CN105396421A - Comprehensive adsorption and desulphurization dedusting purification method of baking flue gas - Google Patents

Comprehensive adsorption and desulphurization dedusting purification method of baking flue gas Download PDF

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Publication number
CN105396421A
CN105396421A CN201510689406.XA CN201510689406A CN105396421A CN 105396421 A CN105396421 A CN 105396421A CN 201510689406 A CN201510689406 A CN 201510689406A CN 105396421 A CN105396421 A CN 105396421A
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flue gas
calcium hydroxide
reactor
dust
baking
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李树元
齐晓辉
黎卫军
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Hebei Jinke Environmental Protection Equipment Co Ltd
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Hebei Jinke Environmental Protection Equipment Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/02Separation 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 by adsorption, e.g. preparative gas chromatography
    • B01D53/06Separation 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 by adsorption, e.g. preparative gas chromatography with moving adsorbents, e.g. rotating beds
    • B01D53/10Separation 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 by adsorption, e.g. preparative gas chromatography with moving adsorbents, e.g. rotating beds with dispersed adsorbents
    • B01D53/12Separation 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 by adsorption, e.g. preparative gas chromatography with moving adsorbents, e.g. rotating beds with dispersed adsorbents according to the "fluidised technique"
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D50/00Combinations of methods or devices for separating particles from gases or vapours
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/46Removing components of defined structure
    • B01D53/60Simultaneously removing sulfur oxides and nitrogen oxides
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/76Gas phase processes, e.g. by using aerosols
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/77Liquid phase processes
    • B01D53/78Liquid phase processes with gas-liquid contact
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/81Solid phase processes
    • B01D53/83Solid phase processes with moving reactants
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2251/00Reactants
    • B01D2251/40Alkaline earth metal or magnesium compounds
    • B01D2251/404Alkaline earth metal or magnesium compounds of calcium
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2253/00Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/10Inorganic adsorbents
    • B01D2253/112Metals or metal compounds not provided for in B01D2253/104 or B01D2253/106
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2257/00Components to be removed
    • B01D2257/20Halogens or halogen compounds
    • B01D2257/204Inorganic halogen compounds
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2257/00Components to be removed
    • B01D2257/30Sulfur compounds
    • B01D2257/302Sulfur oxides
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2257/00Components to be removed
    • B01D2257/40Nitrogen compounds
    • B01D2257/404Nitrogen oxides other than dinitrogen oxide
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2257/00Components to be removed
    • B01D2257/70Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2258/00Sources of waste gases
    • B01D2258/02Other waste gases
    • B01D2258/0283Flue gases
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Abstract

The invention discloses a comprehensive adsorption and desulphurization dedusting purification method of baking flue gas. The method comprises the processes of baking flue gas cooling, adsorption dedusting and cloth bag dedusting, and is characterized in that calcium hydroxide powder is fully mixed with and reacts with reversed high-flow velocity flue gas to carry out surface adsorption in order to remove harmful tar, HF, SO2, NOx and dusts in the flue gas; and obtained flue gas enters a cloth bag deduster to carry out gas-liquid separation and filtration, obtained flue gas is discharged by a chimney, and calcium hydroxide obtained after filtration is conveyed to a calcium hydroxide bin and is stored in the calcium hydroxidebin. The method has the advantages of simple process flow, simultaneous removal of various harmful substances in the flue gas, recovery and reuse of an adsorbent calcium hydroxide, and especially effective absorption of NO2. The method is advanced, realizes high efficiency and many kinds of the harmful substances removed from the flue gas, and allows the discharge concentration of the flue gas to be better than notational current discharge standards.

Description

Baking flue gas comprehensive adsorption desulfurize dust-removing and purifying method technique
Technical field
The present invention relates to a kind of baking flue gas purification techniques, particularly baking flue gas comprehensive adsorption desulfurize dust-removing and purifying method technique.
