CN117020192A - Method for testing heat load of bloom continuous casting machine - Google Patents
Method for testing heat load of bloom continuous casting machine Download PDFInfo
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- CN117020192A CN117020192A CN202311059861.2A CN202311059861A CN117020192A CN 117020192 A CN117020192 A CN 117020192A CN 202311059861 A CN202311059861 A CN 202311059861A CN 117020192 A CN117020192 A CN 117020192A
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- 238000012360 testing method Methods 0.000 title claims abstract description 133
- 238000009749 continuous casting Methods 0.000 title claims abstract description 130
- 238000000034 method Methods 0.000 title claims abstract description 29
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 99
- 239000010959 steel Substances 0.000 claims abstract description 99
- 238000005266 casting Methods 0.000 claims abstract description 53
- 238000005520 cutting process Methods 0.000 claims abstract description 21
- 238000001816 cooling Methods 0.000 claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000003860 storage Methods 0.000 claims abstract description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 18
- 229910052802 copper Inorganic materials 0.000 claims description 18
- 239000010949 copper Substances 0.000 claims description 18
- 239000000498 cooling water Substances 0.000 claims description 15
- 239000007788 liquid Substances 0.000 claims description 10
- 238000005070 sampling Methods 0.000 claims description 10
- 239000000178 monomer Substances 0.000 claims description 9
- 239000003795 chemical substances by application Substances 0.000 claims description 8
- 238000002360 preparation method Methods 0.000 claims description 6
- 238000013461 design Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 25
- 230000009286 beneficial effect Effects 0.000 abstract description 4
- 238000003303 reheating Methods 0.000 abstract 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 8
- 229910052760 oxygen Inorganic materials 0.000 description 8
- 239000001301 oxygen Substances 0.000 description 8
- 238000009529 body temperature measurement Methods 0.000 description 4
- 238000012790 confirmation Methods 0.000 description 4
- 238000004513 sizing Methods 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000011112 process operation Methods 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/12—Travelling ladles or similar containers; Cars for ladles
- B22D41/13—Ladle turrets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/053—Means for oscillating the moulds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/08—Accessories for starting the casting procedure
- B22D11/081—Starter bars
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
- B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/005—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like with heating or cooling means
- B22D41/01—Heating means
- B22D41/015—Heating means with external heating, i.e. the heat source not being a part of the ladle
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/12—Travelling ladles or similar containers; Cars for ladles
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
The invention relates to a method for testing a bloom continuous casting machine by using a heat load, belonging to the technical field of continuous casting machine production. The technical proposal is as follows: the bloom continuous casting machine comprises a ladle revolving table, a tundish and a tundish car, a tundish baking device, a crystallizer vibrating device, a fan-shaped section, secondary water system equipment, a flexible dummy bar and a storage device, a withdrawal straightening machine, a cutting car, a conveying roller way, a blank unloading roller way, a steel dragging machine and a stepping cooling bed, wherein the bloom continuous casting machine heat load test comprises a continuous casting machine cold test car, a continuous casting machine half-scale heat load test car and a continuous casting machine integral heat load test car, and the continuous casting machine half-scale heat load test car refers to a continuous casting machine heat load test car, namely a continuous casting machine odd-numbered stream is firstly subjected to heat test, and a reheating test casting machine even-numbered stream is subjected to heat test; the integral heat load test run of the continuous casting machine refers to the heat load test run of the continuous casting machine in which all flows are simultaneously involved. The beneficial effects of the invention are as follows: the success rate of the heat load test of the bloom continuous casting machine can be improved, various production accidents are stopped, and the heat load test cost is reduced.
Description
Technical Field
The invention relates to a method for testing heat load of a bloom continuous casting machine, belonging to the technical field of bloom continuous casting machine production in metallurgical industry.
