WO2015180501A1 - 免酸洗连续退火炉还原气体循环再生利用系统及其利用方法 - Google Patents

免酸洗连续退火炉还原气体循环再生利用系统及其利用方法 Download PDF

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WO2015180501A1
WO2015180501A1 PCT/CN2015/070984 CN2015070984W WO2015180501A1 WO 2015180501 A1 WO2015180501 A1 WO 2015180501A1 CN 2015070984 W CN2015070984 W CN 2015070984W WO 2015180501 A1 WO2015180501 A1 WO 2015180501A1
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reducing gas
section
gas
annealing furnace
continuous annealing
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English (en)
French (fr)
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李俊
谭宁
马新建
关闯
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Baoshan Iron and Steel Co Ltd
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Baoshan Iron and Steel Co Ltd
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Priority to JP2016570339A priority Critical patent/JP6538088B2/ja
Priority to RU2016151999A priority patent/RU2684465C2/ru
Priority to KR1020167034952A priority patent/KR20170009903A/ko
Publication of WO2015180501A1 publication Critical patent/WO2015180501A1/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
    • 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
    • C21D9/561—Continuous furnaces for strip or wire with a controlled atmosphere or vacuum
    • 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
    • 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
    • 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
    • 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
    • C21D9/573—Continuous furnaces for strip or wire with cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/30—Details, accessories or equipment specially adapted for furnaces of these types
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/30—Details, accessories or equipment specially adapted for furnaces of these types
    • F27B9/3005—Details, accessories or equipment specially adapted for furnaces of these types arrangements for circulating gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/30—Details, accessories or equipment specially adapted for furnaces of these types
    • F27B9/40—Arrangements of controlling or monitoring devices
    • 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
    • F27D17/20—Arrangements for treatment or cleaning of waste gases
    • 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
    • F27D7/00—Forming, maintaining or circulating atmospheres in heating chambers
    • F27D7/04—Circulating atmospheres by mechanical means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • the invention relates to a recycling gas recycling and utilization technology, in particular to a hydrochloric acid-free continuous annealing furnace reducing gas circulation recycling system and a utilization method thereof.
  • the surface scale is usually removed by pickling.
  • the hot-rolled sheet can be directly subjected to reduction annealing without pickling, and the surface oxide scale is reduced by a reducing gas.
  • the direct use of metal iron which not only improves the metal yield and product, but also simplifies the production process, is receiving much attention.
  • the Chinese patents with the publications CN101956061 and CN102653815 disclose the process of recycling and protecting the gas of the bell-type bright annealing furnace.
  • the protective gas is condensed and removed by the condenser, the oil is absorbed by the oil absorber, and the deep-drying water is removed and then supplied to the bell-type bright annealing furnace.
  • the Chinese patent application No. 200710039842.8 discloses an annealing furnace protective atmosphere recycling method, which is directed to the recovery of the atmosphere in the continuous silicon nitride annealing furnace of the oriented silicon steel.
  • the basic process is condensation and dehydration of the reducing gas, filtering and removing impurities and then entering the combustion tube.
  • the road system heats the strip steel, which is a single-cycle process, and the utilization efficiency is not high, resulting in waste of energy.
  • the object of the present invention is to provide a hydrochloric acid-free continuous annealing furnace reducing gas circulation recycling system and a utilization method thereof, thereby saving energy consumption and reducing cost.
  • an acid-free continuous annealing furnace reducing gas circulation recycling system comprising a continuous annealing furnace, which has a preheating section, a heating section, a soaking section, and a slow connection in the strip conveying direction.
  • the cold section and the quick cooling section are characterized by:
  • An exhaust fan is provided at the inlet of the strip in the preheating section for extracting the reducing gas in the preheating section;
  • the input end is connected to the exhaust fan through a pipeline, and is used for heat exchange and cooling of the extracted reducing gas;
  • a gas desiccant purification device wherein the input end is connected to the heat exchanger through a pipeline for removing a small amount of water vapor generated by the reduction of the strip by the reducing gas;
  • the mixing device has an input end connected to the gas desiccant purifying device through a pipeline, a reducing gas supplementing tube at the other input end, and an output end connected to the quick cooling section through the pipeline, and the reducing gas and the supplementary reducing by drying
  • the gas is fully mixed to form a new reducing gas, it is input into the continuous annealing furnace from the rapid cooling section, and is reversed with the strip steel, and the strip steel is rapidly cooled in the rapid cooling section, and preheated and soaked in the slow cooling section.
