CN106247811A - A kind of waste heat of flue gas of heating furnace recovery system - Google Patents
A kind of waste heat of flue gas of heating furnace recovery system Download PDFInfo
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- CN106247811A CN106247811A CN201610645077.3A CN201610645077A CN106247811A CN 106247811 A CN106247811 A CN 106247811A CN 201610645077 A CN201610645077 A CN 201610645077A CN 106247811 A CN106247811 A CN 106247811A
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 94
- 239000003546 flue gas Substances 0.000 title claims abstract description 93
- 238000010438 heat treatment Methods 0.000 title claims abstract description 34
- 239000002918 waste heat Substances 0.000 title claims abstract description 17
- 238000011084 recovery Methods 0.000 title claims abstract description 16
- 239000007789 gas Substances 0.000 claims abstract description 32
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 29
- 239000010959 steel Substances 0.000 claims abstract description 29
- 238000009413 insulation Methods 0.000 claims abstract description 14
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 238000009933 burial Methods 0.000 claims 6
- 238000004321 preservation Methods 0.000 abstract description 42
- 238000007254 oxidation reaction Methods 0.000 abstract description 6
- 230000003647 oxidation Effects 0.000 abstract description 5
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 229910052760 oxygen Inorganic materials 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 230000001681 protective effect Effects 0.000 abstract description 2
- 238000010583 slow cooling Methods 0.000 description 14
- 238000000034 method Methods 0.000 description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 238000002485 combustion reaction Methods 0.000 description 6
- 239000003034 coal gas Substances 0.000 description 5
- 230000001105 regulatory effect Effects 0.000 description 5
- 238000009749 continuous casting Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000005485 electric heating Methods 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- -1 composed of CO 2 Chemical compound 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
- F27D17/10—Arrangements for using waste heat
-
- 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
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/15—On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply
Landscapes
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
- Air Supply (AREA)
Abstract
本发明公开了一种加热炉烟气余热回收系统，包括加热炉、烟气主管、引风机和钢坯保温装置，加热炉的烟气出口与烟气主管连通，烟气主管的末端与烟囱相连；烟气主管上设有烟气支管，烟气支管与引风机的入口连通，引风机的出口与钢坯保温装置的内部连通，钢坯保温装置经出口管道与烟气主管的下游连通；钢坯保温装置内置有钢坯。本发明的有益效果为：本系统将中低温烟气引入钢坯保温装置内，一方面对钢坯进行保温，钢坯在具有该温度的烟气中散热慢，保温效果好，节约了后续加工能耗，降低了生产成本；另一方面，烟气中的CO2、H2O和N2等气体在钢坯保温装置内形成保护氛围，与空气相比氧化性能弱，大大降低了钢坯的氧化烧损。
The invention discloses a heating furnace flue gas waste heat recovery system, which comprises a heating furnace, a flue gas main pipe, an induced draft fan and a billet heat preservation device, the flue gas outlet of the heating furnace is connected with the flue gas main pipe, and the end of the flue gas main pipe is connected with a chimney; The flue gas main pipe is provided with a flue gas branch pipe, the flue gas branch pipe is connected with the inlet of the induced draft fan, the outlet of the induced draft fan is connected with the interior of the billet heat preservation device, and the billet heat preservation device is connected with the downstream of the flue gas main pipe through the outlet pipe; the billet heat preservation device is built-in There are billets. The beneficial effects of the present invention are: the system introduces medium and low temperature flue gas into the steel billet heat preservation device, on the one hand heats the steel billet, the billet dissipates heat slowly in the flue gas with this temperature, has good heat preservation effect, and saves subsequent processing energy consumption, The production cost is reduced; on the other hand, gases such as CO 2 , H 2 O and N 2 in the flue gas form a protective atmosphere in the billet insulation device, which has weaker oxidation performance than air, greatly reducing the oxidation and burning loss of the billet.
Description
技术领域technical field
本发明涉及冶金行业余热回收技术领域，具体涉及一种加热炉烟气余热回收系统。The invention relates to the technical field of waste heat recovery in the metallurgical industry, in particular to a heating furnace flue gas waste heat recovery system.
背景技术Background technique
在钢铁生产中，钢坯轧制前加热是能耗特别大的工序，在这一工序中会产生大量的高温烟气，目前多采用换热器对高温烟气余热进行回收。In iron and steel production, heating the steel billet before rolling is a process that consumes a lot of energy. In this process, a large amount of high-temperature flue gas will be generated. At present, heat exchangers are often used to recover the waste heat of high-temperature flue gas.
