CN104803537B - Incineration of refuse flyash washing softening process - Google Patents
Incineration of refuse flyash washing softening process Download PDFInfo
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- CN104803537B CN104803537B CN201510236479.3A CN201510236479A CN104803537B CN 104803537 B CN104803537 B CN 104803537B CN 201510236479 A CN201510236479 A CN 201510236479A CN 104803537 B CN104803537 B CN 104803537B
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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
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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
- C02F1/003—Processes for the treatment of water whereby the filtration technique is of importance using household-type filters for producing potable water, e.g. pitchers, bottles, faucet mounted devices
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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
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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
- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
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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
- 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
- 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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
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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
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- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a kind of incineration of refuse flyash washing softening process, comprise the following steps: flying dust is the most once washed, a centrifuge dehydration is carried out after having washed, PAM solution mix homogeneously is added in isolated filtrate, then pass to first-stage centrifugal machine B and carry out secondary centrifuging dehydration, the isolated filtrate of first-stage centrifugal machine B is through hardness coarse adjustment, after heavy metals removal processes, enter decalcification centrifuge, the isolated filtrate of decalcification centrifuge carries out hardness fine setting again, precipitate the most successively, filter, regulation filtrate PH to 78, finally it is passed through MVR vaporizer, water treatment efficiency is good, stable effluent quality；The filtrate that the isolated filter cake of decalcification centrifuge is discharged with two-stage centrifugal machine A mix after together with carry out subsequent treatment, so can carry out twice washing again, chloride ion content in filter cake is made less than 0.5%, to solve the problem that chlorinity in filter cake is too high, it is ensured that Cement Quality.
Description
Technical field
The invention belongs to incineration of refuse flyash processing technology field, particularly relate to a kind of incineration of refuse flyash washing softening process.
Background technology
Utilizing cement kiln synergic processing incineration of refuse flyash project is that the flying dust collected after burning city domestic garbage carries out profit again
With, its main flow is to be washed by the flying dust of collection, washes cement baking after remaining flying dust drying, and washing produces
Waste water, after collecting, processing and reach reuse requirement, is back to flying dust washing again.
Why flying dust must carry out washing is because in flying dust containing substantial amounts of cl-If not removing it the product that can affect cement
Matter, the most only by cl-Remove, cement kiln could be utilized to be disposed.And remove the mode of high-concentration chlorine ion at present the most first
Flying dust is washed, by the chloride shift in flying dust to water lotion, is then evaporated water lotion crystallizing, but due to
Possibly together with substantial amounts of calcium and magnesium plasma while containing substantial amounts of chloride ion in water lotion so that in water, hardness reaches 20000mg/L
More than (in terms of calcium oxide), therefore before water lotion is evaporated crystallization, water lotion must be softened (going hardness) place
Reason.
Patent No. ZL201010162532.7 discloses a kind of method processing incineration of refuse flyash, and its problem existed has:
1. the mud cake of water process centrifuge abjection is directly entered drying system, owing to this partial sludge is directed to finally wash
Liquid, so chloride ion content is high in mud cake, affects Cement Quality；
2. water processes centrifuge and receives coarse adjustment and the two-part mud of fine setting, and two-part mud is once measured and is difficult to the most greatly control
System, causes partial sludge to deposit, and then blocking pipeline；
3. the sewage after coarse adjustment is directly discharged into clear water reserviors, and once sludge quantity is big, and sedimentation effect is bad, can directly result in evaporation system
System sludge quantity is excessive, causes a series of fault in production, goes out water unstable, has a strong impact on water yield.
Summary of the invention
The technical problem to be solved in the present invention is to provide that a kind of chloride ion removal effect is good, water treatment efficiency is good, the rubbish of stable water outlet
Rubbish flying ash washing softening process.
