CN107051072A - A kind of method and device using useless alkaline sewage desulfurization and dedusting - Google Patents

A kind of method and device using useless alkaline sewage desulfurization and dedusting Download PDF

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Publication number
CN107051072A
CN107051072A CN201611033292.4A CN201611033292A CN107051072A CN 107051072 A CN107051072 A CN 107051072A CN 201611033292 A CN201611033292 A CN 201611033292A CN 107051072 A CN107051072 A CN 107051072A
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China
Prior art keywords
water
liquid
vapour
steam
alkaline sewage
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CN201611033292.4A
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Chinese (zh)
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朱冰
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Jiangsu Maritime Institute
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Jiangsu Maritime Institute
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Priority to CN201611033292.4A priority Critical patent/CN107051072A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
    • B01D50/40—Combinations of devices covered by groups B01D45/00 and B01D47/00
    • 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
    • B01D53/46—Removing components of defined structure
    • B01D53/48—Sulfur compounds
    • B01D53/50—Sulfur oxides
    • B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
    • B01D53/502—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific solution or suspension
    • 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
    • B01D53/46—Removing components of defined structure
    • B01D53/48—Sulfur compounds
    • B01D53/50—Sulfur oxides
    • B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
    • B01D53/504—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific device
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • B01D2258/0283—Flue gases

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

Abstract

The present invention relates to a kind of method and device using useless alkaline sewage desulfurization and dedusting, comprise the following steps：A, flue gas cool-down；B, multistage vapour-liquid are mixed；C, two grades of steam-water separations；D, depth vapour-liquid are mixed；E, two grades of steam-water separations.The method that the present invention mixes again steam-water separation using vapour-liquid, makes the SO in flue gas2Fully contacted with useless alkaline sewage with flue dust, improve the speed of desulfurization and dedusting, repeating for two grades of steam-water separations, SO in tail gas are mixed again through depth vapour-liquid2More than 90% is reached with flue dust clearance.The present invention carries out desulfurization and dedusting using useless alkaline sewage, and technique is simple, and device controllability is good, stable, energy-conserving and environment-protective, useless to abolish, and is adapted to promote.

Description

A kind of method and device using useless alkaline sewage desulfurization and dedusting
Technical field
The present invention relates to the field that waste material is utilized, and in particular to a kind of side using useless alkaline sewage desulfurization and dedusting Method and device.
Background technology
With flourishing for industry, atmosphere pollution is increasingly in an emergency, and haze acid rain turns into the everyday topics of the common people.Air Pollution is increasingly severe, during a series of desulfurization dust-removing technique, it is necessary to SO2, dust from coal-burning boiler waste gas discharge In remove out by chemically and physically process, and be not discharged into air, sewage also do not produced again, is just avoided that and environment is caused Pollution.Coal-burning boiler it is general before air-introduced machine by simply handling or the desulfurization dust-removing technique, SO such as cellular water dust scrubber2 It is relatively low with flue dust removal efficiency, it is impossible to reach emission request.
Sub- sodium round-robin method flue gas desulfurization is absorption and regeneration cycle process using sodium sulfite solution by the SO in flue gas2 Removing, achieves the goal.Using the absorption and regeneration cycle process of sodium sulfite solution by the SO in flue gas2The method of removing, by U.S.'s Weir is graceful --- and Lord Corp. creates, and Weir is graceful --- and Luo Defa uses NaCO3Or NaOH is as absorbent when starting, SO is absorbed at low temperature2, it is referred to as sub- sodium round-robin method, desulfurization degree more than 90%, but the method has side reaction generation in absorption process Na2SO4, the expensive of it is removed, device power consumption is big, and consumes commodity NaCO3Or NaOH amounts are larger.
