CN110270197A - A kind of washing system of phosphoric acid extraction tail gas - Google Patents
A kind of washing system of phosphoric acid extraction tail gas Download PDFInfo
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- CN110270197A CN110270197A CN201910575092.9A CN201910575092A CN110270197A CN 110270197 A CN110270197 A CN 110270197A CN 201910575092 A CN201910575092 A CN 201910575092A CN 110270197 A CN110270197 A CN 110270197A
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- scrubbing tower
- spray head
- tail gas
- phosphoric acid
- acid extraction
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1406—Multiple stage absorption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1456—Removing acid components
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/20—Halogens or halogen compounds
- B01D2257/204—Inorganic halogen compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/20—Halogens or halogen compounds
- B01D2257/204—Inorganic halogen compounds
- B01D2257/2047—Hydrofluoric acid
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
Abstract
The present invention relates to phosphoric acid extraction washing tail gas technical fields, in particular to a kind of washing system of phosphoric acid extraction tail gas, including Venturi scrubber, scrubbing tower a, scrubbing tower b, scrubbing tower c, scrubbing tower a circulating pump, scrubbing tower b circulating pump, scrubbing tower c primary cycle pump, scrubbing tower c secondary cycle pump；The upper tapering of the Venturi scrubber and middle part are respectively equipped with wash mill, and Venturi scrubber is connect with scrubbing tower a using threeway, and venturi eluting water is sent into fluosilicic acid collecting tank；The present invention not only expands device capbility, reduces energy consumption, also achieves energy-saving and emission-reduction, reduces maintenance number, extends device continuous operating time, reduce operating cost.
Description
Technical field
The present invention relates to phosphoric acid extraction washing tail gas technical field, in particular to a kind of washing system of phosphoric acid extraction tail gas
System.
Background technique
The form of China's rock phosphate in powder association fluor-apatite exists, and the mass fraction of fluorine is 3-4% in rock phosphate in powder, in wet process phosphorus
In acid extraction production process, these fluoride almost all are released and are converted into other existence forms, the study found that phosphorus
The fluorine of mass fraction 70-80% enters in phosphoric acid,diluted in ore, and the fluorine of mass fraction 15-20% enters in ardealite, quality point
The fluorine of number 3-17% enters fluorine absorption system with gas phase.Currently, phosphoric acid extraction vent gas washing system main wash is from extraction
The reaction end gas and filtering tail gas for taking slot, contain a large amount of fluorine gas and other pernicious gases.With the development of industry, environmental protection
Pressure is increasing, for Wet-process Phosphoric Acid Production, that is, wishes to extract the emission limit that exhaust emissions index is far below national regulation,
Extraction equipment cycle of operation extend as far as possible is required again.
Currently, the conventional washing system of phosphoric acid extraction tail gas is will to extract after tail gas enters Venturi scrubber washing to enter
First tail gas washing tower enters the second tail gas washing tower after washing, the tail gas after the washing of the second tail gas washing tower is taken out by blower
Suction and conveying enters third tail gas washing tower, passes through smoke stack emission after washing again in third tail gas washing tower.Washing tail gas moisturizing master
Will be using cinder field return water fill into Venturi scrubber, recirculated water fills into tail gas third scrubbing tower, to preceding overflow after washing, circulation is washed
It washs, finally flows into overflow sink by pump and squeeze into fluosilicic acid slot or overflow discharge, therefore have the following disadvantages: 1. fluorine absorption cycles
Pump easily sucking gypsum causes to block spray equipment；2. washing water underfed causes each tower washing pressure to increase；3. spraying effect
It is bad.
Although patent No. CN201210563646.1 discloses a kind of phosphoric acid extraction exhaust washing method and device.Described
Phosphoric acid extraction exhaust washing method, when washing tail gas, the gas generated by extraction tank is taken out under the traction of blower by draft hood
Out, it first passes around multiple spray rinsing device and carries out spray washing, carry out foam removal processing and spray washing using demister and Venturi tube,
Gas after washing is retracted to chimney emptying by blower by collection gas separating device；But still it not can effectively solve and wash tower endless tube and spray head
The problem of blocking.
