CN106424623A - Device and method for cleaning continuous casting slab through lateral-frontal sweeping - Google Patents

Abstract

The invention provides a flame cleaning device and method for purging the front side of the continuous casting slab, the device includes a horizontal distributor, a vertical distributor, a burner unit and an energy medium pipeline, and the burner unit is installed above and below the roller table And on both sides of the roller table, each energy medium pipeline is connected with the horizontal distributor and the vertical distributor, and the high-temperature slag is washed away by the horizontal slag flushing water gun and the vertical slag flushing water gun. The method comprises: preheating the initial region of the end of the continuous casting slab until an initial molten pool is formed; purging the initial molten pool, and the continuous casting slab and the flame cleaning device start relative motion; the initial molten pool diffuses, and the continuous casting slab The relative motion advances the initial molten pool to cover the entire surface of the continuous casting slab, and at the same time, the generated slag is washed away by high-pressure slag flushing water, and the defects on the surface of the continuous casting slab are cleaned and removed. The invention adopts the side and front blowing method, which can effectively improve the "ditch"-shaped cleaning groove marks existing on the surface of the continuous casting slab after cleaning.

Description

Flame cleaning device and method for blowing side and front of continuous casting slab

technical field

The invention relates to the technical field of metallurgical industry, in particular to a flame cleaning device and method for purging the side and front of a continuous casting slab.

Background technique

In recent years, with the development of the continuous casting process and the increasing demand for high value-added steel products, users have increasingly strict requirements on the surface quality of slabs. Continuous casting slab flame cleaning refers to a processing technology that removes the thin layer (generally 1.5~4.5mm) on the surface of the slab by melting the metal, and then removes the surface defects. It can effectively improve the surface quality of the final product. It has become a necessary link in the rolling process of high-quality steel grades. At present, the most common problem in the flame cleaning process is that the cleaning surface is not uniform, and there are cleaning groove marks distributed in "valleys" and "peaks" along the longitudinal direction of the slab. The previous solutions mainly focused on the optimization of the structure of the cleaning machine and the improvement of the operating conditions, and seldom involved the improvement of the process method, and there were almost no effective measures to eliminate the defect of cleaning groove marks.

Contents of the invention

Aiming at the deficiencies in the prior art, the present invention provides a flame cleaning device and method for purging the side and front of the continuous casting slab.

Technical scheme of the present invention is as follows:

A flame cleaning device for purging the front side of the continuous casting slab, including horizontal distributors, vertical distributors, burner units and energy media pipelines, several burner units are installed above and below the roller table through horizontal distributors, several The burner units are installed on both sides of the roller table through the vertical distributor. Each burner unit performs flame cleaning on the upper surface, lower surface and two sides of the continuous casting slab at the same time. Two adjacent burner units are positioned and connected. The burner units above and below the roller table are at an inclined angle to the horizontal direction, and the burner units installed on both sides of the roller table are at an inclined angle to the vertical direction, so that the combustion flame is blown forward and sideways, and each can The medium pipeline is connected with the horizontal distributor and the vertical distributor, and the high-temperature slag generated during the flame cleaning process is washed away by the horizontal slag flushing water gun and the vertical slag flushing water gun.

The burner unit includes: a burner body, an upper block, a lower block and a shoe block;

The main body of the burner has four rows of energy media channels arranged in parallel, including preheating oxygen channels, preheating gas channels, cleaning oxygen channels, and cleaning gas channels. The entrances of each row of energy media channels are set on the same surface of the burner body. The Nengjie channel includes 9 independent channels, and there are four channels around the Nengjie channel, which are the upper water inlet channel, the upper water outlet channel, the side water inlet channel, and the side water outlet channel;

The main body of the burner is connected and fixed with the horizontal distributor or the vertical distributor, and the upper block, lower block and shoe block are all fixed with the main body of the burner, and the inclination angle formed by the upper block and the lower block and the continuous casting slab is the same;

The shoe block is in direct contact with the continuous casting slab during the transportation of the continuous casting slab, and the bottom of the shoe block is provided with a high-temperature resistant gasket;

The slit formed between the upper block and the lower block is the outlet of the cleaning oxygen channel, and an oxygen barrier is arranged near the outlet of the cleaning oxygen channel, and the two ends of the oxygen barrier are respectively sealed by barrier plugs. The oxygen in the channel flows through the oxygen grille and is mixed together to form a sheet-shaped oxygen jet, which is discharged through the outlet of the cleaned oxygen channel;

