CN204320059U - A kind of for combining the device that the sulfur-containing tail gas degree of depth reduces discharging - Google Patents
A kind of for combining the device that the sulfur-containing tail gas degree of depth reduces discharging Download PDFInfo
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- CN204320059U CN204320059U CN201420723243.3U CN201420723243U CN204320059U CN 204320059 U CN204320059 U CN 204320059U CN 201420723243 U CN201420723243 U CN 201420723243U CN 204320059 U CN204320059 U CN 204320059U
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- sulfur
- zinc oxide
- tail gas
- hydrogen peroxide
- desulfurization
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- 239000011593 sulfur Substances 0.000 title claims abstract description 52
- 229910052717 sulfur Inorganic materials 0.000 title claims abstract description 52
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 title claims abstract description 40
- 238000007599 discharging Methods 0.000 title claims abstract description 19
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims abstract description 165
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 claims abstract description 84
- 239000011787 zinc oxide Substances 0.000 claims abstract description 82
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 79
- 230000023556 desulfurization Effects 0.000 claims abstract description 67
- 239000007789 gas Substances 0.000 claims abstract description 61
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 60
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 42
- 238000002386 leaching Methods 0.000 claims description 31
- 230000003009 desulfurizing effect Effects 0.000 claims description 19
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 claims description 19
- 229910000368 zinc sulfate Inorganic materials 0.000 claims description 19
- 229960001763 zinc sulfate Drugs 0.000 claims description 18
- 238000010521 absorption reaction Methods 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 9
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 6
- 229910001882 dioxygen Inorganic materials 0.000 claims description 6
- 238000004062 sedimentation Methods 0.000 claims description 5
- 239000002893 slag Substances 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 34
- 238000005516 engineering process Methods 0.000 abstract description 14
- 238000002161 passivation Methods 0.000 abstract description 10
- 150000002978 peroxides Chemical class 0.000 abstract description 10
- HTBDEQQYMMCKQW-UHFFFAOYSA-N [S].OO Chemical compound [S].OO HTBDEQQYMMCKQW-UHFFFAOYSA-N 0.000 abstract description 2
- 229960001296 zinc oxide Drugs 0.000 description 71
- 235000010269 sulphur dioxide Nutrition 0.000 description 34
- HSYFJDYGOJKZCL-UHFFFAOYSA-L zinc;sulfite Chemical compound [Zn+2].[O-]S([O-])=O HSYFJDYGOJKZCL-UHFFFAOYSA-L 0.000 description 15
- 230000009102 absorption Effects 0.000 description 14
- 230000008569 process Effects 0.000 description 11
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 10
- 239000003546 flue gas Substances 0.000 description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 238000001816 cooling Methods 0.000 description 7
- 238000003723 Smelting Methods 0.000 description 6
- 239000011701 zinc Substances 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- 230000003647 oxidation Effects 0.000 description 5
- 238000007254 oxidation reaction Methods 0.000 description 5
- 238000000926 separation method Methods 0.000 description 5
- 239000000779 smoke Substances 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 229910052725 zinc Inorganic materials 0.000 description 5
- 239000002253 acid Substances 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 238000005272 metallurgy Methods 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 239000000428 dust Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 239000004291 sulphur dioxide Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000005868 electrolysis reaction Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000007781 pre-processing Methods 0.000 description 2
- 238000002203 pretreatment Methods 0.000 description 2
- 239000006228 supernatant Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- YLOTYLZFLONZNX-UHFFFAOYSA-N S(=O)=O.OO Chemical compound S(=O)=O.OO YLOTYLZFLONZNX-UHFFFAOYSA-N 0.000 description 1
- 241001062472 Stokellia anisodon Species 0.000 description 1
- -1 ZnSO3 Chemical compound 0.000 description 1
- VDGMIGHRDCJLMN-UHFFFAOYSA-N [Cu].[Co].[Ni] Chemical compound [Cu].[Co].[Ni] VDGMIGHRDCJLMN-UHFFFAOYSA-N 0.000 description 1
- UAOCPXBBRCJOAV-UHFFFAOYSA-N [S].O=S=O Chemical group [S].O=S=O UAOCPXBBRCJOAV-UHFFFAOYSA-N 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 238000007630 basic procedure Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003500 flue dust Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- DLINORNFHVEIFE-UHFFFAOYSA-N hydrogen peroxide;zinc Chemical compound [Zn].OO DLINORNFHVEIFE-UHFFFAOYSA-N 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- JQJCSZOEVBFDKO-UHFFFAOYSA-N lead zinc Chemical compound [Zn].[Pb] JQJCSZOEVBFDKO-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000005453 pelletization Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 235000011149 sulphuric acid Nutrition 0.000 description 1
