CN109282279B - A kind of regenerated burning chemistry chains air reactor of reinforcing oxygen carrier oxidating - Google Patents
A kind of regenerated burning chemistry chains air reactor of reinforcing oxygen carrier oxidating Download PDFInfo
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- CN109282279B CN109282279B CN201811032778.5A CN201811032778A CN109282279B CN 109282279 B CN109282279 B CN 109282279B CN 201811032778 A CN201811032778 A CN 201811032778A CN 109282279 B CN109282279 B CN 109282279B
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- inner member
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/02—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)
Abstract
The invention belongs to fluidized bed and multiphase flow field, in particular to a kind of regenerated burning chemistry chains air reactor of reinforcing oxygen carrier oxidating；Including reaction chamber, the first riser, combined type inner member and the second riser；Material inlet is arranged in the side wall of the reaction chamber, and air intake is arranged in bottom；It is connected between the reaction chamber and the first riser using the first reducing pipe；Combined type inner member is installed between first riser and the second riser；The combined type inner member includes the second reducing pipe, annular inner member, guide pipe, support plate and tilting annular inner member；It solves the problems, such as that oxygen carrier radial distribution is uneven in riser in the prior art, oxidation regeneration is inefficient, can effectively extend the residence time of oxygen carrier, improve the oxidation regeneration efficiency of big partial size oxygen carrier, to improve burning chemistry chains efficiency.
Description
Technical field
The invention belongs to fluidized bed and multiphase flow field, in particular to a kind of regenerated chemical chain combustion of reinforcing oxygen carrier oxidating
Burn air reactor.
Background technique
CO2It is that maximum one kind is influenced in greenhouse gases, emission reduction CO2It is significant for alleviating greenhouse effects.Chemical chain combustion
Burning is the internationally recognized CO with important prospect2One of emission-reduction technology.Chemical chain technology is anti-using fuel reactor and air
Device is answered to substitute traditional reactor, the basic principle is that being followed between fuel reactor and air reactor using oxygen carrier
Ring completes the transmitting of oxygen, to realize the conversion of fuel.Since fuel and air are not in direct contact, fuel is complete
When reaction, fuel reactor outlets products only include CO2And H2O, without N2, need to only can be obtained by after simply condensing
The CO of high-purity2, to realize that low-power consumption separates CO2, therefore to emission reduction CO2It is significant.
Chemical chain reaction device is fuel/air mixture and the place that oxygen carrier chemically reacts, and chemical chain combustion apparatus is set
Meter has highly important influence to the efficiency of combustion of chemical chain.The design relation of reactor to fuel can Efficient Conversion, carry
Can oxysome sufficiently occur redox reaction.Wherein, air reactor not only needs to complete the oxidation regeneration of oxygen carrier, simultaneously
Need to convey enough oxygen carriers to fuel reactor also to realize the energy balance and material balance of whole device.Another party
Face, for the oxygen carrier manually prepared at present although activity is higher, preparation process is complicated, higher cost and is likely to cause secondary
Pollution, and natural iron ore oxygen carrier because it is cheap, be easy to get, it is environmental-friendly obtained more concerns, but natural iron ore
The reactivity of stone is lower, oxidation regeneration efficiency is lower, the strong influence efficiency of combustion of chemical chain.Therefore, for using
The burning chemistry chains process of natural iron ore or the lower oxygen carrier of bioactivity, design and optimization tool to air reactor
There is very great meaning.
In the prior art, most chemical chain combustion apparatus using single size round or rectangular riser.
However, Gas-particle Flows have very big inhomogeneities in above-mentioned riser, it is mainly reflected in S points of " upper dilute under dense " in the axial direction
Cloth or exponential distribution, particle show as that wall surface is dense radially, intermediate dilute " ring core " heterogeneous texture.It is deposited near wall
In a large amount of aggregate, the presence of aggregate causes local gas-solid contact to be deteriorated, so that the oxidation regeneration efficiency of oxygen carrier reduces.
In order to solve in chemical chain combustion apparatus air reactor gas-solid contact low efficiency, oxygen carrier oxygen caused by existing aggregate
Change the problems such as regeneration efficiency is low, there are many methods at present.
(Su Mingze, Zhao Haibo in horse Jin morning, wait burning chemistry chains serially to flow to a kind of presently disclosed variable diameter air reactor
Change hot CFD simulation [J] the combustion science and technology of bed system, 2015 (4): 363-369.), oxygen carrier is mainly close in lower part
Phase region completes oxidation regeneration, however the particle agglomeration phenomenon of top riser is obvious, affects the oxidation regeneration of oxygen carrier
Efficiency, while reducing the stability of system operation.
