CN104607008A - Double-circulating flue gas dust removal desulfurization tower and flue gas desulfurization method - Google Patents
Double-circulating flue gas dust removal desulfurization tower and flue gas desulfurization method Download PDFInfo
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- CN104607008A CN104607008A CN201310540452.4A CN201310540452A CN104607008A CN 104607008 A CN104607008 A CN 104607008A CN 201310540452 A CN201310540452 A CN 201310540452A CN 104607008 A CN104607008 A CN 104607008A
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Abstract
The present invention discloses a double-circulating flue gas dust removal desulfurization tower and a desulfurization method. The desulfurization tower 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 waterdrop-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 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 desulfurization tower of the present invention, the waterdrop-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 low dust content flue gas.
Description
Technical field
The invention discloses a kind of Two-way Cycle flue-gas dust-removing and desulfurization tower and fume desulphurization method, belong to field of environment protection, be applicable to flue gas and the process of process tail gas dust-removal and desulfurizing, the field such as petrochemical industry and environmental protection can be widely used in.
Background technology
In the atmosphere pollution of China, acid rain and floating dust are topmost pollutions.During the last ten years, because the discharge capacity of sulfur dioxide and nitrogen oxide day by day increases, the problem of acid rain is more and more outstanding.Present China has been the third-largest Acid Rain Zone being only second to Europe and North America.SO
2the major reason causing China's atmosphere pollution with dust, the atmosphere pollution of the current priority control of Ye Shi China.China SO
2total emission volumn is for years more than 2,000 ten thousand tons, within 2005, total emission volumn reaches 2,549 ten thousand tons, occupy first place in the world, although the target that China the Eleventh Five-Year Plan period cuts down sulfur dioxide 10% realizes, the current Acid Rain Pollution area (accounting for 30% of area) of China is still in continuous expansion.Annual because of acid rain and SO
2polluting causes the economic loss of the aspects such as crops, forest and health more than 1,000 hundred million yuan, and sulfur dioxide (SO2) emissions control still to can not be ignored.Dust refers to the particle of particle diameter 1 ~ 75 micron.Generally produced by broken in industrial 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 1,000 ten thousand 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, breathing problem etc.
The kind that desulfurizing agent is pressed in flue gas desulfurization divides, and can be divided into following Lung biopsy: with CaCO
3calcium method based on (lime stone), the magnesium processes based on MgO, with Na
2sO
3based on sodium method, with NH
3based on ammonia process, the organic alkaline process based on organic base.At present, the desulfurization dust-removing technique of generally acknowledging comprises water film type, fountain, impact type and water-bath type etc.Venturi and rapid punching are as strengthening gas-liquid mass transfer (contact) equipment, be widely used in flue-gas dust-removing and desulfurization device, wherein venturi height is about 16m ~ 19m, and when exhaust gas volumn is larger, whole desulfurizer is that form encircled by multiple venturi and desulfurizing tower, take up room and invest all larger, as the flue gas desulfurization technique of Norton.Rapid punching needs liquid phase to raise 6 ~ 8m, to produce froth zone, and by the continuous renewal of foam, keep efficient gas-liquid mass transfer effect, but therefore the height of reactor and infrastructure investment also increases greatly.
Patent US3894563A and patent US2012000366A1 all adopts venturi and cyclone separator to combine and realizes dedusting and gas-liquid separation.In the desulfurizer that patent CN200920247553.1, CN200920200026.5 and CN03142049.4 introduce or technique, rapids rushes scrubbing tower and is independent setting, and floor space is large, and investment cost is high.
Patent US4110088 describes the cooling of a kind of high-temperature flue gas chilling, dedusting and removes technique and the device of water soluble contaminants.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 Purge gas enters the deflection plate demister demist of band fin plate, finally spray through venturi and enter aiutage, Purge gas, when venturi sprays at a high speed, produces negative pressure, suction venturi surrounding air, makes Purge gas humidity reduce.This technological process is long, and pressure drop is very large, and be provided with twice blower fan in technique, with thinking that flue gas provides power, energy consumption is larger.
