CN104445477A - Evaporative-crystallization salt making equipment and wastewater treatment system for treating high-salt organic wastewater - Google Patents
Evaporative-crystallization salt making equipment and wastewater treatment system for treating high-salt organic wastewater Download PDFInfo
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- CN104445477A CN104445477A CN201410623405.0A CN201410623405A CN104445477A CN 104445477 A CN104445477 A CN 104445477A CN 201410623405 A CN201410623405 A CN 201410623405A CN 104445477 A CN104445477 A CN 104445477A
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- 150000003839 salts Chemical class 0.000 title claims abstract description 219
- 239000002351 wastewater Substances 0.000 title claims abstract description 106
- 238000002425 crystallisation Methods 0.000 title claims abstract description 43
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 133
- 238000005406 washing Methods 0.000 claims abstract description 69
- 238000010438 heat treatment Methods 0.000 claims abstract description 14
- 239000012452 mother liquor Substances 0.000 claims description 35
- 230000008025 crystallization Effects 0.000 claims description 33
- 238000000034 method Methods 0.000 claims description 22
- 230000008569 process Effects 0.000 claims description 20
- 239000010815 organic waste Substances 0.000 claims description 13
- 239000012530 fluid Substances 0.000 claims description 7
- 238000005507 spraying Methods 0.000 claims description 2
- 239000002245 particle Substances 0.000 abstract description 7
- 239000013078 crystal Substances 0.000 description 69
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 28
- 239000011734 sodium Substances 0.000 description 14
- 239000011780 sodium chloride Substances 0.000 description 14
- 238000001704 evaporation Methods 0.000 description 12
- 230000008020 evaporation Effects 0.000 description 12
- 238000007701 flash-distillation Methods 0.000 description 8
- 239000007788 liquid Substances 0.000 description 8
- 239000000203 mixture Substances 0.000 description 8
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 8
- 239000007921 spray Substances 0.000 description 7
- 239000007787 solid Substances 0.000 description 6
- 239000002910 solid waste Substances 0.000 description 6
- 239000012267 brine Substances 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 230000009471 action Effects 0.000 description 3
- 239000003245 coal Substances 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 238000001223 reverse osmosis Methods 0.000 description 3
- 159000000000 sodium salts Chemical class 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000002203 pretreatment Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002562 thickening agent Substances 0.000 description 2
- NWZSZGALRFJKBT-KNIFDHDWSA-N (2s)-2,6-diaminohexanoic acid;(2s)-2-hydroxybutanedioic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O.NCCCC[C@H](N)C(O)=O NWZSZGALRFJKBT-KNIFDHDWSA-N 0.000 description 1
- 241001529739 Prunella <angiosperm> Species 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- PFLUPZGCTVGDLV-UHFFFAOYSA-N acetone azine Chemical compound CC(C)=NN=C(C)C PFLUPZGCTVGDLV-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 238000004581 coalescence Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- IKDUDTNKRLTJSI-UHFFFAOYSA-N hydrazine monohydrate Substances O.NN IKDUDTNKRLTJSI-UHFFFAOYSA-N 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910017053 inorganic salt Inorganic materials 0.000 description 1
- 239000008258 liquid foam Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000010413 mother solution Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000000108 ultra-filtration Methods 0.000 description 1
- -1 under gravity Substances 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 239000006200 vaporizer Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/06—Flash evaporation
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D3/00—Halides of sodium, potassium or alkali metals in general
- C01D3/04—Chlorides
- C01D3/06—Preparation by working up brines; seawater or spent lyes
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D5/00—Sulfates or sulfites of sodium, potassium or alkali metals in general
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D7/00—Carbonates of sodium, potassium or alkali metals in general
- C01D7/38—Preparation in the form of granules, pieces or other shaped products
- C01D7/40—Influencing the crystallisation process
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Abstract
The invention provides a wastewater treatment system and evaporative-crystallization salt making equipment for treating high-salt organic wastewater. The evaporative-crystallization salt making equipment comprises a flash tank; the flash tank is provided with a first circulating water inlet and a circulating water outlet which is arranged below the first circulating water inlet; the circulating water outlet is connected with the first circulating water inlet by a circulating pipe; and the circulating pipe is provided with a heating device. The evaporative-crystallization salt making equipment further comprises a salt washing leg, and the salt washing leg is connected with and penetrates through the bottom of the flash tank and comprises an upper water inlet, a middle water inlet and a salt outlet, wherein the upper water inlet is arranged in the salt washing leg, the water inlet direction of the upper water inlet is downward, the middle water inlet is arranged below the upper water inlet and is designed to enable the wastewater in the salt washing leg to generate rotational flow, and the salt outlet is arranged below the middle water inlet. The wastewater treatment system and the evaporative-crystallization salt making equipment can be used for washing the crystalloid salt particles repeatedly under the condition that the crystalloid salt particles are mixed with the wastewater, are simple in structure, low in cost, high in wastewater treatment efficiency and can ensure that the obtained crystalloid salt particles have high purity.
