CN113564295A - Preheater device of blast furnace hot blast stove - Google Patents
Preheater device of blast furnace hot blast stove Download PDFInfo
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- CN113564295A CN113564295A CN202110586863.1A CN202110586863A CN113564295A CN 113564295 A CN113564295 A CN 113564295A CN 202110586863 A CN202110586863 A CN 202110586863A CN 113564295 A CN113564295 A CN 113564295A
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- fixedly connected
- dust collection
- blast furnace
- pipe
- dust
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B9/00—Stoves for heating the blast in blast furnaces
- C21B9/14—Preheating the combustion air
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
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- Chemical Kinetics & Catalysis (AREA)
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- Manufacturing & Machinery (AREA)
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- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Incineration Of Waste (AREA)
Abstract
The invention discloses a preheater device of a blast furnace hot blast stove, which comprises a preheating barrel, wherein a cross-shaped support is fixedly connected to the inner cavity wall of the preheating barrel, a suction fan is arranged on the left side wall of the cross-shaped support, a filter plate is fixedly connected to the inner cavity wall of the preheating barrel, a cleaning mechanism is arranged on the left side wall of the filter plate, an air inlet pipe is communicated with the left end surface of the preheating barrel, a dust collection mechanism is arranged on the upper end surface of the preheating barrel, a collection box is fixedly connected to the right side wall of the dust collection mechanism, a dust collection pipe is communicated with the lower end surface of the dust collection mechanism, a collection drawer is slidably connected to the front end surface of the collection box, and a dust outlet pipe of the dust collection mechanism is communicated with the collection box. This blast furnace hot-blast stove preheater device has solved the inconvenient dust and the slag to in the hot-blast furnace tail gas of current hot-blast furnace preheater and has filtered, and the inconvenient clearance of dust after filtering to and preheat the not good problem of effect.
Description
Technical Field
The invention relates to the technical field of hot blast stove preheaters, in particular to a preheater device of a blast furnace hot blast stove.
Background
The hot blast stove is one of main matched equipment of a blast furnace in an iron works, and is used for heating blast air to required temperature so as to improve the benefit and efficiency of the blast furnace. The hot blast heater is a heating surface which preheats air before entering a boiler to a certain temperature by using smoke in a flue at the tail part of the boiler through an internal radiating fin. The heat exchange performance of the boiler is improved, and the energy consumption is reduced.
The publication number is: CN201920717229.5 discloses an air preheater for blast furnace. This air heater for blast furnace, including fume means and air device, fume means's right side is provided with the air device fume means and includes the gas supply pipe, and the one end fixed mounting of gas supply pipe has the air supply fan, and the right side fixed mounting of air supply fan has the flue gas chamber, and the inside fixed mounting of flue gas chamber has the heat-conducting plate.
Above-mentioned patent document adopts the cooperation between air chamber and the thermistor, when guaranteeing that the air discharges, inside temperature must reach or exceed required process temperature, but inconvenient dust and slag in blast furnace and the hot-blast furnace tail gas filter, and the dust after filtering is inconvenient carries out effectual clearance, has reduced life to and the easy backward flow of steam in the pre-heater, cause easily that preheating effect is not good.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a preheater device of a blast furnace hot blast stove, which solves the problems that the conventional hot blast stove preheater is inconvenient to filter dust and slag in the tail gas of the hot blast stove, the filtered dust is inconvenient to clean and the preheating effect is poor.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: the utility model provides a blast furnace hot-blast stove preheater device, includes the preheating bucket, the inner chamber wall fixedly connected with cross support of preheating bucket, the left side wall of cross support is provided with the extraction fan, the inner chamber wall fixedly connected with filter of preheating bucket, the left side wall of filter is provided with cleans the mechanism, the left end face intercommunication of preheating bucket has the air-supply line, the up end of preheating bucket is provided with out the tuber pipe, the inner chamber wall of air-supply line is provided with sealing mechanism, the up end of preheating bucket is provided with dust absorption mechanism, dust absorption mechanism's right side wall fixedly connected with collecting box, dust absorption mechanism's lower terminal surface intercommunication has the dust absorption pipe, the preceding terminal surface sliding connection of collecting box has the collection drawer, dust absorption mechanism's play dirt pipe is linked together with the collecting box.
