CN108328844A - A kind of deep purifying handles the technique and system of fluorine-containing gas liquor - Google Patents
A kind of deep purifying handles the technique and system of fluorine-containing gas liquor Download PDFInfo
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- CN108328844A CN108328844A CN201810352441.6A CN201810352441A CN108328844A CN 108328844 A CN108328844 A CN 108328844A CN 201810352441 A CN201810352441 A CN 201810352441A CN 108328844 A CN108328844 A CN 108328844A
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- 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
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- 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
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/10—Treatment of water, waste water, or sewage by heating by distillation or evaporation by direct contact with a particulate solid or with a fluid, as a heat transfer medium
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- 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
- C02F1/24—Treatment of water, waste water, or sewage by flotation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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- 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
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- 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
- C02F2101/10—Inorganic compounds
- C02F2101/12—Halogens or halogen-containing compounds
- C02F2101/14—Fluorine or fluorine-containing compounds
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- Organic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention discloses techniques and system that a kind of deep purifying handles fluorine-containing gas liquor, the technique is by the pending fluorine-containing gas liquor of high pressure first through first passing through flash separation, the pretreatment of air-float filtration, middle pressure stripping realization gas liquor, then milk of lime and calcium chloride are added by distribution, strengthen and promote the chemical precipitation effect of fluorine ion in fluorine-containing gas liquor, then realize that the deep purifying of fluorine-containing gas liquor is handled using coagulating sedimentation, flocculation sediment treatment process, treated, and fluorine content meets discharge standard≤10mg/L qualifications discharge.The present invention can be with deep removal fluorine ion, and removal efficiency is high（95%‑99%）Add single defluorinating agent defluorinate technological process for purifying and device better than tradition, and few with defluorinating agent dosage, sludge yield is few, unit scale, consumption and floor space is small, advantages of environment protection.
Description
Technical field
The invention belongs to technical field of coal chemical industry, are related to a kind of process and device of coal gas purifying water process process,
The technique and system of the fluorine-containing gas liquor of coal chemical industry are handled more particularly, to a kind of deep purifying.
Background technology
Belong to fixed bed pressured gasification stove in coal chemical technology lurgi gasifier, due to the characteristic of its gasification process conditions,
When coal generates gas liquor in the operational sequences such as gasification, rough coal gas washing, condensation separation, purification, complicated component is various, contains
A large amount of coal dust, light oil, tar, phenols, benzene class, ammonia etc., intractability is bigger, this is also that the Coal Gasification Technology is answered in market
One of the main problem encountered with popularization；When using fluorine-containing coal as gasification raw material, fluoride therein occurs to divide
Solution enters in raw gas, after the processing of the processes such as postorder rough coal gas washing, refrigerated separation, also enters in coal gas waste,
On the basis of script ingredient is with regard to very complicated gas liquor, and increase the difficulty of fluorine removal.
Due to fluorine be to plant, the maximum element of animal and Health Impact face,《Integrated wastewater discharge standard》
GB8978-1996 provides that fluorine first discharge standard is 10mg/L in industrial wastewater, and fluorine-containing gas liquor must qualified granting up to standard.
Domestic and international conventional purification handles fluoride waste technique：The precipitation method, absorption method and ion-exchange can not all be completed
State the defluorinate work of the fluorine-containing gas liquor of complicated ingredient.How to realize that more intractable fluorine-containing gas liquor further completes defluorinate originally
Task, become the thorny problem for solving fluorine-containing coal using the coal gas water process of Lurgi coal gasification.
Invention content
In order to solve the problems in the existing technology, the invention discloses a kind of deep purifyings to handle fluorine-containing gas liquor
Technique and system first pass through flash separation, the pretreatment of air-float filtration, middle pressure stripping realization gas liquor, then according to homo-ion
Effect is principle, is added by the multiple step format of compound defluorinating agent, and the chemical precipitation of fluorine ion in fluorine-containing gas liquor is strengthened and promote
Then effect realizes that the deep purifying of fluorine-containing gas liquor is handled using coagulating sedimentation, flocculation sediment treatment process, treated
Fluorine content meets discharge standard≤10mg/L qualifications discharge.The present invention process and device can with deep removal fluorine ion,
Removal efficiency is high（95%-99%）Single defluorinating agent defluorinate technological process for purifying and device are added better than tradition, and there is defluorinating agent
Dosage is few, sludge yield is few, unit scale, consumption and floor space is small, advantages of environment protection.
