CN204026721U - Coal dust classifier and pulverized-coal fired boiler - Google Patents
Coal dust classifier and pulverized-coal fired boiler Download PDFInfo
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- CN204026721U CN204026721U CN201420365953.3U CN201420365953U CN204026721U CN 204026721 U CN204026721 U CN 204026721U CN 201420365953 U CN201420365953 U CN 201420365953U CN 204026721 U CN204026721 U CN 204026721U
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- 239000003245 coal Substances 0.000 title claims abstract description 148
- 239000002817 coal dust Substances 0.000 title claims abstract description 75
- 239000012528 membrane Substances 0.000 claims abstract description 52
- 238000000926 separation method Methods 0.000 claims abstract description 38
- 230000000694 effects Effects 0.000 claims abstract description 28
- 238000005119 centrifugation Methods 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 16
- 239000000843 powder Substances 0.000 claims description 19
- 238000013459 approach Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 230000037237 body shape Effects 0.000 claims description 3
- 238000002485 combustion reaction Methods 0.000 abstract description 17
- 238000005516 engineering process Methods 0.000 abstract description 4
- 239000002245 particle Substances 0.000 description 5
- 239000007921 spray Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000002045 lasting effect Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000005266 casting Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000005514 two-phase flow Effects 0.000 description 1
Abstract
The utility model discloses a kind of coal dust classifier and pulverized-coal fired boiler, relate to thermal power generating technology field.Solve prior art and had the lower technical problem of burning operating efficiency.This coal dust classifier comprises Membrane Separator Cylinder for CFB Boiler, rotating separation device, concentrated phase outlet and light phase outlet, rotating separation device can lead to the pulverized coal borne air flow of process, under the rotating centrifugal centrifugation that pulverized coal borne air flow causes in guide effect, can be separated into light pulverized coal borne air flow and dense pulverized coal borne air flow; The flow direction of light pulverized coal borne air flow is the influent stream mouth to light phase outlet just, and light phase outlet is through Membrane Separator Cylinder for CFB Boiler or concentrated phase outlet; The influent stream mouth of concentrated phase outlet is connected with the head piece that goes out of Membrane Separator Cylinder for CFB Boiler.This pulverized-coal fired boiler comprises burner hearth and is positioned at the coal dust classifier that the utility model outside burner hearth provides.The utility model is for improving the efficiency of combustion of pulverized-coal fired boiler.
Description
Technical field
The utility model relates to thermal power generating technology field, relates in particular to a kind of coal dust classifier and the pulverized-coal fired boiler of this coal dust classifier is set.
Background technology
It is that thermal power plant etc. exists an indispensable link in multiple working links in the Workplace of Gas-solid Two-phase Flow that gas-solid two is separated.
The course of work of thermal power plant's coal dust boiler is: the qualified coal dust that pulverized coal feed pipe grinds pulverized coal preparation system, send in burner hearth by the burner of combustion system, coal dust is lighted after burner outlet and part air complete mixing, along with the carrying out of burning, later stage constantly fills into new air and carrys out overheavy firing, burning liberated heat passes to a pot interior working medium in the mode of heat convection and radiant heat transfer, qualified working medium after heating is admitted in steam turbine does work, and steam turbine drives generator to rotate and produces electric energy.
The height of coal-burning power plant's efficiency is mainly subject to the impact of pulverized-coal fired boiler operating efficiency, and pulverized-coal fired boiler safely, operate efficiently in and depend on to a great extent the reasonable Arrangement of pulverized coal preparation system and the high efficient and reliable of combustion system.For this reason, the scientific research in numerous coal-fired boiler combustions field and producers have done a large amount of research work to it.
The method that realizes coal powder light-dark separation in prior art is varied, the main method adopting has: utilize the raw centrifugation of diverted flow movable property of elbow to form deep or light separation, utilize shutter stop and drainage forms deep or light separation, utilize the rotational flow generation centrifugal force of cyclone cylinder to form deep or light separation, utilize stopping of stopper to form deep or light separation etc.Utilize these methods can produce panoramic coal dust separation equipment, separate and concentrator by install rational coal dust additional at burner inlet, air in the wind powder mixture that pulverized coal feed pipe can be sent here and coal dust are separated into two strands of air-flows, i.e. main gas and weary gas.
The applicant finds: prior art at least exists following technical problem:
The coal powder light-dark separation method that prior art provides, separating effect is undesirable, causes utilizing the burn burning operating efficiency of pulverized-coal fired boiler of operation of pulverized coal borne air flow after this coal powder light-dark separation method separates lower.
