CN110193282A - A kind of waste flue gas of boilers processing system and method - Google Patents
A kind of waste flue gas of boilers processing system and method Download PDFInfo
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- CN110193282A CN110193282A CN201910525356.XA CN201910525356A CN110193282A CN 110193282 A CN110193282 A CN 110193282A CN 201910525356 A CN201910525356 A CN 201910525356A CN 110193282 A CN110193282 A CN 110193282A
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- flue gas
- gas
- boiler
- boilers
- processing system
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- 239000003546 flue gas Substances 0.000 title claims abstract description 85
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 80
- 238000012545 processing Methods 0.000 title claims abstract description 25
- 239000002699 waste material Substances 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title abstract description 9
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 61
- 239000007789 gas Substances 0.000 claims abstract description 42
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 31
- 230000003009 desulfurizing effect Effects 0.000 claims abstract description 28
- 239000000779 smoke Substances 0.000 claims abstract description 27
- 230000023556 desulfurization Effects 0.000 claims abstract description 25
- 239000000428 dust Substances 0.000 claims abstract description 25
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000012717 electrostatic precipitator Substances 0.000 claims abstract description 17
- 230000002776 aggregation Effects 0.000 claims abstract description 16
- 238000004220 aggregation Methods 0.000 claims abstract description 16
- 239000011593 sulfur Substances 0.000 claims abstract description 12
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 12
- 230000005684 electric field Effects 0.000 claims abstract description 11
- 239000012528 membrane Substances 0.000 claims description 19
- 239000010410 layer Substances 0.000 claims description 17
- 238000001914 filtration Methods 0.000 claims description 14
- 239000011229 interlayer Substances 0.000 claims description 12
- 239000007921 spray Substances 0.000 claims description 11
- 239000002245 particle Substances 0.000 claims description 8
- 239000003638 chemical reducing agent Substances 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 6
- 239000000443 aerosol Substances 0.000 claims description 5
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 4
- 239000011575 calcium Substances 0.000 claims description 4
- 229910052791 calcium Inorganic materials 0.000 claims description 4
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 claims description 4
- 238000003672 processing method Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 230000008676 import Effects 0.000 claims description 3
- 210000000038 chest Anatomy 0.000 claims 1
- 238000000926 separation method Methods 0.000 claims 1
- 239000002912 waste gas Substances 0.000 abstract description 7
- 239000007787 solid Substances 0.000 abstract description 5
- 238000002485 combustion reaction Methods 0.000 abstract description 4
- 238000000746 purification Methods 0.000 abstract description 4
- 239000002594 sorbent Substances 0.000 abstract description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 10
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 8
- 239000005864 Sulphur Substances 0.000 description 6
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical group [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 5
- 229910021529 ammonia Inorganic materials 0.000 description 5
- 235000011114 ammonium hydroxide Nutrition 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 4
- 235000019504 cigarettes Nutrition 0.000 description 4
- 235000019738 Limestone Nutrition 0.000 description 3
- 239000000908 ammonium hydroxide Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000006028 limestone Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 239000003500 flue dust Substances 0.000 description 2
- 229910052602 gypsum Inorganic materials 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000013517 stratification Methods 0.000 description 2
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000010494 dissociation reaction Methods 0.000 description 1
- 230000005593 dissociations Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000008234 soft water Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001052 transient effect Effects 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
-
- 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
- B01D53/508—Sulfur oxides by treating the gases with solids
-
- 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
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/40—Alkaline earth metal or magnesium compounds
- B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/602—Oxides
-
- 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 kind of waste flue gas of boilers processing system and method, the cyclone separator being connect including the outlet flue with boiler, the bag filter being connected with the cyclone separator, the desulfuration absorbing tower being connected with the bag filter, the electrostatic precipitator being connected with the desulfuration absorbing tower.The present invention carries out desulfurization and denitration in the boiler combustion stage first, pass through the cyclone dust removal of front end boiler section and the outer bag-type dust of rear end boiler again, it improves gas-solid disngaging efficiency and removes fine grit, it reduces boiler and goes out smoke content in kiln gas, the haptoreaction time of sulfur-containing smoke gas and desulfurizing agent is increased by desulfuration absorbing tower, the utilization rate of desulfurizing agent can be greatly improved, reduce sorbent consumption, desulfuration efficiency is high, pass through electrostatic precipitator, it is captured after drop is charged in electric field to aggregation plate, demisting processing is carried out to the flue gas of discharge, reach minimum discharge requirement, waste flue gas of boilers processing system through the invention, flue gas good purification, meet the requirement of waste gas pollution control and treatment.
