CN101279196A - Double return route absorption tower and method for treating fluorine contained tail gas using double return route absorption tower - Google Patents
Double return route absorption tower and method for treating fluorine contained tail gas using double return route absorption tower Download PDFInfo
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- CN101279196A CN101279196A CNA2008100478338A CN200810047833A CN101279196A CN 101279196 A CN101279196 A CN 101279196A CN A2008100478338 A CNA2008100478338 A CN A2008100478338A CN 200810047833 A CN200810047833 A CN 200810047833A CN 101279196 A CN101279196 A CN 101279196A
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Abstract
The invention relates to a double circuit absorption tower and a method for treating tail gas with fluoride via the double circuit absorption tower. The smoke with fluoride enters a first absorption zone of the absorption tower, then enters a secondary absorption zone for a second time purification via a gas cylinder after being cooled and purified and is discharged into the atmosphere via a chimney arranged at the top of the absorption tower after the mist is removed. The lower section of the tower body is a secondary serum recirculating tank; the middle section is the first absorption zone; the lower part of the middle section is a first-level serum recirculating tank; a spraying device is arranged at the upper part of the first absorption zone; a baffle with the gas cylinder is a secondary absorption zone at the upper section of the tower body; the upper part is provided with the spraying device, a demister and a cleaning device; the chimney is arranged at the top of the absorption tower. The tower combines the original two towers into an absorption tower through arranging an upper and a lower baffle, which similarly realizes the high absorption rate of the two towers; the slaking process of limestone or lime is realized in the serum recirculating tank at the bottom of the tower, which reduces the equipment and saves the investment; at the same time, through controlling the pH value of an absorption serum, the absorption rate of the fluoride is raised on the basis of saving the limestone or the lime.
Description
Technical field
The present invention relates to a kind of method that fluorinated tail gas is handled and the dual-circulation absorption tower of defluorinate, can be used for the defluorinate that contains fluoride tail gas that industries such as metallurgy, chemical industry produce; The invention still further relates to the method for utilizing this dual-circulation absorption tower that fluorinated tail gas is handled.
Background technology
Fluoro-gas such as hydrogen fluoride, ocratation is very big to the harm of human body and environment, the harm of fluorine mainly shows as the influence of farming and animal husbandry and people's influence: fluorine makes the concentration of hazard of plant only be equivalent to 1% of sulfur dioxide, but plant is very big to the sensitiveness difference of fluorine, plant is after absorbing, putting aside fluorine, leaf tip and edge are withered and yellow to wither, crops depauperation when serious, the underproduction is in poor harvest.Ox is the most responsive to fluorine in the domestic animal, and serious fluorine poisoning can cause bone infringement distortion, fracture, bradymassesis so that become thin, death.Endemic fluorosis is caused by geological environment, causes fluorosis of bone, dental plaque disease as fluorine-containing height in the water.The industry fluorine poisoning is then mainly caused by waste gas containing fluoride or waste water.Fluorine and compound thereof can enter human body by respiratory tract, alimentary canal, skin, and the mucous membrane of the exciting eye and the upper respiratory tract causes inflammation and allergy etc.The fluorine of taking in 99% is deposited in human skeleton and the tooth, and these fluorine are drained slowly, and generates calcirm-fluoride with calcium in the body, and blood calcium is reduced, and metabolic disorder causes " dental plaque disease " and " fluorosis of bone "; Children's tooth is more responsive to fluorine, and is influenced bigger.
At present, the absorption process of fluoro-gas is mainly contained the branch of wet method, dry method both at home and abroad.
Dry cleaning is exactly to utilize solid absorbent to adsorb certain gaseous matter and finish the purpose that purifies flue gas with absorbing, and adsorbent mainly contains metal oxide (as Al
2O
3), lime stone, lime.Key reaction equipment is reaction bed, and reaction bed is divided three classes: fixed bed, fluid bed is carried bed.
Dry cleaning mainly has efficient height, non-secondary pollution, simple to operate, characteristics that operating cost is low, and is the most extensive in the aluminium metallurgy sector application.
