CN105477963A - Coal-fired boiler flue gas environmentally-friendly deep treatment method and apparatus - Google Patents
Coal-fired boiler flue gas environmentally-friendly deep treatment method and apparatus Download PDFInfo
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- CN105477963A CN105477963A CN201510865851.7A CN201510865851A CN105477963A CN 105477963 A CN105477963 A CN 105477963A CN 201510865851 A CN201510865851 A CN 201510865851A CN 105477963 A CN105477963 A CN 105477963A
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 47
- 239000003546 flue gas Substances 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000000428 dust Substances 0.000 claims abstract description 104
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 88
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 36
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 31
- 238000004062 sedimentation Methods 0.000 claims abstract description 23
- 239000007789 gas Substances 0.000 claims abstract description 15
- 238000000926 separation method Methods 0.000 claims abstract description 12
- 239000007921 spray Substances 0.000 claims abstract description 10
- 230000003647 oxidation Effects 0.000 claims abstract description 9
- 238000000889 atomisation Methods 0.000 claims abstract description 6
- 239000007788 liquid Substances 0.000 claims abstract description 5
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 claims abstract description 4
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 claims abstract description 4
- 238000010521 absorption reaction Methods 0.000 claims abstract description 4
- 229910001424 calcium ion Inorganic materials 0.000 claims abstract description 4
- 229910001425 magnesium ion Inorganic materials 0.000 claims abstract description 4
- 239000002351 wastewater Substances 0.000 claims abstract description 4
- 238000005406 washing Methods 0.000 claims description 25
- 239000003245 coal Substances 0.000 claims description 20
- 239000000779 smoke Substances 0.000 claims description 18
- 239000003517 fume Substances 0.000 claims description 17
- 230000003009 desulfurizing effect Effects 0.000 claims description 16
- 230000007613 environmental effect Effects 0.000 claims description 16
- 239000002956 ash Substances 0.000 claims description 14
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 8
- 238000011068 loading method Methods 0.000 claims description 7
- 239000008346 aqueous phase Substances 0.000 claims description 6
- 238000005352 clarification Methods 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 6
- 239000012535 impurity Substances 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 6
- 238000001556 precipitation Methods 0.000 claims description 5
- 238000005273 aeration Methods 0.000 claims description 4
- GBAOBIBJACZTNA-UHFFFAOYSA-L calcium sulfite Chemical compound [Ca+2].[O-]S([O-])=O GBAOBIBJACZTNA-UHFFFAOYSA-L 0.000 claims description 4
- 235000010261 calcium sulphite Nutrition 0.000 claims description 4
- 239000004071 soot Substances 0.000 claims description 4
- 239000002250 absorbent Substances 0.000 claims description 3
- 230000002745 absorbent Effects 0.000 claims description 3
- 230000001133 acceleration Effects 0.000 claims description 3
- 238000013459 approach Methods 0.000 claims description 3
- 230000008602 contraction Effects 0.000 claims description 3
- 238000007667 floating Methods 0.000 claims description 3
- 238000010008 shearing Methods 0.000 claims description 3
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 abstract description 16
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract description 12
- 238000006477 desulfuration reaction Methods 0.000 abstract description 10
- 230000023556 desulfurization Effects 0.000 abstract description 10
- 229910021529 ammonia Inorganic materials 0.000 abstract description 6
- 238000002156 mixing Methods 0.000 abstract description 6
- 239000012459 cleaning agent Substances 0.000 abstract 2
- 239000010438 granite Substances 0.000 abstract 1
- 239000013618 particulate matter Substances 0.000 abstract 1
- 150000003839 salts Chemical class 0.000 abstract 1
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 12
- 238000005516 engineering process Methods 0.000 description 10
- 235000011114 ammonium hydroxide Nutrition 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000010248 power generation Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 235000010269 sulphur dioxide Nutrition 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 230000006872 improvement Effects 0.000 description 4
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 3
- 235000019738 Limestone Nutrition 0.000 description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 3
- 230000005684 electric field Effects 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- 239000003500 flue dust Substances 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 239000006028 limestone Substances 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- BIGPRXCJEDHCLP-UHFFFAOYSA-N ammonium bisulfate Chemical compound [NH4+].OS([O-])(=O)=O BIGPRXCJEDHCLP-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- JGIATAMCQXIDNZ-UHFFFAOYSA-N calcium sulfide Chemical compound [Ca]=S JGIATAMCQXIDNZ-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003818 cinder Substances 0.000 description 1