Lime stone --- gypsum wet flue gas desulfurizing technology, commonly used at present, effect is obvious.But except equipment investment Greatly, floor space is big, desulfurization product --- gypsum is to force oxidation lime stone --- logical by-product of gypsum wet flue gas desulfurizing system Thing.Divided at present by the disposal options of desulfurizing byproduct gypsum and abandon and recycle, abandoning disposal needs landfill, need to store heap The place put and the isolation of landfill, draining, antiseep etc. are built, and market are recycled at present close to saturation, to source in production The generation of the continuous accessory substance gypsum in source, prospect does not see everything through rose-coloured spectacles.
The content of the invention
It is an object of the invention to provide a kind of efficiency high, good separating effect, technique is simple, device controllability is good, energy-saving ring The desulfurization and dust-removal method and device of guarantor.
To reach above-mentioned purpose, the technical scheme that the present invention is provided is：
A kind of method using useless alkaline sewage desulfurization and dedusting, comprises the following steps：
A, flue gas cool-down：Install waste-heated water-tank additional after economizer, flue-gas temperature is declined 20~30 DEG C, through cellular moisture film After the preliminary desulfurization and dedusting of deduster, flue-gas temperature declines again；
B, multistage vapour-liquid are mixed：Flue gas enters the multistage vapour-liquid in spray type desulphurization dust removal cylinder bottom through air-introduced machine and mixes area, leads to Cross by useless alkaline sewage desulfurization spray after desulfurization introducing port, then the big flow alkalescence without the detachable spray group in dead angle is dirty through first Water countercurrent spray, makes the SO in flue gas2Drastically decline through fully contact with flue dust, while flue-gas temperature also declines, summer 65 ~70 DEG C, 40~45 DEG C of winter, less than 83 DEG C of the boiling point of nitric acid；
C, two grades of steam-water separations：The flue gas mixed due to multistage vapour-liquid in area carries higher vaporific steam, passes through first Two grades of steam-water separation areas, under the centrifugal action of rotary-cut, the water droplet of larger particles is promptly released, and microparticle is affine through colliding Separated out simultaneously with drop into little particle；
D, depth vapour-liquid are mixed：Using the high Pall ring filler layers of 2.5M in depth vapour-liquid mixed zone, change gas flow, Increase the time of contact of inversely spraying liquid, alkaline sewage is through without the detachable mouth spray in dead angle countercurrent spray again, making in flue gas Remaining SO2Drastically decline through fully contact with flue dust, flow of flue gas is stable；
E, two grades of steam-water separations：Behind depth vapour-liquid mixed zone, into the two or two grade of steam-water separation area, water droplet, micro- Grain is affine through colliding again, is rapidly separated under the centrifugal action of rotary-cut, flue gas is sufficiently cleaned up, flue-gas temperature is because of spray liquid stream Move and constantly reduce, 60~65 DEG C of exhaust temperature summer, 35~40 DEG C of winter, it is therefore prevented that the free oxygen in water is separated out.
In step a, give up alkaline sewage NaCO3Or NaOH is sprayed from the following current of cellular water dust scrubber upper body and injected, and is opened Smoke absorption agent during the beginning, absorbs SO at low temperature2Generate Na2SO3, Na2SO3Reservoir, thick of part are mixed into useless alkaline sewage Grain flying dust is taken out of, desulfurization degree 40%, 90 DEG C of flue-gas temperature.
In step b, when flue gas after desulfurization introducing port by useless alkaline sewage desulfurization by being sprayed, due to being removed in spray type desulphurization Small, upper two big outlets, make bottom stockpile the alkaline solution of osculum diameter height all the time, serve bottom under dirt cup lower disposed Portion's hip bath, which is splashed, mixes effect.
