CN104607017B - A kind of H type flue-gas dust-removing and desulfurization tower and flue gas desulfurization technique - Google Patents
A kind of H type flue-gas dust-removing and desulfurization tower and flue gas desulfurization technique Download PDFInfo
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- CN104607017B CN104607017B CN201310540346.6A CN201310540346A CN104607017B CN 104607017 B CN104607017 B CN 104607017B CN 201310540346 A CN201310540346 A CN 201310540346A CN 104607017 B CN104607017 B CN 104607017B
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- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 75
- 230000023556 desulfurization Effects 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 41
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- 239000000428 dust Substances 0.000 claims description 16
- 238000001816 cooling Methods 0.000 claims description 15
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- WAEMQWOKJMHJLA-UHFFFAOYSA-N Manganese(2+) Chemical compound [Mn+2] WAEMQWOKJMHJLA-UHFFFAOYSA-N 0.000 description 3
- 239000002585 base Substances 0.000 description 3
- -1 iron ion Chemical class 0.000 description 3
- 229910001437 manganese ion Inorganic materials 0.000 description 3
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- 238000006276 transfer reaction Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
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- 239000003513 alkali Substances 0.000 description 2
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- 241000242759 Actiniaria Species 0.000 description 1
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- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 208000018569 Respiratory Tract disease Diseases 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical group [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
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- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical compound [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 description 1
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- Treating Waste Gases (AREA)
Abstract
The invention discloses a kind of H type flue-gas dust-removing and desulfurization tower and flue gas desulfurization technique.The desulfurizing tower of the present invention includes pretreatment unit and advanced treatment unit, and the two constitutes " H " shape Double-Tower Structure；Described pretreatment unit includes that smoke inlet, moisture film assembly, one-level spray system, date core shaped structured packing assembly, turbulent impulse scrubber and one-level hold liquid bath from top to bottom, and described advanced treatment unit includes that two grades are held liquid bath, filler assembly, demister and purifying smoke outlet from bottom to top；Pretreatment unit is connected by the exhaust gases passes at middle part with advanced treatment unit.The desulfurizing tower of the present invention can utilize the high potential energy of date core shaped structured packing assembly and turbulent impulse scrubber absorbing liquid flue gas to be carried out pretreatment simultaneously, there is pollutants removal rate height and low power consumption and other advantages, be particularly well-suited to the dust-removal and desulfurizing process of the higher flue gas of dustiness.
Description
Technical field
The invention discloses a kind of H type flue-gas dust-removing and desulfurization tower and flue gas desulfurization technique, belong to field of environment protection, it is adaptable to flue gas and process tail gas dust-removal and desulfurizing process, and can be widely applied to the field such as petrochemical industry and environmental protection.
Background technology
In the atmospheric pollution of China, acid rain and floating dust are topmost pollutions.During the last ten years, owing to the discharge capacity of sulfur dioxide and nitrogen oxides day by day increases, the problem of acid rain is more and more prominent.China has been the third-largest Acid Rain Zone being only second to Europe and North America now.SO2It is the major reason causing China's atmospheric pollution with dust, the atmosphere pollution of the current priority control of Ye Shi China.China SO2Total emission volumn is the most for years more than 20,000,000 tons, within 2005, total emission volumn reaches 25,490,000 tons, occupying first place in the world, although the target that China the Eleventh Five-Year Plan period cuts down sulfur dioxide 10% has been carried out, but the Acid Rain Pollution area that China is current (accounting for the 30% of area) is still constantly expanding.Annual because of acid rain and SO2Polluting and cause the economic loss of the aspects such as crops, forest and health more than 100,000,000,000 yuan, sulfur dioxide (SO2) emissions control still to can not be ignored.Dust refers to particle diameter 1～the particulate matter of 75 microns.Typically produced by broken in commercial production, runs.According to analysis, China is entered the dust of air every year by industry and life cellar for storing things fire grate, more than 10,000,000 tons.Dust is easily inhaled into human respiratory tract's system, directly threatens the life of people, and the environment being especially in dust pollution can cause multiple cardiovascular, respiratory tract disease etc..
