CN205528225U - Desulfurization waste water zero release processing system - Google Patents
Desulfurization waste water zero release processing system Download PDFInfo
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- CN205528225U CN205528225U CN201620232812.3U CN201620232812U CN205528225U CN 205528225 U CN205528225 U CN 205528225U CN 201620232812 U CN201620232812 U CN 201620232812U CN 205528225 U CN205528225 U CN 205528225U
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- 239000002351 wastewater Substances 0.000 title claims abstract description 68
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 41
- 230000023556 desulfurization Effects 0.000 title claims abstract description 39
- 238000012545 processing Methods 0.000 title abstract description 5
- 150000003839 salts Chemical class 0.000 claims abstract description 36
- 239000013078 crystal Substances 0.000 claims abstract description 33
- 238000002425 crystallisation Methods 0.000 claims abstract description 29
- 230000008025 crystallization Effects 0.000 claims abstract description 29
- 239000012141 concentrate Substances 0.000 claims abstract description 18
- 238000001035 drying Methods 0.000 claims abstract description 14
- 238000010992 reflux Methods 0.000 claims abstract description 14
- 238000012856 packing Methods 0.000 claims abstract description 13
- 239000000126 substance Substances 0.000 claims description 31
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 25
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 25
- 208000028659 discharge Diseases 0.000 claims description 24
- 235000011152 sodium sulphate Nutrition 0.000 claims description 20
- 238000000151 deposition Methods 0.000 claims description 16
- 238000011084 recovery Methods 0.000 claims description 16
- 230000001351 cycling effect Effects 0.000 claims description 13
- 230000018044 dehydration Effects 0.000 claims description 13
- 238000006297 dehydration reaction Methods 0.000 claims description 13
- 238000005189 flocculation Methods 0.000 claims description 12
- 230000016615 flocculation Effects 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 10
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 10
- 239000010802 sludge Substances 0.000 claims description 10
- 125000001741 organic sulfur group Chemical group 0.000 claims description 8
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 claims description 5
- 230000004087 circulation Effects 0.000 abstract description 9
- 238000004134 energy conservation Methods 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 27
- 239000003814 drug Substances 0.000 description 26
- 230000006835 compression Effects 0.000 description 13
- 238000007906 compression Methods 0.000 description 13
- 238000000034 method Methods 0.000 description 13
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 12
- 238000001704 evaporation Methods 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 9
- 230000008020 evaporation Effects 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 8
- 229910001385 heavy metal Inorganic materials 0.000 description 8
- 239000002244 precipitate Substances 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 238000000926 separation method Methods 0.000 description 8
- 239000003546 flue gas Substances 0.000 description 7
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 6
- 239000011575 calcium Substances 0.000 description 6
- 239000003344 environmental pollutant Substances 0.000 description 6
- 229910052602 gypsum Inorganic materials 0.000 description 6
- 239000010440 gypsum Substances 0.000 description 6
- 231100000719 pollutant Toxicity 0.000 description 6
- 239000011780 sodium chloride Substances 0.000 description 6
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 4
- 229910001424 calcium ion Inorganic materials 0.000 description 4
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000004064 recycling Methods 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 3
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 229940079593 drug Drugs 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000007701 flash-distillation Methods 0.000 description 3
- 229910001425 magnesium ion Inorganic materials 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000007781 pre-processing Methods 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000002203 pretreatment Methods 0.000 description 2
- 238000010025 steaming Methods 0.000 description 2
- 239000006228 supernatant Substances 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 230000008719 thickening Effects 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 1
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical class OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910052925 anhydrite Inorganic materials 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000017531 blood circulation Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- 229910001634 calcium fluoride Inorganic materials 0.000 description 1
- 235000010261 calcium sulphite Nutrition 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 238000005352 clarification Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000010908 plant waste Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 230000000153 supplemental effect Effects 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 230000026676 system process Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
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- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Abstract
The utility model provides a desulfurization waste water zero release processing system, soften preliminary treatment portion, steam crystallization portion and dehydrating drying packing portion including the two -stage, the two -stage is softened preliminary treatment portion and is softened the unit including soft unit of the one -level of connecting in order and second grade, steam crystallization portion is including the unit of intaking, circulation unit and retrieve the unit, and the unit of intaking is connected with the circulation unit, retrieves the unit and is connected with the unit of intaking via the circulation unit, and the second grade softens the unit and is connected with the unit of intaking, dehydrating drying packing portion includes the concentrate reflux unit that softens the unit connection with the one -level to and salt crystal packing unit. This system has the characteristics of simple and convenient, economic energy -conservation of operation and salt crystal resourcebility utilization.