CN101301574A discloses a kind of multi-stage flue gas desulfurization spray column, comprises elementary desulfurizing scrubber and secondary desulfuration spray tower, and the outlet of described elementary desulfurizing scrubber is connected with the entrance of secondary desulfuration spray tower.This multi-stage flue gas desulfurization tower also comprises return duct, this tube connector is connected between the bottom of elementary desulfurizing scrubber and secondary desulfuration spray tower, thus, absorbing liquid is back to secondary desulfuration spray tower through this return duct, is equivalent to two-step desulfurization units shared circulatory pool.The technique effect that this technology realizes is once desulfurization in elementary desulfurizing scrubber, secondary desulfuration in secondary desulfuration spray tower, this technology two-step desulfurization units shared circulatory pool, do not form the grating region of absorbing liquid, desulfurization degree is not high, and this absorption of technology agent adopts 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 cascaded the above desulfurization unit of 2 cover, with a shell, the desulfurization unit of series connection is covered on together, bottom shares a circulating slot, this technology circulatory pool does not process for the feature of high-concentration fume, and be only cascaded by the above desulfurization unit of two covers, desulfuration efficiency can ensure, but take up an area comparatively large, be not suitable for reserving less region in place and use.
In prior art, though the cooling/dedusting of high-temperature flue gas/desulfurization adopts two-stage or multi-stage gas-liquid contact absorption technique, reach pollutant removing effect, every one-level spray-absorption is provided with corresponding equipment for liquid transportation and absorbing liquid atomization plant, and energy consumption is higher.
Summary of the invention
For the deficiency of existing Venturi scrubber and turbulent impulse scrubber fume treatment technology, the invention provides a kind of Two-way Cycle flue-gas dust-removing and desulfurization tower, utilize the high potential energy of water-drop-shaped structured packing assembly and turbulent impulse scrubber absorbing liquid to carry out pretreatment to flue gas, wherein water-drop-shaped structured packing assembly is positioned at the top of turbulent impulse scrubber simultaneously.Gas phase is first by after one-level spray system spraying cooling, and gas-liquid two-phase, again simultaneously through water-drop-shaped structured packing assembly, at this, strong mass transfer reaction and dedusting cooling occurs.Turbulent impulse scrubber absorbing liquid, in spray process, because of the wind-force dissection by flue gas, is dispersed into tiny drop/droplet, thus achieves the absorption of the mass transfer of spray strengthening again, is specially adapted to the dust-removal and desulfurizing process of the lower flue gas of dustiness.
The invention provides a kind of Two-way Cycle flue-gas dust-removing and desulfurization tower, it is characterized in that, described desulfurizing tower comprises pretreatment unit and advanced treatment unit, the two forms " H " type or " U " shape Double-Tower Structure, wherein said pretreatment unit comprises smoke inlet, one-level spray system, water-drop-shaped structured packing assembly, turbulent impulse scrubber and one-level from top to bottom and holds liquid bath, described advanced treatment unit comprises secondary from bottom to top and holds the outlet of liquid bath, filler assembly, demister and purifying smoke, and pretreatment unit is communicated with the exhaust gases passes of advanced treatment unit by middle part.
According to Two-way Cycle flue-gas dust-removing and desulfurization tower of the present invention, wherein said pretreatment unit also comprises primary cycle pump I, primary cycle pump II and primary cycle pipeline; Equally, described advanced treatment unit also comprises secondary cycle pump, secondary cycle pipeline and secondary spray system.Described one-level spray system is positioned at the top of water-drop-shaped structured packing assembly, and holds liquid bath by primary cycle pipeline with primary cycle pump I and one-level and be connected; Turbulent impulse scrubber is held liquid bath with primary cycle pump II with one-level by primary cycle pipeline and is connected; Described secondary spray system is positioned at above or below filler assembly.
According to Two-way Cycle flue-gas dust-removing and desulfurization tower of the present invention, wherein in described pretreatment unit, on the top of desulfurizing tower tower wall, the connecting portion of preferred desulfurizing tower tower wall and smoke inlet reducing arranges moisture film assembly.Described moisture film assembly can adopt the structure of any suitable form in this area, and as arranged endless tube in upper column wall surrounding, on endless tube, installation surface is to the nozzle of tower wall.And in the present invention, preferably overflow-type moisture film assembly is set at the connecting portion of tower wall and 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, the diameter of this direct tube section is greater than the tower diameter of pretreatment unit, the uncovered cannelure in a bottom lock, upper end is formed, preferably at the uncovered employing tooth-shape structure of cannelure at the connecting portion of tower wall and reducing.This cannelure is held liquid bath with one-level and is connected by pipeline.When liquid constantly injects cannelure, liquid constantly can flow down along the inwall of desulfurizing tower with the upper edge of overflow type from tower wall, from top to bottom, thus covers whole wall of reactor.Owing to doing/wet interface at reactor inlet; heat smoke first time touches shower water; the acid mist of high concentration can be produced; so very serious at the corrosion condition at dry/wet interface, by adopting the form of moisture film protection, the corrosion condition at dry/wet interface significantly can be reduced; and the fouling be attached on reactor wall is rinsed 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.
