CN217109626U - Positive pressure direct-blowing coal mill primary hot air bypass device - Google Patents
Positive pressure direct-blowing coal mill primary hot air bypass device Download PDFInfo
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- CN217109626U CN217109626U CN202220415383.9U CN202220415383U CN217109626U CN 217109626 U CN217109626 U CN 217109626U CN 202220415383 U CN202220415383 U CN 202220415383U CN 217109626 U CN217109626 U CN 217109626U
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Abstract
The utility model provides a hot-blast by-pass device of malleation direct-fired formula coal pulverizer, it includes: the coal feeding device comprises an upper bypass device, a connecting pipeline and a lower bypass device, wherein the upper bypass device and one end of the lower bypass device, which is far away from a central coal dropping pipe, are connected in parallel and are connected with a primary hot air inlet pipe through the connecting pipeline, and hot air is blown into the connecting pipeline from the primary hot air inlet pipe and then blown into the upper bypass device and the lower bypass device; the other ends of the upper bypass device and the lower bypass device are respectively connected with the upper end and the lower end of a central coal dropping pipe in the mill; the upper bypass device can blow air downwards and obliquely downwards, and the lower bypass device can blow air downwards and obliquely upwards. The utility model discloses a hot-blast bypass device simple structure implements the degree of difficulty little, does not increase the hot-blast flow of the plenum of coal pulverizer, does not increase nozzle ring department velocity of flow to do not increase the wearing and tearing of coal pulverizer, do not influence the flow field of the interior wind-powder mixture of mill, and protection center coal breakage pipe wall reduces the wearing and tearing of center coal breakage pipe.
Description
Technical Field
The utility model belongs to the technical field of the powder process system, concretely relates to malleation is directly blown formula intermediate speed pulverizer hot-blast bypass device.
Background
The output of the coal mill is divided into three types, namely grinding output, ventilation output and drying output, and in actual operation, the comprehensive output of the coal mill depends on the minimum of the three.
In recent years, due to the shortage of coal resource supply and the rising of carbon price, coal blending is generally adopted as fuel of a coal-fired boiler in order to reduce the power generation cost of the coal-fired power plant in China and deviate from the design of coal types in the process of pulverizing. Lignite, coal slime, sludge and biomass with high total water are often mixed in the mixed coal, so that the drying output of the coal mill is influenced. In order to improve the drying output, coal fired power plant often can improve a hot air volume, can increase the wind speed of nozzle ring department like this, leads to the increase of wind powder mixture velocity of flow, and the coal pulverizer body wearing and tearing aggravation. Therefore, the problem to be solved at present is to introduce more heat into the coal mill without increasing the hot air quantity of the primary hot air chamber of the coal mill, so that the drying time of pulverized coal is shortened, the drying output of the coal mill is improved, and the normal operation of a unit is ensured.
SUMMERY OF THE UTILITY MODEL
For solving the not enough of existence among the prior art, the utility model aims to provide a malleation is directly blown formula coal pulverizer hot air bypass device.
The utility model adopts the following technical proposal:
the utility model provides a hot-blast by-pass device of malleation direct-fired formula coal pulverizer, it includes: the coal feeding device comprises an upper bypass device, a connecting pipeline and a lower bypass device, wherein the upper bypass device and one end of the lower bypass device, which is far away from a central coal dropping pipe, are connected in parallel and are connected with a primary hot air inlet pipe through the connecting pipeline, and hot air is blown into the connecting pipeline from the primary hot air inlet pipe and then blown into the upper bypass device and the lower bypass device; the other ends of the upper bypass device and the lower bypass device are respectively connected with the upper end and the lower end of a central coal dropping pipe in the mill; the upper bypass device can blow air downwards and obliquely downwards, and the lower bypass device can blow air downwards and obliquely upwards.
As a preferred embodiment of the present invention, the connecting pipeline is respectively located at the side of the upper bypass device and the side of the lower bypass device.
As a preferred embodiment of the present invention, the middle section of the connection pipeline is provided with a tee joint, and the tee joint is connected to the upper bypass device, the lower bypass device and the primary hot air inlet pipe respectively.
As a preferred embodiment of the present invention, the upper bypass device and the lower bypass device are both cylindrical structures.
