CN103769274B - A kind of coal pulverizer - Google Patents
A kind of coal pulverizer Download PDFInfo
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- CN103769274B CN103769274B CN201410057370.9A CN201410057370A CN103769274B CN 103769274 B CN103769274 B CN 103769274B CN 201410057370 A CN201410057370 A CN 201410057370A CN 103769274 B CN103769274 B CN 103769274B
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Abstract
A kind of coal pulverizer, comprise lapping device, described lapping device comprises grinding roller assembly and mill assembly, described grinding roller assembly comprises grinding roller and grinding roller roller shell, described mill assembly is provided with liner plate, it is characterized in that: the width of described grinding roller roller shell at least increases by 6% to 8% on the original basis, and its cornerite at least reduces 18% to 20% on the original basis, described liner plate cornerite at least reduces 16% to 18% on the original basis, and its arc radius at least increases 23% to 25% on the original basis.The present invention's beneficial effect is compared with prior art: on the basis of conventional type ZGM medium-speed pulverizer, by optimizing the technological improvement of the aspects such as grinding molded line, nozzle ring structure, rotary separator structure, hydraulic loading device, change the grinding of ZGM medium-speed pulverizer and separate targets, meet ZGM roller ring mill completely and grind coarse granule coal dust (D
50=0.4 ~ 0.5mm) fragmentation, grinding, drying, separation needs.
Description
Technical field
The present invention relates to coal pulverizer, particularly relating to a kind of ZGM coal pulverizer for grinding coarse granule coal dust.
Background technology
Technology of Circulating Fluidized Bed Boiler is the high-efficiency low-pollution clean burning branch art developed rapidly in recent ten years.This technology has obtained business application widely in fields such as station boiler, Industrial Boiler and offal treatment utilizations in the world, and develops to the large circulating fluidized bed boiler of hundreds of thousands multikilowatt scale; Domestic research in this respect, development and application are also risen gradually, among existing up to a hundred CFBBs put into operation or manufacturing.Following several years will be an important period of recirculating fluidized bed develop rapidly.The size distribution profile of recirculating fluidized bed to fuel is higher, and coal dust too slightly or too carefully all can produce harmful effect to boiler.The domestic fuel crushing for fluidized-bed combustion boiler is also in the stage of fumbling, has the precedent using blower mill.But blower mill shock plate quick abrasion, the life-span is low, overhauls frequently and also have impact on boiler efficiency.Roller ring mill is the matured product of market application, is mainly used in grinding bituminous coal and anthracite, preparation D
50be the coal dust of 0.04 ~ 0.07mm, conventional coal-air ratio, between 2 ~ 3, is also not enough to grind coarse granule coal dust, in order to meet the requirement of fluidized-bed combustion boiler fuel, and the technological improvement need carrying out for grinding coarse granule coal dust to roller ring mill.
The patent No. is that the Chinese invention patent of ZL201210495087.5 discloses a kind of roller ring mill, comprise support, casing, milling device, power is supplied to liner plate with the power supply making lining plate rotary rotate and transmission device, grinding roller for milling device provides the charger of loading force, ventilation unit, be separated, coal powder distributor case, slag-draining device and explosion-proof steam pipework, wherein nozzle ring comprises: bull ring pallet, be fixedly connected on power supply and transmission device and can rotate under the drive of power supply and transmission device and liner plate is fixedly embedded in bull ring pallet, nozzle stationary ring, is fixedly connected on casing, nozzle rotating ring, is fixedly connected on bull ring pallet and arranges and its periphery is provided with rotating ring blade at a distance of certain interval with nozzle stationary ring, wear strip, is arranged at a side of nozzle stationary ring relative nozzle rotating ring, and pressure aerofoil, be arranged at rotating ring blade place, for controlling the flow velocity of the drying medium by rotating ring blade.Adopt the coal pulverizer of this application, improve roller ring mill structure and then enhance product performance.But this invention does not carry out technological improvement for grinding coarse granule coal dust, is not therefore suitable for and grinds coarse granule coal dust.
