CN109987769A - Power plant desulfurization wastewater negative pressure low-temperature evaporation concentration systems and technique - Google Patents
Power plant desulfurization wastewater negative pressure low-temperature evaporation concentration systems and technique Download PDFInfo
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- CN109987769A CN109987769A CN201910373153.3A CN201910373153A CN109987769A CN 109987769 A CN109987769 A CN 109987769A CN 201910373153 A CN201910373153 A CN 201910373153A CN 109987769 A CN109987769 A CN 109987769A
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- 238000001704 evaporation Methods 0.000 title claims abstract description 147
- 239000002351 wastewater Substances 0.000 title claims abstract description 111
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 101
- 230000023556 desulfurization Effects 0.000 title claims abstract description 101
- 230000008020 evaporation Effects 0.000 title claims abstract description 83
- 238000000034 method Methods 0.000 title claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 151
- 230000000694 effects Effects 0.000 claims abstract description 133
- 239000012141 concentrate Substances 0.000 claims abstract description 32
- 239000007788 liquid Substances 0.000 claims abstract description 22
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000010865 sewage Substances 0.000 claims abstract description 11
- 239000000706 filtrate Substances 0.000 claims abstract description 10
- 239000006228 supernatant Substances 0.000 claims abstract description 10
- 239000013049 sediment Substances 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims abstract description 4
- 239000010802 sludge Substances 0.000 claims abstract description 4
- 238000010438 heat treatment Methods 0.000 claims description 60
- 239000007787 solid Substances 0.000 claims description 29
- 239000012535 impurity Substances 0.000 claims description 28
- 230000008569 process Effects 0.000 claims description 16
- 238000012545 processing Methods 0.000 claims description 15
- 238000001914 filtration Methods 0.000 claims description 13
- 238000000926 separation method Methods 0.000 claims description 11
- 238000005516 engineering process Methods 0.000 claims description 9
- 238000009833 condensation Methods 0.000 claims description 6
- 230000005494 condensation Effects 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 3
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 3
- 239000004571 lime Substances 0.000 claims description 3
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 10
- 230000001376 precipitating effect Effects 0.000 description 7
- 238000001802 infusion Methods 0.000 description 6
- 239000000725 suspension Substances 0.000 description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 239000005864 Sulphur Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 238000011001 backwashing Methods 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005352 clarification Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000007701 flash-distillation Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910001425 magnesium ion Inorganic materials 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- 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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- 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
-
- 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
- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
-
- 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
- C02F2001/007—Processes including a sedimentation step
-
- 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
- C02F2103/16—Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Abstract
This application discloses a kind of power plant desulfurization wastewater negative pressure low-temperature evaporation concentration systems and techniques.The power plant desulfurization wastewater negative pressure low-temperature evaporation concentration systems include negative pressure low-temperature evaporation concentration device, cyclone separator, scraper-type filter, clarifier, plate and frame filter press and concentrated water case, first waterwater entrance of negative pressure low-temperature evaporation concentration device is passed through desulfurization wastewater, the concentrate outlet of negative pressure low-temperature evaporation concentration device and the water inlet of cyclone separator connect, the overflow port of cyclone separator is connect with the water inlet of scraper-type filter, the filtrate (liquid of scraper-type filter is connect with the second waterwater entrance of negative pressure low-temperature evaporation concentration device, the sediment ejection opening of cyclone separator and the sewage draining exit of scraper-type filter are connect with the water inlet of clarifier, the supernatant outlet of clarifier is connect with the water inlet of concentrated water case, the sludge outlet of clarifier and the material inlet of plate and frame filter press connect.Present application addresses desulfurization wastewaters to be concentrated, filter effect is bad, system run all right difference technical problem.
Description
Technical field
This application involves heat-engine plant desulfurized field of waste water treatment, low in particular to a kind of power plant desulfurization wastewater negative pressure
Warm evaporation concentration system and technique.
Background technique
Aggravation with shortage of water resources and the environmental pollution that gets worse, wastewater treatment are occupied more in thermal power plant
Come more important position.The Sewage treatment of thermal power plant has water-saving and environmentally friendly double benefit, by the recycling of waste water, realizes waste water
Recycling has become the only way that thermal power plant realizes sustainable development.In addition, from economical operation and protection water environment isogonism
Degree sets out, and saves power generation water consume, improves the recycling rate of waterused of water, realizes thermal power plant's water-saving and emission-reducing, finally realize wastewater zero discharge
It is significant.
Tail end wastewater of the desulfurization wastewater as power plant, with complicated component, suspension content is high, hardness is big, chloride ion
The features such as content is high, water quality is weakly acidic, processing difficulty is big, and realizes the difficult point of wastewater zero discharge at present.
At this stage, common desulfurization wastewater processing technique mainly has film concentration technique and thermal concentration technology, in which:
Film concentration is that the concentrated water for generating UF membrane is evaporated crystallization again, and evaporation process load and section can be effectively reduced
About processing cost, but film process requires height to influent quality, it is necessary to softening pretreatment is carried out to waste water, pretreatment needs to consume
A large amount of medicament, and control complexity is run, film is easy contaminated, operating cost valuableness.