A kind of device using useless alkaline sewage desulfurization and dedusting, including economizer, waste-heated water-tank, cellular water dust scrubber With spray type desulphurization dust removal cylinder, described spray type desulphurization dust removal cylinder lower end is provided with desulfurization introducing port；Described economizer passes through Flue is sequentially connected after waste-heated water-tank, cellular water dust scrubber, and flue gas enters described desulfurization through air-introduced machine and imported Mouthful；The described useless alkaline sewage of cellular water dust scrubber connection mixes reservoir；Include in described spray type desulphurization dust removal cylinder many Level vapour-liquid mixes area, depth vapour-liquid mixed zone, two without the detachable spray group and Liang Geerji steam-water separations area (dash in dead angle Cap), it is described to mix reservoir without the detachable useless alkaline sewage of spray group connection in dead angle；Described multistage vapour-liquid is mixed to be provided with area First without the detachable spray group in dead angle, described first without above the detachable spray group in dead angle provided with the one or two grade of carbonated drink point It is depth vapour-liquid mixed zone above the one or two grade of described steam-water separation area, described depth vapour-liquid mixed zone is by Bauer from area Ring filler layer and second is without the detachable mouth spray composition in dead angle, and described depth vapour-liquid mixed zone top is provided with the two or two grade of vapour Water Disengagement zone.
It is described without the detachable spray group in dead angle be comb position, the mouth spray of spiral nozzle annular spread；Described Two grades of steam-water separation areas are guide plate separator using centrifugal force, and left-handed 30 ° of described guide plate is left-leaning 10 °.
The multistage vapour-liquid mix area include adverse current without the detachable spray group in dead angle, desulfurization introducing port and bottom hip bath Small, upper big two outlets, make bottom stockpile osculum diameter height all the time under splash zone, spray type desulphurization dust removal cylinder lower disposed Alkaline solution, plays bottom hip bath splashing and mixes effect.
Described spray type desulphurization dust removal its cylinder material of cylinder is that granite anticorrosive coat is built in A3 steel, cylinder, and outer layer is ring Oxygen tree fat glass steel；Two grades of steam-water separation area materials are 316L stainless steels.
In the present invention, the spray type desulphurization dust removal cylinder bottom multi-stage gas-liquid, which is mixed in area, to be provided with without the detachable spray in dead angle Drench group, it is ensured that Na2SO3, useless alkalies be uniformly distributed in cylinder, easy cleaning is blocked.
Further, it is described without two grades of steam-water separation areas (water stopping cap) are provided with above the detachable spray group in dead angle, it can divide The drop carried secretly in separable flue gas, and form complete spray desulfurization, dedusting, steam-water separation handling process.
Further, because flue-gas temperature is less than 80 DEG C, the sulphur in flue gas forms sulfurous acid, is easy to salkali waste through condensation Sewage liquid liquid is mixed.
Further, the spray type desulphurization dust removal cylinder middle part depth gas-liquid mixes area and is equipped with Pall ring filler floor, can have Gas pulsation is prevented to effect, is reached stable.
Further, the depth gas-liquid mixes area top provided with row of two grades of steam-water separation areas (water stopping cap) to tail gas Remove, last time serves sufficiently cleaned up.
Further, the coefficient of excess air in control boiler combustion, is rationally adjusted to burning, card goods yard, keeps burner hearth to bear - 20~25pa is pressed, flue gas short circuit is prevented, improves operation level to control the oxygen content in flue gas, scale value is torn in reduction open.
The present invention utilizes the sewage of useless sodium hydroxide or sodium carbonate to be used for coal burning flue gas desulfurization dedusting, it is adaptable to print and dye 20T/H and following steam boiler and YLW -14000MA (12,000,000 kilocalorie) and following organic heat in industry, chemical industry, pharmaceutical industry Carrier coal-fired flue gas desulfurization dedusting.By installing waste-heated water-tank additional, flue-gas temperature is less than 83 DEG C of nitric acid boiling point, the sulphur condensation in flue gas Sulfurous acid is formed, good desulfurization condition is created, and effectively prevent the wash-off of the free oxygen in water, therefore is significantly improved de- Sulphur rate.It is evenly distributed and the spray liquid of larger flow simultaneously effective reduces particulate matter in flue gas.The useless of the method controls useless, is The ideal measure that sewage separation, classification are administered.It is stable, simple, efficient, daily improvement cost free or micro- cost.This law is fitted Desulfurization and dedusting for newly-built or built boiler is transformed.