The patent No. is that the Chinese utility model patent of ZL200420068000.7 discloses a kind of roller medium speed coal mill, is made up of motor, reductor, mill, grinding roller, pressue device, separator, coal spout etc.It is characterized in that: be equiped with above mill and between each grinding roller and raise nozzle by blowing, coal dust that warm-air pipe, adjustment doors form blows and raise device; In the bottom of separator and coal spout, time powder separator again that powder sends out plate, triangle spiral board, zigzag annular plate composition is housed back; Top between shell and separator is equiped with axial adjustment baffle plate.Be characterized in: pulverizer capacity can be improved, reduce resistance, reduce the coal-grinding of coal pulverizer and conveying power consumption, also improve the ability wide to ature of coal water adaptability.But this utility model does not carry out the technological improvement for grinding coarse granule coal dust equally, is not therefore suitable for yet and grinds coarse granule coal dust.
Summary of the invention
Be not suitable in order to what solve that ZGM medium-speed pulverizer in above-mentioned prior art exists the technological deficiency grinding coarse granule coal dust, the technical solution used in the present invention is as follows:
A kind of coal pulverizer, comprise lapping device, described lapping device comprises grinding roller assembly and mill assembly, described grinding roller assembly comprises grinding roller and grinding roller roller shell, described mill assembly is provided with liner plate, wherein: the width of described grinding roller roller shell at least increases by 6% to 8% on the original basis, and its cornerite at least reduces 18% to 20% on the original basis, described liner plate cornerite at least reduces 16% to 18% on the original basis, and its arc radius at least increases 23% to 25% on the original basis.
Preferably, described grinding roller roller case material adopts Cr2021.
In above-mentioned either a program preferably, described lining material adopts Cr2021.
In above-mentioned either a program preferably, also loading system is comprised.
In above-mentioned either a program preferably, described loading system adopts hydraulic variable loading system.
In above-mentioned either a program preferably, described hydraulic variable loading system is provided with at least two cover proportional pressure control valve oil piping systems.
In above-mentioned either a program preferably, the pressure rating of described proportional pressure control valve oil piping system is at least 15MPa.
In above-mentioned either a program preferably, the pressure adjusting scope of described proportional pressure control valve oil piping system is 0 ~ 15MPa.
In above-mentioned either a program preferably, described hydraulic variable loading system comprises oil cylinder.
In above-mentioned either a program preferably, described oil cylinder increases bore size on the original basis.
In above-mentioned either a program preferably, described oil cylinder comprises rodless cavity.
In above-mentioned either a program preferably, described rodless cavity one end is provided with back pressure system.
In above-mentioned either a program preferably, described rodless cavity one end is also provided with accumulator.
In above-mentioned either a program preferably, described mill assembly comprises nozzle ring.
In above-mentioned either a program preferably, described nozzle ring comprises nozzle rotating ring and nozzle stationary ring.
In above-mentioned either a program preferably, described nozzle rotating ring adopts welding rotating ring.
In above-mentioned either a program preferably, casing is comprised.
In above-mentioned either a program preferably, described casing is installed with nozzle stationary ring.
In above-mentioned either a program preferably, described nozzle stationary ring adopts welding stationary ring.
In above-mentioned either a program preferably, high-abrasive material is welded with in described nozzle stationary ring.
In above-mentioned either a program preferably, described mill assembly comprises bull ring pallet.
In above-mentioned either a program preferably, described nozzle rotating ring is connected by bolt with bull ring pallet.
In above-mentioned either a program preferably, described nozzle rotating ring is provided with nozzle rotating ring blade.
In above-mentioned either a program preferably, described nozzle rotating ring blade material adopts 16Mn.
In above-mentioned either a program preferably, described nozzle rotating ring blade quantity is at least 42.
In above-mentioned either a program preferably, rotary separator is comprised.
In above-mentioned either a program preferably, described rotary separator adopts dynamic rotary separator.
In above-mentioned either a program preferably, described rotary separator comprises rotor.
In above-mentioned either a program preferably, the range of speeds of described rotor is 0 ~ 70r/min.
In above-mentioned either a program preferably, described rotary separator comprises shell separator.