Preferably, the cleaning mechanism comprises a driving motor, a supporting plate, a first supporting shaft, a second supporting shaft, a large gear, a small gear, a cleaning brush, an end face gear ring, a fixed rod and a transmission shaft, the right end of the filtering plate is fixedly connected with the driving motor, and an output shaft of the driving motor penetrates through one end of the filtering plate and is fixedly connected with the transmission shaft.
Preferably, the outer wall of transmission shaft is through installation pole fixedly connected with backup pad, the preceding terminal surface of backup pad rotates respectively and is connected with first back shaft and second back shaft, the equal fixedly connected with brush cleaner of outer wall of first back shaft and second back shaft.
Preferably, the outer walls of the first supporting shaft and the second supporting shaft are respectively fixedly connected with a large gear and a small gear, the left side wall of the filtering plate is fixedly connected with an end face gear ring, and the left end face of the supporting plate is fixedly connected with a dust collection frame through a fixing rod.
Preferably, the bull gear meshes with the terminal surface ring gear mutually, the bull gear meshes with the pinion mutually, the rear end face intercommunication of dust absorption frame has the stand pipe, the stand pipe rotates with the dust absorption pipe and is connected and be linked together.
Preferably, sealing mechanism includes installation piece, spring, toper post and toper cover, the inner chamber wall symmetry fixedly connected with installation piece of air-supply line, the left side wall fixedly connected with spring of installation piece.
Preferably, the left end fixedly connected with toper post of spring, the inner chamber wall fixedly connected with toper cover of air-supply line, the inner wall and the toper post looks block of toper cover.
Preferably, the inner cavity wall of the preheating barrel close to the right side is provided with a heat preservation ring layer, and the right cavity wall of the preheating barrel is uniformly and fixedly connected with a heat conduction pipe.
Advantageous effects
The invention provides a preheater device of a blast furnace hot blast stove. The method has the following beneficial effects:
(1) the preheater device of the blast furnace hot blast stove comprises a collecting box, a dust collection mechanism, a dust collection pipe, a guide pipe, a dust collection frame, a collection drawer, a cleaning mechanism, a driving motor, a supporting plate, a first supporting shaft, a second supporting shaft, a large gear, a pinion, a cleaning brush, an end face gear ring and a fixed rod which are matched with a transmission shaft, wherein an air inlet pipe of a preheating barrel is communicated with the tail part of the hot blast stove, the upper end of an air outlet pipe is communicated with the feeding part of the hot blast stove, tail gas can be filtered by a filter plate when entering, dust and slag in the tail gas can be filtered, the dust and the slag can be prevented from entering the hot blast stove again, the driving motor and the dust collection mechanism can be opened after being filtered for a period of time, the driving motor can drive the supporting plate, the first supporting shaft and the second supporting shaft to rotate, the large gear can be driven to mesh with the end face gear ring when the first supporting shaft rotates, and the gear wheel can mesh the pinion and rotate, just drive two cleaning brushes and carry out reverse rotation, thereby roll up the dust of filter plate left side wall adhesion, and also can drive backup pad and dust absorption frame and rotate along with the dust absorption pipe when the transmission shaft rotates, make dust absorption mechanism just can inhale the inner chamber of collecting box by dust absorption pipe cooperation heat pipe and dust absorption frame with the dust of filter plate adhesion, can effectually clean the filter, the clean troublesome nature of manual work has been saved, the life of filter has also been improved.