Description
Technical field
The present invention relates to a kind of evaporation crystallization equipment for salt-containing organic wastewater process and Waste Water Treatment; More particularly, the present invention relates to a kind of evaporative crystallization salt making equipment for high salt organic waste water process and Waste Water Treatment.
Background technology
In various large scale industry is produced, as oil refining, Coal Chemical Industry, electric power, fine chemistry industry, printing and dyeing and pharmacy etc., a large amount of salt-containing organic wastewaters can be produced.Because China is the water resources country that there is a serious shortage in the supply, these waste water can be required reuse usually, but these waste water are after by reuse, can produce a small amount of high salt organic waste water, main containing the pollutent such as various inorganic salinity and organism in waste water.Owing to containing above-mentioned pollutent in these high-salt wastewaters, generally directly can not discharge, and need waste water to continue to concentrate, realize zero release or the near zero release of waste water.At present, the common technology flow process realizing wastewater zero discharge is as follows:
Trade effluent → pre-treatment and the dense moisture film concentration systems → evaporation → crystallization of biochemistry → ultrafiltration → reverse osmosis (RO) → RO.
In above technique, after reverse-osmosis treated and the process of membrane concentration system, in waste water, the massfraction of total salinity (TDS) brings up to 5%-8%, and wastewater flow rate greatly reduces.Very small amount of waste water then enters in vaporizer and evaporates further, makes Waste water concentrating reach more than 21% to the massfraction of wherein TDS.Finally, the haline water after evaporator evaporation is delivered in crystallizer and is evaporated, forms crystal salt, realizes the zero release of waste water.
Such as, Chinese patent 201310205628.0 discloses a kind of strong brine vaporised liquid Zero emission device and processing method, this device comprises strong brine pump, air preheater, evaporation unit, salt dredge pump and equipment for separating liquid from solid, wherein, strong brine pump is connected with evaporation unit by pipeline, evaporation unit is connected with salt dredge pump by pipeline, salt dredge pump is connected with equipment for separating liquid from solid by pipeline, be connected by pipeline between air preheater with evaporation unit, equipment for separating liquid from solid is connected with evaporation unit by pipeline.
Chinese patent 201320744380.0 discloses a kind of evaporation crystallization equipment processing high-salt wastewater, and it comprises: thickener; Evaporative crystallizer, evaporative crystallizer has crystallisation chamber, and evaporative crystallizer is provided with opening for feed; Feed-pipe, one end of feed-pipe is communicated with crystallisation chamber, and the water inlet direction of feed-pipe is the tangential direction of crystallisation chamber inwall; Discharge nozzle, one end of discharge nozzle is communicated with crystallisation chamber; Three-way pilot valve, three interfaces of three-way pilot valve are communicated with the other end of thickener, feed-pipe and the other end of discharge nozzle respectively; And water pump, water pump is connected between feed-pipe and discharge nozzle.
For high salt organic waste water, although through pre-treatment and biochemical treatment, but wherein still containing a certain amount of organism, the evaporation crystallization equipment of above strong brine vaporised liquid Zero emission device or process high-salt wastewater is utilized to carry out evaporative crystallization to high-salt wastewater, obtain crystal salt and comprise a large amount of organism, be difficult to process further and recycle, special filling up can only be carried out as solid waste.For a certain medium-and-large-sized coal chemical industry enterprises, the enterprise of one annual output 20 billion cubic meter coal preparing natural gas, the solid waste of generation per hour is more than 3 tons, need 3000 yuan of calculating by dangerous solid waste landfill per ton, annual landfill expense is 7,200 ten thousand (running 8000 hours by annual).This is for enterprise, can not bear so huge landfill expense.
