CN109365552A - A kind of finish rolling dephosphorization system - Google Patents
A kind of finish rolling dephosphorization system Download PDFInfo
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- CN109365552A CN109365552A CN201811576074.4A CN201811576074A CN109365552A CN 109365552 A CN109365552 A CN 109365552A CN 201811576074 A CN201811576074 A CN 201811576074A CN 109365552 A CN109365552 A CN 109365552A
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- Prior art keywords
- dephosphorization
- valve
- finish rolling
- scaling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
- B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pipe Accessories (AREA)
Abstract
A kind of finish rolling dephosphorization system of the present invention, is related to steel industry hot rolling tinuous production apparatus field, and in particular to a kind of finish rolling dephosphorization system.Several the first dephosphorization branches are provided on the low pressure inlet pipeline, the first dephosphorization branch road is provided with high pressure centrifugal pump and outlet non-return valve, the first dephosphorization branch passes through intermediate duct and is connected with multiple second dephosphorization branches, the second dephosphorization branch road is provided with injection valve, and the dephosphorizing machine collector is connected with the second dephosphorization branch far from one end of intermediate duct.The present invention has the de-scaling time long, de-scaling interval is short and the small feature of de-scaling flow, a shock and vibration when accumulator is used to absorb injection valve opening and closing are arranged in system, de-scaling is directly supplied water with water by high pressure centrifugal pump, therefore finish rolling descaling system does not have pressure drop caused by accumulator, de-scaling pressure is stablized, and the scale removal effect and temperature drop before and after steel plate are almost the same, and the performance of steel plate is effectively guaranteed.
Description
Technical field
The present invention relates to steel industry hot rolling tinuous production apparatus fields, and in particular to a kind of finish rolling dephosphorization system.
Background technique
Descaling system is the important equipment of steel industry hot continuous rolling production line, is imitated to the de-scaling for guaranteeing hot-continuous-rolling strip steel product
Fruit and mechanical performance index play irreplaceable role.Before solving finish rolling de-scaling point scale removal effect and product mechanical performance
Afterwards the problem of difference, the hot continuous rolling production lines such as 1580,1780,2050,2150 and 2250 are created in recent years, high-pressure water descaling
System is divided into roughing and finish rolling two systems.Roughing descaling system de-scaling point is short with the de-scaling time, flow is big and de-scaling interval
The feature of time length, therefore the accumulator equipment of descaling system setting large volume, and there are insufficient pressure, nothings for finish rolling descaling mill
Method effectively removes the iron scale in profile just face, and there are overflow phenomena in use process, causes to waste.
Summary of the invention
To solve the above-mentioned problems, it is long to provide a kind of de-scaling time by the present invention, and de-scaling interval is short and de-scaling flow is small, can
Shock and vibration when injection valve opening and closing are absorbed, de-scaling pressure is stablized, and the scale removal effect and temperature drop before and after steel plate are almost the same, has
A kind of finish rolling dephosphorization system of the performance that ensure that steel plate of effect.
A kind of finish rolling dephosphorization system of the present invention, including dephosphorizing machine collector, including low pressure inlet pipeline, the low pressure water inlet pipe
Road is provided with several the first dephosphorization branches, and the first dephosphorization branch road is provided with high pressure centrifugal pump and outlet non-return valve,
The first dephosphorization branch passes through intermediate duct and is connected with multiple second dephosphorization branches, and the second dephosphorization branch road is provided with
Injection valve, the dephosphorizing machine collector are connected with the second dephosphorization branch far from one end of intermediate duct；
An accumulator is connected in the intermediate duct, the accumulator is connected by lowest liquid level valve with intermediate duct；
The first dephosphorization branch road is respectively connected with a bypass, is respectively connected with first throttling device in the bypass；The injection
Second throttling device is parallel on valve.
Preferably, first throttling device includes first throttle pipeline, it is described throttling pipeline one end and high pressure centrifugal pump and
Pipeline between outlet non-return valve is connected, and the other end is connected with a collecting-tank；The throttle pipe road is connected with bypass minimum stream
Measure valve and throttle valve.
