CN102424902B - Vapor cooling system for use in offline heat treatment of thin medium and thick plates - Google Patents
Vapor cooling system for use in offline heat treatment of thin medium and thick plates Download PDFInfo
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- CN102424902B CN102424902B CN 201110388052 CN201110388052A CN102424902B CN 102424902 B CN102424902 B CN 102424902B CN 201110388052 CN201110388052 CN 201110388052 CN 201110388052 A CN201110388052 A CN 201110388052A CN 102424902 B CN102424902 B CN 102424902B
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Abstract
The invention discloses a vapor cooling system for use in offline heat treatment of thin medium and thick plates, which comprises a water supply system, an air supply system, vapor spray nozzles and a control system, and is characterized in that: the vapor spray nozzles are symmetrically arranged above and below a rollway gap along the conveying rollway, the upper spray nozzle and an upper rollway are fixed on a movable upper frame, and the lower spray nozzle is fixed on a fixed frame; the water and air supply systems are led into the vapor spray nozzles by a shunt water collecting header and a shunt air collecting header respectively; a water supply pipe is provided with a valve, a flow meter and a regulating valve and is used for providing stable and reliable cooling water into an inner water storage cavity in the spray nozzle from the side of the spray nozzle; and the control system consists of an experience management system and a PLC system, the experience management system makes a vapor cooling policy and cooling procedure and sends the cooling procedure to the PLC system to execute the cooling procedure, and the PLC system realizes the regulation of the intensity of cooling of the spray nozzle and the regulation of the state of water spraying. The vapor cooling system can solve the nonuniform cooling problem aroused by the high-pressure water jet cooling in the conventional thin medium and thick plate offline quenching.
Description
Technical field
The invention belongs to equipment for Heating Processing and Technology field, relate to a kind of thin specification plate of moderate thickness vapor cooling system for use in offline heat treatment.
Background technology
At present, (4mm ~ 8mm) shrend is mainly taked in off-line quenching (solid solution) to thin specification plate of moderate thickness, utilizes high-pressure water jet to impact surface of steel plate, produces the enhanced heat exchange effect.This type of cooling is very big for thin specification steel plate instantaneous cooling intensity, easily produces inhomogeneous cooling and plate shape problem, has reduced product qualified rate, has strengthened the difficulty that production process is controlled.Meanwhile, steam fog is cooling in the widespread use of metallurgy industry every field.Steam fog is cooling multiplex on the cooling and converter body of slab caster two cold section is cooling, in the Heavy Plate Production field, is mainly used in intermediate blank cooling and roll rear control cooling aspect.As the part of control cooling system, steam fog is cooling, and the aspect plays an important role enhancing product performance, improve surface quality, enhance productivity etc.Cooling plate of moderate thickness off-line (solid solution) field of quenching be transplanted to of steam fog, utilize that its cooling uniformity is good, the little characteristics of the direct jet impulse of cooling intensity higher pressure water, carrying out thin specification plate of moderate thickness, to quench that (solid solution) process will be a practical way.Yet in thin specification plate of moderate thickness quenching (solid solution) field, it is blank that the application of vapor cooling system for use still belongs at present.
Patent CN201534173U discloses a kind of plate mill and has rolled rear vapor cooling device, rolls with similar that rear vapor cooling device compares that cooling power is stronger, atomizing effect is better, the cooling rate regulation range is wider.But the purpose of this device is that control is cooling, no matter requiring still from cooling intensity with the thin specification plate of moderate thickness quenching (solid solution) that the present invention relates to, cooling uniformity requires all to have larger gap, and this device control device is less, be not enough to reach the requirement that cooling parameter is accurately controlled and cooling path is controlled, with to the present invention relates to content irrelevant.
Patent CN101642780A discloses a kind of intermediate blank cooling system and cooling control technique, between roughing mill and finishing mill, vapor cooling device is set, and controls the intermediate blank process of cooling by controlling the collector water spray.This system automation degree is higher, and detection means is more complete.Because the main purpose of this system design is to reduce the intermediate blank temperature, do not need accurate temperature drop rate to control and steel-plate shape control, therefore, designs of nozzles is simpler, does not too much consider the cooling uniformity problem.No matter all larger with difference of the present invention from purpose of design, embodiment or environment for use this invention is.