Carry out composition analysis by the solid waste produced wastewater zero discharge, we find, wherein inorganic salt account for absolute majority, particularly NaCl and Na
2sO
4component, generally the content of these two kinds of salt is more than 90%.Therefore, if by NaCl and Na
2sO
4be separated with other materials, then can reduce by the solid waste of more than 90%, greatly reduce the expense of solid waste landfill, obtain NaCl, Na simultaneously
2sO
4mixing salt, as the raw material of sal prunella coproduction industry, is turned waste into wealth, and produces certain economic benefit.Realize this point, require below demand fulfillment: NaCl, Na of 1, separating
2sO
4must be very pure, reach the related standards of country and industry; 2, control the concentration of other pollutents, can not with NaCl, Na
2sO
4crystallization simultaneously, and must ensure that the output of wastewater mother liquor is very little simultaneously, namely the concentration of other pollutents is enough dense.
Chinese patent CN201220674349.X discloses a kind of ketazine process and produces the wastewater treatment of hydrazine hydrate and carry the device of salt, this device comprises the brine waste hold-up vessel connected in turn, interchanger, evaporative crystallizer, first whizzer, saturated brine washer, second whizzer, the crystalline mother solution outlet of evaporative crystallizer is connected with the entrance of reactor, the outlet of reactor is connected with the entrance of storage of waste water tank, the condensation-water drain of evaporative crystallizer is connected with cold water storage tank entrance, the outlet of cold water storage tank is connected with the entrance at biochemical treatment station, the centrifuge mother liquor outlet of the first whizzer is connected with the entrance of evaporative crystallizer, the centrifuge mother liquor outlet of the second whizzer is connected with the entrance of saturated brine washer.
Although this device can improve the purity of crystal salt by washing crystal salt, it can only clean the wet salt through the first centrifuge resulting separation, and cause its complex structure, processing efficiency is low.And this patent does not also disclose the concrete structure of saturated brine washer.
Summary of the invention
For the shortcoming of prior art, the object of the present invention is to provide a kind of evaporative crystallization salt making equipment for high salt organic waste water process and Waste Water Treatment, under its state that can mix with waste water at crystal salt grain, crystal salt grain is washed.
In order to realize above-mentioned goal of the invention, on the one hand, the invention provides a kind of evaporative crystallization salt making equipment for high salt organic waste water process, comprise flash tank, it has the first recirculated water entrance and is positioned at the circulating water outlet under the first recirculated water entrance, circulating water outlet is connected by circulating line with the first recirculated water entrance, and circulating line is provided with heating unit.Evaporative crystallization salt making equipment also comprises and to be connected with the bottom of flash tank and through salt washs leg, salt washing leg comprises further: be positioned at salt washing leg, enter water direction top water inlet down, the waste water be positioned at below the water inlet of top, being configured to make salt wash leg produces the middle part water inlet of eddy flow, and is positioned at the salt outlet below the water inlet of middle part.
Evaporative crystallization salt making equipment of the present invention be applicable to process sodium salt content be its dissolved solution degree more than 50%, other pollutant loads are the high salt organic waste water of less than 5% of its dissolved solution degree.Consider from the angle of raising the efficiency, reducing energy consumption, evaporative crystallization salt making equipment of the present invention is preferred for processing the high salt organic waste water that sodium salt content is more than 60% of its dissolved solution degree, is more preferably the high salt organic waste water of more than 75% of its dissolved solution degree for the treatment of sodium salt content.
The workflow of evaporative crystallization salt making equipment of the present invention is as follows:
Use the waste water in the heating devices heat circulating line of such as pump circulation interchanger etc., the thermal wastewater excessively that heating obtains is delivered in flash tank through circulating line and carries out flash distillation, due to the evaporation of moisture, NaCl and Na in the thermal wastewater after concentrated
2sO
4reach hypersaturated state, separate out NaCl, Na
2sO
4crystal grain.Because its density is greater than the density of waste water, crystal grain enters in salt washing leg along with the flowing of thermal wastewater and action of gravity move downward, and constantly collision mutually in moving process, combines and " growing up ".