Description
Technical field
The present invention relates to a kind of boiler exhaust gas processing technical field more particularly to a kind of waste flue gas of boilers processing system and
Method.
Background technique
Currently, various boilers are not only widely used in the industry, in people's daily life also more and more widely
It is used, according to coal-fired coal quality and the process characteristic of coal-burning power plant, institute's pollution discharging object is mainly SO in boiler smoke2, NOx and cigarette
Dirt, wherein sulfur dioxide is to cause one of major pollutants of acid rain.Therefore, the discharge of boiler exhaust gas is that people pay close attention to always
Problem, exhaust filtering is not clean, necessarily causes the destruction to the Nature, other harmful substance exhaust filterings are not clean, also can be right
The Nature damages.Occur largely being directed to the device of boiler exhaust gas purified treatment at present, although can play certain net
Change effect, manufacturing cost is high, flue gas clean-up effect is bad, is unsatisfactory for the requirement of waste gas pollution control and treatment.
Summary of the invention
In view of this, the main purpose of the present invention is to provide a kind of waste flue gas of boilers processing system and method, flue gas
Good purification meets the requirement of waste gas pollution control and treatment.
In order to achieve the above objectives, the present invention provides a kind of waste flue gas of boilers processing systems, including the outlet flue with boiler
The cyclone separator of connection, the bag filter being connected with the cyclone separator, the desulfurization being connected with the bag filter
Absorption tower, the electrostatic precipitator being connected with the desulfuration absorbing tower；
The cyclone separator include Membrane Separator Cylinder for CFB Boiler, positioned at the Membrane Separator Cylinder for CFB Boiler bottom conically shaped, be located at it is described
Central tube at the top of Membrane Separator Cylinder for CFB Boiler, the Membrane Separator Cylinder for CFB Boiler is interior to be equipped with the spiral feeder pipe connecting with the burner hearth of the boiler；
The bag filter includes body of deduster, and the upper inside of the body of deduster is provided at least two and removes
Dirt cloth bag, the lower part of the body of deduster are connected with the central tube, and the lower part of body of deduster is provided with multistorey strainer mesh,
Multistorey strainer mesh is arranged with the back taper ash bucket being connected with body of deduster lower part, is additionally provided with support tube in body of deduster,
Telescopic pipe is equipped on support tube；
The jet pipe for spraying desulfurizing agent, the smoke inlet of the desulfuration absorbing tower lower end are equipped with inside the desulfuration absorbing tower
Be connected with the top of the body of deduster, be equipped between the smoke inlet and jet pipe in the desulfuration absorbing tower desulfurization every
Layer；
The electrostatic precipitator includes high voltage electric field and at least two horizontally disposed, parallel with flow of flue gas direction aggregations
Plate；The exhaust gases passes for flow of flue gas are collectively formed in the adjacent aggregation plate.
Further, cleaner head is provided at the top of the telescopic pipe；
The support tube is circumscribed with dust exhaust apparatus by pipeline.
Further, blower device is provided with right above the multiple filtration net；
The mesh aperture of the multiple filtration net is 0.8~1.5 μm.