The cleaning gas channel leads to the interior of the lower block and forms the outlet of the cleaning gas channel on the surface of the lower block. A gas grille is arranged near the outlet of the cleaning gas channel. The two ends of the gas grille are sealed by grill plugs respectively. The channel is further divided into 5 small channels that do not mix with each other, forming 45 gas nozzle outlets as the outlet of the cleaning gas channel;

The preheating oxygen channel and the preheating gas channel respectively lead to the inside of the upper block and respectively form the outlet of the preheating oxygen channel and the outlet of the preheating gas channel on the surface of the upper block. Grille or gas grille, each independent channel in the preheating oxygen channel or preheating gas channel is divided into 5 small channels that do not mix with each other, forming 45 oxygen nozzle outlets or gas nozzle outlets as preheating oxygen Channel outlet or preheated gas channel outlet. The energy media pipeline includes: preheating oxygen pipeline, preheating gas pipeline, cleaning oxygen pipeline, cleaning gas pipeline.

The inclination angle is between 5° and 15°.

The flame cleaning device is provided with two sets of cooling water circuits, including the first cooling water circuit formed by the upper water inlet pipe and the upper water outlet pipe, and the second cooling water circuit formed by the side water inlet pipe and the side water outlet pipe;

Cooling water enters the horizontal distributor or vertical distributor from the upper water inlet pipe, then flows into the burner body, lower block and shoe block of each burner unit, and finally flows out from the upper water outlet pipe to form the first cooling water circuit; the shoe block is directly connected to the The continuous casting slab is in contact, the cooling water channel runs through the entire shoe block, and is sealed by the water plug;

The cooling water enters the horizontal distributor or vertical distributor through the side inlet pipe, then flows into the burner body and upper block of each burner unit, and finally flows out through the side outlet pipe to form the second cooling water circuit.

The nozzles of the nozzle outlet of the cleaning gas passage, the nozzle outlet of the preheating gas passage and the nozzle outlet of the preheating oxygen passage are all inserted into replaceable core pipes.

The connection between the horizontal distributor, the vertical distributor and the burner unit, and the connection between the components of the burner unit are all sealed by sealing rings.

The flame cleaning method of purging the front side of the continuous casting slab by using the flame cleaning device includes:

(A), using the heat generated by the combustion of gas and oxygen to preheat the initial area of the end of the continuous casting slab until the initial molten pool is formed, and the preheating of the continuous casting slab is completed;

(B), using high-pressure oxygen to purge the initial molten pool, the continuous casting slab and the flame cleaning device start relative movement;

(C) The intense oxidation reaction between the high-pressure oxygen and the continuous casting slab causes the initial molten pool to diffuse, and the relative motion of the continuous casting slab pushes the initial molten pool to cover the entire surface of the continuous casting slab. The slag is washed away, and the defects on the surface of the continuous casting slab are cleaned and removed.

Said step (A) comprises:

(a) Use the horizontal distributor, vertical distributor and burner unit to clamp the continuous casting slab to complete the circumferential positioning;

(b) The horizontal slag flushing water gun and the vertical slag flushing water nozzle are aimed at the edge of the continuous casting slab, and after the burner unit touches the continuous casting slab, lift it up and assume a floating state;

(c), the roller table reverses and starts, and the continuous casting slab is withdrawn;

(d) The initial area of the end of the continuous casting slab is heated by a high-temperature combustion flame formed by gas and oxygen, and the initial molten pool is formed after reaching the melting point.

Said step (c) comprises:

(a) The continuous casting slab is transported by the roller table at a constant speed through the flame cleaning device, the initial molten pool spreads and covers the entire surface of the slab, and at the same time, the generated slag is washed away by high-pressure slag flushing water;

(b) After the continuous casting slab leaves the area of the flame cleaning device, the continuous casting slab is put into storage.

Beneficial effect:

The flame cleaning device of the present invention adopts the side and front blowing method, which can effectively improve the "ditch"-shaped cleaning groove marks existing on the surface of the continuous casting slab after cleaning. The upper block and the lower block of the burner unit structure are inclined to the same side at a certain angle, so that while the combustion flame is blown forward, there is also the momentum and energy of blowing to the side, so that the energy distribution on the surface of the slab is better. For uniformity, the point-like distribution is changed to a linear distribution, so that a metal molten pool shape with a consistent depth is formed in the preheating stage, so that the defective surface layer with a uniform thickness can be removed during the cleaning stage, and the continuous casting can be effectively suppressed. The distribution phenomenon of "valleys" and "peaks" that often appear on the surface of the slab results in a clean surface with better flatness, which meets the rolling requirements of high-quality steel products with high requirements on the surface quality of continuous casting slabs.

