CN104607010B - Flue gas dust removal desulfurization tower and flue gas desulfurization method - Google Patents
Flue gas dust removal desulfurization tower and flue gas desulfurization method Download PDFInfo
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- CN104607010B CN104607010B CN201310540454.3A CN201310540454A CN104607010B CN 104607010 B CN104607010 B CN 104607010B CN 201310540454 A CN201310540454 A CN 201310540454A CN 104607010 B CN104607010 B CN 104607010B
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Abstract
The present invention discloses a flue gas dust removal desulfurization tower and a desulfurization method. The reactor of the present invention comprises a pre-treatment unit and a deep treatment unit, wherein the two units form an H-shaped double-tower structure, the pre-treatment unit comprises a flue gas inlet, a first-stage spraying system, a spindle-shaped regular packing assembly, a turbulent scrubber and a first-stage liquid holding tank from top to bottom, the deep treatment unit comprises a second-stage liquid holding tank, a packing assembly, a demister assembly and a purified flue gas outlet from bottom to top, and the pre-treatment unit and the deep treatment unit are communicated through the flue gas channel on the middle portion. According to the reactor of the present invention, the spindle-shaped regular packing assembly and the high level potential energy of the turbulent scrubber absorbing liquid can be utilized to concurrently pre-treat the flue gas, and the desulfurization tower has advantages of high contaminant removal rate, low energy consumption and the like, and is especially for the dust removal desulfurization process of high dust content flue gas.
Description
Technical field
The invention discloses a kind of flue-gas dust-removing and desulfurization tower and fume desulphurization method, belong to field of environment protection it is adaptable to
Flue gas and process tail gas dust-removal and desulfurizing are processed, and can be widely applied to the fields such as petrochemical industry and environmental protection.
Background technology
In Chinese atmospheric pollution, acid rain and floating dust are topmost pollutions.During the last ten years, due to sulfur dioxide and nitrogen
The discharge capacity of oxide day by day increases, and the problem of acid rain is more and more prominent.China has been be only second to Europe and North America the now
Three big Acid Rain Zones.SO2It is the major reason causing China's atmospheric pollution with dust, be also the air dirt of the current priority control of China
Dye thing.China SO2For years more than 20,000,000 tons, total emission volumn reaches 25,490,000 tons to total emission volumn within 2005, occupies the world
First place, although the target that China the Eleventh Five-Year Plan period cuts down sulfur dioxide 10% has been carried out, the current Acid Rain Pollution face of China
Long-pending（Account for the 30% of area）Still expand continuous.Every year because of acid rain and SO2Pollution causes crops, forest and health
Etc. aspect economic loss more than 100,000,000,000 yuan, sulfur dioxide (SO2) emissions control still can not be ignored.Dust refers to that particle diameter 1～75 is micro-
The particulate matter of rice.Typically produced by broken in commercial production, runs.According to analysis, China is every year by industry and life cellar for storing things
Fire grate enters the dust of air, more than 10,000,000 tons.Dust is easily inhaled into human respiratory tract's system, directly threatens the life of people
Life, the environment being especially in dust pollution can cause multiple cardiovascular, respiratory tract disease etc..
The species that desulfurizing agent is pressed in flue gas desulfurization divides, and can be divided into following five kinds of methods：With CaCO3（Limestone）Based on
Calcium method, the magnesium processes based on MgO, with Na2SO3Based on sodium method, with NH3Based on ammonia process, based on organic base
Organic alkaline process.Presently, it is recognized that desulfurization dust-removing technique include water film type, fountain, impact type and water-bath type etc..Venturi and rapids
Punching, as strengthening gas-liquid mass transfer (contact) equipment, is widely used in flue-gas dust-removing and desulfurization device, and wherein venturi height about 16m～
19m, and when exhaust gas volumn than larger when, whole desulfurizer is that form encircled by multiple venturi and desulfurizing tower, takes up room and throws
Money all ratios are larger, such as the flue gas desulfurization technique of Norton.Rapid punching needs for liquid phase to raise 6～8m, to produce froth zone, and leads to
Cross the continuous renewal of foam, keep efficient gas-liquid mass transfer effect, but the height of reactor and infrastructure investment also therefore increase
Greatly.
Patent US3894563A all combines realization using venturi with cyclone separator with patent US2012000366A1 and removes
Dirt and gas-liquid separation.The desulfurization dress of patent CN200920247553.1, CN200920200026.5 and CN03142049.4 introduction
Put or technique in, rapids rushes scrubbing tower and is and is separately provided, and floor space is big, and investment cost is high.
The technique that patent US4110088 describes a kind of high-temperature flue gas chilling cooling, dedusting and removing water soluble contaminants
And device.927～1038 DEG C of high-temperature flue gas, after two-stage spraying cooling, enter cyclone separator and isolate drop and dust,
Carry out removing pollutant in waste gas through packed tower again, after purification gas enter the deflection plate demister demisting with fin plate, finally
It is injected into aiutage through venturi, when purification gas spray at a high speed through venturi, produce negative pressure, empty around suction venturi
Gas, makes purification gas humidity reduce.This technological process is long, and pressure drop is very big, is provided with blower fan twice in technique, in order to for cigarette
Air stripping supplies power, and energy consumption is larger.
