WO2024056070A1 - 一种喷射辐射管预热系统 - Google Patents

一种喷射辐射管预热系统 Download PDF

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Publication number
WO2024056070A1
WO2024056070A1 PCT/CN2023/119087 CN2023119087W WO2024056070A1 WO 2024056070 A1 WO2024056070 A1 WO 2024056070A1 CN 2023119087 W CN2023119087 W CN 2023119087W WO 2024056070 A1 WO2024056070 A1 WO 2024056070A1
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WO
WIPO (PCT)
Prior art keywords
radiant tube
exhaust gas
furnace
preheating
furnace body
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PCT/CN2023/119087
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English (en)
French (fr)
Inventor
李俊
张理扬
张利祥
王健
刘华飞
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宝山钢铁股份有限公司
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Publication of WO2024056070A1 publication Critical patent/WO2024056070A1/zh

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Classifications

    • 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
    • C21D1/26—Methods of annealing
    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/06—Zinc or cadmium or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
    • C23C2/40—Plates; Strips

Definitions

  • the invention relates to the technical field of continuous heat treatment of strip steel, and in particular to a spray radiant tube preheating system.
  • Continuous annealing has largely replaced bell annealing due to its advantages such as high production efficiency and good strip surface quality.
  • the main equipment used for continuous annealing is the continuous annealing furnace.
  • the vertical annealing furnace is the preferred annealing furnace type for large continuous annealing units or hot-dip galvanizing units.
  • the vertical annealing furnace includes preheating section, heating section, soaking section, slow cooling section, rapid cooling section and other parts.
  • the heating section uses a radiant tube heating section
  • a large amount of combustion exhaust gas will be generated, and the temperature of the combustion exhaust gas is usually above 500°C.
  • the radiant tube combustion exhaust gas is usually directed to the preheating section (preheating furnace) with an exhaust gas fan.
  • the preheating section the strip steel runs upward.
  • One method is to directly The exhaust gas is sprayed onto the surface of the strip to preheat the strip.
  • Another method is to use a heat exchanger outside the furnace to heat the nitrogen and hydrogen protective gas, and then spray the nitrogen and hydrogen protective gas onto the surface of the strip to preheat the strip.
  • the waste gas after preheating the steel is discharged to the outside of the furnace through pipes, and then discharged after secondary utilization (usually using a waste heat boiler to recover heat).
  • the preheating temperature of the strip is It can only be preheated to about 150°C, and the preheating effect is poor;
  • the purpose of the present invention is to design a spray radiant tube preheating system that can fully utilize the waste heat of combustion exhaust gas to quickly preheat the strip temperature to at least 250°C; at the same time, it can avoid the combustion exhaust gas from directly contacting the strip for a long time in the preheating furnace. steel and generate an excessively thick oxide layer on the surface of the strip; at the same time, the temperature of the exhaust gas can be reduced to Below 200°C, it saves investment in secondary utilization outside the furnace, or it can also be used to heat hot water for further recycling.
  • a preheating furnace including:
  • the upper side wall of the furnace body is provided with at least one connection hole, which is used to connect the radiant tube exhaust gas collecting chamber that accommodates the radiant tube combustion exhaust gas generated by the radiant tube heating furnace through the communication tube;
  • the top of the furnace body is provided with the The top roller chamber of the radiant tube heating furnace corresponds to the furnace throat for the strip to pass through;
  • the bottom of the furnace body is equipped with a strip entrance, an entrance sealing device and an entrance steering roller;
  • the upper part of the furnace body is equipped with a preheating furnace gas chamber, which is used to communicate with The radiant tube exhaust gas collecting chamber is fluidly connected;
  • a lower partition with holes is provided in the lower part of the furnace body to form a lower exhaust gas collecting chamber, and is connected to an exhaust gas fan through an exhaust gas discharge pipe;
  • a number of heat exchange and jet air box units are arranged on both sides of the preheating furnace body below the preheating furnace gas chamber along the height direction of the furnace body, with a belt passage for the strip steel to pass through; each heat exchanger and The jet air box unit includes,
  • the air box body has a number of heat exchange tubes vertically arranged in it, and a number of nozzles are arranged on one side of the air box body relative to the belt passage; an exhaust gas secondary mixing chamber connected to the heat exchange tubes is arranged between the upper and lower air box bodies. ;
  • Circulation fan the port of its inlet pipe is arranged in the belt passage, and the port of its outlet pipe is located in the wind box;
  • Sealing devices for the strip to pass through are respectively provided at the lower port of the strip passage and the strip hole of the lower partition.