Description
Technical field
This utility model belongs to energy-conserving and environment-protective technical field, relates to a kind of desulfurization wastewater zero-discharge treatment system.
Background technology
Along with fast development and the construction of large coal-fired power plant of China's economic society, produced flue gas pair
Environmental pollution threatens greatly, flue gas carries out desulfurization process and increasingly comes into one's own, and coal-burning power plant is the most all
Auxiliary construction flue gas desulfurization facilities.Limestone-gypsum wet desulfuration is most, technology of applying in the world
The most ripe sulfur removal technology.Limestone-gypsum wet desulfuration is to use agstone serosity at reaction tower
Inside spray in flue gas, react generation CaSO3 with SO2, after forcing oxidation, form by-produced gypsum
(CaSO4 2H2O) finally discharges, SO in degraded flue gas2.Limestone-gypsum method flue gas desulfurization
In system, system is run that to adversely affect bigger be the enrichment of chloride ion.Chlorine during general operation
It is 2%～3.5% that content controls.In order to prevent soluble fraction material concentration in flue gas from exceeding setting and guarantor
Card gypsum quality, it is necessary to arrange a certain amount of waste water from system, to maintain the impurity concentration absorbing serosity not
Exceed the design upper limit.The serosity discharged, after dewaterer separates, forms solid Gypsum Fibrosum and waste water.
Desulfurization wastewater mainly includes float, and (SS, mainly by gypsum particle, SiO2, the hydrogen-oxygen of Al and Fe
Compound etc. form), Organic substance (CODCr), heavy metal, fluoride, oversaturated sulphite,
Sulfate, the pollutant such as chloride, TDS is higher.In desulfurization wastewater, a lot of pollutant are " integrated wastewater
Discharge standard " (GB8978-1996) middle first kind pollutant requiring to control.Wherein Organic substance
(CODCr) content is generally 150～400mg/L, float (SS) up to 60000～
70000mg/L, chloride ion content reaches about 20000mg/L, sulfate ion content simultaneously
About 2000mg/L.Desulfurization wastewater is very serious to the pollution of environment, and desulfurization wastewater is carried out individual processing
Even up to zero-emission, is very important.
Research currently, with respect to desulfurization wastewater zero-discharge technology is a lot, and domestic also have several power plant real
Existing desulfurization wastewater zero-emission through engineering approaches application.In Heyuan power plant desulfurization wastewater zero discharge, apply " two
Level softening pretreatment+" technique obtains good effect in multiple-effect evaporation crystallization.But owing to using Calx (Ca
(OH)2), soda (Na2CO3) as softening medicament, medicament is costly；Use multiple-effect evaporation
Crystallization technique, energy consumption is higher.Some power plant use steam mechanical recompression (MVR), due to not
Carrying out waste water and soften pretreatment, cause the easy fouling of system, need frequent clean, operation maintenance difficulty is big,
And crystal salt is mixed salt after evaporation, it is difficult to recycling, final disposal costly, easily causes secondary
Pollute.In general, current desulfurization wastewater zero discharge treatment exists pre-treatment medicaments costly, energy consumption
Greatly, the easy fouling of system, the problem that operation maintenance is difficult, crystal salt recycling is difficult.
Utility model content
The purpose of this utility model is to overcome above-mentioned deficiency, it is provided that a kind of desulfurization wastewater zero discharge treatment
System, solves the wastewater zero discharge problem during current desulfurization wastewater processes, and the pre-place that system exists
Reason medicament is costly, energy consumption is big, the easy fouling of system, operation maintenance are difficult, crystal salt recycling is difficult
Problem.
