WO2023097942A1 - 一种高炉低碳冶炼的喷吹调控装置及方法 - Google Patents

一种高炉低碳冶炼的喷吹调控装置及方法 Download PDF

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WO2023097942A1
WO2023097942A1 PCT/CN2022/086288 CN2022086288W WO2023097942A1 WO 2023097942 A1 WO2023097942 A1 WO 2023097942A1 CN 2022086288 W CN2022086288 W CN 2022086288W WO 2023097942 A1 WO2023097942 A1 WO 2023097942A1
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blast furnace
temperature
injection
control device
tuyere
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PCT/CN2022/086288
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English (en)
French (fr)
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周国成
祝凯
刘权利
张玉文
鲁雄刚
杨玉文
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昌黎县兴国精密机件有限公司
上海大学
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Publication of WO2023097942A1 publication Critical patent/WO2023097942A1/zh

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/16—Tuyéres
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/001—Injecting additional fuel or reducing agents
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/06—Making pig-iron in the blast furnace using top gas in the blast furnace process
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/001—Injecting additional fuel or reducing agents
    • C21B2005/005—Selection or treatment of the reducing gases

Definitions

  • the invention relates to the technical field of blast furnace metallurgy, in particular to an injection control device and method for oxygen blast furnace low-carbon smelting.
  • iron ore, coke, and flux (limestone) for slagging are loaded from the top of the furnace, and preheated air is blown in from the tuyeres located at the lower part of the furnace along the periphery of the furnace.
  • the carbon in coke some blast furnaces also inject auxiliary fuels such as pulverized coal, heavy oil, and natural gas
  • the oxygen blown into the air are burned to generate carbon monoxide and hydrogen
  • the carbon monoxide and hydrogen in the iron ore are removed during the process of rising in the furnace. Oxygen, thereby reducing to iron.
  • the smelted molten iron is released from the iron hole.
  • the unreduced impurities in the iron ore are combined with fluxes such as limestone to form slag, which is discharged from the slag outlet.
  • the gas produced is discharged from the top of the furnace, and after dust removal, it is used as fuel for hot blast stoves, heating furnaces, coke ovens, boilers, etc.
  • the main product of blast furnace smelting is pig iron, as well as by-product blast furnace slag and blast furnace gas.
  • the emerging oxygen-enriched blast furnace or oxygen blast furnace ironmaking process uses high-concentration oxygen or pure oxygen instead of traditional hot air, which can not only promote the combustion of pulverized coal and achieve a substantial increase in the amount of coal injection, but also has low nitrogen content in the top gas and is easy to separate Remove CO 2 , realize furnace top gas circulation, and minimize CO 2 emissions. Since the 1980s, metallurgists at home and abroad began to explore and research pure oxygen smelting technology, but in the end they could not solve the technical bottleneck of oxygen blast furnace, making this technology unable to realize industrial application.
  • the methods for adjusting the thermal state of the oxygen blast furnace are humidification and top gas circulation injection. Humidification will make the gas utilization rate worse overall, the fuel ratio will increase significantly, and the adjustment degree will be limited.
  • the tuyere circulates the top gas that has released CO 2 , and the circulating gas acts as a heat carrier to bring the excess heat from the lower part to the upper part, which can alleviate the "lower heat and upper cold" of the oxygen blast furnace to a certain extent, but at the same time, the tuyere circulates the top gas, Combustion occurs in the tuyere area, which further aggravates the "down heating".
  • the invention provides an injection control device and method for blast furnace low-carbon smelting.
  • a temperature-regulating injection port for injecting hydrocarbon-containing component injections to the blast furnace, the thermal cracking of hydrocarbon-containing component injections