The present invention is achieved through the following technical solutions：
On the one hand, the invention discloses the technique that a kind of deep purifying handles fluorine-containing gas liquor, which is by pending height
Fluorine-containing gas liquor is pressed first to make its soluble escaping gas effusion that can be adjusted by controlling flashing pressure through vacuum flashing boiling
Soluble composition effusion separation to be removed in whole fluorine-containing gas liquor；Then coal is made by the tar separator in vacuum flashing device again
The separation of solid and liquid such as tar and coal dust in air water, then further remove edible vegetable oil and suspended matter through partial reflux pressurized dissolved air flotation
Afterwards, oil and the removing to suspend purification are carried out into double medium filters, oil content is obtained by filtration and is less than (15-20) mg/L, suspends
Object is less than the fluorine-containing gas liquor of (25-30) mg/L, calms the anger and carries during filtered fluorine-containing gas liquor pressurization is carried out, fluorine-containing gas liquor
In ammonia, organic matter be stripped and separate, and using its together with stripping gas together enter gasification furnace as gasification furnace gasification original
Material realizes that waste comprehensive recycling is decomposed into the effective gas component of gasification；Fluorine-containing gas liquor after air lift is delivered to chemical precipitation
Pond first launches milk of lime into chemical settling pond, then adds calcium chloride solution to chemical settling pond supernatant layer, make gas liquor
In fluorine ion reaction generate fluoride precipitation, and depth reduce free state content of fluoride ion, obtain fluorinion concentration and be less than（5~
10）Then gas liquor is sent to pH regulating reservoirs and is added after pH value is adjusted to 5-9 by pH adjusting agent by the gas liquor of mg/L, into mixed
Simultaneously coagulant is added in solidifying pond, then introduces flocculation basin and so that flocculant and gas liquor is sufficiently mixed by stirring, keeps fluoride heavy
The pollutants such as starch, remaining fluorine ion absorption, net catch, electrically in and under the action of form big alumen ustum, then by stirring
Mixing device, plug-flow enters sludge settling concentration basin at a slow speed, is divided qualification production water with alumen ustum sludge settling using the reverse flow of inclined tube module
From, and part alumen ustum sludge settling is back to flocculation basin, be especially by the smaller alumen ustum of density by settling zone at the top of
Inclined tube area is divided into a series of shallow layer precipitating layer, clear water and smaller the alumen ustum phase in each precipitation shallow-layer using shallow pool principle
Mutually moves and detach layering and precipitating;The larger alumen ustum Direct precipitation of density, bottom separated sludge precipitate a part of sludge and continuously follow
Ring is to flocculation basin reuse；A part is collected by mud scraper in bucket, is periodically discharged by sludge pump；Top qualification production water reaches
Mark, which can be arranged or be sent in addition to follow-up waste water, refines reuse working procedure systems.
The qualified production water part that as a preferred implementation manner, sludge settling concentration basin can also be generated is for matching
Milk of lime and calcium chloride solution processed.
The fluorine-containing gas liquor of pending high pressure is produced by coal gas and/or shift conversion step as a preferred implementation manner,
Raw first makes the gas liquor that tar and coal dust detach through vacuum flashing boiling, is washed with being cooled down by coal gas and/or becoming low-temp methanol
It generates and detaches what the gas liquor after edible vegetable oil converged.
