CN109631593A - Revolution limekiln preheater with high-efficiency flue gas desulfurization - Google Patents

Revolution limekiln preheater with high-efficiency flue gas desulfurization Download PDF

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Publication number
CN109631593A
CN109631593A CN201910109617.XA CN201910109617A CN109631593A CN 109631593 A CN109631593 A CN 109631593A CN 201910109617 A CN201910109617 A CN 201910109617A CN 109631593 A CN109631593 A CN 109631593A
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China
Prior art keywords
flue gas
revolution
sulphur
desulfurization
limekiln
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CN201910109617.XA
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CN109631593B (en
Inventor
庞焕军
张林进
***
沈浩
赵波
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SINOCALCI Corp
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SINOCALCI Corp
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Priority to CN201910109617.XA priority Critical patent/CN109631593B/en
Publication of CN109631593A publication Critical patent/CN109631593A/en
Priority to PCT/CN2019/115227 priority patent/WO2020164259A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D13/00—Apparatus for preheating charges; Arrangements for preheating charges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/48—Sulfur compounds
    • B01D53/50—Sulfur oxides
    • B01D53/508—Sulfur oxides by treating the gases with solids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/81—Solid phase processes
    • B01D53/83—Solid phase processes with moving reactants
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/004—Systems for reclaiming waste heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • B01D2258/0283—Flue gases
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

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  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Treating Waste Gases (AREA)

Abstract

The present invention relates to a kind of revolution limekiln preheater with high-efficiency flue gas desulfurization, it includes preheater main body, top feed bin, feeder pipe, smoke exhaust pipe, push rod device, feeding chute, it further include sulphur-fixing agent auxiliary agent conveyance conduit, the lower end of the sulphur-fixing agent auxiliary agent conveyance conduit is provided with nozzle, which is located at the top of feeding chute.The present invention passes through the setting of sulphur-fixing agent auxiliary agent conveyance conduit, sulphur-fixing agent auxiliary agent powder can be delivered to the nozzle in preheater main body above feeding chute by the sulphur-fixing agent auxiliary agent conveyance conduit under the action of high-speed flow, and it sprays via nozzle to be mixed with the high-temperature flue gas stream from revolution limekiln, come the pyrolytic for improving sulphur-fixing agent microstructure, delaying desulfurization product, its decomposition temperature is improved.

Description

Revolution limekiln preheater with high-efficiency flue gas desulfurization
Technical field:
The present invention relates to a kind of limekiln flue gas desulfurization device, in particular to a kind of revolution limekiln with high-efficiency flue gas desulfurization Preheater.
Background technique:
Flue gas desulfurization technique mainly has dry method, semidry method and wet desulphurization at present, and it is de- that these technical solutions generally use calcium base Sulphur agent.SO in calcium-based desulfurizing agent and flue gas2Generate CaSO3, CaSO is further oxidized under high temperature4.To make SO2Gas from It removes, be fixed in desulfurizing agent in flue gas.
For limekiln, the raw material of investment is the lime stone based on calcium carbonate, and product is based on calcium oxide Both lime has and absorbs SO2Ability, be all common calcium-based desulfurizing agent.
The revolution limekiln of mainstream is equipped with shaft preheater at present, can recycle row during limestone calcination The waste heat for the high-temperature flue gas put.Lime building stones are stored in feed bin at the top of the preheater of limekiln first, enter through feeder pipe vertical In annular-heating space in the middle part of preheater.In annular-heating space, lime building stones move from top to bottom, and high-temperature flue gas is under And heat and mass is carried out while upper flowing, lime building stones and high-temperature flue gas adverse current.In lime building stones dropping process, lime stone Grain is gradually heated by high-temperature flue gas and is decomposed, and calcium oxide is resolved into outer surface at first, when reaching near the cone bucket of preheater bottom, Limestone particle is heated to 900~1100 DEG C or so, probably there is 30% decomposition of limestone；Flue gas is in uphill process, high temperature To lime building stones, flue gas own temperature gradually declines the heat transfer of flue gas in uphill process, reaches the row on preheater top When near smoke pipe, flue-gas temperature drops to 260~300 DEG C or so.Under the lime building stones that fall near the cone bucket of preheater bottom pushed away Lever apparatus be pushed into feeding chute, into rotary kiln in calcine.