  • the inlet sealing device and the sealing device provided at the lower port of the belt passage and the belt hole of the lower partition are nitrogen-sealed structures, using a nitrogen-sealed chamber with a nitrogen injection pipe provided thereon.
  • a control valve is provided on the exhaust gas discharge pipe.
  • protective gas is introduced into the wind box.
  • the protective gas is nitrogen and hydrogen protective gas.
  • connection hole provided on the upper side wall of the furnace body is provided on the side wall of the preheating furnace gas collecting chamber, and is used to connect the radiant tube exhaust gas collecting chamber that accommodates the radiant tube combustion exhaust gas generated by the radiant tube heating furnace through the communication tube;
  • the inlet sealing device provided at the bottom of the furnace body is used to prevent the radiant tube combustion exhaust gas from flowing out of the furnace body;
  • the preheating furnace gas collection chamber provided in the upper part of the furnace body is used to fluidly communicate with the radiant tube exhaust gas collection chamber and accommodate the radiant tube combustion exhaust gas from the radiant tube exhaust gas collection chamber;
  • the lower partition with perforations provided in the lower part of the furnace body forms a lower exhaust gas collection chamber with the lower part of the furnace body, which is used to accommodate the heat-exchanged radiant tube combustion exhaust gas, and is connected to the exhaust gas fan through the exhaust gas discharge pipe;
  • the heat exchange and jet air box unit is used for heat exchange between the radiant tube combustion exhaust gas and the protective gas, and for circulating the protective gas to preheat the strip; this unit is arranged along the height direction of the furnace body below the preheating furnace gas collecting chamber. , on both sides above the lower exhaust gas collection chamber, a belt passage is formed in the middle for the strip steel to pass through;
  • the nozzles provided in the wind box are used to blow the heat-exchanged protective gas onto the strip;
  • the exhaust gas secondary mixing chamber provided between the wind box bodies is in fluid communication with the heat exchange tube, and is used to accommodate the exhaust gas after heat exchange, perform secondary mixing, and homogenize the temperature of the exhaust gas;
  • the circulation fan is used to suck out the protective gas injected into the belt passage, circulate it into the risk body, and exchange heat with the radiant tube combustion exhaust gas;
  • Sealing devices respectively provided at the lower port of the belt passage and the belt hole of the lower partition are used to prevent the radiant tube combustion exhaust gas from contacting the strip steel.
  • the invention also provides a jet radiant tube preheating system, which includes:
  • Radiant tube heating furnace has a furnace top roller chamber above the furnace body, and a steering roller is installed in the furnace top roller chamber;
  • a radiant tube exhaust gas collection chamber is connected to the radiant tube heating furnace body through a connecting pipe;
  • Preheating furnace including:
  • the upper side wall of the preheating furnace body is provided with at least one connecting hole, and is connected to the radiant tube exhaust gas collection chamber through a connecting tube; the top of the preheating furnace body is provided with a roller chamber corresponding to the top of the radiant tube heating furnace.
