CN107344788A - A kind of desulfurization wastewater treatment system - Google Patents
A kind of desulfurization wastewater treatment system Download PDFInfo
- Publication number
- CN107344788A CN107344788A CN201710786674.2A CN201710786674A CN107344788A CN 107344788 A CN107344788 A CN 107344788A CN 201710786674 A CN201710786674 A CN 201710786674A CN 107344788 A CN107344788 A CN 107344788A
- Authority
- CN
- China
- Prior art keywords
- desulfurization wastewater
- flue
- waste water
- treatment system
- wastewater treatment
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 102
- 230000023556 desulfurization Effects 0.000 title claims abstract description 102
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 42
- 239000002351 wastewater Substances 0.000 claims abstract description 117
- 238000001704 evaporation Methods 0.000 claims abstract description 60
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 claims abstract description 52
- 230000008020 evaporation Effects 0.000 claims abstract description 51
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 37
- 239000012530 fluid Substances 0.000 claims abstract description 31
- 238000000889 atomisation Methods 0.000 claims abstract description 25
- 239000000126 substance Substances 0.000 claims abstract description 25
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 claims abstract description 10
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910001424 calcium ion Inorganic materials 0.000 claims abstract description 10
- 229910001425 magnesium ion Inorganic materials 0.000 claims abstract description 10
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 20
- 239000003595 mist Substances 0.000 claims description 9
- 238000004140 cleaning Methods 0.000 claims description 8
- 230000008859 change Effects 0.000 claims description 5
- 238000010907 mechanical stirring Methods 0.000 claims description 4
- 230000003139 buffering effect Effects 0.000 claims description 2
- 238000005119 centrifugation Methods 0.000 claims description 2
- 235000019504 cigarettes Nutrition 0.000 claims description 2
- 239000002253 acid Substances 0.000 claims 1
- 239000003546 flue gas Substances 0.000 abstract description 20
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 16
- 238000006243 chemical reaction Methods 0.000 abstract description 15
- 230000000694 effects Effects 0.000 abstract description 15
- 238000000034 method Methods 0.000 abstract description 15
- 239000003517 fume Substances 0.000 abstract description 13
- 230000008569 process Effects 0.000 abstract description 13
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 abstract description 8
- 229910002092 carbon dioxide Inorganic materials 0.000 abstract description 5
- 239000001569 carbon dioxide Substances 0.000 abstract description 3
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 239000007791 liquid phase Substances 0.000 abstract description 3
- 238000012546 transfer Methods 0.000 abstract description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 abstract description 2
- 239000002245 particle Substances 0.000 description 9
- 238000012545 processing Methods 0.000 description 8
- 229910052739 hydrogen Inorganic materials 0.000 description 7
- 239000001257 hydrogen Substances 0.000 description 7
- -1 hydrogen salt Chemical class 0.000 description 7
- 230000003009 desulfurizing effect Effects 0.000 description 6
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 5
- 239000011591 potassium Substances 0.000 description 5
- 229910052700 potassium Inorganic materials 0.000 description 5
- 239000007921 spray Substances 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 230000008676 import Effects 0.000 description 3
- 238000005554 pickling Methods 0.000 description 3
- 239000010865 sewage Substances 0.000 description 3
- 239000003245 coal Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000012265 solid product Substances 0.000 description 2
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 description 1
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 235000012538 ammonium bicarbonate Nutrition 0.000 description 1
- 239000001099 ammonium carbonate Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000000909 electrodialysis Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 206010022000 influenza Diseases 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005373 pervaporation Methods 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000008400 supply water Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000002207 thermal evaporation Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/10—Treatment of water, waste water, or sewage by heating by distillation or evaporation by direct contact with a particulate solid or with a fluid, as a heat transfer medium
- C02F1/12—Spray evaporation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/504—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific device
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- 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
- B01D53/505—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound in a spray drying process
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/16—Treatment of water, waste water, or sewage by heating by distillation or evaporation using waste heat from other processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Hydrology & Water Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Water Supply & Treatment (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Inorganic Chemistry (AREA)
- Treating Waste Gases (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Abstract
The invention provides a kind of desulfurization wastewater treatment system, including waste water baffle-box；Pretreatment system, it is arranged on waste water baffle-box entrance point；For adding the bicarbonate chemicals dosing plant of bicarbonate into waste water baffle-box；Double fluid atomization nozzle, its air inlet are connected with air compressor machine, and water inlet is connected by water pump with the delivery port of waste water baffle-box.After desulfurization wastewater enters flue, start to evaporate in the presence of fume afterheat；Desulfurization wastewater can be with the SO in flue gas3React；Desulfurization wastewater is easily decomposed reaction in case of heating；The carbon dioxide of this two reaction generations will further speed up drop disturbance, also easily form secondary droplet, while the heat and mass transfer process of droplet and flue gas is necessarily accelerated in the reaction between liquid phase；In addition, the carbonate of generation can be nucleated with soluble calcium ions and magnesium ions fast reaction a small amount of in desulfurization wastewater, and heat is released, can effectively shorten droplet evaporation time, so as to improve wastewater zero discharge effect.
