CN116334377A - Combined heating process structure and heating method of steel rolling heating furnace - Google Patents

Abstract

The invention relates to a steel rolling heating furnace combined heating process structure and a heating method, wherein the steel rolling heating furnace combined heating process structure comprises at least one gas heating furnace, an electric induction heating device is arranged at an inlet or an outlet of the gas heating furnace and is used for heating or supplementing heat before rolling a steel billet, and the axial direction of the electric induction heating device is perpendicular to the axial direction of the gas heating furnace. The invention solves the problems of high energy consumption and high pollutant emission of the steel rolling gas heating furnace, adopts a combined heating process, namely a combined heating process of gas heating and electric induction heating, realizes the purposes of greatly reducing emission and applying green electricity technology, replaces a part of heating functions of the gas heating furnace by electric induction heating, and is used for reducing the smoke emission of the gas heating furnace.

Description

Combined heating process structure and heating method of steel rolling heating furnace

Technical Field

The invention relates to the technical field of billet heating furnaces, in particular to a combined heating process structure and a heating method of a steel rolling heating furnace.

Background

The existing steel rolling heating process mainly comprises the following steps: 1) And (5) hot feeding and hot charging: the hot-feeding blank from continuous casting is fed into a gas heating furnace through a hot-feeding roller way, heated to tapping temperature in the gas heating furnace, then discharged from the heating furnace and fed into a rolling mill for rolling; 2) And (3) cold packaging: cold blanks from a blank warehouse are hoisted on a furnace feeding device, are fed into a traditional gas heating furnace through a furnace feeding roller way, are heated to the tapping temperature in the traditional gas heating furnace, are discharged from the heating furnace, and are sent to a rolling mill for rolling; 3) And (3) direct rolling: the continuous casting billet is directly sent to a rolling mill for rolling, a bypass direct rolling roller way is arranged at the discharge end of a traditional gas heating furnace, and the billet is directly sent to the rolling mill without passing through the heating furnace; 4) Continuous casting and direct rolling: the production line is not provided with a traditional gas heating furnace, adopts an induction heater or other rapid heating modes to carry out surface heat supplement and then sends the surface heat supplement to a rolling mill for rolling, or directly enters a blooming process without induction heating and then carries out induction heating.

At present, most production factories adopt traditional hot-feeding hot-charging and cold-charging production modes, the hot-feeding proportion of a hot rolling line with better conditions can reach more than 60%, and the hot charging temperature can reach more than 600 ℃; however, most production plants have relatively low heat transfer ratio and heat transfer temperature, and measures are taken to increase the heat transfer ratio and the heat packing temperature, so that the main purpose is energy saving. A few newly-built bar line production lines are provided with a direct rolling roller way on the basis of hot feeding and hot loading and cold loading modes. Part of the continuous casting and rolling production line with short flow adopts a continuous casting and rolling process.

From the aspect of energy utilization, continuous casting and direct rolling are adopted, and the intermediate link of a steel rolling heating furnace is canceled, so that the method is the most efficient energy-saving and consumption-reducing means. However, because of the intermittent production of continuous casting and the continuous production of steel rolling, a certain rhythm matching problem exists; and the problem that the production organization of order type production and mass production is difficult to perfectly match; in addition, the production of a part of steel types has certain special requirements on heating before rolling, and the like, so that a heating device is still needed between continuous casting and rolling mill to realize buffering. Therefore, for most of the existing production lines, the steel rolling heating furnace is temporarily and still not completely replaced.

As is well known, the traditional gas heating furnace is an energy-consuming user in a steel rolling workshop, and is also an important point for environmental protection monitoring because of direct smoke emission in gas heating. In order to achieve the aim of reducing carbon and the requirement of environmental protection, how to reduce the fume emission index and carbon emission of the steel rolling heating furnace is an important direction of steel rolling heating furnace research.

Therefore, the inventor provides a combined heating process structure and a heating method of a steel rolling heating furnace by virtue of experience and practice of related industries for many years, so as to overcome the defects of the prior art.

Disclosure of Invention

The invention aims to provide a combined heating process structure and a heating method of a steel rolling heating furnace, which solve the problems of high energy consumption and high pollutant emission of the steel rolling gas heating furnace.

The invention aims to achieve the purpose that the combined heating process structure of the steel rolling heating furnace comprises at least one gas heating furnace, wherein an inlet or an outlet of the gas heating furnace is provided with an electric induction heating device, the electric induction heating device is used for heating or supplementing heat before rolling of billets, and the axial direction of the electric induction heating device is perpendicular to the axial direction of the gas heating furnace.

In a preferred embodiment of the invention, an inlet of the gas heating furnace is provided with a furnace feeding roller way, an outlet of the gas heating furnace is provided with a furnace discharging roller way, and the workpiece running directions of the furnace feeding roller way and the furnace discharging roller way are perpendicular to the workpiece running direction of the gas heating furnace; the electric induction heating device is arranged on the furnace feeding roller way or the furnace discharging roller way.

In a preferred embodiment of the present invention, the electric induction heating device is disposed on the tapping roller table, and the electric induction heating device is located at one side of the gas heating furnace along the running direction of the workpiece, or at one side of the gas heating furnace opposite to the running direction of the workpiece.

In a preferred embodiment of the invention, a direct rolling engagement roller way is arranged coaxially with the tapping roller way and in the direction opposite to the workpiece running direction of the tapping roller way, and the direct rolling engagement roller way is used for directly conveying continuous casting direct rolling blanks into the electric induction heating device for heat compensation.

In a preferred embodiment of the invention, the electric induction heating device comprises a plurality of gas heating furnaces which are arranged in parallel, wherein inlets of the gas heating furnaces are arranged in a furnace roller way, outlets of the gas heating furnaces are arranged in a furnace discharging roller way, and a plurality of electric induction heating devices are arranged on the furnace discharging roller way in parallel.

In a preferred embodiment of the present invention, each of the electric induction heating devices is located at one side of the gas heating furnace along the workpiece running direction, and a direct rolling engagement roller way is arranged in a direction coaxial with the tapping roller way and opposite to the workpiece running direction of the tapping roller way.

In a preferred embodiment of the invention, the electric induction heating device is located at one side of the gas heating furnace opposite to the running direction of the workpiece, and a direct rolling connection roller way is arranged at one side of the electric induction heating device away from the gas heating furnace.

In a preferred embodiment of the present invention, the gas heating furnace is of a side-in-side-out structure; the side portion of the inlet end of the gas heating furnace is provided with a furnace entering roller way, the side portion of the outlet end of the gas heating furnace is provided with a furnace discharging roller way, the outlet end of the gas heating furnace is further provided with a bypass roller way, the bypass roller way is provided with an electric induction heating device, the direction of the furnace discharging roller way opposite to the running direction of a workpiece is provided with an outlet reverse roller way, a steel moving device is arranged between the outlet reverse roller way and the electric induction heating device, and one side of the steel moving device, which is far away from the electric induction heating device, is provided with a direct rolling connecting roller way.

