CN1796324A - Method for preparing slaked lime in mode of circulating fluid bed and equipment - Google Patents
Method for preparing slaked lime in mode of circulating fluid bed and equipment Download PDFInfo
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- CN1796324A CN1796324A CN 200410101854 CN200410101854A CN1796324A CN 1796324 A CN1796324 A CN 1796324A CN 200410101854 CN200410101854 CN 200410101854 CN 200410101854 A CN200410101854 A CN 200410101854A CN 1796324 A CN1796324 A CN 1796324A
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- lime
- reaction tower
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- slaked lime
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Abstract
This invention is a process and device for preparing hydrated lime by using a circulating fluidized bed, in the field of flue gas desulphurization. The lime reaction column in this invention is constituted with a cylinder sector and a cone cylinder sector. At the bottom of the cone sector is a Venturi sector, which is connected with a blending carbine. The blending carbine is fixed with a quicklime inlet and an air stream inlet, and its bottom is a cone. The cone cylinder sector is fixed with multi-layered alternative-arranged water injectors. The multi-tubular cyclone separator is connected with a discharging pipe on the top, and is also connected with the upper outlet of the cylinder sector. The bottom of the multi-tubular cyclone separator is a pyramidal face, the bottom of which is fixed with a dual channel. One end of the dual channel is connected with an air oblique slot whose lower end is connected with the bottom of the lime reaction column, and the other end is connected with a winch that conveys the products. The design of the device in this invention is rational with a fairly low cost, and this invention can largely lower the operation cost of the flue gas desulphurization system.
Description
Technical field
The invention belongs to the flue gas desulfurization technique field, be equipped with the method and the device thereof of slaked lime especially for the outer double round robin of the Ta Neita of dry flue gas desulphurization system.
Background technology
Sulfurous gas is one of principal pollutant that cause problem of environmental pollutions such as Greenhouse effect, acid rain.China's energy structure fire coal for a long time accounts for more than 70% always, and in foreseeable future, China is that the energy structure of main energy sources can not obtain radical change with the coal, and using in a large number of coal produces a large amount of pollutents such as sulfurous gas.At present, China's sulfurous gas annual emissions is first place, the world, position, has a strong impact on the Sustainable development of Chinese national economy.
The flue gas desulfurization of prior art can be divided into wet method and dry method (semidrying) two big classes.Wet process of FGD technology (WFGD), though the desulfuration efficiency height, complex process, resistance are bigger, one-time investment is big, working cost is high, floor space is big.And the desulfurization product of dry flue gas desulphurization is a dry powder, can well overcome some problem and shortage of wet desulphurization.Along with the research and development of Technology, the particularly development of circulating fluid bed flue-gas desulfurizing technology, the dry flue gas desulphurization technology has obtained application more and more widely.In dry method flue gas desulfur device, sweetening agent sprays into the absorption tower with dry powder, and water sprays into by water spouting nozzle, and sweetening agent is slaked lime powder normally.For the dry flue gas desulphurization technology, the size of sorbent particle particle diameter and surface-active height are the important factors that influences the height of the utilization ratio of sweetening agent in its desulphurization system and desulfurization degree.Yet present circulating fluid bed flue-gas desulfurizing technology mostly utilizes slaked lime powder that the non-fluidization mode produces as sweetening agent, is exactly the usual way of producing slaked lime at present as Chinese patent ZL01275451.X disclosed " a kind of quicklime slaking device ".These slaked lime powders not only price are higher, and particle diameter is bigger, and surfactivity is poor, and are very low in the utilization ratio of the sorbent particle of thionizer internal reaction, and desulfurization degree is not high simultaneously, increased the working cost of desulphurization system.
Summary of the invention
At above-mentioned problems of the prior art, it is stronger to the purpose of this invention is to provide a kind of adaptability of restricted condition that exists in actual applications, the method and the device thereof of the preparing slaked lime in mode of circulating fluid bed that is used for the dry flue gas desulphurization system that digestive efficiency is higher.The inventive method program is simple, easy to operate.Apparatus of the present invention are reasonable in design, equipment cost is low, use the running cost that the present invention can reduce flue gas desulphurization system greatly.
