CN107754591A - A kind of high-efficient atomizing desulfurizer and method - Google Patents
A kind of high-efficient atomizing desulfurizer and method Download PDFInfo
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- CN107754591A CN107754591A CN201711158089.4A CN201711158089A CN107754591A CN 107754591 A CN107754591 A CN 107754591A CN 201711158089 A CN201711158089 A CN 201711158089A CN 107754591 A CN107754591 A CN 107754591A
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- lime slurry
- lime
- preheater
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- 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
- B01D53/80—Semi-solid phase processes, i.e. by using slurries
-
- 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
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/502—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific solution or suspension
-
- 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
- B01D53/86—Catalytic processes
- B01D53/8603—Removing sulfur compounds
- B01D53/8609—Sulfur oxides
-
- 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
- B01D53/86—Catalytic processes
- B01D53/88—Handling or mounting catalysts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/40—Alkaline earth metal or magnesium compounds
- B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/30—Sulfur compounds
- B01D2257/302—Sulfur oxides
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/12—Methods and means for introducing reactants
- B01D2259/126—Semi-solid reactants, e.g. slurries
Abstract
The invention discloses a kind of high-efficient atomizing desulfurizer, the device includes pulverized limestone feeding and stocking system, lime slurry preparation system, lime slurry transfer system, lime slurry stocking system, lime slurry spraying system, desulphurization catalyst stocking system and desulphurization catalyst spraying system；The outlet of the pulverized limestone feeding and stocking system is connected with the entrance of the lime slurry preparation system；The outlet of the lime slurry preparation system is connected by the lime slurry transfer system with the entrance of the lime slurry stocking system；The outlet of the lime slurry stocking system is connected by the lime slurry transfer system with the entrance of the lime slurry spraying system；The outlet of the desulphurization catalyst stocking system is connected with the entrance of the desulphurization catalyst spraying system.In addition, invention additionally discloses a kind of high-efficient atomizing sulfur method.The present invention is simple in construction, and low input, low cost, low energy consumption, desulfuration efficiency are up to more than 95%；SO3Almost all removes.
Description
Technical field
The present invention relates to field of environment protection, and in particular to the desulfurization of cement producing line, more particularly to a kind of high-efficient atomizing
Desulfurizer；A kind of moreover, it relates to high-efficient atomizing sulfur method.
Background technology
First, the source of sulphur and existing form in cement production process
Mainly there are two approach in the source of sulphur in cement production process, and one is derived from raw material, and two are derived from fuel.It is raw
The sulphur content for expecting to contain is organic sulfur, sulfide and sulfate.
Table 1：Raw material contain Sulfur Analysis
Organic sulfur is the organic compound of sulphur, and sulfide is mainly FeS2And a small amount of PbS, ZnS, sulfate mainly have
CaSO4、Na2SO4、K2SO4.In pre-heating system, when temperature of charge is less than 200 DEG C, organic sulfur is into SO2, and in material
When temperature is 400-600 DEG C, FeS2It is oxidized, generates Fe2O3And SO2.Organic sulfur and the SO of sulfide-oxidation generation2Lead to flue gas
Top preheater is crossed to raw mill and preheater, in the process, SO2With CaCO3Effect, generate CaSO3And CO2.In preheater
In system, the SO of organic sulfur and sulfide-oxidation generation2, generally there is 50-55% and CaCO3Effect, remaining 45-50% SO2
Exclude pre-heating system.
In raw material mill, bag dust collecting system, still there is a certain amount of SO2With CaCO3Act on, lime stone (CaCO in raw mill3) hold
It is continuous to produce fresh surface, while powder has the longer residence time；Gas temperature generally has been reduced to 200 DEG C in other raw mill
Hereinafter, therefore relative humidity is higher.Although lower temperature can reduce desulphurization reaction speed, the material for considering to participate in reaction is gathered around
There are huge response area, longer residence time, while vapor also can promote desulphurization reaction to carry out, sulphur is de- in raw mill
Except rate is still very considerable.
Sulfate in raw material, generally melting temperature, decomposition temperature, volatilization temperature are higher, as clinker into
It is divided into kiln.