The invention can also achieve the aim, namely a heating method of a combined heating process structure of a steel rolling heating furnace, which comprises the following steps:

step a, arranging an electric induction heating device on a furnace feeding roller way, feeding a steel billet into the electric induction heating device for heat supplement or heating, and feeding the steel billet into a gas heating furnace through the furnace feeding roller way;

step b, in the gas heating furnace, heating the steel billet to the temperature required by the rolling process;

and c, conveying the heated billet to a rolling mill for rolling through a tapping roller way.

The invention can also achieve the aim, namely a heating method of a combined heating process structure of a steel rolling heating furnace, which comprises the following steps:

step a, an electric induction heating device is positioned at one side of the gas heating furnace along the running direction of a workpiece, and a billet is fed into the gas heating furnace through a furnace feeding roller way;

step b, heating the steel billet to 800-1050 ℃ in a gas heating furnace;

step c, discharging the steel billet into an electric induction heating device on a discharging roller way, and heating the steel billet to 100-200 ℃ to 900-1250 ℃;

and d, conveying the heated billet to a rolling mill for rolling.

The invention can also achieve the aim, namely a heating method of a combined heating process structure of a steel rolling heating furnace, which comprises the following steps: step a, an electric induction heating device is positioned at one side of the gas heating furnace in the direction opposite to the running direction of the workpiece, and a billet is fed into the gas heating furnace through a furnace roller way;

Step b, in the gas heating furnace, heating the steel billet to a set temperature;

step c, discharging the steel billet, reversely entering an electric induction heating device, and heating to the temperature required by the process;

and d, conveying the billet from the electric induction heating device to a rolling mill along the set running direction of the workpiece for rolling.

The invention can also achieve the aim, namely a heating method of a combined heating process structure of a steel rolling heating furnace, which comprises the following steps: the electric induction heating device is positioned at one side of the gas heating furnace along the running direction of the workpiece, and a billet is fed into the gas heating furnace through a furnace feeding roller way; directly conveying the continuous casting straight rolled blank into an electric induction heating device for heat compensation through a direct rolling connection roller way, and heating to the rolling process temperature; and after heating, the billet is sent to a rolling mill for rolling.

The invention can also achieve the aim, namely a heating method of a combined heating process structure of a steel rolling heating furnace, which comprises the following steps:

step a, a billet is sent into a gas heating furnace through a furnace feeding roller way;

step b, in the gas heating furnace, heating the steel billet to a set temperature;

step c, discharging the steel billet, reversely conveying the steel billet, and feeding the steel billet into an electric induction heating device on a bypass roller way through a steel moving device to heat the steel billet to the temperature required by the process;

And d, outputting the billet from the electric induction heating device, merging the billet into a tapping roller way, and conveying the billet to a rolling mill along the running direction of a workpiece for rolling.

Therefore, the combined heating process structure and the heating method of the steel rolling heating furnace have the following beneficial effects:

the invention adopts a combined heating process, namely a combined heating process of gas heating and electric induction heating, solves the problems of high energy consumption and high pollutant emission of a steel rolling gas heating furnace, and realizes the purposes of greatly reducing emission and applying green electricity technology; an electric induction heating device can be arranged behind the gas heating furnace, and an electric induction heating device can be arranged in front of the gas heating furnace; the advantages of the two heating modes are combined, and the heating device can be used for heating or supplementing heat before rolling of billets, and aims to replace a part of heating functions of a gas heating furnace by electric induction heating and reduce the smoke emission of the gas heating furnace; the invention can adapt to the arrangement requirements of various processes, and is suitable for the transformation of the old production line and the process requirements of the newly-built production line.

(1) The load of the gas heating furnace is reduced, the smoke emission of the gas heating furnace can be directly and greatly reduced, and the environment-friendly requirement is met;

(2) The fuel gas consumption of the fuel gas heating furnace is greatly reduced; moreover, as the electric induction heating efficiency is high, energy conservation and consumption reduction to a certain extent can be realized; the electric induction heating device is started and stopped rapidly, and the energy consumption of the working procedure is greatly reduced; if a green electricity technology is adopted, the carbon reduction and carbon reduction can be realized greatly;

(3) The production buffer function of the gas heating furnace is reserved, the problem of rhythm matching between continuous casting and steel rolling can be solved, and the production organization mode of the existing steel rolling workshop can not be changed basically;

(4) The electromagnetic induction device is flexible and small, can be flexibly arranged and adopted according to the existing production line, is beneficial to rapid transformation application, and promotes the application of the green electricity technology in a steel rolling workshop;

(5) The electric induction heating part is adopted to replace gas heating, and electric induction equipment with relatively smaller electric power can be adopted, so that the problem of adopting ultra-high power consumption equipment at one time caused by complete replacement is avoided;

(6) The heating quality of the product is improved, the oxidation burning loss and the decarburization are reduced, and particularly, the combined heating process of arranging the electric induction heating device behind the gas heating furnace is adopted, so that the oxidation burning loss and the decarburization can be greatly reduced, and the temperature uniformity is improved.

Drawings

The following drawings are only for purposes of illustration and explanation of the present invention and are not intended to limit the scope of the invention.

Wherein:

fig. 1: a schematic diagram of an embodiment one of a combined heating process structure of a steel rolling heating furnace of the invention is shown.

Fig. 2: a schematic diagram of a second embodiment of the combined heating process structure of the steel rolling heating furnace is shown.

Fig. 3: a third embodiment of the combined heating process structure of the steel rolling heating furnace is schematically shown.

Fig. 4: a schematic diagram of a fourth embodiment of the combined heating process structure of the steel rolling heating furnace is shown.

Fig. 5: a fifth embodiment of the combined heating process structure of the steel rolling heating furnace is schematically shown.

Fig. 6: a schematic diagram of a sixth embodiment of the combined heating process structure of the steel rolling heating furnace of the invention.

Fig. 7: a schematic diagram of a seventh embodiment of the combined heating process structure of the steel rolling heating furnace of the present invention.

Fig. 8: a schematic diagram of an embodiment eight of the combined heating process structure of the steel rolling heating furnace of the invention.

Fig. 9: a schematic diagram of a ninth embodiment of the combined heating process structure of the steel rolling heating furnace of the present invention.

Fig. 10: a schematic diagram of an embodiment ten of a combined heating process structure of a steel rolling heating furnace of the invention.

In the figure:

1. a gas heating furnace; 2. an electric induction heating device; 3. a furnace roller way is arranged; 4. discharging the roller way; 5. directly rolling the connecting roller way; 6. a steel loading machine; 7. a tapping machine; 8. the slab warehouse is connected with a roller way; 9. a bypass roller way; 10. an outlet reverse roller way; 11. and a steel moving device.

Detailed Description

For a clearer understanding of technical features, objects, and effects of the present invention, a specific embodiment of the present invention will be described with reference to the accompanying drawings.