According to Two-way Cycle flue-gas dust-removing and desulfurization tower of the present invention, described water-drop-shaped structured packing assembly comprise at least one deck, preferred two-layer above by some parallel connections, packing area that the water-drop-shaped special pipe of horizontal positioned is formed, the some parallel connections described in every layer, the water-drop-shaped special pipe of horizontal positioned constitute multiple parallel channels with collection section, aditus laryngis and dispersion section.Water-drop-shaped structured packing can be made into one or is divided into some pieces of block combiner to use.
In Two-way Cycle flue-gas dust-removing and desulfurization tower of the present invention, the cross section (i.e. end face) of described water-drop-shaped special pipe is water-drop-shaped, and its top is circular arc, and bottom is acute triangle, forms the water-drop-shaped of " the large following point of top ".The top of water-drop-shaped special pipe is arc surface, by the dust that is conducive to containing in gas 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 occurs.
In Two-way Cycle flue-gas dust-removing and desulfurization tower of the present invention, preferably have some parallel grooves in the tube wall bottom of water-drop-shaped special pipe.The cross section of groove can be triangle, rectangle or circular arc, preferred triangle.The groove that special pipe both sides tube wall is offered, can be symmetrical, and the lower end of symmetrical groove can be communicated with, and also can not be communicated with.Described some parallel groove, substantially increases the surface area of structured packing unit volume, namely substantially increases gas-liquid mass transfer area.
The groove that both sides, water-drop-shaped special pipe bottom tube wall is offered, after the wall flow liquid drip flowing through passage goes out aditus laryngis, blows lower drop in gas phase and is blown and enter groove, and realize coalescence in groove, thus can eliminate entrainment, realize gas-liquid separation.
In Two-way Cycle flue-gas dust-removing and desulfurization tower of the present invention, described water-drop-shaped special pipe structured packing is defined the passage with collection section, aditus laryngis and dispersion section by some special pipes of parallel connection.When high-temperature gas, liquid and dust and when flowing to into this packing area, first collection section (aisle spare contraction) is entered, gas velocity increases, realize solution dispersion, liquid phase specific surface area increases, and grit attachment is moistening, the atomic drop of dispersion is under the contention effect of high-speed gas, due to the ductility of water, will be attached on tube wall and form liquid film, achieve coalescence and the samming process of drop.When liquid film is by aditus laryngis, due to the further increase of gas velocity, create strong compressing and dissection again to liquid film, liquid film is thinning further, 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, realize mud and drip coalescence, dust along interface landing, thus will realize dedusting function, and liquid film on the tube wall of two side lower parts of water-drop-shaped special pipe toward current downflow time, clamp-oned in groove by gas again, achieve coalescence again, and the continuous wire of final one-tenth is dripped by the bottom of water-drop-shaped special pipe, thus eliminate entrainment, complete mass transfer reaction.
In Two-way Cycle flue-gas dust-removing and desulfurization tower of the present invention, the filler assembly used in advanced treatment unit generally selects random packing or the structured packings such as rectangular saddle ring, Pall ring, Raschig ring.Preferably adopt water-drop-shaped structured packing in the present invention, its structure is identical with the water-drop-shaped structured packing modular construction in pretreatment unit, and it is not both this filler assembly and adopts the structured packing of one deck water-drop-shaped.
In Two-way Cycle flue-gas dust-removing and desulfurization tower of the present invention, described secondary spray system is positioned at above or below filler assembly, flue gas and spray liquid adverse current or and flow contact mass transfer.Spray liquid, under flue gas upwards blows, will produce the froth bed of the turbulence of certain altitude above water-drop-shaped structured packing, and at this moment not only contact surface is large for gas-liquid two-phase, and contact surface alkali lye is constantly upgraded.The fierce collisional mixing of gas-liquid two-phase, reaches efficient mass transfer reaction, realizes deep desulfuration.Liquid phase falls into secondary in the effect of self gravitation and holds in liquid bath.