- 239000001117 sulphuric acid Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
- 229940105296 zinc peroxide Drugs 0.000 description 1
- 239000011686 zinc sulphate Substances 0.000 description 1
- 235000009529 zinc sulphate Nutrition 0.000 description 1
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- Manufacture And Refinement Of Metals (AREA)
- Treating Waste Gases (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
Abstract
The utility model relates to sulfur-containing tail gas and administers and field of environment protection, namely a kind of for combining the device that the sulfur-containing tail gas degree of depth reduces discharging, a kind of device of the method for reducing discharging based on the associating sulfur-containing tail gas degree of depth of zinc oxide method and peroxide passivation specifically, described device comprises pretreatment unit, thick desulfurizer and fine de-sulfur device three part, wherein thick desulfurizer is the device implementing zinc oxide desulfurization technique, removes most of sulfur dioxide in the apparatus; Fine de-sulfur device is the device implementing hydrogen peroxide sulfur removal technology, and carry out fine de-sulfur to tail gas after zinc oxide desulfurization herein, final Sulfur Dioxide Emission Allowances reaches 20mg/Nm
3below, the degree of depth realizing sulfur dioxide reduces discharging, and greatly eliminates ambient influnence.
Description
Technical field
The utility model relates to industry and the environmental technology fields such as iron and steel, metallurgy, nonferrous smelting, chemical industry, a kind of for by based on zinc oxide method and the device of method that reduces discharging of the associating sulfur-containing tail gas degree of depth of combining hydrogen peroxide doctor treatment specifically.
Background technology
Sulfur dioxide is the main pollution factor in atmosphere pollution, and the discharge of sulfur dioxide can cause acid rain to cause acidifying and corrosion to water body, crops, environment, building etc., causes huge economic loss.The high speed development of the industries such as China's iron and steel, metallurgy, nonferrous smelting, chemical industry, bring serious sulfur dioxide pollution, carrying capacity of environment is difficult to bear, and the discharge standard of every profession and trade tightened step by step in recent years, bring restriction to the development of every profession and trade, the degree of depth of sulfur dioxide reduces discharging extremely urgent.
Existing sulfur removal technology is of a great variety, all have some limitations, its subject matter adopts a certain sulfur removal technology technology effectively can not realize the efficient degree of depth to reduce discharging, can not ensure the requirement of the national standard that every profession and trade is up-to-date and regional discharge standard, and single sulfur removal technology well can not ensure economy.
Existing zinc oxide desulfurization technique, for there being the Lead-zinc Smelting Enterprises of oxidation zinc resource, what adopt roasting to produce contains zinc-oxide calcine or flue dust, what add water and be modulated into reacts containing the sulfur dioxide in zinc oxide slip and flue gas, after sulfur dioxide absorption, reaction of formation thing is zinc sulfite, zinc sulfate, there is the unreacted zinc oxide of part simultaneously.Its basic procedure is: first prepare the slip containing zinc oxide material, and sulfur-containing tail gas, after the pretreatment such as cooling dedusting reach technological requirement, enters in zinc oxide desulfurization tower, through generating zinc sulfite and zinc sulfate containing zinc oxide slip spray-absorption sulfur dioxide; Loop slurry part open circuit goes out the slip of the higher concentration containing zinc sulfite, zinc sulfate and zinc oxide through sedimentation separation, be delivered to acidifying leaching section, finally obtains zinc sulfate slip by adding dilute sulfuric acid leaching; The supernatant of circulation fluid sedimentation separation is delivered to surge tank, adds containing zinc oxide material, continues to be modulated into containing zinc oxide slip, for the no-load loss of replenishment cycles slip, maintains ability and the efficiency of circulation slip sulfur dioxide absorption all the time.Tail gas after zinc peroxide slip absorbs, sulfur dioxide concentration generally can control be not more than 400mg/Nm
3, emptying through chimney.In current sulfuric acid industry pollutant emission standard GB26132-2010, sulfur dioxide (SO2) emissions limit value is general regional 400mg/Nm
3, developed regions 200mg/Nm
3; In plumbous Zn Cr coating, copper cobalt nickel emission of industrial pollutants standard GB25467-2010, sulfur dioxide (SO2) emissions limit value is 400mg/Nm
3; In steel sintering, pelletizing industrial air pollution thing discharge standard GB28662-2012, sulfur dioxide (SO2) emissions limit value is 200mg/Nm
3; Indivedual key area performs 100mg/Nm
3, even 50mg/Nm
3limit value, to the environmental protection of enterprise management strict demand is provided.
