CN101708420A - Treatment technique for pollutants in sinter fume and spraying and absorbing tower thereof - Google Patents
Treatment technique for pollutants in sinter fume and spraying and absorbing tower thereof Download PDFInfo
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- CN101708420A CN101708420A CN200910310316A CN200910310316A CN101708420A CN 101708420 A CN101708420 A CN 101708420A CN 200910310316 A CN200910310316 A CN 200910310316A CN 200910310316 A CN200910310316 A CN 200910310316A CN 101708420 A CN101708420 A CN 101708420A
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Abstract
The invention discloses a treatment technique for pollutants in sinter fume and a spraying and absorbing tower thereof. After cooling and dedusting, the sinter fume is led into the spraying and absorbing tower, moves upwards to pass through at least two spraying and absorbing sections partitioned from up down in the spraying and absorbing tower, each spraying and absorbing section sprays and absorbs more than one pollutant in the sinter fume and the spraying and absorbing solution does not fall into the absorbing section of next layer, after passing through all the spraying and absorbing sections, the fume is demisted and exhausted from the top of the spraying and absorbing tower. The spraying and absorbing tower comprises a tower body, the tower body is partitioned into a demisting section, more than two spraying and absorbing sections and a fume inlet section from up down and a seriflux pool on the bottom of the tower body, and the adjacent spraying and absorbing sections are partitioned by a tower board assembly. The invention has the advantages that the loss of system resistance is small, the structure is simpler and more compact, the operation is convenient, the absorption effect is good, the treatment capacity is high and the like, and the invention can treat various pollutants in sinter fume.
Description
Technical field
The present invention is mainly concerned with chemical industry, environmental protection field, refers in particular to a kind of method and apparatus that pollutant in the sinter fume is handled.
Background technology
Sintering is one of technology main in the steel manufacture process, and according to statistics, the blast furnace burden of China about 75% is provided by sintering machine, and the sintering deposit annual production reached 416,900,000,000 t in 2007 with 2016% speed increase in the period of 2000～2006.When sintering industry was flourish, agglomeration for iron mine had also brought problems to environment, not only produces a large amount of dust, also discharges SO
2, NOx, CO
2, CO, HF, bioxin (PCDD), furans multiple harmful gaseous pollutants such as (PCDF).Though China's sintering plant was being obtained remarkable effect aspect the exhaust gas dust improvement in recent years, make slow progress for the improvement of other harmful components in the flue gas, most of enterprise does not take effective control measures so far as yet.Iron and steel enterprise enters SO in the atmosphere
290% (not comprising power plant for self-supply), NOx 48% all from sintering plant, therefore, sintering plant becomes the most important thing that iron and steel enterprise's air environmental pollution is administered, and SO in the sinter fume
2Then stand in the breach with the improvement of NOx.Existing main flume desulphurization denitration technology or only have the function of simple desulfurization, or only have simple denitration function.Since the eighties in 20th century, very active to the exploitation of combined desulfurization and denitration Study on Technology abroad, the method with practical value has activated carbon method, NOXSO, SNRB, electronic beam method etc.At present, on sintering flue gas desulfurization, obtain the activated carbon method that has only of application.And activated carbon desulfurization denitrification integral technology belongs to dry type absorption method technology, and its equipment volume is huge, and investment and operating cost are high, and the desulphurization denitration rate is low.Existing wet desulphurization and denitration technology efficient height, stable, small investment, but do not have to be implemented in the commercial plant of finishing not only desulfurization but also denitration in the same tower, so that two cover technologies can only independent operating, its floor space is big, investment and running cost height.Desulphurization denitration equipment is integrated, compact conformation, and investment and operating cost are low, are the developing direction in following desulphurization denitration field.
In addition, ammonia desulfurizing process used in the prior art so far open question be exactly the escape loss and the aerosol problem of ammonia.In traditional ammonia desulfurizing process or have a plurality of towers, before main absorption tower, increase a prewashing column, reduce the flue-gas temperature and the dust of removing in the flue gas of tower with prewashing column, increased equipment investment like this, there was the people that this technology is proposed new modification scheme afterwards, being about to prewashing column and desulfurizing tower unites two into one, whole tower is divided into three sections, though reduced the quantity of tower like this, but reason owing to the dividing plate self structure of used separation usefulness, cause the equipment resistance loss very big, it is complicated that technical process becomes, and investment cost does not significantly reduce, and the flue gas after the desulfurization is taken away a large amount of fugitive constituents and salt, the escape loss of ammonia is big, and the aerosol problem does not solve, to such an extent as to system's fluctuation of service.