For solving above-mentioned technical problem, the present invention adopts the following technical scheme that
A kind of incineration of refuse flyash washing softening process, comprises the following steps:
(1) in flying dust, it is passed through water, and is stirred, the most once wash, after having washed, be passed through first-stage centrifugal machine A
Carry out a centrifuge dehydration, in isolated filtrate, add PAM solution mix homogeneously, then pass to first-stage centrifugal machine B
Carry out secondary centrifuging dehydration；
(2) the first-stage centrifugal isolated filter cake of machine A, B is carried out secondary washing, then pass to two-stage centrifugal machine A and be centrifuged
Dehydration, adds PAM solution mix homogeneously in isolated filtrate, then passes to two-stage centrifugal machine B and carries out secondary centrifuging and take off
Water；
(3) in the first-stage centrifugal isolated filtrate of machine B, add alkali liquor, carry out hardness coarse adjustment for the first time, in terms of CaO, by hardness
Control 400～800ppm, after carrying out heavy metals removal process, be centrifuged in entering decalcification centrifuge separating, isolated
The filtrate that filter cake is discharged with two-stage centrifugal machine A mix after together with carry out subsequent treatment；
(4) in the isolated filtrate of decalcification centrifuge, alkali liquor is added, by Hardness Control less than 50ppm；
(5) precipitate after fully reacting, then filter, regulate filtrate pH to 7～8, then pass to MVR vaporizer,
Collect evaporation condensed water；
(6) subsequent treatment is carried out together with after the precipitation of step (5) gained being mixed with the first-stage centrifugal isolated filtrate of machine A.
Incineration of refuse flyash of the present invention washing softening process, it is preferable that in step (4), the detailed process adding alkali liquor is: de-
The isolated filtrate of calcium centrifuge is introduced into the second intermediate pool, and the filtrate in the second intermediate pool is according to 20～30m3The flow of/h
Enter water stabilization reaction tank, in water stabilization reaction tank, add alkali liquor carry out hardness fine setting, Hardness Control is being less than
50ppm, uses hardness on-line computing model to monitor hardness in real time, and the hardness data according to recording adjust alkali liquor dosage,
Computing formula is as follows: (1.9A*B)/C=D,
The hardness of A: filtrate, in terms of calcium oxide, unit mg/L,
The flow of B: filtrate, unit m3/ h,
The concentration of C: alkali liquor, unit mg/L,
The flow of D: alkali liquor, unit m3/h。
Incineration of refuse flyash of the present invention washing softening process, it is preferable that in step (5), precipitates and the detailed process that filters is:
Fully first entering one-level stable regulation pond after reaction to precipitate, supernatant enters back into two-stage stabilising regulating reservoir and carries out secondary precipitation,
Supernatant after secondary precipitation carries out sand filtration and fine straining successively.
Incineration of refuse flyash of the present invention washing softening process, it is preferable that in step (2), by the two-stage centrifugal isolated filter of machine B
The two-stage centrifugal isolated filter cake of machine A, B, for once washing, is carried out three washings by liquid, enters three grades and be centrifuged after having washed
Machine A is centrifuged dehydration, cement baking after isolated filter cake drying, adds PAM solution and mix in isolated filtrate
Close uniformly, then pass to three grades of centrifuge B and carry out secondary centrifuging dehydration, cement baking after isolated filter cake drying, filtrate
Wash for secondary.
Incineration of refuse flyash of the present invention washing softening process, it is preferable that in step (3), heavy metals removal processing procedure is: first
It is passed through in the first reaction tank, adds sodium sulfide and carry out heavy metals removal process, in rear entrance the second reaction tank, add iron salt and remove
The S of excess2-。
Incineration of refuse flyash of the present invention washing softening process, it is preferable that the ratio that adds of described PAM solution is 0.1～0.2kg/
Ton flying dust, the concentration of PAM solution is 1～1.5g/L..
Incineration of refuse flyash of the present invention washing softening process, it is preferable that the alkali liquor in step (3) and step (4) is saturated carbon
Acid sodium solution.
Incineration of refuse flyash of the present invention washing softening process, it is preferable that in step (5), the evaporation condensed water of collection is used for three times
Washing.
Incineration of refuse flyash of the present invention washing softening process, it is preferable that in step (1), being passed through water in flying dust, the ratio of mud is
(3～4): 1.