Further, the desulfurization interlayer includes air-permeable layer and filter layer, and the filter layer is equipped with filter opening；
The air-permeable layer is made of several warps being interweaved and weft, adjacent two warps and adjacent two wefts it
Between constitute have air hole.
Further, uniform intervals are equipped with nozzle on the jet pipe.
Further, the high voltage electric field includes that anode tube row arranges with cathode tube, along the flow direction of flue gas, the anode
Pipe row is obliquely installed with cathode tube row, and anode tube row is connected with high voltage power supply, and the high voltage power supply is used for described
Anode tube row's power supply.
The present invention also provides a kind of waste flue gas of boilers processing methods, comprising the following steps:
S1, spray calcium is carried out to boiler furnace, reduce SO in flue gas2Concentration；
S2, amino-containing reducing agent is sprayed into furnace, the NOx in flue gas is restored into removing；
S3, the ash-laden gas come out from the outlet flue of boiler are tangentially square by the side of the Membrane Separator Cylinder for CFB Boiler of cyclone separator
To importing, flue gas flow rate increases, and air-flow imports at the top of Membrane Separator Cylinder for CFB Boiler along centerline direction, and flue gas flow rate increases, and air-flow exists
Cylinder top downwards, reaches before the endpoint of the conically shaped of cyclone separator on counter steer, flue gas is by revolving after dedusting along central tube rotation
Cyclone separator is discharged in the central tube of wind separator；Big particle is separated through the spiral feeder pipe of cyclone separator in flue gas
To return to burner hearth；
S4, the flue gas after cyclone separator separates enter bag filter, pass through multiple filtration net and dust-removal cloth-bag pair
Flue gas gathers dust；
S5, after bag filter gathers dust, by air-introduced machine pressurize be sent into desulfuration absorbing tower, by jet pipe downwards spray take off
Sulphur agent, the sulfur-containing smoke gas moved upwards pass through desulfurization interlayer, and desulfurizing agent forms desulfurizing agent water curtain in desulfurization interlayer, increase desulfurizing agent
Residence time in desulfuration absorbing tower increases the haptoreaction time of sulfur-containing smoke gas and desulfurizing agent；
S6, the flue gas after desulfuration absorbing tower desulfurization enter electrostatic precipitator, and under high-pressure electrostatic, gas ionization simultaneously makes wherein
Droplet and charging aerosol particles are moved to the plate face of aggregation plate, and are trapped on aggregation plate, and the cigarette after simultaneously demisting is purified
Gas leads to 100m high chimney emission by flue.
Compared with prior art, the invention has the following beneficial effects: the present invention to be taken off first in the boiler combustion stage
Sulphur and denitration reduce SO in flue gas2And NOx concentration, then pass through the cyclone dust removal of front end boiler section and the outer bag-type dust of rear end boiler,
It improves gas-solid disngaging efficiency and removes fine grit, reduce boiler and go out smoke content in kiln gas, it is dense that boiler waste gas exports flue dust
It spends up to 10mg/m3Below.It the haptoreaction time that sulfur-containing smoke gas and desulfurizing agent are increased by desulfuration absorbing tower, can mention significantly
The utilization rate of high desulfurizer reduces sorbent consumption, and desulfuration efficiency is high, further decreases the sulfur dioxide concentration of boiler smoke,
It is reduced to 35mg/m3Below；By electrostatic precipitator, it is captured after drop is charged in electric field to aggregation plate 41, to the cigarette of discharge
Gas carries out demisting processing, reaches minimum discharge requirement, waste flue gas of boilers processing system through the invention, flue gas clean-up effect
It is good, meet the requirement of waste gas pollution control and treatment.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of waste flue gas of boilers processing system of the invention；
Fig. 2 is the flow diagram of waste flue gas of boilers processing method of the invention.
Specific embodiment
The specific embodiment of 1 pair of waste flue gas of boilers processing system of the present invention carries out detailed with reference to the accompanying drawings
Explanation.
