CN1775399A - High-pressure water descaling system - Google Patents
High-pressure water descaling system Download PDFInfo
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- CN1775399A CN1775399A CN 200510032519 CN200510032519A CN1775399A CN 1775399 A CN1775399 A CN 1775399A CN 200510032519 CN200510032519 CN 200510032519 CN 200510032519 A CN200510032519 A CN 200510032519A CN 1775399 A CN1775399 A CN 1775399A
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- scaling
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Abstract
The present invention relates to a high-pressure water scale-removing system. It includes cleaning filter and minimum flow valve group. After the described self-cleaning filter successively are set diaphragm type water storage tank and descaling pump group, and after the described minimum flow valve group successively are set low-pressure precharging valve group, on-machine descaling sprays, on-maching descaling manifold, high-effective descaling nozzle, descaling tank descaling spray valve group, descaling tank descaling manifold and descaling tank high-effective nozzle. Said invention adopts high-pressure variable frequency speed-regulating technique to raise descaling efficiency.
Description
[technical field]
The present invention relates to a kind of save up strength high-pressure water descaling system of a jar buffer shock-absorbing, full-automatic de-scaling operation control of converter technique, width de-scaling control, big flow SDS type bivalve body impeller symmetric arrangement descaling pump, diaphragm type that adopts.
[background technology]
Explanation of nouns: L1, L2 control system: i.e. basic automatization level (L1) and process control computer level (L2).Wherein the basic automatization level comprises electric automatization and instrument automation, adopts the PLC system to finish the sampling of sequential control, correlate meter, the control of executing agency.The process control computer level realizes the various parameters of unit equipment are carried out for a long time memory function continuously, and the interference volume of dynamic process is had the rapid-action ability.The setting that utilizes technological specification and Mathematical Modeling to carry out multi-parameter is on the one hand calculated, and assigns setting value to control appliance; By the measured value Collection and analysis, carry out the self adaptation and the self-learning function of control parameter on the other hand, improve the accuracy of setting value, realize control procedure again, reach the optimization of control target.
This automation control system is made up of upper monitoring computer, PLC Programmable Logic Controller, AC frequency control apparatus, network, on-the-spot checkout equipment, field control equipment etc.Wherein lower computer system uses TOSHIBAV-series PLC to finish field monitoring, data are handled; Master system adopts Industrial PC Computer to realize the visual monitoring of field data.
High-pressure water descaling adopts the high-pressure spray incision principle, by the water under high pressure that nozzle ejection goes out, hits at billet surface, removes stove by De-scaling box and gives birth to iron scale, removes the regenerating oxidation iron sheet by descaling jet on the four-high mill again.
The quality of scale removal effect directly influences the surface quality and the roll campaign of steel sheet product, and de-scaling will not cause the surface of steel plate pockmark only, increases roll wear.High-pressure water descaling system generally partly is made up of de-scaling device, electric-control system etc. on high-pressure water prmp room, pressure duct, control valve platform, De-scaling box, the machine.
Fig. 1 is seen in the technological process of domestic and international common cut deal (volume) milling train high-pressure water descaling system at present, its capital equipment disposes: self-cleaning filter 1, alternating current generator and fluid coupling 2, mono-hull tandem centrifugal pump 3, the other operation of machine cabinet 4, minimum flow valve group 5, motor-operated control valve and check valve set 6, De-scaling box injection valve group 7, low pressure Prefill valve group 8, save up strength jar and water-level control apparatus 9, save up strength jar and water-level control apparatus 9 are generally four groups, de-scaling injection valve group 10 on the machine, De-scaling box high efficiency nozzle 11, de-scaling storage 12 on the machine, efficient descaling jet 13, electrical control cabinet 14, turbid circulating water water system 15.
The course of work of existing high-pressure water descaling system is: when not de-scaling of system, de-scaling injection valve group 10 is all closed on De-scaling box injection valve group 7 and the machine, centrifugal pump 3 first high pressure are to jar 9 water-fillings that save up strength, when jar water level that saves up strength reaches high water level, high water level control liquid level gauge 9 senders are to control electrical control cabinet 14, electrical control cabinet 14 sends instruction throws off fluid coupling 2, and minimum flow valve group 5 is opened, and centrifugal pump 3 is turned round under the low pressure low discharge.