Flue gas desulfurization is pressed the kind of desulfurizing agent and is divided, and can be divided into following five kinds of methods: with CaCO3Calcium method based on (limestone), the magnesium processes based on MgO, with Na2SO3Based on sodium method, with NH3Based on ammonia process, the organic alkaline process based on organic base.Presently, it is recognized that desulfurization dust-removing technique include water film type, fountain, impact type and water-bath type etc..Venturi and rapid punching are as strengthening gas-liquid mass transfer (contact) equipment, flue-gas dust-removing and desulfurization device is widely used, wherein venturi height about 16m～19m, and when exhaust gas volumn is bigger, whole desulfurizer is that multiple venturi encircles form with desulfurizing tower, take up room and invest the biggest, such as the flue gas desulfurization technique of Norton.Rapid punching needs liquid phase is raised 6～8m, to produce froth zone, and by the continuous renewal of foam, keeps efficient gas-liquid mass transfer effect, but the most therefore the height of reactor and infrastructure investment substantially increase.
Patent US3894563A and patent US2012000366A1 all use venturi to realize dedusting and gas-liquid separation with cyclone separator combination.In desulfurizer that patent CN200920247553.1, CN200920200026.5 and CN03142049.4 introduce or technique, rapids rushes scrubbing tower and is and is separately provided, and floor space is big, and investment cost is high.
Patent US4110088 describes the cooling of a kind of high-temperature flue gas chilling, dedusting and the technique of removing water soluble contaminants and device.The high-temperature flue gas of 927～1038 DEG C is 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 the deflection plate demister of purification gas entrance band fin plate is except mist, finally being injected into aiutage through venturi, purification gas, when venturi ejection at a high speed, produces negative pressure, suction venturi surrounding air, makes purification gas humidity reduce.This technological process is long, and pressure drop is very big, is provided with twice blower fan in technique, and with thinking that flue gas provides power, energy consumption is bigger.
CN101301574A discloses a kind of multi-stage flue gas desulfurization spray column, and including primary desulfurizing scrubber and secondary desulfuration spray tower, the outlet of described primary desulfurizing scrubber is connected with the entrance of secondary desulfuration spray tower.This multi-stage flue gas desulfurization tower also includes return duct, this connecting tube is connected between the bottom of primary desulfurizing scrubber and secondary desulfuration spray tower, thus, 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.What this technology realized has the technical effect that once desulfurization in primary desulfurizing scrubber, secondary desulfuration in secondary desulfuration spray tower, this one circulatory pool of technology two-step desulfurization units shared, it is formed without the grating region of absorbing liquid, desulfurization degree is the highest, and this absorption of technology agent uses lime stone slurry, and the return duct between two-step desulfurization unit is only by gravity reflux, therefore reflux pipeline is easy to blocking, this Chief Technology Officer period run reliability is not enough.
CN2608111Y discloses a kind of high-concentration fume desulfurating dust-removing equipment, this technology is overlapped above desulfurization unit 2 and is cascaded, with a shell, the desulfurization unit of series connection is covered on together, bottom shares a circulating slot, this technology circulatory pool does not has to process for the feature of high-concentration fume, is only cascaded by the two above desulfurization units of set, and desulfuration efficiency ensure that, but take up an area relatively big, be not suitable for the reserved less region in place and use.
In prior art, though the cooling/dedusting of high-temperature flue gas/desulfurization uses two-stage or multi-stage gas-liquid contact absorption technique, having reached pollutant removing effect, but every one-level spray-absorption is provided with corresponding equipment for liquid transportation and absorbing liquid atomization plant, energy consumption is higher.
Summary of the invention
For existing Venturi scrubber and the deficiency of turbulent impulse scrubber fume treatment technology, the invention provides a kind of H type flue-gas dust-removing and desulfurization tower and flue gas desulfurization technique, the high potential energy utilizing date core shaped structured packing assembly and turbulent impulse scrubber absorbing liquid carries out pretreatment to flue gas simultaneously, and wherein date core shaped structured packing assembly is positioned at the top of turbulent impulse scrubber.Gas phase is first by after one-level spray system spraying cooling, and gas-liquid two-phase, again also cross date core shaped structured packing assembly, occurs strong mass transfer reaction and dedusting cooling at this.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 H type flue-gas dust-removing and desulfurization tower, it is characterized in that, described desulfurizing tower includes pretreatment unit and advanced treatment unit, the two constitutes " H " type Double-Tower Structure, wherein said pretreatment unit includes that smoke inlet, one-level spray system, date core shaped structured packing assembly, turbulent impulse scrubber and one-level hold liquid bath from top to bottom, described advanced treatment unit includes that two grades are held liquid bath, filler assembly, demister and purifying smoke outlet from bottom to top, and pretreatment unit is connected by the exhaust gases passes at middle part with advanced treatment unit.