The specific embodiments of the invention described herein are for purposes of illustration only and are not to be construed as limiting the invention in any way. Given the teachings of the present invention, one of ordinary skill in the related art will contemplate any possible modification based on the present invention, and such should be considered to be within the scope of the present invention. It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "mounted," "connected," "coupled," and "connected" are to be construed broadly, and may be, for example, mechanically or electrically connected, may be in communication with each other in two elements, may be directly connected, or may be indirectly connected through an intermediary, and the specific meaning of the terms may be understood by those of ordinary skill in the art in view of the specific circumstances. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1 to 10, the invention provides a combined heating process structure of a steel rolling heating furnace, which comprises at least one gas heating furnace 1, wherein an electric induction heating device 2 is arranged at an inlet or an outlet of the gas heating furnace 1, the electric induction heating device 2 is used for heating or supplementing heat before rolling a billet, and the axial direction of the electric induction heating device 2 is perpendicular to the axial direction of the gas heating furnace 1.

The invention adopts a combined heating process, namely a combined heating process of gas heating and electric induction heating, so as to realize the purposes of greatly reducing emission and applying green electricity technology. The electric induction heating device can be arranged behind the gas heating furnace, and the electric induction heating device can also be arranged in front of the gas heating furnace. The advantages of the two heating modes are combined, the heating device can be used for heating or supplementing heat before rolling of billets, and the purpose is to replace a part of heating functions of a gas heating furnace by electric induction heating, so that the gas discharge of the gas heating furnace is reduced.

The benefits of this are mainly the following:

(1) The load of the gas heating furnace is reduced, the smoke emission of the gas heating furnace can be directly and greatly reduced, and the environment-friendly requirement is met;

(2) The fuel gas consumption of the fuel gas heating furnace is greatly reduced; moreover, as the electric induction heating efficiency is high, energy conservation and consumption reduction to a certain extent can be realized; the electric induction heating device is started and stopped rapidly, and the energy consumption of the working procedure is greatly reduced; if a green electricity technology is adopted, the carbon reduction and carbon reduction can be realized greatly;

(3) The production buffer function of the gas heating furnace is reserved, the problem of rhythm matching between continuous casting and steel rolling can be solved, and the production organization mode of the existing steel rolling workshop can not be changed basically;

(4) The electromagnetic induction device is flexible and small, can be flexibly arranged and adopted according to the existing production line, is beneficial to rapid transformation application, and promotes the application of the green electricity technology in a steel rolling workshop;

(5) The electric induction heating part is adopted to replace gas heating, and electric induction equipment with relatively smaller electric power can be adopted, so that the problem of adopting ultra-high power consumption equipment at one time caused by complete replacement is avoided;

(6) The heating quality of the product is improved, the oxidation burning loss and the decarburization are reduced, and particularly, the combined heating process of arranging the electric induction heating device behind the gas heating furnace is adopted, so that the oxidation burning loss and the decarburization can be greatly reduced, and the temperature uniformity is improved.

Further, an inlet of the gas heating furnace 1 is arranged on a furnace feeding roller way 3, an outlet of the gas heating furnace 1 is provided with a furnace discharging roller way 4, and the workpiece running directions of the furnace feeding roller way 3 and the furnace discharging roller way 4 are perpendicular to the workpiece running direction of the gas heating furnace; an electric induction heating device 2 is arranged on the furnace inlet roller way 3 or the furnace outlet roller way 4.

Further, an electric induction heating device 2 is arranged on the tapping roller table 4, and the electric induction heating device 2 is positioned on one side of the gas heating furnace 1 along the running direction of the workpiece, or the electric induction heating device 2 is positioned on one side of the gas heating furnace 1 along the direction opposite to the running direction of the workpiece.

Further, a direct rolling engagement roller way 5 is arranged coaxially with the tapping roller way 4 and along the direction opposite to the workpiece running direction of the tapping roller way, and the direct rolling engagement roller way 5 is used for directly conveying continuous casting direct rolling blanks into the electric induction heating device 2 for heat compensation.

The invention adopts a combined heating process and adopts a combined heating process of gas heating and electric induction heating. The invention can adopt two kinds of combination modes: 1) An electric induction heating device is arranged behind the gas heating furnace; 2) An electric induction heating device is arranged in front of the gas heating furnace.

The combined heating process of arranging the electric induction heating device behind the gas heating furnace mainly comprises the following key points:

(1) The combined heating process of the electric induction heating device is arranged behind the gas heating furnace: after the billet is heated to 800-1050 ℃ in a gas heating furnace, discharging, entering an induction heating device, rapidly heating to 100-200 ℃ to a rolling temperature of 900-1250 ℃, and then conveying to a rolling mill for rolling; the specific temperature ranges of the gas heating furnace and the electric induction heating are not limited to the parameters, and are determined according to the steel grade, the steel billet outline dimension, the configuration capacity and the like, so that the purpose of reducing the furnace temperature, the gas consumption and the smoke emission of the gas heating furnace is realized, and the reduction of the total energy consumption is ensured;

(2) The combined heating process of the electric induction heating device is arranged behind the gas heating furnace: the gas heating furnace can adopt a low-temperature walking beam type heating furnace, an all-metal beam walking beam type heating furnace, or a walking bottom type heating furnace, a beam bottom combined type heating furnace, a push steel type heating furnace and the like which have low requirements on heating temperature uniformity; the furnace lining of the gas heating furnace can be a light furnace lining; heating all side burners, and controlling the pulse; the water cooling loss is greatly reduced; the temperature is quickly increased and reduced;

(3) The combined heating process of the electric induction heating device is arranged behind the gas heating furnace: wherein, the electric induction heating device can adopt a way of arranging a plurality of coil module groups among roller ways; the coil module group can adopt a movable structure so as to adapt to the heating of multiple specifications of billets and multiple process systems; the coil module group can be quickly replaced by parallel movement of a plurality of groups of equipment, and can be quickly replaced and disassembled by a single group of coils; the electric induction heating device can adopt sectional frequency division control, so that the effects of low-frequency rapid heating at an inlet section, balanced heating at an intermediate section and high-frequency soaking at an outlet section are met; a single heating module can be adopted according to the specification of the steel billet; the electric induction heating device is designed according to the rhythm of the production line, so that enough time is ensured to realize the temperature uniformity of billet heating;

(4) The combined heating process of the electric induction heating device is arranged behind the gas heating furnace: the electric induction heating device can be used by adopting a plurality of electric induction heating devices in parallel, and can be used for coping with off-line induction heating of mass production, so that the production rhythm of the electric induction heating device, a gas heating furnace and a rolling mill is matched; the device can also be used for meeting the production requirements of billets with multiple specifications, namely, different induction coils are adopted for different billet specifications, and the integral quick replacement can be realized. The whole moving mode is adopted among the multiple sets of equipment, and the single-set equipment has enough length to rapidly heat the steel billet;

(5) The combined heating process of the electric induction heating device is arranged behind the gas heating furnace: the electric induction heating device can be arranged at the forward outlet position of the gas heating furnace, the reverse outlet position of the gas heating furnace and the bypass roller way at the outlet end of the gas heating furnace in various arrangement modes in the scheme;

(6) The combined heating process of the electric induction heating device is arranged behind the gas heating furnace: the multi-type arrangement mode in the scheme can be adopted, namely, a combination of one electric induction heating device is configured for one gas heating furnace, a combination of one electric induction heating device is configured for a plurality of gas heating furnaces, a combination of a plurality of electric induction heating devices is configured for one gas heating furnace, and a combination of a plurality of electric induction heating devices is configured for a plurality of gas heating furnaces;

(7) The combined heating process of the electric induction heating device is arranged behind the gas heating furnace: the arrangement form can be conveniently connected with the straight roller way, and the continuous casting straight rolled blank can be directly conveyed to the electric induction heating device for temperature compensation and heating and then conveyed to the rolling mill for rolling.