  • the heat is exchanged by the exhaust fan to the heat exchanger to form a new cycle.
  • the utility model further comprises a plurality of boosting pumps, which are arranged on the pipeline between the first flow control valve and the heat exchanger, the quick cooling section and the slow cooling section, the slow cooling section and the heating section and the soaking section respectively.
  • It also includes two pressure detecting devices connected to the preheating section of the continuous annealing furnace and the air mixing device through a pipeline to detect the pressure in the furnace and the aeration pressure of the air mixing device.
  • a reducing gas concentration detector is further disposed on the reducing gas supply tube for detecting the concentration of the reducing gas to be replenished.
  • a dew point detecting device that is connected by a pipe between the gas desiccant purification device and the aeration device.
  • a dew point detection feedback device mounted on a conduit between the gas desiccant purification unit and the dew point detection unit.
  • a sealing roller is further disposed between the heating section and the soaking section in the continuous annealing furnace, and between the soaking section and the cooling section.
  • a bleed valve disposed at the other output of the aeration device for venting excess reducing gas.
  • the heating section and the soaking section are also supplemented by means of electric resistance heating, radiant heating, infrared heating or induction heating.
  • the drying medium used in the gas drying and purifying device is any one of molecular sieve, silica gel, activated alumina, anhydrous calcium chloride, calcium oxide, concentrated sulfuric acid, and phosphorus pentoxide.
  • a method for reducing and recycling a reducing gas in a pickling-free continuous annealing furnace which is carried out in the acid-free continuous annealing furnace reducing gas circulation recycling system according to any one of claims 1 to 12, includes the following steps:
  • the heat of the extracted reducing gas is exchanged by a heat exchanger, and further cooled to a temperature acceptable for the subsequent gas desiccant purification device;
  • a new reducing gas is added and thoroughly mixed to form a new reducing gas, and then input from the rapid cooling section of the continuous annealing reduction furnace, and the strip is reversed in the entire continuous annealing furnace, and is successively fast.
  • the strip is rapidly cooled in the cold section.
  • the gas heated by the strip enters the slow cooling section to slowly cool the strip and is further preheated by the strip.
  • the preheated gas enters the soaking section to reduce the strip.
  • the hot reducing gas is gradually transferred to the cold strip, and the cooled reducing gas is taken out from the strip inlet to start a new cycle.
  • the gas dew point is below -20 °C.
  • the gas dew point is below -40 °C.
  • the present invention has the following advantages:
  • the energy can be utilized efficiently, that is, the gas which has been cooled and dried in the outlet section of the furnace is used to cool the hot strip after reduction, and the soaked high temperature gas is used to sequentially heat and preheat the steel, thereby Both the reducing gas and the heat energy of the strip are effectively utilized.
  • Gas recycling with less pollutant emissions, can basically achieve zero emissions.
  • FIG. 1 is a schematic view showing a system for reducing gas recycling of an acid-free continuous annealing furnace according to an embodiment of the present invention.
  • FIG. 1 shows a hydrogenation-free continuous annealing furnace reducing gas circulation recycling system according to an embodiment of the present invention, as shown in the drawing, including a preheating section 2, a heating section 3, a soaking section 4, a slow cooling section 5, and a fast Continuous annealing furnace of cold section 6, heat exchanger 8, gas desiccant purification device (using deep drying tower) 9, aeration device 10, preheating section 2, heating section 3, soaking section 4, slow cooling section 5 And the quick cooling section 6 is sequentially connected in the conveying direction of the strip 1 , and an exhaust fan (not shown) is installed at the inlet of the strip in the preheating section for extracting the reducing gas in the preheating section 2, And the pressure signal in the furnace transmitted by the pressure sensor P1 is used to control the rotation speed and adjust the pumping flow rate, and the input end of the heat exchanger 8 is connected to the exhaust fan through a pipeline for heat exchange and cooling of the extracted reducing gas; gas drying The input end of the agent purifying device 9 is connected to the heat exchange
  • the acid-free continuous annealing furnace reducing gas circulation recycling system of the present invention further comprises the following components: two flow control valves 7, and the first flow control valve 7 is installed between the heat exchanger 8 and the preheating section 2
  • the second flow control valve 7 is installed in the reducing gas supplement pipe 16 of the air mixing device 10 for controlling the gas flow rate; the plurality of booster pumps M are disposed in the first flow control valve 7 and the heat exchanger 8, respectively.