As shown in Figure 1, being the structural schematic diagram of waste flue gas of boilers processing system of the invention, waste flue gas of boilers of the invention
The bag-type dust that processing system includes the cyclone separator 10 connecting with the outlet flue of boiler, is connected with the cyclone separator 10
Device 20, the desulfuration absorbing tower 30 being connected with the bag filter 20, the electrostatic precipitator 40 being connected with the desulfuration absorbing tower 30.
Cyclone separator 10 in the present invention includes Membrane Separator Cylinder for CFB Boiler 11, the conically shaped positioned at the Membrane Separator Cylinder for CFB Boiler bottom
12, the central tube 13 at the top of the Membrane Separator Cylinder for CFB Boiler is equipped in the Membrane Separator Cylinder for CFB Boiler 11 and the burner hearth of the boiler connects
Spiral feeder pipe 14 is connect, the pipeline section area of the spiral feeder pipe 14 gradually becomes smaller from top to bottom.Cyclone separator 10 is
Centrifugal force caused by ash-laden gas using rotation separates particle from air-flow, comes out from the outlet flue of boiler
Ash-laden gas is imported along a tangential direction by the side of Membrane Separator Cylinder for CFB Boiler 11, and flue gas flow rate increases, and air-flow is at the top of Membrane Separator Cylinder for CFB Boiler
It is imported along centerline direction, flue gas flow rate increases, and air-flow is downward along central tube rotation at the top of cylinder, reaches the endpoint of conically shaped 12
On preceding counter steer, cyclone separator is discharged by central tube 13 in flue gas after dedusting, and cyclone separator through the invention can be mentioned effectively
High gas-solid disngaging efficiency avoids the probability that bulky grain is discharged from central tube 13 in flue gas, and purified flue gas is through cyclone separator
Central tube 13 be discharged.
The cyclone separator being connect in the present invention with boiler be mainly will a large amount of solid particles that be carried in flue gas from air-flow
In separate, and burner hearth is returned to by spiral feeder pipe 14, guarantees that fuel and sulphur agent repeatedly recycle, burn and react repeatedly,
Promote full combustion, while reducing the content of bulky grain flue dust in flue gas, the main boiler that reduces goes out smoke content in kiln gas, greatly
The big pressure for reducing the outer flue gas ash removal of rear end furnace.
Bag filter 20 of the invention includes body of deduster 21, and the upper inside of the body of deduster 21 is provided with
At least two dust-removal cloth-bags 22, for PPS+PTEE overlay film, which is able to bear the filter pocket material that dust-removal cloth-bag 22 uses
280 DEG C of TRANSIENT HIGH TEMPERATURE, long-term stable operation temperature is at 150 DEG C or so.Temperature when flue gas enters bag filter 130~
150 DEG C, higher than the close dew temperature of flue gas, the operation of bag filter can be impacted to avoid the vapor in flue gas, really
Protect the operation steady in a long-term of bag filter.The lower part of the body of deduster 21 is connected with the central tube 13, deduster sheet
The lower part of body 21 is provided with multistorey strainer mesh 23, and the mesh aperture of the multiple filtration net 23 is 0.8~1.5 μm.Multiple filtration net
23 surface is provided with blower device, removes the dust stratification on multiple filtration net 23 by blower device air blast.In multistorey strainer mesh
23 are arranged with the back taper ash bucket 24 being connected with 21 lower part of body of deduster, are additionally provided with support tube in body of deduster 21
25, telescopic pipe 26 is equipped on support tube 25.The top of telescopic pipe 26 is provided with cleaner head 27, and described
Support tube 25 is circumscribed with dust exhaust apparatus 28 by pipeline.Cleaner head 27 is directed at 22 inside of dust-removal cloth-bag, opens dust exhaust apparatus 28,
Telescopic pipe 26 on support tube 25 moves up and down while up and down motion with cleaner head 27, by 22 inside of dust-removal cloth-bag
Dust stratification clean out.The dust accumulation on cloth bag can be cleaned out using dust exhaust apparatus 28, maintenance cost is low, using the present invention
Bag filter can remove the fine grit that other dedusters are difficult to remove, have excellent dust collection performance, efficiency of dust collection
It is high.