Summary of the invention
The technical problem to be solved in the present invention just is: at the technical problem of prior art existence, provide the loss of a kind of SR little, structure is simple compact, easy and simple to handle more, good absorbing effect, disposal ability by force, the treatment process and the spray absorber thereof of pollutant in the sinter fume that can handle multiple pollutant in the sinter fume.
For solving the problems of the technologies described above, the present invention by the following technical solutions.
The treatment process of pollutant in a kind of sinter fume, it is characterized in that: sinter fume imports in the spray absorber after cooling, dedusting, flue gas moves upward and sprays absorber portion through what be separated into successively in the spray absorber more than two from top to bottom successively, each spray absorber portion all sprays absorption and sprays the spray absorber portion that absorption liquid does not fall into down one deck more than one pollutant in the sinter fume, discharges from the spray absorber top after handling by demist through the flue gas behind all spray absorber portions.
As a further improvement on the present invention:
Spray absorber portion in the described spray absorber comprises desulfurization section and denitration section, and described sinter fume is earlier through desulfurization section, and desulfurization section adopts wet desulfurizing process, the SO in this process in the sinter fume
2Dissolve in the absorption liquid, react with absorption liquid with desulfurization, the surplus dirt in the sinter fume also is captured, and finishes desulfurization and dedusting, and desulfurization falls into absorption liquid to be led back desulfurization section again behind the slurries pond of spray absorber bottom and recycle; Flue gas behind the described process desulfurization section enters the denitration section, and flue gas sprays the denitration of getting off with the denitration section and contacts with absorption liquid, and NOx is absorbed reaction, finishes denitration; Leading back the denitration section again after reacted denitration is directly discharged outside the spray absorber earlier with absorption liquid recycles.
The interior spray absorber portion of described spray absorber comprises the employing desulfurization section and cleans spray section that sinter fume is the process desulfurization section earlier, desulfurization section employing ammoniacal ammonium sulphate method wet desulfurizing process, the SO in this process in the sinter fume
2Dissolve in the absorption liquid, react with absorption liquid with desulfurization, the surplus dirt in the sinter fume also is captured, and finishes desulfurization and dedusting, and desulfurization falls into absorption liquid to be led back desulfurization section again behind the slurries pond of spray absorber bottom and recycle; Enter the cleaning spray section through the flue gas behind the desulfurization section, clean spray section and flue gas is cleaned with clear water or the low pH value absorption liquid of use; Handling the back through the flue gas behind all spray absorber portions by demist discharges from the spray absorber top.
The present invention further provides a kind of spray absorber, comprise tower body, be divided into the demist section in the described tower body from top to bottom, plural spray absorber portion, air inlet section and the slurries pond that is positioned at the tower body bottom, separate by the column plate assembly between described adjacent two spray absorber portions, it is characterized in that: described column plate assembly comprises plate body, offer more than one gas port on the described plate body, the air guide assembly is installed on the described gas port, described air guide assembly comprises liquid barrier and air guide channel, the bottom of described air guide channel is connected with gas port, and the described liquid barrier that is used for preventing that spray liquid from falling into air guide channel is installed on the top of air guide channel.
Comprise the water conservancy diversion flap passage more than a section in the described air guide channel, described water conservancy diversion flap passage is bending tube or bending tube or the bending tube for being combined by arc bending plate and quarter bend flap for having the right angle bending segment with arc bending segment.
The port of export of described air guide channel is provided with straight-through pipeline section.
Plate body edge, described plate body upper edge offers more than one collector tube.
The middle part offers the drainage trough of one or more on the described plate body, and plate body edge, described plate body upper edge offers annular collecting tank, and described drainage trough is communicated with annular collecting tank, and described annular collecting tank links to each other with collector tube.
One end of described liquid barrier is fixed on the air guide channel and along the direction that favours horizontal plane to be arranged.
Air guide assembly on the described plate body is array status to be arranged, the arranged direction difference of liquid barrier on adjacent two row's air guide assemblies.
Described air inlet section place is provided with pre-wash cooling dust arrester, described pre-wash cooling dust arrester comprises admission line and is installed in the interior spray assembly of admission line, described spray assembly is the spray gun that is arranged in the admission line middle part, or described spray assembly is the jet pipe that is arranged in more than in the admission line, is equiped with more than one nozzle on the described jet pipe.
