CN203174129U - Flue gas self-circulation combustion system of blast furnace hot blast stove - Google Patents

Flue gas self-circulation combustion system of blast furnace hot blast stove Download PDF

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Publication number
CN203174129U
CN203174129U CN 201320097947 CN201320097947U CN203174129U CN 203174129 U CN203174129 U CN 203174129U CN 201320097947 CN201320097947 CN 201320097947 CN 201320097947 U CN201320097947 U CN 201320097947U CN 203174129 U CN203174129 U CN 203174129U
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China
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blast
flue gas
hot
combustion
gas
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CN 201320097947
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Chinese (zh)
Inventor
刘俭
王卫东
方音
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江苏沙钢集团有限公司
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Publication of CN203174129U publication Critical patent/CN203174129U/en

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Abstract

The utility model discloses a flue gas self-circulation combustion system of a blast furnace hot blast stove. The system comprises a hot-blast main pipe and a flue gas main pipe which are communicated with the hot blast stove, a hot-blast lead-out branch pipe and a flue gas lead-out branch pipe which are respectively communicated with the hot-blast main pipe and the flue gas main pipe. High-temperature air and flue gas are led out of the hot-blast main pipe and the flue gas main pipe through the hot-blast lead-out branch pipe and the flue gas lead-out branch pipe, the led-out high-temperature air and flue gas are mixed in the air mixing chamber to form hot blast stove combustion-supporting gas, and the hot blast stove combustion-supporting gas is input into the hot blast stove combustion chamber and is mixed and combusted with blast furnace gas so as to obtain high-temperature air. A combustion fan and a combustion-supporting air preheater are omitted on the basis that the existing hot blast stove basic process structure is not changed; due to the arranged hot-blast lead-out branch pipe, the flue gas lead-out branch pipe, the induced draft fan, the air mixing chamber and other miniature equipment, high air temperature can be realized, and the system is suitable for hot blast stoves (internal combustion, external combustion or top combustion) in any form.

Description

Blast-furnace hot-air kiln gas self-circulation firing system

Technical field

The utility model is particularly related to a kind of blast-furnace hot-air kiln gas self-circulation firing system, is applicable to any type of hotblast stove (internal combustion, external combustion or top combustion, 3 or 4 configurations), belongs to technical field of metallurgy industry.

Background technology

In the blast furnace iron-making process, an energy-saving and cost-reducing valid approach be exactly improve blast furnace go into the stove wind-warm syndrome.The improvement of wind-warm syndrome can improve combustion intensity, reduce ratio of putting coke into furnace, and ton iron energy consumption is reduced, and also can improve the iron amount of producing.Think that in theory wind-warm syndrome raises 100 ℃, can reduce coke ratio 8 ~ 15kg/t-Fe, many coal injection 20 ~ 30kg/t-Fe improve output 3 ~ 5%.

Modern blast furnace generally adopts regenerative hot blast stove heating air blast.Hotblast stove is made up of regenerator and combustion chamber two portions.Work period comprises burning phase and on air.In the burning phase, the high-temperature flue gas heating regenerator lattice brick that utilizes gas-fired to produce makes checker brick deposit heat, changes stove then extremely on air.High-temperature flue gas temperature after the checker brick heat absorption is down to 300-400 ℃ by the total tube drainage of flue gas.On air the heat energy that then discharges the checker brick deposit heats cold wind rapidly, delivers to blast furnace by hot air duct again and uses.For satisfying continuity and the reliability that blast furnace is produced, 3 ~ 4 hotblast stoves of blast furnace one general configuration.