Background
In the construction process of the bloom continuous casting machine, the bloom continuous casting machine heat load test has milestone significance, because the heat load test is carried out from the stand, approval, start-up, civil engineering, equipment installation and equipment debugging of the continuous casting machine, and if the heat load test is successful, the bloom continuous casting machine enters into the production test stage, so the bloom continuous casting machine heat load test is a key stage in the construction process. At present, the method for testing the heat load of the bloom continuous casting machine adopted by the steel mill mainly has the following problems:
(1) Many accidents of heat load test run equipment of bloom continuous casting machine
In the hot load test of the bloom continuous casting machine, the equipment accidents mainly exposed are mainly mechanical equipment, electric and hydraulic faults, so that the hot load test of the bloom continuous casting machine fails;
(2) Large square billet continuous casting machine heat load test run production accident and quality accident
In the process of heat load test run of the bloom continuous casting machine, production accidents often occur, so that production confusion is caused, production rhythm is influenced, and machine destruction and human death are caused in severe cases. Meanwhile, the casting blank has the quality problems of internal cracking, center segregation, center shrinkage cavity, air bubbles, layering and the like in the heat load production process. The production cost of the bloom continuous casting machine for heat load test run is greatly increased, and a large burden is brought to enterprises.
At present, the problem exists in the heat load test run process of the bloom continuous casting machine, the test production of the bloom continuous casting machine is restricted, the production and delivery cost of enterprises is increased, and the problem becomes the technical problem of enterprise development.
Disclosure of Invention
The invention aims to provide a method for testing the heat load of a bloom continuous casting machine, which can improve the success rate of the heat load test of the bloom continuous casting machine, stop various production accidents, reduce the cost of the heat load test and solve the problems in the background technology.
The technical scheme of the invention is as follows:
the large square billet continuous casting machine comprises a ladle turret, a tundish and a tundish car, a tundish baking device, a crystallizer vibrating device, a fan-shaped section, secondary cooling water system equipment, a flexible dummy bar and a storage device, a withdrawal and straightening machine, a cutting car, a conveying roller way, a blank unloading roller way, a steel dragging machine and a stepping cooling bed, wherein the large square billet continuous casting machine heat load test comprises a continuous casting machine cold test, a continuous casting machine half-scale heat load test and a continuous casting machine integral heat load test, and when the continuous casting machine half-scale heat load test is a continuous casting machine heat load test, the continuous casting machine odd number stream is firstly subjected to heat test, and the continuous casting machine even number stream is subjected to reheat test; the integral heat load test run of the continuous casting machine refers to the heat load test run of the continuous casting machine in which all flows are simultaneously involved.
The cold test run of the continuous casting machine is a preparation stage of the heat load test run of the continuous casting machine, and comprises the following steps:
step one: the ladle turret, the tundish car, the tundish baking device, the crystallizer vibrating device, the sector section, the secondary cooling water system equipment, the flexible dummy bar and the storage device, the withdrawal and straightening machine, the cutting car, the conveying roller way, the steel dragging machine and the stepping cooling bed are subjected to monomer test according to the design technical requirements;
step two: after the monomer test is completed, carrying out regional linkage test according to the regions to which the monomer test belongs;
step three: and after the regional linkage test is finished, carrying out linkage test on the whole bloom continuous casting machine.
The semi-scale heat load test run of the continuous casting machine, and the odd flow of the heat test continuous casting machine are controlled according to the following requirements:
(1) Confirming starting condition
After confirming that the starting technical parameters of the continuous casting machine are qualified, starting the continuous casting machine;
(2) Ladle operation
The ladle enters a pouring position, a ladle long nozzle is filled, and after a pouring start instruction is issued, a ladle operator opens a nozzle cylinder to perform full-flow pouring operation: when the molten steel in the tundish reaches 8-10 tons, adding a proper amount of tundish covering agent, wherein the condition that the molten steel is not exposed is taken as the condition; when reaching 15-20 tons, the ladle is slightly moved to drain so as to prevent the water port from being out of control, and the steel overflows from the tundish; measuring the temperature after casting the steel ladle for two minutes, and measuring the temperature once every 8 minutes; when the ladle is poured to 140-120 tons, sampling is started; after normal casting, the molten steel surface of the tundish is kept to 785-815mm;
(3) Tundish and crystallizer operation
After the ladle is poured, when the liquid level of the tundish reaches 300mm, pouring operation is carried out: after the full flow is opened for 2-3 seconds, the flow is collected by inching, whether a stopper rod is normal or not is checked, then the steel flow is controlled, the starting time is ensured to be 40-60 seconds, and when the surface of the molten steel of the crystallizer is 200mm away from the upper edge of a copper plate of the crystallizer, the pulling speed is started; when the molten steel surface of the crystallizer slowly rises to 80mm from the upper edge of the copper plate of the crystallizer, increasing the pulling speed at a constant speed, executing a pulling speed temperature matching system, and installing a submerged nozzle;
the even flow of the hot continuous caster is the same as the odd flow control of the hot continuous caster.
