CN104148013A - Preparation method for flue gas mercury-removing active carbon - Google Patents
Preparation method for flue gas mercury-removing active carbon Download PDFInfo
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- CN104148013A CN104148013A CN201410346222.9A CN201410346222A CN104148013A CN 104148013 A CN104148013 A CN 104148013A CN 201410346222 A CN201410346222 A CN 201410346222A CN 104148013 A CN104148013 A CN 104148013A
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- active carbon
- mercury
- halogen
- halide salt
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 125
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 94
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title abstract description 15
- 239000003546 flue gas Substances 0.000 title abstract description 15
- 229910052736 halogen Inorganic materials 0.000 claims abstract description 46
- 150000002367 halogens Chemical class 0.000 claims abstract description 45
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 39
- -1 halide salt Chemical class 0.000 claims abstract description 26
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 24
- 239000002994 raw material Substances 0.000 claims abstract description 18
- 239000000243 solution Substances 0.000 claims abstract description 17
- 150000004820 halides Chemical class 0.000 claims abstract description 9
- 239000012266 salt solution Substances 0.000 claims abstract description 9
- 238000005406 washing Methods 0.000 claims abstract description 8
- 238000001035 drying Methods 0.000 claims abstract description 7
- 238000001914 filtration Methods 0.000 claims abstract description 6
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 claims description 101
- 229910052753 mercury Inorganic materials 0.000 claims description 94
- 238000001179 sorption measurement Methods 0.000 claims description 23
- 239000003517 fume Substances 0.000 claims description 22
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 claims description 16
- 229910052794 bromium Inorganic materials 0.000 claims description 16
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 claims description 15
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 13
- 229910052801 chlorine Inorganic materials 0.000 claims description 13
- 239000000460 chlorine Substances 0.000 claims description 13
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical class [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 12
- 230000000694 effects Effects 0.000 claims description 11
- 238000007598 dipping method Methods 0.000 claims description 8
- 239000001103 potassium chloride Substances 0.000 claims description 5
- 235000011164 potassium chloride Nutrition 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- PNDPGZBMCMUPRI-UHFFFAOYSA-N iodine Chemical compound II PNDPGZBMCMUPRI-UHFFFAOYSA-N 0.000 claims description 4
- 239000003570 air Substances 0.000 claims description 2
- 238000001802 infusion Methods 0.000 claims description 2
- 238000012545 processing Methods 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 abstract description 4
- 238000011068 loading method Methods 0.000 abstract description 4
- 239000002245 particle Substances 0.000 abstract description 3
- 238000011049 filling Methods 0.000 abstract 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract 1
- 125000003636 chemical group Chemical group 0.000 abstract 1
- 238000002156 mixing Methods 0.000 abstract 1
- 229910052760 oxygen Inorganic materials 0.000 abstract 1
- 239000001301 oxygen Substances 0.000 abstract 1
- 239000003245 coal Substances 0.000 description 13
- IOLCXVTUBQKXJR-UHFFFAOYSA-M potassium bromide Chemical class [K+].[Br-] IOLCXVTUBQKXJR-UHFFFAOYSA-M 0.000 description 12
- 239000007789 gas Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 235000013162 Cocos nucifera Nutrition 0.000 description 6
- 244000060011 Cocos nucifera Species 0.000 description 6
- 238000010521 absorption reaction Methods 0.000 description 6
- 239000010903 husk Substances 0.000 description 5
- 239000011148 porous material Substances 0.000 description 5
- 239000002585 base Substances 0.000 description 4
- 239000003610 charcoal Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 229910052740 iodine Inorganic materials 0.000 description 4
- 239000011630 iodine Substances 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 3
- LBVGBJMIMFRUSV-UHFFFAOYSA-N [C].[Hg] Chemical compound [C].[Hg] LBVGBJMIMFRUSV-UHFFFAOYSA-N 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 238000006555 catalytic reaction Methods 0.000 description 2
