CN204170759U - A kind of coal pulverizer comprising desanding system - Google Patents
A kind of coal pulverizer comprising desanding system Download PDFInfo
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- CN204170759U CN204170759U CN201420626003.1U CN201420626003U CN204170759U CN 204170759 U CN204170759 U CN 204170759U CN 201420626003 U CN201420626003 U CN 201420626003U CN 204170759 U CN204170759 U CN 204170759U
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- coal pulverizer
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Abstract
The utility model discloses a kind of coal pulverizer comprising desanding system, comprise coal spout, conical shell, mill separator and power gas source, conical shell is located at coal spout periphery, mill separator is located at conical shell top, power gas source provides compressed gas for coal pulverizer, also comprises the desanding device be positioned at below mill separator on conical shell, and desanding device comprises filter screen and gathering-device, filter screen is located on conical shell inwall, and the conical shell relative with filter screen is engraved structure; Gathering-device is located at conical shell periphery, its one end and docks with engraved structure, and the other end is provided with trash discharge mouth.Exerting oneself of the utility model coal pulverizer will be improved significantly, and the power consumption of unit powder process amount will decline; In addition, technical scheme is conducive to the wearing and tearing alleviating coal pulverizer inside, and then reduce the maintenance cost of coal pulverizer, because the fine sand entered in the coal dust of burner hearth significantly reduces, therefore all devices in coal pulverizer downstream and the wearing and tearing of pipeline will alleviate, and the maintenance cost of relevant device and pipeline also declines thereupon.
Description
Technical field
The utility model belongs to coal pulverizer field, power plant, relates to a kind of coal pulverizer with desanding function, can remove the sand grains in coal dust intermixture.
Background technology
China's generating set based on thermoelectricity, main supporting pulverized coal firing boiler.Raw coal is first smashed through coal breaker, then in coal pulverizer, grinds into coal dust.
Coal pulverizer is one of most important subsidiary engine of coal-fired station, and its operation conditions directly affects the safety and economic operation of boiler, meanwhile, and one of subsidiary engine that its Ye Shi power plant power consumption is maximum.According to the working speed of coal pulverizer, power plant coal is broadly divided into following three kinds: high speed coal mill, such as blower mill; Medium-speed pulverizer, such as square position coal pulverizer, ball coal pulverizer, Raymond bowl mill etc.; Low-speed coal mill, such as barrel-shaped steel ball mill.General barrel-shaped steel ball mill is used for bin storage type pulverizing system, and the coal pulverizer of other type is used for unit pulverized-coal system.
Modern large-sized station boiler adopts unit pulverized-coal system mostly, again due to medium-speed pulverizer have lightweight, take up an area little, reduced investment, the advantage such as power consumption is low, galling is low and noise is little, current domestic large-size thermal power plant generally all selects medium-speed pulverizer.
Medium-speed pulverizer at least by drive unit, milling device and mill separator three part form, equipment component is also furnished with coal powder distribation device.The rotation bull ring that above-mentioned milling device Chang Youyi drives by drive unit and three are along fixing of rolling of bull ring and can the mill rod of rotation form.Raw coal is fallen on bull ring by coal spout, to be moved to by raw coal and mills on raceway, milled by grinding roller by means of rotation bull ring centrifugal force.Raw coal mill and drying carry out simultaneously, heat primary air is evenly entered around bull ring by nozzle ring, dry through the coal dust intermixture tangentially thrown away from bull ring of milling and be delivered to the mill separator on coal pulverizer top, pebble coal falls into stone coal bin through nozzle ring.Coal dust intermixture is separated in mill separator, and meal is separated and returns bull ring and reface, and qualified fine powder is taken out of mill separator by First air and sent into hearth combustion.
In the above-mentioned coal pulverizer course of work, also comprise sand grains in coal dust intermixture, larger sand grains can be separated and return bull ring and reface.Because sand grains is more difficult levigate, need could be taken out of mill separator by First air through separating for several times and the circulation of milling.Sand grains, in coal pulverizer inner loop, not only increases the wearing and tearing of inner each parts, and have impact on exerting oneself of coal pulverizer, adds full factory power consumption.In coal dust intermixture, sand grains is also containing a large amount of sulphur, if can remove this part sulphur from source, will be conducive to reducing sulphur emissions, and reduce the operating cost of desulphurization system.Levigate sand grains sprays into burner hearth, also may aggravate boiler scaling, increases the growing amount of NOx, reduce boiler efficiency.
Utility model content
In order to overcome deficiency of the prior art, the utility model provides a kind of coal pulverizer, effectively can remove the sand grains in coal dust.