- 239000010883 coal ash Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005367 electrostatic precipitation Methods 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 230000003134 recirculating effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000004291 sulphur dioxide Substances 0.000 description 1
Classifications
-
- 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
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
- B01D47/10—Venturi scrubbers
-
- 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
- B01D53/54—Nitrogen compounds
- B01D53/56—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
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/10—Oxidants
- B01D2251/11—Air
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Treating Waste Gases (AREA)
Abstract
The present invention provides a coal-fired boiler flue gas environmentally-friendly deep treatment method, dedusting, desulfurization and denitration deep treatment is performed on coal-fired boiler flue gas by a combined Venturi water film dedusting desulfurization and ammonia escape treatment technique, spray atomization mixing, venturi mixing, high-speed cyclone separation and water film absorption are combined, high salt wastewater comprising calcium ions and magnesium ions is used as a cleaning agent, after treatment with an oxidation sedimentation tank, a desulfurization agent is supplemented, and pH value is adjusted; and the treated coal-fired boiler flue gas is pumped back to a venturi pressure sprayer and a granite water film dust remover to form water film circular treatment; and after the treatment, boiler flue gas particulate matter emissions and sulfur dioxide emissions can be effectively reduced, the amount of used ammonia is reduced, and the liquid to gas ratio of the delivery amount of the cleaning agent can be reduced.
Description
Technical field
The invention belongs to environmental protection technical field, be specifically related to the method for fire coal boiler fume environmental protection deep treatment and the device of fire coal boiler fume environmental protection deep treatment.
Background technology
Fire coal boiler fume environment protection treating is (with NO about flue dust, sulfur dioxide, nitrogen oxide in coal-fired flue-gas
2meter) effective improvement, meet country the highest permission concentration of emission technical management.
The pollutant emission limit that " fossil-fuel power plant atmospheric pollutant emission standard " (GB13223-2011) allows is as follows; Wherein, from 1 day July in 2015, existing thermal power generation boiler and gas turbine group must perform flue dust, sulfur dioxide, the emission limits of nitrogen oxides of new regulation;
The highest permission concentration of emission (unit: mg/m of Pollutant in Coal Burning Boiler thing
3)
Note: be (1) positioned at Guangxi Zhuang Autonomous Region, Chongqing City, Sichuan Province and Guizhou Province thermal power generation boiler perform this limit value.(2) adopt the thermal power generation boiler of W type flame hearth, existing recirculating fluidized bed thermal power generation boiler, and be constructed and put into operation before 31 days December in 2003 or perform this limit value by the thermal power generation boiler that construction project statement of the effect to be occasioned on the environment is examined.(3) Yinchuan Area dust concentration carries mark on this basis further to 20mg/m
3.
1. former boiler smoke flue dust environment protection treating
A, former flue gas smoke and dust treatment technique:
Former CFB boiler dust removal equipment is electric cleaner, electrostatic fabric filter, belongs to the dust collecting process that electrostatic precipitation and dust removal by filtration match.
B, the description of the process of former flue gas smoke and dust treatment:
When boiler combustion ash-laden gas is by high voltage electric field, to collide with interelectrode positive and negative ion and electronics or charged in ion diffuse moves, bring the grit of electronics and ion anisotropy electrode movement be adsorbed on opposite electrode under the effect of electric field force, the dust on electrode is made to fall into cinder catcher by modes such as rappings, each electric field divides into an ash bucket, divide into a Pressure chamber pump at each electric duster ash bucket, utilize compressed air directly by fly ash carry to grey storehouse.
C, former flue gas smoke and dust treatment actual motion are analyzed:
Entrance dust concentration is large, and power plant for self-supply's unit as-fired coal ash content can reach about 39.57%, therefore makes deduster entrance concentration 39.53g/m
3.And be 33.54% according to as-fired coal kind As-received ash content statistical value, this all will cause deduster entrance concentration higher, thus affect the C-V characteristic of electric cleaner, have a negative impact to ESP Efficiency.