Background technology
The flue gas that carbon element factory's roaster produces contains a large amount of sulfide, fluoride, tar, dust, NO n, the harmful substance such as BaP, these materials all can produce serious harm to animals and plants, human body, particularly sour gas SO 2, NO xand HF has the corrosivity of height, multiclass carcinogenic substance BaP harm is wherein larger.Current is adopt single electrical tar precipitator or electrical tar precipitator rear end to install alumina adsorption dry scrubbing plant additional to the process of carbon baking flue gas mostly, this cleaning equipment can only collect tar, dust, FH and small part BaP, in flue gas, sulphur-containing substance, nitrogen dioxide, nitric oxide etc. almost cannot process (also needing as processed to install other desulphurization denitration purification apparatus additional), cause high risks after this baking flue gas discharge to environment; Along with people to the reinforcement of environment environmental consciousness and country to the attention of environmental issue.Carbon element factory's baking furnace fume Comprehensive Treatment of Pollution technology has yet-to-be developed in the urgent need to raising and new type purification technology.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of baking flue gas comprehensive adsorption desulfurize dust-removing and purifying method technique, by using the spray column with cooling function, comprehensive adsorption cleaning desulfurating dust-removing equipment, with fluorine, SO in calcium hydroxide absorption flue gas 2, NO x, the harmful substance such as dust, make depickling cleaner simple, purification efficiency is high, and whole technology is reasonable in design, technological process simple, and operating cost is low, does not cause secondary pollution, and material can utilize by secondary.
In order to realize the object solved the problems of the technologies described above, present invention employs following technical scheme:
Baking flue gas of the present invention comprehensive adsorption desulfurize dust-removing and purifying method technique, comprises following process:
(1), baking flue gas cooling process:
Make flue gas enter spray column with the suction that air-introduced machine produces, water is driven by water pump, mixes with compressed air through pipeline, is sprayed by spray tip, automatically controls spray gun water yield size by PLC control system, makes roaster high-temperature flue-gas drop to design temperature.Like this, in baking flue gas cooling process, because the oxygen content of baking flue gas own is very low, the O that compressed air blasts 2can react with NO and generate NO 2, the NO of generation 2in absorption dust-removing process subsequently, effectively can be absorbed by calcium hydroxide.
Concrete, ensure that flue-gas temperature is no more than 100 DEG C through spraying cooling; By baking flue gas cooling process, make smoke moisture suitably improve to increase ashes particle diameter, be beneficial to later purification process, the baking flue gas after cooling, the nitric oxide be also conducive in flue gas generates nitrogen dioxide with oxygen reaction further, is convenient to absorb;
Concrete, be with water rate to be less than 1% in cooling spray column exiting flue gas, and water exist with flue gas with steam state form.
Concrete further, import flue is provided with in spray column import, keep away in spray column and do acid and alkali-resistance preservative treatment, import flue hypomere tower body installs a set of spray equipment, rinse the harmful substance in flue gas, lower the temperature, tower body is provided with smoke evaporative condensation segment, and the structure of condensation segment needs to ensure that flue gas fully mixes with water liquid, contacts, reacts, be with water rate to be less than 1% in spray column exiting flue gas, and water exist with flue gas with steam state form.Passable like this, avoid rear end flue gas to dissolve sour gas because moisture content is too large, corrosion is caused to rear end cleaning equipment.
(2), dust-removing process is adsorbed:
Baking flue gas after cooling enters adsorptive reactor, calcium dihydroxide powders discharge in feed bin after after charging gear, under the metering of Weighing device, regulate conveying calcium hydroxide amount size by feeding control device, be more evenly transported in adsorptive reactor through pneumatic chute under compressed-air actuated effect;
Calcium dihydroxide powders, in adsorptive reactor, becomes fluidisation state, fully mix with the high flow rate flue gas oppositely entered contact, react, adsorption, remove the nuisance tar in flue gas, HF, SO 2, N xo y, dust etc.