Lime building stones can collide between material and material in outer surface during preheating decline, material outermost layer Therefore the cao layers of generation can be broken into lime powder.When lime building stones are calcined in rotary kiln simultaneously, lime building stones Constantly tumbling motion, friction kiln wall, the cao layers that lime building stones outside generates can also take off because with the collision of kiln wall, friction due to It falls, be crushed, generate the small lime powder of a large amount of partial size.Under the impact of high velocity smoke, lime powder is scattered in cigarette It in gas, moves, partially enters in firing product with the flowing of flue gas；Part enters smoke exhaust pipe, is trapped by cleaner.
Although having a large amount of lime in limekiln, while a large amount of small lime powders of partial size are distributed in flue gas, kiln Ratio needed for interior Ca/S ratio much meets desulfurization, but desulfurization degree is still lower, SO in smoke evacuation2It is higher, it is not able to satisfy environmental protection Requirement, it is also necessary to add additional flue gas desulfurization device again.
Moreover, calcium oxide and SO2The reaction for generating calcium sulfite is a reversible reaction, and temperature more high reaction rate is bigger, But after temperature height is to certain temperature, calcium sulfite decomposition rate will be greater than its formation speed.At high temperature, there is O2In the presence of When, the calcium sulfite of generation will quickly be oxidized to calcium sulfate, and calcium sulfate has high-temperature stability.
In short, causing calcium oxide desulfurization degree is low to have following factor:
1) related with calcium oxide microstructure: after lime building stones react progress a period of time, calcium oxide particle surface pore is quickly It is blocked, to prevent SO2The diffusion internal to it, declines sulfur-fixing rate；
2) calcium oxide and SO2It is a gas-solid reaction, with the progress of reaction, calcium oxide activity is reduced；
3) desulfurization reaction is reversible process, and temperature has important influence to reaction process.Temperature is low, and reaction speed is slow, towards The direction for generating sulfur retention products carries out；Temperature is too high, and reaction rate is fast, but sulfur retention products decomposition can occur, and reacts towards analysis SO out2Direction carry out, especially temperature be higher than 1200 DEG C when have a large amount of SO2It is precipitated.
Summary of the invention:
In order to overcome the problems referred above, for the thermal characteristics in revolution limekiln itself, the present invention is transformed revolution limekiln, purport A kind of revolution limekiln preheater with high-efficiency flue gas desulfurization is being provided.
To achieve the above object, the present invention provides a kind of revolution limekiln preheater with high-efficiency flue gas desulfurization, packet Preheater main body, top feed bin, feeder pipe, smoke exhaust pipe, push rod device, feeding chute are included, further includes sulphur-fixing agent auxiliary agent delivery pipe The lower end in road, the sulphur-fixing agent auxiliary agent conveyance conduit is provided with nozzle, which is located at the top of feeding chute.
In the present invention, by the setting of sulphur-fixing agent auxiliary agent conveyance conduit, sulphur-fixing agent auxiliary agent powder can be in high-speed flow Under the action of the nozzle in preheater main body above feeding chute is delivered to by the sulphur-fixing agent auxiliary agent conveyance conduit, and via spray Mouth is sprayed to mix with the high-temperature flue gas stream from revolution limekiln, Lai Gaishan sulphur-fixing agent (calcium oxide i.e. in revolution limekiln) Microstructure, the pyrolytic for delaying desulfurization product (i.e. calcium sulfite), improve its decomposition temperature.
Further, sulphur-fixing agent auxiliary agent conveyance conduit is arranged in the center of preheater main body.
By above-mentioned setting, sulphur-fixing agent auxiliary agent can be made to be uniformly mixed with high-temperature flue gas stream.
Further, above-mentioned preheater main body includes the inner panel and outside plate for surrounding annular-heating space jointly, the annular-heating Space includes low-temperature zone, desulfurization section and high temperature section, which is arranged to section from top to bottom and first becomes larger become smaller again to increase object Expect the residence time in the desulfurization section.
It is arranged by above structure, when can increase stop of the material in preheater in 800~900 DEG C of temperature ranges Between.
Further, there is the first rake and the second rake in above-mentioned desulfurization section inner panel, the first rake is arranged to Its horizontal tilt angle is less than the stocking angle of material, and the second rake is arranged to its horizontal tilt angle greater than rubbing between material and inner panel Wipe angle.
By the setting of the first rake and the second rake, the movement of building stones can not be influenced and added full of entire annular Heat space.
Further, above-mentioned inner panel is additionally provided with vertical portion between the first rake and the second rake.