- 238000012512 characterization method Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- ORTQZVOHEJQUHG-UHFFFAOYSA-L copper(II) chloride Chemical compound Cl[Cu]Cl ORTQZVOHEJQUHG-UHFFFAOYSA-L 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- XMBWDFGMSWQBCA-UHFFFAOYSA-N hydrogen iodide Chemical compound I XMBWDFGMSWQBCA-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000012808 vapor phase Substances 0.000 description 2
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 description 2
- 239000005864 Sulphur Substances 0.000 description 1
- GPWHDDKQSYOYBF-UHFFFAOYSA-N ac1l2u0q Chemical compound Br[Br-]Br GPWHDDKQSYOYBF-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010882 bottom ash Substances 0.000 description 1
- GZUXJHMPEANEGY-UHFFFAOYSA-N bromomethane Chemical compound BrC GZUXJHMPEANEGY-UHFFFAOYSA-N 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- NEHMKBQYUWJMIP-UHFFFAOYSA-N chloromethane Chemical compound ClC NEHMKBQYUWJMIP-UHFFFAOYSA-N 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 229960003280 cupric chloride Drugs 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000012717 electrostatic precipitator Substances 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- INQOMBQAUSQDDS-UHFFFAOYSA-N iodomethane Chemical compound IC INQOMBQAUSQDDS-UHFFFAOYSA-N 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229940100892 mercury compound Drugs 0.000 description 1
- 150000002731 mercury compounds Chemical class 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
- 239000011592 zinc chloride Substances 0.000 description 1
- 235000005074 zinc chloride Nutrition 0.000 description 1
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- Treating Waste Gases (AREA)
Abstract
The invention provides a preparation method for flue gas mercury-removing active carbon. The preparation method comprises the following steps: step 1, removing a surface chemical group of a raw material: washing the particle active raw material with 10.wt%-30.wt% NaOH solution and drying the raw materials at 100-120 DEG C; step 2, immersing halide salt: mixing, immersing and agitating the raw material active carbon with an oxygen-containing group on the surface and a halide salt solution according to the mass ratio ranging from 1:1 to 1:5 for 4-12 hours; filtering and drying to obtain active carbon carrying the halide salt, wherein the concentration of the halide salt solution is 10wt.%-50wt.%; step 3, loading halogen: putting the active carbon carrying the halide salt into a U-shaped pipe to form a filling layer; inputting air with the halogen from the top of the filling layer at the speed of 100-500mL/min and keeping the heat for 1-10 hours at room temperature to obtain saturated halogen-loaded active carbon; and step 4, heating the saturated halogen-loaded active carbon at the temperature in a range of 80-120 DEG C to remove the volatile halogen to prepare the flue gas mercury-removing active carbon.
Description
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Technical field
The invention belongs to fume mercury-removing activated carbon technology field, relate in particular to the preparation method of high effective flue gas removal of mercury active carbon.
Background technology
Coal will remain the main energy sources of electric power in future, the coal-fired flue-gas mercury pollution causing thus has become another the global Significant Problems of Eco-environment after climate change.In coal fire discharged thing, mercury compound, sulfur dioxide dust are also the main causes that PM2.5 forms, and are the roots that causes haze weather.At present, coal in China consumption ranks first in the world, and still accounts for 72% to the year two thousand twenty CHINESE COAL electricity, needs coal-fired approximately 2,700,000,000 tons, estimates 2035, and the supply of electric power in the whole world 43% is still from coal.In coal-fired process, mercury evaporation also enters atmosphere with flue gas, and enter ecological recycle system by precipitation.Although the not high (n × l0 of the mercury content in coal
-7the order of magnitude), but the consumption figure of whole world coal is very huge, causes thus mercury emission very large.Jiang Jingkun [Jiang Jingkun, Hao Jiming, Wu Ye, Deng. the preliminary foundation [J] of Coal Combustion in China mercury emissions inventory. environmental science, 2005,26 (2): 35-39.] etc. estimation China's coal-fired flue-gas mercury emission in 2000 is 219.5 tons, and wherein electric power discharge capacity accounts for 35%, Mercury Emissions from Coal-Fired Boilers amount has exceeded the U.S., and atmosphere and soil environment have been caused to severe contamination.Therefore, the whole world increases severely year by year to the demand of fume mercury-removing active carbon.