Description of drawings

Fig. 1 is a schematic structural view of a flame cleaning device for purging on the front side of a continuous casting slab according to a specific embodiment of the present invention;

Fig. 2 is a schematic view of the structure of the burner unit according to the specific embodiment of the present invention;

Among them, (a) is a schematic diagram of the overall structure of the burner unit;

(b) is a schematic diagram of each part of the burner unit;

(c) is a schematic diagram of the burner body structure of the burner unit;

(d) is a schematic diagram of the upper block structure of the burner unit;

(e) is a schematic diagram of the lower block structure of the burner unit;

(f) is a schematic diagram of the shoe block structure of the burner unit;

Fig. 3 is a schematic diagram of the flame cleaning process for purging the front side of the continuous casting slab according to the specific embodiment of the present invention;

Among them, (a) is a schematic diagram of the process of sending the continuous casting slab into the flame cleaning device in the positioning stage;

(b) is a schematic diagram of the process of heating the continuous casting slab with a combustion flame to form an initial molten pool during the preheating stage;

(c) is a schematic diagram of the process of roller conveying continuous casting slab moving to push the molten pool to remove surface defects in the cleaning stage;

(d) is a schematic diagram of the flame cleaning device waiting for the next cleaning operation in the reset stage;

Among them, 1-horizontal distributor, 2-vertical distributor, 3-burner unit, 4-continuous casting slab, 5-preheating oxygen pipeline, 6-preheating gas pipeline, 7-cleaning oxygen pipeline, 8-clear gas pipeline, 9-big purified air pipeline, 10-small purified air pipeline, 11-upper water inlet pipe, 12-upper water outlet pipe, 13-side water inlet pipe, 14-side water outlet pipe, 15-automatic ignition Device, 16-horizontal slag washing nozzle, 17-vertical slag washing nozzle, 18-burner body, 19-upper block, 20-lower block, 21-shoe block, 22-preheating oxygen channel, 23-preheating gas channel , 24-cleaning oxygen channel, 25-cleaning gas channel, 26-upper water inlet channel, 27-upper water outlet channel, 28-side water inlet channel, 29-side water outlet channel, 30-locating bolt, 31-stud, 32 -nut, 33-bolt, 34-pin, 35-pin hole, 36-oxygen grille, 37-gas grille, 38-barrier plug, 39-water plug, 40-core tube, 41-sealing ring, 42 - high temperature gasket, 43 - slab positioner.

detailed description

The specific implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings. The purpose of the invention is to solve the problem of cleaning groove marks on the surface of continuous casting slabs in the flame cleaning process. The side and front purge method is adopted to suppress the influence of the jet Coanda effect on the merger of gas combustion flames and the different jet intensities, so that the heat source distribution of the preheating molten pool is more uniform, forming a molten pool shape with a consistent depth, and advancing the melting during the flame cleaning stage. The pool covers the entire surface of the slab to eliminate cleaning groove marks and achieve a uniform and consistent removal thickness in the transverse direction of the continuous casting slab.

In this embodiment, the flame cleaning device for purging the front side of the continuous casting slab as shown in FIG. When the slab 4 advances, the slab positioner 43 is used to realize the horizontal positioning of the continuous casting slab 4, and at the same time, the horizontal distributor 1, the vertical distributor 2 and the burner unit 3 are used to clamp the continuous casting slab 4 to realize the circumferential positioning. This cleaning process is also suitable for single-sided cleaning and double-sided cleaning. The flame cleaning device includes a horizontal distributor 1, a vertical distributor 2, a burner unit 3 and an energy medium pipeline. 3. An important part that plays the role of gas distribution. It also includes auxiliary devices, such as a slab positioner 43, an automatic ignition device 15, a horizontal slag flushing water gun 16, and a vertical slag flushing water gun 17.

Energy-mediated pipelines include: preheating oxygen pipeline 5, preheating gas pipeline 6, cleaning oxygen pipeline 7, and cleaning gas pipeline 8. Each energy medium pipeline is connected with the horizontal distributor 1 and the vertical distributor 2, and the high-temperature slag generated during the flame cleaning process is washed away by the horizontal slag flushing water gun 16 and the vertical slag flushing water nozzle 17.

