-
- 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
- C21C5/56—Manufacture of steel by other methods
- C21C5/562—Manufacture of steel by other methods starting from scrap
- C21C5/565—Preheating of scrap
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The utility model discloses a method for baking scrap steel by combining top blowing and bottom side suction of a scrap steel tank, which belongs to the technical field of steel smelting and comprises the following steps: loading the scrap steel into a scrap steel groove with a heat preservation layer, and then hanging the scrap steel groove on a tank car, so that a convex joint on the tank car is inserted into a concave joint of a suction main pipe at the bottom of the scrap steel groove; introducing coal gas and oxygen into the oxygen burning gun, baking the steel scraps by using the oxygen burning gun, and exhausting and guiding hot gas to flow downwards by using an exhaust fan to preheat the steel scraps to finish the baking of the steel scraps; by utilizing the characteristics of air fluid, the top blowing, baking and lower air suction modes are adopted, and a part of heating gas flows from top to bottom through the steel scrap gaps, so that the purposes of upper heating and lower preheating of steel scrap are realized, the upper and lower temperatures of the steel scrap are uniform, the efficiency is higher, and the heat resource is fully utilized; the preheated scrap steel enters the converter, so that the converting efficiency of the converter is improved while the scrap steel ratio is improved, and the aims of reducing cost and improving efficiency are fulfilled.
Description
Technical Field
The utility model belongs to the technical field of steel smelting, and particularly relates to a method for baking scrap steel by combining top blowing and bottom side suction of a scrap steel tank.
Background
The method is an important renewable resource for steel plants, and has important significance for improving the steel yield, replacing iron ores, reducing energy consumption and reducing cost.
In the prior art, the three main categories are classified. The first type is baking of molten iron tank waste steel, such as a device for preheating the waste steel on line in the molten iron tank, wherein the device is applied to CN201921810043.0, the waste steel in the molten iron tank is baked and heated by utilizing the idle waiting time of the molten iron tank, carbonized rice hulls are sprayed to the surface of the waste steel after the waste steel is heated, the preheated waste steel is insulated, and a converter heat source is increased. According to the scheme, due to reasons of railway transportation and the like, iron cannot be connected in time after baking, and the temperature loss can be avoided inevitably due to the need of scheduling and waiting. The smelting method for improving the scrap ratio by preheating scrap in a ladle through an oxygen burning gun has the application number of CN201910796847.8, the method has the advantages that the scrap amount is limited due to lower baking temperature, the added diced coke can provide heat, but the blowing time of a converter can be prolonged, and the molten iron temperature can be lost by 30-50 ℃ each time when molten iron is folded.
The second type is in-converter heating, such as in the prior art, an operation method for baking scrap steel in a converter with the application number of CN202011198171.1 and a coal-oxygen gun for baking scrap steel in a converter with the application number of CN202022420656.2 of the attached utility model, wherein the scrap steel is heated in the converter by using coal gas, so that the temperature loss of a transferring link is eliminated, but as all the feeding and baking tasks are completed in one container of the converter, the smelting period of the converter is prolonged, and the efficiency of the converter is reduced.
The third type is to additionally add baking and heating equipment, such as a movable scrap preheating device with the application number of CN201921756432.X in the prior art, the scrap is preheated by utilizing the heat of converter slag, the temperature is limited only by means of radiation heating due to limited heat of the converter slag, and the scrap is added into a steel ladle after a converter, so that the stability of the quality of varieties can be potentially threatened.
In the prior art, various means such as a rotary kiln, a box furnace, a hot metal ladle and the like are utilized to bake the scrap steel, so that the ratio of the scrap steel entering the converter is increased. However, the methods are mainly used for baking the scrap steel around the hot metal ladle and then receiving the molten iron, and the bulk specific gravity of the scrap steel is often less than 1.0t/m due to the limited volume of the hot metal ladle 3 Considering that enough clearance is reserved when molten iron is received, the actual scrap steel loading amount of the molten iron tank is generally less than 1/10 of the nominal capacity of the molten iron tank. Therefore, in order to improve the steel scrap ratio of the converter in a large range, the steel scrap roasting function is required to be additionally arranged on the steel scrap groove, so that the steel scrap ratio is increased, the temperature of the converter is greatly increased, the blowing loss is reduced, the quality of molten steel is improved, and a composite roasting mode for top blowing gas heating and bottom side air suction of the steel scrap groove is provided.