The combined heating process of arranging the electric induction heating device in front of the gas heating furnace mainly comprises the following key points:

(1) The combined heating process of the electric induction heating device is arranged in front of the gas heating furnace: the steel billet which is sent by continuous casting and hot delivery passes through a steel billet warehouse connecting roller way and enters an induction heating device for heat compensation, or the steel billet is heated to 100-200 ℃, and then enters a gas heating furnace for heating to the temperature required by the rolling process. The specific temperature ranges of the gas heating furnace and the electric induction heating are determined according to the steel grade, the steel billet outline dimension, the configuration capacity and the like, so that the purpose of reducing the gas consumption and the smoke emission of the gas heating furnace is realized, and the reduction of the total energy consumption is ensured;

(2) The combined heating process of the electric induction heating device is arranged in front of the gas heating furnace: if cold-packed billets are received from the billet warehouse, the billets are heated to 100-300 ℃ after passing through an induction heating device, and then are heated to the temperature required by the rolling process in a gas heating furnace. The specific temperature ranges of the gas heating furnace and the electric induction heating are determined according to the steel grade, the steel billet outline dimension, the configuration capacity and the like, so that the purpose of reducing the gas consumption and the smoke emission of the gas heating furnace is realized, and the reduction of the total energy consumption is ensured;

(3) The combined heating process of the electric induction heating device is arranged in front of the gas heating furnace: wherein the electric induction heating device can adopt a mode that a plurality of coil module groups are arranged between roller tables; the coil module group can adopt a movable structure so as to adapt to the heating of multiple specifications of billets and multiple process systems; the coil module group can be quickly replaced by parallel movement of a plurality of groups of equipment, and can be quickly replaced and disassembled by a single group of coils; the electric induction heating device can adopt sectional frequency division control, so that the effects of low-frequency rapid heating at an inlet section, balanced heating at an intermediate section and high-frequency soaking at an outlet section are met; a single heating module can be adopted according to the specification of the steel billet; the electric induction heating device is designed according to the rhythm of the production line, so that enough time is ensured to realize the temperature uniformity of billet heating;

(4) The combined heating process of the electric induction heating device is arranged in front of the gas heating furnace: wherein the gas heating furnace can adopt a walking beam type heating furnace, a steel pushing type heating furnace and the like; the heat accumulating type heating mode can be adopted to cope with the working condition of higher billet charging temperature and ensure the low enough exhaust gas temperature; the conventional heating furnace can be adopted, and a high-efficiency waste heat recovery device is configured for recovering the waste heat of high-temperature smoke exhaust;

(5) The combined heating process of the electric induction heating device is arranged in front of the gas heating furnace: the electric induction heating device can be used by adopting a plurality of electric induction heating devices in parallel, and can be used for coping with off-line induction heating of mass production, so that the production rhythm of the electric induction heating device, a gas heating furnace and a rolling mill is matched; the device can also be used for meeting the production requirements of billets with multiple specifications, namely, different induction coils are adopted for different billet specifications, and the integral quick replacement can be realized. The whole moving mode is adopted among the multiple sets of equipment, and the single-set equipment has enough length to rapidly heat the steel billet;

(6) The combined heating process of the electric induction heating device is arranged in front of the gas heating furnace: the multi-type arrangement mode in the scheme can be adopted, namely, a combination of one electric induction heating device is configured for one gas heating furnace, a combination of one electric induction heating device is configured for a plurality of gas heating furnaces, a combination of a plurality of electric induction heating devices is configured for one gas heating furnace, and a combination of a plurality of electric induction heating devices is configured for a plurality of gas heating furnaces;

(7) The combined heating process of the electric induction heating device is arranged in front of the gas heating furnace: the arrangement form can be conveniently connected with a continuous casting hot-feeding roller way, and can be used for improving the heat supplement and temperature rise of a continuous casting hot-feeding billet.

When the combined heating process is adopted to cope with the engineering project of modification, the gas heating furnace can also be utilized to old or partially modify the existing traditional gas heating furnace.

When the combined heating process is adopted, the arrangement mode of the electric induction heating device and the gas heating furnace can be similar to the arrangement mode of fig. 1-10, and the arrangement mode is not limited to the above mode, and the arrangement mode of heating by combining gas heating and electric induction heating is within the protection scope of the patent of the invention.

Example 1

As shown in fig. 1, the combined heating process structure of the steel rolling heating furnace adopts a combined mode that an electric induction heating device 2 is arranged behind a gas heating furnace 1 with an end inlet and an end outlet, namely, the combined heating process structure comprises the gas heating furnace 1, the gas heating furnace 1 is of an end inlet and end outlet structure, an inlet end of the gas heating furnace 1 is arranged in a furnace roller way 3, an outlet end of the gas heating furnace 1 is provided with a furnace outlet roller way 4, one side of the furnace inlet roller way 3 far away from the gas heating furnace 1 is provided with a steel loading machine 6, one side of the furnace outlet roller way 4 far away from the gas heating furnace 1 is provided with a steel tapping machine 7, and both the steel loading machine 6 and the steel tapping machine 7 are coaxially arranged with the gas heating furnace 1; the workpiece running directions of the furnace feeding roller way 3 and the furnace discharging roller way 4 are perpendicular to the workpiece running direction of the gas heating furnace; an electric induction heating device 2 is arranged on the tapping roller way 4, and the electric induction heating device 2 is positioned on one side of the gas heating furnace 1 along the running direction of the workpiece.

Specifically, the furnace roller way 3 is connected with a billet warehouse roller way (the prior art); the device can also be directly connected with a continuous casting hot-feeding roller way (the prior art); besides satisfying the requirement of conveying hot blanks, the furnace roller way 3 can be provided with a cold blank feeding device in the blank warehouse for receiving and feeding cold blanks.

And a steel loading machine 6 for loading the steel billet into the gas heating furnace 1.

The gas heating furnace 1 is a continuous heating furnace, and can be a low-temperature walking beam type heating furnace, a metal beam walking beam type heating furnace, or a walking bottom type heating furnace, a beam bottom combined type heating furnace, a steel pushing type heating furnace and the like which have low requirements on heating temperature uniformity; as the highest furnace temperature can be reduced to about 1000 ℃, the furnace lining of the gas heating furnace can be a light furnace lining; all side burners are heated, pulse control is carried out, and equipment pipelines are simply arranged; a plurality of water-cooling structural members can be omitted, so that water-cooling loss is greatly reduced; the temperature rise and the temperature reduction are rapid, and the process energy consumption is small. The gas heating furnace heats the steel billet to the temperature required by the combined heating process.