The width of the burner unit 3 is 200-350 mm, and the surface of the continuous casting slab 4 of the corresponding width can be cleaned at most. Several burner units 3 are installed above and below the roller table through the horizontal distributor 1, several burner units 3 are installed on both sides of the roller table through the vertical distributor 2, and each burner unit 3 is installed on the upper surface of the continuous casting slab 4 , the lower surface and two side surfaces are flame cleaned, and two adjacent burner units 3 are positioned and connected through pin holes 35, and each burner unit 3 installed above and below the roller table is at an inclined angle to the horizontal direction, and installed on the roller table. Each burner unit 3 on both sides of the channel has an inclination angle with the vertical direction. If the inclination angle is too large, the combustion flame will be too sharp, which is not good for cleaning uniformity. If the inclination angle is too small, the side and front blowing effect will not be obvious. In the embodiment, the inclination angle is 5-15°. The combustion flame generated by the flame cleaning device can sweep forward and sideways at the same time, thereby generating the momentum of forward sweeping and sideward sweeping, making the energy distribution on the surface of the slab more uniform, changing from point distribution to The purpose of the linear distribution is to form a metal molten pool shape with consistent depth in the lateral direction of the continuous casting slab 4, so as to advance the molten pool to remove the defect surface layer with uniform thickness during the flame cleaning stage.

The burner unit 3 is the core component of the device, which realizes side and front purge flame cleaning. The burner unit 3 is shown in FIG. 2 . In order to reduce processing difficulty and facilitate installation and replacement, the burner unit 3 is shown in Figure 2(a), including: a burner body 18 (as shown in Figure 2(c)), an upper block 19 (as shown in Figure 2(d) shown), the lower block 20 (as shown in Figure 2(e)) and the shoe block 21 (as shown in Figure 2(f)); the burner body 18 is connected with the horizontal distributor 1 or the vertical distributor 2 through the positioning bolt 30 fixed, the upper block 19 and the lower block 20 are fixed to the burner main body 18 through studs 31 and nuts 32, the shoe block 21 is fixed to the burner main body 18 through bolts 33, the burner main body 18 is connected to the upper block 19 and the lower block 20 They are positioned and connected by pins 34 , and the burner units 3 are positioned and connected by pin holes 35 .

The upper block 19, the lower block 20 and the continuous casting slab 4 form the same inclination angle. The shoe block 21 is in direct contact with the continuous casting slab 4 during the transportation of the continuous casting slab 4 . Because the shoe block 21 is in direct contact with the slab, its temperature is the highest in the whole side front blowing flame cleaning device, and the bottom of the shoe block 21 is provided with a high-temperature resistant gasket 42, which is easy to replace when damaged. The connections between the horizontal distributor 1 , the vertical distributor 1 and the burner unit 3 , and the connections between the components of the burner unit 3 are all sealed by a sealing ring 41 .

As shown in Figure 2 (a), (b) and (c), the burner body 18 has four rows of energy media channels arranged in parallel, including preheating oxygen channels 22, preheating gas channels 23, cleaning oxygen channels 24, cleaning The gas channel 25 plays a leading role in the preheating stage and the cleaning stage respectively. The entrances of each row of energy media channels are arranged on the same surface of the burner body 18. Each row of energy media channels contains 9 independent channels, and the four channels located around They are respectively an upper water inlet channel 26, an upper water outlet channel 27, a side water inlet channel 28, and a side water outlet channel 29.

As shown in Figure 2 (a), the slit formed between the upper block 19 and the lower block 20 is the outlet of the cleaning oxygen channel 24; as shown in Figure 2 (b), an oxygen barrier is arranged near the outlet of the cleaning oxygen channel 24 36. The two ends of the oxygen barrier 36 are respectively sealed by barrier plugs 38, and the oxygen in each independent channel in a row of cleaning oxygen channels 24 flows through the oxygen barrier 36 and is mixed together to form a sheet-like oxygen jet. After cleaning the oxygen channels 24 Exit discharge.

The cleaning gas channel 25 leads to the inside of the lower block 19 and forms the outlet of the cleaning gas channel 25 on the surface of the lower block 20. A gas grille 37 is arranged near the outlet of the cleaning gas channel 25. The two ends of the gas grille 37 are respectively sealed by grille plugs 38. Each independent passage in the cleaning gas passage 25 is further divided into 5 small passages that do not mix with each other, forming 45 outlets of gas nozzles as the outlets of the cleaning gas passage 25.

