CN204353218U - A kind of spray vaporization cooling jet for hot-rolled high-strength reinforcing bar - Google Patents
A kind of spray vaporization cooling jet for hot-rolled high-strength reinforcing bar Download PDFInfo
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- CN204353218U CN204353218U CN201420851113.8U CN201420851113U CN204353218U CN 204353218 U CN204353218 U CN 204353218U CN 201420851113 U CN201420851113 U CN 201420851113U CN 204353218 U CN204353218 U CN 204353218U
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Abstract
For a spray vaporization cooling jet for hot-rolled high-strength reinforcing bar, belong to steel rolling spray vaporization cooling technology field.Comprise water inlet, air inlet, mixed aerosol chamber, waterfog head; The water inlet (1) on nozzle top is connected with diversion cavity (3) respectively with air inlet (4).Diversion cavity (3) is connected with the mixed aerosol chamber (2) of nozzle bottom, and nut (5) is for connecting mixed aerosol chamber (2) and waterfog head (6).To supply water and Supplying gas condition reaches within the scope of required hydraulic pressure, the water yield, air pressure, tolerance, required droplet size distribution can be obtained, make 1050 ~ 900 DEG C of instantaneous vaporizations in the high-temperature region of hot-rolled reinforced bar finishing temperature of the water droplet of this particle size range, and take away a large amount of vaporization latent heats of phase change, make hot-rolled reinforced bar obtain the cooling of high efficiency spray vaporization.Advantage is, effectively improves the heat exchange efficiency of hot-rolled reinforced bar, and effectively controls the cooling velocity of hot-rolled reinforced bar, while significantly improving hot-rolled reinforced bar intensity, avoids the formation of steel area endosexine martensite ring and the generation of surperficial red rust.
Description
Technical field
The utility model belongs to steel rolling cooling technology field, in particular, provides and provides a kind of spray vaporization cooling jet for hot-rolled high-strength reinforcing bar.
Background technology
The hot-rolled high-strength reinforcing bar of China adopts Water cooling method in 20 years in the past always, while raising intensity, inevitably brings martensite ring and surperficial red rust two large problems to hot-rolled reinforced bar.For while raising hot-rolled reinforced bar cooling effectiveness and raising reinforced steel bar strength, controlled cooling model speed and quenched martensite phase transformation effectively, need exploitation a kind of to hot-rolled reinforced bar under finishing temperature (1050-900 DEG C) condition, both there is enough cooling capacities and cooling velocity, be convenient to again the method and apparatus that packet segmentation carries out staged accelerating cooling.
Water smoke cooling means has very wide cooling velocity scope, and hydraulic spray nozzle with being convenient to independent or packet segmentation flexible arrangement and assembling, be of value to the requirement of the CCT continuous cooling transformation (CCT) curve characteristic sum Controlled cooling process parameter according to reinforcing bar, effectively and exactly control the cooling velocity of hot-rolled reinforced bar, the microscopic structure needed for acquisition and mechanical property.
But, first problems faced is, hydraulic spray nozzle can not adopt the structure of existing all kinds nozzle, must in raising cooling effectiveness, design and development goes out a kind of novel spray vaporization cooling jet, make this new type nozzle can under the water supply of existing hot-rolled reinforced bar unit production scene and Supplying gas condition, there is the water smoke of injection desired particle size range and make hot-rolled reinforced bar obtain structure and the ability of high efficiency Vaporizing cooling, to give full play to the vaporization latent heat of phase change λ=540cal/g of water far above the effect of specific heat of water Cp=1cal/g DEG C of this general principle in hot-rolled reinforced bar cooling, improve Vaporizing cooling and (comprise the contact heat-exchanging cooling of water at combination cooling, film boiling cooling and Vaporizing cooling) in ratio, thus the high efficiency cooling requirement reached based on Vaporizing cooling.
Summary of the invention
The purpose of this utility model is to provide a kind of spray vaporization cooling jet for hot-rolled high-strength reinforcing bar, solves existing all kinds of hydraulic spray nozzle and can not meet the problem of hot-rolled high-strength reinforcing bar to the requirement of high efficiency spray vaporization refrigerating function.
The utility model nozzle comprises water inlet, air inlet, diversion cavity, mixed aerosol chamber, nut and waterfog head, sees accompanying drawing 1, and the water inlet 1 on nozzle top is connected with diversion cavity 3 respectively with air inlet 4.Diversion cavity 3 is connected with the mixed aerosol chamber 2 of nozzle bottom, makes the gentle mixed aerosol under a certain pressure of water.Nut 5, 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.
To supply water and Supplying gas condition reaches within the scope of required hydraulic pressure, the water yield, air pressure, tolerance, required droplet size distribution can be obtained, make the water droplet of this particle size range (1050 ~ 900 DEG C) be instantaneous in the high-temperature region of hot-rolled reinforced bar finishing temperature to vaporize, and take away a large amount of vaporization latent heats of phase change, make hot-rolled reinforced bar obtain the cooling of high efficiency spray vaporization.