Thermal concentration technology includes multiple-effect evaporation technology (MED) and steam mechanical recompression (MVR), in which:
Multiple-effect evaporation technology is made of multiple evaporators being serially connected, and the steam that the first effect generates is as the second effect evaporation
The heat medium of device, is utilized again.But due to chloride ion, sulfate ion, calcium ions and magnesium ions, heavy metal in desulfurization wastewater
The high feature of ion concentration, the easy fouling of technology heating part heat exchanger inner wall, scale forming matter cannot clear out system in time, cause
Scale forming matter recycles in system, and dirt accumulation causes heat exchange blockage, and heat exchange area greatly reduces, and influences heat exchange efficiency.
Steam mechanical recompression is temperature, pressure rise by secondary steam after compressor adiabatic compression, is sent into and steams
Device is sent out as heating steam, though the latent heat of secondary steam is used, reduces steam consumption, acting process consumption is big
The electric energy of amount, power plant's application are limited.
Therefore, desulfurization wastewater technique of zero discharge at this stage is badly in need of solving heating equipment scaling, causes system that cannot stablize
The problem of operation.
For the concentration of desulfurization wastewater in the related technology, filter effect is bad, problem of system run all right difference, at present still
It does not put forward effective solutions.
Summary of the invention
The main purpose of the application is to provide a kind of power plant desulfurization wastewater negative pressure low-temperature evaporation concentration systems and technique, with
Solve the problems, such as that desulfurization wastewater concentration, filter effect is bad, system run all right is poor.
To achieve the goals above, according to the one aspect of the application, a kind of power plant desulfurization wastewater negative pressure low temperature is provided
Evaporation concentration system.
According to the power plant desulfurization wastewater negative pressure low-temperature evaporation concentration systems of the application, comprising: be evaporated to desulfurization wastewater
The negative pressure low-temperature evaporation concentration device of processing is separated by solid-liquid separation the concentrate of negative pressure low-temperature evaporation concentration device discharge
Cyclone separator, the separating obtained concentrate of the cyclone separator is filtered scraper-type filter, to the eddy flow
Clarifier that separator and the separating obtained solid impurity of the scraper-type filter and a small amount of concentrate are separated by solid-liquid separation, to institute
It states the separating obtained solid impurity of clarifier and carries out the plate and frame filter press for being pressed into cake and to separating obtained upper of the clarifier
The concentrated water case that layer clear liquid is collected, the first waterwater entrance of the negative pressure low-temperature evaporation concentration device are passed through desulfurization wastewater, institute
The concentrate outlet for stating negative pressure low-temperature evaporation concentration device is connect with the water inlet of the cyclone separator, the cyclonic separation
The overflow port of device is connect with the water inlet of the scraper-type filter, the filtrate (liquid of the scraper-type filter and the negative pressure
The second waterwater entrance connection of low-temperature evaporation concentration device, the sediment ejection opening of the cyclone separator and the scraper-type filter
Sewage draining exit is connect with the water inlet of the clarifier, the water inlet of the supernatant outlet of the clarifier and the concentrated water case
Connection, the sludge outlet of the clarifier are connect with the material inlet of the plate and frame filter press.
Further, the negative pressure low-temperature evaporation concentration device include desulfurization wastewater baffle-box, one effect heating and evaporating unit,
Two effect heating and evaporating units, condenser and filtered water tank, the effect heating and evaporating unit connect external heat source, the two effects heating
The water inlet of vaporising device is connect with the water outlet of the desulfurization wastewater baffle-box, the water outlet of the two effects heating and evaporating unit
It is connect with the water inlet of the effect heating and evaporating unit, the steam (vapor) outlet of the effect heating and evaporating unit and two effect add
The steam inlet of heat evaporating device connects, and the heat source lime set of the effect heating and evaporating unit is directly externally discharged, two effect
The steam (vapor) outlet of heating and evaporating unit is connect with the steam inlet of the condenser, the water outlet of the condenser and two effect
The water outlet of heating and evaporating unit is connect with the water inlet of the filtered water tank.
Further, the two effects heating and evaporating unit includes two effect heaters, 2nd effect evaporator and second circulation pump, institute
2nd effect evaporator access vacuum system is stated, the water outlet of the two effects heater is connect with the water inlet of the 2nd effect evaporator,
The steam (vapor) outlet of the 2nd effect evaporator is the steam (vapor) outlet of the two effects heating and evaporating unit, the steam of the two effects heater
Import is the steam inlet of the two effects heating and evaporating unit, and the water inlet of the 2nd effect evaporator is the negative pressure low-temperature evaporation
First waterwater entrance of enrichment facility, the water outlet of the 2nd effect evaporator is pumped by the second circulation imitates with described two respectively
The water inlet of heater is connected with the water inlet of the effect heating and evaporating unit.
Further, the effect heating and evaporating unit includes an effect heater, 1st effective evaporator and first circulation pump, institute
1st effective evaporator access vacuum system is stated, the water outlet of the effect heater is connect with the water inlet of the 1st effective evaporator,
The steam (vapor) outlet of the 1st effective evaporator is the steam (vapor) outlet of the effect heating and evaporating unit, and the effect heater directly connects
Enter external heat source, the water outlet of the 1st effective evaporator is connected by first circulation pump and the water inlet of the effect heater
It connects, the water inlet of the 1st effective evaporator is the second waterwater entrance of the negative pressure low-temperature evaporation concentration device, and an effect is steamed
The discharge outlet for sending out device is the concentrate outlet of the negative pressure low-temperature evaporation concentration device.