As a preferred embodiment of the present invention, the upper bypass device and the lower bypass device have their central axes located on the same vertical line.
As an embodiment of the present invention, the lower end of the upper bypass device is disposed at the upper end of the central coal dropping pipe in the mill, and the upper end of the lower bypass device is disposed at the lower end of the central coal dropping pipe in the mill.
As a preferred embodiment of the utility model, the top of going up the bypass device sets up and grinds outer coal breakage pipe.
As a preferred embodiment of the present invention, the lower end of the lower bypass device is connected to the powder returning cone through the adjusting seat.
As a preferred embodiment of the present invention, the upper bypass device includes a counter flange, an upper flange, a housing, an inner sleeve, a lower flange, and an upper annular plenum.
As a preferred embodiment of the present invention, the upper end of the housing is welded to the upper flange.
As a preferred embodiment of the present invention, the lower end of the housing is welded to the lower flange.
As a preferred embodiment of the present invention, the diameter of the inner sleeve is smaller than that of the outer shell, and the inner sleeve is sleeved inside the outer shell.
As a preferred embodiment of the utility model, the upper end of endotheca and shell parallel and level, and with last flange welded connection.
As a preferred embodiment of the present invention, an upper annular air chamber is formed between the outer casing and the inner casing.
As a preferred embodiment mode of the utility model, the upper end of going up annular plenum is airtight through last flange, and the lower extreme opens.
As a preferred embodiment of the utility model, the diameter of shell is the same with the diameter that grinds central coal breakage pipe, just the lower extreme of shell passes through lower flange and grinds central coal breakage union coupling.
As a preferred embodiment of the utility model, the diameter of endotheca is the same with the diameter that grinds outer coal breakage pipe, just the upper end of endotheca is connected with the outer coal breakage pipe of mill through anti-flange and last flange.
As a preferred embodiment of the present invention, the length of the inner sleeve is greater than that of the outer shell.
As a preferred embodiment of the present invention, the inner sleeve is provided with a ventilation hole.
As a preferred embodiment mode of the utility model, the central line in ventilation hole is the slant 40 ~ 60 contained angles down with the central line of endotheca.
As a preferred embodiment of the utility model, the lower bypass device comprises an upper coal dropping pipe extension pipe, a lower annular air chamber, an installation adjusting seat and a lower coal dropping pipe extension pipe.
As an embodiment of the present invention, the diameter of the upper coal dropping pipe extension pipe is the same as the diameter of the central coal dropping pipe in the mill, and the upper end of the upper coal dropping pipe extension pipe is connected to the lower end of the central coal dropping pipe in the mill through a conical surface.
As a preferred embodiment mode of the utility model, the middle section of the upper coal dropping pipe extension pipe is provided with a lower annular plenum.
As a preferred embodiment mode of the present invention, the outer diameter of the lower annular plenum is larger than the diameter of the extension pipe of the upper coal dropping pipe.
As a preferred embodiment mode of the utility model, the upper end of lower annular plenum is the type of falling V and welds in the middle part of the last coal breakage pipe extension pipe, and the lower extreme is the type of V and welds with coal breakage pipe extension pipe upper end.
As an embodiment of the present invention, the ventilation hole is provided at the extension pipe of the upper coal chute surrounded by the lower annular plenum.
As a preferred embodiment of the utility model, the central line in ventilation hole and the central line of going up coal breakage pipe extension pipe are the slant and upwards 40 ~ 60 contained angles.
As a preferred embodiment of the utility model, the diameter of coal pipe extension pipe falls is greater than the coal pipe extension pipe that falls, and the lower extreme of going up coal pipe extension pipe stretches into in the coal pipe extension pipe that falls to form annular space.
As a preferred embodiment of the present invention, the mounting adjustment seat includes two connecting plates.
As a preferred embodiment of the utility model, one of them connecting plate welding is at the straight section department of whitewashed awl lower extreme back, and another connecting plate welding is on the coal dropping pipe extension pipe lower extreme pipe wall.
As an embodiment of the utility model discloses a preferred embodiment mode, two connecting plates pass through bolted connection, and can adjust down the relative position that central coal breakage pipe was managed in coal breakage pipe extension pipe and the mill for central coal breakage pipe is concentric in coal breakage pipe extension pipe and the mill.
