WO2012145967A1

WO2012145967A1 - Rapid feeding device and method for feeding scrap steel into electrical furnace

Info

Publication number: WO2012145967A1
Application number: PCT/CN2011/076815
Authority: WO
Inventors: 黄其明; 徐杰; 高瞻
Original assignee: 中冶赛迪工程技术股份有限公司
Priority date: 2011-04-25
Filing date: 2011-07-04
Publication date: 2012-11-01
Also published as: CN102183150A; CN102183150B

Abstract

Disclosed are a rapid feeding device and a feeding method for feeding scrap steel into an electrical furnace. The rapid feeding device comprises a high temperature coupling tank (10) in communication with the electrical furnace, and a cold material-receiving device for feeding in the scrap steel. The cold material-receiving device comprises a long feeding groove (2) that can be hoisted. The long feeding groove (2) has a discharge port (2a) made at its front end, that can be in sealed communication with a feeding port of the high temperature coupling tank (10). The rapid feeding device has good air tightness and a high feeding speed. The feeding is carried out in closed conditions, which can effectively reduce air leakage, and improve the performance of the electrical furnace dedusting system. The discharge port is made at the front end of the long feeding groove so that the thickness of the spread material can be easily controlled.

Description

Quick feeding device for adding scrap steel to electric furnace and feeding method thereof

Technical field

The invention belongs to the technical field of metallurgy, and particularly relates to a feeding device of an electric furnace smelting device and a feeding method thereof.

Background technique

Electric furnace smelting is an important steelmaking method. In the smelting process, the process of adding raw materials to the electric furnace directly affects the production environment and electric energy consumption. The most typical and common in electric furnace production is that the basket is directly fed to the furnace, but the production environment is extremely Poor, in order to improve the production environment and reduce power consumption, there has been a technology of rapidly sealing the feed into the electric furnace. This technology is a technology that saves energy and reduces environmental consumption in the production of electric furnaces.

When feeding certain raw materials, the implementation of the closed feeding technology of the electric furnace is very difficult, and the reliability of the implementation is also low. For example, the feeding of the scrap steel smelting production is difficult due to the size and shape of the scrap steel, and the reliability is low. In the analysis of the prior art, the patented "a short-flow scrap preheating conveyor" of the CEIBS application number 201020187991.6 and 201010170509.2 proposes a feeding technique, which proposes a 'container' concept for electric furnace feeding, but The bottom feed slot is used to feed the long groove. The main problems of the above technology are: the low bottom open tank has low reliability to open the bottom door, and there is a high probability event affecting the production efficiency. There is one more production step for feeding the long trough, and the thickness of the feed in the long trough is increased. It is not easy to control and affect the transportation of the subsequent scrap, and it will have an adverse impact on the impact of the feed material.

In view of the above shortcomings, it is necessary to develop a rapid feeding device for adding scrap steel to an electric furnace and a feeding method thereof, thereby improving the scrap feeding efficiency and increasing the reliability of feeding, and at the same time, the thickness of the paving in the feeding long groove is easy to control and Avoid feeding long grooves and shocking them to prolong their service life.

Summary of the invention

In view of this, the present invention provides a rapid feeding device for adding scrap steel to an electric furnace and a feeding method thereof, and the cold receiving trough is regarded as a "container" by the device and the feeding method thereof, thereby improving the feeding efficiency and increasing Feeding reliability, and the thickness of the paving in the long groove of the feeding can be controlled and the purpose of avoiding the impact of the long groove in the charging process.

The rapid feeding device for adding scrap steel to an electric furnace of the present invention comprises a high temperature coupling groove communicating with the electric furnace and a cold receiving conveying device for scrap steel feeding, the cold receiving conveying device comprising a hoistable moving feed The long groove and the front end of the feeding long groove are provided with a discharge port which can be in sealing communication with the feed port of the high temperature coupling groove.

