CN110173994A - A kind of porous radiation Blackbody element of cavity - Google Patents
A kind of porous radiation Blackbody element of cavity Download PDFInfo
- Publication number
- CN110173994A CN110173994A CN201910472374.6A CN201910472374A CN110173994A CN 110173994 A CN110173994 A CN 110173994A CN 201910472374 A CN201910472374 A CN 201910472374A CN 110173994 A CN110173994 A CN 110173994A
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- Prior art keywords
- blackbody element
- furnace wall
- furnace
- cavity
- hole
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Classifications
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- 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
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/04—Casings; Linings; Walls; Roofs characterised by the form, e.g. shape of the bricks or blocks used
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Radiation Pyrometers (AREA)
Abstract
The present invention discloses a kind of porous radiation Blackbody element of cavity, is installed on furnace wall, generally cylindrical body, inner hollow, and wherein one end is installation end, is fixed on furnace wall, and the other end is equipped with end cap towards material, in one end towards material, and end cap is equipped with through-hole；Through-hole is circle, and quantity is 7~10, and axle center arranges 1, other are distributed on concentric circle；The gross area of through-hole accounts for the 20~28% of Blackbody element base area.The present invention can improve the blackness of Blackbody element to the greatest extent, increase the contact area of furnace gas and furnace wall, the effective utilization rate for improving stove thermal energy, and cost is relatively low, structure is simple, is easy to produce in batches manufacture, have no need to change original furnace kiln structure, it can be widely applied on various heating furnaces, and not aging substantially, safety is higher in engineer application.
Description
Technical field
The present invention relates to a kind of industrial furnace heat transfer element, specially a kind of porous radiation Blackbody element of cavity.
Background technique
There are two ways to improving thermal efficiency of heating furnace: first is that strengthening furnace heat transfer, second is that reinforcing waste heat recycling.Due to adding
When hot stove works, typical temperature is higher, in furnace based on radiant heat transfer, accounts for 90% or more total heat transfer.And radiant heat flux is temperature
The biquadratic function of degree.Average radiation temperature and pressure are slightly improved, heat output can be effectively improved.It is changed relative to major part by convection current
The heat recovery technology of heat, strengthening furnace heat transfer has very big advantage.
In the prior art, in order to strengthen furnace heat transfer, actual industrial furnace takes multinomial power-saving technology.Such as:
It takes light-duty furnace building material to reduce radiation loss, improves furnace wall blackness using high-temperature coatings, changing furnace wall structure (reduces furnace wall
Highly, add burner hearth internal partition wall) etc. modes strengthen furnace heat transfer.Although the heat of furnace wall theoretically can be improved in these measures
Efficiency, but its energy-saving effect is limited in practical applications.
There are also some industrial furnaces to use black matrix technology.Black matrix technology is the black matrix theory according to Infrared Physics, to " absolutely
The concept of black matrix " is subject to technicalization, has developed a kind of industrial standard blackbody, it is referred to as Blackbody element, by numerous black matrix members
Part is installed on inboard wall of burner hearth suitable position, and realization not only increases heat transfer area, but also improves the emissivity of burner hearth, more can be in burner hearth
Heat ray is effectively regulated and controled, it is regulated and controled from the disordered state of diffusion to orderly, is emitted directly toward and is heated material, improve heat
The arrival rate of ray strengthens radiant heat transfer, obtains significant volume increase and energy-saving effect.The technology improves sky to a certain extent
The problem of intracavitary emissivity and directed radiation.But the also very big room for promotion, and Blackbody element of the emissivity in burner hearth
Inner space be not fully utilized.
Summary of the invention
The deficiencies of not being fully used for the inner space of Blackbody element in industrial furnace in the prior art, this hair
It is bright to solve the problems, such as to be to provide a kind of porous radiation Blackbody element of the cavity that energy-saving effect can be improved.
In order to solve the above technical problems, the technical solution adopted by the present invention is that:
A kind of porous radiation Blackbody element of cavity of the present invention, is installed on furnace wall, generally cylindrical body, inner hollow,
Wherein one end is installation end, is fixed on furnace wall, and the other end is equipped with end cap towards material, in one end towards material, on end cap
Equipped with through-hole.
Through-hole is circle, and quantity is 7~10, and axle center arranges 1, other are distributed on concentric circle.
The gross area of through-hole accounts for the 20~28% of Blackbody element base area.
The length of each Blackbody element and the ratio of basal diameter are 5:4.
The magnesia-alumina brick that the Blackbody element is high using refractoriness, inoxidizability is strong is made；Hyperthermia radiation Blackbody element is preparatory
It is arranged on the refractory brick for building furnace wall, or be arranged simultaneously during building furnace wall.
The invention has the following beneficial effects and advantage:
1. the present invention can improve the blackness of Blackbody element to the greatest extent, increase the contact area of furnace gas and furnace wall, effectively
Raising stove thermal energy utilization rate, and cost is relatively low.
2. the configuration of the present invention is simple is easy to produce in batches manufacture, have the basis of mechanized continuous productive process, when in use,
Original furnace kiln structure is had no need to change, can be widely applied on various heating furnaces, and not aging substantially, in engineer application
Safety is higher.