In Two-way Cycle flue-gas dust-removing and desulfurization tower of the present invention, described demister can adopt conventional demister, as adopted broken line type or streamlined demister.In the present invention, described demister preferred straight tube shape deflector type demister.Straight tube shape deflector type demister comprises several demist assemblies arranged side by side, and each demist assembly includes riser and straight tube, and straight tube 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, has some seams at the circumference of riser, the tangential flow guiding wing is circumferentially provided with at the riser near each bar seam, straight tube inwall is provided with some the grooves with axis being parallel, for the coalescence of liquid, realizes gas-liquid separation.
In straight tube shape deflector type demister, the inner surface of described straight tube can also arrange projection.Described projection and the axis being parallel of straight tube, or can form an angle with axis.The cross section of the projection of described setting can be the suitable shape such as rectangle, triangle or circle.Projection described in the present invention preferably adopts cross section to be the clapper structure of rectangle.Wherein, the direction of rotation of hyoplastron is contrary with the direction of rotation of the tangential flow guiding wing.
Wherein, the lower ending opening of described straight tube can also be arranged to zigzag structure, thus advantageously becomes Continuous Flow to drip in isolated liquid from the inwall of straight tube.
In Two-way Cycle flue-gas dust-removing and desulfurization tower of the present invention, described straight tube shape deflector type demister, realizes being separated of drop and gas by the repeatedly baffling of fluid in flow process.
The present invention can also hold in liquid bath in the one-level of pretreatment unit and place floating basket, places oxidation catalyst, as dissolved the iron ore of ion in an acidic solution in floating basket.
Another technical problem to be solved by this invention is to provide a kind of process for dusting and dsulfurizing fume, the method uses Two-way Cycle flue-gas dust-removing and desulfurization tower recited above.
A kind of process for dusting and dsulfurizing fume of the present invention, specifically comprises following content:
(1) high-temperature flue gas is after the cooling of one-level spray system chilling, continues and flows to current downflow, enter water-drop-shaped structured packing assembly with absorbing liquid, and carries out the cooling absorbing flue gas, dedusting and pre-desulfurization at this;
(2) pH value that the flue gas after step (1) first order absorption and turbulent impulse scrubber spray is neutral or acid first order absorption liquid counter current contacting, rapids rushes absorbing liquid in decline process, be subject to the wind-force dissection of gas in tower and be dispersed into tiny drop/droplet, proceeding cooling, dedusting and pre-desulfurization in this process;
(3) the first order absorption liquid absorbing sulfur dioxide enters one-level and 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 absorbs is by the passage penetration depth processing unit between pretreatment unit and advanced treatment unit, upwards pass through filler assembly, and with filler assembly above the secondary absorbing liquid of the spray system pH value of spraying in alkalescence in the abundant contact mass transfer of filler assembly, complete final sweetening process;
(5) pass through demist assembly by flue gas after the purification of filler assembly, after gas-liquid separation, discharge from dust-removal and desulfurizing reactor exhanst gas outlet.
In process for dusting and dsulfurizing fume of the present invention, arrange respectively at pretreatment unit and advanced treatment unit and hold liquid bath, define independently Two-way Cycle flue-gas dust-removing and desulfurization system.Hold in the middle of liquid bath for two and arrange passage, one-level holds liquid bath for pretreatment unit provides absorbing liquid, and secondary holds liquid bath for advanced treatment unit provides absorbing liquid.This technique proposes desulfurization absorbing liquid concentration grating theory, first original absorbance liquid enter secondary and hold liquid bath, hold liquid bath entering one-level by center-aisle, it is final absorbing liquid discharge pond that one-level holds liquid bath, for guaranteeing the utilization rate of absorbing liquid, the pH value of being held liquid bath by one-level controls to enter the alkali lye amount that secondary holds liquid bath.Because this technological process can guarantee that secondary holds the higher pH value of liquid bath maintenance, the basicity of secondary absorbing liquid is higher can improve desulfurization degree greatly.One-level holds the zonal control that liquid bath and secondary hold liquid bath pH value, both ensure that the high efficiency of this fume desulphurization method, and can guarantee again the utilization rate that desulfurization absorbing liquid is higher.
