CN104550275B - A kind of spray vaporization chiller for hot-rolled high-strength reinforcing bar and method - Google Patents
A kind of spray vaporization chiller for hot-rolled high-strength reinforcing bar and method Download PDFInfo
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Abstract
A kind of spray vaporization chiller for hot-rolled high-strength reinforcing bar and method, belong to technical field of steel rolling.Device includes water and air supply system, spray vaporization chiller six sections, infrared radiation thermometer and computer operating system.Wherein, supply water system is made up of water-main, drainage screen, gas main, air accumulator, vavle shelf system, feed pipe and air supply pipe.Each Pressure gauge of vavle shelf system and effusion meter send the pressure supplied water and supply and flow parameter to computer operating system by far distance instrument signal respectively.The spray vaporization chiller for hot-rolled high-strength reinforcing bar of the present invention, the staged being cooled down nozzle packet segmentation by spray vaporization accelerates the type of cooling, control grain refinement and bainite transformation, cause under the premise that martensite ring is formed avoiding tradition Water cooling, significantly improve the intensity of hot-rolled reinforced bar, and obtain required percentage elongation, strong flexor ratio and anti-seismic performance, reduce alloy content and new water consumption, prevent the generation of the rebar surface red rust that Water cooling causes simultaneously.
Description
Technical field
The invention belongs to technical field of steel rolling, particularly relate to a kind of spray vaporization chiller for hot-rolled high-strength reinforcing bar and method [AMethodandDeviceofSprayEvaporativeCooling (SEC) forHot-RolledHigh-StrengthRebar].
Background technology
The commonly used Water cooling method in current countries in the world controls cooling after hot-rolled reinforced bar is rolled, to improve the intensity of reinforcing bar.Belgium Institute of Metallurgical Technology CRM is after developing Tempcore Water cooling technology the seventies[1,2]Europe and British commonwealth of nations mostly adopt this Water cooling method, top layer quenched martensite is carried out tempering (Tempering) by the waste heat utilizing steel core (Core), tempered martensite ring is obtained on the top layer of steel area, and heart portion obtains ferrite-pearlite-bainite, this complex tissue significantly improves reinforcing bar integral yield intensity under full-scale stretching condition and tensile strength level, is used for producing yield strength YS415,460 and 500MPa level hot-rolled high-strength reinforcing bar.
Within 1994, Guangzhou steel mill is while introducing China's Article 1 hot continuous rolling bar unit equipment, the a complete set of Tempcore Water cooling patented technology introducing Belgium CRM, after nearly 1 year field adjustable, put into batch production from May, 1996 use, produce YS415,460 and 500MPa level outlet reinforcing bar according to British Standard BS4449-88[3].Hereafter, domestic many producers adopt similar Water cooling method to produce hot-rolled high-strength reinforcing bar, for instance HRB335, HRB400 and the HRB500 level reinforcing bar product of standard GB/T 1499.2.
But, owing to the method for attachment that reinforcing bar adopts is welding by China's building trade, rather than adopt socket and bolt to connect as Europe and British commonwealth of nations, the hot-rolled reinforced bar of this Water cooling cannot ensure welding performance, martensite ring is easily caused weld crack, and after Thermal Cycle, martensite ring disappears, and significantly reduces the intensity at building structure welding point position, the safe handling of building is caused danger, especially the anti-seismic performance of earthquake prone areas building is had very big threat.Meanwhile, this Water cooling method, very easily causes hot-rolled reinforced bar Surface Creation redness Fe2O3Rusty scale, has had a strong impact on the Acceptable life of Water cooling reinforcing bar and xoncrete structure.
Over 20 years, the top layer martensite ring and the surface redness rusty scale problem that cause due to Water cooling technique are solved always, become the important technical obstacle of puzzlement China hot-rolled high-strength reinforcing bar performance quality, in the urgent need to the novel cooling technology that a kind of applicable hot-rolled high-strength reinforcing bar is uniformly strengthened, rate of cooling can avoided too fast and under the premise of quenched martensite ring appearance, it is effectively improved the yield strength of As rolled reinforcing bar, and obtain required percentage elongation, strong flexor ratio and anti-seismic performance, prevent the formation of rebar surface red rust simultaneously.