As an embodiment of the utility model, the house steward of connecting line is provided with a gate valve that plays the shutoff effect on the road, and a butterfly valve that plays the regulation amount of wind size is provided with insulation material outward on the pipeline.
As a preferred embodiment of the present invention, the primary hot air inlet pipe 5 is provided at a lower side portion of the primary hot air bypass device.
As a preferred embodiment of the utility model, the position that once hot-blast entry and once hot-blast bypass device are connected is provided with rotatory nozzle cascade.
Compared with the prior art, the beneficial effects of the utility model reside in that:
the utility model discloses a hot-blast bypass device of malleation direct-blowing formula coal pulverizer simple structure implements the degree of difficulty for a short time, and is less to the transformation of former equipment, does not increase the hot air flow of the wind chamber of coal pulverizer, does not increase nozzle cascade department velocity of flow to do not increase the wearing and tearing of coal pulverizer, do not influence the flow field of the interior wind-powder mixture of mill, and protection center coal breakage pipe wall, reduce the wearing and tearing of center coal breakage pipe.
Drawings
FIG. 1 is a schematic structural diagram of a primary hot air bypass device of a positive pressure direct-blowing coal mill of the present invention;
FIG. 2 is a schematic structural view of an upper bypass device;
FIG. 3 is a schematic view of the construction of the lower bypass device;
FIG. 4 is a schematic view of a ZGM113 coal mill with a static separator;
FIG. 5 shows the practical application of the present invention in the ZGM113 coal mill modification project;
FIG. 6 is an enlarged view of a portion of FIG. 3;
in the figure:
1-an upper bypass device, 2-a connecting pipeline, 3-a lower bypass device, 4-a rotary nozzle ring, 5-a coal mill primary hot air inlet pipe, 6-an inner mill central coal dropping pipe, 7-an outer mill coal dropping pipe, 8-a powder returning cone and 9-a coal mill matched static separator;
101-reverse flange, 102-upper flange, 103-outer shell, 104-inner sleeve, 105-lower flange, 106-upper annular wind chamber;
301-upper coal dropping pipe extension pipe, 302-lower annular air chamber, 303-installation adjusting seat and 304-coal dropping pipe extension pipe.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the drawings in the embodiments of the present invention will be combined below to clearly and completely describe the technical solutions of the present invention. The embodiments described herein are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art without creative efforts will fall within the protection scope of the present invention based on the spirit of the present invention.
Fig. 1 is the utility model discloses a hot-blast by-pass device structural component of malleation direct-fired formula coal pulverizer becomes the schematic diagram, as shown in fig. 1, the utility model discloses a hot-blast by-pass device of malleation direct-fired formula coal pulverizer mainly includes by-pass device 1, connecting line 2 and lower by-pass device 3.
Go up bypass device 1 and bypass device 3 parallelly connected down, and be connected with hot-blast inlet tube 5 once through connecting line 2, hot-blast from hot-blast inlet tube 5 blow in connecting line 2, blow in bypass device 1 and bypass device 3 down afterwards, it is provided with mill center coal breakage pipe 6 down to go up between bypass device 1 and the lower bypass device 3, it can blow downwards and oblique below to go up bypass device 1, lower bypass device 3 can blow downwards and oblique top, make hot-blast center coal breakage pipe 6 formation convection current in milling, the middle section of connecting line 2 is provided with the tee bend, the tee bend is connected to bypass device 1 respectively, bypass device 3 and hot-blast inlet tube 5 once down, the top of going up bypass device 1 sets up mill outer coal breakage pipe 7.
Fig. 2 is a schematic structural diagram of an upper bypass device, and as shown in fig. 2, the upper bypass device 1 includes a counter flange 101, an upper flange 102, an outer housing 103, an inner housing 104, a lower flange 105, and an upper annular plenum 106.
The upper end of the housing 103 is welded to the upper flange 102, and the lower end of the housing 103 is welded to the lower flange 105.
The diameter of the inner sleeve 104 is smaller than that of the outer shell 103, the inner sleeve 104 is sleeved inside the outer shell 103, and the upper end of the inner sleeve 104 is flush with the outer shell 103 and is connected with the upper flange 102 in a welding mode.