This nozzle adopts rectifier structure in the indoor design of mixing wastewater with air atomization chamber, gas can be ensured, water two-phase fluid becomes stable laminar condition from rambling turbulent condition after Homogeneous phase mixing, make the water smoke ejected in water droplet size distribution, jet state, flow field uniformity, remain a stable state, thus make hot reinforcing bar obtain good stable quick cooling curve.
This nozzle adopts the nozzle cross-section of V-type, make the flat pattern that fluidic vectoring thrust is fixing, improve the overlay length of fan-shaped water smoke along hot reinforcing bar longitudinal direction on the one hand, reduce because mixing wastewater with air is atomized the aerial decay of jet and escape caused on the one hand, make jet concentrate on the curved surfaces of hot reinforcing bar, utilize air water dispersed jet to greatest extent.
This nozzle adopts the nozzle type of nut structure formula, can carry out angular adjustment arbitrarily in use, to ensure can cover hot rebar surface exactly from the cooling water smoke shape of shower nozzle injection; Be further characterized in that, on the basis of the above, and then secondary-atomizing gap be set at shower nozzle place, further increase nebulization efficiency.
This nozzle can in certain aqueous vapor pressure and range of flow, regulate the region of droplet size distribution, make hot reinforcing bar under the primary condition of different finishing temperature, the ratio of raising Vaporizing cooling in various degree in combination cooling (comprising contact cooling, film boiling cooling, Vaporizing cooling), thus obtain different heat exchange efficiencies and cooling velocity.
This nozzle adopts metal hose and to supply water and steam line is connected, and water supply and the pressure of air feed and flow are controlled by the valve of water supply and steam line import department, Pressure gauge and flowmeter respectively.
By adjusting the distance of this jet expansion to rebar surface, water smoke stroke can be regulated, change the intensity that water smoke covers rebar surface, change water smoke pressure and speed, thus the vaporization capacity of adjustment and raising water smoke and Vaporizing cooling ratio, to regulate and to improve the efficiency of spray vaporization cooling.
The utility model has the advantage of, for the spray vaporization cooling jet of hot-rolled high-strength reinforcing bar, can in certain aqueous vapor pressure and range of flow, regulate the region of droplet size distribution, make hot reinforcing bar under the primary condition of different finishing temperature, the ratio of raising Vaporizing cooling in various degree in combination cooling (comprising contact cooling, film boiling cooling, Vaporizing cooling), thus obtain different heat exchange efficiencies and cooling velocity.
On this basis, nozzle of the present utility model, install and be applied in the spray vaporization cooling device of hot-rolled high-strength reinforcing bar unit in the mode of packet segmentation, effectively improve the heat exchange efficiency of hot-rolled reinforced bar, and effectively control the cooling velocity of hot-rolled reinforced bar, while significantly improving hot-rolled reinforced bar intensity, avoid the formation of steel area endosexine martensite ring and the generation of surperficial red rust.
Accompanying drawing explanation
Fig. 1 is the overall structure schematic diagram of the utility model spray vaporization cooling jet.Wherein, water inlet 1, mixed aerosol chamber 2, diversion cavity 3, air inlet 4, nut 5, waterfog head 6.
Fig. 2 is the typical droplet size distribution map adopting University Of Tianjin to make the utility model nozzle that " LSA-III type laser particle analyzer " measures.
Fig. 3 is the typical water smoke shape and size test data example schematic of the utility model spray vaporization cooling jet.
Detailed description of the invention
For illustrating that the utility model is used for the detailed description of the invention of the spray vaporization cooling jet of hot-rolled high-strength reinforcing bar, below in conjunction with accompanying drawing 1-3, illustrate as follows with regard to its operation principle and technical characteristic.
Spray vaporization cooling jet of the present utility model, form primarily of water inlet, air inlet, diversion cavity, mixed aerosol chamber, nut and waterfog head, the water inlet 1 on nozzle top is connected with diversion cavity 3 respectively with air inlet 4.Diversion cavity 3 is connected with the mixed aerosol chamber 2 of nozzle bottom, makes the gentle mixed aerosol under a certain pressure of water.Nut 5, 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.As shown in Figure 1, its water inlet and air inlet are connected with water supply and steam line by metal hose respectively, and water supply and the pressure of air feed and flow to supply water and the valve of steam line import department, Pressure gauge and flowmeter carry out regulation and control by being arranged on respectively.
The current with certain pressure and the air-flow of nozzle is entered from water inlet and air inlet distribution, by the rectifier structure in mixed aerosol chamber, water-air two phase flow body is after Homogeneous phase mixing, stable laminar condition is become from rambling turbulent condition, make the water smoke ejected in water droplet size distribution, jet state, flow field uniformity, a stable state can be remained, thus make hot reinforcing bar obtain good and stable quick cooling curve.