And the tapping machine 7 is used for conveying the billet heated in the gas heating furnace 1 to the tapping roller way 4.

The electric induction heating device 2 can adopt a mode that a plurality of coil module groups are arranged between roller tables; the coil module group can adopt a movable structure so as to adapt to the heating of multiple specifications of billets and multiple process systems; the coil module group can be quickly replaced by parallel movement of a plurality of groups of equipment, and can be quickly replaced and disassembled by a single group of coils; the electric induction heating device 2 can adopt sectional frequency division control to meet the effects of low-frequency rapid heating at an inlet section, balanced heating at an intermediate section and high-frequency soaking at an outlet section; a single heating module can be adopted according to the specification of the steel billet; the electric induction heating device 2 is designed according to the production line rhythm, so that enough time is ensured to realize the temperature uniformity of billet heating.

And a tapping roller way 4 for feeding the billet from the gas heating furnace 1 into the electric induction heating device 2 and feeding the heated billet into the rolling mill.

The heating method of this embodiment is as follows: the method comprises the following steps:

step a, steel billets are conveyed into a gas heating furnace 1 through a billet warehouse connecting roller way and a furnace feeding roller way 3;

step b, in the gas heating furnace 1, heating the steel billet to 800-1050 ℃;

step c, discharging the steel billet into an electric induction heating device 2 on a discharging roller way, and rapidly heating the steel billet to a rolling temperature of 900-1250 ℃ at 100-200 ℃;

and d, conveying the heated billet to a rolling mill for rolling.

The specific temperature ranges of the gas heating furnace 1 and the electric induction heating device 2 are not limited to the parameters, and are determined according to the steel grade, the steel billet outline dimension, the configuration capacity and the like, so that the purpose of reducing the furnace temperature, the gas consumption and the smoke emission of the gas heating furnace is to reduce the total energy consumption.

In the combined heating process, the method has the following characteristics and advantages:

(1) The steel tapping temperature of the steel billet in the gas heating furnace is much lower than that of the traditional gas heating furnace, so that the gas heating furnace adopted by the invention can adopt a lower furnace temperature system; after the low-temperature steel burning process in the gas flame heating process is realized, the indexes such as oxidation burning loss, decarburization and the like in the gas heating furnace can be controlled very low; in the electric induction heating process, the oxidation burning loss is almost negligible due to the high heating speed and short time. Compared with the traditional heating furnace, the total oxidation burning loss can be reduced by 50-80%;

(2) The working furnace temperature of the gas heating furnace adopted by the invention is greatly reduced, and the gas heating furnace can adopt various energy-saving and simple and efficient control measures which can be adopted on a plurality of heat treatment furnaces such as a light furnace lining, full pulse control, a water-free chilled beam and the like; the gas heating furnace and the electromagnetic induction heating device of the light furnace lining can be quickly heated and cooled, and the working procedure energy consumption is very low. Compared with the traditional gas heating furnace, the total energy consumption can be reduced by 5 to 10 percent;

(3) The final tapping temperature uniformity can be finished by an electric induction heating device with higher heating efficiency, and the gas heating furnace can be used for heating a billet without strict temperature uniformity index requirements on heating the billet, so that a plurality of furnace types with relatively low manufacturing cost can be adopted for finishing heating;

(4) Compared with the traditional gas heating furnace, the combined mode has the advantages that partial gas heating is replaced by electric induction heating, and the direct smoke emission can be reduced by 10-20%; if the green electricity technology is considered, the total carbon emission can be reduced by about 15 to 30 percent.

Example two

As shown in fig. 2, the combined heating process structure of the steel rolling heating furnace adopts a combined mode that an electric induction heating device 2 is arranged in front of a gas heating furnace 1 with an end inlet and an end outlet, namely, the combined heating process structure comprises the gas heating furnace 1, the gas heating furnace 1 is of an end inlet and end outlet structure, an inlet end of the gas heating furnace 1 is arranged in a furnace roller way 3, an outlet end of the gas heating furnace 1 is provided with a furnace outlet roller way 4, a steel loading machine 6 is arranged on one side, far away from the gas heating furnace 1, of the furnace inlet roller way 3, a steel tapping machine 7 is arranged on one side, far away from the gas heating furnace 1, of the furnace outlet roller way 4, and both the steel loading machine 6 and the steel tapping machine 7 are coaxially arranged with the gas heating furnace 1; the workpiece running directions of the furnace feeding roller way 3 and the furnace discharging roller way 4 are perpendicular to the workpiece running direction of the gas heating furnace; an electric induction heating device 2 is arranged on the furnace roller way 3.

Specifically, a slab warehouse connecting roller way 8 is arranged on one side of the electric induction heating device 2 far away from the gas heating furnace 1, and can be directly in butt joint with a continuous casting hot conveying roller way; the roller way not only meets the requirement of conveying hot blanks, but also is provided with a cold blank feeding device in the blank warehouse for conveying cold blanks for feeding;

the electric induction heating device 2 can adopt a mode that a plurality of coil module groups are arranged between roller tables; the coil module group can adopt a movable structure so as to adapt to the heating of multiple specifications of billets and multiple process systems; the coil module group can be quickly replaced by parallel movement of a plurality of groups of equipment, and can be quickly replaced and disassembled by a single group of coils; the electric induction heating device 2 can adopt sectional frequency division control to meet the effects of low-frequency rapid heating at an inlet section, balanced heating at an intermediate section and high-frequency soaking at an outlet section; a single heating module can be adopted according to the specification of the steel billet; the electric induction heating device 2 is designed according to the production line rhythm, so that enough time is ensured to realize the temperature uniformity of billet heating.

The steel loading machine 6 is used for loading steel billets into a gas heating furnace.

The furnace roller way 3 is connected with the electric induction heating device 2; the steel billet after electric induction heating is conveyed to the front of a gas heating furnace;

the gas heating furnace 1 is a continuous heating furnace; a walking beam type heating furnace, a steel pushing type heating furnace and the like can be adopted; the heat accumulating type heating mode can be adopted to cope with the working condition of higher billet charging temperature and ensure the low enough exhaust gas temperature; the heating furnace with conventional heating can be also adopted, and a high-efficiency waste heat recovery device is configured for recovering the waste heat of high-temperature smoke exhaust; the gas heating furnace 1 heats the billet to the temperature required by the steel rolling process and then discharges the billet.

The tapping roller table 4 is used for feeding the billet heated by the gas heating furnace 1 to a rolling mill.

The heating method of this embodiment is as follows: the method comprises the following steps:

step a, a steel billet which is continuously cast and hot-fed is conveyed into an electric induction heating device 2 to supplement heat through a steel billet warehouse connecting roller way, or the steel billet can be heated to 100-200 ℃ and conveyed into a gas heating furnace 1 through a furnace feeding roller way 3; the specific temperature range of the induction heating is determined according to the steel grade, the steel billet external dimension, the configuration capacity and the like;

if cold-charged billets are received from the billet warehouse, heating the billets to 100-300 ℃ after passing through the electric induction heating device 2; the specific temperature range of the induction heating is determined according to the steel grade, the steel billet external dimension, the configuration capacity and the like;

step b, in the gas heating furnace, heating the steel billet to the temperature required by the rolling process;

and c, conveying the heated billet to a rolling mill for rolling through a tapping roller way.