CN101301574A discloses a kind of multi-stage flue gas desulfurization spray column, including primary desulfurizing scrubber and secondary desulfurization
Spray column, the described outlet of primary desulfurizing scrubber is connected with the entrance of secondary desulfuration spray tower.This multi-stage flue gas take off
Sulfur tower also includes return duct, and this connecting tube is connected between the bottom of primary desulfurizing scrubber and secondary desulfuration spray tower, by
This, absorbing liquid is back to secondary desulfuration spray tower through this return duct, is equivalent to one circulatory pool of two-step desulfurization units shared.This skill
What art was realized has the technical effect that once desulfurization in primary desulfurizing scrubber, secondary desulfuration in secondary desulfuration spray tower, this skill
One circulatory pool of art two-step desulfurization units shared, the level not forming absorbing liquid joins region, and desulfurization degree is not high, and this technology is inhaled
Receive agent and adopt lime stone slurry, the return duct between two-step desulfurization unit only leans on gravity reflux, therefore reflux pipeline is easy to block,
This technology long-term operation reliability is not enough.
CN2608111Y discloses a kind of high-concentration fume desulfurating dust-removing equipment, and this technology is more than 2 sets of desulfurization unit
It is cascaded, with a shell, the desulfurization unit of series connection is covered on together, bottom shares a circulating slot, this technology circulatory pool
More than two sets of desulfurization unit, to process, is only cascaded by the feature not being directed to high-concentration fume, desulfuration efficiency energy
Enough guarantees, but take up an area larger, be not suitable for reserving the use of less region in place.
In prior art, though the cooling/dedusting/desulfurization of high-temperature flue gas adopts two-stage or multi-stage gas-liquid to contact absorption technique,
Reach pollutant removing effect, but every one-level spray-absorption is provided with corresponding equipment for liquid transportation and absorbing liquid atomization sets
Standby, energy consumption is higher.
Content of the invention
For the deficiency of existing Venturi scrubber and turbulent impulse scrubber fume treatment technology, the invention provides a kind of cigarette
Gas dedusting and desulfurizing tower, the high potential energy using spindle structured packing assembly and turbulent impulse scrubber absorbing liquid is carried out to flue gas simultaneously
Pretreatment, wherein spindle structured packing assembly are located at the top of turbulent impulse scrubber.Gas phase is sprayed by one-level spray system first
After cooling, again also cross spindle structured packing assembly, strong mass transfer reaction and dedusting cooling in here to gas-liquid two-phase there is.
Turbulent impulse scrubber absorbing liquid, during spray, because of the wind-force dissection by flue gas, is dispersed into tiny drop/droplet,
It is achieved thereby that the mass transfer of spray strengthening again absorbs.
The invention provides a kind of flue-gas dust-removing and desulfurization tower it is characterised in that described desulfurizing tower include pretreatment unit and
Advanced treatment unit, the two constitutes " H " type or " u "-shaped Double-Tower Structure, and wherein said pretreatment unit includes cigarette from top to bottom
Gas entrance, one-level spray system, spindle structured packing assembly, turbulent impulse scrubber and one-level hold liquid bath, described advanced treating
Unit includes two grades from bottom to top and holds liquid bath, filler assembly, demister and purifying smoke outlet, pretreatment unit and advanced treating
The exhaust gases passes connection by middle part for the unit.
According to the flue-gas dust-removing and desulfurization tower of the present invention, wherein said pretreatment unit also includes primary cycle pump I, one-level
Circulating pump II and primary cycle pipeline；Equally, described advanced treatment unit also include secondary cycle pump, secondary cycle pipeline and
Two grades of spray systems.Two grades of described spray systems are located above or below filler assembly.
According to the flue-gas dust-removing and desulfurization tower of the present invention, wherein in described pretreatment unit, in the tower wall of desulfurizing tower
Portion, preferably tower wall arrange moisture film assembly with the connecting portion of smoke inlet reducing.Described moisture film assembly can be using in this area
The structure of any suitable form, such as can arrange endless tube in tower wall surrounding, endless tube arranges the nozzle towards tower wall.And at this
In bright, preferably the connecting portion in tower wall and smoke inlet reducing arranges overflow-type moisture film assembly.Described overflow-type moisture film assembly
Structure be：One section of straight tube of lower end connection of smoke inlet reducing, the tower diameter with diameter greater than pretreatment unit of this direct tube section,
Tower wall forms the uncovered cannelure in bottom lock, a upper end with the connecting portion of reducing, preferably in the uncovered employing tooth of cannelure
Shape structure.This cannelure is held liquid bath with one-level and is connected by pipeline.When liquid constantly injects in cannelure, liquid can be with overflow
Form flows down from the uncovered continuous inwall along desulfurizing tower of cannelure, from top to bottom, thus covering whole wall of reactor.Due to
Reactor inlet does/wet interface, and heat smoke first time touches shower water, can produce the acid mist of high concentration, so dry/wet
The corrosion condition at interface is extremely serious, in the form of being protected using moisture film, it is possible to reduce the corrosion condition at dry/wet interface, and
And the fouling that will be attached on reactor wall rinses at any time, it is to avoid underdeposit corrosion, improve the antiseptic power of material
Or reduce the consumption of high-grade anti-corrosion material, thus significantly reducing cost.