The whole heat load test run of the continuous casting machine is controlled according to the following requirements:
(1) Confirming starting condition
After confirming that all the starting technical parameters of the continuous casting machine are qualified, starting the continuous casting machine;
(2) Ladle operation
The ladle enters a pouring position, a ladle long nozzle is filled, and after a pouring start instruction is issued, a ladle operator opens a nozzle cylinder to perform full-flow pouring operation: when the molten steel in the tundish reaches 8-10 tons, adding a proper amount of tundish covering agent, wherein the condition that the molten steel is not exposed is taken as the condition; when reaching 15-20 tons, the ladle is slightly moved to drain so as to prevent the water port from being out of control, and the steel overflows from the tundish; measuring the temperature after casting the steel ladle for two minutes, and measuring the temperature once every 8 minutes; when the ladle is poured to 140-120 tons, sampling is started; after normal casting, the molten steel surface of the tundish is kept to be 785-815mm 800mm;
(3) Tundish and crystallizer operation
After the ladle is poured, when the liquid level of the tundish reaches 300mm, pouring operation is carried out: after the full flow is opened for 2-3 seconds, the flow is collected by inching, whether a stopper rod is normal or not is checked, then the steel flow is controlled, the starting time is ensured to be 40-60 seconds, and when the surface of the molten steel of the crystallizer is 200mm away from the upper edge of a copper plate of the crystallizer, the pulling speed is started; when the molten steel surface of the crystallizer slowly rises to 80mm from the upper edge of the copper plate of the crystallizer, the pulling speed is increased at a constant speed, a pulling speed temperature matching system is executed, and a submerged nozzle is arranged.
In the method for testing the heat load of the bloom continuous casting machine, in the step (3), when the molten steel surface of the crystallizer is 200mm away from the upper edge of the copper plate of the crystallizer, the pulling speed is 0.3m/min.
The beneficial effects of the invention are as follows:
(1) The invention adopts single body test, area linkage test, whole machine linkage test, team production exercise and half-scale heat load test modes of bloom continuous casting machine equipment, thereby exposing design defects and defects of the continuous casting machine in advance and adapting to bloom production. The problems are beneficial to early discovery and solution, and meanwhile, post operators are beneficial to being familiar with production equipment and operation processes in advance, so that a solid foundation is laid for successful one-time trial run of the heat load of the final bloom continuous casting machine;
(2) The semi-scale heat load test is a transition from cold test to heat test of continuous casting machine equipment, and in the multi-flow bloom continuous casting machine, the semi-scale heat load test is carried out by adopting flow separation, so that the problem in the heat test process can be conveniently and timely treated by using enough space, the success rate is improved, and the cost is reduced.
Detailed Description
The invention is further illustrated by the following examples.
The utility model provides a method of bloom conticaster heat load test run, bloom conticaster contains ladle revolving platform, middle package and middle package car, middle package baking equipment, crystallizer vibrating device, fan-shaped section, second cold water system equipment, flexible dummy bar and strorage device, draw leveler, cutting car, rollgang, unload the base roll table, drag for steel machine and step-by-step cooling bed, its characterized in that: the large billet continuous casting machine heat load test comprises a continuous casting machine cold test, a continuous casting machine half-scale heat load test and a continuous casting machine integral heat load test, wherein the continuous casting machine half-scale heat load test refers to that when the continuous casting machine heat load test is performed, the continuous casting machine odd-numbered flow is firstly performed, and the continuous casting machine even-numbered flow is reheated; the integral heat load test run of the continuous casting machine refers to the heat load test run of the continuous casting machine in which all flows are simultaneously involved.
The cold test run of the continuous casting machine is a preparation stage of the heat load test run of the continuous casting machine, and comprises the following steps:
step one: the ladle turret, the tundish car, the tundish baking device, the crystallizer vibrating device, the sector section, the secondary cooling water system equipment, the flexible dummy bar and the storage device, the withdrawal and straightening machine, the cutting car, the conveying roller way, the steel dragging machine and the stepping cooling bed are subjected to monomer test according to the design technical requirements;
step two: after the monomer test is completed, carrying out regional linkage test according to the regions to which the monomer test belongs;
step three: and after the regional linkage test is finished, carrying out linkage test on the whole bloom continuous casting machine.