  • the cold section 6 and the slow cooling section 5, the slow cooling section 5 and the pipe connecting the heating section 3 and the soaking section 4 are used for pressurization;
  • the disturbance device 11 is installed in the soaking section 4 in the annealing furnace to make the gas
  • two pressure detecting devices P are respectively connected to the preheating section 2 of the continuous annealing furnace and the air mixing device 10 through a pipeline for detecting the pressure in the furnace and the mixing pressure of the air mixing device;
  • the meter 13 is disposed on the reducing gas supplement pipe 16 for detecting the concentration of the reducing gas to be replenished;
  • a dew point detecting device DP is connected between the gas desiccant purifying device 9 and the air mixing device 10 through a pipe for detecting the Gas drying and purification
  • a dew point detection feedback device is installed on the pipeline between the gas desiccant purification device 9 and the dew point detecting device DP to determine whether the dew point of the dry gas meets the requirements,
  • the heating section 3 and the soaking section 4 may be heated by a high-temperature reducing gas, and may be supplemented by means of resistance heating, radiant heating, infrared heating or induction heating.
  • the drying medium used in the gas drying and purifying device 9 may be any one or a mixture of molecular sieve, silica gel, activated alumina, anhydrous calcium chloride, calcium oxide, concentrated sulfuric acid or phosphorus pentoxide.
  • the method for recovering and recycling the reducing gas in the pickling-free continuous annealing furnace of the present invention is carried out in the above-mentioned acid-free continuous annealing furnace reducing gas circulation recycling system shown in FIG. 1, comprising the steps of: reducing gas in the entire continuous annealing furnace
  • the inner side is stripped with the strip 1 (in the entire continuous annealing furnace, the flow direction of the reducing gas is reversed with the strip 1), and is taken out from the strip inlet of the preheating section 2 and preheated with the strip 1
  • the reducing gas is passed through the pressure detecting device P to transmit the measured pressure signal in the furnace to the exhaust fan to control the rotating speed of the exhaust fan and adjust the pumping flow rate; and the pre-tropical steel in the preheating section of the reducing gas before being extracted 1, the gas temperature decreases after preheating;
  • the extracted lower temperature reducing gas is further subjected to heat exchange through the heat exchanger 8, and further cooled to a temperature acceptable for the subsequent gas desiccant purification device;
  • the cooled reducing gas is input into the gas desiccant purification device 9 to perform deep dehydration, remove trace impurities, and dry, and is detected by the dew point detecting device DP to ensure that the gas dew point is below -20 ° C after being treated by the gas drying and purifying device. Good to below -40 ° C.
  • the fresh reducing gas is appropriately added and thoroughly mixed to form a new reducing gas, and then input from the rapid cooling section 6 of the continuous annealing reduction furnace, and the strip 1 is reversed in the continuous annealing furnace, and sequentially
  • the strip is rapidly cooled in the fast cooling section 6.
  • the gas heated by the strip enters the slow cooling section 5 to slowly cool the strip 1 and is further preheated by the strip, and the preheated gas enters the soaking section. 4 to carry out the reduction strip, and then through the heating section 3 and the preheating section 2, the hot reducing gas is gradually transferred to the cold strip 1, and the cooled reducing gas is extracted from the strip inlet to start a new cycle. .
  • the reducing medium of the present invention is much higher than the theoretical value required for the scale, in order to increase the scale reduction rate and efficiency, but the reducing gas of the present invention is recycled and utilized, and the excess reducing medium does not significantly increase the production cost. .
  • the strip 1 runs from the right (inlet) to the left (outlet), and the reducing gas is extracted from the inlet of the strip.
  • the furnace pressure sensor P transmits the furnace pressure signal to the exhaust fan port, controls the fan speed, and adjusts the flow control valve 7 to ensure The furnace pressure (micro positive pressure) is stable.
  • the extracted protective gas has a small amount of water vapor generated by the reaction with the iron oxide scale on the surface of the steel strip, and the gas has a certain temperature, and is cooled by the heat exchanger 8 to enter the gas desiccant purification device 9 to remove water vapor and impurity components.
  • the dew point detection feedback device 15 adjusts the action until the gas dew point is below -20 °C.
  • the dried reducing gas enters the aeration device 10, and is appropriately replenished with fresh hydrogen according to the component detection result detected by the reducing gas concentration detector 13, because a small amount of reducing medium is consumed through the scale, the hydrogen concentration is continuously detected, and feedback is made to the flow control. Valve 7 is controlled until the concentration reaches the set value.