  • the furnace throat for strip steel to pass through; the bottom of the furnace body of the preheating furnace is equipped with a strip entrance, an entrance sealing device and an entrance steering roller; the upper part of the furnace body of the preheating furnace is equipped with a preheating furnace gas collecting chamber; the lower part of the furnace body is equipped with a belt threading hole
  • the lower partition forms an exhaust gas collection chamber and is connected to an exhaust gas fan through an exhaust gas discharge pipe;
  • each heat exchanger and The jet air box unit includes,
  • the air box body has a number of heat exchange tubes vertically arranged inside it, and a number of nozzles are arranged on one side of the air box body relative to the belt passage; an exhaust gas secondary mixing chamber connected to the heat exchange tubes is arranged between the upper and lower air box bodies. ;
  • Circulation fan the port of its inlet pipe is arranged in the belt passage, and the port of its outlet pipe is located in the wind box;
  • Sealing devices for the steel strip to pass through are respectively provided at the lower port of the strip passage and at the strip holes of the upper and lower partitions.
  • the inlet sealing device and the sealing device are nitrogen sealing structures, using a nitrogen sealing chamber with a nitrogen injection pipeline provided thereon.
  • a control valve is provided on the exhaust gas discharge pipe.
  • protective gas is introduced into the wind box.
  • nitrogen and hydrogen protective gas is passed into the wind box.
  • the present invention directly uses heat exchange in the furnace (the heat exchange is not arranged outside the furnace) to heat the recycled nitrogen and hydrogen protective gas, and uses the heated nitrogen and hydrogen protective gas to be sprayed at high speed onto the upper and lower surfaces of the strip to force convection heat exchange to achieve rapid and efficient preheating.
  • Strip steel compared with traditional heat exchange outside the furnace, this method has less heat loss in the furnace body, more waste heat from the combustion exhaust gas, higher heating efficiency, and faster heating rate.
  • the radiant tube combustion exhaust gas enters the preheating furnace gas collecting chamber from the radiant tube exhaust gas collection chamber through the connecting pipe, and then flows from the heat exchanger chamber in the preheating furnace (the heat exchanger is not set outside the furnace ) passes from top to bottom.
  • the combustion exhaust gas on the tube side and the nitrogen and hydrogen protective gas on the shell side undergo sufficient heat exchange in the heat exchanger to heat the nitrogen and hydrogen protective gas. Therefore, the radiant tube in the preheating furnace
  • the combustion exhaust gas is never in direct contact with the strip steel, thus avoiding oxidation of the strip steel surface.
  • the preheating temperature of strip steel is high, which can reach at least 250°C and above, which is at least 50°C higher than the temperature of ordinary preheated strip steel.
  • the temperature of the radiant tube combustion exhaust gas coming out of the multi-stage preheating furnace can usually be lower than 200°C and can be directly discharged. There is no need for additional investment to reuse the waste heat of the combustion exhaust gas outside the furnace.
  • Figure 1 is a schematic structural diagram of an embodiment of the present invention
  • Figure 2 is a schematic structural diagram of the preheating furnace in the embodiment of the present invention.
  • the jet radiant tube preheating system of the present invention includes:
  • Radiant tube heating furnace 1 has a furnace top roller chamber 101 located above the furnace body, and a steering roller 102 is provided in the furnace top roller chamber 101;
  • the radiant tube exhaust gas collection chamber 2 is connected to the furnace body of the radiant tube heating furnace 1 through the connecting pipe 21;
  • Preheating furnace 3 including:
  • the upper side wall of the preheating furnace body 31 is provided with at least one connection hole, and is connected to the radiant tube exhaust gas collection chamber 2 through a connecting pipe 32; the top end of the preheating furnace body 31 is provided with the radiant tube heating furnace 1
  • the top roller chamber 101 corresponds to the furnace throat 311 for the strip to pass through;
  • the bottom of the preheating furnace body 31 is provided with a strip entrance and an entrance sealing device 33 and an entrance Steering roller;
  • the upper part of the preheating furnace body 31 is provided with a preheating furnace gas collecting chamber 312;
  • the lower part of the preheating furnace body 31 is provided with a lower partition 313 with holes to form a lower exhaust gas collecting chamber 314, and passes through a
  • the exhaust gas discharge pipe 34 is connected to an exhaust gas fan 35 and is discharged from the chimney 200;
  • a plurality of heat exchange and jet air box units 36 are arranged on both sides below the preheating furnace gas collecting chamber 312 in the preheating furnace body 31 along the height direction of the preheating furnace body 31, with a through hole for strip steel passing through the middle.