The semi-scale heat load test run of the continuous casting machine, and the odd flow of the heat test continuous casting machine are controlled according to the following requirements:
(1) Confirming starting condition
After confirming that the starting technical parameters of the continuous casting machine are qualified, starting the continuous casting machine;
(2) Ladle operation
The ladle enters a pouring position, a ladle long nozzle is filled, and after a pouring start instruction is issued, a ladle operator opens a nozzle cylinder to perform full-flow pouring operation: when the molten steel in the tundish reaches 8-10 tons, adding a proper amount of tundish covering agent, wherein the condition that the molten steel is not exposed is taken as the condition; when reaching 15-20 tons, the ladle is slightly moved to drain so as to prevent the water port from being out of control, and the steel overflows from the tundish; measuring the temperature after casting the steel ladle for two minutes, and measuring the temperature once every 8 minutes; when the ladle is poured to 140-120 tons, sampling is started; after normal casting, the molten steel surface of the tundish is kept to 785-815mm;
(3) Tundish and crystallizer operation
After the ladle is poured, when the liquid level of the tundish reaches 300mm, pouring operation is carried out: after the full flow is opened for 2-3 seconds, the flow is collected by inching, whether a stopper rod is normal or not is checked, then the steel flow is controlled, the starting time is ensured to be 40-60 seconds, and when the surface of the molten steel of the crystallizer is 200mm away from the upper edge of a copper plate of the crystallizer, the pulling speed is started; when the molten steel surface of the crystallizer slowly rises to 80mm from the upper edge of the copper plate of the crystallizer, increasing the pulling speed at a constant speed, executing a pulling speed temperature matching system, and installing a submerged nozzle;
the even flow of the hot continuous caster is the same as the odd flow control of the hot continuous caster.
The whole heat load test run of the continuous casting machine is controlled according to the following requirements:
(1) Confirming starting condition
After confirming that all the starting technical parameters of the continuous casting machine are qualified, starting the continuous casting machine;
(2) Ladle operation
The ladle enters a pouring position, a ladle long nozzle is filled, and after a pouring start instruction is issued, a ladle operator opens a nozzle cylinder to perform full-flow pouring operation: when the molten steel in the tundish reaches 8-10 tons, adding a proper amount of tundish covering agent, wherein the condition that the molten steel is not exposed is taken as the condition; when reaching 15-20 tons, the ladle is slightly moved to drain so as to prevent the water port from being out of control, and the steel overflows from the tundish; measuring the temperature after casting the steel ladle for two minutes, and measuring the temperature once every 8 minutes; when the ladle is poured to 140-120 tons, sampling is started; after normal casting, the molten steel surface of the tundish is kept to 785-815mm;
(3) Tundish and crystallizer operation
After the ladle is poured, when the liquid level of the tundish reaches 300mm, pouring operation is carried out: after the full flow is opened for 2-3 seconds, the flow is collected by inching, whether a stopper rod is normal or not is checked, then the steel flow is controlled, the starting time is ensured to be 40-60 seconds, and when the surface of the molten steel of the crystallizer is 200mm away from the upper edge of a copper plate of the crystallizer, the pulling speed is started; when the molten steel surface of the crystallizer slowly rises to 80mm from the upper edge of the copper plate of the crystallizer, the pulling speed is increased at a constant speed, a pulling speed temperature matching system is executed, and a submerged nozzle is arranged.
In this embodiment, the continuous casting machine is a six-machine, six-strand bloom continuous casting machine.
Introduction of six-machine six-flow bloom continuous casting machine
The main equipment comprises: ladle turret, tundish and tundish car, tundish baking device, crystallizer vibrating device, sector section, secondary cooling water system equipment, flexible dummy bar and storage device, withdrawal and straightening machine, cutting car, conveying roller way, blank unloading roller way, steel-fishing machine, step cooling bed and other equipment, the equipment is equipped with 6 flows, nominal radius 12m,3 straightening points and flow spacing are 1600mm, can produce 200x280mm and 280x 280mm square billets, and is used for producing SBQ brand steel and structural steel.