Further, it is provided on the outlet conduit of the 1st effective evaporator to concentrated solution density in the 1st effective evaporator
The densimeter detected.
Further, backwash water inlet and backwash water return outlet, the recoil are provided on the scraper-type filter
It washes water inlet to connect with the water outlet of the desulfurization wastewater baffle-box, the backwash water return outlet and the desulfurization wastewater baffle-box
Water inlet connection, filtrate water return outlet is provided on the plate and frame filter press, the filtrate water return outlet and the desulfurization wastewater are slow
Rush the water inlet connection of case.
Further, the cyclone separator includes upper shell and lower shell, the top of the lower shell and the upper cylinder
The bottom of body connects, and the lower shell is inverted pyramidal structure, is provided with overflow port, the upper cylinder at the top of the upper shell
The side wall upper part of body is provided with water inlet, and the bottom of the lower shell is provided with sewage draining exit.
Further, the scraper-type filter includes outer housing, filter screen, scraper and driving motor, the filter screen
To be columnar structured, the inside of the outer housing is arranged in the filter screen, and the outer housing is arranged in the driving motor
The output shaft at top, the driving motor is connect with scraper, and the scraper is located at the inside of the outer housing, the scraper it is outer
The inner wall of edge and the filter screen fits, and is provided with water inlet on the side wall of the outer housing above the filter screen,
It is provided with water outlet on the lower sides of the outer housing, the bottom of the outer housing is provided with sewage draining exit.
Further, the scraper-type filter further includes detecting to the pressure difference of the inner side and outer side of the filter screen
Differential manometer, the differential manometer is mounted on the outer housing.
To achieve the goals above, according to further aspect of the application, it is low to provide a kind of power plant desulfurization wastewater negative pressure
Warm evaporating and concentrating process.
According to the desulfurization wastewater concentration technology of the application, include the following steps:
Step S1: desulfurization wastewater is stirred evenly；
Step S2: evaporation process for the first time is carried out to the desulfurization wastewater stirred evenly；
Step S3: double evaporation-cooling proces are carried out to the desulfurization wastewater after evaporating for the first time, wherein desulfurization wastewater is steamed for the first time
The temperature of hair processing carries out the temperature of double evaporation-cooling proces lower than desulfurization wastewater；
Step S4: the steam generated to evaporation carries out heat exchange condensation process, and is collected to condensed water, to double evaporation-cooling
Resulting concentrate is handled to be filtered；
Step S6: resulting concentrate, which is back in step S2, after filtering is evaporated processing, and obtained solid is miscellaneous after filtering
Matter is stood, so as to be separated by solid-liquid separation；
Step S7: it stands gained supernatant liquor and is recycled as concentrate, stand obtained solid impurity to outlet
Out, and after being dehydrated mud cake is made.
In the embodiment of the present application, the desulfurization wastewater through sulphur waste water baffle-box after mixing evenly, initially enters evaporating temperature
Lower 2nd effect evaporator and two effect heaters in be evaporated processing, later enter the lower 1st effective evaporator of evaporating temperature with
Further evaporation process is carried out in one effect heater, the steam for evaporating generation enters in filtered water tank after heat exchange condensation, and one
The concentrate in evaporator is imitated after cyclone separator and the filtering of scraper-type filter, 1st effective evaporator is back to and is steamed again
Hair, the solid impurities such as cyclone separator and the filtered silt of scraper-type filter bottom drain into clarifier and are precipitated, and precipitate
Supernatant liquor afterwards drains into concentrated water case, and wait be further processed, the bottom sediment after precipitating drains into plate and frame filter press, through dewatered
Mud cake outward transport processing, to realize the concentration decrement of desulfurization wastewater, whole system is compact-sized, and stability and high efficiency has reached desulfurization
The concentration of waste water is reduced, and guarantees desulfurization wastewater temperature at 82 DEG C hereinafter, the generation of reduction calcium sulfate hard scale, passes through cyclone separator
Filtering gained bulky grain solid impurity is removed in time with scraper-type filter, reduces the supersaturation of scale forming matter in device
Degree and concentration of suspension, it is ensured that the operation steady in a long-term of desulfurization wastewater evaporation concentration device, and then it is dense to solve desulfurization wastewater
It contracts, filter effect is bad, system run all right difference technical problem.
Detailed description of the invention
The attached drawing constituted part of this application is used to provide further understanding of the present application, so that the application's is other
Feature, objects and advantages become more apparent upon.The illustrative examples attached drawing and its explanation of the application is for explaining the application, not
Constitute the improper restriction to the application.In the accompanying drawings:
Fig. 1 is the structural schematic diagram of power plant desulfurization wastewater negative pressure low-temperature evaporation concentration systems of the present invention；
Fig. 2 is the structural schematic diagram of cyclone separator in power plant desulfurization wastewater negative pressure low-temperature evaporation concentration systems of the present invention；
Fig. 3 is the structural schematic diagram that panel filter is scraped in power plant desulfurization wastewater negative pressure low-temperature evaporation concentration systems of the present invention.
Specific embodiment
In order to make those skilled in the art more fully understand application scheme, below in conjunction in the embodiment of the present application
Attached drawing, the technical scheme in the embodiment of the application is clearly and completely described, it is clear that described embodiment is only
The embodiment of the application a part, instead of all the embodiments.Based on the embodiment in the application, ordinary skill people
Member's every other embodiment obtained without making creative work, all should belong to the model of the application protection
It encloses.