Patent CN201437129U discloses a kind of cold rolling normalizing steam fog formula cooling system, and water flow sensor, Water flow adjusting valve and discharge adjusting apparatus are installed on every row's water-cooled tube, utilizes computer accurately to control the water yield, realizes that flow controls along separate routes.This system is placed on the water yield with major objective and accurately controls, the less technological innovation that relates to nozzle arrangements and the formulation of cooling strategy, and the technical field that patent relates to is narrower, and is little with relation of the present invention.
Summary of the invention
The purpose of this invention is to provide a kind of thin specification plate of moderate thickness vapor cooling system for use in offline heat treatment, atomizing effect is good, cooling uniformity is good, the cooling intensity regulation range is wide, cooling parameter is controlled accurately and cooling strategy can be provided, and can solve inhomogeneous cooling and plate shape problem that the cooling generation of high-pressure water jet is adopted in present thin specification plate of moderate thickness off-line quenching (solid solution).
a kind of thin specification plate of moderate thickness vapor cooling system for use in offline heat treatment, comprise water supply, air feed, steam fog nozzle and Controlling System, it is characterized in that, the steam fog nozzle is arranged symmetrically with between the roller-way gap up and down along rollgang, upper spray nozzle and upper roller-way are fixed on mobile upper frame, and lower nozzle is fixed on fixed frame, supply water, the gas system catchments through shunting respectively, air pipe enters the steam fog nozzle, open and close valve is set on water-supply line, under meter, variable valve, provide stable, controlled water coolant by nozzle side to importing in nozzle internal layer water storage cavity, it is constant that airing system provides, controlled cooling air is imported in the outer air storing cavity of nozzle by nozzle ends, water and air with certain pressure and initial velocity forms water smoke after nozzle exit mixing fragmentation, water smoke sprays along gap nozzle with certain initial velocity and jet angle, the high speed droplet pierces through the surperficial steam film of high-temperature steel plate, with the direct liquid-solid heat exchange of surface of steel plate, Controlling System is comprised of experience management system and PLC system, the experience management system is formulated steam fog cooling strategy and cooling rules, and cooling rules are issued to the PLC system carry out, the PLC system realizes that by regulating water supply supply gas pressure ratio and throughput ratio, up and down nozzle water-supply quantity ratio, upper spray nozzle jet length, nozzle ejection angle, up and down and plate speed the nozzle cooling intensity is regulated and the water spray status adjustment.
a kind of thin specification plate of moderate thickness vapor cooling system for use in offline heat treatment, it is characterized in that, waterworks comprises shunting header (1), divide water-supply pipe (22), nozzle water-in (15), nozzle (7 ') under steam fog upper spray nozzle (7) and steam fog, form the pressure of supply water closed loop control system by being arranged on pressure transmitter (16) in shunting header (1) and the variable valve (18) on pressure release pressurize pipeline (17), control by PID and realize that hydraulic pressure adjusts in real time, pressure of supply water is 0.2MPa ~ 0.4MPa, water temperature is 0 ℃ ~ 32 ℃, be arranged under meter (3) on water-supply line and flow control valve (4) and form the flow closed loop control system, control by Fuzzy-PID and realize that the water yield adjusts in real time.
A kind of thin specification plate of moderate thickness vapor cooling system for use in offline heat treatment, it is characterized in that, airing system is comprised of steam fog blower fan (5), fan frequency converter (6) and supply air line (11), the cooling air of supplying with enters air storing cavity by shunting effuser (8), under meter (9), open and close valve (10), metallic hose (12), nozzle air intake (25) successively, and supply gas pressure is 4KPa ~ 8KPa; For guaranteeing that airing system provides constant pressure air by set(ting)value, form the supply gas pressure closed loop control system by the pressure transmitter (19) and the steam fog fan frequency converter (6) that are arranged on the shunting effuser, control by PID and realize that supply gas pressure adjusts in real time; Be fine adjustment air feed total amount, form the gas supply flow closed loop control system by the under meter (9) and the steam fog fan frequency converter (6) that are arranged on supply air line, control by Fuzzy-PID and realize that air demand adjusts in real time.
