CN107522313A - A kind of processing method and processing system in coal water slurry gasification Heisui River - Google Patents
A kind of processing method and processing system in coal water slurry gasification Heisui River Download PDFInfo
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- CN107522313A CN107522313A CN201610457408.0A CN201610457408A CN107522313A CN 107522313 A CN107522313 A CN 107522313A CN 201610457408 A CN201610457408 A CN 201610457408A CN 107522313 A CN107522313 A CN 107522313A
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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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
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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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
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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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
- C02F1/4693—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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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
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/02—Softening water by precipitation of the hardness
- C02F5/06—Softening water by precipitation of the hardness using calcium compounds
Abstract
The present invention relates to water treatment field, discloses a kind of processing method and processing system in coal water slurry gasification Heisui River, and this method includes：(1) by coal water slurry gasification Heisui River and Ca (OH)2Solution contacts；(2) product for obtaining step (1) contacts with flocculant carries out flocculation sediment, obtains sediment and supernatant；(3) supernatant and CO for obtaining step (2)2Contact；(4) suspension and/or colloid in the product that removal step (3) obtains；(5) the dissolvable mine material ion in the product that removal step (4) obtains.Buck harmful ion such as Cl can effectively be removed using the method for the present invention‑、Ca2+、Mg2+, increase the reclamation rate of buck, reduce row and Sewage Disposal operating cost and investment outside buck.
Description
Technical field
The present invention relates to water treatment field, in particular it relates to a kind of processing method in coal water slurry gasification Heisui River
And processing system.
Background technology
Coal water slurry gasification technology is that Texaco Petroleum Maatschappij (Netherland) B.V of the U.S. grows up on the basis of heavy oil gasification
Second generation coal gasifying process in the world, in input industrialized production twentieth century eighties, through more than half
The operation in individual more centuries, coal water slurry gasification technology all have accumulated abundant design and operation warp in all fields
Test.
In coal-water slurry gasification, pulp water treatment technology is part important in whole technique, main
To include from gasification furnace and scrubbing tower discharge Heisui River, Heisui River by technique shapes such as multistage flash evaporation-flocculating settings
Into buck, system reuse after the grey water deoxygenation in part.
Although coal-water slurry gasification heavy industrialization, and running steadily in the long term, at pulp water
Reason system is but perfect not to the utmost.Coal water slurry gasification buck complicated component, high COD, high ammonia nitrogen, water quality,
Displacement fluctuation range is big, in addition, buck calcium ions and magnesium ions content is high and temporary hardness is big, ash water recycling and
Pipeline and underwater installation fouling are easily caused during sewage disposal, influences coal water slurry gasification system and sewage disposal
The even running of apparatus system, and the harmful ion chlorion contained in buck can cause pipeline and equipment rotten
Erosion, at present can only be by arranging supplement fresh water to keep the system stable operation (benefit of fresh water outside increase buck
Charge is generally system always 20-30% of grey water or so, and the water of outer ash discharge water accounts for whole coal chemical industry
50% or so of factory's water treatment station water), in order to reduce follow-up sewage disposal burden and realize industry energy conservation
Consumption reduction, grey water handling reclamation technology need to be developed and realize energy-saving and emission-reduction with technique.
Patent application CN104230010A discloses a kind of softening of the coal gasification buck of high temporary hardness
Method, it is directed to the characteristics of coal water slurry gasification buck temporary hardness is high, and NaOH is added into buck one
Determine to react a period of time at temperature so that calcium ions and magnesium ions are converted into calcium carbonate in buck and magnesium hydroxide sinks
Form sediment, sediment removes through stopping sedimentation, and supernatant hardness reduces.The inventive method for temporary hardness compared with
High waste water has certain emollescence really, but applied to for coal water slurry gasification commercial plant, has
There is certain implementation limitation：(1) when gasification furnace cuts stove and operating condition changes, buck water quality
Index fluctuation range is big, thus temporary hardness value is unstable, therefore it is uncontrollable to add NaOH amounts；(2)
NaOH is added in buck, Na is have also been introduced in system while hardness reduces+Ion, after adding
Continuous water process burden；(3) NaOH medicaments industrial application price costly, passes through without industrial implementation
Ji property.