More specifically, between pneumatic chute and reactor, being provided with control feed valve, controlling to enter the uniformity of calcium hydroxide in each reactor by controlling feed valve;
More specifically, adsorptive reactor can use conventional in the market VRI reactor, venturi reactor, ring type upstream injection high efficiency reactor, gravity upstream injection reactor, fluidized-bed reactor etc.;
(3), bag-type dust operation:
Contain hazardous substance flue gas in adsorptive reactor through calcium hydroxide absorption after, enter sack cleaner containing the calcium hydroxide of adsorbate, soot dust granule and flue gas and carry out gas solid separation filtration, clean flue gas after filtration, purification is through air-introduced machine directly by smoke stack emission, and sack cleaner ash bucket inner filtration solid residue is out delivered to calcium hydroxide material bin containing the calcium hydroxide being adsorbed with nuisance and stores.
More specifically, to be delivered to via Pneumatic lift containing the calcium hydroxide being adsorbed with nuisance and to return calcium hydroxide material bin and store, as calcining desulfurization or basic unit's thing of repairing the roads for subsequent use.
More specifically, comprehensive adsorptive reactor outlet is connected to sack cleaner inlet pipeline, and sack cleaner is provided with dusty gas filter cloth bag and deashing device, and sack cleaner outlet is provided with flue, is connected with blower fan and chimney; Bagroom bottom is provided with powder ash bucket, in ash bucket, deposition is delivered to reactor continuation reaction containing a nuisance calcium dihydroxide powders part by the charging gear that ash bucket is installed and circulation transporting chute, a part is delivered to by the charging gear that ash bucket is installed and returns transporting chute and be delivered to Pneumatic lift, will be delivered to return calcium hydroxide material bin and be in store for by Pneumatic lift containing nuisance calcium dihydroxide powders.
The principle of technical scheme of the present invention is:
Calcium dihydroxide powders adds reactor in a large number under compressed-air actuated effect, fully mix with the high flow rate flue gas oppositely entered at reactor place contact, react, adsorption, the nuisance tar in flue gas, HF, SO can be removed 2, NO x, the harmful substance such as dust.
Concrete reaction equation is:
A small amount of SO 2+ Ca (OH) 2→ CaSO 3+ H 2o
Volume SO 2+ Ca (OH) 2→ Ca (HSO 3) 2
HF+Ca(OH) 2→CaF 2+H 2O
Ca(OH) 2+NO+NO 2→Ca(NO 2) 2+H 2O
Ca(OH) 2+NO 2→Ca(NO 2) 2+Ca(NO 2) 3+H 2O
Ca(OH) 2+N 2O 4→Ca(NO 2) 2+Ca(NO 2) 3+H 2O
In baking flue gas cooling process, NO also can react further and generate NO 2.Favors low temperature generates NO in NO 2.NO 2also N can be further converted to 2o 4.
NO+O 2→NO 2
NO 2→N 2O 4
By adopting technique scheme, the present invention has following beneficial effect:
Present invention process flow process is simple, take up an area little, small investment, energy consumption is low, a set of equipment can remove the multiple harmful substances in flue gas simultaneously, to first flue gas purification thoroughly, does not produce secondary pollution, adsorbent calcium hydroxide recycling can be reclaimed simultaneously, effectively prevent many cover cleaning equipments and use the object that just can reach and remove multiple harmful substances in flue gas simultaneously; Especially the art of this patent, at baking flue gas cooling process, the O that compressed air blasts 2can react with NO and generate NO 2and N 2o 4, the NO of generation 2and N 2o 4in absorption dust-removing process subsequently, effectively can be absorbed by calcium hydroxide.This baking flue gas comprehensive adsorption desulfurize dust-removing and purifying method technique and device technique advanced person, reliably, automatic controlling level is high, effectively can reduce daily production run cost, economical rationality, remove harmful material in smoke efficiency high, kind is many, and smoke emissioning concentration is better than the existing discharge standard of country.
Accompanying drawing explanation
Fig. 1 is process flow diagram of the present invention.
