CN107511070A - Smoke treating method - Google Patents

Smoke treating method Download PDF

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Publication number
CN107511070A
CN107511070A CN201710939660.XA CN201710939660A CN107511070A CN 107511070 A CN107511070 A CN 107511070A CN 201710939660 A CN201710939660 A CN 201710939660A CN 107511070 A CN107511070 A CN 107511070A
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flue gas
treatment agent
fume treatment
treating method
smoke treating
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童裳慧
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Microtek Blue Industrial Co Ltd
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Microtek Blue Industrial Co Ltd
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Priority to CN201710939660.XA priority Critical patent/CN107511070A/en
Publication of CN107511070A publication Critical patent/CN107511070A/en
Priority to PCT/CN2018/103022 priority patent/WO2019062446A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8637—Simultaneously removing sulfur oxides and nitrogen oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8621—Removing nitrogen compounds
    • B01D53/8625—Nitrogen oxides
    • B01D53/8628—Processes characterised by a specific catalyst
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8668—Removing organic compounds not provided for in B01D53/8603 - B01D53/8665
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/40—Alkaline earth metal or magnesium compounds
    • B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/10—Inorganic adsorbents
    • B01D2253/106—Silica or silicates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/20—Metals or compounds thereof
    • B01D2255/207—Transition metals
    • B01D2255/20738—Iron
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602

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  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Treating Waste Gases (AREA)

Abstract

The invention discloses a kind of smoke treating method.This method comprises the following steps：(1) flue gas that oxygen content is 3~8vol% is subjected to dust removal process, obtains the flue gas after dedusting；Dustiness is 10~30mg/Nm in flue gas after the dedusting3；(2) flue gas after the dedusting is contacted with fume treatment agent, so as to carry out purified treatment to the flue gas after dedusting, described purified treatment includes desulphurization and denitration and Tuo bioxin；Flue-gas temperature is 200~500 DEG C, and flue gas flow rate is 3~8m/s；Wherein, following component is included based on 100 parts by weight fume treatment agent, fume treatment agent：The parts by weight of nano calcium oxide 70~96, the parts by weight of nanometer di-iron trioxide 2~15 and the parts by weight of nano silicon 2~15.The smoke treating method of the present invention can realize desulphurization and denitration, Tuo bioxin, and efficiency high simultaneously, simple to operate.

Description

Smoke treating method
Technical field
The present invention relates to a kind of smoke treating method, more particularly to a kind of method of flue gas desulfurization and denitrification Tuo bioxin.
Background technology
Sulfur dioxide is most common sulfur-containing oxide, there is intense irritation smell, is one of Air Pollutant Discharge.By Sulfur dioxide can be generated when generally all containing sulphur compound in coal and oil, therefore burning；Also substantial amounts of sulphur is contained in steel, Substantial amounts of sulfide can be produced in steel-making, ironmaking processes to be discharged into air.When sulfur dioxide is soluble in water, sulfurous can be formed Acid, and then form acid rain.If in the presence of nitrogen dioxide, SO2Further oxidation, will generate sulfuric acid, to environment and the mankind Health causes greatly to endanger.
Also contain substantial amounts of nitrogen in steel and coal, under the conditions of high-temp combustion, then generate NOx, NOxMainly with NO shape Formula is present, the NO initially dischargedxMiddle NO accounts for 95%.NO easily reacts with the oxygen in air in an atmosphere, generates NO2. Temperature is larger or in the presence of having cloud and mist, NO2Further act on forming nitric acid with hydrone, nitric acid be also to be formed acid rain it is important into Point.In the presence of having catalyst, along with suitable meteorological condition, NO2The speed for being transformed into nitric acid is accelerated, and particularly works as NO2With SO2In the presence of simultaneously, it can mutually be catalyzed, form the speed of nitric acid faster.
Bioxin (1,4- Dioxins) is a monocyclic organic compound.It is a kind of not use industrially The accessory substance at place, often it is present in small particle in air, soil and water, main pollution sources are chemical industry metallurgical industry, rubbish Rubbish burning, papermaking and production agrochemical industry.Metal smelt can produce substantial amounts of bioxin, particularly red copper, aluminum and zinc Smelting can produce substantial amounts of bioxin.Metal smelt is to discharge the important sources of these toxic gases.
