CN2124378U - Oxygen-fuel burner for heating and smelting waste steel - Google Patents
Oxygen-fuel burner for heating and smelting waste steel Download PDFInfo
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- CN2124378U CN2124378U CN 91218331 CN91218331U CN2124378U CN 2124378 U CN2124378 U CN 2124378U CN 91218331 CN91218331 CN 91218331 CN 91218331 U CN91218331 U CN 91218331U CN 2124378 U CN2124378 U CN 2124378U
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Abstract
The utility model relates to a burner for heating and smelting waste steel, which is characterized in that the wall of a central fuel pipe is provided with a communicating hole pipe of an internal sleeve oxygen pipe, and a cyclone device of an external ring sleeve is arranged between a central pipe and an internal sleeve pipe. An external sleeve oxygen pipe adjusts the proportion among the premixed oxygen, the cyclone oxygen and the direct current ring current oxygen by adjusting the cross section ratio of the external sleeve oxygen pipe in order to control the mixing of oxygen and fuel and the rigidity of the flame. The proportion between the cyclone oxygen and the direct current ring current oxygen is adjusted to 2: 8 to 6: 4. The utility model has the advantages of simple structure, easy adjustment, easy ignition, complete combustion, high temperature and strong rigidity, and the utility model uses the fuel of bituminite, anthracite, coke, etc. The utility model is used for heating a flat furnace, an electric arc furnace, etc.
Description
The present invention is the burner that is used to heat with melting waste steel.
Electric arc furnaces is the modernization steel-making device based on steel scrap, adopts three electrode power supply heat fused steel scraps, belongs to the heat point source heat supply, causes the temperature field in furnace skewness, occurs the hot-zone and the cold-zone of heating in stove.Therefore, time melting stage is long, and power consumption accounts for more than 60% of full stove power consumption.Along with electric arc furnaces ultra high powerization and correlation technique thereof are used and development, especially provide auxiliary thermal source with the oxy-fuel combustion device to the electric arc furnaces cold-zone, the development of furnace outer refining technology, promote that the electric arc furnace smelting power consumption is reduced significantly, the development of electric arc furnaces presents its great vitality, it can produce steel alloy and special steel, also can produce ordinary steel.Electric arc furnaces self is converted into the equipment of melting waste steel gradually by the smelting equipment of special steel, reduce the melting stage indicator of power consumption, and shortening the heat more seems important.Wherein the oxy-fuel combustion device then has been one of important measures of saving energy of electric arc furnace.
Owing to adopt the electric arc furnaces correlation technique, since nineteen sixty, external power consumption is reduced to 400Kwh/t from 630Kwh/t, and the tapping-tapping time is reduced to 70min from 180min.Adopt the oxy-fuel combustion device to provide auxiliary heat, this regional scrap melting and other hot-zone scrap melting are reached synchronously, thereby shortened fusing time effectively and reduced power consumption to interelectrode cold-zone.Abroad, usual earlier adopts oxygen-oil or its power of oxygen-gas burner to be about 1/4-1/2 of furnace transformer power, energy-conservation is 10%, the 15-25% that boosts productivity, generally reducing power consumption is 40-70Kwh/t, the structure majority of its burner is the burner of bushing type or attached swirl vane, Japan and China all develop oxygen-powdered coal burner since the seventies, provide auxiliary thermal source to the electric arc furnaces cold-zone, its energy-saving and production-increase effect and oxygen-oil, the burner of oxygen-combustion gas is close.
Powdered coal burner important techniques key is the mixing and the igniting of oxygen and fine coal, most mixing of adopting swirl-flow devices or utilizing multiply circulation bushing type burner acceleration oxygen and fine coal, and mixability is decided by the size of recirculating zone.Because adopt swirl-flow devices then to influence the axial spread speed of flame, bushing type burner mixability is poor, thereby reduces its efficiency of heating surface.In order to improve the mixing of oxygen and fine coal, increase the axial spread speed and the rigidity of flame.Flame with high temperature and high speed, high rigidity heats and melting waste steel, further improves burn-off rate and heat utilization efficiency.