The crystal salt grain entered by flash tank and thermal wastewater and the pending waste water sprayed into by top water inlet wash in leg at salt and fully mix.Due to NaCl, Na in pending waste water
2sO
4content higher, even close to its saturation concentration, and the concentration of other pollutents reaches capacity far away, therefore NaCl, Na
2sO
4substantially can keep the crystal grain formed, and other pollutents being attached to grain surface that reach capacity can dissolve again, that is, the waste water sprayed into by top water inlet can to NaCl, the Na begun to take shape
2sO
4crystal grain plays cleaning function, thus obtains pure NaCl, Na
2sO
4crystal grain.
Crystal salt grain after washing continues to move downward, centrifugal motion is made under the drive of the pending waste water sprayed into by middle part water inlet, due to centrifugation, the crystal salt grain that particle diameter is larger moves to the inwall of salt washing leg, and circle arrival salt outlet, thus discharge salt washing leg, thinner crystal salt grain then continues the bottom motion to salt washing leg.Meanwhile, the waste water sprayed into by middle part water inlet also can play further cleaning function to crystal salt grain.
Therefore, under the state that evaporative crystallization salt making equipment of the present invention can mix with waste water at crystal salt grain, crystal salt grain is washed, there is the advantage that structure is simple, processing efficiency is high.
In the present invention, top water inlet is preferably placed on the longitudinal axis of salt washing leg, forms pyramid type current and sprays into, and makes the crystal salt grain that entered by flash tank and thermal wastewater and the waste water that sprayed into by top water inlet have more sufficient mixed effect.
In the present invention, middle part water inlet can be vortex filament shape curved surface entrance, tangent line shape entrance, spiral yarn shaped entrance, concentric(al) circles annular entry, involute urve shape entrance, arc line shaped entrance or spiral of Archimedes shape entrance, thus the waste water that salt is washed in leg produces eddy flow.
According to an embodiment of the present invention, salt washing leg below that is interior, salt outlet is also provided with into water direction bottom water inlet down.Preferably, bottom water inlet is positioned on the longitudinal axis of salt washing leg, sprays into waste water downwards.
As mentioned above, the bottom motion of washing leg compared with fine crystallization salt grain to salt of not discharged by salt outlet, and the waste water sprayed into by bottom water inlet makes crystal salt grain move upward, in the process moved upward, collide with the crystal salt grain moved downward, combine the crystal salt grain forming larger particle, thus can discharge from salt outlet, therefore, the comparatively uniform crystal salt grain of granularity can be obtained.Particularly when bottom water inlet sprays into waste water downwards, waste water first promote thinner crystal salt grain move downwardly to salt washing leg bottom after oppositely move upward again, remarkable lifting crystal salt grain collision, the probability combined, make crystal salt grain grow up quickly and discharge from salt outlet.Meanwhile, the waste water sprayed into by bottom water inlet has cleanup action to crystal salt grain equally, further reduces organic content in crystal salt grain.
According to another embodiment of the present invention, the below of the first recirculated water entrance is also provided with the second recirculated water entrance, second recirculated water entrance is connected with circulating line, for spraying into the waste water through heating devices heat to the bottom of flash tank and/or the top of salt washing leg.Such as, after heating devices heat, the thermal wastewater of crossing of 5-15% volume enters the bottom of flash tank and/or the top of salt washing leg by the second recirculated water entrance, and the thermal wastewater of crossing of 85-95% volume is entered in flash tank by the first recirculated water entrance.
In the present invention, the second recirculated water entrance can be arranged on the intersection of flash tank and salt washing leg, also can be arranged on the bottom of flash tank or the top of salt washing leg.The thermal wastewater of crossing entered by the second recirculated water entrance discharges at the top of the bottom of flash tank and/or washing leg, the vapour transmission thermal wastewater formed is released into the top of flash tank, steam, in the process risen, forms bubble, to NaCl, Na of being formed in its top thermal wastewater as " brush "
2sO
4crystal grain is cleaned, and makes to be attached to NaCl, Na
2sO
4other pollutents such as the organism of grain surface are dissolved in thermal wastewater again.NaCl, Na after scouring
2sO
4crystal grain then enters in salt washing leg, and the waste water sprayed into by top water inlet washed.
Therefore when utilizing evaporative crystallization salt making equipment of the present invention to carry out wastewater treatment, crystal salt grain is repeatedly cleaned in the process of growing up, therefore, even if other pollutents in crystal salt intragranular portion are also effectively removed.On the contrary, wastewater treatment of the prior art and carry salt device and only could wash it after crystal salt grain is separated with waste water, therefore prior art can only clean other pollutents on crystal salt grain surface, then helpless to parcel other pollutents therein.