Mercury in coal-fired flue-gas is mainly with simple substance state mercury (Hg
0), particle mercury (Hg
p) and oxidation state mercury (Hg
2+) 3 kinds of forms exist, and under certain condition, in flue gas, the mercury of three kinds of forms can transform mutually.In coal, most mercury is discharged into atmosphere in combustion process, remains in very few (being less than 2%) of mercury in bottom ash.Particle mercury can utilize cleaner to collect and remove, and oxidation state mercury can be removed with wet desulphurization equipment.But Elemental Mercury fusing point low (38.9 DEG C), vapour pressure high (25 DEG C time 0.25Pa), poorly water-soluble (25 DEG C time 600 μ g/L), be difficult to utilize existing pollutant control appliance effectively to remove, harm is large, becomes in mercury pollution control tool challenge and be also the technology that solves be badly in need of.
Research shows, active carbon produces effect at the oxidation state mercury removing in flue gas at present, but is not very desirable for Elemental Mercury removal efficiency.USDOE estimates, is 90 % if reach demercuration rate, and the cost that removes 0.45 kg mercury is (2.5-7.0) × 10
4dollar, so expensive cost, coal-burning power plant is difficult to bear, and active carbon is promoted very difficult in commercial applications, and by add additive in active carbon, this modified activated carbon significantly strengthens the absorption property of mercury, can significantly reduce active carbon demercuration cost.
[Dong Yong, explains quickly Dong Yong etc., and Wang Peng, etc. CaCl
2add the experimental study [J] on mercury Precipitation Behavior impact in pyrolyzing coal. chemistry of fuel journal, 2014,42 (01): 31-36] study the CaCl that adds different chlorinities (mass fraction 0.1%, 0.3%, 0.5%) in low chlorine coal
2on the impact of mercury Precipitation Behavior in pyrolysis of coal process.Experimental result shows, temperature is to affect the key factor that mercury is separated out; Along with the increase of chlorine addition, Hg
2+separate out ratio in rising trend; [the Li X such as Li, Liu Z, Kim J, et al. Heterogeneous catalytic reaction of elemental mercury vapor over cupric chloride for mercury emissions control[J]. Applied catalysis B:environmental, 2013,132:401-407.] use 1 % and 5 % zinc chloride to process active carbon, the active carbon mercury adsorption capacity after modification is respectively 5.5 times and 9 times of original activity charcoal; Deng Xianlun etc. [Deng Xianlun, Jiang Jianchun. Development of S-loaded Activated Carbon Applied To Remove Mercury [J]. forest chemical engineering communication, 2004,38 (3): 13-16.] active carbon is mixed to sulphur modification after its demercuration rate reach 99 %; [Tian L H, Li C T, Li Q, the et a1. Removal of elemental mercury by activated carbon impregnated with CeO such as Tian
2[J]. Fuel, 2009,88 (9): 1687-1691.] prepare load C eO
2active carbon, when load capacity is brought up to 80 % to mercury clearance from 30 % in 120 min during at 1 %-3 %.U.S. PSCo/ADA[Vidic, R D, Chang M T, Thurnau R C, Kinetics of vapor-phase mercury uptake by virgin and sulfur impregnated activated carbons[J]. J. air and waste, 2005,48:247-255.] carry out field trial in power station with industrial activited carbon, result shows: carbon mercury (C/Hg) than when the 5000:1 in ESP(electrostatic precipitator) outlet sprays into active carbon, its removal of mercury efficiency is 45%.Wang Li has just waited [adsorpting characteristic of flying dust carbon residue to nonvalent mercury steam] to study flying dust and do not fire the characterization of adsorption of carbon residue to nonvalent mercury steam. at low mercury equilibrium concentration (<250ug/m
3) under condition, carbon residue mercury adsorption capacity and business active carbon gap are not remarkable, business active carbon obviously raises in the mercury adsorbance of high mercury concentration end, and carbon residue mercury characterization of adsorption and its source correlation are stronger.
