WO2024056072A1 - 一种高速喷气与辐射复合加热装置及其快速加热方法 - Google Patents

一种高速喷气与辐射复合加热装置及其快速加热方法 Download PDF

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WO2024056072A1
WO2024056072A1 PCT/CN2023/119092 CN2023119092W WO2024056072A1 WO 2024056072 A1 WO2024056072 A1 WO 2024056072A1 CN 2023119092 W CN2023119092 W CN 2023119092W WO 2024056072 A1 WO2024056072 A1 WO 2024056072A1
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Prior art keywords
jet
air
heating
radiation
strip
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PCT/CN2023/119092
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English (en)
French (fr)
Inventor
张利祥
李俊
张理扬
刘益民
王健
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宝山钢铁股份有限公司
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Publication of WO2024056072A1 publication Critical patent/WO2024056072A1/zh

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/34—Methods of heating
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/78—Combined heat-treatments not provided for above
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases

Definitions

  • the invention relates to the field of continuous heat treatment, and in particular to a high-speed jet and radiation composite heating device and a rapid heating method thereof.
  • radiant tube heating for domestic cold-rolled strip production mainly use radiant tube heating.
  • the heating method is achieved through radiant heating and natural convection of protective gas in the furnace.
  • the advantages of radiant tube heating technology are that the gas burns inside the radiant tube and the atmosphere in the furnace is clean, the surface quality of the strip is good, and the failure rate in the furnace is low.
  • the disadvantage of radiant tube heating technology is the slow heating speed. According to the furnace heating model:
  • the heating rate is: 12°C/s. As the strip temperature increases, the heating rate gradually decreases. When the strip temperature reaches about 800°C, The heating speed is about 1°C/s. Due to the low heating speed of the strip and the long heating section of the furnace, a large amount of heat is lost through the furnace shell, resulting in low heating efficiency of the furnace. Generally speaking, the thermal efficiency is about 50%. In addition, due to the uneven temperature of the radiant tube itself, with a local temperature difference of about 150°C, the temperature of the strip itself will also be uneven during the annealing process, which is prone to defects such as C warping, which is not conducive to the stable passing of the strip.
  • the double P-type radiant tube has been successfully developed and used in production internationally.
  • the temperature difference between the tubes of this radiant tube is about 50°C, which is beneficial to improving product quality and production efficiency.
  • the flue gas emission temperature is low, the exhaust gas circulation efficiency is high, and the combustion air preheating temperature reaches 700°C, so the overall thermal efficiency is further improved.
  • it still cannot solve core problems such as slow strip heating speed and large furnace thermal inertia, which hinders the development of continuous annealing and hot-dip galvanizing units in an efficient and fast direction.
  • Jet heating technology is a method in which fluid is sprayed onto a solid surface through a nozzle for heating. It is an extremely effective method to enhance heat transfer.
  • the impinging jet flow path is short and the boundary layer is thin.
  • Its heat transfer coefficient is several times higher than conventional heat exchange or natural convection in the tube, up to an order of magnitude.
  • jet heating and radiant tube heating transfer The thermal principle is different and is not affected by the blackness of the heating strip. For example, in the colored fields with low blackness, jet heating technology is common, such as European patent EP1507013A1.
  • the temperature difference of the aluminum strip temperature in the width direction is controlled at 3-5°C; the maximum annealing temperature of the aluminum strip is controlled at 600°C.
  • air jets are used in industrial production. Heating technology.
  • the temperature of the heating gas is generally controlled at 600°C to prevent the unit from breaking due to unexpected shutdown.
  • the advantages of this heating process firstly, it achieves uniform heating of the aluminum strip in the width direction, and the maximum temperature will not be higher than 600°C, thereby achieving stable and continuous production; secondly, due to the use of jet heating technology, the heating speed of the aluminum strip is faster , shorten the length of the unit.
  • the purpose of the present invention is to provide a high-speed jet and radiation combined rapid heating method, which combines high-speed jet heating technology and radiant tube heating technology. It not only has a fast heating speed, but also fully utilizes the advantages of high-speed jet heating technology and has good heating uniformity. It can greatly improve the heating speed and thermal efficiency of the strip in the furnace and reduce the impact of the furnace on the environment. It is of great significance to improving the overall technology of my country's large-scale strip continuous annealing furnace and developing low-carbon continuous annealing furnace.