Preferably, second throttling device include second throttling pipeline, the second throttle pipe road be connected in turn filling valve and
Throttle valve.
Preferably, the first dephosphorization branch road between low pressure inlet pipeline and high pressure centrifugal pump is provided with pump inlet maintenance
Valve.
Preferably, the first dephosphorization branch road between outlet non-return valve and intermediate duct is provided with the first service valve.
Preferably, accumulator is connected by the second service valve with lowest liquid level valve.
Or preferably, the first dephosphorization branch is set as three.
Preferably, the second dephosphorization branch is set as two.
Preferably, the second dephosphorization branch passes through third service valve and is connected with intermediate duct.
The present invention has the de-scaling time long, and de-scaling interval is short and an accumulator is arranged in the small feature of de-scaling flow, system
For absorbing shock and vibration when injection valve opening and closing, de-scaling is directly supplied water with water by high pressure centrifugal pump, therefore finish rolling de-scaling system
It unites pressure drop caused by no accumulator, de-scaling pressure is stablized, and the scale removal effect and temperature drop before and after steel plate are almost the same, effectively
It ensure that the performance of steel plate.
Detailed description of the invention
Fig. 1 is schematic structural view of the invention.
Specific embodiment
A kind of finish rolling dephosphorization system of the present invention, including dephosphorizing machine collector, including low pressure inlet pipeline, the low pressure water inlet pipe
Road is provided with several the first dephosphorization branches, and the first dephosphorization branch road is provided with high pressure centrifugal pump and outlet non-return valve,
The first dephosphorization branch passes through intermediate duct and is connected with multiple second dephosphorization branches, and the second dephosphorization branch road is provided with
Injection valve, the dephosphorizing machine collector are connected with the second dephosphorization branch far from one end of intermediate duct；
An accumulator is connected in the intermediate duct, the accumulator is connected by lowest liquid level valve with intermediate duct；
The first dephosphorization branch road is respectively connected with a bypass, is respectively connected with first throttling device in the bypass；The injection
Second throttling device is parallel on valve.
First throttling device includes first throttle pipeline, one end and the high pressure centrifugal pump and outlet non-return of the throttling pipeline
Pipeline between valve is connected, and the other end is connected with a collecting-tank；The throttle pipe road is connected with bypass minimum flow valve and section
Flow valve.
Second throttling device includes the second throttling pipeline, and the second throttle pipe road is connected with filling valve and throttle valve in turn.
The first dephosphorization branch road between low pressure inlet pipeline and high pressure centrifugal pump is provided with pump inlet service valve.
The first dephosphorization branch road between outlet non-return valve and intermediate duct is provided with the first service valve.
Accumulator is connected by the second service valve with lowest liquid level valve.
First dephosphorization branch is set as three.
Second dephosphorization branch is set as two.
Second dephosphorization branch passes through third service valve and is connected with intermediate duct.
High-pressure water descaling system de-scaling operation and not de-scaling operation alternate run, it is descaling mill collection that injection valve, which is opened, when de-scaling
Pipe provides high pressure water, and when not de-scaling then closes injection valve.High pressure centrifugal pump need to be arranged minimum discharge and protect this system not remove
High pressure centrifugal pump is protected when squama, minimum flow valve is normally opened automatic valve, chain control is carried out with injection valve, in throttle valve
Portion is equipped with multiple groups restricting orifice, the output flow controlled using the principle of orifice restriction.
High pressure centrifugal pump the minimum discharge that do not generate heat, cavitation and mechanical breakdown in the case where can work normally be known as from
The continuous minimum discharge of heart pump, is divided into two kinds, and one is minimum continuous-stable flow, another kind is minimum continuous heat flow.Most
Small continuous-stable flow refers to the minimum that pump can be worked normally in the case where being no more than noise limit as defined in standard and vibration limit
Flow is tested by experimental method by pump factory and is obtained；Minimum continuous heat flow refers to that pump is able to maintain that work and it runs
The minimum discharge that the temperature rise of liquid is damaged will not be pumped, can be obtained by calculating.