Patent application CN202988849U discloses a kind of coal water slurry gasification that reduces and concentrates Heisui River hardness
System, specifically disclose：Na is added into subsider outlet conduit2CO3Solution, formed black after precipitating
Water filters by filter, and filtrate buck return system recycles, and reaching reduces hardness effect.This is special
Though profit application can reduce Ca to a certain extent in theory2+Concentration, but limitation embody it is as follows：Filtering
CaCO of the machine to formation3It is limited to precipitate filtration, substantial amounts of CaCO3Still it is suspended in buck,
Cause the fouling of rear system；It has ignored the influence to ash water recycling, such as Cl after other ion enrichments-。
The content of the invention
The invention aims to overcome drawbacks described above of the prior art, there is provided a kind of coal water slurry gasification
The processing method and processing system in Heisui River, buck harmful ion can effectively be removed using the method for the present invention
Such as Cl-、Ca2+、Mg2+, increase the reclamation rate of buck, reduce arranged outside buck and Sewage Disposal operation into
Sheet and investment.
To achieve these goals, in a first aspect, the invention provides a kind of place in coal water slurry gasification Heisui River
Reason method, this method include：
(1) by coal water slurry gasification Heisui River and Ca (OH)2Solution contacts；
(2) product for obtaining step (1) contacts with flocculant carries out flocculation sediment, obtains sediment
And supernatant；
(3) supernatant and CO for obtaining step (2)2Contact；
(4) suspension and/or colloid in the product that removal step (3) obtains；
(5) the dissolvable mine material ion in the product that removal step (4) obtains.
Second aspect, the invention provides a kind of processing system in coal water slurry gasification Heisui River, the system includes：
Chemicals dosing plant, reaction tank, flocculation sedimentation tank, CO2Aeration tank, suspension and/or colloid removal device and
Dissolvable mine material ion remaval device,
The chemicals dosing plant includes lime chemicals dosing plant and flocculant chemicals dosing plant, is respectively used to reaction tank
With offer Ca (OH) in flocculation sedimentation tank2Solution and flocculant,
The reaction tank is used for the Ca (OH) for providing coal water slurry gasification Heisui River and the lime chemicals dosing plant2
Solution contacts；
The flocculation sedimentation tank is used for the product from the reaction tank and the flocculant chemicals dosing plant
The flocculant of offer is contacted to carry out flocculation sediment, obtains sediment and supernatant；
The CO2Aeration tank is used for supernatant and CO from the flocculation sedimentation tank2Contact；
Suspension and/or the colloid removal device, which is used to remove, comes from the CO2In the product of aeration tank
Suspension and/or colloid；
The dissolvable mine material ion remaval device is used to remove to be gone from the suspension and/or colloid
Except the dissolvable mine material ion in the product of device, to obtain that the ash of coal water slurry gasification system can be back to
Water.
Buck harmful ion such as Cl can effectively be removed using the method and system of the present invention-、Ca2+、Mg2+,
Increase the reclamation rate of buck, reduce the outer discharge capacity of buck and supplement fresh water amount, save energy consumption, reduce sewage
Treating stations operating cost and investment.Wherein, method of the invention is suitable for coal slurry gasifier ature of coal and fortune
Change of water quality caused by row working conditions change, CaO (i.e. Ca (OH) are added by controlling2) and be passed through CO2
Amount, using pH value formed closed-loop control, moreover, processing producing water water quality need to only meet coal water slurry gasification
Quality of reused water requirement, obtain technique production water can direct reuse in ash water system.Meanwhile it is not required to
Change coal water slurry gasification existing process and device layout, be easy to existing transformation and upgrading.
The method of the present invention, changes direct outer ash discharge water in original coal water slurry gasification usage on black water method
The defects of being recycled with supplement fresh water to ensure the balance of suspension and other harmful ions in buck,
According to a kind of preferred embodiment, the inventive method is directly removed harmful using medical method and electroosmose process
Ion, ash water recycling system ionic equilibrium is maintained, while also converted using coal plant's such as synthesis gas single
The CO of member2Waste gas, pH value is adjusted, precipitate unnecessary Ca in buck2+Deng.