In sum, the existing research of fume mercury-removing active carbon, but exist removal of mercury rate not high, mercury capacity is only 1 ‰~10% left and right, especially little to the adsorption capacity of Elemental Mercury, causes application cost high, the problems such as commercial applications difficulty.It is raw material that the present invention selects the commercial active carbon that microporosity is high, first load halogenated alkali metal salt, then use vapor phase method load halogen, and form stable complex salt, finally at high temperature remove volatilizable halogen, make high effective flue gas removal of mercury active carbon.The method is easy to operate, and the active carbon mercury capacity of preparing, up to 150%, has significantly reduced use cost, is easy to commercialization and promotes
Summary of the invention
the technical problem solving:low in order to solve existing fume mercury-removing adsorbent mercury saturated adsorption capacity, the shortcomings such as the easy secondary of mercury comes off, make full use of the chemisorbed that gaseous elementary mercury forms physical absorption and forms with bromine in micropore, the invention provides a kind of preparation method of fume mercury-removing active carbon, preparation technology is convenient, product mercury removal performance is good, does not produce secondary pollution, is easy to the features such as commercialization.
technical scheme:the preparation method of fume mercury-removing active carbon, comprises the steps: the first step, and raw material is removed surface chemistry group: by 100-200 DEG C of oven dry after the NaOH solution washing of 10 wt. %~30 wt.% for seed activity carbon feedstock; Second step, dipping halide salt: raw material active carbon and the halide salt solution of removing surperficial oxy radical are carried out to hybrid infusion stirring 4 ~ 12 hours according to the mass ratio of 1:1~1:5, filtration drying, obtains being loaded with the active carbon of halide salt, and the concentration of described halide salt solution is 10 wt.%~50 wt. %; The 3rd step, load halogen: the active carbon that is loaded with halide salt, as in U-shaped pipe, is formed to packed layer, inputted by packed layer top with 100-500mL/min band halogen air, maintain 1~10h under room temperature, obtain the active carbon of saturated load halogen; The 4th step adds the active carbon of saturated load halogen the volatilizable halogen of heat abstraction at 80~120 DEG C, prepares fume mercury-removing active carbon.
Solution described in the first step is NaOH solution, and concentration is 30 wt.%.
In second step, halide salt is the one in potassium chloride, KBr, KI, and halide salt solution concentration is 15wt.%.
In the 3rd step, halogen is the one in chlorine, bromine, iodine, air mass flow 300 mL/min.
In the 4th step, adding the volatilizable halogen temperature of heat abstraction is 110 DEG C, processing time 1h.
Active carbon prepared by the preparation method of described fume mercury-removing active carbon, halogen load capacity mass percent is 50%~100%, the clearance 80%~100% of mercury, the saturated extent of adsorption mass percent 80%~150% of mercury.
beneficial effect:1. the preparation method of high effective flue gas removal of mercury active carbon, halogen load capacity is large, gas mercury saturated extent of adsorption high (mass ratio exceedes 100%), removal of mercury efficiency is high, and does not produce secondary pollution.2. give full play to Elemental Mercury and oxidation state mercury in the micropore enrichment of active carbon and the chemisorption combined removal flue gas of halogen.3. the NaOH solution of suitable concentration can effectively be removed surperficial oxy radical, and suitable surface pH value is conducive to the dipping of halide salt; 4. adopt suitable heat treatment temperature, can effectively remove unstable halogen, prevent the decomposition of halide salt simultaneously.
