CN1471997A - Washing method and apparatus for phosphoric acid reacting trough extracting tail gas - Google Patents
Washing method and apparatus for phosphoric acid reacting trough extracting tail gas Download PDFInfo
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- CN1471997A CN1471997A CNA03131936XA CN03131936A CN1471997A CN 1471997 A CN1471997 A CN 1471997A CN A03131936X A CNA03131936X A CN A03131936XA CN 03131936 A CN03131936 A CN 03131936A CN 1471997 A CN1471997 A CN 1471997A
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- tail gas
- washing
- tower
- washing tower
- phosphoric acid
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Abstract
A method for washing the extractable tail gas of phosphoric acid reactor features that a venturi washer and two shower-cyclone washing towers are searially arranged and under the action of external circulating pumps, said tail gas is serially washed. Its advantages are no discharge of sewage, and high effect to remove F from tail gas (9 mg/cu.m).
Description
Technical field
The present invention relates to a kind of gas scrubbing technology, relate to wash with water the method and the equipment thereof of phosphoric acid reaction tank extraction tail gas more specifically.
Background technology
Wet-process Phosphoric Acid Production is finished with mineral acid (mainly being sulfuric acid) decomposing phosphate rock.When extractive reaction, the fluorine that is the gaseous state effusion accounts for the 5-10%wt of phosphorus ore fluorine content, and it remains in phosphogypsum and the dilute phosphoric acid.
The fluorine that extractive reaction is discharged is mainly with silicon tetrafluoride SiF
4Form exists.It is relevant that expellant gas amount and reaction heat remove mode, if adopt air cooling, the expellant gas amount is big, adopts vacuum cooling, and the expellant gas amount is little.Big or little of expellant gas amount is relevant with the washing plant size, and is irrelevant with washing flow.
The washing methods of fluorinated tail gas is a lot, and ultimate principle is roughly the same, the kind of the device type that different is is adopted, progression, absorption liquid.The type of absorption equipment mainly contains the impact type washer, sprays spray cup resorber, turbulent contact absorber, Venturi scrubber and horizontal cross-flow spray scrubber etc.But present washing tail gas technology is the equipment complexity often, Operation and maintenance cost height, and the process water amount is big, and the fluorine detersive efficiency is low, and sewage discharge is arranged, and does not meet environmental requirement.
Summary of the invention
The object of the present invention is to provide a kind of method and equipment thereof that washes phosphoric acid reaction tank extraction tail gas with water, extraction tail gas meets the environment protection emission requirement, and accomplishes without sewage discharge through after repeatedly washing.
Technical scheme of the present invention is:
A kind of washing methods of phosphoric acid reaction tank extraction tail gas, it is characterized in that being to use recirculated water, extraction tail gas is at first carried out Venturi-type washing, spray the reverse-flow combination washing of whirlwind void tower then after, washings is delivered to the phosphoric acid filtering system as filter cake washing water.
A Venturi scrubber and two spray whirlwind tail gas washing towers are set in washing flow, extraction tail gas is earlier through after the Venturi scrubber water washing, gas-liquid mixture enters the one-level tail gas washing tower, utilize the washing of tower outer circulation pump circulated sprinkling, gas after the washing enters the secondary tail gas washing tower by exhaust fan, utilize the washing of tower outer circulation pump circulated sprinkling, tail gas after the process washing is to environmental emission, the washings overflow of secondary tail gas washing tower is to the one-level tail gas washing tower, to secondary tail gas washing tower replenishment cycles water, the washings of one-level tail gas washing tower is constantly delivered to filtering system as the filtering filter cake wash water of phosphoric acid.
Venturi scrubber liquid/gas ratio is 1/1000～1.2/1000m
3Liquid/m
3It is 40～60m/s that gas, trunnion gas velocity are controlled at, the specific liquid rate 15～20m of spray whirlwind washing tower
3/ m
2H.
Washing replenishment cycles water is to use the fluorine-containing recirculated water at self-circulating water station.