Summary of the invention
It is an object of the invention to provide a kind of spray vaporization chiller for hot-rolled high-strength reinforcing bar and method, the problem solving the above-mentioned top layer martensite ring caused due to Water cooling technique and surface redness rusty scale.
Spray vaporization bosher's process and equipment of the present invention includes water and air supply system, spray vaporization chiller six sections, infrared radiation thermometer and computer operating system, sees accompanying drawing 1.Wherein, supply water system is made up of water-main, drainage screen, gas main, air accumulator, vavle shelf system (instrument valve), feed pipe and air supply pipe.Each Pressure gauge of vavle shelf system and effusion meter send the pressure supplied water and supply and flow parameter to computer operating system by far distance instrument signal respectively.
The spray vaporization chiller of the present invention is made up of six cooling sections, includes 15 cooling units, see accompanying drawing 2 in every section.Four spray vaporization cooling nozzles 8 are installed in each cooling unit, these four nozzle layouts facing each other are at grade, between adjacent nozzle mutually at an angle of 90, the longitudinal centre line of the hot-rolled reinforced bar that each jet expansion alignment runs along each section of chiller centrage.
The spray vaporization cooling nozzle of the present invention, is made up of water inlet, air inlet, diversion cavity, mixed aerosol chamber, nut and waterfog head, sees accompanying drawing 3.The water inlet 1 on spray vaporization cooling nozzle top is connected with diversion cavity 3 respectively with air inlet 4.The mixed aerosol chamber 2 that diversion cavity 3 cools down nozzle bottom with spray vaporization is connected, and makes the gentle mixed aerosol under a certain pressure of water.Nut 5 is used for connecting mixed aerosol chamber 2 and waterfog head 6, makes the water smoke formed in mixed aerosol chamber 2 penetrate from shower nozzle 6.
Each spray vaporization cooling nozzle of the present invention is connected with water supply and gas manifold in each section by water inlet and air inlet metal hose respectively, water supply and gas manifold in each cooling section are connected with feed pipe and air supply pipe respectively through water supply valve (W1)～(W6) and air-supplying valve (G1)～(G6), see accompanying drawing 1.
Three infrared radiation thermometers that apparatus of the present invention adopt, including the temperature measurer T in finish to gauge frame exit1, six sections of spray vaporization cooling device exits temperature measurer T2, cold bed porch temperature measurer T3, see accompanying drawing 1, respectively by the finishing temperature T of hot-rolled reinforced bar1, hot-rolled reinforced bar is through the final cooling temperature T after spray vaporization chiller2, hot-rolled reinforced bar enter cold bed time return temperature temperature T3, carry out continuous on-line testing and be sent to computer operating system.
The computer operating system of apparatus of the present invention, receives program, display and control interface program, on-line monitoring operating system, technological parameter and mechanical performance data storehouse etc. including programmable controller PLC, far distance instrument signal.This computer operating system passes through receiving system and display interface, receive and display transmits, from the instrument and meter of vavle shelf system, the far distance instrument signal of coming, the pressure of monitoring water supply and supply and flow parameter, and by on-line monitoring operation sequence to vavle shelf system and each section of valve (W1～W6, G1～G6) send regulating command, control the rate of cooling of spray vaporization cooling parameter and hot-rolled reinforced bar, see accompanying drawing 1.
The spray vaporization cooling nozzle of the present invention, supplying water and Supplying gas condition reaches within the scope of required hydraulic pressure, the water yield, air pressure, tolerance, can produce and obtain required droplet size distribution, make the water droplet of this particle size range (1050～900 DEG C) be instantaneous in the high-temperature final rolling humidity province of hot-rolled reinforced bar to vaporize, and take away substantial amounts of vaporization latent heat of phase change, make hot-rolled reinforced bar obtain the cooling of high efficiency spray vaporization.
The spray vaporization cooling nozzle of the present invention, reaches the hydraulic pressure needed for efficiently cooling down, the water yield, air pressure, tolerance parameter area, is according to cooling down the every test carried out on laboratory installation and test data formulation at spray vaporization.
