CN112981039A

CN112981039A - Scrap steel preheating system and working method

Info

Publication number: CN112981039A
Application number: CN202110194000.XA
Authority: CN
Inventors: 陈生利; 邓晖; 艾中路; 包锋; 匡洪锋
Original assignee: SGIS Songshan Co Ltd
Current assignee: SGIS Songshan Co Ltd
Priority date: 2021-02-20
Filing date: 2021-02-20
Publication date: 2021-06-18
Anticipated expiration: 2041-02-20
Also published as: CN112981039B

Abstract

The invention discloses a scrap steel preheating system and a working method thereof, wherein the scrap steel preheating system comprises an iron ladle, a supporting frame, a pipeline assembly, a baking assembly, a suspension assembly and a monitoring assembly, the pipeline assembly, the suspension assembly and the monitoring assembly are arranged on the supporting frame, the iron ladle can be moved into the supporting frame, the suspension assembly is used for suspending the baking assembly to the position right above the iron ladle, the pipeline assembly is detachably connected with the baking assembly, the pipeline assembly can supply combustible gas to the baking assembly, the combustible gas is sprayed out of the baking assembly and is combusted in the iron ladle, so that the temperature of the scrap steel in the iron ladle is raised, and the monitoring assembly can monitor the temperature of the scrap steel. The monitoring subassembly can monitor the scrap steel temperature in the iron ladle, makes the scrap steel preheat and can not generate more metallic oxide under the condition of higher temperature yet, and make full use of scrap steel resource is in order to realize cost reduction and increase, toasts and does not carry out the lug connection between subassembly and the iron ladle, consequently, need not to carry out structural transformation, convenient to use to current iron ladle.

Description

Scrap steel preheating system and working method

Technical Field

The invention relates to the technical field of iron making, in particular to a scrap steel preheating system and a working method.

Background

In the existing steel production process, in order to increase the molten iron capacity and simultaneously utilize waste steel resources, a large number of steel plants apply iron ladles to add waste steel and rely on high-temperature molten iron to melt the waste steel, so that the effects of reducing cost and increasing yield are achieved. However, the temperature of molten iron is inevitably reduced, and the energy consumption of the steelmaking process is influenced. Therefore, the scrap steel needs to be preheated before being melted by molten iron, the existing scrap steel preheating technology preheats the scrap steel through gas flame, the temperature is difficult to control, metal in the scrap steel is easy to oxidize, when the scrap steel is transported to a blast furnace for charging the molten iron, the scrap steel meets high-temperature molten iron, metal oxide is heated and decomposed, a large amount of gas is generated, boiling, rolling or even knocking is caused in the process of charging the molten iron, and the safety of molten iron packaging is threatened.

Therefore, how to bake and preheat the scrap steel in the iron ladle so that the temperature of the scrap steel in the iron ladle reaches a high state and excessive oxidation of the scrap steel is avoided is a problem to be solved urgently.

Disclosure of Invention

The invention aims to provide a scrap steel preheating system and a working method, which can preheat the scrap steel in an iron ladle to a higher temperature, avoid excessive oxidation of the scrap steel and fully utilize scrap steel resources.

In order to achieve the purpose, the invention adopts the following technical scheme:

on the one hand, provide a scrap steel system of preheating, including iron ladle, braced frame, pipeline component, toast the subassembly, suspend the subassembly and monitor the subassembly in midair, pipeline component suspend the subassembly in midair with the monitor subassembly sets up on the braced frame, the iron ladle is portable extremely in the braced frame, it is used for suspending in midair to suspend the subassembly in midair toasting extremely directly over the iron ladle, pipeline component with toast the subassembly and can dismantle the connection, pipeline component can to toast subassembly supply combustible gas, combustible gas follows toast the subassembly blowout and be in the burning in the iron ladle makes scrap steel in the iron ladle heaies up, the monitor subassembly can monitor the temperature of scrap steel.

As a preferable scheme of the present invention, the pipeline assembly includes a gas pipeline, a combustion air pipeline, a compressed air pipeline, an oxygen pipeline and a nitrogen pipeline, the gas pipeline, the combustion air pipeline, the compressed air pipeline and the oxygen pipeline are detachably connected to the baking assembly, and the nitrogen pipeline is connected to one end of the gas pipeline, which is far away from the baking assembly.

As a preferable scheme of the present invention, valves are disposed on the gas pipeline, the combustion air pipeline, the compressed air pipeline, the oxygen pipeline, and the nitrogen pipeline.

As a preferable scheme of the present invention, the suspension assembly includes a motor, a plurality of pulleys, a hook, and a sling, the motor and the pulleys are disposed on the support frame, the pulleys support and guide the sling, one end of the sling is connected to the motor, and the other end of the sling is connected to the hook.