Ash component is on the impact of ESP Efficiency.Ash analysis result display Al
2o
3+ SiO
2content is 77.2%>=75%, wherein SiO
2content is more than half, SiO
2and Al
2o
3fusing point is high, poorly conductive, and dust specific resistance is increased, and is unfavorable for electric cleaner Effec-tive Function.
Fine solid particle content is high, Al
2o
3dust is thin and light, ratio resistance is high, and concerning the most difficult collection electric cleaner, removal efficiency is only about 90%, Al in duration of test flying dust
2o
3content 24.37%, makes fine dust content higher, and electric cleaner is difficult to collect, and can increase electric cleaner outlet soot emissions, particularly increase the discharge capacity of fine dust PM2.5;
Na
2o content is low, Na
2when O content is 1.5 ~ 2%, flying dust increases volume conduction, ratio resistance is declined and is conducive to conduction, Na in duration of test flying dust
2o content only has 0.27%, is less than 0.5%, shows that this flying dust belongs in the scope of difficult dedusting.
2. former boiler flue gas sulphur dioxide is administered
A, former SO 2 from fume Processing tecchnics:
Original CFB boiler flue gas desulfurization facility is in-furnace calcium spraying (CaCO
3) dry desulfurization.
B, former SO 2 from fume Processing tecchnics illustrate:
Agstone desulfurizing agent is by limestone powder bin blanking to material feeding jet pump, and by pressure-fired Geldart-D particle to CFB boiler emulsion zone, by lime stone, (main component is CaCO to the heat in burner hearth
3) be sintered into the activated CaO of tool, with the SO in flue gas
2reaction generates calcium sulfate (CaSO
4) and calcium sulfite (CaSO
3), these product together with flying dust catch by cleaner and carry out desulfurization.
3. former boiler smoke nitrogen oxide is (with NO
2meter) administer
A, former flue gas nitrogen oxide are (with NO
2meter) technique:
Original CFB boiler smoke NOx denitrating system adopts SNCR (SNCR method) technique.
B, description of the process:
SNCR (SNCR) is at furnace outlet cyclone inlet place, and flue-gas temperature, under 850-1050 DEG C of operating mode, under oxygen concurrent conditions, directly sprays into denitrfying agent-ammoniacal liquor [NH to this place
3], oxynitrides reduction is become the method for nitrogen and aqueous vapor.Its reaction principle is as follows:
4NH
3+4NO+O
2=4N
2+6H
2O
Also there is following reaction simultaneously:
4NH
3+5O
2=6H
2O+4NO；4NH
3+3O
2=2N
2+6H
2O
In sum, there are the following problems for prior art:
1) existing fire coal boiler fume administers mainstream technology, and dedusting, desulphurization and denitration equipment investment is large, operating cost is high, there is secondary pollution.
2) problem such as aging, leakage of prior art bag-type dust makes to have during exiting flue gas particle to exceed standard, and cannot stablize and reach national limit standard; Meanwhile, cloth bag leak blowing out huge to Influence of production, change cloth bag high cost; In addition, Yinchuan Area dust emission standard 20mg/m3, technical standard improves.Study effective flue gas ash removal advanced treatment technologies imperative.
3) sulfur dioxide (SO2) emissions are up to standard needs burning fat coal and uses a large amount of desulfurizing agents could can meet national environmental standard discharge value to be≤200mg/m3, and fire coal requires high, and the wasting of resources is large, and operating cost is high.The flue gas desulfurization advanced treatment technologies of Low-cost is to very necessary.
4) SNCR technique needs to consume ammoniacal liquor, although the emission request (≤200mg/m3) of existing environmental regulations can be met, but operating cost is relatively high, after the denitration that puts into operation, afterbody low-temperature zone air preheater easily blocks, reason is the ammoniacal liquor reacting rear escape, generate hydrogen sulfate ammonia liquid at back-end surfaces, easily stick to air preheater tube wall, meet dust and generate solids foul blocking tube lane, also corrode steel pipe air preheater, cause air secondary pollution simultaneously; The denitration advanced treatment technologies of research low nitrogen burning is significant.