In the method for the present invention, Ca (OH) is added2It is relatively low compared with other modes cost to reduce the mode of hardness,
And CO2For coal plant outer waste air without fringe cost, in a preferred embodiment, this hair
Bright method makes full use of the characteristics of coal water slurry gasification Heisui River temporary hardness height and big variation water quality scope, will
Two steps combine, and first add Ca (OH)2Solution adjusts pH value to 10-12, CaCO3With
Mg(OH)2Precipitation is formed, then is passed through CO2Precipitate excessive Ca (OH)2, pH value is adjusted to 7-8,
After reducing hardness and flocculation sediment, water outlet enters electrodialysis plant after being pre-processed by micro-filtration and removed
Cl-, further remove Ca2+、Mg2+With other positive and negative ions, water outlet reaches gasification system recycle-water will
Ask.That is, by a whole set of technique of the inventive method, suspension, the Ca in Heisui River can effectively be removed2+、
Mg2+And Cl-The several key parameters that need to be controlled Deng ash water recycling, it is a large amount of to reduce outer ash discharge water, increase ash
The reuse of water, while the supply of whole coal-water slurry gasification fresh water is reduced, arranged using coal chemical industry factory
The CO put2Waste gas, emission reduction purpose is realized, there is important economic benefit and social benefit.
Other features and advantages of the present invention will be described in detail in subsequent specific embodiment part.
Brief description of the drawings
Fig. 1 is the process chart of the method for the present invention.
Embodiment
The embodiment of the present invention is described in detail below.It should be appreciated that this place is retouched
The embodiment stated is merely to illustrate and explain the present invention, and is not intended to limit the invention.
The end points of disclosed scope and any value are not limited to the accurate scope or value herein, this
A little scopes or value should be understood to comprising the value close to these scopes or value.For number range, respectively
Between the endpoint value of individual scope, between the endpoint value of each scope and single point value, and single point
Can be combined with each other between value and obtain one or more new number ranges, these number ranges should by regarding
For specific disclosure herein.
In a first aspect, the invention provides a kind of processing method in coal water slurry gasification Heisui River, this method includes：
(1) by coal water slurry gasification Heisui River and Ca (OH)2Solution contacts；
(2) product for obtaining step (1) contacts with flocculant carries out flocculation sediment, obtains sediment
And supernatant；
(3) supernatant and CO for obtaining step (2)2Contact；
(4) suspension and/or colloid in the product that removal step (3) obtains；
(5) the dissolvable mine material ion in the product that removal step (4) obtains.
In the method for the present invention, in step (1), it will be understood by those skilled in the art that water coal
Slurry gasification Heisui River and excessive Ca (OH)2Solution contacts, excessive Ca (OH)2For removing water-coal-slurry gas
Change the temporary hardness HCO in Heisui River3 -Ion, and finally remove in solution and easily cause scaling
Ca2+And Mg2+, and the excessive Ca added2+CO is passed through by subsequent step2Remove." excess " is phase
For the HCO in coal water slurry gasification Heisui River3 -For ion.
In the method for the present invention, in step (1), the reaction of generation is specific as follows：
Temporary hardness is removed, makes Ca2+And Mg2+Form precipitation：
Mg(HCO3)2+2Ca(OH)2=Mg (OH)2+2CaCO3+2H2O (1)
Ca(HCO3)2+Ca(OH)2=2CaCO3+2H2O (2)
Remove non-carbonate hardness：
MgCl2+Ca(OH)2=Mg (OH)2+CaCl2 (3)
MgSO4+Ca(OH)2=Mg (OH)2+CaSO4 (4)
As above, method of the invention, using coal water slurry gasification Heisui River temporary hardness it is high the characteristics of, in Heisui River
Middle addition Ca (OH)2Solution, in theory 1 mole of Ca (OH)22 moles of OH can be produced-, and 2 moles
HCO3 -Reaction, generate 2 moles of CO3 2-, such as the sufficiently high addition of coal water slurry gasification Heisui River temporary hardness
Ca2+Also can precipitate.