Utility model content
One of them object of the present utility model is the pulverized-coal fired boiler that proposes a kind of coal dust classifier and this coal dust classifier is set, and has solved prior art and has had the lower technical problem of burning operating efficiency.
Many technique effects that the utility model optimal technical scheme can produce refer to below sets forth.
For achieving the above object, the utility model provides following technical scheme:
The coal dust classifier that the utility model embodiment provides, comprises Membrane Separator Cylinder for CFB Boiler, rotating separation device, concentrated phase outlet and light phase outlet, wherein:
Within described rotating separation device is fixedly installed on described Membrane Separator Cylinder for CFB Boiler, described rotating separation device can lead to the pulverized coal borne air flow of process, can be separated into the relatively low light pulverized coal borne air flow of the coal powder density of the axial line position that approaches described Membrane Separator Cylinder for CFB Boiler and the relatively high dense pulverized coal borne air flow of coal powder density between described light pulverized coal borne air flow and described Membrane Separator Cylinder for CFB Boiler under the rotating centrifugal centrifugation that described pulverized coal borne air flow causes in guide effect;
The influent stream mouth of described light phase outlet is positioned at the downstream of described rotating separation device, and the flow direction of described light pulverized coal borne air flow is the influent stream mouth to described light phase outlet just, described light phase outlet is through described Membrane Separator Cylinder for CFB Boiler or described concentrated phase outlet, and the head piece that goes out of described light phase outlet is positioned at outside described Membrane Separator Cylinder for CFB Boiler and described concentrated phase outlet;
The influent stream mouth of described concentrated phase outlet is connected with the head piece that goes out of described Membrane Separator Cylinder for CFB Boiler.
At one preferably or alternatively in embodiment, described rotating separation device comprises that central bluff body and the circumferential direction interval along described central bluff body are fixedly installed at least two blades on described central bluff body, under the rotating centrifugal centrifugation causing, can be separated into described light pulverized coal borne air flow and described dense pulverized coal borne air flow through the described pulverized coal borne air flow between described blade, described central bluff body and described Membrane Separator Cylinder for CFB Boiler inwall in the guide effect of described central bluff body and described blade.
At one preferably or alternatively in embodiment, described blade is to have angle between maximum planes on rectangular slab and described blade and the axial line of described central bluff body; Or described blade is the plate that is provided with cambered surface.
At one preferably or alternatively in embodiment, described angle be 0 °～90 ° and do not comprise 0 ° with 90 °.
At one, preferably or alternatively in embodiment, described blade is evenly distributed on the outer surface of described central bluff body along the circumferential direction of the axial line of described central bluff body.
At one, preferably or alternatively in embodiment, described central bluff body is rotary body shape, and the axial line of its axial line and described Membrane Separator Cylinder for CFB Boiler coincides.
At one preferably or alternatively in embodiment, along the flow direction of described pulverized coal borne air flow, described central bluff body comprises flaring conical shell section, cylindrical section and the tapered conical cylinder section of mutual smooth connection according to this, and described blade is fixedly installed in the circumferential exterior surface of described cylindrical section.
At one preferably or alternatively in embodiment, the influent stream mouth of described Membrane Separator Cylinder for CFB Boiler is also connected with inlet tube, described pulverized coal borne air flow is entered the influent stream mouth of described Membrane Separator Cylinder for CFB Boiler by described inlet tube, the internal diameter size of described inlet tube increases gradually along the flow direction of described pulverized coal borne air flow.
At one preferably or alternatively in embodiment, described central bluff body and described blade at least one of them outer surface and described inlet tube, described Membrane Separator Cylinder for CFB Boiler, described concentrated phase outlet and described light phase outlet at least one of them inner surface be coated with wear-resistant material layer.
At one, preferably or alternatively in embodiment, described concentrated phase outlet is bend pipe, and described light phase outlet is straight tube, and the entering of flow path direction and himself that go out of described concentrated phase outlet exists angle between flow path direction;
Or described light phase outlet is bend pipe, described concentrated phase outlet is straight tube, and the entering of flow path direction and himself that go out of described light phase outlet exists angle between flow path direction;
Or described concentrated phase outlet and described light phase outlet are bend pipe; Between flow path direction, there is angle in the entering of flow path direction and himself that go out of described concentrated phase outlet; Between flow path direction, also there is angle in the entering of flow path direction and himself that go out of described light phase outlet.
At one preferably or alternatively in embodiment, on described light phase outlet, be provided with the adjusting device that can regulate himself circulation area size.
