CN106765240B - Device for washing down smoke-proof feather of chimney - Google Patents
Device for washing down smoke-proof feather of chimney Download PDFInfo
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- CN106765240B CN106765240B CN201710118472.0A CN201710118472A CN106765240B CN 106765240 B CN106765240 B CN 106765240B CN 201710118472 A CN201710118472 A CN 201710118472A CN 106765240 B CN106765240 B CN 106765240B
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- chimney
- necking
- smoke plume
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J13/00—Fittings for chimneys or flues
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
- Y02A50/2351—Atmospheric particulate matter [PM], e.g. carbon smoke microparticles, smog, aerosol particles, dust
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- General Engineering & Computer Science (AREA)
- Chimneys And Flues (AREA)
Abstract
The invention provides a smoke plume downward-washing prevention device for a chimney, which is characterized in that a necking is additionally arranged at the top of the chimney through CFD fluid dynamics simulation design, a wind shield is arranged on the outer wall of the necking, so that smoke is discharged through the necking, the flow rate of a smoke outlet is improved, and meanwhile, the arranged wind shield can improve the local vertical wind speed of the outer wall of the necking, and the two wind shields are combined to effectively raise the height of the smoke plume, so that the smoke plume downward-washing phenomenon is prevented. Through the device, the smoke plume can be prevented from contacting the chimney body, and the hidden danger of chimney icing is fundamentally eliminated. Compared with the existing electric heating device, the device can thoroughly solve the problem of chimney icing caused by smoke plume washing, and meanwhile, the device is simple in structure, low in cost, safe and reliable and basically free of maintenance cost in the later period due to the adoption of modularized design and installation. The invention is suitable for various chimneys such as concrete single cylinder, brick sleeve, steel sleeve, glass fiber reinforced plastic and the like in thermal power plants.
Description
Technical Field
The invention relates to the technical field of chimneys, in particular to a device for washing down smoke prevention feathers of a chimney.
Background
Over 90% of thermal power generating units with more than 300MW in China adopt limestone-gypsum Wet Flue Gas Desulfurization (WFGD) technology, and early WFGD systems are all provided with flue gas heat exchangers (GGH) so that the temperature of flue gas after desulfurization reaches more than 80 ℃ and is discharged. However, in actual operation, serious corrosion, element blockage and other problems of GGH parts can occur, and the safe and stable operation of the desulfurization system is affected, so that most of power plant desulfurization systems in the later stage are not provided with GGH, and the original GGH is gradually removed. In a wet desulfurization system without a GGH, the flue gas temperature is about 50 ℃, wherein the moisture is near saturation, forming a "wet stack" discharge. The flue gas is easy to condense into liquid drops in the process of discharging the chimney, and meanwhile, when the air flow transversely flows through the chimney when side wind exists in the atmosphere, a local vortex area can be generated in a downwind area of the chimney and negative pressure is generated, so that the flue gas at the outlet of the chimney deflects and even the phenomenon of 'flue gas washing down' occurs. The chimney cylinder body is in direct contact with saturated wet flue gas, and the structural material of the chimney cylinder body is easy to corrode acid liquid drops in the flue gas. Especially when the environmental temperature is lower in winter in the north, the acidic condensate can freeze near the downwind chimney, and when the wind direction changes or the environmental temperature rises, the ice cubes are melted, so that great hidden danger can be caused for personnel safety around the chimney and normal operation of equipment. When the icing phenomenon is serious, the weight of the side face of the chimney is unbalanced, so that the normal swing amplitude of the chimney at high altitude is unbalanced, and the service life of the chimney is influenced.