In Fig. 1: 1 flue, 2 valves, 3 spray columns, 4 fresh hydrooxidation calcium material bins, 5 fresh hydrooxidation calcium material-transporting systems, 6 sack cleaners, 7 return calcium hydroxide material bin, 8 adsorptive reactors, 9 recycle hydrogen calcium oxide conveying devices, 10 high pressure positive blowers, 11 return calcium hydroxide conveying device, 12 Pneumatic lifts, 13 air-introduced machines, 14 direct pipings, 15 chimneys.
Fig. 2 is spray column schematic diagram.
In Fig. 2: 21 temperature sensors, 22 water pumps, 23 compressed air, 24 water lines, 25 spray guns.
Fig. 3 is adsorptive reactor schematic diagram.
In Fig. 3: 31 adsorptive reactor housings, 32 charging gears, 33 absorption material fluidization equipments, 34 adsorptive reactors.
Fig. 4 is fresh hydrooxidation calcium feed induction system schematic diagram.
In Fig. 4: 41 feed valve door gears, 42 feeding control devices, 43 Weighing devices, 44 pneumatic chutes, 45 control feed valve.
Fig. 5 is recycle hydrogen calcium oxide induction system schematic diagram.
In Fig. 5: 51 charging gears, 52 pneumatic chutes, 53 by-pass valve controls.
Fig. 6 returns calcium hydroxide material-transporting system schematic diagram.
In Fig. 6: 61 charging gears, 62 Pneumatic lifts, 63 hand control valves, 64 roots blowers.
Detailed description of the invention
Below in conjunction with drawings and Examples, further explanation is explained to this patent.But the protection domain of this patent is not limited to concrete embodiment.
Embodiment 1
As shown in Figure 1, the baking flue gas comprehensive adsorption desulfurize dust-removing and purifying method technique of this patent, baking furnace fume is made to enter cooling down in spray column 3 by 13 air-introduced machine suction, cooled flue gas enters adsorptive reactor 8 and fully mixes and adsorption reaction harmful substance with calcium dihydroxide powders, enter bagroom 6 again and carry out gas-solid mixture separation, give off clean gas, the calcium hydroxide adsorbing nuisance is separated with calcium hydroxide, calcium hydroxide utilizes again through 9 recycle hydrogen calcium oxide conveying device circulations, calcium hydroxide containing adsorbate is collected and is delivered to Pneumatic lift 12 through 11 recycle hydrogen calcium oxide conveying devices, by gas by mass transport to returning calcium hydroxide material bin 7, as calcining desulfurizing agent or basic unit's thing of repairing the roads for subsequent use.
Shown in Fig. 2, baking furnace fume enters spray column from flue, spray column is imported and exported flue and is provided with temperature sensor 21, spray column top is provided with spray gun 25, when temperature sensor provides signal, water pump 22 near spray column starts, water to mix with compressed air 23 through pipeline 24 and is sprayed by spray tip, automatically spray gun water yield size is controlled by PLC control system, roaster high-temperature flue-gas is made to drop to design temperature, and water is mixed with flue gas after spray column, form spray pattern to enter spray column rear end flue, avoid a large amount of aqueous vapor to enter back-end system and corrosion and interference are caused to back-end system.
As shown in Figure 3, when flue gas is after spray column 33 cools, enter the reactor shell 31 on flue, use the calcium dihydroxide powders in calcium hydroxide feed bin, and the circulation calcium dihydroxide powders separated of cloth bag be adsorbent by charging gear 32 under the compressed-air actuated effect of fluidization equipment 33, enter that adsorptive reactor 34 fully mixes with the flue gas in adsorptive reactor 34, adsorption reaction harmful substance rapidly and uniformly.Fluidization equipment effectively can improve calcium hydroxide and add fashionable uniformity, guarantee that in adsorptive reactor, flue gas contacts with the comprehensive of calcium hydroxide, adsorptive reactor can use conventional in the market VRI reactor, venturi reactor, ring type upstream injection high efficiency reactor, gravity upstream injection reactor, fluidized-bed reactor etc.