  • the relief valve 14 mainly ensures the safety of the mixing station, and determines whether to release through the relief valve 14 based on the pressure detection signal of the air mixing device.
  • the mixed reducing gas is injected into the quick cooling section 6 through a booster pump M, and can be sprayed on the strip surface at a certain angle by a cyclic spray method for rapidly cooling the strip steel, and is quickly cooled and stripped.
  • the heated reducing gas is introduced into the slow cooling section 5 via another booster pump M and further preheated by the strip 1 and then the hot gas enters the soaking section 4 and the heating section 3.
  • the reducing gas entering the furnace flows from the left (outlet) to the right (inlet) into the preheating section 2, so that the heat of the hot reducing gas is gradually transferred to the cold strip, and the strip heating reduces the temperature of the reducing gas and is cooled.
  • the reducing gas (where the hydrogen concentration has decreased and the water content has increased) is withdrawn from the strip inlet section and a new cycle of water removal, purification, regeneration (recovering its reducing performance) begins.
  • the invention has the following advantages: excess reducing medium in the reducing gas which is not involved in the reaction can be recycled 100%, saving energy and reducing production cost; energy can be utilized efficiently, and high temperature gas can be used in the soaking section To heat and pre-tropical steel, the cooled and dried reducing gas entering from the outlet section of the furnace can be used to cool the hot strip, and the heat of the reducing gas and the strip can be effectively utilized and recycled. With less pollutant emissions, it can basically achieve zero emissions, and the effect is very significant.

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  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Metallurgy (AREA)