For another example patent No. CN201610779254.7 discloses the washing methods and device of a kind of phosphoric acid extraction tail gas, passes through
Traditional Venturi scrubber is substituted using sluicing pipe, and has done the adjustment of adaptability to whole device, especially to washing
The structure for washing pipe is studied, and enables gas according to the washing principle in Venturi scrubber, in straight-through washing
It is washed in pipe, ensure that detersive efficiency, so that being difficult to form the particulate matter of attachment on washing inside pipe wall, and then avoid washing
The phenomenon that washing tube wall agglomeration blocking；And the spray head combination spray equipment in sluicing pipe carries out the rational design of position, so that right
The once washing effect of tail gas is preferable, after avoiding enter into scrubbing tower a, a large amount of crystallization occurs, leads to the spray head in scrubbing tower a
There is a phenomenon where blocking, the ability to washing tail gas purification is improved；But do not solve asking for washing water insufficient pressure thoroughly yet
Topic.
Summary of the invention
The problems such as present invention is low, discharge fluoride is exceeded, cleaning cycle is short for detersive efficiency provides a kind of phosphoric acid extraction
Take the washing system of tail gas.
It is realized particular by following technical scheme:
A kind of washing system of phosphoric acid extraction tail gas, including Venturi scrubber, the scrubbing tower a, scrubbing tower being sequentially connected
B, scrubbing tower c；The upper tapering of the Venturi scrubber and middle part are respectively equipped with wash mill, Venturi scrubber and washing
Tower a is connected using threeway, and venturi eluting water is sent into fluosilicic acid collecting tank；1 is respectively provided at the scrubbing tower a and scrubbing tower b
A circulating pump is equipped with 2 circulating pumps at scrubbing tower c.
Increase circulating pump, the circulating pump parameter are as follows: Q=305m at the fluosilicic acid collecting tank33/ h, H=53m, motor
Y315S-4, N=110Kw.
The spray head model of the Venturi scrubber are as follows: LY:500-10-150, L:150/750.
The scrubbing tower a, scrubbing tower b are equipped with import spray head, top showerhead, and are washed between outlet equipped with 2 sets by import
Wash device, spray head the model LY:500-10-100, L:150/2000 of every set wash mill；The model of the import spray head
LY:500-10-100, L:150/750；The model LY:600-10-150, L:150/1400 of the top showerhead.
The scrubbing tower a is connect with scrubbing tower b by offgas duct, and the offgas duct is equipped with import spray head, middle part spray head, outlet
Spray head；The import spray head, middle part spray head, export spray head model be LY:500-10-100, L:150/750.
The first layer circumferential direction of the scrubbing tower c from the bottom to top is evenly distributed with 6 sets of wash mills；Second and third layer of 2 sets of opposition arrangement is washed
Device, and second and third layer each mutual wrong 90 ° are washed, the 4th layer is equipped with 1 set of wash mill.
Import spray head the model LY:500-10-100, L:150/650 of the scrubbing tower c.
Spray head the model LY:500-10-100, L:150/1070 of the first layer wash mill of the scrubbing tower c.
Spray head the model LY:500-10-150, L:150/1330 of second and third layer of wash mill of the scrubbing tower c.
Spray head the model LY:500-10-150, L:150/1900 of the 4th layer of wash mill of the scrubbing tower c.
The scrubbing tower a is followed, the pump inlet of scrubbing tower b, scrubbing tower c increase 600mm.
Compared with prior art, this method has the following beneficial effects:
The present invention extends the service life of exhaust system, improves vent gas treatment quality, improves device capbility, reaches energy conservation and subtract
The purpose of row, washing tail gas water is by 55~65m3/ h is down to 20~25m3/ h, and exhaust emissions meets the requirements；Reduce washing
Device quantity, wash mill sum statistics is 53 before being down to 24 sets of technological transformation by original 53 sets, not only reduces treating tail gas cost
And maintenance expense, also shorten clearance time.