In order to realize above-mentioned goal of the invention, technical scheme of the present invention realizes as follows:
A kind of method of preparing slaked lime in mode of circulating fluid bed, it comprises uses lime reaction tower and multiclone, and its algorithm is:
1) fluidized wind and unslaked lime material are imported by the bottom of lime reaction tower respectively, mixed the back and form the fluidized mixture;
2) the Venturi section of fluidized mixture process lime reaction tower enters the awl column body segment diffusion of lime reaction tower, with multi-level water spray system generation digestion reaction formation gas, liquid, solid three-phase mixed reactant set in the lime reaction tower awl column body segment;
3) particle that a part of particle diameter is bigger in the mixed reactant is because the less lime reaction tower bottom that falls back to of flow velocity, fall back in the lime reaction tower behind particle that another part flow velocity is bigger in the mixed reactant and the lime reaction tower direct tube section top bump, this two portions particle forms lime reaction tower internal recycle, and remaining particle forms slaked lime along with gas enters multiclone;
4) the part slaked lime by chute that quality is bigger is input to and carries out recirculation in the lime reaction tower, the slaked lime of the part that quality is less is transported to the slaked lime finished bin by control valve through auger and stores, and the weary gas in the multiclone can directly be sent into the desulfurization reaction tower inlet.
In the above-mentioned method for preparing slaked lime, the warm air of described fluidized wind for blasting with gas blower, warm air are the normal temperature air of heater via heating.
In the above-mentioned method for preparing slaked lime, described multi-level water spray system is made up of two-layer, and each layer water spray system adopts two-fluid spray nozzle to be arranged in lime reaction tower center.
In the above-mentioned method for preparing slaked lime, the fluidizing velocity of fluidized wind is 0.5～8m/s in the described lime reaction tower, and the fluidizing velocity of Venturi section quicklime particles is 16～18m/s.
Realize the device of the method for above-mentioned preparing slaked lime in mode of circulating fluid bed, it comprises lime reaction tower and multiclone.Its constructional feature is that described lime reaction tower is to be formed by connecting by direct tube section and awl column body segment.The awl column body segment bottom of lime reaction tower is provided with the Venturi section, and the Venturi section is connected with blending bunker.Be equipped with unslaked lime import and fluidized wind import on the blending bunker, the bottom of blending bunker is a cone.Lime reaction tower awl column body segment is provided with the spaced apart water-jet of multilayer, and the top of multiclone connects vapor pipe, and the outlet of lime reaction tower direct tube section top is connected with described multiclone.The bottom surface of multiclone is a conical surface, and the bottom of conical surface is equipped with the two channels that is opened and closed by two-way control valve control.A twin-channel side connects air flume, and the air flume lower end is connected with lime reaction tower bottom, and twin-channel opposite side connects the auger of carrying finished product.
In said apparatus, described lime reaction tower awl column body segment is provided with two-layer spaced apart water-jet, and water-jet adopts two-fluid spray nozzle to be arranged in lime reaction tower center.
In said apparatus, the bottom of described cone is equipped with the ash port that is opened and closed by control valve control.
In said apparatus, described each control valve is a star valve.
Compare with currently used non-fluidization quicklime slaking device, the invention has the advantages that:
The first, the present invention adopts the circulating fluidization mode to carry out quicklime slaking, has avoided the equipment pipe fouling to stop up, and apparatus structure compactness, resistance little, be convenient to install.
The second, unslaked lime circulates through outer couple of Ta Neita, the utilization ratio height of unslaked lime, and water loss is low.
The 3rd, behind the unslaked lime process internal recycle flash trapping stage, carry out secondary separation through multiclone, may be controlled to product slaked lime particle size range at 20～30um.
The 4th, the finished product slaked lime is the dry powder attitude, is convenient to store.
The 5th, apparatus of the present invention can be directly and desulphurization system connect, operation continuously improves the stability of desulphurization system operation simultaneously, reduces the running cost of flue gas desulphurization system.
The present invention will be further described below in conjunction with accompanying drawing and concrete embodiment.
Description of drawings
Accompanying drawing is the structure principle chart of apparatus of the present invention.