Aiming at the characteristics and limitations of the prior art, the method for baking the scrap steel by combining top blowing and bottom side suction of the scrap steel tank is provided.
Disclosure of Invention
The utility model aims to provide a method for baking scrap steel by combining top blowing and bottom side suction of a scrap steel tank, which aims to solve the problems in the background technology.
The aim of the utility model can be achieved by the following technical scheme:
a method for baking scrap steel by composite roasting of scrap steel tank top-blowing bottom side suction comprises the following steps:
step one: filling scrap steel into a scrap steel groove of a scrap steel baking device, then hanging the scrap steel groove on a tank car, enabling a convex joint on the tank car to be inserted into a concave joint of a suction header pipe at the bottom of the scrap steel groove, and enabling the convex joint to be in sealing connection with the concave joint under the elastic force of a spring and the sealing action of a sealing ring; the convex joint is limited on the tank wagon by the fastener, the upward and downward free sliding is realized under the conditions of compression and deformation recovery of the spring, and the spring and the metal hose can slow down the impact of the scrap steel tank on the convex joint when falling down.
Step two: introducing gas into the oxygen burning guns, and controlling the gas flow rate of each oxygen burning gun to be 1000-2000Nm 3 And/h, the oxygen flow is 600-1200Nm 3 /h；
Step three: and (3) baking the steel scraps above the steel scraps grooves by using an oxygen burning gun, exhausting air through the bottom side air suction holes by using an exhaust fan, guiding hot air to downwards preheat the steel scraps, and simultaneously avoiding the steel scraps impurities from blocking the bottom side air suction holes to finish the baking of the steel scraps.
The steel scrap baking device comprises a baking cover, a steel scrap groove and a tank car, wherein the baking cover is arranged above the steel scrap groove, and the tank car is arranged below the steel scrap groove;
the baking cover is provided with a plurality of oxygen burning guns in an array manner, and the baking cover is also provided with a plurality of exhaust dust removal flues in an array manner; the scrap steel groove comprises a heat insulation layer formed by a steel plate provided with supporting ribs and a light heat insulation blanket; the side section of the scrap steel groove is arc-shaped, the bottom of the scrap steel groove is provided with an air suction main pipe, and a plurality of air suction branch pipes are arranged on the air suction main pipe in an array manner; two sides of the scrap steel groove are symmetrically provided with a plurality of bottom side air suction holes for connecting corresponding air suction branch pipes;
the center of the top of the tank wagon is provided with a connecting component, the connecting component comprises a convex joint and a fastening piece, the fastening piece is in sliding connection with the convex joint, and the fastening piece is fixedly connected with the tank wagon; the convex joint is sleeved with a spring, and the spring is positioned between the convex part of the convex joint and the fastener; the convex part of the convex joint is provided with a sealing ring, and the convex part of the suction manifold corresponding to the convex joint is provided with a concave joint; one end of the tank wagon is provided with an exhaust fan, an exhaust opening of the exhaust fan is connected with an air suction straight pipe, and one end of the convex joint, which is far away from the convex part, is connected with the air suction straight pipe through a metal hose.
Further, the heat insulation layer is a light heat insulation blanket.
Further, the number of the oxygen burning guns is 4-8, and the distance between two adjacent oxygen burning guns is 1.2-2.5m.