Along with the development of ironmaking technology, use high wind-warm syndrome to become the important technology feature of modern blast furnace.Modern hotblast stove will be realized the high wind-warm syndrome more than 1250 ℃, and the life-span was greater than 30 years, will reduce CO simultaneously 2, NO XDeng the discharging of pollutent, save energy realizes long-service life high-efficiency.Further, be accompanied by the oxygen coal and strengthen applying of ironmaking novel process, blast furnace is more urgent to the demand of high wind-warm syndrome, and therefore, hotblast stove gets the status in blast furnace is produced more and more important.Meanwhile, follow improving constantly of blast furnace facility modernization level and integrated smelting state of the art, the comprehensive fuel ratio of blast furnace is able to remarkable reduction, makes the calorific value of blast furnace gas be down to 3000kJ/m 3Low-level, do not adopt householder method, can't reach higher blast furnace air temperature.

Fairly simple terms of settlement is that the method with addition of high heating value gas realizes in blast furnace gas.Such as the outside combustion stove of Baosteel, by in blast furnace gas with addition of 5~10% coke-oven gas, theoretical combustion temperature is reached more than 1420 ℃, thereby realizes 1250~1270 ℃ of average annual hot blast temperatures.

Domestic is the ultrahigh-temperature hotblast stove technology of representative with the Shoudu Iron and Steel Co, mainly is by combustion air, blast furnace gas being preheating to 600 ℃ and 180 ℃ respectively, making theoretical combustion temperature be higher than 1450 ℃, guaranteeing that blast furnace stably obtains 1250 ℃ and above wind-warm syndrome.Shoudu Iron and Steel Co prince wife Cao pasture 5500m 3Blast furnace and move steel 4000m 3The hotblast stove of blast furnace is respectively on the basis of 4 top combustion stoves and 4 Cowper stoves, and each comes warm-up combustion-supporting air to 600 ℃ with addition of 2 little hotblast stoves, and adopts traditional fume afterheat to utilize technology to come preheating blast furnace gas to 180 ℃.This method has not only increased the extra investment of little hot blast stove system, has also increased floor space, and makes the process complications of hot blast stove system, and has significantly increased the system radiating loss.

The conventional art close with the utility model intention is the mode of utilizing the hotblast stove self-preheating, after cardinal principle is the hotblast stove air-supply, utilizes the interior waste heat of stove that the combustion air of hotblast stove is preheating to more than 500 ℃.This technology must dispose 4 hotblast stoves, and operating duty is " two burn one send a preheating ", after namely a hotblast stove is blown, changes preheating oven heating combustion air into, delivers to another Combustion of Hot Air Furnace.Because this method has increased the complexity of hotblast stove pipeline and the difficulty of overhaul of the equipments, operation produces considerable influence to Combustion of Hot Air Furnace simultaneously, does not obtain promoting.

Postscript, aforesaid existing hotblast stove is conventional hotblast stove, and its combustion principle and feature do not have essential distinction.Along with the raising of hotblast stove dome temperature, NO XGeneration will sharply accelerate, cause unfavorable situations such as furnace shell intergranular stress corrosion, contaminate environment, therefore design and develop out the conventional Combustion of Hot Air Furnace process of a kind of changes, further improve wind-warm syndrome, reduction CO 2, NO XThe high-temperature low-oxygen long-service life high-efficiency hotblast stove of discharging has become an urgent demand that overcomes above-mentioned technological deficiency.

The utility model content

At deficiency of the prior art, the purpose of this utility model mainly is to provide a kind of blast-furnace hot-air kiln gas self-circulation combustion method and system, it only depends on single blast furnace gas to make the high wind-warm syndrome that fuel can obtain 1250 ~ 1300 ℃, can realize high-temperature and low-oxygen combustion simultaneously, less investment, process equipment manipulation is simple, utilization rate of waste heat is high, hotblast stove long service life, NO XPollute little.

For realizing above-mentioned utility model purpose, the utility model has adopted following technical scheme:

A kind of blast-furnace hot-air kiln gas self-circulation combustion method, comprise: utilize at least one hot blast to draw arm and at least one flue gas respectively and draw arm and from hot-blast main and flue gas house steward, draw high temperature air and flue gas, and derivative high temperature air and derivative flue gas mixed in wind mixed chamber form the Combustion of Hot Air Furnace combustion-supporting gas, then with this Combustion of Hot Air Furnace combustion-supporting gas input Combustion of Hot Air Furnace chamber, and with blast furnace gas mixed firing, obtain 1250 ~ 1300 ℃ high wind-warm syndrome.