In process for dusting and dsulfurizing fume of the present invention, flue gas can be the sulfur-bearing dust-laden high-temperature flue gas coming from various device, the wherein SO of flue gas
2concentration is 500 ~ 5000mg/Nm
3, preferably 1000 ~ 4000mg/Nm
3; Dust concentration 70 ~ 300mg/Nm
3, preferably 100 ~ 200mg/Nm
3.
In process for dusting and dsulfurizing fume of the present invention, the operating condition of described flue-gas dust-removing and desulfurization tower is: operating temperature is 100 ~ 350 DEG C, preferably 150 ~ 200 DEG C; Operating pressure is that normal pressure is to 1MPa; Treatment quantity is 500 ~ 200000m
3/ h, preferably 700 ~ 180000m
3/ h; Absorbing liquid internal circulating load is 0.4m
3/ h ~ 7m
3/ h, preferred 0.5m
3/ h ~ 6m
3/ h.
In process for dusting and dsulfurizing fume of the present invention, described absorbing liquid can be NaOH solution, Na
2cO
3solution, Mg (OH)
2solution or limewash Ca (OH)
2, the preferred NaOH solution of the absorbing liquid in this method, wherein one-level holds the pH value of the first order absorption liquid in liquid bath between 6 ~ 7, and described secondary is held in liquid bath and obtained secondary absorbing liquid pH value between 8 ~ 10.
The present invention can also hold in liquid bath in the one-level of pretreatment unit and place floating basket, places oxidation catalyst, as dissolved the iron ore of ion in an acidic solution in floating basket.Holding absorbing liquid in liquid bath due to one-level is faintly acid, and iron ore can be converted into the manganese ion or iron ion with catalysis by dissolving.Be 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.SO in first order absorption liquid and flue gas
2reaction generates sulphite or bisulfites, afterwards under dissolved oxygen and the manganese ion with catalysis or iron ion action, is oxidizedly converted into sulfate, thus reduces the COD in waste water, make discharged wastewater met the national standard.
Compared with prior art, Two-way Cycle flue-gas dust-removing and desulfurization tower of the present invention and fume desulphurization method tool have the following advantages:
1, high-temperature flue gas is after the cooling of one-level spray system chilling, continues and flows to current downflow, enter water-drop-shaped structured packing assembly with absorbing liquid, and carries out the cooling absorbing flue gas, dedusting and pre-desulfurization at this; The cooling of flue gas chilling and dust-removal and desulfurizing treatment effect are strengthened greatly.And again rushing after absorbing liquid contacts with rapids by the flue gas after structured packing, absorbing liquid is subject to the wind-force dissection of gas and is dispersed into tiny drop/droplet, and the effect of mass transmitting between gas-liquid two-phase is further strengthened.
2, Two-way Cycle flue-gas dust-removing and desulfurization tower of the present invention; adopt moisture film assembly; achieve and the moisture film of pretreatment unit tower wall is protected; decrease 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, process for dusting and dsulfurizing fume of the present invention, proposes desulfurization absorbing liquid concentration grating theory.Holding liquid bath by arranging respectively at pretreatment unit and advanced treatment unit, defining independently Two-way Cycle flue-gas dust-removing and desulfurization system.The pH value of being held liquid bath by one-level controls to enter the fresh soda liquid measure that secondary holds liquid bath, thus guarantees that the pH value that secondary holds liquid bath maintains higher basicity, thus substantially increases desulfurization degree.One-level holds the zonal control that liquid bath and secondary hold liquid bath pH value, both ensure that the high efficiency of this fume desulphurization method, and can guarantee again the utilization rate that desulfurization absorbing liquid is higher.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of flue-gas dust-removing and desulfurization tower of the present invention.
In Fig. 1: 1-moisture film assembly; 2-one-level spray system; 3-water-drop-shaped structured packing assembly; 4-primary cycle pipeline; 5-primary cycle pump I; 6-one-level holds liquid bath; 7-secondary holds liquid bath; 8-passage; 9-secondary cycle pump; 10-secondary cycle pipeline; 11-filler assembly; 12-secondary spray system; 13-demister assembly; 14-purifying smoke exports; 15-smoke inlet; 16-urceolus; 17-base plate; 18-cylindrical shell; 19-turbulent impulse scrubber; 20-primary cycle pump II; 21-reducing; Edge on 22-cylindrical shell.