The structural representation of apparatus of the present invention is provided by accompanying drawing 4, and its overall structure is made up of spray vaporization cooling section (six), air supply system, water system, spray vaporization nozzle, infrared radiation thermometer and computer operating system.Wherein, spray vaporization chiller includes: six cooling sections 40 being sequentially connected with, and each cooling section is mounted with 15 cooling units 41, and each cooling unit is configured with four spray vaporization nozzles 8.The water and air supply system of package unit is connected with in turn: water-main 42, gas main 43, air accumulator 44, filter 45, vavle shelf system 46, water supply arm 47, gas manifold 48, penstock 49, air valve 50, circumferential weld sparge pipe 51, package unit monitor control system include temperature measurer 52～54, computer 55, Programmable Logic Controller (PLC) 56.
Apparatus of the present invention are in the porch of each cooling unit 41 of each cooling section 40, installation settings is once atomized cooling circumferential weld sparge pipe 51, make the stratiform current with certain speed and pressure and the airflow layer mixed aerosol around high-speed cruising reinforcing bar, form primary atomization cooling zone, to make up (V at a high speedR=7.0～12.5m/s) high velocity air layer produced by the reinforcing bar that runs is to the secondary-atomizing of water smoke and elegant dissipation effect.
The computer 55 on-line monitoring operating system of apparatus of the present invention, adopt " hot-rolled high-strength reinforcing bar spray vaporization cooling technology controlling and process " software program that Programmable Logic Controller (PLC) 56 is write, by showing and control that every technical parameter that spray vaporization is cooled down full technical process by interface is adjusted and controls.
Apparatus of the present invention also include: each cooling section extracts the vapour collect cover used by water vapour, dry pipe and the air exhauster that spray vaporization cooling produces, and to get rid of the steam that each spray vaporization cooling section produces, improve heat exchange and cooling effectiveness.
The present invention relates to a kind of method that spray vaporization for hot-rolled high-strength reinforcing bar unit cools down.First feature of the method is, different from the method for the Water cooling continued to use for many years both at home and abroad and surface layer quenching, but adopt the multisection type packet spray vaporization cooling means of apparatus of the present invention, hot-rolled reinforced bar carries out stepped acceleration cool down, making reinforcing bar in the process by each section of chiller, the minimum temperature on its surface is not less than martensite point MSTemperature, makes surface of reinforced bar that quenching and martensitic phase transformation not occur, but accelerates piecemeal to be cooled to Bainite Region and ferrite area from high temperature austenite district.Therefore, this new method not only avoid top layer quenching and martensite ring produced by tradition Water cooling method, and avoid being formed of the lattice shear, high dislocation density, volumetric expansion and the surface strain layer that are caused by surface martensite phase transformation, thus avoid strain induced martensite oxidation, stress corrosion and surface Fe that the rebar surface thus caused returns in temperature process after Water cooling2O3The generation of red rust.
The spray vaporization cooling means of the present invention, its second feature is, different from the mode of the big flow circulating water that tradition Water cooling and top layer quenching adopt, this method makes full use of the phase transformation latent heat of vaporization λ=540cal/g ultimate principle far above specific heat of water Cp=1cal/g DEG C of water, its cooling mechanism is no longer nuclear boiling and the film boiling of tradition water-cooled, but spray vaporization cooling；By controlling droplet size distribution, improve Vaporizing cooling ratio and heat exchange efficiency, make hot-rolled reinforced bar obtain packet segmentation staged and accelerate cooling, control each section of final cooling temperature at the martensite point above T of temperature simultaneouslyC.T>MSThe utilization rate of cooling medium water is significantly improved on the one hand than tradition Water cooling method, decrease circulating load and the consumption of water, rate of cooling and the phase-change organization of hot-rolled reinforced bar has been efficiently controlled on the other hand than tradition Water cooling method, the intensity improving reinforcing bar is changed, it is thus achieved that good percentage elongation, strong flexor ratio, anti-seismic performance and the solderability adapted with high intensity by crystal grain thinning, bainite and sorbite.
