CN105731681B - Treatment device and process for catalytic cracking flue gas desulfurization waste liquid - Google Patents
Treatment device and process for catalytic cracking flue gas desulfurization waste liquid Download PDFInfo
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- CN105731681B CN105731681B CN201410766908.3A CN201410766908A CN105731681B CN 105731681 B CN105731681 B CN 105731681B CN 201410766908 A CN201410766908 A CN 201410766908A CN 105731681 B CN105731681 B CN 105731681B
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- oxidation tank
- desulfurization waste
- air oxidation
- waste liquor
- clarifier
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- 239000002699 waste material Substances 0.000 title claims abstract description 145
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 117
- 230000023556 desulfurization Effects 0.000 title claims abstract description 114
- 239000007788 liquid Substances 0.000 title claims abstract description 40
- 238000004523 catalytic cracking Methods 0.000 title claims abstract description 35
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 31
- 239000003546 flue gas Substances 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 29
- 230000008569 process Effects 0.000 title abstract description 14
- 230000003647 oxidation Effects 0.000 claims abstract description 109
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 109
- 239000012528 membrane Substances 0.000 claims abstract description 12
- 239000000919 ceramic Substances 0.000 claims abstract description 11
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000005273 aeration Methods 0.000 claims description 27
- 239000003513 alkali Substances 0.000 claims description 15
- 241000220317 Rosa Species 0.000 claims description 14
- 239000010802 sludge Substances 0.000 claims description 9
- 230000003009 desulfurizing effect Effects 0.000 claims description 7
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 6
- 239000005864 Sulphur Substances 0.000 claims description 6
- 239000007921 spray Substances 0.000 claims description 4
- 229910052573 porcelain Inorganic materials 0.000 claims description 3
- 125000004122 cyclic group Chemical group 0.000 claims description 2
- 150000003839 salts Chemical class 0.000 claims 1
- 238000001914 filtration Methods 0.000 abstract description 10
- 238000000926 separation method Methods 0.000 abstract description 10
- 239000006228 supernatant Substances 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 3
- 230000005484 gravity Effects 0.000 abstract description 3
- 238000003756 stirring Methods 0.000 abstract description 3
- 230000003311 flocculating effect Effects 0.000 abstract description 2
- 239000008394 flocculating agent Substances 0.000 abstract 1
- 239000003054 catalyst Substances 0.000 description 10
- 239000000428 dust Substances 0.000 description 9
- 239000002002 slurry Substances 0.000 description 9
- 239000002893 slag Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical compound [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 229910052708 sodium Inorganic materials 0.000 description 5
- 239000011734 sodium Substances 0.000 description 5
- 239000000706 filtrate Substances 0.000 description 4
- 230000001376 precipitating effect Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 230000001590 oxidative effect Effects 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000003517 fume Substances 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000010926 purge Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000008719 thickening Effects 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000005276 aerator Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005352 clarification Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- VFNGKCDDZUSWLR-UHFFFAOYSA-L disulfate(2-) Chemical compound [O-]S(=O)(=O)OS([O-])(=O)=O VFNGKCDDZUSWLR-UHFFFAOYSA-L 0.000 description 1
- 238000005374 membrane filtration Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000002901 radioactive waste Substances 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000010129 solution processing Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Landscapes
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
The invention provides a catalytic cracking flue gas desulfurization waste liquid treatment device and a process, wherein the device comprises a two-stage air oxidation tank and a clarifier, wherein a ceramic membrane filter is obliquely arranged below the inner part of the two-stage air oxidation tank; the device is adopted to carry out the treatment process of the desulfurization waste liquid, the desulfurization waste liquid is discharged into an oxidation tank, the waste liquid and a flocculating agent are uniformly mixed through air stirring while the oxidation tank is oxidized, a large flocculating body is formed after micro particulate matters are flocculated and then is discharged into a clarifier, solid-liquid separation is realized through gravity settling in the clarifier, supernatant is discharged into the oxidation tank, and the waste liquid is discharged after being filtered through air oxidation and a ceramic filter and reaches the standard. Compared with the prior art, the process utilizes the characteristic of high temperature of the catalytic cracking flue gas desulfurization waste liquid, improves the oxidation speed of sulfite, reduces the occupied area of equipment, adopts gravity settling and ceramic filter filtration aiming at the property of particulate matters, has thorough removal effect of suspended matters, and solves the problem of blockage.