According to the flue-gas dust-removing and desulfurization tower of the present invention, if described spindle structured packing assembly I include at least two-layer by
The packing layer that dry doubling connection, horizontal positioned spindle special pipe is constituted, some in parallel, spindle of horizontal positioned described in every layer
Shape special pipe constitutes multiple parallel channels with collection section, aditus laryngis and dispersion section.Wherein adjacent two-layer spindle abnormity
Pipe staggered interval setting up and down, the parallel channels that is, special pipe of lower floor's filler is formed with upper strata filler align.The present invention's
Spindle structured packing assembly can be made into one or is divided into some pieces of block combiner to use.
According to the flue-gas dust-removing and desulfurization tower of the present invention, wherein, described turbulent impulse scrubber rushes nozzle and pipeline institute structure by rapids
Become, all using the conventional structure in this area.
In the flue-gas dust-removing and desulfurization tower of the present invention, the section of described spindle special pipe（I.e. end face）For spindle, its
Top and bottom is circular arc, and middle part is also circular arc, connects middle part with top, middle part and bottom for just putting taper type and falling
Put taper type, and the radius of its top arc is greater than the radius of bottom circular arc, form the spindle of " the big following of top is little ".
The top of spindle special pipe is arc surface, is beneficial to the dust containing in gas under hygrometric state, in self gravitation and gas phase
Brushing under, by the downward landing of this slip flow regime, thus avoid occur channel blockage phenomenon.
In the flue-gas dust-removing and desulfurization tower of the present invention, preferably on the both sides tube wall of spindle special pipe bottom, open up groove,
Described groove has certain inclination angle.The groove that special pipe both sides tube wall opens up, can be symmetrical, symmetrical groove
Lower end can connect it is also possible to not connect.And the upper end starting point of groove is preferably lower than the circular arc pipe of downside tube wall and both sides
The phase tangent line of wall.The groove that spindle special pipe bottom both sides tube wall opens up, after wall flow liquid drip goes out aditus laryngis, under gas phase is blown
Drop is blown entrance groove, and realizes coalescence in groove, such that it is able to eliminate entrainment, realizes gas-liquid separation.
In the flue-gas dust-removing and desulfurization tower of the present invention, described spindle special pipe structured packing is by some special pipes in parallel
Define the passage with collection section, aditus laryngis and dispersion section.When high-temperature gas, liquid and dust cocurrent enter this packing area,
Initially enter collection section（Aisle spare shrinks）, gas velocity increases, and realizes solution dispersion, and liquid phase specific surface area increases,
Grit attachment is moistening, and scattered atomic drop, under the contention effect of high-speed gas, due to the ductility of water, will attach to tube wall
Upper formation liquid film is it is achieved that the coalescence of drop and samming process.When liquid film passes through aditus laryngis, due to the increasing further of gas velocity
Plus, and liquid film is created with strong compressing and dissection, liquid film is thinning further, creates twice dispersing effect；In warp
After crossing aditus laryngis, gas velocity declines rapidly, in the process, a large amount of dust containing in gas due to the change of gas velocity,
Realize mud and drip coalescence, dust will be along interface landing, thus realizing dedusting function, and liquid film is under the both sides of spindle special pipe
On the tube wall in portion during flow down, and clamp-oned in groove by gas it is achieved that coalescence again, and finally become continuous wire by spindle
Shape abnormity bottom of the tube drippage, thus eliminating entrainment, completes mass transfer reaction.
In the flue-gas dust-removing and desulfurization tower of the present invention, used in advanced treatment unit filler assembly typically select rectangular saddle ring,
The random packings such as Pall ring, Raschig ring or structured packing.Spindle structured packing is preferably employed, its structure and spindle in the present invention
Shape structured packing modular construction is identical, and it is not both the structured packing that this filler assembly adopts one layer of spindle special pipe to constitute.
In the flue-gas dust-removing and desulfurization tower of the present invention, two grades of described spray systems are located above or below filler assembly,
Flue gas and spray liquid counter current contacting mass transfer, spray liquid, under flue gas blows upwards, will produce certain altitude above filler assembly
Turbulence froth bed, at this moment not only contact surface is big for gas-liquid two-phase, and contact surface alkali liquor is continuously available renewal, gas-liquid two-phase
Fierce collisional mixing, reaches efficient mass transfer reaction it is achieved that deep desulfuration.Liquid phase falls into two grades in the presence of self gravitation
Hold in liquid bath.
