Summary of the invention
The purpose of this invention is to provide a kind of cooling device, also promptly have the band steel cooling facility for laminar flow and the control cooling means thereof of two cooling zones with cold section and two fine cold-leg of two masters.Another object of the present invention provides a kind of band steel cooling facility for laminar flow with strong cold function.Band steel cooling facility for laminar flow of the present invention mainly is made of the cooling zone that upper stream collector and following spray header are formed, also be provided with side-blown mechanism, described cooling zone comprises main cold section and fine cold-leg two parts, main cold section bottom spray header group by a plurality of upper layer flows collector groups and respective numbers formed, every collector of upper header group all is provided with a by-pass valve control, per two collectors of lower header group are provided with a by-pass valve control, fine cold-leg also is made up of the bottom spray header group of a plurality of upper layer flows collector groups and respective numbers, and on, lower header all is by-pass valve control of a collector, its characteristics be this cooling device by 2 have separately cold section of master and the cooling zone of fine cold-leg, be that preceding cooling zone and cooling zone, back serial connection form, its version is: cold section+fine cold-leg of main cold section+fine cold-leg+master.Another characteristics of band steel cooling facility for laminar flow of the present invention are that the master of described 2 cooling zones is made up of some groups strong cold collector groups and the some groups of cold collector groups of master for cold section, all set up a water inlet pipe that has by-pass valve control on the every collector that so-called strong cold collector group is a laminar flow collector at an upper portion thereof, with the flow of increase cooling water, but and regulated at will.Band steel cooling facility for laminar flow of the present invention all is installed on temperature measuring equipment between the middle part of described preceding cooling zone, cooling zone, front and back and before the coiling machine; The length of the described cooling zone of band steel cooling facility for laminar flow of the present invention is 100~150m, respectively is provided with 20~24 collector groups up and down, and maximum cooling flow is 15000~20000m
3/ h, every group of main cold section upper header is made of 6 bigger collectors of flow, and every group of lower header is made of 12 collectors, and every group of fine cold-leg upper header is made of 12 less collectors of flow, and every group of lower header is made of 12 collectors.The version of described preceding cooling zone is: 3 strong cold group+cold group+3 strong cold group+3 cold sperm groups of 3 masters, the version of back cooling zone is: 3 strong cold group+cold group+3 cold sperm groups of 2 masters.
The control cooling means of band steel cooling facility for laminar flow of the present invention is calculated by setting by computer and realization is calculated in feedback, feedforward, its step is as follows: at first carry out the finish rolling model calculate → according to the requirement of control mode, by the secondary laminar model calculate → through the one-level model calculate → move → make laminar flow equipment by program command control apparatus switch board → commander's magnetic valve action → control power jettron to water → end setup computational process; Finish to gauge temperature instrumentation 11 feeds back to the one-level model with the finishing temperature actual value of being surveyed at any time, and with setting value relatively, if any deviation, then repeat aforementioned calculation, revise the scheme of watering of laminar flow equipment, with realization that guarantees setting value and the raising of cooling off the control temperature accuracy; Chilling temperature detector 12 feedovers detected temperature actual value to the one-level model, repeats aforementioned calculation again, comes the key-course flow device to water; Chilling temperature detector 13 and 14 feeds back to the one-level model with detected temperature actual value, and with setting value relatively, if any deviation, then repeat aforementioned calculation, revise the laminar flow equipment scheme of watering, to guarantee the realization of setting value.
Cooling facility for laminar flow of the present invention is made of 2 cooling zones, front and back, cooled region is long, cooling capacity is strong, flow is big, and each cooling zone is provided with cold by force, main cold-peace cold sperm, can realize cold by force, main cold exchange by valve control, cooling control flexibly, cooling scheme combination is complicated, the utilization rate of equipment and installations height, and the feedback of a plurality of temperature detecting point, feed forward function can improve the cooling control accuracy and reach ± and 20 ℃.This equipment can have multiple type of cooling support, its changeable laminar flow refrigerating function can be realized coiling temperature and cooling velocity control, be specially adapted to specialities such as high strength, high-grade pipe line steel, ferritic steel, even the good trip steel of mouldability and the special cooling requirement of dual phase steel product.