A kind of washing plant of phosphoric acid reaction tank extraction tail gas is characterized in that comprising Venturi scrubber, two-stage spray whirlwind tail gas washing tower and recycle pump thereof, and exhaust fan and tail gas funnel, and reclaim water pump.
Spray whirlwind tail gas washing tower is equipped with tower outer circulation pump outward, there is upflow tube to lead to the one-level tail gas washing tower on the secondary tail gas washing tower, be connected with circulating water inlet on the secondary tail gas washing tower, between one-level tail gas washing tower and the secondary tail gas washing tower exhaust fan is installed, the one-level tail gas washing tower is connected with the recovery water pump, Venturi scrubber and one-level tail gas washing tower are communicated with, and Venturi scrubber also is communicated with the tower outer circulation pump of one-level tail gas washing tower.
Advantage of the present invention is:
1, the production equipment that adopts the present invention to build, its processing unit is few, and equipment is easily made, and device is arranged compact, and operation and maintenance costs is low.
2, use fluorine-containing recirculated water liquid as a supplement, reduce the process water consumption, improve the water quality of recirculated water.
3, washings tower outer circulation reduces the washings quantity discharged, and the washings of discharging is recycled, and accomplishes without sewage discharge.
4, fluorine detersive efficiency height, fluorine-containing in the discharging tail gas less than 9mg/m
3
Description of drawings
Accompanying drawing is a process flow diagram of the present invention
Embodiment
Example 1
Adopt 60,000 tons of/year P of the present invention
2O
5The phosphoric acid extraction device
Referring to accompanying drawing.Extraction tail gas is by Venturi scrubber 1, one-level tail gas washing tower 2, exhaust fan 4, the combination process of secondary tail gas washing tower 3 washs, the one-level tail gas washing tower is equipped with one-level washing tail gas recycle pump 5 outward, the secondary tail gas washing tower is equipped with secondary washing tail gas recycle pump 6 outward, there is upflow tube 9 to lead to one-level tail gas washing tower 2 on the secondary tail gas washing tower 3, be connected with circulating water inlet on the secondary tail gas washing tower 3, between one-level tail gas washing tower 2 and the secondary tail gas washing tower 3 exhaust fan 4 is installed, one-level tail gas washing tower 2 is connected with and reclaims water pump 7, be used to take away washings to filtering system, Venturi scrubber 1 and one-level tail gas washing tower 2 are communicated with.Tail gas after the washing passes through tail gas funnel 8 to environment emptying.The Venturi scrubber liquid/gas is than being 1/1000m
3Liquid/m
3Gas, trunnion gas velocity are controlled at and are 50m/s, the specific liquid rate 18.8m of washing tower
3/ (m
2H), empty tower gas velocity 3.9m/s absorbs 7.4 meters of height.
Technological process of the present invention is: extraction tail gas is earlier through after 1 water washings of Venturi scrubber, gas-liquid mixture enters one-level tail gas washing tower 2, utilize the washing of tower outer circulation pump 5 circulated sprinklings, gas after the washing advances 2 secondary tail gas washing towers 3 by exhaust fan 4, utilize the washing of tower outer circulation pump 6 circulated sprinklings, tail gas after the process washing is to environmental emission, the washings overflow of secondary tail gas washing tower 3 is to one-level tail gas washing tower 2, to secondary tail gas washing tower 3 replenishment cycles water, the washings of one-level tail gas washing tower 2 is constantly delivered to filtration system filters, and filtered liquid adds secondary tail gas washing tower replenishment cycles water to be used.
Example 2
Adopt 120,000 tons of/year P of the present invention
2O
5The phosphoric acid extraction device
Referring to accompanying drawing.Extraction tail gas washs by the combination process of Venturi scrubber 1, one-level tail gas washing tower 2, exhaust fan 4, secondary tail gas washing tower 3.The Venturi scrubber liquid/gas is than being 1/1000m
3Liquid/m
3Gas, trunnion gas velocity are controlled at and are 51m/s, the specific liquid rate 15m of washing tower
3/ (m
2H), empty tower gas velocity 3.8m/s absorbs 7.8 meters of height.All the other are with example 1.