Incineration of refuse flyash of the present invention washing softening process has the advantages that
1, the isolated filtrate of first-stage centrifugal machine B is after hardness coarse adjustment, heavy metals removal process, and enters decalcification centrifuge,
The filtrate that isolated filter cake is discharged with two-stage centrifugal machine A mix after together with carry out subsequent treatment, so can carry out twice water again
Washing, chloride ion content 1.5～2% in former technique mud cake, in the present invention, filter cake chloride ion content is less than 0.5%, solves in filter cake
The problem that chlorinity is too high, it is ensured that Cement Quality.
2, the isolated filtrate of first-stage centrifugal machine B is after hardness coarse adjustment, heavy metals removal process, and enters decalcification centrifuge,
The isolated filtrate of decalcification centrifuge carries out hardness fine setting again, then precipitates, and the precipitation of generation is divided with first-stage centrifugal machine A
Carrying out subsequent treatment, i.e. two parts mud together after the filtrate mixing separated out and take the mode processed respectively, mud will not deposit stifled
Plug pipeline, processing procedure is stable.
3, the isolated filtrate of first-stage centrifugal machine B is after hardness coarse adjustment, heavy metals removal process, and enters decalcification centrifuge,
The isolated filtrate of decalcification centrifuge carries out hardness fine setting again, carries out the most successively precipitating, filtering, regulation filtrate pH to 7～
8, finally it is passed through MVR vaporizer, water treatment efficiency is good, stable effluent quality.
Below in conjunction with the accompanying drawings the incineration of refuse flyash washing softening process of the present invention is described further.
Accompanying drawing explanation
Fig. 1 is the flow chart of incineration of refuse flyash of the present invention washing softening process.
Detailed description of the invention
Embodiment 1
A kind of incineration of refuse flyash washing softening process, comprises the following steps:
(1) in flying dust, it is passed through water, and is stirred, the most once wash, after having washed, be passed through first-stage centrifugal machine A
Carry out a centrifuge dehydration, in isolated filtrate, add PAM solution mix homogeneously, then pass to first-stage centrifugal machine B
Carry out secondary centrifuging dehydration；
(2) the first-stage centrifugal isolated filter cake of machine A, B is carried out secondary washing, then pass to two-stage centrifugal machine A and be centrifuged
Dehydration, adds PAM solution mix homogeneously in isolated filtrate, then passes to two-stage centrifugal machine B and carries out secondary centrifuging and take off
Water；
(3) in the first-stage centrifugal isolated filtrate of machine B, add alkali liquor, such as saturated sodium carbonate solution, carry out hardness for the first time thick
Adjust, in terms of CaO, by Hardness Control at about 600ppm, after carrying out heavy metals removal process, enter in decalcification centrifuge carry out from
The heart separate, the filtrate that isolated filter cake is discharged with two-stage centrifugal machine A mix after together with carry out subsequent treatment；
(4) in the isolated filtrate of decalcification centrifuge, add alkali liquor such as saturated sodium carbonate solution, Hardness Control is being less than
50ppm；
(5) precipitate after fully reacting, then filter, regulate filtrate pH to 7.5, then pass to MVR vaporizer,
Collect evaporation condensed water, can be used for three washings；
(6) subsequent treatment is carried out together with after the precipitation of step (5) gained being mixed with the first-stage centrifugal isolated filtrate of machine A.