The combination mode can also be used for the temperature compensation heating of continuous casting hot blank feeding only. The method can greatly improve the billet feeding temperature of the gas heating furnace and reduce the energy consumption of the gas heating furnace. The gas heating furnace is suitable for adopting a regenerative heating mode to ensure a low enough exhaust gas temperature. In the heating combination process, when the incoming material is a cold blank, the whole electric induction heating device can be quickly moved out of the roller way area.

When the combined heating process is used for new projects, the furnace length of the heating furnace can be reduced; the method can be used for improving the yield when being used for engineering reconstruction.

Example III

As shown in fig. 3, the combined heating scheme of the electric induction heating device 2 is arranged behind the side-in side-out gas heating furnace 1 adopted by the combined heating process structure of the steel rolling heating furnace, namely the combined heating scheme comprises the gas heating furnace 1, wherein the gas heating furnace 1 is of a side-in side-out structure, the side part of one inlet end of the gas heating furnace 1 is arranged in a furnace roller way 3, the side part of one outlet end of the gas heating furnace 1 is provided with a furnace outlet roller way 4, and the workpiece running directions of the furnace inlet roller way 3 and the furnace outlet roller way 4 are perpendicular to the workpiece running direction of the gas heating furnace; an electric induction heating device 2 is arranged on the tapping roller way 4, and the electric induction heating device 2 is positioned on one side of the gas heating furnace 1 along the running direction of the workpiece.

The heating method of this embodiment is as follows: the method comprises the following steps:

step a, steel billets are conveyed into a gas heating furnace 1 through a billet warehouse connecting roller way and a furnace feeding roller way 3;

step b, in the gas heating furnace 1, heating the steel billet to 800-1050 ℃;

step c, discharging the steel billet into an electric induction heating device 2 on a discharging roller way, and rapidly heating the steel billet to a rolling temperature of 900-1250 ℃ at 100-200 ℃;

And d, conveying the heated billet to a rolling mill for rolling.

The specific temperature ranges of the gas heating furnace 1 and the electric induction heating device 2 are not limited to the parameters, and are determined according to the steel grade, the steel billet outline dimension, the configuration capacity and the like, so that the purpose of reducing the furnace temperature, the gas consumption and the smoke emission of the gas heating furnace 1 is to reduce the total energy consumption. For example: the method can be used for heating certain special steel types, and the billet can be heated to about 900 ℃ in a gas heating furnace and then enters an induction heating device to be heated to about 1050 ℃ so as to realize the production process of extremely low oxidation burning loss and even zero decarburization.

Example IV

As shown in fig. 4, the combined heating scheme of the electric induction heating device 2 is arranged in front of the side-in side-out gas heating furnace 1 adopted by the combined heating process structure of the steel rolling heating furnace, namely the combined heating scheme comprises the gas heating furnace 1, wherein the gas heating furnace 1 is of the side-in side-out structure, the side part of one inlet end of the gas heating furnace 1 is arranged in a furnace roller way 3, the side part of one outlet end of the gas heating furnace 1 is provided with a furnace outlet roller way 4, and the workpiece running directions of the furnace inlet roller way 3 and the furnace outlet roller way 4 are perpendicular to the workpiece running direction of the gas heating furnace; an electric induction heating device 2 is arranged on the furnace roller way 3.

Specifically, a slab warehouse connecting roller way 8 is arranged on one side of the electric induction heating device 2 far away from the gas heating furnace 1, and can be directly in butt joint with a continuous casting hot conveying roller way; besides meeting the requirement of conveying hot blanks, the roller way is also provided with a cold blank feeding device in the blank warehouse for conveying cold blanks for feeding.

The heating method of this embodiment is as follows: the method comprises the following steps:

step a, a steel billet which is continuously cast and hot-fed is conveyed into an electric induction heating device 2 to supplement heat through a steel billet warehouse connecting roller way, or the steel billet can be heated to 100-200 ℃ and conveyed into a gas heating furnace 1 through a furnace feeding roller way 3; the specific temperature range of the induction heating is determined according to the steel grade, the steel billet external dimension, the configuration capacity and the like;

if cold-charged billets are received from the billet warehouse, heating the billets to 100-300 ℃ after passing through the electric induction heating device 2; the specific temperature range of the induction heating is determined according to the steel grade, the steel billet external dimension, the configuration capacity and the like;

step b, in the gas heating furnace, heating the steel billet to the temperature required by the rolling process;

and c, conveying the heated billet to a rolling mill for rolling through a tapping roller way.

The specific temperature ranges of the gas heating furnace 1 and the electric induction heating device 2 are not limited to the parameters, and are determined according to the steel grade, the steel billet outline dimension, the configuration capacity and the like, so that the purpose of reducing the gas consumption and the smoke emission of the gas heating furnace is realized, and the reduction of the total energy consumption is ensured.

The combination mode can also be used for the temperature compensation heating of continuous casting hot blank feeding only. In the heating combination process, when the incoming material is a cold blank, the whole electric induction heating device can be quickly moved out of the roller way area. The method can greatly improve the billet feeding temperature of the gas heating furnace and reduce the energy consumption of the gas heating furnace. The gas heating furnace is suitable for adopting a regenerative heating mode to ensure a low enough exhaust gas temperature.

Also, when the combined heating process is used for new projects, the furnace length of the heating furnace can be reduced; the method can be used for improving the yield when being used for engineering reconstruction.

Example five

As shown in fig. 5, on the basis of the first embodiment, a direct rolling engagement roller way 5 is provided coaxially with the tapping roller way 4 and in a direction opposite to the workpiece running direction of the tapping roller way 4, and the embodiment can be used for production of a direct rolling heat supplementing process of a production line with a direct rolling function. The continuous casting straight rolling billet is directly conveyed into the electric induction heating device 2 for heat compensation through the direct rolling connection roller way 5, and is conveyed to a rolling mill for rolling after being heated to the rolling process temperature.

Example six

As shown in fig. 6, on the basis of the third embodiment, a direct rolling engagement roller way 5 is provided coaxially with the tapping roller way 4 and in a direction opposite to the workpiece running direction of the tapping roller way 4, and the embodiment can be used for production of a direct rolling heat supplementing process of a production line with a direct rolling function. The continuous casting straight rolled billet is conveyed into an electric induction heating device 2 for heat compensation through a direct rolling connection roller way 5 and a furnace outlet roller way 4 of a gas heating furnace 1, and is conveyed to a rolling mill for rolling after being heated to the rolling process temperature.

Similarly, under the condition that the process space arrangement is allowed, the direct rolling connection roller way 5 can also adopt a bypass roller way at the discharge end of the gas heating furnace, is integrated into the discharge roller way after passing through the discharge end of the heating furnace, then enters an electric induction heating device for heat compensation, and is sent to a rolling mill for rolling after being heated to the rolling process temperature.