Description
Technical field
The present invention relates to waste water of heat-engine plant processing technology field, more specifically to a kind of desulfurization wastewater treatment system.
Background technology
The main sewage of coal-burning power plant has：Sanitary sewage, waste water containing coal, circulating water cooling tower sewer and desulfurization are given up
Water.The sewers such as sanitary sewage, waste water containing coal, circulating water cooling tower are typically after simple materialization, biochemical treatment as supply
Water circulation is in desulfurizing tower.Terminal waste water of the desulfurization wastewater as coal-burning power plant, there is water quality inferiority, complicated component, high salinity, hardly possible to return
With the features such as, be always the full factory waste water zero discharge in coal-burning power plant crucial problem.
The fume afterheat evaporation technique technique of zero discharge brand-new, efficient, economic as desulfurization wastewater, is realizing coal-burning power plant
Zero-emission is placed with larger application potential.The principle of the technology is to spray the desulfurization wastewater through gas-liquid dual-flow atomizer high atomisation
Enter into the flue between air preheater and deduster, under the heat effect of fume afterheat, droplet moisture is vaporized completely, and salt
Divide as moisture evaporation crystallizes into solid particle, caught by deduster and enter dry ash, so as to reach wastewater zero discharge.
For the unit that flue gas operating mode is complicated and changeable, desulfurization wastewater discharge capacity is big, more than guarantee desulfurization wastewater flue gas
The stability of thermal evaporation processing system, then need desulfurization wastewater carrying out minimizing processing.
For fume afterheat vapo(u)rization system, only the droplet actual evaporation time, which is less than droplet, allows evaporation time,
It can guarantee that the stability of system.The droplet actual evaporation time is together decided on by mist droplet particle size and its residing flue-gas temperature,
And droplet allow evaporation time to be determined by the ratio of evaporation flue length and flue gas flow rate.Therefore, larger atomizing particle size
Evaporation time needed for evaporating completely is longer, is relatively easily caused limited evaporation flue length and is difficult to meet that larger atomizing particle size is complete
Evaporation time needed for pervaporation；Or evaporation flue length is shorter, it is difficult to meets the evaporation needed for atomizing particle size evaporating completely
Time, it have impact on wastewater zero discharge effect.
In summary, evaporation time of the droplet of desulfurization wastewater in flue is evaporated how is shortened, to improve waste water zero-emission
Effect is put, is current those skilled in the art technical problem urgently to be resolved hurrily.
The content of the invention
In view of this, it is an object of the invention to provide a kind of desulfurization wastewater treatment system, to shorten the mist of desulfurization wastewater
The evaporation time dropped in evaporation flue, so as to improve wastewater zero discharge effect.