  • each heat exchange and jet air box unit 36 includes,
  • the wind box body 361 has a number of heat exchange tubes 362 vertically arranged in it.
  • the wind box body 362 is provided with a number of nozzles 363 on one side of the belt passage 315; the heat exchange tubes 362 are arranged between the upper and lower wind box bodies 361.
  • the connected exhaust gas secondary mixing chamber 365; nitrogen and hydrogen protective gas is introduced into the wind box body 361;
  • the circulation fan 364 has an inlet pipe port located in the belt passage 315 and an outlet pipe port located in the wind box body 361;
  • the sealing device 37 for the strip to pass through is provided at the lower port of the strip passage 315 and the strip hole of the lower partition 313 .
  • the inlet sealing device 33 and the sealing device 37 are nitrogen sealing structures, using a nitrogen sealing chamber with a nitrogen injection pipeline provided thereon.
  • the exhaust gas discharge pipe 34 is provided with a control valve 38 .
  • the strip 100 runs upward after being turned by the inlet steering roller. After being sealed by the inlet sealing device, it enters the preheating furnace 3 for preheating treatment. Then it enters the furnace top roller chamber. After being turned by the steering roller, it enters the radiant tube heating furnace 1; radiant tube heating The combustion exhaust gas enters the radiant tube exhaust gas collecting chamber 2 and is connected to the preheating furnace gas collecting chamber 312 of the preheating furnace 1 through the connecting pipe 32.
  • the preheating furnace gas collecting chamber 312 is a closed gas collecting chamber to ensure that the exhaust gas in it is connected with the strip steel. 100 non-contact; the radiant tube combustion exhaust gas accumulates in the air collection chamber of the preheating furnace, and the radiant tube combustion exhaust gas is first used to preheat the combustion air required for its own combustion.
  • the high-temperature radiant tube combustion exhaust gas in the preheating furnace gas collecting chamber 312 continuously passes through the air-jet air box units connected in series one after another.
  • the air-jet air box units are equipped with heat exchange tubes (tubes) as heat exchangers inside.
  • the combustion exhaust gas of the radiant tube heats the nitrogen and hydrogen protective gas through the heat exchanger, and the heated nitrogen and hydrogen protective gas is blown to the upper and lower surfaces of the strip steel under the action of the circulating fan. Tropical steel.
  • the radiant tube combustion exhaust gas flows from top to bottom from the inside of the heat exchange tube.
  • heat exchange is performed to heat the nitrogen and hydrogen protective gas injected in the cycle, and then enters the exhaust gas secondary mixing chamber 365 between the jet air box units. Secondary mixing is performed to homogenize the temperature of the exhaust gas, and then it enters the downward furnace heat exchange and jet air box unit until it reaches the bottom nitrogen sealing device, and finally enters the exhaust gas collection chamber 314.
  • the nitrogen and hydrogen protective gas passes between the heat exchange tube bundles, is heated, and is continuously sprayed from the nozzle to the upper and lower surfaces of the strip to preheat the strip under the action of the circulating fan.
  • the air suction port of the circulating fan is connected to the DS side and WS side of the jet air box unit by the pipeline in the furnace.