  • a high-speed jet and radiation composite heating device which includes:
  • the thermal insulation box has a mounting hole in the center of one side;
  • a circulation fan is installed at the installation hole of the insulation box, its air suction port corresponds to the axis of the installation hole, and the air outlet is located on the side of the casing;
  • the buffer cavity is arranged in the insulation box corresponding to the air suction port of the circulating fan.
  • the back of the buffer cavity is provided with a hot air outlet corresponding to the air suction port of the circulating fan, and the front of the buffer cavity is provided with a hot air inlet;
  • Two air jet air boxes are arranged vertically and symmetrically on both sides of the hot air inlet on the front of the buffer cavity in the insulation box, forming a belt passage for the strip steel to pass through; one side edge of the two air jet air boxes located on both sides of the belt passage Several rows of nozzles are arranged at intervals in the height direction, and a gap is set between n rows of nozzles, n ⁇ 1;
  • a plurality of radiant tubes are symmetrically arranged outside the two jet air boxes.
  • the radiant tubes include a connecting pipe section connected to the nozzles, a radiating pipe section bent and extended from one end of the connecting pipe section, and a heat exchange pipe section formed by extending and bending from one end of the radiating pipe section;
  • the radiant tube section corresponds to the gap provided between the n rows of nozzles in the air jet air box, forming an alternating structure of air jet and radiation.
  • the air jet sealing box is a high temperature air jet air box.
  • the high-temperature air in the high-temperature jet air box The body temperature is above 750°C, such as 750 ⁇ 880°C.
  • the buffer cavity and the jet air box are of an integrated structure.
  • the nozzle adopts a round hole structure to ensure that the nozzle is not easily deformed at high temperatures. At the same time, this design can also reduce the vibration caused by the strip steel.
  • the diameter of the nozzle is 1/10 to 1/5 of the distance from the nozzle to the strip; within this range, the jet convection heat transfer coefficient remains basically unchanged. When it is larger than this range, the convection heat transfer coefficient decreases significantly.
  • the nozzle is a high-speed jet nozzle.
  • the speed of the jet gas at the nozzle outlet is not less than 50m/s.
  • the radiant tube sections, connecting tube sections, and heat exchange tube sections of the radiant tube are arranged in parallel.
  • the radiant tube not only has the function of heating strip steel by radiation, but also has the function of heating jet gas as a heat exchanger.
  • the shell of the thermal insulation box is equipped with thermal insulation material.
  • the present invention adopts the high-speed jet and radiation composite heating device and its rapid heating method.
  • the radiant tube is connected to the nozzle through a connecting pipe section, the combustion gas in the radiant tube is fully burned, and the strip entering the strip passage is radiated through the radiant pipe section to heat the strip;
  • the heat exchange tube section heats the gas that is pressurized by the circulating fan and enters the insulation box.
  • the heated hot air enters the jet air box and passes through the jet high-speed nozzle to heat the strip.
  • the hot air after heating the strip is pressurized by the circulating fan and then circulated.
  • the air outlet of the fan enters the insulation box again and is heated by the heat exchange tube section of the radiant tube to complete the cycle.
  • the gas for jet strip steel is N 2 +H 2 .
  • hot air is heated in a jet air box equipped with a radiant tube.
  • the radiant tube not only has a heating function but also a heat exchanger function.
  • This invention The radiant tube described in the invention is designed as a spatial structure. One stroke is facing the strip steel to radiate and heat the strip steel, and the other strokes are used to heat the hot gas. The heat of the radiant tube is obtained by burning the nozzle.
  • hot air is generated in an insulated box equipped with radiant tubes, and the gas heated by the high-speed jet is returned to the insulated box through a circulating fan to be heated again to complete the cycle; at the same time, the radiant tubes
  • the radiant tube section is directly opposite to the strip to achieve radiant heating; and because the radiant tube is installed inside the high-speed jet equipment, hot air is generated in the annealing furnace body, making the composite heating equipment compact, reducing the heat dissipation area of the equipment, and improving The overall thermal efficiency of the equipment.
  • the combined air injection and radiation heating technology of the present invention organically combines the air injection heating technology and the radiant tube heating technology, gives full play to the technical advantages of the air injection heating technology and the radiant tube heating technology, and quickly transfers the heat generated by the combustion of the radiant tube. Go to the strip to achieve rapid heating of the strip.