In order to achieve the above object, the present invention provides following technical scheme：
A kind of desulfurization wastewater treatment system, including waste water baffle-box, in addition to：
The pretreatment system of calcium ions and magnesium ions in desulfurization wastewater can be removed, the pretreatment system is arranged on the waste water and delayed
Rush case entrance point；
For adding the bicarbonate chemicals dosing plant of bicarbonate into the waste water baffle-box；
Double fluid atomization nozzle, the air inlet of the double fluid atomization nozzle are connected with air compressor machine, and water inlet passes through water pump
It is connected with the delivery port of the waste water baffle-box.
Preferably, in above-mentioned desulfurization wastewater treatment system, the bicarbonate chemicals dosing plant is sodium acid carbonate chemicals dosing plant
Or saleratus chemicals dosing plant；The mass fraction that the bicarbonate chemicals dosing plant adds bicarbonate is 5%~20%.
Preferably, in above-mentioned desulfurization wastewater treatment system, the bicarbonate chemicals dosing plant is arranged on the waste water buffering
The top of case.
Preferably, in above-mentioned desulfurization wastewater treatment system, in addition to the mechanical agitation being arranged in the waste water baffle-box
Device.
Preferably, in above-mentioned desulfurization wastewater treatment system, the air preheater and electric cleaner of the desulfurization wastewater treatment system
Between flue include：
Flue collector；
The bypass flue being arranged in parallel with the flue collector, the double fluid atomization nozzle position of the desulfurization wastewater treatment system
In being provided with imported valve in the bypass flue and close to entrance point, the entrance point of the bypass flue, the port of export is provided with
Outlet valve.
Preferably, in above-mentioned desulfurization wastewater treatment system, the centrifugation close to the port of export is additionally provided with the bypass flue
Blower fan, the distance of the double fluid atomization nozzle and the centrifugal blower are more than 20m.
Preferably, in above-mentioned desulfurization wastewater treatment system, the bypass flue is U-shaped flue, the middle part of the U-shaped flue
Straight flue section is parallel with the flue collector, and the double fluid atomization nozzle and the centrifugal blower are arranged at the straight cigarette in the middle part
Road section.
Preferably, in above-mentioned desulfurization wastewater treatment system, in addition to for detecting temperature in the straight flue section in the middle part
Temperature-detecting device, the temperature-detecting device include：
Along the length direction of the straight flue section in the middle part, from before the double fluid atomization nozzle at 1m to the two-fluid mist
Changing the distance between the multiple detector units, the two neighboring detector unit being uniformly arranged after nozzle at 20m is
1m。
Preferably, in above-mentioned desulfurization wastewater treatment system, also set between the waste water baffle-box and the pretreatment system
It is equipped with minimizing system.
Preferably, in above-mentioned desulfurization wastewater treatment system, in addition to evaporation tubes cleaning device, the evaporation tubes cleaning
The pipeline that device can flow through to the desulfurization wastewater containing bicarbonate carries out pickling successively and clear water rinses.
It can be seen from the above technical scheme that desulfurization wastewater treatment system provided by the invention includes waste water baffle-box；
The pretreatment system of calcium ions and magnesium ions in desulfurization wastewater can be removed, the pretreatment system is arranged on waste water baffle-box entrance point；With
In the bicarbonate chemicals dosing plant that bicarbonate is added into waste water baffle-box；Double fluid atomization nozzle, twin spray
The air inlet of mouth is connected with air compressor machine, and water inlet is connected by water pump with the delivery port of waste water baffle-box.
When the desulfurization wastewater treatment system is applied, the preprocessed system removal desulfurization of desulfurization wastewater flowed out by desulfurizing tower is given up
In water after calcium ions and magnesium ions, into waste water baffle-box；Then added by bicarbonate chemicals dosing plant in waste water baffle-box certain
The bicarbonate of amount；Then the desulfurization wastewater containing bicarbonate got by water pump under the air effect that air compressor machine provides,
Sprayed into through double fluid atomization nozzle in the flue between air preheater and electric cleaner, utilize fume afterheat taking off potassium-containing hydrogen salt
Sulphur waste water evaporates, and the solid product after evaporating enters electric cleaner, and then is collected and removed by electric cleaner；Two-fluid mist
The fogging degree of change nozzle is higher, and evaporation efficiency is higher.