For solving the problem, the utility model adopts following technical scheme:
A kind of coal pulverizer comprising desanding system, comprise coal spout, conical shell, mill separator and power gas source, conical shell is located at coal spout periphery, mill separator is located at conical shell top, power gas source provides compressed gas for coal pulverizer, also comprises the desanding device be positioned at below mill separator on conical shell, and desanding device comprises filter screen and gathering-device, filter screen is located on conical shell inwall, and the conical shell relative with filter screen is engraved structure; Gathering-device is located at conical shell periphery, its one end and docks with engraved structure, and the other end is provided with trash discharge mouth.
The direction that coal cinder in coal spout falls by the application is defined as direction from top to bottom; The other parts of above-mentioned coal pulverizer except desanding device all can refer to prior art.
Preferably, desanding device is positioned on the conical shell of mill separator vertical lower.
Applicant finds after deliberation, rough coal powder and sand grains is comprised through the isolated meal of mill separator, from apparent size, the average grain diameter of sand grains is less than the average grain diameter of rough coal powder, adopt said apparatus, rough coal powder keeps off outside filter screen in the process fallen, and falls into coal-grinding apparatus along conical shell and again grind, sand grains then falls into gathering-device by filter screen, achieves the separation of sand grains.
Be provided with current equalizer in gathering-device, the side of gathering-device is provided with inlet plenum, and inlet plenum is communicated with gathering-device, and be positioned at the below of current equalizer on inlet plenum and with the connectivity part of gathering-device, inlet plenum is provided with air inlet, air inlet and power gas source pipeline communication.
Above-mentioned air inlet and power gas source pipeline communication, in inlet plenum, compressed air is provided by power gas source, compressed air enters gathering-device by inlet plenum, and by entering conical shell through filter screen after current equalizer homogenizing, density due to sand grains is greater than the density of rough coal powder, therefore compressed-air actuated flow and pressure should be enough to fluidisation rough coal powder and be not enough to fluidisation sand grains, and then are conducive to being separated further of rough coal powder and sand grains, improve the effect of desanding.The object of above-mentioned current equalizer is that the compressed air making to pass through is as far as possible even.
Inlet plenum is located at the inner side of gathering-device, and inlet plenum is communicated with by the pore arranged along gathering-device inner circumferential with gathering-device.Said structure inlet plenum and gathering-device share a side, and pore is just located on shared side, and the compressed air in inlet plenum enters gathering-device by pore.
The direction that the application will be defined as from coal spout axle center to the direction of external diffusion from inside to outside.
Filter screen and current equalizer make by orifice plate, and filter screen is arranged along conical shell inner peripheral wall, and current equalizer is arranged along conical shell outer wall periphery.Said apparatus not only structure is simple, and can improve the separative efficiency of sand grains further.
The tapering of filter screen is greater than the tapering of conical shell.
Filter screen comprises elementary filter screen and secondary screen, and elementary filter screen is located at above secondary screen, and the tapering of elementary filter screen is greater than the tapering of secondary screen.Above-mentioned elementary filter screen plays the effect of protection secondary screen, in case bulk hard object directly drops and to damage on secondary screen, above-mentioned secondary screen plays the effect being separated rough coal powder and coarse sand granule.
Elementary filter screen offers the first long lumbar hole, the opposite side distance of the first long lumbar hole is 4 ~ 12mm; Secondary screen offers the second long lumbar hole, the opposite side distance of the second long lumbar hole is 0.5 ~ 2mm; First long lumbar hole is consistent with the generatrix direction of elementary filter screen and secondary screen place cone respectively with the length direction of the second long lumbar hole.
The particle diameter that the opposite side distance of secondary screen long lumbar hole is less than rough coal powder is greater than the particle diameter of sand grains, and by secondary screen, rough coal powder cannot pass through secondary screen to sand grains, and then reaches the object of desanding.Above-mentioned improvement can further improve desanding efficiency.
The eyelet of above-mentioned secondary screen is less, the easy phenomenon that blocking occurs, for head it off, the second long lumbar hole is from top to bottom the shape of flaring along the thickness direction of secondary screen, and the maximum opposite side distance of same second long lumbar hole and the difference of minimum opposite side distance are 0.2 ~ 1.5mm.
The current-sharing effect of current equalizer will directly affect the separating effect of rough coal powder and sand grains, and in order to improve the current-sharing effect of above-mentioned current equalizer, preferably, current equalizer is stacked together by two-layer above orifice plate, interval 1 ~ 10cm between every layer of orifice plate, and total number of plies is preferably 5 ~ 10 layers; The orifice plate of current equalizer all offers the circular hole that diameter is 4 ~ 8mm.