Wet cleaning is to utilize water or alkaline solution to make absorbent to absorb fluoro-gas in the flue gas with absorbing, absorbent mainly contains water, soda lye, milk of lime, ammoniacal liquor etc., wherein lime stone or lime is carried out wet-treating as absorbent to fluorinated tail gas and answers land used more extensive.
General fluorine-containing industrial tail gas mainly contains hydrogen fluoride, ocratation etc., and is water-soluble all fine, so the wet absorption process is exactly material is changed over to liquid phase by gas phase a mass transport process.The absorption equipment more widely that uses is mainly spray void tower, tubulent contact tower, packed tower, plate column etc.
The spray void tower mainly is made up of slurry vessel, spray equipment and demister.Its purification efficiency defluorination can reach about 85%.Though volume is bigger, power consumption, water consumption is higher, and technology, equipment are simple, and resistance is little, is difficult for stopping up, and is most widely used in wet-treating tail gas field.
But because fluorine gas is very big to environment and human body harm, emission request is very strict, and its exhaust emissions concentration is lower than 1/10 of sulphur emissions concentration.Generally fluorinated tail gas is carried out wet-treating and all will pass through the multistage absorption of multitower, investment is big, take up an area of greatly, and complex process, energy consumption is higher.
Summary of the invention
The purpose of this invention is to provide a kind of dual-circulation absorption tower, another object of the present invention provides personal dual-circulation absorption tower carries out wet-treating to fluorinated tail gas in chemical industry, metallurgical project method.
The object of the present invention is achieved like this: a kind of dual-circulation absorption tower, comprise tower body, tower body top is provided with chimney, tower body is divided into three sections of upper, middle and lowers, the stage casing and between hypomere be provided with lower clapboard, be provided with the upper spacer that has gas cylinder between epimere and the stage casing, there is baffle plate on the gas cylinder top, the tower body hypomere is provided with inlet, following pars infrasegmentalis is secondary slurries circulating slots, the stage casing of tower body forms one-level slurries circulating slot by lower clapboard, and one-level slurries circulating slot sidewall has leakage fluid dram, and gas approach communicates with the stage casing of tower body, be provided with spray equipment in the tower body stage casing No. one time, be provided with the secondary spraying device in the tower body epimere, liquid outlet is arranged on the upper spacer, secondary spraying device top is provided with demister and demister cleaning device.
Inlet is communicated with pipeline with liquid outlet, makes the epimere sprayed slurry flow into hypomere secondary slurries circulating slot by pipeline.
Demister is selected baffle type mist eliminator or the board-like demister of eddy flow for use.
Upper spacer and lower clapboard tilt 3 °-10 ° with respect to horizontal direction.
The method of utilizing the described dual-circulation absorption tower of claim 1 that fluorinated tail gas is handled,
A. fluorine-containing tail gas enters a uptake zone in tower body stage casing by the gas approach road, with the reaction of one-level loop slurry and by the cooling dedusting, the flue gas of preliminary purification rises and enters the secondary uptake zone of tower body epimere through the gas cylinder on the upper spacer, with secondary loop slurry reaction to remove residual fluoro-gas, the tail gas that is wrapped in drop continue to rise the back by after the demister demist from inhaling the smoke stack emission at body top;
B. the demister rinse water is mixed the back because the space that the baffle effect on the gas cylinder top on the upper spacer falls between gas cylinder forms hydrops with the secondary cycle slurries at the tower epimere, and hydrops is introduced in the secondary slurries circulating slot of tower body hypomere by pipeline;
C. lime stone or lime powder are added in the secondary slurries circulating slot of tower body hypomere continuously, by the slurries in the secondary slurries circulating slot are carried out aeration agitation, promote the slake process, replenish fresh absorption slurries;
D. the secondary loop slurry hydrops between the gas cylinder in the upper spacer is partly by the uptake zone of gas cylinder nozzle overflow to the tower body stage casing, fall into the one-level slurries circulating slot that is formed by lower clapboard, part one-level loop slurry is discharged from leakage fluid dram and is carried out the waste water integrated treatment to keep the activity and the liquid level of one-level loop slurry.