(2) The preheater device of the blast furnace hot blast stove is characterized in that through the matching of the heat preservation ring layer, the heat conduction pipe, the sealing mechanism, the mounting block, the spring, the conical column and the conical sleeve, when tail gas of the hot blast stove enters from the air inlet pipe, wind power impacts the conical column to move rightwards and compress the spring, the conical column is separated from a joint leakage gap with the conical sleeve, the tail gas enters the right cavity wall of the preheating barrel, heat loss can be reduced through heat conduction of the heat conduction pipe and heat insulation of the heat insulation ring layer, the heat of the tail gas can better preheat air, the impact force of the gas can drive the conical column to move leftwards to be jointed with the conical sleeve again when the gas flows back, the gas flow backflow in the inner cavity of the preheating barrel can be effectively avoided, and the condition that the tail gas flows back to cause loss is not ensured, the potential safety hazard of the hot blast stove caused by backflow can be avoided, and the sealing performance and the preheating effect of the preheating device are improved.
Drawings
FIG. 1 is a schematic perspective view of the present invention;
FIG. 2 is a schematic view of a partially cut-away structure of the preheating barrel according to the present invention;
FIG. 3 is an enlarged view of area A of FIG. 2 according to the present invention;
FIG. 4 is a schematic view of a partially cut-away structure of an air inlet duct according to the present invention;
FIG. 5 is an enlarged view of the area B in FIG. 4 according to the present invention;
FIG. 6 is a schematic view of the installation structure of the guide tube and the dust suction tube according to the present invention.
In the figure: 1. preheating a barrel; 2. a cross-shaped bracket; 3. an exhaust fan; 4. a filter plate; 5. a cleaning mechanism; 51. A drive motor; 52. a support plate; 53. a first support shaft; 54. a second support shaft; 55. a bull gear; 56. a pinion gear; 57. cleaning with a brush; 58. an end face gear ring; 59. fixing the rod; 510. a drive shaft; 6. An air inlet pipe; 7. an air outlet pipe; 8. a sealing mechanism; 81. mounting blocks; 82. a spring; 83. a tapered post; 84. A conical sleeve; 9. a collection box; 10. a dust suction mechanism; 11. a dust collection pipe; 12. a guide tube; 13. a dust collection frame; 14. a collection drawer; 15. a heat conducting pipe; 16. and (5) a heat-insulating ring layer.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
Referring to fig. 1-6, the present invention provides a technical solution:
the first embodiment is as follows: a preheater device of a blast furnace hot blast stove comprises a preheating barrel 1, wherein a cross support 2 is fixedly connected to the inner cavity wall of the preheating barrel 1, an exhaust fan 3 is arranged on the left side wall of the cross support 2, a filter plate 4 is fixedly connected to the inner cavity wall of the preheating barrel 1, a cleaning mechanism 5 is arranged on the left side wall of the filter plate 4, a left end face of the preheating barrel 1 is communicated with an air inlet pipe 6, an air outlet pipe 7 is arranged on the upper end face of the preheating barrel 1, a sealing mechanism 8 is arranged on the inner cavity wall of the air inlet pipe 6, a dust collection mechanism 10 is arranged on the upper end face of the preheating barrel 1, a collection box 9 is fixedly connected to the right side wall of the dust collection mechanism 10, a dust collection pipe 11 is communicated with the lower end face of the dust collection mechanism 10, a collection drawer 14 is slidably connected to the front end face of the collection box 9, a dust outlet pipe of the dust collection mechanism 10 is communicated with the collection box 9, and the cleaning mechanism 5 comprises a driving motor 51, a support plate 52 and a first support shaft 53, A second supporting shaft 54, a gearwheel 55, a pinion 56, a cleaning brush 57, an end face gear ring 58, a fixing rod 59 and a transmission shaft 510, wherein the right end of the filter plate 4 is fixedly connected with a driving motor 51, one end of the driving motor 51, which penetrates through the filter plate 4, is fixedly connected with the transmission shaft 510, the outer wall of the transmission shaft 510 is fixedly connected with a supporting plate 52 through a mounting rod, the front end face of the supporting plate 52 is respectively and rotatably connected with a first supporting shaft 53 and a second supporting shaft 54, the outer walls of the first supporting shaft 53 and the second