In the flue-gas dust-removing and desulfurization tower of the present invention, described demister can such as adopt broken line type using conventional demister
Or streamlined demister.In the present invention, described demister preferably employs inverted cone deflector type demister.Wherein said back taper
Shape deflector type demister includes several demisting device assemblies arranged side by side, and each demisting assembly all includes riser and inversed conical drum,
Cone cylinder is arranged on the outside of riser, and with riser on the same axis；Riser is fixed on tower tray, the top of riser
Setting capping plate, has some seams in the circumference of riser, near each bar seam riser provided circumferentially about have tangentially lead
The stream wing.
In the flue-gas dust-removing and desulfurization tower of the present invention, the inner surface of described inversed conical drum can also have some parallel grooves.
Described groove is parallel with the bus of inversed conical drum, or can form an angle with bus.The section of described groove can be square
Shape, triangle or circular arc, preferred triangle in the present invention.Wherein, the lower ending opening of described inversed conical drum can also be arranged to saw
Tooth-shape structure, thus advantageously become continuous stream to drip in the liquid isolated from the inwall of inversed conical drum.
In the flue-gas dust-removing and desulfurization tower of the present invention, described inverted cone deflector type demister, by fluid in flow process
In multiple baffling realize drop and separate with gas.
In the flue-gas dust-removing and desulfurization tower of the present invention, can also hold in the one-level of pretreatment unit and in liquid bath, place floating basket,
Place oxidation catalyst in floating basket, such as can be dissolved the iron ore being converted into the manganese ion with catalysiss or iron ion.
Another technical problem to be solved by this invention is to provide a kind of process for dusting and dsulfurizing fume, the method uses
Flue-gas dust-removing and desulfurization tower recited above.
A kind of process for dusting and dsulfurizing fume of the present invention, specifically includes herein below：
（1）High-temperature flue gas, after the cooling of one-level spray system chilling, continue cocurrent with absorbing liquid and flow downward, enter and spin
Capitate structured packing assembly, and here carries out cooling, dedusting and the pre- desulfurization to absorption flue gas；
（2）Step（1）The pH value that flue gas after first order absorption is sprayed with turbulent impulse scrubber is that neutral or acid one-level is inhaled
Receive liquid counter current contacting, rapids rushes absorbing liquid during declining, and is dispersed into tiny by the wind-force dissection of gas in tower
Drop/droplet, proceed cooling, dedusting and pre- desulfurization in this process；
（3）The first order absorption liquid entrance one-level absorbing sulfur dioxide holds liquid bath, and is followed by primary cycle pump I, one-level
Ring pump II and primary cycle pipeline recycle；And the flue gas after pretreatment unit absorbs enters advanced treating by exhaust gases passes
Unit；
（4）Flue gas, under the promotion of upper pressure, is entered by the passage between pretreatment unit and advanced treatment unit
Advanced treatment unit, and upwardly through filler assembly, and with filler assembly above the pH value of spray system injection be in the two of alkalescence
Level absorbing liquid is fully contacted mass transfer in filler assembly, completes final sweetening process；
（5）After the purification of filler assembly, flue gas passes through demisting assembly, after gas-liquid separation, from dust-removal and desulfurizing reactor cigarette
Gas outlet is discharged.
In the process for dusting and dsulfurizing fume of the present invention, it is respectively provided with pretreatment unit and advanced treatment unit and holds liquid bath,
Define independent Two-way Cycle flue-gas dust-removing and desulfurization system.Hold liquid bath middle setting passage for two, it is pretreatment that one-level holds liquid bath
Unit provides absorbing liquid, and holding liquid bath for two grades provides absorbing liquid for advanced treatment unit.This technique proposes desulfurization absorbing liquid concentration
Level joins theory, and original absorbance liquid initially enters two grades and holds liquid bath, holds liquid bath entering one-level by center-aisle, one-level holds liquid bath
Discharge pond for final absorbing liquid, for guaranteeing the utilization rate of absorbing liquid, control two grades of entrance to hold liquid by the pH value that one-level holds liquid bath
The alkali liquor amount of groove.Because this technological process is able to ensure that two grades are held the pH value that liquid bath remains higher, the basicity of two grades of absorbing liquids is relatively
Height can greatly improve desulfurization degree.One-level holds liquid bath, the zonal control of two grades of pH value holding liquid bath, both ensure that this flue gas desulfurization
The high efficiency of method, may insure the higher utilization rate of desulfurization absorbing liquid again.
In the process for dusting and dsulfurizing fume of the present invention, flue gas can be from the sulfur-bearing dust-laden high temperature cigarette in various devices
The SO of gas, wherein flue gas2Concentration is 500～5000mg/Nm3, preferably 1000～4000mg/Nm3；Dust concentration 100～700mg/
Nm3, preferably 200～500mg/Nm3.
In the process for dusting and dsulfurizing fume of the present invention, the operating condition of described flue-gas dust-removing and desulfurization tower is：Operation temperature
For 100～350 DEG C, preferably 150～200 DEG C；Operating pressure is normal pressure to 1MPa；Treatment quantity is 500～250000m3/ h,
Preferably 700～200000m3/h；Absorbing liquid circulating load is 0.4m3/ h～7m3/ h, preferably 0.5m3/ h～6m3/h.