This utility model provides a kind of desulfurization wastewater zero-discharge treatment system, including: two-stage softens pre-place
Reason portion, steam crystallization unit and dehydration and drying packing portion, described two-stage softens pretreatment portion and includes sequentially connecting
The one-level pliable cell connect and secondary softening unit；Described steam crystallization unit includes inlet unit, circulation
Unit and recovery unit, described inlet unit is connected with described cycling element, described recovery unit warp
Being connected with described inlet unit by cycling element, described secondary softening unit is connected with described inlet unit
Connect；Described dehydration and drying packing portion includes the concentrated solution reflux unit being connected with described one-level pliable cell,
And crystal salt packaged unit.
Preferably, described one-level pliable cell includes being sequentially connected with one-level three header, one-level depositing reservoir with
And one-level sludge dewatering equipment, described one-level three header is connected respectively Calx chemicals dosing plant and sodium sulfate adds
Medicine device, flocculant chemicals dosing plant and flocculation aid chemicals dosing plant；Described secondary softening unit includes sequentially
Two grade of three header, two grades of depositing reservoirs and the secondary sludge dewaterer connected, described two grade of three header is respectively
Corresponding soda chemicals dosing plant and the organic sulfur chemicals dosing plant of connecting, described one-level depositing reservoir and described two grade three
The input of header is connected.
Preferably, described inlet unit includes the pretreatment filtered water tank being sequentially connected with, feed pump and changes in advance
Hot device；Described cycling element includes main heat exchanger, flash tank, circulating pump, flash valve and concentrate row
Putting valve, the waterwater entrance of described main heat exchanger is connected with the wastewater outlet of described pre-heat exchanger, described master
The wastewater outlet of heat exchanger is connected with described flash tank via flash valve, the outlet at bottom of described flash tank
It is connected with waterwater entrance and the concentrate drain valve of described main heat exchanger respectively via circulating pump.
Preferably, described steam crystallization unit also includes the steam supplementary units being connected with described main heat exchanger,
The pipeline of described steam supplementary units is provided with to nourish and fills steam valve.
Preferably, described recovery unit includes vapour compression machine and steam trap, described vapour compression machine via
The recovery entrance reclaiming entrance, recovery outlet and steam trap and described pre-heat exchanger of described main heat exchanger
It is connected.
Preferably, described crystal salt packaged unit includes the cyclone being sequentially connected with, centrifugal dehydrator, does
Dry fluid bed and baling press；Described concentrated solution reflux unit includes the concentrated solution being connected with described cyclone
Container and concentrated solution reflux pump.
The desulfurization wastewater zero-discharge treatment system that this utility model provides, two-stage softens pretreatment portion, steam
Crystallization unit and dehydration and drying packing portion, based on the steam crystallization unit of steam mechanical recompression, coordinate
Two-stage softens preconditioning technique, preferably Calx (Ca (OH)2)+sodium sulfate (Na2SO4)+pure
Alkali (Na2CO3) as softening medicament and remaining in carrying out recovery system by concentrated solution reflux unit
Sodium sulfate (Na2SO4) as softening medicament, utilize evaporation and concentration and the knot of integral type evaporation and crystallization system
Brilliant process, reaches desulfurization wastewater zero-emission and crystal salt resource.Therefore, this system can realize desulfurization
Wastewater zero discharge, can form again crystal salt resource, it is to avoid crystal salt causes secondary pollution problem.Simultaneously
In preferably softening medicament recovery system due to this technology, remaining sodium sulfate (Na2SO4) is as softening
Medicament, and efficiently, steam crystallization unit that scale-preventing performance is good, operation is easy, warp to make this system have
The feature that the energy-conservation and crystal salt resourcebility of helping utilizes.
Accompanying drawing explanation
Fig. 1 is the structural representation of this utility model desulfurization wastewater zero-discharge treatment system.
Detailed description of the invention
For the benefit of the understanding to structure of the present utility model, illustrates below in conjunction with drawings and Examples.