The spray vaporization cooling means of the present invention, its the 3rd feature is, while adopting above-mentioned packet segmentation staged acceleration cooling method, not only in basic skills and coolant mechanism, entirely different with the hot-rolled reinforced bar cooling means of tradition Water cooling and top layer quenching, and in the adjustment of the droplet size scope required for spray vaporization cooling, high-speed cruising feature according to hot-rolled reinforced bar, adopt two kinds of regulation and control methods adapting to field condition: change the pressure supplied water and supply and flow on the one hand, it it not the technological parameter of the on-the-spot unit of test data setting fully according to laboratory installation, and allow for the high velocity air layer the surrounding high-speed cruising reinforcing bar secondary-atomizing effect to water fog particle, and the impact of the droplet size on actual ejection to rebar surface, have adjusted this device at the scene supply water supply technological parameter；On the other hand, it is provided with primary atomization circumferential weld sparge pipe at each cooling unit, makes full use of the atomizing of high velocity air layer, improve cooling effectiveness, and significantly reduce and compressed-air actuated make consumption.
Owing to the present invention has three features of above-mentioned spray vaporization cooling means, make this device while making full use of and improving spray vaporization cooling effectiveness, hot-rolled reinforced bar is controlled with carrying out packet segmentation cooling, regulates and controls each section of rate of cooling and minimum chilling temperature at the martensite point above T of temperatureC.T>MS, it is to avoid surface of reinforced bar quenched martensite ring that traditional Water cooling method causes and surface redness Fe2O3The formation of rusty scale, it is ensured that the high intensity of reinforcing bar, good percentage elongation, strong flexor ratio, anti-seismic performance, solderability and every serviceability, and reduce alloy content and new water consumption.
The main operational steps of the inventive method is:
First, parameter area by the pressure of vavle shelf system water supply and supply with Flow-rate adjustment to technological requirement, check simultaneously supply water and the Pressure gauge of air supply system and meter readings and computer operation interface display reading whether precisely consistent, and after the aqueous vapor pressure/flow technological parameter stably reaching setting requires, start hot-rolled reinforced bar is carried out online spray vaporization cooling.
Secondly, from the hot-rolled reinforced bar that mm finishing mill unit finish to gauge frame continuous high speed shuts out, with VRThe speed of service of=7.0～12.5m/s sequentially enters and passes through the first paragraph of this spray vaporization chiller to the 6th section, and its surface temperature is from finishing temperature T1(1000 DEG C ± 50 DEG C) stepwise decrease to through the final cooling temperature T after spray vaporization chiller2, and return warm to T when entering cold bed3.By setting and regulate the pressure/flow parameter of aqueous vapor, control to be ejected into the water droplet particle size distribution of rebar surface, make water smoke instant vaporization and take away a large amount of latent heat of vaporization, making hot-rolled reinforced bar reach final cooling temperature T in one second to three second2< 600 DEG C of goal of.
3rd, the difference according to hot-rolled reinforced bar specification (diameter), adopt different hydraulic pressure/air pressure and the water yield/tolerance proportioning.Wherein: hydraulic pressure regulates in 0.2MPa to 1.2MPa scope, air pressure regulates in 0.0MPa to 0.8MPa scope, the water yield is at 20m3/ h to 200m3Within the scope of/h, adjustment, tolerance are at 0 to 3600m3Regulate within the scope of/h, be ejected into the surface of reinforcing bar from jet expansion after obtaining the water fog particle of different grain size diameter and cool down；
4th, first cooling unit of the reinforcing bar traverse first group that high temperature and high speed runs, the water smoke that four nozzles being arranged symmetrically with in this unit eject different grain size and diameter makes reinforcing bar cool off on surface when by this region, subsequently into the bellmouth of fixed nozzle carrying out return temperature, return the reinforcing bar after temperature to sequentially pass through second unit and cool down, subsequently into second unit return temperature bellmouth in, again and again return temperature bellmouth through 15 cooling unit coolings and 15 successively, so far the cooling procedure of 0.3s to 0.6s in first group of spray vaporization chiller is completed；
5th, the reinforcing bar that high temperature and high speed runs is after have passed through first group of spray vaporization chiller, through a telescopic joint device being about 1000mm, carry out in this connecting device less than 0.14s return temperature after enter in second group of water smoke gasification refrigerating mechanism, repeat the process of the 4th step；
6th, it is repeated in the 4th step and the 5th step until proceeding to after the 6th group of water mist vaporizing device cool down, the hot-rolled reinforced bar of high-speed cruising, by the staged acceleration cooling method of this packet segmentation, make surface temperature within 1s～3s time, from finishing temperature T1=1000 DEG C ± 50 DEG C are cooled to final cooling temperature T2< less than 600 DEG C.