The pulverized-coal fired boiler that the utility model embodiment provides, comprises burner hearth and is positioned at the coal dust classifier that the arbitrary technical scheme of the utility model outside described burner hearth provides, wherein:
The head piece that goes out of the described concentrated phase outlet of described coal dust classifier is connected with the main gas blowout mouth of a wind of described burner hearth;
The head piece that goes out of the described light phase outlet of described coal dust classifier is connected with the weary gas blowout mouth of described burner hearth.
Based on technique scheme, the utility model embodiment at least can produce following technique effect:
Rotating separation device in the coal dust classifier that the utility model provides can lead to the pulverized coal borne air flow of process, under the rotating centrifugal centrifugation that pulverized coal borne air flow causes in guide effect, can be separated into light pulverized coal borne air flow and dense pulverized coal borne air flow, and can light pulverized coal borne air flow be drawn by light phase outlet, by concentrated phase outlet, dense pulverized coal borne air flow is drawn, the rotating centrifugal centrifugation that utilizes guide effect to cause is carried out deep or light separation to pulverized coal borne air flow, separating effect is comparatively desirable, the coal dust content of the dense pulverized coal borne air flow producing is higher than prior art, when the concentration of coal dust is higher, in combustion process, greatly reduce coal powder ignition heat, be conducive to the ignition and steady combustion of coal dust, improve burning operating efficiency.
In the utility model, light phase outlet and concentrated phase outlet not only can avoid light pulverized coal borne air flow and dense pulverized coal borne air flow can not interact effectively, keep thus the effect of deep or light separation comparatively lasting, and light pulverized coal borne air flow and dense pulverized coal borne air flow can be drawn by two independent pipelines respectively, be convenient to external coal dust classifier at pulverized-coal fired boiler, and arrange neatly the position of coal dust classifier.
The light pulverized coal borne air flow that the coal dust classifier providing through the utility model obtains after separating forms weary gas, dense pulverized coal borne air flow forms main gas, weary gas can spray into burner hearth by weary gas blowout mouth, main gas can spray into hearth combustion by a main gas blowout mouth of wind, the concentration of the coal dust containing due to main gas is higher, in combustion process, greatly reduce coal powder ignition heat, be conducive to the ignition and steady combustion of coal dust, improve the burning operating efficiency of pulverized-coal fired boiler, had the lower technical problem of burning operating efficiency so solved prior art.
Brief description of the drawings
Accompanying drawing described herein is used to provide further understanding of the present utility model, forms the application's a part, and schematic description and description of the present utility model is used for explaining the utility model, does not form improper restriction of the present utility model.In the accompanying drawings:
The schematic diagram of the coal dust classifier that Fig. 1 provides for the utility model embodiment;
Fig. 2 is the schematic diagram of rotating separation device shown in Fig. 1;
The schematic diagram of the coal dust classifier that Fig. 3 provides for the utility model embodiment;
Reference numeral: 1, Membrane Separator Cylinder for CFB Boiler; 2, rotating separation device; 21, central bluff body; 211, flaring conical shell section; 212, cylindrical section; 213, tapered conical cylinder section; 22, blade; 3, concentrated phase outlet; 4, light phase outlet; 5, inlet tube; 6, adjusting device.
Detailed description of the invention
Can understand the distinctive points between content of the present utility model and the utility model and prior art with reference to accompanying drawing Fig. 1～Fig. 3 and word content below.Below by accompanying drawing and enumerate the mode of optional embodiment more of the present utility model, the technical solution of the utility model (comprising optimal technical scheme) is described in further detail.It should be noted that: any technical characterictic in the present embodiment, any technical scheme is all one or more in technical characterictic or the optional technical scheme of plurality of optional, cannot exhaustive all alternative technical characterictics of the present utility model and alternative technical scheme in order to describe succinct need in presents, also the embodiment that is not easy to each technical characterictic all emphasizes that it is one of optional numerous embodiments, so those skilled in the art should know: arbitrary technological means that the utility model can be provided is replaced or any two or more technological means or technical characterictic that the utility model is provided combine mutually and obtain new technical scheme.Any technical characterictic in the present embodiment and any technical scheme all do not limit protection domain of the present utility model, protection domain of the present utility model should comprise those skilled in the art do not pay creative work thinkable any alternate embodiments and those skilled in the art any two or more technological means that the utility model is provided or technical characterictic combine mutually and the new technical scheme that obtains.
The utility model embodiment provides a kind of can realize that coal powder light-dark separates preferably, higher, the position of burning operating efficiency coal dust classifier and the pulverized-coal fired boiler of this coal dust classifier is set flexibly.
Technical scheme the utility model being provided below in conjunction with Fig. 1～Fig. 3 is carried out more detailed elaboration.