At present, no patent specially aiming at the problem of smoke plume washing of a chimney exists in China, only some patents aim at the problem of chimney icing, the chimney icing prevention devices are mostly electric heating devices, and patent CN201010580644 provides a chimney mouth icing prevention electric heating device which utilizes electric energy to heat the surrounding area of the chimney so as to prevent icing. The device needs an external cable to be communicated with a chimney, so that the icing problem can be solved to a certain extent, but the device has the problems of high energy consumption, high construction and maintenance cost, high overhaul difficulty, high operation cost, short service life and the like; patent CN201610153810 proposes a method for installing a heating pipe network on the outer cylinder wall by using hot water and hot water pipes of a power plant to solve the problem of chimney icing, the method needs to arrange the hot water pipes on the chimney to uniformly emit heat, the method saves energy sources compared with an electric heating device, but the chimney height of the power plant is generally 180-270 meters, which requires a high-power high-pressure water pump, the energy consumption is not small, and the problems of difficult construction and maintenance and resource consumption are also necessarily present.
Fundamentally, the electric heating device or the heat supply pipeline in the technical scheme only converts heat energy generated by the device into internal energy of smoke, consumes a large amount of energy, avoids condensation and icing of the smoke, but cannot solve the problem of washing down the smoke plume. Because the electric heating device or the heat supply pipeline is arranged on the chimney, the structural materials on the outer wall of the chimney including the electric heating device or the heat supply pipeline arranged on the chimney are corroded by acid liquid drops in the flue gas due to downward washing of the flue gas, and the performances and the service life of the chimney and the electric heating device or the heat supply pipeline are also influenced along with the time.
Disclosure of Invention
The invention aims to provide a device for preventing smoke plume from being washed down, which can solve the problem of chimney icing caused by smoke plume washing down.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the utility model provides a device that is used for smoke protection feather of chimney to wash down, includes throat and a plurality of deep bead, the throat is installed at the top of chimney and with the chimney link up, the top internal diameter of throat is less than the bottom internal diameter of throat, a plurality of deep bead are along the length direction of throat is arranged the leeward side of the outer wall of throat.
Preferably, the wind deflector comprises a first vertical plate and a second vertical plate, and the first vertical plate and the second vertical plate are mutually and vertically connected; the second vertical plate is arranged on the outer wall of the necking along the length direction of the necking, the first vertical plate is parallel to the outer wall of the necking, and the cross sections of the first vertical plate and the second vertical plate form a T-shaped structure.
Preferably, the height of the necking and the wind deflector is 1m-10m, the distance between the wind deflector and the outer wall of the necking is 100mm-300mm, and the distance between adjacent wind deflectors is 2m-3m.
Preferably, the device further comprises a reinforcing plate disposed at the top of the constriction and bent inwards along the top of the constriction.
Preferably, the necking and the wind deflector are made of glass fiber reinforced plastic or polypropylene plastic plates, and the wind deflector is of an integrally formed structure.
Preferably, the necking is formed by assembling modules, the modules are of an integrated structure, the modules are fixedly connected through vertical mounting edges arranged along the length direction, and the vertical mounting edges are sealed through rubber gaskets.
Preferably, a plurality of wind deflectors are secured in parallel to the upright mounting edge.
Preferably, the device for washing down the smoke prevention feathers of the chimney further comprises a circumferential mounting edge, wherein the circumferential mounting edge is arranged at the bottom of the outer wall of the necking and is positioned between the adjacent vertical mounting edges, and reinforcing ribs are arranged on the circumferential mounting edge.
Preferably, a circle of drain holes are arranged at the bottom of the necking.
The invention does not need to consume energy, and the provided necking can improve the outlet speed of the flue gas; the provided wind shield can improve the local vertical wind speed of the outer wall of the necking, and the wind shield and the chimney can be combined to effectively raise the height of the smoke plume, prevent the smoke plume from being washed down, avoid the contact between the smoke and the chimney body, and eliminate the hidden danger of chimney icing.
The necking and wind shield which are designed and manufactured in a modularized mode effectively reduces the difficulty of high-altitude operation, reduces extra energy consumption and operation and maintenance cost, and simultaneously, under the condition of good conditions, the service life of the device can reach 20 years, thereby meeting the requirements of energy conservation, environmental protection and circular economy development.
The invention is suitable for various chimneys such as concrete single cylinder, brick sleeve, steel sleeve, glass fiber reinforced plastic and the like in thermal power plants, and is also suitable for small industrial boiler chimneys such as steel plants, paper mills and the like.