As shown in Figure 4, calcium hydroxide material get rid of in feed bin after through charging gear 41, under the metering of Weighing device 43, conveying calcium hydroxide amount size is regulated by it by feeding control device 42, and be transported in adsorptive reactor by pneumatic chute 44 uniformly, install between pneumatic chute 44 and adsorptive reactor and control feed valve by 5, control the uniformity entering calcium hydroxide in each adsorptive reactor.
As shown in Figure 5, the adsorbate calcium hydroxide that contains after gas-solid mixture solid separating and filtering passes through the charging gear 51 be arranged on dust collector ash hopper, under the effect of pneumatic chute 52, be transported in adsorptive reactor charging gear by by-pass valve control 53, absorption and reaction are participated in circulation.
As shown in Figure 6, contain hazardous substance flue gas after calcium hydroxide absorption, containing the calcium hydroxide of adsorbate, soot dust granule and flue gas enter sack cleaner and carry out gas solid separation filtration, clean flue gas after filtration, purification through air-introduced machine directly by smoke stack emission, sack cleaner ash bucket inner filtration solid residue out returns calcium hydroxide through charging gear 61 containing what want pest, be transported to Pneumatic lift 62, under the control of manually-operated gate 63, material lifting power is provided by roots blower 64, by Pneumatic lift will return calcium hydroxide be delivered to return calcium hydroxide material bin store, as calcining desulfurization or basic unit's thing of repairing the roads for subsequent use.
The comprehensive adsorption desulfurize dedusting and purifying device of baking flue gas, comprise the flue l connecting roaster, valve 2, spray column 3, adsorptive reactor 8, sack cleaner 6, air-introduced machine 13, fresh hydrooxidation calcium induction system 5, return calcium hydroxide conveying device 11, Pneumatic lift 12, cyclic oxidation aluminium conveying device 9, automatic control system, air blast 10, calcium hydroxide material bin etc., the outlet of baking furnace fume is connected with spray column 3 by fume ducts 1, under the effect of air-introduced machine 13 suction, from the dust-laden of roaster, fluorine-containing, containing tar, acid gas-containing flue gas enters spray column 3, spray column import flue is provided with temperature sensor, spray column is provided with spray system, shower nozzle is controlled with temperature automatic spray by PLC, by the switch of PLC Control Nozzle, auto-adjustment control water yield size, spray column outlet is connected with adsorptive reactor 8 housing by pipeline, import and export on flue at spray column and be provided with temperature sensor, if when the temperature of spray column outlet is higher than setting value, cloth bag is burnt for preventing the too high sack cleaner that enters of baking furnace fume temperature, automatic decision is regulated water pump injection flow rate by PLC, to reduce the temperature of flue gas, or the valve opened on straight-through pipeline, flue dust enters straight-through flue 14 and is discharged by chimney, when spray column inlet temperature be greater than spray column inlet temperature setting value, cleaning system is considered as catching fire in pipeline, sensor automatically provides signal enabling spray column water pump by PLC or strengthens water pump injection flow rate, send sound and light alarm and the valve of closedown spray column tower import simultaneously, open the valve of straight-through flue simultaneously, flue gas is directly discharged, to guarantee total system safety through chimney from straight-through flue, flue dust after spraying cooling cooling enters in the housing of adsorptive reactor, and the shell body of adsorptive reactor is connected with flue, fully can mix, Adsorption of fluoride, tar, dust, SO in flue dust uphill process with the calcium hydroxide powder added 2, NO xetc. harmful substance, adsorptive reactor is provided with calcium hydroxide charge door and recycle hydrogen calcium oxide charge door, and reactor charge door lower end is provided with fluidization equipment, under the effect of compressed air fluidization equipment, makes the evenly ejections fast such as calcium hydroxide, pulse valve compressed air blowback system sack cleaner is equipped with, autocontrol valve, differential pressure ash-removing system, accumulation in time, getting more and more containing nuisance calcium hydroxide and exhaust gas dust of filter bag surface, add equipment resistance and produce large differential pressure, PLC is fed back to by pressure difference signal, when pressure drop is greater than setting value, PLC sends instruction, compressed air blowback pulse valve carries out deashing successively to cloth bag, filter bag moment undergoes rapid expansion is made under compressed-air actuated effect, to remove the dust on filter bag surface, make to fall in ash bucket containing the calcium hydroxide of nuisance and exhaust gas dust, flue gas after purification is by being connected to the air-introduced machine of sack cleaner back segment through smoke stack emission air.Sack cleaner ash bucket connects charging gear and recycle hydrogen calcium oxide induction system is connected with reactor; Sack cleaner ash bucket is connected with Pneumatic lift with pneumatic chute through charging gear, Pneumatic lift with return calcium hydroxide feed bin and be communicated with.