加热炉烟气余热回收的过程为：连铸坯在加热炉内加热到1250℃~1300℃，燃烧产生的主要成分为CO2、H2O和N2等的高温烟气与炉内钢坯进行热交换后进入烟道，再经空气换热器和煤气换热器与助燃空气、煤气交换热量后经烟囱排入大气。在这个过程中，进入空气换热器的烟气温度为850℃～950℃，经空气换热器与常温空气交换热量后的烟气温度为600℃～750℃，经煤气换热器与常温煤气交换热量后的烟气温度为350℃～450℃。由于350℃～450℃的温度范围较低，烟气热量难以再利用而直接向烟气排入大气，排入大气部分的热量占加热炉能耗的30%，一方面造成了能源的浪费，另一方面也造成了严重的热污染问题。The process of waste heat recovery from heating furnace flue gas is as follows: the continuous casting slab is heated to 1250°C~1300°C in the heating furnace, and the high-temperature flue gas mainly composed of CO 2 , H 2 O and N 2 produced by combustion is carried out with the steel slab in the furnace. After heat exchange, it enters the flue, and then exchanges heat with combustion-supporting air and gas through the air heat exchanger and gas heat exchanger, and then discharges into the atmosphere through the chimney. In this process, the temperature of the flue gas entering the air heat exchanger is 850°C to 950°C, the temperature of the flue gas after exchanging heat with the air at normal temperature is 600°C to 750°C, and the temperature of the flue gas after passing through the gas heat exchanger and normal temperature The temperature of the flue gas after the heat exchange of the coal gas is 350°C to 450°C. Due to the low temperature range of 350°C to 450°C, the heat of the flue gas is difficult to reuse and is directly discharged into the atmosphere. The heat discharged into the atmosphere accounts for 30% of the energy consumption of the heating furnace. On the one hand, it causes a waste of energy. On the other hand, it also caused serious thermal pollution problems.
此外，为了提高连铸坯热送热装温度，很多钢铁厂在输送辊道上加设保温罩，然而这种保温罩存在两个问题：一、保温罩内充满了由周围环境进入的常温空气，高温钢坯向常温空气散热，钢温损失大，热送温度不高，能源消耗大；二、罩内的空气氧化性强，其与热铸坯表面发生氧化反应，产生大量的氧化铁皮，金属损耗大。为了提高铸坯温度，部分钢铁企业采用煤气加热或电加热补热装置对铸坯进行补热。如专利CN204770540U中公开了一种连铸坯在线保温补热装置，该装置在输运辊道上安装燃烧器，利用燃烧器喷出的火焰直接喷射对铸坯进行加热；这种加热方式需要一套燃烧系统，系统复杂，投资大；火焰温度高，排烟温度高，热效率很低，主要应用于直接轧制工艺，对于应用最广泛的热送热装工艺来说并不适用。专利CN103464463A中公开了一种连铸连轧一体装置及工艺，该工艺采用感应电加热的方式对铸坯进行补热，加热罩内的气氛为空气，仍然存在铸坯氧化烧损大的问题。In addition, in order to increase the temperature of hot delivery and hot charging of continuous casting slabs, many iron and steel plants add heat preservation covers on the conveying roller table. However, there are two problems with this heat preservation cover: 1. The heat preservation cover is filled with normal temperature air entering from the surrounding environment. The high-temperature billet dissipates heat to the normal-temperature air, resulting in a large loss of steel temperature, low heat transfer temperature, and high energy consumption; 2. The air in the hood is highly oxidative, and it reacts with the surface of the hot casting billet to generate a large amount of oxide scale and metal loss Big. In order to increase the temperature of the slab, some iron and steel enterprises use gas heating or electric heating to supplement the heat of the slab. For example, patent CN204770540U discloses a continuous casting slab online heat preservation and heating device. The device installs a burner on the transport roller table, and uses the direct injection of flame from the burner to heat the slab; this heating method requires a set of The combustion system is complex and requires a large investment; the flame temperature is high, the exhaust gas temperature is high, and the thermal efficiency is very low. It is mainly used in the direct rolling process, and it is not suitable for the most widely used hot delivery and hot charging process. Patent CN103464463A discloses a continuous casting and rolling integrated device and process. This process uses induction electric heating to supplement the heat of the billet. The atmosphere in the heating hood is air, and there is still the problem of large oxidation and burning of the billet.
发明内容Contents of the invention
本发明的目的在于，针对现有技术的不足，提供一种可用于钢坯保温的加热炉烟气余热回收系统。The object of the present invention is to provide a heating furnace flue gas waste heat recovery system that can be used for steel slab heat preservation, aiming at the deficiencies of the prior art.