The important defect of zinc oxide desulfurization is that desulfuration efficiency is limited, in general, even if when depth optimization, also can only reach the desulfuration efficiency of about 90%; And because be the zinc oxide slip circulated in sweetening process, product is also the solidliquid mixture containing zinc sulfite etc., easily causes the blockage problem of pipeline, equipment, then has influence on again the normal operation of absorption efficiency and system.The slip containing zinc sulfite, zinc sulfate, zinc oxide that desulfurization produces additionally need add sulfuric acid and carry out acidifying leaching, increases desulfurization consuming cost.In today of current environmental requirement increasingly stringent, merely with this kind of method overall operation situation and less effective.Chinese patent application 201110323907.8 discloses a kind of Zinc oxide desulfuration technology, to some extent solves the problem of line clogging, but does not still solve the problem of desulfuration efficiency.
Hydrogen peroxide desulfurization is current emerging another kind of doctor treatment, and principle utilizes the strong oxidizing property of hydrogen peroxide to make sulfur dioxide be direct oxidation into sulfuric acid.This reaction is Strong oxdiative reaction, is swift in response and thoroughly, desulfuration efficiency is high.Deep desulfuration reduction of discharging can be carried out to the tail gas of zinc oxide desulfurization, the dilute sulfuric acid generated is transported to acidifying leaching section as the raw material containing zinc sulfite, zinc sulfate and zinc oxide leaching zinc oxide discharge, save a large amount of acidifying leaching sulfuric acid dosage, realize comprehensive utilization.And peroxide passivation desulfuration efficiency is high, effective, flue gas after desulfurization sulfur dioxide can be reduced to 20mg/Nm
3below.But when industrial smoke, because exhaust gas volumn is large, sulfur content is air mass distribution, and sulfur-containing smoke gas and hydrogen peroxide react acutely, so simple hydrogen peroxide desulfurization has certain safety issue.
Utility model content
The purpose of this utility model is to provide a kind of for based on zinc oxide method and the device of method that reduces discharging of the sulfur-containing tail gas degree of depth of combining peroxide passivation, in the method, first the pretreatment such as cooling dedusting are carried out to sulfur-containing tail gas, then adopt Zinc oxide desulfuration technology to carry out thick desulfurization, finally adopt peroxide passivation sulfur removal technology to carry out fine de-sulfur.After deep desulfuration technique, in sulfur-containing tail gas, sulfur dioxide sulfur-bearing can be reduced to 20mg/Nm
3below, the requirement of existing every profession and trade discharging standards limit value is met.