Description
Technical field
The present invention relates to the processing unit of catalytic cracking flue gas desulfurization waste liquor and techniques, and in particular to a kind of sodium alkali catalysis
The processing unit and treatment process of cracking flue gas desulfurization waste liquor.
Background technique
Regeneration fume from catalytic cracking process is administered using sodium alkali, is normally being transported in catalytic cracking flue gas dust-removing desulfurating apparatus
When row, in order to guarantee certain desulfurization effect, need to the chloride ion in absorbing liquid, suspended matter, pH value, soluble solid content
It is controlled, if after measured, These parameters reach circulatory system when technique requires and discharge unit absorbing liquid is needed to meet dedusting
The technique requirement of desulphurization system.The desulfuration waste liquid treatment process of this partial discharge is by concentrator or clarifier waste liquid at present
It is divided into supernatant and underflow liquid, supernatant discharges after multi-staged air aoxidizes in oxidation tank, and underflow liquid filters laggard through Rose Box
Row is separated by solid-liquid separation.Existing treatment process is the problem is that suspended matter (SS), COD content are high after desulfurization waste liquor processing, processing stream
Journey is long, takes up a large area；To solve the above-mentioned problems, CN102815808A provides a kind of catalytic cracking flue gas doctor solution processing
The desulfurization waste liquor that catalytic cracking flue gas desulfuration absorbing tower discharges is discharged into slurry pool and mixed with flocculant by technique, the technique, is utilized
Blender stirring mixes desulfurization waste liquor with flocculant, and mixed desulfurization waste liquor is discharged into tube-expanding type filter, passes through tube expansion mistake
Filter membrane filtration obtains dense slag and supernatant after realizing separation of solid and liquid, and dense slag enters Rose Box, and dense slag carries out in Rose Box
Thickening, the mud cake external application of concentration, the water of abjection return to slurry pool, and the supernatant of generation passes through second level in oxidation tank
Inferior sulfate radical, bisulfite are oxidized to sulfate radical by air oxidation, so that COD be removed, make to discharge water COD≤100mg/l,
SS≤60mg/l.Compared with original technique, which original concentrator or subsider are changed to slurry pool and tube-expanding type filters
Device, remaining equipment are basically unchanged, the not big variation of the occupied area of package unit.The technique operational process there are the problem of
It is that the desulfurization waste liquor (70-80 DEG C of temperature) of fume desulfurizing tower discharge is discharged into slurry pool to mix with flocculant, is stirred using blender
Mixing mixes desulfurization waste liquor with flocculant, is mixed by the desulfurization waste liquor that blender discharges system with flocculant, leads to desulfurization
Waste liquid temperature reduces (temperature reduces 10-20 DEG C), and winter drops more, after desulfurization waste liquor temperature reduces, so that air oxidation is sub-
The decline of sulfate rate causes the desulfurization waste liquor processing residence time to increase；Since SS is mainly in the desulfurization waste liquor of system discharge
Catalyst dust, wherein 10 microns of SS below account for 90% or more, after flocculant mixing is added, catalyst dust is in flocculant
Under the action of, big wadding body is formed, when filtering by tube-expanding type filter, tube-expanding type filtering membrane of filter is be easy to cause to block, needed
Frequently to rinse tube expansion filtering membrane of filter, large labor intensity.
Summary of the invention
It is an object of that present invention to provide a kind of processing unit of sodium alkali catalytic cracking flue gas desulfurization waste liquor and use the dress
The technique for setting processing desulfurization waste liquor, compared with the prior art, this process increases air oxidation sulphite and bisulfites
Efficiency, high to COD, SS removal rate, easy to operate, labor intensity is low, and land occupation face is smaller.