A kind of thin specification plate of moderate thickness vapor cooling system for use in offline heat treatment, it is characterized in that, the structure of steam fog nozzle: the long 2.8m ~ 3.5m of gap nozzle, outer air storing cavity (23) is around being wrapped in internal layer water storage cavity (24) outside, and two cavitys are place, gap UNICOM below nozzle only; Damping system (27) is comprised of in internal layer water storage cavity (24) two-layer sieve plate, and close influent side sieve plate permeable hole is sparse, the aperture is large, and close water outlet side sieve plate permeable hole is dense, the aperture is little; Internal layer water storage cavity (24) gap nozzle is positioned at the vertical margin medullary ray, and the wide 2mm of water outlet seam goes out air cleft and is symmetrically arranged in water outlet gap nozzle outer rim both sides, and each goes out the wide 1.5mm of air cleft.
A kind of thin specification plate of moderate thickness vapor cooling system for use in offline heat treatment, it is characterized in that, the upper spray nozzle (7) and the upper roller-way (14) that are fixed on mobile upper frame (20) move up and down with mobile upper frame (20) by lifting motor (21), regulate the upper spray nozzle jet length, upper spray nozzle jet length regulation range is 30mm ~ 400mm, and lower nozzle (7 ') jet length is fixed as 40mm.
A kind of thin specification plate of moderate thickness vapor cooling system for use in offline heat treatment, it is characterized in that, the steam fog nozzle is parallel to rollgang and arranges 4 ~ 6 groups continuously, every group of nozzle comprises two nozzles that the up and down is corresponding, upper spray nozzle (7) is arranged between roller-way (14), lower nozzle (7 ') is arranged between lower roller, and rollgang speed is adjustable, and regulation range is 0.05m/s ~ 0.6m/s.
a kind of thin specification plate of moderate thickness vapor cooling system for use in offline heat treatment, it is characterized in that, the experience management system is divided into 4 cooling sections with the steam fog of the many groups in equipment nozzle along the steel plate working direction, be followed successively by precooling zone, conventional cooling section, strengthen cooling section and time reinforcement cooling section, by formulating steam fog cooling strategy and cooling rules, realize that cooling path is controlled and final cooling temperature is controlled, cooling strategy comprises that setting respectively organizes the nozzle open and-shut mode, the nozzle cooling intensity, nozzle water spray state and each cooling zone cooling time, cooling rules comprise that each cooling section opens and closes, the water yield, the water ratio, pressure of supply water, the air feed total amount, supply gas pressure, the set(ting)value of jet length and plate speed, the PLC system realizes that by fine adjustment single-nozzle water supply supply gas pressure ratio and throughput ratio, up and down nozzle water-supply quantity ratio, upper spray nozzle jet length, nozzle ejection angle, up and down and plate speed the nozzle cooling intensity is regulated and the water spray status adjustment.
A kind of thin specification plate of moderate thickness vapor cooling system for use in offline heat treatment, it is characterized in that, the experience management system according to steel grade, the steel plate specification set, open cold temperature, final cooling temperature and speed of cooling, transfer the good operating regulation of debugging and be issued in the steam fog PLC of system; The formulation of operating regulation is based on the analysis-by-synthesis of tune-up data repeatedly.
Described vapor cooling system for use is that steam fog is cooling in thin specification plate of moderate thickness off-line quenching (solid solution) field novelty application, has following advantage:
Adopt the steam fog cooling nozzle of unique texture, aqueous vapor sprays after gap nozzle place's mixing fragmentation, atomizing effect is good, cooling uniformity is good, effectively solved the cold rear surface of steel plate temperature distributing disproportionation and the plate shape problem that produce when thin specification plate of moderate thickness off-line quenches (solid solution), (off-line of 4mm ~ 8mm) the present GB state of the art of (solid solution) technical field of quenching is compared and has been improved production efficiency and product lumber recovery with thin specification plate of moderate thickness.
Waterworks adopts pressure of supply water-flow double-close-loop to control, airing system adopts supply gas pressure-flow and frequency transformer closed-loop control, realize that water supply, air feed are stablized, controlled supply, effectively improve the cooling parameter control accuracy, enlarge the cooling intensity regulation range, promoted the vapor cooling system for use automatic control level, made operation more flexible, easy.
