CN108443907A - A kind of pulverized coal preparation system and its milling method of medium-speed pulverizer warehouse formula pulverized-coal fired boiler - Google Patents
A kind of pulverized coal preparation system and its milling method of medium-speed pulverizer warehouse formula pulverized-coal fired boiler Download PDFInfo
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- CN108443907A CN108443907A CN201810302241.XA CN201810302241A CN108443907A CN 108443907 A CN108443907 A CN 108443907A CN 201810302241 A CN201810302241 A CN 201810302241A CN 108443907 A CN108443907 A CN 108443907A
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- 239000003245 coal Substances 0.000 title claims abstract description 179
- 238000002360 preparation method Methods 0.000 title claims abstract description 26
- 238000003801 milling Methods 0.000 title claims description 7
- 239000000843 powder Substances 0.000 claims abstract description 114
- 230000007246 mechanism Effects 0.000 claims abstract description 38
- 235000012054 meals Nutrition 0.000 claims abstract description 36
- 238000000227 grinding Methods 0.000 claims abstract description 7
- 239000002817 coal dust Substances 0.000 claims description 39
- 238000000926 separation method Methods 0.000 claims description 7
- 238000012423 maintenance Methods 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 2
- 238000003860 storage Methods 0.000 claims description 2
- 238000005299 abrasion Methods 0.000 abstract description 5
- 230000009471 action Effects 0.000 abstract description 3
- 239000002184 metal Substances 0.000 abstract description 2
- 230000001419 dependent effect Effects 0.000 abstract 1
- 238000002485 combustion reaction Methods 0.000 description 14
- 239000007789 gas Substances 0.000 description 12
- 238000001035 drying Methods 0.000 description 3
- 238000010304 firing Methods 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002802 bituminous coal Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
- F23K3/02—Pneumatic feeding arrangements, i.e. by air blast
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
The invention discloses a kind of pulverized coal preparation systems of medium-speed pulverizer warehouse formula pulverized-coal fired boiler, including feeder structure, the coal pulverizer being connect with the coal outlet of feeder structure, the coal pulverizer wind pushing mechanism being connect with the air inlet of coal pulverizer, stocking mechanism is detached with the fine powder that the meal outlet of coal pulverizer connects and the boiler of the meal outlet connection of stocking mechanism is detached with fine powder, coal pulverizer is medium-speed pulverizer, the powder inlet of pulverized coal bin is connected with row powder fan, the meal outlet of row powder fan connects boiler, the meal outlet of pulverized coal bin is connected with air and powder mixer, the air inlet of air and powder mixer is connected with mixer wind pushing mechanism, the meal outlet of air and powder mixer connects boiler.Medium-speed pulverizer operation power consumption is low, and stage operation meets power grid in different time periods and adjusts needs, and power savings are apparent；Metal consumption is low, and grinding machine abrasion are low, and for the course of work of coal pulverizer based on squeezing action, noise is small；The operating condition of coal pulverizer and being not directly dependent upon for boiler operatiopn, whole equipment and system are reliable.
Description
Technical field
The present invention relates to the pulverized coal preparation system technical fields of pulverized-coal fired boiler, in particular to a kind of medium-speed pulverizer warehouse formula coal dust
The pulverized coal preparation system and its milling method of boiler.
Background technology
In modern thermal power generation unit, the heavy duty boiler overwhelming majority uses suspension firing.Fire coal is through special powder processed
System is milled into fine powder, and specific surface area greatly increases, and boiler combustion efficiency can be improved to 99% or more, therefore it provides qualified
Coal dust it is most important.
Recommend to select low speed coal mill warehouse formula and medium-speed pulverizer direct-firing typically for the pulverized-coal fired boiler for using bituminous coal
Two kinds of pulverized coal preparation systems.Being mainly characterized by for low speed coal mill warehouse formula pulverized coal preparation system is ground qualified coal dust by low speed coal mill
It is all stored in pulverized coal bin, is then used by fuel quantity supply boiler combustion needed for boiler through pulverizer coal feeder.The operating mode of coal pulverizer
Direct relation between boiler operatiopn is little, ensure that the reliability of whole equipment and system.Low speed coal mill equipment is huge, electricity
Consumption is high, and abrasion are big, high noise when operation.