Be equipped with jet pipe 31 for spraying desulfurizing agent inside desulfuration absorbing tower 30 of the invention, on the jet pipe 31 uniformly between
Every being equipped with nozzle, desulfurizing agent can be sprayed downwards by nozzle.The smoke inlet and the deduster of 30 lower end of desulfuration absorbing tower
The top of ontology 20 is connected, and is equipped with desulfurization interlayer, the desulfurization in the desulfuration absorbing tower between the smoke inlet and jet pipe 31
Interlayer includes air-permeable layer 32 and filter layer 33, and the filter layer 33 is equipped with filter opening, and the air-permeable layer 31 is interweaved by several
Warp and weft constitute, between adjacent two warps and adjacent two wefts constitute have air hole.Enter in sulfur-containing smoke gas de-
Behind sulphur absorption tower 30, jet pipe 31 in desulfuration absorbing tower 30 spray desulfurizing agent downwards, during filter smoke, smog is from mistake
Filter hole on filtering layer 33 enters to air-permeable layer 32, and desulfurization interlayer is just passed through through air hole, and desulfurizing agent can be in air-permeable layer 32 and mistake
Desulfurizing agent water curtain is formed between filtering layer 33, residence time of the desulfurizing agent in desulfuration absorbing tower is increased in this way, to increase
The haptoreaction time of sulfur-containing smoke gas and desulfurizing agent, desulfuration efficiency are high.Flue gas after desulfurizing tower desulfurization can be from top to down
It is passed through in electrostatic precipitator progress demisting processing, it is anti-that the sulfur-containing smoke gas moved upwards with the desulfurizing agent to whereabouts can contact progress desulfurization
The outlet flue of Ying Houcong desulfuration absorbing tower is discharged, and desulfuration efficiency can reach 87.5% or more, can significantly reduce sulphur in boiler smoke
Compound exit concentration.
Electrostatic precipitator 40 of the invention includes that high voltage electric field and at least two are horizontally disposed, parallel with flow of flue gas direction
Assemble plate 41, the exhaust gases passes for flow of flue gas are collectively formed in the adjacent aggregation plate 41, and the high voltage electric field is in the flue gas
Electric field is formed in channel, the high voltage electric field includes anode tube row 42 and cathode tube row 43, along the flow direction of flue gas, the sun
Pole pipe row 42 is obliquely installed with cathode tube row 43, and anode tube row 42 is connected with high voltage power supply, and the high voltage power supply is used
It powers in anode tube row 42.Contain largely from the flue gas of the desulfurization fume of desulfuration absorbing tower 30 outlet discharge without removing
Droplet and aerosol cloud, connected from electrostatic precipitator gas inlet and enter electrostatic precipitator 40, then pass through exhaust gases passes.Sun
Pole pipe row 42 generates high voltage electric field with cathode tube row 43, and under high-pressure electrostatic, gas ionization simultaneously makes wherein droplet and aerosol
Grain is charged, moves to the plate face of aggregation plate 41, and is trapped on aggregation plate 41, and tail gas is arranged through demisting exhanst gas outlet after purification
It puts, electrostatic precipitator of the invention has preferable defogging effect.