With severe supervision of the enhancing and country of people's environmental consciousness to metal smelt discharge gas, develop desulphurization denitration Tuo bioxin technologies become particularly important.The method that generally uses can only solely desulphurization and denitration, Tuo bis- Evil both at home and abroad at present English, or desulphurization and denitration simultaneously, and can not be simultaneously by three kinds of devolatilizations.
At present, the main method of industrial desulfurization has lime-limestone desulfurization, and absorbent powder is made into slurries, absorbed By the SO in flue gas in tower2Absorb.Wet desulphurization can produce substantial amounts of waste water, it is necessary to increase Waste Water Treatment.Operating cost Height, floor space is big, and system management operation is complicated, and erosion corrosion phenomenon is than more serious.And byproduct caused by desulfurization because Quality is not high, and the market space is limited and is largely stacked, and secondary pollution is caused to environment.
At present, the main method of in the market denitration is SCR (SCR) method, in the presence of catalyst, In the presence of having oxygen, the ammonia in reactor is passed through prior to the NO in flue gasxReaction, generates environmentally safe N2With H2O.SCR technology denitration efficiency is very high, and Technical comparing is ripe, and still, operating cost is higher.And depositing due to catalyst In the SO in flue gas2It is oxidized easily and produces SO3, and corruption is caused to equipment with excess of ammonia solid/liquid/gas reactions generation ammonium hydrogen sulfate Erosion.
Removing currently for dioxin in flue gas is mainly charcoal absorption and flue gas quenching technology.Activated carbon simply will Bioxin is transferred in activated carbon from flue gas, it is impossible to fundamentally removes bioxin.Flue gas quenching technology refers to flue gas Temperature is plummeted to less than 200 DEG C from 800 DEG C, avoids the generation of bioxin.For example, the China of Application No. 201220444793.2 Patent application discloses a kind of device for suppressing to produce bioxin in incineration flue gas, and the device is not producing the safety temperature of bioxin Interval range is spent, the high-temperature flue gas from incinerator is first down to by middle-temperature section using waste heat recovery mode, is then disliked in generation two Chilling cooling is implemented in the sensitive temperature region of English, ensures that the content of the dioxin in incineration smoke of discharge is significantly less than national standard Defined Con trolling index.This method causes ample resources to waste, and can not realize desulphurization denitration simultaneously.
Therefore, it is necessary to it is a kind of can simultaneously desulphurization and denitration, the smoke treating method of Tuo bioxin.
The content of the invention
It is an object of the invention to provide a kind of smoke treating method, it can desulphurization and denitration, Tuo bioxin simultaneously.Enter One step, method efficiency high of the invention, simple to operate, operating cost is low.
The present invention provides a kind of smoke treating method, and it comprises the following steps：
(1) flue gas that oxygen content is 3~8vol% is subjected to dust removal process, obtains the flue gas after dedusting；After the dedusting Flue gas in dustiness be 10~30mg/Nm3；
(2) flue gas after the dedusting is contacted with fume treatment agent, so as to carry out purified treatment to the flue gas after dedusting, Described purified treatment includes desulphurization and denitration and Tuo bioxin；Flue-gas temperature is 200~500 DEG C, and flue gas flow rate is 3~8m/s；
Wherein, following component is included based on 100 parts by weight fume treatment agent, fume treatment agent：Nano calcium oxide 70~96 Parts by weight, the parts by weight of nanometer di-iron trioxide 2~15 and the parts by weight of nano silicon 2~15.
According to the smoke treating method of the present invention, it is preferable that in step (1), the fume treatment agent also includes adhesive, The binding agent is selected from least one of lactic acid, carboxymethyl cellulose, polyvinyl alcohol, starch, aluminum oxide, field green grass or young crops powder.
According to the smoke treating method of the present invention, it is preferable that in step (1), the fume treatment agent also includes glass fibers Dimension.
According to the smoke treating method of the present invention, it is preferable that described fume treatment agent is made by the following method：Will be each Individual component is well mixed, and obtains solid mixture, the solid mixture is well mixed with water to obtain half dry mixture, by institute State the shaping of half dry mixture, again through steam press maintenance and drying, obtain the fume treatment agent；The temperature of the steam press maintenance is 160~200 DEG C, pressure is 0.6~1.8MPa.