  • the gas products produced by the reaction increase the gas volume of the blast furnace, and at the same time carry the excess heat from the lower high-temperature zone to the upper part of the blast furnace, flexibly solving the problem of "lower heat and upper cold" of oxygen-enriched blast furnaces or oxygen blast furnaces.
  • a blowing control device for blast furnace low-carbon smelting including a blast furnace tuyere for feeding rich oxygen or pure oxygen to form a tuyere swirl area; a plurality of temperature-regulating blowing ports are evenly arranged along the circumference of the blast furnace, and each of the temperature-regulating The nozzles all inject hydrocarbon-containing components to the blast furnace, and the temperature-adjusting nozzles are axially within the height range of the reflow drop zone and not lower than the position of the blast furnace tuyere , using the temperature near the tuyere gyration area to thermally crack the hydrocarbon-containing component injection to form a hydrocarbon thermal cracking endothermic zone.
  • the hydrocarbon-containing component injection includes methane; and also includes one or more of natural gas, coke oven gas, and liquefied petroleum gas.
  • the temperature-regulating injection port is located directly above the middle position of the adjacent blast furnace tuyeres.
  • the blast furnace low-carbon smelting injection control device also includes a furnace top CO 2 separation system, and the furnace top CO 2 separation system is used to separate CO 2 in the top gas of the blast furnace to obtain CO-rich and H2 top gas.
  • the top gas rich in CO and H 2 is re-injected into the blast furnace through the blast furnace tuyeres.
  • the middle position of the blast furnace is provided with several shaft injection ports, and the shaft injection ports are used to re-inject the top gas rich in CO and H2 into the blast furnace.
  • the injection control device for low-carbon smelting of the blast furnace further includes a preheating system, which is used to raise the temperature of the top gas rich in CO and H 2 .
  • the products of the thermal cracking reaction are carbon and hydrogen.
  • the shaft injection port is evenly arranged in the height range below the reflow dripping zone along the circumferential direction of the blast furnace, and is located above the temperature adjustment injection port.
  • a blowing control method for blast furnace low-carbon smelting which uses the blowing control device for blast furnace low-carbon smelting to carry out blowing control for blast furnace low-carbon smelting, and sprays hydrocarbon-containing components through the temperature-adjusting blowing port to generate heat
  • the pyrolysis reaction reduces the temperature in the tuyere swirl area and the blast furnace hearth, and the gas products of the thermal cracking reaction increase the blast furnace gas volume and carry excess heat from the tuyere swirl area to the upper part of the blast furnace.
  • the present invention has the advantages of:
  • thermal cracking strong endothermic reaction
  • the occurrence of thermal cracking (strong endothermic) reaction effectively reduces the temperature in the tuyere swirl area and near the hearth of the blast furnace.
  • the hydrocarbon-containing component injection and the gas product of pyrolysis reaction increase the amount of blast furnace gas, and can carry excess heat from the lower high-temperature zone to the blast furnace
  • the upper part of the oxygen-enriched blast furnace or oxygen blast furnace can flexibly solve the problem of "lower heat and upper cold"; the hydrocarbon-containing component injection is thermally cracked below the reflow drop zone to produce a large amount of hydrogen gas, and as the gas rises, the high temperature can be fully utilized
  • the ability of hydrogen to reduce iron ore reduces the direct reduction of carbon (strong endothermic reaction) and reduces the coke ratio.
  • the hydrogen generated by the cracking reaction can directly participate in the reduction of iron ore, reducing carbon and further reducing carbon emissions.
  • the blowing control device and method for blast furnace low-carbon smelting described in the present invention is to introduce enriched oxygen or pure oxygen into the tuyere of the blast furnace, that is to say, the oxygen-enriched blast furnace is used, the nitrogen content in the furnace top gas is very low, and the furnace top CO is used 2.
