CN105403040B - Flue gas recirculation auxiliary combustion formula aluminium melting furnace - Google Patents
Flue gas recirculation auxiliary combustion formula aluminium melting furnace Download PDFInfo
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- CN105403040B CN105403040B CN201510810516.7A CN201510810516A CN105403040B CN 105403040 B CN105403040 B CN 105403040B CN 201510810516 A CN201510810516 A CN 201510810516A CN 105403040 B CN105403040 B CN 105403040B
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Abstract
The present invention discloses a kind of flue gas recirculation auxiliary combustion formula aluminium melting furnace, include: aluminum melting furnace body, aluminum melting furnace body include set on internal burner hearth, the combustion chamber positioned at burner hearth middle and upper part, the molten aluminum pond positioned at lower furnace portion and set on aluminum melting furnace body side wall and with the high-temperature flue gas outlet of combustion chamber；At least one main burning rifle, at least one main burning rifle be set to aluminum melting furnace body an end wall be used for into combustion chamber combustion of fuel injected heat release the aluminium in molten aluminum pond is fused into molten aluminum；And high-temperature flue gas outlet is connected to chimney by flue, flue.Wherein, flue gas recirculation auxiliary combustion formula aluminium melting furnace further comprises: auxiliary combustion rifle, and auxiliary combustion rifle is set to an end wall of aluminum melting furnace body at least one main burning rifle compartment of terrain；And smoke backflow pipeline, smoke backflow pipeline are connected to so that the part high temperature gases recirculating in flue is combustion-supporting to auxiliary combustion rifle with flue.
Description
Technical field
The present invention relates to a kind of furnace equipment, in particular to a kind of aluminium melting furnace.
Background technique
Aluminium melting furnace is a kind of common furnace equipment, and ignition temperature is high, and fuel consumption is big.The flue gas of general aluminium melting furnace
The flue-gas temperature in exit would generally reach 1000-1100 degrees centigrade, if the flue gas of such high temperature is directly discharged to ring
In border, huge energy waste not only will cause, while can cause environmental pollution destruction.
Therefore, those skilled in the art have been devoted to renovating for aluminium melting furnace, it is expected that further increasing the benefit of fuel
With efficiency, and the high-temperature flue gas of discharge is rationally utilized, to reduce the waste of high-temperature flue gas waste heat.For example, by high temperature cigarette
Gas is introduced into air heat exchanger, is preheated to that will enter the combustion-supporting air of aluminium melting furnace, to obtain more preferably combustion efficiency.
However, existing reducing energy consumption measure is still limited, to the mode of high-temperature flue gas UTILIZATION OF VESIDUAL HEAT IN, there is also limitations, therefore a large amount of
High-temperature fuel gas heat be not used appropriately still, in addition, the heating method of aluminium is single in existing aluminium melting furnace, heating efficiency
Low, uneven heating, the utilization rate for also resulting in fuel is low.
A kind of circular environmental protection energy-saving aluminium melting furnace as disclosed in Chinese Patent No. 200410041667.2, including furnace body, combustion
Burner component, heat exchanger, dust-extraction unit and connecting line, valve, furnace body include that cylindrical type furnace wall, baking type furnace roof, furnace bottom, aluminium are solid
Body feed opening, molten aluminum outlet and high-temperature flue gas outlet, burner assembly are connected on furnace wall, and molten aluminum outlet is set under furnace wall
Side, high-temperature flue gas outlet are set on aluminium solid feed inlet side wall, are connected with heat exchanger, heat exchanger is connected with dust-extraction unit
Logical, aluminium solid feed inlet is set among baking type furnace roof, and the flue gas being discharged from aluminium melting furnace is empty to carry out burning for heating air
The preheating of gas.
A kind of for another example Double-side Heating aluminum melting furnace system disclosed in Chinese patent application 201220357580.6, including furnace
The interior wall of body, flue and control device, furnace body is made of refractory fireclay block, and the exterior wall of furnace body is made of light fire brick, furnace body
Side is equipped with fire door, and the top of combustion chamber is to encircle furnace roof partially, and combustion chamber, aluminum melting pond and several burners, burning are equipped in furnace body
Room and aluminum melting pond are setting up and down, and the top of combustion chamber is to encircle furnace roof partially, are made of refractory fireclay block, the nozzle level of burner is set
It sets and face encircles the inside arc wall of furnace roof partially, flue is located at the lower section in aluminum melting pond and communicates with combustion chamber, and flue is arranged in aluminum melting
The bottom in aluminum melting pond is directly heated in the lower section in pond using the high-temperature flue gas in flue as heat source, cooperates inclined arcuately furnace roof,
High-speed rotating flame is formed in furnace, realizes the double-faced uniform heating of material in aluminum melting pond.