In above-mentioned either a program preferably, described shell separator height is reduced on the original basis.
The present invention's beneficial effect is compared with prior art: on the basis of conventional type ZGM medium-speed pulverizer, by optimizing the technological improvement of the aspects such as grinding molded line, nozzle ring structure, rotary separator structure, hydraulic loading device, change the grinding of ZGM medium-speed pulverizer and separate targets, meet ZGM roller ring mill completely and grind coarse granule coal dust (D
50=0.4 ~ 0.5mm) fragmentation, grinding, drying, separation needs.Grinding molded line of the present invention adopts the form of wide-wheel grinding roller, flat liner plate; Nozzle ring adopts Type of Welding, increases ventilation, adapts to the large coal-air ratio that coarse granule requires; Rotary separator adopts single rotor form, improves blade dimensions and angle, is more conducive to coarse grained separation; Charger is provided with back pressure system, makes loading force more stable and accurate, reduces vibration.
Accompanying drawing explanation
Fig. 1 is the contour structures schematic diagram according to coal pulverizer one preferred embodiment of the present invention;
Fig. 2 is the lapping device embodiment illustrated in fig. 1 of coal pulverizer of the present invention and the structural representation of nozzle ring;
Fig. 3 is the contour structures schematic diagram of the dynamic rotary separator embodiment illustrated in fig. 1 of coal pulverizer of the present invention;
Fig. 4 is the back pressure system schematic diagram embodiment illustrated in fig. 1 of coal pulverizer of the present invention;
Description of reference numerals:
1 hydraulic variable loading system; 2 rotary separators; 3 grinding roller assemblies; 4 mill assemblies; 5 nozzle rings; 6 welding stationary rings; 7 welding rotating rings; 8 grinding roller roller shells; 9 liner plates; 10 loading motors; 11 load pump; 12 check valve A; 13 check valve B; 14 filter A; 15 filter B; 16 pressure transmitter A; 17 pressure transmitter B; 18 Pressure gauge A; 19 Pressure gauge B; 20 accumulator A; 21 proportional pressure control valve A; 22 reaction machines; 23 reaction pumps; 24 accumulator B; 25 proportional pressure control valve B; 26 load cylinder A; 27 load cylinder B; 28 load cylinder C; 29 coolers; 30 thermometers; 31 thermal resistances; 32 air filters; 33 heaters; 34 liquid level gauges; 35 fuel tanks; 36 terminal boxs; 37 stop valves.
Detailed description of the invention
In order to understand the present invention better, below in conjunction with specific embodiment, the present invention is explained in detail, but, obviously can carry out different modification and remodeling to the present invention and not exceed the wider spirit and scope of the present invention of appended claims.Therefore, following examples have exemplary and hard-core implication.
As Figure 1-4, a kind of coal pulverizer, comprise lapping device, described lapping device comprises grinding roller assembly 3 and mill assembly 4, described grinding roller assembly 3 comprises grinding roller and grinding roller roller shell 8, described mill assembly 4 is provided with liner plate 9, wherein: the width of described grinding roller roller shell 8 at least increases by 6% to 8% on the original basis, its cornerite at least reduces 18% to 20% on the original basis, described liner plate 9 cornerite at least reduces 16% to 18% on the original basis, its arc radius at least increases 23% to 25% on the original basis, grinding roller roller shell 8 and liner plate 9 material adopt Cr2021, also comprise loading system, described loading system adopts hydraulic variable loading system 1, hydraulic variable loading system 1 is provided with at least two cover proportional pressure control valve oil piping systems, the pressure rating of described proportional pressure control valve oil piping system is at least 15MPa, pressure adjusting scope is 0 ~ 15MPa, hydraulic variable loading system 1 comprises oil cylinder, described oil cylinder increases bore size on the original basis, described oil cylinder comprises rodless cavity, described rodless cavity one end is provided with back pressure system and accumulator, mill assembly 4 comprises nozzle ring 5, nozzle ring 5 comprises nozzle rotating ring and nozzle stationary ring, described nozzle rotating ring adopts welding rotating ring 7, comprise casing, casing is installed with nozzle stationary ring, described nozzle stationary ring adopts welding stationary ring 6, high-abrasive material is welded with in described nozzle stationary ring, mill assembly 4 comprises bull ring pallet, described nozzle rotating ring is connected by bolt with bull ring pallet, described nozzle rotating ring is provided with nozzle rotating ring blade, described nozzle rotating ring blade material adopts 16Mn, blade quantity is at least 42, comprise rotary separator 2, rotary separator 2 adopts dynamic rotary separator, described rotary separator comprises rotor, the range of speeds of described rotor is 0 ~ 70r/min, rotary separator 2 comprises shell separator, reduce described shell separator height on the original basis.
