CN108640538A - Quick lime recirculating fluidized bed is classified dry digestive system - Google Patents
Quick lime recirculating fluidized bed is classified dry digestive system Download PDFInfo
- Publication number
- CN108640538A CN108640538A CN201810722747.6A CN201810722747A CN108640538A CN 108640538 A CN108640538 A CN 108640538A CN 201810722747 A CN201810722747 A CN 201810722747A CN 108640538 A CN108640538 A CN 108640538A
- Authority
- CN
- China
- Prior art keywords
- quick lime
- tower
- venturi
- digestion
- digestion tower
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 title claims abstract description 115
- 239000000292 calcium oxide Substances 0.000 title claims abstract description 56
- 235000012255 calcium oxide Nutrition 0.000 title claims abstract description 56
- 210000002249 digestive system Anatomy 0.000 title claims abstract description 17
- 230000003134 recirculating effect Effects 0.000 title claims abstract description 15
- 230000029087 digestion Effects 0.000 claims abstract description 40
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 37
- 239000003546 flue gas Substances 0.000 claims abstract description 37
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 29
- 239000000920 calcium hydroxide Substances 0.000 claims abstract description 29
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims abstract description 29
- 230000003009 desulfurizing effect Effects 0.000 claims abstract description 15
- 239000007789 gas Substances 0.000 claims abstract description 11
- 238000004891 communication Methods 0.000 claims abstract description 4
- 230000008676 import Effects 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 239000000843 powder Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 3
- 239000003595 mist Substances 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims 1
- 235000019621 digestibility Nutrition 0.000 abstract description 8
- -1 digesting tower Chemical compound 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 description 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 3
- 235000011941 Tilia x europaea Nutrition 0.000 description 3
- 238000006477 desulfuration reaction Methods 0.000 description 3
- 230000023556 desulfurization Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000004571 lime Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000000428 dust Substances 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000005243 fluidization Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2/00—Lime, magnesia or dolomite
- C04B2/02—Lime
- C04B2/04—Slaking
- C04B2/08—Devices therefor
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a kind of quick lime recirculating fluidized beds to be classified dry digestive system, it is related to the dry digestive system technical field of quick lime, including digesting tower, it includes venturi to digest tower, digestion tower is located at venturi top and is communicated with feeding system, it is communicated with desulfurizing tower positioned at venturi lower part, and forms fluidised bed zones above venturi, digestion tower, which is located above fluidised bed zones, is equipped with waterworks；Digestion tower, which is located above waterworks, is communicated with separator, separator includes primary cyclone and secondary cyclone, the import of primary cyclone is connected to digestion tower, lower exit port is connected to fluidised bed zones, top exports the inlet communication with secondary cyclone, and secondary cyclone includes calcium hydroxide outlet and exhanst gas outlet.The present invention can not only improve the digestibility of quick lime, be reduced to the quality requirements of entrance quick lime, and can reuse flue gas, energy saving and slow down influence to environment.
Description
Technical field
The present invention relates to dry digestive system technical fields, and dry digestion is classified more particularly to a kind of quick lime recirculating fluidized bed
System.
Background technology
As China controls and cuts down SO2Discharge dynamics continues to increase, and flue gas desulfurization has been enter into Rapid development stage, and
Calcium hydroxide is produced in existing dry desulfurization and semi-dry desulphurization mostly use churned mechanically mode produce, traditional mechanical agitation
It is that water is added to make calcium lime powder with water mixture slaking to produce calcium hydroxide in blender to carry out quicklime slaking, and this method, which is produced, to disappear
Quicklime slaking is insufficient during lime, and calcium hydroxide obtained cannot reach uniform puffy dry powder requirement.
Invention content
Quicklime slaking is not during preparing calcium hydroxide the technical problem to be solved by the present invention is to current dry digester
Fully, higher to the quality requirements of entrance quick lime, and calcium hydroxide cannot reach uniform puffy dry powder requirement.
In order to solve the above technical problems, the present invention provides a kind of quick lime recirculating fluidized bed classification dry digestive system, packet
Digestion tower is included, the digestion tower includes venturi, and the digestion tower is located at venturi top and is communicated with feeding system, is located at literary mound
In lower part be communicated with cleaning high-temperature flue gas（≥100℃）, and fluidised bed zones are formed above the venturi, the digestion tower position
Waterworks are equipped with above fluidised bed zones；
The digestion tower, which is located above waterworks, is communicated with separator, the separator include primary cyclone and
The import of secondary cyclone, the primary cyclone is connected to digestion tower, and lower exit port is connected to fluidised bed zones, on
Side outlet and the inlet communication of secondary cyclone, the secondary cyclone include calcium hydroxide outlet and exhanst gas outlet,
The calcium hydroxide outlet calcium hydroxide powder cabin, the exhanst gas outlet are connected to desulfurizing tower.