supporting shaft 54 are respectively and fixedly connected with the cleaning brush 57, the outer walls of the first supporting shaft 53 and the second supporting shaft 54 are respectively and fixedly connected with the gearwheel 55 and the pinion 56, the left side wall of the filter plate 4 is fixedly connected with the end face gear ring 58, the left end face of the supporting plate is fixedly connected with a dust collection frame 13 through the fixing rod 59, the gearwheel 55 is meshed with the end face gear ring 58, and the gearwheel 55 is meshed with the pinion 56, the rear end surface of the dust collection frame 13 is communicated with a guide pipe 12, and the guide pipe 12 is rotatably connected and communicated with the dust collection pipe 11. Through the matching of the collection box 9, the dust collection mechanism 10, the dust collection pipe 11, the guide pipe 12, the dust collection frame 13, the collection drawer 14, the cleaning mechanism 5, the driving motor 51, the support plate 52, the first support shaft 53, the second support shaft 54, the large gear 55, the small gear 56, the cleaning brush 57, the end face gear ring 58 and the fixed rod 59 with the transmission shaft 510, firstly, the air inlet pipe 6 of the preheating barrel 1 is communicated with the tail part of the hot blast stove, the upper end of the air outlet pipe 7 is communicated with the feeding part of the hot blast stove, the tail gas can be filtered by the filter plate 4 when entering, the dust and slag in the tail gas can be filtered, the dust and slag can be prevented from entering the hot blast stove again, the driving motor 51 and the dust collection mechanism 10 can be opened after being filtered for a period of time, the driving motor 51 can drive the support plate 52, the first support shaft 53 and the second support shaft 54 to rotate, the first support shaft 53 can drive the large gear 55 to be meshed with the end face gear ring 58 when rotating, and gear wheel 55 can mesh pinion 56 and rotate, just drive two brush cleaner 57 and carry out reverse rotation, thereby roll up the dust of filter 4 left side wall adhesion, and also can drive backup pad 52 and dust absorption frame 13 and rotate along with dust absorption pipe 11 when transmission shaft 510 rotates, make dust absorption mechanism 10 just can inhale the inner chamber of collecting box 9 by dust absorption pipe 11 cooperation heat pipe 15 and dust absorption frame 13 with the dust of filter 4 adhesion, can effectually clean filter 4, the troublesome nature of manual cleaning has been saved, the life of filter 4 has also been improved.
Example two: the difference between this embodiment and the first embodiment is: the sealing mechanism 8 comprises a mounting block 81, a spring 82, a conical column 83 and a conical sleeve 84, the mounting block 81 is symmetrically and fixedly connected to the inner cavity wall of the air inlet pipe 6, and the spring 82 is fixedly connected to the left side wall of the mounting block 81. The left end of the spring 82 is fixedly connected with a conical column 83, the inner cavity wall of the air inlet pipe 6 is fixedly connected with a conical sleeve 84, the inner wall of the conical sleeve 84 is clamped with the conical column 83, the inner cavity wall of the preheating barrel 1 close to the right side is provided with a heat preservation ring layer 16, and the right cavity wall of the preheating barrel 1 is uniformly and fixedly connected with a heat conduction pipe 15. Through the matching of the heat-insulating ring layer 16, the heat-conducting pipe 15, the sealing mechanism 8, the mounting block 81, the spring 82, the tapered column 83 and the tapered sleeve 84, when tail gas of the hot blast stove enters from the air inlet pipe 6, wind power impacts the conical column 83 to move rightwards and compress the spring 82, at the moment, the conical column 83 is separated from a joint leakage gap with the conical sleeve 84, the tail gas enters the right cavity wall of the preheating barrel 1, heat loss can be reduced through heat conduction of the heat conduction pipe 15 and heat insulation of the heat insulation ring layer 16, the heat of the tail gas can better preheat air, the impact force of the gas can drive the conical column 83 to move leftwards to be jointed with the conical sleeve 84 again when the gas flows back, the gas flow backflow in the inner cavity of the preheating barrel 1 can be effectively avoided, the condition that the tail gas backflow causes loss is not only ensured, the potential safety hazard of the hot blast stove caused by backflow can be avoided, and the sealing performance and the preheating effect of the preheating device are improved.