  • the nitrogen-hydrogen mixed gas is sprayed onto the surface of the strip and is extracted from both sides, and then is blown out by the circulating fan. It is sprayed onto the upper and lower surfaces of the strip through the heat exchanger to achieve circular injection of nitrogen and hydrogen mixed gas to heat the strip.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
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Abstract

一种喷射辐射管预热系统，其包括：辐射管加热炉；辐射管废气集气室，通过连接管道连接辐射管加热炉；预热炉，包括：预热炉炉体，其上部通过连通管连通辐射管废气集气室；底部设带钢入口及入口密封装置和入口转向辊；预热炉炉体内上部设预热炉集气室；炉体内下部设废气集气室，并通过一废气排出管道连接废气风机；若干换热与喷气风箱单元，沿炉体高度方向设置于预热炉炉体内预热炉集气室下方的两侧，中间形成供带钢穿过的穿带通道。本发明可以充分利用燃烧废气的余热，将带钢温度快速预热到至少250℃以上；可以将排放的废气温度降低到200℃以下，省去炉外二次利用投资，或，也用于加热热水进一步回收利用。

Description

一种喷射辐射管预热系统 技术领域
本发明涉及带钢连续热处理技术领域，具体涉及一种喷射辐射管预热系统。
背景技术
连续退火因生产效率高，带钢表面质量好等优点已经大量取代了罩式退火。连续退火用的主要设备是连续退火炉。在连续退火炉中，立式退火炉是大型连退机组或者热镀锌机组的首选退火炉型式。
立式退火炉包括预热段、加热段、均热段、缓冷段、快冷段等部分。当加热段使用辐射管加热段时，会产生大量的燃烧废气，燃烧废气的温度通常在500℃以上。为了将辐射管燃烧废气的热量用到带钢上，通常把辐射管燃烧废气用废气风机引流到预热段(预热炉)，在预热段，带钢向上运行，一种方法是直接将废气喷射到带钢表面预热带钢，另一种方法是使用炉外换热器将氮氢保护气体加热，然后将氮氢保护气体喷射到带钢表面进行带钢预热。预热带钢后的废气，经管道排到炉外，进行二次利用(通常使用余热锅炉回收热量)后排放。此技术存在的不足是：
1)预热带钢后的辐射管燃烧废气排放温度仍然比较高，通常会超过300℃，有时会超过350℃。废气温度越高，意味着热能损失越多。
2)如果采用辐射管燃烧燃烧废气直接喷射到带钢表面，废气接触带钢而且接触时间较长，容易在带钢表面形成过厚的氧化层，引起表面质量问题，通常带钢的预热温度只能预热到150℃左右，预热效果较差；
3)如果采用炉外换热器将氮氢保护气体加热，然后将氮氢保护气体喷射到带钢表面进行带钢预热，废气行程长，热量损耗多，对节能不利。
发明内容
本发明的目的在于设计一种喷射辐射管预热系统，可以充分利用燃烧废气的余热，将带钢温度快速预热到至少250℃以上；同时避免燃烧废气在预热炉内长时间直接接触带钢而在带钢表面生成过厚的氧化层；同时可以将排放的废气温度降低到 200℃以下，省去炉外二次利用投资，或，也用于加热热水进一步回收利用。
为达到上述目的，本发明的技术方案是：
一种预热炉，包括：