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  • Environmental & Geological Engineering (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Drying Of Gases (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Treating Waste Gases (AREA)

Abstract

一种免酸洗连续退火炉还原气体循环再生利用系统及其利用方法。所述连续退火炉包括预热段（2）、加热段（3）、均热段（4）、缓冷段（5）和快冷段（6）。还原气体的循环过程为：在预热段（2）的带钢入口处抽出还原气体；使抽出的较低温度的还原气体通过热交换器（8）降温；使冷却后的气体进入气体干燥剂净化装置（9）脱水干燥、去除杂质，以使气体露点达-20℃以下；在混气装置（10）中向干燥后的还原气体中补充还原气体，混合后的气体进入快冷段以快速冷却带钢（1）；被带钢（1）加热的还原气体进入缓冷段（5）进一步被带钢（1）预热，然后进入退火炉均热段还原带钢（1）；随后，还原气体依次进入加热段（3）和预热段（2），并使加热后的还原气体将热量逐步传递给冷态带钢（1）；最后将降温后的还原气体从带钢入口段抽出，开始新的循环。

Description

免酸洗连续退火炉还原气体循环再生利用系统及其利用方法 技术领域
本发明涉及一种还原气体循环再生利用技术，具体说涉及一种免酸洗连续退火炉还原气体循环再生利用系统及其利用方法。
背景技术
热轧板在进行后续加工或使用时，通常先采用酸洗法将表面氧化皮去除，近年来，人们提出热轧板可不经酸洗直接进行还原退火，利用还原性气体将表面氧化皮还原成金属铁加以直接利用，既提高金属收得率和产品，又简化生产流程，正备受关注。
申请号为US6402852B2、US6588491B2、WO00/12233、WO0003815A1和WO0191929A1的国际专利揭示了用氢气还原去除热轧带钢表面氧化皮的工艺与装备。在工艺过程中，还原介质氢气过量不多，绝大多数氢气被氧化铁皮消耗掉，剩余少量氢气直接燃烧后排放掉。第US6258186B1号专利则公开了用氢气还原热轧带钢氧化铁皮进而热镀锌的工艺，但工艺未涉及还原气体使用情况。公开号为CN101956061和CN102653815的中国专利揭示了钟罩式光亮退火炉保护气回收循环利用工艺，保护气经冷凝器冷凝去除水、吸油器吸油、深度干燥除水后重新供给钟罩式光亮退火炉，但未涉及保护气反复从高温到低温，再从低温到高温的能量利用问题。申请号为200710039842.8的中国专利公开了一种退火炉保护气氛回收利用方法，其针对的是取向硅钢连续渗氮退火炉内气氛的回收，基本过程是还原气体冷凝脱水，过滤除去杂质后进入燃烧管路系统加热带钢，是个单循环过程，利用效率不高，造成能源的浪费。
发明内容
本发明的目的是提供一种免酸洗连续退火炉还原气体循环再生利用系统及其利用方法，以节约能耗、降低成本。
根据本发明一方面提供一种免酸洗连续退火炉还原气体循环再生利用系统，包括连续退火炉，其具有在带钢传输方向上依次相连通的预热段、加热段、均热段、缓冷段和快冷段，其特征在于，还包括：
抽风机，设于预热段的带钢入口处，用以将预热段内的还原气体抽出；
换热器，输入端通过管道与抽风机连接，用以对抽出的还原气体进行换热降温；
气体干燥剂净化装置，输入端通过管道与换热器连接，用以对还原气体进行去除带钢还原所产生的少量水蒸汽；
混气装置，一输入端通过管道与气体干燥剂净化装置连接，另一输入端设有还原气体补充管，一输出端通过管道连接至快冷段，通过将干燥后的还原气体与补充的还原气体充分混合形成新的还原气体后，从快冷段输入在连续退火炉内，与带钢逆向而行，并依次对带钢进行快冷段内快速冷却、缓冷段内预热、均热段内退火还原、加热段内加热、预热段内预热的热交换后，再由抽风机抽出至换热器，形成新的循环。
还包括两个流量控制阀，其中第一流量控制阀安装在换热器和带钢预热段之间的管道，第二流量控制阀安装在混气装置的还原气体补充管上。
还包括数个增压泵，分设于第一流量控制阀与换热器、快冷段与缓冷段、缓冷段分别与加热段、均热段之间的管道上。
还包括扰动装置，安装在退火炉的均热段内。
还包括两个压力检测装置，分别通过管道与连续退火炉的预热段和混气装置相连，用以检测炉内压力和混气装置的混气压力。
还包括还原气体浓度检测仪，设于还原气体补充管上，用以检测补入的还原气体浓度。
还包括露点检测装置，通过管道连接于气体干燥剂净化装置和混气装置之间。