According to the smoke treating method of the present invention, it is preferable that the fume treatment agent is graininess, and it is selected from sheet Grain, spherical particle or cylindrical particle；The thickness of the sheet-like particle is 5~10mm, and a diameter of 10~25mm；The column A diameter of 1~3mm of grain, and length is 3~8mm；A diameter of 2~5mm of the spherical particle.
According to the smoke treating method of the present invention, it is preferable that the purified treatment is described in calandria type fixed bed middle progress Fume treatment agent is filled in the calandria type fixed bed reaction tube, its packed height for the reaction tube length 80~ 90%；And the diameter of the reaction tube is more than 8 times of the diameter of the fume treatment agent.
According to the smoke treating method of the present invention, it is preferable that the fume treatment agent is cellular；The aperture of honeycomb hole is 4.5~7.5mm, the density of honeycomb hole is 800~1200/m2。
According to the smoke treating method of the present invention, it is preferable that the fume treatment agent is tabular module, and by as follows It is prepared by method：By half dry mixture coated on flat substrates surface, veneer then is made by fold and cutting, by institute State veneer and be assembled into tabular module.
According to the smoke treating method of the present invention, it is preferable that the height of the veneer is 400~800mm, width 400 ~550mm, thickness is 0.5~1.0mm, and the spacing between two neighboring veneer is 5~9mm.
According to the smoke treating method of the present invention, it is preferable that the SO of the flue gas before dust removal process2Concentration be 1000~ 3000mg/m3, NOxConcentration is 100~350mg/m3, the concentration of raw body is 5~25ngTEQ/m before bioxin3。
The smoke treating method of the present invention can realize the desulphurization and denitration and Tuo bioxin of flue gas, and efficiency high, behaviour simultaneously Make simply, operating cost is low, and use range is wide, and will not produce pollutant, does not cause secondary pollution to environment.The present invention's The desulfuration efficiency of smoke treating method is up to more than 95%, denitration efficiency more than 94%, Tuo bioxin efficiency more than 91%.
Embodiment
With reference to specific embodiment, the present invention is further illustrated, but protection scope of the present invention is not limited to This.
The smoke treating method of the present invention can carry out the comprehensive regulation to flue gas simultaneously, so as to remove two in flue gas simultaneously Sulfur oxide, nitrogen oxides He bioxin etc..This method includes following dust removal step, purified treatment step etc..
<Dust removal step>
The dust removal step of the present invention is that the flue gas that oxygen content is 3~8vol% is carried out into dust removal process, after obtaining dedusting Flue gas；Dustiness is 10~30mg/Nm in flue gas after the dedusting3。
In the present invention, the oxygen content in flue gas is 3~8vol%, preferably 5~8vol%.When oxygen content is in flue gas During above range, it can make the nanometer di-iron trioxide in fume treatment agent that NO is oxidized into NO2, so as to ensure denitration effect. The smoke treating method of the present invention also includes the step of oxygen content of regulation flue gas.Specifically, when oxygen content deficiency in flue gas, Air or oxygen can be added into flue gas using oxidation fan, to make oxygen content in flue gas reach above range.Flue gas contains Oxygen content control is suitable within the scope of the invention, and oxygen content is too low in flue gas, it is impossible to ensures denitration effect；Oxygen content mistake Height, then increase energy consumption and cost.
The method that dust removal process can use cloth-sack-type dust removal, spiral-flow type dedusting or electric precipitation, and preferably electric precipitation. By dust-removing process, particle larger and small in flue gas can be removed.Dustiness is 10~30mg/ in flue gas after dedusting Nm3, preferably 10~20mg/Nm3, more preferably 10~15mg/Nm3.The dustiness in flue gas after dedirt is above range When, it can ensure that flue gas passes through the duct of fume treatment agent, and be not susceptible to block at the flue gas being molded with heavy wear Manage agent.