Further, the cold receiving material conveying device further comprises a vibration table and an excitation device for driving the vibration of the vibration table. When the discharge port of the feeding long groove communicates with the feeding port of the high temperature coupling groove, the feeding long groove is placed on the vibration table. Countertop;

Further, the discharge port of the feeding long groove and the feed port of the high temperature coupling groove are sealed and communicated through the conveying throat, one end of the conveying throat extends into the high temperature coupling groove, and the other end is connected with the feeding slot of the long groove. Sealing butt or sealing sleeve outside the discharge port;

Further, the utility model further comprises a heat transfer tank, wherein the discharge port of the feed long groove communicates with the feed port of the high temperature coupling groove through the heat transfer groove, and the discharge port of the feed long groove passes through the feed port of the heat transfer groove The conveying throat is sealed and connected, one end of the conveying throat extends into the heat conveying groove, and the other end is sealed or butted out of the discharging port of the feeding long groove or sealed outside the discharging port;

Further, the conveying throat is fixedly disposed or fixedly connected to the vibration table;

Further, the cold receiving material conveying device further includes a buffer braking device acting on the vibration excitation device or the vibration table;

Further, the front end of the conveying throat in the conveying direction of the scrap steel is provided with an openable and sealing door;

Further, the feeding long groove is provided with an openable slot cover;

Further, a positioning locking mechanism is disposed between the vibration table and the feeding long groove;

Further, the discharge port of the feeding long groove is provided with an extractable retaining pin;

Further, the table top of the vibrating table is inclined;

Further, the quick-feeding device for adding scrap steel to the electric furnace further comprises a docking car reciprocally movable along the lateral direction of the quick-feeding device, the vibrating table and the vibrating device being two sets and juxtaposed in the lateral direction on the docking car ;

Further, the vibrating table and the vibrating device are two sets and are arranged side by side in the longitudinal direction of the quick feeding device, and the vibrating table is perpendicular to the high temperature coupling groove.

A second object of the present invention is to provide a method for feeding a fast charging device for adding scrap steel to an electric furnace by lifting or adding a long groove containing scrap steel to another method. On the vibration table, the buffer brake device can quickly decelerate or brake the vibration table. During the start-stop period, the small amplitude of the vibration table quickly crosses the resonance band and facilitates the installation of the long groove, so that the discharge port of the feed long groove is connected with the high temperature. The feeding port of the trough or the hot trough is docked through the conveying throat, the sealing door is opened and the retaining pin is pulled out, the trough cover is sealed throughout the process to prevent air inhalation, and the speed of the scrap steel can be controlled to enter the high temperature connecting trough or heat through the vibration of the vibrating table. The conveying trough closes the sealing door after the feeding is completed, and finally lifts and removes the feeding long groove, and the sealing door prevents the air from being sucked, and the above operation is repeatedly performed to realize continuous and rapid sealing feeding.

Beneficial effect

The rapid feeding device for adding scrap steel to an electric furnace and the feeding method thereof have the following advantages:

1 The device has simple structure, controllable feeding speed, convenient manufacture, simple operation, good sealing effect, high reliability, fast feeding speed, environmental protection and convenient maintenance of the whole system.

2 The feeding process is carried out under sealed conditions, which can effectively reduce the amount of air leakage, improve the efficiency of the electric furnace dust removal system, and greatly improve the production environment. At the same time, due to the closed production of the electric furnace, the heat loss of the furnace body during the electric furnace production process is also reduced. ,Energy saving.

3 Compared with the prior art, it is avoided to use the bottom opening trough to feed the long trough, and it is easy to grasp the thickness of the paving to facilitate the subsequent production, and also prevent the scrap from being damaged by the impact of the long trough (the long trough is cancelled).

4) The equipment is short, which is conducive to the transformation of the existing electric furnace, and the system investment is small.

DRAWINGS

The invention is further described below in conjunction with the drawings and embodiments.

Figure 1 is a schematic view showing the structure of the feeding long groove of the present invention before being lifted onto the vibration table;

2 is a schematic structural view of the feeding long groove of the present invention after being hoisted to the vibrating table and connected;

3 is a schematic structural view of a device with a heat transfer trough structure before the long slot is lifted onto the vibrating table;

Figure 4 is a schematic view showing the structure of the device with the heat transfer trough structure after the long trough is hoisted to the vibrating table and connected;

Figure 5 is a schematic view showing the loading process of the present invention;

Figure 6 is an example of the electric furnace smoking port of the present invention moved to a sealing cover;

Figure 7 is a schematic structural view of a continuous feeding device for continuous feeding;

Figure 8 is a schematic view showing the structure of another continuous feeding device.