The utility model has the beneficial effects that:
the waste steel tank adopts a heat insulation design, so that the internal high temperature and the external cooling structural strength are ensured to be safe; the suction header pipe joint at the bottom of the scrap steel tank is connected with the convex joint on the tank car by adopting the concave joint, and the outer side of the convex joint is provided with a sealing ring, so that the butt joint sealing is realized, and the manual plugging is avoided; the convex joint part is provided with a spring, so that impact on the convex joint when the travelling crane falls down the scrap steel groove is buffered, and the convex joint is tightly connected with the concave joint under the return force of the spring, so that the tightness is ensured; and after the baking is finished, the scrap steel tank is lifted to a smelting position of the converter by a crane for the next working procedure. According to the utility model, by utilizing the characteristics of air fluid, the top blowing, baking and lower air suction modes are adopted, and a part of heating gas flows from top to bottom through the waste steel gaps, so that the purposes of upper heating and lower preheating of waste steel are realized, the upper and lower temperatures of the waste steel are uniform, the efficiency is higher, and the heat resource is fully utilized; the preheated scrap steel enters the converter, so that the converting efficiency of the converter is improved while the scrap steel ratio is improved, and the aims of reducing cost and improving efficiency are fulfilled.
Drawings
The utility model is further described below with reference to the accompanying drawings.
FIG. 1 is a schematic view of a scrap roasting apparatus according to the present utility model;
FIG. 2 is a schematic view of the structure of the bottom of the scrap box receptacle of the present utility model;
FIG. 3 is a schematic view of the internal structure of the scrap box receptacle of the present utility model;
fig. 4 is an enlarged view of a portion of fig. 1 a of the present utility model.
In the figure: 1. baking the cover; 2. an oxygen burning gun; 3. a scrap steel tank; 4. a bottom suction hole; 5. an air suction branch pipe; 6. an intake manifold; 7. a tank car; 8. a female connector; 9. a seal ring; 10. a male connector; 11. a spring; 12. a fastener; 13. a metal hose; 14. a straight suction pipe; 15. an exhaust fan; 16. a thermal insulation layer; 17. a support rib; 18. and (5) exhausting and dedusting a flue.
Detailed Description
The technical solutions of the embodiments of the present utility model will be clearly and completely described below in conjunction with the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1 to 4, the steel scrap roasting device of the present utility model comprises a roasting cover 1, a steel scrap tank 3 and a tank wagon 7, wherein the roasting cover 1 is arranged above the steel scrap tank 3, and the tank wagon 7 is arranged below the steel scrap tank 3;
a plurality of oxygen burning guns 2 are arranged on the baking cover 1 in an array manner, and a plurality of exhaust dust removal flues 18 are also arranged on the baking cover 1 in an array manner; the scrap steel tank 3 comprises a heat insulation layer 16 formed by a steel plate provided with supporting ribs 17 and a light heat insulation blanket; the side section of the scrap steel groove 3 is arc-shaped, the bottom of the scrap steel groove 3 is provided with an air suction main pipe 6, and a plurality of air suction branch pipes 5 are arranged on the air suction main pipe 6 in an array manner; the two sides of the scrap steel tank 3 are symmetrically provided with a plurality of bottom side air suction holes 4 for connecting corresponding air suction branch pipes 5, and the bottom side air suction holes 4 are not arranged at the bottommost part of the scrap steel tank 3;
the center of the top of the tank car 7 is provided with a connecting component which comprises a convex joint 10 and a fastening piece 12, wherein the fastening piece 12 is in sliding connection with the convex joint 10, and the fastening piece 12 is fixedly connected with the tank car 7; the convex joint 10 is sleeved with a spring 11, and the spring 11 is positioned between the convex part of the convex joint 10 and the fastener 12; the convex part of the convex joint 10 is provided with a sealing ring 9, and the convex part of the suction manifold 6 corresponding to the convex joint 10 is provided with a concave joint 8; one end of the tank car 7 is provided with an exhaust fan 15, an exhaust opening of the exhaust fan 15 is connected with an air suction straight pipe 14, and one end of the convex joint 10, which is far away from the convex part, is connected with the air suction straight pipe 14 through a metal hose 13.
The utility model adopts the modes of baking the top of the scrap steel tank 3 and sucking air at the bottom, utilizes hot air to preheat the lower scrap steel, improves the uniformity of baking the upper and lower layers of the scrap steel, and ensures the safety of the internal high temperature and external cooling structural strength by adopting a double-layer heat insulation design for the scrap steel tank 3.