The method for testing the heat load of the bloom continuous casting machine comprises the following steps:
the preparation steps are as follows:
1. after the bloom continuous casting machine is built, single test run is carried out on independent equipment such as a ladle turret, a tundish and a tundish car, a tundish baking device, a crystallizer vibrating device, a sector section, secondary cooling water system equipment, a flexible dummy bar and a storage device, a withdrawal and straightening machine, a cutting car, a conveying roller way, a steel fishing machine, a stepping cooling bed and the like according to design technical requirements, so that the finding problem is solved in time;
2. after each independent device performs single trial run, performing regional linkage trial run according to the region to which each independent device belongs; the method comprises the steps that linkage test is carried out on a blank ejection area consisting of a conveying roller way, a blank unloading roller way, a steel dragging machine and a stepping cooling bed, after the regional linkage test is finished, cold cast blanks can be hung on the conveying roller way of each flow, and test is carried out under the condition of simulating casting blank production; for example, the crystallizer vibrating device, the fan-shaped section, the secondary cooling water system equipment, the flexible dummy bar, the storage device and the pouring area of the drawing and straightening machine are subjected to linkage test, the area linkage test uses the dummy bar feeding and the casting starting operation as main projects to debug the actions of the equipment accurately in place, and the finding problem is solved in time;
3. after the linkage test run is carried out on the equipment in each area, the linkage test run of the whole bloom continuous casting machine is carried out, and the discovery problem is solved in time;
after the linkage test run of the bloom continuous casting machine is completed, delivering a production operation shift, and carrying out drill steel drawing (casting start, normal steel drawing production and casting stop) production by a production operation shift organization post operator according to a normal production mode, wherein each shift is no less than four times, and the problems found in the simulated production are summarized and solved each time;
half-scale thermal load test run step:
the bloom continuous casting machine is generally multi-machine multi-flow, and the half-scale bloom continuous casting machine heat load test refers to the heat test of one flow, three flows and five flows and then the test of two flows, four flows and six flows if the bloom continuous casting machine is six-machine six-flow. If the bloom continuous casting machine is five-machine five-flow, testing one flow, three flows and five flows firstly, and then testing two flows and four flows, so that half-scale test of the bloom continuous casting machine is actually a space flow for test;
1. confirmation of power-on condition
All post operators of the production group perform inspection and confirmation work before a half-scale bloom continuous casting machine thermal load test, find problems and report to a dispatching in time, and start up can be performed after all starting technical parameters are confirmed to be qualified;
when the ladle is lifted from the refining furnace, notifying each post by the work length, preparing to start up, and confirming the steel grade and each parameter of the computer system of the main control room;
2. ladle operation step
The ladle enters a steel pouring position and is filled into a ladle long nozzle; the method comprises the steps of confirming that a middle ladle system is ready, and waiting for a casting instruction; after the pouring start instruction is issued, a ladle operator opens a water gap cylinder to perform full-flow pouring operation: when the molten steel in the tundish reaches 8-10 tons, adding a proper amount of tundish covering agent to ensure that the molten steel is not exposed; when reaching 15-20 tons, the ladle is slightly moved to drain so as to prevent the water port from being out of control, and the steel overflows from the tundish; after the ladle is poured for 2 minutes, temperature measurement is carried out in time, and then the temperature measurement is carried out once every 8 minutes; sampling is started when the steel ladle is poured to 140-120 tons, and sampling is carried out in time; after normal casting, the molten steel surface of the tundish is kept about 800mm;
3. tundish and crystallizer operation steps
After the ladle is opened, when the liquid level of the tundish reaches 300mm, the ladle is opened according to the working length instruction: after the full flow is opened for 2-3 seconds, the flow is collected by inching, whether a stopper rod is good or not is checked, then the steel flow is controlled, the starting time is ensured to be 40-60 seconds, and when the molten steel surface of the crystallizer is 200mm away from the upper edge of a copper plate of the crystallizer, the starting pulling speed is 0.3m/min; when the molten steel surface of the crystallizer slowly rises to 80mm from the upper edge of the copper plate of the crystallizer, increasing the pulling speed at a constant speed and installing a submerged nozzle; after each flow is started normally, the pulling speed is uniformly commanded by the work length and the machine length, so that the ingot stripping operation is facilitated; when the ingot is removed, the machine staff pay close attention to the ingot removing condition and command the steel pouring worker to carry out expansion, descent and pulling according to the actual condition; after ingot stripping, the pulling speed is matched according to the temperature and rises to a normal value; the process operation is carried out, a pull speed temperature matching system is strictly executed, and the stability of the liquid level of the crystallizer is closely concerned;
in the process of casting steel, monitoring the pressure and flow of cooling water and secondary cooling water of a crystallizer in a main control room and drawing speed pictures; immediately judging when an alarm appears, informing related personnel to timely process or stop pouring, immediately closing secondary cooling water when the pouring is stopped suddenly, and starting and then starting;
4. cutting operation procedure
The casting blank enters a cutting area, whether the casting blank catches fire or not is concerned, otherwise, a fine oxygen pipe can be used for carrying out combustion supporting operation; the length of the head blank uniformly executes the technical file requirements; the cutter closely pays attention to the running condition of the casting blank, finds that the casting blank which is not cut off is cut off by an accident cutting gun in time, and reports the condition to the operator; and (5) performing optimized sizing operation.