Compared with prior art, advantage of the present invention just is:
1, the present invention is put into the processing of multiple pollutant in the sinter fume in the spray absorber and finishes, the spray that each spray absorber portion is independently finished more than one pollutants absorbs operation, the spray absorption liquid can not drop in next absorber portion mutually noninterfere each other.And, each spray absorber portion can adopt identical or different spray absorption liquid as required, sinter fume contacts with each section absorption liquid, after finishing absorption reaction, the spray absorption liquid can directly enter by-products production system or directly enter independently in the absorption liquid circulatory system, use repeatedly, can not take place to answer between the spray absorption liquid of heterogeneity, thereby guaranteed recycling or the preparation of byproduct of absorption liquid because of mixing mutually; Adopt technology of the present invention, can in a tower, finish the processing of multiple pollutant, or by the multi-stage spray absorber portion to repeatedly handling with a kind of pollutant, finally improve pollutant greatly and handle quantity or quality.
2, the column plate assembly that is adopted in the spray absorber of the present invention, drag losses is little, simple and compact for structure, with low cost, installation is made very convenient, it integrates multinomial functions such as demist, liquid collecting, uniform gas distribution, not only can collect the slurries that the denitration section lowers, and can remove particles such as mist that following one section gas carries secretly up, drop, dust, and alleviated the load of follow-up foam removal/demister, can also make the distribution of gas that flows through this column plate assembly more even; Column plate assembly of the present invention can also improve the turbulence intensity of air-flow, increases the mass transfer rate of top one section gas and absorption liquid reaction.
Description of drawings
Fig. 1 is the technological process principle schematic in the embodiment of the invention 1;
Fig. 2 is the technological process principle schematic in the embodiment of the invention 2;
Fig. 3 is the structural principle schematic diagram of spray column among the present invention;
Fig. 4 is the plan structure schematic diagram of column plate assembly among the present invention;
Fig. 5 is the structural representation at A-A place among Fig. 4;
Fig. 6 is a kind of plan structure schematic diagram of plate body;
Fig. 7 is the plan structure schematic diagram of another kind of plate body;
Fig. 8 is the syndeton schematic diagram of air guide assembly and plate body among the present invention;
Fig. 9 is the perspective view of air guide channel among the present invention;
Figure 10 is the cross sectional shape schematic diagram of first kind of air guide channel among the present invention;
Figure 11 is the cross sectional shape schematic diagram of second kind of air guide channel among the present invention;
Figure 12 is the cross sectional shape schematic diagram of the third air guide channel among the present invention;
Figure 13 is the structural representation of a kind of pre-wash cooling dust arrester among the present invention;
Figure 14 is the structural representation of another kind of pre-wash cooling dust arrester among the present invention.
Marginal data
1, tower body; 2, demist section; 21, demister; 3, denitration section; 31, denitration spray equipment; 4, desulfurization section; 41, desulfurization spraying layer; 5, air inlet section; 6, column plate assembly; 61, plate body; 611, gas port; 612, collector tube; 613, drainage trough; 614, annular collecting tank; 615, plate body unit; 62, air guide assembly; 621, liquid barrier; 622, air guide channel; 623, arc bending segment; 624, right angle bending segment; 625, quarter bend flap; 626, arc bending plate; 627, hold liquid portion; 628, straight-through pipeline section; 63, Ta Bi; 7, pre-wash cooling dust arrester; 71, admission line; 72, spray gun; 73, jet pipe; 74, nozzle; 75, high pressure liquid source; 76, compressed air source; 8, slurries pond; 9, denitration absorbing liquor circulating box; 10, denitration section circulating pump; 11, absorption tower circulating pump; 12, absorption tower excavationg pump; 13, gas outlet; 14, denitration slurries excavationg pump; 15, clean spray section; 151, cleaning spraying device; 152, clean the spray liquid circulating box; 153, clean the spray liquid circulating pump.
The specific embodiment
Below with reference to specific embodiment and Figure of description the present invention is described in further details.
The treatment process of pollutant in a kind of sinter fume, sinter fume imports in the spray absorber after cooling, dedusting, flue gas moves upward and sprays absorber portion through what be separated into successively in the spray absorber more than two from top to bottom successively, each spray absorber portion all sprays absorption and sprays the absorber portion that absorption liquid does not fall into down one deck more than one pollutant in the sinter fume, discharges from the spray absorber top after handling by demist through the flue gas behind all spray absorber portions.The present invention is put into the processing of multiple pollutant in the sinter fume in the spray absorber and finishes, the spray that each spray absorber portion is independently finished more than one pollutants absorbs operation, the spray absorption liquid can not drop in next absorber portion mutually noninterfere each other.And, each spray absorber portion can adopt identical or different spray absorption liquid as required, each section and sinter fume are finished behind the absorption reaction spray absorption liquid and can directly be entered by-products production system or directly enter independently in the absorption liquid circulatory system, use repeatedly, can not take place to answer between the spray absorption liquid of heterogeneity, thereby guarantee recycling or the preparation of byproduct of absorption liquid because of mutually mixing.