Embodiment 2
As it is shown in figure 1, a kind of incineration of refuse flyash washing softening process, comprise the following steps:
(1) being passed through by flying dust in pre-agitator tank, be passed through water simultaneously, the ratio of mud is 3:1, and is stirred, and then passes to one-level
Water washing tank is once washed, and enters first-stage centrifugal machine A and be centrifuged dehydration after having washed, and isolated filter cake enters two grades
Water washing tank, adds PAM solution mix homogeneously in filtrate, adds the dry flying dust of ratio 0.1kg/ ton, and the concentration of PAM solution is
1.5g/L, then passes to first-stage centrifugal machine B and carries out secondary centrifuging dehydration, and isolated filter cake enters two grades of water washing tanks, and filtrate is entered
Enter the first intermediate pool；
(2) the isolated filter cake of first-stage centrifugal machine A, B carries out secondary washing at two grades of water washing tanks, subsequently into two-stage centrifugal machine
A is centrifuged dehydration, and isolated filter cake enters tertiary effluent cleaning of evaporator, adds PAM solution mix homogeneously, add in filtrate
Ratio 0.1kg/ ton flying dust, the concentration of PAM solution is 1.5g/L, then passes to two-stage centrifugal machine B and carries out secondary centrifuging dehydration,
Isolated filter cake enters tertiary effluent cleaning of evaporator, and filtrate enters pre-agitator tank for once washing；
The isolated filter cake of two-stage centrifugal machine A, B carries out three washings in tertiary effluent cleaning of evaporator, enters three grades and be centrifuged after having washed
Machine A is centrifuged dehydration, cement baking after isolated filter cake drying, adds PAM solution mix homogeneously in filtrate,
Adding ratio 0.2kg/ ton flying dust, the concentration of PAM solution is 1g/L, then passes to three grades of centrifuge B and carries out secondary centrifuging dehydration,
Cement baking after isolated filter cake drying, filtrate enters two grades of water washing tanks and washes for secondary；
(3) in the first intermediate pool, add alkali liquor, such as saturated sodium carbonate solution, carry out hardness coarse adjustment for the first time, in terms of CaO,
By Hardness Control at about 420ppm, then passing in the first reaction tank, the sodium sulfide adding excess carries out heavy metals removal process,
In rear entrance the second reaction tank, add iron salt such as ferrous sulfate and remove the S of excess2-, subsequently into centrifugation in decalcification centrifuge,
The filtrate that filter cake after separation is discharged with two-stage centrifugal machine A mixes, and is removed by salt remaining in filter cake, then with two-stage centrifugal
The filtrate that machine A discharges carries out subsequent treatment together；
(4) the isolated filtrate of decalcification centrifuge enters the second intermediate pool, and the filtrate in the second intermediate pool is according to 20m3/h
Flow enter water stabilization reaction tank, in water stabilization reaction tank add alkali liquor carry out hardness fine setting, by Hardness Control little
In 50ppm, use hardness on-line computing model that hardness is monitored in real time, adjust alkali liquor according to the hardness data recorded and add
Amount, computing formula is as follows: (1.9A*B)/C=D,
The hardness (in terms of calcium oxide, unit mg/L) of A: filtrate,
The flow of B: filtrate, unit m3/ h,
The concentration of C: sodium carbonate, unit mg/L,
The flow of D: sodium carbonate, unit m3/ h,
(5) entering one-level stable regulation pond after fully reacting to precipitate, supernatant entrance two-stage stabilising regulating reservoir carries out secondary and sinks
Forming sediment, the supernatant after secondary precipitation sequentially enters sandfiltration pot, fine straining tank carries out sand filtration and fine straining, regulates filtrate pH to 7, enters
MVR feed cistern, then passes to MVR vaporizer, collection evaporation condensed water to clear water reserviors, washes for three times,
(6) carry out together with after the filtrate that the mud bottom one-level, two-stage stabilising regulating reservoir is discharged with first-stage centrifugal machine A respectively mixes
Subsequent treatment.