The technical solutions provided in the above solutions include a solution of an end-in-end-out and a side-in-side-out, and can be extended to a solution … … of an end-in-side-out and a side-in-end-out.

The technical scheme provided in the scheme comprises a technical scheme that one fuel gas heating furnace 1 corresponds to one electric induction heating device 2, and the technical scheme can be also expanded to a combined heating process of two fuel gas heating furnaces 1, three fuel gas heating furnaces 1 or a plurality of fuel gas heating furnaces 1 which are in parallel and correspond to one electric induction heating device 2; the method can also be expanded to a combined heating process of one gas heating furnace 1, two gas heating furnaces 1 or a plurality of gas heating furnaces 1 corresponding to two or more electric induction heating devices 2.

Example seven

As shown in fig. 7, the steel rolling heating furnace combined heating process structure adopts a heating mode that a plurality of electric induction heating devices 2 are used in parallel, the steel rolling heating furnace combined heating process structure comprises a plurality of gas heating furnaces 1 which are arranged in parallel, an inlet of each gas heating furnace 1 is provided with a furnace roller way 3, an outlet of each gas heating furnace 1 is provided with a furnace discharging roller way 4, and a plurality of electric induction heating devices 2 are arranged on the furnace discharging roller ways 4 in parallel. Each electric induction heating device 2 is positioned at one side of the gas heating furnace 1 along the running direction of the workpiece, and a direct rolling connection roller way 5 is arranged in the direction which is coaxial with the discharging roller way 4 and opposite to the running direction of the workpiece along the discharging roller way. The gas heating furnace 1 can adopt a structure form of end inlet and end outlet, side inlet and side outlet, end inlet and side outlet and side inlet and end outlet.

The electric induction heating device 2 can be used by adopting a plurality of electric induction heating devices in parallel, and can be used for coping with off-line induction heating of mass production, so that the production rhythm of the electric induction heating device, a gas heating furnace and a rolling mill is matched; the device can also be used for meeting the production requirements of billets with multiple specifications, namely, different induction coils are adopted for different billet specifications, and the integral quick replacement can be realized. The whole moving mode is adopted among the multiple sets of equipment, and the single-set equipment has enough length to rapidly heat the steel billet. The whole moving mode is adopted among the multiple sets of equipment, and the single-set equipment has enough length to rapidly heat the steel billet.

Example eight

As shown in fig. 8, the steel rolling heating furnace combined heating process structure adopts a heating mode that a plurality of electric induction heating devices 2 are used in parallel, the steel rolling heating furnace combined heating process structure comprises a plurality of gas heating furnaces 1 which are arranged in parallel, an inlet of each gas heating furnace 1 is provided with a furnace roller way 3, an outlet of each gas heating furnace 1 is provided with a furnace discharging roller way 4, and a plurality of electric induction heating devices 2 are arranged on the furnace discharging roller ways 4 in parallel. For some occasions with limited space arrangement, the electric induction heating device 2 can be positioned at one side of the gas heating furnace 1 in the direction opposite to the running direction of the workpiece, and a direct rolling connection roller way 5 is arranged at one side of the electric induction heating device 2 away from the gas heating furnace. The gas heating furnace 1 can adopt a structure form of end inlet and end outlet, side inlet and side outlet, end inlet and side outlet and side inlet and end outlet.

After the billet is heated to a certain temperature by the gas heating furnace 1, the billet is conveyed into the electric induction heating device 2 in a reverse direction (rightward in fig. 8) after being discharged, is quickly heated to a temperature required by a process, and is then conveyed to a rolling mill in the reverse direction (leftward in fig. 8) for rolling.

Likewise, the electric induction heating device 2 can be used by adopting a plurality of electric induction heating devices in parallel, and can be used for coping with off-line induction heating of mass production, so that the production rhythm of the electric induction heating device is matched with that of a gas heating furnace and a rolling mill; the device can also be used for meeting the production requirements of billets with multiple specifications, namely, different induction coils are adopted for different billet specifications, and the integral quick replacement can be realized. The whole moving mode is adopted among the multiple sets of equipment, and the single-set equipment has enough length to rapidly heat the steel billet. The arrangement mode can be used for reforming the existing rolling line. Likewise, the arrangement mode can also be connected with a straight roller way, thereby meeting the process requirement of adopting an electric induction heating device for direct rolling and heat compensation.

Example nine

As shown in fig. 9, the combined heating scheme of the electric induction heating device 2 is arranged behind the side-in side-out gas heating furnace 1 adopted by the combined heating process structure of the steel rolling heating furnace, namely the combined heating scheme comprises the gas heating furnace 1, wherein the gas heating furnace 1 is of a side-in side-out structure, the side part of one inlet end of the gas heating furnace 1 is arranged in a furnace roller way 3, the side part of one outlet end of the gas heating furnace 1 is provided with a furnace outlet roller way 4, and the workpiece running directions of the furnace inlet roller way 3 and the furnace outlet roller way 4 are perpendicular to the workpiece running direction of the gas heating furnace; an electric induction heating device 2 is arranged on the tapping roller way 4, and the electric induction heating device 2 is positioned at one side of the gas heating furnace 1 in the direction opposite to the running direction of the workpiece. The side of the electric induction heating device 2 far away from the gas heating furnace 1 is provided with a direct rolling connection roller way 5 or a return roller way.

The heating method of this embodiment is as follows: the method comprises the following steps:

step a, an electric induction heating device 2 is positioned at one side of the gas heating furnace 1 in the direction opposite to the running direction of a workpiece, and a billet is fed into the gas heating furnace 1 through a furnace feeding roller way 3;

step b, in the gas heating furnace 1, heating the steel billet to a set temperature;

step c, the billet is discharged from the furnace and reversely enters an electric induction heating device (leftwards in fig. 9) to be heated to the temperature required by the process;

step d, the billet is conveyed to a rolling mill for rolling after being conveyed through a discharge cantilever roller way (prior art) of the gas heating furnace rapidly from the electric induction heating device in the reverse direction (rightward in fig. 9 and along the set running direction of the workpiece).

The arrangement mode can also be suitable for the transformation of the existing rolling line. Likewise, the arrangement mode can also be connected with a straight roller way, thereby meeting the process requirement of adopting an electric induction heating device for direct rolling and heat compensation.

Examples ten

As shown in fig. 10, when the spatial arrangement of the side-in side-out heating furnace is limited, in the combined heating process structure of the steel rolling heating furnace, the side part of the inlet end of the gas heating furnace 1 is arranged in the furnace roller way 3, the side part of the outlet end of the gas heating furnace 1 is provided with the furnace discharging roller way 4, the outlet end of the gas heating furnace 1 is also provided with the bypass roller way 9, the bypass roller way 9 is provided with the electric induction heating device 2, the furnace discharging roller way 4 is provided with the outlet reverse roller way 10 in the direction opposite to the running direction of the workpiece, the steel moving device 11 is arranged between the outlet reverse roller way 10 and the electric induction heating device 2, and one side of the steel moving device 11 far away from the electric induction heating device 2 is provided with the direct rolling connection roller way 5.