Embodiment 1: as shown in Figure 1, simultaneously sulfur dioxide in the sinter fume and two kinds of pollutants of nitrogen oxide are treated to example, spray absorber portion in the spray absorber comprises desulfurization section 4 and denitration section 3, sinter fume is earlier through desulfurization section 4, desulfurization section 4 adopts wet desulfurizing process, wet desulfurizing process comprises technologies such as limestone-gypsum method, ammonia-ammonia sulfate method, two alkaline process, the SO in this process in the sinter fume
2Dissolve in the absorption liquid, react with absorption liquid with desulfurization, the surplus dirt in the sinter fume also is captured, and finishes desulfurization and dedusting, and desulfurization falls into absorption liquid to be led back desulfurization section 4 again behind the slurries pond 8 of spray absorber bottom and recycle; Enter denitration section 3 through the flue gas behind the desulfurization section 4, denitration section 3 adopts wet method to carry out denitration, and common method is with HNO
3, NaOH, Na
2CO
3As the absorption liquid denitration, the present embodiment absorption liquid is rare HNO Deng solution
3The denitration absorption liquid counter current contacting that flue gas and denitration section 3 spray, NOx is absorbed reaction, finishes the denitration operation; Reacted denitration is discharged earlier directly with absorption liquid and is led back denitration section 3 again behind the outer denitration absorbing liquor circulating box 9 of spray absorber and recycle.
As shown in figures 1 and 3, spray absorber of the present invention, comprise tower body 1, the slurries pond 8 that is divided into demist section 2, plural spray absorber portion, air inlet section 5 in the tower body 1 from top to bottom and is positioned at tower body 1 bottom, separate by column plate assembly 6 between the adjacent spray absorber portion, this column plate assembly 6 not only plays the effect of separating each absorber portion, can also make the spray absorption liquid that respectively sprays absorber portion can not fall into down in one deck spray absorber portion, and can remove the spray absorption liquid of the previous spray absorber portion of being carried secretly in the flue gas as far as possible.Simultaneously sulfide in the sinter fume and two kinds of pollutants of itrated compound are treated to example, the spray absorber portion is two, and one is desulfurization section 4, and another is a denitration section 3, and denitration section 3 is positioned at the top of desulfurization section 4.Demist section 2 is provided with multistage demister 21, is mainly used to remove a spot of moisture of carrying secretly in the flue gas.Denitration section 3 is provided with one or more layers denitration spray equipment 31 according to operating mode, and this denitration spray equipment 31 links to each other with tower body 1 denitration absorbing liquor circulating box 9 outward with denitration section circulating pump 10 by pipeline.Can use rare HNO in the denitration absorbing liquor circulating box 9
3The liquid of deriving through column plate assembly 6 flows into denitration absorbing liquor circulating box 9 by the road.Desulfurization section 4 comprises multi-layer desulfurization spraying layer 41, every layer of nozzle that can adopt different size, the SO in the flue gas
2Contact with the absorption liquid that sprays is reverse during through desulfurization section 4, absorption reaction takes place, the slurries after the absorption fall into the slurries pond 8 at the bottom of the tower, and slurries pond 8 needs to mend continuously ammoniacal liquor.The port of export in slurries pond 8 is divided into two-way, and one the road links to each other with desulfurization spraying layer 41 with absorption tower circulating pump 11 by the road, and slurries are again through the nozzle ejection, recycling; Another road links to each other with plate and frame filter press with absorption tower excavationg pump 12 by the road, goes the triple effect crystallizer to prepare the thiamines product after plate and frame filter press filters.In the present embodiment, air inlet section 5 places are provided with pre-wash cooling dust arrester 7, can be with cooling high-temperature fume to the suitable temperature of going into the tower reaction, and remove most of dust in the flue gas.This pre-wash cooling dust arrester 7 comprises admission line 71 and is installed in spray assembly in the admission line 71, referring to Figure 14, the spray assembly can be for being arranged in the spray gun 72 at admission line 71 middle parts, admission line 71 is skewed layout and the port of export towards the bottom of tower body 1, and spray gun 72 links to each other with high pressure liquid source 75, compressed air source 76; Referring to Figure 13, the spray assembly can also be equiped with more than one nozzle 74 for being arranged in the jet pipe 73 in the admission line 71 more than one on the jet pipe 73.Pre-wash cooling dust arrester 7 and demist section 2 can directly adopt general industry water as the water source.