The existence form of sulphur in fuel has sulfide, sulfate to also have organic sulfur as in raw material.Fuel is dividing
Solve stove or rotary kiln burning generation SO2, substantial amounts of active CaO be present in dore furnace, while the temperature of dore furnace is exactly desulfurization
React the optimum range occurred, therefore SO caused by clinkering zone2Gas can be absorbed in dore furnace by CaO or in intermediate zone and
Clinkering zone is combined generation sulfate with alkali.Part of sulfuric acid salt acts on during clinker burning if it reducing atmosphere be present with C,
Decompose to give off SO2, generation sulfate is then reuptaked again, forms sulfur cycle；And the sulfate not being decomposed then turns into ripe
Expect component.That is under normal circumstances, the sulphur in fuel seldom influences whether the discharge of sulphur.But meeting in the case of these below
Make an exception：
(1) burning of fuel is carried out under reduction situation；
(2) burnability of raw material is very poor, and burning zone temperature is raised very high；
(3) sulfurbased NPK is substantially higher.
2nd, traditional desulfurization technology has in-furnace calcium spraying, hot raw material spray, wet desulphurization etc., its technical indicator and main bad
Gesture is shown in such as table 2 below：
Table 2
Need a kind of desulfurizer and method that can overcome above-mentioned traditional desulfurization technological deficiency of research and development badly in this area.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of high-efficient atomizing desulfurizer, the present apparatus is simple in construction, low throwing
Enter, low cost, low energy consumption, high efficiency, construction cost is the 1/5 of wet desulphurization, and operating cost is the 1/3 of other desulfurization technologies.
Desulfuration efficiency is up to more than 95%；SO3Almost all removes.Therefore, the present invention also provides a kind of high-efficient atomizing sulfur method.
In order to solve the above technical problems, the present invention provides a kind of high-efficient atomizing desulfurizer, the device is included on pulverized limestone
Material and stocking system, lime slurry preparation system, lime slurry transfer system, lime slurry stocking system, lime slurry injection
System, desulphurization catalyst stocking system and desulphurization catalyst spraying system；The outlet of the pulverized limestone feeding and stocking system with
The entrance connection of the lime slurry preparation system；Shifted by the lime slurry outlet of the lime slurry preparation system
System is connected with the entrance of the lime slurry stocking system；The outlet of the lime slurry stocking system passes through the lime white
Liquid transfer system is connected with the entrance of the lime slurry spraying system；The outlet of the desulphurization catalyst stocking system with it is described
The entrance connection of desulphurization catalyst spraying system.
As currently preferred technical scheme, the pulverized limestone feeding and stocking system include lime powder tank car, lime
Powder cabin, deduster；Feeding port is left on the lime powder bin top, and feeding port is connected with the lime powder tank car, the pulverized limestone
The top of the warehouse is provided with deduster.
As currently preferred technical scheme, the lime powder bin top is cylindrical, and bottom is tapered, lime powder bin
Tapered lower portion connects compressed air reservoir.
As currently preferred technical scheme, the lime slurry preparation system include digester, digestion jar agitator,
Wet scrubber；Digestion jar agitator is provided with the digester, wet scrubber is set at the top of the digester.
As currently preferred technical scheme, the lime powder bin bottom is from top to bottom provided with hand operated gate valve, star-like
Dispenser；Small feed bin of weighing is provided with the top of the digester, the star-like feeder and the small feed bin of weighing pass through spiral transferring
Machine is sent to connect.
As currently preferred technical scheme, the lime slurry transfer system is pump.
As currently preferred technical scheme, the lime slurry stocking system is holding vessel, is matched somebody with somebody inside the holding vessel
There is agitator.
As currently preferred technical scheme, the lime slurry spraying system includes conditioning Tower, raw mill, preheating
Device；Spray gun is equipped with the conditioning Tower, raw mill and preheater, the spray gun gas circuit is connected with the compressed air reservoir；
The desulphurization catalyst spraying system includes catalyst transport dedicated pump and preheater；The desulphurization catalyst stocking system goes out
Mouth is connected by the catalyst transport dedicated pump with the entrance of the preheater.
In addition, the present invention also provides a kind of process that high-efficient atomizing desulfurization is carried out using described device, including it is as follows
Step：
(1) the pulverized limestone feeding and stocking system collect pulverized limestone and pulverized limestone are delivered into the lime slurry and prepare
System；
(2) pulverized limestone and water stirring reaction are generated lime slurry by the lime slurry preparation system, and are transferred to described
Lime slurry stocking system；Conditioning Tower, raw mill and preheater correct position are delivered to again；
(3) desulphurization catalyst sets catalyst storage tank, and the suitable position of preheater is delivered to by desulphurization catalyst dedicated pump
Put；
(4) lime slurry and smoke reaction, desulphurization catalyst and preheater in flue gas at the top of conditioning Tower or raw mill airduct
Flue gas is reacted at correct position uptake flue, so as to reach desulfurized effect.