When system's de-scaling, de-scaling injection valve group is opened on De-scaling box injection valve group 7 or the machine, electrical control cabinet 14 sends instruction and makes fluid coupling 2 closures, minimum flow valve group 5 is closed, centrifugal pump 3 high-pressure high-flows de-scaling injection valve group 10 on De-scaling box injection valve group 7 or machine supplies water, and jar 9 control valves that save up strength are simultaneously opened de-scaling injection valve group water supply on De-scaling box injection valve group 7 or machine.When jar 9 water levels that save up strength reached low water level, jar 9 control valves that save up strength were closed; After de-scaling finished, de-scaling injection valve group 10 was closed on De-scaling box injection valve group 7 or the machine, and jar 9 control valves that save up strength are opened, and centrifugal pump 3 continues to jar 9 water-fillings that save up strength, and when jar 9 water levels that save up strength reached high water level, centrifugal pump 3 turned round under the low pressure low discharge again.
Though existing high-pressure water descaling system can be selected the high-pressure pump than low discharge, small investment; But shortcoming is more obvious, requirement has bigger factory building, weight of equipment is big, and automaticity is low, and requiring has the special messenger to operate, jar 9 easy deflation accidents of metalling run out save up strength, system pressure fluctuation is bigger, and system pressure can not be according to slab material, temperature and self adaptation is regulated, long energy consumption waste and the influence of rolled rhythm of causing of system's buck time, the design of de-scaling device can not be controlled the switching quantity of nozzle according to the rolled piece width, causes energy waste.
[summary of the invention]
In order to overcome the above-mentioned shortcoming of prior art, the invention provides a kind of save up strength high-pressure water descaling system of a jar buffer shock-absorbing, full-automatic de-scaling operation control of converter technique, width de-scaling control, big flow SDS type bivalve body impeller symmetric arrangement descaling pump, diaphragm type that adopts.
The technical solution adopted for the present invention to solve the technical problems is: high-pressure water descaling system, comprise filter rinsed and minimum flow valve group, after filter rinsed, be provided with diaphragm type water tank, descaling pump group successively, being provided with on low pressure Prefill valve group, the machine descaling header on de-scaling injection valve group, the machine, efficient descaling jet, De-scaling box de-scaling injection valve group, De-scaling box descaling header and De-scaling box high efficiency nozzle after the minimum flow valve group successively, realize energy-efficient automatic de-scaling by frequency-changing control system, L1, L2 level control operation system.
Described descaling pump group is a bivalve body impeller symmetric arrangement.
De-scaling injection valve component becomes two groups of controls on the described machine: wide de-scaling and narrow de-scaling, these two groups can be sprayed simultaneously, again can bank injection.
Descaling header, the control of efficient descaling jet and the control of de-scaling injection valve group adapt on the described machine.
The other organic side touch-screen that is provided with of described descaling pump group; When the other touch-screen of machine is mainly used in maintenance or debugging in the other start and stop descaling pump of machine group, need not during ordinary production.
The start-stop of descaling pump group: the start and stop of descaling pump group just often realize by the start-stop menu of clicking host service function chamber L2 level computer.Be in the low-pressure operation state after the descaling pump starting during not de-scaling.
De-scaling box de-scaling: when the other hot metal detector of De-scaling box front roller-way detects from red base that heating furnace is brought, to host service function chamber L1, L2 level control operation system sends position detection signal, L1, L2 level control operation system sends control instruction: the minimum flow valve group is closed, the descaling pump group rises to rotating speed the required rotating speed of work rapidly under the frequency-changing control system effect, its raising speed time is 4-6 second, after operating pressure and flow foundation, De-scaling box injection valve group is opened, its opening time is 1-3 second, this moment, steel billet just in time arrived De-scaling box descaling header position, the beginning de-scaling; When the steel billet afterbody passes through the De-scaling box descaling header, the other hot metal detector of roller-way sends position detection signal to host service function chamber L1, L2 level control operation system behind the De-scaling box, L1, L2 level control operation system send control instruction: De-scaling box injection valve group is closed, its shut-in time 2-4 second, stop de-scaling, the minimum flow valve group is opened, and the descaling pump group drops to rotating speed the rotating speed of 20-30% rapidly under the frequency-changing control system effect, its deceleration time is 4-6 second, descaling pump group low speed low-pressure operation.