After the desulfurization wastewater of potassium-containing hydrogen salt enters flue, start to evaporate in the presence of fume afterheat；On the one hand, contain
The desulfurization wastewater of bicarbonate can be with the SO in flue gas3Following reaction occurs：
2HCO3 -+SO3→SO4 2-+2CO2↑+H2O ①
On the other hand, following reaction easily occurs in case of heating for the desulfurization wastewater containing bicarbonate：
2HCO3 -→CO3 2-+CO2↑+H2O ②
The carbon dioxide of above-mentioned two reaction generation will further speed up drop disturbance, also easily form secondary mist
Drop, while the heat and mass transfer process of droplet and flue gas is necessarily accelerated in the reaction between liquid phase；In addition, the carbonic acid 2. generated in formula
Root can be nucleated with soluble calcium ions and magnesium ions fast reaction a small amount of in desulfurization wastewater, and release heat, can effectively be shortened
Droplet evaporation time, so can make desulfurization wastewater under larger atomizing particle size or allow shorter evaporation flue length under
Evaporating completely can still be realized.Therefore, evaporation of the droplet of desulfurization wastewater in flue is evaporated can be shortened by adding bicarbonate
Time, so as to improve wastewater zero discharge effect.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are the present invention
Some embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
These accompanying drawings obtain other accompanying drawings.
Fig. 1 is a kind of structural representation of embodiment of desulfurization wastewater treatment system provided in an embodiment of the present invention；
Fig. 2 is the structural representation of desulfurization wastewater treatment system another embodiment provided in an embodiment of the present invention.
In Fig. 1-2,1- boilers, 2- economizers, 3- air preheaters, 4- double fluid atomization nozzles, 5- electric cleaners, 6- desulfurization
Tower, 7- pretreatment systems, 8- minimizings system, 9- waste water baffle-box, 10- mechanical stirring devices, 11- bicarbonates dosing dress
Put, 12- water pumps, 13- air compressor machines, 14- temperature-detecting devices, 15- bypass flues, 16- centrifugal blowers.
Embodiment
The embodiments of the invention provide a kind of desulfurization wastewater treatment system, shortens the droplet of desulfurization wastewater in evaporation flue
In evaporation time, so as to improve wastewater zero discharge effect.
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
Part of the embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
Accompanying drawing 1-2 is refer to, desulfurization wastewater treatment system provided in an embodiment of the present invention includes waste water baffle-box 9；Can
The pretreatment system 7 of calcium ions and magnesium ions in desulfurization wastewater is removed, pretreatment system 7 is arranged on the entrance point of waste water baffle-box 9 and is used for
The bicarbonate chemicals dosing plant 11 of bicarbonate is added into waste water baffle-box 9；Double fluid atomization nozzle 4, twin spray
The air inlet of mouth 4 is connected with air compressor machine 13, and water inlet is connected by water pump 12 with the delivery port of waste water baffle-box 9.The present embodiment
In, the delivery port of waste water baffle-box 9 is connected with water pump 12, and the delivery port of water pump 12 is with the air of the offer of air compressor machine 13 in two-fluid
Atomizer 4 converges.
It should be noted that boiler 1, economizer 2, air preheater 3, electricity that desulfurization wastewater treatment system includes being sequentially connected remove
Dirt device 5, desulfurizing tower 6, pretreatment system 7, the import of waste water baffle-box 9 are connected with the outlet of pretreatment system 7；Also including can
The double fluid atomization nozzle 4 that desulfurization wastewater is atomized, the outlet of double fluid atomization nozzle 4 is arranged on air preheater 3 and electric cleaner 5
Between flue in.Pretreatment system 7 refers to neutralize, precipitates, flocculates, clarifying, softening, adjusting the traditional handicrafts such as pH processing road
Line, main purpose are to remove heavy metal, suspension and the calcium ions and magnesium ions in desulfurization wastewater, are a kind of conventional processing systems.