Adopt computer system to formulate steam fog cooling strategy and the cooling rules of each cooling section, regulate in conjunction with roller speed and jet length, realize that cooling path is freely controlled and final cooling temperature control, for thin specification plate of moderate thickness process for cooling is developed and product development provides research platform.
Description of drawings
Fig. 1 is the vapor cooling system for use structural representation in the present invention;
Fig. 2 is the steam fog nozzle arrangements schematic diagram in the present invention;
Fig. 3 is the steam fog nozzle water-gas circulation schematic diagram in the present invention;
Fig. 4 is the cooling automation system technical scheme of the steam fog in the present invention schema.
Embodiment
A kind of thin specification plate of moderate thickness vapor cooling system for use in offline heat treatment, by waterworks, airing system, steam fog nozzle, lifting transmission and composition of the control system, see Fig. 1, it is characterized in that the steam fog nozzle is arranged symmetrically with between roller up and down along rollgang 14, upper spray nozzle and upper roller-way are fixed on mobile upper frame 20, and lower nozzle is fixed on the fixed frame of equipment; The waterworks of vapor cooling system for use comprises shunting header 1, minute water-supply pipe 22, nozzle water-in 15 and steam fog nozzle 7, the pressure transmitter 16 and the variable valve on pressure release pressurize pipeline 17 18 that are arranged on shunting header 1 form the pressure of supply water closed loop control system, control by PID and realize that hydraulic pressure adjusts in real time, pressure of supply water is 0.2MPa ~ 0.4MPa, and water temperature is 0 ℃ ~ 32 ℃.Be arranged under meter 3 on water-supply line and variable valve 4 forms the water supply flow closed loop control systems, control by Fuzzy-PID and realize that the water yield adjusts in real time.
The airing system of described vapor cooling system for use is comprised of steam fog blower fan 5, steam fog frequency transformer 6, shunting effuser 8, gas supply flow meter 9, open and close valve 10, metallic hose 12 and nozzle inlet mouth 25, cooling air flows in the steam fog nozzle in this order, and supply gas pressure is 4KPa ~ 8KPa.For guaranteeing that airing system provides constant pressure air by set(ting)value, form the supply gas pressure closed loop control system by the pressure transmitter 19 and the steam fog fan frequency converter 6 that are arranged on the shunting effuser, control by PID and realize that supply gas pressure adjusts in real time.Be fine adjustment air feed total amount, form the gas supply flow closed loop control system by the under meter 9 and the fan frequency converter 6 that are arranged on supply air line, control by Fuzzy-PID and realize that air demand adjusts in real time.
The single steam fog nozzle of described vapor cooling system for use is seen Fig. 2, the long 2.8m ~ 3.5m of gap nozzle, and outer side wall 26 is stainless steel.Outer air storing cavity 23 is around being wrapped in internal layer water storage cavity 24 outsides, and two cavitys are place, gap UNICOM below nozzle only; Damping system 27 is comprised of in internal layer water storage cavity 24 two-layer sieve plate, and sparse near influent side sieve plate permeable hole, the aperture is large, and dense near water outlet side sieve plate permeable hole, the aperture is little, and design is wide to the uniform purpose of mass flow rate along steel plate to realize like this.Internal layer water storage cavity 24 gap nozzles are positioned at the vertical margin medullary ray, and the wide 2mm of water outlet seam goes out air cleft and is symmetrically arranged in water outlet gap nozzle outer rim both sides, goes out the wide 1.5mm of air cleft.Water coolant with certain pressure and speed is penetrated by the centre joint, air with certain pressure and speed is sprayed by the both sides air cleft, the angled shearing water curtain of pressurized air, spray along certain jet angle after fully mixing fragmentation, utilize large and characteristics forced convection of the gasification latent heat of water to realize that pressure is cooling, utilize the atomizing mixing effect of gas, make droplet more tiny evenly.
On described vapor cooling system for use, movable frame 20 is connected lifting motor 21 with universal-joint spindle by leading screw, lifting motor 21 rotatings drive mobile upper frame 20 and move up and down, measure the upper spray nozzle jet length by the displacement sensor that is fixed on edge on mobile upper frame 20 and be fixed between upper frame, the jet length scope is 30mm ~ 300mm, mobile upper frame 20 movings range are 0mm ~ 600mm, upper and lower roll 14 point of contact are decided to be 20 zero points of mobile upper frame, and lower nozzle ejection distance is fixed as 40mm.