It should be noted that the description and claims of this application and term " first " in above-mentioned attached drawing, "
Two " etc. be to be used to distinguish similar objects, without being used to describe a particular order or precedence order.It should be understood that using in this way
Data be interchangeable under appropriate circumstances, so as to embodiments herein described herein.In addition, term " includes " and " tool
Have " and their any deformation, it is intended that cover it is non-exclusive include, for example, containing a series of steps or units
Process, method, system, product or equipment those of are not necessarily limited to be clearly listed step or unit, but may include without clear
Other step or units listing to Chu or intrinsic for these process, methods, product or equipment.
In this application, term " on ", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outside",
" in ", "vertical", "horizontal", " transverse direction ", the orientation or positional relationship of the instructions such as " longitudinal direction " be orientation based on the figure or
Positional relationship.These terms are not intended to limit indicated dress primarily to better describe the present invention and embodiment
Set, element or component must have particular orientation, or constructed and operated with particular orientation.
Also, above-mentioned part term is other than it can be used to indicate that orientation or positional relationship, it is also possible to for indicating it
His meaning, such as term " on " also are likely used for indicating certain relations of dependence or connection relationship in some cases.For ability
For the those of ordinary skill of domain, the concrete meaning of these terms in the present invention can be understood as the case may be.
In addition, term " installation ", " setting ", " being equipped with ", " connection ", " connected ", " socket " shall be understood in a broad sense.For example,
It may be a fixed connection, be detachably connected or monolithic construction；It can be mechanical connection, or electrical connection；It can be direct phase
It even, or indirectly connected through an intermediary, or is two connections internal between device, element or component.
For those of ordinary skills, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.The application is described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
As shown in Figure 1, the power plant desulfurization is useless this application involves a kind of power plant desulfurization wastewater negative pressure low-temperature evaporation concentration systems
Water negative pressure low-temperature evaporation concentration systems include negative pressure low-temperature evaporation concentration device, cyclone separator 8, scraper-type filter 9, clarification
Device 10, plate and frame filter press 12 and concentrated water case 11, negative pressure low-temperature evaporation concentration device are revolved for being evaporated processing to desulfurization wastewater
The concentrate that stream separator 8 is used to that negative pressure low-temperature evaporation concentration device to be discharged carries out solid-liquid separation treatment, scraper-type filter 9
Scraper-type filter 9 for being filtered to the separating obtained concentrate of cyclone separator 8, clarifier 10 are used for cyclonic separation
Device 8 and the separating obtained solid impurity of scraper-type filter 9 and a small amount of concentrate carry out solid-liquid separation treatment, and plate and frame filter press 12 is used
In be pressed into cake to the separating obtained solid impurity of clarifier 10, concentrated water case 11 is for separating obtained to clarifier 10
Layer clear liquid is collected.Desulfurization wastewater, negative pressure low-temperature evaporation are passed through to the first waterwater entrance of negative pressure low-temperature evaporation concentration device
The concentrate outlet of enrichment facility is connect by infusion pipeline with the water inlet of cyclone separator 8, the overflow of cyclone separator 8
Mouth is connect by infusion pipeline with the water inlet of scraper-type filter 9, and the filtrate (liquid of scraper-type filter 9 passes through infusion pipeline
It is connect with the second waterwater entrance of negative pressure low-temperature evaporation concentration device, the sediment ejection opening of cyclone separator 8 and scraper-type filter 9
Sewage draining exit is connect with the water inlet of clarifier 10, and the supernatant outlet of clarifier 10 passes through infusion pipeline and concentrated water case 11
Water inlet connection, the sludge outlet of clarifier 10 are connect with the material inlet of plate and frame filter press 12.The present invention is low by negative pressure
After warm evaporation concentration device is stirred uniformly desulfurization wastewater, twice evaporation processing is carried out, the concentrate after evaporation is through eddy flow
After separator 8 and scraper-type filter 9 filter, it is back in negative pressure low-temperature evaporation concentration device and is evaporated again, eddy flow point
It drains into clarifier 10 from the solid impurities such as device 8 and the filtered silt of scraper-type filter 9 to be precipitated, the upper layer after precipitating is clear
Liquid drains into concentrated water case 11, and wait be further processed, the silt after precipitating drains into plate and frame filter press 12, at dewatered mud cake outward transport
Reason realizes the concentration decrement of desulfurization wastewater, and whole system is compact-sized, stability and high efficiency, and the concentration for having reached desulfurization wastewater subtracts
Bulky grain solid impurity obtained by filtering is removed in time as cyclone separator 8 and scraper-type filter 9, reduces dress by amount
Set the degree of supersaturation and concentration of suspension of interior scale forming matter, it is ensured that the operation steady in a long-term of desulfurization wastewater evaporation concentration device
As shown in Figure 1, negative pressure low-temperature evaporation concentration device includes that desulfurization wastewater baffle-box 1, one imitates heating and evaporating unit
504, two effect heating and evaporating units 302, condenser 6 and filtered water tank 7, an effect heating and evaporating unit 504 connect external heat source, two effects
The water inlet of heating and evaporating unit 302 is connect by hydraulic pipeline with the water outlet of desulfurization wastewater baffle-box 1, two effect heating evaporations
The water outlet of device 302 is connect by hydraulic pipeline with the water inlet of an effect heating and evaporating unit 504, an effect heating and evaporating unit
504 steam (vapor) outlet is connect by air delivering pipeline with the steam inlet of two effect heating and evaporating units 302, an effect heating and evaporating unit
504 heat source lime set returns to heat source system, and the steam (vapor) outlet of two effect heating and evaporating units 302 passes through air delivering pipeline and condenser 6
Steam inlet connection, the water outlet of condenser 6 and two effect heating and evaporating units 302 water outlet pass through different hydraulic pipelines
It is connect with the water inlet of filtered water tank 7.By an effect heating and evaporating unit 504 and two effect heating and evaporating units 302 to desulfurization wastewater
It carries out heating evaporation twice to handle, improves the evaporation effect to desulfurization wastewater.