As currently preferred technical scheme, in step (4), when raw mill is not shut down, when sulfur dioxide concentration is exceeded,
Calcium hydroxide slurries are atomized penetrating by atomizing lance at the top of conditioning Tower, and it is suitable that desulphurization catalyst by atomizing lance is ejected into preheater
Position so that calcium hydroxide slurries and flue gas hybrid reaction at the top of conditioning Tower, desulphurization catalyst rise cigarette with preheater correct position
Flue gas is reacted at road, so as to reach the purpose for reducing SO2 in firing system flue gas；
When raw mill is shut down, when sulfur dioxide concentration is exceeded, calcium hydroxide slurries are closed by atomizing lance in raw mill blast pipe
It is atomized and sprays at suitable temperature window, desulphurization catalyst is ejected into preheater correct position by atomizing lance so that calcium hydroxide slurries
With raw mill wind inner tube smoke hybrid reaction, desulphurization catalyst is reacted with flue gas at preheater correct position uptake flue,
So as to reach the purpose for reducing SO2 in firing system flue gas；
Calcium hydroxide slurries and desulfurizing agent are pumped into by the way that calcium hydroxide slurry feeding pump and catalyst transport are special respectively
Corresponding position is reacted, and is started simultaneously, can play the effect of desulfurization, the dosage specifically sprayed is according to titanium dioxide
The concentration of sulphur is adjusted.
The principle of the present invention is illustrated below：
1 quicklime slaking
NSDD desulfurization technology is with quick lime (CaO) for absorbent, and in digester plus quick lime is prepared into calcium hydroxide by water
(Ca(OH)2) slurries, then by calcium hydroxide (Ca (OH)2) slurries penetrating flue.Absorbent mixes with flue gas in flue
Splice grafting touches, and strong physical-chemical reaction occurs, on the one hand with SO in flue gas2Reaction generation calcium sulfite, another aspect flue gas
Cooling, absorbent moisture evaporation are dried, and reach removing SO2Purpose, while produce solid, powdery desulfurizing byproduct.
The evaporation of 2 slurry drops
Drop since evaporation to the drying required time, it is extremely important to desulfurization degree.Influence the droplet drying time because
It is known as droplet size, drop water content and becomes into the temperature value of adiabatic saturation.
The slurry drop that atomizer comes out, can be considered isolated Ca (OH)2Continuous liquid phase is dispersed with around particle.Absorbent
Grain dissolving in the liquid phase, saturation state is in slurry drips.The drying of drop is roughly divided into two stages：First stage is due to slurry
Solids content is little in feed liquid drop, substantially belongs to freely evaporating for droplet surface water, evaporation rate relative constancy soon.Moisture
Evaporation occur on the surface of slurry drop, this stage is referred to as constant rate drying period.There are about 50% absorbing reaction occur in the rank
Section, required time is about 1 to 2 second.
With the progress of evaporation, the volume of liquid phase is constantly reduced, and until solid particle is in contact, is collected at the table of slurry drop
Face forms a fixed barrier layer, and which limit the evaporation of moisture and SO2Absorption speed, this stage is referred to as reduction of speed
Drying stage.Finally, most of free aqueous phases in product solid are evaporated, and see Fig. 1.
Flue sprayer unit, the device is used to reduce flue-gas temperature to former reaction product progress humidification activation, by humidification
The Ca (OH) being located at originally after activation inside reactant layer2Migrated inside particle to surface, and form sub-micron
Level particulate, is deposited on particle surface or is mutually mingled with top layer product layer.Migration also changes the pore structure of locality.These are comprehensive
Closing effect makes reactant regain reactivity.Simultaneously by with fierce turbulence, the particle that possesses huge surface area makees
For carrier, sufficiently evaporated in flue, ensure that the ash into follow-up deduster has good flow regime.
SO in 3 flue gases2Absorption
In reactor is spray-dried, lime slurry be atomized for fine lime slurry droplet (<100 μm) with high-temperature flue gas phase
Contact, mass transfer, the heat transfer effect of complexity occur between gas, liquid, solid three-phase.In slurry drop while moisture evaporation, the SO in flue gas2
Absorbed and the Ca (OH) in slurry drop2Particle reacts, and finally obtains dry CaSO4、CaSO3With unreacted Ca (OH)2
Solid mixture, collect through dust collecting system.