The method is sewage separation, the continuation of classification improvement, it may also be said to utilize the sulfur dioxide reduction spent lye in flue gas Concentration, adjusted with the pH value of sharp follow-up sewage air-flotation technique.Therefore the method is applied to the enterprise for having sewage disposal and pretreatment, and It is simple in construction, effective.Desulfurization degree is up to more than 90%.Because spent lye is used for desulfurization, therefore enterprise is in waste water control in spent lye It can be saved with the technique of processing, while the expense of saving.
Brief description of the drawings
Fig. 1：Present invention process device flow chart.
Embodiment
With reference to specific embodiment, the invention will be further described.
A kind of device using useless alkaline sewage desulfurization and dedusting, including economizer 3, waste-heated water-tank 2, cellular water film dedusting Device 4 and spray type desulphurization dust removal cylinder 1, described 1 lower end of spray type desulphurization dust removal cylinder are provided with desulfurization introducing port 10；Described province's coal Device 3 is sequentially connected after waste-heated water-tank 2, cellular water dust scrubber 4 by flue, and flue gas enters described through air-introduced machine 17 Desulfurization introducing port 10；In described spray type desulphurization dust removal cylinder 1 include multistage vapour-liquid mix area 5, depth vapour-liquid mixed zone 8, Two without the detachable spray group in dead angle and Liang Geerji steam-water separations area (water stopping cap).It is described without the detachable spray in dead angle The useless alkaline sewage of group's connection mixes reservoir.
Described multistage vapour-liquid is mixed in area 5 provided with first without the detachable spray group 6 in dead angle, and described first without dead angle The detachable top of spray group 6 is deep provided with the one or two grade of steam-water separation area 7, the described top of the one or two grade of steam-water separation area 7 Spend vapour-liquid mixed zone 8, described depth vapour-liquid mixed zone is by Pall ring filler layer and second without the detachable mouth spray 11 in dead angle Composition, the described top of depth vapour-liquid mixed zone 8 is provided with the two or two grade of steam-water separation area 9.
Described useless first alkaline sewage of the connection of cellular water dust scrubber 4 mixes reservoir 12.Described first can without dead angle Useless first alkaline sewage of detachable spray group's connection mixes reservoir 12, and described second without the detachable spray group connection second in dead angle Useless alkaline sewage mixes reservoir 13, and the first described alkaline sewage mixes reservoir 12 provided with the mixed storage of the useless alkaline sewage of infusion pump 15, second Pond 13 is provided with infusion pump 16.
It is described without the detachable spray group in dead angle be comb position, the mouth spray of spiral nozzle annular spread；Described Two grades of steam-water separation areas are guide plate separator using centrifugal force, and left-handed 30 ° of described guide plate is left-leaning 10 °.
The multistage vapour-liquid mix area include adverse current without the detachable spray group in dead angle, desulfurization introducing port and bottom hip bath Small, upper big two outlets, make bottom stockpile osculum diameter height all the time under splash zone, spray type desulphurization dust removal cylinder lower disposed Alkaline solution, plays bottom hip bath splashing and mixes effect.
Described spray type desulphurization dust removal cylinder 1 connects sedimentation basin 14.
Described spray type desulphurization dust removal 1 its cylinder material of cylinder is that granite anticorrosive coat is built in A3 steel, cylinder, and outer layer is ring Oxygen tree fat glass steel；Two grades of steam-water separation area materials are 316L stainless steels.
A kind of method and device using useless alkaline sewage desulfurization and dedusting, comprises the following steps：
1st, sodium sulfite is produced, by the useless alkaline sewage NaCO in part3Or NaOH is from the cellular upper body following current of water dust scrubber 4 Spray injection, absorbent when making to start absorbs SO at low temperature2, while generating Na2SO3, Na2SO3It is mixed into useless alkaline sewage Reservoir 12, part coarse granule flying dust are taken out of, desulfurization degree 40%, 90 DEG C of flue-gas temperature.
