CN1188532A - Device for separating solids particles from gas flow of fluid bed - Google Patents
Device for separating solids particles from gas flow of fluid bed Download PDFInfo
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- CN1188532A CN1188532A CN97190313A CN97190313A CN1188532A CN 1188532 A CN1188532 A CN 1188532A CN 97190313 A CN97190313 A CN 97190313A CN 97190313 A CN97190313 A CN 97190313A CN 1188532 A CN1188532 A CN 1188532A
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Abstract
The invention concerns a device for separating solids particles from a gas flow of a circulating fluid bed reactor (1), the solids particles being conveyed in this gas flow. Means are provided which influence the gas flow such that centrifugal and gravitational forces which are greater than the gas flow entrainment forces act on the solids particles, so enabling particles of a given minimum size to be separated from the gas flow. According to the invention, the structure of the circulating fluid bed plant is rendered particularly compact in that the gas flow leaving the circulating fluid bed reactor (1) passes to a flow duct (4) which guides said flow about a horizontal cyclone axis (16) on a circular arc (17) in the downward direction. From here, the gas flow is delivered to a transfer duct (7) suitable for conveying it further. In the vertical direction the flow duct (4) merges into a separation chamber (15) which widens in corresponding manner at the bottom and in which the separated solids particles drop to the bottom.
Description
The present invention relates to claim 1 preamble, by carrying the separation equipment of isolating solid particle in the combustion chamber air-flow that solid particle flows.
The CFB device utilizes recirculating fluidized bed (CFB) reactor.In this case, a large amount of fine-grained solids particles that add to the combustion chamber are that primary air is from flowing through down.When forming fluid bed, the gravity of solid particle is by the counterforce counteraction of air-flow.A part solid particle flow out fluidized-bed reactor with air-flow, by optional equipment by removing solid particle in the air-flow, with the solid circulation of guaranteeing that technical process is required.
Known use is called centrifugation device separate solid particles from the air-flow of discharging of cyclone separator.The principle of centrifugation is based on centrifugal action.By gas/solid mixture is quickened to fall on the circular trace around the cyclone separator longitudinal axis, produce with varying strength and act on the gas component in the air-flow and the centrifugal force of solid constituent.Centrifugal force increases with the increase of granular size, and particle begins to be deposited from a certain particle diameter as a result.Than the littler particle of so-called separating particles with air current flow.Thrown Yu Bishang than the solid particle that the separating particles of whirlwind separator is big, landing downwards is to solid outlet.Air-flow and score are flowed out cyclone separator from the central opening that the little solid particle of particle passes through the top.
Particularly in cyclone separator under the situation of a large amount of solids of air-flow load, the effect of centrifugation effect is covered consumingly by the quality precipitation, that is to say in the air-flow that a large amount of particles do not rotate repeatedly around the cyclone separator longitudinal axis, but after entering cyclone separator immediately from downward solid pipeline form to falling to solid outlet.Only there is more a spot of solid particle from air-flow, to separate by the centrifugation effect.
The conventional structure cyclone separator that is used for the CFB system is very big, very heavy structure, for reaching abundant thermal insulation and guaranteeing not being hit property solid particle erosion, needs a large amount of masonry structures.These a large amount of masonry structures heating has at leisure only also just caused the CFB system starting time long.The service life that starting and brake operating have reduced outside masonry structure.And, because the thermal expansion amount of cyclone separator, combustion chamber and boiler convection part and direction is different, in the structure of conventional cyclone separator, need expensive compensator.
The separation equipment that the purpose of this invention is to provide claim 1 preamble, it has realized the purpose of as close as possible combustor exit deposition solid particle from discharge air-flow, so make can with the combustion chamber, and if suitablely also combine closely with other functional element.
This purpose reaches by means of the character of expression in the claims.The suitable formation of theme of the present invention and in-depth specify in appended claims.