Also further, the temperature setting of above-mentioned desulfurization section is 800~900 DEG C.
Also further, the above-mentioned revolution limekiln preheater with high-efficiency flue gas desulfurization further includes flue gas impeller guide water spray Device, the flue gas impeller guide water injector are installed in the arrival end of smoke exhaust pipe.
Flue gas impeller guide water injector is added in smoke exhaust pipe arrival end, again active oxidation calcium, increases preheater main body The reaction speed of interior low-temperature region promotes sulfur-fixing rate；
Further, above-mentioned flue gas impeller guide water injector includes upper fixed ring, bottom plate, is installed on lower solid top plate simultaneously Towards inside flue gas impeller guide water injector nozzle, connect with nozzle water pipe, be fixed on upper fixed ring and bottom plate Between multiple deflectors, multiple deflector tangentially divides around one of flue gas impeller guide water injector internal imaginary circle Cloth.
It is arranged by above structure, the flowing side that flue gas enters in smoke exhaust pipe can be changed by means of the arrangement of deflector To so that 1) direction of flue gas inflow smoke exhaust pipe can be increased in this way from axially becoming tangential along smoke exhaust pipe along smoke exhaust pipe The heat and mass of the time of contact of calcium oxide and flue gas, 2) quickening water droplet and flue gas.
Further, above-mentioned multiple deflectors are evenly distributed along internal imaginary circle.
Also further, the radius of above-mentioned internal imaginary circle is the half of the radius of smoke exhaust pipe.
This setting enables flue gas to form strong eddy flow flowing in flue gas impeller guide water injector.
By reference to the embodiments described below, above-mentioned these and other aspects of the invention will obtain more clear It illustrates clearly.
Detailed description of the invention:
The structure of invention and further objects and advantages will be better understood by description with reference to the accompanying drawing, In, identical reference marker identifies identical element:
Fig. 1 is the interior of the revolution limekiln preheater with high-efficiency flue gas desulfurization of a specific embodiment according to the present invention Portion's structural schematic diagram；
Fig. 2 is the annular-heating space schematic diagram of the revolution limekiln preheater shown in Fig. 1 with high-efficiency flue gas desulfurization, and the figure is clear Showing to Chu the desulfurization section in annular-heating space, section first becomes larger the structure to become smaller again from top to bottom；
Fig. 3 is the flue gas impeller guide water injector of the revolution limekiln preheater shown in Fig. 1 with high-efficiency flue gas desulfurization.
Specific embodiment:
A specific embodiment of the invention is described below in conjunction with attached drawing.
As shown in Fig. 1, the revolution limekiln with high-efficiency flue gas desulfurization of a specific embodiment according to the present invention Preheater includes top feed bin 1, preheater main body 2, feeder pipe 3, smoke exhaust pipe 4, push rod device 5, feeding chute 6, further includes solid The lower end of sulphur agent aid conveyance conduit 7, the sulphur-fixing agent auxiliary agent conveyance conduit 7 is provided with nozzle 70, which is located at blanking chute The top of slot 6.Preferably, sulphur-fixing agent auxiliary agent conveyance conduit 7 is arranged in the center of preheater main body 2.
As shown in Figure 1, simultaneously referring to figs. 2 and 3, preheater main body 2 includes the inner panel for surrounding annular-heating space 20 jointly 21 and outside plate 22.The annular-heating space 20 includes low-temperature zone, desulfurization section and high temperature section, which is arranged to cut from top to bottom Face first becomes larger the (see figure 2) that becomes smaller again, to increase residence time of the material in the desulfurization section.Desulfurization section (temperature be 800~ 900 DEG C), inner panel 21 has the first rake 210, vertical portion 211, the second rake 212, and the first rake 210 is arranged to it Horizontal tilt angle α is less than the stocking angle of material, and the second rake 212 is arranged to its horizontal tilt angle beta and is greater than between material and inner panel Angle of friction, as shown in Figure 3.
As shown in Figure 1, and refer to Fig. 3, in the present embodiment, revolution limekiln preheater further include flue gas impeller guide Water injector 8, the flue gas impeller guide water injector 8 are installed in the arrival end of smoke exhaust pipe 4.As shown in figure 3, the flue gas eddy flow is led Stream water injector 8 includes upper fixed ring 81, bottom plate 83, is installed on lower solid top plate 83 and sprays water towards flue gas impeller guide Nozzle 85 inside device 8, the water pipe 87 being connect with nozzle 85, be fixed on it is multiple between upper fixed ring 81 and bottom plate 83 Deflector 82.Multiple deflector 82 is tangentially equal around an internal imaginary circle (not shown) of flue gas impeller guide water injector Even distribution.In the present embodiment, the radius of the inside imaginary circle is the half of the radius of smoke exhaust pipe 4, and certainly, this is wherein One example, also can be set into other numerical value of " half " left and right, as long as flue gas can be made to spray water in flue gas impeller guide Strong eddy flow flowing is formed in device 8, it is too small or too all unfavorable to eddy flow flowing greatly.