As a preferable scheme of the invention, the baking assembly comprises a heat insulation plate, an annular pipe, a plurality of branch pipes and a plurality of burners, wherein the annular pipe is arranged on the heat insulation plate, the combustible gas is introduced into the annular pipe, the branch pipes are communicated with the annular pipe, the burners are arranged on the branch pipes and are communicated with the branch pipes, and the burners penetrate through the heat insulation plate.

As a preferable scheme of the invention, the number of the branch pipes and the number of the burners are three, and connecting lines among the burners form an equilateral triangle.

As a preferable scheme of the present invention, the support frame includes a frame main body, a ladder stand and a steel structure platform, the ladder stand is disposed on a side surface of the frame main body, and the steel structure platform is horizontally disposed on the frame main body.

As a preferable scheme of the invention, the scrap preheating system further comprises a rail and a trolley, the trolley can bear the iron ladle to move along the rail, and the rail is arranged on the ground below the supporting frame.

On the other hand, the working method of the scrap steel preheating system comprises the following steps:

s1, supplying coal gas and combustion-supporting air to a baking assembly, generating flame and baking the scrap steel in the iron ladle;

s2, supplying oxygen for supporting combustion and supplying compressed air for combustion regulation;

s3, stopping supplying coal gas, combustion-supporting air, oxygen and compressed air;

and S4, introducing nitrogen into the gas pipeline, and purging the gas pipeline.

In a preferred embodiment of the present invention, the scrap preheating system further comprises a gas pressure sensor and an alarm, and the alarm gives an alarm when the gas pressure sensor detects that the pressure of the combustible gas is lower than 3 kPa.

The invention has the beneficial effects that:

the monitoring assembly of the scrap steel preheating system can monitor the temperature of the scrap steel in the iron ladle, so that more metal oxides cannot be generated under the condition that the scrap steel is preheated to a higher temperature, scrap steel resources are fully utilized to realize cost reduction and efficiency improvement, the baking assembly is detachably connected with the pipeline assembly, the baking assembly is convenient to replace or maintain, and the baking assembly is not directly connected with the iron ladle, so that the existing iron ladle is not required to be structurally modified, and the scrap steel preheating system is convenient to use.

Drawings

FIG. 1 is a schematic side view of a scrap preheating system according to an embodiment of the present invention;

FIG. 2 is a schematic top view of FIG. 1;

FIG. 3 is a top view of a bake assembly in accordance with an embodiment of the present invention.

In the figure:

1. iron ladle; 2. a support frame; 21. a frame body; 22. climbing a ladder; 23. a steel structure platform; 3. a conduit assembly; 31. a gas pipeline; 32. a combustion air conduit; 33. a compressed air conduit; 34. an oxygen pipeline; 35. a nitrogen gas pipeline; 4. a baking assembly; 41. a heat insulation plate; 42. an annular tube; 43. a branch pipe; 44. burning a nozzle; 45. a combustion controller; 5. a monitoring component; 61. a motor; 62. a pulley; 63. a hook; 64. a sling; 7. a trolley is provided.

Detailed Description

The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the word "over" a first feature or feature in a second feature may include the word "over" or "over" the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "under" a second feature may include a first feature that is directly under and obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

As shown in fig. 1 and 2, the scrap preheating system of an embodiment includes an iron ladle 1, a supporting frame 2, a pipeline assembly 3, a baking assembly 4, a monitoring assembly 5, and a suspension assembly, where the pipeline assembly 3, the monitoring assembly 5, and the suspension assembly are disposed on the supporting frame 2, the iron ladle 1 is movable into the supporting frame 2, the suspension assembly is used to suspend the baking assembly 4 directly above the iron ladle 1, the pipeline assembly 3 is detachably connected to the baking assembly 4, the pipeline assembly 3 can supply combustible gas to the baking assembly 4, the combustible gas is ejected from the baking assembly 4 and burned in the iron ladle 1, so as to heat up scrap in the iron ladle 1, and the monitoring assembly 5 can monitor the temperature of the scrap. The monitoring assembly 5 comprises an infrared thermometer or other kind of temperature detecting instrument to monitor the temperature of the scrap.

The monitoring subassembly 5 of the scrap steel preheating system of this embodiment can monitor the scrap steel temperature in the iron ladle 1, make the scrap steel preheated to also can not generate more metallic oxide under the condition of higher temperature, make full use of scrap steel resource is in order to realize the cost reduction and increase, it can dismantle with pipeline assembly 3 and be connected to toast subassembly 4, conveniently replace or maintenance work to toasting subassembly 4, toast and not carry out the lug connection between subassembly 4 and the iron ladle 1, therefore, need not to carry out structural transformation to current iron ladle 1, high durability and convenient use.