In the direct-firing system of medium-speed pulverizer, the qualified coal dust that grinds all is sent directly into burning in boiler, boiler operatiopn with
The work of coal pulverizer is closely bound up, the coal-air ratio in pulverized coal preparation system must satisfy coal pulverizer itself aerodynamic characteristics require and
The demand of raw coal drying, it is necessary to keep the reliability of coal dust Geldart-D particle and adapt to requirement of the boiler combustion to First air.Middling speed
The coal dust preparation system of mill is simple, and power consumption is low, and abrasion are small, but the pulverized coal preparation system leakage powder of operation under positive pressure is serious, and repair and maintenance amount is big,
Every boiler is both needed to a spare coal pulverizer.
Patent No. " CN204611813U ", title are the special of " the multi-functional powder feed system of warehouse formula among low speed coal mill "
A kind of Mill Systems are disclosed in profit, although the system carries out pump drainage by row powder fan to the leakage powder of pulverized-coal collector,
Since the coal dust fineness of low speed coal mill production is not high, the coal dust of pump drainage is needed to regrind by coal pulverizer or be mixed with wind powder
Hearth combustion could be entered after coal dust mixing in clutch, the course of work is complicated, and efficiency of combustion is low, and boiler heat supplying is slow.And it is of the invention
Using medium-speed pulverizer as coal-grinding basis, though leakage powder is more, coal dust fineness is high, and leakage powder is solved the problems, such as simultaneously by row powder fan
It is sent directly into hearth combustion, the lack of gas notch setting for leaking powder is square on the burner, when coal dust falls to burner height, coal
Powder reaches maximum with air contact area, ensures that burner fully burns to it, is also improved while improving efficiency of combustion
The heating efficiency of boiler, simplifies structure.
Invention content
Present invention aim to solve the deficiency of above-mentioned background technology, provide that a kind of power consumption is low, abrasion are small, powder processed effect
The pulverized coal preparation system and its milling method of the high medium-speed pulverizer warehouse formula pulverized-coal fired boiler of rate.
In order to achieve this, the pulverized coal preparation system of the medium-speed pulverizer warehouse formula pulverized-coal fired boiler designed by the present invention, including mill
Coal machine detaches storage with the coal pulverizer wind pushing mechanism of the air inlet of coal pulverizer connection, the coal dust connected with the meal outlet of coal pulverizer
Mechanism, the meal outlet powder feeding mechanism connected that stocking mechanism is detached with coal dust and the boiler being connect with the meal outlet of powder feeding mechanism,
It is characterized in that：The coal pulverizer is medium-speed pulverizer, and the powder inlet of the coal dust separation stocking mechanism is connected with row powder fan,
The lack of gas spout of the meal outlet connection boiler of the row powder fan, the powder feeding mechanism includes connecting with the meal outlet of the pulverized coal bin
The air inlet of the air and powder mixer connect, the air and powder mixer is connected with mixer wind pushing mechanism, and the air and powder mixer goes out
Powder mouth connects the burner of boiler, and the lack of gas spout is located at the top of burner.
Specifically, the coal pulverizer wind pushing mechanism include the air inlet that one end is connected to coal pulverizer the first cool air hose and
First hot blast pipe, the other end of first hot blast pipe connect the air preheater in boiler tail vertical shaft.
Specifically, coal dust separation stocking mechanism include the pulverized-coal collector being connect with the meal outlet of coal pulverizer and with it is thin
The pulverized coal bin of the meal outlet connection of powder separator；The meal outlet of the coal pulverizer and the powder inlet of row powder fan are detached with fine powder
Device connects.
Specifically, the mixer wind pushing mechanism includes one end is connected on the first hot blast pipe, other end connection wind powder is mixed
The second hot blast pipe and one end of the air inlet of clutch are connected on the second hot blast pipe, the other end connects the second cold wind of pressure fan
The air outlet of pipe, the pressure fan connects air preheater by ajutage, and the other end of second cool air hose, which is connected to, to be sent
On air hose.