Summary of the invention
The object of the invention is to overcome the deficiency in existing production technology, the device of a kind of method of fire coal boiler fume environmental protection deep treatment and a kind of fire coal boiler fume environmental protection deep treatment is provided, venturi water film dust-removal and desulfurizing the escaping of ammonia Combined Treatment technology is used to carry out flue gas ash removal, desulfurization, out of stock deep treatment to boiler, jet atomization mixing, venturi mixing, high speed whirlwind separation, moisture film are absorbed and combine, form efficient flue gas improvement new technology up to standard system and device, specifically details are as follows:
The method of fire coal boiler fume environmental protection deep treatment, concrete steps are as follows: 1. the flue gas from coal-burning boiler enters Venturi tube after preliminary treatment, the pressure nozzle of washing agent through described venturi throat front end sprays into described Venturi tube, and described washing agent fully mixes with described first flue gas through described pressure nozzle jet atomization; 2. after described Venturi tube contraction acceleration, enlarging are slowed down, there is speed difference in described flue gas and soot particle, washing agent, carries out the abundant blended absorbent of secondary react through mutual shearing; 3. the flue gas high speed tangent line of discharging from described Venturi tube rotates into gallet water curtain dust collector king-tower and carries out whirlwind first separation, ash, aqueous phase and impurity along wall by moisture film double absorption; 4. the flue gas be separated enters gallet water curtain dust collector secondary tower pipe from described gallet water curtain dust collector king-tower top, after described gallet water curtain dust collector secondary tower pipe shrinks and accelerates, from gallet water curtain dust collector secondary tower top, tangentially whirlwind enters described gallet water curtain dust collector secondary tower and carries out three times and be separated; 5. the flue gas in gallet water curtain dust collector secondary tower described in, along flowing into air-introduced machine with the vertically disposed smoke exhaust pipe of described gallet water curtain dust collector secondary tower tower body, realizes inertia and is separated for four times; 6. the described flue gas of discharging from described gallet water curtain dust collector secondary tower enters chimney and detects qualified discharge after described air-introduced machine; It is characterized in that, bottom described gallet water curtain dust collector king-tower, the oxidization and sedimentation basin gallet water curtain dust collector is entered by ash, aqueous phase and impurity that moisture film absorbs, in described oxidization and sedimentation basin, adopt floating type aeration to become to be easy to the calcium sulfate precipitation precipitated by the calcium sulfite oxidation not easily precipitated, through natural separation clarification, add desulfurizing agent, adjust ph, the liquid obtained forms moisture film as the described pressure nozzle of Venturi tube described in washing agent blowback and described gallet water curtain dust collector king-tower.
Preferably, described washing agent is high-salt wastewater, containing calcium ion and magnesium ion.
The device of fire coal boiler fume environmental protection deep treatment, comprise chimney, air-introduced machine, gallet water curtain dust collector, Venturi tube, Pulp pump, desulfurizing agent loading system, oxidization and sedimentation basin, gallet water curtain dust collector comprises gallet water curtain dust collector king-tower, gallet water curtain dust collector secondary tower pipe, gallet water curtain dust collector secondary tower, and the flue gas of coal-burning boiler enters from the gas approach of described Venturi tube; The throat front end of described Venturi tube is provided with pressure nozzle, sprays into described Venturi tube for making washing agent; The exhanst gas outlet of described Venturi tube is communicated with gallet water curtain dust collector king-tower, rotates into described gallet water curtain dust collector king-tower for making flue gas high speed tangent line; Described gallet water curtain dust collector king-tower is communicated with gallet water curtain dust collector secondary tower by gallet water curtain dust collector secondary tower pipe, described gallet water curtain dust collector secondary tower is communicated with chimney by smoke exhaust pipe with air-introduced machine, and described smoke exhaust pipe is vertical with gallet water curtain dust collector secondary tower tower body to be arranged; It is characterized in that, be connected with oxidization and sedimentation basin bottom described gallet water curtain dust collector king-tower, the pipeline that described oxidization and sedimentation basin is communicated with described gallet water curtain dust collector king-tower is provided with desulfurizing agent loading system, Pulp pump.
Preferably, be provided with multiple every road in oxidization and sedimentation basin, describedly every road, oxidization and sedimentation basin be divided into 8 grades of processing regions, carry out aerating oxidation at 1 ~ 2 grade, multistage natural separation clarification is carried out in other regions.
Jet atomization mixing, venturi mixing, high speed whirlwind separation, moisture film are absorbed four general principles and integrate by the present invention, form efficient flue gas improvement new technology up to standard.