To reduce system energy consumption and convenient for adjusting de-scaling pressure, more hot continuous rolling production line finish rolling descaling system is provided with
Variable-frequency Regulating System.Finish rolling high-pressure water descaling frequency conversion system and the operational mode of non-frequency system are different.
The finish rolling non-frequency descaling system method of operation: low pressure water enters pressure duct, steel billet after high pressure centrifugal pump pressurizes
3-5s before arrival finish rolling descaling mill, it is descaling mill collector water-filling that de-scaling filling valve, which is opened, prevents air from entering descaling mill collector and draws
Play vibration.Steel billet opens injection valve when reaching finish rolling descaling mill and carries out de-scaling, simultaneously closes off minimum flow valve.De-scaling finishes, and closes
Injection valve is closed, while opening minimum flow valve, delay 2s closes filling valve.Non-frequency finish rolling descaling system is in not de-scaling, most
Small flow valve opens the water of discharge certain flow, is effectively prevented high pressure centrifugal pump fever, cavitation and vibration.It is opened in injection valve
When, accumulator is that descaling mill collector instantaneously supplies water, and because accumulator volume is small, with the progress of de-scaling, energy storage pressure drops to
When consistent with the outlet pressure of high pressure centrifugal pump, accumulator does not supply water externally.De-scaling finishes, and injection valve is closed, minimum flow valve
It opens, because the flow of minimum flow valve only has the 35%-40% of high pressure centrifugal pump metered flow, flow when being less than de-scaling is high at this time
Outlet of centrifugal pump pressure is pressed to be higher than energy storage pressure, high pressure centrifugal pump gives accumulator moisturizing, when the pressure of accumulator reaches high pressure
When outlet of centrifugal pump pressure, high pressure centrifugal pump is no longer accumulator moisturizing, and whole flows of high pressure centrifugal pump output pass through bypass
Minimum flow valve and throttling set discharge.Thus it can find, accumulator can absorb certain water when injection valve is closed, effectively
High pressure water is to line shock and vibration when preventing injection valve from closing.
The finish rolling frequency conversion descaling system method of operation: steel billet reaches 8-10s before finish rolling descaling mill, and frequency converter raising frequency is opened simultaneously
Minimum flow valve is opened, delay 2-3s opens the pre- filling valve of de-scaling.When steel billet reaches finish rolling descaling mill, frequency converter is through 8-10s raising frequency
To de-scaling frequency, injection valve, which is opened, carries out de-scaling for operation, simultaneously closes off minimum flow valve.De-scaling finishes, and closes injection valve, opens
Minimum flow valve, while frequency converter frequency reducing is run, delay 2s closes de-scaling filling valve.Frequency converter is downconverted to low speed running frequency
Afterwards, minimum flow valve is closed.High pressure centrifugal pump is in low-frequency operation, since the shaft power of high pressure centrifugal pump only has rated shaft power
15-20%, minimum continuous-stable flow is very small, and high pressure centrifugal pump can be run with valve closing.When long-time valve closing is run, high pressure
The case temperature of centrifugal pump can increase, and minimum flow valve is opened when arriving setting value, and certain water is discharged, takes away in high pressure centrifugal pump
Portion's heat, minimum flow valve is closed after high pressure centrifugal pump case temperature drops to setting value.It can be found that the method for operation de-scaling
System energy consumption significantly reduces.
The present invention has the de-scaling time long, and de-scaling interval is short and an accumulator is arranged in the small feature of de-scaling flow, system
For absorbing shock and vibration when injection valve opening and closing, de-scaling is directly supplied water with water by high pressure centrifugal pump, therefore finish rolling de-scaling system
It unites pressure drop caused by no accumulator, de-scaling pressure is stablized, and the scale removal effect and temperature drop before and after steel plate are almost the same, effectively
It ensure that the performance of steel plate.
