CN104525885B - A kind of strong cold water spray system of cast steel and strong refrigerating technology - Google Patents
A kind of strong cold water spray system of cast steel and strong refrigerating technology Download PDFInfo
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- CN104525885B CN104525885B CN201410849050.7A CN201410849050A CN104525885B CN 104525885 B CN104525885 B CN 104525885B CN 201410849050 A CN201410849050 A CN 201410849050A CN 104525885 B CN104525885 B CN 104525885B
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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
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
- B22D11/1246—Nozzles; Spray heads
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Abstract
The present invention provides a kind of strong cold water spray system of strand, and it includes, and for water-pressurization system (1), is arranged near continuous casting machine, in order to being water under high pressure by low setting-out supercharging; Runoff investigation system (2), in order to calculate slab cooling to the water yield required for target temperature, and exports required water spray; Decompression protection system (3), when the pump intake pressure of booster pump exceedes a certain setting value, carries out drainage and step-down; Spray system (4), includes the high pressure nozzle (41) being evenly arranged, and it is by the surface of abundant for high-pressure cooling water atomized spray to strand; Strand temperature control system (5), utilizes computer-controlled model, calculates the temperature field of strand. The strong cooling system of strand of the present invention is simple, and strong refrigerating technology is workable, it is easy to implement. This process can solve the outside chink of strand well simultaneously, it is ensured that the metal contracts rate of strand, and decreases the workload of strand reconditioning, thus good economic benefit can be produced.
Description
Technical field
The present invention relates to a kind of strand strong cold water spray system for metallurgy industry continuous casting steel machine rolling field and the strong refrigerating technology corresponding with this strong cold water spray system.
Background technology
In metallurgical industry, the employing continuous casting technique of vast scale makes molten steel shape, and namely molten steel is constantly cooled to the strand of certain cross dimension through crystallizer. Specifically, when producing strand, liquid steel water injects crystallizer continuously from crystallizer top, after the effect such as crystallized device cooled and solidified, the internal casting blank shell for liquid molten steel is formed in crystallizer internal cavity bottom, under the dragging effect of the drawing straightener being arranged below at crystallizer, strand is along crystallizer output continuously from top to bottom.
The vanguard technology of existing continuous casting steel machine is to be arranged around one or several milling trains in the drawing straightener, the internal soundness of strand is changed in the way of changing strand transverse section, the process of implementing is: strand is after Mould and Secondary Cooling district cools down, form certain thickness or the high temperature strand solidified completely, high temperature strand is by after mill milling, and thickness reduces to a certain degree and solves the quality problems at strand center.
Although current strand internal soundness after mill milling is good, internal indices performance is higher than the strand without high temperature rolling, but strand occurs in that corner crack after rolling, to be continuing with in later procedure, diagonal section must carry out reconditioning, removing substantial amounts of corner crack region, this just directly results in the reduction of recovery rate of iron and production efficiency and the rising of running cost.
The reason that strand corner crack occurs is: strand is after general again specific type of cooling cooling this by Mould and Secondary Cooling district, and the temperature on transverse section exists central temperature more than edge temperature, edge temperature more than the situation of corner temperature. Strand is near the milling train position arranged, in most cases, likely the temperature in corner can between 700～900 degree, and in this temperature range, strand is risen again on secondary cooling zone sub-cooled and surface the precipitation capacity that reheat vapor cycle can increase ALN the reduction causing steel moulding.It is to say, be not suitable for strand is changed the operation of shape in this case.
Summary of the invention
It is an object of the invention to provide the strong cold water spray system before the rolling of a kind of continuous casting steel machine and the strong cooling method corresponding with this spray system, by the water-spraying control of high intensity so that strand corner temperature before entering milling train is reduced to less than 700 degree (concrete technology parameter needs to formulate) according to conditions such as strand steel grade, strand transverse section, roll reduction thus solving the problem that rolling forward corner is in brittle zone.
To achieve these goals, strong cold water spray system of the present invention, it includes,
For water-pressurization system, it is arranged near continuous casting machine, and the low setting-out in order to be provided in workshop is pressurized to required pressure of supply water value;
Runoff investigation system, in order to calculate slab cooling to the water yield required for target temperature, regulates the final size controlling the water yield and the required water spray of output simultaneously by PID;
Decompression protection system, in order to when the pump intake pressure of booster pump exceedes a certain setting value, to carry out draining until the pump intake pressure of booster pump is less than a certain setting value;
Spray system, includes the high pressure nozzle being evenly arranged according to the shape of strand, and strand to the surface of strand, is uniformly cooled down by it by abundant for high-pressure cooling water atomized spray;
Strand temperature control system, utilizes computer-controlled model, accurately calculates the temperature field of strand.
