CN103736381B - Dust removal device and dust removal method for sintering flue gas by shunted and graded desulfurization - Google Patents

Dust removal device and dust removal method for sintering flue gas by shunted and graded desulfurization Download PDF

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CN103736381B
CN103736381B CN201310740151.6A CN201310740151A CN103736381B CN 103736381 B CN103736381 B CN 103736381B CN 201310740151 A CN201310740151 A CN 201310740151A CN 103736381 B CN103736381 B CN 103736381B
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flue gas
tower
desulfurizing tower
bellows
section
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CN103736381A (en
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郭秉楠
朱鹏程
滕朝华
赵永刚
舒小明
郭东明
吴绍强
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Aerospace Environmental Engineering Co Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y02A50/2351Atmospheric particulate matter [PM], e.g. carbon smoke microparticles, smog, aerosol particles, dust

Abstract

The invention relates to a dust removal device for sintering flue gas by shunted and graded desulfurization. The device comprises an air bellow set for sintering machines, a desulfurization tower and a blast furnace gas diffusion tower, wherein the air bellow set for sintering machines is connected with a flue gas inlet of the desulfurization tower, a flue gas outlet of the desulfurization tower and an inlet of the blast furnace gas diffusion tower are connected together, the top of the blast furnace gas diffusion tower is provided with an outlet, and a burner is arranged at the outlet and on the outside of the blast furnace gas diffusion tower. By using the device disclosed by the invention, a whole flue gas treatment can be performed, so that the emission of sulfur dioxide reaches the standard, and the pollution to the environment caused by dioxin in flue gas can be eliminated as far as possible; high-sulfur flue gas and low-sulfur flue gas, after being shunted, enter a same desulfurization tower to be subjected to graded desulfurization treatment, so that compared with a traditional mode of mixing high-sulfur flue gas and low-sulfur flue gas firstly and then carrying out whole flue gas treatment on the obtained mixture, the mode according to the invention has the advantages that the size of the desulfurization tower is smaller, the manufacturing cost is lower, and the investment and running costs of the desulfurization tower are reduced.

Description

A kind of sinter fume shunting grading desulfurization dust-removing device and dust collection method
Technical field
The invention belongs to Ferrous Metallurgy sintering gas purifying field, especially a kind of shunting grading desulfurization dust-removing device for Ferrous Metallurgy sinter fume and dust collection method.
Background technology
" 12 " period, China explicitly called for, and steel industry realizes full desulfurization.Sintering flue gas desulfurization is the emphasis of steel industry environmental improvement always, China's steel industry sinter fume complicated component, and fluctuation is comparatively large, has following characteristics: one is that exhaust gas volumn is large, and one ton of sintering deposit produces flue gas at 4000 ~ 6000m 3; Two is that sulfur dioxide concentration changes greatly, and scope is at 400 ~ 5000mg/Nm 3between; Three is that variations in temperature is large, is generally 80 DEG C to 180 DEG C; Four is that changes in flow rate is large, and amplitude of variation is up to more than 40%; Five is that moisture is large and unstable, is generally 10 ~ 13%; Six is that oxygen content is high, is generally 15 ~ 18%; Seven is containing multiple pollutant component, except containing except sulfur dioxide, dust, also containing heavy metal, dioxin, nitrogen oxide etc.These features add the difficulty that steel sintering SO 2 from fume is administered all to a certain extent.
At the coordinates measurement of iron and steel production sintering circuit Zhong bioxin mainly through " de novo formation ", namely under 250 ~ 450 degree of temperature ranges and oxidizing atmosphere condition, large molecular carbon and organochlorine generate under the catalytic action of the heavy metal ion such as copper and iron.
Since issuing " steel industry sintering flue gas desulfurization embodiment " from July, 2009 Ministry of Industry and Information, the policies and regulations of iron and steel desulfurization are increasingly strict.According to " steel sintering, pelletizing industrial air pollution thing discharge standard " (GB28662-2012) that play up-to-date execution on October 1st, 2012, the SO of existing enterprise and newly-built enterprise 2emission limit is respectively 600mg/m 3and 200mg/m 3, dioxin emission limit is respectively 1.0ng-TEQ/m 3and 0.5ng-TEQ/m 3.