Specifically, the technical solution adopted in the utility model is as follows:
For combining the device that the sulfur-containing tail gas degree of depth reduces discharging, described device comprises pretreatment unit, thick desulfurizer and fine de-sulfur device, and pretreatment unit comprises deduster and cooler; Thick desulfurizer comprises zinc oxide desulfurization tower, subsider, zinc oxide surge tank and acidifying leaching tanks; And fine de-sulfur device comprises hydrogen peroxide desulfurizing tower and dioxygen tank, it is characterized in that, the gas output tube line of zinc oxide desulfurization tower is connected directly to the charging aperture of hydrogen peroxide desulfurizing tower, the slag notch of zinc oxide desulfurization tower is connected to subsider, clear liquid through sedimentation exports the zinc oxide absorption material of zinc oxide surge tank for supplementary zinc oxide desulfurizing tower to, the pulpous state slag that subsider gets off enters acidifying leaching tanks, also has one for the dilute sulfuric acid generated in hydrogen peroxide desulfurizing tower being transported to the pipeline of acidifying leaching tanks between hydrogen peroxide desulfurizing tower and acidifying leaching tanks.
As further preferred embodiment, described device also comprises a feed-line after acidifying leaching tanks, and the sulfur dioxide for being produced after zinc sulfate reclaims by leaching section product is transported to hydrogen peroxide desulfurizing tower to carry out being oxidized or absorbing.
Beneficial effect: compared with the device of device of the present utility model and existing simple zinc oxide method or peroxide passivation, have desulfuration efficiency high, can realize that the degree of depth reduces discharging, the dilute sulfuric acid that generates is directly used in and leaches thick desulfurization containing zinc, integrated operation low cost and other advantages.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of combined desulfurization device of the present utility model.
In the drawings: 1 deduster; 2 coolers; 3 zinc oxide desulfurization towers; 4 zinc oxide desulfurization pumps; 5 subsiders; 6 zinc oxide surge tanks; 7 acidifying leaching tanks; 8 leach pump; 9 hydrogen peroxide desulfur pumps; 10 hydrogen peroxide desulfurizing towers; 11 dioxygen water pumps; 12 dioxygen tanks; 13 sulfur-containing smoke gas; 14 temperature lowering waters; 15 sulfur-containing smoke gas; 16 containing zinc-oxide calcine; 17 ZnO, ZnSO3, ZnSO4; 18 zinc electrolysis workshop sections; 19 dilute sulfuric acids; 20 SO2; 21 tail gas are emptying; 22 water; I pre-treatment step; The thick desulfurized step of II; III fine de-sulfur step.
Detailed description of the invention
The utility model is by adopting the thick desulfurization of zinc oxide method and peroxide passivation fine de-sulfur process integration to through pretreated tail gas, overcome desulfuration efficiency in existing zinc oxide desulfurization technology lower, need supplementary sulfuric acid leaching to discharge containing the problem such as zinc sulfite, zinc oxide slip, sulfur-containing tail gas through the thick desulfurization of zinc oxide method is adopted the further efficient removal of peroxide passivation sulfur removal technology again, and the self-produced dilute sulfuric acid of Appropriate application.
The method that the sulfur-containing tail gas degree of depth that the utility model device is applied reduces discharging comprises the following steps:
First, sulfur-containing tail gas (as industries such as iron and steel, metallurgy, nonferrous smelting, chemical industry) is first taked to the pretreatment measures such as cooling dedusting, its temperature is down to and is less than 160 DEG C, dustiness is less than 50mg/Nm
3, meet zinc oxide desulfurization technological requirement.When sulfur-containing tail gas is not treated directly meet zinc oxide desulfurization technological requirement time, this step can be save.
Secondly, be raw material to adopting containing zinc oxide slip through pretreated sulfur-containing tail gas, carry out absorption process, in gas, sulfur dioxide and zinc oxide generate the slip containing zinc sulfite, zinc sulfate and zinc oxide after reacting, and obtain containing zinc sulfite, zinc sulfate and zinc oxide slip to acidifying leaching section after sedimentation separation.After zinc oxide desulfurization, the content of sulfur dioxide in tail gas is reduced.Adopt method of the present utility model, this step only needs thick desulfurization, that is the effect of this step can be regarded as and relates to two aspects, desulfidation on the one hand, owing to there being follow-up fine de-sulfur effect, this step does not need to reach low-down sulfur content, and in general, the sulfur content after the thick desulfurized step of the utility model in tail gas can reach 2000-3000 mg/Nm
3, preferred 400-800mg/Nm
3, can certainly control lower, such as, be less than 400mg/Nm
3.On the other hand, owing to greatly reducing the requirement of this step, make all greatly to reduce the requirement of each side such as equipment, process control and desulfurization zinc oxide material, operation cost obtains very large reduction compared to present zinc oxide desulfurization.