  • the heat flow density per unit area of the strip will be 20kW. If the strip is heated by combined air injection and radiation heating technology, the unit area of the strip will be The heat flow density is about 100kW.
  • the combined jet and radiation heating technology of the present invention realizes the simultaneous heating of strip steel by both jet convection and radiation heating methods, which can significantly increase the heating speed of strip steel and can transfer the heat generated by the gas in the radiant tube through forced convection heat exchange and radiation heat exchange.
  • the method is quickly transferred to the strip to achieve rapid heating of the strip. Under the same production capacity, the heating sections of more than a dozen passes can be reduced to 2-3 passes, saving equipment space.
  • the wall temperature of the radiant tube will be lower, so the exhaust smoke temperature of the radiant tube will also be reduced, and the length of the heating furnace will be shortened due to rapid heating (pass number From a dozen to 2-3), the heat lost through the furnace shell is reduced, which further improves the thermal efficiency of the radiant tube and improves energy utilization. It can not only reduce the operating cost of the unit and the cost per ton of steel, but also achieve energy conservation and carbon reduction. It can also enhance the competitiveness of enterprises themselves.
  • the strip is heated by radiant heating and circulating gas jet heating. Due to the uniformity of gas temperature and the easy control of edge effects by jet heating, the temperature uniformity in the width direction of the strip is good. It helps the strip to pass through the strip stably at high temperatures and has significant significance in improving the surface quality of the strip.
  • the heating speed of the combined air jet and radiation heating technology is about 4-5 times that of the radiant tube.
  • the average heating speed can reach 40-50°C/s in the range of 0-600°C. Therefore, the invention
  • the rapid heating technology can meet the heat treatment process requirements of high-quality automobile exterior panels, home appliance panels, and high-strength ultra-high-strength steel.
  • the high-speed jet and radiation composite rapid heating method of the present invention couples high-speed jet. Its heating speed is 4-5 times higher than that of the radiant tube heating furnace. Moreover, due to the good uniformity of the jet temperature, the uniformity during the strip heating process is from ⁇ 15 °C increased to ⁇ 5°C; in the low-carbon metallurgical process, the heat generated by the radiant tube is absorbed by the gas The forced jet flows to the strip, thus greatly reducing the heat transfer resistance between the radiant tube and the strip. According to actual operation, it is found that under the same conditions, the exhaust temperature of the radiant tube is reduced by about 100°C, and the thermal efficiency is increased by about 5%.
  • the thermal efficiency is 50%, then the method of the present invention can reduce carbon by 10%, which has significant advantages; at the same time, the rapid heating method of the present invention abandons the air jet and air cushion functions emphasized in the application of rapid heating methods in the field of non-ferrous metals.
  • the nozzle of the present invention adopts high-speed Nozzle, the jet convection heat transfer coefficient is increased from 120w/ m2k to 200w/ m2k , and coupled with radiation heating, the overall heating speed is approximately doubled compared to jet heating.
  • Figure 1 is a schematic structural diagram 1 of an embodiment of the present invention.
  • Figure 2 is a schematic structural diagram 2 of an embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of the jet air box in the embodiment of the present invention.
  • Figure 4 is a schematic structural diagram of a radiant tube in an embodiment of the present invention.
  • the high-speed jet and radiation composite heating device of the present invention includes,
  • the thermal insulation box 1 has thermal insulation material inside the shell; a mounting hole is provided in the center of one side of the thermal insulation box 1;
  • the circulation fan 2 is installed at the installation hole of the insulation box 1, its air suction port 21 corresponds to the axis of the installation hole, and the air outlet 22 is located on the side of the casing;
  • the buffer cavity 3 is arranged in the insulation box 1 corresponding to the air suction port 21 of the circulation fan 2.
  • the back of the buffer cavity 3 is provided with a hot air outlet 31 corresponding to the air suction port 21 of the circulation fan 2.