A kind of catalytic cracking flue gas desulfurization waste liquor processing unit of the present invention, mainly include main air oxidation tank 1,
Clarifier 2 and secondary air oxidation tank 3,1 outside lower end of main air oxidation tank are equipped with desulfurization waste liquor entrance 4 and flocculant entrance
5, the middle and lower part in main air oxidation tank 1 is equipped with circulation jet aeration device 6, and circulation jet aeration device 6 is equipped with compressed air
Tube inlet 7 and cyclic spray liquid inlet 8, the outer upper ends of main air oxidation tank 1 are equipped with desulfurization waste liquor outlet 9, and level-one is empty
It is air exhaust duct 10 at the top of gas oxidation tank 1, the desulfurization waste liquor outlet 9 of main air oxidation tank passes through pipeline and clarifier upper end
The desulfurization waste liquor entrance 11 of side connects, and the lower end of clarifier 2 is equipped with waste residue outlet 12, and clarifier desulfurization waste liquor outlet 13 is set to
The 2 upper end other side of clarifier, and be connected by pipeline with the desulfurization waste liquor entrance 15 of 3 lower outside of secondary air oxidation tank,
Secondary air oxidation tank lower inside is obliquely installed purpose ceramic-film filter 17 and air aeration device 18, and secondary air oxidation tank takes off
Sulphur waste liquid outlet 19 and air exhaust duct 10 are located on the outside of upper part and top, and secondary air aoxidizes pot bottom and is equipped with waste residue
Discharge outlet 20.
Bottom of clarifier waste residue outlet 12 is connected with Rose Box 14 respectively with the waste sludge discharge mouth 20 of secondary air oxidation tank
It is logical.
The purpose ceramic-film filter is an elliptic plane, and long axis is greater than secondary air oxidation tank bottom surface interior diameter, makes
Long axis one end of purpose ceramic-film filter is placed on secondary air oxidation tank bottom surface angle or side wall, the other end can tilt according to
It leans against on another side wall of secondary air oxidation tank.The long axis of the purpose ceramic-film filter plane and secondary air oxidation tank bottom surface institute
Be greater than 0 ° and less than 90 ° at angle, preferably greater than 10 ° less than 80 °, more preferably higher than 30 ° less than 75 °.Using above-mentioned dress
The technique for setting processing catalytic cracking flue gas desulfurization waste liquor is as follows: the desulfurization waste liquor of catalytic cracking flue gas desulfurizing tower bottom discharge is first
Enter main air oxidation tank 1 by the desulfurization waste liquor entrance 4 of 1 outside lower end of main air oxidation tank, is sprayed by circulation air
It penetrates aerator 6 and air oxidation is carried out to sulphite, the bisulfites in desulfurization waste liquor, improve air to sulfate, Asia
The oxidation efficiency of disulfate；Flocculant enters in main air oxidation tank 1 from flocculant entrance 5, is aerated using circulation air
Device is stirred flocculant and desulfurization waste liquor, prevents catalytic cracking catalyst dust and flocculant in desulfurization waste liquor from being formed
Wadding body is deposited to oxidation pot bottom；The desulfurization waste liquor that main air oxidation tank comes out enters clarifier 2, in clarifier, passes through
Natural subsidence separation, obtained dense slag enter Rose Box 14, and the desulfurization waste liquor isolated passes through the desulfurization of secondary air oxidation tank 3
Waste liquid entrance 15 enters secondary air oxidation tank, and desulfurization waste liquor passes through ceramic membrane filter under conditions of air aeration device 18 is aerated
Device 17, then from 19 discharge of the desulfurization waste liquor on secondary air oxidation tank top outlet.
Alkali liquor inlet 16 is arranged in 3 lower outside of secondary air oxidation tank, adds alkali to secondary air oxidation tank by the entrance
In, the pH value for adjusting desulfurization waste liquor is 7 or so, reaches the discharge index of waste liquid.
The device and technique of present invention processing sodium alkali catalytic cracking flue gas desulfurization waste liquor are main compared with prior art
Difference is, takes full advantage of the temperature of catalytic cracking flue gas desulfurization waste liquor, by catalytic cracking flue gas desulfurizing tower bottom discharge
Desulfurization waste liquor (about 70-80 DEG C), which is introduced directly into main air oxidizing tower, carries out air oxidation, is proved by test at 70-80 DEG C
At a temperature of use air oxidation sulphite and bisulfites, than temperature reduce 10-20 DEG C of oxidizing desulfurated waste liquid, can shorten
The waste liquid residence time 0.5-1.5 hours, reduce 1/3 or more oxidizing tower volume.Suspended matter is catalyzed in desulfurization waste liquor with catalytic cracking
Based on agent dust, partial size at 10 microns hereinafter, wherein 5 microns or more account for 90%, have than great, be easy the spy of precipitating
Point, precipitability is more preferable after flocculant is added, if filtered using tube-expanding type filter, easily blocks tube-expanding type filter.