Fig. 1 is the structural representation of this utility model desulfurization wastewater zero-discharge treatment system.In conjunction with Fig. 1 institute
Showing, this utility model provides a kind of desulfurization wastewater zero-discharge treatment system, including: two-stage softens pre-
Process portion 40, steam crystallization unit 50 and dehydration and drying packing portion 60, described two-stage softens pretreatment portion
40 include one-level pliable cell 41 and the secondary softening unit 42 being sequentially connected with；Described steam crystallization unit
50 include inlet unit 51, cycling element 52 and recovery unit 53, and described inlet unit 51 is with described
Cycling element 52 is connected, and described recovery unit 53 is via cycling element 52 and described inlet unit 51 phase
Connecting, described secondary softening unit 42 is connected with described inlet unit 51；Described dehydration and drying packing portion
60 include the concentrated solution reflux unit 62 being connected with described one-level pliable cell 41, and crystal salt pack slip
Unit 61.
Described one-level pliable cell 41 includes one-level three header 1, the one-level depositing reservoir 2 and being sequentially connected with
Level sludge dewatering equipment 11, described one-level three header 1 is connected respectively Calx chemicals dosing plant 5 and sodium sulfate adds
Medicine device 6, flocculant chemicals dosing plant 7 and flocculation aid chemicals dosing plant 8；
Described secondary softening unit 42 includes 3, the two grades of depositing reservoirs 4 and two of two grade of three header being sequentially connected with
Level sludge dewatering equipment 12, described two grade of three header 3 is connected respectively soda chemicals dosing plant 9 and organic sulfur
Chemicals dosing plant 10, described one-level depositing reservoir 2 is connected with the input of described two grade of three header 3.
Described inlet unit 51 includes pretreatment filtered water tank 13, feed pump 14 and the pre-heat exchange being sequentially connected with
Device 15；Described cycling element 52 includes main heat exchanger 18, flash tank 16, circulating pump 17, flash valve 21
And the waste water of concentrate drain valve 20, the waterwater entrance of described main heat exchanger 18 and described pre-heat exchanger 15
Outlet is connected, and the wastewater outlet of described main heat exchanger 18 is connected with described flash tank 16 via flash valve 21
Connect, the outlet at bottom of described flash tank 16 via circulating pump 17 respectively waste water with described main heat exchanger 18 enter
Mouth and concentrate drain valve 20 are connected.
Described steam crystallization unit 50 also includes the steam supplementary units being connected with described main heat exchanger 18, described
The pipeline of steam supplementary units is provided with to nourish and fills steam valve 24.
Described recovery unit 53 includes vapour compression machine 19 and steam trap 22, described vapour compression machine 19 warp
By the recovery entrance of described main heat exchanger 18, reclaim outlet and steam trap 22 and described pre-heat exchanger 15
Recovery entrance be connected.
Described crystal salt packaged unit 61 includes the cyclone 25 being sequentially connected with, centrifugal dehydrator 26, does
Dry fluid bed 27 and baling press 28；Described concentrated solution reflux unit 62 includes and described cyclone 25
The concentrated solution container 29 being connected and concentrated solution reflux pump 30.
Hereinafter the concrete application specific details of the desulfurization wastewater zero-discharge treatment system that this utility model provides is carried out
Describe in detail.
In actual application, desulfurization wastewater zero-discharge treatment system as shown in Figure 1, there is two-stage and soften
Pretreatment portion, steam mechanical recompression (MVR) integral type evaporated crystallization device (steam crystallization unit) with
And dehydration and drying packing portion.
Two-stage soften pretreatment portion by one-level pliable cell (include one-level three header 1, one-level depositing reservoir 2,
Calx chemicals dosing plant 5, sodium sulfate chemicals dosing plant 6, flocculant chemicals dosing plant 7, flocculation aid chemicals dosing plant 8,
One-level sludge dewatering equipment system 11) and secondary softening unit (include 3, two grades of depositing reservoirs 4 of two grade of three header,
Soda chemicals dosing plant 9, organic sulfur chemicals dosing plant 10, secondary sludge dewaterer system 12) composition.