In the case of process of the present invention it is preferred, in step (1), the condition of contact includes：Ca(OH)2
The dosage of solution make it that the pH for the product that step (1) obtains is 10-12, preferably 11-12；Water coal
Slurry gasification Heisui River and Ca (OH)2The time of solution contact is 0.5-3h, preferably 0.5-1h.It is further excellent
Selection of land, the condition of contact also include：Temperature is 10-40 DEG C, Ca (OH)2The concentration of solution is
5wt%-10wt%.
In the method for the present invention, in step (2), it will be understood by those skilled in the art that step
(1) in the product obtained, CaCO3With Mg (OH)2To be insoluble in the material of water, most of is in colloid
State can not form bulky grain, be contacted with flocculant after carrying out flocculation sediment, can form bulky grain precipitation,
Clarified Heisui River, the precipitation and suspension and colloid of generation enter original work after flocculation sediment together
Skill sludge treating system.
In the case of process of the present invention it is preferred, in step (2), product that step (1) obtains with
The time of flocculant contact is 0.5-3h, more preferably 0.5-1h.
Preferably, flocculant is PAM (polyacrylamide) cationic flocculant, it is further preferred that
The product obtained equivalent to step per ton (1), the dosage of the flocculant is 2-5g, further excellent
Elect 2-3g as.
The present invention method in, coal water slurry gasification system water quality due to operating condition or cut stove operation etc. because
Element, water quality is highly unstable, as temporary hardness is less than Ca in former Heisui River2+Concentration, due to adding Ca (OH)2
Solution can introducing portion Ca2+, in step (3) with CO2Contact, can precipitate unnecessary Ca2+, again
The pH value of buck can be adjusted, meets follow up device and reuse requirement.
In the case of process of the present invention it is preferred, in step (3), the condition of the contact includes：
CO2Dosage make it that the pH of product that step (3) obtains is 7-8.It is further preferred that contact
Condition also includes：Time is 5-10min, and temperature is 10-40 DEG C.
It is outstanding in the product obtained for removal step (3) in step (4) in the method for the present invention
Float and/or the method for colloid are not particularly limited, as long as can be in the obtained product of removal step (3)
Suspension and/or colloid, under preferable case, the suspension in the product that removal step (3) obtains
The method of thing and/or colloid includes：The product that step (3) is obtained carries out micro-filtration or sand filtration, further
Preferably micro-filtration.It is further preferred that the condition of the micro-filtration includes：The aperture of miillpore filter is
2-5 μm, and the pressure applied on miillpore filter is 0.1-0.2MPa.
In the case of process of the present invention it is preferred, this method also includes：Before step (4) is carried out,
The product that first step (3) is obtained contacts with flocculant carries out precipitation process, obtains sediment and supernatant
Liquid, then gained supernatant is carried out to the operation of step (4).The selection of contact conditions and flocculant is same
Step (2), will not be repeated here.
The present invention method in, in step (5), in the product obtained for removal step (4) can
There is no particular limitation for the method for insoluble minerals ion, as long as being capable of the obtained production of removal step (4)
Dissolvable mine material ion in thing, under preferable case, in the product that removal step (4) obtains
The method of dissolvable mine material ion include：Electricity is carried out using the product that step (4) obtains as water inlet
Dialysis processing or Electro Sorb processing, more preferably electrodialysis process.
Preferably, the dissolvable mine material ion includes Cl-、Na+、K+And SO4 2-；Wherein, Cl-
Stainless steel equipment and pipeline can be caused to corrode, Na+、K+And SO4 2-For the negative and positive that other are easily enriched with from
Son.
Preferably, the condition of the electrodialysis process includes：The electrical conductivity of control electrodialysis water outlet is no more than
Enter the 40% of water conductivity, the electrical conductivity for further preferably controlling electrodialysis water outlet is into water conductivity
25-40%.
In the case of process of the present invention it is preferred, this method also includes：By step (1), (2), (4)
And the sediment that optional precipitation process obtains carries out sludge dewatering treatment.