The invention is successfully applied to a 2X 600MW coal-fired unit of a certain power plant, solves the problem of downward washing of smoke plume of a chimney, has good operation, does not have icing phenomenon of the chimney when running in winter, and is extremely convenient and simple in construction and installation process.
Drawings
FIG. 1 is a schematic installation view of a device for smoke plume scrubbing of a chimney of the present invention;
FIG. 2 is a view of section A-A of FIG. 1;
FIG. 3 is a B-directed view of FIG. 1;
FIG. 4a is a perspective view of a wind deflector according to the present invention;
FIG. 4b is a cross-sectional view of a wind deflector of the present invention;
FIG. 5 is a schematic installation view of a device for smoke plume scrubbing of a chimney of the present invention;
FIG. 6 is a schematic installation view of a device for smoke plume scrubbing of a chimney of the present invention;
fig. 7 is a view taken from A-A of fig. 6.
In the figure, 1-necking; 2-wind deflector; 3-bolts; 4-expansion bolts; 5-vertical installation edges; 6, reinforcing ribs; 7-a circumferential mounting edge; 8-a chimney inner barrel; 9-pressing the chimney concrete; 10-a chimney outer cylinder; 11-drainage holes; 12-a rubber gasket; 13-vertical rib plates; 14-a circumferential rib plate; 15-reinforcing hoops; 16-a heat insulation layer; 17-superfine glass wool; 18-laying a lining; 19-rain cover plate.
Detailed Description
To make the objects, technical solutions and advantages of the present invention more apparent, the following description of the design process of the present invention is provided, which includes the following steps:
And 3, carrying out modularized design and manufacture according to the sizes of the necking and the wind shield plates. According to different chimney types, the necking and the wind shield are made of different materials: when the chimney is a single-cylinder concrete chimney, a brick sleeve or a glass fiber reinforced plastic chimney, the necking and the wind shield are made of glass fiber reinforced plastic or polypropylene plastic; when the chimney is a steel inner cylinder or a titanium steel composite plate inner cylinder, the necking and the wind shield are made of metal materials consistent with the inner cylinder.
Step 4, performing field installation, namely firstly leveling the surface of the top of the original chimney, selecting different fixing modes of the necking and the wind shield according to different materials, and fixing a glass fiber reinforced plastic or polypropylene plastic plate device on the top surface of the chimney through expansion bolts, wherein all modules are connected through nickel-based alloy bolts or polypropylene bolts; the metal device is fixed on the bottom surface of the chimney through welding or expansion bolts, and the modules are connected through welding or bolts;
and 5, carrying out anti-corrosion treatment on the installation surface after the construction is completed.
Example 1
In the embodiment, the chimney is a brick inner cylinder chimney, the chimney outer cylinder is made of reinforced concrete, and the chimney inner cylinder is composed of acid-resistant bricks. The height of the inner cylinder of the chimney is 210m, the diameter of the outlet is 7.5m, and the flue gas treatment capacity of the unit is 3624074m under 100% load 3 And/h, the minimum operation load of the unit is 45%, the air speed at the outlet of the inner cylinder of the chimney is 8.7m/s, and the density of flue gas is 1.025kg/m 3 Air density of 1.17kg/m 3 。
Firstly, a three-dimensional mathematical model of the wet chimney is established according to the parameters, and the occurrence of the condition that the smoke plume is washed down is predicted by CFD fluid simulation when the unit load of the chimney is less than 75%.
Then, determining a smoke plume washing track and an influence range under the lowest running load through CFD fluid dynamics simulation; further, the structural design of the device is determined through simulation, the phenomenon that smoke plume is washed down is avoided, the design comprises a necking, a wind shield and a matched device, and the necking and the wind shield are modularized components.