  • the front of the buffer cavity 3 is provided with a hot air inlet. 32;
  • Two jet air boxes 4, 4' are arranged vertically and symmetrically on both sides of the hot air inlet 32 on the front of the buffer cavity 3 in the insulation box 1, forming a channel 200 for the strip steel 100 to pass through; located on both sides of the channel 200 Several rows of high-speed jet nozzles 5, 5' are arranged on one side of the two jet air boxes 4, 4' at intervals along the height direction, and a gap 300 is provided between n rows of high-speed jet nozzles 5, 5', n ⁇ 1;
  • a plurality of radiant tubes 6, 6' are symmetrically arranged outside the two jet air boxes 4, 4'.
  • the radiant tubes 6 (taking the radiant tube 6 as an example, the same applies below) include a connecting pipe section 61 connected to the nozzle, and one end of the self-connecting pipe section 61. bend extension The extended radiant tube section 62 and the heat exchange tube section 63 formed by extending and bending from one end of the radiant tube section 62, the heat exchange tube section 63 is externally connected to the smoke exhaust pipe; the radiant tube section 62 corresponds to n rows of jet high-speed nozzles in the air jet air boxes 4, 4'
  • the gap 300 set between 5 and 5' forms an alternating structure of jet and radiation.
  • the gap 300 provided between the n rows of high-speed jet nozzles 5 and 5' in the jet air boxes 4 and 4' is a U-shaped structure, and the radiant tube section 62 of the radiant tube 6 is embedded in the U. within the shape structure.
  • the buffer cavity 3 and the jet air boxes 4, 4' are an integral structure.
  • the jet high-speed nozzles 5 and 5' adopt a circular hole structure.
  • the diameter of the high-speed jet nozzle is 1/10 to 1/5 of the distance from the jet nozzle to the strip.
  • the radiant tube sections, connecting tube sections, and heat exchange tube sections of the radiant tube are arranged in parallel.
  • the present invention adopts the method of the high-speed jet and radiation composite heating device.
  • the radiant tube is connected to the nozzle through the connecting pipe section, and the combustion gas in the radiant tube is fully burned.
  • the strip enters the strip passage through the radiant tube section and radiates the heating strip; at the same time, the The heat pipe section heats the gas that is pressurized by the circulating fan and enters the insulation box.
  • the heated hot air enters the jet air box and passes through the high-speed jet nozzle to heat the strip.
  • the hot air after heating the strip is pressurized by the circulating fan and then passes through the outlet of the circulating fan. Entering the insulation box again, the heat exchange tube section of the radiant tube is heated to complete the cycle.
  • the application of the high-speed jet and radiation composite heating technology of the present invention can significantly increase the production capacity of existing units and solve the problem of insufficient heating capacity on the production line.