The specific embodiment
By embodiment band steel cooling facility for laminar flow of the present invention and control cooling means thereof are further described with reference to the accompanying drawings.
Band steel cooling facility for laminar flow of the present invention mainly is made of the cooling zone of being made up of the bottom spray header group of several upper layer flows collector groups and respective numbers, and the same with existing cooling facility for laminar flow, be provided with side-blown mechanism in the side of cooling device along cooling zone length.Accompanying drawing 1 is a specific embodiment of the present invention.23 are the band steel among the figure.From accompanying drawing as can be seen, this cooling device by 2 have separately cold section Z of master and the cooling zone of fine cold-leg J, promptly preceding cooling zone A and back cooling zone B serial connection form, its version is: cold section Z+ fine cold-leg of main cold section Z+ fine cold-leg J+ master J.Cooling device of the present invention also is that the length of 2 cooling zone A and B is 100m~150m, respectively is provided with 20~24 collector groups up and down, and maximum cooling flow can reach 15000~20000m
3/ h.The cyclic process of used cooling water is as follows: high-pressure pump → filter → cooling tower → absorbing well, absorption well → supply-water pump → water tank → laminar cooling system → trench → eddy flow well → high-pressure pump.The cooling zone A that accompanying drawing 1 embodiment provides is made of 12 collector groups, its spread pattern is followed successively by: 3 strong cold collector groups 15, a 16+3 main cold collector group 17, a 18+3 strong cold collector group 15, a 16+3 cold sperm collector group 19,20, back cooling zone B is made up of 8 collectors up and down, and its version is: 3 strong cold collector groups 15,16+2 are led cold collector group 17, a 18+3 cold sperm collector group 19,20.The size of the quantity of the length of cooling zone, collector group and size, cooling flow and spread pattern should be determined according to multiple factors such as process for cooling requirement and on-site actual situations.12 collector groups as cooling zone A also can be arranged in 6 strong cold collector groups 15, a 16+3 main cold collector group 17, a 18+3 cold sperm collector group 19,20.
Every group of the upper header group of cold section Z of master of the present invention constitutes by 6 bigger collectors 4 of flow, and every group of lower header group constitutes by 12 collectors 5, shown in accompanying drawing 2 and 3.The every collector 4 of main cold collector group upper header group 17 all is provided with a by-pass valve control 1, sees also accompanying drawing 3.The every collector 4 of strong cold collector group upper header 15 all is provided with two by- pass valve controls 1 and 2, promptly on the basis of main cold collector group 17, set up a water inlet pipe 9 (seeing accompanying drawing 2) that has by-pass valve control 2 for every collector 4, to increase the flow of cooling water, open by-pass valve control 2 for cold by force, closing control valve 2 transfers to main cold.The lower header group 16 and 18 of strong cold still main cold collector group all is that per two collectors 5 are provided with a by-pass valve control 3.The difference of the strong cold collector group of cold section Z of master of the present invention and main cold collector group is exactly to have set up a water inlet pipe 9 on the collector 4 of upper header 15, and achieves cold by force, main cold exchange by by-pass valve control 2.Fine cold-leg J of the present invention forms (seeing accompanying drawing 4) by the bottom spray header group of a plurality of upper layer flows collector groups and respective numbers, and the last cold sperm collector group 19 of fine cold-leg J is made of 12 less collectors 7 of flow, and its underpart collector group 20 is made of 12 collectors 5.Upper and lower part collector 7 and 5 is all controlled by by-pass valve control 8 and 6 separately.For realizing feedback, FEEDFORWARD CONTROL, improve the cooling control accuracy, the present invention is provided with temperature measuring equipment 11 in milling train 21 outlets, is provided with temperature measuring equipment 12 at the middle part of preceding cooling zone A, between cooling zone, front and back A and B, be provided with temperature measuring equipment 13, before coiling machine 22, be provided with temperature measuring equipment 14.