For another example a kind of chimney flue type disclosed in Chinese patent application 201020153616.X utilizes waste gas residual heat conversion thermal energy
Aluminium melting furnace combustion apparatus, including combustion chamber, the side of combustion chamber is equipped with fire door, burning machine gun, combustion is equipped with before combustion chamber
It burns room and is equipped with one or two vertical or horizontal flue gas leading, flue gas leading is a chimney flue type flue gas heat-exchange device, flue gas leading
Upper end is equipped with air leading-in conduit, and the lower end of flue gas leading is equipped with preheated air delivery line, preheated air delivery line and combustor
It is connected in rifle, is preheated using the waste heat of discharge flue gas to the combustion-supporting air of aluminium melting furnace will be entered.
Technology disclosed in above-mentioned three patent/patent applications utilizes the high-temperature flue gas being discharged in aluminium melting furnace,
Perhaps combustion air is heated in a heat exchanger using fume afterheat or using fume afterheat as to aluminium melting furnace calory burning
Supplement, however there are still disadvantage or deficiencies for above-mentioned technology, such as: (1), to the Land use systems of the fume afterheat of aluminium melting furnace discharge
It is single, it is used only for the heating of aluminium melting furnace itself or preheated air, the utilization efficiency of flue gas heat is low, not up to optimal heat
Utilizing status is measured, power loss is big；(2), with only the waste heat of discharge flue gas, and benefit of not burnt again to flue gas
With being emitted into the flue gas of environment there is also a large amount of combustible and harmful components, wherein the energy of combustible is
To making full use of, and harmful components are directly entered atmosphere and also impact to environment, are unfavorable for energy-saving and emission-reduction；(3), not to aluminum melting
Aluminium material in furnace carries out agitation and preheating appropriate, and the heating of aluminium material is slow and uneven heating is even, and partial region heating is insufficient, influences
Aluminium material is converted to the speed of molten aluminum and the mobility of generated molten aluminum, and the thermal efficiency is low, and job schedule is slow；(4), aluminium melting furnace
The equipment of not set auxiliary flue gas emission, the furnace pressure in aluminium melting furnace is big, and job insecurity, there are some potential safety problemss.
Therefore it provides a kind of conversion that is rapidly heated that can make full use of fume afterheat, realize high-temperature flue gas auxiliary aluminum material
And combustion-supporting aluminium melting furnace becomes urgent problem in the industry again using fume afterheat.
Summary of the invention
The object of the present invention is to provide one kind can accelerate aluminium burn-off rate, avoids furnace pressure from increasing, the aluminum melting of energy-saving and emission-reduction
Furnace.
According to the solution of the present invention, a kind of flue gas recirculation auxiliary combustion formula aluminium melting furnace is provided, comprising: aluminum melting furnace body,
Aluminum melting furnace body include set on internal burner hearth, the combustion chamber positioned at burner hearth middle and upper part, the molten aluminum pond positioned at lower furnace portion and
Set on aluminum melting furnace body side wall and with the high-temperature flue gas outlet of combustion chamber；At least one main burning rifle, at least one main combustion
Burn rifle be set to aluminum melting furnace body an end wall for into combustion chamber combustion of fuel injected heat release with by molten aluminum pond aluminium melt
At molten aluminum；And high-temperature flue gas outlet is connected to chimney by flue, flue.Wherein, flue gas recirculation auxiliary combustion
Formula aluminium melting furnace further comprises: auxiliary combustion rifle, and auxiliary combustion rifle and at least one main burning rifle compartment of terrain are set to aluminium melting furnace sheet
One end wall of body；And smoke backflow pipeline, smoke backflow pipeline are connected to so that the part in flue is high with flue
Warm smoke backflow is combustion-supporting to auxiliary combustion rifle.