Further, including hand off valve, booster pump and check-valves for water-pressurization system, described stop valve is arranged at the side of the close feed pipe of booster pump, and described check-valves is arranged at the side that booster pump is connected with runoff investigation system.
Further, the pressure of supply water of continuous casting workshop 0.4～1.0MPa is pressurized to final pressure 1.8～2.5MPa by described confession water-pressurization system.
Further, described runoff investigation system includes hand off valve, effusion meter, automatic regulating valve and distance-transmission pressure gauge, described effusion meter and automatic regulating valve and forms closed-loop control system, and automatic regulating valve quickly responds the water yield value that output requires.
Described decompression protection system includes hand off valve, distance-transmission pressure gauge, automatic decompression valve; The pressure of described distance-transmission pressure gauge monitoring booster pump outfan.
Further, the plurality of high pressure nozzle is installed in thermal insulation cover; Described thermal insulation cover is fixed in roller bed frame by the mode of bearing pin voussoir.
Further, the flow of the high pressure nozzle of described strong cold water spray system is 6～15ml/min, has 4～10 row's nozzles, and the nozzle form of front 2～5 rows is flat burner, and the nozzle form of rear 2～8 rows is full cone or elliptical nozzles.
Further, described strand temperature control system includes calculation model for temperature field computer, in order to accurately to calculate the temperature field of target strand, described effusion meter is in order to feed back actually used cooling water inflow to computer, Computer calculates temperature field, then control to require to revise whole temperature field according to process, to water yield required value.
The present invention also provides for a kind of and above-mentioned strand strong refrigerating technology corresponding for the strong cold water spray system of the strand before continuous casting steel machine rolling process, and concrete technology method is as follows:
Step one: calculate temperature field, strand transverse section, it is determined that strong cold institute water requirement;
Step 2: the low setting-out that workshop provides is pressurized to the water under high pressure of desirable pressure;
Step 3: carry out water rate control by regulating valve and effusion meter, to export required injection flow rate;
Step 4: atomization cooling water, sprays to strand with cooling and purging strand.
Further, after the low setting-out supercharging that workshop is provided, when the pressure of supercharging delivery side of pump is more than a particular value, automatic decompression valve is opened and is reduced to a setting value, be then shut off automatic decompression valve.
The strong cooling system of strand of the present invention is simple, and strong refrigerating technology is workable, it is easy to implement. This process can solve the outside chink of strand well simultaneously, it is ensured that the metal contracts rate of strand, and decreases the workload of strand reconditioning, thus good economic benefit can be produced.
Accompanying drawing explanation
Fig. 1 is the strong cold water spray system schematic that the strong cold technical process before continuous casting steel machine of the present invention rolling uses.
Fig. 2 is the installation diagram of the thermal insulation cover of strong cold water spray system described in Fig. 1 and roller-way.
Fig. 3 is arrangement of nozzles Fig. 1 of strong cold water spray system described in Fig. 1.
Fig. 4 is the section A-A schematic diagram of arrangement of nozzles Fig. 1 of strong cold water spray system described in Fig. 3.
Detailed description of the invention
In order to be better understood from the purpose of the present invention and construction features, below in conjunction with its accompanying drawing, actual condition, structure and work process to the specific embodiment of the invention are described in detail.
Fig. 1 is the strong cold water spray system schematic that the strong cold technical process before continuous casting steel machine of the present invention rolling uses. As it is shown in figure 1, this strong cold water spray system includes for water-pressurization system 1, runoff investigation system 2, decompression protection system 3, spray system 4 and strand temperature control system.
Described confession water-pressurization system 1, is arranged near continuous casting machine, is pressurized to required pressure of supply water value with the low setting-out realized to workshop provides. Described confession water-pressurization system includes hand off valve 11, booster pump 12 and check-valves 13, and described stop valve 11 is arranged at the side of the close feed pipe of booster pump, and described check-valves 13 is arranged at the side that booster pump is connected with runoff investigation system. Generally, the pressure of supply water of continuous casting workshop is 0.4～1.0MPa, and the water system final pressure of this process calls is 1.8～2.5MPa, by arranging thus realizing low setting-out supercharging is the water under high pressure with desirable pressure value for water-pressurization system.
Described runoff investigation system 2 includes hand off valve 21, effusion meter 22, automatic regulating valve 23 and distance-transmission pressure gauge 24. According to calculation model for temperature field, calculated by computer 51 and strand 42 is cooled to the water yield needed for target temperature, water yield required value is issued effusion meter 22 and closed-loop control system that automatic regulating valve 23 is formed carries out PID adjustment, finally quickly responded the water yield value that output requires by automatic regulating valve 23.