On the other hand, the system that a kind of deep purifying handles fluorine-containing gas liquor, including：
Flash separation device is detached for receiving pending fluorine-containing high pressure coal air water, and by tar therein and coal dust；
The water inlet of air-floating apparatus, the air-floating apparatus is connected to the water outlet of flash separation device, for further removing coal
Edible vegetable oil and suspended matter in air water；
Filter device, the water inlet of the filter device are connected to the water outlet of air-floating apparatus, for oil and suspension is further
Removing purification obtains oil content and is less than (15-20) mg/L, and suspended matter is less than the gas liquor of (25-30) mg/L；
Stripper plant, the stripper plant are equipped with water inlet, water outlet, middle pressure steam import and gas stripping gas outlet, the vapour
The water inlet for carrying device is connected to the water outlet of filter device；
Chemical precipitation pond, the chemical precipitation pond are equipped with water inlet, water outlet, lime milk intlet, calcium chloride import, describedization
The water inlet for learning sedimentation basin is connected to the water outlet of stripper plant, the water inlet of the water outlet and pH regulating reservoirs in the chemical settling pond
Mouth connection；The lime milk intlet in the chemical precipitation pond is connected to the discharge port of milk of lime preparation vessel, and in the milk of lime system
Standby slot is equipped with quick lime feed inlet and water inlet；The discharging of the calcium chloride import and calcium chloride preparation vessel in the chemical precipitation pond
Mouth connection, and calcium chloride feed inlet and water inlet are equipped on the calcium chloride preparation vessel；
The water inlet of coagulating basin, the coagulating basin is connected to the water outlet of pH regulating reservoirs, for pH value is defeated for the gas liquor of 5-9
It send to coagulating basin to react with coagulant and generates small flco；
Flocculation basin, the water inlet of the flocculation basin are connected to the water outlet of coagulating basin, for making small flco be agglomerated with flocculant
At large stretch of flco；
Sludge settling concentration basin, the sludge settling concentration basin is equipped with water inlet, sludge outlet, qualified production water out, described
The water inlet of sludge settling concentration basin is connected to the water outlet of flocculation basin.
As a preferred implementation manner, the qualified production water out of the sludge settling concentration basin respectively with the milk of lime
The water inlet of preparation vessel is connected to the water inlet on calcium chloride preparation vessel.
Agitating device, flocculant concentration ring and deflector are equipped in the flocculation basin as a preferred implementation manner,；Institute
It is double medium filters to state filter device.
The present invention utilize milk of lime and calcium chloride joint defluorinate, milk of lime mainly utilize milk of lime in calcium ion, with containing
Fluorine ion reaction in fluorine gas liquor generates calcium fluoride precipitate, realizes the removal of fluorine ion.But since newly-generated calcirm-fluoride is heavy
There is certain solubility in shallow lake（1.6mg/100g）, the fluorinion concentration of calcium fluoride precipitate dissolving is greater than when actual industrialization is applied
7.8mg/L；On the other hand：The water solubility of milk of lime is very low, can not provide the calcium ion of sufficient amount, above-mentioned single to solve
Feeding lime breast is unable to the case where deep purifying fluorine-containing gas liquor, is used in combination by milk of lime and calcium chloride, on the one hand provides
Sufficient calcium ion；On the other hand according to common-ion effect, calcirm-fluoride in gas liquor can be influenced by adding calcium chloride
Dissolution equilibrium reduces the solubility of calcirm-fluoride, further decreases after chemical precipitation free state content of fluoride ion in gas liquor.Joint
The advantages of adding calcium chloride is：Calcium chloride is neutral pole lyotropic salt, is capable of providing a large amount of calcium ion, and will not be to fluorine-containing coal
The acid-base property of air water impacts；Compared to relatively usual single milk of lime chemical precipitation method, to plead in identical defluorinate purified treatment
Under condition, the dosage of milk of lime can be greatly decreased, be typically only theoretical requirement value（0.5~1.0）Times, to make processing
The glar quantity of slag afterwards is also greatly reduced, and further decreases the processing cost of solid waste.
Common-ion effect in the present invention refers to the solubility product constant according to calcirm-fluoride, work as temperature
One timing, solubility product constantIt is certain value, increases calcium ion, the fluorine ion of the free state in gas liquor can be made
It further decreases.
What is added in the present invention is solution state milk of lime and calcium chloride, using by apparatus of the present invention treated qualified production water
Partial reflux dissolves solid-state quick lime, calcium chloride, prepares solution state milk of lime/calcium chloride of respective concentration.Compare solid shape
State defluorinating agent, being easy to control with addition for solution state, is quickly reacted, and abundant advantage is reacted.By being closed after processing
Solution state milk of lime and calcium chloride are prepared in the reflux of lattice wastewater fraction, can reduce the fresh water of dissolving solid-state quick lime and calcium chloride
Usage amount, and the discharge capacity of waste water can be reduced.