By regulating the pressure versus flow of water supply and air feed, make it to reach required hydraulic pressure, the water yield, air pressure, tolerance scope, namely required droplet size distribution can be obtained, such as, the typical droplet size distribution map that " the LSA-III type laser particle analyzer " that adopt University Of Tianjin to make as shown in Figure 2 measures, and the water droplet of this particle size range (1050 ~ 900 DEG C) in the high-temperature region of hot-rolled reinforced bar finishing temperature can instantaneously be vaporized, and take away a large amount of vaporization latent heats of phase change, make hot-rolled reinforced bar obtain the cooling of high efficiency spray vaporization.
Simultaneously, this nozzle adopts the nozzle cross-section of V-type, make the flat pattern that fluidic vectoring thrust is fixing, improve the overlay length of fan-shaped water smoke along hot reinforcing bar longitudinal direction on the one hand, reduce because mixing wastewater with air is atomized the aerial decay of jet and escape caused on the one hand, make jet concentrate on the curved surfaces of hot reinforcing bar, utilize air water dispersed jet to greatest extent, typical water smoke shape and size test data example schematic shown in Figure 3.
For improving the cooling effectiveness of this nozzle further, the utility model additionally uses the nozzle type of nut structure formula, can carry out angular adjustment arbitrarily in use, to ensure can cover hot rebar surface exactly from the cooling water smoke shape of shower nozzle injection; Be further characterized in that, on the basis of the above, and then secondary-atomizing gap be set at shower nozzle place, further increase nebulization efficiency.
Adopt two the utility model nozzles, spray vaporization cooling is carried out to the hot reinforcing bar of φ 20mm, and change by infrared radiation thermometer test reinforcing bar surface temperature, can measure, surface initial temperature be the reinforcing bar of 900 DEG C under spray vaporization cooling condition, the average cooling rate of 72 DEG C/0.1s can be obtained in 0.5 second.
Based on above-mentioned technical characteristic, the utility model nozzle is in the mode of packet segmentation, install and be applied in the spray vaporization cooling device of hot-rolled high-strength reinforcing bar unit, effectively improve the heat exchange efficiency of hot-rolled reinforced bar, and effectively control the cooling velocity of hot-rolled reinforced bar, while significantly improving hot-rolled reinforced bar intensity, avoid the formation of steel area endosexine martensite ring and the generation of surperficial red rust.
Claims (6)
1. for a spray vaporization cooling jet for hot-rolled high-strength reinforcing bar, it is characterized in that, this nozzle comprises water inlet, air inlet, diversion cavity, mixed aerosol chamber, nut, waterfog head; The water inlet (1) on nozzle top is connected with diversion cavity (3) respectively with air inlet (4), diversion cavity (3) is connected with the mixed aerosol chamber (2) of nozzle bottom, and nut (5) is for connecting mixed aerosol chamber (2) and waterfog head (6).
2., as claimed in claim 1 for the spray vaporization cooling jet of hot-rolled high-strength reinforcing bar, it is characterized in that, this nozzle adopts rectifier structure in the indoor design of mixing wastewater with air atomization chamber.
3. as claimed in claim 1 for the spray vaporization cooling jet of hot-rolled high-strength reinforcing bar, it is characterized in that, this nozzle adopts the nozzle cross-section of V-type.
4. as claimed in claim 1 for the spray vaporization cooling jet of hot-rolled high-strength reinforcing bar, it is characterized in that, this nozzle adopts the nozzle type of nut structure formula, and then arranges secondary-atomizing gap at shower nozzle place.
5. as claimed in claim 1 for the spray vaporization cooling jet of hot-rolled high-strength reinforcing bar, it is characterized in that, this nozzle adopts metal hose to be connected with water supply and steam line.
6., as claimed in claim 1 for the spray vaporization cooling jet of hot-rolled high-strength reinforcing bar, it is characterized in that, this nozzle is installed and is applied in the mode of packet segmentation in the spray vaporization cooling device of hot-rolled high-strength reinforcing bar unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420851113.8U CN204353218U (en) | 2014-12-26 | 2014-12-26 | A kind of spray vaporization cooling jet for hot-rolled high-strength reinforcing bar |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420851113.8U CN204353218U (en) | 2014-12-26 | 2014-12-26 | A kind of spray vaporization cooling jet for hot-rolled high-strength reinforcing bar |
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| CN204353218U true CN204353218U (en) | 2015-05-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113492156A (en) * | 2021-08-02 | 2021-10-12 | 重庆钢铁股份有限公司 | Cooling device of pinch roll and using method thereof |
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2014
- 2014-12-26 CN CN201420851113.8U patent/CN204353218U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113492156A (en) * | 2021-08-02 | 2021-10-12 | 重庆钢铁股份有限公司 | Cooling device of pinch roll and using method thereof |
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