CN104525885A - Cast steel strong cooling spraying system and strong cooling technology method - Google Patents
Cast steel strong cooling spraying system and strong cooling technology method Download PDFInfo
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- CN104525885A CN104525885A CN201410849050.7A CN201410849050A CN104525885A CN 104525885 A CN104525885 A CN 104525885A CN 201410849050 A CN201410849050 A CN 201410849050A CN 104525885 A CN104525885 A CN 104525885A
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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
Abstract
The invention provides a casting blank strong cooling spraying system. The cast steel strong cooling spraying system comprises a water supply pressurization system (1), a water quantity adjusting system (2), a pressure relieving protection system (3), a spraying system body (4) and a casting blank temperature control system (5). The water supply pressurization system (1) is arranged nearby continuous casting machine equipment and used for pressurizing low-pressure water into high-pressure water, the water quantity adjusting system (2) is used for calculating the water quantity needed by cooling a casting blank to the target temperature and outputting the needed spraying water, the pressure relieving protection system (3) is used for carrying out water draining and pressure reducing when the pressure of a pump opening of a booster pump exceeds a certain set value, the spraying system body (4) comprises high-pressure nozzles (41) which are evenly arranged, the nozzles fully atomize high-pressure cooling water so as to spray the water to the surface of the casting blank, and a computer control model is utilized by the casting blank temperature control system (5) for calculating a temperature field of the casting blank. The casting blank strong cooling system is simple, a strong cooling technology method is high in maneuverability and easy to implement, meanwhile, the technology method can well avoid external corner cracking of the casting blank, ensure the metal shrinking percentage of the casting blank, and reduce the workloads of polishing of the casting blank, and therefore the good economic benefits are generated.
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 be shaped, 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 from crystallizer top continuously, after the effects such as crystallizer cooled and solidified, the inner casting blank shell for liquid molten steel is formed in crystallizer internal cavity bottom, under the dragging effect of the drawing straightener arranged below crystallizer, strand is along crystallizer continuous output from top to bottom.
The vanguard technology of existing continuous casting steel machine is near the drawing straightener, arrange one or several milling trains, the internal soundness of strand is changed in the mode changing strand cross section, specific implementation process is: strand is after the cooling of Mould and Secondary Cooling district, the high temperature strand forming certain thickness or solidify 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, inner indices Performance Ratio wants high without the strand of high temperature rolling, but there is corner crack in strand after rolling, to continue to use in a rear operation, across corner must carry out reconditioning, remove a large amount of corner crack regions, this just directly causes 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 cross section exists the situation that central temperature is greater than edge temperature, edge temperature is greater than bight temperature.Strand is near the milling train position arranged, in most cases, likely the temperature in bight can between 700 ~ 900 degree, and in this temperature range, and strand reheat vapor cycle of rising again on secondary cooling zone sub-cooled and surface can increase the precipitation capacity of ALN and the reduction causing steel moulding.That is, the operation carrying out changing shape to strand is not suitable in this case.
Summary of the invention
The object of this invention is to provide the strong cold water spray system before a kind of continuous casting steel machine rolling and the strong cooling method corresponding with this spray system, by the water-spraying control of high strength, the bight temperature of strand before entering milling train is made to be reduced to less than 700 degree (concrete technology parameter needs to formulate according to conditions such as strand steel grade, strand cross section, roll reduction) thus to solve 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-pressure water in order to be provided in workshop is pressurized to required pressure of supply water value;
Runoff investigation system, in order to calculate the water yield required for slab cooling to target temperature, regulates the water spray needed for size and output finally controlling the water yield simultaneously by PID;
Decompression protection system, in order to when the pump intake pressure of booster pump exceedes a certain setting value, carries out draining until the pump intake pressure of booster pump is less than a certain setting value;
Spray system, the high pressure nozzle that the shape including foundation strand is evenly arranged, abundant for high-pressure cooling water atomized spray to the surface of strand, is carried out Homogeneous cooling to strand by it;
Strand temperature control system, utilizes computer-controlled model, the temperature field of accurate Calculation strand.
Further, include 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 the described water-pressurization system that supplies.
Further, described runoff investigation system includes hand off valve, flowmeter, automatic regulating valve and distance-transmission pressure gauge, and described flowmeter and automatic regulating valve form closed-loop control system, and automatic regulating valve responds the water yield value exporting and require fast.