This technological process is simple, take up an area little, small investment, energy consumption is low, and a set of equipment can remove the multiple harmful substances in flue gas simultaneously, avoids repeatedly to use distinct device to carry out the investment waste of each pollutant removal to flue gas and place takies waste, to first flue gas purification thoroughly, do not produce secondary pollution, adsorbent calcium hydroxide recycling can be reclaimed simultaneously, effectively prevent many cover cleaning equipments and use the object that just can reach and remove harmful substances from flue gases simultaneously.Especially the technology of this patent, at baking flue gas cooling process, NO also can react further and generate NO 2, the NO of generation 2in absorption dust-removing process subsequently, effectively can be absorbed by calcium hydroxide.
Concrete implementation result:
The flue gas of certain carbon element factory's roaster generation as described in Example 1, after testing, containing harmful substances such as nitrogen oxide, sulfide, fluorides, wherein, amount of nitrogen oxides is 185mg/m 3, content of sulfur dioxide is 238mg/m 3, fluoride is 33mg/m 3, tar content 330mg/m 3.
Add the baking flue gas adsorption desulfurize udst separation PROCESS FOR TREATMENT of calcium hydroxide as adsorbent through adopting, but do not use electrical tar precipitator, calcium hydroxide use amount is identical with baking flue gas rate of discharge, and it is 55mg/m that emission gases reaches amount of nitrogen oxides 3, content of sulfur dioxide is 85mg/m 3, fluoride is 2.8mg/m 3, tar content 10mg/m 3.
Comparative example 1
The flue gas that certain carbon element factory's roaster produces, after testing, containing harmful substances such as nitrogen oxide, sulfide, fluorides, wherein, amount of nitrogen oxides is 178mg/m 3, content of sulfur dioxide is 340mg/m 3, fluoride is 35mg/m 3, tar content 336mg/m 3.
Add the baking flue gas adsorption desulfurize udst separation PROCESS FOR TREATMENT of aluminium oxide as adsorbent through adopting, it is 171mg/m that emission gases reaches amount of nitrogen oxides 3, content of sulfur dioxide is 312mg/m 3, fluoride is 2.0mg/m 3, tar content 9mg/m 3.
Comparative example 2
The flue gas that certain carbon element factory's roaster produces, after testing, containing harmful substances such as nitrogen oxide, sulfide, fluorides, wherein, amount of nitrogen oxides is 178mg/m 3, content of sulfur dioxide is 340mg/m 3, fluoride is 35mg/m 3, tar content 336mg/m 3.
Add the baking flue gas adsorption desulfurize udst separation PROCESS FOR TREATMENT of aluminium oxide as adsorbent through adopting, it is 171mg/m that emission gases reaches amount of nitrogen oxides 3, content of sulfur dioxide is 310mg/m 3, fluoride is 2.0mg/m 3, tar content 8mg/m 3.

