CN105797655A - Circulation loop system used for powder and circulation method used for powder - Google Patents
Circulation loop system used for powder and circulation method used for powder Download PDFInfo
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- CN105797655A CN105797655A CN201410854206.0A CN201410854206A CN105797655A CN 105797655 A CN105797655 A CN 105797655A CN 201410854206 A CN201410854206 A CN 201410854206A CN 105797655 A CN105797655 A CN 105797655A
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Abstract
The invention relates to a circulation loop system used for a powder. The system comprises a lifting pipe, a gas and solid separator, a material-returning channel and a control system, wherein the outlet of the lifting pipe is connected with the inlet of the gas and solid separator; one end of the material-returning channel is connected with the outlet of the gas and solid separator, and the other end of the material-returning channel is connected with the inlet of the lifting pipe; the lifting pipe, the gas and solid separator and the material-returning channel are in successive connection to form a circulation loop; the material-returning channel is provided with at least an inflation inlet which is suitable for introducing gas or a powder-and-gas mixture; the structure of the inflation inlet enables the direction of a jet flow to be consistent with the flowing direction of a gas-solid flow from the gas and solid separator to the lifting pipe; and the control system is used for controlling the flow velocity and the flow amount of the gas or the powder-and-gas mixture introduced into the inflation inlet so as to form the jet flow capable of generating negative pressure, and used for controlling the total amount of the introduced gas so as to enable the fluidizing velocity in the lifting pipe to be higher than the terminal settling velocity or the entrainment velocity of the powder. The invention also relates to a circulation method for the powder.
Description
Technical field
The present invention relates to fluidization technology field, especially for the fluo-solid system of powder body.
Technical background
Recirculating fluidized bed, as the efficient gas-solid mixer of one, is widely used to the reaction between gas and granular solid, such as burning of coal, coal gasification, dry, the desulfurizing and purifying of flue gas, oil containing wet solid catalytic cracking etc.；Generally being sequentially connected formed by riser, gas-solid separator, material returning device, solid particle circulates in the closed circuit that this three is constituted；It is provided with air-distribution device bottom riser, blasts fluidized wind, fluidize riser endoparticle；The granule that gas-solid separator is separated by material returning device sends riser back to.
Recirculating fluidized bed rationale here is that the speed difference utilized between gas and solid particle, namely the drag force that the granule of relatively low velocity is produced by the gas of fair speed makes particle flow, and drag force is not only relevant with the speed difference between gas-solid, also relevant with the granularity of granule and density.Geldart delivered famous one section paper (D.Geldart.Typesofgasfluidization [J] .PowderTechnology in 1973,1973 (7): 285-292.), solid particle is divided into ABCD tetra-class according to fluidization character.
So far, circulating fluidized bed technique to B class granule (granularity generally at 100～500 μm, density pp=2500kg/m3) application is the most successful, and to be mainly A class (granularity generally at 30～100 μm, density pp=2500kg/m3) and C class granule (granularity is typically smaller than 30 μm, density pp=2500kg/m3) the application of powder body then still not mature enough.This one of them important factor is returning charge difficulty.Returning charge refers to the process that the solid particle foldback then separated by gas-solid separator goes back to the bottom of riser of being taken out of by gas from riser top, if returning charge can not realize smoothly, then " circulation " cannot set up.The non-mechanical valve being used widely in circulating fluidized bed system at present is best suited for B class particle, comparatively difficult during for A class particle, then very difficult during for C class particle.
The ultimate principle of existing non-mechanical valve returning charge is, the passage utilizing structure special constitutes material returning device, its arrival end is connected with gas-solid separator, its port of export is connected with bottom riser, the solid particle separated by gas-solid separator is piled up in material returning device, under returning charge wind action, then flows into the bottom of riser；Utilize solid particle accumulation in material returning device, vapour lock is formed between the bottom and gas-solid separator of riser, cut off the Negative Pressure Difference between bottom gas-solid separator and riser, making the gas in riser cannot from piggybacking material returning device anti-channeling bottom the higher riser of pressure to the relatively low gas-solid separator of pressure, solid particle can bottom the higher riser of the gas-solid separator returning pressure that pressure is relatively low simultaneously.And owing to the bulk density of A class and C class granule is only small, cannot pass through to be deposited in material returning device and form vapour lock, thus the Negative Pressure Difference between bottom gas-solid separator and riser cannot be cut off completely, cause in riser that gas is easy to anti-channeling to gas-solid separator, so do not simply fail to form returning charge, and destroy the separation of gas-solid separator and the fluidisation of riser.