As shown in fig. 1 to 4, a device for washing down smoke prevention feathers of a chimney comprises a shrinkage 1 and a plurality of wind shields 2, wherein the shrinkage 1 is arranged at the top of the chimney and the shrinkage 1 is communicated with the chimney, the inner diameter of the top of the shrinkage 1 is smaller than the inner diameter of the bottom of the shrinkage 1, and the wind shields 2 are arranged at one side of the outer wall of the shrinkage 1 along the length direction of the shrinkage 1. The fact that the top inner diameter of the necking 1 is smaller than the bottom inner diameter of the necking 1 means that the through hole in the necking 1 is of a tapered structure from bottom to top. The throat 1 is communicated with the chimney, and the bottom inner diameter of the throat 1 is generally considered to be equal to the top inner diameter of the chimney. According to the invention, the top of the chimney is additionally provided with the necking 1, and the special wind shield 2 is provided, so that the smoke is discharged through the necking 1, the flow speed of a smoke outlet is improved, and meanwhile, the provided wind shield 2 can improve the local vertical wind speed of the outer wall of the necking 1, and the two wind shields are combined to effectively raise the height of the smoke plume, prevent the smoke plume from being washed down, avoid the smoke from contacting with the chimney body, and eliminate the hidden danger of icing of the chimney.
The wind deflector 2 comprises a first vertical plate and a second vertical plate which are mutually and vertically connected; the second riser is arranged on the outer wall of the necking 1 along the length direction of the necking 1, and the first riser is parallel to the outer wall of the necking 1, and the cross sections of the first riser and the second riser form a T-shaped structure. And a relatively independent space region, namely an atmosphere channel, is formed between the first vertical plate and the outer wall of the necking 1, so that the local vertical wind speed of the outer wall of the necking 1 is improved, the height of the plume is raised, and the phenomenon of washing down the plume is prevented. The reason why the first riser and the second riser adopt the flat plate structure is that the design, manufacture and installation thereof are relatively simple and convenient, but not limited thereto.
The arrangement of the wind shield 2 is determined according to the range of the smoke plume washing, and the wind shield 2 is not required to be arranged at the place where the smoke plume washing is not contacted. The method comprises the steps of collecting local multi-year meteorological data of a power plant, analyzing and determining the downwind direction of the maximum wind frequency in the year or in the winter, namely the leeward side, obtaining the approximate track direction of the chimney plume, determining the accurate track and influence range of the downward washing of the plume through CFD simulation, and further determining the arrangement position of the wind shield 2.
The height of the necking 1 and the wind deflector 2 is 1m-10m, the distance between the wind deflector 2 and the outer wall of the necking 1 is 100mm-300mm, and the distance between adjacent wind deflectors 2 is 2m-3m. The design parameters are related to specific chimney and working conditions, such as the diameter of the chimney, the maximum smoke amount, the worst environmental temperature, the wind frequency, the worst wind speed and the like, and the settings are different in different conditions, and the parameter ranges are obtained according to repeated tests of various working conditions and different chimney types. Finally, the most economical and applicable arrangement applied to specific projects, such as the size of the shrinkage 1, the distance between the wind shields 2, the number of the wind shields 2 and the like, needs to be obtained according to CFD fluid dynamics simulation test.
The present embodiment further includes a reinforcing plate provided at the top of the reduction mouth 1 and bent inward along the top of the reduction mouth 1. In the design, the reinforcing plate has the reinforcing effect on one hand and further has the effect of improving the speed of the smoke outlet on the other hand (the reinforcing plate is bent inwards to reduce the section of the smoke outlet and increase the smoke speed); the flue gas is concentrated in the middle of the outlet of the chimney to a certain extent to be discharged, so that the contact opportunity with the chimney is reduced; if condensate exists, the condensate flowing upwards along with the flue gas can be effectively blocked, and the phenomenon that the condensate is flushed out of a chimney to generate chimney rain is prevented.
The necking 1 and the wind deflector 2 are made of glass fiber reinforced plastic or polypropylene plastic plates, and the wind deflector 2 is integrally formed.
The necking 1 is formed by assembling modules, the modules are fixedly connected through vertical installation edges 5 arranged along the length direction, and the vertical installation edges 5 are sealed through rubber gaskets 12. The rubber gasket 12 ensures the air tightness of the modularized assembled necking 1, and the necking 1 adopts a modularized design, an integrated structure and a slicing manufacturing, thereby being convenient for high-altitude construction.
A plurality of wind deflectors 2 are fastened in parallel to the vertical mounting edge 5.