Using first feeding lime breast in the present invention, generation fluorination is reacted after right milk of lime is thoroughly mixed with waste water
Calcium, after removing most of fluorine ion；Then calcium chloride is added in clear liquid on it, supplements calcium ion, utilize homo-ion effect
It answers, remaining fluorine ion can be further decreasedExtremely（10~5）Mg/L or less.The removal rate of the fluorine ion of its fluorine-containing gas liquor
95% ~ 99%, individually add Ca (OH) higher than tradition2Method.
After solution state milk of lime and calcium chloride are prepared in this bright middle qualified production water part reflux, can direct standard discharge,
Return system after waste water refines reuse process processing can also be sent to recycle as recirculated cooling water, boiler feedwater, reduced
The fresh water consumption of enterprise and the discharge capacity of waste water.
Certain pressure in the present invention（High pressure）Fluorine-containing gas liquor by flash process handle, flash vaporization expanding effusion it is solvable
Property gas collection be incorporated to pipe network, it is unified to be recycled, avoid impacting surrounding enviroment；It is detached through tar, coal dust, according to
In coal gas tar content can series multistage tar separator improved with extending gas liquor in the residence time of tar separation process
Tar separation effect.
Tar separator is designed as enclosed construction in the present invention, and tar separation process emergent gas is incorporated to pipe network by pipeline
Unified recovery processing.Eliminating the environment of the conventional outdoor open system of coal chemical industry tar separation influences.
In the tar separator of the present invention, tar and coal dust in fluorine-containing gas liquor are precipitated in separator bottom, are led to
Electric scraper is crossed tar and coal dust are expelled to tar cinder field from bottom or in line transported outward to the tar slag car.
Fluorine-containing gas liquor carries out air supporting process processing in the present invention, is pressurizeed to fluorine-containing gas liquor using gas-liquid multiphase air dissolved pump
Molten gas technology, directly generates microbubble, and compare conventional process flow, reduces water circulating pump, air compressor machine, dissolving etc.
Device configuration greatly reduces equipment investment, floor space and day-to-day operation maintenance cost.
Before fluorine-containing gas liquor carries out air supporting process processing in the present invention, addition is needed using the flocculant being centainly formulated and is mixed
Solidifying agent, can destroy the double electrical layers of oil reservoir, realize that fine demulsification, collaboration air-floating apparatus generate a large amount of microbubbles
Under collective effect, combines and deoil and suspended matter removal efficiency is up to 95% or more.
Fluorine-containing gas liquor carries out air-float filtration process processing in the present invention.Air supporting mode uses partial reflux formula pressure air-dissolving
Air supporting mode, reflux ratio are（20-40）%, compare conventional sewage whole pressing technology energy saving 50% or more；Partial reflux is adopted
Phenomena such as to be clear liquid after flotation can effectively prevent sewage pipeline block, build the pressure, ensures the flat of sewage disposal system
Steady operation, partial reflux can greatly increase the utilization ratio of air supporting flocculant and coagulant, can reduce consumption medicament（20-
30）%.
Fluorine-containing gas liquor is filtered process processing in the present invention, using adsorptivity and the double medium filler filtering dresses of filterability
Set the removing completed to the impurity such as oil and coal dust in gas liquor.Coal dust after double medium filler filter devices run one period
Dirt and oil etc. are intended to imurity-removal and are gradually accumulated on filter medium, and filtering layer gap is gradually blocked by impurity, and filter device pressure difference increases
Add, it can be by on-line automatic/manual switching to on-line cleaning step for regeneration, to ensure that double medium filler filter devices restore just
Normal working performance, continuous and steady operation.Wherein, when medium filler by it is lower and it is upper respectively be filtering layer of sand and filtering coke layer, mistake
Filter sand layer can be simple filter sand, can also be that filter sand and support stone positioned at filter sand bottom are molecular.