In concrete steps, adopt suitable NaOH solution can effectively remove Surface Chemistry of Activated Carbon group, cleaning inner surface, improves effective ratio area, gives full play to Accumulation with Activated Carbon effect; Meanwhile, suitable NaOH concentration both can reach the effect of removing oxy radical, can make again activated carbon surface be alkalescent, was conducive to the load of halide salt.Too high alkali concn can produce too much waste water simultaneously, is unfavorable for environmental protection.
Halogen is that 100% analysis is pure, and the concentration difference that different air capacities are carried must allow active carbon saturated adsorption halogen, could adsorb to greatest extent like this gas mercury.U-shaped pipe is in order to form certain malleation, increases load capacity.
Employing uniform temperature heating, can remove unstable halogen, can obtain the stable product of the removal of mercury, makes the abundant combination of halogen and halide salt, removes unconjugated halogen, makes product in the time of fume mercury-removing, can desorption, do not produce secondary pollution.
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Brief description of the drawings
Fig. 1 micropore active carbon pore structure distribution map; The mesoporous scope of the active carbon pore distribution concentration 0-5nm selecting, after this pore diameter range load halogen, is very suitable for the absorption of gas mercury.
Fig. 2 active carbon pore structure surface topography mirror image figure; The coconut husk matrix activated carbon pore structure of selecting is very flourishing, is suitable for doing carrier active carbon.
The affect figure of Fig. 3 active carbon loadings on fume mercury-removing efficiency; The loadings of load halogen active carbon is larger to fume mercury-removing effectiveness affects, and along with the increase of loadings, removal of mercury efficiency increases.
The former active carbon of Fig. 4 and modified activated carbon demercuration efficiency chart; The removal efficiency of the active carbon of the different halogens of load to gas mercury, the active carbon that wherein carries bromine reaches as high as 95% to the removal efficiency of mercury, adsorbs the removal of mercury efficiency that still can preserve value high in 6 hours.
The former active carbon of Fig. 5 and the adsorption capacity figure of modified activated carbon to mercury.The activated carbon supported halogen modified adsorption capacity to gas mercury significantly improves, and carries bromine modified activated carbon the highest to the absorption affinity of gas mercury, secondly for carrying iodine modified activated carbon.
Detailed description of the invention
The active carbon raw material adopting in method of the present invention can comprise the samples such as cocoanut active charcoal, ature of coal column charcoal, steam method wood activated charcoal.The halogen load factor of removal of mercury active carbon of the present invention, mercury saturated adsorption performance, removal of mercury efficiency can be controlled by heat treatment temperature and the time of volatilizable halogen on the load capacity of the removal solution concentration of raw material microporosity, surface functional group, halide salt, air velocity, halogen load time, active carbon.By selecting the high business active carbon of micropore, first it is carried out to alkali liquid washing place to go surface group, with finite concentration halide salt Immesion active carbon oven dry, be filled in U-shaped pipe, then active carbon carried out to gas phase load, coutroi velocity and load time with air load halogen, adsorb saturated after, load type active carbon is heat-treated at a certain temperature, remove volatilizable bromine, prepare high effective flue gas removal of mercury active carbon.Result of the test is as shown in Fig. 4-5.
The method of testing of the absorption property of the present invention to prepared active carbon and specific area is as follows:
(1) MQ201 coal-fired flue-gas mercury vapourmeter for the mercury removal efficiency of active carbon.
(2) mercury of active carbon inductive coupling plasma emission spectrograph (PE company of the U.S. for saturated extent of adsorption, model optima 7000) measure, Adsorption of Mercury is reached to saturated activity charcoal strong acid dissolution, measure the content of mercury in solution, calculate the saturated extent of adsorption of active carbon to mercury.