Chinese patent CN102705822A discloses a kind of cross-flow moving bed air reactor, and oxygen loss oxygen carrier is moved in cross-flow
In dynamic bed and air cross-flow reaction is to improve the reaction rate of oxygen carrier, but cross-flow moving bed general volume is larger, manufacture compared with
For inconvenience, and due to oxygen carrier and air-flow reverse flow, the oxygen carrier residence time is shorter, is unfavorable for the oxidation regeneration of oxygen carrier.
Chinese patent CN107270282A discloses a kind of Multistage tower-type adverse current bed air reactor, using multistage air distribution knot
Structure improves oxygen carrier regeneration efficiency, but its structure is complicated, can bring inconvenience in installation, manufacture and maintenance, while multistage is matched
Wind structure improves the difficulty of control, reduces reliability of operation.
Summary of the invention
The present invention solves the above-mentioned technical problems in the prior art, provides a kind of reinforcing oxygen carrier oxidating regeneratedization
Learn chain combustion air reactor.
To solve the above problems, technical scheme is as follows:
A kind of regenerated burning chemistry chains air reactor of reinforcing oxygen carrier oxidating, including it is reaction chamber, the first riser, multiple
Box-like inner member and the second riser；
Material inlet is arranged in the side wall of the reaction chamber, and air intake is arranged in bottom；
It is connected between the reaction chamber and the first riser using the first reducing pipe；
Combined type inner member is installed between first riser and the second riser；The combined type inner member includes
Second reducing pipe, annular inner member, guide pipe, support plate and tilting annular inner member；In second reducing pipe top and annular
Member lower connection, the second reducing pipe lower part are connected with the first riser top, and the guide pipe is inserted vertically into annular inner member
Inside is connected to the inner wall of annular inner member by support plate；On tilting annular inner member lower part and annular inner member
Portion's connection；Top is connect with the second riser lower part.
Preferably, reaction chamber top is connected with the first reducing pipe lower part, the first reducing pipe top and the first riser lower part
Connection.
Preferably, the material inlet tilts upward setting.It is highly preferred that the inclination angle of material inlet 2 is 45~60 degree.Oxygen carrier
Body particle enters from tilting material inlet, therefore the oxygen carrier granule into air reactor flows downward, and is unlikely to be fluidized
Wind directly blows out reaction chamber；The oxygen carrier granule to fall simultaneously and fluidized wind flow direction are on the contrary, oxygen carrier granule and fluidized wind
Between contact it is more abundant.
Preferably, the internal diameter of reaction chamber is greater than the internal diameter of the first riser.Reaction chamber internal diameter is thicker, and superficial gas velocity is lower,
Thus Gas-particle Flows are in turbulence fluidization；Turbulence fluidization bubble short circuit phenomenon is few, and gas-particle heat transfer mass-transfer efficiency is high, is conducive to carry
Oxysome regeneration.
Preferably, first reducing pipe lower part perforated area is more smaller than reaction chamber area, top perforated area and first
Riser flow area is consistent.On the one hand, the flow area of the first reducing pipe is reduced, gas-solid mixture with the increase of height
Flowing velocity is improved, and oxygen carrier granule gets enter into the first riser；On the other hand, due to the first reducing pipe lower openings
Area is slightly less than reaction chamber area, and when a large amount of oxygen carrier granules enter reducing pipe, partial particulate is back to anti-by wall surface blocking
Room is answered, wind oxidation regeneration is further fluidized.
Preferably, second reducing pipe lower part perforated area is more smaller than the first riser.Gas-solid mixture at side wall
By top wall surface blocking and flow downward, the particulate matter of whereabouts enters reducing pipe by central gas stream entrainment；Pass through such side
The aggregate of method, side wall is destroyed, and gas-solid mixture is redistributed.Second reducing pipe lower openings area ratio first mentions
Riser is smaller, since the throttle effect bring pressure loss is lower.Gas-solid mixture enters after the second reducing pipe, due to through-flow
Area reduces, and gas-solid mixture speed is improved；The focusing particles at side wall are in center simultaneously, due to center gas
Concentration is high, and gas-solid contact is strengthened.It is highly preferred that the lower part opening diameter and the first riser diameter of second reducing pipe
The ratio between be 0.8~0.9, the ratio between the second reducing pipe top opening diameter and lower part opening diameter be about 0.5~0.7, second is tapered
The ratio between length of tube and lower part opening diameter are 1.5~2.