  • This technology can quickly transfer the heat of the combustion gas in the radiant tube to the strip through forced heat exchange to achieve rapid heating of the strip.
  • the heat generated is taken away by the circulating gas in the wind box, which can not only reduce the exhaust temperature of the radiant tube and improve the thermal efficiency of the radiant tube, but also reduce the average operating temperature of the radiant tube and extend the service life of the radiant tube; after the heating cycle
  • the gas temperature is relatively uniform, so the temperature distribution in the width direction of the strip during the heating process is relatively uniform, thereby improving the stable operation performance of the unit and having very broad prospects for promotion and application.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Abstract

一种高速喷气与辐射复合加热装置及其快速加热方法，该装置包括，保温箱体（1），一侧面中央设安装孔；循环风机（2），设于保温箱体（1）安装孔处；缓冲腔体（3），设于保温箱体（1）内对应循环风机（2）进风口处，缓冲腔体（3）背面设与循环风机（2）进风口对应的热风出口（31），缓冲腔体（3）正面设热风进口（32）；两喷气风箱（4），竖直对称设置于保温箱体（1）内缓冲腔体（3）正面热风进口（32）两侧，喷气风箱（4）一侧面沿高度方向间隔设若干排射流高速喷嘴（5）；若干辐射管（6），分设于两喷气风箱（4）内，包括连接喷嘴的连接管段（61）、辐射管段（62）、换热管段（63）；形成喷气与辐射交替结构。通过复合高速喷气加热技术与辐射管（6）加热技术，不仅加热速度快，而且充分发挥了高速喷气加热的加热均匀性好等优点，大幅度提高带钢的加热速度和热效率。

Description

一种高速喷气与辐射复合加热装置及其快速加热方法 技术领域
本发明涉及连续热处理领域，特别涉及一种高速喷气与辐射复合加热装置及其快速加热方法。
背景技术
目前国内冷轧带钢生产的大型连续退火炉、热镀锌退火炉及保护气氛加热炉主要采用辐射管加热方式，其加热方式是通过辐射加热与炉内保护气体的自然对流方式实现。辐射管加热技术的优点是燃气在辐射管内部燃烧炉内气氛清洁，带钢表面质量好，炉内故障率低。辐射管加热技术的缺点是加热速度慢，根据炉内加热模型：

对于厚度1mm的带钢，当带钢温度为100℃时，其加热速度为：12℃/s，随着带钢温度的升高，加热速度逐步降低，当带钢温度达800℃左右时，加热速度约为1℃/s。由于带钢的加热速度较低，炉子加热段较长，大量的热量通过炉壳散失，导致炉子的加热效率较低，一般来说热效率约50％左右。另外由于辐射管自身温度不均匀，局部温差在150℃左右，退火过程中带钢本身温度也会不均匀，易于产生C翘等缺陷，不利于带钢的稳定通板。
为了解决这些问题目前国际上现已开发成功并用于生产中的双P型辐射管，该辐射管管体温差在50℃左右，有利于提高产品质量和生产效率。并且烟气排放量温度低，废气循环效率高，助燃空气预热温度达到700℃，因此整体热效率进一步提高。但是还是不能解决带钢加热速度慢，炉子热惯性大等核心问题，困扰着连续退火与热镀锌机组向高效、快捷的方向发展。
喷气加热技术是流体通过喷嘴喷射到固体表面进行加热的方法，它是一种极为有效的强化传热的方法。冲击射流流动行程短，边界层薄，其换热系数比常规的管内换热或者自然对流高出几倍直至一个数量级，除此之外喷气加热与辐射管加热传 热原理不同，不受加热带材黑度的影响，如在黑度较低的有色领域，喷气加热技术为常见，如欧洲专利EP1507013A1。
由于铝材的退火对温度控制比较严格，如铝带温度在宽度方向上的温差控制在3-5℃；铝带的最高退火温度控制在600℃，为了满足这些要求，因此工业生产中采用喷气加热技术。其中加热气体的温度一般控制在600℃以防由于意外停机，造成机组断带。这一加热过程的优点：首先是实现了铝带在宽度方向上的均匀加热，并且最高温度不会高于600℃，从而实现稳定连续生产，其次由于采用喷气加热技术铝带的加热速度较快，缩短机组的长度。
发明内容
本发明的目的在于提供一种高速喷气与辐射复合快速加热方法，综合了高速喷气加热技术与辐射管加热技术，不仅加热速度快，而且充分的发挥了高速喷气加热技术的优势加热均匀性好，能够大幅度提高炉内带钢的加热速度和热效率，减少炉子对环境的影响，对提高我国大型带钢连续退火炉整体技术，开发低碳型连续退火炉具有非常重要的意义。
为达到上述目的，本发明的技术方案是：
一种高速喷气与辐射复合加热装置，其包括：
保温箱体，其一侧面中央设安装孔；
循环风机，设置于所述保温箱体安装孔处，其吸风口对应安装孔轴线，出风口设于机壳侧面；
缓冲腔体，设置于所述保温箱体内对应循环风机吸风口处，缓冲腔体背面设与循环风机吸风口对应的热风出口，缓冲腔体正面设热风进口；
两喷气风箱，竖直对称设置于所述保温箱体内缓冲腔体正面热风进口的两侧，形成供带钢穿过的穿带通道；位于该穿带通道两侧的两喷气风箱的一侧面沿高度方向间隔设置若干排喷嘴，且，n排喷嘴之间设置一间隙，n≥1；
若干辐射管，对称设置于所述两喷气风箱外侧，所述辐射管包括连接喷嘴的连接管段、自连接管段一端弯折延伸的辐射管段、自辐射管段一端延伸弯折形成的换热管段；所述辐射管段对应所述喷气风箱中n排喷嘴之间设置的间隙，形成喷气与辐射交替结构。
优选的，所述喷气封箱为高温喷气风箱。优选地，所述高温喷气风箱中高温气 体的温度在750℃以上，如为750～880℃。
优选的，所述缓冲腔体与喷气风箱为一体结构。
优选的，所述喷嘴采用圆孔结构，保证高温时喷嘴不易变形，同时该设计还能减少引起带钢的振动。
优选的，所述喷嘴直径为喷嘴到带钢的距离的1/10～1/5；在这个范围内射流对流换热系数基本保持不变，当大于这个范围时对流换热系数明显下降。
优选的，所述喷嘴为射流高速喷嘴。优选的，所述喷嘴出口射流气体的速度不低于50m/s。
优选的，所述辐射管的辐射管段、连接管段、换热管段为平行设置。该辐射管既具有辐射加热带钢功能，又具有换热器加热射流气体的功能。
优选的，所述保温箱体的壳体内设保温材料.