When the desulfurization wastewater treatment system is applied, the preprocessed system 7 of desulfurization wastewater flowed out by desulfurizing tower 6 removes desulfurization
In waste water after calcium ions and magnesium ions, into waste water baffle-box 9；Then added by bicarbonate chemicals dosing plant 11 in waste water baffle-box 9
Enter a certain amount of bicarbonate；Then the sky that the desulfurization wastewater containing bicarbonate got by water pump 12 provides in air compressor machine 13
Under gas effect, spray into the flue between air preheater 3 and electric cleaner 5 through double fluid atomization nozzle 4, will be contained using fume afterheat
The desulfurization wastewater evaporation of bicarbonate, the solid product after evaporating enters electric cleaner 5, and then is collected by electric cleaner 5
And remove；The fogging degree of double fluid atomization nozzle 4 is higher, and evaporation efficiency is higher.
After the desulfurization wastewater of potassium-containing hydrogen salt enters flue, start to evaporate in the presence of fume afterheat；On the one hand, contain
The desulfurization wastewater of bicarbonate can be with the SO in flue gas3Following reaction occurs：
2HCO3 -+SO3→SO4 2-+2CO2↑+H2O ①
On the other hand, following reaction easily occurs in case of heating for the desulfurization wastewater containing bicarbonate：
2HCO3 -→CO3 2-+CO2↑+H2O ②
The carbon dioxide of above-mentioned two reaction generation will further speed up drop disturbance, also easily form secondary mist
Drop, while the heat and mass transfer process of droplet and flue gas is necessarily accelerated in the reaction between liquid phase；In addition, the carbonic acid 2. generated in formula
Root can be nucleated with soluble calcium ions and magnesium ions fast reaction a small amount of in desulfurization wastewater, and release heat, can effectively be shortened
Droplet evaporation time, so can make desulfurization wastewater under larger atomizing particle size or allow shorter evaporation flue length under
Evaporating completely can still be realized.Therefore, evaporation of the droplet of desulfurization wastewater in flue is evaporated can be shortened by adding bicarbonate
Time, so as to improve wastewater zero discharge effect.
In addition, the present invention can shorten droplet evaporation time under the conditions of any flue structure and spray nozzle device is not changed,
Reduce processing cost, while improve adaptability of the whole desulfurization wastewater treatment system to various unit operating modes.And due to
Desulfurization wastewater containing bicarbonate can be with the SO in flue gas3React, so also there is cooperation-removal SO3Purpose.
Furthermore the desulfurization wastewater of the invention containing bicarbonate has carbonate generation after evaporating, the compound conduct
Chemical conditioning agent can make particle conductive increase, into after electric cleaner 5, improve the efficiency of dust collection of electric cleaner 5.And this hair
Bright technically reliable, it is easy to operate, strengthen atomizing effect using chemical reaction, react without any harmful product of generation, it is right
It is environment-friendly, there is good economic benefit and social benefit.
In specific embodiment, bicarbonate chemicals dosing plant 11 is that sodium acid carbonate chemicals dosing plant or saleratus dosing fill
Put.The present embodiment adds sodium acid carbonate into waste water baffle-box 9 by sodium acid carbonate chemicals dosing plant, or passes through saleratus dosing
Device adds saleratus into waste water baffle-box 9, preferentially relatively low from sodium acid carbonate, cost.Certainly, above-mentioned bicarbonate is also
Can be ammonium hydrogen carbonate etc..
Preferably, the mass fraction that bicarbonate chemicals dosing plant 11 adds bicarbonate is 5%~20%, can be in carbonic acid
Hydrogen salt add it is as far as possible few on the premise of shorten the evaporation time of desulfurization wastewater, so as to reduce cost.Certainly, according to heterogeneity
Desulfurization wastewater, the mass fraction that above-mentioned bicarbonate adds can also be other numerical value, such as 25%.
For the ease of adding for bicarbonate, bicarbonate chemicals dosing plant 11 is arranged on the top of waste water baffle-box 9.This
Sample, under gravity, the outlet bicarbonate can for opening bicarbonate chemicals dosing plant 11 enter waste water baffle-box 9, tie
Structure is simple, saves cost.Above-mentioned bicarbonate chemicals dosing plant 11 can also be arranged on the side of waste water baffle-box 9, by spiral
Pusher adds bicarbonate.