According to another embodiment of the present invention, between the first recirculated water entrance and circulating water outlet, be provided with the recirculation baffle plate that both stops are directly relative.Recirculation baffle directs crystal salt grain, to the motion of salt washing leg, reduces the crystal salt grain quantity to circulating water outlet motion, to prevent crystal salt grain from blocking circulating water outlet and/or circulating line, avoids producing short circuit phenomenon during waste water circulation.
Preferably, recirculation baffle plate hides circulating water outlet from the top of circulating water outlet and has obliquely towards the inclined surface of salt washing leg top droop, make waste water enter circulating water outlet under recirculation baffle plate, avoid crystal salt grain to be directly deposited to circulating water outlet place with waste water.
According to another embodiment of the present invention, salt washing leg is directly connected with flash tank, simplified apparatus structure, and makes the crystal salt grain in flash tank enter rapidly salt washing leg, improves waste water treatment efficiency.
According to another embodiment of the present invention, the top in salt washing leg is provided with the drainage part extending longitudinally along salt washing leg, and the internal perisporium of the periphery wall of drainage part and salt washing leg limits an annular fluid passage.Preferably, the top that drainage part washs leg by salt extends to the position roughly concordant with top water inlet.The cross-sectional area of annular fluid passage is preferably the long-pending 1/8-7/8 of salt washing leg lumenal cross-section, is more preferably 1/4-1/2.
In the present invention, the cross-sectional area of annular fluid passage is less than the cross-sectional area of salt washing leg inner chamber, and therefore, compared with not arranging the situation of drainage part, crystal salt grain can be washed the lower motion of leg quickly to salt by flash tank.In addition, crystal salt grain moves downward near the inwall of salt washing leg in annular fluid passage, can be discharged quickly, improve the processing efficiency of waste water by salt outlet.
According to another embodiment of the present invention, middle part water inlet adopts structure simple tangent line shape entry design, and the tangential direction be configured to along salt washing leg inwall extends.
According to another embodiment of the present invention, salt outlet adopts structure simple tangent line shape exit design, and the tangential direction be configured to along salt washing leg inwall extends, thus crystal salt grain can be discharged quickly in salt washing leg.
According to another embodiment of the present invention, circulating line is provided with at least one mother liquor discharge-channel, its mother liquor outlet that there is mother liquor entrance and be positioned at mother liquor entrance top.
When evaporative crystallization salt making equipment of the present invention is used for wastewater treatment, the waste water in flash tank after flash distillation enters in the process of circulating line, can enter in circulating line by entrainment portions crystal salt grain more or less.In the present invention, mother liquor entrance is arranged on the below of mother liquor outlet, proportion due to crystal salt grain is greater than the proportion of wastewater mother liquor, when waste discharge mother liquor, under gravity, crystal salt grain moves downward, and wastewater mother liquor then can be discharged, by simple gravity separation from the mother liquor outlet of height point, crystal salt grain can be separated with wastewater mother liquor, effectively prevent crystal salt grain from discharging with mother liquor.
According to another embodiment of the present invention, first recirculated water entrance is positioned on the longitudinal axis of flash tank, and enter water direction down, thermal wastewater was uniformly distributed along the radial direction of flash tank, make full use of the flash distillation area of flash tank, make flash vaporization process carry out uniformly and stably and violent boiling phenomenon does not occur, reduce abrasion.
Preferably, recirculated water entrance enters at it cross-sectional area water direction having and increases gradually, makes the thermal wastewater of crossing in circulating line enter in flash tank after slowing down, avoids liquid foam entrainment and short circuit.
On the other hand, in order to realize object of the present invention, present invention also offers a kind of Waste Water Treatment processing high salt organic waste water, it comprises any one evaporative crystallization salt making equipment as above.
According to an embodiment of the present invention, Waste Water Treatment also comprises the equipment for separating liquid from solid be connected with salt outlet, and it is separated the crystal salt grain and waste water of being discharged by salt outlet.
Compared with prior art, under the state that evaporative crystallization salt making equipment of the present invention and Waste Water Treatment can mix with waste water at crystal salt grain, crystal salt grain is repeatedly washed, structure is simple, and waste water treatment efficiency is high, cost is low, and the crystal salt grain purity obtained is high.