By the present invention, directly pass to flow channel from the air-flow of combustion chamber, flow channel is directed at the bottom with air-flow along the circular arc around the cyclone separator trunnion axis from the top.Flow channel is expansion downwards vertically, incorporates the separation chamber into, the sedimentation in the separation chamber of the solid particle of deposition.The air communication that purifies is to the receive path that is suitable for continuing to carry it.
Owing to have the event of structure of this flow channel of horizontally extending cyclone separator axle, solid particle flow to flow channel along shortest path certain a bit, flow channel is constantly expansion during this period, incorporates the separation chamber at more described place, and the separation chamber is therefore near the combustion chamber.This layout makes very compact structure, but also reaches solid particle very effective separation from discharge air-flow simultaneously, because incorporate the effect that the inlet of separation chamber is lighted diffuser into.The gravity and the centrifugal force that act on the heavy solid particle can not flow until reaching receive path heavy solid particle with the air-flow of discharging on the circular arc that makes progress, particle slips into the separation chamber downwards as a result.
In a kind of favourable in-depth of theme of the present invention, flow channel attenuates gradually continuously up to the inlet of separator, to realize that air-flow quickens continuously.In the porch, separation chamber, air-flow is by the enlarged retardation and the deflection of the similar diffuser of flow channel, and energy of flow utilizes with the pressure form again as a result.
Equally significantly, when air-flow deflects in diffuser, not with the solid particle back-mixing that has separated.A kind of effective method is that the inlet of receive path is arranged to fully outlet away from flow channel, and purpose is to make the air-flow inflection point of also should flowing through, and it is upwards mobile again the inflection point after.
Though in the cyclone separator of routine, solid particle rotates around the vertical axes of cyclone separator repeatedly with air-flow, but with regard to this equipment, when air-flow is circulated to the receive path inlet around the cyclone separator trunnion axis, formation is corresponding to a part of circumference of rotation less than 360 degree, and this is just enough.
Particularly advantageously for whole structure be that the space that is positioned at the circular arc inboard is used for the coaxial mounted receive path of axle with cyclone separator.
In order to receive the air-flow of the solid particle that removes separation, on receive path, must offer receiving port.For this reason, the first kind of scheme that can imagine is that the axle of receiving port and cyclone separator extends in parallel, and the bottom is over against the separation chamber.To be receiving port vertical with the axle of cyclone separator or extend with an angle for second kind of scheme.
As combustion chamber and separation chamber are integrated with a fundamental reaction device unit mutually, and establish dividing plate between them, their top is connected by the receive path of separation chamber's one side, has obtained a kind of special compact structure like this.
The structure of flow channel is simplified, and this is because in fact when forming it and without other inner member: on the one hand, adopt the outer surface of receive path, the inboard of adopting fundamental reaction device unit outer wall on the other hand.The stenosis of air-flow in the flow channel before separation chamber inlet reaches maximal rate.The speed of 10 to 60 meter per seconds is particularly conducive to separating particles.
Receive path is directly installed on the downstream of combustor exit, not only makes compact combination the between combustion chamber and the separation chamber, and convection section is directly linked to each other.As a result, also convection section can be incorporated into the fundamental reaction device unit that comprises separation chamber and combustion chamber, another dividing plate just is located between separation chamber and the convection section like this.
Can save the required compensator of popular response device, this is owing to all walls in the fundamental reaction device unit all make the next door that band transports the pipe of boiling water, has so just stoped unallowed thermal stress.
Separation chamber of the present invention preferably is provided for the recirculating fluidized bed heating furnace with the combustion chamber.Because compact conformation, the solid particle at separation chamber's bottom section that deposition is come out from discharge air-flow can import the combustion chamber through short path again by return port.
Exemplary embodiment of the present invention is shown in the drawings, and is described in more detail below.
Fig. 1 represents reactor side-looking subregion block diagram, towards combustion chamber and separation chamber;
Fig. 2 represents along the sectional view of Fig. 1 section A-A line;
Fig. 3 represents to have the reactor part block diagram of Fig. 1 of improved receive path; With
Fig. 4 represents along the sectional view of Fig. 3 section B-B line.