It preferably, further comprise air compressor and ejector pipe, the compressed air outlet and ejector pipe of air compressor
One end be connected, the other end of ejector pipe is extended in smoke backflow pipeline and is open towards auxiliary combustion rifle (that is, compression is empty
The injection direction of gas is along the flow of flue gas direction from flue to auxiliary combustion rifle) so that the part in flue is high
Warm flue gas is back to auxiliary combustion rifle under the suction function that the compressed air sprayed into smoke backflow pipeline is formed.Compressed air
It is flowed in smoke backflow pipeline towards the direction of auxiliary combustion rifle, so that being connected with air compression in smoke backflow pipeline
The upstream of the position of machine forms negative pressure, thus by high-temperature flue gas in from flue injection to smoke backflow pipeline.
Selectively, ejector pipe can be configured to substantially L-shaped, alternatively, the other end of ejector pipe with certain tilt angle with
The connection of smoke backflow pipeline, and compressed air is sprayed towards the direction of auxiliary combustion rifle.
Preferably, further comprise stirring fluxing flue, stir one end of fluxing flue in ejector pipe and auxiliary
It helps between combustion gun and is connected to smoke backflow pipeline, stirred on the other end of fluxing flue and the bottom wall of aluminum melting furnace body
The connection of at least one air inlet, the part sky cigarette gaseous mixture in smoke backflow pipeline is sprayed into molten aluminum pond to stir molten aluminum.
It is highly preferred that further comprising supercharger, supercharger setting is in stirring fluxing flue to mix empty cigarette
The pressure of gas increases to 0.4~1.0MPa, such as 0.5MPa, and the cigarette gaseous mixture that makes to have leisure overcomes the pressure in burner hearth to spray into molten aluminum pond
It is interior to stir molten aluminum.
Selectively, it is set in the unit time by the flue gas that flue enters smoke backflow pipeline with percent by volume
It is calculated as 20~40% of amount of flue gas emission in flue, such as 30% or so.
Selectively, entered in the unit time by smoke backflow pipeline and stir the flue gas of fluxing flue and be set to body
Product percentages are 10~20% of amount of flue gas emission in smoke backflow pipeline, such as 15% or so.
Specifically, at least five air inlets can be equipped at intervals on the bottom wall of aluminum melting furnace body, stir fluxing flue
The other end can be equipped at least five flue gases and stir branch pipe, one end of each flue gas agitation branch pipe respectively with stir fluxing flue gas
Connection inside pipeline, the other end of each flue gas agitation branch pipe respectively with corresponding each air inlet on aluminum melting furnace body bottom wall
Connection.
Selectively, at least five air inlets can be linearly or circular at equal intervals set on bottom wall, or in rectangular
Interval is set to bottom wall, then stirring the other end of fluxing flue, to may be configured to correspondingly-shaped matching.
It selectively, further comprise mixer, mixer includes that fuel gas inlet, air intake and air-fuel mixture go out
Mouthful, air-fuel mixture outlet is connected to at least one main burning rifle by pipeline by the combustion gas from fuel gas inlet and from sky
At least one main burning gun burner is delivered to after the air mixing of gas entrance.
Selectively, further on the tube wall of smoke backflow pipeline neighbouring auxiliary combustion rifle setting assisted gas entrance with
By fuel gas transmission to auxiliary combustion gun burner.
Selectively, flue gas recirculation auxiliary combustion formula aluminium melting furnace includes two main burning rifles, in the height of aluminum melting furnace body
It spends on direction, auxiliary combustion rifle position is above two main burning rifles；In the transverse direction of aluminum melting furnace body, auxiliary combustion rifle position
In the centre of two main burning rifles.
Selectively, along the longitudinal direction of aluminum melting furnace body, at least one main burning rifle and auxiliary combustion rifle are opposite
It is tilted down in horizontal plane.
Wherein, supercharger can be air pressure or booster fan etc..
Wherein, combustion gas can be coal gas, natural gas or liquefied petroleum gas etc..
Selectively, at least one level heat-exchange system can be set in flue, such as: steam generator can be set,
It is used for turbogenerator power generation after preparing steam using fume afterheat, air preheater then is set in steam generator downstream,
Using after fume afterheat heating cold air be used for main burner and/or auxiliary combustion rifle it is combustion-supporting.