Generally speaking, the phenomenon low for calcium oxide desulfurization degree in the prior art, the measure that present embodiment is taken have: 1) Sulphur-fixing agent auxiliary agent is sprayed into 6 top of feeding chute by sulphur-fixing agent auxiliary agent conveyance conduit 7, some sulphur-fixing agent auxiliary agents can improve solid The microstructure of sulphur agent (i.e. calcium oxide), other sulphur-fixing agent auxiliary agents can delay the high temperature point of desulfurization product (i.e. calcium sulfite) Solution, improves its decomposition temperature；2) flue gas impeller guide water injector 8 is added in the arrival end of smoke exhaust pipe 4, again active oxidation Calcium increases the reaction speed of low-temperature zone in annular-heating space 20, promotes sulfur-fixing rate；3) change annular in preheater main body 2 to add The structure of heat space 20 increases the volume in optimum temperature area, increases residence time of the material in this temperature region.
For above-mentioned measure 1)~3), concrete operations measure is described below:
1) the sulphur-fixing agent auxiliary agent powder that will have been ground is conveyed under the action of high-speed flow by sulphur-fixing agent auxiliary agent conveyance conduit 7 To the nozzle 70 of the top of 20 high temperature section feeding chute 6 of annular-heating space, carries the air-flow of sulphur-fixing agent auxiliary agent powder and come from The high-temperature flue gas stream of rotary kiln uniformly mixes.
It should be noted that improving the auxiliary agent of sulphur-fixing agent microstructure generally has alkali metal compound and organic solution, this The addition of a little auxiliary agents can improve sulphur-fixing agent micro-pore diameter size, hole internal structure, pore specific surface area, pore size distribution etc., to mention The activity of high sulphur-fixing agent, and then improve sulfur-fixing rate.Wherein alkali metal compound auxiliary agent mainly has Na2CO3、NaCl、KCl。Na2CO3 Addition can promote CaO crystal lattice rearrangement, improve the distribution in hole and the size in hole, inhibit the pyrolytic of sulfur retention products.NaCl, The presence of KCl improves efficiency of CaO during solid sulphur, this is because will form the NaCl/ of a thin layer during the reaction CaO, KCl/CaO eutectic layer increase the migration and diffusivity of sodium, potassium ion, lead to the change of CaO lattice structure, thus Improve CaO property.
Sulphur-fixing agent auxiliary agent is added in sulphur-fixing agent, is capable of forming total with high high-temp stability containing sulfur minerals or formation low temperature Fusant wraps up and prevents CaSO4The additive of decomposition.These sulphur-fixing agent auxiliary agents mainly have:
The addition of iron, silicon components can generate Ca-Fe-Si-O system, form a kind of resistance to heat portland stable phase, calcium sulfate quilt The covering of high-melting-point silicate or package, effectively prevent decomposing again for calcium sulfate, can significantly improve the desulfurization degree under high temperature；
Fe2O3The reaction rate for accelerating calcium oxide and sulfur dioxide, it is oxidizable at calcium sulfate under calcium sulfite high temperature；
Al2O3It can also inhibit the pyrolytic of sulfur retention products, while can be formed with high thermal stabilityDouble salt, and this product can cover or wrap up CaSO4The surface of crystal inhibits its decomposition, effectively mentions High captured sulfur result；
MgO plays a driving role to the desulfurization reaction of CaO, can be catalyzed lime desulfurization reaction；
Therefore, sulphur-fixing agent auxiliary agent main component is Al2O3、SiO2、MgO、Fe2O3, micro alkali metal compound as auxiliary at Point.
The amount of the sulphur-fixing agent auxiliary agent of penetrating is according to the sulfur content in flue gas, is 2 according to Ca/S ratio, and inverse goes out to absorb cigarette Total CaO amount that sulphur in gas needs, the amount of auxiliary agent total CaO meter needed for pressing 2~6%.