Below in conjunction with drawings and Examples, the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is the structural representation of evaporative crystallization salt making equipment embodiment of the present invention;
Fig. 2 is the structural representation of flash tank in Fig. 1;
Fig. 3 is the structural representation of salt washing leg in Fig. 1;
Fig. 4 is the structural representation of mother liquor separator in Fig. 1.
Embodiment
As shown in Figure 1, evaporative crystallization salt making equipment embodiment of the present invention comprises: circulating line 10, recycle pump 20, heating unit 30, flash tank 40, salt washing leg 50.
Circulating line 10 is vertically arranged, and have roughly U-shaped structure, two vertical arm are tightly connected with flash tank 40 respectively, and the recycle pump 20 being arranged on circulating line 10 bottom fold place realizes waste water circulating in circulating line 10, heating unit 30 and flash tank 40.First vertical arm is provided with waste water inlet 11 and mother liquor separator 12, and waste water inlet 11 is positioned at the below of mother liquor separator 12.Waste water inlet 11 for inputting the waste water of salinity to be extracted in circulating line 10, and mother liquor separator 12 is for discharging the wastewater mother liquor extracting and obtain after salinity.
Heating unit 30 is arranged in the second vertical arm of circulating line 10, for heating to make it reach superheat state to by the waste water entering flash tank 40.Heating unit 30 is pump circulation interchanger, and steam is inputted by the steam-in 31 being positioned at pump circulation interchanger top, and the phlegma formed after heat exchange is discharged from the leakage fluid dram 32 being arranged on pump circulation interchanger bottom.
As shown in Figure 2, flash tank 40 is vertically arranged, and comprises small end coniform steam upward from top to bottom successively and discharges section 41, columned flash distillation segment occurred 42 and small end coniform product discharge section 43 down.
Shown in composition graphs 1-3, waste water in circulating line 10 splits into two strands after heating, wherein most thermal wastewater of crossing enters flash distillation segment occurred 42 through circulating line first branch line 13 downwards by the first recirculated water entrance 421 being positioned at flash distillation segment occurred 42 bottom, and the thermal wastewater of crossing of all the other small portions enters the bottom of flash tank 40 and the top of salt washing leg 50 through circulating line second branch line 14 downwards by the second recirculated water entrance 431 being positioned at product discharge section 43 and salt washing leg 50 intersection.First recirculated water entrance 421 and the second recirculated water entrance 431 are large end cone shaped opening down, and are arranged on the longitudinal axis of flash tank 40.First recirculated water entrance 421 by conical distribution baffle plate 4211 limit and obtain.The steam that flash distillation produces is discharged by the steam outlet 411 being arranged on steam discharge section 41 top, most of waste water in flash tank 40 to enter in circulating line 10 to do re-treatment by the circulating water outlet 432 being arranged on product and discharging section 43 sidewall, remain small part waste water then syncrystallization salt grain enter in salt washing leg 50.
Recirculation baffle plate 433 is provided with above circulating water outlet 432, between the first recirculated water entrance 421 and circulating water outlet 432, the side that recirculation baffle plate 433 discharges section 43 from product extends and has obliquely towards the inclined surface of the top droop of salt washing leg 50, to cover circulating water outlet 432 from top and to guide crystal salt grain to the direction motion of salt washing leg 50, avoid crystal salt grain to block circulating water outlet 432, and the least possible crystal salt grain is entered in circulating line 10 by circulating water outlet 432.
