CN109847937A - A kind of electric precipitation defogging method - Google Patents
A kind of electric precipitation defogging method Download PDFInfo
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- CN109847937A CN109847937A CN201910161959.6A CN201910161959A CN109847937A CN 109847937 A CN109847937 A CN 109847937A CN 201910161959 A CN201910161959 A CN 201910161959A CN 109847937 A CN109847937 A CN 109847937A
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- flue gas
- steam
- hot water
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- electric field
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000001556 precipitation Methods 0.000 title claims abstract description 15
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 120
- 239000003546 flue gas Substances 0.000 claims abstract description 120
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 51
- 238000001179 sorption measurement Methods 0.000 claims abstract description 23
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 claims abstract description 21
- 230000005684 electric field Effects 0.000 claims abstract description 21
- 238000004140 cleaning Methods 0.000 claims abstract description 19
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 14
- 238000002485 combustion reaction Methods 0.000 claims abstract description 13
- 239000003500 flue dust Substances 0.000 claims abstract description 10
- 239000002245 particle Substances 0.000 claims abstract description 6
- 239000002253 acid Substances 0.000 claims abstract description 4
- 241000264877 Hippospongia communis Species 0.000 claims description 11
- 230000004927 fusion Effects 0.000 claims description 9
- 239000008187 granular material Substances 0.000 claims description 8
- 210000000440 neutrophil Anatomy 0.000 claims description 8
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 claims description 7
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 5
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 5
- 230000005611 electricity Effects 0.000 claims description 5
- 239000008213 purified water Substances 0.000 claims description 4
- 239000003610 charcoal Substances 0.000 claims description 3
- -1 sulfate radical Chemical class 0.000 claims description 3
- 150000005837 radical ions Chemical class 0.000 claims 1
- 239000007789 gas Substances 0.000 abstract description 4
- 150000002500 ions Chemical class 0.000 abstract description 3
- 239000003245 coal Substances 0.000 abstract description 2
- 239000000779 smoke Substances 0.000 abstract description 2
- 238000000746 purification Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000003344 environmental pollutant Substances 0.000 description 4
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 229940005654 nitrite ion Drugs 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 235000019504 cigarettes Nutrition 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003517 fume Substances 0.000 description 2
- 239000003595 mist Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 210000001367 artery Anatomy 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 210000003462 vein Anatomy 0.000 description 1
Landscapes
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a kind of electric precipitation defogging methods, with following steps: (1) flue gas that coal-fired boiler combustion generates being passed through in hot water and steam, so that flue dust, fog is generated larger-size grain structure in conjunction with vapor, while removing the sulfur dioxide contained in flue gas；(2) flue gas is passed through in impulse electric field, is absorbed by impulse electric field by the acid ion in flue gas and with electrical particle water structure, removes the grain structure of charging property in flue gas；(3) it is passed through in high-frequency electric field, carries out cleaning removal to the halfway lesser grain structure of carried charge is cleared up；(4) it is passed through the adsorption layer for being attached with active carbon, the flue dust and fog that are carried in flue gas without conductive particles shape are adsorbed, the flue gas after the completion of adsorbing reaches discharge standard and is emitted into external environment.The present invention have the advantages that coal-fired kiln gas high-effective dust-removing, demisting and guarantee it is up to standard to smoke discharge amount, be mainly used for clearing up flue gas in coal furnace.
Description
Technical field
The present invention relates to flue gases purification field, specifically a kind of electric precipitation defogging method.
Background technique
Currently, China is widely used contained in limestone-gypsum wet flue gas desulfurization technology removal coal-fired plant flue gas
SO2Pollutant.The technology is more mature, SO2Removal rate is high, but most desulfurizers do not use flue gas to change in the process of running
Hot device (GGH), exiting flue gas are easy to appear drop entrainment phenomenon, and especially when the flow velocity of flue gas is higher, flue gas carries droplet
Amount will aggravate, and be formed " mist " that partial size is 2~60 μm." mist " not only contain moisture, also dissolved with sulfuric acid, sulfate, SO2And it is other
Subparticle.Existing desulfurization demister system includes tubular demister, board-like demister, ridge type demister etc., for 15 μ of <
The short grained removal of m is limited, is unable to satisfy the dust concentration that country proposes for electricity power enterprise and is less than 5mg/Nm3Ultralow row
Put requirement.
Summary of the invention
Aiming at the defects existing in the prior art, it is an object of the present invention to provide one kind is efficient to coal-fired kiln gas
Dedusting, demisting and guarantee the electric precipitation defogging method up to standard to smoke discharge amount.