Embodiment
Referring to accompanying drawing, apparatus of the present invention comprise lime reaction tower 5 and multiclone 6.Lime reaction tower 5 is to be formed by connecting by direct tube section and awl column body segment, and the awl column body segment bottom of lime reaction tower 5 is provided with Venturi section 3.Venturi section 3 is connected with blending bunker 12, is equipped with unslaked lime import 1 and fluidized wind import 2 on the blending bunker 12.The bottom of blending bunker 12 is a cone 14, and the bottom of cone 14 is equipped with the ash port 13 by the control valve 7 control switchings of star.Lime reaction tower 5 awl column body segments are provided with the water-jet 4 that two-layer employing two-fluid spray nozzle is arranged in lime reaction tower 5 centers.The top of multiclone 6 connects vapor pipe 11, and the outlet of lime reaction tower 5 direct tube section tops is connected with described multiclone 6, and the bottom surface of multiclone 6 is a conical surface 10.The bottom of conical surface 10 is equipped with the two channels 15 that is opened and closed by 7 controls of two-way star control valve, and a side of two channels 15 connects air flume 8, and air flume 8 lower ends are connected with lime reaction tower 5 bottoms, and the opposite side of two channels 15 connects the auger 9 of carrying finished product.
When apparatus of the present invention were used, its workflow was:
1) normal temperature air with the heater via heating blasts the formation fluidized wind with gas blower, fluidized wind mixes back formation fluidized mixture by the fluidizing velocity input of the fluidized wind import 2 on the lime reaction tower 5 bottom blending bunker 12 with 0.5～8m/s with the unslaked lime material that the unslaked lime import 1 on the blending bunker 12 is imported.
2) the fluidized mixture awl column body segment diffusion that enters lime reaction tower 5 with the fluidizing velocity of 16～18m/s through the Venturi section 3 of lime reaction tower 5, the two-layer water spray system generation digestion reaction that adopts two-fluid spray nozzle to arrange with center in the lime reaction tower 5 awl column body segments forms gas, liquid, solid three-phase mixed reactant.
3) mixed reactant fully digestion in lime reaction tower 5, because awl column body segment top section area increases, the particulate flow velocity reduces gradually in the mixture.The particle that wherein a part of particle diameter is bigger falls back in the lime reaction tower 5 owing to speed is less, fall back in the lime reaction tower behind particle that another part speed is bigger and the lime reaction tower 5 direct tube section tops bump, this two portions particle forms lime reaction tower internal recycle and discharges from ash port 13.Remaining particle forms slaked lime along with gas enters multiclone 6.
4) the part slaked lime that quality is bigger is input to by air flume 8 and carries out recirculation in the lime reaction tower 5, the less part slaked lime of quality is transported to the slaked lime finished bin by control valve 7 through auger 9 and stores, and the weary gas in the multiclone 6 can directly be sent into desulfurization reaction tower 5 inlets.
Claims (8)
1, a kind of method of preparing slaked lime in mode of circulating fluid bed, it comprises uses lime reaction tower and multiclone, and its algorithm is:
1) fluidized wind and unslaked lime material are imported by the bottom of lime reaction tower respectively, mixed the back and form the fluidized mixture;
2) the Venturi section of fluidized mixture process lime reaction tower enters the awl column body segment diffusion of lime reaction tower, with multi-level water spray system generation digestion reaction formation gas, liquid, solid three-phase mixed reactant set in the lime reaction tower awl column body segment;
3) particle that a part of particle diameter is bigger in the mixed reactant is because the less lime reaction tower bottom that falls back to of flow velocity, fall back in the lime reaction tower behind particle that another part flow velocity is bigger in the mixed reactant and the lime reaction tower direct tube section top bump, this two portions particle forms lime reaction tower internal recycle, and remaining particle forms slaked lime along with gas enters multiclone;
4) the part slaked lime by chute that quality is bigger is input to and carries out recirculation in the lime reaction tower, the slaked lime of the part that quality is less is transported to the slaked lime finished bin by control valve through auger and stores, and the weary gas in the multiclone can directly be sent into the desulfurization reaction tower inlet.
According to the method for the described preparing slaked lime in mode of circulating fluid bed of claim 1, it is characterized in that 2, the warm air of described fluidized wind for blasting with gas blower, warm air are the normal temperature air of heater via heating.
According to the method for the described preparing slaked lime in mode of circulating fluid bed of claim 1, it is characterized in that 3, described multi-level water spray system is made up of two-layer, each layer water spray system adopts two-fluid spray nozzle to be arranged in lime reaction tower center.
According to the method for claim 1,2 or 3 described preparing slaked lime in mode of circulating fluid bed, it is characterized in that 4, the fluidizing velocity of fluidized wind is 0.5～8m/s in the described lime reaction tower, the fluidizing velocity of Venturi section quicklime particles is 16～18m/s.