In some embodiments of the present invention, 1 bottom of desulfurization wastewater baffle-box, which is provided with, to be stirred what desulfurization wastewater was stirred
Mix device.
In some embodiments of the present invention, the temperature in two effect heating and evaporating units 302 is lower than an effect heating and evaporating unit
Temperature in 504.
Further, as shown in Figure 1, two effect heating and evaporating units 302 include two effect heaters 3,2nd effect evaporator 2 and the
Two circulating pumps, 2nd effect evaporator 2 access vacuum system, and the water outlet of two effect heaters 3 passes through infusion pipeline and 2nd effect evaporator 2
Water inlet connection, the steam (vapor) outlet of 2nd effect evaporator 2 is the steam (vapor) outlets of two effect heating and evaporating units 302, two effect heaters 3
Steam inlet be two effect heating and evaporating units 302 steam inlets, the water inlet of 2nd effect evaporator 2, which is negative, presses low-temperature evaporation dense
The water outlet of first waterwater entrance of compression apparatus, 2nd effect evaporator 2 is pumped by second circulation and hydraulic pipeline adds with two effects respectively
The water inlet connection of the water inlet of hot device 3 and an effect heating and evaporating unit 504.
Further, as shown in Figure 1, an effect heating and evaporating unit 504 includes an effect heater 5,1st effective evaporator 4 and the
One circulating pump, 1st effective evaporator 4 access vacuum system, and the water outlet of an effect heater 5 passes through infusion pipeline and 1st effective evaporator 4
Water inlet connection, the steam (vapor) outlet of 1st effective evaporator 3 is the steam (vapor) outlet of an effect heating and evaporating unit 302, an effect heater 5
Be directly accessed external heat source, the water outlet of 1st effective evaporator 4 by first circulation pump and hydraulic pipeline and one imitate heater 5 into
Mouth of a river connection, the water inlet of 1st effective evaporator 4, which is negative, presses the second waterwater entrance of low-temperature evaporation concentration device, 1st effective evaporator 4
Discharge outlet be negative and press the concentrate outlet of low-temperature evaporation concentration device.
In some embodiments of the present invention, one effect heater 5 and two effect heaters 3 heating temperature be 82 DEG C hereinafter,
By mechanism and the characteristic of existing calcium sulfate scaling it is found that temperature is at 82 DEG C or less can reduce the generation of calcium sulfate hard scale.
In some embodiments of the present invention, it is provided on the outlet conduit of 1st effective evaporator 4 and is concentrated in 1st effective evaporator 4
The densimeter that liquid density is detected is carried out in real time by densimeter to resulting concentrated solution density is evaporated in 1st effective evaporator 4
Detection, so that concentrate externally can be discharged in time after reaching preset threshold.
As shown in Figure 1, backwash water inlet and backwash water return outlet are provided on scraper-type filter 9, backwash water inlet
Mouth is connect by hydraulic pipeline with the water outlet of desulfurization wastewater baffle-box 1, and backwash water return outlet is given up by hydraulic pipeline and desulfurization
The water inlet of water baffle-box 1 connects, and is provided with filtrate water return outlet on plate and frame filter press 12, filtrate water return outlet by hydraulic pipeline with
The water inlet of desulfurization wastewater baffle-box 1 connects, and is scraped the desulfurization wastewater introducing of desulfurization wastewater baffle-box 1 by backwash water inlet
In leaf filter 9, the solid impurity accumulated in scraper-type filter 9 is cleaned, the liquid after cleaning passes through recoil
It washes water return outlet and is back to desulfurization wastewater baffle-box 1 and be evaporated and filtration treatment, thus guarantee the cleaning of scraper-type filter 9,
Extend the service life of scraper-type filter 9.
As shown in Figure 1 and Figure 2, cyclone separator 8 includes upper shell 801 and lower shell 802, and upper shell 801 is cylinder-shaped knot
Structure, lower shell 802 are inverted conical structure, and the top of lower shell 802 is connect with the bottom of upper shell 801, upper shell 801
Top be provided with overflow port, the side wall upper part of upper shell 801 is provided with water inlet, and the bottom of lower shell 802 is provided with blowdown
Mouthful.The tangential concentrate into cyclone separator 8 is moved downward along 8 spiral inner wall of cyclone separator, wherein bulky grain solid
Impurity is larger by centrifugal force, and solid small particles impurity and most of concentrate are small by centrifugal force, under the promotion of subsequent water inlet, Gu
The partial size of body impurity is increasing by center inward wall direction, forms hierarchal arrangement, with into the liquid in condensed water from upper cylinder
Body 801 flows to lower shell 802, and flow section is smaller and smaller, contains solid small particles impurity under the compressing of outer layer concentrate
Internal layer concentrate moves upwards, and is discharged from overflow port, and bulky grain solid impurity is discharged by sediment ejection opening, reaches the mesh of separation of solid and liquid
's.