Preferably, the duct assembly 3 comprises a gas duct 31, a combustion air duct 32, a compressed air duct 33, an oxygen duct 34 and a nitrogen duct 35, the gas duct 31, the combustion air duct 32, the compressed air duct 33 and the oxygen duct 34 are detachably connected with the roasting assembly 4, and the nitrogen duct 35 is connected with one end of the gas duct 31 far away from the roasting assembly 4. The oxygen pipeline 34 can make the gas burning more sufficient, improve the heating efficiency, the compressed air can make the temperature everywhere in the iron ladle 1 comparatively even, prevent the heat from concentrating in the part, improve the preheating quality of scrap steel. The nitrogen pipeline 35 can exhaust residual gas in the gas pipeline 31 after preheating of the scrap steel is finished, so that the safety of the production process is improved.

The pipeline assembly 3 and the baking assembly 4 can be connected through a metal hose, later maintenance and spare part replacement are facilitated, and the part, easy to be heated, of the metal hose is protected through heat insulation materials.

Furthermore, valves are arranged on the gas pipeline 31, the combustion air pipeline 32, the compressed air pipeline 33, the oxygen pipeline 34 and the nitrogen pipeline 35, so that independent supply and cut-off of various gases are realized, whether the various gases are supplied or not and the supply flow rate can be adjusted in real time according to the current waste steel preheating condition, and the waste steel preheating is well completed.

Specifically, the suspension assembly comprises a motor 61, a plurality of pulleys 62, a lifting hook 63 and a lifting cable 64, wherein the motor 61 and the pulleys 62 are arranged on the supporting frame 2, the lifting cable 64 is supported and guided by the pulleys 62, one end of the lifting cable 64 is connected with the motor 61, and the other end of the lifting cable 64 is connected with the lifting hook 63. By selecting the appropriate pulley 62 attachment location on the support frame 2, the slings 64 can be positioned along the surface of the support frame 2, the slings 64 being less likely to interfere with other components and being replaced to the ground by the suspension assembly when maintenance of the toasting assembly 4 is required.

As shown in FIG. 3, it is preferable that the toasting assembly 4 comprises a heat shield plate 41, a circular pipe 42, three branch pipes 43 and three burners 44, wherein the circular pipe 42 is provided on the heat shield plate 41, the combustible gas is introduced into the circular pipe 42, the branch pipes 43 are communicated with the circular pipe 42, the burners 44 are provided on the branch pipes 43 and are communicated with the branch pipes 43, and the burners 44 penetrate through the heat shield plate 41. The combustible gas, which is a mixture of gas and air, is introduced into the annular pipe 42, distributed to the branch pipes 43, and then ejected from the burners 44. The burner 44 in this embodiment is further provided with a burner controller 45 for igniting the combustible gas. The insulation panels 41 may be made of a composite structure to obtain better fire resistance, for example, the insulation panels 41 are made of stainless steel and rock wool, and one side of the stainless steel plate is covered with rock wool, and the side where the rock wool is located faces the ladle 1.

The connecting lines among the three burners 44 in this embodiment form an equilateral triangle, and the generated flame can cover a large range, and has a good preheating effect on the scrap steel in the ladle 1. Of course, the number of the branch pipes 43 and the burners 44 is not limited to three, and the number of the branch pipes 43 and the burners 44 is not less than one.

In some embodiments, the baking assembly 4 further comprises a flame detector (not shown in the figures) arranged on the side of the heat-insulating plate 41 close to the ladle 1, and when the flame detector detects that the flame inside the ladle 1 is extinguished, a corresponding signal is sent, and the system then cuts off the gas supply.

Preferably, the support frame 2 includes a frame body 21, a ladder 22 and a steel structure platform 23, the ladder 22 is disposed at a side of the frame body 21, and the steel structure platform 23 is horizontally disposed on the frame body 21. The ladder 22 is accessible for the operator to climb and the steel platform 23 is accessible for the operator to stand, so that the operator can perform the relevant operations on the support frame 2 with respect to the pipe assembly 3 and the baking assembly 4.

The scrap preheating system of this embodiment further includes a carriage 7 and a rail (not shown), the carriage 7 can carry the ladle 1 and move along the rail, and the rail is disposed on the ground below the support frame 2. The supporting frame 2 can be arranged below a blast furnace casting house, high-temperature molten iron can be poured into the iron ladle 1 in a short time after the scrap steel in the iron ladle 1 is preheated, and the temperature of the scrap steel is prevented from being reduced too much.