Before dust removal process, SO in flue gas2Concentration is 1000~3000mg/m3, more preferably 1500~2500mg/m3。 NO in the flue gasxConcentration is 100~350mg/m3, more preferably 100~250mg/m3.Raw body before the dioxin in flue gas The concentration of (such as chlorophenol) is 5~25ngTEQ/m3, more preferably 10~17ngTEQ/m3.Water content is in the flue gas 0.5~8wt%, more preferably 1~5wt%.Removal effect can so be improved.TEQ represents international toxicity equivalent, has ability Implication known to domain.
<Purified treatment step>
The purified treatment of the present invention is contacts the flue gas after the dedusting with fume treatment agent, so as to the cigarette after dedusting Gas carries out purified treatment, and described purified treatment includes desulphurization and denitration and Tuo bioxin.The temperature of purified treatment is 200~500 DEG C, preferably 230~400 DEG C.At this temperature, the di-iron trioxide catalysis NO being more beneficial in fume treatment agent is oxidized to NO2, calcium oxide and dioxin in flue gas class previous existence precursor reactant in fume treatment agent, hinder the generation of bioxin, while flue gas Nano calcium oxide active component can be with desulphurization denitration in inorganic agent.The flow velocity of flue gas can be 3~8m/s, preferably 4~6m/s. Using such flow velocity, flue gas can smoothly flow through fume treatment agent, can ensure that gas cleaning processing can be carried out continuously.
Based on 100 parts by weight fume treatment agent, fume treatment agent of the invention includes following component：Nano calcium oxide 70~ 96 parts by weight, the parts by weight of nanometer di-iron trioxide 2~15 and the parts by weight of nano silicon 2~15.Preferably, it is included as follows Component：The parts by weight of nano calcium oxide 80~90, the parts by weight of nanometer di-iron trioxide 5~10 and the weight of nano silicon 5~10 Part.According to an embodiment of the invention, the fume treatment agent is only made up of following component：The weight of nano calcium oxide 70~96 Measure part, the parts by weight of nanometer di-iron trioxide 2~15 and the parts by weight of nano silicon 2~15.Nano silicon is SO2And NO Certain adsorptivity is provided, improves possibility of the reactant in fume treatment agent adsorption；Nano silicon and nanometer Calcium oxide generates gelatification so as to improve the intensity of fume treatment agent；And excessive nano calcium oxide is out of stock as desulfurization Agent, and with dioxin in flue gas class previous existence precursor reactant, hinder the generation of bioxin；Nanometer di-iron trioxide is then by NO catalyzed conversions For NO2。
In the present invention, nano calcium oxide particle surface and the SO in flue gas2By gas-solid phase reaction generate calcium sulfite and Calcium sulfate, reach and remove SO2Purpose.Nanometer di-iron trioxide particle can be urged effectively when being in high temperature (200~350 DEG C) Change oxidation NO so as to generate NO2, NO2It is more beneficial for by nano oxidized calcium uptake, so as to remove nitrogen oxides.Nano silicon As additive, it can make fume treatment agent that there is higher catalytic activity under wider temperature window；Nano-silica simultaneously Gelatification is formed between SiClx and nano calcium oxide, it is possible to increase the mechanical performance of fume treatment agent.Pass through three kinds of oxides Between synergy, and the high feature of nano material surface active is utilized, so as to carry out simultaneous SO_2 and NO removal Tuo bis- Evil to flue gas English.
According to another implementation of the invention, the fume treatment agent also includes binding agent, and it is used to receive described Rice calcium oxide, nanometer di-iron trioxide and nano silicon are bonded together, consequently facilitating using.The binding agent can select From at least one of lactic acid, carboxymethyl cellulose, polyvinyl alcohol, starch, aluminum oxide, field green grass or young crops powder；Preferably carboxymethyl cellulose Element or starch.In the present invention, the weight of the binding agent accounts for 1~10wt% of the fume treatment agent.Fume treatment agent may be used also With including fiber, such as glass fibre, so as to improve the tensile resistance of fume treatment agent.
In the present invention, the particle diameter of nano silicon, nano calcium oxide and nanometer di-iron trioxide can be 5~ 100nm, preferably 10~90nm.