The preheating oxygen channel 22 and the preheating gas channel 23 respectively lead to the inside of the upper block 19 and respectively form the outlet of the preheating oxygen channel 22 and the outlet of the preheating gas channel 23 on the surface of the upper block 19, close to the outlet of the preheating oxygen channel 22 or the preheating An oxygen grid 36 or a gas grid 37 is arranged at the outlet of the gas channel 23, and each independent channel in the preheating oxygen channel 22 or the preheating gas channel 23 is further divided into 5 small channels that are not mixed with each other, forming 45 The outlet of the oxygen nozzle or the outlet of the gas nozzle is used as the outlet of the preheating oxygen channel 22 or the outlet of the preheating gas channel 23 .

The upper block 19 and the lower block 20 are inclined to the same side at a certain angle, so that the gas jet direction of the nozzle outlet of the preheating oxygen channel 22, the nozzle outlet of the preheating gas channel 22, and the nozzle outlet of the cleaning gas channel 25 are consistent with the direction of the continuous casting slab 4 There is a certain angle horizontally or vertically, and while the combustion flame is blowing forward, it also has the momentum and energy of blowing sideways, so that the heat source of the preheating molten pool is distributed more evenly in the transverse direction of the continuous casting slab 4, and the continuous casting The formation of a uniform molten pool shape in the preheating stage of the cast slab 4 also ensures a uniform and consistent defect surface metal removal thickness during the advancing process of the molten pool in the flame cleaning stage. After the flame cleaning is completed, there will be no longitudinal "ridge"-shaped cleaning groove marks on the surface of the continuous casting slab, but a high-level cleaning surface.

At the outlet of the preheating oxygen channel 22, the outlet of the preheating gas channel 23, and the outlet of the cleaning gas channel 25 of the burner unit 3, while the combustion flame is purging forward, it also has the momentum and energy of sideways purging, reducing or eliminating the cleaning plate The difference between "valleys" and "peaks" on the surface of the billet can obtain a clean surface with better flatness. Since each nozzle outlet is very close to the molten pool, high-temperature slag is likely to cause blockage. In the present invention, a core tube 40 is inserted into each nozzle outlet. When the nozzle outlet is blocked, only the core tube 40 needs to be replaced.

The flame cleaning device shown in Figure 1 is also provided with two sets of cooling water loops to cool the burner unit 3 in a high-temperature working environment. The cooling water channel located at the shoe needs to be drilled during processing. The end is sealed with a water plug 39, and the two sets of cooling water circuits are respectively the first cooling water circuit formed by the upper water inlet pipe 11 and the upper water outlet pipe 12, and the second cooling water circuit formed by the side water inlet pipe 13 and the side water outlet pipe 14;

Cooling water enters the horizontal distributor 1 or vertical distributor 2 from the upper water inlet pipe 11, then flows into the burner body 18, the lower block 19 and the shoe block 21 of each burner unit 3, and finally flows out from the upper water outlet pipe 12 to form the first Cooling water circuit: the shoe block 21 is in direct contact with the continuous casting slab 4, the cooling water channel runs through the entire shoe block 21, and is sealed by the water plug 39;

The cooling water enters the horizontal distributor 1 or the vertical distributor 2 through the side inlet pipe 13, then flows into the burner body 18 and the upper block 19 of each burner unit 3, and finally flows out through the side outlet pipe 14 to form the second cooling water circuit .

The whole set of flame cleaning device is closed in working state, and the continuous casting slab 4 is transported through it by the roller table, so that surface defects on the upper, lower and two sides of the continuous casting slab 4 can be removed. The upper and lower horizontal distributors 1 can install at most eight burner units 3, and the left and right vertical distributors 2 can install at most one burner unit 3. The energy-medium pipeline passes the gas and cooling water into the upper and lower horizontal distributors 1 and the left and right vertical distributors 2, and then transports them to each burner unit 3.