Example 1
A method for baking scrap steel by composite roasting of scrap steel tank top-blowing bottom side suction comprises the following steps:
step one: loading 45t scrap steel into the scrap steel tank 3, then hanging the scrap steel tank 3 on the tank car 7, enabling a convex joint 10 on the tank car 7 to be inserted into a concave joint 8 of a suction header pipe 6 at the bottom of the scrap steel tank 3, and enabling the convex joint 10 to be in sealing connection with the concave joint 8 under the elastic force of a spring 11 and the sealing effect of a sealing ring 9; the male connector 10 is limited on the tank car 7 by the fastener 12, and can slide freely up and down under the compression and deformation recovery conditions of the spring 11, and the spring 11 and the metal hose 13 can slow down the impact of the scrap box receptacle 3 on the male connector 10 when falling.
The waste steel tank 3 is of a structure that two layers of steel plates sandwich a heat insulation layer 16, the thickness of the heat insulation layer 16 is 50mm, the heat insulation layer 16 is a light heat insulation blanket, an outer layer of steel plate plays a role in supporting and hoisting, and an inner layer of steel plate plays a role in high-temperature oxidation resistance; the supporting ribs 17 of the two layers of steel plates are arranged in a staggered way; the bottom suction holes 4 penetrate through the steel plate and the light heat insulation blanket.
And 40 bottom side air suction holes 4 are arranged on each row on two sides of the scrap steel groove 3, and the diameter of each bottom side air suction hole 4 is 40mm.
Step two: 5 oxygen combustion guns 2 are arranged on the baking cover 1, and the distance between each oxygen combustion gun and each oxygen combustion gun is 1.8m; introducing gas into the oxygen combustion guns 2, and controlling the gas flow rate of each oxygen combustion gun 2 to be 1200Nm 3 /h, oxygen flow of 700Nm 3 /h；
Step three: the waste steel is baked for 10min by an oxygen burning gun 2, and is exhausted by an exhaust fan 15, hot air is guided to flow downwards to preheat the waste steel, and meanwhile, the phenomenon that waste steel impurities block an air suction hole 4 at the bottom side is avoided.
Example 2
A method for baking scrap steel by composite roasting of scrap steel tank top-blowing bottom side suction comprises the following steps:
step one: filling 40t of scrap steel into the scrap steel tank 3, then hanging the scrap steel tank 3 on the tank car 7, enabling a convex joint 10 on the tank car 7 to be inserted into a concave joint 8 of a suction header pipe 6 at the bottom of the scrap steel tank 3, and enabling the convex joint 10 to be in sealing connection with the concave joint 8 under the elastic force of a spring 11 and the sealing effect of a sealing ring 9; the male connector 10 is limited on the tank car 7 by the fastener 12, and can slide freely up and down under the compression and deformation recovery conditions of the spring 11, and the spring 11 and the metal hose 13 can slow down the impact of the scrap box receptacle 3 on the male connector 10 when falling.
The waste steel tank 3 is of a structure that two layers of steel plates sandwich a heat insulation layer 16, the thickness of the heat insulation layer 16 is 50mm, the heat insulation layer 16 is a light heat insulation blanket, an outer layer of steel plate plays a role in supporting and hoisting, and an inner layer of steel plate plays a role in high-temperature oxidation resistance; the supporting ribs 17 of the two layers of steel plates are arranged in a staggered way; the bottom suction holes 4 penetrate through the steel plate and the light heat insulation blanket.
And 40 bottom side air suction holes 4 are arranged on each row on two sides of the scrap steel groove 3, and the diameter of each bottom side air suction hole 4 is 40mm.
Step two: 5 oxygen combustion guns 2 are arranged on the baking cover 1, and the distance between each oxygen combustion gun and each oxygen combustion gun is 1.8m; introducing gas into the oxygen combustion guns 2, and controlling the gas flow rate of each oxygen combustion gun 2 to be 1800Nm 3 /h, oxygen flow of 1000Nm 3 /h；
Step three: the waste steel is baked for 10min by an oxygen burning gun 2, and is exhausted by an exhaust fan 15, hot air is guided to flow downwards to preheat the waste steel, and meanwhile, the phenomenon that waste steel impurities block an air suction hole 4 at the bottom side is avoided.