7th, monitor finishing temperature T by computer operation interface1, final cooling temperature T2, cold bed return temperature temperature T3, suitably regulate the water supply of each cooling section and the pressure of supply and flow, at each key point temperature T1、T2、T3After stable, control each section of aqueous vapor pressure stability of flow at required parameter level.
Finally, technological parameter in computer operating system and mechanical performance data storehouse, according to item material and technological parameters such as the reinforcing bar chemical composition collected, specification (diameter), rolling mill practice and chilling temperatures, the tissue of prediction steel and As rolled mechanical property, if the tissue of steel requires different with final mechanical property from technology, the adjustment valve supplied water with air supply system can be fed back to by computer, the technological parameters such as the pressure/flow of adjustment aqueous vapor, make the performance of hot-rolled reinforced bar reach technical requirement.
The primary operational functional character of apparatus of the present invention is, feed pipe and the hydraulic pressure of air supply pipe, the water yield, air pressure, tolerance is regulated by vavle shelf system (instrument valve), regulated aqueous vapor pressure and the flow of each cooling section by each section of water supply valve (W1)～(W6) and air-supplying valve (G1)～(G6), control droplet size distribution and the spray vaporization cooling effectiveness of each section of inner nozzle injection.
Accompanying drawing explanation
Fig. 1 is the technology arrangement schematic diagram of the spray vaporization chiller for hot-rolled high-strength reinforcing bar unit of the present invention.
Fig. 2 is the wherein structural representation of any one section of the spray vaporization chiller for hot-rolled high-strength reinforcing bar unit of the present invention.
Fig. 3 is the schematic diagram of the spray vaporization cooling nozzle for hot-rolled high-strength reinforcing bar of the present invention.Wherein, water inlet 1, mixed aerosol chamber 2, diversion cavity 3, air inlet 4, nut 5, waterfog head 6.
Fig. 4 is the spray vaporization chiller structural representation for hot-rolled high-strength reinforcing bar of the present invention.This device is made up of spray vaporization cooling section (six), air supply system, water system, spray vaporization nozzle, infrared radiation thermometer and computer operating system.Wherein, what spray vaporization chiller was sequentially connected with has: six cooling sections 40, and each cooling section is mounted with 15 cooling units 41, and each cooling unit is configured with four spray vaporization nozzles 8.The water and air supply system of package unit is connected with in turn: water-main 42, gas main 43, air accumulator 44, filter 45, vavle shelf system 46, water supply arm 47, gas manifold 48, penstock 49, air valve 50, circumferential weld sparge pipe 51, package unit monitor control system include temperature measurer 52～54, computer 55, Programmable Logic Controller (PLC) 56.
Fig. 5 is the metallographic structure that the spray vaporization cooling means adopting the present invention is controlled the φ 25mm hot-rolled high-strength HRB400E antidetonation level reinforcing bar of cooling with device.
Detailed description of the invention
Fig. 1 to Fig. 5 is a kind of detailed description of the invention of the present invention, illustrates as follows with regard to its ultimate principle, technical characteristic, actual motion and control method.
As shown in Figure 1, the spray vaporization chiller technology arrangement schematic diagram of the hot-rolled high-strength reinforcing bar unit of the present invention, specifically includes that supply vavle shelf system such as a set of water supply being made up of water-main, drainage screen, gas main, air accumulator, vavle shelf (valve, Pressure gauge, effusion meter), feed pipe, air supply pipe etc.；A set of six sections of 90 unit are cooled down nozzle by spray vaporization and configure the spray vaporization chiller constituted, and as shown in Figure 2, any one nozzle arrangements is as shown in Figure 3 for any of which one segment structure；A set of computer on-line monitoring operating system being made up of infrared radiation thermometer, remote signal instrument, programmable controller PLC, display and control interface program, technological parameter and mechanical performance data storehouse.