The main working media of the flame cleaning device include: oxygen, gas, purified air, circulating cooling water and high-pressure slag washing water. The preheating oxygen pipeline 5 and the preheating gas pipeline 6 deliver the gas to the upper block 19 of the burner unit 3, and form a combustion flame at the outlet, which is mainly used to heat the continuous casting slab 4 to form an initial molten pool. Clean the oxygen pipeline 7 and clean the gas pipeline 8 to deliver the combustion gas to the lower block 20 of the burner unit 3, which is mainly used to purge the molten pool and advance to cover the entire surface of the continuous casting slab 4, while using high-pressure slag flushing water to The slag is flushed away, thereby realizing the removal of surface defects of the continuous casting slab 4 . Because the nozzle outlet diameter of the nozzle unit 3 is very small, it is necessary to use the large purified air pipeline 9 and the small purified air pipeline 10 to feed the purified air when the flame cleaning device is reset and wait for the operation to keep the pipeline unobstructed and prevent the burner unit 3 from burning. All exits are blocked. Due to the high temperature of the working environment, the upper water inlet pipe 11 , the upper water outlet pipe 12 , the side water inlet pipe 13 and the side water outlet pipe 14 are used to transport circulating cooling water to realize the cooling of the burner unit 3 .

The auxiliary devices of the flame cleaning device include: an automatic ignition device 15 , a horizontal slag flushing water gun 16 , a vertical slag flushing water gun 17 , and a slab positioner 43 . The automatic ignition device 15 is used for the ignition of the flame cleaning device before the preheating stage starts, and the electric spark generated by the spark plug ignites the mixed gas. The horizontal slag flushing water gun 16 and the vertical slag flushing water nozzle 17 are used to flush the high-temperature molten slag generated during the cleaning process into the slag pool, and the slab positioner 43 is used to clamp the continuous casting slab 4 during the conveyance process 4 The horizontal positioning of the continuous casting slab 4 is realized on both sides.

A flame cleaning method for purging the front side of a continuous casting slab by using a flame cleaning device, comprising:

(A), using the heat generated by the combustion of gas and oxygen to preheat the initial area of the end of the continuous casting slab until the initial molten pool is formed, and the preheating of the continuous casting slab is completed;

(B), using high-pressure oxygen to purge the initial molten pool, the continuous casting slab and the flame cleaning device start relative movement;

(C) The intense oxidation reaction between the high-pressure oxygen and the continuous casting slab causes the initial molten pool to diffuse, and the relative motion of the continuous casting slab pushes the initial molten pool to cover the entire surface of the continuous casting slab. The slag is washed away, and the defects on the surface of the continuous casting slab are cleaned and removed.

Said step (A) comprises:

(a), using the horizontal distributor 1, the vertical distributor 2, and the burner unit 3 to clamp the continuous casting slab 4 to complete the circumferential positioning;

Use the roller table to transport the continuous casting slab 4 to the main body area of the flame cleaning device, start the slab positioner 43 to clamp the two sides of the continuous casting slab 4 to achieve horizontal positioning, and transport the continuous casting slab 4 into the fixed position, two levels up and down The distributor 1, the left and right vertical distributors 2 and the burner unit 3 clamp the continuous casting slab 4 to complete the circumferential positioning;

(b), the horizontal slag flushing water gun 16 and the vertical slag flushing water nozzle 17 are aligned with the edge position of the continuous casting slab 4, and after the burner unit 3 touches the continuous casting slab 4, lift it up by 25mm and assume a floating state;

(c), the roller table is reversed and started, and the continuous casting slab 4 is withdrawn to the preheating position;

(d), start the automatic ignition device 15, close the large purified air pipeline 9 and the small purified air pipeline 10, preheat the oxygen pipeline 5, preheat the gas pipeline 6, clean the oxygen pipeline 7, and clean the gas pipeline 8 Open it, use the high-temperature combustion flame formed by gas and oxygen to heat the initial area of the end of the continuous casting slab 4, and form the initial molten pool after reaching the melting point.

Said step (c) comprises:

(a) Start the roller table again, and the roller table transports the continuous casting slab 4 through the flame cleaning device at a constant speed, the initial molten pool spreads and covers the entire slab surface, and at the same time, the generated slag is washed away by high-pressure slag washing water;

(b) After the continuous casting slab 4 leaves the area of the flame cleaning device, preheat the oxygen pipeline 5, preheat the gas pipeline 6, clean the oxygen pipeline 7, clean the gas pipeline 8, and close the large purified air pipeline 9, The small cleaning air pipeline 10 is opened, the valve of the high-pressure slag flushing water gun is closed, and the cleaning is completed, and the continuous casting slab 4 is put into storage. The flame cleaning device resets and waits for the next cleaning operation. During the whole working process, the two sets of cooling water circuits are always open to cool the horizontal distributor 1, vertical distributor 2 and burner unit (4). When each energy medium pipeline was closed, the large purified air pipeline 9 and the small purified air pipeline 10 were opened all the time to keep the preheating oxygen passage 22, the preheating gas passage 23, the cleaning oxygen passage 24, and the cleaning gas passage 25 unobstructed to prevent Nozzle outlet is clogged.