Claims (6)
1. the washing methods of phosphoric acid reaction tank extraction tail gas, it is characterized in that being to use recirculated water, extraction tail gas is at first carried out Venturi-type washing, spray the reverse-flow combination washing of whirlwind void tower then after, washings is delivered to the phosphoric acid filtering system as filter cake washing water.
2. the washing methods of phosphoric acid reaction tank extraction tail gas according to claim 1, it is characterized in that in washing flow, being provided with a Venturi scrubber and two spray whirlwind tail gas washing towers, extraction tail gas is earlier through after the Venturi scrubber water washing, gas-liquid mixture enters the one-level tail gas washing tower, utilize the washing of tower outer circulation pump circulated sprinkling, gas after the washing enters the secondary tail gas washing tower by exhaust fan, utilize the washing of tower outer circulation pump circulated sprinkling, tail gas after the process washing is to environmental emission, the washings overflow of secondary tail gas washing tower is to the one-level tail gas washing tower, to secondary tail gas washing tower replenishment cycles water, the washings of one-level tail gas washing tower is constantly delivered to filtering system as the filtering filter cake wash water of phosphoric acid.
3. the washing methods of phosphoric acid reaction tank extraction tail gas according to claim 1 is characterized in that Venturi scrubber liquid/gas ratio is 1/1000～1.2/1000m
3Liquid/m
3It is 40～60m/s that gas, trunnion gas velocity are controlled at, the specific liquid rate 15～20m of spray whirlwind washing tower
3/ m
2H.
4. the washing methods of phosphoric acid reaction tank extraction tail gas according to claim 1 is characterized in that washing the fluorine-containing recirculated water that replenishment cycles water is to use the self-circulating water station.
5. the washing plant of a phosphoric acid reaction tank extraction tail gas is characterized in that comprising Venturi scrubber, two-stage spray whirlwind tail gas washing tower and recycle pump thereof, and exhaust fan and tail gas funnel, and reclaim water pump.
6. the washing plant of phosphoric acid reaction tank extraction tail gas according to claim 5, it is characterized in that spraying the whirlwind tail gas washing tower tower outer circulation pump is installed outward, there is upflow tube to lead to the one-level tail gas washing tower on the secondary tail gas washing tower, be connected with circulating water inlet on the secondary tail gas washing tower, between one-level tail gas washing tower and the secondary tail gas washing tower exhaust fan is installed, the one-level tail gas washing tower is connected with the recovery water pump, Venturi scrubber and one-level tail gas washing tower are communicated with, and Venturi scrubber also is communicated with the tower outer circulation pump of one-level tail gas washing tower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA03131936XA CN1471997A (en) | 2003-06-17 | 2003-06-17 | Washing method and apparatus for phosphoric acid reacting trough extracting tail gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA03131936XA CN1471997A (en) | 2003-06-17 | 2003-06-17 | Washing method and apparatus for phosphoric acid reacting trough extracting tail gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1471997A true CN1471997A (en) | 2004-02-04 |
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ID=34153920
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA03131936XA Pending CN1471997A (en) | 2003-06-17 | 2003-06-17 | Washing method and apparatus for phosphoric acid reacting trough extracting tail gas |
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|---|---|
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102205952A (en) * | 2011-04-12 | 2011-10-05 | 郴州市金龙铁合金有限公司 | Process for recovering phosphoric acid in flue gas generated in process of smelting ferro phosphorus in electric furnace |