As shown in Fig. 2, the present invention also provides a kind of waste flue gas of boilers processing methods, comprising the following steps:
S1, spray calcium is carried out to boiler furnace, reduce SO in flue gas2Concentration, the present invention are calcined in furnace using agstone
It decomposes, utilizes the SO in the CaO and inner flue gas of the stove of generation2It carries out reaction and realizes desulfuration in furnace.The position of in-furnace calcium spraying is returning charge
Device feedback outlet, returning charge ash can play the role of preheating and lime stone promoted to spread in furnace, can greatly improve the utilization of lime stone
Rate reduces consumption of limestone.It chemically reacts as follows:
1) gas is from gas phase main body to the diffusion of liquid surface air film
(XYm represents SO to XYm (gas phase main body) → XYm (air film)2、SO3Deng)
2) XYm passes through the diffusion and dissolution of gas-liquid interface from air film
XYm(g)→XYm(aq)
3) hydro-combination process of dissolved gas
SO2(aq)+H2O→H2SO3
SO3(aq)+H2O→H2SO4
4) dissociation in solution, oxidation
H2SO3→H++HSO3 -
H2SO3 -→H++SO3 2-
H2SO3 -+1/2O2→HSO4 -
SO3 2-+1/2O2→SO4 2-(part)
5) in the liquid phase, CaCO3Dissolution and ionization
CaCO3→Ca2++CO3 2-
CO3 2-+H2O→HCO3 -+OH-
HCO3 -+H2O→H2CO3+OH-
6) OH generated-Neutralization reaction occurs
H++OH-→H2O
7) formation of salt
2H2O+SO4 2-+Ca2+→CaSO4·2H2O(s)
1/2H2O+SO3 2-+Ca2+→CaSO3·1/2H2O(s)
CaSO3·1/2H2O+1/2O2+3/2H2O→CaSO4·2H2O(s)
S2, amino-containing reducing agent is sprayed into furnace, the NOx in flue gas is restored into removing, amino-containing reducing agent is ammonia
Water, ammonia spirit etc., the present invention use 20% low concentration ammonium hydroxide for reducing agent, and denitration process includes ammonia spirit storage system
System, ammonia spirit dilution, ammonia spirit conveying, ammonia spirit metering and solution spraying system composition.Ammonium hydroxide (20%) elder generation quilt
It is stored in ammonium hydroxide holding vessel, is then transported to weak aqua ammonia storage tank again, while soft water being added to be diluted to the storage of 4% concentration.System opens
It is sent according to NOx emission concentration quantitative to stokehold distributor when dynamic by jet pump.Before spraying into burner hearth, using distributor point
It is assigned to each spray gun, then sprays into burner hearth through spray gun, sprays into the pipeline that point design is connect in boiler furnace with cyclone separator
Section carries out NOx reduction reaction.Within the scope of 850~1100 DEG C, NH3Restore the key reaction of NOx are as follows:
NH3For reducing agent: 4NH3+4NO+O2→4N2+6H2O
S3, the ash-laden gas come out from the outlet flue of boiler are tangentially square by the side of the Membrane Separator Cylinder for CFB Boiler of cyclone separator
To importing, flue gas flow rate increases, and air-flow imports at the top of Membrane Separator Cylinder for CFB Boiler along centerline direction, and flue gas flow rate increases, and air-flow exists
Cylinder top downwards, reaches before the endpoint of the conically shaped of cyclone separator on counter steer, flue gas is by revolving after dedusting along central tube rotation
Cyclone separator is discharged in the central tube of wind separator；Big particle is separated through the spiral feeder pipe of cyclone separator in flue gas
To return to burner hearth；
S4, the flue gas after cyclone separator separates enter bag filter, pass through multiple filtration net and dust-removal cloth-bag pair
Flue gas gathers dust；
S5, after bag filter gathers dust, by air-introduced machine pressurize be sent into desulfuration absorbing tower, by jet pipe downwards spray take off
Sulphur agent, the sulfur-containing smoke gas moved upwards pass through desulfurization interlayer, and desulfurizing agent forms desulfurizing agent water curtain in desulfurization interlayer, increase desulfurizing agent
Residence time in desulfuration absorbing tower increases the haptoreaction time of sulfur-containing smoke gas and desulfurizing agent；
S6, the flue gas after desulfuration absorbing tower desulfurization enter electrostatic precipitator, and under high-pressure electrostatic, gas ionization simultaneously makes wherein
Droplet and charging aerosol particles are moved to the plate face of aggregation plate, and are trapped on aggregation plate, and the cigarette after simultaneously demisting is purified
Gas leads to 100m high chimney emission by flue.