An upper annular air chamber 106 is formed between the outer shell 103 and the inner sleeve 104, the upper end of the upper annular air chamber 106 is sealed by the upper flange 102, and the lower end is open.
The diameter of the outer shell 103 is the same as that of the central coal dropping pipe 6 in the mill, the lower end of the outer shell 103 is connected with the central coal dropping pipe 6 in the mill through a lower flange 105, the diameter of the inner sleeve 104 is the same as that of the coal dropping pipe 7 outside the mill, and the upper end of the inner sleeve 104 is connected with the coal dropping pipe 7 outside the mill through a reverse flange 101 and an upper flange 102.
The length of the inner sleeve 104 is greater than the length of the outer shell 103, such that the inner sleeve 104 extends into the milled central coal dropping pipe 6.
The inner sleeve 104 is provided with a vent hole, and the central line of the vent hole and the central line of the inner sleeve 104 form an inclined downward included angle of 40-60 degrees.
Fig. 3 is a schematic structural view of a lower bypass apparatus, fig. 6 is a partially enlarged view of fig. 3, and as shown in fig. 3 and 6, the lower bypass apparatus 3 includes an upper coal drop pipe extension pipe 301, a lower annular plenum 302, a mounting adjustment seat 303, and a coal drop pipe extension pipe 304.
The diameter of the upper coal dropping pipe extension pipe 301 is the same as that of the central coal dropping pipe 6 in the mill, and the upper end of the upper coal dropping pipe extension pipe 301 is connected with the lower end of the central coal dropping pipe 6 in the mill through a conical surface.
The middle section of the upper coal dropping pipe extension pipe 301 is provided with a lower annular air chamber 302, the outer diameter of the lower annular air chamber 302 is larger than the diameter of the upper coal dropping pipe extension pipe 301, the upper end of the lower annular air chamber 302 is in an inverted V shape and is welded with the middle part of the upper coal dropping pipe extension pipe 301, and the lower end of the lower annular air chamber 302 is in a V shape and is welded with the upper end of the lower coal dropping pipe extension pipe 304.
A vent hole is formed in the position, surrounded by the lower annular air chamber 302, of the upper coal dropping pipe extension pipe 301, and the central line of the vent hole and the central line of the upper coal dropping pipe extension pipe 301 form an inclined upward included angle of 40-60 degrees.
The diameter of the coal falling pipe extension pipe 304 is larger than that of the upper coal falling pipe extension pipe 301, and the lower end of the upper coal falling pipe extension pipe 301 extends into the coal falling pipe extension pipe to form an annular space.
The mounting and adjusting seat 303 comprises two connecting plates, one of the connecting plates is welded at the lower end straight section of the dust return cone 8, the other connecting plate is welded on the lower end pipe wall of the coal dropping pipe extension pipe 304, the two connecting plates are connected through bolts, and the relative positions of the coal dropping pipe extension pipe 304 and the central coal dropping pipe 6 in the mill can be adjusted, so that the coal dropping pipe extension pipe 304 and the central coal dropping pipe 6 in the mill are concentric.
The main pipeline of the connecting pipeline 2 is provided with a gate valve for turning off, a butterfly valve for adjusting the air volume, the main pipeline is connected with the two branch pipes through a tee joint, and the pipeline is externally provided with a heat insulation material for reducing heat loss.
A primary hot air inlet 5 is arranged at the lower side part of the primary hot air bypass device, and a rotary nozzle ring 4 is arranged at the position where the primary hot air inlet 5 is connected with the primary hot air bypass device.
Now, further explaining an implemented example of the present invention, fig. 4 is a schematic view of a static separator of a ZGM113 coal mill, and as shown in fig. 4, the coal used for boiler combustion is mixed coal doped with low-quality coal, including coal slime and brown coal with high water content, and is in a powder form. Fig. 5 is the utility model discloses a hot-blast bypass device of malleation direct-blowing formula coal pulverizer reforms transform project practical application at ZGM113 coal pulverizer, will reach the dry hot air volume of exerting oneself the required increase of target and pass through the utility model discloses a device lets in the coal pulverizer, strengthens the drying capacity of coal pulverizer.
