CN102966966A - Large dual-suction three-grinding high pressure impeller coal mill - Google Patents
Large dual-suction three-grinding high pressure impeller coal mill Download PDFInfo
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- CN102966966A CN102966966A CN2012104496825A CN201210449682A CN102966966A CN 102966966 A CN102966966 A CN 102966966A CN 2012104496825 A CN2012104496825 A CN 2012104496825A CN 201210449682 A CN201210449682 A CN 201210449682A CN 102966966 A CN102966966 A CN 102966966A
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Abstract
The invention discloses a large dual-suction three-grinding high pressure impeller coal mill, comprising a seat frame, a shell, a coal hopper, an automatic coal supplying mechanism, a crushing mechanism and a coal injection mechanism, wherein the shell is located on the seat frame; the shell consists of two parts, namely a lower shell and an upper shell; the upper shell and the lower shell are combined to form a three-stage stepped flat cone grinding cavity; the front end of the grinding cavity is linked with the automatic coal supplying mechanism; the other end of the automatic coal supplying mechanism is linked with the coal hopper; the crushing mechanism comprises a main shaft, wheel discs, detachable crushing blades, grinding plates and grinding strips; the wheel discs are fixedly arranged on the main shaft; the detachable crushing blades are fixedly arranged on the wheel discs; the grinding plates are located on the internal surface of the grinding cavity; the grinding strips are located on the grinding plates; the coal injection mechanism comprises a powder collection conical cover, a high pressure impeller cabin, a high pressure impeller and a powder outlet; the high pressure impeller is located in the high pressure impeller cabin; the outer side of the powder collection conical cover and the left outer side of the high pressure impeller cabin form an annular hot air backflow cabin; the hot air backflow cabin is connected with a boiler afterheat hot air backflow pipe; and the boiler afterheat hot air backflow pipe is connected with a heat pipe exchanger. With the large dual-suction three-grinding high pressure impeller coal mill, the structure is compact, the blade wear is small, the coal grinding efficiency is high, the output is great, the heat efficiency of a boiler can be improved, and the large-distance transportation is realized.
Description
Technical field
The invention belongs to the pulverized coal preparation technical field, be specifically related to a kind of large-scale double suction three mill high-pressure impeller coal pulverizers, support the use with boiler combustion system and reach purpose energy-conservation, consumption reduction.
Background technology
Chain furnace is one of ancient mechanism's grate furnace.Because it has the advantages such as simple in structure and easy to operate, chain furnace is widely adopted in China's mediumand smallscale industrial boilers at present, and occupies critical role in the mechanization boiler.Yet chain furnace has certain adaptability to coal.China's ature of coal aboundresources, but ature of coal difference is large, and the variation of ature of coal will make exerting oneself of boiler and decrease in efficiency, especially when combustion heat value is partial to the fuel of lower limit, just must take measures solving
Water, the problem such as deslagging, to improve boiler output and efficient.For improving chain furnace to the adaptability of coal, solution is to adopt chain furnace to add coal dust double-combustion technology and the utilization of boiler afterheat sirocco reclamation preferably.At present, realize that the capital equipment of coal dust firing is by small-sized fans formula coal pulverizer, this kind coal pulverizer is for improving boiler
FirepowerMade contribution with the raising thermal efficiency.But along with continuous fast development economic and society, Industrial Boiler uses and also is tending towards the unit seriation, often an industrial furnace group needs supporting a plurality of coal-grinding and powder-spraying machines, a plurality of small-sized fans formula coal pulverizers are installed, and cost is high, install complicated, need simultaneously longer-distance coal dust to carry (reaching more than the 25m), existing small-sized fans coal pulverizer pulverized coal conveying distance limited (10m is following) can not satisfy existing operating mode demand far away, can not adapt to new market environment.
The flue gas heat recovery of Industrial Boiler, mostly be widely used at large-scale boiler of power plant, but less for middle-size and small-size industrial chain row boiler applications, main cause is that its cost that puts into production is higher, with with the technical scheme of medium small boiler waste heat recovery, so the thermal efficiency of mediumand smallscale industrial boilers is lower, the paces of energy-saving and emission-reduction are slower, and economic benefit is not remarkable.
Be to solve the defective that prior art exists, the present invention seeks to for a kind of compact conformation is provided, blade wear is little, coal-grinding efficient high, output is large, the thermal efficiency that can improve boiler, realize that the large-scale double suction three that large distance is carried grinds the high-pressure impeller coal pulverizers.