SO2Absorb：
2NaOH+SO2=Na2SO3+H2O
Na2CO3+SO2=Na2SO3+CO2
2nd, multi-stage gas-liquid is mixed.Contain Na2SO3The first useless alkaline sewage mix alkali lye in reservoir 12 through infusion pump Under 150.25~0.3Mpa pressure, importing is injected separately into without the detachable spray group 6 in dead angle by 90 ° of spiral nozzles, first Mouth 10, multi-stage gas-liquid mixed zone 5, flue gas are mixed through the desulfurization of introducing port 10, and it is detachable without dead angle that bottom hip bath splashes to first Spray the countercurrent spray of group 6, Na2SO3SO is absorbed at low temperature2, generate NaHSO3(main) and Na2S2O5(unstable), completes spray The first step major function of pouring formula desulfurization and dedusting cylinder 1, flue-gas temperature drops to 65~70 DEG C of summer, and in 40~45 DEG C of winter, desulfurization is removed Dirt efficiency respectively reaches 90%.
Incipient stage：
Na2SO3+SO2+H2O=2NaHSO3(main)
Na2SO3+SO2=Na2S2O5(unstable)
Due to having O in flue gas in course of reaction2, part Na2SO3Na will be oxidized to2SO4(part constantly discharge)
Na2SO3+1/2O2=Na2SO4(oxidation side reaction generation)
With Na2SO3It is changed into NaHSO3And Na2S2O5The progress of process, the pH value of solution will be gradually reduced, and work as absorbing liquid In pH value drop to (i.e. Na to a certain degree2SO3Reduce to a certain extent) when, the absorbability reduction of solution, under absorptivity starts Drop, the Na of oxidation side reaction generation2SO4Increase, works as Na2SO4When content reaches 4~5%, it is necessary to exclude a part of mother liquor to heavy Shallow lake pond 14, overflow decontaminated water regulating reservoir.The method must assure that fresh useless NaOH or NaCO3Alkaline sewage is continuously mended Fill.Useless more than alkaline sewage pH12, the flow of infusion pump 15 can be controlled in 80M3/ H, such as useless alkaline sewage pH10~12, then should add The flow of big infusion pump 15, should reach 100M per hour3/ more than H, the power of infusion pump 15 is respectively in 15~18.5KW.
3rd, two grades of steam-water separations.Flue gas rises naturally, and flow direction is changed by the one or two grade of steam-water separation area 7 bottom, Under the centrifugal action of rotary-cut, drop is rapidly separated, and microparticle is affine into little particle through colliding, and is separated out simultaneously with drop, thoroughly Enter sedimentation basin 14.
4th, depth gas-liquid is mixed.Flue gas continues to rise, and is mixed into the depth gas-liquid being made up of polypropylene Pall ring filler layer Area 8 is closed, while by containing Na2SO3The second useless alkaline sewage mix alkali lye in reservoir 13 through infusion pump 16 in 0.25~0.3Mpa Pressure under, by second, without the detachable mouth spray 11 in dead angle, countercurrent spray shape injects depth gas-liquid mixed area 8, flue gas again Middle remaining SO2Drastically decline through the fully contact of polypropylene Pall ring filler layer with flue dust.Technological principle is mixed with multi-stage gas-liquid Area 5, by the one or the two grade of top of steam-water separation area water stopping cap 7, reservoir is mixed except partial mother liquid reuse penetrates the second useless alkaline sewage Outside 13, it is necessary to discharge a part of mother liquor to sedimentation basin 14, overflow decontaminated water regulating reservoir, while continuously supplementing fresh give up Alkaline sewage.