  • the separation system can easily separate and remove CO 2 , and fully realize the recycling of furnace top gas.
  • Fig. 1 is a schematic diagram of the front view of the embodiment 1 of the injection control device for blast furnace low-carbon smelting according to the present invention
  • Fig. 2 is a perspective view of the top view structure of the injection control device for low-carbon smelting of the blast furnace shown in Fig. 1;
  • Fig. 3 is a front structural schematic diagram of Embodiment 2 of the blowing control device for blast furnace low-carbon smelting according to the present invention
  • Fig. 4 is a front structural schematic diagram of Embodiment 3 of the injection control device for blast furnace low-carbon smelting according to the present invention.
  • the labels in the figure are: 1-temperature-regulating injection port, 2-blast furnace tuyere, 3-hydrocarbon pyrolysis heat absorption zone, 4-tuyere swirl zone, 5-blast furnace wall, 6-hydrocarbon-containing component injection , 7- blast device, 8- furnace top CO 2 separation system, 9- gas preheating system, 10- furnace body injection port.
  • FIG. 1-2 The front view and perspective view of the top view structure of the blast furnace low-carbon smelting injection control device according to the present invention are shown in Figure 1-2, the temperature regulation injection port 1 is located in the middle of two adjacent blast furnace tuyeres 2 and on the upper side s position.
  • a tuyere swirl area 4 In the new-type oxygen-enriched blast furnace or pure oxygen blast furnace, when oxygen-enriched or pure oxygen is introduced into each blast furnace tuyere 2, a tuyere swirl area 4 will be formed, and at the same time, a hydrocarbon-containing component jet will be injected into the temperature-regulating injection port 1. blow things6.
  • the injection 6 containing hydrocarbon components does not pass through the tuyere swirl 4, so it does not participate in the combustion reaction.
  • hydrocarbon-containing component injection 6 includes methane, and also includes one or more of natural gas, coke oven gas, and liquefied petroleum gas.
  • the pyrolysis reaction equation that takes place is as follows:
  • the formation of the heat-cracking heat-absorbing zone 3 effectively reduces the temperature of the tuyere convoluted zone 4 and the furnace hearth near the tuyere convoluted zone 4 .
  • the hydrocarbon-containing component ejecta 6 and the gas product H 2 of the pyrolysis reaction increase the amount of blast furnace gas, and carry excess heat from the lower high-temperature zone to the upper part of the blast furnace.
  • the gas product H2 will directly participate in the reduction of iron ore in the upper part of the blast furnace, reducing the direct reduction reaction of carbon (strong endothermic reaction).
  • Injection 6 mainly contains C elements and H elements, does not introduce other impurity gases, and is beneficial to the separation of CO 2 from furnace top gas.
  • the top gas is mainly rich in CO and H 2 and can be recycled.
  • One way is as shown in Figure 3, the top gas rich in CO and H2 is blown into the blast furnace through the blast furnace tuyere 2 together with oxygen-enriched/pure oxygen through the blast device 7 to participate in the combustion reaction.
  • the second way is as shown in Figure 4, the top gas rich in CO and H2 is heated up through the preheating system 9, and then transported into the blast furnace through the shaft injection port 10 provided at the shaft to participate in the reduction reaction.
  • a blowing control method for blast furnace low-carbon smelting using the above-mentioned blowing control device for blast furnace low-carbon smelting to carry out blowing control for blast furnace low-carbon smelting, spraying hydrocarbon-containing component injections through the temperature-adjusting blowing port 1 to generate
  • the pyrolysis reaction lowers the temperature near the tuyere convoluted area 4 and the hearth of the blast furnace, and the gas products of the pyrolysis reaction increase the gas volume of the blast furnace and carry excess heat from the tuyere convoluted area 4 to the upper part of the blast furnace.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture Of Iron (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)