Summary of the invention
For achieving the above object, the scheme that the present invention adopts is: these large-scale double suction three mill high-pressure impeller coal pulverizers, comprise mounting, be positioned at the housing on the mounting, coal bunker, automatic coal-feeding mechanism, disintegrating mechanism and coal injection organization, it is characterized in that: described housing is by lower house, upper shell two parts consist of, lower house is fixed on the mounting, upper shell is fixedly connected on the lower house, the flat cone mill chamber of three grades of notch cuttypes that upper-lower casing is combined to form, the front end of mill chamber connects with automatic coal-feeding mechanism, the automatic coal-feeding mechanism other end connects with coal bunker, disintegrating mechanism is positioned at mill chamber, described disintegrating mechanism comprises main shaft, be fixed on the wheel disc on the main shaft, be fixed on the detachable crushing vane on the wheel disc, be positioned at the nog plate and the abrasive stick that is positioned on the nog plate of the inner surface of mill chamber, described wheel disc is three, correspondence is arranged in three grades of mill chambers, and the diameter of the mill chamber at wheel diameter and its place adapts; Described coal injection organization comprises collection powder cone cover, high-pressure impeller storehouse, the high-pressure impeller that is positioned at the high-pressure impeller storehouse and meal outlet, the blade of described high-pressure impeller adopts the manganese steel assembly welding to form, the collection powder cone cover outside and high-pressure impeller storehouse left-external side form the hot air reflux storehouse of annular, the hot air reflux storehouse is connected with boiler residual hot blast return duct, boiler residual hot blast return duct connects heat exchange of heat pipe, on the described meal outlet cylinder that dusts is housed, an end that dusts is provided with the coal dust shower nozzle, and the coal dust shower nozzle is contained in the refractory brickwork of boiler.
Described high pressure blade is arc, and the tangent line angle of this point is 140 ° on the tangent line in its roller dish outer rim exit and the wheel disc.
Described automatic coal-feeding mechanism is provided with the tramp iron separator that is made of permanent magnet.
The present invention has following advantage compared to existing technology:
1, disintegrating mechanism of the present invention adopts three grades of ladders to grind, that is: corase grind-fine grinding-correct grinding grinds fineness of pulverized coal and very evenly can reach more than 200 orders;
2, arc high pressure blade of the present invention is fanned as powder absorption wind, and the existing blower mill of outlet blast improves 50%, so the pulverized coal conveying distance, can reach more than the 25m, satisfies the requirement of large-sized boiler coal supply;
3, described circular hot air backflow storehouse is connected with boiler residual hot blast return duct, boiler residual hot blast return duct connects heat exchange of heat pipe, can be hot blast with boiler afterheat smoke gas flow thermal power transfer, suck the wind powder mixture after grinding in the time of high-pressure impeller heat absorption wind, two strands of air-flows mix in the high-pressure impeller storehouse port of export and the cylinder that dusts fully, reach the function of " double suction three mills " of coal pulverizer, heat exchange of heat pipe conducts heat fast, efficient is high, the hot-air of conversion is tentatively dried the heating coal dust, the initial temperature of coal dust increases substantially, and can save the heat that the part coal dust consumes in stove, is conducive to alleviate coal powder injection to the cooling effect of hot blast, accelerate coal dust firing, make coal dust in the limited time, space internal combustion rate increases substantially, and improves the thermal efficiency 1.5%-4% of boiler, energy-saving and emission-reduction;
4, the present invention arranges tramp iron separator in the mechanism that automatically delivers coal, and can easily remove the hard things such as iron block that are mingled with in the raw coal, has effectively protected equipment, uses safety and reliability;
5, the present invention is because high-pressure impeller has the double suction effect, thereby need not sealing and can stop coal dust and leak, and is conducive to environmental protection.
Description of drawings
Below in conjunction with accompanying drawing specific embodiments of the invention are described in further detail.
Fig. 1 is structural representation of the present invention.
Fig. 2 is high-pressure impeller structural representation of the present invention.
Fig. 3 is that high-pressure impeller A of the present invention is to schematic diagram.
Fig. 4 is the present invention and coal-burning boiler syndeton schematic diagram.
Fig. 5 is Fig. 4 top view.
