CN101986029B - Returning-separation integrated material circulation device - Google Patents
Returning-separation integrated material circulation device Download PDFInfo
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- CN101986029B CN101986029B CN2009100901308A CN200910090130A CN101986029B CN 101986029 B CN101986029 B CN 101986029B CN 2009100901308 A CN2009100901308 A CN 2009100901308A CN 200910090130 A CN200910090130 A CN 200910090130A CN 101986029 B CN101986029 B CN 101986029B
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Abstract
The invention discloses a returning-separation integrated material circulation device, which relates to the material circulation technology. The returning-separation integrated material circulation device comprises a rising section, a fall section and a returning section. Large-particle materials of which the particle size is larger than a designed particle size of the material circulation device are separated and discharged through a discharge pipe, and other particles enter the returning section and return to a hearth. The returning-separation integrated material circulation device is mainly used for separating and discharging the large-particle materials when large-particle materials exist in a circulation loop so as to ensure smooth material circulation.
Description
Technical field
The present invention relates to material circulating technology field, is a kind of returning charge-sorting integrated material circulation device.
Background technology
Material circulation device is the critical component that constitutes the recirculating fluidized bed closed circuit.In the cyclic process of solid particle, the effect of material circulation device is that recycle stock is sent back in the riser continuously and stably, and prevent gas by the higher-pressure region anti-channeling to low-pressure area.The reliability of material circulation device work directly affects the normal and stable operation of recirculating fluidized bed.
Generally speaking, the material circulation device of recirculating fluidized bed can be divided into two kinds on mechanical valve and on-mechanical valve.Because mechanical valve is jam, wearing and tearing easily at high temperature, what therefore be widely used at present is non-mechanical valve.Comparatively common on-mechanical valve has L valve, V valve, closed conveying valve (Seal Pot), U valve (Loop Seal), H valve etc.Its operation principle all is the material that utilizes in the fluidized wind fluidisation valve body, makes it in valve body, to flow.
The U valve is a material circulation device relatively more successful in the recirculating fluidized bed of commercial Application.In practical application, have the bulky grain that surpasses the design particle diameter sometimes and get into valve body, such as: be not equipped with in the CFBB of suitable fuel crushing system, go into and sneaked into bigger particle in the stove fuel; Perhaps in closed circuit, added bulky grain for some specific use.After these bulky grains get into the U valve,, be difficult to be fluidized distinguished and admirableization, thereby be easy to be deposited on the bottom of valve body, form the fluidisation dead band, influence its normal operation, when serious even can cause the U valve entirely ineffective because its particle diameter exceeds the design particle diameter.
Summary of the invention
The purpose of this invention is to provide a kind of returning charge-sorting integrated material circulation device, be mainly used in and realize oarse-grained material sorting and discharge in the material circulation device, thereby guarantee the normal operation of material circulation device.
For achieving the above object, technical solution of the present invention is following:
A kind of returning charge-sorting integrated material circulation device; Be connected in sequence by descending branch 1, ascent stage 2, returning charge section 3; Descending branch 1 communicates with ascent stages 2 sidewall part, and the ascent stage 2 communicates with returning charge section 3 side wall upper part, and descending branch 1, ascent stages 2 bottom are provided with air-distribution device; Its descending branch 1 has descending branch column region 11, up big and down small descending branch taper branch constituency 12, descending branch air-distribution device 14 and descending branch scum pipe 15 from top to bottom successively; The descending branch taper divides the equal diameters of constituency 12 top diameters and descending branch column region 11;
Ascent stage 2 has ascent stage column region 21, up big and down small ascent stage taper branch constituency 22, ascent stage air-distribution device 24 and ascent stage scum pipe 25 from top to bottom successively; The ascent stage taper divides the equal diameters of constituency 22 top diameters and ascent stage column region 21;
Descending branch column region 11 communicates with ascent stage column region 21 lower sidewall;
The cone angle beta that the cone angle in descending branch taper branch constituency 12 and ascent stage taper divide constituency 22 is all less than 60 °.
Described returning charge-sorting integrated material circulation device; Its said descending branch 1 also comprises the descending branch fluid bed separation district 13 of cylindricality; It is positioned at 12 belows, descending branch taper branch constituency, descending branch air-distribution device 14 tops, and the diameter in descending branch fluid bed separation district 13 equates with descending branch taper branch constituency 12 base diameters.