The present invention is on the basis of studying catalyst dust settleability test, using the method for secondary filtration, level-one mistake
Filter utilizes the heavy feature of catalytic cracking catalyst dust, forms big wadding body after flocculant is added, catalyst granules is quick
Sedimentation, is separated using gravitational settling, easy to operate, and equipment and investment are small.Secondary filtration uses purpose ceramic-film filter, to not
The catalyst dust to flocculate further filters；Purpose ceramic-film filter slant setting passes through two in secondary air oxidation tank
The aeration head of grade air oxidation tank purges purpose ceramic-film filter surface, prevents catalyst dust from blocking ceramic membrane filter
Device.
The invention has the advantages that
1, catalytic cracking flue gas desulfurization tower bottom row is utilized in air oxidation sulphite, bisulfites desulfurization waste liquor
The characteristics of desulfurization waste liquor temperature high (70-80 DEG C) put, sulphite, Bisulphite rate are improved, is shortened useless
The residence time of water reduces the volume of device；
2, the suspended matter in desulfurization waste liquor is handled using classification, and flocculant is added in first order separation, to the big flocculating body of formation
Using gravity settling separation, second level separation is filtered using purpose ceramic-film filter, improves the abjection effect of SS, is filled through the present invention
Set COD≤60mg/l, the SS≤70mg/l of the desulfurization waste liquor discharged after processing.
3, secondary air oxidation tank is mounted with that purpose ceramic-film filter and air aeration device, purpose ceramic-film filter use 5 microns
Following filter, secondary oxidation tower air further aoxidize sulphite, bisulfites, while reducing COD, to pottery
Porcelain filter is rinsed, and prevents ceramic filter from stopping up.
Detailed description of the invention
Fig. 1 is catalytic cracking flue gas desulfurization waste liquor processing unit schematic diagram of the invention；
Fig. 2 is domestic introduction existing catalytic cracking flue gas desulfurization waste liquor processing unit schematic diagram (Gong Wangxin, " petrochemical industry skill
Art ", 2011, (12): 37)；
Fig. 3 is the catalytic cracking flue gas desulfurization waste liquor processing unit schematic diagram in CN102815808A；
Fig. 4 is the structural schematic diagram of main air oxidation tank of the present invention；
The structural schematic diagram of Fig. 5 secondary air oxidation tank of the present invention；
1- main air oxidation tank, 2- clarifier, 3- secondary air oxidation tank, 4- main air oxidation tank desulfurization waste liquor enter
Mouthful, 5- flocculant entrance, 6- circulation jet aeration device, 7- compressed air tube inlet, 8- cyclic spray liquid inlet, 9- level-one sky
The outlet of gas oxidation tank desulfurization waste liquor, 10- air exhaust duct, 11- clarifier desulfurization waste liquor entrance, 12- waste residue outlet, 13- clarification
The outlet of device desulfurization waste liquor, 14- Rose Box, 15- secondary air oxidation tank desulfurization waste liquor entrance, 16- alkali liquor inlet, 17- ceramic membrane
Filter, 18- air aeration device, the outlet of 19- secondary air oxidation tank desulfurization waste liquor, 20- waste sludge discharge mouth.
A- clarifier, b- oxidation tank, c- aeration head, d- Rose Box, e- metering pump, f- filtrate hole, g- blender, c- aeration
Head, h- alkali addition valve, l- blender；
Buffer pool, E- oxidation tank, F- oxygen is concentrated in A- slurry pool, B- tube-expanding type filter, C- tube-expanding type filter, D- slurry
Change tank, G- oxidation tank, H- flocculant dosing pump, I- blender, J- aeration head, K- blender, L- aeration head, M- blender, N-
Aeration head, O- blender, P- alkali addition valve.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention is made into one with reference to the accompanying drawing
Step detailed description.As shown in Figure 1, using the technical treatment catalytic cracking and desulfurizing waste liquid, desulfurization waste liquor COD about 4000mg/l, SS
About 200mg/l requires COD≤50mg/l, SS≤50mg/l after processing.Catalytic cracking flue gas desulfurization waste liquor processing system of the present invention
Including main air oxidation tank 1, clarifier 2, secondary air oxidation tank 3.