The flame cleaning process of the above continuous casting slab is shown in Figure 3(a)~(d). First, in the positioning stage, the continuous casting slab is sent to the calibration position of the flame cleaning device, as shown in Fig. 3(a). Secondly, in the preheating stage, the combustion flame is used to heat the slab to form an initial molten pool, as shown in Fig. 3(b). Again, the movement of the slab conveyed by the roller table makes the molten pool advance to remove the surface defects of the slab, as shown in Fig. 3(c). Finally, the flame cleaning device enters the reset stage and waits for the next cleaning operation, as shown in Figure 3(d).

Claims (10)

1. the scafing device purging in front of a kind of continuous casting steel billet side is it is characterised in that include horizontal allotter（1）, vertical Allotter（2）, burner unit（3）With the pipeline that can be situated between, some burner units（3）By horizontal allotter（1）It is installed on roller-way Side, lower section, some burner units（3）By vertical divider（2）It is installed to roller-way both sides, each burner unit（3）Simultaneously to even Cast panel base（4）Upper surface, lower surface and two sides carry out scafing, two neighboring burner unit（3）It is located by connecting, peace Be attached to above roller-way, each burner unit of lower section（3）Respectively from the horizontal by angle of inclination, it is installed to each of roller-way both sides Individual burner unit（3）Respectively with a vertical angle of inclination, make combustion flame forwards and side purging, respectively can be situated between pipeline with Horizontal allotter（1）, vertical divider（2）Connect, the high-temperature slag producing during scafing passes through horizontal flushing cinder hydraulic giant （16）, vertical flushing cinder hydraulic giant（17）Wash away.

2. in front of continuous casting steel billet side according to claim 1 the scafing device of purging it is characterised in that described burner Unit（3）, including：Burner main body（18）, upper mass（19）, bottom piece（20）With boots block（21）；

Burner main body（18）There are four rows being arranged in parallel can be situated between passage, including preheated oxygen passage（22）, preheated fuel gas passage （23）, cleaning oxygen channel（24）, cleaning blast tube（25）, can the be situated between entrance of passage of each row is arranged on burner main body（18）'s Same surface, often arranges the passage that can be situated between and comprises 9 autonomous channels, the passage that can be situated between is formed around four passages, respectively upper water inlet is led to Road（26）, upper water-out passage（27）, side intake tunnel（28）, side exhalant canal（29）；

Burner main body（18）With horizontal allotter（1）Or vertical divider（2）It is connected, upper mass（19）, bottom piece（20）、 Boots block（21）All with burner main body（18）Fixing, upper mass（19）, bottom piece（20）With continuous casting steel billet（4）Become angle of inclination phase With；

Boots block（21）In continuous casting steel billet（4）Direct and continuous casting steel billet in transportation（4）Contact, boots block bottom is provided with high temperature resistant Pad（42）；

Upper mass（19）, bottom piece（20）Between formed slit be cleaning oxygen channel（24）Outlet, leads near cleaning oxygen Road（24）Exit is provided with oxygen barrier（36）, oxygen barrier（36）Two ends are respectively by barrier plug（38）Sealing, one clears reason Oxygen channel（24）In the oxygen of each autonomous channel flow through oxygen barrier（36）Post blend forms lamellar oxygen jet together, Through clearing up oxygen channel（24）Outlet is discharged；

Cleaning blast tube（25）Pass to bottom piece（20）Internal and in bottom piece（20）Surface forms cleaning blast tube（25） Outlet, near cleaning blast tube（25）Exit is provided with combustion gas barrier（37）, combustion gas barrier（37）Two ends are respectively by barrier Plug（38）Sealing, clears up blast tube（25）In each autonomous channel be divided into 5 passage aisles mutually not blended again, form 45 Gas nozzle outlet is as cleaning blast tube（25）Outlet；

Preheated oxygen passage（22）, preheated fuel gas passage（23）Pass to upper mass respectively（19）Internal and in upper mass（19）Surface Form preheated oxygen passage respectively（22）Outlet, preheated fuel gas passage（23）Outlet, near preheated oxygen passage（22）Outlet or Preheated fuel gas passage（23）Exit is provided with oxygen barrier（36）Or combustion gas barrier（37）, preheated oxygen passage（22）Or preheating Blast tube（23）In each autonomous channel be divided into 5 passage aisles mutually not blended again, formed 45 oxygen jets outlets or Gas nozzle exports, as preheated oxygen passage（22）Outlet or preheated fuel gas passage（23）Outlet.