Precipitation and sludge concentration tank are the precipitation with inclined tube module+sludge condensation cell system in the present invention：The system will sink
It forms sediment separation and two functions of sludge condensation combines in a pond, detached alumen ustum and water using inclined tube module, reverse flow is by water and alumen ustum
Sludge settling detaches, and improves deposition efficiency, reduces sedimentation basin scale, reduces floor space, and by precipitation concentration and sludge
Return integrated combination design, keeps sludge structure fine and close, does not need independent sludge concentration tank, not only reduce floor space, but also
The energy is saved.
The top alumen ustum precipitating sludge of precipitation and sludge condensation bottom of pond is configured to be continuously circulated to flocculation basin in the present invention
On the one hand reuse, such setting precipitate a large amount of particle in alumen ustum using activity and provide condensation nucleus for fluorine-containing coal gas water flocculation
The heart further enhances flocculation reaction process, and on the other hand, the activated sludge that the alumen ustum through precipitation is formed that flows back has comparable connect
Flocculation activity is touched, the efficiency of medicament is improved, effectively reduces the consumption of medicament.
Precipitation and sludge concentration tank underlying layers are deposited on the sludge in bottom of pond portion by means of equipped with pointed stake fence in the present invention
For mud scraper system to promote sludge condensation effect, the reachable concentration of thickened sludge is 20 ~ 200g/L.
Setting mud position survey meter in sludge settling concentration basin in the present invention, by mud discharging pump, periodically by excess sludge
Extraction is sent to biochemical treatment apparatus, controls the sludge quantity in pond.
Coagulant, flocculant will be added in water again using industry water after liquid polymers on-line dilution in the present invention,
Design adds concentration and is determined by live Beaker Test, and the dosage of polymer is adjusted in proportion according to the measured value of flow of inlet water
Section.
Blender is provided in the present invention between flocculation tank and sedimentation basin, good preliminary sedimentation is formed by mixing slowly
Shallow lake condition, alumen ustum will not destroy or generate vortex so that a large amount of alumen ustum are deposited in precipitation zone precipitation.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention without having to pay creative labor, may be used also for those of ordinary skill in the art
With obtain other attached drawings according to these attached drawings.
Fig. 1 is present invention process flow diagram.
In figure：1, flash separation device；2, air-floating apparatus；3, double medium filters；4, stripper；5, chemical precipitation pond；
6, pH regulating reservoirs；7, coagulating basin；8, flocculation basin；9, sludge settling concentration basin；10, edible vegetable oil separator；11, force (forcing) pump is stripped；
12,1# gas liquors force (forcing) pump；13,2# gas liquors force (forcing) pump；14, milk of lime preparation vessel；15, calcium chloride preparation vessel.
A:Quick lime；B:Calcium chloride；C:Sulfuric acid；D:Coagulant；E:Flocculant；F:Middle pressure steam.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without creative efforts
Embodiment shall fall within the protection scope of the present invention.
The system that deep purifying as shown in Figure 1 handles fluorine-containing gas liquor, including：Flash separation device 1 is waited for for receiving
The fluorine-containing high pressure coal air water of processing, and the escaping gas, tar and coal dust of dissolving therein are separated off；Air-floating apparatus
2, the water inlet of the air-floating apparatus 2 is connected to the water outlet of flash separation device 1, for further removing edible vegetable oil in gas liquor
And suspended matter；The water inlet of double medium filters 3, double medium filters 3 is connected to the water outlet of air-floating apparatus 2, is used for
By oil and the further removing purification that suspends, obtains oil content and be less than (15-20) mg/L, suspended matter is less than the coal of (25-30) mg/L
Air water；Stripper 4, the stripper 4 are equipped with water inlet, water outlet, middle pressure steam import and gas stripping gas outlet, the stripping
The water inlet of tower 4 is connected to the water outlet of double medium filters 3；Chemical precipitation pond 5, the chemical precipitation pond 5 are equipped with water inlet
The water inlet of mouth, water outlet, lime milk intlet, calcium chloride import, the chemical precipitation pond 5 is connected to the water outlet of stripper 4,
The water outlet in the chemical settling pond 5 is connected to the water inlet of pH regulating reservoirs 6；The lime milk intlet in the chemical precipitation pond 5 with
The discharge port of milk of lime preparation vessel 14 is connected to, and quick lime feed inlet and water inlet are equipped on the milk of lime preparation vessel 14；
The calcium chloride import in the chemical precipitation pond 5 is connected to the discharge port of calcium chloride preparation vessel 15, and in the calcium chloride preparation vessel
15 are equipped with calcium chloride feed inlet and water inlet；Coagulating basin 7, the water inlet of the coagulating basin 7 connect with the water outlet of pH regulating reservoirs 6
It is logical, the small flco of generation is reacted with coagulant for the gas liquor that pH value is 5-9 to be delivered to coagulating basin 6；It is equipped in flocculation basin 8
The water inlet of agitating device, flocculant concentration ring and deflector, the flocculation basin 8 is connected to the water outlet of coagulating basin 7, for making
Small flco is condensed into large stretch of flco with flocculant；Sludge settling concentration basin 9, the sludge settling concentration basin 9 are equipped with water inlet
Mouth, sludge outlet, qualified production water out, the water inlet of the sludge settling concentration basin 9 are connected to the water outlet of flocculation basin 8, institute
State the qualified production water out of sludge settling concentration basin 9 respectively with the water inlet and calcium chloride preparation vessel of the milk of lime preparation vessel 14
Water inlet connection on 15.