Steam mechanical recompression (MVR) integral type evaporated crystallization device (steam crystallization unit) is main by entering
Water unit (including pretreatment filtered water tank 13, feed pump 14, pre-heat exchanger 15, water intaking valve 23), follow
Ring element (includes that flash tank 16, circulating pump 17, main heat exchanger 18, flash valve 21, concentrate discharge
Valve 20), recovery unit (including vapour compression machine 19, steam trap 22), steam supplementary units (include
Steam valve 24 is filled in nourishing of being connected with main heat exchanger 18 assembly) composition.
Described crystal salt packaged unit is by cyclone 25, centrifugal dehydrator 26, drying fluidized-bed 27, packing
Machine 28 forms.
Concentrated solution reflux unit is made up of concentrated solution container 29, concentrated solution reflux pump 30.
During use, the desulfurization wastewater A after homogenizing all measures regulation enters one-level three header 1, and Calx dosing fills
Put 5, sodium sulfate chemicals dosing plant 6, flocculant chemicals dosing plant 7, flocculation aid chemicals dosing plant 8 the most quantitatively add
Calx, sodium sulfate, flocculant, flocculation aid to each reaction chamber, calcium ions and magnesium ions, heavy metal, fluorine in waste water
The pollutant such as compound produce indissoluble precipitate with softening medicament generation chemical reaction, and through flocculation reaction shape
Become the floc particle being prone to precipitation, subsequently into one-level depositing reservoir 2, carry out clarified separation.One-level is clarified
Rear supernatant enters two grade of three header 3, and soda chemicals dosing plant 9, organic sulfur chemicals dosing plant 10, flocculant add
Medicine device 7, flocculation aid chemicals dosing plant 8 the most quantitatively add soda, organic sulfur, flocculant, flocculation aid extremely
Each reaction chamber, in waste water remain calcium ion, heavy metal, etc. pollutant with soften medicament produce chemical reaction
And produce indissoluble precipitate, and form the floc particle being prone to precipitation through flocculation reaction, subsequently into two grades
Depositing reservoir 4, carries out clarified separation, and after two grades of clarifications, supernatant enters pretreatment filtered water tank 13.One-level is clear
The precipitate that clear pond separates carries out thickening process through one-level sludge dewatering equipment 11, outside the mud cake B of generation
Fortune is disposed, and one-level dewaterer separation liquid is back to one-level three header water inlet.Sinking of two grades of depositing reservoir separation
Shallow lake thing carries out thickening process through secondary sludge dewaterer 12, and the mud cake C outward transport of generation is disposed, two grades
Dewaterer separation liquid is back to two grade of three header water inlet.
In pretreatment filtered water tank 13, waste water enters steam mechanical recompression (MVR) integral type evaporative crystallization dress
Putting (steam crystallization unit), this device divides four unit, and each unit function is as follows:
Inlet unit: automatically can supplement waste water to system.
Cycling element: forced circulation system makes waste water high-speed circulating in systems, enters in external heat exchanger
Row heating, produces live steam concentrating in flash tank, and this unit has the circulation of high flow rate and makes and is
System is very efficient, and realizes self-cleaning and scale inhibition.
Recovery unit: flash tank outlet low-pressure steam heats up through vapour compression machine boosting, compressed steam
Being heated to waste water by two-stage heat exchanger, finally transfer heat to waste water, steam is condensed into water to be carried out back
Receive.Concentrate concentrated thing drain valve is discharged and is reclaimed.
Steam supplementary units: by indirect heat exchange to system additional heat, typically enter at system start-up phase
OK.
After pretreatment, waste water is entered steam crystallization unit by inlet unit, through the feed pump 14 liters in evaporative crystallization portion
After pressure, first carrying out preheating intensification through pre-heat exchanger 15, it is cold that pre-heat exchanger thermal source is that main heat exchanger 18 produces
Lime set.