4 chemical reaction processes
Ca(OH)2(s)+SO2(g)+H2O(s)→CaSO3(s)+2H2O(g) (I)
Reaction can be divided into following steps：
(1) quicklime slaking
CaO(S)+H2O(l)→Ca(OH)2(l) (3)
(2) diffusions of the SO2 from gas phase main body to droplet surface
SO2(g)→SO2(aq) (4)
(3) the SO2 dissociation generations HSO dissolved in liquid phase3 -And SO3 2-
(4) HSO of liquid phase dissolved3 -、SO3 2-The diffusion of ion in the liquid phase
(5)Ca(OH)2The dissolving of particle
Ca(OH)2(S)→Ca2+(aq)+2OH-(aq) (7)
(6) generation of calcium sulfite
(7) CaSO in drop3Supersaturated Precipitation
CaSO3(aq)→CaSO3(s) (9)
(8) part CaSO3(aq) oxygen being dissolved in drop is oxidized to CaSO4
(9)CaSO4Water is insoluble in, will Precipitation solid-state CaSO rapidly4
CaSO4(aq)→CaSO4(s) (11)
The progress of key reaction (4), (5), (6) and (7) is completed in the liquid phase, and the evaporation rate of moisture is direct in slurry drop
Affect SO2Removing.
5 catalytic desulfurizations
In SO2Accumulation regions C2To C1Suitable temperature range at uptake flue, atomization spray into activated desulphurization catalyst
Solution, make desulphurization catalyst (preferably NSDD- materials) quickly with the SO in flue gas2, promote raw material and desulfurizing agent to fix in flue gas
SO2。
NSDD- material high-efficient atomizing desulfurization technologies have simple system, operation maintenance side compared with traditional wet desulphurization
Just, small investment, operating cost are low, the advantages that being discharged without lime-ash.
NSDD- material high-efficient atomizing sulfur removal technologies make absorbent with quick lime (main component is CaO).Quick lime is through curing
(main component is Ca (OH) to the white lime for becoming to have preferable respond2) slurries.White lime slurries are through filling atomizer injection
Into uniform droplet, its mist particle diameter is less than 100 μm.These particulates have very big specific surface area, with containing titanium dioxide in flue
Sulphur smoke contacts, occur strong heat exchange and chemical reaction, and the moisture in lime white droplet is evaporated by the sensible heat of flue gas, and two
Sulfur oxide is absorbed by lime slurry droplet simultaneously.
When opening raw mill, droplet is reacted by entering to grind the sulfur dioxide that flue enters in mill and in flue gas, due to humidity in mill
Greatly, reactant residence time is grown, SO2Removal effect is considerable, and product together enters kiln with material and is fixed in clinker；Desulfurization is urged
Agent is in SO2Accumulation regions C2To C1Rise atomization at airduct and spray into activated desulfurization catalyst agent solution, extend the anti-of desulfurizing agent
Between seasonable, the contact area between material is increased, effectively the SO of capture escape2, raw material and desulfurizing agent can be promoted to fix flue gas
In SO2。
Influence SO2The factor of clearance includes degree of the flue gas exit temperature close to adiabatic saturation temperature, absorbent equivalent
Than and SO2Entrance concentration.In NSDD- new material high-efficient atomizing sulfur removal technologies, other sour gas in flue gas are SO3Deng
Also can simultaneously with Ca (OH)2Reaction, and SO3Removal efficiency is up to 90%, much larger than SO in wet desulfurizing process3Removal efficiency.Should
System flue gas pressures drop is moderate, and absorbing liquid conveying capacity is small, and system energy consumption is relatively low；The course of work cleans, and no waste water produces；Product
For solid-state, it is easily processed；Flow is simple, equipment is reliable, easy to run and safeguarded.
Compared with prior art, the beneficial effects of the present invention are：
1st, simple system, low input, low cost, low energy consumption, high efficiency, construction cost is the 1/5 of wet desulphurization, is run into
Originally it is the 1/3 of other desulfurization technologies.
2nd, desulfurization rapidly：Initial sulphur emissions<500mg/Nm3, feed intake 5 minutes SO2Discharge is rapidly reduced to 50mg/Nm3With
Under, desulfuration efficiency is up to more than 95%；SO3Almost all removes.
3rd, it is reliable, dirt and blocking will not be produced；Desulfurization product is dry state, is easily handled, and no waste water produces；For
The corrosivity of equipment is not high, and equipment need not do anti-corrosion.
4th, effect integrates：Desulfurizing agent uses rear clinker high early strength lifting 1MPa or so, NOXReduce 30-80mg/Nm3。
5th, floor space is small, and installed power is small, and the construction period is no more than 60 days.