The course of work of de-scaling is on the machine: whether host service function chamber L1, L2 level control operation system determine needs de-scaling and de-scaling passage distribution condition according to rolling shedule, when selecting strange passage de-scaling, as 1,3,5,7 passages; Automatically select width de-scaling pattern according to the supplied materials size; According to rolling shedule, as rolling temperature included in the rolling shedule, steel grade, passage assignment information, select de-scaling pressure and flow under the different steel grade different temperatures different in width conditions, send the action of instruction control frequency converter then.When rolling pass needs de-scaling, the other hot metal detector of roller-way sends position detection signal to host service function chamber L1, L2 level control operation system before or after the milling train, L1, L2 level control operation system send control instruction: the minimum flow valve group is closed, the descaling pump group rises to rotating speed the required rotating speed of work rapidly under the frequency-changing control system effect, its raising speed time is 4-6 second, after operating pressure and flow foundation, wide or narrow de-scaling injection valve group is opened on the machine, its opening time is 1-3 second, steel billet this moment descaling header position on the arrival machine just in time, the beginning de-scaling; When the steel billet afterbody passes through the De-scaling box descaling header, behind the milling train or the other hot metal detector of front roller-way send position detection signal to host service function chamber L1, L2 level control operation system, L1, L2 level control operation system send control instruction: wide or narrow de-scaling injection valve group is closed on the machine, its shut-in time 2-4 second, stop de-scaling, the minimum flow valve group is opened, the descaling pump group drops to rotating speed the rotating speed of 20-30% rapidly under the frequency-changing control system effect, its deceleration time is 4-6 second, descaling pump group low speed low-pressure operation.
Good effect of the present invention is: adopt the high-voltage frequency conversion and speed-adjusting technology, system pressure and flow can be regulated automatically according to material, the temperature of incoming slab, simultaneity factor can be finished the buck process in the short period of time, has improved rolling rhythm and has cut down the consumption of energy to greatest extent and improved de-scaling efficient; Adopt variable-frequency control technique to adjust de-scaling pressure, the lifting speed time is foreshortened to 5-8 second, prolonged service life, improved the reliability and stability of system, good energy-conserving effect according to the steel grade situation.
High-pressure hydraulic pump inlet is provided with the diaphragm type jar that saves up strength, and avoids low pressure inlet pipeline impact shock.Because of high-pressure hydraulic pump changes in flow rate when the running of low pressure low-speed running and high-voltage high-speed very big, generally differ 4 to 5 times, and this variation must in seconds be finished, at this moment will produce bigger flow attack to the low pressure supply channel, can cause the pump suction to produce cavitation erosion, pipeline high vibration inadequately when serious.
As by per hour rolling be 11 compact material (the about 20t of substance), rolling pass is 11 roads, every compact de-scaling number of times is 5 times (wherein thick de-scaling 1 time), but adopts two kinds of different control modes whenever to roll 1 compact using electricity wisely like this:
10s×5×(200N/m
2×429m3/h-30N/m
2×100m
3/h)×10
5÷3600
＝1.15×10
8W＝32KWh
Year is saved electricity: 32KWh * 12 * 24 * 365 * 95%=3195648KWh ≈ 3.2 * 10
6KWh
The requirement of different in width blank to de-scaling discharge satisfied in the present invention adopts wide, narrow de-scaling independence and coupling control, reaches energy-saving and cost-reducing target.To add up to 92, single-nozzle flow be 60.37l/min to nozzle during as wide spray, nozzle adds up to 76 during narrow spray, according to actual de-scaling number of times of milling train and time, de-scaling on 30% the rolling time use machine is arranged approximately, then adopt the width spray can economize on electricity every year the control back separately:
(92-76)×60.37l/min×10
-3×60×24×365×30％×200N/m
2×10
5
＝3×10
12W＝0.83×10
6KWh
High-pressure hydraulic pump of the present invention inlet is provided with the diaphragm type jar that saves up strength, avoid low pressure inlet pipeline impact shock, because of high-pressure hydraulic pump changes in flow rate very big (generally differing 4-5 doubly) when the running of low pressure low-speed running and high-voltage high-speed, and this variation must in seconds be finished, thisly will produce bigger flow attack to the low pressure supply channel, can cause the pump suction to produce cavitation erosion, pipeline high vibration inadequately when serious.
The present invention adopts touch-screen and remote computer control, realizes automatic de-scaling operation by L1, L2 level computer system, and pumping plant and de-scaling operation do not need manually-operated.
The present invention adopts SDS type bivalve body impeller symmetric arrangement descaling pump, realizes the reliable and stable controlled non-maintaining use of equipment.
[description of drawings]
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is the technological process block-diagram of prior art of the present invention;
Fig. 2 is a technological process block-diagram of the present invention.
[specific embodiment]
Referring to Fig. 1, a kind of high-pressure water descaling system, equipment configuration comprise mainly that self-cleaning filter 1, diaphragm type save up strength jars 2, bivalve body impeller symmetric arrangement centrifugal pump group 3, the other touch-screen 4 of machine, minimum flow valve group 5, motor-operated control valve and check valve set 6, De-scaling box injection valve group 7, low pressure Prefill valve group 8, narrow de-scaling injection valve group 9, wide de-scaling injection valve group 10, frequency-changing control system 11, L1, L2 level control operation system 12, wide descaling header 13, narrow descaling header 14, efficient descaling jet 15, De-scaling box descaling header 16, turbid circulating water water system 17.