Abstract

一种高炉低碳冶炼的喷吹调控装置及方法，包括用于通入富氧或纯氧形成风口回旋区（4）的高炉风口（2）；沿高炉周向均匀设置有多个调温喷吹口（1），每个所述调温喷吹口（1）均向所述高炉喷吹含碳氢组分喷吹物（6），所述调温喷吹口（1）在轴向上处于软熔滴落带所在的高度范围之内且不低于所述高炉风口（2）所在位置，利用所述风口回旋区（4）附近的温度将所述含碳氢组分喷吹物（6）发生热裂解反应，形成碳氢热裂解吸热区（3），含碳氢组分喷吹物（6）的热裂解反应产生的气体产物增大高炉煤气量，同时携带下部高温区多余的热量至高炉的上部，灵活解决富氧高炉或氧气高炉"下热上冷"的问题。

Description

一种高炉低碳冶炼的喷吹调控装置及方法 技术领域
本发明涉及高炉冶金技术领域，具体涉及一种氧气高炉低碳冶炼的喷吹调控装置及方法。
背景技术
高炉生产时从炉顶装入铁矿石、焦炭、造渣用熔剂(石灰石)，从位于炉子下部沿炉周的风口吹入经预热的空气。在高温下焦炭(有的高炉也喷吹煤粉、重油、天然气等辅助燃料)中的碳同鼓入空气中的氧燃烧生成的一氧化碳和氢气，在炉内上升过程中除去铁矿石中的氧，从而还原得到铁。炼出的铁水从铁口放出。铁矿石中未还原的杂质和石灰石等熔剂结合生成炉渣，从渣口排出。产生的煤气从炉顶排出，经除尘后，作为热风炉、加热炉、焦炉、锅炉等的燃料。高炉冶炼的主要产品是生铁，还有副产高炉渣和高炉煤气。
高炉作为目前主要的炼铁工艺，经过上百年的发展，其碳耗已接近该工艺的理论最低值，很难再有大的突破。新兴的富氧高炉或氧气高炉炼铁工艺，利用高浓度氧或纯氧代替传统的热风，不仅可以促进煤粉燃烧、实现喷煤量的大幅增加，而且炉顶煤气中氮含量低、易分离脱出CO 2，实现炉顶煤气循环，最大限度地降低CO 2排放。从上世纪80年代开始，国内外冶金学家开始纯氧冶炼工艺技术的探索和研究，但最终都解决不了氧气高炉的技术瓶颈，使得这一工艺无法实现工业化应用。氧气高炉亟待解决的关键技术难点之一是高富氧(全氧)使理论燃烧温度过高，高炉内温差发生变化，炉内下热上凉。高炉热量几乎全部来自风口回旋区燃料的燃烧热和热风带入的物理热。炉缸热状态不仅影响渣铁温度(即炉缸温度)还影响软熔带的形状、煤气流分布和铁氧化物等的还原反应，其主要标志是风口回旋区理论燃烧温度。
研究表明，鼓风富氧率增加1％，理论燃烧温度增加43℃。目前调节氧气高炉热状态的方法是加湿和炉顶煤气循环喷吹。加湿会使煤气利用率总体变差，燃料比大幅上升，调节程度有限。风口循环喷吹脱出CO 2的炉顶煤气，循环煤气作为热载体，把下部多余热量带到上部，一定程度上可以缓解氧气高炉“下热上冷”，但同时风口循环喷吹炉顶煤气，在风口区发生燃烧，这会进一步加剧“下热”。
发明内容
本发明提供一种高炉低碳冶炼的喷吹调控装置及方法，通过设置向所述高炉喷吹含碳氢组分喷吹物的调温喷吹口，含碳氢组分喷吹物的热裂解反应产生气体产物增大高炉煤气量， 同时携带下部高温区多余的热量至高炉的上部，灵活解决富氧高炉或氧气高炉“下热上冷”的问题。
本发明技术方案如下：
一种高炉低碳冶炼的喷吹调控装置，包括用于通入富氧或纯氧形成风口回旋区的高炉风口；沿高炉周向均匀设置有多个调温喷吹口，每个所述调温喷吹口均向所述高炉喷吹含碳氢组分喷吹物，所述调温喷吹口在轴向上处于软熔滴落带所在的高度范围之内且不低于所述高炉风口所在位置，利用所述风口回旋区附近的温度将所述含碳氢组分喷吹物发生热裂解反应，形成碳氢热裂解吸热区。
作为优选，所述含碳氢组分喷吹物包括甲烷；还包括天然气、焦炉煤气、液化石油气中的一种或多种。
作为优选，所述调温喷吹口设于相邻高炉风口中间位置的正上方。
作为优选，所述高炉低碳冶炼的喷吹调控装置还包括炉顶CO 2分离系统，所述炉顶CO 2分离系统用于分离出高炉的炉顶煤气中的CO 2，得到富含CO和H 2的炉顶煤气。
作为优选，所述富含CO和H 2的炉顶煤气通过高炉风口重新喷吹到高炉内。
作为优选，所述高炉的中间位置，设有若干炉身喷吹口，所述炉身喷吹口用于将所述富含CO和H 2的炉顶煤气重新喷吹到高炉。
作为优选，所述高炉低碳冶炼的喷吹调控装置还包括预热系统，所述预热系统用于对所述富含CO和H 2的炉顶煤气进行升温。
作为优选，所述热裂解反应的产物为碳和氢气。
作为优选，所述炉身喷吹口沿高炉周向均匀设于软熔滴落带之下的高度范围之内，且位于所述调温喷吹口之上。
一种高炉低碳冶炼的喷吹调控方法，使用上述高炉低碳冶炼的喷吹调控装置进行高炉低碳冶炼的喷吹调控，通过调温喷吹口喷出含碳氢组分喷吹物发生热裂解反应，降低风口回旋区以及高炉炉缸附近的温度，热裂解反应的气体产物增大高炉煤气量，携带风口回旋区多余的热量至高炉的上部。