As shown in Figure 1, Figure 3, scraper-type filter 9 includes outer housing 901, filter screen 904, scraper, 902 and of driving motor
Differential manometer 903, filter screen 904 be it is columnar structured, the inside of outer housing 901 is arranged in filter screen 904, and driving motor 902 is set
It sets at the top of outer housing 9, the output shaft of driving motor 902 stretches to the inside of outer housing 901, driving motor along the vertical direction
Scraper is connected on 902 output shaft, scraper is located at the inside of filter screen 904, the outer rim and the inner wall phase of filter screen 904 of scraper
Fitting, differential manometer 903 are mounted on outer housing 901, are provided on the side wall of the outer housing 901 above filter screen 904 into water
Mouthful, it is provided with water outlet on the lower sides of outer housing 901, the bottom of outer housing 901 is provided with sewage draining exit.Pass through pressure difference
The pressure difference for counting 903 real-time monitoring filter screen, 904 inner and outer starts driving motor when pressure difference reaches preset threshold
902, to drive scraper to rotate and strike off to the solid impurity retained on 904 inner wall of filter screen, while opening sewage draining exit
The blowdown valve at place will sweep the solid impurity to get off and externally be discharged.
This application involves a kind of power plant desulfurization wastewater negative pressure low-temperature evaporation concentration technology, the power plant desulfurization wastewater negative pressure low temperature
Evaporating and concentrating process includes the following steps:
Step S1: desulfurization wastewater is stirred evenly by sulphur waste water baffle-box 1；
Step S2: desulfurization wastewater passes sequentially through 2nd effect evaporator 2 and two effect heaters 3 carry out evaporation process for the first time；
Step S3: the desulfurization wastewater after evaporation sequentially enters 1st effective evaporator 4 and an effect heater 5 is further steamed
Hair processing, wherein the temperature in 2nd effect evaporator 2 and two effect heaters 3 is lower than in 1st effective evaporator 4 and an effect heater 5
Temperature；
Its step S2 and step S3 steams specifically, introducing desulfurization wastewater in 2nd effect evaporator 2 through waste water feed pump
Hair is handled, and effluent part, which enters, in cyclic process carries out further evaporation process in 1st effective evaporator 4, external heat source can draw electricity
The low-pressure saturated steam of factory, thus to one effect heater 5 in desulfurization wastewater preheat after be recycled in 1st effective evaporator 4 into
Row flash distillation, the steam that 1st effective evaporator 4 is discharged can be used as heat source and enters in two effect heaters 3, and two effect heaters 3 give up desulfurization
It is recycled in 2nd effect evaporator 2 and is flashed after water heating.Wherein, the is provided between 2nd effect evaporator 2 and two effect heaters 3
Two circulating pumps are provided with inlet valve between second circulation pump and 1st effective evaporator 4, when waste water liquid level is low in 1st effective evaporator 4
When preset threshold, inlet valve is opened, partial desulfurization waste water is pumped into 1st effective evaporator 4 by 2nd effect evaporator 2, similarly,
When waste water liquid level is lower than preset threshold in 2nd effect evaporator 2, waste water feed pump is opened, desulfurization wastewater is by desulfurization wastewater baffle-box
1 is pumped into 2nd effect evaporator 2.
Step S4: the steam for evaporating generation enters in filtered water tank 7 after the heat exchange condensation of condenser 6, in 1st effective evaporator 4
Concentrate enter in cyclone separator 8 and scraper-type filter 9；
Specifically, entering filtered water tank 7 after the steam condensation that 1st effective evaporator 4 is discharged, the steam that 2nd effect evaporator 2 is discharged is cold
Enter filtered water tank 7 after solidifying.Wherein, the overflow port water outlet of cyclone separator 8 enters in scraper-type filter 9, scraper-type filter 9
500 microns of fine particle shape solid impurities below are gone by the filter screen 904 that aperture is 300~500 micron pore sizes
It removes, realizes the depth-type filtration of solid-liquid, water outlet is back in 1st effective evaporator 4 after filtering carries out circulating and evaporating again.
Step S6: resulting concentrate is filtered through cyclone separator 8 and scraper-type filter 9 and is back to 1st effective evaporator 4
Interior to be evaporated again, obtained solid impurity, which drains into clarifier 10, after cyclone separator 8 and the filtering of scraper-type filter 9 carries out
Precipitating；
Specifically, the backwashing water of scraper-type filter 9 is controlled by valve and water pump, when the pressure of scraper-type filter 9
When difference meter reaches preset threshold, driving motor 902 is opened, driving motor 902 drives scraper rotation, scrapes to filter screen 904
It sweeps, the solid impurity scraped off is expelled to clarifier 10, if sweep rear differential manometer still and cannot restore to normal value, opens recoil
Wash water valve and water pump, by desulfurization wastewater in desulfurization wastewater baffle-box 1 be introduced in scraper-type filter 9 to filter screen 904 into
Row rinses, and return water is back in desulfurization wastewater baffle-box 1 and is handled again after flushing, realizes the recoil of scraper-type filter 9
It washes.