Then, low containing SO 2 tail gas by after zinc oxide desulfurization, then adopt hydrogen peroxide to absorb sulfur dioxide wherein, carry out desulfurization again, after desulfurization, tail gas sulphur dioxide is less than 20mg/Nm
3, the dilute sulfuric acid conveying that desulfurization produces is used for the leaching containing zinc sulfite, zinc oxide slip of thick desulfurization discharge.In the utility model, the charging of hydrogen peroxide desulfurizing tower have passed through thick desulfurization process, sulfur content reduces, and sulfur content obtains adjustment to a certain degree in the tail gas of different section, sulfur content becomes smoother, the operation of hydrogen peroxide desulfurization is very steady, eliminates potential safety hazard, and can realize very high desulfurization degree easily.
Pretreatment wherein containing SO 2 tail gas comprises the following steps:
Step I: cooling, containing SO 2 tail gas can adopt surface-cooler or air cooling heat exchanger or directly the measure such as water spray hybrid cooling realize gas temperature and be reduced to and be less than less than 160 DEG C.
Step II: dedusting, after step I, tail gas realizes the removal of dust-laden material in gas through the measure such as sack cleaner or electric cleaner.
Containing the zinc oxide desulfurization technique that the thick desulfurization of SO 2 tail gas adopts, can be chosen one or more levels according to the sulfur-bearing of sulfur dioxide in tail gas and absorb flow process.
Tail gas after the thick desulfurization of zinc oxide method adopts hydrogen peroxide to carry out fine desulfurizing technology desulfurization again, can choose tower and the absorption equipment of stuffing washing tower or the form such as void tower or hypergravity machine according to sulfur dioxide in tail gas content.
The device that the method that the utility model sulfur-containing tail gas degree of depth reduces discharging adopts comprises gas preprocessing part, zinc oxide desulfurization part, hydrogen peroxide disengagement section, three some processes methods and device organic assembling, realizes the sulfur-containing tail gas degree of depth and reduces discharging.
The dilute sulfuric acid byproduct produced in peroxide passivation fine de-sulfur part, directly can be used as the leaching containing zinc sulfite, zinc oxide slip of thick desulfurization discharge; Also can be delivered to production system reuse, do process adjustments water as gas washing in SA production dry absorption section can be back to; Also directly as by-product sale, or can sell after being concentrated into finished acid.
On the other hand, the product produced in the Ore Leaching workshop section of zinc oxide desulfurization is after zinc sulfate reclaims, the sulfur dioxide gas discharged can be directly used in relieving haperacidity, or the charging as hydrogen peroxide sulfur dioxide desulfurization is carried out being oxidized or absorbing, the sulfuric acid produced can turn back to Ore Leaching again, thus realize the benign cycle of material, considerably reduce the consumption of material.Through such circulation, greatly reduce outside interpolation acid.
The utility model is compared with existing simple zinc oxide desulfurization technique, and have the following advantages: 1. desulfuration efficiency is high, the content of sulfur dioxide in tail gas is less than 20mg/Nm
3, thus realize degree of depth reduction of discharging; 2. the dilute sulfuric acid that fine de-sulfur produces directly can be used as the leaching acid of thick desulfurization discharge containing zinc sulfite, zinc oxide slip, saves to leach supplementary sour, and leaches that accessory substance directly carries out producing acid by oxidation and without the need to setting up treatment process in addition, realization fully utilizes; 3., owing to adopting this combined desulfurization, the requirement of zinc oxide desulfurization workshop section is reduced, only needs to reach 400mg/Nm
3to 800mg/Nm
3, even 2000 mg/Nm
3to 3000 mg/Nm
3index, equipment cost and operating cost significantly reduce; 4. the content through the sulfur dioxide in tail gas of thick desulfurization reduces, and owing to have passed through first processing procedure, the content distribution of sulfur dioxide obtains adjustment, and the reacting balance in hydrogen peroxide desulfurizing tower, makes security be improved; 5., compared to prior art, integrated operation cost is lower, and synthesis desulfurating effect significantly improves.