The fume treatment agent of the present invention can be made by the following method：Each component is well mixed, solid is obtained and mixes Compound, the solid mixture is well mixed with water to obtain half dry mixture, by half dry mixture shaping, again through steam pressure Maintenance and drying, obtain the fume treatment agent.The temperature of steam press maintenance is 160~200 DEG C, and pressure is 0.6~1.8MPa.It is excellent Selection of land, treatment temperature are 180~190 DEG C, and pressure is 0.8~1.5MPa.The temperature of drying is 100~120 DEG C.By above-mentioned place Reason, can improve desulphurization denitration and Tuo bioxin effects.
The fume treatment agent of the present invention can be graininess, cellular or tabular；Preferably cellular or tabular.This Sample is easy to improve desulfurization off sulfide effect.
According to an embodiment of the invention, fume treatment agent is graininess.It can be sheet-like particle, spherical particle Or at least one of cylindrical particle.The thickness of the sheet-like particle is 5~10mm, a diameter of 10~25mm.The sheet Grain can use rotary tablet machine or single-punch tablet press to prepare.The diameter range of the cylindrical particle is 1~3mm, length For 3~8mm；Preferably, the diameter range of the cylindrical particle is 1~2mm, and length is 2~5mm；It is highly preferred that the column A diameter of 1.5mm of particle, length 3mm.The cylindrical particle can use single-screw extruder, double screw banded extruder or Strip is made in hydraulic banded extruder, is then cut into the cylindrical particle of certain length.The diameter model of the spherical particle Enclose for 2~5mm.The spherical particle can use single-screw extruder, double screw banded extruder or hydraulic banded extruder first Strip is made in preparation, is cut to that diameter is of substantially equal with length, and then shaped comminutor is processed into again.
In the present invention, the purified treatment can be filled in calandria type fixed bed middle progress, the fume treatment agent In the calandria type fixed bed reaction tube, its packed height is the 80~90% of the length of the reaction tube；And the reaction The diameter of pipe is more than 8 times of the diameter of the fume treatment agent.Calandria type fixed bed reaction tube caliber can be 15~ 150mm, and the reaction tube diameter is more than 8 times of the graininess fume treatment agent diameter.Using such setting, flue gas with The graininess fume treatment agent has larger contact area, so as to be advantageous to the desulphurization denitration of flue gas.It is calandria type fixed bed Heat transferring medium can be selected from conduction oil, fused salt or flue gas, to ensure that heating-up temperature reaches 200~500 DEG C.The heat exchange is situated between Matter is more preferably fused salt.Flue gas it is described it is calandria type fixed bed in flow velocity can be 3~8m/s, preferably 4~6m/s.Using Such flow velocity, flue gas can smoothly flow through fume treatment agent, and dust stratification is less in reaction tube.
According to another implementation of the invention, fume treatment agent is cellular.The aperture of honeycomb hole can be 4.5~ 7.5mm, more preferably 5~6.5mm, it is further preferably 5.11~6.35mm.The density of honeycomb hole can be 800~1200/m2, Preferably 900~1100/m2.The length of the fume treatment agent is 700~1500mm.Cellular fume treatment agent is placed in In exhaust gases passes, purified treatment is then carried out.
In the present invention, the diameter of the diameter and the exhaust gases passes of cellular fume treatment agent matches.For example, flue gas The length of inorganic agent is 1000mm, and section is 150 × 150mm, and the quantity of honeycomb hole is 22.Flue gas passes through the cellular cigarette The flow velocity of gas disposal agent is 3~8m/s, more preferably 4~6m/s.Using such flow velocity, flue gas smoothly can be flowed through at flue gas Agent is managed, ensures that gas cleaning processing is carried out continuously.
According to yet further embodiment of the invention, fume treatment agent is tabular.Half dry mixture is coated in sheet On substrate surface, veneer then is made by fold and cutting, the veneer is assembled into tabular fume treatment agent.Veneer Height can be 400~800mm, more preferably 500~700mm；The width of veneer can be 400~550mm, more preferably 420~500mm, it is further preferably 430~470mm；The thickness of veneer can be 0.5~1.0mm, more preferably 0.6~0.8mm. According to an embodiment of the invention, the height of the veneer is 600mm, and width is 450mm or so, thickness 0.7mm.It is adjacent Spacing between veneer can be 5~9mm, preferably 6~8mm.Tabular fume treatment agent is placed in exhaust gases passes, then Carry out purified treatment.