The present invention, on the basis of existing lapping device, on the one hand, by widening grinding roller roller shell, reducing cornerite, to increase milling zone, thus accelerates the flowing of material, improves lapping uniformity; On the other hand, by reducing liner plate cornerite, increasing its arc radius, realizing to coordinate grinding roller roller shell optimizing grinding molded line; Again on the one hand, grinding roller roller shell and liner material quality all adopt abrasion resistance material Cr2021, and it is rich in rare metal, and wear rate is low, long service life, are applicable to Wind Volume and wash away; Improve nozzle ring structural design: adopt welded type nozzle ring, be bolted integral with bull ring pallet, follow mill and rotate, stationary ring is fixed on casing, is welded with high-abrasive material in nozzle stationary ring, to increase wearability; Optimize swivel nozzle blade material, quantity and blade tilt, to adapt to the requirement that large coal-air ratio and Wind Volume wash away, dynamic and static ring is taked split type, conveniently to manufacture, installs, maintenance; Loading system adopts hydraulic variable loading system, arranges size and stability that two cover proportional pressure control valve oil piping systems carry out controlled loading pressure, optimizes hydraulic oil pipeline system, to ensure grinding machine operation stability; According to product systems and air quantity requirement, the model basis of original Wind Volume reduces body height, improve housing profile, shorten the distance that wind powder mixture passes through, reduce circulating ratio, make coarse granule be easier to arrive meal outlet, optimize size and the angle of rotor blade, be more conducive to filtering out coarse granule coal dust; Optimize rotor speed scope.Technique scheme can meet and grinds particle diameter D
50it is the grinding requirement of the coarse granule coal dust of 0.4 ~ 0.5mm.
Claims (31)
1. a coal pulverizer, comprise lapping device, described lapping device comprises grinding roller assembly (3) and mill assembly (4), described grinding roller assembly (3) comprises grinding roller and grinding roller roller shell (8), described mill assembly (4) is provided with liner plate (9), it is characterized in that: the width of described grinding roller roller shell (8) increases by 6% to 8% on the basis of conventional type ZGM medium-speed pulverizer original grinding roller roller shell width, its cornerite reduces 18% to 20% on the basis of the original cornerite of conventional type ZGM medium-speed pulverizer, described liner plate (9) cornerite reduces 16% to 18% on the basis of the original liner plate cornerite of conventional type ZGM medium-speed pulverizer, its arc radius increases 23% to 25% on the basis of the original arc radius of conventional type ZGM medium-speed pulverizer.
2. coal pulverizer as claimed in claim 1, is characterized in that, grinding roller roller shell (8) material adopts Cr2021.
3. coal pulverizer as claimed in claim 2, is characterized in that, liner plate (9) material adopts Cr2021.
4. coal pulverizer as claimed in claim 3, is characterized in that, also comprise loading system.
5. coal pulverizer as claimed in claim 4, is characterized in that, described loading system adopts hydraulic variable loading system (1).
6. coal pulverizer as claimed in claim 5, is characterized in that, hydraulic variable loading system (1) is provided with at least two cover proportional pressure control valve oil piping systems.
7. coal pulverizer as claimed in claim 6, it is characterized in that, the pressure rating of described proportional pressure control valve oil piping system is at least 15MPa.
8. coal pulverizer as claimed in claim 7, it is characterized in that, the pressure adjusting scope of described proportional pressure control valve oil piping system is 0 ~ 15MPa.