Example 3
A method for baking scrap steel by composite roasting of scrap steel tank top-blowing bottom side suction comprises the following steps:
step one: loading 42t scrap steel into the scrap steel tank 3, then hanging the scrap steel tank 3 on the tank car 7, enabling the convex joint 10 on the tank car 7 to be inserted into the concave joint 8 of the suction manifold 6 at the bottom of the scrap steel tank 3, and enabling the convex joint 10 to be in sealing connection with the concave joint 8 under the elastic force of the spring 11 and the sealing effect of the sealing ring 9; the male connector 10 is limited on the tank car 7 by the fastener 12, and can slide freely up and down under the compression and deformation recovery conditions of the spring 11, and the spring 11 and the metal hose 13 can slow down the impact of the scrap box receptacle 3 on the male connector 10 when falling.
The waste steel tank 3 is of a structure that two layers of steel plates sandwich a heat insulation layer 16, the thickness of the heat insulation layer 16 is 50mm, the heat insulation layer 16 is a light heat insulation blanket, an outer layer of steel plate plays a role in supporting and hoisting, and an inner layer of steel plate plays a role in high-temperature oxidation resistance; the supporting ribs 17 of the two layers of steel plates are arranged in a staggered way; the bottom suction holes 4 penetrate through the steel plate and the light heat insulation blanket.
And 40 bottom side air suction holes 4 are arranged on each row on two sides of the scrap steel groove 3, and the diameter of each bottom side air suction hole 4 is 40mm.
Step two: 5 oxygen combustion guns 2 are arranged on the baking cover 1, and the distance between each oxygen combustion gun and each oxygen combustion gun is 1.8m; introducing gas into the oxygen combustion guns 2, and controlling the gas flow rate of each oxygen combustion gun 2 to be 1500Nm 3 /h, oxygen flow of 700Nm 3 /h；
Step three: the waste steel is baked for 10min by an oxygen burning gun 2, and is exhausted by an exhaust fan 15, hot air is guided to flow downwards to preheat the waste steel, and meanwhile, the phenomenon that waste steel impurities block an air suction hole 4 at the bottom side is avoided.
Example 4
A method for baking scrap steel by composite roasting of scrap steel tank top-blowing bottom side suction comprises the following steps:
step one: loading 42t scrap steel into the scrap steel tank 3, then hanging the scrap steel tank 3 on the tank car 7, enabling the convex joint 10 on the tank car 7 to be inserted into the concave joint 8 of the suction manifold 6 at the bottom of the scrap steel tank 3, and enabling the convex joint 10 to be in sealing connection with the concave joint 8 under the elastic force of the spring 11 and the sealing effect of the sealing ring 9; the male connector 10 is limited on the tank car 7 by the fastener 12, and can slide freely up and down under the compression and deformation recovery conditions of the spring 11, and the spring 11 and the metal hose 13 can slow down the impact of the scrap box receptacle 3 on the male connector 10 when falling.
The waste steel tank 3 is of a structure that two layers of steel plates sandwich a heat insulation layer 16, the thickness of the heat insulation layer 16 is 50mm, the heat insulation layer 16 is a light heat insulation blanket, an outer layer of steel plate plays a role in supporting and hoisting, and an inner layer of steel plate plays a role in high-temperature oxidation resistance; the supporting ribs 17 of the two layers of steel plates are arranged in a staggered way; the bottom suction holes 4 penetrate through the steel plate and the light heat insulation blanket.
And 40 bottom side air suction holes 4 are arranged on each row on two sides of the scrap steel groove 3, and the diameter of each bottom side air suction hole 4 is 40mm.
Step two: 4 oxygen combustion guns 2 are arranged on the baking cover 1, and each oxygen combustion gun is 2.5m apart; introducing gas into the oxygen combustion guns 2, and controlling the gas flow rate of each oxygen combustion gun 2 to be 1000Nm 3 /h, oxygen flow 600Nm 3 /h；
Step three: the waste steel is baked for 10min by an oxygen burning gun 2, and is exhausted by an exhaust fan 15, hot air is guided to flow downwards to preheat the waste steel, and meanwhile, the phenomenon that waste steel impurities block an air suction hole 4 at the bottom side is avoided.