In the process for dusting and dsulfurizing fume of the present invention, described absorbing liquid can be NaOH solution, Na2CO3Solution, Mg
(OH)2Solution or lime water Ca (OH)2, the absorbing liquid that this technique preferably employs is NaOH solution, and wherein one-level holds in liquid bath one
The pH value of level absorbing liquid, between 6～7, is held for described two grades and is obtained two grades of absorbing liquid pH value in liquid bath between 8～10.
The present invention can also hold in the one-level of pretreatment unit and place floating basket in liquid bath, place iron ore in floating basket, due to
It is in faintly acid that one-level holds absorbing liquid in liquid bath, and iron ore can be dissolved and be converted into the manganese ion with catalysiss or iron ion.
Containing manganese ion or iron ion first order absorption liquid, one-level spray system is delivered to by primary cycle pump I, its spray liquid is inverse with flue gas
Stream contact, obtains oxygen and is transferred in liquid phase in flue gas.SO in first order absorption liquid and flue gas2Reaction generates sulphite or Asia
Disulfate, afterwards in dissolved oxygen with there is manganese ion or the iron ion action of catalysiss, oxidized be converted into sulfate,
Thus reducing the COD in waste water, make discharged wastewater met the national standard.
Compared with prior art, the flue-gas dust-removing and desulfurization tower of the present invention and its dust-collecting sulfur-removing method have the advantage that：
1st, high-temperature flue gas, after the cooling of one-level spray system chilling, continue cocurrent with absorbing liquid and flow downward, enter and spin
Capitate structured packing assembly, and here carries out cooling, dedusting and the pre- desulfurization to absorption flue gas；The cooling of flue gas chilling and dedusting take off
Sulphuring treatment effect is greatly strengthened.And rush after absorbing liquid contacts again with rapids by the flue gas after structured packing, absorbing liquid
It is dispersed into tiny drop/droplet by the wind-force dissection of gas, the effect of mass transmitting between gas-liquid two-phase is entered
One step strengthening.
2nd, the flue-gas dust-removing and desulfurization tower of the present invention, using moisture film assembly it is achieved that protecting to the moisture film of pretreatment unit tower wall
Shield, decreases the equipment corrosion of pretreatment unit, improves the antiseptic power of material or reduce high-grade anti-corrosion material
Consumption, thus significantly reduce construction costs.
3rd, the process for dusting and dsulfurizing fume of the present invention is it is proposed that desulfurization absorbing liquid concentration level joins theory.By in pretreatment
Unit and advanced treatment unit are respectively provided with and hold liquid bath, define independent Two-way Cycle flue-gas dust-removing and desulfurization system.Held by one-level
The pH value of liquid bath controls two grades of entrance to hold the fresh soda liquid measures of liquid bath, so that it is guaranteed that two grades of pH value holding liquid bath maintain higher alkali
Degree, thus substantially increase desulfurization degree.One-level holds liquid bath, the zonal control of two grades of pH value holding liquid bath, both ensure that this flue gas
The high efficiency of sulfur method, may insure the higher utilization rate of desulfurization absorbing liquid again.
Brief description
Fig. 1 is a kind of structural representation of present invention flue-gas dust-removing and desulfurization tower.
In Fig. 1：1- moisture film assembly；2- one-level spray system；3- spindle structured packing assembly；4- primary cycle pipeline；
5- primary cycle pump I；6- one-level holds liquid bath；Bis- grades of 7- holds liquid bath；8- passage；9- secondary cycle pump；10- secondary cycle pipeline；
11- filler assembly；Bis- grades of spray systems of 12-；13- demister；14- purifying smoke exports；15- smoke inlet；16- outer tube（Directly
Cylinder）；17- base plate；18- cylinder；19- turbulent impulse scrubber；20- primary cycle pump II；21- reducing；Edge on 22- cylinder.
Fig. 2 is the structural representation of the spindle structured packing assembly of the present invention.
In Fig. 2：31- pull bar；32- spindle special pipe；33- housing；34- flange, 35- collection section；36- aditus laryngis；37- divides
Scattered section；18- cylinder.
Fig. 3 is the structure chart of spindle special pipe.
In figure, 321- groove.
Fig. 4 is the structural representation of the inverted cone deflector type demister of demisting device assembly of the present invention.
In Fig. 4：131- tower tray；132- riser；133- inversed conical drum；The 134- tangential flow guiding wing；135- covers plate；136- bar
Seam；137- groove.
Specific embodiment
Further illustrate technology contents and the effect of the present invention with reference to the accompanying drawings and examples.