Fig. 2 is the structural representation of water-drop-shaped structured packing assembly of the present invention.
In Fig. 2: 31-pull bar; 32-water-drop-shaped special pipe; 33-housing; 34-flange, 35-collection section; 36-aditus laryngis; 37-disperses section; 18-cylindrical shell.
Fig. 3 is the structural representation of water-drop-shaped shape tube of the present invention.
In Fig. 3: 321-groove.
Fig. 4 is the structural representation of straight tube shape deflector type demister in the present invention.
In Fig. 4: 131-tower tray; 132-riser; 133-straight tube; The 134-tangential flow guiding wing; 135-capping plate; 136-bar stitches; 137-groove.
Detailed description of the invention
Technology contents of the present invention and effect is further illustrated below in conjunction with drawings and Examples.
As shown in Figure 1, Two-way Cycle flue-gas dust-removing and desulfurization tower of the present invention comprises pretreatment unit and advanced treatment unit, the two forms " H " type Double-Tower Structure, wherein said pretreatment unit comprises smoke inlet 15 from top to bottom successively, moisture film assembly 1, one-level spray system 2, water-drop-shaped structured packing assembly 3, turbulent impulse scrubber 19 and one-level hold liquid bath 6, described advanced treatment unit comprises secondary from bottom to top successively and holds liquid bath 7, filler assembly 11, demister 13 and purifying smoke outlet 14, pretreatment unit is communicated with the exhaust gases passes 8 of advanced treatment unit by middle part.
Two-way Cycle flue-gas dust-removing and desulfurization tower of the present invention, wherein said pretreatment unit also comprises primary cycle pump I 5, primary cycle pump II 20 and primary cycle pipeline 4; Described advanced treatment unit also comprises secondary cycle pump 9, secondary cycle pipeline 10 and secondary spray system 12.Described one-level spray system 2 is positioned at the top of water-drop-shaped structured packing assembly 3.Secondary spray system 12 is positioned at the top of filler assembly 11, and certain secondary spray system 12 also can be positioned at the below of filler assembly 11.
In Two-way Cycle flue-gas dust-removing and desulfurization tower of the present invention, described moisture film assembly 1 can adopt the structure of any suitable form in this area.In Fig. 1, moisture film assembly 1 comprise direct tube section 16 that smoke inlet reducing 21 lower end connects, base plate 17 and pretreatment unit cylindrical shell 18 on along 22, define a cannelure by direct tube section 16, base plate 17 and cylindrical shell 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 greater than the diameter of cylindrical shell 18.Wherein preferably on cylindrical shell along 22(and cannelure uncovered) preferably adopt tooth-shape structure.
Two-way Cycle flue-gas dust-removing and desulfurization tower of the present invention, described turbulent impulse scrubber can select the rapids of arbitrary form to rush nozzle.As shown in Figure 2, Two-way Cycle flue-gas dust-removing and desulfurization tower of the present invention, described water-drop-shaped structured packing assembly is connected by pull bar 31 by the water-drop-shaped special pipe 32 of some horizontal positioned in parallel, water-drop-shaped special pipe 32, and is fixed on housing 33.Cylindrical shell 18 inwall arranges support lugn 34, for installing fixing water-drop-shaped structured packing.Define many parallel channels between some parallel water-drop-shaped special pipes 32, constitute gas liquid two-phase flow passage, described passage comprises collection section 35, aditus laryngis 36 and dispersion section 37.
As shown in Figure 4, Two-way Cycle flue-gas dust-removing and desulfurization tower of the present invention, described straight tube shape deflector type demister comprises riser 132 and straight tube 133, and straight tube 133 is arranged on the outside of riser 132, and with riser 132 on the same axis; Riser 132 is fixed on tower tray 131, and the top of riser arranges capping plate 135, has some seams 136 at the circumference of riser, is circumferentially provided with the tangential flow guiding wing 134 at the riser near each bar seam.The inner surface (inwall) of straight tube 133 also offers groove 137.