Shown in composition graphs 1 and Fig. 3, salt washing leg 50 is directly connected with flash tank 40, and the longitudinal axis of the two is overlapping.Top in salt washing leg 50 is provided with drainage part 51, and it is fixed on the inwall of salt washing leg 50 by support rod.Drainage part 51 is the hollow tube of upper end closed, and its diameter is about 1/2 of salt washing leg 50 intracavity diameter, and the annular fluid passage 511 that crystal salt grain and waste water limit along the periphery wall of drainage part 51 and the internal perisporium of salt washing leg 40 moves downward.Position in drainage part 51 bottom drainage part 51 is provided with top water inlet 52, and top water inlet 52 is positioned on the longitudinal axis of salt washing leg 50, and the waste water of salinity to be extracted forms pyramid type current downwards by top water inlet 52 and sprays into.The below of top water inlet 52 is provided with the middle part water inlet 53 of the tangential direction extension along salt washing leg 50 inwall, the waste water of salinity to be extracted enters salt by middle part water inlet 53 and washs in leg 50, crystal salt grain and solution mixture is made to form eddy flow, under the action of the centrifugal, the crystal salt grain that particle diameter is larger moves to the inwall of salt washing leg 50, and circle, arrive the salt outlet 54 be positioned at below the water inlet 53 of middle part, the tangential direction of washing leg 50 inwall along salt by salt outlet 54 is discharged, and thinner crystal salt grain then continues to move downward.Be provided with in the below of salt outlet 54 bottom water inlet 55, bottom water inlet 55 be positioned at salt washing leg 50 longitudinal axis on and near salt washing leg 50 bottom.Bottom water inlet 55 sprays into the waste water of salinity to be extracted downwards, thinner crystal salt grain is moved upward, the crystal salt grain moved upward and the crystal salt grain moved downward constantly mutually collide, tie coalescence, thus can be discharged by salt outlet 54, prevent from crystal salt grain from blocking at bottom deposit being arranged on the sewage draining exit 56 bottom salt washing leg 50.
Top water inlet 52, middle part water inlet 53 and bottom water inlet 55 are connected to the first waste water service 60 respectively, waste water inlet 11 is connected to the second waste water service (not shown), first waste water service 60 and the second waste water service are connected to waste water source, such as, through waste water (not shown) that evaporation concentration in advance obtains.First waste water service 60 is provided with the first wash-down water import 61, circulating line second branch line 14 is provided with the second wash-down water import 141.
As shown in Figure 4, mother liquor separator 12 limits two mother liquor discharge-channels 121, and each mother liquor discharge-channel 121 has mother liquor entrance 1211 and mother liquor outlet 1212 respectively, and each mother liquor entrance 1211 lays respectively at the below of corresponding mother liquor outlet 1212.Every the scheduled time, namely when waste water to make through circular treatment that wherein organic content reaches certain numerical value, wastewater mother liquor is discharged by mother liquor discharge-channel.
Above-mentioned evaporative crystallization salt making equipment embodiment can the device suitable with other or equipment connection, forms Waste Water Treatment.Such as, salt outlet 54 is connected with an equipment for separating liquid from solid (not shown), and equipment for separating liquid from solid is separated the crystal salt grain and waste water of being discharged by salt outlet 54, thus realizes being separated of crystal salt grain and waste water, obtains pure crystal salt grain.
Utilize the method for above-mentioned Waste Water Treatment selective extraction salinity from high salt organic waste water as follows:
1. heat pending waste water, make it be in superheat state;
2. 1. the obtained thermal wastewater of crossing at least partially of step is made to enter the bottom of flash tank and/or the top of salt washing leg by the second recirculated water entrance, all the other are crossed thermal wastewater and then enter flash tank by the first recirculated water entrance be positioned on the second recirculated water entrance, the waste water that flash distillation obtains enter circulating line by circulating water outlet and repeating step 1., crystal salt grain then enter salt washing leg;
3. spray into pending waste water waste water downwards by the top water inlet of salt washing leg, crystal salt grain is cleaned;
4. wash midleg water inlet by salt and spray into pending waste water, make to be cleaned the larger crystal salt grain of rear particle diameter and make centrifugal motion and discharged by the salt outlet of salt washing leg;
5. the crystal salt grain and waste water of being discharged by salt outlet is separated;
6. the wastewater mother liquor obtained after extracting salinity is discharged.
Although the present invention discloses as above with preferred embodiment, and is not used to limit scope of the invention process.Those of ordinary skill in the art, not departing from invention scope of the present invention, the equal improvement done according to the present invention, should be invention scope of the present invention and contained.
Claims (10)
1. the evaporative crystallization salt making equipment for high salt organic waste water process, comprise flash tank, it has the first recirculated water entrance and is positioned at the circulating water outlet under described first recirculated water entrance, described circulating water outlet is connected by circulating line with described first recirculated water entrance, described circulating line is provided with heating unit, wherein, described evaporative crystallization salt making equipment also comprises and to be connected with the bottom of described flash tank and through salt washs leg, and described salt washing leg comprises further:
Be positioned at described salt washing leg, enter water direction top water inlet down;
Be positioned at the middle part water inlet below the water inlet of described top, the waste water that described middle part water inlet is configured to described salt is washed in leg produces eddy flow; With
Be positioned at the salt outlet below the water inlet of described middle part.