Present invention technical solution used for the above purpose is: a kind of electric precipitation defogging method has following step
It is rapid:
Step 1: Steam treatment flue gas:
Cleaning water body is carried out being heated to fluidized state in coal-fired boiler combustion, collects the hot steam of fluidized state, it will
The flue gas that coal-fired boiler combustion generates is passed through in the hot water and steam, is in flue dust, fog and the vapor of fine granularity in flue gas
In conjunction with the larger-size grain structure of generation, while hot water and steam can react with the sulfur dioxide carried in flue gas and generate sulfuric acid
Radical ion or sulfite ion remove the sulfur dioxide contained in flue gas；
Step 2: pulse voltage handles flue gas:
Will by hot steam in step 1, treated that flue gas is passed through in impulse electric field, will be in flue gas by impulse electric field
Acid ion and combined with electrical vapor and generate size larger particles structure and absorb, remove charging property in flue gas
Grain structure；
Step 3: high frequency voltage handles flue gas:
Will by step 2, treated that flue gas is passed through in high-frequency electric field, to clearing up halfway band in the impulse electric field
The lesser grain structure of electricity carries out cleaning removal；
Step 4: active carbon layer handles flue gas:
By by step 3, treated that flue gas is passed through is attached with the adsorption layer of active carbon, to being carried in flue gas without electricity
The granular flue dust of property and fog are adsorbed, and the flue gas after the completion of adsorbing reaches discharge standard and is emitted into external environment.
The direction contrary with flue gas emission to the hot water and steam of cleaning water body heating generation is merged in the step 1,
I.e. flue gas emission direction is opposite with hot steam's pass-out direction, and flue gas is mixed in merging pipeline with hot water and steam, fusion
The caliber of pipeline is set as between 0.5-1.3m, and the length of the fusion pipeline is set as 3-5m.
Hot water and steam is mixed with flue gas in the step 1 generates sulfate ion or sulfite ion, and a part is along cigarette
Gas leads in impulse electric field described in step 3, and another part is net as remaining hot water and steam edge fusion pipeline is discharged into water body
Makeup, which is set, purifies it, and purified water body is heated again through the coal-burning boiler, for using in the step 1.
Oxynitrides can be carried in the flue gas generated in the step 1 by coal-fired boiler combustion, oxynitrides with
Hot water and steam reaction generates nitrate ion or nitrite ion, enter in the step 2 under flue gas drive carry out it is next
Step cleaning.
The discharge inception voltage of impulse electric field is set as 25kV in the step 2, and the waveform valley of pulse voltage is set as
30kV, peak impulse voltage are set as 60kV, and pulse width is set as 200ns, repetition rate 50Hz.
The adsorption layer that active carbon is attached in the step 4 is honey comb structure, and each group hole inside of honeycomb structure is attached
Active charcoal remove and taken in flue gas by step 3 treated flue gas from one end of adsorption layer to other end steady flow
The neutrophil granule of band.
The hole diameter of the honeycomb structure of the adsorption layer is set as 1-5cm, the whole cylindrical knot of the adsorption layer
Structure and its diameter are set as 25-50cm, and the thickness of the adsorption layer is set as 0.5-2.5m.
One end of adsorption layer is communicated with force (forcing) pump in the step 4.
Beneficial effects of the present invention: in use, the flue gas that coal-fired boiler combustion generates is passed through in hot steam, in flue gas
In the flue dust of fine granularity, fog larger-size grain structure is generated in conjunction with vapor, while removing and containing in flue gas
Sulfur dioxide；And fume treatment is handled by high frequency voltage processing flue gas, high frequency voltage, remove the band point carried in flue gas
Grain handles flue gas finally by active carbon layer, removes the neutrophil granule in flue gas, reach high-effective dust-removing demisting and reach and efficiently go
Except the effect of pollutant in flue gas, to guarantee the flue gas of discharge well below discharge standard.
Specific embodiment
Below in conjunction with the embodiment of the present invention, technical scheme in the embodiment of the invention is clearly and completely described,
Obviously, described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based in the present invention
Embodiment, every other embodiment obtained by those of ordinary skill in the art without making creative efforts, all
Belong to the scope of protection of the invention.