Preferably, described Combustion of Hot Air Furnace combustion-supporting gas is mixed by the flue gas that the high temperature air after the hotblast stove heating and hot blast stove burning generate at least.

Further, the oxygen level of described Combustion of Hot Air Furnace combustion-supporting gas is that 5 ~ 15wt%, temperature are more than 600 ℃.

Described hot blast is drawn arm and flue gas and is drawn and be equipped with at least one trip valve and at least one variable valve on the arm.

A kind of blast-furnace hot-air kiln gas self-circulation firing system, comprise the hot-blast main that is communicated with hotblast stove and flue gas house steward and at least one hot blast that is communicated with hot-blast main and flue gas house steward respectively draws arm and at least one flue gas is drawn arm, described hot blast is drawn arm and flue gas and is drawn arm and also all be communicated with wind mixed chamber, and described wind mixed chamber is communicated with the combustion chamber of hotblast stove.

Preferably, described hot blast is drawn arm and flue gas and is drawn and be equipped with at least one trip valve and at least one variable valve on the arm.

Preferably, described flue gas is drawn and also is provided with 1 above induced draft fan on the arm, such as, can be the induced draft fan of two parallel connections.

Further, described flue gas is drawn arm and is communicated with wind mixed chamber through the flue gas arm.

Preferably, described flue gas house steward also is communicated with the preheater smoke inlet pipeline of gas preheating device, and the preheater exhanst gas outlet pipeline of described gas preheating device is communicated with chimney.

Described flue gas draw arm, flue gas arm, wind mixed chamber and be located at wind mixed chamber and the combustion chamber of hotblast stove between connecting tube refractory lining all is installed.

Combustion of Hot Air Furnace combustion-supporting gas described in the utility model is owing to the CO that has in the flue gas 2, N 2Deng the non-active ingredient dilution, formation contains the oxysome volume concentrations and is lower than 15% high-temperature low-oxygen atmosphere, enters the high-temperature and low-oxygen combustion that coal gas is realized in the combustion chamber, and no longer there is the localized hyperthermia's high-nitrogen area that occurs in the traditional combustion process in combustion processes, NO XGeneration be suppressed.The burned flame volume increases under the hypoxic atmosphere simultaneously, forms the same high temperature severe radiation black matrix at acquisition high temperature that is evenly distributed in whole combustion chamber, and heat transfer efficiency significantly improves, NO in the flue gas XQuantity discharged reduces, also consumption capable of saving fuel, the corresponding CO that reduces 2Discharging.

The ultimate principle of the high-temperature gas combustion technology that the utility model adopts is that coal gas is burnt in high-temperature low-oxygen volumetric concentration atmosphere.Coal gas forms and the diverse thermodynamic condition of traditional combustion process in high-temperature low-oxygen atmosphere, doing to delay to discharge heat energy under the shape burning with low-oxygen gas, no longer has the localized hyperthermia hyperoxia district in the traditional combustion process.

Hotblast stove high-temperature and low-oxygen combustion mode makes on the one hand that combustion chamber temperature is whole to raise and distribute more evenly, and gas consumption is significantly reduced, and reduces gas consumption and also just means the corresponding CO that reduced 2Discharging; Effectively suppressed heating power type NO on the other hand XGeneration.NO XBe the important substance that causes topsoil, whole world every profession and trade is all managing to reduce NO XDischarging.NO XMainly contain heating power type and fuel type.Hotblast stove adopts geseous fuel, and wherein nitrogenous compound is few, so fuel type NO XGenerate few.Because heating power type NO XFormation speed mainly relevant with peak flame temperature and the concentration of nitrogen, oxygen in the combustion processes, wherein temperature is to influence heating power type NO XThe principal element of growing amount.Under the high-temperature air burning condition, because medial temperature raises in the hotblast stove, but there is not the localized hyperthermia district of traditional combustion, to heating power type NO XGenerate inhibited.