In current steel industry sintering flue gas desulfurization technology, according to the form of desulfurization product, substantially can be divided into three classes: Wet Flue Gas Desulfurization Technique, semi-dry desulphurization technology, desulfurization by dry method.Classify by technique, current China sintering flue gas desulfurization has more than the ten kind technology such as ciculation fluidized bed process, limestone-gypsum method, SDA rotary spraying technique, ammonia process, active carbon adsorption, magnesium oxide method, dense-phase tower method, MEROS method, have accumulated certain application experience.
At present, China scientific and technical personnel have carried out some research in sintering flue gas desulfurization dedusting technology, and if notification number is the patent of invention of CN101306311A, because be full flue gas desulfurization, cost is very high, and Ground arrangement is nervous; If notification number is the patent of CN201302374Y, although carried out selective desulfurization to sinter fume, greatly reduced equipment and operating cost, if not disengagement section because of ore deposit change sulfur content raise time sulphur emissions can be caused to exceed standard; If notification number is the patent of CN102003886B, also differentiated treatment has been done to the flue gas of bellows different parts, except high-sulfur flue gas processes entirely, low-sulfur flue gas is divided by flue gas leads the exhaust gas volumn that device regulates desulfurization process, further increase the reliability of total system flue gas qualified discharge, but still have part low-sulfur flue gas untreated and directly discharge, and low-sulfur fume treatment ratio control difficulty is larger.
According to dioxin formation mechanism and emission performance in process, mainly contain following several method and control it and generate and discharge: (1) adds inhibitor to improve sinter bed condition, prevent Sheng Cheng bioxin at synthetic and other prerequisite compounds.As sprayed ammonia or using urea, to control the catalytic action of the metal pair bioxin such as copper in flue dust.(2) flue gas recirculation, makes the flue gas of generation reenter sinter layer, reduces bioxin amount and other pollutants; (3) rapid cooling, makes flue gas by below 250 ~ 450 degree of temperature section rapid coolings to 200 degree; (4) active carbon/active lignite absorption is in conjunction with sack cleaner, and shortcoming soot load increases, and after absorption, active carbon is difficult to regeneration and process; (5) catalyst reduction, Shi bioxin is oxidized at low temperatures and generates CO 2, the inorganic matter such as hydration HCl, shortcoming is that the expensive and easy generation of catalyst is poisoning, blockage problem.
By retrieval, find patent publication us as relevant to patent application of the present invention in next chapter:
Sintering smoke wet method sulphur removing and dust removing technology (CN101168118), provides a kind of sintering smoke wet method sulphur removing and dust removing technology.Sinter fume first carries out cooling defluorinate after supercharging, the HF in flue gas is trapped and by cigarette temperature drop to less than 80 DEG C by alkali lye; Flue gas enters high-efficiency desulfurization absorption tower subsequently, by the effect of swirl-flow devices in air jet pipe in tower, makes flue gas high-speed rotary pour in slurry pool, and flue gas is broken and fully mix with slurries in slurries, completes desulfurization and dedusting process; Neat stress after demist is discharged from chimney by after sintering waste heat steam reheating.This desulfurization dust-removing technique can realize the desulfuration efficiency of more than 95% and the efficiency of dust collection of 99%.The setting of cooling defluorinate device ensure that the thermal safety on absorption tower and reduces the extent of corrosion of tower inside.High-efficiency desulfurization absorption tower is without slurry circulating pump, and movement-less part in tower, gas-liquid contact is effective.Utilize the hot mode again of sintering waste heat steam to eliminate conventional GGH, improve the stability of system cloud gray model and reduce system cost.