Example 5
A method for baking scrap steel by composite roasting of scrap steel tank top-blowing bottom side suction comprises the following steps:
step one: loading 42t scrap steel into the scrap steel tank 3, then hanging the scrap steel tank 3 on the tank car 7, enabling the convex joint 10 on the tank car 7 to be inserted into the concave joint 8 of the suction manifold 6 at the bottom of the scrap steel tank 3, and enabling the convex joint 10 to be in sealing connection with the concave joint 8 under the elastic force of the spring 11 and the sealing effect of the sealing ring 9; the male connector 10 is limited on the tank car 7 by the fastener 12, and can slide freely up and down under the compression and deformation recovery conditions of the spring 11, and the spring 11 and the metal hose 13 can slow down the impact of the scrap box receptacle 3 on the male connector 10 when falling.
The waste steel tank 3 is of a structure that two layers of steel plates sandwich a heat insulation layer 16, the thickness of the heat insulation layer 16 is 50mm, the heat insulation layer 16 is a light heat insulation blanket, an outer layer of steel plate plays a role in supporting and hoisting, and an inner layer of steel plate plays a role in high-temperature oxidation resistance; the supporting ribs 17 of the two layers of steel plates are arranged in a staggered way; the bottom suction holes 4 penetrate through the steel plate and the light heat insulation blanket.
And 40 bottom side air suction holes 4 are arranged on each row on two sides of the scrap steel groove 3, and the diameter of each bottom side air suction hole 4 is 40mm.
Step two: 8 oxygen combustion guns 2 are arranged on the baking cover 1, and the distance between each oxygen combustion gun and each oxygen combustion gun is 1.2m; introducing gas into the oxygen combustion guns 2, and controlling the gas flow rate of each oxygen combustion gun 2 to be 2000Nm 3 /h, oxygen flow of 1200Nm 3 /h；
Step three: the waste steel is baked for 10min by an oxygen burning gun 2, and is exhausted by an exhaust fan 15, hot air is guided to flow downwards to preheat the waste steel, and meanwhile, the phenomenon that waste steel impurities block an air suction hole 4 at the bottom side is avoided.
Comparative example 1
The scrap steel is baked by the steps of:
step one: filling 42t scrap steel into a scrap steel groove 3, wherein the scrap steel groove 3 is of a structure that two layers of steel plates sandwich a heat insulation layer 16, the thickness of the heat insulation layer 16 is 50mm, the heat insulation layer 16 is a light heat insulation blanket, and supporting ribs 17 of the two layers of steel plates are arranged in a staggered manner;
step two: 8 oxygen combustion guns 2 are arranged on the baking cover 1, and the distance between each oxygen combustion gun and each oxygen combustion gun is 1.2m; introducing gas into the oxygen combustion guns 2, and controlling the gas flow rate of each oxygen combustion gun 2 to be 2000Nm 3 /h, oxygen flow of 1200Nm 3 /h；
Step three: the scrap was baked with an oxygen lance 2 for 10min.
The temperature of the surface and bottom of the scrap steel in examples 1 to 5 was monitored by infrared thermometry, as shown in Table 1:
TABLE 1
As can be seen from table 1, in comparative example 1, the surface temperature of the scrap and the bottom temperature of the scrap were both smaller than those of example 5 and the surface temperature of the scrap and the bottom temperature of the scrap were greatly different from each other under the same parameters of the oxygen lance and the baking time as those of example 5 without using the method of top-blowing bottom side-suction composite baking the scrap. The temperature difference between the surface temperature of the scrap and the temperature of the bottom of the scrap in examples 1 to 5 was small, and the scrap at the bottom of the scrap tank could be baked to not less than 600 c with a baking time of 10 minutes.