本发明采用的技术方案是：一种加热炉烟气余热回收系统，包括加热炉、烟气主管、引风机和钢坯保温装置，所述加热炉的烟气出口与烟气主管连通，烟气主管的末端与烟囱相连；烟气主管上设有烟气支管，烟气支管与引风机的入口连通，引风机的出口与钢坯保温装置的内部连通，钢坯保温装置经出口管道与烟气主管的下游连通；所述钢坯保温装置内置有钢坯。The technical solution adopted in the present invention is: a heating furnace flue gas waste heat recovery system, including a heating furnace, a flue gas main pipe, an induced draft fan and a billet heat preservation device, the flue gas outlet of the heating furnace is connected with the flue gas main pipe, and the flue gas main pipe The end of the flue gas pipe is connected to the chimney; the flue gas main pipe is provided with a flue gas branch pipe, and the flue gas branch pipe is connected with the inlet of the induced draft fan, and the outlet of the induced draft fan is connected with the interior of the billet heat preservation device, and the billet heat preservation device is connected to the downstream of the flue gas main pipe through the outlet pipe. Connected; the steel billet heat preservation device is built with a steel billet.
按上述方案，所述保温装置为保温罩，保温罩安设在运输辊道上，保温罩与运输辊道形成封闭空间，该密闭空间内放置钢坯；保温罩的一侧设有进气口，进气口与烟气支管连通，烟气支管上配置有调节阀；保温罩的另一侧设有出气口，出气口与出气管道连通。According to the above scheme, the heat preservation device is a heat preservation cover, and the heat preservation cover is installed on the transport roller table, and the heat preservation cover and the transport roller table form a closed space, and steel billets are placed in the closed space; one side of the heat preservation cover is provided with an air inlet, The gas port is connected with the flue gas branch pipe, and the flue gas branch pipe is equipped with a regulating valve; the other side of the heat preservation cover is provided with a gas outlet, and the gas outlet is connected with the gas outlet pipe.
按上述方案，所述保温罩配置有压力表。According to the above scheme, the heat preservation cover is equipped with a pressure gauge.
按上述方案，所述保温罩包括壳体，壳体内部设置有保温层。According to the above solution, the heat preservation cover includes a shell, and a heat insulation layer is arranged inside the shell.
按上述方案，所述保温装置为缓冷坑，缓冷坑内置有钢坯；缓冷坑的一侧设有进气口，进气口与烟气支管连通，烟气支管上配置有调节阀；缓冷坑的另一侧设有出气口，出气口与出气管道连通。According to the above scheme, the heat preservation device is a slow cooling pit, and a steel billet is built in the slow cooling pit; one side of the slow cooling pit is provided with an air inlet, and the air inlet is connected with the flue gas branch pipe, and the flue gas branch pipe is equipped with a regulating valve; The other side of the slow cooling pit is provided with an air outlet, and the air outlet communicates with the air outlet pipeline.
按上述方案，所述缓冷坑配置有压力表。According to the above solution, the slow cooling pit is equipped with a pressure gauge.
按上述方案，所述缓冷坑的进气口开设在一侧下部，缓冷坑的出气口开设在另一侧上部。According to the above scheme, the air inlet of the slow cooling pit is opened at the lower part of one side, and the air outlet of the slow cooling pit is opened at the upper part of the other side.
按上述方案，所述系统配置有换热装置，换热装置安设在烟气支管上游的烟气主管上；所述换热装置包括依次与烟气主管连通的空气换热器和煤气换热器，空气换热器与供风管道相连，煤气换热器与煤气管道相连。According to the above scheme, the system is equipped with a heat exchange device, which is installed on the flue gas main pipe upstream of the flue gas branch pipe; The air heat exchanger is connected with the air supply pipeline, and the gas heat exchanger is connected with the gas pipeline.
本发明的有益效果为：The beneficial effects of the present invention are:
（1）本系统可先回收加热炉中烟气的部分热量，再将350℃~450℃的中低温烟气引入钢坯保温装置内，一方面对钢坯进行保温，钢坯在具有该温度的烟气中散热慢，保温效果好，节约了后续加工能耗，降低了生产成本；另一方面，烟气中的CO2、H2O和N2等气体在钢坯保温装置内形成保护氛围，与空气相比氧化性能弱，大大降低了钢坯的氧化烧损。(1) This system can recover part of the heat of the flue gas in the heating furnace first, and then introduce the medium and low temperature flue gas at 350°C~450°C into the billet heat preservation device. On the one hand, it can keep the billet warm. Slow heat dissipation in the middle, good heat preservation effect, saving subsequent processing energy consumption, and reducing production costs ; Compared with the weak oxidation performance, the oxidation burning loss of the billet is greatly reduced.