Summary of the invention
It is an object of the invention to overcome the defect of prior art, it is provided that the closed circuit of a kind of powder body being applicable to mainly be made up of GeldartA class and/or C class particle.
An aspect according to an embodiment of the invention, it is proposed that a kind of closed circuit system for powder body, including: riser；Gas-solid separator, leg outlet is connected with gas-solid separator entrance；Returning charge passage, described returning charge pipeline one end is connected with gas-solid separator solid outlet, the other end is connected with riser entrance, riser, gas-solid separator and returning charge passage connect formation closed circuit successively, described returning charge passage is provided with at least one inflation inlet, described inflation inlet is suitable to blast the mixture of gas or powder body and gas, and inflation inlet is configured so that the direction of jet is consistent with gas-solid flow flow direction from gas-solid separator to riser；And control system, for controlling to blast the flow velocity of the mixture of the gas of inflation inlet or powder body and gas, to form the jet producing negative pressure, and for controlling the flow of gas that blasts so that in riser fluidizing velocity higher than the final Sedimentation Velocity of powder body or carry speed.
Alternatively, returning charge passage includes vertical pipeline section, one section of U-tube section and one section of horizontal pipeline section, and the upper end of vertical pipeline section is connected with the solid outlet of gas-solid separator, and one end of horizontal pipeline section is connected with sidewall bottom riser.Further, bottom the U-tube section of returning charge passage or horizontal pipeline section be provided with described inflation inlet.
Alternatively, one end of returning charge passage is connected with the solid outlet of gas-solid separator, and the other end is bored section with the bottom of riser by one and is connected.Further, returning charge passage is positioned at bottom the pipeline section immediately below riser and is provided with inflation inlet, and described inflation inlet suitably forms jet upwards.Or, it is tilt that returning charge passage is positioned at the pipeline section below gas-solid separator.
Alternatively, one end of returning charge passage is connected with the solid outlet of gas-solid separator, and the other end is connected with sidewall bottom riser.Further, bottom returning charge passage and riser, the returning charge channel outer wall face of sidewall junction is provided with inflation inlet.
Alternatively, returning charge passage is made up of one section of vertical pipeline section and one section of horizontal pipeline section, and the upper end of vertical pipeline section is connected with the solid outlet of gas-solid separator, and one end of horizontal pipeline section is connected with sidewall bottom riser.Further, the vertical pipeline section bottom side wall of returning charge passage, just horizontal pipeline section place is provided with inflation inlet, for forming the horizonally projected jet entering riser.Further, bottom riser, it is provided with inflation inlet, for blasting the mixture of powder body and gas, and forms jet upwards.
Alternatively, returning charge passage is made up of the U-tube section of the homogeneous vertical pipeline section of internal diameter and internal diameter flaring, and the upper end of vertical pipeline section is connected with the solid outlet of gas-solid separator, and the bigger end of internal diameter of U-tube section is connected with bottom riser.Further, the U-tube section of returning charge passage is provided with inflation inlet.
Alternatively, riser is C shape, and returning charge passage is made up of the J-shaped pipeline section that internal diameter is homogeneous, and J-shaped pipeline section upper end is connected with the solid outlet of gas-solid separator, and the J-shaped pipeline section other end is connected with bottom riser.Further, it is provided with inflation inlet bottom riser and returning charge passage junction.
Alternatively, around gas-solid separator twist, returning charge passage totally takes the shape of the letter U riser, and riser one end is connected with the solid outlet of gas-solid separator, and the riser other end is connected with bottom riser.Further, returning charge channel bottom is provided with inflation inlet.
Alternatively, riser is the C shape or horizontal straight tube section that Open Side Down, and the entrance and exit of riser is generally within sustained height, and returning charge passage end is connected with the solid outlet of gas-solid separator, and the returning charge passage other end is connected with riser entrance.Further, returning charge channel bottom and riser entrance joint are provided with inflation inlet.
Alternatively, described returning charge passage or riser are provided with charge door.
Alternatively, inflation inlet directly communicates with carrying the power transportation pipe of the weary gas of coal-grinding and coal dust intermixture in boiler milling system.