In order that bicarbonate mixes evenly with desulfurization wastewater, desulfurization wastewater treatment system also delays including being arranged on waste water
The mechanical stirring device 10 rushed in case 9.The present invention will add the bicarbonate in desulfurization wastewater by mechanical stirring device 10
The desulfurization wastewater containing bicarbonate is obtained after stirring.Certainly, the present invention can also be by shaking waste water baffle-box 9
Dynamic or rotation, makes its own have agitating function, to realize the same effect for mixing bicarbonate and desulfurization wastewater.
As shown in Fig. 2 in a specific embodiment of the invention, air preheater 3 and the electric cleaner 5 of desulfurization wastewater treatment system
Between flue include flue collector and the bypass flue 15 that is arranged in parallel with flue collector, the two-fluid mist of desulfurization wastewater treatment system
Change nozzle 4 to be located in bypass flue 15 and close to entrance point.The present invention draws a side between electric cleaner 5 and air preheater 3
Road flue 15, the desulfurization wastewater of potassium-containing hydrogen salt is evaporated using the fume afterheat in bypass flue 15, the final flue gas returns to
Before electric cleaner 5.Certainly, flue of the invention can also only include flue collector, i.e., be present in air preheater 3 and electricity in original structure
Flue between deduster 5, as shown in figure 1, being evaporated the desulfurization wastewater of potassium-containing hydrogen salt using the fume afterheat in flue collector.
For the ease of controlling the break-make of the flue gas of bypass flue 15, it is preferred that the entrance point of bypass flue 15 is provided with import
Valve, the port of export are provided with outlet valve.
In further technical scheme, the centrifugal blower 16 close to the port of export, two-fluid are additionally provided with bypass flue 15
The distance of atomizer 4 and centrifugal blower 16 is more than 20m.The distance can ensure droplet evaporating completely, ensure that waste water zero-emission
Put effect.When the atomizing particle size of droplet smaller (being less than 50 μm), the distance of double fluid atomization nozzle 4 and centrifugal blower 16 also may be used
With less than 20m, such as 18m.
Preferably, bypass flue 15 is U-shaped flue, and the straight flue section in middle part of U-shaped flue is parallel with flue collector, two-fluid mist
Change nozzle 4 and centrifugal blower 16 is arranged at the straight flue section in middle part.The U-shaped flue includes two end flue sections be arrangeding in parallel
And the straight flue section in middle part being vertically connected between two end flue sections, the flow of flue gas of the straight flue section in middle part is more steady,
Evaporation effect is higher.
In order to further optimize above-mentioned technical proposal, desulfurization wastewater treatment system also includes being used to detect the straight flue section in middle part
The temperature-detecting device 14 of interior temperature.It should be noted that because the condition of pipeline actual condition limits, evaporation time can not be straight
Connect and measure, but after droplet is injected to flue, flue-gas temperature has moderate tone after a decline with flue, reaches moderate tone
When, that is, think that droplet evaporates, the distance of equalized temperature point and nozzle after now declining is droplet evaporation distance.Cause
This, can determine the evaporation distance of droplet by said temperature detection means 14.
In the present embodiment, temperature-detecting device 14 includes the length direction along the straight flue section in middle part, is sprayed from twin
The multiple detector units being uniformly arranged before mouth 4 at 1m at 20m after double fluid atomization nozzle 4, two neighboring temperature detection
The distance between element is 1m.Detector unit is specially 22, and temperature detecting precision is higher, the droplet evaporation distance of acquisition
Accuracy is higher.Certainly, the present invention can also set a detector unit every 1.5m or 2m.