By contrast, there are the different of essence in patent application of the present invention and above-mentioned patent publication us.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art part, there is provided one not only classification can to process full flue gas, suitably reduce investment and operating cost, and make sulfur dioxide (SO2) emissions up to standard, decrease sinter fume shunting grading desulfurization dust-removing device and the dust collection method of dioxin emission simultaneously, the method is simple, be easy to operation, with low cost, good dedusting effect.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of sinter fume shunting grading desulfurization dust-removing device, described device comprises the bellows group of sintering machine, desulfurizing tower and blast-furnace gas diffusing tower, the bellows group of described sintering machine is connected with the smoke inlet of desulfurizing tower, the exhanst gas outlet of described desulfurizing tower and the entrance of blast-furnace gas diffusing tower link together, the top of described blast-furnace gas diffusing tower arranges an outlet, arranges a burner outside the blast-furnace gas diffusing tower in this exit;
Set gradually in the middle part of bellows head end, bellows in the bellows group of described sintering machine and bellows end;
In tower body below described desulfurizing tower exhanst gas outlet, coaxial spaced is provided with liquid storage section, the first spray section, eddy flow processing section, the second spray section and demist section successively from bottom to top, one circulating pump is set outside desulfurizing tower, this circulation delivery side of pump is linked together with the first spray section and the second spray section respectively by pipeline, and the input of this circulating pump is connected with liquid storage section and is installed together;
In described liquid storage section, the first smoke inlet is set with the side in the tower body between the first spray section is communicated with, the sidewall in the tower body of described eddy flow processing section with the desulfurizing tower between the second spray section is communicated with the second smoke inlet is set;
Dechlorinate with the booster fan be arranged at outside desulfurizing tower, the first successively output of prewashing device, the first air-introduced machine, the first sack cleaner and the first quencher of described first smoke inlet is connected together, and the input of described first quencher is connected with in the middle part of bellows; Described second smoke inlet successively be arranged at the dechlorinate output of prewashing device, the second air-introduced machine, the second sack cleaner and the second quencher of second outside desulfurizing tower and be connected together, the input of described second quencher links together with bellows head end and bellows end respectively.
And, between the second spray section and demist section, multiple spray section is set.
And, described eddy flow processing section comprises upper sealing panel, lower seal plate, whirl cylinder and cyclone, between described upper sealing panel and lower seal plate uniform interval seal vertically arrange vertically several, upper and lower opening, the whirl cylinder of hollow, a cyclone is coaxially installed in bottom in described whirl cylinder, described cyclone comprises swirl vane axle and swirl vane, swirl vane circularizes arrangement around swirl vane axle, and tilt to be installed on swirl vane axle, swirl vane axle and whirl cylinder are coaxially installed, the outer rim co-axial seal of described upper sealing panel and lower seal plate is installed on tower body inwall.
And described swirl vane is the blade construction that propeller type tilts, and its angle of inclination becomes 30-60 degree with axis.
And the quantity of described swirl vane is 3 ~ 12, and swirl vane takes plane or curve form.
And the quantity of described whirl cylinder is 10 ~ 100, whirl cylinder height is 300mm ~ 1000mm.
Utilize sinter fume as above to shunt the dust collection method of grading desulfurization dust-removing device, comprise the steps:
(1) sinter fume enters in the bellows group of sintering machine, high-sulfur flue gas in the middle part of the bellows of bellows group after being arranged on the first quencher between bellows group and desulfurizing tower, the first sack cleaner, the first air-introduced machine, the first dechlorination prewashing device and booster fan, enters in desulfurizing tower from the first smoke inlet of desulfurizing tower successively;
(2) the bellows head end of bellows group and the low-sulfur flue gas of bellows end are successively after being arranged on the second quencher between bellows group and desulfurizing tower, the second sack cleaner, the second air-introduced machine and the second dechlorination prewashing device, enter in desulfurizing tower from the second smoke inlet of desulfurizing tower;
(3) the spray liquid had in the liquid storage section that desulfurizing tower inner bottom part arranges by the circulating pump that desulfurizing tower is arranged outward pumps into, then spray liquid is sprayed from the first spray section and the second spray section, high-sulfur flue gas is after the first smoke inlet enters desulfurizing tower, desulfurizing agent effect borehole cooling under the first spray section spray also enters eddy flow processing section after partial desulfurization, under cyclone effect, High Rotation Speed upwards, desulfurizing agent high speed rotary-cut under spraying with the second spray section, blending, complete main desulphurization reaction; In space between the second spray section and eddy flow processing section, low-sulfur flue gas, after the second smoke inlet enters desulfurizing tower, mix, and the desulfurization agent under spraying with the second spray section reacts with the high-sulfur flue gas through the backward upper flowing of eddy flow processing section;
(4) the high-sulfur flue gas after purification and the mixed flue gas of low-sulfur flue gas enter in demister the drop removed in flue gas, flue gas after demist imports in blast-furnace gas diffusing tower from the exhanst gas outlet of desulfurizing tower through pipeline, after mixing with blast furnace gas in blast-furnace gas diffusing tower, diffuse after the burned device of blast-furnace gas diffusing tower top exit is lighted and enter air.