The beneficial effects of the present invention are: (1), according to the present invention, part high-temperature flue gas sucks cigarette by ejector action negative pressure
Gas reflux line, this can remove furnace pressure, so that furnace pressure be avoided to increase bring security risk；(2), auxiliary combustion rifle is coming from
The combustion-supporting lower high combustion efficiency of high-temperature flue gas in smoke backflow pipeline, main burning rifle and one combust of auxiliary combustion rifle are conducive to
Accelerate aluminium burn-off rate；(3), the high-temperature flue gas of a part pressurization is sprayed into molten aluminum pond by stirring fluxing flue by bottom
To reinforce the agitation of molten aluminum, so that burn-off rate is accelerated, it is more energy saving；(4), using high-temperature flue gas auxiliary combustion, reduce
Harmful components therein are greatly reduced in the direct emission amount of flue gas, reduce the pollution level to environment.
Detailed description of the invention
Fig. 1 shows the schematic front view of flue gas recirculation auxiliary combustion formula aluminium melting furnace of the invention.
Fig. 2 shows the schematic top plan views of flue gas recirculation auxiliary combustion formula aluminium melting furnace of the invention.
Specific embodiment
Please refer to Fig. 1 and Fig. 2, a kind of embodiment according to the present invention, flue gas recirculation auxiliary combustion formula aluminium melting furnace packet
It includes: aluminum melting furnace body 100,200, two main burning rifles 300 of mixer, auxiliary combustion rifle 400, air compressor 600 and increasing
Press 700.
Aluminum melting furnace body 100 includes set on internal burner hearth (not labeled), combustion chamber 110, position positioned at burner hearth middle and upper part
In the molten aluminum pond 120 of lower furnace portion and set on aluminum melting furnace body side wall and the high-temperature flue gas outlet that is connected to combustion chamber 110
112.High-temperature flue gas outlet 112 is connected to chimney (not shown) by flue 810.Although in the non-limiting embodiment
In be not directed to, it will be appreciated by a person skilled in the art that in flue 810 it is settable one or more waste heat utilization equipments
To recycle the waste heat of about 1000 degrees Celsius of high-temperature flue gas.
The end wall 150 that two main burning rifles 300 and auxiliary combustion rifle 400 are set to aluminum melting furnace body 100 is used for burning
Combustion of fuel injected heat release is in room 110 to be fused into molten aluminum for the aluminium in molten aluminum pond 120.In the height side of aluminum melting furnace body 100
Upwards, auxiliary combustion rifle 400 is located at two main burning rifles, 300 top.It is (in Fig. 1 vertical in the transverse direction of aluminum melting furnace body 100
In the direction of paper) on, auxiliary combustion rifle 400 is located at the centre of two main burning rifles 300.Along the vertical of aluminum melting furnace body 100
To direction, main burning rifle 300 and auxiliary combustion rifle 400 are tilted down both with respect to horizontal plane, by flame towards molten aluminum pond 120
Injection.
Mixer 200 includes the fuel gas inlet 210 set on an end wall, the air intake 220 set on side wall and is set to another
One end wall air-fuel mixture outlet 230, air-fuel mixture outlet 230 by pipeline be connected to each main burning rifle 300 with incite somebody to action
Natural gas from fuel gas inlet is delivered to each main burning rifle 300 and burns after mixing with the air from air intake.
Neighbouring high-temperature flue gas outlet 112 is equipped with backflow flue gas mouth 812 on the tube wall of flue 810.Backflow flue gas mouth
812 are connected to by smoke backflow pipeline 820 with auxiliary combustion rifle 400, by the part high temperature gases recirculating in flue 810
It is combustion-supporting to auxiliary combustion rifle 400.Neighbouring auxiliary combustion rifle 400 is equipped with assisted gas entrance on the tube wall of smoke backflow pipeline 820
825 to burn natural gas transportation to auxiliary combustion rifle 400.
The compressed air outlet of air compressor 600 is connected with one end of substantially L-shaped ejector pipe 610, ejector pipe 610
The other end extend in smoke backflow pipeline 820 and be open 615 towards the direction of auxiliary combustion rifle 400 (that is, compressed air
Injection direction along the flow of flue gas direction from flue to auxiliary combustion rifle), so that about 30% in flue 810
High-temperature flue gas injection under the suction function that the compressed air sprayed into smoke backflow pipeline 820 is formed enters smoke backflow pipeline
820, and then it is combustion-supporting to be back to auxiliary combustion rifle 400.