As shown in the vavle shelf system of Fig. 1 and computer operating system, first by middle limit in range of accommodation of the water supply of vavle shelf system and supply gas pressure and flow set, check that whether the Pressure gauge supplied water and supply and effusion meter dial reading and computer operation interface display reading be precisely consistent simultaneously, and after the aqueous vapor pressure/flow technological parameter stably reaching setting requires, start hot-rolled reinforced bar is carried out online spray vaporization cooling.
Such as the finish to gauge frame of Fig. 1, temperature measurer T1, temperature measurer T2, temperature measurer T3Cool down shown in line with the 1st section to the 6th section of spray vaporization, from the hot-rolled reinforced bar that finish to gauge frame continuous high speed shuts out, with VRThe speed of service of=7.0～12.5m/s sequentially enters and passes through the first paragraph of this spray vaporization chiller to the 6th section, and its surface temperature is from finishing temperature T1(1000 DEG C ± 50 DEG C) stepwise reduce, until the final cooling temperature T after traverse spray vaporization chiller2, it is then passed through transfer roller and flying shear and returns when entering cold bed warm to T3.By computer monitoring and operating system, set and suitably regulate the hydraulic pressure of each cooling section, the water yield, air pressure, tolerance parameter, regulate and control to be ejected into the water droplet particle size distribution of rebar surface, cooling effectiveness and hot-rolled reinforced bar rate of cooling, make water smoke instant vaporization and take away a large amount of latent heat of vaporization, making hot-rolled reinforced bar reach final cooling temperature T in one second to three second2< 600 DEG C of goal of.
Wherein shown in a segment structure schematic diagram of spray vaporization chiller such as the hot-rolled high-strength reinforcing bar unit of Fig. 2, it is characterised in that each section of 15 cooling units being made up of 15 groups of nozzles are constituted, and hot-rolled reinforced bar is (T within the scope of higher finishing temperature1=1000 DEG C ± 50 DEG C) enter the first cooling section, when the reinforcing bar of high-speed cruising is through first cooling unit, the water smoke that four nozzles being arranged symmetrically with in this unit eject makes reinforcing bar surface when by this region be accelerated cooling, subsequently into the bellmouth of fixed nozzle returns temperature in short-term, cool down then across second unit, and enter in the bellmouth of second unit and return temperature, successively repeatedly through the cooling of 15 cooling units with of short duration return temperature, complete the cooling procedure of 0.3s to 0.6s in first paragraph spray vaporization chiller；Pass through the second identical cooling section of structure subsequently to the 6th cooling section, carry out the staged being grouped stage by stage and accelerate cooling, control each section of minimum chilling temperature and final cooling temperature is not less than martensite transformation temperature T2>MS；At each key point temperature T1、T2、T3After stable, control each section of aqueous vapor pressure stability of flow at required cooling technique parameter level.
The spray vaporization chiller structural representation for hot-rolled high-strength reinforcing bar such as Fig. 4, its primary operational functional character is, feed pipe and the hydraulic pressure of air supply pipe, the water yield, air pressure, tolerance is regulated by the instrument valve (46) of computer operating system (55) and vavle shelf system, by each section of the first to the 6th water supply valve (49) installed and the first to the 6th air-supplying valve (50), regulate aqueous vapor pressure and the flow of each cooling section, control the rate of cooling of the droplet size distribution of each section of inner nozzle injection, spray vaporization cooling effectiveness and hot-rolled reinforced bar.
Adopt hot-rolled high-strength reinforcing bar spray vaporization cooling means as shown in Figure 1, Figure 2, Figure 3 and Figure 4 and the device of the present invention, replace traditional Water cooling and top layer quenching technical, the yield strength making ideal format φ 22～25mm hot rolling HRB400 level reinforcing bar is stable within the scope of YS=440～460MPa, meets all technical requirement of GB1499.2-2007.After ten days natrual ageing, mechanical properties test result shows, its yield strength is YS=429～431MPa, tensile strength is TS=592～609MPa, percentage elongation A=22～23%, strong flexor ratio TS/YS=1.37～1.42, meet anti-seismic performance index and the requirement of HRB400E level reinforcing bar, its microscopic structure is ferrite-pearlite and the part bainite structure of refinement, is absent from any martensitic structure, as shown in Figure 5 in steel area., all there is not surface redness Fe in the hot-rolled high-strength reinforcing bar of all employing spray vaporization chillers and method2O3Rusty scale.