According to an embodiment of the invention on the other hand, it is proposed that a kind of powder body round-robin method, including step: providing is connected successively by riser, gas-solid separator and returning charge passage forms closed circuit, and described returning charge passage is provided with at least one inflation inlet；With via inflation inlet to blasting the mixture of gas or powder body and gas in closed circuit to form the jet producing negative pressure, the direction of the jet formed is consistent with gas-solid flow flow direction from gas-solid separator to riser, and controls the flow of gas that blasts so that fluidizing velocity higher than the final Sedimentation Velocity of powder body or carries speed in riser.
Alternatively, said method further comprises the steps of: and adds powder body via the charge door on returning charge passage or riser in closed circuit.
Present invention eliminates cannot normal use in the conventional material returning device of A class and C class particle, overcoming the recirculating fluidized bed that thus brings cannot the defect of reliable and stable operation, it is provided that a kind of New Cycle loop that can be used for powder body, simple in construction, runs easy and simple to handle.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the closed circuit system for powder body of the embodiment of the present invention 1.
Fig. 2 is the schematic diagram of the closed circuit system for powder body of the embodiment of the present invention 2.
Fig. 3 is the schematic diagram of the closed circuit system for powder body of the embodiment of the present invention 3.
Fig. 4 is the schematic diagram of the closed circuit system for powder body of the embodiment of the present invention 4.
Fig. 5 is the schematic diagram of the closed circuit system for powder body of the embodiment of the present invention 5.
Fig. 6 is the schematic diagram of the closed circuit system for powder body of the embodiment of the present invention 6.
Fig. 7 is the schematic diagram of the closed circuit system for powder body of the embodiment of the present invention 7.
Fig. 8 is the schematic diagram of the closed circuit system for powder body of the embodiment of the present invention 8.
Fig. 9 is the schematic diagram of the closed circuit system for powder body of the embodiment of the present invention 9.
Detailed description of the invention
By the examples below, and in conjunction with accompanying drawing, technical scheme is described in further detail.In the description, same or analogous drawing reference numeral indicates same or analogous parts.Following it is intended to the explanation of embodiment of the present invention with reference to accompanying drawing the present general inventive concept of the present invention is made an explanation, and is not construed as a kind of restriction to the present invention.
The closed circuit system for GeldartA class and/or C class powder body of the present invention, including the riser being sequentially connected, gas-solid separator and returning charge passage.
Tubular and the layout of riser is unrestricted, and internal gas need only be kept unimpeded with the flowing of powder body, both can be conventional vertical cylindrical chamber (axis is perpendicular to horizontal plane), it is also possible to sweep, even twist；Both can being vertical state on the whole, gas-solid is bottom-up flowing wherein, it is also possible to be locally even all not orthogonal to horizontal plane, even generally horizontally disposed.In the present invention, bottom riser, do not set conventional air-distribution device, such as the air distribution plate with air compartment and blast cap, or wind-distributing pipe etc.；Only when inflation inlet is arranged at the intersection of returning charge passage and riser, seem to be provided with bottom riser air-distribution device, but the gas that inflation inlet now blasts or gas-solid mixture not only act as the effect of the material promoted in riser, also have the effect of fluidized material in injection returning charge passage, therefore this inflation inlet those air-distribution devices non-concurrently.
Gas-solid separator is conventionally form, and leg outlet is connected with gas-solid separator entrance, and gas-solid separator solid outlet is connected with bottom riser by returning charge passage.
Returning charge passage is the passage that internal diameter is variable, and shape is unrestricted, and one end is connected with the solid outlet of gas-solid separator, and the other end is connected with riser entrance.Returning charge passage is provided with one or more inflation inlet, is blasted the mixture of gas or powder body and gas by inflation inlet, forms the jet that can manufacture negative pressure, and jet direction is consistent with the solid particle flow direction in returning charge passage.Under the suction function that jet manufactures, entering riser through returning charge passage until flowing into gas-solid separator from leg outlet from gas-solid separator solid outlet, the intrasystem powder body of closed circuit and gas all keep co-flow.When returning charge passage is provided with multiple inflation inlet, it is possible to partial inflation mouth is used for blasting gas, all the other inflation inlets are for blasting the mixture of powder body and gas.