When the dust collecting device works, firstly, the air inlet pipe 6 of the preheating barrel 1 is communicated with the tail part of the hot blast stove, the upper end of the air outlet pipe 7 is communicated with the feeding part of the hot blast stove, tail gas can be filtered through the filter plate 4 when entering, dust and slag in the tail gas can be filtered, the dust and the slag can be prevented from entering the hot blast stove again, the driving motor 51 and the dust collecting mechanism 10 can be opened after being filtered for a period of time, the driving motor 51 can drive the supporting plate 52, the first supporting shaft 53 and the second supporting shaft 54 to rotate when rotating, the first supporting shaft 53 can drive the large gear 55 to be meshed with the end face gear ring 58, the large gear 55 can be meshed with the small gear 56 to rotate, the two cleaning brushes 57 are driven to rotate reversely, so that the dust adhered to the left side wall of the filter plate 4 is rolled up, and the driving plate 52 and the dust collecting frame 13 can be driven to rotate together with the dust collecting pipe 11 when the driving shaft 510 rotates, so that the dust suction mechanism 10 can suck dust adhered to the filter plate 4 into the inner cavity of the collection box 9 by the dust suction pipe 11 in cooperation with the heat conduction pipe 15 and the dust suction frame 13, the filter plate 4 can be effectively cleaned, the troublesome of manual cleaning is saved, the service life of the filter plate 4 is also improved, when tail gas of the hot blast stove enters from the air inlet pipe 6, wind power can impact the conical column 83 to move rightwards and compress the spring 82, at the moment, the conical column 83 is separated from a joint leakage gap with the conical sleeve 84, the tail gas can enter the right cavity wall of the preheating barrel 1, the heat loss can be reduced through the heat conduction of the heat conduction pipe 15 and the heat preservation of the heat preservation ring layer 16, the heat of the tail gas can better preheat the air, the impact force of the gas during the air flow backflow can drive the conical column 83 to move leftwards to be jointed with the conical sleeve 84 again, the air flow backflow in the inner cavity of the preheating barrel 1 can be effectively avoided, and the condition that the tail gas backflow cannot cause loss is not only ensured, the potential safety hazard of the hot blast stove caused by backflow can be avoided, and the sealing performance and the preheating effect of the preheating device are improved.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
Claims (8)
1. The utility model provides a blast furnace hot-blast stove preheater device, includes preheating bucket (1), its characterized in that: the preheating device is characterized in that a cross support (2) is fixedly connected to the inner cavity wall of the preheating barrel (1), an exhaust fan (3) is arranged on the left side wall of the cross support (2), a filter plate (4) is fixedly connected to the inner cavity wall of the preheating barrel (1), a cleaning mechanism (5) is arranged on the left side wall of the filter plate (4), the left end face of the preheating barrel (1) is communicated with an air inlet pipe (6), an air outlet pipe (7) is arranged on the upper end face of the preheating barrel (1), a sealing mechanism (8) is arranged on the inner cavity wall of the air inlet pipe (6), a dust collection mechanism (10) is arranged on the upper end face of the preheating barrel (1), a collection box (9) is fixedly connected to the right side wall of the dust collection mechanism (10), a dust collection pipe (11) is communicated with the lower end face of the dust collection mechanism (10), and a collection drawer (14) is slidably connected to the front end face of the collection box (9), the dust outlet pipe of the dust collection mechanism (10) is communicated with the collection box (9).
2. A preheater unit for a blast furnace hot blast stove according to claim 1, wherein: clean mechanism (5) including driving motor (51), backup pad (52), first support shaft (53), second support shaft (54), gear wheel (55), pinion (56), cleaning brush (57), terminal surface ring gear (58), dead lever (59) and transmission shaft (510), the right-hand member fixedly connected with driving motor (51) of filter (4), the one end fixedly connected with transmission shaft (510) of filter (4) are run through to the output shaft of driving motor (51).
3. A preheater unit for a blast furnace hot blast stove according to claim 2, wherein: the outer wall of transmission shaft (510) is through installation pole fixedly connected with backup pad (52), the preceding terminal surface of backup pad (52) rotates respectively and is connected with first back shaft (53) and second back shaft (54), the equal fixedly connected with brush cleaner (57) of outer wall of first back shaft (53) and second back shaft (54).