本发明相对于现有技术优势在于：
1、本发明所述高炉低碳冶炼的喷吹调控装置及方法，通过调温喷吹口喷出的含碳氢组分喷吹物，在调温喷吹口附近发生的是热裂解(强吸热)反应，而不是传统高炉风口喷吹氧化燃烧的放热反应。热裂解(强吸热)反应的发生有效地降低风口回旋区以及高炉炉缸附近的温度。
2、本发明所述高炉低碳冶炼的喷吹调控装置及方法，含碳氢组分喷吹物及热裂解反应的 气体产物增大了高炉煤气量，可以携带下部高温区多余的热量至高炉的上部，灵活解决富氧高炉或氧气高炉“下热上冷”的问题；含碳氢组分喷吹物在软熔滴落带以下热裂解产生大量氢气，随着煤气的上升，充分发挥高温区氢气还原铁矿石的能力，减少了碳的直接还原(强吸热反应)，降低焦比。
3、本发明所述高炉低碳冶炼的喷吹调控装置及方法，裂解反应生成的氢气可以直接参与还原铁矿石，降低碳直接还原，进一步降低了碳排放。
4、本发明所述高炉低碳冶炼的喷吹调控装置及方法，在高炉风口通入富氧或纯氧，也即为采用富氧高炉，炉顶煤气中氮含量很低，使用炉顶CO 2分离系统很容易分离脱出CO 2，并充分实现炉顶煤气的循环利用。
附图说明
图1是本发明所述高炉低碳冶炼的喷吹调控装置实施例1的主视结构示意图；
图2是图1所示高炉低碳冶炼的喷吹调控装置俯视结构的透视图；
图3是本发明所述高炉低碳冶炼的喷吹调控装置实施例2的主视结构示意图；
图4是本发明所述高炉低碳冶炼的喷吹调控装置实施例3的主视结构示意图。
图中各标号为：1-调温喷吹口，2-高炉风口，3-碳氢热裂解吸热区，4-风口回旋区，5-高炉炉墙，6-含碳氢组分喷吹物，7-鼓风装置，8-炉顶CO 2分离系统，9-煤气预热系统，10-炉身喷吹口。
具体实施方式
为了便于理解本发明，下面结合附图和具体实施例，对本发明进行更详细的说明。
实施例1
本发明所述高炉低碳冶炼的喷吹调控装置的主视图和俯视结构的透视图如图1-2所示，所述调温喷吹口1位于相邻两个高炉风口2的中间且偏上的位置。新型富氧高炉或纯氧高炉，在其每一个高炉风口2通入富氧或纯氧时会形成一个风口回旋区4，与此同时向调温喷吹口1中喷吹含碳氢组分喷吹物6。含碳氢组分喷吹物6不经过风口回旋区4，因此不参与燃烧反应。而在高温中，这些含碳氢组分喷吹物6会发生热裂解反应，形成一个碳氢热裂解吸热区3。含碳氢组分喷吹物6包括甲烷，还包括天然气、焦炉煤气、液化石油气中的一种或多种。发生的热裂解反应方程式如下：
甲烷：CH 4→C+2H 2
乙烷：C 2H 6→2C+3H 2
丙烷：C 3H 8→3C+4H 2
丁烷：C 4H 10→4C+5H 2
丙烯：C 3H 6→3C+3H 2
丁烯：C 4H 8→4C+4H 2
……
所述热裂解吸热区3的形成有效地降低风口回旋区4以及风口回旋区4附近的炉缸温度。同时，含碳氢组分喷出物6以及热裂解反应的气体产物H 2增大高炉煤气量，携带下部高温区多余的热量至高炉的上部。而且气体产物H 2会在高炉上部直接参与铁矿石的还原，减少了碳的直接还原反应(强吸热反应)。喷吹物6主要含C元素和H元素，不会引入其它杂质气体，有利于炉顶煤气CO 2的分离。
将炉顶煤气通过CO 2分离系统8分离出CO 2后，炉顶煤气主要富含CO和H 2，可以进行循环利用。一种途径是按图3所示，将富含CO和H 2的炉顶煤气通过高炉风口2与富氧/纯氧一起经鼓风装置7喷吹到高炉内参与燃烧反应。第二种途径是按图4所示，将富含CO和H 2的炉顶煤气经过预热系统9进行升温，然后从炉身处设置的炉身喷吹口10输送入高炉内参与还原反应。
一种高炉低碳冶炼的喷吹调控方法，使用上述高炉低碳冶炼的喷吹调控装置进行高炉低碳冶炼的喷吹调控，通过调温喷吹口1喷出含碳氢组分喷吹物发生热裂解反应，降低风口回旋区4以及高炉炉缸附近的温度，热裂解反应的气体产物增大高炉煤气量，携带风口回旋区4多余的热量至高炉的上部。解决富氧高炉或氧气高炉“下热上冷”的问题；含碳氢组分喷吹物在软熔滴落带以下热裂解产生大量氢气，随着煤气的上升，充分发挥高温区氢气还原铁矿石的能力，减少了碳的直接还原(强吸热反应)，降低焦比。
上所述仅为本发明较佳的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到的变化或替换等都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应该以权利要求书的保护范围为准。