| CN102258929A (en) * | 2011-05-19 | 2011-11-30 | 武汉市中东化工有限公司 | Method for recycling phosphoric acid-produced exhaust |
| CN102381785A (en) * | 2011-10-20 | 2012-03-21 | 瓮福（集团）有限责任公司 | Method for recovering waste water containing phosphorus |
| CN101721890B (en) * | 2009-12-20 | 2013-03-27 | 芜湖新兴铸管有限责任公司 | Tail gas collection system for tar and crude benzene |
| CN103446968A (en) * | 2012-12-21 | 2013-12-18 | 南通醋酸化工股份有限公司 | Production method for continuous bubble tower absorption of polysorbate |
| CN103497009A (en) * | 2013-08-28 | 2014-01-08 | 中盐安徽红四方股份有限公司 | New method for continuously preparing dilute sulfuric acid in ammonia acid compound fertilizer production |
| CN106215629A (en) * | 2016-08-31 | 2016-12-14 | 贵州开磷集团股份有限公司 | The washing methods of a kind of phosphoric acid extraction tail gas and device |
| CN106731605A (en) * | 2016-12-29 | 2017-05-31 | 临沂圣大环保工程有限公司 | Nitrate method phosphoric acid plant vent gas from reaction tank processing unit and method |
| CN107158918A (en) * | 2017-07-10 | 2017-09-15 | 临沂圣大环保工程有限公司 | A kind of nitrate method phosphoric acid tail gas defluorinate denitration process system and processing method |
| CN107185379A (en) * | 2017-07-10 | 2017-09-22 | 临沂圣大环保工程有限公司 | A kind of phosphoric acid by wet process tail gas Two-way Cycle defluorinate processing system and processing method |
| CN114984728A (en) * | 2022-06-21 | 2022-09-02 | 云南磷化集团有限公司 | Wet-process phosphoric acid extraction tank tail gas treatment system and method |
-
2003
- 2003-06-17 CN CNA03131936XA patent/CN1471997A/en active Pending
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101721890B (en) * | 2009-12-20 | 2013-03-27 | 芜湖新兴铸管有限责任公司 | Tail gas collection system for tar and crude benzene |
| CN102205952B (en) * | 2011-04-12 | 2013-01-02 | 郴州市金龙铁合金有限公司 | Process for recovering phosphoric acid in flue gas generated in process of smelting ferro phosphorus in electric furnace |
| CN102205952A (en) * | 2011-04-12 | 2011-10-05 | 郴州市金龙铁合金有限公司 | Process for recovering phosphoric acid in flue gas generated in process of smelting ferro phosphorus in electric furnace |
| CN102258929A (en) * | 2011-05-19 | 2011-11-30 | 武汉市中东化工有限公司 | Method for recycling phosphoric acid-produced exhaust |
| CN102381785A (en) * | 2011-10-20 | 2012-03-21 | 瓮福（集团）有限责任公司 | Method for recovering waste water containing phosphorus |
| CN103446968B (en) * | 2012-12-21 | 2015-11-25 | 南通醋酸化工股份有限公司 | The production method that sorbic acid polyester continuous bubbling tower absorbs |
| CN103446968A (en) * | 2012-12-21 | 2013-12-18 | 南通醋酸化工股份有限公司 | Production method for continuous bubble tower absorption of polysorbate |
| CN103497009A (en) * | 2013-08-28 | 2014-01-08 | 中盐安徽红四方股份有限公司 | New method for continuously preparing dilute sulfuric acid in ammonia acid compound fertilizer production |
| CN106215629A (en) * | 2016-08-31 | 2016-12-14 | 贵州开磷集团股份有限公司 | The washing methods of a kind of phosphoric acid extraction tail gas and device |
| CN106731605A (en) * | 2016-12-29 | 2017-05-31 | 临沂圣大环保工程有限公司 | Nitrate method phosphoric acid plant vent gas from reaction tank processing unit and method |
| CN107158918A (en) * | 2017-07-10 | 2017-09-15 | 临沂圣大环保工程有限公司 | A kind of nitrate method phosphoric acid tail gas defluorinate denitration process system and processing method |
| CN107185379A (en) * | 2017-07-10 | 2017-09-22 | 临沂圣大环保工程有限公司 | A kind of phosphoric acid by wet process tail gas Two-way Cycle defluorinate processing system and processing method |
| CN114984728A (en) * | 2022-06-21 | 2022-09-02 | 云南磷化集团有限公司 | Wet-process phosphoric acid extraction tank tail gas treatment system and method |
| CN114984728B (en) * | 2022-06-21 | 2024-03-15 | 云南磷化集团有限公司 | Wet phosphoric acid extraction tank tail gas treatment system and method thereof |
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