Powder body passes through inflation inlet in the way of gas-solid mixture, namely air conveying mode, adds closed circuit system；The charge door that powder body can also pass through to be arranged on returning charge passage or riser adds closed circuit system.
The amount of the gas blasted by inflation inlet must make fluidizing velocity in riser higher than the final Sedimentation Velocity of powder body or carry speed: when riser is generally perpendicular to horizontal plane, for the final Sedimentation Velocity higher than powder body, when part or all of riser is not orthogonal to horizontal plane, for carrying speed higher than powder body.
In the conventional recirculating fluidized bed with material returning device, the power of Matter Transfer mostlys come from the fluidized wind blasted bottom riser, riser base pressure raises, along riser upwards then pressure be gradually lowered, to gas-solid separator export time pressure minimum, and along with granule accumulation in material returning device forms stock column, pressure rises, higher than bottom riser, in material returning device, now pass into returning charge wind, send solid particle back to riser.In this process, granule in riser is except flowing up with fluidized wind, also has downward back-mixing, returning charge wind in material returning device also has and partially passes through the stock column of material returning device, anti-channeling enters gas-solid separator, and therefore the solid particle in regular circulation fluid bed is always not identical with the flow direction of gas.
Present invention eliminates the material returning device of routine, also eliminate the fluidized wind bottom riser simultaneously, utilize the fluidic vectoring thrust negative pressure of gas or the gas-solid mixture blasted by inflation inlet, order about material and flow along jet direction.Blasting gas-solid mixture by inflation inlet is preferred mode, being possible not only to provide higher momentum of impinging jet, the gas-solid being more favorable to improve closed circuit system blends efficiency, and the gas-solid mixture blasted directly adopts air conveying powder body, inflate and feed in raw material and unite two into one, simplify system.
When inflation inlet only blasts gas, powder body can add from the charge door being arranged at riser or returning charge passage.Owing in regular circulation fluid bed, bulky grain cannot pass through material returning device, so granule can not be added between gas-solid separator and material returning device, but the powder body closed circuit system of the present invention does not have material returning device, powder body can add from any position returning charge passage, the space blending and reacting is made to have been expanded to returning charge passage and riser by original riser, for the closed circuit system needing the identical time of staying, the overall height of the present invention can be greatly lowered；Further, the riser of the present invention and returning charge passage are all no longer by the restriction of conventional design, it is not necessary to keep vertically, in order to reduce total height further, it is also possible to adopt the even spiral riser of shaped form and returning charge passage.
Below in conjunction with accompanying drawing, the present invention is further detailed.
Embodiment 1
The closed circuit system for A class and/or C class powder body as shown in Figure 1, it is connected in sequence by riser 1, gas-solid separator 2 and returning charge passage 3, wherein returning charge passage 3 includes vertical pipeline section, one section of U-tube section and one section of horizontal pipeline section, the upper end of vertical pipeline section is connected with the solid outlet of gas-solid separator 2, and one end of horizontal pipeline section is connected with sidewall bottom riser 1.
It is provided with inflation inlet 4 bottom the U-tube section of returning charge passage 3, for blasting the coal dust of the weary gas conveying of coal-grinding, coal particle size is less than 200 μm, make to form jet bottom U-tube section, cause local decompression, and make the powder body in the vertical pipeline of returning charge passage 3 flow from top to bottom, after U-tube section and horizontal pipeline section, enter riser.In the coal dust blasted by inflation inlet 4 and the mixture of the weary gas of coal-grinding, weary tolerance is make the void tower fluidizing velocity in riser reach 1.5m/s, exceedes the final Sedimentation Velocity of coal dust.Now, in whole closed circuit system, powder body and gas all keep clockwise flow (from front view) from gas-solid separator solid outlet through returning charge passage to leg outlet, it does not have adverse current section.
Alternatively, inflation inlet 4 can also be arranged on the horizontal pipeline section of returning charge passage 3, and inflation direction is the clockwise direction on front view.
In the present embodiment, U-tube section is similar to U-shaped material returning device profile, and the two also differs.Loosening wind that the descending branch of U-shaped material returning device is different with each leading into flow bottom the ascent stage and fluidized wind, stock column fluidisation that loosening wind is mainly used in making descending branch pile up, in downward moving bed, part loosens wind and can pass through stock column, enter the gas-solid separator at its top.In the present embodiment, the inflation inlet 4 that U-shaped duct bottom is arranged has to comply with the requirement of " inflation inlet is configured so that the direction of jet is consistent with gas-solid flow flow direction from gas-solid separator to riser ", and this inflation inlet can not blast the loosening wind of conventional U-shaped material returning device.