Described decompression protection system includes hand off valve 31, distance-transmission pressure gauge 32, automatic decompression valve 33. Be monitored the pressure of booster pump 12 outfan by distance-transmission pressure gauge 32, when pressure exceedes a certain setting value, automatic decompression valve 33 is opened the several seconds and is carried out draining, and during less than a certain setting value, automatic decompression valve 33 is closed.
Described spray system includes high pressure nozzle 41, strand 42 and roller-way 43. As in figure 2 it is shown, described high pressure nozzle 41 is uniformly arranged on the spray header being fixed in thermal insulation cover 6, described thermal insulation cover 6 is to be fixed in roller bed frame 7 in the way of bearing pin voussoir. The effect of protective cover is: after making slab cooling, can guarantee that the steam of cooling water heat evaporation can be efficiently collected in two cold houses while surface temperature homogenization. As shown in Figures 3 and 4, the thermal insulation cover of strand 42 periphery before casting is provided with 4～10 row's nozzles, the nozzle form of front 2～5 rows is flat burner, the nozzle form of rear 2～8 rows is full cone or elliptical nozzles, wherein often row's nozzle is 3～12, the operating pressure of described high pressure nozzle 41 is 1.8～2.5MPa, and the flow of each high pressure nozzle 41 is 6～15ml/min.High pressure nozzle 41 is to be evenly arranged according to the transverse section of strand, and difform strand high pressure nozzle arrangement form is different. High-pressure cooling water is fully atomized under the effect of high pressure nozzle, spray the surface to strand 42, strand is cooled down uniformly, pressure owing to supplying water is pressurizeed by pressure charging system 1, so cooling water injection is very fast to the speed on the surface of strand 42, it is possible to play the effect purging strand 42 surface scale.
Described strand temperature control system 5 include calculation model for temperature field computer 51, effusion meter 22 feedback data and calculate object strand 42. This system is to utilize computer-controlled model, accurately calculates the temperature field of strand. By effusion meter 22 feedback data and actually used cooling water inflow to computer model, computer 51 calculates actual temperature field, then process according to the invention method controls to require to revise further whole temperature field, to water yield required value, and when actual creation data changes, models for temperature field calculates water yield required value in time. Meanwhile, this system possesses historical data and preserves function in real time, in order to follow-up improvement and research use.
Have selected automatic runoff investigation system in the enforcement of the present invention, the effusion meter of teletransmission as shown in Figure 1 and regulate valve automatically, both form closed-loop control system, are regulated by PID, can the water yield needed for quick response system. And can remotely control in real time, it is provided that monitoring, the man machine operation interface of operation, save historical data in real time for analysis and research.
Strong refrigerating technology before continuous casting steel machine of the present invention rolling is realized by the above-mentioned strong cooling system of strand. Specifically, described for water-pressurization system 1 in order to low setting-out to be pressurized to supply subsequent technique after required pressure; The water spray water yield of the described runoff investigation system 2 required target temperature in order to calculate according to strand temperature control system, carries out the control of water yield size, the water spray water yield that output is required by adjustment valve and effusion meter; Described decompression protection system is in order to when booster pump outlet pressure increases to a certain degree, to carry out pressure release, to protect booster pump; When runoff investigation system fading margin, the size variation of the water yield causes the pressure of booster pump outlet to change; The Main Function of described spray system is: utilize nozzle to be atomized by cooling water, sprays to strand, plays cooling and the effect purged; The Main Function of described strand temperature control system is based on the feedback data input temp field computation model at scene, calculates strand temperature field in real time, according to the water spray water yield that surface temperature control output is required, and saves historical data in real time for analysis and research.
Above-mentioned strong refrigerating technology has the advantages that automaticity is high, in the casting process of strand, available Temperature Field Control model calculates the temperature field, strand transverse section before rolling, so that it is determined that go out the water yield forcing cooling to need, reach the purpose of given certain water yield by the valve that is automatically adjusted of cooling system; Monitoring, operation, debugging overall process provide man-machine interface picture, thus maintaining easily; Real-time online amendment technological parameter, saves historical data, in real time thus ensureing the steady quality of strand. This process can purge, when cooling down water pressurized spray, the iron scale disposing casting billet surface effectively, so that the cc billet surface quality after rolling is significantly high. This process effectively improves plasticity and the intensity in strand edge and corner, improves the internal soundness of strand simultaneously.This process improves the metal contracts rate of strand, and then also improves productivity effect. Formed the tiny equiaxed grain structure of low temperature by the cooling of high intensity, the edge of casting blank shell and corner, plasticity improves; By the cooling of high intensity, make strand when green shell is shunk, center is still high temperature strand or liquid molten steel, some casting blank defects (center porosity, central pipe) existed, being contracted in of green shell have compressed center strand or liquid molten steel to a certain extent, thus improving the internal soundness of strand; By the cooling of high intensity, a temperature transition district is there is between the center and green shell of strand, temperature range is between 700～900 degree, this temperature transition district forms a brittle layer, but the contraction due to casting blank shell, and there is certain plasticity and intensity, brittle layer is fettered so that described brittle layer is unlikely to brittle crack occur.