Compared with prior art, the beneficial effects of the utility model are at least: (1) single fire blast furnace gas can realize 1250-1300 ℃ because the high wind-warm syndrome of flue gas; (2) directly mix with high temperature air, without the interchanger heat exchange, fume afterheat utilization ratio height; (3) less investment, cost are low, and the utility model only increases bantams such as some hot blast fairleads, induced draft fan can realize high wind-warm syndrome function; (4) NO XPollute for a short time, high-temperature and low-oxygen combustion can effectively suppress NO XGenerate; (5) hotblast stove long service life, the utility model can reduce and prevent that intergranular stress corrosion is to the harm of hot-air stove shell.

Description of drawings

Fig. 1 is the structural representation of blast-furnace hot-air kiln gas self-circulation firing system in the utility model one preferred embodiment;

Description of reference numerals: 1-flue gas house steward, the 2-gas line, 3-combustion-supporting gas pipeline, 4-hot-blast main, 5-flue gas arm, flue gas arm behind the 6-induced draft fan, 7-wind mixed chamber, 8-hot blast manifold, 9-preheater smoke inlet pipeline, 10-flue by-pass line, 11-preheater exhanst gas outlet pipeline, 12-hotblast stove, 13-gas preheating device, 14-chimney, 15-blast furnace, A-blast furnace gas, B-combustion-supporting gas, C-flue gas.

Embodiment

Below in conjunction with accompanying drawing and a preferred embodiment the technical solution of the utility model is further described.

Consulting shown in Figure 1 is the structural representation of present embodiment blast-furnace hot-air kiln gas self-circulation firing system, draw arm 8 by establishing a hot blast hot-blast main 4, hot blast is drawn arm 8 and is provided with a trip valve and a variable valve, and hot blast is drawn arm 8 refractory lining is installed; Establish a flue gas flue gas house steward 1 and draw arm 5, flue gas is drawn the induced draft fan (the using and the reserved) that arm 5 is provided with a trip valve, a variable valve and two parallel connections, make the flue gas of drawing reach required pressure and enter flue gas arm 6, flue gas draws arm 5 and flue gas arm 6 is equipped with refractory lining; Hot blast is drawn arm 8 and is connected with two entrances of wind mixed chamber 7 respectively with flue gas arm 6, wind mixed chamber's outlet conduit 3 is told the arm of equal amts by the hotblast stove quantity of configuration, be equipped with a trip valve on each arm, be connected with Combustion of Hot Air Furnace chamber combustion-supporting gas entrance respectively, will mix combustion-supporting gas and send into hot-blast stove gas burner.Connecting tube between wind mixed chamber and wind mixed chamber and the Combustion of Hot Air Furnace chamber all is equipped with the liner of refractory materials.

In the course of the work, can be required according to technology, the Combustion of Hot Air Furnace combustion-supporting gas is mixed by the high temperature air of 30 ~ 70V/V% and the flue gas of 70 ~ 30 V/V %.High temperature air is drawn by the hot-blast main, and flue gas is drawn by the flue gas house steward, mixes forming in proportion at mixing section.Because this partial fume is direct and high temperature air mixes, the UTILIZATION OF VESIDUAL HEAT IN efficient of flue gas significantly improves, that is, the flue gas recirculation rate is up to 30-70%, circulating flue gas does not still carry out preheating by preheater to coal gas by traditional method, makes the gas temperature that enters the combustion chamber reach 180 ℃.

Further, aforementioned Combustion of Hot Air Furnace combustion-supporting gas be oxygen level 5 ~ 15%, temperature at the high-temperature low-oxygen combustion-supporting gas more than 600 ℃, this high-temperature low-oxygen combustion-supporting gas and blast furnace gas mixed firing obtain 1250 ~ 1300 ℃ high wind-warm syndrome.