Embodiment 3
As it is shown in figure 1, a kind of incineration of refuse flyash washing softening process, comprise the following steps:
(1) being passed through by flying dust in pre-agitator tank, be passed through water simultaneously, the ratio of mud is 4:1, and is stirred, and then passes to one-level
Water washing tank is once washed, and enters first-stage centrifugal machine A and be centrifuged dehydration after having washed, and isolated filter cake enters two grades
Water washing tank, adds PAM solution mix homogeneously in filtrate, adds the dry flying dust of ratio 0.2kg/ ton, and the concentration of PAM solution is
1g/L, then passes to first-stage centrifugal machine B and carries out secondary centrifuging dehydration, and isolated filter cake enters two grades of water washing tanks, and filtrate enters
First intermediate pool；
(2) the isolated filter cake of first-stage centrifugal machine A, B carries out secondary washing at two grades of water washing tanks, subsequently into two-stage centrifugal machine
A is centrifuged dehydration, and isolated filter cake enters tertiary effluent cleaning of evaporator, adds PAM solution mix homogeneously, add in filtrate
Ratio 0.2kg/ ton flying dust, the concentration of PAM solution is 1g/L, then passes to two-stage centrifugal machine B and carries out secondary centrifuging dehydration, point
The filter cake separated out enters tertiary effluent cleaning of evaporator, and filtrate enters pre-agitator tank for once washing；
The isolated filter cake of two-stage centrifugal machine A, B carries out three washings in tertiary effluent cleaning of evaporator, enters three grades and be centrifuged after having washed
Machine A is centrifuged dehydration, cement baking after isolated filter cake drying, adds PAM solution mix homogeneously in filtrate,
Adding ratio 0.1kg/ ton flying dust, the concentration of PAM solution is 1.5g/L, then pass to three grades of centrifuge B carry out secondary centrifuging take off
Water, cement baking after isolated filter cake drying, filtrate enters two grades of water washing tanks and washes for secondary；
(3) in the first intermediate pool, add alkali liquor, such as saturated sodium carbonate solution, carry out hardness coarse adjustment for the first time, in terms of CaO,
By Hardness Control at about 780ppm, then passing in the first reaction tank, the sodium sulfide adding excess carries out heavy metals removal process,
In rear entrance the second reaction tank, add iron salt such as ferrous sulfate and remove the S of excess2-, subsequently into centrifugation in decalcification centrifuge,
The filtrate that filter cake after separation is discharged with two-stage centrifugal machine A mixes, and is removed by salt remaining in filter cake, then with two-stage centrifugal
The filtrate that machine A discharges carries out subsequent treatment together；
(4) the isolated filtrate of decalcification centrifuge enters the second intermediate pool, and the filtrate in the second intermediate pool is according to 30m3/h
Flow enter water stabilization reaction tank, in water stabilization reaction tank add alkali liquor carry out hardness fine setting, by Hardness Control little
In 50ppm, use hardness on-line computing model that hardness is monitored in real time, adjust alkali liquor according to the hardness data recorded and add
Amount, computing formula is as follows: (1.9A*B)/C=D,
The hardness (in terms of calcium oxide, unit mg/L) of A: filtrate,
The flow of B: filtrate, unit m3/ h,
The concentration of C: sodium carbonate, unit mg/L,
The flow of D: sodium carbonate, unit m3/ h,
(5) entering one-level stable regulation pond after fully reacting to precipitate, supernatant entrance two-stage stabilising regulating reservoir carries out secondary and sinks
Forming sediment, the supernatant after secondary precipitation sequentially enters sandfiltration pot, fine straining tank carries out sand filtration and fine straining, regulates filtrate pH to 8, enters
MVR feed cistern, then passes to MVR vaporizer, and collection evaporation condensed water to clear water reserviors, for three washings, clear water reserviors water source
Based on evaporation condensed water, tap water is make-up water source；
(6) carry out together with after the filtrate that the mud bottom one-level, two-stage stabilising regulating reservoir is discharged with first-stage centrifugal machine A respectively mixes
Subsequent treatment.
Incineration of refuse flyash of the present invention washing softening process has the advantages that
1, the isolated filtrate of first-stage centrifugal machine B is after hardness coarse adjustment, heavy metals removal process, and enters decalcification centrifuge,
The filtrate that isolated filter cake is discharged with two-stage centrifugal machine A mix after together with carry out subsequent treatment, so can carry out twice water again
Washing, chloride ion content 1.5～2% in former technique mud cake, in the present invention, filter cake chloride ion content is less than 0.5%, solves in filter cake
The problem that chlorinity is too high, it is ensured that Cement Quality.
2, the isolated filtrate of first-stage centrifugal machine B is after hardness coarse adjustment, heavy metals removal process, and enters decalcification centrifuge,
The isolated filtrate of decalcification centrifuge carries out hardness fine setting again, then precipitates, and the precipitation of generation is divided with first-stage centrifugal machine A
Carrying out subsequent treatment, i.e. two parts mud together after the filtrate mixing separated out and take the mode processed respectively, mud will not deposit stifled
Plug pipeline, processing procedure is stable.