Technique effect：The digestion tower that the present invention is arranged provides space to prepare calcium hydroxide, and the tower gas approach of setting provides
The flue gas of flue gas after high temperature desulfurizing dedusting, high temperature desulfurizing is distributed via venturi, and fluidised bed zones are formed above venturi, raw
Lime is transported by feeding system to fluidised bed zones, is dispelled by high-temperature flue gas, and quick lime powder is made to be maintained under fluidized state, water supply
Device is located above fluidised bed zones, for providing moisture, the quick lime that moisture is entered fluidised bed zones and dispelled due to gravity
Contact, reaction generate calcium hydroxide, and in this process, quick lime is fluidized by high-temperature flue gas, more dispersed, what waterworks provided
Moisture can largely be contacted with quick lime, so as to so that the comparison of quicklime slaking is abundant, digestibility 91-93%,
The efficiency for preparing calcium hydroxide is improved simultaneously, and due to the effect of high-temperature flue gas, calcium hydroxide obtained will present dry puffy,
Production requirement can be reached, in addition, the quick lime part of the present invention generates calcium hydroxide with water in reaction zone, another part is not anti-
The quick lime answered enters in the primary cyclone of setting together with flue gas, can remove heavier bulky grain and go out from below
It is back to after mouth discharge in digestion tower and re-starts digestion, so moved in circles, can further put forward the digestibility of quick lime
Up to 94-95%, the flue gas of one cyclonic house outlet, which enters further to detach in two level cyclone dust removal gas, removes thinner niter
Grey mixture is stored to niter ash cellar, and then high-temperature flue gas, which is re-introduced into desulfurizing tower, is circulated in digestion tower,
The present invention can not only improve the digestibility of quick lime, reduce the quality requirements of digestive system entrance quick lime, and can repeat
It is energy saving and slow down influence to environment using flue gas.
The technical solution that the present invention further limits is：The waterworks include the atomization spray being arranged in digestion tower
Head, the atomizer are connected with technique water system.
Further, the position of corresponding material feeding system is equipped with feed inlet on the digestion tower, and the feed inlet refuses text
The vertical range of upper end is 1000mm in mound.
The preceding quick lime recirculating fluidized bed is classified dry digestive system, and the desulfurizing tower enters flue-gas temperature in digestion tower
It is 100~105 degree.
The preceding quick lime recirculating fluidized bed is classified dry digestive system, and the flue gas flow rate at the venturi outlet is 60
~70m/s.
The preceding quick lime recirculating fluidized bed is classified dry digestive system, and the feed grain size of the feeding system is≤3mm.
The beneficial effects of the invention are as follows：
（1）Vertical range of the feed inlet being arranged in the present invention away from venturi upper end is 1000mm, and such quick lime enters stream
In the areas Hua Chuan, quick lime can be made to be maximized by high-temperature flue gas fluidisation degree, to make it greatly be reacted with water, improved
The digestibility of quick lime；
（2）The flue gas flow rate at venturi outlet being arranged in the present invention is 60~70m/s, and the feed grain size of feeding system is
3mm can be fully fluidised when the quick lime of this range grain size enters the fluidised bed zones that flue gas flow rate is 60~70m/s,
Then haptoreaction adequately is carried out with water, improves quicklime slaking rate；
（3）The waterworks being arranged in the present invention use bidirectional flow atomizing lance, atomizing particle size≤100 micron to be atomized in this way
Water can come into full contact with the quick lime being fluidized in fluidised bed zones, to further increase quicklime slaking rate.
Description of the drawings
Fig. 1 is structural schematic diagram of the present invention for embodying digestion tower.
Wherein：1, tower is digested；11, venturi；12, fluidised bed zones；2, atomizer；3, primary cyclone；31, on
Side outlet；32, lower exit port；4, secondary cyclone；41, calcium hydroxide exports；42, exhanst gas outlet；5, feed inlet.