In the present invention, flow velocity of the flue gas Jing Guo tabular fume treatment agent module is 3~8m/s, more preferably 4~6m/ s.Using such flow velocity, flue gas can smoothly flow through fume treatment agent, ensure that gas cleaning processing is carried out continuously.
Further illustrate the implementation of the present invention by the following examples, but be not construed as limiting the invention. In following examples, the average grain diameter of nano calcium oxide, nanometer di-iron trioxide and nano silicon is 25nm.
Preparation example 1
It is that 80 parts by weight, the parts by weight of nanometer di-iron trioxide 10 and the parts by weight of nano silicon 10 are mixed by nano calcium oxide Close uniformly, obtain solid mixture, be mixed with water, obtain half dry mixture, add hydraulic banded extruder, be made a diameter of 1.5mm, the cylindrical particle that length is 3mm, dry, obtain flue gas desulfurization and denitrification agent.
Preparation example 2
It is that 90 parts by weight, the parts by weight of nanometer di-iron trioxide 5 and the parts by weight of nano silicon 5 mix by nano calcium oxide Uniformly, solid mixture is obtained, is mixed with water, obtains half dry mixture, adds rotary tablet machine, thickness, which is made, is 8mm, a diameter of 10mm sheet-like particle, dry, obtain flue gas desulfurization and denitrification agent.
Preparation example 3
It is that 90 parts by weight, the parts by weight of nanometer di-iron trioxide 5 and the parts by weight of nano silicon 5 mix by nano calcium oxide Uniformly, solid mixture is obtained, is mixed with water, obtains half dry mixture, double screw banded extruder is added, extrusion, cuts into Diameter 2mm, length 2mm cylindrical particle, dry, obtain flue gas desulfurization and denitrification agent.
Preparation example 4
The half dry mixture pressurization of preparation example 2 is coated on flat substrates surface (slim stainless steel mesh plate), then Fold, cutting, are made veneer, multiple described veneers are assembled into tabular flue gas desulfurization and denitrification agent, the height of wherein veneer is 600mm, width 450mm, thickness 0.7mm, the spacing between adjacent veneer is 7mm.
Preparation example 5
Half dry mixture of preparation example 1 is pressed into cellular, obtains cellular flue gas desulfurization and denitrification agent, the hole of honeycomb hole Footpath is 6mm, and density is 1000/m2, length 800mm.
Embodiment 1
(1) it is 3vol% by oxygen content, water content 1wt%, SO2Concentration is 1500mg/m3、NOxConcentration is 100mg/ m3, the concentration of raw body is 10ngTEQ/m before bioxin3Flue gas dedusting is carried out using electric cleaner, contain in the flue gas after dedusting Dust quantity is 10mg/Nm3；
(2) by particles filled to the calandria type fixed bed reaction tube of preparation example 1, a diameter of 135mm of reaction tube, change Thermal medium is fused salt, and packed height of the sheet-like particle in reaction tube is the 90% of tube length of reaction tube；Flue gas after the dedusting Calandria type fixed bed by this, flow velocity 5m/s, temperature is 200 DEG C in reaction tube, carries out purified treatment, and desulfuration efficiency is 95.6%, denitration efficiency 96.2%, Tuo bioxin efficiency is 92%, and the flue gas after purification meets discharge standard.
Embodiment 2
(1) it is 4vol% by oxygen content, water content 3wt%, SO2Concentration is 2000mg/m3、NOxConcentration is 200mg/ m3, the concentration of raw body is 15ngTEQ/m before bioxin3Flue gas dedusting is carried out using electric cleaner, contain in the flue gas after dedusting Dust quantity is 12mg/Nm3；
(2) the cellular fume treatment agent of preparation example 5 is positioned in flue, the flue gas after dedusting passes through the cellular cigarette Gas disposal agent, flow velocity 4m/s, carry out purified treatment, desulfuration efficiency 95.2%, denitration efficiency 94.3%, Tuo bioxin effect Rate is 91%, and the flue gas after purification meets discharge standard.