High pressure coal air water from coal gas 70t/h and from shift conversion step 10t/h is sent to after heat recovery to be built-in with
The flash separation device 1 of tar separator is handled, and the impurity such as the escaping gas dissolved in gas liquor, tar and coal dust is made to obtain
To being sufficiently separated；After gas liquor from coal gas cooling and low temperature washing device for methanol is sent to the separation light oil of edible vegetable oil separator 10,
The gas liquor that tar and coal dust separation are completed with flash separation device 1 enters air-floating apparatus 2 together, and air-floating apparatus 2 purifies
For the removal rate of oil and suspended matter up to 90% or more, oil and suspended matter are separated and discharged system after processing, obtain gas liquor and are situated between by double
The impurity such as mass filter 3 further separation removal oil and suspended matter, by the oil in treated the gas liquor of double medium filters 3
Content is less than 20mg/L, and suspended matter is less than 30mg/L；Then after stripping force (forcing) pump 11 pressurizes, most of gas liquor is sent to
4 further purified treatment of stripper is less than 100g/L by the ammonia nitrogen in treated the gas liquor of stripper 4, and stripping gas is sent to
Lurgi pressure gasifier makees gasifying agent, and the ammonia in stripping gas is decomposed into nitrogen in gasification furnace high temperature；Then it will be completed pre- net
Changing treated, fluorine-containing gas liquor is sent into chemical precipitation pond 5, sequentially adds liquid milk of lime and calcium chloride respectively, first throws
It is reacted after adding milk of lime, right milk of lime to be thoroughly mixed with waste water and generates calcirm-fluoride, after removing most of fluorine ion；Then on it
Calcium chloride is added in clear liquid, supplements calcium ion, so that the fluorine ion in gas liquor is reacted and is generated fluoride precipitation, and depth reduces trip
It, need to be in pH regulating reservoirs 6 to ensure that gas liquor is good in coagulating basin 7, the purification removal effect of flocculation basin 8 after amorph content of fluoride ion
The pH value that sulfuric acid adjusts gas liquor is added, then gas liquor enters coagulating basin 7 and dosing coagulant.Gas liquor after treatment
Flocculation basin 8 is introduced, is provided with agitating device in flocculation basin 8, flocculant concentration ring, steel reative cell and deflector pass through turbine
Stirring makes polymer and gas liquor be sufficiently mixed and provides the progress that the energy needed for polyeletrolyte is more advantageous to reaction.Pass through
Flocculant is added, using its high molecular weight, long chain and charge character have the effects that net catches, builds bridge, and will pass through coagulation
Pond 7 generates the small flco formed and is condensed into large stretch of flco, accelerated sedimentation separation.In addition, due to passing through 7 purified treatment of coagulating basin
Afterwards, water turbidity substantially reduces, and agglomerates the reduction of core, weakens flocculation process, to further enhance gas liquor in flocculation basin 8
Purification reaction effect, take by sludge settling concentration basin 9 generation alumen ustum precipitating sludge carry out being partly refluxed to arranging for flocculation basin 8
It applies, the purification that gas liquor in flocculation basin 8 is enhanced by the injection of above-mentioned while input flocculant and returned sludge removes effect
Fruit；Last gas liquor enters sludge settling concentration basin 9：Qualification production water is divided with alumen ustum sludge settling using the reverse flow of inclined tube module
From.A qualification production water part is sent to milk of lime preparation vessel 14, the configuration milk of lime of calcium chloride preparation vessel 15 and calcium chloride and uses water