Further, it is connected with recirculation conduit between the meal outlet of the row powder fan and the air inlet of coal pulverizer.
Further, tertiary air pipeline, institute are connected between the meal outlet of the row powder fan and the lack of gas spout of boiler
The air inlet of one end connection coal pulverizer of recirculation conduit is stated, the other end is connected on tertiary air pipeline.
Further, it is connected with a wind pipe between the meal outlet of the air and powder mixer and the burner of boiler.
Further, secondary air duct, the end connection of the secondary air duct are connected on first hot blast pipe
The burner of boiler.
Specifically, the coal pulverizer is connected with feeder structure, the feeder structure includes crusher, and the crusher goes out
Coal mouth is connected with feeder, the coal feed point of the coal outlet connection coal pulverizer of the feeder.
The milling method of the pulverized coal preparation system of medium-speed pulverizer warehouse formula pulverized-coal fired boiler is：Coal pulverizer plays mill by the coal dust of milled
It is sent into pulverized-coal collector, row powder fan carries out pump drainage, the coal after pulverized-coal collector detaches to the leakage powder in pulverized-coal collector
Powder sequentially enters in pulverized coal bin and air and powder mixer, and the coal dust in air and powder mixer is sent into boiler by mixer wind pushing mechanism
Burner in burn, row powder fan will leak powder pump drainage and be sprayed outward into boiler and by lack of gas spout, when leakage powder is fallen to
Pass through burner combustion when the height of burner.
When pulverized coal bin is bought securities with all one's capital or when coal pulverizer maintenance down, row powder fan is closed, it is mixed that coal dust from pulverized coal bin falls to wind powder
In clutch, coal dust in air and powder mixer is sent into boiler by mixer wind pushing mechanism and is burnt, wait for pulverized coal bin can continue into
After powder or coal-grinding machine overhauling, coal pulverizer and row powder fan are restarted.
The beneficial effects of the invention are as follows：1, low using medium-speed pulverizer operation power consumption, stage operation meets different time
The power grid of section, which is adjusted, to be needed, and power savings are apparent；2, metal consumption is low, grinding machine abrasion it is low, only the ten of low speed coal mill/
One；3, for the course of work of coal pulverizer based on squeezing action, noise is small；4, the operating condition of coal pulverizer and boiler operatiopn does not have
Direct relation, whole equipment and system are reliable；5, simple system is not necessarily to a spare coal pulverizer.Since whole system only has one
Platform coal pulverizer, stage operation coal pulverizer stop time consuming can fully meet maintenance needs.Whole system is set using closed
Meter, without being emptied after adding dedusting, meets environmental requirement, while improving coal utilization.
Description of the drawings
Fig. 1 is the schematic diagram of the pulverized coal preparation system designed by the present invention；
Wherein, 1-crusher, 2-feeders, 3-coal pulverizers, 4-pulverized-coal collectors, 5-pulverized coal bins, 6-row's powder wind
Machine, 7-air and powder mixers, 8-boilers, 9-lack of gas spouts, 10-tertiary air pipelines, 11-a wind pipes, 12-Secondary Airs
Pipeline, 13-burners, 14-air preheaters, 15-pressure fan, the 16-the first cool air hose, the 17-the first hot blast pipe, 18-
Recirculation conduit, the 19-the second cool air hose, the 20-the second hot blast pipe, 21-ajutages.
Specific implementation mode
The following further describes the present invention in detail with reference to the accompanying drawings and specific embodiments.