One-level loop slurry pH value remains on 3-7, is faintly acid; Secondary loop slurry pH value remains on 8-13, is alkalescence.
Lime stone or lime powder send by wind and add in the secondary slurries circulating slot, carry out the slake process in secondary slurries circulating slot groove.
Use compressed air or roots blower that the secondary loop slurry is stirred.
Demister is cleaned by the demist cleaning device, and the Clean after every time is 15-30 minute, washes 1-5 minute at every turn.
Dual-circulation absorption tower provided by the invention, by being provided with lower clapboard, with an absorption tower of double tower merging becoming originally, but still realized the high-absorbility that double tower absorbs, simultaneously chimney is stood on cat head, in tower prime cement liquid circulating slot, realize lime stone or lime slake process, reduced equipment, saved the floor space of absorption system and the investment of chimney stack; Absorb the different pH value of slurries by control simultaneously, on the basis of saving lime stone or lime, improve the absorptivity of fluoride.
The flue gas of carrying drop secretly enters demister after defluorinate is handled, carry out under the situation of deviation at deflection plate or eddy flow plate flow line, under the drop in certain particle size range is captured by the demister blade under effect of inertia.The deflection plate demister has demist efficient height, is convenient to clean the characteristics that resistance drop is little.
Upper spacer and lower clapboard are provided with the inclination angle, and the precipitation that makes generation is along with the base plate that tilts flows out by liquid outlet and leakage fluid dram respectively, and the insoluble matter in the loop slurry is not easy in bottom deposit, reduces and stirs required equipment and energy consumption.
Lime stone or lime powder send by wind and are blown in the secondary slurries circulating slot, constantly stir down by fluid and the bottom land compressed air that flows fast in the secondary slurries circulating slot, lime stone or lime can carry out slake apace in groove, finish the preparation of absorbent, reduce slaking tank, saved investment.
Description of drawings:
Fig. 1 is a dual-circulation absorption tower structural representation of the present invention.
The specific embodiment
The dual-circulation absorption tower that provides of the present invention can absorb fluoro-gas such as hydrogen fluoride, ocratation, adopts
4.0 * 40.0 meters combined type absorption tower, wherein tower body 1 is
4.0 * 24.0 meters, chimney 14 is
1.6 * 16.0 meters.Tower body 1 shell is a carbon steel, by upper spacer 5 and lower clapboard 2 be divided into down, in, last three sections.Hypomere is a secondary recycle slurry liquid bath 11, and the stage casing is a uptake zone, and epimere is the secondary uptake zone and removes the fog-zone.Above the tower body bottom at secondary slurries circulating slot 11 places is the lower clapboard 2 of complete closed, inlet 8 is located at 12 corresponding tower walls of one-level slurries circulating slot middle part, form one-level slurries circulating slot 12 on the lower clapboard 2, the top is gas approach 4 and one-level spray equipment 3, one-level spray equipment 3 tops are upper spacer 5 and the liquid outlets 7 that have a plurality of gas cylinders 6, baffle plate 16 is arranged at gas cylinder 6 tops, 6 mouthfuls of tops of gas cylinder are secondary spray equipment 3, demister 9 and demister cleaning device 10, and cat head is a chimney 14.
Absorbing used raw material in process of production is lime stone or lime powder, requires-200 orders＞90%, adding be the 105%-120% of theoretical consumption;
Directly be discharged into the ground hopper by truck, send in the lime powder bin through bucket elevator, by star-like dispenser control Shi Hui Fen Give material speed, fall into conveying worm secondary slurries circulating slot 11 at the bottom of wind is fed into tower, quick slake under the liquid slurry that in acid tank, flows fast and the situation of compressed air aeration.