As shown in figure 1, the flue-gas dust-removing and desulfurization tower of the present invention includes pretreatment unit and advanced treatment unit, the two composition
" H " type or " U " type Double-Tower Structure, wherein said pretreatment unit includes smoke inlet 15, moisture film assembly from top to bottom successively
1st, one-level spray system 2, spindle structured packing assembly 3, turbulent impulse scrubber 19 and one-level hold liquid bath 6, described advanced treating
Unit includes two grades from bottom to top successively and holds liquid bath 7, filler assembly 11, demister 13 and purifying smoke outlet 14, pretreatment list
Unit is connected by the exhaust gases passes 8 at middle part with advanced treatment unit.
The flue-gas dust-removing and desulfurization tower of the present invention, wherein said pretreatment unit also includes primary cycle pump I 5, one-level is followed
Ring pump II 20 and primary cycle pipeline 4；Described advanced treatment unit also includes secondary cycle pump 9, secondary cycle pipeline 10 and
Two grades of spray systems 12.One-level spray system 2 is located at the top of spindle structured packing assembly, can select normal in this area
Rule sprinkling equipment.Two grades of spray systems 12 are located at the top of filler assembly 11, and certain two grades of spray systems 12 can also be located at and fill out
The lower section of material assembly 11.
In the flue-gas dust-removing and desulfurization tower of the present invention, described moisture film assembly 1 can be using any suitable form in this area
Structure.As shown in figure 1, a kind of moisture film assembly 1 of suitable configurations include smoke inlet reducing 21 lower end connection direct tube section 16,
Along 22 on the cylinder 18 of base plate 17 and pretreatment unit, define a ring by direct tube section 16, base plate 17 and cylinder along 22
Shape groove, and by primary cycle pipeline 4, primary cycle pump 5 with one-level hold liquid bath 6 be connected.Wherein direct tube section 16 with diameter greater than
The diameter of cylinder 18.Along 22, preferably there is tooth-shape structure on its middle cylinder body.
The flue-gas dust-removing and desulfurization tower of the present invention, described turbulent impulse scrubber can be selected for any form of rapids and rushes nozzle.As Fig. 2
Shown, the flue-gas dust-removing and desulfurization tower of the present invention, described spindle structured packing assembly is by the spinning of some horizontal positioned in parallel
Capitate special pipe 32, spindle special pipe 32 are connected by pull bar 31, and are fixed on housing 33.Setting on cylinder 18 inwall
Support flange 34, for installing fixing spindle structured packing.Define a plurality of flat between some parallel spindle special pipes 32
Row of channels, constitutes gas liquid two-phase flow passage, and described passage includes collection section 35, aditus laryngis 36 and dispersion section 37.
As shown in figure 3, the periphery of spindle special pipe（Especially bottom both sides tube wall）On have groove 321.
As shown in figure 4, the demister of the flue-gas dust-removing and desulfurization tower of the present invention, back taper tubular deflector type demisting can be selected
Device.Back taper tubular deflector type demister includes riser 132 and inversed conical drum 133, and inversed conical drum 133 is arranged on the outer of riser 132
Side, and with riser 132 on the same axis；Riser 132 is fixed on tower tray 131, the top setting capping plate of riser
135, have some seams 136 in the circumference of riser, have the tangential flow guiding wing the riser stitching near each bar is provided circumferentially about
134.Inner surface in inversed conical drum 133（Inwall）On be further opened with groove 137.
During work, high-temperature flue gas by smoke inlet 15, initially enter pretreatment unit, one-level holds liquid after over-quenching cooling
Primary cycle liquid in groove 6 is conveyed to moisture film assembly 1 by primary cycle pump I 5 part, desulfurizing tower is formed with liquid film protection, separately
A part is transported to one-level spray system 2, the first order absorption liquid counter current contacting that high-temperature flue gas are sprayed, reality with one-level spray system 2
Now preliminary chilling cooling.Flue gas after cooling flows downward with by scattered first order absorption liquid continuation cocurrent, enters spindle
Structured packing assembly 3, and here completes cooling, dedusting and the pre- desulfurization to absorption flue gas further；Flue gas continues to flow downward,
The first order absorption liquid counter current contacting spraying with turbulent impulse scrubber 19, the first order absorption liquid that turbulent impulse scrubber 19 sprays is by primary cycle
Pump II 20 conveys, and rapids rushes absorbing liquid during declining, and is dispersed into tiny by the wind-force dissection of gas in tower
Drop/droplet, proceeds cooling, dedusting and pre- desulfurization in this process.
The first order absorption liquid absorbing sulfur dioxide falls into one-level and holds liquid bath 6, and passes through primary cycle pump I 5, primary cycle
Pump II 20 and primary cycle pipeline 4 recycle；And the flue gas after pretreatment unit absorption, under the promotion of upper pressure, passes through
Passage 8 between pretreatment unit and advanced treatment unit enters advanced treatment unit.Flue gas after first order absorption upwardly through
Filler assembly 11, and fully connect in filler assembly 11 with two grades of absorbing liquids of two grades of spray system injections of filler assembly 11 top
Tactile mass transfer, two grades of absorbing liquids absorbing sulfur dioxide fall into two grades and hold liquid bath 7, and pass through secondary cycle pump 9 and secondary cycle
Pipeline 10 recycles, and completes final sweetening process.After the purification of filler assembly 11, flue gas passes through demister 13, gas-liquid
After separating, discharge from dust-removal and desulfurizing reactor exhanst gas outlet 14.