Embodiment 2
The closed circuit system for powder body as shown in Figure 2, it is connected in sequence by riser 1, gas-solid separator 2 and returning charge passage 3, wherein one end of returning charge passage 3 is connected with the solid outlet of gas-solid separator 2, and the other end is bored section with the bottom of riser 1 by one and is connected.
Returning charge passage 3 is positioned at bottom the pipeline section immediately below riser 1 and is provided with inflation inlet 4, for blasting the mixture of powder body and gas, forms jet upwards, causes local decompression, makes the powder body in returning charge passage 3 enter riser.The tolerance blasted by inflation inlet 4 makes the fluidizing velocity in riser exceed the final Sedimentation Velocity of powder body.Owing to the driving force of the powder flowing in returning charge passage 3 is not the stock column pressure in regular circulation fluid bed, therefore returning charge passage 3 is positioned at the pipeline section below gas-solid separator 2 and need not keep vertical, can being tilt pipeline section, this be conducive to carrying out the compact design reducing closed circuit system bulk.
Embodiment 3
As shown in Figure 3 be a kind of overall compact closed circuit system for powder body, it is connected in sequence by riser 1, gas-solid separator 2 and returning charge passage 3, wherein one end of returning charge passage 3 is connected with the solid outlet of gas-solid separator 2, and the other end is connected with sidewall bottom riser 1.
Bottom returning charge passage 3 and riser 1, the returning charge channel outer wall face of sidewall junction is provided with inflation inlet 4, is used for blasting gas, and riser 1 is provided with charge door 5, is used for adding powder body.
Blast gas by inflation inlet 4, formed from returning charge passage to the jet of riser, it is provided that powder body flows to the power of riser along returning charge passage 3, and makes the powder body in riser flow up under exceeding terminal velocity, enter gas-solid separator 2.
Embodiment 4
The closed circuit system for powder body as shown in Figure 4, it is connected in sequence by riser 1, gas-solid separator 2 and returning charge passage 3, wherein returning charge passage 3 is made up of one section of vertical pipeline section and one section of horizontal pipeline section, the upper end of vertical pipeline section is connected with the solid outlet of gas-solid separator 2, and one end of horizontal pipeline section is connected with sidewall bottom riser 1.
The vertical pipeline section bottom side wall of returning charge passage 3, just horizontal pipeline section place is provided with inflation inlet 4, is used for blasting gas, formed from front view jet to the left, make powder body flow to the left, enter riser.It is provided with inflation inlet 4 bottom riser, for blasting the mixture of powder body and gas, and forms jet upwards, it is further provided the power of Matter Transfer.
Embodiment 5
The closed circuit system for powder body as shown in Figure 5, it is connected in sequence by riser 1, gas-solid separator 2 and returning charge passage 3, wherein returning charge passage 3 is made up of the U-tube section of the homogeneous vertical pipeline section of internal diameter and internal diameter flaring, the upper end of vertical pipeline section is connected with the solid outlet of gas-solid separator 2, and the bigger end of internal diameter of U-tube section is connected with bottom riser 1.
The vertical pipeline section of returning charge passage 3 is provided with charge door 5, is used for adding powder body；The U-tube section of returning charge passage 3 is provided with inflation inlet 4, is used for blasting gas, and is formed from the clockwise jet of front view, makes powder body and gas and all keep clockwise flow from gas-solid separator solid outlet through returning charge passage to leg outlet.
Embodiment 6
The closed circuit system for powder body as shown in Figure 6, it is connected in sequence by riser 1, gas-solid separator 2 and returning charge passage 3, wherein riser is C shape, returning charge passage 3 is made up of the J-shaped pipeline section that internal diameter is homogeneous, upper end is connected with the solid outlet of gas-solid separator 2, and the other end is connected with bottom riser 1.
It is provided with inflation inlet bottom riser and returning charge passage junction, for blasting the mixture of powder body and gas, is formed to upper left jet (from front view), make the powder body in returning charge passage and riser and gas clockwise flow.
Owing to riser is C shape, when highly identical, fluidizing velocity is identical, material extended residence time in riser.