Application venturi dust removal with desulfurization by water film the escaping of ammonia Combined Treatment technology, effectively can improve regulation effect and the disposal ability of boiler smoke, can continuous and steady operation, fullying meet current national highest standard, is the low cost measure of boiler smoke dedusting, desulphurization and denitration integration deep treatment.Concrete effect is as follows:
1) the granular material discharged value of boiler smoke is down to below 20mg/m3 steady operational status by 30mg/m3 non-steady state;
2) sulfur dioxide (SO2) emissions value stabilization is at below 200mg/m3, and the calcium sulfur ratio of in-furnace calcium spraying is down to 1.5mol:1mol by 4.0mol:1mol, CaCO
3use amount reduces 62.5%;
3) NO
xconcentration stabilize at 200mg/Nm
3within, the air supply duct local flow improvement of cooperation, do not need in stove to spray ammoniacal liquor, year reduces ammoniacal liquor about 10,000 tons (ammoniacal liquor of 14%), and economic benefit is clearly;
4), there is not wasting phenomenon in the residual ammonia of denitration, the residual calcium carbonate of desulfurization, the residual ash of electric precipitation, haline water associated treatment;
5) compared with current most advanced washing process, the liquid-gas ratio of washing agent conveying capacity is 2, and this technique realizes liquid-gas ratio 0.56, and operating cost reduces by 72%;
6) low-quality fire coal can be received, significantly reduce coal-fired cost;
7) CaSO
4less Deng accessory substance, secondary pollution can not be produced to environment, economical operation safety and stability.
8) discharge rate of denitration 14% ammoniacal liquor can be made to be reduced to 0, NO by 500L/h/ platform
xbe stabilized in below 200mg/m3, when index improves again, only need start spray ammonia, not need further conversion; Desulfurized limestone discharge rate is reduced to 0.9t/h/ platform by 2.5t/h/ platform.
Accompanying drawing explanation
Fig. 1 is the flow chart of the method for fire coal boiler fume environmental protection deep treatment.
1. chimney; 2. air-introduced machine; 3. gallet water curtain dust collector secondary tower; 4. gallet water curtain dust collector secondary tower pipe; 5. gallet water curtain dust collector king-tower; 6. pressure nozzle; 7. Venturi tube; 8. Pulp pump; 9. desulfurizing agent loading system; 10. oxidization and sedimentation basin
Detailed description of the invention
The method of fire coal boiler fume environmental protection deep treatment, concrete steps are as follows: 1. the flue gas from coal-burning boiler enters Venturi tube after preliminary treatment, the pressure nozzle (6) of washing agent through described venturi throat front end sprays into described Venturi tube (7), and described washing agent fully mixes with described first flue gas through described pressure nozzle jet atomization; 2. after described Venturi tube contraction acceleration, enlarging are slowed down, there is speed difference in described flue gas and soot particle, washing agent, carries out the abundant blended absorbent of secondary react through mutual shearing; 3. the flue gas high speed tangent line of discharging from described Venturi tube rotates into gallet water curtain dust collector king-tower (5) and carries out whirlwind first separation, ash, aqueous phase and impurity along wall by moisture film double absorption; 4. the flue gas be separated enters gallet water curtain dust collector secondary tower pipe (4) from described gallet water curtain dust collector king-tower top, after described gallet water curtain dust collector secondary tower pipe shrinks and accelerates, from gallet water curtain dust collector secondary tower (3) top, tangentially whirlwind enters described gallet water curtain dust collector secondary tower and carries out three times and be separated; 5. the flue gas in gallet water curtain dust collector secondary tower described in, along flowing into air-introduced machine (2) with the vertically disposed smoke exhaust pipe of described gallet water curtain dust collector secondary tower tower body, realizes inertia and is separated for four times; 6. the described flue gas of discharging from described gallet water curtain dust collector secondary tower enters chimney (1) and detects qualified discharge after described air-introduced machine; Bottom described gallet water curtain dust collector king-tower, the oxidization and sedimentation basin (10) gallet water curtain dust collector is entered by ash, aqueous phase and impurity that moisture film absorbs, inject 0.2MPa air from source of the gas and inject reaction zone by oxidation and aeration region, in described oxidization and sedimentation basin, adopt floating type aeration to become to be easy to the calcium sulfate precipitation precipitated by the calcium sulfite oxidation not easily precipitated, through natural separation clarification, add desulfurizing agent, adjust ph, the liquid obtained forms moisture film as the described pressure nozzle of Venturi tube described in washing agent blowback and described gallet water curtain dust collector king-tower.