Embodiment 1
A kind of electric precipitation defogging method has following steps:
Step 1: Steam treatment flue gas:
Cleaning water body is carried out being heated to fluidized state in coal-fired boiler combustion, collects the hot steam of fluidized state, it will
The flue gas that coal-fired boiler combustion generates is passed through in hot water and steam, in flue gas in the flue dust of fine granularity, fog in conjunction with vapor
Generate larger-size grain structure, at the same hot water and steam can be reacted with the sulfur dioxide carried in flue gas generate sulfate radical from
Son or sulfite ion remove the sulfur dioxide contained in flue gas；
Step 2: pulse voltage handles flue gas:
Will by hot steam in step 1, treated that flue gas is passed through in impulse electric field, will be in flue gas by impulse electric field
Acid ion and combined with electrical vapor and generate size larger particles structure and absorb, remove charging property in flue gas
Grain structure；
Step 3: high frequency voltage handles flue gas:
Will by step 2, treated that flue gas is passed through in high-frequency electric field, to clearing up halfway carried charge in impulse electric field
Lesser grain structure carries out cleaning removal；
Step 4: active carbon layer handles flue gas:
By by step 3, treated that flue gas is passed through is attached with the adsorption layer of active carbon, to being carried in flue gas without electricity
The granular flue dust of property and fog are adsorbed, and the flue gas after the completion of adsorbing reaches discharge standard and is emitted into external environment.
In the present invention, the direction contrary with flue gas emission to the hot water and steam of cleaning water body heating generation in step 1
Fusion, i.e., flue gas emission direction is opposite with hot steam's pass-out direction, and flue gas is mixed in merging pipeline with hot water and steam,
The caliber of fusion pipeline is set as between 0.5-1.3m, and the length for merging pipeline is set as 3-5m, guarantees hot water and steam and fire coal
The flue gas that boiler combustion generates efficiently is mixed, and mixing efficiency is improved, and guarantees the effect of dedusting demisting；
Hot water and steam is mixed with flue gas in step 1 generates sulfate ion or sulfite ion, and a part is logical along flue gas
Into impulse electric field described in step 3, another part is filled as remaining hot water and steam is discharged into water body purification along fusion pipeline
It sets and it is purified, purified water body is heated again through coal-burning boiler, for using in step 1, passes through water body purification
Device pair is cleared up with the mixed cleaning water body of flue gas, guarantees the recycling of cleaning water body；
Oxynitrides, oxynitrides and hot water can be carried in the flue gas generated in step 1 by coal-fired boiler combustion
Steam reaction generates nitrate ion or nitrite ion, and progress next step cleaning in two is entered step under flue gas drive,
To remove the oxynitrides carried in flue gas, guarantee to be in state up to standard when flue gas emission；
The discharge inception voltage of impulse electric field is set as 25kV in step 2, and the waveform valley of pulse voltage is set as 30kV, arteries and veins
It rushes crest voltage and is set as 60kV, pulse width is set as 200ns, repetition rate 50Hz；
The adsorption layer that active carbon is attached in step 4 is honey comb structure, is attached with inside each group hole of honeycomb structure
Active carbon is removed and is carried in flue gas by step 3 treated flue gas from one end of adsorption layer to other end steady flow
Neutrophil granule guarantees that neutrophil granule is fast and efficiently removed；
The hole diameter of the honeycomb structure of adsorption layer is set as 1-5cm, the whole cylindrical structure and it is straight of adsorption layer
Diameter is set as 25-50cm, and the thickness of adsorption layer is set as 0.5-2.5m；
One end of adsorption layer is communicated with force (forcing) pump in step 4, accelerates the scale removal process to flue gas, improves dedusting demisting
Efficiency.
Embodiment 2
The beneficial effects of the present invention are: in use, the flue gas that coal-fired boiler combustion generates is passed through in hot steam, flue gas
In generate larger-size grain structure in conjunction with vapor in flue dust, the fog of fine granularity, while removing in flue gas and containing
Sulfur dioxide；And fume treatment is handled by high frequency voltage processing flue gas, high frequency voltage, remove the band point carried in flue gas
Grain handles flue gas finally by active carbon layer, removes the neutrophil granule in flue gas, reach high-effective dust-removing demisting and reach and efficiently go
Except the effect of pollutant in flue gas, to guarantee the flue gas of discharge well below discharge standard.
Embodiment 3
The direction contrary with flue gas emission to the hot water and steam of cleaning water body heating generation is merged in step 1, i.e. cigarette
Gas emission direction is opposite with hot steam's pass-out direction, and flue gas is mixed in merging pipeline with hot water and steam, ensure that heat
Water vapour is efficiently mixed with the flue gas that coal-fired boiler combustion generates, and improves mixing efficiency, guarantees the effect of dedusting demisting, together
When flue gas in oxynitrides reacted with hot water and steam and generate nitrate ion or nitrite ion, enter under flue gas drive
Next step cleaning is carried out in step 2, to remove the oxynitrides carried in flue gas, guarantee in flue gas pollutant it is efficient
Removal.