还包括露点检测反馈仪，安装在气体干燥剂净化装置和露点检测装置之间的管道上。
所述连续退火炉内的加热段和均热段，以及均热段和冷却段之间还设有密封辊。
还包括放散阀，设于混气装置的另一输出端，用于放散过量的还原气体。
所述的加热段和均热段还采用电阻加热、辐射加热、红外加热或感应加热的补充加热方式。
所述气体干燥净化装置所采用的干燥介质为分子筛、硅胶、活性氧化铝、无水氯化钙、氧化钙、浓硫酸、五氧化二磷中的任一种。
根据本发明另一方面提供一种免酸洗连续退火炉还原气体循环再生利用方法，在权利要求1至12之任一项所述的免酸洗连续退火炉还原气体循环再生利用系统中实施，包括以下步骤：
从预热段的带钢入口处抽出与带钢预热后的还原气体，并通过压力检测装置将测得炉内压力信号传送到抽风机，以控制抽风机的转速和调节抽气流量；
通过换热器对被抽出的还原气体进行热交换，进一步降温至后续气体干燥剂净化装置可接受的温度；
将冷却后的还原气体输入气体干燥剂净化装置进行深度脱水、去除微量杂质、干燥，并输入混气装置内；
经成分检测后，补入新的还原气体并充分混合形成新的还原气体后，再从连续退火还原炉的快冷段输入，在整个连续退火炉内与带钢逆向而行，并依次在快冷段内对带钢进行快速冷却，快冷后被带钢加热的气体进入缓冷段对带钢进行缓冷并进一步被带钢预热，预热的气体进入均热段进行还原带钢，再经加热段和预热段使热态的还原气体逐步传热给冷态带钢，而被降温的还原气体从带钢入口处被抽出，开始新的循环。
所述的还原气体经气体干燥净化装置处理后，气体露点达-20℃以下。
所述的还原气体经气体干燥净化装置处理后，气体露点达-40℃以下。
与现有技术相比，本发明具有如下优点：
1.还原气体中过量的未参与反应的还原介质(氢气)可100％循环利用，节约资源，降低生产成本；
2.能量可高效利用，即炉子出口段已被冷却并干燥后的气体用来冷却经还原后热的带钢，而经均热后的高温气体则用来依次加热和预热带钢，从而使得还原气体和带钢的热能均被有效利用。
3.气体循环利用，污染物排放少，基本可实现零排放。
附图说明
图1是本发明一个实施例的免酸洗连续退火炉还原气体循环再生利用系统的示意图。
具体实施方式
为让本发明的上述目的、特征和优点能更明显易懂，以下结合附图对本发明的具体实施方式作详细说明。首先需要说明的是，本发明并不限于下述具体实施方式，本领域的技术人员应该从下述实施方式所体现的精神来理解本发 明，各技术术语可以基于本发明的精神实质来作最宽泛的理解。在附图中相同的附图标记表示相同的部分。
图1示出本发明一个实施例的免酸洗连续退火炉还原气体循环再生利用系统，如图所示，包括具有预热段2、加热段3、均热段4、缓冷段5和快冷段6的连续退火炉、换热器8、气体干燥剂净化装置(可采用深度干燥塔)9、混气装置10，预热段2、加热段3、均热段4、缓冷段5和快冷段6在带钢1的传输方向上依次相连通，在预热段的带钢入口处安装有抽风机(图中未标示)，用以将预热段2内的还原气体抽出，并且还通过压力传感器P1传送的炉内压力信号来控制其转速和调节抽气流量，换热器8的输入端通过管道与抽风机连接，用以对抽出的还原气体进行换热降温；气体干燥剂净化装置9的输入端通过管道与换热器8连接，用以对还原气体进行去除带钢还原所产生的少量水蒸汽，并对还原气体进行深度干燥除水并滤除其他杂质；混气装置10连接于气体干燥剂净化装置9和快冷段6之间的管道上，一输入端通过管道与气体干燥剂净化装置9连接，另一输入端设有还原气体补充管16，一输出端通过管道连接至快冷段6，通过将干燥后的还原气体与补充的还原气体(如H2或CO)充分混合形成新的还原气体后，从快冷段输入在连续退火炉内，与带钢1逆向而行，并依次对带钢1进行快冷段6内快速冷却、缓冷段5内预热、均热段4内退火还原、加热段3内加热、预热段2内预热的热交换后，再由抽风机抽出至换热器，形成新的循环，而在此期间，还原气体逆向与带钢1热交换，即还原气体依次在快冷段6、缓冷段5内吸收带钢热量，使自身受热至高温，均热段4还原带钢，再在加热段3、预热段2内将热量传递给带钢，使自身逐步降温的一个过程。