5th, two grades of steam-water separations.Flue gas rises again, by the two or two grade of steam-water separation area water stopping cap 9, continues to change cigarette Flow of air direction, under the centrifugal action of rotary-cut, drop is rapidly separated, and the salkali waste after area 8 works is mixed with depth gas-liquid Liquid penetrates the second useless alkaline sewage and mixes reservoir 13, and by the two or two grade of steam-water separation area water stopping cap 9, flue gas is sufficiently cleaned up.SO2With Flue dust clearance is up to more than 90%.60~65 DEG C of tail gas concentration summer, 35~40 DEG C of winter, it is therefore prevented that the free oxygen analysis in water Go out.
Shanghai Inst of Industrial Boiler's mechanical industry boiler and environment-friendly products quality surveillance inspection center are entrusted to the present invention The device of useless alkaline sewage desulfurization and dedusting detected, detection project and instrument and testing result such as table 1-5.
Table 1
Table 2
Test result
1st, boiler Air Pollutant Emission
Project Unit Numerical value
Flue gas lingemann blackness Level ＜ 1
Equipment importation converts smoke dust discharge concentration mg/Nm3 258.12
Equipment outlet conversion smoke dust discharge concentration mg/Nm3 11.02
Equipment importation converts SO2Concentration of emission mg/Nm3 38.17
Equipment outlet conversion SO2Concentration of emission mg/Nm3 2.93
Equipment importation converts NOx emission concentration mg/Nm3 313.21
Equipment outlet conversion NOx emission concentration mg/Nm3 147.50
2nd, efficiency of dust collection, desulfuration efficiency, denitration efficiency
Project Unit Numerical value
Efficiency of dust collection % 95.73
Desulfuration efficiency % 92.32
Denitration efficiency % 52.91
Table 3
Table 4
Table 5
It is described above, only it is presently preferred embodiments of the present invention, any formal limitation not is made to the present invention, it is any ripe Professional and technical personnel is known, it is without departing from the scope of the present invention, real to more than according to the technical spirit of the present invention Apply any simple modification, equivalent substitution that example made and improve etc., still fall within technical solution of the present invention protection domain it It is interior.

Claims (10)

1. a kind of method using useless alkaline sewage desulfurization and dedusting, it is characterised in that：Comprise the following steps：
A, flue gas cool-down：Install waste-heated water-tank additional after economizer, decline flue-gas temperature, tentatively taken off through cellular water dust scrubber After sulphur dedusting, flue-gas temperature declines again；
B, multistage vapour-liquid are mixed：Flue gas enters the multistage vapour-liquid in spray type desulphurization dust removal cylinder bottom through air-introduced machine and mixes area, by de- Sprayed after sulphur introducing port by useless alkaline sewage desulfurization, then the big flow alkaline sewage without the detachable spray group in dead angle is inverse through first Stream spray, makes the SO in flue gas2Drastically decline through fully contact with flue dust, while flue-gas temperature also declines；
C, two grades of steam-water separations：The flue gas mixed due to multistage vapour-liquid in area carries higher vaporific steam, passes through the one or two grade Steam-water separation area, under the centrifugal action of rotary-cut, the water droplet of larger particles is promptly released, and microparticle is affine into small through colliding Particle is separated out simultaneously with drop；
D, depth vapour-liquid are mixed：Using the height of the Pall ring filler layer in depth vapour-liquid mixed zone, change gas flow, increase The time of contact of inversely spraying liquid, the remaining SO in flue gas is made again2Drastically decline, flow of flue gas through fully contact with flue dust It is stable；
E, two grades of steam-water separations：Behind depth vapour-liquid mixed zone, into the two or two grade of steam-water separation area, water droplet, microparticle are again It is secondary affine through colliding, it is rapidly separated under the centrifugal action of rotary-cut, flue gas is sufficiently cleaned up, flue-gas temperature is because of spray liquid flowing Constantly reduction, it is therefore prevented that the free oxygen in water is separated out.