3, the isolated filtrate of first-stage centrifugal machine B is after hardness coarse adjustment, heavy metals removal process, and enters decalcification centrifuge,
The isolated filtrate of decalcification centrifuge carries out hardness fine setting again, carries out the most successively precipitating, filtering, regulation filtrate pH to 7～
8, finally it is passed through MVR vaporizer, high treating effect, stable effluent quality.
4, when addition alkali liquor carries out hardness fine setting, use hardness on-line computing model that hardness is monitored in real time, hard according to record
Degrees of data adjusts alkali liquor dosage, easy and simple to handle, and efficiency is high, and regulating effect is good.
5, being the most once centrifuged after washing, isolated filtrate carries out secondary centrifuging, washing effect again after adding PAM solution every time
The best, carry-over loss amount is little.
Embodiment described above is only to be described the preferred embodiment of the present invention, not carries out the scope of the present invention
Limiting, on the premise of designing spirit without departing from the present invention, technical scheme is made by those of ordinary skill in the art
Various deformation and improvement, all should fall in the protection domain that claims of the present invention determines.
Claims (9)
1. an incineration of refuse flyash washing softening process, it is characterised in that comprise the following steps:
(1) in flying dust, it is passed through water, and is stirred, the most once wash, after having washed, be passed through first-stage centrifugal machine A
Carry out a centrifuge dehydration, in isolated filtrate, add PAM solution mix homogeneously, then pass to first-stage centrifugal machine B
Carry out secondary centrifuging dehydration；
(2) the first-stage centrifugal isolated filter cake of machine A, B is carried out secondary washing, then pass to two-stage centrifugal machine A and be centrifuged
Dehydration, adds PAM solution mix homogeneously in isolated filtrate, then passes to two-stage centrifugal machine B and carries out secondary centrifuging and take off
Water；
(3) in the first-stage centrifugal isolated filtrate of machine B, add alkali liquor, carry out hardness coarse adjustment for the first time, in terms of CaO, by hardness
Control 400～800ppm, after carrying out heavy metals removal process, be centrifuged in entering decalcification centrifuge separating, isolated
The filtrate that filter cake is discharged with two-stage centrifugal machine A mix after together with carry out subsequent treatment；
(4) in the isolated filtrate of decalcification centrifuge, alkali liquor is added, by Hardness Control less than 50ppm；
(5) precipitate after fully reacting, then filter, regulate filtrate pH to 7～8, then pass to MVR vaporizer,
Collect evaporation condensed water；
(6) subsequent treatment is carried out together with after the precipitation of step (5) gained being mixed with the first-stage centrifugal isolated filtrate of machine A.
Incineration of refuse flyash the most according to claim 1 washing softening process, it is characterised in that: in step (4), add
The detailed process entering alkali liquor is: the isolated filtrate of decalcification centrifuge is introduced into the second intermediate pool, the filter in the second intermediate pool
Liquid is according to 20～30m3The flow of/h enters water stabilization reaction tank, adds alkali liquor and carry out hardness fine setting in water stabilization reaction tank,
By Hardness Control less than 50ppm, hardness on-line computing model is used hardness to be monitored in real time, according to the hardness data recorded
Adjusting alkali liquor dosage, computing formula is as follows: (1.9A*B)/C=D,
The hardness of A: filtrate, in terms of calcium oxide, unit mg/L,
The flow of B: filtrate, unit m3/ h,
The concentration of C: alkali liquor, unit mg/L,
The flow of D: alkali liquor, unit m3/h。
Incineration of refuse flyash the most according to claim 2 washing softening process, it is characterised in that: in step (5), heavy
The detailed process formed sediment and filter is: fully first enters one-level stable regulation pond after reaction and precipitates, and supernatant enters back into two grades surely
Determining regulating reservoir and carry out secondary precipitation, the supernatant after secondary precipitation carries out sand filtration and fine straining successively.
Incineration of refuse flyash the most according to claim 3 washing softening process, it is characterised in that: in step (2), will
The two-stage centrifugal isolated filter cake of machine A, B, for once washing, is carried out three washings by the isolated filtrate of two-stage centrifugal machine B,
Entering three grades of centrifuge A after having washed and be centrifuged dehydration, cement baking after isolated filter cake drying, to isolated
Add PAM solution mix homogeneously in filtrate, then pass to three grades of centrifuge B and carry out secondary centrifuging dehydration, isolated filter cake
Cement baking after drying, filtrate is washed for secondary.