Embodiment 7
The closed circuit system for powder body as shown in Figure 7, being connected in sequence by riser 1, gas-solid separator 2 and returning charge passage 3, wherein riser is spiral type, and returning charge passage 3 totally takes the shape of the letter U, one end is connected with the solid outlet of gas-solid separator 2, and the other end is connected with bottom riser 1.
Returning charge channel bottom is provided with inflation inlet 4, and for blasting the mixture of powder body and gas, and formation flows to the jet bottom riser from returning charge passage, drives the flowing of powder body, and makes powder body with flowing up higher than terminal velocity in riser.
Owing to riser is spiral type, reduce the volume of closed circuit system on the one hand, also provide longer residence time of material simultaneously.
Embodiment 8
The closed circuit system for powder body as shown in Figure 8, it is connected in sequence by riser 1, gas-solid separator 2 and returning charge passage 3, wherein riser is the C shape that Open Side Down, namely entrance and exit is generally within sustained height, returning charge passage 3 one end is connected with the solid outlet of gas-solid separator 2, and the other end is connected with riser 1 entrance.
Returning charge channel bottom and riser entrance joint are provided with inflation inlet 4, for blasting the main mixture by GeldartA class and the molecular powder body of C class grain and gas, and form the jet flowing to riser from returning charge passage, drive the flowing of powder body, and make powder body to carry speed flowing higher than powder body in riser.
Alternatively, riser can also be horizontal straight tube section, as shown in Figure 9.
One of characteristic due to A class and C class powder body is that the power of influence (drag force) of the gas carrying its flowing secretly is much larger than gravity, therefore a small amount of gas is discharged with powder body from the solid outlet of gas-solid separator, is entered returning charge passage, separator is no longer necessary to lean on gravity discharge, because without being vertically arranged, the conventional cyclones horizontal positioned in this example remains to normal operation.
Although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, being appreciated that and can these embodiments be changed without departing from the principles and spirit of the present invention, the scope of the present invention be defined by the appended.
Claims (23)
1. for a closed circuit system for powder body, including:
Riser；
Gas-solid separator, leg outlet is connected with gas-solid separator entrance；
Returning charge passage, described returning charge pipeline one end is connected with gas-solid separator solid outlet, the other end is connected with riser entrance, riser, gas-solid separator and returning charge passage connect formation closed circuit successively, described returning charge passage is provided with at least one inflation inlet, described inflation inlet is suitable to blast the mixture of gas or powder body and gas, and inflation inlet is configured so that the direction of jet is consistent with gas-solid flow flow direction from gas-solid separator to riser；And
Control system, for controlling to blast the flow velocity of the mixture of the gas of inflation inlet or powder body and gas, to form the jet producing negative pressure, and for controlling the flow of gas that blasts so that in riser fluidizing velocity higher than the final Sedimentation Velocity of powder body or carry speed.
2. closed circuit system according to claim 1, wherein:
Returning charge passage includes vertical pipeline section, one section of U-tube section and one section of horizontal pipeline section, and the upper end of vertical pipeline section is connected with the solid outlet of gas-solid separator, and one end of horizontal pipeline section is connected with sidewall bottom riser.
3. closed circuit system according to claim 2, wherein:
Bottom the U-tube section of returning charge passage or horizontal pipeline section be provided with described inflation inlet.
4. closed circuit system according to claim 1, wherein:
One end of returning charge passage is connected with the solid outlet of gas-solid separator, and the other end is bored section with the bottom of riser by one and is connected.
5. closed circuit system according to claim 4, wherein:
Returning charge passage is positioned at bottom the pipeline section immediately below riser and is provided with inflation inlet, and described inflation inlet suitably forms jet upwards.
6. closed circuit system according to claim 4, wherein:
It is tilt that returning charge passage is positioned at the pipeline section below gas-solid separator.
7. closed circuit system according to claim 1, wherein:
One end of returning charge passage is connected with the solid outlet of gas-solid separator, and the other end is connected with sidewall bottom riser.
8. closed circuit system according to claim 7, wherein:
Bottom returning charge passage and riser, the returning charge channel outer wall face of sidewall junction is provided with inflation inlet.