In the case of process of the present invention it is preferred, step (5) obtains that coal water slurry gasification system can be back to
The buck of system, this method also include：The ash water recycling that step (5) is obtained is in coal water slurry gasification system.
I.e. electrodialysis water outlet is supplied to sewage disposal list as buck or process system production Water circulation, electrodialysis concentrated water
Member is handled.
In the case of process of the present invention it is preferred, the pH value in the coal water slurry gasification Heisui River is 8-9,
Temporary hardness is 500-1200mg/L, Ca2+Concentration is 200-500mg/L, Mg2+Concentration is 10-20mg/L,
Cl-Concentration is 100-200mg/L, COD 500-1200mg/L.
In the method for the present invention, the buck that step (5) obtains meets circulation buck water quality requirement, its water
Matter is specifically shown in Table 1.
Table 1
Second aspect, the invention provides a kind of processing system in coal water slurry gasification Heisui River, the system includes：
Chemicals dosing plant, reaction tank, flocculation sedimentation tank, CO2Aeration tank, suspension and/or colloid remove
Device and dissolvable mine material ion remaval device,
The chemicals dosing plant includes lime chemicals dosing plant and flocculant chemicals dosing plant, is respectively used to reaction tank
With offer Ca (OH) in flocculation sedimentation tank2Solution and flocculant,
The reaction tank is used for the Ca (OH) for providing coal water slurry gasification Heisui River and the lime chemicals dosing plant2
Solution contacts；
The flocculation sedimentation tank is used for the product from the reaction tank and the flocculant chemicals dosing plant
The flocculant of offer is contacted to carry out flocculation sediment, obtains sediment and supernatant；
The CO2Aeration tank is used for supernatant and CO from the flocculation sedimentation tank2Contact；
Suspension and/or the colloid removal device, which is used to remove, comes from the CO2In the product of aeration tank
Suspension and/or colloid；
The dissolvable mine material ion remaval device is used to remove to be gone from the suspension and/or colloid
Except the dissolvable mine material ion in the product of device, to obtain that the ash of coal water slurry gasification system can be back to
Water.
In the system of the present invention, under preferable case, suspension and/or the colloid removal device is micro-filtration
Device or sand filtering device, more preferably micro-filtration.
In the system of the present invention, under preferable case, the dissolvable mine material ion remaval device is electric osmose
Analysis apparatus or electric adsorption device, more preferably electrodialysis plant.
In the system of the present invention, under preferable case, the system also includes settler, for that will come from institute
State CO2The product of aeration tank contacts with the flocculant that flocculant chemicals dosing plant provides carries out precipitation process, with
Sediment and supernatant are obtained, then supplies gained supernatant to suspension and/or colloid removal device.
The present invention system in, under preferable case, the lime chemicals dosing plant include lime feedway,
Ca(OH)2Solution preparation device, Ca (OH)2Solution measures device and Ca (OH)2Solution conveying device.
In the system of the present invention, under preferable case, the flocculant chemicals dosing plant includes flocculant supply dress
Put, flocculant solution device for formulating, flocculant solution metering device and flocculant solution conveying device.
In the system of the present invention, under preferable case, the system also includes sludge dehydration device, in the future
Autoreaction pond, flocculation sedimentation tank, suspension and/or colloid removal device and optional settler it is heavy
Starch carries out sludge dewatering treatment.
In the system of the present invention, each device is device commonly used in the art, and this is those skilled in the art
It is known, it will not be repeated here.
Embodiment
The present invention will be described in detail by way of examples below.In following examples, such as nothing is especially said
Bright, method therefor is the conventional method of this area.
In embodiments using coal water slurry gasification vacuum flashing lower end Heisui River as research object, its water quality is specific
It is shown in Table 2.