Brief description of the drawings
Fig. 1 is a kind of desulfurization principle schematic diagram of NSDD-new material high-efficient atomizing desulfurizer of the present invention.
Fig. 2 is a kind of structural representation of NSDD-new material high-efficient atomizing desulfurizer of the present invention.
Fig. 3 is the structural representation of the compressed air system of the present invention.
Description of reference numerals is as follows in figure：
1 is lime powder tank car；2 be lime powder bin；3 be deduster；4 be compressed air reservoir；5 be hand operated gate valve；6 are
Star-like feeder；7 be conveying worm；8 be small feed bin of weighing；9 be digester；10 be digestion jar agitator；11 be that wet type is removed
Dirt device；12 be calcium hydroxide slurries shifting pump；13 be holding vessel；14 be storage jar agitator；15 be calcium hydroxide slurry feeding pump；16
It is conditioning Tower；17 be raw mill；18 be preheater；19 be catalyst tank；20 be catalyst transport dedicated pump, and 21 be in conditioning Tower
Spray gun, 22 be spray gun in raw mill, and 23 be spray gun in preheater.
Embodiment
With reference to specific embodiment, the present invention is furture elucidated, but these embodiments are only intended to the explanation present invention, and
The scope of the present invention is not limited.
Embodiment
As shown in Fig. 2 the present invention provides a kind of NSDD-new material high-efficient atomizing desulfurizer, including pulverized limestone feeding and
Stocking system (including lime powder tank car 1, lime powder bin 2, deduster 3), lime slurry preparation system (including digester 9, digestion
Jar agitator 10, wet scrubber 11), lime slurry transfer system (calcium hydroxide slurries shifting pump 12), lime slurry storage system
System (holding vessel 13, storage jar agitator 14), lime slurry spraying system (calcium hydroxide slurry feeding pump 15, conditioning Tower 16, raw material
Mill 17, preheater 18, be equipped with spray gun in conditioning Tower 16, raw mill 17 and preheater 18), desulphurization catalyst stocking system (urges
Agent tank 19), desulphurization catalyst spraying system (catalyst transport dedicated pump 20, preheater 18), (compression is empty for compressed air system
Gas storage tank 4) etc. composition.
Feeding port is left on the top of lime powder bin 2, and feeding port is connected with lime powder tank car 1, and the top of lime powder bin 2 is provided with dedusting
Device 3, ensure there is no airborne dust at the top of powder cabin in discharging.The top of lime powder bin 2 is cylindrical, and bottom is tapered, the cone of lime powder bin 2
Shape bottom (i.e. tapering) is then passed through compressed air, and it is in fluidized state to make quick lime in lime powder bin 2, avoids quick lime from gluing wall knot arch
And it is difficult to blanking, compressed air is then provided by dosing area compressed air reservoir 4.The specific weight of quick lime discharging is then small by weighing
Feed bin 8 is measured, and the lime powder to get off passes sequentially through hand operated gate valve 5, star-like feeder 6, conveying worm 7 and is delivered to
Weigh small feed bin 8 (hand operated gate valve 5 be used for control either on or off allow lime out of powder cabin under to conveying worm 7, it is star-like to give
Glassware 6 can adjust the speed that conveying worm 7 is arrived under lime with variable frequency adjustment), weigh what small feed bin 8 covered with digester 9
Water mixes, and by the stirring of the digestion jar agitator 10 of the inside of digester 9 configuration, it is molten to be prepared into certain density calcium hydroxide
Liquid.The top of digester 9 sets wet scrubber 11, prevents having flue dust to emerge during slurries are prepared.Prepare disappearing for completion
Lime slurry is transferred in holding vessel 13 by calcium hydroxide shifting pump 12, and the inside of holding vessel 13 is furnished with agitator 14 to prevent niter
Isolation precipitation occurs for grey slurries, and the outlet of holding vessel 13 connection calcium hydroxide slurry feeding pump 15, slurries are conveyed by calcium hydroxide slurries
Pump 15 is delivered to conditioning Tower 16, raw mill 17 and the correct position of preheater 18.In conditioning Tower 16, raw mill 17 and preheater 18
Provided with spray gun.
Atomizing lance is provided with raw mill 17, calcium hydroxide slurries are by atomizing lance in the blast pipe suitable temperature window of raw mill 17
It is atomized and sprays at mouthful so that calcium hydroxide slurries and the wind inner tube smoke hybrid reaction of raw mill 17, so as to reach reduction firing system
SO in flue gas2Purpose；When raw mill 17 is shut down, calcium hydroxide slurries spray into conditioning Tower 16 and carry out desulphurization reaction after atomization.