The block diagram of greatly simplifying of Fig. 1 to 4 can be found out, CFB reactor 1, and separation chamber 15 and convection section 11 are in conjunction with incorporating fundamental reaction device unit into.Granular solids imports reactor 1, and reverberates by adding primary air 2, and desired response takes place.Because the speed of air-flow is faster than the sinking speed of solid particle in the combustion chamber, therefore a part of solid particle is carried secretly by air-flow, and draws off from the CFB reactor.
Be right after in the combustion chamber 1 downstream, air-flow arrives the inlet 3 of flow channel 4, and flow channel 4 is formed by the inboard of outer wall 5 and the outside of receive path 4 walls 6.Flow channel 4 streamwises are tapered, and cause air-flow to quicken continuously like this, are that the stenosis 8 of X reaches the fastest at area of section.Area X is chosen to, and making herein, flow velocity is 10 to 60 meter per seconds.
In the downstream of stenosis 8, flow channel 4 is 15 openings towards the separation chamber.Cross section enlarges the diffuser effect retardation air-flow that produces, and air-flow is simultaneously along arc 17 deflections.In this process, gas separates with solid, this be because, because their effect of inertia, can not be than the solid particle that the separating particles of whirlwind distractor-type equipment is big along with deflecting.For example contingent back mixing is prevented from by this equipment in conventional cyclone separator.Landing to the solid of separation chamber's outer wall 9 no longer can be carried by air-flow.Therefore, what solid particle flow to separation chamber's 15 bottom sections returns opening 10, and sends into the CFB reactor thus again.Because CFB reactor 1 must be with respect to separation chamber's 15 sealings, therefore for example available cyclone separator (not showing out at this) operation that is installed in the bottom, separation chamber.
Therefore gas component in the air-flow and score by leaving separation chamber 15 at horizontal receive path 7, and flow into the convection section 11 of system from the little solid particle of particle.Particularly shown in Fig. 2 and 4, can imagine two kinds of schemes that make up the charge door 14-18 in the receive path 7.In the scheme of Fig. 1 and 2, end at the front of separation chamber's 1 vertical outer wall with cyclone separator axle 16 coaxial mounted tubular type receive paths, and form its charge door 18 at this.In this case, the surface of opening can vertically be extended, or rotates an angle, with the funnel type opening of described outer wall formation towards the separation chamber.In the embodiment of Fig. 3 and 4, charge door preferably makes dividing plate 13a and CFB reactor 1 direct neighbor by forming along the horizontally extending space of receive path 7 shell surfaces.
Stenosis (8) outer wall (9) return port (10) convection section (11) area of heating surface (12) first dividing plate (13a) second partition (13b) charge door (14) separation chamber (15) receive path (16) arc (17) charge doors (18) of reference symbol table CFB reactor (1) primary air (2) entrance (3) flow channel (4) outer wall (5) receive path wall (6) receive path (7)
Claims (14)
1. the separation equipment that from CFB reactor (1) air-flow that carries solid particle, separates these particles, such equipment that influences air-flow wherein is provided, make that centrifugal force and the gravity bigger than air-flow entrainment force acts on the solid particle, particle with certain minimum dimension can be separated from air-flow, it is characterized in that arriving flow channel (4) from the air-flow of CFB reactor (1), flow from the top down around cyclone separator trunnion axis (16) along circular arc (17) by passage (4) guiding, and air-flow flow to from here and is fit to the receive path (7) that it continues circulation, and its feature also is suitably expansion downwards of flow channel (4), and in the vertical direction is incorporated the separation chamber (15) that the solid particle of deposition sinks therein into.
2. according to the separation equipment of claim 1, it is characterized in that flow channel (4) is tapered until the inlet (8) that arrives separation chamber (15), to obtain the continuous acceleration of air-flow, plays diffuser then.
3. according to the separation equipment of claim 2, it is characterized in that air-flow deflects in diffuser, make not have back mixing with the solid particle that has separated.