Table 2
Embodiment 1
(1) it is 10wt%'s by coal water slurry gasification vacuum flashing lower end Heisui River and concentration in reaction tank
Ca(OH)2Solution carries out mixing contact, and the temperature for controlling product of contact is 25 DEG C, pH 11.5, is connect
It is 50min to touch the time；
(2) product for obtaining step (1) in flocculation sedimentation tank and flocculant (PAM cations
Flocculant, purchased from Tianjin Chemical Research ＆ Desing Inst, trade mark TS-C, similarly hereinafter) 40min is contacted at 25 DEG C
Flocculation sediment is carried out, obtains sediment and supernatant, sludge dehydration device will be drained into outside sediment, wherein,
The product obtained equivalent to step per ton (1), the dosage of the flocculant is 2.5g；
The supernatant for obtaining step (2) at (3) 25 DEG C is in CO2In aeration tank with CO2Contact, control
CO processed2Dosage cause product of contact pH be 7.5, time of contact 8min；
(4) product that step (3) obtains is contacted into 30min with PAM cationic flocculants at 25 DEG C
Flocculation sediment is carried out, obtains sediment and supernatant, wherein, obtained equivalent to step per ton (3)
Product, the dosage of the flocculant is 2.5g；
(5) product that step (4) obtains is subjected to micro-filtration in micro-filtration, controls the condition of micro-filtration
Including：The aperture of miillpore filter is 3 μm, and the pressure applied on miillpore filter is 0.15MPa；
(6) electrodialysis process is carried out in electrodialysis plant using the product that step (5) obtains as water inlet,
The electrical conductivity for controlling electrodialysis water outlet is into the 30% of water conductivity, obtains electrodialysis water outlet and electrodialysis is dense
Water, by electrodialysis effluent reuse in coal water slurry gasification system, wherein, the water quality such as table 3 of electrodialysis water outlet
It is shown, meet the reuse requirement of buck in coal water slurry gasification system.
Table 3
300L/h Heisui River drop experiment of hardness device continuously runs 200h, the typically outer ash discharge water of prior art
For 200t/h, after the above-mentioned processing of the present embodiment, can the direct outer ash discharge water more than 60% of emission reduction, often
Year directly reduces fresh 1,000,000 tons of water consumption, is also greatly reduced public work water treatment facilities in addition
The expense such as investment and operation.
Embodiment 2
(1) it is 8wt%'s by coal water slurry gasification vacuum flashing lower end Heisui River and concentration in reaction tank
Ca(OH)2Solution carries out mixing contact, and the temperature for controlling product of contact is 20 DEG C, pH 12, contact
Time is 35min；
(2) product for obtaining step (1) in flocculation sedimentation tank exists with PAM cationic flocculants
60min is contacted at 20 DEG C and carries out flocculation sediment, obtains sediment and supernatant, dirt will be drained into outside sediment
Mud dehydration device, wherein, the product obtained equivalent to step per ton (1), the dosage of the flocculant
For 2g；
The supernatant for obtaining step (2) at (3) 20 DEG C is in CO2In aeration tank with CO2Contact, control
CO processed2Dosage cause product of contact pH be 7, time of contact 6min；
(4) product that step (3) obtains is contacted into 40min with PAM cationic flocculants at 20 DEG C
Flocculation sediment is carried out, obtains sediment and supernatant, wherein, obtained equivalent to step per ton (3)
Product, the dosage of the flocculant is 2g；
(5) product that step (4) obtains is subjected to micro-filtration in micro-filtration, controls the condition of micro-filtration
Including：The aperture of miillpore filter is 2 μm, and the pressure applied on miillpore filter is 0.1MPa；
(6) electrodialysis process is carried out in electrodialysis plant using the product that step (5) obtains as water inlet,
The electrical conductivity for controlling electrodialysis water outlet is into the 25% of water conductivity, obtains electrodialysis water outlet and electrodialysis is dense
Water, by electrodialysis effluent reuse in coal water slurry gasification system, wherein, the water quality such as table 4 of electrodialysis water outlet
It is shown, meet the reuse requirement of buck in coal water slurry gasification system.