After pre-heat exchange, waste water enters cycling element, mixes with high-speed circulating concentrate.Circulation concentrate from
Flash tank 16 outlet at bottom is connected with circulating pump 17 import, is pressurizeed by circulating pump, then through main heat exchanger 18
Heat exchange heats up, and main heat exchanger thermal source is steam or supplementary steam after vapour compression machine 19 compression heats up.Through master
Heat exchanger intensification Posterior circle concentrate enters flash tank 16 through flash valve 21 and carries out flash distillation.Concentrate in flash tank
Liquid constantly circulates, heats up, flash distillation, until concentrated solution is concentrated to controlled cycles of concentration, can pass through flash distillation
In tank, steam pressure or temperature are controlled.Waste water is after being concentrated to certain multiple, oversaturated in waste water
Sodium chloride (NaCl) crystallizes out at flash tank, forms crystal salt.In blood circulation high-speed circulating effect
Under, crystal salt is thoroughly mixed with concentrated solution.After concentration, concentrate concentrated thing drain valve 20 is discharged.
Main heat exchanger main heating source is steam after vapour compression machine 19 compression heats up.Flash tank 16 overhead vapor
Outlet is connected with vapour compression machine 19 import, heats up through vapour compression machine 19 compression, and after intensification, steam enters
Main heat exchanger, heats circulation concentrated solution.As pre-heat exchanger after steam trap 22 after exhaust steam discharge
Thermal source, again heat exchange.After twice heat exchange, steam condensate F reclaims standby.
Main heat exchanger supplemental heat source, for supplementing steam D, typically uses at system start-up phase.By nourishing
Fill steam valve 24, supplement steam and enter main heat exchanger 18, circulation concentrated solution heat exchange is heated up.
The concentrate that concentrate drain valve 20 is discharged comprises crystal salt and concentrated solution.Concentrate is through dehydrate
After packaging system processes, crystal salt therein is separated, and reaches standard product requirement, can resource
Change and utilize.Concentrate first carries out cyclonic separation through cyclone 25, and crystal salt separates laggard centrifuge dehydration
The further centrifuge dehydration of machine 26, after dehydration, crystal salt is dried by drying fluidized-bed again, with packing after drying
Machine is packed.
Cyclone 25 and the isolated concentrated solution of centrifugal dehydrator 26 are collected to concentrated solution container 29.Pass through
In concentrated solution return-flow system, concentrated solution reflux pump 30 is back to one-level three header 1, and in concentrated solution, sodium sulfate is made
Use is reclaimed for softening medicament.
The concrete technology of native system comprises the steps:
1) one-level softens: use Calx (Ca (OH)2) and sodium sulfate (Na2SO4) as one-level
Softening medicament, put in desulfurization wastewater, make desulfurization wastewater be sufficiently mixed with it, pH value reaches 10.5
Left and right, magnesium ion in waste water, major part heavy metal ion, fluorion etc. and Ca (OH)2、Na2SO4
React, be quickly generated the magnesium hydroxide of indissoluble, the hydroxide of heavy metal, calcium fluoride, calcium sulfate
Deng precipitate；Add flocculant, make waste water reacts the precipitate of generation and float flocculation, and
One-level depositing reservoir separates；
2) secondary softening: use soda (Na2CO3) and organic sulfur as secondary softening medicament, by it
Put into after one-level softens in desulfurization wastewater, make desulfurization wastewater be sufficiently mixed with it, the residual in waste water
Calcium ion, heavy metal ion etc. and Na2CO3, organic sulfur react, be quickly generated the carbonic acid of indissoluble
The precipitate such as calcium, heavy metal indissoluble thing；Add flocculant, make the precipitate flocculation that reaction generates, and
Separate at two grades of depositing reservoirs；
3) through the pretreated desulfurization wastewater of secondary softening, the steaming efficient, scale-preventing performance is good is utilized
It is evaporated concentrating, crystallizing by vapour mechanical recompression (MVR) integral type evaporated crystallization device, and controls
Waste water concentrating multiple processed, forms crystal salt, predominantly NaCl；Concentrated solution after crystal salt separation, predominantly
NaCl and sodium sulfate mixed solution；
4) above-mentioned crystal salt is through dehydration, dried, and sodium chloride purity reaches more than 97.5%, reaches " work
Industry salt " (GB/T 5462) refining industrial salt standard, and pack, reach resourcebility and utilize.