The present invention seeks to the shortcoming that the oxygen-powdered coal burner at existing bushing type or spiral-flow type exists, taking directly to mix in part oxygen and the fine coal carrier pipe is oxygen and fine coal mixed once, utilize the oxygen of oxygen eddy flow and the secondary of fine coal to mix, and fully the mixing and measure such as completing combustion of oxygen direct current annular jet and unburnt combustible, select the combine oxygen-powdered coal burner of structure of mixed in oxygen and the fine coal, eddy flow and dc loop-current oxygen jet.To reach the mixability that improves oxygen and fine coal, improve flame temperature, improve the combustion rate of fine coal, increase flame jet intensity, improve heat exchanger effectiveness, so that quicken steel scrap heating and burn-off rate, further reduce the electric arc furnace smelting power consumption, shorten the heat, boost productivity.
The structure of the oxygen-powdered coal burner of heating of the present invention and melting waste steel, burner general assembly drawing profilograph is seen accompanying drawing 1, and fine coal carrier pipe and oxygen swirl-flow devices profilograph are seen accompanying drawing 2, and the water cooler sectional side elevation of burner is seen accompanying drawing 3.Comprise center conveying fine coal pipe (1), the delivery of oxygen pipe is divided into inner sleeve (2), outer tube (3), the swirl-flow devices (4) of outer sleeve is installed on the fine coal pipe port of export outer wall of center in the shower nozzle, its swirl-flow devices is swirl vane, tangential vane, guiding gutter etc., be placed between central tube and the inner sleeve, outer tube is the oxygen DC tube, is eddy flow and direct current oxygen spray pipe in the shower nozzle.Its section ratio is selected according to the eddy flow and the direct current ratio of oxygen flow.Three layers of telescopic water-cooling apparatus (5) of protection oxygen-powdered coal burner, water inlet (6), delivery port (7), eddy flow oxygen intake (8), direct current oxygen intake (9), fine coal inlet (10).
Swirl-flow devices of the present invention is placed in the port of export of center fine coal pipe, see Fig. 2, swirl-flow devices (11), the outer sleeve of swirl-flow devices (12), it is that oxygen jet in the oxygen swirl flow nozzle in the inner sleeve is divided into rotating jet and dc loop-current, its section ratio is to be undertaken by the relative position of regulating center fine coal pipe swirl-flow devices and inner sleeve oxygen nozzle end, so that regulate the eddy flow amount of oxygen flow and the ratio of DC quantity, the adjusting ratio of its eddy flow and direct current oxygen amount is 2:8-6:4.Carry the fine coal tube wall to offer the intercommunicating pore pipe (13) that overlaps oxygen pipe and fine coal pipe in the connection at the center, its equivalent diameter is 0.001-0.010m, it distributes along the circumference and the axial distribution of carrying the fine coal tube wall, can be according to the pressure reduction between the carrier gas of oxygen pressure and conveying fine coal, so that determine to offer the area of intercommunicating pore pipe, select suitable equivalent diameter and perforate quantity determining the oxygen amount of input fine coal carrier pipe, the intercommunicating pore pipe is along carrying around the fine coal tube wall and axial distribution.
The present invention offers the intercommunicating pore pipe along fine coal carrier wall circumference, oxygen content is that 30-60% is a foundation to its perforated area in its carrier gas to control, and the spacing of the intercommunicating pore of axially offering is a 0.01-0.2 rice, according to perforated area, determine opening diameter and quantity, and determine its distribution.According to the content of fine coal fugitive constituent, select to determine to offer the axial aperture position of intercommunicating pore pipe, i.e. perforate is apart from the axial distance of the shower nozzle port of export.Its fine coal volatile matter is high more, and it is short more apart from the axial distance of the port of export then to offer intercommunicating pore, and the fine coal volatile matter is low more, and its axial distance is long more.