本发明的免酸洗连续退火炉还原气体循环再生利用系统还包括以下多个部件：二个流量控制阀7，第一个流量控制阀7安装在换热器8和预热段2之间管道上，第二个流量控制阀7安装在混气装置10的还原气体补充管16，用以控制气体流量；数个增压泵M，分设于第一流量控制阀7与换热器8、快冷段6与缓冷段5、缓冷段5与连接加热段3和均热段4的管道上，用以增压；扰动装置11，安装在退火炉内的均热段4内，使气体呈湍流状态；两个压力检测装置P，分别通过管道与连续退火炉的预热段2和混气装置10相连，用以检测炉内压力和混气装置的混气压力；一还原气体浓度检测仪13，设于还原气体补充管16上，用以检测补入的还原气体浓度；一露点检测装置DP，通过管道连接于气体干燥剂净化装置9和混气装置10之间，用以检测经气体干燥净化 装置处理后的气体露点；一露点检测反馈仪，安装在气体干燥剂净化装置9和露点检测装置DP之间的管道上，用于判断干燥气体露点是否达到要求，若122不合要求气体将返回干燥装置重新干燥直至露点设定值；两对密封辊12分别安装在退火炉内的加热段3和均热段4之间以及均热段4与冷却段6之间，用于隔离不同区间段的冷热气体，防止气体交叉流动；以及一放散阀14，设于混气装置10的另一输出端，根据压力检测装置P所检测的混气装置10的压力检测信号，决定是否放散过量的干燥后的还原气体，以保证安全。
另外，加热段3和均热段4除了利用高温还原气体加热带钢1外，还可采用电阻加热、辐射加热、红外加热或感应加热等补充加热方式。
气体干燥净化装置9所采用的干燥介质可采用分子筛、硅胶、活性氧化铝、无水氯化钙、氧化钙、浓硫酸或五氧化二磷中的任一种或多种混合物。
本发明的免酸洗连续退火炉还原气体循环再生利用方法，在图1所示的上述免酸洗连续退火炉还原气体循环再生利用系统中实施，包括以下步骤：使还原气体在整个连续退火炉内与带钢1逆向而行(在整个连续退火炉内，还原气体的流向为与带钢1逆向而行)，并从预热段2的带钢入口处抽出与带钢1预热后的还原气体，并通过压力检测装置P将测得炉内压力信号传送到抽风机，以控制抽风机的转速和调节抽气流量；而被抽出前热的还原气体在预热段内预热带钢1，预热后气体温度降低；
使被抽出的较低温度的还原气体进一步通过换热器8进行热交换，进一步降温至后续气体干燥剂净化装置可接受的温度；
将冷却后的还原气体输入气体干燥剂净化装置9进行深度脱水、去除微量杂质、干燥，并通过露点检测装置DP进行检测，保证经气体干燥净化装置处理后，气体露点达-20℃以下，较佳的达-40℃以下。
经成分检测后，适当补入新鲜的还原气体并充分混合形成新的还原气体后，再从连续退火还原炉的快冷段6输入，在连续退火炉内与带钢1逆向而行，并依次在快冷段6内对带钢进行快速冷却，快冷后被带钢加热的气体进入缓冷段5对带钢1进行缓冷并进一步被带钢预热，预热的气体进入均热段4进行还原带钢，再经加热段3和预热段2使热态的还原气体逐步传热给冷态带钢1，而被降温的还原气体从带钢入口处被抽出，开始新的循环。
本发明的还原介质远高于氧化皮所需的理论值，目的是提高氧化皮还原速率和效率，但本发明所述还原气体是循环再生利用的，过量的还原介质并不会显著增加生产成本。
为更清楚理解本发明的系统和方法的特点和优点，现对还原气体循环再生利用方式的具体实施步骤进一步举例说明：
带钢1从右(入口)向左(出口)运行，从带钢入口处抽出还原气体，炉压传感器P将炉压信号传送到抽风机口，控制风机转速，调节流量控制阀7，以保证炉压(微正压)稳定。此时被抽出的保护气中存在与带钢表面氧化铁皮反应产生的少量水蒸汽，且气体具有一定温度，通过换热器8降温后进入气体干燥剂净化装置9，去除水蒸汽及杂质组分，通过露点检测反馈仪15的调节作用，直至气体露点达-20℃以下。干燥后的还原气体进入混气装置10，根据还原气体浓度检测仪13检测的成分检测结果，适当补充新鲜氢气，因为经过氧化皮要消耗掉少量还原介质，不断检测氢气浓度，并反馈至流量控制阀7进行控制，直至浓度达到设定值。放散阀14，主要是保证混气站安全，根据混气装置的压力检测信号，决定是否通过放散阀14放散。将混合好后的还原气体经一增压泵M喷射进入快冷段6，可采用循环喷射方式并以一定的角度倾斜喷射在带钢表面，用来快速冷却带钢，快冷后被带钢加热的还原气体经另一增压泵M后引入缓冷段5进一步被带钢1预热，然后热的气体进入均热段4和加热段3。进入炉内的还原气体从左(出口)向右(入口)流入预热段2，使热态还原气体的热量逐步传递给冷态带钢，带钢加热同时降低了还原气体自身温度，被降温的还原气体(此时氢气浓度已下降，含水量已升高)从带钢入口段被抽出，开始新的除水、净化、再生(恢复其还原性能)循环。
与现有技术相比，本发明具有如下优点：还原气体中过量的未参与反应的还原介质可100％循环利用，节约能源，降低生产成本；能量可高效利用，经均热段的高温气体可用来加热和预热带钢，而从炉子出口段进入的已被冷却并干燥后的还原气体则可用来冷却热的带钢，还原气体和带钢的热能均能够被有效利用，并且循环利用，污染物排放少，基本可实现零排放，效果十分显著。
应理解，在阅读了本发明的上述讲授内容之后，本领域技术人员可以对本发明作各种改动或修改，这些等价形式同样落于本申请所附权利要求书所限定的范围。

Claims (15)