The washing agent used is high-salt wastewater, containing calcium ion and magnesium ion.Washing agent technique adopts unsaturated washing, and saturated precipitation oxidation is separated, and the washing agent pH value after processing 8 grades of process can be 5.8 ~ 6.0; Turbidity can be 10 ~ 30.Owing to using slurry wash in existing dust-removal and desulfurizing method of denitration, the turbidity of slurries is large, and the effect of washing is bad, thus makes now methodical liquid-gas ratio be 2, and dust-removal and desulfurizing denitration effect is limited.Use in the method for fire coal boiler fume environmental protection deep treatment, the washing agent pH value after process controls 5.8 ~ 6.0; Turbidity controls 10 ~ 30, through solubilize process, after filling desulfurizing agent, effectively can reduce liquid-gas ratio, realize liquid-gas ratio 0.56.
The device of fire coal boiler fume environmental protection deep treatment, comprise chimney (1), air-introduced machine (2), gallet water curtain dust collector, Venturi tube (7), Pulp pump (8), desulfurizing agent loading system (9), oxidization and sedimentation basin (10), gallet water curtain dust collector comprises gallet water curtain dust collector secondary tower (3), gallet water curtain dust collector secondary tower pipe (4), gallet water curtain dust collector king-tower (5), and the flue gas of coal-burning boiler enters from the gas approach of described Venturi tube; The throat front end of described Venturi tube is provided with pressure nozzle (6), sprays into described Venturi tube for making washing agent; The exhanst gas outlet of described Venturi tube is communicated with gallet water curtain dust collector king-tower, rotates into described gallet water curtain dust collector king-tower for making flue gas high speed tangent line; Described gallet water curtain dust collector king-tower is communicated with gallet water curtain dust collector secondary tower by gallet water curtain dust collector secondary tower pipe, described gallet water curtain dust collector secondary tower is communicated with chimney by smoke exhaust pipe with air-introduced machine, and described smoke exhaust pipe is vertical with gallet water curtain dust collector secondary tower tower body to be arranged; Be connected with oxidization and sedimentation basin bottom described gallet water curtain dust collector king-tower, the pipeline that described oxidization and sedimentation basin is communicated with described gallet water curtain dust collector king-tower is provided with desulfurizing agent loading system, Pulp pump; Be provided with multiple every road in described oxidization and sedimentation basin, describedly every road, oxidization and sedimentation basin be divided into 8 grades of processing regions, carry out aerating oxidation at 1 ~ 2 grade, multistage natural separation clarification is carried out in other regions.
Claims (4)
1. the method for a fire coal boiler fume environmental protection deep treatment, concrete steps are as follows: 1. the flue gas from coal-burning boiler enters Venturi tube after preliminary treatment, the pressure nozzle of washing agent through described venturi throat front end sprays into described Venturi tube, and described washing agent fully mixes with described first flue gas through described pressure nozzle jet atomization; 2. after described Venturi tube contraction acceleration, enlarging are slowed down, there is speed difference in described flue gas and soot particle, washing agent, carries out the abundant blended absorbent of secondary react through mutual shearing; 3. the flue gas high speed tangent line of discharging from described Venturi tube rotates into gallet water curtain dust collector king-tower and carries out whirlwind first separation, ash, aqueous phase and impurity along wall by moisture film double absorption; 4. the flue gas be separated enters gallet water curtain dust collector secondary tower pipe from described gallet water curtain dust collector king-tower top, after described gallet water curtain dust collector secondary tower pipe shrinks and accelerates, from gallet water curtain dust collector secondary tower top, tangentially whirlwind enters described gallet water curtain dust collector secondary tower and carries out three times and be separated; 5. the flue gas in gallet water curtain dust collector secondary tower described in, along flowing into air-introduced machine with the vertically disposed smoke exhaust pipe of described gallet water curtain dust collector secondary tower tower body, realizes inertia and is separated for four times; 6. the described flue gas of discharging from described gallet water curtain dust collector secondary tower enters chimney and detects qualified discharge after described air-introduced machine; It is characterized in that, bottom described gallet water curtain dust collector king-tower, the oxidization and sedimentation basin gallet water curtain dust collector is entered by ash, aqueous phase and impurity that moisture film absorbs, in described oxidization and sedimentation basin, adopt floating type aeration to become to be easy to the calcium sulfate precipitation precipitated by the calcium sulfite oxidation not easily precipitated, through natural separation clarification, add desulfurizing agent, adjust ph, the liquid obtained forms moisture film as the described pressure nozzle of Venturi tube described in washing agent blowback and described gallet water curtain dust collector king-tower.