Preferably, the ratio between annular inner member length and annular inner member opening diameter are 1~1.5.
Preferably, it is oriented to pipe diameter and annular inner member diameter ratio is 0.7~0.75, structure in guiding length of tube and annular
Part length ratio is about 1~1.5.
Preferably, the inclination angle of tilting annular inner member and vertical plane is about 15~30 degree.
Preferably, tilting annular inner member lower openings area is consistent with annular inner member perforated area, upper opening
The flow area of area and the second riser is consistent；The flow area of second riser and the flow area of the first riser
Unanimously.
Compared with the existing technology, advantages of the present invention is as follows,
(1) air reactor lower part reaction chamber internal diameter is larger, and superficial gas velocity is relatively low, and Gas-particle Flows are turbulence fluidised form
Change, bubble short circuit phenomenon is few, is conducive to oxygen carrier regeneration.
(2) lower part reaction chamber and the first riser are connected using necking, and gas-solid mixture obtains a degree of acceleration；Contracting
Mouth upper inner diameter is more slightly larger than riser, and partial particulate, which is fallen after rise by blocking to reaction chamber, further obtains oxidation regeneration.
Combined type inner member is installed between (3) first risers and the second riser, is conducive to the aggregate for destroying side wall,
Gas-solid mixture is redistributed, the oxidation regeneration efficiency of oxygen carrier is improved.
(4) combined type inner member lower part is reducing pipe, and its underpart aperture radius ratio promotion bore is smaller, is on the one hand forced
Side wall particle enters center, on the other hand can reduce because installing the inner member bring pressure loss.
(5) guide pipe, guide pipe and annular inner member are installed inside combined type inner member to connect using support plate, guide pipe
High-speed flow can be generated, stronger reflux is formed conducive to the low speed flow with side wall, extends the oxygen carrier residence time.
(6) combined type inner member top is tilting annular inner member, smaller to the obstruction of particle movement, is advantageously formed
Internal particle circulation.
Detailed description of the invention
Fig. 1 is air reactor general structure schematic diagram proposed by the present invention.
Fig. 2 is inner member structural schematic diagram used in the present invention.
Fig. 3 is guide tube structure diagram.
Fig. 4 is that inner member lower part reducing pipe acts on schematic diagram.
Fig. 5 is that inner member top guide pipe acts on schematic diagram.
Fig. 6 is the rapids on Combined air reactor (a) and the same section of single bore air reactor (b) of the invention
Kinetic energy comparison diagram.
Fig. 7 is the radially-arranged comparison diagram of particle concentration.
In figure, reaction chamber 1, material inlet 2, the first reducing pipe 3, the first riser 4.1, the second riser 4.2, in combined type
Component 5, the second reducing pipe 5.1, annular inner member 5.2, guide pipe 5.3, support plate 5.4, tilting annular inner member 5.5.
Specific embodiment
Embodiment 1:
As shown in Figs. 1-5, a kind of regenerated burning chemistry chains air reactor of reinforcing oxygen carrier oxidating, including reaction chamber 1,
First riser 4.1, combined type inner member 5 and the second riser 4.2；
Material inlet 2 is arranged in the side wall of the reaction chamber 1, and air intake is arranged in bottom；
It is connected between the reaction chamber 1 and the first riser 4.1 using the first reducing pipe 3；
Combined type inner member 5 is installed between first riser 4.1 and the second riser 4.2；In the combined type
Component 5 includes the second reducing pipe 5.1, annular inner member 5.2, guide pipe 5.3, support plate 5.4 and tilting annular inner member
5.5；Second reducing pipe, 5.1 top is connected with 5.2 lower part of annular inner member, 5.1 lower part of the second reducing pipe and the first riser 4.1
Top connection, the guide pipe 5.3 are inserted vertically into inside annular inner member 5.2, are connected to annular inner member by support plate 5.4
5.2 inner wall；5.5 lower part of tilting annular inner member is connect with 5.2 top of annular inner member；Top and the second riser
The connection of 4.2 lower parts.
Preferably, 1 top of reaction chamber is connected with 3 lower part of the first reducing pipe, 3 top of the first reducing pipe and the first riser
The connection of 4.1 lower parts.
Preferably, the material inlet 2 tilts upward setting.It is highly preferred that the inclination angle of material inlet 2 is 45~60 degree.It carries
Oxysome particle enters from tilting material inlet 2, therefore the oxygen carrier granule into air reactor flows downward, and is unlikely to be flowed
Change wind and directly blows out reaction chamber 1；The oxygen carrier granule to fall simultaneously and fluidized wind flow direction are on the contrary, oxygen carrier granule and fluidisation
Contact between wind is more abundant.