Described vapor cooling system for use rollgang 14 is arranged symmetrically with up and down along steel plate 13 working direction, and 4 ~ 6 groups of steam fog nozzles are fixed in the rollgang gap, and every group of nozzle comprises two nozzles that the up and down is corresponding, and nozzle is being arranged between roll gap continuously; The rollgang type of drive is the concentration chains transmission, driving up and down roller-way Integral synchronous by a driving motor rotates, roller-way is by universal-joint spindle and reduction box connection for transmission motor, and plate speed is by the steam fog PLC of system and Frequency Converter Control, and the plate speed regulation range is 0.05m/s ~ 0.6m/s.
Embodiment 1
The present embodiment provides the vapor cooling device operational aspect of configuration vapor cooling system for use of the present invention, as shown in Fig. 1～3.when vapor cooling system for use begins to carry out cooling rules, waterworks, airing system, promote transmission system and press following technical scheme work: waterworks is by cooling rules unlatching work cooling section water-supply line open and close valve 2, at this moment, water coolant is by shunting header 1 successively through open and close valve 2, under meter 3, variable valve 4, water-in 15 enters steam fog nozzle water storage cavity 24, hydraulic pressure according to 1 upward pressure sensor 16 actual measurements of shunting header, automatically regulate the variable valve 18 on pressure release pressurize pipeline 17, make pressure of supply water reach set(ting)value, according to each water-supply line under meter 2 measured values, automatically regulate the variable valve 4 on minute water-supply pipe 22, control in real time water-supply quantity to reach set(ting)value, airing system is by cooling rules unlatching work cooling section supply air line open and close valve 10, open again steam fog blower fan 5, cooling air is through shunting effuser 8, under meter 9, open and close valve 10, metallic hose 12, enter outer air storing cavity 23 by steam fog nozzle inlet mouth 25, according under meter 9 measured values on minute supply air line 11, automatically regulate fan frequency converter 6 output frequencies, when flow deviation reaches elementary deviation, automatically regulate fan frequency converter 6 output frequencies according to pressure transmitter 19 measured values on shunting effuser 8 again, regulate supply gas pressure, when the pressure divergence value reaches elementary deviation, continue again adjust flux, so repeatedly until all reaching set(ting)value, flow and pressure allows final deviation, through above-mentioned adjusting, stable water coolant is sprayed by water outlet seam 28 through damping system 27, constant cooling air is by going out air cleft 29 ejections, and pressurized air is at the angled shearing water curtain in nozzle both sides, water coolant gap, and both spray along certain jet angle after fully mixing fragmentation, meanwhile, steam fog system improving motor 21 is pressed upper spray nozzle 7 and is set the jet length lifting or reduce upper frame 20, detect upper spray nozzle 7 actual ejection distances by mobile upper frame 20 displacement sensors, set(ting)value and actual value deviation be in allowed band the time, mobile upper frame 20 stop motions, after the jet length adjusting was complete, steam fog drive system driven by motor roller-way 14 was up and down rotated by setting plate speed.