The present invention can regulate the conveying fine coal pipe of swirl-flow devices of outer sleeve and the oxygen inner sleeve position that axially relatively moves, so that change oxygen eddy flow, oxygen direct current and feed the ratio of oxygen flow in the fine coal carrier pipe, realizes that flame regulates.
Oxygen of the present invention-powdered coal burner rely on himself at a high speed Oxygen Flow or air to flow to promoting the circulation of qi cold, and, reasonably select the fine coal spouting velocity, the swirl strength of the Oxygen Flow of eddy flow, axial velocity, and the muzzle velocity of oxygen dc loop-current in the outer tube, be 0.03-0.3m to guarantee the flame root apart from the suitable distance of shower nozzle outlet, this is the oxygen-powdered coal burner that relies on self air cooling.The electric arc furnace wall is under the condition of water-cooled dross furnace wall, adopts the oxygen-powdered coal burner of self air cooling.If the electric arc furnace wall is a refractory material,, can adopt cooling jacket for protection refractory material furnace wall; its structure is three layers of sleeve pipe; see accompanying drawing 3, cooling jacket placed in the duct of burner of furnace wall that its outlet is designed to be contracted to earlier aditus laryngis; the outlet form (14) of the similar burner of further expansion; outer tube (15), middle sleeve (16), inner sleeve (17); outlet pipe (18), oral siphon (19).Oxygen-powdered coal burner is placed in the cooling jacket, and burner moves axially along water jacket and regulates its axial distance, to adjust the burner outlet position.Burner can be fixed or telescopic, and in the former smelting process, burner is fixed in the water jacket all the time, the latter, and according to smelting requirements, oxygen-powdered coal burner can advance or withdraw from.
The embodiment 1 of oxygen-powdered coal burner of the present invention, its structure is seen Fig. 4, the general assembly profilograph of burner, carry on the fine coal pipe (20) at the center, the swirl-flow devices (21) of outer sleeve is installed, oxygen outer tube (22), Oxygen Flow forms eddy flow by swirl-flow devices, utilize the axial location of mobile fine coal carrier pipe to change the ratio of the circumferential weld area between oxygen eddy flow discharge area and swirl-flow devices outer sleeve and oxygen internal surface of sleeve pipe, to adjust the ratio of its eddy flow oxygen amount and direct current oxygen amount.Can be adjusted to the ratio 1:4 of oxygen eddy flow amount and DC quantity by oxygen wheel stream, this structure can realize that flame regulates, and guarantees that the secondary of oxygen and fine coal mixes, and the direct current Oxygen Flow is finished the completing combustion of fuel and guaranteed flame rigidity.This burner is used for about 27 tons-30 tons electric arc furnaces of charge weight, transformer efficiency 7000-9000KVA, oxygen-powdered coal burner general power 2400-4000KW, three oxygen-powdered coal burners place on the furnace wall, to the heat supply of electric arc furnaces cold-zone, its melting stage power consumption reduction 50-100Kwh/t, time melting stage shortens 20-30min, and productivity ratio improves 8%.
The embodiment of the invention 2, its structure is seen accompanying drawing 1, oxygen-powdered coal burner comprises fine coal carrier pipe, oxygen inner sleeve and outer tube, the fine coal carrier pipe is set up the swirl-flow devices of outer sleeve, and offer the intercommunicating pore diameter 0.002-0.003 rice of carrying the fine coal tube wall, number of aperture is 20-40, and its perforated area is the 40-100% of carrier pipe outlet, and oxygen content is 30-60% in the carrier gas of raising conveying fine coal.Utilization moves axially carries the fine coal pipe to regulate eddy flow oxygen amount and direct current oxygen amount 5:1 by interior cover oxygen pipe, simultaneously, utilizes eddy flow oxygen and direct current oxygen valve, regulates the ratio of eddy flow oxygen amount and outer tube direct current oxygen amount, and its total adjusting is than being 2:8-6:4.Oxygen-powdered coal burner of the present invention is used for the electric arc furnaces of 38 tons of charge weights, transformer efficiency 9000-12000KVA, the oxy coal burner general power is 2600-5000KW, adopt this oxygen-powdered coal burner to flux, its time melting stage shortens 30min, power consumption reduces 80-100Kwh/t, and its full stove power consumption reaches the good index of 450Kwh/t, and productivity ratio can improve 10-15%.