Above-mentioned coal pulverizer, also comprises the waste tank be located at outside coal pulverizer, air compressor, air accumulator and controller; Waste tank is provided with waste material import and waste outlet, waste material import and trash discharge mouth pipeline communication; Waste material import is provided with waste tank import isolating valve, waste outlet is provided with waste outlet isolating valve, the pipeline that waste material import is communicated with trash discharge mouth is provided with coal pulverizer isolating valve, and the pipeline that the enterprising gas port of inlet plenum is communicated with power gas source is provided with fluidization air control valve; Air compressor and air accumulator pipeline communication, air accumulator respectively with waste tank import isolating valve, waste outlet isolating valve, coal pulverizer isolating valve and fluidization air control valve pipeline communication, controller is electrically connected with waste tank import isolating valve, waste outlet isolating valve, coal pulverizer isolating valve and fluidization air control valve respectively.
Also other valve can be set up as required in practice.
Above-mentioned controller, air compressor and air accumulator combine, and can control the keying of each isolating valve and control the aperture of fluidisation air shut-off valve, and then regulating the compressed-air actuated flow and the pressure that enter desander.Above-mentioned compressed air is from power gas source, and power gas source is preferably the existing primary air fan in power plant.
Above-mentioned controller principle is with reference to prior art.
The NM technology of the utility model is prior art.
The desanding device of a kind of coal pulverizer of the utility model, may be used for the technological transformation to existing equipment, also can directly supportingly be arranged on new equipment; Adopt technique scheme, exerting oneself of coal pulverizer will be improved significantly, and the power consumption of unit powder process amount will decline; In addition, technical scheme is conducive to the wearing and tearing alleviating coal pulverizer inside, and then reduce the maintenance cost of coal pulverizer, because the fine sand entered in the coal dust of burner hearth significantly reduces, therefore all devices in coal pulverizer downstream and the wearing and tearing of pipeline will alleviate, and the maintenance cost of relevant device and pipeline also declines thereupon; Owing to containing a large amount of sulphur in the sand grains that the utility model removes, be therefore conducive to the sulphur emissions reducing power plant, reduce the operating cost of desulphurization system; The utility model is applied to coal pulverizer, and its milling performance gets a promotion, the discharge that the coal dust spraying into burner hearth is conducive to improving boiler efficiency, alleviates boiler scaling phenomenon, reduces NOx.
Accompanying drawing explanation
Fig. 1 is system flow chart of the present utility model.
Fig. 2 be the utility model the structural representation of coal pulverizer that is suitable for.
Fig. 3 is the structural representation of the utility model desander.
Fig. 4 is the structural representation of the elementary filter screen of the utility model.
Fig. 5 is the enlarged diagram of a-quadrant in Fig. 4.
Fig. 6 is the structural representation of the utility model secondary screen.
Fig. 7 is the enlarged diagram in B region in Fig. 6.
Fig. 8 is the schematic cross-section of the utility model second long lumbar hole along secondary screen thickness direction.
Fig. 9 is the structural representation of the utility model current equalizer orifice plate.
In figure, 0 is coal pulverizer, 1 is desander, 2 is waste tank, 3 is power gas source (primary air fan), 4 is controller, 5 is fluidization air control valve, 6 is coal pulverizer isolating valve, 7 is waste tank import isolating valve, 8 is waste tank outlet isolating valve, 9 is air compressor, 10 is air accumulator, 11 is desander installation position, 12 is mill separator, 13 is coal spout, 14 is bull ring, 15 is grinding roller, 16 is nozzle ring, 17 is drive unit, 18 is stone coal bin, 19 is heat primary air, 20 is coal dust intermixture (containing meal and fine powder), 21 is meal (containing rough coal powder and sand grains), 22 is fine powder, 23 is raw coal and meal mixture, 24 is pebble coal, 25 is conical shell, 26 is current equalizer, 27 is secondary screen, 28 is elementary filter screen, 29 is air inlet, 30 is circumferential uniform pore, 31 is trash discharge mouth, a is the opposite side distance on the upside of secondary screen long lumbar hole, and b is the opposite side distance on the downside of secondary screen long lumbar hole, A is elementary filter screen local magnification region, and B is secondary screen local magnification region.
Detailed description of the invention
In order to understand the utility model better, illustrate content of the present utility model further below in conjunction with embodiment, but content of the present utility model is not only confined to the following examples.