炉体，其上部侧壁设至少一连接孔，该连接孔用于通过连通管连通容纳辐射管加热炉产生的辐射管燃烧废气的辐射管废气集气室；炉体的顶端设有与所述辐射管加热炉炉顶辊室对应、供带钢穿过的炉喉；炉体底部设带钢入口、入口密封装置和入口转向辊；炉体内上部设预热炉集气室，其用于与所述辐射管废气集气室流体连通；炉体内下部设一带穿带孔的下隔板，形成下部废气集气室，并通过一废气排出管道连接一废气风机；
若干换热与喷气风箱单元，沿炉体高度方向设置于所述预热炉炉体内预热炉集气室下方的两侧，中间形成供带钢穿过的穿带通道；每个换热与喷气风箱单元包括，
风箱体，其内竖直设置若干热交换管，风箱体相对所述穿带通道的一侧面设置若干喷嘴；上下设置的风箱体之间设置与热交换管连通的废气二次混合室；
循环风机，其进口管道的端口设置于所述穿带通道内，其出口管道的端口位于风箱体内；
可供带钢穿过的密封装置，分别设置于所述穿带通道的下端口及下隔板的穿带孔处。
优选的，所述入口密封装置和设置于所述穿带通道的下端口及下隔板的穿带孔处的密封装置为氮气密封结构，采用氮气密封室，其上设有氮气注入管道。
优选的，所述废气排出管道上设置控制阀。
优选的，所述风箱体内通入保护气体。
优选的，所述保护气体为氮氢保护气体。
本发明所述预热炉中：
炉体上部侧壁设置的连接孔设置在预热炉集气室的侧壁上，用于通过连通管连通容纳辐射管加热炉产生的辐射管燃烧废气的辐射管废气集气室；
炉体底部设置的入口密封装置用于阻止辐射管燃烧废气流出炉体外部；
炉体内上部设置的预热炉集气室用于与辐射管废气集气室流体连通，容纳来自辐射管废气集气室的辐射管燃烧废气；
炉体内下部设置的带穿带孔的下隔板与炉体的下部形成下部废气集气室，用于容纳换热后的辐射管燃烧废气，其通过废气排出管道连接废气风机；
换热与喷气风箱单元用于辐射管燃烧废气与保护气体的换热，以及循环保护气体对带钢进行预热；该单元沿炉体高度方向设置于所述炉体内预热炉集气室下方、下部废气集气室上方的两侧，中间形成供带钢穿过的穿带通道；
所述风箱体内设置的喷嘴用于将换热后的保护气体喷吹到带钢上；
设置在风箱体之间的废气二次混合室与热交换管流体连通，用于容纳热交换之后的废气，进行二次混合，对废气温度进行均匀化处理；
所述循环风机用于将喷射到穿带通道内的保护气体吸出，并循环到风险体内，与辐射管燃烧废气进行热交换；
分别设置于穿带通道的下端口及下隔板的穿带孔处密封装置用于阻止辐射管燃烧废气与带钢接触。
本发明还提供一种喷射辐射管预热系统，其包括：
辐射管加热炉，炉体上方设炉顶辊室，炉顶辊室内设置转向辊；
辐射管废气集气室，通过连接管道连接所述辐射管加热炉炉体；
预热炉，包括：
预热炉炉体，其上部侧壁设至少一连接孔，并通过连通管连通所述辐射管废气集气室；预热炉炉体顶端设与所述辐射管加热炉炉顶辊室对应、供带钢穿过的炉喉；预热炉炉体底部设带钢入口及入口密封装置和入口转向辊；预热炉炉体内上部设预热炉集气室；炉体内下部设一带穿带孔的下隔板，形成废气集气室，并通过一废气排出管道连接一废气风机；
若干换热与喷气风箱单元，沿炉体高度方向设置于所述预热炉炉体内预热炉集气室下方的两侧，中间形成供带钢穿过的穿带通道；每个换热与喷气风箱单元包括，
风箱体，其内竖直设置若干热交换管，风箱体相对所述穿带通道的一侧面设置若干喷嘴；上下设置的风箱体之间设置与热交换管连通的废气二次混合室；
循环风机，其进口管道的端口设置于所述穿带通道内，其出口管道的端口位于风箱体内；
可供带钢穿过的密封装置，分别设置于所述穿带通道的下端口及上、下隔板的穿带孔处。
优选的，所述入口密封装置、密封装置为氮气密封结构，采用氮气密封室，其上设有氮气注入管道。
优选的，所述废气排出管道上设置控制阀。
优选的，所述风箱体内通入保护气体。
优选的，所述风箱体内通入氮氢保护气体。
本发明的有益效果：