And, described step (3) on the second spray section, arrange 1 again to multiple spray section.
And the outlet temperature of described first quencher and the second quencher controls at 150 ~ 180 DEG C.
And the outlet temperature of described first dechlorination prewashing device and the second dechlorination prewashing device controls at 80 ~ 90 DEG C.
Advantage of the present invention and good effect are:
1, apparatus of the present invention not only can carry out full fume treatment, make sulfur dioxide (SO2) emissions up to standard, eliminate Yan gas Zhong bioxin as far as possible to the pollution of environment, and enter same desulfurizing tower after high-sulfur flue gas and low-sulfur flue gas are shunted and carry out grading desulfurization process, and the traditional approach of full fume treatment is first mixed again relative to high low-sulfur flue gas, desulfurizing tower specification is less, and cost is lower, reduces desulfurizing tower investment and operating cost.
2, apparatus of the present invention arrange quencher, flue-gas temperature will be made by below 250 ~ 450 degree of rapid coolings to 200 degree, the best missing bioxin as far as possible generates temperature, reduce further Yan gas Zhong bioxin generation probability, be conducive to bioxin simultaneously and be adsorbed on flue dust surface in solid form, and primary attachment is on subparticle.
3, select after apparatus of the present invention quencher relative to wet dedusting and the higher sack cleaner of electrostatic precipitation mode efficiency of dust collection, avoid the generation owing to being easily adsorbed in the phenomenon in flue gas on fine particle when bioxin is below 200 degree, efficiency of dust collection can reach 85% ~ 90% or higher, improve bioxin removal efficiency, also can remove and can generate the heavy metal such as copper, iron of catalytic action by Dui bioxin.
4, apparatus of the present invention arrange dechlorination prewashing device after dedusting, remove the chlorion in flue gas to greatest extent, reduce the formation condition of bioxin, also remove other sour gas a large amount of simultaneously, reduce the corrosion to follow-up equipments such as desulfurizing towers.
5, apparatus of the present invention desulfurizing tower exhanst gas outlet is connected with blast-furnace gas diffusing tower by pipeline, flue gas after desulfurization and blast furnace gas mixed combustion, can easily reach more than dew-point temperature to discharge, improve the diffusance of pollutant, flue gas earlier stage treatment process simultaneously before desulfurizing tower eliminates chlorion and the heavy metal such as copper, iron, makes the generation once again avoiding bioxin when burning as far as possible.
6, dust collection method of the present invention simple, be easy to operation, with low cost, good dedusting effect.
Accompanying drawing explanation
Figure l is anatomical connectivity schematic diagram of the present invention;
Fig. 2 is the structure enlarged diagram of eddy flow processing section in Fig. 1;
Fig. 3 is the top view of Fig. 2.
Detailed description of the invention
For accompanying drawing embodiment, the invention will be further described below, and following examples are descriptive, is not determinate, can not limit protection scope of the present invention with this.
A kind of sinter fume shunting grading desulfurization dust-removing device, as shown in Figure 1, described device comprises the bellows group (in figure non-label) of sintering machine, desulfurizing tower 9 and blast-furnace gas diffusing tower 11; The bellows group of described sintering machine is connected with the smoke inlet of desulfurizing tower, the exhanst gas outlet 10 of described desulfurizing tower links together with the entrance of blast-furnace gas diffusing tower, the top of described blast-furnace gas diffusing tower arranges an outlet, arranges a burner 12 outside the blast-furnace gas diffusing tower in this exit.
2 and bellows end 3 is set gradually in the middle part of bellows head end 1, bellows in the bellows group of described sintering machine.