本发明采用所述的高速喷气与辐射复合加热装置及其快速加热方法，辐射管通过连接管段连接喷嘴，辐射管内燃烧气体充分燃烧，通过辐射管段对进入穿带通道的带钢辐射加热带钢；同时，换热管段对由循环风机增压后进入保温箱体的气体加热，加热后的热风进入喷气风箱通过射流高速喷嘴射流加热带钢，加热带钢后的热风通过循环风机增压后经过循环风机出风口再次进入保温箱体内，由辐射管的换热管段加热，完成循环。
优选的，射流带钢的气体为N2+H2。
本发明热风在装有辐射管的喷气风箱内加热，辐射管除了具有加热功能还有换热器功能，为了增加热风与辐射管的换热效果同时又兼顾热风在喷气风箱内的阻力损失，本发明所述辐射管设计为空间结构，一个行程正对着带钢用来辐射加热带钢，其它行程用来加热热气，辐射管的热量通过喷嘴燃烧获得。
本发明所述喷气和辐射复合加热技术，热风在装有辐射管的保温箱体中产生，通过高速射流加热带钢后的气体经过循环风机回到保温箱体内再次加热，完成循环；同时辐射管的辐射管段与带钢直接相对实现辐射加热；并且由于辐射管安装在高速喷气设备的内部，这样实现了热风在退火炉体内产生，使得该复合加热设备结构紧凑，减少了设备的散热面积，提高了设备的整体热效率。
本发明的有益效果：
本发明所述喷气与辐射复合加热技术，将喷气加热技术与辐射管加热技术有机的结合在一起，充分发挥了喷气加热技术与辐射管加热技术的技术优势，把辐射管燃烧产生的热量迅速转移到带钢上去，实现带钢的快速加热。
举例而言，目前连退炉内较为常用的辐射管，如果辐射加热100℃的带钢，带钢单位面积的热流密度为20kW，如果通过喷气和辐射复合加热技术加热带钢，带钢单位面积的热流密度为100kW左右。这样首先可以大大缩短加热炉的长度，节省投资成本；其次，由于辐射管燃烧产生的热量被风箱中的循环气体带走，这不仅可以降低辐射管的排烟温度，提高辐射管的热效率，还可以降低辐射管的平均工作温度，延长辐射管的使用寿命；再次经过加热的循环气体温度较为均匀，因此加热过程中带钢宽度方向上的温度分布较为均匀，从而实现机组的稳定运行。
本发明喷气和辐射复合加热技术，实现射流对流以及辐射两种加热方式同时加热带钢，能显著提高带钢的加热速度、能够把辐射管内燃气产生的热量通过强制对流换热和辐射换热的方式迅速的转移到带钢上去，实现带钢的快速加热。在相同的生产能力下可以将十几个pass的加热段减少为2-3个pass，节省了设备占地空间。
由于辐射管内燃烧气体产生的热量被循环气体迅速的带走，这样会使得辐射管壁面温度较低，因此辐射管的排烟温度也会降低，并且由于快速加热使得加热炉的长度缩短(pass数量从十几个降低到2-3个)，通过炉壳散失的热量减少，进一步提高辐射管的热效率，提高能源的利用率，不仅能降低机组的运行费用与吨钢成本，实现节能降碳，还能提升企业自身的竞争力。
采用喷气和辐射复合加热技术，带钢加热是通过在辐射加热和循环气体射流加热，由于气体温度的均匀性以及射流加热易于边缘效应的控制，因此带钢宽度方向上的温度均匀性较好，有助于带感高温稳定通板，对改善带钢的表面质量有显著意义。
喷气和辐射复合加热技术，其加热速度约为辐射管加热速度的4-5倍，对于1mm厚的带钢在0-600℃范围内平均加热速度可达40-50℃/s，因此本发明所述快速加热技术可满足高品质汽车外板、家电板以及高强钢超高强钢的热处理工艺要求。