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 output.
Further, described multiple high pressure nozzle is installed in stay-warm case; Described stay-warm case 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 comprises calculation model for temperature field computer, in order to the temperature field of accurate Calculation target strand, described flowmeter is in order to feed back the cooling water inflow of actual use to computer, Computer calculates temperature field, then according to the whole temperature field of process control overflow correction, to water yield required value.
The present invention also provides a kind of and above-mentioned strand strong refrigerating technology corresponding for the strong cold water spray of the strand before continuous casting steel machine rolling process system, and concrete technology method is as follows:
Step one: calculate temperature field, strand cross section, determine strong cold institute water requirement;
Step 2: the low-pressure water provided in workshop is pressurized to the water under high pressure of required pressure;
Step 3: carry out water rate control by control valve and flowmeter, to export required injection flow rate;
Step 4: atomization cooling water, is injected into strand with cooling and purging strand.
Further, after the low-pressure water supercharging that workshop is provided, when the pressure of supercharging delivery side of pump is greater than a particular value, automatic decompression valve is opened and is reduced to a setting value, then close automatic decompression valve.
The strong cooling system of strand of the present invention is simple, and strong refrigerating technology is workable, easy to implement.This process can solve the outside chink of strand well simultaneously, ensures the metal contracts rate of strand, and decreases the workload of strand reconditioning, thus can produce good economic benefit.
Accompanying drawing explanation
The strong cold water spray system schematic that Fig. 1 uses for the strong cold technical process before continuous casting steel machine rolling of the present invention.
Fig. 2 is the stay-warm case of cold water spray system strong described in Fig. 1 and the installation diagram of roller-way.
Fig. 3 is arrangement of nozzles Fig. 1 of cold water spray system strong described in Fig. 1.
Fig. 4 is the section A-A schematic diagram of arrangement of nozzles Fig. 1 of cold water spray system strong described in Fig. 3.
Detailed description of the invention
Object for a better understanding of the present invention and design feature, below in conjunction with its accompanying drawing, actual condition, be described in detail the structure of the specific embodiment of the invention and the course of work.
The strong cold water spray system schematic that Fig. 1 uses for the strong cold technical process before continuous casting steel machine rolling of the present invention.As 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 for water-pressurization system 1, be arranged near continuous casting machine, be pressurized to required pressure of supply water value with the low-pressure water realizing providing to workshop.The described water-pressurization system that supplies 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 supplying the setting of water-pressurization system thus realizing low-pressure water supercharging being the water under high pressure with required force value.
Described runoff investigation system 2 includes hand off valve 21, flowmeter 22, automatic regulating valve 23 and distance-transmission pressure gauge 24.According to calculation model for temperature field, the water yield be cooled to by strand 42 needed for target temperature is calculated by computer 51, water yield required value is issued the closed-loop control system that flowmeter 22 and automatic regulating valve 23 formed and carries out PID adjustment, finally by automatic regulating valve 23 fast response export the water yield value required.
Described decompression protection system includes hand off valve 31, distance-transmission pressure gauge 32, automatic decompression valve 33.Carry out the pressure of monitoring booster pump 12 output 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 when being less than a certain setting value, automatic decompression valve 33 is closed.
Described spray system comprises high pressure nozzle 41, strand 42 and roller-way 43.As shown in Figure 2, described high pressure nozzle 41 is evenly arranged on the spray header that is fixed in stay-warm case 6, and described stay-warm case 6 is fixed in roller bed frame 7 in the mode of bearing pin voussoir.The effect of protective cover is: after making slab cooling, can ensure that the steam that cooling water heat is evaporated can be collected in two cold houses effectively while surface temperature homogenising.As shown in Figures 3 and 4, the stay-warm case of strand 42 periphery before casting is furnished 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 arranging 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 evenly arranged according to the cross 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, be injected into the surface of strand 42, strand is cooled uniformly, because the pressure supplied water is pressurizeed by pressure charging system 1, so cooling water is injected into the speed on the surface of strand 42 quickly, the effect purging strand 42 surface scale can be played.
Described strand temperature control system 5 comprises calculation model for temperature field computer 51, the feedback data of flowmeter 22 and calculating object strand 42.This system utilizes computer-controlled model, the temperature field of accurate Calculation strand.By the flowmeter 22 feedback data i.e. actual cooling water inflow used to computer model, computer 51 calculates actual temperature field, then process control overflow according to the present invention revises whole temperature field further, to water yield required value, and when the creation data of reality changes, models for temperature field calculates water yield required value in time.Meanwhile, this system possesses the real-time hold function of historical data, so that follow-up improvement and research use.