As Fig. 4, Fig. 5 and shown in Figure 6, column plate assembly 6 comprises plate body 61 among the present invention, offer more than one gas port 611 on the plate body 61, gas port 611 is square hole in the present embodiment, and plate body 61 can be tolerated that absorbent slurry washes away and the material that corrodes is made by polypropylene, fiberglass, alloy or other.Air guide assembly 62 is installed on the gas port 611, and air guide assembly 62 comprises liquid barrier 621 and air guide channel 622, and the bottom of air guide channel 622 is connected with gas port 611, and air guide channel 622 is one to be used for transmitting the cavity of the circumferential sealing of gas.Be used for preventing that liquid barrier 621 that spray liquid falls into air guide channel 622 is installed on the top of air guide channel 622, also can air guide channel 622 and liquid barrier 621 is one-body molded.Form the liquid portion 627 of holding between the adjacent air guide channel 622.Plate body edge, plate body 61 upper edge offers more than one collector tube 612, in the present embodiment, the middle part offers the drainage trough 613 of one or more on the plate body 61, plate body edge, plate body 61 upper edge offers annular collecting tank 614, drainage trough 613 is communicated with annular collecting tank 614, and annular collecting tank 614 links to each other with collector tube 612.The liquid of denitration spray equipment 31 ejections of column plate assembly more than 6 is derived through collector tube 612 after can importing annular collecting tank 614 by drainage trough 613, converges in the collecting tank in tower wall 63 outsides.As shown in Figure 7, in another embodiment, also can also not establish annular collecting tank 614 and drainage trough 613, liquid directly flows in the collector tube 612 from plate body 61 surfaces, and collector tube 612 links to each other with denitration absorbing liquor circulating box 9 by pipeline.
Referring to Figure 10, Figure 11 and Figure 12, comprise the water conservancy diversion flap passage (being example with one section water conservancy diversion flap passage only in the present embodiment) more than a section in the air guide channel 622, water conservancy diversion flap passage is bending tube or bending tube or the bending tube for being combined by arc bending plate 626 and quarter bend flap 625 for having right angle bending segment 624 with arc bending segment 623.The port of export of air guide channel 622 is provided with straight-through pipeline section 628.Referring to Fig. 9 and Figure 12, water conservancy diversion flap passage adopts the bending tube that is combined by arc bending plate 626 and quarter bend flap 625 in the present embodiment.
In the present embodiment, an end of liquid barrier 621 is fixed on the air guide channel 622 and along the direction that favours horizontal plane to be arranged.Air guide assembly 62 on the plate body 61 is array status to be arranged, the arranged direction difference of liquid barrier 621 on adjacent two row's air guide assemblies 62.In other embodiments, air guide assembly 2 can also be state arrangement ringwise, the arranged direction difference of liquid barrier 621 on the two adjacent rings air guide assembly 2; Perhaps air guide assembly 2 can also adopt array to add the combining form of ring-type as required.
In the present embodiment, plate body 61 is spliced by the plate body unit 615 more than two, convinces pore 611 by patient analysis on each plate body unit 615, air guide assembly 62 is installed, and order making, easier for installation can realize large-sized design.
Operation principle: the flue gas of Jing Huaing is not through pre-wash cooling dust arrester 7 time, contact with the water smoke that spray assembly spray in the admission line 71 forms, high-temperature flue gas evaporates most water smoke, self temperature reduces, state reaches capacity, dust in flue gas is condensed under the water smoke effect simultaneously, enters along with the high speed flue gas in the tower body 1 on absorption tower.Admission line 71 has certain inclination angle with slurries pond 8 liquid levels, and the high speed flue gas clashes into liquid level under effect of inertia, most dust are become trapped in the slurries in slurries pond, tower body 1 bottom 8.The high speed flue gas contacts with the spraying following current that the spray assembly forms, good dedusting effect, and crushing is little.Use the aerosol spray gun 72 of multistage single fluid atomizer 74 or many two-fluids in the present embodiment, be arranged in the centre of admission line 71, can use industry water.
In the tower flue gas when desulfurization section 4 with the abundant counter current contacting of the absorption liquid of spray, desulfurization section 4 is provided with multilayer spraying layer 41, desulfuration recycle pump of every layer of nozzle correspondence can be according to SO
2Load different choice turn on pump quantity, the SO in this process in the flue gas
2Dissolve in the absorption liquid, react rapidly with absorption liquid, surplus dirt in the flue gas also is captured, thereby reach the purpose of desulfurization and dedusting, the simultaneous oxidation blower fan constantly mends oxidation air in tower entoplasm liquid pool 8, oxidize away unsettled sulphite, under the effect of absorption tower excavationg pump 12, will reach the desulfurization slurry that finite concentration requires and send to the production desulfurization product.