In addition, further including stirring fluxing flue 850, one end of fluxing flue 850 is stirred in 610 He of ejector pipe
It is connected between auxiliary combustion rifle 400 with smoke backflow pipeline 820, stirs the other end and aluminium melting furnace sheet of fluxing flue 850
Spaced five air inlets 166 connection on the bottom wall 160 of body 100, by smoke backflow pipeline 820 about 10% empty cigarette
Gaseous mixture sprays into molten aluminum pond 120 to stir molten aluminum.Wherein, the other end for stirring fluxing flue 850 is set there are five flue gas
Branch pipe 855 is stirred, one end of each flue gas agitation branch pipe 855 is connected to inside the fluxing flue 850 of agitation respectively, Mei Geyan
The other end each connection of air inlet 166 corresponding on 100 bottom wall 160 of aluminum melting furnace body respectively of branch pipe 855 is moved in gas mixing.
Supercharger (booster fan) 700 is arranged in the fluxing flue 850 of agitation to increase the pressure of empty cigarette gaseous mixture
Greatly to about 0.5MPa, the cigarette gaseous mixture that enables to have leisure overcomes the pressure of pressure and molten aluminum in burner hearth to spray into molten aluminum pond to stir
Molten aluminum accelerates fusing.
As a kind of alternative embodiments, other aspects are identical as aforementioned embodiments, the difference is that: it does not use
Fluxing flue 850 and supercharger 700 are stirred, but the air preheater (not shown) by being arranged in flue 810 is pre-
Spaced several air inlets 166 spray into molten aluminum pond on the bottom wall 160 that the high pressure-temperature air of heat passes through aluminum melting furnace body 100
It is interior to accelerate fusing to stir molten aluminum.
Although detailed description of the present invention preferred embodiment herein, it is to be understood that the invention is not limited to this
In the specific structure being described in detail and show, without departing from the spirit and scope of the present invention can be by the technology of this field
Personnel realize other modifications and variant.For example, mixer can be not provided with, and directly combustion gas and combustion air are provided to respectively
Main burning gun burner, meanwhile, assisted gas directly can also be provided to auxiliary combustion gun burner.In addition, temperature in the present invention,
The parameters such as pressure, volume can suitably be chosen within the scope of the present disclosure according to concrete application conditions.
Claims (6)
1. a kind of flue gas recirculation auxiliary combustion formula aluminium melting furnace, comprising:
Aluminum melting furnace body, the aluminum melting furnace body include set on internal burner hearth, positioned at combustion chamber, the position of the burner hearth middle and upper part
In the molten aluminum pond of the lower furnace portion and high-temperature flue gas set on the aluminum melting furnace body side wall and with the combustion chamber
Outlet；
At least one main burning rifle, the end wall that at least one described main burning rifle is set to the aluminum melting furnace body are used for described
Combustion of fuel injected heat release is in combustion chamber to be fused into molten aluminum for the aluminium in the molten aluminum pond；And
The high-temperature flue gas outlet is connected to chimney by flue, the flue；
It is characterized in that, the flue gas recirculation auxiliary combustion formula aluminium melting furnace further comprises:
Auxiliary combustion rifle, the auxiliary combustion rifle and at least one described main burning rifle compartment of terrain are set to the aluminum melting furnace body
One end wall；
Smoke backflow pipeline, the smoke backflow pipeline are connected to so that the part in the flue is high with the flue
Warm smoke backflow is combustion-supporting to the auxiliary combustion rifle；
Air compressor and ejector pipe, the compressed air outlet of the air compressor are connected with one end of the ejector pipe, institute
The other end for stating ejector pipe is extended in the smoke backflow pipeline and is open towards the auxiliary combustion rifle, so that the cigarette
Part high-temperature flue gas in feed channel flows back under the suction function that the compressed air sprayed into the smoke backflow pipeline is formed
To the auxiliary combustion rifle；
Stir fluxing flue, one end of the fluxing flue of agitation the ejector pipe and the auxiliary combustion rifle it
Between be connected to the smoke backflow pipeline, on the other end of the fluxing flue of the agitation and the bottom wall of the aluminum melting furnace body
The connection of at least one air inlet, by the part sky cigarette gaseous mixture in the smoke backflow pipeline spray into the molten aluminum pond with
Stir molten aluminum；And supercharger, the supercharger are arranged in the fluxing flue of the agitation with by the pressure of empty cigarette gaseous mixture
Power increases to 0.4~1.0MPa, and the cigarette gaseous mixture that makes to have leisure overcomes the pressure in the burner hearth to spray into the molten aluminum pond to stir
Molten aluminum；
Wherein, the flue gas recirculation auxiliary combustion formula aluminium melting furnace includes two main burning rifles, in the height of the aluminum melting furnace body
It spends on direction, the auxiliary combustion rifle position is above two main burning rifles；In the transverse direction of the aluminum melting furnace body,
The auxiliary combustion rifle position is in the centre of two main burning rifles.