Claims (6)

1. baking flue gas comprehensive adsorption desulfurize dust-removing and purifying method technique, is characterized in that: comprise following process:
(1), baking flue gas cooling process: make flue gas enter spray column with the suction that air-introduced machine produces, water is driven by water pump, mixes with compressed air through pipeline, is sprayed by spray tip, automatically control spray gun water yield size by PLC control system, make roaster high-temperature flue-gas drop to design temperature;
(2), dust-removing process is adsorbed:
Baking flue gas after hydrogen cooling enters adsorptive reactor, calcium dihydroxide powders discharge in feed bin after after charging gear, under the metering of Weighing device, regulate conveying calcium hydroxide amount size by feeding control device, be more evenly transported in adsorptive reactor through pneumatic chute under compressed-air actuated effect;
Calcium dihydroxide powders, in adsorptive reactor, becomes fluidisation state, fully mix with the high flow rate flue gas oppositely entered contact, react, adsorption, remove the nuisance tar in flue gas, HF, SO 2, NO x, dust;
(3), bag-type dust operation:
Contain hazardous substance flue gas in adsorptive reactor through calcium hydroxide absorption after, enter sack cleaner containing the calcium hydroxide of adsorbate, soot dust granule and flue gas and carry out gas solid separation filtration, clean flue gas after filtration, purification is through air-introduced machine directly by smoke stack emission, and sack cleaner ash bucket inner filtration solid residue is out delivered to calcium hydroxide material bin containing the calcium hydroxide being adsorbed with nuisance and stores.
2. baking flue gas comprehensive adsorption desulfurize dust-removing and purifying method technique according to claim 1, it is characterized in that: described is provided with import smoke pipe in spray column import, keep away in spray column and do acid and alkali-resistance preservative treatment, import flue hypomere tower body installs a set of spray equipment, harmful substance in flue gas is rinsed, lowered the temperature, tower body is provided with smoke evaporative condensation segment, the structure of condensation segment needs to ensure that flue gas fully mixes with water liquid, contacts, reacts, be with water rate to be less than 1% in spray column exiting flue gas, and water exist with flue gas with steam state form.
3. baking flue gas comprehensive adsorption desulfurize dust-removing and purifying method technique according to claim 1, is characterized in that: between pneumatic chute and reactor, be provided with control feed valve, controls to enter the uniformity of calcium hydroxide in each reactor by controlling feed valve.
4. baking flue gas comprehensive adsorption desulfurize dust-removing and purifying method technique according to claim 1, is characterized in that: described adsorptive reactor is VRI reactor, venturi reactor, ring type upstream injection high efficiency reactor, gravity upstream injection reactor or fluidized-bed reactor.
5. baking flue gas comprehensive adsorption desulfurize dust-removing and purifying method technique according to claim 1, it is characterized in that: the described calcium hydroxide containing being adsorbed with pest is delivered to via Pneumatic lift and returns calcium hydroxide material bin and store, as calcining desulfurization or basic unit's thing of repairing the roads for subsequent use.
6. baking flue gas comprehensive adsorption desulfurize dust-removing and purifying method technique according to claim 1, it is characterized in that: described absorption dedusting reactor outlet pipe is connected to sack cleaner inlet pipeline, sack cleaner is provided with dusty gas filter cloth bag and deashing device, sack cleaner outlet is provided with flue, is connected with blower fan and chimney; Bagroom bottom is provided with powder ash bucket, in ash bucket, deposition is delivered to reactor continuation reaction containing a nuisance calcium dihydroxide powders part by the charging gear that ash bucket is installed and circulation transporting chute, a part is delivered to by the charging gear that ash bucket is installed and returns transporting chute and be delivered to Pneumatic lift, will be delivered to return calcium hydroxide material bin and be in store for by Pneumatic lift containing nuisance calcium dihydroxide powders.
CN201510689406.XA 2015-10-23 2015-10-23 Comprehensive adsorption and desulphurization dedusting purification method of baking flue gas Pending CN105396421A (en)

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CN112275058A (en) * 2020-10-19 2021-01-29 昆岳互联环境技术(江苏)有限公司 Ammonia-free desulfurization and denitrification system and desulfurization and denitrification method

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