It uses；Return system is as recirculated cooling water, boiler feedwater after a part of qualified production water is sent to the refined reuse process processing of waste water
It recycles, reduces the fresh water consumption of enterprise and the discharge capacity of waste water.9 bottom alumen ustum sludge settling of sludge settling concentration basin
Divide two layers, upper part alumen ustum precipitating sludge is continuously circulated to 8 reuse of flocculation basin.Lower layer be deposited on the sludge of pond bottom by
In equipped with the mud scraper system of pointed stake fence, to promote concentrated effect, mud position survey meter is set in sludge settling concentration basin, is passed through
Mud discharging pump periodically extracts excess sludge out, is sent to biochemical device processing.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
With within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention god.
Claims (9)
1. the technique that a kind of deep purifying handles fluorine-containing gas liquor, it is characterised in that：The pending fluorine-containing gas liquor of high pressure is first
Make the escaping gas dissolved in gas liquor, tar and coal dust separation through vacuum flashing boiling and tar separation, is returned through part
After stream pressurized dissolved air flotation further removes edible vegetable oil and suspended matter, oil content is obtained by filtration into double medium filters and is less than (15-
20) mg/L, suspended matter are less than the fluorine-containing gas liquor of (25-30) mg/L, calm the anger during filtered fluorine-containing gas liquor pressurization is carried out
It carries, the fluorine-containing gas liquor after air lift is delivered to chemical precipitation pond, milk of lime is first launched into chemical settling pond, then to change
It learns settling tank supernatant layer and adds calcium chloride solution, obtain fluorinion concentration and be less than（5~10）The gas liquor of mg/L, then by coal
Air water send to pH regulating reservoirs and is added after pH value is adjusted to 5-9 by pH adjusting agent, and into coagulating basin and coagulant is added, then introduces
Flocculation basin simultaneously makes flocculant and gas liquor be thoroughly mixed to form big alumen ustum by stirring, subsequently into sludge settling concentration basin,
Qualification production water is detached with alumen ustum sludge settling using the reverse flow of inclined tube module, and by a part of qualified water that produces for preparing lime
Breast and calcium chloride solution.
2. the technique that deep purifying as described in claim 1 handles fluorine-containing gas liquor, it is characterised in that：In sludge settling concentration basin
The part alumen ustum sludge settling separated is back to flocculation basin.
3. the technique that deep purifying as described in claim 1 handles fluorine-containing gas liquor, it is characterised in that：Partial reflux pressure air-dissolving
Reflux ratio in air supporting is（20-40）%.
4. the technique that deep purifying as described in claim 1 handles fluorine-containing gas liquor, it is characterised in that：Add by partial reflux
Before pressure solution gas air-flotation process, flocculant and coagulant are added into fluorine-containing gas liquor.
5. the technique that deep purifying as described in claim 1 handles fluorine-containing gas liquor, it is characterised in that：Pending high pressure is fluorine-containing
Gas liquor is first to make the coal gas that tar and coal dust detach through vacuum flashing boiling by what coal gas and/or shift conversion step generated
Water cools down and/or becomes what the gas liquor that low-temp methanol is washed after generating and detaching edible vegetable oil converged with by coal gas.