2) arrival end of smoke exhaust pipe 4 adds flue gas impeller guide in the annular-heating space 20 of revolution limekiln preheater Water injector 8, this is enabled to:
(1) lime desulphurization reaction is activated, reaction speed is increased；
(2) change flue gas and enter the flow direction in smoke exhaust pipe 4: flue gas flows into the direction of smoke exhaust pipe 4 by axial along smoke exhaust pipe 4 Become tangential along smoke exhaust pipe 4, bring benefit:
A) speed of particulate matter vertical direction reduces, since particle is influenced by gravity, the part correspondingly swept along in flue gas Grain can fall under gravity into preheater upper space, increase calcium oxide and smoke contacts time；
B) under the action of deflector 82, flue gas does high-speed rotational movement in smoke exhaust pipe 4, flue gas mixed with water it is more uniform, Accelerate the heat and mass of water droplet and flue gas, promotes the reaction of calcium oxide, water droplet and sulfur dioxide in flue gas, avoid the stone in flue gas Ashes is reunited because of water suction blocks smoke exhaust pipe 4；
C) water droplet sprayed into is all inhaled into pipeline through 4 tunnel of smoke exhaust pipe under 4 suction function of smoke exhaust pipe, avoids penetrating The preheating of water droplet influence lime building stones.
3) change preheater body construction
Desulfurization reaction optimal temperature section is 800~900 DEG C.Temperature is more than 900 DEG C, and part sulfur retention products can decompose, Reduce overall sulfur-fixing rate；Temperature is lower than 800 DEG C, and reaction rate reduces, and is unfavorable for the quick progress of desulfurization reaction.
Traditional preheater structure is similar to the ring section stretching certain altitude surrounded by inside and outside dodecagon and is formed, Flue gas does cross-section flowing in this space, influences maximum 800~900 DEG C of regions to entire desulphurization reaction and only accounts for the entire bed of material Small part, flue gas stream high speed pass through this region, and the residence time is short, and desulfurization degree is low.
In response to this problem, the present invention designs a kind of novel pre-heater structure, it may be assumed that in 800~900 DEG C of regions of lime building stones, By preheater body construction by prismatic ring structure be variable cross-section ring structure, after the horizontal cross-section in this region first becomes larger Become smaller, eventually pass back to original size, it is therefore an objective to increase building stones in the residence time in 800~900 DEG C of regions.Carry out section design When, the influence for considering the stocking angle of building stones is first had to, the horizontal tilt angle α of the first rake 210 should be slightly less than the accumulation of building stones Angle；Secondly, to consider the influence of the angle of friction of building stones, the horizontal tilt of the second rake 212 in order to not influence the whereabouts of building stones Angle beta should be less times greater than the angle of friction of building stones.
In addition, it is necessary to explanation, can also increase the height in annular-heating space 20 by increasing preheater height Degree, to accomplish that charge level height is adjustable.
In progress preheater design, manufacturing process, increase the surplus in preheater short transverse, in actual production process In, the heating of preheater inner annular can be controlled by changing into and out of doses (such as motion frequency by adjusting push rod device 5) The total height of the bed of material in space 20.Increase inlet amount, reduce load, it will increases bed of material total height, bed of material gap is caused to hinder The increase of power, flue gas flow rate degree reduces, and then flue gas extended residence time in 20 desulfurization section of annular-heating space；On the contrary, Reduce inlet amount, increase load, it will reduces bed of material total height, reduce bed of material gap resistance, flue gas flow rate increases, Jin Eryan Gas shorter residence time in the desulfurization section of preheater.