本发明高速喷气和辐射复合快速加热方法耦合了高速喷气，其加热速度对比辐射管加热炉提升4-5倍，并且由于喷气温度的均匀性好，因此带钢加热过程中的均匀性从±15℃提升到±5℃；在低碳冶金工艺方面，由于辐射管产生的热量被气体 强制射流到带钢，因此大大减少了辐射管到带钢之间传热热阻，根据运行实际发现同等情况下降低辐射管排烟温度约100℃，热效率提升约5％，根据工业上燃气利用的热效率为50％，那么本发明方法能够降碳10％，优势显著；同时，本发明所述快速加热方法摒弃了有色金属领域应用快速加热方法所强调的喷气与气垫功能，本发明喷嘴采用高速喷嘴，射流对流换热系数从120w/m2k提升到200w/m2k，再耦合辐射加热，整体加热速度相对喷气加热提升约1倍。
附图说明
图1为本发明实施例的结构示意图1；
图2为本发明实施例的结构示意图2；
图3为本发明实施例中喷气风箱的结构示意图；
图4为本发明实施例中辐射管的结构示意图。
具体实施方式
下面结合实施例和附图对本发明做进一步说明。实施例只是本发明方法的一种实现形式示例，但本发明方法不仅仅局限于这一种形式，采用本发明方法的其它实现形式也在本发明的保护范围之内。
参见图1～图4，本发明所述高速喷气与辐射复合加热装置，其包括，
保温箱体1，其壳体内设保温材料；保温箱体1的一侧面中央设安装孔；
循环风机2，设置于所述保温箱体1安装孔处，其吸风口21对应安装孔轴线，出风口22设于机壳侧面；
缓冲腔体3，设置于所述保温箱体1内对应循环风机2吸风口21处，缓冲腔体3背面设与循环风机2吸风口21对应的热风出口31，缓冲腔体3正面设热风进口32；
两个喷气风箱4、4’，竖直对称设置于所述保温箱体1内缓冲腔体3正面热风进口32的两侧，形成供带钢100穿过的通道200；位于该通道200两侧的两喷气风箱4、4’的一侧面沿高度方向间隔设置若干排射流高速喷嘴5、5’，且，n排射流高速喷嘴5、5’之间设置一间隙300，n≥1；
若干辐射管6、6’，对称设置于所述两喷气风箱4、4’外侧，所述辐射管6(以辐射管6为例下同)包括连接喷嘴的连接管段61、自连接管段61一端弯折延 伸的辐射管段62、自辐射管段62一端延伸弯折形成的换热管段63，换热管段63外接排烟管道；所述辐射管段62对应所述喷气风箱4、4’中n排射流高速喷嘴5、5’之间设置的间隙300，形成喷气与辐射交替结构。
在本实施例中，所述喷气风箱4、4’中n排射流高速喷嘴5、5’之间设置的间隙300处为一U形结构，所述辐射管6辐射管段62嵌设于该U形结构内。
优选的，所述缓冲腔体3与喷气风箱4、4’为一体结构。
优选的，所述射流高速喷嘴5、5’采用圆孔结构。
优选的，所述射流高速喷嘴直径为射流喷嘴到带钢的距离的1/10～1/5。
优选的，所述辐射管的辐射管段、连接管段、换热管段为平行设置。
本发明采用所述的高速喷气与辐射复合加热装置的方法，辐射管通过连接管段连接喷嘴，辐射管内燃烧气体充分燃烧，通过辐射管段对进入穿带通道的带钢辐射加热带钢；同时，换热管段对由循环风机增压后进入保温箱体的气体加热，加热后的热风进入喷气风箱通过射流高速喷嘴射流加热带钢，加热带钢后的热风通过循环风机增压后经过循环风机出风口再次进入保温箱体内，辐射管的换热管段加热，完成循环。
本发明所述高速喷气和辐射复合加热技术的应用，显著提升现存机组的产能，解决产线上加热能力不足的问题。该技术能够把辐射管内燃烧气体的热量通过强制换热迅速的转移到带钢上去，实现带钢的快速加热，这样可以大大缩短加热炉的长度，降低炉体的热惯性；由于辐射管中燃气产生的热量被风箱中的循环气体带走，不仅可以降低辐射管的排烟温度，提高辐射管的热效率，还可以降低辐射管的平均工作温度，延长辐射管的使用寿命；经过的加热的循环气体温度较为均匀，因此加热过程中带钢宽度方向上的温度分布较为均匀，从而提升机组的稳定运行的性能，具有非常广阔的推广应用前景。