The pulverized coal preparation system of medium-speed pulverizer warehouse formula pulverized-coal fired boiler as shown in Figure 1, including feeder structure and feeder structure
Coal outlet connection coal pulverizer 3, connect with the air inlet of coal pulverizer 3 coal pulverizer wind pushing mechanism, and coal pulverizer 3 meal outlet
The fine powder of connection detaches stocking mechanism and detaches the boiler 8 of the meal outlet connection of stocking mechanism with fine powder, and feeder structure includes broken
The coal outlet of broken machine 1, crusher 1 is connected with feeder 2, the coal feed point of the coal outlet connection coal pulverizer 3 of feeder 2.Fine powder point
Include the pulverized-coal collector 4 being connect with the meal outlet of coal pulverizer 3 from stocking mechanism and is connect with the meal outlet of pulverized-coal collector 4
Pulverized coal bin 5, coal pulverizer 3 are medium-speed pulverizer, and the powder inlet of pulverized-coal collector 4 is also associated with row powder fan 6, row powder fan 6
Meal outlet connects boiler 8, and the meal outlet of pulverized coal bin 5 is connected with air and powder mixer 7, and the air inlet of air and powder mixer 7 is connected with mixed
The meal outlet of clutch wind pushing mechanism, air and powder mixer 7 connects boiler 8.Coal pulverizer wind pushing mechanism includes that one end is connected to coal pulverizer 3
Air inlet the first cool air hose 16 and the first hot blast pipe 17, the other end of the first hot blast pipe 17 connects 8 tail vertical well of boiler
Interior air preheater 14.Mixer wind pushing mechanism includes that one end is connected on the first hot blast pipe 17, other end connection wind powder mixes
The second hot blast pipe 20 and one end of the air inlet of clutch 7 are connected on the second hot blast pipe 20, the other end connects the of pressure fan 15
The air outlet of two cool air hoses 19, pressure fan 15 connects air preheater 14, the other end of the second cool air hose 19 by ajutage 21
It is connected on ajutage 21.It is connected with recirculation conduit 18 between the meal outlet and the air inlet of coal pulverizer 3 of row powder fan 6.Row
Tertiary air pipeline 10 is connected between the meal outlet of powder wind turbine 6 and the lack of gas spout 9 of boiler 8, lack of gas spout 9 is located at boiler 8
The top of burner 13.The air inlet of one end connection coal pulverizer 3 of recirculation conduit 18, the other end are connected to tertiary air pipeline 10
On.It is connected with a wind pipe 11 between the meal outlet of air and powder mixer 7 and the burner 13 of boiler 8.On first hot blast pipe 17
It is connected with secondary air duct 12, the burner 13 of the end connection boiler 8 of secondary air duct 12.
Crusher 1, feeder 2, coal pulverizer 3, pulverized-coal collector 4, pulverized coal bin 5, row powder fan 6, air and powder mixer 7 and pot
Stove 8 is existing apparatus, and above-mentioned apparatus is attached by the present invention, and reasonable Arrangement is new boiler combustion system.
Pulverized coal preparation system designed by the present invention carries out powder processed using a medium-speed pulverizer, and coal dust first passes through at crusher 1
Medium-speed pulverizer is sent by feeder 2 after reason.When opening mill, the drier needed for medium-speed pulverizer is added by the first hot air duct 17
First cold air duct 16 mixes, and the first hot air duct 17, which is connected to, to be arranged in the air preheater 14 of 8 tail vertical well of boiler and go out
One's intention as revealed in what one says road, the first cold air duct 16 are connected to the entrance of coal pulverizer 3.Coal dust is after drying, grinding, and qualified pulverized coal borne air flow is through middling speed
The outlet of coal pulverizer enters pulverized-coal collector 4 and carries out secondary separation, and most of coal dust enters pulverized coal bin 5, gas containing powder after separation
Stream is by the way that after row powder fan 6, a part is used as drying by recirculation conduit 18 as recycling lack of gas into medium-speed pulverizer
Agent, another part are burnt by tertiary air pipeline 10 into burner 13 as tertiary air.5 lower disposed of pulverized coal bin has wind
Powder mixer 7, the cold wind sent by the second hot blast pipe 20 and from pressure fan 15 by another part hot wind is through the second cool air hose 19
After being mixed into warm air, by air and powder mixer 7 carry out powder feeding, as First air by a wind pipe 11 enter burner 13 into
Row burning.Part III hot wind carries out air distribution as Secondary Air by being directly entered burner 13 by secondary air duct 12, full
The oxygen amount that coal dust after burning in sufficient boiler 8 needs.Ensureing that boiler 8 burns required fineness of pulverized coal, coal pulverizer 3
Nominal output be about 1.5~2 times boiler oil consumption.Under the action of row powder fan 6, it is ensured that coal pulverizer 3 and
It is negative pressure in powder feed system, no leakage powder.