Claims (9)
1. a kind of finish rolling dephosphorization system, including dephosphorizing machine collector, which is characterized in that including low pressure inlet pipeline, the low pressure into
Several the first dephosphorization branches are provided in water lines, the first dephosphorization branch road is provided with high pressure centrifugal pump and outlet non-return
Valve, the first dephosphorization branch pass through intermediate duct and are connected with multiple second dephosphorization branches, and the second dephosphorization branch road is set
It is equipped with injection valve, the dephosphorizing machine collector is connected with the second dephosphorization branch far from one end of intermediate duct；
An accumulator is connected in the intermediate duct, the accumulator is connected by lowest liquid level valve with intermediate duct；
The first dephosphorization branch road is respectively connected with a bypass, is respectively connected with first throttling device in the bypass；The injection
Second throttling device is parallel on valve.
2. a kind of finish rolling dephosphorization system as described in claim 1, which is characterized in that the first throttling device includes first throttle
One end of pipeline, the throttling pipeline is connected with the pipeline between high pressure centrifugal pump and outlet non-return valve, and the other end is connected with one
Collecting-tank；The throttle pipe road is connected with bypass minimum flow valve and throttle valve.
3. a kind of finish rolling dephosphorization system as claimed in claim 2, which is characterized in that the second throttling device includes the second throttling
Pipeline, the second throttle pipe road are connected with filling valve and throttle valve in turn.
4. a kind of finish rolling dephosphorization system as claimed in claim 3, which is characterized in that the low pressure inlet pipeline and high pressure centrifugal pump
Between the first dephosphorization branch road be provided with pump inlet service valve.
5. a kind of finish rolling dephosphorization system as claimed in claim 4, which is characterized in that between the outlet non-return valve and intermediate duct
The first dephosphorization branch road be provided with the first service valve.
6. a kind of finish rolling dephosphorization system as claimed in claim 5, which is characterized in that the accumulator is by the second service valve and most
Low liquid elevating valve is connected.
7. a kind of finish rolling dephosphorization system as claimed in any one of claims 1 to 6, which is characterized in that the first dephosphorization branch is set
It is set to three.
8. a kind of finish rolling dephosphorization system as claimed in claim 7, which is characterized in that the second dephosphorization branch is set as two.
9. a kind of finish rolling dephosphorization system as claimed in claim 8, which is characterized in that the second dephosphorization branch is examined by third
Valve is repaired to be connected with intermediate duct.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811576074.4A CN109365552A (en) | 2018-12-22 | 2018-12-22 | A kind of finish rolling dephosphorization system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811576074.4A CN109365552A (en) | 2018-12-22 | 2018-12-22 | A kind of finish rolling dephosphorization system |
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| Publication Number | Publication Date |
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| CN109365552A true CN109365552A (en) | 2019-02-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811576074.4A Pending CN109365552A (en) | 2018-12-22 | 2018-12-22 | A kind of finish rolling dephosphorization system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110883115A (en) * | 2019-12-13 | 2020-03-17 | 四川德胜集团钒钛有限公司 | Steel billet descaling device |
| CN113042553A (en) * | 2021-02-25 | 2021-06-29 | 首钢京唐钢铁联合有限责任公司 | Finish descaling device and hot rolling production line of hot rolling |
-
2018
- 2018-12-22 CN CN201811576074.4A patent/CN109365552A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110883115A (en) * | 2019-12-13 | 2020-03-17 | 四川德胜集团钒钛有限公司 | Steel billet descaling device |
| CN110883115B (en) * | 2019-12-13 | 2022-02-18 | 四川德胜集团钒钛有限公司 | Steel billet descaling device |
| CN113042553A (en) * | 2021-02-25 | 2021-06-29 | 首钢京唐钢铁联合有限责任公司 | Finish descaling device and hot rolling production line of hot rolling |
| CN113042553B (en) * | 2021-02-25 | 2023-02-17 | 首钢京唐钢铁联合有限责任公司 | Hot rolling fine descaling device and hot rolling production line |
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Application publication date: 20190222 |