During work; high-temperature flue gas through over-quenching cooling after by smoke inlet 15; first pretreatment unit is entered; the primary cycle liquid that one-level is held in liquid bath 6 flows to moisture film assembly 1 by primary cycle pump I 5 part; liquid film protection is formed to reactor; another part is transported to one-level spray system 2, the first order absorption liquid counter current contacting that high-temperature flue gas and one-level spray system 2 spray, and realizes preliminary chilling cooling.Flue gas after cooling and dispersed first order absorption liquid continue and flow to current downflow, enter water-drop-shaped structured packing assembly 3, and complete the cooling absorbing flue gas, dedusting and pre-desulfurization further at this; Flue gas continues to flow downward, the first order absorption liquid counter current contacting sprayed with turbulent impulse scrubber 19, the first order absorption liquid that turbulent impulse scrubber 19 sprays is carried by primary cycle pump II 20, rapids rushes absorbing liquid in decline process, be subject to the wind-force dissection of gas in tower and be dispersed into tiny drop/droplet, proceeding 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 is 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, by the passage 8 penetration depth processing unit between pretreatment unit and advanced treatment unit.Flue gas after first order absorption is upwards by filler assembly 11, and the secondary absorbing liquid sprayed with the secondary spray system above filler assembly 11 is in filler assembly 11 fully contact mass transfer, the secondary absorbing liquid absorbing sulfur dioxide falls into secondary and holds 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 dedusting and desulfurizing tower exhanst gas outlet 14.
Embodiment 1
Certain high-temperature flue-gas 180 DEG C, tolerance 160000Nm
3/ h, SO
2concentration is 500mg/Nm
3, dust concentration 100mg/Nm
3
Reactor operating condition: operating temperature 170 DEG C, operating pressure normal pressure, first order absorption liquid pH value is 6 ~ 7, and secondary absorbing liquid pH value is 8 ~ 9.Rapids rushes liquid-gas ratio 6:1, take NaOH solution as absorbent, and gas-liquid counter current contacts; Filler assembly operation liquid-gas ratio 3:1.
After process of the present invention, flue-gas temperature 60 DEG C, desulfuration efficiency 98%, efficiency of dust collection 98%.
Claims (20)
1. a Two-way Cycle flue-gas dust-removing and desulfurization tower, it is characterized in that, described desulfurizing tower comprises pretreatment unit and advanced treatment unit, the two forms " H " type or " U " shape Double-Tower Structure, wherein said pretreatment unit comprises smoke inlet, one-level spray system, water-drop-shaped structured packing assembly, turbulent impulse scrubber and one-level from top to bottom and holds liquid bath, described advanced treatment unit comprises secondary from bottom to top and holds the outlet of liquid bath, filler assembly, demister and purifying smoke, and pretreatment unit is communicated with the exhaust gases passes of advanced treatment unit by middle part.
2. according to dedusting and desulfurizing tower according to claim 1, it is characterized in that, described water-drop-shaped structured packing assembly comprise at least one deck, preferred two-layer above by some parallel connections, packing layer that the water-drop-shaped special pipe of horizontal positioned is formed, the water-drop-shaped special pipe of some parallel connections, horizontal positioned constitutes multiple parallel channels with collection section, aditus laryngis and dispersion section.
3. according to dedusting and desulfurizing tower according to claim 2, it is characterized in that, the cross section of described water-drop-shaped special pipe is water-drop-shaped, and its top is circular arc, and bottom is acute triangle.
4. according to the dedusting and desulfurizing tower described in claim 1,2 or 3, it is characterized in that, the both sides tube wall of described water-drop-shaped special pipe bottom offers groove.
5. according to dedusting and desulfurizing tower according to claim 1, it is characterized in that, in described pretreatment unit, on the top of desulfurizing tower tower wall, preferably moisture film assembly is set at the connecting portion of desulfurizing tower Ta Bi top and smoke inlet reducing.
6. according to dedusting and desulfurizing tower according to claim 5, it is characterized in that, arrange endless tube in tower wall surrounding, on endless tube, installation surface is to the nozzle of tower wall.
7. according to dedusting and desulfurizing tower according to 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 direct tube section is greater than the tower diameter of pretreatment unit, form the uncovered cannelure in a bottom lock, upper end at tower wall and reducing connecting portion, this cannelure is held liquid bath with one-level and is connected by pipeline.
8. according to dedusting and desulfurizing tower according to claim 7, it is characterized in that, the uncovered employing tooth-shape structure of described cannelure.