70-80 DEG C of desulfurization waste liquor of catalytic cracking flue gas desulfurizing tower outlet is entered by 1 lower part desulfurization waste liquor of main air oxidation tank
Mouth 4 enters main air oxidation tank 1, and when entering main air oxidation 1, flocculant is added to level-one sky by flocculant entrance
In gas oxidation tank 1, flocculant enters the lower part of main air oxidation tank 1 with desulfurization waste liquor, in main air oxidation tank 1 under
Circulation jet aeration device 6 is installed in portion, has compressed air tube inlet 7 and injection liquid inlet 8 on circulation jet aeration device 6, in ring
Desulfurization waste liquor and flocculant are uniformly mixed in main air oxidation tank under the action of stream jet aeration device 6, while circulation injection exposes
The nozzle of gas device 6 is installed downwards, is played the role of stirring, and prevents 1 lower part of main air oxidation tank from precipitating, main air oxygen
Changing 1 top of tank has desulfurization waste liquor to export 9, air exhaust duct 10, desulfurization waste liquor residence time 30-40 in main air oxidation tank 1
Minute.Desulfurization waste liquor gets to 2 middle part of clarifier, clarifier 2 by pump from 1 top desulfurization waste liquor of main air oxidation tank outlet 9
There is desulfurization waste liquor entrance 11 at middle part, and clarifier 2 is currently used structure, is separated by solid-liquid separation by gravitational settling, clarifier 2
Middle part have desulfurization waste liquor entrance 11, under have a waste residue outlet 12, top has desulfurization waste liquor to export 13, the waste residue that clarifier 2 generates
Rose Box 14 is discharged to by waste residue outlet 12, after the filtering of Rose Box 14, waste landfills processing, desulfurization waste liquor is discharged into cesspit, receives
Collect the desulfurization waste liquor in cesspit, when reaching certain liquid level, clarifier 2 is knocked down by pump, desulfurization waste liquor goes out from clarifier top
Desulfurization waste liquor COD≤100mg/l, the SS≤70mg/l of 13 discharge of mouth.From the de- of 2 top desulfurization waste liquor of clarifier outlet, 13 discharge
Sulphur waste liquid enters the desulfurization waste liquor entrance 15 of 3 lower part of secondary air oxidation tank, flows into secondary air oxidation tank 3, secondary air oxygen
Changing 3 middle and lower part of tank has lye that mouth 16 is added, and the desulfurization waste liquor pH value in secondary air oxidation tank 3 is adjusted, secondary air
Tilted-putted ceramic membrane mesh device 17 is equipped in oxidation tank 3, the suspended matter that clarifier does not remove passes through purpose ceramic-film filter
17 further removals, 17 lower part of purpose ceramic-film filter arrange that air aeration device 18, air aeration device 18 spray sky by inclined direction
While gas aoxidizes desulfurization waste liquor, purging cleaning is carried out to purpose ceramic-film filter 17, prevents catalyst dust from blocking ceramic membrane
Filter 17, air aeration device 18 also mix lye and desulfurization waste liquor, pass through the desulfurization waste liquor of purpose ceramic-film filter 17
It is discharged by the desulfurization waste liquor outlet 19 on 3 top of secondary air oxidation tank, COD≤50mg/l, SS in the desulfurization waste liquor of discharge
≤ 50mg/l is equipped with air exhaust duct 10 at the top of secondary air oxidation tank 3, and lower part is equipped with waste sludge discharge mouth 20, periodically by waste residue
Discharge outlet 20 is discharged into waste liquid hole.