Claims (6)
1. the spray vaporization chiller for hot-rolled high-strength reinforcing bar, it is characterised in that this device includes water and air supply system, spray vaporization chiller, infrared radiation thermometer and computer operating system；Wherein, water and air supply system is made up of water-main, drainage screen, gas main, air accumulator, vavle shelf system, feed pipe and air supply pipe；Each Pressure gauge of vavle shelf system and effusion meter send the pressure supplied water and supply and flow parameter to computer operating system by far distance instrument signal respectively；
Spray vaporization chiller is made up of six cooling sections, 15 cooling units are included in each cooling section, 4 spray vaporization cooling nozzles are installed in each cooling unit, these 4 nozzle layouts facing each other are at grade, between adjacent nozzle mutually at an angle of 90, the longitudinal centre line of the hot-rolled reinforced bar that each jet expansion alignment runs along each section of chiller centrage；
Three infrared radiation thermometers adopted, including the temperature measurer T1 in finish to gauge frame exit, the temperature measurer T2 in spray vaporization chiller the 6th cooling section exit, cold bed porch temperature measurer T3, respectively by the finishing temperature T1 of hot-rolled reinforced bar, hot-rolled reinforced bar through the final cooling temperature T2 after spray vaporization chiller, hot-rolled reinforced bar enter cold bed time return temperature temperature T3, carry out continuous on-line testing and be sent to computer operating system.
2. the spray vaporization chiller for hot-rolled high-strength reinforcing bar as claimed in claim 1, it is characterised in that spray vaporization cooling nozzle, is made up of water inlet, air inlet, diversion cavity, mixed aerosol chamber, nut and waterfog head；The water inlet (1) on spray vaporization cooling nozzle top is connected with diversion cavity (3) respectively with air inlet (4)；The mixed aerosol chamber (2) that diversion cavity (3) cools down nozzle bottom with spray vaporization is connected, and makes the gentle mixed aerosol under stress of water；Nut (5) is used for connecting mixed aerosol chamber (2) and waterfog head (6), makes the water smoke formed in mixed aerosol chamber (2) penetrate from shower nozzle (6)；
Spray vaporization cooling nozzle is connected with water supply and gas manifold in each cooling section by water inlet and air inlet metal hose respectively, and water supply and gas manifold in each cooling section are connected with feed pipe and air supply pipe respectively through the first penstock (W1)～the 6th penstock (W6) and the first air valve (G1)～the 6th air valve (G6).
3. the spray vaporization chiller for hot-rolled high-strength reinforcing bar as claimed in claim 1, it is characterized in that, computer operating system, receives program, on-line monitoring operating system, technological parameter and mechanical performance data storehouse including programmable controller PLC, display and control interface program, far distance instrument signal；Computer operating system is by receiving system, display interface and regulator control system, the rate of cooling of monitoring and control spray vaporization cooling parameter and hot-rolled reinforced bar.
4. the spray vaporization chiller for hot-rolled high-strength reinforcing bar as claimed in claim 1, it is characterized in that, this device also includes: each cooling unit porch in each cooling section, installation settings is once atomized cooling circumferential weld sparge pipe, make the stratiform current with certain speed and pressure and the airflow layer mixed aerosol around high-speed cruising reinforcing bar, and form primary atomization cooling zone, in order to make up each group of nozzle water smoke by high speed VRThe loss that the circling gas flow layer secondary-atomizing of=9.5-12.5m/s operation reinforcing bar drive and elegant dissipation cause.
5. the spray vaporization chiller for hot-rolled high-strength reinforcing bar as claimed in claim 1, it is characterized in that, this device also includes: each cooling section extracts the vapour collect cover used by water vapour, dry pipe and the air exhauster that spray vaporization cooling produces, to get rid of the water vapour that each spray vaporization cooling section produces, improve heat exchange and cooling effectiveness.