Below in conjunction with accompanying drawing and example, the utility model is further illustrated.
Fig. 1 is device flow chart of the present utility model, has schematically marked three processing sections in FIG: preprocessing part I(lowers the temperature dedusting), thick disengagement section II and fine de-sulfur part III.
Pre-treatment step comprises sulfur-containing tail gas 13(as industries such as iron and steel, metallurgy, nonferrous smelting, chemical industry) first through deduster 1 and cooler 2 etc., take cooling, dust suppression, makes its temperature be down to and is less than 160 DEG C, and dustiness is less than 50mg/Nm
3, meet zinc oxide desulfurization technological requirement.When sulfur-containing tail gas is not treated directly meet zinc oxide desulfurization technological requirement time, this step can be save.
Thick disengagement section and zinc oxide desulfurization part, be raw material to adopting containing zinc oxide slip through pretreated sulfur-containing tail gas 15 in zinc oxide desulfurization tower 3, carry out absorptions and process, in gas, sulfur dioxide and zinc oxide generate zinc sulfite, zinc sulfate after reacting.Product is pumped into subsider 5 through zinc oxide desulfurization pump 4, obtains containing zinc sulfite, zinc oxide, zinc sulfate slip 17 after treated separation.Supernatant layer after separation is sent to zinc oxide surge tank 6, then the zinc oxide that replenish lost is fallen, and is again modulated into absorption materials, is input to zinc oxide desulfurization tower 3.Slag charge is sent to acidifying leaching tanks 7, adds sulfuric acid and reacts.The zinc sulfate produced after leaching is pumped into back segment treatment process 18, such as zinc sulfate recovery, electrolysis zinc etc. through leaching pump 8.And the sulfur dioxide 20 generated can be transported to hydrogen peroxide desulfurizing tower 10 as part charging, the sulfur dioxide of release is made sulfuric acid.After zinc oxide desulfurization, tail gas sulphur dioxide controls to be less than 800mg/Nm
3, be goodly less than 400mg/Nm
3.。
Fine de-sulfur part and hydrogen peroxide disengagement section, low containing SO 2 tail gas by after thick for zinc oxide method desulfurization, be pumped into hydrogen peroxide desulfurizing tower 10 through hydrogen peroxide desulfur pump 9 and carry out desulfurization again by hydrogen peroxide sulfur removal technology, after desulfurization, tail gas 21 sulfur dioxide is less than 20mg/Nm
3.The sulfuric acid 19 produced after desulfurization can as commodity selling, or concentrated after as commodity selling, or as the absorption water in acid-making process.In the utility model, the sulfuric acid generated is sent to the Ore Leaching workshop section of thick desulfurization stage.In hydrogen peroxide desulfurizing tower 10 supply of hydrogen peroxide by dioxygen water pump 11 from the pumping of dioxygen tank.
Specific embodiment:
Certain non-ferrous smelt enterprise, the former flue gas of sulfur-bearing is plumbous smelting zinc oxide fuming furnace flue gas, gas flow 120000m
3/ h, flue-gas temperature 200 DEG C, SO 2 from fume 8000mg/Nm
3, dust-laden 200mg/Nm
3.Enter surface-cooler naturally to cool, flue-gas temperature is reduced to 150-160 DEG C, is then separated dust through sack cleaner, reduces dust to 50mg/Nm
3below; Then sulfur-containing smoke gas enters one-level, secondary, three grades of absorption towers successively, with zinc oxide slurry solution, cyclic absorption is carried out to sulfur dioxide in flue gas, the zinc sulfite slurries that reaction generates, drain in oxidation furnaces and adopt drum air oxidation to be zinc sulfate slurries, zinc sulfate slurries, after concentrated, adopt centrifuge to be separated and obtain zinc sulfate crystallization.