The spray absorption liquid of desulfurization section 4 is controlled under the slant acidity condition, adopts big liquid-gas ratio spray, avoids the escaping of ammonia loss under the high pH.The absorption liquid of desulfurization section 4 and sulfur in smoke reaction, and be oxidized to (NH
4)
2SO
4, its total chemical equation is as follows:
2NH
3-H
2O-SO
2→(NH
4)
2HSO
3 (1)
(NH
4)
2HSO
3-1·2O
2→(NH
4)
2SO
4 (2)
Divide reaction, the absorption of sulfur dioxide
SO
2-H
2O→H
2SO
3 (3)
H
2SO
3-(NH
4)
2SO
4→NH
4HSO
3-NH
3HSO
4 (4)
H
2SO
3-(NH
4)
2SO
3→2NH
4HSO
3 (5)
SO
2At first enter in the absorption liquid, see reaction (3), then with solution in (NH
4)
2SO
4(NH
4)
2SO
3React, see reaction (4), (5).In slurries pond, absorption tower 8, run into the ammonia of adding, following reaction then take place:
NH
3HSO
4-NH
3→(NH
3)
2SO
4 (6)
NH
3HSO
3-NH
3→(NH
3)
2SO
3 (7)
H
2SO
3-NH
3→NH
3HSO
3 (8)
(NH
4)
2SO
3Run into the oxygen that blasts in oxygen in the flue gas and the stock tank, following reaction take place:
(NH
2)
2SO
4-1·2O
2→(NH
3)
2SO
4 (9)
When the flue gas of process desulfurization section 4 entered column plate assembly 6, drop and dust with the desulfurization slurry that is removed the saliferous of partly carrying secretly forms can not be entrained to the desulfurization absorption liquid denitration section 3; And be evenly distributed by dividing plate through the flue gas after the column plate assembly 6, created advantage, reduced denitration section 3 quantity of circulating water, reduced energy consumption, alleviated the load of cat head demist section 2 simultaneously, reduce investment outlay for denitration section 3.Because the effect of column plate assembly 6 has avoided the absorption liquid of desulfurization section 4 to enter in the absorption liquid of denitration section 3, desulfurization in two spray absorber portions, denitrification process are independently carried out fully, can obtain the byproduct of desulfurization and denitration simultaneously.Two towers that the present invention will need originally are merged into a tower, have reduced floor space, have saved resource, are particularly suitable for the project of modernizing and expanding the existing factory.
The detailed process that air communication is crossed column plate assembly 6 is: when air communication is crossed plate body 61, be introduced in the gas port 611 on the plate body 61, speed has just had lifting, enters the bending segment in the air guide channel 622 then, and this bending segment is actual to be a water conservancy diversion flap passage of being made up of bending tube.Gas strikes on the wall of first corner after entering water conservancy diversion flap passage, most drop and dust are captured, air-flow changes the direction of an angle along the water conservancy diversion flap then, the air-flow that changes direction along water conservancy diversion flap passage through second corner, will do centrifugal motion at this corner air-flow with certain angle, centrifugal force makes the drop and the dust that are not removed in first corner be thrown to water conservancy diversion flap wall second corner, thereby is captured down; The air-flow that changes direction enters next corner along water conservancy diversion flap passage, by that analogy, removes the fine droplets and the dust that come on the deentrainment gradually.The velocity of flue gas that comes out from straight-through pipeline section 628 slowly returns to the gas speed that enters before the column plate, but turbulence intensity increases, and has improved the absorption efficiency to NOx.The flue gas and the denitration section spray absorption liquid that come out from column plate assembly 6 clash into mutually, produce rectified action, and the air-flow of denitration section is distributed further evenly, have prevented that the flue gas of denitration section from producing short circuit phenomenon.Interact through this process being carried out the absorption liquid that numerical simulation finds that the air-flow that comes from water conservancy diversion flap passage stream and a last tower section lower, be evenly distributed substantially within a certain height afterwards.The absorption liquid that a last tower section lowers drops down onto on the plate body 61 after passing this section air-flow, by drainage to drainage trough 613 and annular collecting tank 614, flow into collector tube 612, import in the outer denitration absorbing liquor circulating box 9 of tower, absorption liquid is squeezed in the denitration spray equipment 31 by denitration section circulating pump 10 and is recycled in the denitration absorbing liquor circulating box 9.