6. one kind adopts the method that hot-rolled high-strength reinforcing bar is carried out spray vaporization cooling by device described in claim 1, it is characterised in that processing step is as follows:
(1) pressure supplied by vavle shelf system water supply and Flow-rate adjustment, to technological requirement, the difference according to hot-rolled reinforced bar format diameter, adopt different hydraulic pressure/air pressure and the water yield/tolerance proportioning；Wherein: hydraulic pressure regulates within the scope of 0.2～1.2MPa, air pressure regulates within the scope of 0.0～0.8MPa, the water yield is at 20～200m3Within the scope of/h, adjustment, tolerance are at 0～3600m3Regulate within the scope of/h, check simultaneously supply water and the Pressure gauge of air supply system and meter readings and computer operation interface display reading whether precisely consistent, and after the aqueous vapor pressure/flow technological parameter stably reaching setting requires, hydraulic pressure 0.6 ± 0.1MPa, air pressure 0.6 ± 0.1MPa, the water yield 100 ± 10m3/ h, tolerance 1800 ± 100m3Start hot-rolled reinforced bar is carried out online spray vaporization cooling within the scope of/h；
(2) temperature at the reinforcing bar of 1000 ± 50 DEG C from last rolling mill of mm finishing mill unit to run to six sections of spray vaporization chillers more than 7m/s speed；
(3) reinforcing bar run the first cooling section in spray vaporization chiller successively, to the 6th cooling section traverse, the difference according to bar diameter, adopts different hydraulic pressure/air pressure and the water yield/tolerance proportioning；Wherein: hydraulic pressure regulates in 0.2MPa to 1.2MPa scope, air pressure regulates in 0.0MPa to 0.8MPa scope, the water yield is at 20m3/ h to 200m3Within the scope of/h, adjustment, tolerance are at 0 to 3600m3Regulate within the scope of/h, be ejected into the surface of reinforcing bar from jet expansion after obtaining the water fog particle of different grain size diameter and cool down；
(4) first cooling unit of reinforcing bar traverse the first cooling section run, four nozzles being arranged symmetrically with in this unit eject the water smoke of different grain size and diameter, reinforcing bar is cooled off on surface when by this region, subsequently into the bellmouth of fixed nozzle carrying out return temperature, return the reinforcing bar after temperature to sequentially pass through second cooling unit and carry out water smoke cooling, and subsequently enter second cooling unit return temperature bellmouth in carry out returning temperature, repeatedly cool down through the staged of 15 cooling units so successively and return temperature with 15 discontinuous returning temperature bellmouth, the cooling procedure of the 0.3s to 0.6s so far completed in the first cooling section in this spray vaporization chiller；
(5) reinforcing bar run is after the spray vaporization that have passed through the first cooling section cools down, telescopic joint device through a long 1000mm, this connecting device carries out less than 0.14s return temperature after, enter into the second cooling section and carry out spray vaporization cooling, the discontinuous of the staged cooling and 15 bellmouths that also pass through 15 cooling units returns temperature, repeats the cooling procedure of step (4)；
(6) successively in the spray vaporization chiller of the first cooling section to the 6th cooling section, repeat step (4) and step (5), until reinforcing bar is by after the spray vaporization cooling of the 6th cooling section, make the rebar surface temperature of operation in 1s to 3s, by this staged cooling means, it is reduced to T by 1000 ± 50 DEG C3<600℃。
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| CN106391734B (en) * | 2016-08-17 | 2017-12-26 | 钢铁研究总院 | A kind of piece-wise step type cooling device for hot-rolled high-strength reinforcing bar |
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| CN111057836B (en) * | 2019-12-31 | 2021-03-09 | 钢铁研究总院 | Control method for cooling path of high-strength steel bar |
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| CN113528775A (en) * | 2021-07-29 | 2021-10-22 | 江苏联峰实业有限公司 | Spray quenching device and application thereof in simulating lead bath heat treatment to obtain sorbite structure |
| CN114178309B (en) * | 2021-11-15 | 2022-09-30 | 广州广钢新材料股份有限公司 | Controlled cooling method and device for hot-rolled ribbed steel bar |
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