H type flue-gas dust-removing and desulfurization tower according to the present invention, wherein said pretreatment unit also includes primary cycle pump I, primary cycle pump II and primary cycle pipeline；Equally, described advanced treatment unit also includes secondary cycle pump, secondary cycle pipeline.Described one-level spray system is positioned at the top of date core shaped structured packing assembly；Two grades of described spray systems are positioned at above or below filler assembly.
H type flue-gas dust-removing and desulfurization tower according to the present invention, wherein in described pretreatment unit, on the top of desulfurizing tower tower wall, preferably desulfurizing tower tower wall arranges moisture film assembly with the connecting portion of smoke inlet reducing.Described moisture film assembly can use any suitable version in this area, as arranged endless tube in tower wall surrounding, endless tube arranges the nozzle towards tower wall.And in the present invention, it is preferred to overflow-type moisture film assembly is set at the connecting portion of tower wall Yu smoke inlet reducing.The structure of overflow-type moisture film assembly is: the lower end of smoke inlet reducing connects one section of straight tube, and the diameter of this direct tube section more than the tower diameter of pretreatment unit, forms, at tower wall and the connecting portion of reducing, the cannelure that a bottom lock, upper end are uncovered.Preferably at the uncovered employing tooth-shape structure of cannelure.This cannelure is held liquid bath with one-level and is connected by pipeline, primary cycle pump.When liquid constantly injects in cannelure, liquid constantly can flow down along the inwall of desulfurizing tower from the upper edge of tower wall with overflow type, from top to bottom, thus covers whole wall of reactor.Due to the dry/wet interface at reactor inlet; heat smoke touches shower water for the first time; the acid mist of high concentration can be produced; so the corrosion condition at dry/wet interface is extremely serious, by using the form of moisture film protection, the corrosion condition at dry/wet interface can be greatly decreased; and the fouling that will be attached on reactor wall rinses at any time; avoid underdeposit corrosion, improve the antiseptic power of material or reduce the consumption of high-grade anticorrosion material, thus significantly reducing cost.
H type flue-gas dust-removing and desulfurization tower according to the present invention, described date core shaped structured packing, including date core shaped structured packing, it includes the packing layer that more than at least one of which, preferred two-layer are made up of some parallel connections, horizontal positioned date core shaped special pipe, and every layer of described some parallel connection, the date core shaped special pipe of horizontal positioned constitute multiple has collection section, aditus laryngis and the parallel channels of dispersion section.Date core shaped structured packing can be made into one or is divided into some pieces of block combiner to use.
In the H type flue-gas dust-removing and desulfurization tower of the present invention, the cross section (i.e. end face) of described date core shaped special pipe is date core shaped, and its top and bottom are acute triangle, and middle part is circular arc, forms the date core shaped of " Rhizoma Anemones Raddeanae middle circle ".The middle part of date core shaped special pipe is arc surface, and the dust being beneficial to contain in gas is under hygrometric state, under the brushing of self gravitation and gas phase, by the downward landing of this slip flow regime, thus avoids channel blockage phenomenon.
Two end faces of described date core shaped special pipe can be closed or do not close.
In the H type flue-gas dust-removing and desulfurization tower of the present invention, preferably offering groove on the both sides tube wall of date core shaped special pipe bottom, described groove preferably has certain inclination angle.The groove that special pipe both sides tube wall is offered, can be symmetrical, and the lower end of symmetrical groove can connect, it is also possible to does not connects.
The groove that both sides, date core shaped special pipe bottom tube wall is offered, after beneficially wall flow liquid drip goes out aditus laryngis, blows lower drop in gas phase and is blown entrance groove, and realize coalescence in groove, such that it is able to eliminate entrainment, it is simple to realize gas-liquid separation.
The lower edge of date core shaped special pipe can also be arranged to zigzag structure, is beneficial to after wall flow liquid drip goes out special pipe, form equally distributed continuous stream.
In the H type flue-gas dust-removing and desulfurization tower of the present invention, described date core shaped special pipe structured packing is defined by some special pipes in parallel has collection section, aditus laryngis and the passage of dispersion section.When high-temperature gas, liquid and dust and flow entrance this packing area time, initially enter collection section (aisle spare contraction), gas velocity increases, realizing solution dispersion, liquid phase specific surface area increases, and grit attachment is moistening, scattered atomic drop is under the contention effect of high-speed gas, due to the ductility of water, will attach to be formed on tube wall liquid film, it is achieved that the coalescence of drop and samming process.When liquid film is by aditus laryngis, due to the further increase of gas velocity, liquid film creating again strong compressing and dissection, liquid film is the most thinning, creates twice dispersing effect；After aditus laryngis, gas velocity declines rapidly, in the process, the a large amount of dust contained in gas are due to the change of gas velocity, realizing mud and drip coalescence, dust along interface landing, thus will realize dedusting function, and liquid film is on the tube wall of two side lower parts of date core shaped special pipe during flow down, clamp-oned further in groove by gas again, it is achieved that coalescence again, and finally become continuous wire to be dripped by the bottom of date core shaped special pipe, thus eliminate entrainment, complete mass transfer reaction.