As shown in FIG. 1 to 3, the coal dust classifier that the utility model embodiment provides comprises Membrane Separator Cylinder for CFB Boiler 1, rotating separation device 2, concentrated phase outlet 3 and light phase outlet 4 as shown in Figure 1, wherein:
Within rotating separation device 2 is fixedly installed on Membrane Separator Cylinder for CFB Boiler 1, rotating separation device 2 can lead to the pulverized coal borne air flow of process, can be separated into the relatively low light pulverized coal borne air flow of the coal powder density of the axial line position that approaches Membrane Separator Cylinder for CFB Boiler 1 and the relatively high dense pulverized coal borne air flow of coal powder density between light pulverized coal borne air flow and Membrane Separator Cylinder for CFB Boiler 1 under the rotating centrifugal centrifugation that pulverized coal borne air flow causes in guide effect.
The influent stream mouth of light phase outlet 4 is positioned at the downstream of rotating separation device 2, and the flow direction of light pulverized coal borne air flow is the influent stream mouth to light phase outlet 4 just, light phase outlet 4 is through Membrane Separator Cylinder for CFB Boiler 1 or concentrated phase outlet 3, and the head piece that goes out of light phase outlet 4 is positioned at outside Membrane Separator Cylinder for CFB Boiler 1 and concentrated phase outlet 3.The influent stream mouth of concentrated phase outlet 3 is connected with the head piece that goes out of Membrane Separator Cylinder for CFB Boiler 1.The influent stream mouth of concentrated phase outlet 3 and the head piece that goes out of Membrane Separator Cylinder for CFB Boiler 1 are preferably seamless link.Concentrated phase outlet 3 is preferably integral structure with Membrane Separator Cylinder for CFB Boiler 1.
Rotating separation device 2 in the coal dust classifier that the utility model provides can lead to the pulverized coal borne air flow of process, under the rotating centrifugal centrifugation that pulverized coal borne air flow causes in guide effect, can be separated into light pulverized coal borne air flow and dense pulverized coal borne air flow, and can light pulverized coal borne air flow be drawn by light phase outlet 4, by concentrated phase outlet 3, dense pulverized coal borne air flow is drawn, the rotating centrifugal centrifugation that utilizes guide effect to cause is carried out deep or light separation to pulverized coal borne air flow, separating effect is comparatively desirable, the coal dust content of the dense pulverized coal borne air flow producing is higher than prior art, the coal dust content of light pulverized coal borne air flow is lower than prior art, when the concentration of coal dust is higher, in combustion process, greatly reduce coal powder ignition heat, be conducive to the ignition and steady combustion of coal dust, improve burning operating efficiency.
Simultaneously, in the utility model, light phase outlet 4 not only can avoid light pulverized coal borne air flow and dense pulverized coal borne air flow to interact with concentrated phase outlet 3 effectively, keep thus the effect of deep or light separation comparatively lasting, and light pulverized coal borne air flow and dense pulverized coal borne air flow can be drawn by two independent pipelines respectively, be convenient to external coal dust classifier at pulverized-coal fired boiler, and arrange neatly the position of coal dust classifier, and then can improve the burn burning operating efficiency of pulverized-coal fired boiler of operation of the pulverized coal borne air flow utilizing after separating.
The light pulverized coal borne air flow that the coal dust classifier providing through the utility model obtains after separating forms weary gas, dense pulverized coal borne air flow forms main gas, weary gas can spray into burner hearth by weary gas blowout mouth, main gas can spray into hearth combustion by a main gas blowout mouth of wind, the concentration of the coal dust containing due to main gas is higher, in combustion process, greatly reduce coal powder ignition heat, be conducive to the ignition and steady combustion of coal dust, improved the burning operating efficiency of pulverized-coal fired boiler.
As embodiment preferably or alternatively, rotating separation device 2 comprises that as shown in Figure 2 central bluff body 21 and the circumferential direction interval along central bluff body 21 are fixedly installed at least two blades 22 on central bluff body 21 as shown in Figure 1, under the rotating centrifugal centrifugation causing, can be separated into light pulverized coal borne air flow and dense pulverized coal borne air flow through the pulverized coal borne air flow between blade 22, central bluff body 21 and Membrane Separator Cylinder for CFB Boiler 1 inwall in the guide effect of central bluff body 21 and blade 22.
Under the rotating centrifugal centrifugation that pulverized coal borne air flow mainly causes in the guide effect of blade 22, the pulverized coal particle that quality is larger is separated under stronger centrifugal action, be thrown toward near Membrane Separator Cylinder for CFB Boiler 1 inwall side flow, the air-flow that suffered centrifugal force is less flows near central bluff body 21, so light pulverized coal borne air flow has flowed to the axial line position that approaches Membrane Separator Cylinder for CFB Boiler 1 after blade 22, dense pulverized coal borne air flow has flowed to the position between light pulverized coal borne air flow and Membrane Separator Cylinder for CFB Boiler 1.