Preferably, the internal diameter of reaction chamber 1 is greater than the internal diameter of the first riser 4.1.1 internal diameter of reaction chamber is thicker, superficial gas velocity
It is lower, thus Gas-particle Flows are in turbulence fluidization；Turbulence fluidization bubble short circuit phenomenon is few, and gas-particle heat transfer mass-transfer efficiency is high,
Conducive to oxygen carrier regeneration.
Preferably, the 3 lower part perforated area of the first reducing pipe is more smaller than 1 area of reaction chamber, top perforated area and
One riser, 4.1 flow area is consistent.On the one hand, the flow area of the first reducing pipe 3 is reduced, gas-solid with the increase of height
Mixture flowing velocity is improved, and oxygen carrier granule gets enter into the first riser 4.1；On the other hand, since first is tapered
3 lower openings area of pipe is slightly less than 1 area of reaction chamber, and when a large amount of oxygen carrier granules enter reducing pipe, partial particulate is by wall surface
Blocking is back to reaction chamber 1, is further fluidized wind oxidation regeneration.
Preferably, the 5.1 lower part perforated area of the second reducing pipe is more smaller than the first riser 4.1.Gas-solid at side wall
Mixture by top wall surface blocking and flow downward, the particulate matter of whereabouts enters reducing pipe by central gas stream entrainment；Pass through
The aggregate of such method, side wall is destroyed, and gas-solid mixture is redistributed.Second reducing pipe, 5.1 lower openings face
Product is more smaller than the first riser 4.1, since the throttle effect bring pressure loss is lower.Gas-solid mixture enters the second reducing pipe
After 5.1, since flow area reduces, gas-solid mixture speed is improved；The focusing particles at side wall are at center simultaneously
Area, due to center gas concentration height, gas-solid contact is strengthened.It is highly preferred that the lower part aperture of second reducing pipe 5.1
Diameter and 4.1 diameter ratio of the first riser are 0.8~0.9,5.1 top opening diameter of the second reducing pipe and lower part opening diameter
The ratio between about 0.5~0.7, the ratio between 5.1 length of the second reducing pipe and lower part opening diameter be 1.5~2.It can further obtain preferably
Crushing agglomerates, redistribute gas-solid mixture effect.
Preferably, the ratio between 5.2 opening diameter of 5.2 length of annular inner member and annular inner member is 1~1.5.It can be further
The effect for obtaining preferable crushing agglomerates, redistributing gas-solid mixture.
Preferably, 5.3 diameter of guide pipe and 5.2 diameter ratio of annular inner member are 0.7~0.75,5.3 length of guide pipe
It is about 1~1.5 with 5.2 length ratio of annular inner member.Preferable crushing agglomerates, redistribution gas-solid mixing can further be obtained
The effect of object.
Preferably, the inclination angle of tilting annular inner member 5.5 and vertical plane is about 15~30 degree.
Preferably, 5.5 lower openings area of tilting annular inner member is consistent with 5.2 perforated area of annular inner member, on
The flow area of portion's opening area and the second riser 4.2 is consistent；The flow area of second riser 4.2 and first is promoted
The flow area of pipe 4.1 is consistent.
Preferably, the reaction chamber 1 is circular tube shaped.
Fig. 5 is the effect schematic diagram of annular inner member 5.2 and guide pipe 5.3, and gas-solid mixture enters annular inner member 5.2
Later, gas-solid mixture a part enters guide pipe 5.3, and a part is flowed from the gap around guide pipe 5.3 and support plate 5.4
Out, the air velocity that guide pipe 5.3 exports is higher, and the gas flowed out from gap around is due to flow area increase, air-flow
Speed is lower.High-speed flow and low speed flow intersection produce a degree of disturbance.Some strength is generated at side wall
Reflux, so that part oxygen carrier flows downward, simultaneously because the obstruction that tilting inner member moves particle is smaller, oxygen carrier
The interior circulation of grain is formed, and the oxygen carrier residence time is extended.On the other hand the disturbance strengthens gas at side wall and center
The interaction of stream further destroys the aggregate at side wall, and gas-solid contact is enhanced, the oxidation regeneration efficiency of oxygen carrier
It is improved.