The H type flue-gas dust-removing and desulfurization tower of the present invention is particularly well-suited to the operating mode that dust content in flue gas is bigger.
In the H type flue-gas dust-removing and desulfurization tower of the present invention, random packing or the structured packing assemblies such as rectangular saddle ring, Pall ring, Raschig ring are typically selected in the packing area of advanced treatment unit.Present invention preferably employs is date core shaped structured packing, and its structure is identical with the structure of the date core shaped structured packing assembly of pretreatment unit, and it is not both this filler assembly preferably only with one layer of date core shaped structured packing.
In the H type flue-gas dust-removing and desulfurization tower of the present invention, two grades of described spray systems are positioned at above or below filler assembly.Flue gas and spray liquid cocurrent or countercurrent contact mass transfer.Spray liquid is under flue gas upwards blows, the froth bed of the turbulence of certain altitude will be produced above date core shaped structured packing assembly, at this moment gas-liquid two-phase not only contact surface is big, and contact surface alkali liquor is continuously available renewal, gas-liquid two-phase fierceness collisional mixing, reach efficient mass transfer reaction, it is achieved mass transport process, carry out deep desulfuration reaction.Liquid phase falls into two grades in the effect of self gravitation and holds in liquid bath.
In the H type flue-gas dust-removing and desulfurization tower of the present invention, described demister can use the demister of routine, as used broken line type or streamlined except mist assembly.In the present invention, described demister preferred deflector type demister.Deflector type demister includes that one or several are arranged side by side except mist assembly, each all includes riser and urceolus except mist assembly, and urceolus is arranged on the outside of riser, and with riser on the same axis；Riser is fixed on tower tray, and the top of riser arranges capping plate, and the circumference at riser has some seams, provided circumferentially about has the tangential flow guiding wing at the riser near each bar seam.
Wherein said urceolus is made up of direct tube section and conical cylinder section.The inner surface (inwall) of urceolus can also arrange projection, and described projection preferably employs the clapper structure that cross section is rectangle.Wherein, the direction of rotation of hyoplastron is preferably contrary with the direction of rotation of the tangential flow guiding wing.In the present invention, the lower ending opening of described urceolus can also be arranged to zigzag structure, thus advantageously becomes continuous drip to fall in isolated liquid from the inwall of urceolus.
In the H type flue-gas dust-removing and desulfurization tower of the present invention, described deflector type demister, realize drop by the fluid repeatedly baffling in flow process and separate with gas.
The present invention can also place floating basket in the one-level of pretreatment unit holds liquid bath, places oxidation catalyst such as iron ore in floating basket.Holding absorbing liquid in liquid bath due to one-level is faintly acid, and iron ore can be dissolved and be converted into manganese ion or the iron ion with catalysis.Being delivered to one-level spray system containing manganese ion or iron ion first order absorption liquid by primary cycle pump I, its spray liquid contacts with flue gas adverse current, obtains oxygen and be transferred in liquid phase in flue gas.First order absorption liquid and the SO in flue gas2Reaction generates sulphite or bisulfites, afterwards dissolved oxygen and there is catalysis manganese ion or iron ion action under, the oxidized sulfate that is converted into, thus reduce the COD in waste water, make discharged wastewater met the national standard.
Another technical problem to be solved by this invention is to provide a kind of dusting and desulfurizing technology for smoke, and this technique employs flue-gas dust-removing and desulfurization tower recited above.