The storage of desulphurization catalyst sets catalyst tank 19, and by manually filling into, catalyst tank 19 exports setting and urged catalyst
Agent transport dedicated pump 20, desulphurization catalyst is injected to by the spray gun in catalyst transport dedicated pump 20 and preheater 18 pre-
The hot correct position of device 18 is reacted together with the calcium hydroxide slurries conveyed by calcium hydroxide slurry feeding pump 15, reaches quick solid
The purpose of sulphur.
When raw mill 17 is not shut down, when sulfur dioxide concentration is exceeded, calcium hydroxide slurries are pushed up by atomizing lance in conditioning Tower 16
Portion's atomization sprays into, and desulphurization catalyst is ejected into the correct position of preheater 18 by atomizing lance so that calcium hydroxide slurries and conditioning Tower
16 top flue gas hybrid reactions, desulphurization catalyst is reacted with flue gas at the correct position uptake flue of preheater 18, so as to reach
To the purpose for reducing SO2 in firing system flue gas；
When raw mill 17 is shut down, when sulfur dioxide concentration is exceeded, calcium hydroxide slurries are by atomizing lance in the air intake of raw mill 17
It is atomized and sprays at pipe suitable temperature window, desulphurization catalyst is ejected into the correct position of preheater 18 by atomizing lance so that niter
Grey slurries and the wind inner tube smoke hybrid reaction of raw mill 17, desulphurization catalyst and flue gas at the correct position uptake flue of preheater 18
Reacted, so as to reach the purpose for reducing SO2 in firing system flue gas；
Calcium hydroxide slurries and desulfurizing agent are defeated by calcium hydroxide slurry feeding pump 15 and catalyst transport dedicated pump 20 respectively
It is sent to corresponding position to be reacted, and starts simultaneously, the effect of desulfurization can be played, the dosage specifically sprayed is according to two
The concentration of sulfur oxide is adjusted.
The desulfurizing agent that this sulfur removal technology uses easily takes the mode in locality purchase, desulfurization catalyst for dry state calcium lime powder
Agent is preferably NSDD- materials (melting Ingegneria Ambientale SRL purchased from Shanghai three).
High-efficient atomizing desulfurizer of the present invention mainly includes following system：Quick lime feeding and stocking system；Raw stone
Grey digestion reaction system；Calcium hydroxide stocking system；Slurries spraying system；Desulphurization catalyst stocking system；Desulphurization catalyst sprays
System；Automation control system；Compressed air system；The anti-corrosion of tank body and pipeline, insulation, flushing and security protection etc. are supporting auxiliary
Help facility.
1) quick lime feeding and stocking system
Outsourcing quick lime (purity ＞ 85%) is conveyed into factory by lime powder tank car 1, the air carried using lime powder tank car 1
Quick lime is delivered to lime powder bin 2 by compressor, and the weighed small feed bin 8 of quick lime is delivered to digester 9 after measuring.Lime powder bin
2 tops set dedusters 3 (for example, high-efficiency bag type dust remover), and maximum dust content is less than 30mg/ in the clean gas after dedusting
Nm3.The tapering of lime powder bin 2 is then passed through compressed air, and it is in fluidized state to make quick lime in lime powder bin 2, avoids quick lime from gluing
Wall knot encircles and is difficult to blanking, and the specific weight of quick lime discharging is then measured by small feed bin 8 of weighing.In addition, quick lime Cang2Ding
Portion is provided with roof scrubber 3, the convenient maintenance of the manhole door of sealing, and the door is designed to be opened rapidly with hinge and handle, and
And emergency vent valve is arranged at top, to prevent powder cabin pressure it is excessive when rapid pressure release.
2) lime slurry preparation system
Quick lime reacts generation aqua calcis in digester 9 with water, in the case where controlling certain water, continues
Increase quick lime, in the presence of jar agitator 10 is digested, form the calcium hydroxide slurries that mass concentration is 15% to 30%.
3) lime slurry stocking system
Calcium hydroxide slurries are delivered to calcium hydroxide holding vessel 13 through calcium hydroxide shifting pump 12, and the top of calcium hydroxide holding vessel 13 is furnished with
Agitator 14 is to prevent calcium hydroxide slurries from isolation precipitation occurs, and the calcium hydroxide breast of allotment is after flowmeter measures in calcium hydroxide
Spraying system is delivered in the presence of slurry feeding pump 15.