  1. 一种免酸洗连续退火炉还原气体循环再生利用系统，包括连续退火炉，其具有在带钢传输方向上依次相连通的预热段、加热段、均热段、缓冷段和快冷段，其特征在于，还包括：
    抽风机，设于预热段的带钢入口处，用以将预热段内的还原气体抽出；
    换热器，输入端通过管道与抽风机连接，用以对抽出的还原气体进行换热降温；
    气体干燥剂净化装置，输入端通过管道与换热器连接，用以对还原气体进行去除带钢还原所产生的少量水蒸汽；
    混气装置，一输入端通过管道与气体干燥剂净化装置连接，另一输入端设有还原气体补充管，一输出端通过管道连接至快冷段，通过将干燥后的还原气体与补充的还原气体充分混合形成新的还原气体后，从快冷段输入在连续退火炉内，与带钢逆向而行，并依次对带钢进行快冷段内快速冷却、缓冷段内预热、均热段内退火还原、加热段内加热、预热段内预热的热交换后，再由抽风机抽出至换热器，形成新的循环。
  2. 根据权利要求1所述的免酸洗连续退火炉还原气体循环再生利用系统，其特征在于，还包括两个流量控制阀，其中第一流量控制阀安装在换热器和带钢预热段之间的管道，第二流量控制阀安装在混气装置的还原气体补充管上。
  3. 根据权利要求2所述的免酸洗连续退火炉还原气体循环再生利用系统，其特征在于，还包括数个增压泵，分设于第一流量控制阀与换热器、快冷段与缓冷段、缓冷段分别与加热段、均热段之间的管道上。
  4. 根据权利要求1所述的免酸洗连续退火炉还原气体循环再生利用系统，其特征在于，还包括扰动装置，安装在退火炉的均热段内。
  5. 根据权利要求1所述的免酸洗连续退火炉还原气体循环再生利用系统，其特征在于，还包括两个压力检测装置，分别通过管道与连续退火炉的预热段和混气装置相连，用以检测炉内压力和混气装置的混气压力。
  6. 根据权利要求1所述的免酸洗连续退火炉还原气体循环再生利用系统，其特征在于，还包括还原气体浓度检测仪，设于还原气体补充管上，用以检测补入的还原气体浓度。
  7. 根据权利要求1所述的免酸洗连续退火炉还原气体循环再生利用系统，其特征在于，还包括露点检测装置，通过管道连接于气体干燥剂净化装置和混气装置之间。
  8. 根据权利要求7所述的免酸洗连续退火炉还原气体循环再生利用系统，其特征在于，还包括露点检测反馈仪，安装在气体干燥剂净化装置和露点检测装置之间的管道上。
  9. 根据权利要求1所述的免酸洗连续退火炉还原气体循环再生利用系统，其特征在于，所述连续退火炉内的加热段和均热段，以及均热段和冷却段之间还设有密封辊。
  10. 根据权利要求1所述的免酸洗连续退火炉还原气体循环再生利用系统，其特征在于，还包括放散阀，设于混气装置的另一输出端，用于放散过量的还原气体。
  11. 根据权利要求1所述的免酸洗连续退火炉还原气体循环再生利用系统，其特征在于，所述的加热段和均热段还采用电阻加热、辐射加热、红外加热或感应加热的补充加热方式。
  12. 根据权利要求1所述的免酸洗连续退火炉还原气体循环再生利用系统，其特征在于，所述气体干燥净化装置所采用的干燥介质为分子筛、硅胶、活性氧化铝、无水氯化钙、氧化钙、浓硫酸、五氧化二磷中的任一种。
  13. 一种免酸洗连续退火炉还原气体循环再生利用方法，其特征在于，在权利要求1至12之任一项所述的免酸洗连续退火炉还原气体循环再生利用系统中实施，包括以下步骤：
    从预热段的带钢入口处抽出与带钢预热后的还原气体，并通过压力检测装置将测得炉内压力信号传送到抽风机，以控制抽风机的转速和调节抽气流量；
    通过换热器对被抽出的还原气体进行热交换，进一步降温至后续气体干燥剂净化装置可接受的温度；
    将冷却后的还原气体输入气体干燥剂净化装置进行深度脱水、去除微量杂质、干燥，并输入混气装置内；
    经成分检测后，补入还原气体并充分混合形成新的还原气体后，再从连续退火还原炉的快冷段输入，在整个连续退火炉内与带钢逆向而行，并依次在快冷段内对带钢进行快速冷却，快冷后被带钢加热的气体进入缓冷段对带钢进行缓冷并进一步被带钢预热，预热的气体进入均热段进行还原带钢，再经加热段 和预热段使热态的还原气体逐步传热给冷态带钢，而被降温的还原气体从带钢入口处被抽出，开始新的循环。
  14. 根据权利要求13所述的免酸洗连续退火炉还原气体循环再生利用方法，其特征在于，所述的还原气体经气体干燥净化装置处理后，气体露点达-20℃以下。
  15. 根据权利要求14所述的免酸洗连续退火炉还原气体循环再生利用方法，其特征在于，所述的还原气体经气体干燥净化装置处理后，气体露点达-40℃以下。
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