上述实施例仅仅是阐述性的，并非用于限制本发明的范围。利用本发明构思衍生变化的方案也在本申请的保护范围内。

Claims (14)

  1. 一种喷气与辐射复合加热装置，其特征在于，所述装置包括：
    保温箱体，其一侧面中央设安装孔；
    循环风机，设置于所述保温箱体安装孔处，其吸风口对应安装孔轴线，出风口设于机壳侧面；
    缓冲腔体，设置于所述保温箱体内对应循环风机吸风口处，缓冲腔体背面设与循环风机吸风口对应的热风出口，缓冲腔体正面设热风进口；
    两喷气风箱，竖直对称设置于所述保温箱体内缓冲腔体正面热风进口的两侧，形成供带钢穿过的穿带通道；位于该穿带通道两侧的两喷气风箱的一侧面沿高度方向间隔设置若干排喷嘴，且，n排喷嘴之间设置一间隙，n≥1；
    若干辐射管，对称设置于所述两喷气风箱内，所述辐射管包括连接所述喷嘴的连接管段、自连接管段一端弯折延伸的辐射管段、自辐射管段一端延伸弯折形成的换热管段；所述辐射管段对应所述喷气风箱中n排射流高速喷嘴之间设置的所述间隙，形成喷气与辐射交替结构。
  2. 如权利要求1所述的喷气与辐射复合加热装置，其特征在于：所述缓冲腔体与喷气风箱为一体结构。
  3. 如权利要求1所述的喷气与辐射复合加热装置，其特征在于：所述喷嘴采用圆孔结构。
  4. 如权利要求1或3所述的喷气与辐射复合加热装置，其特征在于：所述喷嘴直径为喷嘴到带钢的距离的1/10～1/5。
  5. 如权利要求1所述的喷气与辐射复合加热装置，其特征在于：所述辐射管的辐射管段、连接管段、换热管段为平行设置。
  6. 如权利要求1所述的喷气与辐射复合加热装置，其特征在于：所述保温箱体的壳体内设保温材料。
  7. 如权利要求1所述的喷气与辐射复合加热装置，其特征在于：所述间隙为U形结构，所述辐射管段嵌设于该U形结构内。
  8. 如权利要求1所述的喷气与辐射复合加热装置，其特征在于：所述喷嘴为射流高速喷嘴，优选地，所述喷嘴出口射流气体的速度不低于50m/s。
  9. 如权利要求1所述的喷气与辐射复合加热装置，其特征在于：所述喷气风箱 为高温喷气风箱；优选地，所述高温喷气风箱中高温气体的温度在750℃以上，如为750～880℃。
  10. 采用如权利要求1～9中任一项所述的喷气与辐射复合加热装置进行的快速加热方法。
  11. 如权利要求10所述的快速加热方法，其特征在于，所述方法包括：使所述喷气与辐射复合加热装置辐射管内的燃烧气体充分燃烧，通过辐射管段对进入穿带通道的带钢进行辐射加热；同时，利用换热管段对由循环风机增压后进入保温箱体内的气体进行加热，并使加热后的热风进入喷气风箱，通过所述喷嘴射流加热带钢，加热带钢后的热风通过循环风机增压后经过循环风机出风口再次进入保温箱体内，被辐射管的换热管段加热，完成循环。
  12. 如权利要求11所述的快速加热方法，其特征在于，射流带钢的气体为N2+H2。
  13. 如权利要求10～12中任一项所述的快速加热方法，其特征在于，射流加热带钢时，带钢单位面积的热流密度≥50kW。
  14. 如大幅度10～13中任一项所述的快速加热方法，其特征在于，所述方法在0-600℃范围内的平均加热速度为30-50℃/s。
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