As embodiment preferably or alternatively, there is angle between the maximum planes on rectangular slab and blade 22 and the axial line of central bluff body 21 in blade 22, and this angle can be 0 °～90 ° and not comprise 0 ° and 90 °.This angle is preferably 30 °～60 °.Or blade 22 is for being provided with the plate of cambered surface.
Blade 22 is convenient to dismounting, replacing during for rectangular slab, and tactical rule, simple, is convenient to manufacture in batches.In the time that angle value is in above-mentioned scope, blade 22 can play comparatively desirable guide effect to air-flow, and then more effectively pulverized coal borne air flow is led and utilize the rotating centrifugal centrifugation of guide effect initiation to carry out deep or light separation.
As embodiment preferably or alternatively, blade 22 is evenly distributed on the outer surface of central bluff body 21 along the circumferential direction of the axial line of central bluff body 21.This is designed with to be beneficial to and keeps light pulverized coal borne air flow and the dense pulverized coal borne air flow uniformity of coal powder density everywhere separately.
As embodiment preferably or alternatively, central bluff body 21 is rotary body shape, and the axial line of its axial line and Membrane Separator Cylinder for CFB Boiler 1 coincides.
Light pulverized coal borne air flow and the dense pulverized coal borne air flow uniformity of coal powder density everywhere separately can be further guaranteed in this design.
As embodiment preferably or alternatively, along the flow direction of pulverized coal borne air flow, central bluff body 21 comprises flaring conical shell section 211, cylindrical section 212 and the tapered conical cylinder section 213 of mutual smooth connection according to this, and blade 22 is fixedly installed in the circumferential exterior surface of cylindrical section 212.The resistance that this shape causes pulverized coal borne air flow is less, is conducive to rapid flow, the separation of air-flow.
The pulverized coal borne air flow being transported by a distant place (as coal pulverizer) enters the inlet tube 5 of coal dust classifier, and then enters in Membrane Separator Cylinder for CFB Boiler 1.Formed by the tapered cylinder section of flaring, direct tube section, tapered conical cylinder section 213 3 parts at the inner central bluff body 21 of installing of Membrane Separator Cylinder for CFB Boiler 1, under the effect of the tapered cylinder section of flaring and Membrane Separator Cylinder for CFB Boiler 1, the circulation area of pulverized coal borne air flow (or claiming: wind powder mixture) is constantly dwindled, and its flow velocity improves constantly.Then under blade 22 effects that are installed on direct tube section, pulverized coal borne air flow can produce rotating centrifugal centrifugation, the pulverized coal particle that quality is larger is separated under stronger centrifugal action, be thrown toward the inwall side flow near Membrane Separator Cylinder for CFB Boiler 1, the air-flow that suffered centrifugal force is less flows near central bluff body 21.Pulverized coal borne air flow enters after the passage being made up of tapered conical cylinder section 213 and Membrane Separator Cylinder for CFB Boiler 1, along with the increase gradually of aisle spare, its flow velocity reduces gradually, now inertia can continue to keep flowing to constant compared with large most of pulverized coal particles and a part of air-flow and enter concentrated phase outlet 3, the air-flow that inertia is less and and small part coal dust under the guiding of tapered conical cylinder section 213, enter light phase outlet 4, under the effect of elbow, concentrated phase outlet 3 can be turned to, thereby accomplish separating of concentrated phase outlet 3 and light phase outlet 4, facilitate the layout of two outlets, form external coal dust classifier.
As embodiment preferably or alternatively, the influent stream mouth of Membrane Separator Cylinder for CFB Boiler 1 is also connected with inlet tube 5, and pulverized coal borne air flow is entered the influent stream mouth of Membrane Separator Cylinder for CFB Boiler 1 by inlet tube 5, and the internal diameter size of inlet tube 5 increases gradually along the flow direction of pulverized coal borne air flow.Being designed with of inlet tube 5 is beneficial to that air-flow enters Membrane Separator Cylinder for CFB Boiler 1 smoothly and through rotating separation device 2.
As embodiment preferably or alternatively, central bluff body 21 and blade 22 at least one of them outer surface and inlet tube 5, Membrane Separator Cylinder for CFB Boiler 1, concentrated phase outlet 3 and light phase outlet 4 at least one of them inner surface be coated with wear-resistant material layer.Wear-resistant material layer can avoid the coal dust in pulverized coal borne air flow to cause wearing and tearing to the parts in coal dust classifier, improves thus the service life of the utility model coal dust classifier.