Step S7: the precipitating gained supernatant liquor of clarifier 10 drains into concentrated water case, and clarifier 10 precipitates obtained solid impurity row
To plate and frame filter press, mud cake outward transport processing is made after being dehydrated.
It can be seen from the above description that the present invention realizes following technical effect:
Desulfurization wastewater through sulphur waste water baffle-box 1 after mixing evenly initially enters the lower 2nd effect evaporator 2 of evaporating temperature
It is evaporated processing in two effect heaters 3, is entered in the lower 1st effective evaporator 4 of evaporating temperature and an effect heater 5 later
Further evaporation process is carried out, the steam for evaporating generation enters in filtered water tank 7 after the heat exchange of condenser 6 condensation, an effect
Concentrate in evaporator 4 is back to 1st effective evaporator 4 and carries out again after cyclone separator 8 and scraper-type filter 9 filter
Evaporation, the solid impurities such as filtered silt of cyclone separator 8 and 9 bottom of scraper-type filter drain into clarifier 10 and are sunk
It forms sediment, the supernatant liquor after precipitating drains into concentrated water case 11, and wait be further processed, the bottom sediment after precipitating drains into plate and frame filter press
12, it is handled through dewatered mud cake outward transport, to realize the concentration decrement of desulfurization wastewater, whole system is compact-sized, stablizes high
Effect, has reached the concentration decrement of desulfurization wastewater, and an effect heater 5 and two effect heaters 3 control the temperature of desulfurization wastewater at 82 DEG C
Hereinafter, effectively reducing the generation of calcium sulfate hard scale, improves working efficiency, extends service life of equipment.In addition, passing through cyclonic separation
Filtering gained bulky grain solid impurity is removed by device 8 and scraper-type filter 9 in time, reduces the mistake of scale forming matter in device
Saturation degree and concentration of suspension, it is ensured that the operation steady in a long-term of desulfurization wastewater evaporation concentration device.
In addition, the present invention is based on the generations that crystal of calcium sulfate mechanism and negative pressure evaporation principle effectively prevent hard scale, to desulfurization
In conjunction with the filtering to condensed water while waste water progress low-temperature evaporation, the removal of bulky grain solid impurity in system is realized, greatly
The degree of supersaturation and concentration of suspension of scale forming matter in big reduction system, it is ensured that the efficient stable of evaporation concentration system is transported
Row.
The foregoing is merely preferred embodiment of the present application, are not intended to limit this application, for the skill of this field
For art personnel, various changes and changes are possible in this application.Within the spirit and principles of this application, made any to repair
Change, equivalent replacement, improvement etc., should be included within the scope of protection of this application.
Claims (10)
1. a kind of power plant desulfurization wastewater negative pressure low-temperature evaporation concentration systems characterized by comprising be evaporated to desulfurization wastewater
The negative pressure low-temperature evaporation concentration device of processing is separated by solid-liquid separation the concentrate of negative pressure low-temperature evaporation concentration device discharge
Cyclone separator (8), scraper-type filter (9), right that the cyclone separator (8) separating obtained concentrate is filtered
The cyclone separator (8) and the separating obtained solid impurity of the scraper-type filter (9) and a small amount of concentrate carry out solid-liquid point
From clarifier (10), the solid impurity separating obtained to the clarifier (10) carry out the plate and frame filter press (12) for being pressed into cake
The concentrated water case (11) being collected with the supernatant liquor separating obtained to the clarifier (10), the negative pressure low-temperature evaporation concentration
First waterwater entrance of device is passed through desulfurization wastewater, the concentrate outlet of the negative pressure low-temperature evaporation concentration device and the rotation
The water inlet of stream separator (8) connects, the water inlet of the overflow port of the cyclone separator (8) and the scraper-type filter (9)
Mouth connection, the filtrate (liquid of the scraper-type filter (9) and the second waterwater entrance of the negative pressure low-temperature evaporation concentration device
The sewage draining exit of connection, the sediment ejection opening of the cyclone separator (8) and the scraper-type filter (9) with the clarifier (10)
Water inlet connection, the supernatant outlet of the clarifier (10) is connect with the water inlet of the concentrated water case (11), described clear
The sludge outlet of clear device (10) is connect with the material inlet of the plate and frame filter press (12).
2. power plant desulfurization wastewater negative pressure low-temperature evaporation concentration systems according to claim 1, which is characterized in that the negative pressure
Low-temperature evaporation concentration device includes desulfurization wastewater baffle-box (1), effect heating and evaporating unit (504), two effect heating and evaporating units
(302), condenser (6) and filtered water tank (7), effect heating and evaporating unit (504) connect external heat source, the two effects heating
The water inlet of vaporising device (302) is connect with the water outlet of the desulfurization wastewater baffle-box (1), the two effects heating and evaporating unit
(302) water outlet is connect with the water inlet of effect heating and evaporating unit (504), the effect heating and evaporating unit
(504) steam (vapor) outlet is connect with the steam inlet of two effect heating and evaporating unit (302), the effect heating and evaporating unit
(504) heat source lime set is directly externally discharged, the steam (vapor) outlet and the condenser of two effect heating and evaporating unit (302)
(6) water outlet of steam inlet connection, the water outlet of the condenser (6) and two effect heating and evaporating unit (302) is equal
It is connect with the water inlet of the filtered water tank (7).