Comparison column 1: Fig. 2 are domestic introduction U.S. Belco company catalytic cracking flue gas desulfurization waste liquor processing units, using this
The regenerated flue gas of the generation of 3,000,000 tons/year of catalytic cracking units of technical treatment, desulfurization waste liquor design 30~40t/h of discharge amount, take off
Sulphur waste liquid forms COD about 3600mg/l, and SS about 200mg/l requires COD≤100mg/l, SS≤100mg/l after processing.The device
Including clarifier a, oxidation tank b Rose Box d.Catalytic cracking flue gas desulfurizing tower 70-80 DEG C of desulfurization waste liquor of outlet enters clarifier a,
Flocculant is added by flocculant metering pump e, then under the action of blender i, is uniformly mixed flocculant and desulfurization waste liquor, shape
It is deposited to the bottom clarifier a at big wadding body, monitors clarifier a sludge interface height, when sludge interface height reaches certain value,
Clarifier a bottom valve is opened, precipitating sludge is discharged into Rose Box d, filtrate is collected into filtrate hole f, by filtrate pumped back clarifier
A, precipitating sludge form filter residue by filtering, periodically transport outward.Overflow desulfurization waste liquor in clarifier top flows into oxidation tank b, oxidation tank b
It is interior to be equipped with blender g and air aeration device c, in oxidation process, to keep suitable PH, pass through alkali addition valve h control plus alkali
Amount, uses water ph value and maintains 7 or so.Using COD after the process in 700-1500mg/l, SS is in 150mg/l or so, no
It is able to satisfy the emission request of waste liquid.
Comparison column 2: being not thorough, separation and the high problem of rear suspension content for the oxidation of sodium alkali desulfurization waste liquor, patent text
The catalytic cracking flue gas desulfurization waste liquor processing unit schematic diagram provided in CN102815808A is offered, using the technical treatment 1,400,000
The flue gas that ton/year catalytic cracking unit generates, desulfurization waste liquor design 10~14t/h of discharge amount, and desulfurization waste liquor forms COD about
4000mg/l, SS about 200mg/l, require COD≤100mg/l, SS≤100mg/l after processing.The technique is by catalytic cracking flue gas
70-80 DEG C of desulfurization waste liquor of desulfuration absorbing tower discharge is discharged into slurry pool A and mixes with flocculant, and flocculant passes through flocculant dosing pump
H is added, and flocculant is stirred in slurry pool A by blender I, is uniformly mixed desulfurization waste liquor with flocculant, mixed de-
50-60 DEG C of sulphur waste liquid temperature is discharged into tube-expanding type filter B in parallel, C, tube-expanding type filter B, C mono- filtering, a cleaning, phase
Mutually switching uses, and is realized by tube expansion filter B, C filtering and obtains dense slag and supernatant after being separated by solid-liquid separation, dense slag enters Rose Box
D, dense slag carries out thickening, the mud cake external application of concentration in Rose Box, and the water of abjection returns to slurry pool A；What is generated is upper
Clear liquid flows into oxidation tank E, F, G of thtee-stage shiplock, carries out exhaustive oxidation, oxidation tank E, F, G to the desulfurization waste liquor for removing suspended matter
There are aeration head J, L, N and blender K, M in inside, O, to keep suitable pH value, waste liquid outlet by alkali addition valve P control plus
Alkali number makes water outlet pH value maintain 7 or so.Using process heel row radioactive waste liquid COD≤100mg/l, SS≤100mg/l,
It substantially meets emission request, but does not utilize in desulfurization waste liquor catalyst granules to be easy to than great in the treatment process of suspended matter
The characteristics of gravitational settling, causes tube-expanding type filter to need frequent clean, large labor intensity；It reduces COD and does not utilize absorption tower
70-80 DEG C of the desulfurization waste liquor of discharge the characteristics of, and use and increase oxidation tank, cause the desulfurization waste liquor residence time to increase, apparatus body
Product increases.
Claims (8)
1. a kind of catalytic cracking flue gas desulfurization waste liquor processing unit, mainly include main air oxidation tank (1), clarifier (2) and
Secondary air oxidation tank (3), the external lower end of main air oxidation tank (1) is equipped with desulfurization waste liquor entrance (4), outer upper ends are equipped with and take off
Sulphur waste liquid outlet (9), the desulfurization waste liquor outlet of main air oxidation tank pass through the desulfurization waste liquor of pipeline and clarifier upper end side
Entrance (11) connection, clarifier desulfurization waste liquor exports (13) and is set to the clarifier upper end other side, and passes through pipeline and secondary air
The desulfurization waste liquor entrance (15) of oxidation tank lower outside is connected, and is obliquely installed ceramic membrane mistake in secondary air oxidation tank lower inside
The upper outside of filter (17) and air aeration device (18), secondary air oxidation tank is equipped with desulfurization waste liquor outlet (19)；The pottery
Porcelain membrane filter outer rim and secondary air oxidation top tank structure are tightly connected；The external lower end of the main air oxidation tank (1) is equipped with
Flocculant entrance (5)；Main air oxidation tank (1) interior middle and lower part is equipped with circulation jet aeration device (6), circulation jet aeration device
(6) compressed air tube inlet (7) and cyclic spray liquid inlet (8) are equipped with；The air aeration device (18) is located at ceramic membrane
The lower section of filter (17).