Embodiment 1
Coal pulverizer as shown in the figure, comprise coal spout, conical shell, mill separator, power gas source, desanding device, the waste tank be located at outside coal pulverizer, air compressor, air accumulator and controller, conical shell is located at coal spout periphery, mill separator is located at conical shell top, and power gas source provides compressed gas for coal pulverizer; Desanding device is positioned at below mill separator on conical shell, and desanding device comprises filter screen and gathering-device, and filter screen is located on conical shell inwall, and the conical shell relative with filter screen is engraved structure; Gathering-device is located at conical shell periphery, its one end and docks with engraved structure, and the other end is provided with trash discharge mouth; Current equalizer is provided with in gathering-device, the inner side of gathering-device is provided with inlet plenum, inlet plenum is communicated with by the pore arranged along gathering-device inner circumferential with gathering-device, the below of current equalizer is positioned on inlet plenum and with the connectivity part of gathering-device, inlet plenum is provided with air inlet, air inlet and power gas source pipeline communication; Waste tank is provided with waste material import and waste outlet, waste material import and trash discharge mouth pipeline communication; Waste material import is provided with waste tank import isolating valve, and waste outlet is provided with waste outlet isolating valve, and the pipeline that waste material import is communicated with trash discharge mouth is provided with coal pulverizer isolating valve; The pipeline that the enterprising gas port of inlet plenum is communicated with power gas source is provided with fluidization air control valve; Air compressor and air accumulator pipeline communication, air accumulator respectively with waste tank import isolating valve, waste outlet isolating valve, coal pulverizer isolating valve and fluidization air control valve pipeline communication, controller is electrically connected with waste tank import isolating valve, waste outlet isolating valve, coal pulverizer isolating valve and fluidization air control valve respectively.
Above-mentioned filter screen and current equalizer make by orifice plate, and filter screen is arranged along conical shell inner peripheral wall, and current equalizer is arranged along conical shell outer wall periphery; The tapering of filter screen is greater than the tapering of conical shell.
Filter screen comprises elementary filter screen and secondary screen, and elementary filter screen is located at above secondary screen, and the tapering of elementary filter screen is greater than the tapering of secondary screen; Elementary filter screen offers the first long lumbar hole, the opposite side distance of the first long lumbar hole is 8mm; Secondary screen offers the second long lumbar hole, the opposite side distance of the second long lumbar hole is 1 ~ 1.5mm; First long lumbar hole is consistent with the generatrix direction of elementary filter screen and secondary screen place cone respectively with the length direction of the second long lumbar hole; Second long lumbar hole is from top to bottom the shape of flaring along the thickness direction of secondary screen, and the maximum opposite side distance of same second long lumbar hole and the difference of minimum opposite side distance are 0.5mm.
Current equalizer is stacked together by 8 layers of orifice plate, interval 6cm between every layer of orifice plate; The orifice plate of current equalizer all offers the circular hole that diameter is 6mm.
Embodiment 2
Substantially the same manner as Example 1, difference is: the opposite side distance of the first long lumbar hole is 4mm; The opposite side distance of the second long lumbar hole is 0.5 ~ 0.7mm; The maximum opposite side distance of same second long lumbar hole and the difference of minimum opposite side distance are 0.2mm.Current equalizer is stacked together by 5 layers of orifice plate, interval 2cm between every layer of orifice plate; The orifice plate of current equalizer all offers the circular hole that diameter is 4mm.
Embodiment 3
Substantially the same manner as Example 1, difference is: the opposite side distance of the first long lumbar hole is 12mm; The opposite side distance of the second long lumbar hole is 1 ~ 2mm; The maximum opposite side distance of same second long lumbar hole and the difference of minimum opposite side distance are 1mm.Current equalizer is stacked together by 10 layers of orifice plate, interval 10cm between every layer of orifice plate; The orifice plate of current equalizer all offers the circular hole that diameter is 8mm.
Claims (10)
1. one kind comprises the coal pulverizer of desanding system, comprise coal spout, conical shell, mill separator and power gas source, conical shell is located at coal spout periphery, mill separator is located at conical shell top, power gas source provides compressed gas for coal pulverizer, it is characterized in that: also comprise the desanding device be positioned at below mill separator on conical shell, and desanding device comprises filter screen and gathering-device, filter screen is located on conical shell inwall, and the conical shell relative with filter screen is engraved structure; Gathering-device is located at conical shell periphery, its one end and docks with engraved structure, and the other end is provided with trash discharge mouth.