6. the system that a kind of deep purifying handles fluorine-containing gas liquor, it is characterised in that including：
Flash separation device, for receiving pending fluorine-containing high pressure coal air water, and by the escaping gas wherein dissolved, tar
And coal dust is separated off；
The water inlet of air-floating apparatus, the air-floating apparatus is connected to the water outlet of flash separation device, for further removing coal
Edible vegetable oil and suspended matter in air water；
Filter device, the water inlet of the filter device are connected to the water outlet of air-floating apparatus, for oil and suspension is further
Removing purification obtains oil content and is less than (15-20) mg/L, and suspended matter is less than the gas liquor of (25-30) mg/L；
Stripper plant, the stripper plant are equipped with water inlet, water outlet, middle pressure steam import and gas stripping gas outlet, the vapour
The water inlet for carrying device is connected to the water outlet of filter device；
Chemical precipitation pond, the chemical precipitation pond are equipped with water inlet, water outlet, lime milk intlet, calcium chloride import, describedization
The water inlet for learning sedimentation basin is connected to the water outlet of stripper plant, the water inlet of the water outlet and pH regulating reservoirs in the chemical settling pond
Mouth connection；The lime milk intlet in the chemical precipitation pond is connected to the discharge port of milk of lime preparation vessel, and in the milk of lime system
Standby slot is equipped with quick lime feed inlet and water inlet；The discharging of the calcium chloride import and calcium chloride preparation vessel in the chemical precipitation pond
Mouth connection, and calcium chloride feed inlet and water inlet are equipped on the calcium chloride preparation vessel；
The water inlet of coagulating basin, the coagulating basin is connected to the water outlet of pH regulating reservoirs, for pH value is defeated for the gas liquor of 5-9
It send to coagulating basin to react with coagulant and generates small flco；
Flocculation basin, the water inlet of the flocculation basin are connected to the water outlet of coagulating basin, for making small flco be agglomerated with flocculant
At large stretch of flco；
Sludge settling concentration basin, the sludge settling concentration basin is equipped with water inlet, sludge outlet, qualified production water out, described
The water inlet of sludge settling concentration basin is connected to the water outlet of flocculation basin.
7. the system that deep purifying as claimed in claim 6 handles fluorine-containing gas liquor, it is characterised in that：The sludge settling concentration
The qualified production water out in pond is connected to the water inlet on the water inlet and calcium chloride preparation vessel of the milk of lime preparation vessel respectively.
8. the system that deep purifying as claimed in claim 6 handles fluorine-containing gas liquor, it is characterised in that：It is equipped in the flocculation basin
Agitating device, flocculant concentration ring and deflector.
9. the system that deep purifying as claimed in claim 6 handles fluorine-containing gas liquor, it is characterised in that：The filter device is double
Medium filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810352441.6A CN108328844A (en) | 2018-04-19 | 2018-04-19 | A kind of deep purifying handles the technique and system of fluorine-containing gas liquor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810352441.6A CN108328844A (en) | 2018-04-19 | 2018-04-19 | A kind of deep purifying handles the technique and system of fluorine-containing gas liquor |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1793291A (en) * | 2005-12-31 | 2006-06-28 | 天脊煤化工集团有限公司 | Process for treating gas water for producing gas by lurgi furnace |
| JP2006255499A (en) * | 2005-03-15 | 2006-09-28 | Kurita Water Ind Ltd | Fluorine-containing wastewater treatment method and apparatus |
| CN102976526A (en) * | 2012-12-11 | 2013-03-20 | 北京翰祺环境技术有限公司 | Forced external circulating type efficient precipitation method and equipment based on addition of lime |
| CN105152489A (en) * | 2015-09-22 | 2015-12-16 | 苏州科技学院 | Method for treatment of waste water containing fluorinions and nitrate ions |
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2018
- 2018-04-19 CN CN201810352441.6A patent/CN108328844A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006255499A (en) * | 2005-03-15 | 2006-09-28 | Kurita Water Ind Ltd | Fluorine-containing wastewater treatment method and apparatus |
| CN1793291A (en) * | 2005-12-31 | 2006-06-28 | 天脊煤化工集团有限公司 | Process for treating gas water for producing gas by lurgi furnace |
| CN102976526A (en) * | 2012-12-11 | 2013-03-20 | 北京翰祺环境技术有限公司 | Forced external circulating type efficient precipitation method and equipment based on addition of lime |
| CN105152489A (en) * | 2015-09-22 | 2015-12-16 | 苏州科技学院 | Method for treatment of waste water containing fluorinions and nitrate ions |
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