When the cutting gun cuts the casting blank, the cutting flame is generally burnt to a point of direct burning melting on the side edge of the casting blank, so that the casting blank can be cut off under the action of cutting oxygen, if the casting blank does not burn out the melted point, the cutting oxygen can not cut off the casting blank, a thin oxygen pipe is adopted to be placed on the side of the casting blank for continuous casting, the thin oxygen pipe is easy to melt under the action of the cutting oxygen due to small sectional area, the melt is adhered to the casting blank, the casting blank is cut off immediately under the action of the cutting oxygen, and finally the casting blank is cut off.
5. Step of knockout operation
The continuous casting blank enters a blank discharging roller way from a conveying roller way, the casting blank is stopped, a blank in-place signal is sent, and a steel dragging machine conveys the continuous casting blank to a stepping cooling bed; if invalid, a manual button is started, and the steel scooping machine is manually operated until the flow is manually removed; the casting blank enters a stepping cooling bed and then steadily passes through the stepping cooling bed to reach a casting blank collecting bench; if not, notifying the station lower group length, and organizing the single casting blank clamp lower continuous casting blank; and 4 casting blanks reach the casting blank collecting rack in a group, and the rotating clamp is commanded to hang off the continuous casting blanks.
6. Shutdown operation step
Picking up a long nozzle when the residual molten steel of the ladle is about 3 tons; and after the steel ladle is poured, rotating the steel ladle to a preparation position, picking up a water gap cylinder, and commanding the crown block to hoist the steel ladle. When pouring the middle ladle to 20t, starting tail blank optimizing sizing operation, and stopping pouring successively according to tail blank conditions; after all flows are stopped, starting a tundish car to start to a baking position, and after the last continuous casting blank is discharged from a withdrawal and straightening machine, closing secondary cooling water, and stopping withdrawal and straightening equipment, vibration equipment and the like; and stopping all continuous casting machine equipment after all tail blanks are discharged.
The other half-scale bloom continuous casting machine heat load test run is actually the test run without the flow of the heat load test run in the steps, and the heat load test run steps and the content are the same as those of the half-scale bloom continuous casting machine heat load test run.
Heat load test run step for bloom continuous casting machine
The bloom caster heat load test run is a heat load test run in which all flows of the bloom caster are taken into account at the same time.
1. Confirmation of power-on condition
All post operators of the production group perform inspection and confirmation work before a half-scale bloom continuous casting machine thermal load test, find problems and report to a dispatching in time, and start up can be performed after all starting technical parameters are confirmed to be qualified;
when the ladle is lifted from the refining furnace, notifying each post by the work length, preparing to start up, and confirming the steel grade and each parameter of the computer system of the main control room;
2. ladle operation step
The ladle enters a steel pouring position and is filled into a ladle long nozzle; the method comprises the steps of confirming that a middle ladle system is ready, and waiting for a casting instruction; after the pouring start instruction is issued, a ladle operator opens a water gap cylinder to perform full-flow pouring operation: when the molten steel in the tundish reaches 8-10 tons, adding a proper amount of tundish covering agent to ensure that the molten steel is not exposed; when reaching 15-20 tons, the ladle is slightly moved to drain so as to prevent the water port from being out of control, and the steel overflows from the tundish; after the ladle is poured for 2 minutes, temperature measurement is carried out in time, and then the temperature measurement is carried out once every 8 minutes; sampling is started when the steel ladle is poured to 140-120 tons, and sampling is carried out in time; after normal casting, the molten steel surface of the tundish is kept about 800mm;
3. tundish and crystallizer operation steps
After the ladle is opened, when the liquid level of the tundish reaches 300mm, the ladle is opened according to the working length instruction: after the full flow is opened for 2-3 seconds, the flow is collected by inching, whether a stopper rod is good or not is checked, then the steel flow is controlled, the starting time is ensured to be 40-60 seconds, and when the molten steel surface of the crystallizer is 200mm away from the upper edge of a copper plate of the crystallizer, the starting pulling speed is 0.3m/min; when the molten steel surface of the crystallizer slowly rises to 80mm from the upper edge of the copper plate of the crystallizer, increasing the pulling speed at a constant speed and installing a submerged nozzle; after each flow is started normally, the pulling speed is uniformly commanded by the work length and the machine length, so that the ingot stripping operation is facilitated; when the ingot is removed, the machine staff pay close attention to the ingot removing condition and command the steel pouring worker to carry out expansion, descent and pulling according to the actual condition; after ingot stripping, the pulling speed is matched according to the temperature and rises to a normal value; the process operation is carried out, a pull speed temperature matching system is strictly executed, and the stability of the liquid level of the crystallizer is closely concerned;