NaOH solution concentration 10 wt.%~30 wt.%, dipping halide salt solution concentration 10 wt.%~50 wt.%, air velocity 100-500mL/min, load time 1~5h, making active carbon halogen load capacity mass percent is 50 wt.%~90 wt.%, clearance 80 %~100 % of mercury, mercury capacity mass percent 80 wt.%~150 wt.%.
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embodiment 1
(1) raw material is removed surface chemistry group: the NaOH solution washing by coconut husk base seed activity carbon feedstock with 10 wt.%, 150 DEG C of oven dry.
(2) dipping halide salt: 30 g active carbon raw materials be impregnated in the Klorvess Liquid of mass concentration 15 wt.%, stir filtration drying 4 hours.
(3) load halogen: by the active carbon that is loaded with potassium chloride as in U-shaped pipe, form packed layer, inputted by packed layer top with 300mL/min air band chlorine, chlorine gas concentration is 0.13mg/L, under room temperature, maintain 10h, chlorine molecule is evenly written in activated carbon capillary, and chlorine is combined with potassium chloride and is formed thermally-stabilised good terchoride KCl
3.
(4) active carbon of load chlorine is heated at 110 DEG C to 1h and remove volatilizable halogen, prepare the good fume mercury-removing active carbon of thermally-stabilised good property.Carry chlorine dose 50 wt.%, mercury saturated extent of adsorption 80 wt.%, removal of mercury efficiency 86%(air-flow 4L/min in 72h, mercury concentration 10 mg/m
3).
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embodiment 2
(1) raw material is removed surface chemistry group: the NaOH solution washing by coconut husk base seed activity carbon feedstock with 30 wt.%, 150 DEG C of oven dry.
(2) dipping halide salt: 30 g active carbon raw materials be impregnated in the potassium bromide solution of mass concentration 20 wt.%, stir filtration drying 12 hours.
(3) load halogen: by the active carbon that is loaded with KBr as in U-shaped pipe, form packed layer, inputted by packed layer top with 300mL/min air band bromine, bromine concentration is 0.21mg/L, under room temperature, maintain 10h, bromine molecule is evenly written in activated carbon capillary, and bromine is combined with KBr and is formed thermally-stabilised good tribromide KBr
3.
(4) active carbon of load bromine is heated at 110 DEG C to 2h and remove volatilizable bromine, prepare the good fume mercury-removing active carbon of thermally-stabilised good property.Carry bromine amount 80 wt.%, mercury saturated extent of adsorption 150 wt.%, removal of mercury efficiency 100%(air-flow 4L/min in 72h, mercury concentration 10 mg/m
3).
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embodiment 3
(1) raw material is removed surface chemistry group: the NaOH solution washing by coconut husk base seed activity carbon feedstock with 30 wt.%, 150 DEG C of oven dry.
(2) dipping halide salt: 50 g active carbon raw materials be impregnated in the liquor kalii iodide of mass concentration 50 wt.%, stir filtration drying 12 hours.
(3) load halogen: by the active carbon that is loaded with KI as in U-shaped pipe, form packed layer, inputted by packed layer top with 300mL/min air band iodine, iodine concentration is 0.23mg/L, under room temperature, maintain 10h, bromine molecule is evenly written in activated carbon capillary, and bromine is combined with KBr and is formed thermally-stabilised good teriodide KI
3.
(4) active carbon of load iodine is heated at 100 DEG C to 1h and remove volatilizable iodine, prepare the fume mercury-removing active carbon of thermally-stabilised good property.Carry iodine amount 60 wt.%, mercury saturated extent of adsorption 120 wt.%, in 42h removal of mercury efficiency after 100%, 72 hour removal of mercury rate be down to 78%(air-flow 4L/min, mercury concentration 10 mg/m
3).
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embodiment 4
(1) raw material is removed surface chemistry group: the NaOH solution washing by coconut husk base seed activity carbon feedstock with 10 wt.%, 150 DEG C of oven dry.