Embodiment 4
Hot water and steam is mixed with flue gas in step 1 generates sulfate ion or sulfite ion, and a part is logical along flue gas
Into impulse electric field described in step 3, another part is filled as remaining hot water and steam is discharged into water body purification along fusion pipeline
It sets and it is purified, purified water body is heated again through coal-burning boiler, for using in step 1, passes through water body purification
Device pair is cleared up with the mixed cleaning water body of flue gas, guarantees the recycling of cleaning water body；Work is attached in step 4
Property charcoal adsorption layer be honey comb structure, active carbon is attached with inside each group hole of honeycomb structure, after step 3 is handled
Flue gas from one end of adsorption layer to other end steady flow, remove the neutrophil granule carried in flue gas, guarantee that neutrophil granule is fast
Speed is efficiently removed.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie
In the case where without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power
Benefit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent elements of the claims
Variation is included within the present invention.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped
Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should
It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
The other embodiments being understood that.
Claims (8)
1. a kind of electric precipitation defogging method, which is characterized in that have following steps:
Step 1: Steam treatment flue gas:
Cleaning water body is carried out being heated to fluidized state in coal-fired boiler combustion, collects the hot steam of fluidized state, it will be coal-fired
The flue gas that boiler combustion generates is passed through in the hot water and steam, in flue gas in the flue dust of fine granularity, fog in conjunction with vapor
Generate larger-size grain structure, at the same hot water and steam can be reacted with the sulfur dioxide carried in flue gas generate sulfate radical from
Son or sulfite ion remove the sulfur dioxide contained in flue gas；
Step 2: pulse voltage handles flue gas:
Will by hot steam in step 1, treated that flue gas is passed through in impulse electric field, by impulse electric field by the acid in flue gas
It radical ion and is combined with electrical vapor and generates size larger particles structure and absorb, remove the particle of charging property in flue gas
Structure；
Step 3: high frequency voltage handles flue gas:
Will by step 2, treated that flue gas is passed through in high-frequency electric field, to clearing up halfway carried charge in the impulse electric field
Lesser grain structure carries out cleaning removal；
Step 4: active carbon layer handles flue gas:
By by step 3, treated that flue gas is passed through is attached with the adsorption layer of active carbon, to being carried in flue gas without electrical
Granular flue dust and fog is adsorbed, and the flue gas after the completion of adsorbing reaches discharge standard and is emitted into external environment.
2. a kind of electric precipitation defogging method according to claim 1, it is characterised in that: to cleaning water body in the step 1
It heats the hot water and steam generated the direction contrary with flue gas emission to merge, i.e. flue gas emission direction and hot steam pass-out side
To opposite, flue gas is mixed in merging pipeline with hot water and steam, and the caliber for merging pipeline is set as between 0.5-1.3m, institute
The length for stating fusion pipeline is set as 3-5m.
3. a kind of electric precipitation defogging method according to claim 1 or 2, it is characterised in that: hot water steams in the step 1
Vapour is mixed with flue gas generates sulfate ion or sulfite ion, and a part leads to the electricity of pulse described in step 3 along flue gas
In, another part purifies it as remaining hot water and steam is discharged into water purifying device along fusion pipeline, purified water
Body is heated again through the coal-burning boiler, for using in the step 1.
4. a kind of electric precipitation defogging method according to claim 1, it is characterised in that: by coal-fired pot in the step 1
Oxynitrides can be carried in the flue gas that furnace burning generates, oxynitrides is reacted with hot water and steam generates nitrate ion or Asia
Nitrate ion enters under flue gas drive and carries out next step cleaning in the step 2.
5. a kind of electric precipitation defogging method according to claim 1, it is characterised in that: impulse electric field in the step 2
Discharge inception voltage is set as 25kV, and the waveform valley of pulse voltage is set as 30kV, and peak impulse voltage is set as 60kV, and pulse is wide
Degree is set as 200ns, repetition rate 50Hz.
6. a kind of electric precipitation defogging method according to claim 1, it is characterised in that: adhere in the step 4 active
The adsorption layer of charcoal is honey comb structure, is attached with active carbon inside each group hole of honeycomb structure, treated by step 3
Flue gas removes the neutrophil granule carried in flue gas from one end of adsorption layer to other end steady flow.
7. a kind of electric precipitation defogging method according to claim 6, it is characterised in that: the honeycomb structure of the adsorption layer
Hole diameter be set as 1-5cm, integrally cylindrical structure and its diameter are set as 25-50cm, the suction to the adsorption layer
The thickness of attached layer is set as 0.5-2.5m.
8. a kind of electric precipitation defogging method according to claim 1, it is characterised in that: the one of adsorption layer in the step 4
End is communicated with force (forcing) pump.
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