It carries out stopping mill operation after the coal dust in pulverized coal bin 5 reaches limit level, row powder fan 6 is stopped transport, the first cool air hose
16, the valve on the first hot blast pipe 17 and recirculation conduit 18 is turned off, and is led to by a part of hot wind that air preheater 14 is sent
It crosses the second hot blast pipe 20 and from the cold wind that pressure fan 15 is sent after the second cool air hose 19 is mixed into warm air, passes through air and powder mixer
7 carry out powder feeding, are burnt into burner 13 by a wind pipe 11 as First air.Another part hot wind is as secondary
Wind carries out air distribution by being directly entered burner 13 by secondary air duct 12, meets the coal dust after burning needs in boiler 8
Oxygen amount.
In the present invention, the medium-speed pulverizer that coal pulverizer 3 selects rated power to be more than boiler combustion consumption carries out coal-grinding behaviour
Make, the leakage powder generated by medium-speed pulverizer can be directly entered burning in boiler 8, and to ensure efficiency of combustion, lack of gas spout 9 is arranged
Above burner 13, the coal dust and the air contact area in boiler 8 sprayed from lack of gas spout 9 is maximum, when coal dust is fallen to
When the height of burner 13, burner 13 can fully burn to coal dust, has been effectively ensured from coal pulverizer 3 and has been directly entered boiler
Combustion Efficiency of Coal Powder in 8.Since the rated power of coal pulverizer 3 is more than boiler combustion consumption, when coal pulverizer 3 shuts down inspection
When repairing, the coal dust in pulverized coal bin 5 can be sent into boiler 8 by air and powder mixer 7 and mixer wind pushing mechanism and burnt, wait for coal pulverizer
After 3 maintenance, restarting can supplement the coal dust of pulverized coal bin 5, the highest powder processed of realization system and efficiency of combustion.Manually
The downtime of coal pulverizer 3, cost of making rational planning for, highly practical, good economy performance may be selected.
The above described is only a preferred embodiment of the present invention, not being done in any form to the structure of the present invention
Limitation.It is every according to the technical essence of the invention to any simple modification, equivalent change and modification made by above example,
In the range of still falling within technical scheme of the present invention.
Claims (10)
1. a kind of pulverized coal preparation system of medium-speed pulverizer warehouse formula pulverized-coal fired boiler, including coal pulverizer (3), the air inlet with coal pulverizer (3)
The coal pulverizer wind pushing mechanism of mouth connection detaches stocking mechanism with the coal dust that the meal outlet of coal pulverizer (3) connects, detaches storage with coal dust
The boiler (8) deposited the powder feeding mechanism of the meal outlet connection of mechanism and connect with the meal outlet of powder feeding mechanism, it is characterised in that：It is described
Coal pulverizer (3) is medium-speed pulverizer, and the powder inlet of the coal dust separation stocking mechanism is connected with row powder fan (6), row's powder
The lack of gas spout (9) of the meal outlet connection boiler (8) of wind turbine (6), the powder feeding mechanism include going out powder with the pulverized coal bin (5)
The air and powder mixer (7) of mouth connection, the air inlet of the air and powder mixer (7) are connected with mixer wind pushing mechanism, the wind powder
The burner (13) of the meal outlet connection boiler (8) of mixer (7), the lack of gas spout (9) are located at the top of burner (13).
2. the pulverized coal preparation system of medium-speed pulverizer warehouse formula pulverized-coal fired boiler as described in claim 1, it is characterised in that：The coal-grinding
Machine wind pushing mechanism includes the first cool air hose (16) and the first hot blast pipe (17) for the air inlet that one end is connected to coal pulverizer (3),
Air preheater (14) in other end connection boiler (8) tail vertical well of first hot blast pipe (17).
3. the pulverized coal preparation system of medium-speed pulverizer warehouse formula pulverized-coal fired boiler as described in claim 1, it is characterised in that：The coal dust
Separation stocking mechanism includes the pulverized-coal collector (4) that is connect with the meal outlet of coal pulverizer (3) and goes out powder with pulverized-coal collector (4)
The pulverized coal bin (5) of mouth connection；
The meal outlet of the coal pulverizer (3) and the powder inlet of row powder fan (6) are connect with pulverized-coal collector (4).