(2) dipping halide salt: do not flood halide salt.
(3) load halogen: active carbon, as in U-shaped pipe, is formed to packed layer, inputted by packed layer top with 300mL/min air band chlorine, chlorine gas concentration is 0.13mg/L, maintains 10h under room temperature, and chlorine molecule is evenly written in activated carbon capillary.
(4) active carbon of load chlorine is heated at 110 DEG C to 1h and remove volatilizable halogen.Carry chlorine dose 5 wt.%, mercury saturated extent of adsorption 1 wt.%, the removal of mercury is most effective 46%, and 3h reaches absorption saturated (air-flow 4L/min, mercury concentration 10 mg/m
3).
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embodiment 5
Klorvess Liquid concentration in embodiment 1 is changed to 50 wt.%, and all the other obtain carried by active carbon chlorine dose 43 wt.% with embodiment 1, mercury saturated extent of adsorption 70 wt.%, removal of mercury efficiency 90%(air-flow 4L/min in 72h, mercury concentration 10 mg/m
3).
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embodiment 6
Change the bromine time of carrying in embodiment 2 into 5h, all the other obtain carried by active carbon bromine amount 67 wt.% with embodiment 2, mercury saturated extent of adsorption 110 wt.%, removal of mercury efficiency 84%(air-flow 4L/min in 72h, mercury concentration 10 mg/m
3).
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embodiment 7
Liquor kalii iodide concentration in embodiment 3 is changed to 30 wt.%, and all the other obtain carried by active carbon iodine amount 53 wt.% with embodiment 3, mercury saturated extent of adsorption 107 wt.%, removal of mercury efficiency 62%(air-flow 4L/min after 72h, mercury concentration 10 mg/m
3).
Claims (6)
1. the preparation method of fume mercury-removing active carbon, is characterized in that, comprises the steps:
The first step, raw material is removed surface chemistry group: by 100-200 DEG C of oven dry after the NaOH solution washing of 10 wt. %~30 wt.% for seed activity carbon feedstock;
Second step, dipping halide salt: raw material active carbon and the halide salt solution of removing surperficial oxy radical are carried out to hybrid infusion stirring 4 ~ 12 hours according to the mass ratio of 1:1~1:5, filtration drying, obtains being loaded with the active carbon of halide salt, and the concentration of described halide salt solution is 10 wt.%~50 wt. %;
The 3rd step, load halogen: the active carbon that is loaded with halide salt, as in U-shaped pipe, is formed to packed layer, inputted by packed layer top with 100-500mL/min band halogen air, maintain 1~10h under room temperature, obtain the active carbon of saturated load halogen;
The 4th step adds the active carbon of saturated load halogen the volatilizable halogen of heat abstraction at 80~120 DEG C, prepares fume mercury-removing active carbon.
2. the preparation method of fume mercury-removing active carbon as claimed in claim 1, is characterized in that, the solution described in the first step is NaOH solution, and concentration is 30 wt.%.
3. the preparation method of fume mercury-removing active carbon as claimed in claim 1, is characterized in that, in second step, halide salt is the one in potassium chloride, KBr, KI, and halide salt solution concentration is 15wt.%.
4. the preparation method of fume mercury-removing active carbon as claimed in claim 1, is characterized in that, in the 3rd step, halogen is the one in chlorine, bromine, iodine, air mass flow 300 mL/min.
5. the preparation method of fume mercury-removing active carbon as claimed in claim 1, is characterized in that, in the 4th step, adding the volatilizable halogen temperature of heat abstraction is 110 DEG C, processing time 1h.
6. the active carbon that prepared by the preparation method of the arbitrary described fume mercury-removing active carbon of claim 1~5, is characterized in that, halogen load capacity mass percent is 50%~100%, the clearance 80%~100% of mercury, the saturated extent of adsorption mass percent 80%~150% of mercury.
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