The present invention carries out desulfurization and denitration in the boiler combustion stage first, reduces SO in flue gas2And NOx concentration, then pass through
Front end boiler section cyclone dust removal and the outer bag-type dust of rear end boiler, improve gas-solid disngaging efficiency and remove fine grit, reduce pot
Furnace goes out smoke content in kiln gas, and boiler waste gas exports dust concentration up to 10mg/m3Below.It is increased by desulfuration absorbing tower
The haptoreaction time of sulfur-containing smoke gas and desulfurizing agent can greatly improve the utilization rate of desulfurizing agent, reduce sorbent consumption, desulfurization effect
Rate is high, further decreases the sulfur dioxide concentration of boiler smoke, is reduced to 35mg/m3Below；By electrostatic precipitator, drop is in electricity
In it is charged after be captured to aggregation plate 41, demisting processing is carried out to the flue gas of discharge, reaches minimum discharge requirement, by this hair
Bright waste flue gas of boilers processing system, flue gas good purification meet the requirement of waste gas pollution control and treatment.
The above is a preferred embodiment of the present invention, cannot limit the right model of the present invention with this certainly
It encloses, it is noted that for those skilled in the art, without departing from the principle of the present invention, may be used also
To make several improvement and variation, these, which improve and change, is also considered as protection scope of the present invention.
Claims (8)
1. a kind of waste flue gas of boilers processing system, which is characterized in that the cyclone separator that is connect including the outlet flue with boiler, with
The connected bag filter of the cyclone separator, the desulfuration absorbing tower being connected with the bag filter are inhaled with the desulfurization
Receive the connected electrostatic precipitator of tower；
The cyclone separator include Membrane Separator Cylinder for CFB Boiler, positioned at the Membrane Separator Cylinder for CFB Boiler bottom conically shaped, be located at the separation
Central tube at the top of device cylinder, the Membrane Separator Cylinder for CFB Boiler is interior to be equipped with the spiral feeder pipe connecting with the burner hearth of the boiler；
The bag filter includes body of deduster, and the upper inside of the body of deduster is provided at least two dust removing cloths
Bag, the lower part of the body of deduster are connected with the central tube, and the lower part of body of deduster is provided with multistorey strainer mesh, in multilayer
Strainer is arranged with the back taper ash bucket being connected with body of deduster lower part, is additionally provided with support tube in body of deduster, is propping up
Stay tube is equipped with telescopic pipe；
The jet pipe for spraying desulfurizing agent, the smoke inlet of the desulfuration absorbing tower lower end and institute are equipped with inside the desulfuration absorbing tower
The top for stating body of deduster is connected, and is equipped with desulfurization interlayer in the desulfuration absorbing tower between the smoke inlet and jet pipe；
The electrostatic precipitator includes high voltage electric field and at least two aggregation plates horizontally disposed, parallel with flow of flue gas direction；Phase
The exhaust gases passes for flow of flue gas are collectively formed in the adjacent aggregation plate.
2. waste flue gas of boilers processing system according to claim 1, which is characterized in that the pipeline of the spiral feeder pipe is cut
Face area gradually becomes smaller from top to bottom.
3. waste flue gas of boilers processing system according to claim 1, which is characterized in that the top of the telescopic pipe
It is provided with cleaner head；
The support tube is circumscribed with dust exhaust apparatus by pipeline.
4. waste flue gas of boilers processing system according to claim 1, which is characterized in that the multiple filtration net just on
Side is provided with blower device；
The mesh aperture of the multiple filtration net is 0.8~1.5 μm.