Top in the tower body of described desulfurizing tower arranges exhanst gas outlet, in tower body below exhanst gas outlet, coaxial spaced is provided with liquid storage section 17, first spray section 16, eddy flow processing section 15, second spray section 14 and demist section 13 successively from bottom to top, one circulating pump 18 is set outside desulfurizing tower, described circulation delivery side of pump is linked together with the first spray section and the second spray section respectively by pipeline, and the input of described circulating pump is connected with liquid storage section and is installed together;
In order to strengthen the desulfurization process of low-sulfur flue gas, also there is certain desulfurized effect to high-sulfur flue gas simultaneously, multiple spray section can be set between the second spray section and demist section.
In described liquid storage section, the first smoke inlet 19 is set with the side in the tower body between the first spray section is communicated with, the sidewall in the tower body of described eddy flow processing section with the desulfurizing tower between the second spray section is communicated with the second smoke inlet 8 is set;
Described first smoke inlet successively with the booster fan 20 be arranged at outside desulfurizing tower, first dechlorination prewashing device 21, first air-introduced machine 22, first sack cleaner 23 and the output of the first quencher 24 are connected together, and (the first smoke inlet is connected with the output of booster fan, the input of booster fan is connected with the first output dechlorinating prewashing device, the input of the first dechlorination prewashing device is connected with the output of the first air-introduced machine, the input of the first air-introduced machine is connected with the output of the first sack cleaner, the input of the first sack cleaner is connected with the output of the first quencher), the input of described first quencher is connected with in the middle part of bellows,
Described second smoke inlet successively be arranged at second outside desulfurizing tower and dechlorinate prewashing device 7, second air-introduced machine 6, second sack cleaner 5 is connected together with the output of the second quencher 4, and (the second smoke inlet is connected with the second output dechlorinating prewashing device, the input of the second dechlorination prewashing device is connected with the output of the second air-introduced machine, the input of the second air-introduced machine is connected with the output of the second sack cleaner, the input of the second sack cleaner is connected with the output of the second quencher), the input of described second quencher links together with bellows head end and bellows end respectively,
As shown in Figures 2 and 3, described eddy flow processing section comprises upper sealing panel 25, lower seal plate 26, whirl cylinder 29 and cyclone, between described upper sealing panel and lower seal plate uniform interval seal vertically arrange several vertically, the whirl cylinder of upper and lower opening, hollow, a cyclone is coaxially installed in bottom in described whirl cylinder, described cyclone comprises swirl vane axle 27 and swirl vane 28, swirl vane circularizes arrangement around swirl vane axle, and tilt to be installed on swirl vane axle, swirl vane axle and whirl cylinder are coaxially installed.Swirl vane is the blade construction that propeller type tilts, and its angle of inclination becomes 30-60 degree with axis, and the quantity of this swirl vane can be determined as the case may be, is generally 3 ~ 12, arranges 6 swirl vanes in the present embodiment; Swirl vane can take plane or curve form, and the present embodiment is plane blade.The outer rim co-axial seal of described upper sealing panel and lower seal plate is installed on tower body inwall, and this upper sealing panel and lower seal plate can prevent flue gas short circuit, and by the enclosed cross of the desulfurizing tower tower body beyond whirl cylinder, this shrouding can be welded on whirl cylinder.The quantity of described whirl cylinder can be 10 ~ 100, and in the present embodiment, whirl cylinder for arrange 12 between upper sealing panel and lower seal plate, equally rectangular array, and this whirl cylinder height is 300mm ~ 1000mm.