2. evaporative crystallization salt making equipment as claimed in claim 1, wherein, described salt washing leg below that is interior, described salt outlet is also provided with into water direction bottom water inlet down.
3. evaporative crystallization salt making equipment as claimed in claim 1, wherein, the below of described first recirculated water entrance is also provided with the second recirculated water entrance, described second recirculated water entrance is connected with described circulating line, for spraying into the waste water through described heating devices heat to the bottom of described flash tank and/or the top of described salt washing leg.
4. evaporative crystallization salt making equipment as claimed in claim 1, wherein, is provided with the recirculation baffle plate that both stops are directly relative between described first recirculated water entrance and described circulating water outlet.
5. evaporative crystallization salt making equipment as claimed in claim 1, wherein, described salt washing leg is directly connected with described flash tank.
6. evaporative crystallization salt making equipment as claimed in claim 1, wherein, top in described salt washing leg is provided with the drainage part extending longitudinally along described salt washing leg, and the internal perisporium of the periphery wall of described drainage part and described salt washing leg limits an annular fluid passage.
7. evaporative crystallization salt making equipment as claimed in claim 1, wherein, described middle part water inlet is configured to extend along the tangential direction of described salt washing leg inwall.
8. evaporative crystallization salt making equipment as claimed in claim 1, wherein, described circulating line is provided with at least one mother liquor discharge-channel, and described mother liquor discharge-channel has mother liquor entrance and is positioned at the mother liquor outlet of described mother liquor entrance top.
9. evaporative crystallization salt making equipment as claimed in claim 1, wherein, the longitudinal axis that described first recirculated water entrance is positioned at described flash tank enters water direction down.
10. process a Waste Water Treatment for high salt organic waste water, it comprises the evaporative crystallization salt making equipment as described in one of claim 1-9.
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| CN105859007A (en) * | 2016-05-27 | 2016-08-17 | 北京国电富通科技发展有限责任公司 | Purifying and salt manufacturing system and method for wastewater with high salt content and high organic matter content |
| CN106976890A (en) * | 2016-01-18 | 2017-07-25 | 同方环境股份有限公司 | A kind of strong brine Crystallization Separation device with mother liquor separator |
| CN106977032A (en) * | 2016-01-18 | 2017-07-25 | 同方环境股份有限公司 | A kind of band washs the strong brine Crystallization Separation device of leg |
| CN107176762A (en) * | 2017-06-30 | 2017-09-19 | 大连理工大学 | A kind of high salt, high concentrated organic waste liquid low temperature crystallization and desiccation purifier and method |
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| CN106976890A (en) * | 2016-01-18 | 2017-07-25 | 同方环境股份有限公司 | A kind of strong brine Crystallization Separation device with mother liquor separator |
| CN106977032A (en) * | 2016-01-18 | 2017-07-25 | 同方环境股份有限公司 | A kind of band washs the strong brine Crystallization Separation device of leg |
| CN105859007A (en) * | 2016-05-27 | 2016-08-17 | 北京国电富通科技发展有限责任公司 | Purifying and salt manufacturing system and method for wastewater with high salt content and high organic matter content |
| CN107176762A (en) * | 2017-06-30 | 2017-09-19 | 大连理工大学 | A kind of high salt, high concentrated organic waste liquid low temperature crystallization and desiccation purifier and method |
| CN108191130A (en) * | 2017-12-28 | 2018-06-22 | 北京国电富通科技发展有限责任公司 | A kind of high organic wastewater evaporative crystallization antiscaling treatment method with high salt and device |
| CN108191130B (en) * | 2017-12-28 | 2020-11-10 | 北京国电富通科技发展有限责任公司 | High-salt high-organic matter wastewater evaporative crystallization anti-scaling treatment device and method |
| CN110589917A (en) * | 2019-09-30 | 2019-12-20 | 广东闻扬环境科技有限公司 | Forced circulation separator |
| CN111646624A (en) * | 2020-06-11 | 2020-09-11 | 临海市泰通医化设备有限公司 | Organic salt recovery separator |
| CN111646624B (en) * | 2020-06-11 | 2022-07-12 | 临海市泰通医化设备有限公司 | Organic salt recovery separator |
| CN111762831A (en) * | 2020-07-01 | 2020-10-13 | 江阴市江中设备制造有限公司 | Acid-base waste water evaporator |
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