Compared with the prior art, the beneficial effects of the utility model reside in that:
the utility model discloses a hot-blast bypass device of malleation direct-blowing formula coal pulverizer simple structure implements the degree of difficulty for a short time, and is less to the transformation of former equipment, does not increase the hot air flow of the wind chamber of coal pulverizer, does not increase nozzle cascade department velocity of flow to do not increase the wearing and tearing of coal pulverizer, do not influence the flow field of the interior wind-powder mixture of mill, and protection center coal breakage pipe wall, reduce the wearing and tearing of center coal breakage pipe.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents of the embodiments of the invention may be made without departing from the spirit and scope of the invention, which should be construed as falling within the scope of the claims of the invention.
Claims (17)
1. The utility model provides a hot-blast by-pass device of malleation direct-fired formula coal pulverizer, it includes: go up bypass device (1), connecting line (2) and bypass device (3) down, its characterized in that:
the upper bypass device (1) and one end, far away from the central coal dropping pipe (6), of the lower bypass device (3) are connected in parallel and are connected with a primary hot air inlet pipe (5) through a connecting pipeline (2), hot air is blown into the connecting pipeline (2) from the primary hot air inlet pipe (5) and then blown into the upper bypass device (1) and the lower bypass device (3);
the other ends of the upper bypass device (1) and the lower bypass device (3) are respectively connected with the upper end and the lower end of a central coal dropping pipe (6) in the mill;
the upper bypass device (1) can blow air downwards and obliquely downwards, and the lower bypass device (3) can blow air downwards and obliquely upwards.
2. The primary hot air bypass device of the positive pressure direct-blowing coal mill as claimed in claim 1, wherein:
the connecting pipeline (2) is respectively positioned on the side surfaces of the upper bypass device (1) and the lower bypass device (3);
a tee joint is arranged at the middle section of the connecting pipeline (2), and is respectively connected to the upper bypass device (1), the lower bypass device (3) and the primary hot air inlet pipe (5);
the upper bypass device (1) and the lower bypass device (3) are both cylindrical structures;
the central axes of the upper bypass device (1) and the lower bypass device (3) are positioned on the same vertical line;
the lower end of the upper bypass device (1) is arranged at the upper end of a central coal dropping pipe (6) in the mill, and the upper end of the lower bypass device (3) is arranged at the lower end of the central coal dropping pipe (6) in the mill;
an outer coal dropping pipe (7) is arranged above the upper bypass device (1);
the lower end of the lower bypass device (3) is connected with the powder return cone (8) through an adjusting seat.
3. The primary hot air bypass device of the positive pressure direct-blowing coal mill according to claim 1, wherein:
the upper bypass device (1) comprises a reverse flange (101), an upper flange (102), an outer shell (103), an inner sleeve (104), a lower flange (105) and an upper annular air chamber (106).
4. The primary hot air bypass device of the positive pressure direct-blowing coal mill according to claim 3, characterized in that:
the upper end part of the shell (103) is connected with the upper flange (102) in a welding way;
the lower end part of the shell (103) is connected with a lower flange (105) in a welding mode.
5. The primary hot air bypass device of the positive pressure direct-blowing coal mill according to claim 4, wherein:
the diameter of the inner sleeve (104) is smaller than that of the outer shell (103), and the inner sleeve (104) is sleeved in the outer shell (103);
the upper end of the inner sleeve (104) is flush with the outer shell (103) and is connected with the upper flange (102) in a welding mode.
6. The primary hot air bypass device of the positive pressure direct-blowing coal mill according to claim 5, wherein:
an upper annular air chamber (106) is formed between the outer shell (103) and the inner sleeve (104);
the upper end of the upper annular air chamber (106) is sealed through an upper flange (102), and the lower end of the upper annular air chamber is open.
7. The primary hot air bypass device of the positive pressure direct-blowing coal mill according to claim 6, wherein:
the diameter of the outer shell (103) is the same as that of the central coal dropping pipe (6) in the mill, and the lower end of the outer shell (103) is connected with the central coal dropping pipe (6) in the mill through a lower flange (105);
the diameter of the inner sleeve (104) is the same as that of the outer coal dropping pipe (7), and the upper end of the inner sleeve (104) is connected with the outer coal dropping pipe (7) through a reverse flange (101) and an upper flange (102).
8. The primary hot air bypass device of the positive pressure direct-blowing coal mill according to claim 7, wherein:
the length of the inner sleeve (104) is larger than that of the outer shell (103).