in the process of casting steel, monitoring the pressure and flow of cooling water and secondary cooling water of a crystallizer in a main control room and drawing speed pictures; immediately judging when an alarm appears, informing related personnel to timely process or stop pouring, immediately closing secondary cooling water when the pouring is stopped suddenly, and starting and then starting;
4. cutting operation procedure
The casting blank enters a cutting area, whether the casting blank catches fire or not is concerned, otherwise, a fine oxygen pipe can be used for carrying out combustion supporting operation; the length of the head blank uniformly executes the technical file requirements; the cutter closely pays attention to the running condition of the casting blank, finds that the casting blank which is not cut off is cut off by an accident cutting gun in time, and reports the condition to the operator; and (5) performing optimized sizing operation.
5. Step of knockout operation
The continuous casting blank enters a blank discharging roller way from a conveying roller way, the casting blank is stopped, a blank in-place signal is sent, and a steel dragging machine conveys the continuous casting blank to a stepping cooling bed; if invalid, a manual button is started, and the steel scooping machine is manually operated until the flow is manually removed; the casting blank enters a stepping cooling bed and then steadily passes through the stepping cooling bed to reach a casting blank collecting bench; if not, notifying the station lower group length, and organizing the single casting blank clamp lower continuous casting blank; and 4 casting blanks reach the casting blank collecting rack in a group, and the rotating clamp is commanded to hang off the continuous casting blanks.
6. Shutdown operation step
Picking up a long nozzle when the residual molten steel of the ladle is about 3 tons; and after the steel ladle is poured, rotating the steel ladle to a preparation position, picking up a water gap cylinder, and commanding the crown block to hoist the steel ladle. When pouring the middle ladle to 20t, starting tail blank optimizing sizing operation, and stopping pouring successively according to tail blank conditions; after all flows are stopped, starting a tundish car to start to a baking position, and after the last continuous casting blank is discharged from a withdrawal and straightening machine, closing secondary cooling water, and stopping withdrawal and straightening equipment, vibration equipment and the like; and stopping all continuous casting machine equipment after all tail blanks are discharged.
Claims (5)
1. The utility model provides a method of bloom conticaster heat load test run, bloom conticaster contains ladle revolving platform, middle package and middle package car, middle package baking equipment, crystallizer vibrating device, fan-shaped section, second cold water system equipment, flexible dummy bar and strorage device, draw leveler, cutting car, rollgang, unload the base roll table, drag for steel machine and step-by-step cooling bed, its characterized in that: the large billet continuous casting machine heat load test comprises a continuous casting machine cold test, a continuous casting machine half-scale heat load test and a continuous casting machine integral heat load test, wherein the continuous casting machine half-scale heat load test refers to that when the continuous casting machine heat load test is performed, the continuous casting machine odd-numbered flow is firstly performed, and the continuous casting machine even-numbered flow is reheated; the integral heat load test run of the continuous casting machine refers to the heat load test run of the continuous casting machine in which all flows are simultaneously involved.
2. A method of hot load commissioning of a bloom continuous caster as claimed in claim 1, wherein: the cold test run of the continuous casting machine is a preparation stage of the heat load test run of the continuous casting machine, and comprises the following steps:
step one: the ladle turret, the tundish car, the tundish baking device, the crystallizer vibrating device, the sector section, the secondary cooling water system equipment, the flexible dummy bar and the storage device, the withdrawal and straightening machine, the cutting car, the conveying roller way, the steel dragging machine and the stepping cooling bed are subjected to monomer test according to the design technical requirements;
step two: after the monomer test is completed, carrying out regional linkage test according to the regions to which the monomer test belongs;
step three: and after the regional linkage test is finished, carrying out linkage test on the whole bloom continuous casting machine.