Embodiment 1
180 DEG C of certain high-temperature flue-gas, tolerance 180000Nm3/ h, SO2Concentration is 800mg/Nm3, dust concentration 200mg/
Nm3
Reactor operating condition：150 DEG C of operation temperature, operating pressure normal pressure, first order absorption liquid pH value is 6～7, two grades of suctions
Receiving liquid pH value is 8～9.Rapids rushes liquid-gas ratio 6：1, with NaOH solution as absorbent, gas-liquid counter current contacts；Filler assembly operates liquid gas
Ratio 3：1.
After processed by the invention, 60 DEG C of flue-gas temperature, desulfuration efficiency 98%, efficiency of dust collection 98%.
Claims (23)
1. a kind of flue-gas dust-removing and desulfurization tower is it is characterised in that described desulfurizing tower includes pretreatment unit and advanced treatment unit, and two
Person constitutes " H " type or " u "-shaped Double-Tower Structure, and wherein said pretreatment unit includes smoke inlet, one-level spray from top to bottom
System, spindle structured packing assembly, turbulent impulse scrubber and one-level hold liquid bath, and described advanced treatment unit includes from bottom to top
Hold liquid bath, filler assembly, demisting device assembly and purifying smoke outlet for two grades, pretreatment unit and advanced treatment unit pass through middle part
Exhaust gases passes connection；Wherein, described spindle structured packing assembly includes at least two-layer by some parallel connections, horizontal positioned
The packing layer that constitutes of spindle special pipe, some in parallel, spindle special pipes of horizontal positioned constitute multiple has collection
The parallel channels of section, aditus laryngis and dispersion section.
2. according to the dedusting and desulfurizing tower described in claim 1 it is characterised in that the section of described spindle special pipe is spindle
Shape, its top and bottom are circular arc, and middle part is also circular arc, and the radius of its top arc is greater than the half of bottom circular arc
Footpath.
3. according to the dedusting and desulfurizing tower described in claim 1 or 2 it is characterised in that in described spindle special pipe bottom
Groove is opened up on the tube wall of both sides, described groove has certain inclination angle.
4. according to the dedusting and desulfurizing tower described in claim 1 it is characterised in that in described pretreatment unit, in desulfurizing tower
Tower wall top arranges moisture film assembly.
5. according to the dedusting and desulfurizing tower described in claim 4 it is characterised in that becoming with smoke inlet on the tower wall top of desulfurizing tower
The connecting portion setting moisture film assembly in footpath.
6., according to the dedusting and desulfurizing tower described in claim 4 or 5 it is characterised in that arranging endless tube in tower wall surrounding, endless tube sets
Put the nozzle towards tower wall.
7. according to the dedusting and desulfurizing tower described in claim 5 it is characterised in that described moisture film assembly is overflow-type moisture film group
Part, the structure of overflow-type moisture film assembly is：The lower end of smoke inlet reducing connects one section of straight tube, this direct tube section with diameter greater than pre-
The tower diameter of processing unit, forms the uncovered cannelure in bottom lock, a upper end in tower wall and reducing connecting portion, and this cannelure is same
One-level is held liquid bath and is connected by pipeline.
8. according to the dedusting and desulfurizing tower described in claim 7 it is characterised in that the uncovered employing profile of tooth of described cannelure is tied
Structure.
9. according to the dedusting and desulfurizing tower described in claim 1 it is characterised in that the filler assembly in described advanced treatment unit selects
Use structured packing assembly.
10. according to the dedusting and desulfurizing tower described in claim 9 it is characterised in that described filler assembly adopts one layer of spindle
Structured packing.
11. according to the dedusting and desulfurizing tower described in claim 1 it is characterised in that described pretreatment unit also includes one-level follows
Ring pump I, primary cycle pump II and primary cycle pipeline；Equally, described advanced treatment unit also include secondary cycle pump, two grades
Circulation line and two grades of spray systems.
12. according to the dedusting and desulfurizing tower described in claim 1 it is characterised in that adjacent two-layer spindle special pipe is handed over up and down
Wrong interval is misplaced, and the parallel channels that is, special pipe of lower floor's filler is formed with upper strata filler align.
13. according to the dedusting and desulfurizing tower described in claim 1 it is characterised in that described demister adopt inverted cone deflector type
Demister；Inverted cone deflector type demister includes several demisting device assemblies arranged side by side, and each demisting assembly all includes riser
And inversed conical drum, inversed conical drum is arranged on the outside of riser, and with riser on the same axis；Riser is fixed on tower tray,
The top setting capping plate of riser, has some seams in the circumference of riser, on the riser circumference that each bar stitches
It is provided with the tangential flow guiding wing.
14. put it is characterised in that holding in liquid bath in the one-level of pretreatment unit according to the dedusting and desulfurizing tower described in claim 1
Put floating basket, in floating basket, place oxidation catalyst.