Table 4
Embodiment 3
(1) it is 5wt%'s by coal water slurry gasification vacuum flashing lower end Heisui River and concentration in reaction tank
Ca(OH)2Solution carries out mixing contact, and the temperature for controlling product of contact is 30 DEG C, pH 10.5, is connect
It is 70min to touch the time；
(2) the product PAM cationic flocculants for obtaining step (1) in flocculation sedimentation tank are at 30 DEG C
Lower contact 30min carries out flocculation sediment, obtains sediment and supernatant, is taken off sludge is drained into outside sediment
Water installations, wherein, the product obtained equivalent to step per ton (1), the dosage of the flocculant is 3g；
The supernatant for obtaining step (2) at (3) 30 DEG C is in CO2In aeration tank with CO2Contact, control
CO processed2Dosage cause product of contact pH be 8, time of contact 10min；
(4) product that step (3) obtains is contacted into 50min with PAM cationic flocculants at 30 DEG C
Flocculation sediment is carried out, obtains sediment and supernatant, wherein, obtained equivalent to step per ton (3)
Product, the dosage of the flocculant is 3g；
(5) product that step (4) obtains is subjected to micro-filtration in micro-filtration, controls the condition of micro-filtration
Including：The aperture of miillpore filter is 5 μm, and the pressure applied on miillpore filter is 0.2MPa；
(6) electrodialysis process is carried out in electrodialysis plant using the product that step (5) obtains as water inlet,
The electrical conductivity for controlling electrodialysis water outlet is into the 40% of water conductivity, obtains electrodialysis water outlet and electrodialysis is dense
Water, by electrodialysis effluent reuse in coal water slurry gasification system, wherein, the water quality such as table 5 of electrodialysis water outlet
It is shown, meet the reuse requirement of buck in coal water slurry gasification system.
Table 5
Buck harmful ion such as Cl can effectively be removed using the method for the present invention-、Ca2+、Mg2+, increase
Add the reclamation rate of buck, reduce row and Sewage Disposal operating cost and investment outside buck.
The preferred embodiment of the present invention described in detail above, still, the present invention are not limited to above-mentioned reality
The detail in mode is applied, can be to the technical side of the present invention in the range of the technology design of the present invention
Case carries out a variety of simple variants, and these simple variants belong to protection scope of the present invention.
It is further to note that each particular technique described in above-mentioned embodiment is special
Sign, in the case of reconcilable, can be combined by any suitable means, in order to avoid need not
The repetition wanted, the present invention no longer separately illustrate to various combinations of possible ways.
In addition, various embodiments of the present invention can be combined randomly, as long as its
Without prejudice to the thought of the present invention, it should equally be considered as content disclosed in this invention.
Claims (17)
1. a kind of processing method in coal water slurry gasification Heisui River, it is characterised in that this method includes：
(1) by coal water slurry gasification Heisui River and Ca (OH)2Solution contacts；
(2) product for obtaining step (1) contacts with flocculant carries out flocculation sediment, obtains sediment
And supernatant；
(3) supernatant and CO for obtaining step (2)2Contact；
(4) suspension and/or colloid in the product that removal step (3) obtains；
(5) the dissolvable mine material ion in the product that removal step (4) obtains.
2. the method according to claim 11, wherein, in step (1), Ca (OH)2Solution
Dosage make it that the pH for the product that step (1) obtains is 10-12, coal water slurry gasification Heisui River and Ca (OH)2
The time of solution contact is 0.5-3h.
3. according to the method for claim 1, wherein, in step (2), step (1) obtains
Time for being contacted with flocculant of product be 0.5-3h；
Preferably, the flocculant is PAM cationic flocculants, it is further preferred that equivalent to every
The product that ton step (1) obtains, the dosage of the flocculant is 2-5g.
4. the method according to claim 11, wherein, in step (3), CO2Dosage cause
The pH for the product that step (3) obtains is 7-8.
5. the method according to claim 11, wherein, in step (4), removal step (3)
The method of suspension and/or colloid in obtained product includes：The product that step (3) is obtained is carried out
Micro-filtration or sand filtration, preferably micro-filtration；
It is further preferred that the condition of the micro-filtration includes：The aperture of miillpore filter is 2-5 μm, and
The pressure applied on miillpore filter is 0.1-0.2MPa.