Oxygen-powdered coal burner of the present invention is simple in structure, by regulating eddy flow and direct current oxygen outlet cross section or flow control valve, realize that eddy flow oxygen flow and direct current oxygen flow ratio are the perforated areas by fine coal carrier wall intercommunicating pore, oxygen and carrier gas pressure reduction are regulated the oxygen content of carrier gas.Like this, oxygen and fine coal are evenly mixed, help igniting and smooth combustion rapidly, utilize direct current oxygen jet to finish completing combustion, and enhancing flame transmission speed and jet intensity, strengthen flame rigidity, improve convection current, radiant heat transfer efficient, improve the combustion rate of fuel, quicken steel scrap heating and fusion process, further shorten fusing time, reduce power consumption.
The present invention need not outer thermal source, utilize the residual heat high-temperature in the electric arc furnaces can realize normal ignition, light a fire behind the fettling and before the charging, also can after charging, light a fire smoothly, in case of necessity, utilize starting the arc igniting, oxygen and anthracite are 3-5 minute normal ignitions after energising, anthracite and bituminous coal mixture are the 1-3 minute normal ignitions in energising back, and bituminous coal and coke mixture then are 3-8 minute normal ignitions after the energising, realize normal ignition immediately after oxygen and bituminous coal are then feeded.
The present invention can be under electric arc furnaces normal power supply condition, introduce oxygen-powdered coal burner simultaneously and provide heat heating and melting waste steel, suitably adjust the technological parameter of oxygen-pulverized coal friring, can obtain the effect of fluxing preferably to the cold-zone, shorten the heat, reduce power consumption.Under cold situation, normal ignition utilizes heating of oxygen coal combustion heat and melting waste steel, and pulverized coal injection and the oxygen time of fluxing were controlled at 45-60 minute, and energising utilizes the electric arc heated steel scrap again, can reduce power consumption, up 100-150Kwh/t significantly.The present invention utilizes the heat supply of oxygen powdered coal burner, is generally 40-90 minute, and fusing time is 70-120 minute, and power consumption reduces 50-120Kwh/t.
The technological parameter of oxygen-powdered coal burner of the present invention, coal supply amount are 0.15-0.5 kilogram/ton. divide, oxygen-supplying amount is a 0.2-1.5 mark rice
3/ ton. divide its best coal supply amount 0.15-0.35 kilogram/ton.Divide, best oxygen supply parameter is 3/ ton in a 0.3-1.2 mark rice. divide.The ratio 2-3.5 of carbon content in oxygen supply of the present invention and the fine coal can adjust the ratio of its oxygen and charcoal according to the process of fusing.
It is bituminous coal that the present invention uses fuel, anthracite, and fine powders such as coke, and composition thereof, also can use gas and liquid fuel etc.Can be used for the charging stock for electric furnace preheating, melting stage the technology of fluxing, also can be used for the complete coal-fired energy saver of open hearth heating or melting waste steel or EOF, oxygen-powdered coal burner can place the electric arc furnace wall to place the interior cold-zone of electric arc furnaces, or place electric arc furnaces bell top, simultaneously, can place stove gate.
Oxygen-powdered coal burner of the present invention is simple in structure, is convenient to regulate, and easy operating, small investment is the important conservation measures of electric arc furnaces, can reduce power consumption significantly, shortens melting stage, boosts productivity and reduces cost, its pay back period is generally 1-1.5.