The flue gas of handling by denitration enters demist section 2, and under the effect of demister 21, the fine droplet of carrying secretly in the flue gas is condensed under bump and centrifugal action and catches, and enters chimney through the flue gas after the demist through the gas outlet 13 at tower body 1 top.
Embodiment 2: as shown in Figure 2, with two spray absorber portions sulfur dioxide in the sinter fume is treated to example, sinter fume is earlier through desulfurization section 4, and desulfurization section 4 adopts ammonia-ammonia sulfate method wet desulfurizing process, the SO in this process in the sinter fume
2Dissolve in the absorption liquid, react with absorption liquid with desulfurization, the surplus dirt in the sinter fume also is captured, and finishes desulfurization and dedusting, and desulfurization falls into absorption liquid to be led back desulfurization section 4 again behind the slurries pond 8 of spray absorber bottom and recycle; Enter cleaning spray section 15 through the air-flow behind the desulfurization section 4, clean spray section 15 usefulness clear water or use low pH value absorption liquid that air-flow is cleaned.Crossing demist processing back through the air communication behind all spray absorber portions discharges from the spray absorber top.
Referring to Fig. 2, be applied to the spray column of present embodiment, comprise tower body 1, the slurries pond 8 of be divided into demist section 2 in the tower body 1 from top to bottom, cleaning spray section 15, desulfurization section 4, air inlet section 5 and be positioned at tower body 1 bottom is cleaned between spray section 15 and the desulfurization section 4 and is separated by column plate assembly 6.Clean spray section 15 and be provided with one or more layers cleaning spraying device 151 according to operating mode, this cleaning spraying device 151 links to each other with tower body 1 cleaning spray liquid circulating box 152 outward with cleaning spray liquid circulating pump 153 by pipeline.Clean and directly to use clear water in the spray liquid circulating box 152 or use low pH value absorption liquid.The liquid of deriving through column plate assembly 6 flows into cleaning spray liquid circulating box 152 by the road.In the present embodiment, the structure of all the other each sections is all identical with embodiment 1 with operation principle, does not repeat them here.After adopting two-stage desulfurization, can effectively reduce the escaping of ammonia loss and aerocolloidal generation.Because the absorption liquid of the ammonia process of desulfurization and intermediate product all have volatility, through carrying the ammonia and the fine droplet that has dissolved ammonium salt of a large amount of escapes in the flue gas after desulfurization section 4 processing, if untimely removing is easy to produce aerosol.After flue gas is handled by desulfurization section 4, enter column plate assembly 6, the fine droplet of ammonium salt that has been removed the part escape ammonia and the dissolving of carrying secretly, alleviated the load of demister 21, simultaneously flue gas is evenly distributed by column plate assembly 6, and with the absorption liquid counter current contacting of cleaning spray section 15, absorption liquid absorbs the ammonia of escaping, the fine droplet that will dissolve ammonium salt by collision, cohesion condenses into big drop, and drop settles down under the gravity effect.The absorption liquid that cleaning spray section 15 sprays drops on the column plate assembly 6, is imported into the cleaning layer circulating box after the collection, recycles.By cleaning the flue gas after spray section 15 is handled, enter chimney through the gas outlet 13 at tower body 1 top after handling through demister 21 demists.
In preferred embodiment, can also on the basis of embodiment 2 two-stage desulfurizations, add the denitration section 3 consistent, thereby improve disposal ability pollutant in the sinter fume with structure among the embodiment 1.
The above only is a preferred implementation of the present invention, and protection scope of the present invention also not only is confined to the foregoing description, and all technical schemes that belongs under the thinking of the present invention all belong to protection scope of the present invention.Should be understood that; for those skilled in the art; in the some improvements and modifications that do not break away under the principle of the invention prerequisite; for example: replace, adopt the liquid barrier 621 more than two, the gas port 611 on the plate body 61 to make circular hole or other shapes or the like into the liquid barrier 621 usefulness curved slabs of ramp type or the tabular component of other shapes, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (11)
1. the treatment process of pollutant in the sinter fume, it is characterized in that: sinter fume imports in the spray absorber after cooling, dedusting, flue gas moves upward and sprays absorber portion through what be separated into successively in the spray absorber more than two from top to bottom successively, each spray absorber portion all sprays absorption and sprays the spray absorber portion that absorption liquid does not fall into down one deck more than one pollutant in the sinter fume, discharges from the spray absorber top after handling by demist through the flue gas behind all spray absorber portions.