The present invention solves by improving pump inlet height and washes tower endless tube and spray head blockage problem.
Wash mill, and Venturi scrubber and scrubbing tower is arranged in the middle position of Venturi scrubber in the present invention
A is connected using threeway, is reduced the load of scrubbing tower, is increased the degree of absorption of fluoride.
The present invention is transformed scrubbing tower and offgas duct, increases shower water degree of divergence, improves spraying effect,
And then improve detersive efficiency.
It can be seen that the present invention not only expands device capbility, energy consumption is reduced, also achieves energy-saving and emission-reduction, reduces inspection
Number is repaired, device continuous operating time is extended, reduces operating cost.
Detailed description of the invention
Fig. 1: scrubbing tower a, scrubbing tower b structural schematic diagram (1- scrubbing tower a, 2- scrubbing tower b)；
Fig. 2: the structural schematic diagram of scrubbing tower c；
Fig. 3: scrubbing tower c first layer spray head distributing position figure；
Fig. 4: scrubbing tower c second layer spray head distributing position figure；
Fig. 5: scrubbing tower c third layer spray head distributing position figure；
Fig. 6: scrubbing tower c the 4th layer of spray head distributing position figure；
Fig. 7: washing system figure (the 1- scrubbing tower a of embodiment 1；2- scrubbing tower b；3- scrubbing tower c；4- Venturi scrubber；
5- fluosilicic acid collecting tank；6- water collecting groove；7 liquid drop separators；8- scrubbing tower a circulating pump；9- scrubbing tower b circulating pump；10- tail gas
Blower；11- scrubbing tower c primary cycle pump；12- scrubbing tower c secondary cycle pump；13- Venturi scrubber circulating pump；14- tail gas
From reactive tank and again stock tank；15 washing tail gas water come from outer tube)；
Fig. 8: washing system figure (the 1- scrubbing tower a of comparative example 1；2- scrubbing tower b；3- scrubbing tower c；4- Venturi scrubber；
5- fluosilicic acid collecting tank；6- water collecting groove；7- liquid drop separator；8 scrubbing tower a circulating pumps；9- scrubbing tower b circulating pump；10- tail gas
Blower；11- scrubbing tower c primary cycle pump；12- scrubbing tower c secondary cycle pump；13- tail gas stock tank from reactive tank and again；14-
Washing tail gas water comes from outer tube).
Specific embodiment
Specific embodiments of the present invention will be described in further detail below, but the invention is not limited to these realities
Mode is applied, it is claimed to still fall within the claims in the present invention for any improvement or replacement on the present embodiment essence spirit
Range.
Embodiment 1
A kind of washing system of phosphoric acid extraction tail gas, including Venturi scrubber, the scrubbing tower a, scrubbing tower being sequentially connected
B, scrubbing tower c；The upper tapering of the Venturi scrubber and middle part are respectively equipped with wash mill, Venturi scrubber and washing
Tower a is connected using threeway, and venturi eluting water is sent into fluosilicic acid collecting tank；1 is respectively provided at the scrubbing tower a and scrubbing tower b
A circulating pump is equipped with 2 circulating pumps at scrubbing tower c；
Increase circulating pump, the circulating pump parameter are as follows: Q=305m at the fluosilicic acid collecting tank3/ h, H=53m, motor
Y315S-4, N=110Kw；
The spray head model of the Venturi scrubber are as follows: LY:500-10-150, L:150/750；
The scrubbing tower a, scrubbing tower b are equipped with import spray head, top showerhead, and are washed between outlet equipped with 2 sets by import
Wash device, spray head the model LY:500-10-100, L:150/2000 of every set wash mill；The model of the import spray head
LY:500-10-100, L:150/750；The model LY:600-10-150, L:150/1400 of the top showerhead；
The scrubbing tower a is connect with scrubbing tower b by offgas duct, and the offgas duct is equipped with import spray head, middle part spray head, outlet
Spray head；The import spray head, middle part spray head, export spray head model be LY:500-10-100, L:150/750；
The first layer circumferential direction of the scrubbing tower c from the bottom to top is evenly distributed with 6 sets of wash mills；Second and third layer of 2 sets of opposition arrangement is washed
Device, and second and third layer each mutual wrong 90 ° are washed, the 4th layer is equipped with 1 set of wash mill；
Import spray head the model LY:500-10-100, L:150/650 of the scrubbing tower c；
Spray head the model LY:500-10-100, L:150/1070 of the first layer wash mill of the scrubbing tower c；
Spray head the model LY:500-10-150, L:150/1330 of second and third layer of wash mill of the scrubbing tower c；
Spray head the model LY:500-10-150, L:150/1900 of the 4th layer of wash mill of the scrubbing tower c；
The scrubbing tower a circulating pump, scrubbing tower b circulating pump, scrubbing tower c primary cycle pump, scrubbing tower c secondary cycle pump
Import increases 600mm.