2. method according to claim 1, is characterized in that, described washing agent is high-salt wastewater, containing calcium ion and magnesium ion.
3. the device of a fire coal boiler fume environmental protection deep treatment, comprise chimney, air-introduced machine, gallet water curtain dust collector, Venturi tube, Pulp pump, desulfurizing agent loading system, oxidization and sedimentation basin, gallet water curtain dust collector comprises gallet water curtain dust collector king-tower, gallet water curtain dust collector secondary tower pipe, gallet water curtain dust collector secondary tower, and the flue gas of coal-burning boiler enters from the gas approach of described Venturi tube; The throat front end of described Venturi tube is provided with pressure nozzle, sprays into described Venturi tube for making washing agent; The exhanst gas outlet of described Venturi tube is communicated with gallet water curtain dust collector king-tower, rotates into described gallet water curtain dust collector king-tower for making flue gas high speed tangent line; Described gallet water curtain dust collector king-tower is communicated with gallet water curtain dust collector secondary tower by gallet water curtain dust collector secondary tower pipe, described gallet water curtain dust collector secondary tower is communicated with chimney by smoke exhaust pipe with air-introduced machine, and described smoke exhaust pipe is vertical with gallet water curtain dust collector secondary tower tower body to be arranged; It is characterized in that, be connected with oxidization and sedimentation basin bottom described gallet water curtain dust collector king-tower, the pipeline that described oxidization and sedimentation basin is communicated with described gallet water curtain dust collector king-tower is provided with desulfurizing agent loading system, Pulp pump.
4. device according to claim 3, is characterized in that, is provided with multiple every road in described oxidization and sedimentation basin, describedly every road, oxidization and sedimentation basin is divided into 8 grades of processing regions, and carry out aerating oxidation at 1 ~ 2 grade, multistage natural separation clarification is carried out in other regions.
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| CN106422730A (en) * | 2016-08-31 | 2017-02-22 | 张明鑫 | Double wet method flue gas desulphurization and dust removal treatment process |
| CN108479332A (en) * | 2018-04-16 | 2018-09-04 | 天津华赛尔传热设备有限公司 | A kind of low-temperature flue gas desulphurization denitration disappears white system |
| CN108744925A (en) * | 2018-05-22 | 2018-11-06 | 肇庆中能创智信息科技有限公司 | A kind of energy saving and environment friendly industrial waste-gas purifier |
| CN110479057A (en) * | 2019-07-30 | 2019-11-22 | 江苏联慧资源环境科技有限公司 | A kind of method of chemical oxidation absorbing treating smoke pollutant |
| CN111271719A (en) * | 2020-03-02 | 2020-06-12 | 天津辰创环境工程科技有限责任公司 | A secondary combustion chamber emergency discharge chimney tail gas purification system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106422730A (en) * | 2016-08-31 | 2017-02-22 | 张明鑫 | Double wet method flue gas desulphurization and dust removal treatment process |
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| CN108479332A (en) * | 2018-04-16 | 2018-09-04 | 天津华赛尔传热设备有限公司 | A kind of low-temperature flue gas desulphurization denitration disappears white system |
| CN108744925A (en) * | 2018-05-22 | 2018-11-06 | 肇庆中能创智信息科技有限公司 | A kind of energy saving and environment friendly industrial waste-gas purifier |
| CN110479057A (en) * | 2019-07-30 | 2019-11-22 | 江苏联慧资源环境科技有限公司 | A kind of method of chemical oxidation absorbing treating smoke pollutant |
| CN111271719A (en) * | 2020-03-02 | 2020-06-12 | 天津辰创环境工程科技有限责任公司 | A secondary combustion chamber emergency discharge chimney tail gas purification system |
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