Embodiment 2
The operation scheme that the present embodiment provides vapor cooling device to carry out the steam fog cooling control system, as shown in Figure 4.When heat treatment furnace is prepared to come out of the stove at steel plate, send and prepare to come out of the stove signal to vapor cooling system for use, come out of the stove steel plate number of being still waiting of transmitting simultaneously, vapor cooling system for use number reads steel plate plan information to be come out of the stove to level of factory MES or project management system with steel plate to be come out of the stove, this information comprises steel grade, steel plate specification, opens cold temperature, final cooling temperature and speed of cooling, the experience management system is formulated cooling strategy with the plan information that obtains, and calls the experience rule of management and is issued in PLC and carry out.PLC system Real Time Monitoring rules implementation status, control variable valve in water, air pipe and open and close valve and realize that cooling parameter accurately controls, wait surveying after each cooling parameter all reaches the rules set(ting)value, generation is ready to signal and passes to heat treatment furnace, heat treatment furnace is by the plate speed tapping of setting in cooling rules, in the time of the steel plate tapping, the steel plate runoff table after vapor cooling device rotates by identical plate speed.When steel plate is cooling in the steam fog cooling zone, system of the present invention provide stable, controlled water coolant by nozzle side to importing in nozzle internal layer water storage cavity, constant, the controlled cooling air that airing system provides is imported in the outer air storing cavity of nozzle by nozzle ends, water and air with certain pressure and initial velocity forms water smoke after nozzle exit mixing fragmentation, water smoke sprays along gap nozzle with certain initial velocity and jet angle, the high speed droplet pierces through the surperficial steam film of high-temperature steel plate, with the direct liquid-solid heat exchange of surface of steel plate.After steel plate went out the steam fog cooling zone, in the steam fog cooling zone, roller-way stopped automatically, and the steam fog blower fan is out-of-blast, and water-supply line open and close valve autoshutdown stops supplying water.
Described steam fog cooling control system is divided into 4 cooling sections with the steam fog of the many groups in equipment nozzle along the steel plate working direction, be followed successively by precooling zone, conventional cooling section, strengthen cooling section and inferior reinforcement cooling section, cooling strategy comprises each cooling section cooling time and cooling intensity, and cooling rules comprise each cooling section nozzle open and-shut mode, each cooling section water yield, each cooling section water ratio, pressure of supply water, air feed total amount, supply gas pressure, jet length and plate speed set(ting)value; In the cooling rules of steel plate, by regulating single-nozzle discharge and waterworks pressure of supply water and airing system supply gas pressure and air feed total amount, regulate vapour pressure force rate, aqueous vapor throughput ratio, jet angle and up and down nozzle water ratio, realize the adjusting of nozzle cooling intensity and spray regime.
Claims (8)
1. thin specification plate of moderate thickness vapor cooling system for use in offline heat treatment, comprise water supply, air feed, steam fog nozzle and Controlling System, it is characterized in that, the steam fog nozzle is arranged symmetrically with between the roller-way gap up and down along rollgang, upper spray nozzle and upper roller-way are fixed on mobile upper frame, and lower nozzle is fixed on fixed frame, supply water, the gas system catchments through shunting respectively, air pipe enters the steam fog nozzle, open and close valve is set on water-supply line, under meter, variable valve, provide stable, controlled water coolant by nozzle side to importing in nozzle internal layer water storage cavity, it is constant that airing system provides, controlled cooling air is imported in the outer air storing cavity of nozzle by nozzle ends, water and air with certain pressure and initial velocity forms water smoke after nozzle exit mixing fragmentation, water smoke sprays along gap nozzle with certain initial velocity and jet angle, the high speed droplet pierces through the surperficial steam film of high-temperature steel plate, with the direct liquid-solid heat exchange of surface of steel plate, Controlling System is comprised of experience management system and PLC system, the experience management system is formulated steam fog cooling strategy and cooling rules, and cooling rules are issued to the PLC system carry out, the PLC system realizes that by regulating water supply supply gas pressure ratio and throughput ratio, up and down nozzle water-supply quantity ratio, upper spray nozzle jet length, nozzle ejection angle, up and down and plate speed the nozzle cooling intensity is regulated and the water spray status adjustment.
2. a kind of thin specification plate of moderate thickness vapor cooling system for use in offline heat treatment as claimed in claim 1, it is characterized in that, waterworks comprises shunting header (1), divide water-supply pipe (22), nozzle water-in (15), nozzle (7 ') under steam fog upper spray nozzle (7) and steam fog, form the pressure of supply water closed loop control system by being arranged on pressure transmitter (16) in shunting header (1) and the variable valve (18) on pressure release pressurize pipeline (17), control by PID and realize that hydraulic pressure adjusts in real time, pressure of supply water is 0.2MPa ~ 0.4MPa, water temperature is 0 ℃ ~ 32 ℃, be arranged under meter (3) on water-supply line and flow control valve (4) and form the flow closed loop control system, control by Fuzzy-PID and realize that the water yield adjusts in real time.