Described returning charge-sorting integrated material circulation device; Its said ascent stage 2 also comprises the ascent stage fluid bed separation district 23 of cylindricality; It is positioned at 22 belows, ascent stage taper branch constituency, ascent stage air-distribution device 24 tops, and ascent stage fluid bed separation district 23 diameter equates with ascent stage taper branch constituency 22 base diameters.
Described returning charge-sorting integrated material circulation device, its said descending branch taper divide the fluidized wind superficial velocity U of constituency 12 with descending branch column region 11 interface places
xLess than 2U
Mf, U
MfCritical fludization velocity for design particle diameter particle.
Described returning charge-sorting integrated material circulation device, its said ascent stage taper divide the fluidized wind superficial velocity U of constituency 22 with ascent stage column region 21 interface places
sScope be U
Mf＜U
s＜5U
Mf
Described returning charge-sorting integrated material circulation device, its said descending branch air-distribution device 14 or ascent stage air-distribution device 24 are the air distribution plate of band air compartment.
Described returning charge-sorting integrated material circulation device, its said descending branch air-distribution device 14 or ascent stage air-distribution device 24 are wind-distributing pipe.
The material circulation device that the present invention proposes with sorting function, simple in structure, easy and simple to handle, can effectively prevent to surpass in the bulky grain deposition material-returning device of material-returning device design particle diameter, guaranteed the long-term stability operation of material circulation device.
Description of drawings
Fig. 1 is the sketch map of the material circulation device embodiment 1 of a kind of returning charge of the present invention-sorting integrated;
Fig. 2 is the sketch map of the material circulation device embodiment 2 of a kind of returning charge of the present invention-sorting integrated.
The specific embodiment
Like Fig. 1, shown in 2, a kind of returning charge-sorting integrated material circulation device comprises descending branch 1, ascent stage 2, returning charge section 3.Descending branch 1 is made up of the descending branch fluid bed separation district 13 of the descending branch taper branch constituency 12 of descending branch column region 11, back taper, cylindricality and descending branch air-distribution device 14 and descending branch scum pipe 15 from top to bottom successively; The descending branch taper divides the equal diameters of constituency 12 top diameters and descending branch column region 11, base diameter and descending branch fluid bed separation district 13 equal diameters; Ascent stage 2 from top to bottom successively by the ascent stage taper branch constituency 22 of ascent stage column region 21, back taper, cylindricality ascent stage fluid bed separation district 23 and ascent stage air-distribution device 24 and ascent stage scum pipe 25 constitute; The ascent stage taper divides the equal diameters of constituency 22 top diameters and ascent stage column region 21, and base diameter and ascent stage fluid bed separation go 23 equal diameters; Descending branch column region 11 communicates with ascent stage column region 21 bottoms.
The cone angle beta that the cone angle in said descending branch taper branch constituency 12 and ascent stage taper divide constituency 22 is all less than 60 °.
Said descending branch air-distribution device 14 and the air distribution plate of ascent stage air-distribution device 24 for the band air compartment also can be wind-distributing pipes.
In descending branch column region 11, feed fluidized wind through above-mentioned descending branch air-distribution device 14, the descending branch taper divides the fluidized wind superficial velocity U of constituency 12 with descending branch column region 11 interface places
xScope be U
x＜2U
Mf, U
MfCritical fludization velocity for design particle diameter particle.
In ascent stage column region 21, feed fluidized wind through ascent stage air-distribution device 24, the ascent stage taper divides the fluidized wind superficial velocity U of constituency 22 with ascent stage column region 21 interface places
sScope be U
Mf＜U
s＜5U
Mf, U
MfCritical fludization velocity for design particle diameter particle.
The descending branch taper branch constituency 12 and 22 tops, ascent stage taper branch constituency of the material circulation device of said returning charge-sorting integrated directly are communicated with.
The principle of the material circulation device of a kind of returning charge of the present invention-sorting integrated is:
Along with the increase of fluidising air velocity, fixed bed will be gradually to bubbling bed, turbulent bed and the development of fast bed state, corresponding to critical fludization velocity, initial rate of transformation and terminal velocity.Particle grain size is different, and its critical fludization velocity, initial rate of transformation and terminal velocity are also different.Therefore at identical fluidising air velocity, the particle of different-grain diameter is in different fluidized states, utilizes the difference of this state can realize the sorting of different-grain diameter particle.