A kind of 15. process for dusting and dsulfurizing fume are it is characterised in that the method use the arbitrary described cigarette of claim 1 to 14
Gas dedusting and desulfurizing tower.
16. according to the process for dusting and dsulfurizing fume described in claim 15 it is characterised in that methods described includes herein below：
（1）High-temperature flue gas enter pretreatment unit, after the cooling of one-level spray system chilling, downward with absorbing liquid continuation cocurrent
Flowing, enters spindle structured packing assembly, and here is carried out to cooling, dedusting and the pre- desulfurization absorbing flue gas；
（2）Step（1）The pH value that flue gas after first order absorption is sprayed with turbulent impulse scrubber is neutral or acid first order absorption liquid
Counter current contacting, proceeds cooling, dedusting and pre- desulfurization；
（3）The first order absorption liquid entrance one-level absorbing sulfur dioxide holds liquid bath, and passes through primary cycle pump I, primary cycle pump
II and primary cycle pipeline recycle；
（4）And the flue gas after pretreatment unit absorbs enters advanced treatment unit by exhaust gases passes, upwardly through filler assembly,
And it is fully contacted mass transfer in two grades of absorbing liquids of alkalescence in filler assembly with the pH value of two grades of spray system injections, complete final
Sweetening process；
（5）After the purification of filler assembly, flue gas passes through demisting assembly, after gas-liquid separation, goes out from dust-removal and desulfurizing reactor flue gas
Mouth is discharged.
17. according to the process for dusting and dsulfurizing fume described in claim 16 it is characterised in that the SO of described flue gas2Concentration is
500～5000mg/Nm3, dust concentration 100～700mg/Nm3.
18. according to the process for dusting and dsulfurizing fume described in claim 16 it is characterised in that described flue-gas dust-removing and desulfurization tower
Operating condition is：Operation temperature is 100～350 DEG C, and operating pressure is normal pressure to 1MPa, and treatment quantity is 500～1500m3/
H, absorbing liquid circulating load is 0.4m3/ h～7m3/h.
19. according to the process for dusting and dsulfurizing fume described in claim 16 it is characterised in that described absorbing liquid be NaOH molten
Liquid, Na2CO3Solution, Mg (OH)2Solution or lime water Ca (OH)2.
20. according to the process for dusting and dsulfurizing fume described in claim 16 it is characterised in that the pH value of described first order absorption liquid
Between 6～7, the pH value of described two grades of absorbing liquids is between 8～10.
21. according to the process for dusting and dsulfurizing fume described in claim 17 it is characterised in that the SO of described flue gas2Concentration 1000
～4000mg/Nm3, dust concentration is 200～500mg/Nm3.
22. according to the process for dusting and dsulfurizing fume described in claim 18 it is characterised in that described flue-gas dust-removing and desulfurization tower
Operating condition is：Operation temperature is 150～200 DEG C, and treatment quantity is 700～1200m3/ h, absorbing liquid circulating load is 0.5m3/
H～6m3/h.
23. according to the process for dusting and dsulfurizing fume described in claim 19 it is characterised in that described absorbing liquid be NaOH molten
Liquid.
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| CN105688558B (en) * | 2016-03-04 | 2017-10-27 | 上海安赐环保科技股份有限公司 | One kind realizes Desulphurization for Coal-fired Power Plant tail gas minimum discharge falling liquid film water wash system and its technique |
| CN106215660A (en) * | 2016-08-25 | 2016-12-14 | 灵宝金源晨光有色矿冶有限公司 | SO in a kind of recovery tail gas2system |
| CN107051060A (en) * | 2016-12-23 | 2017-08-18 | 江苏和亿昌环保工程科技有限公司 | A kind of desulfurizing tower wet dust separater and method |
| CN113101707B (en) * | 2021-04-21 | 2022-06-28 | 东北石油大学 | Multi-stage hydraulic self-pulse backwashing mechanism, fine filter and backwashing method |
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| EP0092614A1 (en) * | 1982-04-22 | 1983-11-02 | Procon International Inc. | Vapour-liquid contacting apparatus |
| US6146597A (en) * | 1997-03-14 | 2000-11-14 | Petroleum Energy Center | Separation device |
| CN102380306A (en) * | 2011-10-18 | 2012-03-21 | 中钢集团天澄环保科技股份有限公司 | Flue gas desulfurization tower adopting sodium-alkaline method |
| CN102794103A (en) * | 2012-09-04 | 2012-11-28 | 中电投远达环保工程有限公司 | Double circulation U-shaped tower desulfurization system and process |
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| EP0092614A1 (en) * | 1982-04-22 | 1983-11-02 | Procon International Inc. | Vapour-liquid contacting apparatus |
| US6146597A (en) * | 1997-03-14 | 2000-11-14 | Petroleum Energy Center | Separation device |
| CN102380306A (en) * | 2011-10-18 | 2012-03-21 | 中钢集团天澄环保科技股份有限公司 | Flue gas desulfurization tower adopting sodium-alkaline method |
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