The embodiment comprises a vertical installation edge 5, a circular installation edge 7 and reinforcing ribs 6; the vertical installation edges 5 are provided with installation holes in advance, the second vertical plates are provided with uniformly distributed bolt holes, and the second vertical plates are fixedly connected with the vertical installation edges 5 through bolts 3; the annular mounting edges 7 are arranged at the bottom of the outer wall of the necking 1 and positioned between the adjacent vertical mounting edges 5; the annular mounting edge 7 is provided with a reinforcing rib 6, and the reinforcing rib 6 is used for reinforcing the strength of the annular mounting edge 7.
The original chimney comprises a chimney inner cylinder 8, a chimney outer cylinder 10 and a chimney concrete capping 9. In the device, the annular mounting edge 7 is fixedly connected with the chimney concrete coping 9 through the expansion bolts 4.
According to the invention, the CFD simulation shows that the diameter of the bottom of the necking 1 of the device is the same as the diameter of the inner cylinder 8 of the chimney, the diameter of the top outlet is 6.4 meters, and the heights of the necking 1 and the wind shield 2 are 7.7 meters. It should be noted that the inner diameter of the outlet is not too small, so that the condensate on the wall surface of the inner cylinder 8 of the chimney is prevented from being brought out by the excessive speed of the flue gas. The bottom of the necking 1 is provided with a circle of water discharge holes 11, so that the accumulated liquid at the bottom of the necking 1 is timely discharged into the inner cylinder 8 of the chimney, and acid liquid is prevented from penetrating into the necking 1 and the chimney.
Example 2
FIG. 5 is a schematic installation view of a device for smoke plume scrubbing of a chimney of the present embodiment; the A-A cross-section is the same as that of figure 2.
This embodiment differs from embodiment 1 in that: the device is applied to a single-cylinder concrete chimney, and the chimney comprises a masonry lining 18, a heat insulation layer 16, a chimney outer cylinder 10 and a chimney concrete capping 9.
Example 3
FIG. 6 is a schematic installation view of a device for smoke plume scrubbing of a chimney of the present embodiment; fig. 7 is a sectional view A-A of fig. 6.
This embodiment differs from the first two embodiments in that:
(1) The device is applied to a steel inner cylinder chimney, and the steel inner cylinder chimney comprises a chimney inner cylinder 8, a chimney outer cylinder 10, superfine glass wool 17 and a rain cover plate 19. The chimney outer cylinder 10 is made of reinforced concrete, and the chimney inner cylinder 8 is a steel inner cylinder.
(2) In this embodiment, the materials of the necking 1 and the wind deflector 2 are different from those of the first two embodiments, and in this embodiment, the necking 1 and the wind deflector 2 are made of steel inner cylinders; the modularized components are connected through welding, the necking 1 is fixed with the steel inner cylinder through welding, and the wind shield 2 is fixed with the necking 1 through welding.
(3) In this embodiment, the vertical rib plate 13, the annular rib plate 14 and the reinforcing hoop 15 are adopted, wherein the reinforcing hoop and the necking are not integrally formed. The vertical rib plates 13 are used for reinforcing the axial strength of the necking 1, the annular rib plates 14 are used for increasing the radial strength of the necking 1, and the reinforcing hoops 15 play a reinforcing role and improve the overall strength of the device. The reinforcing collar 15 is fixed to the throat 1 by welding, and if it is welded to the inside of the throat 1, the overall strength of the device is at risk during the flushing of the smoke, so that it is preferably welded to the outer wall of the throat 1.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (8)
1. A device for smoke plume scrubbing of a chimney, characterized in that: the air-cooling type chimney comprises a shrinkage opening and a plurality of air shields, wherein the shrinkage opening is arranged at the top of a chimney and is communicated with the chimney, the inner diameter of the top of the shrinkage opening is smaller than the inner diameter of the bottom of the shrinkage opening, and the air shields are arranged on the leeward side of the outer wall of the shrinkage opening along the length direction of the shrinkage opening; the wind shield comprises a first vertical plate and a second vertical plate, and the first vertical plate and the second vertical plate are mutually and vertically connected; the second vertical plate is arranged on the outer wall of the necking along the axial direction of the necking, the first vertical plate is parallel to the outer wall of the necking, and the cross sections of the first vertical plate and the second vertical plate form a T-shaped structure.