Because the descending branch taper divides constituency 12 different with the cross-sectional area in descending branch fluid bed separation district 13, the superficial velocity of fluidized wind in above-mentioned two zones is also just different; Ascent stage fluid bed separation district 23, ascent stage taper divides constituency 22 different with the cross-sectional area of ascent stage column region 21, and the apparent fluidizing velocities in above-mentioned three zones are also different.
Returning charge of the present invention-sorting integrated material circulation device; Material in the descending branch column region 11 gets into descending branch taper branch constituency 12 with the mode of Negative Pressure Difference moving bed; Feed fluidized winds from 13 bottoms, descending branch fluid bed separation district through air-distribution device 14, with fluidising air velocity be controlled at make the design size particles in descending branch fluid bed separation district 13 for turbulent bed to the fluidized state of bubbling bed, be in the turbulent bed state in descending branch fluid bed separation district 13.Particle entering ascent stage taper through such descending branch taper branch constituency 12 and the 13 preliminary sortings of descending branch fluid bed separation district divides constituency 22; Feed fluidized winds from 23 bottoms, ascent stage fluid bed separation district through air-distribution device 24, with fluidising air velocity be controlled at make the design size particles the ascent stage fluid bed separation district 23 for turbulent bed to the fluidized state of bubbling bed, the ascent stage fluid bed separation district 23 be in the turbulent bed state.Surpass the design particle diameter bulky grain will all the other particles by turbulent bed in the transforming process of bubbling bed, along with the reduction of the apparent fluidizing velocity of fluidized wind, and be deposited on descending branch fluid bed separation district 13 and 23 bottom, ascent stage fluid bed separation district; All the other particles then get into returning charge section 3 with the mode of overflow or splash from the material outlet of ascent stage column region 21 sidewalls.The bulky grain that accumulates in descending branch fluid bed separation district 13 and 23 bottoms, ascent stage fluid bed separation district can regularly or continuously be discharged through descending branch scum pipe 15 and ascent stage scum pipe 25.Like this, exceed the bulky grain that designs particle diameter and can not be deposited on the material-returning device bottom, thereby the long-term stability that can realize whole material circulation device is moved.
Descending branch taper branch constituency 12 and ascent stage taper divide cone angle and the β in constituency 22 all less than 60 °; Otherwise 12 divide on 22 cross sections of constituency the fluidized wind VELOCITY DISTRIBUTION uneven with the ascent stage taper in descending branch taper branch constituency, channel occurs easily and can't realize sorting.
Material circulation device with sorting function of the present invention; Except but sorting is also discharged the bulky grain that exceeds the designed grain footpath; Can also be used to realize realization sorting of narrow-size distribution particle and circulation to different densities; The big density particulate species that exceeds design density is similar to and exceeds the bulky grain that surpasses the design particle diameter, along with the fluidized wind superficial velocity in short transverse reduces gradually, is deposited on descending branch fluid bed separation district 13 and 23 bottom, ascent stage fluid bed separation district; All the other particles then get into returning charge section 3 with the mode of overflow or splash from the material outlet of ascent stage column region 21 sidewalls.The bulky grain that accumulates in descending branch fluid bed separation district 13 and 23 bottoms, ascent stage fluid bed separation district can regularly or continuously be discharged through descending branch scum pipe 15 and ascent stage scum pipe 25.
Referring to accompanying drawing 1, a kind of returning charge-sorting integrated material circulation device comprises descending branch 1, ascent stage 2, returning charge section 3.Descending branch 1 is made up of the descending branch fluid bed separation district 13 of the descending branch taper branch constituency 12 of descending branch column region 11, back taper, cylindricality and descending branch air-distribution device 14 and descending branch scum pipe 15 from top to bottom successively; The descending branch taper divides the equal diameters of constituency 12 top diameters and descending branch column region 11, base diameter and descending branch fluid bed separation district 13 equal diameters; Ascent stage 2 from top to bottom successively by the ascent stage taper branch constituency 22 of ascent stage column region 21, back taper, cylindricality ascent stage fluid bed separation district 23 and ascent stage air-distribution device 24 and ascent stage scum pipe 25 constitute; The ascent stage taper divides the equal diameters of constituency 22 top diameters and ascent stage column region 21, and base diameter and ascent stage fluid bed separation go 23 equal diameters; Descending branch column region 11 communicates with ascent stage column region 21 bottoms; Do not establish horizontal segment between descending branch taper branch constituency 12 and the ascent stage taper branch constituency 22; The cone angle and the β in descending branch taper branch constituency 12 and ascent stage taper branch constituency 22 are 45 °.