Utilize sinter fume as above to shunt the dust collection method of grading desulfurization dust-removing device, comprise the steps:
(1) sinter fume enters in the bellows group of sintering machine, high-sulfur flue gas in the middle part of the bellows of bellows group after being arranged on the first quencher between bellows group and desulfurizing tower, the first sack cleaner, the first air-introduced machine, the first dechlorination prewashing device and booster fan, enters in desulfurizing tower from the first smoke inlet of desulfurizing tower successively;
Adopt alkali lye to carry out prewashing to sinter fume in first dechlorination prewashing device, substantially can remove HCl and HF;
(2) the bellows head end of bellows group and the low-sulfur flue gas of bellows end are successively after being arranged on the second quencher between bellows group and desulfurizing tower, the second sack cleaner, the second air-introduced machine and the second dechlorination prewashing device, enter in desulfurizing tower from the second smoke inlet of desulfurizing tower;
Adopt alkali lye to carry out prewashing to sinter fume in second dechlorination prewashing device, substantially can remove HCl and HF;
(3) the spray liquid had in the liquid storage section that desulfurizing tower inner bottom part arranges by the circulating pump that desulfurizing tower is arranged outward pumps into, then spray liquid is sprayed from the first spray section and the second spray section, high-sulfur flue gas is after the first smoke inlet enters desulfurizing tower, desulfurizing agent effect borehole cooling under the first spray section spray also enters eddy flow processing section after partial desulfurization, under cyclone effect, High Rotation Speed upwards, desulfurizing agent high speed rotary-cut under spraying with the second spray section, blending, complete main desulphurization reaction; In space between the second spray section and eddy flow processing section, low-sulfur flue gas, after the second smoke inlet enters desulfurizing tower, mix, and the desulfurization agent under spraying with the second spray section reacts with the high-sulfur flue gas through the backward upper flowing of eddy flow processing section;
If necessary, the 3rd spray section can be set on the second spray section again, strengthen the desulfurization process of low-sulfur flue gas further, also have certain desulfurized effect to high-sulfur flue gas simultaneously;
(4) the high-sulfur flue gas after purification and the mixed flue gas of low-sulfur flue gas enter in demister the drop removed in mixed flue gas, flue gas after demist imports in blast-furnace gas diffusing tower from the exhanst gas outlet of desulfurizing tower through pipeline, after mixing with blast furnace gas in blast-furnace gas diffusing tower, diffuse after the burned device of blast-furnace gas diffusing tower top exit is lighted and enter air.
Dust collection method of the present invention is reduce Yan gas Zhong bioxin further to generate, flue-gas temperature will be made by below 250 ~ 450 DEG C of rapid coolings to 200 DEG C, preferably control at 150 ~ 180 DEG C by the outlet temperature of described first quencher and the second quencher, the present embodiment controls at about 170 DEG C.For the feature that sinter fume is hot and humid, control at 80 ~ 90 DEG C by the outlet temperature of described first dechlorination prewashing device and the second dechlorination prewashing device, the present embodiment controls at 80 DEG C, to reduce the impact of flue gas on desulfurizing tower.After flue gas after described purification mixes with blast furnace gas in blast-furnace gas diffusing tower, through burner combustion, when ensureing to diffuse, flue-gas temperature is greater than dew-point temperature.
In order to remove bioxin as much as possible while desulfurization, dust collection method of the present invention is before flue gas enters desulfurizing tower, take following measure: (1) generates for reducing Yan gas Zhong bioxin further, by flue-gas temperature by below 250 ~ 450 DEG C of rapid coolings to 200 DEG C, miss bioxin the best as far as possible and generate temperature; (when 2) bioxin are below 200 DEG C, easily to be adsorbed in flue gas on fine particle, therefore after quencher, select the sack cleaner (relative to wet dedusting and electrostatic precipitation) that efficiency of dust collection is higher, efficiency of dust collection can reach 85% ~ 90% or higher, maximum possible removal heavy metal, fine dust He bioxin; (3) for removing the chlorion causing bioxin to generate, dechlorination prewashing device being set, alkali lye can be adopted to carry out flue gas prewashing, substantially can remove HCl and HF.(4) purifying smoke after desulfurizing tower process enters blast-furnace gas diffusing tower and blast furnace gas mixed combustion, because dechlorinate before desulfurizing tower link and bag-type dust link eliminate the heavy metal such as copper, iron that bioxin generates the requisite chlorion of institute and play catalytic action, make the generation once again avoiding bioxin during burning as far as possible.