9. closed circuit system according to claim 1, wherein:
Returning charge passage is made up of one section of vertical pipeline section and one section of horizontal pipeline section, and the upper end of vertical pipeline section is connected with the solid outlet of gas-solid separator, and one end of horizontal pipeline section is connected with sidewall bottom riser.
10. closed circuit system according to claim 9, wherein:
The vertical pipeline section bottom side wall of returning charge passage, just horizontal pipeline section place is provided with inflation inlet, for forming the horizonally projected jet entering riser.
11. closed circuit system according to claim 10, wherein:
It is provided with inflation inlet bottom riser, for blasting the mixture of powder body and gas, and forms jet upwards.
12. closed circuit system according to claim 1, wherein:
Returning charge passage is made up of the U-tube section of the homogeneous vertical pipeline section of internal diameter and internal diameter flaring, and the upper end of vertical pipeline section is connected with the solid outlet of gas-solid separator, and the bigger end of internal diameter of U-tube section is connected with bottom riser.
13. closed circuit system according to claim 12, wherein:
The U-tube section of returning charge passage is provided with inflation inlet.
14. closed circuit system according to claim 1, wherein:
Riser is C shape, and returning charge passage is made up of the J-shaped pipeline section that internal diameter is homogeneous, and J-shaped pipeline section upper end is connected with the solid outlet of gas-solid separator, and the J-shaped pipeline section other end is connected with bottom riser.
15. closed circuit system according to claim 14, wherein:
It is provided with inflation inlet bottom riser and returning charge passage junction.
16. closed circuit system according to claim 1, wherein:
Around gas-solid separator twist, returning charge passage totally takes the shape of the letter U riser, and riser one end is connected with the solid outlet of gas-solid separator, and the riser other end is connected with bottom riser.
17. closed circuit system according to claim 16, wherein:
Returning charge channel bottom is provided with inflation inlet.
18. closed circuit system according to claim 1, wherein:
Riser is the C shape or horizontal straight tube section that Open Side Down, and the entrance and exit of riser is generally within sustained height, and returning charge passage end is connected with the solid outlet of gas-solid separator, and the returning charge passage other end is connected with riser entrance.
19. closed circuit system according to claim 18, wherein:
Returning charge channel bottom and riser entrance joint are provided with inflation inlet.
20. the closed circuit system according to any one of claim 1-19, wherein:
Described returning charge passage or riser are provided with charge door.
21. the closed circuit system according to any one of claim 1-19, wherein:
Inflation inlet directly communicates with carrying the power transportation pipe of the weary gas of coal-grinding and coal dust intermixture in boiler milling system.
22. a powder body round-robin method, including step:
Thering is provided is connected successively by riser, gas-solid separator and returning charge passage forms closed circuit, and described returning charge passage is provided with at least one inflation inlet；With
Via inflation inlet to blasting the mixture of gas or powder body and gas in closed circuit to form the jet producing negative pressure, the direction of the jet formed is consistent with gas-solid flow flow direction from gas-solid separator to riser, and controls the flow of gas that blasts so that fluidizing velocity higher than the final Sedimentation Velocity of powder body or carries speed in riser.
23. method according to claim 22, including step:
In closed circuit, powder body is added via the charge door on returning charge passage or riser.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108940138A (en) * | 2018-07-23 | 2018-12-07 | 新奥科技发展有限公司 | A kind of fluidized-bed catalytic reactor |
| CN112833415A (en) * | 2019-11-25 | 2021-05-25 | 中国科学院工程热物理研究所 | Pulverized coal preheating device and pulverized coal combustion system with same |
| CN114251954A (en) * | 2020-09-24 | 2022-03-29 | 国家能源投资集团有限责任公司 | Powder heating equipment and heating method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108940138A (en) * | 2018-07-23 | 2018-12-07 | 新奥科技发展有限公司 | A kind of fluidized-bed catalytic reactor |
| CN112833415A (en) * | 2019-11-25 | 2021-05-25 | 中国科学院工程热物理研究所 | Pulverized coal preheating device and pulverized coal combustion system with same |
| CN114251954A (en) * | 2020-09-24 | 2022-03-29 | 国家能源投资集团有限责任公司 | Powder heating equipment and heating method thereof |
| CN114251954B (en) * | 2020-09-24 | 2024-03-29 | 国家能源投资集团有限责任公司 | Powder heating equipment and heating method thereof |
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| CN105797655B (en) | 2018-01-12 |
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