1、本发明直接采用炉内热交换(热交换不是布置在炉外)加热循环利用的氮氢保护气体，利用加热的氮氢保护气体高速喷射到带钢上下表面强制对流换热实现快速高效预热带钢，此方法与传统的炉外热交换相比，炉体热量损失少，燃烧废气余热更充分、加热效率更高、加热速率更快。
2、在预热炉内，辐射管燃烧废气从辐射管废气集气室通过连通管道进入预热炉集气室，然后从预热炉内的换热器室(换热器不是设置在炉外)从上向下通过，通过过程中走管程的燃烧废气与走壳程的氮氢保护气体在热交换器中进行充分的换热，加热氮氢保护气体，因此在预热炉内辐射管燃烧废气始终不与带钢直接接触，从而避免了带钢表面的氧化。
3、带钢预热温度高，至少可以达到250℃及以上，比普通预热带钢温度至少高出50℃。
4、如果喷射预热单元布置数量足够，经多级预热炉出来的辐射管燃烧废气温度通常可低于200℃，可以直接排放，根本无需追加投资进行燃烧废气余热的炉外二次利用。
附图说明
图1为本发明实施例的结构示意图；
图2为本发明实施例中预热炉的结构示意图。
具体实施方式
参见图1、图2，本发明所述的喷射辐射管预热系统，其包括：
辐射管加热炉1，炉体上方设炉顶辊室101，炉顶辊室101内设置转向辊102；
辐射管废气集气室2，通过连接管道21连接所述辐射管加热炉1炉体；
预热炉3，包括：
预热炉炉体31，其上部侧壁设至少一连接孔，并通过连通管32连通所述辐射管废气集气室2；预热炉炉体31顶端设与所述辐射管加热炉1炉顶辊室101对应、供带钢穿过的炉喉311；预热炉炉体31底部设带钢入口及入口密封装置33和入口 转向辊；预热炉炉体31内上部设预热炉集气室312；预热炉炉体31内下部设一带穿带孔的下隔板313，形成下部废气集气室314，并通过一废气排出管道34连接一废气风机35，自烟囱200排出；
若干换热与喷气风箱单元36，沿预热炉炉体31高度方向设置于所述预热炉炉体31内预热炉集气室312下方的两侧，中间形成供带钢穿过的穿带通道315；每个换热与喷气风箱单元36包括，
风箱体361，其内竖直设置若干热交换管362，风箱体362相对所述穿带通道315的一侧面设置若干喷嘴363；上下设置的风箱体361之间设置与热交换管362连通的废气二次混合室365；风箱体361内通入氮氢保护气体；
循环风机364，其进口管道的端口设置于所述穿带通道315内，其出口管道的端口位于风箱体361内；
可供带钢穿过的密封装置37，设置于所述穿带通道315的下端口及下隔板313的穿带孔处。
优选的，所述入口密封装置33、密封装置37为氮气密封结构，采用氮气密封室，其上设有氮气注入管道。
优选的，所述废气排出管道34上设置控制阀38。
带钢100经入口转向辊转向后向上运行，经入口密封装置密封后进入预热炉3进行预热处理，然后进入炉顶辊室，经转向辊转向后进入辐射管加热炉1；辐射管加热燃烧废气进入辐射管废气集气室2，通过连通管道32与预热炉1的预热炉集气室312连通，预热炉集气室312属密闭集气室，确保其内废气与带钢100不接触；辐射管燃烧废气在预热炉集气室积聚，辐射管燃烧废气先用于预热其自身燃烧所需的助燃空气。
在废气风机的抽力作用下，预热炉集气室312内的高温辐射管燃烧废气源源不断地通过逐个串联的喷气风箱单元，喷气风箱单元内部设置有作为换热器的热交换管(管程为高温燃烧废气，壳程为氮氢混合气体)；辐射管燃烧废气经换热器将氮氢保护气体加热，加热的氮氢保护气体在循环风机的作用下喷吹到带钢上下表面预热带钢。
辐射管燃烧废气从热交换管的内部从上向下流过，流动过程中进行热交换加热循环喷射的氮氢保护气体，然后进入喷气风箱单元之间的废气二次混合室365，进 行二次混合，对废气温度进行均匀化处理，然后再进入下行的炉内换热与喷气风箱单元，直至到达底部氮气密封装置，最后进入废气集气室314。