The embodiment of the invention also provides a working method of the scrap steel preheating system, which comprises the following steps:

s1, supplying coal gas and combustion-supporting air to a baking assembly 4, generating flame and baking the scrap steel in the iron ladle 1;

s4, introducing nitrogen into the gas pipeline 31, and purging the gas pipeline 31.

The oxygen can make coal gas burn more fully, improves heating efficiency, and the compressed air can make the temperature everywhere in the iron ladle 1 comparatively even, prevents that the heat from concentrating at local, improves the preheating quality of scrap steel. After preheating of the scrap steel is finished, nitrogen is introduced into the gas pipeline 31, so that residual gas in the gas pipeline 31 can be emptied, and the safety of the production process is improved.

Further, the scrap preheating system further includes a gas pressure sensor (not shown) and an alarm (not shown), and the alarm gives an alarm when the gas pressure sensor detects that the pressure of the combustible gas is lower than 3 kPa. When the pressure of the combustible gas is too low, the back fire is easy to occur to cause accidents, so that a corresponding sensor is required to be arranged to find the condition that the pressure of the combustible gas is too low in time, and the accidents are avoided.

The support frame 2 can be also provided with a suction device to suck away smoke dust generated in the preheating process, thereby reducing environmental pollution. In addition, camera equipment can be arranged on the supporting frame 2, so that remote real-time monitoring is carried out, and the safety of the production process is improved.

Reference throughout this specification to the description of the terms "preferred," "further," or the like, as used in describing preferred embodiments of the present invention, means that a particular feature, structure, material, or characteristic described in connection with the example or illustration is included in at least one example or illustration of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above examples are only intended to illustrate the details of the invention, which is not limited to the above details, i.e. it is not intended that the invention must be implemented in such detail. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.

Claims

1. The utility model provides a scrap steel preheating system, its characterized in that includes the iron ladle, braced frame, pipeline assembly, toasts the subassembly, suspends the subassembly and monitors the subassembly in midair, pipeline assembly suspend the subassembly in midair with the monitoring subassembly sets up on the braced frame, the iron ladle is portable extremely in the braced frame, it is used for suspending in midair to suspend the subassembly in midair toast the subassembly extremely directly over the iron ladle, pipeline assembly with toast the subassembly and can dismantle the connection, pipeline assembly can to toast the subassembly and supply combustible gas, combustible gas follows toast the subassembly blowout and be in the burning in the iron ladle makes scrap steel in the iron ladle heaies up, monitoring subassembly can monitor the temperature of scrap steel.

2. The scrap steel preheating system according to claim 1, wherein the pipeline assembly comprises a gas pipeline, a combustion air pipeline, a compressed air pipeline, an oxygen pipeline and a nitrogen pipeline, the gas pipeline, the combustion air pipeline, the compressed air pipeline and the oxygen pipeline are detachably connected with the baking assembly, and the nitrogen pipeline is connected with one end of the gas pipeline, which is far away from the baking assembly.

3. The scrap steel preheating system according to claim 2, wherein valves are provided on the gas line, the combustion air line, the compressed air line, the oxygen line and the nitrogen line.

4. The scrap preheating system according to claim 1, wherein the suspension assembly includes a motor, a plurality of pulleys, a hook, and a sling, the motor and the pulleys are disposed on the support frame, the pulleys support and guide the sling, one end of the sling is connected to the motor, and the other end of the sling is connected to the hook.

5. The scrap preheating system according to claim 1, wherein the baking assembly comprises a heat insulation plate, an annular pipe, a plurality of branch pipes and a plurality of burners, the annular pipe is arranged on the heat insulation plate, the combustible gas is introduced into the annular pipe, the branch pipes are communicated with the annular pipe, the burners are arranged on the branch pipes and are communicated with the branch pipes, and the burners penetrate through the heat insulation plate.

6. The scrap preheating system according to claim 5, wherein the number of the branch pipes and the number of the burners are three, and a connecting line between the burners forms an equilateral triangle.

7. The scrap preheating system according to claim 1, wherein the support frame includes a frame body, a ladder stand provided at a side of the frame body, and a steel structure platform horizontally provided on the frame body.

8. The scrap preheating system according to claim 1 further comprising a track and a trolley, the trolley carrying the iron ladle for movement along the track, the track being disposed on the ground below the support frame.

9. An operating method applied to the scrap preheating system according to claim 2, characterized by comprising the steps of:

10. The method of operating a scrap preheating system according to claim 9, wherein the scrap preheating system further comprises a gas pressure sensor and an alarm, and the alarm gives an alarm when the gas pressure sensor detects that the pressure of the combustible gas is lower than 3 kPa.