The fresh absorbent that forms is mixed the back rapidly with secondary slurries circulating slot 11 interior slurries and is squeezed into secondary uptake zone, absorption tower by slurry circulating pump, eject by spray equipment 3, the droplet that forms carries out sufficient heat and mass transport with from bottom to top gas on the drop surface in the process of landing, absorb fluoro-gas, the product CaF of reaction
2, CaSiF
6And the intact Ca (OH) of unreacted
2Drop, the cleaning fluid 10 that captures with top demister 9 falls into the gap of 6 of gas cylinders, forms hydrops.Because upper spacer 5 and lower clapboard 2 have 3 °-10 ° inclination angle with respect to horizontal direction, most of hydrops flows out by the liquid outlet 7 of tower body sidewall on the upper spacer 5, secondary slurries circulating slot 11 at the bottom of pipeline flows into tower, small part hydrops are gone into the one-level slurries circulating slot 12 of bottom, a uptake zone by gas cylinder 6 overflows.Use compressed air or roots blower that the secondary loop slurry is stirred.The one-level slurries are squeezed into the spray equipment 3 in the uptake zone one time by slurry circulating pump, the droplet that forms makes into, and tower flue gas cools off rapidly, and fluoro-gas tentatively absorbed, the insoluble matter of formation is discharged by the leakage fluid dram 13 of lower clapboard 5 upper column body sidewalls and is precipitated and circular treatment.
One-level loop slurry and secondary loop slurry all are lime stone slurry or milk of lime slurries, and they are two kinds of absorbents, and the solubility in water is all very low, all is the slurries that contain the more amount insoluble matter.Fresh limestone slurries or milk of lime slurries are alkalescence, directly add it in secondary loop slurry, make the secondary loop slurry keep certain alkalescence, pH value remains on 8-13, in the secondary loop slurry after absorbing through secondary the absorbent of some be consumed, enter the one-level loop slurry by gas cylinder 6 again and once absorb, the absorbent in the one-level loop slurry is approaching like this runs out of, institute thinks faintly acid, and pH value remains on 3-7.Control the acid-base value of loop slurry by 13 amounts that efflux to additional absorption liquid of one-level loop slurry and one-level loop slurry by the secondary loop slurry.
The baffle plate 16 that gas cylinder 6 tops are provided with is to prevent that spray liquid from directly dropping into midsection from gas cylinder 6.
Smoking gas containing fluorine through once absorb absorb with secondary after, tail gas enters two-stage demister 9 to remove the water smoke of deentrainment, demister 9 is selected baffle type mist eliminator or the board-like demister of eddy flow for use.
Chimney 14 dischargings of tail gas after the purification through absorbing cat head.
Every grade of demister in two-stage demister district all has spraying-cleaning device 10 up and down, automatically demister is carried out jet douche once in per 15 minutes, continues 2 minutes at every turn, to guarantee the cleaning of demister.
Because intake air temperature is higher, under the tower body, that the stage casing adopts the mode of liner graphite cake to carry out is anticorrosion, descend through flue-gas temperature behind spraying cooling, the mode of epimere and above employing line with rubber is anticorrosion.
Adopt this kind absorption tower not only to save land area, reduced the chimney cost of equipment manufacturing cost and 25-30 rice, in actual applications, also reached the effect of fluorine absorptivity 99.2%, make the concentration of discharging fluorine in the tail gas reach discharge standard.Adopt the two-stage circulated sprinkling to absorb, reduced the slurries internal circulating load of system, energy consumption reduces about 10%.
Claims (9)
1, a kind of dual-circulation absorption tower, comprise tower body (1), tower body (1) top is provided with chimney (14), it is characterized in that: tower body (1) is divided into three sections of upper, middle and lowers, the stage casing and between hypomere be provided with lower clapboard (2), be provided with the upper spacer (5) that has gas cylinder (6) between epimere and the stage casing, there is baffle plate (16) on gas cylinder (6) top, tower body (1) hypomere is provided with inlet (8), following pars infrasegmentalis is a secondary slurries circulating slot (11), the stage casing of tower body (1) forms one-level slurries circulating slot (12) by lower clapboard (2), one-level slurries circulating slot (12) sidewall has leakage fluid dram (13), gas approach (4) communicates with the stage casing of tower body (1), tower body (1) is provided with a spray equipment (15) in the stage casing, be provided with secondary spraying device (3) in tower body (1) epimere, liquid outlet (7) is arranged on the upper spacer (5), secondary spraying device (3) top is provided with demister (9) and demister cleaning device (10).