It should be noted that in this document, terms such as "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. The method for composite roasting of the scrap steel by top blowing and bottom side suction of the scrap steel tank is characterized by comprising the following steps of:
step one: loading scrap steel into a scrap steel groove (3) with a heat preservation layer, and then hanging the scrap steel groove (3) on a tank car (7), so that a convex joint (10) on the tank car (7) is inserted into a concave joint (8) of a suction main pipe (6) at the bottom of the scrap steel groove (3);
step two: introducing coal gas and oxygen into the oxygen burning gun (2), baking the steel scraps by using the oxygen burning gun (2), exhausting by using an exhaust fan (15) through an air suction hole (4) at the bottom side, guiding hot air to flow downwards to preheat the steel scraps, and finishing baking the steel scraps.
2. The method for roasting scrap steel by composite top-blowing and bottom-sucking in a scrap steel tank as claimed in claim 1, wherein the gas flow rate of each oxygen lance (2) is 1000-2000Nm 3 /h。
3. The method for top-blowing, bottom-sucking and composite-roasting scrap steel in a scrap steel tank as claimed in claim 1, wherein the oxygen flow is 600-1200Nm 3 /h。
4. The method for composite roasting of scrap steel by top blowing and bottom side suction of scrap steel tank as claimed in claim 1, wherein the scrap steel tank (3) is structured by sandwiching heat insulation layers (16) by steel plates at both sides, and the heat insulation layers (16) are light heat insulation blankets.
5. The method for baking scrap steel by top-blowing bottom-sucking composite according to claim 1, wherein the number of the oxygen burning guns (2) is 4-8, and the distance between adjacent oxygen burning guns (2) is 1.2-2.5m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| GB1121741A (en) * | 1964-11-12 | 1968-07-31 | Armco Steel Corp | Preheating scrap with controlled oxidation |
| CN101225914A (en) * | 2008-02-03 | 2008-07-23 | 王铁川 | Automatic abutting joint for gas pipe |
| CN201605289U (en) * | 2010-01-22 | 2010-10-13 | 宝钢集团新疆八一钢铁有限公司 | Argon-blowing connection structure of steel ladle disassembled and assembled without manpower |
| CN207062316U (en) * | 2017-05-04 | 2018-03-02 | 华北理工大学 | Pneumatic steelmaking steel scrap bucket |
| CN212199320U (en) * | 2020-05-16 | 2020-12-22 | 河北矿冶建设工程集团有限公司 | Sealing system is toasted to steel scrap |
| CN212655813U (en) * | 2020-05-08 | 2021-03-05 | 河北矿冶重机有限公司 | Fixed sealed type scrap steel baking device and converter scrap steel continuous preheating system |
| CN113528744A (en) * | 2020-04-15 | 2021-10-22 | 河北亚吉工程技术有限公司 | Continuous preheating system for converter scrap steel |
| CN214792481U (en) * | 2021-09-07 | 2021-11-19 | 河南威猛振动设备股份有限公司 | Novel material baking trough |
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Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1121741A (en) * | 1964-11-12 | 1968-07-31 | Armco Steel Corp | Preheating scrap with controlled oxidation |
| CN101225914A (en) * | 2008-02-03 | 2008-07-23 | 王铁川 | Automatic abutting joint for gas pipe |
| CN201605289U (en) * | 2010-01-22 | 2010-10-13 | 宝钢集团新疆八一钢铁有限公司 | Argon-blowing connection structure of steel ladle disassembled and assembled without manpower |
| CN207062316U (en) * | 2017-05-04 | 2018-03-02 | 华北理工大学 | Pneumatic steelmaking steel scrap bucket |
| CN113528744A (en) * | 2020-04-15 | 2021-10-22 | 河北亚吉工程技术有限公司 | Continuous preheating system for converter scrap steel |
| CN212655813U (en) * | 2020-05-08 | 2021-03-05 | 河北矿冶重机有限公司 | Fixed sealed type scrap steel baking device and converter scrap steel continuous preheating system |
| CN212199320U (en) * | 2020-05-16 | 2020-12-22 | 河北矿冶建设工程集团有限公司 | Sealing system is toasted to steel scrap |
| CN214792481U (en) * | 2021-09-07 | 2021-11-19 | 河南威猛振动设备股份有限公司 | Novel material baking trough |
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| CN114836591A (en) | 2022-08-02 |
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