Specific implementation mode
Embodiment：A kind of quick lime recirculating fluidized bed is classified dry digestive system, structure as shown in Figure 1, including digestion tower 1,
It includes venturi 11 to digest tower 1, and digestion tower 1 is located at 11 top of venturi and is communicated with feed system for providing quick lime raw material
System is communicated with the desulfurizing tower for providing high-temperature flue gas positioned at 11 lower part of venturi, and forms fluid bed above venturi 11
Area 12, i.e. quick lime enter fluidised bed zones 12, are fluidized by high-temperature flue gas, and digestion tower 1, which is located to be equipped with above fluidised bed zones 12, to be given
Water installations provide moisture for the quick lime to fluidised bed zones 12, its reaction are made to generate calcium hydroxide.
Digestion tower 1, which is located above waterworks, is communicated with separator, and separator includes primary cyclone 3 and two
The import of grade cyclone separator 4, primary cyclone 3 is connected to digestion tower 1, and lower exit port 32 is connected to fluidised bed zones 12,
The inlet communication of top outlet 31 and secondary cyclone 4, a quick lime part are reacting generation in fluidised bed zones 12 with water
Calcium hydroxide, the complete quick lime of another part unreacted enter in the primary cyclone 3 of setting with flue gas, can remove together
Heavier bulky grain, which exports to be back to after 32 discharges in digestion tower 1 from below, re-starts digestion, so moves in circles, two level is revolved
Wind separator 4 includes calcium hydroxide outlet 41 and exhanst gas outlet 42,41 connection calcium hydroxide powder cabin of calcium hydroxide outlet, the company of exhanst gas outlet 42
Logical desulfurizing tower, high-temperature flue gas, which is re-introduced into desulfurizing tower, to be circulated in digestion tower 1, is recycled.
Waterworks include the atomizer 2 being arranged in digestion tower 1, and atomizer 2 is connected with technique water system, and mist
Change nozzle 2 water outlet direction and fluidised bed zones 12 flue gas flow direction face, such fog can be fluidized in fluidised bed zones 12
Quick lime come into full contact with, to further increase quicklime slaking rate, the flue gas flow rate in 11 exit of venturi is 60~
The feed grain size of 70m/s, feeding system are 3mm, and the quick lime of this range grain size enters the stream that flue gas flow rate is 60~70m/s
When the areas 12 Hua Chuan, it can be fully fluidised.
The position for digesting corresponding material feeding system on tower 1 is equipped with feed inlet 5, and feed inlet 5 refuses hanging down for 11 upper end of venturi
Straight distance is 1000mm, and it is 100~105 degree that desulfurizing tower, which enters flue-gas temperature in digestion tower 1, and such quick lime enters fluid bed
In area 12, quick lime can be made to be maximized by high-temperature flue gas fluidisation degree.
Specific implementation is described as follows：
The flue gas for the high temperature desulfurizing that desulfurization and dedusting rear fan exhaust pass provides is distributed via venturi 11, above venturi 11
Fluidised bed zones 12 are formed, quick lime is transported to fluidised bed zones 12 by feeding system, dispelled by high-temperature flue gas, and quick lime powder is made to protect
It holds under fluidized state, atomizer 2 sprays fog to fluidised bed zones 12, and moisture is contacted with the quick lime being fluidized, reaction life
At calcium hydroxide, in this process, quick lime is fluidized by high-temperature flue gas, more dispersed, and the moisture that waterworks provide can be with
Quick lime largely contacts, so as to which so that the comparison of quicklime slaking is abundant, digestibility 91-93% is improved simultaneously
The efficiency of calcium hydroxide is prepared, and since the effect of high-temperature flue gas, calcium hydroxide obtained will present puffy, production can be reached and wanted
It asks, a quick lime part is reacting generation calcium hydroxide with water, and the complete quick lime of another part unreacted enters together with flue gas to be set
In the primary cyclone 3 set, it can remove after heavier bulky grain exports 32 discharges from below and be back to weight in digestion tower 1
It is newly digested, is so moved in circles, can further be improved the digestibility of quick lime to 94-95%, one cyclonic deduster
The flue gas of outlet, which enters further to detach in two level cyclone dust removal gas, removes thinner calcium hydroxide mixture, is stored to calcium hydroxide
In storehouse, then high-temperature flue gas, which is re-introduced into desulfurizing tower, is circulated in digestion tower 1, and the present invention can not only improve quick lime
Digestibility, and flue gas can be reused, it is energy saving and slow down influence to environment.
In addition to the implementation, the present invention can also have other embodiment.It is all to use equivalent substitution or equivalent transformation shape
At technical solution, fall within the scope of protection required by the present invention.