9. according to dedusting and desulfurizing tower according to claim 1, it is characterized in that, the filler assembly in described advanced treatment unit selects structured packing assembly.
10. according to dedusting and desulfurizing tower according to claim 9, it is characterized in that, described structured packing assembly adopts the structured packing of one deck water-drop-shaped.
11., according to dedusting and desulfurizing tower according to claim 1, is characterized in that, described pretreatment unit also comprises primary cycle pump I, primary cycle pump II and primary cycle pipeline; Described advanced treatment unit also comprises secondary cycle pump, secondary cycle pipeline and secondary spray system.
12., according to dedusting and desulfurizing tower according to claim 2, is characterized in that, described adjacent two-layer water-drop-shaped special pipe up and down staggered interval is arranged, and the parallel channels that namely special pipe of lower floor's filler and upper strata filler are formed aligns.
13., according to dedusting and desulfurizing tower according to claim 1, is characterized in that, described demister adopts straight tube shape deflector type demister; Straight tube shape deflector type demister comprises several demist assemblies arranged side by side, and each demist assembly includes riser and straight tube, and straight tube 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, has some seams at the circumference of riser, is circumferentially provided with the tangential flow guiding wing at the riser near each bar seam.
14., according to dedusting and desulfurizing tower according to claim 1, is characterized in that, hold in liquid bath and place floating basket, place oxidation catalyst in floating basket in the one-level of pretreatment unit.
15. 1 kinds of process for dusting and dsulfurizing fume, is characterized in that, the method use the arbitrary described flue-gas dust-removing and desulfurization tower of claim 1 to 14.
16., according to process for dusting and dsulfurizing fume according to claim 15, is characterized in that, described method comprises following content:
(1) high-temperature flue gas enters pretreatment unit, after the cooling of one-level spray system chilling, continues and flows to current downflow, enter water-drop-shaped structured packing assembly with absorbing liquid, and carries out the cooling absorbing flue gas, dedusting and pre-desulfurization at this;
(2) pH value that the flue gas after step (1) first order absorption and turbulent impulse scrubber spray is neutral or acid first order absorption liquid counter current contacting, proceeds cooling, dedusting and pre-desulfurization;
(3) the first order absorption liquid absorbing sulfur dioxide enters one-level and holds liquid bath, and is recycled by primary cycle pump I, primary cycle pump II and primary cycle pipeline;
(4) flue gas after pretreatment unit absorption is by exhaust gases passes penetration depth processing unit, upwards pass through filler assembly, and with filler assembly above the secondary absorbing liquid of the spray system pH value of spraying in alkalescence in the abundant contact mass transfer of filler assembly, complete final sweetening process;
(5) pass through demist assembly by flue gas after the purification of filler assembly, after gas-liquid separation, discharge from dust-removal and desulfurizing reactor exhanst gas outlet.
17., according to process for dusting and dsulfurizing fume according to claim 16, is characterized in that, the SO of described flue gas
2concentration is 500 ~ 5000mg/Nm
3, preferably 1000 ~ 4000mg/Nm
3; Dust concentration 100 ~ 700mg/Nm
3, preferably 200 ~ 500mg/Nm
3.
18., according to process for dusting and dsulfurizing fume according to claim 16, is characterized in that, the operating condition of described flue-gas dust-removing and desulfurization tower is: operating temperature is 100 ~ 350 DEG C, preferably 150 ~ 200 DEG C; Operating pressure is that normal pressure is to 1MPa; Treatment quantity is 500 ~ 1500m
3/ h, preferably 700 ~ 1200 m
3/ h; Absorbing liquid internal circulating load is 0.4m
3/ h ~ 7m
3/ h, preferred 0.5m
3/ h ~ 6m
3/ h.
19., according to process for dusting and dsulfurizing fume according to claim 16, is characterized in that, described absorbing liquid can be NaOH solution, Na
2cO
3solution, Mg (OH)
2solution or limewash Ca (OH)
2, preferred NaOH solution.
20., according to process for dusting and dsulfurizing fume according to claim 16, is characterized in that, the pH value of described first order absorption liquid is between 6 ~ 7, and the pH value of described secondary absorbing liquid is between 8 ~ 10.
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| CN201310540452.4A CN104607008B (en) | 2013-11-05 | 2013-11-05 | Double-circulating flue gas dust removal desulfurization tower and flue gas desulfurization method |
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