Tail gas 120000Nm after zinc oxide desulfurization
3/ h(butt), containing sulfur dioxide 700mg/Nm
3, flue-gas temperature 38 DEG C, moisture content 5%; Flue gas enters in peroxide passivation absorption tower, and with the sulfur dioxide absorbed containing hydrogen peroxide liquid-circulating in flue gas, reaction generation 12% dilute sulfuric acid, part is delivered to the dry absorption section in zinc abstraction Sulphuric acid workshop, and part is transported to the acidifying leaching section of zinc oxide desulfurization.
After peroxide passivation desulfurization, tail gas sulphur dioxide is less than 20mg/Nm
3, emptying through emptying chimney.
With specific embodiment, embodiment of the present utility model is described in detail by reference to the accompanying drawings above, but the utility model is not limited to above-mentioned embodiment, in the ken that art those of ordinary skill possesses, can also make a variety of changes under the prerequisite not departing from the utility model aim.
Claims (2)
1., for combining the device that the sulfur-containing tail gas degree of depth reduces discharging, described device comprises pretreatment unit, thick desulfurizer and fine de-sulfur device, and pretreatment unit comprises deduster and cooler; Thick desulfurizer comprises zinc oxide desulfurization tower, subsider, zinc oxide surge tank and acidifying leaching tanks; And fine de-sulfur device comprises hydrogen peroxide desulfurizing tower and dioxygen tank, it is characterized in that, the gas output tube line of zinc oxide desulfurization tower is connected directly to the charging aperture of hydrogen peroxide desulfurizing tower, the slag notch of zinc oxide desulfurization tower is connected to subsider, clear liquid through sedimentation exports the zinc oxide absorption material of zinc oxide surge tank for supplementary zinc oxide desulfurizing tower to, the pulpous state slag that subsider gets off enters acidifying leaching tanks, also has one for the dilute sulfuric acid generated in hydrogen peroxide desulfurizing tower being transported to the pipeline of acidifying leaching tanks between hydrogen peroxide desulfurizing tower and acidifying leaching tanks.
2. as claimed in claim 1 for combining the device that the sulfur-containing tail gas degree of depth reduces discharging, it is characterized in that, described device also comprises a feed-line after acidifying leaching tanks, and the sulfur dioxide for being produced after zinc sulfate reclaims by leaching section product is transported to hydrogen peroxide desulfurizing tower to carry out being oxidized or absorbing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420723243.3U CN204320059U (en) | 2014-11-27 | 2014-11-27 | A kind of for combining the device that the sulfur-containing tail gas degree of depth reduces discharging |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420723243.3U CN204320059U (en) | 2014-11-27 | 2014-11-27 | A kind of for combining the device that the sulfur-containing tail gas degree of depth reduces discharging |
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| Publication Number | Publication Date |
|---|---|
| CN204320059U true CN204320059U (en) | 2015-05-13 |
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| CN201420723243.3U Expired - Fee Related CN204320059U (en) | 2014-11-27 | 2014-11-27 | A kind of for combining the device that the sulfur-containing tail gas degree of depth reduces discharging |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104548898A (en) * | 2014-11-27 | 2015-04-29 | 南京澄天环境科学研究院有限公司 | Method and device for combining deep emission reduction of sulfur-containing tail gas |
| CN107754596A (en) * | 2016-08-19 | 2018-03-06 | 张丽媛 | Roaster calcining discharge system gathers dust the recycling technique of sulfur dioxide in gas |
| CN109179485A (en) * | 2018-11-13 | 2019-01-11 | 常宁市华兴冶化实业有限责任公司 | A method of it emulsifying zinc oxide desulfurization and prepares zinc sulfate |
-
2014
- 2014-11-27 CN CN201420723243.3U patent/CN204320059U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104548898A (en) * | 2014-11-27 | 2015-04-29 | 南京澄天环境科学研究院有限公司 | Method and device for combining deep emission reduction of sulfur-containing tail gas |
| CN107754596A (en) * | 2016-08-19 | 2018-03-06 | 张丽媛 | Roaster calcining discharge system gathers dust the recycling technique of sulfur dioxide in gas |
| CN109179485A (en) * | 2018-11-13 | 2019-01-11 | 常宁市华兴冶化实业有限责任公司 | A method of it emulsifying zinc oxide desulfurization and prepares zinc sulfate |
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