Claims (6)
1. a kind of quick lime recirculating fluidized bed is classified dry digestive system, including digestion tower（1）, the digestion tower（1）Including literary mound
In（11）, it is characterised in that：The digestion tower（1）Positioned at venturi（11）Top is communicated with feeding system, is located at venturi
（11）Lower part is communicated with desulfurizing tower, and in the venturi（11）Top forms fluidised bed zones（12）, the digestion tower（1）It is located at
Fluidised bed zones（12）Top is equipped with waterworks；
The digestion tower（1）Separator is communicated with above waterworks, the separator includes one cyclonic separation
Device（3）And secondary cyclone（4）, the primary cyclone（3）Import with digestion tower（1）Connection, lower exit port
（32）With fluidised bed zones（12）Connection, top outlet（31）With secondary cyclone（4）Inlet communication, the two level whirlwind
Separator（4）It is exported including calcium hydroxide（41）And exhanst gas outlet（42）, the calcium hydroxide outlet（41）It is connected to calcium hydroxide powder cabin, institute
State exhanst gas outlet（42）It is connected to desulfurizing tower.
2. quick lime recirculating fluidized bed according to claim 1 is classified dry digestive system, it is characterised in that：The water supply dress
It sets including setting in digestion tower（1）Interior atomizer（2）, the atomizer（2）It is connected with technique water system, and the mist
Change nozzle（2）Water outlet direction and fluidised bed zones（12）Flue gas flow direction face.
3. quick lime recirculating fluidized bed according to claim 1 is classified dry digestive system, it is characterised in that：The digestion tower
（1）The position of upper corresponding material feeding system is equipped with feed inlet（5）, the feed inlet（5）Away from venturi（11）Upper end it is vertical
Distance is≤1000mm.
4. quick lime recirculating fluidized bed according to claim 1 is classified dry digestive system, it is characterised in that：The desulfurizing tower
Into digestion tower（1）Interior flue-gas temperature is 100~105 degree.
5. quick lime recirculating fluidized bed according to claim 1 is classified dry digestive system, it is characterised in that：The venturi
（11）The flue gas flow rate in exit is 60~70m/s.
6. quick lime recirculating fluidized bed according to claim 1 is classified dry digestive system, it is characterised in that：The feed system
The feed grain size of system is≤3mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810722747.6A CN108640538A (en) | 2018-07-04 | 2018-07-04 | Quick lime recirculating fluidized bed is classified dry digestive system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810722747.6A CN108640538A (en) | 2018-07-04 | 2018-07-04 | Quick lime recirculating fluidized bed is classified dry digestive system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108640538A true CN108640538A (en) | 2018-10-12 |
Family
ID=63750367
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810722747.6A Pending CN108640538A (en) | 2018-07-04 | 2018-07-04 | Quick lime recirculating fluidized bed is classified dry digestive system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108640538A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109608061A (en) * | 2018-12-26 | 2019-04-12 | 南京鲁兴科技有限公司 | A kind of quicklime slaking method |
| CN110385032A (en) * | 2019-06-19 | 2019-10-29 | 无锡威实工业成套设备有限公司 | A method of it reducing desulfurization waste of steam and reduces desulfurization lime consumption |
| CN114733331A (en) * | 2022-04-01 | 2022-07-12 | 大唐环境产业集团股份有限公司 | Coal-fired flue gas dechlorination system and method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2581056Y (en) * | 2002-11-19 | 2003-10-22 | 北京中科通用能源环保有限责任公司 | Smoke desulfurizing device for circulation fluidized bed |
| CN1796325A (en) * | 2004-12-29 | 2006-07-05 | 清华大学 | Method for preparing two-stage slaked lime in use for flue gas desulfurization system and equipment |
-
2018
- 2018-07-04 CN CN201810722747.6A patent/CN108640538A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2581056Y (en) * | 2002-11-19 | 2003-10-22 | 北京中科通用能源环保有限责任公司 | Smoke desulfurizing device for circulation fluidized bed |
| CN1796325A (en) * | 2004-12-29 | 2006-07-05 | 清华大学 | Method for preparing two-stage slaked lime in use for flue gas desulfurization system and equipment |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109608061A (en) * | 2018-12-26 | 2019-04-12 | 南京鲁兴科技有限公司 | A kind of quicklime slaking method |
| CN110385032A (en) * | 2019-06-19 | 2019-10-29 | 无锡威实工业成套设备有限公司 | A method of it reducing desulfurization waste of steam and reduces desulfurization lime consumption |
| CN114733331A (en) * | 2022-04-01 | 2022-07-12 | 大唐环境产业集团股份有限公司 | Coal-fired flue gas dechlorination system and method |
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| PB01 | Publication | ||
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| SE01 | Entry into force of request for substantive examination | ||
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20181012 |
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