The operation principle of sinter fume shunting grading desulfurization dust-removing device of the present invention is as follows:
According to the feature of sinter fume, general head end bellows flue-gas temperature is lower, the SO of generation 2seldom, middle part box temperature is higher, SO 2concentration is higher, and end bellows flue-gas temperature is high, the SO of generation 2seldom.Usual big-and-middle-sized sintering unit exhausting system is by two air-introduced machine configurations, by first and end bellows flue gas Bing Cheng mono-tunnel, i.e. so-called low-sulfur flue gas, bellows flue gas Bing Cheng mono-tunnel, middle part, i.e. so-called high-sulfur flue gas, according to multiple stage sintering device flue gas measured data, the exhaust gas volumn of high-sulfur and low-sulfur flue gas is more or less the same.Present invention employs two kinds of processing lines: high-sulfur treatment process line and low-sulfur treatment process line.High and low sulphur flue gas is all through quencher, sack cleaner, air-introduced machine and dechlorination prewashing device, and low-sulfur flue gas directly enters desulfurizing tower second smoke inlet afterwards, and high-sulfur flue gas enters desulfurizing tower first smoke inlet after booster fan supercharging.According to two gangs of flue gas SO 2the difference of concentration, high-sulfur flue gas and low-sulfur flue gas enter different smoke inlet and carry out classification process, the two-layer spray process of the common mistake of high-sulfur flue gas and one deck eddy flow processing section intensive treatment, and low-sulfur flue gas is only by the process of one deck spray.Because eddy flow processing section resistance is comparatively large, therefore high-sulfur treatment process line arranges a booster fan more before desulfurizing tower carries out supercharging.High-sulfur flue gas is after the first smoke inlet enters desulfurizing tower, desulfurizing agent effect borehole cooling under the first spray section spray also enters eddy flow processing section after preliminary desulfurization, under cyclone effect, form the swirling eddy upwards with certain speed, desulfurizing agent under second spray section spray is held and rotary-cut repeatedly, the gas-liquid superposed layer that formative dynamics is stable, gas-liquid is poly-loose, blending constantly, completes main desulphurization reaction; In desulfurizing tower between the second spray section and eddy flow processing section, described low-sulfur flue gas is after the second smoke inlet enters desulfurizing tower, mix with the high-sulfur flue gas through the backward upper flowing of eddy flow processing section, and desulfurizing agent under spraying with the second spray section reversely contacts, reaction; Generally, low-sulfur flue gas is through one-level spray desulfurization process, and high-sulfur flue gas have passed through two-stage spray and the process of one-level eddy flow reinforcing desulfuration.Mixed flue gas after purification enters the drop in demister removing flue gas, imports blast-furnace gas diffusing tower and mixes with blast furnace gas, diffuse and enter air after the burned device of blast-furnace gas diffusing tower top exit is lighted from exhanst gas outlet through pipeline.The full fume treatment mode of such classification not only can ensure that whole flue gas can meet desulfurization index request, and first mixes the traditional approach of full fume treatment relative to high low-sulfur flue gas again, and desulfurizing tower specification is less, and cost is lower.

Claims (9)

1. a sinter fume shunting grading desulfurization dust-removing device, described device comprises the bellows group of sintering machine, desulfurizing tower and blast-furnace gas diffusing tower, it is characterized in that: the bellows group of described sintering machine is connected with the smoke inlet of desulfurizing tower, the exhanst gas outlet of described desulfurizing tower and the entrance of blast-furnace gas diffusing tower link together, the top of described blast-furnace gas diffusing tower arranges an outlet, arranges a burner outside the blast-furnace gas diffusing tower in this exit;
Set gradually in the middle part of bellows head end, bellows in the bellows group of described sintering machine and bellows end;
In tower body below described desulfurizing tower exhanst gas outlet, coaxial spaced is provided with liquid storage section, the first spray section, eddy flow processing section, the second spray section and demist section successively from bottom to top, one circulating pump is set outside desulfurizing tower, this circulation delivery side of pump links together with the first spray section and the second spray section respectively, and the input of this circulating pump is connected with liquid storage section and is installed together;
In described liquid storage section, the first smoke inlet is set with the side in the tower body between the first spray section is communicated with, the sidewall in the tower body of described eddy flow processing section with the desulfurizing tower between the second spray section is communicated with the second smoke inlet is set;
Dechlorinate with the booster fan be arranged at outside desulfurizing tower, the first successively output of prewashing device, the first air-introduced machine, the first sack cleaner and the first quencher of described first smoke inlet is connected together, and the input of described first quencher is connected with in the middle part of bellows; Described second smoke inlet successively be arranged at the dechlorinate output of prewashing device, the second air-introduced machine, the second sack cleaner and the second quencher of second outside desulfurizing tower and be connected together, the input of described second quencher links together with bellows head end and bellows end respectively.