A kind of dusting and desulfurizing technology for smoke of the present invention, specifically includes herein below:
(1) high-temperature flue gas is after one-level spray system chilling is lowered the temperature, and continues with absorbing liquid and stream flows downward, and enters date core shaped structured packing assembly, and carries out at this absorbing the cooling of flue gas, dedusting and pre-desulfurization；
(2) flue gas after step (1) first order absorption is neutral or acid first order absorption liquid counter current contacting with the pH value of turbulent impulse scrubber ejection, rapids rushes absorbing liquid during declining, it is dispersed into tiny drop/droplet by the wind-force dissection of gas in tower, proceeds 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 recycled by primary cycle pump I, primary cycle pump II and primary cycle pipeline；
(4) under the promotion of upper pressure, flue gas after pretreatment unit absorption is by entering advanced treatment unit by the passage between pretreatment unit and advanced treatment unit, and upwardly through filler assembly, and it is fully contacted mass transfer with the pH value of two grades of spray systems injection two grades of absorbing liquids in alkalescence at filler assembly, complete final sweetening process；
(5) by flue gas after the purification of filler assembly by except mist assembly, after gas-liquid separation, discharge from dust-removal and desulfurizing reactor exhanst gas outlet.
In the dusting and desulfurizing technology for smoke of the present invention, it is respectively provided with at pretreatment unit and advanced treatment unit and holds liquid bath, define independent Two-way Cycle flue-gas dust-removing and desulfurization system.Holding for two and arrange passage in the middle of liquid bath, one-level is held liquid bath and is provided absorbing liquid for pretreatment unit, holds liquid bath for two grades and provides absorbing liquid for advanced treatment unit.This technique proposes desulfurization absorbing liquid concentration grating theory, original absorbance liquid initially enters two grades and holds liquid bath, enter one-level by center-aisle again and hold liquid bath, it is final absorbing liquid discharge pond that one-level holds liquid bath, for guaranteeing the utilization rate of absorbing liquid, one-level the pH value holding liquid bath controls to enter two grades of alkali liquor amounts holding liquid bath.Owing to 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 higher can be greatly improved desulfurization degree.One-level holds liquid bath and two grades of zonal control holding liquid bath pH value, both ensure that the high efficiency of this fume desulphurization method, and may insure that again the utilization rate that desulfurization absorbing liquid is higher.
In the dusting and desulfurizing technology for smoke of the present invention, flue gas can be from the sulfur-bearing dust-laden high-temperature flue gas in various devices, the wherein SO of flue gas2Concentration is 500～5000mg/Nm3, preferably 1000～4000mg/Nm3；Dust concentration 200～800mg/Nm3, preferably 300～600mg/Nm3。
In the dusting and desulfurizing technology for smoke of the present invention, the operating condition of described flue-gas dust-removing and desulfurization tower is: operation temperature is 100～350 DEG C, preferably 150～200 DEG C；Operation pressure is normal pressure to 1MPa；Treatment quantity is 500～200000m3/ h, preferably 700～190000 m3/h；Absorbing liquid circulating load is 0.4m3/ h～7m3/ h, preferably 0.5m3/ h～6m3/h。
The dusting and desulfurizing technology for smoke of the present invention, described absorbing liquid can be NaOH solution, Na2CO3Solution, Mg (OH)2Solution or lime water Ca (OH)2, the preferred NaOH solution of absorbing liquid of this technique employing, the pH value of the first order absorption liquid during wherein one-level holds liquid bath is between 6～7, and described two grades are held and obtained two grades of absorbing liquid pH value in liquid bath between 8～10.
Compared with prior art, H type flue-gas dust-removing and desulfurization tower and the dusting and desulfurizing technology for smoke of the present invention has the advantage that
1, high-temperature flue gas is after one-level spray system chilling is lowered the temperature, and continues with absorbing liquid and stream flows downward, and enters date core shaped structured packing assembly, and carries out at this absorbing the cooling of flue gas, dedusting and pre-desulfurization；The cooling of flue gas chilling and dust-removal and desulfurizing treatment effect are strengthened greatly.And again rush after absorbing liquid contacts with rapids by the flue gas after structured packing, absorbing liquid is dispersed into tiny drop/droplet by the wind-force dissection of gas, and the effect of mass transmitting between gas-liquid two-phase is further strengthened.
2, the H type flue-gas dust-removing and desulfurization reactor of the present invention; use moisture film assembly, it is achieved that the moisture film of pretreatment unit tower wall is protected, decreases the equipment corrosion of pretreatment unit; improve the antiseptic power of material or reduce the consumption of high-grade anticorrosion material, thus significantly reducing construction costs.
3, the dusting and desulfurizing technology for smoke of the present invention, it is proposed that desulfurization absorbing liquid concentration grating theory.Hold liquid bath by being respectively provided with at pretreatment unit and advanced treatment unit, define independent Two-way Cycle flue-gas dust-removing and desulfurization system.The pH value being held liquid bath by one-level controls to enter two grades of fresh soda liquid measures holding liquid bath, so that it is guaranteed that two grades of pH value holding liquid bath maintain higher basicity, thus substantially increases desulfurization degree.One-level holds liquid bath and the zonal control of two grades of pH value holding liquid bath, both ensure that the high efficiency of this fume desulphurization method, and may insure that again the utilization rate that desulfurization absorbing liquid is higher.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention a kind of H type flue-gas dust-removing and desulfurization tower.