5) after above-mentioned crystal salt separates, concentrated solution is back to one-level softening preprocessing process, is used as to soften medicine
Agent.
The desulfurization wastewater zero-discharge treatment system that this utility model provides, has the feature that
One, native system uses two-stage to soften pretreatment+steam mechanical recompression (MVR) integral type steaming
Send out crystallization apparatus, by preferred pretreatment medicament, control evaporating, concentrating and crystallizing system cycles of concentration, concentration
Liquid backflow is reclaimed sodium sulfate and is organically combined as softening the technology such as medicament, is combined into a complete technique body
System, had both run simplicity, economical and energy saving, can realize again crystal salt resource.
Its two, the preferred Calx of native system (Ca (OH)2)+sodium sulfate (Na2SO4)+soda (Na2CO3)
As mainly softening medicament, and reclaim sodium sulfate (Na2SO4) in concentrated solution, with use sodium hydroxide,
Soda (Na2CO3) etc. compare as softening medicament, medicament is cheap, significantly saves operating cost.
Its three, native system use two-stage sofening treatment, integration evaporation and crystallization system energy-efficient, self
Good antiscale property function is strong, it is to avoid equipment scaling and frequent clean, runs simplicity.
Its four, after the evaporation of native system waste water, crystal salt purity is high, and resourcebility utilizes, it is to avoid crystal salt two
Secondary pollution problem.
In sum, native system has operation easy (less scaling, need not frequent clean), economic joint
The feature of energy (medicament expense is low, vapo(u)rization system energy consumption is low), it can not only realize desulfurization wastewater zero-emission
Processing, prevent the pollution of the environment, and the crystal salt purity produced is high, resourcebility utilizes, and will not bring
Secondary pollution.
It addition, multiple technology and processing step are combined into one by native system, mutual synergism,
For Desulphurization for Coal-fired Power Plant waste water characteristic, first carry out softening pretreatment and add relatively cheap softening medicine
In agent, with waste water, the pollutant reaction such as calcium ions and magnesium ions, heavy metal, fluorion, siliceous class material forms difficulty
Insoluble precipitate, clarified separation from waste water, it is to avoid the purity of above-mentioned impurity effect crystal salt, prevent simultaneously
Only fouling in system；Waste water enters steam crystallization unit after softening pretreatment and is evaporated concentrating and knot
Crystalline substance, by controlling evaporation and concentration multiple, makes sodium chloride in waste water (NaCl) crystallize out, but sodium sulfate
(Na2SO4) stay in concentrated solution, it is ensured that crystal salt purity；And be back to soften by concentrated solution after evaporation
Preprocessing process, reclaims sodium sulfate (Na therein2SO4) as softening medicament, reduce pre-treatment medicaments
Consume；The crystal salt formed is packed after dehydration, dried again, reaches recycling.
Above in association with accompanying drawing embodiment, this utility model is described in detail, ordinary skill in this area
This utility model can be made many variations example by personnel according to the above description.Thus, some in embodiment
Details should not constitute restriction of the present utility model, and this utility model will define with appended claims
Scope is as protection domain.
Claims (5)
1. a desulfurization wastewater zero-discharge treatment system, it is characterised in that including: two-stage softens pretreatment portion, steam crystallization unit and dehydration and drying packing portion, described two-stage softens one-level pliable cell and the secondary softening unit that pretreatment portion includes being sequentially connected with；Described steam crystallization unit includes inlet unit, cycling element and recovery unit, described inlet unit is connected with described cycling element, described recovery unit is connected with described inlet unit via cycling element, and described secondary softening unit is connected with described inlet unit；Described dehydration and drying packing portion includes the concentrated solution reflux unit being connected with described one-level pliable cell, and crystal salt packaged unit.