Embodiment 3
(1) it is 6vol% by oxygen content, water content 5wt%, SO2Concentration is 2500mg/m3、NOxConcentration is 250mg/ m3, the concentration of raw body is 17ngTEQ/m before bioxin3Flue gas dedusting is carried out using electric cleaner, contain in the flue gas after dedusting Dust quantity is 14mg/Nm3；
(2) the fume treatment agent of preparation example 5 is positioned in flue, the flue gas after dedusting passes through the fume treatment agent, stream Speed is 6m/s, carries out purified treatment, and desulfuration efficiency 96.8%, denitration efficiency 95.7%, Tuo bioxin efficiency is 90.8%, Flue gas after purification meets discharge standard.
The present invention is not limited to above-mentioned embodiment, in the case of without departing substantially from the substantive content of the present invention, this area skill Any deformation, improvement, the replacement that art personnel are contemplated that each fall within the scope of the present invention.

Claims (10)

1. a kind of smoke treating method, it is characterised in that the smoke treating method comprises the following steps：
(1) flue gas that oxygen content is 3~8vol% is subjected to dust removal process, obtains the flue gas after dedusting；Cigarette after the dedusting Dustiness is 10~30mg/Nm in gas3；
(2) flue gas after the dedusting is contacted with fume treatment agent, it is described so as to carry out purified treatment to the flue gas after dedusting Purified treatment include desulphurization and denitration and Tuo bioxin；Flue-gas temperature is 200~500 DEG C, and flue gas flow rate is 3~8m/s；
Wherein, following component is included based on 100 parts by weight fume treatment agent, fume treatment agent：The weight of nano calcium oxide 70~96 Part, the parts by weight of nanometer di-iron trioxide 2~15 and the parts by weight of nano silicon 2~15.
2. smoke treating method according to claim 1, it is characterised in that in step (1), the fume treatment agent is also wrapped Include adhesive, the binding agent in lactic acid, carboxymethyl cellulose, polyvinyl alcohol, starch, aluminum oxide, field green grass or young crops powder at least It is a kind of.
3. smoke treating method according to claim 2, it is characterised in that in step (1), the fume treatment agent is also wrapped Include glass fibre.
4. according to the smoke treating method described in any one of claims 1 to 3, it is characterised in that described fume treatment agent is led to Following method is crossed to be made：Each component is well mixed, obtains solid mixture, the solid mixture is well mixed with water Half dry mixture is obtained, half dry mixture is molded, again through steam press maintenance and drying, obtains the fume treatment agent；Institute The temperature for stating steam press maintenance is 160~200 DEG C, and pressure is 0.6~1.8MPa.
5. smoke treating method according to claim 4, it is characterised in that the fume treatment agent is graininess, and it is selected From sheet-like particle, spherical particle or cylindrical particle；The thickness of the sheet-like particle is 5~10mm, and a diameter of 10~25mm；Institute A diameter of 1~3mm of cylindrical particle is stated, and length is 3~8mm；A diameter of 2~5mm of the spherical particle.
6. smoke treating method according to claim 4, it is characterised in that the purified treatment is entered in calandria type fixed bed OK, the fume treatment agent is filled in the calandria type fixed bed reaction tube, and its packed height is the length of the reaction tube The 80~90% of degree；And the diameter of the reaction tube is more than 8 times of the diameter of the fume treatment agent.
7. smoke treating method according to claim 4, it is characterised in that the fume treatment agent is cellular；Honeycomb hole Aperture is 4.5~7.5mm, and the density of honeycomb hole is 800~1200/m2。
8. smoke treating method according to claim 4, it is characterised in that the fume treatment agent is tabular module, and is led to Following method is crossed to prepare：By half dry mixture coated on flat substrates surface, list then is made by fold and cutting Plate, the veneer is assembled into tabular module.
9. smoke treating method according to claim 8, it is characterised in that the height of the veneer is 400~800mm, Width is 400~550mm, and thickness is 0.5~1.0mm, and the spacing between two neighboring veneer is 5~9mm.
10. according to the smoke treating method described in any one of claims 1 to 3, it is characterised in that the flue gas before dust removal process SO2Concentration is 1000~3000mg/m3, NOxConcentration is 100~350mg/m3, before bioxin the concentration of raw body for 5~ 25ng·TEQ/m3。
CN201710939660.XA 2017-09-30 2017-09-30 Smoke treating method Pending CN107511070A (en)

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