As embodiment preferably or alternatively, concentrated phase outlet 3 is bend pipe, and light phase outlet 4 is straight tube, and the entering of flow path direction and himself that go out of concentrated phase outlet 3 exists angle between flow path direction.
Or light phase outlet 4 is bend pipe, concentrated phase outlet 3 is straight tube, and the entering of flow path direction and himself that go out of light phase outlet 4 exists angle between flow path direction.
Or concentrated phase outlet 3 and light phase outlet 4 are bend pipe.Between flow path direction, there is angle in the entering of flow path direction and himself that go out of concentrated phase outlet 3.Between flow path direction, also there is angle in the entering of flow path direction and himself that go out of light phase outlet 4.
The concentrated phase outlet 3 that several embodiments provide above and light phase outlet 4 all can be realized the effect that the light pulverized coal borne air flow producing after deep or light pulverized coal borne air flow detached job and dense pulverized coal borne air flow are drawn respectively.
When light phase outlet 4 is as shown in Figure 3 bend pipe, when concentrated phase outlet 3 is straight tube, the pulverized coal borne air flow being transported by a distant place (as coal pulverizer) enters the inlet tube 5 of coal dust classifier, and then enter in Membrane Separator Cylinder for CFB Boiler 1, then under blade 22 effects that are installed on direct tube section, pulverized coal borne air flow can produce rotating centrifugal centrifugation, the pulverized coal particle that quality is larger is separated under stronger centrifugal action, be thrown toward the inwall side flow near cylindrical shell, the air-flow that suffered centrifugal force is less flows near central bluff body 21.Most of pulverized coal particles that inertia is larger and a part of air-flow can continue to keep flowing to constantly, enter concentrated phase outlet 3 along cylindrical shell flows inside.The air-flow that inertia is less and small part coal dust flow near central bluff body 21, and enter light phase outlet 4 under its guiding, under the effect of elbow, light phase outlet 4 can be turned to, thereby accomplish separating of concentrated phase outlet 3 and light phase outlet 4, facilitate the layout of two outlets, form external coal dust classifier.
As embodiment preferably or alternatively, angle be 0 °～90 ° and do not comprise 0 ° with 90 °.This angle is preferably 30 °～60 °.
In the time that angle is above-mentioned angle value, more conveniently installs, be connected with pulverized-coal fired boiler.
As embodiment preferably or alternatively, on light phase outlet 4, be provided with the adjusting device 6 that can regulate himself circulation area size.By increase adjusting device 6 on light phase outlet 4, can realize the adjusting of main weary gas ratio, be convenient to boiler combustion adjustment.
The pulverized-coal fired boiler that the utility model provides, comprises burner hearth and is positioned at the coal dust classifier that the arbitrary technical scheme of the utility model outside burner hearth provides, wherein:
The head piece that goes out of the concentrated phase outlet 3 as shown in Fig. 1 or Fig. 3 of coal dust classifier is connected with the main gas blowout mouth of a wind of burner hearth.
The head piece that goes out of the light phase outlet 4 of coal dust classifier is connected with the weary gas blowout mouth of burner hearth.
The coal dust classifier that the utility model provides is positioned at and outside burner hearth, has formed external pulverized coal concentrator, breeze airflow is divided into deep or light two strands after external pulverized coal concentrator, thick coal culm air-flow sprays in stove through the main gas blowout mouth of coal burner, thin powdered coal air-flow can cause the upper and lower and right and left of main gas blowout mouth and arrange through blast pipe road, position is flexible and changeable.
To sum up, the rotating centrifugal centrifugation that the utility model utilizes the guiding principle of blade 22 to produce can be separated into the pulverized coal borne air flow of burner inlet the outer dense interior light distribution form of coal dust, forms two strands of air-flows of main weary gas.Can be applicable to the deep or light separation technology field of the defeated powder air-flow of boiler combustion system, the weary gas of master that is particularly useful for a wind of boiler-burner entrance separates and Pulverized Coal Concentration.By this coal dust classifier, pulverized coal borne air flow is divided into deep or light two strands, is conducive to realize the bias combustion thought of boiler.This coal dust classifier is external coal dust separation equipment, and because the weary band of gas has adjusting device 6, can realize the adjusting of main weary gas ratio.The coal dust classifier providing due to the utility model is positioned at outside burner hearth, for example, so can design as required concentrated phase outlet 3 and light phase outlet 4 length and shape (can as required shape be designed to straight tube or bend pipe) separately, can be convenient to main gas near burner hearth main burner arranges, also can facilitate the weary gas of light phase pulverized coal borne air flow to arrange away from burner hearth, position be flexible.