3. the scafing device purging in front of continuous casting steel billet side according to claim 1 is it is characterised in that described can be situated between Pipeline includes：Preheated oxygen pipeline（5）, preheated fuel gas pipeline（6）, cleaning oxygen pipeline（7）, cleaning fuel gas pipeline（8）.

4. in front of continuous casting steel billet side according to claim 1 the scafing device of purging it is characterised in that described inclination Angle is between 5 ~ 15 °.

5. the scafing device purging in front of continuous casting steel billet side according to claim 1 is it is characterised in that this device sets Put two jacket water loops, including upper water inlet pipe（11）With upper water-out pipe（12）First chilled(cooling) water return (CWR) of formation, side water inlet pipe （13）With side outlet pipe（14）The second chilled(cooling) water return (CWR) being formed；

Cooling water is by upper water inlet pipe（11）Enter horizontal allotter（1）Or vertical divider（2）, then flow into each burner unit （3）Burner main body（18）, bottom piece（20）With boots block（21）, finally by upper water-out pipe（12）Flow out, form the first cooling water Loop；Boots block（21）Directly and continuous casting steel billet（4）Contact, cooling-water duct insertion whole boots block（21）, by water plug（39）Enter Row sealing；

Cooling water is by side water inlet pipe（13）Enter horizontal allotter（1）Or vertical divider（2）, then flow into each burner unit （3）Burner main body（18）And upper mass（19）, finally by side outlet pipe（14）Flow out, form the second chilled(cooling) water return (CWR).

6. in front of continuous casting steel billet side according to claim 2 the scafing device of purging it is characterised in that described cleaning Blast tube（25）Jet expansion, preheated fuel gas passage（23）Jet expansion, preheated oxygen passage（22）The nozzle of jet expansion All insert interchangeable core pipe（40）.

7. in front of continuous casting steel billet side according to claim 1 the scafing device of purging it is characterised in that described level Allotter（1）, vertical divider（2）With burner unit（3）Connection, and burner unit（3）Each part between connection By sealing ring（41）Sealing.

8. a kind of scafing side carrying out purging in front of continuous casting steel billet side using the scafing device described in claim 1 Method is it is characterised in that include：

（A）, the heat preheating continuous casting steel billet end initiation region that produced using combustion gas and oxygen combustion, until formation is initially melted Pond, completes continuous casting steel billet preheating；

（B）, purge initial molten bath using high pressure oxygen, continuous casting steel billet and scafing device start relative motion；

（C）High pressure oxygen and continuous casting steel billet occur violent oxidation reaction to make the diffusion of initial molten bath, the relative motion of continuous casting steel billet Advance initial molten bath to cover whole slab surface, using high pressure washing slag water, the slag of generation is washed away, to continuous casting plate simultaneously The defect on base surface carries out cleaning and removes.

9. method according to claim 8 is it is characterised in that described step（A）Including：

（a）, utilize horizontal allotter（1）, vertical divider（2）, burner unit（3）Clamping continuous casting steel billet（4）Complete ring fixed Position；

（b）, horizontal flushing cinder hydraulic giant（16）With vertical flushing cinder hydraulic giant（17）Be aligned continuous casting steel billet（4）Marginal position, treats burner unit （3）Touch continuous casting steel billet（4）After lift, in floating state；

（c）, roller-way reversion start, continuous casting steel billet（4）Recall；

（d）, the high-temp combustion flame heating continuous casting plate that formed with combustion gas and oxygen（4）Base end initiation region, after reaching fusing point Form initial molten bath.

10. method according to claim 8 is it is characterised in that described step（C）Including：

（a）, roller transport continuous casting steel billet（4）At the uniform velocity pass through scafing device, initial molten bath is spread and covered whole slab table The slag of generation is washed away using high pressure washing slag water by face simultaneously；

（b）, continuous casting steel billet（4）After leaving scafing device region, continuous casting steel billet（4）Warehouse-in.