Embodiments of the invention

The present invention will be described in detail below with reference to the accompanying drawings, as shown in the drawings: a rapid feeding device for adding scrap steel to an electric furnace, comprising a high temperature coupling groove 10 communicating with the electric furnace and a cold receiving conveying device for scrap steel feeding, The cold receiving conveying device comprises a long slot 2 for lifting and moving, and a long slot for feeding The front end of the second portion is provided with a discharge port 2a which can be in sealing communication with the feed port of the high temperature coupling groove 10. When feeding, the scrap steel is laid in the feeding long groove 2, and the long groove 2 is lifted by the lifting device to make the discharge port Connected to the feed port of the high temperature coupling groove Compared with the prior art, the feeding long groove 2 is fixedly arranged, and the scrap steel is added by a tool such as a disk hanging device, the feeding speed is fast, and the dust is not easily generated, and at the same time, the scrap is also added in the long groove 2 The thickness of the laying is controllable, which is conducive to the subsequent smelting. In addition, the impact of the scrap on the long groove of the feeding in the prior art feeding is also avoided.

As a further improvement of the above technical solution, the cold feed conveying device further comprises a vibration table 3 and an excitation device 4 for driving the vibration of the vibration table 3, and the feeding long groove When the discharge port 2a of 2 is in communication with the feed port of the high temperature coupling groove 10, the feed long groove 2 is placed on the table surface of the vibrating table 3, and the vibration of the vibrating table allows the scrap in the feeding long groove to smoothly pass through the high temperature coupling groove. It is transported to the electric furnace, and it is not easy to appear jamming, and the reliability is high.

As a further improvement of the above technical solution, the discharge port 2a of the feeding long groove 2 and the feed port of the high temperature coupling groove 10 are in sealing communication with the conveying throat 5, and one end of the conveying throat 5 extends into the high temperature coupling groove 10. The other end is sealed with the discharge port 2a of the feeding long groove 2 or sealed outside the discharge port 2a, and is easily docked by the conveying throat, which is advantageous for accelerating the charging speed. The throat technology can also be implemented on another electric furnace smelting device having a preheating dust dropping device, and the discharge port of the feeding long groove 2 of the device communicates with the feeding port of the high temperature coupling groove 10 through the heat transfer tank 1 The discharge port 2a of the feed long groove 2 and the feed port of the heat transfer tank 1 are sealedly connected through the transfer throat 5, and one end of the transfer throat 5 extends into the heat transfer groove 1 The other end is sealingly butted or sealed outside the discharge opening 2a with the discharge opening 2a of the feeding long groove 2.

As a further improvement of the above technical solution, the conveying throat 5 is fixedly disposed on the hot feeding groove or the dust falling cover above the hot feeding groove, and the structure is simple and reasonable, and is more favorable for achieving the sealing requirement; the conveying throat 5 The fixed connection with the vibrating table 3 is more conducive to the smooth transportation of the scrap steel.

As a further improvement of the above technical solution, the cold receiving conveying device further comprises a buffer braking device 9 acting on the excitation device 4 or the vibration table 3, and the loading mode of the invention determines that the vibration table starts and stops frequently, The buffer brake device can quickly decelerate or brake the vibration table, or make the small amplitude of the vibration table quickly cross the resonance band during startup, and avoid the resonance caused by the frequent start and stop of the vibration table to cause greater damage to the device. Reduce equipment maintenance frequency and extend equipment life.

As a further improvement of the above technical solution, one end of the conveying throat 5 extending into the heat transfer tank 1 is provided with an openable and closable sealing door 6, which is opened only when feeding, and the space and the feeding length in the heat conveying groove are long. The trough space forms a confined space, the air leakage is small, and the energy consumption is reduced. The electric furnace is produced under closed conditions when feeding or unfeeding, which effectively reduces the heat loss of the furnace body during the electric furnace production process and saves energy.