4. the pulverized coal preparation system of medium-speed pulverizer warehouse formula pulverized-coal fired boiler as claimed in claim 2, it is characterised in that：The mixing
Device wind pushing mechanism include one end be connected on the first hot blast pipe (17), the air inlet of other end connection air and powder mixer (7) the
Two hot blast pipes (20) are connected to one end on the second hot blast pipe (20), the other end connects the second cool air hose of pressure fan (15)
(19), the air outlet of the pressure fan (15) connects air preheater (14), second cool air hose by ajutage (21)
(19) the other end is connected on ajutage (21).
5. the pulverized coal preparation system of medium-speed pulverizer warehouse formula pulverized-coal fired boiler as described in claim 1, it is characterised in that：Row's powder
It is connected with recirculation conduit (18) between the meal outlet and the air inlet of coal pulverizer (3) of wind turbine (6).
6. the pulverized coal preparation system of medium-speed pulverizer warehouse formula pulverized-coal fired boiler as claimed in claim 5, it is characterised in that：Row's powder
It is connected with tertiary air pipeline (10), the recirculation conduit between the meal outlet of wind turbine (6) and the lack of gas spout (9) of boiler (8)
(18) air inlet of one end connection coal pulverizer (3), the other end are connected on tertiary air pipeline (10).
7. the pulverized coal preparation system of medium-speed pulverizer warehouse formula pulverized-coal fired boiler as described in claim 1, it is characterised in that：The wind powder
It is connected with a wind pipe (11) between the meal outlet of mixer (7) and the burner (13) of boiler (8).
8. the pulverized coal preparation system of medium-speed pulverizer warehouse formula pulverized-coal fired boiler as claimed in claim 2, it is characterised in that：Described first
Secondary air duct (12), the burner of the end connection boiler (8) of the secondary air duct (12) are connected on hot blast pipe (17)
(13)。
9. a kind of milling method of the pulverized coal preparation system of medium-speed pulverizer warehouse formula pulverized-coal fired boiler as described in claim 1, special
Sign is：Coal pulverizer (3) plays mill and the coal dust of milled is sent into pulverized-coal collector (4), and row powder fan (6) is to pulverized-coal collector
(4) the leakage powder in carries out pump drainage, and the coal dust after pulverized-coal collector (4) separation sequentially enters pulverized coal bin (5) and air and powder mixer
(7) in, the coal dust in air and powder mixer (7) is sent by burning in the burner (13) of boiler (8) by mixer wind pushing mechanism,
Row powder fan (6) will leak powder pump drainage and be sprayed outward into boiler (8) and by lack of gas spout (9), when leakage powder falls to burner
(13) pass through burner (13) when height to burn.
10. the milling method of the pulverized coal preparation system of medium-speed pulverizer warehouse formula pulverized-coal fired boiler as claimed in claim 9, feature exist
In：When pulverized coal bin (5) is bought securities with all one's capital or when coal pulverizer (3) maintenance down, closes row powder fan (6), coal dust is fallen to from pulverized coal bin (5)
In air and powder mixer (7), the coal dust in air and powder mixer (7) is sent by burning in boiler (8) by mixer wind pushing mechanism, is waited for
Pulverized coal bin (5) can continue after being overhauled into powder or coal pulverizer (3), restarting coal pulverizer (3) and row powder fan (6).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114353059A (en) * | 2022-01-21 | 2022-04-15 | 清华大学 | Extremely narrow screening particle size fine coal circulating fluidized bed combustion system |
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| CN101761933A (en) * | 2010-01-15 | 2010-06-30 | 西安热工研究院有限公司 | Low-temperature furnace smoke sucking exhaust gas and hot air drying composite powder feeding bituminous coal and meagre coal universal type powder preparing system |
| CN102840593A (en) * | 2011-06-20 | 2012-12-26 | 上海机易电站设备有限公司 | Fume dried lignite medium speed mill powder-making system |
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