2. comprise the coal pulverizer of desanding system as claimed in claim 1, it is characterized in that: in gathering-device, be provided with current equalizer, the side of gathering-device is provided with inlet plenum, inlet plenum is communicated with gathering-device, the below of current equalizer is positioned on inlet plenum and with the connectivity part of gathering-device, inlet plenum is provided with air inlet, air inlet and power gas source pipeline communication.
3. comprise the coal pulverizer of desanding system as claimed in claim 2, it is characterized in that: inlet plenum is located at the inner side of gathering-device, inlet plenum is communicated with by the pore arranged along gathering-device inner circumferential with gathering-device.
4. comprise the coal pulverizer of desanding system as claimed in claim 2, it is characterized in that: filter screen and current equalizer make by orifice plate, filter screen is arranged along conical shell inner peripheral wall, and current equalizer is arranged along conical shell outer wall periphery.
5. the coal pulverizer comprising desanding system as described in claim 1-4 any one, is characterized in that: the tapering of filter screen is greater than the tapering of conical shell.
6. comprise the coal pulverizer of desanding system as claimed in claim 5, it is characterized in that: filter screen comprises elementary filter screen and secondary screen, elementary filter screen is located at above secondary screen, and the tapering of elementary filter screen is greater than the tapering of secondary screen.
7. comprise the coal pulverizer of desanding system as claimed in claim 6, it is characterized in that: elementary filter screen offers the first long lumbar hole, the opposite side distance of the first long lumbar hole is 4 ~ 12mm; Secondary screen offers the second long lumbar hole, the opposite side distance of the second long lumbar hole is 0.5 ~ 2mm; First long lumbar hole is consistent with the generatrix direction of elementary filter screen and secondary screen place cone respectively with the length direction of the second long lumbar hole.
8. comprise the coal pulverizer of desanding system as claimed in claim 7, it is characterized in that: the second long lumbar hole is from top to bottom the shape of flaring along the thickness direction of secondary screen, and the maximum opposite side distance of same second long lumbar hole and the difference of minimum opposite side distance are 0.2 ~ 1.5mm.
9. the coal pulverizer comprising desanding system as described in claim 2-4 any one, is characterized in that: current equalizer is stacked together by two-layer above orifice plate, interval 1 ~ 10cm between every layer of orifice plate; The orifice plate of current equalizer all offers the circular hole that diameter is 4 ~ 8mm.
10. the coal pulverizer comprising desanding system as described in claim 2-4 any one, is characterized in that: also comprise the waste tank be located at outside coal pulverizer, air compressor, air accumulator and controller; Waste tank is provided with waste material import and waste outlet, waste material import and trash discharge mouth pipeline communication; Waste material import is provided with waste tank import isolating valve, and waste outlet is provided with waste outlet isolating valve, and the pipeline that waste material import is communicated with trash discharge mouth is provided with coal pulverizer isolating valve; The pipeline that the enterprising gas port of inlet plenum is communicated with power gas source is provided with fluidization air control valve; Air compressor and air accumulator pipeline communication, air accumulator respectively with waste tank import isolating valve, waste outlet isolating valve, coal pulverizer isolating valve and fluidization air control valve pipeline communication, controller is electrically connected with waste tank import isolating valve, waste outlet isolating valve, coal pulverizer isolating valve and fluidization air control valve respectively.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420626003.1U CN204170759U (en) | 2014-10-27 | 2014-10-27 | A kind of coal pulverizer comprising desanding system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420626003.1U CN204170759U (en) | 2014-10-27 | 2014-10-27 | A kind of coal pulverizer comprising desanding system |
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| CN204170759U true CN204170759U (en) | 2015-02-25 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105750022A (en) * | 2016-03-16 | 2016-07-13 | 南京博沃科技发展有限公司 | Medium-speed coal mill with deashing desulfurizing device |
| CN105833952A (en) * | 2016-03-29 | 2016-08-10 | 时建华 | Energy-saving high coal power grinding device |
-
2014
- 2014-10-27 CN CN201420626003.1U patent/CN204170759U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105750022A (en) * | 2016-03-16 | 2016-07-13 | 南京博沃科技发展有限公司 | Medium-speed coal mill with deashing desulfurizing device |
| CN105750022B (en) * | 2016-03-16 | 2017-12-26 | 南京博沃科技发展有限公司 | A kind of medium-speed pulverizer of the grey desulfurizing device containing drop |
| CN105833952A (en) * | 2016-03-29 | 2016-08-10 | 时建华 | Energy-saving high coal power grinding device |
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