As a further improvement of the above technical solution, the feeding long groove 2 is provided with an openable groove cover 2b. In order to facilitate the opening of the cover, and to seal the communication with the outside air during the feeding process.

As a further improvement of the above technical solution, a positioning locking mechanism 7 is disposed between the vibrating table 3 and the feeding long groove 2, which is convenient for rapid positioning, is favorable for increasing the charging speed, and at the same time, placing the feeding long groove on the vibration table. Stable and reliable to avoid security incidents.

As a further improvement of the above technical solution, the discharge port 2a of the feeding long groove 2 is provided with an extractable stopper pin 8, and the feeding long groove is placed to cause a safety accident when the scrap steel falls during lifting.

As a further improvement of the above technical solution, the table top of the vibrating table 3 is inclined, so that the scrap steel can be automatically transported into the heat transfer tank under the action of vibration and gravity.

As a further improvement of the above technical solution, the quick-feeding device further comprises a docking cart 13 reciprocally movable along a lateral direction of the quick-feeding device, the transverse direction of the quick-feeding device being a direction perpendicular to the direction of scrap steel conveyance in a horizontal plane, the vibrating table 3 And the excitation device 4 are two sets and are arranged side by side in the lateral direction on the docking vehicle 13 Above, as shown in FIG. 7, the two vibrating tables 3 are used one by one. When one feeding long groove 2 is working on the high temperature coupling groove 10, the other feeding long groove 2 is mounted on the standby vibrating table 3, the docking car 13 realization of the feed long groove 2 The rapid switching can reduce the switching time of the feed long tank 2 to less than about 1 minute, so that the electric furnace can be continuously produced. In addition to the above scheme, two sets of the vibrating table 3 and the excitation device 4 may be arranged side by side in the longitudinal direction of the rapid feeding device, and the vibrating table 3 is perpendicular to the high temperature coupling groove 10, as shown in FIG. When one feed long groove 2 is used to feed the high temperature coupling groove 10, the other feed long groove 2 is mounted on the standby vibration table 3, and the two feed long grooves are quickly switched to realize continuous feeding without gaps.

Fig. 6 is a view showing an example in which the electric furnace smoking port 11 is moved to the sealing cover 12 above the heat transfer tank 1, and the conveying throat 5 is sleeved with the feeding long groove 2.

The method of feeding the above-mentioned quick charging device for adding scrap steel to an electric furnace is carried out by lifting the feeding long groove 2 containing the scrap steel onto the vibrating table 3, and connecting the discharge port 2a of the feeding long groove 2 with the high temperature. The feed port of the tank 10 or the heat transfer tank 1 is docked or sleeved through the transfer throat 5, the sealing door 6 is opened and the stopper pin 8 is withdrawn, and the entire process tank cover 2b prevents air from being sucked in, and the scrap steel enters through the vibration of the vibration table 3 The high temperature coupling groove 10 or the heat transfer tank 1 closes the sealing door 6 after the feeding is completed, and the opening and closing of the sealing door 6 prevents the air from being sucked in during the feeding process, and finally lifts and removes the feeding long groove 2, and hoists a new steel-filled steel. The feeding long groove repeats the above operations to achieve continuous rapid feeding. The empty feeding long tank 2 is transported to the raw material field, the tank cover is opened for batching and charging, and finally the tank cover is sealed for transport to the electric furnace, and the whole feeding process is as shown in FIG. 5 .

Feeding by hoisting method, the feeding speed is fast, and the implementation is convenient. In addition, the feeding process is carried out under closed conditions to reduce heat loss and reduce energy consumption.

The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to be limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art Modifications or equivalents are intended to be included within the scope of the appended claims.