Detailed description of the invention
Fig. 1 is scheme of installation of the porous Blackbody element of cavity of the present invention in heating furnace kiln；
Fig. 2 is the diagrammatic sectional view of the porous Blackbody element main view of cavity of the invention；
Fig. 3 is the top view of the porous Blackbody element of cavity of the invention.
Wherein, 1 is Blackbody element, and 2 be burner hearth, and 3 be furnace wall, and 4 be heating workpiece, and 5 be cavity, and 6 be through-hole.
Specific embodiment
The present invention is further elaborated with reference to the accompanying drawings of the specification.
As shown in Fig. 1~2, a kind of porous radiation Blackbody element of cavity of the present invention is installed on furnace wall 3, generally round
Cylinder, inner hollow, wherein one end is installation end, is fixed on furnace wall 3, the other end is towards material, in one end towards material
Equipped with end cap, end cap is equipped with through-hole 6.
As shown in figure 3, through-hole 6 is circle, quantity is 7~10, arranges 1 in cylindrical body axle center, other are distributed in circle
On the concentric circle face of cylinder.
The gross area of through-hole accounts for the 20~28% of 1 base area of Blackbody element, and the length of each Blackbody element 1 and bottom surface are straight
The ratio of diameter is 5:4.
The Blackbody element 1 is made of magnesia-alumina brick, and molding mode includes sinter molding and fusion cast process.Hyperthermia radiation black matrix
Element can be first arranged on the refractory brick for building furnace wall, can also be arranged simultaneously during building furnace wall.High temperature blackbody member
The axis of part 1 is directed toward the heated material in stove always.
Compared with other refractory brick, the refractoriness of magnesia-alumina brick is higher, up to 2000 DEG C or more, there is higher loading softening temperature
Degree, biggish high temperature mechanical strength, there are also the chemical erosions for resisting the basic clinker containing iron oxide and calcium oxide well
Performance can be very good to adapt to the hot environment in furnace.
In the present embodiment, the generally cylindrical body of Blackbody element 1, inside has cavity 5, and one end is equipped with end cap, sets on end cap
There are 7 through-holes, arrangement at cylindrical body axle center as shown in figure 3, be equipped with a hole, other are distributed in one heart in such a way that the center of circle is symmetrical
On round week；The other end is straight-tube shape, is mounted on furnace wall 3.Covering setting aperture in 1 lower end of Blackbody element is because of radiation
It can absorb and reflect by multiple in cavity 5 after aperture enters cavity 5, and it is every by primary absorption, and radiation energy is just pressed
It is weakened once according to the share of 1 inner wall absorptivity of Blackbody element, the energy of eventually off aperture is very little, it is believed that completely
It is absorbed in cavity 5.So for radiation characteristic, the aperture property the same with black-body surface.Manufacture Blackbody element material
Expect not influence the blackness of aperture on the size principle of the absorptance of itself.The share of aperture area and the cavity inner wall gross area
Smaller, the absorptance of aperture is higher, and blackness is also bigger.
If the absorptance in cavity is α, SHole/SCavity=f, SHoleFor the through-hole gross area, SCavityFor Blackbody element cavity cross section face
Product.Radiation energy Q passes through aperture by the external world and enters cavity.The variation of energy is as follows: after every secondary reflection
The energy that cavity inner wall absorbs:
QWall=α Q+ α (1-f) (1- α) Q+...+ α (1-f)n-1(1-α)n-1Q (1)
Simplified: |
Similarly, the energy reflected away across aperture:
The absorptivity of aperture:
In general, the absorptivity α on 1 surface of Blackbody element is 0.8.The area S of aperture in Blackbody element 1 of the inventionHole
=2.2 × 10-3m2, the area S of blackbody cavity 5Cavity=0.043m2, then f=0.05, αHole=0.987.Because industrial furnace furnace wall and
Steel billet can be considered unrestrained gray surface, can obtain the blackness ε of apertureHole=0.987.Blackness compared with not having foraminate surface, at aperture
23% is improved, according to this one Boltzmann's law of fence of making a mistake it is found that blackness increases heat flow increase so that its reflection, steel billet
Heating efficiency can also increase.
Meanwhile after installation Blackbody element 1 of the present invention, the area of 3 inner surface of furnace wall is also increased considerably.In Fuel Furnace
In, when high-temperature furnace gas is not much different with 3 internal surface temperature of furnace wall, the hot-fluid of high-temperature furnace gas and 3 inner surface radiation heat transfer of furnace wall
Amount are as follows:
In formula: εGIt is furnace gas in TGWhen blackness, εWFor the blackness of furnace wall inner surface, TGFor furnace gas temperature, TwFor furnace wall temperature
Degree, FWFor the area of burner hearth inner surface.