Embodiment 2
The transformation (as shown in Figure 1) of scrubbing tower a, scrubbing tower b are present embodiments provided, the scrubbing tower a, scrubbing tower b are set
There are import spray head, top showerhead, and is equipped with 2 sets of wash mills, the spray head model of every set wash mill between exporting by import
For LY:500-10-100, L:150/2000；The model LY:500-10-100, L:150/750 of the import spray head；The top
The model LY:600-10-150, L:150/1400 of portion's spray head；
The scrubbing tower a is connect with scrubbing tower b by offgas duct, and the offgas duct is equipped with import spray head, middle part spray head, outlet
Spray head；The import spray head, middle part spray head, export spray head model be LY:500-10-100, L:150/750；
Embodiment 3
Present embodiments provide the transformation (as shown in Figure 2) of scrubbing tower c, the first layer ring of the scrubbing tower c from the bottom to top
To uniformly distributed 6 sets of wash mills；Second and third layer opposition 2 sets of wash mill of arrangement, and second and third layer each mutual wrong 90 °, the 4th layer sets
There is 1 set of wash mill；
Import spray head the model LY:500-10-100, L:150/650 of the scrubbing tower c；
Spray head the model LY:500-10-100, L:150/1070 of the first layer wash mill of the scrubbing tower c；
Spray head the model LY:500-10-150, L:150/1330 of second and third layer of wash mill of the scrubbing tower c；
Spray head the model LY:500-10-150, L:150/1900 of the 4th layer of wash mill of the scrubbing tower c；
Fig. 3-Fig. 6 is the distributing position of first, second, third and fourth layer of spray head of scrubbing tower c respectively.
Comparative example 1
This comparative example improves the washing system of phosphoric acid extraction tail gas, after extraction tail gas is introduced into Venturi scrubber washing
Into scrubbing tower a, scrubbing tower b is entered after washing, the tail gas after washed tower b washing is aspirated by blower is sent into scrubbing tower c, is washing
It washs and passes through smoke stack emission after washing again in tower c；
The Venturi scrubber is separately mounted at the top of venturi and scrubbing tower a entrance, and scrubbing tower a, scrubbing tower b are each
There are 2 layers, every layer of annular is evenly distributed with 6 sets of wash mills, and a set of wash mill is respectively arranged at top；Wherein, the second layer and first layer washing fill
Set 30 ° of dislocation；The venturi spray head model are as follows: LY:20-10-664, L:200/750；The scrubbing tower a's and scrubbing tower b
Import spray head model are as follows: LY:500-10-100, L:250/790；The scrubbing tower a and scrubbing tower b top spray head dummy number are as follows: LY:
20-10-433, L:100/650；Spray head model in the scrubbing tower a and scrubbing tower b are as follows: LY:14-10-1433, L:250/820；
The pipeline junction of the scrubbing tower a to the scrubbing tower b have a set of wash mill；
Two circulating pumps are set outside the scrubbing tower c；Scrubbing tower c has 4 layers, and every layer of annular is evenly distributed with 6 sets of wash mills, often
Platform circulating pump respectively supplies two layers of wash mill；The scrubbing tower c import spray head model are as follows: LY:500-10-100, L:150/
650；Spray head model in the scrubbing tower c are as follows: LY:20-10-433, L:150/1070.