2, dual-circulation absorption tower according to claim 1 is characterized in that: inlet (8) is communicated with pipeline with liquid outlet (7), makes the epimere sprayed slurry flow into hypomere secondary slurries circulating slots (12) by pipeline.
3, dual-circulation absorption tower according to claim 1 is characterized in that: demister (9) is selected baffle type mist eliminator or the board-like demister of eddy flow for use.
4, dual-circulation absorption tower according to claim 1 is characterized in that: upper spacer (5) and lower clapboard (2) tilt 3 °-10 ° with respect to horizontal direction.
5, a kind of method of utilizing the described dual-circulation absorption tower of claim 1 that fluorinated tail gas is handled is characterized in that:
A. fluorine-containing tail gas enters a uptake zone in tower body (1) stage casing by gas approach (4) road, with the reaction of one-level loop slurry and by the cooling dedusting, the flue gas of preliminary purification rises and enters the secondary uptake zone of tower body (1) epimere through the gas cylinder (6) on the upper spacer (5), react to remove residual fluoro-gas with the secondary loop slurry, discharge by the chimney (14) from suction body (1) top after demister (9) demist tail gas continuation rising back that is wrapped in drop;
B. demister (9) rinse water is mixed the back because the space that the baffle effect on gas cylinder (6) top on the upper spacer (5) falls between gas cylinder (6) forms hydrops with the secondary cycle slurries at the tower epimere, and hydrops is introduced in the secondary slurries circulating slot (11) of tower body (1) hypomere by pipeline;
C. lime stone or lime powder are added in the secondary slurries circulating slot (11) of tower body (1) hypomere continuously, by the slurries in the secondary slurries circulating slot (11) are carried out aeration agitation, promote the slake process, replenish fresh absorption slurries;
D. the secondary loop slurry hydrops between the gas cylinder (6) in the upper spacer (5) is partly by the uptake zone of gas cylinder nozzle overflow to tower body (1) stage casing, fall into the one-level slurries circulating slot (12) that forms every (2) plate by down, part one-level loop slurry is discharged from leakage fluid dram (13) and is carried out the waste water integrated treatment to keep the activity and the liquid level of one-level loop slurry.
6, the method for utilizing dual-circulation absorption tower that fluorinated tail gas is handled according to claim 5 is characterized in that: one-level loop slurry pH value remains on 3-7, is faintly acid; Secondary loop slurry pH value remains on 8-13, is alkalescence.
7, the method for utilizing dual-circulation absorption tower that fluorinated tail gas is handled according to claim 5, it is characterized in that: lime stone or lime powder send by wind and add in the secondary slurries circulating slots (11), carry out the slake process in secondary slurries circulating slot (11) groove.
8, the method that fluorinated tail gas is handled according to claim 5 is characterized in that: use compressed air or roots blower that the secondary loop slurry is stirred.