2. as claimed in claim 2 utilize useless alkaline sewage desulfation dust-extraction device, it is characterised in that：In step a, salkali waste is dirty Water NaCO3Or NaOH is sprayed from the following current of cellular water dust scrubber upper body and injected, smoke absorption agent when making to start, at low temperature Absorb SO2Generate Na2SO3, Na2SO3Reservoir, part coarse granule flying dust are mixed into useless alkaline sewage to take out of.
3. as claimed in claim 2 utilize useless alkaline sewage desulfation dust-extraction device, it is characterised in that：In step b, flue gas passes through When being sprayed after desulfurization introducing port by useless alkaline sewage desulfurization, due to it is small under spray type desulphurization dust removal cylinder lower disposed, on it is big Two outlets, make bottom stockpile the alkaline solution of osculum diameter height all the time, serve bottom hip bath splashing and mix effect.
4. a kind of device using useless alkaline sewage desulfurization and dedusting, it is characterised in that：Including economizer, waste-heated water-tank, cellular Water dust scrubber and spray type desulphurization dust removal cylinder, described spray type desulphurization dust removal cylinder lower end are provided with desulfurization introducing port；Described Economizer is sequentially connected after waste-heated water-tank, cellular water dust scrubber by flue, and flue gas enters described through air-introduced machine Desulfurization introducing port；Include multistage vapour-liquid in described spray type desulphurization dust removal cylinder and mix area, depth vapour-liquid mixed zone, two nothings The detachable spray group in dead angle and Liang Geerji steam-water separations area, it is described dirty without the detachable spray group connection salkali waste in dead angle Water mixes reservoir；Described multistage vapour-liquid, which is mixed, is provided with first without the detachable spray group in dead angle in area, described first without dead angle It is depth vapour above the one or two grade of described steam-water separation area provided with the one or two grade of steam-water separation area above detachable spray group Liquid mixed zone, described depth vapour-liquid mixed zone is made up of Pall ring filler layer and second without the detachable mouth spray in dead angle, institute Provided with the two or two grade of steam-water separation area above the depth vapour-liquid mixed zone stated.
5. as claimed in claim 4 utilize useless alkaline sewage desulfation dust-extraction device, it is characterised in that：Described cellular moisture film The useless alkaline sewage of deduster connection mixes reservoir.
6. as claimed in claim 4 utilize useless alkaline sewage desulfation dust-extraction device, it is characterised in that：Described is removable without dead angle It is comb positioning, the mouth spray of spiral nozzle annular spread to unload formula spray group；Two grades of described steam-water separation areas be guide plate from Mental and physical efforts separator.
7. as claimed in claim 4 utilize useless alkaline sewage desulfation dust-extraction device, it is characterised in that：The multistage vapour-liquid is mixed Area include adverse current without the detachable spray group in dead angle, desulfurization introducing port and bottom hip bath splash zone, spray type desulphurization dust removal cylinder Small under lower disposed, upper big two outlets, make bottom stockpile the alkaline solution of osculum diameter height all the time, play bottom hip bath and fly Splash mixing effect.
8. as claimed in claim 4 utilize useless alkaline sewage desulfation dust-extraction device, it is characterised in that：Described spray type desulphurization Except dirt cup connects sedimentation basin.
9. as claimed in claim 4 utilize useless alkaline sewage desulfation dust-extraction device, it is characterised in that：Described spray type desulphurization Except dirt cup, its cylinder material is that granite anticorrosive coat is built in A3 steel, cylinder, and outer layer is epoxy resin glass steel；Two grades of steam-water separation areas Material is 316L stainless steels.
10. as claimed in claim 4 utilize useless alkaline sewage desulfation dust-extraction device, it is characterised in that：Described Pall ring is filled out Bed depth is 2.5M.
CN201611033292.4A 2016-11-16 2016-11-16 A kind of method and device using useless alkaline sewage desulfurization and dedusting Withdrawn CN107051072A (en)

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Application publication date: 20170818