5. wash softening process according to the incineration of refuse flyash described in Claims 2 or 3, it is characterised in that: in step (3),
Heavy metals removal processing procedure is: be first passed through in the first reaction tank, adds sodium sulfide and carries out heavy metals removal process, enters afterwards
In two reaction tanks, add iron salt and remove the S of excess2-。
Incineration of refuse flyash the most according to claim 4 washing softening process, it is characterised in that: described PAM solution
The ratio of adding is 0.1～0.2kg/ ton flying dust, and the concentration of PAM solution is 1～1.5g/L.
Incineration of refuse flyash the most according to claim 2 washing softening process, it is characterised in that: step (3) and step
(4) alkali liquor in is saturated sodium carbonate solution.
8. wash softening process according to the incineration of refuse flyash described in Claims 2 or 3, it is characterised in that: in step (5),
The evaporation condensed water collected is for three washings.
9. wash softening process according to the incineration of refuse flyash described in Claims 2 or 3, it is characterised in that: in step (1),
Being passed through water in flying dust, the ratio of mud is (3～4): 1.
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| CN105080936B (en) * | 2015-08-25 | 2017-09-22 | 湖州森诺环境科技有限公司 | A kind of garbage flying ash cement kiln synergic processing method |
| CN105107821B (en) * | 2015-08-25 | 2017-10-20 | 湖州森诺环境科技有限公司 | A kind of garbage flying ash cement kiln synergic processing and recycling of water resource method of disposal |
| CN105080935B (en) * | 2015-08-25 | 2017-10-20 | 湖州森诺环境科技有限公司 | A kind of garbage flying ash cement kiln synergic processing and recycling of water resource utilize system |
| CN106746124A (en) * | 2017-01-04 | 2017-05-31 | 浙江万银节能环保科技有限公司 | Garbage flying ash water-washing pre-treatment and cement kiln collaboration disposal of resources system |
| CN108706802B (en) * | 2018-04-25 | 2021-06-08 | 中广核研究院有限公司 | Treatment method and treatment system for pollutants generated by household garbage incineration |
| CN109368866A (en) * | 2018-11-27 | 2019-02-22 | 上海电气集团股份有限公司 | A kind of incineration of refuse flyash water lotion decalcification system and decalcification method |
| CN109368901A (en) * | 2018-11-27 | 2019-02-22 | 上海电气集团股份有限公司 | A kind of incineration of refuse flyash water washing treating system and method |
| CN109264898A (en) * | 2018-11-27 | 2019-01-25 | 上海电气集团股份有限公司 | A kind of flying dust multistage dechlorination and water lotion decalcification softening process and its system |
| CN110947529B (en) * | 2019-11-20 | 2022-08-02 | 浙江工业大学 | Household garbage incineration fly ash washing dechlorination system and use method thereof |
| CN113354317A (en) * | 2020-03-05 | 2021-09-07 | 北京中科国润环保科技有限公司 | System and method for recycling and harmless disposal of low-chlorine fly ash |
| CN111265809B (en) * | 2020-03-29 | 2021-05-28 | 浙江红狮环保股份有限公司 | Preparation and application of high-chlorine fly ash washing agent |
| CN112588771B (en) * | 2020-10-30 | 2022-09-13 | 芜湖海创环保科技有限责任公司 | Water washing method for fly ash |
| CN114871257A (en) * | 2022-05-23 | 2022-08-09 | 安徽海螺环保集团有限公司 | Pretreatment method and pretreatment equipment for co-processing fly ash |
| CN118122759A (en) * | 2024-05-08 | 2024-06-04 | 北京中科国润环保科技有限公司 | High-efficiency desalting process method for solid waste |
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Denomination of invention: Water washing and softening process of MSWI fly ash Effective date of registration: 20210625 Granted publication date: 20160824 Pledgee: Zhongguancun Beijing technology financing Company limited by guarantee Pledgor: BJ ZKGR TECHNOLOGY Co.,Ltd. Registration number: Y2021990000560 |
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