In Fig. 1: 1-moisture film assembly；2-one-level spray system；3-date core shaped structured packing assembly；4-primary cycle pipeline；5-primary cycle pump I；6-one-level holds liquid bath；7-bis-grades 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-urceolus；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 date core shaped structured packing assembly of the present invention.
In Fig. 2: 31-pull bar；32-date core shaped special pipe；33-housing；34-flange, 35-collection section；36-aditus laryngis；37-disperses section；18-cylinder.
Fig. 3 is the structural representation of date core shaped special pipe.
In Fig. 3,321-groove.
Fig. 4 is the structural representation of inverted cone deflector type demister in 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 stitches；137-hyoplastron；138-direct tube section；139-conical cylinder section.
Detailed description of the invention
Technology contents and the effect of the present invention is further illustrated below in conjunction with the accompanying drawings with embodiment.
As it is shown in figure 1, the H type flue-gas dust-removing and desulfurization tower of the present invention includes pretreatment unit and advanced treatment unit, the two constitutes " H " type Double-Tower Structure.Wherein said pretreatment unit includes that smoke inlet 15, moisture film assembly 1, one-level spray system 2, date core shaped structured packing assembly 3, turbulent impulse scrubber 19 and one-level hold liquid bath 6 the most successively, described advanced treatment unit includes that two grades are held liquid bath 7, filler assembly 11, demister 13 and purifying smoke outlet 14 the most successively, and pretreatment unit is connected by the exhaust gases passes 8 at middle part with advanced treatment unit.
The H type flue-gas dust-removing and desulfurization tower of the present invention, wherein said pretreatment unit also includes primary cycle pump I 5, primary cycle 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.Described one-level spray system 2 is positioned at the top of date core shaped structured packing assembly.Two grades of spray systems 12 are positioned at the top of filler assembly 11, and certain two grades of spray systems 12 can also be positioned at the lower section of filler assembly 11.
The H type flue-gas dust-removing and desulfurization tower of the present invention, described moisture film assembly 1 can use any suitable version in this area.As in FIG, moisture film assembly 1 includes that smoke inlet becomes in 21(figure should labelling) cylinder 18 of direct tube section 16, base plate 17 and pretreatment unit that connects of lower end on along 22, defined a cannelure by direct tube section 16, base plate 17 and cylinder along 22, and hold liquid bath 6 by primary cycle pipeline 4, primary cycle pump 5 with one-level and be connected.Wherein the diameter of direct tube section 16 is more than the diameter of cylinder 18.Tooth bathtub construction is preferably employed along 22 on its middle cylinder body.
The H type flue-gas dust-removing and desulfurization tower of the present invention, described turbulent impulse scrubber 19 can be selected for any form of rapids and rushes nozzle.As in figure 2 it is shown, the flue-gas dust-removing and desulfurization tower of the present invention, described date core shaped structured packing assembly is connected by pull bar 31 by the date core shaped special pipe 32 of some horizontal positioned in parallel, date core shaped special pipe 32, and is fixed on housing 33.On cylinder 18 inwall, support lugn 34 is set, is used for fixing date core shaped structured packing is installed.Defining a plurality of parallel channels between some parallel date core shaped special pipes 32, constitute gas liquid two-phase flow passage, described passage includes collection section 35, aditus laryngis 36 and dispersion section 37.As shown in Figure 4, both sides, date core shaped special pipe bottom tube wall is opened can have some parallel grooves 321.
As shown in Figure 4, the H type flue-gas dust-removing and desulfurization tower of the present invention, each described demister includes riser 132 and urceolus 133, and urceolus 133 is arranged on the outside of riser 132, and with riser 132 on the same axis, urceolus is made up of direct tube section 138 and conical cylinder section 139；Riser 132 is fixed on tower tray 131, and the top of riser arranges capping plate 135, and the circumference at riser has some seams 136, provided circumferentially about has the tangential flow guiding wing 134 at the riser near each bar seam.The inner surface (inwall) of inversed conical drum 133 is further opened with hyoplastron 137.