5, realize the device of the method for the described preparing slaked lime in mode of circulating fluid bed of claim 1, it comprises lime reaction tower (5) and multiclone (6), it is characterized in that, described lime reaction tower (5) is to be formed by connecting by direct tube section and awl column body segment, the awl column body segment bottom of lime reaction tower (5) is provided with Venturi section (3), Venturi section (3) is connected with blending bunker (12), be equipped with unslaked lime import (1) and fluidized wind import (2) on the blending bunker (12), the bottom of blending bunker (12) is cone (14), lime reaction tower (5) awl column body segment is provided with the spaced apart water-jet of multilayer (4), the top of multiclone (6) connects vapor pipe (11), the outlet of lime reaction tower (5) direct tube section top is connected with described multiclone (6), the bottom surface of multiclone (6) is conical surface (10), the bottom of conical surface (10) is equipped with the two channels (15) that is opened and closed by two-way control valve (7) control, one side of two channels (15) connects air flume (8), air flume (8) lower end is connected with lime reaction tower (5) bottom, and the opposite side of two channels (15) connects the auger (9) of carrying finished product.
6, according to the device of the method for the described preparing slaked lime in mode of circulating fluid bed of claim 5, it is characterized in that, described lime reaction tower (5) awl column body segment is provided with two-layer spaced apart water-jet (4), and water-jet (4) adopts two-fluid spray nozzle to be arranged in lime reaction tower (5) center.
According to the described device of claim 6, it is characterized in that 7, the bottom of described cone (14) is equipped with the ash port (13) that is opened and closed by control valve (7) control.
According to claim 5,6 or 7 described devices, it is characterized in that 8, described each control valve (7) is a star valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410101854 CN1796324A (en) | 2004-12-29 | 2004-12-29 | Method for preparing slaked lime in mode of circulating fluid bed and equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200410101854 CN1796324A (en) | 2004-12-29 | 2004-12-29 | Method for preparing slaked lime in mode of circulating fluid bed and equipment |
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| CN1796324A true CN1796324A (en) | 2006-07-05 |
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| CN 200410101854 Pending CN1796324A (en) | 2004-12-29 | 2004-12-29 | Method for preparing slaked lime in mode of circulating fluid bed and equipment |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102266718A (en) * | 2010-06-07 | 2011-12-07 | 中国科学院过程工程研究所 | Semi dry process flue gas desulfurization method of circulating fluidized bed based on circulation, and apparatus thereof |
| CN104451006A (en) * | 2014-12-11 | 2015-03-25 | 山东钢铁股份有限公司 | Pea coal pulverizing system and pea coal pulverizing method |
| CN105712640A (en) * | 2014-12-01 | 2016-06-29 | 鞍钢股份有限公司 | Sintering quicklime digestion device and method |
| CN106186742A (en) * | 2016-08-29 | 2016-12-07 | 辽宁信威环保科技有限公司 | Light calcined magnesia flaring suspension roasting device |
-
2004
- 2004-12-29 CN CN 200410101854 patent/CN1796324A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102266718A (en) * | 2010-06-07 | 2011-12-07 | 中国科学院过程工程研究所 | Semi dry process flue gas desulfurization method of circulating fluidized bed based on circulation, and apparatus thereof |
| CN102266718B (en) * | 2010-06-07 | 2014-07-30 | 中国科学院过程工程研究所 | Semi dry process flue gas desulfurization method of circulating fluidized bed based on circulation, and apparatus thereof |
| CN105712640A (en) * | 2014-12-01 | 2016-06-29 | 鞍钢股份有限公司 | Sintering quicklime digestion device and method |
| CN105712640B (en) * | 2014-12-01 | 2019-08-27 | 鞍钢股份有限公司 | A kind of sintering burnt lime slaking device and method |
| CN104451006A (en) * | 2014-12-11 | 2015-03-25 | 山东钢铁股份有限公司 | Pea coal pulverizing system and pea coal pulverizing method |
| CN106186742A (en) * | 2016-08-29 | 2016-12-07 | 辽宁信威环保科技有限公司 | Light calcined magnesia flaring suspension roasting device |
| CN106186742B (en) * | 2016-08-29 | 2018-04-13 | 辽宁科技大学 | Light calcined magnesia flaring suspension roasting device |
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