（2）本系统中钢坯保温装置无需作大改造，设备投入少，成本低。(2) The steel billet heat preservation device in this system does not need to be greatly modified, and the equipment investment is small and the cost is low.
附图说明Description of drawings
图1为本发明的结构示意图。Fig. 1 is a structural schematic diagram of the present invention.
图2为保温罩的结构示意图。Fig. 2 is a structural schematic diagram of the heat preservation cover.
图3为缓冷坑的结构示意图。Figure 3 is a schematic diagram of the structure of the slow cooling pit.
其中：1、加热炉；2、空气换热器；3、供风管道；4、煤气换热器；5、煤气管道；6、烟气主管；7、钢坯保温装置；8、烟囱；9、调节阀；10、烟气支管；11、引风机；12、压力表；13、保温罩；14、出气管道；15、运输辊道；16、钢坯；17、缓冷坑。Among them: 1. Heating furnace; 2. Air heat exchanger; 3. Air supply pipeline; 4. Gas heat exchanger; 5. Gas pipeline; 6. Flue gas main pipe; 7. Billet insulation device; 8. Chimney; Regulating valve; 10. Flue gas branch pipe; 11. Induced fan; 12. Pressure gauge; 13. Insulation cover; 14. Outlet pipe; 15. Transport roller table; 16. Billet;
具体实施方式detailed description
为了更好地理解本发明，下面结合附图和具体实施例对本发明作进一步地描述。In order to better understand the present invention, the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
如图1所示的一种加热炉烟气余热回收系统，包括加热炉1、烟气主管6、引风机11和钢坯保温装置7，加热炉1的烟气出口与烟气主管6连通，烟气主管6的末端与烟囱8相连；烟气主管6上设有烟气支管10，烟气支管10与引风机11的入口连通，引风机11的出口与钢坯保温装置7的内部连通，钢坯保温装置7经出口管道14与烟气主管6的下游连通；所述钢坯保温装置7内置有钢坯16。A heating furnace flue gas waste heat recovery system as shown in Figure 1 includes a heating furnace 1, a flue gas main pipe 6, an induced draft fan 11 and a billet heat preservation device 7, the flue gas outlet of the heating furnace 1 is connected with the flue gas main pipe 6, and the flue gas The end of the gas main pipe 6 is connected to the chimney 8; the flue gas main pipe 6 is provided with a flue gas branch pipe 10, and the flue gas branch pipe 10 is connected with the inlet of the induced draft fan 11, and the outlet of the induced draft fan 11 is connected with the inside of the billet heat preservation device 7, and the billet heat preservation The device 7 communicates with the downstream of the flue gas main pipe 6 through the outlet pipe 14; the steel billet heat preservation device 7 has a steel billet 16 inside.
如图2所示，所述保温装置7为保温罩13，保温罩13安设在钢坯7的运输辊道15上，保温罩13与运输辊道15形成封闭空间，该密闭空间内放置钢坯7；保温罩13的一侧设有进气口，进气口与烟气支管10连通，烟气支管10上配置有调节阀9；保温罩13的另一侧设有出气口，出气口与出气管道14连通。所述保温罩13外设有压力表12，用于监测保温罩13内的气体压力；保温罩13包括壳体，壳体内部设置有保温层。As shown in Figure 2, the heat preservation device 7 is a heat preservation cover 13, and the heat preservation cover 13 is installed on the transportation roller table 15 of the steel billet 7, and the heat preservation cover 13 and the transportation roller table 15 form a closed space, and the steel billet 7 is placed in the closed space. One side of the thermal insulation cover 13 is provided with an air inlet, and the air inlet is connected with the flue gas branch pipe 10, and the flue gas branch pipe 10 is provided with a regulating valve 9; Pipeline 14 communicates. The heat preservation cover 13 is provided with a pressure gauge 12 for monitoring the gas pressure in the heat preservation cover 13; the heat preservation cover 13 includes a shell, and an insulation layer is arranged inside the shell.