During work; high-temperature flue gas through over-quenching lower the temperature after by smoke inlet 15; initially enter pretreatment unit; the primary cycle liquid that one-level is held in liquid bath 6 is flowed to moisture film assembly 1 by primary cycle pump I 5 part; reactor is formed liquid film protection; another part is transported to one-level spray system 2, the first order absorption liquid counter current contacting that high-temperature flue gas sprays with one-level spray system 2, it is achieved preliminary chilling cooling.Flue gas after cooling flows downward with by the continuation of scattered first order absorption liquid stream, enters date core shaped structured packing assembly 3, and completes further at this absorbing the cooling of flue gas, dedusting and pre-desulfurization；Flue gas continues to flow downward, first order absorption liquid counter current contacting with turbulent impulse scrubber 19 ejection, the first order absorption liquid of turbulent impulse scrubber 19 ejection is carried by primary cycle pump II 20, rapids rushes absorbing liquid during declining, it is dispersed into tiny drop/droplet by the wind-force dissection of gas in tower, proceeds cooling, dedusting and pre-desulfurization in this process.
Absorb the first order absorption liquid of sulfur dioxide to fall into one-level and hold liquid bath 6, and recycled by primary cycle pump I 5, primary cycle pump II 20 and primary cycle pipeline 4；And the flue gas after pretreatment unit absorption is under the promotion of upper pressure, enter advanced treatment unit by the passage 8 between pretreatment unit and advanced treatment unit.Flue gas after first order absorption is upwardly through filler assembly 11, and it is fully contacted mass transfer with the two grades of absorbing liquids of two grades of spray systems injection above filler assembly 11 at filler assembly 11, absorb two grades of absorbing liquids of sulfur dioxide to fall into two grades and hold liquid bath 7, and recycled by secondary cycle pump 9 and secondary cycle pipeline 10, complete final sweetening process.By flue gas after the purification of filler assembly 11 by demister 13, after gas-liquid separation, discharge from dust-removal and desulfurizing reactor exhanst gas outlet 14.
Embodiment 1
Certain high-temperature flue-gas 180 DEG C, tolerance 160000Nm3/ h, SO2Concentration is 500mg/Nm3, dust concentration 300mg/Nm3。
Reactor operating condition: operation temperature 170 DEG C, operates pressure normal pressure, and first order absorption liquid pH value is 6～7, and two grades of absorbing liquid pH value are 8～9.Rapids rushes liquid-gas ratio 6:1, and with NaOH solution as absorbent, gas-liquid counter current contacts；Filler assembly operation liquid-gas ratio 3:1.
After the inventive method processes, flue-gas temperature 50 DEG C, desulfuration efficiency 98%, efficiency of dust collection 99%.
Claims (20)
1. a H type flue-gas dust-removing and desulfurization tower, it is characterized in that, described desulfurizing tower includes pretreatment unit and advanced treatment unit, the two constitutes " H " type Double-Tower Structure, wherein said pretreatment unit includes that smoke inlet, one-level spray system, date core shaped structured packing assembly, turbulent impulse scrubber and one-level hold liquid bath from top to bottom, described advanced treatment unit includes that two grades are held liquid bath, filler assembly, demister and purifying smoke outlet from bottom to top, and pretreatment unit is connected by the exhaust gases passes at middle part with advanced treatment unit；
Described date core shaped structured packing assembly includes the packing layer that at least two-layer is made up of some parallel connections, horizontal positioned date core shaped special pipe, and every layer of some parallel connection, the date core shaped special pipe of horizontal positioned constitute multiple has collection section, aditus laryngis and the parallel channels of dispersion section.
2., according to the dedusting and desulfurizing tower described in claim 1, it is characterised in that the cross section of described date core shaped special pipe is date core shaped, its top and bottom are acute triangle, and middle part is circular arc.
3. according to the dedusting and desulfurizing tower described in claim 1 or 2, it is characterised in that offer groove on the both sides tube wall of described date core shaped special pipe bottom.
4., according to the dedusting and desulfurizing tower described in claim 1, it is characterised in that in described pretreatment unit, moisture film assembly is set on the top of desulfurizing tower tower wall.
5. according to the dedusting and desulfurizing tower described in claim 4, it is characterised in that the connecting portion on desulfurizing tower Ta Bi top Yu smoke inlet reducing arranges moisture film assembly.
6. according to the dedusting and desulfurizing tower described in claim 4 or 5, it is characterised in that arrange endless tube in tower wall surrounding, endless tube arranges the nozzle towards tower wall.