2. flue gas recirculation auxiliary combustion formula aluminium melting furnace as described in claim 1, which is characterized in that wherein, in the unit time
It is set to be calculated as in the flue with percent by volume by the flue gas that the flue enters the smoke backflow pipeline
The 20~40% of amount of flue gas emission.
3. flue gas recirculation auxiliary combustion formula aluminium melting furnace as claimed in claim 2, which is characterized in that wherein, in the unit time
It is set to be calculated as the cigarette with percent by volume by the flue gas that the smoke backflow pipeline enters the fluxing flue of agitation
The 10~20% of amount of flue gas emission in gas reflux line.
4. flue gas recirculation auxiliary combustion formula aluminium melting furnace as claimed in claim 3, which is characterized in that the aluminum melting furnace body
At least five air inlets are equipped at intervals on bottom wall, the other end of the fluxing flue of agitation is equipped at least five flue gases
Branch pipe is stirred, one end of each flue gas agitation branch pipe is connected to inside the fluxing flue of agitation respectively, Mei Gesuo
State the other end each air inlet connection corresponding on the aluminum melting furnace body bottom wall respectively of flue gas agitation branch pipe.
5. flue gas recirculation auxiliary combustion formula aluminium melting furnace as described in any one of claims 1 to 4, which is characterized in that into one
Step includes mixer, and the mixer includes fuel gas inlet, air intake and air-fuel mixture outlet, the air-fuel mixture
Outlet is connected to at least one described main burning rifle by pipeline by the combustion gas from the fuel gas inlet and from the sky
At least one described main burning gun burner is delivered to after the air mixing of gas entrance.
6. flue gas recirculation auxiliary combustion formula aluminium melting furnace as described in any one of claims 1 to 4, which is characterized in that into one
Step on the tube wall of the smoke backflow pipeline neighbouring auxiliary combustion rifle setting assisted gas entrance with by fuel gas transmission extremely
The auxiliary combustion gun burner.
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| CN201510810516.7A CN105403040B (en) | 2015-11-19 | 2015-11-19 | Flue gas recirculation auxiliary combustion formula aluminium melting furnace |
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| CN201510810516.7A CN105403040B (en) | 2015-11-19 | 2015-11-19 | Flue gas recirculation auxiliary combustion formula aluminium melting furnace |
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| CN105403040B true CN105403040B (en) | 2019-04-05 |
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| CN106679438B (en) * | 2017-01-13 | 2023-03-31 | 成都易态科技有限公司 | Lime kiln high-temperature waste gas recycling system |
| CN108317854A (en) * | 2018-04-09 | 2018-07-24 | 常州市亿和铝合金焊材有限公司 | A kind of environment-protecting type horizontal holding furnace |
| CN110579116A (en) * | 2019-10-28 | 2019-12-17 | 张家港宏昌钢板有限公司 | Reduction of NOxDischarged single heat accumulating type heating furnace system |
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| CN201876115U (en) * | 2010-11-02 | 2011-06-22 | 界首市枫慧金属有限公司 | Smelting furnace |
| CN103105061A (en) * | 2011-11-10 | 2013-05-15 | 陈新华 | Heat storage type aluminum smelting furnace |
| CN203772003U (en) * | 2014-04-02 | 2014-08-13 | 长沙有色冶金设计研究院有限公司 | Strengthened smelting furnace |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB511573A (en) * | 1938-02-18 | 1939-08-21 | Isaiah Hall | Improvements in muffle or crucible furnaces |
| CN101063525A (en) * | 2007-04-03 | 2007-10-31 | 北京科技大学 | Oxygen-enriched combustion radiant tube heaters |
| CN201159471Y (en) * | 2008-01-30 | 2008-12-03 | 上海开能新技术工程有限公司 | High temperature flue gas ejector |
| CN201876115U (en) * | 2010-11-02 | 2011-06-22 | 界首市枫慧金属有限公司 | Smelting furnace |
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