4. A preheater unit for a blast furnace hot blast stove according to claim 3, wherein: the outer walls of the first supporting shaft (53) and the second supporting shaft (54) are respectively fixedly connected with a large gear (55) and a small gear (56), the left side wall of the filtering plate (4) is fixedly connected with an end face gear ring (58), and the left end face of the supporting plate is fixedly connected with a dust collection frame (13) through a fixing rod (59).
5. A preheater unit for a blast furnace stove as claimed in claim 4, wherein: the large gear (55) is meshed with the end face gear ring (58), the large gear (55) is meshed with the small gear (56), the rear end face of the dust collection frame (13) is communicated with the guide pipe (12), and the guide pipe (12) is rotatably connected with the dust collection pipe (11) and communicated with the dust collection pipe.
6. A preheater unit for a blast furnace hot blast stove according to claim 1, wherein: sealing mechanism (8) are including installation piece (81), spring (82), toper post (83) and toper cover (84), the inner chamber wall symmetry fixedly connected with installation piece (81) of air-supply line (6), the left side wall fixedly connected with spring (82) of installation piece (81).
7. A preheater unit for a blast furnace hot blast stove according to claim 6, wherein: the left end fixedly connected with toper post (83) of spring (82), the inner chamber wall fixedly connected with toper cover (84) of air-supply line (6), the inner wall and the toper post (83) looks block of toper cover (84).
8. A preheater unit for a blast furnace hot blast stove according to claim 1, wherein: the inner cavity wall of the preheating barrel (1) close to the right side is provided with a heat preservation ring layer (16), and the right cavity wall of the preheating barrel (1) is uniformly and fixedly connected with a heat conduction pipe (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110586863.1A CN113564295A (en) | 2021-05-27 | 2021-05-27 | Preheater device of blast furnace hot blast stove |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110586863.1A CN113564295A (en) | 2021-05-27 | 2021-05-27 | Preheater device of blast furnace hot blast stove |
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| Publication Number | Publication Date |
|---|---|
| CN113564295A true CN113564295A (en) | 2021-10-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110586863.1A Pending CN113564295A (en) | 2021-05-27 | 2021-05-27 | Preheater device of blast furnace hot blast stove |
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| Country | Link |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB396111A (en) * | 1932-02-19 | 1933-08-03 | George Frederick Thomson | A process for utilising the waste heat and gases obtained from the blast furnace hot air stoves, boilers and connecting channels |
| CN210601695U (en) * | 2019-08-06 | 2020-05-22 | 河南省豫园锅炉机电有限公司 | Flue gas full-circulation hot blast stove |
| CN211689137U (en) * | 2019-12-18 | 2020-10-16 | 成渝钒钛科技有限公司 | Safety device for preheater of blast furnace hot blast stove |
| CN212585563U (en) * | 2020-07-03 | 2021-02-23 | 天津普惠节能环保设备有限公司 | Flue gas heat exchanger with good dust removal effect |
| CN213207920U (en) * | 2020-09-01 | 2021-05-14 | 戴振宇 | Air preheater of natural gas heat supply boiler |
-
2021
- 2021-05-27 CN CN202110586863.1A patent/CN113564295A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB396111A (en) * | 1932-02-19 | 1933-08-03 | George Frederick Thomson | A process for utilising the waste heat and gases obtained from the blast furnace hot air stoves, boilers and connecting channels |
| CN210601695U (en) * | 2019-08-06 | 2020-05-22 | 河南省豫园锅炉机电有限公司 | Flue gas full-circulation hot blast stove |
| CN211689137U (en) * | 2019-12-18 | 2020-10-16 | 成渝钒钛科技有限公司 | Safety device for preheater of blast furnace hot blast stove |
| CN212585563U (en) * | 2020-07-03 | 2021-02-23 | 天津普惠节能环保设备有限公司 | Flue gas heat exchanger with good dust removal effect |
| CN213207920U (en) * | 2020-09-01 | 2021-05-14 | 戴振宇 | Air preheater of natural gas heat supply boiler |
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Application publication date: 20211029 |