3. a kind of thin specification plate of moderate thickness vapor cooling system for use in offline heat treatment as claimed in claim 1, it is characterized in that, airing system is comprised of steam fog blower fan (5), fan frequency converter (6) and supply air line (11), the cooling air of supplying with enters air storing cavity by shunting effuser (8), under meter (9), open and close valve (10), metallic hose (12), nozzle air intake (25) successively, and supply gas pressure is 4KPa ~ 8KPa; For guaranteeing that airing system provides constant pressure air by set(ting)value, form the supply gas pressure closed loop control system by the pressure transmitter (19) and the steam fog fan frequency converter (6) that are arranged on the shunting effuser, control by PID and realize that supply gas pressure adjusts in real time; Be fine adjustment air feed total amount, form the gas supply flow closed loop control system by the under meter (9) and the steam fog fan frequency converter (6) that are arranged on supply air line, control by Fuzzy-PID and realize that air demand adjusts in real time.
4. a kind of thin specification plate of moderate thickness vapor cooling system for use in offline heat treatment as claimed in claim 1, it is characterized in that, the structure of steam fog nozzle: the long 2.8m ~ 3.5m of gap nozzle, outer air storing cavity (23) is around being wrapped in internal layer water storage cavity (24) outside, and two cavitys are place, gap UNICOM below nozzle only; Damping system (27) is comprised of in internal layer water storage cavity (24) two-layer sieve plate, and close influent side sieve plate permeable hole is sparse, the aperture is large, and close water outlet side sieve plate permeable hole is dense, the aperture is little; Internal layer water storage cavity (24) gap nozzle is positioned at the vertical margin medullary ray, and the wide 2mm of water outlet seam goes out air cleft and is symmetrically arranged in water outlet gap nozzle outer rim both sides, and each goes out the wide 1.5mm of air cleft.
5. a kind of thin specification plate of moderate thickness vapor cooling system for use in offline heat treatment as claimed in claim 1, it is characterized in that, the upper spray nozzle (7) and the upper roller-way (14) that are fixed on mobile upper frame (20) move up and down with mobile upper frame (20) by lifting motor (21), regulate the upper spray nozzle jet length, upper spray nozzle jet length regulation range is 30mm ~ 400mm, and lower nozzle (7 ') jet length is fixed as 40mm.
6. a kind of thin specification plate of moderate thickness vapor cooling system for use in offline heat treatment as claimed in claim 1, it is characterized in that, the steam fog nozzle is parallel to rollgang and arranges 4 ~ 6 groups continuously, every group of nozzle comprises two nozzles that the up and down is corresponding, upper spray nozzle (7) is arranged between roller-way (14), lower nozzle (7 ') is arranged between lower roller, and rollgang speed is adjustable, and regulation range is 0.05m/s ~ 0.6m/s.
7. a kind of thin specification plate of moderate thickness vapor cooling system for use in offline heat treatment as claimed in claim 1, it is characterized in that, the experience management system is divided into 4 cooling sections with the steam fog of the many groups in equipment nozzle along the steel plate working direction, be followed successively by precooling zone, conventional cooling section, strengthen cooling section and time reinforcement cooling section, by formulating steam fog cooling strategy and cooling rules, realize that cooling path is controlled and final cooling temperature is controlled, cooling strategy comprises that setting respectively organizes the nozzle open and-shut mode, the nozzle cooling intensity, nozzle water spray state and each cooling zone cooling time, cooling rules comprise that each cooling section opens and closes, the water yield, the water ratio, pressure of supply water, the air feed total amount, supply gas pressure, the set(ting)value of jet length and plate speed, the PLC system realizes that by fine adjustment single-nozzle water supply supply gas pressure ratio and throughput ratio, up and down nozzle water-supply quantity ratio, upper spray nozzle jet length, nozzle ejection angle, up and down and plate speed the nozzle cooling intensity is regulated and the water spray status adjustment.
8. a kind of thin specification plate of moderate thickness vapor cooling system for use in offline heat treatment as claimed in claim 7, it is characterized in that, the experience management system according to steel grade, the steel plate specification set, open cold temperature, final cooling temperature and speed of cooling, transfer the good operating regulation of debugging and be issued in the steam fog PLC of system; The formulation of operating regulation is based on the analysis-by-synthesis of tune-up data repeatedly.
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