3. power plant desulfurization wastewater negative pressure low-temperature evaporation concentration systems according to claim 2, which is characterized in that two effect
Heating and evaporating unit (302) includes two effects heater (3), 2nd effect evaporator (2) and second circulation pump, the 2nd effect evaporator
(2) vacuum system is accessed, the water outlet of two effect heater (3) is connect with the water inlet of the 2nd effect evaporator (2), described
The steam (vapor) outlet of 2nd effect evaporator (2) is the steam (vapor) outlet of two effect heating and evaporating unit (302), the two effects heater
(3) steam inlet is the steam inlet of two effect heating and evaporating unit (302), the water inlet of the 2nd effect evaporator (2)
For the first waterwater entrance of the negative pressure low-temperature evaporation concentration device, the water outlet of the 2nd effect evaporator (2) passes through described the
Water inlet of two circulating pumps respectively with the water inlet of two effect heater (3) and effect heating and evaporating unit (504) connects
It connects.
4. power plant desulfurization wastewater negative pressure low-temperature evaporation concentration systems according to claim 2, which is characterized in that an effect
Heating and evaporating unit (504) includes effect heater (5), 1st effective evaporator (4) and first circulation pump, the 1st effective evaporator
(4) vacuum system is accessed, the water outlet of effect heater (5) is connect with the water inlet of the 1st effective evaporator (4), described
The steam (vapor) outlet of 1st effective evaporator (4) is the steam (vapor) outlet of effect heating and evaporating unit (302), the effect heater
(5) it is directly accessed external heat source, the water outlet of the 1st effective evaporator (4) is heated by first circulation pump and an effect
The water inlet of device (5) connects, and the water inlet of the 1st effective evaporator (4) gives up for the second of the negative pressure low-temperature evaporation concentration device
Water inlet, the discharge outlet of the 1st effective evaporator (4) are the concentrate outlet of the negative pressure low-temperature evaporation concentration device.
5. power plant desulfurization wastewater negative pressure low-temperature evaporation concentration systems according to claim 4, which is characterized in that an effect
The densimeter detected to the 1st effective evaporator (4) interior concentrated solution density is provided on the outlet conduit of evaporator (4).
6. power plant desulfurization wastewater negative pressure low-temperature evaporation concentration systems according to claim 2, which is characterized in that the scraper plate
Backwash water inlet and backwash water return outlet, the backwash water inlet and the desulfurization wastewater are provided on formula filter (9)
The water outlet of baffle-box (1) connects, and the backwash water return outlet is connect with the water inlet of the desulfurization wastewater baffle-box (1), institute
State and be provided with filtrate water return outlet on plate and frame filter press (12), the filtrate water return outlet and the desulfurization wastewater baffle-box (1) into
Mouth of a river connection.
7. power plant desulfurization wastewater negative pressure low-temperature evaporation concentration systems according to claim 1, which is characterized in that the eddy flow
Separator (8) includes upper shell (801) and lower shell (802), the top and the upper shell (801) of the lower shell (802)
Bottom connection, the lower shell (802) is inverted pyramidal structure, be provided with overflow port at the top of the upper shell (801),
The side wall upper part of the upper shell (801) is provided with water inlet, and the bottom of the lower shell (802) is provided with sewage draining exit.
8. power plant desulfurization wastewater negative pressure low-temperature evaporation concentration systems according to claim 1, which is characterized in that the scraper plate
Formula filter (9) includes outer housing (901), filter screen (904), scraper and driving motor (902), and the filter screen (904) is
Columnar structured, filter screen (904) setting exists in the inside of the outer housing (901), driving motor (902) setting
The output shaft at the top of the outer housing (9), the driving motor (902) is connect with scraper, and the scraper is located at the shell
The inside of body (901), the outer rim of the scraper and the inner wall of the filter screen (904) fit, on the filter screen (904)
It is provided with water inlet on the side wall of the outer housing (901) of side, is provided with out on the lower sides of the outer housing (901)
The mouth of a river is provided with sewage draining exit in the bottom of the outer housing (901).
9. power plant desulfurization wastewater negative pressure low-temperature evaporation concentration systems according to claim 8, which is characterized in that the scraper plate
Formula filter (9) further includes the differential manometer (903) detected to the pressure difference of the inner side and outer side of the filter screen (904), institute
Differential manometer (903) is stated to be mounted on the outer housing (901).
10. a kind of power plant desulfurization wastewater negative pressure low-temperature evaporation concentration technology, which comprises the steps of:
Step S1: desulfurization wastewater is stirred evenly；
Step S2: evaporation process for the first time is carried out to the desulfurization wastewater stirred evenly；
Step S3: double evaporation-cooling proces are carried out to the desulfurization wastewater after evaporating for the first time, wherein desulfurization wastewater carries out evaporated for the first time
The temperature of reason carries out the temperature of double evaporation-cooling proces lower than desulfurization wastewater；
Step S4: the steam generated to evaporation carries out heat exchange condensation process, and is collected to condensed water, to double evaporation-cooling proces
Resulting concentrate is filtered；
Step S6: resulting concentrate, which is back in step S2, after filtering is evaporated processing, after filtering obtained solid impurity into
Row is stood, so as to be separated by solid-liquid separation；
Step S7: standing gained supernatant liquor and be recycled as concentrate, stand obtained solid impurity and be externally discharged, and
Mud cake is made after being dehydrated.
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