Claims (4)
1, oxygen-the powdered coal burner of a kind of heating and melting waste steel, comprise and carry the fine coal pipe, the delivery of oxygen pipe, oxygen spray pipe is set up swirl-flow devices in the shower nozzle, it is characterized in that the delivery of oxygen pipe comprises inner sleeve and outer tube, the swirl vane of outer sleeve is installed between the inner sleeve of shower nozzle and the conveying fine coal central tube, tangential vane or guiding gutter, the intercommunicating pore pipe of cover oxygen pipe and fine coal pipe in the fine coal carrier wall is offered and is communicated with, its equivalent diameter is 0.001-0.010m, it distributes along the circumference and the axial distribution of carrying the fine coal tube wall, outer tube is the delivering oxygen DC tube, burner tip comprises oxygen eddy flow and direct current jet pipe, and its section ratio is selected according to the eddy flow and the direct current ratio of oxygen flow, and its eddy flow and DC adjustment ratio are 2: 8-6: 4.
2, according to the described oxygen-powdered coal burner of claim 1, it is characterized in that offering intercommunicating pore along fine coal carrier wall circumference, the intercommunicating pore perforated area is 30-60% to control its carrier gas oxygen content, the spacing of the intercommunicating pore of axially offering is a 0.01-0.2 rice, according to the volatile matter content chosen axis of fine coal to position of opening, apart from the axial distance of shower nozzle outlet.
3, according to the described oxygen-powdered coal burner of claim 1, it is characterized in that protecting the cooling jacket of fire proof material of furnace lining, be fixed in the burner putting hole of body of heater, burner relies on self air cooling or places in the cooling jacket.
4, according to the described oxygen-powdered coal burner of claim 1, it is characterized in that comprising the fine coal carrier pipe, oxygen inner sleeve and outer tube, the fine coal carrier pipe is set up the swirl-flow devices of outer sleeve, and offer the intercommunicating pore diameter 0.002-0.003 rice of carrying the fine coal tube wall, number of aperture 20-40, its perforated area is the 40-100% of carrier pipe outlet, utilizes to move axially and carries the fine coal pipe to regulate eddy flow oxygen amount and direct current oxygen amount by interior cover oxygen pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91218331 CN2124378U (en) | 1991-07-22 | 1991-07-22 | Oxygen-fuel burner for heating and smelting waste steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91218331 CN2124378U (en) | 1991-07-22 | 1991-07-22 | Oxygen-fuel burner for heating and smelting waste steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2124378U true CN2124378U (en) | 1992-12-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91218331 Granted CN2124378U (en) | 1991-07-22 | 1991-07-22 | Oxygen-fuel burner for heating and smelting waste steel |
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| Country | Link |
|---|---|
| CN (1) | CN2124378U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102597629A (en) * | 2009-10-30 | 2012-07-18 | 乔治洛德方法研究和开发液化空气有限公司 | Method of combusting particulate solid fuel with a burner |
| CN108180477A (en) * | 2018-02-24 | 2018-06-19 | 陈绪忠 | Bispin multistage purification step-less adjustment burner and heating furnace |
| CN108728168A (en) * | 2017-04-14 | 2018-11-02 | 航天长征化学工程股份有限公司 | Gasification burner |
-
1991
- 1991-07-22 CN CN 91218331 patent/CN2124378U/en active Granted
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102597629A (en) * | 2009-10-30 | 2012-07-18 | 乔治洛德方法研究和开发液化空气有限公司 | Method of combusting particulate solid fuel with a burner |
| CN102597629B (en) * | 2009-10-30 | 2014-09-24 | 乔治洛德方法研究和开发液化空气有限公司 | Method of combusting particulate solid fuel with a burner |
| CN108728168A (en) * | 2017-04-14 | 2018-11-02 | 航天长征化学工程股份有限公司 | Gasification burner |
| CN108180477A (en) * | 2018-02-24 | 2018-06-19 | 陈绪忠 | Bispin multistage purification step-less adjustment burner and heating furnace |
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