Desulfurization wastewater zero-discharge treatment system the most according to claim 1, it is characterized in that, described one-level pliable cell includes that one-level three header, one-level depositing reservoir and the one-level sludge dewatering equipment being sequentially connected with, described one-level three header are connected respectively Calx chemicals dosing plant and sodium sulfate chemicals dosing plant, flocculant chemicals dosing plant and flocculation aid chemicals dosing plant；
Described secondary softening unit includes two grade of three header being sequentially connected with, two grades of depositing reservoirs and secondary sludge dewaterer, described two grade of three header is connected respectively soda chemicals dosing plant and organic sulfur chemicals dosing plant, and described one-level depositing reservoir is connected with the input of described two grade of three header.
Desulfurization wastewater zero-discharge treatment system the most according to claim 1, it is characterised in that described inlet unit includes pretreatment filtered water tank, feed pump and the pre-heat exchanger being sequentially connected with；Described cycling element includes main heat exchanger, flash tank, circulating pump, flash valve and concentrate drain valve, the waterwater entrance of described main heat exchanger is connected with the wastewater outlet of described pre-heat exchanger, the wastewater outlet of described main heat exchanger is connected with described flash tank via flash valve, and the outlet at bottom of described flash tank is connected with waterwater entrance and the concentrate drain valve of described main heat exchanger respectively via circulating pump.
Desulfurization wastewater zero-discharge treatment system the most according to claim 3, it is characterised in that described steam crystallization unit also includes the steam supplementary units being connected with described main heat exchanger, the pipeline of described steam supplementary units is provided with to nourish and fills steam valve.
Desulfurization wastewater zero-discharge treatment system the most according to claim 1, it is characterised in that described crystal salt packaged unit includes cyclone, centrifugal dehydrator, drying fluidized-bed and the baling press being sequentially connected with；Described concentrated solution reflux unit includes concentrated solution container and the concentrated solution reflux pump being connected with described cyclone.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106517624A (en) * | 2016-11-02 | 2017-03-22 | 盛发环保科技（厦门）有限公司 | Multistage fluidized bed crystallization based desulfuration wastewater treatment method and system |
| WO2018214350A1 (en) * | 2017-05-25 | 2018-11-29 | 北京国电龙源环保工程有限公司 | Wet desulfurization wastewater resource processing system and processing method therefor |
| CN109399746A (en) * | 2018-12-21 | 2019-03-01 | 福建龙净环保股份有限公司 | A kind of desulfurization wastewater recycling treatment system |
| CN111003870A (en) * | 2019-12-27 | 2020-04-14 | 攀钢集团西昌钢钒有限公司 | Desulfurization wastewater treatment method and treatment device |
| CN111054279A (en) * | 2019-12-31 | 2020-04-24 | 广东雪迪龙环境科技有限公司 | Catalytic oxidation process device and method for magnesium sulfite |
-
2016
- 2016-03-24 CN CN201620232812.3U patent/CN205528225U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106517624A (en) * | 2016-11-02 | 2017-03-22 | 盛发环保科技（厦门）有限公司 | Multistage fluidized bed crystallization based desulfuration wastewater treatment method and system |
| CN106517624B (en) * | 2016-11-02 | 2023-06-06 | 盛发环保科技（厦门）有限公司 | Desulfurization wastewater treatment method and system based on multistage fluidized bed crystallization |
| WO2018214350A1 (en) * | 2017-05-25 | 2018-11-29 | 北京国电龙源环保工程有限公司 | Wet desulfurization wastewater resource processing system and processing method therefor |
| CN107082523B (en) * | 2017-05-25 | 2023-08-08 | 国能龙源环保有限公司 | Wet desulfurization wastewater recycling treatment system and treatment method thereof |
| CN109399746A (en) * | 2018-12-21 | 2019-03-01 | 福建龙净环保股份有限公司 | A kind of desulfurization wastewater recycling treatment system |
| CN111003870A (en) * | 2019-12-27 | 2020-04-14 | 攀钢集团西昌钢钒有限公司 | Desulfurization wastewater treatment method and treatment device |
| CN111054279A (en) * | 2019-12-31 | 2020-04-24 | 广东雪迪龙环境科技有限公司 | Catalytic oxidation process device and method for magnesium sulfite |
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