氮氢保护气体从热交换管束间通过，被加热后在循环风机的作用下，不停地从喷嘴喷射到带钢的上下表面预热带钢。循环风机的吸气口由炉内管道连接到喷气风箱单元的DS侧和WS侧，在循环风机的作用下，氮氢混合气体喷射到带钢表面后，从两侧被抽出，再由循环风机经热交换器喷射到带钢上下表面，实现氮氢混合气体循环喷射加热带钢。
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 (10)

  1. 一种预热炉，其特征在于，包括：
    炉体，其上部侧壁设至少一连接孔，该连接孔用于通过连通管连通容纳辐射管加热炉产生的辐射管燃烧废气的辐射管废气集气室；炉体的顶端设有与所述辐射管加热炉炉顶辊室对应、供带钢穿过的炉喉；炉体底部设带钢入口、入口密封装置和入口转向辊；炉体内上部设预热炉集气室，其用于与所述辐射管废气集气室流体连通；炉体内下部设一带穿带孔的下隔板，形成下部废气集气室，并通过一废气排出管道连接一废气风机；
    若干换热与喷气风箱单元，沿炉体高度方向设置于所述预热炉炉体内预热炉集气室下方的两侧，中间形成供带钢穿过的穿带通道；每个换热与喷气风箱单元包括，
    风箱体，其内竖直设置若干热交换管，风箱体相对所述穿带通道的一侧面设置若干喷嘴；上下设置的风箱体之间设置与热交换管连通的废气二次混合室；
    循环风机，其进口管道的端口设置于所述穿带通道内，其出口管道的端口位于风箱体内；
    可供带钢穿过的密封装置，分别设置于所述穿带通道的下端口及下隔板的穿带孔处。
  2. 如权利要求1所述的预热炉，其特征在于，所述入口密封装置和设置于所述穿带通道的下端口及下隔板的穿带孔处的密封装置为氮气密封结构，采用氮气密封室，其上设有氮气注入管道。
  3. 如权利要求1所述的预热炉，其特征在于，所述废气排出管道上设置控制阀。
  4. 如权利要求1所述的预热炉，其特征在于，所述风箱体内通入保护气体。
  5. 如权利要求4所述的预热炉，其特征在于，所述保护气体为氮氢保护气体。
  6. 一种喷射辐射管预热系统，其特征在于，包括：
    辐射管加热炉，炉体上方设炉顶辊室，炉顶辊室内设置转向辊；
    辐射管废气集气室，通过连接管道连接所述辐射管加热炉炉体；
    预热炉，包括：
    预热炉炉体，其上部侧壁设至少一连接孔，并通过连通管连通所述辐射管废气集气室；预热炉炉体顶端设与所述辐射管加热炉炉顶辊室对应、供带钢穿过的炉喉； 预热炉炉体底部设带钢入口及入口密封装置和入口转向辊；预热炉炉体内上部设预热炉集气室；预热炉炉体内下部设一带穿带孔的下隔板，形成废气集气室，并通过一废气排出管道连接一废气风机；
    若干换热与喷气风箱单元，沿炉体高度方向设置于所述预热炉炉体内预热炉集气室下方的两侧，中间形成供带钢穿过的穿带通道；每个换热与喷气风箱单元包括，
    风箱体，其内竖直设置若干热交换管，风箱体相对所述穿带通道的一侧面设置若干喷嘴；上下设置的风箱体之间设置与热交换管连通的废气二次混合室；
    循环风机，其进口管道的端口设置于所述穿带通道内，其出口管道的端口位于风箱体内；
    可供带钢穿过的密封装置，分别设置于所述穿带通道的下端口及下隔板的穿带孔处。
  7. 如权利要求6所述的喷射辐射管预热系统，其特征在于，所述入口密封装置、密封装置为氮气密封结构，采用氮气密封室，其上设有氮气注入管道。
  8. 如权利要求6所述的喷射辐射管预热系统，其特征在于，所述废气排出管道上设置控制阀。
  9. 如权利要求6所述的喷射辐射管预热系统，其特征在于，所述风箱体内通入保护气体。
  10. 如权利要求9所述的喷射辐射管预热系统，其特征在于，所述保护气体是氮氢保护气体。
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