9, the method that fluorinated tail gas is handled according to claim 5 is characterized in that: demister (9) is cleaned by demist cleaning device (10), and the Clean after every time is 15-30 minute, washes 1-5 minute at every turn.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100478338A CN101279196A (en) | 2008-05-27 | 2008-05-27 | Double return route absorption tower and method for treating fluorine contained tail gas using double return route absorption tower |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100478338A CN101279196A (en) | 2008-05-27 | 2008-05-27 | Double return route absorption tower and method for treating fluorine contained tail gas using double return route absorption tower |
Publications (1)
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|---|---|
| CN101279196A true CN101279196A (en) | 2008-10-08 |
Family
ID=40011979
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|---|---|---|---|
| CNA2008100478338A Pending CN101279196A (en) | 2008-05-27 | 2008-05-27 | Double return route absorption tower and method for treating fluorine contained tail gas using double return route absorption tower |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101530720B (en) * | 2009-03-16 | 2011-01-05 | 宜兴市展宏环保设备有限公司 | Acid fog absorption tower |
| CN102641660A (en) * | 2012-05-09 | 2012-08-22 | 四川省川宏精细化工有限公司 | Recycling method of fluorine in fluorophlogopite process gas |
| CN103357252A (en) * | 2013-07-31 | 2013-10-23 | 山东博丰利众化工有限公司 | Gypsum tail gas processing device |
| CN107940492A (en) * | 2017-12-07 | 2018-04-20 | 天津华赛尔传热设备有限公司 | A kind of white absorption tower that disappears of heating agent circulation |
| CN110102171A (en) * | 2019-04-26 | 2019-08-09 | 核工业北京化工冶金研究院 | A kind of lepidolite ore pretreatment device for absorbing tail gas and method |
| CN110327758A (en) * | 2019-07-09 | 2019-10-15 | 云南锡业股份有限公司冶炼分公司 | A kind of tin smelts smoking gas containing fluorine treatment process and device |
| CN110604983A (en) * | 2018-06-15 | 2019-12-24 | 安徽省宁国市宁星耐磨材料有限公司 | Steel casting waste gas cleaning system |
| CN111659237A (en) * | 2020-06-16 | 2020-09-15 | 王波 | Energy-saving environment-friendly integrated flue gas purification and dust removal device and method thereof |
| CN116651157A (en) * | 2023-08-01 | 2023-08-29 | 张掖市三益化工外贸有限公司 | Tail gas integrated treatment equipment for high-purity aluminum fluoride production |
-
2008
- 2008-05-27 CN CNA2008100478338A patent/CN101279196A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101530720B (en) * | 2009-03-16 | 2011-01-05 | 宜兴市展宏环保设备有限公司 | Acid fog absorption tower |
| CN102641660A (en) * | 2012-05-09 | 2012-08-22 | 四川省川宏精细化工有限公司 | Recycling method of fluorine in fluorophlogopite process gas |
| CN102641660B (en) * | 2012-05-09 | 2014-09-03 | 四川省川宏精细化工有限公司 | Recycling method of fluorine in fluorophlogopite process gas |
| CN103357252A (en) * | 2013-07-31 | 2013-10-23 | 山东博丰利众化工有限公司 | Gypsum tail gas processing device |
| CN103357252B (en) * | 2013-07-31 | 2016-04-06 | 山东博丰利众化工有限公司 | Gypsum exhaust gas processing device |
| CN107940492A (en) * | 2017-12-07 | 2018-04-20 | 天津华赛尔传热设备有限公司 | A kind of white absorption tower that disappears of heating agent circulation |
| CN110604983A (en) * | 2018-06-15 | 2019-12-24 | 安徽省宁国市宁星耐磨材料有限公司 | Steel casting waste gas cleaning system |
| CN110102171A (en) * | 2019-04-26 | 2019-08-09 | 核工业北京化工冶金研究院 | A kind of lepidolite ore pretreatment device for absorbing tail gas and method |
| CN110327758A (en) * | 2019-07-09 | 2019-10-15 | 云南锡业股份有限公司冶炼分公司 | A kind of tin smelts smoking gas containing fluorine treatment process and device |
| CN111659237A (en) * | 2020-06-16 | 2020-09-15 | 王波 | Energy-saving environment-friendly integrated flue gas purification and dust removal device and method thereof |
| CN116651157A (en) * | 2023-08-01 | 2023-08-29 | 张掖市三益化工外贸有限公司 | Tail gas integrated treatment equipment for high-purity aluminum fluoride production |
| CN116651157B (en) * | 2023-08-01 | 2023-12-01 | 张掖市三益化工外贸有限公司 | Tail gas integrated treatment equipment for high-purity aluminum fluoride production |
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Open date: 20081008 |