Wherein, descending branch air-distribution device 14 and the air distribution plate of ascent stage air-distribution device 24 for the band air compartment, descending branch scum pipe 15 and ascent stage scum pipe 25 pass air compartment from the air distribution plate upper shed.
This returning charge-sorting integrated material circulation device design particle is the particle of particle diameter between 0～2mm, and bulk density is 753kg/m
3, apparent density 1143kg/m
3, average critical fludization velocity U
MfBe 0.12m/s.In descending branch 1 and ascent stage 2, feed fluidized wind respectively through descending branch air-distribution device 14 and ascent stage air-distribution device 24, the descending branch taper divides the apparent fluidizing velocity U of constituency 12 with descending branch column region 11 interface places
xBe U
Mf, i.e. 0.12m/s, the ascent stage taper divides the apparent fluidizing velocity U of constituency 22 with ascent stage column region 21 interface places
sBe 2U
Mf, i.e. 0.24m/s.
Referring to accompanying drawing 2, a kind of returning charge-sorting integrated material circulation device comprises descending branch 1, ascent stage 2, returning charge section 3.Descending branch 1 is made up of the descending branch fluid bed separation district 13 of the descending branch taper branch constituency 12 of descending branch column region 11, back taper, cylindricality and descending branch air-distribution device 14 and descending branch scum pipe 15 from top to bottom successively; The descending branch taper divides the equal diameters of constituency 12 top diameters and descending branch column region 11, base diameter and descending branch fluid bed separation district 13 equal diameters; Ascent stage 2 from top to bottom successively by the ascent stage taper branch constituency 22 of ascent stage column region 21, back taper, cylindricality ascent stage fluid bed separation district 23 and ascent stage air-distribution device 24 and ascent stage scum pipe 25 constitute; The ascent stage taper divides the equal diameters of constituency 22 top diameters and ascent stage column region 21, and base diameter and ascent stage fluid bed separation go 23 equal diameters; Descending branch column region 11 communicates with ascent stage column region 21 bottoms; Do not establish horizontal segment between descending branch taper branch constituency 12 and the ascent stage taper branch constituency 22; The cone angle and the β in descending branch taper branch constituency 12 and ascent stage taper branch constituency 22 are 60 °.
Wherein, descending branch air-distribution device 14 is a wind-distributing pipe with ascent stage air-distribution device 24, and bulky grain is respectively from directly falling into descending branch scum pipe 15 and ascent stage scum pipe 25 between wind-distributing pipe.
This returning charge-sorting integrated material circulation device design particle is that the packing density of particle of particle diameter between 0～0.7mm is 1496kg/m
3, apparent density 2526kg/m
3, average critical fludization velocity U
MfBe 0.09m/s.In descending branch 1 and ascent stage 2, feed fluidized wind respectively through descending branch air-distribution device 14 and ascent stage air-distribution device 24, the descending branch taper divides the apparent fluidizing velocity U of constituency 12 with descending branch column region 11 interface places
xBe 1.5U
Mf, i.e. 0.135m/s, the ascent stage taper divides the apparent fluidizing velocity U of constituency 22 with ascent stage column region 21 interface places
sBe 4U
Mf, i.e. 0.36m/s.