Digester 9 and holding vessel 13, using carbon steel anti-corrosion material and it is equipped with waste liquid rinse-system；Liquid level gauge and peace are set
Full relief valve, tank level can be detected in real time, ensure that equipment is safe for operation；Slurries pump two (the using and the reserved) is configured to ensure
The reliability of desulphurization system.
4) lime slurry spraying system
Calcium hydroxide slurries are atomized in the blast pipe suitable temperature window of raw mill 17 by atomizing lance and sprayed into so that calcium hydroxide
Slurries and the wind inner tube smoke hybrid reaction of raw mill 17, SO in firing system flue gas is reduced so as to reach2Purpose；Work as raw mill
During 17 shutdown, calcium hydroxide slurries spray into conditioning Tower 16 and carry out desulphurization reaction after atomization.
5) desulphurization catalyst stocking system and desulphurization catalyst spraying system
The storage of desulphurization catalyst sets catalyst tank 19, and by manually filling into, catalyst tank 19 exports setting and urged catalyst
Agent transport dedicated pump 20, desulphurization catalyst is injected to by the correct position of preheater 18 by catalyst transport dedicated pump 20 and carried out
Reaction, reach the purpose of quick sulphur admittedly.
6) automation control system
Whole system is controlled using PLC, and data communication is kept with main process control system DCS.Using high performance liquid
Electromagnetic flowmeter accurately detects fluid flow, and couples with controller and other relevant devices.It can be supervised at any time using flowmeter
The simultaneously actual discharge rate of display system is controlled, while if when pump/pipeline/element occurs unexpected, system at once can be from the change of flow
Obtain relevant information to provide alarm and take pre-set scheme, system is easy to use, maintenance is timely.
7) compressed air system
As shown in figure 3, compressed air system is mainly the spray gun set into conditioning Tower 16, raw mill 17 and preheater 18
21st, 22,23 low pressure purge gas is provided to spray gun when conveying gases at high pressure and the shutdown for atomization.The gas circuit of spray gun 21,22,23
It is connected with compressed air reservoir 4；Gas pressure is controlled in 0.4Mpa to 0.6MPa, system-down (no during system normal operation
During spraying), it also should normally supply, for cooling spray and prevent spray gun from blocking.The compressed air of the present invention is quoted from existing pressure
Contracting air duct is grid-connected, and desulphurization system sets compressed air reservoir 4, and compressed air enters spray gun after leaving compressed air reservoir 4
21st, 22,23, setting compressed air, the pressure gauge of calcium hydroxide slurries carry out the mist of spray gun before all imports of spray gun 21,22,23
Change control and shunting uses.Connection by metal hose is used between spray gun 21,22,23 and pipeline, spray gun is arranged as removably,
Site setup spray gun bearing, the dismounting of spray gun is carried out using manual mode.When spray gun overhauls or does not need work, artificial handle
Spray gun is extracted out out of system, is temporarily placed on live support.Spray gun cleans to be carried out using compressed air.
High-efficient atomizing desulfurizer of the present invention and method are shown in Table 3 with the contrast of traditional desulfurization technology the key technical indexes：
Table 3
It can be seen that it is of the invention compared with traditional desulfurization technology, there is following clear superiority：Reduced investment, operating cost is low, takes up an area
Small, energy consumption is low, and desulfuration efficiency is high, and desulfurization rate is fast, no lime-ash discharge.
Claims (10)
1. a kind of high-efficient atomizing desulfurizer, it is characterised in that the device includes pulverized limestone feeding and stocking system, lime slurry
Preparation system, lime slurry transfer system, lime slurry stocking system, lime slurry spraying system, desulphurization catalyst storage system
System and desulphurization catalyst spraying system；The outlet of the pulverized limestone feeding and stocking system and the lime slurry preparation system
Entrance connects；The outlet of the lime slurry preparation system is stored by the lime slurry transfer system and the lime slurry
The entrance connection of system；The outlet of the lime slurry stocking system passes through the lime slurry transfer system and the lime white
The entrance connection of liquid spraying system；The outlet of the desulphurization catalyst stocking system and entering for the desulphurization catalyst spraying system
Mouth connection.
2. device as claimed in claim 1, it is characterised in that the pulverized limestone feeding and stocking system include pulverized limestone tank
Car, lime powder bin, deduster；Feeding port is left on the lime powder bin top, and feeding port is connected with the lime powder tank car, described
Deduster is provided with the top of lime powder bin.
3. device as claimed in claim 1 or 2, it is characterised in that the lime powder bin top is cylindrical, and bottom is tapered,
The tapered lower portion connection compressed air reservoir of lime powder bin.