In enforcement of the present invention, have selected automatic runoff investigation system, the flowmeter of teletransmission as shown in Figure 1 and automatic control valve, both form closed-loop control system, are regulated by PID, the water yield of energy needed for quick response system.And Long-distance Control can be carried out in real time, provide 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 rolling of the present invention is realized by the strong cooling system of above-mentioned strand.Specifically, describedly after low-pressure water is pressurized to required pressure, subsequent technique is supplied for water-pressurization system 1; Described runoff investigation system 2, in order to the water spray water yield of target temperature required for calculating according to strand temperature control system, carries out the control of water yield size, the water spray water yield needed for output by control valve and flowmeter; Described decompression protection system, in order to when booster pump outlet pressure increases to a certain degree, carries 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, be injected into strand, the effect played cooling and purge; The Main Function of described strand temperature control system is according to on-the-spot feedback data input temp field computation model, calculates strand temperature field in real time, the water spray water yield needed for exporting according to surface temperature control, and saves historical data in real time for analysis and research.
Above-mentioned strong refrigerating technology has following beneficial effect: automaticity is high, in the casting process of strand, temperature field, strand cross section before Temperature Field Control model can be utilized to calculate rolling, thus determine the water yield of forcing cooling to need, the object of given certain water yield is reached by the automatic regulating valve door of cooling system; Monitoring, operation, debugging overall process provide man-machine interface picture, thus maintain easily; Real-time online amendment technological parameter, saves historical data in real time, thus ensures the steady quality of strand.This process can purge the iron scale disposing casting billet surface effectively when cooling water pressurized spray, thus makes the cc billet surface quality after rolling very high.This process effectively improves plasticity and the intensity in strand edge and bight, improves the internal soundness of strand simultaneously.This process improves the metal contracts rate of strand, and then also improves productivity effect.By the cooling of high strength, the edge of casting blank shell and bight form the tiny equiaxed grain structure of low temperature, and plasticity improves; By the cooling of high strength, make strand when base shell shrinks, center is still high temperature strand or liquid molten steel, some casting blank defects (center porosity, central pipe) existed, being contracted in of base shell have compressed center strand or liquid molten steel to a certain extent, thus improves the internal soundness of strand; By the cooling of high strength, a temperature transition district is there is between the center of strand and base shell, temperature range is between 700 ~ 900 degree, this temperature transition district forms a brittle layer, but due to the contraction of casting blank shell, and there is certain plasticity and intensity, brittle layer is fettered, makes described brittle layer be unlikely to occur brittle crack.
The above is only a kind of detailed description of the invention of strong cold technique of the present 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 considered as the protection domain belonging to invention.
Claims (10)
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-pressure water in order to be provided in workshop is pressurized to required pressure of supply water value;
Runoff investigation system (2), in order to calculate the water yield required for slab cooling to target temperature, regulates the water spray needed for size and output finally controlling the water yield simultaneously by PID;
Decompression protection system (3), in order to when the pump intake pressure of booster pump exceedes a certain setting value, carries out draining until the pump intake pressure of booster pump is less than a certain setting value;
Spray system (4), the high pressure nozzle (41) that the shape including foundation strand is evenly arranged, abundant for high-pressure cooling water atomized spray to the surface of strand, is carried out Homogeneous cooling to strand by it;
Strand temperature control system (5), utilizes computer-controlled model, the temperature field of accurate Calculation 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 2, is characterized in that, the pressure of supply water of continuous casting workshop 0.4 ~ 1.0MPa is pressurized to final pressure 1.8 ~ 2.5MPa by the described water-pressurization system (1) that supplies.
4. 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), flowmeter (22), automatic regulating valve (23) and distance-transmission pressure gauge (24), described flowmeter (22) and automatic regulating valve (23) form closed-loop control system, and automatic regulating valve 23 fast response exports the water yield value required.
5. the strong cold water spray system of strand as claimed in claim 1, it is characterized 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) output.
6. the strong cold water spray system of strand as claimed in claim 1, it is characterized in that, described multiple high pressure nozzle (41) is installed in stay-warm case; Described stay-warm case is fixed in roller bed frame by the mode of bearing pin voussoir.