The control cooling means of band steel cooling facility for laminar flow of the present invention is calculated by setting by computer and feedback, feedforward are calculated realization, its control flow following (seeing accompanying drawing 5): at first carry out the finish rolling model and calculate; According to the requirement of control mode, calculate by the complicated laminar model of secondary; Calculate through the one-level model again; By program command control apparatus switch board; By the action of electric control cabinet commander magnetic valve; Further control power jettron action; Laminar flow equipment is watered; End setup is calculated.Finish to gauge temperature measuring equipment 11 feeds back to the one-level model with the finishing temperature actual value of being surveyed at any time, and with setting value relatively, if any deviation, then repeat aforementioned calculation, revise the scheme of watering of laminar flow equipment, with realization that guarantees setting value and the raising of cooling off the control temperature accuracy; Temperature measuring equipment 12 feedovers detected temperature actual value to the one-level model at any time, repeats aforementioned calculation again, comes the key-course flow device to water; Temperature measuring equipment 13 and 14 feeds back to the one-level model with detected temperature actual value at any time, and with setting value relatively, if any deviation, then repeat aforementioned calculation, revise the laminar flow equipment scheme of watering, to guarantee the realization of setting value.
Band steel cooling facility for laminar flow of the present invention is used for every combination property that hot strip rolling mill is rolled back band steel cooling can raising steel band, and production specific use steel grade.Adopt band steel cooling facility for laminar flow of the present invention to realize the following multiple type of cooling by computer control at different levels:
1, the conventional type of cooling: to produce straight carbon steel SS400 is example, need realize the cooling control of outlet temperature, a kind of cooldown rate on request.This computer-chronograph can adopt district cooling, promptly enables cooling zone A, closes cooling zone B, closes the by-pass valve control 2 of strong cold collector group 15, and grow is cold to be main cold, realize main cold+the conventional cooling control of band steel of cold sperm.
2, Cooling Mode: with production flow line steel X70 is example, need realize the cooling control of outlet temperature, cooling fast on request.This computer-chronograph can adopt district cooling, promptly enables cooling zone A, closes cooling zone B, opens the by-pass valve control 2 of strong cold collector group 15, increases the cooling flow, and the main cooling class pipe group that also can enable cooling zone A realizes that the band steel of cold by force+cold sperm cools off control fast.
3, two sections control speed control temperature types of cooling: the HP295 steel grade with the production control yield tensile ratio is an example, need realize the cooling control of 2 temperature, two kinds of cooldown rates on request.This computer-chronograph can adopt the cooling of two districts, promptly enable cooling zone A and cooling zone B simultaneously, adopt the feedback signal of temperature measuring equipment 13 and 14, because cooling velocity is slow, need close the by-pass valve control 2 of the strong cold collector group 15 of two cooling zone A and B, grow is cold to be main cold, controls the discharge of each cooling manifold, control the cooldown rate of each collector, realize cooldown rate v1, temperature spot t1, cooldown rate v2 and temperature spot t2 control.
4, the types of cooling of two sections control speed, temperature control cooling, middle air cooling: with the good trip steel of production automobile industry mouldability, dual phase steel is example, need realize the cooling control of 2 temperature, two kinds of cooldown rates, middle air cooling on request.This computer-chronograph can adopt the cooling of two districts, promptly enable cooling zone A and cooling zone B simultaneously, adopt feedforward, the feedback signal of temperature measuring equipment 12,13 and 14, make the cold collector gauge tap of strong cold-peace master reasonably combined, realize two temperature, how fast, the temperature control of feedforward, feedback.