When not de-scaling of system, de-scaling injection valve group 10 is all closed on De-scaling box injection valve group 7 and the machine, minimum flow valve group 5 is opened, bivalve body impeller symmetric arrangement centrifugal pump group 3 under the control of frequency-variable controller 11 and L1, L2 level control operation system 12 with the rotating speed low speed low-pressure operation of 20-30%.
When system's de-scaling, the other hot metal detector of De-scaling box or machine front roller-way detects the steel billet that needs supplied materials, to L1, L2 level control operation system 12 sends position signalling, minimum flow valve group 5 is closed, L1, L2 level control operation system 12 control bivalve body impeller symmetric arrangement centrifugal pump groups 3 and frequency-variable controller 11 rise to rotating speed the required rotating speed of work rapidly, satisfy the de-scaling required pressure, the raising speed time is about 5 seconds, after operating pressure is set up, pneumatic injection valve group 7 of De-scaling box or narrow de-scaling injection valve group 9 or wide de-scaling injection valve group 10 are opened, about 2 seconds of opening time, this moment, steel billet just in time arrived De-scaling box collector 16 or wide descaling header 13 or narrow descaling header 14 positions.
After the steel billet afterbody is by De-scaling box collector 16 or wide descaling header 13 or narrow descaling header 14, hot metal detector detects to L1, L2 level control operation system 12 sends pneumatic injection valve group 7 of position signalling De-scaling box or narrow de-scaling injection valve group 9 or wide de-scaling injection valve group 10 and closes, about 3 seconds of shut-in time, minimum flow valve group 5 is opened, while L1, L2 level control operation system 12 control bivalve body impeller symmetric arrangement centrifugal pump groups 3 and frequency-variable controller 11 drop to rotating speed the rotating speed of 20-30% rapidly, deceleration time is about 5 seconds, bivalve body impeller symmetric arrangement centrifugal pump group 3 low speed low-pressure operations.
The present invention adopts converter technique, width de-scaling control, the big flow SDS of domestic design type bivalve body impeller symmetric arrangement descaling pump, the diaphragm type jar buffer shock-absorbing that saves up strength, technology such as full-automatic de-scaling operation control are in cut deal (volume) milling train high-pressure water descaling system to be used first, and energy consumption index and maintenance cost, automaticity are all reached advanced world standards.
Claims (8)
1, high-pressure water descaling system, comprise filter rinsed and minimum flow valve group, it is characterized in that: after described filter rinsed, be provided with diaphragm type water tank, descaling pump group successively, being provided with on low pressure Prefill valve group, the machine descaling header on de-scaling injection valve group, the machine, efficient descaling jet, De-scaling box de-scaling injection valve group, De-scaling box descaling header and De-scaling box high efficiency nozzle after the described minimum flow valve group successively, realize energy-efficient automatic de-scaling by frequency-changing control system, L1, L2 level control operation system.
2, high-pressure water descaling system according to claim 1 is characterized in that: described descaling pump group is a bivalve body impeller symmetric arrangement.
3, high-pressure water descaling system according to claim 1 is characterized in that: de-scaling injection valve component becomes two groups of controls on the described machine: wide de-scaling and narrow de-scaling, these two groups can be sprayed simultaneously, again can bank injection.
4, according to claim 1 or 3 described high-pressure water descaling systems, it is characterized in that: descaling header, the control of efficient descaling jet and the control of de-scaling injection valve group adapt on the described machine.
5, high-pressure water descaling system according to claim 1 and 2 is characterized in that: the other organic side touch-screen that is provided with of described descaling pump group.
6, high-pressure water descaling system according to claim 1 and 2 is characterized in that: the start-stop of descaling pump group: the start and stop of descaling pump group just often realize by the start-stop menu of clicking host service function chamber L2 level computer.Be in the low-pressure operation state after the descaling pump starting during not de-scaling.