The heating method of this embodiment is as follows: the method comprises the following steps:

step a, a steel billet is sent into a gas heating furnace 1 through a furnace feeding roller way 3;

step b, in the gas heating furnace 1, heating the steel billet to a set temperature;

step c, the billet is delivered reversely (leftwards in fig. 10) and enters the electric induction heating device 2 on the bypass roller way 9 through the steel moving device 11 to be rapidly heated to the temperature required by the process;

and d, outputting the billet from the electric induction heating device, merging the billet into a tapping roller way 4, and conveying the billet to a rolling mill along the running direction of a workpiece for rolling.

The arrangement mode can also be suitable for the transformation of the existing rolling line. Likewise, the arrangement mode can also be connected with a straight roller way, thereby meeting the process requirement of adopting an electric induction heating device for direct rolling and heat compensation.

The foregoing is illustrative of the present invention and is not to be construed as limiting the scope of the invention. Any equivalent changes and modifications can be made by those skilled in the art without departing from the spirit and principles of this invention, and are intended to be within the scope of this invention.

Claims (13)

1. A combined heating process structure of a steel rolling heating furnace is characterized in that,

the steel billet rolling device comprises at least one gas heating furnace, wherein an inlet or an outlet of the gas heating furnace is provided with an electric induction heating device, the electric induction heating device is used for heating or supplementing heat before rolling the steel billet, and the axial direction of the electric induction heating device is perpendicular to the axial direction of the gas heating furnace.

2. The steel rolling heating furnace combined heating process structure according to claim 1, wherein,

the inlet of the gas heating furnace is provided with a furnace feeding roller way, the outlet of the gas heating furnace is provided with a furnace discharging roller way, and the workpiece running directions of the furnace feeding roller way and the furnace discharging roller way are perpendicular to the workpiece running direction of the gas heating furnace; the electric induction heating device is arranged on the furnace feeding roller way or the furnace discharging roller way.

3. The combined heating process structure of a steel rolling heating furnace according to claim 2, wherein,

the electric induction heating device is arranged on the discharging roller way and is positioned on one side of the gas heating furnace along the running direction of the workpiece, or is positioned on one side of the gas heating furnace along the direction opposite to the running direction of the workpiece.

4. A combination heating process structure of a steel rolling heating furnace as claimed in claim 3, wherein,

and a direct rolling connection roller way is arranged in the direction which is coaxial with the tapping roller way and opposite to the workpiece running direction of the tapping roller way, and is used for directly conveying continuous casting direct rolling blanks into the electric induction heating device for heat compensation.

5. The steel rolling heating furnace combined heating process structure according to claim 1, wherein,

the gas heating furnace comprises a plurality of gas heating furnaces which are arranged in parallel, wherein the inlets of the gas heating furnaces are provided with furnace inlet roller tables, the outlets of the gas heating furnaces are provided with furnace outlet roller tables, and the furnace outlet roller tables are provided with a plurality of electric induction heating devices in parallel.

6. The steel rolling heating furnace combined type heating process structure according to claim 5, wherein each electric induction heating device is positioned at one side of the gas heating furnace along the workpiece running direction, and a direct rolling connection roller way is arranged in the direction which is coaxial with the discharging roller way and opposite to the workpiece running direction along the discharging roller way.

7. The combined heating process structure of a steel rolling heating furnace according to claim 5, wherein,

the electric induction heating device is positioned at one side of the gas heating furnace in the direction opposite to the running direction of the workpiece, and a direct rolling engagement roller way is arranged at one side of the electric induction heating device away from the gas heating furnace.

8. The steel rolling heating furnace combined heating process structure according to claim 1, wherein,

the gas heating furnace is of a side-in side-out structure; the side portion of the inlet end of the gas heating furnace is provided with a furnace entering roller way, the side portion of the outlet end of the gas heating furnace is provided with a furnace discharging roller way, the outlet end of the gas heating furnace is further provided with a bypass roller way, the bypass roller way is provided with an electric induction heating device, the direction of the furnace discharging roller way opposite to the running direction of a workpiece is provided with an outlet reverse roller way, a steel moving device is arranged between the outlet reverse roller way and the electric induction heating device, and one side of the steel moving device, which is far away from the electric induction heating device, is provided with a direct rolling connecting roller way.

9. A heating method of a combined heating process structure of a steel rolling heating furnace as claimed in claim 2, comprising:

step a, arranging an electric induction heating device on a furnace feeding roller way, feeding a steel billet into the electric induction heating device for heat supplement or heating, and feeding the steel billet into a gas heating furnace through the furnace feeding roller way;

step b, in the gas heating furnace, heating the steel billet to the temperature required by the rolling process;

and c, conveying the heated billet to a rolling mill for rolling through a tapping roller way.

10. A heating method of a combined heating process structure of a steel rolling heating furnace as claimed in claim 3, comprising:

step a, an electric induction heating device is positioned at one side of the gas heating furnace along the running direction of a workpiece, and a billet is fed into the gas heating furnace through a furnace feeding roller way;

step b, heating the steel billet to 800-1050 ℃ in a gas heating furnace;

step c, discharging the steel billet into an electric induction heating device on a discharging roller way, and heating the steel billet to 100-200 ℃ to 900-1250 ℃;

and d, conveying the heated billet to a rolling mill for rolling.

11. A heating method of a combined heating process structure of a steel rolling heating furnace as claimed in claim 3, comprising:

Step a, an electric induction heating device is positioned at one side of the gas heating furnace in the direction opposite to the running direction of the workpiece, and a billet is fed into the gas heating furnace through a furnace roller way;

step b, in the gas heating furnace, heating the steel billet to a set temperature;

step c, discharging the steel billet, reversely entering an electric induction heating device, and heating to the temperature required by the process;

and d, conveying the billet from the electric induction heating device to a rolling mill along the set running direction of the workpiece for rolling.

12. A heating method of a combined heating process structure of a steel rolling heating furnace as claimed in claim 4, comprising: the electric induction heating device is positioned at one side of the gas heating furnace along the running direction of the workpiece, and a billet is fed into the gas heating furnace through a furnace feeding roller way; directly conveying the continuous casting straight rolled blank into an electric induction heating device for heat compensation through a direct rolling connection roller way, and heating to the rolling process temperature; and after heating, the billet is sent to a rolling mill for rolling.

13. A heating method of a combined heating process structure of a steel rolling heating furnace as claimed in claim 8, comprising:

step a, a billet is sent into a gas heating furnace through a furnace feeding roller way;

step b, in the gas heating furnace, heating the steel billet to a set temperature;

Step c, discharging the steel billet, reversely conveying the steel billet, and feeding the steel billet into an electric induction heating device on a bypass roller way through a steel moving device to heat the steel billet to the temperature required by the process;

and d, outputting the billet from the electric induction heating device, merging the billet into a tapping roller way, and conveying the billet to a rolling mill along the running direction of a workpiece for rolling.

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