4. device as claimed in claim 1 or 2, it is characterised in that the lime slurry preparation system includes digester, digestion
Jar agitator, wet scrubber；Digestion jar agitator is provided with the digester, wet dust removal is set at the top of the digester
Device.
5. device as claimed in claim 4, it is characterised in that the lime powder bin bottom is from top to bottom provided with Manual flashboard
Valve, star-like feeder；Small feed bin of weighing is provided with the top of the digester, the star-like feeder and the small feed bin of weighing pass through
Conveying worm connects.
6. device as claimed in claim 1, it is characterised in that the lime slurry transfer system is pump.
7. device as claimed in claim 1, it is characterised in that the lime slurry stocking system is holding vessel, the holding vessel
It is furnished with agitator in inside.
8. device as claimed in claim 3, it is characterised in that the lime slurry spraying system include conditioning Tower, raw mill,
Preheater；Spray gun is equipped with the conditioning Tower, raw mill and preheater, the spray gun gas circuit connects with the compressed air reservoir
Connect；The desulphurization catalyst spraying system includes catalyst transport dedicated pump and preheater；The desulphurization catalyst stocking system
Outlet be connected by the catalyst transport dedicated pump with the entrance of the preheater.
9. a kind of process that high-efficient atomizing desulfurization is carried out using claim 1 described device, it is characterised in that including as follows
Step：
(1) the pulverized limestone feeding and stocking system, which collect pulverized limestone and pulverized limestone are delivered into the lime slurry, prepares system
System；
(2) pulverized limestone and water stirring reaction are generated lime slurry by the lime slurry preparation system, and are transferred to the lime
Slurry storage system；Conditioning Tower, raw mill and preheater correct position are delivered to again；
(3) desulphurization catalyst sets catalyst storage tank, and preheater correct position is delivered to by desulphurization catalyst dedicated pump；
(4) lime slurry and smoke reaction in flue gas at the top of conditioning Tower or raw mill airduct, desulphurization catalyst are suitable with preheater
Flue gas is reacted at the uptake flue of position, so as to reach desulfurized effect.
10. method as claimed in claim 9, it is characterised in that in step (4), when raw mill is not shut down, sulfur dioxide concentration
When exceeded, calcium hydroxide slurries are atomized penetrating by atomizing lance at the top of conditioning Tower, and desulphurization catalyst is ejected into pre- by atomizing lance
Hot device correct position so that calcium hydroxide slurries and flue gas hybrid reaction at the top of conditioning Tower, desulphurization catalyst and the suitable position of preheater
Put flue gas at uptake flue to be reacted, so as to reach the purpose for reducing SO2 in firing system flue gas；
When raw mill is shut down, when sulfur dioxide concentration is exceeded, calcium hydroxide slurries are properly warm in raw mill blast pipe by atomizing lance
Spend to be atomized at window and spray into, desulphurization catalyst is ejected into preheater correct position by atomizing lance so that calcium hydroxide slurries and life
Material mill wind inner tube smoke hybrid reaction, desulphurization catalyst are reacted with flue gas at preheater correct position uptake flue, so as to
Reaching reduces the purpose of SO2 in firing system flue gas；
Calcium hydroxide slurries and desulfurizing agent are pumped into accordingly by the way that calcium hydroxide slurry feeding pump and catalyst transport are special respectively
Position reacted, and start simultaneously, the effect of desulfurization can be played, the dosage specifically sprayed is according to sulfur dioxide
Concentration is adjusted.
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| WO2022094917A1 (en) * | 2020-11-06 | 2022-05-12 | 桂林市深能环保有限公司 | Lime slurry preparation system for waste incineration plant |
| CN115155286A (en) * | 2022-05-31 | 2022-10-11 | 江苏亿金环保科技有限公司 | Low-concentration dry-wet combined desulfurization system |
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Address after: Room B125, No. 45, Shanggang San Village, Sanlin Town, Pudong New Area, Shanghai, 200123 Applicant after: SHANGHAI SANRONG ENVIRONMENTAL PROTECTION ENGINEERING Co.,Ltd. Applicant after: Shanghai Sancheng New Material Technology Co.,Ltd. Address before: Room B125, No. 45, Shanggang San Village, Sanlin Town, Pudong New Area, Shanghai, 200123 Applicant before: SHANGHAI SANRONG ENVIRONMENTAL PROTECTION ENGINEERING Co.,Ltd. Applicant before: SHANGHAI SANCHENG ENERGY TECHNOLOGY Co.,Ltd. |