7. the strong cold water spray system of strand as claimed in claim 6 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.
8. the strong cold water spray system of strand as claimed in claim 4, it is characterized in that, described strand temperature control system (5) comprises calculation model for temperature field computer (51), in order to the temperature field of accurate Calculation target strand, described flowmeter (22) is in order to feed back the cooling water inflow of actual use to computer (51), Computer calculates temperature field, then according to the whole temperature field of process control overflow correction, to water yield required value.
9., for the strong refrigerating technology of the 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 cross section, determine strong cold institute water requirement;
Step 2: the low-pressure water provided in workshop is pressurized to the water under high pressure of required pressure;
Step 3: carry out water rate control by control valve and flowmeter, to export required injection flow rate;
Step 4: atomization cooling water, is injected into strand with cooling and purging strand.
10. the strong refrigerating technology of strand as claimed in claim 9, wherein, after the described low-pressure water supercharging supplying water-pressurization system (1) to be provided in workshop, when the pressure of supercharging delivery side of pump is greater than a particular value, automatic decompression valve (33) is opened and is reduced to a setting value, then close automatic decompression valve (33).
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Cited By (10)
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| CN105238921A (en) * | 2015-09-29 | 2016-01-13 | 广东冠华传导科技有限公司 | Aluminum alloy continuous casting and rolling unit molten aluminum crystallizing wheel quenching control system |
| CN105478704A (en) * | 2016-01-04 | 2016-04-13 | 河北钢铁股份有限公司邯郸分公司 | System for preventing continuous casting corner crack defect of micro-alloy steel casting blank and application method thereof |
| CN105728680A (en) * | 2016-05-04 | 2016-07-06 | 上海耀秦冶金设备技术有限公司 | Gas-water balance dynamical control method for continuous-casting machine |
| CN108176829A (en) * | 2018-01-19 | 2018-06-19 | 天津荣程联合钢铁集团有限公司 | A kind of conticaster method for treating water and plank obtained by this method |
| CN109351927A (en) * | 2018-12-05 | 2019-02-19 | 联峰钢铁（张家港）有限公司 | A kind of conticaster crystallizer cooling water recirculation system |
| CN109865811A (en) * | 2019-04-04 | 2019-06-11 | 山东钢铁股份有限公司 | A kind of three times cooling device of conticaster and its continuous casting billet |
| US10722824B2 (en) | 2016-10-18 | 2020-07-28 | Ecolab Usa Inc. | Device to separate water and solids of spray water in a continuous caster, and method to monitor and control corrosion background |
| CN111677044A (en) * | 2020-05-11 | 2020-09-18 | 首钢集团有限公司 | Regional constant pressure water supply system of hot continuous rolling line casting machine |
| CN114173958A (en) * | 2019-08-02 | 2022-03-11 | 杰富意钢铁株式会社 | Secondary cooling device and secondary cooling method for continuous casting of cast piece |
| CN116944455A (en) * | 2023-09-06 | 2023-10-27 | 江苏群达机械科技有限公司 | High strength alloy gray cast iron manufacture equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109351927A (en) * | 2018-12-05 | 2019-02-19 | 联峰钢铁（张家港）有限公司 | A kind of conticaster crystallizer cooling water recirculation system |
| CN109865811A (en) * | 2019-04-04 | 2019-06-11 | 山东钢铁股份有限公司 | A kind of three times cooling device of conticaster and its continuous casting billet |
| CN114173958A (en) * | 2019-08-02 | 2022-03-11 | 杰富意钢铁株式会社 | Secondary cooling device and secondary cooling method for continuous casting of cast piece |
| CN111677044A (en) * | 2020-05-11 | 2020-09-18 | 首钢集团有限公司 | Regional constant pressure water supply system of hot continuous rolling line casting machine |
| CN111677044B (en) * | 2020-05-11 | 2021-10-26 | 首钢集团有限公司 | Regional constant pressure water supply system of hot continuous rolling line casting machine |
| CN116944455A (en) * | 2023-09-06 | 2023-10-27 | 江苏群达机械科技有限公司 | High strength alloy gray cast iron manufacture equipment |
| CN116944455B (en) * | 2023-09-06 | 2024-03-01 | 江苏群达机械科技有限公司 | High strength alloy gray cast iron manufacture equipment |
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