Present embodiment has the advantages that
Flue gas impeller guide water injector 8 is installed on the entrance of smoke exhaust pipe 4, and flue-gas temperature is at 260~300 DEG C or so herein, water Drop can absorb the heat of flue gas and evaporate, while pulverized limestone will not become paste reunion because of water suction.Moreover, because flue gas Temperature is not high, and water droplet can stop time enough activation desulphurization reaction；
Flue gas impeller guide water injector 8 changes flue gas and enters the mode of smoke exhaust pipe 4, from it is original axially into become tangentially into Enter, flue gas, water droplet, the mixing of pulverized limestone are more uniform, strong, and the heat and mass resistance of water droplet and flue gas is smaller, cigarette under low temperature Desulfurization effect is more preferable；
Due to the Involving velocity of flue gas stream, water droplet will not enter in the annular-heating space 20 of preheater, will not influence lime stone Heat and mass transfer process in annular-heating space 20 will not bring additional influence to the production of lime；
Since water spray area is merely present in inside flue gas impeller guide water injector 8, amount of water sprayed can be less, to smoke temperature drop It influences smaller；
Change preheater interior wall construction, keeps flue gas and the building stones i.e. desulfurization section residence time in 800~900 DEG C of regions more, Optimal desulfurization section stops the more time, can be obviously improved whole desulfuration efficiency；
In the addition of the high temperature section sulphur-fixing agent auxiliary agent in annular-heating space 20, improve sulphur-fixing agent microporous structure, is conducive to solid sulphur Reaction, while there is the substance of high-temperature stability in the covering of sulfur retention products surface, decomposing again for sulfur retention products is reduced, solid sulphur is improved Product decomposition temperature；
The variable section structure of the desulfurization section in the annular-heating space 20 of preheater designs, it is contemplated that the stocking angle and building stones of building stones Angle of friction between inner panel, building stones can preferably fill the annular-heating space 20 of entire preheater in dropping process；
It just considers the surplus capacity of bed depth when preheater design, manufacture, when actual production, adjusts preheater as needed Balance between charging and discharging, and then adjust bed depth inside preheater.
Technology contents and technical characterstic of the invention have revealed that as above, it being understood, however, that in creative ideas of the invention Under, those skilled in the art can make various changes and improve to above structure, protect including individually disclose here or requirement The combination of the technical characteristic of shield, and significantly include other combinations of these features.These deformations and/or combination each fall within this In technical field involved in inventing, and fall into the protection scope of the claims in the present invention.

Claims (10)

1. a kind of revolution limekiln preheater with high-efficiency flue gas desulfurization comprising preheater main body, top feed bin, blanking Pipe, smoke exhaust pipe, push rod device, feeding chute, it is characterised in that further include sulphur-fixing agent auxiliary agent conveyance conduit, the sulphur-fixing agent auxiliary agent is defeated The lower end of pipeline is sent to be provided with nozzle, which is located at the top of feeding chute.
2. the revolution limekiln preheater according to claim 1 with high-efficiency flue gas desulfurization, which is characterized in that described solid Sulphur agent aid conveyance conduit is arranged in the center of the preheater main body.
3. the revolution limekiln preheater according to claim 1 with high-efficiency flue gas desulfurization, which is characterized in that described pre- Hot device main body includes the inner panel and outside plate for surrounding annular-heating space jointly, which includes low-temperature zone, desulfurization section And high temperature section, the desulfurization section are arranged to section from top to bottom and first become larger when becoming smaller again to increase resident in the desulfurization section of material Between.
4. the revolution limekiln preheater according to claim 3 with high-efficiency flue gas desulfurization, which is characterized in that described Inner panel described in desulfurization section has the first rake and the second rake, and first rake is arranged to its horizontal tilt angle and is less than The stocking angle of material, second rake are arranged to the angle of friction that its horizontal tilt angle is greater than between material and the inner panel.
5. the revolution limekiln preheater according to claim 4 with high-efficiency flue gas desulfurization, which is characterized in that in described Plate is additionally provided with vertical portion between first rake and second rake.
6. the revolution limekiln preheater according to claim 3 with high-efficiency flue gas desulfurization, which is characterized in that described de- The temperature setting of sulphur section is 800~900 DEG C.
7. the revolution limekiln preheater according to any one of claims 1 to 6 with high-efficiency flue gas desulfurization, feature exist In further including flue gas impeller guide water injector, which is installed in the arrival end of the smoke exhaust pipe.
8. the revolution limekiln preheater according to claim 7 with high-efficiency flue gas desulfurization, which is characterized in that the cigarette Cyclonic current water conservancy diversion water injector includes upper fixed ring, bottom plate, is installed on lower solid top plate and leads towards the flue gas eddy flow Nozzle, the water pipe being connect with nozzle, multiple water conservancy diversion for being fixed between upper fixed ring and bottom plate inside stream water injector Plate, an internal imaginary circle tangential distribution of multiple deflector around the flue gas impeller guide water injector.
9. the revolution limekiln preheater according to claim 8 with high-efficiency flue gas desulfurization, which is characterized in that described more A deflector is evenly distributed along the internal imaginary circle.
10. the revolution limekiln preheater according to claim 9 with high-efficiency flue gas desulfurization, which is characterized in that described The radius of internal imaginary circle is the half of the radius of the smoke exhaust pipe.
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