7. according to the dedusting and desulfurizing tower described in claim 5, it is characterized in that, described moisture film assembly is overflow-type moisture film assembly, the structure of overflow-type moisture film assembly is: the lower end of smoke inlet reducing connects one section of straight tube, the diameter of this straight tube is more than the tower diameter of pretreatment unit, forming, at tower wall and reducing connecting portion, the cannelure that a bottom lock, upper end are uncovered, this cannelure is held liquid bath with one-level 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 tooth-shape structure of described cannelure.
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 structured packing assembly.
10. according to the dedusting and desulfurizing tower described in claim 9, it is characterised in that described structured packing assembly uses one layer of date core shaped structured packing.
11. according to the dedusting and desulfurizing tower described in claim 1, it is characterised in that described pretreatment unit also includes primary cycle pump I, primary cycle pump II and primary cycle pipeline；Equally, described advanced treatment unit also includes secondary cycle pump, secondary cycle pipeline 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 date core shaped special pipe staggered interval up and down is arranged, and the parallel channels that i.e. special pipe of lower floor's filler and upper strata filler are formed aligns.
13. according to the dedusting and desulfurizing tower described in claim 1, it is characterized in that, described demister is deflector type demister, described deflector type demister includes that one or several are arranged side by side except mist assembly, each all include riser and urceolus except mist assembly, urceolus is arranged on the outside of riser, and with riser on the same axis；Riser is fixed on tower tray, and the top of riser arranges capping plate, and the circumference at riser has some seams, provided circumferentially about has the tangential flow guiding wing at the riser near each bar seam；Urceolus is made up of direct tube section and conical cylinder section.
14. according to the dedusting and desulfurizing tower described in claim 1, it is characterised in that places floating basket in the one-level of pretreatment unit holds liquid bath, places oxidation catalyst in floating basket.
15. 1 kinds of dusting and desulfurizing technology for smoke, it is characterised in that this technique employs the arbitrary described H type flue-gas dust-removing and desulfurization tower of claim 1 to 14.
16. according to the dusting and desulfurizing technology for smoke described in claim 15, it is characterised in that described technique includes herein below:
(1) high-temperature flue gas enters pretreatment unit, after one-level spray system chilling is lowered the temperature, continues with absorbing liquid and stream flows downward, and enters date core shaped structured packing assembly, and carries out at this absorbing the cooling of flue gas, dedusting and pre-desulfurization；
(2) flue gas after step (1) first order absorption is neutral or acid first order absorption liquid counter current contacting with the pH value of turbulent impulse scrubber ejection, proceeds cooling, dedusting and pre-desulfurization；
(3) the first order absorption liquid entrance one-level absorbing sulfur dioxide holds liquid bath, and is recycled by primary cycle pump I, primary cycle pump II and primary cycle pipeline；
(4) and pretreatment unit absorb after flue gas enter advanced treatment unit by exhaust gases passes, upwardly through filler assembly, and it is fully contacted mass transfer with the pH value of two grades of spray systems injection two grades of absorbing liquids in alkalescence at filler assembly, complete final sweetening process；
(5) by flue gas after the purification of filler assembly by except mist assembly, after gas-liquid separation, discharge from dust-removal and desulfurizing reactor exhanst gas outlet.
17. according to the dusting and desulfurizing technology for smoke described in claim 16, it is characterised in that the SO of described flue gas2Concentration is 500～5000mg/Nm3, dust concentration is 200～800mg/Nm3。
18. according to the dusting and desulfurizing technology for smoke described in claim 16, it is characterised in that the operating condition of described flue-gas dust-removing and desulfurization tower is: operation temperature be 100～350 DEG C, operation pressure be normal pressure to 1MPa, treatment quantity is 500～200000m3/ h, absorbing liquid circulating load is 0.4m3/ h～7m3/h。
19. according to the dusting and desulfurizing technology for smoke described in claim 16, it is characterised in that described absorbing liquid is NaOH solution, Na2CO3Solution, Mg (OH)2Solution or lime water Ca (OH)2。
20. according to the dusting and desulfurizing technology for smoke described in claim 16, it is characterised in that the pH value of described first order absorption liquid is between 6～7, and the pH value of two grades of described absorbing liquids is between 8～10.
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| CN109289475A (en) * | 2018-10-12 | 2019-02-01 | 上海翰忠环保有限公司 | A kind of high effective flue gas fair current dust-removal and desulfurizing disappears white processing method and its device |
| CN111760422B (en) * | 2020-06-30 | 2022-09-06 | 双盾环境科技有限公司 | Variable-flow turbulent bubble type pre-absorption process for removing sulfur dioxide by flue gas organic amine method |
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