Claims

A rapid feeding device for adding scrap steel to an electric furnace, comprising a high temperature coupling groove (10) communicating with the electric furnace and a cold receiving conveying device for scrap steel feeding, characterized in that the cold receiving conveying device comprises The moving long groove (2) can be lifted, and the front end of the feeding long groove (2) is provided with a discharge port (2a) which can be in sealing communication with the feed port of the high temperature coupling groove (10).
A quick-feeding device for adding scrap steel to an electric furnace according to claim 1, wherein the cold-receiving conveying device further comprises a vibration table (3) and an excitation for driving the vibration table (3) The feeding device (4), the feeding opening (2a) of the feeding long groove (2) is in communication with the feeding port of the high temperature coupling groove (10), and the feeding long groove (2) is placed on the table surface of the vibration table (3).
The quick charging device for adding scrap steel to an electric furnace according to claim 2, characterized in that: the discharge port (2a) of the feeding long groove (2) and the feed port of the high temperature coupling groove (10) It is sealed and connected through the conveying throat (5). One end of the conveying throat (5) extends into the high temperature coupling groove (10), and the other end is sealed with the discharge opening (2a) of the feeding long groove (2) or the sealing sleeve. Outside the discharge port (2a).
The quick-feeding device for adding scrap steel to an electric furnace according to claim 2, further comprising a heat transfer tank (1), wherein the discharge port of the feed long groove (2) passes through the heat transfer tank (1) ) communicating with the feed port of the high temperature coupling groove (10), and the discharge port (2a) of the feed long groove (2) and the feed port of the heat transfer tank (1) are sealed by the transfer throat (5) Connected, one end of the conveying throat (5) extends into the heat transfer tank (1), and the other end is sealingly abutted with the discharge port (2a) of the feeding long groove (2) or sealed outside the discharge port (2a).
A quick-feeding device for adding scrap steel to an electric furnace according to claim 3 or 4, characterized in that the conveying throat (5) is fixedly arranged or connected to the vibration table (3).
A quick charging device for adding scrap steel to an electric furnace according to claim 5, characterized in that the cold receiving material conveying device further comprises a buffer brake acting on the vibration excitation device (4) or the vibration table (3) Device (9).
A quick charging device for adding scrap steel to an electric furnace according to claim 6, characterized in that the conveying throat (5) is provided with an openable and closable sealing door (6) at the front end of the scrap conveying direction.
The quick charging device for adding scrap steel to an electric furnace according to claim 7, characterized in that the feeding long groove (2) is provided with an openable groove cover (2b).
A quick charging device for adding scrap steel to an electric furnace according to claim 8, characterized in that a positioning locking mechanism (7) is arranged between the vibrating table (3) and the feeding long groove (2).
A quick charging device for adding scrap steel to an electric furnace according to claim 9, characterized in that the discharge opening (2a) of the feeding long groove (2) is provided with an extractable stopper pin (8).
A rapid charging device for adding scrap steel to an electric furnace according to claim 10, characterized in that the table top of the vibration table (3) is inclined.
A quick-feeding device for adding scrap steel to an electric furnace according to claim 11, further comprising a docking car (13) reciprocally movable along a lateral direction of the quick-feeding device, said vibrating table (3) and The vibrating device (4) is two sets and is juxtaposed in the lateral direction on the docking car (13).
A quick-feeding device for adding scrap steel to an electric furnace according to claim 11, wherein the vibrating table (3) and the vibrating device (4) are two sets and are juxtaposed along the longitudinal direction of the quick-feeding device, The vibration table (3) is perpendicular to the high temperature coupling groove (10).
A method for feeding a fast charging device for adding scrap steel to an electric furnace according to claims 1-13, characterized in that the feeding long groove (2) containing scrap steel is lifted onto the vibration table (3), The discharge port (2a) of the feed long groove (2) is docked with the feed port of the high temperature coupling groove (10) or the heat transfer tank (1) through the transfer throat (5), the sealing door (6) is opened and the block is pulled out. The material pin (8), the whole process tank cover (2b) is sealed to prevent air from being sucked in, and the scrap steel enters the high temperature coupling groove (10) or the heat transfer tank (1) by the vibration of the vibration table (3), and the sealing door is closed after the feeding is completed. (6) Finally, the lifting and unloading long groove (2) is removed, and the sealing door (6) is prevented from inhaling air, and the above operation is repeatedly performed to realize continuous and rapid sealing feeding.