6. method according to claim 1 or 5, wherein, this method also includes：Walked
Suddenly before (4), the product for first obtaining step (3) contacts progress precipitation process with flocculant, obtains
Sediment and supernatant, then gained supernatant is carried out to the operation of step (4).
7. the method according to claim 11, wherein, in step (5), removal step (4)
The method of dissolvable mine material ion in obtained product includes：The product that step (4) is obtained is made
Electrodialysis process or Electro Sorb processing, preferably electrodialysis process are carried out for water inlet；
Preferably, the dissolvable mine material ion includes Cl-、Na+、K+And SO4 2-；
Preferably, the condition of the electrodialysis process includes：The electrical conductivity of control electrodialysis water outlet is no more than
Enter the 40% of water conductivity, the electrical conductivity for further preferably controlling electrodialysis water outlet is into water conductivity
25-40%.
8. the method according to claim 1 or 6, wherein, this method also includes：By step (1),
(2), the sediment that (4) and optional precipitation process obtain carries out sludge dewatering treatment.
9. according to the method for claim 1, wherein, step (5) obtains that water-coal-slurry can be back to
The buck of gasification system, this method also include：The ash water recycling that step (5) is obtained is in water-coal-slurry gas
Change system.
10. according to the method described in any one in claim 1-9, wherein, the coal water slurry gasification
The pH value in Heisui River is 8-9, temporary hardness 500-1200mg/L, Ca2+Concentration is 200-500mg/L,
Mg2+Concentration is 10-20mg/L, Cl-Concentration is 100-200mg/L, COD 500-1200mg/L.
11. a kind of processing system in coal water slurry gasification Heisui River, it is characterised in that the system includes：Dosing
Device, reaction tank, flocculation sedimentation tank, CO2Aeration tank, suspension and/or colloid removal device and solvable
Property mineral ion removal device,
The chemicals dosing plant includes lime chemicals dosing plant and flocculant chemicals dosing plant, is respectively used to reaction tank
With offer Ca (OH) in flocculation sedimentation tank2Solution and flocculant,
The reaction tank is used for the Ca (OH) for providing coal water slurry gasification Heisui River and the lime chemicals dosing plant2
Solution contacts；
The flocculation sedimentation tank is used for the product from the reaction tank and the flocculant chemicals dosing plant
The flocculant of offer is contacted to carry out flocculation sediment, obtains sediment and supernatant；
The CO2Aeration tank is used for supernatant and CO from the flocculation sedimentation tank2Contact；
Suspension and/or the colloid removal device, which is used to remove, comes from the CO2In the product of aeration tank
Suspension and/or colloid；
The dissolvable mine material ion remaval device is used to remove to be gone from the suspension and/or colloid
Except the dissolvable mine material ion in the product of device, to obtain that the ash of coal water slurry gasification system can be back to
Water.
12. system according to claim 11, wherein, the suspension and/or colloid remove dress
It is set to micro-filtration or sand filtering device, preferably micro-filtration.
13. system according to claim 11, wherein, the dissolvable mine material ion remaval
Device is electrodialysis plant or electric adsorption device, preferably electrodialysis plant.
14. system according to claim 11, wherein, the system also includes settler, uses
In the CO will be come from2The product of aeration tank contacts progress with the flocculant that flocculant chemicals dosing plant provides
Precipitation process, to obtain sediment and supernatant, then gained supernatant is supplied to suspension and/or glue
Body removal device.
15. system according to claim 11, wherein, the lime chemicals dosing plant includes lime
Feedway, Ca (OH)2Solution preparation device, Ca (OH)2Solution measures device and Ca (OH)2Solution
Conveying device.
16. system according to claim 11, wherein, the flocculant chemicals dosing plant includes wadding
Solidifying agent feeding device, flocculant solution device for formulating, flocculant solution metering device and flocculant solution are defeated
Send device.
17. the system according to claim 11 or 14, wherein, the system also includes sludge dewatering
Device, for autoreaction in future pond, flocculation sedimentation tank, suspension and/or colloid removal device and optional
Settler sediment carry out sludge dewatering treatment.
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