The specific embodiment
Large-scale double suction three mill high-pressure impeller coal pulverizers as shown in fig. 1, has mounting 1, lower house 3 is housed on mounting 1, main shaft 16 is housed in the lower house, the middle part of main shaft is provided with first order wheel disc 9 successively, second level wheel disc 12, third level wheel disc 14, the outer end of three grades of wheel discs is respectively equipped with the detachable crushing vane 13 of the varying number that intermeshes, and on ring flange 8, ring flange is fixed on the main shaft wheel disc by bolted, separated by the flange spacer, lower house 3 and upper shell 10 corresponding three step cone dishes form three grades of mill storehouses, and three grades of mill storehouse inwalls are provided with the flat cone that 11, three grades of wheel discs of abrasive stick and mill chamber be notch cuttype and arrange.The rear end of body (third level correct grinding level wheel disc right side) is provided with collection powder cone cover 15, the rear end of collection powder cone cover is provided with the high-pressure impeller storehouse, in be provided with high-pressure impeller, described high-pressure impeller is comprised of suction nozzle 18, arc shaped blade 19, high-pressure impeller substrate 20 and high-pressure impeller ring flange 21, collection powder cone cover 15 outsides and high-pressure impeller storehouse left-external side form the hot air reflux storehouse of annular, and the hot air reflux storehouse connects boiler residual hot blast return duct 17.The rear end of main shaft is provided with spindle pulley 22, and mounting 1 is provided with motor 2, and motor pulley 24 is housed on the motor, and driving belt 23 is housed on motor pulley and the spindle pulley.The front end of main shaft is equipped with into coal material receiving port 6, and the material receiving port top has air inlet on the left side end plate of upper shell.On lower house 3 left and right sides bases bearing block 5 is housed respectively, main shaft 16 is installed on the base of lower house 3 by the diaxon bearing.
Fig. 2 and Fig. 3 mesohigh impeller ring flange 21 have high-pressure impeller substrate 20 by rivet, be welded with arc shaped blade 19 on the high-pressure impeller substrate 20, another stupefied of arc shaped blade and 18 welding of high-pressure impeller suction nozzle, the tangent line angle of this point is 140 ° on the tangent line in arc shaped blade 19 roller dish outer rim exits and the wheel disc.
Fig. 4, on coal bunker 26 lower frames frequency control motor 25 is housed in 5, the end of the coal conveying belt mechanism 27 that frequency control motor 25 connects is connected with leads coal bin 30, lead the coal bin end opening and tap into coal material receiving port 6, suspention Deironing mechanism 28 3-5Cm place above coal conveyor structure 27 conveyer belts on the coal bunker 26, the coal-grinding and powder-spraying machine phoenix powder port of export (see figure 1) side of connecing becomes circle interface 31, the Fang Bianyuan interface connects defeated pulverized coal channel 32, defeated pulverized coal channel end connects coal dust shower nozzle 33, the coal dust shower nozzle is installed in the boiler 34 left side refractory brick bodies of wall, termination smoke duster 35 behind the boiler, smoke duster is taken over road 36, the pipeline other end connects heat exchange of heat pipe 37, heat exchange of heat pipe (economizer) upside and left side connect respectively air blast 38 and air-introduced machine 40, side joint hot air reflux pipe 17 under the heat exchange of heat pipe.
Operation principle of the present invention is as follows:
Coal enters reloader structure 27 from coal bunker 26, behind tramp iron separator 28 iron removal by magnetic separation, flow through and lead coal bin 30, advancing coal material receiving port 6 enters in the coal-grinding main frame mill chamber, grind through three grades, coal dust is with the wind spray feed fully burning to boiler 34 combustion chambers under the double suction powder feeding effect of high-pressure impeller, combustion heat flue gas is lower to deduster 35 dedustings by air-introduced machine 40 effects, got rid of by chimney 29 low temperature after entering heat exchange of heat pipe 37 heat exchange, the hot air reflux pipe 17 of flowing through under the dual wind effect at air blast 38 and coal pulverizer high-pressure impeller of the waste heat amount of heat exchange of heat pipe 37 conversion enters in the coal pulverizer hot air reflux storehouse and evenly mixes the preheating coal dust with the coal dust that grinds, the coal dust of preheating to boiler combustion, is reached energy-saving and cost-reducing purpose by the high-pressure impeller spray feed.