9. The primary hot air bypass device of the positive pressure direct-blowing coal mill according to claim 5, wherein:
the inner sleeve (104) is provided with a vent hole;
the central line of the vent hole and the central line of the inner sleeve (104) form an inclined downward included angle of 40-60 degrees.
10. The primary hot air bypass device of the positive pressure direct-blowing coal mill according to claim 1, wherein:
the lower bypass device (3) comprises an upper coal dropping pipe extension pipe (301), a lower annular air chamber (302), an installation adjusting seat (303) and a coal dropping pipe extension pipe (304).
11. The primary hot air bypass device of the positive pressure direct-blowing coal mill according to claim 10, wherein:
the diameter of the upper coal dropping pipe extension pipe (301) is the same as that of the central coal dropping pipe (6) in the mill, and the upper end of the upper coal dropping pipe extension pipe (301) is connected with the lower end of the central coal dropping pipe (6) in the mill through a conical surface.
12. The primary hot air bypass device of the positive pressure direct-blowing coal mill according to claim 11, wherein:
a lower annular air chamber (302) is arranged at the middle section of the upper coal dropping pipe extension pipe (301);
the outer diameter of the lower annular air chamber (302) is larger than the diameter of the upper coal dropping pipe extension pipe (301);
the upper end of the lower annular air chamber (302) is inverted V-shaped and is welded with the middle part of the upper coal dropping pipe extension pipe (301), and the lower end of the lower annular air chamber is V-shaped and is welded with the upper end of the lower coal dropping pipe extension pipe (304).
13. The primary hot air bypass device of the positive pressure direct-blowing coal mill as claimed in claim 12, wherein:
a vent hole is formed in the position, surrounded by the lower annular air chamber (302), of the extension pipe (301) of the upper coal dropping pipe;
the central line of the vent hole and the central line of the upper coal dropping pipe extension pipe (301) form an inclined upward included angle of 40-60 degrees.
14. The primary hot air bypass device of the positive pressure direct-fired coal mill according to claim 13, wherein:
the diameter of the coal falling pipe extension pipe (304) is larger than that of the upper coal falling pipe extension pipe (301), and the lower end of the upper coal falling pipe extension pipe (301) extends into the coal falling pipe extension pipe to form an annular space.
15. The primary hot air bypass device of the positive pressure direct-fired coal mill according to claim 14, wherein:
the mounting adjusting seat (303) comprises two connecting plates;
one connecting plate is welded at the straight section at the lower end of the powder returning cone (8), and the other connecting plate is welded on the pipe wall at the lower end of the coal falling pipe extension pipe (304);
the two connecting plates are connected through bolts, and the relative positions of the coal falling pipe extension pipe (304) and the central coal falling pipe (6) in the mill can be adjusted, so that the coal falling pipe extension pipe (304) and the central coal falling pipe (6) in the mill are concentric.
16. The primary hot air bypass device of the positive pressure direct-blowing coal mill according to claim 1, wherein:
a gate valve for turning off and a butterfly valve for adjusting the air volume are arranged on the main pipeline of the connecting pipeline (2), and a heat insulation material is arranged outside the pipeline.
17. The primary hot air bypass device of the positive pressure direct-blowing coal mill according to claim 1, wherein:
the primary hot air inlet pipe (5) is arranged at the lower side part of the primary hot air bypass device;
and a rotary nozzle ring (4) is arranged at the position where the primary hot air inlet pipe (5) is connected with the primary hot air bypass device.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220415383.9U CN217109626U (en) | 2022-02-28 | 2022-02-28 | Positive pressure direct-blowing coal mill primary hot air bypass device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220415383.9U CN217109626U (en) | 2022-02-28 | 2022-02-28 | Positive pressure direct-blowing coal mill primary hot air bypass device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114413274A (en) * | 2022-02-28 | 2022-04-29 | 北京电力设备总厂有限公司 | Primary hot air bypass device of positive-pressure direct-blowing coal mill and use method |
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2022
- 2022-02-28 CN CN202220415383.9U patent/CN217109626U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114413274A (en) * | 2022-02-28 | 2022-04-29 | 北京电力设备总厂有限公司 | Primary hot air bypass device of positive-pressure direct-blowing coal mill and use method |
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