Claims (7)
1. returning charge-sorting integrated material circulation device; Be connected in sequence by descending branch (1), ascent stage (2), returning charge section (3); Descending branch (1) communicates with ascent stage (2) sidewall part; Ascent stage (2) communicates with returning charge section (3) side wall upper part, and descending branch (1), ascent stage (2) bottom are provided with air-distribution device; It is characterized in that,
Descending branch (1) has descending branch column region (11), up big and down small descending branch taper branch constituency (12) and descending branch air-distribution device (14) and descending branch scum pipe (15) from top to bottom successively; The descending branch taper divides the equal diameters of constituency (12) top diameter and descending branch column region (11);
Ascent stage (2) has ascent stage column region (21), up big and down small ascent stage taper branch constituency (22) and ascent stage air-distribution device (24) and ascent stage scum pipe (25) from top to bottom successively; The ascent stage taper divides the equal diameters of constituency (22) top diameter and ascent stage column region (21);
Descending branch column region (11) communicates with ascent stage column region (21) lower sidewall;
The cone angle in descending branch taper branch constituency (12) and ascent stage taper divide the cone angle beta in constituency (22) all less than 60 °.
2. by the described returning charge of claim 1-sorting integrated material circulation device; It is characterized in that; Said descending branch (1) also comprises the descending branch fluid bed separation district (13) of cylindricality; It is positioned at below, descending branch taper branch constituency (12), descending branch air-distribution device (14) top, and the diameter in descending branch fluid bed separation district (13) equates with descending branch taper branch constituency (12) base diameter.
3. by the described returning charge of claim 1-sorting integrated material circulation device; It is characterized in that; The said ascent stage (2) also comprises the ascent stage fluid bed separation district (23) of cylindricality; It is positioned at below, ascent stage taper branch constituency (22), ascent stage air-distribution device (24) top, and the diameter in ascent stage fluid bed separation district (23) equates with ascent stage taper branch constituency (22) base diameter.
4. by the described returning charge of claim 1-sorting integrated material circulation device, it is characterized in that said descending branch taper divides the fluidized wind superficial velocity U of constituency (12) with descending branch column region (11) interface place
xLess than 2U
Mf, U
MfCritical fludization velocity for design particle diameter particle.
5. by the described returning charge of claim 3-sorting integrated material circulation device, it is characterized in that said ascent stage taper divides the fluidized wind apparent wind velocity U of constituency (22) with ascent stage column region (21) interface place
sScope be U
Mf＜U
s＜5U
Mf, U
MfCritical fludization velocity for design particle diameter particle.
6. by claim 1,2 or 3 described returning charges-sorting integrated material circulation device, it is characterized in that said descending branch air-distribution device (14) or ascent stage air-distribution device (24) are the air distribution plate of band air compartment.
7. by claim 1,2 or 3 described returning charges-sorting integrated material circulation device, it is characterized in that said descending branch air-distribution device (14) or ascent stage air-distribution device (24) are wind-distributing pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100901308A CN101986029B (en) | 2009-07-29 | 2009-07-29 | Returning-separation integrated material circulation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100901308A CN101986029B (en) | 2009-07-29 | 2009-07-29 | Returning-separation integrated material circulation device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101986029A CN101986029A (en) | 2011-03-16 |
| CN101986029B true CN101986029B (en) | 2012-01-04 |
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ID=43710397
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|---|---|---|---|
| CN2009100901308A Active CN101986029B (en) | 2009-07-29 | 2009-07-29 | Returning-separation integrated material circulation device |
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|---|---|
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200972112Y (en) * | 2006-11-13 | 2007-11-07 | 济南锅炉集团有限公司 | Wind distribution device of return apparatus |
| JP2008241134A (en) * | 2007-03-27 | 2008-10-09 | Sumitomo Heavy Ind Ltd | Fluid bed-type boiler |
| CN101353582A (en) * | 2007-07-25 | 2009-01-28 | 中国科学院工程热物理研究所 | Solid heat carrier rapid pyrolysis method and apparatus |
-
2009
- 2009-07-29 CN CN2009100901308A patent/CN101986029B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200972112Y (en) * | 2006-11-13 | 2007-11-07 | 济南锅炉集团有限公司 | Wind distribution device of return apparatus |
| JP2008241134A (en) * | 2007-03-27 | 2008-10-09 | Sumitomo Heavy Ind Ltd | Fluid bed-type boiler |
| CN101353582A (en) * | 2007-07-25 | 2009-01-28 | 中国科学院工程热物理研究所 | Solid heat carrier rapid pyrolysis method and apparatus |
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| Publication number | Publication date |
|---|---|
| CN101986029A (en) | 2011-03-16 |
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