2. the treatment process of pollutant in the sinter fume according to claim 1, it is characterized in that: the spray absorber portion in the described spray absorber comprises desulfurization section and denitration section, described sinter fume is earlier through desulfurization section, desulfurization section adopts wet desulfurizing process, the SO in this process in the sinter fume
2Dissolve in the absorption liquid, react with absorption liquid with desulfurization, the surplus dirt in the sinter fume also is captured, and finishes desulfurization and dedusting, and desulfurization falls into absorption liquid to be led back desulfurization section again behind the slurries pond of spray absorber bottom and recycle; Flue gas behind the described process desulfurization section enters the denitration section, and flue gas sprays the denitration of getting off with the denitration section and contacts with absorption liquid, and NOx contacts with the absorption liquid that sprays, and NOx is absorbed reaction; Leading back the denitration section again after reacted denitration is directly discharged outside the spray absorber earlier with absorption liquid recycles.
3. the treatment process of pollutant in the sinter fume according to claim 1, it is characterized in that: the spray absorber portion in the described spray absorber comprises the employing desulfurization section and cleans spray section, sinter fume is earlier through desulfurization section, desulfurization section adopts ammonia-ammonia sulfate method wet desulfurizing process, the SO in this process in the sinter fume
2Dissolve in the absorption liquid, react with absorption liquid with desulfurization, the surplus dirt in the sinter fume also is captured, and finishes desulfurization and dedusting, and desulfurization falls into absorption liquid to be led back desulfurization section again behind the slurries pond of spray absorber bottom and recycle; Enter the cleaning spray section through the flue gas behind the desulfurization section, clean spray section and as absorption liquid flue gas is cleaned with clear water; Handling the back through the flue gas behind all spray absorber portions by demist discharges from the spray absorber top.
4. spray absorber, comprise tower body (1), be divided into demist section (2) in the described tower body (1) from top to bottom, plural spray absorber portion, air inlet section (5) and the slurries pond (8) that is positioned at tower body (1) bottom, separate by column plate assembly (6) between the described adjacent spray absorber portion, it is characterized in that: described column plate assembly (6) comprises plate body (61), offer more than one gas port (611) on the described plate body (61), air guide assembly (62) is installed on the described gas port (611), described air guide assembly (62) comprises liquid barrier (621) and air guide channel (622), the bottom of described air guide channel (622) is connected with gas port (611), describedly is used for preventing that spray liquid from falling into the top that the liquid barrier of air guide channel (622) (621) is installed on air guide channel (622).
5. spray absorber according to claim 4, it is characterized in that: comprise the water conservancy diversion flap passage more than a section in the described air guide channel (622), bending tube or bending tube or the bending tube for by arc bending plate (626) and quarter bend flap (625) combine for have right angle bending segment (624) of described water conservancy diversion flap passage for having arc bending segment (623).
6. spray absorber according to claim 5 is characterized in that: the port of export of described air guide channel (622) is provided with straight-through pipeline section (628).
7. according to claim 4 or 5 or 6 described spray absorbers, it is characterized in that: plate body edge, described plate body (61) upper edge offers more than one collector tube (612).
8. spray absorber according to claim 7, it is characterized in that: described plate body (61) is gone up the middle part and is offered the drainage trough (613) of one or more, plate body edge, described plate body (61) upper edge offers annular collecting tank (614), described drainage trough (613) is communicated with annular collecting tank (614), and described annular collecting tank (614) links to each other with collector tube (612).
9. according to claim 4 or 5 or 6 described spray absorbers, it is characterized in that: an end of described liquid barrier (621) is fixed in air guide channel (622) and goes up and arrange along the direction that favours horizontal plane.
10. spray absorber according to claim 9 is characterized in that: the air guide assembly (62) on the described plate body (61) is array status to be arranged, and adjacent two row's air guide assemblies (62) are gone up the arranged direction difference of liquid barrier (621).
11. according to claim 4 or 5 or 6 described spray absorbers, it is characterized in that: described air inlet section (5) locates to be provided with pre-wash cooling dust arrester (7), described pre-wash cooling dust arrester (7) comprises admission line (71) and is installed in the interior spray assembly of admission line (71), described spray assembly is for being arranged in the spray gun (72) in the middle part of the admission line (71), or described spray assembly is the jet pipe (73) that is arranged in more than in the admission line (71), is equiped with more than one nozzle (74) on the described jet pipe (73).
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| CN200910310316A CN101708420A (en) | 2009-11-24 | 2009-11-24 | Treatment technique for pollutants in sinter fume and spraying and absorbing tower thereof |
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| CN200910310316A CN101708420A (en) | 2009-11-24 | 2009-11-24 | Treatment technique for pollutants in sinter fume and spraying and absorbing tower thereof |
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Application publication date: 20100519 |