The present invention is carried out using the test platform of embodiment as shown in Figure 2 in by certain power plant.In order to strengthen experiment
The stability of platform, this experiment directly substitute desulfurization wastewater to investigate the water before and after addition bicarbonate to evaporation using process water
The influence of time.Comprise the following steps that：
1) according to schematic diagram shown in Fig. 2, all parts of pilot test platform are installed；
2) when 1 stable operation of boiler of power plant, import and export valve is opened, starts centrifugal blower 16, keeps certain in flue
Flue gas flow, and opening temperature detection means 14；
3) process water is squeezed into waste water baffle-box 9；
4) water pump 12, air compressor machine 13 are opened, and controls certain pressure and flow, the process water got by water pump 12 is in sky
It is injected in bypass flue 15 through double fluid atomization nozzle 4 under the air effect that press 13 provides, is then filled by temperature detection
Put the change of 14 observation flue temperatures；
5) after the temperature stabilization in above-mentioned flue, find temperature decline after the distance of equalization point and nozzle, this be without
The evaporation distance of the process water of sodium acid carbonate；
6) in the case where above-mentioned working condition keeps constant, a certain amount of sodium acid carbonate is added in process water, is configured
Into containing 10% sodium bicarbonate solution, repeat 4,5 above-mentioned steps, find the evaporation of the process water containing sodium acid carbonate away from
From；
7) after testing, jet pump 12, air compressor machine 13, centrifugal blower 16, imported valve, outlet valve are closed successively
Door.
The condition and result of experiment are as shown in the table：
| Sequence number | Project | Unit | Parameter |
| 1 | Flue gas flow | m3/h | 20000 |
| 2 | Flue-gas temperature | ℃ | 122 |
| 3 | Flue gas flow rate | m/s | 8.8 |
| 4 | Air compressor pressure | bar | 4 |
| 5 | Air compressor tolerance | Nm3/h | 93 |
| 6 | The pressure of water pump 12 | bar | 1.6 |
| 7 | The flow of water pump 12 | L/min | 1 |
| 8 | Evaporation distance during without sodium acid carbonate | m | 14 |
| 9 | Evaporation distance during containing sodium acid carbonate | m | 12 |
Above-mentioned result of the test shows, under operating mode of the same race and experimental condition, in process water add sodium acid carbonate after, evaporate away from
From 2m is reduced, evaporation time shortens 15%, shows after adding sodium acid carbonate, helps to shorten the evaporation time of droplet.
As shown in figure 1, minimizing system 8 is additionally provided between waste water baffle-box 9 and pretreatment system 7.For flue gas work
For the unit that condition is complicated and changeable, desulfurization wastewater discharge capacity is big, to ensure the steady of desulfurization wastewater fume afterheat evaporation process system
It is qualitative, desulfurization wastewater need to be subjected to minimizing processing, by pretreatment system 7 He of the desulfurization wastewater that desulfurizing tower 6 flows out through routine
Enter waste water baffle-box 9 after the processing of minimizing system 8.Minimizing system 8 refers to film process or electrodialysis process, water outlet pH value
For 7-8, the system main purpose is to reduce fume afterheat evaporating waste water amount, and it is steady to reduce cost, raising fume afterheat vapo(u)rization system
It is qualitative.The present invention can also be not provided with minimizing system 8, handle the only preprocessed system 7 of desulfurization wastewater that desulfurizing tower 6 flows out
Enter waste water baffle-box 9 afterwards.
Desulfurization wastewater treatment system also includes evaporation tubes cleaning device, and evaporation tubes cleaning device can be to containing carbonic acid
The pipeline that the desulfurization wastewater of hydrogen salt flows through carries out pickling successively and clear water rinses.When boiler 1 will be shut down, evaporation tubes cleaning
Device to whole evaporation tubes using the pickling of low concentration after, then rinsed with clear water, the desulfurization containing bicarbonate can be prevented
Waste water deposits in pipeline.The present invention can not also include evaporation tubes cleaning device.
Each embodiment is described by the way of progressive in this specification, what each embodiment stressed be and other
The difference of embodiment, between each embodiment identical similar portion mutually referring to.
The foregoing description of the disclosed embodiments, professional and technical personnel in the field are enable to realize or using the present invention.
A variety of modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The most wide scope caused.