2. A smoke plume protection device for a chimney as claimed in claim 1, wherein: the height of the necking and the wind deflector is 1m-10m, the distance between the wind deflector and the outer wall of the necking is 100mm-300mm, and the distance between every two adjacent wind deflectors is 2m-3m.
3. A smoke plume protection device for a chimney as claimed in claim 1, wherein: the device comprises a reinforcing plate, wherein the reinforcing plate is arranged at the top of the necking and is bent inwards along the top of the necking.
4. A smoke plume abatement apparatus for a chimney as claimed in claim 3, wherein: the necking and the wind deflector are made of glass fiber reinforced plastic, and the wind deflector is of an integrally formed structure.
5. A smoke plume protection device for a chimney as claimed in claim 1, wherein: the necking is formed by assembling modules, the necking is fixedly connected through vertical installation edges arranged along the length direction, and the vertical installation edges are sealed through rubber gaskets.
6. A smoke plume protection device for a chimney as claimed in claim 5, wherein: a plurality of wind shields are fixed on the vertical mounting edge in parallel.
7. A smoke plume protection device for a chimney as claimed in claim 6, wherein: the novel plastic pipe is characterized by further comprising annular mounting edges, wherein the annular mounting edges are arranged at the bottom of the necking outer wall and located between the adjacent vertical mounting edges, and reinforcing ribs are arranged on the annular mounting edges.
8. A smoke plume protection device for a chimney as claimed in claim 1, wherein: and a drain hole is arranged at the bottom of the necking.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710118472.0A CN106765240B (en) | 2017-03-01 | 2017-03-01 | Device for washing down smoke-proof feather of chimney |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710118472.0A CN106765240B (en) | 2017-03-01 | 2017-03-01 | Device for washing down smoke-proof feather of chimney |
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| CN106765240A CN106765240A (en) | 2017-05-31 |
| CN106765240B true CN106765240B (en) | 2023-04-28 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86106000A (en) * | 1986-08-30 | 1987-05-20 | 四川建筑材料工业学院 | Novel vertical kiln |
| EP0384921A1 (en) * | 1989-02-28 | 1990-09-05 | Hugo Paril | Chimney cowl |
| DE4307556A1 (en) * | 1993-03-10 | 1994-09-15 | Guenther Dipl Ing Schneider | Chimney with waste-gas line |
| CN2440173Y (en) * | 2000-04-10 | 2001-07-25 | 万国瑞 | Bucket-shaped cooking fume exhauster |
| CN101215631A (en) * | 2007-12-28 | 2008-07-09 | 北京科技大学 | Iron ore fluidized bed magnetizing roasting device |
| CN204006049U (en) * | 2014-05-30 | 2014-12-10 | 上海迪夫格环境科技有限公司 | Guide vane and wet flue gas flue for wet flue gas flue |
-
2017
- 2017-03-01 CN CN201710118472.0A patent/CN106765240B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86106000A (en) * | 1986-08-30 | 1987-05-20 | 四川建筑材料工业学院 | Novel vertical kiln |
| EP0384921A1 (en) * | 1989-02-28 | 1990-09-05 | Hugo Paril | Chimney cowl |
| DE4307556A1 (en) * | 1993-03-10 | 1994-09-15 | Guenther Dipl Ing Schneider | Chimney with waste-gas line |
| CN2440173Y (en) * | 2000-04-10 | 2001-07-25 | 万国瑞 | Bucket-shaped cooking fume exhauster |
| CN101215631A (en) * | 2007-12-28 | 2008-07-09 | 北京科技大学 | Iron ore fluidized bed magnetizing roasting device |
| CN204006049U (en) * | 2014-05-30 | 2014-12-10 | 上海迪夫格环境科技有限公司 | Guide vane and wet flue gas flue for wet flue gas flue |
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| CN106765240A (en) | 2017-05-31 |
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