For cooperation explanation, the present invention has carried out Numerical-Mode to Combined air reactor and single bore air reactor
Quasi-, Fig. 6 is the tubulence energy comparison diagram on Combined air reactor and the same section of single bore air reactor, from Fig. 6 (a)
In find out, after inner member, the tubulence energy of gas is greatly improved, and tubulence energy maximum appears in inner member side wall
Place, it means that central gas stream and the air-flow of side wall produce stronger disturbance, can effectively destroy the aggregate of side wall.Fig. 7
For the radially-arranged comparison diagram of particle concentration, as seen from Figure 7, when not installing inner member, particulate matter is concentrated mainly on side wall
Place, for particle agglomeration phenomenon than more serious, gas-solid contact is poor.And be mounted with after inner member, side wall particle concentration substantially drops
It is low, illustrate that aggregate is effectively destroyed at side wall, a large amount of particulate matters are less easily entrained by central area, gas-solid contact contact effect
Rate effectively improves, and is conducive to the oxidation regeneration of oxygen carrier.
It should be noted that above-described embodiment is only presently preferred embodiments of the present invention, there is no for the purpose of limiting the invention
Protection scope, the equivalent substitution or substitution made on the basis of the above all belong to the scope of protection of the present invention.
Claims (9)
1. a kind of regenerated burning chemistry chains air reactor of reinforcing oxygen carrier oxidating, which is characterized in that including reaction chamber, first
Riser, combined type inner member and the second riser；
Material inlet is arranged in the side wall of the reaction chamber, and air intake is arranged in bottom；
It is connected between the reaction chamber and the first riser using the first reducing pipe；
Combined type inner member is installed between first riser and the second riser；The combined type inner member includes second
Reducing pipe, annular inner member, guide pipe, support plate and tilting annular inner member；Second reducing pipe top and annular inner member
Lower part connection, the second reducing pipe lower part are connected with the first riser top, and the guide pipe is inserted vertically into inside annular inner member,
The inner wall of annular inner member is connected to by support plate；Tilting annular inner member lower part and annular inner member top connect
It connects；Top is connect with the second riser lower part；
First reducing pipe lower part perforated area is more smaller than reaction chamber area, top perforated area and the through-flow face of the first riser
Product is consistent.
2. strengthening the regenerated burning chemistry chains air reactor of oxygen carrier oxidating as described in claim 1, which is characterized in that institute
It states reaction chamber top to connect with the first reducing pipe lower part, the first reducing pipe top is connected with the first riser lower part.
3. strengthening the regenerated burning chemistry chains air reactor of oxygen carrier oxidating as described in claim 1, which is characterized in that institute
It states material inlet and tilts upward setting.
4. strengthening the regenerated burning chemistry chains air reactor of oxygen carrier oxidating as described in claim 1, which is characterized in that anti-
The internal diameter of room is answered to be greater than the internal diameter of the first riser.
5. strengthening the regenerated burning chemistry chains air reactor of oxygen carrier oxidating as described in claim 1, which is characterized in that institute
It is more smaller than the first riser to state the second reducing pipe lower part perforated area.
6. strengthening the regenerated burning chemistry chains air reactor of oxygen carrier oxidating as described in claim 1, which is characterized in that institute
Stating the ratio between lower part opening diameter and first riser diameter of the second reducing pipe is 0.8~0.9, and the second reducing pipe top aperture is straight
The ratio between diameter and lower part opening diameter are 0.5~0.7, and the ratio between the second tapered length of tube and lower part opening diameter are 1.5~2.
7. strengthening the regenerated burning chemistry chains air reactor of oxygen carrier oxidating as described in claim 1, which is characterized in that institute
Stating the ratio between annular inner member length and annular inner member opening diameter is 1~1.5.
8. strengthening the regenerated burning chemistry chains air reactor of oxygen carrier oxidating as described in claim 1, which is characterized in that institute
It states guiding pipe diameter and annular inner member diameter ratio is 0.7~0.75, be oriented to length of tube and annular inner member length ratio is 1
~1.5.
9. strengthening the regenerated burning chemistry chains air reactor of oxygen carrier oxidating as described in claim 1, which is characterized in that institute
It is consistent with annular inner member perforated area to state tilting annular inner member lower openings area, upper opening area and second is promoted
The flow area of pipe is consistent；The flow area of second riser is consistent with the flow area of the first riser.
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| CN104197323B (en) * | 2014-09-19 | 2017-02-15 | 东南大学 | Inner and outer circulation coupled device for separating carbon dioxide by burning coal-based chemical loopings |
| CN104848207B (en) * | 2015-04-07 | 2017-09-01 | 东南大学 | The chemical chain combustion apparatus and its method of a kind of solid fuel classification oxidation |
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