The above is only the strong cold technique of the present invention a kind of detailed description of the invention in continuous casting and rolling process; it should be pointed out that, for those skilled in the relevant art, under the premise without departing from the principles of the invention; the trickle modification made and improvement, also should be regarded as belonging to the protection domain of invention.
Claims (9)
1. the strong cold water spray system of strand: it is characterized in that, it includes,
For water-pressurization system (1), it is arranged near continuous casting machine, and the low setting-out in order to be provided in workshop is pressurized to required pressure of supply water value, and pressure of supply water value is 1.8～2.5MPa;
Runoff investigation system (2), in order to calculate slab cooling to the water yield required for target temperature, regulates the final size controlling the water yield and the required water spray of output simultaneously by PID;
Decompression protection system (3), in order to when the pump intake pressure of booster pump exceedes a certain setting value, to carry out draining until the pump intake pressure of booster pump is less than a certain setting value;
Spray system (4), includes the high pressure nozzle (41) being evenly arranged according to the shape of strand, and strand to the surface of strand, is uniformly cooled down by it by abundant for high-pressure cooling water atomized spray;
Strand temperature control system (5), utilizes computer-controlled model, accurately calculates the temperature field of strand.
2. the strong cold water spray system of strand as claimed in claim 1, it is characterized in that, hand off valve (11), booster pump (12) and check-valves (13) is included for water-pressurization system (1), described stop valve (11) is arranged at the side of the close feed pipe of booster pump, and described check-valves (13) is arranged at the side that booster pump is connected with runoff investigation system.
3. the strong cold water spray system of strand as claimed in claim 1, it is characterized in that, described runoff investigation system includes hand off valve (21), effusion meter (22), automatic regulating valve (23) and distance-transmission pressure gauge (24), described effusion meter (22) and automatic regulating valve (23) form closed-loop control system, and automatic regulating valve 23 quickly responds the water yield value that output requires.
4. the strong cold water spray system of strand as claimed in claim 1, it is characterised in that described decompression protection system (3) includes hand off valve (31), distance-transmission pressure gauge (32), automatic decompression valve (33); The pressure of described distance-transmission pressure gauge monitoring booster pump (12) outfan.
5. the strong cold water spray system of strand as claimed in claim 1, it is characterised in that described high pressure nozzle (41) is installed in thermal insulation cover; Described thermal insulation cover is fixed in roller bed frame by the mode of bearing pin voussoir.
6. the strong cold water spray system of strand as claimed in claim 5 in, it is characterized in that, the flow of the high pressure nozzle (41) of described strong cold water spray system is 6～15ml/min, have 4～10 row's nozzles, the nozzle form of front 2～5 rows is flat burner, and the nozzle form of rear 2～8 rows is full cone or elliptical nozzles.
7. the strong cold water spray system of strand as claimed in claim 3, it is characterized in that, described strand temperature control system (5) includes calculation model for temperature field computer (51), in order to accurately to calculate the temperature field of target strand, described effusion meter (22) is in order to feed back actually used cooling water inflow to computer (51), Computer calculates temperature field, then controls to require to revise whole temperature field according to process, to water yield required value.
8., for the strong refrigerating technology of strand before continuous casting steel machine rolling process, it corresponds to the strong cold water spray system of strand as claimed in claim 1, wherein:
Step one: calculate temperature field, strand transverse section, it is determined that strong cold institute water requirement;
Step 2: the low setting-out that workshop provides is pressurized to the water under high pressure of desirable pressure, and the force value of water under high pressure is 1.8～2.5MPa;
Step 3: carry out water rate control by regulating valve and effusion meter, to export required injection flow rate;
Step 4: atomization cooling water, sprays to strand with cooling and purging strand.
9. the strong refrigerating technology of strand as claimed in claim 8, wherein, after the described low setting-out supercharging supplying water-pressurization system (1) to be provided in workshop, when the pressure of supercharging delivery side of pump is more than a setting value, automatic decompression valve (33) is opened and is reduced to this setting value, be then shut off automatic decompression valve (33).
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