Claims (10)

  1. 一种高炉低碳冶炼的喷吹调控装置，其特征在于，包括用于通入富氧或纯氧形成风口回旋区的高炉风口；沿高炉周向均匀设置有多个调温喷吹口，每个所述调温喷吹口均向所述高炉喷吹含碳氢组分喷吹物，所述调温喷吹口在轴向上处于软熔滴落带所在的高度范围之内且不低于所述高炉风口所在位置，利用所述风口回旋区附近的温度将所述含碳氢组分喷吹物发生热裂解反应，形成碳氢热裂解吸热区。
  2. 根据权利要求1所述高炉低碳冶炼的喷吹调控装置，其特征在于，所述含碳氢组分喷吹物包括甲烷；还包括天然气、焦炉煤气、液化石油气中的一种或多种。
  3. 根据权利要求1或2所述高炉低碳冶炼的喷吹调控装置，其特征在于，所述调温喷吹口设于相邻高炉风口中间位置的正上方。
  4. 根据权利要求3所述高炉低碳冶炼的喷吹调控装置，其特征在于，还包括炉顶CO 2分离系统，所述炉顶CO 2分离系统用于分离出高炉的炉顶煤气中的CO 2，得到富含CO和H 2的炉顶煤气。
  5. 根据权利要求4所述高炉低碳冶炼的喷吹调控装置，其特征在于，所述富含CO和H 2的炉顶煤气通过高炉风口重新喷吹到高炉内。
  6. 根据权利要求4或5所述高炉低碳冶炼的喷吹调控装置，其特征在于，所述高炉的中间位置，设有若干炉身喷吹口，所述炉身喷吹口用于将所述富含CO和H 2的炉顶煤气重新喷吹到高炉。
  7. 根据权利要求6所述高炉低碳冶炼的喷吹调控装置，其特征在于，还包括预热系统，所述预热系统用于对所述富含CO和H 2的炉顶煤气进行升温。
  8. 根据权利要求1所述高炉低碳冶炼的喷吹调控装置，其特征在于，所述热裂解反应的产物为碳和氢气。
  9. 根据权利要求1所述高炉低碳冶炼的喷吹调控装置，其特征在于，所述炉身喷吹口沿高炉周向均匀设于软熔滴落带之下的高度范围之内，且位于所述调温喷吹口之上。
  10. 一种高炉低碳冶炼的喷吹调控方法，其特征在于，使用权利要求1-9之一所述高炉低碳冶炼的喷吹调控装置进行高炉低碳冶炼的喷吹调控，通过调温喷吹口喷出含碳氢组分喷吹物发生热裂解反应，降低风口回旋区以及高炉炉缸附近的温度，热裂解反应的气体产物增大高炉煤气量，携带风口回旋区多余的热量至高炉的上部。
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