Claims (10)
1. a kind of desulfurization wastewater treatment system, including waste water baffle-box (9), it is characterised in that also include：
The pretreatment system (7) of calcium ions and magnesium ions in desulfurization wastewater can be removed, the pretreatment system (7) is arranged on the waste water
Baffle-box (9) entrance point；
For adding the bicarbonate chemicals dosing plant (11) of bicarbonate into the waste water baffle-box (9)；
Double fluid atomization nozzle (4), the air inlet of the double fluid atomization nozzle (4) are connected with air compressor machine (13), and water inlet leads to
The delivery port that water pump (12) is crossed with the waste water baffle-box (9) is connected.
2. desulfurization wastewater treatment system according to claim 1, it is characterised in that the bicarbonate chemicals dosing plant (11)
For sodium acid carbonate chemicals dosing plant or saleratus chemicals dosing plant；The bicarbonate chemicals dosing plant (11) adds the matter of bicarbonate
It is 5%~20% to measure fraction.
3. desulfurization wastewater treatment system according to claim 1, it is characterised in that the bicarbonate chemicals dosing plant (11)
It is arranged on the top of the waste water baffle-box (9).
4. desulfurization wastewater treatment system according to claim 1, it is characterised in that also include being arranged on the waste water buffering
Mechanical stirring device (10) in case (9).
5. desulfurization wastewater treatment system according to claim 4, it is characterised in that the sky of the desulfurization wastewater treatment system
Flue between pre- device (3) and electric cleaner (5) includes：
Flue collector；
The bypass flue (15) being arranged in parallel with the flue collector, the double fluid atomization nozzle (4) are located at the bypass flue
(15) imported valve is provided with and close to entrance point, the entrance point of the bypass flue (15), the port of export is provided with outlet valve
Door.
6. desulfurization wastewater treatment system according to claim 5, it is characterised in that also set up in the bypass flue (15)
There is the centrifugal blower (16) of the close port of export, the double fluid atomization nozzle (4) and the distance of the centrifugal blower (16) are more than
20m。
7. desulfurization wastewater treatment system according to claim 6, it is characterised in that the bypass flue (15) is U-shaped cigarette
Road, the straight flue section in middle part of the U-shaped flue is parallel with the flue collector, the double fluid atomization nozzle (4) and the centrifugation
Blower fan (16) is arranged at the straight flue section in the middle part.
8. desulfurization wastewater treatment system according to claim 7, it is characterised in that also include straight for detecting the middle part
The temperature-detecting device (14) of temperature in flue section, the temperature-detecting device (14) include：
Along the length direction of the straight flue section in the middle part, from before the double fluid atomization nozzle (4) at 1m to the two-fluid mist
Change the distance between multiple detector units, the two neighboring detector unit that nozzle (4) is uniformly arranged at 20m afterwards
For 1m.
9. desulfurization wastewater treatment system according to claim 1, it is characterised in that the waste water baffle-box (9) with it is described
Minimizing system (8) is additionally provided between pretreatment system (7).
10. according to the desulfurization wastewater treatment system described in claim any one of 1-9, it is characterised in that also including evaporation tubes
Cleaning device, the evaporation tubes cleaning device can carry out acid successively to the pipeline that the desulfurization wastewater containing bicarbonate flows through
Wash and rinsed with clear water.
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| CN108176202A (en) * | 2017-12-26 | 2018-06-19 | 北京亘源环保有限公司 | A kind of preparation method and application of desulfuration adsorbent |
| CN108751562A (en) * | 2018-08-29 | 2018-11-06 | 上海电气电站环保工程有限公司 | A kind of industrial wastewater treatment system |
| CN109557062A (en) * | 2018-12-10 | 2019-04-02 | 徐州工程学院 | A kind of desulfurization wastewater drop evaporation test device and test method |
| CN111747588A (en) * | 2020-05-29 | 2020-10-09 | 华电电力科学研究院有限公司 | Large-flow high-salinity wastewater full-load continuous flue gas evaporation zero-emission treatment process |
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| CN107344788B (en) | 2023-11-14 |
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