如图3所示，所述保温装置7为缓冷坑17，缓冷坑17配置有压力表12，缓冷坑17内置有钢坯16；缓冷坑17的一侧设有进气口，进气口与烟气支管10连通，烟气支管10上配置有调节阀9；缓冷坑17的另一侧设有出气口，出气口与出气管道14连通。优选地，所述缓冷坑17的进气口开设在一侧下部，缓冷坑17的出气口开设在另一侧上部。As shown in Figure 3, described thermal insulation device 7 is slow cooling pit 17, and slow cooling pit 17 is equipped with pressure gauge 12, and slow cooling pit 17 is built-in steel billet 16; One side of slow cooling pit 17 is provided with air inlet, enters The gas port communicates with the flue gas branch pipe 10, and the flue gas branch pipe 10 is equipped with a regulating valve 9; Preferably, the air inlet of the slow cooling pit 17 is opened at the lower part of one side, and the air outlet of the slow cooling pit 17 is opened at the upper part of the other side.
本实施例中，所述系统配置有换热装置，换热装置安设在烟气支管10上游的烟气主管6上；所述换热装置包括空气换热器2和煤气换热器4，空气换热器2与供风管道3相连，煤气换热器4与煤气管道5相连；所述烟气主管6依次与空气换热器2和煤气换热器4连通，烟气先与空气换热器2内的空气进行热交换（与空气换热后的烟气温度为600℃～750℃），换热后的空气作为助燃气体鼓入燃烧系统参与燃烧反应；烟气再与煤气换气热4内的煤气进行热交换（与煤气换热后的烟气温度为450℃~550℃），换热后的煤气作为燃料介质鼓入燃烧系统参与燃烧反应。In this embodiment, the system is equipped with a heat exchange device, which is installed on the flue gas main pipe 6 upstream of the flue gas branch pipe 10; the heat exchange device includes an air heat exchanger 2 and a gas heat exchanger 4, The air heat exchanger 2 is connected with the air supply pipeline 3, and the gas heat exchanger 4 is connected with the gas pipeline 5; The air in the heater 2 performs heat exchange (the temperature of the flue gas after heat exchange with air is 600°C-750°C), and the air after heat exchange is blown into the combustion system as a combustion-supporting gas to participate in the combustion reaction; the flue gas is then exchanged with coal gas The coal gas in heat 4 is heat-exchanged (the flue gas temperature after heat exchange with the coal gas is 450°C~550°C), and the heat-exchanged coal gas is blown into the combustion system as a fuel medium to participate in the combustion reaction.
本发明的工作原理为：从加热炉1排出的烟气（烟气主要成分为H2O、CO2及N2，烟气温度为850℃～950℃）进入烟气主管6，依次经空气换热器和煤气换热器换热后，温度降低为450℃~550℃；部分降温后的烟气经烟气主管6直接进入烟囱8，另一部分的降温烟气经引风机11进入钢坯保温装置7内，一方面烟气中的CO2及N2等在钢坯16周围形成保护性气氛，包覆钢坯16，使其隔绝氧气，避免钢坯16表面发生氧化反应；另一方面烟气对钢坯16起加热保温作用；最后，钢坯保温装置7内的烟气经出气管道14汇入烟气主管6，与其他烟气混合进入烟囱8排入大气。The working principle of the present invention is: the flue gas discharged from the heating furnace 1 (the main components of the flue gas are H 2 O, CO 2 and N 2 , and the temperature of the flue gas is 850°C-950°C) enters the flue gas main pipe 6, and passes through the air in turn. After heat exchange between the heat exchanger and the gas heat exchanger, the temperature drops to 450°C~550°C; part of the cooled flue gas enters the chimney 8 directly through the flue gas main pipe 6, and the other part of the cooled flue gas enters the billet through the induced draft fan 11 for heat preservation In the device 7, on the one hand, CO2 and N2 in the flue gas form a protective atmosphere around the steel billet 16, covering the steel billet 16, making it isolated from oxygen, and avoiding the oxidation reaction on the surface of the steel billet 16; 16 plays the role of heating and heat preservation; finally, the flue gas in the billet heat preservation device 7 flows into the flue gas main pipe 6 through the gas outlet pipe 14, and enters the chimney 8 mixed with other flue gases to be discharged into the atmosphere.
以上仅为本发明的优选实施例，并不用于限制本发明的专利范围，凡是利用本发明说明书及附图内容所做的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the description of the present invention and the contents of the accompanying drawings, or directly or indirectly used in other related All technical fields are equally included in the scope of patent protection of the present invention.
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| CN115780793A (en) * | 2022-11-22 | 2023-03-14 | 武汉钢铁有限公司 | Vacuum heat-insulation hot-rolled steel billet heat preservation chamber and control method thereof |
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