9. coal pulverizer as claimed in claim 8, it is characterized in that, hydraulic variable loading system (1) comprises oil cylinder.
10. coal pulverizer as claimed in claim 9, it is characterized in that, described oil cylinder increases bore size on the basis of the original cylinder diameter of conventional type ZGM medium-speed pulverizer.
11. coal pulverizers as claimed in claim 10, it is characterized in that, described oil cylinder comprises rodless cavity.
12. coal pulverizers as claimed in claim 11, it is characterized in that, described rodless cavity one end is provided with back pressure system.
13. coal pulverizers as claimed in claim 12, it is characterized in that, described rodless cavity one end is also provided with accumulator.
14. coal pulverizers as claimed in claim 13, it is characterized in that, mill assembly (4) comprises nozzle ring (5).
15. coal pulverizers as claimed in claim 14, it is characterized in that, nozzle ring (5) comprises nozzle rotating ring and nozzle stationary ring.
16. coal pulverizers as claimed in claim 15, is characterized in that, described nozzle rotating ring adopts welding rotating ring (7).
17. coal pulverizers as claimed in claim 16, is characterized in that, comprise casing.
18. coal pulverizers as claimed in claim 17, is characterized in that, casing is installed with nozzle stationary ring.
19. coal pulverizers as claimed in claim 18, is characterized in that, described nozzle stationary ring adopts welding stationary ring (6).
20. coal pulverizers as claimed in claim 19, is characterized in that, be welded with high-abrasive material in described nozzle stationary ring.
21. coal pulverizers as claimed in claim 20, it is characterized in that, mill assembly (4) comprises bull ring pallet.
22. coal pulverizers as claimed in claim 21, it is characterized in that, described nozzle rotating ring is connected by bolt with bull ring pallet.
23. coal pulverizers as claimed in claim 22, it is characterized in that, described nozzle rotating ring is provided with nozzle rotating ring blade.
24. coal pulverizers as claimed in claim 23, is characterized in that, described nozzle rotating ring blade material adopts 16Mn.
25. coal pulverizers as claimed in claim 24, is characterized in that, described nozzle rotating ring blade quantity is at least 42.
26. coal pulverizers as claimed in claim 25, is characterized in that, comprise rotary separator (2).
27. coal pulverizers as claimed in claim 26, is characterized in that, rotary separator (2) adopts dynamic rotary separator.
28. coal pulverizers as claimed in claim 27, it is characterized in that, rotary separator (2) comprises rotor.
29. coal pulverizers as claimed in claim 28, is characterized in that, the range of speeds of described rotor is 0 ~ 70r/min.
30. coal pulverizers as claimed in claim 29, it is characterized in that, rotary separator (2) comprises shell separator.
31. coal pulverizers as claimed in claim 30, is characterized in that, the basis of conventional type ZGM medium-speed pulverizer original shell separator height reduces described shell separator height.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410057370.9A CN103769274B (en) | 2014-02-20 | 2014-02-20 | A kind of coal pulverizer |
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| CN201410057370.9A CN103769274B (en) | 2014-02-20 | 2014-02-20 | A kind of coal pulverizer |
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| CN103769274A CN103769274A (en) | 2014-05-07 |
| CN103769274B true CN103769274B (en) | 2016-03-23 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104998726A (en) * | 2015-08-18 | 2015-10-28 | 芜湖奕辰模具科技有限公司 | Coal mill for boiler |
| CN106890705B (en) * | 2017-04-18 | 2019-09-17 | 中国电建集团长春发电设备有限公司 | A kind of medium-speed pulverizer |
| CN108568334A (en) * | 2018-06-26 | 2018-09-25 | 北京华电润泽环保有限公司 | A kind of flow fieldoptimization device improving pulverizer capacity |
| CN109999982A (en) * | 2019-04-24 | 2019-07-12 | 国家能源投资集团有限责任公司 | Coal pulverizer base, coal pulverizer and coal pulverizer base fixing means |
| CN115283089A (en) * | 2022-09-02 | 2022-11-04 | 石家庄华邦矿产品有限公司 | Jet mill device for grinding powder |
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