2. sinter fume shunting grading desulfurization dust-removing device according to claim 1, is characterized in that: between the second spray section and demist section, arrange multiple spray section.
3. sinter fume shunting grading desulfurization dust-removing device according to claim 1, it is characterized in that: described eddy flow processing section comprises upper sealing panel, lower seal plate, whirl cylinder and cyclone, between described upper sealing panel and lower seal plate uniform interval seal vertically arrange vertically several, upper and lower opening, the whirl cylinder of hollow, a cyclone is coaxially installed in bottom in described whirl cylinder, described cyclone comprises swirl vane axle and swirl vane, swirl vane circularizes arrangement around swirl vane axle, and tilt to be installed on swirl vane axle, swirl vane axle and whirl cylinder are coaxially installed, the outer rim co-axial seal of described upper sealing panel and lower seal plate is installed on tower body inwall.
4. sinter fume shunting grading desulfurization dust-removing device according to claim 3, is characterized in that: described swirl vane is the blade construction that propeller type tilts, and its angle of inclination becomes 30 ~ 60 degree with axis.
5. the sinter fume shunting grading desulfurization dust-removing device according to claim 3 or 4, is characterized in that: the quantity of described swirl vane is 3 ~ 12, and swirl vane takes plane or curve form.
6. the sinter fume shunting grading desulfurization dust-removing device according to claim 3 or 4, it is characterized in that: the quantity of described whirl cylinder is 10 ~ 100, whirl cylinder height is 300mm ~ 1000mm.
7. utilize a dust collection method for the sinter fume shunting grading desulfurization dust-removing device as described in any one of claim 1 to 6, it is characterized in that: comprise the steps:
(1) sinter fume enters in the bellows group of sintering machine, high-sulfur flue gas in the middle part of the bellows of bellows group after being arranged on the first quencher between bellows group and desulfurizing tower, the first sack cleaner, the first air-introduced machine, the first dechlorination prewashing device and booster fan, enters in desulfurizing tower from the first smoke inlet of desulfurizing tower successively;
(2) the bellows head end of bellows group and the low-sulfur flue gas of bellows end are successively after being arranged on the second quencher between bellows group and desulfurizing tower, the second sack cleaner, the second air-introduced machine and the second dechlorination prewashing device, enter in desulfurizing tower from the second smoke inlet of desulfurizing tower;
(3) the spray liquid had in the liquid storage section that desulfurizing tower inner bottom part arranges by the circulating pump that desulfurizing tower is arranged outward pumps into, then spray liquid is sprayed from the first spray section and the second spray section, high-sulfur flue gas is after the first smoke inlet enters desulfurizing tower, desulfurizing agent effect borehole cooling under the first spray section spray also enters eddy flow processing section after partial desulfurization, under cyclone effect, High Rotation Speed upwards, desulfurizing agent high speed rotary-cut under spraying with the second spray section, blending, complete desulphurization reaction; In space between the second spray section and eddy flow processing section, low-sulfur flue gas, after the second smoke inlet enters desulfurizing tower, mix, and the desulfurization agent under spraying with the second spray section reacts with the high-sulfur flue gas through the backward upper flowing of eddy flow processing section;
(4) the high-sulfur flue gas after purification and the mixed flue gas of low-sulfur flue gas enter in demister the drop removed in flue gas, flue gas after demist imports in blast-furnace gas diffusing tower from the exhanst gas outlet of desulfurizing tower through pipeline, after mixing with blast furnace gas in blast-furnace gas diffusing tower, diffuse after the burned device of blast-furnace gas diffusing tower top exit is lighted and enter air.
8. the dust collection method of described sinter fume shunting grading desulfurization dust-removing device according to claim 7, is characterized in that: the outlet temperature of described first quencher and the second quencher controls at 150 ~ 180 DEG C.
9. the dust collection method of described sinter fume shunting grading desulfurization dust-removing device according to claim 7, is characterized in that: the outlet temperature of described first dechlorination prewashing device and the second dechlorination prewashing device controls at 80 ~ 90 DEG C.
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