For Fuel Furnace, high-temperature furnace gas is contacted during continuous flowing, circulation with furnace wall and material, and furnace gas is not
Disconnected eradiation energy, therefore high-temperature furnace gas is that heat is provided into furnace in the form of two kinds of heat transfers of convection current and radiation.From above-mentioned public affairs
Formula can be seen that the addition of Blackbody element 1 of the present invention so that furnace wall 3 area FWIncrease, enhances in high-temperature furnace gas and furnace wall 3
The radiation heat transfer on surface, so that 2 internal surface temperature of burner hearth increases, therefore the heat exchange amount Q of billet surface is also enhanced, steel billet
The time that is heated greatly shorten, the exhaust gas temperature come out of the stove reduces, and reduces the consumption of fuel.Also, due to the present invention
Blackbody element 1 be hollow structure not only reduce manufacturing cost compared with traditional Blackbody element, improve economic benefit,
And the contact area of high-temperature furnace gas and Blackbody element 1 increases by about one time.
Numerous Blackbody elements 1 is installed on 3 appropriate location of furnace wall by the present invention, that is, increases heat transfer area, and improve
The emissivity of burner hearth 2.Meanwhile through-hole 6 is squeezed into the appropriate location of Blackbody element 1 can effectively increase Blackbody element 1 itself
Blackness improves the thermal efficiency in furnace to greatest extent.1 performance of Blackbody element stablize, substantially will not aging, the heat of burner hearth can be penetrated
Line is effectively regulated and controled, and is allowed to regulate and control from the disordered state of diffusion to orderly, is emitted directly toward heating object, improves heat ray
Arrival rate strengthens radiant heat transfer, obtains significant energy-saving effect.
Structure of the invention is simple, easy to accomplish, haves no need to change the structure of original stove, so that it may be widely used
On various heating furnaces, engineering construction solution security is strong.
Claims (5)
1. a kind of porous radiation Blackbody element of cavity, it is characterised in that: be installed on furnace wall, generally cylindrical body, in inside
Sky, wherein one end is installation end, is fixed on furnace wall, and the other end is equipped with end cap, end cap towards material, in one end towards material
It is equipped with through-hole.
2. the porous radiation Blackbody element of cavity according to claim 1, it is characterised in that: through-hole is circle, quantity 7
~10, axle center arranges 1, other are distributed on concentric circle.
3. the porous radiation Blackbody element of cavity according to claim 1, it is characterised in that: the gross area of through-hole accounts for black matrix
The 20~28% of element base area.
4. the porous radiation Blackbody element of cavity according to claim 1, it is characterised in that: the length of each Blackbody element
And the ratio of basal diameter is 5:4.
5. the porous radiation Blackbody element of cavity according to claim 1, it is characterised in that: the Blackbody element is using resistance to
The magnesia-alumina brick that fiery degree is high, inoxidizability is strong is made；Hyperthermia radiation Blackbody element is set in advance on the refractory brick for building furnace wall, or
Person is arranged simultaneously during building furnace wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910472374.6A CN110173994A (en) | 2019-05-31 | 2019-05-31 | A kind of porous radiation Blackbody element of cavity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910472374.6A CN110173994A (en) | 2019-05-31 | 2019-05-31 | A kind of porous radiation Blackbody element of cavity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110173994A true CN110173994A (en) | 2019-08-27 |
Family
ID=67696936
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910472374.6A Withdrawn CN110173994A (en) | 2019-05-31 | 2019-05-31 | A kind of porous radiation Blackbody element of cavity |
Country Status (1)
| Country | Link |
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| CN (1) | CN110173994A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111457736A (en) * | 2020-04-01 | 2020-07-28 | 常州大学 | Porous cavity radiation black body of heating furnace wall |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6280524A (en) * | 1985-10-04 | 1987-04-14 | Chino Corp | Production of blackbody furnace |
| CN2622629Y (en) * | 2003-02-27 | 2004-06-30 | 徐卫河 | Full-specturm radiation heat storage macroscopic microstructure of heat collector |
| CN202254823U (en) * | 2011-06-13 | 2012-05-30 | 王士敏 | High-absorption rate open hole cavity-formed refractory brick |
| CN202709741U (en) * | 2011-07-12 | 2013-01-30 | 北京瑞宇蓝天节能技术有限公司 | Fire-proof prefabricated member with multiple through holes and common cavity |
-
2019
- 2019-05-31 CN CN201910472374.6A patent/CN110173994A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6280524A (en) * | 1985-10-04 | 1987-04-14 | Chino Corp | Production of blackbody furnace |
| CN2622629Y (en) * | 2003-02-27 | 2004-06-30 | 徐卫河 | Full-specturm radiation heat storage macroscopic microstructure of heat collector |
| CN202254823U (en) * | 2011-06-13 | 2012-05-30 | 王士敏 | High-absorption rate open hole cavity-formed refractory brick |
| CN202709741U (en) * | 2011-07-12 | 2013-01-30 | 北京瑞宇蓝天节能技术有限公司 | Fire-proof prefabricated member with multiple through holes and common cavity |
Non-Patent Citations (1)
| Title |
|---|
| 李汉平: "黑体炉设计的讨论", 《激光与红外》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111457736A (en) * | 2020-04-01 | 2020-07-28 | 常州大学 | Porous cavity radiation black body of heating furnace wall |
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| PB01 | Publication | ||
| PB01 | Publication | ||
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Application publication date: 20190827 |