Above-mentioned arbitrary technical scheme disclosed in the utility model unless otherwise stated, if it discloses number range, so disclosed number range is preferred number range, any it should be appreciated by those skilled in the art: preferred number range is only the obvious or representative numerical value of technique effect in many enforceable numerical value.Because numerical value is more, cannot be exhaustive, so the utility model just discloses part numerical value to illustrate the technical solution of the utility model, and the above-mentioned numerical value of enumerating should not form the restriction of the utility model being created to protection domain.
If used the word such as " first ", " second " to limit parts herein, those skilled in the art should know: the use of " first ", " second " is only used to be convenient to describe above parts are distinguished as not having outside Stated otherwise, and above-mentioned word does not have special implication.
Simultaneously, if above-mentioned the utility model discloses or has related to parts or the structural member of connection fastened to each other, so, unless otherwise stated, be fixedly connected with and can be understood as: can dismantle and be fixedly connected with (for example using bolt or screw to connect), also can be understood as: non-removable being fixedly connected with (for example rivet, weld), certainly, connection fastened to each other also can for example, be replaced (obviously cannot adopt except integrally formed technique) by integral type structure (use casting technique is integrally formed to be created).
In addition, in the disclosed arbitrary technical scheme of above-mentioned the utility model applied for the term that represents position relationship or shape unless otherwise stated its implication comprise and its approximate, similar or approaching state or shape.Arbitrary parts that the utility model provides can be both to be assembled by multiple independent parts, the produced separate part of the technique that also can be one of the forming.
Finally should be noted that: above embodiment is only in order to illustrate that the technical solution of the utility model is not intended to limit; Although the utility model is had been described in detail with reference to preferred embodiment, those of ordinary skill in the field are to be understood that: still can modify or part technical characterictic is equal to replacement detailed description of the invention of the present utility model; And not departing from the spirit of technical solutions of the utility model, it all should be encompassed in the middle of the technical scheme scope of the utility model request protection.
Claims (12)
1. a coal dust classifier, is characterized in that, comprises Membrane Separator Cylinder for CFB Boiler, rotating separation device, concentrated phase outlet and light phase outlet, wherein:
Within described rotating separation device is fixedly installed on described Membrane Separator Cylinder for CFB Boiler, described rotating separation device can lead to the pulverized coal borne air flow of process, can be separated into the relatively low light pulverized coal borne air flow of the coal powder density of the axial line position that approaches described Membrane Separator Cylinder for CFB Boiler and the relatively high dense pulverized coal borne air flow of coal powder density between described light pulverized coal borne air flow and described Membrane Separator Cylinder for CFB Boiler under the rotating centrifugal centrifugation that described pulverized coal borne air flow causes in guide effect;
The influent stream mouth of described light phase outlet is positioned at the downstream of described rotating separation device, and the flow direction of described light pulverized coal borne air flow is the influent stream mouth to described light phase outlet just, described light phase outlet is through described Membrane Separator Cylinder for CFB Boiler or described concentrated phase outlet, and the head piece that goes out of described light phase outlet is positioned at outside described Membrane Separator Cylinder for CFB Boiler and described concentrated phase outlet;
The influent stream mouth of described concentrated phase outlet is connected with the head piece that goes out of described Membrane Separator Cylinder for CFB Boiler.
2. coal dust classifier according to claim 1, it is characterized in that, described rotating separation device comprises that central bluff body and the circumferential direction interval along described central bluff body are fixedly installed at least two blades on described central bluff body, under the rotating centrifugal centrifugation causing, can be separated into described light pulverized coal borne air flow and described dense pulverized coal borne air flow through the described pulverized coal borne air flow between described blade, described central bluff body and described Membrane Separator Cylinder for CFB Boiler inwall in the guide effect of described central bluff body and described blade.
3. coal dust classifier according to claim 2, is characterized in that, described blade is to have angle between maximum planes on rectangular slab and described blade and the axial line of described central bluff body; Or described blade is the plate that is provided with cambered surface.
4. coal dust classifier according to claim 3, is characterized in that, described angle is 0 °～90 ° and does not comprise 0 ° and 90 °.
5. coal dust classifier according to claim 2, is characterized in that, described blade is evenly distributed on the outer surface of described central bluff body along the circumferential direction of the axial line of described central bluff body.
6. coal dust classifier according to claim 2, is characterized in that, described central bluff body is rotary body shape, and the axial line of its axial line and described Membrane Separator Cylinder for CFB Boiler coincides.