2. device as described in claim 1, it is characterised in that the lower end of clarifier is equipped with waste residue outlet (12).
3. device as described in claim 1, it is characterised in that the top of main air oxidation tank and secondary air oxidation tank is equal
Equipped with air exhaust duct (10).
4. device as described in claim 1, it is characterised in that the bottom of secondary air oxidation tank is equipped with waste sludge discharge mouth (20),
Alkali liquor inlet (16) are arranged in lower outside.
5. device as described in claim 1, it is characterised in that bottom of clarifier waste residue outlet (12) and secondary air oxidation tank
Waste sludge discharge mouth (20) be connected respectively with Rose Box (14).
6. device as described in claim 1, it is characterised in that the plane of the purpose ceramic-film filter is ellipse, and long axis is big
In secondary air oxidation tank bottom surface interior diameter, the long axis is greater than 0 ° with secondary air oxidation tank bottom surface angle and is less than
90°。
7. device as claimed in claim 6, it is characterised in that the long axis is with secondary air oxidation tank bottom surface angle
Greater than 30 ° less than 75 °.
8. a kind of technique using device as described in claim 1 processing catalytic cracking flue gas desulfurization waste liquor, it is characterised in that packet
Include: the desulfurization waste liquor of catalytic cracking flue gas desulfurizing tower bottom discharge passes through the de- of the external lower end of main air oxidation tank (1) first
Sulphur waste liquid entrance (4) enters main air oxidation tank, by circulation air jet aeration device (6) to the sulfurous acid in desulfurization waste liquor
Salt and bisulfites carry out air oxidation, and flocculant enters in main air oxidation tank from flocculant entrance (5), main air
The desulfurization waste liquor that oxidation tank comes out enters clarifier (2), and the desulfurization waste liquor that clarifier is isolated passes through secondary air oxidation tank
Desulfurization waste liquor entrance (15) enters secondary air oxidation tank, and desulfurization waste liquor is under conditions of air aeration device (18) are aerated by pottery
Porcelain membrane filter (17) is then discharged from the desulfurization waste liquor on secondary air oxidation tank top outlet (19).
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| CN201410766908.3A CN105731681B (en) | 2014-12-11 | 2014-12-11 | Treatment device and process for catalytic cracking flue gas desulfurization waste liquid |
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| CN105731681B true CN105731681B (en) | 2019-05-07 |
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| CN106745654B (en) * | 2017-01-09 | 2023-08-08 | 宁波科新化工工程技术有限公司 | Desulfurization waste liquid pretreatment process and device |
| CN115488139B (en) * | 2022-09-28 | 2024-05-17 | 中冶南方都市环保工程技术股份有限公司 | Raw material pretreatment system and method for desulfurizing waste liquid and firing acid by crude salt incineration |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20100037357A (en) * | 2008-10-01 | 2010-04-09 | 큐바이오텍 (주) | Method for pre-treating spent caustic wastewater and device therefor |
| CN203741157U (en) * | 2014-03-10 | 2014-07-30 | 中国石油工程建设公司大连设计分公司 | Wet process flue gas desulphurization and washing wastewater treatment device |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20100037357A (en) * | 2008-10-01 | 2010-04-09 | 큐바이오텍 (주) | Method for pre-treating spent caustic wastewater and device therefor |
| CN203741157U (en) * | 2014-03-10 | 2014-07-30 | 中国石油工程建设公司大连设计分公司 | Wet process flue gas desulphurization and washing wastewater treatment device |
Non-Patent Citations (1)
| Title |
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| 火力发电厂脱硫废水处理系统的设计;郭斌;《中国水运》;20130415;第13卷(第4期);第114-115页前言、第一至第三节，图1 |
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