4 according to each separation equipment in the above claim, it is characterized in that air-flow centers on cyclone separator trunnion axis (16) circulation and constituted an arc that is equivalent to rotate less than 360 degree until the process of the inlet of receive path (7).
5. according to each separation equipment in the above claim, it is characterized in that the coaxial circular arc (17) that is positioned at of receive path (7) and cyclone separator axle (16).
6. according to each separation equipment in the above claim, it is characterized in that in receive path (7), providing be parallel to that cyclone separator axle (16) stretches and the bottom over against the separation chamber receiving port (14) of (15), to receive the air-flow of the solid particle that has removed separation.
7. according to each separation equipment in the claim 1 to 6, it is characterized in that providing in the receive path (7) perpendicular to cyclone separator axle or the receiving port (18) that extends at an angle with it.
8. according to each separation equipment in the above claim, it is characterized in that CFB reactor and separation chamber (15) integrate with a fundamental reaction device unit each other, a dividing plate (13a) is arranged between them, and (15) one sides link to each other with receive path (7) in the separation chamber in the upper end of dividing plate.
9. according to the separation equipment of claim 2, it is characterized in that receive path (7) forms flow channel (4) with the outer wall (5) of fundamental reaction device unit.
10. according to the separation equipment of claim 9, it is characterized in that air-flow in flow channel (4), the stenosis in the separation chamber before (15) inlet reaches maximal rate, and described speed is 10 to 60 meter per seconds.
11. according to each separation equipment in the above claim, it is characterized in that receive path (7) separation chamber (15) and the air-flow that purifies therein the convection section of release heat (11) link to each other.
12., it is characterized in that convection section (11) and fundamental reaction device unit are an integral body, and have another dividing plate (13b) to be positioned between separation chamber (15) and the convection section (11) according to the separation equipment of claim 11.
13. each separation equipment in 12 according to Claim 8, it is characterized in that at least one dividing plate (13a, 13b) is built into the next door of transporting boiling water in the fundamental reaction device unit, and other wall of fundamental reaction device unit, preferably all walls are incorporated the water/vapour cycle of boiler into.
14. according to each separation equipment in the above claim, it is characterized in that being provided for adopting the reative cell of the method for recirculating fluidized bed, and the solid particle of separating flows into CFB reactor (1) at separation chamber's bottom section again by return port (10) from air-flow.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97190313A CN1188532A (en) | 1996-02-08 | 1997-02-03 | Device for separating solids particles from gas flow of fluid bed |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19604565.7 | 1996-02-08 | ||
| CN97190313A CN1188532A (en) | 1996-02-08 | 1997-02-03 | Device for separating solids particles from gas flow of fluid bed |
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| Publication Number | Publication Date |
|---|---|
| CN1188532A true CN1188532A (en) | 1998-07-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97190313A Pending CN1188532A (en) | 1996-02-08 | 1997-02-03 | Device for separating solids particles from gas flow of fluid bed |
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| CN (1) | CN1188532A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100354038C (en) * | 2005-11-09 | 2007-12-12 | 华东理工大学 | Continuous fluidized bed for gas phase preparing silicon dioxide and its industrial application |
| CN101716481B (en) * | 2010-01-21 | 2012-05-09 | 上海交通大学 | Hypergravity fluidization vapor deposition reaction device |
| CN115090223A (en) * | 2017-02-20 | 2022-09-23 | 努斯有限责任公司 | Fluidized bed system |
-
1997
- 1997-02-03 CN CN97190313A patent/CN1188532A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100354038C (en) * | 2005-11-09 | 2007-12-12 | 华东理工大学 | Continuous fluidized bed for gas phase preparing silicon dioxide and its industrial application |
| CN101716481B (en) * | 2010-01-21 | 2012-05-09 | 上海交通大学 | Hypergravity fluidization vapor deposition reaction device |
| CN115090223A (en) * | 2017-02-20 | 2022-09-23 | 努斯有限责任公司 | Fluidized bed system |
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