7. coal dust classifier according to claim 2, it is characterized in that, along the flow direction of described pulverized coal borne air flow, described central bluff body comprises flaring conical shell section, cylindrical section and the tapered conical cylinder section of mutual smooth connection according to this, and described blade is fixedly installed in the circumferential exterior surface of described cylindrical section.
8. coal dust classifier according to claim 2, it is characterized in that, the influent stream mouth of described Membrane Separator Cylinder for CFB Boiler is also connected with inlet tube, described pulverized coal borne air flow is entered the influent stream mouth of described Membrane Separator Cylinder for CFB Boiler by described inlet tube, the internal diameter size of described inlet tube increases gradually along the flow direction of described pulverized coal borne air flow.
9. coal dust classifier according to claim 8, it is characterized in that, described central bluff body and described blade at least one of them outer surface and described inlet tube, described Membrane Separator Cylinder for CFB Boiler, described concentrated phase outlet and described light phase outlet at least one of them inner surface be coated with wear-resistant material layer.
10. coal dust classifier according to claim 1, is characterized in that, described concentrated phase outlet is bend pipe, and described light phase outlet is straight tube, and the entering of flow path direction and himself that go out of described concentrated phase outlet exists angle between flow path direction;
Or described light phase outlet is bend pipe, described concentrated phase outlet is straight tube, and the entering of flow path direction and himself that go out of described light phase outlet exists angle between flow path direction;
Or described concentrated phase outlet and described light phase outlet are bend pipe; Between flow path direction, there is angle in the entering of flow path direction and himself that go out of described concentrated phase outlet; Between flow path direction, also there is angle in the entering of flow path direction and himself that go out of described light phase outlet.
11. according to the arbitrary described coal dust classifier of claim 1-10, it is characterized in that, is provided with the adjusting device that can regulate himself circulation area size on described light phase outlet.
12. 1 kinds of pulverized-coal fired boilers, is characterized in that, comprise burner hearth and are positioned at the arbitrary described coal dust classifier of claim 1-11 outside described burner hearth, wherein:
The head piece that goes out of the described concentrated phase outlet of described coal dust classifier is connected with the main gas blowout mouth of a wind of described burner hearth;
The head piece that goes out of the described light phase outlet of described coal dust classifier is connected with the weary gas blowout mouth of described burner hearth.
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| CN201420365953.3U CN204026721U (en) | 2014-07-03 | 2014-07-03 | Coal dust classifier and pulverized-coal fired boiler |
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| CN201420365953.3U CN204026721U (en) | 2014-07-03 | 2014-07-03 | Coal dust classifier and pulverized-coal fired boiler |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105251602A (en) * | 2015-11-06 | 2016-01-20 | 浙江宜清环境技术有限公司 | Pulverized coal concentration adjusting valve for coal mill of coal pulverizing system |
| CN105387455A (en) * | 2014-09-02 | 2016-03-09 | 阿尔斯通技术有限公司 | A combustion system |
| CN105698167A (en) * | 2016-04-07 | 2016-06-22 | 东方电气集团东方锅炉股份有限公司 | Swirl-flow burning device provided with external separation device |
| CN109681899A (en) * | 2018-12-26 | 2019-04-26 | 上海发电设备成套设计研究院有限责任公司 | Coal even separator and its application method is adjusted in a kind of station boiler |
| CN112682812A (en) * | 2020-12-29 | 2021-04-20 | 锡林郭勒热电有限责任公司 | Pulverized coal distributor |
| CN114408585A (en) * | 2022-01-24 | 2022-04-29 | 润电能源科学技术有限公司 | Gas-solid uniform distribution device for conveying pipeline |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105387455A (en) * | 2014-09-02 | 2016-03-09 | 阿尔斯通技术有限公司 | A combustion system |
| CN105251602A (en) * | 2015-11-06 | 2016-01-20 | 浙江宜清环境技术有限公司 | Pulverized coal concentration adjusting valve for coal mill of coal pulverizing system |
| CN105698167A (en) * | 2016-04-07 | 2016-06-22 | 东方电气集团东方锅炉股份有限公司 | Swirl-flow burning device provided with external separation device |
| CN109681899A (en) * | 2018-12-26 | 2019-04-26 | 上海发电设备成套设计研究院有限责任公司 | Coal even separator and its application method is adjusted in a kind of station boiler |
| CN112682812A (en) * | 2020-12-29 | 2021-04-20 | 锡林郭勒热电有限责任公司 | Pulverized coal distributor |
| CN114408585A (en) * | 2022-01-24 | 2022-04-29 | 润电能源科学技术有限公司 | Gas-solid uniform distribution device for conveying pipeline |
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