Claims (10)
1. a kind of washing system of phosphoric acid extraction tail gas, which is characterized in that including Venturi scrubber, the scrubbing tower being sequentially connected
A, scrubbing tower b, scrubbing tower c；The upper tapering of the Venturi scrubber and middle part are respectively equipped with wash mill, Venturi scrubbing
Device is connect with scrubbing tower a using threeway, and venturi eluting water is sent into fluosilicic acid collecting tank.
2. the washing system of phosphoric acid extraction tail gas as described in claim 1, which is characterized in that increase at the fluosilicic acid collecting tank
Circulating pump, the circulating pump parameter are as follows: Q=305m3/ h, H=53m, motor Y315S-4, N=110Kw.
3. the washing system of phosphoric acid extraction tail gas as described in claim 1, which is characterized in that the spray head of the Venturi scrubber
Model are as follows: LY:500-10-150, L:150/750.
4. the washing system of phosphoric acid extraction tail gas as described in claim 1, which is characterized in that the scrubbing tower a, scrubbing tower b are set
There are import spray head, top showerhead, and is equipped with 2 sets of wash mills, the spray head model of every set wash mill between exporting by import
For LY:500-10-100, L:150/2000；The model LY:500-10-100, L:150/750 of the import spray head；The top
The model LY:600-10-150, L:150/1400 of portion's spray head.
5. the washing system of phosphoric acid extraction tail gas as described in claim 1 or 4, which is characterized in that the scrubbing tower a and scrubbing tower
B is connected by offgas duct, and the offgas duct is equipped with import spray head, middle part spray head, outlet spray head；The import spray head, middle part spray head,
The model for exporting spray head is LY:500-10-100, L:150/750.
6. the washing system of phosphoric acid extraction tail gas as described in claim 1, which is characterized in that the scrubbing tower c is from the bottom to top
First layer circumferential direction is evenly distributed with 6 sets of wash mills；Second and third layer opposition 2 sets of wash mill of arrangement, and second and third layer each mutual wrong 90 °,
4th layer is equipped with 1 set of wash mill.
7. the washing system of phosphoric acid extraction tail gas as claimed in claim 6, which is characterized in that the import spray head of the scrubbing tower c
Model LY:500-10-100, L:150/650.
8. the washing system of phosphoric acid extraction tail gas as claimed in claim 6, which is characterized in that the first layer of the scrubbing tower c is washed
Wash spray head the model LY:500-10-100, L:150/1070 of device.
9. the washing system of phosphoric acid extraction tail gas as claimed in claim 6, which is characterized in that second and third layer of the scrubbing tower c
Spray head the model LY:500-10-150, L:150/1330 of wash mill.
10. the washing system of phosphoric acid extraction tail gas as claimed in claim 6, which is characterized in that the 4th layer of the scrubbing tower c is washed
Wash spray head the model LY:500-10-150, L:150/1900 of device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910575092.9A CN110270197A (en) | 2019-06-28 | 2019-06-28 | A kind of washing system of phosphoric acid extraction tail gas |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910575092.9A CN110270197A (en) | 2019-06-28 | 2019-06-28 | A kind of washing system of phosphoric acid extraction tail gas |
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| CN110270197A true CN110270197A (en) | 2019-09-24 |
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| CN201910575092.9A Pending CN110270197A (en) | 2019-06-28 | 2019-06-28 | A kind of washing system of phosphoric acid extraction tail gas |
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| EP2867274A4 (en) * | 2012-06-29 | 2016-02-10 | INVISTA Technologies S à r l | Gas scrubber and related processes |
| CN205815385U (en) * | 2016-07-15 | 2016-12-21 | 嘉施利（荆州）化肥有限公司 | A kind of phosphoric acid tail gas processing system |
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2019
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| EP2867274A4 (en) * | 2012-06-29 | 2016-02-10 | INVISTA Technologies S à r l | Gas scrubber and related processes |
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Application publication date: 20190924 |