7, high-pressure water descaling system according to claim 1, it is characterized in that: the course of work of described De-scaling box de-scaling is: when the other hot metal detector of De-scaling box front roller-way detects from red base that heating furnace is brought, to host service function chamber L1, L2 level control operation system sends position detection signal, L1, L2 level control operation system sends control instruction: the minimum flow valve group is closed, the descaling pump group rises to rotating speed the required rotating speed of work rapidly under the frequency-changing control system effect, the raising speed time is 4-6 second, after operating pressure and flow foundation, De-scaling box injection valve group is opened, opening time is 1-3 second, this moment, steel billet just in time arrived De-scaling box descaling header position, the beginning de-scaling; When the steel billet afterbody passes through the De-scaling box descaling header, the other hot metal detector of roller-way sends position detection signal to host service function chamber L1, L2 level control operation system behind the De-scaling box, L1, L2 level control operation system send control instruction: De-scaling box injection valve group is closed, shut-in time 2-4 second, stop de-scaling, the minimum flow valve group is opened, and the descaling pump group drops to rotating speed the rotating speed of 20-30% rapidly under the frequency-changing control system effect, deceleration time is 4-6 second, descaling pump group low speed low-pressure operation.
8, high-pressure water descaling system according to claim 1, it is characterized in that: the course of work of de-scaling is on the described machine: host service function chamber L1, L2 level control operation system are according to rolling shedule decision needs de-scaling and de-scaling passage distribution condition, as select strange passage de-scaling, select width de-scaling pattern automatically according to the supplied materials size; According to rolling shedule, in rolling shedule, comprise the information of rolling temperature, steel grade and road sub-distribution, select de-scaling pressure and flow under the different steel grade different temperatures different in width conditions, send the action of instruction control frequency converter then; When rolling pass needs de-scaling, the other hot metal detector of roller-way sends position detection signal to host service function chamber L1, L2 level control operation system before or after the milling train, L1, L2 level control operation system send control instruction: the minimum flow valve group is closed, the descaling pump group rises to rotating speed the required rotating speed of work rapidly under the frequency-changing control system effect, the raising speed time is 4-6 second, after operating pressure and flow foundation, wide or narrow de-scaling injection valve group is opened on the machine, opening time is 1-3 second, steel billet this moment descaling header position on the arrival machine just in time, the beginning de-scaling; When the steel billet afterbody passes through the De-scaling box descaling header, behind the milling train or the other hot metal detector of front roller-way send position detection signal to host service function chamber L1, L2 level control operation system, L1, L2 level control operation system send control instruction: wide or narrow de-scaling injection valve group is closed on the machine, its shut-in time 2-4 second, stop de-scaling, the minimum flow valve group is opened, the descaling pump group drops to rotating speed the rotating speed of 20-30% under the frequency-changing control system effect, deceleration time is 4-6 second, descaling pump group low speed low-pressure operation.
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|---|---|---|---|
| CNB2005100325199A CN100411763C (en) | 2005-12-09 | 2005-12-09 | High-pressure water descaling system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100325199A CN100411763C (en) | 2005-12-09 | 2005-12-09 | High-pressure water descaling system |
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| CN1775399A true CN1775399A (en) | 2006-05-24 |
| CN100411763C CN100411763C (en) | 2008-08-20 |
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| CN101787969B (en) * | 2009-09-04 | 2013-03-27 | 东北电力科学研究院有限公司 | Numerical control system of minimum flow valve of governing feedwater pump and minimum flow control method thereof |
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| CN101787969B (en) * | 2009-09-04 | 2013-03-27 | 东北电力科学研究院有限公司 | Numerical control system of minimum flow valve of governing feedwater pump and minimum flow control method thereof |
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| CN103302117B (en) * | 2013-06-21 | 2015-09-09 | 上海宝钢节能环保技术有限公司 | A kind of frequency-changing control system of single pump de-scaling and control method thereof |
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| CN106903176A (en) * | 2017-03-23 | 2017-06-30 | 中冶赛迪工程技术股份有限公司 | A kind of high pressure water descaling device |
| CN106944482A (en) * | 2017-03-28 | 2017-07-14 | 首钢京唐钢铁联合有限责任公司 | A kind of control method of roughing de-scaling |
| CN108057725A (en) * | 2017-12-29 | 2018-05-22 | 南京钢铁股份有限公司 | A kind of control method of descaling system |
| CN108480401A (en) * | 2018-02-06 | 2018-09-04 | 广东韶钢工程技术有限公司 | High cross rib technology and the methods such as a kind of screw-thread steel |
| CN110404988A (en) * | 2018-04-30 | 2019-11-05 | 宝山钢铁股份有限公司 | A kind of control method reducing temperature drop when producing hot-strip |
| CN108941223A (en) * | 2018-06-13 | 2018-12-07 | 本钢板材股份有限公司 | A kind of hot-rolling descaler motor power saving control method |
| CN112007963A (en) * | 2019-05-31 | 2020-12-01 | 宝山钢铁股份有限公司 | Control method and system for dynamically adjustable descaling pressure of strip steel surface |
| 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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