The utility model is on the basis that does not change existing hotblast stove basic technology structure, burner blower and combustion air preheater have been cancelled, draw arm by increasing hot blast, flue gas is drawn bantams such as arm, induced draft fan, wind mixed chamber can realize high wind-warm syndrome, and the utility model is applicable to any type of hotblast stove (internal combustion, external combustion or top combustion).

It is to be noted; above-described embodiment only is explanation technical conceive of the present utility model and characteristics; its purpose is to allow the personage who is familiar with this technology can understand content of the present utility model and enforcement according to this; can not limit protection domain of the present utility model with this; all equivalences of doing according to the utility model spirit change or revise, and all should be encompassed within the protection domain of the present utility model.

Claims (6)

1. blast-furnace hot-air kiln gas self-circulation firing system, comprise the hot-blast main (4) and the flue gas house steward (1) that are communicated with hotblast stove (12), it is characterized in that, it comprises that also at least one hot blast that is communicated with hot-blast main (4) and flue gas house steward (1) is respectively drawn arm (8) and at least one flue gas is drawn arm (5), described hot blast draws arm (8) and flue gas is drawn arm (5) and all be communicated with wind mixed chamber (7), and described wind mixed chamber (7) is communicated with the combustion chamber of hotblast stove (12).
2. blast-furnace hot-air kiln gas self-circulation firing system according to claim 1 is characterized in that, described hot blast is drawn arm (8) and flue gas and drawn and be equipped with at least one trip valve and at least one variable valve on the arm (5).
3. blast-furnace hot-air kiln gas self-circulation firing system according to claim 2 is characterized in that, described flue gas is drawn and also is provided with 1 above induced draft fan on the arm (5).
4. blast-furnace hot-air kiln gas self-circulation firing system according to claim 3 is characterized in that, described flue gas is drawn arm (5) and is communicated with wind mixed chamber (7) through flue gas arm (6).
5. blast-furnace hot-air kiln gas self-circulation firing system according to claim 1, it is characterized in that, described flue gas house steward (1) also is communicated with the preheater smoke inlet pipeline (9) of gas preheating device (13), and the preheater exhanst gas outlet pipeline (11) of described gas preheating device (13) is communicated with chimney (14).
6. blast-furnace hot-air kiln gas self-circulation firing system according to claim 4, it is characterized in that, described flue gas draw arm (5), flue gas arm (6), wind mixed chamber (7) and be located at wind mixed chamber (7) and the combustion chamber of hotblast stove (12) between connecting tube refractory lining all is installed.
CN 201320097947 2013-03-04 2013-03-04 Flue gas self-circulation combustion system of blast furnace hot blast stove CN203174129U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103088178A (en) * 2013-03-04 2013-05-08 江苏沙钢集团有限公司 Blast furnace hot-blast stove flue gas self-circulation combustion method and system
CN104819459A (en) * 2015-04-30 2015-08-05 蒙阴远通达车辆机械有限公司 Gas heating furnace
CN109161628A (en) * 2018-09-30 2019-01-08 武汉奥杰科技股份有限公司 A kind of high-efficiency and energy-saving type blast furnace gas vertical hot furnace

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103088178A (en) * 2013-03-04 2013-05-08 江苏沙钢集团有限公司 Blast furnace hot-blast stove flue gas self-circulation combustion method and system
CN103088178B (en) * 2013-03-04 2014-09-10 江苏沙钢集团有限公司 Blast furnace hot-blast stove flue gas self-circulation combustion method and system
CN104819459A (en) * 2015-04-30 2015-08-05 蒙阴远通达车辆机械有限公司 Gas heating furnace
CN109161628A (en) * 2018-09-30 2019-01-08 武汉奥杰科技股份有限公司 A kind of high-efficiency and energy-saving type blast furnace gas vertical hot furnace

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Granted publication date: 20130904

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