5. waste flue gas of boilers processing system according to claim 1, which is characterized in that the desulfurization interlayer includes air-permeable layer
And filter layer, the filter layer are equipped with filter opening；
The air-permeable layer is made of several warps being interweaved and weft, structure between adjacent two warps and adjacent two wefts
At there is air hole.
6. waste flue gas of boilers processing system according to claim 1, which is characterized in that uniform intervals are equipped on the jet pipe
Nozzle.
7. waste flue gas of boilers processing system according to claim 1, which is characterized in that the high voltage electric field includes anode tube
Row arranges with cathode tube, and along the flow direction of flue gas, the anode tube row and cathode tube row are obliquely installed, and anode tube is arranged
It is connected with high voltage power supply, the high voltage power supply is used to arrange to the anode tube and power.
8. a kind of waste flue gas of boilers processing method, which comprises the following steps:
S1, spray calcium is carried out to boiler furnace, reduce SO in flue gas2Concentration；
S2, amino-containing reducing agent is sprayed into furnace, the NOx in flue gas is restored into removing；
S3, it is led along a tangential direction from the ash-laden gas that the outlet flue of boiler comes out by the side of the Membrane Separator Cylinder for CFB Boiler of cyclone separator
Enter, flue gas flow rate increases, and air-flow imports at the top of Membrane Separator Cylinder for CFB Boiler along centerline direction, and flue gas flow rate increases, and air-flow is on cylinder top
Portion downwards, reaches before the endpoint of the conically shaped of cyclone separator on counter steer, flue gas is by whirlwind point after dedusting along central tube rotation
Cyclone separator is discharged in central tube from device；Big particle is separated through the spiral feeder pipe of cyclone separator and returns in flue gas
Melt down thorax；
S4, the flue gas after cyclone separator separates enter bag filter, by multiple filtration net and dust-removal cloth-bag to flue gas
It gathers dust；
S5, after bag filter gathers dust, by air-introduced machine pressurize be sent into desulfuration absorbing tower, spray desulfurization downwards by jet pipe
Agent, the sulfur-containing smoke gas moved upwards pass through desulfurization interlayer, and desulfurizing agent forms desulfurizing agent water curtain in desulfurization interlayer, increase desulfurizing agent and exist
Residence time in desulfuration absorbing tower increases the haptoreaction time of sulfur-containing smoke gas and desulfurizing agent；
S6, the flue gas after desulfuration absorbing tower desulfurization enter electrostatic precipitator, and under high-pressure electrostatic, gas ionization simultaneously makes wherein droplet
And charging aerosol particles, it is moved to the plate face of aggregation plate, and be trapped on aggregation plate, the flue gas after simultaneously demisting is purified,
100m high chimney emission is led to by flue.
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| CN201910525356.XA CN110193282A (en) | 2019-06-18 | 2019-06-18 | A kind of waste flue gas of boilers processing system and method |
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Cited By (4)
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| CN111569549A (en) * | 2020-06-20 | 2020-08-25 | 宁夏瑞银有色金属科技有限公司 | Waste gas treatment device for regenerated metal smelting furnace |
| CN113797685A (en) * | 2021-09-23 | 2021-12-17 | 李一山 | Cyclone bag-type dust collector |
| CN114432826A (en) * | 2022-01-20 | 2022-05-06 | 抚顺矿业集团有限责任公司页岩炼油胜利实验厂 | Small-particle oil shale dry distillation flue gas treatment method and device adopted by same |
| CN118218130A (en) * | 2024-04-29 | 2024-06-21 | 平利县双泰重晶石粉有限责任公司 | Air circulation purifying system for barite powder production workshop |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111569549A (en) * | 2020-06-20 | 2020-08-25 | 宁夏瑞银有色金属科技有限公司 | Waste gas treatment device for regenerated metal smelting furnace |
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| CN118218130A (en) * | 2024-04-29 | 2024-06-21 | 平利县双泰重晶石粉有限责任公司 | Air circulation purifying system for barite powder production workshop |
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