Claims (3)
1. one kind large-scale double suction three grinds the high-pressure impeller coal pulverizers, comprise mounting, be positioned at the housing on the mounting, coal bunker, automatic coal-feeding mechanism, disintegrating mechanism and coal injection organization, it is characterized in that: described housing is by lower house, upper shell two parts consist of, lower house is fixed on the mounting, upper shell is fixedly connected on the lower house, the flat cone mill chamber of three grades of notch cuttypes that upper-lower casing is combined to form, the front end of mill chamber connects with automatic coal-feeding mechanism, the automatic coal-feeding mechanism other end connects with coal bunker, disintegrating mechanism is positioned at mill chamber, described disintegrating mechanism comprises main shaft, be fixed on the wheel disc on the main shaft, be fixed on the detachable crushing vane on the wheel disc, be positioned at the nog plate and the abrasive stick that is positioned on the nog plate of the inner surface of mill chamber, described wheel disc is three, correspondence is arranged in three grades of mill chambers, and the diameter of the mill chamber at wheel diameter and its place adapts; Described coal injection organization comprises collection powder cone cover, high-pressure impeller storehouse, the high-pressure impeller that is positioned at the high-pressure impeller storehouse and meal outlet, the blade of described high-pressure impeller adopts the manganese steel assembly welding to form, the collection powder cone cover outside and high-pressure impeller storehouse left-external side form the hot air reflux storehouse of annular, the hot air reflux storehouse is connected with boiler residual hot blast return duct, boiler residual hot blast return duct connects heat exchange of heat pipe, on the described meal outlet cylinder that dusts is housed, an end that dusts is provided with the coal dust shower nozzle, and the coal dust shower nozzle is contained in the refractory brickwork of boiler.
2. large-scale double suction three according to claim 1 grinds the high-pressure impeller coal pulverizers, and it is characterized in that: described high pressure blade is arc, and the tangent line angle of this point is 140 ° on the tangent line in its roller dish outer rim exit and the wheel disc.
3. large-scale double suction according to claim 1 three mill high-pressure impeller coal pulverizers is characterized in that: described automatic coal-feeding mechanism is provided with the tramp iron separator that is made of permanent magnet.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210449682.5A CN102966966B (en) | 2012-11-12 | 2012-11-12 | Large dual-suction three-grinding high pressure impeller coal mill |
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| CN201210449682.5A CN102966966B (en) | 2012-11-12 | 2012-11-12 | Large dual-suction three-grinding high pressure impeller coal mill |
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| CN102966966A true CN102966966A (en) | 2013-03-13 |
| CN102966966B CN102966966B (en) | 2014-11-12 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2074045A (en) * | 1980-04-08 | 1981-10-28 | Ceramica Tecnica Sa | Improvements in solid fuel impeller devices for furnaces |
| CN2186109Y (en) * | 1994-03-26 | 1994-12-28 | 武汉钢铁公司汉阳机械厂 | Pre-hammer fan coal grinding machine |
| CN2251665Y (en) * | 1995-08-02 | 1997-04-09 | 李春甫 | Coal powder burner for boiler |
| CN1170114A (en) * | 1996-06-22 | 1998-01-14 | 兰州振茂实业公司 | Apparatus with characters of high performance coal saving and combustion aid for industrial boilers |
| CN102494348A (en) * | 2011-11-22 | 2012-06-13 | 闵公发 | Energy-saving pulverized coal grinding and delivering equipment for boilers and kilns |
| CN202884959U (en) * | 2012-11-12 | 2013-04-17 | 南阳市亚龙筑路机械制造有限公司 | Big double-suction three-grinding high pressure impeller coal mill |
-
2012
- 2012-11-12 CN CN201210449682.5A patent/CN102966966B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2074045A (en) * | 1980-04-08 | 1981-10-28 | Ceramica Tecnica Sa | Improvements in solid fuel impeller devices for furnaces |
| CN2186109Y (en) * | 1994-03-26 | 1994-12-28 | 武汉钢铁公司汉阳机械厂 | Pre-hammer fan coal grinding machine |
| CN2251665Y (en) * | 1995-08-02 | 1997-04-09 | 李春甫 | Coal powder burner for boiler |
| CN1170114A (en) * | 1996-06-22 | 1998-01-14 | 兰州振茂实业公司 | Apparatus with characters of high performance coal saving and combustion aid for industrial boilers |
| CN102494348A (en) * | 2011-11-22 | 2012-06-13 | 闵公发 | Energy-saving pulverized coal grinding and delivering equipment for boilers and kilns |
| CN202884959U (en) * | 2012-11-12 | 2013-04-17 | 南阳市亚龙筑路机械制造有限公司 | Big double-suction three-grinding high pressure impeller coal mill |
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Effective date of registration: 20210329 Address after: 473000 no.1168 Wolong Road, Wuhou street, Wolong District, Nanyang City, Henan Province Patentee after: Henan Yalong Intelligent Equipment Co.,Ltd. Address before: 473003 No. 1168, Wolong Road, Nanyang, Henan Patentee before: NANYANG YALONG ROAD CONSTRUCTION MACHINERY Co.,Ltd. |
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