3. A method of hot load commissioning of a bloom continuous caster as claimed in claim 1, wherein: the semi-scale heat load test run of the continuous casting machine, and the odd flow of the heat test continuous casting machine are controlled according to the following requirements:
(1) Confirming starting condition
After confirming that the starting technical parameters of the continuous casting machine are qualified, starting the continuous casting machine;
(2) Ladle operation
The ladle enters a pouring position, a ladle long nozzle is filled, and after a pouring start instruction is issued, a ladle operator opens a nozzle cylinder to perform full-flow pouring operation: when the molten steel in the tundish reaches 8-10 tons, adding a proper amount of tundish covering agent, wherein the condition that the molten steel is not exposed is taken as the condition; when reaching 15-20 tons, the ladle is slightly moved to drain so as to prevent the water port from being out of control, and the steel overflows from the tundish; measuring the temperature after casting the steel ladle for two minutes, and measuring the temperature once every 8 minutes; when the ladle is poured to 140-120 tons, sampling is started; after normal casting, the molten steel surface of the tundish is kept to 785-815mm;
(3) Tundish and crystallizer operation
After the ladle is poured, when the liquid level of the tundish reaches 300mm, pouring operation is carried out: after the full flow is opened for 2-3 seconds, the flow is collected by inching, whether a stopper rod is normal or not is checked, then the steel flow is controlled, the starting time is ensured to be 40-60 seconds, and when the surface of the molten steel of the crystallizer is 200mm away from the upper edge of a copper plate of the crystallizer, the pulling speed is started; when the molten steel surface of the crystallizer slowly rises to 80mm from the upper edge of the copper plate of the crystallizer, increasing the pulling speed at a constant speed, executing a pulling speed temperature matching system, and installing a submerged nozzle;
the even flow of the hot continuous caster is the same as the odd flow control of the hot continuous caster.
4. A method of hot load commissioning of a bloom continuous caster as claimed in claim 1, wherein: the whole heat load test run of the continuous casting machine is controlled according to the following requirements:
(1) Confirming starting condition
After confirming that all the starting technical parameters of the continuous casting machine are qualified, starting the continuous casting machine;
(2) Ladle operation
The ladle enters a pouring position, a ladle long nozzle is filled, and after a pouring start instruction is issued, a ladle operator opens a nozzle cylinder to perform full-flow pouring operation: when the molten steel in the tundish reaches 8-10 tons, adding a proper amount of tundish covering agent, wherein the condition that the molten steel is not exposed is taken as the condition; when reaching 15-20 tons, the ladle is slightly moved to drain so as to prevent the water port from being out of control, and the steel overflows from the tundish; measuring the temperature after casting the steel ladle for two minutes, and measuring the temperature once every 8 minutes; when the ladle is poured to 140-120 tons, sampling is started; after normal casting, the molten steel surface of the tundish is kept to 785-815mm;
(3) Tundish and crystallizer operation
After the ladle is poured, when the liquid level of the tundish reaches 300mm, pouring operation is carried out: after the full flow is opened for 2-3 seconds, the flow is collected by inching, whether a stopper rod is normal or not is checked, then the steel flow is controlled, the starting time is ensured to be 40-60 seconds, and when the surface of the molten steel of the crystallizer is 200mm away from the upper edge of a copper plate of the crystallizer, the pulling speed is started; when the molten steel surface of the crystallizer slowly rises to 80mm from the upper edge of the copper plate of the crystallizer, the pulling speed is increased at a constant speed, a pulling speed temperature matching system is executed, and a submerged nozzle is arranged.
5. A method of hot load commissioning of a bloom continuous caster as claimed in claim 3 or 4, wherein: in the step (3), when the molten steel surface of the crystallizer is 200mm away from the upper edge of the copper plate of the crystallizer, the pulling speed is 0.3m/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311059861.2A CN117020192A (en) | 2023-08-22 | 2023-08-22 | Method for testing heat load of bloom continuous casting machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311059861.2A CN117020192A (en) | 2023-08-22 | 2023-08-22 | Method for testing heat load of bloom continuous casting machine |
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